contrib/unbound/services/authzone.c

   1 /*
   2  * services/authzone.c - authoritative zone that is locally hosted.
   3  *
   4  * Copyright (c) 2017, NLnet Labs. All rights reserved.
   5  *
   6  * This software is open source.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  15  * Redistributions in binary form must reproduce the above copyright notice,
  16  * this list of conditions and the following disclaimer in the documentation
  17  * and/or other materials provided with the distribution.
  18  *
  19  * Neither the name of the NLNET LABS nor the names of its contributors may
  20  * be used to endorse or promote products derived from this software without
  21  * specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  29  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /**
  37  * \file
  38  *
  39  * This file contains the functions for an authority zone.  This zone
  40  * is queried by the iterator, just like a stub or forward zone, but then
  41  * the data is locally held.
  42  */
  43
  44 #include "config.h"
  45 #include "services/authzone.h"
  46 #include "util/data/dname.h"
  47 #include "util/data/msgparse.h"
  48 #include "util/data/msgreply.h"
  49 #include "util/data/msgencode.h"
  50 #include "util/data/packed_rrset.h"
  51 #include "util/regional.h"
  52 #include "util/net_help.h"
  53 #include "util/netevent.h"
  54 #include "util/config_file.h"
  55 #include "util/log.h"
  56 #include "util/module.h"
  57 #include "util/random.h"
  58 #include "services/cache/dns.h"
  59 #include "services/outside_network.h"
  60 #include "services/listen_dnsport.h"
  61 #include "services/mesh.h"
  62 #include "sldns/rrdef.h"
  63 #include "sldns/pkthdr.h"
  64 #include "sldns/sbuffer.h"
  65 #include "sldns/str2wire.h"
  66 #include "sldns/wire2str.h"
  67 #include "sldns/parseutil.h"
  68 #include "sldns/keyraw.h"
  69 #include "validator/val_nsec3.h"
  70 #include "validator/val_secalgo.h"
  71 #include <ctype.h>
  72
  73 /** bytes to use for NSEC3 hash buffer. 20 for sha1 */
  74 #define N3HASHBUFLEN 32
  75 /** max number of CNAMEs we are willing to follow (in one answer) */
  76 #define MAX_CNAME_CHAIN 8
  77 /** timeout for probe packets for SOA */
  78 #define AUTH_PROBE_TIMEOUT 100 /* msec */
  79 /** when to stop with SOA probes (when exponential timeouts exceed this) */
  80 #define AUTH_PROBE_TIMEOUT_STOP 1000 /* msec */
  81 /* auth transfer timeout for TCP connections, in msec */
  82 #define AUTH_TRANSFER_TIMEOUT 10000 /* msec */
  83 /* auth transfer max backoff for failed tranfers and probes */
  84 #define AUTH_TRANSFER_MAX_BACKOFF 86400 /* sec */
  85 /* auth http port number */
  86 #define AUTH_HTTP_PORT 80
  87 /* auth https port number */
  88 #define AUTH_HTTPS_PORT 443
  89 /* max depth for nested $INCLUDEs */
  90 #define MAX_INCLUDE_DEPTH 10
  91 /** number of timeouts before we fallback from IXFR to AXFR,
  92  * because some versions of servers (eg. dnsmasq) drop IXFR packets. */
  93 #define NUM_TIMEOUTS_FALLBACK_IXFR 3
  94
  95 /** pick up nextprobe task to start waiting to perform transfer actions */
  96 static void xfr_set_timeout(struct auth_xfer* xfr, struct module_env* env,
  97         int failure, int lookup_only);
  98 /** move to sending the probe packets, next if fails. task_probe */
  99 static void xfr_probe_send_or_end(struct auth_xfer* xfr,
 100         struct module_env* env);
 101 /** pick up probe task with specified(or NULL) destination first,
 102  * or transfer task if nothing to probe, or false if already in progress */
 103 static int xfr_start_probe(struct auth_xfer* xfr, struct module_env* env,
 104         struct auth_master* spec);
 105 /** delete xfer structure (not its tree entry) */
 106 static void auth_xfer_delete(struct auth_xfer* xfr);
 107
 108 /** create new dns_msg */
 109 static struct dns_msg*
 110 msg_create(struct regional* region, struct query_info* qinfo)
 111 {
 112         struct dns_msg* msg = (struct dns_msg*)regional_alloc(region,
 113                 sizeof(struct dns_msg));
 114         if(!msg)
 115                 return NULL;
 116         msg->qinfo.qname = regional_alloc_init(region, qinfo->qname,
 117                 qinfo->qname_len);
 118         if(!msg->qinfo.qname)
 119                 return NULL;
 120         msg->qinfo.qname_len = qinfo->qname_len;
 121         msg->qinfo.qtype = qinfo->qtype;
 122         msg->qinfo.qclass = qinfo->qclass;
 123         msg->qinfo.local_alias = NULL;
 124         /* non-packed reply_info, because it needs to grow the array */
 125         msg->rep = (struct reply_info*)regional_alloc_zero(region,
 126                 sizeof(struct reply_info)-sizeof(struct rrset_ref));
 127         if(!msg->rep)
 128                 return NULL;
 129         msg->rep->flags = (uint16_t)(BIT_QR | BIT_AA);
 130         msg->rep->authoritative = 1;
 131         msg->rep->qdcount = 1;
 132         /* rrsets is NULL, no rrsets yet */
 133         return msg;
 134 }
 135
 136 /** grow rrset array by one in msg */
 137 static int
 138 msg_grow_array(struct regional* region, struct dns_msg* msg)
 139 {
 140         if(msg->rep->rrsets == NULL) {
 141                 msg->rep->rrsets = regional_alloc_zero(region,
 142                         sizeof(struct ub_packed_rrset_key*)*(msg->rep->rrset_count+1));
 143                 if(!msg->rep->rrsets)
 144                         return 0;
 145         } else {
 146                 struct ub_packed_rrset_key** rrsets_old = msg->rep->rrsets;
 147                 msg->rep->rrsets = regional_alloc_zero(region,
 148                         sizeof(struct ub_packed_rrset_key*)*(msg->rep->rrset_count+1));
 149                 if(!msg->rep->rrsets)
 150                         return 0;
 151                 memmove(msg->rep->rrsets, rrsets_old,
 152                         sizeof(struct ub_packed_rrset_key*)*msg->rep->rrset_count);
 153         }
 154         return 1;
 155 }
 156
 157 /** get ttl of rrset */
 158 static time_t
 159 get_rrset_ttl(struct ub_packed_rrset_key* k)
 160 {
 161         struct packed_rrset_data* d = (struct packed_rrset_data*)
 162                 k->entry.data;
 163         return d->ttl;
 164 }
 165
 166 /** Copy rrset into region from domain-datanode and packet rrset */
 167 static struct ub_packed_rrset_key*
 168 auth_packed_rrset_copy_region(struct auth_zone* z, struct auth_data* node,
 169         struct auth_rrset* rrset, struct regional* region, time_t adjust)
 170 {
 171         struct ub_packed_rrset_key key;
 172         memset(&key, 0, sizeof(key));
 173         key.entry.key = &key;
 174         key.entry.data = rrset->data;
 175         key.rk.dname = node->name;
 176         key.rk.dname_len = node->namelen;
 177         key.rk.type = htons(rrset->type);
 178         key.rk.rrset_class = htons(z->dclass);
 179         key.entry.hash = rrset_key_hash(&key.rk);
 180         return packed_rrset_copy_region(&key, region, adjust);
 181 }
 182
 183 /** fix up msg->rep TTL and prefetch ttl */
 184 static void
 185 msg_ttl(struct dns_msg* msg)
 186 {
 187         if(msg->rep->rrset_count == 0) return;
 188         if(msg->rep->rrset_count == 1) {
 189                 msg->rep->ttl = get_rrset_ttl(msg->rep->rrsets[0]);
 190                 msg->rep->prefetch_ttl = PREFETCH_TTL_CALC(msg->rep->ttl);
 191                 msg->rep->serve_expired_ttl = msg->rep->ttl + SERVE_EXPIRED_TTL;
 192         } else if(get_rrset_ttl(msg->rep->rrsets[msg->rep->rrset_count-1]) <
 193                 msg->rep->ttl) {
 194                 msg->rep->ttl = get_rrset_ttl(msg->rep->rrsets[
 195                         msg->rep->rrset_count-1]);
 196                 msg->rep->prefetch_ttl = PREFETCH_TTL_CALC(msg->rep->ttl);
 197                 msg->rep->serve_expired_ttl = msg->rep->ttl + SERVE_EXPIRED_TTL;
 198         }
 199 }
 200
 201 /** see if rrset is a duplicate in the answer message */
 202 static int
 203 msg_rrset_duplicate(struct dns_msg* msg, uint8_t* nm, size_t nmlen,
 204         uint16_t type, uint16_t dclass)
 205 {
 206         size_t i;
 207         for(i=0; i<msg->rep->rrset_count; i++) {
 208                 struct ub_packed_rrset_key* k = msg->rep->rrsets[i];
 209                 if(ntohs(k->rk.type) == type && k->rk.dname_len == nmlen &&
 210                         ntohs(k->rk.rrset_class) == dclass &&
 211                         query_dname_compare(k->rk.dname, nm) == 0)
 212                         return 1;
 213         }
 214         return 0;
 215 }
 216
 217 /** add rrset to answer section (no auth, add rrsets yet) */
 218 static int
 219 msg_add_rrset_an(struct auth_zone* z, struct regional* region,
 220         struct dns_msg* msg, struct auth_data* node, struct auth_rrset* rrset)
 221 {
 222         log_assert(msg->rep->ns_numrrsets == 0);
 223         log_assert(msg->rep->ar_numrrsets == 0);
 224         if(!rrset || !node)
 225                 return 1;
 226         if(msg_rrset_duplicate(msg, node->name, node->namelen, rrset->type,
 227                 z->dclass))
 228                 return 1;
 229         /* grow array */
 230         if(!msg_grow_array(region, msg))
 231                 return 0;
 232         /* copy it */
 233         if(!(msg->rep->rrsets[msg->rep->rrset_count] =
 234                 auth_packed_rrset_copy_region(z, node, rrset, region, 0)))
 235                 return 0;
 236         msg->rep->rrset_count++;
 237         msg->rep->an_numrrsets++;
 238         msg_ttl(msg);
 239         return 1;
 240 }
 241
 242 /** add rrset to authority section (no additonal section rrsets yet) */
 243 static int
 244 msg_add_rrset_ns(struct auth_zone* z, struct regional* region,
 245         struct dns_msg* msg, struct auth_data* node, struct auth_rrset* rrset)
 246 {
 247         log_assert(msg->rep->ar_numrrsets == 0);
 248         if(!rrset || !node)
 249                 return 1;
 250         if(msg_rrset_duplicate(msg, node->name, node->namelen, rrset->type,
 251                 z->dclass))
 252                 return 1;
 253         /* grow array */
 254         if(!msg_grow_array(region, msg))
 255                 return 0;
 256         /* copy it */
 257         if(!(msg->rep->rrsets[msg->rep->rrset_count] =
 258                 auth_packed_rrset_copy_region(z, node, rrset, region, 0)))
 259                 return 0;
 260         msg->rep->rrset_count++;
 261         msg->rep->ns_numrrsets++;
 262         msg_ttl(msg);
 263         return 1;
 264 }
 265
 266 /** add rrset to additional section */
 267 static int
 268 msg_add_rrset_ar(struct auth_zone* z, struct regional* region,
 269         struct dns_msg* msg, struct auth_data* node, struct auth_rrset* rrset)
 270 {
 271         if(!rrset || !node)
 272                 return 1;
 273         if(msg_rrset_duplicate(msg, node->name, node->namelen, rrset->type,
 274                 z->dclass))
 275                 return 1;
 276         /* grow array */
 277         if(!msg_grow_array(region, msg))
 278                 return 0;
 279         /* copy it */
 280         if(!(msg->rep->rrsets[msg->rep->rrset_count] =
 281                 auth_packed_rrset_copy_region(z, node, rrset, region, 0)))
 282                 return 0;
 283         msg->rep->rrset_count++;
 284         msg->rep->ar_numrrsets++;
 285         msg_ttl(msg);
 286         return 1;
 287 }
 288
 289 struct auth_zones* auth_zones_create(void)
 290 {
 291         struct auth_zones* az = (struct auth_zones*)calloc(1, sizeof(*az));
 292         if(!az) {
 293                 log_err("out of memory");
 294                 return NULL;
 295         }
 296         rbtree_init(&az->ztree, &auth_zone_cmp);
 297         rbtree_init(&az->xtree, &auth_xfer_cmp);
 298         lock_rw_init(&az->lock);
 299         lock_protect(&az->lock, &az->ztree, sizeof(az->ztree));
 300         lock_protect(&az->lock, &az->xtree, sizeof(az->xtree));
 301         /* also lock protects the rbnode's in struct auth_zone, auth_xfer */
 302         return az;
 303 }
 304
 305 int auth_zone_cmp(const void* z1, const void* z2)
 306 {
 307         /* first sort on class, so that hierarchy can be maintained within
 308          * a class */
 309         struct auth_zone* a = (struct auth_zone*)z1;
 310         struct auth_zone* b = (struct auth_zone*)z2;
 311         int m;
 312         if(a->dclass != b->dclass) {
 313                 if(a->dclass < b->dclass)
 314                         return -1;
 315                 return 1;
 316         }
 317         /* sorted such that higher zones sort before lower zones (their
 318          * contents) */
 319         return dname_lab_cmp(a->name, a->namelabs, b->name, b->namelabs, &m);
 320 }
 321
 322 int auth_data_cmp(const void* z1, const void* z2)
 323 {
 324         struct auth_data* a = (struct auth_data*)z1;
 325         struct auth_data* b = (struct auth_data*)z2;
 326         int m;
 327         /* canonical sort, because DNSSEC needs that */
 328         return dname_canon_lab_cmp(a->name, a->namelabs, b->name,
 329                 b->namelabs, &m);
 330 }
 331
 332 int auth_xfer_cmp(const void* z1, const void* z2)
 333 {
 334         /* first sort on class, so that hierarchy can be maintained within
 335          * a class */
 336         struct auth_xfer* a = (struct auth_xfer*)z1;
 337         struct auth_xfer* b = (struct auth_xfer*)z2;
 338         int m;
 339         if(a->dclass != b->dclass) {
 340                 if(a->dclass < b->dclass)
 341                         return -1;
 342                 return 1;
 343         }
 344         /* sorted such that higher zones sort before lower zones (their
 345          * contents) */
 346         return dname_lab_cmp(a->name, a->namelabs, b->name, b->namelabs, &m);
 347 }
 348
 349 /** delete auth rrset node */
 350 static void
 351 auth_rrset_delete(struct auth_rrset* rrset)
 352 {
 353         if(!rrset) return;
 354         free(rrset->data);
 355         free(rrset);
 356 }
 357
 358 /** delete auth data domain node */
 359 static void
 360 auth_data_delete(struct auth_data* n)
 361 {
 362         struct auth_rrset* p, *np;
 363         if(!n) return;
 364         p = n->rrsets;
 365         while(p) {
 366                 np = p->next;
 367                 auth_rrset_delete(p);
 368                 p = np;
 369         }
 370         free(n->name);
 371         free(n);
 372 }
 373
 374 /** helper traverse to delete zones */
 375 static void
 376 auth_data_del(rbnode_type* n, void* ATTR_UNUSED(arg))
 377 {
 378         struct auth_data* z = (struct auth_data*)n->key;
 379         auth_data_delete(z);
 380 }
 381
 382 /** delete an auth zone structure (tree remove must be done elsewhere) */
 383 static void
 384 auth_zone_delete(struct auth_zone* z)
 385 {
 386         if(!z) return;
 387         lock_rw_destroy(&z->lock);
 388         traverse_postorder(&z->data, auth_data_del, NULL);
 389         free(z->name);
 390         free(z->zonefile);
 391         free(z);
 392 }
 393
 394 struct auth_zone*
 395 auth_zone_create(struct auth_zones* az, uint8_t* nm, size_t nmlen,
 396         uint16_t dclass)
 397 {
 398         struct auth_zone* z = (struct auth_zone*)calloc(1, sizeof(*z));
 399         if(!z) {
 400                 return NULL;
 401         }
 402         z->node.key = z;
 403         z->dclass = dclass;
 404         z->namelen = nmlen;
 405         z->namelabs = dname_count_labels(nm);
 406         z->name = memdup(nm, nmlen);
 407         if(!z->name) {
 408                 free(z);
 409                 return NULL;
 410         }
 411         rbtree_init(&z->data, &auth_data_cmp);
 412         lock_rw_init(&z->lock);
 413         lock_protect(&z->lock, &z->name, sizeof(*z)-sizeof(rbnode_type));
 414         lock_rw_wrlock(&z->lock);
 415         /* z lock protects all, except rbtree itself, which is az->lock */
 416         if(!rbtree_insert(&az->ztree, &z->node)) {
 417                 lock_rw_unlock(&z->lock);
 418                 auth_zone_delete(z);
 419                 log_warn("duplicate auth zone");
 420                 return NULL;
 421         }
 422         return z;
 423 }
 424
 425 struct auth_zone*
 426 auth_zone_find(struct auth_zones* az, uint8_t* nm, size_t nmlen,
 427         uint16_t dclass)
 428 {
 429         struct auth_zone key;
 430         key.node.key = &key;
 431         key.dclass = dclass;
 432         key.name = nm;
 433         key.namelen = nmlen;
 434         key.namelabs = dname_count_labels(nm);
 435         return (struct auth_zone*)rbtree_search(&az->ztree, &key);
 436 }
 437
 438 struct auth_xfer*
 439 auth_xfer_find(struct auth_zones* az, uint8_t* nm, size_t nmlen,
 440         uint16_t dclass)
 441 {
 442         struct auth_xfer key;
 443         key.node.key = &key;
 444         key.dclass = dclass;
 445         key.name = nm;
 446         key.namelen = nmlen;
 447         key.namelabs = dname_count_labels(nm);
 448         return (struct auth_xfer*)rbtree_search(&az->xtree, &key);
 449 }
 450
 451 /** find an auth zone or sorted less-or-equal, return true if exact */
 452 static int
 453 auth_zone_find_less_equal(struct auth_zones* az, uint8_t* nm, size_t nmlen,
 454         uint16_t dclass, struct auth_zone** z)
 455 {
 456         struct auth_zone key;
 457         key.node.key = &key;
 458         key.dclass = dclass;
 459         key.name = nm;
 460         key.namelen = nmlen;
 461         key.namelabs = dname_count_labels(nm);
 462         return rbtree_find_less_equal(&az->ztree, &key, (rbnode_type**)z);
 463 }
 464
 465
 466 /** find the auth zone that is above the given name */
 467 struct auth_zone*
 468 auth_zones_find_zone(struct auth_zones* az, uint8_t* name, size_t name_len,
 469         uint16_t dclass)
 470 {
 471         uint8_t* nm = name;
 472         size_t nmlen = name_len;
 473         struct auth_zone* z;
 474         if(auth_zone_find_less_equal(az, nm, nmlen, dclass, &z)) {
 475                 /* exact match */
 476                 return z;
 477         } else {
 478                 /* less-or-nothing */
 479                 if(!z) return NULL; /* nothing smaller, nothing above it */
 480                 /* we found smaller name; smaller may be above the name,
 481                  * but not below it. */
 482                 nm = dname_get_shared_topdomain(z->name, name);
 483                 dname_count_size_labels(nm, &nmlen);
 484                 z = NULL;
 485         }
 486
 487         /* search up */
 488         while(!z) {
 489                 z = auth_zone_find(az, nm, nmlen, dclass);
 490                 if(z) return z;
 491                 if(dname_is_root(nm)) break;
 492                 dname_remove_label(&nm, &nmlen);
 493         }
 494         return NULL;
 495 }
 496
 497 /** find or create zone with name str. caller must have lock on az.
 498  * returns a wrlocked zone */
 499 static struct auth_zone*
 500 auth_zones_find_or_add_zone(struct auth_zones* az, char* name)
 501 {
 502         uint8_t nm[LDNS_MAX_DOMAINLEN+1];
 503         size_t nmlen = sizeof(nm);
 504         struct auth_zone* z;
 505
 506         if(sldns_str2wire_dname_buf(name, nm, &nmlen) != 0) {
 507                 log_err("cannot parse auth zone name: %s", name);
 508                 return 0;
 509         }
 510         z = auth_zone_find(az, nm, nmlen, LDNS_RR_CLASS_IN);
 511         if(!z) {
 512                 /* not found, create the zone */
 513                 z = auth_zone_create(az, nm, nmlen, LDNS_RR_CLASS_IN);
 514         } else {
 515                 lock_rw_wrlock(&z->lock);
 516         }
 517         return z;
 518 }
 519
 520 /** find or create xfer zone with name str. caller must have lock on az.
 521  * returns a locked xfer */
 522 static struct auth_xfer*
 523 auth_zones_find_or_add_xfer(struct auth_zones* az, struct auth_zone* z)
 524 {
 525         struct auth_xfer* x;
 526         x = auth_xfer_find(az, z->name, z->namelen, z->dclass);
 527         if(!x) {
 528                 /* not found, create the zone */
 529                 x = auth_xfer_create(az, z);
 530         } else {
 531                 lock_basic_lock(&x->lock);
 532         }
 533         return x;
 534 }
 535
 536 int
 537 auth_zone_set_zonefile(struct auth_zone* z, char* zonefile)
 538 {
 539         if(z->zonefile) free(z->zonefile);
 540         if(zonefile == NULL) {
 541                 z->zonefile = NULL;
 542         } else {
 543                 z->zonefile = strdup(zonefile);
 544                 if(!z->zonefile) {
 545                         log_err("malloc failure");
 546                         return 0;
 547                 }
 548         }
 549         return 1;
 550 }
 551
 552 /** set auth zone fallback. caller must have lock on zone */
 553 int
 554 auth_zone_set_fallback(struct auth_zone* z, char* fallbackstr)
 555 {
 556         if(strcmp(fallbackstr, "yes") != 0 && strcmp(fallbackstr, "no") != 0){
 557                 log_err("auth zone fallback, expected yes or no, got %s",
 558                         fallbackstr);
 559                 return 0;
 560         }
 561         z->fallback_enabled = (strcmp(fallbackstr, "yes")==0);
 562         return 1;
 563 }
 564
 565 /** create domain with the given name */
 566 static struct auth_data*
 567 az_domain_create(struct auth_zone* z, uint8_t* nm, size_t nmlen)
 568 {
 569         struct auth_data* n = (struct auth_data*)malloc(sizeof(*n));
 570         if(!n) return NULL;
 571         memset(n, 0, sizeof(*n));
 572         n->node.key = n;
 573         n->name = memdup(nm, nmlen);
 574         if(!n->name) {
 575                 free(n);
 576                 return NULL;
 577         }
 578         n->namelen = nmlen;
 579         n->namelabs = dname_count_labels(nm);
 580         if(!rbtree_insert(&z->data, &n->node)) {
 581                 log_warn("duplicate auth domain name");
 582                 free(n->name);
 583                 free(n);
 584                 return NULL;
 585         }
 586         return n;
 587 }
 588
 589 /** find domain with exactly the given name */
 590 static struct auth_data*
 591 az_find_name(struct auth_zone* z, uint8_t* nm, size_t nmlen)
 592 {
 593         struct auth_zone key;
 594         key.node.key = &key;
 595         key.name = nm;
 596         key.namelen = nmlen;
 597         key.namelabs = dname_count_labels(nm);
 598         return (struct auth_data*)rbtree_search(&z->data, &key);
 599 }
 600
 601 /** Find domain name (or closest match) */
 602 static void
 603 az_find_domain(struct auth_zone* z, struct query_info* qinfo, int* node_exact,
 604         struct auth_data** node)
 605 {
 606         struct auth_zone key;
 607         key.node.key = &key;
 608         key.name = qinfo->qname;
 609         key.namelen = qinfo->qname_len;
 610         key.namelabs = dname_count_labels(key.name);
 611         *node_exact = rbtree_find_less_equal(&z->data, &key,
 612                 (rbnode_type**)node);
 613 }
 614
 615 /** find or create domain with name in zone */
 616 static struct auth_data*
 617 az_domain_find_or_create(struct auth_zone* z, uint8_t* dname,
 618         size_t dname_len)
 619 {
 620         struct auth_data* n = az_find_name(z, dname, dname_len);
 621         if(!n) {
 622                 n = az_domain_create(z, dname, dname_len);
 623         }
 624         return n;
 625 }
 626
 627 /** find rrset of given type in the domain */
 628 static struct auth_rrset*
 629 az_domain_rrset(struct auth_data* n, uint16_t t)
 630 {
 631         struct auth_rrset* rrset;
 632         if(!n) return NULL;
 633         rrset = n->rrsets;
 634         while(rrset) {
 635                 if(rrset->type == t)
 636                         return rrset;
 637                 rrset = rrset->next;
 638         }
 639         return NULL;
 640 }
 641
 642 /** remove rrset of this type from domain */
 643 static void
 644 domain_remove_rrset(struct auth_data* node, uint16_t rr_type)
 645 {
 646         struct auth_rrset* rrset, *prev;
 647         if(!node) return;
 648         prev = NULL;
 649         rrset = node->rrsets;
 650         while(rrset) {
 651                 if(rrset->type == rr_type) {
 652                         /* found it, now delete it */
 653                         if(prev) prev->next = rrset->next;
 654                         else    node->rrsets = rrset->next;
 655                         auth_rrset_delete(rrset);
 656                         return;
 657                 }
 658                 prev = rrset;
 659                 rrset = rrset->next;
 660         }
 661 }
 662
 663 /** find an rr index in the rrset.  returns true if found */
 664 static int
 665 az_rrset_find_rr(struct packed_rrset_data* d, uint8_t* rdata, size_t len,
 666         size_t* index)
 667 {
 668         size_t i;
 669         for(i=0; i<d->count; i++) {
 670                 if(d->rr_len[i] != len)
 671                         continue;
 672                 if(memcmp(d->rr_data[i], rdata, len) == 0) {
 673                         *index = i;
 674                         return 1;
 675                 }
 676         }
 677         return 0;
 678 }
 679
 680 /** find an rrsig index in the rrset.  returns true if found */
 681 static int
 682 az_rrset_find_rrsig(struct packed_rrset_data* d, uint8_t* rdata, size_t len,
 683         size_t* index)
 684 {
 685         size_t i;
 686         for(i=d->count; i<d->count + d->rrsig_count; i++) {
 687                 if(d->rr_len[i] != len)
 688                         continue;
 689                 if(memcmp(d->rr_data[i], rdata, len) == 0) {
 690                         *index = i;
 691                         return 1;
 692                 }
 693         }
 694         return 0;
 695 }
 696
 697 /** see if rdata is duplicate */
 698 static int
 699 rdata_duplicate(struct packed_rrset_data* d, uint8_t* rdata, size_t len)
 700 {
 701         size_t i;
 702         for(i=0; i<d->count + d->rrsig_count; i++) {
 703                 if(d->rr_len[i] != len)
 704                         continue;
 705                 if(memcmp(d->rr_data[i], rdata, len) == 0)
 706                         return 1;
 707         }
 708         return 0;
 709 }
 710
 711 /** get rrsig type covered from rdata.
 712  * @param rdata: rdata in wireformat, starting with 16bit rdlength.
 713  * @param rdatalen: length of rdata buffer.
 714  * @return type covered (or 0).
 715  */
 716 static uint16_t
 717 rrsig_rdata_get_type_covered(uint8_t* rdata, size_t rdatalen)
 718 {
 719         if(rdatalen < 4)
 720                 return 0;
 721         return sldns_read_uint16(rdata+2);
 722 }
 723
 724 /** remove RR from existing RRset. Also sig, if it is a signature.
 725  * reallocates the packed rrset for a new one, false on alloc failure */
 726 static int
 727 rrset_remove_rr(struct auth_rrset* rrset, size_t index)
 728 {
 729         struct packed_rrset_data* d, *old = rrset->data;
 730         size_t i;
 731         if(index >= old->count + old->rrsig_count)
 732                 return 0; /* index out of bounds */
 733         d = (struct packed_rrset_data*)calloc(1, packed_rrset_sizeof(old) - (
 734                 sizeof(size_t) + sizeof(uint8_t*) + sizeof(time_t) +
 735                 old->rr_len[index]));
 736         if(!d) {
 737                 log_err("malloc failure");
 738                 return 0;
 739         }
 740         d->ttl = old->ttl;
 741         d->count = old->count;
 742         d->rrsig_count = old->rrsig_count;
 743         if(index < d->count) d->count--;
 744         else d->rrsig_count--;
 745         d->trust = old->trust;
 746         d->security = old->security;
 747
 748         /* set rr_len, needed for ptr_fixup */
 749         d->rr_len = (size_t*)((uint8_t*)d +
 750                 sizeof(struct packed_rrset_data));
 751         if(index > 0)
 752                 memmove(d->rr_len, old->rr_len, (index)*sizeof(size_t));
 753         if(index+1 < old->count+old->rrsig_count)
 754                 memmove(&d->rr_len[index], &old->rr_len[index+1],
 755                 (old->count+old->rrsig_count - (index+1))*sizeof(size_t));
 756         packed_rrset_ptr_fixup(d);
 757
 758         /* move over ttls */
 759         if(index > 0)
 760                 memmove(d->rr_ttl, old->rr_ttl, (index)*sizeof(time_t));
 761         if(index+1 < old->count+old->rrsig_count)
 762                 memmove(&d->rr_ttl[index], &old->rr_ttl[index+1],
 763                 (old->count+old->rrsig_count - (index+1))*sizeof(time_t));
 764
 765         /* move over rr_data */
 766         for(i=0; i<d->count+d->rrsig_count; i++) {
 767                 size_t oldi;
 768                 if(i < index) oldi = i;
 769                 else oldi = i+1;
 770                 memmove(d->rr_data[i], old->rr_data[oldi], d->rr_len[i]);
 771         }
 772
 773         /* recalc ttl (lowest of remaining RR ttls) */
 774         if(d->count + d->rrsig_count > 0)
 775                 d->ttl = d->rr_ttl[0];
 776         for(i=0; i<d->count+d->rrsig_count; i++) {
 777                 if(d->rr_ttl[i] < d->ttl)
 778                         d->ttl = d->rr_ttl[i];
 779         }
 780
 781         free(rrset->data);
 782         rrset->data = d;
 783         return 1;
 784 }
 785
 786 /** add RR to existing RRset. If insert_sig is true, add to rrsigs.
 787  * This reallocates the packed rrset for a new one */
 788 static int
 789 rrset_add_rr(struct auth_rrset* rrset, uint32_t rr_ttl, uint8_t* rdata,
 790         size_t rdatalen, int insert_sig)
 791 {
 792         struct packed_rrset_data* d, *old = rrset->data;
 793         size_t total, old_total;
 794
 795         d = (struct packed_rrset_data*)calloc(1, packed_rrset_sizeof(old)
 796                 + sizeof(size_t) + sizeof(uint8_t*) + sizeof(time_t)
 797                 + rdatalen);
 798         if(!d) {
 799                 log_err("out of memory");
 800                 return 0;
 801         }
 802         /* copy base values */
 803         memcpy(d, old, sizeof(struct packed_rrset_data));
 804         if(!insert_sig) {
 805                 d->count++;
 806         } else {
 807                 d->rrsig_count++;
 808         }
 809         old_total = old->count + old->rrsig_count;
 810         total = d->count + d->rrsig_count;
 811         /* set rr_len, needed for ptr_fixup */
 812         d->rr_len = (size_t*)((uint8_t*)d +
 813                 sizeof(struct packed_rrset_data));
 814         if(old->count != 0)
 815                 memmove(d->rr_len, old->rr_len, old->count*sizeof(size_t));
 816         if(old->rrsig_count != 0)
 817                 memmove(d->rr_len+d->count, old->rr_len+old->count,
 818                         old->rrsig_count*sizeof(size_t));
 819         if(!insert_sig)
 820                 d->rr_len[d->count-1] = rdatalen;
 821         else    d->rr_len[total-1] = rdatalen;
 822         packed_rrset_ptr_fixup(d);
 823         if((time_t)rr_ttl < d->ttl)
 824                 d->ttl = rr_ttl;
 825
 826         /* copy old values into new array */
 827         if(old->count != 0) {
 828                 memmove(d->rr_ttl, old->rr_ttl, old->count*sizeof(time_t));
 829                 /* all the old rr pieces are allocated sequential, so we
 830                  * can copy them in one go */
 831                 memmove(d->rr_data[0], old->rr_data[0],
 832                         (old->rr_data[old->count-1] - old->rr_data[0]) +
 833                         old->rr_len[old->count-1]);
 834         }
 835         if(old->rrsig_count != 0) {
 836                 memmove(d->rr_ttl+d->count, old->rr_ttl+old->count,
 837                         old->rrsig_count*sizeof(time_t));
 838                 memmove(d->rr_data[d->count], old->rr_data[old->count],
 839                         (old->rr_data[old_total-1] - old->rr_data[old->count]) +
 840                         old->rr_len[old_total-1]);
 841         }
 842
 843         /* insert new value */
 844         if(!insert_sig) {
 845                 d->rr_ttl[d->count-1] = rr_ttl;
 846                 memmove(d->rr_data[d->count-1], rdata, rdatalen);
 847         } else {
 848                 d->rr_ttl[total-1] = rr_ttl;
 849                 memmove(d->rr_data[total-1], rdata, rdatalen);
 850         }
 851
 852         rrset->data = d;
 853         free(old);
 854         return 1;
 855 }
 856
 857 /** Create new rrset for node with packed rrset with one RR element */
 858 static struct auth_rrset*
 859 rrset_create(struct auth_data* node, uint16_t rr_type, uint32_t rr_ttl,
 860         uint8_t* rdata, size_t rdatalen)
 861 {
 862         struct auth_rrset* rrset = (struct auth_rrset*)calloc(1,
 863                 sizeof(*rrset));
 864         struct auth_rrset* p, *prev;
 865         struct packed_rrset_data* d;
 866         if(!rrset) {
 867                 log_err("out of memory");
 868                 return NULL;
 869         }
 870         rrset->type = rr_type;
 871
 872         /* the rrset data structure, with one RR */
 873         d = (struct packed_rrset_data*)calloc(1,
 874                 sizeof(struct packed_rrset_data) + sizeof(size_t) +
 875                 sizeof(uint8_t*) + sizeof(time_t) + rdatalen);
 876         if(!d) {
 877                 free(rrset);
 878                 log_err("out of memory");
 879                 return NULL;
 880         }
 881         rrset->data = d;
 882         d->ttl = rr_ttl;
 883         d->trust = rrset_trust_prim_noglue;
 884         d->rr_len = (size_t*)((uint8_t*)d + sizeof(struct packed_rrset_data));
 885         d->rr_data = (uint8_t**)&(d->rr_len[1]);
 886         d->rr_ttl = (time_t*)&(d->rr_data[1]);
 887         d->rr_data[0] = (uint8_t*)&(d->rr_ttl[1]);
 888
 889         /* insert the RR */
 890         d->rr_len[0] = rdatalen;
 891         d->rr_ttl[0] = rr_ttl;
 892         memmove(d->rr_data[0], rdata, rdatalen);
 893         d->count++;
 894
 895         /* insert rrset into linked list for domain */
 896         /* find sorted place to link the rrset into the list */
 897         prev = NULL;
 898         p = node->rrsets;
 899         while(p && p->type<=rr_type) {
 900                 prev = p;
 901                 p = p->next;
 902         }
 903         /* so, prev is smaller, and p is larger than rr_type */
 904         rrset->next = p;
 905         if(prev) prev->next = rrset;
 906         else node->rrsets = rrset;
 907         return rrset;
 908 }
 909
 910 /** count number (and size) of rrsigs that cover a type */
 911 static size_t
 912 rrsig_num_that_cover(struct auth_rrset* rrsig, uint16_t rr_type, size_t* sigsz)
 913 {
 914         struct packed_rrset_data* d = rrsig->data;
 915         size_t i, num = 0;
 916         *sigsz = 0;
 917         log_assert(d && rrsig->type == LDNS_RR_TYPE_RRSIG);
 918         for(i=0; i<d->count+d->rrsig_count; i++) {
 919                 if(rrsig_rdata_get_type_covered(d->rr_data[i],
 920                         d->rr_len[i]) == rr_type) {
 921                         num++;
 922                         (*sigsz) += d->rr_len[i];
 923                 }
 924         }
 925         return num;
 926 }
 927
 928 /** See if rrsig set has covered sigs for rrset and move them over */
 929 static int
 930 rrset_moveover_rrsigs(struct auth_data* node, uint16_t rr_type,
 931         struct auth_rrset* rrset, struct auth_rrset* rrsig)
 932 {
 933         size_t sigs, sigsz, i, j, total;
 934         struct packed_rrset_data* sigold = rrsig->data;
 935         struct packed_rrset_data* old = rrset->data;
 936         struct packed_rrset_data* d, *sigd;
 937
 938         log_assert(rrset->type == rr_type);
 939         log_assert(rrsig->type == LDNS_RR_TYPE_RRSIG);
 940         sigs = rrsig_num_that_cover(rrsig, rr_type, &sigsz);
 941         if(sigs == 0) {
 942                 /* 0 rrsigs to move over, done */
 943                 return 1;
 944         }
 945
 946         /* allocate rrset sigsz larger for extra sigs elements, and
 947          * allocate rrsig sigsz smaller for less sigs elements. */
 948         d = (struct packed_rrset_data*)calloc(1, packed_rrset_sizeof(old)
 949                 + sigs*(sizeof(size_t) + sizeof(uint8_t*) + sizeof(time_t))
 950                 + sigsz);
 951         if(!d) {
 952                 log_err("out of memory");
 953                 return 0;
 954         }
 955         /* copy base values */
 956         total = old->count + old->rrsig_count;
 957         memcpy(d, old, sizeof(struct packed_rrset_data));
 958         d->rrsig_count += sigs;
 959         /* setup rr_len */
 960         d->rr_len = (size_t*)((uint8_t*)d +
 961                 sizeof(struct packed_rrset_data));
 962         if(total != 0)
 963                 memmove(d->rr_len, old->rr_len, total*sizeof(size_t));
 964         j = d->count+d->rrsig_count-sigs;
 965         for(i=0; i<sigold->count+sigold->rrsig_count; i++) {
 966                 if(rrsig_rdata_get_type_covered(sigold->rr_data[i],
 967                         sigold->rr_len[i]) == rr_type) {
 968                         d->rr_len[j] = sigold->rr_len[i];
 969                         j++;
 970                 }
 971         }
 972         packed_rrset_ptr_fixup(d);
 973
 974         /* copy old values into new array */
 975         if(total != 0) {
 976                 memmove(d->rr_ttl, old->rr_ttl, total*sizeof(time_t));
 977                 /* all the old rr pieces are allocated sequential, so we
 978                  * can copy them in one go */
 979                 memmove(d->rr_data[0], old->rr_data[0],
 980                         (old->rr_data[total-1] - old->rr_data[0]) +
 981                         old->rr_len[total-1]);
 982         }
 983
 984         /* move over the rrsigs to the larger rrset*/
 985         j = d->count+d->rrsig_count-sigs;
 986         for(i=0; i<sigold->count+sigold->rrsig_count; i++) {
 987                 if(rrsig_rdata_get_type_covered(sigold->rr_data[i],
 988                         sigold->rr_len[i]) == rr_type) {
 989                         /* move this one over to location j */
 990                         d->rr_ttl[j] = sigold->rr_ttl[i];
 991                         memmove(d->rr_data[j], sigold->rr_data[i],
 992                                 sigold->rr_len[i]);
 993                         if(d->rr_ttl[j] < d->ttl)
 994                                 d->ttl = d->rr_ttl[j];
 995                         j++;
 996                 }
 997         }
 998
 999         /* put it in and deallocate the old rrset */
1000         rrset->data = d;
1001         free(old);
1002
1003         /* now make rrsig set smaller */
1004         if(sigold->count+sigold->rrsig_count == sigs) {
1005                 /* remove all sigs from rrsig, remove it entirely */
1006                 domain_remove_rrset(node, LDNS_RR_TYPE_RRSIG);
1007                 return 1;
1008         }
1009         log_assert(packed_rrset_sizeof(sigold) > sigs*(sizeof(size_t) +
1010                 sizeof(uint8_t*) + sizeof(time_t)) + sigsz);
1011         sigd = (struct packed_rrset_data*)calloc(1, packed_rrset_sizeof(sigold)
1012                 - sigs*(sizeof(size_t) + sizeof(uint8_t*) + sizeof(time_t))
1013                 - sigsz);
1014         if(!sigd) {
1015                 /* no need to free up d, it has already been placed in the
1016                  * node->rrset structure */
1017                 log_err("out of memory");
1018                 return 0;
1019         }
1020         /* copy base values */
1021         memcpy(sigd, sigold, sizeof(struct packed_rrset_data));
1022         /* in sigd the RRSIGs are stored in the base of the RR, in count */
1023         sigd->count -= sigs;
1024         /* setup rr_len */
1025         sigd->rr_len = (size_t*)((uint8_t*)sigd +
1026                 sizeof(struct packed_rrset_data));
1027         j = 0;
1028         for(i=0; i<sigold->count+sigold->rrsig_count; i++) {
1029                 if(rrsig_rdata_get_type_covered(sigold->rr_data[i],
1030                         sigold->rr_len[i]) != rr_type) {
1031                         sigd->rr_len[j] = sigold->rr_len[i];
1032                         j++;
1033                 }
1034         }
1035         packed_rrset_ptr_fixup(sigd);
1036
1037         /* copy old values into new rrsig array */
1038         j = 0;
1039         for(i=0; i<sigold->count+sigold->rrsig_count; i++) {
1040                 if(rrsig_rdata_get_type_covered(sigold->rr_data[i],
1041                         sigold->rr_len[i]) != rr_type) {
1042                         /* move this one over to location j */
1043                         sigd->rr_ttl[j] = sigold->rr_ttl[i];
1044                         memmove(sigd->rr_data[j], sigold->rr_data[i],
1045                                 sigold->rr_len[i]);
1046                         if(j==0) sigd->ttl = sigd->rr_ttl[j];
1047                         else {
1048                                 if(sigd->rr_ttl[j] < sigd->ttl)
1049                                         sigd->ttl = sigd->rr_ttl[j];
1050                         }
1051                         j++;
1052                 }
1053         }
1054
1055         /* put it in and deallocate the old rrset */
1056         rrsig->data = sigd;
1057         free(sigold);
1058
1059         return 1;
1060 }
1061
1062 /** copy the rrsigs from the rrset to the rrsig rrset, because the rrset
1063  * is going to be deleted.  reallocates the RRSIG rrset data. */
1064 static int
1065 rrsigs_copy_from_rrset_to_rrsigset(struct auth_rrset* rrset,
1066         struct auth_rrset* rrsigset)
1067 {
1068         size_t i;
1069         if(rrset->data->rrsig_count == 0)
1070                 return 1;
1071
1072         /* move them over one by one, because there might be duplicates,
1073          * duplicates are ignored */
1074         for(i=rrset->data->count;
1075                 i<rrset->data->count+rrset->data->rrsig_count; i++) {
1076                 uint8_t* rdata = rrset->data->rr_data[i];
1077                 size_t rdatalen = rrset->data->rr_len[i];
1078                 time_t rr_ttl  = rrset->data->rr_ttl[i];
1079
1080                 if(rdata_duplicate(rrsigset->data, rdata, rdatalen)) {
1081                         continue;
1082                 }
1083                 if(!rrset_add_rr(rrsigset, rr_ttl, rdata, rdatalen, 0))
1084                         return 0;
1085         }
1086         return 1;
1087 }
1088
1089 /** Add rr to node, ignores duplicate RRs,
1090  * rdata points to buffer with rdatalen octets, starts with 2bytelength. */
1091 static int
1092 az_domain_add_rr(struct auth_data* node, uint16_t rr_type, uint32_t rr_ttl,
1093         uint8_t* rdata, size_t rdatalen, int* duplicate)
1094 {
1095         struct auth_rrset* rrset;
1096         /* packed rrsets have their rrsigs along with them, sort them out */
1097         if(rr_type == LDNS_RR_TYPE_RRSIG) {
1098                 uint16_t ctype = rrsig_rdata_get_type_covered(rdata, rdatalen);
1099                 if((rrset=az_domain_rrset(node, ctype))!= NULL) {
1100                         /* a node of the correct type exists, add the RRSIG
1101                          * to the rrset of the covered data type */
1102                         if(rdata_duplicate(rrset->data, rdata, rdatalen)) {
1103                                 if(duplicate) *duplicate = 1;
1104                                 return 1;
1105                         }
1106                         if(!rrset_add_rr(rrset, rr_ttl, rdata, rdatalen, 1))
1107                                 return 0;
1108                 } else if((rrset=az_domain_rrset(node, rr_type))!= NULL) {
1109                         /* add RRSIG to rrset of type RRSIG */
1110                         if(rdata_duplicate(rrset->data, rdata, rdatalen)) {
1111                                 if(duplicate) *duplicate = 1;
1112                                 return 1;
1113                         }
1114                         if(!rrset_add_rr(rrset, rr_ttl, rdata, rdatalen, 0))
1115                                 return 0;
1116                 } else {
1117                         /* create rrset of type RRSIG */
1118                         if(!rrset_create(node, rr_type, rr_ttl, rdata,
1119                                 rdatalen))
1120                                 return 0;
1121                 }
1122         } else {
1123                 /* normal RR type */
1124                 if((rrset=az_domain_rrset(node, rr_type))!= NULL) {
1125                         /* add data to existing node with data type */
1126                         if(rdata_duplicate(rrset->data, rdata, rdatalen)) {
1127                                 if(duplicate) *duplicate = 1;
1128                                 return 1;
1129                         }
1130                         if(!rrset_add_rr(rrset, rr_ttl, rdata, rdatalen, 0))
1131                                 return 0;
1132                 } else {
1133                         struct auth_rrset* rrsig;
1134                         /* create new node with data type */
1135                         if(!(rrset=rrset_create(node, rr_type, rr_ttl, rdata,
1136                                 rdatalen)))
1137                                 return 0;
1138
1139                         /* see if node of type RRSIG has signatures that
1140                          * cover the data type, and move them over */
1141                         /* and then make the RRSIG type smaller */
1142                         if((rrsig=az_domain_rrset(node, LDNS_RR_TYPE_RRSIG))
1143                                 != NULL) {
1144                                 if(!rrset_moveover_rrsigs(node, rr_type,
1145                                         rrset, rrsig))
1146                                         return 0;
1147                         }
1148                 }
1149         }
1150         return 1;
1151 }
1152
1153 /** insert RR into zone, ignore duplicates */
1154 static int
1155 az_insert_rr(struct auth_zone* z, uint8_t* rr, size_t rr_len,
1156         size_t dname_len, int* duplicate)
1157 {
1158         struct auth_data* node;
1159         uint8_t* dname = rr;
1160         uint16_t rr_type = sldns_wirerr_get_type(rr, rr_len, dname_len);
1161         uint16_t rr_class = sldns_wirerr_get_class(rr, rr_len, dname_len);
1162         uint32_t rr_ttl = sldns_wirerr_get_ttl(rr, rr_len, dname_len);
1163         size_t rdatalen = ((size_t)sldns_wirerr_get_rdatalen(rr, rr_len,
1164                 dname_len))+2;
1165         /* rdata points to rdata prefixed with uint16 rdatalength */
1166         uint8_t* rdata = sldns_wirerr_get_rdatawl(rr, rr_len, dname_len);
1167
1168         if(rr_class != z->dclass) {
1169                 log_err("wrong class for RR");
1170                 return 0;
1171         }
1172         if(!(node=az_domain_find_or_create(z, dname, dname_len))) {
1173                 log_err("cannot create domain");
1174                 return 0;
1175         }
1176         if(!az_domain_add_rr(node, rr_type, rr_ttl, rdata, rdatalen,
1177                 duplicate)) {
1178                 log_err("cannot add RR to domain");
1179                 return 0;
1180         }
1181         return 1;
1182 }
1183
1184 /** Remove rr from node, ignores nonexisting RRs,
1185  * rdata points to buffer with rdatalen octets, starts with 2bytelength. */
1186 static int
1187 az_domain_remove_rr(struct auth_data* node, uint16_t rr_type,
1188         uint8_t* rdata, size_t rdatalen, int* nonexist)
1189 {
1190         struct auth_rrset* rrset;
1191         size_t index = 0;
1192
1193         /* find the plain RR of the given type */
1194         if((rrset=az_domain_rrset(node, rr_type))!= NULL) {
1195                 if(az_rrset_find_rr(rrset->data, rdata, rdatalen, &index)) {
1196                         if(rrset->data->count == 1 &&
1197                                 rrset->data->rrsig_count == 0) {
1198                                 /* last RR, delete the rrset */
1199                                 domain_remove_rrset(node, rr_type);
1200                         } else if(rrset->data->count == 1 &&
1201                                 rrset->data->rrsig_count != 0) {
1202                                 /* move RRSIGs to the RRSIG rrset, or
1203                                  * this one becomes that RRset */
1204                                 struct auth_rrset* rrsigset = az_domain_rrset(
1205                                         node, LDNS_RR_TYPE_RRSIG);
1206                                 if(rrsigset) {
1207                                         /* move left over rrsigs to the
1208                                          * existing rrset of type RRSIG */
1209                                         rrsigs_copy_from_rrset_to_rrsigset(
1210                                                 rrset, rrsigset);
1211                                         /* and then delete the rrset */
1212                                         domain_remove_rrset(node, rr_type);
1213                                 } else {
1214                                         /* no rrset of type RRSIG, this
1215                                          * set is now of that type,
1216                                          * just remove the rr */
1217                                         if(!rrset_remove_rr(rrset, index))
1218                                                 return 0;
1219                                         rrset->type = LDNS_RR_TYPE_RRSIG;
1220                                         rrset->data->count = rrset->data->rrsig_count;
1221                                         rrset->data->rrsig_count = 0;
1222                                 }
1223                         } else {
1224                                 /* remove the RR from the rrset */
1225                                 if(!rrset_remove_rr(rrset, index))
1226                                         return 0;
1227                         }
1228                         return 1;
1229                 }
1230                 /* rr not found in rrset */
1231         }
1232
1233         /* is it a type RRSIG, look under the covered type */
1234         if(rr_type == LDNS_RR_TYPE_RRSIG) {
1235                 uint16_t ctype = rrsig_rdata_get_type_covered(rdata, rdatalen);
1236                 if((rrset=az_domain_rrset(node, ctype))!= NULL) {
1237                         if(az_rrset_find_rrsig(rrset->data, rdata, rdatalen,
1238                                 &index)) {
1239                                 /* rrsig should have d->count > 0, be
1240                                  * over some rr of that type */
1241                                 /* remove the rrsig from the rrsigs list of the
1242                                  * rrset */
1243                                 if(!rrset_remove_rr(rrset, index))
1244                                         return 0;
1245                                 return 1;
1246                         }
1247                 }
1248                 /* also RRSIG not found */
1249         }
1250
1251         /* nothing found to delete */
1252         if(nonexist) *nonexist = 1;
1253         return 1;
1254 }
1255
1256 /** remove RR from zone, ignore if it does not exist, false on alloc failure*/
1257 static int
1258 az_remove_rr(struct auth_zone* z, uint8_t* rr, size_t rr_len,
1259         size_t dname_len, int* nonexist)
1260 {
1261         struct auth_data* node;
1262         uint8_t* dname = rr;
1263         uint16_t rr_type = sldns_wirerr_get_type(rr, rr_len, dname_len);
1264         uint16_t rr_class = sldns_wirerr_get_class(rr, rr_len, dname_len);
1265         size_t rdatalen = ((size_t)sldns_wirerr_get_rdatalen(rr, rr_len,
1266                 dname_len))+2;
1267         /* rdata points to rdata prefixed with uint16 rdatalength */
1268         uint8_t* rdata = sldns_wirerr_get_rdatawl(rr, rr_len, dname_len);
1269
1270         if(rr_class != z->dclass) {
1271                 log_err("wrong class for RR");
1272                 /* really also a nonexisting entry, because no records
1273                  * of that class in the zone, but return an error because
1274                  * getting records of the wrong class is a failure of the
1275                  * zone transfer */
1276                 return 0;
1277         }
1278         node = az_find_name(z, dname, dname_len);
1279         if(!node) {
1280                 /* node with that name does not exist */
1281                 /* nonexisting entry, because no such name */
1282                 *nonexist = 1;
1283                 return 1;
1284         }
1285         if(!az_domain_remove_rr(node, rr_type, rdata, rdatalen, nonexist)) {
1286                 /* alloc failure or so */
1287                 return 0;
1288         }
1289         /* remove the node, if necessary */
1290         /* an rrsets==NULL entry is not kept around for empty nonterminals,
1291          * and also parent nodes are not kept around, so we just delete it */
1292         if(node->rrsets == NULL) {
1293                 (void)rbtree_delete(&z->data, node);
1294                 auth_data_delete(node);
1295         }
1296         return 1;
1297 }
1298
1299 /** decompress an RR into the buffer where it'll be an uncompressed RR
1300  * with uncompressed dname and uncompressed rdata (dnames) */
1301 static int
1302 decompress_rr_into_buffer(struct sldns_buffer* buf, uint8_t* pkt,
1303         size_t pktlen, uint8_t* dname, uint16_t rr_type, uint16_t rr_class,
1304         uint32_t rr_ttl, uint8_t* rr_data, uint16_t rr_rdlen)
1305 {
1306         sldns_buffer pktbuf;
1307         size_t dname_len = 0;
1308         size_t rdlenpos;
1309         size_t rdlen;
1310         uint8_t* rd;
1311         const sldns_rr_descriptor* desc;
1312         sldns_buffer_init_frm_data(&pktbuf, pkt, pktlen);
1313         sldns_buffer_clear(buf);
1314
1315         /* decompress dname */
1316         sldns_buffer_set_position(&pktbuf,
1317                 (size_t)(dname - sldns_buffer_current(&pktbuf)));
1318         dname_len = pkt_dname_len(&pktbuf);
1319         if(dname_len == 0) return 0; /* parse fail on dname */
1320         if(!sldns_buffer_available(buf, dname_len)) return 0;
1321         dname_pkt_copy(&pktbuf, sldns_buffer_current(buf), dname);
1322         sldns_buffer_skip(buf, (ssize_t)dname_len);
1323
1324         /* type, class, ttl and rdatalength fields */
1325         if(!sldns_buffer_available(buf, 10)) return 0;
1326         sldns_buffer_write_u16(buf, rr_type);
1327         sldns_buffer_write_u16(buf, rr_class);
1328         sldns_buffer_write_u32(buf, rr_ttl);
1329         rdlenpos = sldns_buffer_position(buf);
1330         sldns_buffer_write_u16(buf, 0); /* rd length position */
1331
1332         /* decompress rdata */
1333         desc = sldns_rr_descript(rr_type);
1334         rd = rr_data;
1335         rdlen = rr_rdlen;
1336         if(rdlen > 0 && desc && desc->_dname_count > 0) {
1337                 int count = (int)desc->_dname_count;
1338                 int rdf = 0;
1339                 size_t len; /* how much rdata to plain copy */
1340                 size_t uncompressed_len, compressed_len;
1341                 size_t oldpos;
1342                 /* decompress dnames. */
1343                 while(rdlen > 0 && count) {
1344                         switch(desc->_wireformat[rdf]) {
1345                         case LDNS_RDF_TYPE_DNAME:
1346                                 sldns_buffer_set_position(&pktbuf,
1347                                         (size_t)(rd -
1348                                         sldns_buffer_begin(&pktbuf)));
1349                                 oldpos = sldns_buffer_position(&pktbuf);
1350                                 /* moves pktbuf to right after the
1351                                  * compressed dname, and returns uncompressed
1352                                  * dname length */
1353                                 uncompressed_len = pkt_dname_len(&pktbuf);
1354                                 if(!uncompressed_len)
1355                                         return 0; /* parse error in dname */
1356                                 if(!sldns_buffer_available(buf,
1357                                         uncompressed_len))
1358                                         /* dname too long for buffer */
1359                                         return 0;
1360                                 dname_pkt_copy(&pktbuf,
1361                                         sldns_buffer_current(buf), rd);
1362                                 sldns_buffer_skip(buf, (ssize_t)uncompressed_len);
1363                                 compressed_len = sldns_buffer_position(
1364                                         &pktbuf) - oldpos;
1365                                 rd += compressed_len;
1366                                 rdlen -= compressed_len;
1367                                 count--;
1368                                 len = 0;
1369                                 break;
1370                         case LDNS_RDF_TYPE_STR:
1371                                 len = rd[0] + 1;
1372                                 break;
1373                         default:
1374                                 len = get_rdf_size(desc->_wireformat[rdf]);
1375                                 break;
1376                         }
1377                         if(len) {
1378                                 if(!sldns_buffer_available(buf, len))
1379                                         return 0; /* too long for buffer */
1380                                 sldns_buffer_write(buf, rd, len);
1381                                 rd += len;
1382                                 rdlen -= len;
1383                         }
1384                         rdf++;
1385                 }
1386         }
1387         /* copy remaining data */
1388         if(rdlen > 0) {
1389                 if(!sldns_buffer_available(buf, rdlen)) return 0;
1390                 sldns_buffer_write(buf, rd, rdlen);
1391         }
1392         /* fixup rdlength */
1393         sldns_buffer_write_u16_at(buf, rdlenpos,
1394                 sldns_buffer_position(buf)-rdlenpos-2);
1395         sldns_buffer_flip(buf);
1396         return 1;
1397 }
1398
1399 /** insert RR into zone, from packet, decompress RR,
1400  * if duplicate is nonNULL set the flag but otherwise ignore duplicates */
1401 static int
1402 az_insert_rr_decompress(struct auth_zone* z, uint8_t* pkt, size_t pktlen,
1403         struct sldns_buffer* scratch_buffer, uint8_t* dname, uint16_t rr_type,
1404         uint16_t rr_class, uint32_t rr_ttl, uint8_t* rr_data,
1405         uint16_t rr_rdlen, int* duplicate)
1406 {
1407         uint8_t* rr;
1408         size_t rr_len;
1409         size_t dname_len;
1410         if(!decompress_rr_into_buffer(scratch_buffer, pkt, pktlen, dname,
1411                 rr_type, rr_class, rr_ttl, rr_data, rr_rdlen)) {
1412                 log_err("could not decompress RR");
1413                 return 0;
1414         }
1415         rr = sldns_buffer_begin(scratch_buffer);
1416         rr_len = sldns_buffer_limit(scratch_buffer);
1417         dname_len = dname_valid(rr, rr_len);
1418         return az_insert_rr(z, rr, rr_len, dname_len, duplicate);
1419 }
1420
1421 /** remove RR from zone, from packet, decompress RR,
1422  * if nonexist is nonNULL set the flag but otherwise ignore nonexisting entries*/
1423 static int
1424 az_remove_rr_decompress(struct auth_zone* z, uint8_t* pkt, size_t pktlen,
1425         struct sldns_buffer* scratch_buffer, uint8_t* dname, uint16_t rr_type,
1426         uint16_t rr_class, uint32_t rr_ttl, uint8_t* rr_data,
1427         uint16_t rr_rdlen, int* nonexist)
1428 {
1429         uint8_t* rr;
1430         size_t rr_len;
1431         size_t dname_len;
1432         if(!decompress_rr_into_buffer(scratch_buffer, pkt, pktlen, dname,
1433                 rr_type, rr_class, rr_ttl, rr_data, rr_rdlen)) {
1434                 log_err("could not decompress RR");
1435                 return 0;
1436         }
1437         rr = sldns_buffer_begin(scratch_buffer);
1438         rr_len = sldns_buffer_limit(scratch_buffer);
1439         dname_len = dname_valid(rr, rr_len);
1440         return az_remove_rr(z, rr, rr_len, dname_len, nonexist);
1441 }
1442
1443 /**
1444  * Parse zonefile
1445  * @param z: zone to read in.
1446  * @param in: file to read from (just opened).
1447  * @param rr: buffer to use for RRs, 64k.
1448  *      passed so that recursive includes can use the same buffer and do
1449  *      not grow the stack too much.
1450  * @param rrbuflen: sizeof rr buffer.
1451  * @param state: parse state with $ORIGIN, $TTL and 'prev-dname' and so on,
1452  *      that is kept between includes.
1453  *      The lineno is set at 1 and then increased by the function.
1454  * @param fname: file name.
1455  * @param depth: recursion depth for includes
1456  * @param cfg: config for chroot.
1457  * returns false on failure, has printed an error message
1458  */
1459 static int
1460 az_parse_file(struct auth_zone* z, FILE* in, uint8_t* rr, size_t rrbuflen,
1461         struct sldns_file_parse_state* state, char* fname, int depth,
1462         struct config_file* cfg)
1463 {
1464         size_t rr_len, dname_len;
1465         int status;
1466         state->lineno = 1;
1467
1468         while(!feof(in)) {
1469                 rr_len = rrbuflen;
1470                 dname_len = 0;
1471                 status = sldns_fp2wire_rr_buf(in, rr, &rr_len, &dname_len,
1472                         state);
1473                 if(status == LDNS_WIREPARSE_ERR_INCLUDE && rr_len == 0) {
1474                         /* we have $INCLUDE or $something */
1475                         if(strncmp((char*)rr, "$INCLUDE ", 9) == 0 ||
1476                            strncmp((char*)rr, "$INCLUDE\t", 9) == 0) {
1477                                 FILE* inc;
1478                                 int lineno_orig = state->lineno;
1479                                 char* incfile = (char*)rr + 8;
1480                                 if(depth > MAX_INCLUDE_DEPTH) {
1481                                         log_err("%s:%d max include depth"
1482                                           "exceeded", fname, state->lineno);
1483                                         return 0;
1484                                 }
1485                                 /* skip spaces */
1486                                 while(*incfile == ' ' || *incfile == '\t')
1487                                         incfile++;
1488                                 /* adjust for chroot on include file */
1489                                 if(cfg->chrootdir && cfg->chrootdir[0] &&
1490                                         strncmp(incfile, cfg->chrootdir,
1491                                                 strlen(cfg->chrootdir)) == 0)
1492                                         incfile += strlen(cfg->chrootdir);
1493                                 incfile = strdup(incfile);
1494                                 if(!incfile) {
1495                                         log_err("malloc failure");
1496                                         return 0;
1497                                 }
1498                                 verbose(VERB_ALGO, "opening $INCLUDE %s",
1499                                         incfile);
1500                                 inc = fopen(incfile, "r");
1501                                 if(!inc) {
1502                                         log_err("%s:%d cannot open include "
1503                                                 "file %s: %s", fname,
1504                                                 lineno_orig, incfile,
1505                                                 strerror(errno));
1506                                         free(incfile);
1507                                         return 0;
1508                                 }
1509                                 /* recurse read that file now */
1510                                 if(!az_parse_file(z, inc, rr, rrbuflen,
1511                                         state, incfile, depth+1, cfg)) {
1512                                         log_err("%s:%d cannot parse include "
1513                                                 "file %s", fname,
1514                                                 lineno_orig, incfile);
1515                                         fclose(inc);
1516                                         free(incfile);
1517                                         return 0;
1518                                 }
1519                                 fclose(inc);
1520                                 verbose(VERB_ALGO, "done with $INCLUDE %s",
1521                                         incfile);
1522                                 free(incfile);
1523                                 state->lineno = lineno_orig;
1524                         }
1525                         continue;
1526                 }
1527                 if(status != 0) {
1528                         log_err("parse error %s %d:%d: %s", fname,
1529                                 state->lineno, LDNS_WIREPARSE_OFFSET(status),
1530                                 sldns_get_errorstr_parse(status));
1531                         return 0;
1532                 }
1533                 if(rr_len == 0) {
1534                         /* EMPTY line, TTL or ORIGIN */
1535                         continue;
1536                 }
1537                 /* insert wirerr in rrbuf */
1538                 if(!az_insert_rr(z, rr, rr_len, dname_len, NULL)) {
1539                         char buf[17];
1540                         sldns_wire2str_type_buf(sldns_wirerr_get_type(rr,
1541                                 rr_len, dname_len), buf, sizeof(buf));
1542                         log_err("%s:%d cannot insert RR of type %s",
1543                                 fname, state->lineno, buf);
1544                         return 0;
1545                 }
1546         }
1547         return 1;
1548 }
1549
1550 int
1551 auth_zone_read_zonefile(struct auth_zone* z, struct config_file* cfg)
1552 {
1553         uint8_t rr[LDNS_RR_BUF_SIZE];
1554         struct sldns_file_parse_state state;
1555         char* zfilename;
1556         FILE* in;
1557         if(!z || !z->zonefile || z->zonefile[0]==0)
1558                 return 1; /* no file, or "", nothing to read */
1559
1560         zfilename = z->zonefile;
1561         if(cfg->chrootdir && cfg->chrootdir[0] && strncmp(zfilename,
1562                 cfg->chrootdir, strlen(cfg->chrootdir)) == 0)
1563                 zfilename += strlen(cfg->chrootdir);
1564         if(verbosity >= VERB_ALGO) {
1565                 char nm[255+1];
1566                 dname_str(z->name, nm);
1567                 verbose(VERB_ALGO, "read zonefile %s for %s", zfilename, nm);
1568         }
1569         in = fopen(zfilename, "r");
1570         if(!in) {
1571                 char* n = sldns_wire2str_dname(z->name, z->namelen);
1572                 if(z->zone_is_slave && errno == ENOENT) {
1573                         /* we fetch the zone contents later, no file yet */
1574                         verbose(VERB_ALGO, "no zonefile %s for %s",
1575                                 zfilename, n?n:"error");
1576                         free(n);
1577                         return 1;
1578                 }
1579                 log_err("cannot open zonefile %s for %s: %s",
1580                         zfilename, n?n:"error", strerror(errno));
1581                 free(n);
1582                 return 0;
1583         }
1584
1585         /* clear the data tree */
1586         traverse_postorder(&z->data, auth_data_del, NULL);
1587         rbtree_init(&z->data, &auth_data_cmp);
1588
1589         memset(&state, 0, sizeof(state));
1590         /* default TTL to 3600 */
1591         state.default_ttl = 3600;
1592         /* set $ORIGIN to the zone name */
1593         if(z->namelen <= sizeof(state.origin)) {
1594                 memcpy(state.origin, z->name, z->namelen);
1595                 state.origin_len = z->namelen;
1596         }
1597         /* parse the (toplevel) file */
1598         if(!az_parse_file(z, in, rr, sizeof(rr), &state, zfilename, 0, cfg)) {
1599                 char* n = sldns_wire2str_dname(z->name, z->namelen);
1600                 log_err("error parsing zonefile %s for %s",
1601                         zfilename, n?n:"error");
1602                 free(n);
1603                 fclose(in);
1604                 return 0;
1605         }
1606         fclose(in);
1607         return 1;
1608 }
1609
1610 /** write buffer to file and check return codes */
1611 static int
1612 write_out(FILE* out, const char* str, size_t len)
1613 {
1614         size_t r;
1615         if(len == 0)
1616                 return 1;
1617         r = fwrite(str, 1, len, out);
1618         if(r == 0) {
1619                 log_err("write failed: %s", strerror(errno));
1620                 return 0;
1621         } else if(r < len) {
1622                 log_err("write failed: too short (disk full?)");
1623                 return 0;
1624         }
1625         return 1;
1626 }
1627
1628 /** convert auth rr to string */
1629 static int
1630 auth_rr_to_string(uint8_t* nm, size_t nmlen, uint16_t tp, uint16_t cl,
1631         struct packed_rrset_data* data, size_t i, char* s, size_t buflen)
1632 {
1633         int w = 0;
1634         size_t slen = buflen, datlen;
1635         uint8_t* dat;
1636         if(i >= data->count) tp = LDNS_RR_TYPE_RRSIG;
1637         dat = nm;
1638         datlen = nmlen;
1639         w += sldns_wire2str_dname_scan(&dat, &datlen, &s, &slen, NULL, 0);
1640         w += sldns_str_print(&s, &slen, "\t");
1641         w += sldns_str_print(&s, &slen, "%lu\t", (unsigned long)data->rr_ttl[i]);
1642         w += sldns_wire2str_class_print(&s, &slen, cl);
1643         w += sldns_str_print(&s, &slen, "\t");
1644         w += sldns_wire2str_type_print(&s, &slen, tp);
1645         w += sldns_str_print(&s, &slen, "\t");
1646         datlen = data->rr_len[i]-2;
1647         dat = data->rr_data[i]+2;
1648         w += sldns_wire2str_rdata_scan(&dat, &datlen, &s, &slen, tp, NULL, 0);
1649
1650         if(tp == LDNS_RR_TYPE_DNSKEY) {
1651                 w += sldns_str_print(&s, &slen, " ;{id = %u}",
1652                         sldns_calc_keytag_raw(data->rr_data[i]+2,
1653                                 data->rr_len[i]-2));
1654         }
1655         w += sldns_str_print(&s, &slen, "\n");
1656
1657         if(w > (int)buflen) {
1658                 log_nametypeclass(0, "RR too long to print", nm, tp, cl);
1659                 return 0;
1660         }
1661         return 1;
1662 }
1663
1664 /** write rrset to file */
1665 static int
1666 auth_zone_write_rrset(struct auth_zone* z, struct auth_data* node,
1667         struct auth_rrset* r, FILE* out)
1668 {
1669         size_t i, count = r->data->count + r->data->rrsig_count;
1670         char buf[LDNS_RR_BUF_SIZE];
1671         for(i=0; i<count; i++) {
1672                 if(!auth_rr_to_string(node->name, node->namelen, r->type,
1673                         z->dclass, r->data, i, buf, sizeof(buf))) {
1674                         verbose(VERB_ALGO, "failed to rr2str rr %d", (int)i);
1675                         continue;
1676                 }
1677                 if(!write_out(out, buf, strlen(buf)))
1678                         return 0;
1679         }
1680         return 1;
1681 }
1682
1683 /** write domain to file */
1684 static int
1685 auth_zone_write_domain(struct auth_zone* z, struct auth_data* n, FILE* out)
1686 {
1687         struct auth_rrset* r;
1688         /* if this is zone apex, write SOA first */
1689         if(z->namelen == n->namelen) {
1690                 struct auth_rrset* soa = az_domain_rrset(n, LDNS_RR_TYPE_SOA);
1691                 if(soa) {
1692                         if(!auth_zone_write_rrset(z, n, soa, out))
1693                                 return 0;
1694                 }
1695         }
1696         /* write all the RRsets for this domain */
1697         for(r = n->rrsets; r; r = r->next) {
1698                 if(z->namelen == n->namelen &&
1699                         r->type == LDNS_RR_TYPE_SOA)
1700                         continue; /* skip SOA here */
1701                 if(!auth_zone_write_rrset(z, n, r, out))
1702                         return 0;
1703         }
1704         return 1;
1705 }
1706
1707 int auth_zone_write_file(struct auth_zone* z, const char* fname)
1708 {
1709         FILE* out;
1710         struct auth_data* n;
1711         out = fopen(fname, "w");
1712         if(!out) {
1713                 log_err("could not open %s: %s", fname, strerror(errno));
1714                 return 0;
1715         }
1716         RBTREE_FOR(n, struct auth_data*, &z->data) {
1717                 if(!auth_zone_write_domain(z, n, out)) {
1718                         log_err("could not write domain to %s", fname);
1719                         fclose(out);
1720                         return 0;
1721                 }
1722         }
1723         fclose(out);
1724         return 1;
1725 }
1726
1727 /** read all auth zones from file (if they have) */
1728 static int
1729 auth_zones_read_zones(struct auth_zones* az, struct config_file* cfg)
1730 {
1731         struct auth_zone* z;
1732         lock_rw_wrlock(&az->lock);
1733         RBTREE_FOR(z, struct auth_zone*, &az->ztree) {
1734                 lock_rw_wrlock(&z->lock);
1735                 if(!auth_zone_read_zonefile(z, cfg)) {
1736                         lock_rw_unlock(&z->lock);
1737                         lock_rw_unlock(&az->lock);
1738                         return 0;
1739                 }
1740                 lock_rw_unlock(&z->lock);
1741         }
1742         lock_rw_unlock(&az->lock);
1743         return 1;
1744 }
1745
1746 /** find serial number of zone or false if none */
1747 int
1748 auth_zone_get_serial(struct auth_zone* z, uint32_t* serial)
1749 {
1750         struct auth_data* apex;
1751         struct auth_rrset* soa;
1752         struct packed_rrset_data* d;
1753         apex = az_find_name(z, z->name, z->namelen);
1754         if(!apex) return 0;
1755         soa = az_domain_rrset(apex, LDNS_RR_TYPE_SOA);
1756         if(!soa || soa->data->count==0)
1757                 return 0; /* no RRset or no RRs in rrset */
1758         if(soa->data->rr_len[0] < 2+4*5) return 0; /* SOA too short */
1759         d = soa->data;
1760         *serial = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-20));
1761         return 1;
1762 }
1763
1764 /** Find auth_zone SOA and populate the values in xfr(soa values). */
1765 static int
1766 xfr_find_soa(struct auth_zone* z, struct auth_xfer* xfr)
1767 {
1768         struct auth_data* apex;
1769         struct auth_rrset* soa;
1770         struct packed_rrset_data* d;
1771         apex = az_find_name(z, z->name, z->namelen);
1772         if(!apex) return 0;
1773         soa = az_domain_rrset(apex, LDNS_RR_TYPE_SOA);
1774         if(!soa || soa->data->count==0)
1775                 return 0; /* no RRset or no RRs in rrset */
1776         if(soa->data->rr_len[0] < 2+4*5) return 0; /* SOA too short */
1777         /* SOA record ends with serial, refresh, retry, expiry, minimum,
1778          * as 4 byte fields */
1779         d = soa->data;
1780         xfr->have_zone = 1;
1781         xfr->serial = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-20));
1782         xfr->refresh = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-16));
1783         xfr->retry = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-12));
1784         xfr->expiry = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-8));
1785         /* soa minimum at d->rr_len[0]-4 */
1786         return 1;
1787 }
1788
1789 /**
1790  * Setup auth_xfer zone
1791  * This populates the have_zone, soa values, and so on times.
1792  * Doesn't do network traffic yet, can set option flags.
1793  * @param z: locked by caller, and modified for setup
1794  * @param x: locked by caller, and modified.
1795  * @return false on failure.
1796  */
1797 static int
1798 auth_xfer_setup(struct auth_zone* z, struct auth_xfer* x)
1799 {
1800         /* for a zone without zone transfers, x==NULL, so skip them,
1801          * i.e. the zone config is fixed with no masters or urls */
1802         if(!z || !x) return 1;
1803         if(!xfr_find_soa(z, x)) {
1804                 return 1;
1805         }
1806         /* nothing for probe, nextprobe and transfer tasks */
1807         return 1;
1808 }
1809
1810 /**
1811  * Setup all zones
1812  * @param az: auth zones structure
1813  * @return false on failure.
1814  */
1815 static int
1816 auth_zones_setup_zones(struct auth_zones* az)
1817 {
1818         struct auth_zone* z;
1819         struct auth_xfer* x;
1820         lock_rw_wrlock(&az->lock);
1821         RBTREE_FOR(z, struct auth_zone*, &az->ztree) {
1822                 lock_rw_wrlock(&z->lock);
1823                 x = auth_xfer_find(az, z->name, z->namelen, z->dclass);
1824                 if(x) {
1825                         lock_basic_lock(&x->lock);
1826                 }
1827                 if(!auth_xfer_setup(z, x)) {
1828                         if(x) {
1829                                 lock_basic_unlock(&x->lock);
1830                         }
1831                         lock_rw_unlock(&z->lock);
1832                         lock_rw_unlock(&az->lock);
1833                         return 0;
1834                 }
1835                 if(x) {
1836                         lock_basic_unlock(&x->lock);
1837                 }
1838                 lock_rw_unlock(&z->lock);
1839         }
1840         lock_rw_unlock(&az->lock);
1841         return 1;
1842 }
1843
1844 /** set config items and create zones */
1845 static int
1846 auth_zones_cfg(struct auth_zones* az, struct config_auth* c)
1847 {
1848         struct auth_zone* z;
1849         struct auth_xfer* x = NULL;
1850
1851         /* create zone */
1852         lock_rw_wrlock(&az->lock);
1853         if(!(z=auth_zones_find_or_add_zone(az, c->name))) {
1854                 lock_rw_unlock(&az->lock);
1855                 return 0;
1856         }
1857         if(c->masters || c->urls) {
1858                 if(!(x=auth_zones_find_or_add_xfer(az, z))) {
1859                         lock_rw_unlock(&az->lock);
1860                         lock_rw_unlock(&z->lock);
1861                         return 0;
1862                 }
1863         }
1864         if(c->for_downstream)
1865                 az->have_downstream = 1;
1866         lock_rw_unlock(&az->lock);
1867
1868         /* set options */
1869         z->zone_deleted = 0;
1870         if(!auth_zone_set_zonefile(z, c->zonefile)) {
1871                 if(x) {
1872                         lock_basic_unlock(&x->lock);
1873                 }
1874                 lock_rw_unlock(&z->lock);
1875                 return 0;
1876         }
1877         z->for_downstream = c->for_downstream;
1878         z->for_upstream = c->for_upstream;
1879         z->fallback_enabled = c->fallback_enabled;
1880
1881         /* xfer zone */
1882         if(x) {
1883                 z->zone_is_slave = 1;
1884                 /* set options on xfer zone */
1885                 if(!xfer_set_masters(&x->task_probe->masters, c, 0)) {
1886                         lock_basic_unlock(&x->lock);
1887                         lock_rw_unlock(&z->lock);
1888                         return 0;
1889                 }
1890                 if(!xfer_set_masters(&x->task_transfer->masters, c, 1)) {
1891                         lock_basic_unlock(&x->lock);
1892                         lock_rw_unlock(&z->lock);
1893                         return 0;
1894                 }
1895                 lock_basic_unlock(&x->lock);
1896         }
1897
1898         lock_rw_unlock(&z->lock);
1899         return 1;
1900 }
1901
1902 /** set all auth zones deleted, then in auth_zones_cfg, it marks them
1903  * as nondeleted (if they are still in the config), and then later
1904  * we can find deleted zones */
1905 static void
1906 az_setall_deleted(struct auth_zones* az)
1907 {
1908         struct auth_zone* z;
1909         lock_rw_wrlock(&az->lock);
1910         RBTREE_FOR(z, struct auth_zone*, &az->ztree) {
1911                 lock_rw_wrlock(&z->lock);
1912                 z->zone_deleted = 1;
1913                 lock_rw_unlock(&z->lock);
1914         }
1915         lock_rw_unlock(&az->lock);
1916 }
1917
1918 /** find zones that are marked deleted and delete them.
1919  * This is called from apply_cfg, and there are no threads and no
1920  * workers, so the xfr can just be deleted. */
1921 static void
1922 az_delete_deleted_zones(struct auth_zones* az)
1923 {
1924         struct auth_zone* z;
1925         struct auth_zone* delete_list = NULL, *next;
1926         struct auth_xfer* xfr;
1927         lock_rw_wrlock(&az->lock);
1928         RBTREE_FOR(z, struct auth_zone*, &az->ztree) {
1929                 lock_rw_wrlock(&z->lock);
1930                 if(z->zone_deleted) {
1931                         /* we cannot alter the rbtree right now, but
1932                          * we can put it on a linked list and then
1933                          * delete it */
1934                         z->delete_next = delete_list;
1935                         delete_list = z;
1936                 }
1937                 lock_rw_unlock(&z->lock);
1938         }
1939         /* now we are out of the tree loop and we can loop and delete
1940          * the zones */
1941         z = delete_list;
1942         while(z) {
1943                 next = z->delete_next;
1944                 xfr = auth_xfer_find(az, z->name, z->namelen, z->dclass);
1945                 if(xfr) {
1946                         (void)rbtree_delete(&az->xtree, &xfr->node);
1947                         auth_xfer_delete(xfr);
1948                 }
1949                 (void)rbtree_delete(&az->ztree, &z->node);
1950                 auth_zone_delete(z);
1951                 z = next;
1952         }
1953         lock_rw_unlock(&az->lock);
1954 }
1955
1956 int auth_zones_apply_cfg(struct auth_zones* az, struct config_file* cfg,
1957         int setup)
1958 {
1959         struct config_auth* p;
1960         az_setall_deleted(az);
1961         for(p = cfg->auths; p; p = p->next) {
1962                 if(!p->name || p->name[0] == 0) {
1963                         log_warn("auth-zone without a name, skipped");
1964                         continue;
1965                 }
1966                 if(!auth_zones_cfg(az, p)) {
1967                         log_err("cannot config auth zone %s", p->name);
1968                         return 0;
1969                 }
1970         }
1971         az_delete_deleted_zones(az);
1972         if(!auth_zones_read_zones(az, cfg))
1973                 return 0;
1974         if(setup) {
1975                 if(!auth_zones_setup_zones(az))
1976                         return 0;
1977         }
1978         return 1;
1979 }
1980
1981 /** delete chunks
1982  * @param at: transfer structure with chunks list.  The chunks and their
1983  *      data are freed.
1984  */
1985 static void
1986 auth_chunks_delete(struct auth_transfer* at)
1987 {
1988         if(at->chunks_first) {
1989                 struct auth_chunk* c, *cn;
1990                 c = at->chunks_first;
1991                 while(c) {
1992                         cn = c->next;
1993                         free(c->data);
1994                         free(c);
1995                         c = cn;
1996                 }
1997         }
1998         at->chunks_first = NULL;
1999         at->chunks_last = NULL;
2000 }
2001
2002 /** free master addr list */
2003 static void
2004 auth_free_master_addrs(struct auth_addr* list)
2005 {
2006         struct auth_addr *n;
2007         while(list) {
2008                 n = list->next;
2009                 free(list);
2010                 list = n;
2011         }
2012 }
2013
2014 /** free the masters list */
2015 static void
2016 auth_free_masters(struct auth_master* list)
2017 {
2018         struct auth_master* n;
2019         while(list) {
2020                 n = list->next;
2021                 auth_free_master_addrs(list->list);
2022                 free(list->host);
2023                 free(list->file);
2024                 free(list);
2025                 list = n;
2026         }
2027 }
2028
2029 /** delete auth xfer structure
2030  * @param xfr: delete this xfer and its tasks.
2031  */
2032 static void
2033 auth_xfer_delete(struct auth_xfer* xfr)
2034 {
2035         if(!xfr) return;
2036         lock_basic_destroy(&xfr->lock);
2037         free(xfr->name);
2038         if(xfr->task_nextprobe) {
2039                 comm_timer_delete(xfr->task_nextprobe->timer);
2040                 free(xfr->task_nextprobe);
2041         }
2042         if(xfr->task_probe) {
2043                 auth_free_masters(xfr->task_probe->masters);
2044                 comm_point_delete(xfr->task_probe->cp);
2045                 comm_timer_delete(xfr->task_probe->timer);
2046                 free(xfr->task_probe);
2047         }
2048         if(xfr->task_transfer) {
2049                 auth_free_masters(xfr->task_transfer->masters);
2050                 comm_point_delete(xfr->task_transfer->cp);
2051                 comm_timer_delete(xfr->task_transfer->timer);
2052                 if(xfr->task_transfer->chunks_first) {
2053                         auth_chunks_delete(xfr->task_transfer);
2054                 }
2055                 free(xfr->task_transfer);
2056         }
2057         auth_free_masters(xfr->allow_notify_list);
2058         free(xfr);
2059 }
2060
2061 /** helper traverse to delete zones */
2062 static void
2063 auth_zone_del(rbnode_type* n, void* ATTR_UNUSED(arg))
2064 {
2065         struct auth_zone* z = (struct auth_zone*)n->key;
2066         auth_zone_delete(z);
2067 }
2068
2069 /** helper traverse to delete xfer zones */
2070 static void
2071 auth_xfer_del(rbnode_type* n, void* ATTR_UNUSED(arg))
2072 {
2073         struct auth_xfer* z = (struct auth_xfer*)n->key;
2074         auth_xfer_delete(z);
2075 }
2076
2077 void auth_zones_delete(struct auth_zones* az)
2078 {
2079         if(!az) return;
2080         lock_rw_destroy(&az->lock);
2081         traverse_postorder(&az->ztree, auth_zone_del, NULL);
2082         traverse_postorder(&az->xtree, auth_xfer_del, NULL);
2083         free(az);
2084 }
2085
2086 /** true if domain has only nsec3 */
2087 static int
2088 domain_has_only_nsec3(struct auth_data* n)
2089 {
2090         struct auth_rrset* rrset = n->rrsets;
2091         int nsec3_seen = 0;
2092         while(rrset) {
2093                 if(rrset->type == LDNS_RR_TYPE_NSEC3) {
2094                         nsec3_seen = 1;
2095                 } else if(rrset->type != LDNS_RR_TYPE_RRSIG) {
2096                         return 0;
2097                 }
2098                 rrset = rrset->next;
2099         }
2100         return nsec3_seen;
2101 }
2102
2103 /** see if the domain has a wildcard child '*.domain' */
2104 static struct auth_data*
2105 az_find_wildcard_domain(struct auth_zone* z, uint8_t* nm, size_t nmlen)
2106 {
2107         uint8_t wc[LDNS_MAX_DOMAINLEN];
2108         if(nmlen+2 > sizeof(wc))
2109                 return NULL; /* result would be too long */
2110         wc[0] = 1; /* length of wildcard label */
2111         wc[1] = (uint8_t)'*'; /* wildcard label */
2112         memmove(wc+2, nm, nmlen);
2113         return az_find_name(z, wc, nmlen+2);
2114 }
2115
2116 /** find wildcard between qname and cename */
2117 static struct auth_data*
2118 az_find_wildcard(struct auth_zone* z, struct query_info* qinfo,
2119         struct auth_data* ce)
2120 {
2121         uint8_t* nm = qinfo->qname;
2122         size_t nmlen = qinfo->qname_len;
2123         struct auth_data* node;
2124         if(!dname_subdomain_c(nm, z->name))
2125                 return NULL; /* out of zone */
2126         while((node=az_find_wildcard_domain(z, nm, nmlen))==NULL) {
2127                 /* see if we can go up to find the wildcard */
2128                 if(nmlen == z->namelen)
2129                         return NULL; /* top of zone reached */
2130                 if(ce && nmlen == ce->namelen)
2131                         return NULL; /* ce reached */
2132                 if(dname_is_root(nm))
2133                         return NULL; /* cannot go up */
2134                 dname_remove_label(&nm, &nmlen);
2135         }
2136         return node;
2137 }
2138
2139 /** domain is not exact, find first candidate ce (name that matches
2140  * a part of qname) in tree */
2141 static struct auth_data*
2142 az_find_candidate_ce(struct auth_zone* z, struct query_info* qinfo,
2143         struct auth_data* n)
2144 {
2145         uint8_t* nm;
2146         size_t nmlen;
2147         if(n) {
2148                 nm = dname_get_shared_topdomain(qinfo->qname, n->name);
2149         } else {
2150                 nm = qinfo->qname;
2151         }
2152         dname_count_size_labels(nm, &nmlen);
2153         n = az_find_name(z, nm, nmlen);
2154         /* delete labels and go up on name */
2155         while(!n) {
2156                 if(dname_is_root(nm))
2157                         return NULL; /* cannot go up */
2158                 dname_remove_label(&nm, &nmlen);
2159                 n = az_find_name(z, nm, nmlen);
2160         }
2161         return n;
2162 }
2163
2164 /** go up the auth tree to next existing name. */
2165 static struct auth_data*
2166 az_domain_go_up(struct auth_zone* z, struct auth_data* n)
2167 {
2168         uint8_t* nm = n->name;
2169         size_t nmlen = n->namelen;
2170         while(!dname_is_root(nm)) {
2171                 dname_remove_label(&nm, &nmlen);
2172                 if((n=az_find_name(z, nm, nmlen)) != NULL)
2173                         return n;
2174         }
2175         return NULL;
2176 }
2177
2178 /** Find the closest encloser, an name that exists and is above the
2179  * qname.
2180  * return true if the node (param node) is existing, nonobscured and
2181  *      can be used to generate answers from.  It is then also node_exact.
2182  * returns false if the node is not good enough (or it wasn't node_exact)
2183  *      in this case the ce can be filled.
2184  *      if ce is NULL, no ce exists, and likely the zone is completely empty,
2185  *      not even with a zone apex.
2186  *      if ce is nonNULL it is the closest enclosing upper name (that exists
2187  *      itself for answer purposes).  That name may have DNAME, NS or wildcard
2188  *      rrset is the closest DNAME or NS rrset that was found.
2189  */
2190 static int
2191 az_find_ce(struct auth_zone* z, struct query_info* qinfo,
2192         struct auth_data* node, int node_exact, struct auth_data** ce,
2193         struct auth_rrset** rrset)
2194 {
2195         struct auth_data* n = node;
2196         *ce = NULL;
2197         *rrset = NULL;
2198         if(!node_exact) {
2199                 /* if not exact, lookup closest exact match */
2200                 n = az_find_candidate_ce(z, qinfo, n);
2201         } else {
2202                 /* if exact, the node itself is the first candidate ce */
2203                 *ce = n;
2204         }
2205
2206         /* no direct answer from nsec3-only domains */
2207         if(n && domain_has_only_nsec3(n)) {
2208                 node_exact = 0;
2209                 *ce = NULL;
2210         }
2211
2212         /* with exact matches, walk up the labels until we find the
2213          * delegation, or DNAME or zone end */
2214         while(n) {
2215                 /* see if the current candidate has issues */
2216                 /* not zone apex and has type NS */
2217                 if(n->namelen != z->namelen &&
2218                         (*rrset=az_domain_rrset(n, LDNS_RR_TYPE_NS)) &&
2219                         /* delegate here, but DS at exact the dp has notype */
2220                         (qinfo->qtype != LDNS_RR_TYPE_DS ||
2221                         n->namelen != qinfo->qname_len)) {
2222                         /* referral */
2223                         /* this is ce and the lowernode is nonexisting */
2224                         *ce = n;
2225                         return 0;
2226                 }
2227                 /* not equal to qname and has type DNAME */
2228                 if(n->namelen != qinfo->qname_len &&
2229                         (*rrset=az_domain_rrset(n, LDNS_RR_TYPE_DNAME))) {
2230                         /* this is ce and the lowernode is nonexisting */
2231                         *ce = n;
2232                         return 0;
2233                 }
2234
2235                 if(*ce == NULL && !domain_has_only_nsec3(n)) {
2236                         /* if not found yet, this exact name must be
2237                          * our lowest match (but not nsec3onlydomain) */
2238                         *ce = n;
2239                 }
2240
2241                 /* walk up the tree by removing labels from name and lookup */
2242                 n = az_domain_go_up(z, n);
2243         }
2244         /* found no problems, if it was an exact node, it is fine to use */
2245         return node_exact;
2246 }
2247
2248 /** add additional A/AAAA from domain names in rrset rdata (+offset)
2249  * offset is number of bytes in rdata where the dname is located. */
2250 static int
2251 az_add_additionals_from(struct auth_zone* z, struct regional* region,
2252         struct dns_msg* msg, struct auth_rrset* rrset, size_t offset)
2253 {
2254         struct packed_rrset_data* d = rrset->data;
2255         size_t i;
2256         if(!d) return 0;
2257         for(i=0; i<d->count; i++) {
2258                 size_t dlen;
2259                 struct auth_data* domain;
2260                 struct auth_rrset* ref;
2261                 if(d->rr_len[i] < 2+offset)
2262                         continue; /* too short */
2263                 if(!(dlen = dname_valid(d->rr_data[i]+2+offset,
2264                         d->rr_len[i]-2-offset)))
2265                         continue; /* malformed */
2266                 domain = az_find_name(z, d->rr_data[i]+2+offset, dlen);
2267                 if(!domain)
2268                         continue;
2269                 if((ref=az_domain_rrset(domain, LDNS_RR_TYPE_A)) != NULL) {
2270                         if(!msg_add_rrset_ar(z, region, msg, domain, ref))
2271                                 return 0;
2272                 }
2273                 if((ref=az_domain_rrset(domain, LDNS_RR_TYPE_AAAA)) != NULL) {
2274                         if(!msg_add_rrset_ar(z, region, msg, domain, ref))
2275                                 return 0;
2276                 }
2277         }
2278         return 1;
2279 }
2280
2281 /** add negative SOA record (with negative TTL) */
2282 static int
2283 az_add_negative_soa(struct auth_zone* z, struct regional* region,
2284         struct dns_msg* msg)
2285 {
2286         uint32_t minimum;
2287         struct packed_rrset_data* d;
2288         struct auth_rrset* soa;
2289         struct auth_data* apex = az_find_name(z, z->name, z->namelen);
2290         if(!apex) return 0;
2291         soa = az_domain_rrset(apex, LDNS_RR_TYPE_SOA);
2292         if(!soa) return 0;
2293         /* must be first to put in message; we want to fix the TTL with
2294          * one RRset here, otherwise we'd need to loop over the RRs to get
2295          * the resulting lower TTL */
2296         log_assert(msg->rep->rrset_count == 0);
2297         if(!msg_add_rrset_ns(z, region, msg, apex, soa)) return 0;
2298         /* fixup TTL */
2299         d = (struct packed_rrset_data*)msg->rep->rrsets[msg->rep->rrset_count-1]->entry.data;
2300         /* last 4 bytes are minimum ttl in network format */
2301         if(d->count == 0) return 0;
2302         if(d->rr_len[0] < 2+4) return 0;
2303         minimum = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-4));
2304         d->ttl = (time_t)minimum;
2305         d->rr_ttl[0] = (time_t)minimum;
2306         msg->rep->ttl = get_rrset_ttl(msg->rep->rrsets[0]);
2307         msg->rep->prefetch_ttl = PREFETCH_TTL_CALC(msg->rep->ttl);
2308         msg->rep->serve_expired_ttl = msg->rep->ttl + SERVE_EXPIRED_TTL;
2309         return 1;
2310 }
2311
2312 /** See if the query goes to empty nonterminal (that has no auth_data,
2313  * but there are nodes underneath.  We already checked that there are
2314  * not NS, or DNAME above, so that we only need to check if some node
2315  * exists below (with nonempty rr list), return true if emptynonterminal */
2316 static int
2317 az_empty_nonterminal(struct auth_zone* z, struct query_info* qinfo,
2318         struct auth_data* node)
2319 {
2320         struct auth_data* next;
2321         if(!node) {
2322                 /* no smaller was found, use first (smallest) node as the
2323                  * next one */
2324                 next = (struct auth_data*)rbtree_first(&z->data);
2325         } else {
2326                 next = (struct auth_data*)rbtree_next(&node->node);
2327         }
2328         while(next && (rbnode_type*)next != RBTREE_NULL && next->rrsets == NULL) {
2329                 /* the next name has empty rrsets, is an empty nonterminal
2330                  * itself, see if there exists something below it */
2331                 next = (struct auth_data*)rbtree_next(&node->node);
2332         }
2333         if((rbnode_type*)next == RBTREE_NULL || !next) {
2334                 /* there is no next node, so something below it cannot
2335                  * exist */
2336                 return 0;
2337         }
2338         /* a next node exists, if there was something below the query,
2339          * this node has to be it.  See if it is below the query name */
2340         if(dname_strict_subdomain_c(next->name, qinfo->qname))
2341                 return 1;
2342         return 0;
2343 }
2344
2345 /** create synth cname target name in buffer, or fail if too long */
2346 static size_t
2347 synth_cname_buf(uint8_t* qname, size_t qname_len, size_t dname_len,
2348         uint8_t* dtarg, size_t dtarglen, uint8_t* buf, size_t buflen)
2349 {
2350         size_t newlen = qname_len + dtarglen - dname_len;
2351         if(newlen > buflen) {
2352                 /* YXDOMAIN error */
2353                 return 0;
2354         }
2355         /* new name is concatenation of qname front (without DNAME owner)
2356          * and DNAME target name */
2357         memcpy(buf, qname, qname_len-dname_len);
2358         memmove(buf+(qname_len-dname_len), dtarg, dtarglen);
2359         return newlen;
2360 }
2361
2362 /** create synthetic CNAME rrset for in a DNAME answer in region,
2363  * false on alloc failure, cname==NULL when name too long. */
2364 static int
2365 create_synth_cname(uint8_t* qname, size_t qname_len, struct regional* region,
2366         struct auth_data* node, struct auth_rrset* dname, uint16_t dclass,
2367         struct ub_packed_rrset_key** cname)
2368 {
2369         uint8_t buf[LDNS_MAX_DOMAINLEN];
2370         uint8_t* dtarg;
2371         size_t dtarglen, newlen;
2372         struct packed_rrset_data* d;
2373
2374         /* get DNAME target name */
2375         if(dname->data->count < 1) return 0;
2376         if(dname->data->rr_len[0] < 3) return 0; /* at least rdatalen +1 */
2377         dtarg = dname->data->rr_data[0]+2;
2378         dtarglen = dname->data->rr_len[0]-2;
2379         if(sldns_read_uint16(dname->data->rr_data[0]) != dtarglen)
2380                 return 0; /* rdatalen in DNAME rdata is malformed */
2381         if(dname_valid(dtarg, dtarglen) != dtarglen)
2382                 return 0; /* DNAME RR has malformed rdata */
2383
2384         /* synthesize a CNAME */
2385         newlen = synth_cname_buf(qname, qname_len, node->namelen,
2386                 dtarg, dtarglen, buf, sizeof(buf));
2387         if(newlen == 0) {
2388                 /* YXDOMAIN error */
2389                 *cname = NULL;
2390                 return 1;
2391         }
2392         *cname = (struct ub_packed_rrset_key*)regional_alloc(region,
2393                 sizeof(struct ub_packed_rrset_key));
2394         if(!*cname)
2395                 return 0; /* out of memory */
2396         memset(&(*cname)->entry, 0, sizeof((*cname)->entry));
2397         (*cname)->entry.key = (*cname);
2398         (*cname)->rk.type = htons(LDNS_RR_TYPE_CNAME);
2399         (*cname)->rk.rrset_class = htons(dclass);
2400         (*cname)->rk.flags = 0;
2401         (*cname)->rk.dname = regional_alloc_init(region, qname, qname_len);
2402         if(!(*cname)->rk.dname)
2403                 return 0; /* out of memory */
2404         (*cname)->rk.dname_len = qname_len;
2405         (*cname)->entry.hash = rrset_key_hash(&(*cname)->rk);
2406         d = (struct packed_rrset_data*)regional_alloc_zero(region,
2407                 sizeof(struct packed_rrset_data) + sizeof(size_t) +
2408                 sizeof(uint8_t*) + sizeof(time_t) + sizeof(uint16_t)
2409                 + newlen);
2410         if(!d)
2411                 return 0; /* out of memory */
2412         (*cname)->entry.data = d;
2413         d->ttl = 0; /* 0 for synthesized CNAME TTL */
2414         d->count = 1;
2415         d->rrsig_count = 0;
2416         d->trust = rrset_trust_ans_noAA;
2417         d->rr_len = (size_t*)((uint8_t*)d +
2418                 sizeof(struct packed_rrset_data));
2419         d->rr_len[0] = newlen + sizeof(uint16_t);
2420         packed_rrset_ptr_fixup(d);
2421         d->rr_ttl[0] = d->ttl;
2422         sldns_write_uint16(d->rr_data[0], newlen);
2423         memmove(d->rr_data[0] + sizeof(uint16_t), buf, newlen);
2424         return 1;
2425 }
2426
2427 /** add a synthesized CNAME to the answer section */
2428 static int
2429 add_synth_cname(struct auth_zone* z, uint8_t* qname, size_t qname_len,
2430         struct regional* region, struct dns_msg* msg, struct auth_data* dname,
2431         struct auth_rrset* rrset)
2432 {
2433         struct ub_packed_rrset_key* cname;
2434         /* synthesize a CNAME */
2435         if(!create_synth_cname(qname, qname_len, region, dname, rrset,
2436                 z->dclass, &cname)) {
2437                 /* out of memory */
2438                 return 0;
2439         }
2440         if(!cname) {
2441                 /* cname cannot be create because of YXDOMAIN */
2442                 msg->rep->flags |= LDNS_RCODE_YXDOMAIN;
2443                 return 1;
2444         }
2445         /* add cname to message */
2446         if(!msg_grow_array(region, msg))
2447                 return 0;
2448         msg->rep->rrsets[msg->rep->rrset_count] = cname;
2449         msg->rep->rrset_count++;
2450         msg->rep->an_numrrsets++;
2451         msg_ttl(msg);
2452         return 1;
2453 }
2454
2455 /** Change a dname to a different one, for wildcard namechange */
2456 static void
2457 az_change_dnames(struct dns_msg* msg, uint8_t* oldname, uint8_t* newname,
2458         size_t newlen, int an_only)
2459 {
2460         size_t i;
2461         size_t start = 0, end = msg->rep->rrset_count;
2462         if(!an_only) start = msg->rep->an_numrrsets;
2463         if(an_only) end = msg->rep->an_numrrsets;
2464         for(i=start; i<end; i++) {
2465                 /* allocated in region so we can change the ptrs */
2466                 if(query_dname_compare(msg->rep->rrsets[i]->rk.dname, oldname)
2467                         == 0) {
2468                         msg->rep->rrsets[i]->rk.dname = newname;
2469                         msg->rep->rrsets[i]->rk.dname_len = newlen;
2470                 }
2471         }
2472 }
2473
2474 /** find NSEC record covering the query */
2475 static struct auth_rrset*
2476 az_find_nsec_cover(struct auth_zone* z, struct auth_data** node)
2477 {
2478         uint8_t* nm = (*node)->name;
2479         size_t nmlen = (*node)->namelen;
2480         struct auth_rrset* rrset;
2481         /* find the NSEC for the smallest-or-equal node */
2482         /* if node == NULL, we did not find a smaller name.  But the zone
2483          * name is the smallest name and should have an NSEC. So there is
2484          * no NSEC to return (for a properly signed zone) */
2485         /* for empty nonterminals, the auth-data node should not exist,
2486          * and thus we don't need to go rbtree_previous here to find
2487          * a domain with an NSEC record */
2488         /* but there could be glue, and if this is node, then it has no NSEC.
2489          * Go up to find nonglue (previous) NSEC-holding nodes */
2490         while((rrset=az_domain_rrset(*node, LDNS_RR_TYPE_NSEC)) == NULL) {
2491                 if(dname_is_root(nm)) return NULL;
2492                 if(nmlen == z->namelen) return NULL;
2493                 dname_remove_label(&nm, &nmlen);
2494                 /* adjust *node for the nsec rrset to find in */
2495                 *node = az_find_name(z, nm, nmlen);
2496         }
2497         return rrset;
2498 }
2499
2500 /** Find NSEC and add for wildcard denial */
2501 static int
2502 az_nsec_wildcard_denial(struct auth_zone* z, struct regional* region,
2503         struct dns_msg* msg, uint8_t* cenm, size_t cenmlen)
2504 {
2505         struct query_info qinfo;
2506         int node_exact;
2507         struct auth_data* node;
2508         struct auth_rrset* nsec;
2509         uint8_t wc[LDNS_MAX_DOMAINLEN];
2510         if(cenmlen+2 > sizeof(wc))
2511                 return 0; /* result would be too long */
2512         wc[0] = 1; /* length of wildcard label */
2513         wc[1] = (uint8_t)'*'; /* wildcard label */
2514         memmove(wc+2, cenm, cenmlen);
2515
2516         /* we have '*.ce' in wc wildcard name buffer */
2517         /* get nsec cover for that */
2518         qinfo.qname = wc;
2519         qinfo.qname_len = cenmlen+2;
2520         qinfo.qtype = 0;
2521         qinfo.qclass = 0;
2522         az_find_domain(z, &qinfo, &node_exact, &node);
2523         if((nsec=az_find_nsec_cover(z, &node)) != NULL) {
2524                 if(!msg_add_rrset_ns(z, region, msg, node, nsec)) return 0;
2525         }
2526         return 1;
2527 }
2528
2529 /** Find the NSEC3PARAM rrset (if any) and if true you have the parameters */
2530 static int
2531 az_nsec3_param(struct auth_zone* z, int* algo, size_t* iter, uint8_t** salt,
2532         size_t* saltlen)
2533 {
2534         struct auth_data* apex;
2535         struct auth_rrset* param;
2536         size_t i;
2537         apex = az_find_name(z, z->name, z->namelen);
2538         if(!apex) return 0;
2539         param = az_domain_rrset(apex, LDNS_RR_TYPE_NSEC3PARAM);
2540         if(!param || param->data->count==0)
2541                 return 0; /* no RRset or no RRs in rrset */
2542         /* find out which NSEC3PARAM RR has supported parameters */
2543         /* skip unknown flags (dynamic signer is recalculating nsec3 chain) */
2544         for(i=0; i<param->data->count; i++) {
2545                 uint8_t* rdata = param->data->rr_data[i]+2;
2546                 size_t rdatalen = param->data->rr_len[i];
2547                 if(rdatalen < 2+5)
2548                         continue; /* too short */
2549                 if(!nsec3_hash_algo_size_supported((int)(rdata[0])))
2550                         continue; /* unsupported algo */
2551                 if(rdatalen < (size_t)(2+5+(size_t)rdata[4]))
2552                         continue; /* salt missing */
2553                 if((rdata[1]&NSEC3_UNKNOWN_FLAGS)!=0)
2554                         continue; /* unknown flags */
2555                 *algo = (int)(rdata[0]);
2556                 *iter = sldns_read_uint16(rdata+2);
2557                 *saltlen = rdata[4];
2558                 if(*saltlen == 0)
2559                         *salt = NULL;
2560                 else    *salt = rdata+5;
2561                 return 1;
2562         }
2563         /* no supported params */
2564         return 0;
2565 }
2566
2567 /** Hash a name with nsec3param into buffer, it has zone name appended.
2568  * return length of hash */
2569 static size_t
2570 az_nsec3_hash(uint8_t* buf, size_t buflen, uint8_t* nm, size_t nmlen,
2571         int algo, size_t iter, uint8_t* salt, size_t saltlen)
2572 {
2573         size_t hlen = nsec3_hash_algo_size_supported(algo);
2574         /* buffer has domain name, nsec3hash, and 256 is for max saltlen
2575          * (salt has 0-255 length) */
2576         unsigned char p[LDNS_MAX_DOMAINLEN+1+N3HASHBUFLEN+256];
2577         size_t i;
2578         if(nmlen+saltlen > sizeof(p) || hlen+saltlen > sizeof(p))
2579                 return 0;
2580         if(hlen > buflen)
2581                 return 0; /* somehow too large for destination buffer */
2582         /* hashfunc(name, salt) */
2583         memmove(p, nm, nmlen);
2584         query_dname_tolower(p);
2585         memmove(p+nmlen, salt, saltlen);
2586         (void)secalgo_nsec3_hash(algo, p, nmlen+saltlen, (unsigned char*)buf);
2587         for(i=0; i<iter; i++) {
2588                 /* hashfunc(hash, salt) */
2589                 memmove(p, buf, hlen);
2590                 memmove(p+hlen, salt, saltlen);
2591                 (void)secalgo_nsec3_hash(algo, p, hlen+saltlen,
2592                         (unsigned char*)buf);
2593         }
2594         return hlen;
2595 }
2596
2597 /** Hash name and return b32encoded hashname for lookup, zone name appended */
2598 static int
2599 az_nsec3_hashname(struct auth_zone* z, uint8_t* hashname, size_t* hashnmlen,
2600         uint8_t* nm, size_t nmlen, int algo, size_t iter, uint8_t* salt,
2601         size_t saltlen)
2602 {
2603         uint8_t hash[N3HASHBUFLEN];
2604         size_t hlen;
2605         int ret;
2606         hlen = az_nsec3_hash(hash, sizeof(hash), nm, nmlen, algo, iter,
2607                 salt, saltlen);
2608         if(!hlen) return 0;
2609         /* b32 encode */
2610         if(*hashnmlen < hlen*2+1+z->namelen) /* approx b32 as hexb16 */
2611                 return 0;
2612         ret = sldns_b32_ntop_extended_hex(hash, hlen, (char*)(hashname+1),
2613                 (*hashnmlen)-1);
2614         if(ret<1)
2615                 return 0;
2616         hashname[0] = (uint8_t)ret;
2617         ret++;
2618         if((*hashnmlen) - ret < z->namelen)
2619                 return 0;
2620         memmove(hashname+ret, z->name, z->namelen);
2621         *hashnmlen = z->namelen+(size_t)ret;
2622         return 1;
2623 }
2624
2625 /** Find the datanode that covers the nsec3hash-name */
2626 static struct auth_data*
2627 az_nsec3_findnode(struct auth_zone* z, uint8_t* hashnm, size_t hashnmlen)
2628 {
2629         struct query_info qinfo;
2630         struct auth_data* node;
2631         int node_exact;
2632         qinfo.qclass = 0;
2633         qinfo.qtype = 0;
2634         qinfo.qname = hashnm;
2635         qinfo.qname_len = hashnmlen;
2636         /* because canonical ordering and b32 nsec3 ordering are the same.
2637          * this is a good lookup to find the nsec3 name. */
2638         az_find_domain(z, &qinfo, &node_exact, &node);
2639         /* but we may have to skip non-nsec3 nodes */
2640         /* this may be a lot, the way to speed that up is to have a
2641          * separate nsec3 tree with nsec3 nodes */
2642         while(node && (rbnode_type*)node != RBTREE_NULL &&
2643                 !az_domain_rrset(node, LDNS_RR_TYPE_NSEC3)) {
2644                 node = (struct auth_data*)rbtree_previous(&node->node);
2645         }
2646         if((rbnode_type*)node == RBTREE_NULL)
2647                 node = NULL;
2648         return node;
2649 }
2650
2651 /** Find cover for hashed(nm, nmlen) (or NULL) */
2652 static struct auth_data*
2653 az_nsec3_find_cover(struct auth_zone* z, uint8_t* nm, size_t nmlen,
2654         int algo, size_t iter, uint8_t* salt, size_t saltlen)
2655 {
2656         struct auth_data* node;
2657         uint8_t hname[LDNS_MAX_DOMAINLEN];
2658         size_t hlen = sizeof(hname);
2659         if(!az_nsec3_hashname(z, hname, &hlen, nm, nmlen, algo, iter,
2660                 salt, saltlen))
2661                 return NULL;
2662         node = az_nsec3_findnode(z, hname, hlen);
2663         if(node)
2664                 return node;
2665         /* we did not find any, perhaps because the NSEC3 hash is before
2666          * the first hash, we have to find the 'last hash' in the zone */
2667         node = (struct auth_data*)rbtree_last(&z->data);
2668         while(node && (rbnode_type*)node != RBTREE_NULL &&
2669                 !az_domain_rrset(node, LDNS_RR_TYPE_NSEC3)) {
2670                 node = (struct auth_data*)rbtree_previous(&node->node);
2671         }
2672         if((rbnode_type*)node == RBTREE_NULL)
2673                 node = NULL;
2674         return node;
2675 }
2676
2677 /** Find exact match for hashed(nm, nmlen) NSEC3 record or NULL */
2678 static struct auth_data*
2679 az_nsec3_find_exact(struct auth_zone* z, uint8_t* nm, size_t nmlen,
2680         int algo, size_t iter, uint8_t* salt, size_t saltlen)
2681 {
2682         struct auth_data* node;
2683         uint8_t hname[LDNS_MAX_DOMAINLEN];
2684         size_t hlen = sizeof(hname);
2685         if(!az_nsec3_hashname(z, hname, &hlen, nm, nmlen, algo, iter,
2686                 salt, saltlen))
2687                 return NULL;
2688         node = az_find_name(z, hname, hlen);
2689         if(az_domain_rrset(node, LDNS_RR_TYPE_NSEC3))
2690                 return node;
2691         return NULL;
2692 }
2693
2694 /** Return nextcloser name (as a ref into the qname).  This is one label
2695  * more than the cenm (cename must be a suffix of qname) */
2696 static void
2697 az_nsec3_get_nextcloser(uint8_t* cenm, uint8_t* qname, size_t qname_len,
2698         uint8_t** nx, size_t* nxlen)
2699 {
2700         int celabs = dname_count_labels(cenm);
2701         int qlabs = dname_count_labels(qname);
2702         int strip = qlabs - celabs -1;
2703         log_assert(dname_strict_subdomain(qname, qlabs, cenm, celabs));
2704         *nx = qname;
2705         *nxlen = qname_len;
2706         if(strip>0)
2707                 dname_remove_labels(nx, nxlen, strip);
2708 }
2709
2710 /** Find the closest encloser that has exact NSEC3.
2711  * updated cenm to the new name. If it went up no-exact-ce is true. */
2712 static struct auth_data*
2713 az_nsec3_find_ce(struct auth_zone* z, uint8_t** cenm, size_t* cenmlen,
2714         int* no_exact_ce, int algo, size_t iter, uint8_t* salt, size_t saltlen)
2715 {
2716         struct auth_data* node;
2717         while((node = az_nsec3_find_exact(z, *cenm, *cenmlen,
2718                 algo, iter, salt, saltlen)) == NULL) {
2719                 if(*cenmlen == z->namelen) {
2720                         /* next step up would take us out of the zone. fail */
2721                         return NULL;
2722                 }
2723                 *no_exact_ce = 1;
2724                 dname_remove_label(cenm, cenmlen);
2725         }
2726         return node;
2727 }
2728
2729 /* Insert NSEC3 record in authority section, if NULL does nothing */
2730 static int
2731 az_nsec3_insert(struct auth_zone* z, struct regional* region,
2732         struct dns_msg* msg, struct auth_data* node)
2733 {
2734         struct auth_rrset* nsec3;
2735         if(!node) return 1; /* no node, skip this */
2736         nsec3 = az_domain_rrset(node, LDNS_RR_TYPE_NSEC3);
2737         if(!nsec3) return 1; /* if no nsec3 RR, skip it */
2738         if(!msg_add_rrset_ns(z, region, msg, node, nsec3)) return 0;
2739         return 1;
2740 }
2741
2742 /** add NSEC3 records to the zone for the nsec3 proof.
2743  * Specify with the flags with parts of the proof are required.
2744  * the ce is the exact matching name (for notype) but also delegation points.
2745  * qname is the one where the nextcloser name can be derived from.
2746  * If NSEC3 is not properly there (in the zone) nothing is added.
2747  * always enabled: include nsec3 proving about the Closest Encloser.
2748  *      that is an exact match that should exist for it.
2749  *      If that does not exist, a higher exact match + nxproof is enabled
2750  *      (for some sort of opt-out empty nonterminal cases).
2751  * nodataproof: search for exact match and include that instead.
2752  * ceproof: include ce proof NSEC3 (omitted for wildcard replies).
2753  * nxproof: include denial of the qname.
2754  * wcproof: include denial of wildcard (wildcard.ce).
2755  */
2756 static int
2757 az_add_nsec3_proof(struct auth_zone* z, struct regional* region,
2758         struct dns_msg* msg, uint8_t* cenm, size_t cenmlen, uint8_t* qname,
2759         size_t qname_len, int nodataproof, int ceproof, int nxproof,
2760         int wcproof)
2761 {
2762         int algo;
2763         size_t iter, saltlen;
2764         uint8_t* salt;
2765         int no_exact_ce = 0;
2766         struct auth_data* node;
2767
2768         /* find parameters of nsec3 proof */
2769         if(!az_nsec3_param(z, &algo, &iter, &salt, &saltlen))
2770                 return 1; /* no nsec3 */
2771         if(nodataproof) {
2772                 /* see if the node has a hash of itself for the nodata
2773                  * proof nsec3, this has to be an exact match nsec3. */
2774                 struct auth_data* match;
2775                 match = az_nsec3_find_exact(z, qname, qname_len, algo,
2776                         iter, salt, saltlen);
2777                 if(match) {
2778                         if(!az_nsec3_insert(z, region, msg, match))
2779                                 return 0;
2780                         /* only nodata NSEC3 needed, no CE or others. */
2781                         return 1;
2782                 }
2783         }
2784         /* find ce that has an NSEC3 */
2785         if(ceproof) {
2786                 node = az_nsec3_find_ce(z, &cenm, &cenmlen, &no_exact_ce,
2787                         algo, iter, salt, saltlen);
2788                 if(no_exact_ce) nxproof = 1;
2789                 if(!az_nsec3_insert(z, region, msg, node))
2790                         return 0;
2791         }
2792
2793         if(nxproof) {
2794                 uint8_t* nx;
2795                 size_t nxlen;
2796                 /* create nextcloser domain name */
2797                 az_nsec3_get_nextcloser(cenm, qname, qname_len, &nx, &nxlen);
2798                 /* find nsec3 that matches or covers it */
2799                 node = az_nsec3_find_cover(z, nx, nxlen, algo, iter, salt,
2800                         saltlen);
2801                 if(!az_nsec3_insert(z, region, msg, node))
2802                         return 0;
2803         }
2804         if(wcproof) {
2805                 /* create wildcard name *.ce */
2806                 uint8_t wc[LDNS_MAX_DOMAINLEN];
2807                 size_t wclen;
2808                 if(cenmlen+2 > sizeof(wc))
2809                         return 0; /* result would be too long */
2810                 wc[0] = 1; /* length of wildcard label */
2811                 wc[1] = (uint8_t)'*'; /* wildcard label */
2812                 memmove(wc+2, cenm, cenmlen);
2813                 wclen = cenmlen+2;
2814                 /* find nsec3 that matches or covers it */
2815                 node = az_nsec3_find_cover(z, wc, wclen, algo, iter, salt,
2816                         saltlen);
2817                 if(!az_nsec3_insert(z, region, msg, node))
2818                         return 0;
2819         }
2820         return 1;
2821 }
2822
2823 /** generate answer for positive answer */
2824 static int
2825 az_generate_positive_answer(struct auth_zone* z, struct regional* region,
2826         struct dns_msg* msg, struct auth_data* node, struct auth_rrset* rrset)
2827 {
2828         if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
2829         /* see if we want additional rrs */
2830         if(rrset->type == LDNS_RR_TYPE_MX) {
2831                 if(!az_add_additionals_from(z, region, msg, rrset, 2))
2832                         return 0;
2833         } else if(rrset->type == LDNS_RR_TYPE_SRV) {
2834                 if(!az_add_additionals_from(z, region, msg, rrset, 6))
2835                         return 0;
2836         } else if(rrset->type == LDNS_RR_TYPE_NS) {
2837                 if(!az_add_additionals_from(z, region, msg, rrset, 0))
2838                         return 0;
2839         }
2840         return 1;
2841 }
2842
2843 /** generate answer for type ANY answer */
2844 static int
2845 az_generate_any_answer(struct auth_zone* z, struct regional* region,
2846         struct dns_msg* msg, struct auth_data* node)
2847 {
2848         struct auth_rrset* rrset;
2849         int added = 0;
2850         /* add a couple (at least one) RRs */
2851         if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_SOA)) != NULL) {
2852                 if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
2853                 added++;
2854         }
2855         if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_MX)) != NULL) {
2856                 if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
2857                 added++;
2858         }
2859         if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_A)) != NULL) {
2860                 if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
2861                 added++;
2862         }
2863         if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_AAAA)) != NULL) {
2864                 if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
2865                 added++;
2866         }
2867         if(added == 0 && node && node->rrsets) {
2868                 if(!msg_add_rrset_an(z, region, msg, node,
2869                         node->rrsets)) return 0;
2870         }
2871         return 1;
2872 }
2873
2874 /** follow cname chain and add more data to the answer section */
2875 static int
2876 follow_cname_chain(struct auth_zone* z, uint16_t qtype,
2877         struct regional* region, struct dns_msg* msg,
2878         struct packed_rrset_data* d)
2879 {
2880         int maxchain = 0;
2881         /* see if we can add the target of the CNAME into the answer */
2882         while(maxchain++ < MAX_CNAME_CHAIN) {
2883                 struct auth_data* node;
2884                 struct auth_rrset* rrset;
2885                 size_t clen;
2886                 /* d has cname rdata */
2887                 if(d->count == 0) break; /* no CNAME */
2888                 if(d->rr_len[0] < 2+1) break; /* too small */
2889                 if((clen=dname_valid(d->rr_data[0]+2, d->rr_len[0]-2))==0)
2890                         break; /* malformed */
2891                 if(!dname_subdomain_c(d->rr_data[0]+2, z->name))
2892                         break; /* target out of zone */
2893                 if((node = az_find_name(z, d->rr_data[0]+2, clen))==NULL)
2894                         break; /* no such target name */
2895                 if((rrset=az_domain_rrset(node, qtype))!=NULL) {
2896                         /* done we found the target */
2897                         if(!msg_add_rrset_an(z, region, msg, node, rrset))
2898                                 return 0;
2899                         break;
2900                 }
2901                 if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_CNAME))==NULL)
2902                         break; /* no further CNAME chain, notype */
2903                 if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
2904                 d = rrset->data;
2905         }
2906         return 1;
2907 }
2908
2909 /** generate answer for cname answer */
2910 static int
2911 az_generate_cname_answer(struct auth_zone* z, struct query_info* qinfo,
2912         struct regional* region, struct dns_msg* msg,
2913         struct auth_data* node, struct auth_rrset* rrset)
2914 {
2915         if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
2916         if(!rrset) return 1;
2917         if(!follow_cname_chain(z, qinfo->qtype, region, msg, rrset->data))
2918                 return 0;
2919         return 1;
2920 }
2921
2922 /** generate answer for notype answer */
2923 static int
2924 az_generate_notype_answer(struct auth_zone* z, struct regional* region,
2925         struct dns_msg* msg, struct auth_data* node)
2926 {
2927         struct auth_rrset* rrset;
2928         if(!az_add_negative_soa(z, region, msg)) return 0;
2929         /* DNSSEC denial NSEC */
2930         if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_NSEC))!=NULL) {
2931                 if(!msg_add_rrset_ns(z, region, msg, node, rrset)) return 0;
2932         } else if(node) {
2933                 /* DNSSEC denial NSEC3 */
2934                 if(!az_add_nsec3_proof(z, region, msg, node->name,
2935                         node->namelen, msg->qinfo.qname,
2936                         msg->qinfo.qname_len, 1, 1, 0, 0))
2937                         return 0;
2938         }
2939         return 1;
2940 }
2941
2942 /** generate answer for referral answer */
2943 static int
2944 az_generate_referral_answer(struct auth_zone* z, struct regional* region,
2945         struct dns_msg* msg, struct auth_data* ce, struct auth_rrset* rrset)
2946 {
2947         struct auth_rrset* ds, *nsec;
2948         /* turn off AA flag, referral is nonAA because it leaves the zone */
2949         log_assert(ce);
2950         msg->rep->flags &= ~BIT_AA;
2951         if(!msg_add_rrset_ns(z, region, msg, ce, rrset)) return 0;
2952         /* add DS or deny it */
2953         if((ds=az_domain_rrset(ce, LDNS_RR_TYPE_DS))!=NULL) {
2954                 if(!msg_add_rrset_ns(z, region, msg, ce, ds)) return 0;
2955         } else {
2956                 /* deny the DS */
2957                 if((nsec=az_domain_rrset(ce, LDNS_RR_TYPE_NSEC))!=NULL) {
2958                         if(!msg_add_rrset_ns(z, region, msg, ce, nsec))
2959                                 return 0;
2960                 } else {
2961                         if(!az_add_nsec3_proof(z, region, msg, ce->name,
2962                                 ce->namelen, msg->qinfo.qname,
2963                                 msg->qinfo.qname_len, 1, 1, 0, 0))
2964                                 return 0;
2965                 }
2966         }
2967         /* add additional rrs for type NS */
2968         if(!az_add_additionals_from(z, region, msg, rrset, 0)) return 0;
2969         return 1;
2970 }
2971
2972 /** generate answer for DNAME answer */
2973 static int
2974 az_generate_dname_answer(struct auth_zone* z, struct query_info* qinfo,
2975         struct regional* region, struct dns_msg* msg, struct auth_data* ce,
2976         struct auth_rrset* rrset)
2977 {
2978         log_assert(ce);
2979         /* add the DNAME and then a CNAME */
2980         if(!msg_add_rrset_an(z, region, msg, ce, rrset)) return 0;
2981         if(!add_synth_cname(z, qinfo->qname, qinfo->qname_len, region,
2982                 msg, ce, rrset)) return 0;
2983         if(FLAGS_GET_RCODE(msg->rep->flags) == LDNS_RCODE_YXDOMAIN)
2984                 return 1;
2985         if(msg->rep->rrset_count == 0 ||
2986                 !msg->rep->rrsets[msg->rep->rrset_count-1])
2987                 return 0;
2988         if(!follow_cname_chain(z, qinfo->qtype, region, msg,
2989                 (struct packed_rrset_data*)msg->rep->rrsets[
2990                 msg->rep->rrset_count-1]->entry.data))
2991                 return 0;
2992         return 1;
2993 }
2994
2995 /** generate answer for wildcard answer */
2996 static int
2997 az_generate_wildcard_answer(struct auth_zone* z, struct query_info* qinfo,
2998         struct regional* region, struct dns_msg* msg, struct auth_data* ce,
2999         struct auth_data* wildcard, struct auth_data* node)
3000 {
3001         struct auth_rrset* rrset, *nsec;
3002         int insert_ce = 0;
3003         if((rrset=az_domain_rrset(wildcard, qinfo->qtype)) != NULL) {
3004                 /* wildcard has type, add it */
3005                 if(!msg_add_rrset_an(z, region, msg, wildcard, rrset))
3006                         return 0;
3007                 az_change_dnames(msg, wildcard->name, msg->qinfo.qname,
3008                         msg->qinfo.qname_len, 1);
3009         } else if((rrset=az_domain_rrset(wildcard, LDNS_RR_TYPE_CNAME))!=NULL) {
3010                 /* wildcard has cname instead, do that */
3011                 if(!msg_add_rrset_an(z, region, msg, wildcard, rrset))
3012                         return 0;
3013                 az_change_dnames(msg, wildcard->name, msg->qinfo.qname,
3014                         msg->qinfo.qname_len, 1);
3015                 if(!follow_cname_chain(z, qinfo->qtype, region, msg,
3016                         rrset->data))
3017                         return 0;
3018         } else if(qinfo->qtype == LDNS_RR_TYPE_ANY && wildcard->rrsets) {
3019                 /* add ANY rrsets from wildcard node */
3020                 if(!az_generate_any_answer(z, region, msg, wildcard))
3021                         return 0;
3022                 az_change_dnames(msg, wildcard->name, msg->qinfo.qname,
3023                         msg->qinfo.qname_len, 1);
3024         } else {
3025                 /* wildcard has nodata, notype answer */
3026                 /* call other notype routine for dnssec notype denials */
3027                 if(!az_generate_notype_answer(z, region, msg, wildcard))
3028                         return 0;
3029                 /* because the notype, there is no positive data with an
3030                  * RRSIG that indicates the wildcard position.  Thus the
3031                  * wildcard qname denial needs to have a CE nsec3. */
3032                 insert_ce = 1;
3033         }
3034
3035         /* ce and node for dnssec denial of wildcard original name */
3036         if((nsec=az_find_nsec_cover(z, &node)) != NULL) {
3037                 if(!msg_add_rrset_ns(z, region, msg, node, nsec)) return 0;
3038         } else if(ce) {
3039                 uint8_t* wildup = wildcard->name;
3040                 size_t wilduplen= wildcard->namelen;
3041                 dname_remove_label(&wildup, &wilduplen);
3042                 if(!az_add_nsec3_proof(z, region, msg, wildup,
3043                         wilduplen, msg->qinfo.qname,
3044                         msg->qinfo.qname_len, 0, insert_ce, 1, 0))
3045                         return 0;
3046         }
3047
3048         /* fixup name of wildcard from *.zone to qname, use already allocated
3049          * pointer to msg qname */
3050         az_change_dnames(msg, wildcard->name, msg->qinfo.qname,
3051                 msg->qinfo.qname_len, 0);
3052         return 1;
3053 }
3054
3055 /** generate answer for nxdomain answer */
3056 static int
3057 az_generate_nxdomain_answer(struct auth_zone* z, struct regional* region,
3058         struct dns_msg* msg, struct auth_data* ce, struct auth_data* node)
3059 {
3060         struct auth_rrset* nsec;
3061         msg->rep->flags |= LDNS_RCODE_NXDOMAIN;
3062         if(!az_add_negative_soa(z, region, msg)) return 0;
3063         if((nsec=az_find_nsec_cover(z, &node)) != NULL) {
3064                 if(!msg_add_rrset_ns(z, region, msg, node, nsec)) return 0;
3065                 if(ce && !az_nsec_wildcard_denial(z, region, msg, ce->name,
3066                         ce->namelen)) return 0;
3067         } else if(ce) {
3068                 if(!az_add_nsec3_proof(z, region, msg, ce->name,
3069                         ce->namelen, msg->qinfo.qname,
3070                         msg->qinfo.qname_len, 0, 1, 1, 1))
3071                         return 0;
3072         }
3073         return 1;
3074 }
3075
3076 /** Create answers when an exact match exists for the domain name */
3077 static int
3078 az_generate_answer_with_node(struct auth_zone* z, struct query_info* qinfo,
3079         struct regional* region, struct dns_msg* msg, struct auth_data* node)
3080 {
3081         struct auth_rrset* rrset;
3082         /* positive answer, rrset we are looking for exists */
3083         if((rrset=az_domain_rrset(node, qinfo->qtype)) != NULL) {
3084                 return az_generate_positive_answer(z, region, msg, node, rrset);
3085         }
3086         /* CNAME? */
3087         if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_CNAME)) != NULL) {
3088                 return az_generate_cname_answer(z, qinfo, region, msg,
3089                         node, rrset);
3090         }
3091         /* type ANY ? */
3092         if(qinfo->qtype == LDNS_RR_TYPE_ANY) {
3093                 return az_generate_any_answer(z, region, msg, node);
3094         }
3095         /* NOERROR/NODATA (no such type at domain name) */
3096         return az_generate_notype_answer(z, region, msg, node);
3097 }
3098
3099 /** Generate answer without an existing-node that we can use.
3100  * So it'll be a referral, DNAME or nxdomain */
3101 static int
3102 az_generate_answer_nonexistnode(struct auth_zone* z, struct query_info* qinfo,
3103         struct regional* region, struct dns_msg* msg, struct auth_data* ce,
3104         struct auth_rrset* rrset, struct auth_data* node)
3105 {
3106         struct auth_data* wildcard;
3107
3108         /* we do not have an exact matching name (that exists) */
3109         /* see if we have a NS or DNAME in the ce */
3110         if(ce && rrset && rrset->type == LDNS_RR_TYPE_NS) {
3111                 return az_generate_referral_answer(z, region, msg, ce, rrset);
3112         }
3113         if(ce && rrset && rrset->type == LDNS_RR_TYPE_DNAME) {
3114                 return az_generate_dname_answer(z, qinfo, region, msg, ce,
3115                         rrset);
3116         }
3117         /* if there is an empty nonterminal, wildcard and nxdomain don't
3118          * happen, it is a notype answer */
3119         if(az_empty_nonterminal(z, qinfo, node)) {
3120                 return az_generate_notype_answer(z, region, msg, node);
3121         }
3122         /* see if we have a wildcard under the ce */
3123         if((wildcard=az_find_wildcard(z, qinfo, ce)) != NULL) {
3124                 return az_generate_wildcard_answer(z, qinfo, region, msg,
3125                         ce, wildcard, node);
3126         }
3127         /* generate nxdomain answer */
3128         return az_generate_nxdomain_answer(z, region, msg, ce, node);
3129 }
3130
3131 /** Lookup answer in a zone. */
3132 static int
3133 auth_zone_generate_answer(struct auth_zone* z, struct query_info* qinfo,
3134         struct regional* region, struct dns_msg** msg, int* fallback)
3135 {
3136         struct auth_data* node, *ce;
3137         struct auth_rrset* rrset;
3138         int node_exact, node_exists;
3139         /* does the zone want fallback in case of failure? */
3140         *fallback = z->fallback_enabled;
3141         if(!(*msg=msg_create(region, qinfo))) return 0;
3142
3143         /* lookup if there is a matching domain name for the query */
3144         az_find_domain(z, qinfo, &node_exact, &node);
3145
3146         /* see if node exists for generating answers from (i.e. not glue and
3147          * obscured by NS or DNAME or NSEC3-only), and also return the
3148          * closest-encloser from that, closest node that should be used
3149          * to generate answers from that is above the query */
3150         node_exists = az_find_ce(z, qinfo, node, node_exact, &ce, &rrset);
3151
3152         if(verbosity >= VERB_ALGO) {
3153                 char zname[256], qname[256], nname[256], cename[256],
3154                         tpstr[32], rrstr[32];
3155                 sldns_wire2str_dname_buf(qinfo->qname, qinfo->qname_len, qname,
3156                         sizeof(qname));
3157                 sldns_wire2str_type_buf(qinfo->qtype, tpstr, sizeof(tpstr));
3158                 sldns_wire2str_dname_buf(z->name, z->namelen, zname,
3159                         sizeof(zname));
3160                 if(node)
3161                         sldns_wire2str_dname_buf(node->name, node->namelen,
3162                                 nname, sizeof(nname));
3163                 else    snprintf(nname, sizeof(nname), "NULL");
3164                 if(ce)
3165                         sldns_wire2str_dname_buf(ce->name, ce->namelen,
3166                                 cename, sizeof(cename));
3167                 else    snprintf(cename, sizeof(cename), "NULL");
3168                 if(rrset) sldns_wire2str_type_buf(rrset->type, rrstr,
3169                         sizeof(rrstr));
3170                 else    snprintf(rrstr, sizeof(rrstr), "NULL");
3171                 log_info("auth_zone %s query %s %s, domain %s %s %s, "
3172                         "ce %s, rrset %s", zname, qname, tpstr, nname,
3173                         (node_exact?"exact":"notexact"),
3174                         (node_exists?"exist":"notexist"), cename, rrstr);
3175         }
3176
3177         if(node_exists) {
3178                 /* the node is fine, generate answer from node */
3179                 return az_generate_answer_with_node(z, qinfo, region, *msg,
3180                         node);
3181         }
3182         return az_generate_answer_nonexistnode(z, qinfo, region, *msg,
3183                 ce, rrset, node);
3184 }
3185
3186 int auth_zones_lookup(struct auth_zones* az, struct query_info* qinfo,
3187         struct regional* region, struct dns_msg** msg, int* fallback,
3188         uint8_t* dp_nm, size_t dp_nmlen)
3189 {
3190         int r;
3191         struct auth_zone* z;
3192         /* find the zone that should contain the answer. */
3193         lock_rw_rdlock(&az->lock);
3194         z = auth_zone_find(az, dp_nm, dp_nmlen, qinfo->qclass);
3195         if(!z) {
3196                 lock_rw_unlock(&az->lock);
3197                 /* no auth zone, fallback to internet */
3198                 *fallback = 1;
3199                 return 0;
3200         }
3201         lock_rw_rdlock(&z->lock);
3202         lock_rw_unlock(&az->lock);
3203
3204         /* if not for upstream queries, fallback */
3205         if(!z->for_upstream) {
3206                 lock_rw_unlock(&z->lock);
3207                 *fallback = 1;
3208                 return 0;
3209         }
3210         if(z->zone_expired) {
3211                 *fallback = z->fallback_enabled;
3212                 lock_rw_unlock(&z->lock);
3213                 return 0;
3214         }
3215         /* see what answer that zone would generate */
3216         r = auth_zone_generate_answer(z, qinfo, region, msg, fallback);
3217         lock_rw_unlock(&z->lock);
3218         return r;
3219 }
3220
3221 /** encode auth answer */
3222 static void
3223 auth_answer_encode(struct query_info* qinfo, struct module_env* env,
3224         struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* buf,
3225         struct regional* temp, struct dns_msg* msg)
3226 {
3227         uint16_t udpsize;
3228         udpsize = edns->udp_size;
3229         edns->edns_version = EDNS_ADVERTISED_VERSION;
3230         edns->udp_size = EDNS_ADVERTISED_SIZE;
3231         edns->ext_rcode = 0;
3232         edns->bits &= EDNS_DO;
3233
3234         if(!inplace_cb_reply_local_call(env, qinfo, NULL, msg->rep,
3235                 (int)FLAGS_GET_RCODE(msg->rep->flags), edns, repinfo, temp)
3236                 || !reply_info_answer_encode(qinfo, msg->rep,
3237                 *(uint16_t*)sldns_buffer_begin(buf),
3238                 sldns_buffer_read_u16_at(buf, 2),
3239                 buf, 0, 0, temp, udpsize, edns,
3240                 (int)(edns->bits&EDNS_DO), 0)) {
3241                 error_encode(buf, (LDNS_RCODE_SERVFAIL|BIT_AA), qinfo,
3242                         *(uint16_t*)sldns_buffer_begin(buf),
3243                         sldns_buffer_read_u16_at(buf, 2), edns);
3244         }
3245 }
3246
3247 /** encode auth error answer */
3248 static void
3249 auth_error_encode(struct query_info* qinfo, struct module_env* env,
3250         struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* buf,
3251         struct regional* temp, int rcode)
3252 {
3253         edns->edns_version = EDNS_ADVERTISED_VERSION;
3254         edns->udp_size = EDNS_ADVERTISED_SIZE;
3255         edns->ext_rcode = 0;
3256         edns->bits &= EDNS_DO;
3257
3258         if(!inplace_cb_reply_local_call(env, qinfo, NULL, NULL,
3259                 rcode, edns, repinfo, temp))
3260                 edns->opt_list = NULL;
3261         error_encode(buf, rcode|BIT_AA, qinfo,
3262                 *(uint16_t*)sldns_buffer_begin(buf),
3263                 sldns_buffer_read_u16_at(buf, 2), edns);
3264 }
3265
3266 int auth_zones_answer(struct auth_zones* az, struct module_env* env,
3267         struct query_info* qinfo, struct edns_data* edns,
3268         struct comm_reply* repinfo, struct sldns_buffer* buf, struct regional* temp)
3269 {
3270         struct dns_msg* msg = NULL;
3271         struct auth_zone* z;
3272         int r;
3273         int fallback = 0;
3274
3275         lock_rw_rdlock(&az->lock);
3276         if(!az->have_downstream) {
3277                 /* no downstream auth zones */
3278                 lock_rw_unlock(&az->lock);
3279                 return 0;
3280         }
3281         if(qinfo->qtype == LDNS_RR_TYPE_DS) {
3282                 uint8_t* delname = qinfo->qname;
3283                 size_t delnamelen = qinfo->qname_len;
3284                 dname_remove_label(&delname, &delnamelen);
3285                 z = auth_zones_find_zone(az, delname, delnamelen,
3286                         qinfo->qclass);
3287         } else {
3288                 z = auth_zones_find_zone(az, qinfo->qname, qinfo->qname_len,
3289                         qinfo->qclass);
3290         }
3291         if(!z) {
3292                 /* no zone above it */
3293                 lock_rw_unlock(&az->lock);
3294                 return 0;
3295         }
3296         lock_rw_rdlock(&z->lock);
3297         lock_rw_unlock(&az->lock);
3298         if(!z->for_downstream) {
3299                 lock_rw_unlock(&z->lock);
3300                 return 0;
3301         }
3302         if(z->zone_expired) {
3303                 if(z->fallback_enabled) {
3304                         lock_rw_unlock(&z->lock);
3305                         return 0;
3306                 }
3307                 lock_rw_unlock(&z->lock);
3308                 lock_rw_wrlock(&az->lock);
3309                 az->num_query_down++;
3310                 lock_rw_unlock(&az->lock);
3311                 auth_error_encode(qinfo, env, edns, repinfo, buf, temp,
3312                         LDNS_RCODE_SERVFAIL);
3313                 return 1;
3314         }
3315
3316         /* answer it from zone z */
3317         r = auth_zone_generate_answer(z, qinfo, temp, &msg, &fallback);
3318         lock_rw_unlock(&z->lock);
3319         if(!r && fallback) {
3320                 /* fallback to regular answering (recursive) */
3321                 return 0;
3322         }
3323         lock_rw_wrlock(&az->lock);
3324         az->num_query_down++;
3325         lock_rw_unlock(&az->lock);
3326
3327         /* encode answer */
3328         if(!r)
3329                 auth_error_encode(qinfo, env, edns, repinfo, buf, temp,
3330                         LDNS_RCODE_SERVFAIL);
3331         else    auth_answer_encode(qinfo, env, edns, repinfo, buf, temp, msg);
3332
3333         return 1;
3334 }
3335
3336 int auth_zones_can_fallback(struct auth_zones* az, uint8_t* nm, size_t nmlen,
3337         uint16_t dclass)
3338 {
3339         int r;
3340         struct auth_zone* z;
3341         lock_rw_rdlock(&az->lock);
3342         z = auth_zone_find(az, nm, nmlen, dclass);
3343         if(!z) {
3344                 lock_rw_unlock(&az->lock);
3345                 /* no such auth zone, fallback */
3346                 return 1;
3347         }
3348         lock_rw_rdlock(&z->lock);
3349         lock_rw_unlock(&az->lock);
3350         r = z->fallback_enabled || (!z->for_upstream);
3351         lock_rw_unlock(&z->lock);
3352         return r;
3353 }
3354
3355 int
3356 auth_zone_parse_notify_serial(sldns_buffer* pkt, uint32_t *serial)
3357 {
3358         struct query_info q;
3359         uint16_t rdlen;
3360         memset(&q, 0, sizeof(q));
3361         sldns_buffer_set_position(pkt, 0);
3362         if(!query_info_parse(&q, pkt)) return 0;
3363         if(LDNS_ANCOUNT(sldns_buffer_begin(pkt)) == 0) return 0;
3364         /* skip name of RR in answer section */
3365         if(sldns_buffer_remaining(pkt) < 1) return 0;
3366         if(pkt_dname_len(pkt) == 0) return 0;
3367         /* check type */
3368         if(sldns_buffer_remaining(pkt) < 10 /* type,class,ttl,rdatalen*/)
3369                 return 0;
3370         if(sldns_buffer_read_u16(pkt) != LDNS_RR_TYPE_SOA) return 0;
3371         sldns_buffer_skip(pkt, 2); /* class */
3372         sldns_buffer_skip(pkt, 4); /* ttl */
3373         rdlen = sldns_buffer_read_u16(pkt); /* rdatalen */
3374         if(sldns_buffer_remaining(pkt) < rdlen) return 0;
3375         if(rdlen < 22) return 0; /* bad soa length */
3376         sldns_buffer_skip(pkt, (ssize_t)(rdlen-20));
3377         *serial = sldns_buffer_read_u32(pkt);
3378         /* return true when has serial in answer section */
3379         return 1;
3380 }
3381
3382 /** see if addr appears in the list */
3383 static int
3384 addr_in_list(struct auth_addr* list, struct sockaddr_storage* addr,
3385         socklen_t addrlen)
3386 {
3387         struct auth_addr* p;
3388         for(p=list; p; p=p->next) {
3389                 if(sockaddr_cmp_addr(addr, addrlen, &p->addr, p->addrlen)==0)
3390                         return 1;
3391         }
3392         return 0;
3393 }
3394
3395 /** check if an address matches a master specification (or one of its
3396  * addresses in the addr list) */
3397 static int
3398 addr_matches_master(struct auth_master* master, struct sockaddr_storage* addr,
3399         socklen_t addrlen, struct auth_master** fromhost)
3400 {
3401         struct sockaddr_storage a;
3402         socklen_t alen = 0;
3403         int net = 0;
3404         if(addr_in_list(master->list, addr, addrlen)) {
3405                 *fromhost = master;
3406                 return 1;
3407         }
3408         /* compare address (but not port number, that is the destination
3409          * port of the master, the port number of the received notify is
3410          * allowed to by any port on that master) */
3411         if(extstrtoaddr(master->host, &a, &alen) &&
3412                 sockaddr_cmp_addr(addr, addrlen, &a, alen)==0) {
3413                 *fromhost = master;
3414                 return 1;
3415         }
3416         /* prefixes, addr/len, like 10.0.0.0/8 */
3417         /* not http and has a / and there is one / */
3418         if(master->allow_notify && !master->http &&
3419                 strchr(master->host, '/') != NULL &&
3420                 strchr(master->host, '/') == strrchr(master->host, '/') &&
3421                 netblockstrtoaddr(master->host, UNBOUND_DNS_PORT, &a, &alen,
3422                 &net) && alen == addrlen) {
3423                 if(addr_in_common(addr, (addr_is_ip6(addr, addrlen)?128:32),
3424                         &a, net, alen) >= net) {
3425                         *fromhost = NULL; /* prefix does not have destination
3426                                 to send the probe or transfer with */
3427                         return 1; /* matches the netblock */
3428                 }
3429         }
3430         return 0;
3431 }
3432
3433 /** check access list for notifies */
3434 static int
3435 az_xfr_allowed_notify(struct auth_xfer* xfr, struct sockaddr_storage* addr,
3436         socklen_t addrlen, struct auth_master** fromhost)
3437 {
3438         struct auth_master* p;
3439         for(p=xfr->allow_notify_list; p; p=p->next) {
3440                 if(addr_matches_master(p, addr, addrlen, fromhost)) {
3441                         return 1;
3442                 }
3443         }
3444         return 0;
3445 }
3446
3447 /** see if the serial means the zone has to be updated, i.e. the serial
3448  * is newer than the zone serial, or we have no zone */
3449 static int
3450 xfr_serial_means_update(struct auth_xfer* xfr, uint32_t serial)
3451 {
3452         if(!xfr->have_zone)
3453                 return 1; /* no zone, anything is better */
3454         if(xfr->zone_expired)
3455                 return 1; /* expired, the sent serial is better than expired
3456                         data */
3457         if(compare_serial(xfr->serial, serial) < 0)
3458                 return 1; /* our serial is smaller than the sent serial,
3459                         the data is newer, fetch it */
3460         return 0;
3461 }
3462
3463 /** note notify serial, updates the notify information in the xfr struct */
3464 static void
3465 xfr_note_notify_serial(struct auth_xfer* xfr, int has_serial, uint32_t serial)
3466 {
3467         if(xfr->notify_received && xfr->notify_has_serial && has_serial) {
3468                 /* see if this serial is newer */
3469                 if(compare_serial(xfr->notify_serial, serial) < 0)
3470                         xfr->notify_serial = serial;
3471         } else if(xfr->notify_received && xfr->notify_has_serial &&
3472                 !has_serial) {
3473                 /* remove serial, we have notify without serial */
3474                 xfr->notify_has_serial = 0;
3475                 xfr->notify_serial = 0;
3476         } else if(xfr->notify_received && !xfr->notify_has_serial) {
3477                 /* we already have notify without serial, keep it
3478                  * that way; no serial check when current operation
3479                  * is done */
3480         } else {
3481                 xfr->notify_received = 1;
3482                 xfr->notify_has_serial = has_serial;
3483                 xfr->notify_serial = serial;
3484         }
3485 }
3486
3487 /** process a notify serial, start new probe or note serial. xfr is locked */
3488 static void
3489 xfr_process_notify(struct auth_xfer* xfr, struct module_env* env,
3490         int has_serial, uint32_t serial, struct auth_master* fromhost)
3491 {
3492         /* if the serial of notify is older than we have, don't fetch
3493          * a zone, we already have it */
3494         if(has_serial && !xfr_serial_means_update(xfr, serial)) {
3495                 lock_basic_unlock(&xfr->lock);
3496                 return;
3497         }
3498         /* start new probe with this addr src, or note serial */
3499         if(!xfr_start_probe(xfr, env, fromhost)) {
3500                 /* not started because already in progress, note the serial */
3501                 xfr_note_notify_serial(xfr, has_serial, serial);
3502                 lock_basic_unlock(&xfr->lock);
3503         }
3504         /* successful end of start_probe unlocked xfr->lock */
3505 }
3506
3507 int auth_zones_notify(struct auth_zones* az, struct module_env* env,
3508         uint8_t* nm, size_t nmlen, uint16_t dclass,
3509         struct sockaddr_storage* addr, socklen_t addrlen, int has_serial,
3510         uint32_t serial, int* refused)
3511 {
3512         struct auth_xfer* xfr;
3513         struct auth_master* fromhost = NULL;
3514         /* see which zone this is */
3515         lock_rw_rdlock(&az->lock);
3516         xfr = auth_xfer_find(az, nm, nmlen, dclass);
3517         if(!xfr) {
3518                 lock_rw_unlock(&az->lock);
3519                 /* no such zone, refuse the notify */
3520                 *refused = 1;
3521                 return 0;
3522         }
3523         lock_basic_lock(&xfr->lock);
3524         lock_rw_unlock(&az->lock);
3525
3526         /* check access list for notifies */
3527         if(!az_xfr_allowed_notify(xfr, addr, addrlen, &fromhost)) {
3528                 lock_basic_unlock(&xfr->lock);
3529                 /* notify not allowed, refuse the notify */
3530                 *refused = 1;
3531                 return 0;
3532         }
3533
3534         /* process the notify */
3535         xfr_process_notify(xfr, env, has_serial, serial, fromhost);
3536         return 1;
3537 }
3538
3539 int auth_zones_startprobesequence(struct auth_zones* az,
3540         struct module_env* env, uint8_t* nm, size_t nmlen, uint16_t dclass)
3541 {
3542         struct auth_xfer* xfr;
3543         lock_rw_rdlock(&az->lock);
3544         xfr = auth_xfer_find(az, nm, nmlen, dclass);
3545         if(!xfr) {
3546                 lock_rw_unlock(&az->lock);
3547                 return 0;
3548         }
3549         lock_basic_lock(&xfr->lock);
3550         lock_rw_unlock(&az->lock);
3551
3552         xfr_process_notify(xfr, env, 0, 0, NULL);
3553         return 1;
3554 }
3555
3556 /** set a zone expired */
3557 static void
3558 auth_xfer_set_expired(struct auth_xfer* xfr, struct module_env* env,
3559         int expired)
3560 {
3561         struct auth_zone* z;
3562
3563         /* expire xfr */
3564         lock_basic_lock(&xfr->lock);
3565         xfr->zone_expired = expired;
3566         lock_basic_unlock(&xfr->lock);
3567
3568         /* find auth_zone */
3569         lock_rw_rdlock(&env->auth_zones->lock);
3570         z = auth_zone_find(env->auth_zones, xfr->name, xfr->namelen,
3571                 xfr->dclass);
3572         if(!z) {
3573                 lock_rw_unlock(&env->auth_zones->lock);
3574                 return;
3575         }
3576         lock_rw_wrlock(&z->lock);
3577         lock_rw_unlock(&env->auth_zones->lock);
3578
3579         /* expire auth_zone */
3580         z->zone_expired = expired;
3581         lock_rw_unlock(&z->lock);
3582 }
3583
3584 /** find master (from notify or probe) in list of masters */
3585 static struct auth_master*
3586 find_master_by_host(struct auth_master* list, char* host)
3587 {
3588         struct auth_master* p;
3589         for(p=list; p; p=p->next) {
3590                 if(strcmp(p->host, host) == 0)
3591                         return p;
3592         }
3593         return NULL;
3594 }
3595
3596 /** delete the looked up auth_addrs for all the masters in the list */
3597 static void
3598 xfr_masterlist_free_addrs(struct auth_master* list)
3599 {
3600         struct auth_master* m;
3601         for(m=list; m; m=m->next) {
3602                 if(m->list) {
3603                         auth_free_master_addrs(m->list);
3604                         m->list = NULL;
3605                 }
3606         }
3607 }
3608
3609 /** copy a list of auth_addrs */
3610 static struct auth_addr*
3611 auth_addr_list_copy(struct auth_addr* source)
3612 {
3613         struct auth_addr* list = NULL, *last = NULL;
3614         struct auth_addr* p;
3615         for(p=source; p; p=p->next) {
3616                 struct auth_addr* a = (struct auth_addr*)memdup(p, sizeof(*p));
3617                 if(!a) {
3618                         log_err("malloc failure");
3619                         auth_free_master_addrs(list);
3620                         return NULL;
3621                 }
3622                 a->next = NULL;
3623                 if(last) last->next = a;
3624                 if(!list) list = a;
3625                 last = a;
3626         }
3627         return list;
3628 }
3629
3630 /** copy a master to a new structure, NULL on alloc failure */
3631 static struct auth_master*
3632 auth_master_copy(struct auth_master* o)
3633 {
3634         struct auth_master* m;
3635         if(!o) return NULL;
3636         m = (struct auth_master*)memdup(o, sizeof(*o));
3637         if(!m) {
3638                 log_err("malloc failure");
3639                 return NULL;
3640         }
3641         m->next = NULL;
3642         if(m->host) {
3643                 m->host = strdup(m->host);
3644                 if(!m->host) {
3645                         free(m);
3646                         log_err("malloc failure");
3647                         return NULL;
3648                 }
3649         }
3650         if(m->file) {
3651                 m->file = strdup(m->file);
3652                 if(!m->file) {
3653                         free(m->host);
3654                         free(m);
3655                         log_err("malloc failure");
3656                         return NULL;
3657                 }
3658         }
3659         if(m->list) {
3660                 m->list = auth_addr_list_copy(m->list);
3661                 if(!m->list) {
3662                         free(m->file);
3663                         free(m->host);
3664                         free(m);
3665                         return NULL;
3666                 }
3667         }
3668         return m;
3669 }
3670
3671 /** copy the master addresses from the task_probe lookups to the allow_notify
3672  * list of masters */
3673 static void
3674 probe_copy_masters_for_allow_notify(struct auth_xfer* xfr)
3675 {
3676         struct auth_master* list = NULL, *last = NULL;
3677         struct auth_master* p;
3678         /* build up new list with copies */
3679         for(p = xfr->task_probe->masters; p; p=p->next) {
3680                 struct auth_master* m = auth_master_copy(p);
3681                 if(!m) {
3682                         auth_free_masters(list);
3683                         /* failed because of malloc failure, use old list */
3684                         return;
3685                 }
3686                 m->next = NULL;
3687                 if(last) last->next = m;
3688                 if(!list) list = m;
3689                 last = m;
3690         }
3691         /* success, replace list */
3692         auth_free_masters(xfr->allow_notify_list);
3693         xfr->allow_notify_list = list;
3694 }
3695
3696 /** start the lookups for task_transfer */
3697 static void
3698 xfr_transfer_start_lookups(struct auth_xfer* xfr)
3699 {
3700         /* delete all the looked up addresses in the list */
3701         xfr_masterlist_free_addrs(xfr->task_transfer->masters);
3702
3703         /* start lookup at the first master */
3704         xfr->task_transfer->lookup_target = xfr->task_transfer->masters;
3705         xfr->task_transfer->lookup_aaaa = 0;
3706 }
3707
3708 /** move to the next lookup of hostname for task_transfer */
3709 static void
3710 xfr_transfer_move_to_next_lookup(struct auth_xfer* xfr, struct module_env* env)
3711 {
3712         if(!xfr->task_transfer->lookup_target)
3713                 return; /* already at end of list */
3714         if(!xfr->task_transfer->lookup_aaaa && env->cfg->do_ip6) {
3715                 /* move to lookup AAAA */
3716                 xfr->task_transfer->lookup_aaaa = 1;
3717                 return;
3718         }
3719         xfr->task_transfer->lookup_target =
3720                 xfr->task_transfer->lookup_target->next;
3721         xfr->task_transfer->lookup_aaaa = 0;
3722         if(!env->cfg->do_ip4 && xfr->task_transfer->lookup_target!=NULL)
3723                 xfr->task_transfer->lookup_aaaa = 1;
3724 }
3725
3726 /** start the lookups for task_probe */
3727 static void
3728 xfr_probe_start_lookups(struct auth_xfer* xfr)
3729 {
3730         /* delete all the looked up addresses in the list */
3731         xfr_masterlist_free_addrs(xfr->task_probe->masters);
3732
3733         /* start lookup at the first master */
3734         xfr->task_probe->lookup_target = xfr->task_probe->masters;
3735         xfr->task_probe->lookup_aaaa = 0;
3736 }
3737
3738 /** move to the next lookup of hostname for task_probe */
3739 static void
3740 xfr_probe_move_to_next_lookup(struct auth_xfer* xfr, struct module_env* env)
3741 {
3742         if(!xfr->task_probe->lookup_target)
3743                 return; /* already at end of list */
3744         if(!xfr->task_probe->lookup_aaaa && env->cfg->do_ip6) {
3745                 /* move to lookup AAAA */
3746                 xfr->task_probe->lookup_aaaa = 1;
3747                 return;
3748         }
3749         xfr->task_probe->lookup_target = xfr->task_probe->lookup_target->next;
3750         xfr->task_probe->lookup_aaaa = 0;
3751         if(!env->cfg->do_ip4 && xfr->task_probe->lookup_target!=NULL)
3752                 xfr->task_probe->lookup_aaaa = 1;
3753 }
3754
3755 /** start the iteration of the task_transfer list of masters */
3756 static void
3757 xfr_transfer_start_list(struct auth_xfer* xfr, struct auth_master* spec)
3758 {
3759         if(spec) {
3760                 xfr->task_transfer->scan_specific = find_master_by_host(
3761                         xfr->task_transfer->masters, spec->host);
3762                 if(xfr->task_transfer->scan_specific) {
3763                         xfr->task_transfer->scan_target = NULL;
3764                         xfr->task_transfer->scan_addr = NULL;
3765                         if(xfr->task_transfer->scan_specific->list)
3766                                 xfr->task_transfer->scan_addr =
3767                                         xfr->task_transfer->scan_specific->list;
3768                         return;
3769                 }
3770         }
3771         /* no specific (notified) host to scan */
3772         xfr->task_transfer->scan_specific = NULL;
3773         xfr->task_transfer->scan_addr = NULL;
3774         /* pick up first scan target */
3775         xfr->task_transfer->scan_target = xfr->task_transfer->masters;
3776         if(xfr->task_transfer->scan_target && xfr->task_transfer->
3777                 scan_target->list)
3778                 xfr->task_transfer->scan_addr =
3779                         xfr->task_transfer->scan_target->list;
3780 }
3781
3782 /** start the iteration of the task_probe list of masters */
3783 static void
3784 xfr_probe_start_list(struct auth_xfer* xfr, struct auth_master* spec)
3785 {
3786         if(spec) {
3787                 xfr->task_probe->scan_specific = find_master_by_host(
3788                         xfr->task_probe->masters, spec->host);
3789                 if(xfr->task_probe->scan_specific) {
3790                         xfr->task_probe->scan_target = NULL;
3791                         xfr->task_probe->scan_addr = NULL;
3792                         if(xfr->task_probe->scan_specific->list)
3793                                 xfr->task_probe->scan_addr =
3794                                         xfr->task_probe->scan_specific->list;
3795                         return;
3796                 }
3797         }
3798         /* no specific (notified) host to scan */
3799         xfr->task_probe->scan_specific = NULL;
3800         xfr->task_probe->scan_addr = NULL;
3801         /* pick up first scan target */
3802         xfr->task_probe->scan_target = xfr->task_probe->masters;
3803         if(xfr->task_probe->scan_target && xfr->task_probe->scan_target->list)
3804                 xfr->task_probe->scan_addr =
3805                         xfr->task_probe->scan_target->list;
3806 }
3807
3808 /** pick up the master that is being scanned right now, task_transfer */
3809 static struct auth_master*
3810 xfr_transfer_current_master(struct auth_xfer* xfr)
3811 {
3812         if(xfr->task_transfer->scan_specific)
3813                 return xfr->task_transfer->scan_specific;
3814         return xfr->task_transfer->scan_target;
3815 }
3816
3817 /** pick up the master that is being scanned right now, task_probe */
3818 static struct auth_master*
3819 xfr_probe_current_master(struct auth_xfer* xfr)
3820 {
3821         if(xfr->task_probe->scan_specific)
3822                 return xfr->task_probe->scan_specific;
3823         return xfr->task_probe->scan_target;
3824 }
3825
3826 /** true if at end of list, task_transfer */
3827 static int
3828 xfr_transfer_end_of_list(struct auth_xfer* xfr)
3829 {
3830         return !xfr->task_transfer->scan_specific &&
3831                 !xfr->task_transfer->scan_target;
3832 }
3833
3834 /** true if at end of list, task_probe */
3835 static int
3836 xfr_probe_end_of_list(struct auth_xfer* xfr)
3837 {
3838         return !xfr->task_probe->scan_specific && !xfr->task_probe->scan_target;
3839 }
3840
3841 /** move to next master in list, task_transfer */
3842 static void
3843 xfr_transfer_nextmaster(struct auth_xfer* xfr)
3844 {
3845         if(!xfr->task_transfer->scan_specific &&
3846                 !xfr->task_transfer->scan_target)
3847                 return;
3848         if(xfr->task_transfer->scan_addr) {
3849                 xfr->task_transfer->scan_addr =
3850                         xfr->task_transfer->scan_addr->next;
3851                 if(xfr->task_transfer->scan_addr)
3852                         return;
3853         }
3854         if(xfr->task_transfer->scan_specific) {
3855                 xfr->task_transfer->scan_specific = NULL;
3856                 xfr->task_transfer->scan_target = xfr->task_transfer->masters;
3857                 if(xfr->task_transfer->scan_target && xfr->task_transfer->
3858                         scan_target->list)
3859                         xfr->task_transfer->scan_addr =
3860                                 xfr->task_transfer->scan_target->list;
3861                 return;
3862         }
3863         if(!xfr->task_transfer->scan_target)
3864                 return;
3865         xfr->task_transfer->scan_target = xfr->task_transfer->scan_target->next;
3866         if(xfr->task_transfer->scan_target && xfr->task_transfer->
3867                 scan_target->list)
3868                 xfr->task_transfer->scan_addr =
3869                         xfr->task_transfer->scan_target->list;
3870         return;
3871 }
3872
3873 /** move to next master in list, task_probe */
3874 static void
3875 xfr_probe_nextmaster(struct auth_xfer* xfr)
3876 {
3877         if(!xfr->task_probe->scan_specific && !xfr->task_probe->scan_target)
3878                 return;
3879         if(xfr->task_probe->scan_addr) {
3880                 xfr->task_probe->scan_addr = xfr->task_probe->scan_addr->next;
3881                 if(xfr->task_probe->scan_addr)
3882                         return;
3883         }
3884         if(xfr->task_probe->scan_specific) {
3885                 xfr->task_probe->scan_specific = NULL;
3886                 xfr->task_probe->scan_target = xfr->task_probe->masters;
3887                 if(xfr->task_probe->scan_target && xfr->task_probe->
3888                         scan_target->list)
3889                         xfr->task_probe->scan_addr =
3890                                 xfr->task_probe->scan_target->list;
3891                 return;
3892         }
3893         if(!xfr->task_probe->scan_target)
3894                 return;
3895         xfr->task_probe->scan_target = xfr->task_probe->scan_target->next;
3896         if(xfr->task_probe->scan_target && xfr->task_probe->
3897                 scan_target->list)
3898                 xfr->task_probe->scan_addr =
3899                         xfr->task_probe->scan_target->list;
3900         return;
3901 }
3902
3903 /** create SOA probe packet for xfr */
3904 static void
3905 xfr_create_soa_probe_packet(struct auth_xfer* xfr, sldns_buffer* buf,
3906         uint16_t id)
3907 {
3908         struct query_info qinfo;
3909
3910         memset(&qinfo, 0, sizeof(qinfo));
3911         qinfo.qname = xfr->name;
3912         qinfo.qname_len = xfr->namelen;
3913         qinfo.qtype = LDNS_RR_TYPE_SOA;
3914         qinfo.qclass = xfr->dclass;
3915         qinfo_query_encode(buf, &qinfo);
3916         sldns_buffer_write_u16_at(buf, 0, id);
3917 }
3918
3919 /** create IXFR/AXFR packet for xfr */
3920 static void
3921 xfr_create_ixfr_packet(struct auth_xfer* xfr, sldns_buffer* buf, uint16_t id,
3922         struct auth_master* master)
3923 {
3924         struct query_info qinfo;
3925         uint32_t serial;
3926         int have_zone;
3927         have_zone = xfr->have_zone;
3928         serial = xfr->serial;
3929
3930         memset(&qinfo, 0, sizeof(qinfo));
3931         qinfo.qname = xfr->name;
3932         qinfo.qname_len = xfr->namelen;
3933         xfr->task_transfer->got_xfr_serial = 0;
3934         xfr->task_transfer->rr_scan_num = 0;
3935         xfr->task_transfer->incoming_xfr_serial = 0;
3936         xfr->task_transfer->on_ixfr_is_axfr = 0;
3937         xfr->task_transfer->on_ixfr = 1;
3938         qinfo.qtype = LDNS_RR_TYPE_IXFR;
3939         if(!have_zone || xfr->task_transfer->ixfr_fail || !master->ixfr) {
3940                 qinfo.qtype = LDNS_RR_TYPE_AXFR;
3941                 xfr->task_transfer->ixfr_fail = 0;
3942                 xfr->task_transfer->on_ixfr = 0;
3943         }
3944
3945         qinfo.qclass = xfr->dclass;
3946         qinfo_query_encode(buf, &qinfo);
3947         sldns_buffer_write_u16_at(buf, 0, id);
3948
3949         /* append serial for IXFR */
3950         if(qinfo.qtype == LDNS_RR_TYPE_IXFR) {
3951                 size_t end = sldns_buffer_limit(buf);
3952                 sldns_buffer_clear(buf);
3953                 sldns_buffer_set_position(buf, end);
3954                 /* auth section count 1 */
3955                 sldns_buffer_write_u16_at(buf, LDNS_NSCOUNT_OFF, 1);
3956                 /* write SOA */
3957                 sldns_buffer_write_u8(buf, 0xC0); /* compressed ptr to qname */
3958                 sldns_buffer_write_u8(buf, 0x0C);
3959                 sldns_buffer_write_u16(buf, LDNS_RR_TYPE_SOA);
3960                 sldns_buffer_write_u16(buf, qinfo.qclass);
3961                 sldns_buffer_write_u32(buf, 0); /* ttl */
3962                 sldns_buffer_write_u16(buf, 22); /* rdata length */
3963                 sldns_buffer_write_u8(buf, 0); /* . */
3964                 sldns_buffer_write_u8(buf, 0); /* . */
3965                 sldns_buffer_write_u32(buf, serial); /* serial */
3966                 sldns_buffer_write_u32(buf, 0); /* refresh */
3967                 sldns_buffer_write_u32(buf, 0); /* retry */
3968                 sldns_buffer_write_u32(buf, 0); /* expire */
3969                 sldns_buffer_write_u32(buf, 0); /* minimum */
3970                 sldns_buffer_flip(buf);
3971         }
3972 }
3973
3974 /** check if returned packet is OK */
3975 static int
3976 check_packet_ok(sldns_buffer* pkt, uint16_t qtype, struct auth_xfer* xfr,
3977         uint32_t* serial)
3978 {
3979         /* parse to see if packet worked, valid reply */
3980
3981         /* check serial number of SOA */
3982         if(sldns_buffer_limit(pkt) < LDNS_HEADER_SIZE)
3983                 return 0;
3984
3985         /* check ID */
3986         if(LDNS_ID_WIRE(sldns_buffer_begin(pkt)) != xfr->task_probe->id)
3987                 return 0;
3988
3989         /* check flag bits and rcode */
3990         if(!LDNS_QR_WIRE(sldns_buffer_begin(pkt)))
3991                 return 0;
3992         if(LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_QUERY)
3993                 return 0;
3994         if(LDNS_RCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_RCODE_NOERROR)
3995                 return 0;
3996
3997         /* check qname */
3998         if(LDNS_QDCOUNT(sldns_buffer_begin(pkt)) != 1)
3999                 return 0;
4000         sldns_buffer_skip(pkt, LDNS_HEADER_SIZE);
4001         if(sldns_buffer_remaining(pkt) < xfr->namelen)
4002                 return 0;
4003         if(query_dname_compare(sldns_buffer_current(pkt), xfr->name) != 0)
4004                 return 0;
4005         sldns_buffer_skip(pkt, (ssize_t)xfr->namelen);
4006
4007         /* check qtype, qclass */
4008         if(sldns_buffer_remaining(pkt) < 4)
4009                 return 0;
4010         if(sldns_buffer_read_u16(pkt) != qtype)
4011                 return 0;
4012         if(sldns_buffer_read_u16(pkt) != xfr->dclass)
4013                 return 0;
4014
4015         if(serial) {
4016                 uint16_t rdlen;
4017                 /* read serial number, from answer section SOA */
4018                 if(LDNS_ANCOUNT(sldns_buffer_begin(pkt)) == 0)
4019                         return 0;
4020                 /* read from first record SOA record */
4021                 if(sldns_buffer_remaining(pkt) < 1)
4022                         return 0;
4023                 if(dname_pkt_compare(pkt, sldns_buffer_current(pkt),
4024                         xfr->name) != 0)
4025                         return 0;
4026                 if(!pkt_dname_len(pkt))
4027                         return 0;
4028                 /* type, class, ttl, rdatalen */
4029                 if(sldns_buffer_remaining(pkt) < 4+4+2)
4030                         return 0;
4031                 if(sldns_buffer_read_u16(pkt) != qtype)
4032                         return 0;
4033                 if(sldns_buffer_read_u16(pkt) != xfr->dclass)
4034                         return 0;
4035                 sldns_buffer_skip(pkt, 4); /* ttl */
4036                 rdlen = sldns_buffer_read_u16(pkt);
4037                 if(sldns_buffer_remaining(pkt) < rdlen)
4038                         return 0;
4039                 if(sldns_buffer_remaining(pkt) < 1)
4040                         return 0;
4041                 if(!pkt_dname_len(pkt)) /* soa name */
4042                         return 0;
4043                 if(sldns_buffer_remaining(pkt) < 1)
4044                         return 0;
4045                 if(!pkt_dname_len(pkt)) /* soa name */
4046                         return 0;
4047                 if(sldns_buffer_remaining(pkt) < 20)
4048                         return 0;
4049                 *serial = sldns_buffer_read_u32(pkt);
4050         }
4051         return 1;
4052 }
4053
4054 /** read one line from chunks into buffer at current position */
4055 static int
4056 chunkline_get_line(struct auth_chunk** chunk, size_t* chunk_pos,
4057         sldns_buffer* buf)
4058 {
4059         int readsome = 0;
4060         while(*chunk) {
4061                 /* more text in this chunk? */
4062                 if(*chunk_pos < (*chunk)->len) {
4063                         readsome = 1;
4064                         while(*chunk_pos < (*chunk)->len) {
4065                                 char c = (char)((*chunk)->data[*chunk_pos]);
4066                                 (*chunk_pos)++;
4067                                 if(sldns_buffer_remaining(buf) < 2) {
4068                                         /* buffer too short */
4069                                         verbose(VERB_ALGO, "http chunkline, "
4070                                                 "line too long");
4071                                         return 0;
4072                                 }
4073                                 sldns_buffer_write_u8(buf, (uint8_t)c);
4074                                 if(c == '\n') {
4075                                         /* we are done */
4076                                         return 1;
4077                                 }
4078                         }
4079                 }
4080                 /* move to next chunk */
4081                 *chunk = (*chunk)->next;
4082                 *chunk_pos = 0;
4083         }
4084         /* no more text */
4085         if(readsome) return 1;
4086         return 0;
4087 }
4088
4089 /** count number of open and closed parenthesis in a chunkline */
4090 static int
4091 chunkline_count_parens(sldns_buffer* buf, size_t start)
4092 {
4093         size_t end = sldns_buffer_position(buf);
4094         size_t i;
4095         int count = 0;
4096         int squote = 0, dquote = 0;
4097         for(i=start; i<end; i++) {
4098                 char c = (char)sldns_buffer_read_u8_at(buf, i);
4099                 if(squote && c != '\'') continue;
4100                 if(dquote && c != '"') continue;
4101                 if(c == '"')
4102                         dquote = !dquote; /* skip quoted part */
4103                 else if(c == '\'')
4104                         squote = !squote; /* skip quoted part */
4105                 else if(c == '(')
4106                         count ++;
4107                 else if(c == ')')
4108                         count --;
4109                 else if(c == ';') {
4110                         /* rest is a comment */
4111                         return count;
4112                 }
4113         }
4114         return count;
4115 }
4116
4117 /** remove trailing ;... comment from a line in the chunkline buffer */
4118 static void
4119 chunkline_remove_trailcomment(sldns_buffer* buf, size_t start)
4120 {
4121         size_t end = sldns_buffer_position(buf);
4122         size_t i;
4123         int squote = 0, dquote = 0;
4124         for(i=start; i<end; i++) {
4125                 char c = (char)sldns_buffer_read_u8_at(buf, i);
4126                 if(squote && c != '\'') continue;
4127                 if(dquote && c != '"') continue;
4128                 if(c == '"')
4129                         dquote = !dquote; /* skip quoted part */
4130                 else if(c == '\'')
4131                         squote = !squote; /* skip quoted part */
4132                 else if(c == ';') {
4133                         /* rest is a comment */
4134                         sldns_buffer_set_position(buf, i);
4135                         return;
4136                 }
4137         }
4138         /* nothing to remove */
4139 }
4140
4141 /** see if a chunkline is a comment line (or empty line) */
4142 static int
4143 chunkline_is_comment_line_or_empty(sldns_buffer* buf)
4144 {
4145         size_t i, end = sldns_buffer_limit(buf);
4146         for(i=0; i<end; i++) {
4147                 char c = (char)sldns_buffer_read_u8_at(buf, i);
4148                 if(c == ';')
4149                         return 1; /* comment */
4150                 else if(c != ' ' && c != '\t' && c != '\r' && c != '\n')
4151                         return 0; /* not a comment */
4152         }
4153         return 1; /* empty */
4154 }
4155
4156 /** find a line with ( ) collated */
4157 static int
4158 chunkline_get_line_collated(struct auth_chunk** chunk, size_t* chunk_pos,
4159         sldns_buffer* buf)
4160 {
4161         size_t pos;
4162         int parens = 0;
4163         sldns_buffer_clear(buf);
4164         pos = sldns_buffer_position(buf);
4165         if(!chunkline_get_line(chunk, chunk_pos, buf)) {
4166                 if(sldns_buffer_position(buf) < sldns_buffer_limit(buf))
4167                         sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf), 0);
4168                 else sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf)-1, 0);
4169                 sldns_buffer_flip(buf);
4170                 return 0;
4171         }
4172         parens += chunkline_count_parens(buf, pos);
4173         while(parens > 0) {
4174                 chunkline_remove_trailcomment(buf, pos);
4175                 pos = sldns_buffer_position(buf);
4176                 if(!chunkline_get_line(chunk, chunk_pos, buf)) {
4177                         if(sldns_buffer_position(buf) < sldns_buffer_limit(buf))
4178                                 sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf), 0);
4179                         else sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf)-1, 0);
4180                         sldns_buffer_flip(buf);
4181                         return 0;
4182                 }
4183                 parens += chunkline_count_parens(buf, pos);
4184         }
4185
4186         if(sldns_buffer_remaining(buf) < 1) {
4187                 verbose(VERB_ALGO, "http chunkline: "
4188                         "line too long");
4189                 return 0;
4190         }
4191         sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf), 0);
4192         sldns_buffer_flip(buf);
4193         return 1;
4194 }
4195
4196 /** process $ORIGIN for http */
4197 static int
4198 http_parse_origin(sldns_buffer* buf, struct sldns_file_parse_state* pstate)
4199 {
4200         char* line = (char*)sldns_buffer_begin(buf);
4201         if(strncmp(line, "$ORIGIN", 7) == 0 &&
4202                 isspace((unsigned char)line[7])) {
4203                 int s;
4204                 pstate->origin_len = sizeof(pstate->origin);
4205                 s = sldns_str2wire_dname_buf(sldns_strip_ws(line+8),
4206                         pstate->origin, &pstate->origin_len);
4207                 if(s) pstate->origin_len = 0;
4208                 return 1;
4209         }
4210         return 0;
4211 }
4212
4213 /** process $TTL for http */
4214 static int
4215 http_parse_ttl(sldns_buffer* buf, struct sldns_file_parse_state* pstate)
4216 {
4217         char* line = (char*)sldns_buffer_begin(buf);
4218         if(strncmp(line, "$TTL", 4) == 0 &&
4219                 isspace((unsigned char)line[4])) {
4220                 const char* end = NULL;
4221                 pstate->default_ttl = sldns_str2period(
4222                         sldns_strip_ws(line+5), &end);
4223                 return 1;
4224         }
4225         return 0;
4226 }
4227
4228 /** find noncomment RR line in chunks, collates lines if ( ) format */
4229 static int
4230 chunkline_non_comment_RR(struct auth_chunk** chunk, size_t* chunk_pos,
4231         sldns_buffer* buf, struct sldns_file_parse_state* pstate)
4232 {
4233         while(chunkline_get_line_collated(chunk, chunk_pos, buf)) {
4234                 if(chunkline_is_comment_line_or_empty(buf)) {
4235                         /* a comment, go to next line */
4236                         continue;
4237                 }
4238                 if(http_parse_origin(buf, pstate)) {
4239                         continue; /* $ORIGIN has been handled */
4240                 }
4241                 if(http_parse_ttl(buf, pstate)) {
4242                         continue; /* $TTL has been handled */
4243                 }
4244                 return 1;
4245         }
4246         /* no noncomments, fail */
4247         return 0;
4248 }
4249
4250 /** check syntax of chunklist zonefile, parse first RR, return false on
4251  * failure and return a string in the scratch buffer (first RR string)
4252  * on failure. */
4253 static int
4254 http_zonefile_syntax_check(struct auth_xfer* xfr, sldns_buffer* buf)
4255 {
4256         uint8_t rr[LDNS_RR_BUF_SIZE];
4257         size_t rr_len, dname_len = 0;
4258         struct sldns_file_parse_state pstate;
4259         struct auth_chunk* chunk;
4260         size_t chunk_pos;
4261         int e;
4262         memset(&pstate, 0, sizeof(pstate));
4263         pstate.default_ttl = 3600;
4264         if(xfr->namelen < sizeof(pstate.origin)) {
4265                 pstate.origin_len = xfr->namelen;
4266                 memmove(pstate.origin, xfr->name, xfr->namelen);
4267         }
4268         chunk = xfr->task_transfer->chunks_first;
4269         chunk_pos = 0;
4270         if(!chunkline_non_comment_RR(&chunk, &chunk_pos, buf, &pstate)) {
4271                 return 0;
4272         }
4273         rr_len = sizeof(rr);
4274         e=sldns_str2wire_rr_buf((char*)sldns_buffer_begin(buf), rr, &rr_len,
4275                 &dname_len, pstate.default_ttl,
4276                 pstate.origin_len?pstate.origin:NULL, pstate.origin_len,
4277                 pstate.prev_rr_len?pstate.prev_rr:NULL, pstate.prev_rr_len);
4278         if(e != 0) {
4279                 log_err("parse failure on first RR[%d]: %s",
4280                         LDNS_WIREPARSE_OFFSET(e),
4281                         sldns_get_errorstr_parse(LDNS_WIREPARSE_ERROR(e)));
4282                 return 0;
4283         }
4284         /* check that class is correct */
4285         if(sldns_wirerr_get_class(rr, rr_len, dname_len) != xfr->dclass) {
4286                 log_err("parse failure: first record in downloaded zonefile "
4287                         "from wrong RR class");
4288                 return 0;
4289         }
4290         return 1;
4291 }
4292
4293 /** sum sizes of chunklist */
4294 static size_t
4295 chunklist_sum(struct auth_chunk* list)
4296 {
4297         struct auth_chunk* p;
4298         size_t s = 0;
4299         for(p=list; p; p=p->next) {
4300                 s += p->len;
4301         }
4302         return s;
4303 }
4304
4305 /** remove newlines from collated line */
4306 static void
4307 chunkline_newline_removal(sldns_buffer* buf)
4308 {
4309         size_t i, end=sldns_buffer_limit(buf);
4310         for(i=0; i<end; i++) {
4311                 char c = (char)sldns_buffer_read_u8_at(buf, i);
4312                 if(c == '\n' && i==end-1) {
4313                         sldns_buffer_write_u8_at(buf, i, 0);
4314                         sldns_buffer_set_limit(buf, end-1);
4315                         return;
4316                 }
4317                 if(c == '\n')
4318                         sldns_buffer_write_u8_at(buf, i, (uint8_t)' ');
4319         }
4320 }
4321
4322 /** for http download, parse and add RR to zone */
4323 static int
4324 http_parse_add_rr(struct auth_xfer* xfr, struct auth_zone* z,
4325         sldns_buffer* buf, struct sldns_file_parse_state* pstate)
4326 {
4327         uint8_t rr[LDNS_RR_BUF_SIZE];
4328         size_t rr_len, dname_len = 0;
4329         int e;
4330         char* line = (char*)sldns_buffer_begin(buf);
4331         rr_len = sizeof(rr);
4332         e = sldns_str2wire_rr_buf(line, rr, &rr_len, &dname_len,
4333                 pstate->default_ttl,
4334                 pstate->origin_len?pstate->origin:NULL, pstate->origin_len,
4335                 pstate->prev_rr_len?pstate->prev_rr:NULL, pstate->prev_rr_len);
4336         if(e != 0) {
4337                 log_err("%s/%s parse failure RR[%d]: %s in '%s'",
4338                         xfr->task_transfer->master->host,
4339                         xfr->task_transfer->master->file,
4340                         LDNS_WIREPARSE_OFFSET(e),
4341                         sldns_get_errorstr_parse(LDNS_WIREPARSE_ERROR(e)),
4342                         line);
4343                 return 0;
4344         }
4345         if(rr_len == 0)
4346                 return 1; /* empty line or so */
4347
4348         /* set prev */
4349         if(dname_len < sizeof(pstate->prev_rr)) {
4350                 memmove(pstate->prev_rr, rr, dname_len);
4351                 pstate->prev_rr_len = dname_len;
4352         }
4353
4354         return az_insert_rr(z, rr, rr_len, dname_len, NULL);
4355 }
4356
4357 /** RR list iterator, returns RRs from answer section one by one from the
4358  * dns packets in the chunklist */
4359 static void
4360 chunk_rrlist_start(struct auth_xfer* xfr, struct auth_chunk** rr_chunk,
4361         int* rr_num, size_t* rr_pos)
4362 {
4363         *rr_chunk = xfr->task_transfer->chunks_first;
4364         *rr_num = 0;
4365         *rr_pos = 0;
4366 }
4367
4368 /** RR list iterator, see if we are at the end of the list */
4369 static int
4370 chunk_rrlist_end(struct auth_chunk* rr_chunk, int rr_num)
4371 {
4372         while(rr_chunk) {
4373                 if(rr_chunk->len < LDNS_HEADER_SIZE)
4374                         return 1;
4375                 if(rr_num < (int)LDNS_ANCOUNT(rr_chunk->data))
4376                         return 0;
4377                 /* no more RRs in this chunk */
4378                 /* continue with next chunk, see if it has RRs */
4379                 rr_chunk = rr_chunk->next;
4380                 rr_num = 0;
4381         }
4382         return 1;
4383 }
4384
4385 /** RR list iterator, move to next RR */
4386 static void
4387 chunk_rrlist_gonext(struct auth_chunk** rr_chunk, int* rr_num,
4388         size_t* rr_pos, size_t rr_nextpos)
4389 {
4390         /* already at end of chunks? */
4391         if(!*rr_chunk)
4392                 return;
4393         /* move within this chunk */
4394         if((*rr_chunk)->len >= LDNS_HEADER_SIZE &&
4395                 (*rr_num)+1 < (int)LDNS_ANCOUNT((*rr_chunk)->data)) {
4396                 (*rr_num) += 1;
4397                 *rr_pos = rr_nextpos;
4398                 return;
4399         }
4400         /* no more RRs in this chunk */
4401         /* continue with next chunk, see if it has RRs */
4402         if(*rr_chunk)
4403                 *rr_chunk = (*rr_chunk)->next;
4404         while(*rr_chunk) {
4405                 *rr_num = 0;
4406                 *rr_pos = 0;
4407                 if((*rr_chunk)->len >= LDNS_HEADER_SIZE &&
4408                         LDNS_ANCOUNT((*rr_chunk)->data) > 0) {
4409                         return;
4410                 }
4411                 *rr_chunk = (*rr_chunk)->next;
4412         }
4413 }
4414
4415 /** RR iterator, get current RR information, false on parse error */
4416 static int
4417 chunk_rrlist_get_current(struct auth_chunk* rr_chunk, int rr_num,
4418         size_t rr_pos, uint8_t** rr_dname, uint16_t* rr_type,
4419         uint16_t* rr_class, uint32_t* rr_ttl, uint16_t* rr_rdlen,
4420         uint8_t** rr_rdata, size_t* rr_nextpos)
4421 {
4422         sldns_buffer pkt;
4423         /* integrity checks on position */
4424         if(!rr_chunk) return 0;
4425         if(rr_chunk->len < LDNS_HEADER_SIZE) return 0;
4426         if(rr_num >= (int)LDNS_ANCOUNT(rr_chunk->data)) return 0;
4427         if(rr_pos >= rr_chunk->len) return 0;
4428
4429         /* fetch rr information */
4430         sldns_buffer_init_frm_data(&pkt, rr_chunk->data, rr_chunk->len);
4431         if(rr_pos == 0) {
4432                 size_t i;
4433                 /* skip question section */
4434                 sldns_buffer_set_position(&pkt, LDNS_HEADER_SIZE);
4435                 for(i=0; i<LDNS_QDCOUNT(rr_chunk->data); i++) {
4436                         if(pkt_dname_len(&pkt) == 0) return 0;
4437                         if(sldns_buffer_remaining(&pkt) < 4) return 0;
4438                         sldns_buffer_skip(&pkt, 4); /* type and class */
4439                 }
4440         } else  {
4441                 sldns_buffer_set_position(&pkt, rr_pos);
4442         }
4443         *rr_dname = sldns_buffer_current(&pkt);
4444         if(pkt_dname_len(&pkt) == 0) return 0;
4445         if(sldns_buffer_remaining(&pkt) < 10) return 0;
4446         *rr_type = sldns_buffer_read_u16(&pkt);
4447         *rr_class = sldns_buffer_read_u16(&pkt);
4448         *rr_ttl = sldns_buffer_read_u32(&pkt);
4449         *rr_rdlen = sldns_buffer_read_u16(&pkt);
4450         if(sldns_buffer_remaining(&pkt) < (*rr_rdlen)) return 0;
4451         *rr_rdata = sldns_buffer_current(&pkt);
4452         sldns_buffer_skip(&pkt, (ssize_t)(*rr_rdlen));
4453         *rr_nextpos = sldns_buffer_position(&pkt);
4454         return 1;
4455 }
4456
4457 /** print log message where we are in parsing the zone transfer */
4458 static void
4459 log_rrlist_position(const char* label, struct auth_chunk* rr_chunk,
4460         uint8_t* rr_dname, uint16_t rr_type, size_t rr_counter)
4461 {
4462         sldns_buffer pkt;
4463         size_t dlen;
4464         uint8_t buf[256];
4465         char str[256];
4466         char typestr[32];
4467         sldns_buffer_init_frm_data(&pkt, rr_chunk->data, rr_chunk->len);
4468         sldns_buffer_set_position(&pkt, (size_t)(rr_dname -
4469                 sldns_buffer_begin(&pkt)));
4470         if((dlen=pkt_dname_len(&pkt)) == 0) return;
4471         if(dlen >= sizeof(buf)) return;
4472         dname_pkt_copy(&pkt, buf, rr_dname);
4473         dname_str(buf, str);
4474         (void)sldns_wire2str_type_buf(rr_type, typestr, sizeof(typestr));
4475         verbose(VERB_ALGO, "%s at[%d] %s %s", label, (int)rr_counter,
4476                 str, typestr);
4477 }
4478
4479 /** check that start serial is OK for ixfr. we are at rr_counter == 0,
4480  * and we are going to check rr_counter == 1 (has to be type SOA) serial */
4481 static int
4482 ixfr_start_serial(struct auth_chunk* rr_chunk, int rr_num, size_t rr_pos,
4483         uint8_t* rr_dname, uint16_t rr_type, uint16_t rr_class,
4484         uint32_t rr_ttl, uint16_t rr_rdlen, uint8_t* rr_rdata,
4485         size_t rr_nextpos, uint32_t transfer_serial, uint32_t xfr_serial)
4486 {
4487         uint32_t startserial;
4488         /* move forward on RR */
4489         chunk_rrlist_gonext(&rr_chunk, &rr_num, &rr_pos, rr_nextpos);
4490         if(chunk_rrlist_end(rr_chunk, rr_num)) {
4491                 /* no second SOA */
4492                 verbose(VERB_OPS, "IXFR has no second SOA record");
4493                 return 0;
4494         }
4495         if(!chunk_rrlist_get_current(rr_chunk, rr_num, rr_pos,
4496                 &rr_dname, &rr_type, &rr_class, &rr_ttl, &rr_rdlen,
4497                 &rr_rdata, &rr_nextpos)) {
4498                 verbose(VERB_OPS, "IXFR cannot parse second SOA record");
4499                 /* failed to parse RR */
4500                 return 0;
4501         }
4502         if(rr_type != LDNS_RR_TYPE_SOA) {
4503                 verbose(VERB_OPS, "IXFR second record is not type SOA");
4504                 return 0;
4505         }
4506         if(rr_rdlen < 22) {
4507                 verbose(VERB_OPS, "IXFR, second SOA has short rdlength");
4508                 return 0; /* bad SOA rdlen */
4509         }
4510         startserial = sldns_read_uint32(rr_rdata+rr_rdlen-20);
4511         if(startserial == transfer_serial) {
4512                 /* empty AXFR, not an IXFR */
4513                 verbose(VERB_OPS, "IXFR second serial same as first");
4514                 return 0;
4515         }
4516         if(startserial != xfr_serial) {
4517                 /* wrong start serial, it does not match the serial in
4518                  * memory */
4519                 verbose(VERB_OPS, "IXFR is from serial %u to %u but %u "
4520                         "in memory, rejecting the zone transfer",
4521                         (unsigned)startserial, (unsigned)transfer_serial,
4522                         (unsigned)xfr_serial);
4523                 return 0;
4524         }
4525         /* everything OK in second SOA serial */
4526         return 1;
4527 }
4528
4529 /** apply IXFR to zone in memory. z is locked. false on failure(mallocfail) */
4530 static int
4531 apply_ixfr(struct auth_xfer* xfr, struct auth_zone* z,
4532         struct sldns_buffer* scratch_buffer)
4533 {
4534         struct auth_chunk* rr_chunk;
4535         int rr_num;
4536         size_t rr_pos;
4537         uint8_t* rr_dname, *rr_rdata;
4538         uint16_t rr_type, rr_class, rr_rdlen;
4539         uint32_t rr_ttl;
4540         size_t rr_nextpos;
4541         int have_transfer_serial = 0;
4542         uint32_t transfer_serial = 0;
4543         size_t rr_counter = 0;
4544         int delmode = 0;
4545         int softfail = 0;
4546
4547         /* start RR iterator over chunklist of packets */
4548         chunk_rrlist_start(xfr, &rr_chunk, &rr_num, &rr_pos);
4549         while(!chunk_rrlist_end(rr_chunk, rr_num)) {
4550                 if(!chunk_rrlist_get_current(rr_chunk, rr_num, rr_pos,
4551                         &rr_dname, &rr_type, &rr_class, &rr_ttl, &rr_rdlen,
4552                         &rr_rdata, &rr_nextpos)) {
4553                         /* failed to parse RR */
4554                         return 0;
4555                 }
4556                 if(verbosity>=7) log_rrlist_position("apply ixfr",
4557                         rr_chunk, rr_dname, rr_type, rr_counter);
4558                 /* twiddle add/del mode and check for start and end */
4559                 if(rr_counter == 0 && rr_type != LDNS_RR_TYPE_SOA)
4560                         return 0;
4561                 if(rr_counter == 1 && rr_type != LDNS_RR_TYPE_SOA) {
4562                         /* this is an AXFR returned from the IXFR master */
4563                         /* but that should already have been detected, by
4564                          * on_ixfr_is_axfr */
4565                         return 0;
4566                 }
4567                 if(rr_type == LDNS_RR_TYPE_SOA) {
4568                         uint32_t serial;
4569                         if(rr_rdlen < 22) return 0; /* bad SOA rdlen */
4570                         serial = sldns_read_uint32(rr_rdata+rr_rdlen-20);
4571                         if(have_transfer_serial == 0) {
4572                                 have_transfer_serial = 1;
4573                                 transfer_serial = serial;
4574                                 delmode = 1; /* gets negated below */
4575                                 /* check second RR before going any further */
4576                                 if(!ixfr_start_serial(rr_chunk, rr_num, rr_pos,
4577                                         rr_dname, rr_type, rr_class, rr_ttl,
4578                                         rr_rdlen, rr_rdata, rr_nextpos,
4579                                         transfer_serial, xfr->serial)) {
4580                                         return 0;
4581                                 }
4582                         } else if(transfer_serial == serial) {
4583                                 have_transfer_serial++;
4584                                 if(rr_counter == 1) {
4585                                         /* empty AXFR, with SOA; SOA; */
4586                                         /* should have been detected by
4587                                          * on_ixfr_is_axfr */
4588                                         return 0;
4589                                 }
4590                                 if(have_transfer_serial == 3) {
4591                                         /* see serial three times for end */
4592                                         /* eg. IXFR:
4593                                          *  SOA 3 start
4594                                          *  SOA 1 second RR, followed by del
4595                                          *  SOA 2 followed by add
4596                                          *  SOA 2 followed by del
4597                                          *  SOA 3 followed by add
4598                                          *  SOA 3 end */
4599                                         /* ended by SOA record */
4600                                         xfr->serial = transfer_serial;
4601                                         break;
4602                                 }
4603                         }
4604                         /* twiddle add/del mode */
4605                         /* switch from delete part to add part and back again
4606                          * just before the soa, it gets deleted and added too
4607                          * this means we switch to delete mode for the final
4608                          * SOA(so skip that one) */
4609                         delmode = !delmode;
4610                 }
4611                 /* process this RR */
4612                 /* if the RR is deleted twice or added twice, then we
4613                  * softfail, and continue with the rest of the IXFR, so
4614                  * that we serve something fairly nice during the refetch */
4615                 if(verbosity>=7) log_rrlist_position((delmode?"del":"add"),
4616                         rr_chunk, rr_dname, rr_type, rr_counter);
4617                 if(delmode) {
4618                         /* delete this RR */
4619                         int nonexist = 0;
4620                         if(!az_remove_rr_decompress(z, rr_chunk->data,
4621                                 rr_chunk->len, scratch_buffer, rr_dname,
4622                                 rr_type, rr_class, rr_ttl, rr_rdata, rr_rdlen,
4623                                 &nonexist)) {
4624                                 /* failed, malloc error or so */
4625                                 return 0;
4626                         }
4627                         if(nonexist) {
4628                                 /* it was removal of a nonexisting RR */
4629                                 if(verbosity>=4) log_rrlist_position(
4630                                         "IXFR error nonexistent RR",
4631                                         rr_chunk, rr_dname, rr_type, rr_counter);
4632                                 softfail = 1;
4633                         }
4634                 } else if(rr_counter != 0) {
4635                         /* skip first SOA RR for addition, it is added in
4636                          * the addition part near the end of the ixfr, when
4637                          * that serial is seen the second time. */
4638                         int duplicate = 0;
4639                         /* add this RR */
4640                         if(!az_insert_rr_decompress(z, rr_chunk->data,
4641                                 rr_chunk->len, scratch_buffer, rr_dname,
4642                                 rr_type, rr_class, rr_ttl, rr_rdata, rr_rdlen,
4643                                 &duplicate)) {
4644                                 /* failed, malloc error or so */
4645                                 return 0;
4646                         }
4647                         if(duplicate) {
4648                                 /* it was a duplicate */
4649                                 if(verbosity>=4) log_rrlist_position(
4650                                         "IXFR error duplicate RR",
4651                                         rr_chunk, rr_dname, rr_type, rr_counter);
4652                                 softfail = 1;
4653                         }
4654                 }
4655
4656                 rr_counter++;
4657                 chunk_rrlist_gonext(&rr_chunk, &rr_num, &rr_pos, rr_nextpos);
4658         }
4659         if(softfail) {
4660                 verbose(VERB_ALGO, "IXFR did not apply cleanly, fetching full zone");
4661                 return 0;
4662         }
4663         return 1;
4664 }
4665
4666 /** apply AXFR to zone in memory. z is locked. false on failure(mallocfail) */
4667 static int
4668 apply_axfr(struct auth_xfer* xfr, struct auth_zone* z,
4669         struct sldns_buffer* scratch_buffer)
4670 {
4671         struct auth_chunk* rr_chunk;
4672         int rr_num;
4673         size_t rr_pos;
4674         uint8_t* rr_dname, *rr_rdata;
4675         uint16_t rr_type, rr_class, rr_rdlen;
4676         uint32_t rr_ttl;
4677         uint32_t serial = 0;
4678         size_t rr_nextpos;
4679         size_t rr_counter = 0;
4680         int have_end_soa = 0;
4681
4682         /* clear the data tree */
4683         traverse_postorder(&z->data, auth_data_del, NULL);
4684         rbtree_init(&z->data, &auth_data_cmp);
4685         xfr->have_zone = 0;
4686         xfr->serial = 0;
4687
4688         /* insert all RRs in to the zone */
4689         /* insert the SOA only once, skip the last one */
4690         /* start RR iterator over chunklist of packets */
4691         chunk_rrlist_start(xfr, &rr_chunk, &rr_num, &rr_pos);
4692         while(!chunk_rrlist_end(rr_chunk, rr_num)) {
4693                 if(!chunk_rrlist_get_current(rr_chunk, rr_num, rr_pos,
4694                         &rr_dname, &rr_type, &rr_class, &rr_ttl, &rr_rdlen,
4695                         &rr_rdata, &rr_nextpos)) {
4696                         /* failed to parse RR */
4697                         return 0;
4698                 }
4699                 if(verbosity>=7) log_rrlist_position("apply_axfr",
4700                         rr_chunk, rr_dname, rr_type, rr_counter);
4701                 if(rr_type == LDNS_RR_TYPE_SOA) {
4702                         if(rr_counter != 0) {
4703                                 /* end of the axfr */
4704                                 have_end_soa = 1;
4705                                 break;
4706                         }
4707                         if(rr_rdlen < 22) return 0; /* bad SOA rdlen */
4708                         serial = sldns_read_uint32(rr_rdata+rr_rdlen-20);
4709                 }
4710
4711                 /* add this RR */
4712                 if(!az_insert_rr_decompress(z, rr_chunk->data, rr_chunk->len,
4713                         scratch_buffer, rr_dname, rr_type, rr_class, rr_ttl,
4714                         rr_rdata, rr_rdlen, NULL)) {
4715                         /* failed, malloc error or so */
4716                         return 0;
4717                 }
4718
4719                 rr_counter++;
4720                 chunk_rrlist_gonext(&rr_chunk, &rr_num, &rr_pos, rr_nextpos);
4721         }
4722         if(!have_end_soa) {
4723                 log_err("no end SOA record for AXFR");
4724                 return 0;
4725         }
4726
4727         xfr->serial = serial;
4728         xfr->have_zone = 1;
4729         return 1;
4730 }
4731
4732 /** apply HTTP to zone in memory. z is locked. false on failure(mallocfail) */
4733 static int
4734 apply_http(struct auth_xfer* xfr, struct auth_zone* z,
4735         struct sldns_buffer* scratch_buffer)
4736 {
4737         /* parse data in chunks */
4738         /* parse RR's and read into memory. ignore $INCLUDE from the
4739          * downloaded file*/
4740         struct sldns_file_parse_state pstate;
4741         struct auth_chunk* chunk;
4742         size_t chunk_pos;
4743         memset(&pstate, 0, sizeof(pstate));
4744         pstate.default_ttl = 3600;
4745         if(xfr->namelen < sizeof(pstate.origin)) {
4746                 pstate.origin_len = xfr->namelen;
4747                 memmove(pstate.origin, xfr->name, xfr->namelen);
4748         }
4749
4750         if(verbosity >= VERB_ALGO)
4751                 verbose(VERB_ALGO, "http download %s of size %d",
4752                 xfr->task_transfer->master->file,
4753                 (int)chunklist_sum(xfr->task_transfer->chunks_first));
4754         if(xfr->task_transfer->chunks_first && verbosity >= VERB_ALGO) {
4755                 char preview[1024];
4756                 if(xfr->task_transfer->chunks_first->len+1 > sizeof(preview)) {
4757                         memmove(preview, xfr->task_transfer->chunks_first->data,
4758                                 sizeof(preview)-1);
4759                         preview[sizeof(preview)-1]=0;
4760                 } else {
4761                         memmove(preview, xfr->task_transfer->chunks_first->data,
4762                                 xfr->task_transfer->chunks_first->len);
4763                         preview[xfr->task_transfer->chunks_first->len]=0;
4764                 }
4765                 log_info("auth zone http downloaded content preview: %s",
4766                         preview);
4767         }
4768
4769         /* perhaps a little syntax check before we try to apply the data? */
4770         if(!http_zonefile_syntax_check(xfr, scratch_buffer)) {
4771                 log_err("http download %s/%s does not contain a zonefile, "
4772                         "but got '%s'", xfr->task_transfer->master->host,
4773                         xfr->task_transfer->master->file,
4774                         sldns_buffer_begin(scratch_buffer));
4775                 return 0;
4776         }
4777
4778         /* clear the data tree */
4779         traverse_postorder(&z->data, auth_data_del, NULL);
4780         rbtree_init(&z->data, &auth_data_cmp);
4781         xfr->have_zone = 0;
4782         xfr->serial = 0;
4783
4784         chunk = xfr->task_transfer->chunks_first;
4785         chunk_pos = 0;
4786         pstate.lineno = 0;
4787         while(chunkline_get_line_collated(&chunk, &chunk_pos, scratch_buffer)) {
4788                 /* process this line */
4789                 pstate.lineno++;
4790                 chunkline_newline_removal(scratch_buffer);
4791                 if(chunkline_is_comment_line_or_empty(scratch_buffer)) {
4792                         continue;
4793                 }
4794                 /* parse line and add RR */
4795                 if(http_parse_origin(scratch_buffer, &pstate)) {
4796                         continue; /* $ORIGIN has been handled */
4797                 }
4798                 if(http_parse_ttl(scratch_buffer, &pstate)) {
4799                         continue; /* $TTL has been handled */
4800                 }
4801                 if(!http_parse_add_rr(xfr, z, scratch_buffer, &pstate)) {
4802                         verbose(VERB_ALGO, "error parsing line [%s:%d] %s",
4803                                 xfr->task_transfer->master->file,
4804                                 pstate.lineno,
4805                                 sldns_buffer_begin(scratch_buffer));
4806                         return 0;
4807                 }
4808         }
4809         return 1;
4810 }
4811
4812 /** write http chunks to zonefile to create downloaded file */
4813 static int
4814 auth_zone_write_chunks(struct auth_xfer* xfr, const char* fname)
4815 {
4816         FILE* out;
4817         struct auth_chunk* p;
4818         out = fopen(fname, "w");
4819         if(!out) {
4820                 log_err("could not open %s: %s", fname, strerror(errno));
4821                 return 0;
4822         }
4823         for(p = xfr->task_transfer->chunks_first; p ; p = p->next) {
4824                 if(!write_out(out, (char*)p->data, p->len)) {
4825                         log_err("could not write http download to %s", fname);
4826                         fclose(out);
4827                         return 0;
4828                 }
4829         }
4830         fclose(out);
4831         return 1;
4832 }
4833
4834 /** write to zonefile after zone has been updated */
4835 static void
4836 xfr_write_after_update(struct auth_xfer* xfr, struct module_env* env)
4837 {
4838         struct config_file* cfg = env->cfg;
4839         struct auth_zone* z;
4840         char tmpfile[1024];
4841         char* zfilename;
4842         lock_basic_unlock(&xfr->lock);
4843
4844         /* get lock again, so it is a readlock and concurrently queries
4845          * can be answered */
4846         lock_rw_rdlock(&env->auth_zones->lock);
4847         z = auth_zone_find(env->auth_zones, xfr->name, xfr->namelen,
4848                 xfr->dclass);
4849         if(!z) {
4850                 lock_rw_unlock(&env->auth_zones->lock);
4851                 /* the zone is gone, ignore xfr results */
4852                 lock_basic_lock(&xfr->lock);
4853                 return;
4854         }
4855         lock_rw_rdlock(&z->lock);
4856         lock_basic_lock(&xfr->lock);
4857         lock_rw_unlock(&env->auth_zones->lock);
4858
4859         if(z->zonefile == NULL || z->zonefile[0] == 0) {
4860                 lock_rw_unlock(&z->lock);
4861                 /* no write needed, no zonefile set */
4862                 return;
4863         }
4864         zfilename = z->zonefile;
4865         if(cfg->chrootdir && cfg->chrootdir[0] && strncmp(zfilename,
4866                 cfg->chrootdir, strlen(cfg->chrootdir)) == 0)
4867                 zfilename += strlen(cfg->chrootdir);
4868
4869         /* write to tempfile first */
4870         if((size_t)strlen(zfilename) + 16 > sizeof(tmpfile)) {
4871                 verbose(VERB_ALGO, "tmpfilename too long, cannot update "
4872                         " zonefile %s", zfilename);
4873                 lock_rw_unlock(&z->lock);
4874                 return;
4875         }
4876         snprintf(tmpfile, sizeof(tmpfile), "%s.tmp%u", zfilename,
4877                 (unsigned)getpid());
4878         if(xfr->task_transfer->master->http) {
4879                 /* use the stored chunk list to write them */
4880                 if(!auth_zone_write_chunks(xfr, tmpfile)) {
4881                         unlink(tmpfile);
4882                         lock_rw_unlock(&z->lock);
4883                 }
4884         } else if(!auth_zone_write_file(z, tmpfile)) {
4885                 unlink(tmpfile);
4886                 lock_rw_unlock(&z->lock);
4887                 return;
4888         }
4889         if(rename(tmpfile, zfilename) < 0) {
4890                 log_err("could not rename(%s, %s): %s", tmpfile, zfilename,
4891                         strerror(errno));
4892                 unlink(tmpfile);
4893                 lock_rw_unlock(&z->lock);
4894                 return;
4895         }
4896         lock_rw_unlock(&z->lock);
4897 }
4898
4899 /** process chunk list and update zone in memory,
4900  * return false if it did not work */
4901 static int
4902 xfr_process_chunk_list(struct auth_xfer* xfr, struct module_env* env,
4903         int* ixfr_fail)
4904 {
4905         struct auth_zone* z;
4906
4907         /* obtain locks and structures */
4908         /* release xfr lock, then, while holding az->lock grab both
4909          * z->lock and xfr->lock */
4910         lock_basic_unlock(&xfr->lock);
4911         lock_rw_rdlock(&env->auth_zones->lock);
4912         z = auth_zone_find(env->auth_zones, xfr->name, xfr->namelen,
4913                 xfr->dclass);
4914         if(!z) {
4915                 lock_rw_unlock(&env->auth_zones->lock);
4916                 /* the zone is gone, ignore xfr results */
4917                 lock_basic_lock(&xfr->lock);
4918                 return 0;
4919         }
4920         lock_rw_wrlock(&z->lock);
4921         lock_basic_lock(&xfr->lock);
4922         lock_rw_unlock(&env->auth_zones->lock);
4923
4924         /* apply data */
4925         if(xfr->task_transfer->master->http) {
4926                 if(!apply_http(xfr, z, env->scratch_buffer)) {
4927                         lock_rw_unlock(&z->lock);
4928                         verbose(VERB_ALGO, "http from %s: could not store data",
4929                                 xfr->task_transfer->master->host);
4930                         return 0;
4931                 }
4932         } else if(xfr->task_transfer->on_ixfr &&
4933                 !xfr->task_transfer->on_ixfr_is_axfr) {
4934                 if(!apply_ixfr(xfr, z, env->scratch_buffer)) {
4935                         lock_rw_unlock(&z->lock);
4936                         verbose(VERB_ALGO, "xfr from %s: could not store IXFR"
4937                                 " data", xfr->task_transfer->master->host);
4938                         *ixfr_fail = 1;
4939                         return 0;
4940                 }
4941         } else {
4942                 if(!apply_axfr(xfr, z, env->scratch_buffer)) {
4943                         lock_rw_unlock(&z->lock);
4944                         verbose(VERB_ALGO, "xfr from %s: could not store AXFR"
4945                                 " data", xfr->task_transfer->master->host);
4946                         return 0;
4947                 }
4948         }
4949         xfr->zone_expired = 0;
4950         z->zone_expired = 0;
4951         if(!xfr_find_soa(z, xfr)) {
4952                 lock_rw_unlock(&z->lock);
4953                 verbose(VERB_ALGO, "xfr from %s: no SOA in zone after update"
4954                         " (or malformed RR)", xfr->task_transfer->master->host);
4955                 return 0;
4956         }
4957         if(xfr->have_zone)
4958                 xfr->lease_time = *env->now;
4959
4960         /* unlock */
4961         lock_rw_unlock(&z->lock);
4962
4963         if(verbosity >= VERB_QUERY && xfr->have_zone) {
4964                 char zname[256];
4965                 dname_str(xfr->name, zname);
4966                 verbose(VERB_QUERY, "auth zone %s updated to serial %u", zname,
4967                         (unsigned)xfr->serial);
4968         }
4969         /* see if we need to write to a zonefile */
4970         xfr_write_after_update(xfr, env);
4971         return 1;
4972 }
4973
4974 /** disown task_transfer.  caller must hold xfr.lock */
4975 static void
4976 xfr_transfer_disown(struct auth_xfer* xfr)
4977 {
4978         /* remove timer (from this worker's event base) */
4979         comm_timer_delete(xfr->task_transfer->timer);
4980         xfr->task_transfer->timer = NULL;
4981         /* remove the commpoint */
4982         comm_point_delete(xfr->task_transfer->cp);
4983         xfr->task_transfer->cp = NULL;
4984         /* we don't own this item anymore */
4985         xfr->task_transfer->worker = NULL;
4986         xfr->task_transfer->env = NULL;
4987 }
4988
4989 /** lookup a host name for its addresses, if needed */
4990 static int
4991 xfr_transfer_lookup_host(struct auth_xfer* xfr, struct module_env* env)
4992 {
4993         struct sockaddr_storage addr;
4994         socklen_t addrlen = 0;
4995         struct auth_master* master = xfr->task_transfer->lookup_target;
4996         struct query_info qinfo;
4997         uint16_t qflags = BIT_RD;
4998         uint8_t dname[LDNS_MAX_DOMAINLEN+1];
4999         struct edns_data edns;
5000         sldns_buffer* buf = env->scratch_buffer;
5001         if(!master) return 0;
5002         if(extstrtoaddr(master->host, &addr, &addrlen)) {
5003                 /* not needed, host is in IP addr format */
5004                 return 0;
5005         }
5006         if(master->allow_notify)
5007                 return 0; /* allow-notifies are not transferred from, no
5008                 lookup is needed */
5009
5010         /* use mesh_new_callback to probe for non-addr hosts,
5011          * and then wait for them to be looked up (in cache, or query) */
5012         qinfo.qname_len = sizeof(dname);
5013         if(sldns_str2wire_dname_buf(master->host, dname, &qinfo.qname_len)
5014                 != 0) {
5015                 log_err("cannot parse host name of master %s", master->host);
5016                 return 0;
5017         }
5018         qinfo.qname = dname;
5019         qinfo.qclass = xfr->dclass;
5020         qinfo.qtype = LDNS_RR_TYPE_A;
5021         if(xfr->task_transfer->lookup_aaaa)
5022                 qinfo.qtype = LDNS_RR_TYPE_AAAA;
5023         qinfo.local_alias = NULL;
5024         if(verbosity >= VERB_ALGO) {
5025                 char buf1[512];
5026                 char buf2[LDNS_MAX_DOMAINLEN+1];
5027                 dname_str(xfr->name, buf2);
5028                 snprintf(buf1, sizeof(buf1), "auth zone %s: master lookup"
5029                         " for task_transfer", buf2);
5030                 log_query_info(VERB_ALGO, buf1, &qinfo);
5031         }
5032         edns.edns_present = 1;
5033         edns.ext_rcode = 0;
5034         edns.edns_version = 0;
5035         edns.bits = EDNS_DO;
5036         edns.opt_list = NULL;
5037         if(sldns_buffer_capacity(buf) < 65535)
5038                 edns.udp_size = (uint16_t)sldns_buffer_capacity(buf);
5039         else    edns.udp_size = 65535;
5040
5041         /* unlock xfr during mesh_new_callback() because the callback can be
5042          * called straight away */
5043         lock_basic_unlock(&xfr->lock);
5044         if(!mesh_new_callback(env->mesh, &qinfo, qflags, &edns, buf, 0,
5045                 &auth_xfer_transfer_lookup_callback, xfr)) {
5046                 lock_basic_lock(&xfr->lock);
5047                 log_err("out of memory lookup up master %s", master->host);
5048                 return 0;
5049         }
5050         lock_basic_lock(&xfr->lock);
5051         return 1;
5052 }
5053
5054 /** initiate TCP to the target and fetch zone.
5055  * returns true if that was successfully started, and timeout setup. */
5056 static int
5057 xfr_transfer_init_fetch(struct auth_xfer* xfr, struct module_env* env)
5058 {
5059         struct sockaddr_storage addr;
5060         socklen_t addrlen = 0;
5061         struct auth_master* master = xfr->task_transfer->master;
5062         char *auth_name = NULL;
5063         struct timeval t;
5064         int timeout;
5065         if(!master) return 0;
5066         if(master->allow_notify) return 0; /* only for notify */
5067
5068         /* get master addr */
5069         if(xfr->task_transfer->scan_addr) {
5070                 addrlen = xfr->task_transfer->scan_addr->addrlen;
5071                 memmove(&addr, &xfr->task_transfer->scan_addr->addr, addrlen);
5072         } else {
5073                 if(!authextstrtoaddr(master->host, &addr, &addrlen, &auth_name)) {
5074                         /* the ones that are not in addr format are supposed
5075                          * to be looked up.  The lookup has failed however,
5076                          * so skip them */
5077                         char zname[255+1];
5078                         dname_str(xfr->name, zname);
5079                         log_err("%s: failed lookup, cannot transfer from master %s",
5080                                 zname, master->host);
5081                         return 0;
5082                 }
5083         }
5084
5085         /* remove previous TCP connection (if any) */
5086         if(xfr->task_transfer->cp) {
5087                 comm_point_delete(xfr->task_transfer->cp);
5088                 xfr->task_transfer->cp = NULL;
5089         }
5090         if(!xfr->task_transfer->timer) {
5091                 xfr->task_transfer->timer = comm_timer_create(env->worker_base,
5092                         auth_xfer_transfer_timer_callback, xfr);
5093                 if(!xfr->task_transfer->timer) {
5094                         log_err("malloc failure");
5095                         return 0;
5096                 }
5097         }
5098         timeout = AUTH_TRANSFER_TIMEOUT;
5099 #ifndef S_SPLINT_S
5100         t.tv_sec = timeout/1000;
5101         t.tv_usec = (timeout%1000)*1000;
5102 #endif
5103
5104         if(master->http) {
5105                 /* perform http fetch */
5106                 /* store http port number into sockaddr,
5107                  * unless someone used unbound's host@port notation */
5108                 xfr->task_transfer->on_ixfr = 0;
5109                 if(strchr(master->host, '@') == NULL)
5110                         sockaddr_store_port(&addr, addrlen, master->port);
5111                 xfr->task_transfer->cp = outnet_comm_point_for_http(
5112                         env->outnet, auth_xfer_transfer_http_callback, xfr,
5113                         &addr, addrlen, -1, master->ssl, master->host,
5114                         master->file);
5115                 if(!xfr->task_transfer->cp) {
5116                         char zname[255+1], as[256];
5117                         dname_str(xfr->name, zname);
5118                         addr_to_str(&addr, addrlen, as, sizeof(as));
5119                         verbose(VERB_ALGO, "cannot create http cp "
5120                                 "connection for %s to %s", zname, as);
5121                         return 0;
5122                 }
5123                 comm_timer_set(xfr->task_transfer->timer, &t);
5124                 if(verbosity >= VERB_ALGO) {
5125                         char zname[255+1], as[256];
5126                         dname_str(xfr->name, zname);
5127                         addr_to_str(&addr, addrlen, as, sizeof(as));
5128                         verbose(VERB_ALGO, "auth zone %s transfer next HTTP fetch from %s started", zname, as);
5129                 }
5130                 return 1;
5131         }
5132
5133         /* perform AXFR/IXFR */
5134         /* set the packet to be written */
5135         /* create new ID */
5136         xfr->task_transfer->id = (uint16_t)(ub_random(env->rnd)&0xffff);
5137         xfr_create_ixfr_packet(xfr, env->scratch_buffer,
5138                 xfr->task_transfer->id, master);
5139
5140         /* connect on fd */
5141         xfr->task_transfer->cp = outnet_comm_point_for_tcp(env->outnet,
5142                 auth_xfer_transfer_tcp_callback, xfr, &addr, addrlen,
5143                 env->scratch_buffer, -1,
5144                 auth_name != NULL, auth_name);
5145         if(!xfr->task_transfer->cp) {
5146                 char zname[255+1], as[256];
5147                 dname_str(xfr->name, zname);
5148                 addr_to_str(&addr, addrlen, as, sizeof(as));
5149                 verbose(VERB_ALGO, "cannot create tcp cp connection for "
5150                         "xfr %s to %s", zname, as);
5151                 return 0;
5152         }
5153         comm_timer_set(xfr->task_transfer->timer, &t);
5154         if(verbosity >= VERB_ALGO) {
5155                 char zname[255+1], as[256];
5156                 dname_str(xfr->name, zname);
5157                 addr_to_str(&addr, addrlen, as, sizeof(as));
5158                 verbose(VERB_ALGO, "auth zone %s transfer next %s fetch from %s started", zname,
5159                         (xfr->task_transfer->on_ixfr?"IXFR":"AXFR"), as);
5160         }
5161         return 1;
5162 }
5163
5164 /** perform next lookup, next transfer TCP, or end and resume wait time task */
5165 static void
5166 xfr_transfer_nexttarget_or_end(struct auth_xfer* xfr, struct module_env* env)
5167 {
5168         log_assert(xfr->task_transfer->worker == env->worker);
5169
5170         /* are we performing lookups? */
5171         while(xfr->task_transfer->lookup_target) {
5172                 if(xfr_transfer_lookup_host(xfr, env)) {
5173                         /* wait for lookup to finish,
5174                          * note that the hostname may be in unbound's cache
5175                          * and we may then get an instant cache response,
5176                          * and that calls the callback just like a full
5177                          * lookup and lookup failures also call callback */
5178                         if(verbosity >= VERB_ALGO) {
5179                                 char zname[255+1];
5180                                 dname_str(xfr->name, zname);
5181                                 verbose(VERB_ALGO, "auth zone %s transfer next target lookup", zname);
5182                         }
5183                         lock_basic_unlock(&xfr->lock);
5184                         return;
5185                 }
5186                 xfr_transfer_move_to_next_lookup(xfr, env);
5187         }
5188
5189         /* initiate TCP and fetch the zone from the master */
5190         /* and set timeout on it */
5191         while(!xfr_transfer_end_of_list(xfr)) {
5192                 xfr->task_transfer->master = xfr_transfer_current_master(xfr);
5193                 if(xfr_transfer_init_fetch(xfr, env)) {
5194                         /* successfully started, wait for callback */
5195                         lock_basic_unlock(&xfr->lock);
5196                         return;
5197                 }
5198                 /* failed to fetch, next master */
5199                 xfr_transfer_nextmaster(xfr);
5200         }
5201         if(verbosity >= VERB_ALGO) {
5202                 char zname[255+1];
5203                 dname_str(xfr->name, zname);
5204                 verbose(VERB_ALGO, "auth zone %s transfer failed, wait", zname);
5205         }
5206
5207         /* we failed to fetch the zone, move to wait task
5208          * use the shorter retry timeout */
5209         xfr_transfer_disown(xfr);
5210
5211         /* pick up the nextprobe task and wait */
5212         if(xfr->task_nextprobe->worker == NULL)
5213                 xfr_set_timeout(xfr, env, 1, 0);
5214         lock_basic_unlock(&xfr->lock);
5215 }
5216
5217 /** add addrs from A or AAAA rrset to the master */
5218 static void
5219 xfr_master_add_addrs(struct auth_master* m, struct ub_packed_rrset_key* rrset,
5220         uint16_t rrtype)
5221 {
5222         size_t i;
5223         struct packed_rrset_data* data;
5224         if(!m || !rrset) return;
5225         if(rrtype != LDNS_RR_TYPE_A && rrtype != LDNS_RR_TYPE_AAAA)
5226                 return;
5227         data = (struct packed_rrset_data*)rrset->entry.data;
5228         for(i=0; i<data->count; i++) {
5229                 struct auth_addr* a;
5230                 size_t len = data->rr_len[i] - 2;
5231                 uint8_t* rdata = data->rr_data[i]+2;
5232                 if(rrtype == LDNS_RR_TYPE_A && len != INET_SIZE)
5233                         continue; /* wrong length for A */
5234                 if(rrtype == LDNS_RR_TYPE_AAAA && len != INET6_SIZE)
5235                         continue; /* wrong length for AAAA */
5236
5237                 /* add and alloc it */
5238                 a = (struct auth_addr*)calloc(1, sizeof(*a));
5239                 if(!a) {
5240                         log_err("out of memory");
5241                         return;
5242                 }
5243                 if(rrtype == LDNS_RR_TYPE_A) {
5244                         struct sockaddr_in* sa;
5245                         a->addrlen = (socklen_t)sizeof(*sa);
5246                         sa = (struct sockaddr_in*)&a->addr;
5247                         sa->sin_family = AF_INET;
5248                         sa->sin_port = (in_port_t)htons(UNBOUND_DNS_PORT);
5249                         memmove(&sa->sin_addr, rdata, INET_SIZE);
5250                 } else {
5251                         struct sockaddr_in6* sa;
5252                         a->addrlen = (socklen_t)sizeof(*sa);
5253                         sa = (struct sockaddr_in6*)&a->addr;
5254                         sa->sin6_family = AF_INET6;
5255                         sa->sin6_port = (in_port_t)htons(UNBOUND_DNS_PORT);
5256                         memmove(&sa->sin6_addr, rdata, INET6_SIZE);
5257                 }
5258                 if(verbosity >= VERB_ALGO) {
5259                         char s[64];
5260                         addr_to_str(&a->addr, a->addrlen, s, sizeof(s));
5261                         verbose(VERB_ALGO, "auth host %s lookup %s",
5262                                 m->host, s);
5263                 }
5264                 /* append to list */
5265                 a->next = m->list;
5266                 m->list = a;
5267         }
5268 }
5269
5270 /** callback for task_transfer lookup of host name, of A or AAAA */
5271 void auth_xfer_transfer_lookup_callback(void* arg, int rcode, sldns_buffer* buf,
5272         enum sec_status ATTR_UNUSED(sec), char* ATTR_UNUSED(why_bogus),
5273         int ATTR_UNUSED(was_ratelimited))
5274 {
5275         struct auth_xfer* xfr = (struct auth_xfer*)arg;
5276         struct module_env* env;
5277         log_assert(xfr->task_transfer);
5278         lock_basic_lock(&xfr->lock);
5279         env = xfr->task_transfer->env;
5280         if(env->outnet->want_to_quit) {
5281                 lock_basic_unlock(&xfr->lock);
5282                 return; /* stop on quit */
5283         }
5284
5285         /* process result */
5286         if(rcode == LDNS_RCODE_NOERROR) {
5287                 uint16_t wanted_qtype = LDNS_RR_TYPE_A;
5288                 struct regional* temp = env->scratch;
5289                 struct query_info rq;
5290                 struct reply_info* rep;
5291                 if(xfr->task_transfer->lookup_aaaa)
5292                         wanted_qtype = LDNS_RR_TYPE_AAAA;
5293                 memset(&rq, 0, sizeof(rq));
5294                 rep = parse_reply_in_temp_region(buf, temp, &rq);
5295                 if(rep && rq.qtype == wanted_qtype &&
5296                         FLAGS_GET_RCODE(rep->flags) == LDNS_RCODE_NOERROR) {
5297                         /* parsed successfully */
5298                         struct ub_packed_rrset_key* answer =
5299                                 reply_find_answer_rrset(&rq, rep);
5300                         if(answer) {
5301                                 xfr_master_add_addrs(xfr->task_transfer->
5302                                         lookup_target, answer, wanted_qtype);
5303                         } else {
5304                                 if(verbosity >= VERB_ALGO) {
5305                                         char zname[255+1];
5306                                         dname_str(xfr->name, zname);
5307                                         verbose(VERB_ALGO, "auth zone %s host %s type %s transfer lookup has nodata", zname, xfr->task_transfer->lookup_target->host, (xfr->task_transfer->lookup_aaaa?"AAAA":"A"));
5308                                 }
5309                         }
5310                 } else {
5311                         if(verbosity >= VERB_ALGO) {
5312                                 char zname[255+1];
5313                                 dname_str(xfr->name, zname);
5314                                 verbose(VERB_ALGO, "auth zone %s host %s type %s transfer lookup has no answer", zname, xfr->task_transfer->lookup_target->host, (xfr->task_transfer->lookup_aaaa?"AAAA":"A"));
5315                         }
5316                 }
5317         } else {
5318                 if(verbosity >= VERB_ALGO) {
5319                         char zname[255+1];
5320                         dname_str(xfr->name, zname);
5321                         verbose(VERB_ALGO, "auth zone %s host %s type %s transfer lookup failed", zname, xfr->task_transfer->lookup_target->host, (xfr->task_transfer->lookup_aaaa?"AAAA":"A"));
5322                 }
5323         }
5324         if(xfr->task_transfer->lookup_target->list &&
5325                 xfr->task_transfer->lookup_target == xfr_transfer_current_master(xfr))
5326                 xfr->task_transfer->scan_addr = xfr->task_transfer->lookup_target->list;
5327
5328         /* move to lookup AAAA after A lookup, move to next hostname lookup,
5329          * or move to fetch the zone, or, if nothing to do, end task_transfer */
5330         xfr_transfer_move_to_next_lookup(xfr, env);
5331         xfr_transfer_nexttarget_or_end(xfr, env);
5332 }
5333
5334 /** check if xfer (AXFR or IXFR) packet is OK.
5335  * return false if we lost connection (SERVFAIL, or unreadable).
5336  * return false if we need to move from IXFR to AXFR, with gonextonfail
5337  *      set to false, so the same master is tried again, but with AXFR.
5338  * return true if fine to link into data.
5339  * return true with transferdone=true when the transfer has ended.
5340  */
5341 static int
5342 check_xfer_packet(sldns_buffer* pkt, struct auth_xfer* xfr,
5343         int* gonextonfail, int* transferdone)
5344 {
5345         uint8_t* wire = sldns_buffer_begin(pkt);
5346         int i;
5347         if(sldns_buffer_limit(pkt) < LDNS_HEADER_SIZE) {
5348                 verbose(VERB_ALGO, "xfr to %s failed, packet too small",
5349                         xfr->task_transfer->master->host);
5350                 return 0;
5351         }
5352         if(!LDNS_QR_WIRE(wire)) {
5353                 verbose(VERB_ALGO, "xfr to %s failed, packet has no QR flag",
5354                         xfr->task_transfer->master->host);
5355                 return 0;
5356         }
5357         if(LDNS_TC_WIRE(wire)) {
5358                 verbose(VERB_ALGO, "xfr to %s failed, packet has TC flag",
5359                         xfr->task_transfer->master->host);
5360                 return 0;
5361         }
5362         /* check ID */
5363         if(LDNS_ID_WIRE(wire) != xfr->task_transfer->id) {
5364                 verbose(VERB_ALGO, "xfr to %s failed, packet wrong ID",
5365                         xfr->task_transfer->master->host);
5366                 return 0;
5367         }
5368         if(LDNS_RCODE_WIRE(wire) != LDNS_RCODE_NOERROR) {
5369                 char rcode[32];
5370                 sldns_wire2str_rcode_buf((int)LDNS_RCODE_WIRE(wire), rcode,
5371                         sizeof(rcode));
5372                 /* if we are doing IXFR, check for fallback */
5373                 if(xfr->task_transfer->on_ixfr) {
5374                         if(LDNS_RCODE_WIRE(wire) == LDNS_RCODE_NOTIMPL ||
5375                                 LDNS_RCODE_WIRE(wire) == LDNS_RCODE_SERVFAIL ||
5376                                 LDNS_RCODE_WIRE(wire) == LDNS_RCODE_REFUSED ||
5377                                 LDNS_RCODE_WIRE(wire) == LDNS_RCODE_FORMERR) {
5378                                 verbose(VERB_ALGO, "xfr to %s, fallback "
5379                                         "from IXFR to AXFR (with rcode %s)",
5380                                         xfr->task_transfer->master->host,
5381                                         rcode);
5382                                 xfr->task_transfer->ixfr_fail = 1;
5383                                 *gonextonfail = 0;
5384                                 return 0;
5385                         }
5386                 }
5387                 verbose(VERB_ALGO, "xfr to %s failed, packet with rcode %s",
5388                         xfr->task_transfer->master->host, rcode);
5389                 return 0;
5390         }
5391         if(LDNS_OPCODE_WIRE(wire) != LDNS_PACKET_QUERY) {
5392                 verbose(VERB_ALGO, "xfr to %s failed, packet with bad opcode",
5393                         xfr->task_transfer->master->host);
5394                 return 0;
5395         }
5396         if(LDNS_QDCOUNT(wire) > 1) {
5397                 verbose(VERB_ALGO, "xfr to %s failed, packet has qdcount %d",
5398                         xfr->task_transfer->master->host,
5399                         (int)LDNS_QDCOUNT(wire));
5400                 return 0;
5401         }
5402
5403         /* check qname */
5404         sldns_buffer_set_position(pkt, LDNS_HEADER_SIZE);
5405         for(i=0; i<(int)LDNS_QDCOUNT(wire); i++) {
5406                 size_t pos = sldns_buffer_position(pkt);
5407                 uint16_t qtype, qclass;
5408                 if(pkt_dname_len(pkt) == 0) {
5409                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5410                                 "malformed dname",
5411                                 xfr->task_transfer->master->host);
5412                         return 0;
5413                 }
5414                 if(dname_pkt_compare(pkt, sldns_buffer_at(pkt, pos),
5415                         xfr->name) != 0) {
5416                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5417                                 "wrong qname",
5418                                 xfr->task_transfer->master->host);
5419                         return 0;
5420                 }
5421                 if(sldns_buffer_remaining(pkt) < 4) {
5422                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5423                                 "truncated query RR",
5424                                 xfr->task_transfer->master->host);
5425                         return 0;
5426                 }
5427                 qtype = sldns_buffer_read_u16(pkt);
5428                 qclass = sldns_buffer_read_u16(pkt);
5429                 if(qclass != xfr->dclass) {
5430                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5431                                 "wrong qclass",
5432                                 xfr->task_transfer->master->host);
5433                         return 0;
5434                 }
5435                 if(xfr->task_transfer->on_ixfr) {
5436                         if(qtype != LDNS_RR_TYPE_IXFR) {
5437                                 verbose(VERB_ALGO, "xfr to %s failed, packet "
5438                                         "with wrong qtype, expected IXFR",
5439                                 xfr->task_transfer->master->host);
5440                                 return 0;
5441                         }
5442                 } else {
5443                         if(qtype != LDNS_RR_TYPE_AXFR) {
5444                                 verbose(VERB_ALGO, "xfr to %s failed, packet "
5445                                         "with wrong qtype, expected AXFR",
5446                                 xfr->task_transfer->master->host);
5447                                 return 0;
5448                         }
5449                 }
5450         }
5451
5452         /* check parse of RRs in packet, store first SOA serial
5453          * to be able to detect last SOA (with that serial) to see if done */
5454         /* also check for IXFR 'zone up to date' reply */
5455         for(i=0; i<(int)LDNS_ANCOUNT(wire); i++) {
5456                 size_t pos = sldns_buffer_position(pkt);
5457                 uint16_t tp, rdlen;
5458                 if(pkt_dname_len(pkt) == 0) {
5459                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5460                                 "malformed dname in answer section",
5461                                 xfr->task_transfer->master->host);
5462                         return 0;
5463                 }
5464                 if(sldns_buffer_remaining(pkt) < 10) {
5465                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5466                                 "truncated RR",
5467                                 xfr->task_transfer->master->host);
5468                         return 0;
5469                 }
5470                 tp = sldns_buffer_read_u16(pkt);
5471                 (void)sldns_buffer_read_u16(pkt); /* class */
5472                 (void)sldns_buffer_read_u32(pkt); /* ttl */
5473                 rdlen = sldns_buffer_read_u16(pkt);
5474                 if(sldns_buffer_remaining(pkt) < rdlen) {
5475                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5476                                 "truncated RR rdata",
5477                                 xfr->task_transfer->master->host);
5478                         return 0;
5479                 }
5480
5481                 /* RR parses (haven't checked rdata itself), now look at
5482                  * SOA records to see serial number */
5483                 if(xfr->task_transfer->rr_scan_num == 0 &&
5484                         tp != LDNS_RR_TYPE_SOA) {
5485                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5486                                 "malformed zone transfer, no start SOA",
5487                                 xfr->task_transfer->master->host);
5488                         return 0;
5489                 }
5490                 if(xfr->task_transfer->rr_scan_num == 1 &&
5491                         tp != LDNS_RR_TYPE_SOA) {
5492                         /* second RR is not a SOA record, this is not an IXFR
5493                          * the master is replying with an AXFR */
5494                         xfr->task_transfer->on_ixfr_is_axfr = 1;
5495                 }
5496                 if(tp == LDNS_RR_TYPE_SOA) {
5497                         uint32_t serial;
5498                         if(rdlen < 22) {
5499                                 verbose(VERB_ALGO, "xfr to %s failed, packet "
5500                                         "with SOA with malformed rdata",
5501                                         xfr->task_transfer->master->host);
5502                                 return 0;
5503                         }
5504                         if(dname_pkt_compare(pkt, sldns_buffer_at(pkt, pos),
5505                                 xfr->name) != 0) {
5506                                 verbose(VERB_ALGO, "xfr to %s failed, packet "
5507                                         "with SOA with wrong dname",
5508                                         xfr->task_transfer->master->host);
5509                                 return 0;
5510                         }
5511
5512                         /* read serial number of SOA */
5513                         serial = sldns_buffer_read_u32_at(pkt,
5514                                 sldns_buffer_position(pkt)+rdlen-20);
5515
5516                         /* check for IXFR 'zone has SOA x' reply */
5517                         if(xfr->task_transfer->on_ixfr &&
5518                                 xfr->task_transfer->rr_scan_num == 0 &&
5519                                 LDNS_ANCOUNT(wire)==1) {
5520                                 verbose(VERB_ALGO, "xfr to %s ended, "
5521                                         "IXFR reply that zone has serial %u",
5522                                         xfr->task_transfer->master->host,
5523                                         (unsigned)serial);
5524                                 return 0;
5525                         }
5526
5527                         /* if first SOA, store serial number */
5528                         if(xfr->task_transfer->got_xfr_serial == 0) {
5529                                 xfr->task_transfer->got_xfr_serial = 1;
5530                                 xfr->task_transfer->incoming_xfr_serial =
5531                                         serial;
5532                                 verbose(VERB_ALGO, "xfr %s: contains "
5533                                         "SOA serial %u",
5534                                         xfr->task_transfer->master->host,
5535                                         (unsigned)serial);
5536                         /* see if end of AXFR */
5537                         } else if(!xfr->task_transfer->on_ixfr ||
5538                                 xfr->task_transfer->on_ixfr_is_axfr) {
5539                                 /* second SOA with serial is the end
5540                                  * for AXFR */
5541                                 *transferdone = 1;
5542                                 verbose(VERB_ALGO, "xfr %s: last AXFR packet",
5543                                         xfr->task_transfer->master->host);
5544                         /* for IXFR, count SOA records with that serial */
5545                         } else if(xfr->task_transfer->incoming_xfr_serial ==
5546                                 serial && xfr->task_transfer->got_xfr_serial
5547                                 == 1) {
5548                                 xfr->task_transfer->got_xfr_serial++;
5549                         /* if not first soa, if serial==firstserial, the
5550                          * third time we are at the end, for IXFR */
5551                         } else if(xfr->task_transfer->incoming_xfr_serial ==
5552                                 serial && xfr->task_transfer->got_xfr_serial
5553                                 == 2) {
5554                                 verbose(VERB_ALGO, "xfr %s: last IXFR packet",
5555                                         xfr->task_transfer->master->host);
5556                                 *transferdone = 1;
5557                                 /* continue parse check, if that succeeds,
5558                                  * transfer is done */
5559                         }
5560                 }
5561                 xfr->task_transfer->rr_scan_num++;
5562
5563                 /* skip over RR rdata to go to the next RR */
5564                 sldns_buffer_skip(pkt, (ssize_t)rdlen);
5565         }
5566
5567         /* check authority section */
5568         /* we skip over the RRs checking packet format */
5569         for(i=0; i<(int)LDNS_NSCOUNT(wire); i++) {
5570                 uint16_t rdlen;
5571                 if(pkt_dname_len(pkt) == 0) {
5572                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5573                                 "malformed dname in authority section",
5574                                 xfr->task_transfer->master->host);
5575                         return 0;
5576                 }
5577                 if(sldns_buffer_remaining(pkt) < 10) {
5578                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5579                                 "truncated RR",
5580                                 xfr->task_transfer->master->host);
5581                         return 0;
5582                 }
5583                 (void)sldns_buffer_read_u16(pkt); /* type */
5584                 (void)sldns_buffer_read_u16(pkt); /* class */
5585                 (void)sldns_buffer_read_u32(pkt); /* ttl */
5586                 rdlen = sldns_buffer_read_u16(pkt);
5587                 if(sldns_buffer_remaining(pkt) < rdlen) {
5588                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5589                                 "truncated RR rdata",
5590                                 xfr->task_transfer->master->host);
5591                         return 0;
5592                 }
5593                 /* skip over RR rdata to go to the next RR */
5594                 sldns_buffer_skip(pkt, (ssize_t)rdlen);
5595         }
5596
5597         /* check additional section */
5598         for(i=0; i<(int)LDNS_ARCOUNT(wire); i++) {
5599                 uint16_t rdlen;
5600                 if(pkt_dname_len(pkt) == 0) {
5601                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5602                                 "malformed dname in additional section",
5603                                 xfr->task_transfer->master->host);
5604                         return 0;
5605                 }
5606                 if(sldns_buffer_remaining(pkt) < 10) {
5607                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5608                                 "truncated RR",
5609                                 xfr->task_transfer->master->host);
5610                         return 0;
5611                 }
5612                 (void)sldns_buffer_read_u16(pkt); /* type */
5613                 (void)sldns_buffer_read_u16(pkt); /* class */
5614                 (void)sldns_buffer_read_u32(pkt); /* ttl */
5615                 rdlen = sldns_buffer_read_u16(pkt);
5616                 if(sldns_buffer_remaining(pkt) < rdlen) {
5617                         verbose(VERB_ALGO, "xfr to %s failed, packet with "
5618                                 "truncated RR rdata",
5619                                 xfr->task_transfer->master->host);
5620                         return 0;
5621                 }
5622                 /* skip over RR rdata to go to the next RR */
5623                 sldns_buffer_skip(pkt, (ssize_t)rdlen);
5624         }
5625
5626         return 1;
5627 }
5628
5629 /** Link the data from this packet into the worklist of transferred data */
5630 static int
5631 xfer_link_data(sldns_buffer* pkt, struct auth_xfer* xfr)
5632 {
5633         /* alloc it */
5634         struct auth_chunk* e;
5635         e = (struct auth_chunk*)calloc(1, sizeof(*e));
5636         if(!e) return 0;
5637         e->next = NULL;
5638         e->len = sldns_buffer_limit(pkt);
5639         e->data = memdup(sldns_buffer_begin(pkt), e->len);
5640         if(!e->data) {
5641                 free(e);
5642                 return 0;
5643         }
5644
5645         /* alloc succeeded, link into list */
5646         if(!xfr->task_transfer->chunks_first)
5647                 xfr->task_transfer->chunks_first = e;
5648         if(xfr->task_transfer->chunks_last)
5649                 xfr->task_transfer->chunks_last->next = e;
5650         xfr->task_transfer->chunks_last = e;
5651         return 1;
5652 }
5653
5654 /** task transfer.  the list of data is complete. process it and if failed
5655  * move to next master, if succeeded, end the task transfer */
5656 static void
5657 process_list_end_transfer(struct auth_xfer* xfr, struct module_env* env)
5658 {
5659         int ixfr_fail = 0;
5660         if(xfr_process_chunk_list(xfr, env, &ixfr_fail)) {
5661                 /* it worked! */
5662                 auth_chunks_delete(xfr->task_transfer);
5663
5664                 /* we fetched the zone, move to wait task */
5665                 xfr_transfer_disown(xfr);
5666
5667                 if(xfr->notify_received && (!xfr->notify_has_serial ||
5668                         (xfr->notify_has_serial &&
5669                         xfr_serial_means_update(xfr, xfr->notify_serial)))) {
5670                         uint32_t sr = xfr->notify_serial;
5671                         int has_sr = xfr->notify_has_serial;
5672                         /* we received a notify while probe/transfer was
5673                          * in progress.  start a new probe and transfer */
5674                         xfr->notify_received = 0;
5675                         xfr->notify_has_serial = 0;
5676                         xfr->notify_serial = 0;
5677                         if(!xfr_start_probe(xfr, env, NULL)) {
5678                                 /* if we couldn't start it, already in
5679                                  * progress; restore notify serial,
5680                                  * while xfr still locked */
5681                                 xfr->notify_received = 1;
5682                                 xfr->notify_has_serial = has_sr;
5683                                 xfr->notify_serial = sr;
5684                                 lock_basic_unlock(&xfr->lock);
5685                         }
5686                         return;
5687                 } else {
5688                         /* pick up the nextprobe task and wait (normail wait time) */
5689                         if(xfr->task_nextprobe->worker == NULL)
5690                                 xfr_set_timeout(xfr, env, 0, 0);
5691                 }
5692                 lock_basic_unlock(&xfr->lock);
5693                 return;
5694         }
5695         /* processing failed */
5696         /* when done, delete data from list */
5697         auth_chunks_delete(xfr->task_transfer);
5698         if(ixfr_fail) {
5699                 xfr->task_transfer->ixfr_fail = 1;
5700         } else {
5701                 xfr_transfer_nextmaster(xfr);
5702         }
5703         xfr_transfer_nexttarget_or_end(xfr, env);
5704 }
5705
5706 /** callback for the task_transfer timer */
5707 void
5708 auth_xfer_transfer_timer_callback(void* arg)
5709 {
5710         struct auth_xfer* xfr = (struct auth_xfer*)arg;
5711         struct module_env* env;
5712         int gonextonfail = 1;
5713         log_assert(xfr->task_transfer);
5714         lock_basic_lock(&xfr->lock);
5715         env = xfr->task_transfer->env;
5716         if(env->outnet->want_to_quit) {
5717                 lock_basic_unlock(&xfr->lock);
5718                 return; /* stop on quit */
5719         }
5720
5721         verbose(VERB_ALGO, "xfr stopped, connection timeout to %s",
5722                 xfr->task_transfer->master->host);
5723
5724         /* see if IXFR caused the failure, if so, try AXFR */
5725         if(xfr->task_transfer->on_ixfr) {
5726                 xfr->task_transfer->ixfr_possible_timeout_count++;
5727                 if(xfr->task_transfer->ixfr_possible_timeout_count >=
5728                         NUM_TIMEOUTS_FALLBACK_IXFR) {
5729                         verbose(VERB_ALGO, "xfr to %s, fallback "
5730                                 "from IXFR to AXFR (because of timeouts)",
5731                                 xfr->task_transfer->master->host);
5732                         xfr->task_transfer->ixfr_fail = 1;
5733                         gonextonfail = 0;
5734                 }
5735         }
5736
5737         /* delete transferred data from list */
5738         auth_chunks_delete(xfr->task_transfer);
5739         comm_point_delete(xfr->task_transfer->cp);
5740         xfr->task_transfer->cp = NULL;
5741         if(gonextonfail)
5742                 xfr_transfer_nextmaster(xfr);
5743         xfr_transfer_nexttarget_or_end(xfr, env);
5744 }
5745
5746 /** callback for task_transfer tcp connections */
5747 int
5748 auth_xfer_transfer_tcp_callback(struct comm_point* c, void* arg, int err,
5749         struct comm_reply* ATTR_UNUSED(repinfo))
5750 {
5751         struct auth_xfer* xfr = (struct auth_xfer*)arg;
5752         struct module_env* env;
5753         int gonextonfail = 1;
5754         int transferdone = 0;
5755         log_assert(xfr->task_transfer);
5756         lock_basic_lock(&xfr->lock);
5757         env = xfr->task_transfer->env;
5758         if(env->outnet->want_to_quit) {
5759                 lock_basic_unlock(&xfr->lock);
5760                 return 0; /* stop on quit */
5761         }
5762         /* stop the timer */
5763         comm_timer_disable(xfr->task_transfer->timer);
5764
5765         if(err != NETEVENT_NOERROR) {
5766                 /* connection failed, closed, or timeout */
5767                 /* stop this transfer, cleanup
5768                  * and continue task_transfer*/
5769                 verbose(VERB_ALGO, "xfr stopped, connection lost to %s",
5770                         xfr->task_transfer->master->host);
5771
5772                 /* see if IXFR caused the failure, if so, try AXFR */
5773                 if(xfr->task_transfer->on_ixfr) {
5774                         xfr->task_transfer->ixfr_possible_timeout_count++;
5775                         if(xfr->task_transfer->ixfr_possible_timeout_count >=
5776                                 NUM_TIMEOUTS_FALLBACK_IXFR) {
5777                                 verbose(VERB_ALGO, "xfr to %s, fallback "
5778                                         "from IXFR to AXFR (because of timeouts)",
5779                                         xfr->task_transfer->master->host);
5780                                 xfr->task_transfer->ixfr_fail = 1;
5781                                 gonextonfail = 0;
5782                         }
5783                 }
5784
5785         failed:
5786                 /* delete transferred data from list */
5787                 auth_chunks_delete(xfr->task_transfer);
5788                 comm_point_delete(xfr->task_transfer->cp);
5789                 xfr->task_transfer->cp = NULL;
5790                 if(gonextonfail)
5791                         xfr_transfer_nextmaster(xfr);
5792                 xfr_transfer_nexttarget_or_end(xfr, env);
5793                 return 0;
5794         }
5795         /* note that IXFR worked without timeout */
5796         if(xfr->task_transfer->on_ixfr)
5797                 xfr->task_transfer->ixfr_possible_timeout_count = 0;
5798
5799         /* handle returned packet */
5800         /* if it fails, cleanup and end this transfer */
5801         /* if it needs to fallback from IXFR to AXFR, do that */
5802         if(!check_xfer_packet(c->buffer, xfr, &gonextonfail, &transferdone)) {
5803                 goto failed;
5804         }
5805         /* if it is good, link it into the list of data */
5806         /* if the link into list of data fails (malloc fail) cleanup and end */
5807         if(!xfer_link_data(c->buffer, xfr)) {
5808                 verbose(VERB_ALGO, "xfr stopped to %s, malloc failed",
5809                         xfr->task_transfer->master->host);
5810                 goto failed;
5811         }
5812         /* if the transfer is done now, disconnect and process the list */
5813         if(transferdone) {
5814                 comm_point_delete(xfr->task_transfer->cp);
5815                 xfr->task_transfer->cp = NULL;
5816                 process_list_end_transfer(xfr, env);
5817                 return 0;
5818         }
5819
5820         /* if we want to read more messages, setup the commpoint to read
5821          * a DNS packet, and the timeout */
5822         lock_basic_unlock(&xfr->lock);
5823         c->tcp_is_reading = 1;
5824         sldns_buffer_clear(c->buffer);
5825         comm_point_start_listening(c, -1, AUTH_TRANSFER_TIMEOUT);
5826         return 0;
5827 }
5828
5829 /** callback for task_transfer http connections */
5830 int
5831 auth_xfer_transfer_http_callback(struct comm_point* c, void* arg, int err,
5832         struct comm_reply* repinfo)
5833 {
5834         struct auth_xfer* xfr = (struct auth_xfer*)arg;
5835         struct module_env* env;
5836         log_assert(xfr->task_transfer);
5837         lock_basic_lock(&xfr->lock);
5838         env = xfr->task_transfer->env;
5839         if(env->outnet->want_to_quit) {
5840                 lock_basic_unlock(&xfr->lock);
5841                 return 0; /* stop on quit */
5842         }
5843         verbose(VERB_ALGO, "auth zone transfer http callback");
5844         /* stop the timer */
5845         comm_timer_disable(xfr->task_transfer->timer);
5846
5847         if(err != NETEVENT_NOERROR && err != NETEVENT_DONE) {
5848                 /* connection failed, closed, or timeout */
5849                 /* stop this transfer, cleanup
5850                  * and continue task_transfer*/
5851                 verbose(VERB_ALGO, "http stopped, connection lost to %s",
5852                         xfr->task_transfer->master->host);
5853         failed:
5854                 /* delete transferred data from list */
5855                 auth_chunks_delete(xfr->task_transfer);
5856                 if(repinfo) repinfo->c = NULL; /* signal cp deleted to
5857                                 the routine calling this callback */
5858                 comm_point_delete(xfr->task_transfer->cp);
5859                 xfr->task_transfer->cp = NULL;
5860                 xfr_transfer_nextmaster(xfr);
5861                 xfr_transfer_nexttarget_or_end(xfr, env);
5862                 return 0;
5863         }
5864
5865         /* if it is good, link it into the list of data */
5866         /* if the link into list of data fails (malloc fail) cleanup and end */
5867         if(sldns_buffer_limit(c->buffer) > 0) {
5868                 verbose(VERB_ALGO, "auth zone http queued up %d bytes",
5869                         (int)sldns_buffer_limit(c->buffer));
5870                 if(!xfer_link_data(c->buffer, xfr)) {
5871                         verbose(VERB_ALGO, "http stopped to %s, malloc failed",
5872                                 xfr->task_transfer->master->host);
5873                         goto failed;
5874                 }
5875         }
5876         /* if the transfer is done now, disconnect and process the list */
5877         if(err == NETEVENT_DONE) {
5878                 if(repinfo) repinfo->c = NULL; /* signal cp deleted to
5879                                 the routine calling this callback */
5880                 comm_point_delete(xfr->task_transfer->cp);
5881                 xfr->task_transfer->cp = NULL;
5882                 process_list_end_transfer(xfr, env);
5883                 return 0;
5884         }
5885
5886         /* if we want to read more messages, setup the commpoint to read
5887          * a DNS packet, and the timeout */
5888         lock_basic_unlock(&xfr->lock);
5889         c->tcp_is_reading = 1;
5890         sldns_buffer_clear(c->buffer);
5891         comm_point_start_listening(c, -1, AUTH_TRANSFER_TIMEOUT);
5892         return 0;
5893 }
5894
5895
5896 /** start transfer task by this worker , xfr is locked. */
5897 static void
5898 xfr_start_transfer(struct auth_xfer* xfr, struct module_env* env,
5899         struct auth_master* master)
5900 {
5901         log_assert(xfr->task_transfer != NULL);
5902         log_assert(xfr->task_transfer->worker == NULL);
5903         log_assert(xfr->task_transfer->chunks_first == NULL);
5904         log_assert(xfr->task_transfer->chunks_last == NULL);
5905         xfr->task_transfer->worker = env->worker;
5906         xfr->task_transfer->env = env;
5907
5908         /* init transfer process */
5909         /* find that master in the transfer's list of masters? */
5910         xfr_transfer_start_list(xfr, master);
5911         /* start lookup for hostnames in transfer master list */
5912         xfr_transfer_start_lookups(xfr);
5913
5914         /* initiate TCP, and set timeout on it */
5915         xfr_transfer_nexttarget_or_end(xfr, env);
5916 }
5917
5918 /** disown task_probe.  caller must hold xfr.lock */
5919 static void
5920 xfr_probe_disown(struct auth_xfer* xfr)
5921 {
5922         /* remove timer (from this worker's event base) */
5923         comm_timer_delete(xfr->task_probe->timer);
5924         xfr->task_probe->timer = NULL;
5925         /* remove the commpoint */
5926         comm_point_delete(xfr->task_probe->cp);
5927         xfr->task_probe->cp = NULL;
5928         /* we don't own this item anymore */
5929         xfr->task_probe->worker = NULL;
5930         xfr->task_probe->env = NULL;
5931 }
5932
5933 /** send the UDP probe to the master, this is part of task_probe */
5934 static int
5935 xfr_probe_send_probe(struct auth_xfer* xfr, struct module_env* env,
5936         int timeout)
5937 {
5938         struct sockaddr_storage addr;
5939         socklen_t addrlen = 0;
5940         struct timeval t;
5941         /* pick master */
5942         struct auth_master* master = xfr_probe_current_master(xfr);
5943         char *auth_name = NULL;
5944         if(!master) return 0;
5945         if(master->allow_notify) return 0; /* only for notify */
5946         if(master->http) return 0; /* only masters get SOA UDP probe,
5947                 not urls, if those are in this list */
5948
5949         /* get master addr */
5950         if(xfr->task_probe->scan_addr) {
5951                 addrlen = xfr->task_probe->scan_addr->addrlen;
5952                 memmove(&addr, &xfr->task_probe->scan_addr->addr, addrlen);
5953         } else {
5954                 if(!authextstrtoaddr(master->host, &addr, &addrlen, &auth_name)) {
5955                         /* the ones that are not in addr format are supposed
5956                          * to be looked up.  The lookup has failed however,
5957                          * so skip them */
5958                         char zname[255+1];
5959                         dname_str(xfr->name, zname);
5960                         log_err("%s: failed lookup, cannot probe to master %s",
5961                                 zname, master->host);
5962                         return 0;
5963                 }
5964                 if (auth_name != NULL) {
5965                         if (addr.ss_family == AF_INET
5966                         &&  ntohs(((struct sockaddr_in *)&addr)->sin_port)
5967                             == env->cfg->ssl_port)
5968                                 ((struct sockaddr_in *)&addr)->sin_port
5969                                         = htons(env->cfg->port);
5970                         else if (addr.ss_family == AF_INET6
5971                         &&  ntohs(((struct sockaddr_in6 *)&addr)->sin6_port)
5972                             == env->cfg->ssl_port)
5973                                 ((struct sockaddr_in6 *)&addr)->sin6_port
5974                                         = htons(env->cfg->port);
5975                 }
5976         }
5977
5978         /* create packet */
5979         /* create new ID for new probes, but not on timeout retries,
5980          * this means we'll accept replies to previous retries to same ip */
5981         if(timeout == AUTH_PROBE_TIMEOUT)
5982                 xfr->task_probe->id = (uint16_t)(ub_random(env->rnd)&0xffff);
5983         xfr_create_soa_probe_packet(xfr, env->scratch_buffer,
5984                 xfr->task_probe->id);
5985         /* we need to remove the cp if we have a different ip4/ip6 type now */
5986         if(xfr->task_probe->cp &&
5987                 ((xfr->task_probe->cp_is_ip6 && !addr_is_ip6(&addr, addrlen)) ||
5988                 (!xfr->task_probe->cp_is_ip6 && addr_is_ip6(&addr, addrlen)))
5989                 ) {
5990                 comm_point_delete(xfr->task_probe->cp);
5991                 xfr->task_probe->cp = NULL;
5992         }
5993         if(!xfr->task_probe->cp) {
5994                 if(addr_is_ip6(&addr, addrlen))
5995                         xfr->task_probe->cp_is_ip6 = 1;
5996                 else    xfr->task_probe->cp_is_ip6 = 0;
5997                 xfr->task_probe->cp = outnet_comm_point_for_udp(env->outnet,
5998                         auth_xfer_probe_udp_callback, xfr, &addr, addrlen);
5999                 if(!xfr->task_probe->cp) {
6000                         char zname[255+1], as[256];
6001                         dname_str(xfr->name, zname);
6002                         addr_to_str(&addr, addrlen, as, sizeof(as));
6003                         verbose(VERB_ALGO, "cannot create udp cp for "
6004                                 "probe %s to %s", zname, as);
6005                         return 0;
6006                 }
6007         }
6008         if(!xfr->task_probe->timer) {
6009                 xfr->task_probe->timer = comm_timer_create(env->worker_base,
6010                         auth_xfer_probe_timer_callback, xfr);
6011                 if(!xfr->task_probe->timer) {
6012                         log_err("malloc failure");
6013                         return 0;
6014                 }
6015         }
6016
6017         /* send udp packet */
6018         if(!comm_point_send_udp_msg(xfr->task_probe->cp, env->scratch_buffer,
6019                 (struct sockaddr*)&addr, addrlen)) {
6020                 char zname[255+1], as[256];
6021                 dname_str(xfr->name, zname);
6022                 addr_to_str(&addr, addrlen, as, sizeof(as));
6023                 verbose(VERB_ALGO, "failed to send soa probe for %s to %s",
6024                         zname, as);
6025                 return 0;
6026         }
6027         if(verbosity >= VERB_ALGO) {
6028                 char zname[255+1], as[256];
6029                 dname_str(xfr->name, zname);
6030                 addr_to_str(&addr, addrlen, as, sizeof(as));
6031                 verbose(VERB_ALGO, "auth zone %s soa probe sent to %s", zname,
6032                         as);
6033         }
6034         xfr->task_probe->timeout = timeout;
6035 #ifndef S_SPLINT_S
6036         t.tv_sec = timeout/1000;
6037         t.tv_usec = (timeout%1000)*1000;
6038 #endif
6039         comm_timer_set(xfr->task_probe->timer, &t);
6040
6041         return 1;
6042 }
6043
6044 /** callback for task_probe timer */
6045 void
6046 auth_xfer_probe_timer_callback(void* arg)
6047 {
6048         struct auth_xfer* xfr = (struct auth_xfer*)arg;
6049         struct module_env* env;
6050         log_assert(xfr->task_probe);
6051         lock_basic_lock(&xfr->lock);
6052         env = xfr->task_probe->env;
6053         if(env->outnet->want_to_quit) {
6054                 lock_basic_unlock(&xfr->lock);
6055                 return; /* stop on quit */
6056         }
6057
6058         if(verbosity >= VERB_ALGO) {
6059                 char zname[255+1];
6060                 dname_str(xfr->name, zname);
6061                 verbose(VERB_ALGO, "auth zone %s soa probe timeout", zname);
6062         }
6063         if(xfr->task_probe->timeout <= AUTH_PROBE_TIMEOUT_STOP) {
6064                 /* try again with bigger timeout */
6065                 if(xfr_probe_send_probe(xfr, env, xfr->task_probe->timeout*2)) {
6066                         lock_basic_unlock(&xfr->lock);
6067                         return;
6068                 }
6069         }
6070         /* delete commpoint so a new one is created, with a fresh port nr */
6071         comm_point_delete(xfr->task_probe->cp);
6072         xfr->task_probe->cp = NULL;
6073
6074         /* too many timeouts (or fail to send), move to next or end */
6075         xfr_probe_nextmaster(xfr);
6076         xfr_probe_send_or_end(xfr, env);
6077 }
6078
6079 /** callback for task_probe udp packets */
6080 int
6081 auth_xfer_probe_udp_callback(struct comm_point* c, void* arg, int err,
6082         struct comm_reply* repinfo)
6083 {
6084         struct auth_xfer* xfr = (struct auth_xfer*)arg;
6085         struct module_env* env;
6086         log_assert(xfr->task_probe);
6087         lock_basic_lock(&xfr->lock);
6088         env = xfr->task_probe->env;
6089         if(env->outnet->want_to_quit) {
6090                 lock_basic_unlock(&xfr->lock);
6091                 return 0; /* stop on quit */
6092         }
6093
6094         /* the comm_point_udp_callback is in a for loop for NUM_UDP_PER_SELECT
6095          * and we set rep.c=NULL to stop if from looking inside the commpoint*/
6096         repinfo->c = NULL;
6097         /* stop the timer */
6098         comm_timer_disable(xfr->task_probe->timer);
6099
6100         /* see if we got a packet and what that means */
6101         if(err == NETEVENT_NOERROR) {
6102                 uint32_t serial = 0;
6103                 if(check_packet_ok(c->buffer, LDNS_RR_TYPE_SOA, xfr,
6104                         &serial)) {
6105                         /* successful lookup */
6106                         if(verbosity >= VERB_ALGO) {
6107                                 char buf[256];
6108                                 dname_str(xfr->name, buf);
6109                                 verbose(VERB_ALGO, "auth zone %s: soa probe "
6110                                         "serial is %u", buf, (unsigned)serial);
6111                         }
6112                         /* see if this serial indicates that the zone has
6113                          * to be updated */
6114                         if(xfr_serial_means_update(xfr, serial)) {
6115                                 /* if updated, start the transfer task, if needed */
6116                                 verbose(VERB_ALGO, "auth_zone updated, start transfer");
6117                                 if(xfr->task_transfer->worker == NULL) {
6118                                         struct auth_master* master =
6119                                                 xfr_probe_current_master(xfr);
6120                                         /* if we have download URLs use them
6121                                          * in preference to this master we
6122                                          * just probed the SOA from */
6123                                         if(xfr->task_transfer->masters &&
6124                                                 xfr->task_transfer->masters->http)
6125                                                 master = NULL;
6126                                         xfr_probe_disown(xfr);
6127                                         xfr_start_transfer(xfr, env, master);
6128                                         return 0;
6129
6130                                 }
6131                                 /* other tasks are running, we don't do this anymore */
6132                                 xfr_probe_disown(xfr);
6133                                 lock_basic_unlock(&xfr->lock);
6134                                 /* return, we don't sent a reply to this udp packet,
6135                                  * and we setup the tasks to do next */
6136                                 return 0;
6137                         } else {
6138                                 verbose(VERB_ALGO, "auth_zone master reports unchanged soa serial");
6139                                 /* we if cannot find updates amongst the
6140                                  * masters, this means we then have a new lease
6141                                  * on the zone */
6142                                 xfr->task_probe->have_new_lease = 1;
6143                         }
6144                 } else {
6145                         if(verbosity >= VERB_ALGO) {
6146                                 char buf[256];
6147                                 dname_str(xfr->name, buf);
6148                                 verbose(VERB_ALGO, "auth zone %s: bad reply to soa probe", buf);
6149                         }
6150                 }
6151         } else {
6152                 if(verbosity >= VERB_ALGO) {
6153                         char buf[256];
6154                         dname_str(xfr->name, buf);
6155                         verbose(VERB_ALGO, "auth zone %s: soa probe failed", buf);
6156                 }
6157         }
6158
6159         /* failed lookup or not an update */
6160         /* delete commpoint so a new one is created, with a fresh port nr */
6161         comm_point_delete(xfr->task_probe->cp);
6162         xfr->task_probe->cp = NULL;
6163
6164         /* if the result was not a successfull probe, we need
6165          * to send the next one */
6166         xfr_probe_nextmaster(xfr);
6167         xfr_probe_send_or_end(xfr, env);
6168         return 0;
6169 }
6170
6171 /** lookup a host name for its addresses, if needed */
6172 static int
6173 xfr_probe_lookup_host(struct auth_xfer* xfr, struct module_env* env)
6174 {
6175         struct sockaddr_storage addr;
6176         socklen_t addrlen = 0;
6177         struct auth_master* master = xfr->task_probe->lookup_target;
6178         struct query_info qinfo;
6179         uint16_t qflags = BIT_RD;
6180         uint8_t dname[LDNS_MAX_DOMAINLEN+1];
6181         struct edns_data edns;
6182         sldns_buffer* buf = env->scratch_buffer;
6183         if(!master) return 0;
6184         if(extstrtoaddr(master->host, &addr, &addrlen)) {
6185                 /* not needed, host is in IP addr format */
6186                 return 0;
6187         }
6188         if(master->allow_notify && !master->http &&
6189                 strchr(master->host, '/') != NULL &&
6190                 strchr(master->host, '/') == strrchr(master->host, '/')) {
6191                 return 0; /* is IP/prefix format, not something to look up */
6192         }
6193
6194         /* use mesh_new_callback to probe for non-addr hosts,
6195          * and then wait for them to be looked up (in cache, or query) */
6196         qinfo.qname_len = sizeof(dname);
6197         if(sldns_str2wire_dname_buf(master->host, dname, &qinfo.qname_len)
6198                 != 0) {
6199                 log_err("cannot parse host name of master %s", master->host);
6200                 return 0;
6201         }
6202         qinfo.qname = dname;
6203         qinfo.qclass = xfr->dclass;
6204         qinfo.qtype = LDNS_RR_TYPE_A;
6205         if(xfr->task_probe->lookup_aaaa)
6206                 qinfo.qtype = LDNS_RR_TYPE_AAAA;
6207         qinfo.local_alias = NULL;
6208         if(verbosity >= VERB_ALGO) {
6209                 char buf1[512];
6210                 char buf2[LDNS_MAX_DOMAINLEN+1];
6211                 dname_str(xfr->name, buf2);
6212                 snprintf(buf1, sizeof(buf1), "auth zone %s: master lookup"
6213                         " for task_probe", buf2);
6214                 log_query_info(VERB_ALGO, buf1, &qinfo);
6215         }
6216         edns.edns_present = 1;
6217         edns.ext_rcode = 0;
6218         edns.edns_version = 0;
6219         edns.bits = EDNS_DO;
6220         edns.opt_list = NULL;
6221         if(sldns_buffer_capacity(buf) < 65535)
6222                 edns.udp_size = (uint16_t)sldns_buffer_capacity(buf);
6223         else    edns.udp_size = 65535;
6224
6225         /* unlock xfr during mesh_new_callback() because the callback can be
6226          * called straight away */
6227         lock_basic_unlock(&xfr->lock);
6228         if(!mesh_new_callback(env->mesh, &qinfo, qflags, &edns, buf, 0,
6229                 &auth_xfer_probe_lookup_callback, xfr)) {
6230                 lock_basic_lock(&xfr->lock);
6231                 log_err("out of memory lookup up master %s", master->host);
6232                 return 0;
6233         }
6234         lock_basic_lock(&xfr->lock);
6235         return 1;
6236 }
6237
6238 /** move to sending the probe packets, next if fails. task_probe */
6239 static void
6240 xfr_probe_send_or_end(struct auth_xfer* xfr, struct module_env* env)
6241 {
6242         /* are we doing hostname lookups? */
6243         while(xfr->task_probe->lookup_target) {
6244                 if(xfr_probe_lookup_host(xfr, env)) {
6245                         /* wait for lookup to finish,
6246                          * note that the hostname may be in unbound's cache
6247                          * and we may then get an instant cache response,
6248                          * and that calls the callback just like a full
6249                          * lookup and lookup failures also call callback */
6250                         if(verbosity >= VERB_ALGO) {
6251                                 char zname[255+1];
6252                                 dname_str(xfr->name, zname);
6253                                 verbose(VERB_ALGO, "auth zone %s probe next target lookup", zname);
6254                         }
6255                         lock_basic_unlock(&xfr->lock);
6256                         return;
6257                 }
6258                 xfr_probe_move_to_next_lookup(xfr, env);
6259         }
6260         /* probe of list has ended.  Create or refresh the list of of
6261          * allow_notify addrs */
6262         probe_copy_masters_for_allow_notify(xfr);
6263         if(verbosity >= VERB_ALGO) {
6264                 char zname[255+1];
6265                 dname_str(xfr->name, zname);
6266                 verbose(VERB_ALGO, "auth zone %s probe: notify addrs updated", zname);
6267         }
6268         if(xfr->task_probe->only_lookup) {
6269                 /* only wanted lookups for copy, stop probe and start wait */
6270                 xfr->task_probe->only_lookup = 0;
6271                 if(verbosity >= VERB_ALGO) {
6272                         char zname[255+1];
6273                         dname_str(xfr->name, zname);
6274                         verbose(VERB_ALGO, "auth zone %s probe: finished only_lookup", zname);
6275                 }
6276                 xfr_probe_disown(xfr);
6277                 if(xfr->task_nextprobe->worker == NULL)
6278                         xfr_set_timeout(xfr, env, 0, 0);
6279                 lock_basic_unlock(&xfr->lock);
6280                 return;
6281         }
6282
6283         /* send probe packets */
6284         while(!xfr_probe_end_of_list(xfr)) {
6285                 if(xfr_probe_send_probe(xfr, env, AUTH_PROBE_TIMEOUT)) {
6286                         /* successfully sent probe, wait for callback */
6287                         lock_basic_unlock(&xfr->lock);
6288                         return;
6289                 }
6290                 /* failed to send probe, next master */
6291                 xfr_probe_nextmaster(xfr);
6292         }
6293
6294         /* done with probe sequence, wait */
6295         if(xfr->task_probe->have_new_lease) {
6296                 /* if zone not updated, start the wait timer again */
6297                 if(verbosity >= VERB_ALGO) {
6298                         char zname[255+1];
6299                         dname_str(xfr->name, zname);
6300                         verbose(VERB_ALGO, "auth_zone %s unchanged, new lease, wait", zname);
6301                 }
6302                 xfr_probe_disown(xfr);
6303                 if(xfr->have_zone)
6304                         xfr->lease_time = *env->now;
6305                 if(xfr->task_nextprobe->worker == NULL)
6306                         xfr_set_timeout(xfr, env, 0, 0);
6307         } else {
6308                 if(verbosity >= VERB_ALGO) {
6309                         char zname[255+1];
6310                         dname_str(xfr->name, zname);
6311                         verbose(VERB_ALGO, "auth zone %s soa probe failed, wait to retry", zname);
6312                 }
6313                 /* we failed to send this as well, move to the wait task,
6314                  * use the shorter retry timeout */
6315                 xfr_probe_disown(xfr);
6316                 /* pick up the nextprobe task and wait */
6317                 if(xfr->task_nextprobe->worker == NULL)
6318                         xfr_set_timeout(xfr, env, 1, 0);
6319         }
6320
6321         lock_basic_unlock(&xfr->lock);
6322 }
6323
6324 /** callback for task_probe lookup of host name, of A or AAAA */
6325 void auth_xfer_probe_lookup_callback(void* arg, int rcode, sldns_buffer* buf,
6326         enum sec_status ATTR_UNUSED(sec), char* ATTR_UNUSED(why_bogus),
6327         int ATTR_UNUSED(was_ratelimited))
6328 {
6329         struct auth_xfer* xfr = (struct auth_xfer*)arg;
6330         struct module_env* env;
6331         log_assert(xfr->task_probe);
6332         lock_basic_lock(&xfr->lock);
6333         env = xfr->task_probe->env;
6334         if(env->outnet->want_to_quit) {
6335                 lock_basic_unlock(&xfr->lock);
6336                 return; /* stop on quit */
6337         }
6338
6339         /* process result */
6340         if(rcode == LDNS_RCODE_NOERROR) {
6341                 uint16_t wanted_qtype = LDNS_RR_TYPE_A;
6342                 struct regional* temp = env->scratch;
6343                 struct query_info rq;
6344                 struct reply_info* rep;
6345                 if(xfr->task_probe->lookup_aaaa)
6346                         wanted_qtype = LDNS_RR_TYPE_AAAA;
6347                 memset(&rq, 0, sizeof(rq));
6348                 rep = parse_reply_in_temp_region(buf, temp, &rq);
6349                 if(rep && rq.qtype == wanted_qtype &&
6350                         FLAGS_GET_RCODE(rep->flags) == LDNS_RCODE_NOERROR) {
6351                         /* parsed successfully */
6352                         struct ub_packed_rrset_key* answer =
6353                                 reply_find_answer_rrset(&rq, rep);
6354                         if(answer) {
6355                                 xfr_master_add_addrs(xfr->task_probe->
6356                                         lookup_target, answer, wanted_qtype);
6357                         } else {
6358                                 if(verbosity >= VERB_ALGO) {
6359                                         char zname[255+1];
6360                                         dname_str(xfr->name, zname);
6361                                         verbose(VERB_ALGO, "auth zone %s host %s type %s probe lookup has nodata", zname, xfr->task_probe->lookup_target->host, (xfr->task_probe->lookup_aaaa?"AAAA":"A"));
6362                                 }
6363                         }
6364                 } else {
6365                         if(verbosity >= VERB_ALGO) {
6366                                 char zname[255+1];
6367                                 dname_str(xfr->name, zname);
6368                                 verbose(VERB_ALGO, "auth zone %s host %s type %s probe lookup has no address", zname, xfr->task_probe->lookup_target->host, (xfr->task_probe->lookup_aaaa?"AAAA":"A"));
6369                         }
6370                 }
6371         } else {
6372                 if(verbosity >= VERB_ALGO) {
6373                         char zname[255+1];
6374                         dname_str(xfr->name, zname);
6375                         verbose(VERB_ALGO, "auth zone %s host %s type %s probe lookup failed", zname, xfr->task_probe->lookup_target->host, (xfr->task_probe->lookup_aaaa?"AAAA":"A"));
6376                 }
6377         }
6378         if(xfr->task_probe->lookup_target->list &&
6379                 xfr->task_probe->lookup_target == xfr_probe_current_master(xfr))
6380                 xfr->task_probe->scan_addr = xfr->task_probe->lookup_target->list;
6381
6382         /* move to lookup AAAA after A lookup, move to next hostname lookup,
6383          * or move to send the probes, or, if nothing to do, end task_probe */
6384         xfr_probe_move_to_next_lookup(xfr, env);
6385         xfr_probe_send_or_end(xfr, env);
6386 }
6387
6388 /** disown task_nextprobe.  caller must hold xfr.lock */
6389 static void
6390 xfr_nextprobe_disown(struct auth_xfer* xfr)
6391 {
6392         /* delete the timer, because the next worker to pick this up may
6393          * not have the same event base */
6394         comm_timer_delete(xfr->task_nextprobe->timer);
6395         xfr->task_nextprobe->timer = NULL;
6396         xfr->task_nextprobe->next_probe = 0;
6397         /* we don't own this item anymore */
6398         xfr->task_nextprobe->worker = NULL;
6399         xfr->task_nextprobe->env = NULL;
6400 }
6401
6402 /** xfer nextprobe timeout callback, this is part of task_nextprobe */
6403 void
6404 auth_xfer_timer(void* arg)
6405 {
6406         struct auth_xfer* xfr = (struct auth_xfer*)arg;
6407         struct module_env* env;
6408         log_assert(xfr->task_nextprobe);
6409         lock_basic_lock(&xfr->lock);
6410         env = xfr->task_nextprobe->env;
6411         if(env->outnet->want_to_quit) {
6412                 lock_basic_unlock(&xfr->lock);
6413                 return; /* stop on quit */
6414         }
6415
6416         /* see if zone has expired, and if so, also set auth_zone expired */
6417         if(xfr->have_zone && !xfr->zone_expired &&
6418            *env->now >= xfr->lease_time + xfr->expiry) {
6419                 lock_basic_unlock(&xfr->lock);
6420                 auth_xfer_set_expired(xfr, env, 1);
6421                 lock_basic_lock(&xfr->lock);
6422         }
6423
6424         xfr_nextprobe_disown(xfr);
6425
6426         if(!xfr_start_probe(xfr, env, NULL)) {
6427                 /* not started because already in progress */
6428                 lock_basic_unlock(&xfr->lock);
6429         }
6430 }
6431
6432 /** return true if there are probe (SOA UDP query) targets in the master list*/
6433 static int
6434 have_probe_targets(struct auth_master* list)
6435 {
6436         struct auth_master* p;
6437         for(p=list; p; p = p->next) {
6438                 if(!p->allow_notify && p->host)
6439                         return 1;
6440         }
6441         return 0;
6442 }
6443
6444 /** start task_probe if possible, if no masters for probe start task_transfer
6445  * returns true if task has been started, and false if the task is already
6446  * in progress. */
6447 static int
6448 xfr_start_probe(struct auth_xfer* xfr, struct module_env* env,
6449         struct auth_master* spec)
6450 {
6451         /* see if we need to start a probe (or maybe it is already in
6452          * progress (due to notify)) */
6453         if(xfr->task_probe->worker == NULL) {
6454                 if(!have_probe_targets(xfr->task_probe->masters) &&
6455                         !(xfr->task_probe->only_lookup &&
6456                         xfr->task_probe->masters != NULL)) {
6457                         /* useless to pick up task_probe, no masters to
6458                          * probe. Instead attempt to pick up task transfer */
6459                         if(xfr->task_transfer->worker == NULL) {
6460                                 xfr_start_transfer(xfr, env, spec);
6461                                 return 1;
6462                         }
6463                         /* task transfer already in progress */
6464                         return 0;
6465                 }
6466
6467                 /* pick up the probe task ourselves */
6468                 xfr->task_probe->worker = env->worker;
6469                 xfr->task_probe->env = env;
6470                 xfr->task_probe->cp = NULL;
6471
6472                 /* start the task */
6473                 /* have not seen a new lease yet, this scan */
6474                 xfr->task_probe->have_new_lease = 0;
6475                 /* if this was a timeout, no specific first master to scan */
6476                 /* otherwise, spec is nonNULL the notified master, scan
6477                  * first and also transfer first from it */
6478                 xfr_probe_start_list(xfr, spec);
6479                 /* setup to start the lookup of hostnames of masters afresh */
6480                 xfr_probe_start_lookups(xfr);
6481                 /* send the probe packet or next send, or end task */
6482                 xfr_probe_send_or_end(xfr, env);
6483                 return 1;
6484         }
6485         return 0;
6486 }
6487
6488 /** for task_nextprobe.
6489  * determine next timeout for auth_xfer. Also (re)sets timer.
6490  * @param xfr: task structure
6491  * @param env: module environment, with worker and time.
6492  * @param failure: set true if timer should be set for failure retry.
6493  * @param lookup_only: only perform lookups when timer done, 0 sec timeout
6494  */
6495 static void
6496 xfr_set_timeout(struct auth_xfer* xfr, struct module_env* env,
6497         int failure, int lookup_only)
6498 {
6499         struct timeval tv;
6500         log_assert(xfr->task_nextprobe != NULL);
6501         log_assert(xfr->task_nextprobe->worker == NULL ||
6502                 xfr->task_nextprobe->worker == env->worker);
6503         /* normally, nextprobe = startoflease + refresh,
6504          * but if expiry is sooner, use that one.
6505          * after a failure, use the retry timer instead. */
6506         xfr->task_nextprobe->next_probe = *env->now;
6507         if(xfr->lease_time && !failure)
6508                 xfr->task_nextprobe->next_probe = xfr->lease_time;
6509
6510         if(!failure) {
6511                 xfr->task_nextprobe->backoff = 0;
6512         } else {
6513                 if(xfr->task_nextprobe->backoff == 0)
6514                                 xfr->task_nextprobe->backoff = 3;
6515                 else    xfr->task_nextprobe->backoff *= 2;
6516                 if(xfr->task_nextprobe->backoff > AUTH_TRANSFER_MAX_BACKOFF)
6517                         xfr->task_nextprobe->backoff =
6518                                 AUTH_TRANSFER_MAX_BACKOFF;
6519         }
6520
6521         if(xfr->have_zone) {
6522                 time_t wait = xfr->refresh;
6523                 if(failure) wait = xfr->retry;
6524                 if(xfr->expiry < wait)
6525                         xfr->task_nextprobe->next_probe += xfr->expiry;
6526                 else    xfr->task_nextprobe->next_probe += wait;
6527                 if(failure)
6528                         xfr->task_nextprobe->next_probe +=
6529                                 xfr->task_nextprobe->backoff;
6530                 /* put the timer exactly on expiry, if possible */
6531                 if(xfr->lease_time && xfr->lease_time+xfr->expiry <
6532                         xfr->task_nextprobe->next_probe &&
6533                         xfr->lease_time+xfr->expiry > *env->now)
6534                         xfr->task_nextprobe->next_probe =
6535                                 xfr->lease_time+xfr->expiry;
6536         } else {
6537                 xfr->task_nextprobe->next_probe +=
6538                         xfr->task_nextprobe->backoff;
6539         }
6540
6541         if(!xfr->task_nextprobe->timer) {
6542                 xfr->task_nextprobe->timer = comm_timer_create(
6543                         env->worker_base, auth_xfer_timer, xfr);
6544                 if(!xfr->task_nextprobe->timer) {
6545                         /* failed to malloc memory. likely zone transfer
6546                          * also fails for that. skip the timeout */
6547                         char zname[255+1];
6548                         dname_str(xfr->name, zname);
6549                         log_err("cannot allocate timer, no refresh for %s",
6550                                 zname);
6551                         return;
6552                 }
6553         }
6554         xfr->task_nextprobe->worker = env->worker;
6555         xfr->task_nextprobe->env = env;
6556         if(*(xfr->task_nextprobe->env->now) <= xfr->task_nextprobe->next_probe)
6557                 tv.tv_sec = xfr->task_nextprobe->next_probe -
6558                         *(xfr->task_nextprobe->env->now);
6559         else    tv.tv_sec = 0;
6560         if(tv.tv_sec != 0 && lookup_only && xfr->task_probe->masters) {
6561                 /* don't lookup_only, if lookup timeout is 0 anyway,
6562                  * or if we don't have masters to lookup */
6563                 tv.tv_sec = 0;
6564                 if(xfr->task_probe && xfr->task_probe->worker == NULL)
6565                         xfr->task_probe->only_lookup = 1;
6566         }
6567         if(verbosity >= VERB_ALGO) {
6568                 char zname[255+1];
6569                 dname_str(xfr->name, zname);
6570                 verbose(VERB_ALGO, "auth zone %s timeout in %d seconds",
6571                         zname, (int)tv.tv_sec);
6572         }
6573         tv.tv_usec = 0;
6574         comm_timer_set(xfr->task_nextprobe->timer, &tv);
6575 }
6576
6577 /** initial pick up of worker timeouts, ties events to worker event loop */
6578 void
6579 auth_xfer_pickup_initial(struct auth_zones* az, struct module_env* env)
6580 {
6581         struct auth_xfer* x;
6582         lock_rw_wrlock(&az->lock);
6583         RBTREE_FOR(x, struct auth_xfer*, &az->xtree) {
6584                 lock_basic_lock(&x->lock);
6585                 /* set lease_time, because we now have timestamp in env,
6586                  * (not earlier during startup and apply_cfg), and this
6587                  * notes the start time when the data was acquired */
6588                 if(x->have_zone)
6589                         x->lease_time = *env->now;
6590                 if(x->task_nextprobe && x->task_nextprobe->worker == NULL) {
6591                         xfr_set_timeout(x, env, 0, 1);
6592                 }
6593                 lock_basic_unlock(&x->lock);
6594         }
6595         lock_rw_unlock(&az->lock);
6596 }
6597
6598 void auth_zones_cleanup(struct auth_zones* az)
6599 {
6600         struct auth_xfer* x;
6601         lock_rw_wrlock(&az->lock);
6602         RBTREE_FOR(x, struct auth_xfer*, &az->xtree) {
6603                 lock_basic_lock(&x->lock);
6604                 if(x->task_nextprobe && x->task_nextprobe->worker != NULL) {
6605                         xfr_nextprobe_disown(x);
6606                 }
6607                 if(x->task_probe && x->task_probe->worker != NULL) {
6608                         xfr_probe_disown(x);
6609                 }
6610                 if(x->task_transfer && x->task_transfer->worker != NULL) {
6611                         auth_chunks_delete(x->task_transfer);
6612                         xfr_transfer_disown(x);
6613                 }
6614                 lock_basic_unlock(&x->lock);
6615         }
6616         lock_rw_unlock(&az->lock);
6617 }
6618
6619 /**
6620  * malloc the xfer and tasks
6621  * @param z: auth_zone with name of zone.
6622  */
6623 static struct auth_xfer*
6624 auth_xfer_new(struct auth_zone* z)
6625 {
6626         struct auth_xfer* xfr;
6627         xfr = (struct auth_xfer*)calloc(1, sizeof(*xfr));
6628         if(!xfr) return NULL;
6629         xfr->name = memdup(z->name, z->namelen);
6630         if(!xfr->name) {
6631                 free(xfr);
6632                 return NULL;
6633         }
6634         xfr->node.key = xfr;
6635         xfr->namelen = z->namelen;
6636         xfr->namelabs = z->namelabs;
6637         xfr->dclass = z->dclass;
6638
6639         xfr->task_nextprobe = (struct auth_nextprobe*)calloc(1,
6640                 sizeof(struct auth_nextprobe));
6641         if(!xfr->task_nextprobe) {
6642                 free(xfr->name);
6643                 free(xfr);
6644                 return NULL;
6645         }
6646         xfr->task_probe = (struct auth_probe*)calloc(1,
6647                 sizeof(struct auth_probe));
6648         if(!xfr->task_probe) {
6649                 free(xfr->task_nextprobe);
6650                 free(xfr->name);
6651                 free(xfr);
6652                 return NULL;
6653         }
6654         xfr->task_transfer = (struct auth_transfer*)calloc(1,
6655                 sizeof(struct auth_transfer));
6656         if(!xfr->task_transfer) {
6657                 free(xfr->task_probe);
6658                 free(xfr->task_nextprobe);
6659                 free(xfr->name);
6660                 free(xfr);
6661                 return NULL;
6662         }
6663
6664         lock_basic_init(&xfr->lock);
6665         lock_protect(&xfr->lock, &xfr->name, sizeof(xfr->name));
6666         lock_protect(&xfr->lock, &xfr->namelen, sizeof(xfr->namelen));
6667         lock_protect(&xfr->lock, xfr->name, xfr->namelen);
6668         lock_protect(&xfr->lock, &xfr->namelabs, sizeof(xfr->namelabs));
6669         lock_protect(&xfr->lock, &xfr->dclass, sizeof(xfr->dclass));
6670         lock_protect(&xfr->lock, &xfr->notify_received, sizeof(xfr->notify_received));
6671         lock_protect(&xfr->lock, &xfr->notify_serial, sizeof(xfr->notify_serial));
6672         lock_protect(&xfr->lock, &xfr->zone_expired, sizeof(xfr->zone_expired));
6673         lock_protect(&xfr->lock, &xfr->have_zone, sizeof(xfr->have_zone));
6674         lock_protect(&xfr->lock, &xfr->serial, sizeof(xfr->serial));
6675         lock_protect(&xfr->lock, &xfr->retry, sizeof(xfr->retry));
6676         lock_protect(&xfr->lock, &xfr->refresh, sizeof(xfr->refresh));
6677         lock_protect(&xfr->lock, &xfr->expiry, sizeof(xfr->expiry));
6678         lock_protect(&xfr->lock, &xfr->lease_time, sizeof(xfr->lease_time));
6679         lock_protect(&xfr->lock, &xfr->task_nextprobe->worker,
6680                 sizeof(xfr->task_nextprobe->worker));
6681         lock_protect(&xfr->lock, &xfr->task_probe->worker,
6682                 sizeof(xfr->task_probe->worker));
6683         lock_protect(&xfr->lock, &xfr->task_transfer->worker,
6684                 sizeof(xfr->task_transfer->worker));
6685         lock_basic_lock(&xfr->lock);
6686         return xfr;
6687 }
6688
6689 /** Create auth_xfer structure.
6690  * This populates the have_zone, soa values, and so on times.
6691  * and sets the timeout, if a zone transfer is needed a short timeout is set.
6692  * For that the auth_zone itself must exist (and read in zonefile)
6693  * returns false on alloc failure. */
6694 struct auth_xfer*
6695 auth_xfer_create(struct auth_zones* az, struct auth_zone* z)
6696 {
6697         struct auth_xfer* xfr;
6698
6699         /* malloc it */
6700         xfr = auth_xfer_new(z);
6701         if(!xfr) {
6702                 log_err("malloc failure");
6703                 return NULL;
6704         }
6705         /* insert in tree */
6706         (void)rbtree_insert(&az->xtree, &xfr->node);
6707         return xfr;
6708 }
6709
6710 /** create new auth_master structure */
6711 static struct auth_master*
6712 auth_master_new(struct auth_master*** list)
6713 {
6714         struct auth_master *m;
6715         m = (struct auth_master*)calloc(1, sizeof(*m));
6716         if(!m) {
6717                 log_err("malloc failure");
6718                 return NULL;
6719         }
6720         /* set first pointer to m, or next pointer of previous element to m */
6721         (**list) = m;
6722         /* store m's next pointer as future point to store at */
6723         (*list) = &(m->next);
6724         return m;
6725 }
6726
6727 /** dup_prefix : create string from initial part of other string, malloced */
6728 static char*
6729 dup_prefix(char* str, size_t num)
6730 {
6731         char* result;
6732         size_t len = strlen(str);
6733         if(len < num) num = len; /* not more than strlen */
6734         result = (char*)malloc(num+1);
6735         if(!result) {
6736                 log_err("malloc failure");
6737                 return result;
6738         }
6739         memmove(result, str, num);
6740         result[num] = 0;
6741         return result;
6742 }
6743
6744 /** dup string and print error on error */
6745 static char*
6746 dup_all(char* str)
6747 {
6748         char* result = strdup(str);
6749         if(!result) {
6750                 log_err("malloc failure");
6751                 return NULL;
6752         }
6753         return result;
6754 }
6755
6756 /** find first of two characters */
6757 static char*
6758 str_find_first_of_chars(char* s, char a, char b)
6759 {
6760         char* ra = strchr(s, a);
6761         char* rb = strchr(s, b);
6762         if(!ra) return rb;
6763         if(!rb) return ra;
6764         if(ra < rb) return ra;
6765         return rb;
6766 }
6767
6768 /** parse URL into host and file parts, false on malloc or parse error */
6769 static int
6770 parse_url(char* url, char** host, char** file, int* port, int* ssl)
6771 {
6772         char* p = url;
6773         /* parse http://www.example.com/file.htm
6774          * or http://127.0.0.1   (index.html)
6775          * or https://[::1@1234]/a/b/c/d */
6776         *ssl = 1;
6777         *port = AUTH_HTTPS_PORT;
6778
6779         /* parse http:// or https:// */
6780         if(strncmp(p, "http://", 7) == 0) {
6781                 p += 7;
6782                 *ssl = 0;
6783                 *port = AUTH_HTTP_PORT;
6784         } else if(strncmp(p, "https://", 8) == 0) {
6785                 p += 8;
6786         } else if(strstr(p, "://") && strchr(p, '/') > strstr(p, "://") &&
6787                 strchr(p, ':') >= strstr(p, "://")) {
6788                 char* uri = dup_prefix(p, (size_t)(strstr(p, "://")-p));
6789                 log_err("protocol %s:// not supported (for url %s)",
6790                         uri?uri:"", p);
6791                 free(uri);
6792                 return 0;
6793         }
6794
6795         /* parse hostname part */
6796         if(p[0] == '[') {
6797                 char* end = strchr(p, ']');
6798                 p++; /* skip over [ */
6799                 if(end) {
6800                         *host = dup_prefix(p, (size_t)(end-p));
6801                         if(!*host) return 0;
6802                         p = end+1; /* skip over ] */
6803                 } else {
6804                         *host = dup_all(p);
6805                         if(!*host) return 0;
6806                         p = end;
6807                 }
6808         } else {
6809                 char* end = str_find_first_of_chars(p, ':', '/');
6810                 if(end) {
6811                         *host = dup_prefix(p, (size_t)(end-p));
6812                         if(!*host) return 0;
6813                 } else {
6814                         *host = dup_all(p);
6815                         if(!*host) return 0;
6816                 }
6817                 p = end; /* at next : or / or NULL */
6818         }
6819
6820         /* parse port number */
6821         if(p && p[0] == ':') {
6822                 char* end = NULL;
6823                 *port = strtol(p+1, &end, 10);
6824                 p = end;
6825         }
6826
6827         /* parse filename part */
6828         while(p && *p == '/')
6829                 p++;
6830         if(!p || p[0] == 0)
6831                 *file = strdup("index.html");
6832         else    *file = strdup(p);
6833         if(!*file) {
6834                 log_err("malloc failure");
6835                 return 0;
6836         }
6837         return 1;
6838 }
6839
6840 int
6841 xfer_set_masters(struct auth_master** list, struct config_auth* c,
6842         int with_http)
6843 {
6844         struct auth_master* m;
6845         struct config_strlist* p;
6846         /* list points to the first, or next pointer for the new element */
6847         while(*list) {
6848                 list = &( (*list)->next );
6849         }
6850         if(with_http)
6851           for(p = c->urls; p; p = p->next) {
6852                 m = auth_master_new(&list);
6853                 m->http = 1;
6854                 if(!parse_url(p->str, &m->host, &m->file, &m->port, &m->ssl))
6855                         return 0;
6856         }
6857         for(p = c->masters; p; p = p->next) {
6858                 m = auth_master_new(&list);
6859                 m->ixfr = 1; /* this flag is not configurable */
6860                 m->host = strdup(p->str);
6861                 if(!m->host) {
6862                         log_err("malloc failure");
6863                         return 0;
6864                 }
6865         }
6866         for(p = c->allow_notify; p; p = p->next) {
6867                 m = auth_master_new(&list);
6868                 m->allow_notify = 1;
6869                 m->host = strdup(p->str);
6870                 if(!m->host) {
6871                         log_err("malloc failure");
6872                         return 0;
6873                 }
6874         }
6875         return 1;
6876 }
6877
6878 #define SERIAL_BITS     32
6879 int
6880 compare_serial(uint32_t a, uint32_t b)
6881 {
6882         const uint32_t cutoff = ((uint32_t) 1 << (SERIAL_BITS - 1));
6883
6884         if (a == b) {
6885                 return 0;
6886         } else if ((a < b && b - a < cutoff) || (a > b && a - b > cutoff)) {
6887                 return -1;
6888         } else {
6889                 return 1;
6890         }
6891 }