2 * iterator/iter_delegpt.c - delegation point with NS and address information.
4 * Copyright (c) 2007, NLnet Labs. All rights reserved.
6 * This software is open source.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * Redistributions of source code must retain the above copyright notice,
13 * this list of conditions and the following disclaimer.
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.
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.
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.
39 * This file implements the Delegation Point. It contains a list of name servers
40 * and their addresses if known.
43 #include "iterator/iter_delegpt.h"
44 #include "services/cache/dns.h"
45 #include "util/regional.h"
46 #include "util/data/dname.h"
47 #include "util/data/packed_rrset.h"
48 #include "util/data/msgreply.h"
49 #include "util/net_help.h"
50 #include "sldns/rrdef.h"
51 #include "sldns/sbuffer.h"
54 delegpt_create(struct regional* region)
56 struct delegpt* dp=(struct delegpt*)regional_alloc(
60 memset(dp, 0, sizeof(*dp));
64 struct delegpt* delegpt_copy(struct delegpt* dp, struct regional* region)
66 struct delegpt* copy = delegpt_create(region);
67 struct delegpt_ns* ns;
68 struct delegpt_addr* a;
71 if(!delegpt_set_name(copy, region, dp->name))
73 copy->bogus = dp->bogus;
74 copy->has_parent_side_NS = dp->has_parent_side_NS;
75 copy->ssl_upstream = dp->ssl_upstream;
76 for(ns = dp->nslist; ns; ns = ns->next) {
77 if(!delegpt_add_ns(copy, region, ns->name, ns->lame))
79 copy->nslist->resolved = ns->resolved;
80 copy->nslist->got4 = ns->got4;
81 copy->nslist->got6 = ns->got6;
82 copy->nslist->done_pside4 = ns->done_pside4;
83 copy->nslist->done_pside6 = ns->done_pside6;
85 for(a = dp->target_list; a; a = a->next_target) {
86 if(!delegpt_add_addr(copy, region, &a->addr, a->addrlen,
87 a->bogus, a->lame, a->tls_auth_name, NULL))
94 delegpt_set_name(struct delegpt* dp, struct regional* region, uint8_t* name)
96 log_assert(!dp->dp_type_mlc);
97 dp->namelabs = dname_count_size_labels(name, &dp->namelen);
98 dp->name = regional_alloc_init(region, name, dp->namelen);
103 delegpt_add_ns(struct delegpt* dp, struct regional* region, uint8_t* name,
106 struct delegpt_ns* ns;
108 (void)dname_count_size_labels(name, &len);
109 log_assert(!dp->dp_type_mlc);
110 /* slow check for duplicates to avoid counting failures when
111 * adding the same server as a dependency twice */
112 if(delegpt_find_ns(dp, name, len))
114 ns = (struct delegpt_ns*)regional_alloc(region,
115 sizeof(struct delegpt_ns));
118 ns->next = dp->nslist;
121 ns->name = regional_alloc_init(region, name, ns->namelen);
128 return ns->name != 0;
132 delegpt_find_ns(struct delegpt* dp, uint8_t* name, size_t namelen)
134 struct delegpt_ns* p = dp->nslist;
136 if(namelen == p->namelen &&
137 query_dname_compare(name, p->name) == 0) {
146 delegpt_find_addr(struct delegpt* dp, struct sockaddr_storage* addr,
149 struct delegpt_addr* p = dp->target_list;
151 if(sockaddr_cmp_addr(addr, addrlen, &p->addr, p->addrlen)==0
152 && ((struct sockaddr_in*)addr)->sin_port ==
153 ((struct sockaddr_in*)&p->addr)->sin_port) {
162 delegpt_add_target(struct delegpt* dp, struct regional* region,
163 uint8_t* name, size_t namelen, struct sockaddr_storage* addr,
164 socklen_t addrlen, uint8_t bogus, uint8_t lame, int* additions)
166 struct delegpt_ns* ns = delegpt_find_ns(dp, name, namelen);
167 log_assert(!dp->dp_type_mlc);
173 if(addr_is_ip6(addr, addrlen))
176 if(ns->got4 && ns->got6)
179 return delegpt_add_addr(dp, region, addr, addrlen, bogus, lame, NULL,
184 delegpt_add_addr(struct delegpt* dp, struct regional* region,
185 struct sockaddr_storage* addr, socklen_t addrlen, uint8_t bogus,
186 uint8_t lame, char* tls_auth_name, int* additions)
188 struct delegpt_addr* a;
189 log_assert(!dp->dp_type_mlc);
190 /* check for duplicates */
191 if((a = delegpt_find_addr(dp, addr, addrlen))) {
201 a = (struct delegpt_addr*)regional_alloc(region,
202 sizeof(struct delegpt_addr));
205 a->next_target = dp->target_list;
208 a->next_usable = dp->usable_list;
210 memcpy(&a->addr, addr, addrlen);
211 a->addrlen = addrlen;
217 a->tls_auth_name = regional_strdup(region, tls_auth_name);
218 if(!a->tls_auth_name)
221 a->tls_auth_name = NULL;
227 delegpt_count_ns(struct delegpt* dp, size_t* numns, size_t* missing)
229 struct delegpt_ns* ns;
232 for(ns = dp->nslist; ns; ns = ns->next) {
240 delegpt_count_addr(struct delegpt* dp, size_t* numaddr, size_t* numres,
243 struct delegpt_addr* a;
247 for(a = dp->target_list; a; a = a->next_target) {
250 for(a = dp->result_list; a; a = a->next_result) {
253 for(a = dp->usable_list; a; a = a->next_usable) {
258 void delegpt_log(enum verbosity_value v, struct delegpt* dp)
260 char buf[LDNS_MAX_DOMAINLEN+1];
261 struct delegpt_ns* ns;
262 struct delegpt_addr* a;
263 size_t missing=0, numns=0, numaddr=0, numres=0, numavail=0;
266 dname_str(dp->name, buf);
267 if(dp->nslist == NULL && dp->target_list == NULL) {
268 log_info("DelegationPoint<%s>: empty", buf);
271 delegpt_count_ns(dp, &numns, &missing);
272 delegpt_count_addr(dp, &numaddr, &numres, &numavail);
273 log_info("DelegationPoint<%s>: %u names (%u missing), "
274 "%u addrs (%u result, %u avail)%s",
275 buf, (unsigned)numns, (unsigned)missing,
276 (unsigned)numaddr, (unsigned)numres, (unsigned)numavail,
277 (dp->has_parent_side_NS?" parentNS":" cacheNS"));
278 if(verbosity >= VERB_ALGO) {
279 for(ns = dp->nslist; ns; ns = ns->next) {
280 dname_str(ns->name, buf);
281 log_info(" %s %s%s%s%s%s%s%s", buf,
282 (ns->resolved?"*":""),
283 (ns->got4?" A":""), (ns->got6?" AAAA":""),
284 (dp->bogus?" BOGUS":""), (ns->lame?" PARENTSIDE":""),
285 (ns->done_pside4?" PSIDE_A":""),
286 (ns->done_pside6?" PSIDE_AAAA":""));
288 for(a = dp->target_list; a; a = a->next_target) {
290 const char* str = " ";
291 if(a->bogus && a->lame) str = " BOGUS ADDR_LAME ";
292 else if(a->bogus) str = " BOGUS ";
293 else if(a->lame) str = " ADDR_LAME ";
295 snprintf(s, sizeof(s), "%s[%s]", str,
297 else snprintf(s, sizeof(s), "%s", str);
298 log_addr(VERB_ALGO, s, &a->addr, a->addrlen);
304 delegpt_add_unused_targets(struct delegpt* dp)
306 struct delegpt_addr* usa = dp->usable_list;
307 dp->usable_list = NULL;
309 usa->next_result = dp->result_list;
310 dp->result_list = usa;
311 usa = usa->next_usable;
316 delegpt_count_targets(struct delegpt* dp)
318 struct delegpt_addr* a;
320 for(a = dp->target_list; a; a = a->next_target)
326 delegpt_count_missing_targets(struct delegpt* dp)
328 struct delegpt_ns* ns;
330 for(ns = dp->nslist; ns; ns = ns->next)
336 /** find NS rrset in given list */
337 static struct ub_packed_rrset_key*
338 find_NS(struct reply_info* rep, size_t from, size_t to)
341 for(i=from; i<to; i++) {
342 if(ntohs(rep->rrsets[i]->rk.type) == LDNS_RR_TYPE_NS)
343 return rep->rrsets[i];
349 delegpt_from_message(struct dns_msg* msg, struct regional* region)
351 struct ub_packed_rrset_key* ns_rrset = NULL;
354 /* look for NS records in the authority section... */
355 ns_rrset = find_NS(msg->rep, msg->rep->an_numrrsets,
356 msg->rep->an_numrrsets+msg->rep->ns_numrrsets);
358 /* In some cases (even legitimate, perfectly legal cases), the
359 * NS set for the "referral" might be in the answer section. */
361 ns_rrset = find_NS(msg->rep, 0, msg->rep->an_numrrsets);
363 /* If there was no NS rrset in the authority section, then this
364 * wasn't a referral message. (It might not actually be a
365 * referral message anyway) */
369 /* If we found any, then Yay! we have a delegation point. */
370 dp = delegpt_create(region);
373 dp->has_parent_side_NS = 1; /* created from message */
374 if(!delegpt_set_name(dp, region, ns_rrset->rk.dname))
376 if(!delegpt_rrset_add_ns(dp, region, ns_rrset, 0))
379 /* add glue, A and AAAA in answer and additional section */
380 for(i=0; i<msg->rep->rrset_count; i++) {
381 struct ub_packed_rrset_key* s = msg->rep->rrsets[i];
382 /* skip auth section. FIXME really needed?*/
383 if(msg->rep->an_numrrsets <= i &&
384 i < (msg->rep->an_numrrsets+msg->rep->ns_numrrsets))
387 if(ntohs(s->rk.type) == LDNS_RR_TYPE_A) {
388 if(!delegpt_add_rrset_A(dp, region, s, 0, NULL))
390 } else if(ntohs(s->rk.type) == LDNS_RR_TYPE_AAAA) {
391 if(!delegpt_add_rrset_AAAA(dp, region, s, 0, NULL))
399 delegpt_rrset_add_ns(struct delegpt* dp, struct regional* region,
400 struct ub_packed_rrset_key* ns_rrset, uint8_t lame)
402 struct packed_rrset_data* nsdata = (struct packed_rrset_data*)
403 ns_rrset->entry.data;
405 log_assert(!dp->dp_type_mlc);
406 if(nsdata->security == sec_status_bogus)
408 for(i=0; i<nsdata->count; i++) {
409 if(nsdata->rr_len[i] < 2+1) continue; /* len + root label */
410 if(dname_valid(nsdata->rr_data[i]+2, nsdata->rr_len[i]-2) !=
411 (size_t)sldns_read_uint16(nsdata->rr_data[i]))
412 continue; /* bad format */
413 /* add rdata of NS (= wirefmt dname), skip rdatalen bytes */
414 if(!delegpt_add_ns(dp, region, nsdata->rr_data[i]+2, lame))
421 delegpt_add_rrset_A(struct delegpt* dp, struct regional* region,
422 struct ub_packed_rrset_key* ak, uint8_t lame, int* additions)
424 struct packed_rrset_data* d=(struct packed_rrset_data*)ak->entry.data;
426 struct sockaddr_in sa;
427 socklen_t len = (socklen_t)sizeof(sa);
428 log_assert(!dp->dp_type_mlc);
430 sa.sin_family = AF_INET;
431 sa.sin_port = (in_port_t)htons(UNBOUND_DNS_PORT);
432 for(i=0; i<d->count; i++) {
433 if(d->rr_len[i] != 2 + INET_SIZE)
435 memmove(&sa.sin_addr, d->rr_data[i]+2, INET_SIZE);
436 if(!delegpt_add_target(dp, region, ak->rk.dname,
437 ak->rk.dname_len, (struct sockaddr_storage*)&sa,
438 len, (d->security==sec_status_bogus), lame, additions))
445 delegpt_add_rrset_AAAA(struct delegpt* dp, struct regional* region,
446 struct ub_packed_rrset_key* ak, uint8_t lame, int* additions)
448 struct packed_rrset_data* d=(struct packed_rrset_data*)ak->entry.data;
450 struct sockaddr_in6 sa;
451 socklen_t len = (socklen_t)sizeof(sa);
452 log_assert(!dp->dp_type_mlc);
454 sa.sin6_family = AF_INET6;
455 sa.sin6_port = (in_port_t)htons(UNBOUND_DNS_PORT);
456 for(i=0; i<d->count; i++) {
457 if(d->rr_len[i] != 2 + INET6_SIZE) /* rdatalen + len of IP6 */
459 memmove(&sa.sin6_addr, d->rr_data[i]+2, INET6_SIZE);
460 if(!delegpt_add_target(dp, region, ak->rk.dname,
461 ak->rk.dname_len, (struct sockaddr_storage*)&sa,
462 len, (d->security==sec_status_bogus), lame, additions))
469 delegpt_add_rrset(struct delegpt* dp, struct regional* region,
470 struct ub_packed_rrset_key* rrset, uint8_t lame, int* additions)
474 if(ntohs(rrset->rk.type) == LDNS_RR_TYPE_NS)
475 return delegpt_rrset_add_ns(dp, region, rrset, lame);
476 else if(ntohs(rrset->rk.type) == LDNS_RR_TYPE_A)
477 return delegpt_add_rrset_A(dp, region, rrset, lame, additions);
478 else if(ntohs(rrset->rk.type) == LDNS_RR_TYPE_AAAA)
479 return delegpt_add_rrset_AAAA(dp, region, rrset, lame,
481 log_warn("Unknown rrset type added to delegpt");
485 void delegpt_mark_neg(struct delegpt_ns* ns, uint16_t qtype)
488 if(qtype == LDNS_RR_TYPE_A)
490 else if(qtype == LDNS_RR_TYPE_AAAA)
492 if(ns->got4 && ns->got6)
497 void delegpt_add_neg_msg(struct delegpt* dp, struct msgreply_entry* msg)
499 struct reply_info* rep = (struct reply_info*)msg->entry.data;
502 /* if error or no answers */
503 if(FLAGS_GET_RCODE(rep->flags) != 0 || rep->an_numrrsets == 0) {
504 struct delegpt_ns* ns = delegpt_find_ns(dp, msg->key.qname,
506 delegpt_mark_neg(ns, msg->key.qtype);
510 void delegpt_no_ipv6(struct delegpt* dp)
512 struct delegpt_ns* ns;
513 for(ns = dp->nslist; ns; ns = ns->next) {
514 /* no ipv6, so only ipv4 is enough to resolve a nameserver */
520 void delegpt_no_ipv4(struct delegpt* dp)
522 struct delegpt_ns* ns;
523 for(ns = dp->nslist; ns; ns = ns->next) {
524 /* no ipv4, so only ipv6 is enough to resolve a nameserver */
530 struct delegpt* delegpt_create_mlc(uint8_t* name)
532 struct delegpt* dp=(struct delegpt*)calloc(1, sizeof(*dp));
537 dp->namelabs = dname_count_size_labels(name, &dp->namelen);
538 dp->name = memdup(name, dp->namelen);
547 void delegpt_free_mlc(struct delegpt* dp)
549 struct delegpt_ns* n, *nn;
550 struct delegpt_addr* a, *na;
552 log_assert(dp->dp_type_mlc);
563 free(a->tls_auth_name);
571 int delegpt_set_name_mlc(struct delegpt* dp, uint8_t* name)
573 log_assert(dp->dp_type_mlc);
574 dp->namelabs = dname_count_size_labels(name, &dp->namelen);
575 dp->name = memdup(name, dp->namelen);
576 return (dp->name != NULL);
579 int delegpt_add_ns_mlc(struct delegpt* dp, uint8_t* name, uint8_t lame)
581 struct delegpt_ns* ns;
583 (void)dname_count_size_labels(name, &len);
584 log_assert(dp->dp_type_mlc);
585 /* slow check for duplicates to avoid counting failures when
586 * adding the same server as a dependency twice */
587 if(delegpt_find_ns(dp, name, len))
589 ns = (struct delegpt_ns*)malloc(sizeof(struct delegpt_ns));
593 ns->name = memdup(name, ns->namelen);
598 ns->next = dp->nslist;
603 ns->lame = (uint8_t)lame;
609 int delegpt_add_addr_mlc(struct delegpt* dp, struct sockaddr_storage* addr,
610 socklen_t addrlen, uint8_t bogus, uint8_t lame, char* tls_auth_name)
612 struct delegpt_addr* a;
613 log_assert(dp->dp_type_mlc);
614 /* check for duplicates */
615 if((a = delegpt_find_addr(dp, addr, addrlen))) {
623 a = (struct delegpt_addr*)malloc(sizeof(struct delegpt_addr));
626 a->next_target = dp->target_list;
629 a->next_usable = dp->usable_list;
631 memcpy(&a->addr, addr, addrlen);
632 a->addrlen = addrlen;
638 a->tls_auth_name = strdup(tls_auth_name);
639 if(!a->tls_auth_name) {
644 a->tls_auth_name = NULL;
649 int delegpt_add_target_mlc(struct delegpt* dp, uint8_t* name, size_t namelen,
650 struct sockaddr_storage* addr, socklen_t addrlen, uint8_t bogus,
653 struct delegpt_ns* ns = delegpt_find_ns(dp, name, namelen);
654 log_assert(dp->dp_type_mlc);
660 if(addr_is_ip6(addr, addrlen))
663 if(ns->got4 && ns->got6)
666 return delegpt_add_addr_mlc(dp, addr, addrlen, bogus, lame, NULL);
669 size_t delegpt_get_mem(struct delegpt* dp)
671 struct delegpt_ns* ns;
674 s = sizeof(*dp) + dp->namelen +
675 delegpt_count_targets(dp)*sizeof(struct delegpt_addr);
676 for(ns=dp->nslist; ns; ns=ns->next)
677 s += sizeof(*ns)+ns->namelen;