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
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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))
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)
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);
183 delegpt_add_addr(struct delegpt* dp, struct regional* region,
184 struct sockaddr_storage* addr, socklen_t addrlen, uint8_t bogus,
185 uint8_t lame, char* tls_auth_name)
187 struct delegpt_addr* a;
188 log_assert(!dp->dp_type_mlc);
189 /* check for duplicates */
190 if((a = delegpt_find_addr(dp, addr, addrlen))) {
198 a = (struct delegpt_addr*)regional_alloc(region,
199 sizeof(struct delegpt_addr));
202 a->next_target = dp->target_list;
205 a->next_usable = dp->usable_list;
207 memcpy(&a->addr, addr, addrlen);
208 a->addrlen = addrlen;
214 a->tls_auth_name = regional_strdup(region, tls_auth_name);
215 if(!a->tls_auth_name)
218 a->tls_auth_name = NULL;
224 delegpt_count_ns(struct delegpt* dp, size_t* numns, size_t* missing)
226 struct delegpt_ns* ns;
229 for(ns = dp->nslist; ns; ns = ns->next) {
237 delegpt_count_addr(struct delegpt* dp, size_t* numaddr, size_t* numres,
240 struct delegpt_addr* a;
244 for(a = dp->target_list; a; a = a->next_target) {
247 for(a = dp->result_list; a; a = a->next_result) {
250 for(a = dp->usable_list; a; a = a->next_usable) {
255 void delegpt_log(enum verbosity_value v, struct delegpt* dp)
257 char buf[LDNS_MAX_DOMAINLEN+1];
258 struct delegpt_ns* ns;
259 struct delegpt_addr* a;
260 size_t missing=0, numns=0, numaddr=0, numres=0, numavail=0;
263 dname_str(dp->name, buf);
264 if(dp->nslist == NULL && dp->target_list == NULL) {
265 log_info("DelegationPoint<%s>: empty", buf);
268 delegpt_count_ns(dp, &numns, &missing);
269 delegpt_count_addr(dp, &numaddr, &numres, &numavail);
270 log_info("DelegationPoint<%s>: %u names (%u missing), "
271 "%u addrs (%u result, %u avail)%s",
272 buf, (unsigned)numns, (unsigned)missing,
273 (unsigned)numaddr, (unsigned)numres, (unsigned)numavail,
274 (dp->has_parent_side_NS?" parentNS":" cacheNS"));
275 if(verbosity >= VERB_ALGO) {
276 for(ns = dp->nslist; ns; ns = ns->next) {
277 dname_str(ns->name, buf);
278 log_info(" %s %s%s%s%s%s%s%s", buf,
279 (ns->resolved?"*":""),
280 (ns->got4?" A":""), (ns->got6?" AAAA":""),
281 (dp->bogus?" BOGUS":""), (ns->lame?" PARENTSIDE":""),
282 (ns->done_pside4?" PSIDE_A":""),
283 (ns->done_pside6?" PSIDE_AAAA":""));
285 for(a = dp->target_list; a; a = a->next_target) {
287 const char* str = " ";
288 if(a->bogus && a->lame) str = " BOGUS ADDR_LAME ";
289 else if(a->bogus) str = " BOGUS ";
290 else if(a->lame) str = " ADDR_LAME ";
292 snprintf(s, sizeof(s), "%s[%s]", str,
294 else snprintf(s, sizeof(s), "%s", str);
295 log_addr(VERB_ALGO, s, &a->addr, a->addrlen);
301 delegpt_add_unused_targets(struct delegpt* dp)
303 struct delegpt_addr* usa = dp->usable_list;
304 dp->usable_list = NULL;
306 usa->next_result = dp->result_list;
307 dp->result_list = usa;
308 usa = usa->next_usable;
313 delegpt_count_targets(struct delegpt* dp)
315 struct delegpt_addr* a;
317 for(a = dp->target_list; a; a = a->next_target)
323 delegpt_count_missing_targets(struct delegpt* dp)
325 struct delegpt_ns* ns;
327 for(ns = dp->nslist; ns; ns = ns->next)
333 /** find NS rrset in given list */
334 static struct ub_packed_rrset_key*
335 find_NS(struct reply_info* rep, size_t from, size_t to)
338 for(i=from; i<to; i++) {
339 if(ntohs(rep->rrsets[i]->rk.type) == LDNS_RR_TYPE_NS)
340 return rep->rrsets[i];
346 delegpt_from_message(struct dns_msg* msg, struct regional* region)
348 struct ub_packed_rrset_key* ns_rrset = NULL;
351 /* look for NS records in the authority section... */
352 ns_rrset = find_NS(msg->rep, msg->rep->an_numrrsets,
353 msg->rep->an_numrrsets+msg->rep->ns_numrrsets);
355 /* In some cases (even legitimate, perfectly legal cases), the
356 * NS set for the "referral" might be in the answer section. */
358 ns_rrset = find_NS(msg->rep, 0, msg->rep->an_numrrsets);
360 /* If there was no NS rrset in the authority section, then this
361 * wasn't a referral message. (It might not actually be a
362 * referral message anyway) */
366 /* If we found any, then Yay! we have a delegation point. */
367 dp = delegpt_create(region);
370 dp->has_parent_side_NS = 1; /* created from message */
371 if(!delegpt_set_name(dp, region, ns_rrset->rk.dname))
373 if(!delegpt_rrset_add_ns(dp, region, ns_rrset, 0))
376 /* add glue, A and AAAA in answer and additional section */
377 for(i=0; i<msg->rep->rrset_count; i++) {
378 struct ub_packed_rrset_key* s = msg->rep->rrsets[i];
379 /* skip auth section. FIXME really needed?*/
380 if(msg->rep->an_numrrsets <= i &&
381 i < (msg->rep->an_numrrsets+msg->rep->ns_numrrsets))
384 if(ntohs(s->rk.type) == LDNS_RR_TYPE_A) {
385 if(!delegpt_add_rrset_A(dp, region, s, 0))
387 } else if(ntohs(s->rk.type) == LDNS_RR_TYPE_AAAA) {
388 if(!delegpt_add_rrset_AAAA(dp, region, s, 0))
396 delegpt_rrset_add_ns(struct delegpt* dp, struct regional* region,
397 struct ub_packed_rrset_key* ns_rrset, uint8_t lame)
399 struct packed_rrset_data* nsdata = (struct packed_rrset_data*)
400 ns_rrset->entry.data;
402 log_assert(!dp->dp_type_mlc);
403 if(nsdata->security == sec_status_bogus)
405 for(i=0; i<nsdata->count; i++) {
406 if(nsdata->rr_len[i] < 2+1) continue; /* len + root label */
407 if(dname_valid(nsdata->rr_data[i]+2, nsdata->rr_len[i]-2) !=
408 (size_t)sldns_read_uint16(nsdata->rr_data[i]))
409 continue; /* bad format */
410 /* add rdata of NS (= wirefmt dname), skip rdatalen bytes */
411 if(!delegpt_add_ns(dp, region, nsdata->rr_data[i]+2, lame))
418 delegpt_add_rrset_A(struct delegpt* dp, struct regional* region,
419 struct ub_packed_rrset_key* ak, uint8_t lame)
421 struct packed_rrset_data* d=(struct packed_rrset_data*)ak->entry.data;
423 struct sockaddr_in sa;
424 socklen_t len = (socklen_t)sizeof(sa);
425 log_assert(!dp->dp_type_mlc);
427 sa.sin_family = AF_INET;
428 sa.sin_port = (in_port_t)htons(UNBOUND_DNS_PORT);
429 for(i=0; i<d->count; i++) {
430 if(d->rr_len[i] != 2 + INET_SIZE)
432 memmove(&sa.sin_addr, d->rr_data[i]+2, INET_SIZE);
433 if(!delegpt_add_target(dp, region, ak->rk.dname,
434 ak->rk.dname_len, (struct sockaddr_storage*)&sa,
435 len, (d->security==sec_status_bogus), lame))
442 delegpt_add_rrset_AAAA(struct delegpt* dp, struct regional* region,
443 struct ub_packed_rrset_key* ak, uint8_t lame)
445 struct packed_rrset_data* d=(struct packed_rrset_data*)ak->entry.data;
447 struct sockaddr_in6 sa;
448 socklen_t len = (socklen_t)sizeof(sa);
449 log_assert(!dp->dp_type_mlc);
451 sa.sin6_family = AF_INET6;
452 sa.sin6_port = (in_port_t)htons(UNBOUND_DNS_PORT);
453 for(i=0; i<d->count; i++) {
454 if(d->rr_len[i] != 2 + INET6_SIZE) /* rdatalen + len of IP6 */
456 memmove(&sa.sin6_addr, d->rr_data[i]+2, INET6_SIZE);
457 if(!delegpt_add_target(dp, region, ak->rk.dname,
458 ak->rk.dname_len, (struct sockaddr_storage*)&sa,
459 len, (d->security==sec_status_bogus), lame))
466 delegpt_add_rrset(struct delegpt* dp, struct regional* region,
467 struct ub_packed_rrset_key* rrset, uint8_t lame)
471 if(ntohs(rrset->rk.type) == LDNS_RR_TYPE_NS)
472 return delegpt_rrset_add_ns(dp, region, rrset, lame);
473 else if(ntohs(rrset->rk.type) == LDNS_RR_TYPE_A)
474 return delegpt_add_rrset_A(dp, region, rrset, lame);
475 else if(ntohs(rrset->rk.type) == LDNS_RR_TYPE_AAAA)
476 return delegpt_add_rrset_AAAA(dp, region, rrset, lame);
477 log_warn("Unknown rrset type added to delegpt");
481 void delegpt_add_neg_msg(struct delegpt* dp, struct msgreply_entry* msg)
483 struct reply_info* rep = (struct reply_info*)msg->entry.data;
486 /* if error or no answers */
487 if(FLAGS_GET_RCODE(rep->flags) != 0 || rep->an_numrrsets == 0) {
488 struct delegpt_ns* ns = delegpt_find_ns(dp, msg->key.qname,
491 if(msg->key.qtype == LDNS_RR_TYPE_A)
493 else if(msg->key.qtype == LDNS_RR_TYPE_AAAA)
495 if(ns->got4 && ns->got6)
501 void delegpt_no_ipv6(struct delegpt* dp)
503 struct delegpt_ns* ns;
504 for(ns = dp->nslist; ns; ns = ns->next) {
505 /* no ipv6, so only ipv4 is enough to resolve a nameserver */
511 void delegpt_no_ipv4(struct delegpt* dp)
513 struct delegpt_ns* ns;
514 for(ns = dp->nslist; ns; ns = ns->next) {
515 /* no ipv4, so only ipv6 is enough to resolve a nameserver */
521 struct delegpt* delegpt_create_mlc(uint8_t* name)
523 struct delegpt* dp=(struct delegpt*)calloc(1, sizeof(*dp));
528 dp->namelabs = dname_count_size_labels(name, &dp->namelen);
529 dp->name = memdup(name, dp->namelen);
538 void delegpt_free_mlc(struct delegpt* dp)
540 struct delegpt_ns* n, *nn;
541 struct delegpt_addr* a, *na;
543 log_assert(dp->dp_type_mlc);
554 free(a->tls_auth_name);
562 int delegpt_set_name_mlc(struct delegpt* dp, uint8_t* name)
564 log_assert(dp->dp_type_mlc);
565 dp->namelabs = dname_count_size_labels(name, &dp->namelen);
566 dp->name = memdup(name, dp->namelen);
567 return (dp->name != NULL);
570 int delegpt_add_ns_mlc(struct delegpt* dp, uint8_t* name, uint8_t lame)
572 struct delegpt_ns* ns;
574 (void)dname_count_size_labels(name, &len);
575 log_assert(dp->dp_type_mlc);
576 /* slow check for duplicates to avoid counting failures when
577 * adding the same server as a dependency twice */
578 if(delegpt_find_ns(dp, name, len))
580 ns = (struct delegpt_ns*)malloc(sizeof(struct delegpt_ns));
584 ns->name = memdup(name, ns->namelen);
589 ns->next = dp->nslist;
594 ns->lame = (uint8_t)lame;
600 int delegpt_add_addr_mlc(struct delegpt* dp, struct sockaddr_storage* addr,
601 socklen_t addrlen, uint8_t bogus, uint8_t lame, char* tls_auth_name)
603 struct delegpt_addr* a;
604 log_assert(dp->dp_type_mlc);
605 /* check for duplicates */
606 if((a = delegpt_find_addr(dp, addr, addrlen))) {
614 a = (struct delegpt_addr*)malloc(sizeof(struct delegpt_addr));
617 a->next_target = dp->target_list;
620 a->next_usable = dp->usable_list;
622 memcpy(&a->addr, addr, addrlen);
623 a->addrlen = addrlen;
629 a->tls_auth_name = strdup(tls_auth_name);
630 if(!a->tls_auth_name) {
635 a->tls_auth_name = NULL;
640 int delegpt_add_target_mlc(struct delegpt* dp, uint8_t* name, size_t namelen,
641 struct sockaddr_storage* addr, socklen_t addrlen, uint8_t bogus,
644 struct delegpt_ns* ns = delegpt_find_ns(dp, name, namelen);
645 log_assert(dp->dp_type_mlc);
651 if(addr_is_ip6(addr, addrlen))
654 if(ns->got4 && ns->got6)
657 return delegpt_add_addr_mlc(dp, addr, addrlen, bogus, lame, NULL);
660 size_t delegpt_get_mem(struct delegpt* dp)
662 struct delegpt_ns* ns;
665 s = sizeof(*dp) + dp->namelen +
666 delegpt_count_targets(dp)*sizeof(struct delegpt_addr);
667 for(ns=dp->nslist; ns; ns=ns->next)
668 s += sizeof(*ns)+ns->namelen;