2 * unbound.c - unbound validating resolver public API implementation
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 contains functions to resolve DNS queries and
40 * validate the answers. Synchonously and asynchronously.
44 /* include the public api first, it should be able to stand alone */
45 #include "libunbound/unbound.h"
46 #include "libunbound/unbound-event.h"
49 #include "libunbound/context.h"
50 #include "libunbound/libworker.h"
51 #include "util/locks.h"
52 #include "util/config_file.h"
53 #include "util/alloc.h"
54 #include "util/module.h"
55 #include "util/regional.h"
57 #include "util/random.h"
58 #include "util/net_help.h"
59 #include "util/tube.h"
60 #include "services/modstack.h"
61 #include "services/localzone.h"
62 #include "services/cache/infra.h"
63 #include "services/cache/rrset.h"
64 #include "ldns/sbuffer.h"
69 #if defined(UB_ON_WINDOWS) && defined (HAVE_WINDOWS_H)
72 #endif /* UB_ON_WINDOWS */
74 /** create context functionality, but no pipes */
75 static struct ub_ctx* ub_ctx_create_nopipe(void)
84 log_init(NULL, 0, NULL); /* logs to stderr */
85 log_ident_set("libunbound");
87 if((r = WSAStartup(MAKEWORD(2,2), &wsa_data)) != 0) {
88 log_err("could not init winsock. WSAStartup: %s",
93 verbosity = 0; /* errors only */
95 ctx = (struct ub_ctx*)calloc(1, sizeof(*ctx));
100 alloc_init(&ctx->superalloc, NULL, 0);
101 seed = (unsigned int)time(NULL) ^ (unsigned int)getpid();
102 if(!(ctx->seed_rnd = ub_initstate(seed, NULL))) {
104 ub_randfree(ctx->seed_rnd);
110 lock_basic_init(&ctx->qqpipe_lock);
111 lock_basic_init(&ctx->rrpipe_lock);
112 lock_basic_init(&ctx->cfglock);
113 ctx->env = (struct module_env*)calloc(1, sizeof(*ctx->env));
115 ub_randfree(ctx->seed_rnd);
120 ctx->env->cfg = config_create_forlib();
123 ub_randfree(ctx->seed_rnd);
128 ctx->env->alloc = &ctx->superalloc;
129 ctx->env->worker = NULL;
130 ctx->env->need_to_validate = 0;
131 modstack_init(&ctx->mods);
132 rbtree_init(&ctx->queries, &context_query_cmp);
139 struct ub_ctx* ctx = ub_ctx_create_nopipe();
142 if((ctx->qq_pipe = tube_create()) == NULL) {
144 ub_randfree(ctx->seed_rnd);
145 config_delete(ctx->env->cfg);
146 modstack_desetup(&ctx->mods, ctx->env);
152 if((ctx->rr_pipe = tube_create()) == NULL) {
154 tube_delete(ctx->qq_pipe);
155 ub_randfree(ctx->seed_rnd);
156 config_delete(ctx->env->cfg);
157 modstack_desetup(&ctx->mods, ctx->env);
167 ub_ctx_create_event(struct event_base* eb)
169 struct ub_ctx* ctx = ub_ctx_create_nopipe();
172 /* no pipes, but we have the locks to make sure everything works */
174 ctx->dothread = 1; /* the processing is in the same process,
175 makes ub_cancel and ub_ctx_delete do the right thing */
176 ctx->event_base = eb;
182 delq(rbnode_t* n, void* ATTR_UNUSED(arg))
184 struct ctx_query* q = (struct ctx_query*)n;
185 context_query_delete(q);
188 /** stop the bg thread */
189 static void ub_stop_bg(struct ub_ctx* ctx)
191 /* stop the bg thread */
192 lock_basic_lock(&ctx->cfglock);
193 if(ctx->created_bg) {
196 uint32_t cmd = UB_LIBCMD_QUIT;
197 lock_basic_unlock(&ctx->cfglock);
198 lock_basic_lock(&ctx->qqpipe_lock);
199 (void)tube_write_msg(ctx->qq_pipe, (uint8_t*)&cmd,
200 (uint32_t)sizeof(cmd), 0);
201 lock_basic_unlock(&ctx->qqpipe_lock);
202 lock_basic_lock(&ctx->rrpipe_lock);
203 while(tube_read_msg(ctx->rr_pipe, &msg, &len, 0)) {
204 /* discard all results except a quit confirm */
205 if(context_serial_getcmd(msg, len) == UB_LIBCMD_QUIT) {
211 lock_basic_unlock(&ctx->rrpipe_lock);
213 /* if bg worker is a thread, wait for it to exit, so that all
214 * resources are really gone. */
215 lock_basic_lock(&ctx->cfglock);
217 lock_basic_unlock(&ctx->cfglock);
218 ub_thread_join(ctx->bg_tid);
220 lock_basic_unlock(&ctx->cfglock);
224 lock_basic_unlock(&ctx->cfglock);
229 ub_ctx_delete(struct ub_ctx* ctx)
231 struct alloc_cache* a, *na;
235 /* see if bg thread is created and if threads have been killed */
236 /* no locks, because those may be held by terminated threads */
237 /* for processes the read pipe is closed and we see that on read */
239 if(ctx->created_bg && ctx->dothread) {
240 if(pthread_kill(ctx->bg_tid, 0) == ESRCH) {
241 /* thread has been killed */
245 #endif /* HAVE_PTHREAD */
248 libworker_delete_event(ctx->event_worker);
250 modstack_desetup(&ctx->mods, ctx->env);
254 a->super = &ctx->superalloc;
259 local_zones_delete(ctx->local_zones);
260 lock_basic_destroy(&ctx->qqpipe_lock);
261 lock_basic_destroy(&ctx->rrpipe_lock);
262 lock_basic_destroy(&ctx->cfglock);
263 tube_delete(ctx->qq_pipe);
264 tube_delete(ctx->rr_pipe);
266 slabhash_delete(ctx->env->msg_cache);
267 rrset_cache_delete(ctx->env->rrset_cache);
268 infra_delete(ctx->env->infra_cache);
269 config_delete(ctx->env->cfg);
272 ub_randfree(ctx->seed_rnd);
273 alloc_clear(&ctx->superalloc);
274 traverse_postorder(&ctx->queries, delq, NULL);
282 ub_ctx_set_option(struct ub_ctx* ctx, const char* opt, const char* val)
284 lock_basic_lock(&ctx->cfglock);
286 lock_basic_unlock(&ctx->cfglock);
287 return UB_AFTERFINAL;
289 if(!config_set_option(ctx->env->cfg, opt, val)) {
290 lock_basic_unlock(&ctx->cfglock);
293 lock_basic_unlock(&ctx->cfglock);
298 ub_ctx_get_option(struct ub_ctx* ctx, const char* opt, char** str)
301 lock_basic_lock(&ctx->cfglock);
302 r = config_get_option_collate(ctx->env->cfg, opt, str);
303 lock_basic_unlock(&ctx->cfglock);
304 if(r == 0) r = UB_NOERROR;
305 else if(r == 1) r = UB_SYNTAX;
306 else if(r == 2) r = UB_NOMEM;
311 ub_ctx_config(struct ub_ctx* ctx, const char* fname)
313 lock_basic_lock(&ctx->cfglock);
315 lock_basic_unlock(&ctx->cfglock);
316 return UB_AFTERFINAL;
318 if(!config_read(ctx->env->cfg, fname, NULL)) {
319 lock_basic_unlock(&ctx->cfglock);
322 lock_basic_unlock(&ctx->cfglock);
327 ub_ctx_add_ta(struct ub_ctx* ctx, const char* ta)
329 char* dup = strdup(ta);
330 if(!dup) return UB_NOMEM;
331 lock_basic_lock(&ctx->cfglock);
333 lock_basic_unlock(&ctx->cfglock);
335 return UB_AFTERFINAL;
337 if(!cfg_strlist_insert(&ctx->env->cfg->trust_anchor_list, dup)) {
338 lock_basic_unlock(&ctx->cfglock);
342 lock_basic_unlock(&ctx->cfglock);
347 ub_ctx_add_ta_file(struct ub_ctx* ctx, const char* fname)
349 char* dup = strdup(fname);
350 if(!dup) return UB_NOMEM;
351 lock_basic_lock(&ctx->cfglock);
353 lock_basic_unlock(&ctx->cfglock);
355 return UB_AFTERFINAL;
357 if(!cfg_strlist_insert(&ctx->env->cfg->trust_anchor_file_list, dup)) {
358 lock_basic_unlock(&ctx->cfglock);
362 lock_basic_unlock(&ctx->cfglock);
366 int ub_ctx_add_ta_autr(struct ub_ctx* ctx, const char* fname)
368 char* dup = strdup(fname);
369 if(!dup) return UB_NOMEM;
370 lock_basic_lock(&ctx->cfglock);
372 lock_basic_unlock(&ctx->cfglock);
374 return UB_AFTERFINAL;
376 if(!cfg_strlist_insert(&ctx->env->cfg->auto_trust_anchor_file_list,
378 lock_basic_unlock(&ctx->cfglock);
382 lock_basic_unlock(&ctx->cfglock);
387 ub_ctx_trustedkeys(struct ub_ctx* ctx, const char* fname)
389 char* dup = strdup(fname);
390 if(!dup) return UB_NOMEM;
391 lock_basic_lock(&ctx->cfglock);
393 lock_basic_unlock(&ctx->cfglock);
395 return UB_AFTERFINAL;
397 if(!cfg_strlist_insert(&ctx->env->cfg->trusted_keys_file_list, dup)) {
398 lock_basic_unlock(&ctx->cfglock);
402 lock_basic_unlock(&ctx->cfglock);
407 ub_ctx_debuglevel(struct ub_ctx* ctx, int d)
409 lock_basic_lock(&ctx->cfglock);
411 ctx->env->cfg->verbosity = d;
412 lock_basic_unlock(&ctx->cfglock);
416 int ub_ctx_debugout(struct ub_ctx* ctx, void* out)
418 lock_basic_lock(&ctx->cfglock);
419 log_file((FILE*)out);
420 ctx->logfile_override = 1;
422 lock_basic_unlock(&ctx->cfglock);
427 ub_ctx_async(struct ub_ctx* ctx, int dothread)
429 #ifdef THREADS_DISABLED
430 if(dothread) /* cannot do threading */
433 lock_basic_lock(&ctx->cfglock);
435 lock_basic_unlock(&ctx->cfglock);
436 return UB_AFTERFINAL;
438 ctx->dothread = dothread;
439 lock_basic_unlock(&ctx->cfglock);
444 ub_poll(struct ub_ctx* ctx)
446 /* no need to hold lock while testing for readability. */
447 return tube_poll(ctx->rr_pipe);
451 ub_fd(struct ub_ctx* ctx)
453 return tube_read_fd(ctx->rr_pipe);
456 /** process answer from bg worker */
458 process_answer_detail(struct ub_ctx* ctx, uint8_t* msg, uint32_t len,
459 ub_callback_t* cb, void** cbarg, int* err,
460 struct ub_result** res)
463 if(context_serial_getcmd(msg, len) != UB_LIBCMD_ANSWER) {
464 log_err("error: bad data from bg worker %d",
465 (int)context_serial_getcmd(msg, len));
469 lock_basic_lock(&ctx->cfglock);
470 q = context_deserialize_answer(ctx, msg, len, err);
472 lock_basic_unlock(&ctx->cfglock);
473 /* probably simply the lookup that failed, i.e.
474 * response returned before cancel was sent out, so noerror */
477 log_assert(q->async);
479 /* grab cb while locked */
489 ub_resolve_free(q->res);
491 /* parse the message, extract rcode, fill result */
492 sldns_buffer* buf = sldns_buffer_new(q->msg_len);
493 struct regional* region = regional_create();
495 (*res)->rcode = LDNS_RCODE_SERVFAIL;
497 sldns_buffer_clear(buf);
498 sldns_buffer_write(buf, q->msg, q->msg_len);
499 sldns_buffer_flip(buf);
500 libworker_enter_result(*res, buf, region,
503 (*res)->answer_packet = q->msg;
504 (*res)->answer_len = (int)q->msg_len;
506 sldns_buffer_free(buf);
507 regional_destroy(region);
510 /* delete the q from list */
511 (void)rbtree_delete(&ctx->queries, q->node.key);
513 context_query_delete(q);
514 lock_basic_unlock(&ctx->cfglock);
517 ub_resolve_free(*res);
521 /** process answer from bg worker */
523 process_answer(struct ub_ctx* ctx, uint8_t* msg, uint32_t len)
528 struct ub_result* res;
531 r = process_answer_detail(ctx, msg, len, &cb, &cbarg, &err, &res);
533 /* no locks held while calling callback, so that library is
536 (*cb)(cbarg, err, res);
542 ub_process(struct ub_ctx* ctx)
549 lock_basic_lock(&ctx->rrpipe_lock);
550 r = tube_read_msg(ctx->rr_pipe, &msg, &len, 1);
551 lock_basic_unlock(&ctx->rrpipe_lock);
556 if(!process_answer(ctx, msg, len)) {
566 ub_wait(struct ub_ctx* ctx)
571 struct ub_result* res;
575 /* this is basically the same loop as _process(), but with changes.
576 * holds the rrpipe lock and waits with tube_wait */
578 lock_basic_lock(&ctx->rrpipe_lock);
579 lock_basic_lock(&ctx->cfglock);
580 if(ctx->num_async == 0) {
581 lock_basic_unlock(&ctx->cfglock);
582 lock_basic_unlock(&ctx->rrpipe_lock);
585 lock_basic_unlock(&ctx->cfglock);
587 /* keep rrpipe locked, while
588 * o waiting for pipe readable
590 * o possibly decrementing num_async
591 * do callback without lock
593 r = tube_wait(ctx->rr_pipe);
595 r = tube_read_msg(ctx->rr_pipe, &msg, &len, 1);
597 lock_basic_unlock(&ctx->rrpipe_lock);
601 lock_basic_unlock(&ctx->rrpipe_lock);
604 r = process_answer_detail(ctx, msg, len,
605 &cb, &cbarg, &err, &res);
606 lock_basic_unlock(&ctx->rrpipe_lock);
611 (*cb)(cbarg, err, res);
613 lock_basic_unlock(&ctx->rrpipe_lock);
620 ub_resolve(struct ub_ctx* ctx, const char* name, int rrtype,
621 int rrclass, struct ub_result** result)
627 lock_basic_lock(&ctx->cfglock);
628 if(!ctx->finalized) {
629 r = context_finalize(ctx);
631 lock_basic_unlock(&ctx->cfglock);
635 /* create new ctx_query and attempt to add to the list */
636 lock_basic_unlock(&ctx->cfglock);
637 q = context_new(ctx, name, rrtype, rrclass, NULL, NULL);
640 /* become a resolver thread for a bit */
642 r = libworker_fg(ctx, q);
644 lock_basic_lock(&ctx->cfglock);
645 (void)rbtree_delete(&ctx->queries, q->node.key);
646 context_query_delete(q);
647 lock_basic_unlock(&ctx->cfglock);
650 q->res->answer_packet = q->msg;
651 q->res->answer_len = (int)q->msg_len;
656 lock_basic_lock(&ctx->cfglock);
657 (void)rbtree_delete(&ctx->queries, q->node.key);
658 context_query_delete(q);
659 lock_basic_unlock(&ctx->cfglock);
664 ub_resolve_event(struct ub_ctx* ctx, const char* name, int rrtype,
665 int rrclass, void* mydata, ub_event_callback_t callback, int* async_id)
672 lock_basic_lock(&ctx->cfglock);
673 if(!ctx->finalized) {
674 int r = context_finalize(ctx);
676 lock_basic_unlock(&ctx->cfglock);
680 lock_basic_unlock(&ctx->cfglock);
681 if(!ctx->event_worker) {
682 ctx->event_worker = libworker_create_event(ctx,
684 if(!ctx->event_worker) {
689 /* create new ctx_query and attempt to add to the list */
690 q = context_new(ctx, name, rrtype, rrclass, (ub_callback_t)callback,
696 if((r=libworker_attach_mesh(ctx, q, async_id)) != 0)
703 ub_resolve_async(struct ub_ctx* ctx, const char* name, int rrtype,
704 int rrclass, void* mydata, ub_callback_t callback, int* async_id)
712 lock_basic_lock(&ctx->cfglock);
713 if(!ctx->finalized) {
714 int r = context_finalize(ctx);
716 lock_basic_unlock(&ctx->cfglock);
720 if(!ctx->created_bg) {
723 lock_basic_unlock(&ctx->cfglock);
724 r = libworker_bg(ctx);
726 lock_basic_lock(&ctx->cfglock);
728 lock_basic_unlock(&ctx->cfglock);
732 lock_basic_unlock(&ctx->cfglock);
735 /* create new ctx_query and attempt to add to the list */
736 q = context_new(ctx, name, rrtype, rrclass, callback, mydata);
740 /* write over pipe to background worker */
741 lock_basic_lock(&ctx->cfglock);
742 msg = context_serialize_new_query(q, &len);
744 (void)rbtree_delete(&ctx->queries, q->node.key);
746 context_query_delete(q);
747 lock_basic_unlock(&ctx->cfglock);
751 *async_id = q->querynum;
752 lock_basic_unlock(&ctx->cfglock);
754 lock_basic_lock(&ctx->qqpipe_lock);
755 if(!tube_write_msg(ctx->qq_pipe, msg, len, 0)) {
756 lock_basic_unlock(&ctx->qqpipe_lock);
760 lock_basic_unlock(&ctx->qqpipe_lock);
766 ub_cancel(struct ub_ctx* ctx, int async_id)
771 lock_basic_lock(&ctx->cfglock);
772 q = (struct ctx_query*)rbtree_search(&ctx->queries, &async_id);
773 if(!q || !q->async) {
774 /* it is not there, so nothing to do */
775 lock_basic_unlock(&ctx->cfglock);
778 log_assert(q->async);
782 if(!ctx->dothread) { /* if forked */
783 (void)rbtree_delete(&ctx->queries, q->node.key);
785 msg = context_serialize_cancel(q, &len);
786 context_query_delete(q);
787 lock_basic_unlock(&ctx->cfglock);
791 /* send cancel to background worker */
792 lock_basic_lock(&ctx->qqpipe_lock);
793 if(!tube_write_msg(ctx->qq_pipe, msg, len, 0)) {
794 lock_basic_unlock(&ctx->qqpipe_lock);
798 lock_basic_unlock(&ctx->qqpipe_lock);
801 lock_basic_unlock(&ctx->cfglock);
807 ub_resolve_free(struct ub_result* result)
812 if(result->canonname != result->qname)
813 free(result->canonname);
815 for(p = result->data; *p; p++)
819 free(result->answer_packet);
820 free(result->why_bogus);
828 case UB_NOERROR: return "no error";
829 case UB_SOCKET: return "socket io error";
830 case UB_NOMEM: return "out of memory";
831 case UB_SYNTAX: return "syntax error";
832 case UB_SERVFAIL: return "server failure";
833 case UB_FORKFAIL: return "could not fork";
834 case UB_INITFAIL: return "initialization failure";
835 case UB_AFTERFINAL: return "setting change after finalize";
836 case UB_PIPE: return "error in pipe communication with async";
837 case UB_READFILE: return "error reading file";
838 case UB_NOID: return "error async_id does not exist";
839 default: return "unknown error";
844 ub_ctx_set_fwd(struct ub_ctx* ctx, const char* addr)
846 struct sockaddr_storage storage;
848 struct config_stub* s;
850 lock_basic_lock(&ctx->cfglock);
852 lock_basic_unlock(&ctx->cfglock);
854 return UB_AFTERFINAL;
857 /* disable fwd mode - the root stub should be first. */
858 if(ctx->env->cfg->forwards &&
859 strcmp(ctx->env->cfg->forwards->name, ".") == 0) {
860 s = ctx->env->cfg->forwards;
861 ctx->env->cfg->forwards = s->next;
865 lock_basic_unlock(&ctx->cfglock);
868 lock_basic_unlock(&ctx->cfglock);
870 /* check syntax for addr */
871 if(!extstrtoaddr(addr, &storage, &stlen)) {
876 /* it parses, add root stub in front of list */
877 lock_basic_lock(&ctx->cfglock);
878 if(!ctx->env->cfg->forwards ||
879 strcmp(ctx->env->cfg->forwards->name, ".") != 0) {
880 s = calloc(1, sizeof(*s));
882 lock_basic_unlock(&ctx->cfglock);
886 s->name = strdup(".");
889 lock_basic_unlock(&ctx->cfglock);
893 s->next = ctx->env->cfg->forwards;
894 ctx->env->cfg->forwards = s;
896 log_assert(ctx->env->cfg->forwards);
897 s = ctx->env->cfg->forwards;
901 lock_basic_unlock(&ctx->cfglock);
905 if(!cfg_strlist_insert(&s->addrs, dupl)) {
907 lock_basic_unlock(&ctx->cfglock);
911 lock_basic_unlock(&ctx->cfglock);
916 ub_ctx_resolvconf(struct ub_ctx* ctx, const char* fname)
925 #if !defined(UB_ON_WINDOWS) || !defined(HAVE_WINDOWS_H)
926 fname = "/etc/resolv.conf";
929 ULONG buflen = sizeof(*info);
932 info = (FIXED_INFO *) malloc(sizeof (FIXED_INFO));
936 if (GetNetworkParams(info, &buflen) == ERROR_BUFFER_OVERFLOW) {
938 info = (FIXED_INFO *) malloc(buflen);
943 if (GetNetworkParams(info, &buflen) == NO_ERROR) {
945 ptr = &(info->DnsServerList);
948 if((retval=ub_ctx_set_fwd(ctx,
949 ptr->IpAddress.String)!=0)) {
964 in = fopen(fname, "r");
966 /* error in errno! perror(fname) */
969 while(fgets(buf, (int)sizeof(buf), in)) {
970 buf[sizeof(buf)-1] = 0;
972 while(*parse == ' ' || *parse == '\t')
974 if(strncmp(parse, "nameserver", 10) == 0) {
976 parse += 10; /* skip 'nameserver' */
977 /* skip whitespace */
978 while(*parse == ' ' || *parse == '\t')
981 /* skip [0-9a-fA-F.:]*, i.e. IP4 and IP6 address */
982 while(isxdigit((unsigned char)*parse) || *parse=='.' || *parse==':')
984 /* terminate after the address, remove newline */
987 if((r = ub_ctx_set_fwd(ctx, addr)) != UB_NOERROR) {
995 /* from resolv.conf(5) if none given, use localhost */
996 return ub_ctx_set_fwd(ctx, "127.0.0.1");
1002 ub_ctx_hosts(struct ub_ctx* ctx, const char* fname)
1005 char buf[1024], ldata[1024];
1006 char* parse, *addr, *name, *ins;
1007 lock_basic_lock(&ctx->cfglock);
1008 if(ctx->finalized) {
1009 lock_basic_unlock(&ctx->cfglock);
1011 return UB_AFTERFINAL;
1013 lock_basic_unlock(&ctx->cfglock);
1015 #if defined(UB_ON_WINDOWS) && defined(HAVE_WINDOWS_H)
1017 * If this is Windows NT/XP/2K it's in
1018 * %WINDIR%\system32\drivers\etc\hosts.
1019 * If this is Windows 95/98/Me it's in %WINDIR%\hosts.
1021 name = getenv("WINDIR");
1024 snprintf(buf, sizeof(buf), "%s%s", name,
1025 "\\system32\\drivers\\etc\\hosts");
1026 if((retval=ub_ctx_hosts(ctx, buf)) !=0 ) {
1027 snprintf(buf, sizeof(buf), "%s%s", name,
1029 retval=ub_ctx_hosts(ctx, buf);
1036 fname = "/etc/hosts";
1039 in = fopen(fname, "r");
1041 /* error in errno! perror(fname) */
1044 while(fgets(buf, (int)sizeof(buf), in)) {
1045 buf[sizeof(buf)-1] = 0;
1047 while(*parse == ' ' || *parse == '\t')
1050 continue; /* skip comment */
1051 /* format: <addr> spaces <name> spaces <name> ... */
1054 while(isxdigit((unsigned char)*parse) || *parse == '.' || *parse == ':')
1056 if(*parse == '\n' || *parse == 0)
1059 continue; /* ignore macOSX fe80::1%lo0 localhost */
1060 if(*parse != ' ' && *parse != '\t') {
1061 /* must have whitespace after address */
1066 *parse++ = 0; /* end delimiter for addr ... */
1067 /* go to names and add them */
1069 while(*parse == ' ' || *parse == '\t' || *parse=='\n')
1071 if(*parse == 0 || *parse == '#')
1073 /* skip name, allows (too) many printable characters */
1075 while('!' <= *parse && *parse <= '~')
1078 *parse++ = 0; /* end delimiter for name */
1079 snprintf(ldata, sizeof(ldata), "%s %s %s",
1080 name, str_is_ip6(addr)?"AAAA":"A", addr);
1081 ins = strdup(ldata);
1088 lock_basic_lock(&ctx->cfglock);
1089 if(!cfg_strlist_insert(&ctx->env->cfg->local_data,
1091 lock_basic_unlock(&ctx->cfglock);
1097 lock_basic_unlock(&ctx->cfglock);
1104 /** finalize the context, if not already finalized */
1105 static int ub_ctx_finalize(struct ub_ctx* ctx)
1108 lock_basic_lock(&ctx->cfglock);
1109 if (!ctx->finalized) {
1110 res = context_finalize(ctx);
1112 lock_basic_unlock(&ctx->cfglock);
1116 /* Print local zones and RR data */
1117 int ub_ctx_print_local_zones(struct ub_ctx* ctx)
1119 int res = ub_ctx_finalize(ctx);
1120 if (res) return res;
1122 local_zones_print(ctx->local_zones);
1127 /* Add a new zone */
1128 int ub_ctx_zone_add(struct ub_ctx* ctx, const char *zone_name,
1129 const char *zone_type)
1131 enum localzone_type t;
1132 struct local_zone* z;
1137 int res = ub_ctx_finalize(ctx);
1138 if (res) return res;
1140 if(!local_zone_str2type(zone_type, &t)) {
1144 if(!parse_dname(zone_name, &nm, &nmlen, &nmlabs)) {
1148 lock_rw_wrlock(&ctx->local_zones->lock);
1149 if((z=local_zones_find(ctx->local_zones, nm, nmlen, nmlabs,
1150 LDNS_RR_CLASS_IN))) {
1151 /* already present in tree */
1152 lock_rw_wrlock(&z->lock);
1153 z->type = t; /* update type anyway */
1154 lock_rw_unlock(&z->lock);
1155 lock_rw_unlock(&ctx->local_zones->lock);
1159 if(!local_zones_add_zone(ctx->local_zones, nm, nmlen, nmlabs,
1160 LDNS_RR_CLASS_IN, t)) {
1161 lock_rw_unlock(&ctx->local_zones->lock);
1164 lock_rw_unlock(&ctx->local_zones->lock);
1169 int ub_ctx_zone_remove(struct ub_ctx* ctx, const char *zone_name)
1171 struct local_zone* z;
1176 int res = ub_ctx_finalize(ctx);
1177 if (res) return res;
1179 if(!parse_dname(zone_name, &nm, &nmlen, &nmlabs)) {
1183 lock_rw_wrlock(&ctx->local_zones->lock);
1184 if((z=local_zones_find(ctx->local_zones, nm, nmlen, nmlabs,
1185 LDNS_RR_CLASS_IN))) {
1186 /* present in tree */
1187 local_zones_del_zone(ctx->local_zones, z);
1189 lock_rw_unlock(&ctx->local_zones->lock);
1194 /* Add new RR data */
1195 int ub_ctx_data_add(struct ub_ctx* ctx, const char *data)
1197 int res = ub_ctx_finalize(ctx);
1198 if (res) return res;
1200 res = local_zones_add_RR(ctx->local_zones, data);
1201 return (!res) ? UB_NOMEM : UB_NOERROR;
1204 /* Remove RR data */
1205 int ub_ctx_data_remove(struct ub_ctx* ctx, const char *data)
1210 int res = ub_ctx_finalize(ctx);
1211 if (res) return res;
1213 if(!parse_dname(data, &nm, &nmlen, &nmlabs))
1216 local_zones_del_data(ctx->local_zones, nm, nmlen, nmlabs,
1223 const char* ub_version(void)
1225 return PACKAGE_VERSION;
1229 ub_ctx_set_event(struct ub_ctx* ctx, struct event_base* base) {
1230 if (!ctx || !ctx->event_base || !base) {
1233 if (ctx->event_base == base) {
1238 lock_basic_lock(&ctx->cfglock);
1239 /* destroy the current worker - safe to pass in NULL */
1240 libworker_delete_event(ctx->event_worker);
1241 ctx->event_worker = NULL;
1242 ctx->event_base = base;
1243 ctx->created_bg = 0;
1245 lock_basic_unlock(&ctx->cfglock);