resolver.c
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1 /*
2  * resolver.c
3  *
4  * resolver implementation
5  *
6  * a Net::DNS like library for C
7  *
8  * (c) NLnet Labs, 2004-2006
9  *
10  * See the file LICENSE for the license
11  */
12 
13 #include <ldns/config.h>
14 
15 #include <ldns/ldns.h>
16 #include <strings.h>
17 
18 /* Access function for reading
19  * and setting the different Resolver
20  * options */
21 
22 /* read */
23 uint16_t
25 {
26  return r->_port;
27 }
28 
29 ldns_rdf *
31 {
32  return r->_source;
33 }
34 
35 uint16_t
37 {
38  return r->_edns_udp_size;
39 }
40 
41 uint8_t
43 {
44  return r->_retry;
45 }
46 
47 uint8_t
49 {
50  return r->_retrans;
51 }
52 
53 bool
55 {
56  return r->_fallback;
57 }
58 
59 uint8_t
61 {
62  return r->_ip6;
63 }
64 
65 bool
67 {
68  return r->_recursive;
69 }
70 
71 bool
73 {
74  return r->_debug;
75 }
76 
77 bool
79 {
80  return r->_dnsrch;
81 }
82 
83 bool
85 {
86  return r->_fail;
87 }
88 
89 bool
91 {
92  return r->_defnames;
93 }
94 
95 ldns_rdf *
97 {
98  return r->_domain;
99 }
100 
101 ldns_rdf **
103 {
104  return r->_searchlist;
105 }
106 
107 ldns_rdf **
109 {
110  return r->_nameservers;
111 }
112 
113 size_t
115 {
116  return r->_nameserver_count;
117 }
118 
119 bool
121 {
122  return r->_dnssec;
123 }
124 
125 bool
127 {
128  return r->_dnssec_cd;
129 }
130 
131 ldns_rr_list *
133 {
134  return r->_dnssec_anchors;
135 }
136 
137 bool
139 {
140  size_t i;
141  bool result = false;
142 
143  ldns_rr_list * trust_anchors;
144  ldns_rr * cur_rr;
145 
146  if (!r || !keys) { return false; }
147 
148  trust_anchors = ldns_resolver_dnssec_anchors(r);
149 
150  if (!trust_anchors) { return false; }
151 
152  for (i = 0; i < ldns_rr_list_rr_count(keys); i++) {
153 
154  cur_rr = ldns_rr_list_rr(keys, i);
155  if (ldns_rr_list_contains_rr(trust_anchors, cur_rr)) {
156  if (trusted_keys) { ldns_rr_list_push_rr(trusted_keys, cur_rr); }
157  result = true;
158  }
159  }
160 
161  return result;
162 }
163 
164 bool
166 {
167  return r->_igntc;
168 }
169 
170 bool
172 {
173  return r->_usevc;
174 }
175 
176 size_t *
178 {
179  return r->_rtt;
180 }
181 
182 size_t
184 {
185  size_t *rtt;
186 
187  assert(r != NULL);
188 
189  rtt = ldns_resolver_rtt(r);
190 
191  if (pos >= ldns_resolver_nameserver_count(r)) {
192  /* error ?*/
193  return 0;
194  } else {
195  return rtt[pos];
196  }
197 
198 }
199 
200 struct timeval
202 {
203  return r->_timeout;
204 }
205 
206 char *
208 {
209  return r->_tsig_keyname;
210 }
211 
212 char *
214 {
215  return r->_tsig_algorithm;
216 }
217 
218 char *
220 {
221  return r->_tsig_keydata;
222 }
223 
224 bool
226 {
227  return r->_random;
228 }
229 
230 size_t
232 {
233  return r->_searchlist_count;
234 }
235 
236 /* write */
237 void
239 {
240  r->_port = p;
241 }
242 
243 void
245 {
246  r->_source = s;
247 }
248 
249 ldns_rdf *
251 {
252  ldns_rdf **nameservers;
253  ldns_rdf *pop;
254  size_t ns_count;
255  size_t *rtt;
256 
257  assert(r != NULL);
258 
259  ns_count = ldns_resolver_nameserver_count(r);
260  nameservers = ldns_resolver_nameservers(r);
261  rtt = ldns_resolver_rtt(r);
262  if (ns_count == 0 || !nameservers) {
263  return NULL;
264  }
265 
266  pop = nameservers[ns_count - 1];
267 
268  if (ns_count == 1) {
269  LDNS_FREE(nameservers);
270  LDNS_FREE(rtt);
271 
273  ldns_resolver_set_rtt(r, NULL);
274  } else {
275  nameservers = LDNS_XREALLOC(nameservers, ldns_rdf *,
276  (ns_count - 1));
277  rtt = LDNS_XREALLOC(rtt, size_t, (ns_count - 1));
278 
279  ldns_resolver_set_nameservers(r, nameservers);
280  ldns_resolver_set_rtt(r, rtt);
281  }
282  /* decr the count */
284  return pop;
285 }
286 
289 {
290  ldns_rdf **nameservers;
291  size_t ns_count;
292  size_t *rtt;
293 
296  return LDNS_STATUS_ERR;
297  }
298 
299  ns_count = ldns_resolver_nameserver_count(r);
300  nameservers = ldns_resolver_nameservers(r);
301  rtt = ldns_resolver_rtt(r);
302 
303  /* make room for the next one */
304  if (ns_count == 0) {
305  nameservers = LDNS_XMALLOC(ldns_rdf *, 1);
306  } else {
307  nameservers = LDNS_XREALLOC(nameservers, ldns_rdf *, (ns_count + 1));
308  }
309  if(!nameservers)
310  return LDNS_STATUS_MEM_ERR;
311 
312  /* set the new value in the resolver */
313  ldns_resolver_set_nameservers(r, nameservers);
314 
315  /* don't forget the rtt */
316  if (ns_count == 0) {
317  rtt = LDNS_XMALLOC(size_t, 1);
318  } else {
319  rtt = LDNS_XREALLOC(rtt, size_t, (ns_count + 1));
320  }
321  if(!rtt)
322  return LDNS_STATUS_MEM_ERR;
323 
324  /* slide n in its slot. */
325  /* we clone it here, because then we can free the original
326  * rr's where it stood */
327  nameservers[ns_count] = ldns_rdf_clone(n);
328  rtt[ns_count] = LDNS_RESOLV_RTT_MIN;
330  ldns_resolver_set_rtt(r, rtt);
331  return LDNS_STATUS_OK;
332 }
333 
336 {
337  ldns_rdf *address;
338  if ((!rr) || (ldns_rr_get_type(rr) != LDNS_RR_TYPE_A &&
340  return LDNS_STATUS_ERR;
341  }
342  address = ldns_rr_rdf(rr, 0); /* extract the ip number */
343  if (address) {
344  return ldns_resolver_push_nameserver(r, address);
345  } else {
346  return LDNS_STATUS_ERR;
347  }
348 }
349 
352 {
353  ldns_rr *rr;
354  ldns_status stat;
355  size_t i;
356 
357  stat = LDNS_STATUS_OK;
358  if (rrlist) {
359  for(i = 0; i < ldns_rr_list_rr_count(rrlist); i++) {
360  rr = ldns_rr_list_rr(rrlist, i);
362  stat = LDNS_STATUS_ERR;
363  break;
364  }
365  }
366  return stat;
367  } else {
368  return LDNS_STATUS_ERR;
369  }
370 }
371 
372 void
374 {
375  r->_edns_udp_size = s;
376 }
377 
378 void
380 {
381  r->_recursive = re;
382 }
383 
384 void
386 {
387  r->_dnssec = d;
388 }
389 
390 void
392 {
393  r->_dnssec_cd = d;
394 }
395 
396 void
398 {
399  r->_dnssec_anchors = l;
400 }
401 
404 {
405  ldns_rr_list * trust_anchors;
406 
407  if ((!rr) || (ldns_rr_get_type(rr) != LDNS_RR_TYPE_DNSKEY &&
409 
410  return LDNS_STATUS_ERR;
411  }
412 
413  if (!(trust_anchors = ldns_resolver_dnssec_anchors(r))) { /* Initialize */
414  trust_anchors = ldns_rr_list_new();
415  ldns_resolver_set_dnssec_anchors(r, trust_anchors);
416  }
417 
418  return (ldns_rr_list_push_rr(trust_anchors, ldns_rr_clone(rr))) ? LDNS_STATUS_OK : LDNS_STATUS_ERR;
419 }
420 
421 void
423 {
424  r->_igntc = i;
425 }
426 
427 void
429 {
430  r->_usevc = vc;
431 }
432 
433 void
435 {
436  r->_debug = d;
437 }
438 
439 void
441 {
442  r->_ip6 = ip6;
443 }
444 
445 void
447 {
448  r->_fail =f;
449 }
450 
451 static void
452 ldns_resolver_set_searchlist_count(ldns_resolver *r, size_t c)
453 {
454  r->_searchlist_count = c;
455 }
456 
457 void
459 {
460  r->_nameserver_count = c;
461 }
462 
463 void
465 {
466  r->_dnsrch = d;
467 }
468 
469 void
471 {
472  r->_retry = retry;
473 }
474 
475 void
477 {
478  r->_retrans = retrans;
479 }
480 
481 void
483 {
484  r->_fallback = fallback;
485 }
486 
487 void
489 {
490  r->_nameservers = n;
491 }
492 
493 void
495 {
496  r->_defnames = d;
497 }
498 
499 void
501 {
502  r->_rtt = rtt;
503 }
504 
505 void
506 ldns_resolver_set_nameserver_rtt(ldns_resolver *r, size_t pos, size_t value)
507 {
508  size_t *rtt;
509 
510  assert(r != NULL);
511 
512  rtt = ldns_resolver_rtt(r);
513 
514  if (pos >= ldns_resolver_nameserver_count(r)) {
515  /* error ?*/
516  } else {
517  rtt[pos] = value;
518  }
519 
520 }
521 
522 void
524 {
525  size_t c;
526 
529 }
530 
531 void
533 {
534  size_t c;
535 
537  if (c == 0) {
538  return;
539  } else {
541  }
542 }
543 
544 void
546 {
547  r->_domain = d;
548 }
549 
550 void
551 ldns_resolver_set_timeout(ldns_resolver *r, struct timeval timeout)
552 {
553  r->_timeout.tv_sec = timeout.tv_sec;
554  r->_timeout.tv_usec = timeout.tv_usec;
555 }
556 
557 void
559 {
560  ldns_rdf **searchlist;
561  size_t list_count;
562 
564  return;
565  }
566 
567  list_count = ldns_resolver_searchlist_count(r);
568  searchlist = ldns_resolver_searchlist(r);
569 
570  searchlist = LDNS_XREALLOC(searchlist, ldns_rdf *, (list_count + 1));
571  if (searchlist) {
572  r->_searchlist = searchlist;
573 
574  searchlist[list_count] = ldns_rdf_clone(d);
575  ldns_resolver_set_searchlist_count(r, list_count + 1);
576  } /* no way to report mem err */
577 }
578 
579 void
581 {
583  r->_tsig_keyname = strdup(tsig_keyname);
584 }
585 
586 void
588 {
590  r->_tsig_algorithm = strdup(tsig_algorithm);
591 }
592 
593 void
595 {
597  r->_tsig_keydata = strdup(tsig_keydata);
598 }
599 
600 void
602 {
603  r->_random = b;
604 }
605 
606 /* more sophisticated functions */
609 {
610  ldns_resolver *r;
611 
613  if (!r) {
614  return NULL;
615  }
616 
617  r->_searchlist = NULL;
618  r->_nameservers = NULL;
619  r->_rtt = NULL;
620 
621  /* defaults are filled out */
622  ldns_resolver_set_searchlist_count(r, 0);
626  ldns_resolver_set_domain(r, NULL);
627  ldns_resolver_set_defnames(r, false);
631  ldns_resolver_set_fail(r, false);
633  ldns_resolver_set_dnssec(r, false);
634  ldns_resolver_set_dnssec_cd(r, false);
637  ldns_resolver_set_igntc(r, false);
638  ldns_resolver_set_recursive(r, false);
639  ldns_resolver_set_dnsrch(r, true);
640  ldns_resolver_set_source(r, NULL);
641 
642  /* randomize the nameserver to be queried
643  * when there are multiple
644  */
645  ldns_resolver_set_random(r, true);
646 
648 
650  r->_timeout.tv_usec = LDNS_DEFAULT_TIMEOUT_USEC;
651 
652  /* TODO: fd=0 is actually a valid socket (stdin),
653  replace with -1 */
654  r->_socket = 0;
655  r->_axfr_soa_count = 0;
656  r->_axfr_i = 0;
657  r->_cur_axfr_pkt = NULL;
658 
659  r->_tsig_keyname = NULL;
660  r->_tsig_keydata = NULL;
661  r->_tsig_algorithm = NULL;
662  return r;
663 }
664 
667 {
668  return ldns_resolver_new_frm_fp_l(res, fp, NULL);
669 }
670 
672 ldns_resolver_new_frm_fp_l(ldns_resolver **res, FILE *fp, int *line_nr)
673 {
674  ldns_resolver *r;
675  const char *keyword[LDNS_RESOLV_KEYWORDS];
676  char word[LDNS_MAX_LINELEN + 1];
677  int8_t expect;
678  uint8_t i;
679  ldns_rdf *tmp;
680 #ifdef HAVE_SSL
681  ldns_rr *tmp_rr;
682 #endif
683  ssize_t gtr, bgtr;
684  ldns_buffer *b;
685  int lnr = 0, oldline;
686  FILE* myfp = fp;
687  if(!line_nr) line_nr = &lnr;
688 
689  if(!fp) {
690  myfp = fopen("/etc/resolv.conf", "r");
691  if(!myfp)
692  return LDNS_STATUS_FILE_ERR;
693  }
694 
695  /* do this better
696  * expect =
697  * 0: keyword
698  * 1: default domain dname
699  * 2: NS aaaa or a record
700  */
701 
702  /* recognized keywords */
703  keyword[LDNS_RESOLV_NAMESERVER] = "nameserver";
704  keyword[LDNS_RESOLV_DEFDOMAIN] = "domain";
705  keyword[LDNS_RESOLV_SEARCH] = "search";
706  /* these two are read but not used atm TODO */
707  keyword[LDNS_RESOLV_SORTLIST] = "sortlist";
708  keyword[LDNS_RESOLV_OPTIONS] = "options";
709  keyword[LDNS_RESOLV_ANCHOR] = "anchor";
710  expect = LDNS_RESOLV_KEYWORD;
711 
712  r = ldns_resolver_new();
713  if (!r) {
714  if(!fp) fclose(myfp);
715  return LDNS_STATUS_MEM_ERR;
716  }
717 
718  gtr = 1;
719  word[0] = 0;
720  oldline = *line_nr;
721  expect = LDNS_RESOLV_KEYWORD;
722  while (gtr > 0) {
723  /* check comments */
724  if (word[0] == '#') {
725  word[0]='x';
726  if(oldline == *line_nr) {
727  /* skip until end of line */
728  int c;
729  do {
730  c = fgetc(myfp);
731  } while(c != EOF && c != '\n');
732  if(c=='\n') (*line_nr)++;
733  }
734  /* and read next to prepare for further parsing */
735  oldline = *line_nr;
736  continue;
737  }
738  oldline = *line_nr;
739  switch(expect) {
740  case LDNS_RESOLV_KEYWORD:
741  /* keyword */
742  gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
743  if (gtr != 0) {
744  if(word[0] == '#') continue;
745  for(i = 0; i < LDNS_RESOLV_KEYWORDS; i++) {
746  if (strcasecmp(keyword[i], word) == 0) {
747  /* chosen the keyword and
748  * expect values carefully
749  */
750  expect = i;
751  break;
752  }
753  }
754  /* no keyword recognized */
755  if (expect == LDNS_RESOLV_KEYWORD) {
756  /* skip line */
757  /*
758  ldns_resolver_deep_free(r);
759  if(!fp) fclose(myfp);
760  return LDNS_STATUS_SYNTAX_KEYWORD_ERR;
761  */
762  }
763  }
764  break;
766  /* default domain dname */
767  gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
768  if (gtr == 0) {
769  if(!fp) fclose(myfp);
771  }
772  if(word[0] == '#') {
773  expect = LDNS_RESOLV_KEYWORD;
774  continue;
775  }
777  if (!tmp) {
779  if(!fp) fclose(myfp);
781  }
782 
783  /* DOn't free, because we copy the pointer */
784  ldns_resolver_set_domain(r, tmp);
785  expect = LDNS_RESOLV_KEYWORD;
786  break;
788  /* NS aaaa or a record */
789  gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
790  if (gtr == 0) {
791  if(!fp) fclose(myfp);
793  }
794  if(word[0] == '#') {
795  expect = LDNS_RESOLV_KEYWORD;
796  continue;
797  }
798  if(strchr(word, '%')) {
799  /* snip off interface labels,
800  * fe80::222:19ff:fe31:4222%eth0 */
801  strchr(word, '%')[0]=0;
802  }
804  if (!tmp) {
805  /* try ip4 */
807  }
808  /* could not parse it, exit */
809  if (!tmp) {
811  if(!fp) fclose(myfp);
812  return LDNS_STATUS_SYNTAX_ERR;
813  }
814  (void)ldns_resolver_push_nameserver(r, tmp);
815  ldns_rdf_deep_free(tmp);
816  expect = LDNS_RESOLV_KEYWORD;
817  break;
818  case LDNS_RESOLV_SEARCH:
819  /* search list domain dname */
820  gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_SKIP_SPACE, 0, line_nr);
822  if(!b) {
824  if(!fp) fclose(myfp);
825  return LDNS_STATUS_MEM_ERR;
826  }
827 
828  ldns_buffer_new_frm_data(b, word, (size_t) gtr);
829  if(ldns_buffer_status(b) != LDNS_STATUS_OK) {
830  LDNS_FREE(b);
832  if(!fp) fclose(myfp);
833  return LDNS_STATUS_MEM_ERR;
834  }
835  bgtr = ldns_bget_token(b, word, LDNS_PARSE_NORMAL, (size_t) gtr + 1);
836  while (bgtr > 0) {
837  gtr -= bgtr;
838  if(word[0] == '#') {
839  expect = LDNS_RESOLV_KEYWORD;
840  break;
841  }
843  if (!tmp) {
845  ldns_buffer_free(b);
846  if(!fp) fclose(myfp);
848  }
849 
851 
852  ldns_rdf_deep_free(tmp);
853  bgtr = ldns_bget_token(b, word, LDNS_PARSE_NORMAL,
854  (size_t) gtr + 1);
855  }
856  ldns_buffer_free(b);
857  if (expect != LDNS_RESOLV_KEYWORD) {
858  gtr = 1;
859  expect = LDNS_RESOLV_KEYWORD;
860  }
861  break;
863  gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_SKIP_SPACE, 0, line_nr);
864  /* sortlist not implemented atm */
865  expect = LDNS_RESOLV_KEYWORD;
866  break;
867  case LDNS_RESOLV_OPTIONS:
868  gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_SKIP_SPACE, 0, line_nr);
869  /* options not implemented atm */
870  expect = LDNS_RESOLV_KEYWORD;
871  break;
872  case LDNS_RESOLV_ANCHOR:
873  /* a file containing a DNSSEC trust anchor */
874  gtr = ldns_fget_token_l(myfp, word, LDNS_PARSE_NORMAL, 0, line_nr);
875  if (gtr == 0) {
877  if(!fp) fclose(myfp);
879  }
880  if(word[0] == '#') {
881  expect = LDNS_RESOLV_KEYWORD;
882  continue;
883  }
884 
885 #ifdef HAVE_SSL
886  tmp_rr = ldns_read_anchor_file(word);
887  (void) ldns_resolver_push_dnssec_anchor(r, tmp_rr);
888  ldns_rr_free(tmp_rr);
889 #endif
890  expect = LDNS_RESOLV_KEYWORD;
891  break;
892  }
893  }
894 
895  if(!fp)
896  fclose(myfp);
897 
898  if (res) {
899  *res = r;
900  return LDNS_STATUS_OK;
901  } else {
903  return LDNS_STATUS_NULL;
904  }
905 }
906 
908 ldns_resolver_new_frm_file(ldns_resolver **res, const char *filename)
909 {
910  ldns_resolver *r;
911  FILE *fp;
912  ldns_status s;
913 
914  if (!filename) {
915  fp = fopen(LDNS_RESOLV_CONF, "r");
916 
917  } else {
918  fp = fopen(filename, "r");
919  }
920  if (!fp) {
921  return LDNS_STATUS_FILE_ERR;
922  }
923 
924  s = ldns_resolver_new_frm_fp(&r, fp);
925  fclose(fp);
926  if (s == LDNS_STATUS_OK) {
927  if (res) {
928  *res = r;
929  return LDNS_STATUS_OK;
930  } else {
932  return LDNS_STATUS_NULL;
933  }
934  }
935  return s;
936 }
937 
938 void
940 {
941  LDNS_FREE(res);
942 }
943 
944 void
946 {
947  size_t i;
948 
949  if (res) {
950  if (res->_searchlist) {
951  for (i = 0; i < ldns_resolver_searchlist_count(res); i++) {
953  }
954  LDNS_FREE(res->_searchlist);
955  }
956  if (res->_nameservers) {
957  for (i = 0; i < res->_nameserver_count; i++) {
959  }
960  LDNS_FREE(res->_nameservers);
961  }
962  if (ldns_resolver_domain(res)) {
964  }
965  if (res->_tsig_keyname) {
966  LDNS_FREE(res->_tsig_keyname);
967  }
968  if (res->_tsig_keydata) {
969  LDNS_FREE(res->_tsig_keydata);
970  }
971  if (res->_tsig_algorithm) {
973  }
974 
975  if (res->_cur_axfr_pkt) {
977  }
978 
979  if (res->_rtt) {
980  LDNS_FREE(res->_rtt);
981  }
982  if (res->_dnssec_anchors) {
984  }
985  LDNS_FREE(res);
986  }
987 }
988 
991  ldns_resolver *r, const ldns_rdf *name,
992  ldns_rr_type t, ldns_rr_class c, uint16_t flags)
993 {
994  ldns_rdf *new_name;
995  ldns_rdf **search_list;
996  size_t i;
998 
999  if (ldns_dname_absolute(name)) {
1000  /* query as-is */
1001  return ldns_resolver_query_status(pkt, r, name, t, c, flags);
1002  } else if (ldns_resolver_dnsrch(r)) {
1003  search_list = ldns_resolver_searchlist(r);
1004  for (i = 0; i < ldns_resolver_searchlist_count(r); i++) {
1005  new_name = ldns_dname_cat_clone(name, search_list[i]);
1006 
1007  s = ldns_resolver_query_status(pkt, r,
1008  new_name, t, c, flags);
1009  ldns_rdf_free(new_name);
1010  if (pkt) {
1011  if (s == LDNS_STATUS_OK && *pkt &&
1012  ldns_pkt_get_rcode(*pkt) ==
1014  return LDNS_STATUS_OK;
1015  }
1016  ldns_pkt_free(*pkt);
1017  }
1018  }
1019  }
1020  return s;
1021 }
1022 
1023 ldns_pkt *
1025  ldns_rr_type t, ldns_rr_class c, uint16_t flags)
1026 {
1027  ldns_pkt* pkt = NULL;
1029  name, t, c, flags) != LDNS_STATUS_OK) {
1030  ldns_pkt_free(pkt);
1031  }
1032  return pkt;
1033 }
1034 
1037  ldns_resolver *r, const ldns_rdf *name,
1038  ldns_rr_type t, ldns_rr_class c, uint16_t flags)
1039 {
1040  ldns_rdf *newname;
1041  ldns_status status;
1042 
1044  return ldns_resolver_send(pkt, r, name, t, c, flags);
1045  }
1046 
1047  newname = ldns_dname_cat_clone(name, ldns_resolver_domain(r));
1048  if (!newname) {
1049  return LDNS_STATUS_MEM_ERR;
1050  }
1051  status = ldns_resolver_send(pkt, r, newname, t, c, flags);
1052  ldns_rdf_free(newname);
1053  return status;
1054 }
1055 
1056 ldns_pkt *
1058  ldns_rr_type t, ldns_rr_class c, uint16_t flags)
1059 {
1060  ldns_pkt* pkt = NULL;
1062  name, t, c, flags) != LDNS_STATUS_OK) {
1063  ldns_pkt_free(pkt);
1064  }
1065  return pkt;
1066 }
1067 
1068 static size_t *
1069 ldns_resolver_backup_rtt(ldns_resolver *r)
1070 {
1071  size_t *new_rtt;
1072  size_t *old_rtt = ldns_resolver_rtt(r);
1073 
1074  if (old_rtt && ldns_resolver_nameserver_count(r)) {
1075  new_rtt = LDNS_XMALLOC(size_t
1077  memcpy(new_rtt, old_rtt, sizeof(size_t)
1079  ldns_resolver_set_rtt(r, new_rtt);
1080  return old_rtt;
1081  }
1082  return NULL;
1083 }
1084 
1085 static void
1086 ldns_resolver_restore_rtt(ldns_resolver *r, size_t *old_rtt)
1087 {
1088  size_t *cur_rtt = ldns_resolver_rtt(r);
1089 
1090  if (cur_rtt) {
1091  LDNS_FREE(cur_rtt);
1092  }
1093  ldns_resolver_set_rtt(r, old_rtt);
1094 }
1095 
1098  ldns_pkt *query_pkt)
1099 {
1100  ldns_pkt *answer_pkt = NULL;
1101  ldns_status stat = LDNS_STATUS_OK;
1102  size_t *rtt;
1103 
1104  stat = ldns_send(&answer_pkt, (ldns_resolver *)r, query_pkt);
1105  if (stat != LDNS_STATUS_OK) {
1106  if(answer_pkt) {
1107  ldns_pkt_free(answer_pkt);
1108  answer_pkt = NULL;
1109  }
1110  } else {
1111  /* if tc=1 fall back to EDNS and/or TCP */
1112  /* check for tcp first (otherwise we don't care about tc=1) */
1114  if (ldns_pkt_tc(answer_pkt)) {
1115  /* was EDNS0 set? */
1116  if (ldns_pkt_edns_udp_size(query_pkt) == 0) {
1117  ldns_pkt_set_edns_udp_size(query_pkt
1118  , 4096);
1119  ldns_pkt_free(answer_pkt);
1120  /* Nameservers should not become
1121  * unreachable because fragments are
1122  * dropped (network error). We might
1123  * still have success with TCP.
1124  * Therefore maintain reachability
1125  * statuses of the nameservers by
1126  * backup and restore the rtt list.
1127  */
1128  rtt = ldns_resolver_backup_rtt(r);
1129  stat = ldns_send(&answer_pkt, r
1130  , query_pkt);
1131  ldns_resolver_restore_rtt(r, rtt);
1132  }
1133  /* either way, if it is still truncated, use TCP */
1134  if (stat != LDNS_STATUS_OK ||
1135  ldns_pkt_tc(answer_pkt)) {
1136  ldns_resolver_set_usevc(r, true);
1137  ldns_pkt_free(answer_pkt);
1138  stat = ldns_send(&answer_pkt, r, query_pkt);
1139  ldns_resolver_set_usevc(r, false);
1140  }
1141  }
1142  }
1143  }
1144 
1145  if (answer) {
1146  *answer = answer_pkt;
1147  }
1148 
1149  return stat;
1150 }
1151 
1154  const ldns_rdf *name, ldns_rr_type t,
1155  ldns_rr_class c, uint16_t flags)
1156 {
1157  struct timeval now;
1158 
1159  /* prepare a question pkt from the parameters
1160  * and then send this */
1161  if (t == LDNS_RR_TYPE_IXFR) {
1162  *query_pkt = ldns_pkt_ixfr_request_new(ldns_rdf_clone(name),
1163  c, flags, NULL);
1164  } else {
1165  *query_pkt = ldns_pkt_query_new(ldns_rdf_clone(name), t, c, flags);
1166  }
1167  if (!*query_pkt) {
1168  return LDNS_STATUS_ERR;
1169  }
1170 
1171  /* set DO bit if necessary */
1172  if (ldns_resolver_dnssec(r)) {
1173  if (ldns_resolver_edns_udp_size(r) == 0) {
1175  }
1176  ldns_pkt_set_edns_do(*query_pkt, true);
1177  if (ldns_resolver_dnssec_cd(r) || (flags & LDNS_CD)) {
1178  ldns_pkt_set_cd(*query_pkt, true);
1179  }
1180  }
1181 
1182  /* transfer the udp_edns_size from the resolver to the packet */
1183  if (ldns_resolver_edns_udp_size(r) != 0) {
1185  }
1186 
1187  /* set the timestamp */
1188  now.tv_sec = time(NULL);
1189  now.tv_usec = 0;
1190  ldns_pkt_set_timestamp(*query_pkt, now);
1191 
1192 
1193  if (ldns_resolver_debug(r)) {
1194  ldns_pkt_print(stdout, *query_pkt);
1195  }
1196 
1197  /* only set the id if it is not set yet */
1198  if (ldns_pkt_id(*query_pkt) == 0) {
1199  ldns_pkt_set_random_id(*query_pkt);
1200  }
1201 
1202  return LDNS_STATUS_OK;
1203 }
1204 
1205 
1208  ldns_rr_type t, ldns_rr_class c, uint16_t flags)
1209 {
1210  ldns_pkt *query_pkt;
1211  ldns_pkt *answer_pkt;
1212  ldns_status status;
1213 
1214  assert(r != NULL);
1215  assert(name != NULL);
1216 
1217  answer_pkt = NULL;
1218 
1219  /* do all the preprocessing here, then fire of an query to
1220  * the network */
1221 
1222  if (0 == t) {
1223  t= LDNS_RR_TYPE_A;
1224  }
1225  if (0 == c) {
1226  c= LDNS_RR_CLASS_IN;
1227  }
1228  if (0 == ldns_resolver_nameserver_count(r)) {
1229  return LDNS_STATUS_RES_NO_NS;
1230  }
1231  if (ldns_rdf_get_type(name) != LDNS_RDF_TYPE_DNAME) {
1232  return LDNS_STATUS_RES_QUERY;
1233  }
1234 
1235  status = ldns_resolver_prepare_query_pkt(&query_pkt, r, name,
1236  t, c, flags);
1237  if (status != LDNS_STATUS_OK) {
1238  return status;
1239  }
1240 
1241  /* if tsig values are set, tsign it */
1242  /* TODO: make last 3 arguments optional too? maybe make complete
1243  rr instead of separate values in resolver (and packet)
1244  Jelte
1245  should this go in pkt_prepare?
1246  */
1248 #ifdef HAVE_SSL
1249  status = ldns_pkt_tsig_sign(query_pkt,
1252  300, ldns_resolver_tsig_algorithm(r), NULL);
1253  if (status != LDNS_STATUS_OK) {
1254  ldns_pkt_free(query_pkt);
1256  }
1257 #else
1258  ldns_pkt_free(query_pkt);
1260 #endif /* HAVE_SSL */
1261  }
1262 
1263  status = ldns_resolver_send_pkt(&answer_pkt, r, query_pkt);
1264  ldns_pkt_free(query_pkt);
1265 
1266  /* allows answer to be NULL when not interested in return value */
1267  if (answer) {
1268  *answer = answer_pkt;
1269  }
1270  return status;
1271 }
1272 
1273 ldns_rr *
1275 {
1276  ldns_rr *cur_rr;
1277  uint8_t *packet_wire;
1278  size_t packet_wire_size;
1279  ldns_lookup_table *rcode;
1280  ldns_status status;
1281 
1282  /* check if start() has been called */
1283  if (!resolver || resolver->_socket == 0) {
1284  return NULL;
1285  }
1286 
1287  if (resolver->_cur_axfr_pkt) {
1288  if (resolver->_axfr_i == ldns_pkt_ancount(resolver->_cur_axfr_pkt)) {
1289  ldns_pkt_free(resolver->_cur_axfr_pkt);
1290  resolver->_cur_axfr_pkt = NULL;
1291  return ldns_axfr_next(resolver);
1292  }
1293  cur_rr = ldns_rr_clone(ldns_rr_list_rr(
1294  ldns_pkt_answer(resolver->_cur_axfr_pkt),
1295  resolver->_axfr_i));
1296  resolver->_axfr_i++;
1297  if (ldns_rr_get_type(cur_rr) == LDNS_RR_TYPE_SOA) {
1298  resolver->_axfr_soa_count++;
1299  if (resolver->_axfr_soa_count >= 2) {
1300 #ifndef USE_WINSOCK
1301  close(resolver->_socket);
1302 #else
1303  closesocket(resolver->_socket);
1304 #endif
1305  resolver->_socket = 0;
1306  ldns_pkt_free(resolver->_cur_axfr_pkt);
1307  resolver->_cur_axfr_pkt = NULL;
1308  }
1309  }
1310  return cur_rr;
1311  } else {
1312  packet_wire = ldns_tcp_read_wire(resolver->_socket, &packet_wire_size);
1313  if(!packet_wire)
1314  return NULL;
1315 
1316  status = ldns_wire2pkt(&resolver->_cur_axfr_pkt, packet_wire,
1317  packet_wire_size);
1318  LDNS_FREE(packet_wire);
1319 
1320  resolver->_axfr_i = 0;
1321  if (status != LDNS_STATUS_OK) {
1322  /* TODO: make status return type of this function (...api change) */
1323 #ifdef STDERR_MSGS
1324  fprintf(stderr, "Error parsing rr during AXFR: %s\n", ldns_get_errorstr_by_id(status));
1325 #endif
1326 
1327  /* we must now also close the socket, otherwise subsequent uses of the
1328  same resolver structure will fail because the link is still open or
1329  in an undefined state */
1330 #ifndef USE_WINSOCK
1331  close(resolver->_socket);
1332 #else
1333  closesocket(resolver->_socket);
1334 #endif
1335  resolver->_socket = 0;
1336 
1337  return NULL;
1338  } else if (ldns_pkt_get_rcode(resolver->_cur_axfr_pkt) != 0) {
1340 #ifdef STDERR_MSGS
1341  if (rcode) {
1342  fprintf(stderr, "Error in AXFR: %s\n",
1343  rcode->name);
1344  } else {
1345  fprintf(stderr, "Error in AXFR: %d\n",
1346  (int) ldns_pkt_get_rcode(
1347  resolver->_cur_axfr_pkt));
1348  }
1349 #endif
1350 
1351  /* we must now also close the socket, otherwise subsequent uses of the
1352  same resolver structure will fail because the link is still open or
1353  in an undefined state */
1354 #ifndef USE_WINSOCK
1355  close(resolver->_socket);
1356 #else
1357  closesocket(resolver->_socket);
1358 #endif
1359  resolver->_socket = 0;
1360 
1361  return NULL;
1362  } else {
1363  return ldns_axfr_next(resolver);
1364  }
1365 
1366  }
1367 
1368 }
1369 
1370 /* this function is needed to abort a transfer that is in progress;
1371  * without it an aborted transfer will lead to the AXFR code in the
1372  * library staying in an indetermined state because the socket for the
1373  * AXFR is never closed
1374  */
1375 void
1377 {
1378  /* Only abort if an actual AXFR is in progress */
1379  if (resolver->_socket != 0)
1380  {
1381 #ifndef USE_WINSOCK
1382  close(resolver->_socket);
1383 #else
1384  closesocket(resolver->_socket);
1385 #endif
1386  resolver->_socket = 0;
1387  }
1388 }
1389 
1390 bool
1392 {
1393  /* complete when soa count is 2? */
1394  return res->_axfr_soa_count == 2;
1395 }
1396 
1397 ldns_pkt *
1399 {
1400  return res->_cur_axfr_pkt;
1401 }
1402 
1403 /* random isn't really that good */
1404 void
1406 {
1407  uint16_t i, j;
1408  ldns_rdf **ns, *tmpns;
1409  size_t *rtt, tmprtt;
1410 
1411  /* should I check for ldns_resolver_random?? */
1412  assert(r != NULL);
1413 
1414  ns = ldns_resolver_nameservers(r);
1415  rtt = ldns_resolver_rtt(r);
1416  for (i = 0; i < ldns_resolver_nameserver_count(r); i++) {
1418  tmpns = ns[i];
1419  ns[i] = ns[j];
1420  ns[j] = tmpns;
1421  tmprtt = rtt[i];
1422  rtt[i] = rtt[j];
1423  rtt[j] = tmprtt;
1424  }
1426 }
1427 
ldns_rdf * ldns_rr_rdf(const ldns_rr *rr, size_t nr)
returns the rdata field member counter.
Definition: rr.c:873
uint8_t ldns_resolver_ip6(const ldns_resolver *r)
Does the resolver use ip6 or ip4.
Definition: resolver.c:60
implementation of buffers to ease operations
Definition: buffer.h:50
void ldns_resolver_free(ldns_resolver *res)
Frees the allocated space for this resolver.
Definition: resolver.c:939
void ldns_resolver_set_domain(ldns_resolver *r, ldns_rdf *d)
Set the resolver&#39;s default domain.
Definition: resolver.c:545
void ldns_resolver_set_source(ldns_resolver *r, ldns_rdf *s)
Set the source rdf (address) the resolver should use.
Definition: resolver.c:244
#define LDNS_PARSE_NORMAL
Definition: parse.h:21
bool ldns_resolver_dnsrch(const ldns_resolver *r)
Does the resolver apply search list.
Definition: resolver.c:78
ldns_rr * ldns_rr_clone(const ldns_rr *rr)
clones a rr and all its data
Definition: rr.c:1363
char * ldns_resolver_tsig_algorithm(const ldns_resolver *r)
Return the tsig algorithm as used by the nameserver.
Definition: resolver.c:213
uint8_t ldns_resolver_retry(const ldns_resolver *r)
Get the number of retries.
Definition: resolver.c:42
void ldns_rdf_deep_free(ldns_rdf *rd)
frees a rdf structure and frees the data.
Definition: rdata.c:230
a host address
Definition: rr.h:83
ldns_status ldns_resolver_search_status(ldns_pkt **pkt, ldns_resolver *r, const ldns_rdf *name, ldns_rr_type t, ldns_rr_class c, uint16_t flags)
Send the query for using the resolver and take the search list into account The search algorithm is a...
Definition: resolver.c:990
ldns_status ldns_resolver_prepare_query_pkt(ldns_pkt **query_pkt, ldns_resolver *r, const ldns_rdf *name, ldns_rr_type t, ldns_rr_class c, uint16_t flags)
Form a query packet from a resolver and name/type/class combo.
Definition: resolver.c:1153
ldns_rr_list * _dnssec_anchors
Optional trust anchors for complete DNSSEC validation.
Definition: resolver.h:99
DNS stub resolver structure.
Definition: resolver.h:59
signed char _fail
Only try the first nameserver, and return with an error directly if it fails.
Definition: resolver.h:113
uint16_t _port
Port to send queries to.
Definition: resolver.h:62
enum ldns_enum_rr_class ldns_rr_class
Definition: rr.h:64
bool ldns_rr_list_push_rr(ldns_rr_list *rr_list, const ldns_rr *rr)
pushes an rr to an rrlist.
Definition: rr.c:1096
ldns_pkt * ldns_resolver_query(const ldns_resolver *r, const ldns_rdf *name, ldns_rr_type t, ldns_rr_class c, uint16_t flags)
Send a query to a nameserver.
Definition: resolver.c:1057
size_t ldns_resolver_searchlist_count(const ldns_resolver *r)
Return the resolver&#39;s searchlist count.
Definition: resolver.c:231
bool ldns_rr_list_contains_rr(const ldns_rr_list *rr_list, ldns_rr *rr)
returns true if the given rr is one of the rrs in the list, or if it is equal to one ...
Definition: rr.c:1203
List or Set of Resource Records.
Definition: rr.h:327
void ldns_resolver_set_rtt(ldns_resolver *r, size_t *rtt)
Set round trip time for all nameservers.
Definition: resolver.c:500
size_t _searchlist_count
Number of entries in the searchlist array.
Definition: resolver.h:85
bool ldns_pkt_tc(const ldns_pkt *packet)
Read the packet&#39;s tc bit.
Definition: packet.c:57
ldns_pkt_rcode ldns_pkt_get_rcode(const ldns_pkt *packet)
Return the packet&#39;s respons code.
Definition: packet.c:93
uint8_t _retrans
Time to wait before retrying.
Definition: resolver.h:90
void ldns_resolver_deep_free(ldns_resolver *res)
Frees the allocated space for this resolver and all it&#39;s data.
Definition: resolver.c:945
signed char _dnssec
Whether to do DNSSEC.
Definition: resolver.h:95
#define LDNS_RESOLV_DEFDOMAIN
Definition: resolver.h:41
bool ldns_resolver_dnssec(const ldns_resolver *r)
Does the resolver do DNSSEC.
Definition: resolver.c:120
#define LDNS_RESOLV_SEARCH
Definition: resolver.h:43
ldns_status ldns_resolver_push_nameserver_rr_list(ldns_resolver *r, ldns_rr_list *rrlist)
Push a new nameserver rr_list to the resolver.
Definition: resolver.c:351
void ldns_resolver_set_nameserver_rtt(ldns_resolver *r, size_t pos, size_t value)
Set round trip time for a specific nameserver.
Definition: resolver.c:506
uint16_t ldns_pkt_id(const ldns_pkt *packet)
Read the packet id.
Definition: packet.c:39
void ldns_resolver_set_tsig_keyname(ldns_resolver *r, char *tsig_keyname)
Set the tsig key name.
Definition: resolver.c:580
#define LDNS_XMALLOC(type, count)
Definition: util.h:51
void ldns_resolver_set_nameservers(ldns_resolver *r, ldns_rdf **n)
Set the resolver&#39;s nameserver count directly by using an rdf list.
Definition: resolver.c:488
void ldns_resolver_push_searchlist(ldns_resolver *r, ldns_rdf *d)
Push a new rd to the resolver&#39;s searchlist.
Definition: resolver.c:558
#define LDNS_RESOLV_KEYWORDS
Definition: resolver.h:47
ldns_lookup_table ldns_rcodes[]
Response codes.
Definition: host2str.c:92
#define LDNS_RESOLV_ANCHOR
Definition: resolver.h:46
void ldns_rr_list_deep_free(ldns_rr_list *rr_list)
frees an rr_list structure and all rrs contained therein.
Definition: rr.c:984
void ldns_buffer_free(ldns_buffer *buffer)
frees the buffer.
Definition: buffer.c:137
#define LDNS_RESOLV_NAMESERVER
Definition: resolver.h:42
ldns_rdf * ldns_rdf_clone(const ldns_rdf *rd)
clones a rdf structure.
Definition: rdata.c:222
uint16_t _edns_udp_size
Definition: resolver.h:130
#define LDNS_CD
Definition: packet.h:31
void ldns_resolver_set_tsig_algorithm(ldns_resolver *r, char *tsig_algorithm)
Set the tsig algorithm.
Definition: resolver.c:587
size_t * _rtt
Round trip time; 0 -> infinity.
Definition: resolver.h:70
void ldns_rr_free(ldns_rr *rr)
frees an RR structure
Definition: rr.c:75
void ldns_resolver_set_timeout(ldns_resolver *r, struct timeval timeout)
Set the resolver&#39;s socket time out when talking to remote hosts.
Definition: resolver.c:551
ssize_t ldns_bget_token(ldns_buffer *b, char *token, const char *delim, size_t limit)
returns a token/char from the buffer b.
Definition: parse.c:217
uint16_t ldns_resolver_port(const ldns_resolver *r)
Get the port the resolver should use.
Definition: resolver.c:24
ldns_rdf ** ldns_resolver_searchlist(const ldns_resolver *r)
What is the searchlist as used by the resolver.
Definition: resolver.c:102
ldns_status ldns_resolver_push_dnssec_anchor(ldns_resolver *r, ldns_rr *rr)
Push a new trust anchor to the resolver.
Definition: resolver.c:403
ldns_rr_list * ldns_resolver_dnssec_anchors(const ldns_resolver *r)
Get the resolver&#39;s DNSSEC anchors.
Definition: resolver.c:132
void ldns_pkt_set_edns_udp_size(ldns_pkt *packet, uint16_t s)
Set the packet&#39;s edns udp size.
Definition: packet.c:591
ldns_pkt * ldns_pkt_query_new(ldns_rdf *rr_name, ldns_rr_type rr_type, ldns_rr_class rr_class, uint16_t flags)
creates a packet with a query in it for the given name, type and class.
Definition: packet.c:1034
bool ldns_resolver_dnssec_cd(const ldns_resolver *r)
Does the resolver set the CD bit.
Definition: resolver.c:126
ldns_pkt * ldns_axfr_last_pkt(const ldns_resolver *res)
Returns a pointer to the last ldns_pkt that was sent by the server in the AXFR transfer uasable for i...
Definition: resolver.c:1398
#define LDNS_XREALLOC(ptr, type, count)
Definition: util.h:57
bool ldns_resolver_igntc(const ldns_resolver *r)
Does the resolver ignore the TC bit (truncated)
Definition: resolver.c:165
void ldns_resolver_set_igntc(ldns_resolver *r, bool i)
Definition: resolver.c:422
signed char _usevc
Whether to use tcp or udp (tcp if the value is true)
Definition: resolver.h:101
bool ldns_axfr_complete(const ldns_resolver *res)
Returns true if the axfr transfer has completed (i.e.
Definition: resolver.c:1391
size_t ldns_resolver_nameserver_rtt(const ldns_resolver *r, size_t pos)
Return the used round trip time for a specific nameserver.
Definition: resolver.c:183
#define LDNS_RESOLV_RTT_MIN
Definition: resolver.h:54
Resource Record.
Definition: rr.h:299
void ldns_rdf_free(ldns_rdf *rd)
frees a rdf structure, leaving the data pointer intact.
Definition: rdata.c:241
char * _tsig_algorithm
TSIG signing algorithm.
Definition: resolver.h:140
ldns_status ldns_send(ldns_pkt **result_packet, ldns_resolver *r, const ldns_pkt *query_pkt)
Sends ptk to the nameserver at the resolver object.
Definition: net.c:35
void ldns_resolver_set_dnssec(ldns_resolver *r, bool d)
Definition: resolver.c:385
bool ldns_resolver_defnames(const ldns_resolver *r)
Does the resolver apply default domain name.
Definition: resolver.c:90
Including this file will include all ldns files, and define some lookup tables.
ipv6 address
Definition: rr.h:137
bool ldns_resolver_fallback(const ldns_resolver *r)
Get the truncation fallback status.
Definition: resolver.c:54
marks the start of a zone of authority
Definition: rr.h:93
size_t _nameserver_count
Number of nameservers in _nameservers.
Definition: resolver.h:67
uint16_t ldns_get_random(void)
Get random number.
Definition: util.c:400
uint8_t _retry
Number of times to retry before giving up.
Definition: resolver.h:88
void ldns_resolver_set_recursive(ldns_resolver *r, bool re)
Definition: resolver.c:379
signed char _debug
Print debug information.
Definition: resolver.h:76
ldns_rr * ldns_rr_list_rr(const ldns_rr_list *rr_list, size_t nr)
returns a specific rr of an rrlist.
Definition: rr.c:954
void ldns_resolver_set_defnames(ldns_resolver *r, bool d)
Definition: resolver.c:494
#define LDNS_RESOLV_CONF
Default location of the resolv.conf file.
Definition: resolver.h:36
ldns_rr * ldns_axfr_next(ldns_resolver *resolver)
Get the next stream of RRs in a AXFR.
Definition: resolver.c:1274
bool ldns_resolver_trusted_key(const ldns_resolver *r, ldns_rr_list *keys, ldns_rr_list *trusted_keys)
Returns true if at least one of the provided keys is a trust anchor.
Definition: resolver.c:138
ldns_rr * ldns_read_anchor_file(const char *filename)
Instantiates a DNSKEY or DS RR from file.
Definition: keys.c:1605
ldns_status ldns_wire2pkt(ldns_pkt **packet_p, const uint8_t *wire, size_t max)
converts the data on the uint8_t bytearray (in wire format) to a DNS packet.
Definition: wire2host.c:401
ldns_status ldns_resolver_query_status(ldns_pkt **pkt, ldns_resolver *r, const ldns_rdf *name, ldns_rr_type t, ldns_rr_class c, uint16_t flags)
Send a query to a nameserver.
Definition: resolver.c:1036
void ldns_resolver_nameservers_randomize(ldns_resolver *r)
Randomize the nameserver list in the resolver.
Definition: resolver.c:1405
void ldns_resolver_set_nameserver_count(ldns_resolver *r, size_t c)
Set the resolver&#39;s nameserver count directly.
Definition: resolver.c:458
void ldns_resolver_set_fallback(ldns_resolver *r, bool fallback)
Definition: resolver.c:482
uint16_t ldns_pkt_ancount(const ldns_pkt *packet)
Return the packet&#39;s an count.
Definition: packet.c:105
bool ldns_resolver_usevc(const ldns_resolver *r)
Does the resolver use tcp or udp.
Definition: resolver.c:171
ldns_pkt * ldns_resolver_search(const ldns_resolver *r, const ldns_rdf *name, ldns_rr_type t, ldns_rr_class c, uint16_t flags)
Send the query for using the resolver and take the search list into account The search algorithm is a...
Definition: resolver.c:1024
size_t ldns_resolver_nameserver_count(const ldns_resolver *r)
How many nameserver are configured in the resolver.
Definition: resolver.c:114
ldns_status ldns_resolver_send(ldns_pkt **answer, ldns_resolver *r, const ldns_rdf *name, ldns_rr_type t, ldns_rr_class c, uint16_t flags)
Send the query for name as-is.
Definition: resolver.c:1207
int _axfr_soa_count
Count the number of LDNS_RR_TYPE_SOA RRs we have seen so far (the second one signifies the end of the...
Definition: resolver.h:121
A record.
Definition: rdata.h:58
ldns_rr_list * ldns_rr_list_new(void)
creates a new rr_list structure.
Definition: rr.c:964
uint16_t ldns_resolver_edns_udp_size(const ldns_resolver *r)
Get the resolver&#39;s udp size.
Definition: resolver.c:36
void ldns_resolver_incr_nameserver_count(ldns_resolver *r)
Incremental the resolver&#39;s nameserver count.
Definition: resolver.c:523
void ldns_resolver_set_random(ldns_resolver *r, bool b)
Definition: resolver.c:601
#define LDNS_DEFAULT_TIMEOUT_SEC
Definition: net.h:23
ldns_lookup_table * ldns_lookup_by_id(ldns_lookup_table *table, int id)
Definition: util.c:41
#define LDNS_RESOLV_SORTLIST
Definition: resolver.h:44
ldns_pkt * _cur_axfr_pkt
Packet currently handled when doing part of an AXFR.
Definition: resolver.h:126
the Internet
Definition: rr.h:50
AAAA record.
Definition: rdata.h:60
struct timeval _timeout
Timeout for socket connections.
Definition: resolver.h:111
ldns_rdf ** _nameservers
Array of nameservers to query (IP addresses or dnames)
Definition: resolver.h:65
#define LDNS_RESOLV_KEYWORD
Definition: resolver.h:40
ldns_rdf * ldns_rdf_new_frm_str(ldns_rdf_type type, const char *str)
creates a new rdf from a string.
Definition: rdata.c:249
ldns_rdf * ldns_dname_cat_clone(const ldns_rdf *rd1, const ldns_rdf *rd2)
concatenates two dnames together
Definition: dname.c:52
void ldns_resolver_set_fail(ldns_resolver *r, bool f)
Definition: resolver.c:446
RFC4034, RFC3658.
Definition: rr.h:167
uint16_t _axfr_i
Counter for within the AXFR packets.
Definition: resolver.h:128
ldns_resolver * ldns_resolver_new(void)
Create a new resolver structure.
Definition: resolver.c:608
bool ldns_resolver_debug(const ldns_resolver *r)
Get the debug status of the resolver.
Definition: resolver.c:72
signed char _recursive
Wether or not to be recursive.
Definition: resolver.h:73
signed char _defnames
If true append the default domain.
Definition: resolver.h:107
ssize_t ldns_fget_token_l(FILE *f, char *token, const char *delim, size_t limit, int *line_nr)
returns a token/char from the stream F.
Definition: parse.c:31
#define LDNS_PORT
Definition: ldns.h:133
ldns_status ldns_resolver_push_nameserver_rr(ldns_resolver *r, ldns_rr *rr)
Push a new nameserver to the resolver.
Definition: resolver.c:335
ldns_rdf_type ldns_rdf_get_type(const ldns_rdf *rd)
returns the type of the rdf.
Definition: rdata.c:31
DNS packet.
Definition: packet.h:233
ldns_pkt * ldns_pkt_ixfr_request_new(ldns_rdf *rr_name, ldns_rr_class rr_class, uint16_t flags, ldns_rr *soa)
creates an IXFR request packet for the given name, type and class.
Definition: packet.c:1042
void ldns_resolver_set_port(ldns_resolver *r, uint16_t p)
Set the port the resolver should use.
Definition: resolver.c:238
void ldns_pkt_set_edns_do(ldns_pkt *packet, bool value)
Definition: packet.c:236
char * _tsig_keyname
Name of the key to use with TSIG, if _tsig_keyname and _tsig_keydata both contain values...
Definition: resolver.h:136
char * ldns_resolver_tsig_keydata(const ldns_resolver *r)
Return the tsig keydata as used by the nameserver.
Definition: resolver.c:219
ldns_rr_type ldns_rr_get_type(const ldns_rr *rr)
returns the type of the rr.
Definition: rr.c:907
uint8_t * ldns_tcp_read_wire(int sockfd, size_t *size)
This routine may block.
Definition: net.c:780
bool ldns_resolver_random(const ldns_resolver *r)
Does the resolver randomize the nameserver before usage.
Definition: resolver.c:225
ldns_rdf * _domain
Default domain to add to non fully qualified domain names.
Definition: resolver.h:79
const char * name
Definition: util.h:158
enum ldns_enum_status ldns_status
Definition: error.h:131
ldns_status ldns_resolver_new_frm_file(ldns_resolver **res, const char *filename)
Configure a resolver by means of a resolv.conf file The file may be NULL in which case there will be ...
Definition: resolver.c:908
void ldns_pkt_set_cd(ldns_pkt *packet, bool cd)
Definition: packet.c:512
#define LDNS_MALLOC(type)
Memory management macros.
Definition: util.h:49
ldns_status ldns_resolver_new_frm_fp_l(ldns_resolver **res, FILE *fp, int *line_nr)
Create a resolver structure from a file like /etc/resolv.conf.
Definition: resolver.c:672
A general purpose lookup table.
Definition: util.h:156
uint8_t ldns_resolver_retrans(const ldns_resolver *r)
Get the retransmit interval.
Definition: resolver.c:48
signed char _igntc
Whether to ignore the tc bit.
Definition: resolver.h:103
ldns_status ldns_pkt_tsig_sign(ldns_pkt *pkt, const char *key_name, const char *key_data, uint16_t fudge, const char *algorithm_name, ldns_rdf *query_mac)
creates a tsig rr for the given packet and key.
Definition: tsig.c:352
#define LDNS_PARSE_SKIP_SPACE
Definition: parse.h:20
ldns_rdf * ldns_resolver_pop_nameserver(ldns_resolver *r)
pop the last nameserver from the resolver.
Definition: resolver.c:250
void ldns_resolver_set_debug(ldns_resolver *r, bool d)
Definition: resolver.c:434
size_t * ldns_resolver_rtt(const ldns_resolver *r)
Return the used round trip times for the nameservers.
Definition: resolver.c:177
uint16_t ldns_pkt_edns_udp_size(const ldns_pkt *packet)
return the packet&#39;s edns udp size
Definition: packet.c:206
void ldns_resolver_set_usevc(ldns_resolver *r, bool vc)
Definition: resolver.c:428
bool ldns_resolver_fail(const ldns_resolver *r)
Does the resolver only try the first nameserver.
Definition: resolver.c:84
ldns_rdf * ldns_resolver_source(const ldns_resolver *r)
Get the source address the resolver should use.
Definition: resolver.c:30
ldns_rdf ** _searchlist
Searchlist array, add the names in this array if a query cannot be found.
Definition: resolver.h:82
#define LDNS_RESOLV_OPTIONS
Definition: resolver.h:45
void ldns_resolver_set_edns_udp_size(ldns_resolver *r, uint16_t s)
Set maximum udp size.
Definition: resolver.c:373
signed char _dnssec_cd
Whether to set the CD bit on DNSSEC requests.
Definition: resolver.h:97
signed char _random
Randomly choose a nameserver.
Definition: resolver.h:115
ldns_rdf * _source
Source address to query from.
Definition: resolver.h:143
void ldns_pkt_print(FILE *output, const ldns_pkt *pkt)
Prints the data in the DNS packet to the given file stream (in presentation format) ...
Definition: host2str.c:2533
ldns_status ldns_resolver_push_nameserver(ldns_resolver *r, ldns_rdf *n)
Push a new nameserver to the resolver.
Definition: resolver.c:288
ldns_rdf ** ldns_resolver_nameservers(const ldns_resolver *r)
Return the configured nameserver ip address.
Definition: resolver.c:108
ldns_status ldns_resolver_send_pkt(ldns_pkt **answer, ldns_resolver *r, ldns_pkt *query_pkt)
Send the given packet to a nameserver.
Definition: resolver.c:1097
char * ldns_resolver_tsig_keyname(const ldns_resolver *r)
Return the tsig keyname as used by the nameserver.
Definition: resolver.c:207
#define LDNS_MAX_LINELEN
Definition: parse.h:23
Resource record data field.
Definition: rdata.h:166
uint8_t _ip6
Whether to use ip6, 0->does not matter, 1 is IPv4, 2 is IPv6.
Definition: resolver.h:105
void ldns_resolver_set_retry(ldns_resolver *r, uint8_t retry)
Set the number of times a resolver should retry a nameserver before the next one is tried...
Definition: resolver.c:470
#define LDNS_RESOLV_INETANY
Definition: resolver.h:49
size_t ldns_rr_list_rr_count(const ldns_rr_list *rr_list)
returns the number of rr&#39;s in an rr_list.
Definition: rr.c:921
void ldns_resolver_set_dnssec_anchors(ldns_resolver *r, ldns_rr_list *l)
Set the resolver&#39;s DNSSEC anchor list directly.
Definition: resolver.c:397
enum ldns_enum_rr_type ldns_rr_type
Definition: rr.h:236
void ldns_resolver_set_retrans(ldns_resolver *r, uint8_t retrans)
Set the resolver retrans timeout (in seconds)
Definition: resolver.c:476
#define LDNS_FREE(ptr)
Definition: util.h:60
signed char _dnsrch
If true apply the search list.
Definition: resolver.h:109
bool ldns_resolver_recursive(const ldns_resolver *r)
Is the resolver set to recurse.
Definition: resolver.c:66
void ldns_pkt_set_random_id(ldns_pkt *packet)
Set the packet&#39;s id to a random value.
Definition: packet.c:456
void ldns_resolver_set_ip6(ldns_resolver *r, uint8_t ip6)
Whether the resolver uses ip6.
Definition: resolver.c:440
bool ldns_dname_absolute(const ldns_rdf *rdf)
Checks whether the given dname is absolute (i.e.
Definition: dname.c:544
void ldns_resolver_set_dnssec_cd(ldns_resolver *r, bool d)
Definition: resolver.c:391
const char * ldns_get_errorstr_by_id(ldns_status err)
look up a descriptive text by each error.
Definition: error.c:150
ldns_status ldns_resolver_new_frm_fp(ldns_resolver **res, FILE *fp)
Create a resolver structure from a file like /etc/resolv.conf.
Definition: resolver.c:666
int _socket
Keep some things to make AXFR possible.
Definition: resolver.h:117
domain name
Definition: rdata.h:50
void ldns_axfr_abort(ldns_resolver *resolver)
Definition: resolver.c:1376
void ldns_resolver_set_dnsrch(ldns_resolver *r, bool d)
Definition: resolver.c:464
void ldns_buffer_new_frm_data(ldns_buffer *buffer, void *data, size_t size)
creates a buffer with the specified data.
Definition: buffer.c:41
ldns_rr_list * ldns_pkt_answer(const ldns_pkt *packet)
Return the packet&#39;s answer section.
Definition: packet.c:129
void ldns_resolver_set_tsig_keydata(ldns_resolver *r, char *tsig_keydata)
Set the tsig key data.
Definition: resolver.c:594
char * _tsig_keydata
Secret key data to use with TSIG, if _tsig_keyname and _tsig_keydata both contain values...
Definition: resolver.h:138
void ldns_pkt_free(ldns_pkt *packet)
frees the packet structure and all data that it contains.
Definition: packet.c:784
#define LDNS_DEFAULT_TIMEOUT_USEC
Definition: net.h:24
void ldns_resolver_dec_nameserver_count(ldns_resolver *r)
Decrement the resolver&#39;s nameserver count.
Definition: resolver.c:532
ldns_rdf * ldns_resolver_domain(const ldns_resolver *r)
What is the default dname to add to relative queries.
Definition: resolver.c:96
struct timeval ldns_resolver_timeout(const ldns_resolver *r)
What is the timeout on socket connections.
Definition: resolver.c:201
signed char _fallback
Use new fallback mechanism (try EDNS, then do TCP)
Definition: resolver.h:92
void ldns_pkt_set_timestamp(ldns_pkt *packet, struct timeval timeval)
Set the packet&#39;s timestamp.
Definition: packet.c:578