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3 (C) 2011-2013 Christian Grothoff (and other contributing authors)
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22 * @file gns/gnunet-service-gns_resolver.c
23 * @brief GNU Name System resolver logic
24 * @author Martin Schanzenbach
25 * @author Christian Grothoff
28 * - GNS: handle special SRV names --- no delegation, direct lookup;
29 * can likely be done in 'resolver_lookup_get_next_label'. (#3003)
30 * - revocation checks (use CORE-level broadcasts!), (#3004)
31 * - DNAME support (#3005)
34 #include "gnunet_util_lib.h"
35 #include "gnunet_dnsstub_lib.h"
36 #include "gnunet_dht_service.h"
37 #include "gnunet_namestore_service.h"
38 #include "gnunet_dns_service.h"
39 #include "gnunet_resolver_service.h"
40 #include "gnunet_dnsparser_lib.h"
41 #include "gnunet_gns_service.h"
43 #include "gnunet-service-gns_resolver.h"
44 #include "gnunet-service-gns_shorten.h"
45 #include "gnunet_vpn_service.h"
49 * Default DHT timeout for lookups.
51 #define DHT_LOOKUP_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
54 * Default timeout for DNS lookups.
56 #define DNS_LOOKUP_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
59 * Default timeout for VPN redirections.
61 #define VPN_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 30)
64 * DHT replication level
66 #define DHT_GNS_REPLICATION_LEVEL 5
69 * How deep do we allow recursions to go before we abort?
71 #define MAX_RECURSION 256
75 * DLL to hold the authority chain we had to pass in the resolution
83 struct AuthorityChain *prev;
88 struct AuthorityChain *next;
91 * Resolver handle this entry in the chain belongs to.
93 struct GNS_ResolverHandle *rh;
96 * label/name corresponding to the authority
101 * #GNUNET_YES if the authority was a GNS authority,
102 * #GNUNET_NO if the authority was a DNS authority.
107 * Information about the resolver authority for this label.
113 * The zone of the GNS authority
115 struct GNUNET_CRYPTO_EccPublicSignKey gns_authority;
120 * Domain of the DNS resolver that is the authority.
121 * (appended to construct the DNS name to resolve;
122 * this is NOT the DNS name of the DNS server!).
124 char name[GNUNET_DNSPARSER_MAX_NAME_LENGTH + 1];
127 * IP address of the DNS resolver that is authoritative.
128 * (this implementation currently only supports one
131 struct sockaddr_storage dns_ip;
141 * A result we got from DNS.
149 struct DnsResult *next;
154 struct DnsResult *prev;
157 * Binary value stored in the DNS record (appended to this struct)
162 * Expiration time for the DNS record, 0 if we didn't
163 * get anything useful (i.e. 'gethostbyname' was used).
165 uint64_t expiration_time;
168 * Number of bytes in 'data'.
173 * Type of the GNS/DNS record.
175 uint32_t record_type;
181 * Closure for #vpn_allocation_cb.
187 * Which resolution process are we processing.
189 struct GNS_ResolverHandle *rh;
192 * Handle to the VPN request that we were performing.
194 struct GNUNET_VPN_RedirectionRequest *vpn_request;
197 * Number of records serialized in 'rd_data'.
199 unsigned int rd_count;
202 * Serialized records.
207 * Number of bytes in 'rd_data'.
214 * Handle to a currenty pending resolution. On result (positive or
215 * negative) the #GNS_ResultProcessor is called.
217 struct GNS_ResolverHandle
223 struct GNS_ResolverHandle *next;
228 struct GNS_ResolverHandle *prev;
231 * The top-level GNS authoritative zone to query
233 struct GNUNET_CRYPTO_EccPublicSignKey authority_zone;
236 * called when resolution phase finishes
238 GNS_ResultProcessor proc;
241 * closure passed to proc
246 * Handle for DHT lookups. should be NULL if no lookups are in progress
248 struct GNUNET_DHT_GetHandle *get_handle;
251 * Handle to a VPN request, NULL if none is active.
253 struct VpnContext *vpn_ctx;
256 * Socket for a DNS request, NULL if none is active.
258 struct GNUNET_DNSSTUB_RequestSocket *dns_request;
261 * Handle for standard DNS resolution, NULL if none is active.
263 struct GNUNET_RESOLVER_RequestHandle *std_resolve;
266 * Pending Namestore task
268 struct GNUNET_NAMESTORE_QueueEntry *namestore_qe;
271 * Heap node associated with this lookup. Used to limit number of
272 * concurrent requests.
274 struct GNUNET_CONTAINER_HeapNode *dht_heap_node;
277 * DLL to store the authority chain
279 struct AuthorityChain *ac_head;
282 * DLL to store the authority chain
284 struct AuthorityChain *ac_tail;
287 * Private key of the shorten zone, NULL to not shorten.
289 struct GNUNET_CRYPTO_EccPrivateKey *shorten_key;
292 * ID of a task associated with the resolution process.
294 GNUNET_SCHEDULER_TaskIdentifier task_id;
297 * The name to resolve
302 * DLL of results we got from DNS.
304 struct DnsResult *dns_result_head;
307 * DLL of results we got from DNS.
309 struct DnsResult *dns_result_tail;
312 * Current offset in 'name' where we are resolving.
314 size_t name_resolution_pos;
322 * Desired type for the resolution.
327 * We increment the loop limiter for each step in a recursive
328 * resolution. If it passes our threshold (i.e. due to
329 * self-recursion in the resolution, i.e CNAME fun), we stop.
331 unsigned int loop_limiter;
337 * Our handle to the namestore service
339 static struct GNUNET_NAMESTORE_Handle *namestore_handle;
342 * Our handle to the vpn service
344 static struct GNUNET_VPN_Handle *vpn_handle;
347 * Resolver handle to the dht
349 static struct GNUNET_DHT_Handle *dht_handle;
352 * Handle to perform DNS lookups.
354 static struct GNUNET_DNSSTUB_Context *dns_handle;
357 * Heap for limiting parallel DHT lookups
359 static struct GNUNET_CONTAINER_Heap *dht_lookup_heap;
362 * Maximum amount of parallel queries to the DHT
364 static unsigned long long max_allowed_background_queries;
367 * Head of resolver lookup list
369 static struct GNS_ResolverHandle *rlh_head;
372 * Tail of resolver lookup list
374 static struct GNS_ResolverHandle *rlh_tail;
377 * Global configuration.
379 static const struct GNUNET_CONFIGURATION_Handle *cfg;
383 * Check if name is in srv format (_x._y.xxx)
386 * @return #GNUNET_YES if true
389 is_srv (const char *name)
396 if (NULL == strstr (name, "._"))
399 ndup = GNUNET_strdup (name);
401 if (NULL == strtok (NULL, "."))
403 if (NULL == strtok (NULL, "."))
405 if (NULL != strtok (NULL, "."))
413 * Determine if this name is canonical (is a legal name in a zone, without delegation);
414 * note that we do not test that the name does not contain illegal characters, we only
415 * test for delegation. Note that service records (i.e. _foo._srv) are canonical names
416 * even though they consist of multiple labels.
419 * a.b.gnu = not canonical
421 * _foo._srv = canonical
422 * _f.bar = not canonical
424 * @param name the name to test
425 * @return #GNUNET_YES if canonical
428 is_canonical (const char *name)
433 if (NULL == strchr (name, '.'))
438 while (NULL != (dot = strchr (pos, '.')))
446 /* ************************** Resolution **************************** */
449 * Exands a name ending in .+ with the zone of origin.
451 * @param rh resolution context
452 * @param name name to modify (to be free'd or returned)
453 * @return updated name
456 translate_dot_plus (struct GNS_ResolverHandle *rh,
460 size_t s_len = strlen (name);
462 if (0 != strcmp (&name[s_len - 2],
464 return name; /* did not end in ".+" */
465 GNUNET_assert (GNUNET_YES == rh->ac_tail->gns_authority);
466 GNUNET_asprintf (&ret,
470 GNUNET_NAMESTORE_pkey_to_zkey (&rh->ac_tail->authority_info.gns_authority));
477 * Task scheduled to asynchronously fail a resolution.
479 * @param cls the 'struct GNS_ResolverHandle' of the resolution to fail
480 * @param tc task context
483 fail_resolution (void *cls,
484 const struct GNUNET_SCHEDULER_TaskContext *tc)
486 struct GNS_ResolverHandle *rh = cls;
488 rh->task_id = GNUNET_SCHEDULER_NO_TASK;
489 rh->proc (rh->proc_cls, 0, NULL);
490 GNS_resolver_lookup_cancel (rh);
494 #if (defined WINDOWS) || (defined DARWIN)
495 /* Don't have this on W32, here's a naive implementation
496 * Was somehow removed on OS X ... */
498 memrchr (const void *s,
502 const unsigned char *ucs = s;
505 for (i = n - 1; i >= 0; i--)
506 if (c == (int) ucs[i])
507 return (void *) &ucs[i];
514 * Get the next, rightmost label from the name that we are trying to resolve,
515 * and update the resolution position accordingly.
517 * @param rh handle to the resolution operation to get the next label from
518 * @return NULL if there are no more labels
521 resolver_lookup_get_next_label (struct GNS_ResolverHandle *rh)
527 if (0 == rh->name_resolution_pos)
529 dot = memrchr (rh->name, (int) '.', rh->name_resolution_pos);
532 /* done, this was the last one */
533 len = rh->name_resolution_pos;
535 rh->name_resolution_pos = 0;
539 /* advance by one label */
540 len = rh->name_resolution_pos - (dot - rh->name) - 1;
542 rh->name_resolution_pos = dot - rh->name;
544 return GNUNET_strndup (rp, len);
549 * Gives the cummulative result obtained to the callback and clean up the request.
551 * @param rh resolution process that has culminated in a result
554 transmit_lookup_dns_result (struct GNS_ResolverHandle *rh)
556 struct DnsResult *pos;
561 for (pos = rh->dns_result_head; NULL != pos; pos = pos->next)
564 struct GNUNET_NAMESTORE_RecordData rd[n];
567 for (pos = rh->dns_result_head; NULL != pos; pos = pos->next)
569 rd[i].data = pos->data;
570 rd[i].data_size = pos->data_size;
571 rd[i].record_type = pos->record_type;
572 if (0 == pos->expiration_time)
574 rd[i].flags = GNUNET_NAMESTORE_RF_RELATIVE_EXPIRATION;
575 rd[i].expiration_time = 0;
579 rd[i].flags = GNUNET_NAMESTORE_RF_NONE;
580 rd[i].expiration_time = pos->expiration_time;
584 GNUNET_assert (i == n);
585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
586 "Transmitting standard DNS result with %u records\n",
588 rh->proc (rh->proc_cls,
592 GNS_resolver_lookup_cancel (rh);
597 * Add a result from DNS to the records to be returned to the application.
599 * @param rh resolution request to extend with a result
600 * @param expiration_time expiration time for the answer
601 * @param record_type DNS record type of the answer
602 * @param data_size number of bytes in @a data
603 * @param data binary data to return in DNS record
606 add_dns_result (struct GNS_ResolverHandle *rh,
607 uint64_t expiration_time,
608 uint32_t record_type,
612 struct DnsResult *res;
614 res = GNUNET_malloc (sizeof (struct DnsResult) + data_size);
615 res->expiration_time = expiration_time;
616 res->data_size = data_size;
617 res->record_type = record_type;
619 memcpy (&res[1], data, data_size);
620 GNUNET_CONTAINER_DLL_insert (rh->dns_result_head,
627 * We had to do a DNS lookup. Convert the result (if any) and return
630 * @param cls closure with the 'struct GNS_ResolverHandle'
631 * @param addr one of the addresses of the host, NULL for the last address
632 * @param addrlen length of the address
635 handle_dns_result (void *cls,
636 const struct sockaddr *addr,
639 struct GNS_ResolverHandle *rh = cls;
640 const struct sockaddr_in *sa4;
641 const struct sockaddr_in6 *sa6;
643 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
644 "Received %u bytes of DNS IP data\n",
648 rh->std_resolve = NULL;
649 transmit_lookup_dns_result (rh);
652 switch (addr->sa_family)
655 sa4 = (const struct sockaddr_in *) addr;
657 0 /* expiration time is unknown */,
658 GNUNET_DNSPARSER_TYPE_A,
659 sizeof (struct in_addr),
663 sa6 = (const struct sockaddr_in6 *) addr;
665 0 /* expiration time is unknown */,
666 GNUNET_DNSPARSER_TYPE_AAAA,
667 sizeof (struct in6_addr),
678 * Task scheduled to continue with the resolution process.
680 * @param cls the 'struct GNS_ResolverHandle' of the resolution
681 * @param tc task context
684 recursive_resolution (void *cls,
685 const struct GNUNET_SCHEDULER_TaskContext *tc);
689 * Begin the resolution process from 'name', starting with
690 * the identification of the zone specified by 'name'.
692 * @param rh resolution to perform
695 start_resolver_lookup (struct GNS_ResolverHandle *rh);
699 * Function called with the result of a DNS resolution.
701 * @param cls the request handle of the resolution that
702 * we were attempting to make
703 * @param rs socket that received the response
704 * @param dns dns response, never NULL
705 * @param dns_len number of bytes in @a dns
708 dns_result_parser (void *cls,
709 struct GNUNET_DNSSTUB_RequestSocket *rs,
710 const struct GNUNET_TUN_DnsHeader *dns,
713 struct GNS_ResolverHandle *rh = cls;
714 struct GNUNET_DNSPARSER_Packet *p;
715 const struct GNUNET_DNSPARSER_Record *rec;
716 unsigned int rd_count;
719 rh->dns_request = NULL;
720 GNUNET_SCHEDULER_cancel (rh->task_id);
721 rh->task_id = GNUNET_SCHEDULER_NO_TASK;
722 p = GNUNET_DNSPARSER_parse ((const char *) dns,
726 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
727 _("Failed to parse DNS response\n"));
728 rh->proc (rh->proc_cls, 0, NULL);
729 GNS_resolver_lookup_cancel (rh);
732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
733 "Received DNS response for `%s' with %u answers\n",
735 (unsigned int) p->num_answers);
736 if ( (p->num_answers > 0) &&
737 (GNUNET_DNSPARSER_TYPE_CNAME == p->answers[0].type) &&
738 (GNUNET_DNSPARSER_TYPE_CNAME != rh->record_type) )
740 GNUNET_free (rh->name);
741 rh->name = GNUNET_strdup (p->answers[0].data.hostname);
742 start_resolver_lookup (rh);
743 GNUNET_DNSPARSER_free_packet (p);
746 /* FIXME: add DNAME support */
748 /* convert from (parsed) DNS to (binary) GNS format! */
749 rd_count = p->num_answers + p->num_authority_records + p->num_additional_records;
751 struct GNUNET_NAMESTORE_RecordData rd[rd_count];
753 char buf[UINT16_MAX];
759 memset (rd, 0, sizeof (rd));
760 for (i=0;i<rd_count;i++)
762 if (i < p->num_answers)
763 rec = &p->answers[i];
764 else if (i < p->num_answers + p->num_authority_records)
765 rec = &p->authority_records[i - p->num_answers];
767 rec = &p->authority_records[i - p->num_answers - p->num_authority_records];
768 /* As we copied the full DNS name to 'rh->ac_tail->label', this
769 should be the correct check to see if this record is actually
770 a record for our label... */
771 if (0 != strcmp (rec->name,
774 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
775 "Dropping record `%s', does not match desired name `%s'\n",
781 rd[i - skip].record_type = rec->type;
782 rd[i - skip].expiration_time = rec->expiration_time.abs_value_us;
785 case GNUNET_DNSPARSER_TYPE_A:
786 if (rec->data.raw.data_len != sizeof (struct in_addr))
792 rd[i - skip].data_size = rec->data.raw.data_len;
793 rd[i - skip].data = rec->data.raw.data;
795 case GNUNET_DNSPARSER_TYPE_AAAA:
796 if (rec->data.raw.data_len != sizeof (struct in6_addr))
802 rd[i - skip].data_size = rec->data.raw.data_len;
803 rd[i - skip].data = rec->data.raw.data;
805 case GNUNET_DNSPARSER_TYPE_CNAME:
806 case GNUNET_DNSPARSER_TYPE_PTR:
807 case GNUNET_DNSPARSER_TYPE_NS:
810 GNUNET_DNSPARSER_builder_add_name (buf,
819 rd[i - skip].data_size = buf_off - buf_start;
820 rd[i - skip].data = &buf[buf_start];
822 case GNUNET_DNSPARSER_TYPE_SOA:
825 GNUNET_DNSPARSER_builder_add_soa (buf,
834 rd[i - skip].data_size = buf_off - buf_start;
835 rd[i - skip].data = &buf[buf_start];
837 case GNUNET_DNSPARSER_TYPE_MX:
840 GNUNET_DNSPARSER_builder_add_mx (buf,
849 rd[i - skip].data_size = buf_off - buf_start;
850 rd[i - skip].data = &buf[buf_start];
852 case GNUNET_DNSPARSER_TYPE_SRV:
855 GNUNET_DNSPARSER_builder_add_srv (buf,
864 rd[i - skip].data_size = buf_off - buf_start;
865 rd[i - skip].data = &buf[buf_start];
868 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
869 _("Skipping record of unsupported type %d\n"),
875 rh->proc (rh->proc_cls, rd_count - skip, rd);
876 GNS_resolver_lookup_cancel (rh);
878 GNUNET_DNSPARSER_free_packet (p);
883 * Perform recursive DNS resolution. Asks the given DNS resolver to
884 * resolve "rh->dns_name", possibly recursively proceeding following
885 * NS delegations, CNAMES, etc., until 'rh->loop_limiter' bounds us or
886 * we find the answer.
888 * @param rh resolution information
891 recursive_dns_resolution (struct GNS_ResolverHandle *rh)
893 struct AuthorityChain *ac;
895 struct GNUNET_DNSPARSER_Query *query;
896 struct GNUNET_DNSPARSER_Packet *p;
898 size_t dns_request_length;
901 GNUNET_assert (NULL != ac);
902 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
903 "Starting DNS lookup for `%s'\n",
905 GNUNET_assert (GNUNET_NO == ac->gns_authority);
906 switch (((const struct sockaddr *) &ac->authority_info.dns_authority.dns_ip)->sa_family)
909 sa_len = sizeof (struct sockaddr_in);
912 sa_len = sizeof (struct sockaddr_in6);
916 rh->proc (rh->proc_cls, 0, NULL);
917 GNS_resolver_lookup_cancel (rh);
920 query = GNUNET_new (struct GNUNET_DNSPARSER_Query);
921 query->name = GNUNET_strdup (ac->label);
922 query->type = rh->record_type;
923 query->dns_traffic_class = GNUNET_TUN_DNS_CLASS_INTERNET;
924 p = GNUNET_new (struct GNUNET_DNSPARSER_Packet);
927 p->id = (uint16_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
929 p->flags.opcode = GNUNET_TUN_DNS_OPCODE_QUERY;
930 p->flags.recursion_desired = 1;
932 GNUNET_DNSPARSER_pack (p, 1024, &dns_request, &dns_request_length))
935 rh->proc (rh->proc_cls, 0, NULL);
936 GNS_resolver_lookup_cancel (rh);
940 rh->dns_request = GNUNET_DNSSTUB_resolve (dns_handle,
941 (const struct sockaddr *) &ac->authority_info.dns_authority.dns_ip,
947 rh->task_id = GNUNET_SCHEDULER_add_delayed (DNS_LOOKUP_TIMEOUT,
951 GNUNET_free (dns_request);
952 GNUNET_DNSPARSER_free_packet (p);
957 * We encountered a CNAME record during our resolution.
958 * Merge it into our chain.
960 * @param rh resolution we are performing
961 * @param cname value of the cname record we got for the current
962 * authority chain tail
965 handle_gns_cname_result (struct GNS_ResolverHandle *rh,
970 struct AuthorityChain *ac;
972 nlen = strlen (cname);
977 /* CNAME resolution continues relative to current domain */
978 if (0 == rh->name_resolution_pos)
980 res = GNUNET_strndup (cname, nlen - 2);
981 rh->name_resolution_pos = nlen - 2;
985 GNUNET_asprintf (&res,
987 (int) rh->name_resolution_pos,
991 rh->name_resolution_pos = strlen (res);
993 GNUNET_free (rh->name);
995 ac = GNUNET_new (struct AuthorityChain);
997 ac->gns_authority = GNUNET_YES;
998 ac->authority_info.gns_authority = rh->ac_tail->authority_info.gns_authority;
999 ac->label = resolver_lookup_get_next_label (rh);
1000 /* tigger shortening */
1001 if (NULL != rh->shorten_key)
1002 GNS_shorten_start (rh->ac_tail->label,
1003 &ac->authority_info.gns_authority,
1005 /* add AC to tail */
1006 GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
1009 rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
1013 /* name is absolute, start from the beginning */
1014 GNUNET_free (rh->name);
1015 rh->name = GNUNET_strdup (cname);
1016 start_resolver_lookup (rh);
1021 * Process a records that were decrypted from a block.
1023 * @param cls closure with the 'struct GNS_ResolverHandle'
1024 * @param rd_count number of entries in @a rd array
1025 * @param rd array of records with data to store
1028 handle_gns_resolution_result (void *cls,
1029 unsigned int rd_count,
1030 const struct GNUNET_NAMESTORE_RecordData *rd);
1034 * Callback invoked from the VPN service once a redirection is
1035 * available. Provides the IP address that can now be used to
1036 * reach the requested destination. Replaces the "VPN" record
1037 * with the respective A/AAAA record and continues processing.
1039 * @param cls closure
1040 * @param af address family, AF_INET or AF_INET6; AF_UNSPEC on error;
1041 * will match 'result_af' from the request
1042 * @param address IP address (struct in_addr or struct in_addr6, depending on 'af')
1043 * that the VPN allocated for the redirection;
1044 * traffic to this IP will now be redirected to the
1045 * specified target peer; NULL on error
1048 vpn_allocation_cb (void *cls,
1050 const void *address)
1052 struct VpnContext *vpn_ctx = cls;
1053 struct GNS_ResolverHandle *rh = vpn_ctx->rh;
1054 struct GNUNET_NAMESTORE_RecordData rd[vpn_ctx->rd_count];
1057 vpn_ctx->vpn_request = NULL;
1059 GNUNET_assert (GNUNET_OK ==
1060 GNUNET_NAMESTORE_records_deserialize (vpn_ctx->rd_data_size,
1064 for (i=0;i<vpn_ctx->rd_count;i++)
1066 if (GNUNET_NAMESTORE_TYPE_VPN == rd[i].record_type)
1071 rd[i].record_type = GNUNET_DNSPARSER_TYPE_A;
1072 rd[i].data_size = sizeof (struct in_addr);
1073 rd[i].expiration_time = GNUNET_TIME_relative_to_absolute (VPN_TIMEOUT).abs_value_us;
1075 rd[i].data = address;
1078 rd[i].record_type = GNUNET_DNSPARSER_TYPE_AAAA;
1079 rd[i].expiration_time = GNUNET_TIME_relative_to_absolute (VPN_TIMEOUT).abs_value_us;
1081 rd[i].data = address;
1082 rd[i].data_size = sizeof (struct in6_addr);
1090 GNUNET_assert (i < vpn_ctx->rd_count);
1091 handle_gns_resolution_result (rh,
1094 GNUNET_free (vpn_ctx->rd_data);
1095 GNUNET_free (vpn_ctx);
1100 * Process a records that were decrypted from a block.
1102 * @param cls closure with the `struct GNS_ResolverHandle`
1103 * @param rd_count number of entries in @a rd array
1104 * @param rd array of records with data to store
1107 handle_gns_resolution_result (void *cls,
1108 unsigned int rd_count,
1109 const struct GNUNET_NAMESTORE_RecordData *rd)
1111 struct GNS_ResolverHandle *rh = cls;
1112 struct AuthorityChain *ac;
1115 struct sockaddr *sa;
1116 struct sockaddr_in v4;
1117 struct sockaddr_in6 v6;
1120 struct VpnContext *vpn_ctx;
1121 const struct GNUNET_TUN_GnsVpnRecord *vpn;
1123 struct GNUNET_HashCode vhash;
1125 char scratch[UINT16_MAX];
1127 size_t scratch_start;
1129 struct GNUNET_NAMESTORE_RecordData rd_new[rd_count];
1130 unsigned int rd_off;
1132 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1133 "Resolution succeeded for `%s' in zone %s, got %u records\n",
1135 GNUNET_NAMESTORE_z2s (&rh->ac_tail->authority_info.gns_authority),
1137 if (0 == rh->name_resolution_pos)
1139 /* top-level match, are we done yet? */
1140 if ( (rd_count > 0) &&
1141 (GNUNET_DNSPARSER_TYPE_CNAME == rd[0].record_type) &&
1142 (GNUNET_DNSPARSER_TYPE_CNAME != rh->record_type) )
1145 cname = GNUNET_DNSPARSER_parse_name (rd[0].data,
1148 if ( (NULL == cname) ||
1149 (off != rd[0].data_size) )
1151 GNUNET_break_op (0);
1152 rh->proc (rh->proc_cls, 0, NULL);
1153 GNS_resolver_lookup_cancel (rh);
1156 handle_gns_cname_result (rh,
1158 GNUNET_free (cname);
1161 /* If A/AAAA was requested, but we got a VPN
1162 record, we convert it to A/AAAA using GNUnet VPN */
1163 if ( (GNUNET_DNSPARSER_TYPE_A == rh->record_type) ||
1164 (GNUNET_DNSPARSER_TYPE_AAAA == rh->record_type) )
1166 for (i=0;i<rd_count;i++)
1168 switch (rd[i].record_type)
1170 case GNUNET_NAMESTORE_TYPE_VPN:
1172 af = (GNUNET_DNSPARSER_TYPE_A == rh->record_type) ? AF_INET : AF_INET6;
1173 if (sizeof (struct GNUNET_TUN_GnsVpnRecord) <
1176 GNUNET_break_op (0);
1177 rh->proc (rh->proc_cls, 0, NULL);
1178 GNS_resolver_lookup_cancel (rh);
1181 vpn = (const struct GNUNET_TUN_GnsVpnRecord *) rd[i].data;
1182 vname = (const char *) &vpn[1];
1183 if ('\0' != vname[rd[i].data_size - 1 - sizeof (struct GNUNET_TUN_GnsVpnRecord)])
1185 GNUNET_break_op (0);
1186 rh->proc (rh->proc_cls, 0, NULL);
1187 GNS_resolver_lookup_cancel (rh);
1190 GNUNET_CRYPTO_hash (vname,
1191 strlen (vname), // FIXME: +1?
1193 vpn_ctx = GNUNET_new (struct VpnContext);
1194 rh->vpn_ctx = vpn_ctx;
1196 vpn_ctx->rd_data_size = GNUNET_NAMESTORE_records_get_size (rd_count,
1198 vpn_ctx->rd_data = GNUNET_malloc (vpn_ctx->rd_data_size);
1199 (void) GNUNET_NAMESTORE_records_serialize (rd_count,
1201 vpn_ctx->rd_data_size,
1203 vpn_ctx->vpn_request = GNUNET_VPN_redirect_to_peer (vpn_handle,
1208 GNUNET_TIME_relative_to_absolute (VPN_TIMEOUT),
1213 case GNUNET_NAMESTORE_TYPE_GNS2DNS:
1215 /* delegation to DNS */
1223 /* convert relative names in record values to absolute names,
1224 using 'scratch' array for memory allocations */
1227 for (i=0;i<rd_count;i++)
1229 rd_new[rd_off] = rd[i];
1230 /* Check if the embedded name(s) end in "+", and if so,
1231 replace the "+" with the zone at "ac_tail", changing the name
1232 to a ".zkey". The name is allocated on the 'scratch' array,
1233 so we can free it afterwards. */
1234 switch (rd[i].record_type)
1236 case GNUNET_DNSPARSER_TYPE_CNAME:
1241 cname = GNUNET_DNSPARSER_parse_name (rd[i].data,
1244 if ( (NULL == cname) ||
1245 (off != rd[i].data_size) )
1247 GNUNET_break_op (0); /* record not well-formed */
1251 cname = translate_dot_plus (rh, cname);
1252 scratch_start = scratch_off;
1254 GNUNET_DNSPARSER_builder_add_name (scratch,
1263 rd_new[rd_off].data = &scratch[scratch_start];
1264 rd_new[rd_off].data_size = scratch_off - scratch_start;
1268 GNUNET_free_non_null (cname);
1271 case GNUNET_DNSPARSER_TYPE_SOA:
1273 struct GNUNET_DNSPARSER_SoaRecord *soa;
1276 soa = GNUNET_DNSPARSER_parse_soa (rd[i].data,
1279 if ( (NULL == soa) ||
1280 (off != rd[i].data_size) )
1282 GNUNET_break_op (0); /* record not well-formed */
1286 soa->mname = translate_dot_plus (rh, soa->mname);
1287 soa->rname = translate_dot_plus (rh, soa->rname);
1288 scratch_start = scratch_off;
1290 GNUNET_DNSPARSER_builder_add_soa (scratch,
1299 rd_new[rd_off].data = &scratch[scratch_start];
1300 rd_new[rd_off].data_size = scratch_off - scratch_start;
1305 GNUNET_DNSPARSER_free_soa (soa);
1308 case GNUNET_DNSPARSER_TYPE_MX:
1310 struct GNUNET_DNSPARSER_MxRecord *mx;
1313 mx = GNUNET_DNSPARSER_parse_mx (rd[i].data,
1316 if ( (NULL == mx) ||
1317 (off != rd[i].data_size) )
1319 GNUNET_break_op (0); /* record not well-formed */
1323 mx->mxhost = translate_dot_plus (rh, mx->mxhost);
1324 scratch_start = scratch_off;
1326 GNUNET_DNSPARSER_builder_add_mx (scratch,
1335 rd_new[rd_off].data = &scratch[scratch_start];
1336 rd_new[rd_off].data_size = scratch_off - scratch_start;
1341 GNUNET_DNSPARSER_free_mx (mx);
1344 case GNUNET_DNSPARSER_TYPE_SRV:
1346 struct GNUNET_DNSPARSER_SrvRecord *srv;
1349 /* FIXME: passing rh->name here is is not necessarily what we want
1350 (SRV support not finished) */
1351 srv = GNUNET_DNSPARSER_parse_srv (rh->name,
1355 if ( (NULL == srv) ||
1356 (off != rd[i].data_size) )
1358 GNUNET_break_op (0); /* record not well-formed */
1362 srv->domain_name = translate_dot_plus (rh, srv->domain_name);
1363 srv->target = translate_dot_plus (rh, srv->target);
1364 scratch_start = scratch_off;
1366 GNUNET_DNSPARSER_builder_add_srv (scratch,
1375 rd_new[rd_off].data = &scratch[scratch_start];
1376 rd_new[rd_off].data_size = scratch_off - scratch_start;
1381 GNUNET_DNSPARSER_free_srv (srv);
1384 case GNUNET_NAMESTORE_TYPE_PKEY:
1385 /* tigger shortening */
1386 if (NULL != rh->shorten_key)
1388 struct GNUNET_CRYPTO_EccPublicSignKey pub;
1390 if (rd[i].data_size != sizeof (struct GNUNET_CRYPTO_EccPublicSignKey))
1392 GNUNET_break_op (0);
1395 memcpy (&pub, rd[i].data, rd[i].data_size);
1396 GNS_shorten_start (rh->ac_tail->label,
1408 /* yes, we are done, return result */
1409 rh->proc (rh->proc_cls, rd_off, rd_new);
1410 GNS_resolver_lookup_cancel (rh);
1414 /* need to recurse, check if we can */
1415 for (i=0;i<rd_count;i++)
1417 switch (rd[i].record_type)
1419 case GNUNET_NAMESTORE_TYPE_PKEY:
1420 /* delegation to another zone */
1421 if (sizeof (struct GNUNET_CRYPTO_EccPublicSignKey) !=
1424 GNUNET_break_op (0);
1425 rh->proc (rh->proc_cls, 0, NULL);
1426 GNS_resolver_lookup_cancel (rh);
1429 /* expand authority chain */
1430 ac = GNUNET_new (struct AuthorityChain);
1432 ac->gns_authority = GNUNET_YES;
1433 memcpy (&ac->authority_info.gns_authority,
1435 sizeof (struct GNUNET_CRYPTO_EccPublicSignKey));
1436 ac->label = resolver_lookup_get_next_label (rh);
1437 /* tigger shortening */
1438 if (NULL != rh->shorten_key)
1439 GNS_shorten_start (rh->ac_tail->label,
1440 &ac->authority_info.gns_authority,
1442 /* add AC to tail */
1443 GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
1447 rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
1450 case GNUNET_NAMESTORE_TYPE_GNS2DNS:
1453 /* resolution continues within DNS */
1454 if (GNUNET_DNSPARSER_MAX_NAME_LENGTH < rd[i].data_size)
1456 GNUNET_break_op (0);
1457 rh->proc (rh->proc_cls, 0, NULL);
1458 GNS_resolver_lookup_cancel (rh);
1461 /* find associated A/AAAA record */
1464 for (j=0;j<rd_count;j++)
1466 switch (rd[j].record_type)
1468 case GNUNET_DNSPARSER_TYPE_A:
1469 if (sizeof (struct in_addr) != rd[j].data_size)
1471 GNUNET_break_op (0);
1472 rh->proc (rh->proc_cls, 0, NULL);
1473 GNS_resolver_lookup_cancel (rh);
1476 /* FIXME: might want to check if we support IPv4 here,
1477 and otherwise skip this one and hope we find another */
1478 memset (&v4, 0, sizeof (v4));
1479 sa_len = sizeof (v4);
1480 v4.sin_family = AF_INET;
1481 v4.sin_port = htons (53);
1482 #if HAVE_SOCKADDR_IN_SIN_LEN
1483 v4.sin_len = (u_char) sa_len;
1485 memcpy (&v4.sin_addr,
1487 sizeof (struct in_addr));
1488 sa = (struct sockaddr *) &v4;
1490 case GNUNET_DNSPARSER_TYPE_AAAA:
1491 if (sizeof (struct in6_addr) != rd[j].data_size)
1493 GNUNET_break_op (0);
1494 rh->proc (rh->proc_cls, 0, NULL);
1495 GNS_resolver_lookup_cancel (rh);
1498 /* FIXME: might want to check if we support IPv6 here,
1499 and otherwise skip this one and hope we find another */
1500 memset (&v6, 0, sizeof (v6));
1501 sa_len = sizeof (v6);
1502 v6.sin6_family = AF_INET6;
1503 v6.sin6_port = htons (53);
1504 #if HAVE_SOCKADDR_IN_SIN_LEN
1505 v6.sin6_len = (u_char) sa_len;
1507 memcpy (&v6.sin6_addr,
1509 sizeof (struct in6_addr));
1510 sa = (struct sockaddr *) &v6;
1520 /* we cannot continue; NS without A/AAAA */
1521 rh->proc (rh->proc_cls, 0, NULL);
1522 GNS_resolver_lookup_cancel (rh);
1525 /* expand authority chain */
1526 ac = GNUNET_new (struct AuthorityChain);
1529 ns = GNUNET_DNSPARSER_parse_name (rd[i].data,
1532 if ( (NULL == ns) ||
1533 (off != rd[i].data_size) )
1535 GNUNET_break_op (0); /* record not well-formed */
1536 rh->proc (rh->proc_cls, 0, NULL);
1537 GNS_resolver_lookup_cancel (rh);
1540 strcpy (ac->authority_info.dns_authority.name,
1542 memcpy (&ac->authority_info.dns_authority.dns_ip,
1545 /* for DNS recursion, the label is the full DNS name,
1546 created from the remainder of the GNS name and the
1547 name in the NS record */
1548 GNUNET_asprintf (&ac->label,
1550 (int) rh->name_resolution_pos,
1552 (0 != rh->name_resolution_pos) ? "." : "",
1555 GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
1558 if (strlen (ac->label) > GNUNET_DNSPARSER_MAX_NAME_LENGTH)
1560 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1561 _("GNS lookup resulted in DNS name that is too long (`%s')\n"),
1563 rh->proc (rh->proc_cls, 0, NULL);
1564 GNS_resolver_lookup_cancel (rh);
1568 rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
1572 case GNUNET_DNSPARSER_TYPE_CNAME:
1577 cname = GNUNET_DNSPARSER_parse_name (rd[i].data,
1580 if ( (NULL == cname) ||
1581 (off != rd[i].data_size) )
1583 GNUNET_break_op (0); /* record not well-formed */
1584 rh->proc (rh->proc_cls, 0, NULL);
1585 GNS_resolver_lookup_cancel (rh);
1588 handle_gns_cname_result (rh,
1590 GNUNET_free (cname);
1593 /* FIXME: handle DNAME */
1599 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1600 _("GNS lookup recursion failed (no delegation record found)\n"));
1601 rh->proc (rh->proc_cls, 0, NULL);
1602 GNS_resolver_lookup_cancel (rh);
1607 * Function called once the namestore has completed the request for
1610 * @param cls closure with the 'struct GNS_ResolverHandle'
1611 * @param success #GNUNET_OK on success
1612 * @param emsg error message
1615 namestore_cache_continuation (void *cls,
1619 struct GNS_ResolverHandle *rh = cls;
1621 rh->namestore_qe = NULL;
1623 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1624 _("Failed to cache GNS resolution: %s\n"),
1630 * Iterator called on each result obtained for a DHT
1631 * operation that expects a reply
1633 * @param cls closure with the `struct GNS_ResolverHandle`
1634 * @param exp when will this value expire
1635 * @param key key of the result
1636 * @param get_path peers on reply path (or NULL if not recorded)
1637 * [0] = datastore's first neighbor, [length - 1] = local peer
1638 * @param get_path_length number of entries in @a get_path
1639 * @param put_path peers on the PUT path (or NULL if not recorded)
1640 * [0] = origin, [length - 1] = datastore
1641 * @param put_path_length number of entries in @a put_path
1642 * @param type type of the result
1643 * @param size number of bytes in data
1644 * @param data pointer to the result data
1647 handle_dht_response (void *cls,
1648 struct GNUNET_TIME_Absolute exp,
1649 const struct GNUNET_HashCode *key,
1650 const struct GNUNET_PeerIdentity *get_path,
1651 unsigned int get_path_length,
1652 const struct GNUNET_PeerIdentity *put_path,
1653 unsigned int put_path_length,
1654 enum GNUNET_BLOCK_Type type,
1655 size_t size, const void *data)
1657 struct GNS_ResolverHandle *rh = cls;
1658 struct AuthorityChain *ac = rh->ac_tail;
1659 const struct GNUNET_NAMESTORE_Block *block;
1661 GNUNET_DHT_get_stop (rh->get_handle);
1662 rh->get_handle = NULL;
1663 GNUNET_CONTAINER_heap_remove_node (rh->dht_heap_node);
1664 rh->dht_heap_node = NULL;
1665 if (size < sizeof (struct GNUNET_NAMESTORE_Block))
1667 /* how did this pass DHT block validation!? */
1669 rh->proc (rh->proc_cls, 0, NULL);
1670 GNS_resolver_lookup_cancel (rh);
1675 ntohl (block->purpose.size) +
1676 sizeof (struct GNUNET_CRYPTO_EccPublicSignKey) +
1677 sizeof (struct GNUNET_CRYPTO_EccSignature))
1679 /* how did this pass DHT block validation!? */
1681 rh->proc (rh->proc_cls, 0, NULL);
1682 GNS_resolver_lookup_cancel (rh);
1686 GNUNET_NAMESTORE_block_decrypt (block,
1687 &ac->authority_info.gns_authority,
1689 &handle_gns_resolution_result,
1692 GNUNET_break_op (0); /* block was ill-formed */
1693 rh->proc (rh->proc_cls, 0, NULL);
1694 GNS_resolver_lookup_cancel (rh);
1697 /* Cache well-formed blocks */
1698 rh->namestore_qe = GNUNET_NAMESTORE_block_cache (namestore_handle,
1700 &namestore_cache_continuation,
1706 * Process a record that was stored in the namestore.
1708 * @param cls closure with the `struct GNS_ResolverHandle`
1709 * @param block block that was stored in the namestore
1712 handle_namestore_block_response (void *cls,
1713 const struct GNUNET_NAMESTORE_Block *block)
1715 struct GNS_ResolverHandle *rh = cls;
1716 struct GNS_ResolverHandle *rx;
1717 struct AuthorityChain *ac = rh->ac_tail;
1718 const char *label = ac->label;
1719 const struct GNUNET_CRYPTO_EccPublicSignKey *auth = &ac->authority_info.gns_authority;
1720 struct GNUNET_HashCode query;
1722 GNUNET_NAMESTORE_query_from_public_key (auth,
1725 rh->namestore_qe = NULL;
1726 if ( (GNUNET_NO == rh->only_cached) &&
1727 ( (NULL == block) ||
1728 (0 == GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (block->expiration_time)).rel_value_us) ) )
1730 /* Namestore knows nothing; try DHT lookup */
1731 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1732 "Starting DHT lookup for `%s' in zone %s\n",
1734 GNUNET_NAMESTORE_z2s (&ac->authority_info.gns_authority));
1735 rh->get_handle = GNUNET_DHT_get_start (dht_handle,
1736 GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
1738 DHT_GNS_REPLICATION_LEVEL,
1739 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1741 &handle_dht_response, rh);
1742 rh->dht_heap_node = GNUNET_CONTAINER_heap_insert (dht_lookup_heap,
1744 GNUNET_TIME_absolute_get ().abs_value_us);
1745 if (GNUNET_CONTAINER_heap_get_size (dht_lookup_heap) > max_allowed_background_queries)
1747 /* fail longest-standing DHT request */
1748 rx = GNUNET_CONTAINER_heap_peek (dht_lookup_heap);
1749 GNUNET_assert (NULL != rx);
1750 rx->proc (rx->proc_cls, 0, NULL);
1751 GNS_resolver_lookup_cancel (rx);
1755 if ( (NULL == block) ||
1756 (0 == GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (block->expiration_time)).rel_value_us) )
1758 /* DHT not permitted and no local result, fail */
1759 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1760 "Resolution failed for `%s' in zone %s (DHT lookup not permitted by configuration)\n",
1762 GNUNET_NAMESTORE_z2s (&ac->authority_info.gns_authority));
1763 rh->proc (rh->proc_cls, 0, NULL);
1764 GNS_resolver_lookup_cancel (rh);
1768 GNUNET_NAMESTORE_block_decrypt (block,
1771 &handle_gns_resolution_result,
1774 GNUNET_break_op (0); /* block was ill-formed */
1775 rh->proc (rh->proc_cls, 0, NULL);
1776 GNS_resolver_lookup_cancel (rh);
1783 * Lookup tail of our authority chain in the namestore.
1785 * @param rh query we are processing
1788 recursive_gns_resolution_namestore (struct GNS_ResolverHandle *rh)
1790 struct AuthorityChain *ac = rh->ac_tail;
1791 struct GNUNET_HashCode query;
1793 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1794 "Starting GNS resolution for `%s' in zone %s\n",
1796 GNUNET_NAMESTORE_z2s (&ac->authority_info.gns_authority));
1797 GNUNET_NAMESTORE_query_from_public_key (&ac->authority_info.gns_authority,
1800 rh->namestore_qe = GNUNET_NAMESTORE_lookup_block (namestore_handle,
1802 &handle_namestore_block_response,
1808 * Task scheduled to continue with the resolution process.
1810 * @param cls the `struct GNS_ResolverHandle` of the resolution
1811 * @param tc task context
1814 recursive_resolution (void *cls,
1815 const struct GNUNET_SCHEDULER_TaskContext *tc)
1817 struct GNS_ResolverHandle *rh = cls;
1819 rh->task_id = GNUNET_SCHEDULER_NO_TASK;
1820 if (MAX_RECURSION < rh->loop_limiter++)
1822 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1823 "Encountered unbounded recursion resolving `%s'\n",
1825 rh->proc (rh->proc_cls, 0, NULL);
1826 GNS_resolver_lookup_cancel (rh);
1829 if (GNUNET_YES == rh->ac_tail->gns_authority)
1830 recursive_gns_resolution_namestore (rh);
1832 recursive_dns_resolution (rh);
1837 * Begin the resolution process from 'name', starting with
1838 * the identification of the zone specified by 'name'.
1840 * @param rh resolution to perform
1843 start_resolver_lookup (struct GNS_ResolverHandle *rh)
1845 struct AuthorityChain *ac;
1850 if ( ( (GNUNET_YES == is_canonical (rh->name)) &&
1851 (0 != strcmp (GNUNET_GNS_TLD, rh->name)) ) ||
1852 ( (GNUNET_YES != is_gnu_tld (rh->name)) &&
1853 (GNUNET_YES != is_zkey_tld (rh->name)) ) )
1855 /* use standard DNS lookup */
1858 switch (rh->record_type)
1860 case GNUNET_DNSPARSER_TYPE_A:
1863 case GNUNET_DNSPARSER_TYPE_AAAA:
1870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1871 "Doing standard DNS lookup for `%s'\n",
1873 rh->std_resolve = GNUNET_RESOLVER_ip_get (rh->name,
1880 if (is_zkey_tld (rh->name))
1882 /* Name ends with ".zkey", try to replace authority zone with zkey
1884 GNUNET_free (resolver_lookup_get_next_label (rh)); /* will return "zkey" */
1885 x = resolver_lookup_get_next_label (rh); /* will return 'x' coordinate */
1886 y = resolver_lookup_get_next_label (rh); /* will return 'y' coordinate */
1887 GNUNET_asprintf (&pkey,
1893 GNUNET_CRYPTO_ecc_public_sign_key_from_string (pkey,
1895 &rh->authority_zone)) )
1897 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1898 _("Hostname `%s' is not well-formed, resolution fails\n"),
1900 rh->task_id = GNUNET_SCHEDULER_add_now (&fail_resolution, rh);
1902 GNUNET_free_non_null (x);
1903 GNUNET_free_non_null (y);
1908 /* Name ends with ".gnu", eat ".gnu" and continue with resolution */
1909 GNUNET_free (resolver_lookup_get_next_label (rh));
1911 ac = GNUNET_new (struct AuthorityChain);
1913 ac->label = resolver_lookup_get_next_label (rh);
1914 if (NULL == ac->label)
1915 /* name was just "gnu", so we default to label '+' */
1916 ac->label = GNUNET_strdup (GNUNET_GNS_MASTERZONE_STR);
1917 ac->gns_authority = GNUNET_YES;
1918 ac->authority_info.gns_authority = rh->authority_zone;
1919 GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
1922 rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
1928 * Lookup of a record in a specific zone calls lookup result processor
1931 * @param zone the zone to perform the lookup in
1932 * @param record_type the record type to look up
1933 * @param name the name to look up
1934 * @param shorten_key a private key for use with PSEU import (can be NULL)
1935 * @param only_cached #GNUNET_NO to only check locally not DHT for performance
1936 * @param proc the processor to call on result
1937 * @param proc_cls the closure to pass to @a proc
1938 * @return handle to cancel operation
1940 struct GNS_ResolverHandle *
1941 GNS_resolver_lookup (const struct GNUNET_CRYPTO_EccPublicSignKey *zone,
1942 uint32_t record_type,
1944 const struct GNUNET_CRYPTO_EccPrivateKey *shorten_key,
1946 GNS_ResultProcessor proc, void *proc_cls)
1948 struct GNS_ResolverHandle *rh;
1950 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1951 "Starting lookup for `%s'\n",
1953 rh = GNUNET_new (struct GNS_ResolverHandle);
1954 GNUNET_CONTAINER_DLL_insert (rlh_head,
1957 rh->authority_zone = *zone;
1959 rh->proc_cls = proc_cls;
1960 rh->only_cached = only_cached;
1961 rh->record_type = record_type;
1962 rh->name = GNUNET_strdup (name);
1963 rh->name_resolution_pos = strlen (name);
1964 if (NULL != shorten_key)
1966 rh->shorten_key = GNUNET_new (struct GNUNET_CRYPTO_EccPrivateKey);
1967 *rh->shorten_key = *shorten_key;
1969 start_resolver_lookup (rh);
1975 * Cancel active resolution (i.e. client disconnected).
1977 * @param rh resolution to abort
1980 GNS_resolver_lookup_cancel (struct GNS_ResolverHandle *rh)
1982 struct DnsResult *dr;
1983 struct AuthorityChain *ac;
1984 struct VpnContext *vpn_ctx;
1986 GNUNET_CONTAINER_DLL_remove (rlh_head,
1989 while (NULL != (ac = rh->ac_head))
1991 GNUNET_CONTAINER_DLL_remove (rh->ac_head,
1994 GNUNET_free (ac->label);
1997 if (GNUNET_SCHEDULER_NO_TASK != rh->task_id)
1999 GNUNET_SCHEDULER_cancel (rh->task_id);
2000 rh->task_id = GNUNET_SCHEDULER_NO_TASK;
2002 if (NULL != rh->get_handle)
2004 GNUNET_DHT_get_stop (rh->get_handle);
2005 rh->get_handle = NULL;
2007 if (NULL != rh->dht_heap_node)
2009 GNUNET_CONTAINER_heap_remove_node (rh->dht_heap_node);
2010 rh->dht_heap_node = NULL;
2012 if (NULL != (vpn_ctx = rh->vpn_ctx))
2014 GNUNET_VPN_cancel_request (vpn_ctx->vpn_request);
2015 GNUNET_free (vpn_ctx->rd_data);
2016 GNUNET_free (vpn_ctx);
2018 if (NULL != rh->dns_request)
2020 GNUNET_DNSSTUB_resolve_cancel (rh->dns_request);
2021 rh->dns_request = NULL;
2023 if (NULL != rh->namestore_qe)
2025 GNUNET_NAMESTORE_cancel (rh->namestore_qe);
2026 rh->namestore_qe = NULL;
2028 if (NULL != rh->std_resolve)
2030 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2031 "Canceling standard DNS resolution\n");
2032 GNUNET_RESOLVER_request_cancel (rh->std_resolve);
2033 rh->std_resolve = NULL;
2035 while (NULL != (dr = rh->dns_result_head))
2037 GNUNET_CONTAINER_DLL_remove (rh->dns_result_head,
2038 rh->dns_result_tail,
2042 GNUNET_free_non_null (rh->shorten_key);
2043 GNUNET_free (rh->name);
2048 /* ***************** Resolver initialization ********************* */
2052 * Initialize the resolver
2054 * @param nh the namestore handle
2055 * @param dht the dht handle
2056 * @param c configuration handle
2057 * @param max_bg_queries maximum number of parallel background queries in dht
2060 GNS_resolver_init (struct GNUNET_NAMESTORE_Handle *nh,
2061 struct GNUNET_DHT_Handle *dht,
2062 const struct GNUNET_CONFIGURATION_Handle *c,
2063 unsigned long long max_bg_queries)
2068 namestore_handle = nh;
2071 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
2072 max_allowed_background_queries = max_bg_queries;
2074 GNUNET_CONFIGURATION_get_value_string (c,
2079 /* user did not specify DNS resolver, use 8.8.8.8 */
2080 dns_ip = GNUNET_strdup ("8.8.8.8");
2082 dns_handle = GNUNET_DNSSTUB_start (dns_ip);
2083 GNUNET_free (dns_ip);
2084 vpn_handle = GNUNET_VPN_connect (cfg);
2092 GNS_resolver_done ()
2094 struct GNS_ResolverHandle *rh;
2096 /* abort active resolutions */
2097 while (NULL != (rh = rlh_head))
2099 rh->proc (rh->proc_cls, 0, NULL);
2100 GNS_resolver_lookup_cancel (rh);
2102 GNUNET_CONTAINER_heap_destroy (dht_lookup_heap);
2103 dht_lookup_heap = NULL;
2104 GNUNET_DNSSTUB_stop (dns_handle);
2106 GNUNET_VPN_disconnect (vpn_handle);
2109 namestore_handle = NULL;
2113 /* *************** common helper functions (do not really belong here) *********** */
2116 * Checks if @a name ends in ".TLD"
2118 * @param name the name to check
2119 * @param tld the TLD to check for
2120 * @return GNUNET_YES or GNUNET_NO
2123 is_tld (const char* name, const char* tld)
2127 if (strlen (name) <= strlen (tld))
2129 offset = strlen (name) - strlen (tld);
2130 if (0 != strcmp (name + offset, tld))
2136 /* end of gnunet-service-gns_resolver.c */