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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_EccPublicKey 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_EccPublicKey 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, int c, size_t n)
501 unsigned char *ucs = (unsigned char *) s;
503 for (i = n - 1; i >= 0; i--)
505 return (void *) &ucs[i];
512 * Get the next, rightmost label from the name that we are trying to resolve,
513 * and update the resolution position accordingly.
515 * @param rh handle to the resolution operation to get the next label from
516 * @return NULL if there are no more labels
519 resolver_lookup_get_next_label (struct GNS_ResolverHandle *rh)
525 if (0 == rh->name_resolution_pos)
527 dot = memrchr (rh->name, (int) '.', rh->name_resolution_pos);
530 /* done, this was the last one */
531 len = rh->name_resolution_pos;
533 rh->name_resolution_pos = 0;
537 /* advance by one label */
538 len = rh->name_resolution_pos - (dot - rh->name) - 1;
540 rh->name_resolution_pos = dot - rh->name;
542 return GNUNET_strndup (rp, len);
547 * Gives the cummulative result obtained to the callback and clean up the request.
549 * @param rh resolution process that has culminated in a result
552 transmit_lookup_dns_result (struct GNS_ResolverHandle *rh)
554 struct DnsResult *pos;
559 for (pos = rh->dns_result_head; NULL != pos; pos = pos->next)
562 struct GNUNET_NAMESTORE_RecordData rd[n];
565 for (pos = rh->dns_result_head; NULL != pos; pos = pos->next)
567 rd[i].data = pos->data;
568 rd[i].data_size = pos->data_size;
569 rd[i].record_type = pos->record_type;
570 if (0 == pos->expiration_time)
572 rd[i].flags = GNUNET_NAMESTORE_RF_RELATIVE_EXPIRATION;
573 rd[i].expiration_time = 0;
577 rd[i].flags = GNUNET_NAMESTORE_RF_NONE;
578 rd[i].expiration_time = pos->expiration_time;
581 rh->proc (rh->proc_cls,
585 GNS_resolver_lookup_cancel (rh);
590 * Add a result from DNS to the records to be returned to the application.
592 * @param rh resolution request to extend with a result
593 * @param expiration_time expiration time for the answer
594 * @param record_type DNS record type of the answer
595 * @param data_size number of bytes in @a data
596 * @param data binary data to return in DNS record
599 add_dns_result (struct GNS_ResolverHandle *rh,
600 uint64_t expiration_time,
601 uint32_t record_type,
605 struct DnsResult *res;
607 res = GNUNET_malloc (sizeof (struct DnsResult) + data_size);
608 res->expiration_time = expiration_time;
609 res->data_size = data_size;
610 res->record_type = record_type;
612 memcpy (&res[1], data, data_size);
613 GNUNET_CONTAINER_DLL_insert (rh->dns_result_head,
620 * We had to do a DNS lookup. Convert the result (if any) and return
623 * @param cls closure with the 'struct GNS_ResolverHandle'
624 * @param addr one of the addresses of the host, NULL for the last address
625 * @param addrlen length of the address
628 handle_dns_result (void *cls,
629 const struct sockaddr *addr,
632 struct GNS_ResolverHandle *rh = cls;
633 const struct sockaddr_in *sa4;
634 const struct sockaddr_in6 *sa6;
636 rh->std_resolve = NULL;
639 transmit_lookup_dns_result (rh);
642 switch (addr->sa_family)
645 sa4 = (const struct sockaddr_in *) addr;
647 0 /* expiration time is unknown */,
648 GNUNET_DNSPARSER_TYPE_A,
649 sizeof (struct in_addr),
653 sa6 = (const struct sockaddr_in6 *) addr;
655 0 /* expiration time is unknown */,
656 GNUNET_DNSPARSER_TYPE_AAAA,
657 sizeof (struct in6_addr),
668 * Task scheduled to continue with the resolution process.
670 * @param cls the 'struct GNS_ResolverHandle' of the resolution
671 * @param tc task context
674 recursive_resolution (void *cls,
675 const struct GNUNET_SCHEDULER_TaskContext *tc);
679 * Begin the resolution process from 'name', starting with
680 * the identification of the zone specified by 'name'.
682 * @param rh resolution to perform
685 start_resolver_lookup (struct GNS_ResolverHandle *rh);
689 * Function called with the result of a DNS resolution.
691 * @param cls the request handle of the resolution that
692 * we were attempting to make
693 * @param rs socket that received the response
694 * @param dns dns response, never NULL
695 * @param dns_len number of bytes in @a dns
698 dns_result_parser (void *cls,
699 struct GNUNET_DNSSTUB_RequestSocket *rs,
700 const struct GNUNET_TUN_DnsHeader *dns,
703 struct GNS_ResolverHandle *rh = cls;
704 struct GNUNET_DNSPARSER_Packet *p;
705 const struct GNUNET_DNSPARSER_Record *rec;
706 unsigned int rd_count;
709 rh->dns_request = NULL;
710 GNUNET_SCHEDULER_cancel (rh->task_id);
711 rh->task_id = GNUNET_SCHEDULER_NO_TASK;
712 p = GNUNET_DNSPARSER_parse ((const char *) dns,
716 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
717 _("Failed to parse DNS response\n"));
718 rh->proc (rh->proc_cls, 0, NULL);
719 GNS_resolver_lookup_cancel (rh);
723 if ( (p->num_answers > 0) &&
724 (GNUNET_DNSPARSER_TYPE_CNAME == p->answers[0].type) &&
725 (GNUNET_DNSPARSER_TYPE_CNAME != rh->record_type) )
727 GNUNET_free (rh->name);
728 rh->name = GNUNET_strdup (p->answers[0].data.hostname);
729 start_resolver_lookup (rh);
730 GNUNET_DNSPARSER_free_packet (p);
733 /* FIXME: add DNAME support */
735 /* convert from (parsed) DNS to (binary) GNS format! */
736 rd_count = p->num_answers + p->num_authority_records + p->num_additional_records;
738 struct GNUNET_NAMESTORE_RecordData rd[rd_count];
740 char buf[UINT16_MAX];
745 memset (rd, 0, sizeof (rd));
746 for (i=0;i<rd_count;i++)
748 if (i < p->num_answers)
749 rec = &p->answers[i];
750 else if (i < p->num_answers + p->num_authority_records)
751 rec = &p->authority_records[i - p->num_answers];
753 rec = &p->authority_records[i - p->num_answers - p->num_authority_records];
754 /* As we copied the full DNS name to 'rh->ac_tail->label', this
755 should be the correct check to see if this record is actually
756 a record for our label... */
757 if (0 != strcmp (rec->name,
760 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
761 "Dropping record `%s', does not match desired name `%s'\n",
767 rd[i - skip].record_type = rec->type;
768 rd[i - skip].expiration_time = rec->expiration_time.abs_value_us;
771 case GNUNET_DNSPARSER_TYPE_A:
772 if (rec->data.raw.data_len != sizeof (struct in_addr))
778 rd[i - skip].data_size = rec->data.raw.data_len;
779 rd[i - skip].data = rec->data.raw.data;
781 case GNUNET_DNSPARSER_TYPE_AAAA:
782 if (rec->data.raw.data_len != sizeof (struct in6_addr))
788 rd[i - skip].data_size = rec->data.raw.data_len;
789 rd[i - skip].data = rec->data.raw.data;
791 case GNUNET_DNSPARSER_TYPE_CNAME:
792 case GNUNET_DNSPARSER_TYPE_PTR:
793 case GNUNET_DNSPARSER_TYPE_NS:
795 GNUNET_DNSPARSER_builder_add_name (buf,
805 case GNUNET_DNSPARSER_TYPE_SOA:
807 GNUNET_DNSPARSER_builder_add_soa (buf,
817 case GNUNET_DNSPARSER_TYPE_MX:
819 GNUNET_DNSPARSER_builder_add_mx (buf,
829 case GNUNET_DNSPARSER_TYPE_SRV:
831 GNUNET_DNSPARSER_builder_add_srv (buf,
842 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
843 _("Skipping record of unsupported type %d\n"),
849 rh->proc (rh->proc_cls, rd_count - skip, rd);
850 GNS_resolver_lookup_cancel (rh);
852 GNUNET_DNSPARSER_free_packet (p);
857 * Perform recursive DNS resolution. Asks the given DNS resolver to
858 * resolve "rh->dns_name", possibly recursively proceeding following
859 * NS delegations, CNAMES, etc., until 'rh->loop_limiter' bounds us or
860 * we find the answer.
862 * @param rh resolution information
865 recursive_dns_resolution (struct GNS_ResolverHandle *rh)
867 struct AuthorityChain *ac;
869 struct GNUNET_DNSPARSER_Query *query;
870 struct GNUNET_DNSPARSER_Packet *p;
872 size_t dns_request_length;
875 GNUNET_assert (NULL != ac);
876 GNUNET_assert (GNUNET_NO == ac->gns_authority);
877 switch (((const struct sockaddr *) &ac->authority_info.dns_authority.dns_ip)->sa_family)
880 sa_len = sizeof (struct sockaddr_in);
883 sa_len = sizeof (struct sockaddr_in6);
887 rh->proc (rh->proc_cls, 0, NULL);
888 GNS_resolver_lookup_cancel (rh);
891 query = GNUNET_new (struct GNUNET_DNSPARSER_Query);
892 query->name = GNUNET_strdup (ac->label);
893 query->type = rh->record_type;
894 query->class = GNUNET_TUN_DNS_CLASS_INTERNET;
895 p = GNUNET_new (struct GNUNET_DNSPARSER_Packet);
898 p->id = (uint16_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
900 p->flags.opcode = GNUNET_TUN_DNS_OPCODE_QUERY;
901 p->flags.recursion_desired = 1;
903 GNUNET_DNSPARSER_pack (p, 1024, &dns_request, &dns_request_length))
906 rh->proc (rh->proc_cls, 0, NULL);
907 GNS_resolver_lookup_cancel (rh);
911 rh->dns_request = GNUNET_DNSSTUB_resolve (dns_handle,
912 (const struct sockaddr *) &ac->authority_info.dns_authority.dns_ip,
918 rh->task_id = GNUNET_SCHEDULER_add_delayed (DNS_LOOKUP_TIMEOUT,
922 GNUNET_free (dns_request);
923 GNUNET_DNSPARSER_free_packet (p);
928 * We encountered a CNAME record during our resolution.
929 * Merge it into our chain.
931 * @param rh resolution we are performing
932 * @param cname value of the cname record we got for the current
933 * authority chain tail
936 handle_gns_cname_result (struct GNS_ResolverHandle *rh,
942 nlen = strlen (cname);
947 /* CNAME resolution continues relative to current domain */
948 if (0 == rh->name_resolution_pos)
950 res = GNUNET_strndup (cname, nlen - 2);
951 rh->name_resolution_pos = nlen - 2;
955 GNUNET_asprintf (&res,
957 (int) rh->name_resolution_pos,
961 rh->name_resolution_pos = strlen (res);
963 GNUNET_free (rh->name);
965 rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
969 /* name is absolute, start from the beginning */
970 GNUNET_free (rh->name);
971 rh->name = GNUNET_strdup (cname);
972 start_resolver_lookup (rh);
977 * Process a records that were decrypted from a block.
979 * @param cls closure with the 'struct GNS_ResolverHandle'
980 * @param rd_count number of entries in @a rd array
981 * @param rd array of records with data to store
984 handle_gns_resolution_result (void *cls,
985 unsigned int rd_count,
986 const struct GNUNET_NAMESTORE_RecordData *rd);
990 * Callback invoked from the VPN service once a redirection is
991 * available. Provides the IP address that can now be used to
992 * reach the requested destination. Replaces the "VPN" record
993 * with the respective A/AAAA record and continues processing.
996 * @param af address family, AF_INET or AF_INET6; AF_UNSPEC on error;
997 * will match 'result_af' from the request
998 * @param address IP address (struct in_addr or struct in_addr6, depending on 'af')
999 * that the VPN allocated for the redirection;
1000 * traffic to this IP will now be redirected to the
1001 * specified target peer; NULL on error
1004 vpn_allocation_cb (void *cls,
1006 const void *address)
1008 struct VpnContext *vpn_ctx = cls;
1009 struct GNS_ResolverHandle *rh = vpn_ctx->rh;
1010 struct GNUNET_NAMESTORE_RecordData rd[vpn_ctx->rd_count];
1013 vpn_ctx->vpn_request = NULL;
1015 GNUNET_assert (GNUNET_OK ==
1016 GNUNET_NAMESTORE_records_deserialize (vpn_ctx->rd_data_size,
1020 for (i=0;i<vpn_ctx->rd_count;i++)
1022 if (GNUNET_NAMESTORE_TYPE_VPN == rd[i].record_type)
1027 rd[i].record_type = GNUNET_DNSPARSER_TYPE_A;
1028 rd[i].data_size = sizeof (struct in_addr);
1029 rd[i].expiration_time = GNUNET_TIME_relative_to_absolute (VPN_TIMEOUT).abs_value_us;
1031 rd[i].data = address;
1034 rd[i].record_type = GNUNET_DNSPARSER_TYPE_AAAA;
1035 rd[i].expiration_time = GNUNET_TIME_relative_to_absolute (VPN_TIMEOUT).abs_value_us;
1037 rd[i].data = address;
1038 rd[i].data_size = sizeof (struct in6_addr);
1046 GNUNET_assert (i < vpn_ctx->rd_count);
1047 handle_gns_resolution_result (rh,
1050 GNUNET_free (vpn_ctx->rd_data);
1051 GNUNET_free (vpn_ctx);
1056 * Process a records that were decrypted from a block.
1058 * @param cls closure with the 'struct GNS_ResolverHandle'
1059 * @param rd_count number of entries in @a rd array
1060 * @param rd array of records with data to store
1063 handle_gns_resolution_result (void *cls,
1064 unsigned int rd_count,
1065 const struct GNUNET_NAMESTORE_RecordData *rd)
1067 struct GNS_ResolverHandle *rh = cls;
1068 struct AuthorityChain *ac;
1071 struct sockaddr *sa;
1072 struct sockaddr_in v4;
1073 struct sockaddr_in6 v6;
1076 struct VpnContext *vpn_ctx;
1077 const struct GNUNET_TUN_GnsVpnRecord *vpn;
1079 struct GNUNET_HashCode vhash;
1081 char scratch[UINT16_MAX];
1083 size_t scratch_start;
1085 struct GNUNET_NAMESTORE_RecordData rd_new[rd_count];
1086 unsigned int rd_off;
1088 if (0 == rh->name_resolution_pos)
1090 /* top-level match, are we done yet? */
1091 if ( (rd_count > 0) &&
1092 (GNUNET_DNSPARSER_TYPE_CNAME == rd[0].record_type) &&
1093 (GNUNET_DNSPARSER_TYPE_CNAME != rh->record_type) )
1095 cname = GNUNET_strndup (rd[0].data,
1097 handle_gns_cname_result (rh,
1099 GNUNET_free (cname);
1102 /* If A/AAAA was requested, but we got a VPN
1103 record, we convert it to A/AAAA using GNUnet VPN */
1104 if ( (GNUNET_DNSPARSER_TYPE_A == rh->record_type) ||
1105 (GNUNET_DNSPARSER_TYPE_AAAA == rh->record_type) )
1107 for (i=0;i<rd_count;i++)
1109 if (GNUNET_NAMESTORE_TYPE_VPN == rd[i].record_type)
1111 af = (GNUNET_DNSPARSER_TYPE_A == rh->record_type) ? AF_INET : AF_INET6;
1112 if (sizeof (struct GNUNET_TUN_GnsVpnRecord) <
1115 GNUNET_break_op (0);
1116 rh->proc (rh->proc_cls, 0, NULL);
1117 GNS_resolver_lookup_cancel (rh);
1120 vpn = (const struct GNUNET_TUN_GnsVpnRecord *) rd[i].data;
1121 vname = (const char *) &vpn[1];
1122 if ('\0' != vname[rd[i].data_size - 1 - sizeof (struct GNUNET_TUN_GnsVpnRecord)])
1124 GNUNET_break_op (0);
1125 rh->proc (rh->proc_cls, 0, NULL);
1126 GNS_resolver_lookup_cancel (rh);
1129 GNUNET_CRYPTO_hash (vname,
1130 strlen (vname), // FIXME: +1?
1132 vpn_ctx = GNUNET_new (struct VpnContext);
1133 rh->vpn_ctx = vpn_ctx;
1135 vpn_ctx->rd_data_size = GNUNET_NAMESTORE_records_get_size (rd_count,
1137 vpn_ctx->rd_data = GNUNET_malloc (vpn_ctx->rd_data_size);
1138 (void) GNUNET_NAMESTORE_records_serialize (rd_count,
1140 vpn_ctx->rd_data_size,
1142 vpn_ctx->vpn_request = GNUNET_VPN_redirect_to_peer (vpn_handle,
1148 GNUNET_TIME_relative_to_absolute (VPN_TIMEOUT),
1155 /* convert relative names in record values to absolute names,
1156 using 'scratch' array for memory allocations */
1159 for (i=0;i<rd_count;i++)
1161 rd_new[rd_off] = rd[i];
1162 /* Check if the embedded name(s) end in "+", and if so,
1163 replace the "+" with the zone at "ac_tail", changing the name
1164 to a ".zkey". The name is allocated on the 'scratch' array,
1165 so we can free it afterwards. */
1166 switch (rd[i].record_type)
1168 case GNUNET_DNSPARSER_TYPE_CNAME:
1173 cname = GNUNET_DNSPARSER_parse_name (rd[i].data,
1176 if ( (NULL == cname) ||
1177 (off != rd[i].data_size) )
1179 GNUNET_break_op (0); /* record not well-formed */
1183 cname = translate_dot_plus (rh, cname);
1184 scratch_start = scratch_off;
1186 GNUNET_DNSPARSER_builder_add_name (scratch,
1195 rd_new[rd_off].data = &scratch[scratch_start];
1196 rd_new[rd_off].data_size = scratch_off - scratch_start;
1200 GNUNET_free_non_null (cname);
1203 case GNUNET_DNSPARSER_TYPE_SOA:
1205 struct GNUNET_DNSPARSER_SoaRecord *soa;
1208 soa = GNUNET_DNSPARSER_parse_soa (rd[i].data,
1211 if ( (NULL == soa) ||
1212 (off != rd[i].data_size) )
1214 GNUNET_break_op (0); /* record not well-formed */
1218 soa->mname = translate_dot_plus (rh, soa->mname);
1219 soa->rname = translate_dot_plus (rh, soa->rname);
1220 scratch_start = scratch_off;
1222 GNUNET_DNSPARSER_builder_add_soa (scratch,
1231 rd_new[rd_off].data = &scratch[scratch_start];
1232 rd_new[rd_off].data_size = scratch_off - scratch_start;
1237 GNUNET_DNSPARSER_free_soa (soa);
1240 case GNUNET_DNSPARSER_TYPE_MX:
1242 struct GNUNET_DNSPARSER_MxRecord *mx;
1245 mx = GNUNET_DNSPARSER_parse_mx (rd[i].data,
1248 if ( (NULL == mx) ||
1249 (off != rd[i].data_size) )
1251 GNUNET_break_op (0); /* record not well-formed */
1255 mx->mxhost = translate_dot_plus (rh, mx->mxhost);
1256 scratch_start = scratch_off;
1258 GNUNET_DNSPARSER_builder_add_mx (scratch,
1267 rd_new[rd_off].data = &scratch[scratch_start];
1268 rd_new[rd_off].data_size = scratch_off - scratch_start;
1273 GNUNET_DNSPARSER_free_mx (mx);
1276 case GNUNET_DNSPARSER_TYPE_SRV:
1278 struct GNUNET_DNSPARSER_SrvRecord *srv;
1281 /* FIXME: passing rh->name here is is not necessarily what we want
1282 (SRV support not finished) */
1283 srv = GNUNET_DNSPARSER_parse_srv (rh->name,
1287 if ( (NULL == srv) ||
1288 (off != rd[i].data_size) )
1290 GNUNET_break_op (0); /* record not well-formed */
1294 srv->domain_name = translate_dot_plus (rh, srv->domain_name);
1295 srv->target = translate_dot_plus (rh, srv->target);
1296 scratch_start = scratch_off;
1298 GNUNET_DNSPARSER_builder_add_srv (scratch,
1307 rd_new[rd_off].data = &scratch[scratch_start];
1308 rd_new[rd_off].data_size = scratch_off - scratch_start;
1313 GNUNET_DNSPARSER_free_srv (srv);
1316 case GNUNET_NAMESTORE_TYPE_PKEY:
1317 /* tigger shortening */
1318 if (NULL != rh->shorten_key)
1320 struct GNUNET_CRYPTO_EccPublicKey pub;
1322 if (rd[i].data_size != sizeof (struct GNUNET_CRYPTO_EccPublicKey))
1324 GNUNET_break_op (0);
1327 memcpy (&pub, rd[i].data, rd[i].data_size);
1328 GNS_shorten_start (rh->ac_tail->label,
1337 /* yes, we are done, return result */
1338 rh->proc (rh->proc_cls, rd_off, rd_new);
1339 GNS_resolver_lookup_cancel (rh);
1342 /* need to recurse, check if we can */
1343 for (i=0;i<rd_count;i++)
1345 switch (rd[i].record_type)
1347 case GNUNET_NAMESTORE_TYPE_PKEY:
1348 /* delegation to another zone */
1349 if (sizeof (struct GNUNET_CRYPTO_EccPublicKey) !=
1352 GNUNET_break_op (0);
1353 rh->proc (rh->proc_cls, 0, NULL);
1354 GNS_resolver_lookup_cancel (rh);
1357 /* expand authority chain */
1358 ac = GNUNET_new (struct AuthorityChain);
1360 ac->gns_authority = GNUNET_YES;
1361 memcpy (&ac->authority_info.gns_authority,
1363 sizeof (struct GNUNET_CRYPTO_EccPublicKey));
1364 ac->label = resolver_lookup_get_next_label (rh);
1365 /* tigger shortening */
1366 if (NULL != rh->shorten_key)
1367 GNS_shorten_start (rh->ac_tail->label,
1368 &ac->authority_info.gns_authority,
1370 /* add AC to tail */
1371 GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
1375 rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
1378 case GNUNET_DNSPARSER_TYPE_NS:
1379 /* resolution continues within DNS */
1380 if (GNUNET_DNSPARSER_MAX_NAME_LENGTH < rd[i].data_size)
1382 GNUNET_break_op (0);
1383 rh->proc (rh->proc_cls, 0, NULL);
1384 GNS_resolver_lookup_cancel (rh);
1387 /* find associated A/AAAA record */
1390 for (j=0;j<rd_count;j++)
1392 switch (rd[j].record_type)
1394 case GNUNET_DNSPARSER_TYPE_A:
1395 if (sizeof (struct in_addr) != rd[i].data_size)
1397 GNUNET_break_op (0);
1398 rh->proc (rh->proc_cls, 0, NULL);
1399 GNS_resolver_lookup_cancel (rh);
1402 /* FIXME: might want to check if we support IPv4 here,
1403 and otherwise skip this one and hope we find another */
1404 memset (&v4, 0, sizeof (v4));
1405 sa_len = sizeof (v4);
1406 v4.sin_family = AF_INET;
1407 v4.sin_port = htons (53);
1408 #if HAVE_SOCKADDR_IN_SIN_LEN
1409 v4.sin_len = (u_char) sa_len;
1411 memcpy (&v4.sin_addr,
1413 sizeof (struct in_addr));
1414 sa = (struct sockaddr *) &v4;
1416 case GNUNET_DNSPARSER_TYPE_AAAA:
1417 if (sizeof (struct in6_addr) != rd[i].data_size)
1419 GNUNET_break_op (0);
1420 rh->proc (rh->proc_cls, 0, NULL);
1421 GNS_resolver_lookup_cancel (rh);
1424 /* FIXME: might want to check if we support IPv6 here,
1425 and otherwise skip this one and hope we find another */
1426 memset (&v6, 0, sizeof (v6));
1427 sa_len = sizeof (v6);
1428 v6.sin6_family = AF_INET6;
1429 v6.sin6_port = htons (53);
1430 #if HAVE_SOCKADDR_IN_SIN_LEN
1431 v6.sin6_len = (u_char) sa_len;
1433 memcpy (&v6.sin6_addr,
1435 sizeof (struct in6_addr));
1436 sa = (struct sockaddr *) &v6;
1446 /* we cannot continue; NS without A/AAAA */
1447 rh->proc (rh->proc_cls, 0, NULL);
1448 GNS_resolver_lookup_cancel (rh);
1451 /* expand authority chain */
1452 ac = GNUNET_new (struct AuthorityChain);
1454 strncpy (ac->authority_info.dns_authority.name,
1457 ac->authority_info.dns_authority.name[rd[i].data_size] = '\0';
1458 memcpy (&ac->authority_info.dns_authority.dns_ip,
1461 /* for DNS recursion, the label is the full DNS name,
1462 created from the remainder of the GNS name and the
1463 name in the NS record */
1464 GNUNET_asprintf (&ac->label,
1466 (int) rh->name_resolution_pos,
1468 ac->authority_info.dns_authority.name);
1469 GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
1472 if (strlen (ac->label) > GNUNET_DNSPARSER_MAX_NAME_LENGTH)
1474 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1475 _("GNS lookup resulted in DNS name that is too long (`%s')\n"),
1477 rh->proc (rh->proc_cls, 0, NULL);
1478 GNS_resolver_lookup_cancel (rh);
1482 rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
1485 case GNUNET_DNSPARSER_TYPE_CNAME:
1486 cname = GNUNET_strndup (rd[i].data,
1488 handle_gns_cname_result (rh,
1490 GNUNET_free (cname);
1492 /* FIXME: handle DNAME */
1498 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1499 _("GNS lookup recursion failed (no delegation record found)\n"));
1500 rh->proc (rh->proc_cls, 0, NULL);
1501 GNS_resolver_lookup_cancel (rh);
1506 * Function called once the namestore has completed the request for
1509 * @param cls closure with the 'struct GNS_ResolverHandle'
1510 * @param success #GNUNET_OK on success
1511 * @param emsg error message
1514 namestore_cache_continuation (void *cls,
1518 struct GNS_ResolverHandle *rh = cls;
1520 rh->namestore_qe = NULL;
1522 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1523 _("Failed to cache GNS resolution: %s\n"),
1529 * Iterator called on each result obtained for a DHT
1530 * operation that expects a reply
1532 * @param cls closure with the 'struct GNS_ResolverHandle'
1533 * @param exp when will this value expire
1534 * @param key key of the result
1535 * @param get_path peers on reply path (or NULL if not recorded)
1536 * [0] = datastore's first neighbor, [length - 1] = local peer
1537 * @param get_path_length number of entries in get_path
1538 * @param put_path peers on the PUT path (or NULL if not recorded)
1539 * [0] = origin, [length - 1] = datastore
1540 * @param put_path_length number of entries in get_path
1541 * @param type type of the result
1542 * @param size number of bytes in data
1543 * @param data pointer to the result data
1546 handle_dht_response (void *cls,
1547 struct GNUNET_TIME_Absolute exp,
1548 const struct GNUNET_HashCode * key,
1549 const struct GNUNET_PeerIdentity *get_path,
1550 unsigned int get_path_length,
1551 const struct GNUNET_PeerIdentity *put_path,
1552 unsigned int put_path_length,
1553 enum GNUNET_BLOCK_Type type,
1554 size_t size, const void *data)
1556 struct GNS_ResolverHandle *rh = cls;
1557 struct AuthorityChain *ac = rh->ac_tail;
1558 const struct GNUNET_NAMESTORE_Block *block;
1560 GNUNET_DHT_get_stop (rh->get_handle);
1561 rh->get_handle = NULL;
1562 GNUNET_CONTAINER_heap_remove_node (rh->dht_heap_node);
1563 rh->dht_heap_node = NULL;
1564 if (size < sizeof (struct GNUNET_NAMESTORE_Block))
1566 /* how did this pass DHT block validation!? */
1568 rh->proc (rh->proc_cls, 0, NULL);
1569 GNS_resolver_lookup_cancel (rh);
1574 ntohs (block->purpose.size) +
1575 sizeof (struct GNUNET_CRYPTO_EccPublicKey) +
1576 sizeof (struct GNUNET_CRYPTO_EccSignature))
1578 /* how did this pass DHT block validation!? */
1580 rh->proc (rh->proc_cls, 0, NULL);
1581 GNS_resolver_lookup_cancel (rh);
1585 GNUNET_NAMESTORE_block_decrypt (block,
1586 &ac->authority_info.gns_authority,
1588 &handle_gns_resolution_result,
1591 GNUNET_break_op (0); /* block was ill-formed */
1592 rh->proc (rh->proc_cls, 0, NULL);
1593 GNS_resolver_lookup_cancel (rh);
1596 /* Cache well-formed blocks */
1597 rh->namestore_qe = GNUNET_NAMESTORE_block_cache (namestore_handle,
1599 &namestore_cache_continuation,
1605 * Process a record that was stored in the namestore.
1607 * @param cls closure with the `struct GNS_ResolverHandle`
1608 * @param block block that was stored in the namestore
1611 handle_namestore_block_response (void *cls,
1612 const struct GNUNET_NAMESTORE_Block *block)
1614 struct GNS_ResolverHandle *rh = cls;
1615 struct GNS_ResolverHandle *rx;
1616 struct AuthorityChain *ac = rh->ac_tail;
1617 const char *label = ac->label;
1618 const struct GNUNET_CRYPTO_EccPublicKey *auth = &ac->authority_info.gns_authority;
1619 struct GNUNET_HashCode query;
1621 GNUNET_NAMESTORE_query_from_public_key (auth,
1624 rh->namestore_qe = NULL;
1625 if ( (GNUNET_NO == rh->only_cached) &&
1626 ( (NULL == block) ||
1627 (0 == GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (block->expiration_time)).rel_value_us) ) )
1629 /* Namestore knows nothing; try DHT lookup */
1630 rh->get_handle = GNUNET_DHT_get_start (dht_handle,
1631 GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
1633 DHT_GNS_REPLICATION_LEVEL,
1634 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1636 &handle_dht_response, rh);
1637 rh->dht_heap_node = GNUNET_CONTAINER_heap_insert (dht_lookup_heap,
1639 GNUNET_TIME_absolute_get ().abs_value_us);
1640 if (GNUNET_CONTAINER_heap_get_size (dht_lookup_heap) > max_allowed_background_queries)
1642 /* fail longest-standing DHT request */
1643 rx = GNUNET_CONTAINER_heap_peek (dht_lookup_heap);
1644 GNUNET_assert (NULL != rx);
1645 rx->proc (rx->proc_cls, 0, NULL);
1646 GNS_resolver_lookup_cancel (rx);
1650 if ( (NULL == block) ||
1651 (0 == GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (block->expiration_time)).rel_value_us) )
1653 /* DHT not permitted and no local result, fail */
1654 rh->proc (rh->proc_cls, 0, NULL);
1655 GNS_resolver_lookup_cancel (rh);
1659 GNUNET_NAMESTORE_block_decrypt (block,
1662 &handle_gns_resolution_result,
1665 GNUNET_break_op (0); /* block was ill-formed */
1666 rh->proc (rh->proc_cls, 0, NULL);
1667 GNS_resolver_lookup_cancel (rh);
1674 * Lookup tail of our authority chain in the namestore.
1676 * @param rh query we are processing
1679 recursive_gns_resolution_namestore (struct GNS_ResolverHandle *rh)
1681 struct AuthorityChain *ac = rh->ac_tail;
1682 struct GNUNET_HashCode query;
1684 GNUNET_NAMESTORE_query_from_public_key (&ac->authority_info.gns_authority,
1687 rh->namestore_qe = GNUNET_NAMESTORE_lookup_block (namestore_handle,
1689 &handle_namestore_block_response,
1695 * Task scheduled to continue with the resolution process.
1697 * @param cls the `struct GNS_ResolverHandle` of the resolution
1698 * @param tc task context
1701 recursive_resolution (void *cls,
1702 const struct GNUNET_SCHEDULER_TaskContext *tc)
1704 struct GNS_ResolverHandle *rh = cls;
1706 rh->task_id = GNUNET_SCHEDULER_NO_TASK;
1707 if (MAX_RECURSION < rh->loop_limiter++)
1709 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1710 "Encountered unbounded recursion resolving `%s'\n",
1712 rh->proc (rh->proc_cls, 0, NULL);
1713 GNS_resolver_lookup_cancel (rh);
1716 if (GNUNET_YES == rh->ac_tail->gns_authority)
1717 recursive_gns_resolution_namestore (rh);
1719 recursive_dns_resolution (rh);
1724 * Begin the resolution process from 'name', starting with
1725 * the identification of the zone specified by 'name'.
1727 * @param rh resolution to perform
1730 start_resolver_lookup (struct GNS_ResolverHandle *rh)
1732 struct AuthorityChain *ac;
1737 if ( ( (GNUNET_YES == is_canonical (rh->name)) &&
1738 (0 != strcmp (GNUNET_GNS_TLD, rh->name)) ) ||
1739 ( (GNUNET_YES != is_gnu_tld (rh->name)) &&
1740 (GNUNET_YES != is_zkey_tld (rh->name)) ) )
1742 /* use standard DNS lookup */
1745 switch (rh->record_type)
1747 case GNUNET_DNSPARSER_TYPE_A:
1750 case GNUNET_DNSPARSER_TYPE_AAAA:
1757 rh->std_resolve = GNUNET_RESOLVER_ip_get (rh->name,
1764 if (is_zkey_tld (rh->name))
1766 /* Name ends with ".zkey", try to replace authority zone with zkey
1768 GNUNET_free (resolver_lookup_get_next_label (rh)); /* will return "zkey" */
1769 x = resolver_lookup_get_next_label (rh); /* will return 'x' coordinate */
1770 y = resolver_lookup_get_next_label (rh); /* will return 'y' coordinate */
1771 GNUNET_asprintf (&pkey,
1777 GNUNET_CRYPTO_ecc_public_key_from_string (pkey,
1779 &rh->authority_zone)) )
1781 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1782 _("Hostname `%s' is not well-formed, resolution fails\n"),
1784 rh->task_id = GNUNET_SCHEDULER_add_now (&fail_resolution, rh);
1786 GNUNET_free_non_null (x);
1787 GNUNET_free_non_null (y);
1792 /* Name ends with ".gnu", eat ".gnu" and continue with resolution */
1793 GNUNET_free (resolver_lookup_get_next_label (rh));
1795 ac = GNUNET_new (struct AuthorityChain);
1797 ac->label = resolver_lookup_get_next_label (rh);
1798 if (NULL == ac->label)
1799 /* name was just "gnu", so we default to label '+' */
1800 ac->label = GNUNET_strdup (GNUNET_GNS_MASTERZONE_STR);
1801 ac->gns_authority = GNUNET_YES;
1802 ac->authority_info.gns_authority = rh->authority_zone;
1803 GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
1806 rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
1812 * Lookup of a record in a specific zone calls lookup result processor
1815 * @param zone the zone to perform the lookup in
1816 * @param record_type the record type to look up
1817 * @param name the name to look up
1818 * @param shorten_key a private key for use with PSEU import (can be NULL)
1819 * @param only_cached #GNUNET_NO to only check locally not DHT for performance
1820 * @param proc the processor to call on result
1821 * @param proc_cls the closure to pass to @a proc
1822 * @return handle to cancel operation
1824 struct GNS_ResolverHandle *
1825 GNS_resolver_lookup (const struct GNUNET_CRYPTO_EccPublicKey *zone,
1826 uint32_t record_type,
1828 const struct GNUNET_CRYPTO_EccPrivateKey *shorten_key,
1830 GNS_ResultProcessor proc, void *proc_cls)
1832 struct GNS_ResolverHandle *rh;
1834 rh = GNUNET_new (struct GNS_ResolverHandle);
1835 GNUNET_CONTAINER_DLL_insert (rlh_head,
1838 rh->authority_zone = *zone;
1840 rh->proc_cls = proc_cls;
1841 rh->only_cached = only_cached;
1842 rh->record_type = record_type;
1843 rh->name = GNUNET_strdup (name);
1844 rh->name_resolution_pos = strlen (name);
1845 if (NULL != shorten_key)
1847 rh->shorten_key = GNUNET_new (struct GNUNET_CRYPTO_EccPrivateKey);
1848 *rh->shorten_key = *shorten_key;
1850 start_resolver_lookup (rh);
1856 * Cancel active resolution (i.e. client disconnected).
1858 * @param rh resolution to abort
1861 GNS_resolver_lookup_cancel (struct GNS_ResolverHandle *rh)
1863 struct DnsResult *dr;
1864 struct AuthorityChain *ac;
1865 struct VpnContext *vpn_ctx;
1867 GNUNET_CONTAINER_DLL_remove (rlh_head,
1870 while (NULL != (ac = rh->ac_head))
1872 GNUNET_CONTAINER_DLL_remove (rh->ac_head,
1875 GNUNET_free (ac->label);
1878 if (GNUNET_SCHEDULER_NO_TASK != rh->task_id)
1880 GNUNET_SCHEDULER_cancel (rh->task_id);
1881 rh->task_id = GNUNET_SCHEDULER_NO_TASK;
1883 if (NULL != rh->get_handle)
1885 GNUNET_DHT_get_stop (rh->get_handle);
1886 rh->get_handle = NULL;
1888 if (NULL != rh->dht_heap_node)
1890 GNUNET_CONTAINER_heap_remove_node (rh->dht_heap_node);
1891 rh->dht_heap_node = NULL;
1893 if (NULL != (vpn_ctx = rh->vpn_ctx))
1895 GNUNET_VPN_cancel_request (vpn_ctx->vpn_request);
1896 GNUNET_free (vpn_ctx->rd_data);
1897 GNUNET_free (vpn_ctx);
1899 if (NULL != rh->dns_request)
1901 GNUNET_DNSSTUB_resolve_cancel (rh->dns_request);
1902 rh->dns_request = NULL;
1904 if (NULL != rh->namestore_qe)
1906 GNUNET_NAMESTORE_cancel (rh->namestore_qe);
1907 rh->namestore_qe = NULL;
1909 if (NULL != rh->std_resolve)
1911 GNUNET_RESOLVER_request_cancel (rh->std_resolve);
1912 rh->std_resolve = NULL;
1914 while (NULL != (dr = rh->dns_result_head))
1916 GNUNET_CONTAINER_DLL_remove (rh->dns_result_head,
1917 rh->dns_result_tail,
1921 GNUNET_free_non_null (rh->shorten_key);
1922 GNUNET_free (rh->name);
1927 /* ***************** Resolver initialization ********************* */
1931 * Initialize the resolver
1933 * @param nh the namestore handle
1934 * @param dht the dht handle
1935 * @param c configuration handle
1936 * @param max_bg_queries maximum number of parallel background queries in dht
1939 GNS_resolver_init (struct GNUNET_NAMESTORE_Handle *nh,
1940 struct GNUNET_DHT_Handle *dht,
1941 const struct GNUNET_CONFIGURATION_Handle *c,
1942 unsigned long long max_bg_queries)
1947 namestore_handle = nh;
1950 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1951 max_allowed_background_queries = max_bg_queries;
1953 GNUNET_CONFIGURATION_get_value_string (c,
1958 /* user did not specify DNS resolver, use 8.8.8.8 */
1959 dns_ip = GNUNET_strdup ("8.8.8.8");
1961 dns_handle = GNUNET_DNSSTUB_start (dns_ip);
1962 GNUNET_free (dns_ip);
1963 vpn_handle = GNUNET_VPN_connect (cfg);
1971 GNS_resolver_done ()
1973 struct GNS_ResolverHandle *rh;
1975 /* abort active resolutions */
1976 while (NULL != (rh = rlh_head))
1978 rh->proc (rh->proc_cls, 0, NULL);
1979 GNS_resolver_lookup_cancel (rh);
1981 GNUNET_CONTAINER_heap_destroy (dht_lookup_heap);
1982 dht_lookup_heap = NULL;
1983 GNUNET_DNSSTUB_stop (dns_handle);
1985 GNUNET_VPN_disconnect (vpn_handle);
1988 namestore_handle = NULL;
1992 /* *************** common helper functions (do not really belong here) *********** */
1995 * Checks if @a name ends in ".TLD"
1997 * @param name the name to check
1998 * @param tld the TLD to check for
1999 * @return GNUNET_YES or GNUNET_NO
2002 is_tld (const char* name, const char* tld)
2006 if (strlen (name) <= strlen (tld))
2008 offset = strlen (name) - strlen (tld);
2009 if (0 != strcmp (name + offset, tld))
2015 /* end of gnunet-service-gns_resolver.c */