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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, 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;
582 GNUNET_assert (i == n);
583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
584 "Transmitting standard DNS result with %u records\n",
586 rh->proc (rh->proc_cls,
590 GNS_resolver_lookup_cancel (rh);
595 * Add a result from DNS to the records to be returned to the application.
597 * @param rh resolution request to extend with a result
598 * @param expiration_time expiration time for the answer
599 * @param record_type DNS record type of the answer
600 * @param data_size number of bytes in @a data
601 * @param data binary data to return in DNS record
604 add_dns_result (struct GNS_ResolverHandle *rh,
605 uint64_t expiration_time,
606 uint32_t record_type,
610 struct DnsResult *res;
612 res = GNUNET_malloc (sizeof (struct DnsResult) + data_size);
613 res->expiration_time = expiration_time;
614 res->data_size = data_size;
615 res->record_type = record_type;
617 memcpy (&res[1], data, data_size);
618 GNUNET_CONTAINER_DLL_insert (rh->dns_result_head,
625 * We had to do a DNS lookup. Convert the result (if any) and return
628 * @param cls closure with the 'struct GNS_ResolverHandle'
629 * @param addr one of the addresses of the host, NULL for the last address
630 * @param addrlen length of the address
633 handle_dns_result (void *cls,
634 const struct sockaddr *addr,
637 struct GNS_ResolverHandle *rh = cls;
638 const struct sockaddr_in *sa4;
639 const struct sockaddr_in6 *sa6;
641 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
642 "Received %u bytes of DNS IP data\n",
646 rh->std_resolve = NULL;
647 transmit_lookup_dns_result (rh);
650 switch (addr->sa_family)
653 sa4 = (const struct sockaddr_in *) addr;
655 0 /* expiration time is unknown */,
656 GNUNET_DNSPARSER_TYPE_A,
657 sizeof (struct in_addr),
661 sa6 = (const struct sockaddr_in6 *) addr;
663 0 /* expiration time is unknown */,
664 GNUNET_DNSPARSER_TYPE_AAAA,
665 sizeof (struct in6_addr),
676 * Task scheduled to continue with the resolution process.
678 * @param cls the 'struct GNS_ResolverHandle' of the resolution
679 * @param tc task context
682 recursive_resolution (void *cls,
683 const struct GNUNET_SCHEDULER_TaskContext *tc);
687 * Begin the resolution process from 'name', starting with
688 * the identification of the zone specified by 'name'.
690 * @param rh resolution to perform
693 start_resolver_lookup (struct GNS_ResolverHandle *rh);
697 * Function called with the result of a DNS resolution.
699 * @param cls the request handle of the resolution that
700 * we were attempting to make
701 * @param rs socket that received the response
702 * @param dns dns response, never NULL
703 * @param dns_len number of bytes in @a dns
706 dns_result_parser (void *cls,
707 struct GNUNET_DNSSTUB_RequestSocket *rs,
708 const struct GNUNET_TUN_DnsHeader *dns,
711 struct GNS_ResolverHandle *rh = cls;
712 struct GNUNET_DNSPARSER_Packet *p;
713 const struct GNUNET_DNSPARSER_Record *rec;
714 unsigned int rd_count;
717 rh->dns_request = NULL;
718 GNUNET_SCHEDULER_cancel (rh->task_id);
719 rh->task_id = GNUNET_SCHEDULER_NO_TASK;
720 p = GNUNET_DNSPARSER_parse ((const char *) dns,
724 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
725 _("Failed to parse DNS response\n"));
726 rh->proc (rh->proc_cls, 0, NULL);
727 GNS_resolver_lookup_cancel (rh);
731 if ( (p->num_answers > 0) &&
732 (GNUNET_DNSPARSER_TYPE_CNAME == p->answers[0].type) &&
733 (GNUNET_DNSPARSER_TYPE_CNAME != rh->record_type) )
735 GNUNET_free (rh->name);
736 rh->name = GNUNET_strdup (p->answers[0].data.hostname);
737 start_resolver_lookup (rh);
738 GNUNET_DNSPARSER_free_packet (p);
741 /* FIXME: add DNAME support */
743 /* convert from (parsed) DNS to (binary) GNS format! */
744 rd_count = p->num_answers + p->num_authority_records + p->num_additional_records;
746 struct GNUNET_NAMESTORE_RecordData rd[rd_count];
748 char buf[UINT16_MAX];
753 memset (rd, 0, sizeof (rd));
754 for (i=0;i<rd_count;i++)
756 if (i < p->num_answers)
757 rec = &p->answers[i];
758 else if (i < p->num_answers + p->num_authority_records)
759 rec = &p->authority_records[i - p->num_answers];
761 rec = &p->authority_records[i - p->num_answers - p->num_authority_records];
762 /* As we copied the full DNS name to 'rh->ac_tail->label', this
763 should be the correct check to see if this record is actually
764 a record for our label... */
765 if (0 != strcmp (rec->name,
768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
769 "Dropping record `%s', does not match desired name `%s'\n",
775 rd[i - skip].record_type = rec->type;
776 rd[i - skip].expiration_time = rec->expiration_time.abs_value_us;
779 case GNUNET_DNSPARSER_TYPE_A:
780 if (rec->data.raw.data_len != sizeof (struct in_addr))
786 rd[i - skip].data_size = rec->data.raw.data_len;
787 rd[i - skip].data = rec->data.raw.data;
789 case GNUNET_DNSPARSER_TYPE_AAAA:
790 if (rec->data.raw.data_len != sizeof (struct in6_addr))
796 rd[i - skip].data_size = rec->data.raw.data_len;
797 rd[i - skip].data = rec->data.raw.data;
799 case GNUNET_DNSPARSER_TYPE_CNAME:
800 case GNUNET_DNSPARSER_TYPE_PTR:
801 case GNUNET_DNSPARSER_TYPE_NS:
803 GNUNET_DNSPARSER_builder_add_name (buf,
813 case GNUNET_DNSPARSER_TYPE_SOA:
815 GNUNET_DNSPARSER_builder_add_soa (buf,
825 case GNUNET_DNSPARSER_TYPE_MX:
827 GNUNET_DNSPARSER_builder_add_mx (buf,
837 case GNUNET_DNSPARSER_TYPE_SRV:
839 GNUNET_DNSPARSER_builder_add_srv (buf,
850 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
851 _("Skipping record of unsupported type %d\n"),
857 rh->proc (rh->proc_cls, rd_count - skip, rd);
858 GNS_resolver_lookup_cancel (rh);
860 GNUNET_DNSPARSER_free_packet (p);
865 * Perform recursive DNS resolution. Asks the given DNS resolver to
866 * resolve "rh->dns_name", possibly recursively proceeding following
867 * NS delegations, CNAMES, etc., until 'rh->loop_limiter' bounds us or
868 * we find the answer.
870 * @param rh resolution information
873 recursive_dns_resolution (struct GNS_ResolverHandle *rh)
875 struct AuthorityChain *ac;
877 struct GNUNET_DNSPARSER_Query *query;
878 struct GNUNET_DNSPARSER_Packet *p;
880 size_t dns_request_length;
883 GNUNET_assert (NULL != ac);
884 GNUNET_assert (GNUNET_NO == ac->gns_authority);
885 switch (((const struct sockaddr *) &ac->authority_info.dns_authority.dns_ip)->sa_family)
888 sa_len = sizeof (struct sockaddr_in);
891 sa_len = sizeof (struct sockaddr_in6);
895 rh->proc (rh->proc_cls, 0, NULL);
896 GNS_resolver_lookup_cancel (rh);
899 query = GNUNET_new (struct GNUNET_DNSPARSER_Query);
900 query->name = GNUNET_strdup (ac->label);
901 query->type = rh->record_type;
902 query->class = GNUNET_TUN_DNS_CLASS_INTERNET;
903 p = GNUNET_new (struct GNUNET_DNSPARSER_Packet);
906 p->id = (uint16_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
908 p->flags.opcode = GNUNET_TUN_DNS_OPCODE_QUERY;
909 p->flags.recursion_desired = 1;
911 GNUNET_DNSPARSER_pack (p, 1024, &dns_request, &dns_request_length))
914 rh->proc (rh->proc_cls, 0, NULL);
915 GNS_resolver_lookup_cancel (rh);
919 rh->dns_request = GNUNET_DNSSTUB_resolve (dns_handle,
920 (const struct sockaddr *) &ac->authority_info.dns_authority.dns_ip,
926 rh->task_id = GNUNET_SCHEDULER_add_delayed (DNS_LOOKUP_TIMEOUT,
930 GNUNET_free (dns_request);
931 GNUNET_DNSPARSER_free_packet (p);
936 * We encountered a CNAME record during our resolution.
937 * Merge it into our chain.
939 * @param rh resolution we are performing
940 * @param cname value of the cname record we got for the current
941 * authority chain tail
944 handle_gns_cname_result (struct GNS_ResolverHandle *rh,
950 nlen = strlen (cname);
955 /* CNAME resolution continues relative to current domain */
956 if (0 == rh->name_resolution_pos)
958 res = GNUNET_strndup (cname, nlen - 2);
959 rh->name_resolution_pos = nlen - 2;
963 GNUNET_asprintf (&res,
965 (int) rh->name_resolution_pos,
969 rh->name_resolution_pos = strlen (res);
971 GNUNET_free (rh->name);
973 rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
977 /* name is absolute, start from the beginning */
978 GNUNET_free (rh->name);
979 rh->name = GNUNET_strdup (cname);
980 start_resolver_lookup (rh);
985 * Process a records that were decrypted from a block.
987 * @param cls closure with the 'struct GNS_ResolverHandle'
988 * @param rd_count number of entries in @a rd array
989 * @param rd array of records with data to store
992 handle_gns_resolution_result (void *cls,
993 unsigned int rd_count,
994 const struct GNUNET_NAMESTORE_RecordData *rd);
998 * Callback invoked from the VPN service once a redirection is
999 * available. Provides the IP address that can now be used to
1000 * reach the requested destination. Replaces the "VPN" record
1001 * with the respective A/AAAA record and continues processing.
1003 * @param cls closure
1004 * @param af address family, AF_INET or AF_INET6; AF_UNSPEC on error;
1005 * will match 'result_af' from the request
1006 * @param address IP address (struct in_addr or struct in_addr6, depending on 'af')
1007 * that the VPN allocated for the redirection;
1008 * traffic to this IP will now be redirected to the
1009 * specified target peer; NULL on error
1012 vpn_allocation_cb (void *cls,
1014 const void *address)
1016 struct VpnContext *vpn_ctx = cls;
1017 struct GNS_ResolverHandle *rh = vpn_ctx->rh;
1018 struct GNUNET_NAMESTORE_RecordData rd[vpn_ctx->rd_count];
1021 vpn_ctx->vpn_request = NULL;
1023 GNUNET_assert (GNUNET_OK ==
1024 GNUNET_NAMESTORE_records_deserialize (vpn_ctx->rd_data_size,
1028 for (i=0;i<vpn_ctx->rd_count;i++)
1030 if (GNUNET_NAMESTORE_TYPE_VPN == rd[i].record_type)
1035 rd[i].record_type = GNUNET_DNSPARSER_TYPE_A;
1036 rd[i].data_size = sizeof (struct in_addr);
1037 rd[i].expiration_time = GNUNET_TIME_relative_to_absolute (VPN_TIMEOUT).abs_value_us;
1039 rd[i].data = address;
1042 rd[i].record_type = GNUNET_DNSPARSER_TYPE_AAAA;
1043 rd[i].expiration_time = GNUNET_TIME_relative_to_absolute (VPN_TIMEOUT).abs_value_us;
1045 rd[i].data = address;
1046 rd[i].data_size = sizeof (struct in6_addr);
1054 GNUNET_assert (i < vpn_ctx->rd_count);
1055 handle_gns_resolution_result (rh,
1058 GNUNET_free (vpn_ctx->rd_data);
1059 GNUNET_free (vpn_ctx);
1064 * Process a records that were decrypted from a block.
1066 * @param cls closure with the 'struct GNS_ResolverHandle'
1067 * @param rd_count number of entries in @a rd array
1068 * @param rd array of records with data to store
1071 handle_gns_resolution_result (void *cls,
1072 unsigned int rd_count,
1073 const struct GNUNET_NAMESTORE_RecordData *rd)
1075 struct GNS_ResolverHandle *rh = cls;
1076 struct AuthorityChain *ac;
1079 struct sockaddr *sa;
1080 struct sockaddr_in v4;
1081 struct sockaddr_in6 v6;
1084 struct VpnContext *vpn_ctx;
1085 const struct GNUNET_TUN_GnsVpnRecord *vpn;
1087 struct GNUNET_HashCode vhash;
1089 char scratch[UINT16_MAX];
1091 size_t scratch_start;
1093 struct GNUNET_NAMESTORE_RecordData rd_new[rd_count];
1094 unsigned int rd_off;
1096 if (0 == rh->name_resolution_pos)
1098 /* top-level match, are we done yet? */
1099 if ( (rd_count > 0) &&
1100 (GNUNET_DNSPARSER_TYPE_CNAME == rd[0].record_type) &&
1101 (GNUNET_DNSPARSER_TYPE_CNAME != rh->record_type) )
1103 cname = GNUNET_strndup (rd[0].data,
1105 handle_gns_cname_result (rh,
1107 GNUNET_free (cname);
1110 /* If A/AAAA was requested, but we got a VPN
1111 record, we convert it to A/AAAA using GNUnet VPN */
1112 if ( (GNUNET_DNSPARSER_TYPE_A == rh->record_type) ||
1113 (GNUNET_DNSPARSER_TYPE_AAAA == rh->record_type) )
1115 for (i=0;i<rd_count;i++)
1117 if (GNUNET_NAMESTORE_TYPE_VPN == rd[i].record_type)
1119 af = (GNUNET_DNSPARSER_TYPE_A == rh->record_type) ? AF_INET : AF_INET6;
1120 if (sizeof (struct GNUNET_TUN_GnsVpnRecord) <
1123 GNUNET_break_op (0);
1124 rh->proc (rh->proc_cls, 0, NULL);
1125 GNS_resolver_lookup_cancel (rh);
1128 vpn = (const struct GNUNET_TUN_GnsVpnRecord *) rd[i].data;
1129 vname = (const char *) &vpn[1];
1130 if ('\0' != vname[rd[i].data_size - 1 - sizeof (struct GNUNET_TUN_GnsVpnRecord)])
1132 GNUNET_break_op (0);
1133 rh->proc (rh->proc_cls, 0, NULL);
1134 GNS_resolver_lookup_cancel (rh);
1137 GNUNET_CRYPTO_hash (vname,
1138 strlen (vname), // FIXME: +1?
1140 vpn_ctx = GNUNET_new (struct VpnContext);
1141 rh->vpn_ctx = vpn_ctx;
1143 vpn_ctx->rd_data_size = GNUNET_NAMESTORE_records_get_size (rd_count,
1145 vpn_ctx->rd_data = GNUNET_malloc (vpn_ctx->rd_data_size);
1146 (void) GNUNET_NAMESTORE_records_serialize (rd_count,
1148 vpn_ctx->rd_data_size,
1150 vpn_ctx->vpn_request = GNUNET_VPN_redirect_to_peer (vpn_handle,
1155 GNUNET_TIME_relative_to_absolute (VPN_TIMEOUT),
1162 /* convert relative names in record values to absolute names,
1163 using 'scratch' array for memory allocations */
1166 for (i=0;i<rd_count;i++)
1168 rd_new[rd_off] = rd[i];
1169 /* Check if the embedded name(s) end in "+", and if so,
1170 replace the "+" with the zone at "ac_tail", changing the name
1171 to a ".zkey". The name is allocated on the 'scratch' array,
1172 so we can free it afterwards. */
1173 switch (rd[i].record_type)
1175 case GNUNET_DNSPARSER_TYPE_CNAME:
1180 cname = GNUNET_DNSPARSER_parse_name (rd[i].data,
1183 if ( (NULL == cname) ||
1184 (off != rd[i].data_size) )
1186 GNUNET_break_op (0); /* record not well-formed */
1190 cname = translate_dot_plus (rh, cname);
1191 scratch_start = scratch_off;
1193 GNUNET_DNSPARSER_builder_add_name (scratch,
1202 rd_new[rd_off].data = &scratch[scratch_start];
1203 rd_new[rd_off].data_size = scratch_off - scratch_start;
1207 GNUNET_free_non_null (cname);
1210 case GNUNET_DNSPARSER_TYPE_SOA:
1212 struct GNUNET_DNSPARSER_SoaRecord *soa;
1215 soa = GNUNET_DNSPARSER_parse_soa (rd[i].data,
1218 if ( (NULL == soa) ||
1219 (off != rd[i].data_size) )
1221 GNUNET_break_op (0); /* record not well-formed */
1225 soa->mname = translate_dot_plus (rh, soa->mname);
1226 soa->rname = translate_dot_plus (rh, soa->rname);
1227 scratch_start = scratch_off;
1229 GNUNET_DNSPARSER_builder_add_soa (scratch,
1238 rd_new[rd_off].data = &scratch[scratch_start];
1239 rd_new[rd_off].data_size = scratch_off - scratch_start;
1244 GNUNET_DNSPARSER_free_soa (soa);
1247 case GNUNET_DNSPARSER_TYPE_MX:
1249 struct GNUNET_DNSPARSER_MxRecord *mx;
1252 mx = GNUNET_DNSPARSER_parse_mx (rd[i].data,
1255 if ( (NULL == mx) ||
1256 (off != rd[i].data_size) )
1258 GNUNET_break_op (0); /* record not well-formed */
1262 mx->mxhost = translate_dot_plus (rh, mx->mxhost);
1263 scratch_start = scratch_off;
1265 GNUNET_DNSPARSER_builder_add_mx (scratch,
1274 rd_new[rd_off].data = &scratch[scratch_start];
1275 rd_new[rd_off].data_size = scratch_off - scratch_start;
1280 GNUNET_DNSPARSER_free_mx (mx);
1283 case GNUNET_DNSPARSER_TYPE_SRV:
1285 struct GNUNET_DNSPARSER_SrvRecord *srv;
1288 /* FIXME: passing rh->name here is is not necessarily what we want
1289 (SRV support not finished) */
1290 srv = GNUNET_DNSPARSER_parse_srv (rh->name,
1294 if ( (NULL == srv) ||
1295 (off != rd[i].data_size) )
1297 GNUNET_break_op (0); /* record not well-formed */
1301 srv->domain_name = translate_dot_plus (rh, srv->domain_name);
1302 srv->target = translate_dot_plus (rh, srv->target);
1303 scratch_start = scratch_off;
1305 GNUNET_DNSPARSER_builder_add_srv (scratch,
1314 rd_new[rd_off].data = &scratch[scratch_start];
1315 rd_new[rd_off].data_size = scratch_off - scratch_start;
1320 GNUNET_DNSPARSER_free_srv (srv);
1323 case GNUNET_NAMESTORE_TYPE_PKEY:
1324 /* tigger shortening */
1325 if (NULL != rh->shorten_key)
1327 struct GNUNET_CRYPTO_EccPublicSignKey pub;
1329 if (rd[i].data_size != sizeof (struct GNUNET_CRYPTO_EccPublicSignKey))
1331 GNUNET_break_op (0);
1334 memcpy (&pub, rd[i].data, rd[i].data_size);
1335 GNS_shorten_start (rh->ac_tail->label,
1347 /* yes, we are done, return result */
1348 rh->proc (rh->proc_cls, rd_off, rd_new);
1349 GNS_resolver_lookup_cancel (rh);
1352 /* need to recurse, check if we can */
1353 for (i=0;i<rd_count;i++)
1355 switch (rd[i].record_type)
1357 case GNUNET_NAMESTORE_TYPE_PKEY:
1358 /* delegation to another zone */
1359 if (sizeof (struct GNUNET_CRYPTO_EccPublicSignKey) !=
1362 GNUNET_break_op (0);
1363 rh->proc (rh->proc_cls, 0, NULL);
1364 GNS_resolver_lookup_cancel (rh);
1367 /* expand authority chain */
1368 ac = GNUNET_new (struct AuthorityChain);
1370 ac->gns_authority = GNUNET_YES;
1371 memcpy (&ac->authority_info.gns_authority,
1373 sizeof (struct GNUNET_CRYPTO_EccPublicSignKey));
1374 ac->label = resolver_lookup_get_next_label (rh);
1375 /* tigger shortening */
1376 if (NULL != rh->shorten_key)
1377 GNS_shorten_start (rh->ac_tail->label,
1378 &ac->authority_info.gns_authority,
1380 /* add AC to tail */
1381 GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
1385 rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
1388 case GNUNET_DNSPARSER_TYPE_NS:
1389 /* resolution continues within DNS */
1390 if (GNUNET_DNSPARSER_MAX_NAME_LENGTH < rd[i].data_size)
1392 GNUNET_break_op (0);
1393 rh->proc (rh->proc_cls, 0, NULL);
1394 GNS_resolver_lookup_cancel (rh);
1397 /* find associated A/AAAA record */
1400 for (j=0;j<rd_count;j++)
1402 switch (rd[j].record_type)
1404 case GNUNET_DNSPARSER_TYPE_A:
1405 if (sizeof (struct in_addr) != rd[i].data_size)
1407 GNUNET_break_op (0);
1408 rh->proc (rh->proc_cls, 0, NULL);
1409 GNS_resolver_lookup_cancel (rh);
1412 /* FIXME: might want to check if we support IPv4 here,
1413 and otherwise skip this one and hope we find another */
1414 memset (&v4, 0, sizeof (v4));
1415 sa_len = sizeof (v4);
1416 v4.sin_family = AF_INET;
1417 v4.sin_port = htons (53);
1418 #if HAVE_SOCKADDR_IN_SIN_LEN
1419 v4.sin_len = (u_char) sa_len;
1421 memcpy (&v4.sin_addr,
1423 sizeof (struct in_addr));
1424 sa = (struct sockaddr *) &v4;
1426 case GNUNET_DNSPARSER_TYPE_AAAA:
1427 if (sizeof (struct in6_addr) != rd[i].data_size)
1429 GNUNET_break_op (0);
1430 rh->proc (rh->proc_cls, 0, NULL);
1431 GNS_resolver_lookup_cancel (rh);
1434 /* FIXME: might want to check if we support IPv6 here,
1435 and otherwise skip this one and hope we find another */
1436 memset (&v6, 0, sizeof (v6));
1437 sa_len = sizeof (v6);
1438 v6.sin6_family = AF_INET6;
1439 v6.sin6_port = htons (53);
1440 #if HAVE_SOCKADDR_IN_SIN_LEN
1441 v6.sin6_len = (u_char) sa_len;
1443 memcpy (&v6.sin6_addr,
1445 sizeof (struct in6_addr));
1446 sa = (struct sockaddr *) &v6;
1456 /* we cannot continue; NS without A/AAAA */
1457 rh->proc (rh->proc_cls, 0, NULL);
1458 GNS_resolver_lookup_cancel (rh);
1461 /* expand authority chain */
1462 ac = GNUNET_new (struct AuthorityChain);
1464 strncpy (ac->authority_info.dns_authority.name,
1467 ac->authority_info.dns_authority.name[rd[i].data_size] = '\0';
1468 memcpy (&ac->authority_info.dns_authority.dns_ip,
1471 /* for DNS recursion, the label is the full DNS name,
1472 created from the remainder of the GNS name and the
1473 name in the NS record */
1474 GNUNET_asprintf (&ac->label,
1476 (int) rh->name_resolution_pos,
1478 ac->authority_info.dns_authority.name);
1479 GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
1482 if (strlen (ac->label) > GNUNET_DNSPARSER_MAX_NAME_LENGTH)
1484 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1485 _("GNS lookup resulted in DNS name that is too long (`%s')\n"),
1487 rh->proc (rh->proc_cls, 0, NULL);
1488 GNS_resolver_lookup_cancel (rh);
1492 rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
1495 case GNUNET_DNSPARSER_TYPE_CNAME:
1496 cname = GNUNET_strndup (rd[i].data,
1498 handle_gns_cname_result (rh,
1500 GNUNET_free (cname);
1502 /* FIXME: handle DNAME */
1508 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1509 _("GNS lookup recursion failed (no delegation record found)\n"));
1510 rh->proc (rh->proc_cls, 0, NULL);
1511 GNS_resolver_lookup_cancel (rh);
1516 * Function called once the namestore has completed the request for
1519 * @param cls closure with the 'struct GNS_ResolverHandle'
1520 * @param success #GNUNET_OK on success
1521 * @param emsg error message
1524 namestore_cache_continuation (void *cls,
1528 struct GNS_ResolverHandle *rh = cls;
1530 rh->namestore_qe = NULL;
1532 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1533 _("Failed to cache GNS resolution: %s\n"),
1539 * Iterator called on each result obtained for a DHT
1540 * operation that expects a reply
1542 * @param cls closure with the `struct GNS_ResolverHandle`
1543 * @param exp when will this value expire
1544 * @param key key of the result
1545 * @param get_path peers on reply path (or NULL if not recorded)
1546 * [0] = datastore's first neighbor, [length - 1] = local peer
1547 * @param get_path_length number of entries in @a get_path
1548 * @param put_path peers on the PUT path (or NULL if not recorded)
1549 * [0] = origin, [length - 1] = datastore
1550 * @param put_path_length number of entries in @a get_path
1551 * @param type type of the result
1552 * @param size number of bytes in data
1553 * @param data pointer to the result data
1556 handle_dht_response (void *cls,
1557 struct GNUNET_TIME_Absolute exp,
1558 const struct GNUNET_HashCode *key,
1559 const struct GNUNET_PeerIdentity *get_path,
1560 unsigned int get_path_length,
1561 const struct GNUNET_PeerIdentity *put_path,
1562 unsigned int put_path_length,
1563 enum GNUNET_BLOCK_Type type,
1564 size_t size, const void *data)
1566 struct GNS_ResolverHandle *rh = cls;
1567 struct AuthorityChain *ac = rh->ac_tail;
1568 const struct GNUNET_NAMESTORE_Block *block;
1570 GNUNET_DHT_get_stop (rh->get_handle);
1571 rh->get_handle = NULL;
1572 GNUNET_CONTAINER_heap_remove_node (rh->dht_heap_node);
1573 rh->dht_heap_node = NULL;
1574 if (size < sizeof (struct GNUNET_NAMESTORE_Block))
1576 /* how did this pass DHT block validation!? */
1578 rh->proc (rh->proc_cls, 0, NULL);
1579 GNS_resolver_lookup_cancel (rh);
1584 ntohs (block->purpose.size) +
1585 sizeof (struct GNUNET_CRYPTO_EccPublicSignKey) +
1586 sizeof (struct GNUNET_CRYPTO_EccSignature))
1588 /* how did this pass DHT block validation!? */
1590 rh->proc (rh->proc_cls, 0, NULL);
1591 GNS_resolver_lookup_cancel (rh);
1595 GNUNET_NAMESTORE_block_decrypt (block,
1596 &ac->authority_info.gns_authority,
1598 &handle_gns_resolution_result,
1601 GNUNET_break_op (0); /* block was ill-formed */
1602 rh->proc (rh->proc_cls, 0, NULL);
1603 GNS_resolver_lookup_cancel (rh);
1606 /* Cache well-formed blocks */
1607 rh->namestore_qe = GNUNET_NAMESTORE_block_cache (namestore_handle,
1609 &namestore_cache_continuation,
1615 * Process a record that was stored in the namestore.
1617 * @param cls closure with the `struct GNS_ResolverHandle`
1618 * @param block block that was stored in the namestore
1621 handle_namestore_block_response (void *cls,
1622 const struct GNUNET_NAMESTORE_Block *block)
1624 struct GNS_ResolverHandle *rh = cls;
1625 struct GNS_ResolverHandle *rx;
1626 struct AuthorityChain *ac = rh->ac_tail;
1627 const char *label = ac->label;
1628 const struct GNUNET_CRYPTO_EccPublicSignKey *auth = &ac->authority_info.gns_authority;
1629 struct GNUNET_HashCode query;
1631 GNUNET_NAMESTORE_query_from_public_key (auth,
1634 rh->namestore_qe = NULL;
1635 if ( (GNUNET_NO == rh->only_cached) &&
1636 ( (NULL == block) ||
1637 (0 == GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (block->expiration_time)).rel_value_us) ) )
1639 /* Namestore knows nothing; try DHT lookup */
1640 rh->get_handle = GNUNET_DHT_get_start (dht_handle,
1641 GNUNET_BLOCK_TYPE_GNS_NAMERECORD,
1643 DHT_GNS_REPLICATION_LEVEL,
1644 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1646 &handle_dht_response, rh);
1647 rh->dht_heap_node = GNUNET_CONTAINER_heap_insert (dht_lookup_heap,
1649 GNUNET_TIME_absolute_get ().abs_value_us);
1650 if (GNUNET_CONTAINER_heap_get_size (dht_lookup_heap) > max_allowed_background_queries)
1652 /* fail longest-standing DHT request */
1653 rx = GNUNET_CONTAINER_heap_peek (dht_lookup_heap);
1654 GNUNET_assert (NULL != rx);
1655 rx->proc (rx->proc_cls, 0, NULL);
1656 GNS_resolver_lookup_cancel (rx);
1660 if ( (NULL == block) ||
1661 (0 == GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (block->expiration_time)).rel_value_us) )
1663 /* DHT not permitted and no local result, fail */
1664 rh->proc (rh->proc_cls, 0, NULL);
1665 GNS_resolver_lookup_cancel (rh);
1669 GNUNET_NAMESTORE_block_decrypt (block,
1672 &handle_gns_resolution_result,
1675 GNUNET_break_op (0); /* block was ill-formed */
1676 rh->proc (rh->proc_cls, 0, NULL);
1677 GNS_resolver_lookup_cancel (rh);
1684 * Lookup tail of our authority chain in the namestore.
1686 * @param rh query we are processing
1689 recursive_gns_resolution_namestore (struct GNS_ResolverHandle *rh)
1691 struct AuthorityChain *ac = rh->ac_tail;
1692 struct GNUNET_HashCode query;
1694 GNUNET_NAMESTORE_query_from_public_key (&ac->authority_info.gns_authority,
1697 rh->namestore_qe = GNUNET_NAMESTORE_lookup_block (namestore_handle,
1699 &handle_namestore_block_response,
1705 * Task scheduled to continue with the resolution process.
1707 * @param cls the `struct GNS_ResolverHandle` of the resolution
1708 * @param tc task context
1711 recursive_resolution (void *cls,
1712 const struct GNUNET_SCHEDULER_TaskContext *tc)
1714 struct GNS_ResolverHandle *rh = cls;
1716 rh->task_id = GNUNET_SCHEDULER_NO_TASK;
1717 if (MAX_RECURSION < rh->loop_limiter++)
1719 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1720 "Encountered unbounded recursion resolving `%s'\n",
1722 rh->proc (rh->proc_cls, 0, NULL);
1723 GNS_resolver_lookup_cancel (rh);
1726 if (GNUNET_YES == rh->ac_tail->gns_authority)
1727 recursive_gns_resolution_namestore (rh);
1729 recursive_dns_resolution (rh);
1734 * Begin the resolution process from 'name', starting with
1735 * the identification of the zone specified by 'name'.
1737 * @param rh resolution to perform
1740 start_resolver_lookup (struct GNS_ResolverHandle *rh)
1742 struct AuthorityChain *ac;
1747 if ( ( (GNUNET_YES == is_canonical (rh->name)) &&
1748 (0 != strcmp (GNUNET_GNS_TLD, rh->name)) ) ||
1749 ( (GNUNET_YES != is_gnu_tld (rh->name)) &&
1750 (GNUNET_YES != is_zkey_tld (rh->name)) ) )
1752 /* use standard DNS lookup */
1755 switch (rh->record_type)
1757 case GNUNET_DNSPARSER_TYPE_A:
1760 case GNUNET_DNSPARSER_TYPE_AAAA:
1767 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1768 "Doing standard DNS lookup for `%s'\n",
1770 rh->std_resolve = GNUNET_RESOLVER_ip_get (rh->name,
1777 if (is_zkey_tld (rh->name))
1779 /* Name ends with ".zkey", try to replace authority zone with zkey
1781 GNUNET_free (resolver_lookup_get_next_label (rh)); /* will return "zkey" */
1782 x = resolver_lookup_get_next_label (rh); /* will return 'x' coordinate */
1783 y = resolver_lookup_get_next_label (rh); /* will return 'y' coordinate */
1784 GNUNET_asprintf (&pkey,
1790 GNUNET_CRYPTO_ecc_public_sign_key_from_string (pkey,
1792 &rh->authority_zone)) )
1794 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1795 _("Hostname `%s' is not well-formed, resolution fails\n"),
1797 rh->task_id = GNUNET_SCHEDULER_add_now (&fail_resolution, rh);
1799 GNUNET_free_non_null (x);
1800 GNUNET_free_non_null (y);
1805 /* Name ends with ".gnu", eat ".gnu" and continue with resolution */
1806 GNUNET_free (resolver_lookup_get_next_label (rh));
1808 ac = GNUNET_new (struct AuthorityChain);
1810 ac->label = resolver_lookup_get_next_label (rh);
1811 if (NULL == ac->label)
1812 /* name was just "gnu", so we default to label '+' */
1813 ac->label = GNUNET_strdup (GNUNET_GNS_MASTERZONE_STR);
1814 ac->gns_authority = GNUNET_YES;
1815 ac->authority_info.gns_authority = rh->authority_zone;
1816 GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
1819 rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
1825 * Lookup of a record in a specific zone calls lookup result processor
1828 * @param zone the zone to perform the lookup in
1829 * @param record_type the record type to look up
1830 * @param name the name to look up
1831 * @param shorten_key a private key for use with PSEU import (can be NULL)
1832 * @param only_cached #GNUNET_NO to only check locally not DHT for performance
1833 * @param proc the processor to call on result
1834 * @param proc_cls the closure to pass to @a proc
1835 * @return handle to cancel operation
1837 struct GNS_ResolverHandle *
1838 GNS_resolver_lookup (const struct GNUNET_CRYPTO_EccPublicSignKey *zone,
1839 uint32_t record_type,
1841 const struct GNUNET_CRYPTO_EccPrivateKey *shorten_key,
1843 GNS_ResultProcessor proc, void *proc_cls)
1845 struct GNS_ResolverHandle *rh;
1847 rh = GNUNET_new (struct GNS_ResolverHandle);
1848 GNUNET_CONTAINER_DLL_insert (rlh_head,
1851 rh->authority_zone = *zone;
1853 rh->proc_cls = proc_cls;
1854 rh->only_cached = only_cached;
1855 rh->record_type = record_type;
1856 rh->name = GNUNET_strdup (name);
1857 rh->name_resolution_pos = strlen (name);
1858 if (NULL != shorten_key)
1860 rh->shorten_key = GNUNET_new (struct GNUNET_CRYPTO_EccPrivateKey);
1861 *rh->shorten_key = *shorten_key;
1863 start_resolver_lookup (rh);
1869 * Cancel active resolution (i.e. client disconnected).
1871 * @param rh resolution to abort
1874 GNS_resolver_lookup_cancel (struct GNS_ResolverHandle *rh)
1876 struct DnsResult *dr;
1877 struct AuthorityChain *ac;
1878 struct VpnContext *vpn_ctx;
1880 GNUNET_CONTAINER_DLL_remove (rlh_head,
1883 while (NULL != (ac = rh->ac_head))
1885 GNUNET_CONTAINER_DLL_remove (rh->ac_head,
1888 GNUNET_free (ac->label);
1891 if (GNUNET_SCHEDULER_NO_TASK != rh->task_id)
1893 GNUNET_SCHEDULER_cancel (rh->task_id);
1894 rh->task_id = GNUNET_SCHEDULER_NO_TASK;
1896 if (NULL != rh->get_handle)
1898 GNUNET_DHT_get_stop (rh->get_handle);
1899 rh->get_handle = NULL;
1901 if (NULL != rh->dht_heap_node)
1903 GNUNET_CONTAINER_heap_remove_node (rh->dht_heap_node);
1904 rh->dht_heap_node = NULL;
1906 if (NULL != (vpn_ctx = rh->vpn_ctx))
1908 GNUNET_VPN_cancel_request (vpn_ctx->vpn_request);
1909 GNUNET_free (vpn_ctx->rd_data);
1910 GNUNET_free (vpn_ctx);
1912 if (NULL != rh->dns_request)
1914 GNUNET_DNSSTUB_resolve_cancel (rh->dns_request);
1915 rh->dns_request = NULL;
1917 if (NULL != rh->namestore_qe)
1919 GNUNET_NAMESTORE_cancel (rh->namestore_qe);
1920 rh->namestore_qe = NULL;
1922 if (NULL != rh->std_resolve)
1924 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1925 "Canceling standard DNS resolution\n");
1926 GNUNET_RESOLVER_request_cancel (rh->std_resolve);
1927 rh->std_resolve = NULL;
1929 while (NULL != (dr = rh->dns_result_head))
1931 GNUNET_CONTAINER_DLL_remove (rh->dns_result_head,
1932 rh->dns_result_tail,
1936 GNUNET_free_non_null (rh->shorten_key);
1937 GNUNET_free (rh->name);
1942 /* ***************** Resolver initialization ********************* */
1946 * Initialize the resolver
1948 * @param nh the namestore handle
1949 * @param dht the dht handle
1950 * @param c configuration handle
1951 * @param max_bg_queries maximum number of parallel background queries in dht
1954 GNS_resolver_init (struct GNUNET_NAMESTORE_Handle *nh,
1955 struct GNUNET_DHT_Handle *dht,
1956 const struct GNUNET_CONFIGURATION_Handle *c,
1957 unsigned long long max_bg_queries)
1962 namestore_handle = nh;
1965 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1966 max_allowed_background_queries = max_bg_queries;
1968 GNUNET_CONFIGURATION_get_value_string (c,
1973 /* user did not specify DNS resolver, use 8.8.8.8 */
1974 dns_ip = GNUNET_strdup ("8.8.8.8");
1976 dns_handle = GNUNET_DNSSTUB_start (dns_ip);
1977 GNUNET_free (dns_ip);
1978 vpn_handle = GNUNET_VPN_connect (cfg);
1986 GNS_resolver_done ()
1988 struct GNS_ResolverHandle *rh;
1990 /* abort active resolutions */
1991 while (NULL != (rh = rlh_head))
1993 rh->proc (rh->proc_cls, 0, NULL);
1994 GNS_resolver_lookup_cancel (rh);
1996 GNUNET_CONTAINER_heap_destroy (dht_lookup_heap);
1997 dht_lookup_heap = NULL;
1998 GNUNET_DNSSTUB_stop (dns_handle);
2000 GNUNET_VPN_disconnect (vpn_handle);
2003 namestore_handle = NULL;
2007 /* *************** common helper functions (do not really belong here) *********** */
2010 * Checks if @a name ends in ".TLD"
2012 * @param name the name to check
2013 * @param tld the TLD to check for
2014 * @return GNUNET_YES or GNUNET_NO
2017 is_tld (const char* name, const char* tld)
2021 if (strlen (name) <= strlen (tld))
2023 offset = strlen (name) - strlen (tld);
2024 if (0 != strcmp (name + offset, tld))
2030 /* end of gnunet-service-gns_resolver.c */