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3 Copyright (C) 2009-2016 GNUnet e.V.
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
22 * @file util/resolver_api.c
23 * @brief resolver for writing a tool
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_protocols.h"
29 #include "gnunet_resolver_service.h"
32 #define LOG(kind,...) GNUNET_log_from (kind, "util-resolver-api", __VA_ARGS__)
34 #define LOG_STRERROR(kind,syscall) GNUNET_log_from_strerror (kind, "util-resolver-api", syscall)
37 * Maximum supported length for a hostname
39 #define MAX_HOSTNAME 1024
43 * Possible hostnames for "loopback".
45 static const char *loopback[] = {
55 static const struct GNUNET_CONFIGURATION_Handle *resolver_cfg;
58 * Our connection to the resolver service, created on-demand, but then
59 * persists until error or shutdown.
61 static struct GNUNET_MQ_Handle *mq;
64 * Head of DLL of requests.
66 static struct GNUNET_RESOLVER_RequestHandle *req_head;
69 * Tail of DLL of requests.
71 static struct GNUNET_RESOLVER_RequestHandle *req_tail;
74 * How long should we wait to reconnect?
76 static struct GNUNET_TIME_Relative backoff;
79 * Task for reconnecting.
81 static struct GNUNET_SCHEDULER_Task *r_task;
84 * Task ID of shutdown task; only present while we have a
85 * connection to the resolver service.
87 static struct GNUNET_SCHEDULER_Task *s_task;
91 * Handle to a request given to the resolver. Can be used to cancel
92 * the request prior to the timeout or successful execution. Also
93 * used to track our internal state for the request.
95 struct GNUNET_RESOLVER_RequestHandle
99 * Next entry in DLL of requests.
101 struct GNUNET_RESOLVER_RequestHandle *next;
104 * Previous entry in DLL of requests.
106 struct GNUNET_RESOLVER_RequestHandle *prev;
109 * Callback if this is an name resolution request,
112 GNUNET_RESOLVER_AddressCallback addr_callback;
115 * Callback if this is a reverse lookup request,
118 GNUNET_RESOLVER_HostnameCallback name_callback;
121 * Closure for the callbacks.
126 * When should this request time out?
128 struct GNUNET_TIME_Absolute timeout;
131 * Task handle for making reply callbacks in numeric lookups
132 * asynchronous, and for timeout handling.
134 struct GNUNET_SCHEDULER_Task *task;
137 * Desired address family.
142 * Has this request been transmitted to the service?
143 * #GNUNET_YES if transmitted
144 * #GNUNET_YES if not transmitted
145 * #GNUNET_SYSERR when request was canceled
150 * Did we add this request to the queue?
155 * Desired direction (IP to name or name to IP)
160 * #GNUNET_YES if a response was received
162 int received_response;
165 * Length of the data that follows this struct.
172 * Check that the resolver service runs on localhost
175 * @return #GNUNET_OK if the resolver is properly configured,
176 * #GNUNET_SYSERR otherwise.
182 struct sockaddr_in v4;
183 struct sockaddr_in6 v6;
185 memset (&v4, 0, sizeof (v4));
186 v4.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
187 v4.sin_family = AF_INET;
188 #if HAVE_SOCKADDR_IN_SIN_LEN
189 v4.sin_len = sizeof (v4);
191 memset (&v6, 0, sizeof (v6));
192 v6.sin6_family = AF_INET6;
193 #if HAVE_SOCKADDR_IN_SIN_LEN
194 v6.sin6_len = sizeof (v6);
197 GNUNET_CONFIGURATION_get_value_string (resolver_cfg,
202 LOG (GNUNET_ERROR_TYPE_INFO,
203 _("Missing `%s' for `%s' in configuration, DNS resolution will be unavailable.\n"),
206 return GNUNET_SYSERR;
208 if ( (1 == inet_pton (AF_INET, hostname, &v4)) ||
209 (1 == inet_pton (AF_INET6, hostname, &v6)) )
211 GNUNET_free (hostname);
214 for (unsigned int i = 0;
217 if (0 == strcasecmp (loopback[i], hostname))
219 GNUNET_free (hostname);
222 LOG (GNUNET_ERROR_TYPE_INFO,
223 _("Missing `%s' or numeric IP address for `%s' of `%s' in configuration, DNS resolution will be unavailable.\n"),
227 GNUNET_free (hostname);
228 return GNUNET_SYSERR;
233 * Create the connection to the resolver service.
235 * @param cfg configuration to use
238 GNUNET_RESOLVER_connect (const struct GNUNET_CONFIGURATION_Handle *cfg)
240 GNUNET_assert (NULL != cfg);
241 backoff = GNUNET_TIME_UNIT_MILLISECONDS;
247 * Destroy the connection to the resolver service.
250 GNUNET_RESOLVER_disconnect ()
252 struct GNUNET_RESOLVER_RequestHandle *rh;
254 while (NULL != (rh = req_head))
256 GNUNET_assert (GNUNET_SYSERR == rh->was_transmitted);
257 GNUNET_CONTAINER_DLL_remove (req_head,
264 LOG (GNUNET_ERROR_TYPE_DEBUG,
265 "Disconnecting from DNS service\n");
266 GNUNET_MQ_destroy (mq);
271 GNUNET_SCHEDULER_cancel (r_task);
276 GNUNET_SCHEDULER_cancel (s_task);
283 * Task executed on system shutdown.
286 shutdown_task (void *cls)
289 GNUNET_RESOLVER_disconnect ();
290 backoff = GNUNET_TIME_UNIT_MILLISECONDS;
295 * Consider disconnecting if we have no further requests pending.
300 for (struct GNUNET_RESOLVER_RequestHandle *rh = req_head;
303 if (GNUNET_SYSERR != rh->was_transmitted)
307 GNUNET_SCHEDULER_cancel (r_task);
312 s_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MILLISECONDS,
319 * Convert IP address to string without DNS resolution.
321 * @param af address family
322 * @param ip the address
323 * @param ip_len number of bytes in @a ip
324 * @return address as a string, NULL on error
331 char buf[INET6_ADDRSTRLEN];
336 if (ip_len != sizeof (struct in_addr))
344 LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING,
350 if (ip_len != sizeof (struct in6_addr))
358 LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING,
367 return GNUNET_strdup (buf);
372 * Adjust exponential back-off and reconnect to the service.
379 * Generic error handler, called with the appropriate error code and
380 * the same closure specified at the creation of the message queue.
381 * Not every message queue implementation supports an error handler.
384 * @param error error code
387 mq_error_handler (void *cls,
388 enum GNUNET_MQ_Error error)
390 GNUNET_MQ_destroy (mq);
392 LOG (GNUNET_ERROR_TYPE_DEBUG,
393 "MQ error, reconnecting\n");
399 * Process pending requests to the resolver.
404 struct GNUNET_RESOLVER_GetMessage *msg;
405 struct GNUNET_MQ_Envelope *env;
406 struct GNUNET_RESOLVER_RequestHandle *rh = req_head;
415 /* nothing to do, release socket really soon if there is nothing
416 * else happening... */
418 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MILLISECONDS,
423 if (GNUNET_NO != rh->was_transmitted)
424 return; /* waiting for reply */
425 env = GNUNET_MQ_msg_extra (msg,
427 GNUNET_MESSAGE_TYPE_RESOLVER_REQUEST);
428 msg->direction = htonl (rh->direction);
429 msg->af = htonl (rh->af);
430 GNUNET_memcpy (&msg[1],
433 LOG (GNUNET_ERROR_TYPE_DEBUG,
434 "Transmitting DNS resolution request to DNS service\n");
437 rh->was_transmitted = GNUNET_YES;
442 * Check validity of response with a hostname for a DNS lookup.
445 * @param msg message with the hostname
448 check_response (void *cls,
449 const struct GNUNET_MessageHeader *msg)
451 /* implemented in #handle_response() for now */
457 * Check validity of response with a hostname for a DNS lookup.
458 * NOTE: right now rather messy, might want to use different
459 * message types for different response formats in the future.
462 * @param msg message with the response
465 handle_response (void *cls,
466 const struct GNUNET_MessageHeader *msg)
468 struct GNUNET_RESOLVER_RequestHandle *rh = req_head;
472 size = ntohs (msg->size);
473 if (size == sizeof (struct GNUNET_MessageHeader))
475 LOG (GNUNET_ERROR_TYPE_DEBUG,
476 "Received empty response from DNS service\n");
477 /* message contains not data, just header; end of replies */
478 /* check if request was canceled */
479 if (GNUNET_SYSERR != rh->was_transmitted)
481 /* no reverse lookup was successful, return IP as string */
482 if (NULL != rh->name_callback)
484 if (GNUNET_NO == rh->received_response)
486 nret = no_resolve (rh->af,
489 rh->name_callback (rh->cls, nret);
492 /* finally, make termination call */
493 rh->name_callback (rh->cls,
496 if (NULL != rh->addr_callback)
497 rh->addr_callback (rh->cls,
501 rh->was_transmitted = GNUNET_NO;
502 GNUNET_RESOLVER_request_cancel (rh);
506 /* return reverse lookup results to caller */
507 if (NULL != rh->name_callback)
509 const char *hostname;
511 hostname = (const char *) &msg[1];
512 if (hostname[size - sizeof (struct GNUNET_MessageHeader) - 1] != '\0')
515 if (GNUNET_SYSERR != rh->was_transmitted)
516 rh->name_callback (rh->cls,
518 rh->was_transmitted = GNUNET_NO;
519 GNUNET_RESOLVER_request_cancel (rh);
520 GNUNET_MQ_destroy (mq);
525 LOG (GNUNET_ERROR_TYPE_DEBUG,
526 "Resolver returns `%s' for IP `%s'.\n",
528 GNUNET_a2s ((const void *) &rh[1],
530 if (rh->was_transmitted != GNUNET_SYSERR)
531 rh->name_callback (rh->cls,
533 rh->received_response = GNUNET_YES;
535 /* return lookup results to caller */
536 if (NULL != rh->addr_callback)
538 struct sockaddr_in v4;
539 struct sockaddr_in6 v6;
540 const struct sockaddr *sa;
546 ip_len = size - sizeof (struct GNUNET_MessageHeader);
547 if (ip_len == sizeof (struct in_addr))
549 memset (&v4, 0, sizeof (v4));
550 v4.sin_family = AF_INET;
551 v4.sin_addr = *(struct in_addr*) ip;
552 #if HAVE_SOCKADDR_IN_SIN_LEN
553 v4.sin_len = sizeof (v4);
556 sa = (const struct sockaddr *) &v4;
558 else if (ip_len == sizeof (struct in6_addr))
560 memset (&v6, 0, sizeof (v6));
561 v6.sin6_family = AF_INET6;
562 v6.sin6_addr = *(struct in6_addr*) ip;
563 #if HAVE_SOCKADDR_IN_SIN_LEN
564 v6.sin6_len = sizeof (v6);
567 sa = (const struct sockaddr *) &v6;
572 if (GNUNET_SYSERR != rh->was_transmitted)
573 rh->addr_callback (rh->cls,
576 rh->was_transmitted = GNUNET_NO;
577 GNUNET_RESOLVER_request_cancel (rh);
578 GNUNET_MQ_destroy (mq);
583 LOG (GNUNET_ERROR_TYPE_DEBUG,
584 "Received IP from DNS service\n");
585 if (GNUNET_SYSERR != rh->was_transmitted)
586 rh->addr_callback (rh->cls,
594 * We've been asked to lookup the address for a hostname and were
595 * given a valid numeric string. Perform the callbacks for the
598 * @param cls `struct GNUNET_RESOLVER_RequestHandle` for the request
601 numeric_resolution (void *cls)
603 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
604 struct sockaddr_in v4;
605 struct sockaddr_in6 v6;
606 const char *hostname;
609 memset (&v4, 0, sizeof (v4));
610 v4.sin_family = AF_INET;
611 #if HAVE_SOCKADDR_IN_SIN_LEN
612 v4.sin_len = sizeof (v4);
614 memset (&v6, 0, sizeof (v6));
615 v6.sin6_family = AF_INET6;
616 #if HAVE_SOCKADDR_IN_SIN_LEN
617 v6.sin6_len = sizeof (v6);
619 hostname = (const char *) &rh[1];
620 if ( ( (rh->af == AF_UNSPEC) ||
621 (rh->af == AF_INET) ) &&
622 (1 == inet_pton (AF_INET,
626 rh->addr_callback (rh->cls,
627 (const struct sockaddr *) &v4,
629 if ( (rh->af == AF_UNSPEC) &&
630 (1 == inet_pton (AF_INET6,
634 /* this can happen on some systems IF "hostname" is "localhost" */
635 rh->addr_callback (rh->cls,
636 (const struct sockaddr *) &v6,
639 rh->addr_callback (rh->cls,
645 if ( ( (rh->af == AF_UNSPEC) ||
646 (rh->af == AF_INET6) ) &&
647 (1 == inet_pton (AF_INET6,
651 rh->addr_callback (rh->cls,
652 (const struct sockaddr *) &v6,
654 rh->addr_callback (rh->cls,
660 /* why are we here? this task should not have been scheduled! */
667 * We've been asked to lookup the address for a hostname and were
668 * given a variant of "loopback". Perform the callbacks for the
669 * respective loopback numeric addresses.
671 * @param cls `struct GNUNET_RESOLVER_RequestHandle` for the request
674 loopback_resolution (void *cls)
676 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
677 struct sockaddr_in v4;
678 struct sockaddr_in6 v6;
681 memset (&v4, 0, sizeof (v4));
682 v4.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
683 v4.sin_family = AF_INET;
684 #if HAVE_SOCKADDR_IN_SIN_LEN
685 v4.sin_len = sizeof (v4);
687 memset (&v6, 0, sizeof (v6));
688 v6.sin6_family = AF_INET6;
689 #if HAVE_SOCKADDR_IN_SIN_LEN
690 v6.sin6_len = sizeof (v6);
692 v6.sin6_addr = in6addr_loopback;
696 rh->addr_callback (rh->cls,
697 (const struct sockaddr *) &v4,
701 rh->addr_callback (rh->cls,
702 (const struct sockaddr *) &v6,
706 rh->addr_callback (rh->cls,
707 (const struct sockaddr *) &v6,
709 rh->addr_callback (rh->cls,
710 (const struct sockaddr *) &v4,
718 rh->addr_callback (rh->cls,
721 LOG (GNUNET_ERROR_TYPE_DEBUG,
722 "Finished resolving hostname `%s'.\n",
723 (const char *) &rh[1]);
729 * Now try to reconnect to the resolver service.
734 reconnect_task (void *cls)
736 struct GNUNET_MQ_MessageHandler handlers[] = {
737 GNUNET_MQ_hd_var_size (response,
738 GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE,
739 struct GNUNET_MessageHeader,
741 GNUNET_MQ_handler_end ()
745 if (NULL == req_head)
746 return; /* no work pending */
747 LOG (GNUNET_ERROR_TYPE_DEBUG,
748 "Trying to connect to DNS service\n");
749 mq = GNUNET_CLIENT_connect (resolver_cfg,
756 LOG (GNUNET_ERROR_TYPE_DEBUG,
757 "Failed to connect, will try again later\n");
766 * Adjust exponential back-off and reconnect to the service.
771 struct GNUNET_RESOLVER_RequestHandle *rh;
775 GNUNET_assert (NULL == mq);
776 if (NULL != (rh = req_head))
778 switch (rh->was_transmitted)
781 /* nothing more to do */
784 /* disconnected, transmit again! */
785 rh->was_transmitted = GNUNET_NO;
788 /* request was cancelled, remove entirely */
789 GNUNET_CONTAINER_DLL_remove (req_head,
800 LOG (GNUNET_ERROR_TYPE_DEBUG,
801 "Will try to connect to DNS service in %s\n",
802 GNUNET_STRINGS_relative_time_to_string (backoff,
804 GNUNET_assert (NULL != resolver_cfg);
805 r_task = GNUNET_SCHEDULER_add_delayed (backoff,
808 backoff = GNUNET_TIME_STD_BACKOFF (backoff);
813 * A DNS resolution timed out. Notify the application.
815 * @param cls the `struct GNUNET_RESOLVER_RequestHandle *`
818 handle_lookup_timeout (void *cls)
820 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
823 if (GNUNET_NO == rh->direction)
825 LOG (GNUNET_ERROR_TYPE_INFO,
826 _("Timeout trying to resolve hostname `%s'.\n"),
827 (const char *) &rh[1]);
828 if (NULL != rh->addr_callback)
829 rh->addr_callback (rh->cls,
835 #if !defined(GNUNET_CULL_LOGGING)
836 char buf[INET6_ADDRSTRLEN];
838 LOG (GNUNET_ERROR_TYPE_INFO,
839 _("Timeout trying to resolve IP address `%s'.\n"),
841 (const void *) &rh[1],
845 if (GNUNET_NO == rh->received_response)
849 nret = no_resolve (rh->af,
852 if (NULL != rh->name_callback)
853 rh->name_callback (rh->cls, nret);
856 /* finally, make termination call */
857 if (NULL != rh->name_callback)
858 rh->name_callback (rh->cls,
861 rh->was_transmitted = GNUNET_NO;
862 GNUNET_RESOLVER_request_cancel (rh);
868 * Convert a string to one or more IP addresses.
870 * @param hostname the hostname to resolve
871 * @param af AF_INET or AF_INET6; use AF_UNSPEC for "any"
872 * @param callback function to call with addresses
873 * @param callback_cls closure for @a callback
874 * @param timeout how long to try resolving
875 * @return handle that can be used to cancel the request, NULL on error
877 struct GNUNET_RESOLVER_RequestHandle *
878 GNUNET_RESOLVER_ip_get (const char *hostname,
880 struct GNUNET_TIME_Relative timeout,
881 GNUNET_RESOLVER_AddressCallback callback,
884 struct GNUNET_RESOLVER_RequestHandle *rh;
889 slen = strlen (hostname) + 1;
890 if (slen + sizeof (struct GNUNET_RESOLVER_GetMessage) >=
891 GNUNET_MAX_MESSAGE_SIZE)
896 LOG (GNUNET_ERROR_TYPE_DEBUG,
897 "Trying to resolve hostname `%s'.\n",
899 rh = GNUNET_malloc (sizeof (struct GNUNET_RESOLVER_RequestHandle) + slen);
901 rh->addr_callback = callback;
902 rh->cls = callback_cls;
903 GNUNET_memcpy (&rh[1],
907 rh->timeout = GNUNET_TIME_relative_to_absolute (timeout);
908 rh->direction = GNUNET_NO;
909 /* first, check if this is a numeric address */
910 if ( ( (1 == inet_pton (AF_INET,
914 (af == AF_UNSPEC) ) ) ||
915 ( (1 == inet_pton (AF_INET6,
918 ( (af == AF_INET6) ||
919 (af == AF_UNSPEC)) ) )
921 rh->task = GNUNET_SCHEDULER_add_now (&numeric_resolution,
925 /* then, check if this is a loopback address */
926 for (unsigned int i = 0;
929 if (0 == strcasecmp (loopback[i],
932 rh->task = GNUNET_SCHEDULER_add_now (&loopback_resolution,
936 if (GNUNET_OK != check_config ())
941 rh->task = GNUNET_SCHEDULER_add_delayed (timeout,
942 &handle_lookup_timeout,
944 GNUNET_CONTAINER_DLL_insert_tail (req_head,
947 rh->was_queued = GNUNET_YES;
950 GNUNET_SCHEDULER_cancel (s_task);
959 * We've been asked to convert an address to a string without
960 * a reverse lookup, either because the client asked for it
961 * or because the DNS lookup hit a timeout. Do the numeric
962 * conversion and invoke the callback.
964 * @param cls `struct GNUNET_RESOLVER_RequestHandle` for the request
967 numeric_reverse (void *cls)
969 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
973 result = no_resolve (rh->af,
976 LOG (GNUNET_ERROR_TYPE_DEBUG,
977 "Resolver returns `%s'.\n",
981 rh->name_callback (rh->cls,
983 GNUNET_free (result);
985 rh->name_callback (rh->cls,
987 if (NULL != rh->task)
989 GNUNET_SCHEDULER_cancel (rh->task);
997 * Get an IP address as a string.
999 * @param sa host address
1000 * @param salen length of host address in @a sa
1001 * @param do_resolve use #GNUNET_NO to return numeric hostname
1002 * @param timeout how long to try resolving
1003 * @param callback function to call with hostnames
1004 * last callback is NULL when finished
1005 * @param cls closure for @a callback
1006 * @return handle that can be used to cancel the request
1008 struct GNUNET_RESOLVER_RequestHandle *
1009 GNUNET_RESOLVER_hostname_get (const struct sockaddr *sa,
1012 struct GNUNET_TIME_Relative timeout,
1013 GNUNET_RESOLVER_HostnameCallback callback,
1016 struct GNUNET_RESOLVER_RequestHandle *rh;
1020 if (GNUNET_OK != check_config ())
1022 LOG (GNUNET_ERROR_TYPE_ERROR,
1023 _("Resolver not configured correctly.\n"));
1027 switch (sa->sa_family)
1030 GNUNET_assert (salen == sizeof (struct sockaddr_in));
1031 ip_len = sizeof (struct in_addr);
1032 ip = &((const struct sockaddr_in*)sa)->sin_addr;
1035 GNUNET_assert (salen == sizeof (struct sockaddr_in6));
1036 ip_len = sizeof (struct in6_addr);
1037 ip = &((const struct sockaddr_in6*)sa)->sin6_addr;
1043 rh = GNUNET_malloc (sizeof (struct GNUNET_RESOLVER_RequestHandle) + salen);
1044 rh->name_callback = callback;
1046 rh->af = sa->sa_family;
1047 rh->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1048 GNUNET_memcpy (&rh[1],
1051 rh->data_len = ip_len;
1052 rh->direction = GNUNET_YES;
1053 rh->received_response = GNUNET_NO;
1054 if (GNUNET_NO == do_resolve)
1056 rh->task = GNUNET_SCHEDULER_add_now (&numeric_reverse,
1060 rh->task = GNUNET_SCHEDULER_add_delayed (timeout,
1061 &handle_lookup_timeout,
1063 GNUNET_CONTAINER_DLL_insert_tail (req_head,
1066 rh->was_queued = GNUNET_YES;
1069 GNUNET_SCHEDULER_cancel (s_task);
1072 process_requests ();
1078 * Get local fully qualified af name
1083 GNUNET_RESOLVER_local_fqdn_get ()
1085 char hostname[GNUNET_OS_get_hostname_max_length () + 1];
1087 if (0 != gethostname (hostname,
1088 sizeof (hostname) - 1))
1090 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
1094 LOG (GNUNET_ERROR_TYPE_DEBUG,
1095 "Resolving our FQDN `%s'\n",
1097 #if HAVE_GETADDRINFO
1099 struct addrinfo *ai;
1103 if (0 != (ret = getaddrinfo (hostname,
1108 LOG (GNUNET_ERROR_TYPE_ERROR,
1109 _("Could not resolve our FQDN: %s\n"),
1110 gai_strerror (ret));
1113 if (NULL != ai->ai_canonname)
1114 rval = GNUNET_strdup (ai->ai_canonname);
1116 rval = GNUNET_strdup (hostname);
1120 #elif HAVE_GETHOSTBYNAME2
1122 struct hostent *host;
1124 host = gethostbyname2 (hostname,
1127 host = gethostbyname2 (hostname,
1131 LOG (GNUNET_ERROR_TYPE_ERROR,
1132 _("Could not resolve our FQDN: %s\n"),
1133 hstrerror (h_errno));
1136 return GNUNET_strdup (host->h_name);
1138 #elif HAVE_GETHOSTBYNAME
1140 struct hostent *host;
1142 host = gethostbyname (hostname);
1145 LOG (GNUNET_ERROR_TYPE_ERROR,
1146 _("Could not resolve our FQDN: %s\n"),
1147 hstrerror (h_errno));
1150 return GNUNET_strdup (host->h_name);
1153 /* fallback: just hope name is already FQDN */
1154 return GNUNET_strdup (hostname);
1160 * Looking our own hostname.
1162 * @param af AF_INET or AF_INET6; use AF_UNSPEC for "any"
1163 * @param timeout how long to try resolving
1164 * @param callback function to call with addresses
1165 * @param cls closure for @a callback
1166 * @return handle that can be used to cancel the request, NULL on error
1168 struct GNUNET_RESOLVER_RequestHandle *
1169 GNUNET_RESOLVER_hostname_resolve (int af,
1170 struct GNUNET_TIME_Relative timeout,
1171 GNUNET_RESOLVER_AddressCallback callback,
1174 char hostname[GNUNET_OS_get_hostname_max_length () + 1];
1176 if (0 != gethostname (hostname, sizeof (hostname) - 1))
1178 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
1182 LOG (GNUNET_ERROR_TYPE_DEBUG,
1183 "Resolving our hostname `%s'\n",
1185 return GNUNET_RESOLVER_ip_get (hostname,
1194 * Cancel a request that is still pending with the resolver.
1195 * Note that a client MUST NOT cancel a request that has
1196 * been completed (i.e, the callback has been called to
1197 * signal timeout or the final result).
1199 * @param rh handle of request to cancel
1202 GNUNET_RESOLVER_request_cancel (struct GNUNET_RESOLVER_RequestHandle *rh)
1204 if (GNUNET_NO == rh->direction)
1205 LOG (GNUNET_ERROR_TYPE_DEBUG,
1206 "Asked to cancel request to resolve hostname `%s'.\n",
1207 (const char *) &rh[1]);
1208 if (NULL != rh->task)
1210 GNUNET_SCHEDULER_cancel (rh->task);
1213 if (GNUNET_NO == rh->was_transmitted)
1215 if (GNUNET_YES == rh->was_queued)
1216 GNUNET_CONTAINER_DLL_remove (req_head,
1220 check_disconnect ();
1223 GNUNET_assert (GNUNET_YES == rh->was_transmitted);
1224 rh->was_transmitted = GNUNET_SYSERR; /* mark as cancelled */
1225 check_disconnect ();
1229 /* end of resolver_api.c */