2 This file is part of GNUnet.
3 (C) 2009, 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
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., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file util/resolver_api.c
23 * @brief resolver for writing a tool
24 * @author Christian Grothoff
27 #include "gnunet_getopt_lib.h"
28 #include "gnunet_os_lib.h"
29 #include "gnunet_client_lib.h"
30 #include "gnunet_container_lib.h"
31 #include "gnunet_protocols.h"
32 #include "gnunet_resolver_service.h"
33 #include "gnunet_server_lib.h"
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 *cfg;
58 * Our connection to the resolver service, created on-demand, but then
59 * persists until error or shutdown.
61 static struct GNUNET_CLIENT_Connection *client;
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 GNUNET_SCHEDULER_TaskIdentifier r_task;
84 * Task ID of shutdown task; only present while we have a
85 * connection to the resolver service.
87 static GNUNET_SCHEDULER_TaskIdentifier 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 respective "callback".
126 * When should this request time out?
128 struct GNUNET_TIME_Absolute timeout;
131 * Task handle for numeric lookups.
133 GNUNET_SCHEDULER_TaskIdentifier task;
136 * Desired address family.
141 * Has this request been transmitted to the service?
142 * GNUNET_YES if transmitted
143 * GNUNET_YES if not transmitted
144 * GNUNET_SYSERR when request was canceled
149 * Did we add this request to the queue?
154 * Desired direction (IP to name or name to IP)
159 * GNUNET_YES if a response was received
161 int received_response;
164 * Length of the data that follows this struct.
171 * Check that the resolver service runs on localhost
175 check_config (const struct GNUNET_CONFIGURATION_Handle *cfg)
179 struct sockaddr_in v4;
180 struct sockaddr_in6 v6;
182 memset (&v4, 0, sizeof (v4));
183 v4.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
184 v4.sin_family = AF_INET;
185 #if HAVE_SOCKADDR_IN_SIN_LEN
186 v4.sin_len = sizeof (v4);
188 memset (&v6, 0, sizeof (v6));
189 v6.sin6_family = AF_INET6;
190 #if HAVE_SOCKADDR_IN_SIN_LEN
191 v6.sin6_len = sizeof (v6);
194 GNUNET_CONFIGURATION_get_value_string (cfg, "resolver", "HOSTNAME",
197 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
198 _("Must specify `%s' for `%s' in configuration!\n"), "HOSTNAME",
202 if ((1 != inet_pton (AF_INET, hostname, &v4)) ||
203 (1 != inet_pton (AF_INET6, hostname, &v6)))
205 GNUNET_free (hostname);
209 while (loopback[i] != NULL)
210 if (0 == strcasecmp (loopback[i++], hostname))
212 GNUNET_free (hostname);
215 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
217 ("Must specify `%s' or numeric IP address for `%s' of `%s' in configuration!\n"),
218 "localhost", "HOSTNAME", "resolver");
219 GNUNET_free (hostname);
225 * Create the connection to the resolver service.
227 * @param c configuration to use
230 GNUNET_RESOLVER_connect (const struct GNUNET_CONFIGURATION_Handle *c)
232 GNUNET_assert (NULL != c);
234 backoff = GNUNET_TIME_UNIT_MILLISECONDS;
240 * Destroy the connection to the resolver service.
243 GNUNET_RESOLVER_disconnect ()
245 GNUNET_assert (NULL == req_head);
246 GNUNET_assert (NULL == req_tail);
250 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting from DNS service\n");
252 GNUNET_CLIENT_disconnect (client, GNUNET_NO);
255 if (r_task != GNUNET_SCHEDULER_NO_TASK)
257 GNUNET_SCHEDULER_cancel (r_task);
258 r_task = GNUNET_SCHEDULER_NO_TASK;
260 if (s_task != GNUNET_SCHEDULER_NO_TASK)
262 GNUNET_SCHEDULER_cancel (s_task);
263 s_task = GNUNET_SCHEDULER_NO_TASK;
269 * Convert IP address to string without DNS resolution.
271 * @param sa the address
272 * @param salen number of bytes in sa
273 * @return address as a string, NULL on error
276 no_resolve (const struct sockaddr *sa, socklen_t salen)
279 char inet4[INET_ADDRSTRLEN];
280 char inet6[INET6_ADDRSTRLEN];
282 if (salen < sizeof (struct sockaddr))
284 switch (sa->sa_family)
287 if (salen != sizeof (struct sockaddr_in))
290 inet_ntop (AF_INET, &((struct sockaddr_in *) sa)->sin_addr, inet4,
293 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
296 ret = GNUNET_strdup (inet4);
299 if (salen != sizeof (struct sockaddr_in6))
302 inet_ntop (AF_INET6, &((struct sockaddr_in6 *) sa)->sin6_addr, inet6,
305 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
308 ret = GNUNET_strdup (inet6);
319 * Adjust exponential back-off and reconnect to the service.
326 * Process pending requests to the resolver.
328 * @param h handle to the resolver
335 * Process response with a hostname for a DNS lookup.
337 * @param cls our "struct GNUNET_RESOLVER_RequestHandle" context
338 * @param msg message with the hostname, NULL on error
341 handle_response (void *cls, const struct GNUNET_MessageHeader *msg)
343 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
345 const char *hostname;
346 const struct sockaddr *sa;
350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Receiving response from DNS service\n");
354 if (NULL != rh->name_callback)
355 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
356 _("Timeout trying to resolve IP address `%s'.\n"),
357 GNUNET_a2s ((const void *) &rh[1], rh->data_len));
359 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
360 _("Timeout trying to resolve hostname `%s'.\n"),
361 (const char *) &rh[1]);
362 /* check if request was canceled */
363 if (rh->was_transmitted != GNUNET_SYSERR)
365 if (NULL != rh->name_callback)
367 /* no reverse lookup was successful, return ip as string */
368 if (rh->received_response == GNUNET_NO)
369 rh->name_callback (rh->cls,
370 no_resolve ((const struct sockaddr *) &rh[1],
372 /* at least one reverse lookup was successful */
374 rh->name_callback (rh->cls, NULL);
376 if (NULL != rh->addr_callback)
377 rh->addr_callback (rh->cls, NULL, 0);
379 GNUNET_CONTAINER_DLL_remove (req_head, req_tail, rh);
381 GNUNET_CLIENT_disconnect (client, GNUNET_NO);
386 if (GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE != ntohs (msg->type))
389 GNUNET_CLIENT_disconnect (client, GNUNET_NO);
394 size = ntohs (msg->size);
395 /* message contains not data, just header */
396 if (size == sizeof (struct GNUNET_MessageHeader))
398 /* check if request was canceled */
399 if (rh->was_transmitted != GNUNET_SYSERR)
401 if (NULL != rh->name_callback)
402 rh->name_callback (rh->cls, NULL);
403 if (NULL != rh->addr_callback)
404 rh->addr_callback (rh->cls, NULL, 0);
406 GNUNET_CONTAINER_DLL_remove (req_head, req_tail, rh);
411 /* return reverse lookup results to caller */
412 if (NULL != rh->name_callback)
414 hostname = (const char *) &msg[1];
415 if (hostname[size - sizeof (struct GNUNET_MessageHeader) - 1] != '\0')
418 if (rh->was_transmitted != GNUNET_SYSERR)
419 rh->name_callback (rh->cls, NULL);
420 GNUNET_CONTAINER_DLL_remove (req_head, req_tail, rh);
422 GNUNET_CLIENT_disconnect (client, GNUNET_NO);
428 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
429 _("Resolver returns `%s' for IP `%s'.\n"), hostname,
430 GNUNET_a2s ((const void *) &rh[1], rh->data_len));
432 if (rh->was_transmitted != GNUNET_SYSERR)
433 rh->name_callback (rh->cls, hostname);
434 rh->received_response = GNUNET_YES;
435 GNUNET_CLIENT_receive (client, &handle_response, rh,
436 GNUNET_TIME_absolute_get_remaining (rh->timeout));
438 /* return lookup results to caller */
439 if (NULL != rh->addr_callback)
441 sa = (const struct sockaddr *) &msg[1];
442 salen = size - sizeof (struct GNUNET_MessageHeader);
443 if (salen < sizeof (struct sockaddr))
446 if (rh->was_transmitted != GNUNET_SYSERR)
447 rh->addr_callback (rh->cls, NULL, 0);
448 GNUNET_CONTAINER_DLL_remove (req_head, req_tail, rh);
450 GNUNET_CLIENT_disconnect (client, GNUNET_NO);
457 char *ips = no_resolve (sa, salen);
459 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Resolver returns `%s' for `%s'.\n",
460 ips, (const char *) &rh[1]);
464 rh->addr_callback (rh->cls, sa, salen);
465 GNUNET_CLIENT_receive (client, &handle_response, rh,
466 GNUNET_TIME_absolute_get_remaining (rh->timeout));
472 * We've been asked to lookup the address for a hostname and were
473 * given a valid numeric string. Perform the callbacks for the
476 * @param cls struct GNUNET_RESOLVER_RequestHandle for the request
477 * @param tc unused scheduler context
480 numeric_resolution (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
482 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
483 struct sockaddr_in v4;
484 struct sockaddr_in6 v6;
485 const char *hostname;
487 memset (&v4, 0, sizeof (v4));
488 v4.sin_family = AF_INET;
489 #if HAVE_SOCKADDR_IN_SIN_LEN
490 v4.sin_len = sizeof (v4);
492 memset (&v6, 0, sizeof (v6));
493 v6.sin6_family = AF_INET6;
494 #if HAVE_SOCKADDR_IN_SIN_LEN
495 v6.sin6_len = sizeof (v6);
497 hostname = (const char *) &rh[1];
498 if (((rh->domain == AF_UNSPEC) || (rh->domain == AF_INET)) &&
499 (1 == inet_pton (AF_INET, hostname, &v4.sin_addr)))
501 rh->addr_callback (rh->cls, (const struct sockaddr *) &v4, sizeof (v4));
502 if ((rh->domain == AF_UNSPEC) &&
503 (1 == inet_pton (AF_INET6, hostname, &v6.sin6_addr)))
505 /* this can happen on some systems IF "hostname" is "localhost" */
506 rh->addr_callback (rh->cls, (const struct sockaddr *) &v6, sizeof (v6));
508 rh->addr_callback (rh->cls, NULL, 0);
512 if (((rh->domain == AF_UNSPEC) || (rh->domain == AF_INET6)) &&
513 (1 == inet_pton (AF_INET6, hostname, &v6.sin6_addr)))
515 rh->addr_callback (rh->cls, (const struct sockaddr *) &v6, sizeof (v6));
516 rh->addr_callback (rh->cls, NULL, 0);
520 /* why are we here? this task should not have been scheduled! */
527 * We've been asked to lookup the address for a hostname and were
528 * given a variant of "loopback". Perform the callbacks for the
529 * respective loopback numeric addresses.
531 * @param cls struct GNUNET_RESOLVER_RequestHandle for the request
532 * @param tc unused scheduler context
535 loopback_resolution (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
537 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
538 struct sockaddr_in v4;
539 struct sockaddr_in6 v6;
541 memset (&v4, 0, sizeof (v4));
542 v4.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
543 v4.sin_family = AF_INET;
544 #if HAVE_SOCKADDR_IN_SIN_LEN
545 v4.sin_len = sizeof (v4);
547 memset (&v6, 0, sizeof (v6));
548 v6.sin6_family = AF_INET6;
549 #if HAVE_SOCKADDR_IN_SIN_LEN
550 v6.sin6_len = sizeof (v6);
552 v6.sin6_addr = in6addr_loopback;
556 rh->addr_callback (rh->cls, (const struct sockaddr *) &v4, sizeof (v4));
559 rh->addr_callback (rh->cls, (const struct sockaddr *) &v6, sizeof (v6));
562 rh->addr_callback (rh->cls, (const struct sockaddr *) &v6, sizeof (v6));
563 rh->addr_callback (rh->cls, (const struct sockaddr *) &v4, sizeof (v4));
569 rh->addr_callback (rh->cls, NULL, 0);
575 * Task executed on system shutdown.
578 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
580 s_task = GNUNET_SCHEDULER_NO_TASK;
581 GNUNET_RESOLVER_disconnect ();
586 * Process pending requests to the resolver.
588 * @param h handle to the resolver
593 struct GNUNET_RESOLVER_GetMessage *msg;
594 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
595 struct GNUNET_RESOLVER_RequestHandle *rh;
605 /* nothing to do, release socket really soon if there is nothing
606 * else happening... */
608 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MILLISECONDS,
609 &shutdown_task, NULL);
612 if (GNUNET_YES == rh->was_transmitted)
613 return; /* waiting for reply */
614 msg = (struct GNUNET_RESOLVER_GetMessage *) buf;
616 htons (sizeof (struct GNUNET_RESOLVER_GetMessage) + rh->data_len);
617 msg->header.type = htons (GNUNET_MESSAGE_TYPE_RESOLVER_REQUEST);
618 msg->direction = htonl (rh->direction);
619 msg->domain = htonl (rh->domain);
620 memcpy (&msg[1], &rh[1], rh->data_len);
622 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
623 "Transmitting DNS resolution request to DNS service\n");
626 GNUNET_CLIENT_transmit_and_get_response (client, &msg->header,
627 GNUNET_TIME_absolute_get_remaining
628 (rh->timeout), GNUNET_YES,
629 &handle_response, rh))
631 GNUNET_CLIENT_disconnect (client, GNUNET_NO);
636 rh->was_transmitted = GNUNET_YES;
641 * Now try to reconnect to the resolver service.
644 * @param tc scheduler context
647 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
649 r_task = GNUNET_SCHEDULER_NO_TASK;
650 if (NULL == req_head)
651 return; /* no work pending */
652 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
655 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Trying to connect to DNS service\n");
657 client = GNUNET_CLIENT_connect ("resolver", cfg);
660 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
661 "Failed to connect, will try again later\n");
670 * Adjust exponential back-off and reconnect to the service.
675 struct GNUNET_RESOLVER_RequestHandle *rh;
677 if (GNUNET_SCHEDULER_NO_TASK != r_task)
679 GNUNET_assert (NULL == client);
680 if (NULL != (rh = req_head))
682 switch (rh->was_transmitted)
685 /* nothing more to do */
688 /* disconnected, transmit again! */
689 rh->was_transmitted = GNUNET_NO;
692 /* request was cancelled, remove entirely */
693 GNUNET_CONTAINER_DLL_remove (req_head, req_tail, rh);
702 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
703 "Will try to connect to DNS service in %llu ms\n",
704 (unsigned long long) backoff.rel_value);
706 GNUNET_assert (NULL != cfg);
707 r_task = GNUNET_SCHEDULER_add_delayed (backoff, &reconnect_task, NULL);
708 backoff = GNUNET_TIME_relative_multiply (backoff, 2);
713 * Convert a string to one or more IP addresses.
715 * @param hostname the hostname to resolve
716 * @param domain AF_INET or AF_INET6; use AF_UNSPEC for "any"
717 * @param callback function to call with addresses
718 * @param callback_cls closure for callback
719 * @param timeout how long to try resolving
720 * @return handle that can be used to cancel the request, NULL on error
722 struct GNUNET_RESOLVER_RequestHandle *
723 GNUNET_RESOLVER_ip_get (const char *hostname, int domain,
724 struct GNUNET_TIME_Relative timeout,
725 GNUNET_RESOLVER_AddressCallback callback,
728 struct GNUNET_RESOLVER_RequestHandle *rh;
734 slen = strlen (hostname) + 1;
735 if (slen + sizeof (struct GNUNET_RESOLVER_GetMessage) >=
736 GNUNET_SERVER_MAX_MESSAGE_SIZE)
741 rh = GNUNET_malloc (sizeof (struct GNUNET_RESOLVER_RequestHandle) + slen);
743 rh->addr_callback = callback;
744 rh->cls = callback_cls;
745 memcpy (&rh[1], hostname, slen);
747 rh->timeout = GNUNET_TIME_relative_to_absolute (timeout);
748 rh->direction = GNUNET_NO;
749 /* first, check if this is a numeric address */
750 if (((1 == inet_pton (AF_INET, hostname, &v4)) &&
751 ((domain == AF_INET) || (domain == AF_UNSPEC))) ||
752 ((1 == inet_pton (AF_INET6, hostname, &v6)) &&
753 ((domain == AF_INET6) || (domain == AF_UNSPEC))))
755 rh->task = GNUNET_SCHEDULER_add_now (&numeric_resolution, rh);
758 /* then, check if this is a loopback address */
760 while (loopback[i] != NULL)
761 if (0 == strcasecmp (loopback[i++], hostname))
763 rh->task = GNUNET_SCHEDULER_add_now (&loopback_resolution, rh);
766 GNUNET_CONTAINER_DLL_insert_tail (req_head, req_tail, rh);
767 rh->was_queued = GNUNET_YES;
768 if (s_task != GNUNET_SCHEDULER_NO_TASK)
770 GNUNET_SCHEDULER_cancel (s_task);
771 s_task = GNUNET_SCHEDULER_NO_TASK;
779 * We've been asked to convert an address to a string without
780 * a reverse lookup. Do it.
782 * @param cls struct GNUNET_RESOLVER_RequestHandle for the request
783 * @param tc unused scheduler context
786 numeric_reverse (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
788 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
791 result = no_resolve ((const struct sockaddr *) &rh[1], rh->data_len);
793 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, _("Resolver returns `%s'.\n"), result);
797 rh->name_callback (rh->cls, result);
798 GNUNET_free (result);
800 rh->name_callback (rh->cls, NULL);
806 * Get an IP address as a string.
808 * @param sa host address
809 * @param salen length of host address
810 * @param do_resolve use GNUNET_NO to return numeric hostname
811 * @param timeout how long to try resolving
812 * @param callback function to call with hostnames
813 * last callback is NULL when finished
814 * @param cls closure for callback
815 * @return handle that can be used to cancel the request
817 struct GNUNET_RESOLVER_RequestHandle *
818 GNUNET_RESOLVER_hostname_get (const struct sockaddr *sa, socklen_t salen,
820 struct GNUNET_TIME_Relative timeout,
821 GNUNET_RESOLVER_HostnameCallback callback,
824 struct GNUNET_RESOLVER_RequestHandle *rh;
827 rh = GNUNET_malloc (sizeof (struct GNUNET_RESOLVER_RequestHandle) + salen);
828 rh->name_callback = callback;
830 rh->timeout = GNUNET_TIME_relative_to_absolute (timeout);
831 memcpy (&rh[1], sa, salen);
832 rh->data_len = salen;
833 rh->direction = GNUNET_YES;
834 rh->received_response = GNUNET_NO;
835 if (GNUNET_NO == do_resolve)
837 rh->task = GNUNET_SCHEDULER_add_now (&numeric_reverse, rh);
840 if (salen + sizeof (struct GNUNET_RESOLVER_GetMessage) >=
841 GNUNET_SERVER_MAX_MESSAGE_SIZE)
847 GNUNET_CONTAINER_DLL_insert_tail (req_head, req_tail, rh);
848 rh->was_queued = GNUNET_YES;
849 if (s_task != GNUNET_SCHEDULER_NO_TASK)
851 GNUNET_SCHEDULER_cancel (s_task);
852 s_task = GNUNET_SCHEDULER_NO_TASK;
860 * Get local fully qualified domain name
865 GNUNET_RESOLVER_local_fqdn_get ()
867 struct hostent *host;
868 char hostname[GNUNET_OS_get_hostname_max_length () + 1];
870 if (0 != gethostname (hostname, sizeof (hostname) - 1))
872 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
877 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, _("Resolving our FQDN `%s'\n"),
880 host = gethostbyname (hostname);
883 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Could not resolve our FQDN : %s\n"),
884 hstrerror (h_errno));
887 return GNUNET_strdup (host->h_name);
892 * Looking our own hostname.
894 * @param domain AF_INET or AF_INET6; use AF_UNSPEC for "any"
895 * @param callback function to call with addresses
896 * @param cls closure for callback
897 * @param timeout how long to try resolving
898 * @return handle that can be used to cancel the request, NULL on error
900 struct GNUNET_RESOLVER_RequestHandle *
901 GNUNET_RESOLVER_hostname_resolve (int domain,
902 struct GNUNET_TIME_Relative timeout,
903 GNUNET_RESOLVER_AddressCallback callback,
906 char hostname[GNUNET_OS_get_hostname_max_length () + 1];
908 if (0 != gethostname (hostname, sizeof (hostname) - 1))
910 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
915 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, _("Resolving our hostname `%s'\n"),
918 return GNUNET_RESOLVER_ip_get (hostname, domain, timeout, callback, cls);
923 * Cancel a request that is still pending with the resolver.
924 * Note that a client MUST NOT cancel a request that has
925 * been completed (i.e, the callback has been called to
926 * signal timeout or the final result).
928 * @param rh handle of request to cancel
931 GNUNET_RESOLVER_request_cancel (struct GNUNET_RESOLVER_RequestHandle *rh)
933 if (rh->task != GNUNET_SCHEDULER_NO_TASK)
935 GNUNET_SCHEDULER_cancel (rh->task);
936 rh->task = GNUNET_SCHEDULER_NO_TASK;
938 if (rh->was_transmitted == GNUNET_NO)
940 if (rh->was_queued == GNUNET_YES)
941 GNUNET_CONTAINER_DLL_remove (req_head, req_tail, rh);
945 GNUNET_assert (rh->was_transmitted == GNUNET_YES);
946 rh->was_transmitted = GNUNET_SYSERR; /* mark as cancelled */
950 /* end of resolver_api.c */