2 This file is part of GNUnet.
3 Copyright (C) 2009-2014 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 3, 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_util_lib.h"
28 #include "gnunet_protocols.h"
29 #include "gnunet_resolver_service.h"
32 #define LOG(kind,...) GNUNET_log_from (kind, "resolver-api", __VA_ARGS__)
34 #define LOG_STRERROR(kind,syscall) GNUNET_log_from_strerror (kind, "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_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 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 respective "callback".
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
180 struct sockaddr_in v4;
181 struct sockaddr_in6 v6;
183 memset (&v4, 0, sizeof (v4));
184 v4.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
185 v4.sin_family = AF_INET;
186 #if HAVE_SOCKADDR_IN_SIN_LEN
187 v4.sin_len = sizeof (v4);
189 memset (&v6, 0, sizeof (v6));
190 v6.sin6_family = AF_INET6;
191 #if HAVE_SOCKADDR_IN_SIN_LEN
192 v6.sin6_len = sizeof (v6);
195 GNUNET_CONFIGURATION_get_value_string (resolver_cfg,
200 LOG (GNUNET_ERROR_TYPE_ERROR,
201 _("Must specify `%s' for `%s' in configuration!\n"),
206 if ((1 != inet_pton (AF_INET, hostname, &v4)) ||
207 (1 != inet_pton (AF_INET6, hostname, &v6)))
209 GNUNET_free (hostname);
213 while (NULL != loopback[i])
214 if (0 == strcasecmp (loopback[i++], hostname))
216 GNUNET_free (hostname);
219 LOG (GNUNET_ERROR_TYPE_ERROR,
220 _("Must specify `%s' or numeric IP address for `%s' of `%s' in configuration!\n"),
224 GNUNET_free (hostname);
230 * Create the connection to the resolver service.
232 * @param cfg configuration to use
235 GNUNET_RESOLVER_connect (const struct GNUNET_CONFIGURATION_Handle *cfg)
237 GNUNET_assert (NULL != cfg);
238 backoff = GNUNET_TIME_UNIT_MILLISECONDS;
245 * Destroy the connection to the resolver service.
248 GNUNET_RESOLVER_disconnect ()
250 GNUNET_assert (NULL == req_head);
251 GNUNET_assert (NULL == req_tail);
254 LOG (GNUNET_ERROR_TYPE_DEBUG,
255 "Disconnecting from DNS service\n");
256 GNUNET_CLIENT_disconnect (client);
261 GNUNET_SCHEDULER_cancel (r_task);
266 GNUNET_SCHEDULER_cancel (s_task);
273 * Convert IP address to string without DNS resolution.
275 * @param af address family
276 * @param ip the address
277 * @param ip_len number of bytes in @a ip
278 * @return address as a string, NULL on error
282 const void *ip, socklen_t ip_len)
284 char buf[INET6_ADDRSTRLEN];
289 if (ip_len != sizeof (struct in_addr))
292 inet_ntop (AF_INET, ip, buf, sizeof (buf)))
294 LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING,
300 if (ip_len != sizeof (struct in6_addr))
303 inet_ntop (AF_INET6, ip, buf, sizeof (buf)))
305 LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING,
314 return GNUNET_strdup (buf);
319 * Adjust exponential back-off and reconnect to the service.
326 * Process pending requests to the resolver.
329 process_requests (void);
333 * Process response with a hostname for a DNS lookup.
335 * @param cls our `struct GNUNET_RESOLVER_RequestHandle *` context
336 * @param msg message with the hostname, NULL on error
339 handle_response (void *cls,
340 const struct GNUNET_MessageHeader *msg)
342 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
346 LOG (GNUNET_ERROR_TYPE_DEBUG,
347 "Receiving response from DNS service\n");
350 char buf[INET6_ADDRSTRLEN];
352 if (NULL != rh->name_callback)
353 LOG (GNUNET_ERROR_TYPE_INFO,
354 _("Timeout trying to resolve IP address `%s'.\n"),
356 (const void *) &rh[1],
360 LOG (GNUNET_ERROR_TYPE_INFO,
361 _("Timeout trying to resolve hostname `%s'.\n"),
362 (const char *) &rh[1]);
363 /* check if request was canceled */
364 if (GNUNET_SYSERR != rh->was_transmitted)
366 if (NULL != rh->name_callback)
368 /* no reverse lookup was successful, return IP as string */
369 if (GNUNET_NO == rh->received_response)
371 nret = no_resolve (rh->af,
374 rh->name_callback (rh->cls, nret);
377 /* finally, make termination call */
378 rh->name_callback (rh->cls,
381 if (NULL != rh->addr_callback)
382 rh->addr_callback (rh->cls,
386 rh->was_transmitted = GNUNET_NO;
387 GNUNET_RESOLVER_request_cancel (rh);
388 GNUNET_CLIENT_disconnect (client);
393 if (GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE != ntohs (msg->type))
396 GNUNET_CLIENT_disconnect (client);
401 size = ntohs (msg->size);
402 if (size == sizeof (struct GNUNET_MessageHeader))
404 /* message contains not data, just header; end of replies */
405 /* check if request was canceled */
406 if (GNUNET_SYSERR != rh->was_transmitted)
408 if (NULL != rh->name_callback)
409 rh->name_callback (rh->cls,
411 if (NULL != rh->addr_callback)
412 rh->addr_callback (rh->cls,
416 rh->was_transmitted = GNUNET_NO;
417 GNUNET_RESOLVER_request_cancel (rh);
421 /* return reverse lookup results to caller */
422 if (NULL != rh->name_callback)
424 const char *hostname;
426 hostname = (const char *) &msg[1];
427 if (hostname[size - sizeof (struct GNUNET_MessageHeader) - 1] != '\0')
430 if (GNUNET_SYSERR != rh->was_transmitted)
431 rh->name_callback (rh->cls,
433 rh->was_transmitted = GNUNET_NO;
434 GNUNET_RESOLVER_request_cancel (rh);
435 GNUNET_CLIENT_disconnect (client);
440 LOG (GNUNET_ERROR_TYPE_DEBUG,
441 "Resolver returns `%s' for IP `%s'.\n",
443 GNUNET_a2s ((const void *) &rh[1],
445 if (rh->was_transmitted != GNUNET_SYSERR)
446 rh->name_callback (rh->cls,
448 rh->received_response = GNUNET_YES;
450 /* return lookup results to caller */
451 if (NULL != rh->addr_callback)
453 struct sockaddr_in v4;
454 struct sockaddr_in6 v6;
455 const struct sockaddr *sa;
461 ip_len = size - sizeof (struct GNUNET_MessageHeader);
462 if (ip_len == sizeof (struct in_addr))
464 memset (&v4, 0, sizeof (v4));
465 v4.sin_family = AF_INET;
466 v4.sin_addr = *(struct in_addr*) ip;
467 #if HAVE_SOCKADDR_IN_SIN_LEN
468 v4.sin_len = sizeof (v4);
471 sa = (const struct sockaddr *) &v4;
473 else if (ip_len == sizeof (struct in6_addr))
475 memset (&v6, 0, sizeof (v6));
476 v6.sin6_family = AF_INET6;
477 v6.sin6_addr = *(struct in6_addr*) ip;
478 #if HAVE_SOCKADDR_IN_SIN_LEN
479 v6.sin6_len = sizeof (v6);
482 sa = (const struct sockaddr *) &v6;
487 if (GNUNET_SYSERR != rh->was_transmitted)
488 rh->addr_callback (rh->cls,
491 rh->was_transmitted = GNUNET_NO;
492 GNUNET_RESOLVER_request_cancel (rh);
493 GNUNET_CLIENT_disconnect (client);
498 if (GNUNET_SYSERR != rh->was_transmitted)
499 rh->addr_callback (rh->cls,
503 GNUNET_CLIENT_receive (client,
506 GNUNET_TIME_absolute_get_remaining (rh->timeout));
511 * We've been asked to lookup the address for a hostname and were
512 * given a valid numeric string. Perform the callbacks for the
515 * @param cls `struct GNUNET_RESOLVER_RequestHandle` for the request
516 * @param tc unused scheduler context
519 numeric_resolution (void *cls,
520 const struct GNUNET_SCHEDULER_TaskContext *tc)
522 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
523 struct sockaddr_in v4;
524 struct sockaddr_in6 v6;
525 const char *hostname;
528 memset (&v4, 0, sizeof (v4));
529 v4.sin_family = AF_INET;
530 #if HAVE_SOCKADDR_IN_SIN_LEN
531 v4.sin_len = sizeof (v4);
533 memset (&v6, 0, sizeof (v6));
534 v6.sin6_family = AF_INET6;
535 #if HAVE_SOCKADDR_IN_SIN_LEN
536 v6.sin6_len = sizeof (v6);
538 hostname = (const char *) &rh[1];
539 if (((rh->af == AF_UNSPEC) || (rh->af == AF_INET)) &&
540 (1 == inet_pton (AF_INET, hostname, &v4.sin_addr)))
542 rh->addr_callback (rh->cls,
543 (const struct sockaddr *) &v4,
545 if ((rh->af == AF_UNSPEC) &&
546 (1 == inet_pton (AF_INET6, hostname, &v6.sin6_addr)))
548 /* this can happen on some systems IF "hostname" is "localhost" */
549 rh->addr_callback (rh->cls,
550 (const struct sockaddr *) &v6,
553 rh->addr_callback (rh->cls,
559 if ( ( (rh->af == AF_UNSPEC) ||
560 (rh->af == AF_INET6) ) &&
561 (1 == inet_pton (AF_INET6, hostname, &v6.sin6_addr) ) )
563 rh->addr_callback (rh->cls,
564 (const struct sockaddr *) &v6,
566 rh->addr_callback (rh->cls,
572 /* why are we here? this task should not have been scheduled! */
579 * We've been asked to lookup the address for a hostname and were
580 * given a variant of "loopback". Perform the callbacks for the
581 * respective loopback numeric addresses.
583 * @param cls `struct GNUNET_RESOLVER_RequestHandle` for the request
584 * @param tc unused scheduler context
587 loopback_resolution (void *cls,
588 const struct GNUNET_SCHEDULER_TaskContext *tc)
590 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
591 struct sockaddr_in v4;
592 struct sockaddr_in6 v6;
595 memset (&v4, 0, sizeof (v4));
596 v4.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
597 v4.sin_family = AF_INET;
598 #if HAVE_SOCKADDR_IN_SIN_LEN
599 v4.sin_len = sizeof (v4);
601 memset (&v6, 0, sizeof (v6));
602 v6.sin6_family = AF_INET6;
603 #if HAVE_SOCKADDR_IN_SIN_LEN
604 v6.sin6_len = sizeof (v6);
606 v6.sin6_addr = in6addr_loopback;
610 rh->addr_callback (rh->cls,
611 (const struct sockaddr *) &v4,
615 rh->addr_callback (rh->cls,
616 (const struct sockaddr *) &v6,
620 rh->addr_callback (rh->cls,
621 (const struct sockaddr *) &v6,
623 rh->addr_callback (rh->cls,
624 (const struct sockaddr *) &v4,
631 rh->addr_callback (rh->cls,
639 * Task executed on system shutdown.
642 shutdown_task (void *cls,
643 const struct GNUNET_SCHEDULER_TaskContext *tc)
646 GNUNET_RESOLVER_disconnect ();
647 backoff = GNUNET_TIME_UNIT_MILLISECONDS;
652 * Process pending requests to the resolver.
657 struct GNUNET_RESOLVER_GetMessage *msg;
658 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1] GNUNET_ALIGN;
659 struct GNUNET_RESOLVER_RequestHandle *rh;
669 /* nothing to do, release socket really soon if there is nothing
670 * else happening... */
672 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MILLISECONDS,
677 if (GNUNET_YES == rh->was_transmitted)
678 return; /* waiting for reply */
679 msg = (struct GNUNET_RESOLVER_GetMessage *) buf;
681 htons (sizeof (struct GNUNET_RESOLVER_GetMessage) + rh->data_len);
682 msg->header.type = htons (GNUNET_MESSAGE_TYPE_RESOLVER_REQUEST);
683 msg->direction = htonl (rh->direction);
684 msg->af = htonl (rh->af);
688 LOG (GNUNET_ERROR_TYPE_DEBUG,
689 "Transmitting DNS resolution request to DNS service\n");
691 GNUNET_CLIENT_transmit_and_get_response (client,
693 GNUNET_TIME_absolute_get_remaining (rh->timeout),
698 GNUNET_CLIENT_disconnect (client);
704 rh->was_transmitted = GNUNET_YES;
709 * Now try to reconnect to the resolver service.
712 * @param tc scheduler context
715 reconnect_task (void *cls,
716 const struct GNUNET_SCHEDULER_TaskContext *tc)
719 if (NULL == req_head)
720 return; /* no work pending */
721 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
723 LOG (GNUNET_ERROR_TYPE_DEBUG,
724 "Trying to connect to DNS service\n");
725 client = GNUNET_CLIENT_connect ("resolver",
729 LOG (GNUNET_ERROR_TYPE_DEBUG,
730 "Failed to connect, will try again later\n");
739 * Adjust exponential back-off and reconnect to the service.
744 struct GNUNET_RESOLVER_RequestHandle *rh;
748 GNUNET_assert (NULL == client);
749 if (NULL != (rh = req_head))
751 switch (rh->was_transmitted)
754 /* nothing more to do */
757 /* disconnected, transmit again! */
758 rh->was_transmitted = GNUNET_NO;
761 /* request was cancelled, remove entirely */
762 GNUNET_CONTAINER_DLL_remove (req_head, req_tail, rh);
770 LOG (GNUNET_ERROR_TYPE_DEBUG,
771 "Will try to connect to DNS service in %s\n",
772 GNUNET_STRINGS_relative_time_to_string (backoff,
774 GNUNET_assert (NULL != resolver_cfg);
775 r_task = GNUNET_SCHEDULER_add_delayed (backoff,
778 backoff = GNUNET_TIME_STD_BACKOFF (backoff);
783 * A DNS resolution timed out. Notify the application.
785 * @param cls the `struct GNUNET_RESOLVER_RequestHandle *`
786 * @param tc scheduler context
789 handle_lookup_timeout (void *cls,
790 const struct GNUNET_SCHEDULER_TaskContext *tc)
792 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
795 rh->addr_callback (rh->cls,
798 GNUNET_RESOLVER_request_cancel (rh);
803 * Convert a string to one or more IP addresses.
805 * @param hostname the hostname to resolve
806 * @param af AF_INET or AF_INET6; use AF_UNSPEC for "any"
807 * @param callback function to call with addresses
808 * @param callback_cls closure for @a callback
809 * @param timeout how long to try resolving
810 * @return handle that can be used to cancel the request, NULL on error
812 struct GNUNET_RESOLVER_RequestHandle *
813 GNUNET_RESOLVER_ip_get (const char *hostname, int af,
814 struct GNUNET_TIME_Relative timeout,
815 GNUNET_RESOLVER_AddressCallback callback,
818 struct GNUNET_RESOLVER_RequestHandle *rh;
824 slen = strlen (hostname) + 1;
825 if (slen + sizeof (struct GNUNET_RESOLVER_GetMessage) >=
826 GNUNET_SERVER_MAX_MESSAGE_SIZE)
831 rh = GNUNET_malloc (sizeof (struct GNUNET_RESOLVER_RequestHandle) + slen);
833 rh->addr_callback = callback;
834 rh->cls = callback_cls;
839 rh->timeout = GNUNET_TIME_relative_to_absolute (timeout);
840 rh->direction = GNUNET_NO;
841 /* first, check if this is a numeric address */
842 if (((1 == inet_pton (AF_INET, hostname, &v4)) &&
843 ((af == AF_INET) || (af == AF_UNSPEC))) ||
844 ((1 == inet_pton (AF_INET6, hostname, &v6)) &&
845 ((af == AF_INET6) || (af == AF_UNSPEC))))
847 rh->task = GNUNET_SCHEDULER_add_now (&numeric_resolution,
851 /* then, check if this is a loopback address */
853 while (NULL != loopback[i])
854 if (0 == strcasecmp (loopback[i++],
857 rh->task = GNUNET_SCHEDULER_add_now (&loopback_resolution,
861 rh->task = GNUNET_SCHEDULER_add_delayed (timeout,
862 &handle_lookup_timeout,
864 GNUNET_CONTAINER_DLL_insert_tail (req_head,
867 rh->was_queued = GNUNET_YES;
870 GNUNET_SCHEDULER_cancel (s_task);
879 * We've been asked to convert an address to a string without
880 * a reverse lookup, either because the client asked for it
881 * or because the DNS lookup hit a timeout. Do the numeric
882 * conversion and invoke the callback.
884 * @param cls `struct GNUNET_RESOLVER_RequestHandle` for the request
885 * @param tc unused scheduler context
888 numeric_reverse (void *cls,
889 const struct GNUNET_SCHEDULER_TaskContext *tc)
891 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
895 result = no_resolve (rh->af,
898 LOG (GNUNET_ERROR_TYPE_DEBUG,
899 "Resolver returns `%s'.\n",
903 rh->name_callback (rh->cls,
905 GNUNET_free (result);
907 rh->name_callback (rh->cls,
914 * Get an IP address as a string.
916 * @param sa host address
917 * @param salen length of host address in @a sa
918 * @param do_resolve use #GNUNET_NO to return numeric hostname
919 * @param timeout how long to try resolving
920 * @param callback function to call with hostnames
921 * last callback is NULL when finished
922 * @param cls closure for @a callback
923 * @return handle that can be used to cancel the request
925 struct GNUNET_RESOLVER_RequestHandle *
926 GNUNET_RESOLVER_hostname_get (const struct sockaddr *sa,
929 struct GNUNET_TIME_Relative timeout,
930 GNUNET_RESOLVER_HostnameCallback callback,
933 struct GNUNET_RESOLVER_RequestHandle *rh;
938 switch (sa->sa_family)
941 ip_len = sizeof (struct in_addr);
942 ip = &((const struct sockaddr_in*)sa)->sin_addr;
945 ip_len = sizeof (struct in6_addr);
946 ip = &((const struct sockaddr_in6*)sa)->sin6_addr;
952 rh = GNUNET_malloc (sizeof (struct GNUNET_RESOLVER_RequestHandle) + salen);
953 rh->name_callback = callback;
955 rh->af = sa->sa_family;
956 rh->timeout = GNUNET_TIME_relative_to_absolute (timeout);
957 memcpy (&rh[1], ip, ip_len);
958 rh->data_len = ip_len;
959 rh->direction = GNUNET_YES;
960 rh->received_response = GNUNET_NO;
961 if (GNUNET_NO == do_resolve)
963 rh->task = GNUNET_SCHEDULER_add_now (&numeric_reverse, rh);
966 GNUNET_CONTAINER_DLL_insert_tail (req_head,
969 rh->was_queued = GNUNET_YES;
972 GNUNET_SCHEDULER_cancel (s_task);
981 * Get local fully qualified af name
986 GNUNET_RESOLVER_local_fqdn_get ()
988 struct hostent *host;
989 char hostname[GNUNET_OS_get_hostname_max_length () + 1];
991 if (0 != gethostname (hostname, sizeof (hostname) - 1))
993 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
997 LOG (GNUNET_ERROR_TYPE_DEBUG,
998 "Resolving our FQDN `%s'\n",
1000 host = gethostbyname (hostname);
1003 LOG (GNUNET_ERROR_TYPE_ERROR,
1004 _("Could not resolve our FQDN : %s\n"),
1005 hstrerror (h_errno));
1008 return GNUNET_strdup (host->h_name);
1013 * Looking our own hostname.
1015 * @param af AF_INET or AF_INET6; use AF_UNSPEC for "any"
1016 * @param timeout how long to try resolving
1017 * @param callback function to call with addresses
1018 * @param cls closure for @a callback
1019 * @return handle that can be used to cancel the request, NULL on error
1021 struct GNUNET_RESOLVER_RequestHandle *
1022 GNUNET_RESOLVER_hostname_resolve (int af,
1023 struct GNUNET_TIME_Relative timeout,
1024 GNUNET_RESOLVER_AddressCallback callback,
1027 char hostname[GNUNET_OS_get_hostname_max_length () + 1];
1029 if (0 != gethostname (hostname, sizeof (hostname) - 1))
1031 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
1035 LOG (GNUNET_ERROR_TYPE_DEBUG,
1036 "Resolving our hostname `%s'\n",
1038 return GNUNET_RESOLVER_ip_get (hostname,
1047 * Cancel a request that is still pending with the resolver.
1048 * Note that a client MUST NOT cancel a request that has
1049 * been completed (i.e, the callback has been called to
1050 * signal timeout or the final result).
1052 * @param rh handle of request to cancel
1055 GNUNET_RESOLVER_request_cancel (struct GNUNET_RESOLVER_RequestHandle *rh)
1057 if (NULL != rh->task)
1059 GNUNET_SCHEDULER_cancel (rh->task);
1062 if (GNUNET_NO == rh->was_transmitted)
1064 if (GNUNET_YES == rh->was_queued)
1065 GNUNET_CONTAINER_DLL_remove (req_head,
1071 GNUNET_assert (GNUNET_YES == rh->was_transmitted);
1072 rh->was_transmitted = GNUNET_SYSERR; /* mark as cancelled */
1076 /* end of resolver_api.c */