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, NULL);
380 if (NULL != rh->addr_callback)
381 rh->addr_callback (rh->cls, NULL, 0);
383 GNUNET_CONTAINER_DLL_remove (req_head, req_tail, rh);
384 if (NULL != rh->task)
385 GNUNET_SCHEDULER_cancel (rh->task);
387 GNUNET_CLIENT_disconnect (client);
392 if (GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE != ntohs (msg->type))
395 GNUNET_CLIENT_disconnect (client);
400 size = ntohs (msg->size);
401 if (size == sizeof (struct GNUNET_MessageHeader))
403 /* message contains not data, just header; end of replies */
404 /* check if request was canceled */
405 if (GNUNET_SYSERR != rh->was_transmitted)
407 if (NULL != rh->name_callback)
408 rh->name_callback (rh->cls, NULL);
409 if (NULL != rh->addr_callback)
410 rh->addr_callback (rh->cls, NULL, 0);
412 GNUNET_CONTAINER_DLL_remove (req_head, req_tail, rh);
413 if (NULL != rh->task)
414 GNUNET_SCHEDULER_cancel (rh->task);
419 /* return reverse lookup results to caller */
420 if (NULL != rh->name_callback)
422 const char *hostname;
424 hostname = (const char *) &msg[1];
425 if (hostname[size - sizeof (struct GNUNET_MessageHeader) - 1] != '\0')
428 if (GNUNET_SYSERR != rh->was_transmitted)
429 rh->name_callback (rh->cls, NULL);
430 GNUNET_CONTAINER_DLL_remove (req_head, req_tail, rh);
431 if (NULL != rh->task)
432 GNUNET_SCHEDULER_cancel (rh->task);
434 GNUNET_CLIENT_disconnect (client);
439 LOG (GNUNET_ERROR_TYPE_DEBUG,
440 "Resolver returns `%s' for IP `%s'.\n",
442 GNUNET_a2s ((const void *) &rh[1],
444 if (rh->was_transmitted != GNUNET_SYSERR)
445 rh->name_callback (rh->cls, hostname);
446 rh->received_response = GNUNET_YES;
448 /* return lookup results to caller */
449 if (NULL != rh->addr_callback)
451 struct sockaddr_in v4;
452 struct sockaddr_in6 v6;
453 const struct sockaddr *sa;
459 ip_len = size - sizeof (struct GNUNET_MessageHeader);
460 if (ip_len == sizeof (struct in_addr))
462 memset (&v4, 0, sizeof (v4));
463 v4.sin_family = AF_INET;
464 v4.sin_addr = *(struct in_addr*) ip;
465 #if HAVE_SOCKADDR_IN_SIN_LEN
466 v4.sin_len = sizeof (v4);
469 sa = (const struct sockaddr *) &v4;
471 else if (ip_len == sizeof (struct in6_addr))
473 memset (&v6, 0, sizeof (v6));
474 v6.sin6_family = AF_INET6;
475 v6.sin6_addr = *(struct in6_addr*) ip;
476 #if HAVE_SOCKADDR_IN_SIN_LEN
477 v6.sin6_len = sizeof (v6);
480 sa = (const struct sockaddr *) &v6;
485 if (GNUNET_SYSERR != rh->was_transmitted)
486 rh->addr_callback (rh->cls, NULL, 0);
487 GNUNET_CONTAINER_DLL_remove (req_head, req_tail, rh);
488 if (NULL != rh->task)
489 GNUNET_SCHEDULER_cancel (rh->task);
491 GNUNET_CLIENT_disconnect (client);
496 rh->addr_callback (rh->cls, sa, salen);
498 GNUNET_CLIENT_receive (client,
501 GNUNET_TIME_absolute_get_remaining (rh->timeout));
506 * We've been asked to lookup the address for a hostname and were
507 * given a valid numeric string. Perform the callbacks for the
510 * @param cls `struct GNUNET_RESOLVER_RequestHandle` for the request
511 * @param tc unused scheduler context
514 numeric_resolution (void *cls,
515 const struct GNUNET_SCHEDULER_TaskContext *tc)
517 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
518 struct sockaddr_in v4;
519 struct sockaddr_in6 v6;
520 const char *hostname;
523 memset (&v4, 0, sizeof (v4));
524 v4.sin_family = AF_INET;
525 #if HAVE_SOCKADDR_IN_SIN_LEN
526 v4.sin_len = sizeof (v4);
528 memset (&v6, 0, sizeof (v6));
529 v6.sin6_family = AF_INET6;
530 #if HAVE_SOCKADDR_IN_SIN_LEN
531 v6.sin6_len = sizeof (v6);
533 hostname = (const char *) &rh[1];
534 if (((rh->af == AF_UNSPEC) || (rh->af == AF_INET)) &&
535 (1 == inet_pton (AF_INET, hostname, &v4.sin_addr)))
537 rh->addr_callback (rh->cls,
538 (const struct sockaddr *) &v4,
540 if ((rh->af == AF_UNSPEC) &&
541 (1 == inet_pton (AF_INET6, hostname, &v6.sin6_addr)))
543 /* this can happen on some systems IF "hostname" is "localhost" */
544 rh->addr_callback (rh->cls,
545 (const struct sockaddr *) &v6,
548 rh->addr_callback (rh->cls, NULL, 0);
552 if ( ( (rh->af == AF_UNSPEC) ||
553 (rh->af == AF_INET6) ) &&
554 (1 == inet_pton (AF_INET6, hostname, &v6.sin6_addr) ) )
556 rh->addr_callback (rh->cls,
557 (const struct sockaddr *) &v6,
559 rh->addr_callback (rh->cls, NULL, 0);
563 /* why are we here? this task should not have been scheduled! */
570 * We've been asked to lookup the address for a hostname and were
571 * given a variant of "loopback". Perform the callbacks for the
572 * respective loopback numeric addresses.
574 * @param cls `struct GNUNET_RESOLVER_RequestHandle` for the request
575 * @param tc unused scheduler context
578 loopback_resolution (void *cls,
579 const struct GNUNET_SCHEDULER_TaskContext *tc)
581 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
582 struct sockaddr_in v4;
583 struct sockaddr_in6 v6;
586 memset (&v4, 0, sizeof (v4));
587 v4.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
588 v4.sin_family = AF_INET;
589 #if HAVE_SOCKADDR_IN_SIN_LEN
590 v4.sin_len = sizeof (v4);
592 memset (&v6, 0, sizeof (v6));
593 v6.sin6_family = AF_INET6;
594 #if HAVE_SOCKADDR_IN_SIN_LEN
595 v6.sin6_len = sizeof (v6);
597 v6.sin6_addr = in6addr_loopback;
601 rh->addr_callback (rh->cls, (const struct sockaddr *) &v4, sizeof (v4));
604 rh->addr_callback (rh->cls, (const struct sockaddr *) &v6, sizeof (v6));
607 rh->addr_callback (rh->cls, (const struct sockaddr *) &v6, sizeof (v6));
608 rh->addr_callback (rh->cls, (const struct sockaddr *) &v4, sizeof (v4));
614 rh->addr_callback (rh->cls,
622 * Task executed on system shutdown.
625 shutdown_task (void *cls,
626 const struct GNUNET_SCHEDULER_TaskContext *tc)
629 GNUNET_RESOLVER_disconnect ();
630 backoff = GNUNET_TIME_UNIT_MILLISECONDS;
635 * Process pending requests to the resolver.
640 struct GNUNET_RESOLVER_GetMessage *msg;
641 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1] GNUNET_ALIGN;
642 struct GNUNET_RESOLVER_RequestHandle *rh;
652 /* nothing to do, release socket really soon if there is nothing
653 * else happening... */
655 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MILLISECONDS,
656 &shutdown_task, NULL);
659 if (GNUNET_YES == rh->was_transmitted)
660 return; /* waiting for reply */
661 msg = (struct GNUNET_RESOLVER_GetMessage *) buf;
663 htons (sizeof (struct GNUNET_RESOLVER_GetMessage) + rh->data_len);
664 msg->header.type = htons (GNUNET_MESSAGE_TYPE_RESOLVER_REQUEST);
665 msg->direction = htonl (rh->direction);
666 msg->af = htonl (rh->af);
667 memcpy (&msg[1], &rh[1], rh->data_len);
668 LOG (GNUNET_ERROR_TYPE_DEBUG,
669 "Transmitting DNS resolution request to DNS service\n");
671 GNUNET_CLIENT_transmit_and_get_response (client,
673 GNUNET_TIME_absolute_get_remaining (rh->timeout),
675 &handle_response, rh))
677 GNUNET_CLIENT_disconnect (client);
683 rh->was_transmitted = GNUNET_YES;
688 * Now try to reconnect to the resolver service.
691 * @param tc scheduler context
694 reconnect_task (void *cls,
695 const struct GNUNET_SCHEDULER_TaskContext *tc)
698 if (NULL == req_head)
699 return; /* no work pending */
700 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
702 LOG (GNUNET_ERROR_TYPE_DEBUG,
703 "Trying to connect to DNS service\n");
704 client = GNUNET_CLIENT_connect ("resolver", resolver_cfg);
707 LOG (GNUNET_ERROR_TYPE_DEBUG,
708 "Failed to connect, will try again later\n");
717 * Adjust exponential back-off and reconnect to the service.
722 struct GNUNET_RESOLVER_RequestHandle *rh;
726 GNUNET_assert (NULL == client);
727 if (NULL != (rh = req_head))
729 switch (rh->was_transmitted)
732 /* nothing more to do */
735 /* disconnected, transmit again! */
736 rh->was_transmitted = GNUNET_NO;
739 /* request was cancelled, remove entirely */
740 GNUNET_CONTAINER_DLL_remove (req_head, req_tail, rh);
748 LOG (GNUNET_ERROR_TYPE_DEBUG,
749 "Will try to connect to DNS service in %s\n",
750 GNUNET_STRINGS_relative_time_to_string (backoff, GNUNET_YES));
751 GNUNET_assert (NULL != resolver_cfg);
752 r_task = GNUNET_SCHEDULER_add_delayed (backoff, &reconnect_task, NULL);
753 backoff = GNUNET_TIME_STD_BACKOFF (backoff);
758 * A DNS resolution timed out. Notify the application.
760 * @param cls the `struct GNUNET_RESOLVER_RequestHandle *`
761 * @param tc scheduler context
764 handle_lookup_timeout (void *cls,
765 const struct GNUNET_SCHEDULER_TaskContext *tc)
767 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
770 rh->addr_callback (rh->cls,
773 GNUNET_RESOLVER_request_cancel (rh);
778 * Convert a string to one or more IP addresses.
780 * @param hostname the hostname to resolve
781 * @param af AF_INET or AF_INET6; use AF_UNSPEC for "any"
782 * @param callback function to call with addresses
783 * @param callback_cls closure for @a callback
784 * @param timeout how long to try resolving
785 * @return handle that can be used to cancel the request, NULL on error
787 struct GNUNET_RESOLVER_RequestHandle *
788 GNUNET_RESOLVER_ip_get (const char *hostname, int af,
789 struct GNUNET_TIME_Relative timeout,
790 GNUNET_RESOLVER_AddressCallback callback,
793 struct GNUNET_RESOLVER_RequestHandle *rh;
799 slen = strlen (hostname) + 1;
800 if (slen + sizeof (struct GNUNET_RESOLVER_GetMessage) >=
801 GNUNET_SERVER_MAX_MESSAGE_SIZE)
806 rh = GNUNET_malloc (sizeof (struct GNUNET_RESOLVER_RequestHandle) + slen);
808 rh->addr_callback = callback;
809 rh->cls = callback_cls;
814 rh->timeout = GNUNET_TIME_relative_to_absolute (timeout);
815 rh->direction = GNUNET_NO;
816 /* first, check if this is a numeric address */
817 if (((1 == inet_pton (AF_INET, hostname, &v4)) &&
818 ((af == AF_INET) || (af == AF_UNSPEC))) ||
819 ((1 == inet_pton (AF_INET6, hostname, &v6)) &&
820 ((af == AF_INET6) || (af == AF_UNSPEC))))
822 rh->task = GNUNET_SCHEDULER_add_now (&numeric_resolution,
826 /* then, check if this is a loopback address */
828 while (NULL != loopback[i])
829 if (0 == strcasecmp (loopback[i++], hostname))
831 rh->task = GNUNET_SCHEDULER_add_now (&loopback_resolution,
835 rh->task = GNUNET_SCHEDULER_add_delayed (timeout,
836 &handle_lookup_timeout,
838 GNUNET_CONTAINER_DLL_insert_tail (req_head, req_tail, rh);
839 rh->was_queued = GNUNET_YES;
842 GNUNET_SCHEDULER_cancel (s_task);
851 * We've been asked to convert an address to a string without
852 * a reverse lookup, either because the client asked for it
853 * or because the DNS lookup hit a timeout. Do the numeric
854 * conversion and invoke the callback.
856 * @param cls `struct GNUNET_RESOLVER_RequestHandle` for the request
857 * @param tc unused scheduler context
860 numeric_reverse (void *cls,
861 const struct GNUNET_SCHEDULER_TaskContext *tc)
863 struct GNUNET_RESOLVER_RequestHandle *rh = cls;
867 result = no_resolve (rh->af,
870 LOG (GNUNET_ERROR_TYPE_DEBUG,
871 "Resolver returns `%s'.\n",
875 rh->name_callback (rh->cls, result);
876 GNUNET_free (result);
878 rh->name_callback (rh->cls, NULL);
884 * Get an IP address as a string.
886 * @param sa host address
887 * @param salen length of host address in @a sa
888 * @param do_resolve use #GNUNET_NO to return numeric hostname
889 * @param timeout how long to try resolving
890 * @param callback function to call with hostnames
891 * last callback is NULL when finished
892 * @param cls closure for @a callback
893 * @return handle that can be used to cancel the request
895 struct GNUNET_RESOLVER_RequestHandle *
896 GNUNET_RESOLVER_hostname_get (const struct sockaddr *sa,
899 struct GNUNET_TIME_Relative timeout,
900 GNUNET_RESOLVER_HostnameCallback callback,
903 struct GNUNET_RESOLVER_RequestHandle *rh;
908 switch (sa->sa_family)
911 ip_len = sizeof (struct in_addr);
912 ip = &((const struct sockaddr_in*)sa)->sin_addr;
915 ip_len = sizeof (struct in6_addr);
916 ip = &((const struct sockaddr_in6*)sa)->sin6_addr;
922 rh = GNUNET_malloc (sizeof (struct GNUNET_RESOLVER_RequestHandle) + salen);
923 rh->name_callback = callback;
925 rh->af = sa->sa_family;
926 rh->timeout = GNUNET_TIME_relative_to_absolute (timeout);
927 memcpy (&rh[1], ip, ip_len);
928 rh->data_len = ip_len;
929 rh->direction = GNUNET_YES;
930 rh->received_response = GNUNET_NO;
931 if (GNUNET_NO == do_resolve)
933 rh->task = GNUNET_SCHEDULER_add_now (&numeric_reverse, rh);
936 GNUNET_CONTAINER_DLL_insert_tail (req_head,
939 rh->was_queued = GNUNET_YES;
942 GNUNET_SCHEDULER_cancel (s_task);
951 * Get local fully qualified af name
956 GNUNET_RESOLVER_local_fqdn_get ()
958 struct hostent *host;
959 char hostname[GNUNET_OS_get_hostname_max_length () + 1];
961 if (0 != gethostname (hostname, sizeof (hostname) - 1))
963 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
967 LOG (GNUNET_ERROR_TYPE_DEBUG,
968 "Resolving our FQDN `%s'\n",
970 host = gethostbyname (hostname);
973 LOG (GNUNET_ERROR_TYPE_ERROR,
974 _("Could not resolve our FQDN : %s\n"),
975 hstrerror (h_errno));
978 return GNUNET_strdup (host->h_name);
983 * Looking our own hostname.
985 * @param af AF_INET or AF_INET6; use AF_UNSPEC for "any"
986 * @param timeout how long to try resolving
987 * @param callback function to call with addresses
988 * @param cls closure for @a callback
989 * @return handle that can be used to cancel the request, NULL on error
991 struct GNUNET_RESOLVER_RequestHandle *
992 GNUNET_RESOLVER_hostname_resolve (int af,
993 struct GNUNET_TIME_Relative timeout,
994 GNUNET_RESOLVER_AddressCallback callback,
997 char hostname[GNUNET_OS_get_hostname_max_length () + 1];
999 if (0 != gethostname (hostname, sizeof (hostname) - 1))
1001 LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR | GNUNET_ERROR_TYPE_BULK,
1005 LOG (GNUNET_ERROR_TYPE_DEBUG,
1006 "Resolving our hostname `%s'\n",
1008 return GNUNET_RESOLVER_ip_get (hostname,
1017 * Cancel a request that is still pending with the resolver.
1018 * Note that a client MUST NOT cancel a request that has
1019 * been completed (i.e, the callback has been called to
1020 * signal timeout or the final result).
1022 * @param rh handle of request to cancel
1025 GNUNET_RESOLVER_request_cancel (struct GNUNET_RESOLVER_RequestHandle *rh)
1027 if (rh->task != NULL)
1029 GNUNET_SCHEDULER_cancel (rh->task);
1032 if (GNUNET_NO == rh->was_transmitted)
1034 if (rh->was_queued == GNUNET_YES)
1035 GNUNET_CONTAINER_DLL_remove (req_head,
1041 GNUNET_assert (GNUNET_YES == rh->was_transmitted);
1042 rh->was_transmitted = GNUNET_SYSERR; /* mark as cancelled */
1046 /* end of resolver_api.c */