2 This file is part of GNUnet
3 (C) 2010 Christian Grothoff (and other contributing authors)
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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 2, or (at your
8 option) any later version.
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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.
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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 transport/plugin_transport_udp.c
23 * @brief Implementation of the UDP transport service
24 * @author Christian Grothoff
25 * @author Nathan Evans
29 #include "gnunet_hello_lib.h"
30 #include "gnunet_connection_lib.h"
31 #include "gnunet_os_lib.h"
32 #include "gnunet_peerinfo_service.h"
33 #include "gnunet_protocols.h"
34 #include "gnunet_resolver_service.h"
35 #include "gnunet_server_lib.h"
36 #include "gnunet_service_lib.h"
37 #include "gnunet_signatures.h"
38 #include "gnunet_statistics_service.h"
39 #include "gnunet_transport_service.h"
40 #include "plugin_transport.h"
41 #include "transport.h"
43 #define DEBUG_UDP GNUNET_NO
46 * Transport cost to peer, always 1 for UDP (direct connection)
48 #define UDP_DIRECT_DISTANCE 1
51 * How long until we give up on transmitting the welcome message?
53 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
57 * Message-Packet header.
62 * size of the message, in bytes, including this header.
64 struct GNUNET_MessageHeader header;
67 * What is the identity of the sender (GNUNET_hash of public key)
69 struct GNUNET_PeerIdentity sender;
75 * Network format for IPv4 addresses.
80 * IPv4 address, in network byte order.
85 * Port number, in network byte order.
93 * Network format for IPv6 addresses.
100 struct in6_addr ipv6_addr;
103 * Port number, in network byte order.
113 struct PrettyPrinterContext
118 GNUNET_TRANSPORT_AddressStringCallback asc;
133 * Encapsulation of all of the state of the plugin.
140 struct GNUNET_TRANSPORT_PluginEnvironment *env;
143 * Handle to the network service.
145 struct GNUNET_SERVICE_Context *service;
148 * Handle for request of hostname resolution, non-NULL if pending.
150 struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
155 struct GNUNET_NETWORK_FDSet *rs;
158 * ID of task used to update our addresses when one expires.
160 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
165 GNUNET_SCHEDULER_TaskIdentifier select_task;
168 * Port that we are actually listening on.
173 * Port that the user said we would have visible to the
180 /* *********** globals ************* */
183 * The socket that we transmit all data with
185 static struct GNUNET_NETWORK_Handle *udp_sock;
188 * Disconnect from a remote node.
190 * @param cls closure ('struct Plugin'), unused
191 * @param target peer do disconnect
192 * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
195 udp_disconnect (void *cls,
196 const struct GNUNET_PeerIdentity *target)
198 /* nothing to do, UDP is stateless */
202 * Shutdown the server process (stop receiving inbound traffic). Maybe
205 * @param cls closure, the 'struct Plugin*'
208 udp_transport_server_stop (void *cls)
210 struct Plugin *plugin = cls;
213 GNUNET_assert (udp_sock != NULL);
214 if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
216 GNUNET_SCHEDULER_cancel (plugin->env->sched, plugin->select_task);
217 plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
220 ret = GNUNET_NETWORK_socket_close (udp_sock);
221 if (ret != GNUNET_SYSERR)
227 * Function that can be used by the transport service to transmit
228 * a message using the plugin.
230 * @param cls closure, the 'struct Plugin*'
231 * @param target who should receive this message (ignored by UDP)
232 * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
233 * @param msgbuf_size the size of the msgbuf to send
234 * @param priority how important is the message (ignored by UDP)
235 * @param timeout when should we time out (give up) if we can not transmit?
236 * @param session which session must be used (always NULL for UDP)
237 * @param addr the addr to send the message to, needs to be a sockaddr for us
238 * @param addrlen the len of addr
239 * @param force_address GNUNET_YES if the plugin MUST use the given address,
240 * GNUNET_NO means the plugin may use any other address and
241 * GNUNET_SYSERR means that only reliable existing
242 * bi-directional connections should be used (regardless
244 * @param cont continuation to call once the message has
245 * been transmitted (or if the transport is ready
246 * for the next transmission call; or if the
247 * peer disconnected...)
248 * @param cont_cls closure for cont
250 * @return the number of bytes written, -1 on error (in this case, cont is not called)
253 udp_plugin_send (void *cls,
254 const struct GNUNET_PeerIdentity *target,
257 unsigned int priority,
258 struct GNUNET_TIME_Relative timeout,
259 struct Session *session,
263 GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
265 struct Plugin *plugin = cls;
266 struct UDPMessage *message;
271 struct sockaddr_in a4;
272 struct sockaddr_in6 a6;
273 const struct IPv4UdpAddress *t4;
274 const struct IPv6UdpAddress *t6;
276 GNUNET_assert (NULL == session);
277 GNUNET_assert(udp_sock != NULL);
278 if ( (addr == NULL) || (addrlen == 0) )
281 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
282 ("udp_plugin_send called without address, returning!\n"));
284 return -1; /* Can never send if we don't have an address!! */
286 if (force_address == GNUNET_SYSERR)
287 return -1; /* never reliable */
289 if (addrlen == sizeof (struct IPv6UdpAddress))
292 memset (&a6, 0, sizeof (a6));
293 #if HAVE_SOCKADDR_IN_SIN_LEN
294 a6.sin6_len = sizeof (a6);
296 a6.sin6_family = AF_INET6;
297 a6.sin6_port = t6->u6_port;
298 memcpy (&a6.sin6_addr,
300 sizeof (struct in6_addr));
304 else if (addrlen == sizeof (struct IPv4UdpAddress))
307 memset (&a4, 0, sizeof (a4));
308 #if HAVE_SOCKADDR_IN_SIN_LEN
309 a4.sin_len = sizeof (a4);
311 a4.sin_family = AF_INET;
312 a4.sin_port = t4->u_port;
313 a4.sin_addr.s_addr = t4->ipv4_addr;
323 /* Build the message to be sent */
324 message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size);
325 ssize = sizeof (struct UDPMessage) + msgbuf_size;
328 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
329 "In udp_send, ssize is %d, sending message to `%s'\n",
331 GNUNET_a2s(sb, sbs));
333 message->header.size = htons (ssize);
334 message->header.type = htons (0);
335 memcpy (&message->sender, plugin->env->my_identity,
336 sizeof (struct GNUNET_PeerIdentity));
337 memcpy (&message[1], msgbuf, msgbuf_size);
339 GNUNET_NETWORK_socket_sendto (udp_sock, message, ssize,
341 if ( (cont != NULL) &&
343 cont (cont_cls, target, GNUNET_OK);
344 GNUNET_free (message);
350 * Add the IP of our network interface to the list of
351 * our external IP addresses.
353 * @param cls closure (the 'struct Plugin*')
354 * @param name name of the interface (can be NULL for unknown)
355 * @param isDefault is this presumably the default interface
356 * @param addr address of this interface (can be NULL for unknown or unassigned)
357 * @param addrlen length of the address
358 * @return GNUNET_OK to continue iterating
361 process_interfaces (void *cls,
364 const struct sockaddr *addr, socklen_t addrlen)
366 struct Plugin *plugin = cls;
368 struct IPv4UdpAddress t4;
369 struct IPv6UdpAddress t6;
373 af = addr->sa_family;
376 t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
377 t4.u_port = htons (plugin->adv_port);
381 else if (af == AF_INET6)
383 if (IN6_IS_ADDR_LINKLOCAL (&((struct sockaddr_in6 *) addr)->sin6_addr))
385 /* skip link local addresses */
388 memcpy (&t6.ipv6_addr,
389 &((struct sockaddr_in6 *) addr)->sin6_addr,
390 sizeof (struct in6_addr));
391 t6.u6_port = htons (plugin->adv_port);
400 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
401 GNUNET_ERROR_TYPE_BULK,
403 _("Found address `%s' (%s)\n"),
404 GNUNET_a2s (addr, addrlen),
406 plugin->env->notify_address (plugin->env->cls,
408 arg, args, GNUNET_TIME_UNIT_FOREVER_REL);
414 * Function called by the resolver for each address obtained from DNS
415 * for our own hostname. Add the addresses to the list of our
416 * external IP addresses.
419 * @param addr one of the addresses of the host, NULL for the last address
420 * @param addrlen length of the address
423 process_hostname_ips (void *cls,
424 const struct sockaddr *addr, socklen_t addrlen)
426 struct Plugin *plugin = cls;
430 plugin->hostname_dns = NULL;
433 process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
438 * @param cls the plugin handle
439 * @param tc the scheduling context (for rescheduling this function again)
441 * We have been notified that our writeset has something to read. Presumably
442 * select has been called already, so we can go ahead and start reading from
443 * the socket immediately. Then we check if there is more to be read by
444 * calling select ourselves while there is stuff on the wire. Then reschedule
445 * this function to be called again once more is available.
449 udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
451 struct Plugin *plugin = cls;
453 struct UDPMessage *msg;
454 struct GNUNET_PeerIdentity *sender;
457 struct sockaddr_storage addr;
463 const struct GNUNET_MessageHeader *currhdr;
464 struct IPv4UdpAddress t4;
465 struct IPv6UdpAddress t6;
466 const struct sockaddr_in *s4;
467 const struct sockaddr_in6 *s6;
472 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
473 ("entered select...\n"));
476 buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_sock);
479 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
480 ("we expect to read %u bytes\n"), buflen);
483 if (buflen == GNUNET_NO)
486 buf = GNUNET_malloc (buflen);
487 fromlen = sizeof (addr);
489 memset (&addr, 0, fromlen);
491 GNUNET_NETWORK_socket_recvfrom (udp_sock, buf, buflen,
492 (struct sockaddr *) &addr, &fromlen);
495 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
496 ("socket_recv returned %u, src_addr_len is %u\n"), ret,
505 msg = (struct UDPMessage *) buf;
508 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
509 ("header reports message size of %d\n"),
510 ntohs (msg->header.size));
512 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
513 ("header reports message type of %d\n"),
514 ntohs (msg->header.type));
516 if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
519 GNUNET_NETWORK_fdset_zero (plugin->rs);
520 GNUNET_NETWORK_fdset_set (plugin->rs, udp_sock);
523 msgbuf = (char *)&msg[1];
524 sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
525 memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
529 tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
531 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "UDP", _
532 ("offset is %d, tsize is %d (UDPMessage size is %d)\n"),
533 offset, tsize, sizeof(struct UDPMessage));
536 if (fromlen == sizeof (struct sockaddr_in))
538 s4 = (const struct sockaddr_in*) &addr;
539 t4.u_port = s4->sin_port;
540 t4.ipv4_addr = s4->sin_addr.s_addr;
542 calen = sizeof (struct IPv4UdpAddress);
544 else if (fromlen == sizeof (struct sockaddr_in6))
546 s6 = (const struct sockaddr_in6*) &addr;
547 t6.u6_port = s6->sin6_port;
548 memcpy (&t6.ipv6_addr,
550 sizeof (struct in6_addr));
552 calen = sizeof (struct IPv6UdpAddress);
560 while (offset < tsize)
562 currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
564 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
565 ("processing msg %d: type %d, size %d at offset %d\n"),
566 count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
568 plugin->env->receive (plugin->env->cls,
569 sender, currhdr, UDP_DIRECT_DISTANCE,
571 offset += ntohs(currhdr->size);
573 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
574 ("offset now %d, tsize %d\n"),
580 GNUNET_free (sender);
583 plugin->select_task =
584 GNUNET_SCHEDULER_add_select (plugin->env->sched,
585 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
586 GNUNET_SCHEDULER_NO_TASK,
587 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
588 NULL, &udp_plugin_select, plugin);
593 * Create a UDP socket. If possible, use IPv6, otherwise
595 * @param cls closure, the 'struct Plugin*'
597 static struct GNUNET_NETWORK_Handle *
598 udp_transport_server_start (void *cls)
600 struct Plugin *plugin = cls;
601 struct GNUNET_NETWORK_Handle *desc;
602 struct sockaddr_in serverAddrv4;
603 struct sockaddr_in6 serverAddrv6;
604 struct sockaddr *serverAddr;
609 GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "GNUNETD",
612 desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 17);
615 memset (&serverAddrv6, 0, sizeof (serverAddrv6));
616 #if HAVE_SOCKADDR_IN_SIN_LEN
617 serverAddrv6.sin6_len = sizeof (serverAddrv6);
619 serverAddrv6.sin6_family = AF_INET6;
620 serverAddrv6.sin6_addr = in6addr_any;
621 serverAddrv6.sin6_port = htons (plugin->open_port);
622 addrlen = sizeof (serverAddrv6);
623 serverAddr = (struct sockaddr *) &serverAddrv6;
628 desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 17);
631 GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
636 memset (&serverAddrv4, 0, sizeof (serverAddrv4));
637 #if HAVE_SOCKADDR_IN_SIN_LEN
638 serverAddrv4.sin_len = sizeof (serverAddrv4);
640 serverAddrv4.sin_family = AF_INET;
641 serverAddrv4.sin_addr.s_addr = INADDR_ANY;
642 serverAddrv4.sin_port = htons (plugin->open_port);
643 addrlen = sizeof (serverAddrv4);
644 serverAddr = (struct sockaddr *) &serverAddrv4;
650 GNUNET_assert (GNUNET_NETWORK_socket_bind (desc, serverAddr, addrlen) ==
654 plugin->rs = GNUNET_NETWORK_fdset_create ();
656 GNUNET_NETWORK_fdset_zero (plugin->rs);
657 GNUNET_NETWORK_fdset_set (plugin->rs, desc);
659 plugin->select_task =
660 GNUNET_SCHEDULER_add_select (plugin->env->sched,
661 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
662 GNUNET_SCHEDULER_NO_TASK,
663 GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
664 NULL, &udp_plugin_select, plugin);
671 * Check if the given port is plausible (must be either
672 * our listen port or our advertised port). If it is
673 * neither, we return one of these two ports at random.
675 * @return either in_port or a more plausible port
678 check_port (struct Plugin *plugin, uint16_t in_port)
680 if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
682 return (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
684 ? plugin->open_port : plugin->adv_port;
689 * Another peer has suggested an address for this peer and transport
690 * plugin. Check that this could be a valid address. This function
691 * is not expected to 'validate' the address in the sense of trying to
692 * connect to it but simply to see if the binary format is technically
693 * legal for establishing a connection.
695 * @param cls handle to Plugin
696 * @param addr address to check
697 * @param addrlen length of addr
698 * @return GNUNET_OK if this is a plausible address for this peer
699 * and transport, GNUNET_SYSERR if not
702 udp_check_address (void *cls, void *addr, size_t addrlen)
704 struct Plugin *plugin = cls;
705 struct IPv4UdpAddress *v4;
706 struct IPv6UdpAddress *v6;
708 if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
709 (addrlen != sizeof (struct IPv6UdpAddress)))
712 return GNUNET_SYSERR;
714 if (addrlen == sizeof (struct IPv4UdpAddress))
716 v4 = (struct IPv4UdpAddress *) addr;
717 v4->u_port = htons (check_port (plugin, ntohs (v4->u_port)));
721 v6 = (struct IPv6UdpAddress *) addr;
722 if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
725 return GNUNET_SYSERR;
727 v6->u6_port = htons (check_port (plugin, ntohs (v6->u6_port)));
734 * Append our port and forward the result.
737 append_port (void *cls, const char *hostname)
739 struct PrettyPrinterContext *ppc = cls;
742 if (hostname == NULL)
744 ppc->asc (ppc->asc_cls, NULL);
748 GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
749 ppc->asc (ppc->asc_cls, ret);
755 * Convert the transports address to a nice, human-readable
759 * @param type name of the transport that generated the address
760 * @param addr one of the addresses of the host, NULL for the last address
761 * the specific address format depends on the transport
762 * @param addrlen length of the address
763 * @param numeric should (IP) addresses be displayed in numeric form?
764 * @param timeout after how long should we give up?
765 * @param asc function to call on each string
766 * @param asc_cls closure for asc
769 udp_plugin_address_pretty_printer (void *cls,
774 struct GNUNET_TIME_Relative timeout,
775 GNUNET_TRANSPORT_AddressStringCallback asc,
778 struct Plugin *plugin = cls;
779 struct PrettyPrinterContext *ppc;
781 struct sockaddr_in a4;
782 struct sockaddr_in6 a6;
783 const struct IPv4UdpAddress *t4;
784 const struct IPv6UdpAddress *t6;
788 if (addrlen == sizeof (struct IPv6UdpAddress))
791 memset (&a6, 0, sizeof (a6));
792 a6.sin6_family = AF_INET6;
793 a6.sin6_port = t6->u6_port;
794 port = ntohs (t6->u6_port);
795 memcpy (&a6.sin6_addr,
797 sizeof (struct in6_addr));
801 else if (addrlen == sizeof (struct IPv4UdpAddress))
804 memset (&a4, 0, sizeof (a4));
805 a4.sin_family = AF_INET;
806 a4.sin_port = t4->u_port;
807 a4.sin_addr.s_addr = t4->ipv4_addr;
808 port = ntohs (t4->u_port);
814 /* invalid address */
819 ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
821 ppc->asc_cls = asc_cls;
823 GNUNET_RESOLVER_hostname_get (plugin->env->sched,
827 !numeric, timeout, &append_port, ppc);
833 * Function called for a quick conversion of the binary address to
834 * a numeric address. Note that the caller must not free the
835 * address and that the next call to this function is allowed
836 * to override the address again.
839 * @param addr binary address
840 * @param addrlen length of the address
841 * @return string representing the same address
844 udp_address_to_string (void *cls,
848 static char rbuf[INET6_ADDRSTRLEN + 10];
849 char buf[INET6_ADDRSTRLEN];
853 const struct IPv4UdpAddress *t4;
854 const struct IPv6UdpAddress *t6;
858 if (addrlen == sizeof (struct IPv6UdpAddress))
862 port = ntohs (t6->u6_port);
863 memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
866 else if (addrlen == sizeof (struct IPv4UdpAddress))
870 port = ntohs (t4->u_port);
871 memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
876 inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
877 GNUNET_snprintf (rbuf,
887 * The exported method. Makes the core api available via a global and
888 * returns the udp transport API.
890 * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
891 * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
894 libgnunet_plugin_transport_udp_init (void *cls)
896 struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
897 struct GNUNET_TRANSPORT_PluginFunctions *api;
898 struct Plugin *plugin;
899 struct GNUNET_SERVICE_Context *service;
900 unsigned long long aport;
901 unsigned long long bport;
902 unsigned long long mtu;
904 service = GNUNET_SERVICE_start ("transport-udp", env->sched, env->cfg);
907 GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", _
908 ("Failed to start service for `%s' transport plugin.\n"),
914 GNUNET_CONFIGURATION_get_value_number (env->cfg,
920 GNUNET_CONFIGURATION_get_value_number (env->cfg,
923 &aport)) && (aport > 65535)))
925 GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
928 ("Require valid port number for service `%s' in configuration!\n"),
930 GNUNET_SERVICE_stop (service);
938 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
940 _("MTU %llu for `%s' is probably too low!\n"), mtu,
943 plugin = GNUNET_malloc (sizeof (struct Plugin));
944 plugin->open_port = bport;
945 plugin->adv_port = aport;
947 api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
950 api->send = &udp_plugin_send;
951 api->disconnect = &udp_disconnect;
952 api->address_pretty_printer = &udp_plugin_address_pretty_printer;
953 api->check_address = &udp_check_address;
954 api->address_to_string = &udp_address_to_string;
955 plugin->service = service;
957 /* FIXME: do the two calls below periodically again and
958 not just once (since the info we get might change...) */
959 GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
960 plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched,
963 HOSTNAME_RESOLVE_TIMEOUT,
964 &process_hostname_ips,
967 udp_sock = udp_transport_server_start (plugin);
969 GNUNET_assert (udp_sock != NULL);
975 libgnunet_plugin_transport_udp_done (void *cls)
977 struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
978 struct Plugin *plugin = api->cls;
980 udp_transport_server_stop (plugin);
981 if (NULL != plugin->hostname_dns)
983 GNUNET_RESOLVER_request_cancel (plugin->hostname_dns);
984 plugin->hostname_dns = NULL;
986 GNUNET_SERVICE_stop (plugin->service);
988 GNUNET_NETWORK_fdset_destroy (plugin->rs);
989 GNUNET_free (plugin);
994 /* end of plugin_transport_udp.c */