2 This file is part of GNUnet
3 (C) 2010, 2011 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 3, or (at your
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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22 * @file transport/plugin_transport_udp_broadcasting.c
23 * @brief Neighbour discovery with UDP
24 * @author Christian Grothoff
25 * @author Matthias Wachs
28 #include "plugin_transport_udp.h"
29 #include "gnunet_hello_lib.h"
30 #include "gnunet_util_lib.h"
31 #include "gnunet_fragmentation_lib.h"
32 #include "gnunet_nat_lib.h"
33 #include "gnunet_protocols.h"
34 #include "gnunet_resolver_service.h"
35 #include "gnunet_signatures.h"
36 #include "gnunet_constants.h"
37 #include "gnunet_statistics_service.h"
38 #include "gnunet_transport_service.h"
39 #include "gnunet_transport_plugin.h"
40 #include "transport.h"
42 #define LOG(kind,...) GNUNET_log_from (kind, "transport-udp", __VA_ARGS__)
45 struct UDP_Beacon_Message
50 struct GNUNET_MessageHeader header;
53 * What is the identity of the sender
55 struct GNUNET_PeerIdentity sender;
59 struct BroadcastAddress
61 struct BroadcastAddress *next;
62 struct BroadcastAddress *prev;
71 struct Plugin *plugin;
73 struct IPv4UdpAddress addr;
75 * ATS network type in NBO
77 uint32_t ats_address_network_type;
82 struct Plugin *plugin;
84 struct IPv6UdpAddress addr;
86 * ATS network type in NBO
88 uint32_t ats_address_network_type;
93 broadcast_ipv6_mst_cb (void *cls, void *client,
94 const struct GNUNET_MessageHeader *message)
97 struct Plugin *plugin = cls;
98 struct Mstv6Context *mc = client;
99 const struct GNUNET_MessageHeader *hello;
100 const struct UDP_Beacon_Message *msg;
101 struct GNUNET_ATS_Information atsi;
103 msg = (const struct UDP_Beacon_Message *) message;
105 if (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON !=
106 ntohs (msg->header.type))
108 LOG (GNUNET_ERROR_TYPE_DEBUG,
109 "Received beacon with %u bytes from peer `%s' via address `%s'\n",
110 ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
111 udp_address_to_string (NULL, &mc->addr, sizeof (mc->addr)));
114 atsi.type = htonl (GNUNET_ATS_NETWORK_TYPE);
115 atsi.value = mc->ats_address_network_type;
116 GNUNET_break (ntohl(mc->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
118 hello = (struct GNUNET_MessageHeader *) &msg[1];
119 plugin->env->receive (plugin->env->cls,
123 (const char *) &mc->addr,
125 plugin->env->update_address_metrics (plugin->env->cls,
127 (const char *) &mc->addr,
132 GNUNET_STATISTICS_update (plugin->env->stats,
134 ("# IPv6 multicast HELLO beacons received via udp"),
142 broadcast_ipv4_mst_cb (void *cls, void *client,
143 const struct GNUNET_MessageHeader *message)
145 struct Plugin *plugin = cls;
146 struct Mstv4Context *mc = client;
147 const struct GNUNET_MessageHeader *hello;
148 const struct UDP_Beacon_Message *msg;
149 struct GNUNET_ATS_Information atsi;
151 msg = (const struct UDP_Beacon_Message *) message;
153 if (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON !=
154 ntohs (msg->header.type))
156 LOG (GNUNET_ERROR_TYPE_DEBUG,
157 "Received beacon with %u bytes from peer `%s' via address `%s'\n",
158 ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
159 udp_address_to_string (NULL, &mc->addr, sizeof (mc->addr)));
163 atsi.type = htonl (GNUNET_ATS_NETWORK_TYPE);
164 atsi.value = mc->ats_address_network_type;
165 GNUNET_break (ntohl(mc->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
167 hello = (struct GNUNET_MessageHeader *) &msg[1];
168 plugin->env->receive (plugin->env->cls,
172 (const char *) &mc->addr,
175 plugin->env->update_address_metrics (plugin->env->cls,
177 (const char *) &mc->addr,
182 GNUNET_STATISTICS_update (plugin->env->stats,
184 ("# IPv4 broadcast HELLO beacons received via udp"),
192 udp_broadcast_receive (struct Plugin *plugin,
195 const struct sockaddr *addr,
198 struct GNUNET_ATS_Information ats;
200 if ((GNUNET_YES == plugin->broadcast_ipv4) && (addrlen == sizeof (struct sockaddr_in)))
202 LOG (GNUNET_ERROR_TYPE_DEBUG,
203 "Received IPv4 HELLO beacon broadcast with %i bytes from address %s\n",
204 size, GNUNET_a2s ((const struct sockaddr *) addr, addrlen));
205 struct Mstv4Context *mc;
207 mc = GNUNET_malloc (sizeof (struct Mstv4Context));
208 struct sockaddr_in *av4 = (struct sockaddr_in *) addr;
210 mc->addr.ipv4_addr = av4->sin_addr.s_addr;
211 mc->addr.u4_port = av4->sin_port;
212 ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) addr, addrlen);
213 mc->ats_address_network_type = ats.value;
215 GNUNET_assert (NULL != plugin->broadcast_ipv4_mst);
217 GNUNET_SERVER_mst_receive (plugin->broadcast_ipv4_mst, mc, buf, size,
218 GNUNET_NO, GNUNET_NO))
221 else if ((GNUNET_YES == plugin->broadcast_ipv4) && (addrlen == sizeof (struct sockaddr_in6)))
223 LOG (GNUNET_ERROR_TYPE_DEBUG,
224 "Received IPv6 HELLO beacon broadcast with %i bytes from address %s\n",
225 size, GNUNET_a2s ((const struct sockaddr *) &addr, addrlen));
226 struct Mstv6Context *mc;
228 mc = GNUNET_malloc (sizeof (struct Mstv6Context));
229 struct sockaddr_in6 *av6 = (struct sockaddr_in6 *) addr;
231 mc->addr.ipv6_addr = av6->sin6_addr;
232 mc->addr.u6_port = av6->sin6_port;
233 ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) addr, addrlen);
234 mc->ats_address_network_type = ats.value;
235 GNUNET_assert (NULL != plugin->broadcast_ipv4_mst);
237 GNUNET_SERVER_mst_receive (plugin->broadcast_ipv6_mst, mc, buf, size,
238 GNUNET_NO, GNUNET_NO))
245 prepare_beacon (struct Plugin *plugin, struct UDP_Beacon_Message *msg)
250 const struct GNUNET_MessageHeader *hello;
251 hello = plugin->env->get_our_hello ();
254 hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
255 msg_size = hello_size + sizeof (struct UDP_Beacon_Message);
257 if (hello_size < (sizeof (struct GNUNET_MessageHeader)) ||
258 (msg_size > (UDP_MTU)))
261 msg->sender = *(plugin->env->my_identity);
262 msg->header.size = htons (msg_size);
263 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON);
264 memcpy (&msg[1], hello, hello_size);
270 udp_ipv4_broadcast_send (void *cls,
271 const struct GNUNET_SCHEDULER_TaskContext *tc)
273 struct Plugin *plugin = cls;
276 char buf[65536] GNUNET_ALIGN;
277 struct BroadcastAddress *baddr;
279 plugin->send_ipv4_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
281 msg_size = prepare_beacon(plugin, (struct UDP_Beacon_Message *) &buf);
283 baddr = plugin->ipv4_broadcast_head;
285 while ((msg_size > 0) && (baddr != NULL) && (baddr->addrlen == sizeof (struct sockaddr_in)))
287 struct sockaddr_in *addr = (struct sockaddr_in *) baddr->addr;
289 addr->sin_port = htons (plugin->port);
291 sent = GNUNET_NETWORK_socket_sendto (plugin->sockv4, &buf, msg_size,
292 (const struct sockaddr *) addr,
294 if (sent == GNUNET_SYSERR)
296 if ((ENETUNREACH == errno) || (ENETDOWN == errno))
298 /* "Network unreachable" or "Network down"
300 * This indicates that we just do not have network connectivity
302 GNUNET_log (GNUNET_ERROR_TYPE_BULK | GNUNET_ERROR_TYPE_WARNING,
303 "Network connectivity is down, cannot send beacon!\n");
306 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
310 LOG (GNUNET_ERROR_TYPE_DEBUG,
311 "Sent HELLO beacon broadcast with %i bytes to address %s\n", sent,
312 GNUNET_a2s (baddr->addr, baddr->addrlen));
317 plugin->send_ipv4_broadcast_task =
318 GNUNET_SCHEDULER_add_delayed (plugin->broadcast_interval,
319 &udp_ipv4_broadcast_send, plugin);
324 udp_ipv6_broadcast_send (void *cls,
325 const struct GNUNET_SCHEDULER_TaskContext *tc)
327 struct Plugin *plugin = cls;
330 char buf[65536] GNUNET_ALIGN;
332 plugin->send_ipv6_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
334 msg_size = prepare_beacon(plugin, (struct UDP_Beacon_Message *) &buf);
335 sent = GNUNET_NETWORK_socket_sendto (plugin->sockv6, &buf, msg_size,
336 (const struct sockaddr *)
337 &plugin->ipv6_multicast_address,
338 sizeof (struct sockaddr_in6));
339 if (sent == GNUNET_SYSERR)
341 if ((ENETUNREACH == errno) || (ENETDOWN == errno))
343 /* "Network unreachable" or "Network down"
345 * This indicates that this system is IPv6 enabled, but does not
346 * have a valid global IPv6 address assigned
348 GNUNET_log (GNUNET_ERROR_TYPE_BULK | GNUNET_ERROR_TYPE_WARNING,
349 "Network connectivity is down, cannot send beacon!\n");
352 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
356 LOG (GNUNET_ERROR_TYPE_DEBUG,
357 "Sending IPv6 HELLO beacon broadcast with %i bytes to address %s\n",
359 GNUNET_a2s ((const struct sockaddr *) &plugin->ipv6_multicast_address,
360 sizeof (struct sockaddr_in6)));
362 plugin->send_ipv6_broadcast_task =
363 GNUNET_SCHEDULER_add_delayed (plugin->broadcast_interval,
364 &udp_ipv6_broadcast_send, plugin);
369 iface_proc (void *cls, const char *name, int isDefault,
370 const struct sockaddr *addr, const struct sockaddr *broadcast_addr,
371 const struct sockaddr *netmask, socklen_t addrlen)
373 struct Plugin *plugin = cls;
377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "address %s for interface %s %p\n ",
378 GNUNET_a2s (addr, addrlen), name, addr);
379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
380 "broadcast address %s for interface %s %p\n ",
381 GNUNET_a2s (broadcast_addr, addrlen), name, broadcast_addr);
382 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "netmask %s for interface %s %p\n ",
383 GNUNET_a2s (netmask, addrlen), name, netmask);
385 /* Collecting broadcast addresses */
386 if (broadcast_addr != NULL)
388 struct BroadcastAddress *ba =
389 GNUNET_malloc (sizeof (struct BroadcastAddress));
390 ba->addr = GNUNET_malloc (addrlen);
391 memcpy (ba->addr, broadcast_addr, addrlen);
392 ba->addrlen = addrlen;
393 GNUNET_CONTAINER_DLL_insert (plugin->ipv4_broadcast_head,
394 plugin->ipv4_broadcast_tail, ba);
402 setup_broadcast (struct Plugin *plugin, struct sockaddr_in6 *server_addrv6, struct sockaddr_in *server_addrv4)
404 const struct GNUNET_MessageHeader *hello;
405 hello = plugin->env->get_our_hello ();
407 if (GNUNET_YES == GNUNET_HELLO_is_friend_only((const struct GNUNET_HELLO_Message *) hello))
409 LOG (GNUNET_ERROR_TYPE_WARNING,
410 _("Disabling HELLO broadcasting due to friend-to-friend only configuration!\n"));
415 /* create IPv4 broadcast socket */
416 plugin->broadcast_ipv4 = GNUNET_NO;
417 if ((GNUNET_YES == plugin->enable_ipv4) && (plugin->sockv4 != NULL))
421 if (GNUNET_NETWORK_socket_setsockopt
422 (plugin->sockv4, SOL_SOCKET, SO_BROADCAST, &yes,
423 sizeof (int)) != GNUNET_OK)
425 LOG (GNUNET_ERROR_TYPE_WARNING,
427 ("Failed to set IPv4 broadcast option for broadcast socket on port %d\n"),
428 ntohs (server_addrv4->sin_port));
432 GNUNET_OS_network_interfaces_list (&iface_proc, plugin);
433 plugin->send_ipv4_broadcast_task =
434 GNUNET_SCHEDULER_add_now (&udp_ipv4_broadcast_send, plugin);
436 plugin->broadcast_ipv4_mst =
437 GNUNET_SERVER_mst_create (broadcast_ipv4_mst_cb, plugin);
439 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Broadcasting running\n");
440 plugin->broadcast_ipv4 = GNUNET_YES;
444 plugin->broadcast_ipv6 = GNUNET_NO;
445 if ((GNUNET_YES == plugin->enable_ipv6) && (plugin->sockv6 != NULL))
447 memset (&plugin->ipv6_multicast_address, 0, sizeof (struct sockaddr_in6));
449 inet_pton (AF_INET6, "FF05::13B",
450 &plugin->ipv6_multicast_address.sin6_addr));
452 plugin->ipv6_multicast_address.sin6_family = AF_INET6;
453 plugin->ipv6_multicast_address.sin6_port = htons (plugin->port);
455 plugin->broadcast_ipv6_mst =
456 GNUNET_SERVER_mst_create (broadcast_ipv6_mst_cb, plugin);
458 /* Create IPv6 multicast request */
459 struct ipv6_mreq multicastRequest;
461 multicastRequest.ipv6mr_multiaddr =
462 plugin->ipv6_multicast_address.sin6_addr;
463 /* TODO: 0 selects the "best" interface, tweak to use all interfaces
465 * http://tools.ietf.org/html/rfc2553#section-5.2:
469 * Join a multicast group on a specified local interface. If the
470 * interface index is specified as 0, the kernel chooses the local
471 * interface. For example, some kernels look up the multicast
472 * group in the normal IPv6 routing table and using the resulting
475 multicastRequest.ipv6mr_interface = 0;
477 /* Join the multicast group */
478 if (GNUNET_NETWORK_socket_setsockopt
479 (plugin->sockv6, IPPROTO_IPV6, IPV6_JOIN_GROUP,
480 (char *) &multicastRequest, sizeof (multicastRequest)) != GNUNET_OK)
482 LOG (GNUNET_ERROR_TYPE_WARNING,
483 "Failed to join IPv6 multicast group: IPv6 broadcasting not running\n");
487 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 broadcasting running\n");
488 plugin->send_ipv6_broadcast_task =
489 GNUNET_SCHEDULER_add_now (&udp_ipv6_broadcast_send, plugin);
490 plugin->broadcast_ipv6 = GNUNET_YES;
497 stop_broadcast (struct Plugin *plugin)
499 if (plugin->broadcast_ipv4)
501 if (plugin->send_ipv4_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
503 GNUNET_SCHEDULER_cancel (plugin->send_ipv4_broadcast_task);
504 plugin->send_ipv4_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
507 if (plugin->broadcast_ipv4_mst != NULL)
508 GNUNET_SERVER_mst_destroy (plugin->broadcast_ipv4_mst);
510 while (plugin->ipv4_broadcast_head != NULL)
512 struct BroadcastAddress *p = plugin->ipv4_broadcast_head;
514 GNUNET_CONTAINER_DLL_remove (plugin->ipv4_broadcast_head,
515 plugin->ipv4_broadcast_tail, p);
516 GNUNET_free (p->addr);
521 if (plugin->broadcast_ipv6)
523 /* Create IPv6 multicast request */
524 struct ipv6_mreq multicastRequest;
526 multicastRequest.ipv6mr_multiaddr =
527 plugin->ipv6_multicast_address.sin6_addr;
528 multicastRequest.ipv6mr_interface = 0;
530 /* Join the multicast address */
531 if (GNUNET_NETWORK_socket_setsockopt
532 (plugin->sockv6, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
533 (char *) &multicastRequest, sizeof (multicastRequest)) != GNUNET_OK)
535 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, setsockopt);
539 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 Broadcasting stopped\n");
542 if (plugin->send_ipv6_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
544 GNUNET_SCHEDULER_cancel (plugin->send_ipv6_broadcast_task);
545 plugin->send_ipv6_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
547 if (plugin->broadcast_ipv6_mst != NULL)
548 GNUNET_SERVER_mst_destroy (plugin->broadcast_ipv6_mst);
553 /* end of plugin_transport_udp_broadcasting.c */