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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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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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;
94 broadcast_ipv6_mst_cb (void *cls, void *client,
95 const struct GNUNET_MessageHeader *message)
98 struct Plugin *plugin = cls;
99 struct Mstv6Context *mc = client;
100 const struct GNUNET_MessageHeader *hello;
101 struct UDP_Beacon_Message *msg;
103 msg = (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)));
112 struct GNUNET_ATS_Information atsi[2];
115 atsi[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
116 atsi[0].value = htonl (1);
117 atsi[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
118 atsi[1].value = mc->ats_address_network_type;
119 GNUNET_break (ntohl(mc->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
121 hello = (struct GNUNET_MessageHeader *) &msg[1];
122 plugin->env->receive (plugin->env->cls,
126 (const char *) &mc->addr,
128 plugin->env->update_address_metrics (plugin->env->cls,
130 (const char *) &mc->addr,
133 (struct GNUNET_ATS_Information *) &atsi, 2);
135 GNUNET_STATISTICS_update (plugin->env->stats,
137 ("# IPv6 multicast HELLO beacons received via udp"),
144 broadcast_ipv4_mst_cb (void *cls, void *client,
145 const struct GNUNET_MessageHeader *message)
147 struct Plugin *plugin = cls;
148 struct Mstv4Context *mc = client;
149 const struct GNUNET_MessageHeader *hello;
150 struct UDP_Beacon_Message *msg;
152 msg = (struct UDP_Beacon_Message *) message;
154 if (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON !=
155 ntohs (msg->header.type))
157 LOG (GNUNET_ERROR_TYPE_DEBUG,
158 "Received beacon with %u bytes from peer `%s' via address `%s'\n",
159 ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
160 udp_address_to_string (NULL, &mc->addr, sizeof (mc->addr)));
162 struct GNUNET_ATS_Information atsi[2];
165 atsi[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
166 atsi[0].value = htonl (1);
167 atsi[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
168 atsi[1].value = mc->ats_address_network_type;
169 GNUNET_break (ntohl(mc->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
171 hello = (struct GNUNET_MessageHeader *) &msg[1];
172 plugin->env->receive (plugin->env->cls,
176 (const char *) &mc->addr,
179 plugin->env->update_address_metrics (plugin->env->cls,
181 (const char *) &mc->addr,
184 (struct GNUNET_ATS_Information *) &atsi, 2);
186 GNUNET_STATISTICS_update (plugin->env->stats,
188 ("# IPv4 broadcast HELLO beacons received via udp"),
195 udp_broadcast_receive (struct Plugin *plugin, const char * buf, ssize_t size, struct sockaddr *addr, size_t addrlen)
197 struct GNUNET_ATS_Information ats;
199 if ((GNUNET_YES == plugin->broadcast_ipv4) && (addrlen == sizeof (struct sockaddr_in)))
201 LOG (GNUNET_ERROR_TYPE_DEBUG,
202 "Received IPv4 HELLO beacon broadcast with %i bytes from address %s\n",
203 size, GNUNET_a2s ((const struct sockaddr *) addr, addrlen));
204 struct Mstv4Context *mc;
206 mc = GNUNET_malloc (sizeof (struct Mstv4Context));
207 struct sockaddr_in *av4 = (struct sockaddr_in *) addr;
209 mc->addr.ipv4_addr = av4->sin_addr.s_addr;
210 mc->addr.u4_port = av4->sin_port;
211 ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) addr, addrlen);
212 mc->ats_address_network_type = ats.value;
214 GNUNET_assert (NULL != plugin->broadcast_ipv4_mst);
216 GNUNET_SERVER_mst_receive (plugin->broadcast_ipv4_mst, mc, buf, size,
217 GNUNET_NO, GNUNET_NO))
220 else if ((GNUNET_YES == plugin->broadcast_ipv4) && (addrlen == sizeof (struct sockaddr_in6)))
222 LOG (GNUNET_ERROR_TYPE_DEBUG,
223 "Received IPv6 HELLO beacon broadcast with %i bytes from address %s\n",
224 size, GNUNET_a2s ((const struct sockaddr *) &addr, addrlen));
225 struct Mstv6Context *mc;
227 mc = GNUNET_malloc (sizeof (struct Mstv6Context));
228 struct sockaddr_in6 *av6 = (struct sockaddr_in6 *) addr;
230 mc->addr.ipv6_addr = av6->sin6_addr;
231 mc->addr.u6_port = av6->sin6_port;
232 ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) addr, addrlen);
233 mc->ats_address_network_type = ats.value;
234 GNUNET_assert (NULL != plugin->broadcast_ipv4_mst);
236 GNUNET_SERVER_mst_receive (plugin->broadcast_ipv6_mst, mc, buf, size,
237 GNUNET_NO, GNUNET_NO))
243 prepare_beacon (struct Plugin *plugin, struct UDP_Beacon_Message *msg)
248 const struct GNUNET_MessageHeader *hello;
249 hello = plugin->env->get_our_hello ();
252 hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
253 msg_size = hello_size + sizeof (struct UDP_Beacon_Message);
255 if (hello_size < (sizeof (struct GNUNET_MessageHeader)) ||
256 (msg_size > (UDP_MTU)))
259 msg->sender = *(plugin->env->my_identity);
260 msg->header.size = htons (msg_size);
261 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON);
262 memcpy (&msg[1], hello, hello_size);
267 udp_ipv4_broadcast_send (void *cls,
268 const struct GNUNET_SCHEDULER_TaskContext *tc)
270 struct Plugin *plugin = cls;
273 char buf[65536] GNUNET_ALIGN;
274 struct BroadcastAddress *baddr;
276 plugin->send_ipv4_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
278 msg_size = prepare_beacon(plugin, (struct UDP_Beacon_Message *) &buf);
280 baddr = plugin->ipv4_broadcast_head;
282 while ((msg_size > 0) && (baddr != NULL) && (baddr->addrlen == sizeof (struct sockaddr_in)))
284 struct sockaddr_in *addr = (struct sockaddr_in *) baddr->addr;
286 addr->sin_port = htons (plugin->port);
288 sent = GNUNET_NETWORK_socket_sendto (plugin->sockv4, &buf, msg_size,
289 (const struct sockaddr *) addr,
291 if (sent == GNUNET_SYSERR)
293 if ((ENETUNREACH == errno) || (ENETDOWN == errno))
295 /* "Network unreachable" or "Network down"
297 * This indicates that we just do not have network connectivity
299 GNUNET_log (GNUNET_ERROR_TYPE_BULK | GNUNET_ERROR_TYPE_WARNING,
300 "Network connectivity is down, cannot send beacon!\n");
303 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
307 LOG (GNUNET_ERROR_TYPE_DEBUG,
308 "Sent HELLO beacon broadcast with %i bytes to address %s\n", sent,
309 GNUNET_a2s (baddr->addr, baddr->addrlen));
314 plugin->send_ipv4_broadcast_task =
315 GNUNET_SCHEDULER_add_delayed (plugin->broadcast_interval,
316 &udp_ipv4_broadcast_send, plugin);
320 udp_ipv6_broadcast_send (void *cls,
321 const struct GNUNET_SCHEDULER_TaskContext *tc)
323 struct Plugin *plugin = cls;
326 char buf[65536] GNUNET_ALIGN;
328 plugin->send_ipv6_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
330 msg_size = prepare_beacon(plugin, (struct UDP_Beacon_Message *) &buf);
332 sent = GNUNET_NETWORK_socket_sendto (plugin->sockv6, &buf, msg_size,
333 (const struct sockaddr *)
334 &plugin->ipv6_multicast_address,
335 sizeof (struct sockaddr_in6));
336 if (sent == GNUNET_SYSERR)
338 if ((ENETUNREACH == errno) || (ENETDOWN == errno))
340 /* "Network unreachable" or "Network down"
342 * This indicates that this system is IPv6 enabled, but does not
343 * have a valid global IPv6 address assigned
345 GNUNET_log (GNUNET_ERROR_TYPE_BULK | GNUNET_ERROR_TYPE_WARNING,
346 "Network connectivity is down, cannot send beacon!\n");
349 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
353 LOG (GNUNET_ERROR_TYPE_DEBUG,
354 "Sending IPv6 HELLO beacon broadcast with %i bytes to address %s\n",
356 GNUNET_a2s ((const struct sockaddr *) &plugin->ipv6_multicast_address,
357 sizeof (struct sockaddr_in6)));
359 plugin->send_ipv6_broadcast_task =
360 GNUNET_SCHEDULER_add_delayed (plugin->broadcast_interval,
361 &udp_ipv6_broadcast_send, plugin);
366 iface_proc (void *cls, const char *name, int isDefault,
367 const struct sockaddr *addr, const struct sockaddr *broadcast_addr,
368 const struct sockaddr *netmask, socklen_t addrlen)
370 struct Plugin *plugin = cls;
374 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "address %s for interface %s %p\n ",
375 GNUNET_a2s (addr, addrlen), name, addr);
376 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
377 "broadcast address %s for interface %s %p\n ",
378 GNUNET_a2s (broadcast_addr, addrlen), name, broadcast_addr);
379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "netmask %s for interface %s %p\n ",
380 GNUNET_a2s (netmask, addrlen), name, netmask);
382 /* Collecting broadcast addresses */
383 if (broadcast_addr != NULL)
385 struct BroadcastAddress *ba =
386 GNUNET_malloc (sizeof (struct BroadcastAddress));
387 ba->addr = GNUNET_malloc (addrlen);
388 memcpy (ba->addr, broadcast_addr, addrlen);
389 ba->addrlen = addrlen;
390 GNUNET_CONTAINER_DLL_insert (plugin->ipv4_broadcast_head,
391 plugin->ipv4_broadcast_tail, ba);
399 setup_broadcast (struct Plugin *plugin, struct sockaddr_in6 *serverAddrv6, struct sockaddr_in *serverAddrv4)
401 /* create IPv4 broadcast socket */
402 plugin->broadcast_ipv4 = GNUNET_NO;
403 if (plugin->sockv4 != NULL)
407 if (GNUNET_NETWORK_socket_setsockopt
408 (plugin->sockv4, SOL_SOCKET, SO_BROADCAST, &yes,
409 sizeof (int)) != GNUNET_OK)
411 LOG (GNUNET_ERROR_TYPE_WARNING,
413 ("Failed to set IPv4 broadcast option for broadcast socket on port %d\n"),
414 ntohs (serverAddrv4->sin_port));
418 GNUNET_OS_network_interfaces_list (iface_proc, plugin);
419 plugin->send_ipv4_broadcast_task =
420 GNUNET_SCHEDULER_add_now (&udp_ipv4_broadcast_send, plugin);
422 plugin->broadcast_ipv4_mst =
423 GNUNET_SERVER_mst_create (broadcast_ipv4_mst_cb, plugin);
425 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Broadcasting running\n");
426 plugin->broadcast_ipv4 = GNUNET_YES;
430 plugin->broadcast_ipv6 = GNUNET_NO;
431 if (plugin->sockv6 != NULL)
433 memset (&plugin->ipv6_multicast_address, 0, sizeof (struct sockaddr_in6));
435 inet_pton (AF_INET6, "FF05::13B",
436 &plugin->ipv6_multicast_address.sin6_addr));
438 plugin->ipv6_multicast_address.sin6_family = AF_INET6;
439 plugin->ipv6_multicast_address.sin6_port = htons (plugin->port);
441 plugin->broadcast_ipv6_mst =
442 GNUNET_SERVER_mst_create (broadcast_ipv6_mst_cb, plugin);
444 /* Create IPv6 multicast request */
445 struct ipv6_mreq multicastRequest;
447 multicastRequest.ipv6mr_multiaddr =
448 plugin->ipv6_multicast_address.sin6_addr;
449 /* TODO: 0 selects the "best" interface, tweak to use all interfaces
451 * http://tools.ietf.org/html/rfc2553#section-5.2:
455 * Join a multicast group on a specified local interface. If the
456 * interface index is specified as 0, the kernel chooses the local
457 * interface. For example, some kernels look up the multicast
458 * group in the normal IPv6 routing table and using the resulting
461 multicastRequest.ipv6mr_interface = 0;
463 /* Join the multicast group */
464 if (GNUNET_NETWORK_socket_setsockopt
465 (plugin->sockv6, IPPROTO_IPV6, IPV6_JOIN_GROUP,
466 (char *) &multicastRequest, sizeof (multicastRequest)) != GNUNET_OK)
468 LOG (GNUNET_ERROR_TYPE_WARNING,
469 "Failed to join IPv6 multicast group: IPv6 broadcasting not running\n");
473 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 broadcasting running\n");
474 plugin->send_ipv6_broadcast_task =
475 GNUNET_SCHEDULER_add_now (&udp_ipv6_broadcast_send, plugin);
476 plugin->broadcast_ipv6 = GNUNET_YES;
482 stop_broadcast (struct Plugin *plugin)
484 if (plugin->broadcast_ipv4)
486 if (plugin->send_ipv4_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
488 GNUNET_SCHEDULER_cancel (plugin->send_ipv4_broadcast_task);
489 plugin->send_ipv4_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
492 if (plugin->broadcast_ipv4_mst != NULL)
493 GNUNET_SERVER_mst_destroy (plugin->broadcast_ipv4_mst);
495 while (plugin->ipv4_broadcast_head != NULL)
497 struct BroadcastAddress *p = plugin->ipv4_broadcast_head;
499 GNUNET_CONTAINER_DLL_remove (plugin->ipv4_broadcast_head,
500 plugin->ipv4_broadcast_tail, p);
501 GNUNET_free (p->addr);
506 if (plugin->broadcast_ipv6)
508 /* Create IPv6 multicast request */
509 struct ipv6_mreq multicastRequest;
511 multicastRequest.ipv6mr_multiaddr =
512 plugin->ipv6_multicast_address.sin6_addr;
513 multicastRequest.ipv6mr_interface = 0;
515 /* Join the multicast address */
516 if (GNUNET_NETWORK_socket_setsockopt
517 (plugin->sockv6, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
518 (char *) &multicastRequest, sizeof (multicastRequest)) != GNUNET_OK)
520 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, setsockopt);
524 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 Broadcasting stopped\n");
527 if (plugin->send_ipv6_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
529 GNUNET_SCHEDULER_cancel (plugin->send_ipv6_broadcast_task);
530 plugin->send_ipv6_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
532 if (plugin->broadcast_ipv6_mst != NULL)
533 GNUNET_SERVER_mst_destroy (plugin->broadcast_ipv6_mst);
538 /* end of plugin_transport_udp_broadcasting.c */