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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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
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_new.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))
109 LOG (GNUNET_ERROR_TYPE_DEBUG,
110 "Received beacon with %u bytes from peer `%s' via address `%s'\n",
111 ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
112 udp_address_to_string (NULL, &mc->addr, sizeof (mc->addr)));
114 struct GNUNET_ATS_Information atsi[2];
117 atsi[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
118 atsi[0].value = htonl (1);
119 atsi[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
120 atsi[1].value = mc->ats_address_network_type;
121 GNUNET_break (ntohl(mc->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
123 hello = (struct GNUNET_MessageHeader *) &msg[1];
124 plugin->env->receive (plugin->env->cls, &msg->sender, hello,
125 (const struct GNUNET_ATS_Information *) &atsi, 2, NULL,
126 (const char *) &mc->addr, sizeof (mc->addr));
128 GNUNET_STATISTICS_update (plugin->env->stats,
130 ("# IPv6 multicast HELLO beacons received via udp"),
136 broadcast_ipv4_mst_cb (void *cls, void *client,
137 const struct GNUNET_MessageHeader *message)
139 struct Plugin *plugin = cls;
140 struct Mstv4Context *mc = client;
141 const struct GNUNET_MessageHeader *hello;
142 struct UDP_Beacon_Message *msg;
144 msg = (struct UDP_Beacon_Message *) message;
146 if (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON !=
147 ntohs (msg->header.type))
150 LOG (GNUNET_ERROR_TYPE_DEBUG,
151 "Received beacon with %u bytes from peer `%s' via address `%s'\n",
152 ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
153 udp_address_to_string (NULL, &mc->addr, sizeof (mc->addr)));
155 struct GNUNET_ATS_Information atsi[2];
158 atsi[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
159 atsi[0].value = htonl (1);
160 atsi[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
161 atsi[1].value = mc->ats_address_network_type;
162 GNUNET_break (ntohl(mc->ats_address_network_type) != GNUNET_ATS_NET_UNSPECIFIED);
164 hello = (struct GNUNET_MessageHeader *) &msg[1];
165 plugin->env->receive (plugin->env->cls, &msg->sender, hello,
166 (const struct GNUNET_ATS_Information *) &atsi, 2, NULL,
167 (const char *) &mc->addr, sizeof (mc->addr));
169 GNUNET_STATISTICS_update (plugin->env->stats,
171 ("# IPv4 broadcast HELLO beacons received via udp"),
177 udp_broadcast_receive (struct Plugin *plugin, const char * buf, ssize_t size, struct sockaddr *addr, size_t addrlen)
179 struct GNUNET_ATS_Information ats;
181 if (addrlen == sizeof (struct sockaddr_in))
183 LOG (GNUNET_ERROR_TYPE_DEBUG,
184 "Received IPv4 HELLO beacon broadcast with %i bytes from address %s\n",
185 size, GNUNET_a2s ((const struct sockaddr *) addr, addrlen));
187 struct Mstv4Context *mc;
189 mc = GNUNET_malloc (sizeof (struct Mstv4Context));
190 struct sockaddr_in *av4 = (struct sockaddr_in *) addr;
192 mc->addr.ipv4_addr = av4->sin_addr.s_addr;
193 mc->addr.u4_port = av4->sin_port;
194 ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) addr, addrlen);
195 mc->ats_address_network_type = ats.value;
197 GNUNET_SERVER_mst_receive (plugin->broadcast_ipv4_mst, mc, buf, size,
198 GNUNET_NO, GNUNET_NO))
201 else if (addrlen == sizeof (struct sockaddr_in6))
203 LOG (GNUNET_ERROR_TYPE_DEBUG,
204 "Received IPv6 HELLO beacon broadcast with %i bytes from address %s\n",
205 size, GNUNET_a2s ((const struct sockaddr *) &addr, addrlen));
207 struct Mstv6Context *mc;
209 mc = GNUNET_malloc (sizeof (struct Mstv6Context));
210 struct sockaddr_in6 *av6 = (struct sockaddr_in6 *) addr;
212 mc->addr.ipv6_addr = av6->sin6_addr;
213 mc->addr.u6_port = av6->sin6_port;
214 ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) addr, addrlen);
215 mc->ats_address_network_type = ats.value;
218 GNUNET_SERVER_mst_receive (plugin->broadcast_ipv6_mst, mc, buf, size,
219 GNUNET_NO, GNUNET_NO))
225 udp_ipv4_broadcast_send (void *cls,
226 const struct GNUNET_SCHEDULER_TaskContext *tc)
228 struct Plugin *plugin = cls;
234 const struct GNUNET_MessageHeader *hello;
235 struct UDP_Beacon_Message *msg;
236 struct BroadcastAddress *baddr;
238 plugin->send_ipv4_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
240 hello = plugin->env->get_our_hello ();
241 hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
242 msg_size = hello_size + sizeof (struct UDP_Beacon_Message);
244 if (hello_size < (sizeof (struct GNUNET_MessageHeader)) ||
245 (msg_size > (UDP_MTU)))
248 msg = (struct UDP_Beacon_Message *) buf;
249 msg->sender = *(plugin->env->my_identity);
250 msg->header.size = ntohs (msg_size);
251 msg->header.type = ntohs (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON);
252 memcpy (&msg[1], hello, hello_size);
255 baddr = plugin->ipv4_broadcast_head;
257 while ((baddr != NULL) && (baddr->addrlen == sizeof (struct sockaddr_in)))
259 struct sockaddr_in *addr = (struct sockaddr_in *) baddr->addr;
261 addr->sin_port = htons (plugin->port);
264 GNUNET_NETWORK_socket_sendto (plugin->sockv4, msg, msg_size,
265 (const struct sockaddr *) addr,
267 if (sent == GNUNET_SYSERR)
268 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
270 LOG (GNUNET_ERROR_TYPE_DEBUG,
271 "Sent HELLO beacon broadcast with %i bytes to address %s\n", sent,
272 GNUNET_a2s (baddr->addr, baddr->addrlen));
276 plugin->send_ipv4_broadcast_task =
277 GNUNET_SCHEDULER_add_delayed (plugin->broadcast_interval,
278 &udp_ipv4_broadcast_send, plugin);
282 udp_ipv6_broadcast_send (void *cls,
283 const struct GNUNET_SCHEDULER_TaskContext *tc)
285 struct Plugin *plugin = cls;
291 const struct GNUNET_MessageHeader *hello;
292 struct UDP_Beacon_Message *msg;
294 plugin->send_ipv6_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
296 hello = plugin->env->get_our_hello ();
297 hello_size = GNUNET_HELLO_size ((struct GNUNET_HELLO_Message *) hello);
298 msg_size = hello_size + sizeof (struct UDP_Beacon_Message);
300 if (hello_size < (sizeof (struct GNUNET_MessageHeader)) ||
301 (msg_size > (UDP_MTU)))
304 msg = (struct UDP_Beacon_Message *) buf;
305 msg->sender = *(plugin->env->my_identity);
306 msg->header.size = ntohs (msg_size);
307 msg->header.type = ntohs (GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON);
308 memcpy (&msg[1], hello, hello_size);
312 GNUNET_NETWORK_socket_sendto (plugin->sockv6, msg, msg_size,
313 (const struct sockaddr *)
314 &plugin->ipv6_multicast_address,
315 sizeof (struct sockaddr_in6));
316 if (sent == GNUNET_SYSERR)
317 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "sendto");
319 LOG (GNUNET_ERROR_TYPE_DEBUG,
320 "Sending IPv6 HELLO beacon broadcast with %i bytes to address %s\n",
322 GNUNET_a2s ((const struct sockaddr *) &plugin->ipv6_multicast_address,
323 sizeof (struct sockaddr_in6)));
327 plugin->send_ipv6_broadcast_task =
328 GNUNET_SCHEDULER_add_delayed (plugin->broadcast_interval,
329 &udp_ipv6_broadcast_send, plugin);
334 iface_proc (void *cls, const char *name, int isDefault,
335 const struct sockaddr *addr, const struct sockaddr *broadcast_addr,
336 const struct sockaddr *netmask, socklen_t addrlen)
338 struct Plugin *plugin = cls;
342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "address %s for interface %s %p\n ",
343 GNUNET_a2s (addr, addrlen), name, addr);
344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
345 "broadcast address %s for interface %s %p\n ",
346 GNUNET_a2s (broadcast_addr, addrlen), name, broadcast_addr);
347 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "netmask %s for interface %s %p\n ",
348 GNUNET_a2s (netmask, addrlen), name, netmask);
351 /* Collecting broadcast addresses */
352 if (broadcast_addr != NULL)
354 struct BroadcastAddress *ba =
355 GNUNET_malloc (sizeof (struct BroadcastAddress));
356 ba->addr = GNUNET_malloc (addrlen);
357 memcpy (ba->addr, broadcast_addr, addrlen);
358 ba->addrlen = addrlen;
359 GNUNET_CONTAINER_DLL_insert (plugin->ipv4_broadcast_head,
360 plugin->ipv4_broadcast_tail, ba);
368 setup_broadcast (struct Plugin *plugin, struct sockaddr_in6 *serverAddrv6, struct sockaddr_in *serverAddrv4)
370 /* create IPv4 broadcast socket */
371 plugin->broadcast_ipv4 = GNUNET_NO;
372 if (plugin->sockv4 != NULL)
376 if (GNUNET_NETWORK_socket_setsockopt
377 (plugin->sockv4, SOL_SOCKET, SO_BROADCAST, &yes,
378 sizeof (int)) != GNUNET_OK)
380 LOG (GNUNET_ERROR_TYPE_WARNING,
382 ("Failed to set IPv4 broadcast option for broadcast socket on port %d\n"),
383 ntohs (serverAddrv4->sin_port));
387 GNUNET_OS_network_interfaces_list (iface_proc, plugin);
388 plugin->send_ipv4_broadcast_task =
389 GNUNET_SCHEDULER_add_now (&udp_ipv4_broadcast_send, plugin);
391 plugin->broadcast_ipv4_mst =
392 GNUNET_SERVER_mst_create (broadcast_ipv4_mst_cb, plugin);
394 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Broadcasting running\n");
395 plugin->broadcast_ipv4 = GNUNET_YES;
399 plugin->broadcast_ipv6 = GNUNET_NO;
400 if (plugin->sockv6 != NULL)
402 memset (&plugin->ipv6_multicast_address, 0, sizeof (struct sockaddr_in6));
404 inet_pton (AF_INET6, "FF05::13B",
405 &plugin->ipv6_multicast_address.sin6_addr));
407 plugin->ipv6_multicast_address.sin6_family = AF_INET6;
408 plugin->ipv6_multicast_address.sin6_port = htons (plugin->port);
410 plugin->broadcast_ipv6_mst =
411 GNUNET_SERVER_mst_create (broadcast_ipv6_mst_cb, plugin);
413 /* Create IPv6 multicast request */
414 struct ipv6_mreq multicastRequest;
416 multicastRequest.ipv6mr_multiaddr =
417 plugin->ipv6_multicast_address.sin6_addr;
418 /* TODO: 0 selects the "best" interface, tweak to use all interfaces
420 * http://tools.ietf.org/html/rfc2553#section-5.2:
424 * Join a multicast group on a specified local interface. If the
425 * interface index is specified as 0, the kernel chooses the local
426 * interface. For example, some kernels look up the multicast
427 * group in the normal IPv6 routing table and using the resulting
430 multicastRequest.ipv6mr_interface = 0;
432 /* Join the multicast group */
433 if (GNUNET_NETWORK_socket_setsockopt
434 (plugin->sockv6, IPPROTO_IPV6, IPV6_JOIN_GROUP,
435 (char *) &multicastRequest, sizeof (multicastRequest)) != GNUNET_OK)
437 LOG (GNUNET_ERROR_TYPE_WARNING,
438 "Failed to join IPv6 multicast group: IPv6 broadcasting not running\n");
443 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 broadcasting running\n");
445 plugin->send_ipv6_broadcast_task =
446 GNUNET_SCHEDULER_add_now (&udp_ipv6_broadcast_send, plugin);
447 plugin->broadcast_ipv6 = GNUNET_YES;
453 stop_broadcast (struct Plugin *plugin)
455 if (plugin->broadcast_ipv4)
457 if (plugin->send_ipv4_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
459 GNUNET_SCHEDULER_cancel (plugin->send_ipv4_broadcast_task);
460 plugin->send_ipv4_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
463 if (plugin->broadcast_ipv4_mst != NULL)
464 GNUNET_SERVER_mst_destroy (plugin->broadcast_ipv4_mst);
466 while (plugin->ipv4_broadcast_head != NULL)
468 struct BroadcastAddress *p = plugin->ipv4_broadcast_head;
470 GNUNET_CONTAINER_DLL_remove (plugin->ipv4_broadcast_head,
471 plugin->ipv4_broadcast_tail, p);
472 GNUNET_free (p->addr);
477 if (plugin->broadcast_ipv6)
479 /* Create IPv6 multicast request */
480 struct ipv6_mreq multicastRequest;
482 multicastRequest.ipv6mr_multiaddr =
483 plugin->ipv6_multicast_address.sin6_addr;
484 multicastRequest.ipv6mr_interface = 0;
486 /* Join the multicast address */
487 if (GNUNET_NETWORK_socket_setsockopt
488 (plugin->sockv6, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
489 (char *) &multicastRequest, sizeof (multicastRequest)) != GNUNET_OK)
491 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, setsockopt);
496 LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv6 Broadcasting stopped\n");
500 if (plugin->send_ipv6_broadcast_task != GNUNET_SCHEDULER_NO_TASK)
502 GNUNET_SCHEDULER_cancel (plugin->send_ipv6_broadcast_task);
503 plugin->send_ipv6_broadcast_task = GNUNET_SCHEDULER_NO_TASK;
505 if (plugin->broadcast_ipv6_mst != NULL)
506 GNUNET_SERVER_mst_destroy (plugin->broadcast_ipv6_mst);
511 /* end of plugin_transport_udp_broadcasting.c */