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,
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22 * @file transport/gnunet-service-transport-new.c
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
28 #include "gnunet_statistics_service.h"
29 #include "gnunet_transport_service.h"
30 #include "gnunet_peerinfo_service.h"
31 #include "gnunet_ats_service.h"
32 #include "gnunet-service-transport.h"
33 #include "gnunet-service-transport_blacklist.h"
34 #include "gnunet-service-transport_clients.h"
35 #include "gnunet-service-transport_hello.h"
36 #include "gnunet-service-transport_neighbours.h"
37 #include "gnunet-service-transport_plugins.h"
38 #include "gnunet-service-transport_validation.h"
39 #include "transport.h"
46 struct GNUNET_STATISTICS_Handle *GST_stats;
49 * Configuration handle.
51 const struct GNUNET_CONFIGURATION_Handle *GST_cfg;
54 * Configuration handle.
56 struct GNUNET_PeerIdentity GST_my_identity;
59 * Handle to peerinfo service.
61 struct GNUNET_PEERINFO_Handle *GST_peerinfo;
66 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded GST_my_public_key;
71 struct GNUNET_CRYPTO_RsaPrivateKey *GST_my_private_key;
76 struct GNUNET_ATS_Handle *GST_ats;
80 * Transmit our HELLO message to the given (connected) neighbour.
82 * @param cls the 'HELLO' message
83 * @param target a connected neighbour
84 * @param ats performance information (unused)
85 * @param ats_count number of records in ats (unused)
88 transmit_our_hello (void *cls,
89 const struct GNUNET_PeerIdentity *target,
90 const struct GNUNET_TRANSPORT_ATS_Information *ats,
93 const struct GNUNET_MessageHeader *hello = cls;
95 GST_neighbours_send (target,
98 GST_HELLO_ADDRESS_EXPIRATION, NULL, NULL);
103 * My HELLO has changed. Tell everyone who should know.
106 * @param hello new HELLO
109 process_hello_update (void *cls, const struct GNUNET_MessageHeader *hello)
111 GST_clients_broadcast (hello, GNUNET_NO);
112 GST_neighbours_iterate (&transmit_our_hello, (void *) hello);
117 * Try to initiate a connection to the given peer if the blacklist
120 * @param cls closure (unused, NULL)
121 * @param peer identity of peer that was tested
122 * @param result GNUNET_OK if the connection is allowed,
126 try_connect_if_allowed (void *cls,
127 const struct GNUNET_PeerIdentity *peer, int result)
129 if (GNUNET_OK != result)
130 return; /* not allowed */
131 GST_neighbours_try_connect (peer);
136 * Function called by the transport for each received message.
137 * This function should also be called with "NULL" for the
138 * message to signal that the other peer disconnected.
140 * @param cls closure, const char* with the name of the plugin we received the message from
141 * @param peer (claimed) identity of the other peer
142 * @param message the message, NULL if we only care about
143 * learning about the delay until we should receive again -- FIXME!
144 * @param ats performance information
145 * @param ats_count number of records in ats
146 * @param session identifier used for this session (NULL for plugins
147 * that do not offer bi-directional communication to the sender
148 * using the same "connection")
149 * @param sender_address binary address of the sender (if we established the
150 * connection or are otherwise sure of it; should be NULL
151 * for inbound TCP/UDP connections since it it not clear
152 * that we could establish ourselves a connection to that
153 * IP address and get the same system)
154 * @param sender_address_len number of bytes in sender_address
155 * @return how long the plugin should wait until receiving more data
156 * (plugins that do not support this, can ignore the return value)
158 static struct GNUNET_TIME_Relative
159 plugin_env_receive_callback (void *cls,
160 const struct GNUNET_PeerIdentity *peer,
161 const struct GNUNET_MessageHeader *message,
162 const struct GNUNET_TRANSPORT_ATS_Information *ats,
163 uint32_t ats_count, struct Session *session,
164 const char *sender_address,
165 uint16_t sender_address_len)
167 const char *plugin_name = cls;
169 struct GNUNET_TIME_Relative ret;
173 ret = GNUNET_TIME_UNIT_ZERO;
176 type = ntohs (message->type);
179 case GNUNET_MESSAGE_TYPE_HELLO:
180 GST_validation_handle_hello (message);
182 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
184 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
185 "Processing `%s' from `%s'\n",
187 (sender_address != NULL)
188 ? GST_plugins_a2s (plugin_name,
190 sender_address_len) : "<inbound>");
192 GST_validation_handle_ping (peer,
195 session, sender_address, sender_address_len);
197 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
199 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
200 "Processing `%s' from `%s'\n",
202 (sender_address != NULL)
203 ? GST_plugins_a2s (plugin_name,
205 sender_address_len) : "<inbound>");
207 GST_validation_handle_pong (peer, message);
209 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT:
210 (void) GST_blacklist_test_allowed (peer,
211 NULL, &try_connect_if_allowed, NULL);
212 /* TODO: if 'session != NULL', maybe notify ATS that this is now the preferred
213 * way to communicate with this peer (other peer switched transport) */
215 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT:
216 /* TODO: do some validation to prevent an attacker from sending
217 * a fake disconnect message... */
218 GST_neighbours_force_disconnect (peer);
220 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE:
221 GST_neighbours_keepalive (peer);
224 /* should be payload */
225 do_forward = GNUNET_SYSERR;
226 ret = GST_neighbours_calculate_receive_delay (peer,
229 : ntohs (message->size),
231 if (do_forward == GNUNET_YES)
232 GST_clients_broadcast (message, GNUNET_YES);
236 GNUNET_ATS_address_update (GST_ats, peer, GNUNET_TIME_absolute_get (), /* valid at least until right now... */
240 sender_address_len, ats, ats_count);
247 * Function that will be called for each address the transport
248 * is aware that it might be reachable under. Update our HELLO.
250 * @param cls name of the plugin (const char*)
251 * @param add_remove should the address added (YES) or removed (NO) from the
252 * set of valid addresses?
253 * @param addr one of the addresses of the host
254 * the specific address format depends on the transport
255 * @param addrlen length of the address
258 plugin_env_address_change_notification (void *cls,
260 const void *addr, size_t addrlen)
262 const char *plugin_name = cls;
264 GST_hello_modify_addresses (add_remove, plugin_name, addr, addrlen);
269 * Function that will be called whenever the plugin internally
270 * cleans up a session pointer and hence the service needs to
271 * discard all of those sessions as well. Plugins that do not
272 * use sessions can simply omit calling this function and always
273 * use NULL wherever a session pointer is needed. This function
274 * should be called BEFORE a potential "TransmitContinuation"
275 * from the "TransmitFunction".
278 * @param peer which peer was the session for
279 * @param session which session is being destoyed
282 plugin_env_session_end (void *cls,
283 const struct GNUNET_PeerIdentity *peer,
284 struct Session *session)
286 GST_neighbours_session_terminated (peer, session);
291 * Function called by ATS to notify the callee that the
292 * assigned bandwidth or address for a given peer was changed. If the
293 * callback is called with address/bandwidth assignments of zero, the
294 * ATS disconnect function will still be called once the disconnect
298 * @param peer identity of the peer
299 * @param plugin_name name of the transport plugin, NULL to disconnect
300 * @param session session to use (if available)
301 * @param plugin_addr address to use (if available)
302 * @param plugin_addr_len number of bytes in addr
303 * @param bandwidth assigned outbound bandwidth for the connection
306 ats_request_address_change (void *cls,
307 const struct GNUNET_PeerIdentity *peer,
308 const char *plugin_name,
309 struct Session *session,
310 const void *plugin_addr,
311 size_t plugin_addr_len,
312 struct GNUNET_BANDWIDTH_Value32NBO bandwidth)
314 GST_neighbours_switch_to_address (peer,
317 plugin_addr_len, session, NULL, 0);
318 GST_neighbours_set_incoming_quota (peer, bandwidth);
323 * Function called to notify transport users that another
324 * peer connected to us.
327 * @param peer the peer that connected
328 * @param ats performance data
329 * @param ats_count number of entries in ats (excluding 0-termination)
332 neighbours_connect_notification (void *cls,
333 const struct GNUNET_PeerIdentity *peer,
334 const struct GNUNET_TRANSPORT_ATS_Information
335 *ats, uint32_t ats_count)
337 char buf[sizeof (struct ConnectInfoMessage) +
338 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)];
339 struct ConnectInfoMessage *connect_msg = (struct ConnectInfoMessage *) buf;
340 struct GNUNET_TRANSPORT_ATS_Information *atsm = &connect_msg->ats;
342 connect_msg->header.size = htons (sizeof (buf));
343 connect_msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
344 connect_msg->ats_count = htonl (ats_count);
345 connect_msg->id = *peer;
346 memcpy (&connect_msg->ats, ats,
347 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
348 atsm[ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
349 atsm[ats_count].value = htonl (0);
350 GST_clients_broadcast (&connect_msg->header, GNUNET_NO);
355 * Function called to notify transport users that another
356 * peer disconnected from us.
359 * @param peer the peer that disconnected
362 neighbours_disconnect_notification (void *cls,
363 const struct GNUNET_PeerIdentity *peer)
365 struct DisconnectInfoMessage disconnect_msg;
367 disconnect_msg.header.size = htons (sizeof (struct DisconnectInfoMessage));
368 disconnect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
369 disconnect_msg.reserved = htonl (0);
370 disconnect_msg.peer = *peer;
371 GST_clients_broadcast (&disconnect_msg.header, GNUNET_NO);
376 * Function called when the service shuts down. Unloads our plugins
377 * and cancels pending validations.
379 * @param cls closure, unused
380 * @param tc task context (unused)
383 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
385 GST_validation_stop ();
386 GST_neighbours_stop ();
387 GNUNET_ATS_shutdown (GST_ats);
390 GST_blacklist_stop ();
391 GST_plugins_unload ();
394 if (GST_peerinfo != NULL)
396 GNUNET_PEERINFO_disconnect (GST_peerinfo);
399 if (GST_stats != NULL)
401 GNUNET_STATISTICS_destroy (GST_stats, GNUNET_NO);
404 if (GST_my_private_key != NULL)
406 GNUNET_CRYPTO_rsa_key_free (GST_my_private_key);
407 GST_my_private_key = NULL;
413 * Initiate transport service.
416 * @param server the initialized server
417 * @param c configuration to use
421 struct GNUNET_SERVER_Handle *server,
422 const struct GNUNET_CONFIGURATION_Handle *c)
429 GNUNET_CONFIGURATION_get_value_filename (c,
430 "GNUNETD", "HOSTKEY", &keyfile))
432 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
434 ("Transport service is lacking key configuration settings. Exiting.\n"));
435 GNUNET_SCHEDULER_shutdown ();
438 GST_my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
439 GNUNET_free (keyfile);
440 if (GST_my_private_key == NULL)
442 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
443 _("Transport service could not access hostkey. Exiting.\n"));
444 GNUNET_SCHEDULER_shutdown ();
447 GST_stats = GNUNET_STATISTICS_create ("transport", c);
448 GST_peerinfo = GNUNET_PEERINFO_connect (c);
449 GNUNET_CRYPTO_rsa_key_get_public (GST_my_private_key, &GST_my_public_key);
450 GNUNET_CRYPTO_hash (&GST_my_public_key,
451 sizeof (GST_my_public_key), &GST_my_identity.hashPubKey);
452 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
453 &shutdown_task, NULL);
454 if (GST_peerinfo == NULL)
456 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
457 _("Could not access PEERINFO service. Exiting.\n"));
458 GNUNET_SCHEDULER_shutdown ();
462 /* start subsystems */
463 GST_hello_start (&process_hello_update, NULL);
464 GST_blacklist_start (server);
465 GST_plugins_load (&plugin_env_receive_callback,
466 &plugin_env_address_change_notification,
467 &plugin_env_session_end);
468 GST_ats = GNUNET_ATS_init (GST_cfg, &ats_request_address_change, NULL);
469 GST_neighbours_start (NULL,
470 &neighbours_connect_notification,
471 &neighbours_disconnect_notification);
472 GST_clients_start (server);
473 GST_validation_start ();
478 * The main function for the transport service.
480 * @param argc number of arguments from the command line
481 * @param argv command line arguments
482 * @return 0 ok, 1 on error
485 main (int argc, char *const *argv)
488 GNUNET_SERVICE_run (argc,
491 GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1;
494 /* end of file gnunet-service-transport-new.c */