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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18 Boston, MA 02111-1307, USA.
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_SchedulingHandle *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)
86 * @param transport plugin
88 * @param addrlen address length
91 transmit_our_hello (void *cls, const struct GNUNET_PeerIdentity *target,
92 const struct GNUNET_TRANSPORT_ATS_Information *ats,
94 const char * transport,
98 const struct GNUNET_MessageHeader *hello = cls;
100 GST_neighbours_send (target, (const char *) hello, ntohs (hello->size),
101 GNUNET_CONSTANTS_HELLO_ADDRESS_EXPIRATION, NULL, NULL);
106 * My HELLO has changed. Tell everyone who should know.
109 * @param hello new HELLO
112 process_hello_update (void *cls, const struct GNUNET_MessageHeader *hello)
114 GST_clients_broadcast (hello, GNUNET_NO);
115 GST_neighbours_iterate (&transmit_our_hello, (void *) hello);
120 * Try to initiate a connection to the given peer if the blacklist
123 * @param cls closure (unused, NULL)
124 * @param peer identity of peer that was tested
125 * @param result GNUNET_OK if the connection is allowed,
129 try_connect_if_allowed (void *cls, const struct GNUNET_PeerIdentity *peer,
132 if (GNUNET_OK != result)
133 return; /* not allowed */
134 GST_neighbours_try_connect (peer);
139 * Function called by the transport for each received message.
140 * This function should also be called with "NULL" for the
141 * message to signal that the other peer disconnected.
143 * @param cls closure, const char* with the name of the plugin we received the message from
144 * @param peer (claimed) identity of the other peer
145 * @param message the message, NULL if we only care about
146 * learning about the delay until we should receive again -- FIXME!
147 * @param ats performance information
148 * @param ats_count number of records in ats
149 * @param session identifier used for this session (NULL for plugins
150 * that do not offer bi-directional communication to the sender
151 * using the same "connection")
152 * @param sender_address binary address of the sender (if we established the
153 * connection or are otherwise sure of it; should be NULL
154 * for inbound TCP/UDP connections since it it not clear
155 * that we could establish ourselves a connection to that
156 * IP address and get the same system)
157 * @param sender_address_len number of bytes in sender_address
158 * @return how long the plugin should wait until receiving more data
159 * (plugins that do not support this, can ignore the return value)
161 static struct GNUNET_TIME_Relative
162 plugin_env_receive_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
163 const struct GNUNET_MessageHeader *message,
164 const struct GNUNET_TRANSPORT_ATS_Information *ats,
165 uint32_t ats_count, struct Session *session,
166 const char *sender_address,
167 uint16_t sender_address_len)
169 const char *plugin_name = cls;
171 struct GNUNET_TIME_Relative ret;
174 ret = GNUNET_TIME_UNIT_ZERO;
177 type = ntohs (message->type);
180 case GNUNET_MESSAGE_TYPE_HELLO:
181 GST_validation_handle_hello (message);
183 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
186 "Processing `%s' from `%s'\n", "PING",
187 (sender_address != NULL) ? GST_plugins_a2s (plugin_name,
192 GST_validation_handle_ping (peer, message, plugin_name, session,
193 sender_address, sender_address_len);
195 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
197 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
198 "Processing `%s' from `%s'\n", "PONG",
199 (sender_address != NULL) ? GST_plugins_a2s (plugin_name,
204 GST_validation_handle_pong (peer, message);
206 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT:
207 (void) GST_blacklist_test_allowed (peer, NULL, &try_connect_if_allowed,
209 /* TODO: if 'session != NULL', and timestamp more recent than the
210 * previous one, maybe notify ATS that this is now the preferred
211 * * way to communicate with this peer (other peer switched transport) */
213 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT:
214 /* FIXME: do some validation to prevent an attacker from sending
215 * a fake disconnect message... */
216 GST_neighbours_force_disconnect (peer);
218 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE:
219 GST_neighbours_keepalive (peer);
222 /* should be payload */
223 do_forward = GNUNET_SYSERR;
225 GST_neighbours_calculate_receive_delay (peer,
228 ntohs (message->size),
230 if (do_forward == GNUNET_YES)
232 struct InboundMessage *im;
233 size_t size = sizeof (struct InboundMessage) + ntohs (message->size);
235 im = GNUNET_malloc (size);
236 im->header.size = htons (size);
237 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
238 im->ats_count = htonl (0);
239 memcpy (&(im->peer), peer, sizeof (struct GNUNET_PeerIdentity));
240 memcpy (&im[1], message, ntohs (message->size));
241 GST_clients_broadcast ((const struct GNUNET_MessageHeader *) im,
249 GNUNET_assert ((ats_count > 0) && (ats != NULL));
251 FIXME: this gives an address that might not have been validated to
252 ATS for 'selection', which is probably not what we want; this
253 might be particularly wrong (as in, possibly hiding bugs with address
254 validation) as 'GNUNET_ATS_address_update' currently ignores
255 the expiration given.
257 GNUNET_ATS_address_update (GST_ats, peer, GNUNET_TIME_absolute_get (), /* valid at least until right now... */
258 plugin_name, session, sender_address,
259 sender_address_len, ats, ats_count);
265 * Function that will be called for each address the transport
266 * is aware that it might be reachable under. Update our HELLO.
268 * @param cls name of the plugin (const char*)
269 * @param add_remove should the address added (YES) or removed (NO) from the
270 * set of valid addresses?
271 * @param addr one of the addresses of the host
272 * the specific address format depends on the transport
273 * @param addrlen length of the address
276 plugin_env_address_change_notification (void *cls, int add_remove,
277 const void *addr, size_t addrlen)
279 const char *plugin_name = cls;
281 GST_hello_modify_addresses (add_remove, plugin_name, addr, addrlen);
286 * Function that will be called whenever the plugin internally
287 * cleans up a session pointer and hence the service needs to
288 * discard all of those sessions as well. Plugins that do not
289 * use sessions can simply omit calling this function and always
290 * use NULL wherever a session pointer is needed. This function
291 * should be called BEFORE a potential "TransmitContinuation"
292 * from the "TransmitFunction".
295 * @param peer which peer was the session for
296 * @param session which session is being destoyed
299 plugin_env_session_end (void *cls, const struct GNUNET_PeerIdentity *peer,
300 struct Session *session)
303 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
304 "Session %X to peer `%s' ended \n",
305 session, GNUNET_i2s (peer));
307 GNUNET_ATS_session_destroyed(GST_ats, peer, session);
308 GST_neighbours_session_terminated (peer, session);
313 * Function called by ATS to notify the callee that the
314 * assigned bandwidth or address for a given peer was changed. If the
315 * callback is called with address/bandwidth assignments of zero, the
316 * ATS disconnect function will still be called once the disconnect
320 * @param peer identity of the peer
321 * @param plugin_name name of the transport plugin, NULL to disconnect
322 * @param session session to use (if available)
323 * @param plugin_addr address to use (if available)
324 * @param plugin_addr_len number of bytes in addr
325 * @param bandwidth_out assigned outbound bandwidth for the connection
326 * @param bandwidth_in assigned inbound bandwidth for the connection
329 ats_request_address_change (void *cls, const struct GNUNET_PeerIdentity *peer,
330 const char *plugin_name, struct Session *session,
331 const void *plugin_addr, size_t plugin_addr_len,
332 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
333 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)
335 GST_neighbours_switch_to_address (peer, plugin_name, plugin_addr,
336 plugin_addr_len, session, NULL, 0);
337 GST_neighbours_set_incoming_quota (peer, bandwidth_in);
338 // FIXME: use 'bandwidth_out'!
343 * Function called to notify transport users that another
344 * peer connected to us.
347 * @param peer the peer that connected
348 * @param ats performance data
349 * @param ats_count number of entries in ats (excluding 0-termination)
352 neighbours_connect_notification (void *cls,
353 const struct GNUNET_PeerIdentity *peer,
354 const struct GNUNET_TRANSPORT_ATS_Information
355 *ats, uint32_t ats_count)
357 char buf[sizeof (struct ConnectInfoMessage) +
358 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)];
359 struct ConnectInfoMessage *connect_msg = (struct ConnectInfoMessage *) buf;
360 struct GNUNET_TRANSPORT_ATS_Information *atsm = &connect_msg->ats;
362 connect_msg->header.size = htons (sizeof (buf));
363 connect_msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
364 connect_msg->ats_count = htonl (ats_count);
365 connect_msg->id = *peer;
366 memcpy (&connect_msg->ats, ats,
367 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
368 atsm[ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
369 atsm[ats_count].value = htonl (0);
370 GST_clients_broadcast (&connect_msg->header, GNUNET_NO);
375 * Function called to notify transport users that another
376 * peer disconnected from us.
379 * @param peer the peer that disconnected
382 neighbours_disconnect_notification (void *cls,
383 const struct GNUNET_PeerIdentity *peer)
385 struct DisconnectInfoMessage disconnect_msg;
387 disconnect_msg.header.size = htons (sizeof (struct DisconnectInfoMessage));
388 disconnect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
389 disconnect_msg.reserved = htonl (0);
390 disconnect_msg.peer = *peer;
391 GST_clients_broadcast (&disconnect_msg.header, GNUNET_NO);
396 * Function called when the service shuts down. Unloads our plugins
397 * and cancels pending validations.
399 * @param cls closure, unused
400 * @param tc task context (unused)
403 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
405 GST_validation_stop ();
406 GST_plugins_unload ();
407 GST_neighbours_stop ();
408 GNUNET_ATS_shutdown (GST_ats);
411 GST_blacklist_stop ();
414 if (GST_peerinfo != NULL)
416 GNUNET_PEERINFO_disconnect (GST_peerinfo);
419 if (GST_stats != NULL)
421 GNUNET_STATISTICS_destroy (GST_stats, GNUNET_NO);
424 if (GST_my_private_key != NULL)
426 GNUNET_CRYPTO_rsa_key_free (GST_my_private_key);
427 GST_my_private_key = NULL;
433 * Initiate transport service.
436 * @param server the initialized server
437 * @param c configuration to use
440 run (void *cls, struct GNUNET_SERVER_Handle *server,
441 const struct GNUNET_CONFIGURATION_Handle *c)
448 GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY",
451 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
453 ("Transport service is lacking key configuration settings. Exiting.\n"));
454 GNUNET_SCHEDULER_shutdown ();
457 GST_my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
458 GNUNET_free (keyfile);
459 if (GST_my_private_key == NULL)
461 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
462 _("Transport service could not access hostkey. Exiting.\n"));
463 GNUNET_SCHEDULER_shutdown ();
466 GST_stats = GNUNET_STATISTICS_create ("transport", c);
467 GST_peerinfo = GNUNET_PEERINFO_connect (c);
468 GNUNET_CRYPTO_rsa_key_get_public (GST_my_private_key, &GST_my_public_key);
469 GNUNET_CRYPTO_hash (&GST_my_public_key, sizeof (GST_my_public_key),
470 &GST_my_identity.hashPubKey);
471 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
473 if (GST_peerinfo == NULL)
475 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
476 _("Could not access PEERINFO service. Exiting.\n"));
477 GNUNET_SCHEDULER_shutdown ();
481 /* start subsystems */
482 GST_hello_start (&process_hello_update, NULL);
483 GST_blacklist_start (server);
484 GST_plugins_load (&plugin_env_receive_callback,
485 &plugin_env_address_change_notification,
486 &plugin_env_session_end);
487 GST_ats = GNUNET_ATS_init (GST_cfg, &ats_request_address_change, NULL);
488 GST_neighbours_start (NULL, &neighbours_connect_notification,
489 &neighbours_disconnect_notification);
490 GST_clients_start (server);
491 GST_validation_start ();
496 * The main function for the transport service.
498 * @param argc number of arguments from the command line
499 * @param argv command line arguments
500 * @return 0 ok, 1 on error
503 main (int argc, char *const *argv)
506 GNUNET_SERVICE_run (argc, argv, "transport",
507 GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1;
510 /* end of file gnunet-service-transport-new.c */