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/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_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 * We received some payload. Prepare to pass it on to our clients.
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 * @return how long the plugin should wait until receiving more data
148 static struct GNUNET_TIME_Relative
149 process_payload (const struct GNUNET_PeerIdentity *peer,
150 const struct GNUNET_MessageHeader *message,
151 const struct GNUNET_ATS_Information *ats,
154 struct GNUNET_TIME_Relative ret;
156 struct InboundMessage *im;
157 size_t size = sizeof (struct InboundMessage) + ntohs (message->size);
160 ret = GNUNET_TIME_UNIT_ZERO;
161 do_forward = GNUNET_SYSERR;
163 GST_neighbours_calculate_receive_delay (peer,
166 ntohs (message->size),
168 im = (struct InboundMessage*) buf;
169 im->header.size = htons (size);
170 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
171 im->ats_count = htonl (0);
172 memcpy (&(im->peer), peer, sizeof (struct GNUNET_PeerIdentity));
173 memcpy (&im[1], message, ntohs (message->size));
178 GST_clients_broadcast (&im->header, GNUNET_YES);
181 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
182 _("Discarded %u bytes of type %u from %s: quota violated!\n"),
183 ntohs (message->size),
184 ntohs (message->type),
188 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
189 _("Discarded %u bytes of type %u from %s: connection is down!\n"),
190 ntohs (message->size),
191 ntohs (message->type),
193 /* FIXME: store until connection is up? This is virtually always a SETKEY and a PING... */
204 * Function called by the transport for each received message.
205 * This function should also be called with "NULL" for the
206 * message to signal that the other peer disconnected.
208 * @param cls closure, const char* with the name of the plugin we received the message from
209 * @param peer (claimed) identity of the other peer
210 * @param message the message, NULL if we only care about
211 * learning about the delay until we should receive again -- FIXME!
212 * @param ats performance information
213 * @param ats_count number of records in ats
214 * @param session identifier used for this session (NULL for plugins
215 * that do not offer bi-directional communication to the sender
216 * using the same "connection")
217 * @param sender_address binary address of the sender (if we established the
218 * connection or are otherwise sure of it; should be NULL
219 * for inbound TCP/UDP connections since it it not clear
220 * that we could establish ourselves a connection to that
221 * IP address and get the same system)
222 * @param sender_address_len number of bytes in sender_address
223 * @return how long the plugin should wait until receiving more data
224 * (plugins that do not support this, can ignore the return value)
226 static struct GNUNET_TIME_Relative
227 plugin_env_receive_callback (void *cls, const struct GNUNET_PeerIdentity *peer,
228 const struct GNUNET_MessageHeader *message,
229 const struct GNUNET_ATS_Information *ats,
230 uint32_t ats_count, struct Session *session,
231 const char *sender_address,
232 uint16_t sender_address_len)
234 const char *plugin_name = cls;
235 struct GNUNET_TIME_Relative ret;
238 ret = GNUNET_TIME_UNIT_ZERO;
241 type = ntohs (message->type);
244 case GNUNET_MESSAGE_TYPE_HELLO:
245 GST_validation_handle_hello (message);
247 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
249 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
250 "Processing `%s' from `%s'\n", "PING",
251 (sender_address != NULL) ? GST_plugins_a2s (plugin_name,
256 GST_validation_handle_ping (peer, message, plugin_name, session,
257 sender_address, sender_address_len);
259 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
262 "Processing `%s' from `%s'\n", "PONG",
263 (sender_address != NULL) ? GST_plugins_a2s (plugin_name,
268 GST_validation_handle_pong (peer, message);
270 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_CONNECT:
271 GST_neighbours_handle_connect (message,
273 plugin_name, sender_address, sender_address_len,
274 session, ats, ats_count);
275 (void) GST_blacklist_test_allowed (peer, NULL, &try_connect_if_allowed,
278 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT:
279 /* FIXME: do some validation to prevent an attacker from sending
280 * a fake disconnect message... */
281 GST_neighbours_force_disconnect (peer);
283 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE:
284 GST_neighbours_keepalive (peer);
287 /* should be payload */
288 ret = process_payload (peer,
295 /* FIXME: this should not be needed, and not sure it's good to have it, but without
296 this connections seem to go extra-slow */
297 if ((ats_count > 0) && (ats != NULL))
300 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
302 "Giving ATS session %p of plugin %s for peer %s\n",
306 GNUNET_ATS_address_update (GST_ats, peer,
307 plugin_name, sender_address, sender_address_len,
313 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
314 "Allowing receive from peer %s to continue in %llu ms\n",
316 (unsigned long long) ret.rel_value);
323 * Function that will be called for each address the transport
324 * is aware that it might be reachable under. Update our HELLO.
326 * @param cls name of the plugin (const char*)
327 * @param add_remove should the address added (YES) or removed (NO) from the
328 * set of valid addresses?
329 * @param addr one of the addresses of the host
330 * the specific address format depends on the transport
331 * @param addrlen length of the address
334 plugin_env_address_change_notification (void *cls, int add_remove,
335 const void *addr, size_t addrlen)
337 const char *plugin_name = cls;
339 GST_hello_modify_addresses (add_remove, plugin_name, addr, addrlen);
344 * Function that will be called whenever the plugin internally
345 * cleans up a session pointer and hence the service needs to
346 * discard all of those sessions as well. Plugins that do not
347 * use sessions can simply omit calling this function and always
348 * use NULL wherever a session pointer is needed. This function
349 * should be called BEFORE a potential "TransmitContinuation"
350 * from the "TransmitFunction".
353 * @param peer which peer was the session for
354 * @param session which session is being destoyed
357 plugin_env_session_end (void *cls, const struct GNUNET_PeerIdentity *peer,
358 struct Session *session)
361 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
362 "Session %X to peer `%s' ended \n",
363 session, GNUNET_i2s (peer));
366 GNUNET_log_from (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
368 "Telling ATS to destroy session %p from peer %s\n",
371 GNUNET_ATS_address_destroyed(GST_ats, peer, NULL, NULL, 0, session);
372 GST_neighbours_session_terminated (peer, session);
377 * Function called by ATS to notify the callee that the
378 * assigned bandwidth or address for a given peer was changed. If the
379 * callback is called with address/bandwidth assignments of zero, the
380 * ATS disconnect function will still be called once the disconnect
384 * @param peer identity of the peer
385 * @param plugin_name name of the transport plugin, NULL to disconnect
386 * @param session session to use (if available)
387 * @param plugin_addr address to use (if available)
388 * @param plugin_addr_len number of bytes in addr
389 * @param bandwidth_out assigned outbound bandwidth for the connection, 0 to disconnect from peer
390 * @param bandwidth_in assigned inbound bandwidth for the connection, 0 to disconnect from peer
393 ats_request_address_change (void *cls, const struct GNUNET_PeerIdentity *peer,
394 const char *plugin_name,
395 const void *plugin_addr, size_t plugin_addr_len,
396 struct Session *session,
397 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
398 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
399 const struct GNUNET_ATS_Information * ats,
402 uint32_t bw_in = ntohl (bandwidth_in.value__);
403 uint32_t bw_out = ntohl (bandwidth_out.value__);
404 struct QuotaSetMessage msg;
406 /* ATS tells me to disconnect from peer*/
407 if ((bw_in == 0) && (bw_out == 0))
409 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "ATS tells me to disconnect from peer `%s'\n",
411 GST_neighbours_force_disconnect(peer);
415 GST_neighbours_switch_to_address (peer, plugin_name, plugin_addr,
416 plugin_addr_len, session, ats, ats_count);
418 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
419 "Sending outbound quota of %u Bps for peer `%s' to all clients\n",
420 ntohl (bandwidth_out.value__), GNUNET_i2s (peer));
422 msg.header.size = htons (sizeof (struct QuotaSetMessage));
423 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
424 msg.quota = bandwidth_out;
426 GST_clients_broadcast (&msg.header, GNUNET_NO);
429 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
430 "Setting inbound quota of %u for peer `%s' to \n",
431 ntohl (bandwidth_in.value__), GNUNET_i2s (peer));
433 GST_neighbours_set_incoming_quota (peer, bandwidth_in);
438 * Function called to notify transport users that another
439 * peer connected to us.
442 * @param peer the peer that connected
443 * @param ats performance data
444 * @param ats_count number of entries in ats
447 neighbours_connect_notification (void *cls,
448 const struct GNUNET_PeerIdentity *peer,
449 const struct GNUNET_ATS_Information
450 *ats, uint32_t ats_count)
452 char buf[sizeof (struct ConnectInfoMessage) +
453 ats_count * sizeof (struct GNUNET_ATS_Information)];
454 struct ConnectInfoMessage *connect_msg = (struct ConnectInfoMessage *) buf;
456 connect_msg->header.size = htons (sizeof (buf));
457 connect_msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
458 connect_msg->ats_count = htonl (ats_count);
459 connect_msg->id = *peer;
460 memcpy (&connect_msg->ats, &connect_msg->ats,
461 ats_count * sizeof (struct GNUNET_ATS_Information));
462 GST_clients_broadcast (&connect_msg->header, GNUNET_NO);
467 * Function called to notify transport users that another
468 * peer disconnected from us.
471 * @param peer the peer that disconnected
474 neighbours_disconnect_notification (void *cls,
475 const struct GNUNET_PeerIdentity *peer)
477 struct DisconnectInfoMessage disconnect_msg;
479 disconnect_msg.header.size = htons (sizeof (struct DisconnectInfoMessage));
480 disconnect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
481 disconnect_msg.reserved = htonl (0);
482 disconnect_msg.peer = *peer;
483 GST_clients_broadcast (&disconnect_msg.header, GNUNET_NO);
488 * Function called when the service shuts down. Unloads our plugins
489 * and cancels pending validations.
491 * @param cls closure, unused
492 * @param tc task context (unused)
495 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
497 GST_validation_stop ();
498 GST_plugins_unload ();
499 GST_neighbours_stop ();
500 GNUNET_ATS_scheduling_done (GST_ats);
503 GST_blacklist_stop ();
506 if (GST_peerinfo != NULL)
508 GNUNET_PEERINFO_disconnect (GST_peerinfo);
511 if (GST_stats != NULL)
513 GNUNET_STATISTICS_destroy (GST_stats, GNUNET_NO);
516 if (GST_my_private_key != NULL)
518 GNUNET_CRYPTO_rsa_key_free (GST_my_private_key);
519 GST_my_private_key = NULL;
525 * Initiate transport service.
528 * @param server the initialized server
529 * @param c configuration to use
532 run (void *cls, struct GNUNET_SERVER_Handle *server,
533 const struct GNUNET_CONFIGURATION_Handle *c)
540 GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY",
543 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
545 ("Transport service is lacking key configuration settings. Exiting.\n"));
546 GNUNET_SCHEDULER_shutdown ();
549 GST_my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
550 GNUNET_free (keyfile);
551 if (GST_my_private_key == NULL)
553 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
554 _("Transport service could not access hostkey. Exiting.\n"));
555 GNUNET_SCHEDULER_shutdown ();
558 GST_stats = GNUNET_STATISTICS_create ("transport", c);
559 GST_peerinfo = GNUNET_PEERINFO_connect (c);
560 GNUNET_CRYPTO_rsa_key_get_public (GST_my_private_key, &GST_my_public_key);
561 GNUNET_CRYPTO_hash (&GST_my_public_key, sizeof (GST_my_public_key),
562 &GST_my_identity.hashPubKey);
563 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
565 if (GST_peerinfo == NULL)
567 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
568 _("Could not access PEERINFO service. Exiting.\n"));
569 GNUNET_SCHEDULER_shutdown ();
573 /* start subsystems */
574 GST_hello_start (&process_hello_update, NULL);
575 GST_blacklist_start (server);
576 GST_plugins_load (&plugin_env_receive_callback,
577 &plugin_env_address_change_notification,
578 &plugin_env_session_end);
579 GST_ats = GNUNET_ATS_scheduling_init (GST_cfg, &ats_request_address_change, NULL);
580 GST_neighbours_start (NULL, &neighbours_connect_notification,
581 &neighbours_disconnect_notification);
582 GST_clients_start (server);
583 GST_validation_start ();
588 * The main function for the transport service.
590 * @param argc number of arguments from the command line
591 * @param argv command line arguments
592 * @return 0 ok, 1 on error
595 main (int argc, char *const *argv)
598 GNUNET_SERVICE_run (argc, argv, "transport",
599 GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1;
602 /* end of file gnunet-service-transport-new.c */