2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
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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/gnunet-service-transport.c
23 * @brief low-level P2P messaging
24 * @author Christian Grothoff
27 * - bi-directional nature of TCP is not exploited
28 * - re-validation is broken (triggered only on successful validation,
29 * does not consider expiration times)
33 * - This code uses 'GNUNET_a2s' for debug printing in many places,
34 * which is technically wrong since it assumes we have IP+Port
35 * (v4/v6) addresses. Once we add transports like http or smtp
36 * this will have to be changed!
39 #include "gnunet_client_lib.h"
40 #include "gnunet_container_lib.h"
41 #include "gnunet_constants.h"
42 #include "gnunet_getopt_lib.h"
43 #include "gnunet_hello_lib.h"
44 #include "gnunet_os_lib.h"
45 #include "gnunet_peerinfo_service.h"
46 #include "gnunet_plugin_lib.h"
47 #include "gnunet_protocols.h"
48 #include "gnunet_service_lib.h"
49 #include "gnunet_signatures.h"
50 #include "plugin_transport.h"
51 #include "transport.h"
54 * Should we do some additional checks (to validate behavior
57 #define EXTRA_CHECKS GNUNET_YES
60 * How many messages can we have pending for a given client process
61 * before we start to drop incoming messages? We typically should
62 * have only one client and so this would be the primary buffer for
63 * messages, so the number should be chosen rather generously.
65 * The expectation here is that most of the time the queue is large
66 * enough so that a drop is virtually never required.
68 #define MAX_PENDING 128
71 * How often should we try to reconnect to a peer using a particular
72 * transport plugin before giving up? Note that the plugin may be
73 * added back to the list after PLUGIN_RETRY_FREQUENCY expires.
75 #define MAX_CONNECT_RETRY 3
78 * Limit on the number of ready-to-run tasks when validating
79 * HELLOs. If more tasks are ready to run, we will drop
80 * HELLOs instead of validating them.
82 #define MAX_HELLO_LOAD 4
85 * How often must a peer violate bandwidth quotas before we start
86 * to simply drop its messages?
88 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
91 * How long until a HELLO verification attempt should time out?
92 * Must be rather small, otherwise a partially successful HELLO
93 * validation (some addresses working) might not be available
94 * before a client's request for a connection fails for good.
95 * Besides, if a single request to an address takes a long time,
96 * then the peer is unlikely worthwhile anyway.
98 #define HELLO_VERIFICATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
101 * How long will we allow sending of a ping to be delayed?
103 #define TRANSPORT_DEFAULT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
106 * How often will we re-validate for latency information
108 #define TRANSPORT_DEFAULT_REVALIDATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
111 * Priority to use for PONG messages.
113 #define TRANSPORT_PONG_PRIORITY 4
116 * How often do we re-add (cheaper) plugins to our list of plugins
117 * to try for a given connected peer?
119 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
122 * After how long do we expire an address in a HELLO that we just
123 * validated? This value is also used for our own addresses when we
126 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
130 * How long before an existing address expires should we again try to
131 * validate it? Must be (significantly) smaller than
132 * HELLO_ADDRESS_EXPIRATION.
134 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
138 * List of addresses of other peers
140 struct ForeignAddressList
143 * This is a linked list.
145 struct ForeignAddressList *next;
148 * Which ready list does this entry belong to.
150 struct ReadyList *ready_list;
153 * How long until we auto-expire this address (unless it is
154 * re-confirmed by the transport)?
156 struct GNUNET_TIME_Absolute expires;
159 * Task used to re-validate addresses, updates latencies and
162 GNUNET_SCHEDULER_TaskIdentifier revalidate_task;
175 * What was the last latency observed for this plugin
176 * and peer? Invalid if connected is GNUNET_NO.
178 struct GNUNET_TIME_Relative latency;
181 * If we did not successfully transmit a message to the given peer
182 * via this connection during the specified time, we should consider
183 * the connection to be dead. This is used in the case that a TCP
184 * transport simply stalls writing to the stream but does not
185 * formerly get a signal that the other peer died.
187 struct GNUNET_TIME_Absolute timeout;
190 * Are we currently connected via this address? The first time we
191 * successfully transmit or receive data to a peer via a particular
192 * address, we set this to GNUNET_YES. If we later get an error
193 * (disconnect notification, transmission failure, timeout), we set
194 * it back to GNUNET_NO.
199 * Is this plugin currently busy transmitting to the specific target?
200 * GNUNET_NO if not (initial, default state is GNUNET_NO). Internal
201 * messages do not count as 'in transmit'.
206 * Has this address been validated yet?
211 * How often have we tried to connect using this plugin? Used to
212 * discriminate against addresses that do not work well.
213 * FIXME: not yet used, but should be!
215 unsigned int connect_attempts;
218 * DV distance to this peer (1 if no DV is used).
219 * FIXME: need to set this from transport plugins!
227 * Entry in linked list of network addresses for ourselves.
229 struct OwnAddressList
232 * This is a linked list.
234 struct OwnAddressList *next;
237 * The address, actually a pointer to the end
238 * of this struct. Do not free!
243 * How long until we auto-expire this address (unless it is
244 * re-confirmed by the transport)?
246 struct GNUNET_TIME_Absolute expires;
257 * Entry in linked list of all of our plugins.
259 struct TransportPlugin
263 * This is a linked list.
265 struct TransportPlugin *next;
268 * API of the transport as returned by the plugin's
269 * initialization function.
271 struct GNUNET_TRANSPORT_PluginFunctions *api;
274 * Short name for the plugin (i.e. "tcp").
279 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
284 * List of our known addresses for this transport.
286 struct OwnAddressList *addresses;
289 * Environment this transport service is using
292 struct GNUNET_TRANSPORT_PluginEnvironment env;
295 * ID of task that is used to clean up expired addresses.
297 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
300 * Set to GNUNET_YES if we need to scrap the existing
301 * list of "addresses" and start fresh when we receive
302 * the next address update from a transport. Set to
303 * GNUNET_NO if we should just add the new address
304 * to the list and wait for the commit call.
310 struct NeighbourList;
313 * For each neighbour we keep a list of messages
314 * that we still want to transmit to the neighbour.
320 * This is a doubly linked list.
322 struct MessageQueue *next;
325 * This is a doubly linked list.
327 struct MessageQueue *prev;
330 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
331 * stuck together in memory. Allocated at the end of this struct.
333 const char *message_buf;
336 * Size of the message buf
338 size_t message_buf_size;
341 * Client responsible for queueing the message;
342 * used to check that a client has no two messages
343 * pending for the same target. Can be NULL.
345 struct TransportClient *client;
348 * Using which specific address should we send this message?
350 struct ForeignAddressList *specific_address;
353 * Peer ID of the Neighbour this entry belongs to.
355 struct GNUNET_PeerIdentity neighbour_id;
358 * Plugin that we used for the transmission.
359 * NULL until we scheduled a transmission.
361 struct TransportPlugin *plugin;
364 * At what time should we fail?
366 struct GNUNET_TIME_Absolute timeout;
369 * Internal message of the transport system that should not be
370 * included in the usual SEND-SEND_OK transmission confirmation
371 * traffic management scheme. Typically, "internal_msg" will
372 * be set whenever "client" is NULL (but it is not strictly
378 * How important is the message?
380 unsigned int priority;
386 * For a given Neighbour, which plugins are available
387 * to talk to this peer and what are their costs?
392 * This is a linked list.
394 struct ReadyList *next;
397 * Which of our transport plugins does this entry
400 struct TransportPlugin *plugin;
403 * Transport addresses, latency, and readiness for
404 * this particular plugin.
406 struct ForeignAddressList *addresses;
412 * Entry in linked list of all of our current neighbours.
418 * This is a linked list.
420 struct NeighbourList *next;
423 * Which of our transports is connected to this peer
424 * and what is their status?
426 struct ReadyList *plugins;
429 * Head of list of messages we would like to send to this peer;
430 * must contain at most one message per client.
432 struct MessageQueue *messages_head;
435 * Tail of list of messages we would like to send to this peer; must
436 * contain at most one message per client.
438 struct MessageQueue *messages_tail;
441 * Identity of this neighbour.
443 struct GNUNET_PeerIdentity id;
446 * ID of task scheduled to run when this peer is about to
447 * time out (will free resources associated with the peer).
449 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
452 * ID of task scheduled to run when we should retry transmitting
453 * the head of the message queue. Actually triggered when the
454 * transmission is timing out (we trigger instantly when we have
455 * a chance of success).
457 GNUNET_SCHEDULER_TaskIdentifier retry_task;
460 * How long until we should consider this peer dead
461 * (if we don't receive another message in the
464 struct GNUNET_TIME_Absolute peer_timeout;
467 * Tracker for inbound bandwidth.
469 struct GNUNET_BANDWIDTH_Tracker in_tracker;
472 * The latency we have seen for this particular address for
473 * this particular peer. This latency may have been calculated
474 * over multiple transports. This value reflects how long it took
475 * us to receive a response when SENDING via this particular
476 * transport/neighbour/address combination!
478 * FIXME: we need to periodically send PINGs to update this
479 * latency (at least more often than the current "huge" (11h?)
482 struct GNUNET_TIME_Relative latency;
485 * How often has the other peer (recently) violated the
486 * inbound traffic limit? Incremented by 10 per violation,
487 * decremented by 1 per non-violation (for each
490 unsigned int quota_violation_count;
493 * DV distance to this peer (1 if no DV is used).
498 * Have we seen an PONG from this neighbour in the past (and
499 * not had a disconnect since)?
506 * Message used to ask a peer to validate receipt (to check an address
509 struct TransportPingMessage
513 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
515 struct GNUNET_MessageHeader header;
518 * Random challenge number (in network byte order).
520 uint32_t challenge GNUNET_PACKED;
523 * Who is the intended recipient?
525 struct GNUNET_PeerIdentity target;
531 * Message used to validate a HELLO. The challenge is included in the
532 * confirmation to make matching of replies to requests possible. The
533 * signature signs the original challenge number, our public key, the
534 * sender's address (so that the sender can check that the address we
535 * saw is plausible for him and possibly detect a MiM attack) and a
536 * timestamp (to limit replay).<p>
538 * This message is followed by the address of the
539 * client that we are observing (which is part of what
542 struct TransportPongMessage
546 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
548 struct GNUNET_MessageHeader header;
551 * For padding, always zero.
553 uint32_t reserved GNUNET_PACKED;
558 struct GNUNET_CRYPTO_RsaSignature signature;
561 * What are we signing and why?
563 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
566 * Random challenge number (in network byte order).
568 uint32_t challenge GNUNET_PACKED;
571 * Who signed this message?
573 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded signer;
576 * Size of address appended to this message
584 * Linked list of messages to be transmitted to the client. Each
585 * entry is followed by the actual message.
587 struct ClientMessageQueueEntry
590 * This is a doubly-linked list.
592 struct ClientMessageQueueEntry *next;
595 * This is a doubly-linked list.
597 struct ClientMessageQueueEntry *prev;
602 * Client connected to the transport service.
604 struct TransportClient
608 * This is a linked list.
610 struct TransportClient *next;
613 * Handle to the client.
615 struct GNUNET_SERVER_Client *client;
618 * Linked list of messages yet to be transmitted to
621 struct ClientMessageQueueEntry *message_queue_head;
624 * Tail of linked list of messages yet to be transmitted to the
627 struct ClientMessageQueueEntry *message_queue_tail;
630 * Current transmit request handle.
632 struct GNUNET_CONNECTION_TransmitHandle *th;
635 * Is a call to "transmit_send_continuation" pending? If so, we
636 * must not free this struct (even if the corresponding client
637 * disconnects) and instead only remove it from the linked list and
638 * set the "client" field to NULL.
643 * Length of the list of messages pending for this client.
645 unsigned int message_count;
651 * Entry in map of all HELLOs awaiting validation.
653 struct ValidationEntry
657 * The address, actually a pointer to the end
658 * of this struct. Do not free!
663 * Name of the transport.
665 char *transport_name;
668 * The public key of the peer.
670 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
673 * ID of task that will clean up this entry if we don't succeed
674 * with the validation first.
676 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
679 * At what time did we send this validation?
681 struct GNUNET_TIME_Absolute send_time;
689 * Challenge number we used.
697 * Context of currently active requests to peerinfo
698 * for validation of HELLOs.
700 struct CheckHelloValidatedContext
704 * This is a doubly-linked list.
706 struct CheckHelloValidatedContext *next;
709 * This is a doubly-linked list.
711 struct CheckHelloValidatedContext *prev;
714 * Hello that we are validating.
716 const struct GNUNET_HELLO_Message *hello;
719 * Context for peerinfo iteration.
720 * NULL after we are done processing peerinfo's information.
722 struct GNUNET_PEERINFO_IteratorContext *piter;
725 * Was a HELLO known for this peer to peerinfo?
732 * Struct for keeping information about addresses to validate
733 * so that we can re-use for sending around ping's and receiving
734 * pongs periodically to keep connections alive and also better
735 * estimate latency of connections.
738 struct PeriodicValidationContext
742 * The address we are keeping alive
744 struct ForeignAddressList *foreign_address;
747 * The name of the transport
752 * Public Key of the peer to re-validate
754 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
761 static struct GNUNET_HELLO_Message *our_hello;
764 * "version" of "our_hello". Used to see if a given neighbour has
765 * already been sent the latest version of our HELLO message.
767 static unsigned int our_hello_version;
772 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
777 static struct GNUNET_PeerIdentity my_identity;
782 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
787 struct GNUNET_SCHEDULER_Handle *sched;
792 const struct GNUNET_CONFIGURATION_Handle *cfg;
795 * Linked list of all clients to this service.
797 static struct TransportClient *clients;
800 * All loaded plugins.
802 static struct TransportPlugin *plugins;
807 static struct GNUNET_SERVER_Handle *server;
810 * All known neighbours and their HELLOs.
812 static struct NeighbourList *neighbours;
815 * Number of neighbours we'd like to have.
817 static uint32_t max_connect_per_transport;
820 * Head of linked list.
822 static struct CheckHelloValidatedContext *chvc_head;
825 * Tail of linked list.
827 static struct CheckHelloValidatedContext *chvc_tail;
830 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
831 * of the given peer that we are currently validating).
833 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
836 * Handle for reporting statistics.
838 static struct GNUNET_STATISTICS_Handle *stats;
842 * The peer specified by the given neighbour has timed-out or a plugin
843 * has disconnected. We may either need to do nothing (other plugins
844 * still up), or trigger a full disconnect and clean up. This
845 * function updates our state and do the necessary notifications.
846 * Also notifies our clients that the neighbour is now officially
849 * @param n the neighbour list entry for the peer
850 * @param check should we just check if all plugins
851 * disconnected or must we ask all plugins to
854 static void disconnect_neighbour (struct NeighbourList *n, int check);
857 * Check the ready list for the given neighbour and if a plugin is
858 * ready for transmission (and if we have a message), do so!
860 * @param neighbour target peer for which to transmit
862 static void try_transmission_to_peer (struct NeighbourList *neighbour);
866 * Find an entry in the neighbour list for a particular peer.
867 * if sender_address is not specified (NULL) then return the
868 * first matching entry. If sender_address is specified, then
869 * make sure that the address and address_len also matches.
871 * FIXME: This description does not fit the function.
873 * @return NULL if not found.
875 static struct NeighbourList *
876 find_neighbour (const struct GNUNET_PeerIdentity *key)
878 struct NeighbourList *head = neighbours;
880 while ((head != NULL) &&
881 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
888 * Find an entry in the transport list for a particular transport.
890 * @return NULL if not found.
892 static struct TransportPlugin *
893 find_transport (const char *short_name)
895 struct TransportPlugin *head = plugins;
896 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
903 * Function called to notify a client about the socket being ready to
904 * queue more data. "buf" will be NULL and "size" zero if the socket
905 * was closed for writing in the meantime.
908 * @param size number of bytes available in buf
909 * @param buf where the callee should write the message
910 * @return number of bytes written to buf
913 transmit_to_client_callback (void *cls, size_t size, void *buf)
915 struct TransportClient *client = cls;
916 struct ClientMessageQueueEntry *q;
919 const struct GNUNET_MessageHeader *msg;
925 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
926 "Transmission to client failed, closing connection.\n");
927 /* fatal error with client, free message queue! */
928 while (NULL != (q = client->message_queue_head))
930 GNUNET_STATISTICS_update (stats,
931 gettext_noop ("# bytes discarded (could not transmit to client)"),
932 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
934 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
935 client->message_queue_tail,
939 client->message_count = 0;
944 while (NULL != (q = client->message_queue_head))
946 msg = (const struct GNUNET_MessageHeader *) &q[1];
947 msize = ntohs (msg->size);
948 if (msize + tsize > size)
951 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
952 "Transmitting message of type %u to client.\n",
955 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
956 client->message_queue_tail,
958 memcpy (&cbuf[tsize], msg, msize);
961 client->message_count--;
965 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
966 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
968 GNUNET_TIME_UNIT_FOREVER_REL,
969 &transmit_to_client_callback,
971 GNUNET_assert (client->th != NULL);
978 * Send the specified message to the specified client. Since multiple
979 * messages may be pending for the same client at a time, this code
980 * makes sure that no message is lost.
982 * @param client client to transmit the message to
983 * @param msg the message to send
984 * @param may_drop can this message be dropped if the
985 * message queue for this client is getting far too large?
988 transmit_to_client (struct TransportClient *client,
989 const struct GNUNET_MessageHeader *msg, int may_drop)
991 struct ClientMessageQueueEntry *q;
994 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
996 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
998 ("Dropping message, have %u messages pending (%u is the soft limit)\n"),
999 client->message_count, MAX_PENDING);
1000 /* TODO: call to statistics... */
1003 msize = ntohs (msg->size);
1004 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1005 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1006 memcpy (&q[1], msg, msize);
1007 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1008 client->message_queue_tail,
1009 client->message_queue_tail,
1011 client->message_count++;
1012 if (client->th == NULL)
1014 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1016 GNUNET_TIME_UNIT_FOREVER_REL,
1017 &transmit_to_client_callback,
1019 GNUNET_assert (client->th != NULL);
1025 * Transmit a 'SEND_OK' notification to the given client for the
1028 * @param client who to notify
1029 * @param n neighbour to notify about
1030 * @param result status code for the transmission request
1033 transmit_send_ok (struct TransportClient *client,
1034 struct NeighbourList *n,
1037 struct SendOkMessage send_ok_msg;
1039 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1040 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1041 send_ok_msg.success = htonl (result);
1042 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1043 send_ok_msg.peer = n->id;
1044 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1049 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1050 * upon "completion" of a send request. This tells the API
1051 * that it is now legal to send another message to the given
1054 * @param cls closure, identifies the entry on the
1055 * message queue that was transmitted and the
1056 * client responsible for queueing the message
1057 * @param target the peer receiving the message
1058 * @param result GNUNET_OK on success, if the transmission
1059 * failed, we should not tell the client to transmit
1063 transmit_send_continuation (void *cls,
1064 const struct GNUNET_PeerIdentity *target,
1067 struct MessageQueue *mq = cls;
1068 struct NeighbourList *n;
1070 if (result == GNUNET_OK)
1072 GNUNET_STATISTICS_update (stats,
1073 gettext_noop ("# bytes successfully transmitted by plugins"),
1074 mq->message_buf_size,
1079 GNUNET_STATISTICS_update (stats,
1080 gettext_noop ("# bytes with transmission failure by plugins"),
1081 mq->message_buf_size,
1084 n = find_neighbour(&mq->neighbour_id);
1085 GNUNET_assert (n != NULL);
1086 if (mq->specific_address != NULL)
1088 if (result == GNUNET_OK)
1090 mq->specific_address->timeout =
1091 GNUNET_TIME_relative_to_absolute
1092 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1093 if (mq->specific_address->connected != GNUNET_YES)
1095 GNUNET_STATISTICS_update (stats,
1096 gettext_noop ("# connected addresses"),
1099 mq->specific_address->connected = GNUNET_YES;
1104 if (mq->specific_address->connected != GNUNET_NO)
1106 GNUNET_STATISTICS_update (stats,
1107 gettext_noop ("# connected addresses"),
1110 mq->specific_address->connected = GNUNET_NO;
1113 if (! mq->internal_msg)
1114 mq->specific_address->in_transmit = GNUNET_NO;
1116 if (mq->client != NULL)
1117 transmit_send_ok (mq->client, n, result);
1119 try_transmission_to_peer (n);
1124 * Find an address in any of the available transports for
1125 * the given neighbour that would be good for message
1126 * transmission. This is essentially the transport selection
1129 * @param neighbour for whom to select an address
1130 * @return selected address, NULL if we have none
1132 struct ForeignAddressList *
1133 find_ready_address(struct NeighbourList *neighbour)
1135 struct ReadyList *head = neighbour->plugins;
1136 struct ForeignAddressList *addresses;
1137 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1138 struct ForeignAddressList *best_address;
1140 best_address = NULL;
1141 while (head != NULL)
1143 addresses = head->addresses;
1144 while (addresses != NULL)
1146 if ( (addresses->timeout.value < now.value) &&
1147 (addresses->connected == GNUNET_YES) )
1150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1151 "Marking long-time inactive connection to `%4s' as down.\n",
1152 GNUNET_i2s (&neighbour->id));
1154 GNUNET_STATISTICS_update (stats,
1155 gettext_noop ("# connected addresses"),
1158 addresses->connected = GNUNET_NO;
1160 addresses = addresses->next;
1163 addresses = head->addresses;
1164 while (addresses != NULL)
1166 if ( ( (best_address == NULL) ||
1167 (addresses->connected == GNUNET_YES) ||
1168 (best_address->connected == GNUNET_NO) ) &&
1169 (addresses->in_transmit == GNUNET_NO) &&
1170 ( (best_address == NULL) ||
1171 (addresses->latency.value < best_address->latency.value)) )
1172 best_address = addresses;
1173 /* FIXME: also give lower-latency addresses that are not
1174 connected a chance some times... */
1175 addresses = addresses->next;
1179 if (best_address != NULL)
1182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1183 "Best address found has latency of %llu ms.\n",
1184 best_address->latency.value);
1189 GNUNET_STATISTICS_update (stats,
1190 gettext_noop ("# transmission attempts failed (no address)"),
1194 return best_address;
1200 * We should re-try transmitting to the given peer,
1201 * hopefully we've learned something in the meantime.
1204 retry_transmission_task (void *cls,
1205 const struct GNUNET_SCHEDULER_TaskContext *tc)
1207 struct NeighbourList *n = cls;
1209 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1210 try_transmission_to_peer (n);
1215 * Check the ready list for the given neighbour and if a plugin is
1216 * ready for transmission (and if we have a message), do so!
1218 * @param neighbour target peer for which to transmit
1221 try_transmission_to_peer (struct NeighbourList *neighbour)
1223 struct ReadyList *rl;
1224 struct MessageQueue *mq;
1225 struct GNUNET_TIME_Relative timeout;
1227 if (neighbour->messages_head == NULL)
1228 return; /* nothing to do */
1230 mq = neighbour->messages_head;
1231 /* FIXME: support bi-directional use of TCP */
1232 if (mq->specific_address == NULL)
1233 mq->specific_address = find_ready_address(neighbour);
1234 if (mq->specific_address == NULL)
1236 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1237 if (timeout.value == 0)
1240 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1241 "No destination address available to transmit message of size %u to peer `%4s'\n",
1242 mq->message_buf_size,
1243 GNUNET_i2s (&mq->neighbour_id));
1245 GNUNET_STATISTICS_update (stats,
1246 gettext_noop ("# bytes in message queue for other peers"),
1247 -mq->message_buf_size,
1249 GNUNET_STATISTICS_update (stats,
1250 gettext_noop ("# bytes discarded (no destination address available)"),
1251 mq->message_buf_size,
1253 if (mq->client != NULL)
1254 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1255 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1256 neighbour->messages_tail,
1259 return; /* nobody ready */
1261 GNUNET_STATISTICS_update (stats,
1262 gettext_noop ("# message delivery deferred (no address)"),
1265 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1266 GNUNET_SCHEDULER_cancel (sched,
1267 neighbour->retry_task);
1268 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (sched,
1270 &retry_transmission_task,
1273 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1274 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1275 mq->message_buf_size,
1276 GNUNET_i2s (&mq->neighbour_id),
1279 /* FIXME: might want to trigger peerinfo lookup here
1280 (unless that's already pending...) */
1283 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1284 neighbour->messages_tail,
1286 if (mq->specific_address->connected == GNUNET_NO)
1287 mq->specific_address->connect_attempts++;
1288 rl = mq->specific_address->ready_list;
1289 mq->plugin = rl->plugin;
1290 if (!mq->internal_msg)
1291 mq->specific_address->in_transmit = GNUNET_YES;
1293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1294 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1295 mq->message_buf_size,
1296 GNUNET_i2s (&neighbour->id),
1297 GNUNET_a2s (mq->specific_address->addr,
1298 mq->specific_address->addrlen),
1299 rl->plugin->short_name);
1301 GNUNET_STATISTICS_update (stats,
1302 gettext_noop ("# bytes in message queue for other peers"),
1303 -mq->message_buf_size,
1305 GNUNET_STATISTICS_update (stats,
1306 gettext_noop ("# bytes transmitted to other peers"),
1307 mq->message_buf_size,
1309 rl->plugin->api->send (rl->plugin->api->cls,
1312 mq->message_buf_size,
1314 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1315 mq->specific_address->addr,
1316 mq->specific_address->addrlen,
1317 GNUNET_YES /* FIXME: sometimes, we want to be more tolerant here! */,
1318 &transmit_send_continuation, mq);
1323 * Send the specified message to the specified peer.
1325 * @param client source of the transmission request (can be NULL)
1326 * @param peer_address ForeignAddressList where we should send this message
1327 * @param priority how important is the message
1328 * @param timeout how long do we have to transmit?
1329 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1330 * @param message_buf_size total size of all messages in message_buf
1331 * @param is_internal is this an internal message; these are pre-pended and
1332 * also do not count for plugins being "ready" to transmit
1333 * @param neighbour handle to the neighbour for transmission
1336 transmit_to_peer (struct TransportClient *client,
1337 struct ForeignAddressList *peer_address,
1338 unsigned int priority,
1339 struct GNUNET_TIME_Relative timeout,
1340 const char *message_buf,
1341 size_t message_buf_size,
1342 int is_internal, struct NeighbourList *neighbour)
1344 struct MessageQueue *mq;
1349 /* check for duplicate submission */
1350 mq = neighbour->messages_head;
1353 if (mq->client == client)
1355 /* client transmitted to same peer twice
1356 before getting SEND_OK! */
1364 GNUNET_STATISTICS_update (stats,
1365 gettext_noop ("# bytes in message queue for other peers"),
1368 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1369 mq->specific_address = peer_address;
1370 mq->client = client;
1371 memcpy (&mq[1], message_buf, message_buf_size);
1372 mq->message_buf = (const char*) &mq[1];
1373 mq->message_buf_size = message_buf_size;
1374 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1375 mq->internal_msg = is_internal;
1376 mq->priority = priority;
1377 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1379 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1380 neighbour->messages_tail,
1383 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1384 neighbour->messages_tail,
1385 neighbour->messages_tail,
1387 try_transmission_to_peer (neighbour);
1394 struct GeneratorContext
1396 struct TransportPlugin *plug_pos;
1397 struct OwnAddressList *addr_pos;
1398 struct GNUNET_TIME_Absolute expiration;
1406 address_generator (void *cls, size_t max, void *buf)
1408 struct GeneratorContext *gc = cls;
1411 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1413 gc->plug_pos = gc->plug_pos->next;
1414 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1416 if (NULL == gc->plug_pos)
1421 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1424 gc->addr_pos->addrlen, buf, max);
1425 gc->addr_pos = gc->addr_pos->next;
1431 * Construct our HELLO message from all of the addresses of
1432 * all of the transports.
1437 struct GNUNET_HELLO_Message *hello;
1438 struct TransportClient *cpos;
1439 struct NeighbourList *npos;
1440 struct GeneratorContext gc;
1442 gc.plug_pos = plugins;
1443 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1444 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1445 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1447 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1448 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1450 GNUNET_STATISTICS_update (stats,
1451 gettext_noop ("# refreshed my HELLO"),
1455 while (cpos != NULL)
1457 transmit_to_client (cpos,
1458 (const struct GNUNET_MessageHeader *) hello,
1463 GNUNET_free_non_null (our_hello);
1465 our_hello_version++;
1466 GNUNET_PEERINFO_add_peer (cfg, sched, &my_identity, our_hello);
1468 while (npos != NULL)
1471 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1472 "Transmitting updated `%s' to neighbour `%4s'\n",
1473 "HELLO", GNUNET_i2s (&npos->id));
1475 GNUNET_STATISTICS_update (stats,
1476 gettext_noop ("# transmitted my HELLO to other peers"),
1479 transmit_to_peer (NULL, NULL, 0,
1480 HELLO_ADDRESS_EXPIRATION,
1481 (const char *) our_hello,
1482 GNUNET_HELLO_size(our_hello),
1490 * Task used to clean up expired addresses for a plugin.
1492 * @param cls closure
1496 expire_address_task (void *cls,
1497 const struct GNUNET_SCHEDULER_TaskContext *tc);
1501 * Update the list of addresses for this plugin,
1502 * expiring those that are past their expiration date.
1504 * @param plugin addresses of which plugin should be recomputed?
1505 * @param fresh set to GNUNET_YES if a new address was added
1506 * and we need to regenerate the HELLO even if nobody
1510 update_addresses (struct TransportPlugin *plugin, int fresh)
1512 struct GNUNET_TIME_Relative min_remaining;
1513 struct GNUNET_TIME_Relative remaining;
1514 struct GNUNET_TIME_Absolute now;
1515 struct OwnAddressList *pos;
1516 struct OwnAddressList *prev;
1517 struct OwnAddressList *next;
1520 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1521 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1522 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1523 now = GNUNET_TIME_absolute_get ();
1524 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1525 expired = GNUNET_NO;
1527 pos = plugin->addresses;
1531 if (pos->expires.value < now.value)
1533 expired = GNUNET_YES;
1535 plugin->addresses = pos->next;
1537 prev->next = pos->next;
1542 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1543 if (remaining.value < min_remaining.value)
1544 min_remaining = remaining;
1550 if (expired || fresh)
1552 if (min_remaining.value < GNUNET_TIME_UNIT_FOREVER_REL.value)
1553 plugin->address_update_task
1554 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1556 &expire_address_task, plugin);
1562 * Task used to clean up expired addresses for a plugin.
1564 * @param cls closure
1568 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1570 struct TransportPlugin *plugin = cls;
1571 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1572 update_addresses (plugin, GNUNET_NO);
1577 * Function that must be called by each plugin to notify the
1578 * transport service about the addresses under which the transport
1579 * provided by the plugin can be reached.
1581 * @param cls closure
1582 * @param name name of the transport that generated the address
1583 * @param addr one of the addresses of the host, NULL for the last address
1584 * the specific address format depends on the transport
1585 * @param addrlen length of the address
1586 * @param expires when should this address automatically expire?
1589 plugin_env_notify_address (void *cls,
1593 struct GNUNET_TIME_Relative expires)
1595 struct TransportPlugin *p = cls;
1596 struct OwnAddressList *al;
1597 struct GNUNET_TIME_Absolute abex;
1599 abex = GNUNET_TIME_relative_to_absolute (expires);
1600 GNUNET_assert (p == find_transport (name));
1605 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
1607 if (al->expires.value < abex.value)
1614 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
1616 al->next = p->addresses;
1619 al->addrlen = addrlen;
1620 memcpy (&al[1], addr, addrlen);
1621 update_addresses (p, GNUNET_YES);
1626 * Notify all of our clients about a peer connecting.
1629 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
1630 struct GNUNET_TIME_Relative latency,
1633 struct ConnectInfoMessage cim;
1634 struct TransportClient *cpos;
1637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1638 "Notifying clients about connection from `%s'\n",
1641 GNUNET_STATISTICS_update (stats,
1642 gettext_noop ("# peers connected"),
1645 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
1646 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
1647 cim.distance = htonl (distance);
1648 cim.latency = GNUNET_TIME_relative_hton (latency);
1649 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
1651 while (cpos != NULL)
1653 transmit_to_client (cpos, &cim.header, GNUNET_NO);
1660 * Notify all of our clients about a peer disconnecting.
1663 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
1665 struct DisconnectInfoMessage dim;
1666 struct TransportClient *cpos;
1669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1670 "Notifying clients about lost connection to `%s'\n",
1673 GNUNET_STATISTICS_update (stats,
1674 gettext_noop ("# peers connected"),
1677 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
1678 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1679 dim.reserved = htonl (0);
1680 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1682 while (cpos != NULL)
1684 transmit_to_client (cpos, &dim.header, GNUNET_NO);
1691 * Find a ForeignAddressList entry for the given neighbour
1692 * that matches the given address and transport.
1694 * @param neighbour which peer we care about
1695 * @param tname name of the transport plugin
1696 * @param addr binary address
1697 * @param addrlen length of addr
1698 * @return NULL if no such entry exists
1700 static struct ForeignAddressList *
1701 find_peer_address(struct NeighbourList *neighbour,
1706 struct ReadyList *head;
1707 struct ForeignAddressList *address_head;
1709 head = neighbour->plugins;
1710 while (head != NULL)
1712 if (0 == strcmp (tname, head->plugin->short_name))
1719 address_head = head->addresses;
1720 while ( (address_head != NULL) &&
1721 ( (address_head->addrlen != addrlen) ||
1722 (memcmp(address_head->addr, addr, addrlen) != 0) ) )
1723 address_head = address_head->next;
1724 return address_head;
1729 * Get the peer address struct for the given neighbour and
1730 * address. If it doesn't yet exist, create it.
1732 * @param neighbour which peer we care about
1733 * @param tname name of the transport plugin
1734 * @param addr binary address
1735 * @param addrlen length of addr
1736 * @return NULL if we do not have a transport plugin for 'tname'
1738 static struct ForeignAddressList *
1739 add_peer_address(struct NeighbourList *neighbour,
1744 struct ReadyList *head;
1745 struct ForeignAddressList *ret;
1747 ret = find_peer_address (neighbour, tname, addr, addrlen);
1750 head = neighbour->plugins;
1751 while (head != NULL)
1753 if (0 == strcmp (tname, head->plugin->short_name))
1759 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
1760 ret->addr = (const char*) &ret[1];
1761 memcpy (&ret[1], addr, addrlen);
1762 ret->addrlen = addrlen;
1763 ret->expires = GNUNET_TIME_relative_to_absolute
1764 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1765 ret->latency = GNUNET_TIME_relative_get_forever();
1767 ret->timeout = GNUNET_TIME_relative_to_absolute
1768 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1769 ret->ready_list = head;
1770 ret->next = head->addresses;
1771 head->addresses = ret;
1777 * Closure for 'add_validated_address'.
1779 struct AddValidatedAddressContext
1782 * Entry that has been validated.
1784 const struct ValidationEntry *ve;
1787 * Flag set after we have added the address so
1788 * that we terminate the iteration next time.
1795 * Callback function used to fill a buffer of max bytes with a list of
1796 * addresses in the format used by HELLOs. Should use
1797 * "GNUNET_HELLO_add_address" as a helper function.
1799 * @param cls the 'struct AddValidatedAddressContext' with the validated address
1800 * @param max maximum number of bytes that can be written to buf
1801 * @param buf where to write the address information
1802 * @return number of bytes written, 0 to signal the
1803 * end of the iteration.
1806 add_validated_address (void *cls,
1807 size_t max, void *buf)
1809 struct AddValidatedAddressContext *avac = cls;
1810 const struct ValidationEntry *ve = avac->ve;
1812 if (GNUNET_YES == avac->done)
1814 avac->done = GNUNET_YES;
1815 return GNUNET_HELLO_add_address (ve->transport_name,
1816 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
1826 * Closure for 'check_address_exists'.
1828 struct CheckAddressExistsClosure
1831 * Address to check for.
1836 * Name of the transport.
1846 * Set to GNUNET_YES if the address exists.
1853 * Iterator over hash map entries. Checks if the given
1854 * validation entry is for the same address as what is given
1857 * @param cls the 'struct CheckAddressExistsClosure*'
1858 * @param key current key code (ignored)
1859 * @param value value in the hash map ('struct ValidationEntry')
1860 * @return GNUNET_YES if we should continue to
1861 * iterate (mismatch), GNUNET_NO if not (entry matched)
1864 check_address_exists (void *cls,
1865 const GNUNET_HashCode * key,
1868 struct CheckAddressExistsClosure *caec = cls;
1869 struct ValidationEntry *ve = value;
1870 if ( (0 == strcmp (caec->tname,
1871 ve->transport_name)) &&
1872 (caec->addrlen == ve->addrlen) &&
1873 (0 == memcmp (caec->addr,
1877 caec->exists = GNUNET_YES;
1885 * HELLO validation cleanup task (validation failed).
1887 * @param cls the 'struct ValidationEntry' that failed
1888 * @param tc scheduler context (unused)
1891 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1893 struct ValidationEntry *va = cls;
1894 struct GNUNET_PeerIdentity pid;
1896 GNUNET_STATISTICS_update (stats,
1897 gettext_noop ("# address validation timeouts"),
1900 GNUNET_CRYPTO_hash (&va->publicKey,
1902 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1904 GNUNET_CONTAINER_multihashmap_remove (validation_map,
1907 GNUNET_free (va->transport_name);
1913 neighbour_timeout_task (void *cls,
1914 const struct GNUNET_SCHEDULER_TaskContext *tc)
1916 struct NeighbourList *n = cls;
1919 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1920 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
1922 GNUNET_STATISTICS_update (stats,
1923 gettext_noop ("# disconnects due to timeout"),
1926 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1927 disconnect_neighbour (n, GNUNET_NO);
1932 * Create a fresh entry in our neighbour list for the given peer.
1933 * Will try to transmit our current HELLO to the new neighbour.
1935 * @param peer the peer for which we create the entry
1936 * @return the new neighbour list entry
1938 static struct NeighbourList *
1939 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer)
1941 struct NeighbourList *n;
1942 struct TransportPlugin *tp;
1943 struct ReadyList *rl;
1945 GNUNET_assert (our_hello != NULL);
1946 GNUNET_STATISTICS_update (stats,
1947 gettext_noop ("# active neighbours"),
1950 n = GNUNET_malloc (sizeof (struct NeighbourList));
1951 n->next = neighbours;
1955 GNUNET_TIME_relative_to_absolute
1956 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1957 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
1958 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1959 MAX_BANDWIDTH_CARRY_S);
1963 if (tp->api->send != NULL)
1965 rl = GNUNET_malloc (sizeof (struct ReadyList));
1966 rl->next = n->plugins;
1969 rl->addresses = NULL;
1973 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
1975 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
1976 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1977 &neighbour_timeout_task, n);
1978 // FIXME: query PEERINFO for HELLO for this peer &
1980 transmit_to_peer (NULL, NULL, 0,
1981 HELLO_ADDRESS_EXPIRATION,
1982 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
1989 * Send periodic PING messages to a give foreign address.
1991 * @param cls our 'struct PeriodicValidationContext*'
1992 * @param tc task context
1995 send_periodic_ping (void *cls,
1996 const struct GNUNET_SCHEDULER_TaskContext *tc)
1998 struct PeriodicValidationContext *pvc = cls;
1999 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey = pvc->publicKey;
2000 char *tname = pvc->transport;
2001 const void *addr = pvc->foreign_address->addr;
2002 size_t addrlen = pvc->foreign_address->addrlen;
2003 struct GNUNET_PeerIdentity id;
2004 struct TransportPlugin *tp;
2005 struct ValidationEntry *va;
2006 struct NeighbourList *neighbour;
2007 struct ForeignAddressList *peer_address;
2008 struct TransportPingMessage ping;
2009 struct CheckAddressExistsClosure caec;
2011 uint16_t hello_size;
2015 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
2017 /* We have been shutdown, don't do anything! */
2018 GNUNET_free (tname);
2021 tp = find_transport (tname);
2024 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
2025 GNUNET_ERROR_TYPE_BULK,
2027 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
2029 GNUNET_free (tname);
2033 GNUNET_CRYPTO_hash (&publicKey,
2035 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2038 caec.addrlen = addrlen;
2040 caec.exists = GNUNET_NO;
2041 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2042 &check_address_exists,
2044 if (caec.exists == GNUNET_YES)
2046 /* During validation attempts we will likely trigger the other
2047 peer trying to validate our address which in turn will cause
2048 it to send us its HELLO, so we expect to hit this case rather
2049 frequently. Only print something if we are very verbose. */
2050 #if DEBUG_TRANSPORT > 1
2051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2052 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
2053 GNUNET_a2s (addr, addrlen),
2057 GNUNET_free (tname);
2060 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
2061 va->transport_name = tname;
2062 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2064 va->send_time = GNUNET_TIME_absolute_get();
2065 va->addr = (const void*) &va[1];
2066 memcpy (&va[1], addr, addrlen);
2067 va->addrlen = addrlen;
2068 memcpy(&va->publicKey, &publicKey, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2069 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2070 HELLO_VERIFICATION_TIMEOUT,
2071 &timeout_hello_validation,
2073 GNUNET_CONTAINER_multihashmap_put (validation_map,
2076 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2077 neighbour = find_neighbour(&id);
2078 /* FIXME: can neighbour be NULL here? (why do we still PING?)? If so,
2079 should we even do this? */
2080 if (neighbour == NULL)
2081 neighbour = setup_new_neighbour(&id);
2082 peer_address = add_peer_address(neighbour, tname, addr, addrlen);
2083 GNUNET_assert(peer_address != NULL);
2084 hello_size = GNUNET_HELLO_size(our_hello);
2085 tsize = sizeof(struct TransportPingMessage) + hello_size;
2086 message_buf = GNUNET_malloc(tsize);
2087 ping.challenge = htonl(va->challenge);
2088 ping.header.size = htons(sizeof(struct TransportPingMessage));
2089 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
2090 memcpy(&ping.target, &id, sizeof(struct GNUNET_PeerIdentity));
2091 memcpy(message_buf, our_hello, hello_size);
2092 memcpy(&message_buf[hello_size],
2094 sizeof(struct TransportPingMessage));
2095 #if DEBUG_TRANSPORT_REVALIDATION
2096 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2097 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
2098 GNUNET_a2s (addr, addrlen),
2101 "HELLO", hello_size,
2102 "PING", sizeof (struct TransportPingMessage));
2104 GNUNET_STATISTICS_update (stats,
2105 gettext_noop ("# PING messages sent for re-validation"),
2108 transmit_to_peer (NULL, peer_address,
2109 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2110 HELLO_VERIFICATION_TIMEOUT,
2112 GNUNET_YES, neighbour);
2113 GNUNET_free(message_buf);
2118 * Iterator over hash map entries. Checks if the given validation
2119 * entry is for the same challenge as what is given in the PONG.
2121 * @param cls the 'struct TransportPongMessage*'
2122 * @param key peer identity
2123 * @param value value in the hash map ('struct ValidationEntry')
2124 * @return GNUNET_YES if we should continue to
2125 * iterate (mismatch), GNUNET_NO if not (entry matched)
2128 check_pending_validation (void *cls,
2129 const GNUNET_HashCode * key,
2132 const struct TransportPongMessage *pong = cls;
2133 struct ValidationEntry *ve = value;
2134 struct AddValidatedAddressContext avac;
2135 unsigned int challenge = ntohl(pong->challenge);
2136 struct GNUNET_HELLO_Message *hello;
2137 struct GNUNET_PeerIdentity target;
2138 struct NeighbourList *n;
2139 struct ForeignAddressList *fal;
2140 struct PeriodicValidationContext *periodic_validation_context;
2142 if (ve->challenge != challenge)
2146 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2147 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
2149 GNUNET_a2s ((const struct sockaddr *) ve->addr,
2151 ve->transport_name);
2153 GNUNET_STATISTICS_update (stats,
2154 gettext_noop ("# address validation successes"),
2157 /* create the updated HELLO */
2158 GNUNET_CRYPTO_hash (&ve->publicKey,
2159 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2160 &target.hashPubKey);
2161 avac.done = GNUNET_NO;
2163 hello = GNUNET_HELLO_create (&ve->publicKey,
2164 &add_validated_address,
2166 GNUNET_PEERINFO_add_peer (cfg, sched,
2169 GNUNET_free (hello);
2170 n = find_neighbour (&target);
2173 fal = add_peer_address (n,
2177 GNUNET_assert (fal != NULL);
2178 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
2179 fal->validated = GNUNET_YES;
2180 GNUNET_STATISTICS_update (stats,
2181 gettext_noop ("# peer addresses considered valid"),
2184 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
2185 periodic_validation_context = GNUNET_malloc(sizeof(struct PeriodicValidationContext));
2186 periodic_validation_context->foreign_address = fal;
2187 periodic_validation_context->transport = strdup(ve->transport_name);
2188 memcpy(&periodic_validation_context->publicKey,
2190 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2191 /* FIXME: this causes all of the revalidation PINGs for the same HELLO
2192 to be transmitted in bulk, which is not nice; also,
2193 triggering these HERE means that revalidations do NOT happen AT ALL
2194 for HELLOs a previous instance of this process validated (since
2195 there is no "initial" validation PING => no revalidation => BUG! */
2196 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(sched,
2197 TRANSPORT_DEFAULT_REVALIDATION,
2198 &send_periodic_ping,
2199 periodic_validation_context);
2200 if (n->latency.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
2201 n->latency = fal->latency;
2203 n->latency.value = (fal->latency.value + n->latency.value) / 2;
2204 n->distance = fal->distance;
2205 if (GNUNET_NO == n->received_pong)
2207 notify_clients_connect (&target, n->latency, n->distance);
2208 n->received_pong = GNUNET_YES;
2210 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
2212 GNUNET_SCHEDULER_cancel (sched,
2214 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
2215 try_transmission_to_peer (n);
2219 /* clean up validation entry */
2220 GNUNET_assert (GNUNET_YES ==
2221 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2224 GNUNET_SCHEDULER_cancel (sched,
2226 GNUNET_free (ve->transport_name);
2233 * Function that will be called if we receive a validation
2234 * of an address challenge that we transmitted to another
2235 * peer. Note that the validation should only be considered
2236 * acceptable if the challenge matches AND if the sender
2237 * address is at least a plausible address for this peer
2238 * (otherwise we may be seeing a MiM attack).
2240 * @param cls closure
2241 * @param message the pong message
2242 * @param peer who responded to our challenge
2243 * @param sender_address string describing our sender address (as observed
2244 * by the other peer in binary format)
2245 * @param sender_address_len number of bytes in 'sender_address'
2248 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
2249 const struct GNUNET_PeerIdentity *peer,
2250 const char *sender_address,
2251 size_t sender_address_len)
2253 #if DEBUG_TRANSPORT > 1
2254 /* we get tons of these that just get discarded, only log
2255 if we are quite verbose */
2256 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2257 "Receiving `%s' message from `%4s'.\n", "PONG",
2260 GNUNET_STATISTICS_update (stats,
2261 gettext_noop ("# PONG messages received"),
2264 if (GNUNET_SYSERR !=
2265 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
2267 &check_pending_validation,
2270 /* This is *expected* to happen a lot since we send
2271 PONGs to *all* known addresses of the sender of
2272 the PING, so most likely we get multiple PONGs
2273 per PING, and all but the first PONG will end up
2274 here. So really we should not print anything here
2275 unless we want to be very, very verbose... */
2276 #if DEBUG_TRANSPORT > 2
2277 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2278 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
2287 /* FIXME: add given address to potential pool of our addresses
2289 GNUNET_log (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
2290 _("Another peer saw us using the address `%s' via `%s'.\n"),
2291 GNUNET_a2s ((const struct sockaddr *) &pong[1],
2292 ntohs(pong->addrlen)),
2293 va->transport_name);
2299 * Check if the given address is already being validated; if not,
2300 * append the given address to the list of entries that are being be
2301 * validated and initiate validation.
2303 * @param cls closure ('struct CheckHelloValidatedContext *')
2304 * @param tname name of the transport
2305 * @param expiration expiration time
2306 * @param addr the address
2307 * @param addrlen length of the address
2308 * @return GNUNET_OK (always)
2311 run_validation (void *cls,
2313 struct GNUNET_TIME_Absolute expiration,
2314 const void *addr, size_t addrlen)
2316 struct CheckHelloValidatedContext *chvc = cls;
2317 struct GNUNET_PeerIdentity id;
2318 struct TransportPlugin *tp;
2319 struct ValidationEntry *va;
2320 struct NeighbourList *neighbour;
2321 struct ForeignAddressList *peer_address;
2322 struct TransportPingMessage ping;
2323 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
2324 struct CheckAddressExistsClosure caec;
2326 uint16_t hello_size;
2329 GNUNET_STATISTICS_update (stats,
2330 gettext_noop ("# peer addresses scheduled for validation"),
2333 tp = find_transport (tname);
2336 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
2337 GNUNET_ERROR_TYPE_BULK,
2339 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
2341 GNUNET_STATISTICS_update (stats,
2342 gettext_noop ("# peer addresses not validated (no applicable transport plugin available)"),
2347 GNUNET_HELLO_get_key (chvc->hello, &pk);
2348 GNUNET_CRYPTO_hash (&pk,
2350 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2353 caec.addrlen = addrlen;
2355 caec.exists = GNUNET_NO;
2356 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2357 &check_address_exists,
2359 if (caec.exists == GNUNET_YES)
2361 /* During validation attempts we will likely trigger the other
2362 peer trying to validate our address which in turn will cause
2363 it to send us its HELLO, so we expect to hit this case rather
2364 frequently. Only print something if we are very verbose. */
2365 #if DEBUG_TRANSPORT > 1
2366 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2367 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
2368 GNUNET_a2s (addr, addrlen),
2372 GNUNET_STATISTICS_update (stats,
2373 gettext_noop ("# peer addresses not validated (in progress)"),
2378 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
2379 va->transport_name = GNUNET_strdup (tname);
2380 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2382 va->send_time = GNUNET_TIME_absolute_get();
2383 va->addr = (const void*) &va[1];
2384 memcpy (&va[1], addr, addrlen);
2385 va->addrlen = addrlen;
2386 GNUNET_HELLO_get_key (chvc->hello,
2388 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2389 HELLO_VERIFICATION_TIMEOUT,
2390 &timeout_hello_validation,
2392 GNUNET_CONTAINER_multihashmap_put (validation_map,
2395 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2396 neighbour = find_neighbour(&id);
2397 if (neighbour == NULL)
2398 neighbour = setup_new_neighbour(&id);
2399 peer_address = add_peer_address(neighbour, tname, addr, addrlen);
2400 GNUNET_assert(peer_address != NULL);
2401 hello_size = GNUNET_HELLO_size(our_hello);
2402 tsize = sizeof(struct TransportPingMessage) + hello_size;
2403 message_buf = GNUNET_malloc(tsize);
2404 ping.challenge = htonl(va->challenge);
2405 ping.header.size = htons(sizeof(struct TransportPingMessage));
2406 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
2407 memcpy(&ping.target, &id, sizeof(struct GNUNET_PeerIdentity));
2408 memcpy(message_buf, our_hello, hello_size);
2409 memcpy(&message_buf[hello_size],
2411 sizeof(struct TransportPingMessage));
2413 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2414 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
2415 GNUNET_a2s (addr, addrlen),
2418 "HELLO", hello_size,
2419 "PING", sizeof (struct TransportPingMessage));
2421 GNUNET_STATISTICS_update (stats,
2422 gettext_noop ("# PING messages sent for initial validation"),
2425 transmit_to_peer (NULL, peer_address,
2426 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2427 HELLO_VERIFICATION_TIMEOUT,
2429 GNUNET_YES, neighbour);
2430 GNUNET_free(message_buf);
2436 * Add the given address to the list of foreign addresses
2437 * available for the given peer (check for duplicates).
2439 * @param cls the respective 'struct NeighbourList' to update
2440 * @param tname name of the transport
2441 * @param expiration expiration time
2442 * @param addr the address
2443 * @param addrlen length of the address
2444 * @return GNUNET_OK (always)
2447 add_to_foreign_address_list (void *cls,
2449 struct GNUNET_TIME_Absolute expiration,
2450 const void *addr, size_t addrlen)
2452 struct NeighbourList *n = cls;
2453 struct ForeignAddressList *fal;
2456 GNUNET_STATISTICS_update (stats,
2457 gettext_noop ("# valid peer addresses returned by peerinfo"),
2461 fal = find_peer_address (n, tname, addr, addrlen);
2465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2466 "Adding address `%s' (%s) for peer `%4s' due to peerinfo data for %llums.\n",
2467 GNUNET_a2s (addr, addrlen),
2469 GNUNET_i2s (&n->id),
2472 fal = add_peer_address (n, tname, addr, addrlen);
2475 GNUNET_STATISTICS_update (stats,
2476 gettext_noop ("# previously validated addresses lacking transport"),
2484 fal->expires = GNUNET_TIME_absolute_max (expiration,
2486 if (fal->validated == GNUNET_NO)
2488 fal->validated = GNUNET_YES;
2489 GNUNET_STATISTICS_update (stats,
2490 gettext_noop ("# peer addresses considered valid"),
2494 if (try == GNUNET_YES)
2495 try_transmission_to_peer (n);
2501 * Check if addresses in validated hello "h" overlap with
2502 * those in "chvc->hello" and validate the rest.
2504 * @param cls closure
2505 * @param peer id of the peer, NULL for last call
2506 * @param h hello message for the peer (can be NULL)
2507 * @param trust amount of trust we have in the peer (not used)
2510 check_hello_validated (void *cls,
2511 const struct GNUNET_PeerIdentity *peer,
2512 const struct GNUNET_HELLO_Message *h,
2515 struct CheckHelloValidatedContext *chvc = cls;
2516 struct GNUNET_HELLO_Message *plain_hello;
2517 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
2518 struct GNUNET_PeerIdentity target;
2519 struct NeighbourList *n;
2524 GNUNET_CONTAINER_DLL_remove (chvc_head,
2527 if (GNUNET_NO == chvc->hello_known)
2529 /* notify PEERINFO about the peer now, so that we at least
2530 have the public key if some other component needs it */
2531 GNUNET_HELLO_get_key (chvc->hello, &pk);
2532 GNUNET_CRYPTO_hash (&pk,
2533 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2534 &target.hashPubKey);
2535 plain_hello = GNUNET_HELLO_create (&pk,
2538 GNUNET_PEERINFO_add_peer (cfg, sched, &target, plain_hello);
2539 GNUNET_free (plain_hello);
2541 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2542 "Peerinfo had no `%s' message for peer `%4s', full validation needed.\n",
2544 GNUNET_i2s (&target));
2546 GNUNET_STATISTICS_update (stats,
2547 gettext_noop ("# new HELLOs requiring full validation"),
2550 GNUNET_HELLO_iterate_addresses (chvc->hello,
2557 GNUNET_STATISTICS_update (stats,
2558 gettext_noop ("# duplicate HELLO (peer known)"),
2568 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2569 "Peerinfo had `%s' message for peer `%4s', validating only new addresses.\n",
2573 chvc->hello_known = GNUNET_YES;
2574 n = find_neighbour (peer);
2577 GNUNET_HELLO_iterate_addresses (h,
2579 &add_to_foreign_address_list,
2581 try_transmission_to_peer (n);
2585 GNUNET_STATISTICS_update (stats,
2586 gettext_noop ("# no existing neighbour record while validating HELLO"),
2590 GNUNET_STATISTICS_update (stats,
2591 gettext_noop ("# HELLO validations (update case)"),
2594 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
2596 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
2602 * Process HELLO-message.
2604 * @param plugin transport involved, may be NULL
2605 * @param message the actual message
2606 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
2609 process_hello (struct TransportPlugin *plugin,
2610 const struct GNUNET_MessageHeader *message)
2613 struct GNUNET_PeerIdentity target;
2614 const struct GNUNET_HELLO_Message *hello;
2615 struct CheckHelloValidatedContext *chvc;
2616 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
2618 hsize = ntohs (message->size);
2619 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
2620 (hsize < sizeof (struct GNUNET_MessageHeader)))
2623 return GNUNET_SYSERR;
2625 GNUNET_STATISTICS_update (stats,
2626 gettext_noop ("# HELLOs received for validation"),
2629 /* first, check if load is too high */
2630 if (GNUNET_SCHEDULER_get_load (sched,
2631 GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
2633 GNUNET_STATISTICS_update (stats,
2634 gettext_noop ("# HELLOs ignored due to high load"),
2639 hello = (const struct GNUNET_HELLO_Message *) message;
2640 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
2642 GNUNET_break_op (0);
2643 return GNUNET_SYSERR;
2645 GNUNET_CRYPTO_hash (&publicKey,
2646 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2647 &target.hashPubKey);
2648 if (0 == memcmp (&my_identity,
2650 sizeof (struct GNUNET_PeerIdentity)))
2652 GNUNET_STATISTICS_update (stats,
2653 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
2658 #if DEBUG_TRANSPORT > 1
2659 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2660 "Processing `%s' message for `%4s' of size %u\n",
2662 GNUNET_i2s (&target),
2663 GNUNET_HELLO_size(hello));
2665 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
2666 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
2667 memcpy (&chvc[1], hello, hsize);
2668 GNUNET_CONTAINER_DLL_insert (chvc_head,
2671 /* finally, check if HELLO was previously validated
2672 (continuation will then schedule actual validation) */
2673 chvc->piter = GNUNET_PEERINFO_iterate (cfg,
2677 HELLO_VERIFICATION_TIMEOUT,
2678 &check_hello_validated, chvc);
2684 * The peer specified by the given neighbour has timed-out or a plugin
2685 * has disconnected. We may either need to do nothing (other plugins
2686 * still up), or trigger a full disconnect and clean up. This
2687 * function updates our state and does the necessary notifications.
2688 * Also notifies our clients that the neighbour is now officially
2691 * @param n the neighbour list entry for the peer
2692 * @param check should we just check if all plugins
2693 * disconnected or must we ask all plugins to
2697 disconnect_neighbour (struct NeighbourList *n, int check)
2699 struct ReadyList *rpos;
2700 struct NeighbourList *npos;
2701 struct NeighbourList *nprev;
2702 struct MessageQueue *mq;
2703 struct ForeignAddressList *peer_addresses;
2704 struct ForeignAddressList *peer_pos;
2706 if (GNUNET_YES == check)
2709 while (NULL != rpos)
2711 peer_addresses = rpos->addresses;
2712 while (peer_addresses != NULL)
2714 if (GNUNET_YES == peer_addresses->connected)
2715 return; /* still connected */
2716 peer_addresses = peer_addresses->next;
2722 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2723 "Disconnecting from `%4s'\n",
2724 GNUNET_i2s (&n->id));
2726 /* remove n from neighbours list */
2729 while ((npos != NULL) && (npos != n))
2734 GNUNET_assert (npos != NULL);
2736 neighbours = n->next;
2738 nprev->next = n->next;
2740 /* notify all clients about disconnect */
2741 if (GNUNET_YES == n->received_pong)
2742 notify_clients_disconnect (&n->id);
2744 /* clean up all plugins, cancel connections and pending transmissions */
2745 while (NULL != (rpos = n->plugins))
2747 n->plugins = rpos->next;
2748 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
2749 while (rpos->addresses != NULL)
2751 peer_pos = rpos->addresses;
2752 rpos->addresses = peer_pos->next;
2753 if (peer_pos->connected == GNUNET_YES)
2754 GNUNET_STATISTICS_update (stats,
2755 gettext_noop ("# connected addresses"),
2758 if (GNUNET_YES == peer_pos->validated)
2759 GNUNET_STATISTICS_update (stats,
2760 gettext_noop ("# peer addresses considered valid"),
2763 GNUNET_free(peer_pos);
2768 /* free all messages on the queue */
2769 while (NULL != (mq = n->messages_head))
2771 GNUNET_STATISTICS_update (stats,
2772 gettext_noop ("# bytes in message queue for other peers"),
2773 -mq->message_buf_size,
2775 GNUNET_STATISTICS_update (stats,
2776 gettext_noop ("# bytes discarded due to disconnect"),
2777 mq->message_buf_size,
2779 GNUNET_CONTAINER_DLL_remove (n->messages_head,
2782 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
2784 sizeof(struct GNUNET_PeerIdentity)));
2787 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
2789 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
2790 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2792 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
2794 GNUNET_SCHEDULER_cancel (sched, n->retry_task);
2795 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
2797 /* finally, free n itself */
2798 GNUNET_STATISTICS_update (stats,
2799 gettext_noop ("# active neighbours"),
2807 * We have received a PING message from someone. Need to send a PONG message
2808 * in response to the peer by any means necessary.
2810 * FIXME: With something like TCP where a connection exists, we may
2811 * want to send it that way. But the current API does not seem to
2812 * allow us to do so (can't tell this to the transport!)
2815 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
2816 const struct GNUNET_PeerIdentity *peer,
2817 const char *sender_address,
2818 size_t sender_address_len)
2820 struct TransportPlugin *plugin = cls;
2821 struct TransportPingMessage *ping;
2822 struct TransportPongMessage *pong;
2823 struct NeighbourList *n;
2824 struct ReadyList *rl;
2825 struct ForeignAddressList *fal;
2827 if (ntohs (message->size) != sizeof (struct TransportPingMessage))
2829 GNUNET_break_op (0);
2830 return GNUNET_SYSERR;
2832 ping = (struct TransportPingMessage *) message;
2833 if (0 != memcmp (&ping->target,
2834 plugin->env.my_identity,
2835 sizeof (struct GNUNET_PeerIdentity)))
2837 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2838 _("Received `%s' message not destined for me!\n"),
2840 return GNUNET_SYSERR;
2843 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2844 "Processing `%s' from `%s'\n",
2846 GNUNET_a2s ((const struct sockaddr *)sender_address,
2847 sender_address_len));
2849 GNUNET_STATISTICS_update (stats,
2850 gettext_noop ("# PING messages received"),
2853 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len);
2854 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len);
2855 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
2856 pong->purpose.size =
2857 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2859 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sender_address_len);
2860 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_TCP_PING);
2861 pong->challenge = ping->challenge;
2862 pong->addrlen = htons(sender_address_len);
2863 memcpy(&pong->signer,
2865 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2866 memcpy (&pong[1], sender_address, sender_address_len);
2867 GNUNET_assert (GNUNET_OK ==
2868 GNUNET_CRYPTO_rsa_sign (my_private_key,
2869 &pong->purpose, &pong->signature));
2871 n = find_neighbour(peer);
2873 n = setup_new_neighbour(peer);
2874 /* broadcast 'PONG' to all available addresses */
2878 fal = rl->addresses;
2881 transmit_to_peer(NULL, fal,
2882 TRANSPORT_PONG_PRIORITY,
2883 HELLO_VERIFICATION_TIMEOUT,
2885 ntohs(pong->header.size),
2898 * Function called by the plugin for each received message.
2899 * Update data volumes, possibly notify plugins about
2900 * reducing the rate at which they read from the socket
2901 * and generally forward to our receive callback.
2903 * @param cls the "struct TransportPlugin *" we gave to the plugin
2904 * @param peer (claimed) identity of the other peer
2905 * @param message the message, NULL if we only care about
2906 * learning about the delay until we should receive again
2907 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
2908 * @param sender_address binary address of the sender (if observed)
2909 * @param sender_address_len number of bytes in sender_address
2910 * @return how long the plugin should wait until receiving more data
2911 * (plugins that do not support this, can ignore the return value)
2913 static struct GNUNET_TIME_Relative
2914 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
2915 const struct GNUNET_MessageHeader *message,
2916 unsigned int distance, const char *sender_address,
2917 size_t sender_address_len)
2919 struct ReadyList *service_context;
2920 struct TransportPlugin *plugin = cls;
2921 struct TransportClient *cpos;
2922 struct InboundMessage *im;
2923 struct ForeignAddressList *peer_address;
2925 struct NeighbourList *n;
2926 struct GNUNET_TIME_Relative ret;
2928 n = find_neighbour (peer);
2930 n = setup_new_neighbour (peer);
2931 service_context = n->plugins;
2932 while ((service_context != NULL) && (plugin != service_context->plugin))
2933 service_context = service_context->next;
2934 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
2935 if (message != NULL)
2937 peer_address = add_peer_address(n,
2940 sender_address_len);
2941 if (peer_address != NULL)
2943 peer_address->distance = distance;
2944 if (peer_address->connected == GNUNET_NO)
2946 peer_address->connected = GNUNET_YES;
2947 peer_address->connect_attempts++;
2948 GNUNET_STATISTICS_update (stats,
2949 gettext_noop ("# connected addresses"),
2953 peer_address->timeout
2955 GNUNET_TIME_relative_to_absolute
2956 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2958 /* update traffic received amount ... */
2959 msize = ntohs (message->size);
2960 GNUNET_STATISTICS_update (stats,
2961 gettext_noop ("# bytes received from other peers"),
2964 n->distance = distance;
2966 GNUNET_TIME_relative_to_absolute
2967 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2968 GNUNET_SCHEDULER_cancel (sched,
2971 GNUNET_SCHEDULER_add_delayed (sched,
2972 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2973 &neighbour_timeout_task, n);
2974 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
2976 /* dropping message due to frequent inbound volume violations! */
2977 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
2978 GNUNET_ERROR_TYPE_BULK,
2980 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
2981 n->in_tracker.available_bytes_per_s__,
2982 n->quota_violation_count);
2983 GNUNET_STATISTICS_update (stats,
2984 gettext_noop ("# bandwidth quota violations by other peers"),
2987 return GNUNET_TIME_UNIT_MINUTES; /* minimum penalty, likely ignored (UDP...) */
2989 switch (ntohs (message->type))
2991 case GNUNET_MESSAGE_TYPE_HELLO:
2992 GNUNET_STATISTICS_update (stats,
2993 gettext_noop ("# HELLO messages received from other peers"),
2996 process_hello (plugin, message);
2998 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
2999 handle_ping(plugin, message, peer, sender_address, sender_address_len);
3001 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
3002 handle_pong(plugin, message, peer, sender_address, sender_address_len);
3006 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3007 "Received message of type %u from `%4s', sending to all clients.\n",
3008 ntohs (message->type), GNUNET_i2s (peer));
3010 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3012 n->quota_violation_count++;
3014 n->quota_violation_count = 0; /* back within limits */
3015 GNUNET_STATISTICS_update (stats,
3016 gettext_noop ("# payload received from other peers"),
3019 /* transmit message to all clients */
3020 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3021 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3022 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3023 im->latency = GNUNET_TIME_relative_hton (n->latency);
3025 memcpy (&im[1], message, msize);
3027 while (cpos != NULL)
3029 transmit_to_client (cpos, &im->header, GNUNET_YES);
3035 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
3038 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3039 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
3040 (unsigned long long) n->in_tracker.consumption_since_last_update__,
3041 (unsigned int) n->in_tracker.available_bytes_per_s__,
3042 (unsigned long long) ret.value);
3043 GNUNET_STATISTICS_update (stats,
3044 gettext_noop ("# ms throttling suggested"),
3045 (int64_t) ret.value,
3053 * Handle START-message. This is the first message sent to us
3054 * by any client which causes us to add it to our list.
3056 * @param cls closure (always NULL)
3057 * @param client identification of the client
3058 * @param message the actual message
3061 handle_start (void *cls,
3062 struct GNUNET_SERVER_Client *client,
3063 const struct GNUNET_MessageHeader *message)
3065 struct TransportClient *c;
3066 struct ConnectInfoMessage cim;
3067 struct NeighbourList *n;
3070 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3071 "Received `%s' request from client\n", "START");
3076 if (c->client == client)
3078 /* client already on our list! */
3080 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3085 c = GNUNET_malloc (sizeof (struct TransportClient));
3089 if (our_hello != NULL)
3092 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3093 "Sending our own `%s' to new client\n", "HELLO");
3095 transmit_to_client (c,
3096 (const struct GNUNET_MessageHeader *) our_hello,
3098 /* tell new client about all existing connections */
3099 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
3100 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
3104 if (GNUNET_YES == n->received_pong)
3107 cim.latency = GNUNET_TIME_relative_hton (n->latency);
3108 cim.distance = htonl (n->distance);
3109 transmit_to_client (c, &cim.header, GNUNET_NO);
3114 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3119 * Handle HELLO-message.
3121 * @param cls closure (always NULL)
3122 * @param client identification of the client
3123 * @param message the actual message
3126 handle_hello (void *cls,
3127 struct GNUNET_SERVER_Client *client,
3128 const struct GNUNET_MessageHeader *message)
3132 GNUNET_STATISTICS_update (stats,
3133 gettext_noop ("# HELLOs received from clients"),
3136 ret = process_hello (NULL, message);
3137 GNUNET_SERVER_receive_done (client, ret);
3142 * Handle SEND-message.
3144 * @param cls closure (always NULL)
3145 * @param client identification of the client
3146 * @param message the actual message
3149 handle_send (void *cls,
3150 struct GNUNET_SERVER_Client *client,
3151 const struct GNUNET_MessageHeader *message)
3153 struct TransportClient *tc;
3154 struct NeighbourList *n;
3155 const struct OutboundMessage *obm;
3156 const struct GNUNET_MessageHeader *obmm;
3160 size = ntohs (message->size);
3162 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
3165 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3168 GNUNET_STATISTICS_update (stats,
3169 gettext_noop ("# payload received for other peers"),
3172 obm = (const struct OutboundMessage *) message;
3174 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3175 "Received `%s' request from client with target `%4s'\n",
3176 "SEND", GNUNET_i2s (&obm->peer));
3178 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
3179 msize = ntohs (obmm->size);
3180 if (size != msize + sizeof (struct OutboundMessage))
3183 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3186 n = find_neighbour (&obm->peer);
3188 n = setup_new_neighbour (&obm->peer);
3190 while ((tc != NULL) && (tc->client != client))
3194 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3195 "Client asked to transmit %u-byte message of type %u to `%4s'\n",
3197 ntohs (obmm->type), GNUNET_i2s (&obm->peer));
3199 transmit_to_peer (tc, NULL, ntohl (obm->priority),
3200 GNUNET_TIME_relative_ntoh (obm->timeout),
3202 ntohs (obmm->size), GNUNET_NO, n);
3203 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3208 * Handle SET_QUOTA-message.
3210 * @param cls closure (always NULL)
3211 * @param client identification of the client
3212 * @param message the actual message
3215 handle_set_quota (void *cls,
3216 struct GNUNET_SERVER_Client *client,
3217 const struct GNUNET_MessageHeader *message)
3219 const struct QuotaSetMessage *qsm =
3220 (const struct QuotaSetMessage *) message;
3221 struct NeighbourList *n;
3223 GNUNET_STATISTICS_update (stats,
3224 gettext_noop ("# SET QUOTA messages received"),
3227 n = find_neighbour (&qsm->peer);
3230 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3231 GNUNET_STATISTICS_update (stats,
3232 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
3238 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3239 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
3241 (unsigned int) ntohl (qsm->quota.value__),
3242 (unsigned int) n->in_tracker.available_bytes_per_s__,
3243 GNUNET_i2s (&qsm->peer));
3245 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
3247 if (0 == ntohl (qsm->quota.value__))
3248 disconnect_neighbour (n, GNUNET_NO);
3249 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3254 transmit_address_to_client (void *cls, const char *address)
3256 struct GNUNET_SERVER_TransmitContext *tc = cls;
3259 if (NULL == address)
3262 slen = strlen (address) + 1;
3263 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
3264 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
3265 if (NULL == address)
3266 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
3271 * Handle AddressLookup-message.
3273 * @param cls closure (always NULL)
3274 * @param client identification of the client
3275 * @param message the actual message
3278 handle_address_lookup (void *cls,
3279 struct GNUNET_SERVER_Client *client,
3280 const struct GNUNET_MessageHeader *message)
3282 const struct AddressLookupMessage *alum;
3283 struct TransportPlugin *lsPlugin;
3284 const char *nameTransport;
3285 const char *address;
3287 struct GNUNET_SERVER_TransmitContext *tc;
3289 size = ntohs (message->size);
3290 if (size < sizeof (struct AddressLookupMessage))
3292 GNUNET_break_op (0);
3293 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3296 alum = (const struct AddressLookupMessage *) message;
3297 uint32_t addressLen = ntohl (alum->addrlen);
3298 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
3300 GNUNET_break_op (0);
3301 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3304 address = (const char *) &alum[1];
3305 nameTransport = (const char *) &address[addressLen];
3307 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
3309 GNUNET_break_op (0);
3310 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3313 struct GNUNET_TIME_Absolute timeout =
3314 GNUNET_TIME_absolute_ntoh (alum->timeout);
3315 struct GNUNET_TIME_Relative rtimeout =
3316 GNUNET_TIME_absolute_get_remaining (timeout);
3317 lsPlugin = find_transport (nameTransport);
3318 if (NULL == lsPlugin)
3320 tc = GNUNET_SERVER_transmit_context_create (client);
3321 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
3322 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
3323 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
3326 tc = GNUNET_SERVER_transmit_context_create (client);
3327 lsPlugin->api->address_pretty_printer (cls, nameTransport,
3328 address, addressLen, GNUNET_YES,
3330 &transmit_address_to_client, tc);
3334 * List of handlers for the messages understood by this
3337 static struct GNUNET_SERVER_MessageHandler handlers[] = {
3338 {&handle_start, NULL,
3339 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
3340 {&handle_hello, NULL,
3341 GNUNET_MESSAGE_TYPE_HELLO, 0},
3342 {&handle_send, NULL,
3343 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
3344 {&handle_set_quota, NULL,
3345 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
3346 {&handle_address_lookup, NULL,
3347 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
3354 * Setup the environment for this plugin.
3357 create_environment (struct TransportPlugin *plug)
3359 plug->env.cfg = cfg;
3360 plug->env.sched = sched;
3361 plug->env.my_identity = &my_identity;
3362 plug->env.cls = plug;
3363 plug->env.receive = &plugin_env_receive;
3364 plug->env.notify_address = &plugin_env_notify_address;
3365 plug->env.max_connections = max_connect_per_transport;
3366 plug->env.stats = stats;
3371 * Start the specified transport (load the plugin).
3374 start_transport (struct GNUNET_SERVER_Handle *server, const char *name)
3376 struct TransportPlugin *plug;
3379 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3380 _("Loading `%s' transport plugin\n"), name);
3381 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
3382 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
3383 create_environment (plug);
3384 plug->short_name = GNUNET_strdup (name);
3385 plug->lib_name = libname;
3386 plug->next = plugins;
3388 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
3389 if (plug->api == NULL)
3391 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3392 _("Failed to load transport plugin for `%s'\n"), name);
3393 GNUNET_free (plug->short_name);
3394 plugins = plug->next;
3395 GNUNET_free (libname);
3402 * Called whenever a client is disconnected. Frees our
3403 * resources associated with that client.
3405 * @param cls closure
3406 * @param client identification of the client
3409 client_disconnect_notification (void *cls,
3410 struct GNUNET_SERVER_Client *client)
3412 struct TransportClient *pos;
3413 struct TransportClient *prev;
3414 struct ClientMessageQueueEntry *mqe;
3419 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
3420 "Client disconnected, cleaning up.\n");
3424 while ((pos != NULL) && (pos->client != client))
3431 while (NULL != (mqe = pos->message_queue_head))
3433 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
3434 pos->message_queue_tail,
3436 pos->message_count--;
3440 clients = pos->next;
3442 prev->next = pos->next;
3443 if (GNUNET_YES == pos->tcs_pending)
3448 if (pos->th != NULL)
3450 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
3453 GNUNET_break (0 == pos->message_count);
3459 * Iterator to free entries in the validation_map.
3461 * @param cls closure (unused)
3462 * @param key current key code
3463 * @param value value in the hash map (validation to abort)
3464 * @return GNUNET_YES (always)
3467 abort_validation (void *cls,
3468 const GNUNET_HashCode * key,
3471 struct ValidationEntry *va = value;
3473 GNUNET_SCHEDULER_cancel (sched, va->timeout_task);
3474 GNUNET_free (va->transport_name);
3481 * Function called when the service shuts down. Unloads our plugins
3482 * and cancels pending validations.
3484 * @param cls closure, unused
3485 * @param tc task context (unused)
3488 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3490 struct TransportPlugin *plug;
3491 struct OwnAddressList *al;
3492 struct CheckHelloValidatedContext *chvc;
3494 while (neighbours != NULL)
3495 disconnect_neighbour (neighbours, GNUNET_NO);
3497 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3498 "Transport service is unloading plugins...\n");
3500 while (NULL != (plug = plugins))
3502 plugins = plug->next;
3503 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
3504 GNUNET_free (plug->lib_name);
3505 GNUNET_free (plug->short_name);
3506 while (NULL != (al = plug->addresses))
3508 plug->addresses = al->next;
3513 if (my_private_key != NULL)
3514 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3515 GNUNET_free_non_null (our_hello);
3517 /* free 'chvc' data structure */
3518 while (NULL != (chvc = chvc_head))
3520 chvc_head = chvc->next;
3521 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
3526 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3529 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3530 validation_map = NULL;
3533 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3540 * Initiate transport service.
3542 * @param cls closure
3543 * @param s scheduler to use
3544 * @param serv the initialized server
3545 * @param c configuration to use
3549 struct GNUNET_SCHEDULER_Handle *s,
3550 struct GNUNET_SERVER_Handle *serv,
3551 const struct GNUNET_CONFIGURATION_Handle *c)
3556 unsigned long long tneigh;
3561 stats = GNUNET_STATISTICS_create (sched, "transport", cfg);
3562 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
3563 /* parse configuration */
3565 GNUNET_CONFIGURATION_get_value_number (c,
3570 GNUNET_CONFIGURATION_get_value_filename (c,
3572 "HOSTKEY", &keyfile)))
3574 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3576 ("Transport service is lacking key configuration settings. Exiting.\n"));
3577 GNUNET_SCHEDULER_shutdown (s);
3580 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3583 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3584 validation_map = NULL;
3587 max_connect_per_transport = (uint32_t) tneigh;
3588 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3589 GNUNET_free (keyfile);
3590 if (my_private_key == NULL)
3592 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3594 ("Transport service could not access hostkey. Exiting.\n"));
3595 GNUNET_SCHEDULER_shutdown (s);
3598 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3601 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
3602 validation_map = NULL;
3605 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3606 GNUNET_CRYPTO_hash (&my_public_key,
3607 sizeof (my_public_key), &my_identity.hashPubKey);
3608 /* setup notification */
3610 GNUNET_SERVER_disconnect_notify (server,
3611 &client_disconnect_notification, NULL);
3612 /* load plugins... */
3615 GNUNET_CONFIGURATION_get_value_string (c,
3616 "TRANSPORT", "PLUGINS", &plugs))
3618 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3619 _("Starting transport plugins `%s'\n"), plugs);
3620 pos = strtok (plugs, " ");
3623 start_transport (server, pos);
3625 pos = strtok (NULL, " ");
3627 GNUNET_free (plugs);
3629 GNUNET_SCHEDULER_add_delayed (sched,
3630 GNUNET_TIME_UNIT_FOREVER_REL,
3631 &shutdown_task, NULL);
3636 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
3638 /* process client requests */
3639 GNUNET_SERVER_add_handlers (server, handlers);
3644 * The main function for the transport service.
3646 * @param argc number of arguments from the command line
3647 * @param argv command line arguments
3648 * @return 0 ok, 1 on error
3651 main (int argc, char *const *argv)
3653 return (GNUNET_OK ==
3654 GNUNET_SERVICE_run (argc,
3657 GNUNET_SERVICE_OPTION_NONE,
3658 &run, NULL)) ? 0 : 1;
3661 /* end of gnunet-service-transport.c */