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.
10 GNUnet is distributed in the hope that it will be useful, but
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.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
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 * - remove AddressValidations, incorporate them into the PeerAddressLists
30 #include "gnunet_client_lib.h"
31 #include "gnunet_constants.h"
32 #include "gnunet_getopt_lib.h"
33 #include "gnunet_hello_lib.h"
34 #include "gnunet_os_lib.h"
35 #include "gnunet_peerinfo_service.h"
36 #include "gnunet_plugin_lib.h"
37 #include "gnunet_protocols.h"
38 #include "gnunet_service_lib.h"
39 #include "gnunet_signatures.h"
40 #include "plugin_transport.h"
41 #include "transport.h"
44 * How many messages can we have pending for a given client process
45 * before we start to drop incoming messages? We typically should
46 * have only one client and so this would be the primary buffer for
47 * messages, so the number should be chosen rather generously.
49 * The expectation here is that most of the time the queue is large
50 * enough so that a drop is virtually never required.
52 #define MAX_PENDING 128
55 * How often should we try to reconnect to a peer using a particular
56 * transport plugin before giving up? Note that the plugin may be
57 * added back to the list after PLUGIN_RETRY_FREQUENCY expires.
59 #define MAX_CONNECT_RETRY 3
62 * How often must a peer violate bandwidth quotas before we start
63 * to simply drop its messages?
65 #define QUOTA_VIOLATION_DROP_THRESHOLD 100
68 * How long until a HELLO verification attempt should time out?
69 * Must be rather small, otherwise a partially successful HELLO
70 * validation (some addresses working) might not be available
71 * before a client's request for a connection fails for good.
72 * Besides, if a single request to an address takes a long time,
73 * then the peer is unlikely worthwhile anyway.
75 #define HELLO_VERIFICATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
78 * How long will we allow sending of a ping to be delayed?
80 #define TRANSPORT_DEFAULT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
82 #define TRANSPORT_DEFAULT_PRIORITY 4 /* Tired of remembering arbitrary priority names */
85 * How often do we re-add (cheaper) plugins to our list of plugins
86 * to try for a given connected peer?
88 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
91 * After how long do we expire an address in a HELLO
92 * that we just validated? This value is also used
93 * for our own addresses when we create a HELLO.
95 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
99 * List of addresses of other peers
101 struct PeerAddressList
104 * This is a linked list.
106 struct PeerAddressList *next;
109 * Pointer to the validation associated with this
110 * address. May be NULL if already validated!
112 struct ValidationAddress *validation;
115 * Which of our transport plugins does this entry
118 struct TransportPlugin *plugin;
121 * Neighbor this entry belongs to.
123 struct NeighborList *neighbor;
126 * Ready list (transport) that this peer belongs to
128 struct ReadyList *ready_list;
130 * How long until we auto-expire this address (unless it is
131 * re-confirmed by the transport)?
133 struct GNUNET_TIME_Absolute expires;
146 * Is this plugin ready to transmit to the specific target?
147 * GNUNET_NO if not. Initially, all plugins are marked ready. If a
148 * transmission is in progress, "transmit_ready" is set to
154 * What was the last latency observed for this plugin
155 * and peer? Invalid if connected is GNUNET_NO.
157 struct GNUNET_TIME_Relative latency;
160 * If we did not successfully transmit a message to the given peer
161 * via this connection during the specified time, we should consider
162 * the connection to be dead. This is used in the case that a TCP
163 * transport simply stalls writing to the stream but does not
164 * formerly get a signal that the other peer died.
166 struct GNUNET_TIME_Absolute timeout;
169 * Is this plugin currently connected? The first time
170 * we transmit or send data to a peer via a particular
171 * plugin, we set this to GNUNET_YES. If we later get
172 * an error (disconnect notification or transmission
173 * failure), we set it back to GNUNET_NO. Each time the
174 * value is set to GNUNET_YES, we increment the
175 * "connect_attempts" counter. If that one reaches a
176 * particular threshold, we consider the plugin to not
177 * be working properly at this time for the given peer
178 * and remove it from the eligible list.
183 * How often have we tried to connect using this plugin?
185 unsigned int connect_attempts;
191 * Entry in linked list of network addresses.
196 * This is a linked list.
198 struct AddressList *next;
201 * The address, actually a pointer to the end
202 * of this struct. Do not free!
207 * How long until we auto-expire this address (unless it is
208 * re-confirmed by the transport)?
210 struct GNUNET_TIME_Absolute expires;
221 * Entry in linked list of all of our plugins.
223 struct TransportPlugin
227 * This is a linked list.
229 struct TransportPlugin *next;
232 * API of the transport as returned by the plugin's
233 * initialization function.
235 struct GNUNET_TRANSPORT_PluginFunctions *api;
238 * Short name for the plugin (i.e. "tcp").
243 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
248 * List of our known addresses for this transport.
250 struct AddressList *addresses;
253 * Environment this transport service is using
256 struct GNUNET_TRANSPORT_PluginEnvironment env;
259 * ID of task that is used to clean up expired addresses.
261 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
265 * Set to GNUNET_YES if we need to scrap the existing
266 * list of "addresses" and start fresh when we receive
267 * the next address update from a transport. Set to
268 * GNUNET_NO if we should just add the new address
269 * to the list and wait for the commit call.
277 * For each neighbor we keep a list of messages
278 * that we still want to transmit to the neighbor.
284 * This is a linked list.
286 struct MessageQueue *next;
289 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
290 * stuck together in memory.
295 * Size of the message buf
297 size_t message_buf_size;
300 * Client responsible for queueing the message;
301 * used to check that a client has no two messages
302 * pending for the same target. Can be NULL.
304 struct TransportClient *client;
307 * Neighbor this entry belongs to.
309 /*struct NeighborList *neighbor;*/
312 * Peer ID of the Neighbor this entry belongs to.
314 struct GNUNET_PeerIdentity *neighbor_id;
317 * Plugin that we used for the transmission.
318 * NULL until we scheduled a transmission.
320 struct TransportPlugin *plugin;
323 * Internal message of the transport system that should not be
324 * included in the usual SEND-SEND_OK transmission confirmation
325 * traffic management scheme. Typically, "internal_msg" will
326 * be set whenever "client" is NULL (but it is not strictly
332 * How important is the message?
334 unsigned int priority;
337 * Using which specific address should we send this message?
339 struct PeerAddressList *specific_peer;
345 * For a given Neighbor, which plugins are available
346 * to talk to this peer and what are their costs?
351 * This is a linked list.
353 struct ReadyList *next;
356 * Which of our transport plugins does this entry
359 struct TransportPlugin *plugin;
362 * Neighbor this entry belongs to.
364 struct NeighborList *neighbor;
367 * Transport addresses, latency, and readiness for
368 * this particular plugin.
370 struct PeerAddressList *addresses;
373 * Is this plugin ready to transmit to the specific target?
374 * GNUNET_NO if not. Initially, all plugins are marked ready. If a
375 * transmission is in progress, "transmit_ready" is set to
378 int plugin_transmit_ready;
381 * Are any of our PeerAddressList addresses still connected?
383 int connected; /* FIXME: dynamically check PeerAddressList addresses when asked to! */
388 * Entry in linked list of all of our current neighbors.
394 * This is a linked list.
396 struct NeighborList *next;
399 * Which of our transports is connected to this peer
400 * and what is their status?
402 struct ReadyList *plugins;
405 * List of messages we would like to send to this peer;
406 * must contain at most one message per client.
408 struct MessageQueue *messages;
411 * Identity of this neighbor.
413 struct GNUNET_PeerIdentity id;
416 * ID of task scheduled to run when this peer is about to
417 * time out (will free resources associated with the peer).
419 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
422 * How long until we should consider this peer dead
423 * (if we don't receive another message in the
426 struct GNUNET_TIME_Absolute peer_timeout;
429 * At what time did we reset last_received last?
431 struct GNUNET_TIME_Absolute last_quota_update;
434 * At what time should we try to again add plugins to
437 struct GNUNET_TIME_Absolute retry_plugins_time;
440 * How many bytes have we received since the "last_quota_update"
443 uint64_t last_received;
446 * Global quota for inbound traffic for the neighbor in bytes/ms.
451 * How often has the other peer (recently) violated the
452 * inbound traffic limit? Incremented by 10 per violation,
453 * decremented by 1 per non-violation (for each
456 unsigned int quota_violation_count;
459 * Have we seen an ACK from this neighbor in the past?
460 * (used to make up a fake ACK for clients connecting after
461 * the neighbor connected to us).
465 /* The latency we have seen for this particular address for
466 * this particular peer. This latency may have been calculated
467 * over multiple transports. This value reflects how long it took
468 * us to receive a response when SENDING via this particular
469 * transport/neighbor/address combination!
471 struct GNUNET_TIME_RelativeNBO latency;
476 * Message used to ask a peer to validate receipt (to check an address
477 * from a HELLO). Followed by the address used. Note that the
478 * recipients response does not affirm that he has this address,
479 * only that he got the challenge message.
481 struct TransportPingMessage
485 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
487 struct GNUNET_MessageHeader header;
490 * Random challenge number (in network byte order).
492 uint32_t challenge GNUNET_PACKED;
495 * Who is the intended recipient?
497 struct GNUNET_PeerIdentity target;
503 * Message used to validate a HELLO. The challenge is included in the
504 * confirmation to make matching of replies to requests possible. The
505 * signature signs the original challenge number, our public key, the
506 * sender's address (so that the sender can check that the address we
507 * saw is plausible for him and possibly detect a MiM attack) and a
508 * timestamp (to limit replay).<p>
510 * This message is followed by the address of the
511 * client that we are observing (which is part of what
514 struct TransportPongMessage
518 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
520 struct GNUNET_MessageHeader header;
523 * For padding, always zero.
525 uint32_t reserved GNUNET_PACKED;
530 struct GNUNET_CRYPTO_RsaSignature signature;
533 * What are we signing and why?
535 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
538 * Random challenge number (in network byte order).
540 uint32_t challenge GNUNET_PACKED;
543 * Who signed this message?
545 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded signer;
548 * Size of address appended to this message
555 * Linked list of messages to be transmitted to
556 * the client. Each entry is followed by the
559 struct ClientMessageQueueEntry
562 * This is a linked list.
564 struct ClientMessageQueueEntry *next;
569 * Client connected to the transport service.
571 struct TransportClient
575 * This is a linked list.
577 struct TransportClient *next;
580 * Handle to the client.
582 struct GNUNET_SERVER_Client *client;
585 * Linked list of messages yet to be transmitted to
588 struct ClientMessageQueueEntry *message_queue_head;
591 * Tail of linked list of messages yet to be transmitted to the
594 struct ClientMessageQueueEntry *message_queue_tail;
597 * Is a call to "transmit_send_continuation" pending? If so, we
598 * must not free this struct (even if the corresponding client
599 * disconnects) and instead only remove it from the linked list and
600 * set the "client" field to NULL.
605 * Length of the list of messages pending for this client.
607 unsigned int message_count;
613 * For each HELLO, we may have to validate multiple addresses;
614 * each address gets its own request entry.
616 struct ValidationAddress
619 * This is a linked list.
621 struct ValidationAddress *next;
624 * What peer_address does this validation belong to?
626 struct PeerAddressList *peer_address;
629 * Name of the transport.
631 char *transport_name;
634 * When should this validated address expire?
636 struct GNUNET_TIME_Absolute expiration;
639 * At what time did we send this validation?
641 struct GNUNET_TIME_Absolute send_time;
644 * Challenge number we used.
649 * Set to GNUNET_YES if the challenge was met,
650 * GNUNET_SYSERR if we know it failed, GNUNET_NO
651 * if we are waiting on a response.
658 * Entry in linked list of all HELLOs awaiting validation.
660 struct ValidationList
664 * This is a linked list.
666 struct ValidationList *next;
669 * Linked list with one entry per address from the HELLO
670 * that needs to be validated.
672 struct ValidationAddress *addresses;
675 * The public key of the peer.
677 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
680 * When does this record time-out? (assuming the
681 * challenge goes unanswered)
683 struct GNUNET_TIME_Absolute timeout;
688 struct CheckHelloValidatedContext
691 * Plugin for which we are validating.
693 struct TransportPlugin *plugin;
696 * Hello that we are validating.
698 struct GNUNET_HELLO_Message *hello;
701 * Validation list being built.
703 struct ValidationList *e;
706 * Context for peerinfo iteration.
707 * NULL after we are done processing peerinfo's information.
709 struct GNUNET_PEERINFO_IteratorContext *piter;
716 * HELLOs awaiting validation.
718 static struct ValidationList *pending_validations;
723 static struct GNUNET_HELLO_Message *our_hello;
726 * "version" of "our_hello". Used to see if a given
727 * neighbor has already been sent the latest version
728 * of our HELLO message.
730 static unsigned int our_hello_version;
735 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
740 static struct GNUNET_PeerIdentity my_identity;
745 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
750 struct GNUNET_SCHEDULER_Handle *sched;
755 const struct GNUNET_CONFIGURATION_Handle *cfg;
758 * Linked list of all clients to this service.
760 static struct TransportClient *clients;
763 * All loaded plugins.
765 static struct TransportPlugin *plugins;
770 static struct GNUNET_SERVER_Handle *server;
773 * All known neighbors and their HELLOs.
775 static struct NeighborList *neighbors;
778 * Number of neighbors we'd like to have.
780 static uint32_t max_connect_per_transport;
783 * The peer specified by the given neighbor has timed-out or a plugin
784 * has disconnected. We may either need to do nothing (other plugins
785 * still up), or trigger a full disconnect and clean up. This
786 * function updates our state and do the necessary notifications.
787 * Also notifies our clients that the neighbor is now officially
790 * @param n the neighbor list entry for the peer
791 * @param check should we just check if all plugins
792 * disconnected or must we ask all plugins to
795 static void disconnect_neighbor (struct NeighborList *n, int check);
799 * Check the ready list for the given neighbor and
800 * if a plugin is ready for transmission (and if we
801 * have a message), do so!
803 * @param neighbor target peer for which to check the plugins
805 static ssize_t try_transmission_to_peer (struct NeighborList *neighbor);
809 * Find an entry in the neighbor list for a particular peer.
810 * if sender_address is not specified (NULL) then return the
811 * first matching entry. If sender_address is specified, then
812 * make sure that the address and address_len also matches.
814 * @return NULL if not found.
816 static struct NeighborList *
817 find_neighbor (const struct GNUNET_PeerIdentity *key)
819 struct NeighborList *head = neighbors;
821 while ((head != NULL) &&
822 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
830 * Find an entry in the transport list for a particular transport.
832 * @return NULL if not found.
834 static struct TransportPlugin *
835 find_transport (const char *short_name)
837 struct TransportPlugin *head = plugins;
838 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
845 * Update the quota values for the given neighbor now.
848 update_quota (struct NeighborList *n)
850 struct GNUNET_TIME_Relative delta;
854 delta = GNUNET_TIME_absolute_get_duration (n->last_quota_update);
855 if (delta.value < MIN_QUOTA_REFRESH_TIME)
856 return; /* not enough time passed for doing quota update */
857 allowed = delta.value * n->quota_in;
858 if (n->last_received < allowed)
860 remaining = allowed - n->last_received;
862 remaining /= n->quota_in;
865 if (remaining > MAX_BANDWIDTH_CARRY)
866 remaining = MAX_BANDWIDTH_CARRY;
867 n->last_received = 0;
868 n->last_quota_update = GNUNET_TIME_absolute_get ();
869 n->last_quota_update.value -= remaining;
870 if (n->quota_violation_count > 0)
871 n->quota_violation_count--;
875 n->last_received -= allowed;
876 n->last_quota_update = GNUNET_TIME_absolute_get ();
877 if (n->last_received > allowed)
879 /* more than twice the allowed rate! */
880 n->quota_violation_count += 10;
887 * Function called to notify a client about the socket
888 * being ready to queue more data. "buf" will be
889 * NULL and "size" zero if the socket was closed for
890 * writing in the meantime.
893 * @param size number of bytes available in buf
894 * @param buf where the callee should write the message
895 * @return number of bytes written to buf
898 transmit_to_client_callback (void *cls, size_t size, void *buf)
900 struct TransportClient *client = cls;
901 struct ClientMessageQueueEntry *q;
904 const struct GNUNET_MessageHeader *msg;
905 struct GNUNET_CONNECTION_TransmitHandle *th;
910 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
911 "Transmission to client failed, closing connection.\n");
912 /* fatal error with client, free message queue! */
913 while (NULL != (q = client->message_queue_head))
915 client->message_queue_head = q->next;
918 client->message_queue_tail = NULL;
919 client->message_count = 0;
924 while (NULL != (q = client->message_queue_head))
926 msg = (const struct GNUNET_MessageHeader *) &q[1];
927 msize = ntohs (msg->size);
928 if (msize + tsize > size)
931 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
932 "Transmitting message of type %u to client.\n",
935 client->message_queue_head = q->next;
937 client->message_queue_tail = NULL;
938 memcpy (&cbuf[tsize], msg, msize);
941 client->message_count--;
945 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
946 th = GNUNET_SERVER_notify_transmit_ready (client->client,
948 GNUNET_TIME_UNIT_FOREVER_REL,
949 &transmit_to_client_callback,
951 GNUNET_assert (th != NULL);
958 * Send the specified message to the specified client. Since multiple
959 * messages may be pending for the same client at a time, this code
960 * makes sure that no message is lost.
962 * @param client client to transmit the message to
963 * @param msg the message to send
964 * @param may_drop can this message be dropped if the
965 * message queue for this client is getting far too large?
968 transmit_to_client (struct TransportClient *client,
969 const struct GNUNET_MessageHeader *msg, int may_drop)
971 struct ClientMessageQueueEntry *q;
973 struct GNUNET_CONNECTION_TransmitHandle *th;
975 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
977 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
979 ("Dropping message, have %u messages pending (%u is the soft limit)\n"),
980 client->message_count, MAX_PENDING);
981 /* TODO: call to statistics... */
984 client->message_count++;
985 msize = ntohs (msg->size);
986 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
987 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
988 memcpy (&q[1], msg, msize);
989 /* append to message queue */
990 if (client->message_queue_tail == NULL)
992 client->message_queue_tail = q;
996 client->message_queue_tail->next = q;
997 client->message_queue_tail = q;
999 if (client->message_queue_head == NULL)
1001 client->message_queue_head = q;
1002 th = GNUNET_SERVER_notify_transmit_ready (client->client,
1004 GNUNET_TIME_UNIT_FOREVER_REL,
1005 &transmit_to_client_callback,
1007 GNUNET_assert (th != NULL);
1013 * Find alternative plugins for communication.
1015 * @param neighbor for which neighbor should we try to find
1019 try_alternative_plugins (struct NeighborList *neighbor)
1021 struct ReadyList *rl;
1023 if ((neighbor->plugins != NULL) &&
1024 (neighbor->retry_plugins_time.value >
1025 GNUNET_TIME_absolute_get ().value))
1026 return; /* don't try right now */
1027 neighbor->retry_plugins_time
1028 = GNUNET_TIME_relative_to_absolute (PLUGIN_RETRY_FREQUENCY);
1030 rl = neighbor->plugins;
1031 #if WTF /* FIXME: What is this supposed to do? */
1034 if (rl->connect_attempts > 0)
1035 rl->connect_attempts--; /* amnesty */
1043 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1044 * upon "completion" of a send request. This tells the API
1045 * that it is now legal to send another message to the given
1048 * @param cls closure, identifies the entry on the
1049 * message queue that was transmitted and the
1050 * client responsible for queueing the message
1051 * @param target the peer receiving the message
1052 * @param result GNUNET_OK on success, if the transmission
1053 * failed, we should not tell the client to transmit
1057 transmit_send_continuation (void *cls,
1058 const struct GNUNET_PeerIdentity *target,
1061 struct MessageQueue *mq = cls;
1062 /*struct ReadyList *rl;*/ /* We no longer use the ReadyList for anything here, safe to remove? */
1063 struct SendOkMessage send_ok_msg;
1064 struct NeighborList *n;
1066 GNUNET_assert (mq != NULL);
1067 n = find_neighbor(mq->neighbor_id);
1068 if (n == NULL) /* Neighbor must have been removed asynchronously! */
1071 /* Otherwise, let's make sure we've got the right peer */
1073 memcmp (&n->id, target,
1074 sizeof (struct GNUNET_PeerIdentity)));
1076 if (result == GNUNET_OK)
1078 mq->specific_peer->timeout =
1079 GNUNET_TIME_relative_to_absolute
1080 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1084 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1085 "Transmission to peer `%s' failed, marking connection as down.\n",
1086 GNUNET_i2s (target));
1087 mq->specific_peer->connected = GNUNET_NO;
1089 if (!mq->internal_msg)
1092 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1093 "Setting transmit_ready on transport!\n");
1095 mq->specific_peer->transmit_ready = GNUNET_YES;
1098 if (mq->client != NULL)
1100 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1101 "Notifying client %p about transmission to peer `%4s'.\n",
1102 mq->client, GNUNET_i2s (target));
1103 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1104 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1105 send_ok_msg.success = htonl (result);
1106 send_ok_msg.peer = n->id;
1107 transmit_to_client (mq->client, &send_ok_msg.header, GNUNET_NO);
1109 GNUNET_free (mq->message_buf);
1111 /* one plugin just became ready again, try transmitting
1112 another message (if available) */
1113 if (result == GNUNET_OK)
1114 try_transmission_to_peer (n);
1116 disconnect_neighbor (n, GNUNET_YES);
1122 struct PeerAddressList *
1123 find_ready_address(struct NeighborList *neighbor)
1125 struct ReadyList *head = neighbor->plugins;
1126 struct PeerAddressList *addresses;
1127 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1128 struct GNUNET_TIME_Relative min_latency = GNUNET_TIME_relative_get_forever();
1129 struct PeerAddressList *best_address;
1131 best_address = NULL;
1132 while (head != NULL)
1134 addresses = head->addresses;
1136 while (addresses != NULL)
1138 if ((addresses->timeout.value < now.value) && (addresses->connected == GNUNET_YES))
1141 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1142 "Marking long-time inactive connection to `%4s' as down.\n",
1143 GNUNET_i2s (&addresses->ready_list->neighbor->id));
1145 addresses->connected = GNUNET_NO;
1147 addresses = addresses->next;
1150 addresses = head->addresses;
1151 while (addresses != NULL)
1153 if ((addresses->connected == GNUNET_YES) &&
1154 (addresses->transmit_ready == GNUNET_YES) &&
1155 ((addresses->latency.value < min_latency.value) || (best_address == NULL)))
1158 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1159 "Found address with latency %llu, setting as best found yet!\n",
1160 addresses->latency.value);
1162 best_address = addresses;
1164 addresses = addresses->next;
1169 if (best_address != NULL)
1171 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1172 "Best address found has latency of %llu!\n",
1173 best_address->latency.value);
1176 return best_address;
1181 * Check the ready list for the given neighbor and
1182 * if a plugin is ready for transmission (and if we
1183 * have a message), do so!
1186 try_transmission_to_peer (struct NeighborList *neighbor)
1188 struct GNUNET_TIME_Relative min_latency;
1189 struct ReadyList *rl;
1190 struct MessageQueue *mq;
1191 struct GNUNET_TIME_Absolute now;
1193 if (neighbor->messages == NULL)
1194 return 0; /* nothing to do */
1195 try_alternative_plugins (neighbor);
1196 min_latency = GNUNET_TIME_UNIT_FOREVER_REL;
1198 mq = neighbor->messages;
1199 now = GNUNET_TIME_absolute_get ();
1201 if (mq->specific_peer == NULL)
1202 mq->specific_peer = find_ready_address(neighbor); /* Find first available (or best!) address to transmit to */
1204 if (mq->specific_peer == NULL)
1207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1208 "No plugin ready to transmit message\n");
1210 return 0; /* nobody ready */
1213 rl = mq->specific_peer->ready_list;
1214 neighbor->messages = mq->next;
1215 mq->plugin = rl->plugin;
1216 if (!mq->internal_msg)
1217 mq->specific_peer->transmit_ready = GNUNET_NO;
1219 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1220 "Giving message of size `%u' for `%4s' to plugin `%s'\n",
1221 mq->message_buf_size,
1222 GNUNET_i2s (&neighbor->id), rl->plugin->short_name);
1225 return rl->plugin->api->send (rl->plugin->api->cls,
1228 mq->message_buf_size,
1230 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1231 mq->specific_peer->addr,
1232 mq->specific_peer->addrlen,
1234 &transmit_send_continuation, mq);
1240 * Send the specified message to the specified peer.
1242 * @param client source of the transmission request (can be NULL)
1243 * @param peer_address PeerAddressList where we should send this message
1244 * @param priority how important is the message
1245 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1246 * @param message_buf_size total size of all messages in message_buf
1247 * @param is_internal is this an internal message
1248 * @param neighbor handle to the neighbor for transmission
1251 transmit_to_peer (struct TransportClient *client,
1252 struct PeerAddressList *peer_address,
1253 unsigned int priority,
1254 const char *message_buf,
1255 size_t message_buf_size,
1256 int is_internal, struct NeighborList *neighbor)
1258 struct MessageQueue *mq;
1259 struct MessageQueue *mqe;
1264 /* check for duplicate submission */
1265 mq = neighbor->messages;
1268 if (mq->client == client)
1270 /* client transmitted to same peer twice
1271 before getting SendOk! */
1278 mq = GNUNET_malloc (sizeof (struct MessageQueue));
1279 mq->specific_peer = peer_address;
1280 mq->client = client;
1281 m = GNUNET_malloc (message_buf_size);
1282 memcpy (m, message_buf, message_buf_size);
1283 mq->message_buf = m;
1284 mq->message_buf_size = message_buf_size;
1285 mq->neighbor_id = GNUNET_malloc(sizeof (struct GNUNET_PeerIdentity));
1287 memcpy(mq->neighbor_id, &neighbor->id, sizeof(struct GNUNET_PeerIdentity));
1288 mq->internal_msg = is_internal;
1289 mq->priority = priority;
1292 mqe = neighbor->messages;
1294 while (mqe->next != NULL)
1299 neighbor->messages = mq;
1306 return try_transmission_to_peer (neighbor);
1313 struct GeneratorContext
1315 struct TransportPlugin *plug_pos;
1316 struct AddressList *addr_pos;
1317 struct GNUNET_TIME_Absolute expiration;
1325 address_generator (void *cls, size_t max, void *buf)
1327 struct GeneratorContext *gc = cls;
1330 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1332 gc->plug_pos = gc->plug_pos->next;
1333 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1335 if (NULL == gc->plug_pos)
1340 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1343 gc->addr_pos->addrlen, buf, max);
1344 gc->addr_pos = gc->addr_pos->next;
1350 * Construct our HELLO message from all of the addresses of
1351 * all of the transports.
1356 struct GNUNET_HELLO_Message *hello;
1357 struct TransportClient *cpos;
1358 struct NeighborList *npos;
1359 struct GeneratorContext gc;
1361 gc.plug_pos = plugins;
1362 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1363 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1364 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1366 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1367 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1370 while (cpos != NULL)
1372 transmit_to_client (cpos,
1373 (const struct GNUNET_MessageHeader *) hello,
1378 GNUNET_free_non_null (our_hello);
1380 our_hello_version++;
1381 GNUNET_PEERINFO_add_peer (cfg, sched, &my_identity, our_hello);
1383 while (npos != NULL)
1386 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1387 "Transmitting updated `%s' to neighbor `%4s'\n",
1388 "HELLO", GNUNET_i2s (&npos->id));
1389 #endif // FIXME: just testing
1390 //transmit_to_peer (NULL, NULL, 0,
1391 // (const char *) our_hello, GNUNET_HELLO_size(our_hello),
1392 // GNUNET_YES, npos);
1399 * Task used to clean up expired addresses for a plugin.
1401 * @param cls closure
1405 expire_address_task (void *cls,
1406 const struct GNUNET_SCHEDULER_TaskContext *tc);
1410 * Update the list of addresses for this plugin,
1411 * expiring those that are past their expiration date.
1413 * @param plugin addresses of which plugin should be recomputed?
1414 * @param fresh set to GNUNET_YES if a new address was added
1415 * and we need to regenerate the HELLO even if nobody
1419 update_addresses (struct TransportPlugin *plugin, int fresh)
1421 struct GNUNET_TIME_Relative min_remaining;
1422 struct GNUNET_TIME_Relative remaining;
1423 struct GNUNET_TIME_Absolute now;
1424 struct AddressList *pos;
1425 struct AddressList *prev;
1426 struct AddressList *next;
1429 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1430 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1431 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1432 now = GNUNET_TIME_absolute_get ();
1433 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1434 expired = GNUNET_NO;
1436 pos = plugin->addresses;
1440 if (pos->expires.value < now.value)
1442 expired = GNUNET_YES;
1444 plugin->addresses = pos->next;
1446 prev->next = pos->next;
1451 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1452 if (remaining.value < min_remaining.value)
1453 min_remaining = remaining;
1459 if (expired || fresh)
1461 if (min_remaining.value < GNUNET_TIME_UNIT_FOREVER_REL.value)
1462 plugin->address_update_task
1463 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1465 &expire_address_task, plugin);
1471 * Task used to clean up expired addresses for a plugin.
1473 * @param cls closure
1477 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1479 struct TransportPlugin *plugin = cls;
1480 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1481 update_addresses (plugin, GNUNET_NO);
1486 * Function that must be called by each plugin to notify the
1487 * transport service about the addresses under which the transport
1488 * provided by the plugin can be reached.
1490 * @param cls closure
1491 * @param name name of the transport that generated the address
1492 * @param addr one of the addresses of the host, NULL for the last address
1493 * the specific address format depends on the transport
1494 * @param addrlen length of the address
1495 * @param expires when should this address automatically expire?
1498 plugin_env_notify_address (void *cls,
1502 struct GNUNET_TIME_Relative expires)
1504 struct TransportPlugin *p = cls;
1505 struct AddressList *al;
1506 struct GNUNET_TIME_Absolute abex;
1508 abex = GNUNET_TIME_relative_to_absolute (expires);
1509 GNUNET_assert (p == find_transport (name));
1514 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
1516 if (al->expires.value < abex.value)
1523 al = GNUNET_malloc (sizeof (struct AddressList) + addrlen);
1525 al->next = p->addresses;
1528 al->addrlen = addrlen;
1529 memcpy (&al[1], addr, addrlen);
1530 update_addresses (p, GNUNET_YES);
1535 * Notify all of our clients about a peer connecting.
1538 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
1539 struct GNUNET_TIME_Relative latency)
1541 struct ConnectInfoMessage cim;
1542 struct TransportClient *cpos;
1544 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
1545 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
1546 cim.quota_out = htonl (GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT / (60 * 1000));
1547 cim.latency = GNUNET_TIME_relative_hton (latency);
1548 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
1550 while (cpos != NULL)
1552 transmit_to_client (cpos, &cim.header, GNUNET_NO);
1559 * Notify all of our clients about a peer disconnecting.
1562 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
1564 struct DisconnectInfoMessage dim;
1565 struct TransportClient *cpos;
1567 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
1568 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1569 dim.reserved = htonl (0);
1570 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1572 while (cpos != NULL)
1574 transmit_to_client (cpos, &dim.header, GNUNET_NO);
1581 * Copy any validated addresses to buf.
1583 * @return 0 once all addresses have been
1587 list_validated_addresses (void *cls, size_t max, void *buf)
1589 struct ValidationAddress **va = cls;
1592 while ((NULL != *va) && ((*va)->ok != GNUNET_YES))
1596 ret = GNUNET_HELLO_add_address ((*va)->transport_name,
1598 (*va)->peer_address->addr, (*va)->peer_address->addrlen, buf, max);
1605 * HELLO validation cleanup task.
1608 cleanup_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1610 struct ValidationAddress *va;
1611 struct ValidationList *pos;
1612 struct ValidationList *prev;
1613 struct GNUNET_TIME_Absolute now;
1614 struct GNUNET_TIME_Absolute first;
1615 struct GNUNET_HELLO_Message *hello;
1616 struct GNUNET_PeerIdentity pid;
1617 struct NeighborList *n;
1619 now = GNUNET_TIME_absolute_get ();
1621 pos = pending_validations;
1624 if (pos->timeout.value < now.value)
1627 pending_validations = pos->next;
1629 prev->next = pos->next;
1630 va = pos->addresses;
1631 hello = GNUNET_HELLO_create (&pos->publicKey,
1632 &list_validated_addresses, &va);
1633 GNUNET_CRYPTO_hash (&pos->publicKey,
1635 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1638 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1639 "Creating persistent `%s' message for peer `%4s' based on confirmed addresses.\n",
1640 "HELLO", GNUNET_i2s (&pid));
1642 GNUNET_PEERINFO_add_peer (cfg, sched, &pid, hello);
1643 n = find_neighbor (&pid);
1646 try_transmission_to_peer (n);
1648 GNUNET_free (hello);
1649 while (NULL != (va = pos->addresses))
1651 pos->addresses = va->next;
1652 GNUNET_free (va->transport_name);
1657 pos = pending_validations;
1666 /* finally, reschedule cleanup if needed; list is
1667 ordered by timeout, so we need the last element... */
1668 if (NULL != pending_validations)
1670 first = pending_validations->timeout;
1671 pos = pending_validations;
1674 first = GNUNET_TIME_absolute_min (first, pos->timeout);
1677 if (tc->reason != GNUNET_SCHEDULER_REASON_SHUTDOWN)
1679 GNUNET_SCHEDULER_add_delayed (sched,
1680 GNUNET_TIME_absolute_get_remaining
1681 (first), &cleanup_validation, NULL);
1688 * Function that will be called if we receive a validation
1689 * of an address challenge that we transmitted to another
1690 * peer. Note that the validation should only be considered
1691 * acceptable if the challenge matches AND if the sender
1692 * address is at least a plausible address for this peer
1693 * (otherwise we may be seeing a MiM attack).
1695 * @param cls closure
1696 * @param name name of the transport that generated the address
1697 * @param peer who responded to our challenge
1698 * @param challenge the challenge number we presumably used
1699 * @param sender_addr string describing our sender address (as observed
1700 * by the other peer in human-readable format)
1703 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
1704 const struct GNUNET_PeerIdentity *peer,
1705 const char *sender_address,
1706 size_t sender_address_len)
1708 unsigned int not_done;
1710 struct ValidationList *pos;
1711 struct ValidationAddress *va;
1712 struct GNUNET_PeerIdentity id;
1713 const struct TransportPongMessage *pong = (const struct TransportPongMessage *)message;
1715 unsigned int challenge = ntohl(pong->challenge);
1716 pos = pending_validations;
1720 GNUNET_CRYPTO_hash (&pos->publicKey,
1722 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1724 if (0 == memcmp (peer, &id, sizeof (struct GNUNET_PeerIdentity)))
1731 /* TODO: call statistics (unmatched PONG) */
1732 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1734 ("Received validation response but have no record of any validation request for `%4s' (out of %d). Ignoring.\n"),
1735 GNUNET_i2s (peer), count);
1739 matched = GNUNET_NO;
1740 va = pos->addresses;
1743 if (va->challenge == challenge)
1746 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1747 "Confirmed validity of address, peer `%4s' has address `%s'.\n",
1749 GNUNET_a2s ((const struct sockaddr *) sender_address,
1750 sender_address_len));
1752 GNUNET_log (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
1754 ("Another peer saw us using the address `%s' via `%s'. If this is not plausible, this address should be listed in the configuration as implausible to avoid MiM attacks.\n"),
1755 GNUNET_a2s ((const struct sockaddr *) &pong[1],
1756 ntohs(pong->addrlen)), va->transport_name);
1757 va->ok = GNUNET_YES;
1759 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1760 matched = GNUNET_YES;
1761 va->peer_address->connected = GNUNET_YES;
1762 va->peer_address->latency = GNUNET_TIME_absolute_get_difference(va->peer_address->validation->send_time, GNUNET_TIME_absolute_get());
1764 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1765 "Confirmed validity of address, peer `%4s' has address `%s', latency of %llu\n",
1767 GNUNET_a2s ((const struct sockaddr *) sender_address,
1768 sender_address_len), (unsigned long long)va->peer_address->latency.value);
1770 va->peer_address->transmit_ready = GNUNET_YES;
1771 va->peer_address->expires = GNUNET_TIME_relative_to_absolute
1772 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1774 if (va->ok != GNUNET_YES)
1778 if (GNUNET_NO == matched)
1780 /* TODO: call statistics (unmatched PONG) */
1781 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1783 ("Received `%s' message but have no record of a matching `%s' message. Ignoring.\n"),
1789 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1790 "All addresses validated, will now construct `%s' for `%4s'.\n",
1791 "HELLO", GNUNET_i2s (peer));
1793 pos->timeout.value = 0;
1794 GNUNET_SCHEDULER_add_with_priority (sched,
1795 GNUNET_SCHEDULER_PRIORITY_IDLE,
1796 &cleanup_validation, NULL);
1802 * Add an entry for each of our transport plugins
1803 * (that are able to send) to the list of plugins
1804 * for this neighbor.
1806 * @param neighbor to initialize
1809 add_plugins (struct NeighborList *neighbor)
1811 struct TransportPlugin *tp;
1812 struct ReadyList *rl;
1814 neighbor->retry_plugins_time
1815 = GNUNET_TIME_relative_to_absolute (PLUGIN_RETRY_FREQUENCY);
1819 if (tp->api->send != NULL)
1821 rl = GNUNET_malloc (sizeof (struct ReadyList));
1822 rl->next = neighbor->plugins;
1823 neighbor->plugins = rl;
1825 rl->neighbor = neighbor;
1826 rl->addresses = NULL;
1833 neighbor_timeout_task (void *cls,
1834 const struct GNUNET_SCHEDULER_TaskContext *tc)
1836 struct NeighborList *n = cls;
1839 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1840 "Neighbor `%4s' has timed out!\n", GNUNET_i2s (&n->id));
1842 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1843 disconnect_neighbor (n, GNUNET_NO);
1847 * Create a fresh entry in our neighbor list for the given peer.
1848 * Will try to transmit our current HELLO to the new neighbor. Also
1849 * notifies our clients about the new "connection".
1851 * @param peer the peer for which we create the entry
1852 * @return the new neighbor list entry
1854 static struct NeighborList *
1855 setup_new_neighbor (const struct GNUNET_PeerIdentity *peer)
1857 struct NeighborList *n;
1859 GNUNET_assert (our_hello != NULL);
1860 n = GNUNET_malloc (sizeof (struct NeighborList));
1861 n->next = neighbors;
1864 n->last_quota_update = GNUNET_TIME_absolute_get ();
1866 GNUNET_TIME_relative_to_absolute
1867 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1868 n->quota_in = (GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT + 59999) / (60 * 1000);
1870 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
1871 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1872 &neighbor_timeout_task, n);
1873 transmit_to_peer (NULL, NULL, 0,
1874 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
1876 notify_clients_connect (peer, GNUNET_TIME_UNIT_FOREVER_REL);
1880 static struct PeerAddressList *
1881 add_peer_address(struct NeighborList *neighbor, const char *addr, size_t addrlen)
1883 /* FIXME: should return a list of PeerAddressLists, support for multiple transports! */
1884 struct ReadyList *head = neighbor->plugins;
1885 struct PeerAddressList * new_address;
1887 GNUNET_assert(addr != NULL);
1890 while (head != NULL)
1892 new_address = GNUNET_malloc(sizeof(struct PeerAddressList));
1893 new_address->addr = GNUNET_malloc(addrlen);
1894 memcpy(new_address->addr, addr, addrlen);
1895 new_address->addrlen = addrlen;
1896 new_address->connect_attempts = 0;
1897 new_address->connected = GNUNET_YES; /* Set connected to GNUNET_YES, assuming that we're good */
1898 new_address->expires = GNUNET_TIME_relative_to_absolute
1899 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1900 new_address->latency = GNUNET_TIME_relative_get_forever();
1901 new_address->neighbor = neighbor;
1902 new_address->plugin = head->plugin;
1903 new_address->transmit_ready = GNUNET_YES;
1904 new_address->timeout = GNUNET_TIME_relative_to_absolute
1905 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT); /* FIXME: Do we need this? */
1906 new_address->ready_list = head;
1907 new_address->next = head->addresses;
1908 head->addresses = new_address;
1915 static struct PeerAddressList *
1916 find_peer_address(struct NeighborList *neighbor, const char *addr, size_t addrlen)
1918 struct ReadyList *head = neighbor->plugins;
1919 struct PeerAddressList *address_head;
1920 while (head != NULL)
1922 address_head = head->addresses;
1923 while ((address_head != NULL) &&
1924 (address_head->addrlen != addrlen) &&
1925 (memcmp(address_head->addr, addr, addrlen) != 0))
1927 address_head = address_head->next;
1929 if (address_head != NULL)
1930 return address_head;
1938 * Append the given address to the list of entries
1939 * that need to be validated.
1942 run_validation (void *cls,
1944 struct GNUNET_TIME_Absolute expiration,
1945 const void *addr, size_t addrlen)
1947 struct ValidationList *e = cls;
1948 struct TransportPlugin *tp;
1949 struct ValidationAddress *va;
1950 struct GNUNET_PeerIdentity id;
1951 struct NeighborList *neighbor;
1952 struct PeerAddressList *peer_address;
1954 struct TransportPingMessage *ping;
1959 tp = find_transport (tname);
1962 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
1963 GNUNET_ERROR_TYPE_BULK,
1965 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
1969 GNUNET_CRYPTO_hash (&e->publicKey,
1971 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1975 "Scheduling validation of address `%s' via `%s' for `%4s'\n",
1976 GNUNET_a2s (addr, addrlen), tname, GNUNET_i2s (&id));
1978 va = GNUNET_malloc (sizeof (struct ValidationAddress));
1979 va->next = e->addresses;
1981 va->transport_name = GNUNET_strdup (tname);
1982 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1984 va->send_time = GNUNET_TIME_absolute_get();
1986 neighbor = find_neighbor(&id);
1988 if (neighbor == NULL)
1989 neighbor = setup_new_neighbor(&id);
1991 peer_address = find_peer_address(neighbor, addr, addrlen);
1992 if (peer_address == NULL)
1994 peer_address = add_peer_address(neighbor, addr, addrlen);
1997 GNUNET_assert(peer_address != NULL);
1999 va->peer_address = peer_address; /* Back pointer FIXME: remove this nonsense! */
2000 peer_address->validation = va;
2002 hello_size = GNUNET_HELLO_size(our_hello);
2003 tsize = sizeof(struct TransportPingMessage) + hello_size;
2005 message_buf = GNUNET_malloc(tsize);
2007 ping = GNUNET_malloc(sizeof(struct TransportPingMessage));
2008 ping->challenge = htonl(va->challenge);
2009 ping->header.size = htons(sizeof(struct TransportPingMessage));
2010 ping->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
2011 memcpy(&ping->target, &id, sizeof(struct GNUNET_PeerIdentity));
2014 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "hello size is %d, ping size is %d, total size is %d", hello_size, sizeof(struct TransportPingMessage), tsize);
2016 memcpy(message_buf, our_hello, hello_size);
2017 memcpy(&message_buf[hello_size], ping, sizeof(struct TransportPingMessage));
2020 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending ping message of size %d to address `%s' via `%s' for `%4s'\n",
2021 tsize, GNUNET_a2s (addr, addrlen), tname, GNUNET_i2s (&id));
2023 sent = transmit_to_peer(NULL, peer_address, GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2024 message_buf, tsize, GNUNET_NO, neighbor);
2027 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transport returned %d from send!\n", sent);
2031 GNUNET_free(message_buf);
2037 * @param cls handle to the plugin (for sending)
2038 * @param target the peer identity of the peer we are sending to
2039 * @param challenge the challenge number
2040 * @param timeout how long to await validation?
2041 * @param addr the address to validate
2042 * @param addrlen the length of the address
2044 * Perform address validation, which means sending a PING PONG to
2045 * the address via the transport plugin. If not validated, then
2046 * do not count this as a good peer/address...
2048 * Currently this function is not used, ping/pongs get sent from the
2049 * run_validation function. Haven't decided yet how to do this.
2052 validate_address (void *cls, struct ValidationAddress *va,
2053 const struct GNUNET_PeerIdentity *target,
2054 struct GNUNET_TIME_Relative timeout,
2055 const void *addr, size_t addrlen)
2057 /* struct Plugin *plugin = cls;
2058 int challenge = va->challenge; */
2066 * Check if addresses in validated hello "h" overlap with
2067 * those in "chvc->hello" and update "chvc->hello" accordingly,
2068 * removing those addresses that have already been validated.
2071 check_hello_validated (void *cls,
2072 const struct GNUNET_PeerIdentity *peer,
2073 const struct GNUNET_HELLO_Message *h, uint32_t trust)
2075 struct CheckHelloValidatedContext *chvc = cls;
2076 struct ValidationAddress *va;
2077 struct TransportPlugin *tp;
2080 struct GNUNET_PeerIdentity apeer;
2082 first_call = GNUNET_NO;
2083 if (chvc->e == NULL)
2086 first_call = GNUNET_YES;
2087 chvc->e = GNUNET_malloc (sizeof (struct ValidationList));
2088 GNUNET_assert (GNUNET_OK ==
2089 GNUNET_HELLO_get_key (h != NULL ? h : chvc->hello,
2090 &chvc->e->publicKey));
2092 GNUNET_TIME_relative_to_absolute (HELLO_VERIFICATION_TIMEOUT);
2093 chvc->e->next = pending_validations;
2094 pending_validations = chvc->e;
2099 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
2101 GNUNET_TIME_absolute_get (),
2102 &run_validation, chvc->e);
2104 else if (GNUNET_YES == first_call)
2106 /* no existing HELLO, all addresses are new */
2107 GNUNET_HELLO_iterate_addresses (chvc->hello,
2108 GNUNET_NO, &run_validation, chvc->e);
2112 return; /* wait for next call */
2113 /* finally, transmit validation attempts */
2114 GNUNET_assert (GNUNET_OK == GNUNET_HELLO_get_id (chvc->hello, &apeer));
2116 va = chvc->e->addresses;
2121 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2122 "Establishing `%s' connection to validate `%s' address `%s' of `%4s'\n",
2125 GNUNET_a2s ((const struct sockaddr *) va->peer_address->addr,
2126 va->peer_address->addrlen), GNUNET_i2s (&apeer));
2128 tp = find_transport (va->transport_name);
2129 GNUNET_assert (tp != NULL);
2130 /* This validation should happen inside the transport, not from the plugin! */
2131 va->ok = GNUNET_SYSERR;
2136 GNUNET_SCHEDULER_add_delayed (sched,
2137 GNUNET_TIME_absolute_get_remaining (chvc->
2139 &cleanup_validation, NULL);
2145 * Process HELLO-message.
2147 * @param plugin transport involved, may be NULL
2148 * @param message the actual message
2149 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
2152 process_hello (struct TransportPlugin *plugin,
2153 const struct GNUNET_MessageHeader *message)
2155 struct ValidationList *e;
2157 struct GNUNET_PeerIdentity target;
2158 const struct GNUNET_HELLO_Message *hello;
2159 struct CheckHelloValidatedContext *chvc;
2160 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
2162 hsize = ntohs (message->size);
2163 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
2164 (hsize < sizeof (struct GNUNET_MessageHeader)))
2167 return GNUNET_SYSERR;
2169 /* first, check if load is too high */
2170 if (GNUNET_OS_load_cpu_get (cfg) > 100)
2172 /* TODO: call to stats? */
2175 hello = (const struct GNUNET_HELLO_Message *) message;
2176 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
2178 GNUNET_break_op (0);
2179 return GNUNET_SYSERR;
2181 GNUNET_CRYPTO_hash (&publicKey,
2182 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2183 &target.hashPubKey);
2185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2186 "Processing `%s' message for `%4s' of size %d (hsize is %d)\n",
2187 "HELLO", GNUNET_i2s (&target), GNUNET_HELLO_size(hello), hsize);
2191 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2192 "Notifying peerinfo about peer %s\n",
2193 GNUNET_i2s (&target));
2195 /* For some reason the line below causes something to hang up... maybe peerinfo isn't ready yet? */
2196 /*GNUNET_PEERINFO_add_peer (cfg, sched, &target, hello); */
2198 /* check if a HELLO for this peer is already on the validation list */
2199 e = pending_validations;
2202 if (0 == memcmp (&e->publicKey,
2205 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded)))
2207 /* TODO: call to stats? */
2209 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2210 "`%s' message for peer `%4s' is already pending; ignoring new message\n",
2211 "HELLO", GNUNET_i2s (&target));
2217 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
2218 chvc->plugin = plugin;
2219 chvc->hello = (struct GNUNET_HELLO_Message *) &chvc[1];
2221 memcpy (chvc->hello, hello, hsize);
2222 /* finally, check if HELLO was previously validated
2223 (continuation will then schedule actual validation) */
2224 chvc->piter = GNUNET_PEERINFO_iterate (cfg,
2228 HELLO_VERIFICATION_TIMEOUT,
2229 &check_hello_validated, chvc);
2235 * The peer specified by the given neighbor has timed-out or a plugin
2236 * has disconnected. We may either need to do nothing (other plugins
2237 * still up), or trigger a full disconnect and clean up. This
2238 * function updates our state and does the necessary notifications.
2239 * Also notifies our clients that the neighbor is now officially
2242 * @param n the neighbor list entry for the peer
2243 * @param check should we just check if all plugins
2244 * disconnected or must we ask all plugins to
2248 disconnect_neighbor (struct NeighborList *current_handle, int check)
2250 struct ReadyList *rpos;
2251 struct NeighborList *npos;
2252 struct NeighborList *nprev;
2253 struct NeighborList *n;
2254 struct MessageQueue *mq;
2255 struct PeerAddressList *peer_addresses;
2257 if (neighbors == NULL)
2258 return; /* We don't have any neighbors, so client has an already removed handle! */
2261 while ((npos != NULL) && (current_handle != npos))
2265 return; /* Couldn't find neighbor in existing list, must have been already removed! */
2269 if (GNUNET_YES == check)
2272 while (NULL != rpos)
2274 peer_addresses = rpos->addresses;
2275 while (peer_addresses != NULL)
2277 if (GNUNET_YES == peer_addresses->connected)
2278 return; /* still connected */
2279 peer_addresses = peer_addresses->next;
2286 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2287 "Disconnecting from `%4s'\n", GNUNET_i2s (&n->id));
2289 /* remove n from neighbors list */
2292 while ((npos != NULL) && (npos != n))
2297 GNUNET_assert (npos != NULL);
2299 neighbors = n->next;
2301 nprev->next = n->next;
2303 /* notify all clients about disconnect */
2304 notify_clients_disconnect (&n->id);
2306 /* clean up all plugins, cancel connections and pending transmissions */
2307 while (NULL != (rpos = n->plugins))
2309 n->plugins = rpos->next;
2310 GNUNET_assert (rpos->neighbor == n);
2311 if (GNUNET_YES == rpos->connected)
2312 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
2316 /* free all messages on the queue */
2317 while (NULL != (mq = n->messages))
2319 n->messages = mq->next;
2320 GNUNET_assert (0 == memcmp(mq->neighbor_id, &n->id, sizeof(struct GNUNET_PeerIdentity)));
2323 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
2324 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
2325 /* finally, free n itself */
2331 * We have received a PING message from someone. Need to send a PONG message
2332 * in response to the peer by any means necessary. Of course, with something
2333 * like TCP where a connection exists, we may want to send it that way. But
2334 * we may not be able to make that distinction...
2336 static int handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
2337 const struct GNUNET_PeerIdentity *peer,
2338 const char *sender_address,
2339 size_t sender_address_len)
2341 struct TransportPlugin *plugin = cls;
2342 struct TransportPingMessage *ping;
2343 struct TransportPongMessage *pong;
2344 struct PeerAddressList *peer_address;
2346 struct NeighborList *n;
2349 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2350 "Processing `%s' from `%s'\n",
2351 "PING", GNUNET_a2s ((const struct sockaddr *)sender_address, sender_address_len));
2354 msize = ntohs (message->size);
2355 if (msize < sizeof (struct TransportPingMessage))
2357 GNUNET_break_op (0);
2358 return GNUNET_SYSERR;
2360 ping = (struct TransportPingMessage *) message;
2361 if (0 != memcmp (&ping->target,
2362 plugin->env.my_identity,
2363 sizeof (struct GNUNET_PeerIdentity)))
2365 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2366 _("Received `%s' message not destined for me!\n"), "PING");
2367 return GNUNET_SYSERR;
2370 msize -= sizeof (struct TransportPingMessage);
2372 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len);
2373 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len);
2374 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
2375 pong->purpose.size =
2376 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2378 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sender_address_len);
2379 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_TCP_PING);
2380 pong->challenge = ping->challenge;
2381 pong->addrlen = htons(sender_address_len);
2383 memcpy(&pong->signer, &my_public_key, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2384 memcpy (&pong[1], sender_address, sender_address_len);
2385 GNUNET_assert (GNUNET_OK ==
2386 GNUNET_CRYPTO_rsa_sign (my_private_key,
2387 &pong->purpose, &pong->signature));
2389 n = find_neighbor(peer);
2391 n = setup_new_neighbor(peer);
2393 peer_address = find_peer_address(n, sender_address, sender_address_len);
2394 if (peer_address == NULL)
2395 peer_address = add_peer_address(n, sender_address, sender_address_len);
2397 peer_address->timeout = GNUNET_TIME_relative_to_absolute(GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2399 /* We don't use the peer_address because the address we received the message from may not
2400 * be a reliable way to send it back! We add it to the list which should queue up a separate
2401 * ping to determine if the address is viable.
2403 transmit_to_peer(NULL, NULL, TRANSPORT_DEFAULT_PRIORITY, (char *)pong, ntohs(pong->header.size), GNUNET_NO, n);
2410 * Function called by the plugin for each received message.
2411 * Update data volumes, possibly notify plugins about
2412 * reducing the rate at which they read from the socket
2413 * and generally forward to our receive callback.
2415 * @param cls the "struct TransportPlugin *" we gave to the plugin
2416 * @param message the message, NULL if peer was disconnected
2417 * @param distance the transport cost to this peer (not latency!)
2418 * @param sender_address the address that the sender reported
2419 * (opaque to transport service)
2420 * @param sender_address_len the length of the sender address
2421 * @param peer (claimed) identity of the other peer
2422 * @return the new service_context that the plugin should use
2423 * for future receive calls for messages from this
2428 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
2429 const struct GNUNET_MessageHeader *message,
2430 unsigned int distance, const char *sender_address,
2431 size_t sender_address_len)
2433 struct ReadyList *service_context;
2434 struct TransportPlugin *plugin = cls;
2435 struct TransportClient *cpos;
2436 struct InboundMessage *im;
2437 struct PeerAddressList *peer_address;
2439 struct NeighborList *n;
2441 n = find_neighbor (peer);
2444 if (message == NULL)
2445 return; /* disconnect of peer already marked down */
2446 n = setup_new_neighbor (peer);
2450 peer_address = find_peer_address(n, sender_address, sender_address_len);
2451 if (peer_address == NULL)
2452 peer_address = add_peer_address(n, sender_address, sender_address_len);
2454 service_context = n->plugins;
2455 while ((service_context != NULL) && (plugin != service_context->plugin))
2456 service_context = service_context->next;
2457 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
2458 if (message == NULL)
2461 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2462 "Receive failed from `%4s', triggering disconnect\n",
2463 GNUNET_i2s (&n->id));
2465 /* TODO: call stats */
2466 if (service_context != NULL)
2467 service_context->connected = GNUNET_NO;
2468 disconnect_neighbor (n, GNUNET_YES);
2472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2473 "Processing message of type `%u' received by plugin...\n",
2474 ntohs (message->type));
2476 if (service_context != NULL)
2478 if (service_context->connected == GNUNET_NO)
2480 /*service_context->connected = GNUNET_YES;*/
2481 /* FIXME: What to do here? Should we use these as well, to specify some Address
2482 * in the AddressList should be available?
2484 peer_address->transmit_ready = GNUNET_YES;
2485 peer_address->connect_attempts++;
2487 peer_address->timeout
2489 GNUNET_TIME_relative_to_absolute
2490 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2492 /* update traffic received amount ... */
2493 msize = ntohs (message->size);
2494 n->last_received += msize;
2495 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
2497 GNUNET_TIME_relative_to_absolute
2498 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2500 GNUNET_SCHEDULER_add_delayed (sched,
2501 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2502 &neighbor_timeout_task, n);
2504 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
2506 /* dropping message due to frequent inbound volume violations! */
2507 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
2508 GNUNET_ERROR_TYPE_BULK,
2510 ("Dropping incoming message due to repeated bandwidth quota violations.\n"));
2511 /* TODO: call stats */
2512 GNUNET_assert ((service_context == NULL) ||
2513 (NULL != service_context->neighbor));
2516 switch (ntohs (message->type))
2518 case GNUNET_MESSAGE_TYPE_HELLO:
2520 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2521 "Receiving `%s' message from `%4s'.\n", "HELLO",
2524 process_hello (plugin, message);
2526 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
2527 handle_ping(plugin, message, peer, sender_address, sender_address_len);
2529 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
2530 handle_pong(plugin, message, peer, sender_address, sender_address_len);
2534 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2535 "Received REAL MESSAGE type %u from `%4s', sending to all clients.\n",
2536 ntohs (message->type), GNUNET_i2s (peer));
2538 /* transmit message to all clients */
2539 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
2540 im->header.size = htons (sizeof (struct InboundMessage) + msize);
2541 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
2542 im->latency = n->latency;
2544 memcpy (&im[1], message, msize);
2547 while (cpos != NULL)
2549 transmit_to_client (cpos, &im->header, GNUNET_YES);
2554 GNUNET_assert ((service_context == NULL) ||
2555 (NULL != service_context->neighbor));
2560 * Handle START-message. This is the first message sent to us
2561 * by any client which causes us to add it to our list.
2563 * @param cls closure (always NULL)
2564 * @param client identification of the client
2565 * @param message the actual message
2568 handle_start (void *cls,
2569 struct GNUNET_SERVER_Client *client,
2570 const struct GNUNET_MessageHeader *message)
2572 struct TransportClient *c;
2573 struct ConnectInfoMessage cim;
2574 struct NeighborList *n;
2575 struct InboundMessage *im;
2576 struct GNUNET_MessageHeader *ack;
2579 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2580 "Received `%s' request from client\n", "START");
2585 if (c->client == client)
2587 /* client already on our list! */
2589 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2594 c = GNUNET_malloc (sizeof (struct TransportClient));
2598 if (our_hello != NULL)
2601 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2602 "Sending our own `%s' to new client\n", "HELLO");
2604 transmit_to_client (c,
2605 (const struct GNUNET_MessageHeader *) our_hello,
2607 /* tell new client about all existing connections */
2608 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2609 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2611 htonl (GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT / (60 * 1000));
2612 cim.latency = GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_ZERO); /* FIXME? */
2613 im = GNUNET_malloc (sizeof (struct InboundMessage) +
2614 sizeof (struct GNUNET_MessageHeader));
2615 im->header.size = htons (sizeof (struct InboundMessage) +
2616 sizeof (struct GNUNET_MessageHeader));
2617 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
2618 im->latency = GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_ZERO); /* FIXME? */
2619 ack = (struct GNUNET_MessageHeader *) &im[1];
2620 ack->size = htons (sizeof (struct GNUNET_MessageHeader));
2621 ack->type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ACK);
2622 for (n = neighbors; n != NULL; n = n->next)
2625 transmit_to_client (c, &cim.header, GNUNET_NO);
2626 if (n->received_pong)
2629 transmit_to_client (c, &im->header, GNUNET_NO);
2636 fprintf(stderr, "Our hello is NULL!\n");
2638 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2643 * Handle HELLO-message.
2645 * @param cls closure (always NULL)
2646 * @param client identification of the client
2647 * @param message the actual message
2650 handle_hello (void *cls,
2651 struct GNUNET_SERVER_Client *client,
2652 const struct GNUNET_MessageHeader *message)
2657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2658 "Received `%s' request from client\n", "HELLO");
2660 ret = process_hello (NULL, message);
2661 GNUNET_SERVER_receive_done (client, ret);
2666 * Handle SEND-message.
2668 * @param cls closure (always NULL)
2669 * @param client identification of the client
2670 * @param message the actual message
2673 handle_send (void *cls,
2674 struct GNUNET_SERVER_Client *client,
2675 const struct GNUNET_MessageHeader *message)
2677 struct TransportClient *tc;
2678 struct NeighborList *n;
2679 const struct OutboundMessage *obm;
2680 const struct GNUNET_MessageHeader *obmm;
2684 size = ntohs (message->size);
2686 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
2689 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2692 obm = (const struct OutboundMessage *) message;
2694 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2695 "Received `%s' request from client with target `%4s'\n",
2696 "SEND", GNUNET_i2s (&obm->peer));
2698 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
2699 msize = ntohs (obmm->size);
2700 if (size != msize + sizeof (struct OutboundMessage))
2703 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2706 n = find_neighbor (&obm->peer);
2708 n = setup_new_neighbor (&obm->peer); /* But won't ever add address, we have none! */
2710 while ((tc != NULL) && (tc->client != client))
2714 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2715 "Client asked to transmit %u-byte message of type %u to `%4s'\n",
2717 ntohs (obmm->type), GNUNET_i2s (&obm->peer));
2719 transmit_to_peer (tc, NULL, ntohl (obm->priority), (char *)obmm, ntohs (obmm->size), GNUNET_NO, n);
2720 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2725 * Handle SET_QUOTA-message.
2727 * @param cls closure (always NULL)
2728 * @param client identification of the client
2729 * @param message the actual message
2732 handle_set_quota (void *cls,
2733 struct GNUNET_SERVER_Client *client,
2734 const struct GNUNET_MessageHeader *message)
2736 const struct QuotaSetMessage *qsm =
2737 (const struct QuotaSetMessage *) message;
2738 struct NeighborList *n;
2739 struct TransportPlugin *p;
2740 struct ReadyList *rl;
2743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2744 "Received `%s' request from client for peer `%4s'\n",
2745 "SET_QUOTA", GNUNET_i2s (&qsm->peer));
2747 n = find_neighbor (&qsm->peer);
2750 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2754 if (n->quota_in < ntohl (qsm->quota_in))
2755 n->last_quota_update = GNUNET_TIME_absolute_get ();
2756 n->quota_in = ntohl (qsm->quota_in);
2761 p->api->set_receive_quota (p->api->cls,
2762 &qsm->peer, ntohl (qsm->quota_in));
2765 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2770 * Handle TRY_CONNECT-message.
2772 * @param cls closure (always NULL)
2773 * @param client identification of the client
2774 * @param message the actual message
2777 handle_try_connect (void *cls,
2778 struct GNUNET_SERVER_Client *client,
2779 const struct GNUNET_MessageHeader *message)
2781 const struct TryConnectMessage *tcm;
2782 struct NeighborList *neighbor;
2783 tcm = (const struct TryConnectMessage *) message;
2785 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2786 "Received `%s' request from client %p asking to connect to `%4s'\n",
2787 "TRY_CONNECT", client, GNUNET_i2s (&tcm->peer));
2789 neighbor = find_neighbor(&tcm->peer);
2791 if (neighbor == NULL)
2792 setup_new_neighbor (&tcm->peer);
2796 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2797 "Client asked to connect to `%4s', but connection already exists\n",
2798 "TRY_CONNECT", GNUNET_i2s (&tcm->peer));
2800 transmit_to_peer (NULL, NULL, 0,
2801 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2802 GNUNET_YES, neighbor);
2803 notify_clients_connect (&tcm->peer, GNUNET_TIME_UNIT_FOREVER_REL);
2805 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2809 transmit_address_to_client (void *cls, const char *address)
2811 struct GNUNET_SERVER_TransmitContext *tc = cls;
2814 if (NULL == address)
2817 slen = strlen (address) + 1;
2818 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
2819 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
2820 if (NULL == address)
2821 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
2825 * Handle AddressLookup-message.
2827 * @param cls closure (always NULL)
2828 * @param client identification of the client
2829 * @param message the actual message
2832 handle_address_lookup (void *cls,
2833 struct GNUNET_SERVER_Client *client,
2834 const struct GNUNET_MessageHeader *message)
2836 const struct AddressLookupMessage *alum;
2837 struct TransportPlugin *lsPlugin;
2838 const char *nameTransport;
2839 const char *address;
2841 struct GNUNET_SERVER_TransmitContext *tc;
2843 size = ntohs (message->size);
2844 if (size < sizeof (struct AddressLookupMessage))
2846 GNUNET_break_op (0);
2847 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2850 alum = (const struct AddressLookupMessage *) message;
2851 uint32_t addressLen = ntohl (alum->addrlen);
2852 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
2854 GNUNET_break_op (0);
2855 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2858 address = (const char *) &alum[1];
2859 nameTransport = (const char *) &address[addressLen];
2861 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
2863 GNUNET_break_op (0);
2864 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2867 struct GNUNET_TIME_Absolute timeout =
2868 GNUNET_TIME_absolute_ntoh (alum->timeout);
2869 struct GNUNET_TIME_Relative rtimeout =
2870 GNUNET_TIME_absolute_get_remaining (timeout);
2871 lsPlugin = find_transport (nameTransport);
2872 if (NULL == lsPlugin)
2874 tc = GNUNET_SERVER_transmit_context_create (client);
2875 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
2876 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
2877 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
2880 tc = GNUNET_SERVER_transmit_context_create (client);
2881 lsPlugin->api->address_pretty_printer (cls, nameTransport,
2882 address, addressLen, GNUNET_YES,
2884 &transmit_address_to_client, tc);
2888 * List of handlers for the messages understood by this
2891 static struct GNUNET_SERVER_MessageHandler handlers[] = {
2892 {&handle_start, NULL,
2893 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
2894 {&handle_hello, NULL,
2895 GNUNET_MESSAGE_TYPE_HELLO, 0},
2896 {&handle_send, NULL,
2897 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
2898 {&handle_set_quota, NULL,
2899 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
2900 {&handle_try_connect, NULL,
2901 GNUNET_MESSAGE_TYPE_TRANSPORT_TRY_CONNECT,
2902 sizeof (struct TryConnectMessage)},
2903 {&handle_address_lookup, NULL,
2904 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
2911 * Setup the environment for this plugin.
2914 create_environment (struct TransportPlugin *plug)
2916 plug->env.cfg = cfg;
2917 plug->env.sched = sched;
2918 plug->env.my_identity = &my_identity;
2919 plug->env.cls = plug;
2920 plug->env.receive = &plugin_env_receive;
2921 plug->env.notify_address = &plugin_env_notify_address;
2922 plug->env.default_quota_in =
2923 (GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT + 59999) / (60 * 1000);
2924 plug->env.max_connections = max_connect_per_transport;
2929 * Start the specified transport (load the plugin).
2932 start_transport (struct GNUNET_SERVER_Handle *server, const char *name)
2934 struct TransportPlugin *plug;
2937 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2938 _("Loading `%s' transport plugin\n"), name);
2939 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
2940 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
2941 create_environment (plug);
2942 plug->short_name = GNUNET_strdup (name);
2943 plug->lib_name = libname;
2944 plug->next = plugins;
2946 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
2947 if (plug->api == NULL)
2949 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2950 _("Failed to load transport plugin for `%s'\n"), name);
2951 GNUNET_free (plug->short_name);
2952 plugins = plug->next;
2953 GNUNET_free (libname);
2960 * Called whenever a client is disconnected. Frees our
2961 * resources associated with that client.
2963 * @param cls closure
2964 * @param client identification of the client
2967 client_disconnect_notification (void *cls,
2968 struct GNUNET_SERVER_Client *client)
2970 struct TransportClient *pos;
2971 struct TransportClient *prev;
2972 struct ClientMessageQueueEntry *mqe;
2977 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2978 "Client disconnected, cleaning up.\n");
2982 while ((pos != NULL) && (pos->client != client))
2989 while (NULL != (mqe = pos->message_queue_head))
2991 pos->message_queue_head = mqe->next;
2994 pos->message_queue_head = NULL;
2996 clients = pos->next;
2998 prev->next = pos->next;
2999 if (GNUNET_YES == pos->tcs_pending)
3009 * Function called when the service shuts down. Unloads our plugins.
3011 * @param cls closure, unused
3012 * @param tc task context (unused)
3015 unload_plugins (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3017 struct TransportPlugin *plug;
3018 struct AddressList *al;
3021 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3022 "Transport service is unloading plugins...\n");
3024 while (NULL != (plug = plugins))
3026 plugins = plug->next;
3027 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
3028 GNUNET_free (plug->lib_name);
3029 GNUNET_free (plug->short_name);
3030 while (NULL != (al = plug->addresses))
3032 plug->addresses = al->next;
3037 if (my_private_key != NULL)
3038 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3039 GNUNET_free_non_null (our_hello);
3044 * Initiate transport service.
3046 * @param cls closure
3047 * @param s scheduler to use
3048 * @param serv the initialized server
3049 * @param c configuration to use
3053 struct GNUNET_SCHEDULER_Handle *s,
3054 struct GNUNET_SERVER_Handle *serv,
3055 const struct GNUNET_CONFIGURATION_Handle *c)
3060 unsigned long long tneigh;
3065 /* parse configuration */
3067 GNUNET_CONFIGURATION_get_value_number (c,
3072 GNUNET_CONFIGURATION_get_value_filename (c,
3074 "HOSTKEY", &keyfile)))
3076 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3078 ("Transport service is lacking key configuration settings. Exiting.\n"));
3079 GNUNET_SCHEDULER_shutdown (s);
3082 max_connect_per_transport = (uint32_t) tneigh;
3083 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3084 GNUNET_free (keyfile);
3085 if (my_private_key == NULL)
3087 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3089 ("Transport service could not access hostkey. Exiting.\n"));
3090 GNUNET_SCHEDULER_shutdown (s);
3093 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3094 GNUNET_CRYPTO_hash (&my_public_key,
3095 sizeof (my_public_key), &my_identity.hashPubKey);
3096 /* setup notification */
3098 GNUNET_SERVER_disconnect_notify (server,
3099 &client_disconnect_notification, NULL);
3100 /* load plugins... */
3103 GNUNET_CONFIGURATION_get_value_string (c,
3104 "TRANSPORT", "PLUGINS", &plugs))
3106 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3107 _("Starting transport plugins `%s'\n"), plugs);
3108 pos = strtok (plugs, " ");
3111 start_transport (server, pos);
3113 pos = strtok (NULL, " ");
3115 GNUNET_free (plugs);
3117 GNUNET_SCHEDULER_add_delayed (sched,
3118 GNUNET_TIME_UNIT_FOREVER_REL,
3119 &unload_plugins, NULL);
3124 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
3126 /* process client requests */
3127 GNUNET_SERVER_add_handlers (server, handlers);
3132 * The main function for the transport service.
3134 * @param argc number of arguments from the command line
3135 * @param argv command line arguments
3136 * @return 0 ok, 1 on error
3139 main (int argc, char *const *argv)
3141 return (GNUNET_OK ==
3142 GNUNET_SERVICE_run (argc,
3145 GNUNET_SERVICE_OPTION_NONE,
3146 &run, NULL)) ? 0 : 1;
3149 /* end of gnunet-service-transport.c */