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.
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;
859 if (n->last_received < allowed)
861 remaining = allowed - n->last_received;
863 remaining /= n->quota_in;
866 if (remaining > MAX_BANDWIDTH_CARRY)
867 remaining = MAX_BANDWIDTH_CARRY;
868 n->last_received = 0;
869 n->last_quota_update = GNUNET_TIME_absolute_get ();
870 n->last_quota_update.value -= remaining;
871 if (n->quota_violation_count > 0)
872 n->quota_violation_count--;
876 n->last_received -= allowed;
877 n->last_quota_update = GNUNET_TIME_absolute_get ();
878 if (n->last_received > allowed)
880 /* more than twice the allowed rate! */
881 n->quota_violation_count += 10;
888 * Function called to notify a client about the socket
889 * being ready to queue more data. "buf" will be
890 * NULL and "size" zero if the socket was closed for
891 * writing in the meantime.
894 * @param size number of bytes available in buf
895 * @param buf where the callee should write the message
896 * @return number of bytes written to buf
899 transmit_to_client_callback (void *cls, size_t size, void *buf)
901 struct TransportClient *client = cls;
902 struct ClientMessageQueueEntry *q;
905 const struct GNUNET_MessageHeader *msg;
906 struct GNUNET_CONNECTION_TransmitHandle *th;
911 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
912 "Transmission to client failed, closing connection.\n");
913 /* fatal error with client, free message queue! */
914 while (NULL != (q = client->message_queue_head))
916 client->message_queue_head = q->next;
919 client->message_queue_tail = NULL;
920 client->message_count = 0;
925 while (NULL != (q = client->message_queue_head))
927 msg = (const struct GNUNET_MessageHeader *) &q[1];
928 msize = ntohs (msg->size);
929 if (msize + tsize > size)
932 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
933 "Transmitting message of type %u to client.\n",
936 client->message_queue_head = q->next;
938 client->message_queue_tail = NULL;
939 memcpy (&cbuf[tsize], msg, msize);
942 client->message_count--;
946 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
947 th = GNUNET_SERVER_notify_transmit_ready (client->client,
949 GNUNET_TIME_UNIT_FOREVER_REL,
950 &transmit_to_client_callback,
952 GNUNET_assert (th != NULL);
959 * Send the specified message to the specified client. Since multiple
960 * messages may be pending for the same client at a time, this code
961 * makes sure that no message is lost.
963 * @param client client to transmit the message to
964 * @param msg the message to send
965 * @param may_drop can this message be dropped if the
966 * message queue for this client is getting far too large?
969 transmit_to_client (struct TransportClient *client,
970 const struct GNUNET_MessageHeader *msg, int may_drop)
972 struct ClientMessageQueueEntry *q;
974 struct GNUNET_CONNECTION_TransmitHandle *th;
976 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
978 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
980 ("Dropping message, have %u messages pending (%u is the soft limit)\n"),
981 client->message_count, MAX_PENDING);
982 /* TODO: call to statistics... */
985 client->message_count++;
986 msize = ntohs (msg->size);
987 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
988 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
989 memcpy (&q[1], msg, msize);
990 /* append to message queue */
991 if (client->message_queue_tail == NULL)
993 client->message_queue_tail = q;
997 client->message_queue_tail->next = q;
998 client->message_queue_tail = q;
1000 if (client->message_queue_head == NULL)
1002 client->message_queue_head = q;
1003 th = GNUNET_SERVER_notify_transmit_ready (client->client,
1005 GNUNET_TIME_UNIT_FOREVER_REL,
1006 &transmit_to_client_callback,
1008 GNUNET_assert (th != NULL);
1014 * Find alternative plugins for communication.
1016 * @param neighbor for which neighbor should we try to find
1020 try_alternative_plugins (struct NeighborList *neighbor)
1022 struct ReadyList *rl;
1024 if ((neighbor->plugins != NULL) &&
1025 (neighbor->retry_plugins_time.value >
1026 GNUNET_TIME_absolute_get ().value))
1027 return; /* don't try right now */
1028 neighbor->retry_plugins_time
1029 = GNUNET_TIME_relative_to_absolute (PLUGIN_RETRY_FREQUENCY);
1031 rl = neighbor->plugins;
1032 #if WTF /* FIXME: What is this supposed to do? */
1035 if (rl->connect_attempts > 0)
1036 rl->connect_attempts--; /* amnesty */
1044 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1045 * upon "completion" of a send request. This tells the API
1046 * that it is now legal to send another message to the given
1049 * @param cls closure, identifies the entry on the
1050 * message queue that was transmitted and the
1051 * client responsible for queueing the message
1052 * @param target the peer receiving the message
1053 * @param result GNUNET_OK on success, if the transmission
1054 * failed, we should not tell the client to transmit
1058 transmit_send_continuation (void *cls,
1059 const struct GNUNET_PeerIdentity *target,
1062 struct MessageQueue *mq = cls;
1063 /*struct ReadyList *rl;*/ /* We no longer use the ReadyList for anything here, safe to remove? */
1064 struct SendOkMessage send_ok_msg;
1065 struct NeighborList *n;
1067 GNUNET_assert (mq != NULL);
1068 n = find_neighbor(mq->neighbor_id);
1069 if (n == NULL) /* Neighbor must have been removed asynchronously! */
1072 /* Otherwise, let's make sure we've got the right peer */
1074 memcmp (&n->id, target,
1075 sizeof (struct GNUNET_PeerIdentity)));
1077 if (result == GNUNET_OK)
1079 mq->specific_peer->timeout =
1080 GNUNET_TIME_relative_to_absolute
1081 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1086 "Transmission to peer `%s' failed, marking connection as down.\n",
1087 GNUNET_i2s (target));
1088 mq->specific_peer->connected = GNUNET_NO;
1090 if (!mq->internal_msg)
1093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1094 "Setting transmit_ready on transport!\n");
1096 mq->specific_peer->transmit_ready = GNUNET_YES;
1099 if (mq->client != NULL)
1101 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1102 "Notifying client %p about transmission to peer `%4s'.\n",
1103 mq->client, GNUNET_i2s (target));
1104 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1105 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1106 send_ok_msg.success = htonl (result);
1107 send_ok_msg.peer = n->id;
1108 transmit_to_client (mq->client, &send_ok_msg.header, GNUNET_NO);
1110 GNUNET_free (mq->message_buf);
1111 GNUNET_free (mq->neighbor_id);
1113 /* one plugin just became ready again, try transmitting
1114 another message (if available) */
1115 if (result == GNUNET_OK)
1116 try_transmission_to_peer (n);
1118 disconnect_neighbor (n, GNUNET_YES);
1124 struct PeerAddressList *
1125 find_ready_address(struct NeighborList *neighbor)
1127 struct ReadyList *head = neighbor->plugins;
1128 struct PeerAddressList *addresses;
1129 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1130 struct PeerAddressList *best_address;
1132 best_address = NULL;
1133 while (head != NULL)
1135 addresses = head->addresses;
1137 while (addresses != NULL)
1139 if ((addresses->timeout.value < now.value) && (addresses->connected == GNUNET_YES))
1142 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1143 "Marking long-time inactive connection to `%4s' as down.\n",
1144 GNUNET_i2s (&addresses->ready_list->neighbor->id));
1146 addresses->connected = GNUNET_NO;
1148 addresses = addresses->next;
1151 addresses = head->addresses;
1152 while (addresses != NULL)
1154 if ((addresses->connected == GNUNET_YES) &&
1155 (addresses->transmit_ready == GNUNET_YES) &&
1156 ((best_address == NULL) || (addresses->latency.value < best_address->latency.value)))
1159 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1160 "Found address with latency %llu (previous best was %llu), setting as best found yet!\n",
1161 addresses->latency.value, best_address == NULL ? -1LL : best_address->latency.value);
1163 best_address = addresses;
1165 addresses = addresses->next;
1170 if (best_address != NULL)
1172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1173 "Best address found has latency of %llu!\n",
1174 best_address->latency.value);
1177 return best_address;
1182 * Check the ready list for the given neighbor and
1183 * if a plugin is ready for transmission (and if we
1184 * have a message), do so!
1187 try_transmission_to_peer (struct NeighborList *neighbor)
1189 struct GNUNET_TIME_Relative min_latency;
1190 struct ReadyList *rl;
1191 struct MessageQueue *mq;
1192 struct GNUNET_TIME_Absolute now;
1194 if (neighbor->messages == NULL)
1195 return 0; /* nothing to do */
1196 try_alternative_plugins (neighbor);
1197 min_latency = GNUNET_TIME_UNIT_FOREVER_REL;
1199 mq = neighbor->messages;
1200 now = GNUNET_TIME_absolute_get ();
1202 if (mq->specific_peer == NULL)
1203 mq->specific_peer = find_ready_address(neighbor); /* Find first available (or best!) address to transmit to */
1205 if (mq->specific_peer == NULL)
1208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1209 "No plugin ready to transmit message\n");
1211 return 0; /* nobody ready */
1214 rl = mq->specific_peer->ready_list;
1215 neighbor->messages = mq->next;
1216 mq->plugin = rl->plugin;
1217 if (!mq->internal_msg)
1218 mq->specific_peer->transmit_ready = GNUNET_NO;
1220 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1221 "Giving message of size `%u' for `%4s' to plugin `%s'\n",
1222 mq->message_buf_size,
1223 GNUNET_i2s (&neighbor->id), rl->plugin->short_name);
1226 return rl->plugin->api->send (rl->plugin->api->cls,
1229 mq->message_buf_size,
1231 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1232 mq->specific_peer->addr,
1233 mq->specific_peer->addrlen,
1235 &transmit_send_continuation, mq);
1241 * Send the specified message to the specified peer.
1243 * @param client source of the transmission request (can be NULL)
1244 * @param peer_address PeerAddressList where we should send this message
1245 * @param priority how important is the message
1246 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1247 * @param message_buf_size total size of all messages in message_buf
1248 * @param is_internal is this an internal message
1249 * @param neighbor handle to the neighbor for transmission
1252 transmit_to_peer (struct TransportClient *client,
1253 struct PeerAddressList *peer_address,
1254 unsigned int priority,
1255 const char *message_buf,
1256 size_t message_buf_size,
1257 int is_internal, struct NeighborList *neighbor)
1259 struct MessageQueue *mq;
1260 struct MessageQueue *mqe;
1265 /* check for duplicate submission */
1266 mq = neighbor->messages;
1269 if (mq->client == client)
1271 /* client transmitted to same peer twice
1272 before getting SendOk! */
1279 mq = GNUNET_malloc (sizeof (struct MessageQueue));
1280 mq->specific_peer = peer_address;
1281 mq->client = client;
1282 m = GNUNET_malloc (message_buf_size);
1283 memcpy (m, message_buf, message_buf_size);
1284 mq->message_buf = m;
1285 mq->message_buf_size = message_buf_size;
1286 mq->neighbor_id = GNUNET_malloc(sizeof (struct GNUNET_PeerIdentity));
1288 memcpy(mq->neighbor_id, &neighbor->id, sizeof(struct GNUNET_PeerIdentity));
1289 mq->internal_msg = is_internal;
1290 mq->priority = priority;
1293 mqe = neighbor->messages;
1295 while (mqe->next != NULL)
1300 neighbor->messages = mq;
1307 return try_transmission_to_peer (neighbor);
1314 struct GeneratorContext
1316 struct TransportPlugin *plug_pos;
1317 struct AddressList *addr_pos;
1318 struct GNUNET_TIME_Absolute expiration;
1326 address_generator (void *cls, size_t max, void *buf)
1328 struct GeneratorContext *gc = cls;
1331 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1333 gc->plug_pos = gc->plug_pos->next;
1334 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1336 if (NULL == gc->plug_pos)
1341 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1344 gc->addr_pos->addrlen, buf, max);
1345 gc->addr_pos = gc->addr_pos->next;
1351 * Construct our HELLO message from all of the addresses of
1352 * all of the transports.
1357 struct GNUNET_HELLO_Message *hello;
1358 struct TransportClient *cpos;
1359 struct NeighborList *npos;
1360 struct GeneratorContext gc;
1362 gc.plug_pos = plugins;
1363 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1364 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1365 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1367 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1368 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1371 while (cpos != NULL)
1373 transmit_to_client (cpos,
1374 (const struct GNUNET_MessageHeader *) hello,
1379 GNUNET_free_non_null (our_hello);
1381 our_hello_version++;
1382 GNUNET_PEERINFO_add_peer (cfg, sched, &my_identity, our_hello);
1384 while (npos != NULL)
1387 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1388 "Transmitting updated `%s' to neighbor `%4s'\n",
1389 "HELLO", GNUNET_i2s (&npos->id));
1390 #endif // FIXME: just testing
1391 //transmit_to_peer (NULL, NULL, 0,
1392 // (const char *) our_hello, GNUNET_HELLO_size(our_hello),
1393 // GNUNET_YES, npos);
1400 * Task used to clean up expired addresses for a plugin.
1402 * @param cls closure
1406 expire_address_task (void *cls,
1407 const struct GNUNET_SCHEDULER_TaskContext *tc);
1411 * Update the list of addresses for this plugin,
1412 * expiring those that are past their expiration date.
1414 * @param plugin addresses of which plugin should be recomputed?
1415 * @param fresh set to GNUNET_YES if a new address was added
1416 * and we need to regenerate the HELLO even if nobody
1420 update_addresses (struct TransportPlugin *plugin, int fresh)
1422 struct GNUNET_TIME_Relative min_remaining;
1423 struct GNUNET_TIME_Relative remaining;
1424 struct GNUNET_TIME_Absolute now;
1425 struct AddressList *pos;
1426 struct AddressList *prev;
1427 struct AddressList *next;
1430 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1431 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1432 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1433 now = GNUNET_TIME_absolute_get ();
1434 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1435 expired = GNUNET_NO;
1437 pos = plugin->addresses;
1441 if (pos->expires.value < now.value)
1443 expired = GNUNET_YES;
1445 plugin->addresses = pos->next;
1447 prev->next = pos->next;
1452 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1453 if (remaining.value < min_remaining.value)
1454 min_remaining = remaining;
1460 if (expired || fresh)
1462 if (min_remaining.value < GNUNET_TIME_UNIT_FOREVER_REL.value)
1463 plugin->address_update_task
1464 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1466 &expire_address_task, plugin);
1472 * Task used to clean up expired addresses for a plugin.
1474 * @param cls closure
1478 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1480 struct TransportPlugin *plugin = cls;
1481 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1482 update_addresses (plugin, GNUNET_NO);
1487 * Function that must be called by each plugin to notify the
1488 * transport service about the addresses under which the transport
1489 * provided by the plugin can be reached.
1491 * @param cls closure
1492 * @param name name of the transport that generated the address
1493 * @param addr one of the addresses of the host, NULL for the last address
1494 * the specific address format depends on the transport
1495 * @param addrlen length of the address
1496 * @param expires when should this address automatically expire?
1499 plugin_env_notify_address (void *cls,
1503 struct GNUNET_TIME_Relative expires)
1505 struct TransportPlugin *p = cls;
1506 struct AddressList *al;
1507 struct GNUNET_TIME_Absolute abex;
1509 abex = GNUNET_TIME_relative_to_absolute (expires);
1510 GNUNET_assert (p == find_transport (name));
1515 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
1517 if (al->expires.value < abex.value)
1524 al = GNUNET_malloc (sizeof (struct AddressList) + addrlen);
1526 al->next = p->addresses;
1529 al->addrlen = addrlen;
1530 memcpy (&al[1], addr, addrlen);
1531 update_addresses (p, GNUNET_YES);
1536 * Notify all of our clients about a peer connecting.
1539 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
1540 struct GNUNET_TIME_Relative latency)
1542 struct ConnectInfoMessage cim;
1543 struct TransportClient *cpos;
1545 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
1546 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
1547 cim.quota_out = htonl (GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT / (60 * 1000));
1548 cim.latency = GNUNET_TIME_relative_hton (latency);
1549 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
1551 while (cpos != NULL)
1553 transmit_to_client (cpos, &cim.header, GNUNET_NO);
1560 * Notify all of our clients about a peer disconnecting.
1563 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
1565 struct DisconnectInfoMessage dim;
1566 struct TransportClient *cpos;
1568 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
1569 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1570 dim.reserved = htonl (0);
1571 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1573 while (cpos != NULL)
1575 transmit_to_client (cpos, &dim.header, GNUNET_NO);
1582 * Copy any validated addresses to buf.
1584 * @return 0 once all addresses have been
1588 list_validated_addresses (void *cls, size_t max, void *buf)
1590 struct ValidationAddress **va = cls;
1593 while ((NULL != *va) && ((*va)->ok != GNUNET_YES))
1597 ret = GNUNET_HELLO_add_address ((*va)->transport_name,
1599 (*va)->peer_address->addr, (*va)->peer_address->addrlen, buf, max);
1606 * HELLO validation cleanup task.
1609 cleanup_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1611 struct ValidationAddress *va;
1612 struct ValidationList *pos;
1613 struct ValidationList *prev;
1614 struct GNUNET_TIME_Absolute now;
1615 struct GNUNET_TIME_Absolute first;
1616 struct GNUNET_HELLO_Message *hello;
1617 struct GNUNET_PeerIdentity pid;
1618 struct NeighborList *n;
1620 now = GNUNET_TIME_absolute_get ();
1622 pos = pending_validations;
1625 if (pos->timeout.value < now.value)
1628 pending_validations = pos->next;
1630 prev->next = pos->next;
1631 va = pos->addresses;
1632 hello = GNUNET_HELLO_create (&pos->publicKey,
1633 &list_validated_addresses, &va);
1634 GNUNET_CRYPTO_hash (&pos->publicKey,
1636 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1640 "Creating persistent `%s' message for peer `%4s' based on confirmed addresses.\n",
1641 "HELLO", GNUNET_i2s (&pid));
1643 GNUNET_PEERINFO_add_peer (cfg, sched, &pid, hello);
1644 n = find_neighbor (&pid);
1647 try_transmission_to_peer (n);
1649 GNUNET_free (hello);
1650 while (NULL != (va = pos->addresses))
1652 pos->addresses = va->next;
1653 GNUNET_free (va->transport_name);
1658 pos = pending_validations;
1667 /* finally, reschedule cleanup if needed; list is
1668 ordered by timeout, so we need the last element... */
1669 if (NULL != pending_validations)
1671 first = pending_validations->timeout;
1672 pos = pending_validations;
1675 first = GNUNET_TIME_absolute_min (first, pos->timeout);
1678 if (tc->reason != GNUNET_SCHEDULER_REASON_SHUTDOWN)
1680 GNUNET_SCHEDULER_add_delayed (sched,
1681 GNUNET_TIME_absolute_get_remaining
1682 (first), &cleanup_validation, NULL);
1689 * Function that will be called if we receive a validation
1690 * of an address challenge that we transmitted to another
1691 * peer. Note that the validation should only be considered
1692 * acceptable if the challenge matches AND if the sender
1693 * address is at least a plausible address for this peer
1694 * (otherwise we may be seeing a MiM attack).
1696 * @param cls closure
1697 * @param name name of the transport that generated the address
1698 * @param peer who responded to our challenge
1699 * @param challenge the challenge number we presumably used
1700 * @param sender_addr string describing our sender address (as observed
1701 * by the other peer in human-readable format)
1704 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
1705 const struct GNUNET_PeerIdentity *peer,
1706 const char *sender_address,
1707 size_t sender_address_len)
1709 unsigned int not_done;
1711 struct ValidationList *pos;
1712 struct ValidationAddress *va;
1713 struct GNUNET_PeerIdentity id;
1714 const struct TransportPongMessage *pong = (const struct TransportPongMessage *)message;
1716 unsigned int challenge = ntohl(pong->challenge);
1717 pos = pending_validations;
1721 GNUNET_CRYPTO_hash (&pos->publicKey,
1723 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1725 if (0 == memcmp (peer, &id, sizeof (struct GNUNET_PeerIdentity)))
1732 /* TODO: call statistics (unmatched PONG) */
1733 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1735 ("Received validation response but have no record of any validation request for `%4s' (out of %d). Ignoring.\n"),
1736 GNUNET_i2s (peer), count);
1740 matched = GNUNET_NO;
1741 va = pos->addresses;
1744 if (va->challenge == challenge)
1747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1748 "Confirmed validity of address, peer `%4s' has address `%s'.\n",
1750 GNUNET_a2s ((const struct sockaddr *) va->peer_address->addr,
1751 va->peer_address->addrlen));
1753 GNUNET_log (GNUNET_ERROR_TYPE_INFO | GNUNET_ERROR_TYPE_BULK,
1755 ("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"),
1756 GNUNET_a2s ((const struct sockaddr *) &pong[1],
1757 ntohs(pong->addrlen)), va->transport_name);
1758 va->ok = GNUNET_YES;
1760 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1761 matched = GNUNET_YES;
1762 va->peer_address->connected = GNUNET_YES;
1763 va->peer_address->latency = GNUNET_TIME_absolute_get_difference(va->send_time, GNUNET_TIME_absolute_get());
1765 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1766 "Confirmed validity of address, peer `%4s' has address `%s', latency of %llu\n",
1768 GNUNET_a2s ((const struct sockaddr *) va->peer_address->addr,
1769 va->peer_address->addrlen), (unsigned long long)va->peer_address->latency.value);
1771 va->peer_address->transmit_ready = GNUNET_YES;
1772 va->peer_address->expires = GNUNET_TIME_relative_to_absolute
1773 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1775 if (va->ok != GNUNET_YES)
1779 if (GNUNET_NO == matched)
1781 /* TODO: call statistics (unmatched PONG) */
1782 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1784 ("Received `%s' message but have no record of a matching `%s' message. Ignoring.\n"),
1790 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1791 "All addresses validated, will now construct `%s' for `%4s'.\n",
1792 "HELLO", GNUNET_i2s (peer));
1794 pos->timeout.value = 0;
1795 GNUNET_SCHEDULER_add_with_priority (sched,
1796 GNUNET_SCHEDULER_PRIORITY_IDLE,
1797 &cleanup_validation, NULL);
1803 * Add an entry for each of our transport plugins
1804 * (that are able to send) to the list of plugins
1805 * for this neighbor.
1807 * @param neighbor to initialize
1810 add_plugins (struct NeighborList *neighbor)
1812 struct TransportPlugin *tp;
1813 struct ReadyList *rl;
1815 neighbor->retry_plugins_time
1816 = GNUNET_TIME_relative_to_absolute (PLUGIN_RETRY_FREQUENCY);
1820 if (tp->api->send != NULL)
1822 rl = GNUNET_malloc (sizeof (struct ReadyList));
1823 rl->next = neighbor->plugins;
1824 neighbor->plugins = rl;
1826 rl->neighbor = neighbor;
1827 rl->addresses = NULL;
1834 neighbor_timeout_task (void *cls,
1835 const struct GNUNET_SCHEDULER_TaskContext *tc)
1837 struct NeighborList *n = cls;
1840 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1841 "Neighbor `%4s' has timed out!\n", GNUNET_i2s (&n->id));
1843 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1844 disconnect_neighbor (n, GNUNET_NO);
1848 * Create a fresh entry in our neighbor list for the given peer.
1849 * Will try to transmit our current HELLO to the new neighbor. Also
1850 * notifies our clients about the new "connection".
1852 * @param peer the peer for which we create the entry
1853 * @return the new neighbor list entry
1855 static struct NeighborList *
1856 setup_new_neighbor (const struct GNUNET_PeerIdentity *peer)
1858 struct NeighborList *n;
1860 GNUNET_assert (our_hello != NULL);
1861 n = GNUNET_malloc (sizeof (struct NeighborList));
1862 n->next = neighbors;
1865 n->last_quota_update = GNUNET_TIME_absolute_get ();
1867 GNUNET_TIME_relative_to_absolute
1868 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1869 n->quota_in = (GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT + 59999) / (60 * 1000);
1871 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
1872 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1873 &neighbor_timeout_task, n);
1874 transmit_to_peer (NULL, NULL, 0,
1875 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
1877 notify_clients_connect (peer, GNUNET_TIME_UNIT_FOREVER_REL);
1881 static struct PeerAddressList *
1882 add_peer_address(struct NeighborList *neighbor, const char *addr, size_t addrlen)
1884 /* FIXME: should return a list of PeerAddressLists, support for multiple transports! */
1885 struct ReadyList *head = neighbor->plugins;
1886 struct PeerAddressList * new_address;
1888 GNUNET_assert(addr != NULL);
1891 while (head != NULL)
1893 new_address = GNUNET_malloc(sizeof(struct PeerAddressList));
1894 new_address->addr = GNUNET_malloc(addrlen);
1895 memcpy(new_address->addr, addr, addrlen);
1896 new_address->addrlen = addrlen;
1897 new_address->connect_attempts = 0;
1898 new_address->connected = GNUNET_YES; /* Set connected to GNUNET_YES, assuming that we're good */
1899 new_address->expires = GNUNET_TIME_relative_to_absolute
1900 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1901 new_address->latency = GNUNET_TIME_relative_get_forever();
1902 new_address->neighbor = neighbor;
1903 new_address->plugin = head->plugin;
1904 new_address->transmit_ready = GNUNET_YES;
1905 new_address->timeout = GNUNET_TIME_relative_to_absolute
1906 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT); /* FIXME: Do we need this? */
1907 new_address->ready_list = head;
1908 new_address->next = head->addresses;
1909 head->addresses = new_address;
1916 static struct PeerAddressList *
1917 find_peer_address(struct NeighborList *neighbor, const char *addr, size_t addrlen)
1919 struct ReadyList *head = neighbor->plugins;
1920 struct PeerAddressList *address_head;
1921 while (head != NULL)
1923 address_head = head->addresses;
1924 while ((address_head != NULL) &&
1925 (address_head->addrlen != addrlen) &&
1926 (memcmp(address_head->addr, addr, addrlen) != 0))
1928 address_head = address_head->next;
1930 if (address_head != NULL)
1931 return address_head;
1939 * Append the given address to the list of entries
1940 * that need to be validated.
1943 run_validation (void *cls,
1945 struct GNUNET_TIME_Absolute expiration,
1946 const void *addr, size_t addrlen)
1948 struct ValidationList *e = cls;
1949 struct TransportPlugin *tp;
1950 struct ValidationAddress *va;
1951 struct GNUNET_PeerIdentity id;
1952 struct NeighborList *neighbor;
1953 struct PeerAddressList *peer_address;
1955 struct TransportPingMessage *ping;
1960 tp = find_transport (tname);
1963 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
1964 GNUNET_ERROR_TYPE_BULK,
1966 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
1970 GNUNET_CRYPTO_hash (&e->publicKey,
1972 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
1975 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1976 "Scheduling validation of address `%s' via `%s' for `%4s'\n",
1977 GNUNET_a2s (addr, addrlen), tname, GNUNET_i2s (&id));
1979 va = GNUNET_malloc (sizeof (struct ValidationAddress));
1980 va->next = e->addresses;
1982 va->transport_name = GNUNET_strdup (tname);
1983 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1985 va->send_time = GNUNET_TIME_absolute_get();
1987 neighbor = find_neighbor(&id);
1989 if (neighbor == NULL)
1990 neighbor = setup_new_neighbor(&id);
1992 peer_address = find_peer_address(neighbor, addr, addrlen);
1993 if (peer_address == NULL)
1995 peer_address = add_peer_address(neighbor, addr, addrlen);
1998 GNUNET_assert(peer_address != NULL);
2000 va->peer_address = peer_address; /* Back pointer FIXME: remove this nonsense! */
2001 peer_address->validation = va;
2003 hello_size = GNUNET_HELLO_size(our_hello);
2004 tsize = sizeof(struct TransportPingMessage) + hello_size;
2006 message_buf = GNUNET_malloc(tsize);
2008 ping = GNUNET_malloc(sizeof(struct TransportPingMessage));
2009 ping->challenge = htonl(va->challenge);
2010 ping->header.size = htons(sizeof(struct TransportPingMessage));
2011 ping->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
2012 memcpy(&ping->target, &id, sizeof(struct GNUNET_PeerIdentity));
2015 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "hello size is %d, ping size is %d, total size is %d\n", hello_size, sizeof(struct TransportPingMessage), tsize);
2017 memcpy(message_buf, our_hello, hello_size);
2018 memcpy(&message_buf[hello_size], ping, sizeof(struct TransportPingMessage));
2021 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending ping message of size %d to address `%s' via `%s' for `%4s'\n",
2022 tsize, GNUNET_a2s (addr, addrlen), tname, GNUNET_i2s (&id));
2024 sent = transmit_to_peer(NULL, peer_address, GNUNET_SCHEDULER_PRIORITY_DEFAULT,
2025 message_buf, tsize, GNUNET_NO, neighbor);
2028 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transport returned %d from send!\n", sent);
2032 GNUNET_free(message_buf);
2038 * @param cls handle to the plugin (for sending)
2039 * @param target the peer identity of the peer we are sending to
2040 * @param challenge the challenge number
2041 * @param timeout how long to await validation?
2042 * @param addr the address to validate
2043 * @param addrlen the length of the address
2045 * Perform address validation, which means sending a PING PONG to
2046 * the address via the transport plugin. If not validated, then
2047 * do not count this as a good peer/address...
2049 * Currently this function is not used, ping/pongs get sent from the
2050 * run_validation function. Haven't decided yet how to do this.
2053 validate_address (void *cls, struct ValidationAddress *va,
2054 const struct GNUNET_PeerIdentity *target,
2055 struct GNUNET_TIME_Relative timeout,
2056 const void *addr, size_t addrlen)
2058 /* struct Plugin *plugin = cls;
2059 int challenge = va->challenge; */
2067 * Check if addresses in validated hello "h" overlap with
2068 * those in "chvc->hello" and update "chvc->hello" accordingly,
2069 * removing those addresses that have already been validated.
2072 check_hello_validated (void *cls,
2073 const struct GNUNET_PeerIdentity *peer,
2074 const struct GNUNET_HELLO_Message *h, uint32_t trust)
2076 struct CheckHelloValidatedContext *chvc = cls;
2077 struct ValidationAddress *va;
2078 struct TransportPlugin *tp;
2081 struct GNUNET_PeerIdentity apeer;
2083 first_call = GNUNET_NO;
2084 if (chvc->e == NULL)
2087 first_call = GNUNET_YES;
2088 chvc->e = GNUNET_malloc (sizeof (struct ValidationList));
2089 GNUNET_assert (GNUNET_OK ==
2090 GNUNET_HELLO_get_key (h != NULL ? h : chvc->hello,
2091 &chvc->e->publicKey));
2093 GNUNET_TIME_relative_to_absolute (HELLO_VERIFICATION_TIMEOUT);
2094 chvc->e->next = pending_validations;
2095 pending_validations = chvc->e;
2100 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
2102 GNUNET_TIME_absolute_get (),
2103 &run_validation, chvc->e);
2105 else if (GNUNET_YES == first_call)
2107 /* no existing HELLO, all addresses are new */
2108 GNUNET_HELLO_iterate_addresses (chvc->hello,
2109 GNUNET_NO, &run_validation, chvc->e);
2113 return; /* wait for next call */
2114 /* finally, transmit validation attempts */
2115 GNUNET_assert (GNUNET_OK == GNUNET_HELLO_get_id (chvc->hello, &apeer));
2117 va = chvc->e->addresses;
2122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2123 "Establishing `%s' connection to validate `%s' address `%s' of `%4s'\n",
2126 GNUNET_a2s ((const struct sockaddr *) va->peer_address->addr,
2127 va->peer_address->addrlen), GNUNET_i2s (&apeer));
2129 tp = find_transport (va->transport_name);
2130 GNUNET_assert (tp != NULL);
2131 /* This validation should happen inside the transport, not from the plugin! */
2132 va->ok = GNUNET_SYSERR;
2137 GNUNET_SCHEDULER_add_delayed (sched,
2138 GNUNET_TIME_absolute_get_remaining (chvc->
2140 &cleanup_validation, NULL);
2146 * Process HELLO-message.
2148 * @param plugin transport involved, may be NULL
2149 * @param message the actual message
2150 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
2153 process_hello (struct TransportPlugin *plugin,
2154 const struct GNUNET_MessageHeader *message)
2156 struct ValidationList *e;
2158 struct GNUNET_PeerIdentity target;
2159 const struct GNUNET_HELLO_Message *hello;
2160 struct CheckHelloValidatedContext *chvc;
2161 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
2163 hsize = ntohs (message->size);
2164 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
2165 (hsize < sizeof (struct GNUNET_MessageHeader)))
2168 return GNUNET_SYSERR;
2170 /* first, check if load is too high */
2171 if (GNUNET_OS_load_cpu_get (cfg) > 100)
2173 /* TODO: call to stats? */
2176 hello = (const struct GNUNET_HELLO_Message *) message;
2177 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
2179 GNUNET_break_op (0);
2180 return GNUNET_SYSERR;
2182 GNUNET_CRYPTO_hash (&publicKey,
2183 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2184 &target.hashPubKey);
2186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2187 "Processing `%s' message for `%4s' of size %d (hsize is %d)\n",
2188 "HELLO", GNUNET_i2s (&target), GNUNET_HELLO_size(hello), hsize);
2192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2193 "Notifying peerinfo about peer %s\n",
2194 GNUNET_i2s (&target));
2197 /* check if a HELLO for this peer is already on the validation list */
2198 e = pending_validations;
2201 if (0 == memcmp (&e->publicKey,
2204 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded)))
2206 /* TODO: call to stats? */
2208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2209 "`%s' message for peer `%4s' is already pending; ignoring new message\n",
2210 "HELLO", GNUNET_i2s (&target));
2216 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
2217 chvc->plugin = plugin;
2218 chvc->hello = (struct GNUNET_HELLO_Message *) &chvc[1];
2220 memcpy (chvc->hello, hello, hsize);
2221 /* finally, check if HELLO was previously validated
2222 (continuation will then schedule actual validation) */
2223 chvc->piter = GNUNET_PEERINFO_iterate (cfg,
2227 HELLO_VERIFICATION_TIMEOUT,
2228 &check_hello_validated, chvc);
2234 * The peer specified by the given neighbor has timed-out or a plugin
2235 * has disconnected. We may either need to do nothing (other plugins
2236 * still up), or trigger a full disconnect and clean up. This
2237 * function updates our state and does the necessary notifications.
2238 * Also notifies our clients that the neighbor is now officially
2241 * @param n the neighbor list entry for the peer
2242 * @param check should we just check if all plugins
2243 * disconnected or must we ask all plugins to
2247 disconnect_neighbor (struct NeighborList *current_handle, int check)
2249 struct ReadyList *rpos;
2250 struct NeighborList *npos;
2251 struct NeighborList *nprev;
2252 struct NeighborList *n;
2253 struct MessageQueue *mq;
2254 struct PeerAddressList *peer_addresses;
2255 struct PeerAddressList *peer_pos;
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);
2314 while (rpos->addresses != NULL)
2316 peer_pos = rpos->addresses;
2317 rpos->addresses = peer_pos->next;
2318 GNUNET_free(peer_pos->addr);
2319 GNUNET_free(peer_pos);
2324 /* free all messages on the queue */
2325 while (NULL != (mq = n->messages))
2327 n->messages = mq->next;
2328 GNUNET_assert (0 == memcmp(mq->neighbor_id, &n->id, sizeof(struct GNUNET_PeerIdentity)));
2329 GNUNET_free (mq->neighbor_id);
2332 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
2333 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
2334 /* finally, free n itself */
2340 * We have received a PING message from someone. Need to send a PONG message
2341 * in response to the peer by any means necessary. Of course, with something
2342 * like TCP where a connection exists, we may want to send it that way. But
2343 * we may not be able to make that distinction...
2345 static int handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
2346 const struct GNUNET_PeerIdentity *peer,
2347 const char *sender_address,
2348 size_t sender_address_len)
2350 struct TransportPlugin *plugin = cls;
2351 struct TransportPingMessage *ping;
2352 struct TransportPongMessage *pong;
2353 struct PeerAddressList *peer_address;
2355 struct NeighborList *n;
2358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2359 "Processing `%s' from `%s'\n",
2360 "PING", GNUNET_a2s ((const struct sockaddr *)sender_address, sender_address_len));
2363 msize = ntohs (message->size);
2364 if (msize < sizeof (struct TransportPingMessage))
2366 GNUNET_break_op (0);
2367 return GNUNET_SYSERR;
2369 ping = (struct TransportPingMessage *) message;
2370 if (0 != memcmp (&ping->target,
2371 plugin->env.my_identity,
2372 sizeof (struct GNUNET_PeerIdentity)))
2374 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2375 _("Received `%s' message not destined for me!\n"), "PING");
2376 return GNUNET_SYSERR;
2379 msize -= sizeof (struct TransportPingMessage);
2381 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len);
2382 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len);
2383 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
2384 pong->purpose.size =
2385 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2387 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sender_address_len);
2388 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_TCP_PING);
2389 pong->challenge = ping->challenge;
2390 pong->addrlen = htons(sender_address_len);
2392 memcpy(&pong->signer, &my_public_key, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2393 memcpy (&pong[1], sender_address, sender_address_len);
2394 GNUNET_assert (GNUNET_OK ==
2395 GNUNET_CRYPTO_rsa_sign (my_private_key,
2396 &pong->purpose, &pong->signature));
2398 n = find_neighbor(peer);
2400 n = setup_new_neighbor(peer);
2402 peer_address = find_peer_address(n, sender_address, sender_address_len);
2403 if (peer_address == NULL)
2404 peer_address = add_peer_address(n, sender_address, sender_address_len);
2406 peer_address->timeout = GNUNET_TIME_relative_to_absolute(GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2408 /* We don't use the peer_address because the address we received the message from may not
2409 * be a reliable way to send it back! We add it to the list which should queue up a separate
2410 * ping to determine if the address is viable.
2412 transmit_to_peer(NULL, NULL, TRANSPORT_DEFAULT_PRIORITY, (char *)pong, ntohs(pong->header.size), GNUNET_NO, n);
2419 * Function called by the plugin for each received message.
2420 * Update data volumes, possibly notify plugins about
2421 * reducing the rate at which they read from the socket
2422 * and generally forward to our receive callback.
2424 * @param cls the "struct TransportPlugin *" we gave to the plugin
2425 * @param message the message, NULL if peer was disconnected
2426 * @param distance the transport cost to this peer (not latency!)
2427 * @param sender_address the address that the sender reported
2428 * (opaque to transport service)
2429 * @param sender_address_len the length of the sender address
2430 * @param peer (claimed) identity of the other peer
2431 * @return the new service_context that the plugin should use
2432 * for future receive calls for messages from this
2437 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
2438 const struct GNUNET_MessageHeader *message,
2439 unsigned int distance, const char *sender_address,
2440 size_t sender_address_len)
2442 struct ReadyList *service_context;
2443 struct TransportPlugin *plugin = cls;
2444 struct TransportClient *cpos;
2445 struct InboundMessage *im;
2446 struct PeerAddressList *peer_address;
2448 struct NeighborList *n;
2450 n = find_neighbor (peer);
2453 if (message == NULL)
2454 return; /* disconnect of peer already marked down */
2455 n = setup_new_neighbor (peer);
2459 peer_address = find_peer_address(n, sender_address, sender_address_len);
2460 if (peer_address == NULL)
2461 peer_address = add_peer_address(n, sender_address, sender_address_len);
2463 service_context = n->plugins;
2464 while ((service_context != NULL) && (plugin != service_context->plugin))
2465 service_context = service_context->next;
2466 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
2467 if (message == NULL)
2470 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2471 "Receive failed from `%4s', triggering disconnect\n",
2472 GNUNET_i2s (&n->id));
2474 /* TODO: call stats */
2475 if (service_context != NULL)
2476 service_context->connected = GNUNET_NO;
2477 disconnect_neighbor (n, GNUNET_YES);
2481 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2482 "Processing message of type `%u' received by plugin...\n",
2483 ntohs (message->type));
2485 if (service_context != NULL)
2487 if (service_context->connected == GNUNET_NO)
2489 /*service_context->connected = GNUNET_YES;*/
2490 /* FIXME: What to do here? Should we use these as well, to specify some Address
2491 * in the AddressList should be available?
2493 peer_address->transmit_ready = GNUNET_YES;
2494 peer_address->connect_attempts++;
2496 peer_address->timeout
2498 GNUNET_TIME_relative_to_absolute
2499 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2501 /* update traffic received amount ... */
2502 msize = ntohs (message->size);
2503 n->last_received += msize;
2504 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
2506 GNUNET_TIME_relative_to_absolute
2507 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2509 GNUNET_SCHEDULER_add_delayed (sched,
2510 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2511 &neighbor_timeout_task, n);
2513 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
2515 /* dropping message due to frequent inbound volume violations! */
2516 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
2517 GNUNET_ERROR_TYPE_BULK,
2519 ("Dropping incoming message due to repeated bandwidth quota violations (total of %u).\n"), n->quota_violation_count);
2520 /* TODO: call stats */
2521 GNUNET_assert ((service_context == NULL) ||
2522 (NULL != service_context->neighbor));
2526 switch (ntohs (message->type))
2528 case GNUNET_MESSAGE_TYPE_HELLO:
2530 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2531 "Receiving `%s' message from `%4s'.\n", "HELLO",
2534 process_hello (plugin, message);
2536 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
2538 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2539 "Receiving `%s' message from `%4s'.\n", "PING",
2542 handle_ping(plugin, message, peer, sender_address, sender_address_len);
2544 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
2546 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2547 "Receiving `%s' message from `%4s'.\n", "PONG",
2550 handle_pong(plugin, message, peer, sender_address, sender_address_len);
2554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2555 "Received REAL MESSAGE type %u from `%4s', sending to all clients.\n",
2556 ntohs (message->type), GNUNET_i2s (peer));
2558 /* transmit message to all clients */
2559 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
2560 im->header.size = htons (sizeof (struct InboundMessage) + msize);
2561 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
2562 im->latency = n->latency;
2564 memcpy (&im[1], message, msize);
2567 while (cpos != NULL)
2569 transmit_to_client (cpos, &im->header, GNUNET_YES);
2574 GNUNET_assert ((service_context == NULL) ||
2575 (NULL != service_context->neighbor));
2580 * Handle START-message. This is the first message sent to us
2581 * by any client which causes us to add it to our list.
2583 * @param cls closure (always NULL)
2584 * @param client identification of the client
2585 * @param message the actual message
2588 handle_start (void *cls,
2589 struct GNUNET_SERVER_Client *client,
2590 const struct GNUNET_MessageHeader *message)
2592 struct TransportClient *c;
2593 struct ConnectInfoMessage cim;
2594 struct NeighborList *n;
2595 struct InboundMessage *im;
2596 struct GNUNET_MessageHeader *ack;
2599 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2600 "Received `%s' request from client\n", "START");
2605 if (c->client == client)
2607 /* client already on our list! */
2609 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2614 c = GNUNET_malloc (sizeof (struct TransportClient));
2618 if (our_hello != NULL)
2621 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2622 "Sending our own `%s' to new client\n", "HELLO");
2624 transmit_to_client (c,
2625 (const struct GNUNET_MessageHeader *) our_hello,
2627 /* tell new client about all existing connections */
2628 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2629 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2631 htonl (GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT / (60 * 1000));
2632 cim.latency = GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_ZERO); /* FIXME? */
2633 im = GNUNET_malloc (sizeof (struct InboundMessage) +
2634 sizeof (struct GNUNET_MessageHeader));
2635 im->header.size = htons (sizeof (struct InboundMessage) +
2636 sizeof (struct GNUNET_MessageHeader));
2637 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
2638 im->latency = GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_ZERO); /* FIXME? */
2639 ack = (struct GNUNET_MessageHeader *) &im[1];
2640 ack->size = htons (sizeof (struct GNUNET_MessageHeader));
2641 ack->type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ACK);
2642 for (n = neighbors; n != NULL; n = n->next)
2645 transmit_to_client (c, &cim.header, GNUNET_NO);
2646 if (n->received_pong)
2649 transmit_to_client (c, &im->header, GNUNET_NO);
2656 fprintf(stderr, "Our hello is NULL!\n");
2658 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2663 * Handle HELLO-message.
2665 * @param cls closure (always NULL)
2666 * @param client identification of the client
2667 * @param message the actual message
2670 handle_hello (void *cls,
2671 struct GNUNET_SERVER_Client *client,
2672 const struct GNUNET_MessageHeader *message)
2677 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2678 "Received `%s' request from client\n", "HELLO");
2680 ret = process_hello (NULL, message);
2681 GNUNET_SERVER_receive_done (client, ret);
2686 * Handle SEND-message.
2688 * @param cls closure (always NULL)
2689 * @param client identification of the client
2690 * @param message the actual message
2693 handle_send (void *cls,
2694 struct GNUNET_SERVER_Client *client,
2695 const struct GNUNET_MessageHeader *message)
2697 struct TransportClient *tc;
2698 struct NeighborList *n;
2699 const struct OutboundMessage *obm;
2700 const struct GNUNET_MessageHeader *obmm;
2704 size = ntohs (message->size);
2706 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
2709 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2712 obm = (const struct OutboundMessage *) message;
2714 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2715 "Received `%s' request from client with target `%4s'\n",
2716 "SEND", GNUNET_i2s (&obm->peer));
2718 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
2719 msize = ntohs (obmm->size);
2720 if (size != msize + sizeof (struct OutboundMessage))
2723 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2726 n = find_neighbor (&obm->peer);
2728 n = setup_new_neighbor (&obm->peer); /* But won't ever add address, we have none! */
2730 while ((tc != NULL) && (tc->client != client))
2734 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2735 "Client asked to transmit %u-byte message of type %u to `%4s'\n",
2737 ntohs (obmm->type), GNUNET_i2s (&obm->peer));
2739 transmit_to_peer (tc, NULL, ntohl (obm->priority), (char *)obmm, ntohs (obmm->size), GNUNET_NO, n);
2740 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2745 * Handle SET_QUOTA-message.
2747 * @param cls closure (always NULL)
2748 * @param client identification of the client
2749 * @param message the actual message
2752 handle_set_quota (void *cls,
2753 struct GNUNET_SERVER_Client *client,
2754 const struct GNUNET_MessageHeader *message)
2756 const struct QuotaSetMessage *qsm =
2757 (const struct QuotaSetMessage *) message;
2758 struct NeighborList *n;
2759 struct TransportPlugin *p;
2760 struct ReadyList *rl;
2762 n = find_neighbor (&qsm->peer);
2765 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2770 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2771 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
2772 "SET_QUOTA", ntohl(qsm->quota_in), n->quota_in, GNUNET_i2s (&qsm->peer));
2776 if (n->quota_in < ntohl (qsm->quota_in))
2777 n->last_quota_update = GNUNET_TIME_absolute_get ();
2778 n->quota_in = ntohl (qsm->quota_in);
2783 p->api->set_receive_quota (p->api->cls,
2784 &qsm->peer, ntohl (qsm->quota_in));
2787 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2792 * Handle TRY_CONNECT-message.
2794 * @param cls closure (always NULL)
2795 * @param client identification of the client
2796 * @param message the actual message
2799 handle_try_connect (void *cls,
2800 struct GNUNET_SERVER_Client *client,
2801 const struct GNUNET_MessageHeader *message)
2803 const struct TryConnectMessage *tcm;
2804 struct NeighborList *neighbor;
2805 tcm = (const struct TryConnectMessage *) message;
2807 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2808 "Received `%s' request from client %p asking to connect to `%4s'\n",
2809 "TRY_CONNECT", client, GNUNET_i2s (&tcm->peer));
2811 neighbor = find_neighbor(&tcm->peer);
2813 if (neighbor == NULL)
2814 setup_new_neighbor (&tcm->peer);
2818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2819 "Client asked to connect to `%4s', but connection already exists\n",
2820 "TRY_CONNECT", GNUNET_i2s (&tcm->peer));
2822 transmit_to_peer (NULL, NULL, 0,
2823 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2824 GNUNET_YES, neighbor);
2825 notify_clients_connect (&tcm->peer, GNUNET_TIME_UNIT_FOREVER_REL);
2827 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2831 transmit_address_to_client (void *cls, const char *address)
2833 struct GNUNET_SERVER_TransmitContext *tc = cls;
2836 if (NULL == address)
2839 slen = strlen (address) + 1;
2840 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
2841 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
2842 if (NULL == address)
2843 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
2847 * Handle AddressLookup-message.
2849 * @param cls closure (always NULL)
2850 * @param client identification of the client
2851 * @param message the actual message
2854 handle_address_lookup (void *cls,
2855 struct GNUNET_SERVER_Client *client,
2856 const struct GNUNET_MessageHeader *message)
2858 const struct AddressLookupMessage *alum;
2859 struct TransportPlugin *lsPlugin;
2860 const char *nameTransport;
2861 const char *address;
2863 struct GNUNET_SERVER_TransmitContext *tc;
2865 size = ntohs (message->size);
2866 if (size < sizeof (struct AddressLookupMessage))
2868 GNUNET_break_op (0);
2869 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2872 alum = (const struct AddressLookupMessage *) message;
2873 uint32_t addressLen = ntohl (alum->addrlen);
2874 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
2876 GNUNET_break_op (0);
2877 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2880 address = (const char *) &alum[1];
2881 nameTransport = (const char *) &address[addressLen];
2883 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
2885 GNUNET_break_op (0);
2886 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2889 struct GNUNET_TIME_Absolute timeout =
2890 GNUNET_TIME_absolute_ntoh (alum->timeout);
2891 struct GNUNET_TIME_Relative rtimeout =
2892 GNUNET_TIME_absolute_get_remaining (timeout);
2893 lsPlugin = find_transport (nameTransport);
2894 if (NULL == lsPlugin)
2896 tc = GNUNET_SERVER_transmit_context_create (client);
2897 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
2898 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
2899 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
2902 tc = GNUNET_SERVER_transmit_context_create (client);
2903 lsPlugin->api->address_pretty_printer (cls, nameTransport,
2904 address, addressLen, GNUNET_YES,
2906 &transmit_address_to_client, tc);
2910 * List of handlers for the messages understood by this
2913 static struct GNUNET_SERVER_MessageHandler handlers[] = {
2914 {&handle_start, NULL,
2915 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
2916 {&handle_hello, NULL,
2917 GNUNET_MESSAGE_TYPE_HELLO, 0},
2918 {&handle_send, NULL,
2919 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
2920 {&handle_set_quota, NULL,
2921 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
2922 {&handle_try_connect, NULL,
2923 GNUNET_MESSAGE_TYPE_TRANSPORT_TRY_CONNECT,
2924 sizeof (struct TryConnectMessage)},
2925 {&handle_address_lookup, NULL,
2926 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
2933 * Setup the environment for this plugin.
2936 create_environment (struct TransportPlugin *plug)
2938 plug->env.cfg = cfg;
2939 plug->env.sched = sched;
2940 plug->env.my_identity = &my_identity;
2941 plug->env.cls = plug;
2942 plug->env.receive = &plugin_env_receive;
2943 plug->env.notify_address = &plugin_env_notify_address;
2944 plug->env.default_quota_in =
2945 (GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT + 59999) / (60 * 1000);
2946 plug->env.max_connections = max_connect_per_transport;
2951 * Start the specified transport (load the plugin).
2954 start_transport (struct GNUNET_SERVER_Handle *server, const char *name)
2956 struct TransportPlugin *plug;
2959 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2960 _("Loading `%s' transport plugin\n"), name);
2961 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
2962 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
2963 create_environment (plug);
2964 plug->short_name = GNUNET_strdup (name);
2965 plug->lib_name = libname;
2966 plug->next = plugins;
2968 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
2969 if (plug->api == NULL)
2971 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2972 _("Failed to load transport plugin for `%s'\n"), name);
2973 GNUNET_free (plug->short_name);
2974 plugins = plug->next;
2975 GNUNET_free (libname);
2982 * Called whenever a client is disconnected. Frees our
2983 * resources associated with that client.
2985 * @param cls closure
2986 * @param client identification of the client
2989 client_disconnect_notification (void *cls,
2990 struct GNUNET_SERVER_Client *client)
2992 struct TransportClient *pos;
2993 struct TransportClient *prev;
2994 struct ClientMessageQueueEntry *mqe;
2999 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
3000 "Client disconnected, cleaning up.\n");
3004 while ((pos != NULL) && (pos->client != client))
3011 while (NULL != (mqe = pos->message_queue_head))
3013 pos->message_queue_head = mqe->next;
3016 pos->message_queue_head = NULL;
3018 clients = pos->next;
3020 prev->next = pos->next;
3021 if (GNUNET_YES == pos->tcs_pending)
3031 * Function called when the service shuts down. Unloads our plugins.
3033 * @param cls closure, unused
3034 * @param tc task context (unused)
3037 unload_plugins (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3039 struct TransportPlugin *plug;
3040 struct AddressList *al;
3043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3044 "Transport service is unloading plugins...\n");
3046 while (NULL != (plug = plugins))
3048 plugins = plug->next;
3049 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
3050 GNUNET_free (plug->lib_name);
3051 GNUNET_free (plug->short_name);
3052 while (NULL != (al = plug->addresses))
3054 plug->addresses = al->next;
3059 if (my_private_key != NULL)
3060 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3061 GNUNET_free_non_null (our_hello);
3066 * Initiate transport service.
3068 * @param cls closure
3069 * @param s scheduler to use
3070 * @param serv the initialized server
3071 * @param c configuration to use
3075 struct GNUNET_SCHEDULER_Handle *s,
3076 struct GNUNET_SERVER_Handle *serv,
3077 const struct GNUNET_CONFIGURATION_Handle *c)
3082 unsigned long long tneigh;
3087 /* parse configuration */
3089 GNUNET_CONFIGURATION_get_value_number (c,
3094 GNUNET_CONFIGURATION_get_value_filename (c,
3096 "HOSTKEY", &keyfile)))
3098 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3100 ("Transport service is lacking key configuration settings. Exiting.\n"));
3101 GNUNET_SCHEDULER_shutdown (s);
3104 max_connect_per_transport = (uint32_t) tneigh;
3105 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3106 GNUNET_free (keyfile);
3107 if (my_private_key == NULL)
3109 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3111 ("Transport service could not access hostkey. Exiting.\n"));
3112 GNUNET_SCHEDULER_shutdown (s);
3115 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3116 GNUNET_CRYPTO_hash (&my_public_key,
3117 sizeof (my_public_key), &my_identity.hashPubKey);
3118 /* setup notification */
3120 GNUNET_SERVER_disconnect_notify (server,
3121 &client_disconnect_notification, NULL);
3122 /* load plugins... */
3125 GNUNET_CONFIGURATION_get_value_string (c,
3126 "TRANSPORT", "PLUGINS", &plugs))
3128 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3129 _("Starting transport plugins `%s'\n"), plugs);
3130 pos = strtok (plugs, " ");
3133 start_transport (server, pos);
3135 pos = strtok (NULL, " ");
3137 GNUNET_free (plugs);
3139 GNUNET_SCHEDULER_add_delayed (sched,
3140 GNUNET_TIME_UNIT_FOREVER_REL,
3141 &unload_plugins, NULL);
3146 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
3148 /* process client requests */
3149 GNUNET_SERVER_add_handlers (server, handlers);
3154 * The main function for the transport service.
3156 * @param argc number of arguments from the command line
3157 * @param argv command line arguments
3158 * @return 0 ok, 1 on error
3161 main (int argc, char *const *argv)
3163 return (GNUNET_OK ==
3164 GNUNET_SERVICE_run (argc,
3167 GNUNET_SERVICE_OPTION_NONE,
3168 &run, NULL)) ? 0 : 1;
3171 /* end of gnunet-service-transport.c */