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3 Copyright (C) 2001-2013, 2017 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
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13 Affero General Public License for more details.
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18 SPDX-License-Identifier: AGPL3.0-or-later
22 * @file cadet/gnunet-service-cadet.c
23 * @brief GNUnet CADET service with encryption
24 * @author Bartlomiej Polot
25 * @author Christian Grothoff
28 * - peer: other cadet instance. If there is direct connection it's a neighbor.
29 * - path: series of directly connected peer from one peer to another.
30 * - connection: path which is being used in a tunnel.
31 * - tunnel: encrypted connection to a peer, neighbor or not.
32 * - channel: logical link between two clients, on the same or different peers.
33 * have properties like reliability.
37 #include "gnunet_util_lib.h"
39 #include "gnunet_statistics_service.h"
40 #include "gnunet-service-cadet.h"
41 #include "gnunet-service-cadet_channel.h"
42 #include "gnunet-service-cadet_connection.h"
43 #include "gnunet-service-cadet_core.h"
44 #include "gnunet-service-cadet_dht.h"
45 #include "gnunet-service-cadet_hello.h"
46 #include "gnunet-service-cadet_tunnels.h"
47 #include "gnunet-service-cadet_peer.h"
48 #include "gnunet-service-cadet_paths.h"
50 #define LOG(level, ...) GNUNET_log (level,__VA_ARGS__)
54 * Struct containing information about a client of the service
61 struct CadetClient *next;
66 struct CadetClient *prev;
69 * Tunnels that belong to this client, indexed by local id,
70 * value is a `struct CadetChannel`.
72 struct GNUNET_CONTAINER_MultiHashMap32 *channels;
75 * Handle to communicate with the client
77 struct GNUNET_MQ_Handle *mq;
82 struct GNUNET_SERVICE_Client *client;
85 * Ports that this client has declared interest in.
86 * Indexed by port, contains `struct OpenPort`
88 struct GNUNET_CONTAINER_MultiHashMap *ports;
91 * Channel ID to use for the next incoming channel for this client.
92 * Wraps around (in theory).
94 struct GNUNET_CADET_ClientChannelNumber next_ccn;
97 * ID of the client, mainly for debug messages. Purely internal to this file.
103 /******************************************************************************/
104 /*********************** GLOBAL VARIABLES ****************************/
105 /******************************************************************************/
107 /****************************** Global variables ******************************/
110 * Handle to our configuration.
112 const struct GNUNET_CONFIGURATION_Handle *cfg;
115 * Handle to the statistics service.
117 struct GNUNET_STATISTICS_Handle *stats;
120 * Handle to communicate with ATS.
122 struct GNUNET_ATS_ConnectivityHandle *ats_ch;
127 struct GNUNET_PeerIdentity my_full_id;
132 struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
135 * Signal that shutdown is happening: prevent recovery measures.
140 * DLL with all the clients, head.
142 static struct CadetClient *clients_head;
145 * DLL with all the clients, tail.
147 static struct CadetClient *clients_tail;
150 * Next ID to assign to a client.
152 static unsigned int next_client_id;
155 * All ports clients of this peer have opened. Maps from
156 * a hashed port to a `struct OpenPort`.
158 struct GNUNET_CONTAINER_MultiHashMap *open_ports;
161 * Map from ports to channels where the ports were closed at the
162 * time we got the inbound connection.
163 * Indexed by h_port, contains `struct CadetChannel`.
165 struct GNUNET_CONTAINER_MultiHashMap *loose_channels;
168 * Map from PIDs to `struct CadetPeer` entries.
170 struct GNUNET_CONTAINER_MultiPeerMap *peers;
173 * Map from `struct GNUNET_CADET_ConnectionTunnelIdentifier`
174 * hash codes to `struct CadetConnection` objects.
176 struct GNUNET_CONTAINER_MultiShortmap *connections;
179 * How many messages are needed to trigger an AXOLOTL ratchet advance.
181 unsigned long long ratchet_messages;
184 * How long until we trigger a ratched advance due to time.
186 struct GNUNET_TIME_Relative ratchet_time;
189 * How frequently do we send KEEPALIVE messages on idle connections?
191 struct GNUNET_TIME_Relative keepalive_period;
194 * Set to non-zero values to create random drops to test retransmissions.
196 unsigned long long drop_percent;
200 * Send a message to a client.
202 * @param c client to get the message
203 * @param env envelope with the message
206 GSC_send_to_client (struct CadetClient *c,
207 struct GNUNET_MQ_Envelope *env)
209 GNUNET_MQ_send (c->mq,
215 * Return identifier for a client as a string.
217 * @param c client to identify
218 * @return string for debugging
221 GSC_2s (struct CadetClient *c)
225 GNUNET_snprintf (buf,
234 * Lookup channel of client @a c by @a ccn.
236 * @param c client to look in
237 * @param ccn channel ID to look up
238 * @return NULL if no such channel exists
240 static struct CadetChannel *
241 lookup_channel (struct CadetClient *c,
242 struct GNUNET_CADET_ClientChannelNumber ccn)
244 return GNUNET_CONTAINER_multihashmap32_get (c->channels,
245 ntohl (ccn.channel_of_client));
250 * Obtain the next LID to use for incoming connections to
253 * @param c client handle
255 static struct GNUNET_CADET_ClientChannelNumber
256 client_get_next_ccn (struct CadetClient *c)
258 struct GNUNET_CADET_ClientChannelNumber ccn = c->next_ccn;
260 /* increment until we have a free one... */
265 ccn.channel_of_client
266 = htonl (1 + (ntohl (ccn.channel_of_client)));
267 if (ntohl (ccn.channel_of_client) >=
268 GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
269 ccn.channel_of_client = htonl (0);
271 c->next_ccn.channel_of_client
272 = htonl (1 + (ntohl (ccn.channel_of_client)));
278 * Bind incoming channel to this client, and notify client about
279 * incoming connection. Caller is responsible for notifying the other
280 * peer about our acceptance of the channel.
282 * @param c client to bind to
283 * @param ch channel to be bound
284 * @param dest peer that establishes the connection
285 * @param port port number
286 * @param options options
287 * @return local channel number assigned to the new client
289 struct GNUNET_CADET_ClientChannelNumber
290 GSC_bind (struct CadetClient *c,
291 struct CadetChannel *ch,
292 struct CadetPeer *dest,
293 const struct GNUNET_HashCode *port,
296 struct GNUNET_MQ_Envelope *env;
297 struct GNUNET_CADET_LocalChannelCreateMessage *cm;
298 struct GNUNET_CADET_ClientChannelNumber ccn;
300 ccn = client_get_next_ccn (c);
301 GNUNET_assert (GNUNET_YES ==
302 GNUNET_CONTAINER_multihashmap32_put (c->channels,
303 ntohl (ccn.channel_of_client),
305 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
306 LOG (GNUNET_ERROR_TYPE_DEBUG,
307 "Accepting incoming %s from %s on open port %s (%u), assigning ccn %X\n",
311 (uint32_t) ntohl (options),
312 (uint32_t) ntohl (ccn.channel_of_client));
313 /* notify local client about incoming connection! */
314 env = GNUNET_MQ_msg (cm,
315 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_CREATE);
318 cm->opt = htonl (options);
319 cm->peer = *GCP_get_id (dest);
320 GSC_send_to_client (c,
327 * Callback invoked on all peers to destroy all tunnels
328 * that may still exist.
331 * @param pid identify of a peer
332 * @param value a `struct CadetPeer` that may still have a tunnel
333 * @return #GNUNET_OK (iterate over all entries)
336 destroy_tunnels_now (void *cls,
337 const struct GNUNET_PeerIdentity *pid,
340 struct CadetPeer *cp = value;
341 struct CadetTunnel *t = GCP_get_tunnel (cp,
345 GCT_destroy_tunnel_now (t);
351 * Callback invoked on all peers to destroy all tunnels
352 * that may still exist.
355 * @param pid identify of a peer
356 * @param value a `struct CadetPeer` that may still have a tunnel
357 * @return #GNUNET_OK (iterate over all entries)
360 destroy_paths_now (void *cls,
361 const struct GNUNET_PeerIdentity *pid,
364 struct CadetPeer *cp = value;
366 GCP_drop_owned_paths (cp);
372 * Shutdown everything once the clients have disconnected.
379 GNUNET_STATISTICS_destroy (stats,
383 /* Destroy tunnels. Note that all channels must be destroyed first! */
384 GCP_iterate_all (&destroy_tunnels_now,
386 /* All tunnels, channels, connections and CORE must be down before this point. */
387 GCP_iterate_all (&destroy_paths_now,
389 /* All paths, tunnels, channels, connections and CORE must be down before this point. */
390 GCP_destroy_all_peers ();
391 if (NULL != open_ports)
393 GNUNET_CONTAINER_multihashmap_destroy (open_ports);
396 if (NULL != loose_channels)
398 GNUNET_CONTAINER_multihashmap_destroy (loose_channels);
399 loose_channels = NULL;
403 GNUNET_CONTAINER_multipeermap_destroy (peers);
406 if (NULL != connections)
408 GNUNET_CONTAINER_multishortmap_destroy (connections);
413 GNUNET_ATS_connectivity_done (ats_ch);
418 GNUNET_free_non_null (my_private_key);
419 my_private_key = NULL;
424 * Task run during shutdown.
429 shutdown_task (void *cls)
431 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
433 shutting_down = GNUNET_YES;
435 if (NULL == clients_head)
441 * We had a remote connection @a value to port @a h_port before
442 * client @a cls opened port @a port. Bind them now.
444 * @param cls the `struct CadetClient`
445 * @param h_port the hashed port
446 * @param value the `struct CadetChannel`
447 * @return #GNUNET_YES (iterate over all such channels)
450 bind_loose_channel (void *cls,
451 const struct GNUNET_HashCode *port,
454 struct OpenPort *op = cls;
455 struct CadetChannel *ch = value;
460 GNUNET_assert (GNUNET_YES ==
461 GNUNET_CONTAINER_multihashmap_remove (loose_channels,
469 * Handle port open request. Creates a mapping from the
470 * port to the respective client and checks whether we have
471 * loose channels trying to bind to the port. If so, those
474 * @param cls Identification of the client.
475 * @param pmsg The actual message.
478 handle_port_open (void *cls,
479 const struct GNUNET_CADET_PortMessage *pmsg)
481 struct CadetClient *c = cls;
484 LOG (GNUNET_ERROR_TYPE_DEBUG,
485 "Open port %s requested by %s\n",
486 GNUNET_h2s (&pmsg->port),
488 if (NULL == c->ports)
489 c->ports = GNUNET_CONTAINER_multihashmap_create (4,
491 op = GNUNET_new (struct OpenPort);
493 op->port = pmsg->port;
494 GCCH_hash_port (&op->h_port,
498 GNUNET_CONTAINER_multihashmap_put (c->ports,
501 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
504 GNUNET_SERVICE_client_drop (c->client);
507 (void) GNUNET_CONTAINER_multihashmap_put (open_ports,
510 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
511 GNUNET_CONTAINER_multihashmap_get_multiple (loose_channels,
515 GNUNET_SERVICE_client_continue (c->client);
520 * Handler for port close requests. Marks this port as closed
521 * (unless of course we have another client with the same port
522 * open). Note that existing channels accepted on the port are
525 * @param cls Identification of the client.
526 * @param pmsg The actual message.
529 handle_port_close (void *cls,
530 const struct GNUNET_CADET_PortMessage *pmsg)
532 struct CadetClient *c = cls;
535 LOG (GNUNET_ERROR_TYPE_DEBUG,
536 "Closing port %s as requested by %s\n",
537 GNUNET_h2s (&pmsg->port),
539 if (NULL == c->ports)
541 /* Client closed a port despite _never_ having opened one? */
543 GNUNET_SERVICE_client_drop (c->client);
546 op = GNUNET_CONTAINER_multihashmap_get (c->ports,
551 GNUNET_SERVICE_client_drop (c->client);
554 GNUNET_assert (GNUNET_YES ==
555 GNUNET_CONTAINER_multihashmap_remove (c->ports,
558 GNUNET_assert (GNUNET_YES ==
559 GNUNET_CONTAINER_multihashmap_remove (open_ports,
563 GNUNET_SERVICE_client_continue (c->client);
568 * Handler for requests for us creating a new channel to another peer and port.
570 * @param cls Identification of the client.
571 * @param tcm The actual message.
574 handle_channel_create (void *cls,
575 const struct GNUNET_CADET_LocalChannelCreateMessage *tcm)
577 struct CadetClient *c = cls;
578 struct CadetChannel *ch;
580 if (ntohl (tcm->ccn.channel_of_client) < GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
582 /* Channel ID not in allowed range. */
584 GNUNET_SERVICE_client_drop (c->client);
587 ch = lookup_channel (c,
591 /* Channel ID already in use. Not allowed. */
593 GNUNET_SERVICE_client_drop (c->client);
596 LOG (GNUNET_ERROR_TYPE_DEBUG,
597 "New channel to %s at port %s requested by %s\n",
598 GNUNET_i2s (&tcm->peer),
599 GNUNET_h2s (&tcm->port),
603 ch = GCCH_channel_local_new (c,
612 GNUNET_SERVICE_client_drop (c->client);
615 GNUNET_assert (GNUNET_YES ==
616 GNUNET_CONTAINER_multihashmap32_put (c->channels,
617 ntohl (tcm->ccn.channel_of_client),
619 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
621 GNUNET_SERVICE_client_continue (c->client);
626 * Handler for requests of destroying an existing channel.
628 * @param cls client identification of the client
629 * @param msg the actual message
632 handle_channel_destroy (void *cls,
633 const struct GNUNET_CADET_LocalChannelDestroyMessage *msg)
635 struct CadetClient *c = cls;
636 struct CadetChannel *ch;
638 ch = lookup_channel (c,
642 /* Client attempted to destroy unknown channel.
643 Can happen if the other side went down at the same time.*/
644 LOG (GNUNET_ERROR_TYPE_DEBUG,
645 "%s tried to destroy unknown channel %X\n",
647 (uint32_t) ntohl (msg->ccn.channel_of_client));
648 GNUNET_SERVICE_client_continue (c->client);
651 LOG (GNUNET_ERROR_TYPE_DEBUG,
652 "%s is destroying %s\n",
655 GNUNET_assert (GNUNET_YES ==
656 GNUNET_CONTAINER_multihashmap32_remove (c->channels,
657 ntohl (msg->ccn.channel_of_client),
659 GCCH_channel_local_destroy (ch,
662 GNUNET_SERVICE_client_continue (c->client);
667 * Check for client traffic data message is well-formed.
669 * @param cls identification of the client
670 * @param msg the actual message
671 * @return #GNUNET_OK if @a msg is OK, #GNUNET_SYSERR if not
674 check_local_data (void *cls,
675 const struct GNUNET_CADET_LocalData *msg)
678 size_t payload_claimed_size;
680 struct GNUNET_MessageHeader pa;
682 /* FIXME: what is the format we shall allow for @a msg?
683 ONE payload item or multiple? Seems current cadet_api
684 at least in theory allows more than one. Next-gen
685 cadet_api will likely no more, so we could then
686 simplify this mess again. */
687 /* Sanity check for message size */
688 payload_size = ntohs (msg->header.size) - sizeof (*msg);
689 buf = (const char *) &msg[1];
690 while (payload_size >= sizeof (struct GNUNET_MessageHeader))
692 /* need to memcpy() for alignment */
696 payload_claimed_size = ntohs (pa.size);
697 if ( (payload_size < payload_claimed_size) ||
698 (payload_claimed_size < sizeof (struct GNUNET_MessageHeader)) ||
699 (GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE < payload_claimed_size) )
702 LOG (GNUNET_ERROR_TYPE_DEBUG,
703 "Local data of %u total size had sub-message %u at %u with %u bytes\n",
704 ntohs (msg->header.size),
706 (unsigned int) (buf - (const char *) &msg[1]),
707 (unsigned int) payload_claimed_size);
708 return GNUNET_SYSERR;
710 payload_size -= payload_claimed_size;
711 buf += payload_claimed_size;
713 if (0 != payload_size)
716 return GNUNET_SYSERR;
723 * Handler for client payload traffic to be send on a channel to
726 * @param cls identification of the client
727 * @param msg the actual message
730 handle_local_data (void *cls,
731 const struct GNUNET_CADET_LocalData *msg)
733 struct CadetClient *c = cls;
734 struct CadetChannel *ch;
738 ch = lookup_channel (c,
742 /* Channel does not exist (anymore) */
743 LOG (GNUNET_ERROR_TYPE_WARNING,
744 "Dropping payload for channel %u from client (channel unknown, other endpoint may have disconnected)\n",
745 (unsigned int) ntohl (msg->ccn.channel_of_client));
746 GNUNET_SERVICE_client_continue (c->client);
749 payload_size = ntohs (msg->header.size) - sizeof (*msg);
750 GNUNET_STATISTICS_update (stats,
751 "# payload received from clients",
754 buf = (const char *) &msg[1];
755 LOG (GNUNET_ERROR_TYPE_DEBUG,
756 "Received %u bytes payload from %s for %s\n",
757 (unsigned int) payload_size,
761 GCCH_handle_local_data (ch,
767 GNUNET_SERVICE_client_drop (c->client);
770 GNUNET_SERVICE_client_continue (c->client);
775 * Handler for client's ACKs for payload traffic.
777 * @param cls identification of the client.
778 * @param msg The actual message.
781 handle_local_ack (void *cls,
782 const struct GNUNET_CADET_LocalAck *msg)
784 struct CadetClient *c = cls;
785 struct CadetChannel *ch;
787 ch = lookup_channel (c,
791 /* Channel does not exist (anymore) */
792 LOG (GNUNET_ERROR_TYPE_WARNING,
793 "Ignoring local ACK for channel %u from client (channel unknown, other endpoint may have disconnected)\n",
794 (unsigned int) ntohl (msg->ccn.channel_of_client));
795 GNUNET_SERVICE_client_continue (c->client);
798 LOG (GNUNET_ERROR_TYPE_DEBUG,
799 "Got a local ACK from %s for %s\n",
802 GCCH_handle_local_ack (ch,
804 GNUNET_SERVICE_client_continue (c->client);
809 * Iterator over all peers to send a monitoring client info about each peer.
811 * @param cls Closure ().
812 * @param peer Peer ID (tunnel remote peer).
813 * @param value Peer info.
814 * @return #GNUNET_YES, to keep iterating.
817 get_all_peers_iterator (void *cls,
818 const struct GNUNET_PeerIdentity *peer,
821 struct CadetClient *c = cls;
822 struct CadetPeer *p = value;
823 struct GNUNET_MQ_Envelope *env;
824 struct GNUNET_CADET_LocalInfoPeers *msg;
826 env = GNUNET_MQ_msg (msg,
827 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS);
828 msg->destination = *peer;
829 msg->paths = htons (GCP_count_paths (p));
830 msg->tunnel = htons (NULL != GCP_get_tunnel (p,
832 msg->best_path_length = htonl (0); // FIXME: get length of shortest known path!
833 GNUNET_MQ_send (c->mq,
840 * Handler for client's INFO PEERS request.
842 * @param cls Identification of the client.
843 * @param message The actual message.
846 handle_get_peers (void *cls,
847 const struct GNUNET_MessageHeader *message)
849 struct CadetClient *c = cls;
850 struct GNUNET_MQ_Envelope *env;
851 struct GNUNET_MessageHeader *reply;
853 GCP_iterate_all (&get_all_peers_iterator,
855 env = GNUNET_MQ_msg (reply,
856 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS_END);
857 GNUNET_MQ_send (c->mq,
859 GNUNET_SERVICE_client_continue (c->client);
864 * Iterator over all paths of a peer to build an InfoPeer message.
865 * Message contains blocks of peers, first not included.
867 * @param cls message queue for transmission
868 * @param path Path itself
869 * @param off offset of the peer on @a path
870 * @return #GNUNET_YES if should keep iterating.
871 * #GNUNET_NO otherwise.
874 path_info_iterator (void *cls,
875 struct CadetPeerPath *path,
878 struct GNUNET_MQ_Handle *mq = cls;
879 struct GNUNET_MQ_Envelope *env;
880 struct GNUNET_CADET_LocalInfoPath *resp;
881 struct GNUNET_PeerIdentity *id;
883 unsigned int path_length;
885 path_length = GCPP_get_length (path);
886 path_size = sizeof (struct GNUNET_PeerIdentity) * path_length;
887 if (sizeof (*resp) + path_size > UINT16_MAX)
889 /* try just giving the relevant path */
890 path_length = GNUNET_MIN ((UINT16_MAX - sizeof (*resp)) / sizeof (struct GNUNET_PeerIdentity),
892 path_size = sizeof (struct GNUNET_PeerIdentity) * path_length;
894 if (sizeof (*resp) + path_size > UINT16_MAX)
896 LOG (GNUNET_ERROR_TYPE_WARNING,
897 "Path of %u entries is too long for info message\n",
901 env = GNUNET_MQ_msg_extra (resp,
903 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PATH);
904 id = (struct GNUNET_PeerIdentity *) &resp[1];
906 /* Don't copy first peer. First peer is always the local one. Last
907 * peer is always the destination (leave as 0, EOL).
909 for (unsigned int i = 0; i < path_length; i++)
910 id[i] = *GCP_get_id (GCPP_get_peer_at_offset (path,
912 resp->off = htonl (off);
920 * Handler for client's #GNUNET_MESSAGE_TYPE_CADET_LOCAL_REQUEST_INFO_PATH request.
922 * @param cls Identification of the client.
923 * @param msg The actual message.
926 handle_show_path (void *cls,
927 const struct GNUNET_CADET_RequestPathInfoMessage *msg)
929 struct CadetClient *c = cls;
931 struct GNUNET_MQ_Envelope *env;
932 struct GNUNET_MessageHeader *resp;
934 p = GCP_get (&msg->peer,
937 GCP_iterate_indirect_paths (p,
940 env = GNUNET_MQ_msg (resp,
941 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PATH_END);
942 GNUNET_MQ_send (c->mq,
944 GNUNET_SERVICE_client_continue (c->client);
949 * Iterator over all tunnels to send a monitoring client info about each tunnel.
951 * @param cls Closure ().
952 * @param peer Peer ID (tunnel remote peer).
953 * @param value a `struct CadetPeer`
954 * @return #GNUNET_YES, to keep iterating.
957 get_all_tunnels_iterator (void *cls,
958 const struct GNUNET_PeerIdentity *peer,
961 struct CadetClient *c = cls;
962 struct CadetPeer *p = value;
963 struct GNUNET_MQ_Envelope *env;
964 struct GNUNET_CADET_LocalInfoTunnel *msg;
965 struct CadetTunnel *t;
967 t = GCP_get_tunnel (p,
971 env = GNUNET_MQ_msg (msg,
972 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS);
973 msg->destination = *peer;
974 msg->channels = htonl (GCT_count_channels (t));
975 msg->connections = htonl (GCT_count_any_connections (t));
976 msg->cstate = htons (0);
977 msg->estate = htons ((uint16_t) GCT_get_estate (t));
978 GNUNET_MQ_send (c->mq,
985 * Handler for client's #GNUNET_MESSAGE_TYPE_CADET_LOCAL_REQUEST_INFO_TUNNELS request.
987 * @param cls client Identification of the client.
988 * @param message The actual message.
991 handle_info_tunnels (void *cls,
992 const struct GNUNET_MessageHeader *message)
994 struct CadetClient *c = cls;
995 struct GNUNET_MQ_Envelope *env;
996 struct GNUNET_MessageHeader *reply;
998 GCP_iterate_all (&get_all_tunnels_iterator,
1000 env = GNUNET_MQ_msg (reply,
1001 GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS_END);
1002 GNUNET_MQ_send (c->mq,
1004 GNUNET_SERVICE_client_continue (c->client);
1009 * Callback called when a client connects to the service.
1011 * @param cls closure for the service
1012 * @param client the new client that connected to the service
1013 * @param mq the message queue used to send messages to the client
1017 client_connect_cb (void *cls,
1018 struct GNUNET_SERVICE_Client *client,
1019 struct GNUNET_MQ_Handle *mq)
1021 struct CadetClient *c;
1023 c = GNUNET_new (struct CadetClient);
1026 c->id = next_client_id++; /* overflow not important: just for debug */
1028 = GNUNET_CONTAINER_multihashmap32_create (32);
1029 GNUNET_CONTAINER_DLL_insert (clients_head,
1032 GNUNET_STATISTICS_update (stats,
1036 LOG (GNUNET_ERROR_TYPE_DEBUG,
1044 * A channel was destroyed by the other peer. Tell our client.
1046 * @param c client that lost a channel
1047 * @param ccn channel identification number for the client
1048 * @param ch the channel object
1051 GSC_handle_remote_channel_destroy (struct CadetClient *c,
1052 struct GNUNET_CADET_ClientChannelNumber ccn,
1053 struct CadetChannel *ch)
1055 struct GNUNET_MQ_Envelope *env;
1056 struct GNUNET_CADET_LocalChannelDestroyMessage *tdm;
1058 env = GNUNET_MQ_msg (tdm,
1059 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY);
1061 GSC_send_to_client (c,
1063 GNUNET_assert (GNUNET_YES ==
1064 GNUNET_CONTAINER_multihashmap32_remove (c->channels,
1065 ntohl (ccn.channel_of_client),
1071 * A client that created a loose channel that was not bound to a port
1072 * disconnected, drop it from the #loose_channels list.
1074 * @param h_port the hashed port the channel was trying to bind to
1075 * @param ch the channel that was lost
1078 GSC_drop_loose_channel (const struct GNUNET_HashCode *h_port,
1079 struct CadetChannel *ch)
1081 GNUNET_assert (GNUNET_YES ==
1082 GNUNET_CONTAINER_multihashmap_remove (loose_channels,
1089 * Iterator for deleting each channel whose client endpoint disconnected.
1091 * @param cls Closure (client that has disconnected).
1092 * @param key The local channel id in host byte order
1093 * @param value The value stored at the key (channel to destroy).
1094 * @return #GNUNET_OK, keep iterating.
1097 channel_destroy_iterator (void *cls,
1101 struct CadetClient *c = cls;
1102 struct GNUNET_CADET_ClientChannelNumber ccn;
1103 struct CadetChannel *ch = value;
1105 LOG (GNUNET_ERROR_TYPE_DEBUG,
1106 "Destroying %s, due to %s disconnecting.\n",
1109 ccn.channel_of_client = htonl (key);
1110 GCCH_channel_local_destroy (ch,
1113 GNUNET_assert (GNUNET_YES ==
1114 GNUNET_CONTAINER_multihashmap32_remove (c->channels,
1122 * Remove client's ports from the global hashmap on disconnect.
1124 * @param cls the `struct CadetClient`
1125 * @param port the port.
1126 * @param value the `struct OpenPort` to remove
1127 * @return #GNUNET_OK, keep iterating.
1130 client_release_ports (void *cls,
1131 const struct GNUNET_HashCode *port,
1134 struct CadetClient *c = cls;
1135 struct OpenPort *op = value;
1137 GNUNET_assert (c == op->c);
1138 LOG (GNUNET_ERROR_TYPE_DEBUG,
1139 "Closing port %s due to %s disconnect.\n",
1142 GNUNET_assert (GNUNET_YES ==
1143 GNUNET_CONTAINER_multihashmap_remove (open_ports,
1146 GNUNET_assert (GNUNET_YES ==
1147 GNUNET_CONTAINER_multihashmap_remove (c->ports,
1156 * Callback called when a client disconnected from the service
1158 * @param cls closure for the service
1159 * @param client the client that disconnected
1160 * @param internal_cls should be equal to @a c
1163 client_disconnect_cb (void *cls,
1164 struct GNUNET_SERVICE_Client *client,
1167 struct CadetClient *c = internal_cls;
1169 GNUNET_assert (c->client == client);
1170 LOG (GNUNET_ERROR_TYPE_DEBUG,
1171 "%s is disconnecting.\n",
1173 if (NULL != c->channels)
1175 GNUNET_CONTAINER_multihashmap32_iterate (c->channels,
1176 &channel_destroy_iterator,
1178 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap32_size (c->channels));
1179 GNUNET_CONTAINER_multihashmap32_destroy (c->channels);
1181 if (NULL != c->ports)
1183 GNUNET_CONTAINER_multihashmap_iterate (c->ports,
1184 &client_release_ports,
1186 GNUNET_CONTAINER_multihashmap_destroy (c->ports);
1188 GNUNET_CONTAINER_DLL_remove (clients_head,
1191 GNUNET_STATISTICS_update (stats,
1196 if ( (NULL == clients_head) &&
1197 (GNUNET_YES == shutting_down) )
1203 * Setup CADET internals.
1205 * @param cls closure
1206 * @param server the initialized server
1207 * @param c configuration to use
1211 const struct GNUNET_CONFIGURATION_Handle *c,
1212 struct GNUNET_SERVICE_Handle *service)
1216 GNUNET_CONFIGURATION_get_value_number (c,
1221 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1224 "needs to be a number");
1225 ratchet_messages = 64;
1228 GNUNET_CONFIGURATION_get_value_time (c,
1233 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1236 "need delay value");
1237 ratchet_time = GNUNET_TIME_UNIT_HOURS;
1240 GNUNET_CONFIGURATION_get_value_time (c,
1242 "REFRESH_CONNECTION_TIME",
1245 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1247 "REFRESH_CONNECTION_TIME",
1248 "need delay value");
1249 keepalive_period = GNUNET_TIME_UNIT_MINUTES;
1252 GNUNET_CONFIGURATION_get_value_number (c,
1261 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1262 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1263 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1264 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1265 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1267 my_private_key = GNUNET_CRYPTO_eddsa_key_create_from_configuration (c);
1268 if (NULL == my_private_key)
1271 GNUNET_SCHEDULER_shutdown ();
1274 GNUNET_CRYPTO_eddsa_key_get_public (my_private_key,
1275 &my_full_id.public_key);
1276 stats = GNUNET_STATISTICS_create ("cadet",
1278 GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
1280 ats_ch = GNUNET_ATS_connectivity_init (c);
1281 /* FIXME: optimize code to allow GNUNET_YES here! */
1282 open_ports = GNUNET_CONTAINER_multihashmap_create (16,
1284 loose_channels = GNUNET_CONTAINER_multihashmap_create (16,
1286 peers = GNUNET_CONTAINER_multipeermap_create (16,
1288 connections = GNUNET_CONTAINER_multishortmap_create (256,
1293 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1294 "CADET started for peer %s\n",
1295 GNUNET_i2s (&my_full_id));
1301 * Define "main" method using service macro.
1305 GNUNET_SERVICE_OPTION_NONE,
1308 &client_disconnect_cb,
1310 GNUNET_MQ_hd_fixed_size (port_open,
1311 GNUNET_MESSAGE_TYPE_CADET_LOCAL_PORT_OPEN,
1312 struct GNUNET_CADET_PortMessage,
1314 GNUNET_MQ_hd_fixed_size (port_close,
1315 GNUNET_MESSAGE_TYPE_CADET_LOCAL_PORT_CLOSE,
1316 struct GNUNET_CADET_PortMessage,
1318 GNUNET_MQ_hd_fixed_size (channel_create,
1319 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_CREATE,
1320 struct GNUNET_CADET_LocalChannelCreateMessage,
1322 GNUNET_MQ_hd_fixed_size (channel_destroy,
1323 GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY,
1324 struct GNUNET_CADET_LocalChannelDestroyMessage,
1326 GNUNET_MQ_hd_var_size (local_data,
1327 GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA,
1328 struct GNUNET_CADET_LocalData,
1330 GNUNET_MQ_hd_fixed_size (local_ack,
1331 GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK,
1332 struct GNUNET_CADET_LocalAck,
1334 GNUNET_MQ_hd_fixed_size (get_peers,
1335 GNUNET_MESSAGE_TYPE_CADET_LOCAL_REQUEST_INFO_PEERS,
1336 struct GNUNET_MessageHeader,
1338 GNUNET_MQ_hd_fixed_size (show_path,
1339 GNUNET_MESSAGE_TYPE_CADET_LOCAL_REQUEST_INFO_PATH,
1340 struct GNUNET_CADET_RequestPathInfoMessage,
1342 GNUNET_MQ_hd_fixed_size (info_tunnels,
1343 GNUNET_MESSAGE_TYPE_CADET_LOCAL_REQUEST_INFO_TUNNELS,
1344 struct GNUNET_MessageHeader,
1346 GNUNET_MQ_handler_end ());
1348 /* end of gnunet-service-cadet-new.c */