2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file transport/gnunet-service-transport.c
23 * @brief low-level P2P messaging
24 * @author Christian Grothoff
28 #include "gnunet_client_lib.h"
29 #include "gnunet_container_lib.h"
30 #include "gnunet_constants.h"
31 #include "gnunet_getopt_lib.h"
32 #include "gnunet_hello_lib.h"
33 #include "gnunet_os_lib.h"
34 #include "gnunet_peerinfo_service.h"
35 #include "gnunet_plugin_lib.h"
36 #include "gnunet_protocols.h"
37 #include "gnunet_service_lib.h"
38 #include "gnunet_signatures.h"
39 #include "plugin_transport.h"
40 #include "transport.h"
42 #define DEBUG_BLACKLIST GNUNET_NO
44 #define DEBUG_PING_PONG GNUNET_NO
46 #define SIGN_USELESS GNUNET_NO
49 * Should we do some additional checks (to validate behavior
52 #define EXTRA_CHECKS GNUNET_YES
55 * How many messages can we have pending for a given client process
56 * before we start to drop incoming messages? We typically should
57 * have only one client and so this would be the primary buffer for
58 * messages, so the number should be chosen rather generously.
60 * The expectation here is that most of the time the queue is large
61 * enough so that a drop is virtually never required. Note that
62 * this value must be about as large as 'TOTAL_MSGS' in the
63 * 'test_transport_api_reliability.c', otherwise that testcase may
66 #define MAX_PENDING (128 * 1024)
69 * Size of the per-transport blacklist hash maps.
71 #define TRANSPORT_BLACKLIST_HT_SIZE 16
74 * How often should we try to reconnect to a peer using a particular
75 * transport plugin before giving up? Note that the plugin may be
76 * added back to the list after PLUGIN_RETRY_FREQUENCY expires.
78 #define MAX_CONNECT_RETRY 3
81 * Limit on the number of ready-to-run tasks when validating
82 * HELLOs. If more tasks are ready to run, we will drop
83 * HELLOs instead of validating them.
85 #define MAX_HELLO_LOAD 4
88 * How often must a peer violate bandwidth quotas before we start
89 * to simply drop its messages?
91 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
94 * How long until a HELLO verification attempt should time out?
95 * Must be rather small, otherwise a partially successful HELLO
96 * validation (some addresses working) might not be available
97 * before a client's request for a connection fails for good.
98 * Besides, if a single request to an address takes a long time,
99 * then the peer is unlikely worthwhile anyway.
101 #define HELLO_VERIFICATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
104 * Priority to use for PONG messages.
106 #define TRANSPORT_PONG_PRIORITY 4
109 * How often do we re-add (cheaper) plugins to our list of plugins
110 * to try for a given connected peer?
112 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
115 * After how long do we expire an address in a HELLO that we just
116 * validated? This value is also used for our own addresses when we
119 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
123 * How long before an existing address expires should we again try to
124 * validate it? Must be (significantly) smaller than
125 * HELLO_ADDRESS_EXPIRATION.
127 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
130 * Maximum frequency for re-evaluating latencies for all transport addresses.
132 #define LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
135 * Maximum frequency for re-evaluating latencies for connected addresses.
137 #define CONNECTED_LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 1)
141 * List of addresses of other peers
143 struct ForeignAddressList
146 * This is a linked list.
148 struct ForeignAddressList *next;
151 * Which ready list does this entry belong to.
153 struct ReadyList *ready_list;
156 * How long until we auto-expire this address (unless it is
157 * re-confirmed by the transport)?
159 struct GNUNET_TIME_Absolute expires;
162 * Task used to re-validate addresses, updates latencies and
165 GNUNET_SCHEDULER_TaskIdentifier revalidate_task;
173 * Session (or NULL if no valid session currently exists or if the
174 * plugin does not use sessions).
176 struct Session *session;
179 * What was the last latency observed for this address, plugin and peer?
181 struct GNUNET_TIME_Relative latency;
184 * If we did not successfully transmit a message to the given peer
185 * via this connection during the specified time, we should consider
186 * the connection to be dead. This is used in the case that a TCP
187 * transport simply stalls writing to the stream but does not
188 * formerly get a signal that the other peer died.
190 struct GNUNET_TIME_Absolute timeout;
193 * How often have we tried to connect using this plugin? Used to
194 * discriminate against addresses that do not work well.
195 * FIXME: not yet used, but should be!
197 unsigned int connect_attempts;
200 * DV distance to this peer (1 if no DV is used).
201 * FIXME: need to set this from transport plugins!
211 * Have we ever estimated the latency of this address? Used to
212 * ensure that the first time we add an address, we immediately
218 * Are we currently connected via this address? The first time we
219 * successfully transmit or receive data to a peer via a particular
220 * address, we set this to GNUNET_YES. If we later get an error
221 * (disconnect notification, transmission failure, timeout), we set
222 * it back to GNUNET_NO.
227 * Is this plugin currently busy transmitting to the specific target?
228 * GNUNET_NO if not (initial, default state is GNUNET_NO). Internal
229 * messages do not count as 'in transmit'.
234 * Has this address been validated yet?
242 * Entry in linked list of network addresses for ourselves.
244 struct OwnAddressList
247 * This is a linked list.
249 struct OwnAddressList *next;
252 * The address, actually a pointer to the end
253 * of this struct. Do not free!
258 * How long until we auto-expire this address (unless it is
259 * re-confirmed by the transport)?
261 struct GNUNET_TIME_Absolute expires;
272 * Entry in linked list of all of our plugins.
274 struct TransportPlugin
278 * This is a linked list.
280 struct TransportPlugin *next;
283 * API of the transport as returned by the plugin's
284 * initialization function.
286 struct GNUNET_TRANSPORT_PluginFunctions *api;
289 * Short name for the plugin (i.e. "tcp").
294 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
299 * List of our known addresses for this transport.
301 struct OwnAddressList *addresses;
304 * Environment this transport service is using
307 struct GNUNET_TRANSPORT_PluginEnvironment env;
310 * ID of task that is used to clean up expired addresses.
312 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
315 * Set to GNUNET_YES if we need to scrap the existing list of
316 * "addresses" and start fresh when we receive the next address
317 * update from a transport. Set to GNUNET_NO if we should just add
318 * the new address to the list and wait for the commit call.
323 * Hashmap of blacklisted peers for this particular transport.
325 struct GNUNET_CONTAINER_MultiHashMap *blacklist;
328 struct NeighbourList;
331 * For each neighbour we keep a list of messages
332 * that we still want to transmit to the neighbour.
338 * This is a doubly linked list.
340 struct MessageQueue *next;
343 * This is a doubly linked list.
345 struct MessageQueue *prev;
348 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
349 * stuck together in memory. Allocated at the end of this struct.
351 const char *message_buf;
354 * Size of the message buf
356 size_t message_buf_size;
359 * Client responsible for queueing the message;
360 * used to check that a client has no two messages
361 * pending for the same target. Can be NULL.
363 struct TransportClient *client;
366 * Using which specific address should we send this message?
368 struct ForeignAddressList *specific_address;
371 * Peer ID of the Neighbour this entry belongs to.
373 struct GNUNET_PeerIdentity neighbour_id;
376 * Plugin that we used for the transmission.
377 * NULL until we scheduled a transmission.
379 struct TransportPlugin *plugin;
382 * At what time should we fail?
384 struct GNUNET_TIME_Absolute timeout;
387 * Internal message of the transport system that should not be
388 * included in the usual SEND-SEND_OK transmission confirmation
389 * traffic management scheme. Typically, "internal_msg" will
390 * be set whenever "client" is NULL (but it is not strictly
396 * How important is the message?
398 unsigned int priority;
404 * For a given Neighbour, which plugins are available
405 * to talk to this peer and what are their costs?
410 * This is a linked list.
412 struct ReadyList *next;
415 * Which of our transport plugins does this entry
418 struct TransportPlugin *plugin;
421 * Transport addresses, latency, and readiness for
422 * this particular plugin.
424 struct ForeignAddressList *addresses;
427 * To which neighbour does this ready list belong to?
429 struct NeighbourList *neighbour;
435 * Entry in linked list of all of our current neighbours.
441 * This is a linked list.
443 struct NeighbourList *next;
446 * Which of our transports is connected to this peer
447 * and what is their status?
449 struct ReadyList *plugins;
452 * Head of list of messages we would like to send to this peer;
453 * must contain at most one message per client.
455 struct MessageQueue *messages_head;
458 * Tail of list of messages we would like to send to this peer; must
459 * contain at most one message per client.
461 struct MessageQueue *messages_tail;
464 * Buffer for at most one payload message used when we receive
465 * payload data before our PING-PONG has succeeded. We then
466 * store such messages in this intermediary buffer until the
467 * connection is fully up.
469 struct GNUNET_MessageHeader *pre_connect_message_buffer;
472 * Context for peerinfo iteration.
473 * NULL after we are done processing peerinfo's information.
475 struct GNUNET_PEERINFO_IteratorContext *piter;
478 * Public key for this peer. Valid only if the respective flag is set below.
480 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
483 * Identity of this neighbour.
485 struct GNUNET_PeerIdentity id;
488 * ID of task scheduled to run when this peer is about to
489 * time out (will free resources associated with the peer).
491 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
494 * ID of task scheduled to run when we should retry transmitting
495 * the head of the message queue. Actually triggered when the
496 * transmission is timing out (we trigger instantly when we have
497 * a chance of success).
499 GNUNET_SCHEDULER_TaskIdentifier retry_task;
502 * How long until we should consider this peer dead
503 * (if we don't receive another message in the
506 struct GNUNET_TIME_Absolute peer_timeout;
509 * Tracker for inbound bandwidth.
511 struct GNUNET_BANDWIDTH_Tracker in_tracker;
514 * The latency we have seen for this particular address for
515 * this particular peer. This latency may have been calculated
516 * over multiple transports. This value reflects how long it took
517 * us to receive a response when SENDING via this particular
518 * transport/neighbour/address combination!
520 * FIXME: we need to periodically send PINGs to update this
521 * latency (at least more often than the current "huge" (11h?)
524 struct GNUNET_TIME_Relative latency;
527 * How often has the other peer (recently) violated the
528 * inbound traffic limit? Incremented by 10 per violation,
529 * decremented by 1 per non-violation (for each
532 unsigned int quota_violation_count;
535 * DV distance to this peer (1 if no DV is used).
540 * Have we seen an PONG from this neighbour in the past (and
541 * not had a disconnect since)?
546 * Do we have a valid public key for this neighbour?
548 int public_key_valid;
553 * Message used to ask a peer to validate receipt (to check an address
556 struct TransportPingMessage
560 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
562 struct GNUNET_MessageHeader header;
565 * Random challenge number (in network byte order).
567 uint32_t challenge GNUNET_PACKED;
570 * Who is the intended recipient?
572 struct GNUNET_PeerIdentity target;
578 * Message used to validate a HELLO. The challenge is included in the
579 * confirmation to make matching of replies to requests possible. The
580 * signature signs the original challenge number, our public key, the
581 * sender's address (so that the sender can check that the address we
582 * saw is plausible for him and possibly detect a MiM attack) and a
583 * timestamp (to limit replay).<p>
585 * This message is followed by the address of the
586 * client that we are observing (which is part of what
589 struct TransportPongMessage
593 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
595 struct GNUNET_MessageHeader header;
598 * For padding, always zero.
600 uint32_t reserved GNUNET_PACKED;
605 struct GNUNET_CRYPTO_RsaSignature signature;
608 * What are we signing and why?
610 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
613 * Random challenge number (in network byte order).
615 uint32_t challenge GNUNET_PACKED;
618 * Who signed this message?
620 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded signer;
623 * Size of address appended to this message
631 * Linked list of messages to be transmitted to the client. Each
632 * entry is followed by the actual message.
634 struct ClientMessageQueueEntry
637 * This is a doubly-linked list.
639 struct ClientMessageQueueEntry *next;
642 * This is a doubly-linked list.
644 struct ClientMessageQueueEntry *prev;
649 * Client connected to the transport service.
651 struct TransportClient
655 * This is a linked list.
657 struct TransportClient *next;
660 * Handle to the client.
662 struct GNUNET_SERVER_Client *client;
665 * Linked list of messages yet to be transmitted to
668 struct ClientMessageQueueEntry *message_queue_head;
671 * Tail of linked list of messages yet to be transmitted to the
674 struct ClientMessageQueueEntry *message_queue_tail;
677 * Current transmit request handle.
679 struct GNUNET_CONNECTION_TransmitHandle *th;
682 * Is a call to "transmit_send_continuation" pending? If so, we
683 * must not free this struct (even if the corresponding client
684 * disconnects) and instead only remove it from the linked list and
685 * set the "client" field to NULL.
690 * Length of the list of messages pending for this client.
692 unsigned int message_count;
698 * Context of currently active requests to peerinfo
699 * for validation of HELLOs.
701 struct CheckHelloValidatedContext;
705 * Entry in map of all HELLOs awaiting validation.
707 struct ValidationEntry
711 * NULL if this entry is not part of a larger HELLO validation.
713 struct CheckHelloValidatedContext *chvc;
716 * The address, actually a pointer to the end
717 * of this struct. Do not free!
722 * Name of the transport.
724 char *transport_name;
727 * The public key of the peer.
729 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
732 * ID of task that will clean up this entry if we don't succeed
733 * with the validation first.
735 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
738 * At what time did we send this validation?
740 struct GNUNET_TIME_Absolute send_time;
743 * Session being validated (or NULL for none).
745 struct Session *session;
748 * Challenge number we used.
761 * Context of currently active requests to peerinfo
762 * for validation of HELLOs.
764 struct CheckHelloValidatedContext
768 * This is a doubly-linked list.
770 struct CheckHelloValidatedContext *next;
773 * This is a doubly-linked list.
775 struct CheckHelloValidatedContext *prev;
778 * Hello that we are validating.
780 const struct GNUNET_HELLO_Message *hello;
783 * Context for peerinfo iteration.
784 * NULL after we are done processing peerinfo's information.
786 struct GNUNET_PEERINFO_IteratorContext *piter;
789 * Was a HELLO known for this peer to peerinfo?
794 * Number of validation entries currently referring to this
797 unsigned int ve_count;
805 static struct GNUNET_HELLO_Message *our_hello;
810 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
815 static struct GNUNET_PeerIdentity my_identity;
820 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
825 struct GNUNET_SCHEDULER_Handle *sched;
830 const struct GNUNET_CONFIGURATION_Handle *cfg;
833 * Linked list of all clients to this service.
835 static struct TransportClient *clients;
838 * All loaded plugins.
840 static struct TransportPlugin *plugins;
843 * Handle to peerinfo service.
845 static struct GNUNET_PEERINFO_Handle *peerinfo;
848 * All known neighbours and their HELLOs.
850 static struct NeighbourList *neighbours;
853 * Number of neighbours we'd like to have.
855 static uint32_t max_connect_per_transport;
858 * Head of linked list.
860 static struct CheckHelloValidatedContext *chvc_head;
863 * Tail of linked list.
865 static struct CheckHelloValidatedContext *chvc_tail;
868 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
869 * of the given peer that we are currently validating).
871 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
874 * Handle for reporting statistics.
876 static struct GNUNET_STATISTICS_Handle *stats;
880 * The peer specified by the given neighbour has timed-out or a plugin
881 * has disconnected. We may either need to do nothing (other plugins
882 * still up), or trigger a full disconnect and clean up. This
883 * function updates our state and do the necessary notifications.
884 * Also notifies our clients that the neighbour is now officially
887 * @param n the neighbour list entry for the peer
888 * @param check should we just check if all plugins
889 * disconnected or must we ask all plugins to
892 static void disconnect_neighbour (struct NeighbourList *n, int check);
895 * Check the ready list for the given neighbour and if a plugin is
896 * ready for transmission (and if we have a message), do so!
898 * @param neighbour target peer for which to transmit
900 static void try_transmission_to_peer (struct NeighbourList *neighbour);
904 * Find an entry in the neighbour list for a particular peer.
906 * @return NULL if not found.
908 static struct NeighbourList *
909 find_neighbour (const struct GNUNET_PeerIdentity *key)
911 struct NeighbourList *head = neighbours;
913 while ((head != NULL) &&
914 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
921 * Find an entry in the transport list for a particular transport.
923 * @return NULL if not found.
925 static struct TransportPlugin *
926 find_transport (const char *short_name)
928 struct TransportPlugin *head = plugins;
929 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
935 * Is a particular peer blacklisted for a particular transport?
937 * @param peer the peer to check for
938 * @param plugin the plugin used to connect to the peer
940 * @return GNUNET_YES if the peer is blacklisted, GNUNET_NO if not
943 is_blacklisted (const struct GNUNET_PeerIdentity *peer, struct TransportPlugin *plugin)
946 if (plugin->blacklist != NULL)
948 if (GNUNET_CONTAINER_multihashmap_contains(plugin->blacklist, &peer->hashPubKey) == GNUNET_YES)
951 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
952 _("Peer `%s:%s' is blacklisted!\n"),
953 plugin->short_name, GNUNET_i2s (peer));
964 add_peer_to_blacklist (struct GNUNET_PeerIdentity *peer, char *transport_name)
966 struct TransportPlugin *plugin;
968 plugin = find_transport(transport_name);
969 if (plugin == NULL) /* Nothing to do */
971 if (plugin->blacklist == NULL)
972 plugin->blacklist = GNUNET_CONTAINER_multihashmap_create(TRANSPORT_BLACKLIST_HT_SIZE);
973 GNUNET_assert(plugin->blacklist != NULL);
974 GNUNET_CONTAINER_multihashmap_put(plugin->blacklist, &peer->hashPubKey,
976 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
981 * Read the blacklist file, containing transport:peer entries.
982 * Provided the transport is loaded, set up hashmap with these
983 * entries to blacklist peers by transport.
987 read_blacklist_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
994 struct GNUNET_PeerIdentity pid;
996 struct GNUNET_CRYPTO_HashAsciiEncoded enc;
997 unsigned int entries_found;
998 char *transport_name;
1001 GNUNET_CONFIGURATION_get_value_filename (cfg,
1007 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1008 _("Option `%s' in section `%s' not specified!\n"),
1014 if (GNUNET_OK != GNUNET_DISK_file_test (fn))
1015 GNUNET_DISK_fn_write (fn, NULL, 0, GNUNET_DISK_PERM_USER_READ
1016 | GNUNET_DISK_PERM_USER_WRITE);
1017 if (0 != STAT (fn, &frstat))
1019 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1020 _("Could not read blacklist file `%s'\n"), fn);
1024 if (frstat.st_size == 0)
1026 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1027 _("Blacklist file `%s' is empty.\n"),
1032 /* FIXME: use mmap */
1033 data = GNUNET_malloc_large (frstat.st_size);
1034 GNUNET_assert(data != NULL);
1035 if (frstat.st_size !=
1036 GNUNET_DISK_fn_read (fn, data, frstat.st_size))
1038 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1039 _("Failed to read blacklist from `%s'\n"), fn);
1046 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1048 while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
1049 (pos <= frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
1052 while ((colon_pos < frstat.st_size) && (data[colon_pos] != ':') && !isspace ( (unsigned char) data[colon_pos]))
1055 if (colon_pos >= frstat.st_size)
1057 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1058 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1059 (unsigned long long) colon_pos);
1065 if (isspace( (unsigned char) data[colon_pos]))
1067 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1068 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1069 (unsigned long long) colon_pos);
1071 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1075 tsize = colon_pos - pos;
1076 if ((pos >= frstat.st_size) || (pos + tsize >= frstat.st_size) || (tsize == 0))
1078 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1079 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1080 (unsigned long long) colon_pos);
1086 transport_name = GNUNET_malloc(tsize + 1);
1087 memcpy(transport_name, &data[pos], tsize);
1088 pos = colon_pos + 1;
1090 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1091 _("Read transport name %s in blacklist file.\n"),
1094 memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
1095 if (!isspace ( (unsigned char) enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
1097 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1098 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1099 (unsigned long long) pos);
1101 while ((pos < frstat.st_size) && (!isspace ( (unsigned char) data[pos])))
1103 GNUNET_free_non_null(transport_name);
1106 enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
1107 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
1109 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1110 _("Syntax error in blacklist file at offset %llu, skipping bytes `%s'.\n"),
1111 (unsigned long long) pos,
1116 if (0 != memcmp (&pid,
1118 sizeof (struct GNUNET_PeerIdentity)))
1121 add_peer_to_blacklist (&pid,
1126 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1127 _("Found myself `%s' in blacklist (useless, ignored)\n"),
1131 pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
1132 GNUNET_free_non_null(transport_name);
1133 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1142 * Function called to notify a client about the socket being ready to
1143 * queue more data. "buf" will be NULL and "size" zero if the socket
1144 * was closed for writing in the meantime.
1146 * @param cls closure
1147 * @param size number of bytes available in buf
1148 * @param buf where the callee should write the message
1149 * @return number of bytes written to buf
1152 transmit_to_client_callback (void *cls, size_t size, void *buf)
1154 struct TransportClient *client = cls;
1155 struct ClientMessageQueueEntry *q;
1158 const struct GNUNET_MessageHeader *msg;
1164 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1165 "Transmission to client failed, closing connection.\n");
1166 /* fatal error with client, free message queue! */
1167 while (NULL != (q = client->message_queue_head))
1169 GNUNET_STATISTICS_update (stats,
1170 gettext_noop ("# bytes discarded (could not transmit to client)"),
1171 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
1173 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1174 client->message_queue_tail,
1178 client->message_count = 0;
1183 while (NULL != (q = client->message_queue_head))
1185 msg = (const struct GNUNET_MessageHeader *) &q[1];
1186 msize = ntohs (msg->size);
1187 if (msize + tsize > size)
1190 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1191 "Transmitting message of type %u to client.\n",
1194 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1195 client->message_queue_tail,
1197 memcpy (&cbuf[tsize], msg, msize);
1200 client->message_count--;
1204 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1205 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1207 GNUNET_TIME_UNIT_FOREVER_REL,
1208 &transmit_to_client_callback,
1210 GNUNET_assert (client->th != NULL);
1217 * Convert an address to a string.
1219 * @param plugin name of the plugin responsible for the address
1220 * @param addr binary address
1221 * @param addr_len number of bytes in addr
1222 * @return NULL on error, otherwise address string
1225 a2s (const char *plugin,
1229 struct TransportPlugin *p;
1233 p = find_transport (plugin);
1236 return p->api->address_to_string (p->api->cls,
1243 * Mark the given FAL entry as 'connected' (and hence preferred for
1244 * sending); also mark all others for the same peer as 'not connected'
1245 * (since only one can be preferred).
1247 * @param fal address to set to 'connected'
1250 mark_address_connected (struct ForeignAddressList *fal)
1252 struct ForeignAddressList *pos;
1255 GNUNET_assert (GNUNET_YES == fal->validated);
1256 if (fal->connected == GNUNET_YES)
1257 return; /* nothing to do */
1259 pos = fal->ready_list->addresses;
1262 if (GNUNET_YES == pos->connected)
1265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1266 "Marking address `%s' as no longer connected (due to connect on other address)\n",
1267 a2s (pos->ready_list->plugin->short_name,
1271 GNUNET_break (cnt == GNUNET_YES);
1273 pos->connected = GNUNET_NO;
1274 GNUNET_STATISTICS_update (stats,
1275 gettext_noop ("# connected addresses"),
1281 fal->connected = GNUNET_YES;
1282 if (GNUNET_YES == cnt)
1284 GNUNET_STATISTICS_update (stats,
1285 gettext_noop ("# connected addresses"),
1293 * Send the specified message to the specified client. Since multiple
1294 * messages may be pending for the same client at a time, this code
1295 * makes sure that no message is lost.
1297 * @param client client to transmit the message to
1298 * @param msg the message to send
1299 * @param may_drop can this message be dropped if the
1300 * message queue for this client is getting far too large?
1303 transmit_to_client (struct TransportClient *client,
1304 const struct GNUNET_MessageHeader *msg, int may_drop)
1306 struct ClientMessageQueueEntry *q;
1309 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
1311 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1313 ("Dropping message of type %u and size %u, have %u messages pending (%u is the soft limit)\n"),
1316 client->message_count,
1318 GNUNET_STATISTICS_update (stats,
1319 gettext_noop ("# messages dropped due to slow client"),
1324 msize = ntohs (msg->size);
1325 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1326 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1327 memcpy (&q[1], msg, msize);
1328 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1329 client->message_queue_tail,
1330 client->message_queue_tail,
1332 client->message_count++;
1333 if (client->th == NULL)
1335 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1337 GNUNET_TIME_UNIT_FOREVER_REL,
1338 &transmit_to_client_callback,
1340 GNUNET_assert (client->th != NULL);
1346 * Transmit a 'SEND_OK' notification to the given client for the
1349 * @param client who to notify
1350 * @param n neighbour to notify about
1351 * @param result status code for the transmission request
1354 transmit_send_ok (struct TransportClient *client,
1355 struct NeighbourList *n,
1358 struct SendOkMessage send_ok_msg;
1360 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1361 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1362 send_ok_msg.success = htonl (result);
1363 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1364 send_ok_msg.peer = n->id;
1365 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1370 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1371 * upon "completion" of a send request. This tells the API
1372 * that it is now legal to send another message to the given
1375 * @param cls closure, identifies the entry on the
1376 * message queue that was transmitted and the
1377 * client responsible for queueing the message
1378 * @param target the peer receiving the message
1379 * @param result GNUNET_OK on success, if the transmission
1380 * failed, we should not tell the client to transmit
1384 transmit_send_continuation (void *cls,
1385 const struct GNUNET_PeerIdentity *target,
1388 struct MessageQueue *mq = cls;
1389 struct NeighbourList *n;
1391 GNUNET_STATISTICS_update (stats,
1392 gettext_noop ("# bytes pending with plugins"),
1393 - (int64_t) mq->message_buf_size,
1395 if (result == GNUNET_OK)
1397 GNUNET_STATISTICS_update (stats,
1398 gettext_noop ("# bytes successfully transmitted by plugins"),
1399 mq->message_buf_size,
1404 GNUNET_STATISTICS_update (stats,
1405 gettext_noop ("# bytes with transmission failure by plugins"),
1406 mq->message_buf_size,
1409 n = find_neighbour(&mq->neighbour_id);
1410 GNUNET_assert (n != NULL);
1411 if (mq->specific_address != NULL)
1413 if (result == GNUNET_OK)
1415 mq->specific_address->timeout =
1416 GNUNET_TIME_relative_to_absolute
1417 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1418 if (mq->specific_address->validated == GNUNET_YES)
1419 mark_address_connected (mq->specific_address);
1423 if (mq->specific_address->connected != GNUNET_NO)
1426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1427 "Marking address `%s' as no longer connected (due to transmission problem)\n",
1428 a2s (mq->specific_address->ready_list->plugin->short_name,
1429 mq->specific_address->addr,
1430 mq->specific_address->addrlen));
1432 GNUNET_STATISTICS_update (stats,
1433 gettext_noop ("# connected addresses"),
1436 mq->specific_address->connected = GNUNET_NO;
1439 if (! mq->internal_msg)
1440 mq->specific_address->in_transmit = GNUNET_NO;
1442 if (mq->client != NULL)
1443 transmit_send_ok (mq->client, n, result);
1445 try_transmission_to_peer (n);
1450 * Find an address in any of the available transports for
1451 * the given neighbour that would be good for message
1452 * transmission. This is essentially the transport selection
1455 * @param neighbour for whom to select an address
1456 * @return selected address, NULL if we have none
1458 struct ForeignAddressList *
1459 find_ready_address(struct NeighbourList *neighbour)
1461 struct ReadyList *head = neighbour->plugins;
1462 struct ForeignAddressList *addresses;
1463 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1464 struct ForeignAddressList *best_address;
1466 best_address = NULL;
1467 while (head != NULL)
1469 addresses = head->addresses;
1470 while (addresses != NULL)
1472 if ( (addresses->timeout.value < now.value) &&
1473 (addresses->connected == GNUNET_YES) )
1476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1477 "Marking long-time inactive connection to `%4s' as down.\n",
1478 GNUNET_i2s (&neighbour->id));
1480 GNUNET_STATISTICS_update (stats,
1481 gettext_noop ("# connected addresses"),
1484 addresses->connected = GNUNET_NO;
1486 addresses = addresses->next;
1489 addresses = head->addresses;
1490 while (addresses != NULL)
1492 #if DEBUG_TRANSPORT > 1
1493 if (addresses->addr != NULL)
1494 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1495 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1496 a2s (head->plugin->short_name,
1498 addresses->addrlen),
1499 GNUNET_i2s (&neighbour->id),
1500 addresses->connected,
1501 addresses->in_transmit,
1502 addresses->validated,
1503 addresses->connect_attempts,
1504 (unsigned long long) addresses->timeout.value,
1505 (unsigned int) addresses->distance);
1507 if ( ( (best_address == NULL) ||
1508 (addresses->connected == GNUNET_YES) ||
1509 (best_address->connected == GNUNET_NO) ) &&
1510 (addresses->in_transmit == GNUNET_NO) &&
1511 ( (best_address == NULL) ||
1512 (addresses->latency.value < best_address->latency.value)) )
1513 best_address = addresses;
1514 /* FIXME: also give lower-latency addresses that are not
1515 connected a chance some times... */
1516 addresses = addresses->next;
1520 if (best_address != NULL)
1523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1524 "Best address found (`%s') has latency of %llu ms.\n",
1525 a2s (best_address->ready_list->plugin->short_name,
1527 best_address->addrlen),
1528 best_address->latency.value);
1533 GNUNET_STATISTICS_update (stats,
1534 gettext_noop ("# transmission attempts failed (no address)"),
1538 return best_address;
1544 * We should re-try transmitting to the given peer,
1545 * hopefully we've learned something in the meantime.
1548 retry_transmission_task (void *cls,
1549 const struct GNUNET_SCHEDULER_TaskContext *tc)
1551 struct NeighbourList *n = cls;
1553 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1554 try_transmission_to_peer (n);
1559 * Check the ready list for the given neighbour and if a plugin is
1560 * ready for transmission (and if we have a message), do so!
1562 * @param neighbour target peer for which to transmit
1565 try_transmission_to_peer (struct NeighbourList *neighbour)
1567 struct ReadyList *rl;
1568 struct MessageQueue *mq;
1569 struct GNUNET_TIME_Relative timeout;
1573 if (neighbour->messages_head == NULL)
1576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1577 "Transmission queue for `%4s' is empty\n",
1578 GNUNET_i2s (&neighbour->id));
1580 return; /* nothing to do */
1583 mq = neighbour->messages_head;
1584 force_address = GNUNET_YES;
1585 if (mq->specific_address == NULL)
1587 mq->specific_address = find_ready_address(neighbour);
1588 GNUNET_STATISTICS_update (stats,
1589 gettext_noop ("# transport selected peer address freely"),
1592 force_address = GNUNET_NO;
1594 if (mq->specific_address == NULL)
1596 GNUNET_STATISTICS_update (stats,
1597 gettext_noop ("# transport failed to selected peer address"),
1600 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1601 if (timeout.value == 0)
1604 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1605 "No destination address available to transmit message of size %u to peer `%4s'\n",
1606 mq->message_buf_size,
1607 GNUNET_i2s (&mq->neighbour_id));
1609 GNUNET_STATISTICS_update (stats,
1610 gettext_noop ("# bytes in message queue for other peers"),
1611 - (int64_t) mq->message_buf_size,
1613 GNUNET_STATISTICS_update (stats,
1614 gettext_noop ("# bytes discarded (no destination address available)"),
1615 mq->message_buf_size,
1617 if (mq->client != NULL)
1618 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1619 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1620 neighbour->messages_tail,
1623 return; /* nobody ready */
1625 GNUNET_STATISTICS_update (stats,
1626 gettext_noop ("# message delivery deferred (no address)"),
1629 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1630 GNUNET_SCHEDULER_cancel (sched,
1631 neighbour->retry_task);
1632 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (sched,
1634 &retry_transmission_task,
1637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1638 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1639 mq->message_buf_size,
1640 GNUNET_i2s (&mq->neighbour_id),
1643 /* FIXME: might want to trigger peerinfo lookup here
1644 (unless that's already pending...) */
1647 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1648 neighbour->messages_tail,
1650 if (mq->specific_address->connected == GNUNET_NO)
1651 mq->specific_address->connect_attempts++;
1652 rl = mq->specific_address->ready_list;
1653 mq->plugin = rl->plugin;
1654 if (!mq->internal_msg)
1655 mq->specific_address->in_transmit = GNUNET_YES;
1657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1658 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1659 mq->message_buf_size,
1660 GNUNET_i2s (&neighbour->id),
1661 (mq->specific_address->addr != NULL)
1662 ? a2s (mq->plugin->short_name,
1663 mq->specific_address->addr,
1664 mq->specific_address->addrlen)
1666 rl->plugin->short_name);
1668 GNUNET_STATISTICS_update (stats,
1669 gettext_noop ("# bytes in message queue for other peers"),
1670 - (int64_t) mq->message_buf_size,
1672 GNUNET_STATISTICS_update (stats,
1673 gettext_noop ("# bytes pending with plugins"),
1674 mq->message_buf_size,
1676 ret = rl->plugin->api->send (rl->plugin->api->cls,
1679 mq->message_buf_size,
1681 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1682 mq->specific_address->session,
1683 mq->specific_address->addr,
1684 mq->specific_address->addrlen,
1686 &transmit_send_continuation, mq);
1689 /* failure, but 'send' would not call continuation in this case,
1690 so we need to do it here! */
1691 transmit_send_continuation (mq,
1699 * Send the specified message to the specified peer.
1701 * @param client source of the transmission request (can be NULL)
1702 * @param peer_address ForeignAddressList where we should send this message
1703 * @param priority how important is the message
1704 * @param timeout how long do we have to transmit?
1705 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1706 * @param message_buf_size total size of all messages in message_buf
1707 * @param is_internal is this an internal message; these are pre-pended and
1708 * also do not count for plugins being "ready" to transmit
1709 * @param neighbour handle to the neighbour for transmission
1712 transmit_to_peer (struct TransportClient *client,
1713 struct ForeignAddressList *peer_address,
1714 unsigned int priority,
1715 struct GNUNET_TIME_Relative timeout,
1716 const char *message_buf,
1717 size_t message_buf_size,
1718 int is_internal, struct NeighbourList *neighbour)
1720 struct MessageQueue *mq;
1725 /* check for duplicate submission */
1726 mq = neighbour->messages_head;
1729 if (mq->client == client)
1731 /* client transmitted to same peer twice
1732 before getting SEND_OK! */
1740 GNUNET_STATISTICS_update (stats,
1741 gettext_noop ("# bytes in message queue for other peers"),
1744 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1745 mq->specific_address = peer_address;
1746 mq->client = client;
1747 memcpy (&mq[1], message_buf, message_buf_size);
1748 mq->message_buf = (const char*) &mq[1];
1749 mq->message_buf_size = message_buf_size;
1750 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1751 mq->internal_msg = is_internal;
1752 mq->priority = priority;
1753 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1755 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1756 neighbour->messages_tail,
1759 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1760 neighbour->messages_tail,
1761 neighbour->messages_tail,
1763 try_transmission_to_peer (neighbour);
1770 struct GeneratorContext
1772 struct TransportPlugin *plug_pos;
1773 struct OwnAddressList *addr_pos;
1774 struct GNUNET_TIME_Absolute expiration;
1782 address_generator (void *cls, size_t max, void *buf)
1784 struct GeneratorContext *gc = cls;
1787 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1789 gc->plug_pos = gc->plug_pos->next;
1790 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1792 if (NULL == gc->plug_pos)
1797 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1800 gc->addr_pos->addrlen, buf, max);
1801 gc->addr_pos = gc->addr_pos->next;
1807 * Construct our HELLO message from all of the addresses of
1808 * all of the transports.
1813 struct GNUNET_HELLO_Message *hello;
1814 struct TransportClient *cpos;
1815 struct NeighbourList *npos;
1816 struct GeneratorContext gc;
1818 gc.plug_pos = plugins;
1819 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1820 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1821 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1823 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1824 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1826 GNUNET_STATISTICS_update (stats,
1827 gettext_noop ("# refreshed my HELLO"),
1831 while (cpos != NULL)
1833 transmit_to_client (cpos,
1834 (const struct GNUNET_MessageHeader *) hello,
1839 GNUNET_free_non_null (our_hello);
1841 GNUNET_PEERINFO_add_peer (peerinfo, our_hello);
1843 while (npos != NULL)
1846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1847 "Transmitting updated `%s' to neighbour `%4s'\n",
1848 "HELLO", GNUNET_i2s (&npos->id));
1850 GNUNET_STATISTICS_update (stats,
1851 gettext_noop ("# transmitted my HELLO to other peers"),
1854 transmit_to_peer (NULL, NULL, 0,
1855 HELLO_ADDRESS_EXPIRATION,
1856 (const char *) our_hello,
1857 GNUNET_HELLO_size(our_hello),
1865 * Task used to clean up expired addresses for a plugin.
1867 * @param cls closure
1871 expire_address_task (void *cls,
1872 const struct GNUNET_SCHEDULER_TaskContext *tc);
1876 * Update the list of addresses for this plugin,
1877 * expiring those that are past their expiration date.
1879 * @param plugin addresses of which plugin should be recomputed?
1880 * @param fresh set to GNUNET_YES if a new address was added
1881 * and we need to regenerate the HELLO even if nobody
1885 update_addresses (struct TransportPlugin *plugin, int fresh)
1887 static struct GNUNET_TIME_Absolute last_update;
1888 struct GNUNET_TIME_Relative min_remaining;
1889 struct GNUNET_TIME_Relative remaining;
1890 struct GNUNET_TIME_Absolute now;
1891 struct OwnAddressList *pos;
1892 struct OwnAddressList *prev;
1893 struct OwnAddressList *next;
1896 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1897 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1898 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1899 now = GNUNET_TIME_absolute_get ();
1900 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1901 expired = (GNUNET_TIME_absolute_get_duration (last_update).value > (HELLO_ADDRESS_EXPIRATION.value / 4));
1903 pos = plugin->addresses;
1907 if (pos->expires.value < now.value)
1909 expired = GNUNET_YES;
1911 plugin->addresses = pos->next;
1913 prev->next = pos->next;
1918 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1919 if (remaining.value < min_remaining.value)
1920 min_remaining = remaining;
1926 if (expired || fresh)
1931 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1932 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1934 plugin->address_update_task
1935 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1937 &expire_address_task, plugin);
1942 * Task used to clean up expired addresses for a plugin.
1944 * @param cls closure
1948 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1950 struct TransportPlugin *plugin = cls;
1952 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1953 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1954 update_addresses (plugin, GNUNET_NO);
1959 * Iterator over hash map entries that NULLs the session of validation
1960 * entries that match the given session.
1962 * @param cls closure (the 'struct Session*' to match against)
1963 * @param key current key code (peer ID, not used)
1964 * @param value value in the hash map ('struct ValidationEntry*')
1965 * @return GNUNET_YES (we should continue to iterate)
1968 remove_session_validations (void *cls,
1969 const GNUNET_HashCode * key,
1972 struct Session *session = cls;
1973 struct ValidationEntry *ve = value;
1975 if (session == ve->session)
1982 * Function that will be called whenever the plugin internally
1983 * cleans up a session pointer and hence the service needs to
1984 * discard all of those sessions as well. Plugins that do not
1985 * use sessions can simply omit calling this function and always
1986 * use NULL wherever a session pointer is needed.
1988 * @param cls closure
1989 * @param peer which peer was the session for
1990 * @param session which session is being destoyed
1993 plugin_env_session_end (void *cls,
1994 const struct GNUNET_PeerIdentity *peer,
1995 struct Session *session)
1997 struct TransportPlugin *p = cls;
1998 struct NeighbourList *nl;
1999 struct ReadyList *rl;
2000 struct ForeignAddressList *pos;
2001 struct ForeignAddressList *prev;
2003 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2004 &remove_session_validations,
2006 nl = find_neighbour (peer);
2012 if (rl->plugin == p)
2019 pos = rl->addresses;
2020 while ( (pos != NULL) &&
2021 (pos->session != session) )
2028 pos->session = NULL;
2029 if (pos->addrlen != 0)
2032 rl->addresses = pos->next;
2034 prev->next = pos->next;
2035 if (GNUNET_SCHEDULER_NO_TASK != pos->revalidate_task)
2037 GNUNET_SCHEDULER_cancel (sched,
2038 pos->revalidate_task);
2039 pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2042 if (nl->received_pong == GNUNET_NO)
2043 return; /* nothing to do */
2044 /* check if we have any validated addresses left */
2045 pos = rl->addresses;
2052 /* no valid addresses left, signal disconnect! */
2053 disconnect_neighbour (nl, GNUNET_NO);
2058 * Function that must be called by each plugin to notify the
2059 * transport service about the addresses under which the transport
2060 * provided by the plugin can be reached.
2062 * @param cls closure
2063 * @param name name of the transport that generated the address
2064 * @param addr one of the addresses of the host, NULL for the last address
2065 * the specific address format depends on the transport
2066 * @param addrlen length of the address
2067 * @param expires when should this address automatically expire?
2070 plugin_env_notify_address (void *cls,
2074 struct GNUNET_TIME_Relative expires)
2076 struct TransportPlugin *p = cls;
2077 struct OwnAddressList *al;
2078 struct GNUNET_TIME_Absolute abex;
2080 GNUNET_assert (addr != NULL);
2081 abex = GNUNET_TIME_relative_to_absolute (expires);
2082 GNUNET_assert (p == find_transport (name));
2086 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
2088 if (al->expires.value < abex.value)
2095 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
2097 al->next = p->addresses;
2100 al->addrlen = addrlen;
2101 memcpy (&al[1], addr, addrlen);
2102 update_addresses (p, GNUNET_YES);
2107 * Notify all of our clients about a peer connecting.
2110 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
2111 struct GNUNET_TIME_Relative latency,
2114 struct ConnectInfoMessage cim;
2115 struct TransportClient *cpos;
2118 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2119 "Notifying clients about connection from `%s'\n",
2122 GNUNET_STATISTICS_update (stats,
2123 gettext_noop ("# peers connected"),
2126 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2127 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2128 cim.distance = htonl (distance);
2129 cim.latency = GNUNET_TIME_relative_hton (latency);
2130 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
2132 while (cpos != NULL)
2134 transmit_to_client (cpos, &cim.header, GNUNET_NO);
2141 * Notify all of our clients about a peer disconnecting.
2144 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2146 struct DisconnectInfoMessage dim;
2147 struct TransportClient *cpos;
2150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2151 "Notifying clients about lost connection to `%s'\n",
2154 GNUNET_STATISTICS_update (stats,
2155 gettext_noop ("# peers connected"),
2158 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2159 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2160 dim.reserved = htonl (0);
2161 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2163 while (cpos != NULL)
2165 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2172 * Find a ForeignAddressList entry for the given neighbour
2173 * that matches the given address and transport.
2175 * @param neighbour which peer we care about
2176 * @param tname name of the transport plugin
2177 * @param session session to look for, NULL for 'any'; otherwise
2178 * can be used for the service to "learn" this session ID
2180 * @param addr binary address
2181 * @param addrlen length of addr
2182 * @return NULL if no such entry exists
2184 static struct ForeignAddressList *
2185 find_peer_address(struct NeighbourList *neighbour,
2187 struct Session *session,
2191 struct ReadyList *head;
2192 struct ForeignAddressList *pos;
2194 head = neighbour->plugins;
2195 while (head != NULL)
2197 if (0 == strcmp (tname, head->plugin->short_name))
2203 pos = head->addresses;
2204 while ( (pos != NULL) &&
2205 ( (pos->addrlen != addrlen) ||
2206 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2208 if ( (session != NULL) &&
2209 (pos->session == session) )
2213 if ( (session != NULL) && (pos != NULL) )
2214 pos->session = session; /* learn it! */
2220 * Get the peer address struct for the given neighbour and
2221 * address. If it doesn't yet exist, create it.
2223 * @param neighbour which peer we care about
2224 * @param tname name of the transport plugin
2225 * @param session session of the plugin, or NULL for none
2226 * @param addr binary address
2227 * @param addrlen length of addr
2228 * @return NULL if we do not have a transport plugin for 'tname'
2230 static struct ForeignAddressList *
2231 add_peer_address (struct NeighbourList *neighbour,
2233 struct Session *session,
2237 struct ReadyList *head;
2238 struct ForeignAddressList *ret;
2240 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2243 head = neighbour->plugins;
2245 while (head != NULL)
2247 if (0 == strcmp (tname, head->plugin->short_name))
2253 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2254 ret->session = session;
2257 ret->addr = (const char*) &ret[1];
2258 memcpy (&ret[1], addr, addrlen);
2264 ret->addrlen = addrlen;
2265 ret->expires = GNUNET_TIME_relative_to_absolute
2266 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2267 ret->latency = GNUNET_TIME_relative_get_forever();
2269 ret->timeout = GNUNET_TIME_relative_to_absolute
2270 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2271 ret->ready_list = head;
2272 ret->next = head->addresses;
2273 head->addresses = ret;
2279 * Closure for 'add_validated_address'.
2281 struct AddValidatedAddressContext
2284 * Entry that has been validated.
2286 const struct ValidationEntry *ve;
2289 * Flag set after we have added the address so
2290 * that we terminate the iteration next time.
2297 * Callback function used to fill a buffer of max bytes with a list of
2298 * addresses in the format used by HELLOs. Should use
2299 * "GNUNET_HELLO_add_address" as a helper function.
2301 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2302 * @param max maximum number of bytes that can be written to buf
2303 * @param buf where to write the address information
2304 * @return number of bytes written, 0 to signal the
2305 * end of the iteration.
2308 add_validated_address (void *cls,
2309 size_t max, void *buf)
2311 struct AddValidatedAddressContext *avac = cls;
2312 const struct ValidationEntry *ve = avac->ve;
2314 if (GNUNET_YES == avac->done)
2316 avac->done = GNUNET_YES;
2317 return GNUNET_HELLO_add_address (ve->transport_name,
2318 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2328 * Closure for 'check_address_exists'.
2330 struct CheckAddressExistsClosure
2333 * Address to check for.
2338 * Name of the transport.
2345 struct Session *session;
2348 * Set to GNUNET_YES if the address exists.
2361 * Iterator over hash map entries. Checks if the given
2362 * validation entry is for the same address as what is given
2365 * @param cls the 'struct CheckAddressExistsClosure*'
2366 * @param key current key code (ignored)
2367 * @param value value in the hash map ('struct ValidationEntry')
2368 * @return GNUNET_YES if we should continue to
2369 * iterate (mismatch), GNUNET_NO if not (entry matched)
2372 check_address_exists (void *cls,
2373 const GNUNET_HashCode * key,
2376 struct CheckAddressExistsClosure *caec = cls;
2377 struct ValidationEntry *ve = value;
2379 if ( (0 == strcmp (caec->tname,
2380 ve->transport_name)) &&
2381 (caec->addrlen == ve->addrlen) &&
2382 (0 == memcmp (caec->addr,
2386 caec->exists = GNUNET_YES;
2389 if ( (ve->session != NULL) &&
2390 (caec->session == ve->session) )
2392 caec->exists = GNUNET_YES;
2401 * Iterator to free entries in the validation_map.
2403 * @param cls closure (unused)
2404 * @param key current key code
2405 * @param value value in the hash map (validation to abort)
2406 * @return GNUNET_YES (always)
2409 abort_validation (void *cls,
2410 const GNUNET_HashCode * key,
2413 struct ValidationEntry *va = value;
2415 if (GNUNET_SCHEDULER_NO_TASK != va->timeout_task)
2416 GNUNET_SCHEDULER_cancel (sched, va->timeout_task);
2417 GNUNET_free (va->transport_name);
2418 if (va->chvc != NULL)
2420 va->chvc->ve_count--;
2421 if (va->chvc->ve_count == 0)
2423 GNUNET_CONTAINER_DLL_remove (chvc_head,
2426 GNUNET_free (va->chvc);
2436 * HELLO validation cleanup task (validation failed).
2438 * @param cls the 'struct ValidationEntry' that failed
2439 * @param tc scheduler context (unused)
2442 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2444 struct ValidationEntry *va = cls;
2445 struct GNUNET_PeerIdentity pid;
2447 va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2448 GNUNET_STATISTICS_update (stats,
2449 gettext_noop ("# address validation timeouts"),
2452 GNUNET_CRYPTO_hash (&va->publicKey,
2454 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2456 GNUNET_break (GNUNET_OK ==
2457 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2460 abort_validation (NULL, NULL, va);
2465 neighbour_timeout_task (void *cls,
2466 const struct GNUNET_SCHEDULER_TaskContext *tc)
2468 struct NeighbourList *n = cls;
2471 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2472 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2474 GNUNET_STATISTICS_update (stats,
2475 gettext_noop ("# disconnects due to timeout"),
2478 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2479 disconnect_neighbour (n, GNUNET_NO);
2484 * Schedule the job that will cause us to send a PING to the
2485 * foreign address to evaluate its validity and latency.
2487 * @param fal address to PING
2490 schedule_next_ping (struct ForeignAddressList *fal);
2494 * Add the given address to the list of foreign addresses
2495 * available for the given peer (check for duplicates).
2497 * @param cls the respective 'struct NeighbourList' to update
2498 * @param tname name of the transport
2499 * @param expiration expiration time
2500 * @param addr the address
2501 * @param addrlen length of the address
2502 * @return GNUNET_OK (always)
2505 add_to_foreign_address_list (void *cls,
2507 struct GNUNET_TIME_Absolute expiration,
2511 struct NeighbourList *n = cls;
2512 struct ForeignAddressList *fal;
2515 GNUNET_STATISTICS_update (stats,
2516 gettext_noop ("# valid peer addresses returned by PEERINFO"),
2520 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2524 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2525 "Adding address `%s' (%s) for peer `%4s' due to PEERINFO data for %llums.\n",
2526 a2s (tname, addr, addrlen),
2528 GNUNET_i2s (&n->id),
2531 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2534 GNUNET_STATISTICS_update (stats,
2535 gettext_noop ("# previously validated addresses lacking transport"),
2541 fal->expires = GNUNET_TIME_absolute_max (expiration,
2543 schedule_next_ping (fal);
2549 fal->expires = GNUNET_TIME_absolute_max (expiration,
2554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2555 "Failed to add new address for `%4s'\n",
2556 GNUNET_i2s (&n->id));
2559 if (fal->validated == GNUNET_NO)
2561 fal->validated = GNUNET_YES;
2562 GNUNET_STATISTICS_update (stats,
2563 gettext_noop ("# peer addresses considered valid"),
2567 if (try == GNUNET_YES)
2569 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2570 "Have new addresses, will try to trigger transmissions.\n");
2571 try_transmission_to_peer (n);
2578 * Add addresses in validated HELLO "h" to the set of addresses
2579 * we have for this peer.
2581 * @param cls closure ('struct NeighbourList*')
2582 * @param peer id of the peer, NULL for last call
2583 * @param h hello message for the peer (can be NULL)
2584 * @param trust amount of trust we have in the peer (not used)
2587 add_hello_for_peer (void *cls,
2588 const struct GNUNET_PeerIdentity *peer,
2589 const struct GNUNET_HELLO_Message *h,
2592 struct NeighbourList *n = cls;
2600 return; /* no HELLO available */
2602 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2603 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2607 if (GNUNET_YES != n->public_key_valid)
2609 GNUNET_HELLO_get_key (h, &n->publicKey);
2610 n->public_key_valid = GNUNET_YES;
2612 GNUNET_HELLO_iterate_addresses (h,
2614 &add_to_foreign_address_list,
2620 * Create a fresh entry in our neighbour list for the given peer.
2621 * Will try to transmit our current HELLO to the new neighbour.
2622 * Do not call this function directly, use 'setup_peer_check_blacklist.
2624 * @param peer the peer for which we create the entry
2625 * @param do_hello should we schedule transmitting a HELLO
2626 * @return the new neighbour list entry
2628 static struct NeighbourList *
2629 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2632 struct NeighbourList *n;
2633 struct TransportPlugin *tp;
2634 struct ReadyList *rl;
2637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2638 "Setting up state for neighbour `%4s'\n",
2641 GNUNET_assert (our_hello != NULL);
2642 GNUNET_STATISTICS_update (stats,
2643 gettext_noop ("# active neighbours"),
2646 n = GNUNET_malloc (sizeof (struct NeighbourList));
2647 n->next = neighbours;
2651 GNUNET_TIME_relative_to_absolute
2652 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2653 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2654 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2655 MAX_BANDWIDTH_CARRY_S);
2659 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2661 rl = GNUNET_malloc (sizeof (struct ReadyList));
2663 rl->next = n->plugins;
2666 rl->addresses = NULL;
2670 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2672 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2673 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2674 &neighbour_timeout_task, n);
2677 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2678 0, GNUNET_TIME_UNIT_FOREVER_REL,
2679 &add_hello_for_peer, n);
2680 transmit_to_peer (NULL, NULL, 0,
2681 HELLO_ADDRESS_EXPIRATION,
2682 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2690 * Function called after we have checked if communicating
2691 * with a given peer is acceptable.
2693 * @param cls closure
2694 * @param n NULL if communication is not acceptable
2696 typedef void (*SetupContinuation)(void *cls,
2697 struct NeighbourList *n);
2701 * Information kept for each client registered to perform
2707 * This is a linked list.
2709 struct Blacklisters *next;
2712 * This is a linked list.
2714 struct Blacklisters *prev;
2717 * Client responsible for this entry.
2719 struct GNUNET_SERVER_Client *client;
2722 * Blacklist check that we're currently performing.
2724 struct BlacklistCheck *bc;
2730 * Head of DLL of blacklisting clients.
2732 static struct Blacklisters *bl_head;
2735 * Tail of DLL of blacklisting clients.
2737 static struct Blacklisters *bl_tail;
2741 * Context we use when performing a blacklist check.
2743 struct BlacklistCheck
2747 * This is a linked list.
2749 struct BlacklistCheck *next;
2752 * This is a linked list.
2754 struct BlacklistCheck *prev;
2757 * Peer being checked.
2759 struct GNUNET_PeerIdentity peer;
2762 * Option for setup neighbour afterwards.
2767 * Continuation to call with the result.
2769 SetupContinuation cont;
2777 * Current transmission request handle for this client, or NULL if no
2778 * request is pending.
2780 struct GNUNET_CONNECTION_TransmitHandle *th;
2783 * Our current position in the blacklisters list.
2785 struct Blacklisters *bl_pos;
2788 * Current task performing the check.
2790 GNUNET_SCHEDULER_TaskIdentifier task;
2795 * Head of DLL of active blacklisting queries.
2797 static struct BlacklistCheck *bc_head;
2800 * Tail of DLL of active blacklisting queries.
2802 static struct BlacklistCheck *bc_tail;
2806 * Perform next action in the blacklist check.
2808 * @param cls the 'struct BlacklistCheck*'
2812 do_blacklist_check (void *cls,
2813 const struct GNUNET_SCHEDULER_TaskContext *tc);
2817 * Transmit blacklist query to the client.
2819 * @param cls the 'struct BlacklistCheck'
2820 * @param size number of bytes allowed
2821 * @param buf where to copy the message
2822 * @return number of bytes copied to buf
2825 transmit_blacklist_message (void *cls,
2829 struct BlacklistCheck *bc = cls;
2830 struct Blacklisters *bl;
2831 struct BlacklistMessage bm;
2836 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2837 bc->task = GNUNET_SCHEDULER_add_now (sched,
2838 &do_blacklist_check,
2843 bm.header.size = htons (sizeof (struct BlacklistMessage));
2844 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2845 bm.is_allowed = htonl (0);
2847 memcpy (buf, &bm, sizeof (bm));
2848 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2854 * Perform next action in the blacklist check.
2856 * @param cls the 'struct BlacklistCheck*'
2860 do_blacklist_check (void *cls,
2861 const struct GNUNET_SCHEDULER_TaskContext *tc)
2863 struct BlacklistCheck *bc = cls;
2864 struct Blacklisters *bl;
2866 bc->task = GNUNET_SCHEDULER_NO_TASK;
2870 bc->cont (bc->cont_cls,
2871 setup_new_neighbour (&bc->peer, bc->do_hello));
2878 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
2879 sizeof (struct BlacklistMessage),
2880 GNUNET_TIME_UNIT_FOREVER_REL,
2881 &transmit_blacklist_message,
2888 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
2889 * does not yet exist, check the blacklist. If the blacklist says creating
2890 * one is acceptable, create one and call the continuation; otherwise
2891 * call the continuation with NULL.
2893 * @param peer peer to setup or look up a struct NeighbourList for
2894 * @param do_hello should we also schedule sending our HELLO to the peer
2895 * if this is a new record
2896 * @param cont function to call with the 'struct NeigbhbourList*'
2897 * @param cont_cls closure for cont
2900 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
2902 SetupContinuation cont,
2905 struct NeighbourList *n;
2906 struct BlacklistCheck *bc;
2908 n = find_neighbour(peer);
2914 if (bl_head == NULL)
2917 setup_new_neighbour (peer, do_hello));
2920 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
2921 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
2923 bc->do_hello = do_hello;
2925 bc->cont_cls = cont_cls;
2926 bc->bl_pos = bl_head;
2927 bc->task = GNUNET_SCHEDULER_add_now (sched,
2928 &do_blacklist_check,
2934 * Function called with the result of querying a new blacklister about
2935 * it being allowed (or not) to continue to talk to an existing neighbour.
2937 * @param cls the original 'struct NeighbourList'
2938 * @param n NULL if we need to disconnect
2941 confirm_or_drop_neighbour (void *cls,
2942 struct NeighbourList *n)
2944 struct NeighbourList * orig = cls;
2947 disconnect_neighbour (orig, GNUNET_NO);
2952 * Handle a request to start a blacklist.
2954 * @param cls closure (always NULL)
2955 * @param client identification of the client
2956 * @param message the actual message
2959 handle_blacklist_init (void *cls,
2960 struct GNUNET_SERVER_Client *client,
2961 const struct GNUNET_MessageHeader *message)
2963 struct Blacklisters *bl;
2964 struct BlacklistCheck *bc;
2965 struct NeighbourList *n;
2970 if (bl->client == client)
2973 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2978 bl = GNUNET_malloc (sizeof (struct Blacklisters));
2979 bl->client = client;
2980 GNUNET_SERVER_client_keep (client);
2981 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
2982 /* confirm that all existing connections are OK! */
2986 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
2987 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
2989 bc->do_hello = GNUNET_NO;
2990 bc->cont = &confirm_or_drop_neighbour;
2993 if (n == neighbours) /* all would wait for the same client, no need to
2994 create more than just the first task right now */
2995 bc->task = GNUNET_SCHEDULER_add_now (sched,
2996 &do_blacklist_check,
3004 * Handle a request to blacklist a peer.
3006 * @param cls closure (always NULL)
3007 * @param client identification of the client
3008 * @param message the actual message
3011 handle_blacklist_reply (void *cls,
3012 struct GNUNET_SERVER_Client *client,
3013 const struct GNUNET_MessageHeader *message)
3015 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
3016 struct Blacklisters *bl;
3017 struct BlacklistCheck *bc;
3020 while ( (bl != NULL) &&
3021 (bl->client != client) )
3025 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3030 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
3032 bc->cont (bc->cont_cls, NULL);
3033 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
3038 bc->bl_pos = bc->bl_pos->next;
3039 bc->task = GNUNET_SCHEDULER_add_now (sched,
3040 &do_blacklist_check,
3043 /* check if any other bc's are waiting for this blacklister */
3047 if ( (bc->bl_pos == bl) &&
3048 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
3049 bc->task = GNUNET_SCHEDULER_add_now (sched,
3050 &do_blacklist_check,
3058 * Send periodic PING messages to a given foreign address.
3060 * @param cls our 'struct PeriodicValidationContext*'
3061 * @param tc task context
3064 send_periodic_ping (void *cls,
3065 const struct GNUNET_SCHEDULER_TaskContext *tc)
3067 struct ForeignAddressList *peer_address = cls;
3068 struct TransportPlugin *tp;
3069 struct ValidationEntry *va;
3070 struct NeighbourList *neighbour;
3071 struct TransportPingMessage ping;
3072 struct CheckAddressExistsClosure caec;
3074 uint16_t hello_size;
3077 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3078 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3080 tp = peer_address->ready_list->plugin;
3081 neighbour = peer_address->ready_list->neighbour;
3082 if (GNUNET_YES != neighbour->public_key_valid)
3084 /* no public key yet, try again later */
3085 schedule_next_ping (peer_address);
3088 caec.addr = peer_address->addr;
3089 caec.addrlen = peer_address->addrlen;
3090 caec.tname = tp->short_name;
3091 caec.session = peer_address->session;
3092 caec.exists = GNUNET_NO;
3093 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3094 &check_address_exists,
3096 if (caec.exists == GNUNET_YES)
3098 /* During validation attempts we will likely trigger the other
3099 peer trying to validate our address which in turn will cause
3100 it to send us its HELLO, so we expect to hit this case rather
3101 frequently. Only print something if we are very verbose. */
3102 #if DEBUG_TRANSPORT > 1
3103 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3104 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3105 (peer_address->addr != NULL)
3106 ? a2s (tp->short_name,
3108 peer_address->addrlen)
3111 GNUNET_i2s (&neighbour->id));
3113 schedule_next_ping (peer_address);
3116 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3117 va->transport_name = GNUNET_strdup (tp->short_name);
3118 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3120 va->send_time = GNUNET_TIME_absolute_get();
3121 va->session = peer_address->session;
3122 if (peer_address->addr != NULL)
3124 va->addr = (const void*) &va[1];
3125 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3126 va->addrlen = peer_address->addrlen;
3128 memcpy(&va->publicKey,
3129 &neighbour->publicKey,
3130 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3132 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3133 HELLO_VERIFICATION_TIMEOUT,
3134 &timeout_hello_validation,
3136 GNUNET_CONTAINER_multihashmap_put (validation_map,
3137 &neighbour->id.hashPubKey,
3139 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3140 hello_size = GNUNET_HELLO_size(our_hello);
3141 tsize = sizeof(struct TransportPingMessage) + hello_size;
3142 message_buf = GNUNET_malloc(tsize);
3143 ping.challenge = htonl(va->challenge);
3144 ping.header.size = htons(sizeof(struct TransportPingMessage));
3145 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3146 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3147 memcpy(message_buf, our_hello, hello_size);
3148 memcpy(&message_buf[hello_size],
3150 sizeof(struct TransportPingMessage));
3151 #if DEBUG_TRANSPORT_REVALIDATION
3152 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3153 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3154 (peer_address->addr != NULL)
3155 ? a2s (peer_address->plugin->short_name,
3157 peer_address->addrlen)
3160 GNUNET_i2s (&neighbour->id),
3161 "HELLO", hello_size,
3162 "PING", sizeof (struct TransportPingMessage));
3164 GNUNET_STATISTICS_update (stats,
3165 gettext_noop ("# PING messages sent for re-validation"),
3168 transmit_to_peer (NULL, peer_address,
3169 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3170 HELLO_VERIFICATION_TIMEOUT,
3172 GNUNET_YES, neighbour);
3173 GNUNET_free(message_buf);
3174 schedule_next_ping (peer_address);
3179 * Schedule the job that will cause us to send a PING to the
3180 * foreign address to evaluate its validity and latency.
3182 * @param fal address to PING
3185 schedule_next_ping (struct ForeignAddressList *fal)
3187 struct GNUNET_TIME_Relative delay;
3189 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3191 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3192 delay.value /= 2; /* do before expiration */
3193 delay = GNUNET_TIME_relative_min (delay,
3194 LATENCY_EVALUATION_MAX_DELAY);
3195 if (GNUNET_YES != fal->estimated)
3197 delay = GNUNET_TIME_UNIT_ZERO;
3198 fal->estimated = GNUNET_YES;
3200 if (GNUNET_YES == fal->connected)
3202 delay = GNUNET_TIME_relative_min (delay,
3203 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3205 /* FIXME: also adjust delay based on how close the last
3206 observed latency is to the latency of the best alternative */
3207 /* bound how fast we can go */
3208 delay = GNUNET_TIME_relative_max (delay,
3209 GNUNET_TIME_UNIT_SECONDS);
3210 /* randomize a bit (to avoid doing all at the same time) */
3211 delay.value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3212 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(sched,
3214 &send_periodic_ping,
3222 * Function that will be called if we receive some payload
3223 * from another peer.
3225 * @param message the payload
3226 * @param n peer who claimed to be the sender
3229 handle_payload_message (const struct GNUNET_MessageHeader *message,
3230 struct NeighbourList *n)
3232 struct InboundMessage *im;
3233 struct TransportClient *cpos;
3236 msize = ntohs (message->size);
3237 if (n->received_pong == GNUNET_NO)
3239 GNUNET_free_non_null (n->pre_connect_message_buffer);
3240 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3241 memcpy (n->pre_connect_message_buffer, message, msize);
3245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3246 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
3247 ntohs (message->type),
3248 ntohs (message->size),
3249 GNUNET_i2s (&n->id));
3251 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3254 n->quota_violation_count++;
3256 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3257 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3258 n->in_tracker.available_bytes_per_s__,
3259 n->quota_violation_count);
3261 /* Discount 32k per violation */
3262 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3267 if (n->quota_violation_count > 0)
3269 /* try to add 32k back */
3270 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3272 n->quota_violation_count--;
3275 GNUNET_STATISTICS_update (stats,
3276 gettext_noop ("# payload received from other peers"),
3279 /* transmit message to all clients */
3280 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3281 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3282 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3283 im->latency = GNUNET_TIME_relative_hton (n->latency);
3285 im->distance = ntohl(n->distance);
3286 memcpy (&im[1], message, msize);
3288 while (cpos != NULL)
3290 transmit_to_client (cpos, &im->header, GNUNET_YES);
3298 * Iterator over hash map entries. Checks if the given validation
3299 * entry is for the same challenge as what is given in the PONG.
3301 * @param cls the 'struct TransportPongMessage*'
3302 * @param key peer identity
3303 * @param value value in the hash map ('struct ValidationEntry')
3304 * @return GNUNET_YES if we should continue to
3305 * iterate (mismatch), GNUNET_NO if not (entry matched)
3308 check_pending_validation (void *cls,
3309 const GNUNET_HashCode * key,
3312 const struct TransportPongMessage *pong = cls;
3313 struct ValidationEntry *ve = value;
3314 struct AddValidatedAddressContext avac;
3315 unsigned int challenge = ntohl(pong->challenge);
3316 struct GNUNET_HELLO_Message *hello;
3317 struct GNUNET_PeerIdentity target;
3318 struct NeighbourList *n;
3319 struct ForeignAddressList *fal;
3320 struct GNUNET_MessageHeader *prem;
3322 if (ve->challenge != challenge)
3327 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PING,
3332 GNUNET_break_op (0);
3338 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3339 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
3342 ? a2s (ve->transport_name,
3343 (const struct sockaddr *) ve->addr,
3346 ve->transport_name);
3348 GNUNET_STATISTICS_update (stats,
3349 gettext_noop ("# address validation successes"),
3352 /* create the updated HELLO */
3353 GNUNET_CRYPTO_hash (&ve->publicKey,
3354 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3355 &target.hashPubKey);
3356 if (ve->addr != NULL)
3358 avac.done = GNUNET_NO;
3360 hello = GNUNET_HELLO_create (&ve->publicKey,
3361 &add_validated_address,
3363 GNUNET_PEERINFO_add_peer (peerinfo,
3365 GNUNET_free (hello);
3367 n = find_neighbour (&target);
3370 n->publicKey = ve->publicKey;
3371 n->public_key_valid = GNUNET_YES;
3372 fal = add_peer_address (n,
3377 GNUNET_assert (fal != NULL);
3378 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
3379 fal->validated = GNUNET_YES;
3380 mark_address_connected (fal);
3381 GNUNET_STATISTICS_update (stats,
3382 gettext_noop ("# peer addresses considered valid"),
3385 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
3386 schedule_next_ping (fal);
3387 if (n->latency.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
3388 n->latency = fal->latency;
3390 n->latency.value = (fal->latency.value + n->latency.value) / 2;
3392 n->distance = fal->distance;
3393 if (GNUNET_NO == n->received_pong)
3395 n->received_pong = GNUNET_YES;
3396 notify_clients_connect (&target, n->latency, n->distance);
3397 if (NULL != (prem = n->pre_connect_message_buffer))
3399 n->pre_connect_message_buffer = NULL;
3400 handle_payload_message (prem, n);
3404 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3406 GNUNET_SCHEDULER_cancel (sched,
3408 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3409 try_transmission_to_peer (n);
3413 /* clean up validation entry */
3414 GNUNET_assert (GNUNET_YES ==
3415 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3418 abort_validation (NULL, NULL, ve);
3424 * Function that will be called if we receive a validation
3425 * of an address challenge that we transmitted to another
3426 * peer. Note that the validation should only be considered
3427 * acceptable if the challenge matches AND if the sender
3428 * address is at least a plausible address for this peer
3429 * (otherwise we may be seeing a MiM attack).
3431 * @param cls closure
3432 * @param message the pong message
3433 * @param peer who responded to our challenge
3434 * @param sender_address string describing our sender address (as observed
3435 * by the other peer in binary format)
3436 * @param sender_address_len number of bytes in 'sender_address'
3439 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3440 const struct GNUNET_PeerIdentity *peer,
3441 const char *sender_address,
3442 size_t sender_address_len)
3444 #if DEBUG_TRANSPORT > 1
3445 /* we get tons of these that just get discarded, only log
3446 if we are quite verbose */
3447 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3448 "Receiving `%s' message from `%4s'.\n", "PONG",
3451 GNUNET_STATISTICS_update (stats,
3452 gettext_noop ("# PONG messages received"),
3455 if (GNUNET_SYSERR !=
3456 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3458 &check_pending_validation,
3461 /* This is *expected* to happen a lot since we send
3462 PONGs to *all* known addresses of the sender of
3463 the PING, so most likely we get multiple PONGs
3464 per PING, and all but the first PONG will end up
3465 here. So really we should not print anything here
3466 unless we want to be very, very verbose... */
3467 #if DEBUG_TRANSPORT > 2
3468 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3469 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3481 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3483 * @param cls the 'struct ValidationEntry*'
3484 * @param neighbour neighbour to validate, NULL if validation failed
3487 transmit_hello_and_ping (void *cls,
3488 struct NeighbourList *neighbour)
3490 struct ValidationEntry *va = cls;
3491 struct ForeignAddressList *peer_address;
3492 struct TransportPingMessage ping;
3493 uint16_t hello_size;
3496 struct GNUNET_PeerIdentity id;
3498 GNUNET_CRYPTO_hash (&va->publicKey,
3499 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3501 if (neighbour == NULL)
3503 /* FIXME: stats... */
3504 GNUNET_break (GNUNET_OK ==
3505 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3508 abort_validation (NULL, NULL, va);
3511 neighbour->publicKey = va->publicKey;
3512 neighbour->public_key_valid = GNUNET_YES;
3513 peer_address = add_peer_address (neighbour,
3514 va->transport_name, NULL,
3515 (const void*) &va[1],
3517 if (peer_address == NULL)
3519 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3520 "Failed to add peer `%4s' for plugin `%s'\n",
3521 GNUNET_i2s (&neighbour->id),
3522 va->transport_name);
3523 GNUNET_break (GNUNET_OK ==
3524 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3527 abort_validation (NULL, NULL, va);
3530 hello_size = GNUNET_HELLO_size(our_hello);
3531 tsize = sizeof(struct TransportPingMessage) + hello_size;
3532 message_buf = GNUNET_malloc(tsize);
3533 ping.challenge = htonl(va->challenge);
3534 ping.header.size = htons(sizeof(struct TransportPingMessage));
3535 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3536 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3537 memcpy(message_buf, our_hello, hello_size);
3538 memcpy(&message_buf[hello_size],
3540 sizeof(struct TransportPingMessage));
3542 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3543 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3544 a2s (va->transport_name,
3545 (const void*) &va[1], va->addrlen),
3547 GNUNET_i2s (&neighbour->id),
3548 "HELLO", hello_size,
3549 "PING", sizeof (struct TransportPingMessage));
3552 GNUNET_STATISTICS_update (stats,
3553 gettext_noop ("# PING messages sent for initial validation"),
3556 transmit_to_peer (NULL, peer_address,
3557 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3558 HELLO_VERIFICATION_TIMEOUT,
3560 GNUNET_YES, neighbour);
3561 GNUNET_free(message_buf);
3566 * Check if the given address is already being validated; if not,
3567 * append the given address to the list of entries that are being be
3568 * validated and initiate validation.
3570 * @param cls closure ('struct CheckHelloValidatedContext *')
3571 * @param tname name of the transport
3572 * @param expiration expiration time
3573 * @param addr the address
3574 * @param addrlen length of the address
3575 * @return GNUNET_OK (always)
3578 run_validation (void *cls,
3580 struct GNUNET_TIME_Absolute expiration,
3584 struct CheckHelloValidatedContext *chvc = cls;
3585 struct GNUNET_PeerIdentity id;
3586 struct TransportPlugin *tp;
3587 struct ValidationEntry *va;
3588 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3589 struct CheckAddressExistsClosure caec;
3590 struct OwnAddressList *oal;
3592 GNUNET_assert (addr != NULL);
3594 GNUNET_STATISTICS_update (stats,
3595 gettext_noop ("# peer addresses scheduled for validation"),
3598 tp = find_transport (tname);
3601 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3602 GNUNET_ERROR_TYPE_BULK,
3604 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3606 GNUNET_STATISTICS_update (stats,
3607 gettext_noop ("# peer addresses not validated (plugin not available)"),
3612 /* check if this is one of our own addresses */
3613 oal = tp->addresses;
3616 if ( (oal->addrlen == addrlen) &&
3617 (0 == memcmp (oal->addr,
3621 /* not plausible, this address is equivalent to our own address! */
3622 GNUNET_STATISTICS_update (stats,
3623 gettext_noop ("# peer addresses not validated (loopback)"),
3630 GNUNET_HELLO_get_key (chvc->hello, &pk);
3631 GNUNET_CRYPTO_hash (&pk,
3633 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3636 if (is_blacklisted(&id, tp))
3639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3640 "Attempted to validate blacklisted peer `%s' using `%s'!\n",
3648 caec.addrlen = addrlen;
3649 caec.session = NULL;
3651 caec.exists = GNUNET_NO;
3652 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3653 &check_address_exists,
3655 if (caec.exists == GNUNET_YES)
3657 /* During validation attempts we will likely trigger the other
3658 peer trying to validate our address which in turn will cause
3659 it to send us its HELLO, so we expect to hit this case rather
3660 frequently. Only print something if we are very verbose. */
3661 #if DEBUG_TRANSPORT > 1
3662 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3663 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3664 a2s (tname, addr, addrlen),
3668 GNUNET_STATISTICS_update (stats,
3669 gettext_noop ("# peer addresses not validated (in progress)"),
3674 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
3677 va->transport_name = GNUNET_strdup (tname);
3678 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3680 va->send_time = GNUNET_TIME_absolute_get();
3681 va->addr = (const void*) &va[1];
3682 memcpy (&va[1], addr, addrlen);
3683 va->addrlen = addrlen;
3684 GNUNET_HELLO_get_key (chvc->hello,
3686 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3687 HELLO_VERIFICATION_TIMEOUT,
3688 &timeout_hello_validation,
3690 GNUNET_CONTAINER_multihashmap_put (validation_map,
3693 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3694 setup_peer_check_blacklist (&id, GNUNET_NO,
3695 &transmit_hello_and_ping,
3702 * Check if addresses in validated hello "h" overlap with
3703 * those in "chvc->hello" and validate the rest.
3705 * @param cls closure
3706 * @param peer id of the peer, NULL for last call
3707 * @param h hello message for the peer (can be NULL)
3708 * @param trust amount of trust we have in the peer (not used)
3711 check_hello_validated (void *cls,
3712 const struct GNUNET_PeerIdentity *peer,
3713 const struct GNUNET_HELLO_Message *h,
3716 struct CheckHelloValidatedContext *chvc = cls;
3717 struct GNUNET_HELLO_Message *plain_hello;
3718 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3719 struct GNUNET_PeerIdentity target;
3720 struct NeighbourList *n;
3725 if (GNUNET_NO == chvc->hello_known)
3727 /* notify PEERINFO about the peer now, so that we at least
3728 have the public key if some other component needs it */
3729 GNUNET_HELLO_get_key (chvc->hello, &pk);
3730 GNUNET_CRYPTO_hash (&pk,
3731 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3732 &target.hashPubKey);
3733 plain_hello = GNUNET_HELLO_create (&pk,
3736 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
3737 GNUNET_free (plain_hello);
3739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3740 "PEERINFO had no `%s' message for peer `%4s', full validation needed.\n",
3742 GNUNET_i2s (&target));
3744 GNUNET_STATISTICS_update (stats,
3745 gettext_noop ("# new HELLOs requiring full validation"),
3748 GNUNET_HELLO_iterate_addresses (chvc->hello,
3755 GNUNET_STATISTICS_update (stats,
3756 gettext_noop ("# duplicate HELLO (peer known)"),
3761 if (chvc->ve_count == 0)
3763 GNUNET_CONTAINER_DLL_remove (chvc_head,
3773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3774 "PEERINFO had `%s' message for peer `%4s', validating only new addresses.\n",
3778 chvc->hello_known = GNUNET_YES;
3779 n = find_neighbour (peer);
3782 GNUNET_HELLO_iterate_addresses (h,
3784 &add_to_foreign_address_list,
3786 try_transmission_to_peer (n);
3790 GNUNET_STATISTICS_update (stats,
3791 gettext_noop ("# no existing neighbour record (validating HELLO)"),
3795 GNUNET_STATISTICS_update (stats,
3796 gettext_noop ("# HELLO validations (update case)"),
3799 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
3801 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
3808 * Process HELLO-message.
3810 * @param plugin transport involved, may be NULL
3811 * @param message the actual message
3812 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
3815 process_hello (struct TransportPlugin *plugin,
3816 const struct GNUNET_MessageHeader *message)
3819 struct GNUNET_PeerIdentity target;
3820 const struct GNUNET_HELLO_Message *hello;
3821 struct CheckHelloValidatedContext *chvc;
3822 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
3824 hsize = ntohs (message->size);
3825 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
3826 (hsize < sizeof (struct GNUNET_MessageHeader)))
3829 return GNUNET_SYSERR;
3831 GNUNET_STATISTICS_update (stats,
3832 gettext_noop ("# HELLOs received for validation"),
3835 /* first, check if load is too high */
3836 if (GNUNET_SCHEDULER_get_load (sched,
3837 GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
3839 GNUNET_STATISTICS_update (stats,
3840 gettext_noop ("# HELLOs ignored due to high load"),
3845 hello = (const struct GNUNET_HELLO_Message *) message;
3846 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
3848 GNUNET_break_op (0);
3849 return GNUNET_SYSERR;
3851 GNUNET_CRYPTO_hash (&publicKey,
3852 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3853 &target.hashPubKey);
3854 if (0 == memcmp (&my_identity,
3856 sizeof (struct GNUNET_PeerIdentity)))
3858 GNUNET_STATISTICS_update (stats,
3859 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
3865 while (NULL != chvc)
3867 if (GNUNET_HELLO_equals (hello,
3869 GNUNET_TIME_absolute_get ()).value > 0)
3872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3873 "Received duplicate `%s' message for `%4s'; ignored\n",
3875 GNUNET_i2s (&target));
3877 return GNUNET_OK; /* validation already pending */
3879 if (GNUNET_HELLO_size(hello) == GNUNET_HELLO_size (chvc->hello))
3880 GNUNET_break (0 != memcmp (hello, chvc->hello,
3881 GNUNET_HELLO_size(hello)));
3885 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3886 "Starting validation of `%s' message for `%4s' of size %u\n",
3888 GNUNET_i2s (&target),
3889 GNUNET_HELLO_size(hello));
3891 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
3893 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
3894 memcpy (&chvc[1], hello, hsize);
3895 GNUNET_CONTAINER_DLL_insert (chvc_head,
3898 /* finally, check if HELLO was previously validated
3899 (continuation will then schedule actual validation) */
3900 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
3903 HELLO_VERIFICATION_TIMEOUT,
3904 &check_hello_validated, chvc);
3910 * The peer specified by the given neighbour has timed-out or a plugin
3911 * has disconnected. We may either need to do nothing (other plugins
3912 * still up), or trigger a full disconnect and clean up. This
3913 * function updates our state and does the necessary notifications.
3914 * Also notifies our clients that the neighbour is now officially
3917 * @param n the neighbour list entry for the peer
3918 * @param check should we just check if all plugins
3919 * disconnected or must we ask all plugins to
3923 disconnect_neighbour (struct NeighbourList *n, int check)
3925 struct ReadyList *rpos;
3926 struct NeighbourList *npos;
3927 struct NeighbourList *nprev;
3928 struct MessageQueue *mq;
3929 struct ForeignAddressList *peer_addresses;
3930 struct ForeignAddressList *peer_pos;
3932 if (GNUNET_YES == check)
3935 while (NULL != rpos)
3937 peer_addresses = rpos->addresses;
3938 while (peer_addresses != NULL)
3940 if (GNUNET_YES == peer_addresses->connected)
3941 return; /* still connected */
3942 peer_addresses = peer_addresses->next;
3948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
3949 "Disconnecting from `%4s'\n",
3950 GNUNET_i2s (&n->id));
3952 /* remove n from neighbours list */
3955 while ((npos != NULL) && (npos != n))
3960 GNUNET_assert (npos != NULL);
3962 neighbours = n->next;
3964 nprev->next = n->next;
3966 /* notify all clients about disconnect */
3967 if (GNUNET_YES == n->received_pong)
3968 notify_clients_disconnect (&n->id);
3970 /* clean up all plugins, cancel connections and pending transmissions */
3971 while (NULL != (rpos = n->plugins))
3973 n->plugins = rpos->next;
3974 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
3975 while (rpos->addresses != NULL)
3977 peer_pos = rpos->addresses;
3978 rpos->addresses = peer_pos->next;
3979 if (peer_pos->connected == GNUNET_YES)
3980 GNUNET_STATISTICS_update (stats,
3981 gettext_noop ("# connected addresses"),
3984 if (GNUNET_YES == peer_pos->validated)
3985 GNUNET_STATISTICS_update (stats,
3986 gettext_noop ("# peer addresses considered valid"),
3989 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
3991 GNUNET_SCHEDULER_cancel (sched,
3992 peer_pos->revalidate_task);
3993 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3995 GNUNET_free(peer_pos);
4000 /* free all messages on the queue */
4001 while (NULL != (mq = n->messages_head))
4003 GNUNET_STATISTICS_update (stats,
4004 gettext_noop ("# bytes in message queue for other peers"),
4005 - (int64_t) mq->message_buf_size,
4007 GNUNET_STATISTICS_update (stats,
4008 gettext_noop ("# bytes discarded due to disconnect"),
4009 mq->message_buf_size,
4011 GNUNET_CONTAINER_DLL_remove (n->messages_head,
4014 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
4016 sizeof(struct GNUNET_PeerIdentity)));
4019 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
4021 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
4022 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
4024 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
4026 GNUNET_SCHEDULER_cancel (sched, n->retry_task);
4027 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
4029 if (n->piter != NULL)
4031 GNUNET_PEERINFO_iterate_cancel (n->piter);
4034 /* finally, free n itself */
4035 GNUNET_STATISTICS_update (stats,
4036 gettext_noop ("# active neighbours"),
4039 GNUNET_free_non_null (n->pre_connect_message_buffer);
4045 * We have received a PING message from someone. Need to send a PONG message
4046 * in response to the peer by any means necessary.
4049 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
4050 const struct GNUNET_PeerIdentity *peer,
4051 const char *sender_address,
4052 uint16_t sender_address_len)
4054 struct TransportPlugin *plugin = cls;
4055 struct TransportPingMessage *ping;
4056 struct TransportPongMessage *pong;
4057 struct NeighbourList *n;
4058 struct ReadyList *rl;
4059 struct ForeignAddressList *fal;
4061 if (ntohs (message->size) != sizeof (struct TransportPingMessage))
4063 GNUNET_break_op (0);
4064 return GNUNET_SYSERR;
4067 ping = (struct TransportPingMessage *) message;
4068 if (0 != memcmp (&ping->target,
4069 plugin->env.my_identity,
4070 sizeof (struct GNUNET_PeerIdentity)))
4072 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4073 _("Received `%s' message not destined for me!\n"),
4075 return GNUNET_SYSERR;
4078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4079 "Processing `%s' from `%s'\n",
4081 (sender_address != NULL)
4082 ? a2s (plugin->short_name,
4083 (const struct sockaddr *)sender_address,
4087 GNUNET_STATISTICS_update (stats,
4088 gettext_noop ("# PING messages received"),
4091 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len);
4092 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len);
4093 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4094 pong->purpose.size =
4095 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4097 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + sender_address_len);
4098 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PING);
4099 pong->challenge = ping->challenge;
4100 pong->addrlen = htons(sender_address_len);
4101 memcpy(&pong->signer,
4103 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
4104 if (sender_address != NULL)
4105 memcpy (&pong[1], sender_address, sender_address_len);
4107 GNUNET_assert (GNUNET_OK ==
4108 GNUNET_CRYPTO_rsa_sign (my_private_key,
4109 &pong->purpose, &pong->signature));
4111 n = find_neighbour(peer);
4112 GNUNET_assert (n != NULL);
4113 /* first try reliable response transmission */
4117 fal = rl->addresses;
4120 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4123 ntohs (pong->header.size),
4124 TRANSPORT_PONG_PRIORITY,
4125 HELLO_VERIFICATION_TIMEOUT,
4133 GNUNET_STATISTICS_update (stats,
4134 gettext_noop ("# PONGs unicast via reliable transport"),
4144 /* no reliable method found, do multicast */
4145 GNUNET_STATISTICS_update (stats,
4146 gettext_noop ("# PONGs multicast to all available addresses"),
4152 fal = rl->addresses;
4155 transmit_to_peer(NULL, fal,
4156 TRANSPORT_PONG_PRIORITY,
4157 HELLO_VERIFICATION_TIMEOUT,
4159 ntohs(pong->header.size),
4172 * Function called by the plugin for each received message.
4173 * Update data volumes, possibly notify plugins about
4174 * reducing the rate at which they read from the socket
4175 * and generally forward to our receive callback.
4177 * @param cls the "struct TransportPlugin *" we gave to the plugin
4178 * @param peer (claimed) identity of the other peer
4179 * @param message the message, NULL if we only care about
4180 * learning about the delay until we should receive again
4181 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
4182 * @param session identifier used for this session (can be NULL)
4183 * @param sender_address binary address of the sender (if observed)
4184 * @param sender_address_len number of bytes in sender_address
4185 * @return how long the plugin should wait until receiving more data
4186 * (plugins that do not support this, can ignore the return value)
4188 static struct GNUNET_TIME_Relative
4189 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4190 const struct GNUNET_MessageHeader *message,
4192 struct Session *session,
4193 const char *sender_address,
4194 uint16_t sender_address_len)
4196 struct TransportPlugin *plugin = cls;
4197 struct ReadyList *service_context;
4198 struct ForeignAddressList *peer_address;
4200 struct NeighbourList *n;
4201 struct GNUNET_TIME_Relative ret;
4203 if (is_blacklisted (peer, plugin))
4204 return GNUNET_TIME_UNIT_FOREVER_REL;
4206 n = find_neighbour (peer);
4208 n = setup_new_neighbour (peer, GNUNET_YES);
4209 service_context = n->plugins;
4210 while ((service_context != NULL) && (plugin != service_context->plugin))
4211 service_context = service_context->next;
4212 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4213 peer_address = NULL;
4214 if (message != NULL)
4216 if ( (session != NULL) ||
4217 (sender_address != NULL) )
4218 peer_address = add_peer_address (n,
4222 sender_address_len);
4223 if (peer_address != NULL)
4225 peer_address->distance = distance;
4226 if (GNUNET_YES == peer_address->validated)
4227 mark_address_connected (peer_address);
4228 peer_address->timeout
4230 GNUNET_TIME_relative_to_absolute
4231 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4232 schedule_next_ping (peer_address);
4234 /* update traffic received amount ... */
4235 msize = ntohs (message->size);
4236 GNUNET_STATISTICS_update (stats,
4237 gettext_noop ("# bytes received from other peers"),
4240 n->distance = distance;
4242 GNUNET_TIME_relative_to_absolute
4243 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4244 GNUNET_SCHEDULER_cancel (sched,
4247 GNUNET_SCHEDULER_add_delayed (sched,
4248 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4249 &neighbour_timeout_task, n);
4250 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4252 /* dropping message due to frequent inbound volume violations! */
4253 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4254 GNUNET_ERROR_TYPE_BULK,
4256 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4257 n->in_tracker.available_bytes_per_s__,
4258 n->quota_violation_count);
4259 GNUNET_STATISTICS_update (stats,
4260 gettext_noop ("# bandwidth quota violations by other peers"),
4263 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4266 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4267 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
4268 ntohs (message->type),
4269 ntohs (message->size),
4272 switch (ntohs (message->type))
4274 case GNUNET_MESSAGE_TYPE_HELLO:
4275 GNUNET_STATISTICS_update (stats,
4276 gettext_noop ("# HELLO messages received from other peers"),
4279 process_hello (plugin, message);
4281 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4282 handle_ping (plugin, message, peer, sender_address, sender_address_len);
4284 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4285 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4288 handle_payload_message (message, n);
4292 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4295 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4296 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4297 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4298 (unsigned int) n->in_tracker.available_bytes_per_s__,
4299 (unsigned long long) ret.value);
4300 GNUNET_STATISTICS_update (stats,
4301 gettext_noop ("# ms throttling suggested"),
4302 (int64_t) ret.value,
4309 * Handle START-message. This is the first message sent to us
4310 * by any client which causes us to add it to our list.
4312 * @param cls closure (always NULL)
4313 * @param client identification of the client
4314 * @param message the actual message
4317 handle_start (void *cls,
4318 struct GNUNET_SERVER_Client *client,
4319 const struct GNUNET_MessageHeader *message)
4321 struct TransportClient *c;
4322 struct ConnectInfoMessage cim;
4323 struct NeighbourList *n;
4326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4327 "Received `%s' request from client\n", "START");
4332 if (c->client == client)
4334 /* client already on our list! */
4336 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4341 c = GNUNET_malloc (sizeof (struct TransportClient));
4345 if (our_hello != NULL)
4348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4349 "Sending our own `%s' to new client\n", "HELLO");
4351 transmit_to_client (c,
4352 (const struct GNUNET_MessageHeader *) our_hello,
4354 /* tell new client about all existing connections */
4355 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
4356 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4360 if (GNUNET_YES == n->received_pong)
4363 cim.latency = GNUNET_TIME_relative_hton (n->latency);
4364 cim.distance = htonl (n->distance);
4365 transmit_to_client (c, &cim.header, GNUNET_NO);
4370 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4375 * Handle HELLO-message.
4377 * @param cls closure (always NULL)
4378 * @param client identification of the client
4379 * @param message the actual message
4382 handle_hello (void *cls,
4383 struct GNUNET_SERVER_Client *client,
4384 const struct GNUNET_MessageHeader *message)
4388 GNUNET_STATISTICS_update (stats,
4389 gettext_noop ("# HELLOs received from clients"),
4392 ret = process_hello (NULL, message);
4393 GNUNET_SERVER_receive_done (client, ret);
4398 * Closure for 'transmit_client_message'; followed by
4399 * 'msize' bytes of the actual message.
4401 struct TransmitClientMessageContext
4404 * Client on whom's behalf we are sending.
4406 struct GNUNET_SERVER_Client *client;
4409 * Timeout for the transmission.
4411 struct GNUNET_TIME_Absolute timeout;
4419 * Size of the message in bytes.
4426 * Schedule transmission of a message we got from a client to a peer.
4428 * @param cls the 'struct TransmitClientMessageContext*'
4429 * @param n destination, or NULL on error (in that case, drop the message)
4432 transmit_client_message (void *cls,
4433 struct NeighbourList *n)
4435 struct TransmitClientMessageContext *tcmc = cls;
4436 struct TransportClient *tc;
4439 while ((tc != NULL) && (tc->client != tcmc->client))
4444 transmit_to_peer (tc, NULL, tcmc->priority,
4445 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
4447 tcmc->msize, GNUNET_NO, n);
4449 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
4450 GNUNET_SERVER_client_drop (tcmc->client);
4456 * Handle SEND-message.
4458 * @param cls closure (always NULL)
4459 * @param client identification of the client
4460 * @param message the actual message
4463 handle_send (void *cls,
4464 struct GNUNET_SERVER_Client *client,
4465 const struct GNUNET_MessageHeader *message)
4467 const struct OutboundMessage *obm;
4468 const struct GNUNET_MessageHeader *obmm;
4469 struct TransmitClientMessageContext *tcmc;
4473 size = ntohs (message->size);
4475 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
4478 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4481 GNUNET_STATISTICS_update (stats,
4482 gettext_noop ("# payload received for other peers"),
4485 obm = (const struct OutboundMessage *) message;
4486 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
4487 msize = size - sizeof (struct OutboundMessage);
4489 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4490 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
4491 "SEND", GNUNET_i2s (&obm->peer),
4495 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
4496 tcmc->client = client;
4497 tcmc->priority = ntohl (obm->priority);
4498 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
4499 tcmc->msize = msize;
4500 memcpy (&tcmc[1], obmm, msize);
4501 GNUNET_SERVER_client_keep (client);
4502 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
4503 &transmit_client_message,
4509 * Handle SET_QUOTA-message.
4511 * @param cls closure (always NULL)
4512 * @param client identification of the client
4513 * @param message the actual message
4516 handle_set_quota (void *cls,
4517 struct GNUNET_SERVER_Client *client,
4518 const struct GNUNET_MessageHeader *message)
4520 const struct QuotaSetMessage *qsm =
4521 (const struct QuotaSetMessage *) message;
4522 struct NeighbourList *n;
4524 GNUNET_STATISTICS_update (stats,
4525 gettext_noop ("# SET QUOTA messages received"),
4528 n = find_neighbour (&qsm->peer);
4531 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4532 GNUNET_STATISTICS_update (stats,
4533 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
4539 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4540 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
4542 (unsigned int) ntohl (qsm->quota.value__),
4543 (unsigned int) n->in_tracker.available_bytes_per_s__,
4544 GNUNET_i2s (&qsm->peer));
4546 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
4548 if (0 == ntohl (qsm->quota.value__))
4549 disconnect_neighbour (n, GNUNET_NO);
4550 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4555 * Take the given address and append it to the set of results sent back to
4558 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
4559 * @param address the resolved name, NULL to indicate the last response
4562 transmit_address_to_client (void *cls, const char *address)
4564 struct GNUNET_SERVER_TransmitContext *tc = cls;
4567 if (NULL == address)
4570 slen = strlen (address) + 1;
4572 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
4573 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
4574 if (NULL == address)
4575 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
4580 * Handle AddressLookup-message.
4582 * @param cls closure (always NULL)
4583 * @param client identification of the client
4584 * @param message the actual message
4587 handle_address_lookup (void *cls,
4588 struct GNUNET_SERVER_Client *client,
4589 const struct GNUNET_MessageHeader *message)
4591 const struct AddressLookupMessage *alum;
4592 struct TransportPlugin *lsPlugin;
4593 const char *nameTransport;
4594 const char *address;
4596 struct GNUNET_SERVER_TransmitContext *tc;
4597 struct GNUNET_TIME_Absolute timeout;
4598 struct GNUNET_TIME_Relative rtimeout;
4601 size = ntohs (message->size);
4602 if (size < sizeof (struct AddressLookupMessage))
4604 GNUNET_break_op (0);
4605 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4608 alum = (const struct AddressLookupMessage *) message;
4609 uint32_t addressLen = ntohl (alum->addrlen);
4610 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
4612 GNUNET_break_op (0);
4613 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4616 address = (const char *) &alum[1];
4617 nameTransport = (const char *) &address[addressLen];
4619 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
4621 GNUNET_break_op (0);
4622 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4625 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
4626 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
4627 numeric = ntohl (alum->numeric_only);
4628 lsPlugin = find_transport (nameTransport);
4629 if (NULL == lsPlugin)
4631 tc = GNUNET_SERVER_transmit_context_create (client);
4632 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
4633 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
4634 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
4637 tc = GNUNET_SERVER_transmit_context_create (client);
4638 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
4640 address, addressLen,
4643 &transmit_address_to_client, tc);
4648 * Setup the environment for this plugin.
4651 create_environment (struct TransportPlugin *plug)
4653 plug->env.cfg = cfg;
4654 plug->env.sched = sched;
4655 plug->env.my_identity = &my_identity;
4656 plug->env.cls = plug;
4657 plug->env.receive = &plugin_env_receive;
4658 plug->env.notify_address = &plugin_env_notify_address;
4659 plug->env.session_end = &plugin_env_session_end;
4660 plug->env.max_connections = max_connect_per_transport;
4661 plug->env.stats = stats;
4666 * Start the specified transport (load the plugin).
4669 start_transport (struct GNUNET_SERVER_Handle *server,
4672 struct TransportPlugin *plug;
4675 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4676 _("Loading `%s' transport plugin\n"), name);
4677 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
4678 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
4679 create_environment (plug);
4680 plug->short_name = GNUNET_strdup (name);
4681 plug->lib_name = libname;
4682 plug->next = plugins;
4684 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
4685 if (plug->api == NULL)
4687 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4688 _("Failed to load transport plugin for `%s'\n"), name);
4689 GNUNET_free (plug->short_name);
4690 plugins = plug->next;
4691 GNUNET_free (libname);
4698 * Called whenever a client is disconnected. Frees our
4699 * resources associated with that client.
4701 * @param cls closure
4702 * @param client identification of the client
4705 client_disconnect_notification (void *cls,
4706 struct GNUNET_SERVER_Client *client)
4708 struct TransportClient *pos;
4709 struct TransportClient *prev;
4710 struct ClientMessageQueueEntry *mqe;
4711 struct Blacklisters *bl;
4712 struct BlacklistCheck *bc;
4717 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4718 "Client disconnected, cleaning up.\n");
4720 /* clean up blacklister */
4724 if (bl->client == client)
4729 if (bc->bl_pos == bl)
4731 bc->bl_pos = bl->next;
4734 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
4737 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
4738 bc->task = GNUNET_SCHEDULER_add_now (sched,
4739 &do_blacklist_check,
4745 GNUNET_CONTAINER_DLL_remove (bl_head,
4748 GNUNET_SERVER_client_drop (bl->client);
4754 /* clean up 'normal' clients */
4757 while ((pos != NULL) && (pos->client != client))
4764 while (NULL != (mqe = pos->message_queue_head))
4766 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
4767 pos->message_queue_tail,
4769 pos->message_count--;
4773 clients = pos->next;
4775 prev->next = pos->next;
4776 if (GNUNET_YES == pos->tcs_pending)
4781 if (pos->th != NULL)
4783 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
4786 GNUNET_break (0 == pos->message_count);
4792 * Function called when the service shuts down. Unloads our plugins
4793 * and cancels pending validations.
4795 * @param cls closure, unused
4796 * @param tc task context (unused)
4799 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4801 struct TransportPlugin *plug;
4802 struct OwnAddressList *al;
4803 struct CheckHelloValidatedContext *chvc;
4805 while (neighbours != NULL)
4806 disconnect_neighbour (neighbours, GNUNET_NO);
4808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4809 "Transport service is unloading plugins...\n");
4811 while (NULL != (plug = plugins))
4813 plugins = plug->next;
4814 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
4816 GNUNET_SCHEDULER_cancel (plug->env.sched,
4817 plug->address_update_task);
4818 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
4820 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
4821 GNUNET_free (plug->lib_name);
4822 GNUNET_free (plug->short_name);
4823 while (NULL != (al = plug->addresses))
4825 plug->addresses = al->next;
4830 if (my_private_key != NULL)
4831 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4832 GNUNET_free_non_null (our_hello);
4834 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
4837 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4838 validation_map = NULL;
4840 /* free 'chvc' data structure */
4841 while (NULL != (chvc = chvc_head))
4843 chvc_head = chvc->next;
4844 if (chvc->piter != NULL)
4845 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
4848 GNUNET_assert (chvc->ve_count == 0);
4855 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4858 if (peerinfo != NULL)
4860 GNUNET_PEERINFO_disconnect (peerinfo);
4863 /* Can we assume those are gone by now, or do we need to clean up
4865 GNUNET_break (bl_head == NULL);
4866 GNUNET_break (bc_head == NULL);
4871 * Initiate transport service.
4873 * @param cls closure
4874 * @param s scheduler to use
4875 * @param server the initialized server
4876 * @param c configuration to use
4880 struct GNUNET_SCHEDULER_Handle *s,
4881 struct GNUNET_SERVER_Handle *server,
4882 const struct GNUNET_CONFIGURATION_Handle *c)
4884 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4885 {&handle_start, NULL,
4886 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
4887 {&handle_hello, NULL,
4888 GNUNET_MESSAGE_TYPE_HELLO, 0},
4889 {&handle_send, NULL,
4890 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
4891 {&handle_set_quota, NULL,
4892 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
4893 {&handle_address_lookup, NULL,
4894 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
4896 {&handle_blacklist_init, NULL,
4897 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
4898 {&handle_blacklist_reply, NULL,
4899 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
4905 unsigned long long tneigh;
4910 stats = GNUNET_STATISTICS_create (sched, "transport", cfg);
4911 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
4912 /* parse configuration */
4914 GNUNET_CONFIGURATION_get_value_number (c,
4919 GNUNET_CONFIGURATION_get_value_filename (c,
4921 "HOSTKEY", &keyfile)))
4923 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4925 ("Transport service is lacking key configuration settings. Exiting.\n"));
4926 GNUNET_SCHEDULER_shutdown (s);
4929 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4932 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4933 validation_map = NULL;
4936 max_connect_per_transport = (uint32_t) tneigh;
4937 peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
4938 if (peerinfo == NULL)
4940 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4941 _("Could not access PEERINFO service. Exiting.\n"));
4942 GNUNET_SCHEDULER_shutdown (s);
4945 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4948 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4949 validation_map = NULL;
4950 GNUNET_free (keyfile);
4953 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4954 GNUNET_free (keyfile);
4955 if (my_private_key == NULL)
4957 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4959 ("Transport service could not access hostkey. Exiting.\n"));
4960 GNUNET_SCHEDULER_shutdown (s);
4963 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4966 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
4967 validation_map = NULL;
4970 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4971 GNUNET_CRYPTO_hash (&my_public_key,
4972 sizeof (my_public_key), &my_identity.hashPubKey);
4973 /* setup notification */
4974 GNUNET_SERVER_disconnect_notify (server,
4975 &client_disconnect_notification, NULL);
4976 /* load plugins... */
4979 GNUNET_CONFIGURATION_get_value_string (c,
4980 "TRANSPORT", "PLUGINS", &plugs))
4982 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4983 _("Starting transport plugins `%s'\n"), plugs);
4984 pos = strtok (plugs, " ");
4987 start_transport (server, pos);
4989 pos = strtok (NULL, " ");
4991 GNUNET_free (plugs);
4993 GNUNET_SCHEDULER_add_delayed (sched,
4994 GNUNET_TIME_UNIT_FOREVER_REL,
4995 &shutdown_task, NULL);
5000 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
5002 /* If we have a blacklist file, read from it */
5003 read_blacklist_file(cfg);
5004 /* process client requests */
5005 GNUNET_SERVER_add_handlers (server, handlers);
5010 * The main function for the transport service.
5012 * @param argc number of arguments from the command line
5013 * @param argv command line arguments
5014 * @return 0 ok, 1 on error
5017 main (int argc, char *const *argv)
5019 a2s (NULL, NULL, 0); /* make compiler happy */
5020 return (GNUNET_OK ==
5021 GNUNET_SERVICE_run (argc,
5024 GNUNET_SERVICE_OPTION_NONE,
5025 &run, NULL)) ? 0 : 1;
5028 /* end of gnunet-service-transport.c */