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 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file transport/gnunet-service-transport.c
23 * @brief low-level P2P messaging
24 * @author Christian Grothoff
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 "gnunet_transport_plugin.h"
40 #include "transport.h"
42 #define DEBUG_BLACKLIST GNUNET_YES
44 #define DEBUG_PING_PONG GNUNET_YES
46 #define DEBUG_TRANSPORT_HELLO GNUNET_YES
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 * How long is a PONG signature valid? We'll recycle a signature until
105 * 1/4 of this time is remaining. PONGs should expire so that if our
106 * external addresses change an adversary cannot replay them indefinitely.
107 * OTOH, we don't want to spend too much time generating PONG signatures,
108 * so they must have some lifetime to reduce our CPU usage.
110 #define PONG_SIGNATURE_LIFETIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
113 * Priority to use for PONG messages.
115 #define TRANSPORT_PONG_PRIORITY 4
118 * How often do we re-add (cheaper) plugins to our list of plugins
119 * to try for a given connected peer?
121 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
124 * After how long do we expire an address in a HELLO that we just
125 * validated? This value is also used for our own addresses when we
128 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
132 * How long before an existing address expires should we again try to
133 * validate it? Must be (significantly) smaller than
134 * HELLO_ADDRESS_EXPIRATION.
136 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
139 * Maximum frequency for re-evaluating latencies for all transport addresses.
141 #define LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
144 * Maximum frequency for re-evaluating latencies for connected addresses.
146 #define CONNECTED_LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 1)
150 * List of addresses of other peers
152 struct ForeignAddressList
155 * This is a linked list.
157 struct ForeignAddressList *next;
160 * Which ready list does this entry belong to.
162 struct ReadyList *ready_list;
165 * How long until we auto-expire this address (unless it is
166 * re-confirmed by the transport)?
168 struct GNUNET_TIME_Absolute expires;
171 * Task used to re-validate addresses, updates latencies and
174 GNUNET_SCHEDULER_TaskIdentifier revalidate_task;
182 * Session (or NULL if no valid session currently exists or if the
183 * plugin does not use sessions).
185 struct Session *session;
188 * What was the last latency observed for this address, plugin and peer?
190 struct GNUNET_TIME_Relative latency;
193 * If we did not successfully transmit a message to the given peer
194 * via this connection during the specified time, we should consider
195 * the connection to be dead. This is used in the case that a TCP
196 * transport simply stalls writing to the stream but does not
197 * formerly get a signal that the other peer died.
199 struct GNUNET_TIME_Absolute timeout;
202 * How often have we tried to connect using this plugin? Used to
203 * discriminate against addresses that do not work well.
204 * FIXME: not yet used, but should be!
206 unsigned int connect_attempts;
209 * DV distance to this peer (1 if no DV is used).
210 * FIXME: need to set this from transport plugins!
220 * Have we ever estimated the latency of this address? Used to
221 * ensure that the first time we add an address, we immediately
227 * Are we currently connected via this address? The first time we
228 * successfully transmit or receive data to a peer via a particular
229 * address, we set this to GNUNET_YES. If we later get an error
230 * (disconnect notification, transmission failure, timeout), we set
231 * it back to GNUNET_NO.
236 * Is this plugin currently busy transmitting to the specific target?
237 * GNUNET_NO if not (initial, default state is GNUNET_NO). Internal
238 * messages do not count as 'in transmit'.
243 * Has this address been validated yet?
251 * Entry in linked list of network addresses for ourselves. Also
252 * includes a cached signature for 'struct TransportPongMessage's.
254 struct OwnAddressList
257 * This is a linked list.
259 struct OwnAddressList *next;
262 * How long until we actually auto-expire this address (unless it is
263 * re-confirmed by the transport)?
265 struct GNUNET_TIME_Absolute expires;
268 * How long until the current signature expires? (ZERO if the
269 * signature was never created).
271 struct GNUNET_TIME_Absolute pong_sig_expires;
274 * Signature for a 'struct TransportPongMessage' for this address.
276 struct GNUNET_CRYPTO_RsaSignature pong_signature;
287 * Entry in linked list of all of our plugins.
289 struct TransportPlugin
293 * This is a linked list.
295 struct TransportPlugin *next;
298 * API of the transport as returned by the plugin's
299 * initialization function.
301 struct GNUNET_TRANSPORT_PluginFunctions *api;
304 * Short name for the plugin (i.e. "tcp").
309 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
314 * List of our known addresses for this transport.
316 struct OwnAddressList *addresses;
319 * Environment this transport service is using
322 struct GNUNET_TRANSPORT_PluginEnvironment env;
325 * ID of task that is used to clean up expired addresses.
327 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
330 * Set to GNUNET_YES if we need to scrap the existing list of
331 * "addresses" and start fresh when we receive the next address
332 * update from a transport. Set to GNUNET_NO if we should just add
333 * the new address to the list and wait for the commit call.
338 * Hashmap of blacklisted peers for this particular transport.
340 struct GNUNET_CONTAINER_MultiHashMap *blacklist;
343 struct NeighbourList;
346 * For each neighbour we keep a list of messages
347 * that we still want to transmit to the neighbour.
353 * This is a doubly linked list.
355 struct MessageQueue *next;
358 * This is a doubly linked list.
360 struct MessageQueue *prev;
363 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
364 * stuck together in memory. Allocated at the end of this struct.
366 const char *message_buf;
369 * Size of the message buf
371 size_t message_buf_size;
374 * Client responsible for queueing the message;
375 * used to check that a client has no two messages
376 * pending for the same target. Can be NULL.
378 struct TransportClient *client;
381 * Using which specific address should we send this message?
383 struct ForeignAddressList *specific_address;
386 * Peer ID of the Neighbour this entry belongs to.
388 struct GNUNET_PeerIdentity neighbour_id;
391 * Plugin that we used for the transmission.
392 * NULL until we scheduled a transmission.
394 struct TransportPlugin *plugin;
397 * At what time should we fail?
399 struct GNUNET_TIME_Absolute timeout;
402 * Internal message of the transport system that should not be
403 * included in the usual SEND-SEND_OK transmission confirmation
404 * traffic management scheme. Typically, "internal_msg" will
405 * be set whenever "client" is NULL (but it is not strictly
411 * How important is the message?
413 unsigned int priority;
419 * For a given Neighbour, which plugins are available
420 * to talk to this peer and what are their costs?
425 * This is a linked list.
427 struct ReadyList *next;
430 * Which of our transport plugins does this entry
433 struct TransportPlugin *plugin;
436 * Transport addresses, latency, and readiness for
437 * this particular plugin.
439 struct ForeignAddressList *addresses;
442 * To which neighbour does this ready list belong to?
444 struct NeighbourList *neighbour;
450 * Entry in linked list of all of our current neighbours.
456 * This is a linked list.
458 struct NeighbourList *next;
461 * Which of our transports is connected to this peer
462 * and what is their status?
464 struct ReadyList *plugins;
467 * Head of list of messages we would like to send to this peer;
468 * must contain at most one message per client.
470 struct MessageQueue *messages_head;
473 * Tail of list of messages we would like to send to this peer; must
474 * contain at most one message per client.
476 struct MessageQueue *messages_tail;
479 * Buffer for at most one payload message used when we receive
480 * payload data before our PING-PONG has succeeded. We then
481 * store such messages in this intermediary buffer until the
482 * connection is fully up.
484 struct GNUNET_MessageHeader *pre_connect_message_buffer;
487 * Context for peerinfo iteration.
488 * NULL after we are done processing peerinfo's information.
490 struct GNUNET_PEERINFO_IteratorContext *piter;
493 * Public key for this peer. Valid only if the respective flag is set below.
495 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
498 * Identity of this neighbour.
500 struct GNUNET_PeerIdentity id;
503 * ID of task scheduled to run when this peer is about to
504 * time out (will free resources associated with the peer).
506 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
509 * ID of task scheduled to run when we should retry transmitting
510 * the head of the message queue. Actually triggered when the
511 * transmission is timing out (we trigger instantly when we have
512 * a chance of success).
514 GNUNET_SCHEDULER_TaskIdentifier retry_task;
517 * How long until we should consider this peer dead
518 * (if we don't receive another message in the
521 struct GNUNET_TIME_Absolute peer_timeout;
524 * Tracker for inbound bandwidth.
526 struct GNUNET_BANDWIDTH_Tracker in_tracker;
529 * The latency we have seen for this particular address for
530 * this particular peer. This latency may have been calculated
531 * over multiple transports. This value reflects how long it took
532 * us to receive a response when SENDING via this particular
533 * transport/neighbour/address combination!
535 * FIXME: we need to periodically send PINGs to update this
536 * latency (at least more often than the current "huge" (11h?)
539 struct GNUNET_TIME_Relative latency;
542 * How often has the other peer (recently) violated the
543 * inbound traffic limit? Incremented by 10 per violation,
544 * decremented by 1 per non-violation (for each
547 unsigned int quota_violation_count;
550 * DV distance to this peer (1 if no DV is used).
555 * Have we seen an PONG from this neighbour in the past (and
556 * not had a disconnect since)?
561 * Do we have a valid public key for this neighbour?
563 int public_key_valid;
568 * Message used to ask a peer to validate receipt (to check an address
569 * from a HELLO). Followed by the address we are trying to validate,
570 * or an empty address if we are just sending a PING to confirm that a
571 * connection which the receiver (of the PING) initiated is still valid.
573 struct TransportPingMessage
577 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
579 struct GNUNET_MessageHeader header;
582 * Challenge code (to ensure fresh reply).
584 uint32_t challenge GNUNET_PACKED;
587 * Who is the intended recipient?
589 struct GNUNET_PeerIdentity target;
595 * Message used to validate a HELLO. The challenge is included in the
596 * confirmation to make matching of replies to requests possible. The
597 * signature signs our public key, an expiration time and our address.<p>
599 * This message is followed by our transport address that the PING tried
600 * to confirm (if we liked it). The address can be empty (zero bytes)
601 * if the PING had not address either (and we received the request via
602 * a connection that we initiated).
604 struct TransportPongMessage
608 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
610 struct GNUNET_MessageHeader header;
613 * Challenge code from PING (showing freshness). Not part of what
614 * is signed so that we can re-use signatures.
616 uint32_t challenge GNUNET_PACKED;
621 struct GNUNET_CRYPTO_RsaSignature signature;
624 * What are we signing and why? Two possible reason codes can be here:
625 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
626 * plausible address for this peer (pid is set to identity of signer); or
627 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING to confirm that this is
628 * an address we used to connect to the peer with the given pid.
630 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
633 * When does this signature expire?
635 struct GNUNET_TIME_AbsoluteNBO expiration;
638 * Either the identity of the peer Who signed this message, or the
639 * identity of the peer that we're connected to using the given
640 * address (depending on purpose.type).
642 struct GNUNET_PeerIdentity pid;
645 * Size of address appended to this message (part of what is
646 * being signed, hence not redundant).
654 * Linked list of messages to be transmitted to the client. Each
655 * entry is followed by the actual message.
657 struct ClientMessageQueueEntry
660 * This is a doubly-linked list.
662 struct ClientMessageQueueEntry *next;
665 * This is a doubly-linked list.
667 struct ClientMessageQueueEntry *prev;
672 * Client connected to the transport service.
674 struct TransportClient
678 * This is a linked list.
680 struct TransportClient *next;
683 * Handle to the client.
685 struct GNUNET_SERVER_Client *client;
688 * Linked list of messages yet to be transmitted to
691 struct ClientMessageQueueEntry *message_queue_head;
694 * Tail of linked list of messages yet to be transmitted to the
697 struct ClientMessageQueueEntry *message_queue_tail;
700 * Current transmit request handle.
702 struct GNUNET_CONNECTION_TransmitHandle *th;
705 * Is a call to "transmit_send_continuation" pending? If so, we
706 * must not free this struct (even if the corresponding client
707 * disconnects) and instead only remove it from the linked list and
708 * set the "client" field to NULL.
713 * Length of the list of messages pending for this client.
715 unsigned int message_count;
721 * Context of currently active requests to peerinfo
722 * for validation of HELLOs.
724 struct CheckHelloValidatedContext;
728 * Entry in map of all HELLOs awaiting validation.
730 struct ValidationEntry
734 * NULL if this entry is not part of a larger HELLO validation.
736 struct CheckHelloValidatedContext *chvc;
739 * The address, actually a pointer to the end
740 * of this struct. Do not free!
745 * Name of the transport.
747 char *transport_name;
750 * The public key of the peer.
752 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
755 * ID of task that will clean up this entry if we don't succeed
756 * with the validation first.
758 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
761 * At what time did we send this validation?
763 struct GNUNET_TIME_Absolute send_time;
766 * Session being validated (or NULL for none).
768 struct Session *session;
771 * Challenge number we used.
784 * Context of currently active requests to peerinfo
785 * for validation of HELLOs.
787 struct CheckHelloValidatedContext
791 * This is a doubly-linked list.
793 struct CheckHelloValidatedContext *next;
796 * This is a doubly-linked list.
798 struct CheckHelloValidatedContext *prev;
801 * Hello that we are validating.
803 const struct GNUNET_HELLO_Message *hello;
806 * Context for peerinfo iteration.
807 * NULL after we are done processing peerinfo's information.
809 struct GNUNET_PEERINFO_IteratorContext *piter;
812 * Was a HELLO known for this peer to peerinfo?
817 * Number of validation entries currently referring to this
820 unsigned int ve_count;
828 static struct GNUNET_HELLO_Message *our_hello;
833 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
838 static struct GNUNET_PeerIdentity my_identity;
843 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
848 const struct GNUNET_CONFIGURATION_Handle *cfg;
851 * Linked list of all clients to this service.
853 static struct TransportClient *clients;
856 * All loaded plugins.
858 static struct TransportPlugin *plugins;
861 * Handle to peerinfo service.
863 static struct GNUNET_PEERINFO_Handle *peerinfo;
866 * All known neighbours and their HELLOs.
868 static struct NeighbourList *neighbours;
871 * Number of neighbours we'd like to have.
873 static uint32_t max_connect_per_transport;
876 * Head of linked list.
878 static struct CheckHelloValidatedContext *chvc_head;
881 * Tail of linked list.
883 static struct CheckHelloValidatedContext *chvc_tail;
886 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
887 * of the given peer that we are currently validating).
889 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
892 * Handle for reporting statistics.
894 static struct GNUNET_STATISTICS_Handle *stats;
897 * The peer specified by the given neighbour has timed-out or a plugin
898 * has disconnected. We may either need to do nothing (other plugins
899 * still up), or trigger a full disconnect and clean up. This
900 * function updates our state and do the necessary notifications.
901 * Also notifies our clients that the neighbour is now officially
904 * @param n the neighbour list entry for the peer
905 * @param check should we just check if all plugins
906 * disconnected or must we ask all plugins to
909 static void disconnect_neighbour (struct NeighbourList *n, int check);
912 * Check the ready list for the given neighbour and if a plugin is
913 * ready for transmission (and if we have a message), do so!
915 * @param neighbour target peer for which to transmit
917 static void try_transmission_to_peer (struct NeighbourList *neighbour);
921 * Find an entry in the neighbour list for a particular peer.
923 * @return NULL if not found.
925 static struct NeighbourList *
926 find_neighbour (const struct GNUNET_PeerIdentity *key)
928 struct NeighbourList *head = neighbours;
930 while ((head != NULL) &&
931 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
938 * Find an entry in the transport list for a particular transport.
940 * @return NULL if not found.
942 static struct TransportPlugin *
943 find_transport (const char *short_name)
945 struct TransportPlugin *head = plugins;
946 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
952 * Is a particular peer blacklisted for a particular transport?
954 * @param peer the peer to check for
955 * @param plugin the plugin used to connect to the peer
957 * @return GNUNET_YES if the peer is blacklisted, GNUNET_NO if not
960 is_blacklisted (const struct GNUNET_PeerIdentity *peer, struct TransportPlugin *plugin)
963 if (plugin->blacklist != NULL)
965 if (GNUNET_CONTAINER_multihashmap_contains(plugin->blacklist, &peer->hashPubKey) == GNUNET_YES)
968 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
969 _("Peer `%s:%s' is blacklisted!\n"),
970 plugin->short_name, GNUNET_i2s (peer));
981 add_peer_to_blacklist (struct GNUNET_PeerIdentity *peer, char *transport_name)
983 struct TransportPlugin *plugin;
985 plugin = find_transport(transport_name);
986 if (plugin == NULL) /* Nothing to do */
988 if (plugin->blacklist == NULL)
989 plugin->blacklist = GNUNET_CONTAINER_multihashmap_create(TRANSPORT_BLACKLIST_HT_SIZE);
990 GNUNET_assert(plugin->blacklist != NULL);
991 GNUNET_CONTAINER_multihashmap_put(plugin->blacklist, &peer->hashPubKey,
993 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
998 * Read the blacklist file, containing transport:peer entries.
999 * Provided the transport is loaded, set up hashmap with these
1000 * entries to blacklist peers by transport.
1004 read_blacklist_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
1011 struct GNUNET_PeerIdentity pid;
1013 struct GNUNET_CRYPTO_HashAsciiEncoded enc;
1014 unsigned int entries_found;
1015 char *transport_name;
1018 GNUNET_CONFIGURATION_get_value_filename (cfg,
1024 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1025 _("Option `%s' in section `%s' not specified!\n"),
1031 if (GNUNET_OK != GNUNET_DISK_file_test (fn))
1032 GNUNET_DISK_fn_write (fn, NULL, 0, GNUNET_DISK_PERM_USER_READ
1033 | GNUNET_DISK_PERM_USER_WRITE);
1034 if (0 != STAT (fn, &frstat))
1036 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1037 _("Could not read blacklist file `%s'\n"), fn);
1041 if (frstat.st_size == 0)
1044 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1045 _("Blacklist file `%s' is empty.\n"),
1051 /* FIXME: use mmap */
1052 data = GNUNET_malloc_large (frstat.st_size);
1053 GNUNET_assert(data != NULL);
1054 if (frstat.st_size !=
1055 GNUNET_DISK_fn_read (fn, data, frstat.st_size))
1057 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1058 _("Failed to read blacklist from `%s'\n"), fn);
1065 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1067 while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
1068 (pos <= frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
1071 while ((colon_pos < frstat.st_size) && (data[colon_pos] != ':') && !isspace ( (unsigned char) data[colon_pos]))
1074 if (colon_pos >= frstat.st_size)
1076 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1077 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1078 (unsigned long long) colon_pos);
1084 if (isspace( (unsigned char) data[colon_pos]))
1086 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1087 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1088 (unsigned long long) colon_pos);
1090 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1094 tsize = colon_pos - pos;
1095 if ((pos >= frstat.st_size) || (pos + tsize >= frstat.st_size) || (tsize == 0))
1097 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1098 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1099 (unsigned long long) colon_pos);
1108 transport_name = GNUNET_malloc(tsize + 1);
1109 memcpy(transport_name, &data[pos], tsize);
1110 pos = colon_pos + 1;
1112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1113 _("Read transport name %s in blacklist file.\n"),
1116 memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
1117 if (!isspace ( (unsigned char) enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
1119 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1120 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1121 (unsigned long long) pos);
1123 while ((pos < frstat.st_size) && (!isspace ( (unsigned char) data[pos])))
1125 GNUNET_free_non_null(transport_name);
1128 enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
1129 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
1131 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1132 _("Syntax error in blacklist file at offset %llu, skipping bytes `%s'.\n"),
1133 (unsigned long long) pos,
1138 if (0 != memcmp (&pid,
1140 sizeof (struct GNUNET_PeerIdentity)))
1143 add_peer_to_blacklist (&pid,
1148 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1149 _("Found myself `%s' in blacklist (useless, ignored)\n"),
1153 pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
1154 GNUNET_free_non_null(transport_name);
1155 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1164 * Function called to notify a client about the socket being ready to
1165 * queue more data. "buf" will be NULL and "size" zero if the socket
1166 * was closed for writing in the meantime.
1168 * @param cls closure
1169 * @param size number of bytes available in buf
1170 * @param buf where the callee should write the message
1171 * @return number of bytes written to buf
1174 transmit_to_client_callback (void *cls, size_t size, void *buf)
1176 struct TransportClient *client = cls;
1177 struct ClientMessageQueueEntry *q;
1180 const struct GNUNET_MessageHeader *msg;
1186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1187 "Transmission to client failed, closing connection.\n");
1188 /* fatal error with client, free message queue! */
1189 while (NULL != (q = client->message_queue_head))
1191 GNUNET_STATISTICS_update (stats,
1192 gettext_noop ("# bytes discarded (could not transmit to client)"),
1193 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
1195 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1196 client->message_queue_tail,
1200 client->message_count = 0;
1205 while (NULL != (q = client->message_queue_head))
1207 msg = (const struct GNUNET_MessageHeader *) &q[1];
1208 msize = ntohs (msg->size);
1209 if (msize + tsize > size)
1212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1213 "Transmitting message of type %u to client.\n",
1216 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1217 client->message_queue_tail,
1219 memcpy (&cbuf[tsize], msg, msize);
1222 client->message_count--;
1226 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1227 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1229 GNUNET_TIME_UNIT_FOREVER_REL,
1230 &transmit_to_client_callback,
1232 GNUNET_assert (client->th != NULL);
1239 * Convert an address to a string.
1241 * @param plugin name of the plugin responsible for the address
1242 * @param addr binary address
1243 * @param addr_len number of bytes in addr
1244 * @return NULL on error, otherwise address string
1247 a2s (const char *plugin,
1251 struct TransportPlugin *p;
1255 p = find_transport (plugin);
1258 return p->api->address_to_string (p->api->cls,
1265 * Mark the given FAL entry as 'connected' (and hence preferred for
1266 * sending); also mark all others for the same peer as 'not connected'
1267 * (since only one can be preferred).
1269 * @param fal address to set to 'connected'
1272 mark_address_connected (struct ForeignAddressList *fal)
1274 struct ForeignAddressList *pos;
1277 GNUNET_assert (GNUNET_YES == fal->validated);
1278 if (fal->connected == GNUNET_YES)
1279 return; /* nothing to do */
1281 pos = fal->ready_list->addresses;
1284 if (GNUNET_YES == pos->connected)
1287 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1288 "Marking address `%s' as no longer connected (due to connect on other address)\n",
1289 a2s (pos->ready_list->plugin->short_name,
1293 GNUNET_break (cnt == GNUNET_YES);
1295 pos->connected = GNUNET_NO;
1296 GNUNET_STATISTICS_update (stats,
1297 gettext_noop ("# connected addresses"),
1303 fal->connected = GNUNET_YES;
1304 if (GNUNET_YES == cnt)
1306 GNUNET_STATISTICS_update (stats,
1307 gettext_noop ("# connected addresses"),
1315 * Send the specified message to the specified client. Since multiple
1316 * messages may be pending for the same client at a time, this code
1317 * makes sure that no message is lost.
1319 * @param client client to transmit the message to
1320 * @param msg the message to send
1321 * @param may_drop can this message be dropped if the
1322 * message queue for this client is getting far too large?
1325 transmit_to_client (struct TransportClient *client,
1326 const struct GNUNET_MessageHeader *msg, int may_drop)
1328 struct ClientMessageQueueEntry *q;
1331 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
1333 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1335 ("Dropping message of type %u and size %u, have %u messages pending (%u is the soft limit)\n"),
1338 client->message_count,
1340 GNUNET_STATISTICS_update (stats,
1341 gettext_noop ("# messages dropped due to slow client"),
1346 msize = ntohs (msg->size);
1347 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1348 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1349 memcpy (&q[1], msg, msize);
1350 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1351 client->message_queue_tail,
1352 client->message_queue_tail,
1354 client->message_count++;
1355 if (client->th == NULL)
1357 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1359 GNUNET_TIME_UNIT_FOREVER_REL,
1360 &transmit_to_client_callback,
1362 GNUNET_assert (client->th != NULL);
1368 * Transmit a 'SEND_OK' notification to the given client for the
1371 * @param client who to notify
1372 * @param n neighbour to notify about
1373 * @param result status code for the transmission request
1376 transmit_send_ok (struct TransportClient *client,
1377 struct NeighbourList *n,
1380 struct SendOkMessage send_ok_msg;
1382 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1383 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1384 send_ok_msg.success = htonl (result);
1385 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1386 send_ok_msg.peer = n->id;
1387 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1392 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1393 * upon "completion" of a send request. This tells the API
1394 * that it is now legal to send another message to the given
1397 * @param cls closure, identifies the entry on the
1398 * message queue that was transmitted and the
1399 * client responsible for queueing the message
1400 * @param target the peer receiving the message
1401 * @param result GNUNET_OK on success, if the transmission
1402 * failed, we should not tell the client to transmit
1406 transmit_send_continuation (void *cls,
1407 const struct GNUNET_PeerIdentity *target,
1410 struct MessageQueue *mq = cls;
1411 struct NeighbourList *n;
1413 GNUNET_STATISTICS_update (stats,
1414 gettext_noop ("# bytes pending with plugins"),
1415 - (int64_t) mq->message_buf_size,
1417 if (result == GNUNET_OK)
1419 GNUNET_STATISTICS_update (stats,
1420 gettext_noop ("# bytes successfully transmitted by plugins"),
1421 mq->message_buf_size,
1426 GNUNET_STATISTICS_update (stats,
1427 gettext_noop ("# bytes with transmission failure by plugins"),
1428 mq->message_buf_size,
1431 n = find_neighbour(&mq->neighbour_id);
1432 GNUNET_assert (n != NULL);
1433 if (mq->specific_address != NULL)
1435 if (result == GNUNET_OK)
1437 mq->specific_address->timeout =
1438 GNUNET_TIME_relative_to_absolute
1439 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1440 if (mq->specific_address->validated == GNUNET_YES)
1441 mark_address_connected (mq->specific_address);
1445 if (mq->specific_address->connected != GNUNET_NO)
1448 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1449 "Marking address `%s' as no longer connected (due to transmission problem)\n",
1450 a2s (mq->specific_address->ready_list->plugin->short_name,
1451 mq->specific_address->addr,
1452 mq->specific_address->addrlen));
1454 GNUNET_STATISTICS_update (stats,
1455 gettext_noop ("# connected addresses"),
1458 mq->specific_address->connected = GNUNET_NO;
1461 if (! mq->internal_msg)
1462 mq->specific_address->in_transmit = GNUNET_NO;
1464 if (mq->client != NULL)
1465 transmit_send_ok (mq->client, n, result);
1467 try_transmission_to_peer (n);
1472 * Find an address in any of the available transports for
1473 * the given neighbour that would be good for message
1474 * transmission. This is essentially the transport selection
1477 * @param neighbour for whom to select an address
1478 * @return selected address, NULL if we have none
1480 struct ForeignAddressList *
1481 find_ready_address(struct NeighbourList *neighbour)
1483 struct ReadyList *head = neighbour->plugins;
1484 struct ForeignAddressList *addresses;
1485 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1486 struct ForeignAddressList *best_address;
1488 best_address = NULL;
1489 while (head != NULL)
1491 addresses = head->addresses;
1492 while (addresses != NULL)
1494 if ( (addresses->timeout.abs_value < now.abs_value) &&
1495 (addresses->connected == GNUNET_YES) )
1498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1499 "Marking long-time inactive connection to `%4s' as down.\n",
1500 GNUNET_i2s (&neighbour->id));
1502 GNUNET_STATISTICS_update (stats,
1503 gettext_noop ("# connected addresses"),
1506 addresses->connected = GNUNET_NO;
1508 addresses = addresses->next;
1511 addresses = head->addresses;
1512 while (addresses != NULL)
1514 #if DEBUG_TRANSPORT > 1
1515 if (addresses->addr != NULL)
1516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1517 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1518 a2s (head->plugin->short_name,
1520 addresses->addrlen),
1521 GNUNET_i2s (&neighbour->id),
1522 addresses->connected,
1523 addresses->in_transmit,
1524 addresses->validated,
1525 addresses->connect_attempts,
1526 (unsigned long long) addresses->timeout.abs_value,
1527 (unsigned int) addresses->distance);
1529 if ( ( (best_address == NULL) ||
1530 (addresses->connected == GNUNET_YES) ||
1531 (best_address->connected == GNUNET_NO) ) &&
1532 (addresses->in_transmit == GNUNET_NO) &&
1533 ( (best_address == NULL) ||
1534 (addresses->latency.rel_value < best_address->latency.rel_value)) )
1535 best_address = addresses;
1536 /* FIXME: also give lower-latency addresses that are not
1537 connected a chance some times... */
1538 addresses = addresses->next;
1542 if (best_address != NULL)
1545 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1546 "Best address found (`%s') has latency of %llu ms.\n",
1547 (best_address->addrlen > 0)
1548 ? a2s (best_address->ready_list->plugin->short_name,
1550 best_address->addrlen)
1552 best_address->latency.rel_value);
1557 GNUNET_STATISTICS_update (stats,
1558 gettext_noop ("# transmission attempts failed (no address)"),
1562 return best_address;
1568 * We should re-try transmitting to the given peer,
1569 * hopefully we've learned something in the meantime.
1572 retry_transmission_task (void *cls,
1573 const struct GNUNET_SCHEDULER_TaskContext *tc)
1575 struct NeighbourList *n = cls;
1577 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1578 try_transmission_to_peer (n);
1583 * Check the ready list for the given neighbour and if a plugin is
1584 * ready for transmission (and if we have a message), do so!
1586 * @param neighbour target peer for which to transmit
1589 try_transmission_to_peer (struct NeighbourList *neighbour)
1591 struct ReadyList *rl;
1592 struct MessageQueue *mq;
1593 struct GNUNET_TIME_Relative timeout;
1597 if (neighbour->messages_head == NULL)
1600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1601 "Transmission queue for `%4s' is empty\n",
1602 GNUNET_i2s (&neighbour->id));
1604 return; /* nothing to do */
1607 mq = neighbour->messages_head;
1608 force_address = GNUNET_YES;
1609 if (mq->specific_address == NULL)
1611 mq->specific_address = find_ready_address(neighbour);
1612 GNUNET_STATISTICS_update (stats,
1613 gettext_noop ("# transport selected peer address freely"),
1616 force_address = GNUNET_NO;
1618 if (mq->specific_address == NULL)
1620 GNUNET_STATISTICS_update (stats,
1621 gettext_noop ("# transport failed to selected peer address"),
1624 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1625 if (timeout.rel_value == 0)
1628 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1629 "No destination address available to transmit message of size %u to peer `%4s'\n",
1630 mq->message_buf_size,
1631 GNUNET_i2s (&mq->neighbour_id));
1633 GNUNET_STATISTICS_update (stats,
1634 gettext_noop ("# bytes in message queue for other peers"),
1635 - (int64_t) mq->message_buf_size,
1637 GNUNET_STATISTICS_update (stats,
1638 gettext_noop ("# bytes discarded (no destination address available)"),
1639 mq->message_buf_size,
1641 if (mq->client != NULL)
1642 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1643 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1644 neighbour->messages_tail,
1647 return; /* nobody ready */
1649 GNUNET_STATISTICS_update (stats,
1650 gettext_noop ("# message delivery deferred (no address)"),
1653 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1654 GNUNET_SCHEDULER_cancel (neighbour->retry_task);
1655 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (timeout,
1656 &retry_transmission_task,
1659 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1660 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1661 mq->message_buf_size,
1662 GNUNET_i2s (&mq->neighbour_id),
1665 /* FIXME: might want to trigger peerinfo lookup here
1666 (unless that's already pending...) */
1669 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1670 neighbour->messages_tail,
1672 if (mq->specific_address->connected == GNUNET_NO)
1673 mq->specific_address->connect_attempts++;
1674 rl = mq->specific_address->ready_list;
1675 mq->plugin = rl->plugin;
1676 if (!mq->internal_msg)
1677 mq->specific_address->in_transmit = GNUNET_YES;
1679 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1680 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1681 mq->message_buf_size,
1682 GNUNET_i2s (&neighbour->id),
1683 (mq->specific_address->addr != NULL)
1684 ? a2s (mq->plugin->short_name,
1685 mq->specific_address->addr,
1686 mq->specific_address->addrlen)
1688 rl->plugin->short_name);
1690 GNUNET_STATISTICS_update (stats,
1691 gettext_noop ("# bytes in message queue for other peers"),
1692 - (int64_t) mq->message_buf_size,
1694 GNUNET_STATISTICS_update (stats,
1695 gettext_noop ("# bytes pending with plugins"),
1696 mq->message_buf_size,
1698 ret = rl->plugin->api->send (rl->plugin->api->cls,
1701 mq->message_buf_size,
1703 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1704 mq->specific_address->session,
1705 mq->specific_address->addr,
1706 mq->specific_address->addrlen,
1708 &transmit_send_continuation, mq);
1711 /* failure, but 'send' would not call continuation in this case,
1712 so we need to do it here! */
1713 transmit_send_continuation (mq,
1721 * Send the specified message to the specified peer.
1723 * @param client source of the transmission request (can be NULL)
1724 * @param peer_address ForeignAddressList where we should send this message
1725 * @param priority how important is the message
1726 * @param timeout how long do we have to transmit?
1727 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1728 * @param message_buf_size total size of all messages in message_buf
1729 * @param is_internal is this an internal message; these are pre-pended and
1730 * also do not count for plugins being "ready" to transmit
1731 * @param neighbour handle to the neighbour for transmission
1734 transmit_to_peer (struct TransportClient *client,
1735 struct ForeignAddressList *peer_address,
1736 unsigned int priority,
1737 struct GNUNET_TIME_Relative timeout,
1738 const char *message_buf,
1739 size_t message_buf_size,
1740 int is_internal, struct NeighbourList *neighbour)
1742 struct MessageQueue *mq;
1747 /* check for duplicate submission */
1748 mq = neighbour->messages_head;
1751 if (mq->client == client)
1753 /* client transmitted to same peer twice
1754 before getting SEND_OK! */
1762 GNUNET_STATISTICS_update (stats,
1763 gettext_noop ("# bytes in message queue for other peers"),
1766 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1767 mq->specific_address = peer_address;
1768 mq->client = client;
1769 /* FIXME: this memcpy can be up to 7% of our total runtime! */
1770 memcpy (&mq[1], message_buf, message_buf_size);
1771 mq->message_buf = (const char*) &mq[1];
1772 mq->message_buf_size = message_buf_size;
1773 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1774 mq->internal_msg = is_internal;
1775 mq->priority = priority;
1776 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1778 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1779 neighbour->messages_tail,
1782 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1783 neighbour->messages_tail,
1784 neighbour->messages_tail,
1786 try_transmission_to_peer (neighbour);
1793 struct GeneratorContext
1795 struct TransportPlugin *plug_pos;
1796 struct OwnAddressList *addr_pos;
1797 struct GNUNET_TIME_Absolute expiration;
1805 address_generator (void *cls, size_t max, void *buf)
1807 struct GeneratorContext *gc = cls;
1810 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1812 gc->plug_pos = gc->plug_pos->next;
1813 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1815 if (NULL == gc->plug_pos)
1820 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1823 gc->addr_pos->addrlen, buf, max);
1824 gc->addr_pos = gc->addr_pos->next;
1830 * Construct our HELLO message from all of the addresses of
1831 * all of the transports.
1836 struct GNUNET_HELLO_Message *hello;
1837 struct TransportClient *cpos;
1838 struct NeighbourList *npos;
1839 struct GeneratorContext gc;
1841 gc.plug_pos = plugins;
1842 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1843 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1844 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1847 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1849 GNUNET_STATISTICS_update (stats,
1850 gettext_noop ("# refreshed my HELLO"),
1854 while (cpos != NULL)
1856 transmit_to_client (cpos,
1857 (const struct GNUNET_MessageHeader *) hello,
1862 GNUNET_free_non_null (our_hello);
1864 GNUNET_PEERINFO_add_peer (peerinfo, our_hello);
1866 while (npos != NULL)
1869 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1870 "Transmitting updated `%s' to neighbour `%4s'\n",
1871 "HELLO", GNUNET_i2s (&npos->id));
1873 GNUNET_STATISTICS_update (stats,
1874 gettext_noop ("# transmitted my HELLO to other peers"),
1877 transmit_to_peer (NULL, NULL, 0,
1878 HELLO_ADDRESS_EXPIRATION,
1879 (const char *) our_hello,
1880 GNUNET_HELLO_size(our_hello),
1888 * Task used to clean up expired addresses for a plugin.
1890 * @param cls closure
1894 expire_address_task (void *cls,
1895 const struct GNUNET_SCHEDULER_TaskContext *tc);
1899 * Update the list of addresses for this plugin,
1900 * expiring those that are past their expiration date.
1902 * @param plugin addresses of which plugin should be recomputed?
1903 * @param fresh set to GNUNET_YES if a new address was added
1904 * and we need to regenerate the HELLO even if nobody
1908 update_addresses (struct TransportPlugin *plugin,
1911 static struct GNUNET_TIME_Absolute last_update;
1912 struct GNUNET_TIME_Relative min_remaining;
1913 struct GNUNET_TIME_Relative remaining;
1914 struct GNUNET_TIME_Absolute now;
1915 struct OwnAddressList *pos;
1916 struct OwnAddressList *prev;
1917 struct OwnAddressList *next;
1920 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1921 GNUNET_SCHEDULER_cancel (plugin->address_update_task);
1922 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1923 now = GNUNET_TIME_absolute_get ();
1924 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1925 expired = (GNUNET_TIME_absolute_get_duration (last_update).rel_value > (HELLO_ADDRESS_EXPIRATION.rel_value / 4));
1927 pos = plugin->addresses;
1931 if (pos->expires.abs_value < now.abs_value)
1933 expired = GNUNET_YES;
1935 plugin->addresses = pos->next;
1937 prev->next = pos->next;
1942 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1943 if (remaining.rel_value < min_remaining.rel_value)
1944 min_remaining = remaining;
1950 if (expired || fresh)
1955 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1956 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1958 plugin->address_update_task
1959 = GNUNET_SCHEDULER_add_delayed (min_remaining,
1960 &expire_address_task, plugin);
1965 * Task used to clean up expired addresses for a plugin.
1967 * @param cls closure
1971 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1973 struct TransportPlugin *plugin = cls;
1975 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1976 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1977 update_addresses (plugin, GNUNET_NO);
1982 * Iterator over hash map entries that NULLs the session of validation
1983 * entries that match the given session.
1985 * @param cls closure (the 'struct Session*' to match against)
1986 * @param key current key code (peer ID, not used)
1987 * @param value value in the hash map ('struct ValidationEntry*')
1988 * @return GNUNET_YES (we should continue to iterate)
1991 remove_session_validations (void *cls,
1992 const GNUNET_HashCode * key,
1995 struct Session *session = cls;
1996 struct ValidationEntry *ve = value;
1998 if (session == ve->session)
2005 * We've been disconnected from the other peer (for some
2006 * connection-oriented transport). Either quickly
2007 * re-establish the connection or signal the disconnect
2010 * Only signal CORE level disconnect if ALL addresses
2011 * for the peer are exhausted.
2013 * @param p overall plugin context
2014 * @param nl neighbour that was disconnected
2017 try_fast_reconnect (struct TransportPlugin *p,
2018 struct NeighbourList *nl)
2020 /* FIXME-MW: fast reconnect / transport switching not implemented... */
2021 /* Note: the idea here is to hide problems with transports (or
2022 switching between plugins) from the core to eliminate the need to
2023 re-negotiate session keys and the like; OTOH, we should tell core
2024 quickly (much faster than timeout) `if a connection was lost and
2025 could not be re-established (i.e. other peer went down or is
2026 unable / refuses to communicate);
2028 So we should consider:
2029 1) ideally: our own willingness / need to connect
2030 2) prior failures to connect to this peer (by plugin)
2031 3) ideally: reasons why other peer terminated (as far as knowable)
2033 Most importantly, it must be POSSIBLE for another peer to terminate
2034 a connection for a while (without us instantly re-establishing it).
2035 Similarly, if another peer is gone we should quickly notify CORE.
2036 OTOH, if there was a minor glitch (i.e. crash of gnunet-service-transport
2037 on the other end), we should reconnect in such a way that BOTH CORE
2038 services never even notice.
2039 Furthermore, the same mechanism (or small variation) could be used
2040 to switch to a better-performing plugin (ATS).
2042 Finally, this needs to be tested throughly... */
2045 * GNUNET_NO in the call below makes transport disconnect the peer,
2046 * even if only a single address (out of say, six) went away. This
2047 * function must be careful to ONLY disconnect if the peer is gone,
2048 * not just a specifi address.
2050 * More specifically, half the places it was used had it WRONG.
2053 /* No reconnect, signal disconnect instead! */
2054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2055 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&nl->id),
2056 "try_fast_reconnect");
2057 disconnect_neighbour (nl, GNUNET_YES);
2062 * Function that will be called whenever the plugin internally
2063 * cleans up a session pointer and hence the service needs to
2064 * discard all of those sessions as well. Plugins that do not
2065 * use sessions can simply omit calling this function and always
2066 * use NULL wherever a session pointer is needed.
2068 * @param cls closure
2069 * @param peer which peer was the session for
2070 * @param session which session is being destoyed
2073 plugin_env_session_end (void *cls,
2074 const struct GNUNET_PeerIdentity *peer,
2075 struct Session *session)
2077 struct TransportPlugin *p = cls;
2078 struct NeighbourList *nl;
2079 struct ReadyList *rl;
2080 struct ForeignAddressList *pos;
2081 struct ForeignAddressList *prev;
2083 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2084 &remove_session_validations,
2086 nl = find_neighbour (peer);
2088 return; /* was never marked as connected */
2092 if (rl->plugin == p)
2097 return; /* was never marked as connected */
2099 pos = rl->addresses;
2100 while ( (pos != NULL) &&
2101 (pos->session != session) )
2107 return; /* was never marked as connected */
2108 pos->session = NULL;
2109 if (pos->addrlen != 0)
2111 if (nl->received_pong != GNUNET_NO)
2112 try_fast_reconnect (p, nl);
2115 /* was inbound connection, free 'pos' */
2117 rl->addresses = pos->next;
2119 prev->next = pos->next;
2120 if (GNUNET_SCHEDULER_NO_TASK != pos->revalidate_task)
2122 GNUNET_SCHEDULER_cancel (pos->revalidate_task);
2123 pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2126 if (nl->received_pong == GNUNET_NO)
2127 return; /* nothing to do, never connected... */
2128 /* check if we have any validated addresses left */
2129 pos = rl->addresses;
2134 try_fast_reconnect (p, nl);
2139 /* no valid addresses left, signal disconnect! */
2141 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2142 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&nl->id),
2143 "plugin_env_session_end");
2144 /* FIXME: This doesn't mean there are no addresses left for this PEER,
2145 * it means there aren't any left for this PLUGIN/PEER combination! So
2146 * calling disconnect_neighbor here with GNUNET_NO forces disconnect
2147 * when it isn't necessary. Using GNUNET_YES at least checks to see
2148 * if there are any addresses that work first, so as not to overdo it.
2151 disconnect_neighbour (nl, GNUNET_YES);
2156 * Function that must be called by each plugin to notify the
2157 * transport service about the addresses under which the transport
2158 * provided by the plugin can be reached.
2160 * @param cls closure
2161 * @param name name of the transport that generated the address
2162 * @param addr one of the addresses of the host, NULL for the last address
2163 * the specific address format depends on the transport
2164 * @param addrlen length of the address
2165 * @param expires when should this address automatically expire?
2168 plugin_env_notify_address (void *cls,
2172 struct GNUNET_TIME_Relative expires)
2174 struct TransportPlugin *p = cls;
2175 struct OwnAddressList *al;
2176 struct GNUNET_TIME_Absolute abex;
2178 GNUNET_assert (addr != NULL);
2179 abex = GNUNET_TIME_relative_to_absolute (expires);
2180 GNUNET_assert (p == find_transport (name));
2184 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
2187 update_addresses (p, GNUNET_NO);
2193 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
2194 al->next = p->addresses;
2197 al->addrlen = addrlen;
2198 memcpy (&al[1], addr, addrlen);
2199 update_addresses (p, GNUNET_YES);
2204 * Notify all of our clients about a peer connecting.
2207 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
2208 struct GNUNET_TIME_Relative latency,
2211 struct ConnectInfoMessage cim;
2212 struct TransportClient *cpos;
2215 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2216 "Notifying clients about connection from `%s'\n",
2219 GNUNET_STATISTICS_update (stats,
2220 gettext_noop ("# peers connected"),
2223 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2224 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2225 cim.distance = htonl (distance);
2226 cim.latency = GNUNET_TIME_relative_hton (latency);
2227 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
2229 while (cpos != NULL)
2231 transmit_to_client (cpos, &cim.header, GNUNET_NO);
2238 * Notify all of our clients about a peer disconnecting.
2241 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2243 struct DisconnectInfoMessage dim;
2244 struct TransportClient *cpos;
2247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2248 "Notifying clients about lost connection to `%s'\n",
2251 GNUNET_STATISTICS_update (stats,
2252 gettext_noop ("# peers connected"),
2255 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2256 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2257 dim.reserved = htonl (0);
2258 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2260 while (cpos != NULL)
2262 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2269 * Find a ForeignAddressList entry for the given neighbour
2270 * that matches the given address and transport.
2272 * @param neighbour which peer we care about
2273 * @param tname name of the transport plugin
2274 * @param session session to look for, NULL for 'any'; otherwise
2275 * can be used for the service to "learn" this session ID
2277 * @param addr binary address
2278 * @param addrlen length of addr
2279 * @return NULL if no such entry exists
2281 static struct ForeignAddressList *
2282 find_peer_address(struct NeighbourList *neighbour,
2284 struct Session *session,
2288 struct ReadyList *head;
2289 struct ForeignAddressList *pos;
2291 head = neighbour->plugins;
2292 while (head != NULL)
2294 if (0 == strcmp (tname, head->plugin->short_name))
2300 pos = head->addresses;
2301 while ( (pos != NULL) &&
2302 ( (pos->addrlen != addrlen) ||
2303 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2305 if ( (session != NULL) &&
2306 (pos->session == session) )
2310 if ( (session != NULL) && (pos != NULL) )
2311 pos->session = session; /* learn it! */
2317 * Get the peer address struct for the given neighbour and
2318 * address. If it doesn't yet exist, create it.
2320 * @param neighbour which peer we care about
2321 * @param tname name of the transport plugin
2322 * @param session session of the plugin, or NULL for none
2323 * @param addr binary address
2324 * @param addrlen length of addr
2325 * @return NULL if we do not have a transport plugin for 'tname'
2327 static struct ForeignAddressList *
2328 add_peer_address (struct NeighbourList *neighbour,
2330 struct Session *session,
2334 struct ReadyList *head;
2335 struct ForeignAddressList *ret;
2337 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2340 head = neighbour->plugins;
2342 while (head != NULL)
2344 if (0 == strcmp (tname, head->plugin->short_name))
2350 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2351 ret->session = session;
2354 ret->addr = (const char*) &ret[1];
2355 memcpy (&ret[1], addr, addrlen);
2361 ret->addrlen = addrlen;
2362 ret->expires = GNUNET_TIME_relative_to_absolute
2363 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2364 ret->latency = GNUNET_TIME_relative_get_forever();
2366 ret->timeout = GNUNET_TIME_relative_to_absolute
2367 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2368 ret->ready_list = head;
2369 ret->next = head->addresses;
2370 head->addresses = ret;
2376 * Closure for 'add_validated_address'.
2378 struct AddValidatedAddressContext
2381 * Entry that has been validated.
2383 const struct ValidationEntry *ve;
2386 * Flag set after we have added the address so
2387 * that we terminate the iteration next time.
2394 * Callback function used to fill a buffer of max bytes with a list of
2395 * addresses in the format used by HELLOs. Should use
2396 * "GNUNET_HELLO_add_address" as a helper function.
2398 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2399 * @param max maximum number of bytes that can be written to buf
2400 * @param buf where to write the address information
2401 * @return number of bytes written, 0 to signal the
2402 * end of the iteration.
2405 add_validated_address (void *cls,
2406 size_t max, void *buf)
2408 struct AddValidatedAddressContext *avac = cls;
2409 const struct ValidationEntry *ve = avac->ve;
2411 if (GNUNET_YES == avac->done)
2413 avac->done = GNUNET_YES;
2414 return GNUNET_HELLO_add_address (ve->transport_name,
2415 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2425 * Closure for 'check_address_exists'.
2427 struct CheckAddressExistsClosure
2430 * Address to check for.
2435 * Name of the transport.
2442 struct Session *session;
2445 * Set to GNUNET_YES if the address exists.
2458 * Iterator over hash map entries. Checks if the given
2459 * validation entry is for the same address as what is given
2462 * @param cls the 'struct CheckAddressExistsClosure*'
2463 * @param key current key code (ignored)
2464 * @param value value in the hash map ('struct ValidationEntry')
2465 * @return GNUNET_YES if we should continue to
2466 * iterate (mismatch), GNUNET_NO if not (entry matched)
2469 check_address_exists (void *cls,
2470 const GNUNET_HashCode * key,
2473 struct CheckAddressExistsClosure *caec = cls;
2474 struct ValidationEntry *ve = value;
2476 if ( (0 == strcmp (caec->tname,
2477 ve->transport_name)) &&
2478 (caec->addrlen == ve->addrlen) &&
2479 (0 == memcmp (caec->addr,
2483 caec->exists = GNUNET_YES;
2486 if ( (ve->session != NULL) &&
2487 (caec->session == ve->session) )
2489 caec->exists = GNUNET_YES;
2498 * Iterator to free entries in the validation_map.
2500 * @param cls closure (unused)
2501 * @param key current key code
2502 * @param value value in the hash map (validation to abort)
2503 * @return GNUNET_YES (always)
2506 abort_validation (void *cls,
2507 const GNUNET_HashCode * key,
2510 struct ValidationEntry *va = value;
2512 if (GNUNET_SCHEDULER_NO_TASK != va->timeout_task)
2513 GNUNET_SCHEDULER_cancel (va->timeout_task);
2514 GNUNET_free (va->transport_name);
2515 if (va->chvc != NULL)
2517 va->chvc->ve_count--;
2518 if (va->chvc->ve_count == 0)
2520 GNUNET_CONTAINER_DLL_remove (chvc_head,
2523 GNUNET_free (va->chvc);
2533 * HELLO validation cleanup task (validation failed).
2535 * @param cls the 'struct ValidationEntry' that failed
2536 * @param tc scheduler context (unused)
2539 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2541 struct ValidationEntry *va = cls;
2542 struct GNUNET_PeerIdentity pid;
2544 va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2545 GNUNET_STATISTICS_update (stats,
2546 gettext_noop ("# address validation timeouts"),
2549 GNUNET_CRYPTO_hash (&va->publicKey,
2551 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2553 GNUNET_break (GNUNET_OK ==
2554 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2557 abort_validation (NULL, NULL, va);
2562 neighbour_timeout_task (void *cls,
2563 const struct GNUNET_SCHEDULER_TaskContext *tc)
2565 struct NeighbourList *n = cls;
2568 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2569 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2571 GNUNET_STATISTICS_update (stats,
2572 gettext_noop ("# disconnects due to timeout"),
2575 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2576 disconnect_neighbour (n, GNUNET_NO);
2581 * Schedule the job that will cause us to send a PING to the
2582 * foreign address to evaluate its validity and latency.
2584 * @param fal address to PING
2587 schedule_next_ping (struct ForeignAddressList *fal);
2591 * Add the given address to the list of foreign addresses
2592 * available for the given peer (check for duplicates).
2594 * @param cls the respective 'struct NeighbourList' to update
2595 * @param tname name of the transport
2596 * @param expiration expiration time
2597 * @param addr the address
2598 * @param addrlen length of the address
2599 * @return GNUNET_OK (always)
2602 add_to_foreign_address_list (void *cls,
2604 struct GNUNET_TIME_Absolute expiration,
2608 struct NeighbourList *n = cls;
2609 struct ForeignAddressList *fal;
2612 GNUNET_STATISTICS_update (stats,
2613 gettext_noop ("# valid peer addresses returned by PEERINFO"),
2617 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2620 #if DEBUG_TRANSPORT_HELLO
2621 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2622 "Adding address `%s' (%s) for peer `%4s' due to PEERINFO data for %llums.\n",
2623 a2s (tname, addr, addrlen),
2625 GNUNET_i2s (&n->id),
2626 expiration.abs_value);
2628 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2631 GNUNET_STATISTICS_update (stats,
2632 gettext_noop ("# previously validated addresses lacking transport"),
2638 fal->expires = GNUNET_TIME_absolute_max (expiration,
2640 schedule_next_ping (fal);
2646 fal->expires = GNUNET_TIME_absolute_max (expiration,
2651 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2652 "Failed to add new address for `%4s'\n",
2653 GNUNET_i2s (&n->id));
2656 if (fal->validated == GNUNET_NO)
2658 fal->validated = GNUNET_YES;
2659 GNUNET_STATISTICS_update (stats,
2660 gettext_noop ("# peer addresses considered valid"),
2664 if (try == GNUNET_YES)
2666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2667 "Have new addresses, will try to trigger transmissions.\n");
2668 try_transmission_to_peer (n);
2675 * Add addresses in validated HELLO "h" to the set of addresses
2676 * we have for this peer.
2678 * @param cls closure ('struct NeighbourList*')
2679 * @param peer id of the peer, NULL for last call
2680 * @param h hello message for the peer (can be NULL)
2683 add_hello_for_peer (void *cls,
2684 const struct GNUNET_PeerIdentity *peer,
2685 const struct GNUNET_HELLO_Message *h)
2687 struct NeighbourList *n = cls;
2691 GNUNET_STATISTICS_update (stats,
2692 gettext_noop ("# outstanding peerinfo iterate requests"),
2699 return; /* no HELLO available */
2701 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2702 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2706 if (GNUNET_YES != n->public_key_valid)
2708 GNUNET_HELLO_get_key (h, &n->publicKey);
2709 n->public_key_valid = GNUNET_YES;
2711 GNUNET_HELLO_iterate_addresses (h,
2713 &add_to_foreign_address_list,
2719 * Create a fresh entry in our neighbour list for the given peer.
2720 * Will try to transmit our current HELLO to the new neighbour.
2721 * Do not call this function directly, use 'setup_peer_check_blacklist.
2723 * @param peer the peer for which we create the entry
2724 * @param do_hello should we schedule transmitting a HELLO
2725 * @return the new neighbour list entry
2727 static struct NeighbourList *
2728 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2731 struct NeighbourList *n;
2732 struct TransportPlugin *tp;
2733 struct ReadyList *rl;
2736 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2737 "Setting up state for neighbour `%4s'\n",
2740 GNUNET_assert (our_hello != NULL);
2741 GNUNET_STATISTICS_update (stats,
2742 gettext_noop ("# active neighbours"),
2745 n = GNUNET_malloc (sizeof (struct NeighbourList));
2746 n->next = neighbours;
2750 GNUNET_TIME_relative_to_absolute
2751 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2752 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2753 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2754 MAX_BANDWIDTH_CARRY_S);
2758 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2760 rl = GNUNET_malloc (sizeof (struct ReadyList));
2762 rl->next = n->plugins;
2765 rl->addresses = NULL;
2769 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2771 n->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2772 &neighbour_timeout_task, n);
2775 GNUNET_STATISTICS_update (stats,
2776 gettext_noop ("# peerinfo new neighbor iterate requests"),
2779 GNUNET_STATISTICS_update (stats,
2780 gettext_noop ("# outstanding peerinfo iterate requests"),
2783 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2784 GNUNET_TIME_UNIT_FOREVER_REL,
2785 &add_hello_for_peer, n);
2787 GNUNET_STATISTICS_update (stats,
2788 gettext_noop ("# HELLO's sent to new neighbors"),
2791 transmit_to_peer (NULL, NULL, 0,
2792 HELLO_ADDRESS_EXPIRATION,
2793 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2801 * Function called after we have checked if communicating
2802 * with a given peer is acceptable.
2804 * @param cls closure
2805 * @param n NULL if communication is not acceptable
2807 typedef void (*SetupContinuation)(void *cls,
2808 struct NeighbourList *n);
2812 * Information kept for each client registered to perform
2818 * This is a linked list.
2820 struct Blacklisters *next;
2823 * This is a linked list.
2825 struct Blacklisters *prev;
2828 * Client responsible for this entry.
2830 struct GNUNET_SERVER_Client *client;
2833 * Blacklist check that we're currently performing.
2835 struct BlacklistCheck *bc;
2841 * Head of DLL of blacklisting clients.
2843 static struct Blacklisters *bl_head;
2846 * Tail of DLL of blacklisting clients.
2848 static struct Blacklisters *bl_tail;
2852 * Context we use when performing a blacklist check.
2854 struct BlacklistCheck
2858 * This is a linked list.
2860 struct BlacklistCheck *next;
2863 * This is a linked list.
2865 struct BlacklistCheck *prev;
2868 * Peer being checked.
2870 struct GNUNET_PeerIdentity peer;
2873 * Option for setup neighbour afterwards.
2878 * Continuation to call with the result.
2880 SetupContinuation cont;
2888 * Current transmission request handle for this client, or NULL if no
2889 * request is pending.
2891 struct GNUNET_CONNECTION_TransmitHandle *th;
2894 * Our current position in the blacklisters list.
2896 struct Blacklisters *bl_pos;
2899 * Current task performing the check.
2901 GNUNET_SCHEDULER_TaskIdentifier task;
2906 * Head of DLL of active blacklisting queries.
2908 static struct BlacklistCheck *bc_head;
2911 * Tail of DLL of active blacklisting queries.
2913 static struct BlacklistCheck *bc_tail;
2917 * Perform next action in the blacklist check.
2919 * @param cls the 'struct BlacklistCheck*'
2923 do_blacklist_check (void *cls,
2924 const struct GNUNET_SCHEDULER_TaskContext *tc);
2928 * Transmit blacklist query to the client.
2930 * @param cls the 'struct BlacklistCheck'
2931 * @param size number of bytes allowed
2932 * @param buf where to copy the message
2933 * @return number of bytes copied to buf
2936 transmit_blacklist_message (void *cls,
2940 struct BlacklistCheck *bc = cls;
2941 struct Blacklisters *bl;
2942 struct BlacklistMessage bm;
2947 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2948 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
2953 bm.header.size = htons (sizeof (struct BlacklistMessage));
2954 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2955 bm.is_allowed = htonl (0);
2957 memcpy (buf, &bm, sizeof (bm));
2958 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2964 * Perform next action in the blacklist check.
2966 * @param cls the 'struct BlacklistCheck*'
2970 do_blacklist_check (void *cls,
2971 const struct GNUNET_SCHEDULER_TaskContext *tc)
2973 struct BlacklistCheck *bc = cls;
2974 struct Blacklisters *bl;
2976 bc->task = GNUNET_SCHEDULER_NO_TASK;
2980 bc->cont (bc->cont_cls,
2981 setup_new_neighbour (&bc->peer, bc->do_hello));
2988 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
2989 sizeof (struct BlacklistMessage),
2990 GNUNET_TIME_UNIT_FOREVER_REL,
2991 &transmit_blacklist_message,
2998 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
2999 * does not yet exist, check the blacklist. If the blacklist says creating
3000 * one is acceptable, create one and call the continuation; otherwise
3001 * call the continuation with NULL.
3003 * @param peer peer to setup or look up a struct NeighbourList for
3004 * @param do_hello should we also schedule sending our HELLO to the peer
3005 * if this is a new record
3006 * @param cont function to call with the 'struct NeigbhbourList*'
3007 * @param cont_cls closure for cont
3010 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
3012 SetupContinuation cont,
3015 struct NeighbourList *n;
3016 struct BlacklistCheck *bc;
3018 n = find_neighbour(peer);
3025 if (bl_head == NULL)
3028 cont (cont_cls, setup_new_neighbour (peer, do_hello));
3030 setup_new_neighbour(peer, do_hello);
3033 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3034 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3036 bc->do_hello = do_hello;
3038 bc->cont_cls = cont_cls;
3039 bc->bl_pos = bl_head;
3040 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3046 * Function called with the result of querying a new blacklister about
3047 * it being allowed (or not) to continue to talk to an existing neighbour.
3049 * @param cls the original 'struct NeighbourList'
3050 * @param n NULL if we need to disconnect
3053 confirm_or_drop_neighbour (void *cls,
3054 struct NeighbourList *n)
3056 struct NeighbourList * orig = cls;
3060 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3061 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&orig->id),
3062 "confirm_or_drop_neighboUr");
3063 disconnect_neighbour (orig, GNUNET_NO);
3069 * Handle a request to start a blacklist.
3071 * @param cls closure (always NULL)
3072 * @param client identification of the client
3073 * @param message the actual message
3076 handle_blacklist_init (void *cls,
3077 struct GNUNET_SERVER_Client *client,
3078 const struct GNUNET_MessageHeader *message)
3080 struct Blacklisters *bl;
3081 struct BlacklistCheck *bc;
3082 struct NeighbourList *n;
3087 if (bl->client == client)
3090 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3095 bl = GNUNET_malloc (sizeof (struct Blacklisters));
3096 bl->client = client;
3097 GNUNET_SERVER_client_keep (client);
3098 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
3099 /* confirm that all existing connections are OK! */
3103 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3104 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3106 bc->do_hello = GNUNET_NO;
3107 bc->cont = &confirm_or_drop_neighbour;
3110 if (n == neighbours) /* all would wait for the same client, no need to
3111 create more than just the first task right now */
3112 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3120 * Handle a request to blacklist a peer.
3122 * @param cls closure (always NULL)
3123 * @param client identification of the client
3124 * @param message the actual message
3127 handle_blacklist_reply (void *cls,
3128 struct GNUNET_SERVER_Client *client,
3129 const struct GNUNET_MessageHeader *message)
3131 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
3132 struct Blacklisters *bl;
3133 struct BlacklistCheck *bc;
3136 while ( (bl != NULL) &&
3137 (bl->client != client) )
3141 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3146 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
3148 bc->cont (bc->cont_cls, NULL);
3149 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
3154 bc->bl_pos = bc->bl_pos->next;
3155 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3158 /* check if any other bc's are waiting for this blacklister */
3162 if ( (bc->bl_pos == bl) &&
3163 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
3164 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3172 * Send periodic PING messages to a given foreign address.
3174 * @param cls our 'struct PeriodicValidationContext*'
3175 * @param tc task context
3178 send_periodic_ping (void *cls,
3179 const struct GNUNET_SCHEDULER_TaskContext *tc)
3181 struct ForeignAddressList *peer_address = cls;
3182 struct TransportPlugin *tp;
3183 struct ValidationEntry *va;
3184 struct NeighbourList *neighbour;
3185 struct TransportPingMessage ping;
3186 struct CheckAddressExistsClosure caec;
3188 uint16_t hello_size;
3192 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3193 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3195 tp = peer_address->ready_list->plugin;
3196 neighbour = peer_address->ready_list->neighbour;
3197 if (GNUNET_YES != neighbour->public_key_valid)
3199 /* no public key yet, try again later */
3200 schedule_next_ping (peer_address);
3203 caec.addr = peer_address->addr;
3204 caec.addrlen = peer_address->addrlen;
3205 caec.tname = tp->short_name;
3206 caec.session = peer_address->session;
3207 caec.exists = GNUNET_NO;
3208 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3209 &check_address_exists,
3211 if (caec.exists == GNUNET_YES)
3213 /* During validation attempts we will likely trigger the other
3214 peer trying to validate our address which in turn will cause
3215 it to send us its HELLO, so we expect to hit this case rather
3216 frequently. Only print something if we are very verbose. */
3217 #if DEBUG_TRANSPORT > 1
3218 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3219 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3220 (peer_address->addr != NULL)
3221 ? a2s (tp->short_name,
3223 peer_address->addrlen)
3226 GNUNET_i2s (&neighbour->id));
3228 schedule_next_ping (peer_address);
3231 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3232 va->transport_name = GNUNET_strdup (tp->short_name);
3233 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
3235 va->send_time = GNUNET_TIME_absolute_get();
3236 va->session = peer_address->session;
3237 if (peer_address->addr != NULL)
3239 va->addr = (const void*) &va[1];
3240 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3241 va->addrlen = peer_address->addrlen;
3243 memcpy(&va->publicKey,
3244 &neighbour->publicKey,
3245 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3247 va->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_VERIFICATION_TIMEOUT,
3248 &timeout_hello_validation,
3250 GNUNET_CONTAINER_multihashmap_put (validation_map,
3251 &neighbour->id.hashPubKey,
3253 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3255 if (peer_address->validated != GNUNET_YES)
3256 hello_size = GNUNET_HELLO_size(our_hello);
3260 tsize = sizeof(struct TransportPingMessage) + hello_size;
3262 if (peer_address->addr != NULL)
3264 slen = strlen (tp->short_name) + 1;
3265 tsize += slen + peer_address->addrlen;
3269 slen = 0; /* make gcc happy */
3271 message_buf = GNUNET_malloc(tsize);
3272 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3273 ping.challenge = htonl(va->challenge);
3274 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3275 if (peer_address->validated != GNUNET_YES)
3277 memcpy(message_buf, our_hello, hello_size);
3280 if (peer_address->addr != NULL)
3282 ping.header.size = htons(sizeof(struct TransportPingMessage) +
3283 peer_address->addrlen +
3285 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3288 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3290 peer_address->addrlen);
3294 ping.header.size = htons(sizeof(struct TransportPingMessage));
3297 memcpy(&message_buf[hello_size],
3299 sizeof(struct TransportPingMessage));
3301 #if DEBUG_TRANSPORT_REVALIDATION
3302 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3303 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s'\n",
3304 (peer_address->addr != NULL)
3305 ? a2s (peer_address->plugin->short_name,
3307 peer_address->addrlen)
3310 GNUNET_i2s (&neighbour->id),
3311 "HELLO", hello_size,
3314 if (peer_address->validated != GNUNET_YES)
3315 GNUNET_STATISTICS_update (stats,
3316 gettext_noop ("# PING with HELLO messages sent"),
3320 GNUNET_STATISTICS_update (stats,
3321 gettext_noop ("# PING without HELLO messages sent"),
3324 GNUNET_STATISTICS_update (stats,
3325 gettext_noop ("# PING messages sent for re-validation"),
3328 transmit_to_peer (NULL, peer_address,
3329 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3330 HELLO_VERIFICATION_TIMEOUT,
3332 GNUNET_YES, neighbour);
3333 GNUNET_free(message_buf);
3334 schedule_next_ping (peer_address);
3339 * Schedule the job that will cause us to send a PING to the
3340 * foreign address to evaluate its validity and latency.
3342 * @param fal address to PING
3345 schedule_next_ping (struct ForeignAddressList *fal)
3347 struct GNUNET_TIME_Relative delay;
3349 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3351 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3352 delay.rel_value /= 2; /* do before expiration */
3353 delay = GNUNET_TIME_relative_min (delay,
3354 LATENCY_EVALUATION_MAX_DELAY);
3355 if (GNUNET_YES != fal->estimated)
3357 delay = GNUNET_TIME_UNIT_ZERO;
3358 fal->estimated = GNUNET_YES;
3360 if (GNUNET_YES == fal->connected)
3362 delay = GNUNET_TIME_relative_min (delay,
3363 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3365 /* FIXME: also adjust delay based on how close the last
3366 observed latency is to the latency of the best alternative */
3367 /* bound how fast we can go */
3368 delay = GNUNET_TIME_relative_max (delay,
3369 GNUNET_TIME_UNIT_SECONDS);
3370 /* randomize a bit (to avoid doing all at the same time) */
3371 delay.rel_value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3372 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(delay,
3373 &send_periodic_ping,
3381 * Function that will be called if we receive some payload
3382 * from another peer.
3384 * @param message the payload
3385 * @param n peer who claimed to be the sender
3386 * @param ats ATS information
3387 * @param ats_count numbers of elements following the ats struct (excluding the 0-terminator)
3390 handle_payload_message (const struct GNUNET_MessageHeader *message,
3391 struct NeighbourList *n, struct GNUNET_TRANSPORT_ATS_Information *ats, uint32_t ats_count)
3393 struct InboundMessage *im;
3394 struct TransportClient *cpos;
3397 msize = ntohs (message->size);
3398 if (n->received_pong == GNUNET_NO)
3400 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3401 "Received message of type %u and size %u from `%4s', but no pong yet!!\n",
3402 ntohs (message->type),
3403 ntohs (message->size),
3404 GNUNET_i2s (&n->id));
3405 GNUNET_free_non_null (n->pre_connect_message_buffer);
3406 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3407 memcpy (n->pre_connect_message_buffer, message, msize);
3412 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3413 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
3414 ntohs (message->type),
3415 ntohs (message->size),
3416 GNUNET_i2s (&n->id));
3418 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3421 n->quota_violation_count++;
3423 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3424 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3425 n->in_tracker.available_bytes_per_s__,
3426 n->quota_violation_count);
3428 /* Discount 32k per violation */
3429 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3434 if (n->quota_violation_count > 0)
3436 /* try to add 32k back */
3437 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3439 n->quota_violation_count--;
3442 GNUNET_STATISTICS_update (stats,
3443 gettext_noop ("# payload received from other peers"),
3447 /* transmit message to all clients */
3448 im = GNUNET_malloc (sizeof (struct InboundMessage) + ats_count * sizeof(struct GNUNET_TRANSPORT_ATS_Information) + msize);
3449 im->header.size = htons (sizeof (struct InboundMessage) + ats_count * sizeof(struct GNUNET_TRANSPORT_ATS_Information) + msize);
3450 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3451 //im->latency = GNUNET_TIME_relative_hton (n->latency);
3452 //im->distance = ntohl(n->distance);
3454 im->ats_count = htonl(ats_count);
3455 /* insert ATS elements */
3456 memcpy (&(im->ats), ats, ats_count * sizeof(struct GNUNET_TRANSPORT_ATS_Information));
3457 /* insert ATS terminator */
3458 (&im->ats)[ats_count].type = htonl(0);
3459 (&im->ats)[ats_count].value = htonl(0);
3460 /* insert msg after terminator */
3461 memcpy (&(&im->ats)[ats_count+1], message, msize);
3464 while (cpos != NULL)
3466 transmit_to_client (cpos, &im->header, GNUNET_YES);
3474 * Iterator over hash map entries. Checks if the given validation
3475 * entry is for the same challenge as what is given in the PONG.
3477 * @param cls the 'struct TransportPongMessage*'
3478 * @param key peer identity
3479 * @param value value in the hash map ('struct ValidationEntry')
3480 * @return GNUNET_YES if we should continue to
3481 * iterate (mismatch), GNUNET_NO if not (entry matched)
3484 check_pending_validation (void *cls,
3485 const GNUNET_HashCode * key,
3488 const struct TransportPongMessage *pong = cls;
3489 struct ValidationEntry *ve = value;
3490 struct AddValidatedAddressContext avac;
3491 unsigned int challenge = ntohl(pong->challenge);
3492 struct GNUNET_HELLO_Message *hello;
3493 struct GNUNET_PeerIdentity target;
3494 struct NeighbourList *n;
3495 struct ForeignAddressList *fal;
3496 struct OwnAddressList *oal;
3497 struct TransportPlugin *tp;
3498 struct GNUNET_MessageHeader *prem;
3504 ps = ntohs (pong->header.size);
3505 if (ps < sizeof (struct TransportPongMessage))
3507 GNUNET_break_op (0);
3510 addr = (const char*) &pong[1];
3511 slen = strlen (ve->transport_name) + 1;
3512 if ( (ps - sizeof (struct TransportPongMessage) < slen) ||
3513 (ve->challenge != challenge) ||
3514 (addr[slen-1] != '\0') ||
3515 (0 != strcmp (addr, ve->transport_name)) ||
3516 (ntohl (pong->purpose.size)
3517 != sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3519 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3520 sizeof (struct GNUNET_PeerIdentity) + ps - sizeof (struct TransportPongMessage)) )
3525 alen = ps - sizeof (struct TransportPongMessage) - slen;
3526 switch (ntohl (pong->purpose.purpose))
3528 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN:
3529 if ( (ve->addrlen + slen != ntohl (pong->addrlen)) ||
3530 (0 != memcmp (&addr[slen],
3534 return GNUNET_YES; /* different entry, keep trying! */
3536 if (0 != memcmp (&pong->pid,
3538 sizeof (struct GNUNET_PeerIdentity)))
3540 GNUNET_break_op (0);
3544 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
3549 GNUNET_break_op (0);
3554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3555 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
3557 a2s (ve->transport_name,
3558 (const struct sockaddr *) ve->addr,
3560 ve->transport_name);
3563 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING:
3564 if (0 != memcmp (&pong->pid,
3566 sizeof (struct GNUNET_PeerIdentity)))
3568 GNUNET_break_op (0);
3571 if (ve->addrlen != 0)
3573 /* must have been for a different validation entry */
3576 tp = find_transport (ve->transport_name);
3582 oal = tp->addresses;
3585 if ( (oal->addrlen == alen) &&
3586 (0 == memcmp (&oal[1],
3594 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3595 _("Not accepting PONG with address `%s' since I cannot confirm having this address.\n"),
3596 a2s (ve->transport_name,
3602 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING,
3607 GNUNET_break_op (0);
3612 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3613 "Confirmed that peer `%4s' is talking to us using address `%s' (%s) for us.\n",
3615 a2s (ve->transport_name,
3618 ve->transport_name);
3622 GNUNET_break_op (0);
3625 if (GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value == 0)
3627 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3628 _("Received expired signature. Check system time.\n"));
3631 GNUNET_STATISTICS_update (stats,
3632 gettext_noop ("# address validation successes"),
3635 /* create the updated HELLO */
3636 GNUNET_CRYPTO_hash (&ve->publicKey,
3637 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3638 &target.hashPubKey);
3639 if (ve->addr != NULL)
3641 avac.done = GNUNET_NO;
3643 hello = GNUNET_HELLO_create (&ve->publicKey,
3644 &add_validated_address,
3646 GNUNET_PEERINFO_add_peer (peerinfo,
3648 GNUNET_free (hello);
3650 n = find_neighbour (&target);
3653 n->publicKey = ve->publicKey;
3654 n->public_key_valid = GNUNET_YES;
3655 fal = add_peer_address (n,
3660 GNUNET_assert (fal != NULL);
3661 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
3662 fal->validated = GNUNET_YES;
3663 mark_address_connected (fal);
3664 GNUNET_STATISTICS_update (stats,
3665 gettext_noop ("# peer addresses considered valid"),
3668 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
3669 schedule_next_ping (fal);
3670 if (n->latency.rel_value == GNUNET_TIME_UNIT_FOREVER_REL.rel_value)
3671 n->latency = fal->latency;
3673 n->latency.rel_value = (fal->latency.rel_value + n->latency.rel_value) / 2;
3675 n->distance = fal->distance;
3676 if (GNUNET_NO == n->received_pong)
3678 n->received_pong = GNUNET_YES;
3679 notify_clients_connect (&target, n->latency, n->distance);
3680 if (NULL != (prem = n->pre_connect_message_buffer))
3682 n->pre_connect_message_buffer = NULL;
3684 struct GNUNET_TRANSPORT_ATS_Information * ats = GNUNET_malloc(2 * sizeof(struct GNUNET_TRANSPORT_ATS_Information));
3685 ats[0].type = htonl(GNUNET_TRANSPORT_LATENCY_LSB);
3686 ats[0].value = htonl(n->latency.rel_value);
3687 ats[1].type = htonl(GNUNET_TRANSPORT_DISTANCE);
3688 ats[1].value = htonl(n->distance);*/
3689 handle_payload_message (prem, n, NULL, 0);
3690 //GNUNET_free (ats);
3694 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3696 GNUNET_SCHEDULER_cancel (n->retry_task);
3697 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3698 try_transmission_to_peer (n);
3702 /* clean up validation entry */
3703 GNUNET_assert (GNUNET_YES ==
3704 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3707 abort_validation (NULL, NULL, ve);
3713 * Function that will be called if we receive a validation
3714 * of an address challenge that we transmitted to another
3715 * peer. Note that the validation should only be considered
3716 * acceptable if the challenge matches AND if the sender
3717 * address is at least a plausible address for this peer
3718 * (otherwise we may be seeing a MiM attack).
3720 * @param cls closure
3721 * @param message the pong message
3722 * @param peer who responded to our challenge
3723 * @param sender_address string describing our sender address (as observed
3724 * by the other peer in binary format)
3725 * @param sender_address_len number of bytes in 'sender_address'
3728 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3729 const struct GNUNET_PeerIdentity *peer,
3730 const char *sender_address,
3731 size_t sender_address_len)
3733 #if DEBUG_TRANSPORT > 1
3734 /* we get tons of these that just get discarded, only log
3735 if we are quite verbose */
3736 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3737 "Receiving `%s' message from `%4s'.\n", "PONG",
3740 GNUNET_STATISTICS_update (stats,
3741 gettext_noop ("# PONG messages received"),
3744 if (GNUNET_SYSERR !=
3745 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3747 &check_pending_validation,
3750 /* This is *expected* to happen a lot since we send
3751 PONGs to *all* known addresses of the sender of
3752 the PING, so most likely we get multiple PONGs
3753 per PING, and all but the first PONG will end up
3754 here. So really we should not print anything here
3755 unless we want to be very, very verbose... */
3756 #if DEBUG_TRANSPORT > 2
3757 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3758 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3770 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3772 * @param cls the 'struct ValidationEntry*'
3773 * @param neighbour neighbour to validate, NULL if validation failed
3776 transmit_hello_and_ping (void *cls,
3777 struct NeighbourList *neighbour)
3779 struct ValidationEntry *va = cls;
3780 struct ForeignAddressList *peer_address;
3781 struct TransportPingMessage ping;
3782 uint16_t hello_size;
3785 struct GNUNET_PeerIdentity id;
3788 GNUNET_CRYPTO_hash (&va->publicKey,
3789 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3791 if (neighbour == NULL)
3793 /* FIXME: stats... */
3794 GNUNET_break (GNUNET_OK ==
3795 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3798 abort_validation (NULL, NULL, va);
3801 neighbour->publicKey = va->publicKey;
3802 neighbour->public_key_valid = GNUNET_YES;
3803 peer_address = add_peer_address (neighbour,
3804 va->transport_name, NULL,
3805 (const void*) &va[1],
3807 if (peer_address == NULL)
3809 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3810 "Failed to add peer `%4s' for plugin `%s'\n",
3811 GNUNET_i2s (&neighbour->id),
3812 va->transport_name);
3813 GNUNET_break (GNUNET_OK ==
3814 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3817 abort_validation (NULL, NULL, va);
3820 hello_size = GNUNET_HELLO_size(our_hello);
3821 slen = strlen(va->transport_name) + 1;
3822 tsize = sizeof(struct TransportPingMessage) + hello_size + va->addrlen + slen;
3823 message_buf = GNUNET_malloc(tsize);
3824 ping.challenge = htonl(va->challenge);
3825 ping.header.size = htons(sizeof(struct TransportPingMessage) + slen + va->addrlen);
3826 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3827 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3828 memcpy(message_buf, our_hello, hello_size);
3829 memcpy(&message_buf[hello_size],
3831 sizeof(struct TransportPingMessage));
3832 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3835 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3839 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3840 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3843 : a2s (va->transport_name,
3844 (const void*) &va[1], va->addrlen),
3846 GNUNET_i2s (&neighbour->id),
3847 "HELLO", hello_size,
3848 "PING", sizeof (struct TransportPingMessage) + va->addrlen + slen);
3851 GNUNET_STATISTICS_update (stats,
3852 gettext_noop ("# PING messages sent for initial validation"),
3855 transmit_to_peer (NULL, peer_address,
3856 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3857 HELLO_VERIFICATION_TIMEOUT,
3859 GNUNET_YES, neighbour);
3860 GNUNET_free(message_buf);
3865 * Check if the given address is already being validated; if not,
3866 * append the given address to the list of entries that are being be
3867 * validated and initiate validation.
3869 * @param cls closure ('struct CheckHelloValidatedContext *')
3870 * @param tname name of the transport
3871 * @param expiration expiration time
3872 * @param addr the address
3873 * @param addrlen length of the address
3874 * @return GNUNET_OK (always)
3877 run_validation (void *cls,
3879 struct GNUNET_TIME_Absolute expiration,
3883 struct CheckHelloValidatedContext *chvc = cls;
3884 struct GNUNET_PeerIdentity id;
3885 struct TransportPlugin *tp;
3886 struct ValidationEntry *va;
3887 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3888 struct CheckAddressExistsClosure caec;
3889 struct OwnAddressList *oal;
3891 GNUNET_assert (addr != NULL);
3893 GNUNET_STATISTICS_update (stats,
3894 gettext_noop ("# peer addresses scheduled for validation"),
3897 tp = find_transport (tname);
3900 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3901 GNUNET_ERROR_TYPE_BULK,
3903 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3905 GNUNET_STATISTICS_update (stats,
3906 gettext_noop ("# peer addresses not validated (plugin not available)"),
3911 /* check if this is one of our own addresses */
3912 oal = tp->addresses;
3915 if ( (oal->addrlen == addrlen) &&
3916 (0 == memcmp (&oal[1],
3920 /* not plausible, this address is equivalent to our own address! */
3921 GNUNET_STATISTICS_update (stats,
3922 gettext_noop ("# peer addresses not validated (loopback)"),
3929 GNUNET_HELLO_get_key (chvc->hello, &pk);
3930 GNUNET_CRYPTO_hash (&pk,
3932 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3935 if (is_blacklisted(&id, tp))
3938 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3939 "Attempted to validate blacklisted peer `%s' using `%s'!\n",
3947 caec.addrlen = addrlen;
3948 caec.session = NULL;
3950 caec.exists = GNUNET_NO;
3951 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3952 &check_address_exists,
3954 if (caec.exists == GNUNET_YES)
3956 /* During validation attempts we will likely trigger the other
3957 peer trying to validate our address which in turn will cause
3958 it to send us its HELLO, so we expect to hit this case rather
3959 frequently. Only print something if we are very verbose. */
3960 #if DEBUG_TRANSPORT > 1
3961 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3962 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3963 a2s (tname, addr, addrlen),
3967 GNUNET_STATISTICS_update (stats,
3968 gettext_noop ("# peer addresses not validated (in progress)"),
3973 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
3976 va->transport_name = GNUNET_strdup (tname);
3977 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
3979 va->send_time = GNUNET_TIME_absolute_get();
3980 va->addr = (const void*) &va[1];
3981 memcpy (&va[1], addr, addrlen);
3982 va->addrlen = addrlen;
3983 GNUNET_HELLO_get_key (chvc->hello,
3985 va->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_VERIFICATION_TIMEOUT,
3986 &timeout_hello_validation,
3988 GNUNET_CONTAINER_multihashmap_put (validation_map,
3991 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3992 setup_peer_check_blacklist (&id, GNUNET_NO,
3993 &transmit_hello_and_ping,
4000 * Check if addresses in validated hello "h" overlap with
4001 * those in "chvc->hello" and validate the rest.
4003 * @param cls closure
4004 * @param peer id of the peer, NULL for last call
4005 * @param h hello message for the peer (can be NULL)
4008 check_hello_validated (void *cls,
4009 const struct GNUNET_PeerIdentity *peer,
4010 const struct GNUNET_HELLO_Message *h)
4012 struct CheckHelloValidatedContext *chvc = cls;
4013 struct GNUNET_HELLO_Message *plain_hello;
4014 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
4015 struct GNUNET_PeerIdentity target;
4016 struct NeighbourList *n;
4020 GNUNET_STATISTICS_update (stats,
4021 gettext_noop ("# outstanding peerinfo iterate requests"),
4025 if (GNUNET_NO == chvc->hello_known)
4027 /* notify PEERINFO about the peer now, so that we at least
4028 have the public key if some other component needs it */
4029 GNUNET_HELLO_get_key (chvc->hello, &pk);
4030 GNUNET_CRYPTO_hash (&pk,
4031 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4032 &target.hashPubKey);
4033 plain_hello = GNUNET_HELLO_create (&pk,
4036 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
4037 GNUNET_free (plain_hello);
4038 #if DEBUG_TRANSPORT_HELLO
4039 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4040 "PEERINFO had no `%s' message for peer `%4s', full validation needed.\n",
4042 GNUNET_i2s (&target));
4044 GNUNET_STATISTICS_update (stats,
4045 gettext_noop ("# new HELLOs requiring full validation"),
4048 GNUNET_HELLO_iterate_addresses (chvc->hello,
4055 GNUNET_STATISTICS_update (stats,
4056 gettext_noop ("# duplicate HELLO (peer known)"),
4061 if (chvc->ve_count == 0)
4063 GNUNET_CONTAINER_DLL_remove (chvc_head,
4072 #if DEBUG_TRANSPORT_HELLO
4073 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4074 "PEERINFO had `%s' message for peer `%4s', validating only new addresses.\n",
4078 chvc->hello_known = GNUNET_YES;
4079 n = find_neighbour (peer);
4082 #if DEBUG_TRANSPORT_HELLO
4083 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4084 "Calling hello_iterate_addresses for %s!\n",
4087 GNUNET_HELLO_iterate_addresses (h,
4089 &add_to_foreign_address_list,
4091 try_transmission_to_peer (n);
4095 #if DEBUG_TRANSPORT_HELLO
4096 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4097 "No existing neighbor record for %s!\n",
4100 GNUNET_STATISTICS_update (stats,
4101 gettext_noop ("# no existing neighbour record (validating HELLO)"),
4105 GNUNET_STATISTICS_update (stats,
4106 gettext_noop ("# HELLO validations (update case)"),
4109 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
4111 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
4118 * Process HELLO-message.
4120 * @param plugin transport involved, may be NULL
4121 * @param message the actual message
4122 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
4125 process_hello (struct TransportPlugin *plugin,
4126 const struct GNUNET_MessageHeader *message)
4129 struct GNUNET_PeerIdentity target;
4130 const struct GNUNET_HELLO_Message *hello;
4131 struct CheckHelloValidatedContext *chvc;
4132 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
4133 #if DEBUG_TRANSPORT_HELLO > 2
4136 hsize = ntohs (message->size);
4137 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
4138 (hsize < sizeof (struct GNUNET_MessageHeader)))
4141 return GNUNET_SYSERR;
4143 GNUNET_STATISTICS_update (stats,
4144 gettext_noop ("# HELLOs received for validation"),
4148 /* first, check if load is too high */
4149 if (GNUNET_SCHEDULER_get_load (GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
4151 GNUNET_STATISTICS_update (stats,
4152 gettext_noop ("# HELLOs ignored due to high load"),
4155 #if DEBUG_TRANSPORT_HELLO
4156 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4157 "Ignoring `%s' for `%4s', load too high.\n",
4159 GNUNET_i2s (&target));
4163 hello = (const struct GNUNET_HELLO_Message *) message;
4164 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
4166 #if DEBUG_TRANSPORT_HELLO
4167 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4168 "Unable to get public key from `%s' for `%4s'!\n",
4170 GNUNET_i2s (&target));
4172 GNUNET_break_op (0);
4173 return GNUNET_SYSERR;
4176 GNUNET_CRYPTO_hash (&publicKey,
4177 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4178 &target.hashPubKey);
4180 #if DEBUG_TRANSPORT_HELLO
4181 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4182 "Received `%s' message for `%4s'\n",
4184 GNUNET_i2s (&target));
4187 if (0 == memcmp (&my_identity,
4189 sizeof (struct GNUNET_PeerIdentity)))
4191 GNUNET_STATISTICS_update (stats,
4192 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
4198 while (NULL != chvc)
4200 if (GNUNET_HELLO_equals (hello,
4202 GNUNET_TIME_absolute_get ()).abs_value > 0)
4204 #if DEBUG_TRANSPORT_HELLO > 2
4205 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4206 "Received duplicate `%s' message for `%4s'; ignored\n",
4208 GNUNET_i2s (&target));
4210 return GNUNET_OK; /* validation already pending */
4212 if (GNUNET_HELLO_size(hello) == GNUNET_HELLO_size (chvc->hello))
4213 GNUNET_break (0 != memcmp (hello, chvc->hello,
4214 GNUNET_HELLO_size(hello)));
4219 struct NeighbourList *temp_neighbor = find_neighbour(&target);
4220 if ((NULL != temp_neighbor))
4222 fprintf(stderr, "Already know peer, ignoring hello\n");
4227 #if DEBUG_TRANSPORT_HELLO > 2
4230 my_id = GNUNET_strdup(GNUNET_i2s(plugin->env.my_identity));
4231 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4232 "%s: Starting validation of `%s' message for `%4s' via '%s' of size %u\n",
4235 GNUNET_i2s (&target),
4237 GNUNET_HELLO_size(hello));
4241 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
4243 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
4244 memcpy (&chvc[1], hello, hsize);
4245 GNUNET_CONTAINER_DLL_insert (chvc_head,
4248 /* finally, check if HELLO was previously validated
4249 (continuation will then schedule actual validation) */
4250 GNUNET_STATISTICS_update (stats,
4251 gettext_noop ("# peerinfo process hello iterate requests"),
4254 GNUNET_STATISTICS_update (stats,
4255 gettext_noop ("# outstanding peerinfo iterate requests"),
4258 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
4260 HELLO_VERIFICATION_TIMEOUT,
4261 &check_hello_validated, chvc);
4267 * The peer specified by the given neighbour has timed-out or a plugin
4268 * has disconnected. We may either need to do nothing (other plugins
4269 * still up), or trigger a full disconnect and clean up. This
4270 * function updates our state and does the necessary notifications.
4271 * Also notifies our clients that the neighbour is now officially
4274 * @param n the neighbour list entry for the peer
4275 * @param check GNUNET_YES to check if ALL addresses for this peer
4276 * are gone, GNUNET_NO to force a disconnect of the peer
4277 * regardless of whether other addresses exist.
4280 disconnect_neighbour (struct NeighbourList *n, int check)
4282 struct ReadyList *rpos;
4283 struct NeighbourList *npos;
4284 struct NeighbourList *nprev;
4285 struct MessageQueue *mq;
4286 struct ForeignAddressList *peer_addresses;
4287 struct ForeignAddressList *peer_pos;
4289 if (GNUNET_YES == check)
4292 while (NULL != rpos)
4294 peer_addresses = rpos->addresses;
4295 while (peer_addresses != NULL)
4297 if (GNUNET_YES == peer_addresses->connected)
4299 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4300 "NOT Disconnecting from `%4s', still have live addresses!\n",
4301 GNUNET_i2s (&n->id));
4302 return; /* still connected */
4304 peer_addresses = peer_addresses->next;
4310 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4311 "Disconnecting from `%4s'\n",
4312 GNUNET_i2s (&n->id));
4314 /* remove n from neighbours list */
4317 while ((npos != NULL) && (npos != n))
4322 GNUNET_assert (npos != NULL);
4324 neighbours = n->next;
4326 nprev->next = n->next;
4328 /* notify all clients about disconnect */
4329 if (GNUNET_YES == n->received_pong)
4330 notify_clients_disconnect (&n->id);
4332 /* clean up all plugins, cancel connections and pending transmissions */
4333 while (NULL != (rpos = n->plugins))
4335 n->plugins = rpos->next;
4336 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
4337 while (rpos->addresses != NULL)
4339 peer_pos = rpos->addresses;
4340 rpos->addresses = peer_pos->next;
4341 if (peer_pos->connected == GNUNET_YES)
4342 GNUNET_STATISTICS_update (stats,
4343 gettext_noop ("# connected addresses"),
4346 if (GNUNET_YES == peer_pos->validated)
4347 GNUNET_STATISTICS_update (stats,
4348 gettext_noop ("# peer addresses considered valid"),
4351 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
4353 GNUNET_SCHEDULER_cancel (peer_pos->revalidate_task);
4354 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
4356 GNUNET_free(peer_pos);
4361 /* free all messages on the queue */
4362 while (NULL != (mq = n->messages_head))
4364 GNUNET_STATISTICS_update (stats,
4365 gettext_noop ("# bytes in message queue for other peers"),
4366 - (int64_t) mq->message_buf_size,
4368 GNUNET_STATISTICS_update (stats,
4369 gettext_noop ("# bytes discarded due to disconnect"),
4370 mq->message_buf_size,
4372 GNUNET_CONTAINER_DLL_remove (n->messages_head,
4375 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
4377 sizeof(struct GNUNET_PeerIdentity)));
4380 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
4382 GNUNET_SCHEDULER_cancel (n->timeout_task);
4383 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
4385 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
4387 GNUNET_SCHEDULER_cancel (n->retry_task);
4388 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
4390 if (n->piter != NULL)
4392 GNUNET_PEERINFO_iterate_cancel (n->piter);
4393 GNUNET_STATISTICS_update (stats,
4394 gettext_noop ("# outstanding peerinfo iterate requests"),
4399 /* finally, free n itself */
4400 GNUNET_STATISTICS_update (stats,
4401 gettext_noop ("# active neighbours"),
4404 GNUNET_free_non_null (n->pre_connect_message_buffer);
4410 * We have received a PING message from someone. Need to send a PONG message
4411 * in response to the peer by any means necessary.
4414 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
4415 const struct GNUNET_PeerIdentity *peer,
4416 struct Session *session,
4417 const char *sender_address,
4418 uint16_t sender_address_len)
4420 struct TransportPlugin *plugin = cls;
4421 struct SessionHeader *session_header = (struct SessionHeader*) session;
4422 struct TransportPingMessage *ping;
4423 struct TransportPongMessage *pong;
4424 struct NeighbourList *n;
4425 struct ReadyList *rl;
4426 struct ForeignAddressList *fal;
4427 struct OwnAddressList *oal;
4432 if (ntohs (message->size) < sizeof (struct TransportPingMessage))
4434 GNUNET_break_op (0);
4435 return GNUNET_SYSERR;
4438 ping = (struct TransportPingMessage *) message;
4439 if (0 != memcmp (&ping->target,
4440 plugin->env.my_identity,
4441 sizeof (struct GNUNET_PeerIdentity)))
4443 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4444 _("Received `%s' message from `%s' destined for `%s' which is not me!\n"),
4446 (sender_address != NULL)
4447 ? a2s (plugin->short_name,
4448 (const struct sockaddr *)sender_address,
4451 GNUNET_i2s (&ping->target));
4452 return GNUNET_SYSERR;
4455 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4456 "Processing `%s' from `%s'\n",
4458 (sender_address != NULL)
4459 ? a2s (plugin->short_name,
4460 (const struct sockaddr *)sender_address,
4464 GNUNET_STATISTICS_update (stats,
4465 gettext_noop ("# PING messages received"),
4468 addr = (const char*) &ping[1];
4469 alen = ntohs (message->size) - sizeof (struct TransportPingMessage);
4470 slen = strlen (plugin->short_name) + 1;
4473 /* peer wants to confirm that we have an outbound connection to him */
4474 if (session == NULL)
4476 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4477 _("Refusing to create PONG since I do not have a session with `%s'.\n"),
4479 return GNUNET_SYSERR;
4481 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4482 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4483 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4484 pong->purpose.size =
4485 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4487 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4488 sizeof (struct GNUNET_PeerIdentity) + sender_address_len + slen);
4489 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING);
4490 pong->challenge = ping->challenge;
4491 pong->addrlen = htonl(sender_address_len + slen);
4494 sizeof(struct GNUNET_PeerIdentity));
4498 memcpy (&((char*)&pong[1])[slen],
4500 sender_address_len);
4501 if (GNUNET_TIME_absolute_get_remaining (session_header->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4)
4503 /* create / update cached sig */
4505 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4506 "Creating PONG signature to indicate active connection.\n");
4508 session_header->pong_sig_expires = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
4509 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4510 GNUNET_assert (GNUNET_OK ==
4511 GNUNET_CRYPTO_rsa_sign (my_private_key,
4513 &session_header->pong_signature));
4517 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4519 memcpy (&pong->signature,
4520 &session_header->pong_signature,
4521 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4527 /* peer wants to confirm that this is one of our addresses */
4531 plugin->api->check_address (plugin->api->cls,
4535 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4536 _("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
4537 a2s (plugin->short_name,
4542 oal = plugin->addresses;
4545 if ( (oal->addrlen == alen) &&
4552 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
4553 pong->header.size = htons (sizeof (struct TransportPongMessage) + alen + slen);
4554 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4555 pong->purpose.size =
4556 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4558 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4559 sizeof (struct GNUNET_PeerIdentity) + alen + slen);
4560 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
4561 pong->challenge = ping->challenge;
4562 pong->addrlen = htonl(alen + slen);
4565 sizeof(struct GNUNET_PeerIdentity));
4566 memcpy (&pong[1], plugin->short_name, slen);
4567 memcpy (&((char*)&pong[1])[slen], addr, alen);
4568 if ( (oal != NULL) &&
4569 (GNUNET_TIME_absolute_get_remaining (oal->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4) )
4571 /* create / update cached sig */
4573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4574 "Creating PONG signature to indicate ownership.\n");
4576 oal->pong_sig_expires = GNUNET_TIME_absolute_min (oal->expires,
4577 GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4578 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4579 GNUNET_assert (GNUNET_OK ==
4580 GNUNET_CRYPTO_rsa_sign (my_private_key,
4582 &oal->pong_signature));
4583 memcpy (&pong->signature,
4584 &oal->pong_signature,
4585 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4587 else if (oal == NULL)
4589 /* not using cache (typically DV-only) */
4590 pong->expiration = GNUNET_TIME_absolute_hton (GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4591 GNUNET_assert (GNUNET_OK ==
4592 GNUNET_CRYPTO_rsa_sign (my_private_key,
4598 /* can used cached version */
4599 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4600 memcpy (&pong->signature,
4601 &oal->pong_signature,
4602 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4605 n = find_neighbour(peer);
4606 GNUNET_assert (n != NULL);
4607 /* first try reliable response transmission */
4611 fal = rl->addresses;
4614 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4617 ntohs (pong->header.size),
4618 TRANSPORT_PONG_PRIORITY,
4619 HELLO_VERIFICATION_TIMEOUT,
4627 GNUNET_STATISTICS_update (stats,
4628 gettext_noop ("# PONGs unicast via reliable transport"),
4638 /* no reliable method found, do multicast */
4639 GNUNET_STATISTICS_update (stats,
4640 gettext_noop ("# PONGs multicast to all available addresses"),
4646 fal = rl->addresses;
4649 transmit_to_peer(NULL, fal,
4650 TRANSPORT_PONG_PRIORITY,
4651 HELLO_VERIFICATION_TIMEOUT,
4653 ntohs(pong->header.size),
4666 * Function called by the plugin for each received message.
4667 * Update data volumes, possibly notify plugins about
4668 * reducing the rate at which they read from the socket
4669 * and generally forward to our receive callback.
4671 * @param cls the "struct TransportPlugin *" we gave to the plugin
4672 * @param peer (claimed) identity of the other peer
4673 * @param message the message, NULL if we only care about
4674 * learning about the delay until we should receive again
4675 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
4676 * @param session identifier used for this session (can be NULL)
4677 * @param sender_address binary address of the sender (if observed)
4678 * @param sender_address_len number of bytes in sender_address
4679 * @return how long in ms the plugin should wait until receiving more data
4680 * (plugins that do not support this, can ignore the return value)
4682 static struct GNUNET_TIME_Relative
4683 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4684 const struct GNUNET_MessageHeader *message,
4686 struct Session *session,
4687 const char *sender_address,
4688 uint16_t sender_address_len)
4690 struct TransportPlugin *plugin = cls;
4691 struct ReadyList *service_context;
4692 struct ForeignAddressList *peer_address;
4694 struct NeighbourList *n;
4695 struct GNUNET_TIME_Relative ret;
4696 if (is_blacklisted (peer, plugin))
4697 return GNUNET_TIME_UNIT_FOREVER_REL;
4699 n = find_neighbour (peer);
4701 n = setup_new_neighbour (peer, GNUNET_YES);
4702 service_context = n->plugins;
4703 while ((service_context != NULL) && (plugin != service_context->plugin))
4704 service_context = service_context->next;
4705 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4706 peer_address = NULL;
4707 if (message != NULL)
4709 if ( (session != NULL) ||
4710 (sender_address != NULL) )
4711 peer_address = add_peer_address (n,
4715 sender_address_len);
4716 if (peer_address != NULL)
4718 peer_address->distance = distance;
4719 if (GNUNET_YES == peer_address->validated)
4720 mark_address_connected (peer_address);
4721 peer_address->timeout
4723 GNUNET_TIME_relative_to_absolute
4724 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4725 schedule_next_ping (peer_address);
4727 /* update traffic received amount ... */
4728 msize = ntohs (message->size);
4729 GNUNET_STATISTICS_update (stats,
4730 gettext_noop ("# bytes received from other peers"),
4733 n->distance = distance;
4735 GNUNET_TIME_relative_to_absolute
4736 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4737 GNUNET_SCHEDULER_cancel (n->timeout_task);
4739 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4740 &neighbour_timeout_task, n);
4741 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4743 /* dropping message due to frequent inbound volume violations! */
4744 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4745 GNUNET_ERROR_TYPE_BULK,
4747 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4748 n->in_tracker.available_bytes_per_s__,
4749 n->quota_violation_count);
4750 GNUNET_STATISTICS_update (stats,
4751 gettext_noop ("# bandwidth quota violations by other peers"),
4754 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4758 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4759 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
4760 ntohs (message->type),
4761 ntohs (message->size),
4764 switch (ntohs (message->type))
4766 case GNUNET_MESSAGE_TYPE_HELLO:
4767 GNUNET_STATISTICS_update (stats,
4768 gettext_noop ("# HELLO messages received from other peers"),
4771 process_hello (plugin, message);
4773 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4774 handle_ping (plugin, message, peer, session, sender_address, sender_address_len);
4776 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4777 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4781 handle_payload_message (message, n, NULL, 0);
4785 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4786 if (ret.rel_value > 0)
4788 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4789 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4790 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4791 (unsigned int) n->in_tracker.available_bytes_per_s__,
4792 (unsigned long long) ret.rel_value);
4793 GNUNET_STATISTICS_update (stats,
4794 gettext_noop ("# ms throttling suggested"),
4795 (int64_t) ret.rel_value,
4802 * Handle START-message. This is the first message sent to us
4803 * by any client which causes us to add it to our list.
4805 * @param cls closure (always NULL)
4806 * @param client identification of the client
4807 * @param message the actual message
4810 handle_start (void *cls,
4811 struct GNUNET_SERVER_Client *client,
4812 const struct GNUNET_MessageHeader *message)
4814 const struct StartMessage *start;
4815 struct TransportClient *c;
4816 struct ConnectInfoMessage cim;
4817 struct NeighbourList *n;
4819 start = (const struct StartMessage*) message;
4821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4822 "Received `%s' request from client\n", "START");
4827 if (c->client == client)
4829 /* client already on our list! */
4831 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4836 if ( (GNUNET_NO != ntohl (start->do_check)) &&
4837 (0 != memcmp (&start->self,
4839 sizeof (struct GNUNET_PeerIdentity))) )
4841 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4842 _("Rejecting control connection from peer `%s', which is not me!\n"),
4843 GNUNET_i2s (&start->self));
4844 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4847 c = GNUNET_malloc (sizeof (struct TransportClient));
4851 if (our_hello != NULL)
4854 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4855 "Sending our own `%s' to new client\n", "HELLO");
4857 transmit_to_client (c,
4858 (const struct GNUNET_MessageHeader *) our_hello,
4860 /* tell new client about all existing connections */
4861 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
4862 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4866 if (GNUNET_YES == n->received_pong)
4869 cim.latency = GNUNET_TIME_relative_hton (n->latency);
4870 cim.distance = htonl (n->distance);
4871 transmit_to_client (c, &cim.header, GNUNET_NO);
4876 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4881 * Handle HELLO-message.
4883 * @param cls closure (always NULL)
4884 * @param client identification of the client
4885 * @param message the actual message
4888 handle_hello (void *cls,
4889 struct GNUNET_SERVER_Client *client,
4890 const struct GNUNET_MessageHeader *message)
4894 GNUNET_STATISTICS_update (stats,
4895 gettext_noop ("# HELLOs received from clients"),
4898 ret = process_hello (NULL, message);
4899 GNUNET_SERVER_receive_done (client, ret);
4904 * Closure for 'transmit_client_message'; followed by
4905 * 'msize' bytes of the actual message.
4907 struct TransmitClientMessageContext
4910 * Client on whom's behalf we are sending.
4912 struct GNUNET_SERVER_Client *client;
4915 * Timeout for the transmission.
4917 struct GNUNET_TIME_Absolute timeout;
4925 * Size of the message in bytes.
4932 * Schedule transmission of a message we got from a client to a peer.
4934 * @param cls the 'struct TransmitClientMessageContext*'
4935 * @param n destination, or NULL on error (in that case, drop the message)
4938 transmit_client_message (void *cls,
4939 struct NeighbourList *n)
4941 struct TransmitClientMessageContext *tcmc = cls;
4942 struct TransportClient *tc;
4945 while ((tc != NULL) && (tc->client != tcmc->client))
4950 transmit_to_peer (tc, NULL, tcmc->priority,
4951 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
4953 tcmc->msize, GNUNET_NO, n);
4955 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
4956 GNUNET_SERVER_client_drop (tcmc->client);
4962 * Handle SEND-message.
4964 * @param cls closure (always NULL)
4965 * @param client identification of the client
4966 * @param message the actual message
4969 handle_send (void *cls,
4970 struct GNUNET_SERVER_Client *client,
4971 const struct GNUNET_MessageHeader *message)
4973 const struct OutboundMessage *obm;
4974 const struct GNUNET_MessageHeader *obmm;
4975 struct TransmitClientMessageContext *tcmc;
4979 size = ntohs (message->size);
4981 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
4984 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4987 GNUNET_STATISTICS_update (stats,
4988 gettext_noop ("# payload received for other peers"),
4991 obm = (const struct OutboundMessage *) message;
4992 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
4993 msize = size - sizeof (struct OutboundMessage);
4995 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4996 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
4997 "SEND", GNUNET_i2s (&obm->peer),
5001 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
5002 tcmc->client = client;
5003 tcmc->priority = ntohl (obm->priority);
5004 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
5005 tcmc->msize = msize;
5006 /* FIXME: this memcpy can be up to 7% of our total runtime */
5007 memcpy (&tcmc[1], obmm, msize);
5008 GNUNET_SERVER_client_keep (client);
5009 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
5010 &transmit_client_message,
5016 * Handle request connect message
5018 * @param cls closure (always NULL)
5019 * @param client identification of the client
5020 * @param message the actual message
5023 handle_request_connect (void *cls,
5024 struct GNUNET_SERVER_Client *client,
5025 const struct GNUNET_MessageHeader *message)
5027 const struct TransportRequestConnectMessage *trcm =
5028 (const struct TransportRequestConnectMessage *) message;
5030 GNUNET_STATISTICS_update (stats,
5031 gettext_noop ("# REQUEST CONNECT messages received"),
5034 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received a request connect message for peer %s\n", GNUNET_i2s(&trcm->peer));
5035 setup_peer_check_blacklist (&trcm->peer, GNUNET_YES,
5037 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5041 * Handle SET_QUOTA-message.
5043 * @param cls closure (always NULL)
5044 * @param client identification of the client
5045 * @param message the actual message
5048 handle_set_quota (void *cls,
5049 struct GNUNET_SERVER_Client *client,
5050 const struct GNUNET_MessageHeader *message)
5052 const struct QuotaSetMessage *qsm =
5053 (const struct QuotaSetMessage *) message;
5054 struct NeighbourList *n;
5056 GNUNET_STATISTICS_update (stats,
5057 gettext_noop ("# SET QUOTA messages received"),
5060 n = find_neighbour (&qsm->peer);
5063 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5064 GNUNET_STATISTICS_update (stats,
5065 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
5071 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5072 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
5074 (unsigned int) ntohl (qsm->quota.value__),
5075 (unsigned int) n->in_tracker.available_bytes_per_s__,
5076 GNUNET_i2s (&qsm->peer));
5078 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
5080 if (0 == ntohl (qsm->quota.value__))
5082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5083 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&n->id),
5085 disconnect_neighbour (n, GNUNET_NO);
5087 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5092 * Take the given address and append it to the set of results sent back to
5095 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
5096 * @param address the resolved name, NULL to indicate the last response
5099 transmit_address_to_client (void *cls, const char *address)
5101 struct GNUNET_SERVER_TransmitContext *tc = cls;
5104 if (NULL == address)
5107 slen = strlen (address) + 1;
5109 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
5110 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5111 if (NULL == address)
5112 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
5117 * Handle AddressLookup-message.
5119 * @param cls closure (always NULL)
5120 * @param client identification of the client
5121 * @param message the actual message
5124 handle_address_lookup (void *cls,
5125 struct GNUNET_SERVER_Client *client,
5126 const struct GNUNET_MessageHeader *message)
5128 const struct AddressLookupMessage *alum;
5129 struct TransportPlugin *lsPlugin;
5130 const char *nameTransport;
5131 const char *address;
5133 struct GNUNET_SERVER_TransmitContext *tc;
5134 struct GNUNET_TIME_Absolute timeout;
5135 struct GNUNET_TIME_Relative rtimeout;
5138 size = ntohs (message->size);
5139 if (size < sizeof (struct AddressLookupMessage))
5141 GNUNET_break_op (0);
5142 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5145 alum = (const struct AddressLookupMessage *) message;
5146 uint32_t addressLen = ntohl (alum->addrlen);
5147 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
5149 GNUNET_break_op (0);
5150 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5153 address = (const char *) &alum[1];
5154 nameTransport = (const char *) &address[addressLen];
5156 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
5158 GNUNET_break_op (0);
5159 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5162 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
5163 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
5164 numeric = ntohl (alum->numeric_only);
5165 lsPlugin = find_transport (nameTransport);
5166 if (NULL == lsPlugin)
5168 tc = GNUNET_SERVER_transmit_context_create (client);
5169 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
5170 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5171 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
5174 tc = GNUNET_SERVER_transmit_context_create (client);
5175 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
5177 address, addressLen,
5180 &transmit_address_to_client, tc);
5185 * Setup the environment for this plugin.
5188 create_environment (struct TransportPlugin *plug)
5190 plug->env.cfg = cfg;
5191 plug->env.my_identity = &my_identity;
5192 plug->env.our_hello = &our_hello;
5193 plug->env.cls = plug;
5194 plug->env.receive = &plugin_env_receive;
5195 plug->env.notify_address = &plugin_env_notify_address;
5196 plug->env.session_end = &plugin_env_session_end;
5197 plug->env.max_connections = max_connect_per_transport;
5198 plug->env.stats = stats;
5203 * Start the specified transport (load the plugin).
5206 start_transport (struct GNUNET_SERVER_Handle *server,
5209 struct TransportPlugin *plug;
5212 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5213 _("Loading `%s' transport plugin\n"), name);
5214 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
5215 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
5216 create_environment (plug);
5217 plug->short_name = GNUNET_strdup (name);
5218 plug->lib_name = libname;
5219 plug->next = plugins;
5221 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
5222 if (plug->api == NULL)
5224 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5225 _("Failed to load transport plugin for `%s'\n"), name);
5226 GNUNET_free (plug->short_name);
5227 plugins = plug->next;
5228 GNUNET_free (libname);
5235 * Called whenever a client is disconnected. Frees our
5236 * resources associated with that client.
5238 * @param cls closure
5239 * @param client identification of the client
5242 client_disconnect_notification (void *cls,
5243 struct GNUNET_SERVER_Client *client)
5245 struct TransportClient *pos;
5246 struct TransportClient *prev;
5247 struct ClientMessageQueueEntry *mqe;
5248 struct Blacklisters *bl;
5249 struct BlacklistCheck *bc;
5254 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
5255 "Client disconnected, cleaning up.\n");
5257 /* clean up blacklister */
5261 if (bl->client == client)
5266 if (bc->bl_pos == bl)
5268 bc->bl_pos = bl->next;
5271 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
5274 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
5275 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
5281 GNUNET_CONTAINER_DLL_remove (bl_head,
5284 GNUNET_SERVER_client_drop (bl->client);
5290 /* clean up 'normal' clients */
5293 while ((pos != NULL) && (pos->client != client))
5300 while (NULL != (mqe = pos->message_queue_head))
5302 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
5303 pos->message_queue_tail,
5305 pos->message_count--;
5309 clients = pos->next;
5311 prev->next = pos->next;
5312 if (GNUNET_YES == pos->tcs_pending)
5317 if (pos->th != NULL)
5319 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
5322 GNUNET_break (0 == pos->message_count);
5328 * Function called when the service shuts down. Unloads our plugins
5329 * and cancels pending validations.
5331 * @param cls closure, unused
5332 * @param tc task context (unused)
5335 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5337 struct TransportPlugin *plug;
5338 struct OwnAddressList *al;
5339 struct CheckHelloValidatedContext *chvc;
5341 while (neighbours != NULL)
5343 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5344 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&neighbours->id),
5346 disconnect_neighbour (neighbours, GNUNET_NO);
5349 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5350 "Transport service is unloading plugins...\n");
5352 while (NULL != (plug = plugins))
5354 plugins = plug->next;
5355 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
5357 GNUNET_SCHEDULER_cancel (plug->address_update_task);
5358 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
5360 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
5361 GNUNET_free (plug->lib_name);
5362 GNUNET_free (plug->short_name);
5363 while (NULL != (al = plug->addresses))
5365 plug->addresses = al->next;
5370 if (my_private_key != NULL)
5371 GNUNET_CRYPTO_rsa_key_free (my_private_key);
5372 GNUNET_free_non_null (our_hello);
5374 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
5377 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5378 validation_map = NULL;
5380 /* free 'chvc' data structure */
5381 while (NULL != (chvc = chvc_head))
5383 chvc_head = chvc->next;
5384 if (chvc->piter != NULL)
5386 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
5387 GNUNET_STATISTICS_update (stats,
5388 gettext_noop ("# outstanding peerinfo iterate requests"),
5394 GNUNET_assert (chvc->ve_count == 0);
5401 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5404 if (peerinfo != NULL)
5406 GNUNET_PEERINFO_disconnect (peerinfo);
5409 /* Can we assume those are gone by now, or do we need to clean up
5411 GNUNET_break (bl_head == NULL);
5412 GNUNET_break (bc_head == NULL);
5417 * Initiate transport service.
5419 * @param cls closure
5420 * @param server the initialized server
5421 * @param c configuration to use
5425 struct GNUNET_SERVER_Handle *server,
5426 const struct GNUNET_CONFIGURATION_Handle *c)
5428 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
5429 {&handle_start, NULL,
5430 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
5431 {&handle_hello, NULL,
5432 GNUNET_MESSAGE_TYPE_HELLO, 0},
5433 {&handle_send, NULL,
5434 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
5435 {&handle_request_connect, NULL,
5436 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT, sizeof(struct TransportRequestConnectMessage)},
5437 {&handle_set_quota, NULL,
5438 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
5439 {&handle_address_lookup, NULL,
5440 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
5442 {&handle_blacklist_init, NULL,
5443 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
5444 {&handle_blacklist_reply, NULL,
5445 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
5451 unsigned long long tneigh;
5455 stats = GNUNET_STATISTICS_create ("transport", cfg);
5456 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
5457 /* parse configuration */
5459 GNUNET_CONFIGURATION_get_value_number (c,
5464 GNUNET_CONFIGURATION_get_value_filename (c,
5466 "HOSTKEY", &keyfile)))
5468 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5470 ("Transport service is lacking key configuration settings. Exiting.\n"));
5471 GNUNET_SCHEDULER_shutdown ();
5474 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5477 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5478 validation_map = NULL;
5481 max_connect_per_transport = (uint32_t) tneigh;
5482 peerinfo = GNUNET_PEERINFO_connect (cfg);
5483 if (peerinfo == NULL)
5485 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5486 _("Could not access PEERINFO service. Exiting.\n"));
5487 GNUNET_SCHEDULER_shutdown ();
5490 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5493 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5494 validation_map = NULL;
5495 GNUNET_free (keyfile);
5498 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
5499 GNUNET_free (keyfile);
5500 if (my_private_key == NULL)
5502 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5504 ("Transport service could not access hostkey. Exiting.\n"));
5505 GNUNET_SCHEDULER_shutdown ();
5508 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5511 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5512 validation_map = NULL;
5515 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
5516 GNUNET_CRYPTO_hash (&my_public_key,
5517 sizeof (my_public_key), &my_identity.hashPubKey);
5518 /* setup notification */
5519 GNUNET_SERVER_disconnect_notify (server,
5520 &client_disconnect_notification, NULL);
5521 /* load plugins... */
5524 GNUNET_CONFIGURATION_get_value_string (c,
5525 "TRANSPORT", "PLUGINS", &plugs))
5527 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5528 _("Starting transport plugins `%s'\n"), plugs);
5529 pos = strtok (plugs, " ");
5532 start_transport (server, pos);
5534 pos = strtok (NULL, " ");
5536 GNUNET_free (plugs);
5538 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
5539 &shutdown_task, NULL);
5544 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
5546 /* If we have a blacklist file, read from it */
5547 read_blacklist_file(cfg);
5548 /* process client requests */
5549 GNUNET_SERVER_add_handlers (server, handlers);
5554 * The main function for the transport service.
5556 * @param argc number of arguments from the command line
5557 * @param argv command line arguments
5558 * @return 0 ok, 1 on error
5561 main (int argc, char *const *argv)
5563 a2s (NULL, NULL, 0); /* make compiler happy */
5564 return (GNUNET_OK ==
5565 GNUNET_SERVICE_run (argc,
5568 GNUNET_SERVICE_OPTION_NONE,
5569 &run, NULL)) ? 0 : 1;
5572 /* end of gnunet-service-transport.c */