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.ats_count = htonl(0);
2226 cim.ats.type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
2227 cim.ats.value = htonl (0);
2228 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
2230 while (cpos != NULL)
2232 transmit_to_client (cpos, &cim.header, GNUNET_NO);
2239 * Notify all of our clients about a peer disconnecting.
2242 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2244 struct DisconnectInfoMessage dim;
2245 struct TransportClient *cpos;
2248 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2249 "Notifying clients about lost connection to `%s'\n",
2252 GNUNET_STATISTICS_update (stats,
2253 gettext_noop ("# peers connected"),
2256 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2257 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2258 dim.reserved = htonl (0);
2259 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2261 while (cpos != NULL)
2263 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2270 * Find a ForeignAddressList entry for the given neighbour
2271 * that matches the given address and transport.
2273 * @param neighbour which peer we care about
2274 * @param tname name of the transport plugin
2275 * @param session session to look for, NULL for 'any'; otherwise
2276 * can be used for the service to "learn" this session ID
2278 * @param addr binary address
2279 * @param addrlen length of addr
2280 * @return NULL if no such entry exists
2282 static struct ForeignAddressList *
2283 find_peer_address(struct NeighbourList *neighbour,
2285 struct Session *session,
2289 struct ReadyList *head;
2290 struct ForeignAddressList *pos;
2292 head = neighbour->plugins;
2293 while (head != NULL)
2295 if (0 == strcmp (tname, head->plugin->short_name))
2301 pos = head->addresses;
2302 while ( (pos != NULL) &&
2303 ( (pos->addrlen != addrlen) ||
2304 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2306 if ( (session != NULL) &&
2307 (pos->session == session) )
2311 if ( (session != NULL) && (pos != NULL) )
2312 pos->session = session; /* learn it! */
2318 * Get the peer address struct for the given neighbour and
2319 * address. If it doesn't yet exist, create it.
2321 * @param neighbour which peer we care about
2322 * @param tname name of the transport plugin
2323 * @param session session of the plugin, or NULL for none
2324 * @param addr binary address
2325 * @param addrlen length of addr
2326 * @return NULL if we do not have a transport plugin for 'tname'
2328 static struct ForeignAddressList *
2329 add_peer_address (struct NeighbourList *neighbour,
2331 struct Session *session,
2335 struct ReadyList *head;
2336 struct ForeignAddressList *ret;
2338 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2341 head = neighbour->plugins;
2343 while (head != NULL)
2345 if (0 == strcmp (tname, head->plugin->short_name))
2351 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2352 ret->session = session;
2355 ret->addr = (const char*) &ret[1];
2356 memcpy (&ret[1], addr, addrlen);
2362 ret->addrlen = addrlen;
2363 ret->expires = GNUNET_TIME_relative_to_absolute
2364 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2365 ret->latency = GNUNET_TIME_relative_get_forever();
2367 ret->timeout = GNUNET_TIME_relative_to_absolute
2368 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2369 ret->ready_list = head;
2370 ret->next = head->addresses;
2371 head->addresses = ret;
2377 * Closure for 'add_validated_address'.
2379 struct AddValidatedAddressContext
2382 * Entry that has been validated.
2384 const struct ValidationEntry *ve;
2387 * Flag set after we have added the address so
2388 * that we terminate the iteration next time.
2395 * Callback function used to fill a buffer of max bytes with a list of
2396 * addresses in the format used by HELLOs. Should use
2397 * "GNUNET_HELLO_add_address" as a helper function.
2399 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2400 * @param max maximum number of bytes that can be written to buf
2401 * @param buf where to write the address information
2402 * @return number of bytes written, 0 to signal the
2403 * end of the iteration.
2406 add_validated_address (void *cls,
2407 size_t max, void *buf)
2409 struct AddValidatedAddressContext *avac = cls;
2410 const struct ValidationEntry *ve = avac->ve;
2412 if (GNUNET_YES == avac->done)
2414 avac->done = GNUNET_YES;
2415 return GNUNET_HELLO_add_address (ve->transport_name,
2416 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2426 * Closure for 'check_address_exists'.
2428 struct CheckAddressExistsClosure
2431 * Address to check for.
2436 * Name of the transport.
2443 struct Session *session;
2446 * Set to GNUNET_YES if the address exists.
2459 * Iterator over hash map entries. Checks if the given
2460 * validation entry is for the same address as what is given
2463 * @param cls the 'struct CheckAddressExistsClosure*'
2464 * @param key current key code (ignored)
2465 * @param value value in the hash map ('struct ValidationEntry')
2466 * @return GNUNET_YES if we should continue to
2467 * iterate (mismatch), GNUNET_NO if not (entry matched)
2470 check_address_exists (void *cls,
2471 const GNUNET_HashCode * key,
2474 struct CheckAddressExistsClosure *caec = cls;
2475 struct ValidationEntry *ve = value;
2477 if ( (0 == strcmp (caec->tname,
2478 ve->transport_name)) &&
2479 (caec->addrlen == ve->addrlen) &&
2480 (0 == memcmp (caec->addr,
2484 caec->exists = GNUNET_YES;
2487 if ( (ve->session != NULL) &&
2488 (caec->session == ve->session) )
2490 caec->exists = GNUNET_YES;
2499 * Iterator to free entries in the validation_map.
2501 * @param cls closure (unused)
2502 * @param key current key code
2503 * @param value value in the hash map (validation to abort)
2504 * @return GNUNET_YES (always)
2507 abort_validation (void *cls,
2508 const GNUNET_HashCode * key,
2511 struct ValidationEntry *va = value;
2513 if (GNUNET_SCHEDULER_NO_TASK != va->timeout_task)
2514 GNUNET_SCHEDULER_cancel (va->timeout_task);
2515 GNUNET_free (va->transport_name);
2516 if (va->chvc != NULL)
2518 va->chvc->ve_count--;
2519 if (va->chvc->ve_count == 0)
2521 GNUNET_CONTAINER_DLL_remove (chvc_head,
2524 GNUNET_free (va->chvc);
2534 * HELLO validation cleanup task (validation failed).
2536 * @param cls the 'struct ValidationEntry' that failed
2537 * @param tc scheduler context (unused)
2540 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2542 struct ValidationEntry *va = cls;
2543 struct GNUNET_PeerIdentity pid;
2545 va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2546 GNUNET_STATISTICS_update (stats,
2547 gettext_noop ("# address validation timeouts"),
2550 GNUNET_CRYPTO_hash (&va->publicKey,
2552 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2554 GNUNET_break (GNUNET_OK ==
2555 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2558 abort_validation (NULL, NULL, va);
2563 neighbour_timeout_task (void *cls,
2564 const struct GNUNET_SCHEDULER_TaskContext *tc)
2566 struct NeighbourList *n = cls;
2569 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2570 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2572 GNUNET_STATISTICS_update (stats,
2573 gettext_noop ("# disconnects due to timeout"),
2576 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2577 disconnect_neighbour (n, GNUNET_NO);
2582 * Schedule the job that will cause us to send a PING to the
2583 * foreign address to evaluate its validity and latency.
2585 * @param fal address to PING
2588 schedule_next_ping (struct ForeignAddressList *fal);
2592 * Add the given address to the list of foreign addresses
2593 * available for the given peer (check for duplicates).
2595 * @param cls the respective 'struct NeighbourList' to update
2596 * @param tname name of the transport
2597 * @param expiration expiration time
2598 * @param addr the address
2599 * @param addrlen length of the address
2600 * @return GNUNET_OK (always)
2603 add_to_foreign_address_list (void *cls,
2605 struct GNUNET_TIME_Absolute expiration,
2609 struct NeighbourList *n = cls;
2610 struct ForeignAddressList *fal;
2613 GNUNET_STATISTICS_update (stats,
2614 gettext_noop ("# valid peer addresses returned by PEERINFO"),
2618 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2621 #if DEBUG_TRANSPORT_HELLO
2622 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2623 "Adding address `%s' (%s) for peer `%4s' due to PEERINFO data for %llums.\n",
2624 a2s (tname, addr, addrlen),
2626 GNUNET_i2s (&n->id),
2627 expiration.abs_value);
2629 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2632 GNUNET_STATISTICS_update (stats,
2633 gettext_noop ("# previously validated addresses lacking transport"),
2639 fal->expires = GNUNET_TIME_absolute_max (expiration,
2641 schedule_next_ping (fal);
2647 fal->expires = GNUNET_TIME_absolute_max (expiration,
2652 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2653 "Failed to add new address for `%4s'\n",
2654 GNUNET_i2s (&n->id));
2657 if (fal->validated == GNUNET_NO)
2659 fal->validated = GNUNET_YES;
2660 GNUNET_STATISTICS_update (stats,
2661 gettext_noop ("# peer addresses considered valid"),
2665 if (try == GNUNET_YES)
2667 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2668 "Have new addresses, will try to trigger transmissions.\n");
2669 try_transmission_to_peer (n);
2676 * Add addresses in validated HELLO "h" to the set of addresses
2677 * we have for this peer.
2679 * @param cls closure ('struct NeighbourList*')
2680 * @param peer id of the peer, NULL for last call
2681 * @param h hello message for the peer (can be NULL)
2684 add_hello_for_peer (void *cls,
2685 const struct GNUNET_PeerIdentity *peer,
2686 const struct GNUNET_HELLO_Message *h)
2688 struct NeighbourList *n = cls;
2692 GNUNET_STATISTICS_update (stats,
2693 gettext_noop ("# outstanding peerinfo iterate requests"),
2700 return; /* no HELLO available */
2702 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2703 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2707 if (GNUNET_YES != n->public_key_valid)
2709 GNUNET_HELLO_get_key (h, &n->publicKey);
2710 n->public_key_valid = GNUNET_YES;
2712 GNUNET_HELLO_iterate_addresses (h,
2714 &add_to_foreign_address_list,
2720 * Create a fresh entry in our neighbour list for the given peer.
2721 * Will try to transmit our current HELLO to the new neighbour.
2722 * Do not call this function directly, use 'setup_peer_check_blacklist.
2724 * @param peer the peer for which we create the entry
2725 * @param do_hello should we schedule transmitting a HELLO
2726 * @return the new neighbour list entry
2728 static struct NeighbourList *
2729 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2732 struct NeighbourList *n;
2733 struct TransportPlugin *tp;
2734 struct ReadyList *rl;
2737 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2738 "Setting up state for neighbour `%4s'\n",
2741 GNUNET_assert (our_hello != NULL);
2742 GNUNET_STATISTICS_update (stats,
2743 gettext_noop ("# active neighbours"),
2746 n = GNUNET_malloc (sizeof (struct NeighbourList));
2747 n->next = neighbours;
2751 GNUNET_TIME_relative_to_absolute
2752 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2753 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2754 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2755 MAX_BANDWIDTH_CARRY_S);
2759 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2761 rl = GNUNET_malloc (sizeof (struct ReadyList));
2763 rl->next = n->plugins;
2766 rl->addresses = NULL;
2770 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2772 n->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2773 &neighbour_timeout_task, n);
2776 GNUNET_STATISTICS_update (stats,
2777 gettext_noop ("# peerinfo new neighbor iterate requests"),
2780 GNUNET_STATISTICS_update (stats,
2781 gettext_noop ("# outstanding peerinfo iterate requests"),
2784 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2785 GNUNET_TIME_UNIT_FOREVER_REL,
2786 &add_hello_for_peer, n);
2788 GNUNET_STATISTICS_update (stats,
2789 gettext_noop ("# HELLO's sent to new neighbors"),
2792 transmit_to_peer (NULL, NULL, 0,
2793 HELLO_ADDRESS_EXPIRATION,
2794 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2802 * Function called after we have checked if communicating
2803 * with a given peer is acceptable.
2805 * @param cls closure
2806 * @param n NULL if communication is not acceptable
2808 typedef void (*SetupContinuation)(void *cls,
2809 struct NeighbourList *n);
2813 * Information kept for each client registered to perform
2819 * This is a linked list.
2821 struct Blacklisters *next;
2824 * This is a linked list.
2826 struct Blacklisters *prev;
2829 * Client responsible for this entry.
2831 struct GNUNET_SERVER_Client *client;
2834 * Blacklist check that we're currently performing.
2836 struct BlacklistCheck *bc;
2842 * Head of DLL of blacklisting clients.
2844 static struct Blacklisters *bl_head;
2847 * Tail of DLL of blacklisting clients.
2849 static struct Blacklisters *bl_tail;
2853 * Context we use when performing a blacklist check.
2855 struct BlacklistCheck
2859 * This is a linked list.
2861 struct BlacklistCheck *next;
2864 * This is a linked list.
2866 struct BlacklistCheck *prev;
2869 * Peer being checked.
2871 struct GNUNET_PeerIdentity peer;
2874 * Option for setup neighbour afterwards.
2879 * Continuation to call with the result.
2881 SetupContinuation cont;
2889 * Current transmission request handle for this client, or NULL if no
2890 * request is pending.
2892 struct GNUNET_CONNECTION_TransmitHandle *th;
2895 * Our current position in the blacklisters list.
2897 struct Blacklisters *bl_pos;
2900 * Current task performing the check.
2902 GNUNET_SCHEDULER_TaskIdentifier task;
2907 * Head of DLL of active blacklisting queries.
2909 static struct BlacklistCheck *bc_head;
2912 * Tail of DLL of active blacklisting queries.
2914 static struct BlacklistCheck *bc_tail;
2918 * Perform next action in the blacklist check.
2920 * @param cls the 'struct BlacklistCheck*'
2924 do_blacklist_check (void *cls,
2925 const struct GNUNET_SCHEDULER_TaskContext *tc);
2929 * Transmit blacklist query to the client.
2931 * @param cls the 'struct BlacklistCheck'
2932 * @param size number of bytes allowed
2933 * @param buf where to copy the message
2934 * @return number of bytes copied to buf
2937 transmit_blacklist_message (void *cls,
2941 struct BlacklistCheck *bc = cls;
2942 struct Blacklisters *bl;
2943 struct BlacklistMessage bm;
2948 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2949 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
2954 bm.header.size = htons (sizeof (struct BlacklistMessage));
2955 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2956 bm.is_allowed = htonl (0);
2958 memcpy (buf, &bm, sizeof (bm));
2959 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2965 * Perform next action in the blacklist check.
2967 * @param cls the 'struct BlacklistCheck*'
2971 do_blacklist_check (void *cls,
2972 const struct GNUNET_SCHEDULER_TaskContext *tc)
2974 struct BlacklistCheck *bc = cls;
2975 struct Blacklisters *bl;
2977 bc->task = GNUNET_SCHEDULER_NO_TASK;
2981 bc->cont (bc->cont_cls,
2982 setup_new_neighbour (&bc->peer, bc->do_hello));
2989 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
2990 sizeof (struct BlacklistMessage),
2991 GNUNET_TIME_UNIT_FOREVER_REL,
2992 &transmit_blacklist_message,
2999 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
3000 * does not yet exist, check the blacklist. If the blacklist says creating
3001 * one is acceptable, create one and call the continuation; otherwise
3002 * call the continuation with NULL.
3004 * @param peer peer to setup or look up a struct NeighbourList for
3005 * @param do_hello should we also schedule sending our HELLO to the peer
3006 * if this is a new record
3007 * @param cont function to call with the 'struct NeigbhbourList*'
3008 * @param cont_cls closure for cont
3011 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
3013 SetupContinuation cont,
3016 struct NeighbourList *n;
3017 struct BlacklistCheck *bc;
3019 n = find_neighbour(peer);
3026 if (bl_head == NULL)
3029 cont (cont_cls, setup_new_neighbour (peer, do_hello));
3031 setup_new_neighbour(peer, do_hello);
3034 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3035 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3037 bc->do_hello = do_hello;
3039 bc->cont_cls = cont_cls;
3040 bc->bl_pos = bl_head;
3041 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3047 * Function called with the result of querying a new blacklister about
3048 * it being allowed (or not) to continue to talk to an existing neighbour.
3050 * @param cls the original 'struct NeighbourList'
3051 * @param n NULL if we need to disconnect
3054 confirm_or_drop_neighbour (void *cls,
3055 struct NeighbourList *n)
3057 struct NeighbourList * orig = cls;
3061 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3062 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&orig->id),
3063 "confirm_or_drop_neighboUr");
3064 disconnect_neighbour (orig, GNUNET_NO);
3070 * Handle a request to start a blacklist.
3072 * @param cls closure (always NULL)
3073 * @param client identification of the client
3074 * @param message the actual message
3077 handle_blacklist_init (void *cls,
3078 struct GNUNET_SERVER_Client *client,
3079 const struct GNUNET_MessageHeader *message)
3081 struct Blacklisters *bl;
3082 struct BlacklistCheck *bc;
3083 struct NeighbourList *n;
3088 if (bl->client == client)
3091 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3096 bl = GNUNET_malloc (sizeof (struct Blacklisters));
3097 bl->client = client;
3098 GNUNET_SERVER_client_keep (client);
3099 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
3100 /* confirm that all existing connections are OK! */
3104 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3105 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3107 bc->do_hello = GNUNET_NO;
3108 bc->cont = &confirm_or_drop_neighbour;
3111 if (n == neighbours) /* all would wait for the same client, no need to
3112 create more than just the first task right now */
3113 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3121 * Handle a request to blacklist a peer.
3123 * @param cls closure (always NULL)
3124 * @param client identification of the client
3125 * @param message the actual message
3128 handle_blacklist_reply (void *cls,
3129 struct GNUNET_SERVER_Client *client,
3130 const struct GNUNET_MessageHeader *message)
3132 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
3133 struct Blacklisters *bl;
3134 struct BlacklistCheck *bc;
3137 while ( (bl != NULL) &&
3138 (bl->client != client) )
3142 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3147 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
3149 bc->cont (bc->cont_cls, NULL);
3150 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
3155 bc->bl_pos = bc->bl_pos->next;
3156 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3159 /* check if any other bc's are waiting for this blacklister */
3163 if ( (bc->bl_pos == bl) &&
3164 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
3165 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3173 * Send periodic PING messages to a given foreign address.
3175 * @param cls our 'struct PeriodicValidationContext*'
3176 * @param tc task context
3179 send_periodic_ping (void *cls,
3180 const struct GNUNET_SCHEDULER_TaskContext *tc)
3182 struct ForeignAddressList *peer_address = cls;
3183 struct TransportPlugin *tp;
3184 struct ValidationEntry *va;
3185 struct NeighbourList *neighbour;
3186 struct TransportPingMessage ping;
3187 struct CheckAddressExistsClosure caec;
3189 uint16_t hello_size;
3193 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3194 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3196 tp = peer_address->ready_list->plugin;
3197 neighbour = peer_address->ready_list->neighbour;
3198 if (GNUNET_YES != neighbour->public_key_valid)
3200 /* no public key yet, try again later */
3201 schedule_next_ping (peer_address);
3204 caec.addr = peer_address->addr;
3205 caec.addrlen = peer_address->addrlen;
3206 caec.tname = tp->short_name;
3207 caec.session = peer_address->session;
3208 caec.exists = GNUNET_NO;
3209 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3210 &check_address_exists,
3212 if (caec.exists == GNUNET_YES)
3214 /* During validation attempts we will likely trigger the other
3215 peer trying to validate our address which in turn will cause
3216 it to send us its HELLO, so we expect to hit this case rather
3217 frequently. Only print something if we are very verbose. */
3218 #if DEBUG_TRANSPORT > 1
3219 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3220 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3221 (peer_address->addr != NULL)
3222 ? a2s (tp->short_name,
3224 peer_address->addrlen)
3227 GNUNET_i2s (&neighbour->id));
3229 schedule_next_ping (peer_address);
3232 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3233 va->transport_name = GNUNET_strdup (tp->short_name);
3234 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
3236 va->send_time = GNUNET_TIME_absolute_get();
3237 va->session = peer_address->session;
3238 if (peer_address->addr != NULL)
3240 va->addr = (const void*) &va[1];
3241 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3242 va->addrlen = peer_address->addrlen;
3244 memcpy(&va->publicKey,
3245 &neighbour->publicKey,
3246 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3248 va->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_VERIFICATION_TIMEOUT,
3249 &timeout_hello_validation,
3251 GNUNET_CONTAINER_multihashmap_put (validation_map,
3252 &neighbour->id.hashPubKey,
3254 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3256 if (peer_address->validated != GNUNET_YES)
3257 hello_size = GNUNET_HELLO_size(our_hello);
3261 tsize = sizeof(struct TransportPingMessage) + hello_size;
3263 if (peer_address->addr != NULL)
3265 slen = strlen (tp->short_name) + 1;
3266 tsize += slen + peer_address->addrlen;
3270 slen = 0; /* make gcc happy */
3272 message_buf = GNUNET_malloc(tsize);
3273 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3274 ping.challenge = htonl(va->challenge);
3275 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3276 if (peer_address->validated != GNUNET_YES)
3278 memcpy(message_buf, our_hello, hello_size);
3281 if (peer_address->addr != NULL)
3283 ping.header.size = htons(sizeof(struct TransportPingMessage) +
3284 peer_address->addrlen +
3286 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3289 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3291 peer_address->addrlen);
3295 ping.header.size = htons(sizeof(struct TransportPingMessage));
3298 memcpy(&message_buf[hello_size],
3300 sizeof(struct TransportPingMessage));
3302 #if DEBUG_TRANSPORT_REVALIDATION
3303 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3304 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s'\n",
3305 (peer_address->addr != NULL)
3306 ? a2s (peer_address->plugin->short_name,
3308 peer_address->addrlen)
3311 GNUNET_i2s (&neighbour->id),
3312 "HELLO", hello_size,
3315 if (peer_address->validated != GNUNET_YES)
3316 GNUNET_STATISTICS_update (stats,
3317 gettext_noop ("# PING with HELLO messages sent"),
3321 GNUNET_STATISTICS_update (stats,
3322 gettext_noop ("# PING without HELLO messages sent"),
3325 GNUNET_STATISTICS_update (stats,
3326 gettext_noop ("# PING messages sent for re-validation"),
3329 transmit_to_peer (NULL, peer_address,
3330 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3331 HELLO_VERIFICATION_TIMEOUT,
3333 GNUNET_YES, neighbour);
3334 GNUNET_free(message_buf);
3335 schedule_next_ping (peer_address);
3340 * Schedule the job that will cause us to send a PING to the
3341 * foreign address to evaluate its validity and latency.
3343 * @param fal address to PING
3346 schedule_next_ping (struct ForeignAddressList *fal)
3348 struct GNUNET_TIME_Relative delay;
3350 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3352 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3353 delay.rel_value /= 2; /* do before expiration */
3354 delay = GNUNET_TIME_relative_min (delay,
3355 LATENCY_EVALUATION_MAX_DELAY);
3356 if (GNUNET_YES != fal->estimated)
3358 delay = GNUNET_TIME_UNIT_ZERO;
3359 fal->estimated = GNUNET_YES;
3361 if (GNUNET_YES == fal->connected)
3363 delay = GNUNET_TIME_relative_min (delay,
3364 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3366 /* FIXME: also adjust delay based on how close the last
3367 observed latency is to the latency of the best alternative */
3368 /* bound how fast we can go */
3369 delay = GNUNET_TIME_relative_max (delay,
3370 GNUNET_TIME_UNIT_SECONDS);
3371 /* randomize a bit (to avoid doing all at the same time) */
3372 delay.rel_value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3373 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(delay,
3374 &send_periodic_ping,
3382 * Function that will be called if we receive some payload
3383 * from another peer.
3385 * @param message the payload
3386 * @param n peer who claimed to be the sender
3389 handle_payload_message (const struct GNUNET_MessageHeader *message,
3390 struct NeighbourList *n)
3392 struct InboundMessage *im;
3393 struct TransportClient *cpos;
3396 msize = ntohs (message->size);
3397 if (n->received_pong == GNUNET_NO)
3399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3400 "Received message of type %u and size %u from `%4s', but no pong yet!!\n",
3401 ntohs (message->type),
3402 ntohs (message->size),
3403 GNUNET_i2s (&n->id));
3404 GNUNET_free_non_null (n->pre_connect_message_buffer);
3405 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3406 memcpy (n->pre_connect_message_buffer, message, msize);
3411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3412 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
3413 ntohs (message->type),
3414 ntohs (message->size),
3415 GNUNET_i2s (&n->id));
3417 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3420 n->quota_violation_count++;
3422 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3423 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3424 n->in_tracker.available_bytes_per_s__,
3425 n->quota_violation_count);
3427 /* Discount 32k per violation */
3428 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3433 if (n->quota_violation_count > 0)
3435 /* try to add 32k back */
3436 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3438 n->quota_violation_count--;
3441 GNUNET_STATISTICS_update (stats,
3442 gettext_noop ("# payload received from other peers"),
3445 /* transmit message to all clients */
3446 uint32_t ats_count = 2;
3447 uint16_t size = sizeof (struct InboundMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information) + msize;
3449 im = GNUNET_malloc (size);
3450 im->header.size = htons (size);
3451 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3453 im->ats_count = htonl(ats_count);
3454 /* Setting ATS data */
3455 (&(im->ats))[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
3456 (&(im->ats))[0].value = htonl (n->distance);
3457 (&(im->ats))[1].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY);
3458 (&(im->ats))[1].value = htonl ((uint32_t) n->latency.rel_value);
3459 (&(im->ats))[ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3460 (&(im->ats))[ats_count].value = htonl (0);
3462 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;
3683 handle_payload_message (prem, n);
3687 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3689 GNUNET_SCHEDULER_cancel (n->retry_task);
3690 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3691 try_transmission_to_peer (n);
3695 /* clean up validation entry */
3696 GNUNET_assert (GNUNET_YES ==
3697 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3700 abort_validation (NULL, NULL, ve);
3706 * Function that will be called if we receive a validation
3707 * of an address challenge that we transmitted to another
3708 * peer. Note that the validation should only be considered
3709 * acceptable if the challenge matches AND if the sender
3710 * address is at least a plausible address for this peer
3711 * (otherwise we may be seeing a MiM attack).
3713 * @param cls closure
3714 * @param message the pong message
3715 * @param peer who responded to our challenge
3716 * @param sender_address string describing our sender address (as observed
3717 * by the other peer in binary format)
3718 * @param sender_address_len number of bytes in 'sender_address'
3721 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3722 const struct GNUNET_PeerIdentity *peer,
3723 const char *sender_address,
3724 size_t sender_address_len)
3726 #if DEBUG_TRANSPORT > 1
3727 /* we get tons of these that just get discarded, only log
3728 if we are quite verbose */
3729 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3730 "Receiving `%s' message from `%4s'.\n", "PONG",
3733 GNUNET_STATISTICS_update (stats,
3734 gettext_noop ("# PONG messages received"),
3737 if (GNUNET_SYSERR !=
3738 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3740 &check_pending_validation,
3743 /* This is *expected* to happen a lot since we send
3744 PONGs to *all* known addresses of the sender of
3745 the PING, so most likely we get multiple PONGs
3746 per PING, and all but the first PONG will end up
3747 here. So really we should not print anything here
3748 unless we want to be very, very verbose... */
3749 #if DEBUG_TRANSPORT > 2
3750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3751 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3763 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3765 * @param cls the 'struct ValidationEntry*'
3766 * @param neighbour neighbour to validate, NULL if validation failed
3769 transmit_hello_and_ping (void *cls,
3770 struct NeighbourList *neighbour)
3772 struct ValidationEntry *va = cls;
3773 struct ForeignAddressList *peer_address;
3774 struct TransportPingMessage ping;
3775 uint16_t hello_size;
3778 struct GNUNET_PeerIdentity id;
3781 GNUNET_CRYPTO_hash (&va->publicKey,
3782 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3784 if (neighbour == NULL)
3786 /* FIXME: stats... */
3787 GNUNET_break (GNUNET_OK ==
3788 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3791 abort_validation (NULL, NULL, va);
3794 neighbour->publicKey = va->publicKey;
3795 neighbour->public_key_valid = GNUNET_YES;
3796 peer_address = add_peer_address (neighbour,
3797 va->transport_name, NULL,
3798 (const void*) &va[1],
3800 if (peer_address == NULL)
3802 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3803 "Failed to add peer `%4s' for plugin `%s'\n",
3804 GNUNET_i2s (&neighbour->id),
3805 va->transport_name);
3806 GNUNET_break (GNUNET_OK ==
3807 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3810 abort_validation (NULL, NULL, va);
3813 hello_size = GNUNET_HELLO_size(our_hello);
3814 slen = strlen(va->transport_name) + 1;
3815 tsize = sizeof(struct TransportPingMessage) + hello_size + va->addrlen + slen;
3816 message_buf = GNUNET_malloc(tsize);
3817 ping.challenge = htonl(va->challenge);
3818 ping.header.size = htons(sizeof(struct TransportPingMessage) + slen + va->addrlen);
3819 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3820 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3821 memcpy(message_buf, our_hello, hello_size);
3822 memcpy(&message_buf[hello_size],
3824 sizeof(struct TransportPingMessage));
3825 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3828 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3832 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3833 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3836 : a2s (va->transport_name,
3837 (const void*) &va[1], va->addrlen),
3839 GNUNET_i2s (&neighbour->id),
3840 "HELLO", hello_size,
3841 "PING", sizeof (struct TransportPingMessage) + va->addrlen + slen);
3844 GNUNET_STATISTICS_update (stats,
3845 gettext_noop ("# PING messages sent for initial validation"),
3848 transmit_to_peer (NULL, peer_address,
3849 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3850 HELLO_VERIFICATION_TIMEOUT,
3852 GNUNET_YES, neighbour);
3853 GNUNET_free(message_buf);
3858 * Check if the given address is already being validated; if not,
3859 * append the given address to the list of entries that are being be
3860 * validated and initiate validation.
3862 * @param cls closure ('struct CheckHelloValidatedContext *')
3863 * @param tname name of the transport
3864 * @param expiration expiration time
3865 * @param addr the address
3866 * @param addrlen length of the address
3867 * @return GNUNET_OK (always)
3870 run_validation (void *cls,
3872 struct GNUNET_TIME_Absolute expiration,
3876 struct CheckHelloValidatedContext *chvc = cls;
3877 struct GNUNET_PeerIdentity id;
3878 struct TransportPlugin *tp;
3879 struct ValidationEntry *va;
3880 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3881 struct CheckAddressExistsClosure caec;
3882 struct OwnAddressList *oal;
3884 GNUNET_assert (addr != NULL);
3886 GNUNET_STATISTICS_update (stats,
3887 gettext_noop ("# peer addresses scheduled for validation"),
3890 tp = find_transport (tname);
3893 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3894 GNUNET_ERROR_TYPE_BULK,
3896 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3898 GNUNET_STATISTICS_update (stats,
3899 gettext_noop ("# peer addresses not validated (plugin not available)"),
3904 /* check if this is one of our own addresses */
3905 oal = tp->addresses;
3908 if ( (oal->addrlen == addrlen) &&
3909 (0 == memcmp (&oal[1],
3913 /* not plausible, this address is equivalent to our own address! */
3914 GNUNET_STATISTICS_update (stats,
3915 gettext_noop ("# peer addresses not validated (loopback)"),
3922 GNUNET_HELLO_get_key (chvc->hello, &pk);
3923 GNUNET_CRYPTO_hash (&pk,
3925 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3928 if (is_blacklisted(&id, tp))
3931 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3932 "Attempted to validate blacklisted peer `%s' using `%s'!\n",
3940 caec.addrlen = addrlen;
3941 caec.session = NULL;
3943 caec.exists = GNUNET_NO;
3944 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3945 &check_address_exists,
3947 if (caec.exists == GNUNET_YES)
3949 /* During validation attempts we will likely trigger the other
3950 peer trying to validate our address which in turn will cause
3951 it to send us its HELLO, so we expect to hit this case rather
3952 frequently. Only print something if we are very verbose. */
3953 #if DEBUG_TRANSPORT > 1
3954 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3955 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3956 a2s (tname, addr, addrlen),
3960 GNUNET_STATISTICS_update (stats,
3961 gettext_noop ("# peer addresses not validated (in progress)"),
3966 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
3969 va->transport_name = GNUNET_strdup (tname);
3970 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
3972 va->send_time = GNUNET_TIME_absolute_get();
3973 va->addr = (const void*) &va[1];
3974 memcpy (&va[1], addr, addrlen);
3975 va->addrlen = addrlen;
3976 GNUNET_HELLO_get_key (chvc->hello,
3978 va->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_VERIFICATION_TIMEOUT,
3979 &timeout_hello_validation,
3981 GNUNET_CONTAINER_multihashmap_put (validation_map,
3984 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3985 setup_peer_check_blacklist (&id, GNUNET_NO,
3986 &transmit_hello_and_ping,
3993 * Check if addresses in validated hello "h" overlap with
3994 * those in "chvc->hello" and validate the rest.
3996 * @param cls closure
3997 * @param peer id of the peer, NULL for last call
3998 * @param h hello message for the peer (can be NULL)
4001 check_hello_validated (void *cls,
4002 const struct GNUNET_PeerIdentity *peer,
4003 const struct GNUNET_HELLO_Message *h)
4005 struct CheckHelloValidatedContext *chvc = cls;
4006 struct GNUNET_HELLO_Message *plain_hello;
4007 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
4008 struct GNUNET_PeerIdentity target;
4009 struct NeighbourList *n;
4013 GNUNET_STATISTICS_update (stats,
4014 gettext_noop ("# outstanding peerinfo iterate requests"),
4018 if (GNUNET_NO == chvc->hello_known)
4020 /* notify PEERINFO about the peer now, so that we at least
4021 have the public key if some other component needs it */
4022 GNUNET_HELLO_get_key (chvc->hello, &pk);
4023 GNUNET_CRYPTO_hash (&pk,
4024 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4025 &target.hashPubKey);
4026 plain_hello = GNUNET_HELLO_create (&pk,
4029 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
4030 GNUNET_free (plain_hello);
4031 #if DEBUG_TRANSPORT_HELLO
4032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4033 "PEERINFO had no `%s' message for peer `%4s', full validation needed.\n",
4035 GNUNET_i2s (&target));
4037 GNUNET_STATISTICS_update (stats,
4038 gettext_noop ("# new HELLOs requiring full validation"),
4041 GNUNET_HELLO_iterate_addresses (chvc->hello,
4048 GNUNET_STATISTICS_update (stats,
4049 gettext_noop ("# duplicate HELLO (peer known)"),
4054 if (chvc->ve_count == 0)
4056 GNUNET_CONTAINER_DLL_remove (chvc_head,
4065 #if DEBUG_TRANSPORT_HELLO
4066 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4067 "PEERINFO had `%s' message for peer `%4s', validating only new addresses.\n",
4071 chvc->hello_known = GNUNET_YES;
4072 n = find_neighbour (peer);
4075 #if DEBUG_TRANSPORT_HELLO
4076 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4077 "Calling hello_iterate_addresses for %s!\n",
4080 GNUNET_HELLO_iterate_addresses (h,
4082 &add_to_foreign_address_list,
4084 try_transmission_to_peer (n);
4088 #if DEBUG_TRANSPORT_HELLO
4089 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4090 "No existing neighbor record for %s!\n",
4093 GNUNET_STATISTICS_update (stats,
4094 gettext_noop ("# no existing neighbour record (validating HELLO)"),
4098 GNUNET_STATISTICS_update (stats,
4099 gettext_noop ("# HELLO validations (update case)"),
4102 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
4104 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
4111 * Process HELLO-message.
4113 * @param plugin transport involved, may be NULL
4114 * @param message the actual message
4115 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
4118 process_hello (struct TransportPlugin *plugin,
4119 const struct GNUNET_MessageHeader *message)
4122 struct GNUNET_PeerIdentity target;
4123 const struct GNUNET_HELLO_Message *hello;
4124 struct CheckHelloValidatedContext *chvc;
4125 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
4126 #if DEBUG_TRANSPORT_HELLO > 2
4129 hsize = ntohs (message->size);
4130 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
4131 (hsize < sizeof (struct GNUNET_MessageHeader)))
4134 return GNUNET_SYSERR;
4136 GNUNET_STATISTICS_update (stats,
4137 gettext_noop ("# HELLOs received for validation"),
4141 /* first, check if load is too high */
4142 if (GNUNET_SCHEDULER_get_load (GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
4144 GNUNET_STATISTICS_update (stats,
4145 gettext_noop ("# HELLOs ignored due to high load"),
4148 #if DEBUG_TRANSPORT_HELLO
4149 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4150 "Ignoring `%s' for `%4s', load too high.\n",
4152 GNUNET_i2s (&target));
4156 hello = (const struct GNUNET_HELLO_Message *) message;
4157 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
4159 #if DEBUG_TRANSPORT_HELLO
4160 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4161 "Unable to get public key from `%s' for `%4s'!\n",
4163 GNUNET_i2s (&target));
4165 GNUNET_break_op (0);
4166 return GNUNET_SYSERR;
4169 GNUNET_CRYPTO_hash (&publicKey,
4170 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4171 &target.hashPubKey);
4173 #if DEBUG_TRANSPORT_HELLO
4174 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4175 "Received `%s' message for `%4s'\n",
4177 GNUNET_i2s (&target));
4180 if (0 == memcmp (&my_identity,
4182 sizeof (struct GNUNET_PeerIdentity)))
4184 GNUNET_STATISTICS_update (stats,
4185 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
4191 while (NULL != chvc)
4193 if (GNUNET_HELLO_equals (hello,
4195 GNUNET_TIME_absolute_get ()).abs_value > 0)
4197 #if DEBUG_TRANSPORT_HELLO > 2
4198 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4199 "Received duplicate `%s' message for `%4s'; ignored\n",
4201 GNUNET_i2s (&target));
4203 return GNUNET_OK; /* validation already pending */
4205 if (GNUNET_HELLO_size(hello) == GNUNET_HELLO_size (chvc->hello))
4206 GNUNET_break (0 != memcmp (hello, chvc->hello,
4207 GNUNET_HELLO_size(hello)));
4212 struct NeighbourList *temp_neighbor = find_neighbour(&target);
4213 if ((NULL != temp_neighbor))
4215 fprintf(stderr, "Already know peer, ignoring hello\n");
4220 #if DEBUG_TRANSPORT_HELLO > 2
4223 my_id = GNUNET_strdup(GNUNET_i2s(plugin->env.my_identity));
4224 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4225 "%s: Starting validation of `%s' message for `%4s' via '%s' of size %u\n",
4228 GNUNET_i2s (&target),
4230 GNUNET_HELLO_size(hello));
4234 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
4236 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
4237 memcpy (&chvc[1], hello, hsize);
4238 GNUNET_CONTAINER_DLL_insert (chvc_head,
4241 /* finally, check if HELLO was previously validated
4242 (continuation will then schedule actual validation) */
4243 GNUNET_STATISTICS_update (stats,
4244 gettext_noop ("# peerinfo process hello iterate requests"),
4247 GNUNET_STATISTICS_update (stats,
4248 gettext_noop ("# outstanding peerinfo iterate requests"),
4251 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
4253 HELLO_VERIFICATION_TIMEOUT,
4254 &check_hello_validated, chvc);
4260 * The peer specified by the given neighbour has timed-out or a plugin
4261 * has disconnected. We may either need to do nothing (other plugins
4262 * still up), or trigger a full disconnect and clean up. This
4263 * function updates our state and does the necessary notifications.
4264 * Also notifies our clients that the neighbour is now officially
4267 * @param n the neighbour list entry for the peer
4268 * @param check GNUNET_YES to check if ALL addresses for this peer
4269 * are gone, GNUNET_NO to force a disconnect of the peer
4270 * regardless of whether other addresses exist.
4273 disconnect_neighbour (struct NeighbourList *n, int check)
4275 struct ReadyList *rpos;
4276 struct NeighbourList *npos;
4277 struct NeighbourList *nprev;
4278 struct MessageQueue *mq;
4279 struct ForeignAddressList *peer_addresses;
4280 struct ForeignAddressList *peer_pos;
4282 if (GNUNET_YES == check)
4285 while (NULL != rpos)
4287 peer_addresses = rpos->addresses;
4288 while (peer_addresses != NULL)
4290 if (GNUNET_YES == peer_addresses->connected)
4292 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4293 "NOT Disconnecting from `%4s', still have live addresses!\n",
4294 GNUNET_i2s (&n->id));
4295 return; /* still connected */
4297 peer_addresses = peer_addresses->next;
4303 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4304 "Disconnecting from `%4s'\n",
4305 GNUNET_i2s (&n->id));
4307 /* remove n from neighbours list */
4310 while ((npos != NULL) && (npos != n))
4315 GNUNET_assert (npos != NULL);
4317 neighbours = n->next;
4319 nprev->next = n->next;
4321 /* notify all clients about disconnect */
4322 if (GNUNET_YES == n->received_pong)
4323 notify_clients_disconnect (&n->id);
4325 /* clean up all plugins, cancel connections and pending transmissions */
4326 while (NULL != (rpos = n->plugins))
4328 n->plugins = rpos->next;
4329 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
4330 while (rpos->addresses != NULL)
4332 peer_pos = rpos->addresses;
4333 rpos->addresses = peer_pos->next;
4334 if (peer_pos->connected == GNUNET_YES)
4335 GNUNET_STATISTICS_update (stats,
4336 gettext_noop ("# connected addresses"),
4339 if (GNUNET_YES == peer_pos->validated)
4340 GNUNET_STATISTICS_update (stats,
4341 gettext_noop ("# peer addresses considered valid"),
4344 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
4346 GNUNET_SCHEDULER_cancel (peer_pos->revalidate_task);
4347 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
4349 GNUNET_free(peer_pos);
4354 /* free all messages on the queue */
4355 while (NULL != (mq = n->messages_head))
4357 GNUNET_STATISTICS_update (stats,
4358 gettext_noop ("# bytes in message queue for other peers"),
4359 - (int64_t) mq->message_buf_size,
4361 GNUNET_STATISTICS_update (stats,
4362 gettext_noop ("# bytes discarded due to disconnect"),
4363 mq->message_buf_size,
4365 GNUNET_CONTAINER_DLL_remove (n->messages_head,
4368 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
4370 sizeof(struct GNUNET_PeerIdentity)));
4373 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
4375 GNUNET_SCHEDULER_cancel (n->timeout_task);
4376 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
4378 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
4380 GNUNET_SCHEDULER_cancel (n->retry_task);
4381 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
4383 if (n->piter != NULL)
4385 GNUNET_PEERINFO_iterate_cancel (n->piter);
4386 GNUNET_STATISTICS_update (stats,
4387 gettext_noop ("# outstanding peerinfo iterate requests"),
4392 /* finally, free n itself */
4393 GNUNET_STATISTICS_update (stats,
4394 gettext_noop ("# active neighbours"),
4397 GNUNET_free_non_null (n->pre_connect_message_buffer);
4403 * We have received a PING message from someone. Need to send a PONG message
4404 * in response to the peer by any means necessary.
4407 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
4408 const struct GNUNET_PeerIdentity *peer,
4409 struct Session *session,
4410 const char *sender_address,
4411 uint16_t sender_address_len)
4413 struct TransportPlugin *plugin = cls;
4414 struct SessionHeader *session_header = (struct SessionHeader*) session;
4415 struct TransportPingMessage *ping;
4416 struct TransportPongMessage *pong;
4417 struct NeighbourList *n;
4418 struct ReadyList *rl;
4419 struct ForeignAddressList *fal;
4420 struct OwnAddressList *oal;
4425 if (ntohs (message->size) < sizeof (struct TransportPingMessage))
4427 GNUNET_break_op (0);
4428 return GNUNET_SYSERR;
4431 ping = (struct TransportPingMessage *) message;
4432 if (0 != memcmp (&ping->target,
4433 plugin->env.my_identity,
4434 sizeof (struct GNUNET_PeerIdentity)))
4436 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4437 _("Received `%s' message from `%s' destined for `%s' which is not me!\n"),
4439 (sender_address != NULL)
4440 ? a2s (plugin->short_name,
4441 (const struct sockaddr *)sender_address,
4444 GNUNET_i2s (&ping->target));
4445 return GNUNET_SYSERR;
4448 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4449 "Processing `%s' from `%s'\n",
4451 (sender_address != NULL)
4452 ? a2s (plugin->short_name,
4453 (const struct sockaddr *)sender_address,
4457 GNUNET_STATISTICS_update (stats,
4458 gettext_noop ("# PING messages received"),
4461 addr = (const char*) &ping[1];
4462 alen = ntohs (message->size) - sizeof (struct TransportPingMessage);
4463 slen = strlen (plugin->short_name) + 1;
4466 /* peer wants to confirm that we have an outbound connection to him */
4467 if (session == NULL)
4469 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4470 _("Refusing to create PONG since I do not have a session with `%s'.\n"),
4472 return GNUNET_SYSERR;
4474 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4475 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4476 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4477 pong->purpose.size =
4478 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4480 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4481 sizeof (struct GNUNET_PeerIdentity) + sender_address_len + slen);
4482 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING);
4483 pong->challenge = ping->challenge;
4484 pong->addrlen = htonl(sender_address_len + slen);
4487 sizeof(struct GNUNET_PeerIdentity));
4491 memcpy (&((char*)&pong[1])[slen],
4493 sender_address_len);
4494 if (GNUNET_TIME_absolute_get_remaining (session_header->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4)
4496 /* create / update cached sig */
4498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4499 "Creating PONG signature to indicate active connection.\n");
4501 session_header->pong_sig_expires = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
4502 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4503 GNUNET_assert (GNUNET_OK ==
4504 GNUNET_CRYPTO_rsa_sign (my_private_key,
4506 &session_header->pong_signature));
4510 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4512 memcpy (&pong->signature,
4513 &session_header->pong_signature,
4514 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4520 /* peer wants to confirm that this is one of our addresses */
4524 plugin->api->check_address (plugin->api->cls,
4528 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4529 _("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
4530 a2s (plugin->short_name,
4535 oal = plugin->addresses;
4538 if ( (oal->addrlen == alen) &&
4545 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
4546 pong->header.size = htons (sizeof (struct TransportPongMessage) + alen + slen);
4547 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4548 pong->purpose.size =
4549 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4551 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4552 sizeof (struct GNUNET_PeerIdentity) + alen + slen);
4553 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
4554 pong->challenge = ping->challenge;
4555 pong->addrlen = htonl(alen + slen);
4558 sizeof(struct GNUNET_PeerIdentity));
4559 memcpy (&pong[1], plugin->short_name, slen);
4560 memcpy (&((char*)&pong[1])[slen], addr, alen);
4561 if ( (oal != NULL) &&
4562 (GNUNET_TIME_absolute_get_remaining (oal->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4) )
4564 /* create / update cached sig */
4566 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4567 "Creating PONG signature to indicate ownership.\n");
4569 oal->pong_sig_expires = GNUNET_TIME_absolute_min (oal->expires,
4570 GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4571 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4572 GNUNET_assert (GNUNET_OK ==
4573 GNUNET_CRYPTO_rsa_sign (my_private_key,
4575 &oal->pong_signature));
4576 memcpy (&pong->signature,
4577 &oal->pong_signature,
4578 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4580 else if (oal == NULL)
4582 /* not using cache (typically DV-only) */
4583 pong->expiration = GNUNET_TIME_absolute_hton (GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4584 GNUNET_assert (GNUNET_OK ==
4585 GNUNET_CRYPTO_rsa_sign (my_private_key,
4591 /* can used cached version */
4592 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4593 memcpy (&pong->signature,
4594 &oal->pong_signature,
4595 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4598 n = find_neighbour(peer);
4599 GNUNET_assert (n != NULL);
4600 /* first try reliable response transmission */
4604 fal = rl->addresses;
4607 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4610 ntohs (pong->header.size),
4611 TRANSPORT_PONG_PRIORITY,
4612 HELLO_VERIFICATION_TIMEOUT,
4620 GNUNET_STATISTICS_update (stats,
4621 gettext_noop ("# PONGs unicast via reliable transport"),
4631 /* no reliable method found, do multicast */
4632 GNUNET_STATISTICS_update (stats,
4633 gettext_noop ("# PONGs multicast to all available addresses"),
4639 fal = rl->addresses;
4642 transmit_to_peer(NULL, fal,
4643 TRANSPORT_PONG_PRIORITY,
4644 HELLO_VERIFICATION_TIMEOUT,
4646 ntohs(pong->header.size),
4659 * Function called by the plugin for each received message.
4660 * Update data volumes, possibly notify plugins about
4661 * reducing the rate at which they read from the socket
4662 * and generally forward to our receive callback.
4664 * @param cls the "struct TransportPlugin *" we gave to the plugin
4665 * @param peer (claimed) identity of the other peer
4666 * @param message the message, NULL if we only care about
4667 * learning about the delay until we should receive again
4668 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
4669 * @param session identifier used for this session (can be NULL)
4670 * @param sender_address binary address of the sender (if observed)
4671 * @param sender_address_len number of bytes in sender_address
4672 * @return how long in ms the plugin should wait until receiving more data
4673 * (plugins that do not support this, can ignore the return value)
4675 static struct GNUNET_TIME_Relative
4676 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4677 const struct GNUNET_MessageHeader *message,
4679 struct Session *session,
4680 const char *sender_address,
4681 uint16_t sender_address_len)
4683 struct TransportPlugin *plugin = cls;
4684 struct ReadyList *service_context;
4685 struct ForeignAddressList *peer_address;
4687 struct NeighbourList *n;
4688 struct GNUNET_TIME_Relative ret;
4689 if (is_blacklisted (peer, plugin))
4690 return GNUNET_TIME_UNIT_FOREVER_REL;
4692 n = find_neighbour (peer);
4694 n = setup_new_neighbour (peer, GNUNET_YES);
4695 service_context = n->plugins;
4696 while ((service_context != NULL) && (plugin != service_context->plugin))
4697 service_context = service_context->next;
4698 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4699 peer_address = NULL;
4700 if (message != NULL)
4702 if ( (session != NULL) ||
4703 (sender_address != NULL) )
4704 peer_address = add_peer_address (n,
4708 sender_address_len);
4709 if (peer_address != NULL)
4711 peer_address->distance = distance;
4712 if (GNUNET_YES == peer_address->validated)
4713 mark_address_connected (peer_address);
4714 peer_address->timeout
4716 GNUNET_TIME_relative_to_absolute
4717 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4718 schedule_next_ping (peer_address);
4720 /* update traffic received amount ... */
4721 msize = ntohs (message->size);
4722 GNUNET_STATISTICS_update (stats,
4723 gettext_noop ("# bytes received from other peers"),
4726 n->distance = distance;
4728 GNUNET_TIME_relative_to_absolute
4729 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4730 GNUNET_SCHEDULER_cancel (n->timeout_task);
4732 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4733 &neighbour_timeout_task, n);
4734 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4736 /* dropping message due to frequent inbound volume violations! */
4737 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4738 GNUNET_ERROR_TYPE_BULK,
4740 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4741 n->in_tracker.available_bytes_per_s__,
4742 n->quota_violation_count);
4743 GNUNET_STATISTICS_update (stats,
4744 gettext_noop ("# bandwidth quota violations by other peers"),
4747 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4751 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4752 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
4753 ntohs (message->type),
4754 ntohs (message->size),
4757 switch (ntohs (message->type))
4759 case GNUNET_MESSAGE_TYPE_HELLO:
4760 GNUNET_STATISTICS_update (stats,
4761 gettext_noop ("# HELLO messages received from other peers"),
4764 process_hello (plugin, message);
4766 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4767 handle_ping (plugin, message, peer, session, sender_address, sender_address_len);
4769 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4770 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4773 handle_payload_message (message, n);
4777 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4778 if (ret.rel_value > 0)
4780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4781 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4782 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4783 (unsigned int) n->in_tracker.available_bytes_per_s__,
4784 (unsigned long long) ret.rel_value);
4785 GNUNET_STATISTICS_update (stats,
4786 gettext_noop ("# ms throttling suggested"),
4787 (int64_t) ret.rel_value,
4794 * Handle START-message. This is the first message sent to us
4795 * by any client which causes us to add it to our list.
4797 * @param cls closure (always NULL)
4798 * @param client identification of the client
4799 * @param message the actual message
4802 handle_start (void *cls,
4803 struct GNUNET_SERVER_Client *client,
4804 const struct GNUNET_MessageHeader *message)
4806 const struct StartMessage *start;
4807 struct TransportClient *c;
4808 struct ConnectInfoMessage cim;
4809 struct NeighbourList *n;
4811 start = (const struct StartMessage*) message;
4813 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4814 "Received `%s' request from client\n", "START");
4819 if (c->client == client)
4821 /* client already on our list! */
4823 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4828 if ( (GNUNET_NO != ntohl (start->do_check)) &&
4829 (0 != memcmp (&start->self,
4831 sizeof (struct GNUNET_PeerIdentity))) )
4833 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4834 _("Rejecting control connection from peer `%s', which is not me!\n"),
4835 GNUNET_i2s (&start->self));
4836 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4839 c = GNUNET_malloc (sizeof (struct TransportClient));
4843 if (our_hello != NULL)
4846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4847 "Sending our own `%s' to new client\n", "HELLO");
4849 transmit_to_client (c,
4850 (const struct GNUNET_MessageHeader *) our_hello,
4852 /* tell new client about all existing connections */
4853 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
4854 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4855 cim.ats_count = htonl(0);
4856 cim.ats.type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
4857 cim.ats.value = htonl (0);
4861 if (GNUNET_YES == n->received_pong)
4864 transmit_to_client (c, &cim.header, GNUNET_NO);
4869 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4874 * Handle HELLO-message.
4876 * @param cls closure (always NULL)
4877 * @param client identification of the client
4878 * @param message the actual message
4881 handle_hello (void *cls,
4882 struct GNUNET_SERVER_Client *client,
4883 const struct GNUNET_MessageHeader *message)
4887 GNUNET_STATISTICS_update (stats,
4888 gettext_noop ("# HELLOs received from clients"),
4891 ret = process_hello (NULL, message);
4892 GNUNET_SERVER_receive_done (client, ret);
4897 * Closure for 'transmit_client_message'; followed by
4898 * 'msize' bytes of the actual message.
4900 struct TransmitClientMessageContext
4903 * Client on whom's behalf we are sending.
4905 struct GNUNET_SERVER_Client *client;
4908 * Timeout for the transmission.
4910 struct GNUNET_TIME_Absolute timeout;
4918 * Size of the message in bytes.
4925 * Schedule transmission of a message we got from a client to a peer.
4927 * @param cls the 'struct TransmitClientMessageContext*'
4928 * @param n destination, or NULL on error (in that case, drop the message)
4931 transmit_client_message (void *cls,
4932 struct NeighbourList *n)
4934 struct TransmitClientMessageContext *tcmc = cls;
4935 struct TransportClient *tc;
4938 while ((tc != NULL) && (tc->client != tcmc->client))
4943 transmit_to_peer (tc, NULL, tcmc->priority,
4944 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
4946 tcmc->msize, GNUNET_NO, n);
4948 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
4949 GNUNET_SERVER_client_drop (tcmc->client);
4955 * Handle SEND-message.
4957 * @param cls closure (always NULL)
4958 * @param client identification of the client
4959 * @param message the actual message
4962 handle_send (void *cls,
4963 struct GNUNET_SERVER_Client *client,
4964 const struct GNUNET_MessageHeader *message)
4966 const struct OutboundMessage *obm;
4967 const struct GNUNET_MessageHeader *obmm;
4968 struct TransmitClientMessageContext *tcmc;
4972 size = ntohs (message->size);
4974 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
4977 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4980 GNUNET_STATISTICS_update (stats,
4981 gettext_noop ("# payload received for other peers"),
4984 obm = (const struct OutboundMessage *) message;
4985 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
4986 msize = size - sizeof (struct OutboundMessage);
4988 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4989 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
4990 "SEND", GNUNET_i2s (&obm->peer),
4994 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
4995 tcmc->client = client;
4996 tcmc->priority = ntohl (obm->priority);
4997 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
4998 tcmc->msize = msize;
4999 /* FIXME: this memcpy can be up to 7% of our total runtime */
5000 memcpy (&tcmc[1], obmm, msize);
5001 GNUNET_SERVER_client_keep (client);
5002 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
5003 &transmit_client_message,
5009 * Handle request connect message
5011 * @param cls closure (always NULL)
5012 * @param client identification of the client
5013 * @param message the actual message
5016 handle_request_connect (void *cls,
5017 struct GNUNET_SERVER_Client *client,
5018 const struct GNUNET_MessageHeader *message)
5020 const struct TransportRequestConnectMessage *trcm =
5021 (const struct TransportRequestConnectMessage *) message;
5023 GNUNET_STATISTICS_update (stats,
5024 gettext_noop ("# REQUEST CONNECT messages received"),
5027 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received a request connect message for peer %s\n", GNUNET_i2s(&trcm->peer));
5028 setup_peer_check_blacklist (&trcm->peer, GNUNET_YES,
5030 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5034 * Handle SET_QUOTA-message.
5036 * @param cls closure (always NULL)
5037 * @param client identification of the client
5038 * @param message the actual message
5041 handle_set_quota (void *cls,
5042 struct GNUNET_SERVER_Client *client,
5043 const struct GNUNET_MessageHeader *message)
5045 const struct QuotaSetMessage *qsm =
5046 (const struct QuotaSetMessage *) message;
5047 struct NeighbourList *n;
5049 GNUNET_STATISTICS_update (stats,
5050 gettext_noop ("# SET QUOTA messages received"),
5053 n = find_neighbour (&qsm->peer);
5056 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5057 GNUNET_STATISTICS_update (stats,
5058 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
5064 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5065 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
5067 (unsigned int) ntohl (qsm->quota.value__),
5068 (unsigned int) n->in_tracker.available_bytes_per_s__,
5069 GNUNET_i2s (&qsm->peer));
5071 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
5073 if (0 == ntohl (qsm->quota.value__))
5075 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5076 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&n->id),
5078 disconnect_neighbour (n, GNUNET_NO);
5080 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5085 * Take the given address and append it to the set of results sent back to
5088 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
5089 * @param address the resolved name, NULL to indicate the last response
5092 transmit_address_to_client (void *cls, const char *address)
5094 struct GNUNET_SERVER_TransmitContext *tc = cls;
5097 if (NULL == address)
5100 slen = strlen (address) + 1;
5102 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
5103 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5104 if (NULL == address)
5105 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
5110 * Handle AddressLookup-message.
5112 * @param cls closure (always NULL)
5113 * @param client identification of the client
5114 * @param message the actual message
5117 handle_address_lookup (void *cls,
5118 struct GNUNET_SERVER_Client *client,
5119 const struct GNUNET_MessageHeader *message)
5121 const struct AddressLookupMessage *alum;
5122 struct TransportPlugin *lsPlugin;
5123 const char *nameTransport;
5124 const char *address;
5126 struct GNUNET_SERVER_TransmitContext *tc;
5127 struct GNUNET_TIME_Absolute timeout;
5128 struct GNUNET_TIME_Relative rtimeout;
5131 size = ntohs (message->size);
5132 if (size < sizeof (struct AddressLookupMessage))
5134 GNUNET_break_op (0);
5135 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5138 alum = (const struct AddressLookupMessage *) message;
5139 uint32_t addressLen = ntohl (alum->addrlen);
5140 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
5142 GNUNET_break_op (0);
5143 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5146 address = (const char *) &alum[1];
5147 nameTransport = (const char *) &address[addressLen];
5149 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
5151 GNUNET_break_op (0);
5152 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5155 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
5156 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
5157 numeric = ntohl (alum->numeric_only);
5158 lsPlugin = find_transport (nameTransport);
5159 if (NULL == lsPlugin)
5161 tc = GNUNET_SERVER_transmit_context_create (client);
5162 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
5163 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5164 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
5167 tc = GNUNET_SERVER_transmit_context_create (client);
5168 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
5170 address, addressLen,
5173 &transmit_address_to_client, tc);
5178 * Setup the environment for this plugin.
5181 create_environment (struct TransportPlugin *plug)
5183 plug->env.cfg = cfg;
5184 plug->env.my_identity = &my_identity;
5185 plug->env.our_hello = &our_hello;
5186 plug->env.cls = plug;
5187 plug->env.receive = &plugin_env_receive;
5188 plug->env.notify_address = &plugin_env_notify_address;
5189 plug->env.session_end = &plugin_env_session_end;
5190 plug->env.max_connections = max_connect_per_transport;
5191 plug->env.stats = stats;
5196 * Start the specified transport (load the plugin).
5199 start_transport (struct GNUNET_SERVER_Handle *server,
5202 struct TransportPlugin *plug;
5205 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5206 _("Loading `%s' transport plugin\n"), name);
5207 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
5208 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
5209 create_environment (plug);
5210 plug->short_name = GNUNET_strdup (name);
5211 plug->lib_name = libname;
5212 plug->next = plugins;
5214 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
5215 if (plug->api == NULL)
5217 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5218 _("Failed to load transport plugin for `%s'\n"), name);
5219 GNUNET_free (plug->short_name);
5220 plugins = plug->next;
5221 GNUNET_free (libname);
5228 * Called whenever a client is disconnected. Frees our
5229 * resources associated with that client.
5231 * @param cls closure
5232 * @param client identification of the client
5235 client_disconnect_notification (void *cls,
5236 struct GNUNET_SERVER_Client *client)
5238 struct TransportClient *pos;
5239 struct TransportClient *prev;
5240 struct ClientMessageQueueEntry *mqe;
5241 struct Blacklisters *bl;
5242 struct BlacklistCheck *bc;
5247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
5248 "Client disconnected, cleaning up.\n");
5250 /* clean up blacklister */
5254 if (bl->client == client)
5259 if (bc->bl_pos == bl)
5261 bc->bl_pos = bl->next;
5264 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
5267 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
5268 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
5274 GNUNET_CONTAINER_DLL_remove (bl_head,
5277 GNUNET_SERVER_client_drop (bl->client);
5283 /* clean up 'normal' clients */
5286 while ((pos != NULL) && (pos->client != client))
5293 while (NULL != (mqe = pos->message_queue_head))
5295 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
5296 pos->message_queue_tail,
5298 pos->message_count--;
5302 clients = pos->next;
5304 prev->next = pos->next;
5305 if (GNUNET_YES == pos->tcs_pending)
5310 if (pos->th != NULL)
5312 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
5315 GNUNET_break (0 == pos->message_count);
5321 * Function called when the service shuts down. Unloads our plugins
5322 * and cancels pending validations.
5324 * @param cls closure, unused
5325 * @param tc task context (unused)
5328 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5330 struct TransportPlugin *plug;
5331 struct OwnAddressList *al;
5332 struct CheckHelloValidatedContext *chvc;
5334 while (neighbours != NULL)
5336 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5337 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&neighbours->id),
5339 disconnect_neighbour (neighbours, GNUNET_NO);
5342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5343 "Transport service is unloading plugins...\n");
5345 while (NULL != (plug = plugins))
5347 plugins = plug->next;
5348 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
5350 GNUNET_SCHEDULER_cancel (plug->address_update_task);
5351 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
5353 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
5354 GNUNET_free (plug->lib_name);
5355 GNUNET_free (plug->short_name);
5356 while (NULL != (al = plug->addresses))
5358 plug->addresses = al->next;
5363 if (my_private_key != NULL)
5364 GNUNET_CRYPTO_rsa_key_free (my_private_key);
5365 GNUNET_free_non_null (our_hello);
5367 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
5370 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5371 validation_map = NULL;
5373 /* free 'chvc' data structure */
5374 while (NULL != (chvc = chvc_head))
5376 chvc_head = chvc->next;
5377 if (chvc->piter != NULL)
5379 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
5380 GNUNET_STATISTICS_update (stats,
5381 gettext_noop ("# outstanding peerinfo iterate requests"),
5387 GNUNET_assert (chvc->ve_count == 0);
5394 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5397 if (peerinfo != NULL)
5399 GNUNET_PEERINFO_disconnect (peerinfo);
5402 /* Can we assume those are gone by now, or do we need to clean up
5404 GNUNET_break (bl_head == NULL);
5405 GNUNET_break (bc_head == NULL);
5410 * Initiate transport service.
5412 * @param cls closure
5413 * @param server the initialized server
5414 * @param c configuration to use
5418 struct GNUNET_SERVER_Handle *server,
5419 const struct GNUNET_CONFIGURATION_Handle *c)
5421 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
5422 {&handle_start, NULL,
5423 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
5424 {&handle_hello, NULL,
5425 GNUNET_MESSAGE_TYPE_HELLO, 0},
5426 {&handle_send, NULL,
5427 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
5428 {&handle_request_connect, NULL,
5429 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT, sizeof(struct TransportRequestConnectMessage)},
5430 {&handle_set_quota, NULL,
5431 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
5432 {&handle_address_lookup, NULL,
5433 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
5435 {&handle_blacklist_init, NULL,
5436 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
5437 {&handle_blacklist_reply, NULL,
5438 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
5444 unsigned long long tneigh;
5448 stats = GNUNET_STATISTICS_create ("transport", cfg);
5449 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
5450 /* parse configuration */
5452 GNUNET_CONFIGURATION_get_value_number (c,
5457 GNUNET_CONFIGURATION_get_value_filename (c,
5459 "HOSTKEY", &keyfile)))
5461 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5463 ("Transport service is lacking key configuration settings. Exiting.\n"));
5464 GNUNET_SCHEDULER_shutdown ();
5467 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5470 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5471 validation_map = NULL;
5474 max_connect_per_transport = (uint32_t) tneigh;
5475 peerinfo = GNUNET_PEERINFO_connect (cfg);
5476 if (peerinfo == NULL)
5478 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5479 _("Could not access PEERINFO service. Exiting.\n"));
5480 GNUNET_SCHEDULER_shutdown ();
5483 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5486 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5487 validation_map = NULL;
5488 GNUNET_free (keyfile);
5491 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
5492 GNUNET_free (keyfile);
5493 if (my_private_key == NULL)
5495 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5497 ("Transport service could not access hostkey. Exiting.\n"));
5498 GNUNET_SCHEDULER_shutdown ();
5501 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5504 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5505 validation_map = NULL;
5508 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
5509 GNUNET_CRYPTO_hash (&my_public_key,
5510 sizeof (my_public_key), &my_identity.hashPubKey);
5511 /* setup notification */
5512 GNUNET_SERVER_disconnect_notify (server,
5513 &client_disconnect_notification, NULL);
5514 /* load plugins... */
5517 GNUNET_CONFIGURATION_get_value_string (c,
5518 "TRANSPORT", "PLUGINS", &plugs))
5520 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5521 _("Starting transport plugins `%s'\n"), plugs);
5522 pos = strtok (plugs, " ");
5525 start_transport (server, pos);
5527 pos = strtok (NULL, " ");
5529 GNUNET_free (plugs);
5531 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
5532 &shutdown_task, NULL);
5537 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
5539 /* If we have a blacklist file, read from it */
5540 read_blacklist_file(cfg);
5541 /* process client requests */
5542 GNUNET_SERVER_add_handlers (server, handlers);
5547 * The main function for the transport service.
5549 * @param argc number of arguments from the command line
5550 * @param argv command line arguments
5551 * @return 0 ok, 1 on error
5554 main (int argc, char *const *argv)
5556 a2s (NULL, NULL, 0); /* make compiler happy */
5557 return (GNUNET_OK ==
5558 GNUNET_SERVICE_run (argc,
5561 GNUNET_SERVICE_OPTION_NONE,
5562 &run, NULL)) ? 0 : 1;
5565 /* end of gnunet-service-transport.c */