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, int fresh)
1910 static struct GNUNET_TIME_Absolute last_update;
1911 struct GNUNET_TIME_Relative min_remaining;
1912 struct GNUNET_TIME_Relative remaining;
1913 struct GNUNET_TIME_Absolute now;
1914 struct OwnAddressList *pos;
1915 struct OwnAddressList *prev;
1916 struct OwnAddressList *next;
1919 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1920 GNUNET_SCHEDULER_cancel (plugin->address_update_task);
1921 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1922 now = GNUNET_TIME_absolute_get ();
1923 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1924 expired = (GNUNET_TIME_absolute_get_duration (last_update).rel_value > (HELLO_ADDRESS_EXPIRATION.rel_value / 4));
1926 pos = plugin->addresses;
1930 if (pos->expires.abs_value < now.abs_value)
1932 expired = GNUNET_YES;
1934 plugin->addresses = pos->next;
1936 prev->next = pos->next;
1941 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1942 if (remaining.rel_value < min_remaining.rel_value)
1943 min_remaining = remaining;
1949 if (expired || fresh)
1954 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1955 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1957 plugin->address_update_task
1958 = GNUNET_SCHEDULER_add_delayed (min_remaining,
1959 &expire_address_task, plugin);
1964 * Task used to clean up expired addresses for a plugin.
1966 * @param cls closure
1970 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1972 struct TransportPlugin *plugin = cls;
1974 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1975 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1976 update_addresses (plugin, GNUNET_NO);
1981 * Iterator over hash map entries that NULLs the session of validation
1982 * entries that match the given session.
1984 * @param cls closure (the 'struct Session*' to match against)
1985 * @param key current key code (peer ID, not used)
1986 * @param value value in the hash map ('struct ValidationEntry*')
1987 * @return GNUNET_YES (we should continue to iterate)
1990 remove_session_validations (void *cls,
1991 const GNUNET_HashCode * key,
1994 struct Session *session = cls;
1995 struct ValidationEntry *ve = value;
1997 if (session == ve->session)
2004 * We've been disconnected from the other peer (for some
2005 * connection-oriented transport). Either quickly
2006 * re-establish the connection or signal the disconnect
2009 * Only signal CORE level disconnect if ALL addresses
2010 * for the peer are exhausted.
2012 * @param p overall plugin context
2013 * @param nl neighbour that was disconnected
2016 try_fast_reconnect (struct TransportPlugin *p,
2017 struct NeighbourList *nl)
2019 /* FIXME-MW: fast reconnect / transport switching not implemented... */
2020 /* Note: the idea here is to hide problems with transports (or
2021 switching between plugins) from the core to eliminate the need to
2022 re-negotiate session keys and the like; OTOH, we should tell core
2023 quickly (much faster than timeout) `if a connection was lost and
2024 could not be re-established (i.e. other peer went down or is
2025 unable / refuses to communicate);
2027 So we should consider:
2028 1) ideally: our own willingness / need to connect
2029 2) prior failures to connect to this peer (by plugin)
2030 3) ideally: reasons why other peer terminated (as far as knowable)
2032 Most importantly, it must be POSSIBLE for another peer to terminate
2033 a connection for a while (without us instantly re-establishing it).
2034 Similarly, if another peer is gone we should quickly notify CORE.
2035 OTOH, if there was a minor glitch (i.e. crash of gnunet-service-transport
2036 on the other end), we should reconnect in such a way that BOTH CORE
2037 services never even notice.
2038 Furthermore, the same mechanism (or small variation) could be used
2039 to switch to a better-performing plugin (ATS).
2041 Finally, this needs to be tested throughly... */
2044 * GNUNET_NO in the call below makes transport disconnect the peer,
2045 * even if only a single address (out of say, six) went away. This
2046 * function must be careful to ONLY disconnect if the peer is gone,
2047 * not just a specifi address.
2049 * More specifically, half the places it was used had it WRONG.
2052 /* No reconnect, signal disconnect instead! */
2053 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2054 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&nl->id),
2055 "try_fast_reconnect");
2056 disconnect_neighbour (nl, GNUNET_YES);
2061 * Function that will be called whenever the plugin internally
2062 * cleans up a session pointer and hence the service needs to
2063 * discard all of those sessions as well. Plugins that do not
2064 * use sessions can simply omit calling this function and always
2065 * use NULL wherever a session pointer is needed.
2067 * @param cls closure
2068 * @param peer which peer was the session for
2069 * @param session which session is being destoyed
2072 plugin_env_session_end (void *cls,
2073 const struct GNUNET_PeerIdentity *peer,
2074 struct Session *session)
2076 struct TransportPlugin *p = cls;
2077 struct NeighbourList *nl;
2078 struct ReadyList *rl;
2079 struct ForeignAddressList *pos;
2080 struct ForeignAddressList *prev;
2082 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2083 &remove_session_validations,
2085 nl = find_neighbour (peer);
2087 return; /* was never marked as connected */
2091 if (rl->plugin == p)
2096 return; /* was never marked as connected */
2098 pos = rl->addresses;
2099 while ( (pos != NULL) &&
2100 (pos->session != session) )
2106 return; /* was never marked as connected */
2107 pos->session = NULL;
2108 if (pos->addrlen != 0)
2110 if (nl->received_pong != GNUNET_NO)
2111 try_fast_reconnect (p, nl);
2114 /* was inbound connection, free 'pos' */
2116 rl->addresses = pos->next;
2118 prev->next = pos->next;
2119 if (GNUNET_SCHEDULER_NO_TASK != pos->revalidate_task)
2121 GNUNET_SCHEDULER_cancel (pos->revalidate_task);
2122 pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2125 if (nl->received_pong == GNUNET_NO)
2126 return; /* nothing to do, never connected... */
2127 /* check if we have any validated addresses left */
2128 pos = rl->addresses;
2133 try_fast_reconnect (p, nl);
2138 /* no valid addresses left, signal disconnect! */
2140 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2141 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&nl->id),
2142 "plugin_env_session_end");
2143 /* FIXME: This doesn't mean there are no addresses left for this PEER,
2144 * it means there aren't any left for this PLUGIN/PEER combination! So
2145 * calling disconnect_neighbor here with GNUNET_NO forces disconnect
2146 * when it isn't necessary. Using GNUNET_YES at least checks to see
2147 * if there are any addresses that work first, so as not to overdo it.
2150 disconnect_neighbour (nl, GNUNET_YES);
2155 * Function that must be called by each plugin to notify the
2156 * transport service about the addresses under which the transport
2157 * provided by the plugin can be reached.
2159 * @param cls closure
2160 * @param name name of the transport that generated the address
2161 * @param addr one of the addresses of the host, NULL for the last address
2162 * the specific address format depends on the transport
2163 * @param addrlen length of the address
2164 * @param expires when should this address automatically expire?
2167 plugin_env_notify_address (void *cls,
2171 struct GNUNET_TIME_Relative expires)
2173 struct TransportPlugin *p = cls;
2174 struct OwnAddressList *al;
2175 struct GNUNET_TIME_Absolute abex;
2177 GNUNET_assert (addr != NULL);
2178 abex = GNUNET_TIME_relative_to_absolute (expires);
2179 GNUNET_assert (p == find_transport (name));
2183 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
2185 if (al->expires.abs_value < abex.abs_value)
2192 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
2193 al->next = p->addresses;
2196 al->addrlen = addrlen;
2197 memcpy (&al[1], addr, addrlen);
2198 update_addresses (p, GNUNET_YES);
2203 * Notify all of our clients about a peer connecting.
2206 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
2207 struct GNUNET_TIME_Relative latency,
2210 struct ConnectInfoMessage cim;
2211 struct TransportClient *cpos;
2214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2215 "Notifying clients about connection from `%s'\n",
2218 GNUNET_STATISTICS_update (stats,
2219 gettext_noop ("# peers connected"),
2222 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2223 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2224 cim.distance = htonl (distance);
2225 cim.latency = GNUNET_TIME_relative_hton (latency);
2226 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
2228 while (cpos != NULL)
2230 transmit_to_client (cpos, &cim.header, GNUNET_NO);
2237 * Notify all of our clients about a peer disconnecting.
2240 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2242 struct DisconnectInfoMessage dim;
2243 struct TransportClient *cpos;
2246 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2247 "Notifying clients about lost connection to `%s'\n",
2250 GNUNET_STATISTICS_update (stats,
2251 gettext_noop ("# peers connected"),
2254 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2255 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2256 dim.reserved = htonl (0);
2257 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2259 while (cpos != NULL)
2261 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2268 * Find a ForeignAddressList entry for the given neighbour
2269 * that matches the given address and transport.
2271 * @param neighbour which peer we care about
2272 * @param tname name of the transport plugin
2273 * @param session session to look for, NULL for 'any'; otherwise
2274 * can be used for the service to "learn" this session ID
2276 * @param addr binary address
2277 * @param addrlen length of addr
2278 * @return NULL if no such entry exists
2280 static struct ForeignAddressList *
2281 find_peer_address(struct NeighbourList *neighbour,
2283 struct Session *session,
2287 struct ReadyList *head;
2288 struct ForeignAddressList *pos;
2290 head = neighbour->plugins;
2291 while (head != NULL)
2293 if (0 == strcmp (tname, head->plugin->short_name))
2299 pos = head->addresses;
2300 while ( (pos != NULL) &&
2301 ( (pos->addrlen != addrlen) ||
2302 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2304 if ( (session != NULL) &&
2305 (pos->session == session) )
2309 if ( (session != NULL) && (pos != NULL) )
2310 pos->session = session; /* learn it! */
2316 * Get the peer address struct for the given neighbour and
2317 * address. If it doesn't yet exist, create it.
2319 * @param neighbour which peer we care about
2320 * @param tname name of the transport plugin
2321 * @param session session of the plugin, or NULL for none
2322 * @param addr binary address
2323 * @param addrlen length of addr
2324 * @return NULL if we do not have a transport plugin for 'tname'
2326 static struct ForeignAddressList *
2327 add_peer_address (struct NeighbourList *neighbour,
2329 struct Session *session,
2333 struct ReadyList *head;
2334 struct ForeignAddressList *ret;
2336 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2339 head = neighbour->plugins;
2341 while (head != NULL)
2343 if (0 == strcmp (tname, head->plugin->short_name))
2349 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2350 ret->session = session;
2353 ret->addr = (const char*) &ret[1];
2354 memcpy (&ret[1], addr, addrlen);
2360 ret->addrlen = addrlen;
2361 ret->expires = GNUNET_TIME_relative_to_absolute
2362 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2363 ret->latency = GNUNET_TIME_relative_get_forever();
2365 ret->timeout = GNUNET_TIME_relative_to_absolute
2366 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2367 ret->ready_list = head;
2368 ret->next = head->addresses;
2369 head->addresses = ret;
2375 * Closure for 'add_validated_address'.
2377 struct AddValidatedAddressContext
2380 * Entry that has been validated.
2382 const struct ValidationEntry *ve;
2385 * Flag set after we have added the address so
2386 * that we terminate the iteration next time.
2393 * Callback function used to fill a buffer of max bytes with a list of
2394 * addresses in the format used by HELLOs. Should use
2395 * "GNUNET_HELLO_add_address" as a helper function.
2397 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2398 * @param max maximum number of bytes that can be written to buf
2399 * @param buf where to write the address information
2400 * @return number of bytes written, 0 to signal the
2401 * end of the iteration.
2404 add_validated_address (void *cls,
2405 size_t max, void *buf)
2407 struct AddValidatedAddressContext *avac = cls;
2408 const struct ValidationEntry *ve = avac->ve;
2410 if (GNUNET_YES == avac->done)
2412 avac->done = GNUNET_YES;
2413 return GNUNET_HELLO_add_address (ve->transport_name,
2414 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2424 * Closure for 'check_address_exists'.
2426 struct CheckAddressExistsClosure
2429 * Address to check for.
2434 * Name of the transport.
2441 struct Session *session;
2444 * Set to GNUNET_YES if the address exists.
2457 * Iterator over hash map entries. Checks if the given
2458 * validation entry is for the same address as what is given
2461 * @param cls the 'struct CheckAddressExistsClosure*'
2462 * @param key current key code (ignored)
2463 * @param value value in the hash map ('struct ValidationEntry')
2464 * @return GNUNET_YES if we should continue to
2465 * iterate (mismatch), GNUNET_NO if not (entry matched)
2468 check_address_exists (void *cls,
2469 const GNUNET_HashCode * key,
2472 struct CheckAddressExistsClosure *caec = cls;
2473 struct ValidationEntry *ve = value;
2475 if ( (0 == strcmp (caec->tname,
2476 ve->transport_name)) &&
2477 (caec->addrlen == ve->addrlen) &&
2478 (0 == memcmp (caec->addr,
2482 caec->exists = GNUNET_YES;
2485 if ( (ve->session != NULL) &&
2486 (caec->session == ve->session) )
2488 caec->exists = GNUNET_YES;
2497 * Iterator to free entries in the validation_map.
2499 * @param cls closure (unused)
2500 * @param key current key code
2501 * @param value value in the hash map (validation to abort)
2502 * @return GNUNET_YES (always)
2505 abort_validation (void *cls,
2506 const GNUNET_HashCode * key,
2509 struct ValidationEntry *va = value;
2511 if (GNUNET_SCHEDULER_NO_TASK != va->timeout_task)
2512 GNUNET_SCHEDULER_cancel (va->timeout_task);
2513 GNUNET_free (va->transport_name);
2514 if (va->chvc != NULL)
2516 va->chvc->ve_count--;
2517 if (va->chvc->ve_count == 0)
2519 GNUNET_CONTAINER_DLL_remove (chvc_head,
2522 GNUNET_free (va->chvc);
2532 * HELLO validation cleanup task (validation failed).
2534 * @param cls the 'struct ValidationEntry' that failed
2535 * @param tc scheduler context (unused)
2538 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2540 struct ValidationEntry *va = cls;
2541 struct GNUNET_PeerIdentity pid;
2543 va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2544 GNUNET_STATISTICS_update (stats,
2545 gettext_noop ("# address validation timeouts"),
2548 GNUNET_CRYPTO_hash (&va->publicKey,
2550 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2552 GNUNET_break (GNUNET_OK ==
2553 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2556 abort_validation (NULL, NULL, va);
2561 neighbour_timeout_task (void *cls,
2562 const struct GNUNET_SCHEDULER_TaskContext *tc)
2564 struct NeighbourList *n = cls;
2567 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2568 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2570 GNUNET_STATISTICS_update (stats,
2571 gettext_noop ("# disconnects due to timeout"),
2574 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2575 disconnect_neighbour (n, GNUNET_NO);
2580 * Schedule the job that will cause us to send a PING to the
2581 * foreign address to evaluate its validity and latency.
2583 * @param fal address to PING
2586 schedule_next_ping (struct ForeignAddressList *fal);
2590 * Add the given address to the list of foreign addresses
2591 * available for the given peer (check for duplicates).
2593 * @param cls the respective 'struct NeighbourList' to update
2594 * @param tname name of the transport
2595 * @param expiration expiration time
2596 * @param addr the address
2597 * @param addrlen length of the address
2598 * @return GNUNET_OK (always)
2601 add_to_foreign_address_list (void *cls,
2603 struct GNUNET_TIME_Absolute expiration,
2607 struct NeighbourList *n = cls;
2608 struct ForeignAddressList *fal;
2611 GNUNET_STATISTICS_update (stats,
2612 gettext_noop ("# valid peer addresses returned by PEERINFO"),
2616 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2619 #if DEBUG_TRANSPORT_HELLO
2620 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2621 "Adding address `%s' (%s) for peer `%4s' due to PEERINFO data for %llums.\n",
2622 a2s (tname, addr, addrlen),
2624 GNUNET_i2s (&n->id),
2625 expiration.abs_value);
2627 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2630 GNUNET_STATISTICS_update (stats,
2631 gettext_noop ("# previously validated addresses lacking transport"),
2637 fal->expires = GNUNET_TIME_absolute_max (expiration,
2639 schedule_next_ping (fal);
2645 fal->expires = GNUNET_TIME_absolute_max (expiration,
2650 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2651 "Failed to add new address for `%4s'\n",
2652 GNUNET_i2s (&n->id));
2655 if (fal->validated == GNUNET_NO)
2657 fal->validated = GNUNET_YES;
2658 GNUNET_STATISTICS_update (stats,
2659 gettext_noop ("# peer addresses considered valid"),
2663 if (try == GNUNET_YES)
2665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2666 "Have new addresses, will try to trigger transmissions.\n");
2667 try_transmission_to_peer (n);
2674 * Add addresses in validated HELLO "h" to the set of addresses
2675 * we have for this peer.
2677 * @param cls closure ('struct NeighbourList*')
2678 * @param peer id of the peer, NULL for last call
2679 * @param h hello message for the peer (can be NULL)
2682 add_hello_for_peer (void *cls,
2683 const struct GNUNET_PeerIdentity *peer,
2684 const struct GNUNET_HELLO_Message *h)
2686 struct NeighbourList *n = cls;
2690 GNUNET_STATISTICS_update (stats,
2691 gettext_noop ("# outstanding peerinfo iterate requests"),
2698 return; /* no HELLO available */
2700 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2701 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2705 if (GNUNET_YES != n->public_key_valid)
2707 GNUNET_HELLO_get_key (h, &n->publicKey);
2708 n->public_key_valid = GNUNET_YES;
2710 GNUNET_HELLO_iterate_addresses (h,
2712 &add_to_foreign_address_list,
2718 * Create a fresh entry in our neighbour list for the given peer.
2719 * Will try to transmit our current HELLO to the new neighbour.
2720 * Do not call this function directly, use 'setup_peer_check_blacklist.
2722 * @param peer the peer for which we create the entry
2723 * @param do_hello should we schedule transmitting a HELLO
2724 * @return the new neighbour list entry
2726 static struct NeighbourList *
2727 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2730 struct NeighbourList *n;
2731 struct TransportPlugin *tp;
2732 struct ReadyList *rl;
2735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2736 "Setting up state for neighbour `%4s'\n",
2739 GNUNET_assert (our_hello != NULL);
2740 GNUNET_STATISTICS_update (stats,
2741 gettext_noop ("# active neighbours"),
2744 n = GNUNET_malloc (sizeof (struct NeighbourList));
2745 n->next = neighbours;
2749 GNUNET_TIME_relative_to_absolute
2750 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2751 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2752 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2753 MAX_BANDWIDTH_CARRY_S);
2757 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2759 rl = GNUNET_malloc (sizeof (struct ReadyList));
2761 rl->next = n->plugins;
2764 rl->addresses = NULL;
2768 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2770 n->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2771 &neighbour_timeout_task, n);
2774 GNUNET_STATISTICS_update (stats,
2775 gettext_noop ("# peerinfo new neighbor iterate requests"),
2778 GNUNET_STATISTICS_update (stats,
2779 gettext_noop ("# outstanding peerinfo iterate requests"),
2782 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2783 GNUNET_TIME_UNIT_FOREVER_REL,
2784 &add_hello_for_peer, n);
2786 GNUNET_STATISTICS_update (stats,
2787 gettext_noop ("# HELLO's sent to new neighbors"),
2790 transmit_to_peer (NULL, NULL, 0,
2791 HELLO_ADDRESS_EXPIRATION,
2792 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2800 * Function called after we have checked if communicating
2801 * with a given peer is acceptable.
2803 * @param cls closure
2804 * @param n NULL if communication is not acceptable
2806 typedef void (*SetupContinuation)(void *cls,
2807 struct NeighbourList *n);
2811 * Information kept for each client registered to perform
2817 * This is a linked list.
2819 struct Blacklisters *next;
2822 * This is a linked list.
2824 struct Blacklisters *prev;
2827 * Client responsible for this entry.
2829 struct GNUNET_SERVER_Client *client;
2832 * Blacklist check that we're currently performing.
2834 struct BlacklistCheck *bc;
2840 * Head of DLL of blacklisting clients.
2842 static struct Blacklisters *bl_head;
2845 * Tail of DLL of blacklisting clients.
2847 static struct Blacklisters *bl_tail;
2851 * Context we use when performing a blacklist check.
2853 struct BlacklistCheck
2857 * This is a linked list.
2859 struct BlacklistCheck *next;
2862 * This is a linked list.
2864 struct BlacklistCheck *prev;
2867 * Peer being checked.
2869 struct GNUNET_PeerIdentity peer;
2872 * Option for setup neighbour afterwards.
2877 * Continuation to call with the result.
2879 SetupContinuation cont;
2887 * Current transmission request handle for this client, or NULL if no
2888 * request is pending.
2890 struct GNUNET_CONNECTION_TransmitHandle *th;
2893 * Our current position in the blacklisters list.
2895 struct Blacklisters *bl_pos;
2898 * Current task performing the check.
2900 GNUNET_SCHEDULER_TaskIdentifier task;
2905 * Head of DLL of active blacklisting queries.
2907 static struct BlacklistCheck *bc_head;
2910 * Tail of DLL of active blacklisting queries.
2912 static struct BlacklistCheck *bc_tail;
2916 * Perform next action in the blacklist check.
2918 * @param cls the 'struct BlacklistCheck*'
2922 do_blacklist_check (void *cls,
2923 const struct GNUNET_SCHEDULER_TaskContext *tc);
2927 * Transmit blacklist query to the client.
2929 * @param cls the 'struct BlacklistCheck'
2930 * @param size number of bytes allowed
2931 * @param buf where to copy the message
2932 * @return number of bytes copied to buf
2935 transmit_blacklist_message (void *cls,
2939 struct BlacklistCheck *bc = cls;
2940 struct Blacklisters *bl;
2941 struct BlacklistMessage bm;
2946 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2947 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
2952 bm.header.size = htons (sizeof (struct BlacklistMessage));
2953 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2954 bm.is_allowed = htonl (0);
2956 memcpy (buf, &bm, sizeof (bm));
2957 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2963 * Perform next action in the blacklist check.
2965 * @param cls the 'struct BlacklistCheck*'
2969 do_blacklist_check (void *cls,
2970 const struct GNUNET_SCHEDULER_TaskContext *tc)
2972 struct BlacklistCheck *bc = cls;
2973 struct Blacklisters *bl;
2975 bc->task = GNUNET_SCHEDULER_NO_TASK;
2979 bc->cont (bc->cont_cls,
2980 setup_new_neighbour (&bc->peer, bc->do_hello));
2987 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
2988 sizeof (struct BlacklistMessage),
2989 GNUNET_TIME_UNIT_FOREVER_REL,
2990 &transmit_blacklist_message,
2997 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
2998 * does not yet exist, check the blacklist. If the blacklist says creating
2999 * one is acceptable, create one and call the continuation; otherwise
3000 * call the continuation with NULL.
3002 * @param peer peer to setup or look up a struct NeighbourList for
3003 * @param do_hello should we also schedule sending our HELLO to the peer
3004 * if this is a new record
3005 * @param cont function to call with the 'struct NeigbhbourList*'
3006 * @param cont_cls closure for cont
3009 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
3011 SetupContinuation cont,
3014 struct NeighbourList *n;
3015 struct BlacklistCheck *bc;
3017 n = find_neighbour(peer);
3024 if (bl_head == NULL)
3027 cont (cont_cls, setup_new_neighbour (peer, do_hello));
3029 setup_new_neighbour(peer, do_hello);
3032 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3033 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3035 bc->do_hello = do_hello;
3037 bc->cont_cls = cont_cls;
3038 bc->bl_pos = bl_head;
3039 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3045 * Function called with the result of querying a new blacklister about
3046 * it being allowed (or not) to continue to talk to an existing neighbour.
3048 * @param cls the original 'struct NeighbourList'
3049 * @param n NULL if we need to disconnect
3052 confirm_or_drop_neighbour (void *cls,
3053 struct NeighbourList *n)
3055 struct NeighbourList * orig = cls;
3059 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3060 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&orig->id),
3061 "confirm_or_drop_neighboUr");
3062 disconnect_neighbour (orig, GNUNET_NO);
3068 * Handle a request to start a blacklist.
3070 * @param cls closure (always NULL)
3071 * @param client identification of the client
3072 * @param message the actual message
3075 handle_blacklist_init (void *cls,
3076 struct GNUNET_SERVER_Client *client,
3077 const struct GNUNET_MessageHeader *message)
3079 struct Blacklisters *bl;
3080 struct BlacklistCheck *bc;
3081 struct NeighbourList *n;
3086 if (bl->client == client)
3089 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3094 bl = GNUNET_malloc (sizeof (struct Blacklisters));
3095 bl->client = client;
3096 GNUNET_SERVER_client_keep (client);
3097 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
3098 /* confirm that all existing connections are OK! */
3102 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3103 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3105 bc->do_hello = GNUNET_NO;
3106 bc->cont = &confirm_or_drop_neighbour;
3109 if (n == neighbours) /* all would wait for the same client, no need to
3110 create more than just the first task right now */
3111 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3119 * Handle a request to blacklist a peer.
3121 * @param cls closure (always NULL)
3122 * @param client identification of the client
3123 * @param message the actual message
3126 handle_blacklist_reply (void *cls,
3127 struct GNUNET_SERVER_Client *client,
3128 const struct GNUNET_MessageHeader *message)
3130 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
3131 struct Blacklisters *bl;
3132 struct BlacklistCheck *bc;
3135 while ( (bl != NULL) &&
3136 (bl->client != client) )
3140 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3145 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
3147 bc->cont (bc->cont_cls, NULL);
3148 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
3153 bc->bl_pos = bc->bl_pos->next;
3154 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3157 /* check if any other bc's are waiting for this blacklister */
3161 if ( (bc->bl_pos == bl) &&
3162 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
3163 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3171 * Send periodic PING messages to a given foreign address.
3173 * @param cls our 'struct PeriodicValidationContext*'
3174 * @param tc task context
3177 send_periodic_ping (void *cls,
3178 const struct GNUNET_SCHEDULER_TaskContext *tc)
3180 struct ForeignAddressList *peer_address = cls;
3181 struct TransportPlugin *tp;
3182 struct ValidationEntry *va;
3183 struct NeighbourList *neighbour;
3184 struct TransportPingMessage ping;
3185 struct CheckAddressExistsClosure caec;
3187 uint16_t hello_size;
3191 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3192 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3194 tp = peer_address->ready_list->plugin;
3195 neighbour = peer_address->ready_list->neighbour;
3196 if (GNUNET_YES != neighbour->public_key_valid)
3198 /* no public key yet, try again later */
3199 schedule_next_ping (peer_address);
3202 caec.addr = peer_address->addr;
3203 caec.addrlen = peer_address->addrlen;
3204 caec.tname = tp->short_name;
3205 caec.session = peer_address->session;
3206 caec.exists = GNUNET_NO;
3207 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3208 &check_address_exists,
3210 if (caec.exists == GNUNET_YES)
3212 /* During validation attempts we will likely trigger the other
3213 peer trying to validate our address which in turn will cause
3214 it to send us its HELLO, so we expect to hit this case rather
3215 frequently. Only print something if we are very verbose. */
3216 #if DEBUG_TRANSPORT > 1
3217 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3218 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3219 (peer_address->addr != NULL)
3220 ? a2s (tp->short_name,
3222 peer_address->addrlen)
3225 GNUNET_i2s (&neighbour->id));
3227 schedule_next_ping (peer_address);
3230 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3231 va->transport_name = GNUNET_strdup (tp->short_name);
3232 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
3234 va->send_time = GNUNET_TIME_absolute_get();
3235 va->session = peer_address->session;
3236 if (peer_address->addr != NULL)
3238 va->addr = (const void*) &va[1];
3239 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3240 va->addrlen = peer_address->addrlen;
3242 memcpy(&va->publicKey,
3243 &neighbour->publicKey,
3244 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3246 va->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_VERIFICATION_TIMEOUT,
3247 &timeout_hello_validation,
3249 GNUNET_CONTAINER_multihashmap_put (validation_map,
3250 &neighbour->id.hashPubKey,
3252 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3254 if (peer_address->validated != GNUNET_YES)
3255 hello_size = GNUNET_HELLO_size(our_hello);
3259 tsize = sizeof(struct TransportPingMessage) + hello_size;
3261 if (peer_address->addr != NULL)
3263 slen = strlen (tp->short_name) + 1;
3264 tsize += slen + peer_address->addrlen;
3268 slen = 0; /* make gcc happy */
3270 message_buf = GNUNET_malloc(tsize);
3271 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3272 ping.challenge = htonl(va->challenge);
3273 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3274 if (peer_address->validated != GNUNET_YES)
3276 memcpy(message_buf, our_hello, hello_size);
3279 if (peer_address->addr != NULL)
3281 ping.header.size = htons(sizeof(struct TransportPingMessage) +
3282 peer_address->addrlen +
3284 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3287 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3289 peer_address->addrlen);
3293 ping.header.size = htons(sizeof(struct TransportPingMessage));
3296 memcpy(&message_buf[hello_size],
3298 sizeof(struct TransportPingMessage));
3300 #if DEBUG_TRANSPORT_REVALIDATION
3301 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3302 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s'\n",
3303 (peer_address->addr != NULL)
3304 ? a2s (peer_address->plugin->short_name,
3306 peer_address->addrlen)
3309 GNUNET_i2s (&neighbour->id),
3310 "HELLO", hello_size,
3313 if (peer_address->validated != GNUNET_YES)
3314 GNUNET_STATISTICS_update (stats,
3315 gettext_noop ("# PING with HELLO messages sent"),
3319 GNUNET_STATISTICS_update (stats,
3320 gettext_noop ("# PING without HELLO messages sent"),
3323 GNUNET_STATISTICS_update (stats,
3324 gettext_noop ("# PING messages sent for re-validation"),
3327 transmit_to_peer (NULL, peer_address,
3328 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3329 HELLO_VERIFICATION_TIMEOUT,
3331 GNUNET_YES, neighbour);
3332 GNUNET_free(message_buf);
3333 schedule_next_ping (peer_address);
3338 * Schedule the job that will cause us to send a PING to the
3339 * foreign address to evaluate its validity and latency.
3341 * @param fal address to PING
3344 schedule_next_ping (struct ForeignAddressList *fal)
3346 struct GNUNET_TIME_Relative delay;
3348 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3350 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3351 delay.rel_value /= 2; /* do before expiration */
3352 delay = GNUNET_TIME_relative_min (delay,
3353 LATENCY_EVALUATION_MAX_DELAY);
3354 if (GNUNET_YES != fal->estimated)
3356 delay = GNUNET_TIME_UNIT_ZERO;
3357 fal->estimated = GNUNET_YES;
3359 if (GNUNET_YES == fal->connected)
3361 delay = GNUNET_TIME_relative_min (delay,
3362 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3364 /* FIXME: also adjust delay based on how close the last
3365 observed latency is to the latency of the best alternative */
3366 /* bound how fast we can go */
3367 delay = GNUNET_TIME_relative_max (delay,
3368 GNUNET_TIME_UNIT_SECONDS);
3369 /* randomize a bit (to avoid doing all at the same time) */
3370 delay.rel_value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3371 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(delay,
3372 &send_periodic_ping,
3380 * Function that will be called if we receive some payload
3381 * from another peer.
3383 * @param message the payload
3384 * @param n peer who claimed to be the sender
3387 handle_payload_message (const struct GNUNET_MessageHeader *message,
3388 struct NeighbourList *n)
3390 struct InboundMessage *im;
3391 struct TransportClient *cpos;
3394 msize = ntohs (message->size);
3395 if (n->received_pong == GNUNET_NO)
3397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3398 "Received message of type %u and size %u from `%4s', but no pong yet!!\n",
3399 ntohs (message->type),
3400 ntohs (message->size),
3401 GNUNET_i2s (&n->id));
3402 GNUNET_free_non_null (n->pre_connect_message_buffer);
3403 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3404 memcpy (n->pre_connect_message_buffer, message, msize);
3409 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3410 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
3411 ntohs (message->type),
3412 ntohs (message->size),
3413 GNUNET_i2s (&n->id));
3415 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3418 n->quota_violation_count++;
3420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3421 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3422 n->in_tracker.available_bytes_per_s__,
3423 n->quota_violation_count);
3425 /* Discount 32k per violation */
3426 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3431 if (n->quota_violation_count > 0)
3433 /* try to add 32k back */
3434 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3436 n->quota_violation_count--;
3439 GNUNET_STATISTICS_update (stats,
3440 gettext_noop ("# payload received from other peers"),
3443 /* transmit message to all clients */
3444 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3445 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3446 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3447 im->latency = GNUNET_TIME_relative_hton (n->latency);
3449 im->distance = ntohl(n->distance);
3450 memcpy (&im[1], message, msize);
3452 while (cpos != NULL)
3454 transmit_to_client (cpos, &im->header, GNUNET_YES);
3462 * Iterator over hash map entries. Checks if the given validation
3463 * entry is for the same challenge as what is given in the PONG.
3465 * @param cls the 'struct TransportPongMessage*'
3466 * @param key peer identity
3467 * @param value value in the hash map ('struct ValidationEntry')
3468 * @return GNUNET_YES if we should continue to
3469 * iterate (mismatch), GNUNET_NO if not (entry matched)
3472 check_pending_validation (void *cls,
3473 const GNUNET_HashCode * key,
3476 const struct TransportPongMessage *pong = cls;
3477 struct ValidationEntry *ve = value;
3478 struct AddValidatedAddressContext avac;
3479 unsigned int challenge = ntohl(pong->challenge);
3480 struct GNUNET_HELLO_Message *hello;
3481 struct GNUNET_PeerIdentity target;
3482 struct NeighbourList *n;
3483 struct ForeignAddressList *fal;
3484 struct OwnAddressList *oal;
3485 struct TransportPlugin *tp;
3486 struct GNUNET_MessageHeader *prem;
3492 ps = ntohs (pong->header.size);
3493 if (ps < sizeof (struct TransportPongMessage))
3495 GNUNET_break_op (0);
3498 addr = (const char*) &pong[1];
3499 slen = strlen (ve->transport_name) + 1;
3500 if ( (ps - sizeof (struct TransportPongMessage) < slen) ||
3501 (ve->challenge != challenge) ||
3502 (addr[slen-1] != '\0') ||
3503 (0 != strcmp (addr, ve->transport_name)) ||
3504 (ntohl (pong->purpose.size)
3505 != sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3507 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3508 sizeof (struct GNUNET_PeerIdentity) + ps - sizeof (struct TransportPongMessage)) )
3513 alen = ps - sizeof (struct TransportPongMessage) - slen;
3514 switch (ntohl (pong->purpose.purpose))
3516 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN:
3517 if ( (ve->addrlen + slen != ntohl (pong->addrlen)) ||
3518 (0 != memcmp (&addr[slen],
3522 return GNUNET_YES; /* different entry, keep trying! */
3524 if (0 != memcmp (&pong->pid,
3526 sizeof (struct GNUNET_PeerIdentity)))
3528 GNUNET_break_op (0);
3532 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
3537 GNUNET_break_op (0);
3542 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3543 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
3545 a2s (ve->transport_name,
3546 (const struct sockaddr *) ve->addr,
3548 ve->transport_name);
3551 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING:
3552 if (0 != memcmp (&pong->pid,
3554 sizeof (struct GNUNET_PeerIdentity)))
3556 GNUNET_break_op (0);
3559 if (ve->addrlen != 0)
3561 /* must have been for a different validation entry */
3564 tp = find_transport (ve->transport_name);
3570 oal = tp->addresses;
3573 if ( (oal->addrlen == alen) &&
3574 (0 == memcmp (&oal[1],
3582 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3583 _("Not accepting PONG with address `%s' since I cannot confirm having this address.\n"),
3584 a2s (ve->transport_name,
3590 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING,
3595 GNUNET_break_op (0);
3600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3601 "Confirmed that peer `%4s' is talking to us using address `%s' (%s) for us.\n",
3603 a2s (ve->transport_name,
3606 ve->transport_name);
3610 GNUNET_break_op (0);
3613 if (GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value == 0)
3615 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3616 _("Received expired signature. Check system time.\n"));
3619 GNUNET_STATISTICS_update (stats,
3620 gettext_noop ("# address validation successes"),
3623 /* create the updated HELLO */
3624 GNUNET_CRYPTO_hash (&ve->publicKey,
3625 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3626 &target.hashPubKey);
3627 if (ve->addr != NULL)
3629 avac.done = GNUNET_NO;
3631 hello = GNUNET_HELLO_create (&ve->publicKey,
3632 &add_validated_address,
3634 GNUNET_PEERINFO_add_peer (peerinfo,
3636 GNUNET_free (hello);
3638 n = find_neighbour (&target);
3641 n->publicKey = ve->publicKey;
3642 n->public_key_valid = GNUNET_YES;
3643 fal = add_peer_address (n,
3648 GNUNET_assert (fal != NULL);
3649 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
3650 fal->validated = GNUNET_YES;
3651 mark_address_connected (fal);
3652 GNUNET_STATISTICS_update (stats,
3653 gettext_noop ("# peer addresses considered valid"),
3656 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
3657 schedule_next_ping (fal);
3658 if (n->latency.rel_value == GNUNET_TIME_UNIT_FOREVER_REL.rel_value)
3659 n->latency = fal->latency;
3661 n->latency.rel_value = (fal->latency.rel_value + n->latency.rel_value) / 2;
3663 n->distance = fal->distance;
3664 if (GNUNET_NO == n->received_pong)
3666 n->received_pong = GNUNET_YES;
3667 notify_clients_connect (&target, n->latency, n->distance);
3668 if (NULL != (prem = n->pre_connect_message_buffer))
3670 n->pre_connect_message_buffer = NULL;
3671 handle_payload_message (prem, n);
3675 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3677 GNUNET_SCHEDULER_cancel (n->retry_task);
3678 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3679 try_transmission_to_peer (n);
3683 /* clean up validation entry */
3684 GNUNET_assert (GNUNET_YES ==
3685 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3688 abort_validation (NULL, NULL, ve);
3694 * Function that will be called if we receive a validation
3695 * of an address challenge that we transmitted to another
3696 * peer. Note that the validation should only be considered
3697 * acceptable if the challenge matches AND if the sender
3698 * address is at least a plausible address for this peer
3699 * (otherwise we may be seeing a MiM attack).
3701 * @param cls closure
3702 * @param message the pong message
3703 * @param peer who responded to our challenge
3704 * @param sender_address string describing our sender address (as observed
3705 * by the other peer in binary format)
3706 * @param sender_address_len number of bytes in 'sender_address'
3709 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3710 const struct GNUNET_PeerIdentity *peer,
3711 const char *sender_address,
3712 size_t sender_address_len)
3714 #if DEBUG_TRANSPORT > 1
3715 /* we get tons of these that just get discarded, only log
3716 if we are quite verbose */
3717 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3718 "Receiving `%s' message from `%4s'.\n", "PONG",
3721 GNUNET_STATISTICS_update (stats,
3722 gettext_noop ("# PONG messages received"),
3725 if (GNUNET_SYSERR !=
3726 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3728 &check_pending_validation,
3731 /* This is *expected* to happen a lot since we send
3732 PONGs to *all* known addresses of the sender of
3733 the PING, so most likely we get multiple PONGs
3734 per PING, and all but the first PONG will end up
3735 here. So really we should not print anything here
3736 unless we want to be very, very verbose... */
3737 #if DEBUG_TRANSPORT > 2
3738 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3739 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3751 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3753 * @param cls the 'struct ValidationEntry*'
3754 * @param neighbour neighbour to validate, NULL if validation failed
3757 transmit_hello_and_ping (void *cls,
3758 struct NeighbourList *neighbour)
3760 struct ValidationEntry *va = cls;
3761 struct ForeignAddressList *peer_address;
3762 struct TransportPingMessage ping;
3763 uint16_t hello_size;
3766 struct GNUNET_PeerIdentity id;
3769 GNUNET_CRYPTO_hash (&va->publicKey,
3770 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3772 if (neighbour == NULL)
3774 /* FIXME: stats... */
3775 GNUNET_break (GNUNET_OK ==
3776 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3779 abort_validation (NULL, NULL, va);
3782 neighbour->publicKey = va->publicKey;
3783 neighbour->public_key_valid = GNUNET_YES;
3784 peer_address = add_peer_address (neighbour,
3785 va->transport_name, NULL,
3786 (const void*) &va[1],
3788 if (peer_address == NULL)
3790 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3791 "Failed to add peer `%4s' for plugin `%s'\n",
3792 GNUNET_i2s (&neighbour->id),
3793 va->transport_name);
3794 GNUNET_break (GNUNET_OK ==
3795 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3798 abort_validation (NULL, NULL, va);
3801 hello_size = GNUNET_HELLO_size(our_hello);
3802 slen = strlen(va->transport_name) + 1;
3803 tsize = sizeof(struct TransportPingMessage) + hello_size + va->addrlen + slen;
3804 message_buf = GNUNET_malloc(tsize);
3805 ping.challenge = htonl(va->challenge);
3806 ping.header.size = htons(sizeof(struct TransportPingMessage) + slen + va->addrlen);
3807 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3808 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3809 memcpy(message_buf, our_hello, hello_size);
3810 memcpy(&message_buf[hello_size],
3812 sizeof(struct TransportPingMessage));
3813 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3816 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3821 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3824 : a2s (va->transport_name,
3825 (const void*) &va[1], va->addrlen),
3827 GNUNET_i2s (&neighbour->id),
3828 "HELLO", hello_size,
3829 "PING", sizeof (struct TransportPingMessage) + va->addrlen + slen);
3832 GNUNET_STATISTICS_update (stats,
3833 gettext_noop ("# PING messages sent for initial validation"),
3836 transmit_to_peer (NULL, peer_address,
3837 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3838 HELLO_VERIFICATION_TIMEOUT,
3840 GNUNET_YES, neighbour);
3841 GNUNET_free(message_buf);
3846 * Check if the given address is already being validated; if not,
3847 * append the given address to the list of entries that are being be
3848 * validated and initiate validation.
3850 * @param cls closure ('struct CheckHelloValidatedContext *')
3851 * @param tname name of the transport
3852 * @param expiration expiration time
3853 * @param addr the address
3854 * @param addrlen length of the address
3855 * @return GNUNET_OK (always)
3858 run_validation (void *cls,
3860 struct GNUNET_TIME_Absolute expiration,
3864 struct CheckHelloValidatedContext *chvc = cls;
3865 struct GNUNET_PeerIdentity id;
3866 struct TransportPlugin *tp;
3867 struct ValidationEntry *va;
3868 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3869 struct CheckAddressExistsClosure caec;
3870 struct OwnAddressList *oal;
3872 GNUNET_assert (addr != NULL);
3874 GNUNET_STATISTICS_update (stats,
3875 gettext_noop ("# peer addresses scheduled for validation"),
3878 tp = find_transport (tname);
3881 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3882 GNUNET_ERROR_TYPE_BULK,
3884 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3886 GNUNET_STATISTICS_update (stats,
3887 gettext_noop ("# peer addresses not validated (plugin not available)"),
3892 /* check if this is one of our own addresses */
3893 oal = tp->addresses;
3896 if ( (oal->addrlen == addrlen) &&
3897 (0 == memcmp (&oal[1],
3901 /* not plausible, this address is equivalent to our own address! */
3902 GNUNET_STATISTICS_update (stats,
3903 gettext_noop ("# peer addresses not validated (loopback)"),
3910 GNUNET_HELLO_get_key (chvc->hello, &pk);
3911 GNUNET_CRYPTO_hash (&pk,
3913 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3916 if (is_blacklisted(&id, tp))
3919 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3920 "Attempted to validate blacklisted peer `%s' using `%s'!\n",
3928 caec.addrlen = addrlen;
3929 caec.session = NULL;
3931 caec.exists = GNUNET_NO;
3932 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3933 &check_address_exists,
3935 if (caec.exists == GNUNET_YES)
3937 /* During validation attempts we will likely trigger the other
3938 peer trying to validate our address which in turn will cause
3939 it to send us its HELLO, so we expect to hit this case rather
3940 frequently. Only print something if we are very verbose. */
3941 #if DEBUG_TRANSPORT > 1
3942 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3943 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3944 a2s (tname, addr, addrlen),
3948 GNUNET_STATISTICS_update (stats,
3949 gettext_noop ("# peer addresses not validated (in progress)"),
3954 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
3957 va->transport_name = GNUNET_strdup (tname);
3958 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
3960 va->send_time = GNUNET_TIME_absolute_get();
3961 va->addr = (const void*) &va[1];
3962 memcpy (&va[1], addr, addrlen);
3963 va->addrlen = addrlen;
3964 GNUNET_HELLO_get_key (chvc->hello,
3966 va->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_VERIFICATION_TIMEOUT,
3967 &timeout_hello_validation,
3969 GNUNET_CONTAINER_multihashmap_put (validation_map,
3972 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3973 setup_peer_check_blacklist (&id, GNUNET_NO,
3974 &transmit_hello_and_ping,
3981 * Check if addresses in validated hello "h" overlap with
3982 * those in "chvc->hello" and validate the rest.
3984 * @param cls closure
3985 * @param peer id of the peer, NULL for last call
3986 * @param h hello message for the peer (can be NULL)
3989 check_hello_validated (void *cls,
3990 const struct GNUNET_PeerIdentity *peer,
3991 const struct GNUNET_HELLO_Message *h)
3993 struct CheckHelloValidatedContext *chvc = cls;
3994 struct GNUNET_HELLO_Message *plain_hello;
3995 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3996 struct GNUNET_PeerIdentity target;
3997 struct NeighbourList *n;
4001 GNUNET_STATISTICS_update (stats,
4002 gettext_noop ("# outstanding peerinfo iterate requests"),
4006 if (GNUNET_NO == chvc->hello_known)
4008 /* notify PEERINFO about the peer now, so that we at least
4009 have the public key if some other component needs it */
4010 GNUNET_HELLO_get_key (chvc->hello, &pk);
4011 GNUNET_CRYPTO_hash (&pk,
4012 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4013 &target.hashPubKey);
4014 plain_hello = GNUNET_HELLO_create (&pk,
4017 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
4018 GNUNET_free (plain_hello);
4019 #if DEBUG_TRANSPORT_HELLO
4020 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4021 "PEERINFO had no `%s' message for peer `%4s', full validation needed.\n",
4023 GNUNET_i2s (&target));
4025 GNUNET_STATISTICS_update (stats,
4026 gettext_noop ("# new HELLOs requiring full validation"),
4029 GNUNET_HELLO_iterate_addresses (chvc->hello,
4036 GNUNET_STATISTICS_update (stats,
4037 gettext_noop ("# duplicate HELLO (peer known)"),
4042 if (chvc->ve_count == 0)
4044 GNUNET_CONTAINER_DLL_remove (chvc_head,
4053 #if DEBUG_TRANSPORT_HELLO
4054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4055 "PEERINFO had `%s' message for peer `%4s', validating only new addresses.\n",
4059 chvc->hello_known = GNUNET_YES;
4060 n = find_neighbour (peer);
4063 #if DEBUG_TRANSPORT_HELLO
4064 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4065 "Calling hello_iterate_addresses for %s!\n",
4068 GNUNET_HELLO_iterate_addresses (h,
4070 &add_to_foreign_address_list,
4072 try_transmission_to_peer (n);
4076 #if DEBUG_TRANSPORT_HELLO
4077 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4078 "No existing neighbor record for %s!\n",
4081 GNUNET_STATISTICS_update (stats,
4082 gettext_noop ("# no existing neighbour record (validating HELLO)"),
4086 GNUNET_STATISTICS_update (stats,
4087 gettext_noop ("# HELLO validations (update case)"),
4090 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
4092 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
4099 * Process HELLO-message.
4101 * @param plugin transport involved, may be NULL
4102 * @param message the actual message
4103 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
4106 process_hello (struct TransportPlugin *plugin,
4107 const struct GNUNET_MessageHeader *message)
4110 struct GNUNET_PeerIdentity target;
4111 const struct GNUNET_HELLO_Message *hello;
4112 struct CheckHelloValidatedContext *chvc;
4113 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
4114 #if DEBUG_TRANSPORT_HELLO > 2
4117 hsize = ntohs (message->size);
4118 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
4119 (hsize < sizeof (struct GNUNET_MessageHeader)))
4122 return GNUNET_SYSERR;
4124 GNUNET_STATISTICS_update (stats,
4125 gettext_noop ("# HELLOs received for validation"),
4129 /* first, check if load is too high */
4130 if (GNUNET_SCHEDULER_get_load (GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
4132 GNUNET_STATISTICS_update (stats,
4133 gettext_noop ("# HELLOs ignored due to high load"),
4136 #if DEBUG_TRANSPORT_HELLO
4137 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4138 "Ignoring `%s' for `%4s', load too high.\n",
4140 GNUNET_i2s (&target));
4144 hello = (const struct GNUNET_HELLO_Message *) message;
4145 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
4147 #if DEBUG_TRANSPORT_HELLO
4148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4149 "Unable to get public key from `%s' for `%4s'!\n",
4151 GNUNET_i2s (&target));
4153 GNUNET_break_op (0);
4154 return GNUNET_SYSERR;
4157 GNUNET_CRYPTO_hash (&publicKey,
4158 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4159 &target.hashPubKey);
4161 #if DEBUG_TRANSPORT_HELLO
4162 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4163 "Received `%s' message for `%4s'\n",
4165 GNUNET_i2s (&target));
4168 if (0 == memcmp (&my_identity,
4170 sizeof (struct GNUNET_PeerIdentity)))
4172 GNUNET_STATISTICS_update (stats,
4173 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
4179 while (NULL != chvc)
4181 if (GNUNET_HELLO_equals (hello,
4183 GNUNET_TIME_absolute_get ()).abs_value > 0)
4185 #if DEBUG_TRANSPORT_HELLO > 2
4186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4187 "Received duplicate `%s' message for `%4s'; ignored\n",
4189 GNUNET_i2s (&target));
4191 return GNUNET_OK; /* validation already pending */
4193 if (GNUNET_HELLO_size(hello) == GNUNET_HELLO_size (chvc->hello))
4194 GNUNET_break (0 != memcmp (hello, chvc->hello,
4195 GNUNET_HELLO_size(hello)));
4200 struct NeighbourList *temp_neighbor = find_neighbour(&target);
4201 if ((NULL != temp_neighbor))
4203 fprintf(stderr, "Already know peer, ignoring hello\n");
4208 #if DEBUG_TRANSPORT_HELLO > 2
4211 my_id = GNUNET_strdup(GNUNET_i2s(plugin->env.my_identity));
4212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4213 "%s: Starting validation of `%s' message for `%4s' via '%s' of size %u\n",
4216 GNUNET_i2s (&target),
4218 GNUNET_HELLO_size(hello));
4222 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
4224 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
4225 memcpy (&chvc[1], hello, hsize);
4226 GNUNET_CONTAINER_DLL_insert (chvc_head,
4229 /* finally, check if HELLO was previously validated
4230 (continuation will then schedule actual validation) */
4231 GNUNET_STATISTICS_update (stats,
4232 gettext_noop ("# peerinfo process hello iterate requests"),
4235 GNUNET_STATISTICS_update (stats,
4236 gettext_noop ("# outstanding peerinfo iterate requests"),
4239 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
4241 HELLO_VERIFICATION_TIMEOUT,
4242 &check_hello_validated, chvc);
4248 * The peer specified by the given neighbour has timed-out or a plugin
4249 * has disconnected. We may either need to do nothing (other plugins
4250 * still up), or trigger a full disconnect and clean up. This
4251 * function updates our state and does the necessary notifications.
4252 * Also notifies our clients that the neighbour is now officially
4255 * @param n the neighbour list entry for the peer
4256 * @param check GNUNET_YES to check if ALL addresses for this peer
4257 * are gone, GNUNET_NO to force a disconnect of the peer
4258 * regardless of whether other addresses exist.
4261 disconnect_neighbour (struct NeighbourList *n, int check)
4263 struct ReadyList *rpos;
4264 struct NeighbourList *npos;
4265 struct NeighbourList *nprev;
4266 struct MessageQueue *mq;
4267 struct ForeignAddressList *peer_addresses;
4268 struct ForeignAddressList *peer_pos;
4270 if (GNUNET_YES == check)
4273 while (NULL != rpos)
4275 peer_addresses = rpos->addresses;
4276 while (peer_addresses != NULL)
4278 if (GNUNET_YES == peer_addresses->connected)
4280 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4281 "NOT Disconnecting from `%4s', still have live addresses!\n",
4282 GNUNET_i2s (&n->id));
4283 return; /* still connected */
4285 peer_addresses = peer_addresses->next;
4291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4292 "Disconnecting from `%4s'\n",
4293 GNUNET_i2s (&n->id));
4295 /* remove n from neighbours list */
4298 while ((npos != NULL) && (npos != n))
4303 GNUNET_assert (npos != NULL);
4305 neighbours = n->next;
4307 nprev->next = n->next;
4309 /* notify all clients about disconnect */
4310 if (GNUNET_YES == n->received_pong)
4311 notify_clients_disconnect (&n->id);
4313 /* clean up all plugins, cancel connections and pending transmissions */
4314 while (NULL != (rpos = n->plugins))
4316 n->plugins = rpos->next;
4317 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
4318 while (rpos->addresses != NULL)
4320 peer_pos = rpos->addresses;
4321 rpos->addresses = peer_pos->next;
4322 if (peer_pos->connected == GNUNET_YES)
4323 GNUNET_STATISTICS_update (stats,
4324 gettext_noop ("# connected addresses"),
4327 if (GNUNET_YES == peer_pos->validated)
4328 GNUNET_STATISTICS_update (stats,
4329 gettext_noop ("# peer addresses considered valid"),
4332 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
4334 GNUNET_SCHEDULER_cancel (peer_pos->revalidate_task);
4335 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
4337 GNUNET_free(peer_pos);
4342 /* free all messages on the queue */
4343 while (NULL != (mq = n->messages_head))
4345 GNUNET_STATISTICS_update (stats,
4346 gettext_noop ("# bytes in message queue for other peers"),
4347 - (int64_t) mq->message_buf_size,
4349 GNUNET_STATISTICS_update (stats,
4350 gettext_noop ("# bytes discarded due to disconnect"),
4351 mq->message_buf_size,
4353 GNUNET_CONTAINER_DLL_remove (n->messages_head,
4356 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
4358 sizeof(struct GNUNET_PeerIdentity)));
4361 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
4363 GNUNET_SCHEDULER_cancel (n->timeout_task);
4364 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
4366 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
4368 GNUNET_SCHEDULER_cancel (n->retry_task);
4369 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
4371 if (n->piter != NULL)
4373 GNUNET_PEERINFO_iterate_cancel (n->piter);
4374 GNUNET_STATISTICS_update (stats,
4375 gettext_noop ("# outstanding peerinfo iterate requests"),
4380 /* finally, free n itself */
4381 GNUNET_STATISTICS_update (stats,
4382 gettext_noop ("# active neighbours"),
4385 GNUNET_free_non_null (n->pre_connect_message_buffer);
4391 * We have received a PING message from someone. Need to send a PONG message
4392 * in response to the peer by any means necessary.
4395 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
4396 const struct GNUNET_PeerIdentity *peer,
4397 struct Session *session,
4398 const char *sender_address,
4399 uint16_t sender_address_len)
4401 struct TransportPlugin *plugin = cls;
4402 struct SessionHeader *session_header = (struct SessionHeader*) session;
4403 struct TransportPingMessage *ping;
4404 struct TransportPongMessage *pong;
4405 struct NeighbourList *n;
4406 struct ReadyList *rl;
4407 struct ForeignAddressList *fal;
4408 struct OwnAddressList *oal;
4413 if (ntohs (message->size) < sizeof (struct TransportPingMessage))
4415 GNUNET_break_op (0);
4416 return GNUNET_SYSERR;
4419 ping = (struct TransportPingMessage *) message;
4420 if (0 != memcmp (&ping->target,
4421 plugin->env.my_identity,
4422 sizeof (struct GNUNET_PeerIdentity)))
4424 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4425 _("Received `%s' message from `%s' destined for `%s' which is not me!\n"),
4427 (sender_address != NULL)
4428 ? a2s (plugin->short_name,
4429 (const struct sockaddr *)sender_address,
4432 GNUNET_i2s (&ping->target));
4433 return GNUNET_SYSERR;
4436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4437 "Processing `%s' from `%s'\n",
4439 (sender_address != NULL)
4440 ? a2s (plugin->short_name,
4441 (const struct sockaddr *)sender_address,
4445 GNUNET_STATISTICS_update (stats,
4446 gettext_noop ("# PING messages received"),
4449 addr = (const char*) &ping[1];
4450 alen = ntohs (message->size) - sizeof (struct TransportPingMessage);
4451 slen = strlen (plugin->short_name) + 1;
4454 /* peer wants to confirm that we have an outbound connection to him */
4455 if (session == NULL)
4457 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4458 _("Refusing to create PONG since I do not have a session with `%s'.\n"),
4460 return GNUNET_SYSERR;
4462 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4463 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4464 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4465 pong->purpose.size =
4466 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4468 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4469 sizeof (struct GNUNET_PeerIdentity) + sender_address_len + slen);
4470 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING);
4471 pong->challenge = ping->challenge;
4472 pong->addrlen = htonl(sender_address_len + slen);
4475 sizeof(struct GNUNET_PeerIdentity));
4479 memcpy (&((char*)&pong[1])[slen],
4481 sender_address_len);
4482 if (GNUNET_TIME_absolute_get_remaining (session_header->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4)
4484 /* create / update cached sig */
4486 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4487 "Creating PONG signature to indicate active connection.\n");
4489 session_header->pong_sig_expires = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
4490 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4491 GNUNET_assert (GNUNET_OK ==
4492 GNUNET_CRYPTO_rsa_sign (my_private_key,
4494 &session_header->pong_signature));
4498 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4500 memcpy (&pong->signature,
4501 &session_header->pong_signature,
4502 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4508 /* peer wants to confirm that this is one of our addresses */
4512 plugin->api->check_address (plugin->api->cls,
4516 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4517 _("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
4518 a2s (plugin->short_name,
4523 oal = plugin->addresses;
4526 if ( (oal->addrlen == alen) &&
4533 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
4534 pong->header.size = htons (sizeof (struct TransportPongMessage) + alen + slen);
4535 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4536 pong->purpose.size =
4537 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4539 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4540 sizeof (struct GNUNET_PeerIdentity) + alen + slen);
4541 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
4542 pong->challenge = ping->challenge;
4543 pong->addrlen = htonl(alen + slen);
4546 sizeof(struct GNUNET_PeerIdentity));
4547 memcpy (&pong[1], plugin->short_name, slen);
4548 memcpy (&((char*)&pong[1])[slen], addr, alen);
4549 if ( (oal != NULL) &&
4550 (GNUNET_TIME_absolute_get_remaining (oal->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4) )
4552 /* create / update cached sig */
4554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4555 "Creating PONG signature to indicate ownership.\n");
4557 oal->pong_sig_expires = GNUNET_TIME_absolute_min (oal->expires,
4558 GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4559 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4560 GNUNET_assert (GNUNET_OK ==
4561 GNUNET_CRYPTO_rsa_sign (my_private_key,
4563 &oal->pong_signature));
4564 memcpy (&pong->signature,
4565 &oal->pong_signature,
4566 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4568 else if (oal == NULL)
4570 /* not using cache (typically DV-only) */
4571 pong->expiration = GNUNET_TIME_absolute_hton (GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4572 GNUNET_assert (GNUNET_OK ==
4573 GNUNET_CRYPTO_rsa_sign (my_private_key,
4579 /* can used cached version */
4580 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4581 memcpy (&pong->signature,
4582 &oal->pong_signature,
4583 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4586 n = find_neighbour(peer);
4587 GNUNET_assert (n != NULL);
4588 /* first try reliable response transmission */
4592 fal = rl->addresses;
4595 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4598 ntohs (pong->header.size),
4599 TRANSPORT_PONG_PRIORITY,
4600 HELLO_VERIFICATION_TIMEOUT,
4608 GNUNET_STATISTICS_update (stats,
4609 gettext_noop ("# PONGs unicast via reliable transport"),
4619 /* no reliable method found, do multicast */
4620 GNUNET_STATISTICS_update (stats,
4621 gettext_noop ("# PONGs multicast to all available addresses"),
4627 fal = rl->addresses;
4630 transmit_to_peer(NULL, fal,
4631 TRANSPORT_PONG_PRIORITY,
4632 HELLO_VERIFICATION_TIMEOUT,
4634 ntohs(pong->header.size),
4647 * Function called by the plugin for each received message.
4648 * Update data volumes, possibly notify plugins about
4649 * reducing the rate at which they read from the socket
4650 * and generally forward to our receive callback.
4652 * @param cls the "struct TransportPlugin *" we gave to the plugin
4653 * @param peer (claimed) identity of the other peer
4654 * @param message the message, NULL if we only care about
4655 * learning about the delay until we should receive again
4656 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
4657 * @param session identifier used for this session (can be NULL)
4658 * @param sender_address binary address of the sender (if observed)
4659 * @param sender_address_len number of bytes in sender_address
4660 * @return how long in ms the plugin should wait until receiving more data
4661 * (plugins that do not support this, can ignore the return value)
4663 static struct GNUNET_TIME_Relative
4664 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4665 const struct GNUNET_MessageHeader *message,
4667 struct Session *session,
4668 const char *sender_address,
4669 uint16_t sender_address_len)
4671 struct TransportPlugin *plugin = cls;
4672 struct ReadyList *service_context;
4673 struct ForeignAddressList *peer_address;
4675 struct NeighbourList *n;
4676 struct GNUNET_TIME_Relative ret;
4677 if (is_blacklisted (peer, plugin))
4678 return GNUNET_TIME_UNIT_FOREVER_REL;
4680 n = find_neighbour (peer);
4682 n = setup_new_neighbour (peer, GNUNET_YES);
4683 service_context = n->plugins;
4684 while ((service_context != NULL) && (plugin != service_context->plugin))
4685 service_context = service_context->next;
4686 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4687 peer_address = NULL;
4688 if (message != NULL)
4690 if ( (session != NULL) ||
4691 (sender_address != NULL) )
4692 peer_address = add_peer_address (n,
4696 sender_address_len);
4697 if (peer_address != NULL)
4699 peer_address->distance = distance;
4700 if (GNUNET_YES == peer_address->validated)
4701 mark_address_connected (peer_address);
4702 peer_address->timeout
4704 GNUNET_TIME_relative_to_absolute
4705 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4706 schedule_next_ping (peer_address);
4708 /* update traffic received amount ... */
4709 msize = ntohs (message->size);
4710 GNUNET_STATISTICS_update (stats,
4711 gettext_noop ("# bytes received from other peers"),
4714 n->distance = distance;
4716 GNUNET_TIME_relative_to_absolute
4717 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4718 GNUNET_SCHEDULER_cancel (n->timeout_task);
4720 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4721 &neighbour_timeout_task, n);
4722 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4724 /* dropping message due to frequent inbound volume violations! */
4725 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4726 GNUNET_ERROR_TYPE_BULK,
4728 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4729 n->in_tracker.available_bytes_per_s__,
4730 n->quota_violation_count);
4731 GNUNET_STATISTICS_update (stats,
4732 gettext_noop ("# bandwidth quota violations by other peers"),
4735 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4740 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
4741 ntohs (message->type),
4742 ntohs (message->size),
4745 switch (ntohs (message->type))
4747 case GNUNET_MESSAGE_TYPE_HELLO:
4748 GNUNET_STATISTICS_update (stats,
4749 gettext_noop ("# HELLO messages received from other peers"),
4752 process_hello (plugin, message);
4754 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4755 handle_ping (plugin, message, peer, session, sender_address, sender_address_len);
4757 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4758 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4761 handle_payload_message (message, n);
4765 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4766 if (ret.rel_value > 0)
4768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4769 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4770 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4771 (unsigned int) n->in_tracker.available_bytes_per_s__,
4772 (unsigned long long) ret.rel_value);
4773 GNUNET_STATISTICS_update (stats,
4774 gettext_noop ("# ms throttling suggested"),
4775 (int64_t) ret.rel_value,
4782 * Handle START-message. This is the first message sent to us
4783 * by any client which causes us to add it to our list.
4785 * @param cls closure (always NULL)
4786 * @param client identification of the client
4787 * @param message the actual message
4790 handle_start (void *cls,
4791 struct GNUNET_SERVER_Client *client,
4792 const struct GNUNET_MessageHeader *message)
4794 const struct StartMessage *start;
4795 struct TransportClient *c;
4796 struct ConnectInfoMessage cim;
4797 struct NeighbourList *n;
4799 start = (const struct StartMessage*) message;
4801 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4802 "Received `%s' request from client\n", "START");
4807 if (c->client == client)
4809 /* client already on our list! */
4811 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4816 if ( (GNUNET_NO != ntohl (start->do_check)) &&
4817 (0 != memcmp (&start->self,
4819 sizeof (struct GNUNET_PeerIdentity))) )
4821 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4822 _("Rejecting control connection from peer `%s', which is not me!\n"),
4823 GNUNET_i2s (&start->self));
4824 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4827 c = GNUNET_malloc (sizeof (struct TransportClient));
4831 if (our_hello != NULL)
4834 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4835 "Sending our own `%s' to new client\n", "HELLO");
4837 transmit_to_client (c,
4838 (const struct GNUNET_MessageHeader *) our_hello,
4840 /* tell new client about all existing connections */
4841 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
4842 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4846 if (GNUNET_YES == n->received_pong)
4849 cim.latency = GNUNET_TIME_relative_hton (n->latency);
4850 cim.distance = htonl (n->distance);
4851 transmit_to_client (c, &cim.header, GNUNET_NO);
4856 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4861 * Handle HELLO-message.
4863 * @param cls closure (always NULL)
4864 * @param client identification of the client
4865 * @param message the actual message
4868 handle_hello (void *cls,
4869 struct GNUNET_SERVER_Client *client,
4870 const struct GNUNET_MessageHeader *message)
4874 GNUNET_STATISTICS_update (stats,
4875 gettext_noop ("# HELLOs received from clients"),
4878 ret = process_hello (NULL, message);
4879 GNUNET_SERVER_receive_done (client, ret);
4884 * Closure for 'transmit_client_message'; followed by
4885 * 'msize' bytes of the actual message.
4887 struct TransmitClientMessageContext
4890 * Client on whom's behalf we are sending.
4892 struct GNUNET_SERVER_Client *client;
4895 * Timeout for the transmission.
4897 struct GNUNET_TIME_Absolute timeout;
4905 * Size of the message in bytes.
4912 * Schedule transmission of a message we got from a client to a peer.
4914 * @param cls the 'struct TransmitClientMessageContext*'
4915 * @param n destination, or NULL on error (in that case, drop the message)
4918 transmit_client_message (void *cls,
4919 struct NeighbourList *n)
4921 struct TransmitClientMessageContext *tcmc = cls;
4922 struct TransportClient *tc;
4925 while ((tc != NULL) && (tc->client != tcmc->client))
4930 transmit_to_peer (tc, NULL, tcmc->priority,
4931 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
4933 tcmc->msize, GNUNET_NO, n);
4935 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
4936 GNUNET_SERVER_client_drop (tcmc->client);
4942 * Handle SEND-message.
4944 * @param cls closure (always NULL)
4945 * @param client identification of the client
4946 * @param message the actual message
4949 handle_send (void *cls,
4950 struct GNUNET_SERVER_Client *client,
4951 const struct GNUNET_MessageHeader *message)
4953 const struct OutboundMessage *obm;
4954 const struct GNUNET_MessageHeader *obmm;
4955 struct TransmitClientMessageContext *tcmc;
4959 size = ntohs (message->size);
4961 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
4964 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4967 GNUNET_STATISTICS_update (stats,
4968 gettext_noop ("# payload received for other peers"),
4971 obm = (const struct OutboundMessage *) message;
4972 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
4973 msize = size - sizeof (struct OutboundMessage);
4975 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4976 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
4977 "SEND", GNUNET_i2s (&obm->peer),
4981 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
4982 tcmc->client = client;
4983 tcmc->priority = ntohl (obm->priority);
4984 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
4985 tcmc->msize = msize;
4986 /* FIXME: this memcpy can be up to 7% of our total runtime */
4987 memcpy (&tcmc[1], obmm, msize);
4988 GNUNET_SERVER_client_keep (client);
4989 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
4990 &transmit_client_message,
4996 * Handle request connect message
4998 * @param cls closure (always NULL)
4999 * @param client identification of the client
5000 * @param message the actual message
5003 handle_request_connect (void *cls,
5004 struct GNUNET_SERVER_Client *client,
5005 const struct GNUNET_MessageHeader *message)
5007 const struct TransportRequestConnectMessage *trcm =
5008 (const struct TransportRequestConnectMessage *) message;
5010 GNUNET_STATISTICS_update (stats,
5011 gettext_noop ("# REQUEST CONNECT messages received"),
5014 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received a request connect message for peer %s\n", GNUNET_i2s(&trcm->peer));
5015 setup_peer_check_blacklist (&trcm->peer, GNUNET_YES,
5017 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5021 * Handle SET_QUOTA-message.
5023 * @param cls closure (always NULL)
5024 * @param client identification of the client
5025 * @param message the actual message
5028 handle_set_quota (void *cls,
5029 struct GNUNET_SERVER_Client *client,
5030 const struct GNUNET_MessageHeader *message)
5032 const struct QuotaSetMessage *qsm =
5033 (const struct QuotaSetMessage *) message;
5034 struct NeighbourList *n;
5036 GNUNET_STATISTICS_update (stats,
5037 gettext_noop ("# SET QUOTA messages received"),
5040 n = find_neighbour (&qsm->peer);
5043 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5044 GNUNET_STATISTICS_update (stats,
5045 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
5051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5052 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
5054 (unsigned int) ntohl (qsm->quota.value__),
5055 (unsigned int) n->in_tracker.available_bytes_per_s__,
5056 GNUNET_i2s (&qsm->peer));
5058 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
5060 if (0 == ntohl (qsm->quota.value__))
5062 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5063 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&n->id),
5065 disconnect_neighbour (n, GNUNET_NO);
5067 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5072 * Take the given address and append it to the set of results sent back to
5075 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
5076 * @param address the resolved name, NULL to indicate the last response
5079 transmit_address_to_client (void *cls, const char *address)
5081 struct GNUNET_SERVER_TransmitContext *tc = cls;
5084 if (NULL == address)
5087 slen = strlen (address) + 1;
5089 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
5090 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5091 if (NULL == address)
5092 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
5097 * Handle AddressLookup-message.
5099 * @param cls closure (always NULL)
5100 * @param client identification of the client
5101 * @param message the actual message
5104 handle_address_lookup (void *cls,
5105 struct GNUNET_SERVER_Client *client,
5106 const struct GNUNET_MessageHeader *message)
5108 const struct AddressLookupMessage *alum;
5109 struct TransportPlugin *lsPlugin;
5110 const char *nameTransport;
5111 const char *address;
5113 struct GNUNET_SERVER_TransmitContext *tc;
5114 struct GNUNET_TIME_Absolute timeout;
5115 struct GNUNET_TIME_Relative rtimeout;
5118 size = ntohs (message->size);
5119 if (size < sizeof (struct AddressLookupMessage))
5121 GNUNET_break_op (0);
5122 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5125 alum = (const struct AddressLookupMessage *) message;
5126 uint32_t addressLen = ntohl (alum->addrlen);
5127 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
5129 GNUNET_break_op (0);
5130 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5133 address = (const char *) &alum[1];
5134 nameTransport = (const char *) &address[addressLen];
5136 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
5138 GNUNET_break_op (0);
5139 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5142 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
5143 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
5144 numeric = ntohl (alum->numeric_only);
5145 lsPlugin = find_transport (nameTransport);
5146 if (NULL == lsPlugin)
5148 tc = GNUNET_SERVER_transmit_context_create (client);
5149 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
5150 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5151 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
5154 tc = GNUNET_SERVER_transmit_context_create (client);
5155 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
5157 address, addressLen,
5160 &transmit_address_to_client, tc);
5165 * Setup the environment for this plugin.
5168 create_environment (struct TransportPlugin *plug)
5170 plug->env.cfg = cfg;
5171 plug->env.my_identity = &my_identity;
5172 plug->env.our_hello = &our_hello;
5173 plug->env.cls = plug;
5174 plug->env.receive = &plugin_env_receive;
5175 plug->env.notify_address = &plugin_env_notify_address;
5176 plug->env.session_end = &plugin_env_session_end;
5177 plug->env.max_connections = max_connect_per_transport;
5178 plug->env.stats = stats;
5183 * Start the specified transport (load the plugin).
5186 start_transport (struct GNUNET_SERVER_Handle *server,
5189 struct TransportPlugin *plug;
5192 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5193 _("Loading `%s' transport plugin\n"), name);
5194 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
5195 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
5196 create_environment (plug);
5197 plug->short_name = GNUNET_strdup (name);
5198 plug->lib_name = libname;
5199 plug->next = plugins;
5201 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
5202 if (plug->api == NULL)
5204 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5205 _("Failed to load transport plugin for `%s'\n"), name);
5206 GNUNET_free (plug->short_name);
5207 plugins = plug->next;
5208 GNUNET_free (libname);
5215 * Called whenever a client is disconnected. Frees our
5216 * resources associated with that client.
5218 * @param cls closure
5219 * @param client identification of the client
5222 client_disconnect_notification (void *cls,
5223 struct GNUNET_SERVER_Client *client)
5225 struct TransportClient *pos;
5226 struct TransportClient *prev;
5227 struct ClientMessageQueueEntry *mqe;
5228 struct Blacklisters *bl;
5229 struct BlacklistCheck *bc;
5234 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
5235 "Client disconnected, cleaning up.\n");
5237 /* clean up blacklister */
5241 if (bl->client == client)
5246 if (bc->bl_pos == bl)
5248 bc->bl_pos = bl->next;
5251 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
5254 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
5255 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
5261 GNUNET_CONTAINER_DLL_remove (bl_head,
5264 GNUNET_SERVER_client_drop (bl->client);
5270 /* clean up 'normal' clients */
5273 while ((pos != NULL) && (pos->client != client))
5280 while (NULL != (mqe = pos->message_queue_head))
5282 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
5283 pos->message_queue_tail,
5285 pos->message_count--;
5289 clients = pos->next;
5291 prev->next = pos->next;
5292 if (GNUNET_YES == pos->tcs_pending)
5297 if (pos->th != NULL)
5299 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
5302 GNUNET_break (0 == pos->message_count);
5308 * Function called when the service shuts down. Unloads our plugins
5309 * and cancels pending validations.
5311 * @param cls closure, unused
5312 * @param tc task context (unused)
5315 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5317 struct TransportPlugin *plug;
5318 struct OwnAddressList *al;
5319 struct CheckHelloValidatedContext *chvc;
5321 while (neighbours != NULL)
5323 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5324 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&neighbours->id),
5326 disconnect_neighbour (neighbours, GNUNET_NO);
5329 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5330 "Transport service is unloading plugins...\n");
5332 while (NULL != (plug = plugins))
5334 plugins = plug->next;
5335 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
5337 GNUNET_SCHEDULER_cancel (plug->address_update_task);
5338 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
5340 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
5341 GNUNET_free (plug->lib_name);
5342 GNUNET_free (plug->short_name);
5343 while (NULL != (al = plug->addresses))
5345 plug->addresses = al->next;
5350 if (my_private_key != NULL)
5351 GNUNET_CRYPTO_rsa_key_free (my_private_key);
5352 GNUNET_free_non_null (our_hello);
5354 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
5357 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5358 validation_map = NULL;
5360 /* free 'chvc' data structure */
5361 while (NULL != (chvc = chvc_head))
5363 chvc_head = chvc->next;
5364 if (chvc->piter != NULL)
5366 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
5367 GNUNET_STATISTICS_update (stats,
5368 gettext_noop ("# outstanding peerinfo iterate requests"),
5374 GNUNET_assert (chvc->ve_count == 0);
5381 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5384 if (peerinfo != NULL)
5386 GNUNET_PEERINFO_disconnect (peerinfo);
5389 /* Can we assume those are gone by now, or do we need to clean up
5391 GNUNET_break (bl_head == NULL);
5392 GNUNET_break (bc_head == NULL);
5397 * Initiate transport service.
5399 * @param cls closure
5400 * @param server the initialized server
5401 * @param c configuration to use
5405 struct GNUNET_SERVER_Handle *server,
5406 const struct GNUNET_CONFIGURATION_Handle *c)
5408 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
5409 {&handle_start, NULL,
5410 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
5411 {&handle_hello, NULL,
5412 GNUNET_MESSAGE_TYPE_HELLO, 0},
5413 {&handle_send, NULL,
5414 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
5415 {&handle_request_connect, NULL,
5416 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT, sizeof(struct TransportRequestConnectMessage)},
5417 {&handle_set_quota, NULL,
5418 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
5419 {&handle_address_lookup, NULL,
5420 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
5422 {&handle_blacklist_init, NULL,
5423 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
5424 {&handle_blacklist_reply, NULL,
5425 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
5431 unsigned long long tneigh;
5435 stats = GNUNET_STATISTICS_create ("transport", cfg);
5436 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
5437 /* parse configuration */
5439 GNUNET_CONFIGURATION_get_value_number (c,
5444 GNUNET_CONFIGURATION_get_value_filename (c,
5446 "HOSTKEY", &keyfile)))
5448 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5450 ("Transport service is lacking key configuration settings. Exiting.\n"));
5451 GNUNET_SCHEDULER_shutdown ();
5454 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5457 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5458 validation_map = NULL;
5461 max_connect_per_transport = (uint32_t) tneigh;
5462 peerinfo = GNUNET_PEERINFO_connect (cfg);
5463 if (peerinfo == NULL)
5465 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5466 _("Could not access PEERINFO service. Exiting.\n"));
5467 GNUNET_SCHEDULER_shutdown ();
5470 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5473 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5474 validation_map = NULL;
5475 GNUNET_free (keyfile);
5478 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
5479 GNUNET_free (keyfile);
5480 if (my_private_key == NULL)
5482 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5484 ("Transport service could not access hostkey. Exiting.\n"));
5485 GNUNET_SCHEDULER_shutdown ();
5488 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5491 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5492 validation_map = NULL;
5495 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
5496 GNUNET_CRYPTO_hash (&my_public_key,
5497 sizeof (my_public_key), &my_identity.hashPubKey);
5498 /* setup notification */
5499 GNUNET_SERVER_disconnect_notify (server,
5500 &client_disconnect_notification, NULL);
5501 /* load plugins... */
5504 GNUNET_CONFIGURATION_get_value_string (c,
5505 "TRANSPORT", "PLUGINS", &plugs))
5507 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5508 _("Starting transport plugins `%s'\n"), plugs);
5509 pos = strtok (plugs, " ");
5512 start_transport (server, pos);
5514 pos = strtok (NULL, " ");
5516 GNUNET_free (plugs);
5518 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
5519 &shutdown_task, NULL);
5524 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
5526 /* If we have a blacklist file, read from it */
5527 read_blacklist_file(cfg);
5528 /* process client requests */
5529 GNUNET_SERVER_add_handlers (server, handlers);
5534 * The main function for the transport service.
5536 * @param argc number of arguments from the command line
5537 * @param argv command line arguments
5538 * @return 0 ok, 1 on error
5541 main (int argc, char *const *argv)
5543 a2s (NULL, NULL, 0); /* make compiler happy */
5544 return (GNUNET_OK ==
5545 GNUNET_SERVICE_run (argc,
5548 GNUNET_SERVICE_OPTION_NONE,
5549 &run, NULL)) ? 0 : 1;
5552 /* end of gnunet-service-transport.c */