2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file transport/gnunet-service-transport.c
23 * @brief low-level P2P messaging
24 * @author Christian Grothoff
28 #include "gnunet_client_lib.h"
29 #include "gnunet_container_lib.h"
30 #include "gnunet_constants.h"
31 #include "gnunet_getopt_lib.h"
32 #include "gnunet_hello_lib.h"
33 #include "gnunet_os_lib.h"
34 #include "gnunet_peerinfo_service.h"
35 #include "gnunet_plugin_lib.h"
36 #include "gnunet_protocols.h"
37 #include "gnunet_service_lib.h"
38 #include "gnunet_signatures.h"
39 #include "gnunet_transport_plugin.h"
40 #include "transport.h"
42 #define DEBUG_BLACKLIST GNUNET_YES
44 #define DEBUG_PING_PONG GNUNET_YES
46 #define DEBUG_TRANSPORT_HELLO GNUNET_YES
49 * Should we do some additional checks (to validate behavior
52 #define EXTRA_CHECKS GNUNET_YES
55 * How many messages can we have pending for a given client process
56 * before we start to drop incoming messages? We typically should
57 * have only one client and so this would be the primary buffer for
58 * messages, so the number should be chosen rather generously.
60 * The expectation here is that most of the time the queue is large
61 * enough so that a drop is virtually never required. Note that
62 * this value must be about as large as 'TOTAL_MSGS' in the
63 * 'test_transport_api_reliability.c', otherwise that testcase may
66 #define MAX_PENDING (128 * 1024)
69 * Size of the per-transport blacklist hash maps.
71 #define TRANSPORT_BLACKLIST_HT_SIZE 16
74 * How often should we try to reconnect to a peer using a particular
75 * transport plugin before giving up? Note that the plugin may be
76 * added back to the list after PLUGIN_RETRY_FREQUENCY expires.
78 #define MAX_CONNECT_RETRY 3
81 * Limit on the number of ready-to-run tasks when validating
82 * HELLOs. If more tasks are ready to run, we will drop
83 * HELLOs instead of validating them.
85 #define MAX_HELLO_LOAD 4
88 * How often must a peer violate bandwidth quotas before we start
89 * to simply drop its messages?
91 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
94 * How long until a HELLO verification attempt should time out?
95 * Must be rather small, otherwise a partially successful HELLO
96 * validation (some addresses working) might not be available
97 * before a client's request for a connection fails for good.
98 * Besides, if a single request to an address takes a long time,
99 * then the peer is unlikely worthwhile anyway.
101 #define HELLO_VERIFICATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
104 * How long is a PONG signature valid? We'll recycle a signature until
105 * 1/4 of this time is remaining. PONGs should expire so that if our
106 * external addresses change an adversary cannot replay them indefinitely.
107 * OTOH, we don't want to spend too much time generating PONG signatures,
108 * so they must have some lifetime to reduce our CPU usage.
110 #define PONG_SIGNATURE_LIFETIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
113 * Priority to use for PONG messages.
115 #define TRANSPORT_PONG_PRIORITY 4
118 * How often do we re-add (cheaper) plugins to our list of plugins
119 * to try for a given connected peer?
121 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
124 * After how long do we expire an address in a HELLO that we just
125 * validated? This value is also used for our own addresses when we
128 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
132 * How long before an existing address expires should we again try to
133 * validate it? Must be (significantly) smaller than
134 * HELLO_ADDRESS_EXPIRATION.
136 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
139 * Maximum frequency for re-evaluating latencies for all transport addresses.
141 #define LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
144 * Maximum frequency for re-evaluating latencies for connected addresses.
146 #define CONNECTED_LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 1)
150 * List of addresses of other peers
152 struct ForeignAddressList
155 * This is a linked list.
157 struct ForeignAddressList *next;
160 * Which ready list does this entry belong to.
162 struct ReadyList *ready_list;
165 * How long until we auto-expire this address (unless it is
166 * re-confirmed by the transport)?
168 struct GNUNET_TIME_Absolute expires;
171 * Task used to re-validate addresses, updates latencies and
174 GNUNET_SCHEDULER_TaskIdentifier revalidate_task;
182 * Session (or NULL if no valid session currently exists or if the
183 * plugin does not use sessions).
185 struct Session *session;
188 * What was the last latency observed for this address, plugin and peer?
190 struct GNUNET_TIME_Relative latency;
193 * If we did not successfully transmit a message to the given peer
194 * via this connection during the specified time, we should consider
195 * the connection to be dead. This is used in the case that a TCP
196 * transport simply stalls writing to the stream but does not
197 * formerly get a signal that the other peer died.
199 struct GNUNET_TIME_Absolute timeout;
202 * How often have we tried to connect using this plugin? Used to
203 * discriminate against addresses that do not work well.
204 * FIXME: not yet used, but should be!
206 unsigned int connect_attempts;
209 * DV distance to this peer (1 if no DV is used).
210 * FIXME: need to set this from transport plugins!
220 * Have we ever estimated the latency of this address? Used to
221 * ensure that the first time we add an address, we immediately
227 * Are we currently connected via this address? The first time we
228 * successfully transmit or receive data to a peer via a particular
229 * address, we set this to GNUNET_YES. If we later get an error
230 * (disconnect notification, transmission failure, timeout), we set
231 * it back to GNUNET_NO.
236 * Is this plugin currently busy transmitting to the specific target?
237 * GNUNET_NO if not (initial, default state is GNUNET_NO). Internal
238 * messages do not count as 'in transmit'.
243 * Has this address been validated yet?
251 * Entry in linked list of network addresses for ourselves. Also
252 * includes a cached signature for 'struct TransportPongMessage's.
254 struct OwnAddressList
257 * This is a linked list.
259 struct OwnAddressList *next;
262 * How long until we actually auto-expire this address (unless it is
263 * re-confirmed by the transport)?
265 struct GNUNET_TIME_Absolute expires;
268 * How long until the current signature expires? (ZERO if the
269 * signature was never created).
271 struct GNUNET_TIME_Absolute pong_sig_expires;
274 * Signature for a 'struct TransportPongMessage' for this address.
276 struct GNUNET_CRYPTO_RsaSignature pong_signature;
287 * Entry in linked list of all of our plugins.
289 struct TransportPlugin
293 * This is a linked list.
295 struct TransportPlugin *next;
298 * API of the transport as returned by the plugin's
299 * initialization function.
301 struct GNUNET_TRANSPORT_PluginFunctions *api;
304 * Short name for the plugin (i.e. "tcp").
309 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
314 * List of our known addresses for this transport.
316 struct OwnAddressList *addresses;
319 * Environment this transport service is using
322 struct GNUNET_TRANSPORT_PluginEnvironment env;
325 * ID of task that is used to clean up expired addresses.
327 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
330 * Set to GNUNET_YES if we need to scrap the existing list of
331 * "addresses" and start fresh when we receive the next address
332 * update from a transport. Set to GNUNET_NO if we should just add
333 * the new address to the list and wait for the commit call.
338 * Hashmap of blacklisted peers for this particular transport.
340 struct GNUNET_CONTAINER_MultiHashMap *blacklist;
343 struct NeighbourList;
346 * For each neighbour we keep a list of messages
347 * that we still want to transmit to the neighbour.
353 * This is a doubly linked list.
355 struct MessageQueue *next;
358 * This is a doubly linked list.
360 struct MessageQueue *prev;
363 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
364 * stuck together in memory. Allocated at the end of this struct.
366 const char *message_buf;
369 * Size of the message buf
371 size_t message_buf_size;
374 * Client responsible for queueing the message;
375 * used to check that a client has no two messages
376 * pending for the same target. Can be NULL.
378 struct TransportClient *client;
381 * Using which specific address should we send this message?
383 struct ForeignAddressList *specific_address;
386 * Peer ID of the Neighbour this entry belongs to.
388 struct GNUNET_PeerIdentity neighbour_id;
391 * Plugin that we used for the transmission.
392 * NULL until we scheduled a transmission.
394 struct TransportPlugin *plugin;
397 * At what time should we fail?
399 struct GNUNET_TIME_Absolute timeout;
402 * Internal message of the transport system that should not be
403 * included in the usual SEND-SEND_OK transmission confirmation
404 * traffic management scheme. Typically, "internal_msg" will
405 * be set whenever "client" is NULL (but it is not strictly
411 * How important is the message?
413 unsigned int priority;
419 * For a given Neighbour, which plugins are available
420 * to talk to this peer and what are their costs?
425 * This is a linked list.
427 struct ReadyList *next;
430 * Which of our transport plugins does this entry
433 struct TransportPlugin *plugin;
436 * Transport addresses, latency, and readiness for
437 * this particular plugin.
439 struct ForeignAddressList *addresses;
442 * To which neighbour does this ready list belong to?
444 struct NeighbourList *neighbour;
450 * Entry in linked list of all of our current neighbours.
456 * This is a linked list.
458 struct NeighbourList *next;
461 * Which of our transports is connected to this peer
462 * and what is their status?
464 struct ReadyList *plugins;
467 * Head of list of messages we would like to send to this peer;
468 * must contain at most one message per client.
470 struct MessageQueue *messages_head;
473 * Tail of list of messages we would like to send to this peer; must
474 * contain at most one message per client.
476 struct MessageQueue *messages_tail;
479 * Buffer for at most one payload message used when we receive
480 * payload data before our PING-PONG has succeeded. We then
481 * store such messages in this intermediary buffer until the
482 * connection is fully up.
484 struct GNUNET_MessageHeader *pre_connect_message_buffer;
487 * Context for peerinfo iteration.
488 * NULL after we are done processing peerinfo's information.
490 struct GNUNET_PEERINFO_IteratorContext *piter;
493 * Public key for this peer. Valid only if the respective flag is set below.
495 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
498 * Identity of this neighbour.
500 struct GNUNET_PeerIdentity id;
503 * ID of task scheduled to run when this peer is about to
504 * time out (will free resources associated with the peer).
506 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
509 * ID of task scheduled to run when we should retry transmitting
510 * the head of the message queue. Actually triggered when the
511 * transmission is timing out (we trigger instantly when we have
512 * a chance of success).
514 GNUNET_SCHEDULER_TaskIdentifier retry_task;
517 * How long until we should consider this peer dead
518 * (if we don't receive another message in the
521 struct GNUNET_TIME_Absolute peer_timeout;
524 * Tracker for inbound bandwidth.
526 struct GNUNET_BANDWIDTH_Tracker in_tracker;
529 * The latency we have seen for this particular address for
530 * this particular peer. This latency may have been calculated
531 * over multiple transports. This value reflects how long it took
532 * us to receive a response when SENDING via this particular
533 * transport/neighbour/address combination!
535 * FIXME: we need to periodically send PINGs to update this
536 * latency (at least more often than the current "huge" (11h?)
539 struct GNUNET_TIME_Relative latency;
542 * How often has the other peer (recently) violated the
543 * inbound traffic limit? Incremented by 10 per violation,
544 * decremented by 1 per non-violation (for each
547 unsigned int quota_violation_count;
550 * DV distance to this peer (1 if no DV is used).
555 * Have we seen an PONG from this neighbour in the past (and
556 * not had a disconnect since)?
561 * Do we have a valid public key for this neighbour?
563 int public_key_valid;
568 * Message used to ask a peer to validate receipt (to check an address
569 * from a HELLO). Followed by the address we are trying to validate,
570 * or an empty address if we are just sending a PING to confirm that a
571 * connection which the receiver (of the PING) initiated is still valid.
573 struct TransportPingMessage
577 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
579 struct GNUNET_MessageHeader header;
582 * Challenge code (to ensure fresh reply).
584 uint32_t challenge GNUNET_PACKED;
587 * Who is the intended recipient?
589 struct GNUNET_PeerIdentity target;
595 * Message used to validate a HELLO. The challenge is included in the
596 * confirmation to make matching of replies to requests possible. The
597 * signature signs our public key, an expiration time and our address.<p>
599 * This message is followed by our transport address that the PING tried
600 * to confirm (if we liked it). The address can be empty (zero bytes)
601 * if the PING had not address either (and we received the request via
602 * a connection that we initiated).
604 struct TransportPongMessage
608 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
610 struct GNUNET_MessageHeader header;
613 * Challenge code from PING (showing freshness). Not part of what
614 * is signed so that we can re-use signatures.
616 uint32_t challenge GNUNET_PACKED;
621 struct GNUNET_CRYPTO_RsaSignature signature;
624 * What are we signing and why? Two possible reason codes can be here:
625 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
626 * plausible address for this peer (pid is set to identity of signer); or
627 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING to confirm that this is
628 * an address we used to connect to the peer with the given pid.
630 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
633 * When does this signature expire?
635 struct GNUNET_TIME_AbsoluteNBO expiration;
638 * Either the identity of the peer Who signed this message, or the
639 * identity of the peer that we're connected to using the given
640 * address (depending on purpose.type).
642 struct GNUNET_PeerIdentity pid;
645 * Size of address appended to this message (part of what is
646 * being signed, hence not redundant).
654 * Linked list of messages to be transmitted to the client. Each
655 * entry is followed by the actual message.
657 struct ClientMessageQueueEntry
660 * This is a doubly-linked list.
662 struct ClientMessageQueueEntry *next;
665 * This is a doubly-linked list.
667 struct ClientMessageQueueEntry *prev;
672 * Client connected to the transport service.
674 struct TransportClient
678 * This is a linked list.
680 struct TransportClient *next;
683 * Handle to the client.
685 struct GNUNET_SERVER_Client *client;
688 * Linked list of messages yet to be transmitted to
691 struct ClientMessageQueueEntry *message_queue_head;
694 * Tail of linked list of messages yet to be transmitted to the
697 struct ClientMessageQueueEntry *message_queue_tail;
700 * Current transmit request handle.
702 struct GNUNET_CONNECTION_TransmitHandle *th;
705 * Is a call to "transmit_send_continuation" pending? If so, we
706 * must not free this struct (even if the corresponding client
707 * disconnects) and instead only remove it from the linked list and
708 * set the "client" field to NULL.
713 * Length of the list of messages pending for this client.
715 unsigned int message_count;
721 * Context of currently active requests to peerinfo
722 * for validation of HELLOs.
724 struct CheckHelloValidatedContext;
728 * Entry in map of all HELLOs awaiting validation.
730 struct ValidationEntry
734 * NULL if this entry is not part of a larger HELLO validation.
736 struct CheckHelloValidatedContext *chvc;
739 * The address, actually a pointer to the end
740 * of this struct. Do not free!
745 * Name of the transport.
747 char *transport_name;
750 * The public key of the peer.
752 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
755 * ID of task that will clean up this entry if we don't succeed
756 * with the validation first.
758 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
761 * At what time did we send this validation?
763 struct GNUNET_TIME_Absolute send_time;
766 * Session being validated (or NULL for none).
768 struct Session *session;
771 * Challenge number we used.
784 * Context of currently active requests to peerinfo
785 * for validation of HELLOs.
787 struct CheckHelloValidatedContext
791 * This is a doubly-linked list.
793 struct CheckHelloValidatedContext *next;
796 * This is a doubly-linked list.
798 struct CheckHelloValidatedContext *prev;
801 * Hello that we are validating.
803 const struct GNUNET_HELLO_Message *hello;
806 * Context for peerinfo iteration.
807 * NULL after we are done processing peerinfo's information.
809 struct GNUNET_PEERINFO_IteratorContext *piter;
812 * Was a HELLO known for this peer to peerinfo?
817 * Number of validation entries currently referring to this
820 unsigned int ve_count;
828 static struct GNUNET_HELLO_Message *our_hello;
833 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
838 static struct GNUNET_PeerIdentity my_identity;
843 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
848 const struct GNUNET_CONFIGURATION_Handle *cfg;
851 * Linked list of all clients to this service.
853 static struct TransportClient *clients;
856 * All loaded plugins.
858 static struct TransportPlugin *plugins;
861 * Handle to peerinfo service.
863 static struct GNUNET_PEERINFO_Handle *peerinfo;
866 * All known neighbours and their HELLOs.
868 static struct NeighbourList *neighbours;
871 * Number of neighbours we'd like to have.
873 static uint32_t max_connect_per_transport;
876 * Head of linked list.
878 static struct CheckHelloValidatedContext *chvc_head;
881 * Tail of linked list.
883 static struct CheckHelloValidatedContext *chvc_tail;
886 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
887 * of the given peer that we are currently validating).
889 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
892 * Handle for reporting statistics.
894 static struct GNUNET_STATISTICS_Handle *stats;
897 * The peer specified by the given neighbour has timed-out or a plugin
898 * has disconnected. We may either need to do nothing (other plugins
899 * still up), or trigger a full disconnect and clean up. This
900 * function updates our state and do the necessary notifications.
901 * Also notifies our clients that the neighbour is now officially
904 * @param n the neighbour list entry for the peer
905 * @param check should we just check if all plugins
906 * disconnected or must we ask all plugins to
909 static void disconnect_neighbour (struct NeighbourList *n, int check);
912 * Check the ready list for the given neighbour and if a plugin is
913 * ready for transmission (and if we have a message), do so!
915 * @param neighbour target peer for which to transmit
917 static void try_transmission_to_peer (struct NeighbourList *neighbour);
921 * Find an entry in the neighbour list for a particular peer.
923 * @return NULL if not found.
925 static struct NeighbourList *
926 find_neighbour (const struct GNUNET_PeerIdentity *key)
928 struct NeighbourList *head = neighbours;
930 while ((head != NULL) &&
931 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
938 * Find an entry in the transport list for a particular transport.
940 * @return NULL if not found.
942 static struct TransportPlugin *
943 find_transport (const char *short_name)
945 struct TransportPlugin *head = plugins;
946 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
952 * Is a particular peer blacklisted for a particular transport?
954 * @param peer the peer to check for
955 * @param plugin the plugin used to connect to the peer
957 * @return GNUNET_YES if the peer is blacklisted, GNUNET_NO if not
960 is_blacklisted (const struct GNUNET_PeerIdentity *peer, struct TransportPlugin *plugin)
963 if (plugin->blacklist != NULL)
965 if (GNUNET_CONTAINER_multihashmap_contains(plugin->blacklist, &peer->hashPubKey) == GNUNET_YES)
968 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
969 _("Peer `%s:%s' is blacklisted!\n"),
970 plugin->short_name, GNUNET_i2s (peer));
981 add_peer_to_blacklist (struct GNUNET_PeerIdentity *peer, char *transport_name)
983 struct TransportPlugin *plugin;
985 plugin = find_transport(transport_name);
986 if (plugin == NULL) /* Nothing to do */
988 if (plugin->blacklist == NULL)
989 plugin->blacklist = GNUNET_CONTAINER_multihashmap_create(TRANSPORT_BLACKLIST_HT_SIZE);
990 GNUNET_assert(plugin->blacklist != NULL);
991 GNUNET_CONTAINER_multihashmap_put(plugin->blacklist, &peer->hashPubKey,
993 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
998 * Read the blacklist file, containing transport:peer entries.
999 * Provided the transport is loaded, set up hashmap with these
1000 * entries to blacklist peers by transport.
1004 read_blacklist_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
1011 struct GNUNET_PeerIdentity pid;
1013 struct GNUNET_CRYPTO_HashAsciiEncoded enc;
1014 unsigned int entries_found;
1015 char *transport_name;
1018 GNUNET_CONFIGURATION_get_value_filename (cfg,
1024 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1025 _("Option `%s' in section `%s' not specified!\n"),
1031 if (GNUNET_OK != GNUNET_DISK_file_test (fn))
1032 GNUNET_DISK_fn_write (fn, NULL, 0, GNUNET_DISK_PERM_USER_READ
1033 | GNUNET_DISK_PERM_USER_WRITE);
1034 if (0 != STAT (fn, &frstat))
1036 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1037 _("Could not read blacklist file `%s'\n"), fn);
1041 if (frstat.st_size == 0)
1044 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1045 _("Blacklist file `%s' is empty.\n"),
1051 /* FIXME: use mmap */
1052 data = GNUNET_malloc_large (frstat.st_size);
1053 GNUNET_assert(data != NULL);
1054 if (frstat.st_size !=
1055 GNUNET_DISK_fn_read (fn, data, frstat.st_size))
1057 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1058 _("Failed to read blacklist from `%s'\n"), fn);
1065 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1067 while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
1068 (pos <= frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
1071 while ((colon_pos < frstat.st_size) && (data[colon_pos] != ':') && !isspace ( (unsigned char) data[colon_pos]))
1074 if (colon_pos >= frstat.st_size)
1076 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1077 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1078 (unsigned long long) colon_pos);
1084 if (isspace( (unsigned char) data[colon_pos]))
1086 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1087 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1088 (unsigned long long) colon_pos);
1090 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1094 tsize = colon_pos - pos;
1095 if ((pos >= frstat.st_size) || (pos + tsize >= frstat.st_size) || (tsize == 0))
1097 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1098 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1099 (unsigned long long) colon_pos);
1108 transport_name = GNUNET_malloc(tsize + 1);
1109 memcpy(transport_name, &data[pos], tsize);
1110 pos = colon_pos + 1;
1112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1113 _("Read transport name %s in blacklist file.\n"),
1116 memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
1117 if (!isspace ( (unsigned char) enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
1119 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1120 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1121 (unsigned long long) pos);
1123 while ((pos < frstat.st_size) && (!isspace ( (unsigned char) data[pos])))
1125 GNUNET_free_non_null(transport_name);
1128 enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
1129 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
1131 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1132 _("Syntax error in blacklist file at offset %llu, skipping bytes `%s'.\n"),
1133 (unsigned long long) pos,
1138 if (0 != memcmp (&pid,
1140 sizeof (struct GNUNET_PeerIdentity)))
1143 add_peer_to_blacklist (&pid,
1148 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1149 _("Found myself `%s' in blacklist (useless, ignored)\n"),
1153 pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
1154 GNUNET_free_non_null(transport_name);
1155 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1164 * Function called to notify a client about the socket being ready to
1165 * queue more data. "buf" will be NULL and "size" zero if the socket
1166 * was closed for writing in the meantime.
1168 * @param cls closure
1169 * @param size number of bytes available in buf
1170 * @param buf where the callee should write the message
1171 * @return number of bytes written to buf
1174 transmit_to_client_callback (void *cls, size_t size, void *buf)
1176 struct TransportClient *client = cls;
1177 struct ClientMessageQueueEntry *q;
1180 const struct GNUNET_MessageHeader *msg;
1186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1187 "Transmission to client failed, closing connection.\n");
1188 /* fatal error with client, free message queue! */
1189 while (NULL != (q = client->message_queue_head))
1191 GNUNET_STATISTICS_update (stats,
1192 gettext_noop ("# bytes discarded (could not transmit to client)"),
1193 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
1195 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1196 client->message_queue_tail,
1200 client->message_count = 0;
1205 while (NULL != (q = client->message_queue_head))
1207 msg = (const struct GNUNET_MessageHeader *) &q[1];
1208 msize = ntohs (msg->size);
1209 if (msize + tsize > size)
1212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1213 "Transmitting message of type %u to client.\n",
1216 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1217 client->message_queue_tail,
1219 memcpy (&cbuf[tsize], msg, msize);
1222 client->message_count--;
1226 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1227 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1229 GNUNET_TIME_UNIT_FOREVER_REL,
1230 &transmit_to_client_callback,
1232 GNUNET_assert (client->th != NULL);
1239 * Convert an address to a string.
1241 * @param plugin name of the plugin responsible for the address
1242 * @param addr binary address
1243 * @param addr_len number of bytes in addr
1244 * @return NULL on error, otherwise address string
1247 a2s (const char *plugin,
1251 struct TransportPlugin *p;
1255 p = find_transport (plugin);
1258 return p->api->address_to_string (p->api->cls,
1265 * Mark the given FAL entry as 'connected' (and hence preferred for
1266 * sending); also mark all others for the same peer as 'not connected'
1267 * (since only one can be preferred).
1269 * @param fal address to set to 'connected'
1272 mark_address_connected (struct ForeignAddressList *fal)
1274 struct ForeignAddressList *pos;
1277 GNUNET_assert (GNUNET_YES == fal->validated);
1278 if (fal->connected == GNUNET_YES)
1279 return; /* nothing to do */
1281 pos = fal->ready_list->addresses;
1284 if (GNUNET_YES == pos->connected)
1287 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1288 "Marking address `%s' as no longer connected (due to connect on other address)\n",
1289 a2s (pos->ready_list->plugin->short_name,
1293 GNUNET_break (cnt == GNUNET_YES);
1295 pos->connected = GNUNET_NO;
1296 GNUNET_STATISTICS_update (stats,
1297 gettext_noop ("# connected addresses"),
1303 fal->connected = GNUNET_YES;
1304 if (GNUNET_YES == cnt)
1306 GNUNET_STATISTICS_update (stats,
1307 gettext_noop ("# connected addresses"),
1315 * Send the specified message to the specified client. Since multiple
1316 * messages may be pending for the same client at a time, this code
1317 * makes sure that no message is lost.
1319 * @param client client to transmit the message to
1320 * @param msg the message to send
1321 * @param may_drop can this message be dropped if the
1322 * message queue for this client is getting far too large?
1325 transmit_to_client (struct TransportClient *client,
1326 const struct GNUNET_MessageHeader *msg, int may_drop)
1328 struct ClientMessageQueueEntry *q;
1331 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
1333 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1335 ("Dropping message of type %u and size %u, have %u messages pending (%u is the soft limit)\n"),
1338 client->message_count,
1340 GNUNET_STATISTICS_update (stats,
1341 gettext_noop ("# messages dropped due to slow client"),
1346 msize = ntohs (msg->size);
1347 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1348 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1349 memcpy (&q[1], msg, msize);
1350 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1351 client->message_queue_tail,
1352 client->message_queue_tail,
1354 client->message_count++;
1355 if (client->th == NULL)
1357 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1359 GNUNET_TIME_UNIT_FOREVER_REL,
1360 &transmit_to_client_callback,
1362 GNUNET_assert (client->th != NULL);
1368 * Transmit a 'SEND_OK' notification to the given client for the
1371 * @param client who to notify
1372 * @param n neighbour to notify about
1373 * @param result status code for the transmission request
1376 transmit_send_ok (struct TransportClient *client,
1377 struct NeighbourList *n,
1380 struct SendOkMessage send_ok_msg;
1382 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1383 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1384 send_ok_msg.success = htonl (result);
1385 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1386 send_ok_msg.peer = n->id;
1387 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1392 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1393 * upon "completion" of a send request. This tells the API
1394 * that it is now legal to send another message to the given
1397 * @param cls closure, identifies the entry on the
1398 * message queue that was transmitted and the
1399 * client responsible for queueing the message
1400 * @param target the peer receiving the message
1401 * @param result GNUNET_OK on success, if the transmission
1402 * failed, we should not tell the client to transmit
1406 transmit_send_continuation (void *cls,
1407 const struct GNUNET_PeerIdentity *target,
1410 struct MessageQueue *mq = cls;
1411 struct NeighbourList *n;
1413 GNUNET_STATISTICS_update (stats,
1414 gettext_noop ("# bytes pending with plugins"),
1415 - (int64_t) mq->message_buf_size,
1417 if (result == GNUNET_OK)
1419 GNUNET_STATISTICS_update (stats,
1420 gettext_noop ("# bytes successfully transmitted by plugins"),
1421 mq->message_buf_size,
1426 GNUNET_STATISTICS_update (stats,
1427 gettext_noop ("# bytes with transmission failure by plugins"),
1428 mq->message_buf_size,
1431 n = find_neighbour(&mq->neighbour_id);
1432 GNUNET_assert (n != NULL);
1433 if (mq->specific_address != NULL)
1435 if (result == GNUNET_OK)
1437 mq->specific_address->timeout =
1438 GNUNET_TIME_relative_to_absolute
1439 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1440 if (mq->specific_address->validated == GNUNET_YES)
1441 mark_address_connected (mq->specific_address);
1445 if (mq->specific_address->connected != GNUNET_NO)
1448 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1449 "Marking address `%s' as no longer connected (due to transmission problem)\n",
1450 a2s (mq->specific_address->ready_list->plugin->short_name,
1451 mq->specific_address->addr,
1452 mq->specific_address->addrlen));
1454 GNUNET_STATISTICS_update (stats,
1455 gettext_noop ("# connected addresses"),
1458 mq->specific_address->connected = GNUNET_NO;
1461 if (! mq->internal_msg)
1462 mq->specific_address->in_transmit = GNUNET_NO;
1464 if (mq->client != NULL)
1465 transmit_send_ok (mq->client, n, result);
1467 try_transmission_to_peer (n);
1472 * Find an address in any of the available transports for
1473 * the given neighbour that would be good for message
1474 * transmission. This is essentially the transport selection
1477 * @param neighbour for whom to select an address
1478 * @return selected address, NULL if we have none
1480 struct ForeignAddressList *
1481 find_ready_address(struct NeighbourList *neighbour)
1483 struct ReadyList *head = neighbour->plugins;
1484 struct ForeignAddressList *addresses;
1485 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1486 struct ForeignAddressList *best_address;
1488 best_address = NULL;
1489 while (head != NULL)
1491 addresses = head->addresses;
1492 while (addresses != NULL)
1494 if ( (addresses->timeout.abs_value < now.abs_value) &&
1495 (addresses->connected == GNUNET_YES) )
1498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1499 "Marking long-time inactive connection to `%4s' as down.\n",
1500 GNUNET_i2s (&neighbour->id));
1502 GNUNET_STATISTICS_update (stats,
1503 gettext_noop ("# connected addresses"),
1506 addresses->connected = GNUNET_NO;
1508 addresses = addresses->next;
1511 addresses = head->addresses;
1512 while (addresses != NULL)
1514 #if DEBUG_TRANSPORT > 1
1515 if (addresses->addr != NULL)
1516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1517 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1518 a2s (head->plugin->short_name,
1520 addresses->addrlen),
1521 GNUNET_i2s (&neighbour->id),
1522 addresses->connected,
1523 addresses->in_transmit,
1524 addresses->validated,
1525 addresses->connect_attempts,
1526 (unsigned long long) addresses->timeout.abs_value,
1527 (unsigned int) addresses->distance);
1529 if ( ( (best_address == NULL) ||
1530 (addresses->connected == GNUNET_YES) ||
1531 (best_address->connected == GNUNET_NO) ) &&
1532 (addresses->in_transmit == GNUNET_NO) &&
1533 ( (best_address == NULL) ||
1534 (addresses->latency.rel_value < best_address->latency.rel_value)) )
1535 best_address = addresses;
1536 /* FIXME: also give lower-latency addresses that are not
1537 connected a chance some times... */
1538 addresses = addresses->next;
1542 if (best_address != NULL)
1545 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1546 "Best address found (`%s') has latency of %llu ms.\n",
1547 (best_address->addrlen > 0)
1548 ? a2s (best_address->ready_list->plugin->short_name,
1550 best_address->addrlen)
1552 best_address->latency.rel_value);
1557 GNUNET_STATISTICS_update (stats,
1558 gettext_noop ("# transmission attempts failed (no address)"),
1562 return best_address;
1568 * We should re-try transmitting to the given peer,
1569 * hopefully we've learned something in the meantime.
1572 retry_transmission_task (void *cls,
1573 const struct GNUNET_SCHEDULER_TaskContext *tc)
1575 struct NeighbourList *n = cls;
1577 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1578 try_transmission_to_peer (n);
1583 * Check the ready list for the given neighbour and if a plugin is
1584 * ready for transmission (and if we have a message), do so!
1586 * @param neighbour target peer for which to transmit
1589 try_transmission_to_peer (struct NeighbourList *neighbour)
1591 struct ReadyList *rl;
1592 struct MessageQueue *mq;
1593 struct GNUNET_TIME_Relative timeout;
1597 if (neighbour->messages_head == NULL)
1600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1601 "Transmission queue for `%4s' is empty\n",
1602 GNUNET_i2s (&neighbour->id));
1604 return; /* nothing to do */
1607 mq = neighbour->messages_head;
1608 force_address = GNUNET_YES;
1609 if (mq->specific_address == NULL)
1611 mq->specific_address = find_ready_address(neighbour);
1612 GNUNET_STATISTICS_update (stats,
1613 gettext_noop ("# transport selected peer address freely"),
1616 force_address = GNUNET_NO;
1618 if (mq->specific_address == NULL)
1620 GNUNET_STATISTICS_update (stats,
1621 gettext_noop ("# transport failed to selected peer address"),
1624 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1625 if (timeout.rel_value == 0)
1628 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1629 "No destination address available to transmit message of size %u to peer `%4s'\n",
1630 mq->message_buf_size,
1631 GNUNET_i2s (&mq->neighbour_id));
1633 GNUNET_STATISTICS_update (stats,
1634 gettext_noop ("# bytes in message queue for other peers"),
1635 - (int64_t) mq->message_buf_size,
1637 GNUNET_STATISTICS_update (stats,
1638 gettext_noop ("# bytes discarded (no destination address available)"),
1639 mq->message_buf_size,
1641 if (mq->client != NULL)
1642 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1643 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1644 neighbour->messages_tail,
1647 return; /* nobody ready */
1649 GNUNET_STATISTICS_update (stats,
1650 gettext_noop ("# message delivery deferred (no address)"),
1653 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1654 GNUNET_SCHEDULER_cancel (neighbour->retry_task);
1655 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (timeout,
1656 &retry_transmission_task,
1659 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1660 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1661 mq->message_buf_size,
1662 GNUNET_i2s (&mq->neighbour_id),
1665 /* FIXME: might want to trigger peerinfo lookup here
1666 (unless that's already pending...) */
1669 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1670 neighbour->messages_tail,
1672 if (mq->specific_address->connected == GNUNET_NO)
1673 mq->specific_address->connect_attempts++;
1674 rl = mq->specific_address->ready_list;
1675 mq->plugin = rl->plugin;
1676 if (!mq->internal_msg)
1677 mq->specific_address->in_transmit = GNUNET_YES;
1679 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1680 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1681 mq->message_buf_size,
1682 GNUNET_i2s (&neighbour->id),
1683 (mq->specific_address->addr != NULL)
1684 ? a2s (mq->plugin->short_name,
1685 mq->specific_address->addr,
1686 mq->specific_address->addrlen)
1688 rl->plugin->short_name);
1690 GNUNET_STATISTICS_update (stats,
1691 gettext_noop ("# bytes in message queue for other peers"),
1692 - (int64_t) mq->message_buf_size,
1694 GNUNET_STATISTICS_update (stats,
1695 gettext_noop ("# bytes pending with plugins"),
1696 mq->message_buf_size,
1698 ret = rl->plugin->api->send (rl->plugin->api->cls,
1701 mq->message_buf_size,
1703 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1704 mq->specific_address->session,
1705 mq->specific_address->addr,
1706 mq->specific_address->addrlen,
1708 &transmit_send_continuation, mq);
1711 /* failure, but 'send' would not call continuation in this case,
1712 so we need to do it here! */
1713 transmit_send_continuation (mq,
1721 * Send the specified message to the specified peer.
1723 * @param client source of the transmission request (can be NULL)
1724 * @param peer_address ForeignAddressList where we should send this message
1725 * @param priority how important is the message
1726 * @param timeout how long do we have to transmit?
1727 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1728 * @param message_buf_size total size of all messages in message_buf
1729 * @param is_internal is this an internal message; these are pre-pended and
1730 * also do not count for plugins being "ready" to transmit
1731 * @param neighbour handle to the neighbour for transmission
1734 transmit_to_peer (struct TransportClient *client,
1735 struct ForeignAddressList *peer_address,
1736 unsigned int priority,
1737 struct GNUNET_TIME_Relative timeout,
1738 const char *message_buf,
1739 size_t message_buf_size,
1740 int is_internal, struct NeighbourList *neighbour)
1742 struct MessageQueue *mq;
1747 /* check for duplicate submission */
1748 mq = neighbour->messages_head;
1751 if (mq->client == client)
1753 /* client transmitted to same peer twice
1754 before getting SEND_OK! */
1762 GNUNET_STATISTICS_update (stats,
1763 gettext_noop ("# bytes in message queue for other peers"),
1766 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1767 mq->specific_address = peer_address;
1768 mq->client = client;
1769 /* FIXME: this memcpy can be up to 7% of our total runtime! */
1770 memcpy (&mq[1], message_buf, message_buf_size);
1771 mq->message_buf = (const char*) &mq[1];
1772 mq->message_buf_size = message_buf_size;
1773 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1774 mq->internal_msg = is_internal;
1775 mq->priority = priority;
1776 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1778 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1779 neighbour->messages_tail,
1782 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1783 neighbour->messages_tail,
1784 neighbour->messages_tail,
1786 try_transmission_to_peer (neighbour);
1793 struct GeneratorContext
1795 struct TransportPlugin *plug_pos;
1796 struct OwnAddressList *addr_pos;
1797 struct GNUNET_TIME_Absolute expiration;
1805 address_generator (void *cls, size_t max, void *buf)
1807 struct GeneratorContext *gc = cls;
1810 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1812 gc->plug_pos = gc->plug_pos->next;
1813 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1815 if (NULL == gc->plug_pos)
1820 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1823 gc->addr_pos->addrlen, buf, max);
1824 gc->addr_pos = gc->addr_pos->next;
1830 * Construct our HELLO message from all of the addresses of
1831 * all of the transports.
1836 struct GNUNET_HELLO_Message *hello;
1837 struct TransportClient *cpos;
1838 struct NeighbourList *npos;
1839 struct GeneratorContext gc;
1841 gc.plug_pos = plugins;
1842 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1843 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1844 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1847 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1849 GNUNET_STATISTICS_update (stats,
1850 gettext_noop ("# refreshed my HELLO"),
1854 while (cpos != NULL)
1856 transmit_to_client (cpos,
1857 (const struct GNUNET_MessageHeader *) hello,
1862 GNUNET_free_non_null (our_hello);
1864 GNUNET_PEERINFO_add_peer (peerinfo, our_hello);
1866 while (npos != NULL)
1869 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1870 "Transmitting updated `%s' to neighbour `%4s'\n",
1871 "HELLO", GNUNET_i2s (&npos->id));
1873 GNUNET_STATISTICS_update (stats,
1874 gettext_noop ("# transmitted my HELLO to other peers"),
1877 transmit_to_peer (NULL, NULL, 0,
1878 HELLO_ADDRESS_EXPIRATION,
1879 (const char *) our_hello,
1880 GNUNET_HELLO_size(our_hello),
1888 * Task used to clean up expired addresses for a plugin.
1890 * @param cls closure
1894 expire_address_task (void *cls,
1895 const struct GNUNET_SCHEDULER_TaskContext *tc);
1899 * Update the list of addresses for this plugin,
1900 * expiring those that are past their expiration date.
1902 * @param plugin addresses of which plugin should be recomputed?
1903 * @param fresh set to GNUNET_YES if a new address was added
1904 * and we need to regenerate the HELLO even if nobody
1908 update_addresses (struct TransportPlugin *plugin,
1911 static struct GNUNET_TIME_Absolute last_update;
1912 struct GNUNET_TIME_Relative min_remaining;
1913 struct GNUNET_TIME_Relative remaining;
1914 struct GNUNET_TIME_Absolute now;
1915 struct OwnAddressList *pos;
1916 struct OwnAddressList *prev;
1917 struct OwnAddressList *next;
1920 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1921 GNUNET_SCHEDULER_cancel (plugin->address_update_task);
1922 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1923 now = GNUNET_TIME_absolute_get ();
1924 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1925 expired = (GNUNET_TIME_absolute_get_duration (last_update).rel_value > (HELLO_ADDRESS_EXPIRATION.rel_value / 4));
1927 pos = plugin->addresses;
1931 if (pos->expires.abs_value < now.abs_value)
1933 expired = GNUNET_YES;
1935 plugin->addresses = pos->next;
1937 prev->next = pos->next;
1942 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1943 if (remaining.rel_value < min_remaining.rel_value)
1944 min_remaining = remaining;
1950 if (expired || fresh)
1955 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1956 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1958 plugin->address_update_task
1959 = GNUNET_SCHEDULER_add_delayed (min_remaining,
1960 &expire_address_task, plugin);
1965 * Task used to clean up expired addresses for a plugin.
1967 * @param cls closure
1971 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1973 struct TransportPlugin *plugin = cls;
1975 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1976 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1977 update_addresses (plugin, GNUNET_NO);
1982 * Iterator over hash map entries that NULLs the session of validation
1983 * entries that match the given session.
1985 * @param cls closure (the 'struct Session*' to match against)
1986 * @param key current key code (peer ID, not used)
1987 * @param value value in the hash map ('struct ValidationEntry*')
1988 * @return GNUNET_YES (we should continue to iterate)
1991 remove_session_validations (void *cls,
1992 const GNUNET_HashCode * key,
1995 struct Session *session = cls;
1996 struct ValidationEntry *ve = value;
1998 if (session == ve->session)
2005 * We've been disconnected from the other peer (for some
2006 * connection-oriented transport). Either quickly
2007 * re-establish the connection or signal the disconnect
2010 * Only signal CORE level disconnect if ALL addresses
2011 * for the peer are exhausted.
2013 * @param p overall plugin context
2014 * @param nl neighbour that was disconnected
2017 try_fast_reconnect (struct TransportPlugin *p,
2018 struct NeighbourList *nl)
2020 /* FIXME-MW: fast reconnect / transport switching not implemented... */
2021 /* Note: the idea here is to hide problems with transports (or
2022 switching between plugins) from the core to eliminate the need to
2023 re-negotiate session keys and the like; OTOH, we should tell core
2024 quickly (much faster than timeout) `if a connection was lost and
2025 could not be re-established (i.e. other peer went down or is
2026 unable / refuses to communicate);
2028 So we should consider:
2029 1) ideally: our own willingness / need to connect
2030 2) prior failures to connect to this peer (by plugin)
2031 3) ideally: reasons why other peer terminated (as far as knowable)
2033 Most importantly, it must be POSSIBLE for another peer to terminate
2034 a connection for a while (without us instantly re-establishing it).
2035 Similarly, if another peer is gone we should quickly notify CORE.
2036 OTOH, if there was a minor glitch (i.e. crash of gnunet-service-transport
2037 on the other end), we should reconnect in such a way that BOTH CORE
2038 services never even notice.
2039 Furthermore, the same mechanism (or small variation) could be used
2040 to switch to a better-performing plugin (ATS).
2042 Finally, this needs to be tested throughly... */
2045 * GNUNET_NO in the call below makes transport disconnect the peer,
2046 * even if only a single address (out of say, six) went away. This
2047 * function must be careful to ONLY disconnect if the peer is gone,
2048 * not just a specifi address.
2050 * More specifically, half the places it was used had it WRONG.
2053 /* No reconnect, signal disconnect instead! */
2054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2055 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&nl->id),
2056 "try_fast_reconnect");
2057 disconnect_neighbour (nl, GNUNET_YES);
2062 * Function that will be called whenever the plugin internally
2063 * cleans up a session pointer and hence the service needs to
2064 * discard all of those sessions as well. Plugins that do not
2065 * use sessions can simply omit calling this function and always
2066 * use NULL wherever a session pointer is needed.
2068 * @param cls closure
2069 * @param peer which peer was the session for
2070 * @param session which session is being destoyed
2073 plugin_env_session_end (void *cls,
2074 const struct GNUNET_PeerIdentity *peer,
2075 struct Session *session)
2077 struct TransportPlugin *p = cls;
2078 struct NeighbourList *nl;
2079 struct ReadyList *rl;
2080 struct ForeignAddressList *pos;
2081 struct ForeignAddressList *prev;
2083 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2084 &remove_session_validations,
2086 nl = find_neighbour (peer);
2088 return; /* was never marked as connected */
2092 if (rl->plugin == p)
2097 return; /* was never marked as connected */
2099 pos = rl->addresses;
2100 while ( (pos != NULL) &&
2101 (pos->session != session) )
2107 return; /* was never marked as connected */
2108 pos->session = NULL;
2109 if (pos->addrlen != 0)
2111 if (nl->received_pong != GNUNET_NO)
2112 try_fast_reconnect (p, nl);
2115 /* was inbound connection, free 'pos' */
2117 rl->addresses = pos->next;
2119 prev->next = pos->next;
2120 if (GNUNET_SCHEDULER_NO_TASK != pos->revalidate_task)
2122 GNUNET_SCHEDULER_cancel (pos->revalidate_task);
2123 pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2126 if (nl->received_pong == GNUNET_NO)
2127 return; /* nothing to do, never connected... */
2128 /* check if we have any validated addresses left */
2129 pos = rl->addresses;
2134 try_fast_reconnect (p, nl);
2139 /* no valid addresses left, signal disconnect! */
2141 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2142 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&nl->id),
2143 "plugin_env_session_end");
2144 /* FIXME: This doesn't mean there are no addresses left for this PEER,
2145 * it means there aren't any left for this PLUGIN/PEER combination! So
2146 * calling disconnect_neighbor here with GNUNET_NO forces disconnect
2147 * when it isn't necessary. Using GNUNET_YES at least checks to see
2148 * if there are any addresses that work first, so as not to overdo it.
2151 disconnect_neighbour (nl, GNUNET_YES);
2156 * Function that must be called by each plugin to notify the
2157 * transport service about the addresses under which the transport
2158 * provided by the plugin can be reached.
2160 * @param cls closure
2161 * @param name name of the transport that generated the address
2162 * @param addr one of the addresses of the host, NULL for the last address
2163 * the specific address format depends on the transport
2164 * @param addrlen length of the address
2165 * @param expires when should this address automatically expire?
2168 plugin_env_notify_address (void *cls,
2172 struct GNUNET_TIME_Relative expires)
2174 struct TransportPlugin *p = cls;
2175 struct OwnAddressList *al;
2176 struct GNUNET_TIME_Absolute abex;
2178 GNUNET_assert (addr != NULL);
2179 abex = GNUNET_TIME_relative_to_absolute (expires);
2180 GNUNET_assert (p == find_transport (name));
2184 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
2187 update_addresses (p, GNUNET_NO);
2193 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
2194 al->next = p->addresses;
2197 al->addrlen = addrlen;
2198 memcpy (&al[1], addr, addrlen);
2199 update_addresses (p, GNUNET_YES);
2204 * Notify all of our clients about a peer connecting.
2207 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
2208 struct GNUNET_TIME_Relative latency,
2211 struct ConnectInfoMessage cim;
2212 struct TransportClient *cpos;
2215 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2216 "Notifying clients about connection from `%s'\n",
2219 GNUNET_STATISTICS_update (stats,
2220 gettext_noop ("# peers connected"),
2223 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2224 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2225 cim.distance = htonl (distance);
2226 cim.latency = GNUNET_TIME_relative_hton (latency);
2227 cim.ats_count = htonl(0);
2228 cim.ats.type = htonl(0);
2229 cim.ats.value = htonl(0);
2230 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
2232 while (cpos != NULL)
2234 transmit_to_client (cpos, &cim.header, GNUNET_NO);
2241 * Notify all of our clients about a peer disconnecting.
2244 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2246 struct DisconnectInfoMessage dim;
2247 struct TransportClient *cpos;
2250 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2251 "Notifying clients about lost connection to `%s'\n",
2254 GNUNET_STATISTICS_update (stats,
2255 gettext_noop ("# peers connected"),
2258 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2259 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2260 dim.reserved = htonl (0);
2261 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2263 while (cpos != NULL)
2265 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2272 * Find a ForeignAddressList entry for the given neighbour
2273 * that matches the given address and transport.
2275 * @param neighbour which peer we care about
2276 * @param tname name of the transport plugin
2277 * @param session session to look for, NULL for 'any'; otherwise
2278 * can be used for the service to "learn" this session ID
2280 * @param addr binary address
2281 * @param addrlen length of addr
2282 * @return NULL if no such entry exists
2284 static struct ForeignAddressList *
2285 find_peer_address(struct NeighbourList *neighbour,
2287 struct Session *session,
2291 struct ReadyList *head;
2292 struct ForeignAddressList *pos;
2294 head = neighbour->plugins;
2295 while (head != NULL)
2297 if (0 == strcmp (tname, head->plugin->short_name))
2303 pos = head->addresses;
2304 while ( (pos != NULL) &&
2305 ( (pos->addrlen != addrlen) ||
2306 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2308 if ( (session != NULL) &&
2309 (pos->session == session) )
2313 if ( (session != NULL) && (pos != NULL) )
2314 pos->session = session; /* learn it! */
2320 * Get the peer address struct for the given neighbour and
2321 * address. If it doesn't yet exist, create it.
2323 * @param neighbour which peer we care about
2324 * @param tname name of the transport plugin
2325 * @param session session of the plugin, or NULL for none
2326 * @param addr binary address
2327 * @param addrlen length of addr
2328 * @return NULL if we do not have a transport plugin for 'tname'
2330 static struct ForeignAddressList *
2331 add_peer_address (struct NeighbourList *neighbour,
2333 struct Session *session,
2337 struct ReadyList *head;
2338 struct ForeignAddressList *ret;
2340 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2343 head = neighbour->plugins;
2345 while (head != NULL)
2347 if (0 == strcmp (tname, head->plugin->short_name))
2353 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2354 ret->session = session;
2357 ret->addr = (const char*) &ret[1];
2358 memcpy (&ret[1], addr, addrlen);
2364 ret->addrlen = addrlen;
2365 ret->expires = GNUNET_TIME_relative_to_absolute
2366 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2367 ret->latency = GNUNET_TIME_relative_get_forever();
2369 ret->timeout = GNUNET_TIME_relative_to_absolute
2370 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2371 ret->ready_list = head;
2372 ret->next = head->addresses;
2373 head->addresses = ret;
2379 * Closure for 'add_validated_address'.
2381 struct AddValidatedAddressContext
2384 * Entry that has been validated.
2386 const struct ValidationEntry *ve;
2389 * Flag set after we have added the address so
2390 * that we terminate the iteration next time.
2397 * Callback function used to fill a buffer of max bytes with a list of
2398 * addresses in the format used by HELLOs. Should use
2399 * "GNUNET_HELLO_add_address" as a helper function.
2401 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2402 * @param max maximum number of bytes that can be written to buf
2403 * @param buf where to write the address information
2404 * @return number of bytes written, 0 to signal the
2405 * end of the iteration.
2408 add_validated_address (void *cls,
2409 size_t max, void *buf)
2411 struct AddValidatedAddressContext *avac = cls;
2412 const struct ValidationEntry *ve = avac->ve;
2414 if (GNUNET_YES == avac->done)
2416 avac->done = GNUNET_YES;
2417 return GNUNET_HELLO_add_address (ve->transport_name,
2418 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2428 * Closure for 'check_address_exists'.
2430 struct CheckAddressExistsClosure
2433 * Address to check for.
2438 * Name of the transport.
2445 struct Session *session;
2448 * Set to GNUNET_YES if the address exists.
2461 * Iterator over hash map entries. Checks if the given
2462 * validation entry is for the same address as what is given
2465 * @param cls the 'struct CheckAddressExistsClosure*'
2466 * @param key current key code (ignored)
2467 * @param value value in the hash map ('struct ValidationEntry')
2468 * @return GNUNET_YES if we should continue to
2469 * iterate (mismatch), GNUNET_NO if not (entry matched)
2472 check_address_exists (void *cls,
2473 const GNUNET_HashCode * key,
2476 struct CheckAddressExistsClosure *caec = cls;
2477 struct ValidationEntry *ve = value;
2479 if ( (0 == strcmp (caec->tname,
2480 ve->transport_name)) &&
2481 (caec->addrlen == ve->addrlen) &&
2482 (0 == memcmp (caec->addr,
2486 caec->exists = GNUNET_YES;
2489 if ( (ve->session != NULL) &&
2490 (caec->session == ve->session) )
2492 caec->exists = GNUNET_YES;
2501 * Iterator to free entries in the validation_map.
2503 * @param cls closure (unused)
2504 * @param key current key code
2505 * @param value value in the hash map (validation to abort)
2506 * @return GNUNET_YES (always)
2509 abort_validation (void *cls,
2510 const GNUNET_HashCode * key,
2513 struct ValidationEntry *va = value;
2515 if (GNUNET_SCHEDULER_NO_TASK != va->timeout_task)
2516 GNUNET_SCHEDULER_cancel (va->timeout_task);
2517 GNUNET_free (va->transport_name);
2518 if (va->chvc != NULL)
2520 va->chvc->ve_count--;
2521 if (va->chvc->ve_count == 0)
2523 GNUNET_CONTAINER_DLL_remove (chvc_head,
2526 GNUNET_free (va->chvc);
2536 * HELLO validation cleanup task (validation failed).
2538 * @param cls the 'struct ValidationEntry' that failed
2539 * @param tc scheduler context (unused)
2542 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2544 struct ValidationEntry *va = cls;
2545 struct GNUNET_PeerIdentity pid;
2547 va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2548 GNUNET_STATISTICS_update (stats,
2549 gettext_noop ("# address validation timeouts"),
2552 GNUNET_CRYPTO_hash (&va->publicKey,
2554 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2556 GNUNET_break (GNUNET_OK ==
2557 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2560 abort_validation (NULL, NULL, va);
2565 neighbour_timeout_task (void *cls,
2566 const struct GNUNET_SCHEDULER_TaskContext *tc)
2568 struct NeighbourList *n = cls;
2571 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2572 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2574 GNUNET_STATISTICS_update (stats,
2575 gettext_noop ("# disconnects due to timeout"),
2578 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2579 disconnect_neighbour (n, GNUNET_NO);
2584 * Schedule the job that will cause us to send a PING to the
2585 * foreign address to evaluate its validity and latency.
2587 * @param fal address to PING
2590 schedule_next_ping (struct ForeignAddressList *fal);
2594 * Add the given address to the list of foreign addresses
2595 * available for the given peer (check for duplicates).
2597 * @param cls the respective 'struct NeighbourList' to update
2598 * @param tname name of the transport
2599 * @param expiration expiration time
2600 * @param addr the address
2601 * @param addrlen length of the address
2602 * @return GNUNET_OK (always)
2605 add_to_foreign_address_list (void *cls,
2607 struct GNUNET_TIME_Absolute expiration,
2611 struct NeighbourList *n = cls;
2612 struct ForeignAddressList *fal;
2615 GNUNET_STATISTICS_update (stats,
2616 gettext_noop ("# valid peer addresses returned by PEERINFO"),
2620 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2623 #if DEBUG_TRANSPORT_HELLO
2624 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2625 "Adding address `%s' (%s) for peer `%4s' due to PEERINFO data for %llums.\n",
2626 a2s (tname, addr, addrlen),
2628 GNUNET_i2s (&n->id),
2629 expiration.abs_value);
2631 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2634 GNUNET_STATISTICS_update (stats,
2635 gettext_noop ("# previously validated addresses lacking transport"),
2641 fal->expires = GNUNET_TIME_absolute_max (expiration,
2643 schedule_next_ping (fal);
2649 fal->expires = GNUNET_TIME_absolute_max (expiration,
2654 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2655 "Failed to add new address for `%4s'\n",
2656 GNUNET_i2s (&n->id));
2659 if (fal->validated == GNUNET_NO)
2661 fal->validated = GNUNET_YES;
2662 GNUNET_STATISTICS_update (stats,
2663 gettext_noop ("# peer addresses considered valid"),
2667 if (try == GNUNET_YES)
2669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2670 "Have new addresses, will try to trigger transmissions.\n");
2671 try_transmission_to_peer (n);
2678 * Add addresses in validated HELLO "h" to the set of addresses
2679 * we have for this peer.
2681 * @param cls closure ('struct NeighbourList*')
2682 * @param peer id of the peer, NULL for last call
2683 * @param h hello message for the peer (can be NULL)
2686 add_hello_for_peer (void *cls,
2687 const struct GNUNET_PeerIdentity *peer,
2688 const struct GNUNET_HELLO_Message *h)
2690 struct NeighbourList *n = cls;
2694 GNUNET_STATISTICS_update (stats,
2695 gettext_noop ("# outstanding peerinfo iterate requests"),
2702 return; /* no HELLO available */
2704 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2705 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2709 if (GNUNET_YES != n->public_key_valid)
2711 GNUNET_HELLO_get_key (h, &n->publicKey);
2712 n->public_key_valid = GNUNET_YES;
2714 GNUNET_HELLO_iterate_addresses (h,
2716 &add_to_foreign_address_list,
2722 * Create a fresh entry in our neighbour list for the given peer.
2723 * Will try to transmit our current HELLO to the new neighbour.
2724 * Do not call this function directly, use 'setup_peer_check_blacklist.
2726 * @param peer the peer for which we create the entry
2727 * @param do_hello should we schedule transmitting a HELLO
2728 * @return the new neighbour list entry
2730 static struct NeighbourList *
2731 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2734 struct NeighbourList *n;
2735 struct TransportPlugin *tp;
2736 struct ReadyList *rl;
2739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2740 "Setting up state for neighbour `%4s'\n",
2743 GNUNET_assert (our_hello != NULL);
2744 GNUNET_STATISTICS_update (stats,
2745 gettext_noop ("# active neighbours"),
2748 n = GNUNET_malloc (sizeof (struct NeighbourList));
2749 n->next = neighbours;
2753 GNUNET_TIME_relative_to_absolute
2754 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2755 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2756 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2757 MAX_BANDWIDTH_CARRY_S);
2761 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2763 rl = GNUNET_malloc (sizeof (struct ReadyList));
2765 rl->next = n->plugins;
2768 rl->addresses = NULL;
2772 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2774 n->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2775 &neighbour_timeout_task, n);
2778 GNUNET_STATISTICS_update (stats,
2779 gettext_noop ("# peerinfo new neighbor iterate requests"),
2782 GNUNET_STATISTICS_update (stats,
2783 gettext_noop ("# outstanding peerinfo iterate requests"),
2786 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2787 GNUNET_TIME_UNIT_FOREVER_REL,
2788 &add_hello_for_peer, n);
2790 GNUNET_STATISTICS_update (stats,
2791 gettext_noop ("# HELLO's sent to new neighbors"),
2794 transmit_to_peer (NULL, NULL, 0,
2795 HELLO_ADDRESS_EXPIRATION,
2796 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2804 * Function called after we have checked if communicating
2805 * with a given peer is acceptable.
2807 * @param cls closure
2808 * @param n NULL if communication is not acceptable
2810 typedef void (*SetupContinuation)(void *cls,
2811 struct NeighbourList *n);
2815 * Information kept for each client registered to perform
2821 * This is a linked list.
2823 struct Blacklisters *next;
2826 * This is a linked list.
2828 struct Blacklisters *prev;
2831 * Client responsible for this entry.
2833 struct GNUNET_SERVER_Client *client;
2836 * Blacklist check that we're currently performing.
2838 struct BlacklistCheck *bc;
2844 * Head of DLL of blacklisting clients.
2846 static struct Blacklisters *bl_head;
2849 * Tail of DLL of blacklisting clients.
2851 static struct Blacklisters *bl_tail;
2855 * Context we use when performing a blacklist check.
2857 struct BlacklistCheck
2861 * This is a linked list.
2863 struct BlacklistCheck *next;
2866 * This is a linked list.
2868 struct BlacklistCheck *prev;
2871 * Peer being checked.
2873 struct GNUNET_PeerIdentity peer;
2876 * Option for setup neighbour afterwards.
2881 * Continuation to call with the result.
2883 SetupContinuation cont;
2891 * Current transmission request handle for this client, or NULL if no
2892 * request is pending.
2894 struct GNUNET_CONNECTION_TransmitHandle *th;
2897 * Our current position in the blacklisters list.
2899 struct Blacklisters *bl_pos;
2902 * Current task performing the check.
2904 GNUNET_SCHEDULER_TaskIdentifier task;
2909 * Head of DLL of active blacklisting queries.
2911 static struct BlacklistCheck *bc_head;
2914 * Tail of DLL of active blacklisting queries.
2916 static struct BlacklistCheck *bc_tail;
2920 * Perform next action in the blacklist check.
2922 * @param cls the 'struct BlacklistCheck*'
2926 do_blacklist_check (void *cls,
2927 const struct GNUNET_SCHEDULER_TaskContext *tc);
2931 * Transmit blacklist query to the client.
2933 * @param cls the 'struct BlacklistCheck'
2934 * @param size number of bytes allowed
2935 * @param buf where to copy the message
2936 * @return number of bytes copied to buf
2939 transmit_blacklist_message (void *cls,
2943 struct BlacklistCheck *bc = cls;
2944 struct Blacklisters *bl;
2945 struct BlacklistMessage bm;
2950 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2951 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
2956 bm.header.size = htons (sizeof (struct BlacklistMessage));
2957 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2958 bm.is_allowed = htonl (0);
2960 memcpy (buf, &bm, sizeof (bm));
2961 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2967 * Perform next action in the blacklist check.
2969 * @param cls the 'struct BlacklistCheck*'
2973 do_blacklist_check (void *cls,
2974 const struct GNUNET_SCHEDULER_TaskContext *tc)
2976 struct BlacklistCheck *bc = cls;
2977 struct Blacklisters *bl;
2979 bc->task = GNUNET_SCHEDULER_NO_TASK;
2983 bc->cont (bc->cont_cls,
2984 setup_new_neighbour (&bc->peer, bc->do_hello));
2991 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
2992 sizeof (struct BlacklistMessage),
2993 GNUNET_TIME_UNIT_FOREVER_REL,
2994 &transmit_blacklist_message,
3001 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
3002 * does not yet exist, check the blacklist. If the blacklist says creating
3003 * one is acceptable, create one and call the continuation; otherwise
3004 * call the continuation with NULL.
3006 * @param peer peer to setup or look up a struct NeighbourList for
3007 * @param do_hello should we also schedule sending our HELLO to the peer
3008 * if this is a new record
3009 * @param cont function to call with the 'struct NeigbhbourList*'
3010 * @param cont_cls closure for cont
3013 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
3015 SetupContinuation cont,
3018 struct NeighbourList *n;
3019 struct BlacklistCheck *bc;
3021 n = find_neighbour(peer);
3028 if (bl_head == NULL)
3031 cont (cont_cls, setup_new_neighbour (peer, do_hello));
3033 setup_new_neighbour(peer, do_hello);
3036 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3037 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3039 bc->do_hello = do_hello;
3041 bc->cont_cls = cont_cls;
3042 bc->bl_pos = bl_head;
3043 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3049 * Function called with the result of querying a new blacklister about
3050 * it being allowed (or not) to continue to talk to an existing neighbour.
3052 * @param cls the original 'struct NeighbourList'
3053 * @param n NULL if we need to disconnect
3056 confirm_or_drop_neighbour (void *cls,
3057 struct NeighbourList *n)
3059 struct NeighbourList * orig = cls;
3063 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3064 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&orig->id),
3065 "confirm_or_drop_neighboUr");
3066 disconnect_neighbour (orig, GNUNET_NO);
3072 * Handle a request to start a blacklist.
3074 * @param cls closure (always NULL)
3075 * @param client identification of the client
3076 * @param message the actual message
3079 handle_blacklist_init (void *cls,
3080 struct GNUNET_SERVER_Client *client,
3081 const struct GNUNET_MessageHeader *message)
3083 struct Blacklisters *bl;
3084 struct BlacklistCheck *bc;
3085 struct NeighbourList *n;
3090 if (bl->client == client)
3093 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3098 bl = GNUNET_malloc (sizeof (struct Blacklisters));
3099 bl->client = client;
3100 GNUNET_SERVER_client_keep (client);
3101 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
3102 /* confirm that all existing connections are OK! */
3106 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3107 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3109 bc->do_hello = GNUNET_NO;
3110 bc->cont = &confirm_or_drop_neighbour;
3113 if (n == neighbours) /* all would wait for the same client, no need to
3114 create more than just the first task right now */
3115 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3123 * Handle a request to blacklist a peer.
3125 * @param cls closure (always NULL)
3126 * @param client identification of the client
3127 * @param message the actual message
3130 handle_blacklist_reply (void *cls,
3131 struct GNUNET_SERVER_Client *client,
3132 const struct GNUNET_MessageHeader *message)
3134 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
3135 struct Blacklisters *bl;
3136 struct BlacklistCheck *bc;
3139 while ( (bl != NULL) &&
3140 (bl->client != client) )
3144 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3149 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
3151 bc->cont (bc->cont_cls, NULL);
3152 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
3157 bc->bl_pos = bc->bl_pos->next;
3158 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3161 /* check if any other bc's are waiting for this blacklister */
3165 if ( (bc->bl_pos == bl) &&
3166 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
3167 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3175 * Send periodic PING messages to a given foreign address.
3177 * @param cls our 'struct PeriodicValidationContext*'
3178 * @param tc task context
3181 send_periodic_ping (void *cls,
3182 const struct GNUNET_SCHEDULER_TaskContext *tc)
3184 struct ForeignAddressList *peer_address = cls;
3185 struct TransportPlugin *tp;
3186 struct ValidationEntry *va;
3187 struct NeighbourList *neighbour;
3188 struct TransportPingMessage ping;
3189 struct CheckAddressExistsClosure caec;
3191 uint16_t hello_size;
3195 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3196 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3198 tp = peer_address->ready_list->plugin;
3199 neighbour = peer_address->ready_list->neighbour;
3200 if (GNUNET_YES != neighbour->public_key_valid)
3202 /* no public key yet, try again later */
3203 schedule_next_ping (peer_address);
3206 caec.addr = peer_address->addr;
3207 caec.addrlen = peer_address->addrlen;
3208 caec.tname = tp->short_name;
3209 caec.session = peer_address->session;
3210 caec.exists = GNUNET_NO;
3211 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3212 &check_address_exists,
3214 if (caec.exists == GNUNET_YES)
3216 /* During validation attempts we will likely trigger the other
3217 peer trying to validate our address which in turn will cause
3218 it to send us its HELLO, so we expect to hit this case rather
3219 frequently. Only print something if we are very verbose. */
3220 #if DEBUG_TRANSPORT > 1
3221 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3222 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3223 (peer_address->addr != NULL)
3224 ? a2s (tp->short_name,
3226 peer_address->addrlen)
3229 GNUNET_i2s (&neighbour->id));
3231 schedule_next_ping (peer_address);
3234 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3235 va->transport_name = GNUNET_strdup (tp->short_name);
3236 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
3238 va->send_time = GNUNET_TIME_absolute_get();
3239 va->session = peer_address->session;
3240 if (peer_address->addr != NULL)
3242 va->addr = (const void*) &va[1];
3243 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3244 va->addrlen = peer_address->addrlen;
3246 memcpy(&va->publicKey,
3247 &neighbour->publicKey,
3248 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3250 va->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_VERIFICATION_TIMEOUT,
3251 &timeout_hello_validation,
3253 GNUNET_CONTAINER_multihashmap_put (validation_map,
3254 &neighbour->id.hashPubKey,
3256 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3258 if (peer_address->validated != GNUNET_YES)
3259 hello_size = GNUNET_HELLO_size(our_hello);
3263 tsize = sizeof(struct TransportPingMessage) + hello_size;
3265 if (peer_address->addr != NULL)
3267 slen = strlen (tp->short_name) + 1;
3268 tsize += slen + peer_address->addrlen;
3272 slen = 0; /* make gcc happy */
3274 message_buf = GNUNET_malloc(tsize);
3275 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3276 ping.challenge = htonl(va->challenge);
3277 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3278 if (peer_address->validated != GNUNET_YES)
3280 memcpy(message_buf, our_hello, hello_size);
3283 if (peer_address->addr != NULL)
3285 ping.header.size = htons(sizeof(struct TransportPingMessage) +
3286 peer_address->addrlen +
3288 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3291 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3293 peer_address->addrlen);
3297 ping.header.size = htons(sizeof(struct TransportPingMessage));
3300 memcpy(&message_buf[hello_size],
3302 sizeof(struct TransportPingMessage));
3304 #if DEBUG_TRANSPORT_REVALIDATION
3305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3306 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s'\n",
3307 (peer_address->addr != NULL)
3308 ? a2s (peer_address->plugin->short_name,
3310 peer_address->addrlen)
3313 GNUNET_i2s (&neighbour->id),
3314 "HELLO", hello_size,
3317 if (peer_address->validated != GNUNET_YES)
3318 GNUNET_STATISTICS_update (stats,
3319 gettext_noop ("# PING with HELLO messages sent"),
3323 GNUNET_STATISTICS_update (stats,
3324 gettext_noop ("# PING without HELLO messages sent"),
3327 GNUNET_STATISTICS_update (stats,
3328 gettext_noop ("# PING messages sent for re-validation"),
3331 transmit_to_peer (NULL, peer_address,
3332 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3333 HELLO_VERIFICATION_TIMEOUT,
3335 GNUNET_YES, neighbour);
3336 GNUNET_free(message_buf);
3337 schedule_next_ping (peer_address);
3342 * Schedule the job that will cause us to send a PING to the
3343 * foreign address to evaluate its validity and latency.
3345 * @param fal address to PING
3348 schedule_next_ping (struct ForeignAddressList *fal)
3350 struct GNUNET_TIME_Relative delay;
3352 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3354 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3355 delay.rel_value /= 2; /* do before expiration */
3356 delay = GNUNET_TIME_relative_min (delay,
3357 LATENCY_EVALUATION_MAX_DELAY);
3358 if (GNUNET_YES != fal->estimated)
3360 delay = GNUNET_TIME_UNIT_ZERO;
3361 fal->estimated = GNUNET_YES;
3363 if (GNUNET_YES == fal->connected)
3365 delay = GNUNET_TIME_relative_min (delay,
3366 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3368 /* FIXME: also adjust delay based on how close the last
3369 observed latency is to the latency of the best alternative */
3370 /* bound how fast we can go */
3371 delay = GNUNET_TIME_relative_max (delay,
3372 GNUNET_TIME_UNIT_SECONDS);
3373 /* randomize a bit (to avoid doing all at the same time) */
3374 delay.rel_value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3375 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(delay,
3376 &send_periodic_ping,
3384 * Function that will be called if we receive some payload
3385 * from another peer.
3387 * @param message the payload
3388 * @param n peer who claimed to be the sender
3389 * @param ats ATS information
3390 * @param ats_count numbers of elements following the ats struct (excluding the 0-terminator)
3393 handle_payload_message (const struct GNUNET_MessageHeader *message,
3394 struct NeighbourList *n, struct GNUNET_TRANSPORT_ATS_Information *ats, uint32_t ats_count)
3396 struct InboundMessage *im;
3397 struct TransportClient *cpos;
3400 msize = ntohs (message->size);
3401 if (n->received_pong == GNUNET_NO)
3403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3404 "Received message of type %u and size %u from `%4s', but no pong yet!!\n",
3405 ntohs (message->type),
3406 ntohs (message->size),
3407 GNUNET_i2s (&n->id));
3408 GNUNET_free_non_null (n->pre_connect_message_buffer);
3409 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3410 memcpy (n->pre_connect_message_buffer, message, msize);
3415 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3416 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
3417 ntohs (message->type),
3418 ntohs (message->size),
3419 GNUNET_i2s (&n->id));
3421 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3424 n->quota_violation_count++;
3426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3427 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3428 n->in_tracker.available_bytes_per_s__,
3429 n->quota_violation_count);
3431 /* Discount 32k per violation */
3432 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3437 if (n->quota_violation_count > 0)
3439 /* try to add 32k back */
3440 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3442 n->quota_violation_count--;
3445 GNUNET_STATISTICS_update (stats,
3446 gettext_noop ("# payload received from other peers"),
3450 /* transmit message to all clients */
3451 im = GNUNET_malloc (sizeof (struct InboundMessage) + ats_count * sizeof(struct GNUNET_TRANSPORT_ATS_Information) + msize);
3452 im->header.size = htons (sizeof (struct InboundMessage) + ats_count * sizeof(struct GNUNET_TRANSPORT_ATS_Information) + msize);
3453 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3455 im->ats_count = htonl(ats_count);
3456 /* insert ATS elements */
3457 memcpy (&(im->ats), ats, ats_count * sizeof(struct GNUNET_TRANSPORT_ATS_Information));
3458 /* insert ATS terminator */
3459 (&im->ats)[ats_count].type = htonl(0);
3460 (&im->ats)[ats_count].value = htonl(0);
3461 /* insert msg after terminator */
3462 memcpy (&(&im->ats)[ats_count+1], message, msize);
3465 while (cpos != NULL)
3467 transmit_to_client (cpos, &im->header, GNUNET_YES);
3475 * Iterator over hash map entries. Checks if the given validation
3476 * entry is for the same challenge as what is given in the PONG.
3478 * @param cls the 'struct TransportPongMessage*'
3479 * @param key peer identity
3480 * @param value value in the hash map ('struct ValidationEntry')
3481 * @return GNUNET_YES if we should continue to
3482 * iterate (mismatch), GNUNET_NO if not (entry matched)
3485 check_pending_validation (void *cls,
3486 const GNUNET_HashCode * key,
3489 const struct TransportPongMessage *pong = cls;
3490 struct ValidationEntry *ve = value;
3491 struct AddValidatedAddressContext avac;
3492 unsigned int challenge = ntohl(pong->challenge);
3493 struct GNUNET_HELLO_Message *hello;
3494 struct GNUNET_PeerIdentity target;
3495 struct NeighbourList *n;
3496 struct ForeignAddressList *fal;
3497 struct OwnAddressList *oal;
3498 struct TransportPlugin *tp;
3499 struct GNUNET_MessageHeader *prem;
3505 ps = ntohs (pong->header.size);
3506 if (ps < sizeof (struct TransportPongMessage))
3508 GNUNET_break_op (0);
3511 addr = (const char*) &pong[1];
3512 slen = strlen (ve->transport_name) + 1;
3513 if ( (ps - sizeof (struct TransportPongMessage) < slen) ||
3514 (ve->challenge != challenge) ||
3515 (addr[slen-1] != '\0') ||
3516 (0 != strcmp (addr, ve->transport_name)) ||
3517 (ntohl (pong->purpose.size)
3518 != sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3520 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3521 sizeof (struct GNUNET_PeerIdentity) + ps - sizeof (struct TransportPongMessage)) )
3526 alen = ps - sizeof (struct TransportPongMessage) - slen;
3527 switch (ntohl (pong->purpose.purpose))
3529 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN:
3530 if ( (ve->addrlen + slen != ntohl (pong->addrlen)) ||
3531 (0 != memcmp (&addr[slen],
3535 return GNUNET_YES; /* different entry, keep trying! */
3537 if (0 != memcmp (&pong->pid,
3539 sizeof (struct GNUNET_PeerIdentity)))
3541 GNUNET_break_op (0);
3545 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
3550 GNUNET_break_op (0);
3555 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3556 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
3558 a2s (ve->transport_name,
3559 (const struct sockaddr *) ve->addr,
3561 ve->transport_name);
3564 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING:
3565 if (0 != memcmp (&pong->pid,
3567 sizeof (struct GNUNET_PeerIdentity)))
3569 GNUNET_break_op (0);
3572 if (ve->addrlen != 0)
3574 /* must have been for a different validation entry */
3577 tp = find_transport (ve->transport_name);
3583 oal = tp->addresses;
3586 if ( (oal->addrlen == alen) &&
3587 (0 == memcmp (&oal[1],
3595 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3596 _("Not accepting PONG with address `%s' since I cannot confirm having this address.\n"),
3597 a2s (ve->transport_name,
3603 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING,
3608 GNUNET_break_op (0);
3613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3614 "Confirmed that peer `%4s' is talking to us using address `%s' (%s) for us.\n",
3616 a2s (ve->transport_name,
3619 ve->transport_name);
3623 GNUNET_break_op (0);
3626 if (GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value == 0)
3628 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3629 _("Received expired signature. Check system time.\n"));
3632 GNUNET_STATISTICS_update (stats,
3633 gettext_noop ("# address validation successes"),
3636 /* create the updated HELLO */
3637 GNUNET_CRYPTO_hash (&ve->publicKey,
3638 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3639 &target.hashPubKey);
3640 if (ve->addr != NULL)
3642 avac.done = GNUNET_NO;
3644 hello = GNUNET_HELLO_create (&ve->publicKey,
3645 &add_validated_address,
3647 GNUNET_PEERINFO_add_peer (peerinfo,
3649 GNUNET_free (hello);
3651 n = find_neighbour (&target);
3654 n->publicKey = ve->publicKey;
3655 n->public_key_valid = GNUNET_YES;
3656 fal = add_peer_address (n,
3661 GNUNET_assert (fal != NULL);
3662 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
3663 fal->validated = GNUNET_YES;
3664 mark_address_connected (fal);
3665 GNUNET_STATISTICS_update (stats,
3666 gettext_noop ("# peer addresses considered valid"),
3669 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
3670 schedule_next_ping (fal);
3671 if (n->latency.rel_value == GNUNET_TIME_UNIT_FOREVER_REL.rel_value)
3672 n->latency = fal->latency;
3674 n->latency.rel_value = (fal->latency.rel_value + n->latency.rel_value) / 2;
3676 n->distance = fal->distance;
3677 if (GNUNET_NO == n->received_pong)
3679 n->received_pong = GNUNET_YES;
3680 notify_clients_connect (&target, n->latency, n->distance);
3681 if (NULL != (prem = n->pre_connect_message_buffer))
3683 n->pre_connect_message_buffer = NULL;
3684 struct GNUNET_TRANSPORT_ATS_Information * ats = GNUNET_malloc(2 * sizeof(struct GNUNET_TRANSPORT_ATS_Information));
3685 ats[0].type = htonl(GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY);
3686 if (n->latency.rel_value <= UINT32_MAX)
3687 ats[0].value = htonl((uint32_t) n->latency.rel_value);
3689 ats[0].value = htonl(UINT32_MAX);
3690 ats[1].type = htonl(GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
3691 ats[1].value = htonl(n->distance);
3692 //handle_payload_message (prem, n, NULL, 0);
3693 handle_payload_message (prem, n, ats, 2);
3698 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3700 GNUNET_SCHEDULER_cancel (n->retry_task);
3701 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3702 try_transmission_to_peer (n);
3706 /* clean up validation entry */
3707 GNUNET_assert (GNUNET_YES ==
3708 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3711 abort_validation (NULL, NULL, ve);
3717 * Function that will be called if we receive a validation
3718 * of an address challenge that we transmitted to another
3719 * peer. Note that the validation should only be considered
3720 * acceptable if the challenge matches AND if the sender
3721 * address is at least a plausible address for this peer
3722 * (otherwise we may be seeing a MiM attack).
3724 * @param cls closure
3725 * @param message the pong message
3726 * @param peer who responded to our challenge
3727 * @param sender_address string describing our sender address (as observed
3728 * by the other peer in binary format)
3729 * @param sender_address_len number of bytes in 'sender_address'
3732 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3733 const struct GNUNET_PeerIdentity *peer,
3734 const char *sender_address,
3735 size_t sender_address_len)
3737 #if DEBUG_TRANSPORT > 1
3738 /* we get tons of these that just get discarded, only log
3739 if we are quite verbose */
3740 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3741 "Receiving `%s' message from `%4s'.\n", "PONG",
3744 GNUNET_STATISTICS_update (stats,
3745 gettext_noop ("# PONG messages received"),
3748 if (GNUNET_SYSERR !=
3749 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3751 &check_pending_validation,
3754 /* This is *expected* to happen a lot since we send
3755 PONGs to *all* known addresses of the sender of
3756 the PING, so most likely we get multiple PONGs
3757 per PING, and all but the first PONG will end up
3758 here. So really we should not print anything here
3759 unless we want to be very, very verbose... */
3760 #if DEBUG_TRANSPORT > 2
3761 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3762 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3774 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3776 * @param cls the 'struct ValidationEntry*'
3777 * @param neighbour neighbour to validate, NULL if validation failed
3780 transmit_hello_and_ping (void *cls,
3781 struct NeighbourList *neighbour)
3783 struct ValidationEntry *va = cls;
3784 struct ForeignAddressList *peer_address;
3785 struct TransportPingMessage ping;
3786 uint16_t hello_size;
3789 struct GNUNET_PeerIdentity id;
3792 GNUNET_CRYPTO_hash (&va->publicKey,
3793 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3795 if (neighbour == NULL)
3797 /* FIXME: stats... */
3798 GNUNET_break (GNUNET_OK ==
3799 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3802 abort_validation (NULL, NULL, va);
3805 neighbour->publicKey = va->publicKey;
3806 neighbour->public_key_valid = GNUNET_YES;
3807 peer_address = add_peer_address (neighbour,
3808 va->transport_name, NULL,
3809 (const void*) &va[1],
3811 if (peer_address == NULL)
3813 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3814 "Failed to add peer `%4s' for plugin `%s'\n",
3815 GNUNET_i2s (&neighbour->id),
3816 va->transport_name);
3817 GNUNET_break (GNUNET_OK ==
3818 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3821 abort_validation (NULL, NULL, va);
3824 hello_size = GNUNET_HELLO_size(our_hello);
3825 slen = strlen(va->transport_name) + 1;
3826 tsize = sizeof(struct TransportPingMessage) + hello_size + va->addrlen + slen;
3827 message_buf = GNUNET_malloc(tsize);
3828 ping.challenge = htonl(va->challenge);
3829 ping.header.size = htons(sizeof(struct TransportPingMessage) + slen + va->addrlen);
3830 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3831 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3832 memcpy(message_buf, our_hello, hello_size);
3833 memcpy(&message_buf[hello_size],
3835 sizeof(struct TransportPingMessage));
3836 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3839 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3843 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3844 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3847 : a2s (va->transport_name,
3848 (const void*) &va[1], va->addrlen),
3850 GNUNET_i2s (&neighbour->id),
3851 "HELLO", hello_size,
3852 "PING", sizeof (struct TransportPingMessage) + va->addrlen + slen);
3855 GNUNET_STATISTICS_update (stats,
3856 gettext_noop ("# PING messages sent for initial validation"),
3859 transmit_to_peer (NULL, peer_address,
3860 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3861 HELLO_VERIFICATION_TIMEOUT,
3863 GNUNET_YES, neighbour);
3864 GNUNET_free(message_buf);
3869 * Check if the given address is already being validated; if not,
3870 * append the given address to the list of entries that are being be
3871 * validated and initiate validation.
3873 * @param cls closure ('struct CheckHelloValidatedContext *')
3874 * @param tname name of the transport
3875 * @param expiration expiration time
3876 * @param addr the address
3877 * @param addrlen length of the address
3878 * @return GNUNET_OK (always)
3881 run_validation (void *cls,
3883 struct GNUNET_TIME_Absolute expiration,
3887 struct CheckHelloValidatedContext *chvc = cls;
3888 struct GNUNET_PeerIdentity id;
3889 struct TransportPlugin *tp;
3890 struct ValidationEntry *va;
3891 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3892 struct CheckAddressExistsClosure caec;
3893 struct OwnAddressList *oal;
3895 GNUNET_assert (addr != NULL);
3897 GNUNET_STATISTICS_update (stats,
3898 gettext_noop ("# peer addresses scheduled for validation"),
3901 tp = find_transport (tname);
3904 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3905 GNUNET_ERROR_TYPE_BULK,
3907 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3909 GNUNET_STATISTICS_update (stats,
3910 gettext_noop ("# peer addresses not validated (plugin not available)"),
3915 /* check if this is one of our own addresses */
3916 oal = tp->addresses;
3919 if ( (oal->addrlen == addrlen) &&
3920 (0 == memcmp (&oal[1],
3924 /* not plausible, this address is equivalent to our own address! */
3925 GNUNET_STATISTICS_update (stats,
3926 gettext_noop ("# peer addresses not validated (loopback)"),
3933 GNUNET_HELLO_get_key (chvc->hello, &pk);
3934 GNUNET_CRYPTO_hash (&pk,
3936 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3939 if (is_blacklisted(&id, tp))
3942 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3943 "Attempted to validate blacklisted peer `%s' using `%s'!\n",
3951 caec.addrlen = addrlen;
3952 caec.session = NULL;
3954 caec.exists = GNUNET_NO;
3955 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3956 &check_address_exists,
3958 if (caec.exists == GNUNET_YES)
3960 /* During validation attempts we will likely trigger the other
3961 peer trying to validate our address which in turn will cause
3962 it to send us its HELLO, so we expect to hit this case rather
3963 frequently. Only print something if we are very verbose. */
3964 #if DEBUG_TRANSPORT > 1
3965 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3966 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3967 a2s (tname, addr, addrlen),
3971 GNUNET_STATISTICS_update (stats,
3972 gettext_noop ("# peer addresses not validated (in progress)"),
3977 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
3980 va->transport_name = GNUNET_strdup (tname);
3981 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
3983 va->send_time = GNUNET_TIME_absolute_get();
3984 va->addr = (const void*) &va[1];
3985 memcpy (&va[1], addr, addrlen);
3986 va->addrlen = addrlen;
3987 GNUNET_HELLO_get_key (chvc->hello,
3989 va->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_VERIFICATION_TIMEOUT,
3990 &timeout_hello_validation,
3992 GNUNET_CONTAINER_multihashmap_put (validation_map,
3995 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3996 setup_peer_check_blacklist (&id, GNUNET_NO,
3997 &transmit_hello_and_ping,
4004 * Check if addresses in validated hello "h" overlap with
4005 * those in "chvc->hello" and validate the rest.
4007 * @param cls closure
4008 * @param peer id of the peer, NULL for last call
4009 * @param h hello message for the peer (can be NULL)
4012 check_hello_validated (void *cls,
4013 const struct GNUNET_PeerIdentity *peer,
4014 const struct GNUNET_HELLO_Message *h)
4016 struct CheckHelloValidatedContext *chvc = cls;
4017 struct GNUNET_HELLO_Message *plain_hello;
4018 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
4019 struct GNUNET_PeerIdentity target;
4020 struct NeighbourList *n;
4024 GNUNET_STATISTICS_update (stats,
4025 gettext_noop ("# outstanding peerinfo iterate requests"),
4029 if (GNUNET_NO == chvc->hello_known)
4031 /* notify PEERINFO about the peer now, so that we at least
4032 have the public key if some other component needs it */
4033 GNUNET_HELLO_get_key (chvc->hello, &pk);
4034 GNUNET_CRYPTO_hash (&pk,
4035 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4036 &target.hashPubKey);
4037 plain_hello = GNUNET_HELLO_create (&pk,
4040 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
4041 GNUNET_free (plain_hello);
4042 #if DEBUG_TRANSPORT_HELLO
4043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4044 "PEERINFO had no `%s' message for peer `%4s', full validation needed.\n",
4046 GNUNET_i2s (&target));
4048 GNUNET_STATISTICS_update (stats,
4049 gettext_noop ("# new HELLOs requiring full validation"),
4052 GNUNET_HELLO_iterate_addresses (chvc->hello,
4059 GNUNET_STATISTICS_update (stats,
4060 gettext_noop ("# duplicate HELLO (peer known)"),
4065 if (chvc->ve_count == 0)
4067 GNUNET_CONTAINER_DLL_remove (chvc_head,
4076 #if DEBUG_TRANSPORT_HELLO
4077 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4078 "PEERINFO had `%s' message for peer `%4s', validating only new addresses.\n",
4082 chvc->hello_known = GNUNET_YES;
4083 n = find_neighbour (peer);
4086 #if DEBUG_TRANSPORT_HELLO
4087 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4088 "Calling hello_iterate_addresses for %s!\n",
4091 GNUNET_HELLO_iterate_addresses (h,
4093 &add_to_foreign_address_list,
4095 try_transmission_to_peer (n);
4099 #if DEBUG_TRANSPORT_HELLO
4100 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4101 "No existing neighbor record for %s!\n",
4104 GNUNET_STATISTICS_update (stats,
4105 gettext_noop ("# no existing neighbour record (validating HELLO)"),
4109 GNUNET_STATISTICS_update (stats,
4110 gettext_noop ("# HELLO validations (update case)"),
4113 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
4115 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
4122 * Process HELLO-message.
4124 * @param plugin transport involved, may be NULL
4125 * @param message the actual message
4126 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
4129 process_hello (struct TransportPlugin *plugin,
4130 const struct GNUNET_MessageHeader *message)
4133 struct GNUNET_PeerIdentity target;
4134 const struct GNUNET_HELLO_Message *hello;
4135 struct CheckHelloValidatedContext *chvc;
4136 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
4137 #if DEBUG_TRANSPORT_HELLO > 2
4140 hsize = ntohs (message->size);
4141 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
4142 (hsize < sizeof (struct GNUNET_MessageHeader)))
4145 return GNUNET_SYSERR;
4147 GNUNET_STATISTICS_update (stats,
4148 gettext_noop ("# HELLOs received for validation"),
4152 /* first, check if load is too high */
4153 if (GNUNET_SCHEDULER_get_load (GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
4155 GNUNET_STATISTICS_update (stats,
4156 gettext_noop ("# HELLOs ignored due to high load"),
4159 #if DEBUG_TRANSPORT_HELLO
4160 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4161 "Ignoring `%s' for `%4s', load too high.\n",
4163 GNUNET_i2s (&target));
4167 hello = (const struct GNUNET_HELLO_Message *) message;
4168 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
4170 #if DEBUG_TRANSPORT_HELLO
4171 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4172 "Unable to get public key from `%s' for `%4s'!\n",
4174 GNUNET_i2s (&target));
4176 GNUNET_break_op (0);
4177 return GNUNET_SYSERR;
4180 GNUNET_CRYPTO_hash (&publicKey,
4181 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4182 &target.hashPubKey);
4184 #if DEBUG_TRANSPORT_HELLO
4185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4186 "Received `%s' message for `%4s'\n",
4188 GNUNET_i2s (&target));
4191 if (0 == memcmp (&my_identity,
4193 sizeof (struct GNUNET_PeerIdentity)))
4195 GNUNET_STATISTICS_update (stats,
4196 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
4202 while (NULL != chvc)
4204 if (GNUNET_HELLO_equals (hello,
4206 GNUNET_TIME_absolute_get ()).abs_value > 0)
4208 #if DEBUG_TRANSPORT_HELLO > 2
4209 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4210 "Received duplicate `%s' message for `%4s'; ignored\n",
4212 GNUNET_i2s (&target));
4214 return GNUNET_OK; /* validation already pending */
4216 if (GNUNET_HELLO_size(hello) == GNUNET_HELLO_size (chvc->hello))
4217 GNUNET_break (0 != memcmp (hello, chvc->hello,
4218 GNUNET_HELLO_size(hello)));
4223 struct NeighbourList *temp_neighbor = find_neighbour(&target);
4224 if ((NULL != temp_neighbor))
4226 fprintf(stderr, "Already know peer, ignoring hello\n");
4231 #if DEBUG_TRANSPORT_HELLO > 2
4234 my_id = GNUNET_strdup(GNUNET_i2s(plugin->env.my_identity));
4235 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4236 "%s: Starting validation of `%s' message for `%4s' via '%s' of size %u\n",
4239 GNUNET_i2s (&target),
4241 GNUNET_HELLO_size(hello));
4245 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
4247 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
4248 memcpy (&chvc[1], hello, hsize);
4249 GNUNET_CONTAINER_DLL_insert (chvc_head,
4252 /* finally, check if HELLO was previously validated
4253 (continuation will then schedule actual validation) */
4254 GNUNET_STATISTICS_update (stats,
4255 gettext_noop ("# peerinfo process hello iterate requests"),
4258 GNUNET_STATISTICS_update (stats,
4259 gettext_noop ("# outstanding peerinfo iterate requests"),
4262 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
4264 HELLO_VERIFICATION_TIMEOUT,
4265 &check_hello_validated, chvc);
4271 * The peer specified by the given neighbour has timed-out or a plugin
4272 * has disconnected. We may either need to do nothing (other plugins
4273 * still up), or trigger a full disconnect and clean up. This
4274 * function updates our state and does the necessary notifications.
4275 * Also notifies our clients that the neighbour is now officially
4278 * @param n the neighbour list entry for the peer
4279 * @param check GNUNET_YES to check if ALL addresses for this peer
4280 * are gone, GNUNET_NO to force a disconnect of the peer
4281 * regardless of whether other addresses exist.
4284 disconnect_neighbour (struct NeighbourList *n, int check)
4286 struct ReadyList *rpos;
4287 struct NeighbourList *npos;
4288 struct NeighbourList *nprev;
4289 struct MessageQueue *mq;
4290 struct ForeignAddressList *peer_addresses;
4291 struct ForeignAddressList *peer_pos;
4293 if (GNUNET_YES == check)
4296 while (NULL != rpos)
4298 peer_addresses = rpos->addresses;
4299 while (peer_addresses != NULL)
4301 if (GNUNET_YES == peer_addresses->connected)
4303 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4304 "NOT Disconnecting from `%4s', still have live addresses!\n",
4305 GNUNET_i2s (&n->id));
4306 return; /* still connected */
4308 peer_addresses = peer_addresses->next;
4314 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4315 "Disconnecting from `%4s'\n",
4316 GNUNET_i2s (&n->id));
4318 /* remove n from neighbours list */
4321 while ((npos != NULL) && (npos != n))
4326 GNUNET_assert (npos != NULL);
4328 neighbours = n->next;
4330 nprev->next = n->next;
4332 /* notify all clients about disconnect */
4333 if (GNUNET_YES == n->received_pong)
4334 notify_clients_disconnect (&n->id);
4336 /* clean up all plugins, cancel connections and pending transmissions */
4337 while (NULL != (rpos = n->plugins))
4339 n->plugins = rpos->next;
4340 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
4341 while (rpos->addresses != NULL)
4343 peer_pos = rpos->addresses;
4344 rpos->addresses = peer_pos->next;
4345 if (peer_pos->connected == GNUNET_YES)
4346 GNUNET_STATISTICS_update (stats,
4347 gettext_noop ("# connected addresses"),
4350 if (GNUNET_YES == peer_pos->validated)
4351 GNUNET_STATISTICS_update (stats,
4352 gettext_noop ("# peer addresses considered valid"),
4355 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
4357 GNUNET_SCHEDULER_cancel (peer_pos->revalidate_task);
4358 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
4360 GNUNET_free(peer_pos);
4365 /* free all messages on the queue */
4366 while (NULL != (mq = n->messages_head))
4368 GNUNET_STATISTICS_update (stats,
4369 gettext_noop ("# bytes in message queue for other peers"),
4370 - (int64_t) mq->message_buf_size,
4372 GNUNET_STATISTICS_update (stats,
4373 gettext_noop ("# bytes discarded due to disconnect"),
4374 mq->message_buf_size,
4376 GNUNET_CONTAINER_DLL_remove (n->messages_head,
4379 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
4381 sizeof(struct GNUNET_PeerIdentity)));
4384 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
4386 GNUNET_SCHEDULER_cancel (n->timeout_task);
4387 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
4389 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
4391 GNUNET_SCHEDULER_cancel (n->retry_task);
4392 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
4394 if (n->piter != NULL)
4396 GNUNET_PEERINFO_iterate_cancel (n->piter);
4397 GNUNET_STATISTICS_update (stats,
4398 gettext_noop ("# outstanding peerinfo iterate requests"),
4403 /* finally, free n itself */
4404 GNUNET_STATISTICS_update (stats,
4405 gettext_noop ("# active neighbours"),
4408 GNUNET_free_non_null (n->pre_connect_message_buffer);
4414 * We have received a PING message from someone. Need to send a PONG message
4415 * in response to the peer by any means necessary.
4418 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
4419 const struct GNUNET_PeerIdentity *peer,
4420 struct Session *session,
4421 const char *sender_address,
4422 uint16_t sender_address_len)
4424 struct TransportPlugin *plugin = cls;
4425 struct SessionHeader *session_header = (struct SessionHeader*) session;
4426 struct TransportPingMessage *ping;
4427 struct TransportPongMessage *pong;
4428 struct NeighbourList *n;
4429 struct ReadyList *rl;
4430 struct ForeignAddressList *fal;
4431 struct OwnAddressList *oal;
4436 if (ntohs (message->size) < sizeof (struct TransportPingMessage))
4438 GNUNET_break_op (0);
4439 return GNUNET_SYSERR;
4442 ping = (struct TransportPingMessage *) message;
4443 if (0 != memcmp (&ping->target,
4444 plugin->env.my_identity,
4445 sizeof (struct GNUNET_PeerIdentity)))
4447 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4448 _("Received `%s' message from `%s' destined for `%s' which is not me!\n"),
4450 (sender_address != NULL)
4451 ? a2s (plugin->short_name,
4452 (const struct sockaddr *)sender_address,
4455 GNUNET_i2s (&ping->target));
4456 return GNUNET_SYSERR;
4459 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4460 "Processing `%s' from `%s'\n",
4462 (sender_address != NULL)
4463 ? a2s (plugin->short_name,
4464 (const struct sockaddr *)sender_address,
4468 GNUNET_STATISTICS_update (stats,
4469 gettext_noop ("# PING messages received"),
4472 addr = (const char*) &ping[1];
4473 alen = ntohs (message->size) - sizeof (struct TransportPingMessage);
4474 slen = strlen (plugin->short_name) + 1;
4477 /* peer wants to confirm that we have an outbound connection to him */
4478 if (session == NULL)
4480 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4481 _("Refusing to create PONG since I do not have a session with `%s'.\n"),
4483 return GNUNET_SYSERR;
4485 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4486 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4487 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4488 pong->purpose.size =
4489 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4491 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4492 sizeof (struct GNUNET_PeerIdentity) + sender_address_len + slen);
4493 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING);
4494 pong->challenge = ping->challenge;
4495 pong->addrlen = htonl(sender_address_len + slen);
4498 sizeof(struct GNUNET_PeerIdentity));
4502 memcpy (&((char*)&pong[1])[slen],
4504 sender_address_len);
4505 if (GNUNET_TIME_absolute_get_remaining (session_header->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4)
4507 /* create / update cached sig */
4509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4510 "Creating PONG signature to indicate active connection.\n");
4512 session_header->pong_sig_expires = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
4513 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4514 GNUNET_assert (GNUNET_OK ==
4515 GNUNET_CRYPTO_rsa_sign (my_private_key,
4517 &session_header->pong_signature));
4521 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4523 memcpy (&pong->signature,
4524 &session_header->pong_signature,
4525 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4531 /* peer wants to confirm that this is one of our addresses */
4535 plugin->api->check_address (plugin->api->cls,
4539 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4540 _("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
4541 a2s (plugin->short_name,
4546 oal = plugin->addresses;
4549 if ( (oal->addrlen == alen) &&
4556 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
4557 pong->header.size = htons (sizeof (struct TransportPongMessage) + alen + slen);
4558 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4559 pong->purpose.size =
4560 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4562 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4563 sizeof (struct GNUNET_PeerIdentity) + alen + slen);
4564 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
4565 pong->challenge = ping->challenge;
4566 pong->addrlen = htonl(alen + slen);
4569 sizeof(struct GNUNET_PeerIdentity));
4570 memcpy (&pong[1], plugin->short_name, slen);
4571 memcpy (&((char*)&pong[1])[slen], addr, alen);
4572 if ( (oal != NULL) &&
4573 (GNUNET_TIME_absolute_get_remaining (oal->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4) )
4575 /* create / update cached sig */
4577 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4578 "Creating PONG signature to indicate ownership.\n");
4580 oal->pong_sig_expires = GNUNET_TIME_absolute_min (oal->expires,
4581 GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4582 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4583 GNUNET_assert (GNUNET_OK ==
4584 GNUNET_CRYPTO_rsa_sign (my_private_key,
4586 &oal->pong_signature));
4587 memcpy (&pong->signature,
4588 &oal->pong_signature,
4589 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4591 else if (oal == NULL)
4593 /* not using cache (typically DV-only) */
4594 pong->expiration = GNUNET_TIME_absolute_hton (GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4595 GNUNET_assert (GNUNET_OK ==
4596 GNUNET_CRYPTO_rsa_sign (my_private_key,
4602 /* can used cached version */
4603 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4604 memcpy (&pong->signature,
4605 &oal->pong_signature,
4606 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4609 n = find_neighbour(peer);
4610 GNUNET_assert (n != NULL);
4611 /* first try reliable response transmission */
4615 fal = rl->addresses;
4618 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4621 ntohs (pong->header.size),
4622 TRANSPORT_PONG_PRIORITY,
4623 HELLO_VERIFICATION_TIMEOUT,
4631 GNUNET_STATISTICS_update (stats,
4632 gettext_noop ("# PONGs unicast via reliable transport"),
4642 /* no reliable method found, do multicast */
4643 GNUNET_STATISTICS_update (stats,
4644 gettext_noop ("# PONGs multicast to all available addresses"),
4650 fal = rl->addresses;
4653 transmit_to_peer(NULL, fal,
4654 TRANSPORT_PONG_PRIORITY,
4655 HELLO_VERIFICATION_TIMEOUT,
4657 ntohs(pong->header.size),
4670 * Function called by the plugin for each received message.
4671 * Update data volumes, possibly notify plugins about
4672 * reducing the rate at which they read from the socket
4673 * and generally forward to our receive callback.
4675 * @param cls the "struct TransportPlugin *" we gave to the plugin
4676 * @param peer (claimed) identity of the other peer
4677 * @param message the message, NULL if we only care about
4678 * learning about the delay until we should receive again
4679 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
4680 * @param session identifier used for this session (can be NULL)
4681 * @param sender_address binary address of the sender (if observed)
4682 * @param sender_address_len number of bytes in sender_address
4683 * @return how long in ms the plugin should wait until receiving more data
4684 * (plugins that do not support this, can ignore the return value)
4686 static struct GNUNET_TIME_Relative
4687 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4688 const struct GNUNET_MessageHeader *message,
4690 struct Session *session,
4691 const char *sender_address,
4692 uint16_t sender_address_len)
4694 struct TransportPlugin *plugin = cls;
4695 struct ReadyList *service_context;
4696 struct ForeignAddressList *peer_address;
4698 struct NeighbourList *n;
4699 struct GNUNET_TRANSPORT_ATS_Information * ats;
4700 struct GNUNET_TIME_Relative ret;
4701 if (is_blacklisted (peer, plugin))
4702 return GNUNET_TIME_UNIT_FOREVER_REL;
4704 n = find_neighbour (peer);
4706 n = setup_new_neighbour (peer, GNUNET_YES);
4707 service_context = n->plugins;
4708 while ((service_context != NULL) && (plugin != service_context->plugin))
4709 service_context = service_context->next;
4710 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4711 peer_address = NULL;
4712 if (message != NULL)
4714 if ( (session != NULL) ||
4715 (sender_address != NULL) )
4716 peer_address = add_peer_address (n,
4720 sender_address_len);
4721 if (peer_address != NULL)
4723 peer_address->distance = distance;
4724 if (GNUNET_YES == peer_address->validated)
4725 mark_address_connected (peer_address);
4726 peer_address->timeout
4728 GNUNET_TIME_relative_to_absolute
4729 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4730 schedule_next_ping (peer_address);
4732 /* update traffic received amount ... */
4733 msize = ntohs (message->size);
4734 GNUNET_STATISTICS_update (stats,
4735 gettext_noop ("# bytes received from other peers"),
4738 n->distance = distance;
4740 GNUNET_TIME_relative_to_absolute
4741 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4742 GNUNET_SCHEDULER_cancel (n->timeout_task);
4744 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4745 &neighbour_timeout_task, n);
4746 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4748 /* dropping message due to frequent inbound volume violations! */
4749 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4750 GNUNET_ERROR_TYPE_BULK,
4752 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4753 n->in_tracker.available_bytes_per_s__,
4754 n->quota_violation_count);
4755 GNUNET_STATISTICS_update (stats,
4756 gettext_noop ("# bandwidth quota violations by other peers"),
4759 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4764 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
4765 ntohs (message->type),
4766 ntohs (message->size),
4769 switch (ntohs (message->type))
4771 case GNUNET_MESSAGE_TYPE_HELLO:
4772 GNUNET_STATISTICS_update (stats,
4773 gettext_noop ("# HELLO messages received from other peers"),
4776 process_hello (plugin, message);
4778 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4779 handle_ping (plugin, message, peer, session, sender_address, sender_address_len);
4781 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4782 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4785 ats = GNUNET_malloc(2 * sizeof(struct GNUNET_TRANSPORT_ATS_Information));
4786 ats[0].type = htonl(GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY);
4787 if (n->latency.rel_value <= UINT32_MAX)
4788 ats[0].value = htonl((uint32_t) n->latency.rel_value);
4790 ats[0].value = htonl(UINT32_MAX);
4791 ats[1].type = htonl(GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
4792 ats[1].value = htonl(n->distance);
4793 //handle_payload_message (message, n, NULL, 0);
4794 handle_payload_message (message, n, ats, 2);
4799 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4800 if (ret.rel_value > 0)
4802 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4803 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4804 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4805 (unsigned int) n->in_tracker.available_bytes_per_s__,
4806 (unsigned long long) ret.rel_value);
4807 GNUNET_STATISTICS_update (stats,
4808 gettext_noop ("# ms throttling suggested"),
4809 (int64_t) ret.rel_value,
4816 * Handle START-message. This is the first message sent to us
4817 * by any client which causes us to add it to our list.
4819 * @param cls closure (always NULL)
4820 * @param client identification of the client
4821 * @param message the actual message
4824 handle_start (void *cls,
4825 struct GNUNET_SERVER_Client *client,
4826 const struct GNUNET_MessageHeader *message)
4828 const struct StartMessage *start;
4829 struct TransportClient *c;
4830 struct ConnectInfoMessage cim;
4831 struct NeighbourList *n;
4833 start = (const struct StartMessage*) message;
4835 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4836 "Received `%s' request from client\n", "START");
4841 if (c->client == client)
4843 /* client already on our list! */
4845 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4850 if ( (GNUNET_NO != ntohl (start->do_check)) &&
4851 (0 != memcmp (&start->self,
4853 sizeof (struct GNUNET_PeerIdentity))) )
4855 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4856 _("Rejecting control connection from peer `%s', which is not me!\n"),
4857 GNUNET_i2s (&start->self));
4858 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4861 c = GNUNET_malloc (sizeof (struct TransportClient));
4865 if (our_hello != NULL)
4868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4869 "Sending our own `%s' to new client\n", "HELLO");
4871 transmit_to_client (c,
4872 (const struct GNUNET_MessageHeader *) our_hello,
4874 /* tell new client about all existing connections */
4875 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
4876 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4877 cim.ats_count = htonl(0);
4878 cim.ats.type = htonl(0);
4879 cim.ats.value = htonl(0);
4883 if (GNUNET_YES == n->received_pong)
4886 cim.latency = GNUNET_TIME_relative_hton (n->latency);
4887 cim.distance = htonl (n->distance);
4888 transmit_to_client (c, &cim.header, GNUNET_NO);
4893 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4898 * Handle HELLO-message.
4900 * @param cls closure (always NULL)
4901 * @param client identification of the client
4902 * @param message the actual message
4905 handle_hello (void *cls,
4906 struct GNUNET_SERVER_Client *client,
4907 const struct GNUNET_MessageHeader *message)
4911 GNUNET_STATISTICS_update (stats,
4912 gettext_noop ("# HELLOs received from clients"),
4915 ret = process_hello (NULL, message);
4916 GNUNET_SERVER_receive_done (client, ret);
4921 * Closure for 'transmit_client_message'; followed by
4922 * 'msize' bytes of the actual message.
4924 struct TransmitClientMessageContext
4927 * Client on whom's behalf we are sending.
4929 struct GNUNET_SERVER_Client *client;
4932 * Timeout for the transmission.
4934 struct GNUNET_TIME_Absolute timeout;
4942 * Size of the message in bytes.
4949 * Schedule transmission of a message we got from a client to a peer.
4951 * @param cls the 'struct TransmitClientMessageContext*'
4952 * @param n destination, or NULL on error (in that case, drop the message)
4955 transmit_client_message (void *cls,
4956 struct NeighbourList *n)
4958 struct TransmitClientMessageContext *tcmc = cls;
4959 struct TransportClient *tc;
4962 while ((tc != NULL) && (tc->client != tcmc->client))
4967 transmit_to_peer (tc, NULL, tcmc->priority,
4968 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
4970 tcmc->msize, GNUNET_NO, n);
4972 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
4973 GNUNET_SERVER_client_drop (tcmc->client);
4979 * Handle SEND-message.
4981 * @param cls closure (always NULL)
4982 * @param client identification of the client
4983 * @param message the actual message
4986 handle_send (void *cls,
4987 struct GNUNET_SERVER_Client *client,
4988 const struct GNUNET_MessageHeader *message)
4990 const struct OutboundMessage *obm;
4991 const struct GNUNET_MessageHeader *obmm;
4992 struct TransmitClientMessageContext *tcmc;
4996 size = ntohs (message->size);
4998 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
5001 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5004 GNUNET_STATISTICS_update (stats,
5005 gettext_noop ("# payload received for other peers"),
5008 obm = (const struct OutboundMessage *) message;
5009 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
5010 msize = size - sizeof (struct OutboundMessage);
5012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5013 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
5014 "SEND", GNUNET_i2s (&obm->peer),
5018 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
5019 tcmc->client = client;
5020 tcmc->priority = ntohl (obm->priority);
5021 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
5022 tcmc->msize = msize;
5023 /* FIXME: this memcpy can be up to 7% of our total runtime */
5024 memcpy (&tcmc[1], obmm, msize);
5025 GNUNET_SERVER_client_keep (client);
5026 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
5027 &transmit_client_message,
5033 * Handle request connect message
5035 * @param cls closure (always NULL)
5036 * @param client identification of the client
5037 * @param message the actual message
5040 handle_request_connect (void *cls,
5041 struct GNUNET_SERVER_Client *client,
5042 const struct GNUNET_MessageHeader *message)
5044 const struct TransportRequestConnectMessage *trcm =
5045 (const struct TransportRequestConnectMessage *) message;
5047 GNUNET_STATISTICS_update (stats,
5048 gettext_noop ("# REQUEST CONNECT messages received"),
5051 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received a request connect message for peer %s\n", GNUNET_i2s(&trcm->peer));
5052 setup_peer_check_blacklist (&trcm->peer, GNUNET_YES,
5054 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5058 * Handle SET_QUOTA-message.
5060 * @param cls closure (always NULL)
5061 * @param client identification of the client
5062 * @param message the actual message
5065 handle_set_quota (void *cls,
5066 struct GNUNET_SERVER_Client *client,
5067 const struct GNUNET_MessageHeader *message)
5069 const struct QuotaSetMessage *qsm =
5070 (const struct QuotaSetMessage *) message;
5071 struct NeighbourList *n;
5073 GNUNET_STATISTICS_update (stats,
5074 gettext_noop ("# SET QUOTA messages received"),
5077 n = find_neighbour (&qsm->peer);
5080 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5081 GNUNET_STATISTICS_update (stats,
5082 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
5088 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5089 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
5091 (unsigned int) ntohl (qsm->quota.value__),
5092 (unsigned int) n->in_tracker.available_bytes_per_s__,
5093 GNUNET_i2s (&qsm->peer));
5095 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
5097 if (0 == ntohl (qsm->quota.value__))
5099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5100 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&n->id),
5102 disconnect_neighbour (n, GNUNET_NO);
5104 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5109 * Take the given address and append it to the set of results sent back to
5112 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
5113 * @param address the resolved name, NULL to indicate the last response
5116 transmit_address_to_client (void *cls, const char *address)
5118 struct GNUNET_SERVER_TransmitContext *tc = cls;
5121 if (NULL == address)
5124 slen = strlen (address) + 1;
5126 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
5127 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5128 if (NULL == address)
5129 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
5134 * Handle AddressLookup-message.
5136 * @param cls closure (always NULL)
5137 * @param client identification of the client
5138 * @param message the actual message
5141 handle_address_lookup (void *cls,
5142 struct GNUNET_SERVER_Client *client,
5143 const struct GNUNET_MessageHeader *message)
5145 const struct AddressLookupMessage *alum;
5146 struct TransportPlugin *lsPlugin;
5147 const char *nameTransport;
5148 const char *address;
5150 struct GNUNET_SERVER_TransmitContext *tc;
5151 struct GNUNET_TIME_Absolute timeout;
5152 struct GNUNET_TIME_Relative rtimeout;
5155 size = ntohs (message->size);
5156 if (size < sizeof (struct AddressLookupMessage))
5158 GNUNET_break_op (0);
5159 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5162 alum = (const struct AddressLookupMessage *) message;
5163 uint32_t addressLen = ntohl (alum->addrlen);
5164 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
5166 GNUNET_break_op (0);
5167 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5170 address = (const char *) &alum[1];
5171 nameTransport = (const char *) &address[addressLen];
5173 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
5175 GNUNET_break_op (0);
5176 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5179 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
5180 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
5181 numeric = ntohl (alum->numeric_only);
5182 lsPlugin = find_transport (nameTransport);
5183 if (NULL == lsPlugin)
5185 tc = GNUNET_SERVER_transmit_context_create (client);
5186 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
5187 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5188 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
5191 tc = GNUNET_SERVER_transmit_context_create (client);
5192 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
5194 address, addressLen,
5197 &transmit_address_to_client, tc);
5202 * Setup the environment for this plugin.
5205 create_environment (struct TransportPlugin *plug)
5207 plug->env.cfg = cfg;
5208 plug->env.my_identity = &my_identity;
5209 plug->env.our_hello = &our_hello;
5210 plug->env.cls = plug;
5211 plug->env.receive = &plugin_env_receive;
5212 plug->env.notify_address = &plugin_env_notify_address;
5213 plug->env.session_end = &plugin_env_session_end;
5214 plug->env.max_connections = max_connect_per_transport;
5215 plug->env.stats = stats;
5220 * Start the specified transport (load the plugin).
5223 start_transport (struct GNUNET_SERVER_Handle *server,
5226 struct TransportPlugin *plug;
5229 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5230 _("Loading `%s' transport plugin\n"), name);
5231 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
5232 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
5233 create_environment (plug);
5234 plug->short_name = GNUNET_strdup (name);
5235 plug->lib_name = libname;
5236 plug->next = plugins;
5238 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
5239 if (plug->api == NULL)
5241 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5242 _("Failed to load transport plugin for `%s'\n"), name);
5243 GNUNET_free (plug->short_name);
5244 plugins = plug->next;
5245 GNUNET_free (libname);
5252 * Called whenever a client is disconnected. Frees our
5253 * resources associated with that client.
5255 * @param cls closure
5256 * @param client identification of the client
5259 client_disconnect_notification (void *cls,
5260 struct GNUNET_SERVER_Client *client)
5262 struct TransportClient *pos;
5263 struct TransportClient *prev;
5264 struct ClientMessageQueueEntry *mqe;
5265 struct Blacklisters *bl;
5266 struct BlacklistCheck *bc;
5271 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
5272 "Client disconnected, cleaning up.\n");
5274 /* clean up blacklister */
5278 if (bl->client == client)
5283 if (bc->bl_pos == bl)
5285 bc->bl_pos = bl->next;
5288 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
5291 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
5292 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
5298 GNUNET_CONTAINER_DLL_remove (bl_head,
5301 GNUNET_SERVER_client_drop (bl->client);
5307 /* clean up 'normal' clients */
5310 while ((pos != NULL) && (pos->client != client))
5317 while (NULL != (mqe = pos->message_queue_head))
5319 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
5320 pos->message_queue_tail,
5322 pos->message_count--;
5326 clients = pos->next;
5328 prev->next = pos->next;
5329 if (GNUNET_YES == pos->tcs_pending)
5334 if (pos->th != NULL)
5336 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
5339 GNUNET_break (0 == pos->message_count);
5345 * Function called when the service shuts down. Unloads our plugins
5346 * and cancels pending validations.
5348 * @param cls closure, unused
5349 * @param tc task context (unused)
5352 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5354 struct TransportPlugin *plug;
5355 struct OwnAddressList *al;
5356 struct CheckHelloValidatedContext *chvc;
5358 while (neighbours != NULL)
5360 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5361 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&neighbours->id),
5363 disconnect_neighbour (neighbours, GNUNET_NO);
5366 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5367 "Transport service is unloading plugins...\n");
5369 while (NULL != (plug = plugins))
5371 plugins = plug->next;
5372 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
5374 GNUNET_SCHEDULER_cancel (plug->address_update_task);
5375 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
5377 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
5378 GNUNET_free (plug->lib_name);
5379 GNUNET_free (plug->short_name);
5380 while (NULL != (al = plug->addresses))
5382 plug->addresses = al->next;
5387 if (my_private_key != NULL)
5388 GNUNET_CRYPTO_rsa_key_free (my_private_key);
5389 GNUNET_free_non_null (our_hello);
5391 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
5394 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5395 validation_map = NULL;
5397 /* free 'chvc' data structure */
5398 while (NULL != (chvc = chvc_head))
5400 chvc_head = chvc->next;
5401 if (chvc->piter != NULL)
5403 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
5404 GNUNET_STATISTICS_update (stats,
5405 gettext_noop ("# outstanding peerinfo iterate requests"),
5411 GNUNET_assert (chvc->ve_count == 0);
5418 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5421 if (peerinfo != NULL)
5423 GNUNET_PEERINFO_disconnect (peerinfo);
5426 /* Can we assume those are gone by now, or do we need to clean up
5428 GNUNET_break (bl_head == NULL);
5429 GNUNET_break (bc_head == NULL);
5434 * Initiate transport service.
5436 * @param cls closure
5437 * @param server the initialized server
5438 * @param c configuration to use
5442 struct GNUNET_SERVER_Handle *server,
5443 const struct GNUNET_CONFIGURATION_Handle *c)
5445 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
5446 {&handle_start, NULL,
5447 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
5448 {&handle_hello, NULL,
5449 GNUNET_MESSAGE_TYPE_HELLO, 0},
5450 {&handle_send, NULL,
5451 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
5452 {&handle_request_connect, NULL,
5453 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT, sizeof(struct TransportRequestConnectMessage)},
5454 {&handle_set_quota, NULL,
5455 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
5456 {&handle_address_lookup, NULL,
5457 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
5459 {&handle_blacklist_init, NULL,
5460 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
5461 {&handle_blacklist_reply, NULL,
5462 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
5468 unsigned long long tneigh;
5472 stats = GNUNET_STATISTICS_create ("transport", cfg);
5473 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
5474 /* parse configuration */
5476 GNUNET_CONFIGURATION_get_value_number (c,
5481 GNUNET_CONFIGURATION_get_value_filename (c,
5483 "HOSTKEY", &keyfile)))
5485 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5487 ("Transport service is lacking key configuration settings. Exiting.\n"));
5488 GNUNET_SCHEDULER_shutdown ();
5491 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5494 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5495 validation_map = NULL;
5498 max_connect_per_transport = (uint32_t) tneigh;
5499 peerinfo = GNUNET_PEERINFO_connect (cfg);
5500 if (peerinfo == NULL)
5502 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5503 _("Could not access PEERINFO service. Exiting.\n"));
5504 GNUNET_SCHEDULER_shutdown ();
5507 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5510 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5511 validation_map = NULL;
5512 GNUNET_free (keyfile);
5515 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
5516 GNUNET_free (keyfile);
5517 if (my_private_key == NULL)
5519 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5521 ("Transport service could not access hostkey. Exiting.\n"));
5522 GNUNET_SCHEDULER_shutdown ();
5525 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5528 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5529 validation_map = NULL;
5532 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
5533 GNUNET_CRYPTO_hash (&my_public_key,
5534 sizeof (my_public_key), &my_identity.hashPubKey);
5535 /* setup notification */
5536 GNUNET_SERVER_disconnect_notify (server,
5537 &client_disconnect_notification, NULL);
5538 /* load plugins... */
5541 GNUNET_CONFIGURATION_get_value_string (c,
5542 "TRANSPORT", "PLUGINS", &plugs))
5544 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5545 _("Starting transport plugins `%s'\n"), plugs);
5546 pos = strtok (plugs, " ");
5549 start_transport (server, pos);
5551 pos = strtok (NULL, " ");
5553 GNUNET_free (plugs);
5555 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
5556 &shutdown_task, NULL);
5561 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
5563 /* If we have a blacklist file, read from it */
5564 read_blacklist_file(cfg);
5565 /* process client requests */
5566 GNUNET_SERVER_add_handlers (server, handlers);
5571 * The main function for the transport service.
5573 * @param argc number of arguments from the command line
5574 * @param argv command line arguments
5575 * @return 0 ok, 1 on error
5578 main (int argc, char *const *argv)
5580 a2s (NULL, NULL, 0); /* make compiler happy */
5581 return (GNUNET_OK ==
5582 GNUNET_SERVICE_run (argc,
5585 GNUNET_SERVICE_OPTION_NONE,
5586 &run, NULL)) ? 0 : 1;
5589 /* end of gnunet-service-transport.c */