2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file transport/gnunet-service-transport.c
23 * @brief low-level P2P messaging
24 * @author Christian Grothoff
28 #include "gnunet_client_lib.h"
29 #include "gnunet_container_lib.h"
30 #include "gnunet_constants.h"
31 #include "gnunet_getopt_lib.h"
32 #include "gnunet_hello_lib.h"
33 #include "gnunet_os_lib.h"
34 #include "gnunet_peerinfo_service.h"
35 #include "gnunet_plugin_lib.h"
36 #include "gnunet_protocols.h"
37 #include "gnunet_service_lib.h"
38 #include "gnunet_signatures.h"
39 #include "plugin_transport.h"
40 #include "transport.h"
42 #define DEBUG_BLACKLIST GNUNET_NO
44 #define DEBUG_PING_PONG GNUNET_NO
46 #define SIGN_USELESS GNUNET_NO
48 #define DEBUG_TRANSPORT_HELLO GNUNET_YES
51 * Should we do some additional checks (to validate behavior
54 #define EXTRA_CHECKS GNUNET_YES
57 * How many messages can we have pending for a given client process
58 * before we start to drop incoming messages? We typically should
59 * have only one client and so this would be the primary buffer for
60 * messages, so the number should be chosen rather generously.
62 * The expectation here is that most of the time the queue is large
63 * enough so that a drop is virtually never required. Note that
64 * this value must be about as large as 'TOTAL_MSGS' in the
65 * 'test_transport_api_reliability.c', otherwise that testcase may
68 #define MAX_PENDING (128 * 1024)
71 * Size of the per-transport blacklist hash maps.
73 #define TRANSPORT_BLACKLIST_HT_SIZE 16
76 * How often should we try to reconnect to a peer using a particular
77 * transport plugin before giving up? Note that the plugin may be
78 * added back to the list after PLUGIN_RETRY_FREQUENCY expires.
80 #define MAX_CONNECT_RETRY 3
83 * Limit on the number of ready-to-run tasks when validating
84 * HELLOs. If more tasks are ready to run, we will drop
85 * HELLOs instead of validating them.
87 #define MAX_HELLO_LOAD 4
90 * How often must a peer violate bandwidth quotas before we start
91 * to simply drop its messages?
93 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
96 * How long until a HELLO verification attempt should time out?
97 * Must be rather small, otherwise a partially successful HELLO
98 * validation (some addresses working) might not be available
99 * before a client's request for a connection fails for good.
100 * Besides, if a single request to an address takes a long time,
101 * then the peer is unlikely worthwhile anyway.
103 #define HELLO_VERIFICATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
106 * How long is a PONG signature valid? We'll recycle a signature until
107 * 1/4 of this time is remaining. PONGs should expire so that if our
108 * external addresses change an adversary cannot replay them indefinitely.
109 * OTOH, we don't want to spend too much time generating PONG signatures,
110 * so they must have some lifetime to reduce our CPU usage.
112 #define PONG_SIGNATURE_LIFETIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
115 * Priority to use for PONG messages.
117 #define TRANSPORT_PONG_PRIORITY 4
120 * How often do we re-add (cheaper) plugins to our list of plugins
121 * to try for a given connected peer?
123 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
126 * After how long do we expire an address in a HELLO that we just
127 * validated? This value is also used for our own addresses when we
130 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
134 * How long before an existing address expires should we again try to
135 * validate it? Must be (significantly) smaller than
136 * HELLO_ADDRESS_EXPIRATION.
138 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
141 * Maximum frequency for re-evaluating latencies for all transport addresses.
143 #define LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
146 * Maximum frequency for re-evaluating latencies for connected addresses.
148 #define CONNECTED_LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 1)
152 * List of addresses of other peers
154 struct ForeignAddressList
157 * This is a linked list.
159 struct ForeignAddressList *next;
162 * Which ready list does this entry belong to.
164 struct ReadyList *ready_list;
167 * How long until we auto-expire this address (unless it is
168 * re-confirmed by the transport)?
170 struct GNUNET_TIME_Absolute expires;
173 * Task used to re-validate addresses, updates latencies and
176 GNUNET_SCHEDULER_TaskIdentifier revalidate_task;
184 * Session (or NULL if no valid session currently exists or if the
185 * plugin does not use sessions).
187 struct Session *session;
190 * What was the last latency observed for this address, plugin and peer?
192 struct GNUNET_TIME_Relative latency;
195 * If we did not successfully transmit a message to the given peer
196 * via this connection during the specified time, we should consider
197 * the connection to be dead. This is used in the case that a TCP
198 * transport simply stalls writing to the stream but does not
199 * formerly get a signal that the other peer died.
201 struct GNUNET_TIME_Absolute timeout;
204 * How often have we tried to connect using this plugin? Used to
205 * discriminate against addresses that do not work well.
206 * FIXME: not yet used, but should be!
208 unsigned int connect_attempts;
211 * DV distance to this peer (1 if no DV is used).
212 * FIXME: need to set this from transport plugins!
222 * Have we ever estimated the latency of this address? Used to
223 * ensure that the first time we add an address, we immediately
229 * Are we currently connected via this address? The first time we
230 * successfully transmit or receive data to a peer via a particular
231 * address, we set this to GNUNET_YES. If we later get an error
232 * (disconnect notification, transmission failure, timeout), we set
233 * it back to GNUNET_NO.
238 * Is this plugin currently busy transmitting to the specific target?
239 * GNUNET_NO if not (initial, default state is GNUNET_NO). Internal
240 * messages do not count as 'in transmit'.
245 * Has this address been validated yet?
253 * Entry in linked list of network addresses for ourselves. Also
254 * includes a cached signature for 'struct TransportPongMessage's.
256 struct OwnAddressList
259 * This is a linked list.
261 struct OwnAddressList *next;
264 * How long until we actually auto-expire this address (unless it is
265 * re-confirmed by the transport)?
267 struct GNUNET_TIME_Absolute expires;
270 * How long until the current signature expires? (ZERO if the
271 * signature was never created).
273 struct GNUNET_TIME_Absolute pong_sig_expires;
276 * Signature for a 'struct TransportPongMessage' for this address.
278 struct GNUNET_CRYPTO_RsaSignature pong_signature;
289 * Entry in linked list of all of our plugins.
291 struct TransportPlugin
295 * This is a linked list.
297 struct TransportPlugin *next;
300 * API of the transport as returned by the plugin's
301 * initialization function.
303 struct GNUNET_TRANSPORT_PluginFunctions *api;
306 * Short name for the plugin (i.e. "tcp").
311 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
316 * List of our known addresses for this transport.
318 struct OwnAddressList *addresses;
321 * Environment this transport service is using
324 struct GNUNET_TRANSPORT_PluginEnvironment env;
327 * ID of task that is used to clean up expired addresses.
329 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
332 * Set to GNUNET_YES if we need to scrap the existing list of
333 * "addresses" and start fresh when we receive the next address
334 * update from a transport. Set to GNUNET_NO if we should just add
335 * the new address to the list and wait for the commit call.
340 * Hashmap of blacklisted peers for this particular transport.
342 struct GNUNET_CONTAINER_MultiHashMap *blacklist;
345 struct NeighbourList;
348 * For each neighbour we keep a list of messages
349 * that we still want to transmit to the neighbour.
355 * This is a doubly linked list.
357 struct MessageQueue *next;
360 * This is a doubly linked list.
362 struct MessageQueue *prev;
365 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
366 * stuck together in memory. Allocated at the end of this struct.
368 const char *message_buf;
371 * Size of the message buf
373 size_t message_buf_size;
376 * Client responsible for queueing the message;
377 * used to check that a client has no two messages
378 * pending for the same target. Can be NULL.
380 struct TransportClient *client;
383 * Using which specific address should we send this message?
385 struct ForeignAddressList *specific_address;
388 * Peer ID of the Neighbour this entry belongs to.
390 struct GNUNET_PeerIdentity neighbour_id;
393 * Plugin that we used for the transmission.
394 * NULL until we scheduled a transmission.
396 struct TransportPlugin *plugin;
399 * At what time should we fail?
401 struct GNUNET_TIME_Absolute timeout;
404 * Internal message of the transport system that should not be
405 * included in the usual SEND-SEND_OK transmission confirmation
406 * traffic management scheme. Typically, "internal_msg" will
407 * be set whenever "client" is NULL (but it is not strictly
413 * How important is the message?
415 unsigned int priority;
421 * For a given Neighbour, which plugins are available
422 * to talk to this peer and what are their costs?
427 * This is a linked list.
429 struct ReadyList *next;
432 * Which of our transport plugins does this entry
435 struct TransportPlugin *plugin;
438 * Transport addresses, latency, and readiness for
439 * this particular plugin.
441 struct ForeignAddressList *addresses;
444 * To which neighbour does this ready list belong to?
446 struct NeighbourList *neighbour;
452 * Entry in linked list of all of our current neighbours.
458 * This is a linked list.
460 struct NeighbourList *next;
463 * Which of our transports is connected to this peer
464 * and what is their status?
466 struct ReadyList *plugins;
469 * Head of list of messages we would like to send to this peer;
470 * must contain at most one message per client.
472 struct MessageQueue *messages_head;
475 * Tail of list of messages we would like to send to this peer; must
476 * contain at most one message per client.
478 struct MessageQueue *messages_tail;
481 * Buffer for at most one payload message used when we receive
482 * payload data before our PING-PONG has succeeded. We then
483 * store such messages in this intermediary buffer until the
484 * connection is fully up.
486 struct GNUNET_MessageHeader *pre_connect_message_buffer;
489 * Context for peerinfo iteration.
490 * NULL after we are done processing peerinfo's information.
492 struct GNUNET_PEERINFO_IteratorContext *piter;
495 * Public key for this peer. Valid only if the respective flag is set below.
497 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
500 * Identity of this neighbour.
502 struct GNUNET_PeerIdentity id;
505 * ID of task scheduled to run when this peer is about to
506 * time out (will free resources associated with the peer).
508 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
511 * ID of task scheduled to run when we should retry transmitting
512 * the head of the message queue. Actually triggered when the
513 * transmission is timing out (we trigger instantly when we have
514 * a chance of success).
516 GNUNET_SCHEDULER_TaskIdentifier retry_task;
519 * How long until we should consider this peer dead
520 * (if we don't receive another message in the
523 struct GNUNET_TIME_Absolute peer_timeout;
526 * Tracker for inbound bandwidth.
528 struct GNUNET_BANDWIDTH_Tracker in_tracker;
531 * The latency we have seen for this particular address for
532 * this particular peer. This latency may have been calculated
533 * over multiple transports. This value reflects how long it took
534 * us to receive a response when SENDING via this particular
535 * transport/neighbour/address combination!
537 * FIXME: we need to periodically send PINGs to update this
538 * latency (at least more often than the current "huge" (11h?)
541 struct GNUNET_TIME_Relative latency;
544 * How often has the other peer (recently) violated the
545 * inbound traffic limit? Incremented by 10 per violation,
546 * decremented by 1 per non-violation (for each
549 unsigned int quota_violation_count;
552 * DV distance to this peer (1 if no DV is used).
557 * Have we seen an PONG from this neighbour in the past (and
558 * not had a disconnect since)?
563 * Do we have a valid public key for this neighbour?
565 int public_key_valid;
570 * Message used to ask a peer to validate receipt (to check an address
571 * from a HELLO). Followed by the address we are trying to validate,
572 * or an empty address if we are just sending a PING to confirm that a
573 * connection which the receiver (of the PING) initiated is still valid.
575 struct TransportPingMessage
579 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
581 struct GNUNET_MessageHeader header;
584 * Challenge code (to ensure fresh reply).
586 uint32_t challenge GNUNET_PACKED;
589 * Who is the intended recipient?
591 struct GNUNET_PeerIdentity target;
597 * Message used to validate a HELLO. The challenge is included in the
598 * confirmation to make matching of replies to requests possible. The
599 * signature signs our public key, an expiration time and our address.<p>
601 * This message is followed by our transport address that the PING tried
602 * to confirm (if we liked it). The address can be empty (zero bytes)
603 * if the PING had not address either (and we received the request via
604 * a connection that we initiated).
606 struct TransportPongMessage
610 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
612 struct GNUNET_MessageHeader header;
615 * Challenge code from PING (showing freshness). Not part of what
616 * is signed so that we can re-use signatures.
618 uint32_t challenge GNUNET_PACKED;
623 struct GNUNET_CRYPTO_RsaSignature signature;
626 * What are we signing and why? Two possible reason codes can be here:
627 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
628 * plausible address for this peer (pid is set to identity of signer); or
629 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING to confirm that this is
630 * an address we used to connect to the peer with the given pid.
632 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
635 * When does this signature expire?
637 struct GNUNET_TIME_AbsoluteNBO expiration;
640 * Either the identity of the peer Who signed this message, or the
641 * identity of the peer that we're connected to using the given
642 * address (depending on purpose.type).
644 struct GNUNET_PeerIdentity pid;
647 * Size of address appended to this message (part of what is
648 * being signed, hence not redundant).
656 * Linked list of messages to be transmitted to the client. Each
657 * entry is followed by the actual message.
659 struct ClientMessageQueueEntry
662 * This is a doubly-linked list.
664 struct ClientMessageQueueEntry *next;
667 * This is a doubly-linked list.
669 struct ClientMessageQueueEntry *prev;
674 * Client connected to the transport service.
676 struct TransportClient
680 * This is a linked list.
682 struct TransportClient *next;
685 * Handle to the client.
687 struct GNUNET_SERVER_Client *client;
690 * Linked list of messages yet to be transmitted to
693 struct ClientMessageQueueEntry *message_queue_head;
696 * Tail of linked list of messages yet to be transmitted to the
699 struct ClientMessageQueueEntry *message_queue_tail;
702 * Current transmit request handle.
704 struct GNUNET_CONNECTION_TransmitHandle *th;
707 * Is a call to "transmit_send_continuation" pending? If so, we
708 * must not free this struct (even if the corresponding client
709 * disconnects) and instead only remove it from the linked list and
710 * set the "client" field to NULL.
715 * Length of the list of messages pending for this client.
717 unsigned int message_count;
723 * Context of currently active requests to peerinfo
724 * for validation of HELLOs.
726 struct CheckHelloValidatedContext;
730 * Entry in map of all HELLOs awaiting validation.
732 struct ValidationEntry
736 * NULL if this entry is not part of a larger HELLO validation.
738 struct CheckHelloValidatedContext *chvc;
741 * The address, actually a pointer to the end
742 * of this struct. Do not free!
747 * Name of the transport.
749 char *transport_name;
752 * The public key of the peer.
754 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
757 * ID of task that will clean up this entry if we don't succeed
758 * with the validation first.
760 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
763 * At what time did we send this validation?
765 struct GNUNET_TIME_Absolute send_time;
768 * Session being validated (or NULL for none).
770 struct Session *session;
773 * Challenge number we used.
786 * Context of currently active requests to peerinfo
787 * for validation of HELLOs.
789 struct CheckHelloValidatedContext
793 * This is a doubly-linked list.
795 struct CheckHelloValidatedContext *next;
798 * This is a doubly-linked list.
800 struct CheckHelloValidatedContext *prev;
803 * Hello that we are validating.
805 const struct GNUNET_HELLO_Message *hello;
808 * Context for peerinfo iteration.
809 * NULL after we are done processing peerinfo's information.
811 struct GNUNET_PEERINFO_IteratorContext *piter;
814 * Was a HELLO known for this peer to peerinfo?
819 * Number of validation entries currently referring to this
822 unsigned int ve_count;
830 static struct GNUNET_HELLO_Message *our_hello;
835 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
840 static struct GNUNET_PeerIdentity my_identity;
845 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
850 struct GNUNET_SCHEDULER_Handle *sched;
855 const struct GNUNET_CONFIGURATION_Handle *cfg;
858 * Linked list of all clients to this service.
860 static struct TransportClient *clients;
863 * All loaded plugins.
865 static struct TransportPlugin *plugins;
868 * Handle to peerinfo service.
870 static struct GNUNET_PEERINFO_Handle *peerinfo;
873 * All known neighbours and their HELLOs.
875 static struct NeighbourList *neighbours;
878 * Number of neighbours we'd like to have.
880 static uint32_t max_connect_per_transport;
883 * Head of linked list.
885 static struct CheckHelloValidatedContext *chvc_head;
888 * Tail of linked list.
890 static struct CheckHelloValidatedContext *chvc_tail;
893 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
894 * of the given peer that we are currently validating).
896 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
899 * Handle for reporting statistics.
901 static struct GNUNET_STATISTICS_Handle *stats;
904 * The peer specified by the given neighbour has timed-out or a plugin
905 * has disconnected. We may either need to do nothing (other plugins
906 * still up), or trigger a full disconnect and clean up. This
907 * function updates our state and do the necessary notifications.
908 * Also notifies our clients that the neighbour is now officially
911 * @param n the neighbour list entry for the peer
912 * @param check should we just check if all plugins
913 * disconnected or must we ask all plugins to
916 static void disconnect_neighbour (struct NeighbourList *n, int check);
919 * Check the ready list for the given neighbour and if a plugin is
920 * ready for transmission (and if we have a message), do so!
922 * @param neighbour target peer for which to transmit
924 static void try_transmission_to_peer (struct NeighbourList *neighbour);
928 * Find an entry in the neighbour list for a particular peer.
930 * @return NULL if not found.
932 static struct NeighbourList *
933 find_neighbour (const struct GNUNET_PeerIdentity *key)
935 struct NeighbourList *head = neighbours;
937 while ((head != NULL) &&
938 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
945 * Find an entry in the transport list for a particular transport.
947 * @return NULL if not found.
949 static struct TransportPlugin *
950 find_transport (const char *short_name)
952 struct TransportPlugin *head = plugins;
953 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
959 * Is a particular peer blacklisted for a particular transport?
961 * @param peer the peer to check for
962 * @param plugin the plugin used to connect to the peer
964 * @return GNUNET_YES if the peer is blacklisted, GNUNET_NO if not
967 is_blacklisted (const struct GNUNET_PeerIdentity *peer, struct TransportPlugin *plugin)
970 if (plugin->blacklist != NULL)
972 if (GNUNET_CONTAINER_multihashmap_contains(plugin->blacklist, &peer->hashPubKey) == GNUNET_YES)
975 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
976 _("Peer `%s:%s' is blacklisted!\n"),
977 plugin->short_name, GNUNET_i2s (peer));
988 add_peer_to_blacklist (struct GNUNET_PeerIdentity *peer, char *transport_name)
990 struct TransportPlugin *plugin;
992 plugin = find_transport(transport_name);
993 if (plugin == NULL) /* Nothing to do */
995 if (plugin->blacklist == NULL)
996 plugin->blacklist = GNUNET_CONTAINER_multihashmap_create(TRANSPORT_BLACKLIST_HT_SIZE);
997 GNUNET_assert(plugin->blacklist != NULL);
998 GNUNET_CONTAINER_multihashmap_put(plugin->blacklist, &peer->hashPubKey,
1000 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
1005 * Read the blacklist file, containing transport:peer entries.
1006 * Provided the transport is loaded, set up hashmap with these
1007 * entries to blacklist peers by transport.
1011 read_blacklist_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
1018 struct GNUNET_PeerIdentity pid;
1020 struct GNUNET_CRYPTO_HashAsciiEncoded enc;
1021 unsigned int entries_found;
1022 char *transport_name;
1025 GNUNET_CONFIGURATION_get_value_filename (cfg,
1031 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1032 _("Option `%s' in section `%s' not specified!\n"),
1038 if (GNUNET_OK != GNUNET_DISK_file_test (fn))
1039 GNUNET_DISK_fn_write (fn, NULL, 0, GNUNET_DISK_PERM_USER_READ
1040 | GNUNET_DISK_PERM_USER_WRITE);
1041 if (0 != STAT (fn, &frstat))
1043 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1044 _("Could not read blacklist file `%s'\n"), fn);
1048 if (frstat.st_size == 0)
1051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1052 _("Blacklist file `%s' is empty.\n"),
1058 /* FIXME: use mmap */
1059 data = GNUNET_malloc_large (frstat.st_size);
1060 GNUNET_assert(data != NULL);
1061 if (frstat.st_size !=
1062 GNUNET_DISK_fn_read (fn, data, frstat.st_size))
1064 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1065 _("Failed to read blacklist from `%s'\n"), fn);
1072 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1074 while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
1075 (pos <= frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
1078 while ((colon_pos < frstat.st_size) && (data[colon_pos] != ':') && !isspace ( (unsigned char) data[colon_pos]))
1081 if (colon_pos >= frstat.st_size)
1083 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1084 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1085 (unsigned long long) colon_pos);
1091 if (isspace( (unsigned char) data[colon_pos]))
1093 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1094 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1095 (unsigned long long) colon_pos);
1097 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1101 tsize = colon_pos - pos;
1102 if ((pos >= frstat.st_size) || (pos + tsize >= frstat.st_size) || (tsize == 0))
1104 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1105 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1106 (unsigned long long) colon_pos);
1112 transport_name = GNUNET_malloc(tsize + 1);
1113 memcpy(transport_name, &data[pos], tsize);
1114 pos = colon_pos + 1;
1116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1117 _("Read transport name %s in blacklist file.\n"),
1120 memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
1121 if (!isspace ( (unsigned char) enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
1123 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1124 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1125 (unsigned long long) pos);
1127 while ((pos < frstat.st_size) && (!isspace ( (unsigned char) data[pos])))
1129 GNUNET_free_non_null(transport_name);
1132 enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
1133 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
1135 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1136 _("Syntax error in blacklist file at offset %llu, skipping bytes `%s'.\n"),
1137 (unsigned long long) pos,
1142 if (0 != memcmp (&pid,
1144 sizeof (struct GNUNET_PeerIdentity)))
1147 add_peer_to_blacklist (&pid,
1152 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1153 _("Found myself `%s' in blacklist (useless, ignored)\n"),
1157 pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
1158 GNUNET_free_non_null(transport_name);
1159 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1168 * Function called to notify a client about the socket being ready to
1169 * queue more data. "buf" will be NULL and "size" zero if the socket
1170 * was closed for writing in the meantime.
1172 * @param cls closure
1173 * @param size number of bytes available in buf
1174 * @param buf where the callee should write the message
1175 * @return number of bytes written to buf
1178 transmit_to_client_callback (void *cls, size_t size, void *buf)
1180 struct TransportClient *client = cls;
1181 struct ClientMessageQueueEntry *q;
1184 const struct GNUNET_MessageHeader *msg;
1190 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1191 "Transmission to client failed, closing connection.\n");
1192 /* fatal error with client, free message queue! */
1193 while (NULL != (q = client->message_queue_head))
1195 GNUNET_STATISTICS_update (stats,
1196 gettext_noop ("# bytes discarded (could not transmit to client)"),
1197 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
1199 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1200 client->message_queue_tail,
1204 client->message_count = 0;
1209 while (NULL != (q = client->message_queue_head))
1211 msg = (const struct GNUNET_MessageHeader *) &q[1];
1212 msize = ntohs (msg->size);
1213 if (msize + tsize > size)
1216 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1217 "Transmitting message of type %u to client.\n",
1220 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1221 client->message_queue_tail,
1223 memcpy (&cbuf[tsize], msg, msize);
1226 client->message_count--;
1230 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1231 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1233 GNUNET_TIME_UNIT_FOREVER_REL,
1234 &transmit_to_client_callback,
1236 GNUNET_assert (client->th != NULL);
1243 * Convert an address to a string.
1245 * @param plugin name of the plugin responsible for the address
1246 * @param addr binary address
1247 * @param addr_len number of bytes in addr
1248 * @return NULL on error, otherwise address string
1251 a2s (const char *plugin,
1255 struct TransportPlugin *p;
1259 p = find_transport (plugin);
1262 return p->api->address_to_string (p->api->cls,
1269 * Mark the given FAL entry as 'connected' (and hence preferred for
1270 * sending); also mark all others for the same peer as 'not connected'
1271 * (since only one can be preferred).
1273 * @param fal address to set to 'connected'
1276 mark_address_connected (struct ForeignAddressList *fal)
1278 struct ForeignAddressList *pos;
1281 GNUNET_assert (GNUNET_YES == fal->validated);
1282 if (fal->connected == GNUNET_YES)
1283 return; /* nothing to do */
1285 pos = fal->ready_list->addresses;
1288 if (GNUNET_YES == pos->connected)
1291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1292 "Marking address `%s' as no longer connected (due to connect on other address)\n",
1293 a2s (pos->ready_list->plugin->short_name,
1297 GNUNET_break (cnt == GNUNET_YES);
1299 pos->connected = GNUNET_NO;
1300 GNUNET_STATISTICS_update (stats,
1301 gettext_noop ("# connected addresses"),
1307 fal->connected = GNUNET_YES;
1308 if (GNUNET_YES == cnt)
1310 GNUNET_STATISTICS_update (stats,
1311 gettext_noop ("# connected addresses"),
1319 * Send the specified message to the specified client. Since multiple
1320 * messages may be pending for the same client at a time, this code
1321 * makes sure that no message is lost.
1323 * @param client client to transmit the message to
1324 * @param msg the message to send
1325 * @param may_drop can this message be dropped if the
1326 * message queue for this client is getting far too large?
1329 transmit_to_client (struct TransportClient *client,
1330 const struct GNUNET_MessageHeader *msg, int may_drop)
1332 struct ClientMessageQueueEntry *q;
1335 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
1337 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1339 ("Dropping message of type %u and size %u, have %u messages pending (%u is the soft limit)\n"),
1342 client->message_count,
1344 GNUNET_STATISTICS_update (stats,
1345 gettext_noop ("# messages dropped due to slow client"),
1350 msize = ntohs (msg->size);
1351 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1352 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1353 memcpy (&q[1], msg, msize);
1354 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1355 client->message_queue_tail,
1356 client->message_queue_tail,
1358 client->message_count++;
1359 if (client->th == NULL)
1361 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1363 GNUNET_TIME_UNIT_FOREVER_REL,
1364 &transmit_to_client_callback,
1366 GNUNET_assert (client->th != NULL);
1372 * Transmit a 'SEND_OK' notification to the given client for the
1375 * @param client who to notify
1376 * @param n neighbour to notify about
1377 * @param result status code for the transmission request
1380 transmit_send_ok (struct TransportClient *client,
1381 struct NeighbourList *n,
1384 struct SendOkMessage send_ok_msg;
1386 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1387 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1388 send_ok_msg.success = htonl (result);
1389 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1390 send_ok_msg.peer = n->id;
1391 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1396 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1397 * upon "completion" of a send request. This tells the API
1398 * that it is now legal to send another message to the given
1401 * @param cls closure, identifies the entry on the
1402 * message queue that was transmitted and the
1403 * client responsible for queueing the message
1404 * @param target the peer receiving the message
1405 * @param result GNUNET_OK on success, if the transmission
1406 * failed, we should not tell the client to transmit
1410 transmit_send_continuation (void *cls,
1411 const struct GNUNET_PeerIdentity *target,
1414 struct MessageQueue *mq = cls;
1415 struct NeighbourList *n;
1417 GNUNET_STATISTICS_update (stats,
1418 gettext_noop ("# bytes pending with plugins"),
1419 - (int64_t) mq->message_buf_size,
1421 if (result == GNUNET_OK)
1423 GNUNET_STATISTICS_update (stats,
1424 gettext_noop ("# bytes successfully transmitted by plugins"),
1425 mq->message_buf_size,
1430 GNUNET_STATISTICS_update (stats,
1431 gettext_noop ("# bytes with transmission failure by plugins"),
1432 mq->message_buf_size,
1435 n = find_neighbour(&mq->neighbour_id);
1436 GNUNET_assert (n != NULL);
1437 if (mq->specific_address != NULL)
1439 if (result == GNUNET_OK)
1441 mq->specific_address->timeout =
1442 GNUNET_TIME_relative_to_absolute
1443 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1444 if (mq->specific_address->validated == GNUNET_YES)
1445 mark_address_connected (mq->specific_address);
1449 if (mq->specific_address->connected != GNUNET_NO)
1452 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1453 "Marking address `%s' as no longer connected (due to transmission problem)\n",
1454 a2s (mq->specific_address->ready_list->plugin->short_name,
1455 mq->specific_address->addr,
1456 mq->specific_address->addrlen));
1458 GNUNET_STATISTICS_update (stats,
1459 gettext_noop ("# connected addresses"),
1462 mq->specific_address->connected = GNUNET_NO;
1465 if (! mq->internal_msg)
1466 mq->specific_address->in_transmit = GNUNET_NO;
1468 if (mq->client != NULL)
1469 transmit_send_ok (mq->client, n, result);
1471 try_transmission_to_peer (n);
1476 * Find an address in any of the available transports for
1477 * the given neighbour that would be good for message
1478 * transmission. This is essentially the transport selection
1481 * @param neighbour for whom to select an address
1482 * @return selected address, NULL if we have none
1484 struct ForeignAddressList *
1485 find_ready_address(struct NeighbourList *neighbour)
1487 struct ReadyList *head = neighbour->plugins;
1488 struct ForeignAddressList *addresses;
1489 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1490 struct ForeignAddressList *best_address;
1492 best_address = NULL;
1493 while (head != NULL)
1495 addresses = head->addresses;
1496 while (addresses != NULL)
1498 if ( (addresses->timeout.value < now.value) &&
1499 (addresses->connected == GNUNET_YES) )
1502 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1503 "Marking long-time inactive connection to `%4s' as down.\n",
1504 GNUNET_i2s (&neighbour->id));
1506 GNUNET_STATISTICS_update (stats,
1507 gettext_noop ("# connected addresses"),
1510 addresses->connected = GNUNET_NO;
1512 addresses = addresses->next;
1515 addresses = head->addresses;
1516 while (addresses != NULL)
1518 #if DEBUG_TRANSPORT > 1
1519 if (addresses->addr != NULL)
1520 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1521 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1522 a2s (head->plugin->short_name,
1524 addresses->addrlen),
1525 GNUNET_i2s (&neighbour->id),
1526 addresses->connected,
1527 addresses->in_transmit,
1528 addresses->validated,
1529 addresses->connect_attempts,
1530 (unsigned long long) addresses->timeout.value,
1531 (unsigned int) addresses->distance);
1533 if ( ( (best_address == NULL) ||
1534 (addresses->connected == GNUNET_YES) ||
1535 (best_address->connected == GNUNET_NO) ) &&
1536 (addresses->in_transmit == GNUNET_NO) &&
1537 ( (best_address == NULL) ||
1538 (addresses->latency.value < best_address->latency.value)) )
1539 best_address = addresses;
1540 /* FIXME: also give lower-latency addresses that are not
1541 connected a chance some times... */
1542 addresses = addresses->next;
1546 if (best_address != NULL)
1549 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1550 "Best address found (`%s') has latency of %llu ms.\n",
1551 (best_address->addrlen > 0)
1552 ? a2s (best_address->ready_list->plugin->short_name,
1554 best_address->addrlen)
1556 best_address->latency.value);
1561 GNUNET_STATISTICS_update (stats,
1562 gettext_noop ("# transmission attempts failed (no address)"),
1566 return best_address;
1572 * We should re-try transmitting to the given peer,
1573 * hopefully we've learned something in the meantime.
1576 retry_transmission_task (void *cls,
1577 const struct GNUNET_SCHEDULER_TaskContext *tc)
1579 struct NeighbourList *n = cls;
1581 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1582 try_transmission_to_peer (n);
1587 * Check the ready list for the given neighbour and if a plugin is
1588 * ready for transmission (and if we have a message), do so!
1590 * @param neighbour target peer for which to transmit
1593 try_transmission_to_peer (struct NeighbourList *neighbour)
1595 struct ReadyList *rl;
1596 struct MessageQueue *mq;
1597 struct GNUNET_TIME_Relative timeout;
1601 if (neighbour->messages_head == NULL)
1604 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1605 "Transmission queue for `%4s' is empty\n",
1606 GNUNET_i2s (&neighbour->id));
1608 return; /* nothing to do */
1611 mq = neighbour->messages_head;
1612 force_address = GNUNET_YES;
1613 if (mq->specific_address == NULL)
1615 mq->specific_address = find_ready_address(neighbour);
1616 GNUNET_STATISTICS_update (stats,
1617 gettext_noop ("# transport selected peer address freely"),
1620 force_address = GNUNET_NO;
1622 if (mq->specific_address == NULL)
1624 GNUNET_STATISTICS_update (stats,
1625 gettext_noop ("# transport failed to selected peer address"),
1628 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1629 if (timeout.value == 0)
1632 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1633 "No destination address available to transmit message of size %u to peer `%4s'\n",
1634 mq->message_buf_size,
1635 GNUNET_i2s (&mq->neighbour_id));
1637 GNUNET_STATISTICS_update (stats,
1638 gettext_noop ("# bytes in message queue for other peers"),
1639 - (int64_t) mq->message_buf_size,
1641 GNUNET_STATISTICS_update (stats,
1642 gettext_noop ("# bytes discarded (no destination address available)"),
1643 mq->message_buf_size,
1645 if (mq->client != NULL)
1646 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1647 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1648 neighbour->messages_tail,
1651 return; /* nobody ready */
1653 GNUNET_STATISTICS_update (stats,
1654 gettext_noop ("# message delivery deferred (no address)"),
1657 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1658 GNUNET_SCHEDULER_cancel (sched,
1659 neighbour->retry_task);
1660 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (sched,
1662 &retry_transmission_task,
1665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1666 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1667 mq->message_buf_size,
1668 GNUNET_i2s (&mq->neighbour_id),
1671 /* FIXME: might want to trigger peerinfo lookup here
1672 (unless that's already pending...) */
1675 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1676 neighbour->messages_tail,
1678 if (mq->specific_address->connected == GNUNET_NO)
1679 mq->specific_address->connect_attempts++;
1680 rl = mq->specific_address->ready_list;
1681 mq->plugin = rl->plugin;
1682 if (!mq->internal_msg)
1683 mq->specific_address->in_transmit = GNUNET_YES;
1685 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1686 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1687 mq->message_buf_size,
1688 GNUNET_i2s (&neighbour->id),
1689 (mq->specific_address->addr != NULL)
1690 ? a2s (mq->plugin->short_name,
1691 mq->specific_address->addr,
1692 mq->specific_address->addrlen)
1694 rl->plugin->short_name);
1696 GNUNET_STATISTICS_update (stats,
1697 gettext_noop ("# bytes in message queue for other peers"),
1698 - (int64_t) mq->message_buf_size,
1700 GNUNET_STATISTICS_update (stats,
1701 gettext_noop ("# bytes pending with plugins"),
1702 mq->message_buf_size,
1704 ret = rl->plugin->api->send (rl->plugin->api->cls,
1707 mq->message_buf_size,
1709 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1710 mq->specific_address->session,
1711 mq->specific_address->addr,
1712 mq->specific_address->addrlen,
1714 &transmit_send_continuation, mq);
1717 /* failure, but 'send' would not call continuation in this case,
1718 so we need to do it here! */
1719 transmit_send_continuation (mq,
1727 * Send the specified message to the specified peer.
1729 * @param client source of the transmission request (can be NULL)
1730 * @param peer_address ForeignAddressList where we should send this message
1731 * @param priority how important is the message
1732 * @param timeout how long do we have to transmit?
1733 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1734 * @param message_buf_size total size of all messages in message_buf
1735 * @param is_internal is this an internal message; these are pre-pended and
1736 * also do not count for plugins being "ready" to transmit
1737 * @param neighbour handle to the neighbour for transmission
1740 transmit_to_peer (struct TransportClient *client,
1741 struct ForeignAddressList *peer_address,
1742 unsigned int priority,
1743 struct GNUNET_TIME_Relative timeout,
1744 const char *message_buf,
1745 size_t message_buf_size,
1746 int is_internal, struct NeighbourList *neighbour)
1748 struct MessageQueue *mq;
1753 /* check for duplicate submission */
1754 mq = neighbour->messages_head;
1757 if (mq->client == client)
1759 /* client transmitted to same peer twice
1760 before getting SEND_OK! */
1768 GNUNET_STATISTICS_update (stats,
1769 gettext_noop ("# bytes in message queue for other peers"),
1772 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1773 mq->specific_address = peer_address;
1774 mq->client = client;
1775 memcpy (&mq[1], message_buf, message_buf_size);
1776 mq->message_buf = (const char*) &mq[1];
1777 mq->message_buf_size = message_buf_size;
1778 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1779 mq->internal_msg = is_internal;
1780 mq->priority = priority;
1781 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1783 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1784 neighbour->messages_tail,
1787 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1788 neighbour->messages_tail,
1789 neighbour->messages_tail,
1791 try_transmission_to_peer (neighbour);
1798 struct GeneratorContext
1800 struct TransportPlugin *plug_pos;
1801 struct OwnAddressList *addr_pos;
1802 struct GNUNET_TIME_Absolute expiration;
1810 address_generator (void *cls, size_t max, void *buf)
1812 struct GeneratorContext *gc = cls;
1815 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1817 gc->plug_pos = gc->plug_pos->next;
1818 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1820 if (NULL == gc->plug_pos)
1825 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1828 gc->addr_pos->addrlen, buf, max);
1829 gc->addr_pos = gc->addr_pos->next;
1835 * Construct our HELLO message from all of the addresses of
1836 * all of the transports.
1841 struct GNUNET_HELLO_Message *hello;
1842 struct TransportClient *cpos;
1843 struct NeighbourList *npos;
1844 struct GeneratorContext gc;
1846 gc.plug_pos = plugins;
1847 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1848 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1849 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1852 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1854 GNUNET_STATISTICS_update (stats,
1855 gettext_noop ("# refreshed my HELLO"),
1859 while (cpos != NULL)
1861 transmit_to_client (cpos,
1862 (const struct GNUNET_MessageHeader *) hello,
1867 GNUNET_free_non_null (our_hello);
1869 GNUNET_PEERINFO_add_peer (peerinfo, our_hello);
1871 while (npos != NULL)
1874 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1875 "Transmitting updated `%s' to neighbour `%4s'\n",
1876 "HELLO", GNUNET_i2s (&npos->id));
1878 GNUNET_STATISTICS_update (stats,
1879 gettext_noop ("# transmitted my HELLO to other peers"),
1882 transmit_to_peer (NULL, NULL, 0,
1883 HELLO_ADDRESS_EXPIRATION,
1884 (const char *) our_hello,
1885 GNUNET_HELLO_size(our_hello),
1893 * Task used to clean up expired addresses for a plugin.
1895 * @param cls closure
1899 expire_address_task (void *cls,
1900 const struct GNUNET_SCHEDULER_TaskContext *tc);
1904 * Update the list of addresses for this plugin,
1905 * expiring those that are past their expiration date.
1907 * @param plugin addresses of which plugin should be recomputed?
1908 * @param fresh set to GNUNET_YES if a new address was added
1909 * and we need to regenerate the HELLO even if nobody
1913 update_addresses (struct TransportPlugin *plugin, int fresh)
1915 static struct GNUNET_TIME_Absolute last_update;
1916 struct GNUNET_TIME_Relative min_remaining;
1917 struct GNUNET_TIME_Relative remaining;
1918 struct GNUNET_TIME_Absolute now;
1919 struct OwnAddressList *pos;
1920 struct OwnAddressList *prev;
1921 struct OwnAddressList *next;
1924 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1925 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1926 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1927 now = GNUNET_TIME_absolute_get ();
1928 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1929 expired = (GNUNET_TIME_absolute_get_duration (last_update).value > (HELLO_ADDRESS_EXPIRATION.value / 4));
1931 pos = plugin->addresses;
1935 if (pos->expires.value < now.value)
1937 expired = GNUNET_YES;
1939 plugin->addresses = pos->next;
1941 prev->next = pos->next;
1946 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1947 if (remaining.value < min_remaining.value)
1948 min_remaining = remaining;
1954 if (expired || fresh)
1959 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1960 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1962 plugin->address_update_task
1963 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1965 &expire_address_task, plugin);
1970 * Task used to clean up expired addresses for a plugin.
1972 * @param cls closure
1976 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1978 struct TransportPlugin *plugin = cls;
1980 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1981 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1982 update_addresses (plugin, GNUNET_NO);
1987 * Iterator over hash map entries that NULLs the session of validation
1988 * entries that match the given session.
1990 * @param cls closure (the 'struct Session*' to match against)
1991 * @param key current key code (peer ID, not used)
1992 * @param value value in the hash map ('struct ValidationEntry*')
1993 * @return GNUNET_YES (we should continue to iterate)
1996 remove_session_validations (void *cls,
1997 const GNUNET_HashCode * key,
2000 struct Session *session = cls;
2001 struct ValidationEntry *ve = value;
2003 if (session == ve->session)
2010 * Function that will be called whenever the plugin internally
2011 * cleans up a session pointer and hence the service needs to
2012 * discard all of those sessions as well. Plugins that do not
2013 * use sessions can simply omit calling this function and always
2014 * use NULL wherever a session pointer is needed.
2016 * @param cls closure
2017 * @param peer which peer was the session for
2018 * @param session which session is being destoyed
2021 plugin_env_session_end (void *cls,
2022 const struct GNUNET_PeerIdentity *peer,
2023 struct Session *session)
2025 struct TransportPlugin *p = cls;
2026 struct NeighbourList *nl;
2027 struct ReadyList *rl;
2028 struct ForeignAddressList *pos;
2029 struct ForeignAddressList *prev;
2031 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2032 &remove_session_validations,
2034 nl = find_neighbour (peer);
2040 if (rl->plugin == p)
2047 pos = rl->addresses;
2048 while ( (pos != NULL) &&
2049 (pos->session != session) )
2056 pos->session = NULL;
2057 if (pos->addrlen != 0)
2060 rl->addresses = pos->next;
2062 prev->next = pos->next;
2063 if (GNUNET_SCHEDULER_NO_TASK != pos->revalidate_task)
2065 GNUNET_SCHEDULER_cancel (sched,
2066 pos->revalidate_task);
2067 pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2070 if (nl->received_pong == GNUNET_NO)
2071 return; /* nothing to do */
2072 /* check if we have any validated addresses left */
2073 pos = rl->addresses;
2080 /* no valid addresses left, signal disconnect! */
2081 disconnect_neighbour (nl, GNUNET_NO);
2086 * Function that must be called by each plugin to notify the
2087 * transport service about the addresses under which the transport
2088 * provided by the plugin can be reached.
2090 * @param cls closure
2091 * @param name name of the transport that generated the address
2092 * @param addr one of the addresses of the host, NULL for the last address
2093 * the specific address format depends on the transport
2094 * @param addrlen length of the address
2095 * @param expires when should this address automatically expire?
2098 plugin_env_notify_address (void *cls,
2102 struct GNUNET_TIME_Relative expires)
2104 struct TransportPlugin *p = cls;
2105 struct OwnAddressList *al;
2106 struct GNUNET_TIME_Absolute abex;
2108 GNUNET_assert (addr != NULL);
2109 abex = GNUNET_TIME_relative_to_absolute (expires);
2110 GNUNET_assert (p == find_transport (name));
2114 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
2116 if (al->expires.value < abex.value)
2123 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
2124 al->next = p->addresses;
2127 al->addrlen = addrlen;
2128 memcpy (&al[1], addr, addrlen);
2129 update_addresses (p, GNUNET_YES);
2134 * Notify all of our clients about a peer connecting.
2137 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
2138 struct GNUNET_TIME_Relative latency,
2141 struct ConnectInfoMessage cim;
2142 struct TransportClient *cpos;
2145 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2146 "Notifying clients about connection from `%s'\n",
2149 GNUNET_STATISTICS_update (stats,
2150 gettext_noop ("# peers connected"),
2153 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2154 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2155 cim.distance = htonl (distance);
2156 cim.latency = GNUNET_TIME_relative_hton (latency);
2157 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
2159 while (cpos != NULL)
2161 transmit_to_client (cpos, &cim.header, GNUNET_NO);
2168 * Notify all of our clients about a peer disconnecting.
2171 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2173 struct DisconnectInfoMessage dim;
2174 struct TransportClient *cpos;
2177 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2178 "Notifying clients about lost connection to `%s'\n",
2181 GNUNET_STATISTICS_update (stats,
2182 gettext_noop ("# peers connected"),
2185 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2186 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2187 dim.reserved = htonl (0);
2188 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2190 while (cpos != NULL)
2192 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2199 * Find a ForeignAddressList entry for the given neighbour
2200 * that matches the given address and transport.
2202 * @param neighbour which peer we care about
2203 * @param tname name of the transport plugin
2204 * @param session session to look for, NULL for 'any'; otherwise
2205 * can be used for the service to "learn" this session ID
2207 * @param addr binary address
2208 * @param addrlen length of addr
2209 * @return NULL if no such entry exists
2211 static struct ForeignAddressList *
2212 find_peer_address(struct NeighbourList *neighbour,
2214 struct Session *session,
2218 struct ReadyList *head;
2219 struct ForeignAddressList *pos;
2221 head = neighbour->plugins;
2222 while (head != NULL)
2224 if (0 == strcmp (tname, head->plugin->short_name))
2230 pos = head->addresses;
2231 while ( (pos != NULL) &&
2232 ( (pos->addrlen != addrlen) ||
2233 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2235 if ( (session != NULL) &&
2236 (pos->session == session) )
2240 if ( (session != NULL) && (pos != NULL) )
2241 pos->session = session; /* learn it! */
2247 * Get the peer address struct for the given neighbour and
2248 * address. If it doesn't yet exist, create it.
2250 * @param neighbour which peer we care about
2251 * @param tname name of the transport plugin
2252 * @param session session of the plugin, or NULL for none
2253 * @param addr binary address
2254 * @param addrlen length of addr
2255 * @return NULL if we do not have a transport plugin for 'tname'
2257 static struct ForeignAddressList *
2258 add_peer_address (struct NeighbourList *neighbour,
2260 struct Session *session,
2264 struct ReadyList *head;
2265 struct ForeignAddressList *ret;
2267 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2270 head = neighbour->plugins;
2272 while (head != NULL)
2274 if (0 == strcmp (tname, head->plugin->short_name))
2280 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2281 ret->session = session;
2284 ret->addr = (const char*) &ret[1];
2285 memcpy (&ret[1], addr, addrlen);
2291 ret->addrlen = addrlen;
2292 ret->expires = GNUNET_TIME_relative_to_absolute
2293 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2294 ret->latency = GNUNET_TIME_relative_get_forever();
2296 ret->timeout = GNUNET_TIME_relative_to_absolute
2297 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2298 ret->ready_list = head;
2299 ret->next = head->addresses;
2300 head->addresses = ret;
2306 * Closure for 'add_validated_address'.
2308 struct AddValidatedAddressContext
2311 * Entry that has been validated.
2313 const struct ValidationEntry *ve;
2316 * Flag set after we have added the address so
2317 * that we terminate the iteration next time.
2324 * Callback function used to fill a buffer of max bytes with a list of
2325 * addresses in the format used by HELLOs. Should use
2326 * "GNUNET_HELLO_add_address" as a helper function.
2328 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2329 * @param max maximum number of bytes that can be written to buf
2330 * @param buf where to write the address information
2331 * @return number of bytes written, 0 to signal the
2332 * end of the iteration.
2335 add_validated_address (void *cls,
2336 size_t max, void *buf)
2338 struct AddValidatedAddressContext *avac = cls;
2339 const struct ValidationEntry *ve = avac->ve;
2341 if (GNUNET_YES == avac->done)
2343 avac->done = GNUNET_YES;
2344 return GNUNET_HELLO_add_address (ve->transport_name,
2345 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2355 * Closure for 'check_address_exists'.
2357 struct CheckAddressExistsClosure
2360 * Address to check for.
2365 * Name of the transport.
2372 struct Session *session;
2375 * Set to GNUNET_YES if the address exists.
2388 * Iterator over hash map entries. Checks if the given
2389 * validation entry is for the same address as what is given
2392 * @param cls the 'struct CheckAddressExistsClosure*'
2393 * @param key current key code (ignored)
2394 * @param value value in the hash map ('struct ValidationEntry')
2395 * @return GNUNET_YES if we should continue to
2396 * iterate (mismatch), GNUNET_NO if not (entry matched)
2399 check_address_exists (void *cls,
2400 const GNUNET_HashCode * key,
2403 struct CheckAddressExistsClosure *caec = cls;
2404 struct ValidationEntry *ve = value;
2406 if ( (0 == strcmp (caec->tname,
2407 ve->transport_name)) &&
2408 (caec->addrlen == ve->addrlen) &&
2409 (0 == memcmp (caec->addr,
2413 caec->exists = GNUNET_YES;
2416 if ( (ve->session != NULL) &&
2417 (caec->session == ve->session) )
2419 caec->exists = GNUNET_YES;
2428 * Iterator to free entries in the validation_map.
2430 * @param cls closure (unused)
2431 * @param key current key code
2432 * @param value value in the hash map (validation to abort)
2433 * @return GNUNET_YES (always)
2436 abort_validation (void *cls,
2437 const GNUNET_HashCode * key,
2440 struct ValidationEntry *va = value;
2442 if (GNUNET_SCHEDULER_NO_TASK != va->timeout_task)
2443 GNUNET_SCHEDULER_cancel (sched, va->timeout_task);
2444 GNUNET_free (va->transport_name);
2445 if (va->chvc != NULL)
2447 va->chvc->ve_count--;
2448 if (va->chvc->ve_count == 0)
2450 GNUNET_CONTAINER_DLL_remove (chvc_head,
2453 GNUNET_free (va->chvc);
2463 * HELLO validation cleanup task (validation failed).
2465 * @param cls the 'struct ValidationEntry' that failed
2466 * @param tc scheduler context (unused)
2469 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2471 struct ValidationEntry *va = cls;
2472 struct GNUNET_PeerIdentity pid;
2474 va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2475 GNUNET_STATISTICS_update (stats,
2476 gettext_noop ("# address validation timeouts"),
2479 GNUNET_CRYPTO_hash (&va->publicKey,
2481 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2483 GNUNET_break (GNUNET_OK ==
2484 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2487 abort_validation (NULL, NULL, va);
2492 neighbour_timeout_task (void *cls,
2493 const struct GNUNET_SCHEDULER_TaskContext *tc)
2495 struct NeighbourList *n = cls;
2498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2499 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2501 GNUNET_STATISTICS_update (stats,
2502 gettext_noop ("# disconnects due to timeout"),
2505 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2506 disconnect_neighbour (n, GNUNET_NO);
2511 * Schedule the job that will cause us to send a PING to the
2512 * foreign address to evaluate its validity and latency.
2514 * @param fal address to PING
2517 schedule_next_ping (struct ForeignAddressList *fal);
2521 * Add the given address to the list of foreign addresses
2522 * available for the given peer (check for duplicates).
2524 * @param cls the respective 'struct NeighbourList' to update
2525 * @param tname name of the transport
2526 * @param expiration expiration time
2527 * @param addr the address
2528 * @param addrlen length of the address
2529 * @return GNUNET_OK (always)
2532 add_to_foreign_address_list (void *cls,
2534 struct GNUNET_TIME_Absolute expiration,
2538 struct NeighbourList *n = cls;
2539 struct ForeignAddressList *fal;
2542 GNUNET_STATISTICS_update (stats,
2543 gettext_noop ("# valid peer addresses returned by PEERINFO"),
2547 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2552 "Adding address `%s' (%s) for peer `%4s' due to PEERINFO data for %llums.\n",
2553 a2s (tname, addr, addrlen),
2555 GNUNET_i2s (&n->id),
2558 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2561 GNUNET_STATISTICS_update (stats,
2562 gettext_noop ("# previously validated addresses lacking transport"),
2568 fal->expires = GNUNET_TIME_absolute_max (expiration,
2570 schedule_next_ping (fal);
2576 fal->expires = GNUNET_TIME_absolute_max (expiration,
2581 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2582 "Failed to add new address for `%4s'\n",
2583 GNUNET_i2s (&n->id));
2586 if (fal->validated == GNUNET_NO)
2588 fal->validated = GNUNET_YES;
2589 GNUNET_STATISTICS_update (stats,
2590 gettext_noop ("# peer addresses considered valid"),
2594 if (try == GNUNET_YES)
2596 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2597 "Have new addresses, will try to trigger transmissions.\n");
2598 try_transmission_to_peer (n);
2605 * Add addresses in validated HELLO "h" to the set of addresses
2606 * we have for this peer.
2608 * @param cls closure ('struct NeighbourList*')
2609 * @param peer id of the peer, NULL for last call
2610 * @param h hello message for the peer (can be NULL)
2611 * @param trust amount of trust we have in the peer (not used)
2614 add_hello_for_peer (void *cls,
2615 const struct GNUNET_PeerIdentity *peer,
2616 const struct GNUNET_HELLO_Message *h,
2619 struct NeighbourList *n = cls;
2627 return; /* no HELLO available */
2629 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2630 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2634 if (GNUNET_YES != n->public_key_valid)
2636 GNUNET_HELLO_get_key (h, &n->publicKey);
2637 n->public_key_valid = GNUNET_YES;
2639 GNUNET_HELLO_iterate_addresses (h,
2641 &add_to_foreign_address_list,
2647 * Create a fresh entry in our neighbour list for the given peer.
2648 * Will try to transmit our current HELLO to the new neighbour.
2649 * Do not call this function directly, use 'setup_peer_check_blacklist.
2651 * @param peer the peer for which we create the entry
2652 * @param do_hello should we schedule transmitting a HELLO
2653 * @return the new neighbour list entry
2655 static struct NeighbourList *
2656 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2659 struct NeighbourList *n;
2660 struct TransportPlugin *tp;
2661 struct ReadyList *rl;
2664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2665 "Setting up state for neighbour `%4s'\n",
2668 GNUNET_assert (our_hello != NULL);
2669 GNUNET_STATISTICS_update (stats,
2670 gettext_noop ("# active neighbours"),
2673 n = GNUNET_malloc (sizeof (struct NeighbourList));
2674 n->next = neighbours;
2678 GNUNET_TIME_relative_to_absolute
2679 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2680 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2681 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2682 MAX_BANDWIDTH_CARRY_S);
2686 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2688 rl = GNUNET_malloc (sizeof (struct ReadyList));
2690 rl->next = n->plugins;
2693 rl->addresses = NULL;
2697 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2699 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2700 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2701 &neighbour_timeout_task, n);
2704 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2705 0, GNUNET_TIME_UNIT_FOREVER_REL,
2706 &add_hello_for_peer, n);
2707 transmit_to_peer (NULL, NULL, 0,
2708 HELLO_ADDRESS_EXPIRATION,
2709 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2717 * Function called after we have checked if communicating
2718 * with a given peer is acceptable.
2720 * @param cls closure
2721 * @param n NULL if communication is not acceptable
2723 typedef void (*SetupContinuation)(void *cls,
2724 struct NeighbourList *n);
2728 * Information kept for each client registered to perform
2734 * This is a linked list.
2736 struct Blacklisters *next;
2739 * This is a linked list.
2741 struct Blacklisters *prev;
2744 * Client responsible for this entry.
2746 struct GNUNET_SERVER_Client *client;
2749 * Blacklist check that we're currently performing.
2751 struct BlacklistCheck *bc;
2757 * Head of DLL of blacklisting clients.
2759 static struct Blacklisters *bl_head;
2762 * Tail of DLL of blacklisting clients.
2764 static struct Blacklisters *bl_tail;
2768 * Context we use when performing a blacklist check.
2770 struct BlacklistCheck
2774 * This is a linked list.
2776 struct BlacklistCheck *next;
2779 * This is a linked list.
2781 struct BlacklistCheck *prev;
2784 * Peer being checked.
2786 struct GNUNET_PeerIdentity peer;
2789 * Option for setup neighbour afterwards.
2794 * Continuation to call with the result.
2796 SetupContinuation cont;
2804 * Current transmission request handle for this client, or NULL if no
2805 * request is pending.
2807 struct GNUNET_CONNECTION_TransmitHandle *th;
2810 * Our current position in the blacklisters list.
2812 struct Blacklisters *bl_pos;
2815 * Current task performing the check.
2817 GNUNET_SCHEDULER_TaskIdentifier task;
2822 * Head of DLL of active blacklisting queries.
2824 static struct BlacklistCheck *bc_head;
2827 * Tail of DLL of active blacklisting queries.
2829 static struct BlacklistCheck *bc_tail;
2833 * Perform next action in the blacklist check.
2835 * @param cls the 'struct BlacklistCheck*'
2839 do_blacklist_check (void *cls,
2840 const struct GNUNET_SCHEDULER_TaskContext *tc);
2844 * Transmit blacklist query to the client.
2846 * @param cls the 'struct BlacklistCheck'
2847 * @param size number of bytes allowed
2848 * @param buf where to copy the message
2849 * @return number of bytes copied to buf
2852 transmit_blacklist_message (void *cls,
2856 struct BlacklistCheck *bc = cls;
2857 struct Blacklisters *bl;
2858 struct BlacklistMessage bm;
2863 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2864 bc->task = GNUNET_SCHEDULER_add_now (sched,
2865 &do_blacklist_check,
2870 bm.header.size = htons (sizeof (struct BlacklistMessage));
2871 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2872 bm.is_allowed = htonl (0);
2874 memcpy (buf, &bm, sizeof (bm));
2875 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2881 * Perform next action in the blacklist check.
2883 * @param cls the 'struct BlacklistCheck*'
2887 do_blacklist_check (void *cls,
2888 const struct GNUNET_SCHEDULER_TaskContext *tc)
2890 struct BlacklistCheck *bc = cls;
2891 struct Blacklisters *bl;
2893 bc->task = GNUNET_SCHEDULER_NO_TASK;
2897 bc->cont (bc->cont_cls,
2898 setup_new_neighbour (&bc->peer, bc->do_hello));
2905 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
2906 sizeof (struct BlacklistMessage),
2907 GNUNET_TIME_UNIT_FOREVER_REL,
2908 &transmit_blacklist_message,
2915 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
2916 * does not yet exist, check the blacklist. If the blacklist says creating
2917 * one is acceptable, create one and call the continuation; otherwise
2918 * call the continuation with NULL.
2920 * @param peer peer to setup or look up a struct NeighbourList for
2921 * @param do_hello should we also schedule sending our HELLO to the peer
2922 * if this is a new record
2923 * @param cont function to call with the 'struct NeigbhbourList*'
2924 * @param cont_cls closure for cont
2927 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
2929 SetupContinuation cont,
2932 struct NeighbourList *n;
2933 struct BlacklistCheck *bc;
2935 n = find_neighbour(peer);
2941 if (bl_head == NULL)
2944 setup_new_neighbour (peer, do_hello));
2947 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
2948 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
2950 bc->do_hello = do_hello;
2952 bc->cont_cls = cont_cls;
2953 bc->bl_pos = bl_head;
2954 bc->task = GNUNET_SCHEDULER_add_now (sched,
2955 &do_blacklist_check,
2961 * Function called with the result of querying a new blacklister about
2962 * it being allowed (or not) to continue to talk to an existing neighbour.
2964 * @param cls the original 'struct NeighbourList'
2965 * @param n NULL if we need to disconnect
2968 confirm_or_drop_neighbour (void *cls,
2969 struct NeighbourList *n)
2971 struct NeighbourList * orig = cls;
2974 disconnect_neighbour (orig, GNUNET_NO);
2979 * Handle a request to start a blacklist.
2981 * @param cls closure (always NULL)
2982 * @param client identification of the client
2983 * @param message the actual message
2986 handle_blacklist_init (void *cls,
2987 struct GNUNET_SERVER_Client *client,
2988 const struct GNUNET_MessageHeader *message)
2990 struct Blacklisters *bl;
2991 struct BlacklistCheck *bc;
2992 struct NeighbourList *n;
2997 if (bl->client == client)
3000 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3005 bl = GNUNET_malloc (sizeof (struct Blacklisters));
3006 bl->client = client;
3007 GNUNET_SERVER_client_keep (client);
3008 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
3009 /* confirm that all existing connections are OK! */
3013 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3014 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3016 bc->do_hello = GNUNET_NO;
3017 bc->cont = &confirm_or_drop_neighbour;
3020 if (n == neighbours) /* all would wait for the same client, no need to
3021 create more than just the first task right now */
3022 bc->task = GNUNET_SCHEDULER_add_now (sched,
3023 &do_blacklist_check,
3031 * Handle a request to blacklist a peer.
3033 * @param cls closure (always NULL)
3034 * @param client identification of the client
3035 * @param message the actual message
3038 handle_blacklist_reply (void *cls,
3039 struct GNUNET_SERVER_Client *client,
3040 const struct GNUNET_MessageHeader *message)
3042 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
3043 struct Blacklisters *bl;
3044 struct BlacklistCheck *bc;
3047 while ( (bl != NULL) &&
3048 (bl->client != client) )
3052 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3057 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
3059 bc->cont (bc->cont_cls, NULL);
3060 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
3065 bc->bl_pos = bc->bl_pos->next;
3066 bc->task = GNUNET_SCHEDULER_add_now (sched,
3067 &do_blacklist_check,
3070 /* check if any other bc's are waiting for this blacklister */
3074 if ( (bc->bl_pos == bl) &&
3075 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
3076 bc->task = GNUNET_SCHEDULER_add_now (sched,
3077 &do_blacklist_check,
3085 * Send periodic PING messages to a given foreign address.
3087 * @param cls our 'struct PeriodicValidationContext*'
3088 * @param tc task context
3091 send_periodic_ping (void *cls,
3092 const struct GNUNET_SCHEDULER_TaskContext *tc)
3094 struct ForeignAddressList *peer_address = cls;
3095 struct TransportPlugin *tp;
3096 struct ValidationEntry *va;
3097 struct NeighbourList *neighbour;
3098 struct TransportPingMessage ping;
3099 struct CheckAddressExistsClosure caec;
3101 uint16_t hello_size;
3105 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3106 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3108 tp = peer_address->ready_list->plugin;
3109 neighbour = peer_address->ready_list->neighbour;
3110 if (GNUNET_YES != neighbour->public_key_valid)
3112 /* no public key yet, try again later */
3113 schedule_next_ping (peer_address);
3116 caec.addr = peer_address->addr;
3117 caec.addrlen = peer_address->addrlen;
3118 caec.tname = tp->short_name;
3119 caec.session = peer_address->session;
3120 caec.exists = GNUNET_NO;
3121 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3122 &check_address_exists,
3124 if (caec.exists == GNUNET_YES)
3126 /* During validation attempts we will likely trigger the other
3127 peer trying to validate our address which in turn will cause
3128 it to send us its HELLO, so we expect to hit this case rather
3129 frequently. Only print something if we are very verbose. */
3130 #if DEBUG_TRANSPORT > 1
3131 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3132 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3133 (peer_address->addr != NULL)
3134 ? a2s (tp->short_name,
3136 peer_address->addrlen)
3139 GNUNET_i2s (&neighbour->id));
3141 schedule_next_ping (peer_address);
3144 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3145 va->transport_name = GNUNET_strdup (tp->short_name);
3146 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3148 va->send_time = GNUNET_TIME_absolute_get();
3149 va->session = peer_address->session;
3150 if (peer_address->addr != NULL)
3152 va->addr = (const void*) &va[1];
3153 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3154 va->addrlen = peer_address->addrlen;
3156 memcpy(&va->publicKey,
3157 &neighbour->publicKey,
3158 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3160 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3161 HELLO_VERIFICATION_TIMEOUT,
3162 &timeout_hello_validation,
3164 GNUNET_CONTAINER_multihashmap_put (validation_map,
3165 &neighbour->id.hashPubKey,
3167 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3168 hello_size = GNUNET_HELLO_size(our_hello);
3169 tsize = sizeof(struct TransportPingMessage) + hello_size;
3170 if (peer_address->addr != NULL)
3172 slen = strlen (tp->short_name) + 1;
3173 tsize += slen + peer_address->addrlen;
3175 message_buf = GNUNET_malloc(tsize);
3176 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3177 ping.challenge = htonl(va->challenge);
3178 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3179 memcpy(message_buf, our_hello, hello_size);
3180 if (peer_address->addr != NULL)
3182 ping.header.size = htons(sizeof(struct TransportPingMessage) +
3183 peer_address->addrlen +
3185 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3188 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3190 peer_address->addrlen);
3194 ping.header.size = htons(sizeof(struct TransportPingMessage));
3196 memcpy(&message_buf[hello_size],
3198 sizeof(struct TransportPingMessage));
3200 #if DEBUG_TRANSPORT_REVALIDATION
3201 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3202 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s'\n",
3203 (peer_address->addr != NULL)
3204 ? a2s (peer_address->plugin->short_name,
3206 peer_address->addrlen)
3209 GNUNET_i2s (&neighbour->id),
3210 "HELLO", hello_size,
3213 GNUNET_STATISTICS_update (stats,
3214 gettext_noop ("# PING messages sent for re-validation"),
3217 transmit_to_peer (NULL, peer_address,
3218 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3219 HELLO_VERIFICATION_TIMEOUT,
3221 GNUNET_YES, neighbour);
3222 GNUNET_free(message_buf);
3223 schedule_next_ping (peer_address);
3228 * Schedule the job that will cause us to send a PING to the
3229 * foreign address to evaluate its validity and latency.
3231 * @param fal address to PING
3234 schedule_next_ping (struct ForeignAddressList *fal)
3236 struct GNUNET_TIME_Relative delay;
3238 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3240 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3241 delay.value /= 2; /* do before expiration */
3242 delay = GNUNET_TIME_relative_min (delay,
3243 LATENCY_EVALUATION_MAX_DELAY);
3244 if (GNUNET_YES != fal->estimated)
3246 delay = GNUNET_TIME_UNIT_ZERO;
3247 fal->estimated = GNUNET_YES;
3249 if (GNUNET_YES == fal->connected)
3251 delay = GNUNET_TIME_relative_min (delay,
3252 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3254 /* FIXME: also adjust delay based on how close the last
3255 observed latency is to the latency of the best alternative */
3256 /* bound how fast we can go */
3257 delay = GNUNET_TIME_relative_max (delay,
3258 GNUNET_TIME_UNIT_SECONDS);
3259 /* randomize a bit (to avoid doing all at the same time) */
3260 delay.value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3261 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(sched,
3263 &send_periodic_ping,
3271 * Function that will be called if we receive some payload
3272 * from another peer.
3274 * @param message the payload
3275 * @param n peer who claimed to be the sender
3278 handle_payload_message (const struct GNUNET_MessageHeader *message,
3279 struct NeighbourList *n)
3281 struct InboundMessage *im;
3282 struct TransportClient *cpos;
3285 msize = ntohs (message->size);
3286 if (n->received_pong == GNUNET_NO)
3288 GNUNET_free_non_null (n->pre_connect_message_buffer);
3289 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3290 memcpy (n->pre_connect_message_buffer, message, msize);
3294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3295 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
3296 ntohs (message->type),
3297 ntohs (message->size),
3298 GNUNET_i2s (&n->id));
3300 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3303 n->quota_violation_count++;
3305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3306 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3307 n->in_tracker.available_bytes_per_s__,
3308 n->quota_violation_count);
3310 /* Discount 32k per violation */
3311 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3316 if (n->quota_violation_count > 0)
3318 /* try to add 32k back */
3319 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3321 n->quota_violation_count--;
3324 GNUNET_STATISTICS_update (stats,
3325 gettext_noop ("# payload received from other peers"),
3328 /* transmit message to all clients */
3329 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3330 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3331 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3332 im->latency = GNUNET_TIME_relative_hton (n->latency);
3334 im->distance = ntohl(n->distance);
3335 memcpy (&im[1], message, msize);
3337 while (cpos != NULL)
3339 transmit_to_client (cpos, &im->header, GNUNET_YES);
3347 * Iterator over hash map entries. Checks if the given validation
3348 * entry is for the same challenge as what is given in the PONG.
3350 * @param cls the 'struct TransportPongMessage*'
3351 * @param key peer identity
3352 * @param value value in the hash map ('struct ValidationEntry')
3353 * @return GNUNET_YES if we should continue to
3354 * iterate (mismatch), GNUNET_NO if not (entry matched)
3357 check_pending_validation (void *cls,
3358 const GNUNET_HashCode * key,
3361 const struct TransportPongMessage *pong = cls;
3362 struct ValidationEntry *ve = value;
3363 struct AddValidatedAddressContext avac;
3364 unsigned int challenge = ntohl(pong->challenge);
3365 struct GNUNET_HELLO_Message *hello;
3366 struct GNUNET_PeerIdentity target;
3367 struct NeighbourList *n;
3368 struct ForeignAddressList *fal;
3369 struct OwnAddressList *oal;
3370 struct TransportPlugin *tp;
3371 struct GNUNET_MessageHeader *prem;
3377 ps = ntohs (pong->header.size);
3378 if (ps < sizeof (struct TransportPongMessage))
3380 GNUNET_break_op (0);
3383 addr = (const char*) &pong[1];
3384 slen = strlen (ve->transport_name) + 1;
3385 if ( (ps - sizeof (struct TransportPongMessage) != ve->addrlen + slen) ||
3386 (ve->challenge != challenge) ||
3387 (addr[slen-1] != '\0') ||
3388 (0 != strcmp (addr, ve->transport_name)) ||
3389 (ntohl (pong->purpose.size)
3390 != sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3392 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3393 sizeof (struct GNUNET_PeerIdentity) + ve->addrlen + slen) )
3395 alen = ps - sizeof (struct TransportPongMessage) - slen;
3396 switch (ntohl (pong->purpose.purpose))
3398 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN:
3399 if ( (ve->addrlen + slen != ntohl (pong->addrlen)) ||
3400 (0 != memcmp (&addr[slen],
3403 return GNUNET_YES; /* different entry, keep trying! */
3404 if (0 != memcmp (&pong->pid,
3406 sizeof (struct GNUNET_PeerIdentity)))
3408 GNUNET_break_op (0);
3412 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
3417 GNUNET_break_op (0);
3421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3422 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
3424 a2s (ve->transport_name,
3425 (const struct sockaddr *) ve->addr,
3427 ve->transport_name);
3430 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING:
3431 if (ve->addrlen != 0)
3432 return GNUNET_YES; /* different entry, keep trying */
3433 if ( (0 != memcmp (&pong->pid,
3435 sizeof (struct GNUNET_PeerIdentity))) ||
3436 (ve->addrlen != 0) )
3438 GNUNET_break_op (0);
3441 tp = find_transport (ve->transport_name);
3447 oal = tp->addresses;
3450 if ( (oal->addrlen == alen) &&
3451 (0 == memcmp (&oal[1],
3459 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3460 _("Not accepting PONG with address `%s' since I cannot confirm having this address.\n"),
3461 a2s (ve->transport_name,
3467 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING,
3472 GNUNET_break_op (0);
3476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3477 "Confirmed that peer `%4s' is talking to us using address `%s' (%s) for us.\n",
3479 a2s (ve->transport_name,
3482 ve->transport_name);
3486 GNUNET_break_op (0);
3489 if (GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (pong->expiration)).value == 0)
3491 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3492 _("Received expired signature. Check system time.\n"));
3495 GNUNET_STATISTICS_update (stats,
3496 gettext_noop ("# address validation successes"),
3499 /* create the updated HELLO */
3500 GNUNET_CRYPTO_hash (&ve->publicKey,
3501 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3502 &target.hashPubKey);
3503 if (ve->addr != NULL)
3505 avac.done = GNUNET_NO;
3507 hello = GNUNET_HELLO_create (&ve->publicKey,
3508 &add_validated_address,
3510 GNUNET_PEERINFO_add_peer (peerinfo,
3512 GNUNET_free (hello);
3514 n = find_neighbour (&target);
3517 n->publicKey = ve->publicKey;
3518 n->public_key_valid = GNUNET_YES;
3519 fal = add_peer_address (n,
3524 GNUNET_assert (fal != NULL);
3525 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
3526 fal->validated = GNUNET_YES;
3527 mark_address_connected (fal);
3528 GNUNET_STATISTICS_update (stats,
3529 gettext_noop ("# peer addresses considered valid"),
3532 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
3533 schedule_next_ping (fal);
3534 if (n->latency.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
3535 n->latency = fal->latency;
3537 n->latency.value = (fal->latency.value + n->latency.value) / 2;
3539 n->distance = fal->distance;
3540 if (GNUNET_NO == n->received_pong)
3542 n->received_pong = GNUNET_YES;
3543 notify_clients_connect (&target, n->latency, n->distance);
3544 if (NULL != (prem = n->pre_connect_message_buffer))
3546 n->pre_connect_message_buffer = NULL;
3547 handle_payload_message (prem, n);
3551 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3553 GNUNET_SCHEDULER_cancel (sched,
3555 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3556 try_transmission_to_peer (n);
3560 /* clean up validation entry */
3561 GNUNET_assert (GNUNET_YES ==
3562 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3565 abort_validation (NULL, NULL, ve);
3571 * Function that will be called if we receive a validation
3572 * of an address challenge that we transmitted to another
3573 * peer. Note that the validation should only be considered
3574 * acceptable if the challenge matches AND if the sender
3575 * address is at least a plausible address for this peer
3576 * (otherwise we may be seeing a MiM attack).
3578 * @param cls closure
3579 * @param message the pong message
3580 * @param peer who responded to our challenge
3581 * @param sender_address string describing our sender address (as observed
3582 * by the other peer in binary format)
3583 * @param sender_address_len number of bytes in 'sender_address'
3586 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3587 const struct GNUNET_PeerIdentity *peer,
3588 const char *sender_address,
3589 size_t sender_address_len)
3591 #if DEBUG_TRANSPORT > 1
3592 /* we get tons of these that just get discarded, only log
3593 if we are quite verbose */
3594 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3595 "Receiving `%s' message from `%4s'.\n", "PONG",
3598 GNUNET_STATISTICS_update (stats,
3599 gettext_noop ("# PONG messages received"),
3602 if (GNUNET_SYSERR !=
3603 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3605 &check_pending_validation,
3608 /* This is *expected* to happen a lot since we send
3609 PONGs to *all* known addresses of the sender of
3610 the PING, so most likely we get multiple PONGs
3611 per PING, and all but the first PONG will end up
3612 here. So really we should not print anything here
3613 unless we want to be very, very verbose... */
3614 #if DEBUG_TRANSPORT > 2
3615 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3616 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3628 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3630 * @param cls the 'struct ValidationEntry*'
3631 * @param neighbour neighbour to validate, NULL if validation failed
3634 transmit_hello_and_ping (void *cls,
3635 struct NeighbourList *neighbour)
3637 struct ValidationEntry *va = cls;
3638 struct ForeignAddressList *peer_address;
3639 struct TransportPingMessage ping;
3640 uint16_t hello_size;
3643 struct GNUNET_PeerIdentity id;
3646 GNUNET_CRYPTO_hash (&va->publicKey,
3647 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3649 if (neighbour == NULL)
3651 /* FIXME: stats... */
3652 GNUNET_break (GNUNET_OK ==
3653 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3656 abort_validation (NULL, NULL, va);
3659 neighbour->publicKey = va->publicKey;
3660 neighbour->public_key_valid = GNUNET_YES;
3661 peer_address = add_peer_address (neighbour,
3662 va->transport_name, NULL,
3663 (const void*) &va[1],
3665 if (peer_address == NULL)
3667 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3668 "Failed to add peer `%4s' for plugin `%s'\n",
3669 GNUNET_i2s (&neighbour->id),
3670 va->transport_name);
3671 GNUNET_break (GNUNET_OK ==
3672 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3675 abort_validation (NULL, NULL, va);
3678 hello_size = GNUNET_HELLO_size(our_hello);
3679 slen = strlen(va->transport_name) + 1;
3680 tsize = sizeof(struct TransportPingMessage) + hello_size + va->addrlen + slen;
3681 message_buf = GNUNET_malloc(tsize);
3682 ping.challenge = htonl(va->challenge);
3683 ping.header.size = htons(sizeof(struct TransportPingMessage) + slen + va->addrlen);
3684 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3685 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3686 memcpy(message_buf, our_hello, hello_size);
3687 memcpy(&message_buf[hello_size],
3689 sizeof(struct TransportPingMessage));
3690 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3693 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3697 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3698 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3701 : a2s (va->transport_name,
3702 (const void*) &va[1], va->addrlen),
3704 GNUNET_i2s (&neighbour->id),
3705 "HELLO", hello_size,
3706 "PING", sizeof (struct TransportPingMessage) + va->addrlen + slen);
3709 GNUNET_STATISTICS_update (stats,
3710 gettext_noop ("# PING messages sent for initial validation"),
3713 transmit_to_peer (NULL, peer_address,
3714 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3715 HELLO_VERIFICATION_TIMEOUT,
3717 GNUNET_YES, neighbour);
3718 GNUNET_free(message_buf);
3723 * Check if the given address is already being validated; if not,
3724 * append the given address to the list of entries that are being be
3725 * validated and initiate validation.
3727 * @param cls closure ('struct CheckHelloValidatedContext *')
3728 * @param tname name of the transport
3729 * @param expiration expiration time
3730 * @param addr the address
3731 * @param addrlen length of the address
3732 * @return GNUNET_OK (always)
3735 run_validation (void *cls,
3737 struct GNUNET_TIME_Absolute expiration,
3741 struct CheckHelloValidatedContext *chvc = cls;
3742 struct GNUNET_PeerIdentity id;
3743 struct TransportPlugin *tp;
3744 struct ValidationEntry *va;
3745 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3746 struct CheckAddressExistsClosure caec;
3747 struct OwnAddressList *oal;
3749 GNUNET_assert (addr != NULL);
3751 GNUNET_STATISTICS_update (stats,
3752 gettext_noop ("# peer addresses scheduled for validation"),
3755 tp = find_transport (tname);
3758 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3759 GNUNET_ERROR_TYPE_BULK,
3761 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3763 GNUNET_STATISTICS_update (stats,
3764 gettext_noop ("# peer addresses not validated (plugin not available)"),
3769 /* check if this is one of our own addresses */
3770 oal = tp->addresses;
3773 if ( (oal->addrlen == addrlen) &&
3774 (0 == memcmp (&oal[1],
3778 /* not plausible, this address is equivalent to our own address! */
3779 GNUNET_STATISTICS_update (stats,
3780 gettext_noop ("# peer addresses not validated (loopback)"),
3787 GNUNET_HELLO_get_key (chvc->hello, &pk);
3788 GNUNET_CRYPTO_hash (&pk,
3790 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3793 if (is_blacklisted(&id, tp))
3796 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3797 "Attempted to validate blacklisted peer `%s' using `%s'!\n",
3805 caec.addrlen = addrlen;
3806 caec.session = NULL;
3808 caec.exists = GNUNET_NO;
3809 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3810 &check_address_exists,
3812 if (caec.exists == GNUNET_YES)
3814 /* During validation attempts we will likely trigger the other
3815 peer trying to validate our address which in turn will cause
3816 it to send us its HELLO, so we expect to hit this case rather
3817 frequently. Only print something if we are very verbose. */
3818 #if DEBUG_TRANSPORT > 1
3819 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3820 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3821 a2s (tname, addr, addrlen),
3825 GNUNET_STATISTICS_update (stats,
3826 gettext_noop ("# peer addresses not validated (in progress)"),
3831 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
3834 va->transport_name = GNUNET_strdup (tname);
3835 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3837 va->send_time = GNUNET_TIME_absolute_get();
3838 va->addr = (const void*) &va[1];
3839 memcpy (&va[1], addr, addrlen);
3840 va->addrlen = addrlen;
3841 GNUNET_HELLO_get_key (chvc->hello,
3843 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3844 HELLO_VERIFICATION_TIMEOUT,
3845 &timeout_hello_validation,
3847 GNUNET_CONTAINER_multihashmap_put (validation_map,
3850 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3851 setup_peer_check_blacklist (&id, GNUNET_NO,
3852 &transmit_hello_and_ping,
3859 * Check if addresses in validated hello "h" overlap with
3860 * those in "chvc->hello" and validate the rest.
3862 * @param cls closure
3863 * @param peer id of the peer, NULL for last call
3864 * @param h hello message for the peer (can be NULL)
3865 * @param trust amount of trust we have in the peer (not used)
3868 check_hello_validated (void *cls,
3869 const struct GNUNET_PeerIdentity *peer,
3870 const struct GNUNET_HELLO_Message *h,
3873 struct CheckHelloValidatedContext *chvc = cls;
3874 struct GNUNET_HELLO_Message *plain_hello;
3875 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3876 struct GNUNET_PeerIdentity target;
3877 struct NeighbourList *n;
3882 if (GNUNET_NO == chvc->hello_known)
3884 /* notify PEERINFO about the peer now, so that we at least
3885 have the public key if some other component needs it */
3886 GNUNET_HELLO_get_key (chvc->hello, &pk);
3887 GNUNET_CRYPTO_hash (&pk,
3888 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3889 &target.hashPubKey);
3890 plain_hello = GNUNET_HELLO_create (&pk,
3893 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
3894 GNUNET_free (plain_hello);
3896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3897 "PEERINFO had no `%s' message for peer `%4s', full validation needed.\n",
3899 GNUNET_i2s (&target));
3901 GNUNET_STATISTICS_update (stats,
3902 gettext_noop ("# new HELLOs requiring full validation"),
3905 GNUNET_HELLO_iterate_addresses (chvc->hello,
3912 GNUNET_STATISTICS_update (stats,
3913 gettext_noop ("# duplicate HELLO (peer known)"),
3918 if (chvc->ve_count == 0)
3920 GNUNET_CONTAINER_DLL_remove (chvc_head,
3930 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3931 "PEERINFO had `%s' message for peer `%4s', validating only new addresses.\n",
3935 chvc->hello_known = GNUNET_YES;
3936 n = find_neighbour (peer);
3939 GNUNET_HELLO_iterate_addresses (h,
3941 &add_to_foreign_address_list,
3943 try_transmission_to_peer (n);
3947 GNUNET_STATISTICS_update (stats,
3948 gettext_noop ("# no existing neighbour record (validating HELLO)"),
3952 GNUNET_STATISTICS_update (stats,
3953 gettext_noop ("# HELLO validations (update case)"),
3956 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
3958 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
3965 * Process HELLO-message.
3967 * @param plugin transport involved, may be NULL
3968 * @param message the actual message
3969 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
3972 process_hello (struct TransportPlugin *plugin,
3973 const struct GNUNET_MessageHeader *message)
3976 struct GNUNET_PeerIdentity target;
3977 const struct GNUNET_HELLO_Message *hello;
3978 struct CheckHelloValidatedContext *chvc;
3979 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
3980 #if DEBUG_TRANSPORT_HELLO
3983 hsize = ntohs (message->size);
3984 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
3985 (hsize < sizeof (struct GNUNET_MessageHeader)))
3988 return GNUNET_SYSERR;
3990 GNUNET_STATISTICS_update (stats,
3991 gettext_noop ("# HELLOs received for validation"),
3994 /* first, check if load is too high */
3995 if (GNUNET_SCHEDULER_get_load (sched,
3996 GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
3998 GNUNET_STATISTICS_update (stats,
3999 gettext_noop ("# HELLOs ignored due to high load"),
4002 #if DEBUG_TRANSPORT_HELLO
4003 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4004 "Ignoring `%s' for `%4s', load too high.\n",
4006 GNUNET_i2s (&target));
4010 hello = (const struct GNUNET_HELLO_Message *) message;
4011 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
4013 #if DEBUG_TRANSPORT_HELLO
4014 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4015 "Unable to get public key from `%s' for `%4s'!\n",
4017 GNUNET_i2s (&target));
4019 GNUNET_break_op (0);
4020 return GNUNET_SYSERR;
4022 GNUNET_CRYPTO_hash (&publicKey,
4023 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4024 &target.hashPubKey);
4025 if (0 == memcmp (&my_identity,
4027 sizeof (struct GNUNET_PeerIdentity)))
4029 GNUNET_STATISTICS_update (stats,
4030 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
4036 while (NULL != chvc)
4038 if (GNUNET_HELLO_equals (hello,
4040 GNUNET_TIME_absolute_get ()).value > 0)
4042 #if DEBUG_TRANSPORT_HELLO
4043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4044 "Received duplicate `%s' message for `%4s'; ignored\n",
4046 GNUNET_i2s (&target));
4048 return GNUNET_OK; /* validation already pending */
4050 if (GNUNET_HELLO_size(hello) == GNUNET_HELLO_size (chvc->hello))
4051 GNUNET_break (0 != memcmp (hello, chvc->hello,
4052 GNUNET_HELLO_size(hello)));
4055 #if DEBUG_TRANSPORT_HELLO
4058 my_id = GNUNET_strdup(GNUNET_i2s(plugin->env.my_identity));
4059 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4060 "%s: Starting validation of `%s' message for `%4s' via '%s' of size %u\n",
4063 GNUNET_i2s (&target),
4065 GNUNET_HELLO_size(hello));
4069 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
4071 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
4072 memcpy (&chvc[1], hello, hsize);
4073 GNUNET_CONTAINER_DLL_insert (chvc_head,
4076 /* finally, check if HELLO was previously validated
4077 (continuation will then schedule actual validation) */
4078 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
4081 HELLO_VERIFICATION_TIMEOUT,
4082 &check_hello_validated, chvc);
4088 * The peer specified by the given neighbour has timed-out or a plugin
4089 * has disconnected. We may either need to do nothing (other plugins
4090 * still up), or trigger a full disconnect and clean up. This
4091 * function updates our state and does the necessary notifications.
4092 * Also notifies our clients that the neighbour is now officially
4095 * @param n the neighbour list entry for the peer
4096 * @param check should we just check if all plugins
4097 * disconnected or must we ask all plugins to
4101 disconnect_neighbour (struct NeighbourList *n, int check)
4103 struct ReadyList *rpos;
4104 struct NeighbourList *npos;
4105 struct NeighbourList *nprev;
4106 struct MessageQueue *mq;
4107 struct ForeignAddressList *peer_addresses;
4108 struct ForeignAddressList *peer_pos;
4110 if (GNUNET_YES == check)
4113 while (NULL != rpos)
4115 peer_addresses = rpos->addresses;
4116 while (peer_addresses != NULL)
4118 if (GNUNET_YES == peer_addresses->connected)
4119 return; /* still connected */
4120 peer_addresses = peer_addresses->next;
4126 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4127 "Disconnecting from `%4s'\n",
4128 GNUNET_i2s (&n->id));
4130 /* remove n from neighbours list */
4133 while ((npos != NULL) && (npos != n))
4138 GNUNET_assert (npos != NULL);
4140 neighbours = n->next;
4142 nprev->next = n->next;
4144 /* notify all clients about disconnect */
4145 if (GNUNET_YES == n->received_pong)
4146 notify_clients_disconnect (&n->id);
4148 /* clean up all plugins, cancel connections and pending transmissions */
4149 while (NULL != (rpos = n->plugins))
4151 n->plugins = rpos->next;
4152 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
4153 while (rpos->addresses != NULL)
4155 peer_pos = rpos->addresses;
4156 rpos->addresses = peer_pos->next;
4157 if (peer_pos->connected == GNUNET_YES)
4158 GNUNET_STATISTICS_update (stats,
4159 gettext_noop ("# connected addresses"),
4162 if (GNUNET_YES == peer_pos->validated)
4163 GNUNET_STATISTICS_update (stats,
4164 gettext_noop ("# peer addresses considered valid"),
4167 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
4169 GNUNET_SCHEDULER_cancel (sched,
4170 peer_pos->revalidate_task);
4171 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
4173 GNUNET_free(peer_pos);
4178 /* free all messages on the queue */
4179 while (NULL != (mq = n->messages_head))
4181 GNUNET_STATISTICS_update (stats,
4182 gettext_noop ("# bytes in message queue for other peers"),
4183 - (int64_t) mq->message_buf_size,
4185 GNUNET_STATISTICS_update (stats,
4186 gettext_noop ("# bytes discarded due to disconnect"),
4187 mq->message_buf_size,
4189 GNUNET_CONTAINER_DLL_remove (n->messages_head,
4192 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
4194 sizeof(struct GNUNET_PeerIdentity)));
4197 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
4199 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
4200 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
4202 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
4204 GNUNET_SCHEDULER_cancel (sched, n->retry_task);
4205 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
4207 if (n->piter != NULL)
4209 GNUNET_PEERINFO_iterate_cancel (n->piter);
4212 /* finally, free n itself */
4213 GNUNET_STATISTICS_update (stats,
4214 gettext_noop ("# active neighbours"),
4217 GNUNET_free_non_null (n->pre_connect_message_buffer);
4223 * We have received a PING message from someone. Need to send a PONG message
4224 * in response to the peer by any means necessary.
4227 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
4228 const struct GNUNET_PeerIdentity *peer,
4229 struct Session *session,
4230 const char *sender_address,
4231 uint16_t sender_address_len)
4233 struct TransportPlugin *plugin = cls;
4234 struct SessionHeader *session_header = (struct SessionHeader*) session;
4235 struct TransportPingMessage *ping;
4236 struct TransportPongMessage *pong;
4237 struct NeighbourList *n;
4238 struct ReadyList *rl;
4239 struct ForeignAddressList *fal;
4240 struct OwnAddressList *oal;
4245 if (ntohs (message->size) < sizeof (struct TransportPingMessage))
4247 GNUNET_break_op (0);
4248 return GNUNET_SYSERR;
4251 ping = (struct TransportPingMessage *) message;
4252 if (0 != memcmp (&ping->target,
4253 plugin->env.my_identity,
4254 sizeof (struct GNUNET_PeerIdentity)))
4256 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4257 _("Received `%s' message not destined for me!\n"),
4259 return GNUNET_SYSERR;
4262 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4263 "Processing `%s' from `%s'\n",
4265 (sender_address != NULL)
4266 ? a2s (plugin->short_name,
4267 (const struct sockaddr *)sender_address,
4271 GNUNET_STATISTICS_update (stats,
4272 gettext_noop ("# PING messages received"),
4275 addr = (const char*) &ping[1];
4276 alen = ntohs (message->size) - sizeof (struct TransportPingMessage);
4277 slen = strlen (plugin->short_name) + 1;
4280 /* peer wants to confirm that we have an outbound connection to him */
4281 if (session == NULL)
4283 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4284 _("Refusing to create PONG since I do not have a session with `%s'.\n"),
4286 return GNUNET_SYSERR;
4288 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4289 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4290 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4291 pong->purpose.size =
4292 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4294 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4295 sizeof (struct GNUNET_PeerIdentity) + sender_address_len + slen);
4296 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING);
4297 pong->challenge = ping->challenge;
4298 pong->addrlen = htonl(sender_address_len + slen);
4301 sizeof(struct GNUNET_PeerIdentity));
4305 memcpy (&((char*)&pong[1])[slen],
4307 sender_address_len);
4308 if (GNUNET_TIME_absolute_get_remaining (session_header->pong_sig_expires).value < PONG_SIGNATURE_LIFETIME.value / 4)
4310 /* create / update cached sig */
4312 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4313 "Creating PONG signature to indicate active connection.\n");
4315 session_header->pong_sig_expires = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
4316 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4317 GNUNET_assert (GNUNET_OK ==
4318 GNUNET_CRYPTO_rsa_sign (my_private_key,
4320 &session_header->pong_signature));
4324 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4326 memcpy (&pong->signature,
4327 &session_header->pong_signature,
4328 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4334 /* peer wants to confirm that this is one of our addresses */
4337 oal = plugin->addresses;
4340 if ( (oal->addrlen == alen) &&
4349 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4350 _("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
4351 a2s (plugin->short_name,
4356 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
4357 pong->header.size = htons (sizeof (struct TransportPongMessage) + alen + slen);
4358 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4359 pong->purpose.size =
4360 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4362 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4363 sizeof (struct GNUNET_PeerIdentity) + alen + slen);
4364 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
4365 pong->challenge = ping->challenge;
4366 pong->addrlen = htonl(alen + slen);
4369 sizeof(struct GNUNET_PeerIdentity));
4370 memcpy (&pong[1], plugin->short_name, slen);
4371 memcpy (&((char*)&pong[1])[slen], &oal[1], alen);
4372 if (GNUNET_TIME_absolute_get_remaining (oal->pong_sig_expires).value < PONG_SIGNATURE_LIFETIME.value / 4)
4374 /* create / update cached sig */
4376 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4377 "Creating PONG signature to indicate ownership.\n");
4379 oal->pong_sig_expires = GNUNET_TIME_absolute_min (oal->expires,
4380 GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4381 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4382 GNUNET_assert (GNUNET_OK ==
4383 GNUNET_CRYPTO_rsa_sign (my_private_key,
4385 &oal->pong_signature));
4389 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4391 memcpy (&pong->signature,
4392 &oal->pong_signature,
4393 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4395 n = find_neighbour(peer);
4396 GNUNET_assert (n != NULL);
4397 /* first try reliable response transmission */
4401 fal = rl->addresses;
4404 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4407 ntohs (pong->header.size),
4408 TRANSPORT_PONG_PRIORITY,
4409 HELLO_VERIFICATION_TIMEOUT,
4417 GNUNET_STATISTICS_update (stats,
4418 gettext_noop ("# PONGs unicast via reliable transport"),
4428 /* no reliable method found, do multicast */
4429 GNUNET_STATISTICS_update (stats,
4430 gettext_noop ("# PONGs multicast to all available addresses"),
4436 fal = rl->addresses;
4439 transmit_to_peer(NULL, fal,
4440 TRANSPORT_PONG_PRIORITY,
4441 HELLO_VERIFICATION_TIMEOUT,
4443 ntohs(pong->header.size),
4456 * Function called by the plugin for each received message.
4457 * Update data volumes, possibly notify plugins about
4458 * reducing the rate at which they read from the socket
4459 * and generally forward to our receive callback.
4461 * @param cls the "struct TransportPlugin *" we gave to the plugin
4462 * @param peer (claimed) identity of the other peer
4463 * @param message the message, NULL if we only care about
4464 * learning about the delay until we should receive again
4465 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
4466 * @param session identifier used for this session (can be NULL)
4467 * @param sender_address binary address of the sender (if observed)
4468 * @param sender_address_len number of bytes in sender_address
4469 * @return how long the plugin should wait until receiving more data
4470 * (plugins that do not support this, can ignore the return value)
4472 static struct GNUNET_TIME_Relative
4473 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4474 const struct GNUNET_MessageHeader *message,
4476 struct Session *session,
4477 const char *sender_address,
4478 uint16_t sender_address_len)
4480 struct TransportPlugin *plugin = cls;
4481 struct ReadyList *service_context;
4482 struct ForeignAddressList *peer_address;
4484 struct NeighbourList *n;
4485 struct GNUNET_TIME_Relative ret;
4487 if (is_blacklisted (peer, plugin))
4488 return GNUNET_TIME_UNIT_FOREVER_REL;
4490 n = find_neighbour (peer);
4492 n = setup_new_neighbour (peer, GNUNET_YES);
4493 service_context = n->plugins;
4494 while ((service_context != NULL) && (plugin != service_context->plugin))
4495 service_context = service_context->next;
4496 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4497 peer_address = NULL;
4498 if (message != NULL)
4500 if ( (session != NULL) ||
4501 (sender_address != NULL) )
4502 peer_address = add_peer_address (n,
4506 sender_address_len);
4507 if (peer_address != NULL)
4509 peer_address->distance = distance;
4510 if (GNUNET_YES == peer_address->validated)
4511 mark_address_connected (peer_address);
4512 peer_address->timeout
4514 GNUNET_TIME_relative_to_absolute
4515 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4516 schedule_next_ping (peer_address);
4518 /* update traffic received amount ... */
4519 msize = ntohs (message->size);
4520 GNUNET_STATISTICS_update (stats,
4521 gettext_noop ("# bytes received from other peers"),
4524 n->distance = distance;
4526 GNUNET_TIME_relative_to_absolute
4527 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4528 GNUNET_SCHEDULER_cancel (sched,
4531 GNUNET_SCHEDULER_add_delayed (sched,
4532 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4533 &neighbour_timeout_task, n);
4534 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4536 /* dropping message due to frequent inbound volume violations! */
4537 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4538 GNUNET_ERROR_TYPE_BULK,
4540 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4541 n->in_tracker.available_bytes_per_s__,
4542 n->quota_violation_count);
4543 GNUNET_STATISTICS_update (stats,
4544 gettext_noop ("# bandwidth quota violations by other peers"),
4547 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4550 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4551 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
4552 ntohs (message->type),
4553 ntohs (message->size),
4556 switch (ntohs (message->type))
4558 case GNUNET_MESSAGE_TYPE_HELLO:
4559 GNUNET_STATISTICS_update (stats,
4560 gettext_noop ("# HELLO messages received from other peers"),
4563 process_hello (plugin, message);
4565 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4566 handle_ping (plugin, message, peer, session, sender_address, sender_address_len);
4568 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4569 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4572 handle_payload_message (message, n);
4576 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4579 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4580 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4581 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4582 (unsigned int) n->in_tracker.available_bytes_per_s__,
4583 (unsigned long long) ret.value);
4584 GNUNET_STATISTICS_update (stats,
4585 gettext_noop ("# ms throttling suggested"),
4586 (int64_t) ret.value,
4593 * Handle START-message. This is the first message sent to us
4594 * by any client which causes us to add it to our list.
4596 * @param cls closure (always NULL)
4597 * @param client identification of the client
4598 * @param message the actual message
4601 handle_start (void *cls,
4602 struct GNUNET_SERVER_Client *client,
4603 const struct GNUNET_MessageHeader *message)
4605 struct TransportClient *c;
4606 struct ConnectInfoMessage cim;
4607 struct NeighbourList *n;
4610 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4611 "Received `%s' request from client\n", "START");
4616 if (c->client == client)
4618 /* client already on our list! */
4620 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4625 c = GNUNET_malloc (sizeof (struct TransportClient));
4629 if (our_hello != NULL)
4632 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4633 "Sending our own `%s' to new client\n", "HELLO");
4635 transmit_to_client (c,
4636 (const struct GNUNET_MessageHeader *) our_hello,
4638 /* tell new client about all existing connections */
4639 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
4640 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4644 if (GNUNET_YES == n->received_pong)
4647 cim.latency = GNUNET_TIME_relative_hton (n->latency);
4648 cim.distance = htonl (n->distance);
4649 transmit_to_client (c, &cim.header, GNUNET_NO);
4654 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4659 * Handle HELLO-message.
4661 * @param cls closure (always NULL)
4662 * @param client identification of the client
4663 * @param message the actual message
4666 handle_hello (void *cls,
4667 struct GNUNET_SERVER_Client *client,
4668 const struct GNUNET_MessageHeader *message)
4672 GNUNET_STATISTICS_update (stats,
4673 gettext_noop ("# HELLOs received from clients"),
4676 ret = process_hello (NULL, message);
4677 GNUNET_SERVER_receive_done (client, ret);
4682 * Closure for 'transmit_client_message'; followed by
4683 * 'msize' bytes of the actual message.
4685 struct TransmitClientMessageContext
4688 * Client on whom's behalf we are sending.
4690 struct GNUNET_SERVER_Client *client;
4693 * Timeout for the transmission.
4695 struct GNUNET_TIME_Absolute timeout;
4703 * Size of the message in bytes.
4710 * Schedule transmission of a message we got from a client to a peer.
4712 * @param cls the 'struct TransmitClientMessageContext*'
4713 * @param n destination, or NULL on error (in that case, drop the message)
4716 transmit_client_message (void *cls,
4717 struct NeighbourList *n)
4719 struct TransmitClientMessageContext *tcmc = cls;
4720 struct TransportClient *tc;
4723 while ((tc != NULL) && (tc->client != tcmc->client))
4728 transmit_to_peer (tc, NULL, tcmc->priority,
4729 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
4731 tcmc->msize, GNUNET_NO, n);
4733 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
4734 GNUNET_SERVER_client_drop (tcmc->client);
4740 * Handle SEND-message.
4742 * @param cls closure (always NULL)
4743 * @param client identification of the client
4744 * @param message the actual message
4747 handle_send (void *cls,
4748 struct GNUNET_SERVER_Client *client,
4749 const struct GNUNET_MessageHeader *message)
4751 const struct OutboundMessage *obm;
4752 const struct GNUNET_MessageHeader *obmm;
4753 struct TransmitClientMessageContext *tcmc;
4757 size = ntohs (message->size);
4759 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
4762 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4765 GNUNET_STATISTICS_update (stats,
4766 gettext_noop ("# payload received for other peers"),
4769 obm = (const struct OutboundMessage *) message;
4770 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
4771 msize = size - sizeof (struct OutboundMessage);
4773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4774 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
4775 "SEND", GNUNET_i2s (&obm->peer),
4779 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
4780 tcmc->client = client;
4781 tcmc->priority = ntohl (obm->priority);
4782 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
4783 tcmc->msize = msize;
4784 memcpy (&tcmc[1], obmm, msize);
4785 GNUNET_SERVER_client_keep (client);
4786 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
4787 &transmit_client_message,
4793 * Handle SET_QUOTA-message.
4795 * @param cls closure (always NULL)
4796 * @param client identification of the client
4797 * @param message the actual message
4800 handle_set_quota (void *cls,
4801 struct GNUNET_SERVER_Client *client,
4802 const struct GNUNET_MessageHeader *message)
4804 const struct QuotaSetMessage *qsm =
4805 (const struct QuotaSetMessage *) message;
4806 struct NeighbourList *n;
4808 GNUNET_STATISTICS_update (stats,
4809 gettext_noop ("# SET QUOTA messages received"),
4812 n = find_neighbour (&qsm->peer);
4815 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4816 GNUNET_STATISTICS_update (stats,
4817 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
4823 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4824 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
4826 (unsigned int) ntohl (qsm->quota.value__),
4827 (unsigned int) n->in_tracker.available_bytes_per_s__,
4828 GNUNET_i2s (&qsm->peer));
4830 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
4832 if (0 == ntohl (qsm->quota.value__))
4833 disconnect_neighbour (n, GNUNET_NO);
4834 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4839 * Take the given address and append it to the set of results sent back to
4842 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
4843 * @param address the resolved name, NULL to indicate the last response
4846 transmit_address_to_client (void *cls, const char *address)
4848 struct GNUNET_SERVER_TransmitContext *tc = cls;
4851 if (NULL == address)
4854 slen = strlen (address) + 1;
4856 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
4857 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
4858 if (NULL == address)
4859 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
4864 * Handle AddressLookup-message.
4866 * @param cls closure (always NULL)
4867 * @param client identification of the client
4868 * @param message the actual message
4871 handle_address_lookup (void *cls,
4872 struct GNUNET_SERVER_Client *client,
4873 const struct GNUNET_MessageHeader *message)
4875 const struct AddressLookupMessage *alum;
4876 struct TransportPlugin *lsPlugin;
4877 const char *nameTransport;
4878 const char *address;
4880 struct GNUNET_SERVER_TransmitContext *tc;
4881 struct GNUNET_TIME_Absolute timeout;
4882 struct GNUNET_TIME_Relative rtimeout;
4885 size = ntohs (message->size);
4886 if (size < sizeof (struct AddressLookupMessage))
4888 GNUNET_break_op (0);
4889 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4892 alum = (const struct AddressLookupMessage *) message;
4893 uint32_t addressLen = ntohl (alum->addrlen);
4894 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
4896 GNUNET_break_op (0);
4897 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4900 address = (const char *) &alum[1];
4901 nameTransport = (const char *) &address[addressLen];
4903 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
4905 GNUNET_break_op (0);
4906 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4909 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
4910 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
4911 numeric = ntohl (alum->numeric_only);
4912 lsPlugin = find_transport (nameTransport);
4913 if (NULL == lsPlugin)
4915 tc = GNUNET_SERVER_transmit_context_create (client);
4916 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
4917 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
4918 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
4921 tc = GNUNET_SERVER_transmit_context_create (client);
4922 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
4924 address, addressLen,
4927 &transmit_address_to_client, tc);
4932 * Setup the environment for this plugin.
4935 create_environment (struct TransportPlugin *plug)
4937 plug->env.cfg = cfg;
4938 plug->env.sched = sched;
4939 plug->env.my_identity = &my_identity;
4940 plug->env.cls = plug;
4941 plug->env.receive = &plugin_env_receive;
4942 plug->env.notify_address = &plugin_env_notify_address;
4943 plug->env.session_end = &plugin_env_session_end;
4944 plug->env.max_connections = max_connect_per_transport;
4945 plug->env.stats = stats;
4950 * Start the specified transport (load the plugin).
4953 start_transport (struct GNUNET_SERVER_Handle *server,
4956 struct TransportPlugin *plug;
4959 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4960 _("Loading `%s' transport plugin\n"), name);
4961 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
4962 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
4963 create_environment (plug);
4964 plug->short_name = GNUNET_strdup (name);
4965 plug->lib_name = libname;
4966 plug->next = plugins;
4968 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
4969 if (plug->api == NULL)
4971 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4972 _("Failed to load transport plugin for `%s'\n"), name);
4973 GNUNET_free (plug->short_name);
4974 plugins = plug->next;
4975 GNUNET_free (libname);
4982 * Called whenever a client is disconnected. Frees our
4983 * resources associated with that client.
4985 * @param cls closure
4986 * @param client identification of the client
4989 client_disconnect_notification (void *cls,
4990 struct GNUNET_SERVER_Client *client)
4992 struct TransportClient *pos;
4993 struct TransportClient *prev;
4994 struct ClientMessageQueueEntry *mqe;
4995 struct Blacklisters *bl;
4996 struct BlacklistCheck *bc;
5001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
5002 "Client disconnected, cleaning up.\n");
5004 /* clean up blacklister */
5008 if (bl->client == client)
5013 if (bc->bl_pos == bl)
5015 bc->bl_pos = bl->next;
5018 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
5021 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
5022 bc->task = GNUNET_SCHEDULER_add_now (sched,
5023 &do_blacklist_check,
5029 GNUNET_CONTAINER_DLL_remove (bl_head,
5032 GNUNET_SERVER_client_drop (bl->client);
5038 /* clean up 'normal' clients */
5041 while ((pos != NULL) && (pos->client != client))
5048 while (NULL != (mqe = pos->message_queue_head))
5050 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
5051 pos->message_queue_tail,
5053 pos->message_count--;
5057 clients = pos->next;
5059 prev->next = pos->next;
5060 if (GNUNET_YES == pos->tcs_pending)
5065 if (pos->th != NULL)
5067 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
5070 GNUNET_break (0 == pos->message_count);
5076 * Function called when the service shuts down. Unloads our plugins
5077 * and cancels pending validations.
5079 * @param cls closure, unused
5080 * @param tc task context (unused)
5083 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5085 struct TransportPlugin *plug;
5086 struct OwnAddressList *al;
5087 struct CheckHelloValidatedContext *chvc;
5089 while (neighbours != NULL)
5090 disconnect_neighbour (neighbours, GNUNET_NO);
5092 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5093 "Transport service is unloading plugins...\n");
5095 while (NULL != (plug = plugins))
5097 plugins = plug->next;
5098 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
5100 GNUNET_SCHEDULER_cancel (plug->env.sched,
5101 plug->address_update_task);
5102 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
5104 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
5105 GNUNET_free (plug->lib_name);
5106 GNUNET_free (plug->short_name);
5107 while (NULL != (al = plug->addresses))
5109 plug->addresses = al->next;
5114 if (my_private_key != NULL)
5115 GNUNET_CRYPTO_rsa_key_free (my_private_key);
5116 GNUNET_free_non_null (our_hello);
5118 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
5121 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5122 validation_map = NULL;
5124 /* free 'chvc' data structure */
5125 while (NULL != (chvc = chvc_head))
5127 chvc_head = chvc->next;
5128 if (chvc->piter != NULL)
5129 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
5132 GNUNET_assert (chvc->ve_count == 0);
5139 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5142 if (peerinfo != NULL)
5144 GNUNET_PEERINFO_disconnect (peerinfo);
5147 /* Can we assume those are gone by now, or do we need to clean up
5149 GNUNET_break (bl_head == NULL);
5150 GNUNET_break (bc_head == NULL);
5155 * Initiate transport service.
5157 * @param cls closure
5158 * @param s scheduler to use
5159 * @param server the initialized server
5160 * @param c configuration to use
5164 struct GNUNET_SCHEDULER_Handle *s,
5165 struct GNUNET_SERVER_Handle *server,
5166 const struct GNUNET_CONFIGURATION_Handle *c)
5168 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
5169 {&handle_start, NULL,
5170 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
5171 {&handle_hello, NULL,
5172 GNUNET_MESSAGE_TYPE_HELLO, 0},
5173 {&handle_send, NULL,
5174 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
5175 {&handle_set_quota, NULL,
5176 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
5177 {&handle_address_lookup, NULL,
5178 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
5180 {&handle_blacklist_init, NULL,
5181 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
5182 {&handle_blacklist_reply, NULL,
5183 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
5189 unsigned long long tneigh;
5194 stats = GNUNET_STATISTICS_create (sched, "transport", cfg);
5195 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
5196 /* parse configuration */
5198 GNUNET_CONFIGURATION_get_value_number (c,
5203 GNUNET_CONFIGURATION_get_value_filename (c,
5205 "HOSTKEY", &keyfile)))
5207 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5209 ("Transport service is lacking key configuration settings. Exiting.\n"));
5210 GNUNET_SCHEDULER_shutdown (s);
5213 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5216 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5217 validation_map = NULL;
5220 max_connect_per_transport = (uint32_t) tneigh;
5221 peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
5222 if (peerinfo == NULL)
5224 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5225 _("Could not access PEERINFO service. Exiting.\n"));
5226 GNUNET_SCHEDULER_shutdown (s);
5229 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5232 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5233 validation_map = NULL;
5234 GNUNET_free (keyfile);
5237 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
5238 GNUNET_free (keyfile);
5239 if (my_private_key == NULL)
5241 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5243 ("Transport service could not access hostkey. Exiting.\n"));
5244 GNUNET_SCHEDULER_shutdown (s);
5247 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5250 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5251 validation_map = NULL;
5254 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
5255 GNUNET_CRYPTO_hash (&my_public_key,
5256 sizeof (my_public_key), &my_identity.hashPubKey);
5257 /* setup notification */
5258 GNUNET_SERVER_disconnect_notify (server,
5259 &client_disconnect_notification, NULL);
5260 /* load plugins... */
5263 GNUNET_CONFIGURATION_get_value_string (c,
5264 "TRANSPORT", "PLUGINS", &plugs))
5266 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5267 _("Starting transport plugins `%s'\n"), plugs);
5268 pos = strtok (plugs, " ");
5271 start_transport (server, pos);
5273 pos = strtok (NULL, " ");
5275 GNUNET_free (plugs);
5277 GNUNET_SCHEDULER_add_delayed (sched,
5278 GNUNET_TIME_UNIT_FOREVER_REL,
5279 &shutdown_task, NULL);
5284 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
5286 /* If we have a blacklist file, read from it */
5287 read_blacklist_file(cfg);
5288 /* process client requests */
5289 GNUNET_SERVER_add_handlers (server, handlers);
5294 * The main function for the transport service.
5296 * @param argc number of arguments from the command line
5297 * @param argv command line arguments
5298 * @return 0 ok, 1 on error
5301 main (int argc, char *const *argv)
5303 a2s (NULL, NULL, 0); /* make compiler happy */
5304 return (GNUNET_OK ==
5305 GNUNET_SERVICE_run (argc,
5308 GNUNET_SERVICE_OPTION_NONE,
5309 &run, NULL)) ? 0 : 1;
5312 /* end of gnunet-service-transport.c */