2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file transport/gnunet-service-transport.c
23 * @brief low-level P2P messaging
24 * @author Christian Grothoff
28 #include "gnunet_client_lib.h"
29 #include "gnunet_container_lib.h"
30 #include "gnunet_constants.h"
31 #include "gnunet_getopt_lib.h"
32 #include "gnunet_hello_lib.h"
33 #include "gnunet_os_lib.h"
34 #include "gnunet_peerinfo_service.h"
35 #include "gnunet_plugin_lib.h"
36 #include "gnunet_protocols.h"
37 #include "gnunet_service_lib.h"
38 #include "gnunet_signatures.h"
39 #include "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);
1115 transport_name = GNUNET_malloc(tsize + 1);
1116 memcpy(transport_name, &data[pos], tsize);
1117 pos = colon_pos + 1;
1119 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1120 _("Read transport name %s in blacklist file.\n"),
1123 memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
1124 if (!isspace ( (unsigned char) enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
1126 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1127 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1128 (unsigned long long) pos);
1130 while ((pos < frstat.st_size) && (!isspace ( (unsigned char) data[pos])))
1132 GNUNET_free_non_null(transport_name);
1135 enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
1136 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
1138 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1139 _("Syntax error in blacklist file at offset %llu, skipping bytes `%s'.\n"),
1140 (unsigned long long) pos,
1145 if (0 != memcmp (&pid,
1147 sizeof (struct GNUNET_PeerIdentity)))
1150 add_peer_to_blacklist (&pid,
1155 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1156 _("Found myself `%s' in blacklist (useless, ignored)\n"),
1160 pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
1161 GNUNET_free_non_null(transport_name);
1162 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1171 * Function called to notify a client about the socket being ready to
1172 * queue more data. "buf" will be NULL and "size" zero if the socket
1173 * was closed for writing in the meantime.
1175 * @param cls closure
1176 * @param size number of bytes available in buf
1177 * @param buf where the callee should write the message
1178 * @return number of bytes written to buf
1181 transmit_to_client_callback (void *cls, size_t size, void *buf)
1183 struct TransportClient *client = cls;
1184 struct ClientMessageQueueEntry *q;
1187 const struct GNUNET_MessageHeader *msg;
1193 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1194 "Transmission to client failed, closing connection.\n");
1195 /* fatal error with client, free message queue! */
1196 while (NULL != (q = client->message_queue_head))
1198 GNUNET_STATISTICS_update (stats,
1199 gettext_noop ("# bytes discarded (could not transmit to client)"),
1200 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
1202 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1203 client->message_queue_tail,
1207 client->message_count = 0;
1212 while (NULL != (q = client->message_queue_head))
1214 msg = (const struct GNUNET_MessageHeader *) &q[1];
1215 msize = ntohs (msg->size);
1216 if (msize + tsize > size)
1219 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1220 "Transmitting message of type %u to client.\n",
1223 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1224 client->message_queue_tail,
1226 memcpy (&cbuf[tsize], msg, msize);
1229 client->message_count--;
1233 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1234 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1236 GNUNET_TIME_UNIT_FOREVER_REL,
1237 &transmit_to_client_callback,
1239 GNUNET_assert (client->th != NULL);
1246 * Convert an address to a string.
1248 * @param plugin name of the plugin responsible for the address
1249 * @param addr binary address
1250 * @param addr_len number of bytes in addr
1251 * @return NULL on error, otherwise address string
1254 a2s (const char *plugin,
1258 struct TransportPlugin *p;
1262 p = find_transport (plugin);
1265 return p->api->address_to_string (p->api->cls,
1272 * Mark the given FAL entry as 'connected' (and hence preferred for
1273 * sending); also mark all others for the same peer as 'not connected'
1274 * (since only one can be preferred).
1276 * @param fal address to set to 'connected'
1279 mark_address_connected (struct ForeignAddressList *fal)
1281 struct ForeignAddressList *pos;
1284 GNUNET_assert (GNUNET_YES == fal->validated);
1285 if (fal->connected == GNUNET_YES)
1286 return; /* nothing to do */
1288 pos = fal->ready_list->addresses;
1291 if (GNUNET_YES == pos->connected)
1294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1295 "Marking address `%s' as no longer connected (due to connect on other address)\n",
1296 a2s (pos->ready_list->plugin->short_name,
1300 GNUNET_break (cnt == GNUNET_YES);
1302 pos->connected = GNUNET_NO;
1303 GNUNET_STATISTICS_update (stats,
1304 gettext_noop ("# connected addresses"),
1310 fal->connected = GNUNET_YES;
1311 if (GNUNET_YES == cnt)
1313 GNUNET_STATISTICS_update (stats,
1314 gettext_noop ("# connected addresses"),
1322 * Send the specified message to the specified client. Since multiple
1323 * messages may be pending for the same client at a time, this code
1324 * makes sure that no message is lost.
1326 * @param client client to transmit the message to
1327 * @param msg the message to send
1328 * @param may_drop can this message be dropped if the
1329 * message queue for this client is getting far too large?
1332 transmit_to_client (struct TransportClient *client,
1333 const struct GNUNET_MessageHeader *msg, int may_drop)
1335 struct ClientMessageQueueEntry *q;
1338 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
1340 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1342 ("Dropping message of type %u and size %u, have %u messages pending (%u is the soft limit)\n"),
1345 client->message_count,
1347 GNUNET_STATISTICS_update (stats,
1348 gettext_noop ("# messages dropped due to slow client"),
1353 msize = ntohs (msg->size);
1354 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1355 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1356 memcpy (&q[1], msg, msize);
1357 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1358 client->message_queue_tail,
1359 client->message_queue_tail,
1361 client->message_count++;
1362 if (client->th == NULL)
1364 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1366 GNUNET_TIME_UNIT_FOREVER_REL,
1367 &transmit_to_client_callback,
1369 GNUNET_assert (client->th != NULL);
1375 * Transmit a 'SEND_OK' notification to the given client for the
1378 * @param client who to notify
1379 * @param n neighbour to notify about
1380 * @param result status code for the transmission request
1383 transmit_send_ok (struct TransportClient *client,
1384 struct NeighbourList *n,
1387 struct SendOkMessage send_ok_msg;
1389 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1390 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1391 send_ok_msg.success = htonl (result);
1392 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1393 send_ok_msg.peer = n->id;
1394 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1399 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1400 * upon "completion" of a send request. This tells the API
1401 * that it is now legal to send another message to the given
1404 * @param cls closure, identifies the entry on the
1405 * message queue that was transmitted and the
1406 * client responsible for queueing the message
1407 * @param target the peer receiving the message
1408 * @param result GNUNET_OK on success, if the transmission
1409 * failed, we should not tell the client to transmit
1413 transmit_send_continuation (void *cls,
1414 const struct GNUNET_PeerIdentity *target,
1417 struct MessageQueue *mq = cls;
1418 struct NeighbourList *n;
1420 GNUNET_STATISTICS_update (stats,
1421 gettext_noop ("# bytes pending with plugins"),
1422 - (int64_t) mq->message_buf_size,
1424 if (result == GNUNET_OK)
1426 GNUNET_STATISTICS_update (stats,
1427 gettext_noop ("# bytes successfully transmitted by plugins"),
1428 mq->message_buf_size,
1433 GNUNET_STATISTICS_update (stats,
1434 gettext_noop ("# bytes with transmission failure by plugins"),
1435 mq->message_buf_size,
1438 n = find_neighbour(&mq->neighbour_id);
1439 GNUNET_assert (n != NULL);
1440 if (mq->specific_address != NULL)
1442 if (result == GNUNET_OK)
1444 mq->specific_address->timeout =
1445 GNUNET_TIME_relative_to_absolute
1446 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1447 if (mq->specific_address->validated == GNUNET_YES)
1448 mark_address_connected (mq->specific_address);
1452 if (mq->specific_address->connected != GNUNET_NO)
1455 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1456 "Marking address `%s' as no longer connected (due to transmission problem)\n",
1457 a2s (mq->specific_address->ready_list->plugin->short_name,
1458 mq->specific_address->addr,
1459 mq->specific_address->addrlen));
1461 GNUNET_STATISTICS_update (stats,
1462 gettext_noop ("# connected addresses"),
1465 mq->specific_address->connected = GNUNET_NO;
1468 if (! mq->internal_msg)
1469 mq->specific_address->in_transmit = GNUNET_NO;
1471 if (mq->client != NULL)
1472 transmit_send_ok (mq->client, n, result);
1474 try_transmission_to_peer (n);
1479 * Find an address in any of the available transports for
1480 * the given neighbour that would be good for message
1481 * transmission. This is essentially the transport selection
1484 * @param neighbour for whom to select an address
1485 * @return selected address, NULL if we have none
1487 struct ForeignAddressList *
1488 find_ready_address(struct NeighbourList *neighbour)
1490 struct ReadyList *head = neighbour->plugins;
1491 struct ForeignAddressList *addresses;
1492 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1493 struct ForeignAddressList *best_address;
1495 best_address = NULL;
1496 while (head != NULL)
1498 addresses = head->addresses;
1499 while (addresses != NULL)
1501 if ( (addresses->timeout.value < now.value) &&
1502 (addresses->connected == GNUNET_YES) )
1505 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1506 "Marking long-time inactive connection to `%4s' as down.\n",
1507 GNUNET_i2s (&neighbour->id));
1509 GNUNET_STATISTICS_update (stats,
1510 gettext_noop ("# connected addresses"),
1513 addresses->connected = GNUNET_NO;
1515 addresses = addresses->next;
1518 addresses = head->addresses;
1519 while (addresses != NULL)
1521 #if DEBUG_TRANSPORT > 1
1522 if (addresses->addr != NULL)
1523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1524 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1525 a2s (head->plugin->short_name,
1527 addresses->addrlen),
1528 GNUNET_i2s (&neighbour->id),
1529 addresses->connected,
1530 addresses->in_transmit,
1531 addresses->validated,
1532 addresses->connect_attempts,
1533 (unsigned long long) addresses->timeout.value,
1534 (unsigned int) addresses->distance);
1536 if ( ( (best_address == NULL) ||
1537 (addresses->connected == GNUNET_YES) ||
1538 (best_address->connected == GNUNET_NO) ) &&
1539 (addresses->in_transmit == GNUNET_NO) &&
1540 ( (best_address == NULL) ||
1541 (addresses->latency.value < best_address->latency.value)) )
1542 best_address = addresses;
1543 /* FIXME: also give lower-latency addresses that are not
1544 connected a chance some times... */
1545 addresses = addresses->next;
1549 if (best_address != NULL)
1552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1553 "Best address found (`%s') has latency of %llu ms.\n",
1554 (best_address->addrlen > 0)
1555 ? a2s (best_address->ready_list->plugin->short_name,
1557 best_address->addrlen)
1559 best_address->latency.value);
1564 GNUNET_STATISTICS_update (stats,
1565 gettext_noop ("# transmission attempts failed (no address)"),
1569 return best_address;
1575 * We should re-try transmitting to the given peer,
1576 * hopefully we've learned something in the meantime.
1579 retry_transmission_task (void *cls,
1580 const struct GNUNET_SCHEDULER_TaskContext *tc)
1582 struct NeighbourList *n = cls;
1584 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1585 try_transmission_to_peer (n);
1590 * Check the ready list for the given neighbour and if a plugin is
1591 * ready for transmission (and if we have a message), do so!
1593 * @param neighbour target peer for which to transmit
1596 try_transmission_to_peer (struct NeighbourList *neighbour)
1598 struct ReadyList *rl;
1599 struct MessageQueue *mq;
1600 struct GNUNET_TIME_Relative timeout;
1604 if (neighbour->messages_head == NULL)
1607 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1608 "Transmission queue for `%4s' is empty\n",
1609 GNUNET_i2s (&neighbour->id));
1611 return; /* nothing to do */
1614 mq = neighbour->messages_head;
1615 force_address = GNUNET_YES;
1616 if (mq->specific_address == NULL)
1618 mq->specific_address = find_ready_address(neighbour);
1619 GNUNET_STATISTICS_update (stats,
1620 gettext_noop ("# transport selected peer address freely"),
1623 force_address = GNUNET_NO;
1625 if (mq->specific_address == NULL)
1627 GNUNET_STATISTICS_update (stats,
1628 gettext_noop ("# transport failed to selected peer address"),
1631 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1632 if (timeout.value == 0)
1635 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1636 "No destination address available to transmit message of size %u to peer `%4s'\n",
1637 mq->message_buf_size,
1638 GNUNET_i2s (&mq->neighbour_id));
1640 GNUNET_STATISTICS_update (stats,
1641 gettext_noop ("# bytes in message queue for other peers"),
1642 - (int64_t) mq->message_buf_size,
1644 GNUNET_STATISTICS_update (stats,
1645 gettext_noop ("# bytes discarded (no destination address available)"),
1646 mq->message_buf_size,
1648 if (mq->client != NULL)
1649 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1650 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1651 neighbour->messages_tail,
1654 return; /* nobody ready */
1656 GNUNET_STATISTICS_update (stats,
1657 gettext_noop ("# message delivery deferred (no address)"),
1660 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1661 GNUNET_SCHEDULER_cancel (sched,
1662 neighbour->retry_task);
1663 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (sched,
1665 &retry_transmission_task,
1668 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1669 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1670 mq->message_buf_size,
1671 GNUNET_i2s (&mq->neighbour_id),
1674 /* FIXME: might want to trigger peerinfo lookup here
1675 (unless that's already pending...) */
1678 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1679 neighbour->messages_tail,
1681 if (mq->specific_address->connected == GNUNET_NO)
1682 mq->specific_address->connect_attempts++;
1683 rl = mq->specific_address->ready_list;
1684 mq->plugin = rl->plugin;
1685 if (!mq->internal_msg)
1686 mq->specific_address->in_transmit = GNUNET_YES;
1688 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1689 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1690 mq->message_buf_size,
1691 GNUNET_i2s (&neighbour->id),
1692 (mq->specific_address->addr != NULL)
1693 ? a2s (mq->plugin->short_name,
1694 mq->specific_address->addr,
1695 mq->specific_address->addrlen)
1697 rl->plugin->short_name);
1699 GNUNET_STATISTICS_update (stats,
1700 gettext_noop ("# bytes in message queue for other peers"),
1701 - (int64_t) mq->message_buf_size,
1703 GNUNET_STATISTICS_update (stats,
1704 gettext_noop ("# bytes pending with plugins"),
1705 mq->message_buf_size,
1707 ret = rl->plugin->api->send (rl->plugin->api->cls,
1710 mq->message_buf_size,
1712 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1713 mq->specific_address->session,
1714 mq->specific_address->addr,
1715 mq->specific_address->addrlen,
1717 &transmit_send_continuation, mq);
1720 /* failure, but 'send' would not call continuation in this case,
1721 so we need to do it here! */
1722 transmit_send_continuation (mq,
1730 * Send the specified message to the specified peer.
1732 * @param client source of the transmission request (can be NULL)
1733 * @param peer_address ForeignAddressList where we should send this message
1734 * @param priority how important is the message
1735 * @param timeout how long do we have to transmit?
1736 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1737 * @param message_buf_size total size of all messages in message_buf
1738 * @param is_internal is this an internal message; these are pre-pended and
1739 * also do not count for plugins being "ready" to transmit
1740 * @param neighbour handle to the neighbour for transmission
1743 transmit_to_peer (struct TransportClient *client,
1744 struct ForeignAddressList *peer_address,
1745 unsigned int priority,
1746 struct GNUNET_TIME_Relative timeout,
1747 const char *message_buf,
1748 size_t message_buf_size,
1749 int is_internal, struct NeighbourList *neighbour)
1751 struct MessageQueue *mq;
1756 /* check for duplicate submission */
1757 mq = neighbour->messages_head;
1760 if (mq->client == client)
1762 /* client transmitted to same peer twice
1763 before getting SEND_OK! */
1771 GNUNET_STATISTICS_update (stats,
1772 gettext_noop ("# bytes in message queue for other peers"),
1775 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1776 mq->specific_address = peer_address;
1777 mq->client = client;
1778 /* FIXME: this memcpy can be up to 7% of our total runtime! */
1779 memcpy (&mq[1], message_buf, message_buf_size);
1780 mq->message_buf = (const char*) &mq[1];
1781 mq->message_buf_size = message_buf_size;
1782 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1783 mq->internal_msg = is_internal;
1784 mq->priority = priority;
1785 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1787 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1788 neighbour->messages_tail,
1791 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1792 neighbour->messages_tail,
1793 neighbour->messages_tail,
1795 try_transmission_to_peer (neighbour);
1802 struct GeneratorContext
1804 struct TransportPlugin *plug_pos;
1805 struct OwnAddressList *addr_pos;
1806 struct GNUNET_TIME_Absolute expiration;
1814 address_generator (void *cls, size_t max, void *buf)
1816 struct GeneratorContext *gc = cls;
1819 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1821 gc->plug_pos = gc->plug_pos->next;
1822 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1824 if (NULL == gc->plug_pos)
1829 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1832 gc->addr_pos->addrlen, buf, max);
1833 gc->addr_pos = gc->addr_pos->next;
1839 * Construct our HELLO message from all of the addresses of
1840 * all of the transports.
1845 struct GNUNET_HELLO_Message *hello;
1846 struct TransportClient *cpos;
1847 struct NeighbourList *npos;
1848 struct GeneratorContext gc;
1850 gc.plug_pos = plugins;
1851 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1852 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1853 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1855 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1856 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1858 GNUNET_STATISTICS_update (stats,
1859 gettext_noop ("# refreshed my HELLO"),
1863 while (cpos != NULL)
1865 transmit_to_client (cpos,
1866 (const struct GNUNET_MessageHeader *) hello,
1871 GNUNET_free_non_null (our_hello);
1873 GNUNET_PEERINFO_add_peer (peerinfo, our_hello);
1875 while (npos != NULL)
1878 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1879 "Transmitting updated `%s' to neighbour `%4s'\n",
1880 "HELLO", GNUNET_i2s (&npos->id));
1882 GNUNET_STATISTICS_update (stats,
1883 gettext_noop ("# transmitted my HELLO to other peers"),
1886 transmit_to_peer (NULL, NULL, 0,
1887 HELLO_ADDRESS_EXPIRATION,
1888 (const char *) our_hello,
1889 GNUNET_HELLO_size(our_hello),
1897 * Task used to clean up expired addresses for a plugin.
1899 * @param cls closure
1903 expire_address_task (void *cls,
1904 const struct GNUNET_SCHEDULER_TaskContext *tc);
1908 * Update the list of addresses for this plugin,
1909 * expiring those that are past their expiration date.
1911 * @param plugin addresses of which plugin should be recomputed?
1912 * @param fresh set to GNUNET_YES if a new address was added
1913 * and we need to regenerate the HELLO even if nobody
1917 update_addresses (struct TransportPlugin *plugin, int fresh)
1919 static struct GNUNET_TIME_Absolute last_update;
1920 struct GNUNET_TIME_Relative min_remaining;
1921 struct GNUNET_TIME_Relative remaining;
1922 struct GNUNET_TIME_Absolute now;
1923 struct OwnAddressList *pos;
1924 struct OwnAddressList *prev;
1925 struct OwnAddressList *next;
1928 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1929 GNUNET_SCHEDULER_cancel (plugin->env.sched, plugin->address_update_task);
1930 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1931 now = GNUNET_TIME_absolute_get ();
1932 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1933 expired = (GNUNET_TIME_absolute_get_duration (last_update).value > (HELLO_ADDRESS_EXPIRATION.value / 4));
1935 pos = plugin->addresses;
1939 if (pos->expires.value < now.value)
1941 expired = GNUNET_YES;
1943 plugin->addresses = pos->next;
1945 prev->next = pos->next;
1950 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1951 if (remaining.value < min_remaining.value)
1952 min_remaining = remaining;
1958 if (expired || fresh)
1963 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1964 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1966 plugin->address_update_task
1967 = GNUNET_SCHEDULER_add_delayed (plugin->env.sched,
1969 &expire_address_task, plugin);
1974 * Task used to clean up expired addresses for a plugin.
1976 * @param cls closure
1980 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1982 struct TransportPlugin *plugin = cls;
1984 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1985 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1986 update_addresses (plugin, GNUNET_NO);
1991 * Iterator over hash map entries that NULLs the session of validation
1992 * entries that match the given session.
1994 * @param cls closure (the 'struct Session*' to match against)
1995 * @param key current key code (peer ID, not used)
1996 * @param value value in the hash map ('struct ValidationEntry*')
1997 * @return GNUNET_YES (we should continue to iterate)
2000 remove_session_validations (void *cls,
2001 const GNUNET_HashCode * key,
2004 struct Session *session = cls;
2005 struct ValidationEntry *ve = value;
2007 if (session == ve->session)
2014 * Function that will be called whenever the plugin internally
2015 * cleans up a session pointer and hence the service needs to
2016 * discard all of those sessions as well. Plugins that do not
2017 * use sessions can simply omit calling this function and always
2018 * use NULL wherever a session pointer is needed.
2020 * @param cls closure
2021 * @param peer which peer was the session for
2022 * @param session which session is being destoyed
2025 plugin_env_session_end (void *cls,
2026 const struct GNUNET_PeerIdentity *peer,
2027 struct Session *session)
2029 struct TransportPlugin *p = cls;
2030 struct NeighbourList *nl;
2031 struct ReadyList *rl;
2032 struct ForeignAddressList *pos;
2033 struct ForeignAddressList *prev;
2035 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2036 &remove_session_validations,
2038 nl = find_neighbour (peer);
2044 if (rl->plugin == p)
2051 pos = rl->addresses;
2052 while ( (pos != NULL) &&
2053 (pos->session != session) )
2060 pos->session = NULL;
2061 if (pos->addrlen != 0)
2064 rl->addresses = pos->next;
2066 prev->next = pos->next;
2067 if (GNUNET_SCHEDULER_NO_TASK != pos->revalidate_task)
2069 GNUNET_SCHEDULER_cancel (sched,
2070 pos->revalidate_task);
2071 pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2074 if (nl->received_pong == GNUNET_NO)
2075 return; /* nothing to do */
2076 /* check if we have any validated addresses left */
2077 pos = rl->addresses;
2084 /* no valid addresses left, signal disconnect! */
2085 disconnect_neighbour (nl, GNUNET_NO);
2090 * Function that must be called by each plugin to notify the
2091 * transport service about the addresses under which the transport
2092 * provided by the plugin can be reached.
2094 * @param cls closure
2095 * @param name name of the transport that generated the address
2096 * @param addr one of the addresses of the host, NULL for the last address
2097 * the specific address format depends on the transport
2098 * @param addrlen length of the address
2099 * @param expires when should this address automatically expire?
2102 plugin_env_notify_address (void *cls,
2106 struct GNUNET_TIME_Relative expires)
2108 struct TransportPlugin *p = cls;
2109 struct OwnAddressList *al;
2110 struct GNUNET_TIME_Absolute abex;
2112 GNUNET_assert (addr != NULL);
2113 abex = GNUNET_TIME_relative_to_absolute (expires);
2114 GNUNET_assert (p == find_transport (name));
2118 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
2120 if (al->expires.value < abex.value)
2127 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
2128 al->next = p->addresses;
2131 al->addrlen = addrlen;
2132 memcpy (&al[1], addr, addrlen);
2133 update_addresses (p, GNUNET_YES);
2138 * Notify all of our clients about a peer connecting.
2141 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
2142 struct GNUNET_TIME_Relative latency,
2145 struct ConnectInfoMessage cim;
2146 struct TransportClient *cpos;
2149 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2150 "Notifying clients about connection from `%s'\n",
2153 GNUNET_STATISTICS_update (stats,
2154 gettext_noop ("# peers connected"),
2157 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
2158 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2159 cim.distance = htonl (distance);
2160 cim.latency = GNUNET_TIME_relative_hton (latency);
2161 memcpy (&cim.id, peer, sizeof (struct GNUNET_PeerIdentity));
2163 while (cpos != NULL)
2165 transmit_to_client (cpos, &cim.header, GNUNET_NO);
2172 * Notify all of our clients about a peer disconnecting.
2175 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2177 struct DisconnectInfoMessage dim;
2178 struct TransportClient *cpos;
2181 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2182 "Notifying clients about lost connection to `%s'\n",
2185 GNUNET_STATISTICS_update (stats,
2186 gettext_noop ("# peers connected"),
2189 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2190 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2191 dim.reserved = htonl (0);
2192 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2194 while (cpos != NULL)
2196 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2203 * Find a ForeignAddressList entry for the given neighbour
2204 * that matches the given address and transport.
2206 * @param neighbour which peer we care about
2207 * @param tname name of the transport plugin
2208 * @param session session to look for, NULL for 'any'; otherwise
2209 * can be used for the service to "learn" this session ID
2211 * @param addr binary address
2212 * @param addrlen length of addr
2213 * @return NULL if no such entry exists
2215 static struct ForeignAddressList *
2216 find_peer_address(struct NeighbourList *neighbour,
2218 struct Session *session,
2222 struct ReadyList *head;
2223 struct ForeignAddressList *pos;
2225 head = neighbour->plugins;
2226 while (head != NULL)
2228 if (0 == strcmp (tname, head->plugin->short_name))
2234 pos = head->addresses;
2235 while ( (pos != NULL) &&
2236 ( (pos->addrlen != addrlen) ||
2237 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2239 if ( (session != NULL) &&
2240 (pos->session == session) )
2244 if ( (session != NULL) && (pos != NULL) )
2245 pos->session = session; /* learn it! */
2251 * Get the peer address struct for the given neighbour and
2252 * address. If it doesn't yet exist, create it.
2254 * @param neighbour which peer we care about
2255 * @param tname name of the transport plugin
2256 * @param session session of the plugin, or NULL for none
2257 * @param addr binary address
2258 * @param addrlen length of addr
2259 * @return NULL if we do not have a transport plugin for 'tname'
2261 static struct ForeignAddressList *
2262 add_peer_address (struct NeighbourList *neighbour,
2264 struct Session *session,
2268 struct ReadyList *head;
2269 struct ForeignAddressList *ret;
2271 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2274 head = neighbour->plugins;
2276 while (head != NULL)
2278 if (0 == strcmp (tname, head->plugin->short_name))
2284 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2285 ret->session = session;
2288 ret->addr = (const char*) &ret[1];
2289 memcpy (&ret[1], addr, addrlen);
2295 ret->addrlen = addrlen;
2296 ret->expires = GNUNET_TIME_relative_to_absolute
2297 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2298 ret->latency = GNUNET_TIME_relative_get_forever();
2300 ret->timeout = GNUNET_TIME_relative_to_absolute
2301 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2302 ret->ready_list = head;
2303 ret->next = head->addresses;
2304 head->addresses = ret;
2310 * Closure for 'add_validated_address'.
2312 struct AddValidatedAddressContext
2315 * Entry that has been validated.
2317 const struct ValidationEntry *ve;
2320 * Flag set after we have added the address so
2321 * that we terminate the iteration next time.
2328 * Callback function used to fill a buffer of max bytes with a list of
2329 * addresses in the format used by HELLOs. Should use
2330 * "GNUNET_HELLO_add_address" as a helper function.
2332 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2333 * @param max maximum number of bytes that can be written to buf
2334 * @param buf where to write the address information
2335 * @return number of bytes written, 0 to signal the
2336 * end of the iteration.
2339 add_validated_address (void *cls,
2340 size_t max, void *buf)
2342 struct AddValidatedAddressContext *avac = cls;
2343 const struct ValidationEntry *ve = avac->ve;
2345 if (GNUNET_YES == avac->done)
2347 avac->done = GNUNET_YES;
2348 return GNUNET_HELLO_add_address (ve->transport_name,
2349 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2359 * Closure for 'check_address_exists'.
2361 struct CheckAddressExistsClosure
2364 * Address to check for.
2369 * Name of the transport.
2376 struct Session *session;
2379 * Set to GNUNET_YES if the address exists.
2392 * Iterator over hash map entries. Checks if the given
2393 * validation entry is for the same address as what is given
2396 * @param cls the 'struct CheckAddressExistsClosure*'
2397 * @param key current key code (ignored)
2398 * @param value value in the hash map ('struct ValidationEntry')
2399 * @return GNUNET_YES if we should continue to
2400 * iterate (mismatch), GNUNET_NO if not (entry matched)
2403 check_address_exists (void *cls,
2404 const GNUNET_HashCode * key,
2407 struct CheckAddressExistsClosure *caec = cls;
2408 struct ValidationEntry *ve = value;
2410 if ( (0 == strcmp (caec->tname,
2411 ve->transport_name)) &&
2412 (caec->addrlen == ve->addrlen) &&
2413 (0 == memcmp (caec->addr,
2417 caec->exists = GNUNET_YES;
2420 if ( (ve->session != NULL) &&
2421 (caec->session == ve->session) )
2423 caec->exists = GNUNET_YES;
2432 * Iterator to free entries in the validation_map.
2434 * @param cls closure (unused)
2435 * @param key current key code
2436 * @param value value in the hash map (validation to abort)
2437 * @return GNUNET_YES (always)
2440 abort_validation (void *cls,
2441 const GNUNET_HashCode * key,
2444 struct ValidationEntry *va = value;
2446 if (GNUNET_SCHEDULER_NO_TASK != va->timeout_task)
2447 GNUNET_SCHEDULER_cancel (sched, va->timeout_task);
2448 GNUNET_free (va->transport_name);
2449 if (va->chvc != NULL)
2451 va->chvc->ve_count--;
2452 if (va->chvc->ve_count == 0)
2454 GNUNET_CONTAINER_DLL_remove (chvc_head,
2457 GNUNET_free (va->chvc);
2467 * HELLO validation cleanup task (validation failed).
2469 * @param cls the 'struct ValidationEntry' that failed
2470 * @param tc scheduler context (unused)
2473 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2475 struct ValidationEntry *va = cls;
2476 struct GNUNET_PeerIdentity pid;
2478 va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2479 GNUNET_STATISTICS_update (stats,
2480 gettext_noop ("# address validation timeouts"),
2483 GNUNET_CRYPTO_hash (&va->publicKey,
2485 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2487 GNUNET_break (GNUNET_OK ==
2488 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2491 abort_validation (NULL, NULL, va);
2496 neighbour_timeout_task (void *cls,
2497 const struct GNUNET_SCHEDULER_TaskContext *tc)
2499 struct NeighbourList *n = cls;
2502 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2503 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2505 GNUNET_STATISTICS_update (stats,
2506 gettext_noop ("# disconnects due to timeout"),
2509 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2510 disconnect_neighbour (n, GNUNET_NO);
2515 * Schedule the job that will cause us to send a PING to the
2516 * foreign address to evaluate its validity and latency.
2518 * @param fal address to PING
2521 schedule_next_ping (struct ForeignAddressList *fal);
2525 * Add the given address to the list of foreign addresses
2526 * available for the given peer (check for duplicates).
2528 * @param cls the respective 'struct NeighbourList' to update
2529 * @param tname name of the transport
2530 * @param expiration expiration time
2531 * @param addr the address
2532 * @param addrlen length of the address
2533 * @return GNUNET_OK (always)
2536 add_to_foreign_address_list (void *cls,
2538 struct GNUNET_TIME_Absolute expiration,
2542 struct NeighbourList *n = cls;
2543 struct ForeignAddressList *fal;
2546 GNUNET_STATISTICS_update (stats,
2547 gettext_noop ("# valid peer addresses returned by PEERINFO"),
2551 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2555 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2556 "Adding address `%s' (%s) for peer `%4s' due to PEERINFO data for %llums.\n",
2557 a2s (tname, addr, addrlen),
2559 GNUNET_i2s (&n->id),
2562 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2565 GNUNET_STATISTICS_update (stats,
2566 gettext_noop ("# previously validated addresses lacking transport"),
2572 fal->expires = GNUNET_TIME_absolute_max (expiration,
2574 schedule_next_ping (fal);
2580 fal->expires = GNUNET_TIME_absolute_max (expiration,
2585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2586 "Failed to add new address for `%4s'\n",
2587 GNUNET_i2s (&n->id));
2590 if (fal->validated == GNUNET_NO)
2592 fal->validated = GNUNET_YES;
2593 GNUNET_STATISTICS_update (stats,
2594 gettext_noop ("# peer addresses considered valid"),
2598 if (try == GNUNET_YES)
2600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2601 "Have new addresses, will try to trigger transmissions.\n");
2602 try_transmission_to_peer (n);
2609 * Add addresses in validated HELLO "h" to the set of addresses
2610 * we have for this peer.
2612 * @param cls closure ('struct NeighbourList*')
2613 * @param peer id of the peer, NULL for last call
2614 * @param h hello message for the peer (can be NULL)
2617 add_hello_for_peer (void *cls,
2618 const struct GNUNET_PeerIdentity *peer,
2619 const struct GNUNET_HELLO_Message *h)
2621 struct NeighbourList *n = cls;
2629 return; /* no HELLO available */
2631 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2632 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2636 if (GNUNET_YES != n->public_key_valid)
2638 GNUNET_HELLO_get_key (h, &n->publicKey);
2639 n->public_key_valid = GNUNET_YES;
2641 GNUNET_HELLO_iterate_addresses (h,
2643 &add_to_foreign_address_list,
2649 * Create a fresh entry in our neighbour list for the given peer.
2650 * Will try to transmit our current HELLO to the new neighbour.
2651 * Do not call this function directly, use 'setup_peer_check_blacklist.
2653 * @param peer the peer for which we create the entry
2654 * @param do_hello should we schedule transmitting a HELLO
2655 * @return the new neighbour list entry
2657 static struct NeighbourList *
2658 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2661 struct NeighbourList *n;
2662 struct TransportPlugin *tp;
2663 struct ReadyList *rl;
2666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2667 "Setting up state for neighbour `%4s'\n",
2670 GNUNET_assert (our_hello != NULL);
2671 GNUNET_STATISTICS_update (stats,
2672 gettext_noop ("# active neighbours"),
2675 n = GNUNET_malloc (sizeof (struct NeighbourList));
2676 n->next = neighbours;
2680 GNUNET_TIME_relative_to_absolute
2681 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2682 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2683 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2684 MAX_BANDWIDTH_CARRY_S);
2688 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2690 rl = GNUNET_malloc (sizeof (struct ReadyList));
2692 rl->next = n->plugins;
2695 rl->addresses = NULL;
2699 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2701 n->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
2702 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2703 &neighbour_timeout_task, n);
2706 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2707 GNUNET_TIME_UNIT_FOREVER_REL,
2708 &add_hello_for_peer, n);
2709 transmit_to_peer (NULL, NULL, 0,
2710 HELLO_ADDRESS_EXPIRATION,
2711 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2719 * Function called after we have checked if communicating
2720 * with a given peer is acceptable.
2722 * @param cls closure
2723 * @param n NULL if communication is not acceptable
2725 typedef void (*SetupContinuation)(void *cls,
2726 struct NeighbourList *n);
2730 * Information kept for each client registered to perform
2736 * This is a linked list.
2738 struct Blacklisters *next;
2741 * This is a linked list.
2743 struct Blacklisters *prev;
2746 * Client responsible for this entry.
2748 struct GNUNET_SERVER_Client *client;
2751 * Blacklist check that we're currently performing.
2753 struct BlacklistCheck *bc;
2759 * Head of DLL of blacklisting clients.
2761 static struct Blacklisters *bl_head;
2764 * Tail of DLL of blacklisting clients.
2766 static struct Blacklisters *bl_tail;
2770 * Context we use when performing a blacklist check.
2772 struct BlacklistCheck
2776 * This is a linked list.
2778 struct BlacklistCheck *next;
2781 * This is a linked list.
2783 struct BlacklistCheck *prev;
2786 * Peer being checked.
2788 struct GNUNET_PeerIdentity peer;
2791 * Option for setup neighbour afterwards.
2796 * Continuation to call with the result.
2798 SetupContinuation cont;
2806 * Current transmission request handle for this client, or NULL if no
2807 * request is pending.
2809 struct GNUNET_CONNECTION_TransmitHandle *th;
2812 * Our current position in the blacklisters list.
2814 struct Blacklisters *bl_pos;
2817 * Current task performing the check.
2819 GNUNET_SCHEDULER_TaskIdentifier task;
2824 * Head of DLL of active blacklisting queries.
2826 static struct BlacklistCheck *bc_head;
2829 * Tail of DLL of active blacklisting queries.
2831 static struct BlacklistCheck *bc_tail;
2835 * Perform next action in the blacklist check.
2837 * @param cls the 'struct BlacklistCheck*'
2841 do_blacklist_check (void *cls,
2842 const struct GNUNET_SCHEDULER_TaskContext *tc);
2846 * Transmit blacklist query to the client.
2848 * @param cls the 'struct BlacklistCheck'
2849 * @param size number of bytes allowed
2850 * @param buf where to copy the message
2851 * @return number of bytes copied to buf
2854 transmit_blacklist_message (void *cls,
2858 struct BlacklistCheck *bc = cls;
2859 struct Blacklisters *bl;
2860 struct BlacklistMessage bm;
2865 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2866 bc->task = GNUNET_SCHEDULER_add_now (sched,
2867 &do_blacklist_check,
2872 bm.header.size = htons (sizeof (struct BlacklistMessage));
2873 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2874 bm.is_allowed = htonl (0);
2876 memcpy (buf, &bm, sizeof (bm));
2877 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2883 * Perform next action in the blacklist check.
2885 * @param cls the 'struct BlacklistCheck*'
2889 do_blacklist_check (void *cls,
2890 const struct GNUNET_SCHEDULER_TaskContext *tc)
2892 struct BlacklistCheck *bc = cls;
2893 struct Blacklisters *bl;
2895 bc->task = GNUNET_SCHEDULER_NO_TASK;
2899 bc->cont (bc->cont_cls,
2900 setup_new_neighbour (&bc->peer, bc->do_hello));
2907 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
2908 sizeof (struct BlacklistMessage),
2909 GNUNET_TIME_UNIT_FOREVER_REL,
2910 &transmit_blacklist_message,
2917 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
2918 * does not yet exist, check the blacklist. If the blacklist says creating
2919 * one is acceptable, create one and call the continuation; otherwise
2920 * call the continuation with NULL.
2922 * @param peer peer to setup or look up a struct NeighbourList for
2923 * @param do_hello should we also schedule sending our HELLO to the peer
2924 * if this is a new record
2925 * @param cont function to call with the 'struct NeigbhbourList*'
2926 * @param cont_cls closure for cont
2929 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
2931 SetupContinuation cont,
2934 struct NeighbourList *n;
2935 struct BlacklistCheck *bc;
2937 n = find_neighbour(peer);
2943 if (bl_head == NULL)
2946 setup_new_neighbour (peer, do_hello));
2949 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
2950 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
2952 bc->do_hello = do_hello;
2954 bc->cont_cls = cont_cls;
2955 bc->bl_pos = bl_head;
2956 bc->task = GNUNET_SCHEDULER_add_now (sched,
2957 &do_blacklist_check,
2963 * Function called with the result of querying a new blacklister about
2964 * it being allowed (or not) to continue to talk to an existing neighbour.
2966 * @param cls the original 'struct NeighbourList'
2967 * @param n NULL if we need to disconnect
2970 confirm_or_drop_neighbour (void *cls,
2971 struct NeighbourList *n)
2973 struct NeighbourList * orig = cls;
2976 disconnect_neighbour (orig, GNUNET_NO);
2981 * Handle a request to start a blacklist.
2983 * @param cls closure (always NULL)
2984 * @param client identification of the client
2985 * @param message the actual message
2988 handle_blacklist_init (void *cls,
2989 struct GNUNET_SERVER_Client *client,
2990 const struct GNUNET_MessageHeader *message)
2992 struct Blacklisters *bl;
2993 struct BlacklistCheck *bc;
2994 struct NeighbourList *n;
2999 if (bl->client == client)
3002 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3007 bl = GNUNET_malloc (sizeof (struct Blacklisters));
3008 bl->client = client;
3009 GNUNET_SERVER_client_keep (client);
3010 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
3011 /* confirm that all existing connections are OK! */
3015 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3016 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3018 bc->do_hello = GNUNET_NO;
3019 bc->cont = &confirm_or_drop_neighbour;
3022 if (n == neighbours) /* all would wait for the same client, no need to
3023 create more than just the first task right now */
3024 bc->task = GNUNET_SCHEDULER_add_now (sched,
3025 &do_blacklist_check,
3033 * Handle a request to blacklist a peer.
3035 * @param cls closure (always NULL)
3036 * @param client identification of the client
3037 * @param message the actual message
3040 handle_blacklist_reply (void *cls,
3041 struct GNUNET_SERVER_Client *client,
3042 const struct GNUNET_MessageHeader *message)
3044 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
3045 struct Blacklisters *bl;
3046 struct BlacklistCheck *bc;
3049 while ( (bl != NULL) &&
3050 (bl->client != client) )
3054 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3059 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
3061 bc->cont (bc->cont_cls, NULL);
3062 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
3067 bc->bl_pos = bc->bl_pos->next;
3068 bc->task = GNUNET_SCHEDULER_add_now (sched,
3069 &do_blacklist_check,
3072 /* check if any other bc's are waiting for this blacklister */
3076 if ( (bc->bl_pos == bl) &&
3077 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
3078 bc->task = GNUNET_SCHEDULER_add_now (sched,
3079 &do_blacklist_check,
3087 * Send periodic PING messages to a given foreign address.
3089 * @param cls our 'struct PeriodicValidationContext*'
3090 * @param tc task context
3093 send_periodic_ping (void *cls,
3094 const struct GNUNET_SCHEDULER_TaskContext *tc)
3096 struct ForeignAddressList *peer_address = cls;
3097 struct TransportPlugin *tp;
3098 struct ValidationEntry *va;
3099 struct NeighbourList *neighbour;
3100 struct TransportPingMessage ping;
3101 struct CheckAddressExistsClosure caec;
3103 uint16_t hello_size;
3107 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3108 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3110 tp = peer_address->ready_list->plugin;
3111 neighbour = peer_address->ready_list->neighbour;
3112 if (GNUNET_YES != neighbour->public_key_valid)
3114 /* no public key yet, try again later */
3115 schedule_next_ping (peer_address);
3118 caec.addr = peer_address->addr;
3119 caec.addrlen = peer_address->addrlen;
3120 caec.tname = tp->short_name;
3121 caec.session = peer_address->session;
3122 caec.exists = GNUNET_NO;
3123 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3124 &check_address_exists,
3126 if (caec.exists == GNUNET_YES)
3128 /* During validation attempts we will likely trigger the other
3129 peer trying to validate our address which in turn will cause
3130 it to send us its HELLO, so we expect to hit this case rather
3131 frequently. Only print something if we are very verbose. */
3132 #if DEBUG_TRANSPORT > 1
3133 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3134 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3135 (peer_address->addr != NULL)
3136 ? a2s (tp->short_name,
3138 peer_address->addrlen)
3141 GNUNET_i2s (&neighbour->id));
3143 schedule_next_ping (peer_address);
3146 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3147 va->transport_name = GNUNET_strdup (tp->short_name);
3148 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3150 va->send_time = GNUNET_TIME_absolute_get();
3151 va->session = peer_address->session;
3152 if (peer_address->addr != NULL)
3154 va->addr = (const void*) &va[1];
3155 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3156 va->addrlen = peer_address->addrlen;
3158 memcpy(&va->publicKey,
3159 &neighbour->publicKey,
3160 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3162 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3163 HELLO_VERIFICATION_TIMEOUT,
3164 &timeout_hello_validation,
3166 GNUNET_CONTAINER_multihashmap_put (validation_map,
3167 &neighbour->id.hashPubKey,
3169 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3170 hello_size = GNUNET_HELLO_size(our_hello);
3171 tsize = sizeof(struct TransportPingMessage) + hello_size;
3172 if (peer_address->addr != NULL)
3174 slen = strlen (tp->short_name) + 1;
3175 tsize += slen + peer_address->addrlen;
3179 slen = 0; /* make gcc happy */
3181 message_buf = GNUNET_malloc(tsize);
3182 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3183 ping.challenge = htonl(va->challenge);
3184 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3185 memcpy(message_buf, our_hello, hello_size);
3186 if (peer_address->addr != NULL)
3188 ping.header.size = htons(sizeof(struct TransportPingMessage) +
3189 peer_address->addrlen +
3191 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3194 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3196 peer_address->addrlen);
3200 ping.header.size = htons(sizeof(struct TransportPingMessage));
3202 memcpy(&message_buf[hello_size],
3204 sizeof(struct TransportPingMessage));
3206 #if DEBUG_TRANSPORT_REVALIDATION
3207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3208 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s'\n",
3209 (peer_address->addr != NULL)
3210 ? a2s (peer_address->plugin->short_name,
3212 peer_address->addrlen)
3215 GNUNET_i2s (&neighbour->id),
3216 "HELLO", hello_size,
3219 GNUNET_STATISTICS_update (stats,
3220 gettext_noop ("# PING messages sent for re-validation"),
3223 transmit_to_peer (NULL, peer_address,
3224 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3225 HELLO_VERIFICATION_TIMEOUT,
3227 GNUNET_YES, neighbour);
3228 GNUNET_free(message_buf);
3229 schedule_next_ping (peer_address);
3234 * Schedule the job that will cause us to send a PING to the
3235 * foreign address to evaluate its validity and latency.
3237 * @param fal address to PING
3240 schedule_next_ping (struct ForeignAddressList *fal)
3242 struct GNUNET_TIME_Relative delay;
3244 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3246 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3247 delay.value /= 2; /* do before expiration */
3248 delay = GNUNET_TIME_relative_min (delay,
3249 LATENCY_EVALUATION_MAX_DELAY);
3250 if (GNUNET_YES != fal->estimated)
3252 delay = GNUNET_TIME_UNIT_ZERO;
3253 fal->estimated = GNUNET_YES;
3255 if (GNUNET_YES == fal->connected)
3257 delay = GNUNET_TIME_relative_min (delay,
3258 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3260 /* FIXME: also adjust delay based on how close the last
3261 observed latency is to the latency of the best alternative */
3262 /* bound how fast we can go */
3263 delay = GNUNET_TIME_relative_max (delay,
3264 GNUNET_TIME_UNIT_SECONDS);
3265 /* randomize a bit (to avoid doing all at the same time) */
3266 delay.value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3267 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(sched,
3269 &send_periodic_ping,
3277 * Function that will be called if we receive some payload
3278 * from another peer.
3280 * @param message the payload
3281 * @param n peer who claimed to be the sender
3284 handle_payload_message (const struct GNUNET_MessageHeader *message,
3285 struct NeighbourList *n)
3287 struct InboundMessage *im;
3288 struct TransportClient *cpos;
3291 msize = ntohs (message->size);
3292 if (n->received_pong == GNUNET_NO)
3294 GNUNET_free_non_null (n->pre_connect_message_buffer);
3295 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3296 memcpy (n->pre_connect_message_buffer, message, msize);
3300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3301 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
3302 ntohs (message->type),
3303 ntohs (message->size),
3304 GNUNET_i2s (&n->id));
3306 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3309 n->quota_violation_count++;
3311 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3312 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3313 n->in_tracker.available_bytes_per_s__,
3314 n->quota_violation_count);
3316 /* Discount 32k per violation */
3317 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3322 if (n->quota_violation_count > 0)
3324 /* try to add 32k back */
3325 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3327 n->quota_violation_count--;
3330 GNUNET_STATISTICS_update (stats,
3331 gettext_noop ("# payload received from other peers"),
3334 /* transmit message to all clients */
3335 im = GNUNET_malloc (sizeof (struct InboundMessage) + msize);
3336 im->header.size = htons (sizeof (struct InboundMessage) + msize);
3337 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3338 im->latency = GNUNET_TIME_relative_hton (n->latency);
3340 im->distance = ntohl(n->distance);
3341 memcpy (&im[1], message, msize);
3343 while (cpos != NULL)
3345 transmit_to_client (cpos, &im->header, GNUNET_YES);
3353 * Iterator over hash map entries. Checks if the given validation
3354 * entry is for the same challenge as what is given in the PONG.
3356 * @param cls the 'struct TransportPongMessage*'
3357 * @param key peer identity
3358 * @param value value in the hash map ('struct ValidationEntry')
3359 * @return GNUNET_YES if we should continue to
3360 * iterate (mismatch), GNUNET_NO if not (entry matched)
3363 check_pending_validation (void *cls,
3364 const GNUNET_HashCode * key,
3367 const struct TransportPongMessage *pong = cls;
3368 struct ValidationEntry *ve = value;
3369 struct AddValidatedAddressContext avac;
3370 unsigned int challenge = ntohl(pong->challenge);
3371 struct GNUNET_HELLO_Message *hello;
3372 struct GNUNET_PeerIdentity target;
3373 struct NeighbourList *n;
3374 struct ForeignAddressList *fal;
3375 struct OwnAddressList *oal;
3376 struct TransportPlugin *tp;
3377 struct GNUNET_MessageHeader *prem;
3383 ps = ntohs (pong->header.size);
3384 if (ps < sizeof (struct TransportPongMessage))
3386 GNUNET_break_op (0);
3389 addr = (const char*) &pong[1];
3390 slen = strlen (ve->transport_name) + 1;
3391 if ( (ps - sizeof (struct TransportPongMessage) != ve->addrlen + slen) ||
3392 (ve->challenge != challenge) ||
3393 (addr[slen-1] != '\0') ||
3394 (0 != strcmp (addr, ve->transport_name)) ||
3395 (ntohl (pong->purpose.size)
3396 != sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3398 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3399 sizeof (struct GNUNET_PeerIdentity) + ve->addrlen + slen) )
3401 alen = ps - sizeof (struct TransportPongMessage) - slen;
3402 switch (ntohl (pong->purpose.purpose))
3404 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN:
3405 if ( (ve->addrlen + slen != ntohl (pong->addrlen)) ||
3406 (0 != memcmp (&addr[slen],
3409 return GNUNET_YES; /* different entry, keep trying! */
3410 if (0 != memcmp (&pong->pid,
3412 sizeof (struct GNUNET_PeerIdentity)))
3414 GNUNET_break_op (0);
3418 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
3423 GNUNET_break_op (0);
3427 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3428 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
3430 a2s (ve->transport_name,
3431 (const struct sockaddr *) ve->addr,
3433 ve->transport_name);
3436 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING:
3437 if (ve->addrlen != 0)
3438 return GNUNET_YES; /* different entry, keep trying */
3439 if ( (0 != memcmp (&pong->pid,
3441 sizeof (struct GNUNET_PeerIdentity))) ||
3442 (ve->addrlen != 0) )
3444 GNUNET_break_op (0);
3447 tp = find_transport (ve->transport_name);
3453 oal = tp->addresses;
3456 if ( (oal->addrlen == alen) &&
3457 (0 == memcmp (&oal[1],
3465 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3466 _("Not accepting PONG with address `%s' since I cannot confirm having this address.\n"),
3467 a2s (ve->transport_name,
3473 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING,
3478 GNUNET_break_op (0);
3482 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3483 "Confirmed that peer `%4s' is talking to us using address `%s' (%s) for us.\n",
3485 a2s (ve->transport_name,
3488 ve->transport_name);
3492 GNUNET_break_op (0);
3495 if (GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (pong->expiration)).value == 0)
3497 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3498 _("Received expired signature. Check system time.\n"));
3501 GNUNET_STATISTICS_update (stats,
3502 gettext_noop ("# address validation successes"),
3505 /* create the updated HELLO */
3506 GNUNET_CRYPTO_hash (&ve->publicKey,
3507 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3508 &target.hashPubKey);
3509 if (ve->addr != NULL)
3511 avac.done = GNUNET_NO;
3513 hello = GNUNET_HELLO_create (&ve->publicKey,
3514 &add_validated_address,
3516 GNUNET_PEERINFO_add_peer (peerinfo,
3518 GNUNET_free (hello);
3520 n = find_neighbour (&target);
3523 n->publicKey = ve->publicKey;
3524 n->public_key_valid = GNUNET_YES;
3525 fal = add_peer_address (n,
3530 GNUNET_assert (fal != NULL);
3531 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
3532 fal->validated = GNUNET_YES;
3533 mark_address_connected (fal);
3534 GNUNET_STATISTICS_update (stats,
3535 gettext_noop ("# peer addresses considered valid"),
3538 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
3539 schedule_next_ping (fal);
3540 if (n->latency.value == GNUNET_TIME_UNIT_FOREVER_REL.value)
3541 n->latency = fal->latency;
3543 n->latency.value = (fal->latency.value + n->latency.value) / 2;
3545 n->distance = fal->distance;
3546 if (GNUNET_NO == n->received_pong)
3548 n->received_pong = GNUNET_YES;
3549 notify_clients_connect (&target, n->latency, n->distance);
3550 if (NULL != (prem = n->pre_connect_message_buffer))
3552 n->pre_connect_message_buffer = NULL;
3553 handle_payload_message (prem, n);
3557 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3559 GNUNET_SCHEDULER_cancel (sched,
3561 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3562 try_transmission_to_peer (n);
3566 /* clean up validation entry */
3567 GNUNET_assert (GNUNET_YES ==
3568 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3571 abort_validation (NULL, NULL, ve);
3577 * Function that will be called if we receive a validation
3578 * of an address challenge that we transmitted to another
3579 * peer. Note that the validation should only be considered
3580 * acceptable if the challenge matches AND if the sender
3581 * address is at least a plausible address for this peer
3582 * (otherwise we may be seeing a MiM attack).
3584 * @param cls closure
3585 * @param message the pong message
3586 * @param peer who responded to our challenge
3587 * @param sender_address string describing our sender address (as observed
3588 * by the other peer in binary format)
3589 * @param sender_address_len number of bytes in 'sender_address'
3592 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3593 const struct GNUNET_PeerIdentity *peer,
3594 const char *sender_address,
3595 size_t sender_address_len)
3597 #if DEBUG_TRANSPORT > 1
3598 /* we get tons of these that just get discarded, only log
3599 if we are quite verbose */
3600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3601 "Receiving `%s' message from `%4s'.\n", "PONG",
3604 GNUNET_STATISTICS_update (stats,
3605 gettext_noop ("# PONG messages received"),
3608 if (GNUNET_SYSERR !=
3609 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3611 &check_pending_validation,
3614 /* This is *expected* to happen a lot since we send
3615 PONGs to *all* known addresses of the sender of
3616 the PING, so most likely we get multiple PONGs
3617 per PING, and all but the first PONG will end up
3618 here. So really we should not print anything here
3619 unless we want to be very, very verbose... */
3620 #if DEBUG_TRANSPORT > 2
3621 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3622 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3634 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3636 * @param cls the 'struct ValidationEntry*'
3637 * @param neighbour neighbour to validate, NULL if validation failed
3640 transmit_hello_and_ping (void *cls,
3641 struct NeighbourList *neighbour)
3643 struct ValidationEntry *va = cls;
3644 struct ForeignAddressList *peer_address;
3645 struct TransportPingMessage ping;
3646 uint16_t hello_size;
3649 struct GNUNET_PeerIdentity id;
3652 GNUNET_CRYPTO_hash (&va->publicKey,
3653 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3655 if (neighbour == NULL)
3657 /* FIXME: stats... */
3658 GNUNET_break (GNUNET_OK ==
3659 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3662 abort_validation (NULL, NULL, va);
3665 neighbour->publicKey = va->publicKey;
3666 neighbour->public_key_valid = GNUNET_YES;
3667 peer_address = add_peer_address (neighbour,
3668 va->transport_name, NULL,
3669 (const void*) &va[1],
3671 if (peer_address == NULL)
3673 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3674 "Failed to add peer `%4s' for plugin `%s'\n",
3675 GNUNET_i2s (&neighbour->id),
3676 va->transport_name);
3677 GNUNET_break (GNUNET_OK ==
3678 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3681 abort_validation (NULL, NULL, va);
3684 hello_size = GNUNET_HELLO_size(our_hello);
3685 slen = strlen(va->transport_name) + 1;
3686 tsize = sizeof(struct TransportPingMessage) + hello_size + va->addrlen + slen;
3687 message_buf = GNUNET_malloc(tsize);
3688 ping.challenge = htonl(va->challenge);
3689 ping.header.size = htons(sizeof(struct TransportPingMessage) + slen + va->addrlen);
3690 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3691 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3692 memcpy(message_buf, our_hello, hello_size);
3693 memcpy(&message_buf[hello_size],
3695 sizeof(struct TransportPingMessage));
3696 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3699 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3704 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3707 : a2s (va->transport_name,
3708 (const void*) &va[1], va->addrlen),
3710 GNUNET_i2s (&neighbour->id),
3711 "HELLO", hello_size,
3712 "PING", sizeof (struct TransportPingMessage) + va->addrlen + slen);
3715 GNUNET_STATISTICS_update (stats,
3716 gettext_noop ("# PING messages sent for initial validation"),
3719 transmit_to_peer (NULL, peer_address,
3720 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3721 HELLO_VERIFICATION_TIMEOUT,
3723 GNUNET_YES, neighbour);
3724 GNUNET_free(message_buf);
3729 * Check if the given address is already being validated; if not,
3730 * append the given address to the list of entries that are being be
3731 * validated and initiate validation.
3733 * @param cls closure ('struct CheckHelloValidatedContext *')
3734 * @param tname name of the transport
3735 * @param expiration expiration time
3736 * @param addr the address
3737 * @param addrlen length of the address
3738 * @return GNUNET_OK (always)
3741 run_validation (void *cls,
3743 struct GNUNET_TIME_Absolute expiration,
3747 struct CheckHelloValidatedContext *chvc = cls;
3748 struct GNUNET_PeerIdentity id;
3749 struct TransportPlugin *tp;
3750 struct ValidationEntry *va;
3751 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3752 struct CheckAddressExistsClosure caec;
3753 struct OwnAddressList *oal;
3755 GNUNET_assert (addr != NULL);
3757 GNUNET_STATISTICS_update (stats,
3758 gettext_noop ("# peer addresses scheduled for validation"),
3761 tp = find_transport (tname);
3764 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3765 GNUNET_ERROR_TYPE_BULK,
3767 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3769 GNUNET_STATISTICS_update (stats,
3770 gettext_noop ("# peer addresses not validated (plugin not available)"),
3775 /* check if this is one of our own addresses */
3776 oal = tp->addresses;
3779 if ( (oal->addrlen == addrlen) &&
3780 (0 == memcmp (&oal[1],
3784 /* not plausible, this address is equivalent to our own address! */
3785 GNUNET_STATISTICS_update (stats,
3786 gettext_noop ("# peer addresses not validated (loopback)"),
3793 GNUNET_HELLO_get_key (chvc->hello, &pk);
3794 GNUNET_CRYPTO_hash (&pk,
3796 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3799 if (is_blacklisted(&id, tp))
3802 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3803 "Attempted to validate blacklisted peer `%s' using `%s'!\n",
3811 caec.addrlen = addrlen;
3812 caec.session = NULL;
3814 caec.exists = GNUNET_NO;
3815 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3816 &check_address_exists,
3818 if (caec.exists == GNUNET_YES)
3820 /* During validation attempts we will likely trigger the other
3821 peer trying to validate our address which in turn will cause
3822 it to send us its HELLO, so we expect to hit this case rather
3823 frequently. Only print something if we are very verbose. */
3824 #if DEBUG_TRANSPORT > 1
3825 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3826 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3827 a2s (tname, addr, addrlen),
3831 GNUNET_STATISTICS_update (stats,
3832 gettext_noop ("# peer addresses not validated (in progress)"),
3837 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
3840 va->transport_name = GNUNET_strdup (tname);
3841 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3843 va->send_time = GNUNET_TIME_absolute_get();
3844 va->addr = (const void*) &va[1];
3845 memcpy (&va[1], addr, addrlen);
3846 va->addrlen = addrlen;
3847 GNUNET_HELLO_get_key (chvc->hello,
3849 va->timeout_task = GNUNET_SCHEDULER_add_delayed (sched,
3850 HELLO_VERIFICATION_TIMEOUT,
3851 &timeout_hello_validation,
3853 GNUNET_CONTAINER_multihashmap_put (validation_map,
3856 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3857 setup_peer_check_blacklist (&id, GNUNET_NO,
3858 &transmit_hello_and_ping,
3865 * Check if addresses in validated hello "h" overlap with
3866 * those in "chvc->hello" and validate the rest.
3868 * @param cls closure
3869 * @param peer id of the peer, NULL for last call
3870 * @param h hello message for the peer (can be NULL)
3873 check_hello_validated (void *cls,
3874 const struct GNUNET_PeerIdentity *peer,
3875 const struct GNUNET_HELLO_Message *h)
3877 struct CheckHelloValidatedContext *chvc = cls;
3878 struct GNUNET_HELLO_Message *plain_hello;
3879 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3880 struct GNUNET_PeerIdentity target;
3881 struct NeighbourList *n;
3886 if (GNUNET_NO == chvc->hello_known)
3888 /* notify PEERINFO about the peer now, so that we at least
3889 have the public key if some other component needs it */
3890 GNUNET_HELLO_get_key (chvc->hello, &pk);
3891 GNUNET_CRYPTO_hash (&pk,
3892 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3893 &target.hashPubKey);
3894 plain_hello = GNUNET_HELLO_create (&pk,
3897 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
3898 GNUNET_free (plain_hello);
3900 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3901 "PEERINFO had no `%s' message for peer `%4s', full validation needed.\n",
3903 GNUNET_i2s (&target));
3905 GNUNET_STATISTICS_update (stats,
3906 gettext_noop ("# new HELLOs requiring full validation"),
3909 GNUNET_HELLO_iterate_addresses (chvc->hello,
3916 GNUNET_STATISTICS_update (stats,
3917 gettext_noop ("# duplicate HELLO (peer known)"),
3922 if (chvc->ve_count == 0)
3924 GNUNET_CONTAINER_DLL_remove (chvc_head,
3934 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3935 "PEERINFO had `%s' message for peer `%4s', validating only new addresses.\n",
3939 chvc->hello_known = GNUNET_YES;
3940 n = find_neighbour (peer);
3943 GNUNET_HELLO_iterate_addresses (h,
3945 &add_to_foreign_address_list,
3947 try_transmission_to_peer (n);
3951 GNUNET_STATISTICS_update (stats,
3952 gettext_noop ("# no existing neighbour record (validating HELLO)"),
3956 GNUNET_STATISTICS_update (stats,
3957 gettext_noop ("# HELLO validations (update case)"),
3960 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
3962 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
3969 * Process HELLO-message.
3971 * @param plugin transport involved, may be NULL
3972 * @param message the actual message
3973 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
3976 process_hello (struct TransportPlugin *plugin,
3977 const struct GNUNET_MessageHeader *message)
3980 struct GNUNET_PeerIdentity target;
3981 const struct GNUNET_HELLO_Message *hello;
3982 struct CheckHelloValidatedContext *chvc;
3983 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
3984 #if DEBUG_TRANSPORT_HELLO
3987 hsize = ntohs (message->size);
3988 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
3989 (hsize < sizeof (struct GNUNET_MessageHeader)))
3992 return GNUNET_SYSERR;
3994 GNUNET_STATISTICS_update (stats,
3995 gettext_noop ("# HELLOs received for validation"),
3999 /* first, check if load is too high */
4000 if (GNUNET_SCHEDULER_get_load (sched,
4001 GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
4003 GNUNET_STATISTICS_update (stats,
4004 gettext_noop ("# HELLOs ignored due to high load"),
4007 #if DEBUG_TRANSPORT_HELLO
4008 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4009 "Ignoring `%s' for `%4s', load too high.\n",
4011 GNUNET_i2s (&target));
4015 hello = (const struct GNUNET_HELLO_Message *) message;
4016 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
4018 #if DEBUG_TRANSPORT_HELLO
4019 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4020 "Unable to get public key from `%s' for `%4s'!\n",
4022 GNUNET_i2s (&target));
4024 GNUNET_break_op (0);
4025 return GNUNET_SYSERR;
4028 GNUNET_CRYPTO_hash (&publicKey,
4029 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4030 &target.hashPubKey);
4032 if (0 == memcmp (&my_identity,
4034 sizeof (struct GNUNET_PeerIdentity)))
4036 GNUNET_STATISTICS_update (stats,
4037 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
4043 while (NULL != chvc)
4045 if (GNUNET_HELLO_equals (hello,
4047 GNUNET_TIME_absolute_get ()).value > 0)
4049 #if DEBUG_TRANSPORT_HELLO
4050 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4051 "Received duplicate `%s' message for `%4s'; ignored\n",
4053 GNUNET_i2s (&target));
4055 return GNUNET_OK; /* validation already pending */
4057 if (GNUNET_HELLO_size(hello) == GNUNET_HELLO_size (chvc->hello))
4058 GNUNET_break (0 != memcmp (hello, chvc->hello,
4059 GNUNET_HELLO_size(hello)));
4062 #if DEBUG_TRANSPORT_HELLO
4065 my_id = GNUNET_strdup(GNUNET_i2s(plugin->env.my_identity));
4066 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4067 "%s: Starting validation of `%s' message for `%4s' via '%s' of size %u\n",
4070 GNUNET_i2s (&target),
4072 GNUNET_HELLO_size(hello));
4076 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
4078 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
4079 memcpy (&chvc[1], hello, hsize);
4080 GNUNET_CONTAINER_DLL_insert (chvc_head,
4083 /* finally, check if HELLO was previously validated
4084 (continuation will then schedule actual validation) */
4085 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
4087 HELLO_VERIFICATION_TIMEOUT,
4088 &check_hello_validated, chvc);
4094 * The peer specified by the given neighbour has timed-out or a plugin
4095 * has disconnected. We may either need to do nothing (other plugins
4096 * still up), or trigger a full disconnect and clean up. This
4097 * function updates our state and does the necessary notifications.
4098 * Also notifies our clients that the neighbour is now officially
4101 * @param n the neighbour list entry for the peer
4102 * @param check should we just check if all plugins
4103 * disconnected or must we ask all plugins to
4107 disconnect_neighbour (struct NeighbourList *n, int check)
4109 struct ReadyList *rpos;
4110 struct NeighbourList *npos;
4111 struct NeighbourList *nprev;
4112 struct MessageQueue *mq;
4113 struct ForeignAddressList *peer_addresses;
4114 struct ForeignAddressList *peer_pos;
4116 if (GNUNET_YES == check)
4119 while (NULL != rpos)
4121 peer_addresses = rpos->addresses;
4122 while (peer_addresses != NULL)
4124 if (GNUNET_YES == peer_addresses->connected)
4125 return; /* still connected */
4126 peer_addresses = peer_addresses->next;
4132 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4133 "Disconnecting from `%4s'\n",
4134 GNUNET_i2s (&n->id));
4136 /* remove n from neighbours list */
4139 while ((npos != NULL) && (npos != n))
4144 GNUNET_assert (npos != NULL);
4146 neighbours = n->next;
4148 nprev->next = n->next;
4150 /* notify all clients about disconnect */
4151 if (GNUNET_YES == n->received_pong)
4152 notify_clients_disconnect (&n->id);
4154 /* clean up all plugins, cancel connections and pending transmissions */
4155 while (NULL != (rpos = n->plugins))
4157 n->plugins = rpos->next;
4158 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
4159 while (rpos->addresses != NULL)
4161 peer_pos = rpos->addresses;
4162 rpos->addresses = peer_pos->next;
4163 if (peer_pos->connected == GNUNET_YES)
4164 GNUNET_STATISTICS_update (stats,
4165 gettext_noop ("# connected addresses"),
4168 if (GNUNET_YES == peer_pos->validated)
4169 GNUNET_STATISTICS_update (stats,
4170 gettext_noop ("# peer addresses considered valid"),
4173 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
4175 GNUNET_SCHEDULER_cancel (sched,
4176 peer_pos->revalidate_task);
4177 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
4179 GNUNET_free(peer_pos);
4184 /* free all messages on the queue */
4185 while (NULL != (mq = n->messages_head))
4187 GNUNET_STATISTICS_update (stats,
4188 gettext_noop ("# bytes in message queue for other peers"),
4189 - (int64_t) mq->message_buf_size,
4191 GNUNET_STATISTICS_update (stats,
4192 gettext_noop ("# bytes discarded due to disconnect"),
4193 mq->message_buf_size,
4195 GNUNET_CONTAINER_DLL_remove (n->messages_head,
4198 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
4200 sizeof(struct GNUNET_PeerIdentity)));
4203 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
4205 GNUNET_SCHEDULER_cancel (sched, n->timeout_task);
4206 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
4208 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
4210 GNUNET_SCHEDULER_cancel (sched, n->retry_task);
4211 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
4213 if (n->piter != NULL)
4215 GNUNET_PEERINFO_iterate_cancel (n->piter);
4218 /* finally, free n itself */
4219 GNUNET_STATISTICS_update (stats,
4220 gettext_noop ("# active neighbours"),
4223 GNUNET_free_non_null (n->pre_connect_message_buffer);
4229 * We have received a PING message from someone. Need to send a PONG message
4230 * in response to the peer by any means necessary.
4233 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
4234 const struct GNUNET_PeerIdentity *peer,
4235 struct Session *session,
4236 const char *sender_address,
4237 uint16_t sender_address_len)
4239 struct TransportPlugin *plugin = cls;
4240 struct SessionHeader *session_header = (struct SessionHeader*) session;
4241 struct TransportPingMessage *ping;
4242 struct TransportPongMessage *pong;
4243 struct NeighbourList *n;
4244 struct ReadyList *rl;
4245 struct ForeignAddressList *fal;
4246 struct OwnAddressList *oal;
4251 if (ntohs (message->size) < sizeof (struct TransportPingMessage))
4253 GNUNET_break_op (0);
4254 return GNUNET_SYSERR;
4257 ping = (struct TransportPingMessage *) message;
4258 if (0 != memcmp (&ping->target,
4259 plugin->env.my_identity,
4260 sizeof (struct GNUNET_PeerIdentity)))
4262 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4263 _("Received `%s' message not destined for me!\n"),
4265 return GNUNET_SYSERR;
4268 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4269 "Processing `%s' from `%s'\n",
4271 (sender_address != NULL)
4272 ? a2s (plugin->short_name,
4273 (const struct sockaddr *)sender_address,
4277 GNUNET_STATISTICS_update (stats,
4278 gettext_noop ("# PING messages received"),
4281 addr = (const char*) &ping[1];
4282 alen = ntohs (message->size) - sizeof (struct TransportPingMessage);
4283 slen = strlen (plugin->short_name) + 1;
4286 /* peer wants to confirm that we have an outbound connection to him */
4287 if (session == NULL)
4289 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4290 _("Refusing to create PONG since I do not have a session with `%s'.\n"),
4292 return GNUNET_SYSERR;
4294 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4295 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4296 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4297 pong->purpose.size =
4298 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4300 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4301 sizeof (struct GNUNET_PeerIdentity) + sender_address_len + slen);
4302 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING);
4303 pong->challenge = ping->challenge;
4304 pong->addrlen = htonl(sender_address_len + slen);
4307 sizeof(struct GNUNET_PeerIdentity));
4311 memcpy (&((char*)&pong[1])[slen],
4313 sender_address_len);
4314 if (GNUNET_TIME_absolute_get_remaining (session_header->pong_sig_expires).value < PONG_SIGNATURE_LIFETIME.value / 4)
4316 /* create / update cached sig */
4318 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4319 "Creating PONG signature to indicate active connection.\n");
4321 session_header->pong_sig_expires = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
4322 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4323 GNUNET_assert (GNUNET_OK ==
4324 GNUNET_CRYPTO_rsa_sign (my_private_key,
4326 &session_header->pong_signature));
4330 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4332 memcpy (&pong->signature,
4333 &session_header->pong_signature,
4334 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4340 /* peer wants to confirm that this is one of our addresses */
4344 plugin->api->check_address (plugin->api->cls,
4348 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4349 _("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
4350 a2s (plugin->short_name,
4355 oal = plugin->addresses;
4358 if ( (oal->addrlen == alen) &&
4365 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
4366 pong->header.size = htons (sizeof (struct TransportPongMessage) + alen + slen);
4367 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4368 pong->purpose.size =
4369 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4371 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4372 sizeof (struct GNUNET_PeerIdentity) + alen + slen);
4373 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
4374 pong->challenge = ping->challenge;
4375 pong->addrlen = htonl(alen + slen);
4378 sizeof(struct GNUNET_PeerIdentity));
4379 memcpy (&pong[1], plugin->short_name, slen);
4380 memcpy (&((char*)&pong[1])[slen], addr, alen);
4381 if ( (oal != NULL) &&
4382 (GNUNET_TIME_absolute_get_remaining (oal->pong_sig_expires).value < PONG_SIGNATURE_LIFETIME.value / 4) )
4384 /* create / update cached sig */
4386 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4387 "Creating PONG signature to indicate ownership.\n");
4389 oal->pong_sig_expires = GNUNET_TIME_absolute_min (oal->expires,
4390 GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4391 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4392 GNUNET_assert (GNUNET_OK ==
4393 GNUNET_CRYPTO_rsa_sign (my_private_key,
4395 &oal->pong_signature));
4396 memcpy (&pong->signature,
4397 &oal->pong_signature,
4398 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4400 else if (oal == NULL)
4402 /* not using cache (typically DV-only) */
4403 pong->expiration = GNUNET_TIME_absolute_hton (GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4404 GNUNET_assert (GNUNET_OK ==
4405 GNUNET_CRYPTO_rsa_sign (my_private_key,
4411 /* can used cached version */
4412 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4413 memcpy (&pong->signature,
4414 &oal->pong_signature,
4415 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4418 n = find_neighbour(peer);
4419 GNUNET_assert (n != NULL);
4420 /* first try reliable response transmission */
4424 fal = rl->addresses;
4427 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4430 ntohs (pong->header.size),
4431 TRANSPORT_PONG_PRIORITY,
4432 HELLO_VERIFICATION_TIMEOUT,
4440 GNUNET_STATISTICS_update (stats,
4441 gettext_noop ("# PONGs unicast via reliable transport"),
4451 /* no reliable method found, do multicast */
4452 GNUNET_STATISTICS_update (stats,
4453 gettext_noop ("# PONGs multicast to all available addresses"),
4459 fal = rl->addresses;
4462 transmit_to_peer(NULL, fal,
4463 TRANSPORT_PONG_PRIORITY,
4464 HELLO_VERIFICATION_TIMEOUT,
4466 ntohs(pong->header.size),
4479 * Function called by the plugin for each received message.
4480 * Update data volumes, possibly notify plugins about
4481 * reducing the rate at which they read from the socket
4482 * and generally forward to our receive callback.
4484 * @param cls the "struct TransportPlugin *" we gave to the plugin
4485 * @param peer (claimed) identity of the other peer
4486 * @param message the message, NULL if we only care about
4487 * learning about the delay until we should receive again
4488 * @param distance in overlay hops; use 1 unless DV (or 0 if message == NULL)
4489 * @param session identifier used for this session (can be NULL)
4490 * @param sender_address binary address of the sender (if observed)
4491 * @param sender_address_len number of bytes in sender_address
4492 * @return how long the plugin should wait until receiving more data
4493 * (plugins that do not support this, can ignore the return value)
4495 static struct GNUNET_TIME_Relative
4496 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4497 const struct GNUNET_MessageHeader *message,
4499 struct Session *session,
4500 const char *sender_address,
4501 uint16_t sender_address_len)
4503 struct TransportPlugin *plugin = cls;
4504 struct ReadyList *service_context;
4505 struct ForeignAddressList *peer_address;
4507 struct NeighbourList *n;
4508 struct GNUNET_TIME_Relative ret;
4510 if (is_blacklisted (peer, plugin))
4511 return GNUNET_TIME_UNIT_FOREVER_REL;
4513 n = find_neighbour (peer);
4515 n = setup_new_neighbour (peer, GNUNET_YES);
4516 service_context = n->plugins;
4517 while ((service_context != NULL) && (plugin != service_context->plugin))
4518 service_context = service_context->next;
4519 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4520 peer_address = NULL;
4521 if (message != NULL)
4523 if ( (session != NULL) ||
4524 (sender_address != NULL) )
4525 peer_address = add_peer_address (n,
4529 sender_address_len);
4530 if (peer_address != NULL)
4532 peer_address->distance = distance;
4533 if (GNUNET_YES == peer_address->validated)
4534 mark_address_connected (peer_address);
4535 peer_address->timeout
4537 GNUNET_TIME_relative_to_absolute
4538 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4539 schedule_next_ping (peer_address);
4541 /* update traffic received amount ... */
4542 msize = ntohs (message->size);
4543 GNUNET_STATISTICS_update (stats,
4544 gettext_noop ("# bytes received from other peers"),
4547 n->distance = distance;
4549 GNUNET_TIME_relative_to_absolute
4550 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4551 GNUNET_SCHEDULER_cancel (sched,
4554 GNUNET_SCHEDULER_add_delayed (sched,
4555 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4556 &neighbour_timeout_task, n);
4557 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4559 /* dropping message due to frequent inbound volume violations! */
4560 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4561 GNUNET_ERROR_TYPE_BULK,
4563 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4564 n->in_tracker.available_bytes_per_s__,
4565 n->quota_violation_count);
4566 GNUNET_STATISTICS_update (stats,
4567 gettext_noop ("# bandwidth quota violations by other peers"),
4570 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4574 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
4575 ntohs (message->type),
4576 ntohs (message->size),
4579 switch (ntohs (message->type))
4581 case GNUNET_MESSAGE_TYPE_HELLO:
4582 GNUNET_STATISTICS_update (stats,
4583 gettext_noop ("# HELLO messages received from other peers"),
4586 process_hello (plugin, message);
4588 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4589 handle_ping (plugin, message, peer, session, sender_address, sender_address_len);
4591 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4592 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4595 handle_payload_message (message, n);
4599 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4602 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4603 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4604 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4605 (unsigned int) n->in_tracker.available_bytes_per_s__,
4606 (unsigned long long) ret.value);
4607 GNUNET_STATISTICS_update (stats,
4608 gettext_noop ("# ms throttling suggested"),
4609 (int64_t) ret.value,
4616 * Handle START-message. This is the first message sent to us
4617 * by any client which causes us to add it to our list.
4619 * @param cls closure (always NULL)
4620 * @param client identification of the client
4621 * @param message the actual message
4624 handle_start (void *cls,
4625 struct GNUNET_SERVER_Client *client,
4626 const struct GNUNET_MessageHeader *message)
4628 struct TransportClient *c;
4629 struct ConnectInfoMessage cim;
4630 struct NeighbourList *n;
4633 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4634 "Received `%s' request from client\n", "START");
4639 if (c->client == client)
4641 /* client already on our list! */
4643 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4648 c = GNUNET_malloc (sizeof (struct TransportClient));
4652 if (our_hello != NULL)
4655 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4656 "Sending our own `%s' to new client\n", "HELLO");
4658 transmit_to_client (c,
4659 (const struct GNUNET_MessageHeader *) our_hello,
4661 /* tell new client about all existing connections */
4662 cim.header.size = htons (sizeof (struct ConnectInfoMessage));
4663 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4667 if (GNUNET_YES == n->received_pong)
4670 cim.latency = GNUNET_TIME_relative_hton (n->latency);
4671 cim.distance = htonl (n->distance);
4672 transmit_to_client (c, &cim.header, GNUNET_NO);
4677 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4682 * Handle HELLO-message.
4684 * @param cls closure (always NULL)
4685 * @param client identification of the client
4686 * @param message the actual message
4689 handle_hello (void *cls,
4690 struct GNUNET_SERVER_Client *client,
4691 const struct GNUNET_MessageHeader *message)
4695 GNUNET_STATISTICS_update (stats,
4696 gettext_noop ("# HELLOs received from clients"),
4699 ret = process_hello (NULL, message);
4700 GNUNET_SERVER_receive_done (client, ret);
4705 * Closure for 'transmit_client_message'; followed by
4706 * 'msize' bytes of the actual message.
4708 struct TransmitClientMessageContext
4711 * Client on whom's behalf we are sending.
4713 struct GNUNET_SERVER_Client *client;
4716 * Timeout for the transmission.
4718 struct GNUNET_TIME_Absolute timeout;
4726 * Size of the message in bytes.
4733 * Schedule transmission of a message we got from a client to a peer.
4735 * @param cls the 'struct TransmitClientMessageContext*'
4736 * @param n destination, or NULL on error (in that case, drop the message)
4739 transmit_client_message (void *cls,
4740 struct NeighbourList *n)
4742 struct TransmitClientMessageContext *tcmc = cls;
4743 struct TransportClient *tc;
4746 while ((tc != NULL) && (tc->client != tcmc->client))
4751 transmit_to_peer (tc, NULL, tcmc->priority,
4752 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
4754 tcmc->msize, GNUNET_NO, n);
4756 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
4757 GNUNET_SERVER_client_drop (tcmc->client);
4763 * Handle SEND-message.
4765 * @param cls closure (always NULL)
4766 * @param client identification of the client
4767 * @param message the actual message
4770 handle_send (void *cls,
4771 struct GNUNET_SERVER_Client *client,
4772 const struct GNUNET_MessageHeader *message)
4774 const struct OutboundMessage *obm;
4775 const struct GNUNET_MessageHeader *obmm;
4776 struct TransmitClientMessageContext *tcmc;
4780 size = ntohs (message->size);
4782 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
4785 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4788 GNUNET_STATISTICS_update (stats,
4789 gettext_noop ("# payload received for other peers"),
4792 obm = (const struct OutboundMessage *) message;
4793 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
4794 msize = size - sizeof (struct OutboundMessage);
4796 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4797 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
4798 "SEND", GNUNET_i2s (&obm->peer),
4802 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
4803 tcmc->client = client;
4804 tcmc->priority = ntohl (obm->priority);
4805 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
4806 tcmc->msize = msize;
4807 /* FIXME: this memcpy can be up to 7% of our total runtime */
4808 memcpy (&tcmc[1], obmm, msize);
4809 GNUNET_SERVER_client_keep (client);
4810 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
4811 &transmit_client_message,
4817 * Handle SET_QUOTA-message.
4819 * @param cls closure (always NULL)
4820 * @param client identification of the client
4821 * @param message the actual message
4824 handle_set_quota (void *cls,
4825 struct GNUNET_SERVER_Client *client,
4826 const struct GNUNET_MessageHeader *message)
4828 const struct QuotaSetMessage *qsm =
4829 (const struct QuotaSetMessage *) message;
4830 struct NeighbourList *n;
4832 GNUNET_STATISTICS_update (stats,
4833 gettext_noop ("# SET QUOTA messages received"),
4836 n = find_neighbour (&qsm->peer);
4839 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4840 GNUNET_STATISTICS_update (stats,
4841 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
4847 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4848 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
4850 (unsigned int) ntohl (qsm->quota.value__),
4851 (unsigned int) n->in_tracker.available_bytes_per_s__,
4852 GNUNET_i2s (&qsm->peer));
4854 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
4856 if (0 == ntohl (qsm->quota.value__))
4857 disconnect_neighbour (n, GNUNET_NO);
4858 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4863 * Take the given address and append it to the set of results sent back to
4866 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
4867 * @param address the resolved name, NULL to indicate the last response
4870 transmit_address_to_client (void *cls, const char *address)
4872 struct GNUNET_SERVER_TransmitContext *tc = cls;
4875 if (NULL == address)
4878 slen = strlen (address) + 1;
4880 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
4881 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
4882 if (NULL == address)
4883 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
4888 * Handle AddressLookup-message.
4890 * @param cls closure (always NULL)
4891 * @param client identification of the client
4892 * @param message the actual message
4895 handle_address_lookup (void *cls,
4896 struct GNUNET_SERVER_Client *client,
4897 const struct GNUNET_MessageHeader *message)
4899 const struct AddressLookupMessage *alum;
4900 struct TransportPlugin *lsPlugin;
4901 const char *nameTransport;
4902 const char *address;
4904 struct GNUNET_SERVER_TransmitContext *tc;
4905 struct GNUNET_TIME_Absolute timeout;
4906 struct GNUNET_TIME_Relative rtimeout;
4909 size = ntohs (message->size);
4910 if (size < sizeof (struct AddressLookupMessage))
4912 GNUNET_break_op (0);
4913 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4916 alum = (const struct AddressLookupMessage *) message;
4917 uint32_t addressLen = ntohl (alum->addrlen);
4918 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
4920 GNUNET_break_op (0);
4921 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4924 address = (const char *) &alum[1];
4925 nameTransport = (const char *) &address[addressLen];
4927 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
4929 GNUNET_break_op (0);
4930 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4933 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
4934 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
4935 numeric = ntohl (alum->numeric_only);
4936 lsPlugin = find_transport (nameTransport);
4937 if (NULL == lsPlugin)
4939 tc = GNUNET_SERVER_transmit_context_create (client);
4940 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
4941 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
4942 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
4945 tc = GNUNET_SERVER_transmit_context_create (client);
4946 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
4948 address, addressLen,
4951 &transmit_address_to_client, tc);
4956 * Setup the environment for this plugin.
4959 create_environment (struct TransportPlugin *plug)
4961 plug->env.cfg = cfg;
4962 plug->env.sched = sched;
4963 plug->env.my_identity = &my_identity;
4964 plug->env.cls = plug;
4965 plug->env.receive = &plugin_env_receive;
4966 plug->env.notify_address = &plugin_env_notify_address;
4967 plug->env.session_end = &plugin_env_session_end;
4968 plug->env.max_connections = max_connect_per_transport;
4969 plug->env.stats = stats;
4974 * Start the specified transport (load the plugin).
4977 start_transport (struct GNUNET_SERVER_Handle *server,
4980 struct TransportPlugin *plug;
4983 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4984 _("Loading `%s' transport plugin\n"), name);
4985 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
4986 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
4987 create_environment (plug);
4988 plug->short_name = GNUNET_strdup (name);
4989 plug->lib_name = libname;
4990 plug->next = plugins;
4992 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
4993 if (plug->api == NULL)
4995 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4996 _("Failed to load transport plugin for `%s'\n"), name);
4997 GNUNET_free (plug->short_name);
4998 plugins = plug->next;
4999 GNUNET_free (libname);
5006 * Called whenever a client is disconnected. Frees our
5007 * resources associated with that client.
5009 * @param cls closure
5010 * @param client identification of the client
5013 client_disconnect_notification (void *cls,
5014 struct GNUNET_SERVER_Client *client)
5016 struct TransportClient *pos;
5017 struct TransportClient *prev;
5018 struct ClientMessageQueueEntry *mqe;
5019 struct Blacklisters *bl;
5020 struct BlacklistCheck *bc;
5025 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
5026 "Client disconnected, cleaning up.\n");
5028 /* clean up blacklister */
5032 if (bl->client == client)
5037 if (bc->bl_pos == bl)
5039 bc->bl_pos = bl->next;
5042 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
5045 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
5046 bc->task = GNUNET_SCHEDULER_add_now (sched,
5047 &do_blacklist_check,
5053 GNUNET_CONTAINER_DLL_remove (bl_head,
5056 GNUNET_SERVER_client_drop (bl->client);
5062 /* clean up 'normal' clients */
5065 while ((pos != NULL) && (pos->client != client))
5072 while (NULL != (mqe = pos->message_queue_head))
5074 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
5075 pos->message_queue_tail,
5077 pos->message_count--;
5081 clients = pos->next;
5083 prev->next = pos->next;
5084 if (GNUNET_YES == pos->tcs_pending)
5089 if (pos->th != NULL)
5091 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
5094 GNUNET_break (0 == pos->message_count);
5100 * Function called when the service shuts down. Unloads our plugins
5101 * and cancels pending validations.
5103 * @param cls closure, unused
5104 * @param tc task context (unused)
5107 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5109 struct TransportPlugin *plug;
5110 struct OwnAddressList *al;
5111 struct CheckHelloValidatedContext *chvc;
5113 while (neighbours != NULL)
5114 disconnect_neighbour (neighbours, GNUNET_NO);
5116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5117 "Transport service is unloading plugins...\n");
5119 while (NULL != (plug = plugins))
5121 plugins = plug->next;
5122 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
5124 GNUNET_SCHEDULER_cancel (plug->env.sched,
5125 plug->address_update_task);
5126 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
5128 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
5129 GNUNET_free (plug->lib_name);
5130 GNUNET_free (plug->short_name);
5131 while (NULL != (al = plug->addresses))
5133 plug->addresses = al->next;
5138 if (my_private_key != NULL)
5139 GNUNET_CRYPTO_rsa_key_free (my_private_key);
5140 GNUNET_free_non_null (our_hello);
5142 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
5145 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5146 validation_map = NULL;
5148 /* free 'chvc' data structure */
5149 while (NULL != (chvc = chvc_head))
5151 chvc_head = chvc->next;
5152 if (chvc->piter != NULL)
5153 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
5156 GNUNET_assert (chvc->ve_count == 0);
5163 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5166 if (peerinfo != NULL)
5168 GNUNET_PEERINFO_disconnect (peerinfo);
5171 /* Can we assume those are gone by now, or do we need to clean up
5173 GNUNET_break (bl_head == NULL);
5174 GNUNET_break (bc_head == NULL);
5179 * Initiate transport service.
5181 * @param cls closure
5182 * @param s scheduler to use
5183 * @param server the initialized server
5184 * @param c configuration to use
5188 struct GNUNET_SCHEDULER_Handle *s,
5189 struct GNUNET_SERVER_Handle *server,
5190 const struct GNUNET_CONFIGURATION_Handle *c)
5192 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
5193 {&handle_start, NULL,
5194 GNUNET_MESSAGE_TYPE_TRANSPORT_START, 0},
5195 {&handle_hello, NULL,
5196 GNUNET_MESSAGE_TYPE_HELLO, 0},
5197 {&handle_send, NULL,
5198 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
5199 {&handle_set_quota, NULL,
5200 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
5201 {&handle_address_lookup, NULL,
5202 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
5204 {&handle_blacklist_init, NULL,
5205 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
5206 {&handle_blacklist_reply, NULL,
5207 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
5213 unsigned long long tneigh;
5218 stats = GNUNET_STATISTICS_create (sched, "transport", cfg);
5219 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
5220 /* parse configuration */
5222 GNUNET_CONFIGURATION_get_value_number (c,
5227 GNUNET_CONFIGURATION_get_value_filename (c,
5229 "HOSTKEY", &keyfile)))
5231 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5233 ("Transport service is lacking key configuration settings. Exiting.\n"));
5234 GNUNET_SCHEDULER_shutdown (s);
5237 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5240 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5241 validation_map = NULL;
5244 max_connect_per_transport = (uint32_t) tneigh;
5245 peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
5246 if (peerinfo == NULL)
5248 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5249 _("Could not access PEERINFO service. Exiting.\n"));
5250 GNUNET_SCHEDULER_shutdown (s);
5253 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5256 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5257 validation_map = NULL;
5258 GNUNET_free (keyfile);
5261 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
5262 GNUNET_free (keyfile);
5263 if (my_private_key == NULL)
5265 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5267 ("Transport service could not access hostkey. Exiting.\n"));
5268 GNUNET_SCHEDULER_shutdown (s);
5271 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5274 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5275 validation_map = NULL;
5278 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
5279 GNUNET_CRYPTO_hash (&my_public_key,
5280 sizeof (my_public_key), &my_identity.hashPubKey);
5281 /* setup notification */
5282 GNUNET_SERVER_disconnect_notify (server,
5283 &client_disconnect_notification, NULL);
5284 /* load plugins... */
5287 GNUNET_CONFIGURATION_get_value_string (c,
5288 "TRANSPORT", "PLUGINS", &plugs))
5290 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5291 _("Starting transport plugins `%s'\n"), plugs);
5292 pos = strtok (plugs, " ");
5295 start_transport (server, pos);
5297 pos = strtok (NULL, " ");
5299 GNUNET_free (plugs);
5301 GNUNET_SCHEDULER_add_delayed (sched,
5302 GNUNET_TIME_UNIT_FOREVER_REL,
5303 &shutdown_task, NULL);
5308 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
5310 /* If we have a blacklist file, read from it */
5311 read_blacklist_file(cfg);
5312 /* process client requests */
5313 GNUNET_SERVER_add_handlers (server, handlers);
5318 * The main function for the transport service.
5320 * @param argc number of arguments from the command line
5321 * @param argv command line arguments
5322 * @return 0 ok, 1 on error
5325 main (int argc, char *const *argv)
5327 a2s (NULL, NULL, 0); /* make compiler happy */
5328 return (GNUNET_OK ==
5329 GNUNET_SERVICE_run (argc,
5332 GNUNET_SERVICE_OPTION_NONE,
5333 &run, NULL)) ? 0 : 1;
5336 /* end of gnunet-service-transport.c */