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.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file transport/gnunet-service-transport.c
23 * @brief low-level P2P messaging
24 * @author Christian Grothoff
28 #include "gnunet_client_lib.h"
29 #include "gnunet_container_lib.h"
30 #include "gnunet_constants.h"
31 #include "gnunet_getopt_lib.h"
32 #include "gnunet_hello_lib.h"
33 #include "gnunet_os_lib.h"
34 #include "gnunet_peerinfo_service.h"
35 #include "gnunet_plugin_lib.h"
36 #include "gnunet_protocols.h"
37 #include "gnunet_service_lib.h"
38 #include "gnunet_signatures.h"
39 #include "gnunet_transport_plugin.h"
40 #include "transport.h"
42 #define DEBUG_BLACKLIST GNUNET_YES
44 #define DEBUG_PING_PONG GNUNET_YES
46 #define DEBUG_TRANSPORT_HELLO GNUNET_YES
49 * Should we do some additional checks (to validate behavior
52 #define EXTRA_CHECKS GNUNET_YES
55 * How many messages can we have pending for a given client process
56 * before we start to drop incoming messages? We typically should
57 * have only one client and so this would be the primary buffer for
58 * messages, so the number should be chosen rather generously.
60 * The expectation here is that most of the time the queue is large
61 * enough so that a drop is virtually never required. Note that
62 * this value must be about as large as 'TOTAL_MSGS' in the
63 * 'test_transport_api_reliability.c', otherwise that testcase may
66 #define MAX_PENDING (128 * 1024)
69 * Size of the per-transport blacklist hash maps.
71 #define TRANSPORT_BLACKLIST_HT_SIZE 16
74 * How often should we try to reconnect to a peer using a particular
75 * transport plugin before giving up? Note that the plugin may be
76 * added back to the list after PLUGIN_RETRY_FREQUENCY expires.
78 #define MAX_CONNECT_RETRY 3
81 * Limit on the number of ready-to-run tasks when validating
82 * HELLOs. If more tasks are ready to run, we will drop
83 * HELLOs instead of validating them.
85 #define MAX_HELLO_LOAD 4
88 * How often must a peer violate bandwidth quotas before we start
89 * to simply drop its messages?
91 #define QUOTA_VIOLATION_DROP_THRESHOLD 10
94 * How long until a HELLO verification attempt should time out?
95 * Must be rather small, otherwise a partially successful HELLO
96 * validation (some addresses working) might not be available
97 * before a client's request for a connection fails for good.
98 * Besides, if a single request to an address takes a long time,
99 * then the peer is unlikely worthwhile anyway.
101 #define HELLO_VERIFICATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
104 * How long is a PONG signature valid? We'll recycle a signature until
105 * 1/4 of this time is remaining. PONGs should expire so that if our
106 * external addresses change an adversary cannot replay them indefinitely.
107 * OTOH, we don't want to spend too much time generating PONG signatures,
108 * so they must have some lifetime to reduce our CPU usage.
110 #define PONG_SIGNATURE_LIFETIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
113 * Priority to use for PONG messages.
115 #define TRANSPORT_PONG_PRIORITY 4
118 * How often do we re-add (cheaper) plugins to our list of plugins
119 * to try for a given connected peer?
121 #define PLUGIN_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
124 * After how long do we expire an address in a HELLO that we just
125 * validated? This value is also used for our own addresses when we
128 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
132 * How long before an existing address expires should we again try to
133 * validate it? Must be (significantly) smaller than
134 * HELLO_ADDRESS_EXPIRATION.
136 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
139 * Maximum frequency for re-evaluating latencies for all transport addresses.
141 #define LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
144 * Maximum frequency for re-evaluating latencies for connected addresses.
146 #define CONNECTED_LATENCY_EVALUATION_MAX_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 1)
150 * List of addresses of other peers
152 struct ForeignAddressList
155 * This is a linked list.
157 struct ForeignAddressList *next;
160 * Which ready list does this entry belong to.
162 struct ReadyList *ready_list;
165 * How long until we auto-expire this address (unless it is
166 * re-confirmed by the transport)?
168 struct GNUNET_TIME_Absolute expires;
171 * Task used to re-validate addresses, updates latencies and
174 GNUNET_SCHEDULER_TaskIdentifier revalidate_task;
182 * Session (or NULL if no valid session currently exists or if the
183 * plugin does not use sessions).
185 struct Session *session;
188 * What was the last latency observed for this address, plugin and peer?
190 struct GNUNET_TIME_Relative latency;
193 * If we did not successfully transmit a message to the given peer
194 * via this connection during the specified time, we should consider
195 * the connection to be dead. This is used in the case that a TCP
196 * transport simply stalls writing to the stream but does not
197 * formerly get a signal that the other peer died.
199 struct GNUNET_TIME_Absolute timeout;
202 * How often have we tried to connect using this plugin? Used to
203 * discriminate against addresses that do not work well.
204 * FIXME: not yet used, but should be!
206 unsigned int connect_attempts;
209 * DV distance to this peer (1 if no DV is used).
210 * FIXME: need to set this from transport plugins!
220 * Have we ever estimated the latency of this address? Used to
221 * ensure that the first time we add an address, we immediately
227 * Are we currently connected via this address? The first time we
228 * successfully transmit or receive data to a peer via a particular
229 * address, we set this to GNUNET_YES. If we later get an error
230 * (disconnect notification, transmission failure, timeout), we set
231 * it back to GNUNET_NO.
236 * Is this plugin currently busy transmitting to the specific target?
237 * GNUNET_NO if not (initial, default state is GNUNET_NO). Internal
238 * messages do not count as 'in transmit'.
243 * Has this address been validated yet?
251 * Entry in linked list of network addresses for ourselves. Also
252 * includes a cached signature for 'struct TransportPongMessage's.
254 struct OwnAddressList
257 * This is a linked list.
259 struct OwnAddressList *next;
262 * How long until we actually auto-expire this address (unless it is
263 * re-confirmed by the transport)?
265 struct GNUNET_TIME_Absolute expires;
268 * How long until the current signature expires? (ZERO if the
269 * signature was never created).
271 struct GNUNET_TIME_Absolute pong_sig_expires;
274 * Signature for a 'struct TransportPongMessage' for this address.
276 struct GNUNET_CRYPTO_RsaSignature pong_signature;
287 * Entry in linked list of all of our plugins.
289 struct TransportPlugin
293 * This is a linked list.
295 struct TransportPlugin *next;
298 * API of the transport as returned by the plugin's
299 * initialization function.
301 struct GNUNET_TRANSPORT_PluginFunctions *api;
304 * Short name for the plugin (i.e. "tcp").
309 * Name of the library (i.e. "gnunet_plugin_transport_tcp").
314 * List of our known addresses for this transport.
316 struct OwnAddressList *addresses;
319 * Environment this transport service is using
322 struct GNUNET_TRANSPORT_PluginEnvironment env;
325 * ID of task that is used to clean up expired addresses.
327 GNUNET_SCHEDULER_TaskIdentifier address_update_task;
330 * Set to GNUNET_YES if we need to scrap the existing list of
331 * "addresses" and start fresh when we receive the next address
332 * update from a transport. Set to GNUNET_NO if we should just add
333 * the new address to the list and wait for the commit call.
338 * Hashmap of blacklisted peers for this particular transport.
340 struct GNUNET_CONTAINER_MultiHashMap *blacklist;
343 struct NeighbourList;
346 * For each neighbour we keep a list of messages
347 * that we still want to transmit to the neighbour.
353 * This is a doubly linked list.
355 struct MessageQueue *next;
358 * This is a doubly linked list.
360 struct MessageQueue *prev;
363 * The message(s) we want to transmit, GNUNET_MessageHeader(s)
364 * stuck together in memory. Allocated at the end of this struct.
366 const char *message_buf;
369 * Size of the message buf
371 size_t message_buf_size;
374 * Client responsible for queueing the message;
375 * used to check that a client has no two messages
376 * pending for the same target. Can be NULL.
378 struct TransportClient *client;
381 * Using which specific address should we send this message?
383 struct ForeignAddressList *specific_address;
386 * Peer ID of the Neighbour this entry belongs to.
388 struct GNUNET_PeerIdentity neighbour_id;
391 * Plugin that we used for the transmission.
392 * NULL until we scheduled a transmission.
394 struct TransportPlugin *plugin;
397 * At what time should we fail?
399 struct GNUNET_TIME_Absolute timeout;
402 * Internal message of the transport system that should not be
403 * included in the usual SEND-SEND_OK transmission confirmation
404 * traffic management scheme. Typically, "internal_msg" will
405 * be set whenever "client" is NULL (but it is not strictly
411 * How important is the message?
413 unsigned int priority;
419 * For a given Neighbour, which plugins are available
420 * to talk to this peer and what are their costs?
425 * This is a linked list.
427 struct ReadyList *next;
430 * Which of our transport plugins does this entry
433 struct TransportPlugin *plugin;
436 * Transport addresses, latency, and readiness for
437 * this particular plugin.
439 struct ForeignAddressList *addresses;
442 * To which neighbour does this ready list belong to?
444 struct NeighbourList *neighbour;
450 * Entry in linked list of all of our current neighbours.
456 * This is a linked list.
458 struct NeighbourList *next;
461 * Which of our transports is connected to this peer
462 * and what is their status?
464 struct ReadyList *plugins;
467 * Head of list of messages we would like to send to this peer;
468 * must contain at most one message per client.
470 struct MessageQueue *messages_head;
473 * Tail of list of messages we would like to send to this peer; must
474 * contain at most one message per client.
476 struct MessageQueue *messages_tail;
479 * Buffer for at most one payload message used when we receive
480 * payload data before our PING-PONG has succeeded. We then
481 * store such messages in this intermediary buffer until the
482 * connection is fully up.
484 struct GNUNET_MessageHeader *pre_connect_message_buffer;
487 * Context for peerinfo iteration.
488 * NULL after we are done processing peerinfo's information.
490 struct GNUNET_PEERINFO_IteratorContext *piter;
493 * Public key for this peer. Valid only if the respective flag is set below.
495 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
498 * Identity of this neighbour.
500 struct GNUNET_PeerIdentity id;
503 * ID of task scheduled to run when this peer is about to
504 * time out (will free resources associated with the peer).
506 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
509 * ID of task scheduled to run when we should retry transmitting
510 * the head of the message queue. Actually triggered when the
511 * transmission is timing out (we trigger instantly when we have
512 * a chance of success).
514 GNUNET_SCHEDULER_TaskIdentifier retry_task;
517 * How long until we should consider this peer dead
518 * (if we don't receive another message in the
521 struct GNUNET_TIME_Absolute peer_timeout;
524 * Tracker for inbound bandwidth.
526 struct GNUNET_BANDWIDTH_Tracker in_tracker;
529 * The latency we have seen for this particular address for
530 * this particular peer. This latency may have been calculated
531 * over multiple transports. This value reflects how long it took
532 * us to receive a response when SENDING via this particular
533 * transport/neighbour/address combination!
535 * FIXME: we need to periodically send PINGs to update this
536 * latency (at least more often than the current "huge" (11h?)
539 struct GNUNET_TIME_Relative latency;
542 * How often has the other peer (recently) violated the
543 * inbound traffic limit? Incremented by 10 per violation,
544 * decremented by 1 per non-violation (for each
547 unsigned int quota_violation_count;
550 * DV distance to this peer (1 if no DV is used).
555 * Have we seen an PONG from this neighbour in the past (and
556 * not had a disconnect since)?
561 * Do we have a valid public key for this neighbour?
563 int public_key_valid;
566 * Performance data for the peer.
568 struct GNUNET_TRANSPORT_ATS_Information *ats;
571 * Identity of the neighbour.
573 struct GNUNET_PeerIdentity peer;
578 * Message used to ask a peer to validate receipt (to check an address
579 * from a HELLO). Followed by the address we are trying to validate,
580 * or an empty address if we are just sending a PING to confirm that a
581 * connection which the receiver (of the PING) initiated is still valid.
583 struct TransportPingMessage
587 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
589 struct GNUNET_MessageHeader header;
592 * Challenge code (to ensure fresh reply).
594 uint32_t challenge GNUNET_PACKED;
597 * Who is the intended recipient?
599 struct GNUNET_PeerIdentity target;
605 * Message used to validate a HELLO. The challenge is included in the
606 * confirmation to make matching of replies to requests possible. The
607 * signature signs our public key, an expiration time and our address.<p>
609 * This message is followed by our transport address that the PING tried
610 * to confirm (if we liked it). The address can be empty (zero bytes)
611 * if the PING had not address either (and we received the request via
612 * a connection that we initiated).
614 struct TransportPongMessage
618 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
620 struct GNUNET_MessageHeader header;
623 * Challenge code from PING (showing freshness). Not part of what
624 * is signed so that we can re-use signatures.
626 uint32_t challenge GNUNET_PACKED;
631 struct GNUNET_CRYPTO_RsaSignature signature;
634 * What are we signing and why? Two possible reason codes can be here:
635 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
636 * plausible address for this peer (pid is set to identity of signer); or
637 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING to confirm that this is
638 * an address we used to connect to the peer with the given pid.
640 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
643 * When does this signature expire?
645 struct GNUNET_TIME_AbsoluteNBO expiration;
648 * Either the identity of the peer Who signed this message, or the
649 * identity of the peer that we're connected to using the given
650 * address (depending on purpose.type).
652 struct GNUNET_PeerIdentity pid;
655 * Size of address appended to this message (part of what is
656 * being signed, hence not redundant).
664 * Linked list of messages to be transmitted to the client. Each
665 * entry is followed by the actual message.
667 struct ClientMessageQueueEntry
670 * This is a doubly-linked list.
672 struct ClientMessageQueueEntry *next;
675 * This is a doubly-linked list.
677 struct ClientMessageQueueEntry *prev;
682 * Client connected to the transport service.
684 struct TransportClient
688 * This is a linked list.
690 struct TransportClient *next;
693 * Handle to the client.
695 struct GNUNET_SERVER_Client *client;
698 * Linked list of messages yet to be transmitted to
701 struct ClientMessageQueueEntry *message_queue_head;
704 * Tail of linked list of messages yet to be transmitted to the
707 struct ClientMessageQueueEntry *message_queue_tail;
710 * Current transmit request handle.
712 struct GNUNET_CONNECTION_TransmitHandle *th;
715 * Is a call to "transmit_send_continuation" pending? If so, we
716 * must not free this struct (even if the corresponding client
717 * disconnects) and instead only remove it from the linked list and
718 * set the "client" field to NULL.
723 * Length of the list of messages pending for this client.
725 unsigned int message_count;
731 * Context of currently active requests to peerinfo
732 * for validation of HELLOs.
734 struct CheckHelloValidatedContext;
738 * Entry in map of all HELLOs awaiting validation.
740 struct ValidationEntry
744 * NULL if this entry is not part of a larger HELLO validation.
746 struct CheckHelloValidatedContext *chvc;
749 * The address, actually a pointer to the end
750 * of this struct. Do not free!
755 * Name of the transport.
757 char *transport_name;
760 * The public key of the peer.
762 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
765 * ID of task that will clean up this entry if we don't succeed
766 * with the validation first.
768 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
771 * At what time did we send this validation?
773 struct GNUNET_TIME_Absolute send_time;
776 * Session being validated (or NULL for none).
778 struct Session *session;
781 * Challenge number we used.
794 * Context of currently active requests to peerinfo
795 * for validation of HELLOs.
797 struct CheckHelloValidatedContext
801 * This is a doubly-linked list.
803 struct CheckHelloValidatedContext *next;
806 * This is a doubly-linked list.
808 struct CheckHelloValidatedContext *prev;
811 * Hello that we are validating.
813 const struct GNUNET_HELLO_Message *hello;
816 * Context for peerinfo iteration.
817 * NULL after we are done processing peerinfo's information.
819 struct GNUNET_PEERINFO_IteratorContext *piter;
822 * Was a HELLO known for this peer to peerinfo?
827 * Number of validation entries currently referring to this
830 unsigned int ve_count;
838 static struct GNUNET_HELLO_Message *our_hello;
843 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
848 static struct GNUNET_PeerIdentity my_identity;
853 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
858 const struct GNUNET_CONFIGURATION_Handle *cfg;
861 * Linked list of all clients to this service.
863 static struct TransportClient *clients;
866 * All loaded plugins.
868 static struct TransportPlugin *plugins;
871 * Handle to peerinfo service.
873 static struct GNUNET_PEERINFO_Handle *peerinfo;
876 * All known neighbours and their HELLOs.
878 static struct NeighbourList *neighbours;
881 * Number of neighbours we'd like to have.
883 static uint32_t max_connect_per_transport;
886 * Head of linked list.
888 static struct CheckHelloValidatedContext *chvc_head;
891 * Tail of linked list.
893 static struct CheckHelloValidatedContext *chvc_tail;
896 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
897 * of the given peer that we are currently validating).
899 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
902 * Handle for reporting statistics.
904 static struct GNUNET_STATISTICS_Handle *stats;
907 * The peer specified by the given neighbour has timed-out or a plugin
908 * has disconnected. We may either need to do nothing (other plugins
909 * still up), or trigger a full disconnect and clean up. This
910 * function updates our state and do the necessary notifications.
911 * Also notifies our clients that the neighbour is now officially
914 * @param n the neighbour list entry for the peer
915 * @param check should we just check if all plugins
916 * disconnected or must we ask all plugins to
919 static void disconnect_neighbour (struct NeighbourList *n, int check);
922 * Check the ready list for the given neighbour and if a plugin is
923 * ready for transmission (and if we have a message), do so!
925 * @param neighbour target peer for which to transmit
927 static void try_transmission_to_peer (struct NeighbourList *neighbour);
931 * Find an entry in the neighbour list for a particular peer.
933 * @return NULL if not found.
935 static struct NeighbourList *
936 find_neighbour (const struct GNUNET_PeerIdentity *key)
938 struct NeighbourList *head = neighbours;
940 while ((head != NULL) &&
941 (0 != memcmp (key, &head->id, sizeof (struct GNUNET_PeerIdentity))))
948 * Find an entry in the transport list for a particular transport.
950 * @return NULL if not found.
952 static struct TransportPlugin *
953 find_transport (const char *short_name)
955 struct TransportPlugin *head = plugins;
956 while ((head != NULL) && (0 != strcmp (short_name, head->short_name)))
962 * Is a particular peer blacklisted for a particular transport?
964 * @param peer the peer to check for
965 * @param plugin the plugin used to connect to the peer
967 * @return GNUNET_YES if the peer is blacklisted, GNUNET_NO if not
970 is_blacklisted (const struct GNUNET_PeerIdentity *peer, struct TransportPlugin *plugin)
973 if (plugin->blacklist != NULL)
975 if (GNUNET_CONTAINER_multihashmap_contains(plugin->blacklist, &peer->hashPubKey) == GNUNET_YES)
978 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
979 _("Peer `%s:%s' is blacklisted!\n"),
980 plugin->short_name, GNUNET_i2s (peer));
991 add_peer_to_blacklist (struct GNUNET_PeerIdentity *peer, char *transport_name)
993 struct TransportPlugin *plugin;
995 plugin = find_transport(transport_name);
996 if (plugin == NULL) /* Nothing to do */
998 if (plugin->blacklist == NULL)
999 plugin->blacklist = GNUNET_CONTAINER_multihashmap_create(TRANSPORT_BLACKLIST_HT_SIZE);
1000 GNUNET_assert(plugin->blacklist != NULL);
1001 GNUNET_CONTAINER_multihashmap_put(plugin->blacklist, &peer->hashPubKey,
1003 GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE);
1008 * Read the blacklist file, containing transport:peer entries.
1009 * Provided the transport is loaded, set up hashmap with these
1010 * entries to blacklist peers by transport.
1014 read_blacklist_file (const struct GNUNET_CONFIGURATION_Handle *cfg)
1021 struct GNUNET_PeerIdentity pid;
1023 struct GNUNET_CRYPTO_HashAsciiEncoded enc;
1024 unsigned int entries_found;
1025 char *transport_name;
1028 GNUNET_CONFIGURATION_get_value_filename (cfg,
1034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1035 _("Option `%s' in section `%s' not specified!\n"),
1041 if (GNUNET_OK != GNUNET_DISK_file_test (fn))
1042 GNUNET_DISK_fn_write (fn, NULL, 0, GNUNET_DISK_PERM_USER_READ
1043 | GNUNET_DISK_PERM_USER_WRITE);
1044 if (0 != STAT (fn, &frstat))
1046 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1047 _("Could not read blacklist file `%s'\n"), fn);
1051 if (frstat.st_size == 0)
1054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1055 _("Blacklist file `%s' is empty.\n"),
1061 /* FIXME: use mmap */
1062 data = GNUNET_malloc_large (frstat.st_size);
1063 GNUNET_assert(data != NULL);
1064 if (frstat.st_size !=
1065 GNUNET_DISK_fn_read (fn, data, frstat.st_size))
1067 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1068 _("Failed to read blacklist from `%s'\n"), fn);
1075 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1077 while ((frstat.st_size >= sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)) &&
1078 (pos <= frstat.st_size - sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)))
1081 while ((colon_pos < frstat.st_size) && (data[colon_pos] != ':') && !isspace ( (unsigned char) data[colon_pos]))
1084 if (colon_pos >= frstat.st_size)
1086 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1087 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1088 (unsigned long long) colon_pos);
1094 if (isspace( (unsigned char) data[colon_pos]))
1096 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1097 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1098 (unsigned long long) colon_pos);
1100 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1104 tsize = colon_pos - pos;
1105 if ((pos >= frstat.st_size) || (pos + tsize >= frstat.st_size) || (tsize == 0))
1107 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1108 _("Syntax error in blacklist file at offset %llu, giving up!\n"),
1109 (unsigned long long) colon_pos);
1118 transport_name = GNUNET_malloc(tsize + 1);
1119 memcpy(transport_name, &data[pos], tsize);
1120 pos = colon_pos + 1;
1122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1123 _("Read transport name %s in blacklist file.\n"),
1126 memcpy (&enc, &data[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
1127 if (!isspace ( (unsigned char) enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1]))
1129 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1130 _("Syntax error in blacklist file at offset %llu, skipping bytes.\n"),
1131 (unsigned long long) pos);
1133 while ((pos < frstat.st_size) && (!isspace ( (unsigned char) data[pos])))
1135 GNUNET_free_non_null(transport_name);
1138 enc.encoding[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
1139 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string ((char *) &enc, &pid.hashPubKey))
1141 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1142 _("Syntax error in blacklist file at offset %llu, skipping bytes `%s'.\n"),
1143 (unsigned long long) pos,
1148 if (0 != memcmp (&pid,
1150 sizeof (struct GNUNET_PeerIdentity)))
1153 add_peer_to_blacklist (&pid,
1158 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1159 _("Found myself `%s' in blacklist (useless, ignored)\n"),
1163 pos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded);
1164 GNUNET_free_non_null(transport_name);
1165 while ((pos < frstat.st_size) && isspace ( (unsigned char) data[pos]))
1174 * Function called to notify a client about the socket being ready to
1175 * queue more data. "buf" will be NULL and "size" zero if the socket
1176 * was closed for writing in the meantime.
1178 * @param cls closure
1179 * @param size number of bytes available in buf
1180 * @param buf where the callee should write the message
1181 * @return number of bytes written to buf
1184 transmit_to_client_callback (void *cls, size_t size, void *buf)
1186 struct TransportClient *client = cls;
1187 struct ClientMessageQueueEntry *q;
1190 const struct GNUNET_MessageHeader *msg;
1196 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1197 "Transmission to client failed, closing connection.\n");
1198 /* fatal error with client, free message queue! */
1199 while (NULL != (q = client->message_queue_head))
1201 GNUNET_STATISTICS_update (stats,
1202 gettext_noop ("# bytes discarded (could not transmit to client)"),
1203 ntohs (((const struct GNUNET_MessageHeader*)&q[1])->size),
1205 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1206 client->message_queue_tail,
1210 client->message_count = 0;
1215 while (NULL != (q = client->message_queue_head))
1217 msg = (const struct GNUNET_MessageHeader *) &q[1];
1218 msize = ntohs (msg->size);
1219 if (msize + tsize > size)
1222 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1223 "Transmitting message of type %u to client.\n",
1226 GNUNET_CONTAINER_DLL_remove (client->message_queue_head,
1227 client->message_queue_tail,
1229 memcpy (&cbuf[tsize], msg, msize);
1232 client->message_count--;
1236 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1237 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1239 GNUNET_TIME_UNIT_FOREVER_REL,
1240 &transmit_to_client_callback,
1242 GNUNET_assert (client->th != NULL);
1249 * Convert an address to a string.
1251 * @param plugin name of the plugin responsible for the address
1252 * @param addr binary address
1253 * @param addr_len number of bytes in addr
1254 * @return NULL on error, otherwise address string
1257 a2s (const char *plugin,
1261 struct TransportPlugin *p;
1265 p = find_transport (plugin);
1268 return p->api->address_to_string (p->api->cls,
1275 * Mark the given FAL entry as 'connected' (and hence preferred for
1276 * sending); also mark all others for the same peer as 'not connected'
1277 * (since only one can be preferred).
1279 * @param fal address to set to 'connected'
1282 mark_address_connected (struct ForeignAddressList *fal)
1284 struct ForeignAddressList *pos;
1287 GNUNET_assert (GNUNET_YES == fal->validated);
1288 if (fal->connected == GNUNET_YES)
1289 return; /* nothing to do */
1291 pos = fal->ready_list->addresses;
1294 if (GNUNET_YES == pos->connected)
1297 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1298 "Marking address `%s' as no longer connected (due to connect on other address)\n",
1299 a2s (pos->ready_list->plugin->short_name,
1303 GNUNET_break (cnt == GNUNET_YES);
1305 pos->connected = GNUNET_NO;
1306 GNUNET_STATISTICS_update (stats,
1307 gettext_noop ("# connected addresses"),
1313 fal->connected = GNUNET_YES;
1314 if (GNUNET_YES == cnt)
1316 GNUNET_STATISTICS_update (stats,
1317 gettext_noop ("# connected addresses"),
1325 * Send the specified message to the specified client. Since multiple
1326 * messages may be pending for the same client at a time, this code
1327 * makes sure that no message is lost.
1329 * @param client client to transmit the message to
1330 * @param msg the message to send
1331 * @param may_drop can this message be dropped if the
1332 * message queue for this client is getting far too large?
1335 transmit_to_client (struct TransportClient *client,
1336 const struct GNUNET_MessageHeader *msg, int may_drop)
1338 struct ClientMessageQueueEntry *q;
1341 if ((client->message_count >= MAX_PENDING) && (GNUNET_YES == may_drop))
1343 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1345 ("Dropping message of type %u and size %u, have %u messages pending (%u is the soft limit)\n"),
1348 client->message_count,
1350 GNUNET_STATISTICS_update (stats,
1351 gettext_noop ("# messages dropped due to slow client"),
1356 msize = ntohs (msg->size);
1357 GNUNET_assert (msize >= sizeof (struct GNUNET_MessageHeader));
1358 q = GNUNET_malloc (sizeof (struct ClientMessageQueueEntry) + msize);
1359 memcpy (&q[1], msg, msize);
1360 GNUNET_CONTAINER_DLL_insert_after (client->message_queue_head,
1361 client->message_queue_tail,
1362 client->message_queue_tail,
1364 client->message_count++;
1365 if (client->th == NULL)
1367 client->th = GNUNET_SERVER_notify_transmit_ready (client->client,
1369 GNUNET_TIME_UNIT_FOREVER_REL,
1370 &transmit_to_client_callback,
1372 GNUNET_assert (client->th != NULL);
1378 * Transmit a 'SEND_OK' notification to the given client for the
1381 * @param client who to notify
1382 * @param n neighbour to notify about, can be NULL (on failure)
1383 * @param target target of the transmission
1384 * @param result status code for the transmission request
1387 transmit_send_ok (struct TransportClient *client,
1388 struct NeighbourList *n,
1389 const struct GNUNET_PeerIdentity *target,
1392 struct SendOkMessage send_ok_msg;
1394 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1395 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1396 send_ok_msg.success = htonl (result);
1398 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1400 send_ok_msg.latency = GNUNET_TIME_relative_hton (GNUNET_TIME_UNIT_FOREVER_REL);
1401 send_ok_msg.peer = *target;
1402 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1407 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1408 * upon "completion" of a send request. This tells the API
1409 * that it is now legal to send another message to the given
1412 * @param cls closure, identifies the entry on the
1413 * message queue that was transmitted and the
1414 * client responsible for queuing the message
1415 * @param target the peer receiving the message
1416 * @param result GNUNET_OK on success, if the transmission
1417 * failed, we should not tell the client to transmit
1421 transmit_send_continuation (void *cls,
1422 const struct GNUNET_PeerIdentity *target,
1425 struct MessageQueue *mq = cls;
1426 struct NeighbourList *n;
1428 GNUNET_STATISTICS_update (stats,
1429 gettext_noop ("# bytes pending with plugins"),
1430 - (int64_t) mq->message_buf_size,
1432 if (result == GNUNET_OK)
1434 GNUNET_STATISTICS_update (stats,
1435 gettext_noop ("# bytes successfully transmitted by plugins"),
1436 mq->message_buf_size,
1441 GNUNET_STATISTICS_update (stats,
1442 gettext_noop ("# bytes with transmission failure by plugins"),
1443 mq->message_buf_size,
1446 if (mq->specific_address != NULL)
1448 if (result == GNUNET_OK)
1450 mq->specific_address->timeout =
1451 GNUNET_TIME_relative_to_absolute
1452 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1453 if (mq->specific_address->validated == GNUNET_YES)
1454 mark_address_connected (mq->specific_address);
1458 if (mq->specific_address->connected != GNUNET_NO)
1461 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1462 "Marking address `%s' as no longer connected (due to transmission problem)\n",
1463 a2s (mq->specific_address->ready_list->plugin->short_name,
1464 mq->specific_address->addr,
1465 mq->specific_address->addrlen));
1467 GNUNET_STATISTICS_update (stats,
1468 gettext_noop ("# connected addresses"),
1471 mq->specific_address->connected = GNUNET_NO;
1474 if (! mq->internal_msg)
1475 mq->specific_address->in_transmit = GNUNET_NO;
1477 n = find_neighbour(&mq->neighbour_id);
1478 if (mq->client != NULL)
1479 transmit_send_ok (mq->client, n, target, result);
1482 try_transmission_to_peer (n);
1487 * Find an address in any of the available transports for
1488 * the given neighbour that would be good for message
1489 * transmission. This is essentially the transport selection
1492 * @param neighbour for whom to select an address
1493 * @return selected address, NULL if we have none
1495 struct ForeignAddressList *
1496 find_ready_address(struct NeighbourList *neighbour)
1498 struct ReadyList *head = neighbour->plugins;
1499 struct ForeignAddressList *addresses;
1500 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1501 struct ForeignAddressList *best_address;
1503 best_address = NULL;
1504 while (head != NULL)
1506 addresses = head->addresses;
1507 while (addresses != NULL)
1509 if ( (addresses->timeout.abs_value < now.abs_value) &&
1510 (addresses->connected == GNUNET_YES) )
1513 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1514 "Marking long-time inactive connection to `%4s' as down.\n",
1515 GNUNET_i2s (&neighbour->id));
1517 GNUNET_STATISTICS_update (stats,
1518 gettext_noop ("# connected addresses"),
1521 addresses->connected = GNUNET_NO;
1523 addresses = addresses->next;
1526 addresses = head->addresses;
1527 while (addresses != NULL)
1529 #if DEBUG_TRANSPORT > 1
1530 if (addresses->addr != NULL)
1531 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1532 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1533 a2s (head->plugin->short_name,
1535 addresses->addrlen),
1536 GNUNET_i2s (&neighbour->id),
1537 addresses->connected,
1538 addresses->in_transmit,
1539 addresses->validated,
1540 addresses->connect_attempts,
1541 (unsigned long long) addresses->timeout.abs_value,
1542 (unsigned int) addresses->distance);
1544 if ( ( (best_address == NULL) ||
1545 (addresses->connected == GNUNET_YES) ||
1546 (best_address->connected == GNUNET_NO) ) &&
1547 (addresses->in_transmit == GNUNET_NO) &&
1548 ( (best_address == NULL) ||
1549 (addresses->latency.rel_value < best_address->latency.rel_value)) )
1550 best_address = addresses;
1551 /* FIXME: also give lower-latency addresses that are not
1552 connected a chance some times... */
1553 addresses = addresses->next;
1557 if (best_address != NULL)
1560 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1561 "Best address found (`%s') has latency of %llu ms.\n",
1562 (best_address->addrlen > 0)
1563 ? a2s (best_address->ready_list->plugin->short_name,
1565 best_address->addrlen)
1567 best_address->latency.rel_value);
1572 GNUNET_STATISTICS_update (stats,
1573 gettext_noop ("# transmission attempts failed (no address)"),
1577 return best_address;
1583 * We should re-try transmitting to the given peer,
1584 * hopefully we've learned something in the meantime.
1587 retry_transmission_task (void *cls,
1588 const struct GNUNET_SCHEDULER_TaskContext *tc)
1590 struct NeighbourList *n = cls;
1592 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1593 try_transmission_to_peer (n);
1598 * Check the ready list for the given neighbour and if a plugin is
1599 * ready for transmission (and if we have a message), do so!
1601 * @param neighbour target peer for which to transmit
1604 try_transmission_to_peer (struct NeighbourList *neighbour)
1606 struct ReadyList *rl;
1607 struct MessageQueue *mq;
1608 struct GNUNET_TIME_Relative timeout;
1612 if (neighbour->messages_head == NULL)
1615 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1616 "Transmission queue for `%4s' is empty\n",
1617 GNUNET_i2s (&neighbour->id));
1619 return; /* nothing to do */
1622 mq = neighbour->messages_head;
1623 force_address = GNUNET_YES;
1624 if (mq->specific_address == NULL)
1626 mq->specific_address = find_ready_address(neighbour);
1627 GNUNET_STATISTICS_update (stats,
1628 gettext_noop ("# transport selected peer address freely"),
1631 force_address = GNUNET_NO;
1633 if (mq->specific_address == NULL)
1635 GNUNET_STATISTICS_update (stats,
1636 gettext_noop ("# transport failed to selected peer address"),
1639 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1640 if (timeout.rel_value == 0)
1643 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1644 "No destination address available to transmit message of size %u to peer `%4s'\n",
1645 mq->message_buf_size,
1646 GNUNET_i2s (&mq->neighbour_id));
1648 GNUNET_STATISTICS_update (stats,
1649 gettext_noop ("# bytes in message queue for other peers"),
1650 - (int64_t) mq->message_buf_size,
1652 GNUNET_STATISTICS_update (stats,
1653 gettext_noop ("# bytes discarded (no destination address available)"),
1654 mq->message_buf_size,
1656 if (mq->client != NULL)
1657 transmit_send_ok (mq->client, neighbour, &neighbour->id, GNUNET_NO);
1658 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1659 neighbour->messages_tail,
1662 return; /* nobody ready */
1664 GNUNET_STATISTICS_update (stats,
1665 gettext_noop ("# message delivery deferred (no address)"),
1668 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1669 GNUNET_SCHEDULER_cancel (neighbour->retry_task);
1670 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (timeout,
1671 &retry_transmission_task,
1674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1675 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1676 mq->message_buf_size,
1677 GNUNET_i2s (&mq->neighbour_id),
1680 /* FIXME: might want to trigger peerinfo lookup here
1681 (unless that's already pending...) */
1684 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1685 neighbour->messages_tail,
1687 if (mq->specific_address->connected == GNUNET_NO)
1688 mq->specific_address->connect_attempts++;
1689 rl = mq->specific_address->ready_list;
1690 mq->plugin = rl->plugin;
1691 if (!mq->internal_msg)
1692 mq->specific_address->in_transmit = GNUNET_YES;
1694 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1695 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1696 mq->message_buf_size,
1697 GNUNET_i2s (&neighbour->id),
1698 (mq->specific_address->addr != NULL)
1699 ? a2s (mq->plugin->short_name,
1700 mq->specific_address->addr,
1701 mq->specific_address->addrlen)
1703 rl->plugin->short_name);
1705 GNUNET_STATISTICS_update (stats,
1706 gettext_noop ("# bytes in message queue for other peers"),
1707 - (int64_t) mq->message_buf_size,
1709 GNUNET_STATISTICS_update (stats,
1710 gettext_noop ("# bytes pending with plugins"),
1711 mq->message_buf_size,
1713 ret = rl->plugin->api->send (rl->plugin->api->cls,
1716 mq->message_buf_size,
1718 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1719 mq->specific_address->session,
1720 mq->specific_address->addr,
1721 mq->specific_address->addrlen,
1723 &transmit_send_continuation, mq);
1726 /* failure, but 'send' would not call continuation in this case,
1727 so we need to do it here! */
1728 transmit_send_continuation (mq,
1736 * Send the specified message to the specified peer.
1738 * @param client source of the transmission request (can be NULL)
1739 * @param peer_address ForeignAddressList where we should send this message
1740 * @param priority how important is the message
1741 * @param timeout how long do we have to transmit?
1742 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1743 * @param message_buf_size total size of all messages in message_buf
1744 * @param is_internal is this an internal message; these are pre-pended and
1745 * also do not count for plugins being "ready" to transmit
1746 * @param neighbour handle to the neighbour for transmission
1749 transmit_to_peer (struct TransportClient *client,
1750 struct ForeignAddressList *peer_address,
1751 unsigned int priority,
1752 struct GNUNET_TIME_Relative timeout,
1753 const char *message_buf,
1754 size_t message_buf_size,
1755 int is_internal, struct NeighbourList *neighbour)
1757 struct MessageQueue *mq;
1762 /* check for duplicate submission */
1763 mq = neighbour->messages_head;
1766 if (mq->client == client)
1768 /* client transmitted to same peer twice
1769 before getting SEND_OK! */
1777 GNUNET_STATISTICS_update (stats,
1778 gettext_noop ("# bytes in message queue for other peers"),
1781 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1782 mq->specific_address = peer_address;
1783 mq->client = client;
1784 /* FIXME: this memcpy can be up to 7% of our total runtime! */
1785 memcpy (&mq[1], message_buf, message_buf_size);
1786 mq->message_buf = (const char*) &mq[1];
1787 mq->message_buf_size = message_buf_size;
1788 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1789 mq->internal_msg = is_internal;
1790 mq->priority = priority;
1791 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1793 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1794 neighbour->messages_tail,
1797 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1798 neighbour->messages_tail,
1799 neighbour->messages_tail,
1801 try_transmission_to_peer (neighbour);
1808 struct GeneratorContext
1810 struct TransportPlugin *plug_pos;
1811 struct OwnAddressList *addr_pos;
1812 struct GNUNET_TIME_Absolute expiration;
1820 address_generator (void *cls, size_t max, void *buf)
1822 struct GeneratorContext *gc = cls;
1825 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1827 gc->plug_pos = gc->plug_pos->next;
1828 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1830 if (NULL == gc->plug_pos)
1835 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1838 gc->addr_pos->addrlen, buf, max);
1839 gc->addr_pos = gc->addr_pos->next;
1845 * Construct our HELLO message from all of the addresses of
1846 * all of the transports.
1851 struct GNUNET_HELLO_Message *hello;
1852 struct TransportClient *cpos;
1853 struct NeighbourList *npos;
1854 struct GeneratorContext gc;
1856 gc.plug_pos = plugins;
1857 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1858 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1859 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1861 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1862 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1864 GNUNET_STATISTICS_update (stats,
1865 gettext_noop ("# refreshed my HELLO"),
1869 while (cpos != NULL)
1871 transmit_to_client (cpos,
1872 (const struct GNUNET_MessageHeader *) hello,
1877 GNUNET_free_non_null (our_hello);
1879 GNUNET_PEERINFO_add_peer (peerinfo, our_hello);
1881 while (npos != NULL)
1884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1885 "Transmitting updated `%s' to neighbour `%4s'\n",
1886 "HELLO", GNUNET_i2s (&npos->id));
1888 GNUNET_STATISTICS_update (stats,
1889 gettext_noop ("# transmitted my HELLO to other peers"),
1892 transmit_to_peer (NULL, NULL, 0,
1893 HELLO_ADDRESS_EXPIRATION,
1894 (const char *) our_hello,
1895 GNUNET_HELLO_size(our_hello),
1903 * Task used to clean up expired addresses for a plugin.
1905 * @param cls closure
1909 expire_address_task (void *cls,
1910 const struct GNUNET_SCHEDULER_TaskContext *tc);
1914 * Update the list of addresses for this plugin,
1915 * expiring those that are past their expiration date.
1917 * @param plugin addresses of which plugin should be recomputed?
1918 * @param fresh set to GNUNET_YES if a new address was added
1919 * and we need to regenerate the HELLO even if nobody
1923 update_addresses (struct TransportPlugin *plugin,
1926 static struct GNUNET_TIME_Absolute last_update;
1927 struct GNUNET_TIME_Relative min_remaining;
1928 struct GNUNET_TIME_Relative remaining;
1929 struct GNUNET_TIME_Absolute now;
1930 struct OwnAddressList *pos;
1931 struct OwnAddressList *prev;
1932 struct OwnAddressList *next;
1935 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1936 GNUNET_SCHEDULER_cancel (plugin->address_update_task);
1937 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1938 now = GNUNET_TIME_absolute_get ();
1939 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1940 expired = (GNUNET_TIME_absolute_get_duration (last_update).rel_value > (HELLO_ADDRESS_EXPIRATION.rel_value / 4));
1942 pos = plugin->addresses;
1946 if (pos->expires.abs_value < now.abs_value)
1948 expired = GNUNET_YES;
1950 plugin->addresses = pos->next;
1952 prev->next = pos->next;
1957 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1958 if (remaining.rel_value < min_remaining.rel_value)
1959 min_remaining = remaining;
1965 if (expired || fresh)
1970 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1971 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1973 plugin->address_update_task
1974 = GNUNET_SCHEDULER_add_delayed (min_remaining,
1975 &expire_address_task, plugin);
1980 * Task used to clean up expired addresses for a plugin.
1982 * @param cls closure
1986 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1988 struct TransportPlugin *plugin = cls;
1990 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1991 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1992 update_addresses (plugin, GNUNET_NO);
1997 * Iterator over hash map entries that NULLs the session of validation
1998 * entries that match the given session.
2000 * @param cls closure (the 'struct Session*' to match against)
2001 * @param key current key code (peer ID, not used)
2002 * @param value value in the hash map ('struct ValidationEntry*')
2003 * @return GNUNET_YES (we should continue to iterate)
2006 remove_session_validations (void *cls,
2007 const GNUNET_HashCode * key,
2010 struct Session *session = cls;
2011 struct ValidationEntry *ve = value;
2013 if (session == ve->session)
2020 * We've been disconnected from the other peer (for some
2021 * connection-oriented transport). Either quickly
2022 * re-establish the connection or signal the disconnect
2025 * Only signal CORE level disconnect if ALL addresses
2026 * for the peer are exhausted.
2028 * @param p overall plugin context
2029 * @param nl neighbour that was disconnected
2032 try_fast_reconnect (struct TransportPlugin *p,
2033 struct NeighbourList *nl)
2035 /* FIXME-MW: fast reconnect / transport switching not implemented... */
2036 /* Note: the idea here is to hide problems with transports (or
2037 switching between plugins) from the core to eliminate the need to
2038 re-negotiate session keys and the like; OTOH, we should tell core
2039 quickly (much faster than timeout) `if a connection was lost and
2040 could not be re-established (i.e. other peer went down or is
2041 unable / refuses to communicate);
2043 So we should consider:
2044 1) ideally: our own willingness / need to connect
2045 2) prior failures to connect to this peer (by plugin)
2046 3) ideally: reasons why other peer terminated (as far as knowable)
2048 Most importantly, it must be POSSIBLE for another peer to terminate
2049 a connection for a while (without us instantly re-establishing it).
2050 Similarly, if another peer is gone we should quickly notify CORE.
2051 OTOH, if there was a minor glitch (i.e. crash of gnunet-service-transport
2052 on the other end), we should reconnect in such a way that BOTH CORE
2053 services never even notice.
2054 Furthermore, the same mechanism (or small variation) could be used
2055 to switch to a better-performing plugin (ATS).
2057 Finally, this needs to be tested throughly... */
2060 * GNUNET_NO in the call below makes transport disconnect the peer,
2061 * even if only a single address (out of say, six) went away. This
2062 * function must be careful to ONLY disconnect if the peer is gone,
2063 * not just a specifi address.
2065 * More specifically, half the places it was used had it WRONG.
2068 /* No reconnect, signal disconnect instead! */
2069 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2070 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&nl->id),
2071 "try_fast_reconnect");
2072 disconnect_neighbour (nl, GNUNET_YES);
2077 * Function that will be called whenever the plugin internally
2078 * cleans up a session pointer and hence the service needs to
2079 * discard all of those sessions as well. Plugins that do not
2080 * use sessions can simply omit calling this function and always
2081 * use NULL wherever a session pointer is needed.
2083 * @param cls closure
2084 * @param peer which peer was the session for
2085 * @param session which session is being destoyed
2088 plugin_env_session_end (void *cls,
2089 const struct GNUNET_PeerIdentity *peer,
2090 struct Session *session)
2092 struct TransportPlugin *p = cls;
2093 struct NeighbourList *nl;
2094 struct ReadyList *rl;
2095 struct ForeignAddressList *pos;
2096 struct ForeignAddressList *prev;
2098 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2099 &remove_session_validations,
2101 nl = find_neighbour (peer);
2103 return; /* was never marked as connected */
2107 if (rl->plugin == p)
2112 return; /* was never marked as connected */
2114 pos = rl->addresses;
2115 while ( (pos != NULL) &&
2116 (pos->session != session) )
2122 return; /* was never marked as connected */
2123 pos->session = NULL;
2124 if (pos->addrlen != 0)
2126 if (nl->received_pong != GNUNET_NO)
2127 try_fast_reconnect (p, nl);
2130 /* was inbound connection, free 'pos' */
2132 rl->addresses = pos->next;
2134 prev->next = pos->next;
2135 if (GNUNET_SCHEDULER_NO_TASK != pos->revalidate_task)
2137 GNUNET_SCHEDULER_cancel (pos->revalidate_task);
2138 pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2141 if (nl->received_pong == GNUNET_NO)
2142 return; /* nothing to do, never connected... */
2143 /* check if we have any validated addresses left */
2144 pos = rl->addresses;
2149 try_fast_reconnect (p, nl);
2154 /* no valid addresses left, signal disconnect! */
2156 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2157 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&nl->id),
2158 "plugin_env_session_end");
2159 /* FIXME: This doesn't mean there are no addresses left for this PEER,
2160 * it means there aren't any left for this PLUGIN/PEER combination! So
2161 * calling disconnect_neighbor here with GNUNET_NO forces disconnect
2162 * when it isn't necessary. Using GNUNET_YES at least checks to see
2163 * if there are any addresses that work first, so as not to overdo it.
2166 disconnect_neighbour (nl, GNUNET_YES);
2171 * Function that must be called by each plugin to notify the
2172 * transport service about the addresses under which the transport
2173 * provided by the plugin can be reached.
2175 * @param cls closure
2176 * @param name name of the transport that generated the address
2177 * @param addr one of the addresses of the host, NULL for the last address
2178 * the specific address format depends on the transport
2179 * @param addrlen length of the address
2180 * @param expires when should this address automatically expire?
2183 plugin_env_notify_address (void *cls,
2187 struct GNUNET_TIME_Relative expires)
2189 struct TransportPlugin *p = cls;
2190 struct OwnAddressList *al;
2191 struct GNUNET_TIME_Absolute abex;
2193 GNUNET_assert (addr != NULL);
2194 abex = GNUNET_TIME_relative_to_absolute (expires);
2195 GNUNET_assert (p == find_transport (name));
2199 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
2202 update_addresses (p, GNUNET_NO);
2208 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
2209 al->next = p->addresses;
2212 al->addrlen = addrlen;
2213 memcpy (&al[1], addr, addrlen);
2214 update_addresses (p, GNUNET_YES);
2219 * Notify all of our clients about a peer connecting.
2222 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
2223 struct GNUNET_TIME_Relative latency,
2226 struct ConnectInfoMessage * cim;
2227 struct TransportClient *cpos;
2232 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2233 "Notifying clients about connection from `%s'\n",
2236 GNUNET_STATISTICS_update (stats,
2237 gettext_noop ("# peers connected"),
2242 size = sizeof (struct ConnectInfoMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
2243 if (size > GNUNET_SERVER_MAX_MESSAGE_SIZE)
2247 cim = GNUNET_malloc (size);
2249 cim->header.size = htons (size);
2250 cim->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2251 cim->ats_count = htonl(2);
2252 (&(cim->ats))[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
2253 (&(cim->ats))[0].value = htonl (distance);
2254 (&(cim->ats))[1].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY);
2255 (&(cim->ats))[1].value = htonl ((uint32_t) latency.rel_value);
2256 (&(cim->ats))[2].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
2257 (&(cim->ats))[2].value = htonl (0);
2258 memcpy (&cim->id, peer, sizeof (struct GNUNET_PeerIdentity));
2260 while (cpos != NULL)
2262 transmit_to_client (cpos, &(cim->header), GNUNET_NO);
2270 * Notify all of our clients about a peer disconnecting.
2273 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2275 struct DisconnectInfoMessage dim;
2276 struct TransportClient *cpos;
2279 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2280 "Notifying clients about lost connection to `%s'\n",
2283 GNUNET_STATISTICS_update (stats,
2284 gettext_noop ("# peers connected"),
2287 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2288 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2289 dim.reserved = htonl (0);
2290 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2292 while (cpos != NULL)
2294 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2301 * Find a ForeignAddressList entry for the given neighbour
2302 * that matches the given address and transport.
2304 * @param neighbour which peer we care about
2305 * @param tname name of the transport plugin
2306 * @param session session to look for, NULL for 'any'; otherwise
2307 * can be used for the service to "learn" this session ID
2309 * @param addr binary address
2310 * @param addrlen length of addr
2311 * @return NULL if no such entry exists
2313 static struct ForeignAddressList *
2314 find_peer_address(struct NeighbourList *neighbour,
2316 struct Session *session,
2320 struct ReadyList *head;
2321 struct ForeignAddressList *pos;
2323 head = neighbour->plugins;
2324 while (head != NULL)
2326 if (0 == strcmp (tname, head->plugin->short_name))
2332 pos = head->addresses;
2333 while ( (pos != NULL) &&
2334 ( (pos->addrlen != addrlen) ||
2335 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2337 if ( (session != NULL) &&
2338 (pos->session == session) )
2342 if ( (session != NULL) && (pos != NULL) )
2343 pos->session = session; /* learn it! */
2349 * Get the peer address struct for the given neighbour and
2350 * address. If it doesn't yet exist, create it.
2352 * @param neighbour which peer we care about
2353 * @param tname name of the transport plugin
2354 * @param session session of the plugin, or NULL for none
2355 * @param addr binary address
2356 * @param addrlen length of addr
2357 * @return NULL if we do not have a transport plugin for 'tname'
2359 static struct ForeignAddressList *
2360 add_peer_address (struct NeighbourList *neighbour,
2362 struct Session *session,
2366 struct ReadyList *head;
2367 struct ForeignAddressList *ret;
2369 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2372 head = neighbour->plugins;
2374 while (head != NULL)
2376 if (0 == strcmp (tname, head->plugin->short_name))
2382 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2383 ret->session = session;
2386 ret->addr = (const char*) &ret[1];
2387 memcpy (&ret[1], addr, addrlen);
2393 ret->addrlen = addrlen;
2394 ret->expires = GNUNET_TIME_relative_to_absolute
2395 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2396 ret->latency = GNUNET_TIME_relative_get_forever();
2398 ret->timeout = GNUNET_TIME_relative_to_absolute
2399 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2400 ret->ready_list = head;
2401 ret->next = head->addresses;
2402 head->addresses = ret;
2408 * Closure for 'add_validated_address'.
2410 struct AddValidatedAddressContext
2413 * Entry that has been validated.
2415 const struct ValidationEntry *ve;
2418 * Flag set after we have added the address so
2419 * that we terminate the iteration next time.
2426 * Callback function used to fill a buffer of max bytes with a list of
2427 * addresses in the format used by HELLOs. Should use
2428 * "GNUNET_HELLO_add_address" as a helper function.
2430 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2431 * @param max maximum number of bytes that can be written to buf
2432 * @param buf where to write the address information
2433 * @return number of bytes written, 0 to signal the
2434 * end of the iteration.
2437 add_validated_address (void *cls,
2438 size_t max, void *buf)
2440 struct AddValidatedAddressContext *avac = cls;
2441 const struct ValidationEntry *ve = avac->ve;
2443 if (GNUNET_YES == avac->done)
2445 avac->done = GNUNET_YES;
2446 return GNUNET_HELLO_add_address (ve->transport_name,
2447 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2457 * Closure for 'check_address_exists'.
2459 struct CheckAddressExistsClosure
2462 * Address to check for.
2467 * Name of the transport.
2474 struct Session *session;
2477 * Set to GNUNET_YES if the address exists.
2490 * Iterator over hash map entries. Checks if the given
2491 * validation entry is for the same address as what is given
2494 * @param cls the 'struct CheckAddressExistsClosure*'
2495 * @param key current key code (ignored)
2496 * @param value value in the hash map ('struct ValidationEntry')
2497 * @return GNUNET_YES if we should continue to
2498 * iterate (mismatch), GNUNET_NO if not (entry matched)
2501 check_address_exists (void *cls,
2502 const GNUNET_HashCode * key,
2505 struct CheckAddressExistsClosure *caec = cls;
2506 struct ValidationEntry *ve = value;
2508 if ( (0 == strcmp (caec->tname,
2509 ve->transport_name)) &&
2510 (caec->addrlen == ve->addrlen) &&
2511 (0 == memcmp (caec->addr,
2515 caec->exists = GNUNET_YES;
2518 if ( (ve->session != NULL) &&
2519 (caec->session == ve->session) )
2521 caec->exists = GNUNET_YES;
2530 * Iterator to free entries in the validation_map.
2532 * @param cls closure (unused)
2533 * @param key current key code
2534 * @param value value in the hash map (validation to abort)
2535 * @return GNUNET_YES (always)
2538 abort_validation (void *cls,
2539 const GNUNET_HashCode * key,
2542 struct ValidationEntry *va = value;
2544 if (GNUNET_SCHEDULER_NO_TASK != va->timeout_task)
2545 GNUNET_SCHEDULER_cancel (va->timeout_task);
2546 GNUNET_free (va->transport_name);
2547 if (va->chvc != NULL)
2549 va->chvc->ve_count--;
2550 if (va->chvc->ve_count == 0)
2552 GNUNET_CONTAINER_DLL_remove (chvc_head,
2555 GNUNET_free (va->chvc);
2565 * HELLO validation cleanup task (validation failed).
2567 * @param cls the 'struct ValidationEntry' that failed
2568 * @param tc scheduler context (unused)
2571 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2573 struct ValidationEntry *va = cls;
2574 struct GNUNET_PeerIdentity pid;
2576 va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2577 GNUNET_STATISTICS_update (stats,
2578 gettext_noop ("# address validation timeouts"),
2581 GNUNET_CRYPTO_hash (&va->publicKey,
2583 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2585 GNUNET_break (GNUNET_OK ==
2586 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2589 abort_validation (NULL, NULL, va);
2594 neighbour_timeout_task (void *cls,
2595 const struct GNUNET_SCHEDULER_TaskContext *tc)
2597 struct NeighbourList *n = cls;
2600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2601 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2603 GNUNET_STATISTICS_update (stats,
2604 gettext_noop ("# disconnects due to timeout"),
2607 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2608 disconnect_neighbour (n, GNUNET_NO);
2613 * Schedule the job that will cause us to send a PING to the
2614 * foreign address to evaluate its validity and latency.
2616 * @param fal address to PING
2619 schedule_next_ping (struct ForeignAddressList *fal);
2623 * Add the given address to the list of foreign addresses
2624 * available for the given peer (check for duplicates).
2626 * @param cls the respective 'struct NeighbourList' to update
2627 * @param tname name of the transport
2628 * @param expiration expiration time
2629 * @param addr the address
2630 * @param addrlen length of the address
2631 * @return GNUNET_OK (always)
2634 add_to_foreign_address_list (void *cls,
2636 struct GNUNET_TIME_Absolute expiration,
2640 struct NeighbourList *n = cls;
2641 struct ForeignAddressList *fal;
2644 GNUNET_STATISTICS_update (stats,
2645 gettext_noop ("# valid peer addresses returned by PEERINFO"),
2649 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2652 #if DEBUG_TRANSPORT_HELLO
2653 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2654 "Adding address `%s' (%s) for peer `%4s' due to PEERINFO data for %llums.\n",
2655 a2s (tname, addr, addrlen),
2657 GNUNET_i2s (&n->id),
2658 expiration.abs_value);
2660 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2663 GNUNET_STATISTICS_update (stats,
2664 gettext_noop ("# previously validated addresses lacking transport"),
2670 fal->expires = GNUNET_TIME_absolute_max (expiration,
2672 schedule_next_ping (fal);
2678 fal->expires = GNUNET_TIME_absolute_max (expiration,
2683 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2684 "Failed to add new address for `%4s'\n",
2685 GNUNET_i2s (&n->id));
2688 if (fal->validated == GNUNET_NO)
2690 fal->validated = GNUNET_YES;
2691 GNUNET_STATISTICS_update (stats,
2692 gettext_noop ("# peer addresses considered valid"),
2696 if (try == GNUNET_YES)
2698 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2699 "Have new addresses, will try to trigger transmissions.\n");
2700 try_transmission_to_peer (n);
2707 * Add addresses in validated HELLO "h" to the set of addresses
2708 * we have for this peer.
2710 * @param cls closure ('struct NeighbourList*')
2711 * @param peer id of the peer, NULL for last call
2712 * @param h hello message for the peer (can be NULL)
2715 add_hello_for_peer (void *cls,
2716 const struct GNUNET_PeerIdentity *peer,
2717 const struct GNUNET_HELLO_Message *h)
2719 struct NeighbourList *n = cls;
2723 GNUNET_STATISTICS_update (stats,
2724 gettext_noop ("# outstanding peerinfo iterate requests"),
2731 return; /* no HELLO available */
2733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2734 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2738 if (GNUNET_YES != n->public_key_valid)
2740 GNUNET_HELLO_get_key (h, &n->publicKey);
2741 n->public_key_valid = GNUNET_YES;
2743 GNUNET_HELLO_iterate_addresses (h,
2745 &add_to_foreign_address_list,
2751 * Create a fresh entry in our neighbour list for the given peer.
2752 * Will try to transmit our current HELLO to the new neighbour.
2753 * Do not call this function directly, use 'setup_peer_check_blacklist.
2755 * @param peer the peer for which we create the entry
2756 * @param do_hello should we schedule transmitting a HELLO
2757 * @return the new neighbour list entry
2759 static struct NeighbourList *
2760 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2763 struct NeighbourList *n;
2764 struct TransportPlugin *tp;
2765 struct ReadyList *rl;
2768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2769 "Setting up state for neighbour `%4s'\n",
2772 GNUNET_assert (our_hello != NULL);
2773 GNUNET_STATISTICS_update (stats,
2774 gettext_noop ("# active neighbours"),
2777 n = GNUNET_malloc (sizeof (struct NeighbourList));
2778 n->next = neighbours;
2782 GNUNET_TIME_relative_to_absolute
2783 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2784 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2785 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2786 MAX_BANDWIDTH_CARRY_S);
2790 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2792 rl = GNUNET_malloc (sizeof (struct ReadyList));
2794 rl->next = n->plugins;
2797 rl->addresses = NULL;
2801 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2803 n->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2804 &neighbour_timeout_task, n);
2807 GNUNET_STATISTICS_update (stats,
2808 gettext_noop ("# peerinfo new neighbor iterate requests"),
2811 GNUNET_STATISTICS_update (stats,
2812 gettext_noop ("# outstanding peerinfo iterate requests"),
2815 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2816 GNUNET_TIME_UNIT_FOREVER_REL,
2817 &add_hello_for_peer, n);
2819 GNUNET_STATISTICS_update (stats,
2820 gettext_noop ("# HELLO's sent to new neighbors"),
2823 transmit_to_peer (NULL, NULL, 0,
2824 HELLO_ADDRESS_EXPIRATION,
2825 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2833 * Function called after we have checked if communicating
2834 * with a given peer is acceptable.
2836 * @param cls closure
2837 * @param n NULL if communication is not acceptable
2839 typedef void (*SetupContinuation)(void *cls,
2840 struct NeighbourList *n);
2844 * Information kept for each client registered to perform
2850 * This is a linked list.
2852 struct Blacklisters *next;
2855 * This is a linked list.
2857 struct Blacklisters *prev;
2860 * Client responsible for this entry.
2862 struct GNUNET_SERVER_Client *client;
2865 * Blacklist check that we're currently performing.
2867 struct BlacklistCheck *bc;
2873 * Head of DLL of blacklisting clients.
2875 static struct Blacklisters *bl_head;
2878 * Tail of DLL of blacklisting clients.
2880 static struct Blacklisters *bl_tail;
2884 * Context we use when performing a blacklist check.
2886 struct BlacklistCheck
2890 * This is a linked list.
2892 struct BlacklistCheck *next;
2895 * This is a linked list.
2897 struct BlacklistCheck *prev;
2900 * Peer being checked.
2902 struct GNUNET_PeerIdentity peer;
2905 * Option for setup neighbour afterwards.
2910 * Continuation to call with the result.
2912 SetupContinuation cont;
2920 * Current transmission request handle for this client, or NULL if no
2921 * request is pending.
2923 struct GNUNET_CONNECTION_TransmitHandle *th;
2926 * Our current position in the blacklisters list.
2928 struct Blacklisters *bl_pos;
2931 * Current task performing the check.
2933 GNUNET_SCHEDULER_TaskIdentifier task;
2938 * Head of DLL of active blacklisting queries.
2940 static struct BlacklistCheck *bc_head;
2943 * Tail of DLL of active blacklisting queries.
2945 static struct BlacklistCheck *bc_tail;
2949 * Perform next action in the blacklist check.
2951 * @param cls the 'struct BlacklistCheck*'
2955 do_blacklist_check (void *cls,
2956 const struct GNUNET_SCHEDULER_TaskContext *tc);
2960 * Transmit blacklist query to the client.
2962 * @param cls the 'struct BlacklistCheck'
2963 * @param size number of bytes allowed
2964 * @param buf where to copy the message
2965 * @return number of bytes copied to buf
2968 transmit_blacklist_message (void *cls,
2972 struct BlacklistCheck *bc = cls;
2973 struct Blacklisters *bl;
2974 struct BlacklistMessage bm;
2979 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2980 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
2985 bm.header.size = htons (sizeof (struct BlacklistMessage));
2986 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2987 bm.is_allowed = htonl (0);
2989 memcpy (buf, &bm, sizeof (bm));
2990 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2996 * Perform next action in the blacklist check.
2998 * @param cls the 'struct BlacklistCheck*'
3002 do_blacklist_check (void *cls,
3003 const struct GNUNET_SCHEDULER_TaskContext *tc)
3005 struct BlacklistCheck *bc = cls;
3006 struct Blacklisters *bl;
3008 bc->task = GNUNET_SCHEDULER_NO_TASK;
3012 bc->cont (bc->cont_cls,
3013 setup_new_neighbour (&bc->peer, bc->do_hello));
3020 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
3021 sizeof (struct BlacklistMessage),
3022 GNUNET_TIME_UNIT_FOREVER_REL,
3023 &transmit_blacklist_message,
3030 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
3031 * does not yet exist, check the blacklist. If the blacklist says creating
3032 * one is acceptable, create one and call the continuation; otherwise
3033 * call the continuation with NULL.
3035 * @param peer peer to setup or look up a struct NeighbourList for
3036 * @param do_hello should we also schedule sending our HELLO to the peer
3037 * if this is a new record
3038 * @param cont function to call with the 'struct NeigbhbourList*'
3039 * @param cont_cls closure for cont
3042 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
3044 SetupContinuation cont,
3047 struct NeighbourList *n;
3048 struct BlacklistCheck *bc;
3050 n = find_neighbour(peer);
3057 if (bl_head == NULL)
3060 cont (cont_cls, setup_new_neighbour (peer, do_hello));
3062 setup_new_neighbour(peer, do_hello);
3065 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3066 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3068 bc->do_hello = do_hello;
3070 bc->cont_cls = cont_cls;
3071 bc->bl_pos = bl_head;
3072 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3078 * Function called with the result of querying a new blacklister about
3079 * it being allowed (or not) to continue to talk to an existing neighbour.
3081 * @param cls the original 'struct NeighbourList'
3082 * @param n NULL if we need to disconnect
3085 confirm_or_drop_neighbour (void *cls,
3086 struct NeighbourList *n)
3088 struct NeighbourList * orig = cls;
3092 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3093 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&orig->id),
3094 "confirm_or_drop_neighboUr");
3095 disconnect_neighbour (orig, GNUNET_NO);
3101 * Handle a request to start a blacklist.
3103 * @param cls closure (always NULL)
3104 * @param client identification of the client
3105 * @param message the actual message
3108 handle_blacklist_init (void *cls,
3109 struct GNUNET_SERVER_Client *client,
3110 const struct GNUNET_MessageHeader *message)
3112 struct Blacklisters *bl;
3113 struct BlacklistCheck *bc;
3114 struct NeighbourList *n;
3119 if (bl->client == client)
3122 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3127 bl = GNUNET_malloc (sizeof (struct Blacklisters));
3128 bl->client = client;
3129 GNUNET_SERVER_client_keep (client);
3130 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
3131 /* confirm that all existing connections are OK! */
3135 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3136 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3138 bc->do_hello = GNUNET_NO;
3139 bc->cont = &confirm_or_drop_neighbour;
3142 if (n == neighbours) /* all would wait for the same client, no need to
3143 create more than just the first task right now */
3144 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3152 * Handle a request to blacklist a peer.
3154 * @param cls closure (always NULL)
3155 * @param client identification of the client
3156 * @param message the actual message
3159 handle_blacklist_reply (void *cls,
3160 struct GNUNET_SERVER_Client *client,
3161 const struct GNUNET_MessageHeader *message)
3163 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
3164 struct Blacklisters *bl;
3165 struct BlacklistCheck *bc;
3168 while ( (bl != NULL) &&
3169 (bl->client != client) )
3173 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3178 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
3180 bc->cont (bc->cont_cls, NULL);
3181 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
3186 bc->bl_pos = bc->bl_pos->next;
3187 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3190 /* check if any other bc's are waiting for this blacklister */
3194 if ( (bc->bl_pos == bl) &&
3195 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
3196 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3204 * Send periodic PING messages to a given foreign address.
3206 * @param cls our 'struct PeriodicValidationContext*'
3207 * @param tc task context
3210 send_periodic_ping (void *cls,
3211 const struct GNUNET_SCHEDULER_TaskContext *tc)
3213 struct ForeignAddressList *peer_address = cls;
3214 struct TransportPlugin *tp;
3215 struct ValidationEntry *va;
3216 struct NeighbourList *neighbour;
3217 struct TransportPingMessage ping;
3218 struct CheckAddressExistsClosure caec;
3220 uint16_t hello_size;
3224 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3225 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3227 tp = peer_address->ready_list->plugin;
3228 neighbour = peer_address->ready_list->neighbour;
3229 if (GNUNET_YES != neighbour->public_key_valid)
3231 /* no public key yet, try again later */
3232 schedule_next_ping (peer_address);
3235 caec.addr = peer_address->addr;
3236 caec.addrlen = peer_address->addrlen;
3237 caec.tname = tp->short_name;
3238 caec.session = peer_address->session;
3239 caec.exists = GNUNET_NO;
3240 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3241 &check_address_exists,
3243 if (caec.exists == GNUNET_YES)
3245 /* During validation attempts we will likely trigger the other
3246 peer trying to validate our address which in turn will cause
3247 it to send us its HELLO, so we expect to hit this case rather
3248 frequently. Only print something if we are very verbose. */
3249 #if DEBUG_TRANSPORT > 1
3250 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3251 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3252 (peer_address->addr != NULL)
3253 ? a2s (tp->short_name,
3255 peer_address->addrlen)
3258 GNUNET_i2s (&neighbour->id));
3260 schedule_next_ping (peer_address);
3263 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3264 va->transport_name = GNUNET_strdup (tp->short_name);
3265 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
3267 va->send_time = GNUNET_TIME_absolute_get();
3268 va->session = peer_address->session;
3269 if (peer_address->addr != NULL)
3271 va->addr = (const void*) &va[1];
3272 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3273 va->addrlen = peer_address->addrlen;
3275 memcpy(&va->publicKey,
3276 &neighbour->publicKey,
3277 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3279 va->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_VERIFICATION_TIMEOUT,
3280 &timeout_hello_validation,
3282 GNUNET_CONTAINER_multihashmap_put (validation_map,
3283 &neighbour->id.hashPubKey,
3285 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3287 if (peer_address->validated != GNUNET_YES)
3288 hello_size = GNUNET_HELLO_size(our_hello);
3292 tsize = sizeof(struct TransportPingMessage) + hello_size;
3294 if (peer_address->addr != NULL)
3296 slen = strlen (tp->short_name) + 1;
3297 tsize += slen + peer_address->addrlen;
3301 slen = 0; /* make gcc happy */
3303 message_buf = GNUNET_malloc(tsize);
3304 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3305 ping.challenge = htonl(va->challenge);
3306 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3307 if (peer_address->validated != GNUNET_YES)
3309 memcpy(message_buf, our_hello, hello_size);
3312 if (peer_address->addr != NULL)
3314 ping.header.size = htons(sizeof(struct TransportPingMessage) +
3315 peer_address->addrlen +
3317 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3320 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3322 peer_address->addrlen);
3326 ping.header.size = htons(sizeof(struct TransportPingMessage));
3329 memcpy(&message_buf[hello_size],
3331 sizeof(struct TransportPingMessage));
3333 #if DEBUG_TRANSPORT_REVALIDATION
3334 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3335 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s'\n",
3336 (peer_address->addr != NULL)
3337 ? a2s (peer_address->plugin->short_name,
3339 peer_address->addrlen)
3342 GNUNET_i2s (&neighbour->id),
3343 "HELLO", hello_size,
3346 if (peer_address->validated != GNUNET_YES)
3347 GNUNET_STATISTICS_update (stats,
3348 gettext_noop ("# PING with HELLO messages sent"),
3352 GNUNET_STATISTICS_update (stats,
3353 gettext_noop ("# PING without HELLO messages sent"),
3356 GNUNET_STATISTICS_update (stats,
3357 gettext_noop ("# PING messages sent for re-validation"),
3360 transmit_to_peer (NULL, peer_address,
3361 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3362 HELLO_VERIFICATION_TIMEOUT,
3364 GNUNET_YES, neighbour);
3365 GNUNET_free(message_buf);
3366 schedule_next_ping (peer_address);
3371 * Schedule the job that will cause us to send a PING to the
3372 * foreign address to evaluate its validity and latency.
3374 * @param fal address to PING
3377 schedule_next_ping (struct ForeignAddressList *fal)
3379 struct GNUNET_TIME_Relative delay;
3381 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3383 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3384 delay.rel_value /= 2; /* do before expiration */
3385 delay = GNUNET_TIME_relative_min (delay,
3386 LATENCY_EVALUATION_MAX_DELAY);
3387 if (GNUNET_YES != fal->estimated)
3389 delay = GNUNET_TIME_UNIT_ZERO;
3390 fal->estimated = GNUNET_YES;
3392 if (GNUNET_YES == fal->connected)
3394 delay = GNUNET_TIME_relative_min (delay,
3395 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3397 /* FIXME: also adjust delay based on how close the last
3398 observed latency is to the latency of the best alternative */
3399 /* bound how fast we can go */
3400 delay = GNUNET_TIME_relative_max (delay,
3401 GNUNET_TIME_UNIT_SECONDS);
3402 /* randomize a bit (to avoid doing all at the same time) */
3403 delay.rel_value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3404 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(delay,
3405 &send_periodic_ping,
3413 * Function that will be called if we receive some payload
3414 * from another peer.
3416 * @param message the payload
3417 * @param n peer who claimed to be the sender
3420 handle_payload_message (const struct GNUNET_MessageHeader *message,
3421 struct NeighbourList *n)
3423 struct InboundMessage *im;
3424 struct TransportClient *cpos;
3427 msize = ntohs (message->size);
3428 if (n->received_pong == GNUNET_NO)
3430 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3431 "Received message of type %u and size %u from `%4s', but no pong yet!!\n",
3432 ntohs (message->type),
3433 ntohs (message->size),
3434 GNUNET_i2s (&n->id));
3435 GNUNET_free_non_null (n->pre_connect_message_buffer);
3436 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3437 memcpy (n->pre_connect_message_buffer, message, msize);
3442 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3443 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
3444 ntohs (message->type),
3445 ntohs (message->size),
3446 GNUNET_i2s (&n->id));
3448 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3451 n->quota_violation_count++;
3453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3454 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3455 n->in_tracker.available_bytes_per_s__,
3456 n->quota_violation_count);
3458 /* Discount 32k per violation */
3459 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3464 if (n->quota_violation_count > 0)
3466 /* try to add 32k back */
3467 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3469 n->quota_violation_count--;
3472 GNUNET_STATISTICS_update (stats,
3473 gettext_noop ("# payload received from other peers"),
3476 /* transmit message to all clients */
3477 uint32_t ats_count = 2;
3478 size_t size = sizeof (struct InboundMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information) + msize;
3479 if (size > GNUNET_SERVER_MAX_MESSAGE_SIZE)
3482 im = GNUNET_malloc (size);
3483 im->header.size = htons (size);
3484 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3486 im->ats_count = htonl(ats_count);
3487 /* Setting ATS data */
3488 (&(im->ats))[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
3489 (&(im->ats))[0].value = htonl (n->distance);
3490 (&(im->ats))[1].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY);
3491 (&(im->ats))[1].value = htonl ((uint32_t) n->latency.rel_value);
3492 (&(im->ats))[ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3493 (&(im->ats))[ats_count].value = htonl (0);
3495 memcpy (&((&(im->ats))[ats_count+1]), message, msize);
3497 while (cpos != NULL)
3499 transmit_to_client (cpos, &im->header, GNUNET_YES);
3507 * Iterator over hash map entries. Checks if the given validation
3508 * entry is for the same challenge as what is given in the PONG.
3510 * @param cls the 'struct TransportPongMessage*'
3511 * @param key peer identity
3512 * @param value value in the hash map ('struct ValidationEntry')
3513 * @return GNUNET_YES if we should continue to
3514 * iterate (mismatch), GNUNET_NO if not (entry matched)
3517 check_pending_validation (void *cls,
3518 const GNUNET_HashCode * key,
3521 const struct TransportPongMessage *pong = cls;
3522 struct ValidationEntry *ve = value;
3523 struct AddValidatedAddressContext avac;
3524 unsigned int challenge = ntohl(pong->challenge);
3525 struct GNUNET_HELLO_Message *hello;
3526 struct GNUNET_PeerIdentity target;
3527 struct NeighbourList *n;
3528 struct ForeignAddressList *fal;
3529 struct OwnAddressList *oal;
3530 struct TransportPlugin *tp;
3531 struct GNUNET_MessageHeader *prem;
3537 ps = ntohs (pong->header.size);
3538 if (ps < sizeof (struct TransportPongMessage))
3540 GNUNET_break_op (0);
3543 addr = (const char*) &pong[1];
3544 slen = strlen (ve->transport_name) + 1;
3545 if ( (ps - sizeof (struct TransportPongMessage) < slen) ||
3546 (ve->challenge != challenge) ||
3547 (addr[slen-1] != '\0') ||
3548 (0 != strcmp (addr, ve->transport_name)) ||
3549 (ntohl (pong->purpose.size)
3550 != sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3552 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3553 sizeof (struct GNUNET_PeerIdentity) + ps - sizeof (struct TransportPongMessage)) )
3558 alen = ps - sizeof (struct TransportPongMessage) - slen;
3559 switch (ntohl (pong->purpose.purpose))
3561 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN:
3562 if ( (ve->addrlen + slen != ntohl (pong->addrlen)) ||
3563 (0 != memcmp (&addr[slen],
3567 return GNUNET_YES; /* different entry, keep trying! */
3569 if (0 != memcmp (&pong->pid,
3571 sizeof (struct GNUNET_PeerIdentity)))
3573 GNUNET_break_op (0);
3577 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
3582 GNUNET_break_op (0);
3587 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3588 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
3590 a2s (ve->transport_name,
3591 (const struct sockaddr *) ve->addr,
3593 ve->transport_name);
3596 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING:
3597 if (0 != memcmp (&pong->pid,
3599 sizeof (struct GNUNET_PeerIdentity)))
3601 GNUNET_break_op (0);
3604 if (ve->addrlen != 0)
3606 /* must have been for a different validation entry */
3609 tp = find_transport (ve->transport_name);
3615 oal = tp->addresses;
3618 if ( (oal->addrlen == alen) &&
3619 (0 == memcmp (&oal[1],
3627 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3628 _("Not accepting PONG with address `%s' since I cannot confirm having this address.\n"),
3629 a2s (ve->transport_name,
3635 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING,
3640 GNUNET_break_op (0);
3645 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3646 "Confirmed that peer `%4s' is talking to us using address `%s' (%s) for us.\n",
3648 a2s (ve->transport_name,
3651 ve->transport_name);
3655 GNUNET_break_op (0);
3658 if (GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value == 0)
3660 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3661 _("Received expired signature. Check system time.\n"));
3664 GNUNET_STATISTICS_update (stats,
3665 gettext_noop ("# address validation successes"),
3668 /* create the updated HELLO */
3669 GNUNET_CRYPTO_hash (&ve->publicKey,
3670 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3671 &target.hashPubKey);
3672 if (ve->addr != NULL)
3674 avac.done = GNUNET_NO;
3676 hello = GNUNET_HELLO_create (&ve->publicKey,
3677 &add_validated_address,
3679 GNUNET_PEERINFO_add_peer (peerinfo,
3681 GNUNET_free (hello);
3683 n = find_neighbour (&target);
3686 n->publicKey = ve->publicKey;
3687 n->public_key_valid = GNUNET_YES;
3688 fal = add_peer_address (n,
3693 GNUNET_assert (fal != NULL);
3694 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
3695 fal->validated = GNUNET_YES;
3696 mark_address_connected (fal);
3697 GNUNET_STATISTICS_update (stats,
3698 gettext_noop ("# peer addresses considered valid"),
3701 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
3702 schedule_next_ping (fal);
3703 if (n->latency.rel_value == GNUNET_TIME_UNIT_FOREVER_REL.rel_value)
3704 n->latency = fal->latency;
3706 n->latency.rel_value = (fal->latency.rel_value + n->latency.rel_value) / 2;
3708 n->distance = fal->distance;
3709 if (GNUNET_NO == n->received_pong)
3711 n->received_pong = GNUNET_YES;
3712 notify_clients_connect (&target, n->latency, n->distance);
3713 if (NULL != (prem = n->pre_connect_message_buffer))
3715 n->pre_connect_message_buffer = NULL;
3716 handle_payload_message (prem, n);
3720 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3722 GNUNET_SCHEDULER_cancel (n->retry_task);
3723 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3724 try_transmission_to_peer (n);
3728 /* clean up validation entry */
3729 GNUNET_assert (GNUNET_YES ==
3730 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3733 abort_validation (NULL, NULL, ve);
3739 * Function that will be called if we receive a validation
3740 * of an address challenge that we transmitted to another
3741 * peer. Note that the validation should only be considered
3742 * acceptable if the challenge matches AND if the sender
3743 * address is at least a plausible address for this peer
3744 * (otherwise we may be seeing a MiM attack).
3746 * @param cls closure
3747 * @param message the pong message
3748 * @param peer who responded to our challenge
3749 * @param sender_address string describing our sender address (as observed
3750 * by the other peer in binary format)
3751 * @param sender_address_len number of bytes in 'sender_address'
3754 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3755 const struct GNUNET_PeerIdentity *peer,
3756 const char *sender_address,
3757 size_t sender_address_len)
3759 #if DEBUG_TRANSPORT > 1
3760 /* we get tons of these that just get discarded, only log
3761 if we are quite verbose */
3762 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3763 "Receiving `%s' message from `%4s'.\n", "PONG",
3766 GNUNET_STATISTICS_update (stats,
3767 gettext_noop ("# PONG messages received"),
3770 if (GNUNET_SYSERR !=
3771 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3773 &check_pending_validation,
3776 /* This is *expected* to happen a lot since we send
3777 PONGs to *all* known addresses of the sender of
3778 the PING, so most likely we get multiple PONGs
3779 per PING, and all but the first PONG will end up
3780 here. So really we should not print anything here
3781 unless we want to be very, very verbose... */
3782 #if DEBUG_TRANSPORT > 2
3783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3784 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3796 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3798 * @param cls the 'struct ValidationEntry*'
3799 * @param neighbour neighbour to validate, NULL if validation failed
3802 transmit_hello_and_ping (void *cls,
3803 struct NeighbourList *neighbour)
3805 struct ValidationEntry *va = cls;
3806 struct ForeignAddressList *peer_address;
3807 struct TransportPingMessage ping;
3808 uint16_t hello_size;
3811 struct GNUNET_PeerIdentity id;
3814 GNUNET_CRYPTO_hash (&va->publicKey,
3815 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3817 if (neighbour == NULL)
3819 /* FIXME: stats... */
3820 GNUNET_break (GNUNET_OK ==
3821 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3824 abort_validation (NULL, NULL, va);
3827 neighbour->publicKey = va->publicKey;
3828 neighbour->public_key_valid = GNUNET_YES;
3829 peer_address = add_peer_address (neighbour,
3830 va->transport_name, NULL,
3831 (const void*) &va[1],
3833 if (peer_address == NULL)
3835 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3836 "Failed to add peer `%4s' for plugin `%s'\n",
3837 GNUNET_i2s (&neighbour->id),
3838 va->transport_name);
3839 GNUNET_break (GNUNET_OK ==
3840 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3843 abort_validation (NULL, NULL, va);
3846 hello_size = GNUNET_HELLO_size(our_hello);
3847 slen = strlen(va->transport_name) + 1;
3848 tsize = sizeof(struct TransportPingMessage) + hello_size + va->addrlen + slen;
3849 message_buf = GNUNET_malloc(tsize);
3850 ping.challenge = htonl(va->challenge);
3851 ping.header.size = htons(sizeof(struct TransportPingMessage) + slen + va->addrlen);
3852 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3853 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3854 memcpy(message_buf, our_hello, hello_size);
3855 memcpy(&message_buf[hello_size],
3857 sizeof(struct TransportPingMessage));
3858 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3861 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3866 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3869 : a2s (va->transport_name,
3870 (const void*) &va[1], va->addrlen),
3872 GNUNET_i2s (&neighbour->id),
3873 "HELLO", hello_size,
3874 "PING", sizeof (struct TransportPingMessage) + va->addrlen + slen);
3877 GNUNET_STATISTICS_update (stats,
3878 gettext_noop ("# PING messages sent for initial validation"),
3881 transmit_to_peer (NULL, peer_address,
3882 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3883 HELLO_VERIFICATION_TIMEOUT,
3885 GNUNET_YES, neighbour);
3886 GNUNET_free(message_buf);
3891 * Check if the given address is already being validated; if not,
3892 * append the given address to the list of entries that are being be
3893 * validated and initiate validation.
3895 * @param cls closure ('struct CheckHelloValidatedContext *')
3896 * @param tname name of the transport
3897 * @param expiration expiration time
3898 * @param addr the address
3899 * @param addrlen length of the address
3900 * @return GNUNET_OK (always)
3903 run_validation (void *cls,
3905 struct GNUNET_TIME_Absolute expiration,
3909 struct CheckHelloValidatedContext *chvc = cls;
3910 struct GNUNET_PeerIdentity id;
3911 struct TransportPlugin *tp;
3912 struct ValidationEntry *va;
3913 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3914 struct CheckAddressExistsClosure caec;
3915 struct OwnAddressList *oal;
3917 GNUNET_assert (addr != NULL);
3919 GNUNET_STATISTICS_update (stats,
3920 gettext_noop ("# peer addresses scheduled for validation"),
3923 tp = find_transport (tname);
3926 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3927 GNUNET_ERROR_TYPE_BULK,
3929 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3931 GNUNET_STATISTICS_update (stats,
3932 gettext_noop ("# peer addresses not validated (plugin not available)"),
3937 /* check if this is one of our own addresses */
3938 oal = tp->addresses;
3941 if ( (oal->addrlen == addrlen) &&
3942 (0 == memcmp (&oal[1],
3946 /* not plausible, this address is equivalent to our own address! */
3947 GNUNET_STATISTICS_update (stats,
3948 gettext_noop ("# peer addresses not validated (loopback)"),
3955 GNUNET_HELLO_get_key (chvc->hello, &pk);
3956 GNUNET_CRYPTO_hash (&pk,
3958 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3961 if (is_blacklisted(&id, tp))
3964 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3965 "Attempted to validate blacklisted peer `%s' using `%s'!\n",
3973 caec.addrlen = addrlen;
3974 caec.session = NULL;
3976 caec.exists = GNUNET_NO;
3977 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3978 &check_address_exists,
3980 if (caec.exists == GNUNET_YES)
3982 /* During validation attempts we will likely trigger the other
3983 peer trying to validate our address which in turn will cause
3984 it to send us its HELLO, so we expect to hit this case rather
3985 frequently. Only print something if we are very verbose. */
3986 #if DEBUG_TRANSPORT > 1
3987 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3988 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3989 a2s (tname, addr, addrlen),
3993 GNUNET_STATISTICS_update (stats,
3994 gettext_noop ("# peer addresses not validated (in progress)"),
3999 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
4002 va->transport_name = GNUNET_strdup (tname);
4003 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
4005 va->send_time = GNUNET_TIME_absolute_get();
4006 va->addr = (const void*) &va[1];
4007 memcpy (&va[1], addr, addrlen);
4008 va->addrlen = addrlen;
4009 GNUNET_HELLO_get_key (chvc->hello,
4011 va->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_VERIFICATION_TIMEOUT,
4012 &timeout_hello_validation,
4014 GNUNET_CONTAINER_multihashmap_put (validation_map,
4017 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
4018 setup_peer_check_blacklist (&id, GNUNET_NO,
4019 &transmit_hello_and_ping,
4026 * Check if addresses in validated hello "h" overlap with
4027 * those in "chvc->hello" and validate the rest.
4029 * @param cls closure
4030 * @param peer id of the peer, NULL for last call
4031 * @param h hello message for the peer (can be NULL)
4034 check_hello_validated (void *cls,
4035 const struct GNUNET_PeerIdentity *peer,
4036 const struct GNUNET_HELLO_Message *h)
4038 struct CheckHelloValidatedContext *chvc = cls;
4039 struct GNUNET_HELLO_Message *plain_hello;
4040 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
4041 struct GNUNET_PeerIdentity target;
4042 struct NeighbourList *n;
4046 GNUNET_STATISTICS_update (stats,
4047 gettext_noop ("# outstanding peerinfo iterate requests"),
4051 if (GNUNET_NO == chvc->hello_known)
4053 /* notify PEERINFO about the peer now, so that we at least
4054 have the public key if some other component needs it */
4055 GNUNET_HELLO_get_key (chvc->hello, &pk);
4056 GNUNET_CRYPTO_hash (&pk,
4057 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4058 &target.hashPubKey);
4059 plain_hello = GNUNET_HELLO_create (&pk,
4062 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
4063 GNUNET_free (plain_hello);
4064 #if DEBUG_TRANSPORT_HELLO
4065 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4066 "PEERINFO had no `%s' message for peer `%4s', full validation needed.\n",
4068 GNUNET_i2s (&target));
4070 GNUNET_STATISTICS_update (stats,
4071 gettext_noop ("# new HELLOs requiring full validation"),
4074 GNUNET_HELLO_iterate_addresses (chvc->hello,
4081 GNUNET_STATISTICS_update (stats,
4082 gettext_noop ("# duplicate HELLO (peer known)"),
4087 if (chvc->ve_count == 0)
4089 GNUNET_CONTAINER_DLL_remove (chvc_head,
4098 #if DEBUG_TRANSPORT_HELLO
4099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4100 "PEERINFO had `%s' message for peer `%4s', validating only new addresses.\n",
4104 chvc->hello_known = GNUNET_YES;
4105 n = find_neighbour (peer);
4108 #if DEBUG_TRANSPORT_HELLO
4109 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4110 "Calling hello_iterate_addresses for %s!\n",
4113 GNUNET_HELLO_iterate_addresses (h,
4115 &add_to_foreign_address_list,
4117 try_transmission_to_peer (n);
4121 #if DEBUG_TRANSPORT_HELLO
4122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4123 "No existing neighbor record for %s!\n",
4126 GNUNET_STATISTICS_update (stats,
4127 gettext_noop ("# no existing neighbour record (validating HELLO)"),
4131 GNUNET_STATISTICS_update (stats,
4132 gettext_noop ("# HELLO validations (update case)"),
4135 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
4137 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
4144 * Process HELLO-message.
4146 * @param plugin transport involved, may be NULL
4147 * @param message the actual message
4148 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
4151 process_hello (struct TransportPlugin *plugin,
4152 const struct GNUNET_MessageHeader *message)
4155 struct GNUNET_PeerIdentity target;
4156 const struct GNUNET_HELLO_Message *hello;
4157 struct CheckHelloValidatedContext *chvc;
4158 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
4159 #if DEBUG_TRANSPORT_HELLO > 2
4162 hsize = ntohs (message->size);
4163 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
4164 (hsize < sizeof (struct GNUNET_MessageHeader)))
4167 return GNUNET_SYSERR;
4169 GNUNET_STATISTICS_update (stats,
4170 gettext_noop ("# HELLOs received for validation"),
4174 /* first, check if load is too high */
4175 if (GNUNET_SCHEDULER_get_load (GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
4177 GNUNET_STATISTICS_update (stats,
4178 gettext_noop ("# HELLOs ignored due to high load"),
4181 #if DEBUG_TRANSPORT_HELLO
4182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4183 "Ignoring `%s' for `%4s', load too high.\n",
4185 GNUNET_i2s (&target));
4189 hello = (const struct GNUNET_HELLO_Message *) message;
4190 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
4192 #if DEBUG_TRANSPORT_HELLO
4193 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4194 "Unable to get public key from `%s' for `%4s'!\n",
4196 GNUNET_i2s (&target));
4198 GNUNET_break_op (0);
4199 return GNUNET_SYSERR;
4202 GNUNET_CRYPTO_hash (&publicKey,
4203 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4204 &target.hashPubKey);
4206 #if DEBUG_TRANSPORT_HELLO
4207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4208 "Received `%s' message for `%4s'\n",
4210 GNUNET_i2s (&target));
4213 if (0 == memcmp (&my_identity,
4215 sizeof (struct GNUNET_PeerIdentity)))
4217 GNUNET_STATISTICS_update (stats,
4218 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
4224 while (NULL != chvc)
4226 if (GNUNET_HELLO_equals (hello,
4228 GNUNET_TIME_absolute_get ()).abs_value > 0)
4230 #if DEBUG_TRANSPORT_HELLO > 2
4231 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4232 "Received duplicate `%s' message for `%4s'; ignored\n",
4234 GNUNET_i2s (&target));
4236 return GNUNET_OK; /* validation already pending */
4238 if (GNUNET_HELLO_size(hello) == GNUNET_HELLO_size (chvc->hello))
4239 GNUNET_break (0 != memcmp (hello, chvc->hello,
4240 GNUNET_HELLO_size(hello)));
4245 struct NeighbourList *temp_neighbor = find_neighbour(&target);
4246 if ((NULL != temp_neighbor))
4248 fprintf(stderr, "Already know peer, ignoring hello\n");
4253 #if DEBUG_TRANSPORT_HELLO > 2
4256 my_id = GNUNET_strdup(GNUNET_i2s(plugin->env.my_identity));
4257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4258 "%s: Starting validation of `%s' message for `%4s' via '%s' of size %u\n",
4261 GNUNET_i2s (&target),
4263 GNUNET_HELLO_size(hello));
4267 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
4269 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
4270 memcpy (&chvc[1], hello, hsize);
4271 GNUNET_CONTAINER_DLL_insert (chvc_head,
4274 /* finally, check if HELLO was previously validated
4275 (continuation will then schedule actual validation) */
4276 GNUNET_STATISTICS_update (stats,
4277 gettext_noop ("# peerinfo process hello iterate requests"),
4280 GNUNET_STATISTICS_update (stats,
4281 gettext_noop ("# outstanding peerinfo iterate requests"),
4284 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
4286 HELLO_VERIFICATION_TIMEOUT,
4287 &check_hello_validated, chvc);
4293 * The peer specified by the given neighbour has timed-out or a plugin
4294 * has disconnected. We may either need to do nothing (other plugins
4295 * still up), or trigger a full disconnect and clean up. This
4296 * function updates our state and does the necessary notifications.
4297 * Also notifies our clients that the neighbour is now officially
4300 * @param n the neighbour list entry for the peer
4301 * @param check GNUNET_YES to check if ALL addresses for this peer
4302 * are gone, GNUNET_NO to force a disconnect of the peer
4303 * regardless of whether other addresses exist.
4306 disconnect_neighbour (struct NeighbourList *n, int check)
4308 struct ReadyList *rpos;
4309 struct NeighbourList *npos;
4310 struct NeighbourList *nprev;
4311 struct MessageQueue *mq;
4312 struct ForeignAddressList *peer_addresses;
4313 struct ForeignAddressList *peer_pos;
4315 if (GNUNET_YES == check)
4318 while (NULL != rpos)
4320 peer_addresses = rpos->addresses;
4321 while (peer_addresses != NULL)
4323 if (GNUNET_YES == peer_addresses->connected)
4325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4326 "NOT Disconnecting from `%4s', still have live addresses!\n",
4327 GNUNET_i2s (&n->id));
4328 return; /* still connected */
4330 peer_addresses = peer_addresses->next;
4336 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4337 "Disconnecting from `%4s'\n",
4338 GNUNET_i2s (&n->id));
4340 /* remove n from neighbours list */
4343 while ((npos != NULL) && (npos != n))
4348 GNUNET_assert (npos != NULL);
4350 neighbours = n->next;
4352 nprev->next = n->next;
4354 /* notify all clients about disconnect */
4355 if (GNUNET_YES == n->received_pong)
4356 notify_clients_disconnect (&n->id);
4358 /* clean up all plugins, cancel connections and pending transmissions */
4359 while (NULL != (rpos = n->plugins))
4361 n->plugins = rpos->next;
4362 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
4363 while (rpos->addresses != NULL)
4365 peer_pos = rpos->addresses;
4366 rpos->addresses = peer_pos->next;
4367 if (peer_pos->connected == GNUNET_YES)
4368 GNUNET_STATISTICS_update (stats,
4369 gettext_noop ("# connected addresses"),
4372 if (GNUNET_YES == peer_pos->validated)
4373 GNUNET_STATISTICS_update (stats,
4374 gettext_noop ("# peer addresses considered valid"),
4377 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
4379 GNUNET_SCHEDULER_cancel (peer_pos->revalidate_task);
4380 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
4382 GNUNET_free(peer_pos);
4387 /* free all messages on the queue */
4388 while (NULL != (mq = n->messages_head))
4390 GNUNET_STATISTICS_update (stats,
4391 gettext_noop ("# bytes in message queue for other peers"),
4392 - (int64_t) mq->message_buf_size,
4394 GNUNET_STATISTICS_update (stats,
4395 gettext_noop ("# bytes discarded due to disconnect"),
4396 mq->message_buf_size,
4398 GNUNET_CONTAINER_DLL_remove (n->messages_head,
4401 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
4403 sizeof(struct GNUNET_PeerIdentity)));
4406 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
4408 GNUNET_SCHEDULER_cancel (n->timeout_task);
4409 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
4411 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
4413 GNUNET_SCHEDULER_cancel (n->retry_task);
4414 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
4416 if (n->piter != NULL)
4418 GNUNET_PEERINFO_iterate_cancel (n->piter);
4419 GNUNET_STATISTICS_update (stats,
4420 gettext_noop ("# outstanding peerinfo iterate requests"),
4425 /* finally, free n itself */
4426 GNUNET_STATISTICS_update (stats,
4427 gettext_noop ("# active neighbours"),
4430 GNUNET_free_non_null (n->pre_connect_message_buffer);
4436 * We have received a PING message from someone. Need to send a PONG message
4437 * in response to the peer by any means necessary.
4440 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
4441 const struct GNUNET_PeerIdentity *peer,
4442 struct Session *session,
4443 const char *sender_address,
4444 uint16_t sender_address_len)
4446 struct TransportPlugin *plugin = cls;
4447 struct SessionHeader *session_header = (struct SessionHeader*) session;
4448 struct TransportPingMessage *ping;
4449 struct TransportPongMessage *pong;
4450 struct NeighbourList *n;
4451 struct ReadyList *rl;
4452 struct ForeignAddressList *fal;
4453 struct OwnAddressList *oal;
4458 if (ntohs (message->size) < sizeof (struct TransportPingMessage))
4460 GNUNET_break_op (0);
4461 return GNUNET_SYSERR;
4464 ping = (struct TransportPingMessage *) message;
4465 if (0 != memcmp (&ping->target,
4466 plugin->env.my_identity,
4467 sizeof (struct GNUNET_PeerIdentity)))
4469 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4470 _("Received `%s' message from `%s' destined for `%s' which is not me!\n"),
4472 (sender_address != NULL)
4473 ? a2s (plugin->short_name,
4474 (const struct sockaddr *)sender_address,
4477 GNUNET_i2s (&ping->target));
4478 return GNUNET_SYSERR;
4481 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4482 "Processing `%s' from `%s'\n",
4484 (sender_address != NULL)
4485 ? a2s (plugin->short_name,
4486 (const struct sockaddr *)sender_address,
4490 GNUNET_STATISTICS_update (stats,
4491 gettext_noop ("# PING messages received"),
4494 addr = (const char*) &ping[1];
4495 alen = ntohs (message->size) - sizeof (struct TransportPingMessage);
4496 slen = strlen (plugin->short_name) + 1;
4499 /* peer wants to confirm that we have an outbound connection to him */
4500 if (session == NULL)
4502 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4503 _("Refusing to create PONG since I do not have a session with `%s'.\n"),
4505 return GNUNET_SYSERR;
4507 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4508 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4509 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4510 pong->purpose.size =
4511 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4513 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4514 sizeof (struct GNUNET_PeerIdentity) + sender_address_len + slen);
4515 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING);
4516 pong->challenge = ping->challenge;
4517 pong->addrlen = htonl(sender_address_len + slen);
4520 sizeof(struct GNUNET_PeerIdentity));
4524 if ((sender_address!=NULL) && (sender_address_len > 0))
4525 memcpy (&((char*)&pong[1])[slen],
4527 sender_address_len);
4528 if (GNUNET_TIME_absolute_get_remaining (session_header->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4)
4530 /* create / update cached sig */
4532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4533 "Creating PONG signature to indicate active connection.\n");
4535 session_header->pong_sig_expires = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
4536 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4537 GNUNET_assert (GNUNET_OK ==
4538 GNUNET_CRYPTO_rsa_sign (my_private_key,
4540 &session_header->pong_signature));
4544 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4546 memcpy (&pong->signature,
4547 &session_header->pong_signature,
4548 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4554 /* peer wants to confirm that this is one of our addresses */
4558 plugin->api->check_address (plugin->api->cls,
4562 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4563 _("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
4564 a2s (plugin->short_name,
4569 oal = plugin->addresses;
4572 if ( (oal->addrlen == alen) &&
4579 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
4580 pong->header.size = htons (sizeof (struct TransportPongMessage) + alen + slen);
4581 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4582 pong->purpose.size =
4583 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4585 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4586 sizeof (struct GNUNET_PeerIdentity) + alen + slen);
4587 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
4588 pong->challenge = ping->challenge;
4589 pong->addrlen = htonl(alen + slen);
4592 sizeof(struct GNUNET_PeerIdentity));
4593 memcpy (&pong[1], plugin->short_name, slen);
4594 memcpy (&((char*)&pong[1])[slen], addr, alen);
4595 if ( (oal != NULL) &&
4596 (GNUNET_TIME_absolute_get_remaining (oal->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4) )
4598 /* create / update cached sig */
4600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4601 "Creating PONG signature to indicate ownership.\n");
4603 oal->pong_sig_expires = GNUNET_TIME_absolute_min (oal->expires,
4604 GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4605 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4606 GNUNET_assert (GNUNET_OK ==
4607 GNUNET_CRYPTO_rsa_sign (my_private_key,
4609 &oal->pong_signature));
4610 memcpy (&pong->signature,
4611 &oal->pong_signature,
4612 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4614 else if (oal == NULL)
4616 /* not using cache (typically DV-only) */
4617 pong->expiration = GNUNET_TIME_absolute_hton (GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4618 GNUNET_assert (GNUNET_OK ==
4619 GNUNET_CRYPTO_rsa_sign (my_private_key,
4625 /* can used cached version */
4626 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4627 memcpy (&pong->signature,
4628 &oal->pong_signature,
4629 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4632 n = find_neighbour(peer);
4633 GNUNET_assert (n != NULL);
4634 /* first try reliable response transmission */
4638 fal = rl->addresses;
4641 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4644 ntohs (pong->header.size),
4645 TRANSPORT_PONG_PRIORITY,
4646 HELLO_VERIFICATION_TIMEOUT,
4654 GNUNET_STATISTICS_update (stats,
4655 gettext_noop ("# PONGs unicast via reliable transport"),
4665 /* no reliable method found, do multicast */
4666 GNUNET_STATISTICS_update (stats,
4667 gettext_noop ("# PONGs multicast to all available addresses"),
4673 fal = rl->addresses;
4676 transmit_to_peer(NULL, fal,
4677 TRANSPORT_PONG_PRIORITY,
4678 HELLO_VERIFICATION_TIMEOUT,
4680 ntohs(pong->header.size),
4693 * Function called by the plugin for each received message.
4694 * Update data volumes, possibly notify plugins about
4695 * reducing the rate at which they read from the socket
4696 * and generally forward to our receive callback.
4698 * @param cls the "struct TransportPlugin *" we gave to the plugin
4699 * @param peer (claimed) identity of the other peer
4700 * @param message the message, NULL if we only care about
4701 * learning about the delay until we should receive again
4702 * @param ats information for automatic transport selection
4703 * @param ats_count number of elements in ats not including 0-terminator
4704 * @param session identifier used for this session (can be NULL)
4705 * @param sender_address binary address of the sender (if observed)
4706 * @param sender_address_len number of bytes in sender_address
4707 * @return how long in ms the plugin should wait until receiving more data
4708 * (plugins that do not support this, can ignore the return value)
4710 static struct GNUNET_TIME_Relative
4711 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4712 const struct GNUNET_MessageHeader *message,
4713 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4715 struct Session *session,
4716 const char *sender_address,
4717 uint16_t sender_address_len)
4719 struct TransportPlugin *plugin = cls;
4720 struct ReadyList *service_context;
4721 struct ForeignAddressList *peer_address;
4723 struct NeighbourList *n;
4724 struct GNUNET_TIME_Relative ret;
4725 if (is_blacklisted (peer, plugin))
4726 return GNUNET_TIME_UNIT_FOREVER_REL;
4730 n = find_neighbour (peer);
4732 n = setup_new_neighbour (peer, GNUNET_YES);
4733 service_context = n->plugins;
4734 while ((service_context != NULL) && (plugin != service_context->plugin))
4735 service_context = service_context->next;
4736 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4737 peer_address = NULL;
4739 for (c=0; c<ats_count; c++)
4741 if (ntohl(ats[c].type) == GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE)
4743 distance = ntohl(ats[c].value);
4747 if (message != NULL)
4749 if ( (session != NULL) ||
4750 (sender_address != NULL) )
4751 peer_address = add_peer_address (n,
4755 sender_address_len);
4756 if (peer_address != NULL)
4758 peer_address->distance = distance;
4759 if (GNUNET_YES == peer_address->validated)
4760 mark_address_connected (peer_address);
4761 peer_address->timeout
4763 GNUNET_TIME_relative_to_absolute
4764 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4765 schedule_next_ping (peer_address);
4767 /* update traffic received amount ... */
4768 msize = ntohs (message->size);
4769 GNUNET_STATISTICS_update (stats,
4770 gettext_noop ("# bytes received from other peers"),
4773 n->distance = distance;
4775 GNUNET_TIME_relative_to_absolute
4776 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4777 GNUNET_SCHEDULER_cancel (n->timeout_task);
4779 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4780 &neighbour_timeout_task, n);
4781 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4783 /* dropping message due to frequent inbound volume violations! */
4784 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4785 GNUNET_ERROR_TYPE_BULK,
4787 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4788 n->in_tracker.available_bytes_per_s__,
4789 n->quota_violation_count);
4790 GNUNET_STATISTICS_update (stats,
4791 gettext_noop ("# bandwidth quota violations by other peers"),
4794 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4798 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4799 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
4800 ntohs (message->type),
4801 ntohs (message->size),
4804 switch (ntohs (message->type))
4806 case GNUNET_MESSAGE_TYPE_HELLO:
4807 GNUNET_STATISTICS_update (stats,
4808 gettext_noop ("# HELLO messages received from other peers"),
4811 process_hello (plugin, message);
4813 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4814 handle_ping (plugin, message, peer, session, sender_address, sender_address_len);
4816 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4817 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4820 handle_payload_message (message, n);
4824 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4825 if (ret.rel_value > 0)
4827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4828 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4829 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4830 (unsigned int) n->in_tracker.available_bytes_per_s__,
4831 (unsigned long long) ret.rel_value);
4832 GNUNET_STATISTICS_update (stats,
4833 gettext_noop ("# ms throttling suggested"),
4834 (int64_t) ret.rel_value,
4841 * Handle START-message. This is the first message sent to us
4842 * by any client which causes us to add it to our list.
4844 * @param cls closure (always NULL)
4845 * @param client identification of the client
4846 * @param message the actual message
4849 handle_start (void *cls,
4850 struct GNUNET_SERVER_Client *client,
4851 const struct GNUNET_MessageHeader *message)
4853 const struct StartMessage *start;
4854 struct TransportClient *c;
4855 struct ConnectInfoMessage * cim;
4856 struct NeighbourList *n;
4860 start = (const struct StartMessage*) message;
4862 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4863 "Received `%s' request from client\n", "START");
4868 if (c->client == client)
4870 /* client already on our list! */
4872 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4877 if ( (GNUNET_NO != ntohl (start->do_check)) &&
4878 (0 != memcmp (&start->self,
4880 sizeof (struct GNUNET_PeerIdentity))) )
4882 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4883 _("Rejecting control connection from peer `%s', which is not me!\n"),
4884 GNUNET_i2s (&start->self));
4885 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4888 c = GNUNET_malloc (sizeof (struct TransportClient));
4892 if (our_hello != NULL)
4895 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4896 "Sending our own `%s' to new client\n", "HELLO");
4898 transmit_to_client (c,
4899 (const struct GNUNET_MessageHeader *) our_hello,
4901 /* tell new client about all existing connections */
4903 size = sizeof (struct ConnectInfoMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
4904 if (size > GNUNET_SERVER_MAX_MESSAGE_SIZE)
4908 cim = GNUNET_malloc (size);
4909 cim->header.size = htons (size);
4910 cim->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4911 cim->ats_count = htonl(ats_count);
4912 (&(cim->ats))[2].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
4913 (&(cim->ats))[2].value = htonl (0);
4917 if (GNUNET_YES == n->received_pong)
4919 (&(cim->ats))[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
4920 (&(cim->ats))[0].value = htonl (n->distance);
4921 (&(cim->ats))[1].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY);
4922 (&(cim->ats))[1].value = htonl ((uint32_t) n->latency.rel_value);
4924 transmit_to_client (c, &cim->header, GNUNET_NO);
4930 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4935 * Handle HELLO-message.
4937 * @param cls closure (always NULL)
4938 * @param client identification of the client
4939 * @param message the actual message
4942 handle_hello (void *cls,
4943 struct GNUNET_SERVER_Client *client,
4944 const struct GNUNET_MessageHeader *message)
4948 GNUNET_STATISTICS_update (stats,
4949 gettext_noop ("# HELLOs received from clients"),
4952 ret = process_hello (NULL, message);
4953 GNUNET_SERVER_receive_done (client, ret);
4958 * Closure for 'transmit_client_message'; followed by
4959 * 'msize' bytes of the actual message.
4961 struct TransmitClientMessageContext
4964 * Client on whom's behalf we are sending.
4966 struct GNUNET_SERVER_Client *client;
4969 * Timeout for the transmission.
4971 struct GNUNET_TIME_Absolute timeout;
4979 * Size of the message in bytes.
4986 * Schedule transmission of a message we got from a client to a peer.
4988 * @param cls the 'struct TransmitClientMessageContext*'
4989 * @param n destination, or NULL on error (in that case, drop the message)
4992 transmit_client_message (void *cls,
4993 struct NeighbourList *n)
4995 struct TransmitClientMessageContext *tcmc = cls;
4996 struct TransportClient *tc;
4999 while ((tc != NULL) && (tc->client != tcmc->client))
5004 transmit_to_peer (tc, NULL, tcmc->priority,
5005 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
5007 tcmc->msize, GNUNET_NO, n);
5009 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
5010 GNUNET_SERVER_client_drop (tcmc->client);
5016 * Handle SEND-message.
5018 * @param cls closure (always NULL)
5019 * @param client identification of the client
5020 * @param message the actual message
5023 handle_send (void *cls,
5024 struct GNUNET_SERVER_Client *client,
5025 const struct GNUNET_MessageHeader *message)
5027 const struct OutboundMessage *obm;
5028 const struct GNUNET_MessageHeader *obmm;
5029 struct TransmitClientMessageContext *tcmc;
5033 size = ntohs (message->size);
5035 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
5038 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5041 GNUNET_STATISTICS_update (stats,
5042 gettext_noop ("# payload received for other peers"),
5045 obm = (const struct OutboundMessage *) message;
5046 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
5047 msize = size - sizeof (struct OutboundMessage);
5049 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5050 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
5051 "SEND", GNUNET_i2s (&obm->peer),
5055 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
5056 tcmc->client = client;
5057 tcmc->priority = ntohl (obm->priority);
5058 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
5059 tcmc->msize = msize;
5060 /* FIXME: this memcpy can be up to 7% of our total runtime */
5061 memcpy (&tcmc[1], obmm, msize);
5062 GNUNET_SERVER_client_keep (client);
5063 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
5064 &transmit_client_message,
5070 * Handle request connect message
5072 * @param cls closure (always NULL)
5073 * @param client identification of the client
5074 * @param message the actual message
5077 handle_request_connect (void *cls,
5078 struct GNUNET_SERVER_Client *client,
5079 const struct GNUNET_MessageHeader *message)
5081 const struct TransportRequestConnectMessage *trcm =
5082 (const struct TransportRequestConnectMessage *) message;
5084 GNUNET_STATISTICS_update (stats,
5085 gettext_noop ("# REQUEST CONNECT messages received"),
5088 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received a request connect message for peer %s\n", GNUNET_i2s(&trcm->peer));
5089 setup_peer_check_blacklist (&trcm->peer, GNUNET_YES,
5091 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5095 * Handle SET_QUOTA-message.
5097 * @param cls closure (always NULL)
5098 * @param client identification of the client
5099 * @param message the actual message
5102 handle_set_quota (void *cls,
5103 struct GNUNET_SERVER_Client *client,
5104 const struct GNUNET_MessageHeader *message)
5106 const struct QuotaSetMessage *qsm =
5107 (const struct QuotaSetMessage *) message;
5108 struct NeighbourList *n;
5110 GNUNET_STATISTICS_update (stats,
5111 gettext_noop ("# SET QUOTA messages received"),
5114 n = find_neighbour (&qsm->peer);
5117 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5118 GNUNET_STATISTICS_update (stats,
5119 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
5125 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5126 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
5128 (unsigned int) ntohl (qsm->quota.value__),
5129 (unsigned int) n->in_tracker.available_bytes_per_s__,
5130 GNUNET_i2s (&qsm->peer));
5132 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
5134 if (0 == ntohl (qsm->quota.value__))
5136 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5137 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&n->id),
5139 disconnect_neighbour (n, GNUNET_NO);
5141 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5146 * Take the given address and append it to the set of results sent back to
5149 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
5150 * @param address the resolved name, NULL to indicate the last response
5153 transmit_address_to_client (void *cls, const char *address)
5155 struct GNUNET_SERVER_TransmitContext *tc = cls;
5158 if (NULL == address)
5161 slen = strlen (address) + 1;
5163 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
5164 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5165 if (NULL == address)
5166 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
5171 * Handle AddressLookup-message.
5173 * @param cls closure (always NULL)
5174 * @param client identification of the client
5175 * @param message the actual message
5178 handle_address_lookup (void *cls,
5179 struct GNUNET_SERVER_Client *client,
5180 const struct GNUNET_MessageHeader *message)
5182 const struct AddressLookupMessage *alum;
5183 struct TransportPlugin *lsPlugin;
5184 const char *nameTransport;
5185 const char *address;
5187 struct GNUNET_SERVER_TransmitContext *tc;
5188 struct GNUNET_TIME_Absolute timeout;
5189 struct GNUNET_TIME_Relative rtimeout;
5192 size = ntohs (message->size);
5193 if (size < sizeof (struct AddressLookupMessage))
5195 GNUNET_break_op (0);
5196 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5199 alum = (const struct AddressLookupMessage *) message;
5200 uint32_t addressLen = ntohl (alum->addrlen);
5201 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
5203 GNUNET_break_op (0);
5204 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5207 address = (const char *) &alum[1];
5208 nameTransport = (const char *) &address[addressLen];
5210 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
5212 GNUNET_break_op (0);
5213 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5216 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
5217 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
5218 numeric = ntohl (alum->numeric_only);
5219 lsPlugin = find_transport (nameTransport);
5220 if (NULL == lsPlugin)
5222 tc = GNUNET_SERVER_transmit_context_create (client);
5223 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
5224 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5225 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
5228 tc = GNUNET_SERVER_transmit_context_create (client);
5229 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
5231 address, addressLen,
5234 &transmit_address_to_client, tc);
5239 * Setup the environment for this plugin.
5242 create_environment (struct TransportPlugin *plug)
5244 plug->env.cfg = cfg;
5245 plug->env.my_identity = &my_identity;
5246 plug->env.our_hello = &our_hello;
5247 plug->env.cls = plug;
5248 plug->env.receive = &plugin_env_receive;
5249 plug->env.notify_address = &plugin_env_notify_address;
5250 plug->env.session_end = &plugin_env_session_end;
5251 plug->env.max_connections = max_connect_per_transport;
5252 plug->env.stats = stats;
5257 * Start the specified transport (load the plugin).
5260 start_transport (struct GNUNET_SERVER_Handle *server,
5263 struct TransportPlugin *plug;
5266 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5267 _("Loading `%s' transport plugin\n"), name);
5268 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
5269 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
5270 create_environment (plug);
5271 plug->short_name = GNUNET_strdup (name);
5272 plug->lib_name = libname;
5273 plug->next = plugins;
5275 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
5276 if (plug->api == NULL)
5278 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5279 _("Failed to load transport plugin for `%s'\n"), name);
5280 GNUNET_free (plug->short_name);
5281 plugins = plug->next;
5282 GNUNET_free (libname);
5289 * Called whenever a client is disconnected. Frees our
5290 * resources associated with that client.
5292 * @param cls closure
5293 * @param client identification of the client
5296 client_disconnect_notification (void *cls,
5297 struct GNUNET_SERVER_Client *client)
5299 struct TransportClient *pos;
5300 struct TransportClient *prev;
5301 struct ClientMessageQueueEntry *mqe;
5302 struct Blacklisters *bl;
5303 struct BlacklistCheck *bc;
5308 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
5309 "Client disconnected, cleaning up.\n");
5311 /* clean up blacklister */
5315 if (bl->client == client)
5320 if (bc->bl_pos == bl)
5322 bc->bl_pos = bl->next;
5325 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
5328 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
5329 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
5335 GNUNET_CONTAINER_DLL_remove (bl_head,
5338 GNUNET_SERVER_client_drop (bl->client);
5344 /* clean up 'normal' clients */
5347 while ((pos != NULL) && (pos->client != client))
5354 while (NULL != (mqe = pos->message_queue_head))
5356 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
5357 pos->message_queue_tail,
5359 pos->message_count--;
5363 clients = pos->next;
5365 prev->next = pos->next;
5366 if (GNUNET_YES == pos->tcs_pending)
5371 if (pos->th != NULL)
5373 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
5376 GNUNET_break (0 == pos->message_count);
5382 * Function called when the service shuts down. Unloads our plugins
5383 * and cancels pending validations.
5385 * @param cls closure, unused
5386 * @param tc task context (unused)
5389 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5391 struct TransportPlugin *plug;
5392 struct OwnAddressList *al;
5393 struct CheckHelloValidatedContext *chvc;
5395 while (neighbours != NULL)
5397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5398 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&neighbours->id),
5400 disconnect_neighbour (neighbours, GNUNET_NO);
5403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5404 "Transport service is unloading plugins...\n");
5406 while (NULL != (plug = plugins))
5408 plugins = plug->next;
5409 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
5411 GNUNET_SCHEDULER_cancel (plug->address_update_task);
5412 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
5414 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
5415 GNUNET_free (plug->lib_name);
5416 GNUNET_free (plug->short_name);
5417 while (NULL != (al = plug->addresses))
5419 plug->addresses = al->next;
5424 if (my_private_key != NULL)
5425 GNUNET_CRYPTO_rsa_key_free (my_private_key);
5426 GNUNET_free_non_null (our_hello);
5428 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
5431 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5432 validation_map = NULL;
5434 /* free 'chvc' data structure */
5435 while (NULL != (chvc = chvc_head))
5437 chvc_head = chvc->next;
5438 if (chvc->piter != NULL)
5440 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
5441 GNUNET_STATISTICS_update (stats,
5442 gettext_noop ("# outstanding peerinfo iterate requests"),
5448 GNUNET_assert (chvc->ve_count == 0);
5455 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5458 if (peerinfo != NULL)
5460 GNUNET_PEERINFO_disconnect (peerinfo);
5463 /* Can we assume those are gone by now, or do we need to clean up
5465 GNUNET_break (bl_head == NULL);
5466 GNUNET_break (bc_head == NULL);
5471 * Initiate transport service.
5473 * @param cls closure
5474 * @param server the initialized server
5475 * @param c configuration to use
5479 struct GNUNET_SERVER_Handle *server,
5480 const struct GNUNET_CONFIGURATION_Handle *c)
5482 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
5483 {&handle_start, NULL,
5484 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
5485 {&handle_hello, NULL,
5486 GNUNET_MESSAGE_TYPE_HELLO, 0},
5487 {&handle_send, NULL,
5488 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
5489 {&handle_request_connect, NULL,
5490 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT, sizeof(struct TransportRequestConnectMessage)},
5491 {&handle_set_quota, NULL,
5492 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
5493 {&handle_address_lookup, NULL,
5494 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
5496 {&handle_blacklist_init, NULL,
5497 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
5498 {&handle_blacklist_reply, NULL,
5499 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
5505 unsigned long long tneigh;
5509 stats = GNUNET_STATISTICS_create ("transport", cfg);
5510 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
5511 /* parse configuration */
5513 GNUNET_CONFIGURATION_get_value_number (c,
5518 GNUNET_CONFIGURATION_get_value_filename (c,
5520 "HOSTKEY", &keyfile)))
5522 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5524 ("Transport service is lacking key configuration settings. Exiting.\n"));
5525 GNUNET_SCHEDULER_shutdown ();
5528 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5531 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5532 validation_map = NULL;
5535 max_connect_per_transport = (uint32_t) tneigh;
5536 peerinfo = GNUNET_PEERINFO_connect (cfg);
5537 if (peerinfo == NULL)
5539 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5540 _("Could not access PEERINFO service. Exiting.\n"));
5541 GNUNET_SCHEDULER_shutdown ();
5544 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5547 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5548 validation_map = NULL;
5549 GNUNET_free (keyfile);
5552 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
5553 GNUNET_free (keyfile);
5554 if (my_private_key == NULL)
5556 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5558 ("Transport service could not access hostkey. Exiting.\n"));
5559 GNUNET_SCHEDULER_shutdown ();
5562 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5565 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5566 validation_map = NULL;
5569 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
5570 GNUNET_CRYPTO_hash (&my_public_key,
5571 sizeof (my_public_key), &my_identity.hashPubKey);
5572 /* setup notification */
5573 GNUNET_SERVER_disconnect_notify (server,
5574 &client_disconnect_notification, NULL);
5575 /* load plugins... */
5578 GNUNET_CONFIGURATION_get_value_string (c,
5579 "TRANSPORT", "PLUGINS", &plugs))
5581 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5582 _("Starting transport plugins `%s'\n"), plugs);
5583 pos = strtok (plugs, " ");
5586 start_transport (server, pos);
5588 pos = strtok (NULL, " ");
5590 GNUNET_free (plugs);
5592 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
5593 &shutdown_task, NULL);
5598 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
5600 /* If we have a blacklist file, read from it */
5601 read_blacklist_file(cfg);
5602 /* process client requests */
5603 GNUNET_SERVER_add_handlers (server, handlers);
5608 * The main function for the transport service.
5610 * @param argc number of arguments from the command line
5611 * @param argv command line arguments
5612 * @return 0 ok, 1 on error
5615 main (int argc, char *const *argv)
5617 a2s (NULL, NULL, 0); /* make compiler happy */
5618 return (GNUNET_OK ==
5619 GNUNET_SERVICE_run (argc,
5622 GNUNET_SERVICE_OPTION_NONE,
5623 &run, NULL)) ? 0 : 1;
5626 /* end of gnunet-service-transport.c */