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
1383 * @param result status code for the transmission request
1386 transmit_send_ok (struct TransportClient *client,
1387 struct NeighbourList *n,
1390 struct SendOkMessage send_ok_msg;
1392 send_ok_msg.header.size = htons (sizeof (send_ok_msg));
1393 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
1394 send_ok_msg.success = htonl (result);
1395 send_ok_msg.latency = GNUNET_TIME_relative_hton (n->latency);
1396 send_ok_msg.peer = n->id;
1397 transmit_to_client (client, &send_ok_msg.header, GNUNET_NO);
1402 * Function called by the GNUNET_TRANSPORT_TransmitFunction
1403 * upon "completion" of a send request. This tells the API
1404 * that it is now legal to send another message to the given
1407 * @param cls closure, identifies the entry on the
1408 * message queue that was transmitted and the
1409 * client responsible for queuing the message
1410 * @param target the peer receiving the message
1411 * @param result GNUNET_OK on success, if the transmission
1412 * failed, we should not tell the client to transmit
1416 transmit_send_continuation (void *cls,
1417 const struct GNUNET_PeerIdentity *target,
1420 struct MessageQueue *mq = cls;
1421 struct NeighbourList *n;
1423 GNUNET_STATISTICS_update (stats,
1424 gettext_noop ("# bytes pending with plugins"),
1425 - (int64_t) mq->message_buf_size,
1427 if (result == GNUNET_OK)
1429 GNUNET_STATISTICS_update (stats,
1430 gettext_noop ("# bytes successfully transmitted by plugins"),
1431 mq->message_buf_size,
1436 GNUNET_STATISTICS_update (stats,
1437 gettext_noop ("# bytes with transmission failure by plugins"),
1438 mq->message_buf_size,
1441 n = find_neighbour(&mq->neighbour_id);
1442 GNUNET_assert (n != NULL);
1443 if (mq->specific_address != NULL)
1445 if (result == GNUNET_OK)
1447 mq->specific_address->timeout =
1448 GNUNET_TIME_relative_to_absolute
1449 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
1450 if (mq->specific_address->validated == GNUNET_YES)
1451 mark_address_connected (mq->specific_address);
1455 if (mq->specific_address->connected != GNUNET_NO)
1458 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1459 "Marking address `%s' as no longer connected (due to transmission problem)\n",
1460 a2s (mq->specific_address->ready_list->plugin->short_name,
1461 mq->specific_address->addr,
1462 mq->specific_address->addrlen));
1464 GNUNET_STATISTICS_update (stats,
1465 gettext_noop ("# connected addresses"),
1468 mq->specific_address->connected = GNUNET_NO;
1471 if (! mq->internal_msg)
1472 mq->specific_address->in_transmit = GNUNET_NO;
1474 if (mq->client != NULL)
1475 transmit_send_ok (mq->client, n, result);
1477 try_transmission_to_peer (n);
1482 * Find an address in any of the available transports for
1483 * the given neighbour that would be good for message
1484 * transmission. This is essentially the transport selection
1487 * @param neighbour for whom to select an address
1488 * @return selected address, NULL if we have none
1490 struct ForeignAddressList *
1491 find_ready_address(struct NeighbourList *neighbour)
1493 struct ReadyList *head = neighbour->plugins;
1494 struct ForeignAddressList *addresses;
1495 struct GNUNET_TIME_Absolute now = GNUNET_TIME_absolute_get ();
1496 struct ForeignAddressList *best_address;
1498 best_address = NULL;
1499 while (head != NULL)
1501 addresses = head->addresses;
1502 while (addresses != NULL)
1504 if ( (addresses->timeout.abs_value < now.abs_value) &&
1505 (addresses->connected == GNUNET_YES) )
1508 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1509 "Marking long-time inactive connection to `%4s' as down.\n",
1510 GNUNET_i2s (&neighbour->id));
1512 GNUNET_STATISTICS_update (stats,
1513 gettext_noop ("# connected addresses"),
1516 addresses->connected = GNUNET_NO;
1518 addresses = addresses->next;
1521 addresses = head->addresses;
1522 while (addresses != NULL)
1524 #if DEBUG_TRANSPORT > 1
1525 if (addresses->addr != NULL)
1526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1527 "Have address `%s' for peer `%4s' (status: %d, %d, %d, %u, %llums, %u)\n",
1528 a2s (head->plugin->short_name,
1530 addresses->addrlen),
1531 GNUNET_i2s (&neighbour->id),
1532 addresses->connected,
1533 addresses->in_transmit,
1534 addresses->validated,
1535 addresses->connect_attempts,
1536 (unsigned long long) addresses->timeout.abs_value,
1537 (unsigned int) addresses->distance);
1539 if ( ( (best_address == NULL) ||
1540 (addresses->connected == GNUNET_YES) ||
1541 (best_address->connected == GNUNET_NO) ) &&
1542 (addresses->in_transmit == GNUNET_NO) &&
1543 ( (best_address == NULL) ||
1544 (addresses->latency.rel_value < best_address->latency.rel_value)) )
1545 best_address = addresses;
1546 /* FIXME: also give lower-latency addresses that are not
1547 connected a chance some times... */
1548 addresses = addresses->next;
1552 if (best_address != NULL)
1555 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1556 "Best address found (`%s') has latency of %llu ms.\n",
1557 (best_address->addrlen > 0)
1558 ? a2s (best_address->ready_list->plugin->short_name,
1560 best_address->addrlen)
1562 best_address->latency.rel_value);
1567 GNUNET_STATISTICS_update (stats,
1568 gettext_noop ("# transmission attempts failed (no address)"),
1572 return best_address;
1578 * We should re-try transmitting to the given peer,
1579 * hopefully we've learned something in the meantime.
1582 retry_transmission_task (void *cls,
1583 const struct GNUNET_SCHEDULER_TaskContext *tc)
1585 struct NeighbourList *n = cls;
1587 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
1588 try_transmission_to_peer (n);
1593 * Check the ready list for the given neighbour and if a plugin is
1594 * ready for transmission (and if we have a message), do so!
1596 * @param neighbour target peer for which to transmit
1599 try_transmission_to_peer (struct NeighbourList *neighbour)
1601 struct ReadyList *rl;
1602 struct MessageQueue *mq;
1603 struct GNUNET_TIME_Relative timeout;
1607 if (neighbour->messages_head == NULL)
1610 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1611 "Transmission queue for `%4s' is empty\n",
1612 GNUNET_i2s (&neighbour->id));
1614 return; /* nothing to do */
1617 mq = neighbour->messages_head;
1618 force_address = GNUNET_YES;
1619 if (mq->specific_address == NULL)
1621 mq->specific_address = find_ready_address(neighbour);
1622 GNUNET_STATISTICS_update (stats,
1623 gettext_noop ("# transport selected peer address freely"),
1626 force_address = GNUNET_NO;
1628 if (mq->specific_address == NULL)
1630 GNUNET_STATISTICS_update (stats,
1631 gettext_noop ("# transport failed to selected peer address"),
1634 timeout = GNUNET_TIME_absolute_get_remaining (mq->timeout);
1635 if (timeout.rel_value == 0)
1638 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1639 "No destination address available to transmit message of size %u to peer `%4s'\n",
1640 mq->message_buf_size,
1641 GNUNET_i2s (&mq->neighbour_id));
1643 GNUNET_STATISTICS_update (stats,
1644 gettext_noop ("# bytes in message queue for other peers"),
1645 - (int64_t) mq->message_buf_size,
1647 GNUNET_STATISTICS_update (stats,
1648 gettext_noop ("# bytes discarded (no destination address available)"),
1649 mq->message_buf_size,
1651 if (mq->client != NULL)
1652 transmit_send_ok (mq->client, neighbour, GNUNET_NO);
1653 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1654 neighbour->messages_tail,
1657 return; /* nobody ready */
1659 GNUNET_STATISTICS_update (stats,
1660 gettext_noop ("# message delivery deferred (no address)"),
1663 if (neighbour->retry_task != GNUNET_SCHEDULER_NO_TASK)
1664 GNUNET_SCHEDULER_cancel (neighbour->retry_task);
1665 neighbour->retry_task = GNUNET_SCHEDULER_add_delayed (timeout,
1666 &retry_transmission_task,
1669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1670 "No validated destination address available to transmit message of size %u to peer `%4s', will wait %llums to find an address.\n",
1671 mq->message_buf_size,
1672 GNUNET_i2s (&mq->neighbour_id),
1675 /* FIXME: might want to trigger peerinfo lookup here
1676 (unless that's already pending...) */
1679 GNUNET_CONTAINER_DLL_remove (neighbour->messages_head,
1680 neighbour->messages_tail,
1682 if (mq->specific_address->connected == GNUNET_NO)
1683 mq->specific_address->connect_attempts++;
1684 rl = mq->specific_address->ready_list;
1685 mq->plugin = rl->plugin;
1686 if (!mq->internal_msg)
1687 mq->specific_address->in_transmit = GNUNET_YES;
1689 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1690 "Sending message of size %u for `%4s' to `%s' via plugin `%s'\n",
1691 mq->message_buf_size,
1692 GNUNET_i2s (&neighbour->id),
1693 (mq->specific_address->addr != NULL)
1694 ? a2s (mq->plugin->short_name,
1695 mq->specific_address->addr,
1696 mq->specific_address->addrlen)
1698 rl->plugin->short_name);
1700 GNUNET_STATISTICS_update (stats,
1701 gettext_noop ("# bytes in message queue for other peers"),
1702 - (int64_t) mq->message_buf_size,
1704 GNUNET_STATISTICS_update (stats,
1705 gettext_noop ("# bytes pending with plugins"),
1706 mq->message_buf_size,
1708 ret = rl->plugin->api->send (rl->plugin->api->cls,
1711 mq->message_buf_size,
1713 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
1714 mq->specific_address->session,
1715 mq->specific_address->addr,
1716 mq->specific_address->addrlen,
1718 &transmit_send_continuation, mq);
1721 /* failure, but 'send' would not call continuation in this case,
1722 so we need to do it here! */
1723 transmit_send_continuation (mq,
1731 * Send the specified message to the specified peer.
1733 * @param client source of the transmission request (can be NULL)
1734 * @param peer_address ForeignAddressList where we should send this message
1735 * @param priority how important is the message
1736 * @param timeout how long do we have to transmit?
1737 * @param message_buf message(s) to send GNUNET_MessageHeader(s)
1738 * @param message_buf_size total size of all messages in message_buf
1739 * @param is_internal is this an internal message; these are pre-pended and
1740 * also do not count for plugins being "ready" to transmit
1741 * @param neighbour handle to the neighbour for transmission
1744 transmit_to_peer (struct TransportClient *client,
1745 struct ForeignAddressList *peer_address,
1746 unsigned int priority,
1747 struct GNUNET_TIME_Relative timeout,
1748 const char *message_buf,
1749 size_t message_buf_size,
1750 int is_internal, struct NeighbourList *neighbour)
1752 struct MessageQueue *mq;
1757 /* check for duplicate submission */
1758 mq = neighbour->messages_head;
1761 if (mq->client == client)
1763 /* client transmitted to same peer twice
1764 before getting SEND_OK! */
1772 GNUNET_STATISTICS_update (stats,
1773 gettext_noop ("# bytes in message queue for other peers"),
1776 mq = GNUNET_malloc (sizeof (struct MessageQueue) + message_buf_size);
1777 mq->specific_address = peer_address;
1778 mq->client = client;
1779 /* FIXME: this memcpy can be up to 7% of our total runtime! */
1780 memcpy (&mq[1], message_buf, message_buf_size);
1781 mq->message_buf = (const char*) &mq[1];
1782 mq->message_buf_size = message_buf_size;
1783 memcpy(&mq->neighbour_id, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
1784 mq->internal_msg = is_internal;
1785 mq->priority = priority;
1786 mq->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1788 GNUNET_CONTAINER_DLL_insert (neighbour->messages_head,
1789 neighbour->messages_tail,
1792 GNUNET_CONTAINER_DLL_insert_after (neighbour->messages_head,
1793 neighbour->messages_tail,
1794 neighbour->messages_tail,
1796 try_transmission_to_peer (neighbour);
1803 struct GeneratorContext
1805 struct TransportPlugin *plug_pos;
1806 struct OwnAddressList *addr_pos;
1807 struct GNUNET_TIME_Absolute expiration;
1815 address_generator (void *cls, size_t max, void *buf)
1817 struct GeneratorContext *gc = cls;
1820 while ((gc->addr_pos == NULL) && (gc->plug_pos != NULL))
1822 gc->plug_pos = gc->plug_pos->next;
1823 gc->addr_pos = (gc->plug_pos != NULL) ? gc->plug_pos->addresses : NULL;
1825 if (NULL == gc->plug_pos)
1830 ret = GNUNET_HELLO_add_address (gc->plug_pos->short_name,
1833 gc->addr_pos->addrlen, buf, max);
1834 gc->addr_pos = gc->addr_pos->next;
1840 * Construct our HELLO message from all of the addresses of
1841 * all of the transports.
1846 struct GNUNET_HELLO_Message *hello;
1847 struct TransportClient *cpos;
1848 struct NeighbourList *npos;
1849 struct GeneratorContext gc;
1851 gc.plug_pos = plugins;
1852 gc.addr_pos = plugins != NULL ? plugins->addresses : NULL;
1853 gc.expiration = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1854 hello = GNUNET_HELLO_create (&my_public_key, &address_generator, &gc);
1856 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1857 "Refreshed my `%s', new size is %d\n", "HELLO", GNUNET_HELLO_size(hello));
1859 GNUNET_STATISTICS_update (stats,
1860 gettext_noop ("# refreshed my HELLO"),
1864 while (cpos != NULL)
1866 transmit_to_client (cpos,
1867 (const struct GNUNET_MessageHeader *) hello,
1872 GNUNET_free_non_null (our_hello);
1874 GNUNET_PEERINFO_add_peer (peerinfo, our_hello);
1876 while (npos != NULL)
1879 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
1880 "Transmitting updated `%s' to neighbour `%4s'\n",
1881 "HELLO", GNUNET_i2s (&npos->id));
1883 GNUNET_STATISTICS_update (stats,
1884 gettext_noop ("# transmitted my HELLO to other peers"),
1887 transmit_to_peer (NULL, NULL, 0,
1888 HELLO_ADDRESS_EXPIRATION,
1889 (const char *) our_hello,
1890 GNUNET_HELLO_size(our_hello),
1898 * Task used to clean up expired addresses for a plugin.
1900 * @param cls closure
1904 expire_address_task (void *cls,
1905 const struct GNUNET_SCHEDULER_TaskContext *tc);
1909 * Update the list of addresses for this plugin,
1910 * expiring those that are past their expiration date.
1912 * @param plugin addresses of which plugin should be recomputed?
1913 * @param fresh set to GNUNET_YES if a new address was added
1914 * and we need to regenerate the HELLO even if nobody
1918 update_addresses (struct TransportPlugin *plugin,
1921 static struct GNUNET_TIME_Absolute last_update;
1922 struct GNUNET_TIME_Relative min_remaining;
1923 struct GNUNET_TIME_Relative remaining;
1924 struct GNUNET_TIME_Absolute now;
1925 struct OwnAddressList *pos;
1926 struct OwnAddressList *prev;
1927 struct OwnAddressList *next;
1930 if (plugin->address_update_task != GNUNET_SCHEDULER_NO_TASK)
1931 GNUNET_SCHEDULER_cancel (plugin->address_update_task);
1932 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1933 now = GNUNET_TIME_absolute_get ();
1934 min_remaining = GNUNET_TIME_UNIT_FOREVER_REL;
1935 expired = (GNUNET_TIME_absolute_get_duration (last_update).rel_value > (HELLO_ADDRESS_EXPIRATION.rel_value / 4));
1937 pos = plugin->addresses;
1941 if (pos->expires.abs_value < now.abs_value)
1943 expired = GNUNET_YES;
1945 plugin->addresses = pos->next;
1947 prev->next = pos->next;
1952 remaining = GNUNET_TIME_absolute_get_remaining (pos->expires);
1953 if (remaining.rel_value < min_remaining.rel_value)
1954 min_remaining = remaining;
1960 if (expired || fresh)
1965 min_remaining = GNUNET_TIME_relative_min (min_remaining,
1966 GNUNET_TIME_relative_divide (HELLO_ADDRESS_EXPIRATION,
1968 plugin->address_update_task
1969 = GNUNET_SCHEDULER_add_delayed (min_remaining,
1970 &expire_address_task, plugin);
1975 * Task used to clean up expired addresses for a plugin.
1977 * @param cls closure
1981 expire_address_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1983 struct TransportPlugin *plugin = cls;
1985 plugin->address_update_task = GNUNET_SCHEDULER_NO_TASK;
1986 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1987 update_addresses (plugin, GNUNET_NO);
1992 * Iterator over hash map entries that NULLs the session of validation
1993 * entries that match the given session.
1995 * @param cls closure (the 'struct Session*' to match against)
1996 * @param key current key code (peer ID, not used)
1997 * @param value value in the hash map ('struct ValidationEntry*')
1998 * @return GNUNET_YES (we should continue to iterate)
2001 remove_session_validations (void *cls,
2002 const GNUNET_HashCode * key,
2005 struct Session *session = cls;
2006 struct ValidationEntry *ve = value;
2008 if (session == ve->session)
2015 * We've been disconnected from the other peer (for some
2016 * connection-oriented transport). Either quickly
2017 * re-establish the connection or signal the disconnect
2020 * Only signal CORE level disconnect if ALL addresses
2021 * for the peer are exhausted.
2023 * @param p overall plugin context
2024 * @param nl neighbour that was disconnected
2027 try_fast_reconnect (struct TransportPlugin *p,
2028 struct NeighbourList *nl)
2030 /* FIXME-MW: fast reconnect / transport switching not implemented... */
2031 /* Note: the idea here is to hide problems with transports (or
2032 switching between plugins) from the core to eliminate the need to
2033 re-negotiate session keys and the like; OTOH, we should tell core
2034 quickly (much faster than timeout) `if a connection was lost and
2035 could not be re-established (i.e. other peer went down or is
2036 unable / refuses to communicate);
2038 So we should consider:
2039 1) ideally: our own willingness / need to connect
2040 2) prior failures to connect to this peer (by plugin)
2041 3) ideally: reasons why other peer terminated (as far as knowable)
2043 Most importantly, it must be POSSIBLE for another peer to terminate
2044 a connection for a while (without us instantly re-establishing it).
2045 Similarly, if another peer is gone we should quickly notify CORE.
2046 OTOH, if there was a minor glitch (i.e. crash of gnunet-service-transport
2047 on the other end), we should reconnect in such a way that BOTH CORE
2048 services never even notice.
2049 Furthermore, the same mechanism (or small variation) could be used
2050 to switch to a better-performing plugin (ATS).
2052 Finally, this needs to be tested throughly... */
2055 * GNUNET_NO in the call below makes transport disconnect the peer,
2056 * even if only a single address (out of say, six) went away. This
2057 * function must be careful to ONLY disconnect if the peer is gone,
2058 * not just a specifi address.
2060 * More specifically, half the places it was used had it WRONG.
2063 /* No reconnect, signal disconnect instead! */
2064 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2065 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&nl->id),
2066 "try_fast_reconnect");
2067 disconnect_neighbour (nl, GNUNET_YES);
2072 * Function that will be called whenever the plugin internally
2073 * cleans up a session pointer and hence the service needs to
2074 * discard all of those sessions as well. Plugins that do not
2075 * use sessions can simply omit calling this function and always
2076 * use NULL wherever a session pointer is needed.
2078 * @param cls closure
2079 * @param peer which peer was the session for
2080 * @param session which session is being destoyed
2083 plugin_env_session_end (void *cls,
2084 const struct GNUNET_PeerIdentity *peer,
2085 struct Session *session)
2087 struct TransportPlugin *p = cls;
2088 struct NeighbourList *nl;
2089 struct ReadyList *rl;
2090 struct ForeignAddressList *pos;
2091 struct ForeignAddressList *prev;
2093 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
2094 &remove_session_validations,
2096 nl = find_neighbour (peer);
2098 return; /* was never marked as connected */
2102 if (rl->plugin == p)
2107 return; /* was never marked as connected */
2109 pos = rl->addresses;
2110 while ( (pos != NULL) &&
2111 (pos->session != session) )
2117 return; /* was never marked as connected */
2118 pos->session = NULL;
2119 if (pos->addrlen != 0)
2121 if (nl->received_pong != GNUNET_NO)
2122 try_fast_reconnect (p, nl);
2125 /* was inbound connection, free 'pos' */
2127 rl->addresses = pos->next;
2129 prev->next = pos->next;
2130 if (GNUNET_SCHEDULER_NO_TASK != pos->revalidate_task)
2132 GNUNET_SCHEDULER_cancel (pos->revalidate_task);
2133 pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
2136 if (nl->received_pong == GNUNET_NO)
2137 return; /* nothing to do, never connected... */
2138 /* check if we have any validated addresses left */
2139 pos = rl->addresses;
2144 try_fast_reconnect (p, nl);
2149 /* no valid addresses left, signal disconnect! */
2151 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2152 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&nl->id),
2153 "plugin_env_session_end");
2154 /* FIXME: This doesn't mean there are no addresses left for this PEER,
2155 * it means there aren't any left for this PLUGIN/PEER combination! So
2156 * calling disconnect_neighbor here with GNUNET_NO forces disconnect
2157 * when it isn't necessary. Using GNUNET_YES at least checks to see
2158 * if there are any addresses that work first, so as not to overdo it.
2161 disconnect_neighbour (nl, GNUNET_YES);
2166 * Function that must be called by each plugin to notify the
2167 * transport service about the addresses under which the transport
2168 * provided by the plugin can be reached.
2170 * @param cls closure
2171 * @param name name of the transport that generated the address
2172 * @param addr one of the addresses of the host, NULL for the last address
2173 * the specific address format depends on the transport
2174 * @param addrlen length of the address
2175 * @param expires when should this address automatically expire?
2178 plugin_env_notify_address (void *cls,
2182 struct GNUNET_TIME_Relative expires)
2184 struct TransportPlugin *p = cls;
2185 struct OwnAddressList *al;
2186 struct GNUNET_TIME_Absolute abex;
2188 GNUNET_assert (addr != NULL);
2189 abex = GNUNET_TIME_relative_to_absolute (expires);
2190 GNUNET_assert (p == find_transport (name));
2194 if ((addrlen == al->addrlen) && (0 == memcmp (addr, &al[1], addrlen)))
2197 update_addresses (p, GNUNET_NO);
2203 al = GNUNET_malloc (sizeof (struct OwnAddressList) + addrlen);
2204 al->next = p->addresses;
2207 al->addrlen = addrlen;
2208 memcpy (&al[1], addr, addrlen);
2209 update_addresses (p, GNUNET_YES);
2214 * Notify all of our clients about a peer connecting.
2217 notify_clients_connect (const struct GNUNET_PeerIdentity *peer,
2218 struct GNUNET_TIME_Relative latency,
2221 struct ConnectInfoMessage * cim;
2222 struct TransportClient *cpos;
2227 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2228 "Notifying clients about connection from `%s'\n",
2231 GNUNET_STATISTICS_update (stats,
2232 gettext_noop ("# peers connected"),
2237 size = sizeof (struct ConnectInfoMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
2238 if (size > GNUNET_SERVER_MAX_MESSAGE_SIZE)
2242 cim = GNUNET_malloc (size);
2244 cim->header.size = htons (size);
2245 cim->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
2246 cim->ats_count = htonl(2);
2247 (&(cim->ats))[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
2248 (&(cim->ats))[0].value = htonl (distance);
2249 (&(cim->ats))[1].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY);
2250 (&(cim->ats))[1].value = htonl ((uint32_t) latency.rel_value);
2251 (&(cim->ats))[2].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
2252 (&(cim->ats))[2].value = htonl (0);
2253 memcpy (&cim->id, peer, sizeof (struct GNUNET_PeerIdentity));
2255 while (cpos != NULL)
2257 transmit_to_client (cpos, &(cim->header), GNUNET_NO);
2265 * Notify all of our clients about a peer disconnecting.
2268 notify_clients_disconnect (const struct GNUNET_PeerIdentity *peer)
2270 struct DisconnectInfoMessage dim;
2271 struct TransportClient *cpos;
2274 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2275 "Notifying clients about lost connection to `%s'\n",
2278 GNUNET_STATISTICS_update (stats,
2279 gettext_noop ("# peers connected"),
2282 dim.header.size = htons (sizeof (struct DisconnectInfoMessage));
2283 dim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
2284 dim.reserved = htonl (0);
2285 memcpy (&dim.peer, peer, sizeof (struct GNUNET_PeerIdentity));
2287 while (cpos != NULL)
2289 transmit_to_client (cpos, &dim.header, GNUNET_NO);
2296 * Find a ForeignAddressList entry for the given neighbour
2297 * that matches the given address and transport.
2299 * @param neighbour which peer we care about
2300 * @param tname name of the transport plugin
2301 * @param session session to look for, NULL for 'any'; otherwise
2302 * can be used for the service to "learn" this session ID
2304 * @param addr binary address
2305 * @param addrlen length of addr
2306 * @return NULL if no such entry exists
2308 static struct ForeignAddressList *
2309 find_peer_address(struct NeighbourList *neighbour,
2311 struct Session *session,
2315 struct ReadyList *head;
2316 struct ForeignAddressList *pos;
2318 head = neighbour->plugins;
2319 while (head != NULL)
2321 if (0 == strcmp (tname, head->plugin->short_name))
2327 pos = head->addresses;
2328 while ( (pos != NULL) &&
2329 ( (pos->addrlen != addrlen) ||
2330 (memcmp(pos->addr, addr, addrlen) != 0) ) )
2332 if ( (session != NULL) &&
2333 (pos->session == session) )
2337 if ( (session != NULL) && (pos != NULL) )
2338 pos->session = session; /* learn it! */
2344 * Get the peer address struct for the given neighbour and
2345 * address. If it doesn't yet exist, create it.
2347 * @param neighbour which peer we care about
2348 * @param tname name of the transport plugin
2349 * @param session session of the plugin, or NULL for none
2350 * @param addr binary address
2351 * @param addrlen length of addr
2352 * @return NULL if we do not have a transport plugin for 'tname'
2354 static struct ForeignAddressList *
2355 add_peer_address (struct NeighbourList *neighbour,
2357 struct Session *session,
2361 struct ReadyList *head;
2362 struct ForeignAddressList *ret;
2364 ret = find_peer_address (neighbour, tname, session, addr, addrlen);
2367 head = neighbour->plugins;
2369 while (head != NULL)
2371 if (0 == strcmp (tname, head->plugin->short_name))
2377 ret = GNUNET_malloc(sizeof(struct ForeignAddressList) + addrlen);
2378 ret->session = session;
2381 ret->addr = (const char*) &ret[1];
2382 memcpy (&ret[1], addr, addrlen);
2388 ret->addrlen = addrlen;
2389 ret->expires = GNUNET_TIME_relative_to_absolute
2390 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2391 ret->latency = GNUNET_TIME_relative_get_forever();
2393 ret->timeout = GNUNET_TIME_relative_to_absolute
2394 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2395 ret->ready_list = head;
2396 ret->next = head->addresses;
2397 head->addresses = ret;
2403 * Closure for 'add_validated_address'.
2405 struct AddValidatedAddressContext
2408 * Entry that has been validated.
2410 const struct ValidationEntry *ve;
2413 * Flag set after we have added the address so
2414 * that we terminate the iteration next time.
2421 * Callback function used to fill a buffer of max bytes with a list of
2422 * addresses in the format used by HELLOs. Should use
2423 * "GNUNET_HELLO_add_address" as a helper function.
2425 * @param cls the 'struct AddValidatedAddressContext' with the validated address
2426 * @param max maximum number of bytes that can be written to buf
2427 * @param buf where to write the address information
2428 * @return number of bytes written, 0 to signal the
2429 * end of the iteration.
2432 add_validated_address (void *cls,
2433 size_t max, void *buf)
2435 struct AddValidatedAddressContext *avac = cls;
2436 const struct ValidationEntry *ve = avac->ve;
2438 if (GNUNET_YES == avac->done)
2440 avac->done = GNUNET_YES;
2441 return GNUNET_HELLO_add_address (ve->transport_name,
2442 GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION),
2452 * Closure for 'check_address_exists'.
2454 struct CheckAddressExistsClosure
2457 * Address to check for.
2462 * Name of the transport.
2469 struct Session *session;
2472 * Set to GNUNET_YES if the address exists.
2485 * Iterator over hash map entries. Checks if the given
2486 * validation entry is for the same address as what is given
2489 * @param cls the 'struct CheckAddressExistsClosure*'
2490 * @param key current key code (ignored)
2491 * @param value value in the hash map ('struct ValidationEntry')
2492 * @return GNUNET_YES if we should continue to
2493 * iterate (mismatch), GNUNET_NO if not (entry matched)
2496 check_address_exists (void *cls,
2497 const GNUNET_HashCode * key,
2500 struct CheckAddressExistsClosure *caec = cls;
2501 struct ValidationEntry *ve = value;
2503 if ( (0 == strcmp (caec->tname,
2504 ve->transport_name)) &&
2505 (caec->addrlen == ve->addrlen) &&
2506 (0 == memcmp (caec->addr,
2510 caec->exists = GNUNET_YES;
2513 if ( (ve->session != NULL) &&
2514 (caec->session == ve->session) )
2516 caec->exists = GNUNET_YES;
2525 * Iterator to free entries in the validation_map.
2527 * @param cls closure (unused)
2528 * @param key current key code
2529 * @param value value in the hash map (validation to abort)
2530 * @return GNUNET_YES (always)
2533 abort_validation (void *cls,
2534 const GNUNET_HashCode * key,
2537 struct ValidationEntry *va = value;
2539 if (GNUNET_SCHEDULER_NO_TASK != va->timeout_task)
2540 GNUNET_SCHEDULER_cancel (va->timeout_task);
2541 GNUNET_free (va->transport_name);
2542 if (va->chvc != NULL)
2544 va->chvc->ve_count--;
2545 if (va->chvc->ve_count == 0)
2547 GNUNET_CONTAINER_DLL_remove (chvc_head,
2550 GNUNET_free (va->chvc);
2560 * HELLO validation cleanup task (validation failed).
2562 * @param cls the 'struct ValidationEntry' that failed
2563 * @param tc scheduler context (unused)
2566 timeout_hello_validation (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2568 struct ValidationEntry *va = cls;
2569 struct GNUNET_PeerIdentity pid;
2571 va->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2572 GNUNET_STATISTICS_update (stats,
2573 gettext_noop ("# address validation timeouts"),
2576 GNUNET_CRYPTO_hash (&va->publicKey,
2578 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
2580 GNUNET_break (GNUNET_OK ==
2581 GNUNET_CONTAINER_multihashmap_remove (validation_map,
2584 abort_validation (NULL, NULL, va);
2589 neighbour_timeout_task (void *cls,
2590 const struct GNUNET_SCHEDULER_TaskContext *tc)
2592 struct NeighbourList *n = cls;
2595 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
2596 "Neighbour `%4s' has timed out!\n", GNUNET_i2s (&n->id));
2598 GNUNET_STATISTICS_update (stats,
2599 gettext_noop ("# disconnects due to timeout"),
2602 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
2603 disconnect_neighbour (n, GNUNET_NO);
2608 * Schedule the job that will cause us to send a PING to the
2609 * foreign address to evaluate its validity and latency.
2611 * @param fal address to PING
2614 schedule_next_ping (struct ForeignAddressList *fal);
2618 * Add the given address to the list of foreign addresses
2619 * available for the given peer (check for duplicates).
2621 * @param cls the respective 'struct NeighbourList' to update
2622 * @param tname name of the transport
2623 * @param expiration expiration time
2624 * @param addr the address
2625 * @param addrlen length of the address
2626 * @return GNUNET_OK (always)
2629 add_to_foreign_address_list (void *cls,
2631 struct GNUNET_TIME_Absolute expiration,
2635 struct NeighbourList *n = cls;
2636 struct ForeignAddressList *fal;
2639 GNUNET_STATISTICS_update (stats,
2640 gettext_noop ("# valid peer addresses returned by PEERINFO"),
2644 fal = find_peer_address (n, tname, NULL, addr, addrlen);
2647 #if DEBUG_TRANSPORT_HELLO
2648 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2649 "Adding address `%s' (%s) for peer `%4s' due to PEERINFO data for %llums.\n",
2650 a2s (tname, addr, addrlen),
2652 GNUNET_i2s (&n->id),
2653 expiration.abs_value);
2655 fal = add_peer_address (n, tname, NULL, addr, addrlen);
2658 GNUNET_STATISTICS_update (stats,
2659 gettext_noop ("# previously validated addresses lacking transport"),
2665 fal->expires = GNUNET_TIME_absolute_max (expiration,
2667 schedule_next_ping (fal);
2673 fal->expires = GNUNET_TIME_absolute_max (expiration,
2678 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2679 "Failed to add new address for `%4s'\n",
2680 GNUNET_i2s (&n->id));
2683 if (fal->validated == GNUNET_NO)
2685 fal->validated = GNUNET_YES;
2686 GNUNET_STATISTICS_update (stats,
2687 gettext_noop ("# peer addresses considered valid"),
2691 if (try == GNUNET_YES)
2693 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2694 "Have new addresses, will try to trigger transmissions.\n");
2695 try_transmission_to_peer (n);
2702 * Add addresses in validated HELLO "h" to the set of addresses
2703 * we have for this peer.
2705 * @param cls closure ('struct NeighbourList*')
2706 * @param peer id of the peer, NULL for last call
2707 * @param h hello message for the peer (can be NULL)
2710 add_hello_for_peer (void *cls,
2711 const struct GNUNET_PeerIdentity *peer,
2712 const struct GNUNET_HELLO_Message *h)
2714 struct NeighbourList *n = cls;
2718 GNUNET_STATISTICS_update (stats,
2719 gettext_noop ("# outstanding peerinfo iterate requests"),
2726 return; /* no HELLO available */
2728 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2729 "Peerinfo had `%s' message for peer `%4s', adding existing addresses.\n",
2733 if (GNUNET_YES != n->public_key_valid)
2735 GNUNET_HELLO_get_key (h, &n->publicKey);
2736 n->public_key_valid = GNUNET_YES;
2738 GNUNET_HELLO_iterate_addresses (h,
2740 &add_to_foreign_address_list,
2746 * Create a fresh entry in our neighbour list for the given peer.
2747 * Will try to transmit our current HELLO to the new neighbour.
2748 * Do not call this function directly, use 'setup_peer_check_blacklist.
2750 * @param peer the peer for which we create the entry
2751 * @param do_hello should we schedule transmitting a HELLO
2752 * @return the new neighbour list entry
2754 static struct NeighbourList *
2755 setup_new_neighbour (const struct GNUNET_PeerIdentity *peer,
2758 struct NeighbourList *n;
2759 struct TransportPlugin *tp;
2760 struct ReadyList *rl;
2763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2764 "Setting up state for neighbour `%4s'\n",
2767 GNUNET_assert (our_hello != NULL);
2768 GNUNET_STATISTICS_update (stats,
2769 gettext_noop ("# active neighbours"),
2772 n = GNUNET_malloc (sizeof (struct NeighbourList));
2773 n->next = neighbours;
2777 GNUNET_TIME_relative_to_absolute
2778 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
2779 GNUNET_BANDWIDTH_tracker_init (&n->in_tracker,
2780 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
2781 MAX_BANDWIDTH_CARRY_S);
2785 if ((tp->api->send != NULL) && (!is_blacklisted(peer, tp)))
2787 rl = GNUNET_malloc (sizeof (struct ReadyList));
2789 rl->next = n->plugins;
2792 rl->addresses = NULL;
2796 n->latency = GNUNET_TIME_UNIT_FOREVER_REL;
2798 n->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2799 &neighbour_timeout_task, n);
2802 GNUNET_STATISTICS_update (stats,
2803 gettext_noop ("# peerinfo new neighbor iterate requests"),
2806 GNUNET_STATISTICS_update (stats,
2807 gettext_noop ("# outstanding peerinfo iterate requests"),
2810 n->piter = GNUNET_PEERINFO_iterate (peerinfo, peer,
2811 GNUNET_TIME_UNIT_FOREVER_REL,
2812 &add_hello_for_peer, n);
2814 GNUNET_STATISTICS_update (stats,
2815 gettext_noop ("# HELLO's sent to new neighbors"),
2818 transmit_to_peer (NULL, NULL, 0,
2819 HELLO_ADDRESS_EXPIRATION,
2820 (const char *) our_hello, GNUNET_HELLO_size(our_hello),
2828 * Function called after we have checked if communicating
2829 * with a given peer is acceptable.
2831 * @param cls closure
2832 * @param n NULL if communication is not acceptable
2834 typedef void (*SetupContinuation)(void *cls,
2835 struct NeighbourList *n);
2839 * Information kept for each client registered to perform
2845 * This is a linked list.
2847 struct Blacklisters *next;
2850 * This is a linked list.
2852 struct Blacklisters *prev;
2855 * Client responsible for this entry.
2857 struct GNUNET_SERVER_Client *client;
2860 * Blacklist check that we're currently performing.
2862 struct BlacklistCheck *bc;
2868 * Head of DLL of blacklisting clients.
2870 static struct Blacklisters *bl_head;
2873 * Tail of DLL of blacklisting clients.
2875 static struct Blacklisters *bl_tail;
2879 * Context we use when performing a blacklist check.
2881 struct BlacklistCheck
2885 * This is a linked list.
2887 struct BlacklistCheck *next;
2890 * This is a linked list.
2892 struct BlacklistCheck *prev;
2895 * Peer being checked.
2897 struct GNUNET_PeerIdentity peer;
2900 * Option for setup neighbour afterwards.
2905 * Continuation to call with the result.
2907 SetupContinuation cont;
2915 * Current transmission request handle for this client, or NULL if no
2916 * request is pending.
2918 struct GNUNET_CONNECTION_TransmitHandle *th;
2921 * Our current position in the blacklisters list.
2923 struct Blacklisters *bl_pos;
2926 * Current task performing the check.
2928 GNUNET_SCHEDULER_TaskIdentifier task;
2933 * Head of DLL of active blacklisting queries.
2935 static struct BlacklistCheck *bc_head;
2938 * Tail of DLL of active blacklisting queries.
2940 static struct BlacklistCheck *bc_tail;
2944 * Perform next action in the blacklist check.
2946 * @param cls the 'struct BlacklistCheck*'
2950 do_blacklist_check (void *cls,
2951 const struct GNUNET_SCHEDULER_TaskContext *tc);
2955 * Transmit blacklist query to the client.
2957 * @param cls the 'struct BlacklistCheck'
2958 * @param size number of bytes allowed
2959 * @param buf where to copy the message
2960 * @return number of bytes copied to buf
2963 transmit_blacklist_message (void *cls,
2967 struct BlacklistCheck *bc = cls;
2968 struct Blacklisters *bl;
2969 struct BlacklistMessage bm;
2974 GNUNET_assert (bc->task == GNUNET_SCHEDULER_NO_TASK);
2975 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
2980 bm.header.size = htons (sizeof (struct BlacklistMessage));
2981 bm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2982 bm.is_allowed = htonl (0);
2984 memcpy (buf, &bm, sizeof (bm));
2985 GNUNET_SERVER_receive_done (bl->client, GNUNET_OK);
2991 * Perform next action in the blacklist check.
2993 * @param cls the 'struct BlacklistCheck*'
2997 do_blacklist_check (void *cls,
2998 const struct GNUNET_SCHEDULER_TaskContext *tc)
3000 struct BlacklistCheck *bc = cls;
3001 struct Blacklisters *bl;
3003 bc->task = GNUNET_SCHEDULER_NO_TASK;
3007 bc->cont (bc->cont_cls,
3008 setup_new_neighbour (&bc->peer, bc->do_hello));
3015 bc->th = GNUNET_SERVER_notify_transmit_ready (bl->client,
3016 sizeof (struct BlacklistMessage),
3017 GNUNET_TIME_UNIT_FOREVER_REL,
3018 &transmit_blacklist_message,
3025 * Obtain a 'struct NeighbourList' for the given peer. If such an entry
3026 * does not yet exist, check the blacklist. If the blacklist says creating
3027 * one is acceptable, create one and call the continuation; otherwise
3028 * call the continuation with NULL.
3030 * @param peer peer to setup or look up a struct NeighbourList for
3031 * @param do_hello should we also schedule sending our HELLO to the peer
3032 * if this is a new record
3033 * @param cont function to call with the 'struct NeigbhbourList*'
3034 * @param cont_cls closure for cont
3037 setup_peer_check_blacklist (const struct GNUNET_PeerIdentity *peer,
3039 SetupContinuation cont,
3042 struct NeighbourList *n;
3043 struct BlacklistCheck *bc;
3045 n = find_neighbour(peer);
3052 if (bl_head == NULL)
3055 cont (cont_cls, setup_new_neighbour (peer, do_hello));
3057 setup_new_neighbour(peer, do_hello);
3060 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3061 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3063 bc->do_hello = do_hello;
3065 bc->cont_cls = cont_cls;
3066 bc->bl_pos = bl_head;
3067 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3073 * Function called with the result of querying a new blacklister about
3074 * it being allowed (or not) to continue to talk to an existing neighbour.
3076 * @param cls the original 'struct NeighbourList'
3077 * @param n NULL if we need to disconnect
3080 confirm_or_drop_neighbour (void *cls,
3081 struct NeighbourList *n)
3083 struct NeighbourList * orig = cls;
3087 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3088 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&orig->id),
3089 "confirm_or_drop_neighboUr");
3090 disconnect_neighbour (orig, GNUNET_NO);
3096 * Handle a request to start a blacklist.
3098 * @param cls closure (always NULL)
3099 * @param client identification of the client
3100 * @param message the actual message
3103 handle_blacklist_init (void *cls,
3104 struct GNUNET_SERVER_Client *client,
3105 const struct GNUNET_MessageHeader *message)
3107 struct Blacklisters *bl;
3108 struct BlacklistCheck *bc;
3109 struct NeighbourList *n;
3114 if (bl->client == client)
3117 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3122 bl = GNUNET_malloc (sizeof (struct Blacklisters));
3123 bl->client = client;
3124 GNUNET_SERVER_client_keep (client);
3125 GNUNET_CONTAINER_DLL_insert_after (bl_head, bl_tail, bl_tail, bl);
3126 /* confirm that all existing connections are OK! */
3130 bc = GNUNET_malloc (sizeof (struct BlacklistCheck));
3131 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
3133 bc->do_hello = GNUNET_NO;
3134 bc->cont = &confirm_or_drop_neighbour;
3137 if (n == neighbours) /* all would wait for the same client, no need to
3138 create more than just the first task right now */
3139 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3147 * Handle a request to blacklist a peer.
3149 * @param cls closure (always NULL)
3150 * @param client identification of the client
3151 * @param message the actual message
3154 handle_blacklist_reply (void *cls,
3155 struct GNUNET_SERVER_Client *client,
3156 const struct GNUNET_MessageHeader *message)
3158 const struct BlacklistMessage *msg = (const struct BlacklistMessage*) message;
3159 struct Blacklisters *bl;
3160 struct BlacklistCheck *bc;
3163 while ( (bl != NULL) &&
3164 (bl->client != client) )
3168 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3173 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
3175 bc->cont (bc->cont_cls, NULL);
3176 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
3181 bc->bl_pos = bc->bl_pos->next;
3182 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3185 /* check if any other bc's are waiting for this blacklister */
3189 if ( (bc->bl_pos == bl) &&
3190 (GNUNET_SCHEDULER_NO_TASK == bc->task) )
3191 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
3199 * Send periodic PING messages to a given foreign address.
3201 * @param cls our 'struct PeriodicValidationContext*'
3202 * @param tc task context
3205 send_periodic_ping (void *cls,
3206 const struct GNUNET_SCHEDULER_TaskContext *tc)
3208 struct ForeignAddressList *peer_address = cls;
3209 struct TransportPlugin *tp;
3210 struct ValidationEntry *va;
3211 struct NeighbourList *neighbour;
3212 struct TransportPingMessage ping;
3213 struct CheckAddressExistsClosure caec;
3215 uint16_t hello_size;
3219 peer_address->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
3220 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
3222 tp = peer_address->ready_list->plugin;
3223 neighbour = peer_address->ready_list->neighbour;
3224 if (GNUNET_YES != neighbour->public_key_valid)
3226 /* no public key yet, try again later */
3227 schedule_next_ping (peer_address);
3230 caec.addr = peer_address->addr;
3231 caec.addrlen = peer_address->addrlen;
3232 caec.tname = tp->short_name;
3233 caec.session = peer_address->session;
3234 caec.exists = GNUNET_NO;
3235 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3236 &check_address_exists,
3238 if (caec.exists == GNUNET_YES)
3240 /* During validation attempts we will likely trigger the other
3241 peer trying to validate our address which in turn will cause
3242 it to send us its HELLO, so we expect to hit this case rather
3243 frequently. Only print something if we are very verbose. */
3244 #if DEBUG_TRANSPORT > 1
3245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3246 "Some validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3247 (peer_address->addr != NULL)
3248 ? a2s (tp->short_name,
3250 peer_address->addrlen)
3253 GNUNET_i2s (&neighbour->id));
3255 schedule_next_ping (peer_address);
3258 va = GNUNET_malloc (sizeof (struct ValidationEntry) + peer_address->addrlen);
3259 va->transport_name = GNUNET_strdup (tp->short_name);
3260 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
3262 va->send_time = GNUNET_TIME_absolute_get();
3263 va->session = peer_address->session;
3264 if (peer_address->addr != NULL)
3266 va->addr = (const void*) &va[1];
3267 memcpy (&va[1], peer_address->addr, peer_address->addrlen);
3268 va->addrlen = peer_address->addrlen;
3270 memcpy(&va->publicKey,
3271 &neighbour->publicKey,
3272 sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3274 va->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_VERIFICATION_TIMEOUT,
3275 &timeout_hello_validation,
3277 GNUNET_CONTAINER_multihashmap_put (validation_map,
3278 &neighbour->id.hashPubKey,
3280 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
3282 if (peer_address->validated != GNUNET_YES)
3283 hello_size = GNUNET_HELLO_size(our_hello);
3287 tsize = sizeof(struct TransportPingMessage) + hello_size;
3289 if (peer_address->addr != NULL)
3291 slen = strlen (tp->short_name) + 1;
3292 tsize += slen + peer_address->addrlen;
3296 slen = 0; /* make gcc happy */
3298 message_buf = GNUNET_malloc(tsize);
3299 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3300 ping.challenge = htonl(va->challenge);
3301 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3302 if (peer_address->validated != GNUNET_YES)
3304 memcpy(message_buf, our_hello, hello_size);
3307 if (peer_address->addr != NULL)
3309 ping.header.size = htons(sizeof(struct TransportPingMessage) +
3310 peer_address->addrlen +
3312 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3315 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3317 peer_address->addrlen);
3321 ping.header.size = htons(sizeof(struct TransportPingMessage));
3324 memcpy(&message_buf[hello_size],
3326 sizeof(struct TransportPingMessage));
3328 #if DEBUG_TRANSPORT_REVALIDATION
3329 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3330 "Performing re-validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s'\n",
3331 (peer_address->addr != NULL)
3332 ? a2s (peer_address->plugin->short_name,
3334 peer_address->addrlen)
3337 GNUNET_i2s (&neighbour->id),
3338 "HELLO", hello_size,
3341 if (peer_address->validated != GNUNET_YES)
3342 GNUNET_STATISTICS_update (stats,
3343 gettext_noop ("# PING with HELLO messages sent"),
3347 GNUNET_STATISTICS_update (stats,
3348 gettext_noop ("# PING without HELLO messages sent"),
3351 GNUNET_STATISTICS_update (stats,
3352 gettext_noop ("# PING messages sent for re-validation"),
3355 transmit_to_peer (NULL, peer_address,
3356 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3357 HELLO_VERIFICATION_TIMEOUT,
3359 GNUNET_YES, neighbour);
3360 GNUNET_free(message_buf);
3361 schedule_next_ping (peer_address);
3366 * Schedule the job that will cause us to send a PING to the
3367 * foreign address to evaluate its validity and latency.
3369 * @param fal address to PING
3372 schedule_next_ping (struct ForeignAddressList *fal)
3374 struct GNUNET_TIME_Relative delay;
3376 if (fal->revalidate_task != GNUNET_SCHEDULER_NO_TASK)
3378 delay = GNUNET_TIME_absolute_get_remaining (fal->expires);
3379 delay.rel_value /= 2; /* do before expiration */
3380 delay = GNUNET_TIME_relative_min (delay,
3381 LATENCY_EVALUATION_MAX_DELAY);
3382 if (GNUNET_YES != fal->estimated)
3384 delay = GNUNET_TIME_UNIT_ZERO;
3385 fal->estimated = GNUNET_YES;
3387 if (GNUNET_YES == fal->connected)
3389 delay = GNUNET_TIME_relative_min (delay,
3390 CONNECTED_LATENCY_EVALUATION_MAX_DELAY);
3392 /* FIXME: also adjust delay based on how close the last
3393 observed latency is to the latency of the best alternative */
3394 /* bound how fast we can go */
3395 delay = GNUNET_TIME_relative_max (delay,
3396 GNUNET_TIME_UNIT_SECONDS);
3397 /* randomize a bit (to avoid doing all at the same time) */
3398 delay.rel_value += GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 1000);
3399 fal->revalidate_task = GNUNET_SCHEDULER_add_delayed(delay,
3400 &send_periodic_ping,
3408 * Function that will be called if we receive some payload
3409 * from another peer.
3411 * @param message the payload
3412 * @param n peer who claimed to be the sender
3415 handle_payload_message (const struct GNUNET_MessageHeader *message,
3416 struct NeighbourList *n)
3418 struct InboundMessage *im;
3419 struct TransportClient *cpos;
3422 msize = ntohs (message->size);
3423 if (n->received_pong == GNUNET_NO)
3425 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3426 "Received message of type %u and size %u from `%4s', but no pong yet!!\n",
3427 ntohs (message->type),
3428 ntohs (message->size),
3429 GNUNET_i2s (&n->id));
3430 GNUNET_free_non_null (n->pre_connect_message_buffer);
3431 n->pre_connect_message_buffer = GNUNET_malloc (msize);
3432 memcpy (n->pre_connect_message_buffer, message, msize);
3437 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3438 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
3439 ntohs (message->type),
3440 ntohs (message->size),
3441 GNUNET_i2s (&n->id));
3443 if (GNUNET_YES == GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3446 n->quota_violation_count++;
3448 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3449 "Bandwidth quota (%u b/s) violation detected (total of %u).\n",
3450 n->in_tracker.available_bytes_per_s__,
3451 n->quota_violation_count);
3453 /* Discount 32k per violation */
3454 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3459 if (n->quota_violation_count > 0)
3461 /* try to add 32k back */
3462 GNUNET_BANDWIDTH_tracker_consume (&n->in_tracker,
3464 n->quota_violation_count--;
3467 GNUNET_STATISTICS_update (stats,
3468 gettext_noop ("# payload received from other peers"),
3471 /* transmit message to all clients */
3472 uint32_t ats_count = 2;
3473 size_t size = sizeof (struct InboundMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information) + msize;
3474 if (size > GNUNET_SERVER_MAX_MESSAGE_SIZE)
3477 im = GNUNET_malloc (size);
3478 im->header.size = htons (size);
3479 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
3481 im->ats_count = htonl(ats_count);
3482 /* Setting ATS data */
3483 (&(im->ats))[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
3484 (&(im->ats))[0].value = htonl (n->distance);
3485 (&(im->ats))[1].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY);
3486 (&(im->ats))[1].value = htonl ((uint32_t) n->latency.rel_value);
3487 (&(im->ats))[ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3488 (&(im->ats))[ats_count].value = htonl (0);
3490 memcpy (&((&(im->ats))[ats_count+1]), message, msize);
3492 while (cpos != NULL)
3494 transmit_to_client (cpos, &im->header, GNUNET_YES);
3502 * Iterator over hash map entries. Checks if the given validation
3503 * entry is for the same challenge as what is given in the PONG.
3505 * @param cls the 'struct TransportPongMessage*'
3506 * @param key peer identity
3507 * @param value value in the hash map ('struct ValidationEntry')
3508 * @return GNUNET_YES if we should continue to
3509 * iterate (mismatch), GNUNET_NO if not (entry matched)
3512 check_pending_validation (void *cls,
3513 const GNUNET_HashCode * key,
3516 const struct TransportPongMessage *pong = cls;
3517 struct ValidationEntry *ve = value;
3518 struct AddValidatedAddressContext avac;
3519 unsigned int challenge = ntohl(pong->challenge);
3520 struct GNUNET_HELLO_Message *hello;
3521 struct GNUNET_PeerIdentity target;
3522 struct NeighbourList *n;
3523 struct ForeignAddressList *fal;
3524 struct OwnAddressList *oal;
3525 struct TransportPlugin *tp;
3526 struct GNUNET_MessageHeader *prem;
3532 ps = ntohs (pong->header.size);
3533 if (ps < sizeof (struct TransportPongMessage))
3535 GNUNET_break_op (0);
3538 addr = (const char*) &pong[1];
3539 slen = strlen (ve->transport_name) + 1;
3540 if ( (ps - sizeof (struct TransportPongMessage) < slen) ||
3541 (ve->challenge != challenge) ||
3542 (addr[slen-1] != '\0') ||
3543 (0 != strcmp (addr, ve->transport_name)) ||
3544 (ntohl (pong->purpose.size)
3545 != sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3547 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3548 sizeof (struct GNUNET_PeerIdentity) + ps - sizeof (struct TransportPongMessage)) )
3553 alen = ps - sizeof (struct TransportPongMessage) - slen;
3554 switch (ntohl (pong->purpose.purpose))
3556 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN:
3557 if ( (ve->addrlen + slen != ntohl (pong->addrlen)) ||
3558 (0 != memcmp (&addr[slen],
3562 return GNUNET_YES; /* different entry, keep trying! */
3564 if (0 != memcmp (&pong->pid,
3566 sizeof (struct GNUNET_PeerIdentity)))
3568 GNUNET_break_op (0);
3572 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
3577 GNUNET_break_op (0);
3582 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3583 "Confirmed validity of address, peer `%4s' has address `%s' (%s).\n",
3585 a2s (ve->transport_name,
3586 (const struct sockaddr *) ve->addr,
3588 ve->transport_name);
3591 case GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING:
3592 if (0 != memcmp (&pong->pid,
3594 sizeof (struct GNUNET_PeerIdentity)))
3596 GNUNET_break_op (0);
3599 if (ve->addrlen != 0)
3601 /* must have been for a different validation entry */
3604 tp = find_transport (ve->transport_name);
3610 oal = tp->addresses;
3613 if ( (oal->addrlen == alen) &&
3614 (0 == memcmp (&oal[1],
3622 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3623 _("Not accepting PONG with address `%s' since I cannot confirm having this address.\n"),
3624 a2s (ve->transport_name,
3630 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING,
3635 GNUNET_break_op (0);
3640 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3641 "Confirmed that peer `%4s' is talking to us using address `%s' (%s) for us.\n",
3643 a2s (ve->transport_name,
3646 ve->transport_name);
3650 GNUNET_break_op (0);
3653 if (GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value == 0)
3655 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3656 _("Received expired signature. Check system time.\n"));
3659 GNUNET_STATISTICS_update (stats,
3660 gettext_noop ("# address validation successes"),
3663 /* create the updated HELLO */
3664 GNUNET_CRYPTO_hash (&ve->publicKey,
3665 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3666 &target.hashPubKey);
3667 if (ve->addr != NULL)
3669 avac.done = GNUNET_NO;
3671 hello = GNUNET_HELLO_create (&ve->publicKey,
3672 &add_validated_address,
3674 GNUNET_PEERINFO_add_peer (peerinfo,
3676 GNUNET_free (hello);
3678 n = find_neighbour (&target);
3681 n->publicKey = ve->publicKey;
3682 n->public_key_valid = GNUNET_YES;
3683 fal = add_peer_address (n,
3688 GNUNET_assert (fal != NULL);
3689 fal->expires = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
3690 fal->validated = GNUNET_YES;
3691 mark_address_connected (fal);
3692 GNUNET_STATISTICS_update (stats,
3693 gettext_noop ("# peer addresses considered valid"),
3696 fal->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
3697 schedule_next_ping (fal);
3698 if (n->latency.rel_value == GNUNET_TIME_UNIT_FOREVER_REL.rel_value)
3699 n->latency = fal->latency;
3701 n->latency.rel_value = (fal->latency.rel_value + n->latency.rel_value) / 2;
3703 n->distance = fal->distance;
3704 if (GNUNET_NO == n->received_pong)
3706 n->received_pong = GNUNET_YES;
3707 notify_clients_connect (&target, n->latency, n->distance);
3708 if (NULL != (prem = n->pre_connect_message_buffer))
3710 n->pre_connect_message_buffer = NULL;
3711 handle_payload_message (prem, n);
3715 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
3717 GNUNET_SCHEDULER_cancel (n->retry_task);
3718 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
3719 try_transmission_to_peer (n);
3723 /* clean up validation entry */
3724 GNUNET_assert (GNUNET_YES ==
3725 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3728 abort_validation (NULL, NULL, ve);
3734 * Function that will be called if we receive a validation
3735 * of an address challenge that we transmitted to another
3736 * peer. Note that the validation should only be considered
3737 * acceptable if the challenge matches AND if the sender
3738 * address is at least a plausible address for this peer
3739 * (otherwise we may be seeing a MiM attack).
3741 * @param cls closure
3742 * @param message the pong message
3743 * @param peer who responded to our challenge
3744 * @param sender_address string describing our sender address (as observed
3745 * by the other peer in binary format)
3746 * @param sender_address_len number of bytes in 'sender_address'
3749 handle_pong (void *cls, const struct GNUNET_MessageHeader *message,
3750 const struct GNUNET_PeerIdentity *peer,
3751 const char *sender_address,
3752 size_t sender_address_len)
3754 #if DEBUG_TRANSPORT > 1
3755 /* we get tons of these that just get discarded, only log
3756 if we are quite verbose */
3757 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3758 "Receiving `%s' message from `%4s'.\n", "PONG",
3761 GNUNET_STATISTICS_update (stats,
3762 gettext_noop ("# PONG messages received"),
3765 if (GNUNET_SYSERR !=
3766 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
3768 &check_pending_validation,
3771 /* This is *expected* to happen a lot since we send
3772 PONGs to *all* known addresses of the sender of
3773 the PING, so most likely we get multiple PONGs
3774 per PING, and all but the first PONG will end up
3775 here. So really we should not print anything here
3776 unless we want to be very, very verbose... */
3777 #if DEBUG_TRANSPORT > 2
3778 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3779 "Received `%s' message from `%4s' but have no record of a matching `%s' message. Ignoring.\n",
3791 * Try to validate a neighbour's address by sending him our HELLO and a PING.
3793 * @param cls the 'struct ValidationEntry*'
3794 * @param neighbour neighbour to validate, NULL if validation failed
3797 transmit_hello_and_ping (void *cls,
3798 struct NeighbourList *neighbour)
3800 struct ValidationEntry *va = cls;
3801 struct ForeignAddressList *peer_address;
3802 struct TransportPingMessage ping;
3803 uint16_t hello_size;
3806 struct GNUNET_PeerIdentity id;
3809 GNUNET_CRYPTO_hash (&va->publicKey,
3810 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3812 if (neighbour == NULL)
3814 /* FIXME: stats... */
3815 GNUNET_break (GNUNET_OK ==
3816 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3819 abort_validation (NULL, NULL, va);
3822 neighbour->publicKey = va->publicKey;
3823 neighbour->public_key_valid = GNUNET_YES;
3824 peer_address = add_peer_address (neighbour,
3825 va->transport_name, NULL,
3826 (const void*) &va[1],
3828 if (peer_address == NULL)
3830 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3831 "Failed to add peer `%4s' for plugin `%s'\n",
3832 GNUNET_i2s (&neighbour->id),
3833 va->transport_name);
3834 GNUNET_break (GNUNET_OK ==
3835 GNUNET_CONTAINER_multihashmap_remove (validation_map,
3838 abort_validation (NULL, NULL, va);
3841 hello_size = GNUNET_HELLO_size(our_hello);
3842 slen = strlen(va->transport_name) + 1;
3843 tsize = sizeof(struct TransportPingMessage) + hello_size + va->addrlen + slen;
3844 message_buf = GNUNET_malloc(tsize);
3845 ping.challenge = htonl(va->challenge);
3846 ping.header.size = htons(sizeof(struct TransportPingMessage) + slen + va->addrlen);
3847 ping.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
3848 memcpy(&ping.target, &neighbour->id, sizeof(struct GNUNET_PeerIdentity));
3849 memcpy(message_buf, our_hello, hello_size);
3850 memcpy(&message_buf[hello_size],
3852 sizeof(struct TransportPingMessage));
3853 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage)],
3856 memcpy(&message_buf[hello_size + sizeof (struct TransportPingMessage) + slen],
3860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3861 "Performing validation of address `%s' via `%s' for peer `%4s' sending `%s' (%u bytes) and `%s' (%u bytes)\n",
3864 : a2s (va->transport_name,
3865 (const void*) &va[1], va->addrlen),
3867 GNUNET_i2s (&neighbour->id),
3868 "HELLO", hello_size,
3869 "PING", sizeof (struct TransportPingMessage) + va->addrlen + slen);
3872 GNUNET_STATISTICS_update (stats,
3873 gettext_noop ("# PING messages sent for initial validation"),
3876 transmit_to_peer (NULL, peer_address,
3877 GNUNET_SCHEDULER_PRIORITY_DEFAULT,
3878 HELLO_VERIFICATION_TIMEOUT,
3880 GNUNET_YES, neighbour);
3881 GNUNET_free(message_buf);
3886 * Check if the given address is already being validated; if not,
3887 * append the given address to the list of entries that are being be
3888 * validated and initiate validation.
3890 * @param cls closure ('struct CheckHelloValidatedContext *')
3891 * @param tname name of the transport
3892 * @param expiration expiration time
3893 * @param addr the address
3894 * @param addrlen length of the address
3895 * @return GNUNET_OK (always)
3898 run_validation (void *cls,
3900 struct GNUNET_TIME_Absolute expiration,
3904 struct CheckHelloValidatedContext *chvc = cls;
3905 struct GNUNET_PeerIdentity id;
3906 struct TransportPlugin *tp;
3907 struct ValidationEntry *va;
3908 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
3909 struct CheckAddressExistsClosure caec;
3910 struct OwnAddressList *oal;
3912 GNUNET_assert (addr != NULL);
3914 GNUNET_STATISTICS_update (stats,
3915 gettext_noop ("# peer addresses scheduled for validation"),
3918 tp = find_transport (tname);
3921 GNUNET_log (GNUNET_ERROR_TYPE_INFO |
3922 GNUNET_ERROR_TYPE_BULK,
3924 ("Transport `%s' not loaded, will not try to validate peer address using this transport.\n"),
3926 GNUNET_STATISTICS_update (stats,
3927 gettext_noop ("# peer addresses not validated (plugin not available)"),
3932 /* check if this is one of our own addresses */
3933 oal = tp->addresses;
3936 if ( (oal->addrlen == addrlen) &&
3937 (0 == memcmp (&oal[1],
3941 /* not plausible, this address is equivalent to our own address! */
3942 GNUNET_STATISTICS_update (stats,
3943 gettext_noop ("# peer addresses not validated (loopback)"),
3950 GNUNET_HELLO_get_key (chvc->hello, &pk);
3951 GNUNET_CRYPTO_hash (&pk,
3953 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
3956 if (is_blacklisted(&id, tp))
3959 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3960 "Attempted to validate blacklisted peer `%s' using `%s'!\n",
3968 caec.addrlen = addrlen;
3969 caec.session = NULL;
3971 caec.exists = GNUNET_NO;
3972 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
3973 &check_address_exists,
3975 if (caec.exists == GNUNET_YES)
3977 /* During validation attempts we will likely trigger the other
3978 peer trying to validate our address which in turn will cause
3979 it to send us its HELLO, so we expect to hit this case rather
3980 frequently. Only print something if we are very verbose. */
3981 #if DEBUG_TRANSPORT > 1
3982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3983 "Validation of address `%s' via `%s' for peer `%4s' already in progress.\n",
3984 a2s (tname, addr, addrlen),
3988 GNUNET_STATISTICS_update (stats,
3989 gettext_noop ("# peer addresses not validated (in progress)"),
3994 va = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
3997 va->transport_name = GNUNET_strdup (tname);
3998 va->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
4000 va->send_time = GNUNET_TIME_absolute_get();
4001 va->addr = (const void*) &va[1];
4002 memcpy (&va[1], addr, addrlen);
4003 va->addrlen = addrlen;
4004 GNUNET_HELLO_get_key (chvc->hello,
4006 va->timeout_task = GNUNET_SCHEDULER_add_delayed (HELLO_VERIFICATION_TIMEOUT,
4007 &timeout_hello_validation,
4009 GNUNET_CONTAINER_multihashmap_put (validation_map,
4012 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
4013 setup_peer_check_blacklist (&id, GNUNET_NO,
4014 &transmit_hello_and_ping,
4021 * Check if addresses in validated hello "h" overlap with
4022 * those in "chvc->hello" and validate the rest.
4024 * @param cls closure
4025 * @param peer id of the peer, NULL for last call
4026 * @param h hello message for the peer (can be NULL)
4029 check_hello_validated (void *cls,
4030 const struct GNUNET_PeerIdentity *peer,
4031 const struct GNUNET_HELLO_Message *h)
4033 struct CheckHelloValidatedContext *chvc = cls;
4034 struct GNUNET_HELLO_Message *plain_hello;
4035 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
4036 struct GNUNET_PeerIdentity target;
4037 struct NeighbourList *n;
4041 GNUNET_STATISTICS_update (stats,
4042 gettext_noop ("# outstanding peerinfo iterate requests"),
4046 if (GNUNET_NO == chvc->hello_known)
4048 /* notify PEERINFO about the peer now, so that we at least
4049 have the public key if some other component needs it */
4050 GNUNET_HELLO_get_key (chvc->hello, &pk);
4051 GNUNET_CRYPTO_hash (&pk,
4052 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4053 &target.hashPubKey);
4054 plain_hello = GNUNET_HELLO_create (&pk,
4057 GNUNET_PEERINFO_add_peer (peerinfo, plain_hello);
4058 GNUNET_free (plain_hello);
4059 #if DEBUG_TRANSPORT_HELLO
4060 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4061 "PEERINFO had no `%s' message for peer `%4s', full validation needed.\n",
4063 GNUNET_i2s (&target));
4065 GNUNET_STATISTICS_update (stats,
4066 gettext_noop ("# new HELLOs requiring full validation"),
4069 GNUNET_HELLO_iterate_addresses (chvc->hello,
4076 GNUNET_STATISTICS_update (stats,
4077 gettext_noop ("# duplicate HELLO (peer known)"),
4082 if (chvc->ve_count == 0)
4084 GNUNET_CONTAINER_DLL_remove (chvc_head,
4093 #if DEBUG_TRANSPORT_HELLO
4094 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4095 "PEERINFO had `%s' message for peer `%4s', validating only new addresses.\n",
4099 chvc->hello_known = GNUNET_YES;
4100 n = find_neighbour (peer);
4103 #if DEBUG_TRANSPORT_HELLO
4104 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4105 "Calling hello_iterate_addresses for %s!\n",
4108 GNUNET_HELLO_iterate_addresses (h,
4110 &add_to_foreign_address_list,
4112 try_transmission_to_peer (n);
4116 #if DEBUG_TRANSPORT_HELLO
4117 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4118 "No existing neighbor record for %s!\n",
4121 GNUNET_STATISTICS_update (stats,
4122 gettext_noop ("# no existing neighbour record (validating HELLO)"),
4126 GNUNET_STATISTICS_update (stats,
4127 gettext_noop ("# HELLO validations (update case)"),
4130 GNUNET_HELLO_iterate_new_addresses (chvc->hello,
4132 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME),
4139 * Process HELLO-message.
4141 * @param plugin transport involved, may be NULL
4142 * @param message the actual message
4143 * @return GNUNET_OK if the HELLO was well-formed, GNUNET_SYSERR otherwise
4146 process_hello (struct TransportPlugin *plugin,
4147 const struct GNUNET_MessageHeader *message)
4150 struct GNUNET_PeerIdentity target;
4151 const struct GNUNET_HELLO_Message *hello;
4152 struct CheckHelloValidatedContext *chvc;
4153 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded publicKey;
4154 #if DEBUG_TRANSPORT_HELLO > 2
4157 hsize = ntohs (message->size);
4158 if ((ntohs (message->type) != GNUNET_MESSAGE_TYPE_HELLO) ||
4159 (hsize < sizeof (struct GNUNET_MessageHeader)))
4162 return GNUNET_SYSERR;
4164 GNUNET_STATISTICS_update (stats,
4165 gettext_noop ("# HELLOs received for validation"),
4169 /* first, check if load is too high */
4170 if (GNUNET_SCHEDULER_get_load (GNUNET_SCHEDULER_PRIORITY_BACKGROUND) > MAX_HELLO_LOAD)
4172 GNUNET_STATISTICS_update (stats,
4173 gettext_noop ("# HELLOs ignored due to high load"),
4176 #if DEBUG_TRANSPORT_HELLO
4177 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4178 "Ignoring `%s' for `%4s', load too high.\n",
4180 GNUNET_i2s (&target));
4184 hello = (const struct GNUNET_HELLO_Message *) message;
4185 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, &publicKey))
4187 #if DEBUG_TRANSPORT_HELLO
4188 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4189 "Unable to get public key from `%s' for `%4s'!\n",
4191 GNUNET_i2s (&target));
4193 GNUNET_break_op (0);
4194 return GNUNET_SYSERR;
4197 GNUNET_CRYPTO_hash (&publicKey,
4198 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
4199 &target.hashPubKey);
4201 #if DEBUG_TRANSPORT_HELLO
4202 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4203 "Received `%s' message for `%4s'\n",
4205 GNUNET_i2s (&target));
4208 if (0 == memcmp (&my_identity,
4210 sizeof (struct GNUNET_PeerIdentity)))
4212 GNUNET_STATISTICS_update (stats,
4213 gettext_noop ("# HELLOs ignored for validation (is my own HELLO)"),
4219 while (NULL != chvc)
4221 if (GNUNET_HELLO_equals (hello,
4223 GNUNET_TIME_absolute_get ()).abs_value > 0)
4225 #if DEBUG_TRANSPORT_HELLO > 2
4226 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4227 "Received duplicate `%s' message for `%4s'; ignored\n",
4229 GNUNET_i2s (&target));
4231 return GNUNET_OK; /* validation already pending */
4233 if (GNUNET_HELLO_size(hello) == GNUNET_HELLO_size (chvc->hello))
4234 GNUNET_break (0 != memcmp (hello, chvc->hello,
4235 GNUNET_HELLO_size(hello)));
4240 struct NeighbourList *temp_neighbor = find_neighbour(&target);
4241 if ((NULL != temp_neighbor))
4243 fprintf(stderr, "Already know peer, ignoring hello\n");
4248 #if DEBUG_TRANSPORT_HELLO > 2
4251 my_id = GNUNET_strdup(GNUNET_i2s(plugin->env.my_identity));
4252 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4253 "%s: Starting validation of `%s' message for `%4s' via '%s' of size %u\n",
4256 GNUNET_i2s (&target),
4258 GNUNET_HELLO_size(hello));
4262 chvc = GNUNET_malloc (sizeof (struct CheckHelloValidatedContext) + hsize);
4264 chvc->hello = (const struct GNUNET_HELLO_Message *) &chvc[1];
4265 memcpy (&chvc[1], hello, hsize);
4266 GNUNET_CONTAINER_DLL_insert (chvc_head,
4269 /* finally, check if HELLO was previously validated
4270 (continuation will then schedule actual validation) */
4271 GNUNET_STATISTICS_update (stats,
4272 gettext_noop ("# peerinfo process hello iterate requests"),
4275 GNUNET_STATISTICS_update (stats,
4276 gettext_noop ("# outstanding peerinfo iterate requests"),
4279 chvc->piter = GNUNET_PEERINFO_iterate (peerinfo,
4281 HELLO_VERIFICATION_TIMEOUT,
4282 &check_hello_validated, chvc);
4288 * The peer specified by the given neighbour has timed-out or a plugin
4289 * has disconnected. We may either need to do nothing (other plugins
4290 * still up), or trigger a full disconnect and clean up. This
4291 * function updates our state and does the necessary notifications.
4292 * Also notifies our clients that the neighbour is now officially
4295 * @param n the neighbour list entry for the peer
4296 * @param check GNUNET_YES to check if ALL addresses for this peer
4297 * are gone, GNUNET_NO to force a disconnect of the peer
4298 * regardless of whether other addresses exist.
4301 disconnect_neighbour (struct NeighbourList *n, int check)
4303 struct ReadyList *rpos;
4304 struct NeighbourList *npos;
4305 struct NeighbourList *nprev;
4306 struct MessageQueue *mq;
4307 struct ForeignAddressList *peer_addresses;
4308 struct ForeignAddressList *peer_pos;
4310 if (GNUNET_YES == check)
4313 while (NULL != rpos)
4315 peer_addresses = rpos->addresses;
4316 while (peer_addresses != NULL)
4318 if (GNUNET_YES == peer_addresses->connected)
4320 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4321 "NOT Disconnecting from `%4s', still have live addresses!\n",
4322 GNUNET_i2s (&n->id));
4323 return; /* still connected */
4325 peer_addresses = peer_addresses->next;
4331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4332 "Disconnecting from `%4s'\n",
4333 GNUNET_i2s (&n->id));
4335 /* remove n from neighbours list */
4338 while ((npos != NULL) && (npos != n))
4343 GNUNET_assert (npos != NULL);
4345 neighbours = n->next;
4347 nprev->next = n->next;
4349 /* notify all clients about disconnect */
4350 if (GNUNET_YES == n->received_pong)
4351 notify_clients_disconnect (&n->id);
4353 /* clean up all plugins, cancel connections and pending transmissions */
4354 while (NULL != (rpos = n->plugins))
4356 n->plugins = rpos->next;
4357 rpos->plugin->api->disconnect (rpos->plugin->api->cls, &n->id);
4358 while (rpos->addresses != NULL)
4360 peer_pos = rpos->addresses;
4361 rpos->addresses = peer_pos->next;
4362 if (peer_pos->connected == GNUNET_YES)
4363 GNUNET_STATISTICS_update (stats,
4364 gettext_noop ("# connected addresses"),
4367 if (GNUNET_YES == peer_pos->validated)
4368 GNUNET_STATISTICS_update (stats,
4369 gettext_noop ("# peer addresses considered valid"),
4372 if (GNUNET_SCHEDULER_NO_TASK != peer_pos->revalidate_task)
4374 GNUNET_SCHEDULER_cancel (peer_pos->revalidate_task);
4375 peer_pos->revalidate_task = GNUNET_SCHEDULER_NO_TASK;
4377 GNUNET_free(peer_pos);
4382 /* free all messages on the queue */
4383 while (NULL != (mq = n->messages_head))
4385 GNUNET_STATISTICS_update (stats,
4386 gettext_noop ("# bytes in message queue for other peers"),
4387 - (int64_t) mq->message_buf_size,
4389 GNUNET_STATISTICS_update (stats,
4390 gettext_noop ("# bytes discarded due to disconnect"),
4391 mq->message_buf_size,
4393 GNUNET_CONTAINER_DLL_remove (n->messages_head,
4396 GNUNET_assert (0 == memcmp(&mq->neighbour_id,
4398 sizeof(struct GNUNET_PeerIdentity)));
4401 if (n->timeout_task != GNUNET_SCHEDULER_NO_TASK)
4403 GNUNET_SCHEDULER_cancel (n->timeout_task);
4404 n->timeout_task = GNUNET_SCHEDULER_NO_TASK;
4406 if (n->retry_task != GNUNET_SCHEDULER_NO_TASK)
4408 GNUNET_SCHEDULER_cancel (n->retry_task);
4409 n->retry_task = GNUNET_SCHEDULER_NO_TASK;
4411 if (n->piter != NULL)
4413 GNUNET_PEERINFO_iterate_cancel (n->piter);
4414 GNUNET_STATISTICS_update (stats,
4415 gettext_noop ("# outstanding peerinfo iterate requests"),
4420 /* finally, free n itself */
4421 GNUNET_STATISTICS_update (stats,
4422 gettext_noop ("# active neighbours"),
4425 GNUNET_free_non_null (n->pre_connect_message_buffer);
4431 * We have received a PING message from someone. Need to send a PONG message
4432 * in response to the peer by any means necessary.
4435 handle_ping(void *cls, const struct GNUNET_MessageHeader *message,
4436 const struct GNUNET_PeerIdentity *peer,
4437 struct Session *session,
4438 const char *sender_address,
4439 uint16_t sender_address_len)
4441 struct TransportPlugin *plugin = cls;
4442 struct SessionHeader *session_header = (struct SessionHeader*) session;
4443 struct TransportPingMessage *ping;
4444 struct TransportPongMessage *pong;
4445 struct NeighbourList *n;
4446 struct ReadyList *rl;
4447 struct ForeignAddressList *fal;
4448 struct OwnAddressList *oal;
4453 if (ntohs (message->size) < sizeof (struct TransportPingMessage))
4455 GNUNET_break_op (0);
4456 return GNUNET_SYSERR;
4459 ping = (struct TransportPingMessage *) message;
4460 if (0 != memcmp (&ping->target,
4461 plugin->env.my_identity,
4462 sizeof (struct GNUNET_PeerIdentity)))
4464 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4465 _("Received `%s' message from `%s' destined for `%s' which is not me!\n"),
4467 (sender_address != NULL)
4468 ? a2s (plugin->short_name,
4469 (const struct sockaddr *)sender_address,
4472 GNUNET_i2s (&ping->target));
4473 return GNUNET_SYSERR;
4476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
4477 "Processing `%s' from `%s'\n",
4479 (sender_address != NULL)
4480 ? a2s (plugin->short_name,
4481 (const struct sockaddr *)sender_address,
4485 GNUNET_STATISTICS_update (stats,
4486 gettext_noop ("# PING messages received"),
4489 addr = (const char*) &ping[1];
4490 alen = ntohs (message->size) - sizeof (struct TransportPingMessage);
4491 slen = strlen (plugin->short_name) + 1;
4494 /* peer wants to confirm that we have an outbound connection to him */
4495 if (session == NULL)
4497 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4498 _("Refusing to create PONG since I do not have a session with `%s'.\n"),
4500 return GNUNET_SYSERR;
4502 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4503 pong->header.size = htons (sizeof (struct TransportPongMessage) + sender_address_len + slen);
4504 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4505 pong->purpose.size =
4506 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4508 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4509 sizeof (struct GNUNET_PeerIdentity) + sender_address_len + slen);
4510 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_USING);
4511 pong->challenge = ping->challenge;
4512 pong->addrlen = htonl(sender_address_len + slen);
4515 sizeof(struct GNUNET_PeerIdentity));
4519 if ((sender_address!=NULL) && (sender_address_len > 0))
4520 memcpy (&((char*)&pong[1])[slen],
4522 sender_address_len);
4523 if (GNUNET_TIME_absolute_get_remaining (session_header->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4)
4525 /* create / update cached sig */
4527 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4528 "Creating PONG signature to indicate active connection.\n");
4530 session_header->pong_sig_expires = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
4531 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4532 GNUNET_assert (GNUNET_OK ==
4533 GNUNET_CRYPTO_rsa_sign (my_private_key,
4535 &session_header->pong_signature));
4539 pong->expiration = GNUNET_TIME_absolute_hton (session_header->pong_sig_expires);
4541 memcpy (&pong->signature,
4542 &session_header->pong_signature,
4543 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4549 /* peer wants to confirm that this is one of our addresses */
4553 plugin->api->check_address (plugin->api->cls,
4557 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4558 _("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
4559 a2s (plugin->short_name,
4564 oal = plugin->addresses;
4567 if ( (oal->addrlen == alen) &&
4574 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
4575 pong->header.size = htons (sizeof (struct TransportPongMessage) + alen + slen);
4576 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
4577 pong->purpose.size =
4578 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
4580 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
4581 sizeof (struct GNUNET_PeerIdentity) + alen + slen);
4582 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
4583 pong->challenge = ping->challenge;
4584 pong->addrlen = htonl(alen + slen);
4587 sizeof(struct GNUNET_PeerIdentity));
4588 memcpy (&pong[1], plugin->short_name, slen);
4589 memcpy (&((char*)&pong[1])[slen], addr, alen);
4590 if ( (oal != NULL) &&
4591 (GNUNET_TIME_absolute_get_remaining (oal->pong_sig_expires).rel_value < PONG_SIGNATURE_LIFETIME.rel_value / 4) )
4593 /* create / update cached sig */
4595 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4596 "Creating PONG signature to indicate ownership.\n");
4598 oal->pong_sig_expires = GNUNET_TIME_absolute_min (oal->expires,
4599 GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4600 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4601 GNUNET_assert (GNUNET_OK ==
4602 GNUNET_CRYPTO_rsa_sign (my_private_key,
4604 &oal->pong_signature));
4605 memcpy (&pong->signature,
4606 &oal->pong_signature,
4607 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4609 else if (oal == NULL)
4611 /* not using cache (typically DV-only) */
4612 pong->expiration = GNUNET_TIME_absolute_hton (GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME));
4613 GNUNET_assert (GNUNET_OK ==
4614 GNUNET_CRYPTO_rsa_sign (my_private_key,
4620 /* can used cached version */
4621 pong->expiration = GNUNET_TIME_absolute_hton (oal->pong_sig_expires);
4622 memcpy (&pong->signature,
4623 &oal->pong_signature,
4624 sizeof (struct GNUNET_CRYPTO_RsaSignature));
4627 n = find_neighbour(peer);
4628 GNUNET_assert (n != NULL);
4629 /* first try reliable response transmission */
4633 fal = rl->addresses;
4636 if (-1 != rl->plugin->api->send (rl->plugin->api->cls,
4639 ntohs (pong->header.size),
4640 TRANSPORT_PONG_PRIORITY,
4641 HELLO_VERIFICATION_TIMEOUT,
4649 GNUNET_STATISTICS_update (stats,
4650 gettext_noop ("# PONGs unicast via reliable transport"),
4660 /* no reliable method found, do multicast */
4661 GNUNET_STATISTICS_update (stats,
4662 gettext_noop ("# PONGs multicast to all available addresses"),
4668 fal = rl->addresses;
4671 transmit_to_peer(NULL, fal,
4672 TRANSPORT_PONG_PRIORITY,
4673 HELLO_VERIFICATION_TIMEOUT,
4675 ntohs(pong->header.size),
4688 * Function called by the plugin for each received message.
4689 * Update data volumes, possibly notify plugins about
4690 * reducing the rate at which they read from the socket
4691 * and generally forward to our receive callback.
4693 * @param cls the "struct TransportPlugin *" we gave to the plugin
4694 * @param peer (claimed) identity of the other peer
4695 * @param message the message, NULL if we only care about
4696 * learning about the delay until we should receive again
4697 * @param ats information for automatic transport selection
4698 * @param ats_count number of elements in ats not including 0-terminator
4699 * @param session identifier used for this session (can be NULL)
4700 * @param sender_address binary address of the sender (if observed)
4701 * @param sender_address_len number of bytes in sender_address
4702 * @return how long in ms the plugin should wait until receiving more data
4703 * (plugins that do not support this, can ignore the return value)
4705 static struct GNUNET_TIME_Relative
4706 plugin_env_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4707 const struct GNUNET_MessageHeader *message,
4708 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4710 struct Session *session,
4711 const char *sender_address,
4712 uint16_t sender_address_len)
4714 struct TransportPlugin *plugin = cls;
4715 struct ReadyList *service_context;
4716 struct ForeignAddressList *peer_address;
4718 struct NeighbourList *n;
4719 struct GNUNET_TIME_Relative ret;
4720 if (is_blacklisted (peer, plugin))
4721 return GNUNET_TIME_UNIT_FOREVER_REL;
4725 n = find_neighbour (peer);
4727 n = setup_new_neighbour (peer, GNUNET_YES);
4728 service_context = n->plugins;
4729 while ((service_context != NULL) && (plugin != service_context->plugin))
4730 service_context = service_context->next;
4731 GNUNET_assert ((plugin->api->send == NULL) || (service_context != NULL));
4732 peer_address = NULL;
4734 for (c=0; c<ats_count; c++)
4736 if (ntohl(ats[c].type) == GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE)
4738 distance = ntohl(ats[c].value);
4742 if (message != NULL)
4744 if ( (session != NULL) ||
4745 (sender_address != NULL) )
4746 peer_address = add_peer_address (n,
4750 sender_address_len);
4751 if (peer_address != NULL)
4753 peer_address->distance = distance;
4754 if (GNUNET_YES == peer_address->validated)
4755 mark_address_connected (peer_address);
4756 peer_address->timeout
4758 GNUNET_TIME_relative_to_absolute
4759 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4760 schedule_next_ping (peer_address);
4762 /* update traffic received amount ... */
4763 msize = ntohs (message->size);
4764 GNUNET_STATISTICS_update (stats,
4765 gettext_noop ("# bytes received from other peers"),
4768 n->distance = distance;
4770 GNUNET_TIME_relative_to_absolute
4771 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
4772 GNUNET_SCHEDULER_cancel (n->timeout_task);
4774 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4775 &neighbour_timeout_task, n);
4776 if (n->quota_violation_count > QUOTA_VIOLATION_DROP_THRESHOLD)
4778 /* dropping message due to frequent inbound volume violations! */
4779 GNUNET_log (GNUNET_ERROR_TYPE_WARNING |
4780 GNUNET_ERROR_TYPE_BULK,
4782 ("Dropping incoming message due to repeated bandwidth quota (%u b/s) violations (total of %u).\n"),
4783 n->in_tracker.available_bytes_per_s__,
4784 n->quota_violation_count);
4785 GNUNET_STATISTICS_update (stats,
4786 gettext_noop ("# bandwidth quota violations by other peers"),
4789 return GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT;
4793 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4794 "Received message of type %u and size %u from `%4s', sending to all clients.\n",
4795 ntohs (message->type),
4796 ntohs (message->size),
4799 switch (ntohs (message->type))
4801 case GNUNET_MESSAGE_TYPE_HELLO:
4802 GNUNET_STATISTICS_update (stats,
4803 gettext_noop ("# HELLO messages received from other peers"),
4806 process_hello (plugin, message);
4808 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
4809 handle_ping (plugin, message, peer, session, sender_address, sender_address_len);
4811 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
4812 handle_pong (plugin, message, peer, sender_address, sender_address_len);
4815 handle_payload_message (message, n);
4819 ret = GNUNET_BANDWIDTH_tracker_get_delay (&n->in_tracker, 0);
4820 if (ret.rel_value > 0)
4822 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4823 "Throttling read (%llu bytes excess at %u b/s), waiting %llums before reading more.\n",
4824 (unsigned long long) n->in_tracker.consumption_since_last_update__,
4825 (unsigned int) n->in_tracker.available_bytes_per_s__,
4826 (unsigned long long) ret.rel_value);
4827 GNUNET_STATISTICS_update (stats,
4828 gettext_noop ("# ms throttling suggested"),
4829 (int64_t) ret.rel_value,
4836 * Handle START-message. This is the first message sent to us
4837 * by any client which causes us to add it to our list.
4839 * @param cls closure (always NULL)
4840 * @param client identification of the client
4841 * @param message the actual message
4844 handle_start (void *cls,
4845 struct GNUNET_SERVER_Client *client,
4846 const struct GNUNET_MessageHeader *message)
4848 const struct StartMessage *start;
4849 struct TransportClient *c;
4850 struct ConnectInfoMessage * cim;
4851 struct NeighbourList *n;
4855 start = (const struct StartMessage*) message;
4857 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4858 "Received `%s' request from client\n", "START");
4863 if (c->client == client)
4865 /* client already on our list! */
4867 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4872 if ( (GNUNET_NO != ntohl (start->do_check)) &&
4873 (0 != memcmp (&start->self,
4875 sizeof (struct GNUNET_PeerIdentity))) )
4877 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4878 _("Rejecting control connection from peer `%s', which is not me!\n"),
4879 GNUNET_i2s (&start->self));
4880 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4883 c = GNUNET_malloc (sizeof (struct TransportClient));
4887 if (our_hello != NULL)
4890 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4891 "Sending our own `%s' to new client\n", "HELLO");
4893 transmit_to_client (c,
4894 (const struct GNUNET_MessageHeader *) our_hello,
4896 /* tell new client about all existing connections */
4898 size = sizeof (struct ConnectInfoMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
4899 if (size > GNUNET_SERVER_MAX_MESSAGE_SIZE)
4903 cim = GNUNET_malloc (size);
4904 cim->header.size = htons (size);
4905 cim->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
4906 cim->ats_count = htonl(ats_count);
4907 (&(cim->ats))[2].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
4908 (&(cim->ats))[2].value = htonl (0);
4912 if (GNUNET_YES == n->received_pong)
4914 (&(cim->ats))[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
4915 (&(cim->ats))[0].value = htonl (n->distance);
4916 (&(cim->ats))[1].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY);
4917 (&(cim->ats))[1].value = htonl ((uint32_t) n->latency.rel_value);
4919 transmit_to_client (c, &cim->header, GNUNET_NO);
4925 GNUNET_SERVER_receive_done (client, GNUNET_OK);
4930 * Handle HELLO-message.
4932 * @param cls closure (always NULL)
4933 * @param client identification of the client
4934 * @param message the actual message
4937 handle_hello (void *cls,
4938 struct GNUNET_SERVER_Client *client,
4939 const struct GNUNET_MessageHeader *message)
4943 GNUNET_STATISTICS_update (stats,
4944 gettext_noop ("# HELLOs received from clients"),
4947 ret = process_hello (NULL, message);
4948 GNUNET_SERVER_receive_done (client, ret);
4953 * Closure for 'transmit_client_message'; followed by
4954 * 'msize' bytes of the actual message.
4956 struct TransmitClientMessageContext
4959 * Client on whom's behalf we are sending.
4961 struct GNUNET_SERVER_Client *client;
4964 * Timeout for the transmission.
4966 struct GNUNET_TIME_Absolute timeout;
4974 * Size of the message in bytes.
4981 * Schedule transmission of a message we got from a client to a peer.
4983 * @param cls the 'struct TransmitClientMessageContext*'
4984 * @param n destination, or NULL on error (in that case, drop the message)
4987 transmit_client_message (void *cls,
4988 struct NeighbourList *n)
4990 struct TransmitClientMessageContext *tcmc = cls;
4991 struct TransportClient *tc;
4994 while ((tc != NULL) && (tc->client != tcmc->client))
4999 transmit_to_peer (tc, NULL, tcmc->priority,
5000 GNUNET_TIME_absolute_get_remaining (tcmc->timeout),
5002 tcmc->msize, GNUNET_NO, n);
5004 GNUNET_SERVER_receive_done (tcmc->client, GNUNET_OK);
5005 GNUNET_SERVER_client_drop (tcmc->client);
5011 * Handle SEND-message.
5013 * @param cls closure (always NULL)
5014 * @param client identification of the client
5015 * @param message the actual message
5018 handle_send (void *cls,
5019 struct GNUNET_SERVER_Client *client,
5020 const struct GNUNET_MessageHeader *message)
5022 const struct OutboundMessage *obm;
5023 const struct GNUNET_MessageHeader *obmm;
5024 struct TransmitClientMessageContext *tcmc;
5028 size = ntohs (message->size);
5030 sizeof (struct OutboundMessage) + sizeof (struct GNUNET_MessageHeader))
5033 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5036 GNUNET_STATISTICS_update (stats,
5037 gettext_noop ("# payload received for other peers"),
5040 obm = (const struct OutboundMessage *) message;
5041 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
5042 msize = size - sizeof (struct OutboundMessage);
5044 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5045 "Received `%s' request from client with target `%4s' and message of type %u and size %u\n",
5046 "SEND", GNUNET_i2s (&obm->peer),
5050 tcmc = GNUNET_malloc (sizeof (struct TransmitClientMessageContext) + msize);
5051 tcmc->client = client;
5052 tcmc->priority = ntohl (obm->priority);
5053 tcmc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_ntoh (obm->timeout));
5054 tcmc->msize = msize;
5055 /* FIXME: this memcpy can be up to 7% of our total runtime */
5056 memcpy (&tcmc[1], obmm, msize);
5057 GNUNET_SERVER_client_keep (client);
5058 setup_peer_check_blacklist (&obm->peer, GNUNET_YES,
5059 &transmit_client_message,
5065 * Handle request connect message
5067 * @param cls closure (always NULL)
5068 * @param client identification of the client
5069 * @param message the actual message
5072 handle_request_connect (void *cls,
5073 struct GNUNET_SERVER_Client *client,
5074 const struct GNUNET_MessageHeader *message)
5076 const struct TransportRequestConnectMessage *trcm =
5077 (const struct TransportRequestConnectMessage *) message;
5079 GNUNET_STATISTICS_update (stats,
5080 gettext_noop ("# REQUEST CONNECT messages received"),
5083 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Received a request connect message for peer %s\n", GNUNET_i2s(&trcm->peer));
5084 setup_peer_check_blacklist (&trcm->peer, GNUNET_YES,
5086 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5090 * Handle SET_QUOTA-message.
5092 * @param cls closure (always NULL)
5093 * @param client identification of the client
5094 * @param message the actual message
5097 handle_set_quota (void *cls,
5098 struct GNUNET_SERVER_Client *client,
5099 const struct GNUNET_MessageHeader *message)
5101 const struct QuotaSetMessage *qsm =
5102 (const struct QuotaSetMessage *) message;
5103 struct NeighbourList *n;
5105 GNUNET_STATISTICS_update (stats,
5106 gettext_noop ("# SET QUOTA messages received"),
5109 n = find_neighbour (&qsm->peer);
5112 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5113 GNUNET_STATISTICS_update (stats,
5114 gettext_noop ("# SET QUOTA messages ignored (no such peer)"),
5120 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5121 "Received `%s' request (new quota %u, old quota %u) from client for peer `%4s'\n",
5123 (unsigned int) ntohl (qsm->quota.value__),
5124 (unsigned int) n->in_tracker.available_bytes_per_s__,
5125 GNUNET_i2s (&qsm->peer));
5127 GNUNET_BANDWIDTH_tracker_update_quota (&n->in_tracker,
5129 if (0 == ntohl (qsm->quota.value__))
5131 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5132 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&n->id),
5134 disconnect_neighbour (n, GNUNET_NO);
5136 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5141 * Take the given address and append it to the set of results sent back to
5144 * @param cls the transmission context used ('struct GNUNET_SERVER_TransmitContext*')
5145 * @param address the resolved name, NULL to indicate the last response
5148 transmit_address_to_client (void *cls, const char *address)
5150 struct GNUNET_SERVER_TransmitContext *tc = cls;
5153 if (NULL == address)
5156 slen = strlen (address) + 1;
5158 GNUNET_SERVER_transmit_context_append_data (tc, address, slen,
5159 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5160 if (NULL == address)
5161 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
5166 * Handle AddressLookup-message.
5168 * @param cls closure (always NULL)
5169 * @param client identification of the client
5170 * @param message the actual message
5173 handle_address_lookup (void *cls,
5174 struct GNUNET_SERVER_Client *client,
5175 const struct GNUNET_MessageHeader *message)
5177 const struct AddressLookupMessage *alum;
5178 struct TransportPlugin *lsPlugin;
5179 const char *nameTransport;
5180 const char *address;
5182 struct GNUNET_SERVER_TransmitContext *tc;
5183 struct GNUNET_TIME_Absolute timeout;
5184 struct GNUNET_TIME_Relative rtimeout;
5187 size = ntohs (message->size);
5188 if (size < sizeof (struct AddressLookupMessage))
5190 GNUNET_break_op (0);
5191 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5194 alum = (const struct AddressLookupMessage *) message;
5195 uint32_t addressLen = ntohl (alum->addrlen);
5196 if (size <= sizeof (struct AddressLookupMessage) + addressLen)
5198 GNUNET_break_op (0);
5199 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5202 address = (const char *) &alum[1];
5203 nameTransport = (const char *) &address[addressLen];
5205 [size - sizeof (struct AddressLookupMessage) - addressLen - 1] != '\0')
5207 GNUNET_break_op (0);
5208 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5211 timeout = GNUNET_TIME_absolute_ntoh (alum->timeout);
5212 rtimeout = GNUNET_TIME_absolute_get_remaining (timeout);
5213 numeric = ntohl (alum->numeric_only);
5214 lsPlugin = find_transport (nameTransport);
5215 if (NULL == lsPlugin)
5217 tc = GNUNET_SERVER_transmit_context_create (client);
5218 GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
5219 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
5220 GNUNET_SERVER_transmit_context_run (tc, rtimeout);
5223 tc = GNUNET_SERVER_transmit_context_create (client);
5224 lsPlugin->api->address_pretty_printer (lsPlugin->api->cls,
5226 address, addressLen,
5229 &transmit_address_to_client, tc);
5234 * Setup the environment for this plugin.
5237 create_environment (struct TransportPlugin *plug)
5239 plug->env.cfg = cfg;
5240 plug->env.my_identity = &my_identity;
5241 plug->env.our_hello = &our_hello;
5242 plug->env.cls = plug;
5243 plug->env.receive = &plugin_env_receive;
5244 plug->env.notify_address = &plugin_env_notify_address;
5245 plug->env.session_end = &plugin_env_session_end;
5246 plug->env.max_connections = max_connect_per_transport;
5247 plug->env.stats = stats;
5252 * Start the specified transport (load the plugin).
5255 start_transport (struct GNUNET_SERVER_Handle *server,
5258 struct TransportPlugin *plug;
5261 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5262 _("Loading `%s' transport plugin\n"), name);
5263 GNUNET_asprintf (&libname, "libgnunet_plugin_transport_%s", name);
5264 plug = GNUNET_malloc (sizeof (struct TransportPlugin));
5265 create_environment (plug);
5266 plug->short_name = GNUNET_strdup (name);
5267 plug->lib_name = libname;
5268 plug->next = plugins;
5270 plug->api = GNUNET_PLUGIN_load (libname, &plug->env);
5271 if (plug->api == NULL)
5273 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5274 _("Failed to load transport plugin for `%s'\n"), name);
5275 GNUNET_free (plug->short_name);
5276 plugins = plug->next;
5277 GNUNET_free (libname);
5284 * Called whenever a client is disconnected. Frees our
5285 * resources associated with that client.
5287 * @param cls closure
5288 * @param client identification of the client
5291 client_disconnect_notification (void *cls,
5292 struct GNUNET_SERVER_Client *client)
5294 struct TransportClient *pos;
5295 struct TransportClient *prev;
5296 struct ClientMessageQueueEntry *mqe;
5297 struct Blacklisters *bl;
5298 struct BlacklistCheck *bc;
5303 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
5304 "Client disconnected, cleaning up.\n");
5306 /* clean up blacklister */
5310 if (bl->client == client)
5315 if (bc->bl_pos == bl)
5317 bc->bl_pos = bl->next;
5320 GNUNET_CONNECTION_notify_transmit_ready_cancel (bc->th);
5323 if (bc->task == GNUNET_SCHEDULER_NO_TASK)
5324 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check,
5330 GNUNET_CONTAINER_DLL_remove (bl_head,
5333 GNUNET_SERVER_client_drop (bl->client);
5339 /* clean up 'normal' clients */
5342 while ((pos != NULL) && (pos->client != client))
5349 while (NULL != (mqe = pos->message_queue_head))
5351 GNUNET_CONTAINER_DLL_remove (pos->message_queue_head,
5352 pos->message_queue_tail,
5354 pos->message_count--;
5358 clients = pos->next;
5360 prev->next = pos->next;
5361 if (GNUNET_YES == pos->tcs_pending)
5366 if (pos->th != NULL)
5368 GNUNET_CONNECTION_notify_transmit_ready_cancel (pos->th);
5371 GNUNET_break (0 == pos->message_count);
5377 * Function called when the service shuts down. Unloads our plugins
5378 * and cancels pending validations.
5380 * @param cls closure, unused
5381 * @param tc task context (unused)
5384 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5386 struct TransportPlugin *plug;
5387 struct OwnAddressList *al;
5388 struct CheckHelloValidatedContext *chvc;
5390 while (neighbours != NULL)
5392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5393 "Disconnecting peer `%4s', %s\n", GNUNET_i2s(&neighbours->id),
5395 disconnect_neighbour (neighbours, GNUNET_NO);
5398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5399 "Transport service is unloading plugins...\n");
5401 while (NULL != (plug = plugins))
5403 plugins = plug->next;
5404 if (plug->address_update_task != GNUNET_SCHEDULER_NO_TASK)
5406 GNUNET_SCHEDULER_cancel (plug->address_update_task);
5407 plug->address_update_task = GNUNET_SCHEDULER_NO_TASK;
5409 GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
5410 GNUNET_free (plug->lib_name);
5411 GNUNET_free (plug->short_name);
5412 while (NULL != (al = plug->addresses))
5414 plug->addresses = al->next;
5419 if (my_private_key != NULL)
5420 GNUNET_CRYPTO_rsa_key_free (my_private_key);
5421 GNUNET_free_non_null (our_hello);
5423 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
5426 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5427 validation_map = NULL;
5429 /* free 'chvc' data structure */
5430 while (NULL != (chvc = chvc_head))
5432 chvc_head = chvc->next;
5433 if (chvc->piter != NULL)
5435 GNUNET_PEERINFO_iterate_cancel (chvc->piter);
5436 GNUNET_STATISTICS_update (stats,
5437 gettext_noop ("# outstanding peerinfo iterate requests"),
5443 GNUNET_assert (chvc->ve_count == 0);
5450 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5453 if (peerinfo != NULL)
5455 GNUNET_PEERINFO_disconnect (peerinfo);
5458 /* Can we assume those are gone by now, or do we need to clean up
5460 GNUNET_break (bl_head == NULL);
5461 GNUNET_break (bc_head == NULL);
5466 * Initiate transport service.
5468 * @param cls closure
5469 * @param server the initialized server
5470 * @param c configuration to use
5474 struct GNUNET_SERVER_Handle *server,
5475 const struct GNUNET_CONFIGURATION_Handle *c)
5477 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
5478 {&handle_start, NULL,
5479 GNUNET_MESSAGE_TYPE_TRANSPORT_START, sizeof (struct StartMessage)},
5480 {&handle_hello, NULL,
5481 GNUNET_MESSAGE_TYPE_HELLO, 0},
5482 {&handle_send, NULL,
5483 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, 0},
5484 {&handle_request_connect, NULL,
5485 GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT, sizeof(struct TransportRequestConnectMessage)},
5486 {&handle_set_quota, NULL,
5487 GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA, sizeof (struct QuotaSetMessage)},
5488 {&handle_address_lookup, NULL,
5489 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_LOOKUP,
5491 {&handle_blacklist_init, NULL,
5492 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT, sizeof (struct GNUNET_MessageHeader)},
5493 {&handle_blacklist_reply, NULL,
5494 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY, sizeof (struct BlacklistMessage)},
5500 unsigned long long tneigh;
5504 stats = GNUNET_STATISTICS_create ("transport", cfg);
5505 validation_map = GNUNET_CONTAINER_multihashmap_create (64);
5506 /* parse configuration */
5508 GNUNET_CONFIGURATION_get_value_number (c,
5513 GNUNET_CONFIGURATION_get_value_filename (c,
5515 "HOSTKEY", &keyfile)))
5517 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5519 ("Transport service is lacking key configuration settings. Exiting.\n"));
5520 GNUNET_SCHEDULER_shutdown ();
5523 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5526 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5527 validation_map = NULL;
5530 max_connect_per_transport = (uint32_t) tneigh;
5531 peerinfo = GNUNET_PEERINFO_connect (cfg);
5532 if (peerinfo == NULL)
5534 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5535 _("Could not access PEERINFO service. Exiting.\n"));
5536 GNUNET_SCHEDULER_shutdown ();
5539 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5542 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5543 validation_map = NULL;
5544 GNUNET_free (keyfile);
5547 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
5548 GNUNET_free (keyfile);
5549 if (my_private_key == NULL)
5551 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5553 ("Transport service could not access hostkey. Exiting.\n"));
5554 GNUNET_SCHEDULER_shutdown ();
5557 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
5560 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
5561 validation_map = NULL;
5564 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
5565 GNUNET_CRYPTO_hash (&my_public_key,
5566 sizeof (my_public_key), &my_identity.hashPubKey);
5567 /* setup notification */
5568 GNUNET_SERVER_disconnect_notify (server,
5569 &client_disconnect_notification, NULL);
5570 /* load plugins... */
5573 GNUNET_CONFIGURATION_get_value_string (c,
5574 "TRANSPORT", "PLUGINS", &plugs))
5576 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5577 _("Starting transport plugins `%s'\n"), plugs);
5578 pos = strtok (plugs, " ");
5581 start_transport (server, pos);
5583 pos = strtok (NULL, " ");
5585 GNUNET_free (plugs);
5587 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
5588 &shutdown_task, NULL);
5593 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Transport service ready.\n"));
5595 /* If we have a blacklist file, read from it */
5596 read_blacklist_file(cfg);
5597 /* process client requests */
5598 GNUNET_SERVER_add_handlers (server, handlers);
5603 * The main function for the transport service.
5605 * @param argc number of arguments from the command line
5606 * @param argv command line arguments
5607 * @return 0 ok, 1 on error
5610 main (int argc, char *const *argv)
5612 a2s (NULL, NULL, 0); /* make compiler happy */
5613 return (GNUNET_OK ==
5614 GNUNET_SERVICE_run (argc,
5617 GNUNET_SERVICE_OPTION_NONE,
5618 &run, NULL)) ? 0 : 1;
5621 /* end of gnunet-service-transport.c */