2 This file is part of GNUnet.
3 (C) 2010-2014 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_validation.c
23 * @brief address validation subsystem
24 * @author Christian Grothoff
27 #include "gnunet-service-transport_clients.h"
28 #include "gnunet-service-transport_validation.h"
29 #include "gnunet-service-transport_plugins.h"
30 #include "gnunet-service-transport_hello.h"
31 #include "gnunet-service-transport_blacklist.h"
32 #include "gnunet-service-transport_neighbours.h"
33 #include "gnunet-service-transport.h"
34 #include "gnunet_hello_lib.h"
35 #include "gnunet_ats_service.h"
36 #include "gnunet_peerinfo_service.h"
37 #include "gnunet_signatures.h"
41 * How long is a PONG signature valid? We'll recycle a signature until
42 * 1/4 of this time is remaining. PONGs should expire so that if our
43 * external addresses change an adversary cannot replay them indefinitely.
44 * OTOH, we don't want to spend too much time generating PONG signatures,
45 * so they must have some lifetime to reduce our CPU usage.
47 #define PONG_SIGNATURE_LIFETIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
50 * After how long do we expire an address in a HELLO that we just
51 * validated? This value is also used for our own addresses when we
54 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
57 * How often do we allow PINGing an address that we have not yet
58 * validated? This also determines how long we track an address that
59 * we cannot validate (because after this time we can destroy the
62 #define UNVALIDATED_PING_KEEPALIVE GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
65 * How often do we PING an address that we have successfully validated
66 * in the past but are not actively using? Should be (significantly)
67 * smaller than HELLO_ADDRESS_EXPIRATION.
69 #define VALIDATED_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
72 * How often do we PING an address that we are currently using?
74 #define CONNECTED_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
77 * How much delay is acceptable for sending the PING or PONG?
79 #define ACCEPTABLE_PING_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
82 * Size of the validation map hashmap.
84 #define VALIDATION_MAP_SIZE 256
87 * Priority to use for PINGs
89 #define PING_PRIORITY 2
92 * Priority to use for PONGs
94 #define PONG_PRIORITY 4
97 GNUNET_NETWORK_STRUCT_BEGIN
100 * Message used to ask a peer to validate receipt (to check an address
101 * from a HELLO). Followed by the address we are trying to validate,
102 * or an empty address if we are just sending a PING to confirm that a
103 * connection which the receiver (of the PING) initiated is still valid.
105 struct TransportPingMessage
109 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
111 struct GNUNET_MessageHeader header;
114 * Challenge code (to ensure fresh reply).
116 uint32_t challenge GNUNET_PACKED;
119 * Who is the intended recipient?
121 struct GNUNET_PeerIdentity target;
127 * Message used to validate a HELLO. The challenge is included in the
128 * confirmation to make matching of replies to requests possible. The
129 * signature signs our public key, an expiration time and our address.<p>
131 * This message is followed by our transport address that the PING tried
132 * to confirm (if we liked it). The address can be empty (zero bytes)
133 * if the PING had not address either (and we received the request via
134 * a connection that we initiated).
136 struct TransportPongMessage
140 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
142 struct GNUNET_MessageHeader header;
145 * Challenge code from PING (showing freshness). Not part of what
146 * is signed so that we can re-use signatures.
148 uint32_t challenge GNUNET_PACKED;
153 struct GNUNET_CRYPTO_EddsaSignature signature;
156 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
157 * plausible address for the signing peer.
159 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
162 * When does this signature expire?
164 struct GNUNET_TIME_AbsoluteNBO expiration;
167 * Size of address appended to this message (part of what is
168 * being signed, hence not redundant).
170 uint32_t addrlen GNUNET_PACKED;
173 GNUNET_NETWORK_STRUCT_END
176 * Information about an address under validation
178 struct ValidationEntry
184 struct GNUNET_HELLO_Address *address;
187 * Handle to the blacklist check (if we're currently in it).
189 struct GST_BlacklistCheck *bc;
192 * Public key of the peer.
194 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
197 * The identity of the peer. FIXME: duplicated (also in 'address')
199 struct GNUNET_PeerIdentity pid;
202 * Cached PONG signature
204 struct GNUNET_CRYPTO_EddsaSignature pong_sig_cache;
207 * ID of task that will clean up this entry if nothing happens.
209 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
212 * ID of task that will trigger address revalidation.
214 GNUNET_SCHEDULER_TaskIdentifier revalidation_task;
217 * At what time did we send the latest validation request (PING)?
219 struct GNUNET_TIME_Absolute send_time;
222 * At what time do we send the next validation request (PING)?
224 struct GNUNET_TIME_Absolute next_validation;
227 * Until when is this address valid?
228 * ZERO if it is not currently considered valid.
230 struct GNUNET_TIME_Absolute valid_until;
233 * Until when is the cached PONG signature valid?
234 * ZERO if it is not currently considered valid.
236 struct GNUNET_TIME_Absolute pong_sig_valid_until;
239 * How long until we can try to validate this address again?
240 * FOREVER if the address is for an unsupported plugin (from PEERINFO)
241 * ZERO if the address is considered valid (no validation needed)
242 * otherwise a time in the future if we're currently denying re-validation
244 struct GNUNET_TIME_Absolute revalidation_block;
247 * Last observed latency for this address (round-trip), delay between
248 * last PING sent and PONG received; FOREVER if we never got a PONG.
250 struct GNUNET_TIME_Relative latency;
253 * Current state of this validation entry
255 enum GNUNET_TRANSPORT_ValidationState state;
257 * Challenge number we used.
262 * When passing the address in 'add_valid_peer_address', did we
263 * copy the address to the HELLO yet?
268 * Are we currently using this address for a connection?
273 * Are we expecting a PONG message for this validation entry?
277 enum GNUNET_ATS_Network_Type network;
282 * Context of currently active requests to peerinfo
283 * for validation of HELLOs.
285 struct CheckHelloValidatedContext
289 * This is a doubly-linked list.
291 struct CheckHelloValidatedContext *next;
294 * This is a doubly-linked list.
296 struct CheckHelloValidatedContext *prev;
299 * Hello that we are validating.
301 const struct GNUNET_HELLO_Message *hello;
307 * Head of linked list of HELLOs awaiting validation.
309 static struct CheckHelloValidatedContext *chvc_head;
312 * Tail of linked list of HELLOs awaiting validation
314 static struct CheckHelloValidatedContext *chvc_tail;
317 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
318 * of the given peer that we are currently validating, have validated
319 * or are blocked from re-validation for a while).
321 static struct GNUNET_CONTAINER_MultiPeerMap *validation_map;
324 * Context for peerinfo iteration.
326 static struct GNUNET_PEERINFO_NotifyContext *pnc;
329 * Minimum delay between to validations
331 static struct GNUNET_TIME_Relative validation_delay;
334 * Number of validations running
336 static unsigned int validations_running;
339 * Validition fast start threshold
341 static unsigned int validations_fast_start_threshold;
344 * When is next validation allowed
346 static struct GNUNET_TIME_Absolute validation_next;
350 * Context for the validation entry match function.
352 struct ValidationEntryMatchContext
355 * Where to store the result?
357 struct ValidationEntry *ve;
360 * Address we're interested in.
362 const struct GNUNET_HELLO_Address *address;
368 * Iterate over validation entries until a matching one is found.
370 * @param cls the `struct ValidationEntryMatchContext *`
371 * @param key peer identity (unused)
372 * @param value a `struct ValidationEntry *` to match
373 * @return #GNUNET_YES if the entry does not match,
374 * #GNUNET_NO if the entry does match
377 validation_entry_match (void *cls,
378 const struct GNUNET_PeerIdentity *key,
381 struct ValidationEntryMatchContext *vemc = cls;
382 struct ValidationEntry *ve = value;
384 if (0 == GNUNET_HELLO_address_cmp (ve->address, vemc->address))
394 * A validation entry changed. Update the state and notify
397 * @param ve validation entry that changed
398 * @param state new state
401 validation_entry_changed (struct ValidationEntry *ve,
402 enum GNUNET_TRANSPORT_ValidationState state)
405 GST_clients_broadcast_validation_notification (&ve->pid,
415 * Iterate over validation entries and free them.
417 * @param cls (unused)
418 * @param key peer identity (unused)
419 * @param value a `struct ValidationEntry *` to clean up
420 * @return #GNUNET_YES (continue to iterate)
423 cleanup_validation_entry (void *cls,
424 const struct GNUNET_PeerIdentity *key,
427 struct ValidationEntry *ve = value;
429 ve->next_validation = GNUNET_TIME_absolute_get_zero_();
430 ve->valid_until = GNUNET_TIME_UNIT_ZERO_ABS;
432 /* Notify about deleted entry */
433 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_REMOVE);
437 GST_blacklist_test_cancel (ve->bc);
440 GNUNET_break (GNUNET_OK ==
441 GNUNET_CONTAINER_multipeermap_remove (validation_map,
443 GNUNET_HELLO_address_free (ve->address);
444 if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
446 GNUNET_SCHEDULER_cancel (ve->timeout_task);
447 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
449 if (GNUNET_SCHEDULER_NO_TASK != ve->revalidation_task)
451 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
452 ve->revalidation_task = GNUNET_SCHEDULER_NO_TASK;
454 if ((GNUNET_YES == ve->expecting_pong) &&
455 (validations_running > 0))
457 validations_running --;
458 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
459 "Validation finished, %u validation processes running\n",
460 validations_running);
468 * Address validation cleanup task. Assesses if the record is no
469 * longer valid and then possibly triggers its removal.
471 * @param cls the 'struct ValidationEntry'
472 * @param tc scheduler context (unused)
475 timeout_hello_validation (void *cls,
476 const struct GNUNET_SCHEDULER_TaskContext *tc)
478 struct ValidationEntry *ve = cls;
479 struct GNUNET_TIME_Absolute max;
480 struct GNUNET_TIME_Relative left;
482 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
483 max = GNUNET_TIME_absolute_max (ve->valid_until, ve->revalidation_block);
484 left = GNUNET_TIME_absolute_get_remaining (max);
485 if (left.rel_value_us > 0)
487 /* should wait a bit longer */
489 GNUNET_SCHEDULER_add_delayed (left, &timeout_hello_validation, ve);
492 GNUNET_STATISTICS_update (GST_stats,
493 gettext_noop ("# address records discarded"), 1,
495 cleanup_validation_entry (NULL, &ve->pid, ve);
500 * Function called with the result from blacklisting.
501 * Send a PING to the other peer if a communication is allowed.
503 * @param cls our 'struct ValidationEntry'
504 * @param pid identity of the other peer
505 * @param result #GNUNET_OK if the connection is allowed, #GNUNET_NO if not
508 transmit_ping_if_allowed (void *cls,
509 const struct GNUNET_PeerIdentity *pid,
512 struct ValidationEntry *ve = cls;
513 struct TransportPingMessage ping;
514 struct GNUNET_TRANSPORT_PluginFunctions *papi;
515 struct GNUNET_TIME_Absolute next;
516 const struct GNUNET_MessageHeader *hello;
517 enum GNUNET_ATS_Network_Type network;
524 if (GNUNET_NO == result)
526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
527 "Blacklist denies to send PING to `%s' `%s' `%s'\n",
529 GST_plugins_a2s (ve->address),
530 ve->address->transport_name);
534 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
535 "Transmitting plain PING to `%s' `%s' `%s'\n",
537 GST_plugins_a2s (ve->address),
538 ve->address->transport_name);
540 next = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(),
542 if (next.abs_value_us > validation_next.abs_value_us)
543 validation_next = next; /* We're going to send a PING so delay next validation */
545 slen = strlen (ve->address->transport_name) + 1;
546 hello = GST_hello_get ();
547 hsize = ntohs (hello->size);
549 sizeof (struct TransportPingMessage) + ve->address->address_length +
553 htons (sizeof (struct TransportPingMessage) +
554 ve->address->address_length + slen);
555 ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
556 ping.challenge = htonl (ve->challenge);
559 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
561 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
563 ("Not transmitting `%s' with `%s', message too big (%u bytes!). This should not happen.\n"),
564 "HELLO", "PING", (unsigned int) tsize);
565 /* message too big (!?), get rid of HELLO */
568 sizeof (struct TransportPingMessage) + ve->address->address_length +
572 char message_buf[tsize];
574 /* build message with structure:
575 * [HELLO][TransportPingMessage][Transport name][Address] */
576 memcpy (message_buf, hello, hsize);
577 memcpy (&message_buf[hsize], &ping, sizeof (struct TransportPingMessage));
578 memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
579 ve->address->transport_name, slen);
580 memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
581 ve->address->address, ve->address->address_length);
582 papi = GST_plugins_find (ve->address->transport_name);
587 GNUNET_assert (NULL != papi->send);
588 GNUNET_assert (NULL != papi->get_session);
589 struct Session * session = papi->get_session(papi->cls, ve->address);
593 ret = papi->send (papi->cls, session,
595 PING_PRIORITY, ACCEPTABLE_PING_DELAY,
597 network = papi->get_network (papi->cls, session);
598 if (GNUNET_ATS_NET_UNSPECIFIED == network)
600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
601 "Could not obtain a valid network for `%s' `%s'\n",
603 GST_plugins_a2s (ve->address));
606 GST_neighbours_notify_data_sent (pid, ve->address, session, tsize);
610 /* Could not get a valid session */
611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
612 "Could not get a valid session for `%s' `%s'\n",
614 GST_plugins_a2s (ve->address));
621 ve->send_time = GNUNET_TIME_absolute_get ();
622 GNUNET_STATISTICS_update (GST_stats,
624 ("# PING without HELLO messages sent"), 1,
627 ve->network = network;
628 ve->expecting_pong = GNUNET_YES;
629 validations_running++;
630 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
631 "Validation started, %u validation processes running\n",
632 validations_running);
633 /* Notify about PING sent */
634 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
640 * Do address validation again to keep address valid.
642 * @param cls the 'struct ValidationEntry'
643 * @param tc scheduler context (unused)
646 revalidate_address (void *cls,
647 const struct GNUNET_SCHEDULER_TaskContext *tc)
649 struct ValidationEntry *ve = cls;
650 struct GNUNET_TIME_Relative canonical_delay;
651 struct GNUNET_TIME_Relative delay;
652 struct GNUNET_TIME_Relative blocked_for;
653 struct GST_BlacklistCheck *bc;
656 ve->revalidation_task = GNUNET_SCHEDULER_NO_TASK;
657 delay = GNUNET_TIME_absolute_get_remaining (ve->revalidation_block);
658 /* How long until we can possibly permit the next PING? */
659 if (GNUNET_YES == ve->in_use)
660 canonical_delay = CONNECTED_PING_FREQUENCY;
661 else if (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value_us > 0)
662 canonical_delay = VALIDATED_PING_FREQUENCY;
664 canonical_delay = UNVALIDATED_PING_KEEPALIVE;
666 if (delay.rel_value_us > canonical_delay.rel_value_us * 2)
668 /* situation changed, recalculate delay */
669 delay = canonical_delay;
670 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (delay);
672 if (delay.rel_value_us > 0)
674 /* should wait a bit longer */
675 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
676 "Waiting for %s longer before validating address `%s'\n",
677 GNUNET_STRINGS_relative_time_to_string (delay,
679 GST_plugins_a2s (ve->address));
680 ve->revalidation_task =
681 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
682 ve->next_validation = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), delay);
685 blocked_for = GNUNET_TIME_absolute_get_remaining(validation_next);
686 if ((validations_running > validations_fast_start_threshold) &&
687 (blocked_for.rel_value_us > 0))
689 /* Validations are blocked, have to wait for blocked_for time */
690 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
691 "Validations blocked for another %s, delaying validating address `%s'\n",
692 GNUNET_STRINGS_relative_time_to_string (blocked_for,
694 GST_plugins_a2s (ve->address));
695 ve->revalidation_task =
696 GNUNET_SCHEDULER_add_delayed (blocked_for, &revalidate_address, ve);
697 ve->next_validation = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), blocked_for);
700 ve->revalidation_block = GNUNET_TIME_relative_to_absolute (canonical_delay);
702 /* schedule next PINGing with some extra random delay to avoid synchronous re-validations */
704 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
705 canonical_delay.rel_value_us);
707 delay = GNUNET_TIME_relative_add (canonical_delay,
708 GNUNET_TIME_relative_multiply
709 (GNUNET_TIME_UNIT_MICROSECONDS, rdelay));
711 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
712 "Validating now, next scheduled for %s, now validating address `%s'\n",
713 GNUNET_STRINGS_relative_time_to_string (blocked_for,
715 GST_plugins_a2s (ve->address));
716 ve->revalidation_task =
717 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
718 ve->next_validation = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), delay);
720 /* start PINGing by checking blacklist */
721 GNUNET_STATISTICS_update (GST_stats,
722 gettext_noop ("# address revalidations started"), 1,
724 bc = GST_blacklist_test_allowed (&ve->pid, ve->address->transport_name,
725 &transmit_ping_if_allowed, ve);
727 ve->bc = bc; /* only set 'bc' if 'transmit_ping_if_allowed' was not already
733 * Find a ValidationEntry entry for the given neighbour that matches
734 * the given address and transport. If none exists, create one (but
735 * without starting any validation).
737 * @param public_key public key of the peer, NULL for unknown
738 * @param address address to find
739 * @return validation entry matching the given specifications, NULL
740 * if we don't have an existing entry and no public key was given
742 static struct ValidationEntry *
743 find_validation_entry (const struct GNUNET_CRYPTO_EddsaPublicKey *public_key,
744 const struct GNUNET_HELLO_Address *address)
746 struct ValidationEntryMatchContext vemc;
747 struct ValidationEntry *ve;
750 vemc.address = address;
751 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
753 &validation_entry_match, &vemc);
754 if (NULL != (ve = vemc.ve))
756 if (public_key == NULL)
758 ve = GNUNET_new (struct ValidationEntry);
759 ve->in_use = GNUNET_SYSERR; /* not defined */
760 ve->address = GNUNET_HELLO_address_copy (address);
761 ve->public_key = *public_key;
762 ve->pid = address->peer;
763 ve->pong_sig_valid_until = GNUNET_TIME_absolute_get_zero_();
764 memset (&ve->pong_sig_cache, '\0', sizeof (struct GNUNET_CRYPTO_EddsaSignature));
765 ve->latency = GNUNET_TIME_UNIT_FOREVER_REL;
767 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
769 GNUNET_SCHEDULER_add_delayed (UNVALIDATED_PING_KEEPALIVE,
770 &timeout_hello_validation, ve);
771 GNUNET_CONTAINER_multipeermap_put (validation_map, &address->peer,
773 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
774 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_NEW);
775 ve->expecting_pong = GNUNET_NO;
781 * Iterator which adds the given address to the set of validated
784 * @param cls original HELLO message
785 * @param address the address
786 * @param expiration expiration time
787 * @return #GNUNET_OK (keep the address)
790 add_valid_address (void *cls,
791 const struct GNUNET_HELLO_Address *address,
792 struct GNUNET_TIME_Absolute expiration)
794 const struct GNUNET_HELLO_Message *hello = cls;
795 struct ValidationEntry *ve;
796 struct GNUNET_PeerIdentity pid;
797 struct GNUNET_ATS_Information ats;
798 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
800 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
801 return GNUNET_OK; /* expired */
802 if ((GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid)) ||
803 (GNUNET_OK != GNUNET_HELLO_get_key (hello, &public_key)))
806 return GNUNET_OK; /* invalid HELLO !? */
808 if (0 == memcmp (&GST_my_identity,
810 sizeof (struct GNUNET_PeerIdentity)))
812 /* Peerinfo returned own identity, skip validation */
816 ve = find_validation_entry (&public_key, address);
817 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until, expiration);
819 if (GNUNET_SCHEDULER_NO_TASK == ve->revalidation_task)
821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
822 "Starting revalidations for valid address `%s'\n",
823 GST_plugins_a2s (ve->address));
824 ve->next_validation = GNUNET_TIME_absolute_get();
825 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
827 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
829 ats.type = htonl (GNUNET_ATS_NETWORK_TYPE);
830 ats.value = htonl (ve->network);
831 GNUNET_ATS_address_add (GST_ats, address, NULL, &ats, 1);
838 * Function called for any HELLO known to PEERINFO.
841 * @param peer id of the peer, NULL for last call
842 * @param hello hello message for the peer (can be NULL)
843 * @param err_msg error message
846 process_peerinfo_hello (void *cls, const struct GNUNET_PeerIdentity *peer,
847 const struct GNUNET_HELLO_Message *hello,
850 GNUNET_assert (NULL != peer);
853 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
854 "Handling HELLO for peer `%s'\n",
856 GNUNET_assert (NULL ==
857 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
864 * Start the validation subsystem.
866 * @param max_fds maximum number of fds to use
869 GST_validation_start (unsigned int max_fds)
872 * Initialization for validation throttling
874 * We have a maximum number max_fds of connections we can use for validation
875 * We monitor the number of validations in parallel and start to throttle it
876 * when doing to many validations in parallel:
877 * if (running validations < (max_fds / 2))
878 * - "fast start": run validation immediately
879 * - have delay of (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2)
880 * (300 sec / ~150 == ~2 sec.) between two validations
883 validation_next = GNUNET_TIME_absolute_get();
884 validation_delay.rel_value_us = (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value_us) / (max_fds / 2);
885 validations_fast_start_threshold = (max_fds / 2);
886 validations_running = 0;
887 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
888 "Validation uses a fast start threshold of %u connections and a delay between of %s\n ",
889 validations_fast_start_threshold,
890 GNUNET_STRINGS_relative_time_to_string (validation_delay,
892 validation_map = GNUNET_CONTAINER_multipeermap_create (VALIDATION_MAP_SIZE,
894 pnc = GNUNET_PEERINFO_notify (GST_cfg, GNUNET_YES,
895 &process_peerinfo_hello, NULL);
900 * Stop the validation subsystem.
903 GST_validation_stop ()
905 struct CheckHelloValidatedContext *chvc;
907 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
908 &cleanup_validation_entry, NULL);
909 GNUNET_CONTAINER_multipeermap_destroy (validation_map);
910 validation_map = NULL;
911 while (NULL != (chvc = chvc_head))
913 GNUNET_CONTAINER_DLL_remove (chvc_head, chvc_tail, chvc);
916 GNUNET_PEERINFO_notify_cancel (pnc);
921 * Send the given PONG to the given address.
923 * @param cls the PONG message
924 * @param public_key public key for the peer, never NULL
925 * @param valid_until is ZERO if we never validated the address,
926 * otherwise a time up to when we consider it (or was) valid
927 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
928 * is ZERO if the address is considered valid (no validation needed)
929 * otherwise a time in the future if we're currently denying re-validation
930 * @param address target address
933 multicast_pong (void *cls,
934 const struct GNUNET_CRYPTO_EddsaPublicKey *public_key,
935 struct GNUNET_TIME_Absolute valid_until,
936 struct GNUNET_TIME_Absolute validation_block,
937 const struct GNUNET_HELLO_Address *address)
939 struct TransportPongMessage *pong = cls;
940 struct GNUNET_TRANSPORT_PluginFunctions *papi;
941 struct Session *session;
943 papi = GST_plugins_find (address->transport_name);
947 GNUNET_assert (NULL != papi->send);
948 GNUNET_assert (NULL != papi->get_session);
949 session = papi->get_session(papi->cls, address);
955 papi->send (papi->cls, session,
957 ntohs (pong->header.size),
959 ACCEPTABLE_PING_DELAY,
961 GST_neighbours_notify_data_sent (&address->peer,
970 * We've received a PING. If appropriate, generate a PONG.
972 * @param sender peer sending the PING
973 * @param hdr the PING
974 * @param sender_address the sender address as we got it
975 * @param session session we got the PING from
976 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
979 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
980 const struct GNUNET_MessageHeader *hdr,
981 const struct GNUNET_HELLO_Address *sender_address,
982 struct Session *session)
984 const struct TransportPingMessage *ping;
985 struct TransportPongMessage *pong;
986 struct GNUNET_TRANSPORT_PluginFunctions *papi;
987 struct GNUNET_CRYPTO_EddsaSignature *sig_cache;
988 struct GNUNET_TIME_Absolute *sig_cache_exp;
996 int buggy = GNUNET_NO;
997 struct GNUNET_HELLO_Address address;
999 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
1001 GNUNET_break_op (0);
1002 return GNUNET_SYSERR;
1004 ping = (const struct TransportPingMessage *) hdr;
1006 memcmp (&ping->target, &GST_my_identity,
1007 sizeof (struct GNUNET_PeerIdentity)))
1009 GNUNET_STATISTICS_update (GST_stats,
1011 ("# PING message for different peer received"), 1,
1013 return GNUNET_SYSERR;
1015 GNUNET_STATISTICS_update (GST_stats,
1016 gettext_noop ("# PING messages received"), 1,
1018 addr = (const char *) &ping[1];
1019 alen = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
1020 /* peer wants to confirm that this is one of our addresses, this is what is
1021 * used for address validation */
1024 sig_cache_exp = NULL;
1028 addrend = memchr (addr, '\0', alen);
1029 if (NULL == addrend)
1031 GNUNET_break_op (0);
1032 return GNUNET_SYSERR;
1035 slen = strlen (addr) + 1;
1037 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1038 address.address = addrend;
1039 address.address_length = alen;
1040 address.transport_name = addr;
1041 address.peer = GST_my_identity;
1043 if (NULL == address.transport_name)
1048 if (0 != strstr (address.transport_name, "_client"))
1050 plugin_name = GNUNET_strdup (address.transport_name);
1051 pos = strstr (plugin_name, "_client");
1052 GNUNET_assert (NULL != pos);
1053 GNUNET_snprintf (pos, strlen ("_server") + 1, "%s", "_server");
1056 plugin_name = GNUNET_strdup (address.transport_name);
1058 if (NULL == (papi = GST_plugins_find (plugin_name)))
1060 /* we don't have the plugin for this address */
1061 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1062 _("Plugin `%s' not available, cannot confirm having this address\n"),
1064 GNUNET_free (plugin_name);
1065 return GNUNET_SYSERR;
1067 GNUNET_free (plugin_name);
1068 if (GNUNET_OK != papi->check_address (papi->cls, addrend, alen))
1070 GNUNET_STATISTICS_update (GST_stats,
1072 ("# failed address checks during validation"), 1,
1074 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1075 _("Address `%s' is not one of my addresses, not confirming PING\n"),
1076 GST_plugins_a2s (&address));
1077 return GNUNET_SYSERR;
1081 GNUNET_STATISTICS_update (GST_stats,
1083 ("# successful address checks during validation"), 1,
1085 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1086 "Address `%s' is one of my addresses, confirming PING\n",
1087 GST_plugins_a2s (&address));
1090 if (GNUNET_YES != GST_hello_test_address (&address, &sig_cache, &sig_cache_exp))
1092 if (GNUNET_NO == buggy)
1094 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1095 _("Not confirming PING from peer `%s' with address `%s' since I cannot confirm having this address.\n"),
1096 GNUNET_i2s (sender),
1097 GST_plugins_a2s (&address));
1098 return GNUNET_SYSERR;
1102 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1103 _("Received a PING message with validation bug from `%s'\n"),
1104 GNUNET_i2s (sender));
1110 addrend = NULL; /* make gcc happy */
1112 static struct GNUNET_CRYPTO_EddsaSignature no_address_signature;
1113 static struct GNUNET_TIME_Absolute no_address_signature_expiration;
1115 sig_cache = &no_address_signature;
1116 sig_cache_exp = &no_address_signature_expiration;
1119 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1120 "I am `%s', sending PONG to peer `%s'\n",
1121 GNUNET_i2s_full (&GST_my_identity),
1122 GNUNET_i2s (sender));
1124 /* message with structure:
1125 * [TransportPongMessage][Transport name][Address] */
1127 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
1129 htons (sizeof (struct TransportPongMessage) + alen + slen);
1130 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
1131 pong->purpose.size =
1132 htonl (sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
1133 sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
1135 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
1136 memcpy (&pong->challenge, &ping->challenge, sizeof (ping->challenge));
1137 pong->addrlen = htonl (alen + slen);
1138 memcpy (&pong[1], addr, slen); /* Copy transport plugin */
1141 GNUNET_assert (NULL != addrend);
1142 memcpy (&((char *) &pong[1])[slen], addrend, alen);
1144 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value_us <
1145 PONG_SIGNATURE_LIFETIME.rel_value_us / 4)
1147 /* create / update cached sig */
1148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1149 "Creating PONG signature to indicate ownership.\n");
1150 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
1151 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1153 GNUNET_CRYPTO_eddsa_sign (GST_my_private_key, &pong->purpose,
1156 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1157 _("Failed to create PONG signature for peer `%s'\n"), GNUNET_i2s (sender));
1162 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
1164 pong->signature = *sig_cache;
1166 GNUNET_assert (sender_address != NULL);
1168 /* first see if the session we got this PING from can be used to transmit
1169 * a response reliably */
1174 GNUNET_assert (papi->send != NULL);
1175 GNUNET_assert (papi->get_session != NULL);
1177 if (session == NULL)
1179 session = papi->get_session (papi->cls, sender_address);
1181 if (session == NULL)
1188 ret = papi->send (papi->cls, session,
1189 (const char *) pong, ntohs (pong->header.size),
1190 PONG_PRIORITY, ACCEPTABLE_PING_DELAY,
1193 GST_neighbours_notify_data_sent (sender,
1194 sender_address, session,
1200 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1201 "Transmitted PONG to `%s' via reliable mechanism\n",
1202 GNUNET_i2s (sender));
1204 GNUNET_STATISTICS_update (GST_stats,
1206 ("# PONGs unicast via reliable transport"), 1,
1212 /* no reliable method found, try transmission via all known addresses */
1213 GNUNET_STATISTICS_update (GST_stats,
1215 ("# PONGs multicast to all available addresses"), 1,
1217 GST_validation_get_addresses (sender,
1218 &multicast_pong, pong);
1225 * Context for the #validate_address_iterator() function
1227 struct ValidateAddressContext
1230 * Hash of the public key of the peer whose address is being validated.
1232 struct GNUNET_PeerIdentity pid;
1235 * Public key of the peer whose address is being validated.
1237 struct GNUNET_CRYPTO_EddsaPublicKey public_key;
1243 * Iterator callback to go over all addresses and try to validate them
1244 * (unless blocked or already validated).
1246 * @param cls pointer to a `struct ValidateAddressContext *`
1247 * @param address the address
1248 * @param expiration expiration time
1249 * @return #GNUNET_OK (keep the address)
1252 validate_address_iterator (void *cls,
1253 const struct GNUNET_HELLO_Address *address,
1254 struct GNUNET_TIME_Absolute expiration)
1256 const struct ValidateAddressContext *vac = cls;
1257 struct GNUNET_TRANSPORT_PluginFunctions * papi;
1258 struct ValidationEntry *ve;
1259 struct GNUNET_TIME_Relative canonical_delay;
1261 if (0 == GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us)
1263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1264 "Skipping expired address from HELLO\n");
1265 return GNUNET_OK; /* expired */
1267 ve = find_validation_entry (&vac->public_key, address);
1269 papi = GST_plugins_find (ve->address->transport_name);
1272 /* This plugin is currently unvailable ... retry later */
1273 if (GNUNET_SCHEDULER_NO_TASK == ve->revalidation_task)
1275 if (GNUNET_YES == ve->in_use)
1276 canonical_delay = CONNECTED_PING_FREQUENCY;
1277 else if (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value_us > 0)
1278 canonical_delay = VALIDATED_PING_FREQUENCY;
1280 canonical_delay = UNVALIDATED_PING_KEEPALIVE;
1282 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1283 "Plugin `%s' unavailable, validation process for peer `%s' delayed for %llu ms\n",
1284 ve->address->transport_name,
1285 GNUNET_i2s (&ve->address->peer),
1286 (long long unsigned) canonical_delay.rel_value_us / 1000);
1288 ve->revalidation_task = GNUNET_SCHEDULER_add_delayed (canonical_delay,
1289 &revalidate_address, ve);
1295 if (GNUNET_SCHEDULER_NO_TASK == ve->revalidation_task)
1297 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1298 "Validation process started for fresh address `%s'\n",
1299 GST_plugins_a2s (ve->address));
1300 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1307 * Add the validated peer address to the HELLO.
1309 * @param cls the `struct ValidationEntry *` with the validated address
1310 * @param max space in @a buf
1311 * @param buf where to add the address
1312 * @return number of bytes written, #GNUNET_SYSERR to signal the
1313 * end of the iteration.
1316 add_valid_peer_address (void *cls,
1320 struct ValidationEntry *ve = cls;
1322 if (GNUNET_YES == ve->copied)
1323 return GNUNET_SYSERR; /* Done */
1324 ve->copied = GNUNET_YES;
1325 return GNUNET_HELLO_add_address (ve->address, ve->valid_until, buf, max);
1330 * We've received a PONG. Check if it matches a pending PING and
1331 * mark the respective address as confirmed.
1333 * @param sender peer sending the PONG
1334 * @param hdr the PONG
1335 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1338 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
1339 const struct GNUNET_MessageHeader *hdr)
1341 const struct TransportPongMessage *pong;
1342 struct ValidationEntry *ve;
1348 struct GNUNET_HELLO_Message *hello;
1349 struct GNUNET_HELLO_Address address;
1353 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
1355 GNUNET_break_op (0);
1356 return GNUNET_SYSERR;
1358 GNUNET_STATISTICS_update (GST_stats,
1359 gettext_noop ("# PONG messages received"), 1,
1362 /* message with structure:
1363 * [TransportPongMessage][Transport name][Address] */
1365 pong = (const struct TransportPongMessage *) hdr;
1366 tname = (const char *) &pong[1];
1367 size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
1368 addr = memchr (tname, '\0', size);
1371 GNUNET_break_op (0);
1372 return GNUNET_SYSERR;
1375 slen = strlen (tname) + 1;
1376 addrlen = size - slen;
1377 address.peer = *sender;
1378 address.address = addr;
1379 address.address_length = addrlen;
1380 address.transport_name = tname;
1381 address.local_info = GNUNET_HELLO_ADDRESS_INFO_NONE;
1382 ve = find_validation_entry (NULL, &address);
1383 if ((NULL == ve) || (GNUNET_NO == ve->expecting_pong))
1385 GNUNET_STATISTICS_update (GST_stats,
1387 ("# PONGs dropped, no matching pending validation"),
1391 /* now check that PONG is well-formed */
1392 if (0 != memcmp (&ve->pid, sender, sizeof (struct GNUNET_PeerIdentity)))
1394 GNUNET_break_op (0);
1395 return GNUNET_SYSERR;
1397 if (GNUNET_TIME_absolute_get_remaining
1398 (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value_us == 0)
1400 GNUNET_STATISTICS_update (GST_stats,
1402 ("# PONGs dropped, signature expired"), 1,
1404 return GNUNET_SYSERR;
1407 sig_res = GNUNET_SYSERR;
1408 do_verify = GNUNET_YES;
1409 if (0 != GNUNET_TIME_absolute_get_remaining (ve->pong_sig_valid_until).rel_value_us)
1411 /* We have a cached and valid signature for this peer,
1412 * try to compare instead of verify */
1413 if (0 == memcmp (&ve->pong_sig_cache, &pong->signature, sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
1415 /* signatures are identical, we can skip verification */
1416 sig_res = GNUNET_OK;
1417 do_verify = GNUNET_NO;
1421 sig_res = GNUNET_SYSERR;
1422 /* signatures do not match, we have to verify */
1426 if (GNUNET_YES == do_verify)
1428 /* Do expensive verification */
1429 sig_res = GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
1430 &pong->purpose, &pong->signature,
1432 if (sig_res == GNUNET_SYSERR)
1434 GNUNET_break_op (0);
1435 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1436 "Failed to verify: invalid signature on address `%s':%s from peer `%s'\n",
1438 GST_plugins_a2s (ve->address),
1439 GNUNET_i2s (sender));
1442 if (sig_res == GNUNET_SYSERR)
1444 GNUNET_break_op (0);
1445 return GNUNET_SYSERR;
1448 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1449 "Validation process successful for peer `%s' with plugin `%s' address `%s'\n",
1450 GNUNET_i2s (sender),
1452 GST_plugins_a2s (ve->address));
1453 /* validity achieved, remember it! */
1454 ve->expecting_pong = GNUNET_NO;
1455 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
1456 ve->pong_sig_cache = pong->signature;
1457 ve->pong_sig_valid_until = GNUNET_TIME_absolute_ntoh (pong->expiration);
1458 ve->latency = GNUNET_TIME_absolute_get_duration (ve->send_time);
1460 struct GNUNET_ATS_Information ats[2];
1462 ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DELAY);
1463 ats[0].value = htonl ((uint32_t) ve->latency.rel_value_us);
1464 ats[1].type = htonl (GNUNET_ATS_NETWORK_TYPE);
1465 ats[1].value = htonl ((uint32_t) ve->network);
1466 GNUNET_ATS_address_add (GST_ats, ve->address, NULL, ats, 2);
1468 if (validations_running > 0)
1470 validations_running --;
1471 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1472 "Validation finished, %u validation processes running\n",
1473 validations_running);
1480 /* Notify about new validity */
1481 validation_entry_changed (ve, GNUNET_TRANSPORT_VS_UPDATE);
1483 /* build HELLO to store in PEERINFO */
1484 ve->copied = GNUNET_NO;
1485 hello = GNUNET_HELLO_create (&ve->public_key,
1486 &add_valid_peer_address, ve,
1488 GNUNET_PEERINFO_add_peer (GST_peerinfo, hello, NULL, NULL);
1489 GNUNET_free (hello);
1495 * We've received a HELLO, check which addresses are new and trigger
1498 * @param hello the HELLO we received
1499 * @return #GNUNET_OK if the message was fine, #GNUNET_SYSERR on serious error
1502 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
1504 const struct GNUNET_HELLO_Message *hm =
1505 (const struct GNUNET_HELLO_Message *) hello;
1506 struct ValidateAddressContext vac;
1507 struct GNUNET_HELLO_Message *h;
1510 friend = GNUNET_HELLO_is_friend_only (hm);
1511 if ( ( (GNUNET_YES != friend) &&
1512 (GNUNET_NO != friend) ) ||
1513 (GNUNET_OK != GNUNET_HELLO_get_id (hm, &vac.pid)) ||
1514 (GNUNET_OK != GNUNET_HELLO_get_key (hm, &vac.public_key)))
1516 /* malformed HELLO */
1517 GNUNET_break_op (0);
1518 return GNUNET_SYSERR;
1521 memcmp (&GST_my_identity, &vac.pid, sizeof (struct GNUNET_PeerIdentity)))
1523 /* Add peer identity without addresses to peerinfo service */
1524 h = GNUNET_HELLO_create (&vac.public_key, NULL, NULL, friend);
1525 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1526 _("Validation received new %s message for peer `%s' with size %u\n"),
1528 GNUNET_i2s (&vac.pid),
1529 ntohs (hello->size));
1530 GNUNET_PEERINFO_add_peer (GST_peerinfo, h, NULL, NULL);
1532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1533 _("Adding `%s' without addresses for peer `%s'\n"), "HELLO",
1534 GNUNET_i2s (&vac.pid));
1537 GNUNET_assert (NULL ==
1538 GNUNET_HELLO_iterate_addresses (hm, GNUNET_NO,
1539 &validate_address_iterator,
1546 * Closure for #iterate_addresses().
1548 struct IteratorContext
1551 * Function to call on each address.
1553 GST_ValidationAddressCallback cb;
1556 * Closure for @e cb.
1564 * Call the callback in the closure for each validation entry.
1566 * @param cls the `struct IteratorContext`
1567 * @param key the peer's identity
1568 * @param value the `struct ValidationEntry`
1569 * @return #GNUNET_OK (continue to iterate)
1572 iterate_addresses (void *cls,
1573 const struct GNUNET_PeerIdentity *key,
1576 struct IteratorContext *ic = cls;
1577 struct ValidationEntry *ve = value;
1579 ic->cb (ic->cb_cls, &ve->public_key, ve->valid_until, ve->revalidation_block,
1586 * Call the given function for each address for the given target.
1587 * Can either give a snapshot (synchronous API) or be continuous.
1589 * @param target peer information is requested for
1590 * @param cb function to call; will not be called after this function returns
1591 * @param cb_cls closure for @a cb
1594 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1595 GST_ValidationAddressCallback cb, void *cb_cls)
1597 struct IteratorContext ic;
1601 GNUNET_CONTAINER_multipeermap_get_multiple (validation_map,
1603 &iterate_addresses, &ic);
1608 * Update if we are using an address for a connection actively right now.
1609 * Based on this, the validation module will measure latency for the
1610 * address more or less often.
1612 * @param address the address
1613 * @param session the session
1614 * @param in_use #GNUNET_YES if we are now using the address for a connection,
1615 * #GNUNET_NO if we are no longer using the address for a connection
1618 GST_validation_set_address_use (const struct GNUNET_HELLO_Address *address,
1619 struct Session *session,
1622 struct ValidationEntry *ve;
1624 if (NULL != address)
1625 ve = find_validation_entry (NULL, address);
1627 ve = NULL; /* FIXME: lookup based on session... */
1630 /* this can happen for inbound connections (sender_address_len == 0); */
1633 if (ve->in_use == in_use)
1636 if (GNUNET_YES == in_use)
1638 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1639 "Error setting address in use for peer `%s' `%s' to USED\n",
1640 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
1642 if (GNUNET_NO == in_use)
1644 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1645 "Error setting address in use for peer `%s' `%s' to NOT_USED\n",
1646 GNUNET_i2s (&address->peer), GST_plugins_a2s (address));
1650 GNUNET_break (ve->in_use != in_use); /* should be different... */
1651 ve->in_use = in_use;
1652 if (in_use == GNUNET_YES)
1654 /* from now on, higher frequeny, so reschedule now */
1655 GNUNET_SCHEDULER_cancel (ve->revalidation_task);
1656 ve->revalidation_task = GNUNET_SCHEDULER_add_now (&revalidate_address, ve);
1662 * Query validation about the latest observed latency on a given
1665 * @param sender peer
1666 * @param address the address
1667 * @param session session
1668 * @return observed latency of the address, FOREVER if the address was
1669 * never successfully validated
1671 struct GNUNET_TIME_Relative
1672 GST_validation_get_address_latency (const struct GNUNET_PeerIdentity *sender,
1673 const struct GNUNET_HELLO_Address *address,
1674 struct Session *session)
1676 struct ValidationEntry *ve;
1678 if (NULL == address)
1680 GNUNET_break (0); // FIXME: support having latency only with session...
1681 return GNUNET_TIME_UNIT_FOREVER_REL;
1683 ve = find_validation_entry (NULL, address);
1685 return GNUNET_TIME_UNIT_FOREVER_REL;
1690 * Closure for the validation_entries_iterate function.
1692 struct ValidationIteratorContext
1695 * Function to call on each validation entry
1697 GST_ValidationChangedCallback cb;
1700 * Closure for @e cb.
1707 validation_entries_iterate (void *cls,
1708 const struct GNUNET_PeerIdentity *key,
1711 struct ValidationIteratorContext *ic = cls;
1712 struct ValidationEntry *ve = value;
1714 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Notifying about validation entry for peer `%s' address `%s' \n",
1715 GNUNET_i2s (&ve->pid), GST_plugins_a2s (ve->address));
1716 ic->cb (ic->cb_cls, &ve->pid, ve->address, ve->send_time,
1717 ve->valid_until, ve->next_validation, ve->state);
1723 * Iterate over all iteration entries
1725 * @param cb function to call
1726 * @param cb_cls closure for cb
1729 GST_validation_iterate (GST_ValidationChangedCallback cb,
1732 struct ValidationIteratorContext ic;
1734 if (NULL == validation_map)
1735 return; /* can happen during shutdown */
1738 GNUNET_CONTAINER_multipeermap_iterate (validation_map,
1739 &validation_entries_iterate,
1743 /* end of file gnunet-service-transport_validation.c */