2 This file is part of GNUnet.
3 (C) 2010,2011 Christian Grothoff (and other contributing authors)
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22 * @file transport/gnunet-service-transport_validation.c
23 * @brief address validation subsystem
24 * @author Christian Grothoff
27 #include "gnunet-service-transport_validation.h"
28 #include "gnunet-service-transport_plugins.h"
29 #include "gnunet-service-transport_hello.h"
30 #include "gnunet-service-transport_blacklist.h"
31 #include "gnunet-service-transport.h"
32 #include "gnunet_hello_lib.h"
33 #include "gnunet_ats_service.h"
34 #include "gnunet_peerinfo_service.h"
35 #include "gnunet_signatures.h"
37 // TODO: observe latency between PING/PONG and give information to ATS!
40 * How long is a PONG signature valid? We'll recycle a signature until
41 * 1/4 of this time is remaining. PONGs should expire so that if our
42 * external addresses change an adversary cannot replay them indefinitely.
43 * OTOH, we don't want to spend too much time generating PONG signatures,
44 * so they must have some lifetime to reduce our CPU usage.
46 #define PONG_SIGNATURE_LIFETIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
49 * After how long do we expire an address in a HELLO that we just
50 * validated? This value is also used for our own addresses when we
53 #define HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
56 * How long before an existing address expires should we again try to
57 * validate it? Must be (significantly) smaller than
58 * HELLO_ADDRESS_EXPIRATION.
60 #define HELLO_REVALIDATION_START_TIME GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 1)
63 * Size of the validation map hashmap.
65 #define VALIDATION_MAP_SIZE 256
68 * Priority to use for PINGs
70 #define PING_PRIORITY 2
73 * Priority to use for PONGs
75 #define PONG_PRIORITY 4
79 * Message used to ask a peer to validate receipt (to check an address
80 * from a HELLO). Followed by the address we are trying to validate,
81 * or an empty address if we are just sending a PING to confirm that a
82 * connection which the receiver (of the PING) initiated is still valid.
84 struct TransportPingMessage
88 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PING
90 struct GNUNET_MessageHeader header;
93 * Challenge code (to ensure fresh reply).
95 uint32_t challenge GNUNET_PACKED;
98 * Who is the intended recipient?
100 struct GNUNET_PeerIdentity target;
106 * Message used to validate a HELLO. The challenge is included in the
107 * confirmation to make matching of replies to requests possible. The
108 * signature signs our public key, an expiration time and our address.<p>
110 * This message is followed by our transport address that the PING tried
111 * to confirm (if we liked it). The address can be empty (zero bytes)
112 * if the PING had not address either (and we received the request via
113 * a connection that we initiated).
115 struct TransportPongMessage
119 * Type will be GNUNET_MESSAGE_TYPE_TRANSPORT_PONG
121 struct GNUNET_MessageHeader header;
124 * Challenge code from PING (showing freshness). Not part of what
125 * is signed so that we can re-use signatures.
127 uint32_t challenge GNUNET_PACKED;
132 struct GNUNET_CRYPTO_RsaSignature signature;
135 * GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN to confirm that this is a
136 * plausible address for the signing peer.
138 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
141 * When does this signature expire?
143 struct GNUNET_TIME_AbsoluteNBO expiration;
146 * Size of address appended to this message (part of what is
147 * being signed, hence not redundant).
149 uint32_t addrlen GNUNET_PACKED;
155 * Information about an address under validation
157 struct ValidationEntry
161 * Name of the transport.
163 char *transport_name;
166 * The address, actually a pointer to the end
167 * of this struct. Do not free!
172 * Handle to the blacklist check (if we're currently in it).
174 struct GST_BlacklistCheck *bc;
177 * Public key of the peer.
179 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
182 * The identity of the peer.
184 struct GNUNET_PeerIdentity pid;
187 * ID of task that will clean up this entry if nothing happens.
189 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
192 * At what time did we send the latest validation request?
194 struct GNUNET_TIME_Absolute send_time;
197 * Until when is this address valid?
198 * ZERO if it is not currently considered valid.
200 struct GNUNET_TIME_Absolute valid_until;
203 * How long until we can try to validate this address again?
204 * FOREVER if the address is for an unsupported plugin (from PEERINFO)
205 * ZERO if the address is considered valid (no validation needed)
206 * otherwise a time in the future if we're currently denying re-validation
208 struct GNUNET_TIME_Absolute validation_block;
211 * Challenge number we used.
224 * Context of currently active requests to peerinfo
225 * for validation of HELLOs.
227 struct CheckHelloValidatedContext
231 * This is a doubly-linked list.
233 struct CheckHelloValidatedContext *next;
236 * This is a doubly-linked list.
238 struct CheckHelloValidatedContext *prev;
241 * Hello that we are validating.
243 const struct GNUNET_HELLO_Message *hello;
249 * Head of linked list of HELLOs awaiting validation.
251 static struct CheckHelloValidatedContext *chvc_head;
254 * Tail of linked list of HELLOs awaiting validation
256 static struct CheckHelloValidatedContext *chvc_tail;
259 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
260 * of the given peer that we are currently validating, have validated
261 * or are blocked from re-validation for a while).
263 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
266 * Context for peerinfo iteration.
268 static struct GNUNET_PEERINFO_NotifyContext *pnc;
272 * Context for the validation entry match function.
274 struct ValidationEntryMatchContext
277 * Where to store the result?
279 struct ValidationEntry *ve;
282 * Transport name we're looking for.
284 const char *transport_name;
287 * Address we're interested in.
292 * Number of bytes in 'addr'.
299 * Iterate over validation entries until a matching one is found.
301 * @param cls the 'struct ValidationEntryMatchContext'
302 * @param key peer identity (unused)
303 * @param value a 'struct ValidationEntry' to match
304 * @return GNUNET_YES if the entry does not match,
305 * GNUNET_NO if the entry does match
308 validation_entry_match (void *cls, const GNUNET_HashCode * key, void *value)
310 struct ValidationEntryMatchContext *vemc = cls;
311 struct ValidationEntry *ve = value;
313 if ((ve->addrlen == vemc->addrlen) &&
314 (0 == memcmp (ve->addr, vemc->addr, ve->addrlen)) &&
315 (0 == strcmp (ve->transport_name, vemc->transport_name)))
325 * Find a ValidationEntry entry for the given neighbour that matches
326 * the given address and transport. If none exists, create one (but
327 * without starting any validation).
329 * @param public_key public key of the peer, NULL for unknown
330 * @param neighbour which peer we care about
331 * @param tname name of the transport plugin
332 * @param session session to look for, NULL for 'any'; otherwise
333 * can be used for the service to "learn" this session ID
335 * @param addr binary address
336 * @param addrlen length of addr
337 * @return validation entry matching the given specifications, NULL
338 * if we don't have an existing entry and no public key was given
340 static struct ValidationEntry *
341 find_validation_entry (const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
342 *public_key, const struct GNUNET_PeerIdentity *neighbour,
343 const char *tname, const char *addr, size_t addrlen)
345 struct ValidationEntryMatchContext vemc;
346 struct ValidationEntry *ve;
349 vemc.transport_name = tname;
351 vemc.addrlen = addrlen;
352 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
353 &neighbour->hashPubKey,
354 &validation_entry_match, &vemc);
355 if (NULL != (ve = vemc.ve))
357 if (public_key == NULL)
359 ve = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
360 ve->transport_name = GNUNET_strdup (tname);
361 ve->addr = (void *) &ve[1];
362 ve->public_key = *public_key;
363 ve->pid = *neighbour;
365 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
366 memcpy (&ve[1], addr, addrlen);
367 ve->addrlen = addrlen;
368 GNUNET_CONTAINER_multihashmap_put (validation_map, &neighbour->hashPubKey, ve,
369 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
375 * Iterator which adds the given address to the set of validated
378 * @param cls original HELLO message
379 * @param tname name of the transport
380 * @param expiration expiration time
381 * @param addr the address
382 * @param addrlen length of the address
383 * @return GNUNET_OK (keep the address)
386 add_valid_address (void *cls, const char *tname,
387 struct GNUNET_TIME_Absolute expiration, const void *addr,
390 const struct GNUNET_HELLO_Message *hello = cls;
391 struct ValidationEntry *ve;
392 struct GNUNET_PeerIdentity pid;
393 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
395 if (GNUNET_TIME_absolute_get_remaining (expiration).rel_value == 0)
396 return GNUNET_OK; /* expired */
397 if ((GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid)) ||
398 (GNUNET_OK != GNUNET_HELLO_get_key (hello, &public_key)))
401 return GNUNET_OK; /* invalid HELLO !? */
403 ve = find_validation_entry (&public_key, &pid, tname, addr, addrlen);
404 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until, expiration);
405 GNUNET_ATS_address_update (GST_ats, &pid, ve->valid_until, tname, NULL, addr,
412 * Function called for any HELLO known to PEERINFO.
415 * @param peer id of the peer, NULL for last call
416 * @param hello hello message for the peer (can be NULL)
417 * @param error message
420 process_peerinfo_hello (void *cls, const struct GNUNET_PeerIdentity *peer,
421 const struct GNUNET_HELLO_Message *hello,
424 GNUNET_assert (NULL != peer);
427 GNUNET_assert (NULL ==
428 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
435 * Start the validation subsystem.
438 GST_validation_start ()
440 validation_map = GNUNET_CONTAINER_multihashmap_create (VALIDATION_MAP_SIZE);
441 pnc = GNUNET_PEERINFO_notify (GST_cfg, &process_peerinfo_hello, NULL);
446 * Iterate over validation entries and free them.
448 * @param cls (unused)
449 * @param key peer identity (unused)
450 * @param value a 'struct ValidationEntry' to clean up
451 * @return GNUNET_YES (continue to iterate)
454 cleanup_validation_entry (void *cls, const GNUNET_HashCode * key, void *value)
456 struct ValidationEntry *ve = value;
460 GST_blacklist_test_cancel (ve->bc);
463 GNUNET_break (GNUNET_OK ==
464 GNUNET_CONTAINER_multihashmap_remove (validation_map,
465 &ve->pid.hashPubKey, ve));
466 GNUNET_free (ve->transport_name);
467 if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
469 GNUNET_SCHEDULER_cancel (ve->timeout_task);
470 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
478 * Stop the validation subsystem.
481 GST_validation_stop ()
483 struct CheckHelloValidatedContext *chvc;
485 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
486 &cleanup_validation_entry, NULL);
487 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
488 validation_map = NULL;
489 while (NULL != (chvc = chvc_head))
491 GNUNET_CONTAINER_DLL_remove (chvc_head, chvc_tail, chvc);
494 GNUNET_PEERINFO_notify_cancel (pnc);
499 * Address validation cleanup task (record no longer needed).
501 * @param cls the 'struct ValidationEntry'
502 * @param tc scheduler context (unused)
505 timeout_hello_validation (void *cls,
506 const struct GNUNET_SCHEDULER_TaskContext *tc)
508 struct ValidationEntry *ve = cls;
510 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
511 GNUNET_STATISTICS_update (GST_stats,
512 gettext_noop ("# address records discarded"), 1,
514 cleanup_validation_entry (NULL, &ve->pid.hashPubKey, ve);
519 * Send the given PONG to the given address.
521 * @param cls the PONG message
522 * @param public_key public key for the peer, never NULL
523 * @param target peer this change is about, never NULL
524 * @param valid_until is ZERO if we never validated the address,
525 * otherwise a time up to when we consider it (or was) valid
526 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
527 * is ZERO if the address is considered valid (no validation needed)
528 * otherwise a time in the future if we're currently denying re-validation
529 * @param plugin_name name of the plugin
530 * @param plugin_address binary address
531 * @param plugin_address_len length of address
534 multicast_pong (void *cls,
535 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
536 *public_key, const struct GNUNET_PeerIdentity *target,
537 struct GNUNET_TIME_Absolute valid_until,
538 struct GNUNET_TIME_Absolute validation_block,
539 const char *plugin_name, const void *plugin_address,
540 size_t plugin_address_len)
542 struct TransportPongMessage *pong = cls;
543 struct GNUNET_TRANSPORT_PluginFunctions *papi;
545 papi = GST_plugins_find (plugin_name);
548 (void) papi->send (papi->cls, target, (const char *) pong,
549 ntohs (pong->header.size), PONG_PRIORITY,
550 HELLO_REVALIDATION_START_TIME, NULL, plugin_address,
551 plugin_address_len, GNUNET_YES, NULL, NULL);
556 * We've received a PING. If appropriate, generate a PONG.
558 * @param sender peer sending the PING
559 * @param hdr the PING
560 * @param session session we got the PING from
561 * @param plugin_name name of plugin that received the PING
562 * @param sender_address address of the sender as known to the plugin, NULL
563 * if we did not initiate the connection
564 * @param sender_address_len number of bytes in sender_address
567 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
568 const struct GNUNET_MessageHeader *hdr,
569 const char *plugin_name, struct Session *session,
570 const void *sender_address,
571 size_t sender_address_len)
573 const struct TransportPingMessage *ping;
574 struct TransportPongMessage *pong;
575 struct GNUNET_TRANSPORT_PluginFunctions *papi;
576 struct GNUNET_CRYPTO_RsaSignature *sig_cache;
577 struct GNUNET_TIME_Absolute *sig_cache_exp;
584 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
589 ping = (const struct TransportPingMessage *) hdr;
591 memcmp (&ping->target, &GST_my_identity,
592 sizeof (struct GNUNET_PeerIdentity)))
597 GNUNET_STATISTICS_update (GST_stats,
598 gettext_noop ("# PING messages received"), 1,
600 addr = (const char *) &ping[1];
601 alen = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
602 /* peer wants to confirm that this is one of our addresses, this is what is
603 * used for address validation */
605 addrend = memchr (addr, '\0', alen);
612 slen = strlen (addr);
616 GST_hello_test_address (addr, addrend, alen, &sig_cache, &sig_cache_exp))
618 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
620 ("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
621 GST_plugins_a2s (addr, addrend, alen));
625 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
627 htons (sizeof (struct TransportPongMessage) + alen + slen);
628 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
630 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
631 sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
633 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
634 pong->challenge = ping->challenge;
635 pong->addrlen = htonl (alen + slen);
636 memcpy (&pong[1], addr, slen);
637 memcpy (&((char *) &pong[1])[slen], addrend, alen);
638 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value <
639 PONG_SIGNATURE_LIFETIME.rel_value / 4)
641 /* create / update cached sig */
643 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
644 "Creating PONG signature to indicate ownership.\n");
646 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
647 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
648 GNUNET_assert (GNUNET_OK ==
649 GNUNET_CRYPTO_rsa_sign (GST_my_private_key, &pong->purpose,
654 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
656 pong->signature = *sig_cache;
658 /* first see if the session we got this PING from can be used to transmit
659 * a response reliably */
660 papi = GST_plugins_find (plugin_name);
665 papi->send (papi->cls, sender, (const char *) pong,
666 ntohs (pong->header.size), PONG_PRIORITY,
667 HELLO_REVALIDATION_START_TIME, session, sender_address,
668 sender_address_len, GNUNET_SYSERR, NULL, NULL);
671 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
672 "Transmitted PONG to `%s' via reliable mechanism\n",
673 GNUNET_i2s (sender));
675 GNUNET_STATISTICS_update (GST_stats,
677 ("# PONGs unicast via reliable transport"), 1,
683 /* no reliable method found, try transmission via all known addresses */
684 GNUNET_STATISTICS_update (GST_stats,
686 ("# PONGs multicast to all available addresses"), 1,
688 GST_validation_get_addresses (sender, &multicast_pong, pong);
694 * Context for the 'validate_address' function
696 struct ValidateAddressContext
699 * Hash of the public key of the peer whose address is being validated.
701 struct GNUNET_PeerIdentity pid;
704 * Public key of the peer whose address is being validated.
706 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
711 * Function called with the result from blacklisting.
712 * Send a PING to the other peer if a communication is allowed.
714 * @param cls ou r'struct ValidationEntry'
715 * @param pid identity of the other peer
716 * @param result GNUNET_OK if the connection is allowed, GNUNET_NO if not
719 transmit_ping_if_allowed (void *cls, const struct GNUNET_PeerIdentity *pid,
722 struct ValidationEntry *ve = cls;
723 struct TransportPingMessage ping;
724 struct GNUNET_TRANSPORT_PluginFunctions *papi;
725 const struct GNUNET_MessageHeader *hello;
732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting plain PING to `%s'\n",
734 ping.header.size = htons (sizeof (struct TransportPingMessage));
735 ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
736 ping.challenge = htonl (ve->challenge);
739 slen = strlen (ve->transport_name) + 1;
740 hello = GST_hello_get ();
741 hsize = ntohs (hello->size);
742 tsize = sizeof (struct TransportPingMessage) + ve->addrlen + slen + hsize;
743 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
745 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
747 ("Not transmitting `%s' with `%s', message too big (%u bytes!). This should not happen.\n"),
748 "HELLO", "PING", (unsigned int) tsize);
749 /* message too big (!?), get rid of HELLO */
751 tsize = sizeof (struct TransportPingMessage) + ve->addrlen + slen + hsize;
754 char message_buf[tsize];
756 memcpy (message_buf, hello, hsize);
757 memcpy (&message_buf[hsize], &ping, sizeof (struct TransportPingMessage));
758 memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
759 ve->transport_name, slen);
760 memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
761 ve->addr, ve->addrlen);
762 papi = GST_plugins_find (ve->transport_name);
767 papi->send (papi->cls, pid, message_buf, tsize, PING_PRIORITY,
768 HELLO_REVALIDATION_START_TIME, NULL /* no session */ ,
769 ve->addr, ve->addrlen, GNUNET_YES, NULL, NULL);
773 ve->send_time = GNUNET_TIME_absolute_get ();
774 GNUNET_STATISTICS_update (GST_stats,
776 ("# PING without HELLO messages sent"), 1,
783 * Iterator callback to go over all addresses and try to validate them
784 * (unless blocked or already validated).
786 * @param cls pointer to a 'struct ValidateAddressContext'
787 * @param tname name of the transport
788 * @param expiration expiration time
789 * @param addr the address
790 * @param addrlen length of the address
791 * @return GNUNET_OK (keep the address)
794 validate_address (void *cls, const char *tname,
795 struct GNUNET_TIME_Absolute expiration, const void *addr,
798 const struct ValidateAddressContext *vac = cls;
799 const struct GNUNET_PeerIdentity *pid = &vac->pid;
800 struct ValidationEntry *ve;
801 struct GST_BlacklistCheck *bc;
803 if (GNUNET_TIME_absolute_get_remaining (expiration).rel_value == 0)
804 return GNUNET_OK; /* expired */
805 ve = find_validation_entry (&vac->public_key, pid, tname, addr, addrlen);
806 if (GNUNET_TIME_absolute_get_remaining (ve->validation_block).rel_value > 0)
807 return GNUNET_OK; /* blocked */
808 if ((GNUNET_SCHEDULER_NO_TASK != ve->timeout_task) &&
809 (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value > 0))
810 return GNUNET_OK; /* revalidation task already scheduled & still valid */
811 ve->validation_block =
812 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME);
813 if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
814 GNUNET_SCHEDULER_cancel (ve->timeout_task);
816 GNUNET_SCHEDULER_add_delayed (HELLO_REVALIDATION_START_TIME,
817 &timeout_hello_validation, ve);
818 bc = GST_blacklist_test_allowed (pid, tname, &transmit_ping_if_allowed, ve);
826 * Do address validation again to keep address valid.
828 * @param cls the 'struct ValidationEntry'
829 * @param tc scheduler context (unused)
832 revalidate_address (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
834 struct ValidationEntry *ve = cls;
835 struct GNUNET_TIME_Relative delay;
836 struct ValidateAddressContext vac;
838 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
839 delay = GNUNET_TIME_absolute_get_remaining (ve->validation_block);
840 if (delay.rel_value > 0)
842 /* should wait a bit longer */
844 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
847 GNUNET_STATISTICS_update (GST_stats,
848 gettext_noop ("# address revalidations started"), 1,
851 vac.public_key = ve->public_key;
852 validate_address (&vac, ve->transport_name, ve->valid_until, ve->addr,
853 (uint16_t) ve->addrlen);
858 * Add the validated peer address to the HELLO.
860 * @param cls the 'struct ValidationEntry' with the validated address
861 * @param max space in buf
862 * @param buf where to add the address
865 add_valid_peer_address (void *cls, size_t max, void *buf)
867 struct ValidationEntry *ve = cls;
869 return GNUNET_HELLO_add_address (ve->transport_name, ve->valid_until,
870 ve->addr, ve->addrlen, buf, max);
875 * We've received a PONG. Check if it matches a pending PING and
876 * mark the respective address as confirmed.
878 * @param sender peer sending the PONG
879 * @param hdr the PONG
882 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
883 const struct GNUNET_MessageHeader *hdr)
885 const struct TransportPongMessage *pong;
886 struct ValidationEntry *ve;
892 struct GNUNET_TIME_Relative delay;
893 struct GNUNET_HELLO_Message *hello;
895 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
900 GNUNET_STATISTICS_update (GST_stats,
901 gettext_noop ("# PONG messages received"), 1,
903 pong = (const struct TransportPongMessage *) hdr;
904 addr = (const char *) &pong[1];
905 alen = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
906 addrend = memchr (addr, '\0', alen);
913 slen = strlen (addr);
915 ve = find_validation_entry (NULL, sender, addr, addrend, alen);
918 GNUNET_STATISTICS_update (GST_stats,
920 ("# PONGs dropped, no matching pending validation"),
924 /* now check that PONG is well-formed */
925 if (0 != memcmp (&ve->pid, sender, sizeof (struct GNUNET_PeerIdentity)))
931 if (GNUNET_TIME_absolute_get_remaining
932 (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value == 0)
934 GNUNET_STATISTICS_update (GST_stats,
936 ("# PONGs dropped, signature expired"), 1,
941 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
942 &pong->purpose, &pong->signature,
949 /* validity achieved, remember it! */
950 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
951 GNUNET_ATS_address_update (GST_ats, &ve->pid, ve->valid_until, ve->transport_name, NULL, ve->addr, ve->addrlen, NULL, 0); /* FIXME: compute and add latency here... */
953 /* build HELLO to store in PEERINFO */
954 hello = GNUNET_HELLO_create (&ve->public_key, &add_valid_peer_address, ve);
955 GNUNET_PEERINFO_add_peer (GST_peerinfo, hello);
958 if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
959 GNUNET_SCHEDULER_cancel (ve->timeout_task);
961 /* randomly delay by up to 1h to avoid synchronous validations */
962 rdelay = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 60 * 60);
964 GNUNET_TIME_relative_add (HELLO_REVALIDATION_START_TIME,
965 GNUNET_TIME_relative_multiply
966 (GNUNET_TIME_UNIT_SECONDS, rdelay));
968 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
973 * We've received a HELLO, check which addresses are new and trigger
976 * @param hello the HELLO we received
979 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
981 const struct GNUNET_HELLO_Message *hm =
982 (const struct GNUNET_HELLO_Message *) hello;
983 struct ValidateAddressContext vac;
985 if ((GNUNET_OK != GNUNET_HELLO_get_id (hm, &vac.pid)) ||
986 (GNUNET_OK != GNUNET_HELLO_get_key (hm, &vac.public_key)))
988 /* malformed HELLO */
992 GNUNET_assert (NULL ==
993 GNUNET_HELLO_iterate_addresses (hm, GNUNET_NO,
994 &validate_address, &vac));
999 * Closure for 'iterate_addresses'
1001 struct IteratorContext
1004 * Function to call on each address.
1006 GST_ValidationAddressCallback cb;
1017 * Call the callback in the closure for each validation entry.
1019 * @param cls the 'struct GST_ValidationIteratorContext'
1020 * @param key the peer's identity
1021 * @param value the 'struct ValidationEntry'
1022 * @return GNUNET_OK (continue to iterate)
1025 iterate_addresses (void *cls, const GNUNET_HashCode * key, void *value)
1027 struct IteratorContext *ic = cls;
1028 struct ValidationEntry *ve = value;
1030 ic->cb (ic->cb_cls, &ve->public_key, &ve->pid, ve->valid_until,
1031 ve->validation_block, ve->transport_name, ve->addr, ve->addrlen);
1037 * Call the given function for each address for the given target.
1038 * Can either give a snapshot (synchronous API) or be continuous.
1040 * @param target peer information is requested for
1041 * @param snapshot_only GNUNET_YES to iterate over addresses once, GNUNET_NO to
1042 * continue to give information about addresses as it evolves
1043 * @param cb function to call; will not be called after this function returns
1044 * if snapshot_only is GNUNET_YES
1045 * @param cb_cls closure for 'cb'
1046 * @return context to cancel, NULL if 'snapshot_only' is GNUNET_YES
1049 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1050 GST_ValidationAddressCallback cb, void *cb_cls)
1052 struct IteratorContext ic;
1056 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
1057 &target->hashPubKey,
1058 &iterate_addresses, &ic);
1062 /* end of file gnunet-service-transport_validation.c */