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.
221 * When passing the address in 'add_valid_peer_address', did we
222 * copy the address to the HELLO yet?
230 * Context of currently active requests to peerinfo
231 * for validation of HELLOs.
233 struct CheckHelloValidatedContext
237 * This is a doubly-linked list.
239 struct CheckHelloValidatedContext *next;
242 * This is a doubly-linked list.
244 struct CheckHelloValidatedContext *prev;
247 * Hello that we are validating.
249 const struct GNUNET_HELLO_Message *hello;
255 * Head of linked list of HELLOs awaiting validation.
257 static struct CheckHelloValidatedContext *chvc_head;
260 * Tail of linked list of HELLOs awaiting validation
262 static struct CheckHelloValidatedContext *chvc_tail;
265 * Map of PeerIdentities to 'struct ValidationEntry*'s (addresses
266 * of the given peer that we are currently validating, have validated
267 * or are blocked from re-validation for a while).
269 static struct GNUNET_CONTAINER_MultiHashMap *validation_map;
272 * Context for peerinfo iteration.
274 static struct GNUNET_PEERINFO_NotifyContext *pnc;
278 * Context for the validation entry match function.
280 struct ValidationEntryMatchContext
283 * Where to store the result?
285 struct ValidationEntry *ve;
288 * Transport name we're looking for.
290 const char *transport_name;
293 * Address we're interested in.
298 * Number of bytes in 'addr'.
305 * Iterate over validation entries until a matching one is found.
307 * @param cls the 'struct ValidationEntryMatchContext'
308 * @param key peer identity (unused)
309 * @param value a 'struct ValidationEntry' to match
310 * @return GNUNET_YES if the entry does not match,
311 * GNUNET_NO if the entry does match
314 validation_entry_match (void *cls, const GNUNET_HashCode * key, void *value)
316 struct ValidationEntryMatchContext *vemc = cls;
317 struct ValidationEntry *ve = value;
319 if ((ve->addrlen == vemc->addrlen) &&
320 (0 == memcmp (ve->addr, vemc->addr, ve->addrlen)) &&
321 (0 == strcmp (ve->transport_name, vemc->transport_name)))
331 * Find a ValidationEntry entry for the given neighbour that matches
332 * the given address and transport. If none exists, create one (but
333 * without starting any validation).
335 * @param public_key public key of the peer, NULL for unknown
336 * @param neighbour which peer we care about
337 * @param tname name of the transport plugin
338 * @param addr binary address
339 * @param addrlen length of addr
340 * @return validation entry matching the given specifications, NULL
341 * if we don't have an existing entry and no public key was given
343 static struct ValidationEntry *
344 find_validation_entry (const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
345 *public_key, const struct GNUNET_PeerIdentity *neighbour,
346 const char *tname, const char *addr, size_t addrlen)
348 struct ValidationEntryMatchContext vemc;
349 struct ValidationEntry *ve;
352 vemc.transport_name = tname;
354 vemc.addrlen = addrlen;
355 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
356 &neighbour->hashPubKey,
357 &validation_entry_match, &vemc);
358 if (NULL != (ve = vemc.ve))
360 if (public_key == NULL)
362 ve = GNUNET_malloc (sizeof (struct ValidationEntry) + addrlen);
363 ve->transport_name = GNUNET_strdup (tname);
364 ve->addr = (void *) &ve[1];
365 ve->public_key = *public_key;
366 ve->pid = *neighbour;
368 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
369 memcpy (&ve[1], addr, addrlen);
370 ve->addrlen = addrlen;
371 GNUNET_CONTAINER_multihashmap_put (validation_map, &neighbour->hashPubKey, ve,
372 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
378 * Iterator which adds the given address to the set of validated
381 * @param cls original HELLO message
382 * @param tname name of the transport
383 * @param expiration expiration time
384 * @param addr the address
385 * @param addrlen length of the address
386 * @return GNUNET_OK (keep the address)
389 add_valid_address (void *cls, const char *tname,
390 struct GNUNET_TIME_Absolute expiration, const void *addr,
393 const struct GNUNET_HELLO_Message *hello = cls;
394 struct ValidationEntry *ve;
395 struct GNUNET_PeerIdentity pid;
396 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
398 if (GNUNET_TIME_absolute_get_remaining (expiration).rel_value == 0)
399 return GNUNET_OK; /* expired */
400 if ((GNUNET_OK != GNUNET_HELLO_get_id (hello, &pid)) ||
401 (GNUNET_OK != GNUNET_HELLO_get_key (hello, &public_key)))
404 return GNUNET_OK; /* invalid HELLO !? */
406 ve = find_validation_entry (&public_key, &pid, tname, addr, addrlen);
407 ve->valid_until = GNUNET_TIME_absolute_max (ve->valid_until, expiration);
408 GNUNET_ATS_address_update (GST_ats, &pid, tname, addr,
409 addrlen, NULL, NULL, 0);
415 * Function called for any HELLO known to PEERINFO.
418 * @param peer id of the peer, NULL for last call
419 * @param hello hello message for the peer (can be NULL)
420 * @param err_msg error message
423 process_peerinfo_hello (void *cls, const struct GNUNET_PeerIdentity *peer,
424 const struct GNUNET_HELLO_Message *hello,
427 GNUNET_assert (NULL != peer);
430 GNUNET_assert (NULL ==
431 GNUNET_HELLO_iterate_addresses (hello, GNUNET_NO,
438 * Start the validation subsystem.
441 GST_validation_start ()
443 validation_map = GNUNET_CONTAINER_multihashmap_create (VALIDATION_MAP_SIZE);
444 pnc = GNUNET_PEERINFO_notify (GST_cfg, &process_peerinfo_hello, NULL);
449 * Iterate over validation entries and free them.
451 * @param cls (unused)
452 * @param key peer identity (unused)
453 * @param value a 'struct ValidationEntry' to clean up
454 * @return GNUNET_YES (continue to iterate)
457 cleanup_validation_entry (void *cls, const GNUNET_HashCode * key, void *value)
459 struct ValidationEntry *ve = value;
463 GST_blacklist_test_cancel (ve->bc);
466 GNUNET_break (GNUNET_OK ==
467 GNUNET_CONTAINER_multihashmap_remove (validation_map,
468 &ve->pid.hashPubKey, ve));
469 GNUNET_free (ve->transport_name);
470 if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
472 GNUNET_SCHEDULER_cancel (ve->timeout_task);
473 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
481 * Stop the validation subsystem.
484 GST_validation_stop ()
486 struct CheckHelloValidatedContext *chvc;
488 GNUNET_CONTAINER_multihashmap_iterate (validation_map,
489 &cleanup_validation_entry, NULL);
490 GNUNET_CONTAINER_multihashmap_destroy (validation_map);
491 validation_map = NULL;
492 while (NULL != (chvc = chvc_head))
494 GNUNET_CONTAINER_DLL_remove (chvc_head, chvc_tail, chvc);
497 GNUNET_PEERINFO_notify_cancel (pnc);
502 * Address validation cleanup task (record no longer needed).
504 * @param cls the 'struct ValidationEntry'
505 * @param tc scheduler context (unused)
508 timeout_hello_validation (void *cls,
509 const struct GNUNET_SCHEDULER_TaskContext *tc)
511 struct ValidationEntry *ve = cls;
513 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
514 GNUNET_STATISTICS_update (GST_stats,
515 gettext_noop ("# address records discarded"), 1,
517 cleanup_validation_entry (NULL, &ve->pid.hashPubKey, ve);
522 * Send the given PONG to the given address.
524 * @param cls the PONG message
525 * @param public_key public key for the peer, never NULL
526 * @param target peer this change is about, never NULL
527 * @param valid_until is ZERO if we never validated the address,
528 * otherwise a time up to when we consider it (or was) valid
529 * @param validation_block is FOREVER if the address is for an unsupported plugin (from PEERINFO)
530 * is ZERO if the address is considered valid (no validation needed)
531 * otherwise a time in the future if we're currently denying re-validation
532 * @param plugin_name name of the plugin
533 * @param plugin_address binary address
534 * @param plugin_address_len length of address
537 multicast_pong (void *cls,
538 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded
539 *public_key, const struct GNUNET_PeerIdentity *target,
540 struct GNUNET_TIME_Absolute valid_until,
541 struct GNUNET_TIME_Absolute validation_block,
542 const char *plugin_name, const void *plugin_address,
543 size_t plugin_address_len)
545 struct TransportPongMessage *pong = cls;
546 struct GNUNET_TRANSPORT_PluginFunctions *papi;
548 papi = GST_plugins_find (plugin_name);
551 (void) papi->send (papi->cls, target, (const char *) pong,
552 ntohs (pong->header.size), PONG_PRIORITY,
553 HELLO_REVALIDATION_START_TIME, NULL, plugin_address,
554 plugin_address_len, GNUNET_YES, NULL, NULL);
559 * We've received a PING. If appropriate, generate a PONG.
561 * @param sender peer sending the PING
562 * @param hdr the PING
563 * @param session session we got the PING from
564 * @param plugin_name name of plugin that received the PING
565 * @param sender_address address of the sender as known to the plugin, NULL
566 * if we did not initiate the connection
567 * @param sender_address_len number of bytes in sender_address
570 GST_validation_handle_ping (const struct GNUNET_PeerIdentity *sender,
571 const struct GNUNET_MessageHeader *hdr,
572 const char *plugin_name, struct Session *session,
573 const void *sender_address,
574 size_t sender_address_len)
576 const struct TransportPingMessage *ping;
577 struct TransportPongMessage *pong;
578 struct GNUNET_TRANSPORT_PluginFunctions *papi;
579 struct GNUNET_CRYPTO_RsaSignature *sig_cache;
580 struct GNUNET_TIME_Absolute *sig_cache_exp;
587 if (ntohs (hdr->size) < sizeof (struct TransportPingMessage))
592 ping = (const struct TransportPingMessage *) hdr;
594 memcmp (&ping->target, &GST_my_identity,
595 sizeof (struct GNUNET_PeerIdentity)))
600 GNUNET_STATISTICS_update (GST_stats,
601 gettext_noop ("# PING messages received"), 1,
603 addr = (const char *) &ping[1];
604 alen = ntohs (hdr->size) - sizeof (struct TransportPingMessage);
605 /* peer wants to confirm that this is one of our addresses, this is what is
606 * used for address validation */
608 addrend = memchr (addr, '\0', alen);
615 slen = strlen (addr) + 1;
619 GST_hello_test_address (addr, addrend, alen, &sig_cache, &sig_cache_exp))
621 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
623 ("Not confirming PING with address `%s' since I cannot confirm having this address.\n"),
624 GST_plugins_a2s (addr, addrend, alen));
628 pong = GNUNET_malloc (sizeof (struct TransportPongMessage) + alen + slen);
630 htons (sizeof (struct TransportPongMessage) + alen + slen);
631 pong->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PONG);
633 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
634 sizeof (uint32_t) + sizeof (struct GNUNET_TIME_AbsoluteNBO) +
636 pong->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN);
637 pong->challenge = ping->challenge;
638 pong->addrlen = htonl (alen + slen);
639 memcpy (&pong[1], addr, slen);
640 memcpy (&((char *) &pong[1])[slen], addrend, alen);
641 if (GNUNET_TIME_absolute_get_remaining (*sig_cache_exp).rel_value <
642 PONG_SIGNATURE_LIFETIME.rel_value / 4)
644 /* create / update cached sig */
646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
647 "Creating PONG signature to indicate ownership.\n");
649 *sig_cache_exp = GNUNET_TIME_relative_to_absolute (PONG_SIGNATURE_LIFETIME);
650 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
651 GNUNET_assert (GNUNET_OK ==
652 GNUNET_CRYPTO_rsa_sign (GST_my_private_key, &pong->purpose,
657 pong->expiration = GNUNET_TIME_absolute_hton (*sig_cache_exp);
659 pong->signature = *sig_cache;
661 /* first see if the session we got this PING from can be used to transmit
662 * a response reliably */
663 papi = GST_plugins_find (plugin_name);
668 papi->send (papi->cls, sender, (const char *) pong,
669 ntohs (pong->header.size), PONG_PRIORITY,
670 HELLO_REVALIDATION_START_TIME, session, sender_address,
671 sender_address_len, GNUNET_SYSERR, NULL, NULL);
674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
675 "Transmitted PONG to `%s' via reliable mechanism\n",
676 GNUNET_i2s (sender));
678 GNUNET_STATISTICS_update (GST_stats,
680 ("# PONGs unicast via reliable transport"), 1,
686 /* no reliable method found, try transmission via all known addresses */
687 GNUNET_STATISTICS_update (GST_stats,
689 ("# PONGs multicast to all available addresses"), 1,
691 GST_validation_get_addresses (sender, &multicast_pong, pong);
697 * Context for the 'validate_address' function
699 struct ValidateAddressContext
702 * Hash of the public key of the peer whose address is being validated.
704 struct GNUNET_PeerIdentity pid;
707 * Public key of the peer whose address is being validated.
709 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded public_key;
714 * Function called with the result from blacklisting.
715 * Send a PING to the other peer if a communication is allowed.
717 * @param cls ou r'struct ValidationEntry'
718 * @param pid identity of the other peer
719 * @param result GNUNET_OK if the connection is allowed, GNUNET_NO if not
722 transmit_ping_if_allowed (void *cls, const struct GNUNET_PeerIdentity *pid,
725 struct ValidationEntry *ve = cls;
726 struct TransportPingMessage ping;
727 struct GNUNET_TRANSPORT_PluginFunctions *papi;
728 const struct GNUNET_MessageHeader *hello;
735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting plain PING to `%s'\n",
738 slen = strlen (ve->transport_name) + 1;
739 hello = GST_hello_get ();
740 hsize = ntohs (hello->size);
741 tsize = sizeof (struct TransportPingMessage) + ve->addrlen + slen + hsize;
744 htons (sizeof (struct TransportPingMessage) + ve->addrlen + slen);
745 ping.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PING);
746 ping.challenge = htonl (ve->challenge);
749 if (tsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
751 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
753 ("Not transmitting `%s' with `%s', message too big (%u bytes!). This should not happen.\n"),
754 "HELLO", "PING", (unsigned int) tsize);
755 /* message too big (!?), get rid of HELLO */
757 tsize = sizeof (struct TransportPingMessage) + ve->addrlen + slen + hsize;
760 char message_buf[tsize];
762 /* build message with structure:
763 * [HELLO][TransportPingMessage][Transport name][Address] */
764 memcpy (message_buf, hello, hsize);
765 memcpy (&message_buf[hsize], &ping, sizeof (struct TransportPingMessage));
766 memcpy (&message_buf[sizeof (struct TransportPingMessage) + hsize],
767 ve->transport_name, slen);
768 memcpy (&message_buf[sizeof (struct TransportPingMessage) + slen + hsize],
769 ve->addr, ve->addrlen);
770 papi = GST_plugins_find (ve->transport_name);
775 GNUNET_assert (papi->send != NULL);
777 papi->send (papi->cls, pid, message_buf, tsize, PING_PRIORITY,
778 HELLO_REVALIDATION_START_TIME, NULL /* no session */ ,
779 ve->addr, ve->addrlen, GNUNET_YES, NULL, NULL);
784 ve->send_time = GNUNET_TIME_absolute_get ();
785 GNUNET_STATISTICS_update (GST_stats,
787 ("# PING without HELLO messages sent"), 1,
794 * Iterator callback to go over all addresses and try to validate them
795 * (unless blocked or already validated).
797 * @param cls pointer to a 'struct ValidateAddressContext'
798 * @param tname name of the transport
799 * @param expiration expiration time
800 * @param addr the address
801 * @param addrlen length of the address
802 * @return GNUNET_OK (keep the address)
805 validate_address (void *cls, const char *tname,
806 struct GNUNET_TIME_Absolute expiration, const void *addr,
809 const struct ValidateAddressContext *vac = cls;
810 const struct GNUNET_PeerIdentity *pid = &vac->pid;
811 struct ValidationEntry *ve;
812 struct GST_BlacklistCheck *bc;
814 if (GNUNET_TIME_absolute_get_remaining (expiration).rel_value == 0)
815 return GNUNET_OK; /* expired */
816 ve = find_validation_entry (&vac->public_key, pid, tname, addr, addrlen);
817 if (GNUNET_TIME_absolute_get_remaining (ve->validation_block).rel_value > 0)
818 return GNUNET_OK; /* blocked */
819 if ((GNUNET_SCHEDULER_NO_TASK != ve->timeout_task) &&
820 (GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value > 0))
821 return GNUNET_OK; /* revalidation task already scheduled & still valid */
822 ve->validation_block =
823 GNUNET_TIME_relative_to_absolute (HELLO_REVALIDATION_START_TIME);
824 if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
825 GNUNET_SCHEDULER_cancel (ve->timeout_task);
827 GNUNET_SCHEDULER_add_delayed (HELLO_REVALIDATION_START_TIME,
828 &timeout_hello_validation, ve);
829 bc = GST_blacklist_test_allowed (pid, tname, &transmit_ping_if_allowed, ve);
837 * Do address validation again to keep address valid.
839 * @param cls the 'struct ValidationEntry'
840 * @param tc scheduler context (unused)
843 revalidate_address (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
845 struct ValidationEntry *ve = cls;
846 struct GNUNET_TIME_Relative delay;
847 struct ValidateAddressContext vac;
849 ve->timeout_task = GNUNET_SCHEDULER_NO_TASK;
850 delay = GNUNET_TIME_absolute_get_remaining (ve->validation_block);
851 if (delay.rel_value > 0)
853 /* should wait a bit longer */
855 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
858 GNUNET_STATISTICS_update (GST_stats,
859 gettext_noop ("# address revalidations started"), 1,
862 vac.public_key = ve->public_key;
863 validate_address (&vac, ve->transport_name, ve->valid_until, ve->addr,
864 (uint16_t) ve->addrlen);
869 * Add the validated peer address to the HELLO.
871 * @param cls the 'struct ValidationEntry' with the validated address
872 * @param max space in buf
873 * @param buf where to add the address
874 * @return number of bytes written, 0 to signal the
875 * end of the iteration.
878 add_valid_peer_address (void *cls, size_t max, void *buf)
880 struct ValidationEntry *ve = cls;
882 if (GNUNET_YES == ve->copied)
883 return 0; /* terminate */
884 ve->copied = GNUNET_YES;
885 return GNUNET_HELLO_add_address (ve->transport_name, ve->valid_until,
886 ve->addr, ve->addrlen, buf, max);
891 * We've received a PONG. Check if it matches a pending PING and
892 * mark the respective address as confirmed.
894 * @param sender peer sending the PONG
895 * @param hdr the PONG
898 GST_validation_handle_pong (const struct GNUNET_PeerIdentity *sender,
899 const struct GNUNET_MessageHeader *hdr)
901 const struct TransportPongMessage *pong;
902 struct ValidationEntry *ve;
909 struct GNUNET_TIME_Relative delay;
910 struct GNUNET_HELLO_Message *hello;
912 if (ntohs (hdr->size) < sizeof (struct TransportPongMessage))
917 GNUNET_STATISTICS_update (GST_stats,
918 gettext_noop ("# PONG messages received"), 1,
921 pong = (const struct TransportPongMessage *) hdr;
922 tname = (const char *) &pong[1];
923 size = ntohs (hdr->size) - sizeof (struct TransportPongMessage);
924 addr = memchr (tname, '\0', size);
931 slen = strlen (tname) + 1;
932 addrlen = size - slen;
934 ve = find_validation_entry (NULL, sender, tname, addr, addrlen);
938 GNUNET_STATISTICS_update (GST_stats,
940 ("# PONGs dropped, no matching pending validation"),
944 /* now check that PONG is well-formed */
945 if (0 != memcmp (&ve->pid, sender, sizeof (struct GNUNET_PeerIdentity)))
951 if (GNUNET_TIME_absolute_get_remaining
952 (GNUNET_TIME_absolute_ntoh (pong->expiration)).rel_value == 0)
954 GNUNET_STATISTICS_update (GST_stats,
956 ("# PONGs dropped, signature expired"), 1,
961 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_TRANSPORT_PONG_OWN,
962 &pong->purpose, &pong->signature,
969 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
970 "Address validated for peer `%s' with plugin `%s': `%s'\n",
971 GNUNET_i2s (sender), tname, GST_plugins_a2s (tname, addr,
975 /* validity achieved, remember it! */
976 ve->valid_until = GNUNET_TIME_relative_to_absolute (HELLO_ADDRESS_EXPIRATION);
978 struct GNUNET_TRANSPORT_ATS_Information ats;
980 ats.type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY);
981 ats.value = htonl ((uint32_t) GNUNET_TIME_absolute_get_duration (ve->send_time).rel_value);
982 GNUNET_ATS_address_update (GST_ats, &ve->pid,
983 ve->transport_name,ve->addr, ve->addrlen, NULL,
987 /* build HELLO to store in PEERINFO */
988 ve->copied = GNUNET_NO;
989 hello = GNUNET_HELLO_create (&ve->public_key, &add_valid_peer_address, ve);
990 GNUNET_PEERINFO_add_peer (GST_peerinfo, hello);
993 if (GNUNET_SCHEDULER_NO_TASK != ve->timeout_task)
994 GNUNET_SCHEDULER_cancel (ve->timeout_task);
996 /* randomly delay by up to 1h to avoid synchronous validations */
997 rdelay = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 60 * 60);
999 GNUNET_TIME_relative_add (HELLO_REVALIDATION_START_TIME,
1000 GNUNET_TIME_relative_multiply
1001 (GNUNET_TIME_UNIT_SECONDS, rdelay));
1003 GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
1008 * We've received a HELLO, check which addresses are new and trigger
1011 * @param hello the HELLO we received
1014 GST_validation_handle_hello (const struct GNUNET_MessageHeader *hello)
1016 const struct GNUNET_HELLO_Message *hm =
1017 (const struct GNUNET_HELLO_Message *) hello;
1018 struct ValidateAddressContext vac;
1019 struct GNUNET_HELLO_Message *h;
1021 if ((GNUNET_OK != GNUNET_HELLO_get_id (hm, &vac.pid)) ||
1022 (GNUNET_OK != GNUNET_HELLO_get_key (hm, &vac.public_key)))
1024 /* malformed HELLO */
1028 /* Add peer identity without addresses to peerinfo service */
1029 h = GNUNET_HELLO_create (&vac.public_key, NULL, NULL);
1030 GNUNET_PEERINFO_add_peer (GST_peerinfo, h);
1031 #if VERBOSE_VALIDATION
1032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1034 ("Adding `%s' without addresses for peer `%s'\n"),
1036 GNUNET_i2s(&vac.pid));
1040 GNUNET_assert (NULL ==
1041 GNUNET_HELLO_iterate_addresses (hm, GNUNET_NO,
1042 &validate_address, &vac));
1047 * Closure for 'iterate_addresses'
1049 struct IteratorContext
1052 * Function to call on each address.
1054 GST_ValidationAddressCallback cb;
1065 * Call the callback in the closure for each validation entry.
1067 * @param cls the 'struct GST_ValidationIteratorContext'
1068 * @param key the peer's identity
1069 * @param value the 'struct ValidationEntry'
1070 * @return GNUNET_OK (continue to iterate)
1073 iterate_addresses (void *cls, const GNUNET_HashCode * key, void *value)
1075 struct IteratorContext *ic = cls;
1076 struct ValidationEntry *ve = value;
1078 ic->cb (ic->cb_cls, &ve->public_key, &ve->pid, ve->valid_until,
1079 ve->validation_block, ve->transport_name, ve->addr, ve->addrlen);
1085 * Call the given function for each address for the given target.
1086 * Can either give a snapshot (synchronous API) or be continuous.
1088 * @param target peer information is requested for
1089 * @param cb function to call; will not be called after this function returns
1090 * @param cb_cls closure for 'cb'
1093 GST_validation_get_addresses (const struct GNUNET_PeerIdentity *target,
1094 GST_ValidationAddressCallback cb, void *cb_cls)
1096 struct IteratorContext ic;
1100 GNUNET_CONTAINER_multihashmap_get_multiple (validation_map,
1101 &target->hashPubKey,
1102 &iterate_addresses, &ic);
1106 /* end of file gnunet-service-transport_validation.c */