2 This file is part of GNUnet.
3 (C) 2009 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 2, or (at your
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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.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file core/gnunet-service-core.c
23 * @brief high-level P2P messaging
24 * @author Christian Grothoff
26 * Considerations for later:
27 * - check that hostkey used by transport (for HELLOs) is the
28 * same as the hostkey that we are using!
29 * - add code to send PINGs if we are about to time-out otherwise
30 * - optimize lookup (many O(n) list traversals
31 * could ideally be changed to O(1) hash map lookups)
34 #include "gnunet_constants.h"
35 #include "gnunet_util_lib.h"
36 #include "gnunet_hello_lib.h"
37 #include "gnunet_peerinfo_service.h"
38 #include "gnunet_protocols.h"
39 #include "gnunet_signatures.h"
40 #include "gnunet_statistics_service.h"
41 #include "gnunet_transport_service.h"
45 #define DEBUG_HANDSHAKE GNUNET_YES
47 #define DEBUG_CORE_QUOTA GNUNET_YES
50 * Receive and send buffer windows grow over time. For
51 * how long can 'unused' bandwidth accumulate before we
52 * need to cap it? (specified in seconds).
54 #define MAX_WINDOW_TIME_S (5 * 60)
57 * How many messages do we queue up at most for optional
58 * notifications to a client? (this can cause notifications
59 * about outgoing messages to be dropped).
61 #define MAX_NOTIFY_QUEUE 16
64 * Minimum bandwidth (out) to assign to any connected peer.
65 * Should be rather low; values larger than DEFAULT_BW_IN_OUT make no
68 #define MIN_BANDWIDTH_PER_PEER GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT
71 * After how much time past the "official" expiration time do
72 * we discard messages? Should not be zero since we may
73 * intentionally defer transmission until close to the deadline
74 * and then may be slightly past the deadline due to inaccuracy
75 * in sleep and our own CPU consumption.
77 #define PAST_EXPIRATION_DISCARD_TIME GNUNET_TIME_UNIT_SECONDS
80 * What is the maximum delay for a SET_KEY message?
82 #define MAX_SET_KEY_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
85 * What how long do we wait for SET_KEY confirmation initially?
87 #define INITIAL_SET_KEY_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 3)
90 * What is the maximum delay for a PING message?
92 #define MAX_PING_DELAY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 2)
95 * What is the maximum delay for a PONG message?
97 #define MAX_PONG_DELAY GNUNET_TIME_relative_multiply (MAX_PING_DELAY, 2)
100 * What is the minimum frequency for a PING message?
102 #define MIN_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
105 * How often do we recalculate bandwidth quotas?
107 #define QUOTA_UPDATE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
110 * What is the priority for a SET_KEY message?
112 #define SET_KEY_PRIORITY 0xFFFFFF
115 * What is the priority for a PING message?
117 #define PING_PRIORITY 0xFFFFFF
120 * What is the priority for a PONG message?
122 #define PONG_PRIORITY 0xFFFFFF
125 * How many messages do we queue per peer at most? Must be at
128 #define MAX_PEER_QUEUE_SIZE 16
131 * How many non-mandatory messages do we queue per client at most?
133 #define MAX_CLIENT_QUEUE_SIZE 32
136 * What is the maximum age of a message for us to consider
137 * processing it? Note that this looks at the timestamp used
138 * by the other peer, so clock skew between machines does
139 * come into play here. So this should be picked high enough
140 * so that a little bit of clock skew does not prevent peers
141 * from connecting to us.
143 #define MAX_MESSAGE_AGE GNUNET_TIME_UNIT_DAYS
146 * What is the maximum size for encrypted messages? Note that this
147 * number imposes a clear limit on the maximum size of any message.
148 * Set to a value close to 64k but not so close that transports will
149 * have trouble with their headers.
151 #define MAX_ENCRYPTED_MESSAGE_SIZE (63 * 1024)
155 * State machine for our P2P encryption handshake. Everyone starts in
156 * "DOWN", if we receive the other peer's key (other peer initiated)
157 * we start in state RECEIVED (since we will immediately send our
158 * own); otherwise we start in SENT. If we get back a PONG from
159 * within either state, we move up to CONFIRMED (the PONG will always
160 * be sent back encrypted with the key we sent to the other peer).
162 enum PeerStateMachine
166 PEER_STATE_KEY_RECEIVED,
167 PEER_STATE_KEY_CONFIRMED
172 * Number of bytes (at the beginning) of "struct EncryptedMessage"
173 * that are NOT encrypted.
175 #define ENCRYPTED_HEADER_SIZE (sizeof(struct GNUNET_MessageHeader) + sizeof(uint32_t))
179 * Encapsulation for encrypted messages exchanged between
180 * peers. Followed by the actual encrypted data.
182 struct EncryptedMessage
185 * Message type is either CORE_ENCRYPTED_MESSAGE.
187 struct GNUNET_MessageHeader header;
190 * Random value used for IV generation. ENCRYPTED_HEADER_SIZE must
191 * be set to the offset of the *next* field.
193 uint32_t iv_seed GNUNET_PACKED;
196 * Hash of the plaintext (starting at 'sequence_number'), used to
197 * verify message integrity. Everything after this hash (including
198 * this hash itself) will be encrypted.
200 GNUNET_HashCode plaintext_hash;
203 * Sequence number, in network byte order. This field
204 * must be the first encrypted/decrypted field and the
205 * first byte that is hashed for the plaintext hash.
207 uint32_t sequence_number GNUNET_PACKED;
210 * Desired bandwidth (how much we should send to this peer / how
211 * much is the sender willing to receive)?
213 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
216 * Timestamp. Used to prevent reply of ancient messages
217 * (recent messages are caught with the sequence number).
219 struct GNUNET_TIME_AbsoluteNBO timestamp;
225 * We're sending an (encrypted) PING to the other peer to check if he
226 * can decrypt. The other peer should respond with a PONG with the
227 * same content, except this time encrypted with the receiver's key.
232 * Message type is CORE_PING.
234 struct GNUNET_MessageHeader header;
237 * Random number chosen to make reply harder.
239 uint32_t challenge GNUNET_PACKED;
242 * Intended target of the PING, used primarily to check
243 * that decryption actually worked.
245 struct GNUNET_PeerIdentity target;
251 * Response to a PING. Includes data from the original PING
252 * plus initial bandwidth quota information.
257 * Message type is CORE_PONG.
259 struct GNUNET_MessageHeader header;
262 * Random number proochosen to make reply harder. Must be
263 * first field after header (this is where we start to encrypt!).
265 uint32_t challenge GNUNET_PACKED;
270 uint32_t reserved GNUNET_PACKED;
273 * Desired bandwidth (how much we should send to this
274 * peer / how much is the sender willing to receive).
276 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
279 * Intended target of the PING, used primarily to check
280 * that decryption actually worked.
282 struct GNUNET_PeerIdentity target;
287 * Message transmitted to set (or update) a session key.
293 * Message type is either CORE_SET_KEY.
295 struct GNUNET_MessageHeader header;
298 * Status of the sender (should be in "enum PeerStateMachine"), nbo.
300 int32_t sender_status GNUNET_PACKED;
303 * Purpose of the signature, will be
304 * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
306 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
309 * At what time was this key created?
311 struct GNUNET_TIME_AbsoluteNBO creation_time;
314 * The encrypted session key.
316 struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
319 * Who is the intended recipient?
321 struct GNUNET_PeerIdentity target;
324 * Signature of the stuff above (starting at purpose).
326 struct GNUNET_CRYPTO_RsaSignature signature;
332 * Message waiting for transmission. This struct
333 * is followed by the actual content of the message.
339 * We keep messages in a doubly linked list.
341 struct MessageEntry *next;
344 * We keep messages in a doubly linked list.
346 struct MessageEntry *prev;
349 * By when are we supposed to transmit this message?
351 struct GNUNET_TIME_Absolute deadline;
354 * By when are we supposed to transmit this message (after
357 struct GNUNET_TIME_Absolute slack_deadline;
360 * How important is this message to us?
362 unsigned int priority;
365 * How long is the message? (number of bytes following
366 * the "struct MessageEntry", but not including the
367 * size of "struct MessageEntry" itself!)
372 * Was this message selected for transmission in the
373 * current round? GNUNET_YES or GNUNET_NO.
378 * Did we give this message some slack (delayed sending) previously
379 * (and hence should not give it any more slack)? GNUNET_YES or
390 * We keep neighbours in a linked list (for now).
392 struct Neighbour *next;
395 * Unencrypted messages destined for this peer.
397 struct MessageEntry *messages;
400 * Head of the batched, encrypted message queue (already ordered,
401 * transmit starting with the head).
403 struct MessageEntry *encrypted_head;
406 * Tail of the batched, encrypted message queue (already ordered,
407 * append new messages to tail)
409 struct MessageEntry *encrypted_tail;
412 * Handle for pending requests for transmission to this peer
413 * with the transport service. NULL if no request is pending.
415 struct GNUNET_TRANSPORT_TransmitHandle *th;
418 * Public key of the neighbour, NULL if we don't have it yet.
420 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
423 * We received a PING message before we got the "public_key"
424 * (or the SET_KEY). We keep it here until we have a key
425 * to decrypt it. NULL if no PING is pending.
427 struct PingMessage *pending_ping;
430 * We received a PONG message before we got the "public_key"
431 * (or the SET_KEY). We keep it here until we have a key
432 * to decrypt it. NULL if no PONG is pending.
434 struct PongMessage *pending_pong;
437 * Non-NULL if we are currently looking up HELLOs for this peer.
440 struct GNUNET_PEERINFO_IteratorContext *pitr;
443 * SetKeyMessage to transmit, NULL if we are not currently trying
446 struct SetKeyMessage *skm;
449 * Identity of the neighbour.
451 struct GNUNET_PeerIdentity peer;
454 * Key we use to encrypt our messages for the other peer
455 * (initialized by us when we do the handshake).
457 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
460 * Key we use to decrypt messages from the other peer
461 * (given to us by the other peer during the handshake).
463 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
466 * ID of task used for re-trying plaintext scheduling.
468 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
471 * ID of task used for re-trying SET_KEY and PING message.
473 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
476 * ID of task used for updating bandwidth quota for this neighbour.
478 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
481 * ID of task used for sending keep-alive pings.
483 GNUNET_SCHEDULER_TaskIdentifier keep_alive_task;
486 * ID of task used for cleaning up dead neighbour entries.
488 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
491 * At what time did we generate our encryption key?
493 struct GNUNET_TIME_Absolute encrypt_key_created;
496 * At what time did the other peer generate the decryption key?
498 struct GNUNET_TIME_Absolute decrypt_key_created;
501 * At what time did we initially establish (as in, complete session
502 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
504 struct GNUNET_TIME_Absolute time_established;
507 * At what time did we last receive an encrypted message from the
508 * other peer? Should be zero if status != KEY_CONFIRMED.
510 struct GNUNET_TIME_Absolute last_activity;
513 * Last latency observed from this peer.
515 struct GNUNET_TIME_Relative last_latency;
518 * At what frequency are we currently re-trying SET_KEY messages?
520 struct GNUNET_TIME_Relative set_key_retry_frequency;
523 * Tracking bandwidth for sending to this peer.
525 struct GNUNET_BANDWIDTH_Tracker available_send_window;
528 * Tracking bandwidth for receiving from this peer.
530 struct GNUNET_BANDWIDTH_Tracker available_recv_window;
533 * How valueable were the messages of this peer recently?
535 unsigned long long current_preference;
538 * Bit map indicating which of the 32 sequence numbers before the last
539 * were received (good for accepting out-of-order packets and
540 * estimating reliability of the connection)
542 unsigned int last_packets_bitmap;
545 * last sequence number received on this connection (highest)
547 uint32_t last_sequence_number_received;
550 * last sequence number transmitted
552 uint32_t last_sequence_number_sent;
555 * Available bandwidth in for this peer (current target).
557 struct GNUNET_BANDWIDTH_Value32NBO bw_in;
560 * Available bandwidth out for this peer (current target).
562 struct GNUNET_BANDWIDTH_Value32NBO bw_out;
565 * Internal bandwidth limit set for this peer (initially typically
566 * set to "-1"). Actual "bw_out" is MIN of
567 * "bpm_out_internal_limit" and "bw_out_external_limit".
569 struct GNUNET_BANDWIDTH_Value32NBO bw_out_internal_limit;
572 * External bandwidth limit set for this peer by the
573 * peer that we are communicating with. "bw_out" is MIN of
574 * "bw_out_internal_limit" and "bw_out_external_limit".
576 struct GNUNET_BANDWIDTH_Value32NBO bw_out_external_limit;
579 * What was our PING challenge number (for this peer)?
581 uint32_t ping_challenge;
584 * What was the last distance to this peer as reported by the transports?
586 uint32_t last_distance;
589 * What is our connection status?
591 enum PeerStateMachine status;
594 * Are we currently connected to this neighbour?
602 * Data structure for each client connected to the core service.
607 * Clients are kept in a linked list.
612 * Handle for the client with the server API.
614 struct GNUNET_SERVER_Client *client_handle;
617 * Array of the types of messages this peer cares
618 * about (with "tcnt" entries). Allocated as part
619 * of this client struct, do not free!
621 const uint16_t *types;
624 * Options for messages this client cares about,
625 * see GNUNET_CORE_OPTION_ values.
630 * Number of types of incoming messages this client
631 * specifically cares about. Size of the "types" array.
641 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
646 static struct GNUNET_PeerIdentity my_identity;
651 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
656 struct GNUNET_SCHEDULER_Handle *sched;
661 const struct GNUNET_CONFIGURATION_Handle *cfg;
666 static struct GNUNET_SERVER_Handle *server;
671 static struct GNUNET_TRANSPORT_Handle *transport;
674 * Linked list of our clients.
676 static struct Client *clients;
679 * Context for notifications we need to send to our clients.
681 static struct GNUNET_SERVER_NotificationContext *notifier;
684 * We keep neighbours in a linked list (for now).
686 static struct Neighbour *neighbours;
689 * For creating statistics.
691 static struct GNUNET_STATISTICS_Handle *stats;
694 * Sum of all preferences among all neighbours.
696 static unsigned long long preference_sum;
699 * Total number of neighbours we have.
701 static unsigned int neighbour_count;
704 * How much inbound bandwidth are we supposed to be using per second?
705 * FIXME: this value is not used!
707 static unsigned long long bandwidth_target_in_bps;
710 * How much outbound bandwidth are we supposed to be using per second?
712 static unsigned long long bandwidth_target_out_bps;
717 * A preference value for a neighbour was update. Update
718 * the preference sum accordingly.
720 * @param inc how much was a preference value increased?
723 update_preference_sum (unsigned long long inc)
726 unsigned long long os;
729 preference_sum += inc;
730 if (preference_sum >= os)
732 /* overflow! compensate by cutting all values in half! */
737 n->current_preference /= 2;
738 preference_sum += n->current_preference;
741 GNUNET_STATISTICS_set (stats, gettext_noop ("# total peer preference"), preference_sum, GNUNET_NO);
746 * Find the entry for the given neighbour.
748 * @param peer identity of the neighbour
749 * @return NULL if we are not connected, otherwise the
752 static struct Neighbour *
753 find_neighbour (const struct GNUNET_PeerIdentity *peer)
755 struct Neighbour *ret;
758 while ((ret != NULL) &&
759 (0 != memcmp (&ret->peer,
760 peer, sizeof (struct GNUNET_PeerIdentity))))
767 * Send a message to one of our clients.
769 * @param client target for the message
770 * @param msg message to transmit
771 * @param can_drop could this message be dropped if the
772 * client's queue is getting too large?
775 send_to_client (struct Client *client,
776 const struct GNUNET_MessageHeader *msg,
779 #if DEBUG_CORE_CLIENT
780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
781 "Preparing to send message of type %u to client.\n",
782 (unsigned int) ntohs (msg->type));
784 GNUNET_SERVER_notification_context_unicast (notifier,
785 client->client_handle,
792 * Send a message to all of our current clients that have
793 * the right options set.
795 * @param msg message to multicast
796 * @param can_drop can this message be discarded if the queue is too long
797 * @param options mask to use
800 send_to_all_clients (const struct GNUNET_MessageHeader *msg,
809 if (0 != (c->options & options))
811 #if DEBUG_CORE_CLIENT
812 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
813 "Sending message of type %u to client.\n",
814 (unsigned int) ntohs (msg->type));
816 send_to_client (c, msg, can_drop);
824 * Handle CORE_INIT request.
827 handle_client_init (void *cls,
828 struct GNUNET_SERVER_Client *client,
829 const struct GNUNET_MessageHeader *message)
831 const struct InitMessage *im;
832 struct InitReplyMessage irm;
835 const uint16_t *types;
838 struct ConnectNotifyMessage cnm;
841 #if DEBUG_CORE_CLIENT
842 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
843 "Client connecting to core service with `%s' message\n",
846 /* check that we don't have an entry already */
850 if (client == c->client_handle)
853 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
858 msize = ntohs (message->size);
859 if (msize < sizeof (struct InitMessage))
862 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
865 GNUNET_SERVER_notification_context_add (notifier, client);
866 im = (const struct InitMessage *) message;
867 types = (const uint16_t *) &im[1];
868 msize -= sizeof (struct InitMessage);
869 c = GNUNET_malloc (sizeof (struct Client) + msize);
870 c->client_handle = client;
873 c->tcnt = msize / sizeof (uint16_t);
874 c->types = (const uint16_t *) &c[1];
875 wtypes = (uint16_t *) &c[1];
876 for (i=0;i<c->tcnt;i++)
877 wtypes[i] = ntohs (types[i]);
878 c->options = ntohl (im->options);
879 #if DEBUG_CORE_CLIENT
880 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
881 "Client %p is interested in %u message types\n",
883 (unsigned int) c->tcnt);
885 /* send init reply message */
886 irm.header.size = htons (sizeof (struct InitReplyMessage));
887 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
888 irm.reserved = htonl (0);
889 memcpy (&irm.publicKey,
891 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
892 #if DEBUG_CORE_CLIENT
893 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
894 "Sending `%s' message to client.\n", "INIT_REPLY");
896 send_to_client (c, &irm.header, GNUNET_NO);
897 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
899 /* notify new client about existing neighbours */
900 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
901 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
905 if (n->status == PEER_STATE_KEY_CONFIRMED)
907 #if DEBUG_CORE_CLIENT
908 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
909 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
911 cnm.distance = htonl (n->last_distance);
912 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
914 send_to_client (c, &cnm.header, GNUNET_NO);
919 GNUNET_SERVER_receive_done (client, GNUNET_OK);
924 * A client disconnected, clean up.
927 * @param client identification of the client
930 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
937 #if DEBUG_CORE_CLIENT
938 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
939 "Client %p has disconnected from core service.\n",
946 if (client == pos->client_handle)
951 prev->next = pos->next;
958 /* client never sent INIT */
963 * Handle REQUEST_INFO request.
966 handle_client_request_info (void *cls,
967 struct GNUNET_SERVER_Client *client,
968 const struct GNUNET_MessageHeader *message)
970 const struct RequestInfoMessage *rcm;
972 struct ConfigurationInfoMessage cim;
975 unsigned long long old_preference;
976 struct GNUNET_SERVER_TransmitContext *tc;
978 #if DEBUG_CORE_CLIENT
979 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
980 "Core service receives `%s' request.\n", "REQUEST_INFO");
982 rcm = (const struct RequestInfoMessage *) message;
983 n = find_neighbour (&rcm->peer);
984 memset (&cim, 0, sizeof (cim));
987 want_reserv = ntohl (rcm->reserve_inbound);
988 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
990 n->bw_out_internal_limit = rcm->limit_outbound;
991 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
992 n->bw_out_external_limit);
993 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
995 GNUNET_TRANSPORT_set_quota (transport,
999 GNUNET_TIME_UNIT_FOREVER_REL,
1002 if (want_reserv < 0)
1004 got_reserv = want_reserv;
1006 else if (want_reserv > 0)
1008 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1009 want_reserv).value == 0)
1010 got_reserv = want_reserv;
1012 got_reserv = 0; /* all or nothing */
1016 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1018 old_preference = n->current_preference;
1019 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1020 if (old_preference > n->current_preference)
1022 /* overflow; cap at maximum value */
1023 n->current_preference = (unsigned long long) -1;
1025 update_preference_sum (n->current_preference - old_preference);
1026 #if DEBUG_CORE_QUOTA
1027 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1028 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1030 GNUNET_i2s (&rcm->peer),
1033 cim.reserved_amount = htonl (got_reserv);
1034 cim.bw_in = n->bw_in;
1035 cim.bw_out = n->bw_out;
1036 cim.preference = n->current_preference;
1038 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1039 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1040 cim.peer = rcm->peer;
1042 #if DEBUG_CORE_CLIENT
1043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1044 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1046 tc = GNUNET_SERVER_transmit_context_create (client);
1047 GNUNET_SERVER_transmit_context_append_message (tc, &cim.header);
1048 GNUNET_SERVER_transmit_context_run (tc,
1049 GNUNET_TIME_UNIT_FOREVER_REL);
1054 * Free the given entry for the neighbour (it has
1055 * already been removed from the list at this point).
1057 * @param n neighbour to free
1060 free_neighbour (struct Neighbour *n)
1062 struct MessageEntry *m;
1064 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1065 "Destroying neighbour entry for peer `%4s'\n",
1066 GNUNET_i2s (&n->peer));
1067 if (n->pitr != NULL)
1069 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1074 GNUNET_free (n->skm);
1077 while (NULL != (m = n->messages))
1079 n->messages = m->next;
1082 while (NULL != (m = n->encrypted_head))
1084 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1091 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1094 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1095 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1096 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1097 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
1098 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1099 GNUNET_SCHEDULER_cancel (sched, n->quota_update_task);
1100 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1101 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1102 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1103 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
1104 if (n->status == PEER_STATE_KEY_CONFIRMED)
1105 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), -1, GNUNET_NO);
1106 GNUNET_free_non_null (n->public_key);
1107 GNUNET_free_non_null (n->pending_ping);
1108 GNUNET_free_non_null (n->pending_pong);
1114 * Check if we have encrypted messages for the specified neighbour
1115 * pending, and if so, check with the transport about sending them
1118 * @param n neighbour to check.
1120 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1124 * Encrypt size bytes from in and write the result to out. Use the
1125 * key for outbound traffic of the given neighbour.
1127 * @param n neighbour we are sending to
1128 * @param iv initialization vector to use
1129 * @param in ciphertext
1130 * @param out plaintext
1131 * @param size size of in/out
1132 * @return GNUNET_OK on success
1135 do_encrypt (struct Neighbour *n,
1136 const GNUNET_HashCode * iv,
1137 const void *in, void *out, size_t size)
1139 if (size != (uint16_t) size)
1144 GNUNET_assert (size ==
1145 GNUNET_CRYPTO_aes_encrypt (in,
1149 GNUNET_CRYPTO_AesInitializationVector
1151 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1153 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1154 "Encrypted %u bytes for `%4s' using key %u\n",
1155 (unsigned int) size,
1156 GNUNET_i2s (&n->peer),
1157 (unsigned int) n->encrypt_key.crc32);
1164 * Consider freeing the given neighbour since we may not need
1165 * to keep it around anymore.
1167 * @param n neighbour to consider discarding
1170 consider_free_neighbour (struct Neighbour *n);
1174 * Task triggered when a neighbour entry is about to time out
1175 * (and we should prevent this by sending a PING).
1177 * @param cls the 'struct Neighbour'
1178 * @param tc scheduler context (not used)
1181 send_keep_alive (void *cls,
1182 const struct GNUNET_SCHEDULER_TaskContext *tc)
1184 struct Neighbour *n = cls;
1185 struct GNUNET_TIME_Relative retry;
1186 struct GNUNET_TIME_Relative left;
1187 struct MessageEntry *me;
1188 struct PingMessage pp;
1189 struct PingMessage *pm;
1191 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1193 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1194 sizeof (struct PingMessage));
1195 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1196 me->priority = PING_PRIORITY;
1197 me->size = sizeof (struct PingMessage);
1198 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1202 pm = (struct PingMessage *) &me[1];
1203 pm->header.size = htons (sizeof (struct PingMessage));
1204 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1205 pp.challenge = htonl (n->ping_challenge);
1206 pp.target = n->peer;
1208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1209 "Encrypting `%s' message with challenge %u for `%4s' using key %u.\n",
1211 (unsigned int) n->ping_challenge,
1212 GNUNET_i2s (&n->peer),
1213 (unsigned int) n->encrypt_key.crc32);
1216 &n->peer.hashPubKey,
1219 sizeof (struct PingMessage) -
1220 sizeof (struct GNUNET_MessageHeader));
1221 process_encrypted_neighbour_queue (n);
1222 /* reschedule PING job */
1223 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1224 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1225 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1226 MIN_PING_FREQUENCY);
1228 = GNUNET_SCHEDULER_add_delayed (sched,
1237 * Task triggered when a neighbour entry might have gotten stale.
1239 * @param cls the 'struct Neighbour'
1240 * @param tc scheduler context (not used)
1243 consider_free_task (void *cls,
1244 const struct GNUNET_SCHEDULER_TaskContext *tc)
1246 struct Neighbour *n = cls;
1248 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1249 consider_free_neighbour (n);
1254 * Consider freeing the given neighbour since we may not need
1255 * to keep it around anymore.
1257 * @param n neighbour to consider discarding
1260 consider_free_neighbour (struct Neighbour *n)
1262 struct Neighbour *pos;
1263 struct Neighbour *prev;
1264 struct GNUNET_TIME_Relative left;
1266 if ( (n->th != NULL) ||
1267 (n->pitr != NULL) ||
1268 (n->status == PEER_STATE_KEY_CONFIRMED) ||
1269 (GNUNET_YES == n->is_connected) )
1270 return; /* no chance */
1272 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1273 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1276 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1277 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1278 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
1280 &consider_free_task,
1284 /* actually free the neighbour... */
1293 neighbours = n->next;
1295 prev->next = n->next;
1296 GNUNET_assert (neighbour_count > 0);
1298 GNUNET_STATISTICS_set (stats,
1299 gettext_noop ("# neighbour entries allocated"),
1307 * Function called when the transport service is ready to
1308 * receive an encrypted message for the respective peer
1310 * @param cls neighbour to use message from
1311 * @param size number of bytes we can transmit
1312 * @param buf where to copy the message
1313 * @return number of bytes transmitted
1316 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1318 struct Neighbour *n = cls;
1319 struct MessageEntry *m;
1324 m = n->encrypted_head;
1328 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1329 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1330 GNUNET_i2s (&n->peer));
1334 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1341 GNUNET_assert (size >= m->size);
1342 memcpy (cbuf, &m[1], m->size);
1344 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1347 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1348 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1349 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1351 GNUNET_i2s (&n->peer));
1353 process_encrypted_neighbour_queue (n);
1358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1359 "Transmission of message of type %u and size %u failed\n",
1360 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1361 (unsigned int) m->size);
1365 consider_free_neighbour (n);
1371 * Check if we have plaintext messages for the specified neighbour
1372 * pending, and if so, consider batching and encrypting them (and
1373 * then trigger processing of the encrypted queue if needed).
1375 * @param n neighbour to check.
1377 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1381 * Check if we have encrypted messages for the specified neighbour
1382 * pending, and if so, check with the transport about sending them
1385 * @param n neighbour to check.
1388 process_encrypted_neighbour_queue (struct Neighbour *n)
1390 struct MessageEntry *m;
1393 return; /* request already pending */
1394 m = n->encrypted_head;
1397 /* encrypted queue empty, try plaintext instead */
1398 process_plaintext_neighbour_queue (n);
1402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1403 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1404 (unsigned int) m->size,
1405 GNUNET_i2s (&n->peer),
1406 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).
1410 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1413 GNUNET_TIME_absolute_get_remaining
1415 ¬ify_encrypted_transmit_ready,
1419 /* message request too large or duplicate request */
1421 /* discard encrypted message */
1422 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1426 process_encrypted_neighbour_queue (n);
1432 * Decrypt size bytes from in and write the result to out. Use the
1433 * key for inbound traffic of the given neighbour. This function does
1434 * NOT do any integrity-checks on the result.
1436 * @param n neighbour we are receiving from
1437 * @param iv initialization vector to use
1438 * @param in ciphertext
1439 * @param out plaintext
1440 * @param size size of in/out
1441 * @return GNUNET_OK on success
1444 do_decrypt (struct Neighbour *n,
1445 const GNUNET_HashCode * iv,
1446 const void *in, void *out, size_t size)
1448 if (size != (uint16_t) size)
1453 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1454 (n->status != PEER_STATE_KEY_CONFIRMED))
1456 GNUNET_break_op (0);
1457 return GNUNET_SYSERR;
1460 GNUNET_CRYPTO_aes_decrypt (in,
1464 GNUNET_CRYPTO_AesInitializationVector *) iv,
1468 return GNUNET_SYSERR;
1470 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes decrypted"), size, GNUNET_NO);
1472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1473 "Decrypted %u bytes from `%4s' using key %u\n",
1474 (unsigned int) size,
1475 GNUNET_i2s (&n->peer),
1476 (unsigned int) n->decrypt_key.crc32);
1483 * Select messages for transmission. This heuristic uses a combination
1484 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1485 * and priority-based discard (in case no feasible schedule exist) and
1486 * speculative optimization (defer any kind of transmission until
1487 * we either create a batch of significant size, 25% of max, or until
1488 * we are close to a deadline). Furthermore, when scheduling the
1489 * heuristic also packs as many messages into the batch as possible,
1490 * starting with those with the earliest deadline. Yes, this is fun.
1492 * @param n neighbour to select messages from
1493 * @param size number of bytes to select for transmission
1494 * @param retry_time set to the time when we should try again
1495 * (only valid if this function returns zero)
1496 * @return number of bytes selected, or 0 if we decided to
1497 * defer scheduling overall; in that case, retry_time is set.
1500 select_messages (struct Neighbour *n,
1501 size_t size, struct GNUNET_TIME_Relative *retry_time)
1503 struct MessageEntry *pos;
1504 struct MessageEntry *min;
1505 struct MessageEntry *last;
1506 unsigned int min_prio;
1507 struct GNUNET_TIME_Absolute t;
1508 struct GNUNET_TIME_Absolute now;
1509 struct GNUNET_TIME_Relative delta;
1511 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
1514 unsigned int queue_size;
1515 int discard_low_prio;
1517 GNUNET_assert (NULL != n->messages);
1518 now = GNUNET_TIME_absolute_get ();
1519 /* last entry in linked list of messages processed */
1521 /* should we remove the entry with the lowest
1522 priority from consideration for scheduling at the
1533 discard_low_prio = GNUNET_YES;
1534 while (GNUNET_YES == discard_low_prio)
1538 discard_low_prio = GNUNET_NO;
1539 /* calculate number of bytes available for transmission at time "t" */
1540 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
1542 /* how many bytes have we (hypothetically) scheduled so far */
1544 /* maximum time we can wait before transmitting anything
1545 and still make all of our deadlines */
1546 slack = GNUNET_CONSTANTS_MAX_CORK_DELAY;
1548 /* note that we use "*2" here because we want to look
1549 a bit further into the future; much more makes no
1550 sense since new message might be scheduled in the
1552 while ((pos != NULL) && (off < size * 2))
1554 if (pos->do_transmit == GNUNET_YES)
1556 /* already removed from consideration */
1560 if (discard_low_prio == GNUNET_NO)
1562 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
1563 if (delta.value > 0)
1565 // FIXME: HUH? Check!
1567 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
1570 if (avail < pos->size)
1572 // FIXME: HUH? Check!
1573 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1578 /* update slack, considering both its absolute deadline
1579 and relative deadlines caused by other messages
1580 with their respective load */
1581 slack = GNUNET_TIME_relative_min (slack,
1582 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
1584 if (pos->deadline.value <= now.value)
1587 slack = GNUNET_TIME_UNIT_ZERO;
1589 else if (GNUNET_YES == pos->got_slack)
1591 /* should be soon now! */
1592 slack = GNUNET_TIME_relative_min (slack,
1593 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
1598 GNUNET_TIME_relative_min (slack,
1599 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
1600 pos->got_slack = GNUNET_YES;
1601 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
1602 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
1607 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
1608 if (pos->priority <= min_prio)
1610 /* update min for discard */
1611 min_prio = pos->priority;
1616 if (discard_low_prio)
1618 GNUNET_assert (min != NULL);
1619 /* remove lowest-priority entry from consideration */
1620 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1624 /* guard against sending "tiny" messages with large headers without
1626 if ( (slack.value > 0) &&
1628 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
1630 /* less than 25% of message would be filled with deadlines still
1631 being met if we delay by one second or more; so just wait for
1632 more data; but do not wait longer than 1s (since we don't want
1633 to delay messages for a really long time either). */
1634 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
1635 /* reset do_transmit values for next time */
1638 pos->do_transmit = GNUNET_NO;
1642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1643 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
1644 (unsigned long long) slack.value,
1646 (unsigned int) size);
1650 /* select marked messages (up to size) for transmission */
1655 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
1657 pos->do_transmit = GNUNET_YES; /* mark for transmission */
1662 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
1666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1667 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
1668 (unsigned long long) off, (unsigned long long) tsize,
1669 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
1670 GNUNET_i2s (&n->peer));
1677 * Batch multiple messages into a larger buffer.
1679 * @param n neighbour to take messages from
1680 * @param buf target buffer
1681 * @param size size of buf
1682 * @param deadline set to transmission deadline for the result
1683 * @param retry_time set to the time when we should try again
1684 * (only valid if this function returns zero)
1685 * @param priority set to the priority of the batch
1686 * @return number of bytes written to buf (can be zero)
1689 batch_message (struct Neighbour *n,
1692 struct GNUNET_TIME_Absolute *deadline,
1693 struct GNUNET_TIME_Relative *retry_time,
1694 unsigned int *priority)
1696 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE];
1697 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
1698 struct MessageEntry *pos;
1699 struct MessageEntry *prev;
1700 struct MessageEntry *next;
1705 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1706 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
1707 if (0 == select_messages (n, size, retry_time))
1710 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1711 "No messages selected, will try again in %llu ms\n",
1716 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
1717 ntm->distance = htonl (n->last_distance);
1718 ntm->latency = GNUNET_TIME_relative_hton (n->last_latency);
1719 ntm->peer = n->peer;
1723 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
1726 if (GNUNET_YES == pos->do_transmit)
1728 GNUNET_assert (pos->size <= size);
1729 /* do notifications */
1730 /* FIXME: track if we have *any* client that wants
1731 full notifications and only do this if that is
1733 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
1735 memcpy (&ntm[1], &pos[1], pos->size);
1736 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1737 sizeof (struct GNUNET_MessageHeader));
1738 send_to_all_clients (&ntm->header,
1740 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
1744 /* message too large for 'full' notifications, we do at
1745 least the 'hdr' type */
1748 sizeof (struct GNUNET_MessageHeader));
1750 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1752 send_to_all_clients (&ntm->header,
1754 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
1756 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1757 "Encrypting message of type %u\n",
1758 (unsigned int) ntohs(((struct GNUNET_MessageHeader*)&pos[1])->type));
1760 /* copy for encrypted transmission */
1761 memcpy (&buf[ret], &pos[1], pos->size);
1764 *priority += pos->priority;
1766 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1767 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
1768 (unsigned int) pos->size,
1769 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).value);
1771 deadline->value = GNUNET_MIN (deadline->value, pos->deadline.value);
1785 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1786 "Deadline for message batch is %llu ms\n",
1787 GNUNET_TIME_absolute_get_remaining (*deadline).value);
1794 * Remove messages with deadlines that have long expired from
1797 * @param n neighbour to inspect
1800 discard_expired_messages (struct Neighbour *n)
1802 struct MessageEntry *prev;
1803 struct MessageEntry *next;
1804 struct MessageEntry *pos;
1805 struct GNUNET_TIME_Absolute now;
1806 struct GNUNET_TIME_Relative delta;
1808 now = GNUNET_TIME_absolute_get ();
1814 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
1815 if (delta.value > PAST_EXPIRATION_DISCARD_TIME.value)
1818 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1819 "Message is %llu ms past due, discarding.\n",
1836 * Signature of the main function of a task.
1838 * @param cls closure
1839 * @param tc context information (why was this task triggered now)
1842 retry_plaintext_processing (void *cls,
1843 const struct GNUNET_SCHEDULER_TaskContext *tc)
1845 struct Neighbour *n = cls;
1847 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1848 process_plaintext_neighbour_queue (n);
1853 * Send our key (and encrypted PING) to the other peer.
1855 * @param n the other peer
1857 static void send_key (struct Neighbour *n);
1860 * Task that will retry "send_key" if our previous attempt failed
1864 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1866 struct Neighbour *n = cls;
1869 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1870 "Retrying key transmission to `%4s'\n",
1871 GNUNET_i2s (&n->peer));
1873 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
1874 n->set_key_retry_frequency =
1875 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
1881 * Check if we have plaintext messages for the specified neighbour
1882 * pending, and if so, consider batching and encrypting them (and
1883 * then trigger processing of the encrypted queue if needed).
1885 * @param n neighbour to check.
1888 process_plaintext_neighbour_queue (struct Neighbour *n)
1890 char pbuf[MAX_ENCRYPTED_MESSAGE_SIZE]; /* plaintext */
1893 struct EncryptedMessage *em; /* encrypted message */
1894 struct EncryptedMessage *ph; /* plaintext header */
1895 struct MessageEntry *me;
1896 unsigned int priority;
1897 struct GNUNET_TIME_Absolute deadline;
1898 struct GNUNET_TIME_Relative retry_time;
1901 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1903 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1904 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1908 case PEER_STATE_DOWN:
1911 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1912 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1913 GNUNET_i2s(&n->peer));
1916 case PEER_STATE_KEY_SENT:
1917 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1918 n->retry_set_key_task
1919 = GNUNET_SCHEDULER_add_delayed (sched,
1920 n->set_key_retry_frequency,
1921 &set_key_retry_task, n);
1923 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1924 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1925 GNUNET_i2s(&n->peer));
1928 case PEER_STATE_KEY_RECEIVED:
1929 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1930 n->retry_set_key_task
1931 = GNUNET_SCHEDULER_add_delayed (sched,
1932 n->set_key_retry_frequency,
1933 &set_key_retry_task, n);
1935 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1936 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1937 GNUNET_i2s(&n->peer));
1940 case PEER_STATE_KEY_CONFIRMED:
1941 /* ready to continue */
1944 discard_expired_messages (n);
1945 if (n->messages == NULL)
1948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1949 "Plaintext message queue for `%4s' is empty.\n",
1950 GNUNET_i2s(&n->peer));
1952 return; /* no pending messages */
1954 if (n->encrypted_head != NULL)
1957 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1958 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
1959 GNUNET_i2s(&n->peer));
1961 return; /* wait for messages already encrypted to be
1964 ph = (struct EncryptedMessage *) pbuf;
1965 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1967 used = sizeof (struct EncryptedMessage);
1968 used += batch_message (n,
1970 MAX_ENCRYPTED_MESSAGE_SIZE - used,
1971 &deadline, &retry_time, &priority);
1972 if (used == sizeof (struct EncryptedMessage))
1975 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1976 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
1977 GNUNET_i2s(&n->peer));
1979 /* no messages selected for sending, try again later... */
1980 n->retry_plaintext_task =
1981 GNUNET_SCHEDULER_add_delayed (sched,
1983 &retry_plaintext_processing, n);
1986 #if DEBUG_CORE_QUOTA
1987 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1988 "Sending %u b/s as new limit to peer `%4s'\n",
1989 (unsigned int) ntohl (n->bw_in.value__),
1990 GNUNET_i2s (&n->peer));
1992 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, -1));
1993 ph->sequence_number = htonl (++n->last_sequence_number_sent);
1994 ph->inbound_bw_limit = n->bw_in;
1995 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1997 /* setup encryption message header */
1998 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
1999 me->deadline = deadline;
2000 me->priority = priority;
2002 em = (struct EncryptedMessage *) &me[1];
2003 em->header.size = htons (used);
2004 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2005 em->iv_seed = ph->iv_seed;
2006 esize = used - ENCRYPTED_HEADER_SIZE;
2007 GNUNET_CRYPTO_hash (&ph->sequence_number,
2008 esize - sizeof (GNUNET_HashCode),
2009 &ph->plaintext_hash);
2010 GNUNET_CRYPTO_hash (&ph->iv_seed, sizeof (uint32_t), &iv);
2012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2013 "Hashed %u bytes of plaintext (`%s') using IV `%d'\n",
2014 (unsigned int) (esize - sizeof (GNUNET_HashCode)),
2015 GNUNET_h2s (&ph->plaintext_hash),
2020 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2021 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2022 (unsigned int) esize,
2023 GNUNET_i2s(&n->peer),
2024 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).value);
2026 GNUNET_assert (GNUNET_OK ==
2029 &ph->plaintext_hash,
2030 &em->plaintext_hash, esize));
2031 /* append to transmission list */
2032 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2036 process_encrypted_neighbour_queue (n);
2041 * Function that recalculates the bandwidth quota for the
2042 * given neighbour and transmits it to the transport service.
2044 * @param cls neighbour for the quota update
2048 neighbour_quota_update (void *cls,
2049 const struct GNUNET_SCHEDULER_TaskContext *tc);
2053 * Schedule the task that will recalculate the bandwidth
2054 * quota for this peer (and possibly force a disconnect of
2055 * idle peers by calculating a bandwidth of zero).
2058 schedule_quota_update (struct Neighbour *n)
2060 GNUNET_assert (n->quota_update_task ==
2061 GNUNET_SCHEDULER_NO_TASK);
2062 n->quota_update_task
2063 = GNUNET_SCHEDULER_add_delayed (sched,
2064 QUOTA_UPDATE_FREQUENCY,
2065 &neighbour_quota_update,
2071 * Initialize a new 'struct Neighbour'.
2073 * @param pid ID of the new neighbour
2074 * @return handle for the new neighbour
2076 static struct Neighbour *
2077 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2079 struct Neighbour *n;
2080 struct GNUNET_TIME_Absolute now;
2082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2083 "Creating neighbour entry for peer `%4s'\n",
2085 n = GNUNET_malloc (sizeof (struct Neighbour));
2086 n->next = neighbours;
2089 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
2091 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2092 now = GNUNET_TIME_absolute_get ();
2093 n->encrypt_key_created = now;
2094 n->last_activity = now;
2095 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2096 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2097 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2098 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init ((uint32_t) - 1);
2099 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2100 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2102 neighbour_quota_update (n, NULL);
2103 consider_free_neighbour (n);
2109 * Handle CORE_SEND request.
2112 * @param client the client issuing the request
2113 * @param message the "struct SendMessage"
2116 handle_client_send (void *cls,
2117 struct GNUNET_SERVER_Client *client,
2118 const struct GNUNET_MessageHeader *message)
2120 const struct SendMessage *sm;
2121 struct Neighbour *n;
2122 struct MessageEntry *prev;
2123 struct MessageEntry *pos;
2124 struct MessageEntry *e;
2125 struct MessageEntry *min_prio_entry;
2126 struct MessageEntry *min_prio_prev;
2127 unsigned int min_prio;
2128 unsigned int queue_size;
2131 msize = ntohs (message->size);
2133 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2137 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2140 sm = (const struct SendMessage *) message;
2141 msize -= sizeof (struct SendMessage);
2142 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2144 /* FIXME: should we not allow loopback-injection here? */
2147 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2150 n = find_neighbour (&sm->peer);
2152 n = create_neighbour (&sm->peer);
2154 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2155 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2157 (unsigned int) msize,
2158 GNUNET_i2s (&sm->peer));
2160 /* bound queue size */
2161 discard_expired_messages (n);
2162 min_prio = (unsigned int) -1;
2163 min_prio_entry = NULL;
2164 min_prio_prev = NULL;
2170 if (pos->priority < min_prio)
2172 min_prio_entry = pos;
2173 min_prio_prev = prev;
2174 min_prio = pos->priority;
2180 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2183 if (ntohl(sm->priority) <= min_prio)
2185 /* discard new entry */
2187 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2188 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2190 (unsigned int) MAX_PEER_QUEUE_SIZE,
2191 (unsigned int) msize,
2192 (unsigned int) ntohs (message->type));
2195 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2198 /* discard "min_prio_entry" */
2200 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2201 "Queue full, discarding existing older request\n");
2203 if (min_prio_prev == NULL)
2204 n->messages = min_prio_entry->next;
2206 min_prio_prev->next = min_prio_entry->next;
2207 GNUNET_free (min_prio_entry);
2211 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2212 "Adding transmission request for `%4s' of size %u to queue\n",
2213 GNUNET_i2s (&sm->peer),
2214 (unsigned int) msize);
2216 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2217 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2218 e->priority = ntohl (sm->priority);
2220 memcpy (&e[1], &sm[1], msize);
2222 /* insert, keep list sorted by deadline */
2225 while ((pos != NULL) && (pos->deadline.value < e->deadline.value))
2236 /* consider scheduling now */
2237 process_plaintext_neighbour_queue (n);
2239 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2244 * Function called when the transport service is ready to
2245 * receive a message. Only resets 'n->th' to NULL.
2247 * @param cls neighbour to use message from
2248 * @param size number of bytes we can transmit
2249 * @param buf where to copy the message
2250 * @return number of bytes transmitted
2253 notify_transport_connect_done (void *cls, size_t size, void *buf)
2255 struct Neighbour *n = cls;
2260 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2261 _("Failed to connect to `%4s': transport failed to connect\n"),
2262 GNUNET_i2s (&n->peer));
2271 * Handle CORE_REQUEST_CONNECT request.
2274 * @param client the client issuing the request
2275 * @param message the "struct ConnectMessage"
2278 handle_client_request_connect (void *cls,
2279 struct GNUNET_SERVER_Client *client,
2280 const struct GNUNET_MessageHeader *message)
2282 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2283 struct Neighbour *n;
2284 struct GNUNET_TIME_Relative timeout;
2286 if (0 == memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2289 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2292 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2293 n = find_neighbour (&cm->peer);
2295 n = create_neighbour (&cm->peer);
2296 if ( (GNUNET_YES == n->is_connected) ||
2298 return; /* already connected, or at least trying */
2299 GNUNET_STATISTICS_update (stats, gettext_noop ("# connection requests received"), 1, GNUNET_NO);
2301 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2302 "Core received `%s' request for `%4s', will try to establish connection\n",
2304 GNUNET_i2s (&cm->peer));
2306 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2307 /* ask transport to connect to the peer */
2308 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2310 sizeof (struct GNUNET_MessageHeader), 0,
2312 ¬ify_transport_connect_done,
2314 GNUNET_break (NULL != n->th);
2319 * List of handlers for the messages understood by this
2322 static struct GNUNET_SERVER_MessageHandler handlers[] = {
2323 {&handle_client_init, NULL,
2324 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
2325 {&handle_client_request_info, NULL,
2326 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
2327 sizeof (struct RequestInfoMessage)},
2328 {&handle_client_send, NULL,
2329 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
2330 {&handle_client_request_connect, NULL,
2331 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
2332 sizeof (struct ConnectMessage)},
2338 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2339 * the neighbour's struct and retry send_key. Or, if we did not get a
2340 * HELLO, just do nothing.
2342 * @param cls the 'struct Neighbour' to retry sending the key for
2343 * @param peer the peer for which this is the HELLO
2344 * @param hello HELLO message of that peer
2345 * @param trust amount of trust we currently have in that peer
2348 process_hello_retry_send_key (void *cls,
2349 const struct GNUNET_PeerIdentity *peer,
2350 const struct GNUNET_HELLO_Message *hello,
2353 struct Neighbour *n = cls;
2358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2359 "Entered `%s' and `%s' is NULL!\n",
2360 "process_hello_retry_send_key",
2364 if (n->public_key != NULL)
2366 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2368 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2369 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2371 GNUNET_STATISTICS_update (stats,
2372 gettext_noop ("# SETKEY messages deferred (need public key)"),
2379 GNUNET_STATISTICS_update (stats,
2380 gettext_noop ("# Delayed connecting due to lack of public key"),
2383 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2384 n->retry_set_key_task
2385 = GNUNET_SCHEDULER_add_delayed (sched,
2386 n->set_key_retry_frequency,
2387 &set_key_retry_task, n);
2393 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2394 "Entered `%s' for peer `%4s'\n",
2395 "process_hello_retry_send_key",
2398 if (n->public_key != NULL)
2400 /* already have public key, why are we here? */
2406 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2407 "Received new `%s' message for `%4s', initiating key exchange.\n",
2412 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2413 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2415 GNUNET_STATISTICS_update (stats,
2416 gettext_noop ("# Error extracting public key from HELLO"),
2419 GNUNET_free (n->public_key);
2420 n->public_key = NULL;
2422 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2423 "GNUNET_HELLO_get_key returned awfully\n");
2431 * Send our key (and encrypted PING) to the other peer.
2433 * @param n the other peer
2436 send_key (struct Neighbour *n)
2438 struct SetKeyMessage *sm;
2439 struct MessageEntry *me;
2440 struct PingMessage pp;
2441 struct PingMessage *pm;
2443 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2445 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2446 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2448 if (n->pitr != NULL)
2451 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2452 "Key exchange in progress with `%4s'.\n",
2453 GNUNET_i2s (&n->peer));
2455 return; /* already in progress */
2457 if (GNUNET_YES != n->is_connected)
2460 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2461 "Not yet connected to peer `%4s'!\n",
2462 GNUNET_i2s (&n->peer));
2466 GNUNET_STATISTICS_update (stats,
2467 gettext_noop ("# Asking transport to connect (for SETKEY)"),
2470 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2472 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
2474 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2475 ¬ify_encrypted_transmit_ready,
2481 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2482 "Asked to perform key exchange with `%4s'.\n",
2483 GNUNET_i2s (&n->peer));
2485 if (n->public_key == NULL)
2487 /* lookup n's public key, then try again */
2489 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2490 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2491 GNUNET_i2s (&n->peer));
2493 GNUNET_assert (n->pitr == NULL);
2494 n->pitr = GNUNET_PEERINFO_iterate (cfg,
2498 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2499 &process_hello_retry_send_key, n);
2502 /* first, set key message */
2503 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2504 sizeof (struct SetKeyMessage));
2505 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
2506 me->priority = SET_KEY_PRIORITY;
2507 me->size = sizeof (struct SetKeyMessage);
2508 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2512 sm = (struct SetKeyMessage *) &me[1];
2513 sm->header.size = htons (sizeof (struct SetKeyMessage));
2514 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
2515 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
2516 PEER_STATE_KEY_SENT : n->status));
2518 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2519 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2520 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2521 sizeof (struct GNUNET_PeerIdentity));
2522 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
2523 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
2524 sm->target = n->peer;
2525 GNUNET_assert (GNUNET_OK ==
2526 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
2528 GNUNET_CRYPTO_AesSessionKey),
2530 &sm->encrypted_key));
2531 GNUNET_assert (GNUNET_OK ==
2532 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
2535 /* second, encrypted PING message */
2536 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2537 sizeof (struct PingMessage));
2538 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
2539 me->priority = PING_PRIORITY;
2540 me->size = sizeof (struct PingMessage);
2541 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2545 pm = (struct PingMessage *) &me[1];
2546 pm->header.size = htons (sizeof (struct PingMessage));
2547 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
2548 pp.challenge = htonl (n->ping_challenge);
2549 pp.target = n->peer;
2551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2552 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u.\n",
2554 (unsigned int) n->ping_challenge,
2555 GNUNET_i2s (&n->peer),
2556 (unsigned int) n->encrypt_key.crc32);
2559 &n->peer.hashPubKey,
2562 sizeof (struct PingMessage) -
2563 sizeof (struct GNUNET_MessageHeader));
2567 case PEER_STATE_DOWN:
2568 n->status = PEER_STATE_KEY_SENT;
2570 case PEER_STATE_KEY_SENT:
2572 case PEER_STATE_KEY_RECEIVED:
2574 case PEER_STATE_KEY_CONFIRMED:
2580 GNUNET_STATISTICS_update (stats,
2581 gettext_noop ("# SETKEY and PING messages created"),
2585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2586 "Have %llu ms left for `%s' transmission.\n",
2587 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).value,
2590 /* trigger queue processing */
2591 process_encrypted_neighbour_queue (n);
2592 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
2593 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
2594 n->retry_set_key_task
2595 = GNUNET_SCHEDULER_add_delayed (sched,
2596 n->set_key_retry_frequency,
2597 &set_key_retry_task, n);
2602 * We received a SET_KEY message. Validate and update
2603 * our key material and status.
2605 * @param n the neighbour from which we received message m
2606 * @param m the set key message we received
2609 handle_set_key (struct Neighbour *n,
2610 const struct SetKeyMessage *m);
2614 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2615 * the neighbour's struct and retry handling the set_key message. Or,
2616 * if we did not get a HELLO, just free the set key message.
2618 * @param cls pointer to the set key message
2619 * @param peer the peer for which this is the HELLO
2620 * @param hello HELLO message of that peer
2621 * @param trust amount of trust we currently have in that peer
2624 process_hello_retry_handle_set_key (void *cls,
2625 const struct GNUNET_PeerIdentity *peer,
2626 const struct GNUNET_HELLO_Message *hello,
2629 struct Neighbour *n = cls;
2630 struct SetKeyMessage *sm = n->skm;
2636 if (n->public_key != NULL)
2639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2640 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
2642 GNUNET_i2s (&n->peer),
2645 handle_set_key (n, sm);
2650 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2651 "Ignoring `%s' message due to lack of public key for peer (failed to obtain one).\n",
2658 if (n->public_key != NULL)
2659 return; /* multiple HELLOs match!? */
2661 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2662 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2664 GNUNET_break_op (0);
2665 GNUNET_free (n->public_key);
2666 n->public_key = NULL;
2672 * We received a PING message. Validate and transmit
2675 * @param n sender of the PING
2676 * @param m the encrypted PING message itself
2679 handle_ping (struct Neighbour *n, const struct PingMessage *m)
2681 struct PingMessage t;
2682 struct PongMessage tx;
2683 struct PongMessage *tp;
2684 struct MessageEntry *me;
2687 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2688 "Core service receives `%s' request from `%4s'.\n",
2689 "PING", GNUNET_i2s (&n->peer));
2693 &my_identity.hashPubKey,
2696 sizeof (struct PingMessage) -
2697 sizeof (struct GNUNET_MessageHeader)))
2700 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2701 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u\n",
2703 GNUNET_i2s (&t.target),
2704 (unsigned int) ntohl (t.challenge),
2705 (unsigned int) n->decrypt_key.crc32);
2707 GNUNET_STATISTICS_update (stats,
2708 gettext_noop ("# PING messages decrypted"),
2711 if (0 != memcmp (&t.target,
2712 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2714 GNUNET_break_op (0);
2717 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2718 sizeof (struct PongMessage));
2719 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2723 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
2724 me->priority = PONG_PRIORITY;
2725 me->size = sizeof (struct PongMessage);
2726 tx.reserved = htonl (0);
2727 tx.inbound_bw_limit = n->bw_in;
2728 tx.challenge = t.challenge;
2729 tx.target = t.target;
2730 tp = (struct PongMessage *) &me[1];
2731 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
2732 tp->header.size = htons (sizeof (struct PongMessage));
2734 &my_identity.hashPubKey,
2737 sizeof (struct PongMessage) -
2738 sizeof (struct GNUNET_MessageHeader));
2739 GNUNET_STATISTICS_update (stats,
2740 gettext_noop ("# PONG messages created"),
2744 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2745 "Encrypting `%s' with challenge %u using key %u\n",
2747 (unsigned int) ntohl (t.challenge),
2748 (unsigned int) n->encrypt_key.crc32);
2750 /* trigger queue processing */
2751 process_encrypted_neighbour_queue (n);
2756 * We received a PONG message. Validate and update our status.
2758 * @param n sender of the PONG
2759 * @param m the encrypted PONG message itself
2762 handle_pong (struct Neighbour *n,
2763 const struct PongMessage *m)
2765 struct PongMessage t;
2766 struct ConnectNotifyMessage cnm;
2769 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2770 "Core service receives `%s' request from `%4s'.\n",
2771 "PONG", GNUNET_i2s (&n->peer));
2775 &n->peer.hashPubKey,
2778 sizeof (struct PongMessage) -
2779 sizeof (struct GNUNET_MessageHeader)))
2781 GNUNET_break_op (0);
2784 GNUNET_STATISTICS_update (stats,
2785 gettext_noop ("# PONG messages decrypted"),
2788 if (0 != ntohl (t.reserved))
2790 GNUNET_break_op (0);
2794 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2795 "Decrypted `%s' from `%4s' with challenge %u using key %u\n",
2797 GNUNET_i2s (&t.target),
2798 (unsigned int) ntohl (t.challenge),
2799 (unsigned int) n->decrypt_key.crc32);
2801 if ((0 != memcmp (&t.target,
2803 sizeof (struct GNUNET_PeerIdentity))) ||
2804 (n->ping_challenge != ntohl (t.challenge)))
2806 /* PONG malformed */
2808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2809 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
2811 GNUNET_i2s (&n->peer),
2812 (unsigned int) n->ping_challenge);
2813 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2814 "Received malformed `%s' received from `%4s' with challenge %u\n",
2815 "PONG", GNUNET_i2s (&t.target),
2816 (unsigned int) ntohl (t.challenge));
2818 GNUNET_break_op (0);
2823 case PEER_STATE_DOWN:
2824 GNUNET_break (0); /* should be impossible */
2826 case PEER_STATE_KEY_SENT:
2827 GNUNET_break (0); /* should be impossible, how did we decrypt? */
2829 case PEER_STATE_KEY_RECEIVED:
2830 GNUNET_STATISTICS_update (stats,
2831 gettext_noop ("# Session keys confirmed via PONG"),
2834 n->status = PEER_STATE_KEY_CONFIRMED;
2835 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
2837 n->bw_out_external_limit = t.inbound_bw_limit;
2838 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
2839 n->bw_out_internal_limit);
2840 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
2842 GNUNET_TRANSPORT_set_quota (transport,
2846 GNUNET_TIME_UNIT_FOREVER_REL,
2850 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2851 "Confirmed key via `%s' message for peer `%4s'\n",
2852 "PONG", GNUNET_i2s (&n->peer));
2854 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2856 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2857 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2859 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
2860 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
2861 cnm.distance = htonl (n->last_distance);
2862 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
2864 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
2865 process_encrypted_neighbour_queue (n);
2867 case PEER_STATE_KEY_CONFIRMED:
2868 n->last_activity = GNUNET_TIME_absolute_get ();
2869 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
2870 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
2872 = GNUNET_SCHEDULER_add_delayed (sched,
2873 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
2885 * We received a SET_KEY message. Validate and update
2886 * our key material and status.
2888 * @param n the neighbour from which we received message m
2889 * @param m the set key message we received
2892 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
2894 struct SetKeyMessage *m_cpy;
2895 struct GNUNET_TIME_Absolute t;
2896 struct GNUNET_CRYPTO_AesSessionKey k;
2897 struct PingMessage *ping;
2898 struct PongMessage *pong;
2899 enum PeerStateMachine sender_status;
2902 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2903 "Core service receives `%s' request from `%4s'.\n",
2904 "SET_KEY", GNUNET_i2s (&n->peer));
2906 if (n->public_key == NULL)
2908 if (n->pitr != NULL)
2911 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2912 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
2918 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2919 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
2921 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
2922 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
2923 /* lookup n's public key, then try again */
2924 GNUNET_assert (n->skm == NULL);
2926 n->pitr = GNUNET_PEERINFO_iterate (cfg,
2930 GNUNET_TIME_UNIT_MINUTES,
2931 &process_hello_retry_handle_set_key, n);
2932 GNUNET_STATISTICS_update (stats,
2933 gettext_noop ("# SETKEY messages deferred (need public key)"),
2938 if (0 != memcmp (&m->target,
2940 sizeof (struct GNUNET_PeerIdentity)))
2942 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2943 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
2945 GNUNET_i2s (&m->target));
2948 if ((ntohl (m->purpose.size) !=
2949 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2950 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2951 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2952 sizeof (struct GNUNET_PeerIdentity)) ||
2954 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
2955 &m->purpose, &m->signature, n->public_key)))
2957 /* invalid signature */
2958 GNUNET_break_op (0);
2961 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
2962 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
2963 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
2964 (t.value < n->decrypt_key_created.value))
2966 /* this could rarely happen due to massive re-ordering of
2967 messages on the network level, but is most likely either
2968 a bug or some adversary messing with us. Report. */
2969 GNUNET_break_op (0);
2973 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2974 "Decrypting key material.\n");
2976 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
2979 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
2980 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
2981 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
2983 /* failed to decrypt !? */
2984 GNUNET_break_op (0);
2987 GNUNET_STATISTICS_update (stats,
2988 gettext_noop ("# SETKEY messages decrypted"),
2992 if (n->decrypt_key_created.value != t.value)
2994 /* fresh key, reset sequence numbers */
2995 n->last_sequence_number_received = 0;
2996 n->last_packets_bitmap = 0;
2997 n->decrypt_key_created = t;
2999 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3002 case PEER_STATE_DOWN:
3003 n->status = PEER_STATE_KEY_RECEIVED;
3005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3006 "Responding to `%s' with my own key.\n", "SET_KEY");
3010 case PEER_STATE_KEY_SENT:
3011 case PEER_STATE_KEY_RECEIVED:
3012 n->status = PEER_STATE_KEY_RECEIVED;
3013 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3014 (sender_status != PEER_STATE_KEY_CONFIRMED))
3017 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3018 "Responding to `%s' with my own key (other peer has status %u).\n",
3020 (unsigned int) sender_status);
3025 case PEER_STATE_KEY_CONFIRMED:
3026 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3027 (sender_status != PEER_STATE_KEY_CONFIRMED))
3030 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3031 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3033 (unsigned int) sender_status);
3042 if (n->pending_ping != NULL)
3044 ping = n->pending_ping;
3045 n->pending_ping = NULL;
3046 handle_ping (n, ping);
3049 if (n->pending_pong != NULL)
3051 pong = n->pending_pong;
3052 n->pending_pong = NULL;
3053 handle_pong (n, pong);
3060 * Send a P2P message to a client.
3062 * @param sender who sent us the message?
3063 * @param client who should we give the message to?
3064 * @param m contains the message to transmit
3065 * @param msize number of bytes in buf to transmit
3068 send_p2p_message_to_client (struct Neighbour *sender,
3069 struct Client *client,
3070 const void *m, size_t msize)
3072 char buf[msize + sizeof (struct NotifyTrafficMessage)];
3073 struct NotifyTrafficMessage *ntm;
3076 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3077 "Core service passes message from `%4s' of type %u to client.\n",
3078 GNUNET_i2s(&sender->peer),
3079 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3081 ntm = (struct NotifyTrafficMessage *) buf;
3082 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
3083 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3084 ntm->distance = htonl (sender->last_distance);
3085 ntm->latency = GNUNET_TIME_relative_hton (sender->last_latency);
3086 ntm->peer = sender->peer;
3087 memcpy (&ntm[1], m, msize);
3088 send_to_client (client, &ntm->header, GNUNET_YES);
3093 * Deliver P2P message to interested clients.
3095 * @param sender who sent us the message?
3096 * @param m the message
3097 * @param msize size of the message (including header)
3100 deliver_message (struct Neighbour *sender,
3101 const struct GNUNET_MessageHeader *m, size_t msize)
3104 struct Client *cpos;
3110 type = ntohs (m->type);
3112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3113 "Received encapsulated message of type %u from `%4s'\n",
3114 (unsigned int) type,
3115 GNUNET_i2s (&sender->peer));
3117 GNUNET_snprintf (buf,
3119 gettext_noop ("# bytes of messages of type %u received"),
3120 (unsigned int) type);
3121 GNUNET_STATISTICS_set (stats,
3125 dropped = GNUNET_YES;
3127 while (cpos != NULL)
3129 deliver_full = GNUNET_NO;
3130 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
3131 deliver_full = GNUNET_YES;
3134 for (tpos = 0; tpos < cpos->tcnt; tpos++)
3136 if (type != cpos->types[tpos])
3138 deliver_full = GNUNET_YES;
3142 if (GNUNET_YES == deliver_full)
3144 send_p2p_message_to_client (sender, cpos, m, msize);
3145 dropped = GNUNET_NO;
3147 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
3149 send_p2p_message_to_client (sender, cpos, m,
3150 sizeof (struct GNUNET_MessageHeader));
3154 if (dropped == GNUNET_YES)
3157 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3158 "Message of type %u from `%4s' not delivered to any client.\n",
3159 (unsigned int) type,
3160 GNUNET_i2s (&sender->peer));
3162 /* FIXME: stats... */
3168 * Align P2P message and then deliver to interested clients.
3170 * @param sender who sent us the message?
3171 * @param buffer unaligned (!) buffer containing message
3172 * @param msize size of the message (including header)
3175 align_and_deliver (struct Neighbour *sender, const char *buffer, size_t msize)
3179 /* TODO: call to statistics? */
3180 memcpy (abuf, buffer, msize);
3181 deliver_message (sender, (const struct GNUNET_MessageHeader *) abuf, msize);
3186 * Deliver P2P messages to interested clients.
3188 * @param sender who sent us the message?
3189 * @param buffer buffer containing messages, can be modified
3190 * @param buffer_size size of the buffer (overall)
3191 * @param offset offset where messages in the buffer start
3194 deliver_messages (struct Neighbour *sender,
3195 const char *buffer, size_t buffer_size, size_t offset)
3197 struct GNUNET_MessageHeader *mhp;
3198 struct GNUNET_MessageHeader mh;
3202 while (offset + sizeof (struct GNUNET_MessageHeader) <= buffer_size)
3204 if (0 != offset % sizeof (uint16_t))
3206 /* outch, need to copy to access header */
3207 memcpy (&mh, &buffer[offset], sizeof (struct GNUNET_MessageHeader));
3212 /* can access header directly */
3213 mhp = (struct GNUNET_MessageHeader *) &buffer[offset];
3215 msize = ntohs (mhp->size);
3216 if (msize + offset > buffer_size)
3218 /* malformed message, header says it is larger than what
3219 would fit into the overall buffer */
3220 GNUNET_break_op (0);
3223 #if HAVE_UNALIGNED_64_ACCESS
3224 need_align = (0 != offset % 4) ? GNUNET_YES : GNUNET_NO;
3226 need_align = (0 != offset % 8) ? GNUNET_YES : GNUNET_NO;
3228 if (GNUNET_YES == need_align)
3229 align_and_deliver (sender, &buffer[offset], msize);
3231 deliver_message (sender,
3232 (const struct GNUNET_MessageHeader *)
3233 &buffer[offset], msize);
3240 * We received an encrypted message. Decrypt, validate and
3241 * pass on to the appropriate clients.
3244 handle_encrypted_message (struct Neighbour *n,
3245 const struct EncryptedMessage *m)
3247 size_t size = ntohs (m->header.size);
3249 struct EncryptedMessage *pt; /* plaintext */
3252 struct GNUNET_TIME_Absolute t;
3256 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3257 "Core service receives `%s' request from `%4s'.\n",
3258 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
3260 GNUNET_CRYPTO_hash (&m->iv_seed, sizeof (uint32_t), &iv);
3266 &buf[ENCRYPTED_HEADER_SIZE],
3267 size - ENCRYPTED_HEADER_SIZE))
3269 pt = (struct EncryptedMessage *) buf;
3271 GNUNET_CRYPTO_hash (&pt->sequence_number,
3272 size - ENCRYPTED_HEADER_SIZE - sizeof (GNUNET_HashCode), &ph);
3274 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3275 "V-Hashed %u bytes of plaintext (`%s') using IV `%d'\n",
3276 (unsigned int) (size - ENCRYPTED_HEADER_SIZE - sizeof (GNUNET_HashCode)),
3280 if (0 != memcmp (&ph,
3281 &pt->plaintext_hash,
3282 sizeof (GNUNET_HashCode)))
3284 /* checksum failed */
3285 GNUNET_break_op (0);
3289 /* validate sequence number */
3290 snum = ntohl (pt->sequence_number);
3291 if (n->last_sequence_number_received == snum)
3293 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3294 "Received duplicate message, ignoring.\n");
3295 /* duplicate, ignore */
3296 GNUNET_STATISTICS_set (stats,
3297 gettext_noop ("# bytes dropped (duplicates)"),
3302 if ((n->last_sequence_number_received > snum) &&
3303 (n->last_sequence_number_received - snum > 32))
3305 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3306 "Received ancient out of sequence message, ignoring.\n");
3307 /* ancient out of sequence, ignore */
3308 GNUNET_STATISTICS_set (stats,
3309 gettext_noop ("# bytes dropped (out of sequence)"),
3314 if (n->last_sequence_number_received > snum)
3316 unsigned int rotbit =
3317 1 << (n->last_sequence_number_received - snum - 1);
3318 if ((n->last_packets_bitmap & rotbit) != 0)
3320 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3321 "Received duplicate message, ignoring.\n");
3322 GNUNET_STATISTICS_set (stats,
3323 gettext_noop ("# bytes dropped (duplicates)"),
3326 /* duplicate, ignore */
3329 n->last_packets_bitmap |= rotbit;
3331 if (n->last_sequence_number_received < snum)
3333 n->last_packets_bitmap <<= (snum - n->last_sequence_number_received);
3334 n->last_sequence_number_received = snum;
3337 /* check timestamp */
3338 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
3339 if (GNUNET_TIME_absolute_get_duration (t).value > MAX_MESSAGE_AGE.value)
3341 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3343 ("Message received far too old (%llu ms). Content ignored.\n"),
3344 GNUNET_TIME_absolute_get_duration (t).value);
3345 GNUNET_STATISTICS_set (stats,
3346 gettext_noop ("# bytes dropped (ancient message)"),
3352 /* process decrypted message(s) */
3353 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
3355 #if DEBUG_CORE_SET_QUOTA
3356 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3357 "Received %u b/s as new inbound limit for peer `%4s'\n",
3358 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
3359 GNUNET_i2s (&n->peer));
3361 n->bw_out_external_limit = pt->inbound_bw_limit;
3362 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3363 n->bw_out_internal_limit);
3364 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3366 GNUNET_TRANSPORT_set_quota (transport,
3370 GNUNET_TIME_UNIT_FOREVER_REL,
3373 n->last_activity = GNUNET_TIME_absolute_get ();
3374 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3375 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3377 = GNUNET_SCHEDULER_add_delayed (sched,
3378 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3381 GNUNET_STATISTICS_set (stats,
3382 gettext_noop ("# bytes of payload decrypted"),
3383 size - sizeof (struct EncryptedMessage),
3385 deliver_messages (n, buf, size, sizeof (struct EncryptedMessage));
3390 * Function called by the transport for each received message.
3392 * @param cls closure
3393 * @param peer (claimed) identity of the other peer
3394 * @param message the message
3395 * @param latency estimated latency for communicating with the
3396 * given peer (round-trip)
3397 * @param distance in overlay hops, as given by transport plugin
3400 handle_transport_receive (void *cls,
3401 const struct GNUNET_PeerIdentity *peer,
3402 const struct GNUNET_MessageHeader *message,
3403 struct GNUNET_TIME_Relative latency,
3404 unsigned int distance)
3406 struct Neighbour *n;
3407 struct GNUNET_TIME_Absolute now;
3413 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3414 "Received message of type %u from `%4s', demultiplexing.\n",
3415 (unsigned int) ntohs (message->type),
3418 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3423 n = find_neighbour (peer);
3425 n = create_neighbour (peer);
3426 n->last_latency = latency;
3427 n->last_distance = distance;
3428 up = (n->status == PEER_STATE_KEY_CONFIRMED);
3429 type = ntohs (message->type);
3430 size = ntohs (message->size);
3433 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
3434 if (size != sizeof (struct SetKeyMessage))
3436 GNUNET_break_op (0);
3439 GNUNET_STATISTICS_update (stats, gettext_noop ("# session keys received"), 1, GNUNET_NO);
3440 handle_set_key (n, (const struct SetKeyMessage *) message);
3442 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3443 if (size < sizeof (struct EncryptedMessage) +
3444 sizeof (struct GNUNET_MessageHeader))
3446 GNUNET_break_op (0);
3449 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3450 (n->status != PEER_STATE_KEY_CONFIRMED))
3452 GNUNET_break_op (0);
3453 /* blacklist briefly (?); might help recover (?) */
3454 GNUNET_TRANSPORT_blacklist (sched, cfg,
3456 GNUNET_TIME_UNIT_SECONDS,
3457 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
3462 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3464 case GNUNET_MESSAGE_TYPE_CORE_PING:
3465 if (size != sizeof (struct PingMessage))
3467 GNUNET_break_op (0);
3470 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
3471 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3472 (n->status != PEER_STATE_KEY_CONFIRMED))
3475 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3476 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3477 "PING", GNUNET_i2s (&n->peer));
3479 GNUNET_free_non_null (n->pending_ping);
3480 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3481 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3484 handle_ping (n, (const struct PingMessage *) message);
3486 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3487 if (size != sizeof (struct PongMessage))
3489 GNUNET_break_op (0);
3492 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
3493 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3494 (n->status != PEER_STATE_KEY_CONFIRMED) )
3497 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3498 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3499 "PONG", GNUNET_i2s (&n->peer));
3501 GNUNET_free_non_null (n->pending_pong);
3502 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
3503 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
3506 handle_pong (n, (const struct PongMessage *) message);
3509 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3510 _("Unsupported message of type %u received.\n"),
3511 (unsigned int) type);
3514 if (n->status == PEER_STATE_KEY_CONFIRMED)
3516 now = GNUNET_TIME_absolute_get ();
3517 n->last_activity = now;
3520 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), 1, GNUNET_NO);
3521 n->time_established = now;
3523 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3524 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3526 = GNUNET_SCHEDULER_add_delayed (sched,
3527 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3535 * Function that recalculates the bandwidth quota for the
3536 * given neighbour and transmits it to the transport service.
3538 * @param cls neighbour for the quota update
3542 neighbour_quota_update (void *cls,
3543 const struct GNUNET_SCHEDULER_TaskContext *tc)
3545 struct Neighbour *n = cls;
3546 struct GNUNET_BANDWIDTH_Value32NBO q_in;
3549 unsigned long long distributable;
3550 uint64_t need_per_peer;
3551 uint64_t need_per_second;
3553 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
3554 /* calculate relative preference among all neighbours;
3555 divides by a bit more to avoid division by zero AND to
3556 account for possibility of new neighbours joining any time
3557 AND to convert to double... */
3558 if (preference_sum == 0)
3560 pref_rel = 1.0 / (double) neighbour_count;
3564 pref_rel = n->current_preference / preference_sum;
3566 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
3567 GNUNET_TIME_UNIT_SECONDS);
3568 need_per_second = need_per_peer * neighbour_count;
3570 if (bandwidth_target_out_bps > need_per_second)
3571 distributable = bandwidth_target_out_bps - need_per_second;
3572 share = distributable * pref_rel;
3573 if (share + need_per_peer > ( (uint32_t)-1))
3574 q_in = GNUNET_BANDWIDTH_value_init ((uint32_t) -1);
3576 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
3577 /* check if we want to disconnect for good due to inactivity */
3578 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) &&
3579 (GNUNET_TIME_absolute_get_duration (n->time_established).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) )
3582 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3583 "Forcing disconnect of `%4s' due to inactivity\n",
3584 GNUNET_i2s (&n->peer));
3586 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
3588 #if DEBUG_CORE_QUOTA
3589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3590 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
3591 GNUNET_i2s (&n->peer),
3592 (unsigned int) ntohl (q_in.value__),
3593 bandwidth_target_out_bps,
3594 (unsigned int) ntohl (n->bw_in.value__),
3595 (unsigned int) ntohl (n->bw_out.value__),
3596 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
3598 if (n->bw_in.value__ != q_in.value__)
3601 if (GNUNET_YES == n->is_connected)
3602 GNUNET_TRANSPORT_set_quota (transport,
3606 GNUNET_TIME_UNIT_FOREVER_REL,
3609 schedule_quota_update (n);
3614 * Function called by transport to notify us that
3615 * a peer connected to us (on the network level).
3617 * @param cls closure
3618 * @param peer the peer that connected
3619 * @param latency current latency of the connection
3620 * @param distance in overlay hops, as given by transport plugin
3623 handle_transport_notify_connect (void *cls,
3624 const struct GNUNET_PeerIdentity *peer,
3625 struct GNUNET_TIME_Relative latency,
3626 unsigned int distance)
3628 struct Neighbour *n;
3629 struct ConnectNotifyMessage cnm;
3631 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3636 n = find_neighbour (peer);
3639 if (GNUNET_YES == n->is_connected)
3641 /* duplicate connect notification!? */
3648 n = create_neighbour (peer);
3650 GNUNET_STATISTICS_update (stats,
3651 gettext_noop ("# peers connected (transport)"),
3654 n->is_connected = GNUNET_YES;
3655 n->last_latency = latency;
3656 n->last_distance = distance;
3657 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
3660 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
3664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3665 "Received connection from `%4s'.\n",
3666 GNUNET_i2s (&n->peer));
3668 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
3669 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_PRE_CONNECT);
3670 cnm.distance = htonl (n->last_distance);
3671 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
3673 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_PRE_CONNECT);
3674 GNUNET_TRANSPORT_set_quota (transport,
3678 GNUNET_TIME_UNIT_FOREVER_REL,
3685 * Function called by transport telling us that a peer
3688 * @param cls closure
3689 * @param peer the peer that disconnected
3692 handle_transport_notify_disconnect (void *cls,
3693 const struct GNUNET_PeerIdentity *peer)
3695 struct DisconnectNotifyMessage cnm;
3696 struct Neighbour *n;
3699 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3700 "Peer `%4s' disconnected from us.\n", GNUNET_i2s (peer));
3702 n = find_neighbour (peer);
3708 GNUNET_break (n->is_connected);
3709 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
3710 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
3712 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
3713 n->is_connected = GNUNET_NO;
3714 GNUNET_STATISTICS_update (stats,
3715 gettext_noop ("# peers connected (transport)"),
3722 * Last task run during shutdown. Disconnects us from
3726 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3728 struct Neighbour *n;
3732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3733 "Core service shutting down.\n");
3735 GNUNET_assert (transport != NULL);
3736 GNUNET_TRANSPORT_disconnect (transport);
3738 while (NULL != (n = neighbours))
3740 neighbours = n->next;
3741 GNUNET_assert (neighbour_count > 0);
3745 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
3746 GNUNET_SERVER_notification_context_destroy (notifier);
3748 while (NULL != (c = clients))
3749 handle_client_disconnect (NULL, c->client_handle);
3750 if (my_private_key != NULL)
3751 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3753 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3758 * Initiate core service.
3760 * @param cls closure
3761 * @param s scheduler to use
3762 * @param serv the initialized server
3763 * @param c configuration to use
3767 struct GNUNET_SCHEDULER_Handle *s,
3768 struct GNUNET_SERVER_Handle *serv,
3769 const struct GNUNET_CONFIGURATION_Handle *c)
3775 /* parse configuration */
3778 GNUNET_CONFIGURATION_get_value_number (c,
3781 &bandwidth_target_in_bps)) ||
3783 GNUNET_CONFIGURATION_get_value_number (c,
3786 &bandwidth_target_out_bps)) ||
3788 GNUNET_CONFIGURATION_get_value_filename (c,
3790 "HOSTKEY", &keyfile)))
3792 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3794 ("Core service is lacking key configuration settings. Exiting.\n"));
3795 GNUNET_SCHEDULER_shutdown (s);
3798 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3799 GNUNET_free (keyfile);
3800 if (my_private_key == NULL)
3802 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3803 _("Core service could not access hostkey. Exiting.\n"));
3804 GNUNET_SCHEDULER_shutdown (s);
3807 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3808 GNUNET_CRYPTO_hash (&my_public_key,
3809 sizeof (my_public_key), &my_identity.hashPubKey);
3810 /* setup notification */
3812 notifier = GNUNET_SERVER_notification_context_create (server,
3814 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
3815 /* setup transport connection */
3816 transport = GNUNET_TRANSPORT_connect (sched,
3819 &handle_transport_receive,
3820 &handle_transport_notify_connect,
3821 &handle_transport_notify_disconnect);
3822 GNUNET_assert (NULL != transport);
3823 stats = GNUNET_STATISTICS_create (sched, "core", cfg);
3824 GNUNET_SCHEDULER_add_delayed (sched,
3825 GNUNET_TIME_UNIT_FOREVER_REL,
3826 &cleaning_task, NULL);
3827 /* process client requests */
3828 GNUNET_SERVER_add_handlers (server, handlers);
3829 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3830 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
3836 * The main function for the transport service.
3838 * @param argc number of arguments from the command line
3839 * @param argv command line arguments
3840 * @return 0 ok, 1 on error
3843 main (int argc, char *const *argv)
3845 return (GNUNET_OK ==
3846 GNUNET_SERVICE_run (argc,
3849 GNUNET_SERVICE_OPTION_NONE,
3850 &run, NULL)) ? 0 : 1;
3853 /* end of gnunet-service-core.c */