2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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13 General Public License for more details.
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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_NO
47 #define DEBUG_CORE_QUOTA GNUNET_NO
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 1024
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, 10)
85 * 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, 1)
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
147 * State machine for our P2P encryption handshake. Everyone starts in
148 * "DOWN", if we receive the other peer's key (other peer initiated)
149 * we start in state RECEIVED (since we will immediately send our
150 * own); otherwise we start in SENT. If we get back a PONG from
151 * within either state, we move up to CONFIRMED (the PONG will always
152 * be sent back encrypted with the key we sent to the other peer).
154 enum PeerStateMachine
158 PEER_STATE_KEY_RECEIVED,
159 PEER_STATE_KEY_CONFIRMED
164 * Number of bytes (at the beginning) of "struct EncryptedMessage"
165 * that are NOT encrypted.
167 #define ENCRYPTED_HEADER_SIZE (sizeof(struct GNUNET_MessageHeader) + sizeof(uint32_t))
171 * Encapsulation for encrypted messages exchanged between
172 * peers. Followed by the actual encrypted data.
174 struct EncryptedMessage
177 * Message type is either CORE_ENCRYPTED_MESSAGE.
179 struct GNUNET_MessageHeader header;
182 * Random value used for IV generation. ENCRYPTED_HEADER_SIZE must
183 * be set to the offset of the *next* field.
185 uint32_t iv_seed GNUNET_PACKED;
188 * Hash of the plaintext (starting at 'sequence_number'), used to
189 * verify message integrity. Everything after this hash (including
190 * this hash itself) will be encrypted.
192 GNUNET_HashCode hmac;
195 * Sequence number, in network byte order. This field
196 * must be the first encrypted/decrypted field and the
197 * first byte that is hashed for the plaintext hash.
199 uint32_t sequence_number GNUNET_PACKED;
202 * Desired bandwidth (how much we should send to this peer / how
203 * much is the sender willing to receive)?
205 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
208 * Timestamp. Used to prevent reply of ancient messages
209 * (recent messages are caught with the sequence number).
211 struct GNUNET_TIME_AbsoluteNBO timestamp;
217 * We're sending an (encrypted) PING to the other peer to check if he
218 * can decrypt. The other peer should respond with a PONG with the
219 * same content, except this time encrypted with the receiver's key.
224 * Message type is CORE_PING.
226 struct GNUNET_MessageHeader header;
229 * Random number chosen to make reply harder.
231 uint32_t challenge GNUNET_PACKED;
234 * Intended target of the PING, used primarily to check
235 * that decryption actually worked.
237 struct GNUNET_PeerIdentity target;
243 * Response to a PING. Includes data from the original PING
244 * plus initial bandwidth quota information.
249 * Message type is CORE_PONG.
251 struct GNUNET_MessageHeader header;
254 * Random number proochosen to make reply harder. Must be
255 * first field after header (this is where we start to encrypt!).
257 uint32_t challenge GNUNET_PACKED;
262 uint32_t reserved GNUNET_PACKED;
265 * Desired bandwidth (how much we should send to this
266 * peer / how much is the sender willing to receive).
268 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
271 * Intended target of the PING, used primarily to check
272 * that decryption actually worked.
274 struct GNUNET_PeerIdentity target;
279 * Message transmitted to set (or update) a session key.
285 * Message type is either CORE_SET_KEY.
287 struct GNUNET_MessageHeader header;
290 * Status of the sender (should be in "enum PeerStateMachine"), nbo.
292 int32_t sender_status GNUNET_PACKED;
295 * Purpose of the signature, will be
296 * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
298 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
301 * At what time was this key created?
303 struct GNUNET_TIME_AbsoluteNBO creation_time;
306 * The encrypted session key.
308 struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
311 * Who is the intended recipient?
313 struct GNUNET_PeerIdentity target;
316 * Signature of the stuff above (starting at purpose).
318 struct GNUNET_CRYPTO_RsaSignature signature;
324 * Message waiting for transmission. This struct
325 * is followed by the actual content of the message.
331 * We keep messages in a doubly linked list.
333 struct MessageEntry *next;
336 * We keep messages in a doubly linked list.
338 struct MessageEntry *prev;
341 * By when are we supposed to transmit this message?
343 struct GNUNET_TIME_Absolute deadline;
346 * By when are we supposed to transmit this message (after
349 struct GNUNET_TIME_Absolute slack_deadline;
352 * How important is this message to us?
354 unsigned int priority;
357 * If this is a SET_KEY message, what was our connection status when this
358 * message was queued?
360 enum PeerStateMachine sender_status;
363 * Is this a SET_KEY message?
368 * How long is the message? (number of bytes following
369 * the "struct MessageEntry", but not including the
370 * size of "struct MessageEntry" itself!)
375 * Was this message selected for transmission in the
376 * current round? GNUNET_YES or GNUNET_NO.
381 * Did we give this message some slack (delayed sending) previously
382 * (and hence should not give it any more slack)? GNUNET_YES or
393 * We keep neighbours in a linked list (for now).
395 struct Neighbour *next;
398 * Unencrypted messages destined for this peer.
400 struct MessageEntry *messages;
403 * Head of the batched, encrypted message queue (already ordered,
404 * transmit starting with the head).
406 struct MessageEntry *encrypted_head;
409 * Tail of the batched, encrypted message queue (already ordered,
410 * append new messages to tail)
412 struct MessageEntry *encrypted_tail;
415 * Handle for pending requests for transmission to this peer
416 * with the transport service. NULL if no request is pending.
418 struct GNUNET_TRANSPORT_TransmitHandle *th;
421 * Public key of the neighbour, NULL if we don't have it yet.
423 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
426 * We received a PING message before we got the "public_key"
427 * (or the SET_KEY). We keep it here until we have a key
428 * to decrypt it. NULL if no PING is pending.
430 struct PingMessage *pending_ping;
433 * We received a PONG message before we got the "public_key"
434 * (or the SET_KEY). We keep it here until we have a key
435 * to decrypt it. NULL if no PONG is pending.
437 struct PongMessage *pending_pong;
440 * Non-NULL if we are currently looking up HELLOs for this peer.
443 struct GNUNET_PEERINFO_IteratorContext *pitr;
446 * SetKeyMessage to transmit, NULL if we are not currently trying
449 struct SetKeyMessage *skm;
452 * Identity of the neighbour.
454 struct GNUNET_PeerIdentity peer;
457 * Key we use to encrypt our messages for the other peer
458 * (initialized by us when we do the handshake).
460 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
463 * Key we use to decrypt messages from the other peer
464 * (given to us by the other peer during the handshake).
466 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
469 * ID of task used for re-trying plaintext scheduling.
471 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
474 * ID of task used for re-trying SET_KEY and PING message.
476 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
479 * ID of task used for updating bandwidth quota for this neighbour.
481 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
484 * ID of task used for sending keep-alive pings.
486 GNUNET_SCHEDULER_TaskIdentifier keep_alive_task;
489 * ID of task used for cleaning up dead neighbour entries.
491 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
494 * At what time did we generate our encryption key?
496 struct GNUNET_TIME_Absolute encrypt_key_created;
499 * At what time did the other peer generate the decryption key?
501 struct GNUNET_TIME_Absolute decrypt_key_created;
504 * At what time did we initially establish (as in, complete session
505 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
507 struct GNUNET_TIME_Absolute time_established;
510 * At what time did we last receive an encrypted message from the
511 * other peer? Should be zero if status != KEY_CONFIRMED.
513 struct GNUNET_TIME_Absolute last_activity;
516 * Last latency observed from this peer.
518 struct GNUNET_TIME_Relative last_latency;
521 * At what frequency are we currently re-trying SET_KEY messages?
523 struct GNUNET_TIME_Relative set_key_retry_frequency;
526 * Tracking bandwidth for sending to this peer.
528 struct GNUNET_BANDWIDTH_Tracker available_send_window;
531 * Tracking bandwidth for receiving from this peer.
533 struct GNUNET_BANDWIDTH_Tracker available_recv_window;
536 * How valueable were the messages of this peer recently?
538 unsigned long long current_preference;
541 * Bit map indicating which of the 32 sequence numbers before the last
542 * were received (good for accepting out-of-order packets and
543 * estimating reliability of the connection)
545 unsigned int last_packets_bitmap;
548 * last sequence number received on this connection (highest)
550 uint32_t last_sequence_number_received;
553 * last sequence number transmitted
555 uint32_t last_sequence_number_sent;
558 * Available bandwidth in for this peer (current target).
560 struct GNUNET_BANDWIDTH_Value32NBO bw_in;
563 * Available bandwidth out for this peer (current target).
565 struct GNUNET_BANDWIDTH_Value32NBO bw_out;
568 * Internal bandwidth limit set for this peer (initially typically
569 * set to "-1"). Actual "bw_out" is MIN of
570 * "bpm_out_internal_limit" and "bw_out_external_limit".
572 struct GNUNET_BANDWIDTH_Value32NBO bw_out_internal_limit;
575 * External bandwidth limit set for this peer by the
576 * peer that we are communicating with. "bw_out" is MIN of
577 * "bw_out_internal_limit" and "bw_out_external_limit".
579 struct GNUNET_BANDWIDTH_Value32NBO bw_out_external_limit;
582 * What was our PING challenge number (for this peer)?
584 uint32_t ping_challenge;
587 * What was the last distance to this peer as reported by the transports?
589 uint32_t last_distance;
592 * What is our connection status?
594 enum PeerStateMachine status;
597 * Are we currently connected to this neighbour?
605 * Data structure for each client connected to the core service.
610 * Clients are kept in a linked list.
615 * Handle for the client with the server API.
617 struct GNUNET_SERVER_Client *client_handle;
620 * Array of the types of messages this peer cares
621 * about (with "tcnt" entries). Allocated as part
622 * of this client struct, do not free!
624 const uint16_t *types;
627 * Options for messages this client cares about,
628 * see GNUNET_CORE_OPTION_ values.
633 * Number of types of incoming messages this client
634 * specifically cares about. Size of the "types" array.
644 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
649 static struct GNUNET_PeerIdentity my_identity;
654 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
659 struct GNUNET_SCHEDULER_Handle *sched;
662 * Handle to peerinfo service.
664 static struct GNUNET_PEERINFO_Handle *peerinfo;
667 * Our message stream tokenizer (for encrypted payload).
669 static struct GNUNET_SERVER_MessageStreamTokenizer *mst;
674 const struct GNUNET_CONFIGURATION_Handle *cfg;
679 static struct GNUNET_TRANSPORT_Handle *transport;
682 * Linked list of our clients.
684 static struct Client *clients;
687 * Context for notifications we need to send to our clients.
689 static struct GNUNET_SERVER_NotificationContext *notifier;
692 * We keep neighbours in a linked list (for now).
694 static struct Neighbour *neighbours;
697 * For creating statistics.
699 static struct GNUNET_STATISTICS_Handle *stats;
702 * Sum of all preferences among all neighbours.
704 static unsigned long long preference_sum;
707 * Total number of neighbours we have.
709 static unsigned int neighbour_count;
712 * How much inbound bandwidth are we supposed to be using per second?
713 * FIXME: this value is not used!
715 static unsigned long long bandwidth_target_in_bps;
718 * How much outbound bandwidth are we supposed to be using per second?
720 static unsigned long long bandwidth_target_out_bps;
725 * A preference value for a neighbour was update. Update
726 * the preference sum accordingly.
728 * @param inc how much was a preference value increased?
731 update_preference_sum (unsigned long long inc)
734 unsigned long long os;
737 preference_sum += inc;
738 if (preference_sum >= os)
740 /* overflow! compensate by cutting all values in half! */
745 n->current_preference /= 2;
746 preference_sum += n->current_preference;
749 GNUNET_STATISTICS_set (stats, gettext_noop ("# total peer preference"), preference_sum, GNUNET_NO);
754 * Find the entry for the given neighbour.
756 * @param peer identity of the neighbour
757 * @return NULL if we are not connected, otherwise the
760 static struct Neighbour *
761 find_neighbour (const struct GNUNET_PeerIdentity *peer)
763 struct Neighbour *ret;
766 while ((ret != NULL) &&
767 (0 != memcmp (&ret->peer,
768 peer, sizeof (struct GNUNET_PeerIdentity))))
775 * Send a message to one of our clients.
777 * @param client target for the message
778 * @param msg message to transmit
779 * @param can_drop could this message be dropped if the
780 * client's queue is getting too large?
783 send_to_client (struct Client *client,
784 const struct GNUNET_MessageHeader *msg,
787 #if DEBUG_CORE_CLIENT
788 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
789 "Preparing to send %u bytes of message of type %u to client.\n",
790 (unsigned int) ntohs (msg->size),
791 (unsigned int) ntohs (msg->type));
793 GNUNET_SERVER_notification_context_unicast (notifier,
794 client->client_handle,
801 * Send a message to all of our current clients that have
802 * the right options set.
804 * @param msg message to multicast
805 * @param can_drop can this message be discarded if the queue is too long
806 * @param options mask to use
809 send_to_all_clients (const struct GNUNET_MessageHeader *msg,
818 if (0 != (c->options & options))
820 #if DEBUG_CORE_CLIENT
821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
822 "Sending message of type %u to client.\n",
823 (unsigned int) ntohs (msg->type));
825 send_to_client (c, msg, can_drop);
833 * Function called by transport telling us that a peer
836 * @param peer the peer that changed status
839 handle_peer_status_change (struct Neighbour *n)
841 struct PeerStatusNotifyMessage psnm;
843 if (! n->is_connected)
846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
847 "Peer `%4s' changed status\n",
848 GNUNET_i2s (&n->peer));
850 psnm.header.size = htons (sizeof (struct PeerStatusNotifyMessage));
851 psnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE);
852 psnm.distance = htonl (n->last_distance);
853 psnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
854 psnm.timeout = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_add (n->last_activity,
855 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
856 psnm.bandwidth_in = n->bw_in;
857 psnm.bandwidth_out = n->bw_out;
859 send_to_all_clients (&psnm.header,
861 GNUNET_CORE_OPTION_SEND_STATUS_CHANGE);
862 GNUNET_STATISTICS_update (stats,
863 gettext_noop ("# peer status changes"),
870 * Handle CORE_INIT request.
873 handle_client_init (void *cls,
874 struct GNUNET_SERVER_Client *client,
875 const struct GNUNET_MessageHeader *message)
877 const struct InitMessage *im;
878 struct InitReplyMessage irm;
881 const uint16_t *types;
884 struct ConnectNotifyMessage cnm;
887 #if DEBUG_CORE_CLIENT
888 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
889 "Client connecting to core service with `%s' message\n",
892 /* check that we don't have an entry already */
896 if (client == c->client_handle)
899 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
904 msize = ntohs (message->size);
905 if (msize < sizeof (struct InitMessage))
908 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
911 GNUNET_SERVER_notification_context_add (notifier, client);
912 im = (const struct InitMessage *) message;
913 types = (const uint16_t *) &im[1];
914 msize -= sizeof (struct InitMessage);
915 c = GNUNET_malloc (sizeof (struct Client) + msize);
916 c->client_handle = client;
919 c->tcnt = msize / sizeof (uint16_t);
920 c->types = (const uint16_t *) &c[1];
921 wtypes = (uint16_t *) &c[1];
922 for (i=0;i<c->tcnt;i++)
923 wtypes[i] = ntohs (types[i]);
924 c->options = ntohl (im->options);
925 #if DEBUG_CORE_CLIENT
926 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
927 "Client %p is interested in %u message types\n",
929 (unsigned int) c->tcnt);
931 /* send init reply message */
932 irm.header.size = htons (sizeof (struct InitReplyMessage));
933 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
934 irm.reserved = htonl (0);
935 memcpy (&irm.publicKey,
937 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
938 #if DEBUG_CORE_CLIENT
939 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
940 "Sending `%s' message to client.\n", "INIT_REPLY");
942 send_to_client (c, &irm.header, GNUNET_NO);
943 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
945 /* notify new client about existing neighbours */
946 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
947 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
951 if (n->status == PEER_STATE_KEY_CONFIRMED)
953 #if DEBUG_CORE_CLIENT
954 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
955 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
957 cnm.distance = htonl (n->last_distance);
958 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
960 send_to_client (c, &cnm.header, GNUNET_NO);
965 GNUNET_SERVER_receive_done (client, GNUNET_OK);
970 * A client disconnected, clean up.
973 * @param client identification of the client
976 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
983 #if DEBUG_CORE_CLIENT
984 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
985 "Client %p has disconnected from core service.\n",
992 if (client == pos->client_handle)
997 prev->next = pos->next;
1004 /* client never sent INIT */
1009 * Handle REQUEST_INFO request.
1012 handle_client_request_info (void *cls,
1013 struct GNUNET_SERVER_Client *client,
1014 const struct GNUNET_MessageHeader *message)
1016 const struct RequestInfoMessage *rcm;
1017 struct Neighbour *n;
1018 struct ConfigurationInfoMessage cim;
1019 int32_t want_reserv;
1021 unsigned long long old_preference;
1022 struct GNUNET_SERVER_TransmitContext *tc;
1024 #if DEBUG_CORE_CLIENT
1025 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1026 "Core service receives `%s' request.\n", "REQUEST_INFO");
1028 rcm = (const struct RequestInfoMessage *) message;
1029 n = find_neighbour (&rcm->peer);
1030 memset (&cim, 0, sizeof (cim));
1033 want_reserv = ntohl (rcm->reserve_inbound);
1034 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1036 n->bw_out_internal_limit = rcm->limit_outbound;
1037 if (n->bw_out.value__ != GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1038 n->bw_out_external_limit).value__)
1040 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1041 n->bw_out_external_limit);
1042 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1044 GNUNET_TRANSPORT_set_quota (transport,
1048 GNUNET_TIME_UNIT_FOREVER_REL,
1050 handle_peer_status_change (n);
1053 if (want_reserv < 0)
1055 got_reserv = want_reserv;
1057 else if (want_reserv > 0)
1059 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1060 want_reserv).value == 0)
1061 got_reserv = want_reserv;
1063 got_reserv = 0; /* all or nothing */
1067 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1069 old_preference = n->current_preference;
1070 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1071 if (old_preference > n->current_preference)
1073 /* overflow; cap at maximum value */
1074 n->current_preference = ULLONG_MAX;
1076 update_preference_sum (n->current_preference - old_preference);
1077 #if DEBUG_CORE_QUOTA
1078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1079 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1081 GNUNET_i2s (&rcm->peer),
1084 cim.reserved_amount = htonl (got_reserv);
1085 cim.bw_in = n->bw_in;
1086 cim.bw_out = n->bw_out;
1087 cim.preference = n->current_preference;
1089 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1090 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1091 cim.peer = rcm->peer;
1093 #if DEBUG_CORE_CLIENT
1094 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1095 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1097 tc = GNUNET_SERVER_transmit_context_create (client);
1098 GNUNET_SERVER_transmit_context_append_message (tc, &cim.header);
1099 GNUNET_SERVER_transmit_context_run (tc,
1100 GNUNET_TIME_UNIT_FOREVER_REL);
1105 * Free the given entry for the neighbour (it has
1106 * already been removed from the list at this point).
1108 * @param n neighbour to free
1111 free_neighbour (struct Neighbour *n)
1113 struct MessageEntry *m;
1116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1117 "Destroying neighbour entry for peer `%4s'\n",
1118 GNUNET_i2s (&n->peer));
1120 if (n->pitr != NULL)
1122 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1127 GNUNET_free (n->skm);
1130 while (NULL != (m = n->messages))
1132 n->messages = m->next;
1135 while (NULL != (m = n->encrypted_head))
1137 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1144 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1147 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1148 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1149 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1150 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
1151 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1152 GNUNET_SCHEDULER_cancel (sched, n->quota_update_task);
1153 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1154 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1155 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1156 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
1157 if (n->status == PEER_STATE_KEY_CONFIRMED)
1158 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), -1, GNUNET_NO);
1159 GNUNET_free_non_null (n->public_key);
1160 GNUNET_free_non_null (n->pending_ping);
1161 GNUNET_free_non_null (n->pending_pong);
1167 * Check if we have encrypted messages for the specified neighbour
1168 * pending, and if so, check with the transport about sending them
1171 * @param n neighbour to check.
1173 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1177 * Encrypt size bytes from in and write the result to out. Use the
1178 * key for outbound traffic of the given neighbour.
1180 * @param n neighbour we are sending to
1181 * @param iv initialization vector to use
1182 * @param in ciphertext
1183 * @param out plaintext
1184 * @param size size of in/out
1185 * @return GNUNET_OK on success
1188 do_encrypt (struct Neighbour *n,
1189 const GNUNET_HashCode * iv,
1190 const void *in, void *out, size_t size)
1192 if (size != (uint16_t) size)
1197 GNUNET_assert (size ==
1198 GNUNET_CRYPTO_aes_encrypt (in,
1202 GNUNET_CRYPTO_AesInitializationVector
1204 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1206 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1207 "Encrypted %u bytes for `%4s' using key %u\n",
1208 (unsigned int) size,
1209 GNUNET_i2s (&n->peer),
1210 (unsigned int) n->encrypt_key.crc32);
1217 * Consider freeing the given neighbour since we may not need
1218 * to keep it around anymore.
1220 * @param n neighbour to consider discarding
1223 consider_free_neighbour (struct Neighbour *n);
1227 * Task triggered when a neighbour entry is about to time out
1228 * (and we should prevent this by sending a PING).
1230 * @param cls the 'struct Neighbour'
1231 * @param tc scheduler context (not used)
1234 send_keep_alive (void *cls,
1235 const struct GNUNET_SCHEDULER_TaskContext *tc)
1237 struct Neighbour *n = cls;
1238 struct GNUNET_TIME_Relative retry;
1239 struct GNUNET_TIME_Relative left;
1240 struct MessageEntry *me;
1241 struct PingMessage pp;
1242 struct PingMessage *pm;
1244 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1246 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1247 sizeof (struct PingMessage));
1248 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1249 me->priority = PING_PRIORITY;
1250 me->size = sizeof (struct PingMessage);
1251 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1255 pm = (struct PingMessage *) &me[1];
1256 pm->header.size = htons (sizeof (struct PingMessage));
1257 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1258 pp.challenge = htonl (n->ping_challenge);
1259 pp.target = n->peer;
1261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1262 "Encrypting `%s' message with challenge %u for `%4s' using key %u.\n",
1264 (unsigned int) n->ping_challenge,
1265 GNUNET_i2s (&n->peer),
1266 (unsigned int) n->encrypt_key.crc32);
1269 &n->peer.hashPubKey,
1272 sizeof (struct PingMessage) -
1273 sizeof (struct GNUNET_MessageHeader));
1274 process_encrypted_neighbour_queue (n);
1275 /* reschedule PING job */
1276 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1277 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1278 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1279 MIN_PING_FREQUENCY);
1281 = GNUNET_SCHEDULER_add_delayed (sched,
1290 * Task triggered when a neighbour entry might have gotten stale.
1292 * @param cls the 'struct Neighbour'
1293 * @param tc scheduler context (not used)
1296 consider_free_task (void *cls,
1297 const struct GNUNET_SCHEDULER_TaskContext *tc)
1299 struct Neighbour *n = cls;
1301 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1302 consider_free_neighbour (n);
1307 * Consider freeing the given neighbour since we may not need
1308 * to keep it around anymore.
1310 * @param n neighbour to consider discarding
1313 consider_free_neighbour (struct Neighbour *n)
1315 struct Neighbour *pos;
1316 struct Neighbour *prev;
1317 struct GNUNET_TIME_Relative left;
1319 if ( (n->th != NULL) ||
1320 (n->pitr != NULL) ||
1321 (GNUNET_YES == n->is_connected) )
1322 return; /* no chance */
1324 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1325 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1328 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1329 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1330 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
1332 &consider_free_task,
1336 /* actually free the neighbour... */
1345 neighbours = n->next;
1347 prev->next = n->next;
1348 GNUNET_assert (neighbour_count > 0);
1350 GNUNET_STATISTICS_set (stats,
1351 gettext_noop ("# neighbour entries allocated"),
1359 * Function called when the transport service is ready to
1360 * receive an encrypted message for the respective peer
1362 * @param cls neighbour to use message from
1363 * @param size number of bytes we can transmit
1364 * @param buf where to copy the message
1365 * @return number of bytes transmitted
1368 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1370 struct Neighbour *n = cls;
1371 struct MessageEntry *m;
1376 m = n->encrypted_head;
1380 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1381 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1382 GNUNET_i2s (&n->peer));
1386 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1393 GNUNET_assert (size >= m->size);
1394 memcpy (cbuf, &m[1], m->size);
1396 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1400 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1401 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1403 GNUNET_i2s (&n->peer));
1405 process_encrypted_neighbour_queue (n);
1410 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1411 "Transmission of message of type %u and size %u failed\n",
1412 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1413 (unsigned int) m->size);
1417 consider_free_neighbour (n);
1423 * Check if we have plaintext messages for the specified neighbour
1424 * pending, and if so, consider batching and encrypting them (and
1425 * then trigger processing of the encrypted queue if needed).
1427 * @param n neighbour to check.
1429 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1433 * Check if we have encrypted messages for the specified neighbour
1434 * pending, and if so, check with the transport about sending them
1437 * @param n neighbour to check.
1440 process_encrypted_neighbour_queue (struct Neighbour *n)
1442 struct MessageEntry *m;
1445 return; /* request already pending */
1446 m = n->encrypted_head;
1449 /* encrypted queue empty, try plaintext instead */
1450 process_plaintext_neighbour_queue (n);
1454 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1455 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1456 (unsigned int) m->size,
1457 GNUNET_i2s (&n->peer),
1458 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).
1462 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1465 GNUNET_TIME_absolute_get_remaining
1467 ¬ify_encrypted_transmit_ready,
1471 /* message request too large or duplicate request */
1473 /* discard encrypted message */
1474 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1478 process_encrypted_neighbour_queue (n);
1484 * Decrypt size bytes from in and write the result to out. Use the
1485 * key for inbound traffic of the given neighbour. This function does
1486 * NOT do any integrity-checks on the result.
1488 * @param n neighbour we are receiving from
1489 * @param iv initialization vector to use
1490 * @param in ciphertext
1491 * @param out plaintext
1492 * @param size size of in/out
1493 * @return GNUNET_OK on success
1496 do_decrypt (struct Neighbour *n,
1497 const GNUNET_HashCode * iv,
1498 const void *in, void *out, size_t size)
1500 if (size != (uint16_t) size)
1505 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1506 (n->status != PEER_STATE_KEY_CONFIRMED))
1508 GNUNET_break_op (0);
1509 return GNUNET_SYSERR;
1512 GNUNET_CRYPTO_aes_decrypt (in,
1516 GNUNET_CRYPTO_AesInitializationVector *) iv,
1520 return GNUNET_SYSERR;
1522 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes decrypted"), size, GNUNET_NO);
1524 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1525 "Decrypted %u bytes from `%4s' using key %u\n",
1526 (unsigned int) size,
1527 GNUNET_i2s (&n->peer),
1528 (unsigned int) n->decrypt_key.crc32);
1535 * Select messages for transmission. This heuristic uses a combination
1536 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1537 * and priority-based discard (in case no feasible schedule exist) and
1538 * speculative optimization (defer any kind of transmission until
1539 * we either create a batch of significant size, 25% of max, or until
1540 * we are close to a deadline). Furthermore, when scheduling the
1541 * heuristic also packs as many messages into the batch as possible,
1542 * starting with those with the earliest deadline. Yes, this is fun.
1544 * @param n neighbour to select messages from
1545 * @param size number of bytes to select for transmission
1546 * @param retry_time set to the time when we should try again
1547 * (only valid if this function returns zero)
1548 * @return number of bytes selected, or 0 if we decided to
1549 * defer scheduling overall; in that case, retry_time is set.
1552 select_messages (struct Neighbour *n,
1553 size_t size, struct GNUNET_TIME_Relative *retry_time)
1555 struct MessageEntry *pos;
1556 struct MessageEntry *min;
1557 struct MessageEntry *last;
1558 unsigned int min_prio;
1559 struct GNUNET_TIME_Absolute t;
1560 struct GNUNET_TIME_Absolute now;
1561 struct GNUNET_TIME_Relative delta;
1563 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
1566 unsigned int queue_size;
1567 int discard_low_prio;
1569 GNUNET_assert (NULL != n->messages);
1570 now = GNUNET_TIME_absolute_get ();
1571 /* last entry in linked list of messages processed */
1573 /* should we remove the entry with the lowest
1574 priority from consideration for scheduling at the
1585 discard_low_prio = GNUNET_YES;
1586 while (GNUNET_YES == discard_low_prio)
1589 min_prio = UINT_MAX;
1590 discard_low_prio = GNUNET_NO;
1591 /* calculate number of bytes available for transmission at time "t" */
1592 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
1594 /* how many bytes have we (hypothetically) scheduled so far */
1596 /* maximum time we can wait before transmitting anything
1597 and still make all of our deadlines */
1598 slack = GNUNET_TIME_UNIT_FOREVER_REL;
1600 /* note that we use "*2" here because we want to look
1601 a bit further into the future; much more makes no
1602 sense since new message might be scheduled in the
1604 while ((pos != NULL) && (off < size * 2))
1606 if (pos->do_transmit == GNUNET_YES)
1608 /* already removed from consideration */
1612 if (discard_low_prio == GNUNET_NO)
1614 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
1615 if (delta.value > 0)
1617 // FIXME: HUH? Check!
1619 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
1622 if (avail < pos->size)
1624 // FIXME: HUH? Check!
1625 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1630 /* update slack, considering both its absolute deadline
1631 and relative deadlines caused by other messages
1632 with their respective load */
1633 slack = GNUNET_TIME_relative_min (slack,
1634 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
1636 if (pos->deadline.value <= now.value)
1639 slack = GNUNET_TIME_UNIT_ZERO;
1641 else if (GNUNET_YES == pos->got_slack)
1643 /* should be soon now! */
1644 slack = GNUNET_TIME_relative_min (slack,
1645 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
1650 GNUNET_TIME_relative_min (slack,
1651 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
1652 pos->got_slack = GNUNET_YES;
1653 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
1654 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
1659 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
1660 if (pos->priority <= min_prio)
1662 /* update min for discard */
1663 min_prio = pos->priority;
1668 if (discard_low_prio)
1670 GNUNET_assert (min != NULL);
1671 /* remove lowest-priority entry from consideration */
1672 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1676 /* guard against sending "tiny" messages with large headers without
1678 if ( (slack.value > GNUNET_CONSTANTS_MAX_CORK_DELAY.value) &&
1680 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
1682 /* less than 25% of message would be filled with deadlines still
1683 being met if we delay by one second or more; so just wait for
1684 more data; but do not wait longer than 1s (since we don't want
1685 to delay messages for a really long time either). */
1686 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
1687 /* reset do_transmit values for next time */
1690 pos->do_transmit = GNUNET_NO;
1694 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1695 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
1696 (unsigned long long) retry_time->value,
1698 (unsigned int) size);
1702 /* select marked messages (up to size) for transmission */
1707 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
1709 pos->do_transmit = GNUNET_YES; /* mark for transmission */
1713 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1714 "Selecting message of size %u for transmission\n",
1715 (unsigned int) pos->size);
1721 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1722 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
1723 (unsigned int) pos->size,
1726 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
1731 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1732 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
1733 (unsigned long long) off, (unsigned long long) tsize,
1734 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
1735 GNUNET_i2s (&n->peer));
1742 * Batch multiple messages into a larger buffer.
1744 * @param n neighbour to take messages from
1745 * @param buf target buffer
1746 * @param size size of buf
1747 * @param deadline set to transmission deadline for the result
1748 * @param retry_time set to the time when we should try again
1749 * (only valid if this function returns zero)
1750 * @param priority set to the priority of the batch
1751 * @return number of bytes written to buf (can be zero)
1754 batch_message (struct Neighbour *n,
1757 struct GNUNET_TIME_Absolute *deadline,
1758 struct GNUNET_TIME_Relative *retry_time,
1759 unsigned int *priority)
1761 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1762 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
1763 struct MessageEntry *pos;
1764 struct MessageEntry *prev;
1765 struct MessageEntry *next;
1770 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1771 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
1772 if (0 == select_messages (n, size, retry_time))
1775 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1776 "No messages selected, will try again in %llu ms\n",
1781 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
1782 ntm->distance = htonl (n->last_distance);
1783 ntm->latency = GNUNET_TIME_relative_hton (n->last_latency);
1784 ntm->peer = n->peer;
1787 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
1790 if (GNUNET_YES == pos->do_transmit)
1792 GNUNET_assert (pos->size <= size);
1793 /* do notifications */
1794 /* FIXME: track if we have *any* client that wants
1795 full notifications and only do this if that is
1797 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
1799 memcpy (&ntm[1], &pos[1], pos->size);
1800 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1801 sizeof (struct GNUNET_MessageHeader));
1802 send_to_all_clients (&ntm->header,
1804 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
1808 /* message too large for 'full' notifications, we do at
1809 least the 'hdr' type */
1812 sizeof (struct GNUNET_MessageHeader));
1814 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1816 send_to_all_clients (&ntm->header,
1818 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
1820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1821 "Encrypting %u bytes with message of type %u and size %u\n",
1823 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
1824 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
1826 /* copy for encrypted transmission */
1827 memcpy (&buf[ret], &pos[1], pos->size);
1830 *priority += pos->priority;
1832 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1833 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
1834 (unsigned int) pos->size,
1835 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).value);
1837 deadline->value = GNUNET_MIN (deadline->value, pos->deadline.value);
1851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1852 "Deadline for message batch is %llu ms\n",
1853 GNUNET_TIME_absolute_get_remaining (*deadline).value);
1860 * Remove messages with deadlines that have long expired from
1863 * @param n neighbour to inspect
1866 discard_expired_messages (struct Neighbour *n)
1868 struct MessageEntry *prev;
1869 struct MessageEntry *next;
1870 struct MessageEntry *pos;
1871 struct GNUNET_TIME_Absolute now;
1872 struct GNUNET_TIME_Relative delta;
1874 now = GNUNET_TIME_absolute_get ();
1880 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
1881 if (delta.value > PAST_EXPIRATION_DISCARD_TIME.value)
1884 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1885 "Message is %llu ms past due, discarding.\n",
1902 * Signature of the main function of a task.
1904 * @param cls closure
1905 * @param tc context information (why was this task triggered now)
1908 retry_plaintext_processing (void *cls,
1909 const struct GNUNET_SCHEDULER_TaskContext *tc)
1911 struct Neighbour *n = cls;
1913 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1914 process_plaintext_neighbour_queue (n);
1919 * Send our key (and encrypted PING) to the other peer.
1921 * @param n the other peer
1923 static void send_key (struct Neighbour *n);
1926 * Task that will retry "send_key" if our previous attempt failed
1930 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1932 struct Neighbour *n = cls;
1935 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1936 "Retrying key transmission to `%4s'\n",
1937 GNUNET_i2s (&n->peer));
1939 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
1940 n->set_key_retry_frequency =
1941 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
1947 * Check if we have plaintext messages for the specified neighbour
1948 * pending, and if so, consider batching and encrypting them (and
1949 * then trigger processing of the encrypted queue if needed).
1951 * @param n neighbour to check.
1954 process_plaintext_neighbour_queue (struct Neighbour *n)
1956 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
1959 struct EncryptedMessage *em; /* encrypted message */
1960 struct EncryptedMessage *ph; /* plaintext header */
1961 struct MessageEntry *me;
1962 unsigned int priority;
1963 struct GNUNET_TIME_Absolute deadline;
1964 struct GNUNET_TIME_Relative retry_time;
1967 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1969 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1970 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1974 case PEER_STATE_DOWN:
1977 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1978 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1979 GNUNET_i2s(&n->peer));
1982 case PEER_STATE_KEY_SENT:
1983 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1984 n->retry_set_key_task
1985 = GNUNET_SCHEDULER_add_delayed (sched,
1986 n->set_key_retry_frequency,
1987 &set_key_retry_task, n);
1989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1990 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1991 GNUNET_i2s(&n->peer));
1994 case PEER_STATE_KEY_RECEIVED:
1995 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1996 n->retry_set_key_task
1997 = GNUNET_SCHEDULER_add_delayed (sched,
1998 n->set_key_retry_frequency,
1999 &set_key_retry_task, n);
2001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2002 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2003 GNUNET_i2s(&n->peer));
2006 case PEER_STATE_KEY_CONFIRMED:
2007 /* ready to continue */
2010 discard_expired_messages (n);
2011 if (n->messages == NULL)
2014 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2015 "Plaintext message queue for `%4s' is empty.\n",
2016 GNUNET_i2s(&n->peer));
2018 return; /* no pending messages */
2020 if (n->encrypted_head != NULL)
2023 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2024 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2025 GNUNET_i2s(&n->peer));
2027 return; /* wait for messages already encrypted to be
2030 ph = (struct EncryptedMessage *) pbuf;
2031 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2033 used = sizeof (struct EncryptedMessage);
2034 used += batch_message (n,
2036 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2037 &deadline, &retry_time, &priority);
2038 if (used == sizeof (struct EncryptedMessage))
2041 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2042 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2043 GNUNET_i2s(&n->peer));
2045 /* no messages selected for sending, try again later... */
2046 n->retry_plaintext_task =
2047 GNUNET_SCHEDULER_add_delayed (sched,
2049 &retry_plaintext_processing, n);
2052 #if DEBUG_CORE_QUOTA
2053 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2054 "Sending %u b/s as new limit to peer `%4s'\n",
2055 (unsigned int) ntohl (n->bw_in.value__),
2056 GNUNET_i2s (&n->peer));
2058 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX));
2059 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2060 ph->inbound_bw_limit = n->bw_in;
2061 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2063 /* setup encryption message header */
2064 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2065 me->deadline = deadline;
2066 me->priority = priority;
2068 em = (struct EncryptedMessage *) &me[1];
2069 em->header.size = htons (used);
2070 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2071 em->iv_seed = ph->iv_seed;
2072 esize = used - ENCRYPTED_HEADER_SIZE;
2073 GNUNET_CRYPTO_hmac (&n->encrypt_key,
2074 &ph->sequence_number,
2075 esize - sizeof (GNUNET_HashCode),
2077 GNUNET_CRYPTO_hash (&ph->iv_seed, sizeof (uint32_t), &iv);
2079 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2080 "Hashed %u bytes of plaintext (`%s') using IV `%d'\n",
2081 (unsigned int) (esize - sizeof (GNUNET_HashCode)),
2082 GNUNET_h2s (&ph->hmac),
2087 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2088 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2089 (unsigned int) esize,
2090 GNUNET_i2s(&n->peer),
2091 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).value);
2093 GNUNET_assert (GNUNET_OK ==
2098 /* append to transmission list */
2099 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2103 process_encrypted_neighbour_queue (n);
2108 * Function that recalculates the bandwidth quota for the
2109 * given neighbour and transmits it to the transport service.
2111 * @param cls neighbour for the quota update
2115 neighbour_quota_update (void *cls,
2116 const struct GNUNET_SCHEDULER_TaskContext *tc);
2120 * Schedule the task that will recalculate the bandwidth
2121 * quota for this peer (and possibly force a disconnect of
2122 * idle peers by calculating a bandwidth of zero).
2125 schedule_quota_update (struct Neighbour *n)
2127 GNUNET_assert (n->quota_update_task ==
2128 GNUNET_SCHEDULER_NO_TASK);
2129 n->quota_update_task
2130 = GNUNET_SCHEDULER_add_delayed (sched,
2131 QUOTA_UPDATE_FREQUENCY,
2132 &neighbour_quota_update,
2138 * Initialize a new 'struct Neighbour'.
2140 * @param pid ID of the new neighbour
2141 * @return handle for the new neighbour
2143 static struct Neighbour *
2144 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2146 struct Neighbour *n;
2147 struct GNUNET_TIME_Absolute now;
2150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2151 "Creating neighbour entry for peer `%4s'\n",
2154 n = GNUNET_malloc (sizeof (struct Neighbour));
2155 n->next = neighbours;
2158 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
2160 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2161 now = GNUNET_TIME_absolute_get ();
2162 n->encrypt_key_created = now;
2163 n->last_activity = now;
2164 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2165 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2166 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2167 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2168 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2169 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2171 neighbour_quota_update (n, NULL);
2172 consider_free_neighbour (n);
2178 * Handle CORE_SEND request.
2181 * @param client the client issuing the request
2182 * @param message the "struct SendMessage"
2185 handle_client_send (void *cls,
2186 struct GNUNET_SERVER_Client *client,
2187 const struct GNUNET_MessageHeader *message)
2189 const struct SendMessage *sm;
2190 struct Neighbour *n;
2191 struct MessageEntry *prev;
2192 struct MessageEntry *pos;
2193 struct MessageEntry *e;
2194 struct MessageEntry *min_prio_entry;
2195 struct MessageEntry *min_prio_prev;
2196 unsigned int min_prio;
2197 unsigned int queue_size;
2200 msize = ntohs (message->size);
2202 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2206 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2209 sm = (const struct SendMessage *) message;
2210 msize -= sizeof (struct SendMessage);
2211 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2213 /* FIXME: should we not allow loopback-injection here? */
2216 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2219 n = find_neighbour (&sm->peer);
2221 n = create_neighbour (&sm->peer);
2223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2224 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2226 (unsigned int) msize,
2227 GNUNET_i2s (&sm->peer));
2229 /* bound queue size */
2230 discard_expired_messages (n);
2231 min_prio = UINT32_MAX;
2232 min_prio_entry = NULL;
2233 min_prio_prev = NULL;
2239 if (pos->priority < min_prio)
2241 min_prio_entry = pos;
2242 min_prio_prev = prev;
2243 min_prio = pos->priority;
2249 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2252 if (ntohl(sm->priority) <= min_prio)
2254 /* discard new entry */
2256 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2257 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2259 (unsigned int) MAX_PEER_QUEUE_SIZE,
2260 (unsigned int) msize,
2261 (unsigned int) ntohs (message->type));
2264 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2267 /* discard "min_prio_entry" */
2269 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2270 "Queue full, discarding existing older request\n");
2272 if (min_prio_prev == NULL)
2273 n->messages = min_prio_entry->next;
2275 min_prio_prev->next = min_prio_entry->next;
2276 GNUNET_free (min_prio_entry);
2280 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2281 "Adding transmission request for `%4s' of size %u to queue\n",
2282 GNUNET_i2s (&sm->peer),
2283 (unsigned int) msize);
2285 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2286 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2287 e->priority = ntohl (sm->priority);
2289 memcpy (&e[1], &sm[1], msize);
2291 /* insert, keep list sorted by deadline */
2294 while ((pos != NULL) && (pos->deadline.value < e->deadline.value))
2305 /* consider scheduling now */
2306 process_plaintext_neighbour_queue (n);
2308 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2313 * Function called when the transport service is ready to
2314 * receive a message. Only resets 'n->th' to NULL.
2316 * @param cls neighbour to use message from
2317 * @param size number of bytes we can transmit
2318 * @param buf where to copy the message
2319 * @return number of bytes transmitted
2322 notify_transport_connect_done (void *cls, size_t size, void *buf)
2324 struct Neighbour *n = cls;
2329 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2330 _("Failed to connect to `%4s': transport failed to connect\n"),
2331 GNUNET_i2s (&n->peer));
2334 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2335 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2336 GNUNET_i2s (&n->peer));
2337 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2338 GNUNET_SCHEDULER_cancel (sched,
2339 n->retry_set_key_task);
2340 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (sched,
2341 &set_key_retry_task,
2348 * Handle CORE_REQUEST_CONNECT request.
2351 * @param client the client issuing the request
2352 * @param message the "struct ConnectMessage"
2355 handle_client_request_connect (void *cls,
2356 struct GNUNET_SERVER_Client *client,
2357 const struct GNUNET_MessageHeader *message)
2359 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2360 struct Neighbour *n;
2361 struct GNUNET_TIME_Relative timeout;
2363 if (0 == memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2366 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2369 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2370 n = find_neighbour (&cm->peer);
2372 n = create_neighbour (&cm->peer);
2373 if ( (GNUNET_YES == n->is_connected) ||
2375 return; /* already connected, or at least trying */
2376 GNUNET_STATISTICS_update (stats, gettext_noop ("# connection requests received"), 1, GNUNET_NO);
2378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2379 "Core received `%s' request for `%4s', will try to establish connection\n",
2381 GNUNET_i2s (&cm->peer));
2383 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2384 /* ask transport to connect to the peer */
2385 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2387 sizeof (struct GNUNET_MessageHeader), 0,
2389 ¬ify_transport_connect_done,
2391 GNUNET_break (NULL != n->th);
2396 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2397 * the neighbour's struct and retry send_key. Or, if we did not get a
2398 * HELLO, just do nothing.
2400 * @param cls the 'struct Neighbour' to retry sending the key for
2401 * @param peer the peer for which this is the HELLO
2402 * @param hello HELLO message of that peer
2405 process_hello_retry_send_key (void *cls,
2406 const struct GNUNET_PeerIdentity *peer,
2407 const struct GNUNET_HELLO_Message *hello)
2409 struct Neighbour *n = cls;
2414 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2415 "Entered `%s' and `%s' is NULL!\n",
2416 "process_hello_retry_send_key",
2420 if (n->public_key != NULL)
2422 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2424 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2425 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2427 GNUNET_STATISTICS_update (stats,
2428 gettext_noop ("# SET_KEY messages deferred (need public key)"),
2436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2437 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
2438 GNUNET_i2s (&n->peer));
2440 GNUNET_STATISTICS_update (stats,
2441 gettext_noop ("# Delayed connecting due to lack of public key"),
2444 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2445 n->retry_set_key_task
2446 = GNUNET_SCHEDULER_add_delayed (sched,
2447 n->set_key_retry_frequency,
2448 &set_key_retry_task, n);
2454 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2455 "Entered `%s' for peer `%4s'\n",
2456 "process_hello_retry_send_key",
2459 if (n->public_key != NULL)
2461 /* already have public key, why are we here? */
2467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2468 "Received new `%s' message for `%4s', initiating key exchange.\n",
2473 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2474 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2476 GNUNET_STATISTICS_update (stats,
2477 gettext_noop ("# Error extracting public key from HELLO"),
2480 GNUNET_free (n->public_key);
2481 n->public_key = NULL;
2483 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2484 "GNUNET_HELLO_get_key returned awfully\n");
2492 * Send our key (and encrypted PING) to the other peer.
2494 * @param n the other peer
2497 send_key (struct Neighbour *n)
2499 struct MessageEntry *pos;
2500 struct SetKeyMessage *sm;
2501 struct MessageEntry *me;
2502 struct PingMessage pp;
2503 struct PingMessage *pm;
2505 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2507 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2508 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2510 if (n->pitr != NULL)
2513 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2514 "Key exchange in progress with `%4s'.\n",
2515 GNUNET_i2s (&n->peer));
2517 return; /* already in progress */
2519 if (GNUNET_YES != n->is_connected)
2522 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2523 "Not yet connected to peer `%4s'!\n",
2524 GNUNET_i2s (&n->peer));
2528 GNUNET_STATISTICS_update (stats,
2529 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
2532 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2534 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
2536 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2537 ¬ify_encrypted_transmit_ready,
2543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2544 "Asked to perform key exchange with `%4s'.\n",
2545 GNUNET_i2s (&n->peer));
2547 if (n->public_key == NULL)
2549 /* lookup n's public key, then try again */
2551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2552 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2553 GNUNET_i2s (&n->peer));
2555 GNUNET_assert (n->pitr == NULL);
2556 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
2558 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2559 &process_hello_retry_send_key, n);
2562 pos = n->encrypted_head;
2565 if (GNUNET_YES == pos->is_setkey)
2567 if (pos->sender_status == n->status)
2570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2571 "`%s' message for `%4s' queued already\n",
2573 GNUNET_i2s (&n->peer));
2575 goto trigger_processing;
2577 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
2582 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2583 "Removing queued `%s' message for `%4s', will create a new one\n",
2585 GNUNET_i2s (&n->peer));
2595 case PEER_STATE_DOWN:
2596 n->status = PEER_STATE_KEY_SENT;
2598 case PEER_STATE_KEY_SENT:
2600 case PEER_STATE_KEY_RECEIVED:
2602 case PEER_STATE_KEY_CONFIRMED:
2610 /* first, set key message */
2611 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2612 sizeof (struct SetKeyMessage) +
2613 sizeof (struct PingMessage));
2614 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
2615 me->priority = SET_KEY_PRIORITY;
2616 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
2617 me->is_setkey = GNUNET_YES;
2618 me->got_slack = GNUNET_YES; /* do not defer this one! */
2619 me->sender_status = n->status;
2620 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2624 sm = (struct SetKeyMessage *) &me[1];
2625 sm->header.size = htons (sizeof (struct SetKeyMessage));
2626 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
2627 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
2628 PEER_STATE_KEY_SENT : n->status));
2630 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2631 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2632 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2633 sizeof (struct GNUNET_PeerIdentity));
2634 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
2635 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
2636 sm->target = n->peer;
2637 GNUNET_assert (GNUNET_OK ==
2638 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
2640 GNUNET_CRYPTO_AesSessionKey),
2642 &sm->encrypted_key));
2643 GNUNET_assert (GNUNET_OK ==
2644 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
2646 pm = (struct PingMessage *) &sm[1];
2647 pm->header.size = htons (sizeof (struct PingMessage));
2648 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
2649 pp.challenge = htonl (n->ping_challenge);
2650 pp.target = n->peer;
2652 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2653 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u.\n",
2655 (unsigned int) n->ping_challenge,
2656 GNUNET_i2s (&n->peer),
2657 (unsigned int) n->encrypt_key.crc32);
2660 &n->peer.hashPubKey,
2663 sizeof (struct PingMessage) -
2664 sizeof (struct GNUNET_MessageHeader));
2665 GNUNET_STATISTICS_update (stats,
2666 gettext_noop ("# SET_KEY and PING messages created"),
2670 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2671 "Have %llu ms left for `%s' transmission.\n",
2672 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).value,
2676 /* trigger queue processing */
2677 process_encrypted_neighbour_queue (n);
2678 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
2679 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
2680 n->retry_set_key_task
2681 = GNUNET_SCHEDULER_add_delayed (sched,
2682 n->set_key_retry_frequency,
2683 &set_key_retry_task, n);
2688 * We received a SET_KEY message. Validate and update
2689 * our key material and status.
2691 * @param n the neighbour from which we received message m
2692 * @param m the set key message we received
2695 handle_set_key (struct Neighbour *n,
2696 const struct SetKeyMessage *m);
2700 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2701 * the neighbour's struct and retry handling the set_key message. Or,
2702 * if we did not get a HELLO, just free the set key message.
2704 * @param cls pointer to the set key message
2705 * @param peer the peer for which this is the HELLO
2706 * @param hello HELLO message of that peer
2709 process_hello_retry_handle_set_key (void *cls,
2710 const struct GNUNET_PeerIdentity *peer,
2711 const struct GNUNET_HELLO_Message *hello)
2713 struct Neighbour *n = cls;
2714 struct SetKeyMessage *sm = n->skm;
2720 if (n->public_key != NULL)
2723 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2724 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
2726 GNUNET_i2s (&n->peer),
2729 handle_set_key (n, sm);
2733 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2734 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
2736 GNUNET_i2s (&n->peer));
2741 if (n->public_key != NULL)
2742 return; /* multiple HELLOs match!? */
2744 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2745 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2747 GNUNET_break_op (0);
2748 GNUNET_free (n->public_key);
2749 n->public_key = NULL;
2755 * We received a PING message. Validate and transmit
2758 * @param n sender of the PING
2759 * @param m the encrypted PING message itself
2762 handle_ping (struct Neighbour *n, const struct PingMessage *m)
2764 struct PingMessage t;
2765 struct PongMessage tx;
2766 struct PongMessage *tp;
2767 struct MessageEntry *me;
2770 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2771 "Core service receives `%s' request from `%4s'.\n",
2772 "PING", GNUNET_i2s (&n->peer));
2776 &my_identity.hashPubKey,
2779 sizeof (struct PingMessage) -
2780 sizeof (struct GNUNET_MessageHeader)))
2783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2784 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u\n",
2786 GNUNET_i2s (&t.target),
2787 (unsigned int) ntohl (t.challenge),
2788 (unsigned int) n->decrypt_key.crc32);
2790 GNUNET_STATISTICS_update (stats,
2791 gettext_noop ("# PING messages decrypted"),
2794 if (0 != memcmp (&t.target,
2795 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2797 GNUNET_break_op (0);
2800 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2801 sizeof (struct PongMessage));
2802 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2806 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
2807 me->priority = PONG_PRIORITY;
2808 me->size = sizeof (struct PongMessage);
2809 tx.reserved = htonl (0);
2810 tx.inbound_bw_limit = n->bw_in;
2811 tx.challenge = t.challenge;
2812 tx.target = t.target;
2813 tp = (struct PongMessage *) &me[1];
2814 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
2815 tp->header.size = htons (sizeof (struct PongMessage));
2817 &my_identity.hashPubKey,
2820 sizeof (struct PongMessage) -
2821 sizeof (struct GNUNET_MessageHeader));
2822 GNUNET_STATISTICS_update (stats,
2823 gettext_noop ("# PONG messages created"),
2827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2828 "Encrypting `%s' with challenge %u using key %u\n",
2830 (unsigned int) ntohl (t.challenge),
2831 (unsigned int) n->encrypt_key.crc32);
2833 /* trigger queue processing */
2834 process_encrypted_neighbour_queue (n);
2839 * We received a PONG message. Validate and update our status.
2841 * @param n sender of the PONG
2842 * @param m the encrypted PONG message itself
2845 handle_pong (struct Neighbour *n,
2846 const struct PongMessage *m)
2848 struct PongMessage t;
2849 struct ConnectNotifyMessage cnm;
2852 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2853 "Core service receives `%s' response from `%4s'.\n",
2854 "PONG", GNUNET_i2s (&n->peer));
2856 /* mark as garbage, just to be sure */
2857 memset (&t, 255, sizeof (t));
2860 &n->peer.hashPubKey,
2863 sizeof (struct PongMessage) -
2864 sizeof (struct GNUNET_MessageHeader)))
2866 GNUNET_break_op (0);
2869 GNUNET_STATISTICS_update (stats,
2870 gettext_noop ("# PONG messages decrypted"),
2873 if (0 != ntohl (t.reserved))
2875 GNUNET_break_op (0);
2879 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2880 "Decrypted `%s' from `%4s' with challenge %u using key %u\n",
2882 GNUNET_i2s (&t.target),
2883 (unsigned int) ntohl (t.challenge),
2884 (unsigned int) n->decrypt_key.crc32);
2886 if ((0 != memcmp (&t.target,
2888 sizeof (struct GNUNET_PeerIdentity))) ||
2889 (n->ping_challenge != ntohl (t.challenge)))
2891 /* PONG malformed */
2893 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2894 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
2896 GNUNET_i2s (&n->peer),
2897 (unsigned int) n->ping_challenge);
2898 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2899 "Received malformed `%s' received from `%4s' with challenge %u\n",
2900 "PONG", GNUNET_i2s (&t.target),
2901 (unsigned int) ntohl (t.challenge));
2903 GNUNET_break_op (0);
2908 case PEER_STATE_DOWN:
2909 GNUNET_break (0); /* should be impossible */
2911 case PEER_STATE_KEY_SENT:
2912 GNUNET_break (0); /* should be impossible, how did we decrypt? */
2914 case PEER_STATE_KEY_RECEIVED:
2915 GNUNET_STATISTICS_update (stats,
2916 gettext_noop ("# Session keys confirmed via PONG"),
2919 n->status = PEER_STATE_KEY_CONFIRMED;
2920 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
2922 n->bw_out_external_limit = t.inbound_bw_limit;
2923 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
2924 n->bw_out_internal_limit);
2925 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
2927 GNUNET_TRANSPORT_set_quota (transport,
2931 GNUNET_TIME_UNIT_FOREVER_REL,
2935 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2936 "Confirmed key via `%s' message for peer `%4s'\n",
2937 "PONG", GNUNET_i2s (&n->peer));
2939 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2941 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2942 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2944 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
2945 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
2946 cnm.distance = htonl (n->last_distance);
2947 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
2949 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
2950 process_encrypted_neighbour_queue (n);
2952 case PEER_STATE_KEY_CONFIRMED:
2953 n->last_activity = GNUNET_TIME_absolute_get ();
2954 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
2955 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
2957 = GNUNET_SCHEDULER_add_delayed (sched,
2958 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
2961 handle_peer_status_change (n);
2971 * We received a SET_KEY message. Validate and update
2972 * our key material and status.
2974 * @param n the neighbour from which we received message m
2975 * @param m the set key message we received
2978 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
2980 struct SetKeyMessage *m_cpy;
2981 struct GNUNET_TIME_Absolute t;
2982 struct GNUNET_CRYPTO_AesSessionKey k;
2983 struct PingMessage *ping;
2984 struct PongMessage *pong;
2985 enum PeerStateMachine sender_status;
2988 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2989 "Core service receives `%s' request from `%4s'.\n",
2990 "SET_KEY", GNUNET_i2s (&n->peer));
2992 if (n->public_key == NULL)
2994 if (n->pitr != NULL)
2997 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2998 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3004 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3005 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3007 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3008 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3009 /* lookup n's public key, then try again */
3010 GNUNET_assert (n->skm == NULL);
3012 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3014 GNUNET_TIME_UNIT_MINUTES,
3015 &process_hello_retry_handle_set_key, n);
3016 GNUNET_STATISTICS_update (stats,
3017 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3022 if (0 != memcmp (&m->target,
3024 sizeof (struct GNUNET_PeerIdentity)))
3026 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3027 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3029 GNUNET_i2s (&m->target));
3032 if ((ntohl (m->purpose.size) !=
3033 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3034 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3035 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3036 sizeof (struct GNUNET_PeerIdentity)) ||
3038 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3039 &m->purpose, &m->signature, n->public_key)))
3041 /* invalid signature */
3042 GNUNET_break_op (0);
3045 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3046 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3047 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3048 (t.value < n->decrypt_key_created.value))
3050 /* this could rarely happen due to massive re-ordering of
3051 messages on the network level, but is most likely either
3052 a bug or some adversary messing with us. Report. */
3053 GNUNET_break_op (0);
3057 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3058 "Decrypting key material.\n");
3060 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3063 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3064 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3065 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3067 /* failed to decrypt !? */
3068 GNUNET_break_op (0);
3071 GNUNET_STATISTICS_update (stats,
3072 gettext_noop ("# SET_KEY messages decrypted"),
3076 if (n->decrypt_key_created.value != t.value)
3078 /* fresh key, reset sequence numbers */
3079 n->last_sequence_number_received = 0;
3080 n->last_packets_bitmap = 0;
3081 n->decrypt_key_created = t;
3083 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3086 case PEER_STATE_DOWN:
3087 n->status = PEER_STATE_KEY_RECEIVED;
3089 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3090 "Responding to `%s' with my own key.\n", "SET_KEY");
3094 case PEER_STATE_KEY_SENT:
3095 case PEER_STATE_KEY_RECEIVED:
3096 n->status = PEER_STATE_KEY_RECEIVED;
3097 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3098 (sender_status != PEER_STATE_KEY_CONFIRMED))
3101 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3102 "Responding to `%s' with my own key (other peer has status %u).\n",
3104 (unsigned int) sender_status);
3109 case PEER_STATE_KEY_CONFIRMED:
3110 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3111 (sender_status != PEER_STATE_KEY_CONFIRMED))
3114 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3115 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3117 (unsigned int) sender_status);
3126 if (n->pending_ping != NULL)
3128 ping = n->pending_ping;
3129 n->pending_ping = NULL;
3130 handle_ping (n, ping);
3133 if (n->pending_pong != NULL)
3135 pong = n->pending_pong;
3136 n->pending_pong = NULL;
3137 handle_pong (n, pong);
3144 * Send a P2P message to a client.
3146 * @param sender who sent us the message?
3147 * @param client who should we give the message to?
3148 * @param m contains the message to transmit
3149 * @param msize number of bytes in buf to transmit
3152 send_p2p_message_to_client (struct Neighbour *sender,
3153 struct Client *client,
3154 const void *m, size_t msize)
3156 char buf[msize + sizeof (struct NotifyTrafficMessage)];
3157 struct NotifyTrafficMessage *ntm;
3160 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3161 "Core service passes message from `%4s' of type %u to client.\n",
3162 GNUNET_i2s(&sender->peer),
3163 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3165 ntm = (struct NotifyTrafficMessage *) buf;
3166 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
3167 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3168 ntm->distance = htonl (sender->last_distance);
3169 ntm->latency = GNUNET_TIME_relative_hton (sender->last_latency);
3170 ntm->peer = sender->peer;
3171 memcpy (&ntm[1], m, msize);
3172 send_to_client (client, &ntm->header, GNUNET_YES);
3177 * Deliver P2P message to interested clients.
3179 * @param cls always NULL
3180 * @param client who sent us the message (struct Neighbour)
3181 * @param m the message
3184 deliver_message (void *cls,
3186 const struct GNUNET_MessageHeader *m)
3188 struct Neighbour *sender = client;
3189 size_t msize = ntohs (m->size);
3191 struct Client *cpos;
3197 type = ntohs (m->type);
3199 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3200 "Received encapsulated message of type %u and size %u from `%4s'\n",
3201 (unsigned int) type,
3203 GNUNET_i2s (&sender->peer));
3205 GNUNET_snprintf (buf,
3207 gettext_noop ("# bytes of messages of type %u received"),
3208 (unsigned int) type);
3209 GNUNET_STATISTICS_set (stats,
3213 dropped = GNUNET_YES;
3215 while (cpos != NULL)
3217 deliver_full = GNUNET_NO;
3218 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
3219 deliver_full = GNUNET_YES;
3222 for (tpos = 0; tpos < cpos->tcnt; tpos++)
3224 if (type != cpos->types[tpos])
3226 deliver_full = GNUNET_YES;
3230 if (GNUNET_YES == deliver_full)
3232 send_p2p_message_to_client (sender, cpos, m, msize);
3233 dropped = GNUNET_NO;
3235 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
3237 send_p2p_message_to_client (sender, cpos, m,
3238 sizeof (struct GNUNET_MessageHeader));
3242 if (dropped == GNUNET_YES)
3245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3246 "Message of type %u from `%4s' not delivered to any client.\n",
3247 (unsigned int) type,
3248 GNUNET_i2s (&sender->peer));
3250 GNUNET_STATISTICS_update (stats,
3251 gettext_noop ("# messages not delivered to any client"),
3258 * We received an encrypted message. Decrypt, validate and
3259 * pass on to the appropriate clients.
3262 handle_encrypted_message (struct Neighbour *n,
3263 const struct EncryptedMessage *m)
3265 size_t size = ntohs (m->header.size);
3267 struct EncryptedMessage *pt; /* plaintext */
3270 struct GNUNET_TIME_Absolute t;
3274 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3275 "Core service receives `%s' request from `%4s'.\n",
3276 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
3278 GNUNET_CRYPTO_hash (&m->iv_seed, sizeof (uint32_t), &iv);
3284 &buf[ENCRYPTED_HEADER_SIZE],
3285 size - ENCRYPTED_HEADER_SIZE))
3287 pt = (struct EncryptedMessage *) buf;
3289 GNUNET_CRYPTO_hmac (&n->decrypt_key,
3290 &pt->sequence_number,
3291 size - ENCRYPTED_HEADER_SIZE - sizeof (GNUNET_HashCode), &ph);
3293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3294 "V-Hashed %u bytes of plaintext (`%s') using IV `%d'\n",
3295 (unsigned int) (size - ENCRYPTED_HEADER_SIZE - sizeof (GNUNET_HashCode)),
3299 if (0 != memcmp (&ph,
3301 sizeof (GNUNET_HashCode)))
3303 /* checksum failed */
3304 GNUNET_break_op (0);
3308 /* validate sequence number */
3309 snum = ntohl (pt->sequence_number);
3310 if (n->last_sequence_number_received == snum)
3312 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3313 "Received duplicate message, ignoring.\n");
3314 /* duplicate, ignore */
3315 GNUNET_STATISTICS_set (stats,
3316 gettext_noop ("# bytes dropped (duplicates)"),
3321 if ((n->last_sequence_number_received > snum) &&
3322 (n->last_sequence_number_received - snum > 32))
3324 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3325 "Received ancient out of sequence message, ignoring.\n");
3326 /* ancient out of sequence, ignore */
3327 GNUNET_STATISTICS_set (stats,
3328 gettext_noop ("# bytes dropped (out of sequence)"),
3333 if (n->last_sequence_number_received > snum)
3335 unsigned int rotbit =
3336 1 << (n->last_sequence_number_received - snum - 1);
3337 if ((n->last_packets_bitmap & rotbit) != 0)
3339 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3340 "Received duplicate message, ignoring.\n");
3341 GNUNET_STATISTICS_set (stats,
3342 gettext_noop ("# bytes dropped (duplicates)"),
3345 /* duplicate, ignore */
3348 n->last_packets_bitmap |= rotbit;
3350 if (n->last_sequence_number_received < snum)
3352 n->last_packets_bitmap <<= (snum - n->last_sequence_number_received);
3353 n->last_sequence_number_received = snum;
3356 /* check timestamp */
3357 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
3358 if (GNUNET_TIME_absolute_get_duration (t).value > MAX_MESSAGE_AGE.value)
3360 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3362 ("Message received far too old (%llu ms). Content ignored.\n"),
3363 GNUNET_TIME_absolute_get_duration (t).value);
3364 GNUNET_STATISTICS_set (stats,
3365 gettext_noop ("# bytes dropped (ancient message)"),
3371 /* process decrypted message(s) */
3372 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
3374 #if DEBUG_CORE_SET_QUOTA
3375 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3376 "Received %u b/s as new inbound limit for peer `%4s'\n",
3377 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
3378 GNUNET_i2s (&n->peer));
3380 n->bw_out_external_limit = pt->inbound_bw_limit;
3381 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3382 n->bw_out_internal_limit);
3383 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3385 GNUNET_TRANSPORT_set_quota (transport,
3389 GNUNET_TIME_UNIT_FOREVER_REL,
3392 n->last_activity = GNUNET_TIME_absolute_get ();
3393 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3394 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3396 = GNUNET_SCHEDULER_add_delayed (sched,
3397 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3400 GNUNET_STATISTICS_set (stats,
3401 gettext_noop ("# bytes of payload decrypted"),
3402 size - sizeof (struct EncryptedMessage),
3404 handle_peer_status_change (n);
3405 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
3407 &buf[sizeof (struct EncryptedMessage)],
3408 size - sizeof (struct EncryptedMessage),
3409 GNUNET_YES, GNUNET_NO))
3410 GNUNET_break_op (0);
3415 * Function called by the transport for each received message.
3417 * @param cls closure
3418 * @param peer (claimed) identity of the other peer
3419 * @param message the message
3420 * @param latency estimated latency for communicating with the
3421 * given peer (round-trip)
3422 * @param distance in overlay hops, as given by transport plugin
3425 handle_transport_receive (void *cls,
3426 const struct GNUNET_PeerIdentity *peer,
3427 const struct GNUNET_MessageHeader *message,
3428 struct GNUNET_TIME_Relative latency,
3429 unsigned int distance)
3431 struct Neighbour *n;
3432 struct GNUNET_TIME_Absolute now;
3439 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3440 "Received message of type %u from `%4s', demultiplexing.\n",
3441 (unsigned int) ntohs (message->type),
3444 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3449 n = find_neighbour (peer);
3451 n = create_neighbour (peer);
3452 changed = (latency.value != n->last_latency.value) || (distance != n->last_distance);
3453 n->last_latency = latency;
3454 n->last_distance = distance;
3455 up = (n->status == PEER_STATE_KEY_CONFIRMED);
3456 type = ntohs (message->type);
3457 size = ntohs (message->size);
3460 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
3461 if (size != sizeof (struct SetKeyMessage))
3463 GNUNET_break_op (0);
3466 GNUNET_STATISTICS_update (stats, gettext_noop ("# session keys received"), 1, GNUNET_NO);
3467 handle_set_key (n, (const struct SetKeyMessage *) message);
3469 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3470 if (size < sizeof (struct EncryptedMessage) +
3471 sizeof (struct GNUNET_MessageHeader))
3473 GNUNET_break_op (0);
3476 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3477 (n->status != PEER_STATE_KEY_CONFIRMED))
3479 GNUNET_break_op (0);
3482 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3484 case GNUNET_MESSAGE_TYPE_CORE_PING:
3485 if (size != sizeof (struct PingMessage))
3487 GNUNET_break_op (0);
3490 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
3491 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3492 (n->status != PEER_STATE_KEY_CONFIRMED))
3495 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3496 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3497 "PING", GNUNET_i2s (&n->peer));
3499 GNUNET_free_non_null (n->pending_ping);
3500 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3501 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3504 handle_ping (n, (const struct PingMessage *) message);
3506 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3507 if (size != sizeof (struct PongMessage))
3509 GNUNET_break_op (0);
3512 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
3513 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3514 (n->status != PEER_STATE_KEY_CONFIRMED) )
3517 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3518 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3519 "PONG", GNUNET_i2s (&n->peer));
3521 GNUNET_free_non_null (n->pending_pong);
3522 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
3523 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
3526 handle_pong (n, (const struct PongMessage *) message);
3529 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3530 _("Unsupported message of type %u received.\n"),
3531 (unsigned int) type);
3534 if (n->status == PEER_STATE_KEY_CONFIRMED)
3536 now = GNUNET_TIME_absolute_get ();
3537 n->last_activity = now;
3538 changed = GNUNET_YES;
3541 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), 1, GNUNET_NO);
3542 n->time_established = now;
3544 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3545 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3547 = GNUNET_SCHEDULER_add_delayed (sched,
3548 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3553 handle_peer_status_change (n);
3558 * Function that recalculates the bandwidth quota for the
3559 * given neighbour and transmits it to the transport service.
3561 * @param cls neighbour for the quota update
3565 neighbour_quota_update (void *cls,
3566 const struct GNUNET_SCHEDULER_TaskContext *tc)
3568 struct Neighbour *n = cls;
3569 struct GNUNET_BANDWIDTH_Value32NBO q_in;
3572 unsigned long long distributable;
3573 uint64_t need_per_peer;
3574 uint64_t need_per_second;
3577 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3578 "Neighbour quota update calculation running for peer `%4s'\n",
3579 GNUNET_i2s (&n->peer));
3581 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
3582 /* calculate relative preference among all neighbours;
3583 divides by a bit more to avoid division by zero AND to
3584 account for possibility of new neighbours joining any time
3585 AND to convert to double... */
3586 if (preference_sum == 0)
3588 pref_rel = 1.0 / (double) neighbour_count;
3592 pref_rel = n->current_preference / preference_sum;
3594 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
3595 GNUNET_TIME_UNIT_SECONDS);
3596 need_per_second = need_per_peer * neighbour_count;
3598 if (bandwidth_target_out_bps > need_per_second)
3599 distributable = bandwidth_target_out_bps - need_per_second;
3600 share = distributable * pref_rel;
3601 if (share + need_per_peer > UINT32_MAX)
3602 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
3604 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
3605 /* check if we want to disconnect for good due to inactivity */
3606 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) &&
3607 (GNUNET_TIME_absolute_get_duration (n->time_established).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) )
3610 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3611 "Forcing disconnect of `%4s' due to inactivity\n",
3612 GNUNET_i2s (&n->peer));
3614 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
3616 #if DEBUG_CORE_QUOTA
3617 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3618 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
3619 GNUNET_i2s (&n->peer),
3620 (unsigned int) ntohl (q_in.value__),
3621 bandwidth_target_out_bps,
3622 (unsigned int) ntohl (n->bw_in.value__),
3623 (unsigned int) ntohl (n->bw_out.value__),
3624 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
3626 if (n->bw_in.value__ != q_in.value__)
3629 if (GNUNET_YES == n->is_connected)
3630 GNUNET_TRANSPORT_set_quota (transport,
3634 GNUNET_TIME_UNIT_FOREVER_REL,
3636 handle_peer_status_change (n);
3638 schedule_quota_update (n);
3643 * Function called by transport to notify us that
3644 * a peer connected to us (on the network level).
3646 * @param cls closure
3647 * @param peer the peer that connected
3648 * @param latency current latency of the connection
3649 * @param distance in overlay hops, as given by transport plugin
3652 handle_transport_notify_connect (void *cls,
3653 const struct GNUNET_PeerIdentity *peer,
3654 struct GNUNET_TIME_Relative latency,
3655 unsigned int distance)
3657 struct Neighbour *n;
3659 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3664 n = find_neighbour (peer);
3667 if (GNUNET_YES == n->is_connected)
3669 /* duplicate connect notification!? */
3676 n = create_neighbour (peer);
3678 GNUNET_STATISTICS_update (stats,
3679 gettext_noop ("# peers connected (transport)"),
3682 n->is_connected = GNUNET_YES;
3683 n->last_latency = latency;
3684 n->last_distance = distance;
3685 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
3688 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
3692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3693 "Received connection from `%4s'.\n",
3694 GNUNET_i2s (&n->peer));
3696 GNUNET_TRANSPORT_set_quota (transport,
3700 GNUNET_TIME_UNIT_FOREVER_REL,
3707 * Function called by transport telling us that a peer
3710 * @param cls closure
3711 * @param peer the peer that disconnected
3714 handle_transport_notify_disconnect (void *cls,
3715 const struct GNUNET_PeerIdentity *peer)
3717 struct DisconnectNotifyMessage cnm;
3718 struct Neighbour *n;
3719 struct GNUNET_TIME_Relative left;
3722 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3723 "Peer `%4s' disconnected from us.\n", GNUNET_i2s (peer));
3725 n = find_neighbour (peer);
3731 GNUNET_break (n->is_connected);
3732 if (n->status == PEER_STATE_KEY_CONFIRMED)
3734 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
3735 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
3737 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
3739 n->is_connected = GNUNET_NO;
3740 GNUNET_STATISTICS_update (stats,
3741 gettext_noop ("# peers connected (transport)"),
3744 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
3745 GNUNET_SCHEDULER_cancel (sched,
3746 n->dead_clean_task);
3747 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3748 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
3749 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
3751 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
3752 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
3753 &consider_free_task,
3759 * Last task run during shutdown. Disconnects us from
3763 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3765 struct Neighbour *n;
3769 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3770 "Core service shutting down.\n");
3772 GNUNET_assert (transport != NULL);
3773 GNUNET_TRANSPORT_disconnect (transport);
3775 while (NULL != (n = neighbours))
3777 neighbours = n->next;
3778 GNUNET_assert (neighbour_count > 0);
3782 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
3783 GNUNET_SERVER_notification_context_destroy (notifier);
3785 while (NULL != (c = clients))
3786 handle_client_disconnect (NULL, c->client_handle);
3787 if (my_private_key != NULL)
3788 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3790 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3791 if (peerinfo != NULL)
3792 GNUNET_PEERINFO_disconnect (peerinfo);
3794 GNUNET_SERVER_mst_destroy (mst);
3799 * Initiate core service.
3801 * @param cls closure
3802 * @param s scheduler to use
3803 * @param server the initialized server
3804 * @param c configuration to use
3808 struct GNUNET_SCHEDULER_Handle *s,
3809 struct GNUNET_SERVER_Handle *server,
3810 const struct GNUNET_CONFIGURATION_Handle *c)
3812 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
3813 {&handle_client_init, NULL,
3814 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
3815 {&handle_client_request_info, NULL,
3816 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
3817 sizeof (struct RequestInfoMessage)},
3818 {&handle_client_send, NULL,
3819 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
3820 {&handle_client_request_connect, NULL,
3821 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
3822 sizeof (struct ConnectMessage)},
3829 /* parse configuration */
3832 GNUNET_CONFIGURATION_get_value_number (c,
3835 &bandwidth_target_in_bps)) ||
3837 GNUNET_CONFIGURATION_get_value_number (c,
3840 &bandwidth_target_out_bps)) ||
3842 GNUNET_CONFIGURATION_get_value_filename (c,
3844 "HOSTKEY", &keyfile)))
3846 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3848 ("Core service is lacking key configuration settings. Exiting.\n"));
3849 GNUNET_SCHEDULER_shutdown (s);
3852 peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
3853 if (NULL == peerinfo)
3855 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3856 _("Could not access PEERINFO service. Exiting.\n"));
3857 GNUNET_SCHEDULER_shutdown (s);
3858 GNUNET_free (keyfile);
3861 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3862 GNUNET_free (keyfile);
3863 if (my_private_key == NULL)
3865 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3866 _("Core service could not access hostkey. Exiting.\n"));
3867 GNUNET_PEERINFO_disconnect (peerinfo);
3868 GNUNET_SCHEDULER_shutdown (s);
3871 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3872 GNUNET_CRYPTO_hash (&my_public_key,
3873 sizeof (my_public_key), &my_identity.hashPubKey);
3874 /* setup notification */
3875 notifier = GNUNET_SERVER_notification_context_create (server,
3877 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
3878 /* setup transport connection */
3879 transport = GNUNET_TRANSPORT_connect (sched,
3883 &handle_transport_receive,
3884 &handle_transport_notify_connect,
3885 &handle_transport_notify_disconnect);
3886 GNUNET_assert (NULL != transport);
3887 stats = GNUNET_STATISTICS_create (sched, "core", cfg);
3888 mst = GNUNET_SERVER_mst_create (&deliver_message,
3890 GNUNET_SCHEDULER_add_delayed (sched,
3891 GNUNET_TIME_UNIT_FOREVER_REL,
3892 &cleaning_task, NULL);
3893 /* process client requests */
3894 GNUNET_SERVER_add_handlers (server, handlers);
3895 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3896 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
3902 * The main function for the transport service.
3904 * @param argc number of arguments from the command line
3905 * @param argv command line arguments
3906 * @return 0 ok, 1 on error
3909 main (int argc, char *const *argv)
3911 return (GNUNET_OK ==
3912 GNUNET_SERVICE_run (argc,
3915 GNUNET_SERVICE_OPTION_NONE,
3916 &run, NULL)) ? 0 : 1;
3919 /* end of gnunet-service-core.c */