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
162 * We've sent our session key.
167 * We've received the other peers session key.
169 PEER_STATE_KEY_RECEIVED,
172 * The other peer has confirmed our session key with a message
173 * encrypted with his session key (which we got). Session is now fully up.
175 PEER_STATE_KEY_CONFIRMED
180 * Encapsulation for encrypted messages exchanged between
181 * peers. Followed by the actual encrypted data.
183 struct EncryptedMessage
186 * Message type is either CORE_ENCRYPTED_MESSAGE.
188 struct GNUNET_MessageHeader header;
191 * Random value used for IV generation.
193 uint32_t iv_seed GNUNET_PACKED;
196 * MAC of the encrypted message (starting at 'sequence_number'),
197 * used to verify message integrity. Everything after this value
198 * (excluding this value itself) will be encrypted and authenticated.
199 * ENCRYPTED_HEADER_SIZE must be set to the offset of the *next* field.
201 GNUNET_HashCode hmac;
204 * Sequence number, in network byte order. This field
205 * must be the first encrypted/decrypted field
207 uint32_t sequence_number GNUNET_PACKED;
210 * Desired bandwidth (how much we should send to this peer / how
211 * much is the sender willing to receive)?
213 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
216 * Timestamp. Used to prevent reply of ancient messages
217 * (recent messages are caught with the sequence number).
219 struct GNUNET_TIME_AbsoluteNBO timestamp;
225 * Number of bytes (at the beginning) of "struct EncryptedMessage"
226 * that are NOT encrypted.
228 #define ENCRYPTED_HEADER_SIZE (offsetof(struct EncryptedMessage, sequence_number))
232 * We're sending an (encrypted) PING to the other peer to check if he
233 * can decrypt. The other peer should respond with a PONG with the
234 * same content, except this time encrypted with the receiver's key.
239 * Message type is CORE_PING.
241 struct GNUNET_MessageHeader header;
246 uint32_t iv_seed GNUNET_PACKED;
249 * Intended target of the PING, used primarily to check
250 * that decryption actually worked.
252 struct GNUNET_PeerIdentity target;
255 * Random number chosen to make reply harder.
257 uint32_t challenge GNUNET_PACKED;
263 * Response to a PING. Includes data from the original PING
264 * plus initial bandwidth quota information.
269 * Message type is CORE_PONG.
271 struct GNUNET_MessageHeader header;
276 uint32_t iv_seed GNUNET_PACKED;
279 * Random number to make faking the reply harder. Must be
280 * first field after header (this is where we start to encrypt!).
282 uint32_t challenge GNUNET_PACKED;
285 * Desired bandwidth (how much we should send to this
286 * peer / how much is the sender willing to receive).
288 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
291 * Intended target of the PING, used primarily to check
292 * that decryption actually worked.
294 struct GNUNET_PeerIdentity target;
299 * Message transmitted to set (or update) a session key.
305 * Message type is either CORE_SET_KEY.
307 struct GNUNET_MessageHeader header;
310 * Status of the sender (should be in "enum PeerStateMachine"), nbo.
312 int32_t sender_status GNUNET_PACKED;
315 * Purpose of the signature, will be
316 * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
318 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
321 * At what time was this key created?
323 struct GNUNET_TIME_AbsoluteNBO creation_time;
326 * The encrypted session key.
328 struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
331 * Who is the intended recipient?
333 struct GNUNET_PeerIdentity target;
336 * Signature of the stuff above (starting at purpose).
338 struct GNUNET_CRYPTO_RsaSignature signature;
344 * Message waiting for transmission. This struct
345 * is followed by the actual content of the message.
351 * We keep messages in a doubly linked list.
353 struct MessageEntry *next;
356 * We keep messages in a doubly linked list.
358 struct MessageEntry *prev;
361 * By when are we supposed to transmit this message?
363 struct GNUNET_TIME_Absolute deadline;
366 * By when are we supposed to transmit this message (after
369 struct GNUNET_TIME_Absolute slack_deadline;
372 * How important is this message to us?
374 unsigned int priority;
377 * If this is a SET_KEY message, what was our connection status when this
378 * message was queued?
380 enum PeerStateMachine sender_status;
383 * Is this a SET_KEY message?
388 * How long is the message? (number of bytes following
389 * the "struct MessageEntry", but not including the
390 * size of "struct MessageEntry" itself!)
395 * Was this message selected for transmission in the
396 * current round? GNUNET_YES or GNUNET_NO.
401 * Did we give this message some slack (delayed sending) previously
402 * (and hence should not give it any more slack)? GNUNET_YES or
411 * Record kept for each request for transmission issued by a
412 * client that is still pending.
414 struct ClientActiveRequest;
417 * Data kept per neighbouring peer.
423 * Unencrypted messages destined for this peer.
425 struct MessageEntry *messages;
428 * Head of the batched, encrypted message queue (already ordered,
429 * transmit starting with the head).
431 struct MessageEntry *encrypted_head;
434 * Tail of the batched, encrypted message queue (already ordered,
435 * append new messages to tail)
437 struct MessageEntry *encrypted_tail;
440 * Head of list of requests from clients for transmission to
443 struct ClientActiveRequest *active_client_request_head;
446 * Tail of list of requests from clients for transmission to
449 struct ClientActiveRequest *active_client_request_tail;
452 * Handle for pending requests for transmission to this peer
453 * with the transport service. NULL if no request is pending.
455 struct GNUNET_TRANSPORT_TransmitHandle *th;
458 * Public key of the neighbour, NULL if we don't have it yet.
460 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
463 * We received a PING message before we got the "public_key"
464 * (or the SET_KEY). We keep it here until we have a key
465 * to decrypt it. NULL if no PING is pending.
467 struct PingMessage *pending_ping;
470 * We received a PONG message before we got the "public_key"
471 * (or the SET_KEY). We keep it here until we have a key
472 * to decrypt it. NULL if no PONG is pending.
474 struct PongMessage *pending_pong;
477 * Non-NULL if we are currently looking up HELLOs for this peer.
480 struct GNUNET_PEERINFO_IteratorContext *pitr;
483 * SetKeyMessage to transmit, NULL if we are not currently trying
486 struct SetKeyMessage *skm;
489 * Performance data for the peer.
491 struct GNUNET_TRANSPORT_ATS_Information *ats;
494 * Identity of the neighbour.
496 struct GNUNET_PeerIdentity peer;
499 * Key we use to encrypt our messages for the other peer
500 * (initialized by us when we do the handshake).
502 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
505 * Key we use to decrypt messages from the other peer
506 * (given to us by the other peer during the handshake).
508 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
511 * ID of task used for re-trying plaintext scheduling.
513 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
516 * ID of task used for re-trying SET_KEY and PING message.
518 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
521 * ID of task used for updating bandwidth quota for this neighbour.
523 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
526 * ID of task used for sending keep-alive pings.
528 GNUNET_SCHEDULER_TaskIdentifier keep_alive_task;
531 * ID of task used for cleaning up dead neighbour entries.
533 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
536 * At what time did we generate our encryption key?
538 struct GNUNET_TIME_Absolute encrypt_key_created;
541 * At what time did the other peer generate the decryption key?
543 struct GNUNET_TIME_Absolute decrypt_key_created;
546 * At what time did we initially establish (as in, complete session
547 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
549 struct GNUNET_TIME_Absolute time_established;
552 * At what time did we last receive an encrypted message from the
553 * other peer? Should be zero if status != KEY_CONFIRMED.
555 struct GNUNET_TIME_Absolute last_activity;
558 * At what frequency are we currently re-trying SET_KEY messages?
560 struct GNUNET_TIME_Relative set_key_retry_frequency;
563 * Tracking bandwidth for sending to this peer.
565 struct GNUNET_BANDWIDTH_Tracker available_send_window;
568 * Tracking bandwidth for receiving from this peer.
570 struct GNUNET_BANDWIDTH_Tracker available_recv_window;
573 * How valueable were the messages of this peer recently?
575 unsigned long long current_preference;
578 * Number of entries in 'ats'.
580 unsigned int ats_count;
583 * Bit map indicating which of the 32 sequence numbers before the last
584 * were received (good for accepting out-of-order packets and
585 * estimating reliability of the connection)
587 unsigned int last_packets_bitmap;
590 * last sequence number received on this connection (highest)
592 uint32_t last_sequence_number_received;
595 * last sequence number transmitted
597 uint32_t last_sequence_number_sent;
600 * Available bandwidth in for this peer (current target).
602 struct GNUNET_BANDWIDTH_Value32NBO bw_in;
605 * Available bandwidth out for this peer (current target).
607 struct GNUNET_BANDWIDTH_Value32NBO bw_out;
610 * Internal bandwidth limit set for this peer (initially typically
611 * set to "-1"). Actual "bw_out" is MIN of
612 * "bpm_out_internal_limit" and "bw_out_external_limit".
614 struct GNUNET_BANDWIDTH_Value32NBO bw_out_internal_limit;
617 * External bandwidth limit set for this peer by the
618 * peer that we are communicating with. "bw_out" is MIN of
619 * "bw_out_internal_limit" and "bw_out_external_limit".
621 struct GNUNET_BANDWIDTH_Value32NBO bw_out_external_limit;
624 * What was our PING challenge number (for this peer)?
626 uint32_t ping_challenge;
629 * What is our connection status?
631 enum PeerStateMachine status;
634 * Are we currently connected to this neighbour?
642 * Data structure for each client connected to the core service.
647 * Clients are kept in a linked list.
652 * Handle for the client with the server API.
654 struct GNUNET_SERVER_Client *client_handle;
657 * Array of the types of messages this peer cares
658 * about (with "tcnt" entries). Allocated as part
659 * of this client struct, do not free!
661 const uint16_t *types;
664 * Map of peer identities to active transmission requests of this
665 * client to the peer (of type 'struct ClientActiveRequest').
667 struct GNUNET_CONTAINER_MultiHashMap *requests;
670 * Options for messages this client cares about,
671 * see GNUNET_CORE_OPTION_ values.
676 * Number of types of incoming messages this client
677 * specifically cares about. Size of the "types" array.
685 * Record kept for each request for transmission issued by a
686 * client that is still pending.
688 struct ClientActiveRequest
692 * Active requests are kept in a doubly-linked list of
693 * the respective target peer.
695 struct ClientActiveRequest *next;
698 * Active requests are kept in a doubly-linked list of
699 * the respective target peer.
701 struct ClientActiveRequest *prev;
704 * Handle to the client.
706 struct Client *client;
709 * By what time would the client want to see this message out?
711 struct GNUNET_TIME_Absolute deadline;
714 * How important is this request.
719 * How many more requests does this client have?
724 * How many bytes does the client intend to send?
729 * Unique request ID (in big endian).
740 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
745 static struct GNUNET_PeerIdentity my_identity;
750 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
754 * Handle to peerinfo service.
756 static struct GNUNET_PEERINFO_Handle *peerinfo;
759 * Our message stream tokenizer (for encrypted payload).
761 static struct GNUNET_SERVER_MessageStreamTokenizer *mst;
766 const struct GNUNET_CONFIGURATION_Handle *cfg;
771 static struct GNUNET_TRANSPORT_Handle *transport;
774 * Linked list of our clients.
776 static struct Client *clients;
779 * Context for notifications we need to send to our clients.
781 static struct GNUNET_SERVER_NotificationContext *notifier;
784 * Map of peer identities to 'struct Neighbour'.
786 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
789 * Neighbour entry for "this" peer.
791 static struct Neighbour self;
794 * For creating statistics.
796 static struct GNUNET_STATISTICS_Handle *stats;
799 * Sum of all preferences among all neighbours.
801 static unsigned long long preference_sum;
804 * How much inbound bandwidth are we supposed to be using per second?
806 static unsigned long long bandwidth_target_in_bps;
809 * How much outbound bandwidth are we supposed to be using per second?
811 static unsigned long long bandwidth_target_out_bps;
814 * Derive an authentication key from "set key" information
817 derive_auth_key (struct GNUNET_CRYPTO_AuthKey *akey,
818 const struct GNUNET_CRYPTO_AesSessionKey *skey,
820 struct GNUNET_TIME_Absolute creation_time)
822 static const char ctx[] = "authentication key";
823 struct GNUNET_TIME_AbsoluteNBO ctbe;
826 ctbe = GNUNET_TIME_absolute_hton (creation_time);
827 GNUNET_CRYPTO_hmac_derive_key (akey,
841 * Derive an IV from packet information
844 derive_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
845 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
846 const struct GNUNET_PeerIdentity *identity)
848 static const char ctx[] = "initialization vector";
850 GNUNET_CRYPTO_aes_derive_iv (iv,
854 &identity->hashPubKey.bits,
855 sizeof(identity->hashPubKey.bits),
861 * Derive an IV from pong packet information
864 derive_pong_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
865 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
866 uint32_t challenge, const struct GNUNET_PeerIdentity *identity)
868 static const char ctx[] = "pong initialization vector";
870 GNUNET_CRYPTO_aes_derive_iv (iv,
874 &identity->hashPubKey.bits,
875 sizeof(identity->hashPubKey.bits),
884 * At what time should the connection to the given neighbour
885 * time out (given no further activity?)
887 * @param n neighbour in question
888 * @return absolute timeout
890 static struct GNUNET_TIME_Absolute
891 get_neighbour_timeout (struct Neighbour *n)
893 return GNUNET_TIME_absolute_add (n->last_activity,
894 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
899 * Helper function for update_preference_sum.
902 update_preference (void *cls,
903 const GNUNET_HashCode *key,
906 unsigned long long *ps = cls;
907 struct Neighbour *n = value;
909 n->current_preference /= 2;
910 *ps += n->current_preference;
916 * A preference value for a neighbour was update. Update
917 * the preference sum accordingly.
919 * @param inc how much was a preference value increased?
922 update_preference_sum (unsigned long long inc)
924 unsigned long long os;
927 preference_sum += inc;
928 if (preference_sum >= os)
930 /* overflow! compensate by cutting all values in half! */
932 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
935 GNUNET_STATISTICS_set (stats, gettext_noop ("# total peer preference"), preference_sum, GNUNET_NO);
940 * Find the entry for the given neighbour.
942 * @param peer identity of the neighbour
943 * @return NULL if we are not connected, otherwise the
946 static struct Neighbour *
947 find_neighbour (const struct GNUNET_PeerIdentity *peer)
949 return GNUNET_CONTAINER_multihashmap_get (neighbours, &peer->hashPubKey);
954 * Send a message to one of our clients.
956 * @param client target for the message
957 * @param msg message to transmit
958 * @param can_drop could this message be dropped if the
959 * client's queue is getting too large?
962 send_to_client (struct Client *client,
963 const struct GNUNET_MessageHeader *msg,
966 #if DEBUG_CORE_CLIENT
967 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
968 "Preparing to send %u bytes of message of type %u to client.\n",
969 (unsigned int) ntohs (msg->size),
970 (unsigned int) ntohs (msg->type));
972 GNUNET_SERVER_notification_context_unicast (notifier,
973 client->client_handle,
980 * Send a message to all of our current clients that have
981 * the right options set.
983 * @param msg message to multicast
984 * @param can_drop can this message be discarded if the queue is too long
985 * @param options mask to use
988 send_to_all_clients (const struct GNUNET_MessageHeader *msg,
997 if (0 != (c->options & options))
999 #if DEBUG_CORE_CLIENT
1000 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1001 "Sending message of type %u to client.\n",
1002 (unsigned int) ntohs (msg->type));
1004 send_to_client (c, msg, can_drop);
1012 * Function called by transport telling us that a peer
1015 * @param n the peer that changed status
1018 handle_peer_status_change (struct Neighbour *n)
1020 struct PeerStatusNotifyMessage *psnm;
1021 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1022 struct GNUNET_TRANSPORT_ATS_Information *ats;
1025 if ( (! n->is_connected) ||
1026 (n->status != PEER_STATE_KEY_CONFIRMED) )
1029 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1030 "Peer `%4s' changed status\n",
1031 GNUNET_i2s (&n->peer));
1033 size = sizeof (struct PeerStatusNotifyMessage) +
1034 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1035 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1038 /* recovery strategy: throw away performance data */
1039 GNUNET_array_grow (n->ats,
1042 size = sizeof (struct PeerStatusNotifyMessage) +
1043 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1045 psnm = (struct PeerStatusNotifyMessage*) buf;
1046 psnm->header.size = htons (size);
1047 psnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE);
1048 psnm->timeout = GNUNET_TIME_absolute_hton (get_neighbour_timeout (n));
1049 psnm->bandwidth_in = n->bw_in;
1050 psnm->bandwidth_out = n->bw_out;
1051 psnm->peer = n->peer;
1052 psnm->ats_count = htonl (n->ats_count);
1056 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
1057 ats[n->ats_count].type = htonl (0);
1058 ats[n->ats_count].value = htonl (0);
1059 send_to_all_clients (&psnm->header,
1061 GNUNET_CORE_OPTION_SEND_STATUS_CHANGE);
1062 GNUNET_STATISTICS_update (stats,
1063 gettext_noop ("# peer status changes"),
1070 * Go over our message queue and if it is not too long, go
1071 * over the pending requests from clients for this
1072 * neighbour and send some clients a 'READY' notification.
1074 * @param n which peer to process
1077 schedule_peer_messages (struct Neighbour *n)
1079 struct SendMessageReady smr;
1080 struct ClientActiveRequest *car;
1081 struct ClientActiveRequest *pos;
1083 struct MessageEntry *mqe;
1084 unsigned int queue_size;
1086 /* check if neighbour queue is empty enough! */
1096 if (queue_size >= MAX_PEER_QUEUE_SIZE)
1098 #if DEBUG_CORE_CLIENT
1099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1100 "Not considering client transmission requests: queue full\n");
1102 return; /* queue still full */
1104 /* find highest priority request */
1105 pos = n->active_client_request_head;
1109 if ( (car == NULL) ||
1110 (pos->priority > car->priority) )
1117 car = n->active_client_request_head;
1120 return; /* no pending requests */
1121 #if DEBUG_CORE_CLIENT
1122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1123 "Permitting client transmission request to `%s'\n",
1124 GNUNET_i2s (&n->peer));
1127 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1128 n->active_client_request_tail,
1130 GNUNET_assert (GNUNET_YES ==
1131 GNUNET_CONTAINER_multihashmap_remove (c->requests,
1132 &n->peer.hashPubKey,
1134 smr.header.size = htons (sizeof (struct SendMessageReady));
1135 smr.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_READY);
1136 smr.size = htons (car->msize);
1137 smr.smr_id = car->smr_id;
1139 send_to_client (c, &smr.header, GNUNET_NO);
1145 * Handle CORE_SEND_REQUEST message.
1148 handle_client_send_request (void *cls,
1149 struct GNUNET_SERVER_Client *client,
1150 const struct GNUNET_MessageHeader *message)
1152 const struct SendMessageRequest *req;
1153 struct Neighbour *n;
1155 struct ClientActiveRequest *car;
1157 req = (const struct SendMessageRequest*) message;
1158 if (0 == memcmp (&req->peer,
1160 sizeof (struct GNUNET_PeerIdentity)))
1163 n = find_neighbour (&req->peer);
1165 (GNUNET_YES != n->is_connected) ||
1166 (n->status != PEER_STATE_KEY_CONFIRMED) )
1168 /* neighbour must have disconnected since request was issued,
1169 ignore (client will realize it once it processes the
1170 disconnect notification) */
1171 #if DEBUG_CORE_CLIENT
1172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1173 "Dropped client request for transmission (am disconnected)\n");
1175 GNUNET_STATISTICS_update (stats,
1176 gettext_noop ("# send requests dropped (disconnected)"),
1179 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1183 while ( (c != NULL) &&
1184 (c->client_handle != client) )
1188 /* client did not send INIT first! */
1190 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1193 if (c->requests == NULL)
1194 c->requests = GNUNET_CONTAINER_multihashmap_create (16);
1195 #if DEBUG_CORE_CLIENT
1196 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1197 "Received client transmission request. queueing\n");
1199 car = GNUNET_CONTAINER_multihashmap_get (c->requests,
1200 &req->peer.hashPubKey);
1203 /* create new entry */
1204 car = GNUNET_malloc (sizeof (struct ClientActiveRequest));
1205 GNUNET_assert (GNUNET_OK ==
1206 GNUNET_CONTAINER_multihashmap_put (c->requests,
1207 &req->peer.hashPubKey,
1209 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
1210 GNUNET_CONTAINER_DLL_insert (n->active_client_request_head,
1211 n->active_client_request_tail,
1215 car->deadline = GNUNET_TIME_absolute_ntoh (req->deadline);
1216 car->priority = ntohl (req->priority);
1217 car->queue_size = ntohl (req->queue_size);
1218 car->msize = ntohs (req->size);
1219 car->smr_id = req->smr_id;
1220 schedule_peer_messages (n);
1221 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1226 * Notify client about an existing connection to one of our neighbours.
1229 notify_client_about_neighbour (void *cls,
1230 const GNUNET_HashCode *key,
1233 struct Client *c = cls;
1234 struct Neighbour *n = value;
1236 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1237 struct GNUNET_TRANSPORT_ATS_Information *ats;
1238 struct ConnectNotifyMessage *cnm;
1240 size = sizeof (struct ConnectNotifyMessage) +
1241 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1242 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1245 /* recovery strategy: throw away performance data */
1246 GNUNET_array_grow (n->ats,
1249 size = sizeof (struct ConnectNotifyMessage) +
1250 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1252 cnm = (struct ConnectNotifyMessage*) buf;
1253 cnm->header.size = htons (size);
1254 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1255 cnm->ats_count = htonl (n->ats_count);
1259 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * n->ats_count);
1260 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1261 ats[n->ats_count].value = htonl (0);
1262 if (n->status == PEER_STATE_KEY_CONFIRMED)
1264 #if DEBUG_CORE_CLIENT
1265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1266 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
1268 cnm->peer = n->peer;
1269 send_to_client (c, &cnm->header, GNUNET_NO);
1277 * Handle CORE_INIT request.
1280 handle_client_init (void *cls,
1281 struct GNUNET_SERVER_Client *client,
1282 const struct GNUNET_MessageHeader *message)
1284 const struct InitMessage *im;
1285 struct InitReplyMessage irm;
1288 const uint16_t *types;
1292 #if DEBUG_CORE_CLIENT
1293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1294 "Client connecting to core service with `%s' message\n",
1297 /* check that we don't have an entry already */
1301 if (client == c->client_handle)
1304 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1309 msize = ntohs (message->size);
1310 if (msize < sizeof (struct InitMessage))
1313 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1316 GNUNET_SERVER_notification_context_add (notifier, client);
1317 im = (const struct InitMessage *) message;
1318 types = (const uint16_t *) &im[1];
1319 msize -= sizeof (struct InitMessage);
1320 c = GNUNET_malloc (sizeof (struct Client) + msize);
1321 c->client_handle = client;
1324 c->tcnt = msize / sizeof (uint16_t);
1325 c->types = (const uint16_t *) &c[1];
1326 wtypes = (uint16_t *) &c[1];
1327 for (i=0;i<c->tcnt;i++)
1328 wtypes[i] = ntohs (types[i]);
1329 c->options = ntohl (im->options);
1330 #if DEBUG_CORE_CLIENT
1331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1332 "Client %p is interested in %u message types\n",
1334 (unsigned int) c->tcnt);
1336 /* send init reply message */
1337 irm.header.size = htons (sizeof (struct InitReplyMessage));
1338 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
1339 irm.reserved = htonl (0);
1340 memcpy (&irm.publicKey,
1342 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1343 #if DEBUG_CORE_CLIENT
1344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1345 "Sending `%s' message to client.\n", "INIT_REPLY");
1347 send_to_client (c, &irm.header, GNUNET_NO);
1348 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
1350 /* notify new client about existing neighbours */
1351 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
1352 ¬ify_client_about_neighbour,
1355 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1360 * Free client request records.
1363 * @param key identity of peer for which this is an active request
1364 * @param value the 'struct ClientActiveRequest' to free
1365 * @return GNUNET_YES (continue iteration)
1368 destroy_active_client_request (void *cls,
1369 const GNUNET_HashCode *key,
1372 struct ClientActiveRequest *car = value;
1373 struct Neighbour *n;
1374 struct GNUNET_PeerIdentity peer;
1376 peer.hashPubKey = *key;
1377 n = find_neighbour (&peer);
1378 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1379 n->active_client_request_tail,
1387 * A client disconnected, clean up.
1389 * @param cls closure
1390 * @param client identification of the client
1393 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
1396 struct Client *prev;
1400 #if DEBUG_CORE_CLIENT
1401 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1402 "Client %p has disconnected from core service.\n",
1409 if (client == pos->client_handle)
1416 /* client never sent INIT */
1420 clients = pos->next;
1422 prev->next = pos->next;
1423 if (pos->requests != NULL)
1425 GNUNET_CONTAINER_multihashmap_iterate (pos->requests,
1426 &destroy_active_client_request,
1428 GNUNET_CONTAINER_multihashmap_destroy (pos->requests);
1435 * Helper function for handle_client_iterate_peers.
1438 queue_connect_message (void *cls,
1439 const GNUNET_HashCode *key,
1442 struct GNUNET_SERVER_TransmitContext *tc = cls;
1443 struct Neighbour *n = value;
1444 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1445 struct GNUNET_TRANSPORT_ATS_Information *ats;
1447 struct ConnectNotifyMessage *cnm;
1449 cnm = (struct ConnectNotifyMessage*) buf;
1450 if (n->status != PEER_STATE_KEY_CONFIRMED)
1452 size = sizeof (struct ConnectNotifyMessage) +
1453 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1454 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1457 /* recovery strategy: throw away performance data */
1458 GNUNET_array_grow (n->ats,
1461 size = sizeof (struct PeerStatusNotifyMessage) +
1462 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1464 cnm = (struct ConnectNotifyMessage*) buf;
1465 cnm->header.size = htons (size);
1466 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1467 cnm->ats_count = htonl (n->ats_count);
1471 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
1472 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1473 ats[n->ats_count].value = htonl (0);
1474 #if DEBUG_CORE_CLIENT
1475 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1476 "Sending `%s' message to client.\n",
1479 cnm->peer = n->peer;
1480 GNUNET_SERVER_transmit_context_append_message (tc,
1487 * Handle CORE_ITERATE_PEERS request.
1490 * @param client client sending the iteration request
1491 * @param message iteration request message
1494 handle_client_iterate_peers (void *cls,
1495 struct GNUNET_SERVER_Client *client,
1496 const struct GNUNET_MessageHeader *message)
1499 struct GNUNET_MessageHeader done_msg;
1500 struct GNUNET_SERVER_TransmitContext *tc;
1502 /* notify new client about existing neighbours */
1504 msize = ntohs(message->size);
1505 tc = GNUNET_SERVER_transmit_context_create (client);
1506 if (msize == sizeof(struct GNUNET_MessageHeader))
1507 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &queue_connect_message, tc);
1511 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1512 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
1513 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
1514 GNUNET_SERVER_transmit_context_run (tc,
1515 GNUNET_TIME_UNIT_FOREVER_REL);
1519 * Handle CORE_ITERATE_PEERS request.
1522 * @param client client sending the iteration request
1523 * @param message iteration request message
1526 handle_client_have_peer (void *cls,
1527 struct GNUNET_SERVER_Client *client,
1528 const struct GNUNET_MessageHeader *message)
1531 struct GNUNET_MessageHeader done_msg;
1532 struct GNUNET_SERVER_TransmitContext *tc;
1533 struct GNUNET_PeerIdentity *peer;
1535 /* notify new client about existing neighbours */
1537 msize = ntohs(message->size);
1538 tc = GNUNET_SERVER_transmit_context_create (client);
1540 peer = (struct GNUNET_PeerIdentity *)&message[1];
1541 GNUNET_CONTAINER_multihashmap_get_multiple(neighbours, &peer->hashPubKey, &queue_connect_message, tc);
1543 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1544 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
1545 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
1546 GNUNET_SERVER_transmit_context_run (tc,
1547 GNUNET_TIME_UNIT_FOREVER_REL);
1552 * Handle REQUEST_INFO request.
1555 handle_client_request_info (void *cls,
1556 struct GNUNET_SERVER_Client *client,
1557 const struct GNUNET_MessageHeader *message)
1559 const struct RequestInfoMessage *rcm;
1561 struct Neighbour *n;
1562 struct ConfigurationInfoMessage cim;
1563 int32_t want_reserv;
1565 unsigned long long old_preference;
1567 #if DEBUG_CORE_CLIENT
1568 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1569 "Core service receives `%s' request.\n", "REQUEST_INFO");
1574 if (client == pos->client_handle)
1581 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1585 rcm = (const struct RequestInfoMessage *) message;
1586 n = find_neighbour (&rcm->peer);
1587 memset (&cim, 0, sizeof (cim));
1590 want_reserv = ntohl (rcm->reserve_inbound);
1591 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1593 n->bw_out_internal_limit = rcm->limit_outbound;
1594 if (n->bw_out.value__ != GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1595 n->bw_out_external_limit).value__)
1597 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1598 n->bw_out_external_limit);
1599 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1601 GNUNET_TRANSPORT_set_quota (transport,
1605 GNUNET_TIME_UNIT_FOREVER_REL,
1607 handle_peer_status_change (n);
1610 if (want_reserv < 0)
1612 got_reserv = want_reserv;
1614 else if (want_reserv > 0)
1616 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1617 want_reserv).rel_value == 0)
1618 got_reserv = want_reserv;
1620 got_reserv = 0; /* all or nothing */
1624 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1626 old_preference = n->current_preference;
1627 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1628 if (old_preference > n->current_preference)
1630 /* overflow; cap at maximum value */
1631 n->current_preference = ULLONG_MAX;
1633 update_preference_sum (n->current_preference - old_preference);
1634 #if DEBUG_CORE_QUOTA
1635 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1636 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1638 GNUNET_i2s (&rcm->peer),
1641 cim.reserved_amount = htonl (got_reserv);
1642 cim.rim_id = rcm->rim_id;
1643 cim.bw_out = n->bw_out;
1644 cim.preference = n->current_preference;
1646 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1647 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1648 cim.peer = rcm->peer;
1649 #if DEBUG_CORE_CLIENT
1650 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1651 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1653 send_to_client (pos, &cim.header, GNUNET_NO);
1654 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1659 * Free the given entry for the neighbour (it has
1660 * already been removed from the list at this point).
1662 * @param n neighbour to free
1665 free_neighbour (struct Neighbour *n)
1667 struct MessageEntry *m;
1668 struct ClientActiveRequest *car;
1671 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1672 "Destroying neighbour entry for peer `%4s'\n",
1673 GNUNET_i2s (&n->peer));
1675 if (n->pitr != NULL)
1677 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1682 GNUNET_free (n->skm);
1685 while (NULL != (m = n->messages))
1687 n->messages = m->next;
1690 while (NULL != (m = n->encrypted_head))
1692 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1697 while (NULL != (car = n->active_client_request_head))
1699 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1700 n->active_client_request_tail,
1702 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
1703 &n->peer.hashPubKey,
1709 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1712 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1713 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
1714 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1715 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
1716 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1717 GNUNET_SCHEDULER_cancel (n->quota_update_task);
1718 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1719 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1720 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1721 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
1722 if (n->status == PEER_STATE_KEY_CONFIRMED)
1723 GNUNET_STATISTICS_update (stats,
1724 gettext_noop ("# established sessions"),
1727 GNUNET_array_grow (n->ats, n->ats_count, 0);
1728 GNUNET_free_non_null (n->public_key);
1729 GNUNET_free_non_null (n->pending_ping);
1730 GNUNET_free_non_null (n->pending_pong);
1736 * Check if we have encrypted messages for the specified neighbour
1737 * pending, and if so, check with the transport about sending them
1740 * @param n neighbour to check.
1742 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1746 * Encrypt size bytes from in and write the result to out. Use the
1747 * key for outbound traffic of the given neighbour.
1749 * @param n neighbour we are sending to
1750 * @param iv initialization vector to use
1751 * @param in ciphertext
1752 * @param out plaintext
1753 * @param size size of in/out
1754 * @return GNUNET_OK on success
1757 do_encrypt (struct Neighbour *n,
1758 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1759 const void *in, void *out, size_t size)
1761 if (size != (uint16_t) size)
1766 GNUNET_assert (size ==
1767 GNUNET_CRYPTO_aes_encrypt (in,
1771 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1774 "Encrypted %u bytes for `%4s' using key %u, IV %u\n",
1775 (unsigned int) size,
1776 GNUNET_i2s (&n->peer),
1777 (unsigned int) n->encrypt_key.crc32,
1778 GNUNET_CRYPTO_crc32_n (iv, sizeof(iv)));
1785 * Consider freeing the given neighbour since we may not need
1786 * to keep it around anymore.
1788 * @param n neighbour to consider discarding
1791 consider_free_neighbour (struct Neighbour *n);
1795 * Task triggered when a neighbour entry is about to time out
1796 * (and we should prevent this by sending a PING).
1798 * @param cls the 'struct Neighbour'
1799 * @param tc scheduler context (not used)
1802 send_keep_alive (void *cls,
1803 const struct GNUNET_SCHEDULER_TaskContext *tc)
1805 struct Neighbour *n = cls;
1806 struct GNUNET_TIME_Relative retry;
1807 struct GNUNET_TIME_Relative left;
1808 struct MessageEntry *me;
1809 struct PingMessage pp;
1810 struct PingMessage *pm;
1811 struct GNUNET_CRYPTO_AesInitializationVector iv;
1813 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1815 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1816 sizeof (struct PingMessage));
1817 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1818 me->priority = PING_PRIORITY;
1819 me->size = sizeof (struct PingMessage);
1820 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1824 pm = (struct PingMessage *) &me[1];
1825 pm->header.size = htons (sizeof (struct PingMessage));
1826 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1827 pm->iv_seed = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1829 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
1830 pp.challenge = n->ping_challenge;
1831 pp.target = n->peer;
1833 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1834 "Encrypting `%s' message with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
1836 (unsigned int) n->ping_challenge,
1837 GNUNET_i2s (&n->peer),
1838 (unsigned int) n->encrypt_key.crc32,
1839 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
1846 sizeof (struct PingMessage) -
1847 ((void *) &pm->target - (void *) pm));
1848 process_encrypted_neighbour_queue (n);
1849 /* reschedule PING job */
1850 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1851 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1852 MIN_PING_FREQUENCY);
1854 = GNUNET_SCHEDULER_add_delayed (retry,
1862 * Task triggered when a neighbour entry might have gotten stale.
1864 * @param cls the 'struct Neighbour'
1865 * @param tc scheduler context (not used)
1868 consider_free_task (void *cls,
1869 const struct GNUNET_SCHEDULER_TaskContext *tc)
1871 struct Neighbour *n = cls;
1873 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1874 consider_free_neighbour (n);
1879 * Consider freeing the given neighbour since we may not need
1880 * to keep it around anymore.
1882 * @param n neighbour to consider discarding
1885 consider_free_neighbour (struct Neighbour *n)
1887 struct GNUNET_TIME_Relative left;
1889 if ( (n->th != NULL) ||
1890 (n->pitr != NULL) ||
1891 (GNUNET_YES == n->is_connected) )
1892 return; /* no chance */
1894 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1895 if (left.rel_value > 0)
1897 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1898 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1899 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (left,
1900 &consider_free_task,
1904 /* actually free the neighbour... */
1905 GNUNET_assert (GNUNET_OK ==
1906 GNUNET_CONTAINER_multihashmap_remove (neighbours,
1907 &n->peer.hashPubKey,
1909 GNUNET_STATISTICS_set (stats,
1910 gettext_noop ("# neighbour entries allocated"),
1911 GNUNET_CONTAINER_multihashmap_size (neighbours),
1918 * Function called when the transport service is ready to
1919 * receive an encrypted message for the respective peer
1921 * @param cls neighbour to use message from
1922 * @param size number of bytes we can transmit
1923 * @param buf where to copy the message
1924 * @return number of bytes transmitted
1927 notify_encrypted_transmit_ready (void *cls,
1931 struct Neighbour *n = cls;
1932 struct MessageEntry *m;
1937 m = n->encrypted_head;
1941 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1942 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1943 GNUNET_i2s (&n->peer));
1947 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1954 GNUNET_assert (size >= m->size);
1955 memcpy (cbuf, &m[1], m->size);
1957 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1960 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1961 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1962 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1964 GNUNET_i2s (&n->peer));
1966 process_encrypted_neighbour_queue (n);
1971 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1972 "Transmission of message of type %u and size %u failed\n",
1973 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1974 (unsigned int) m->size);
1978 consider_free_neighbour (n);
1979 GNUNET_STATISTICS_update (stats,
1980 gettext_noop ("# encrypted bytes given to transport"),
1988 * Check if we have plaintext messages for the specified neighbour
1989 * pending, and if so, consider batching and encrypting them (and
1990 * then trigger processing of the encrypted queue if needed).
1992 * @param n neighbour to check.
1994 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1998 * Check if we have encrypted messages for the specified neighbour
1999 * pending, and if so, check with the transport about sending them
2002 * @param n neighbour to check.
2005 process_encrypted_neighbour_queue (struct Neighbour *n)
2007 struct MessageEntry *m;
2010 return; /* request already pending */
2011 m = n->encrypted_head;
2014 /* encrypted queue empty, try plaintext instead */
2015 process_plaintext_neighbour_queue (n);
2019 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2020 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
2021 (unsigned int) m->size,
2022 GNUNET_i2s (&n->peer),
2023 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
2026 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
2029 GNUNET_TIME_absolute_get_remaining
2031 ¬ify_encrypted_transmit_ready,
2035 /* message request too large or duplicate request */
2037 /* discard encrypted message */
2038 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
2042 process_encrypted_neighbour_queue (n);
2048 * Decrypt size bytes from in and write the result to out. Use the
2049 * key for inbound traffic of the given neighbour. This function does
2050 * NOT do any integrity-checks on the result.
2052 * @param n neighbour we are receiving from
2053 * @param iv initialization vector to use
2054 * @param in ciphertext
2055 * @param out plaintext
2056 * @param size size of in/out
2057 * @return GNUNET_OK on success
2060 do_decrypt (struct Neighbour *n,
2061 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
2062 const void *in, void *out, size_t size)
2064 if (size != (uint16_t) size)
2069 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
2070 (n->status != PEER_STATE_KEY_CONFIRMED))
2072 GNUNET_break_op (0);
2073 return GNUNET_SYSERR;
2076 GNUNET_CRYPTO_aes_decrypt (in,
2083 return GNUNET_SYSERR;
2085 GNUNET_STATISTICS_update (stats,
2086 gettext_noop ("# bytes decrypted"),
2090 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2091 "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
2092 (unsigned int) size,
2093 GNUNET_i2s (&n->peer),
2094 (unsigned int) n->decrypt_key.crc32,
2095 GNUNET_CRYPTO_crc32_n (iv, sizeof(*iv)));
2102 * Select messages for transmission. This heuristic uses a combination
2103 * of earliest deadline first (EDF) scheduling (with bounded horizon)
2104 * and priority-based discard (in case no feasible schedule exist) and
2105 * speculative optimization (defer any kind of transmission until
2106 * we either create a batch of significant size, 25% of max, or until
2107 * we are close to a deadline). Furthermore, when scheduling the
2108 * heuristic also packs as many messages into the batch as possible,
2109 * starting with those with the earliest deadline. Yes, this is fun.
2111 * @param n neighbour to select messages from
2112 * @param size number of bytes to select for transmission
2113 * @param retry_time set to the time when we should try again
2114 * (only valid if this function returns zero)
2115 * @return number of bytes selected, or 0 if we decided to
2116 * defer scheduling overall; in that case, retry_time is set.
2119 select_messages (struct Neighbour *n,
2120 size_t size, struct GNUNET_TIME_Relative *retry_time)
2122 struct MessageEntry *pos;
2123 struct MessageEntry *min;
2124 struct MessageEntry *last;
2125 unsigned int min_prio;
2126 struct GNUNET_TIME_Absolute t;
2127 struct GNUNET_TIME_Absolute now;
2128 struct GNUNET_TIME_Relative delta;
2130 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
2133 unsigned int queue_size;
2134 int discard_low_prio;
2136 GNUNET_assert (NULL != n->messages);
2137 now = GNUNET_TIME_absolute_get ();
2138 /* last entry in linked list of messages processed */
2140 /* should we remove the entry with the lowest
2141 priority from consideration for scheduling at the
2152 discard_low_prio = GNUNET_YES;
2153 while (GNUNET_YES == discard_low_prio)
2156 min_prio = UINT_MAX;
2157 discard_low_prio = GNUNET_NO;
2158 /* calculate number of bytes available for transmission at time "t" */
2159 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
2161 /* how many bytes have we (hypothetically) scheduled so far */
2163 /* maximum time we can wait before transmitting anything
2164 and still make all of our deadlines */
2165 slack = GNUNET_TIME_UNIT_FOREVER_REL;
2167 /* note that we use "*2" here because we want to look
2168 a bit further into the future; much more makes no
2169 sense since new message might be scheduled in the
2171 while ((pos != NULL) && (off < size * 2))
2173 if (pos->do_transmit == GNUNET_YES)
2175 /* already removed from consideration */
2179 if (discard_low_prio == GNUNET_NO)
2181 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
2182 if (delta.rel_value > 0)
2184 // FIXME: HUH? Check!
2186 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
2189 if (avail < pos->size)
2191 // FIXME: HUH? Check!
2192 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
2197 /* update slack, considering both its absolute deadline
2198 and relative deadlines caused by other messages
2199 with their respective load */
2200 slack = GNUNET_TIME_relative_min (slack,
2201 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
2203 if (pos->deadline.abs_value <= now.abs_value)
2206 slack = GNUNET_TIME_UNIT_ZERO;
2208 else if (GNUNET_YES == pos->got_slack)
2210 /* should be soon now! */
2211 slack = GNUNET_TIME_relative_min (slack,
2212 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
2217 GNUNET_TIME_relative_min (slack,
2218 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
2219 pos->got_slack = GNUNET_YES;
2220 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
2221 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
2226 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
2227 if (pos->priority <= min_prio)
2229 /* update min for discard */
2230 min_prio = pos->priority;
2235 if (discard_low_prio)
2237 GNUNET_assert (min != NULL);
2238 /* remove lowest-priority entry from consideration */
2239 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
2243 /* guard against sending "tiny" messages with large headers without
2245 if ( (slack.rel_value > GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value) &&
2247 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
2249 /* less than 25% of message would be filled with deadlines still
2250 being met if we delay by one second or more; so just wait for
2251 more data; but do not wait longer than 1s (since we don't want
2252 to delay messages for a really long time either). */
2253 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
2254 /* reset do_transmit values for next time */
2257 pos->do_transmit = GNUNET_NO;
2260 GNUNET_STATISTICS_update (stats,
2261 gettext_noop ("# transmissions delayed due to corking"),
2264 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2265 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
2266 (unsigned long long) retry_time->rel_value,
2268 (unsigned int) size);
2272 /* select marked messages (up to size) for transmission */
2277 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
2279 pos->do_transmit = GNUNET_YES; /* mark for transmission */
2283 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2284 "Selecting message of size %u for transmission\n",
2285 (unsigned int) pos->size);
2291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2292 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
2293 (unsigned int) pos->size,
2296 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
2301 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2302 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
2303 (unsigned long long) off, (unsigned long long) tsize,
2304 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
2305 GNUNET_i2s (&n->peer));
2312 * Batch multiple messages into a larger buffer.
2314 * @param n neighbour to take messages from
2315 * @param buf target buffer
2316 * @param size size of buf
2317 * @param deadline set to transmission deadline for the result
2318 * @param retry_time set to the time when we should try again
2319 * (only valid if this function returns zero)
2320 * @param priority set to the priority of the batch
2321 * @return number of bytes written to buf (can be zero)
2324 batch_message (struct Neighbour *n,
2327 struct GNUNET_TIME_Absolute *deadline,
2328 struct GNUNET_TIME_Relative *retry_time,
2329 unsigned int *priority)
2331 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
2332 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
2333 struct MessageEntry *pos;
2334 struct MessageEntry *prev;
2335 struct MessageEntry *next;
2340 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2341 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
2342 if (0 == select_messages (n, size, retry_time))
2345 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2346 "No messages selected, will try again in %llu ms\n",
2347 retry_time->rel_value);
2351 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
2352 ntm->ats_count = htonl (0);
2353 ntm->ats.type = htonl (0);
2354 ntm->ats.value = htonl (0);
2355 ntm->peer = n->peer;
2358 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
2361 if (GNUNET_YES == pos->do_transmit)
2363 GNUNET_assert (pos->size <= size);
2364 /* do notifications */
2365 /* FIXME: track if we have *any* client that wants
2366 full notifications and only do this if that is
2368 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
2370 memcpy (&ntm[1], &pos[1], pos->size);
2371 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2372 sizeof (struct GNUNET_MessageHeader));
2373 send_to_all_clients (&ntm->header,
2375 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
2379 /* message too large for 'full' notifications, we do at
2380 least the 'hdr' type */
2383 sizeof (struct GNUNET_MessageHeader));
2385 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2387 send_to_all_clients (&ntm->header,
2389 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
2391 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2392 "Encrypting %u bytes with message of type %u and size %u\n",
2394 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
2395 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
2397 /* copy for encrypted transmission */
2398 memcpy (&buf[ret], &pos[1], pos->size);
2401 *priority += pos->priority;
2403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2404 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
2405 (unsigned int) pos->size,
2406 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).rel_value);
2408 deadline->abs_value = GNUNET_MIN (deadline->abs_value, pos->deadline.abs_value);
2422 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2423 "Deadline for message batch is %llu ms\n",
2424 GNUNET_TIME_absolute_get_remaining (*deadline).rel_value);
2431 * Remove messages with deadlines that have long expired from
2434 * @param n neighbour to inspect
2437 discard_expired_messages (struct Neighbour *n)
2439 struct MessageEntry *prev;
2440 struct MessageEntry *next;
2441 struct MessageEntry *pos;
2442 struct GNUNET_TIME_Absolute now;
2443 struct GNUNET_TIME_Relative delta;
2447 now = GNUNET_TIME_absolute_get ();
2453 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
2454 if (delta.rel_value > PAST_EXPIRATION_DISCARD_TIME.rel_value)
2457 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2458 "Message is %llu ms past due, discarding.\n",
2465 GNUNET_STATISTICS_update (stats,
2466 gettext_noop ("# messages discarded (expired prior to transmission)"),
2476 if (GNUNET_YES == disc)
2477 schedule_peer_messages (n);
2482 * Signature of the main function of a task.
2484 * @param cls closure
2485 * @param tc context information (why was this task triggered now)
2488 retry_plaintext_processing (void *cls,
2489 const struct GNUNET_SCHEDULER_TaskContext *tc)
2491 struct Neighbour *n = cls;
2493 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2494 process_plaintext_neighbour_queue (n);
2499 * Send our key (and encrypted PING) to the other peer.
2501 * @param n the other peer
2503 static void send_key (struct Neighbour *n);
2506 * Task that will retry "send_key" if our previous attempt failed
2510 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2512 struct Neighbour *n = cls;
2515 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2516 "Retrying key transmission to `%4s'\n",
2517 GNUNET_i2s (&n->peer));
2519 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2520 n->set_key_retry_frequency =
2521 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
2527 * Check if we have plaintext messages for the specified neighbour
2528 * pending, and if so, consider batching and encrypting them (and
2529 * then trigger processing of the encrypted queue if needed).
2531 * @param n neighbour to check.
2534 process_plaintext_neighbour_queue (struct Neighbour *n)
2536 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
2538 struct EncryptedMessage *em; /* encrypted message */
2539 struct EncryptedMessage *ph; /* plaintext header */
2540 struct MessageEntry *me;
2541 unsigned int priority;
2542 struct GNUNET_TIME_Absolute deadline;
2543 struct GNUNET_TIME_Relative retry_time;
2544 struct GNUNET_CRYPTO_AesInitializationVector iv;
2545 struct GNUNET_CRYPTO_AuthKey auth_key;
2547 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
2549 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
2550 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2554 case PEER_STATE_DOWN:
2557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2558 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2559 GNUNET_i2s(&n->peer));
2562 case PEER_STATE_KEY_SENT:
2563 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2564 n->retry_set_key_task
2565 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2566 &set_key_retry_task, n);
2568 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2569 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2570 GNUNET_i2s(&n->peer));
2573 case PEER_STATE_KEY_RECEIVED:
2574 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2575 n->retry_set_key_task
2576 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2577 &set_key_retry_task, n);
2579 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2580 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2581 GNUNET_i2s(&n->peer));
2584 case PEER_STATE_KEY_CONFIRMED:
2585 /* ready to continue */
2588 discard_expired_messages (n);
2589 if (n->messages == NULL)
2592 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2593 "Plaintext message queue for `%4s' is empty.\n",
2594 GNUNET_i2s(&n->peer));
2596 return; /* no pending messages */
2598 if (n->encrypted_head != NULL)
2601 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2602 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2603 GNUNET_i2s(&n->peer));
2605 return; /* wait for messages already encrypted to be
2608 ph = (struct EncryptedMessage *) pbuf;
2609 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2611 used = sizeof (struct EncryptedMessage);
2612 used += batch_message (n,
2614 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2615 &deadline, &retry_time, &priority);
2616 if (used == sizeof (struct EncryptedMessage))
2619 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2620 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2621 GNUNET_i2s(&n->peer));
2623 /* no messages selected for sending, try again later... */
2624 n->retry_plaintext_task =
2625 GNUNET_SCHEDULER_add_delayed (retry_time,
2626 &retry_plaintext_processing, n);
2629 #if DEBUG_CORE_QUOTA
2630 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2631 "Sending %u b/s as new limit to peer `%4s'\n",
2632 (unsigned int) ntohl (n->bw_in.value__),
2633 GNUNET_i2s (&n->peer));
2635 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
2636 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2637 ph->inbound_bw_limit = n->bw_in;
2638 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2640 /* setup encryption message header */
2641 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2642 me->deadline = deadline;
2643 me->priority = priority;
2645 em = (struct EncryptedMessage *) &me[1];
2646 em->header.size = htons (used);
2647 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2648 em->iv_seed = ph->iv_seed;
2649 derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
2652 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2653 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2654 (unsigned int) used - ENCRYPTED_HEADER_SIZE,
2655 GNUNET_i2s(&n->peer),
2656 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).rel_value);
2658 GNUNET_assert (GNUNET_OK ==
2661 &ph->sequence_number,
2662 &em->sequence_number, used - ENCRYPTED_HEADER_SIZE));
2663 derive_auth_key (&auth_key,
2666 n->encrypt_key_created);
2667 GNUNET_CRYPTO_hmac (&auth_key,
2668 &em->sequence_number,
2669 used - ENCRYPTED_HEADER_SIZE,
2672 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2673 "Authenticated %u bytes of ciphertext %u: `%s'\n",
2674 used - ENCRYPTED_HEADER_SIZE,
2675 GNUNET_CRYPTO_crc32_n (&em->sequence_number,
2676 used - ENCRYPTED_HEADER_SIZE),
2677 GNUNET_h2s (&em->hmac));
2679 /* append to transmission list */
2680 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2684 process_encrypted_neighbour_queue (n);
2685 schedule_peer_messages (n);
2690 * Function that recalculates the bandwidth quota for the
2691 * given neighbour and transmits it to the transport service.
2693 * @param cls neighbour for the quota update
2697 neighbour_quota_update (void *cls,
2698 const struct GNUNET_SCHEDULER_TaskContext *tc);
2702 * Schedule the task that will recalculate the bandwidth
2703 * quota for this peer (and possibly force a disconnect of
2704 * idle peers by calculating a bandwidth of zero).
2707 schedule_quota_update (struct Neighbour *n)
2709 GNUNET_assert (n->quota_update_task ==
2710 GNUNET_SCHEDULER_NO_TASK);
2711 n->quota_update_task
2712 = GNUNET_SCHEDULER_add_delayed (QUOTA_UPDATE_FREQUENCY,
2713 &neighbour_quota_update,
2719 * Initialize a new 'struct Neighbour'.
2721 * @param pid ID of the new neighbour
2722 * @return handle for the new neighbour
2724 static struct Neighbour *
2725 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2727 struct Neighbour *n;
2728 struct GNUNET_TIME_Absolute now;
2731 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2732 "Creating neighbour entry for peer `%4s'\n",
2735 n = GNUNET_malloc (sizeof (struct Neighbour));
2737 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2738 now = GNUNET_TIME_absolute_get ();
2739 n->encrypt_key_created = now;
2740 n->last_activity = now;
2741 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2742 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2743 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2744 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2745 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2746 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
2748 GNUNET_assert (GNUNET_OK ==
2749 GNUNET_CONTAINER_multihashmap_put (neighbours,
2750 &n->peer.hashPubKey,
2752 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2753 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
2754 GNUNET_CONTAINER_multihashmap_size (neighbours), GNUNET_NO);
2755 neighbour_quota_update (n, NULL);
2756 consider_free_neighbour (n);
2762 * Handle CORE_SEND request.
2765 * @param client the client issuing the request
2766 * @param message the "struct SendMessage"
2769 handle_client_send (void *cls,
2770 struct GNUNET_SERVER_Client *client,
2771 const struct GNUNET_MessageHeader *message)
2773 const struct SendMessage *sm;
2774 struct Neighbour *n;
2775 struct MessageEntry *prev;
2776 struct MessageEntry *pos;
2777 struct MessageEntry *e;
2778 struct MessageEntry *min_prio_entry;
2779 struct MessageEntry *min_prio_prev;
2780 unsigned int min_prio;
2781 unsigned int queue_size;
2784 msize = ntohs (message->size);
2786 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2788 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "about to assert fail, msize is %d, should be at least %d\n", msize, sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader));
2791 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2794 sm = (const struct SendMessage *) message;
2795 msize -= sizeof (struct SendMessage);
2796 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2799 GNUNET_SERVER_mst_receive (mst,
2801 (const char*) &sm[1],
2806 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2809 n = find_neighbour (&sm->peer);
2811 n = create_neighbour (&sm->peer);
2813 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2814 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2816 (unsigned int) msize,
2817 GNUNET_i2s (&sm->peer));
2819 discard_expired_messages (n);
2820 /* bound queue size */
2821 /* NOTE: this entire block to bound the queue size should be
2822 obsolete with the new client-request code and the
2823 'schedule_peer_messages' mechanism; we still have this code in
2824 here for now as a sanity check for the new mechanmism;
2825 ultimately, we should probably simply reject SEND messages that
2826 are not 'approved' (or provide a new core API for very unreliable
2827 delivery that always sends with priority 0). Food for thought. */
2828 min_prio = UINT32_MAX;
2829 min_prio_entry = NULL;
2830 min_prio_prev = NULL;
2836 if (pos->priority <= min_prio)
2838 min_prio_entry = pos;
2839 min_prio_prev = prev;
2840 min_prio = pos->priority;
2846 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2849 if (ntohl(sm->priority) <= min_prio)
2851 /* discard new entry; this should no longer happen! */
2854 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2855 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2857 (unsigned int) MAX_PEER_QUEUE_SIZE,
2858 (unsigned int) msize,
2859 (unsigned int) ntohs (message->type));
2861 GNUNET_STATISTICS_update (stats,
2862 gettext_noop ("# discarded CORE_SEND requests"),
2866 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2869 GNUNET_assert (min_prio_entry != NULL);
2870 /* discard "min_prio_entry" */
2872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2873 "Queue full, discarding existing older request\n");
2875 GNUNET_STATISTICS_update (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 1, GNUNET_NO);
2876 if (min_prio_prev == NULL)
2877 n->messages = min_prio_entry->next;
2879 min_prio_prev->next = min_prio_entry->next;
2880 GNUNET_free (min_prio_entry);
2884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2885 "Adding transmission request for `%4s' of size %u to queue\n",
2886 GNUNET_i2s (&sm->peer),
2887 (unsigned int) msize);
2889 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2890 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2891 e->priority = ntohl (sm->priority);
2893 memcpy (&e[1], &sm[1], msize);
2895 /* insert, keep list sorted by deadline */
2898 while ((pos != NULL) && (pos->deadline.abs_value < e->deadline.abs_value))
2909 /* consider scheduling now */
2910 process_plaintext_neighbour_queue (n);
2912 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2917 * Function called when the transport service is ready to
2918 * receive a message. Only resets 'n->th' to NULL.
2920 * @param cls neighbour to use message from
2921 * @param size number of bytes we can transmit
2922 * @param buf where to copy the message
2923 * @return number of bytes transmitted
2926 notify_transport_connect_done (void *cls,
2930 struct Neighbour *n = cls;
2933 if (GNUNET_YES != n->is_connected)
2935 /* transport should only call us to transmit a message after
2936 * telling us about a successful connection to the respective peer */
2938 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2939 "Timeout on notify connect!\n");
2941 GNUNET_STATISTICS_update (stats,
2942 gettext_noop ("# connection requests timed out in transport"),
2949 GNUNET_STATISTICS_update (stats,
2950 gettext_noop ("# connection requests timed out in transport"),
2953 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2954 _("Failed to connect to `%4s': transport failed to connect\n"),
2955 GNUNET_i2s (&n->peer));
2958 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2959 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2960 GNUNET_i2s (&n->peer));
2961 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2962 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2963 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (&set_key_retry_task,
2970 * Handle CORE_REQUEST_CONNECT request.
2973 * @param client the client issuing the request
2974 * @param message the "struct ConnectMessage"
2977 handle_client_request_connect (void *cls,
2978 struct GNUNET_SERVER_Client *client,
2979 const struct GNUNET_MessageHeader *message)
2981 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2982 struct Neighbour *n;
2983 struct GNUNET_TIME_Relative timeout;
2985 if (0 == memcmp (&cm->peer,
2987 sizeof (struct GNUNET_PeerIdentity)))
2989 /* In this case a client has asked us to connect to ourselves, not really an error! */
2990 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2993 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2994 GNUNET_break (ntohl (cm->reserved) == 0);
2995 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2996 n = find_neighbour (&cm->peer);
2998 n = create_neighbour (&cm->peer);
2999 if ( (GNUNET_YES == n->is_connected) ||
3002 if (GNUNET_YES == n->is_connected)
3003 GNUNET_STATISTICS_update (stats,
3004 gettext_noop ("# connection requests ignored (already connected)"),
3009 GNUNET_TRANSPORT_notify_transmit_ready_cancel(n->th);
3010 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3012 sizeof (struct GNUNET_MessageHeader), 0,
3014 ¬ify_transport_connect_done,
3016 GNUNET_break (NULL != n->th);
3017 GNUNET_STATISTICS_update (stats,
3018 gettext_noop ("# connection requests retried (due to repeat request connect)"),
3022 return; /* already connected, or at least trying */
3024 GNUNET_STATISTICS_update (stats,
3025 gettext_noop ("# connection requests received"),
3030 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3031 "Core received `%s' request for `%4s', will try to establish connection\n",
3033 GNUNET_i2s (&cm->peer));
3036 /* ask transport to connect to the peer */
3037 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3039 sizeof (struct GNUNET_MessageHeader), 0,
3041 ¬ify_transport_connect_done,
3043 GNUNET_break (NULL != n->th);
3048 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3049 * the neighbour's struct and retry send_key. Or, if we did not get a
3050 * HELLO, just do nothing.
3052 * @param cls the 'struct Neighbour' to retry sending the key for
3053 * @param peer the peer for which this is the HELLO
3054 * @param hello HELLO message of that peer
3055 * @param err_msg NULL if successful, otherwise contains error message
3058 process_hello_retry_send_key (void *cls,
3059 const struct GNUNET_PeerIdentity *peer,
3060 const struct GNUNET_HELLO_Message *hello,
3061 const char *err_msg)
3063 struct Neighbour *n = cls;
3065 if (err_msg != NULL)
3067 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3068 _("Error in communication with PEERINFO service\n"));
3075 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3076 "Entered `%s' and `%s' is NULL!\n",
3077 "process_hello_retry_send_key",
3081 if (n->public_key != NULL)
3083 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3085 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3086 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3088 GNUNET_STATISTICS_update (stats,
3089 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3097 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3098 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
3099 GNUNET_i2s (&n->peer));
3101 GNUNET_STATISTICS_update (stats,
3102 gettext_noop ("# Delayed connecting due to lack of public key"),
3105 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
3106 n->retry_set_key_task
3107 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3108 &set_key_retry_task, n);
3114 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3115 "Entered `%s' for peer `%4s'\n",
3116 "process_hello_retry_send_key",
3119 if (n->public_key != NULL)
3121 /* already have public key, why are we here? */
3127 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3128 "Received new `%s' message for `%4s', initiating key exchange.\n",
3133 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3134 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3136 GNUNET_STATISTICS_update (stats,
3137 gettext_noop ("# Error extracting public key from HELLO"),
3140 GNUNET_free (n->public_key);
3141 n->public_key = NULL;
3143 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3144 "GNUNET_HELLO_get_key returned awfully\n");
3152 * Send our key (and encrypted PING) to the other peer.
3154 * @param n the other peer
3157 send_key (struct Neighbour *n)
3159 struct MessageEntry *pos;
3160 struct SetKeyMessage *sm;
3161 struct MessageEntry *me;
3162 struct PingMessage pp;
3163 struct PingMessage *pm;
3164 struct GNUNET_CRYPTO_AesInitializationVector iv;
3166 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3168 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3169 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3171 if (n->pitr != NULL)
3174 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3175 "Key exchange in progress with `%4s'.\n",
3176 GNUNET_i2s (&n->peer));
3178 return; /* already in progress */
3180 if (GNUNET_YES != n->is_connected)
3183 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3184 "Not yet connected to peer `%4s'!\n",
3185 GNUNET_i2s (&n->peer));
3189 GNUNET_STATISTICS_update (stats,
3190 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
3193 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3195 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
3197 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3198 ¬ify_encrypted_transmit_ready,
3204 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3205 "Asked to perform key exchange with `%4s'.\n",
3206 GNUNET_i2s (&n->peer));
3208 if (n->public_key == NULL)
3210 /* lookup n's public key, then try again */
3212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3213 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
3214 GNUNET_i2s (&n->peer));
3216 GNUNET_assert (n->pitr == NULL);
3217 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3219 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
3220 &process_hello_retry_send_key, n);
3223 pos = n->encrypted_head;
3226 if (GNUNET_YES == pos->is_setkey)
3228 if (pos->sender_status == n->status)
3231 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3232 "`%s' message for `%4s' queued already\n",
3234 GNUNET_i2s (&n->peer));
3236 goto trigger_processing;
3238 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
3243 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3244 "Removing queued `%s' message for `%4s', will create a new one\n",
3246 GNUNET_i2s (&n->peer));
3256 case PEER_STATE_DOWN:
3257 n->status = PEER_STATE_KEY_SENT;
3259 case PEER_STATE_KEY_SENT:
3261 case PEER_STATE_KEY_RECEIVED:
3263 case PEER_STATE_KEY_CONFIRMED:
3271 /* first, set key message */
3272 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3273 sizeof (struct SetKeyMessage) +
3274 sizeof (struct PingMessage));
3275 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
3276 me->priority = SET_KEY_PRIORITY;
3277 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
3278 me->is_setkey = GNUNET_YES;
3279 me->got_slack = GNUNET_YES; /* do not defer this one! */
3280 me->sender_status = n->status;
3281 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3285 sm = (struct SetKeyMessage *) &me[1];
3286 sm->header.size = htons (sizeof (struct SetKeyMessage));
3287 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
3288 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
3289 PEER_STATE_KEY_SENT : n->status));
3291 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3292 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3293 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3294 sizeof (struct GNUNET_PeerIdentity));
3295 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
3296 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
3297 sm->target = n->peer;
3298 GNUNET_assert (GNUNET_OK ==
3299 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
3301 GNUNET_CRYPTO_AesSessionKey),
3303 &sm->encrypted_key));
3304 GNUNET_assert (GNUNET_OK ==
3305 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
3307 pm = (struct PingMessage *) &sm[1];
3308 pm->header.size = htons (sizeof (struct PingMessage));
3309 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
3310 pm->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3311 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
3312 pp.challenge = n->ping_challenge;
3313 pp.target = n->peer;
3315 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3316 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
3318 (unsigned int) n->ping_challenge,
3319 GNUNET_i2s (&n->peer),
3320 (unsigned int) n->encrypt_key.crc32,
3321 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3328 sizeof (struct PingMessage) -
3329 ((void *) &pm->target - (void *) pm));
3330 GNUNET_STATISTICS_update (stats,
3331 gettext_noop ("# SET_KEY and PING messages created"),
3335 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3336 "Have %llu ms left for `%s' transmission.\n",
3337 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).rel_value,
3341 /* trigger queue processing */
3342 process_encrypted_neighbour_queue (n);
3343 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
3344 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
3345 n->retry_set_key_task
3346 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3347 &set_key_retry_task, n);
3352 * We received a SET_KEY message. Validate and update
3353 * our key material and status.
3355 * @param n the neighbour from which we received message m
3356 * @param m the set key message we received
3357 * @param ats performance data
3358 * @param ats_count number of entries in ats (excluding 0-termination)
3361 handle_set_key (struct Neighbour *n,
3362 const struct SetKeyMessage *m,
3363 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3364 uint32_t ats_count);
3369 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3370 * the neighbour's struct and retry handling the set_key message. Or,
3371 * if we did not get a HELLO, just free the set key message.
3373 * @param cls pointer to the set key message
3374 * @param peer the peer for which this is the HELLO
3375 * @param hello HELLO message of that peer
3376 * @param err_msg NULL if successful, otherwise contains error message
3379 process_hello_retry_handle_set_key (void *cls,
3380 const struct GNUNET_PeerIdentity *peer,
3381 const struct GNUNET_HELLO_Message *hello,
3382 const char *err_msg)
3384 struct Neighbour *n = cls;
3385 struct SetKeyMessage *sm = n->skm;
3387 if (err_msg != NULL)
3389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3390 _("Error in communication with PEERINFO service\n"));
3398 if (n->public_key != NULL)
3401 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3402 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
3404 GNUNET_i2s (&n->peer),
3407 handle_set_key (n, sm, NULL, 0);
3411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3412 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
3414 GNUNET_i2s (&n->peer));
3419 if (n->public_key != NULL)
3420 return; /* multiple HELLOs match!? */
3422 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3423 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3425 GNUNET_break_op (0);
3426 GNUNET_free (n->public_key);
3427 n->public_key = NULL;
3433 * Merge the given performance data with the data we currently
3434 * track for the given neighbour.
3436 * @param n neighbour
3437 * @param ats new performance data
3438 * @param ats_count number of records in ats
3441 update_neighbour_performance (struct Neighbour *n,
3442 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3450 for (i = 0; i < ats_count; i++)
3452 for (j=0;j < n->ats_count; j++)
3454 if (n->ats[j].type == ats[i].type)
3456 n->ats[j].value = ats[i].value;
3460 if (j == n->ats_count)
3462 GNUNET_array_append (n->ats,
3471 * We received a PING message. Validate and transmit
3474 * @param n sender of the PING
3475 * @param m the encrypted PING message itself
3476 * @param ats performance data
3477 * @param ats_count number of entries in ats (excluding 0-termination)
3480 handle_ping (struct Neighbour *n,
3481 const struct PingMessage *m,
3482 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3485 struct PingMessage t;
3486 struct PongMessage tx;
3487 struct PongMessage *tp;
3488 struct MessageEntry *me;
3489 struct GNUNET_CRYPTO_AesInitializationVector iv;
3492 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3493 "Core service receives `%s' request from `%4s'.\n",
3494 "PING", GNUNET_i2s (&n->peer));
3496 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3502 sizeof (struct PingMessage) -
3503 ((void *) &m->target - (void *) m)))
3506 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3507 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
3509 GNUNET_i2s (&t.target),
3510 (unsigned int) t.challenge,
3511 (unsigned int) n->decrypt_key.crc32,
3512 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3515 GNUNET_STATISTICS_update (stats,
3516 gettext_noop ("# PING messages decrypted"),
3519 if (0 != memcmp (&t.target,
3520 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3522 GNUNET_break_op (0);
3525 update_neighbour_performance (n, ats, ats_count);
3526 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3527 sizeof (struct PongMessage));
3528 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3532 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
3533 me->priority = PONG_PRIORITY;
3534 me->size = sizeof (struct PongMessage);
3535 tx.inbound_bw_limit = n->bw_in;
3536 tx.challenge = t.challenge;
3537 tx.target = t.target;
3538 tp = (struct PongMessage *) &me[1];
3539 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
3540 tp->header.size = htons (sizeof (struct PongMessage));
3541 tp->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3542 derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
3547 sizeof (struct PongMessage) -
3548 ((void *) &tp->challenge - (void *) tp));
3549 GNUNET_STATISTICS_update (stats,
3550 gettext_noop ("# PONG messages created"),
3554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3555 "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
3557 (unsigned int) t.challenge,
3558 (unsigned int) n->encrypt_key.crc32,
3559 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3562 /* trigger queue processing */
3563 process_encrypted_neighbour_queue (n);
3568 * We received a PONG message. Validate and update our status.
3570 * @param n sender of the PONG
3571 * @param m the encrypted PONG message itself
3572 * @param ats performance data
3573 * @param ats_count number of entries in ats (excluding 0-termination)
3576 handle_pong (struct Neighbour *n,
3577 const struct PongMessage *m,
3578 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3581 struct PongMessage t;
3582 struct ConnectNotifyMessage *cnm;
3583 struct GNUNET_CRYPTO_AesInitializationVector iv;
3584 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
3585 struct GNUNET_TRANSPORT_ATS_Information *mats;
3589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3590 "Core service receives `%s' response from `%4s'.\n",
3591 "PONG", GNUNET_i2s (&n->peer));
3593 /* mark as garbage, just to be sure */
3594 memset (&t, 255, sizeof (t));
3595 derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
3602 sizeof (struct PongMessage) -
3603 ((void *) &m->challenge - (void *) m)))
3605 GNUNET_break_op (0);
3608 GNUNET_STATISTICS_update (stats,
3609 gettext_noop ("# PONG messages decrypted"),
3613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3614 "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
3616 GNUNET_i2s (&t.target),
3617 (unsigned int) t.challenge,
3618 (unsigned int) n->decrypt_key.crc32,
3619 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3622 if ((0 != memcmp (&t.target,
3624 sizeof (struct GNUNET_PeerIdentity))) ||
3625 (n->ping_challenge != t.challenge))
3627 /* PONG malformed */
3629 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3630 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
3632 GNUNET_i2s (&n->peer),
3633 (unsigned int) n->ping_challenge);
3634 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3635 "Received malformed `%s' received from `%4s' with challenge %u\n",
3636 "PONG", GNUNET_i2s (&t.target),
3637 (unsigned int) t.challenge);
3639 GNUNET_break_op (n->ping_challenge != t.challenge);
3644 case PEER_STATE_DOWN:
3645 GNUNET_break (0); /* should be impossible */
3647 case PEER_STATE_KEY_SENT:
3648 GNUNET_break (0); /* should be impossible, how did we decrypt? */
3650 case PEER_STATE_KEY_RECEIVED:
3651 GNUNET_STATISTICS_update (stats,
3652 gettext_noop ("# Session keys confirmed via PONG"),
3655 n->status = PEER_STATE_KEY_CONFIRMED;
3656 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
3658 n->bw_out_external_limit = t.inbound_bw_limit;
3659 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3660 n->bw_out_internal_limit);
3661 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3663 GNUNET_TRANSPORT_set_quota (transport,
3667 GNUNET_TIME_UNIT_FOREVER_REL,
3671 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3672 "Confirmed key via `%s' message for peer `%4s'\n",
3673 "PONG", GNUNET_i2s (&n->peer));
3675 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3677 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3678 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3680 update_neighbour_performance (n, ats, ats_count);
3681 size = sizeof (struct ConnectNotifyMessage) +
3682 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3683 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3686 /* recovery strategy: throw away performance data */
3687 GNUNET_array_grow (n->ats,
3690 size = sizeof (struct PeerStatusNotifyMessage) +
3691 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3693 cnm = (struct ConnectNotifyMessage*) buf;
3694 cnm->header.size = htons (size);
3695 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
3696 cnm->ats_count = htonl (n->ats_count);
3697 cnm->peer = n->peer;
3701 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
3702 mats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3703 mats[n->ats_count].value = htonl (0);
3704 send_to_all_clients (&cnm->header,
3706 GNUNET_CORE_OPTION_SEND_CONNECT);
3707 process_encrypted_neighbour_queue (n);
3709 case PEER_STATE_KEY_CONFIRMED:
3710 n->last_activity = GNUNET_TIME_absolute_get ();
3711 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3712 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3714 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3717 handle_peer_status_change (n);
3727 * We received a SET_KEY message. Validate and update
3728 * our key material and status.
3730 * @param n the neighbour from which we received message m
3731 * @param m the set key message we received
3732 * @param ats performance data
3733 * @param ats_count number of entries in ats (excluding 0-termination)
3736 handle_set_key (struct Neighbour *n,
3737 const struct SetKeyMessage *m,
3738 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3741 struct SetKeyMessage *m_cpy;
3742 struct GNUNET_TIME_Absolute t;
3743 struct GNUNET_CRYPTO_AesSessionKey k;
3744 struct PingMessage *ping;
3745 struct PongMessage *pong;
3746 enum PeerStateMachine sender_status;
3749 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3750 "Core service receives `%s' request from `%4s'.\n",
3751 "SET_KEY", GNUNET_i2s (&n->peer));
3753 if (n->public_key == NULL)
3755 if (n->pitr != NULL)
3758 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3759 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3765 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3766 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3768 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3769 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3770 /* lookup n's public key, then try again */
3771 GNUNET_assert (n->skm == NULL);
3773 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3775 GNUNET_TIME_UNIT_MINUTES,
3776 &process_hello_retry_handle_set_key, n);
3777 GNUNET_STATISTICS_update (stats,
3778 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3783 if (0 != memcmp (&m->target,
3785 sizeof (struct GNUNET_PeerIdentity)))
3787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3788 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3790 GNUNET_i2s (&m->target));
3793 if ((ntohl (m->purpose.size) !=
3794 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3795 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3796 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3797 sizeof (struct GNUNET_PeerIdentity)) ||
3799 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3800 &m->purpose, &m->signature, n->public_key)))
3802 /* invalid signature */
3803 GNUNET_break_op (0);
3806 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3807 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3808 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3809 (t.abs_value < n->decrypt_key_created.abs_value))
3811 /* this could rarely happen due to massive re-ordering of
3812 messages on the network level, but is most likely either
3813 a bug or some adversary messing with us. Report. */
3814 GNUNET_break_op (0);
3818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3819 "Decrypting key material.\n");
3821 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3824 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3825 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3826 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3828 /* failed to decrypt !? */
3829 GNUNET_break_op (0);
3832 GNUNET_STATISTICS_update (stats,
3833 gettext_noop ("# SET_KEY messages decrypted"),
3837 if (n->decrypt_key_created.abs_value != t.abs_value)
3839 /* fresh key, reset sequence numbers */
3840 n->last_sequence_number_received = 0;
3841 n->last_packets_bitmap = 0;
3842 n->decrypt_key_created = t;
3844 update_neighbour_performance (n, ats, ats_count);
3845 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3848 case PEER_STATE_DOWN:
3849 n->status = PEER_STATE_KEY_RECEIVED;
3851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3852 "Responding to `%s' with my own key.\n", "SET_KEY");
3856 case PEER_STATE_KEY_SENT:
3857 case PEER_STATE_KEY_RECEIVED:
3858 n->status = PEER_STATE_KEY_RECEIVED;
3859 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3860 (sender_status != PEER_STATE_KEY_CONFIRMED))
3863 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3864 "Responding to `%s' with my own key (other peer has status %u).\n",
3866 (unsigned int) sender_status);
3871 case PEER_STATE_KEY_CONFIRMED:
3872 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3873 (sender_status != PEER_STATE_KEY_CONFIRMED))
3876 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3877 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3879 (unsigned int) sender_status);
3888 if (n->pending_ping != NULL)
3890 ping = n->pending_ping;
3891 n->pending_ping = NULL;
3892 handle_ping (n, ping, NULL, 0);
3895 if (n->pending_pong != NULL)
3897 pong = n->pending_pong;
3898 n->pending_pong = NULL;
3899 handle_pong (n, pong, NULL, 0);
3906 * Send a P2P message to a client.
3908 * @param sender who sent us the message?
3909 * @param client who should we give the message to?
3910 * @param m contains the message to transmit
3911 * @param msize number of bytes in buf to transmit
3914 send_p2p_message_to_client (struct Neighbour *sender,
3915 struct Client *client,
3916 const void *m, size_t msize)
3918 size_t size = msize + sizeof (struct NotifyTrafficMessage) +
3919 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3921 struct NotifyTrafficMessage *ntm;
3922 struct GNUNET_TRANSPORT_ATS_Information *ats;
3924 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3927 /* recovery strategy: throw performance data away... */
3928 GNUNET_array_grow (sender->ats,
3931 size = msize + sizeof (struct NotifyTrafficMessage) +
3932 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3935 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3936 "Core service passes message from `%4s' of type %u to client.\n",
3937 GNUNET_i2s(&sender->peer),
3938 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3940 ntm = (struct NotifyTrafficMessage *) buf;
3941 ntm->header.size = htons (size);
3942 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3943 ntm->ats_count = htonl (sender->ats_count);
3944 ntm->peer = sender->peer;
3948 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * sender->ats_count);
3949 ats[sender->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3950 ats[sender->ats_count].value = htonl (0);
3951 memcpy (&ats[sender->ats_count+1],
3954 send_to_client (client, &ntm->header, GNUNET_YES);
3959 * Deliver P2P message to interested clients.
3961 * @param cls always NULL
3962 * @param client who sent us the message (struct Neighbour)
3963 * @param m the message
3966 deliver_message (void *cls,
3968 const struct GNUNET_MessageHeader *m)
3970 struct Neighbour *sender = client;
3971 size_t msize = ntohs (m->size);
3973 struct Client *cpos;
3979 type = ntohs (m->type);
3981 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3982 "Received encapsulated message of type %u and size %u from `%4s'\n",
3983 (unsigned int) type,
3985 GNUNET_i2s (&sender->peer));
3987 GNUNET_snprintf (buf,
3989 gettext_noop ("# bytes of messages of type %u received"),
3990 (unsigned int) type);
3991 GNUNET_STATISTICS_set (stats,
3995 dropped = GNUNET_YES;
3997 while (cpos != NULL)
3999 deliver_full = GNUNET_NO;
4000 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
4001 deliver_full = GNUNET_YES;
4004 for (tpos = 0; tpos < cpos->tcnt; tpos++)
4006 if (type != cpos->types[tpos])
4008 deliver_full = GNUNET_YES;
4012 if (GNUNET_YES == deliver_full)
4014 send_p2p_message_to_client (sender, cpos, m, msize);
4015 dropped = GNUNET_NO;
4017 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
4019 send_p2p_message_to_client (sender, cpos, m,
4020 sizeof (struct GNUNET_MessageHeader));
4024 if (dropped == GNUNET_YES)
4027 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4028 "Message of type %u from `%4s' not delivered to any client.\n",
4029 (unsigned int) type,
4030 GNUNET_i2s (&sender->peer));
4032 GNUNET_STATISTICS_update (stats,
4033 gettext_noop ("# messages not delivered to any client"),
4040 * We received an encrypted message. Decrypt, validate and
4041 * pass on to the appropriate clients.
4043 * @param n target of the message
4044 * @param m encrypted message
4045 * @param ats performance data
4046 * @param ats_count number of entries in ats (excluding 0-termination)
4049 handle_encrypted_message (struct Neighbour *n,
4050 const struct EncryptedMessage *m,
4051 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4054 size_t size = ntohs (m->header.size);
4056 struct EncryptedMessage *pt; /* plaintext */
4059 struct GNUNET_TIME_Absolute t;
4060 struct GNUNET_CRYPTO_AesInitializationVector iv;
4061 struct GNUNET_CRYPTO_AuthKey auth_key;
4064 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4065 "Core service receives `%s' request from `%4s'.\n",
4066 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
4069 derive_auth_key (&auth_key,
4072 n->decrypt_key_created);
4073 GNUNET_CRYPTO_hmac (&auth_key,
4074 &m->sequence_number,
4075 size - ENCRYPTED_HEADER_SIZE, &ph);
4077 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4078 "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
4079 (unsigned int) size - ENCRYPTED_HEADER_SIZE,
4080 GNUNET_CRYPTO_crc32_n (&m->sequence_number,
4081 size - ENCRYPTED_HEADER_SIZE),
4085 if (0 != memcmp (&ph,
4087 sizeof (GNUNET_HashCode)))
4089 /* checksum failed */
4090 GNUNET_break_op (0);
4093 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
4098 &m->sequence_number,
4099 &buf[ENCRYPTED_HEADER_SIZE],
4100 size - ENCRYPTED_HEADER_SIZE))
4102 pt = (struct EncryptedMessage *) buf;
4104 /* validate sequence number */
4105 snum = ntohl (pt->sequence_number);
4106 if (n->last_sequence_number_received == snum)
4108 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4109 "Received duplicate message, ignoring.\n");
4110 /* duplicate, ignore */
4111 GNUNET_STATISTICS_set (stats,
4112 gettext_noop ("# bytes dropped (duplicates)"),
4117 if ((n->last_sequence_number_received > snum) &&
4118 (n->last_sequence_number_received - snum > 32))
4120 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4121 "Received ancient out of sequence message, ignoring.\n");
4122 /* ancient out of sequence, ignore */
4123 GNUNET_STATISTICS_set (stats,
4124 gettext_noop ("# bytes dropped (out of sequence)"),
4129 if (n->last_sequence_number_received > snum)
4131 unsigned int rotbit =
4132 1 << (n->last_sequence_number_received - snum - 1);
4133 if ((n->last_packets_bitmap & rotbit) != 0)
4135 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4136 "Received duplicate message, ignoring.\n");
4137 GNUNET_STATISTICS_set (stats,
4138 gettext_noop ("# bytes dropped (duplicates)"),
4141 /* duplicate, ignore */
4144 n->last_packets_bitmap |= rotbit;
4146 if (n->last_sequence_number_received < snum)
4148 int shift = (snum - n->last_sequence_number_received);
4149 if (shift >= 8 * sizeof(n->last_packets_bitmap))
4150 n->last_packets_bitmap = 0;
4152 n->last_packets_bitmap <<= shift;
4153 n->last_sequence_number_received = snum;
4156 /* check timestamp */
4157 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
4158 if (GNUNET_TIME_absolute_get_duration (t).rel_value > MAX_MESSAGE_AGE.rel_value)
4160 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4162 ("Message received far too old (%llu ms). Content ignored.\n"),
4163 GNUNET_TIME_absolute_get_duration (t).rel_value);
4164 GNUNET_STATISTICS_set (stats,
4165 gettext_noop ("# bytes dropped (ancient message)"),
4171 /* process decrypted message(s) */
4172 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
4174 #if DEBUG_CORE_SET_QUOTA
4175 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4176 "Received %u b/s as new inbound limit for peer `%4s'\n",
4177 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
4178 GNUNET_i2s (&n->peer));
4180 n->bw_out_external_limit = pt->inbound_bw_limit;
4181 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
4182 n->bw_out_internal_limit);
4183 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
4185 GNUNET_TRANSPORT_set_quota (transport,
4189 GNUNET_TIME_UNIT_FOREVER_REL,
4192 n->last_activity = GNUNET_TIME_absolute_get ();
4193 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4194 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4196 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4199 GNUNET_STATISTICS_set (stats,
4200 gettext_noop ("# bytes of payload decrypted"),
4201 size - sizeof (struct EncryptedMessage),
4203 handle_peer_status_change (n);
4204 update_neighbour_performance (n, ats, ats_count);
4205 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
4207 &buf[sizeof (struct EncryptedMessage)],
4208 size - sizeof (struct EncryptedMessage),
4209 GNUNET_YES, GNUNET_NO))
4210 GNUNET_break_op (0);
4215 * Function called by the transport for each received message.
4217 * @param cls closure
4218 * @param peer (claimed) identity of the other peer
4219 * @param message the message
4220 * @param ats performance data
4221 * @param ats_count number of entries in ats (excluding 0-termination)
4224 handle_transport_receive (void *cls,
4225 const struct GNUNET_PeerIdentity *peer,
4226 const struct GNUNET_MessageHeader *message,
4227 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4230 struct Neighbour *n;
4231 struct GNUNET_TIME_Absolute now;
4238 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4239 "Received message of type %u from `%4s', demultiplexing.\n",
4240 (unsigned int) ntohs (message->type),
4243 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4248 n = find_neighbour (peer);
4250 n = create_neighbour (peer);
4251 changed = GNUNET_NO;
4252 up = (n->status == PEER_STATE_KEY_CONFIRMED);
4253 type = ntohs (message->type);
4254 size = ntohs (message->size);
4257 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
4258 if (size != sizeof (struct SetKeyMessage))
4260 GNUNET_break_op (0);
4263 GNUNET_STATISTICS_update (stats,
4264 gettext_noop ("# session keys received"),
4268 (const struct SetKeyMessage *) message,
4271 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
4272 if (size < sizeof (struct EncryptedMessage) +
4273 sizeof (struct GNUNET_MessageHeader))
4275 GNUNET_break_op (0);
4278 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4279 (n->status != PEER_STATE_KEY_CONFIRMED))
4281 GNUNET_STATISTICS_update (stats,
4282 gettext_noop ("# failed to decrypt message (no session key)"),
4288 handle_encrypted_message (n,
4289 (const struct EncryptedMessage *) message,
4292 case GNUNET_MESSAGE_TYPE_CORE_PING:
4293 if (size != sizeof (struct PingMessage))
4295 GNUNET_break_op (0);
4298 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
4299 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4300 (n->status != PEER_STATE_KEY_CONFIRMED))
4303 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4304 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4305 "PING", GNUNET_i2s (&n->peer));
4307 GNUNET_free_non_null (n->pending_ping);
4308 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
4309 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
4312 handle_ping (n, (const struct PingMessage *) message,
4315 case GNUNET_MESSAGE_TYPE_CORE_PONG:
4316 if (size != sizeof (struct PongMessage))
4318 GNUNET_break_op (0);
4321 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
4322 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
4323 (n->status != PEER_STATE_KEY_CONFIRMED) )
4326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4327 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4328 "PONG", GNUNET_i2s (&n->peer));
4330 GNUNET_free_non_null (n->pending_pong);
4331 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
4332 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
4335 handle_pong (n, (const struct PongMessage *) message,
4339 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4340 _("Unsupported message of type %u received.\n"),
4341 (unsigned int) type);
4344 if (n->status == PEER_STATE_KEY_CONFIRMED)
4346 now = GNUNET_TIME_absolute_get ();
4347 n->last_activity = now;
4348 changed = GNUNET_YES;
4351 GNUNET_STATISTICS_update (stats,
4352 gettext_noop ("# established sessions"),
4355 n->time_established = now;
4357 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4358 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4360 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4365 handle_peer_status_change (n);
4370 * Function that recalculates the bandwidth quota for the
4371 * given neighbour and transmits it to the transport service.
4373 * @param cls neighbour for the quota update
4377 neighbour_quota_update (void *cls,
4378 const struct GNUNET_SCHEDULER_TaskContext *tc)
4380 struct Neighbour *n = cls;
4381 struct GNUNET_BANDWIDTH_Value32NBO q_in;
4382 struct GNUNET_BANDWIDTH_Value32NBO q_out;
4383 struct GNUNET_BANDWIDTH_Value32NBO q_out_min;
4386 unsigned long long distributable;
4387 uint64_t need_per_peer;
4388 uint64_t need_per_second;
4389 unsigned int neighbour_count;
4392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4393 "Neighbour quota update calculation running for peer `%4s'\n",
4394 GNUNET_i2s (&n->peer));
4396 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
4397 /* calculate relative preference among all neighbours;
4398 divides by a bit more to avoid division by zero AND to
4399 account for possibility of new neighbours joining any time
4400 AND to convert to double... */
4401 neighbour_count = GNUNET_CONTAINER_multihashmap_size (neighbours);
4402 if (neighbour_count == 0)
4404 if (preference_sum == 0)
4406 pref_rel = 1.0 / (double) neighbour_count;
4410 pref_rel = n->current_preference / preference_sum;
4412 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
4413 GNUNET_TIME_UNIT_SECONDS);
4414 need_per_second = need_per_peer * neighbour_count;
4416 /* calculate inbound bandwidth per peer */
4418 if (bandwidth_target_in_bps > need_per_second)
4419 distributable = bandwidth_target_in_bps - need_per_second;
4420 share = distributable * pref_rel;
4421 if (share + need_per_peer > UINT32_MAX)
4422 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4424 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4426 /* calculate outbound bandwidth per peer */
4428 if (bandwidth_target_out_bps > need_per_second)
4429 distributable = bandwidth_target_out_bps - need_per_second;
4430 share = distributable * pref_rel;
4431 if (share + need_per_peer > UINT32_MAX)
4432 q_out = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4434 q_out = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4435 n->bw_out_internal_limit = q_out;
4437 q_out_min = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit, n->bw_out_internal_limit);
4438 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window, n->bw_out);
4440 /* check if we want to disconnect for good due to inactivity */
4441 if ( (GNUNET_TIME_absolute_get_duration (get_neighbour_timeout (n)).rel_value > 0) &&
4442 (GNUNET_TIME_absolute_get_duration (n->time_established).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) )
4445 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4446 "Forcing disconnect of `%4s' due to inactivity\n",
4447 GNUNET_i2s (&n->peer));
4449 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
4451 #if DEBUG_CORE_QUOTA
4452 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4453 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
4454 GNUNET_i2s (&n->peer),
4455 (unsigned int) ntohl (q_in.value__),
4456 bandwidth_target_out_bps,
4457 (unsigned int) ntohl (n->bw_in.value__),
4458 (unsigned int) ntohl (n->bw_out.value__),
4459 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
4461 if ((n->bw_in.value__ != q_in.value__) || (n->bw_out.value__ != q_out_min.value__))
4463 if (n->bw_in.value__ != q_in.value__)
4465 if (n->bw_out.value__ != q_out_min.value__)
4466 n->bw_out = q_out_min;
4467 if (GNUNET_YES == n->is_connected)
4468 GNUNET_TRANSPORT_set_quota (transport,
4472 GNUNET_TIME_UNIT_FOREVER_REL,
4474 handle_peer_status_change (n);
4476 schedule_quota_update (n);
4481 * Function called by transport to notify us that
4482 * a peer connected to us (on the network level).
4484 * @param cls closure
4485 * @param peer the peer that connected
4486 * @param ats performance data
4487 * @param ats_count number of entries in ats (excluding 0-termination)
4490 handle_transport_notify_connect (void *cls,
4491 const struct GNUNET_PeerIdentity *peer,
4492 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4495 struct Neighbour *n;
4497 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4502 n = find_neighbour (peer);
4505 if (GNUNET_YES == n->is_connected)
4507 /* duplicate connect notification!? */
4514 n = create_neighbour (peer);
4516 GNUNET_STATISTICS_update (stats,
4517 gettext_noop ("# peers connected (transport)"),
4520 n->is_connected = GNUNET_YES;
4521 update_neighbour_performance (n, ats, ats_count);
4522 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
4525 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
4529 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4530 "Received connection from `%4s'.\n",
4531 GNUNET_i2s (&n->peer));
4533 GNUNET_TRANSPORT_set_quota (transport,
4537 GNUNET_TIME_UNIT_FOREVER_REL,
4544 * Function called by transport telling us that a peer
4547 * @param cls closure
4548 * @param peer the peer that disconnected
4551 handle_transport_notify_disconnect (void *cls,
4552 const struct GNUNET_PeerIdentity *peer)
4554 struct DisconnectNotifyMessage cnm;
4555 struct Neighbour *n;
4556 struct ClientActiveRequest *car;
4557 struct GNUNET_TIME_Relative left;
4560 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4561 "Peer `%4s' disconnected from us; received notification from transport.\n",
4564 n = find_neighbour (peer);
4570 GNUNET_break (n->is_connected == GNUNET_YES);
4571 if (n->status == PEER_STATE_KEY_CONFIRMED)
4573 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
4574 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
4575 cnm.reserved = htonl (0);
4577 send_to_all_clients (&cnm.header, GNUNET_NO, GNUNET_CORE_OPTION_SEND_DISCONNECT);
4578 GNUNET_STATISTICS_update (stats,
4579 gettext_noop ("# established sessions"),
4584 /* On transport disconnect transport doesn't cancel requests, so must do so here. */
4587 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
4590 n->is_connected = GNUNET_NO;
4591 n->status = PEER_STATE_DOWN;
4592 while (NULL != (car = n->active_client_request_head))
4594 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
4595 n->active_client_request_tail,
4597 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
4598 &n->peer.hashPubKey,
4603 GNUNET_STATISTICS_update (stats,
4604 gettext_noop ("# peers connected (transport)"),
4607 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
4608 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
4609 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4610 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
4611 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
4613 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
4614 &consider_free_task,
4620 * Wrapper around 'free_neighbour'; helper for 'cleaning_task'.
4623 free_neighbour_helper (void *cls,
4624 const GNUNET_HashCode *key,
4627 struct Neighbour *n = value;
4635 * Last task run during shutdown. Disconnects us from
4639 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4644 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4645 "Core service shutting down.\n");
4647 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
4648 &free_neighbour_helper,
4650 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
4652 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), 0, GNUNET_NO);
4653 GNUNET_assert (transport != NULL);
4654 GNUNET_TRANSPORT_disconnect (transport);
4656 GNUNET_SERVER_notification_context_destroy (notifier);
4658 while (NULL != (c = clients))
4659 handle_client_disconnect (NULL, c->client_handle);
4660 if (my_private_key != NULL)
4661 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4663 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4664 if (peerinfo != NULL)
4665 GNUNET_PEERINFO_disconnect (peerinfo);
4667 GNUNET_SERVER_mst_destroy (mst);
4672 * Initiate core service.
4674 * @param cls closure
4675 * @param server the initialized server
4676 * @param c configuration to use
4680 struct GNUNET_SERVER_Handle *server,
4681 const struct GNUNET_CONFIGURATION_Handle *c)
4683 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4684 {&handle_client_init, NULL,
4685 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
4686 {&handle_client_iterate_peers, NULL,
4687 GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS,
4688 sizeof (struct GNUNET_MessageHeader)},
4689 {&handle_client_have_peer, NULL,
4690 GNUNET_MESSAGE_TYPE_CORE_PEER_CONNECTED,
4691 sizeof (struct GNUNET_MessageHeader) + sizeof(struct GNUNET_PeerIdentity)},
4692 {&handle_client_request_info, NULL,
4693 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
4694 sizeof (struct RequestInfoMessage)},
4695 {&handle_client_send_request, NULL,
4696 GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST,
4697 sizeof (struct SendMessageRequest)},
4698 {&handle_client_send, NULL,
4699 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
4700 {&handle_client_request_connect, NULL,
4701 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
4702 sizeof (struct ConnectMessage)},
4708 /* parse configuration */
4711 GNUNET_CONFIGURATION_get_value_number (c,
4714 &bandwidth_target_in_bps)) ||
4716 GNUNET_CONFIGURATION_get_value_number (c,
4719 &bandwidth_target_out_bps)) ||
4721 GNUNET_CONFIGURATION_get_value_filename (c,
4723 "HOSTKEY", &keyfile)))
4725 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4727 ("Core service is lacking key configuration settings. Exiting.\n"));
4728 GNUNET_SCHEDULER_shutdown ();
4731 peerinfo = GNUNET_PEERINFO_connect (cfg);
4732 if (NULL == peerinfo)
4734 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4735 _("Could not access PEERINFO service. Exiting.\n"));
4736 GNUNET_SCHEDULER_shutdown ();
4737 GNUNET_free (keyfile);
4740 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4741 GNUNET_free (keyfile);
4742 if (my_private_key == NULL)
4744 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4745 _("Core service could not access hostkey. Exiting.\n"));
4746 GNUNET_PEERINFO_disconnect (peerinfo);
4747 GNUNET_SCHEDULER_shutdown ();
4750 neighbours = GNUNET_CONTAINER_multihashmap_create (128);
4751 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4752 GNUNET_CRYPTO_hash (&my_public_key,
4753 sizeof (my_public_key), &my_identity.hashPubKey);
4754 self.public_key = &my_public_key;
4755 self.peer = my_identity;
4756 self.last_activity = GNUNET_TIME_UNIT_FOREVER_ABS;
4757 self.status = PEER_STATE_KEY_CONFIRMED;
4758 self.is_connected = GNUNET_YES;
4759 /* setup notification */
4760 notifier = GNUNET_SERVER_notification_context_create (server,
4762 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
4763 /* setup transport connection */
4764 transport = GNUNET_TRANSPORT_connect (cfg,
4767 &handle_transport_receive,
4768 &handle_transport_notify_connect,
4769 &handle_transport_notify_disconnect);
4770 GNUNET_assert (NULL != transport);
4771 stats = GNUNET_STATISTICS_create ("core", cfg);
4773 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded CORE_SEND requests"), 0, GNUNET_NO);
4774 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 0, GNUNET_NO);
4776 mst = GNUNET_SERVER_mst_create (&deliver_message,
4778 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
4779 &cleaning_task, NULL);
4780 /* process client requests */
4781 GNUNET_SERVER_add_handlers (server, handlers);
4782 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4783 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
4789 * The main function for the transport service.
4791 * @param argc number of arguments from the command line
4792 * @param argv command line arguments
4793 * @return 0 ok, 1 on error
4796 main (int argc, char *const *argv)
4798 return (GNUNET_OK ==
4799 GNUNET_SERVICE_run (argc,
4802 GNUNET_SERVICE_OPTION_NONE,
4803 &run, NULL)) ? 0 : 1;
4806 /* end of gnunet-service-core.c */