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_assert (NULL != n);
1379 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1380 n->active_client_request_tail,
1388 * A client disconnected, clean up.
1390 * @param cls closure
1391 * @param client identification of the client
1394 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
1397 struct Client *prev;
1401 #if DEBUG_CORE_CLIENT
1402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1403 "Client %p has disconnected from core service.\n",
1410 if (client == pos->client_handle)
1417 /* client never sent INIT */
1421 clients = pos->next;
1423 prev->next = pos->next;
1424 if (pos->requests != NULL)
1426 GNUNET_CONTAINER_multihashmap_iterate (pos->requests,
1427 &destroy_active_client_request,
1429 GNUNET_CONTAINER_multihashmap_destroy (pos->requests);
1436 * Helper function for handle_client_iterate_peers.
1438 * @param cls the 'struct GNUNET_SERVER_TransmitContext' to queue replies
1439 * @param key identity of the connected peer
1440 * @param value the 'struct Neighbour' for the peer
1441 * @return GNUNET_OK (continue to iterate)
1444 queue_connect_message (void *cls,
1445 const GNUNET_HashCode *key,
1448 struct GNUNET_SERVER_TransmitContext *tc = cls;
1449 struct Neighbour *n = value;
1450 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1451 struct GNUNET_TRANSPORT_ATS_Information *ats;
1453 struct ConnectNotifyMessage *cnm;
1455 cnm = (struct ConnectNotifyMessage*) buf;
1456 if (n->status != PEER_STATE_KEY_CONFIRMED)
1458 size = sizeof (struct ConnectNotifyMessage) +
1459 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1460 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1463 /* recovery strategy: throw away performance data */
1464 GNUNET_array_grow (n->ats,
1467 size = sizeof (struct PeerStatusNotifyMessage) +
1468 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1470 cnm = (struct ConnectNotifyMessage*) buf;
1471 cnm->header.size = htons (size);
1472 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1473 cnm->ats_count = htonl (n->ats_count);
1477 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
1478 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1479 ats[n->ats_count].value = htonl (0);
1480 #if DEBUG_CORE_CLIENT
1481 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1482 "Sending `%s' message to client.\n",
1485 cnm->peer = n->peer;
1486 GNUNET_SERVER_transmit_context_append_message (tc,
1493 * Handle CORE_ITERATE_PEERS request.
1496 * @param client client sending the iteration request
1497 * @param message iteration request message
1500 handle_client_iterate_peers (void *cls,
1501 struct GNUNET_SERVER_Client *client,
1502 const struct GNUNET_MessageHeader *message)
1505 struct GNUNET_MessageHeader done_msg;
1506 struct GNUNET_SERVER_TransmitContext *tc;
1508 /* notify new client about existing neighbours */
1510 msize = ntohs(message->size);
1511 tc = GNUNET_SERVER_transmit_context_create (client);
1512 if (msize == sizeof(struct GNUNET_MessageHeader))
1513 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &queue_connect_message, tc);
1517 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1518 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
1519 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
1520 GNUNET_SERVER_transmit_context_run (tc,
1521 GNUNET_TIME_UNIT_FOREVER_REL);
1525 * Handle CORE_ITERATE_PEERS request. Notify client about existing neighbours.
1528 * @param client client sending the iteration request
1529 * @param message iteration request message
1532 handle_client_have_peer (void *cls,
1533 struct GNUNET_SERVER_Client *client,
1534 const struct GNUNET_MessageHeader *message)
1537 struct GNUNET_MessageHeader done_msg;
1538 struct GNUNET_SERVER_TransmitContext *tc;
1539 struct GNUNET_PeerIdentity *peer;
1541 tc = GNUNET_SERVER_transmit_context_create (client);
1542 peer = (struct GNUNET_PeerIdentity *) &message[1];
1543 GNUNET_CONTAINER_multihashmap_get_multiple(neighbours,
1545 &queue_connect_message,
1547 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1548 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
1549 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
1550 GNUNET_SERVER_transmit_context_run (tc,
1551 GNUNET_TIME_UNIT_FOREVER_REL);
1556 * Handle REQUEST_INFO request.
1559 * @param client client sending the request
1560 * @param message iteration request message
1563 handle_client_request_info (void *cls,
1564 struct GNUNET_SERVER_Client *client,
1565 const struct GNUNET_MessageHeader *message)
1567 const struct RequestInfoMessage *rcm;
1569 struct Neighbour *n;
1570 struct ConfigurationInfoMessage cim;
1571 int32_t want_reserv;
1573 unsigned long long old_preference;
1574 struct GNUNET_TIME_Relative rdelay;
1576 rdelay = GNUNET_TIME_relative_get_zero();
1577 #if DEBUG_CORE_CLIENT
1578 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1579 "Core service receives `%s' request.\n", "REQUEST_INFO");
1584 if (client == pos->client_handle)
1591 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1595 rcm = (const struct RequestInfoMessage *) message;
1596 n = find_neighbour (&rcm->peer);
1597 memset (&cim, 0, sizeof (cim));
1600 want_reserv = ntohl (rcm->reserve_inbound);
1601 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1603 n->bw_out_internal_limit = rcm->limit_outbound;
1604 if (n->bw_out.value__ != GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1605 n->bw_out_external_limit).value__)
1607 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1608 n->bw_out_external_limit);
1609 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1611 GNUNET_TRANSPORT_set_quota (transport,
1615 GNUNET_TIME_UNIT_FOREVER_REL,
1617 handle_peer_status_change (n);
1620 if (want_reserv < 0)
1622 got_reserv = want_reserv;
1624 else if (want_reserv > 0)
1626 rdelay = GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1628 if (rdelay.rel_value == 0)
1629 got_reserv = want_reserv;
1631 got_reserv = 0; /* all or nothing */
1635 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1637 old_preference = n->current_preference;
1638 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1639 if (old_preference > n->current_preference)
1641 /* overflow; cap at maximum value */
1642 n->current_preference = ULLONG_MAX;
1644 update_preference_sum (n->current_preference - old_preference);
1645 #if DEBUG_CORE_QUOTA
1646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1647 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1649 GNUNET_i2s (&rcm->peer),
1652 cim.reserved_amount = htonl (got_reserv);
1653 cim.reserve_delay = GNUNET_TIME_relative_hton (rdelay);
1654 cim.rim_id = rcm->rim_id;
1655 cim.bw_out = n->bw_out;
1656 cim.preference = n->current_preference;
1658 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1659 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1660 cim.peer = rcm->peer;
1661 #if DEBUG_CORE_CLIENT
1662 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1663 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1665 send_to_client (pos, &cim.header, GNUNET_NO);
1666 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1671 * Free the given entry for the neighbour (it has
1672 * already been removed from the list at this point).
1674 * @param n neighbour to free
1677 free_neighbour (struct Neighbour *n)
1679 struct MessageEntry *m;
1680 struct ClientActiveRequest *car;
1683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1684 "Destroying neighbour entry for peer `%4s'\n",
1685 GNUNET_i2s (&n->peer));
1687 if (n->pitr != NULL)
1689 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1694 GNUNET_free (n->skm);
1697 while (NULL != (m = n->messages))
1699 n->messages = m->next;
1702 while (NULL != (m = n->encrypted_head))
1704 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1709 while (NULL != (car = n->active_client_request_head))
1711 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1712 n->active_client_request_tail,
1714 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
1715 &n->peer.hashPubKey,
1721 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1724 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1725 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
1726 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1727 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
1728 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1729 GNUNET_SCHEDULER_cancel (n->quota_update_task);
1730 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1731 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1732 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1733 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
1734 if (n->status == PEER_STATE_KEY_CONFIRMED)
1735 GNUNET_STATISTICS_update (stats,
1736 gettext_noop ("# established sessions"),
1739 GNUNET_array_grow (n->ats, n->ats_count, 0);
1740 GNUNET_free_non_null (n->public_key);
1741 GNUNET_free_non_null (n->pending_ping);
1742 GNUNET_free_non_null (n->pending_pong);
1748 * Check if we have encrypted messages for the specified neighbour
1749 * pending, and if so, check with the transport about sending them
1752 * @param n neighbour to check.
1754 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1758 * Encrypt size bytes from in and write the result to out. Use the
1759 * key for outbound traffic of the given neighbour.
1761 * @param n neighbour we are sending to
1762 * @param iv initialization vector to use
1763 * @param in ciphertext
1764 * @param out plaintext
1765 * @param size size of in/out
1766 * @return GNUNET_OK on success
1769 do_encrypt (struct Neighbour *n,
1770 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1771 const void *in, void *out, size_t size)
1773 if (size != (uint16_t) size)
1778 GNUNET_assert (size ==
1779 GNUNET_CRYPTO_aes_encrypt (in,
1783 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1785 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1786 "Encrypted %u bytes for `%4s' using key %u, IV %u\n",
1787 (unsigned int) size,
1788 GNUNET_i2s (&n->peer),
1789 (unsigned int) n->encrypt_key.crc32,
1790 GNUNET_CRYPTO_crc32_n (iv, sizeof(iv)));
1797 * Consider freeing the given neighbour since we may not need
1798 * to keep it around anymore.
1800 * @param n neighbour to consider discarding
1803 consider_free_neighbour (struct Neighbour *n);
1807 * Task triggered when a neighbour entry is about to time out
1808 * (and we should prevent this by sending a PING).
1810 * @param cls the 'struct Neighbour'
1811 * @param tc scheduler context (not used)
1814 send_keep_alive (void *cls,
1815 const struct GNUNET_SCHEDULER_TaskContext *tc)
1817 struct Neighbour *n = cls;
1818 struct GNUNET_TIME_Relative retry;
1819 struct GNUNET_TIME_Relative left;
1820 struct MessageEntry *me;
1821 struct PingMessage pp;
1822 struct PingMessage *pm;
1823 struct GNUNET_CRYPTO_AesInitializationVector iv;
1825 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1827 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1828 sizeof (struct PingMessage));
1829 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1830 me->priority = PING_PRIORITY;
1831 me->size = sizeof (struct PingMessage);
1832 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1836 pm = (struct PingMessage *) &me[1];
1837 pm->header.size = htons (sizeof (struct PingMessage));
1838 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1839 pm->iv_seed = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1841 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
1842 pp.challenge = n->ping_challenge;
1843 pp.target = n->peer;
1845 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1846 "Encrypting `%s' message with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
1848 (unsigned int) n->ping_challenge,
1849 GNUNET_i2s (&n->peer),
1850 (unsigned int) n->encrypt_key.crc32,
1851 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
1858 sizeof (struct PingMessage) -
1859 ((void *) &pm->target - (void *) pm));
1860 process_encrypted_neighbour_queue (n);
1861 /* reschedule PING job */
1862 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1863 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1864 MIN_PING_FREQUENCY);
1866 = GNUNET_SCHEDULER_add_delayed (retry,
1874 * Task triggered when a neighbour entry might have gotten stale.
1876 * @param cls the 'struct Neighbour'
1877 * @param tc scheduler context (not used)
1880 consider_free_task (void *cls,
1881 const struct GNUNET_SCHEDULER_TaskContext *tc)
1883 struct Neighbour *n = cls;
1885 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1886 consider_free_neighbour (n);
1891 * Consider freeing the given neighbour since we may not need
1892 * to keep it around anymore.
1894 * @param n neighbour to consider discarding
1897 consider_free_neighbour (struct Neighbour *n)
1899 struct GNUNET_TIME_Relative left;
1901 if ( (n->th != NULL) ||
1902 (n->pitr != NULL) ||
1903 (GNUNET_YES == n->is_connected) )
1904 return; /* no chance */
1906 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1907 if (left.rel_value > 0)
1909 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1910 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1911 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (left,
1912 &consider_free_task,
1916 /* actually free the neighbour... */
1917 GNUNET_assert (GNUNET_OK ==
1918 GNUNET_CONTAINER_multihashmap_remove (neighbours,
1919 &n->peer.hashPubKey,
1921 GNUNET_STATISTICS_set (stats,
1922 gettext_noop ("# neighbour entries allocated"),
1923 GNUNET_CONTAINER_multihashmap_size (neighbours),
1930 * Function called when the transport service is ready to
1931 * receive an encrypted message for the respective peer
1933 * @param cls neighbour to use message from
1934 * @param size number of bytes we can transmit
1935 * @param buf where to copy the message
1936 * @return number of bytes transmitted
1939 notify_encrypted_transmit_ready (void *cls,
1943 struct Neighbour *n = cls;
1944 struct MessageEntry *m;
1949 m = n->encrypted_head;
1953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1954 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1955 GNUNET_i2s (&n->peer));
1959 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1966 GNUNET_assert (size >= m->size);
1967 memcpy (cbuf, &m[1], m->size);
1969 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1972 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1973 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1974 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1976 GNUNET_i2s (&n->peer));
1978 process_encrypted_neighbour_queue (n);
1983 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1984 "Transmission of message of type %u and size %u failed\n",
1985 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1986 (unsigned int) m->size);
1990 consider_free_neighbour (n);
1991 GNUNET_STATISTICS_update (stats,
1992 gettext_noop ("# encrypted bytes given to transport"),
2000 * Check if we have plaintext messages for the specified neighbour
2001 * pending, and if so, consider batching and encrypting them (and
2002 * then trigger processing of the encrypted queue if needed).
2004 * @param n neighbour to check.
2006 static void process_plaintext_neighbour_queue (struct Neighbour *n);
2010 * Check if we have encrypted messages for the specified neighbour
2011 * pending, and if so, check with the transport about sending them
2014 * @param n neighbour to check.
2017 process_encrypted_neighbour_queue (struct Neighbour *n)
2019 struct MessageEntry *m;
2022 return; /* request already pending */
2023 m = n->encrypted_head;
2026 /* encrypted queue empty, try plaintext instead */
2027 process_plaintext_neighbour_queue (n);
2031 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2032 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
2033 (unsigned int) m->size,
2034 GNUNET_i2s (&n->peer),
2035 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
2038 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
2041 GNUNET_TIME_absolute_get_remaining
2043 ¬ify_encrypted_transmit_ready,
2047 /* message request too large or duplicate request */
2049 /* discard encrypted message */
2050 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
2054 process_encrypted_neighbour_queue (n);
2060 * Decrypt size bytes from in and write the result to out. Use the
2061 * key for inbound traffic of the given neighbour. This function does
2062 * NOT do any integrity-checks on the result.
2064 * @param n neighbour we are receiving from
2065 * @param iv initialization vector to use
2066 * @param in ciphertext
2067 * @param out plaintext
2068 * @param size size of in/out
2069 * @return GNUNET_OK on success
2072 do_decrypt (struct Neighbour *n,
2073 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
2074 const void *in, void *out, size_t size)
2076 if (size != (uint16_t) size)
2081 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
2082 (n->status != PEER_STATE_KEY_CONFIRMED))
2084 GNUNET_break_op (0);
2085 return GNUNET_SYSERR;
2088 GNUNET_CRYPTO_aes_decrypt (in,
2095 return GNUNET_SYSERR;
2097 GNUNET_STATISTICS_update (stats,
2098 gettext_noop ("# bytes decrypted"),
2102 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2103 "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
2104 (unsigned int) size,
2105 GNUNET_i2s (&n->peer),
2106 (unsigned int) n->decrypt_key.crc32,
2107 GNUNET_CRYPTO_crc32_n (iv, sizeof(*iv)));
2114 * Select messages for transmission. This heuristic uses a combination
2115 * of earliest deadline first (EDF) scheduling (with bounded horizon)
2116 * and priority-based discard (in case no feasible schedule exist) and
2117 * speculative optimization (defer any kind of transmission until
2118 * we either create a batch of significant size, 25% of max, or until
2119 * we are close to a deadline). Furthermore, when scheduling the
2120 * heuristic also packs as many messages into the batch as possible,
2121 * starting with those with the earliest deadline. Yes, this is fun.
2123 * @param n neighbour to select messages from
2124 * @param size number of bytes to select for transmission
2125 * @param retry_time set to the time when we should try again
2126 * (only valid if this function returns zero)
2127 * @return number of bytes selected, or 0 if we decided to
2128 * defer scheduling overall; in that case, retry_time is set.
2131 select_messages (struct Neighbour *n,
2132 size_t size, struct GNUNET_TIME_Relative *retry_time)
2134 struct MessageEntry *pos;
2135 struct MessageEntry *min;
2136 struct MessageEntry *last;
2137 unsigned int min_prio;
2138 struct GNUNET_TIME_Absolute t;
2139 struct GNUNET_TIME_Absolute now;
2140 struct GNUNET_TIME_Relative delta;
2142 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
2145 unsigned int queue_size;
2146 int discard_low_prio;
2148 GNUNET_assert (NULL != n->messages);
2149 now = GNUNET_TIME_absolute_get ();
2150 /* last entry in linked list of messages processed */
2152 /* should we remove the entry with the lowest
2153 priority from consideration for scheduling at the
2164 discard_low_prio = GNUNET_YES;
2165 while (GNUNET_YES == discard_low_prio)
2168 min_prio = UINT_MAX;
2169 discard_low_prio = GNUNET_NO;
2170 /* calculate number of bytes available for transmission at time "t" */
2171 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
2173 /* how many bytes have we (hypothetically) scheduled so far */
2175 /* maximum time we can wait before transmitting anything
2176 and still make all of our deadlines */
2177 slack = GNUNET_TIME_UNIT_FOREVER_REL;
2179 /* note that we use "*2" here because we want to look
2180 a bit further into the future; much more makes no
2181 sense since new message might be scheduled in the
2183 while ((pos != NULL) && (off < size * 2))
2185 if (pos->do_transmit == GNUNET_YES)
2187 /* already removed from consideration */
2191 if (discard_low_prio == GNUNET_NO)
2193 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
2194 if (delta.rel_value > 0)
2196 // FIXME: HUH? Check!
2198 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
2201 if (avail < pos->size)
2203 // FIXME: HUH? Check!
2204 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
2209 /* update slack, considering both its absolute deadline
2210 and relative deadlines caused by other messages
2211 with their respective load */
2212 slack = GNUNET_TIME_relative_min (slack,
2213 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
2215 if (pos->deadline.abs_value <= now.abs_value)
2218 slack = GNUNET_TIME_UNIT_ZERO;
2220 else if (GNUNET_YES == pos->got_slack)
2222 /* should be soon now! */
2223 slack = GNUNET_TIME_relative_min (slack,
2224 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
2229 GNUNET_TIME_relative_min (slack,
2230 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
2231 pos->got_slack = GNUNET_YES;
2232 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
2233 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
2238 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
2239 if (pos->priority <= min_prio)
2241 /* update min for discard */
2242 min_prio = pos->priority;
2247 if (discard_low_prio)
2249 GNUNET_assert (min != NULL);
2250 /* remove lowest-priority entry from consideration */
2251 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
2255 /* guard against sending "tiny" messages with large headers without
2257 if ( (slack.rel_value > GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value) &&
2259 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
2261 /* less than 25% of message would be filled with deadlines still
2262 being met if we delay by one second or more; so just wait for
2263 more data; but do not wait longer than 1s (since we don't want
2264 to delay messages for a really long time either). */
2265 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
2266 /* reset do_transmit values for next time */
2269 pos->do_transmit = GNUNET_NO;
2272 GNUNET_STATISTICS_update (stats,
2273 gettext_noop ("# transmissions delayed due to corking"),
2276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2277 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
2278 (unsigned long long) retry_time->rel_value,
2280 (unsigned int) size);
2284 /* select marked messages (up to size) for transmission */
2289 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
2291 pos->do_transmit = GNUNET_YES; /* mark for transmission */
2295 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2296 "Selecting message of size %u for transmission\n",
2297 (unsigned int) pos->size);
2303 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2304 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
2305 (unsigned int) pos->size,
2308 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
2313 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2314 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
2315 (unsigned long long) off, (unsigned long long) tsize,
2316 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
2317 GNUNET_i2s (&n->peer));
2324 * Batch multiple messages into a larger buffer.
2326 * @param n neighbour to take messages from
2327 * @param buf target buffer
2328 * @param size size of buf
2329 * @param deadline set to transmission deadline for the result
2330 * @param retry_time set to the time when we should try again
2331 * (only valid if this function returns zero)
2332 * @param priority set to the priority of the batch
2333 * @return number of bytes written to buf (can be zero)
2336 batch_message (struct Neighbour *n,
2339 struct GNUNET_TIME_Absolute *deadline,
2340 struct GNUNET_TIME_Relative *retry_time,
2341 unsigned int *priority)
2343 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
2344 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
2345 struct MessageEntry *pos;
2346 struct MessageEntry *prev;
2347 struct MessageEntry *next;
2352 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2353 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
2354 if (0 == select_messages (n, size, retry_time))
2357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2358 "No messages selected, will try again in %llu ms\n",
2359 retry_time->rel_value);
2363 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
2364 ntm->ats_count = htonl (0);
2365 ntm->ats.type = htonl (0);
2366 ntm->ats.value = htonl (0);
2367 ntm->peer = n->peer;
2370 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
2373 if (GNUNET_YES == pos->do_transmit)
2375 GNUNET_assert (pos->size <= size);
2376 /* do notifications */
2377 /* FIXME: track if we have *any* client that wants
2378 full notifications and only do this if that is
2380 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
2382 memcpy (&ntm[1], &pos[1], pos->size);
2383 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2384 sizeof (struct GNUNET_MessageHeader));
2385 send_to_all_clients (&ntm->header,
2387 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
2391 /* message too large for 'full' notifications, we do at
2392 least the 'hdr' type */
2395 sizeof (struct GNUNET_MessageHeader));
2397 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2399 send_to_all_clients (&ntm->header,
2401 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
2403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2404 "Encrypting %u bytes with message of type %u and size %u\n",
2406 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
2407 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
2409 /* copy for encrypted transmission */
2410 memcpy (&buf[ret], &pos[1], pos->size);
2413 *priority += pos->priority;
2415 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2416 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
2417 (unsigned int) pos->size,
2418 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).rel_value);
2420 deadline->abs_value = GNUNET_MIN (deadline->abs_value, pos->deadline.abs_value);
2434 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2435 "Deadline for message batch is %llu ms\n",
2436 GNUNET_TIME_absolute_get_remaining (*deadline).rel_value);
2443 * Remove messages with deadlines that have long expired from
2446 * @param n neighbour to inspect
2449 discard_expired_messages (struct Neighbour *n)
2451 struct MessageEntry *prev;
2452 struct MessageEntry *next;
2453 struct MessageEntry *pos;
2454 struct GNUNET_TIME_Absolute now;
2455 struct GNUNET_TIME_Relative delta;
2459 now = GNUNET_TIME_absolute_get ();
2465 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
2466 if (delta.rel_value > PAST_EXPIRATION_DISCARD_TIME.rel_value)
2469 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2470 "Message is %llu ms past due, discarding.\n",
2477 GNUNET_STATISTICS_update (stats,
2478 gettext_noop ("# messages discarded (expired prior to transmission)"),
2488 if (GNUNET_YES == disc)
2489 schedule_peer_messages (n);
2494 * Signature of the main function of a task.
2496 * @param cls closure
2497 * @param tc context information (why was this task triggered now)
2500 retry_plaintext_processing (void *cls,
2501 const struct GNUNET_SCHEDULER_TaskContext *tc)
2503 struct Neighbour *n = cls;
2505 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2506 process_plaintext_neighbour_queue (n);
2511 * Send our key (and encrypted PING) to the other peer.
2513 * @param n the other peer
2515 static void send_key (struct Neighbour *n);
2518 * Task that will retry "send_key" if our previous attempt failed
2522 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2524 struct Neighbour *n = cls;
2527 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2528 "Retrying key transmission to `%4s'\n",
2529 GNUNET_i2s (&n->peer));
2531 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2532 n->set_key_retry_frequency =
2533 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
2539 * Check if we have plaintext messages for the specified neighbour
2540 * pending, and if so, consider batching and encrypting them (and
2541 * then trigger processing of the encrypted queue if needed).
2543 * @param n neighbour to check.
2546 process_plaintext_neighbour_queue (struct Neighbour *n)
2548 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
2550 struct EncryptedMessage *em; /* encrypted message */
2551 struct EncryptedMessage *ph; /* plaintext header */
2552 struct MessageEntry *me;
2553 unsigned int priority;
2554 struct GNUNET_TIME_Absolute deadline;
2555 struct GNUNET_TIME_Relative retry_time;
2556 struct GNUNET_CRYPTO_AesInitializationVector iv;
2557 struct GNUNET_CRYPTO_AuthKey auth_key;
2559 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
2561 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
2562 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2566 case PEER_STATE_DOWN:
2569 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2570 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2571 GNUNET_i2s(&n->peer));
2574 case PEER_STATE_KEY_SENT:
2575 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2576 n->retry_set_key_task
2577 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2578 &set_key_retry_task, n);
2580 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2581 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2582 GNUNET_i2s(&n->peer));
2585 case PEER_STATE_KEY_RECEIVED:
2586 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2587 n->retry_set_key_task
2588 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2589 &set_key_retry_task, n);
2591 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2592 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2593 GNUNET_i2s(&n->peer));
2596 case PEER_STATE_KEY_CONFIRMED:
2597 /* ready to continue */
2600 discard_expired_messages (n);
2601 if (n->messages == NULL)
2604 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2605 "Plaintext message queue for `%4s' is empty.\n",
2606 GNUNET_i2s(&n->peer));
2608 return; /* no pending messages */
2610 if (n->encrypted_head != NULL)
2613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2614 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2615 GNUNET_i2s(&n->peer));
2617 return; /* wait for messages already encrypted to be
2620 ph = (struct EncryptedMessage *) pbuf;
2621 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2623 used = sizeof (struct EncryptedMessage);
2624 used += batch_message (n,
2626 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2627 &deadline, &retry_time, &priority);
2628 if (used == sizeof (struct EncryptedMessage))
2631 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2632 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2633 GNUNET_i2s(&n->peer));
2635 /* no messages selected for sending, try again later... */
2636 n->retry_plaintext_task =
2637 GNUNET_SCHEDULER_add_delayed (retry_time,
2638 &retry_plaintext_processing, n);
2641 #if DEBUG_CORE_QUOTA
2642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2643 "Sending %u b/s as new limit to peer `%4s'\n",
2644 (unsigned int) ntohl (n->bw_in.value__),
2645 GNUNET_i2s (&n->peer));
2647 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
2648 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2649 ph->inbound_bw_limit = n->bw_in;
2650 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2652 /* setup encryption message header */
2653 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2654 me->deadline = deadline;
2655 me->priority = priority;
2657 em = (struct EncryptedMessage *) &me[1];
2658 em->header.size = htons (used);
2659 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2660 em->iv_seed = ph->iv_seed;
2661 derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
2664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2665 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2666 (unsigned int) used - ENCRYPTED_HEADER_SIZE,
2667 GNUNET_i2s(&n->peer),
2668 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).rel_value);
2670 GNUNET_assert (GNUNET_OK ==
2673 &ph->sequence_number,
2674 &em->sequence_number, used - ENCRYPTED_HEADER_SIZE));
2675 derive_auth_key (&auth_key,
2678 n->encrypt_key_created);
2679 GNUNET_CRYPTO_hmac (&auth_key,
2680 &em->sequence_number,
2681 used - ENCRYPTED_HEADER_SIZE,
2684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2685 "Authenticated %u bytes of ciphertext %u: `%s'\n",
2686 used - ENCRYPTED_HEADER_SIZE,
2687 GNUNET_CRYPTO_crc32_n (&em->sequence_number,
2688 used - ENCRYPTED_HEADER_SIZE),
2689 GNUNET_h2s (&em->hmac));
2691 /* append to transmission list */
2692 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2696 process_encrypted_neighbour_queue (n);
2697 schedule_peer_messages (n);
2702 * Function that recalculates the bandwidth quota for the
2703 * given neighbour and transmits it to the transport service.
2705 * @param cls neighbour for the quota update
2709 neighbour_quota_update (void *cls,
2710 const struct GNUNET_SCHEDULER_TaskContext *tc);
2714 * Schedule the task that will recalculate the bandwidth
2715 * quota for this peer (and possibly force a disconnect of
2716 * idle peers by calculating a bandwidth of zero).
2719 schedule_quota_update (struct Neighbour *n)
2721 GNUNET_assert (n->quota_update_task ==
2722 GNUNET_SCHEDULER_NO_TASK);
2723 n->quota_update_task
2724 = GNUNET_SCHEDULER_add_delayed (QUOTA_UPDATE_FREQUENCY,
2725 &neighbour_quota_update,
2731 * Initialize a new 'struct Neighbour'.
2733 * @param pid ID of the new neighbour
2734 * @return handle for the new neighbour
2736 static struct Neighbour *
2737 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2739 struct Neighbour *n;
2740 struct GNUNET_TIME_Absolute now;
2743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2744 "Creating neighbour entry for peer `%4s'\n",
2747 n = GNUNET_malloc (sizeof (struct Neighbour));
2749 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2750 now = GNUNET_TIME_absolute_get ();
2751 n->encrypt_key_created = now;
2752 n->last_activity = now;
2753 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2754 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2755 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2756 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2757 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2758 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
2760 GNUNET_assert (GNUNET_OK ==
2761 GNUNET_CONTAINER_multihashmap_put (neighbours,
2762 &n->peer.hashPubKey,
2764 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2765 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
2766 GNUNET_CONTAINER_multihashmap_size (neighbours), GNUNET_NO);
2767 neighbour_quota_update (n, NULL);
2768 consider_free_neighbour (n);
2774 * Handle CORE_SEND request.
2777 * @param client the client issuing the request
2778 * @param message the "struct SendMessage"
2781 handle_client_send (void *cls,
2782 struct GNUNET_SERVER_Client *client,
2783 const struct GNUNET_MessageHeader *message)
2785 const struct SendMessage *sm;
2786 struct Neighbour *n;
2787 struct MessageEntry *prev;
2788 struct MessageEntry *pos;
2789 struct MessageEntry *e;
2790 struct MessageEntry *min_prio_entry;
2791 struct MessageEntry *min_prio_prev;
2792 unsigned int min_prio;
2793 unsigned int queue_size;
2796 msize = ntohs (message->size);
2798 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2800 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));
2803 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2806 sm = (const struct SendMessage *) message;
2807 msize -= sizeof (struct SendMessage);
2808 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2811 GNUNET_SERVER_mst_receive (mst,
2813 (const char*) &sm[1],
2818 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2821 n = find_neighbour (&sm->peer);
2823 n = create_neighbour (&sm->peer);
2825 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2826 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2828 (unsigned int) msize,
2829 GNUNET_i2s (&sm->peer));
2831 discard_expired_messages (n);
2832 /* bound queue size */
2833 /* NOTE: this entire block to bound the queue size should be
2834 obsolete with the new client-request code and the
2835 'schedule_peer_messages' mechanism; we still have this code in
2836 here for now as a sanity check for the new mechanmism;
2837 ultimately, we should probably simply reject SEND messages that
2838 are not 'approved' (or provide a new core API for very unreliable
2839 delivery that always sends with priority 0). Food for thought. */
2840 min_prio = UINT32_MAX;
2841 min_prio_entry = NULL;
2842 min_prio_prev = NULL;
2848 if (pos->priority <= min_prio)
2850 min_prio_entry = pos;
2851 min_prio_prev = prev;
2852 min_prio = pos->priority;
2858 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2861 if (ntohl(sm->priority) <= min_prio)
2863 /* discard new entry; this should no longer happen! */
2866 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2867 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2869 (unsigned int) MAX_PEER_QUEUE_SIZE,
2870 (unsigned int) msize,
2871 (unsigned int) ntohs (message->type));
2873 GNUNET_STATISTICS_update (stats,
2874 gettext_noop ("# discarded CORE_SEND requests"),
2878 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2881 GNUNET_assert (min_prio_entry != NULL);
2882 /* discard "min_prio_entry" */
2884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2885 "Queue full, discarding existing older request\n");
2887 GNUNET_STATISTICS_update (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 1, GNUNET_NO);
2888 if (min_prio_prev == NULL)
2889 n->messages = min_prio_entry->next;
2891 min_prio_prev->next = min_prio_entry->next;
2892 GNUNET_free (min_prio_entry);
2896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2897 "Adding transmission request for `%4s' of size %u to queue\n",
2898 GNUNET_i2s (&sm->peer),
2899 (unsigned int) msize);
2901 GNUNET_break (0 == ntohl (sm->reserved));
2902 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2903 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2904 e->priority = ntohl (sm->priority);
2906 if (GNUNET_YES != (int) ntohl (sm->cork))
2907 e->got_slack = GNUNET_YES;
2908 memcpy (&e[1], &sm[1], msize);
2910 /* insert, keep list sorted by deadline */
2913 while ((pos != NULL) && (pos->deadline.abs_value < e->deadline.abs_value))
2924 /* consider scheduling now */
2925 process_plaintext_neighbour_queue (n);
2927 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2932 * Function called when the transport service is ready to
2933 * receive a message. Only resets 'n->th' to NULL.
2935 * @param cls neighbour to use message from
2936 * @param size number of bytes we can transmit
2937 * @param buf where to copy the message
2938 * @return number of bytes transmitted
2941 notify_transport_connect_done (void *cls,
2945 struct Neighbour *n = cls;
2948 if (GNUNET_YES != n->is_connected)
2950 /* transport should only call us to transmit a message after
2951 * telling us about a successful connection to the respective peer */
2953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2954 "Timeout on notify connect!\n");
2956 GNUNET_STATISTICS_update (stats,
2957 gettext_noop ("# connection requests timed out in transport"),
2964 GNUNET_STATISTICS_update (stats,
2965 gettext_noop ("# connection requests timed out in transport"),
2968 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2969 _("Failed to connect to `%4s': transport failed to connect\n"),
2970 GNUNET_i2s (&n->peer));
2973 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2974 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2975 GNUNET_i2s (&n->peer));
2976 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2977 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2978 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (&set_key_retry_task,
2985 * Handle CORE_REQUEST_CONNECT request.
2988 * @param client the client issuing the request
2989 * @param message the "struct ConnectMessage"
2992 handle_client_request_connect (void *cls,
2993 struct GNUNET_SERVER_Client *client,
2994 const struct GNUNET_MessageHeader *message)
2996 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2997 struct Neighbour *n;
2998 struct GNUNET_TIME_Relative timeout;
3000 if (0 == memcmp (&cm->peer,
3002 sizeof (struct GNUNET_PeerIdentity)))
3004 /* In this case a client has asked us to connect to ourselves, not really an error! */
3005 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3008 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
3009 GNUNET_break (ntohl (cm->reserved) == 0);
3010 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3011 n = find_neighbour (&cm->peer);
3013 n = create_neighbour (&cm->peer);
3014 if ( (GNUNET_YES == n->is_connected) ||
3017 if (GNUNET_YES == n->is_connected)
3018 GNUNET_STATISTICS_update (stats,
3019 gettext_noop ("# connection requests ignored (already connected)"),
3024 GNUNET_TRANSPORT_notify_transmit_ready_cancel(n->th);
3025 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3027 sizeof (struct GNUNET_MessageHeader), 0,
3029 ¬ify_transport_connect_done,
3031 GNUNET_break (NULL != n->th);
3032 GNUNET_STATISTICS_update (stats,
3033 gettext_noop ("# connection requests retried (due to repeat request connect)"),
3037 return; /* already connected, or at least trying */
3039 GNUNET_STATISTICS_update (stats,
3040 gettext_noop ("# connection requests received"),
3045 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3046 "Core received `%s' request for `%4s', will try to establish connection\n",
3048 GNUNET_i2s (&cm->peer));
3051 /* ask transport to connect to the peer */
3052 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3054 sizeof (struct GNUNET_MessageHeader), 0,
3056 ¬ify_transport_connect_done,
3058 GNUNET_break (NULL != n->th);
3063 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3064 * the neighbour's struct and retry send_key. Or, if we did not get a
3065 * HELLO, just do nothing.
3067 * @param cls the 'struct Neighbour' to retry sending the key for
3068 * @param peer the peer for which this is the HELLO
3069 * @param hello HELLO message of that peer
3070 * @param err_msg NULL if successful, otherwise contains error message
3073 process_hello_retry_send_key (void *cls,
3074 const struct GNUNET_PeerIdentity *peer,
3075 const struct GNUNET_HELLO_Message *hello,
3076 const char *err_msg)
3078 struct Neighbour *n = cls;
3080 if (err_msg != NULL)
3082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3083 _("Error in communication with PEERINFO service\n"));
3090 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3091 "Entered `%s' and `%s' is NULL!\n",
3092 "process_hello_retry_send_key",
3096 if (n->public_key != NULL)
3098 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3100 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3101 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3103 GNUNET_STATISTICS_update (stats,
3104 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3113 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
3114 GNUNET_i2s (&n->peer));
3116 GNUNET_STATISTICS_update (stats,
3117 gettext_noop ("# Delayed connecting due to lack of public key"),
3120 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
3121 n->retry_set_key_task
3122 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3123 &set_key_retry_task, n);
3129 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3130 "Entered `%s' for peer `%4s'\n",
3131 "process_hello_retry_send_key",
3134 if (n->public_key != NULL)
3136 /* already have public key, why are we here? */
3142 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3143 "Received new `%s' message for `%4s', initiating key exchange.\n",
3148 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3149 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3151 GNUNET_STATISTICS_update (stats,
3152 gettext_noop ("# Error extracting public key from HELLO"),
3155 GNUNET_free (n->public_key);
3156 n->public_key = NULL;
3158 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3159 "GNUNET_HELLO_get_key returned awfully\n");
3167 * Send our key (and encrypted PING) to the other peer.
3169 * @param n the other peer
3172 send_key (struct Neighbour *n)
3174 struct MessageEntry *pos;
3175 struct SetKeyMessage *sm;
3176 struct MessageEntry *me;
3177 struct PingMessage pp;
3178 struct PingMessage *pm;
3179 struct GNUNET_CRYPTO_AesInitializationVector iv;
3181 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3183 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3184 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3186 if (n->pitr != NULL)
3189 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3190 "Key exchange in progress with `%4s'.\n",
3191 GNUNET_i2s (&n->peer));
3193 return; /* already in progress */
3195 if (GNUNET_YES != n->is_connected)
3198 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3199 "Not yet connected to peer `%4s'!\n",
3200 GNUNET_i2s (&n->peer));
3204 GNUNET_STATISTICS_update (stats,
3205 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
3208 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3210 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
3212 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3213 ¬ify_encrypted_transmit_ready,
3219 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3220 "Asked to perform key exchange with `%4s'.\n",
3221 GNUNET_i2s (&n->peer));
3223 if (n->public_key == NULL)
3225 /* lookup n's public key, then try again */
3227 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3228 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
3229 GNUNET_i2s (&n->peer));
3231 GNUNET_assert (n->pitr == NULL);
3232 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3234 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
3235 &process_hello_retry_send_key, n);
3238 pos = n->encrypted_head;
3241 if (GNUNET_YES == pos->is_setkey)
3243 if (pos->sender_status == n->status)
3246 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3247 "`%s' message for `%4s' queued already\n",
3249 GNUNET_i2s (&n->peer));
3251 goto trigger_processing;
3253 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
3258 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3259 "Removing queued `%s' message for `%4s', will create a new one\n",
3261 GNUNET_i2s (&n->peer));
3271 case PEER_STATE_DOWN:
3272 n->status = PEER_STATE_KEY_SENT;
3274 case PEER_STATE_KEY_SENT:
3276 case PEER_STATE_KEY_RECEIVED:
3278 case PEER_STATE_KEY_CONFIRMED:
3286 /* first, set key message */
3287 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3288 sizeof (struct SetKeyMessage) +
3289 sizeof (struct PingMessage));
3290 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
3291 me->priority = SET_KEY_PRIORITY;
3292 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
3293 me->is_setkey = GNUNET_YES;
3294 me->got_slack = GNUNET_YES; /* do not defer this one! */
3295 me->sender_status = n->status;
3296 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3300 sm = (struct SetKeyMessage *) &me[1];
3301 sm->header.size = htons (sizeof (struct SetKeyMessage));
3302 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
3303 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
3304 PEER_STATE_KEY_SENT : n->status));
3306 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3307 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3308 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3309 sizeof (struct GNUNET_PeerIdentity));
3310 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
3311 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
3312 sm->target = n->peer;
3313 GNUNET_assert (GNUNET_OK ==
3314 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
3316 GNUNET_CRYPTO_AesSessionKey),
3318 &sm->encrypted_key));
3319 GNUNET_assert (GNUNET_OK ==
3320 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
3322 pm = (struct PingMessage *) &sm[1];
3323 pm->header.size = htons (sizeof (struct PingMessage));
3324 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
3325 pm->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3326 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
3327 pp.challenge = n->ping_challenge;
3328 pp.target = n->peer;
3330 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3331 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
3333 (unsigned int) n->ping_challenge,
3334 GNUNET_i2s (&n->peer),
3335 (unsigned int) n->encrypt_key.crc32,
3336 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3343 sizeof (struct PingMessage) -
3344 ((void *) &pm->target - (void *) pm));
3345 GNUNET_STATISTICS_update (stats,
3346 gettext_noop ("# SET_KEY and PING messages created"),
3350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3351 "Have %llu ms left for `%s' transmission.\n",
3352 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).rel_value,
3356 /* trigger queue processing */
3357 process_encrypted_neighbour_queue (n);
3358 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
3359 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
3360 n->retry_set_key_task
3361 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3362 &set_key_retry_task, n);
3367 * We received a SET_KEY message. Validate and update
3368 * our key material and status.
3370 * @param n the neighbour from which we received message m
3371 * @param m the set key message we received
3372 * @param ats performance data
3373 * @param ats_count number of entries in ats (excluding 0-termination)
3376 handle_set_key (struct Neighbour *n,
3377 const struct SetKeyMessage *m,
3378 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3379 uint32_t ats_count);
3384 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3385 * the neighbour's struct and retry handling the set_key message. Or,
3386 * if we did not get a HELLO, just free the set key message.
3388 * @param cls pointer to the set key message
3389 * @param peer the peer for which this is the HELLO
3390 * @param hello HELLO message of that peer
3391 * @param err_msg NULL if successful, otherwise contains error message
3394 process_hello_retry_handle_set_key (void *cls,
3395 const struct GNUNET_PeerIdentity *peer,
3396 const struct GNUNET_HELLO_Message *hello,
3397 const char *err_msg)
3399 struct Neighbour *n = cls;
3400 struct SetKeyMessage *sm = n->skm;
3402 if (err_msg != NULL)
3404 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3405 _("Error in communication with PEERINFO service\n"));
3413 if (n->public_key != NULL)
3416 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3417 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
3419 GNUNET_i2s (&n->peer),
3422 handle_set_key (n, sm, NULL, 0);
3426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3427 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
3429 GNUNET_i2s (&n->peer));
3434 if (n->public_key != NULL)
3435 return; /* multiple HELLOs match!? */
3437 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3438 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3440 GNUNET_break_op (0);
3441 GNUNET_free (n->public_key);
3442 n->public_key = NULL;
3448 * Merge the given performance data with the data we currently
3449 * track for the given neighbour.
3451 * @param n neighbour
3452 * @param ats new performance data
3453 * @param ats_count number of records in ats
3456 update_neighbour_performance (struct Neighbour *n,
3457 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3465 for (i = 0; i < ats_count; i++)
3467 for (j=0;j < n->ats_count; j++)
3469 if (n->ats[j].type == ats[i].type)
3471 n->ats[j].value = ats[i].value;
3475 if (j == n->ats_count)
3477 GNUNET_array_append (n->ats,
3486 * We received a PING message. Validate and transmit
3489 * @param n sender of the PING
3490 * @param m the encrypted PING message itself
3491 * @param ats performance data
3492 * @param ats_count number of entries in ats (excluding 0-termination)
3495 handle_ping (struct Neighbour *n,
3496 const struct PingMessage *m,
3497 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3500 struct PingMessage t;
3501 struct PongMessage tx;
3502 struct PongMessage *tp;
3503 struct MessageEntry *me;
3504 struct GNUNET_CRYPTO_AesInitializationVector iv;
3507 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3508 "Core service receives `%s' request from `%4s'.\n",
3509 "PING", GNUNET_i2s (&n->peer));
3511 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3517 sizeof (struct PingMessage) -
3518 ((void *) &m->target - (void *) m)))
3521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3522 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
3524 GNUNET_i2s (&t.target),
3525 (unsigned int) t.challenge,
3526 (unsigned int) n->decrypt_key.crc32,
3527 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3530 GNUNET_STATISTICS_update (stats,
3531 gettext_noop ("# PING messages decrypted"),
3534 if (0 != memcmp (&t.target,
3535 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3538 GNUNET_asprintf(&peer, "%s",GNUNET_i2s (&t.target));
3539 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3540 "Received PING for different identity : I am %s, PONG identity: %s\n",GNUNET_i2s (&my_identity), peer );
3542 GNUNET_break_op (0);
3545 update_neighbour_performance (n, ats, ats_count);
3546 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3547 sizeof (struct PongMessage));
3548 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3552 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
3553 me->priority = PONG_PRIORITY;
3554 me->size = sizeof (struct PongMessage);
3555 tx.inbound_bw_limit = n->bw_in;
3556 tx.challenge = t.challenge;
3557 tx.target = t.target;
3558 tp = (struct PongMessage *) &me[1];
3559 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
3560 tp->header.size = htons (sizeof (struct PongMessage));
3561 tp->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3562 derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
3567 sizeof (struct PongMessage) -
3568 ((void *) &tp->challenge - (void *) tp));
3569 GNUNET_STATISTICS_update (stats,
3570 gettext_noop ("# PONG messages created"),
3574 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3575 "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
3577 (unsigned int) t.challenge,
3578 (unsigned int) n->encrypt_key.crc32,
3579 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3582 /* trigger queue processing */
3583 process_encrypted_neighbour_queue (n);
3588 * We received a PONG message. Validate and update our status.
3590 * @param n sender of the PONG
3591 * @param m the encrypted PONG message itself
3592 * @param ats performance data
3593 * @param ats_count number of entries in ats (excluding 0-termination)
3596 handle_pong (struct Neighbour *n,
3597 const struct PongMessage *m,
3598 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3601 struct PongMessage t;
3602 struct ConnectNotifyMessage *cnm;
3603 struct GNUNET_CRYPTO_AesInitializationVector iv;
3604 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
3605 struct GNUNET_TRANSPORT_ATS_Information *mats;
3609 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3610 "Core service receives `%s' response from `%4s'.\n",
3611 "PONG", GNUNET_i2s (&n->peer));
3613 /* mark as garbage, just to be sure */
3614 memset (&t, 255, sizeof (t));
3615 derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
3622 sizeof (struct PongMessage) -
3623 ((void *) &m->challenge - (void *) m)))
3625 GNUNET_break_op (0);
3628 GNUNET_STATISTICS_update (stats,
3629 gettext_noop ("# PONG messages decrypted"),
3633 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3634 "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
3636 GNUNET_i2s (&t.target),
3637 (unsigned int) t.challenge,
3638 (unsigned int) n->decrypt_key.crc32,
3639 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3642 if ((0 != memcmp (&t.target,
3644 sizeof (struct GNUNET_PeerIdentity))) ||
3645 (n->ping_challenge != t.challenge))
3647 /* PONG malformed */
3649 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3650 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
3652 GNUNET_i2s (&n->peer),
3653 (unsigned int) n->ping_challenge);
3654 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3655 "Received malformed `%s' received from `%4s' with challenge %u\n",
3656 "PONG", GNUNET_i2s (&t.target),
3657 (unsigned int) t.challenge);
3659 GNUNET_break_op (n->ping_challenge != t.challenge);
3664 case PEER_STATE_DOWN:
3665 GNUNET_break (0); /* should be impossible */
3667 case PEER_STATE_KEY_SENT:
3668 GNUNET_break (0); /* should be impossible, how did we decrypt? */
3670 case PEER_STATE_KEY_RECEIVED:
3671 GNUNET_STATISTICS_update (stats,
3672 gettext_noop ("# Session keys confirmed via PONG"),
3675 n->status = PEER_STATE_KEY_CONFIRMED;
3676 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
3678 n->bw_out_external_limit = t.inbound_bw_limit;
3679 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3680 n->bw_out_internal_limit);
3681 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3683 GNUNET_TRANSPORT_set_quota (transport,
3687 GNUNET_TIME_UNIT_FOREVER_REL,
3691 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3692 "Confirmed key via `%s' message for peer `%4s'\n",
3693 "PONG", GNUNET_i2s (&n->peer));
3695 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3697 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3698 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3700 update_neighbour_performance (n, ats, ats_count);
3701 size = sizeof (struct ConnectNotifyMessage) +
3702 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3703 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3706 /* recovery strategy: throw away performance data */
3707 GNUNET_array_grow (n->ats,
3710 size = sizeof (struct PeerStatusNotifyMessage) +
3711 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3713 cnm = (struct ConnectNotifyMessage*) buf;
3714 cnm->header.size = htons (size);
3715 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
3716 cnm->ats_count = htonl (n->ats_count);
3717 cnm->peer = n->peer;
3721 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
3722 mats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3723 mats[n->ats_count].value = htonl (0);
3724 send_to_all_clients (&cnm->header,
3726 GNUNET_CORE_OPTION_SEND_CONNECT);
3727 process_encrypted_neighbour_queue (n);
3729 case PEER_STATE_KEY_CONFIRMED:
3730 n->last_activity = GNUNET_TIME_absolute_get ();
3731 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3732 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3734 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3737 handle_peer_status_change (n);
3747 * We received a SET_KEY message. Validate and update
3748 * our key material and status.
3750 * @param n the neighbour from which we received message m
3751 * @param m the set key message we received
3752 * @param ats performance data
3753 * @param ats_count number of entries in ats (excluding 0-termination)
3756 handle_set_key (struct Neighbour *n,
3757 const struct SetKeyMessage *m,
3758 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3761 struct SetKeyMessage *m_cpy;
3762 struct GNUNET_TIME_Absolute t;
3763 struct GNUNET_CRYPTO_AesSessionKey k;
3764 struct PingMessage *ping;
3765 struct PongMessage *pong;
3766 enum PeerStateMachine sender_status;
3769 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3770 "Core service receives `%s' request from `%4s'.\n",
3771 "SET_KEY", GNUNET_i2s (&n->peer));
3773 if (n->public_key == NULL)
3775 if (n->pitr != NULL)
3778 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3779 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3785 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3786 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3788 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3789 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3790 /* lookup n's public key, then try again */
3791 GNUNET_assert (n->skm == NULL);
3793 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3795 GNUNET_TIME_UNIT_MINUTES,
3796 &process_hello_retry_handle_set_key, n);
3797 GNUNET_STATISTICS_update (stats,
3798 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3803 if (0 != memcmp (&m->target,
3805 sizeof (struct GNUNET_PeerIdentity)))
3807 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3808 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3810 GNUNET_i2s (&m->target));
3813 if ((ntohl (m->purpose.size) !=
3814 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3815 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3816 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3817 sizeof (struct GNUNET_PeerIdentity)) ||
3819 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3820 &m->purpose, &m->signature, n->public_key)))
3822 /* invalid signature */
3823 GNUNET_break_op (0);
3826 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3827 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3828 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3829 (t.abs_value < n->decrypt_key_created.abs_value))
3831 /* this could rarely happen due to massive re-ordering of
3832 messages on the network level, but is most likely either
3833 a bug or some adversary messing with us. Report. */
3834 GNUNET_break_op (0);
3838 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3839 "Decrypting key material.\n");
3841 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3844 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3845 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3846 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3848 /* failed to decrypt !? */
3849 GNUNET_break_op (0);
3852 GNUNET_STATISTICS_update (stats,
3853 gettext_noop ("# SET_KEY messages decrypted"),
3857 if (n->decrypt_key_created.abs_value != t.abs_value)
3859 /* fresh key, reset sequence numbers */
3860 n->last_sequence_number_received = 0;
3861 n->last_packets_bitmap = 0;
3862 n->decrypt_key_created = t;
3864 update_neighbour_performance (n, ats, ats_count);
3865 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3868 case PEER_STATE_DOWN:
3869 n->status = PEER_STATE_KEY_RECEIVED;
3871 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3872 "Responding to `%s' with my own key.\n", "SET_KEY");
3876 case PEER_STATE_KEY_SENT:
3877 case PEER_STATE_KEY_RECEIVED:
3878 n->status = PEER_STATE_KEY_RECEIVED;
3879 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3880 (sender_status != PEER_STATE_KEY_CONFIRMED))
3883 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3884 "Responding to `%s' with my own key (other peer has status %u).\n",
3886 (unsigned int) sender_status);
3891 case PEER_STATE_KEY_CONFIRMED:
3892 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3893 (sender_status != PEER_STATE_KEY_CONFIRMED))
3896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3897 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3899 (unsigned int) sender_status);
3908 if (n->pending_ping != NULL)
3910 ping = n->pending_ping;
3911 n->pending_ping = NULL;
3912 handle_ping (n, ping, NULL, 0);
3915 if (n->pending_pong != NULL)
3917 pong = n->pending_pong;
3918 n->pending_pong = NULL;
3919 handle_pong (n, pong, NULL, 0);
3926 * Send a P2P message to a client.
3928 * @param sender who sent us the message?
3929 * @param client who should we give the message to?
3930 * @param m contains the message to transmit
3931 * @param msize number of bytes in buf to transmit
3934 send_p2p_message_to_client (struct Neighbour *sender,
3935 struct Client *client,
3936 const void *m, size_t msize)
3938 size_t size = msize + sizeof (struct NotifyTrafficMessage) +
3939 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3941 struct NotifyTrafficMessage *ntm;
3942 struct GNUNET_TRANSPORT_ATS_Information *ats;
3944 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3947 /* recovery strategy: throw performance data away... */
3948 GNUNET_array_grow (sender->ats,
3951 size = msize + sizeof (struct NotifyTrafficMessage) +
3952 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3955 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3956 "Core service passes message from `%4s' of type %u to client.\n",
3957 GNUNET_i2s(&sender->peer),
3958 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3960 ntm = (struct NotifyTrafficMessage *) buf;
3961 ntm->header.size = htons (size);
3962 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3963 ntm->ats_count = htonl (sender->ats_count);
3964 ntm->peer = sender->peer;
3968 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * sender->ats_count);
3969 ats[sender->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3970 ats[sender->ats_count].value = htonl (0);
3971 memcpy (&ats[sender->ats_count+1],
3974 send_to_client (client, &ntm->header, GNUNET_YES);
3979 * Deliver P2P message to interested clients.
3981 * @param cls always NULL
3982 * @param client who sent us the message (struct Neighbour)
3983 * @param m the message
3986 deliver_message (void *cls,
3988 const struct GNUNET_MessageHeader *m)
3990 struct Neighbour *sender = client;
3991 size_t msize = ntohs (m->size);
3993 struct Client *cpos;
3999 type = ntohs (m->type);
4001 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4002 "Received encapsulated message of type %u and size %u from `%4s'\n",
4003 (unsigned int) type,
4005 GNUNET_i2s (&sender->peer));
4007 GNUNET_snprintf (buf,
4009 gettext_noop ("# bytes of messages of type %u received"),
4010 (unsigned int) type);
4011 GNUNET_STATISTICS_set (stats,
4015 dropped = GNUNET_YES;
4017 while (cpos != NULL)
4019 deliver_full = GNUNET_NO;
4020 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
4021 deliver_full = GNUNET_YES;
4024 for (tpos = 0; tpos < cpos->tcnt; tpos++)
4026 if (type != cpos->types[tpos])
4028 deliver_full = GNUNET_YES;
4032 if (GNUNET_YES == deliver_full)
4034 send_p2p_message_to_client (sender, cpos, m, msize);
4035 dropped = GNUNET_NO;
4037 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
4039 send_p2p_message_to_client (sender, cpos, m,
4040 sizeof (struct GNUNET_MessageHeader));
4044 if (dropped == GNUNET_YES)
4047 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4048 "Message of type %u from `%4s' not delivered to any client.\n",
4049 (unsigned int) type,
4050 GNUNET_i2s (&sender->peer));
4052 GNUNET_STATISTICS_update (stats,
4053 gettext_noop ("# messages not delivered to any client"),
4060 * We received an encrypted message. Decrypt, validate and
4061 * pass on to the appropriate clients.
4063 * @param n target of the message
4064 * @param m encrypted message
4065 * @param ats performance data
4066 * @param ats_count number of entries in ats (excluding 0-termination)
4069 handle_encrypted_message (struct Neighbour *n,
4070 const struct EncryptedMessage *m,
4071 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4074 size_t size = ntohs (m->header.size);
4076 struct EncryptedMessage *pt; /* plaintext */
4079 struct GNUNET_TIME_Absolute t;
4080 struct GNUNET_CRYPTO_AesInitializationVector iv;
4081 struct GNUNET_CRYPTO_AuthKey auth_key;
4084 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4085 "Core service receives `%s' request from `%4s'.\n",
4086 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
4089 derive_auth_key (&auth_key,
4092 n->decrypt_key_created);
4093 GNUNET_CRYPTO_hmac (&auth_key,
4094 &m->sequence_number,
4095 size - ENCRYPTED_HEADER_SIZE, &ph);
4097 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4098 "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
4099 (unsigned int) size - ENCRYPTED_HEADER_SIZE,
4100 GNUNET_CRYPTO_crc32_n (&m->sequence_number,
4101 size - ENCRYPTED_HEADER_SIZE),
4105 if (0 != memcmp (&ph,
4107 sizeof (GNUNET_HashCode)))
4109 /* checksum failed */
4110 GNUNET_break_op (0);
4113 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
4118 &m->sequence_number,
4119 &buf[ENCRYPTED_HEADER_SIZE],
4120 size - ENCRYPTED_HEADER_SIZE))
4122 pt = (struct EncryptedMessage *) buf;
4124 /* validate sequence number */
4125 snum = ntohl (pt->sequence_number);
4126 if (n->last_sequence_number_received == snum)
4128 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4129 "Received duplicate message, ignoring.\n");
4130 /* duplicate, ignore */
4131 GNUNET_STATISTICS_set (stats,
4132 gettext_noop ("# bytes dropped (duplicates)"),
4137 if ((n->last_sequence_number_received > snum) &&
4138 (n->last_sequence_number_received - snum > 32))
4140 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4141 "Received ancient out of sequence message, ignoring.\n");
4142 /* ancient out of sequence, ignore */
4143 GNUNET_STATISTICS_set (stats,
4144 gettext_noop ("# bytes dropped (out of sequence)"),
4149 if (n->last_sequence_number_received > snum)
4151 unsigned int rotbit =
4152 1 << (n->last_sequence_number_received - snum - 1);
4153 if ((n->last_packets_bitmap & rotbit) != 0)
4155 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4156 "Received duplicate message, ignoring.\n");
4157 GNUNET_STATISTICS_set (stats,
4158 gettext_noop ("# bytes dropped (duplicates)"),
4161 /* duplicate, ignore */
4164 n->last_packets_bitmap |= rotbit;
4166 if (n->last_sequence_number_received < snum)
4168 int shift = (snum - n->last_sequence_number_received);
4169 if (shift >= 8 * sizeof(n->last_packets_bitmap))
4170 n->last_packets_bitmap = 0;
4172 n->last_packets_bitmap <<= shift;
4173 n->last_sequence_number_received = snum;
4176 /* check timestamp */
4177 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
4178 if (GNUNET_TIME_absolute_get_duration (t).rel_value > MAX_MESSAGE_AGE.rel_value)
4180 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4182 ("Message received far too old (%llu ms). Content ignored.\n"),
4183 GNUNET_TIME_absolute_get_duration (t).rel_value);
4184 GNUNET_STATISTICS_set (stats,
4185 gettext_noop ("# bytes dropped (ancient message)"),
4191 /* process decrypted message(s) */
4192 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
4194 #if DEBUG_CORE_SET_QUOTA
4195 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4196 "Received %u b/s as new inbound limit for peer `%4s'\n",
4197 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
4198 GNUNET_i2s (&n->peer));
4200 n->bw_out_external_limit = pt->inbound_bw_limit;
4201 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
4202 n->bw_out_internal_limit);
4203 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
4205 GNUNET_TRANSPORT_set_quota (transport,
4209 GNUNET_TIME_UNIT_FOREVER_REL,
4212 n->last_activity = GNUNET_TIME_absolute_get ();
4213 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4214 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4216 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4219 GNUNET_STATISTICS_set (stats,
4220 gettext_noop ("# bytes of payload decrypted"),
4221 size - sizeof (struct EncryptedMessage),
4223 handle_peer_status_change (n);
4224 update_neighbour_performance (n, ats, ats_count);
4225 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
4227 &buf[sizeof (struct EncryptedMessage)],
4228 size - sizeof (struct EncryptedMessage),
4229 GNUNET_YES, GNUNET_NO))
4230 GNUNET_break_op (0);
4235 * Function called by the transport for each received message.
4237 * @param cls closure
4238 * @param peer (claimed) identity of the other peer
4239 * @param message the message
4240 * @param ats performance data
4241 * @param ats_count number of entries in ats (excluding 0-termination)
4244 handle_transport_receive (void *cls,
4245 const struct GNUNET_PeerIdentity *peer,
4246 const struct GNUNET_MessageHeader *message,
4247 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4250 struct Neighbour *n;
4251 struct GNUNET_TIME_Absolute now;
4258 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4259 "Received message of type %u from `%4s', demultiplexing.\n",
4260 (unsigned int) ntohs (message->type),
4263 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4268 n = find_neighbour (peer);
4270 n = create_neighbour (peer);
4271 changed = GNUNET_NO;
4272 up = (n->status == PEER_STATE_KEY_CONFIRMED);
4273 type = ntohs (message->type);
4274 size = ntohs (message->size);
4277 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
4278 if (size != sizeof (struct SetKeyMessage))
4280 GNUNET_break_op (0);
4283 GNUNET_STATISTICS_update (stats,
4284 gettext_noop ("# session keys received"),
4288 (const struct SetKeyMessage *) message,
4291 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
4292 if (size < sizeof (struct EncryptedMessage) +
4293 sizeof (struct GNUNET_MessageHeader))
4295 GNUNET_break_op (0);
4298 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4299 (n->status != PEER_STATE_KEY_CONFIRMED))
4301 GNUNET_STATISTICS_update (stats,
4302 gettext_noop ("# failed to decrypt message (no session key)"),
4308 handle_encrypted_message (n,
4309 (const struct EncryptedMessage *) message,
4312 case GNUNET_MESSAGE_TYPE_CORE_PING:
4313 if (size != sizeof (struct PingMessage))
4315 GNUNET_break_op (0);
4318 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
4319 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4320 (n->status != PEER_STATE_KEY_CONFIRMED))
4323 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4324 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4325 "PING", GNUNET_i2s (&n->peer));
4327 GNUNET_free_non_null (n->pending_ping);
4328 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
4329 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
4332 handle_ping (n, (const struct PingMessage *) message,
4335 case GNUNET_MESSAGE_TYPE_CORE_PONG:
4336 if (size != sizeof (struct PongMessage))
4338 GNUNET_break_op (0);
4341 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
4342 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
4343 (n->status != PEER_STATE_KEY_CONFIRMED) )
4346 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4347 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4348 "PONG", GNUNET_i2s (&n->peer));
4350 GNUNET_free_non_null (n->pending_pong);
4351 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
4352 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
4355 handle_pong (n, (const struct PongMessage *) message,
4359 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4360 _("Unsupported message of type %u received.\n"),
4361 (unsigned int) type);
4364 if (n->status == PEER_STATE_KEY_CONFIRMED)
4366 now = GNUNET_TIME_absolute_get ();
4367 n->last_activity = now;
4368 changed = GNUNET_YES;
4371 GNUNET_STATISTICS_update (stats,
4372 gettext_noop ("# established sessions"),
4375 n->time_established = now;
4377 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4378 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4380 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4385 handle_peer_status_change (n);
4390 * Function that recalculates the bandwidth quota for the
4391 * given neighbour and transmits it to the transport service.
4393 * @param cls neighbour for the quota update
4397 neighbour_quota_update (void *cls,
4398 const struct GNUNET_SCHEDULER_TaskContext *tc)
4400 struct Neighbour *n = cls;
4401 struct GNUNET_BANDWIDTH_Value32NBO q_in;
4402 struct GNUNET_BANDWIDTH_Value32NBO q_out;
4403 struct GNUNET_BANDWIDTH_Value32NBO q_out_min;
4406 unsigned long long distributable;
4407 uint64_t need_per_peer;
4408 uint64_t need_per_second;
4409 unsigned int neighbour_count;
4412 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4413 "Neighbour quota update calculation running for peer `%4s'\n",
4414 GNUNET_i2s (&n->peer));
4416 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
4417 /* calculate relative preference among all neighbours;
4418 divides by a bit more to avoid division by zero AND to
4419 account for possibility of new neighbours joining any time
4420 AND to convert to double... */
4421 neighbour_count = GNUNET_CONTAINER_multihashmap_size (neighbours);
4422 if (neighbour_count == 0)
4424 if (preference_sum == 0)
4426 pref_rel = 1.0 / (double) neighbour_count;
4430 pref_rel = n->current_preference / preference_sum;
4432 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
4433 GNUNET_TIME_UNIT_SECONDS);
4434 need_per_second = need_per_peer * neighbour_count;
4436 /* calculate inbound bandwidth per peer */
4438 if (bandwidth_target_in_bps > need_per_second)
4439 distributable = bandwidth_target_in_bps - need_per_second;
4440 share = distributable * pref_rel;
4441 if (share + need_per_peer > UINT32_MAX)
4442 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4444 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4446 /* calculate outbound bandwidth per peer */
4448 if (bandwidth_target_out_bps > need_per_second)
4449 distributable = bandwidth_target_out_bps - need_per_second;
4450 share = distributable * pref_rel;
4451 if (share + need_per_peer > UINT32_MAX)
4452 q_out = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4454 q_out = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4455 n->bw_out_internal_limit = q_out;
4457 q_out_min = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit, n->bw_out_internal_limit);
4458 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window, n->bw_out);
4460 /* check if we want to disconnect for good due to inactivity */
4461 if ( (GNUNET_TIME_absolute_get_duration (get_neighbour_timeout (n)).rel_value > 0) &&
4462 (GNUNET_TIME_absolute_get_duration (n->time_established).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) )
4465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4466 "Forcing disconnect of `%4s' due to inactivity\n",
4467 GNUNET_i2s (&n->peer));
4469 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
4471 #if DEBUG_CORE_QUOTA
4472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4473 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
4474 GNUNET_i2s (&n->peer),
4475 (unsigned int) ntohl (q_in.value__),
4476 bandwidth_target_out_bps,
4477 (unsigned int) ntohl (n->bw_in.value__),
4478 (unsigned int) ntohl (n->bw_out.value__),
4479 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
4481 if ((n->bw_in.value__ != q_in.value__) || (n->bw_out.value__ != q_out_min.value__))
4483 if (n->bw_in.value__ != q_in.value__)
4485 if (n->bw_out.value__ != q_out_min.value__)
4486 n->bw_out = q_out_min;
4487 if (GNUNET_YES == n->is_connected)
4488 GNUNET_TRANSPORT_set_quota (transport,
4492 GNUNET_TIME_UNIT_FOREVER_REL,
4494 handle_peer_status_change (n);
4496 schedule_quota_update (n);
4501 * Function called by transport to notify us that
4502 * a peer connected to us (on the network level).
4504 * @param cls closure
4505 * @param peer the peer that connected
4506 * @param ats performance data
4507 * @param ats_count number of entries in ats (excluding 0-termination)
4510 handle_transport_notify_connect (void *cls,
4511 const struct GNUNET_PeerIdentity *peer,
4512 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4515 struct Neighbour *n;
4517 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4522 n = find_neighbour (peer);
4525 if (GNUNET_YES == n->is_connected)
4527 /* duplicate connect notification!? */
4534 n = create_neighbour (peer);
4536 GNUNET_STATISTICS_update (stats,
4537 gettext_noop ("# peers connected (transport)"),
4540 n->is_connected = GNUNET_YES;
4541 update_neighbour_performance (n, ats, ats_count);
4542 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
4545 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
4549 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4550 "Received connection from `%4s'.\n",
4551 GNUNET_i2s (&n->peer));
4553 GNUNET_TRANSPORT_set_quota (transport,
4557 GNUNET_TIME_UNIT_FOREVER_REL,
4564 * Function called by transport telling us that a peer
4567 * @param cls closure
4568 * @param peer the peer that disconnected
4571 handle_transport_notify_disconnect (void *cls,
4572 const struct GNUNET_PeerIdentity *peer)
4574 struct DisconnectNotifyMessage cnm;
4575 struct Neighbour *n;
4576 struct ClientActiveRequest *car;
4577 struct GNUNET_TIME_Relative left;
4580 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4581 "Peer `%4s' disconnected from us; received notification from transport.\n",
4584 n = find_neighbour (peer);
4590 GNUNET_break (n->is_connected == GNUNET_YES);
4591 if (n->status == PEER_STATE_KEY_CONFIRMED)
4593 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
4594 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
4595 cnm.reserved = htonl (0);
4597 send_to_all_clients (&cnm.header, GNUNET_NO, GNUNET_CORE_OPTION_SEND_DISCONNECT);
4598 GNUNET_STATISTICS_update (stats,
4599 gettext_noop ("# established sessions"),
4604 /* On transport disconnect transport doesn't cancel requests, so must do so here. */
4607 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
4610 n->is_connected = GNUNET_NO;
4611 n->status = PEER_STATE_DOWN;
4612 while (NULL != (car = n->active_client_request_head))
4614 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
4615 n->active_client_request_tail,
4617 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
4618 &n->peer.hashPubKey,
4623 GNUNET_STATISTICS_update (stats,
4624 gettext_noop ("# peers connected (transport)"),
4627 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
4628 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
4629 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4630 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
4631 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
4633 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
4634 &consider_free_task,
4640 * Wrapper around 'free_neighbour'; helper for 'cleaning_task'.
4643 free_neighbour_helper (void *cls,
4644 const GNUNET_HashCode *key,
4647 struct Neighbour *n = value;
4655 * Last task run during shutdown. Disconnects us from
4659 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4665 "Core service shutting down.\n");
4667 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
4668 &free_neighbour_helper,
4670 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
4672 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), 0, GNUNET_NO);
4673 GNUNET_assert (transport != NULL);
4674 GNUNET_TRANSPORT_disconnect (transport);
4676 GNUNET_SERVER_notification_context_destroy (notifier);
4678 while (NULL != (c = clients))
4679 handle_client_disconnect (NULL, c->client_handle);
4680 if (my_private_key != NULL)
4681 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4683 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4684 if (peerinfo != NULL)
4685 GNUNET_PEERINFO_disconnect (peerinfo);
4687 GNUNET_SERVER_mst_destroy (mst);
4692 * Initiate core service.
4694 * @param cls closure
4695 * @param server the initialized server
4696 * @param c configuration to use
4700 struct GNUNET_SERVER_Handle *server,
4701 const struct GNUNET_CONFIGURATION_Handle *c)
4703 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4704 {&handle_client_init, NULL,
4705 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
4706 {&handle_client_iterate_peers, NULL,
4707 GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS,
4708 sizeof (struct GNUNET_MessageHeader)},
4709 {&handle_client_have_peer, NULL,
4710 GNUNET_MESSAGE_TYPE_CORE_PEER_CONNECTED,
4711 sizeof (struct GNUNET_MessageHeader) + sizeof(struct GNUNET_PeerIdentity)},
4712 {&handle_client_request_info, NULL,
4713 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
4714 sizeof (struct RequestInfoMessage)},
4715 {&handle_client_send_request, NULL,
4716 GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST,
4717 sizeof (struct SendMessageRequest)},
4718 {&handle_client_send, NULL,
4719 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
4720 {&handle_client_request_connect, NULL,
4721 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
4722 sizeof (struct ConnectMessage)},
4728 /* parse configuration */
4731 GNUNET_CONFIGURATION_get_value_number (c,
4734 &bandwidth_target_in_bps)) ||
4736 GNUNET_CONFIGURATION_get_value_number (c,
4739 &bandwidth_target_out_bps)) ||
4741 GNUNET_CONFIGURATION_get_value_filename (c,
4743 "HOSTKEY", &keyfile)))
4745 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4747 ("Core service is lacking key configuration settings. Exiting.\n"));
4748 GNUNET_SCHEDULER_shutdown ();
4751 peerinfo = GNUNET_PEERINFO_connect (cfg);
4752 if (NULL == peerinfo)
4754 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4755 _("Could not access PEERINFO service. Exiting.\n"));
4756 GNUNET_SCHEDULER_shutdown ();
4757 GNUNET_free (keyfile);
4760 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4761 GNUNET_free (keyfile);
4762 if (my_private_key == NULL)
4764 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4765 _("Core service could not access hostkey. Exiting.\n"));
4766 GNUNET_PEERINFO_disconnect (peerinfo);
4767 GNUNET_SCHEDULER_shutdown ();
4770 neighbours = GNUNET_CONTAINER_multihashmap_create (128);
4771 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4772 GNUNET_CRYPTO_hash (&my_public_key,
4773 sizeof (my_public_key), &my_identity.hashPubKey);
4774 self.public_key = &my_public_key;
4775 self.peer = my_identity;
4776 self.last_activity = GNUNET_TIME_UNIT_FOREVER_ABS;
4777 self.status = PEER_STATE_KEY_CONFIRMED;
4778 self.is_connected = GNUNET_YES;
4779 /* setup notification */
4780 notifier = GNUNET_SERVER_notification_context_create (server,
4782 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
4783 /* setup transport connection */
4784 transport = GNUNET_TRANSPORT_connect (cfg,
4787 &handle_transport_receive,
4788 &handle_transport_notify_connect,
4789 &handle_transport_notify_disconnect);
4790 GNUNET_assert (NULL != transport);
4791 stats = GNUNET_STATISTICS_create ("core", cfg);
4793 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded CORE_SEND requests"), 0, GNUNET_NO);
4794 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 0, GNUNET_NO);
4796 mst = GNUNET_SERVER_mst_create (&deliver_message,
4798 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
4799 &cleaning_task, NULL);
4800 /* process client requests */
4801 GNUNET_SERVER_add_handlers (server, handlers);
4802 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4803 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
4809 * The main function for the transport service.
4811 * @param argc number of arguments from the command line
4812 * @param argv command line arguments
4813 * @return 0 ok, 1 on error
4816 main (int argc, char *const *argv)
4818 return (GNUNET_OK ==
4819 GNUNET_SERVICE_run (argc,
4822 GNUNET_SERVICE_OPTION_NONE,
4823 &run, NULL)) ? 0 : 1;
4826 /* end of gnunet-service-core.c */