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 #if DEBUG_CORE_CLIENT
1577 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1578 "Core service receives `%s' request.\n", "REQUEST_INFO");
1583 if (client == pos->client_handle)
1590 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1594 rcm = (const struct RequestInfoMessage *) message;
1595 n = find_neighbour (&rcm->peer);
1596 memset (&cim, 0, sizeof (cim));
1599 want_reserv = ntohl (rcm->reserve_inbound);
1600 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1602 n->bw_out_internal_limit = rcm->limit_outbound;
1603 if (n->bw_out.value__ != GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1604 n->bw_out_external_limit).value__)
1606 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1607 n->bw_out_external_limit);
1608 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1610 GNUNET_TRANSPORT_set_quota (transport,
1614 GNUNET_TIME_UNIT_FOREVER_REL,
1616 handle_peer_status_change (n);
1619 if (want_reserv < 0)
1621 got_reserv = want_reserv;
1623 else if (want_reserv > 0)
1625 rdelay = GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1627 if (rdelay.rel_value == 0)
1628 got_reserv = want_reserv;
1630 got_reserv = 0; /* all or nothing */
1634 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1636 old_preference = n->current_preference;
1637 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1638 if (old_preference > n->current_preference)
1640 /* overflow; cap at maximum value */
1641 n->current_preference = ULLONG_MAX;
1643 update_preference_sum (n->current_preference - old_preference);
1644 #if DEBUG_CORE_QUOTA
1645 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1646 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1648 GNUNET_i2s (&rcm->peer),
1651 cim.reserved_amount = htonl (got_reserv);
1652 cim.reserve_delay = GNUNET_TIME_relative_hton (rdelay);
1653 cim.rim_id = rcm->rim_id;
1654 cim.bw_out = n->bw_out;
1655 cim.preference = n->current_preference;
1657 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1658 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1659 cim.peer = rcm->peer;
1660 #if DEBUG_CORE_CLIENT
1661 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1662 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1664 send_to_client (pos, &cim.header, GNUNET_NO);
1665 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1670 * Free the given entry for the neighbour (it has
1671 * already been removed from the list at this point).
1673 * @param n neighbour to free
1676 free_neighbour (struct Neighbour *n)
1678 struct MessageEntry *m;
1679 struct ClientActiveRequest *car;
1682 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1683 "Destroying neighbour entry for peer `%4s'\n",
1684 GNUNET_i2s (&n->peer));
1686 if (n->pitr != NULL)
1688 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1693 GNUNET_free (n->skm);
1696 while (NULL != (m = n->messages))
1698 n->messages = m->next;
1701 while (NULL != (m = n->encrypted_head))
1703 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1708 while (NULL != (car = n->active_client_request_head))
1710 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1711 n->active_client_request_tail,
1713 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
1714 &n->peer.hashPubKey,
1720 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1723 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1724 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
1725 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1726 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
1727 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1728 GNUNET_SCHEDULER_cancel (n->quota_update_task);
1729 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1730 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1731 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1732 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
1733 if (n->status == PEER_STATE_KEY_CONFIRMED)
1734 GNUNET_STATISTICS_update (stats,
1735 gettext_noop ("# established sessions"),
1738 GNUNET_array_grow (n->ats, n->ats_count, 0);
1739 GNUNET_free_non_null (n->public_key);
1740 GNUNET_free_non_null (n->pending_ping);
1741 GNUNET_free_non_null (n->pending_pong);
1747 * Check if we have encrypted messages for the specified neighbour
1748 * pending, and if so, check with the transport about sending them
1751 * @param n neighbour to check.
1753 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1757 * Encrypt size bytes from in and write the result to out. Use the
1758 * key for outbound traffic of the given neighbour.
1760 * @param n neighbour we are sending to
1761 * @param iv initialization vector to use
1762 * @param in ciphertext
1763 * @param out plaintext
1764 * @param size size of in/out
1765 * @return GNUNET_OK on success
1768 do_encrypt (struct Neighbour *n,
1769 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1770 const void *in, void *out, size_t size)
1772 if (size != (uint16_t) size)
1777 GNUNET_assert (size ==
1778 GNUNET_CRYPTO_aes_encrypt (in,
1782 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1784 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1785 "Encrypted %u bytes for `%4s' using key %u, IV %u\n",
1786 (unsigned int) size,
1787 GNUNET_i2s (&n->peer),
1788 (unsigned int) n->encrypt_key.crc32,
1789 GNUNET_CRYPTO_crc32_n (iv, sizeof(iv)));
1796 * Consider freeing the given neighbour since we may not need
1797 * to keep it around anymore.
1799 * @param n neighbour to consider discarding
1802 consider_free_neighbour (struct Neighbour *n);
1806 * Task triggered when a neighbour entry is about to time out
1807 * (and we should prevent this by sending a PING).
1809 * @param cls the 'struct Neighbour'
1810 * @param tc scheduler context (not used)
1813 send_keep_alive (void *cls,
1814 const struct GNUNET_SCHEDULER_TaskContext *tc)
1816 struct Neighbour *n = cls;
1817 struct GNUNET_TIME_Relative retry;
1818 struct GNUNET_TIME_Relative left;
1819 struct MessageEntry *me;
1820 struct PingMessage pp;
1821 struct PingMessage *pm;
1822 struct GNUNET_CRYPTO_AesInitializationVector iv;
1824 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1826 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1827 sizeof (struct PingMessage));
1828 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1829 me->priority = PING_PRIORITY;
1830 me->size = sizeof (struct PingMessage);
1831 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1835 pm = (struct PingMessage *) &me[1];
1836 pm->header.size = htons (sizeof (struct PingMessage));
1837 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1838 pm->iv_seed = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1840 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
1841 pp.challenge = n->ping_challenge;
1842 pp.target = n->peer;
1844 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1845 "Encrypting `%s' message with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
1847 (unsigned int) n->ping_challenge,
1848 GNUNET_i2s (&n->peer),
1849 (unsigned int) n->encrypt_key.crc32,
1850 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
1857 sizeof (struct PingMessage) -
1858 ((void *) &pm->target - (void *) pm));
1859 process_encrypted_neighbour_queue (n);
1860 /* reschedule PING job */
1861 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1862 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1863 MIN_PING_FREQUENCY);
1865 = GNUNET_SCHEDULER_add_delayed (retry,
1873 * Task triggered when a neighbour entry might have gotten stale.
1875 * @param cls the 'struct Neighbour'
1876 * @param tc scheduler context (not used)
1879 consider_free_task (void *cls,
1880 const struct GNUNET_SCHEDULER_TaskContext *tc)
1882 struct Neighbour *n = cls;
1884 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1885 consider_free_neighbour (n);
1890 * Consider freeing the given neighbour since we may not need
1891 * to keep it around anymore.
1893 * @param n neighbour to consider discarding
1896 consider_free_neighbour (struct Neighbour *n)
1898 struct GNUNET_TIME_Relative left;
1900 if ( (n->th != NULL) ||
1901 (n->pitr != NULL) ||
1902 (GNUNET_YES == n->is_connected) )
1903 return; /* no chance */
1905 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1906 if (left.rel_value > 0)
1908 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1909 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1910 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (left,
1911 &consider_free_task,
1915 /* actually free the neighbour... */
1916 GNUNET_assert (GNUNET_OK ==
1917 GNUNET_CONTAINER_multihashmap_remove (neighbours,
1918 &n->peer.hashPubKey,
1920 GNUNET_STATISTICS_set (stats,
1921 gettext_noop ("# neighbour entries allocated"),
1922 GNUNET_CONTAINER_multihashmap_size (neighbours),
1929 * Function called when the transport service is ready to
1930 * receive an encrypted message for the respective peer
1932 * @param cls neighbour to use message from
1933 * @param size number of bytes we can transmit
1934 * @param buf where to copy the message
1935 * @return number of bytes transmitted
1938 notify_encrypted_transmit_ready (void *cls,
1942 struct Neighbour *n = cls;
1943 struct MessageEntry *m;
1948 m = n->encrypted_head;
1952 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1953 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1954 GNUNET_i2s (&n->peer));
1958 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1965 GNUNET_assert (size >= m->size);
1966 memcpy (cbuf, &m[1], m->size);
1968 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1971 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1972 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1973 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1975 GNUNET_i2s (&n->peer));
1977 process_encrypted_neighbour_queue (n);
1982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1983 "Transmission of message of type %u and size %u failed\n",
1984 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1985 (unsigned int) m->size);
1989 consider_free_neighbour (n);
1990 GNUNET_STATISTICS_update (stats,
1991 gettext_noop ("# encrypted bytes given to transport"),
1999 * Check if we have plaintext messages for the specified neighbour
2000 * pending, and if so, consider batching and encrypting them (and
2001 * then trigger processing of the encrypted queue if needed).
2003 * @param n neighbour to check.
2005 static void process_plaintext_neighbour_queue (struct Neighbour *n);
2009 * Check if we have encrypted messages for the specified neighbour
2010 * pending, and if so, check with the transport about sending them
2013 * @param n neighbour to check.
2016 process_encrypted_neighbour_queue (struct Neighbour *n)
2018 struct MessageEntry *m;
2021 return; /* request already pending */
2022 m = n->encrypted_head;
2025 /* encrypted queue empty, try plaintext instead */
2026 process_plaintext_neighbour_queue (n);
2030 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2031 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
2032 (unsigned int) m->size,
2033 GNUNET_i2s (&n->peer),
2034 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
2037 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
2040 GNUNET_TIME_absolute_get_remaining
2042 ¬ify_encrypted_transmit_ready,
2046 /* message request too large or duplicate request */
2048 /* discard encrypted message */
2049 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
2053 process_encrypted_neighbour_queue (n);
2059 * Decrypt size bytes from in and write the result to out. Use the
2060 * key for inbound traffic of the given neighbour. This function does
2061 * NOT do any integrity-checks on the result.
2063 * @param n neighbour we are receiving from
2064 * @param iv initialization vector to use
2065 * @param in ciphertext
2066 * @param out plaintext
2067 * @param size size of in/out
2068 * @return GNUNET_OK on success
2071 do_decrypt (struct Neighbour *n,
2072 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
2073 const void *in, void *out, size_t size)
2075 if (size != (uint16_t) size)
2080 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
2081 (n->status != PEER_STATE_KEY_CONFIRMED))
2083 GNUNET_break_op (0);
2084 return GNUNET_SYSERR;
2087 GNUNET_CRYPTO_aes_decrypt (in,
2094 return GNUNET_SYSERR;
2096 GNUNET_STATISTICS_update (stats,
2097 gettext_noop ("# bytes decrypted"),
2101 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2102 "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
2103 (unsigned int) size,
2104 GNUNET_i2s (&n->peer),
2105 (unsigned int) n->decrypt_key.crc32,
2106 GNUNET_CRYPTO_crc32_n (iv, sizeof(*iv)));
2113 * Select messages for transmission. This heuristic uses a combination
2114 * of earliest deadline first (EDF) scheduling (with bounded horizon)
2115 * and priority-based discard (in case no feasible schedule exist) and
2116 * speculative optimization (defer any kind of transmission until
2117 * we either create a batch of significant size, 25% of max, or until
2118 * we are close to a deadline). Furthermore, when scheduling the
2119 * heuristic also packs as many messages into the batch as possible,
2120 * starting with those with the earliest deadline. Yes, this is fun.
2122 * @param n neighbour to select messages from
2123 * @param size number of bytes to select for transmission
2124 * @param retry_time set to the time when we should try again
2125 * (only valid if this function returns zero)
2126 * @return number of bytes selected, or 0 if we decided to
2127 * defer scheduling overall; in that case, retry_time is set.
2130 select_messages (struct Neighbour *n,
2131 size_t size, struct GNUNET_TIME_Relative *retry_time)
2133 struct MessageEntry *pos;
2134 struct MessageEntry *min;
2135 struct MessageEntry *last;
2136 unsigned int min_prio;
2137 struct GNUNET_TIME_Absolute t;
2138 struct GNUNET_TIME_Absolute now;
2139 struct GNUNET_TIME_Relative delta;
2141 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
2144 unsigned int queue_size;
2145 int discard_low_prio;
2147 GNUNET_assert (NULL != n->messages);
2148 now = GNUNET_TIME_absolute_get ();
2149 /* last entry in linked list of messages processed */
2151 /* should we remove the entry with the lowest
2152 priority from consideration for scheduling at the
2163 discard_low_prio = GNUNET_YES;
2164 while (GNUNET_YES == discard_low_prio)
2167 min_prio = UINT_MAX;
2168 discard_low_prio = GNUNET_NO;
2169 /* calculate number of bytes available for transmission at time "t" */
2170 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
2172 /* how many bytes have we (hypothetically) scheduled so far */
2174 /* maximum time we can wait before transmitting anything
2175 and still make all of our deadlines */
2176 slack = GNUNET_TIME_UNIT_FOREVER_REL;
2178 /* note that we use "*2" here because we want to look
2179 a bit further into the future; much more makes no
2180 sense since new message might be scheduled in the
2182 while ((pos != NULL) && (off < size * 2))
2184 if (pos->do_transmit == GNUNET_YES)
2186 /* already removed from consideration */
2190 if (discard_low_prio == GNUNET_NO)
2192 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
2193 if (delta.rel_value > 0)
2195 // FIXME: HUH? Check!
2197 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
2200 if (avail < pos->size)
2202 // FIXME: HUH? Check!
2203 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
2208 /* update slack, considering both its absolute deadline
2209 and relative deadlines caused by other messages
2210 with their respective load */
2211 slack = GNUNET_TIME_relative_min (slack,
2212 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
2214 if (pos->deadline.abs_value <= now.abs_value)
2217 slack = GNUNET_TIME_UNIT_ZERO;
2219 else if (GNUNET_YES == pos->got_slack)
2221 /* should be soon now! */
2222 slack = GNUNET_TIME_relative_min (slack,
2223 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
2228 GNUNET_TIME_relative_min (slack,
2229 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
2230 pos->got_slack = GNUNET_YES;
2231 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
2232 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
2237 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
2238 if (pos->priority <= min_prio)
2240 /* update min for discard */
2241 min_prio = pos->priority;
2246 if (discard_low_prio)
2248 GNUNET_assert (min != NULL);
2249 /* remove lowest-priority entry from consideration */
2250 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
2254 /* guard against sending "tiny" messages with large headers without
2256 if ( (slack.rel_value > GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value) &&
2258 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
2260 /* less than 25% of message would be filled with deadlines still
2261 being met if we delay by one second or more; so just wait for
2262 more data; but do not wait longer than 1s (since we don't want
2263 to delay messages for a really long time either). */
2264 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
2265 /* reset do_transmit values for next time */
2268 pos->do_transmit = GNUNET_NO;
2271 GNUNET_STATISTICS_update (stats,
2272 gettext_noop ("# transmissions delayed due to corking"),
2275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2276 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
2277 (unsigned long long) retry_time->rel_value,
2279 (unsigned int) size);
2283 /* select marked messages (up to size) for transmission */
2288 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
2290 pos->do_transmit = GNUNET_YES; /* mark for transmission */
2294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2295 "Selecting message of size %u for transmission\n",
2296 (unsigned int) pos->size);
2302 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2303 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
2304 (unsigned int) pos->size,
2307 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
2312 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2313 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
2314 (unsigned long long) off, (unsigned long long) tsize,
2315 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
2316 GNUNET_i2s (&n->peer));
2323 * Batch multiple messages into a larger buffer.
2325 * @param n neighbour to take messages from
2326 * @param buf target buffer
2327 * @param size size of buf
2328 * @param deadline set to transmission deadline for the result
2329 * @param retry_time set to the time when we should try again
2330 * (only valid if this function returns zero)
2331 * @param priority set to the priority of the batch
2332 * @return number of bytes written to buf (can be zero)
2335 batch_message (struct Neighbour *n,
2338 struct GNUNET_TIME_Absolute *deadline,
2339 struct GNUNET_TIME_Relative *retry_time,
2340 unsigned int *priority)
2342 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
2343 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
2344 struct MessageEntry *pos;
2345 struct MessageEntry *prev;
2346 struct MessageEntry *next;
2351 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2352 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
2353 if (0 == select_messages (n, size, retry_time))
2356 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2357 "No messages selected, will try again in %llu ms\n",
2358 retry_time->rel_value);
2362 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
2363 ntm->ats_count = htonl (0);
2364 ntm->ats.type = htonl (0);
2365 ntm->ats.value = htonl (0);
2366 ntm->peer = n->peer;
2369 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
2372 if (GNUNET_YES == pos->do_transmit)
2374 GNUNET_assert (pos->size <= size);
2375 /* do notifications */
2376 /* FIXME: track if we have *any* client that wants
2377 full notifications and only do this if that is
2379 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
2381 memcpy (&ntm[1], &pos[1], pos->size);
2382 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2383 sizeof (struct GNUNET_MessageHeader));
2384 send_to_all_clients (&ntm->header,
2386 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
2390 /* message too large for 'full' notifications, we do at
2391 least the 'hdr' type */
2394 sizeof (struct GNUNET_MessageHeader));
2396 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2398 send_to_all_clients (&ntm->header,
2400 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
2402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2403 "Encrypting %u bytes with message of type %u and size %u\n",
2405 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
2406 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
2408 /* copy for encrypted transmission */
2409 memcpy (&buf[ret], &pos[1], pos->size);
2412 *priority += pos->priority;
2414 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2415 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
2416 (unsigned int) pos->size,
2417 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).rel_value);
2419 deadline->abs_value = GNUNET_MIN (deadline->abs_value, pos->deadline.abs_value);
2433 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2434 "Deadline for message batch is %llu ms\n",
2435 GNUNET_TIME_absolute_get_remaining (*deadline).rel_value);
2442 * Remove messages with deadlines that have long expired from
2445 * @param n neighbour to inspect
2448 discard_expired_messages (struct Neighbour *n)
2450 struct MessageEntry *prev;
2451 struct MessageEntry *next;
2452 struct MessageEntry *pos;
2453 struct GNUNET_TIME_Absolute now;
2454 struct GNUNET_TIME_Relative delta;
2458 now = GNUNET_TIME_absolute_get ();
2464 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
2465 if (delta.rel_value > PAST_EXPIRATION_DISCARD_TIME.rel_value)
2468 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2469 "Message is %llu ms past due, discarding.\n",
2476 GNUNET_STATISTICS_update (stats,
2477 gettext_noop ("# messages discarded (expired prior to transmission)"),
2487 if (GNUNET_YES == disc)
2488 schedule_peer_messages (n);
2493 * Signature of the main function of a task.
2495 * @param cls closure
2496 * @param tc context information (why was this task triggered now)
2499 retry_plaintext_processing (void *cls,
2500 const struct GNUNET_SCHEDULER_TaskContext *tc)
2502 struct Neighbour *n = cls;
2504 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2505 process_plaintext_neighbour_queue (n);
2510 * Send our key (and encrypted PING) to the other peer.
2512 * @param n the other peer
2514 static void send_key (struct Neighbour *n);
2517 * Task that will retry "send_key" if our previous attempt failed
2521 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2523 struct Neighbour *n = cls;
2526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2527 "Retrying key transmission to `%4s'\n",
2528 GNUNET_i2s (&n->peer));
2530 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2531 n->set_key_retry_frequency =
2532 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
2538 * Check if we have plaintext messages for the specified neighbour
2539 * pending, and if so, consider batching and encrypting them (and
2540 * then trigger processing of the encrypted queue if needed).
2542 * @param n neighbour to check.
2545 process_plaintext_neighbour_queue (struct Neighbour *n)
2547 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
2549 struct EncryptedMessage *em; /* encrypted message */
2550 struct EncryptedMessage *ph; /* plaintext header */
2551 struct MessageEntry *me;
2552 unsigned int priority;
2553 struct GNUNET_TIME_Absolute deadline;
2554 struct GNUNET_TIME_Relative retry_time;
2555 struct GNUNET_CRYPTO_AesInitializationVector iv;
2556 struct GNUNET_CRYPTO_AuthKey auth_key;
2558 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
2560 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
2561 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2565 case PEER_STATE_DOWN:
2568 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2569 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2570 GNUNET_i2s(&n->peer));
2573 case PEER_STATE_KEY_SENT:
2574 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2575 n->retry_set_key_task
2576 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2577 &set_key_retry_task, n);
2579 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2580 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2581 GNUNET_i2s(&n->peer));
2584 case PEER_STATE_KEY_RECEIVED:
2585 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2586 n->retry_set_key_task
2587 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2588 &set_key_retry_task, n);
2590 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2591 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2592 GNUNET_i2s(&n->peer));
2595 case PEER_STATE_KEY_CONFIRMED:
2596 /* ready to continue */
2599 discard_expired_messages (n);
2600 if (n->messages == NULL)
2603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2604 "Plaintext message queue for `%4s' is empty.\n",
2605 GNUNET_i2s(&n->peer));
2607 return; /* no pending messages */
2609 if (n->encrypted_head != NULL)
2612 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2613 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2614 GNUNET_i2s(&n->peer));
2616 return; /* wait for messages already encrypted to be
2619 ph = (struct EncryptedMessage *) pbuf;
2620 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2622 used = sizeof (struct EncryptedMessage);
2623 used += batch_message (n,
2625 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2626 &deadline, &retry_time, &priority);
2627 if (used == sizeof (struct EncryptedMessage))
2630 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2631 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2632 GNUNET_i2s(&n->peer));
2634 /* no messages selected for sending, try again later... */
2635 n->retry_plaintext_task =
2636 GNUNET_SCHEDULER_add_delayed (retry_time,
2637 &retry_plaintext_processing, n);
2640 #if DEBUG_CORE_QUOTA
2641 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2642 "Sending %u b/s as new limit to peer `%4s'\n",
2643 (unsigned int) ntohl (n->bw_in.value__),
2644 GNUNET_i2s (&n->peer));
2646 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
2647 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2648 ph->inbound_bw_limit = n->bw_in;
2649 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2651 /* setup encryption message header */
2652 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2653 me->deadline = deadline;
2654 me->priority = priority;
2656 em = (struct EncryptedMessage *) &me[1];
2657 em->header.size = htons (used);
2658 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2659 em->iv_seed = ph->iv_seed;
2660 derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
2663 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2664 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2665 (unsigned int) used - ENCRYPTED_HEADER_SIZE,
2666 GNUNET_i2s(&n->peer),
2667 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).rel_value);
2669 GNUNET_assert (GNUNET_OK ==
2672 &ph->sequence_number,
2673 &em->sequence_number, used - ENCRYPTED_HEADER_SIZE));
2674 derive_auth_key (&auth_key,
2677 n->encrypt_key_created);
2678 GNUNET_CRYPTO_hmac (&auth_key,
2679 &em->sequence_number,
2680 used - ENCRYPTED_HEADER_SIZE,
2683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2684 "Authenticated %u bytes of ciphertext %u: `%s'\n",
2685 used - ENCRYPTED_HEADER_SIZE,
2686 GNUNET_CRYPTO_crc32_n (&em->sequence_number,
2687 used - ENCRYPTED_HEADER_SIZE),
2688 GNUNET_h2s (&em->hmac));
2690 /* append to transmission list */
2691 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2695 process_encrypted_neighbour_queue (n);
2696 schedule_peer_messages (n);
2701 * Function that recalculates the bandwidth quota for the
2702 * given neighbour and transmits it to the transport service.
2704 * @param cls neighbour for the quota update
2708 neighbour_quota_update (void *cls,
2709 const struct GNUNET_SCHEDULER_TaskContext *tc);
2713 * Schedule the task that will recalculate the bandwidth
2714 * quota for this peer (and possibly force a disconnect of
2715 * idle peers by calculating a bandwidth of zero).
2718 schedule_quota_update (struct Neighbour *n)
2720 GNUNET_assert (n->quota_update_task ==
2721 GNUNET_SCHEDULER_NO_TASK);
2722 n->quota_update_task
2723 = GNUNET_SCHEDULER_add_delayed (QUOTA_UPDATE_FREQUENCY,
2724 &neighbour_quota_update,
2730 * Initialize a new 'struct Neighbour'.
2732 * @param pid ID of the new neighbour
2733 * @return handle for the new neighbour
2735 static struct Neighbour *
2736 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2738 struct Neighbour *n;
2739 struct GNUNET_TIME_Absolute now;
2742 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2743 "Creating neighbour entry for peer `%4s'\n",
2746 n = GNUNET_malloc (sizeof (struct Neighbour));
2748 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2749 now = GNUNET_TIME_absolute_get ();
2750 n->encrypt_key_created = now;
2751 n->last_activity = now;
2752 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2753 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2754 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2755 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2756 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2757 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
2759 GNUNET_assert (GNUNET_OK ==
2760 GNUNET_CONTAINER_multihashmap_put (neighbours,
2761 &n->peer.hashPubKey,
2763 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2764 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
2765 GNUNET_CONTAINER_multihashmap_size (neighbours), GNUNET_NO);
2766 neighbour_quota_update (n, NULL);
2767 consider_free_neighbour (n);
2773 * Handle CORE_SEND request.
2776 * @param client the client issuing the request
2777 * @param message the "struct SendMessage"
2780 handle_client_send (void *cls,
2781 struct GNUNET_SERVER_Client *client,
2782 const struct GNUNET_MessageHeader *message)
2784 const struct SendMessage *sm;
2785 struct Neighbour *n;
2786 struct MessageEntry *prev;
2787 struct MessageEntry *pos;
2788 struct MessageEntry *e;
2789 struct MessageEntry *min_prio_entry;
2790 struct MessageEntry *min_prio_prev;
2791 unsigned int min_prio;
2792 unsigned int queue_size;
2795 msize = ntohs (message->size);
2797 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2799 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));
2802 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2805 sm = (const struct SendMessage *) message;
2806 msize -= sizeof (struct SendMessage);
2807 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2810 GNUNET_SERVER_mst_receive (mst,
2812 (const char*) &sm[1],
2817 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2820 n = find_neighbour (&sm->peer);
2822 n = create_neighbour (&sm->peer);
2824 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2825 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2827 (unsigned int) msize,
2828 GNUNET_i2s (&sm->peer));
2830 discard_expired_messages (n);
2831 /* bound queue size */
2832 /* NOTE: this entire block to bound the queue size should be
2833 obsolete with the new client-request code and the
2834 'schedule_peer_messages' mechanism; we still have this code in
2835 here for now as a sanity check for the new mechanmism;
2836 ultimately, we should probably simply reject SEND messages that
2837 are not 'approved' (or provide a new core API for very unreliable
2838 delivery that always sends with priority 0). Food for thought. */
2839 min_prio = UINT32_MAX;
2840 min_prio_entry = NULL;
2841 min_prio_prev = NULL;
2847 if (pos->priority <= min_prio)
2849 min_prio_entry = pos;
2850 min_prio_prev = prev;
2851 min_prio = pos->priority;
2857 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2860 if (ntohl(sm->priority) <= min_prio)
2862 /* discard new entry; this should no longer happen! */
2865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2866 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2868 (unsigned int) MAX_PEER_QUEUE_SIZE,
2869 (unsigned int) msize,
2870 (unsigned int) ntohs (message->type));
2872 GNUNET_STATISTICS_update (stats,
2873 gettext_noop ("# discarded CORE_SEND requests"),
2877 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2880 GNUNET_assert (min_prio_entry != NULL);
2881 /* discard "min_prio_entry" */
2883 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2884 "Queue full, discarding existing older request\n");
2886 GNUNET_STATISTICS_update (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 1, GNUNET_NO);
2887 if (min_prio_prev == NULL)
2888 n->messages = min_prio_entry->next;
2890 min_prio_prev->next = min_prio_entry->next;
2891 GNUNET_free (min_prio_entry);
2895 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2896 "Adding transmission request for `%4s' of size %u to queue\n",
2897 GNUNET_i2s (&sm->peer),
2898 (unsigned int) msize);
2900 GNUNET_break (0 == ntohl (sm->reserved));
2901 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2902 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2903 e->priority = ntohl (sm->priority);
2905 if (GNUNET_YES != (int) ntohl (sm->cork))
2906 e->got_slack = GNUNET_YES;
2907 memcpy (&e[1], &sm[1], msize);
2909 /* insert, keep list sorted by deadline */
2912 while ((pos != NULL) && (pos->deadline.abs_value < e->deadline.abs_value))
2923 /* consider scheduling now */
2924 process_plaintext_neighbour_queue (n);
2926 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2931 * Function called when the transport service is ready to
2932 * receive a message. Only resets 'n->th' to NULL.
2934 * @param cls neighbour to use message from
2935 * @param size number of bytes we can transmit
2936 * @param buf where to copy the message
2937 * @return number of bytes transmitted
2940 notify_transport_connect_done (void *cls,
2944 struct Neighbour *n = cls;
2947 if (GNUNET_YES != n->is_connected)
2949 /* transport should only call us to transmit a message after
2950 * telling us about a successful connection to the respective peer */
2952 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2953 "Timeout on notify connect!\n");
2955 GNUNET_STATISTICS_update (stats,
2956 gettext_noop ("# connection requests timed out in transport"),
2963 GNUNET_STATISTICS_update (stats,
2964 gettext_noop ("# connection requests timed out in transport"),
2967 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2968 _("Failed to connect to `%4s': transport failed to connect\n"),
2969 GNUNET_i2s (&n->peer));
2972 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2973 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2974 GNUNET_i2s (&n->peer));
2975 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2976 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2977 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (&set_key_retry_task,
2984 * Handle CORE_REQUEST_CONNECT request.
2987 * @param client the client issuing the request
2988 * @param message the "struct ConnectMessage"
2991 handle_client_request_connect (void *cls,
2992 struct GNUNET_SERVER_Client *client,
2993 const struct GNUNET_MessageHeader *message)
2995 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2996 struct Neighbour *n;
2997 struct GNUNET_TIME_Relative timeout;
2999 if (0 == memcmp (&cm->peer,
3001 sizeof (struct GNUNET_PeerIdentity)))
3003 /* In this case a client has asked us to connect to ourselves, not really an error! */
3004 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3007 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
3008 GNUNET_break (ntohl (cm->reserved) == 0);
3009 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3010 n = find_neighbour (&cm->peer);
3012 n = create_neighbour (&cm->peer);
3013 if ( (GNUNET_YES == n->is_connected) ||
3016 if (GNUNET_YES == n->is_connected)
3017 GNUNET_STATISTICS_update (stats,
3018 gettext_noop ("# connection requests ignored (already connected)"),
3023 GNUNET_TRANSPORT_notify_transmit_ready_cancel(n->th);
3024 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3026 sizeof (struct GNUNET_MessageHeader), 0,
3028 ¬ify_transport_connect_done,
3030 GNUNET_break (NULL != n->th);
3031 GNUNET_STATISTICS_update (stats,
3032 gettext_noop ("# connection requests retried (due to repeat request connect)"),
3036 return; /* already connected, or at least trying */
3038 GNUNET_STATISTICS_update (stats,
3039 gettext_noop ("# connection requests received"),
3044 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3045 "Core received `%s' request for `%4s', will try to establish connection\n",
3047 GNUNET_i2s (&cm->peer));
3050 /* ask transport to connect to the peer */
3051 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3053 sizeof (struct GNUNET_MessageHeader), 0,
3055 ¬ify_transport_connect_done,
3057 GNUNET_break (NULL != n->th);
3062 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3063 * the neighbour's struct and retry send_key. Or, if we did not get a
3064 * HELLO, just do nothing.
3066 * @param cls the 'struct Neighbour' to retry sending the key for
3067 * @param peer the peer for which this is the HELLO
3068 * @param hello HELLO message of that peer
3069 * @param err_msg NULL if successful, otherwise contains error message
3072 process_hello_retry_send_key (void *cls,
3073 const struct GNUNET_PeerIdentity *peer,
3074 const struct GNUNET_HELLO_Message *hello,
3075 const char *err_msg)
3077 struct Neighbour *n = cls;
3079 if (err_msg != NULL)
3081 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3082 _("Error in communication with PEERINFO service\n"));
3089 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3090 "Entered `%s' and `%s' is NULL!\n",
3091 "process_hello_retry_send_key",
3095 if (n->public_key != NULL)
3097 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3099 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3100 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3102 GNUNET_STATISTICS_update (stats,
3103 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3111 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3112 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
3113 GNUNET_i2s (&n->peer));
3115 GNUNET_STATISTICS_update (stats,
3116 gettext_noop ("# Delayed connecting due to lack of public key"),
3119 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
3120 n->retry_set_key_task
3121 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3122 &set_key_retry_task, n);
3128 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3129 "Entered `%s' for peer `%4s'\n",
3130 "process_hello_retry_send_key",
3133 if (n->public_key != NULL)
3135 /* already have public key, why are we here? */
3141 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3142 "Received new `%s' message for `%4s', initiating key exchange.\n",
3147 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3148 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3150 GNUNET_STATISTICS_update (stats,
3151 gettext_noop ("# Error extracting public key from HELLO"),
3154 GNUNET_free (n->public_key);
3155 n->public_key = NULL;
3157 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3158 "GNUNET_HELLO_get_key returned awfully\n");
3166 * Send our key (and encrypted PING) to the other peer.
3168 * @param n the other peer
3171 send_key (struct Neighbour *n)
3173 struct MessageEntry *pos;
3174 struct SetKeyMessage *sm;
3175 struct MessageEntry *me;
3176 struct PingMessage pp;
3177 struct PingMessage *pm;
3178 struct GNUNET_CRYPTO_AesInitializationVector iv;
3180 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3182 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3183 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3185 if (n->pitr != NULL)
3188 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3189 "Key exchange in progress with `%4s'.\n",
3190 GNUNET_i2s (&n->peer));
3192 return; /* already in progress */
3194 if (GNUNET_YES != n->is_connected)
3197 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3198 "Not yet connected to peer `%4s'!\n",
3199 GNUNET_i2s (&n->peer));
3203 GNUNET_STATISTICS_update (stats,
3204 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
3207 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3209 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
3211 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3212 ¬ify_encrypted_transmit_ready,
3218 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3219 "Asked to perform key exchange with `%4s'.\n",
3220 GNUNET_i2s (&n->peer));
3222 if (n->public_key == NULL)
3224 /* lookup n's public key, then try again */
3226 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3227 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
3228 GNUNET_i2s (&n->peer));
3230 GNUNET_assert (n->pitr == NULL);
3231 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3233 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
3234 &process_hello_retry_send_key, n);
3237 pos = n->encrypted_head;
3240 if (GNUNET_YES == pos->is_setkey)
3242 if (pos->sender_status == n->status)
3245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3246 "`%s' message for `%4s' queued already\n",
3248 GNUNET_i2s (&n->peer));
3250 goto trigger_processing;
3252 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
3257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3258 "Removing queued `%s' message for `%4s', will create a new one\n",
3260 GNUNET_i2s (&n->peer));
3270 case PEER_STATE_DOWN:
3271 n->status = PEER_STATE_KEY_SENT;
3273 case PEER_STATE_KEY_SENT:
3275 case PEER_STATE_KEY_RECEIVED:
3277 case PEER_STATE_KEY_CONFIRMED:
3285 /* first, set key message */
3286 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3287 sizeof (struct SetKeyMessage) +
3288 sizeof (struct PingMessage));
3289 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
3290 me->priority = SET_KEY_PRIORITY;
3291 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
3292 me->is_setkey = GNUNET_YES;
3293 me->got_slack = GNUNET_YES; /* do not defer this one! */
3294 me->sender_status = n->status;
3295 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3299 sm = (struct SetKeyMessage *) &me[1];
3300 sm->header.size = htons (sizeof (struct SetKeyMessage));
3301 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
3302 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
3303 PEER_STATE_KEY_SENT : n->status));
3305 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3306 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3307 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3308 sizeof (struct GNUNET_PeerIdentity));
3309 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
3310 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
3311 sm->target = n->peer;
3312 GNUNET_assert (GNUNET_OK ==
3313 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
3315 GNUNET_CRYPTO_AesSessionKey),
3317 &sm->encrypted_key));
3318 GNUNET_assert (GNUNET_OK ==
3319 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
3321 pm = (struct PingMessage *) &sm[1];
3322 pm->header.size = htons (sizeof (struct PingMessage));
3323 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
3324 pm->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3325 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
3326 pp.challenge = n->ping_challenge;
3327 pp.target = n->peer;
3329 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3330 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
3332 (unsigned int) n->ping_challenge,
3333 GNUNET_i2s (&n->peer),
3334 (unsigned int) n->encrypt_key.crc32,
3335 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3342 sizeof (struct PingMessage) -
3343 ((void *) &pm->target - (void *) pm));
3344 GNUNET_STATISTICS_update (stats,
3345 gettext_noop ("# SET_KEY and PING messages created"),
3349 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3350 "Have %llu ms left for `%s' transmission.\n",
3351 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).rel_value,
3355 /* trigger queue processing */
3356 process_encrypted_neighbour_queue (n);
3357 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
3358 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
3359 n->retry_set_key_task
3360 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3361 &set_key_retry_task, n);
3366 * We received a SET_KEY message. Validate and update
3367 * our key material and status.
3369 * @param n the neighbour from which we received message m
3370 * @param m the set key message we received
3371 * @param ats performance data
3372 * @param ats_count number of entries in ats (excluding 0-termination)
3375 handle_set_key (struct Neighbour *n,
3376 const struct SetKeyMessage *m,
3377 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3378 uint32_t ats_count);
3383 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3384 * the neighbour's struct and retry handling the set_key message. Or,
3385 * if we did not get a HELLO, just free the set key message.
3387 * @param cls pointer to the set key message
3388 * @param peer the peer for which this is the HELLO
3389 * @param hello HELLO message of that peer
3390 * @param err_msg NULL if successful, otherwise contains error message
3393 process_hello_retry_handle_set_key (void *cls,
3394 const struct GNUNET_PeerIdentity *peer,
3395 const struct GNUNET_HELLO_Message *hello,
3396 const char *err_msg)
3398 struct Neighbour *n = cls;
3399 struct SetKeyMessage *sm = n->skm;
3401 if (err_msg != NULL)
3403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3404 _("Error in communication with PEERINFO service\n"));
3412 if (n->public_key != NULL)
3415 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3416 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
3418 GNUNET_i2s (&n->peer),
3421 handle_set_key (n, sm, NULL, 0);
3425 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3426 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
3428 GNUNET_i2s (&n->peer));
3433 if (n->public_key != NULL)
3434 return; /* multiple HELLOs match!? */
3436 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3437 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3439 GNUNET_break_op (0);
3440 GNUNET_free (n->public_key);
3441 n->public_key = NULL;
3447 * Merge the given performance data with the data we currently
3448 * track for the given neighbour.
3450 * @param n neighbour
3451 * @param ats new performance data
3452 * @param ats_count number of records in ats
3455 update_neighbour_performance (struct Neighbour *n,
3456 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3464 for (i = 0; i < ats_count; i++)
3466 for (j=0;j < n->ats_count; j++)
3468 if (n->ats[j].type == ats[i].type)
3470 n->ats[j].value = ats[i].value;
3474 if (j == n->ats_count)
3476 GNUNET_array_append (n->ats,
3485 * We received a PING message. Validate and transmit
3488 * @param n sender of the PING
3489 * @param m the encrypted PING message itself
3490 * @param ats performance data
3491 * @param ats_count number of entries in ats (excluding 0-termination)
3494 handle_ping (struct Neighbour *n,
3495 const struct PingMessage *m,
3496 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3499 struct PingMessage t;
3500 struct PongMessage tx;
3501 struct PongMessage *tp;
3502 struct MessageEntry *me;
3503 struct GNUNET_CRYPTO_AesInitializationVector iv;
3506 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3507 "Core service receives `%s' request from `%4s'.\n",
3508 "PING", GNUNET_i2s (&n->peer));
3510 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3516 sizeof (struct PingMessage) -
3517 ((void *) &m->target - (void *) m)))
3520 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3521 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
3523 GNUNET_i2s (&t.target),
3524 (unsigned int) t.challenge,
3525 (unsigned int) n->decrypt_key.crc32,
3526 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3529 GNUNET_STATISTICS_update (stats,
3530 gettext_noop ("# PING messages decrypted"),
3533 if (0 != memcmp (&t.target,
3534 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3536 GNUNET_break_op (0);
3539 update_neighbour_performance (n, ats, ats_count);
3540 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3541 sizeof (struct PongMessage));
3542 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3546 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
3547 me->priority = PONG_PRIORITY;
3548 me->size = sizeof (struct PongMessage);
3549 tx.inbound_bw_limit = n->bw_in;
3550 tx.challenge = t.challenge;
3551 tx.target = t.target;
3552 tp = (struct PongMessage *) &me[1];
3553 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
3554 tp->header.size = htons (sizeof (struct PongMessage));
3555 tp->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3556 derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
3561 sizeof (struct PongMessage) -
3562 ((void *) &tp->challenge - (void *) tp));
3563 GNUNET_STATISTICS_update (stats,
3564 gettext_noop ("# PONG messages created"),
3568 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3569 "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
3571 (unsigned int) t.challenge,
3572 (unsigned int) n->encrypt_key.crc32,
3573 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3576 /* trigger queue processing */
3577 process_encrypted_neighbour_queue (n);
3582 * We received a PONG message. Validate and update our status.
3584 * @param n sender of the PONG
3585 * @param m the encrypted PONG message itself
3586 * @param ats performance data
3587 * @param ats_count number of entries in ats (excluding 0-termination)
3590 handle_pong (struct Neighbour *n,
3591 const struct PongMessage *m,
3592 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3595 struct PongMessage t;
3596 struct ConnectNotifyMessage *cnm;
3597 struct GNUNET_CRYPTO_AesInitializationVector iv;
3598 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
3599 struct GNUNET_TRANSPORT_ATS_Information *mats;
3603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3604 "Core service receives `%s' response from `%4s'.\n",
3605 "PONG", GNUNET_i2s (&n->peer));
3607 /* mark as garbage, just to be sure */
3608 memset (&t, 255, sizeof (t));
3609 derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
3616 sizeof (struct PongMessage) -
3617 ((void *) &m->challenge - (void *) m)))
3619 GNUNET_break_op (0);
3622 GNUNET_STATISTICS_update (stats,
3623 gettext_noop ("# PONG messages decrypted"),
3627 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3628 "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
3630 GNUNET_i2s (&t.target),
3631 (unsigned int) t.challenge,
3632 (unsigned int) n->decrypt_key.crc32,
3633 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3636 if ((0 != memcmp (&t.target,
3638 sizeof (struct GNUNET_PeerIdentity))) ||
3639 (n->ping_challenge != t.challenge))
3641 /* PONG malformed */
3643 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3644 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
3646 GNUNET_i2s (&n->peer),
3647 (unsigned int) n->ping_challenge);
3648 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3649 "Received malformed `%s' received from `%4s' with challenge %u\n",
3650 "PONG", GNUNET_i2s (&t.target),
3651 (unsigned int) t.challenge);
3653 GNUNET_break_op (n->ping_challenge != t.challenge);
3658 case PEER_STATE_DOWN:
3659 GNUNET_break (0); /* should be impossible */
3661 case PEER_STATE_KEY_SENT:
3662 GNUNET_break (0); /* should be impossible, how did we decrypt? */
3664 case PEER_STATE_KEY_RECEIVED:
3665 GNUNET_STATISTICS_update (stats,
3666 gettext_noop ("# Session keys confirmed via PONG"),
3669 n->status = PEER_STATE_KEY_CONFIRMED;
3670 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
3672 n->bw_out_external_limit = t.inbound_bw_limit;
3673 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3674 n->bw_out_internal_limit);
3675 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3677 GNUNET_TRANSPORT_set_quota (transport,
3681 GNUNET_TIME_UNIT_FOREVER_REL,
3685 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3686 "Confirmed key via `%s' message for peer `%4s'\n",
3687 "PONG", GNUNET_i2s (&n->peer));
3689 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3691 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3692 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3694 update_neighbour_performance (n, ats, ats_count);
3695 size = sizeof (struct ConnectNotifyMessage) +
3696 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3697 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3700 /* recovery strategy: throw away performance data */
3701 GNUNET_array_grow (n->ats,
3704 size = sizeof (struct PeerStatusNotifyMessage) +
3705 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3707 cnm = (struct ConnectNotifyMessage*) buf;
3708 cnm->header.size = htons (size);
3709 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
3710 cnm->ats_count = htonl (n->ats_count);
3711 cnm->peer = n->peer;
3715 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
3716 mats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3717 mats[n->ats_count].value = htonl (0);
3718 send_to_all_clients (&cnm->header,
3720 GNUNET_CORE_OPTION_SEND_CONNECT);
3721 process_encrypted_neighbour_queue (n);
3723 case PEER_STATE_KEY_CONFIRMED:
3724 n->last_activity = GNUNET_TIME_absolute_get ();
3725 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3726 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3728 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3731 handle_peer_status_change (n);
3741 * We received a SET_KEY message. Validate and update
3742 * our key material and status.
3744 * @param n the neighbour from which we received message m
3745 * @param m the set key message we received
3746 * @param ats performance data
3747 * @param ats_count number of entries in ats (excluding 0-termination)
3750 handle_set_key (struct Neighbour *n,
3751 const struct SetKeyMessage *m,
3752 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3755 struct SetKeyMessage *m_cpy;
3756 struct GNUNET_TIME_Absolute t;
3757 struct GNUNET_CRYPTO_AesSessionKey k;
3758 struct PingMessage *ping;
3759 struct PongMessage *pong;
3760 enum PeerStateMachine sender_status;
3763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3764 "Core service receives `%s' request from `%4s'.\n",
3765 "SET_KEY", GNUNET_i2s (&n->peer));
3767 if (n->public_key == NULL)
3769 if (n->pitr != NULL)
3772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3773 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3779 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3780 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3782 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3783 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3784 /* lookup n's public key, then try again */
3785 GNUNET_assert (n->skm == NULL);
3787 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3789 GNUNET_TIME_UNIT_MINUTES,
3790 &process_hello_retry_handle_set_key, n);
3791 GNUNET_STATISTICS_update (stats,
3792 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3797 if (0 != memcmp (&m->target,
3799 sizeof (struct GNUNET_PeerIdentity)))
3801 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3802 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3804 GNUNET_i2s (&m->target));
3807 if ((ntohl (m->purpose.size) !=
3808 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3809 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3810 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3811 sizeof (struct GNUNET_PeerIdentity)) ||
3813 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3814 &m->purpose, &m->signature, n->public_key)))
3816 /* invalid signature */
3817 GNUNET_break_op (0);
3820 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3821 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3822 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3823 (t.abs_value < n->decrypt_key_created.abs_value))
3825 /* this could rarely happen due to massive re-ordering of
3826 messages on the network level, but is most likely either
3827 a bug or some adversary messing with us. Report. */
3828 GNUNET_break_op (0);
3832 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3833 "Decrypting key material.\n");
3835 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3838 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3839 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3840 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3842 /* failed to decrypt !? */
3843 GNUNET_break_op (0);
3846 GNUNET_STATISTICS_update (stats,
3847 gettext_noop ("# SET_KEY messages decrypted"),
3851 if (n->decrypt_key_created.abs_value != t.abs_value)
3853 /* fresh key, reset sequence numbers */
3854 n->last_sequence_number_received = 0;
3855 n->last_packets_bitmap = 0;
3856 n->decrypt_key_created = t;
3858 update_neighbour_performance (n, ats, ats_count);
3859 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3862 case PEER_STATE_DOWN:
3863 n->status = PEER_STATE_KEY_RECEIVED;
3865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3866 "Responding to `%s' with my own key.\n", "SET_KEY");
3870 case PEER_STATE_KEY_SENT:
3871 case PEER_STATE_KEY_RECEIVED:
3872 n->status = PEER_STATE_KEY_RECEIVED;
3873 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3874 (sender_status != PEER_STATE_KEY_CONFIRMED))
3877 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3878 "Responding to `%s' with my own key (other peer has status %u).\n",
3880 (unsigned int) sender_status);
3885 case PEER_STATE_KEY_CONFIRMED:
3886 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3887 (sender_status != PEER_STATE_KEY_CONFIRMED))
3890 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3891 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3893 (unsigned int) sender_status);
3902 if (n->pending_ping != NULL)
3904 ping = n->pending_ping;
3905 n->pending_ping = NULL;
3906 handle_ping (n, ping, NULL, 0);
3909 if (n->pending_pong != NULL)
3911 pong = n->pending_pong;
3912 n->pending_pong = NULL;
3913 handle_pong (n, pong, NULL, 0);
3920 * Send a P2P message to a client.
3922 * @param sender who sent us the message?
3923 * @param client who should we give the message to?
3924 * @param m contains the message to transmit
3925 * @param msize number of bytes in buf to transmit
3928 send_p2p_message_to_client (struct Neighbour *sender,
3929 struct Client *client,
3930 const void *m, size_t msize)
3932 size_t size = msize + sizeof (struct NotifyTrafficMessage) +
3933 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3935 struct NotifyTrafficMessage *ntm;
3936 struct GNUNET_TRANSPORT_ATS_Information *ats;
3938 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3941 /* recovery strategy: throw performance data away... */
3942 GNUNET_array_grow (sender->ats,
3945 size = msize + sizeof (struct NotifyTrafficMessage) +
3946 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3949 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3950 "Core service passes message from `%4s' of type %u to client.\n",
3951 GNUNET_i2s(&sender->peer),
3952 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3954 ntm = (struct NotifyTrafficMessage *) buf;
3955 ntm->header.size = htons (size);
3956 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3957 ntm->ats_count = htonl (sender->ats_count);
3958 ntm->peer = sender->peer;
3962 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * sender->ats_count);
3963 ats[sender->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3964 ats[sender->ats_count].value = htonl (0);
3965 memcpy (&ats[sender->ats_count+1],
3968 send_to_client (client, &ntm->header, GNUNET_YES);
3973 * Deliver P2P message to interested clients.
3975 * @param cls always NULL
3976 * @param client who sent us the message (struct Neighbour)
3977 * @param m the message
3980 deliver_message (void *cls,
3982 const struct GNUNET_MessageHeader *m)
3984 struct Neighbour *sender = client;
3985 size_t msize = ntohs (m->size);
3987 struct Client *cpos;
3993 type = ntohs (m->type);
3995 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3996 "Received encapsulated message of type %u and size %u from `%4s'\n",
3997 (unsigned int) type,
3999 GNUNET_i2s (&sender->peer));
4001 GNUNET_snprintf (buf,
4003 gettext_noop ("# bytes of messages of type %u received"),
4004 (unsigned int) type);
4005 GNUNET_STATISTICS_set (stats,
4009 dropped = GNUNET_YES;
4011 while (cpos != NULL)
4013 deliver_full = GNUNET_NO;
4014 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
4015 deliver_full = GNUNET_YES;
4018 for (tpos = 0; tpos < cpos->tcnt; tpos++)
4020 if (type != cpos->types[tpos])
4022 deliver_full = GNUNET_YES;
4026 if (GNUNET_YES == deliver_full)
4028 send_p2p_message_to_client (sender, cpos, m, msize);
4029 dropped = GNUNET_NO;
4031 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
4033 send_p2p_message_to_client (sender, cpos, m,
4034 sizeof (struct GNUNET_MessageHeader));
4038 if (dropped == GNUNET_YES)
4041 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4042 "Message of type %u from `%4s' not delivered to any client.\n",
4043 (unsigned int) type,
4044 GNUNET_i2s (&sender->peer));
4046 GNUNET_STATISTICS_update (stats,
4047 gettext_noop ("# messages not delivered to any client"),
4054 * We received an encrypted message. Decrypt, validate and
4055 * pass on to the appropriate clients.
4057 * @param n target of the message
4058 * @param m encrypted message
4059 * @param ats performance data
4060 * @param ats_count number of entries in ats (excluding 0-termination)
4063 handle_encrypted_message (struct Neighbour *n,
4064 const struct EncryptedMessage *m,
4065 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4068 size_t size = ntohs (m->header.size);
4070 struct EncryptedMessage *pt; /* plaintext */
4073 struct GNUNET_TIME_Absolute t;
4074 struct GNUNET_CRYPTO_AesInitializationVector iv;
4075 struct GNUNET_CRYPTO_AuthKey auth_key;
4078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4079 "Core service receives `%s' request from `%4s'.\n",
4080 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
4083 derive_auth_key (&auth_key,
4086 n->decrypt_key_created);
4087 GNUNET_CRYPTO_hmac (&auth_key,
4088 &m->sequence_number,
4089 size - ENCRYPTED_HEADER_SIZE, &ph);
4091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4092 "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
4093 (unsigned int) size - ENCRYPTED_HEADER_SIZE,
4094 GNUNET_CRYPTO_crc32_n (&m->sequence_number,
4095 size - ENCRYPTED_HEADER_SIZE),
4099 if (0 != memcmp (&ph,
4101 sizeof (GNUNET_HashCode)))
4103 /* checksum failed */
4104 GNUNET_break_op (0);
4107 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
4112 &m->sequence_number,
4113 &buf[ENCRYPTED_HEADER_SIZE],
4114 size - ENCRYPTED_HEADER_SIZE))
4116 pt = (struct EncryptedMessage *) buf;
4118 /* validate sequence number */
4119 snum = ntohl (pt->sequence_number);
4120 if (n->last_sequence_number_received == snum)
4122 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4123 "Received duplicate message, ignoring.\n");
4124 /* duplicate, ignore */
4125 GNUNET_STATISTICS_set (stats,
4126 gettext_noop ("# bytes dropped (duplicates)"),
4131 if ((n->last_sequence_number_received > snum) &&
4132 (n->last_sequence_number_received - snum > 32))
4134 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4135 "Received ancient out of sequence message, ignoring.\n");
4136 /* ancient out of sequence, ignore */
4137 GNUNET_STATISTICS_set (stats,
4138 gettext_noop ("# bytes dropped (out of sequence)"),
4143 if (n->last_sequence_number_received > snum)
4145 unsigned int rotbit =
4146 1 << (n->last_sequence_number_received - snum - 1);
4147 if ((n->last_packets_bitmap & rotbit) != 0)
4149 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4150 "Received duplicate message, ignoring.\n");
4151 GNUNET_STATISTICS_set (stats,
4152 gettext_noop ("# bytes dropped (duplicates)"),
4155 /* duplicate, ignore */
4158 n->last_packets_bitmap |= rotbit;
4160 if (n->last_sequence_number_received < snum)
4162 int shift = (snum - n->last_sequence_number_received);
4163 if (shift >= 8 * sizeof(n->last_packets_bitmap))
4164 n->last_packets_bitmap = 0;
4166 n->last_packets_bitmap <<= shift;
4167 n->last_sequence_number_received = snum;
4170 /* check timestamp */
4171 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
4172 if (GNUNET_TIME_absolute_get_duration (t).rel_value > MAX_MESSAGE_AGE.rel_value)
4174 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4176 ("Message received far too old (%llu ms). Content ignored.\n"),
4177 GNUNET_TIME_absolute_get_duration (t).rel_value);
4178 GNUNET_STATISTICS_set (stats,
4179 gettext_noop ("# bytes dropped (ancient message)"),
4185 /* process decrypted message(s) */
4186 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
4188 #if DEBUG_CORE_SET_QUOTA
4189 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4190 "Received %u b/s as new inbound limit for peer `%4s'\n",
4191 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
4192 GNUNET_i2s (&n->peer));
4194 n->bw_out_external_limit = pt->inbound_bw_limit;
4195 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
4196 n->bw_out_internal_limit);
4197 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
4199 GNUNET_TRANSPORT_set_quota (transport,
4203 GNUNET_TIME_UNIT_FOREVER_REL,
4206 n->last_activity = GNUNET_TIME_absolute_get ();
4207 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4208 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4210 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4213 GNUNET_STATISTICS_set (stats,
4214 gettext_noop ("# bytes of payload decrypted"),
4215 size - sizeof (struct EncryptedMessage),
4217 handle_peer_status_change (n);
4218 update_neighbour_performance (n, ats, ats_count);
4219 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
4221 &buf[sizeof (struct EncryptedMessage)],
4222 size - sizeof (struct EncryptedMessage),
4223 GNUNET_YES, GNUNET_NO))
4224 GNUNET_break_op (0);
4229 * Function called by the transport for each received message.
4231 * @param cls closure
4232 * @param peer (claimed) identity of the other peer
4233 * @param message the message
4234 * @param ats performance data
4235 * @param ats_count number of entries in ats (excluding 0-termination)
4238 handle_transport_receive (void *cls,
4239 const struct GNUNET_PeerIdentity *peer,
4240 const struct GNUNET_MessageHeader *message,
4241 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4244 struct Neighbour *n;
4245 struct GNUNET_TIME_Absolute now;
4252 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4253 "Received message of type %u from `%4s', demultiplexing.\n",
4254 (unsigned int) ntohs (message->type),
4257 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4262 n = find_neighbour (peer);
4264 n = create_neighbour (peer);
4265 changed = GNUNET_NO;
4266 up = (n->status == PEER_STATE_KEY_CONFIRMED);
4267 type = ntohs (message->type);
4268 size = ntohs (message->size);
4271 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
4272 if (size != sizeof (struct SetKeyMessage))
4274 GNUNET_break_op (0);
4277 GNUNET_STATISTICS_update (stats,
4278 gettext_noop ("# session keys received"),
4282 (const struct SetKeyMessage *) message,
4285 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
4286 if (size < sizeof (struct EncryptedMessage) +
4287 sizeof (struct GNUNET_MessageHeader))
4289 GNUNET_break_op (0);
4292 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4293 (n->status != PEER_STATE_KEY_CONFIRMED))
4295 GNUNET_STATISTICS_update (stats,
4296 gettext_noop ("# failed to decrypt message (no session key)"),
4302 handle_encrypted_message (n,
4303 (const struct EncryptedMessage *) message,
4306 case GNUNET_MESSAGE_TYPE_CORE_PING:
4307 if (size != sizeof (struct PingMessage))
4309 GNUNET_break_op (0);
4312 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
4313 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4314 (n->status != PEER_STATE_KEY_CONFIRMED))
4317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4318 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4319 "PING", GNUNET_i2s (&n->peer));
4321 GNUNET_free_non_null (n->pending_ping);
4322 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
4323 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
4326 handle_ping (n, (const struct PingMessage *) message,
4329 case GNUNET_MESSAGE_TYPE_CORE_PONG:
4330 if (size != sizeof (struct PongMessage))
4332 GNUNET_break_op (0);
4335 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
4336 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
4337 (n->status != PEER_STATE_KEY_CONFIRMED) )
4340 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4341 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4342 "PONG", GNUNET_i2s (&n->peer));
4344 GNUNET_free_non_null (n->pending_pong);
4345 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
4346 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
4349 handle_pong (n, (const struct PongMessage *) message,
4353 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4354 _("Unsupported message of type %u received.\n"),
4355 (unsigned int) type);
4358 if (n->status == PEER_STATE_KEY_CONFIRMED)
4360 now = GNUNET_TIME_absolute_get ();
4361 n->last_activity = now;
4362 changed = GNUNET_YES;
4365 GNUNET_STATISTICS_update (stats,
4366 gettext_noop ("# established sessions"),
4369 n->time_established = now;
4371 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4372 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4374 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4379 handle_peer_status_change (n);
4384 * Function that recalculates the bandwidth quota for the
4385 * given neighbour and transmits it to the transport service.
4387 * @param cls neighbour for the quota update
4391 neighbour_quota_update (void *cls,
4392 const struct GNUNET_SCHEDULER_TaskContext *tc)
4394 struct Neighbour *n = cls;
4395 struct GNUNET_BANDWIDTH_Value32NBO q_in;
4396 struct GNUNET_BANDWIDTH_Value32NBO q_out;
4397 struct GNUNET_BANDWIDTH_Value32NBO q_out_min;
4400 unsigned long long distributable;
4401 uint64_t need_per_peer;
4402 uint64_t need_per_second;
4403 unsigned int neighbour_count;
4406 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4407 "Neighbour quota update calculation running for peer `%4s'\n",
4408 GNUNET_i2s (&n->peer));
4410 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
4411 /* calculate relative preference among all neighbours;
4412 divides by a bit more to avoid division by zero AND to
4413 account for possibility of new neighbours joining any time
4414 AND to convert to double... */
4415 neighbour_count = GNUNET_CONTAINER_multihashmap_size (neighbours);
4416 if (neighbour_count == 0)
4418 if (preference_sum == 0)
4420 pref_rel = 1.0 / (double) neighbour_count;
4424 pref_rel = n->current_preference / preference_sum;
4426 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
4427 GNUNET_TIME_UNIT_SECONDS);
4428 need_per_second = need_per_peer * neighbour_count;
4430 /* calculate inbound bandwidth per peer */
4432 if (bandwidth_target_in_bps > need_per_second)
4433 distributable = bandwidth_target_in_bps - need_per_second;
4434 share = distributable * pref_rel;
4435 if (share + need_per_peer > UINT32_MAX)
4436 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4438 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4440 /* calculate outbound bandwidth per peer */
4442 if (bandwidth_target_out_bps > need_per_second)
4443 distributable = bandwidth_target_out_bps - need_per_second;
4444 share = distributable * pref_rel;
4445 if (share + need_per_peer > UINT32_MAX)
4446 q_out = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4448 q_out = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4449 n->bw_out_internal_limit = q_out;
4451 q_out_min = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit, n->bw_out_internal_limit);
4452 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window, n->bw_out);
4454 /* check if we want to disconnect for good due to inactivity */
4455 if ( (GNUNET_TIME_absolute_get_duration (get_neighbour_timeout (n)).rel_value > 0) &&
4456 (GNUNET_TIME_absolute_get_duration (n->time_established).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) )
4459 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4460 "Forcing disconnect of `%4s' due to inactivity\n",
4461 GNUNET_i2s (&n->peer));
4463 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
4465 #if DEBUG_CORE_QUOTA
4466 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4467 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
4468 GNUNET_i2s (&n->peer),
4469 (unsigned int) ntohl (q_in.value__),
4470 bandwidth_target_out_bps,
4471 (unsigned int) ntohl (n->bw_in.value__),
4472 (unsigned int) ntohl (n->bw_out.value__),
4473 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
4475 if ((n->bw_in.value__ != q_in.value__) || (n->bw_out.value__ != q_out_min.value__))
4477 if (n->bw_in.value__ != q_in.value__)
4479 if (n->bw_out.value__ != q_out_min.value__)
4480 n->bw_out = q_out_min;
4481 if (GNUNET_YES == n->is_connected)
4482 GNUNET_TRANSPORT_set_quota (transport,
4486 GNUNET_TIME_UNIT_FOREVER_REL,
4488 handle_peer_status_change (n);
4490 schedule_quota_update (n);
4495 * Function called by transport to notify us that
4496 * a peer connected to us (on the network level).
4498 * @param cls closure
4499 * @param peer the peer that connected
4500 * @param ats performance data
4501 * @param ats_count number of entries in ats (excluding 0-termination)
4504 handle_transport_notify_connect (void *cls,
4505 const struct GNUNET_PeerIdentity *peer,
4506 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4509 struct Neighbour *n;
4511 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4516 n = find_neighbour (peer);
4519 if (GNUNET_YES == n->is_connected)
4521 /* duplicate connect notification!? */
4528 n = create_neighbour (peer);
4530 GNUNET_STATISTICS_update (stats,
4531 gettext_noop ("# peers connected (transport)"),
4534 n->is_connected = GNUNET_YES;
4535 update_neighbour_performance (n, ats, ats_count);
4536 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
4539 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
4543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4544 "Received connection from `%4s'.\n",
4545 GNUNET_i2s (&n->peer));
4547 GNUNET_TRANSPORT_set_quota (transport,
4551 GNUNET_TIME_UNIT_FOREVER_REL,
4558 * Function called by transport telling us that a peer
4561 * @param cls closure
4562 * @param peer the peer that disconnected
4565 handle_transport_notify_disconnect (void *cls,
4566 const struct GNUNET_PeerIdentity *peer)
4568 struct DisconnectNotifyMessage cnm;
4569 struct Neighbour *n;
4570 struct ClientActiveRequest *car;
4571 struct GNUNET_TIME_Relative left;
4574 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4575 "Peer `%4s' disconnected from us; received notification from transport.\n",
4578 n = find_neighbour (peer);
4584 GNUNET_break (n->is_connected == GNUNET_YES);
4585 if (n->status == PEER_STATE_KEY_CONFIRMED)
4587 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
4588 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
4589 cnm.reserved = htonl (0);
4591 send_to_all_clients (&cnm.header, GNUNET_NO, GNUNET_CORE_OPTION_SEND_DISCONNECT);
4592 GNUNET_STATISTICS_update (stats,
4593 gettext_noop ("# established sessions"),
4598 /* On transport disconnect transport doesn't cancel requests, so must do so here. */
4601 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
4604 n->is_connected = GNUNET_NO;
4605 n->status = PEER_STATE_DOWN;
4606 while (NULL != (car = n->active_client_request_head))
4608 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
4609 n->active_client_request_tail,
4611 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
4612 &n->peer.hashPubKey,
4617 GNUNET_STATISTICS_update (stats,
4618 gettext_noop ("# peers connected (transport)"),
4621 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
4622 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
4623 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4624 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
4625 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
4627 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
4628 &consider_free_task,
4634 * Wrapper around 'free_neighbour'; helper for 'cleaning_task'.
4637 free_neighbour_helper (void *cls,
4638 const GNUNET_HashCode *key,
4641 struct Neighbour *n = value;
4649 * Last task run during shutdown. Disconnects us from
4653 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4658 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4659 "Core service shutting down.\n");
4661 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
4662 &free_neighbour_helper,
4664 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
4666 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), 0, GNUNET_NO);
4667 GNUNET_assert (transport != NULL);
4668 GNUNET_TRANSPORT_disconnect (transport);
4670 GNUNET_SERVER_notification_context_destroy (notifier);
4672 while (NULL != (c = clients))
4673 handle_client_disconnect (NULL, c->client_handle);
4674 if (my_private_key != NULL)
4675 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4677 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4678 if (peerinfo != NULL)
4679 GNUNET_PEERINFO_disconnect (peerinfo);
4681 GNUNET_SERVER_mst_destroy (mst);
4686 * Initiate core service.
4688 * @param cls closure
4689 * @param server the initialized server
4690 * @param c configuration to use
4694 struct GNUNET_SERVER_Handle *server,
4695 const struct GNUNET_CONFIGURATION_Handle *c)
4697 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4698 {&handle_client_init, NULL,
4699 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
4700 {&handle_client_iterate_peers, NULL,
4701 GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS,
4702 sizeof (struct GNUNET_MessageHeader)},
4703 {&handle_client_have_peer, NULL,
4704 GNUNET_MESSAGE_TYPE_CORE_PEER_CONNECTED,
4705 sizeof (struct GNUNET_MessageHeader) + sizeof(struct GNUNET_PeerIdentity)},
4706 {&handle_client_request_info, NULL,
4707 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
4708 sizeof (struct RequestInfoMessage)},
4709 {&handle_client_send_request, NULL,
4710 GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST,
4711 sizeof (struct SendMessageRequest)},
4712 {&handle_client_send, NULL,
4713 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
4714 {&handle_client_request_connect, NULL,
4715 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
4716 sizeof (struct ConnectMessage)},
4722 /* parse configuration */
4725 GNUNET_CONFIGURATION_get_value_number (c,
4728 &bandwidth_target_in_bps)) ||
4730 GNUNET_CONFIGURATION_get_value_number (c,
4733 &bandwidth_target_out_bps)) ||
4735 GNUNET_CONFIGURATION_get_value_filename (c,
4737 "HOSTKEY", &keyfile)))
4739 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4741 ("Core service is lacking key configuration settings. Exiting.\n"));
4742 GNUNET_SCHEDULER_shutdown ();
4745 peerinfo = GNUNET_PEERINFO_connect (cfg);
4746 if (NULL == peerinfo)
4748 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4749 _("Could not access PEERINFO service. Exiting.\n"));
4750 GNUNET_SCHEDULER_shutdown ();
4751 GNUNET_free (keyfile);
4754 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4755 GNUNET_free (keyfile);
4756 if (my_private_key == NULL)
4758 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4759 _("Core service could not access hostkey. Exiting.\n"));
4760 GNUNET_PEERINFO_disconnect (peerinfo);
4761 GNUNET_SCHEDULER_shutdown ();
4764 neighbours = GNUNET_CONTAINER_multihashmap_create (128);
4765 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4766 GNUNET_CRYPTO_hash (&my_public_key,
4767 sizeof (my_public_key), &my_identity.hashPubKey);
4768 self.public_key = &my_public_key;
4769 self.peer = my_identity;
4770 self.last_activity = GNUNET_TIME_UNIT_FOREVER_ABS;
4771 self.status = PEER_STATE_KEY_CONFIRMED;
4772 self.is_connected = GNUNET_YES;
4773 /* setup notification */
4774 notifier = GNUNET_SERVER_notification_context_create (server,
4776 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
4777 /* setup transport connection */
4778 transport = GNUNET_TRANSPORT_connect (cfg,
4781 &handle_transport_receive,
4782 &handle_transport_notify_connect,
4783 &handle_transport_notify_disconnect);
4784 GNUNET_assert (NULL != transport);
4785 stats = GNUNET_STATISTICS_create ("core", cfg);
4787 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded CORE_SEND requests"), 0, GNUNET_NO);
4788 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 0, GNUNET_NO);
4790 mst = GNUNET_SERVER_mst_create (&deliver_message,
4792 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
4793 &cleaning_task, NULL);
4794 /* process client requests */
4795 GNUNET_SERVER_add_handlers (server, handlers);
4796 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4797 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
4803 * The main function for the transport service.
4805 * @param argc number of arguments from the command line
4806 * @param argv command line arguments
4807 * @return 0 ok, 1 on error
4810 main (int argc, char *const *argv)
4812 return (GNUNET_OK ==
4813 GNUNET_SERVICE_run (argc,
4816 GNUNET_SERVICE_OPTION_NONE,
4817 &run, NULL)) ? 0 : 1;
4820 /* end of gnunet-service-core.c */