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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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) )
1115 return; /* no pending requests */
1116 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1117 n->active_client_request_tail,
1122 car = n->active_client_request_head;
1124 return; /* no pending requests */
1126 #if DEBUG_CORE_CLIENT
1127 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1128 "Permitting client transmission request to `%s'\n",
1129 GNUNET_i2s (&n->peer));
1132 GNUNET_assert (GNUNET_YES ==
1133 GNUNET_CONTAINER_multihashmap_remove (c->requests,
1134 &n->peer.hashPubKey,
1136 smr.header.size = htons (sizeof (struct SendMessageReady));
1137 smr.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_READY);
1138 smr.size = htons (car->msize);
1139 smr.smr_id = car->smr_id;
1141 send_to_client (c, &smr.header, GNUNET_NO);
1147 * Handle CORE_SEND_REQUEST message.
1150 handle_client_send_request (void *cls,
1151 struct GNUNET_SERVER_Client *client,
1152 const struct GNUNET_MessageHeader *message)
1154 const struct SendMessageRequest *req;
1155 struct Neighbour *n;
1157 struct ClientActiveRequest *car;
1159 req = (const struct SendMessageRequest*) message;
1160 if (0 == memcmp (&req->peer,
1162 sizeof (struct GNUNET_PeerIdentity)))
1165 n = find_neighbour (&req->peer);
1167 (GNUNET_YES != n->is_connected) ||
1168 (n->status != PEER_STATE_KEY_CONFIRMED) )
1170 /* neighbour must have disconnected since request was issued,
1171 ignore (client will realize it once it processes the
1172 disconnect notification) */
1173 #if DEBUG_CORE_CLIENT
1174 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1175 "Dropped client request for transmission (am disconnected)\n");
1177 GNUNET_STATISTICS_update (stats,
1178 gettext_noop ("# send requests dropped (disconnected)"),
1181 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1185 while ( (c != NULL) &&
1186 (c->client_handle != client) )
1190 /* client did not send INIT first! */
1192 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1195 if (c->requests == NULL)
1196 c->requests = GNUNET_CONTAINER_multihashmap_create (16);
1197 #if DEBUG_CORE_CLIENT
1198 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1199 "Received client transmission request. queueing\n");
1201 car = GNUNET_CONTAINER_multihashmap_get (c->requests,
1202 &req->peer.hashPubKey);
1205 /* create new entry */
1206 car = GNUNET_malloc (sizeof (struct ClientActiveRequest));
1207 GNUNET_assert (GNUNET_OK ==
1208 GNUNET_CONTAINER_multihashmap_put (c->requests,
1209 &req->peer.hashPubKey,
1211 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
1212 GNUNET_CONTAINER_DLL_insert (n->active_client_request_head,
1213 n->active_client_request_tail,
1217 car->deadline = GNUNET_TIME_absolute_ntoh (req->deadline);
1218 car->priority = ntohl (req->priority);
1219 car->queue_size = ntohl (req->queue_size);
1220 car->msize = ntohs (req->size);
1221 car->smr_id = req->smr_id;
1222 schedule_peer_messages (n);
1223 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1228 * Notify client about an existing connection to one of our neighbours.
1231 notify_client_about_neighbour (void *cls,
1232 const GNUNET_HashCode *key,
1235 struct Client *c = cls;
1236 struct Neighbour *n = value;
1238 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1239 struct GNUNET_TRANSPORT_ATS_Information *ats;
1240 struct ConnectNotifyMessage *cnm;
1242 size = sizeof (struct ConnectNotifyMessage) +
1243 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1244 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1247 /* recovery strategy: throw away performance data */
1248 GNUNET_array_grow (n->ats,
1251 size = sizeof (struct ConnectNotifyMessage) +
1252 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1254 cnm = (struct ConnectNotifyMessage*) buf;
1255 cnm->header.size = htons (size);
1256 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1257 cnm->ats_count = htonl (n->ats_count);
1261 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * n->ats_count);
1262 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1263 ats[n->ats_count].value = htonl (0);
1264 if (n->status == PEER_STATE_KEY_CONFIRMED)
1266 #if DEBUG_CORE_CLIENT
1267 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1268 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
1270 cnm->peer = n->peer;
1271 send_to_client (c, &cnm->header, GNUNET_NO);
1279 * Handle CORE_INIT request.
1282 handle_client_init (void *cls,
1283 struct GNUNET_SERVER_Client *client,
1284 const struct GNUNET_MessageHeader *message)
1286 const struct InitMessage *im;
1287 struct InitReplyMessage irm;
1290 const uint16_t *types;
1294 #if DEBUG_CORE_CLIENT
1295 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1296 "Client connecting to core service with `%s' message\n",
1299 /* check that we don't have an entry already */
1303 if (client == c->client_handle)
1306 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1311 msize = ntohs (message->size);
1312 if (msize < sizeof (struct InitMessage))
1315 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1318 GNUNET_SERVER_notification_context_add (notifier, client);
1319 im = (const struct InitMessage *) message;
1320 types = (const uint16_t *) &im[1];
1321 msize -= sizeof (struct InitMessage);
1322 c = GNUNET_malloc (sizeof (struct Client) + msize);
1323 c->client_handle = client;
1326 c->tcnt = msize / sizeof (uint16_t);
1327 c->types = (const uint16_t *) &c[1];
1328 wtypes = (uint16_t *) &c[1];
1329 for (i=0;i<c->tcnt;i++)
1330 wtypes[i] = ntohs (types[i]);
1331 c->options = ntohl (im->options);
1332 #if DEBUG_CORE_CLIENT
1333 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1334 "Client %p is interested in %u message types\n",
1336 (unsigned int) c->tcnt);
1338 /* send init reply message */
1339 irm.header.size = htons (sizeof (struct InitReplyMessage));
1340 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
1341 irm.reserved = htonl (0);
1342 memcpy (&irm.publicKey,
1344 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1345 #if DEBUG_CORE_CLIENT
1346 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1347 "Sending `%s' message to client.\n", "INIT_REPLY");
1349 send_to_client (c, &irm.header, GNUNET_NO);
1350 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
1352 /* notify new client about existing neighbours */
1353 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
1354 ¬ify_client_about_neighbour,
1357 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1362 * Free client request records.
1365 * @param key identity of peer for which this is an active request
1366 * @param value the 'struct ClientActiveRequest' to free
1367 * @return GNUNET_YES (continue iteration)
1370 destroy_active_client_request (void *cls,
1371 const GNUNET_HashCode *key,
1374 struct ClientActiveRequest *car = value;
1375 struct Neighbour *n;
1376 struct GNUNET_PeerIdentity peer;
1378 peer.hashPubKey = *key;
1379 n = find_neighbour (&peer);
1380 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1381 n->active_client_request_tail,
1389 * A client disconnected, clean up.
1391 * @param cls closure
1392 * @param client identification of the client
1395 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
1398 struct Client *prev;
1402 #if DEBUG_CORE_CLIENT
1403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1404 "Client %p has disconnected from core service.\n",
1411 if (client == pos->client_handle)
1418 /* client never sent INIT */
1422 clients = pos->next;
1424 prev->next = pos->next;
1425 if (pos->requests != NULL)
1427 GNUNET_CONTAINER_multihashmap_iterate (pos->requests,
1428 &destroy_active_client_request,
1430 GNUNET_CONTAINER_multihashmap_destroy (pos->requests);
1437 * Helper function for handle_client_iterate_peers.
1440 queue_connect_message (void *cls,
1441 const GNUNET_HashCode *key,
1444 struct GNUNET_SERVER_TransmitContext *tc = cls;
1445 struct Neighbour *n = value;
1446 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1447 struct GNUNET_TRANSPORT_ATS_Information *ats;
1449 struct ConnectNotifyMessage *cnm;
1451 cnm = (struct ConnectNotifyMessage*) buf;
1452 if (n->status != PEER_STATE_KEY_CONFIRMED)
1454 size = sizeof (struct ConnectNotifyMessage) +
1455 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1456 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1459 /* recovery strategy: throw away performance data */
1460 GNUNET_array_grow (n->ats,
1463 size = sizeof (struct PeerStatusNotifyMessage) +
1464 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1466 cnm = (struct ConnectNotifyMessage*) buf;
1467 cnm->header.size = htons (size);
1468 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1469 cnm->ats_count = htonl (n->ats_count);
1473 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
1474 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1475 ats[n->ats_count].value = htonl (0);
1476 #if DEBUG_CORE_CLIENT
1477 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1478 "Sending `%s' message to client.\n",
1481 cnm->peer = n->peer;
1482 GNUNET_SERVER_transmit_context_append_message (tc,
1489 * Handle CORE_ITERATE_PEERS request.
1492 * @param client client sending the iteration request
1493 * @param message iteration request message
1496 handle_client_iterate_peers (void *cls,
1497 struct GNUNET_SERVER_Client *client,
1498 const struct GNUNET_MessageHeader *message)
1501 struct GNUNET_MessageHeader done_msg;
1502 struct GNUNET_SERVER_TransmitContext *tc;
1504 /* notify new client about existing neighbours */
1505 tc = GNUNET_SERVER_transmit_context_create (client);
1506 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &queue_connect_message, tc);
1507 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1508 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
1509 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
1510 GNUNET_SERVER_transmit_context_run (tc,
1511 GNUNET_TIME_UNIT_FOREVER_REL);
1516 * Handle REQUEST_INFO request.
1519 handle_client_request_info (void *cls,
1520 struct GNUNET_SERVER_Client *client,
1521 const struct GNUNET_MessageHeader *message)
1523 const struct RequestInfoMessage *rcm;
1525 struct Neighbour *n;
1526 struct ConfigurationInfoMessage cim;
1527 int32_t want_reserv;
1529 unsigned long long old_preference;
1531 #if DEBUG_CORE_CLIENT
1532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1533 "Core service receives `%s' request.\n", "REQUEST_INFO");
1538 if (client == pos->client_handle)
1545 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1549 rcm = (const struct RequestInfoMessage *) message;
1550 n = find_neighbour (&rcm->peer);
1551 memset (&cim, 0, sizeof (cim));
1554 want_reserv = ntohl (rcm->reserve_inbound);
1555 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1557 n->bw_out_internal_limit = rcm->limit_outbound;
1558 if (n->bw_out.value__ != GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1559 n->bw_out_external_limit).value__)
1561 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1562 n->bw_out_external_limit);
1563 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1565 GNUNET_TRANSPORT_set_quota (transport,
1569 GNUNET_TIME_UNIT_FOREVER_REL,
1571 handle_peer_status_change (n);
1574 if (want_reserv < 0)
1576 got_reserv = want_reserv;
1578 else if (want_reserv > 0)
1580 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1581 want_reserv).rel_value == 0)
1582 got_reserv = want_reserv;
1584 got_reserv = 0; /* all or nothing */
1588 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1590 old_preference = n->current_preference;
1591 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1592 if (old_preference > n->current_preference)
1594 /* overflow; cap at maximum value */
1595 n->current_preference = ULLONG_MAX;
1597 update_preference_sum (n->current_preference - old_preference);
1598 #if DEBUG_CORE_QUOTA
1599 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1600 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1602 GNUNET_i2s (&rcm->peer),
1605 cim.reserved_amount = htonl (got_reserv);
1606 cim.rim_id = rcm->rim_id;
1607 cim.bw_out = n->bw_out;
1608 cim.preference = n->current_preference;
1610 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1611 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1612 cim.peer = rcm->peer;
1613 #if DEBUG_CORE_CLIENT
1614 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1615 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1617 send_to_client (pos, &cim.header, GNUNET_NO);
1618 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1623 * Free the given entry for the neighbour (it has
1624 * already been removed from the list at this point).
1626 * @param n neighbour to free
1629 free_neighbour (struct Neighbour *n)
1631 struct MessageEntry *m;
1632 struct ClientActiveRequest *car;
1635 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1636 "Destroying neighbour entry for peer `%4s'\n",
1637 GNUNET_i2s (&n->peer));
1639 if (n->pitr != NULL)
1641 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1646 GNUNET_free (n->skm);
1649 while (NULL != (m = n->messages))
1651 n->messages = m->next;
1654 while (NULL != (m = n->encrypted_head))
1656 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1661 while (NULL != (car = n->active_client_request_head))
1663 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1664 n->active_client_request_tail,
1666 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
1667 &n->peer.hashPubKey,
1673 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1676 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1677 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
1678 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1679 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
1680 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1681 GNUNET_SCHEDULER_cancel (n->quota_update_task);
1682 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1683 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1684 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1685 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
1686 if (n->status == PEER_STATE_KEY_CONFIRMED)
1687 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), -1, GNUNET_NO);
1688 GNUNET_array_grow (n->ats, n->ats_count, 0);
1689 GNUNET_free_non_null (n->public_key);
1690 GNUNET_free_non_null (n->pending_ping);
1691 GNUNET_free_non_null (n->pending_pong);
1697 * Check if we have encrypted messages for the specified neighbour
1698 * pending, and if so, check with the transport about sending them
1701 * @param n neighbour to check.
1703 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1707 * Encrypt size bytes from in and write the result to out. Use the
1708 * key for outbound traffic of the given neighbour.
1710 * @param n neighbour we are sending to
1711 * @param iv initialization vector to use
1712 * @param in ciphertext
1713 * @param out plaintext
1714 * @param size size of in/out
1715 * @return GNUNET_OK on success
1718 do_encrypt (struct Neighbour *n,
1719 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1720 const void *in, void *out, size_t size)
1722 if (size != (uint16_t) size)
1727 GNUNET_assert (size ==
1728 GNUNET_CRYPTO_aes_encrypt (in,
1732 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1734 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1735 "Encrypted %u bytes for `%4s' using key %u, IV %u\n",
1736 (unsigned int) size,
1737 GNUNET_i2s (&n->peer),
1738 (unsigned int) n->encrypt_key.crc32,
1739 GNUNET_CRYPTO_crc32_n (iv, sizeof(iv)));
1746 * Consider freeing the given neighbour since we may not need
1747 * to keep it around anymore.
1749 * @param n neighbour to consider discarding
1752 consider_free_neighbour (struct Neighbour *n);
1756 * Task triggered when a neighbour entry is about to time out
1757 * (and we should prevent this by sending a PING).
1759 * @param cls the 'struct Neighbour'
1760 * @param tc scheduler context (not used)
1763 send_keep_alive (void *cls,
1764 const struct GNUNET_SCHEDULER_TaskContext *tc)
1766 struct Neighbour *n = cls;
1767 struct GNUNET_TIME_Relative retry;
1768 struct GNUNET_TIME_Relative left;
1769 struct MessageEntry *me;
1770 struct PingMessage pp;
1771 struct PingMessage *pm;
1772 struct GNUNET_CRYPTO_AesInitializationVector iv;
1774 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1776 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1777 sizeof (struct PingMessage));
1778 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1779 me->priority = PING_PRIORITY;
1780 me->size = sizeof (struct PingMessage);
1781 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1785 pm = (struct PingMessage *) &me[1];
1786 pm->header.size = htons (sizeof (struct PingMessage));
1787 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1788 pm->iv_seed = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1790 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
1791 pp.challenge = n->ping_challenge;
1792 pp.target = n->peer;
1794 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1795 "Encrypting `%s' message with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
1797 (unsigned int) n->ping_challenge,
1798 GNUNET_i2s (&n->peer),
1799 (unsigned int) n->encrypt_key.crc32,
1800 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
1807 sizeof (struct PingMessage) -
1808 ((void *) &pm->target - (void *) pm));
1809 process_encrypted_neighbour_queue (n);
1810 /* reschedule PING job */
1811 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1812 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1813 MIN_PING_FREQUENCY);
1815 = GNUNET_SCHEDULER_add_delayed (retry,
1823 * Task triggered when a neighbour entry might have gotten stale.
1825 * @param cls the 'struct Neighbour'
1826 * @param tc scheduler context (not used)
1829 consider_free_task (void *cls,
1830 const struct GNUNET_SCHEDULER_TaskContext *tc)
1832 struct Neighbour *n = cls;
1834 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1835 consider_free_neighbour (n);
1840 * Consider freeing the given neighbour since we may not need
1841 * to keep it around anymore.
1843 * @param n neighbour to consider discarding
1846 consider_free_neighbour (struct Neighbour *n)
1848 struct GNUNET_TIME_Relative left;
1850 if ( (n->th != NULL) ||
1851 (n->pitr != NULL) ||
1852 (GNUNET_YES == n->is_connected) )
1853 return; /* no chance */
1855 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1856 if (left.rel_value > 0)
1858 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1859 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1860 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (left,
1861 &consider_free_task,
1865 /* actually free the neighbour... */
1866 GNUNET_assert (GNUNET_OK ==
1867 GNUNET_CONTAINER_multihashmap_remove (neighbours,
1868 &n->peer.hashPubKey,
1870 GNUNET_STATISTICS_set (stats,
1871 gettext_noop ("# neighbour entries allocated"),
1872 GNUNET_CONTAINER_multihashmap_size (neighbours),
1879 * Function called when the transport service is ready to
1880 * receive an encrypted message for the respective peer
1882 * @param cls neighbour to use message from
1883 * @param size number of bytes we can transmit
1884 * @param buf where to copy the message
1885 * @return number of bytes transmitted
1888 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1890 struct Neighbour *n = cls;
1891 struct MessageEntry *m;
1896 m = n->encrypted_head;
1900 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1901 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1902 GNUNET_i2s (&n->peer));
1906 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1913 GNUNET_assert (size >= m->size);
1914 memcpy (cbuf, &m[1], m->size);
1916 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1919 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1920 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1921 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1923 GNUNET_i2s (&n->peer));
1925 process_encrypted_neighbour_queue (n);
1930 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1931 "Transmission of message of type %u and size %u failed\n",
1932 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1933 (unsigned int) m->size);
1937 consider_free_neighbour (n);
1943 * Check if we have plaintext messages for the specified neighbour
1944 * pending, and if so, consider batching and encrypting them (and
1945 * then trigger processing of the encrypted queue if needed).
1947 * @param n neighbour to check.
1949 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1953 * Check if we have encrypted messages for the specified neighbour
1954 * pending, and if so, check with the transport about sending them
1957 * @param n neighbour to check.
1960 process_encrypted_neighbour_queue (struct Neighbour *n)
1962 struct MessageEntry *m;
1965 return; /* request already pending */
1966 m = n->encrypted_head;
1969 /* encrypted queue empty, try plaintext instead */
1970 process_plaintext_neighbour_queue (n);
1974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1975 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1976 (unsigned int) m->size,
1977 GNUNET_i2s (&n->peer),
1978 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
1981 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1984 GNUNET_TIME_absolute_get_remaining
1986 ¬ify_encrypted_transmit_ready,
1990 /* message request too large or duplicate request */
1992 /* discard encrypted message */
1993 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1997 process_encrypted_neighbour_queue (n);
2003 * Decrypt size bytes from in and write the result to out. Use the
2004 * key for inbound traffic of the given neighbour. This function does
2005 * NOT do any integrity-checks on the result.
2007 * @param n neighbour we are receiving from
2008 * @param iv initialization vector to use
2009 * @param in ciphertext
2010 * @param out plaintext
2011 * @param size size of in/out
2012 * @return GNUNET_OK on success
2015 do_decrypt (struct Neighbour *n,
2016 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
2017 const void *in, void *out, size_t size)
2019 if (size != (uint16_t) size)
2024 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
2025 (n->status != PEER_STATE_KEY_CONFIRMED))
2027 GNUNET_break_op (0);
2028 return GNUNET_SYSERR;
2031 GNUNET_CRYPTO_aes_decrypt (in,
2038 return GNUNET_SYSERR;
2040 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes decrypted"), size, GNUNET_NO);
2042 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2043 "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
2044 (unsigned int) size,
2045 GNUNET_i2s (&n->peer),
2046 (unsigned int) n->decrypt_key.crc32,
2047 GNUNET_CRYPTO_crc32_n (iv, sizeof(*iv)));
2054 * Select messages for transmission. This heuristic uses a combination
2055 * of earliest deadline first (EDF) scheduling (with bounded horizon)
2056 * and priority-based discard (in case no feasible schedule exist) and
2057 * speculative optimization (defer any kind of transmission until
2058 * we either create a batch of significant size, 25% of max, or until
2059 * we are close to a deadline). Furthermore, when scheduling the
2060 * heuristic also packs as many messages into the batch as possible,
2061 * starting with those with the earliest deadline. Yes, this is fun.
2063 * @param n neighbour to select messages from
2064 * @param size number of bytes to select for transmission
2065 * @param retry_time set to the time when we should try again
2066 * (only valid if this function returns zero)
2067 * @return number of bytes selected, or 0 if we decided to
2068 * defer scheduling overall; in that case, retry_time is set.
2071 select_messages (struct Neighbour *n,
2072 size_t size, struct GNUNET_TIME_Relative *retry_time)
2074 struct MessageEntry *pos;
2075 struct MessageEntry *min;
2076 struct MessageEntry *last;
2077 unsigned int min_prio;
2078 struct GNUNET_TIME_Absolute t;
2079 struct GNUNET_TIME_Absolute now;
2080 struct GNUNET_TIME_Relative delta;
2082 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
2085 unsigned int queue_size;
2086 int discard_low_prio;
2088 GNUNET_assert (NULL != n->messages);
2089 now = GNUNET_TIME_absolute_get ();
2090 /* last entry in linked list of messages processed */
2092 /* should we remove the entry with the lowest
2093 priority from consideration for scheduling at the
2104 discard_low_prio = GNUNET_YES;
2105 while (GNUNET_YES == discard_low_prio)
2108 min_prio = UINT_MAX;
2109 discard_low_prio = GNUNET_NO;
2110 /* calculate number of bytes available for transmission at time "t" */
2111 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
2113 /* how many bytes have we (hypothetically) scheduled so far */
2115 /* maximum time we can wait before transmitting anything
2116 and still make all of our deadlines */
2117 slack = GNUNET_TIME_UNIT_FOREVER_REL;
2119 /* note that we use "*2" here because we want to look
2120 a bit further into the future; much more makes no
2121 sense since new message might be scheduled in the
2123 while ((pos != NULL) && (off < size * 2))
2125 if (pos->do_transmit == GNUNET_YES)
2127 /* already removed from consideration */
2131 if (discard_low_prio == GNUNET_NO)
2133 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
2134 if (delta.rel_value > 0)
2136 // FIXME: HUH? Check!
2138 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
2141 if (avail < pos->size)
2143 // FIXME: HUH? Check!
2144 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
2149 /* update slack, considering both its absolute deadline
2150 and relative deadlines caused by other messages
2151 with their respective load */
2152 slack = GNUNET_TIME_relative_min (slack,
2153 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
2155 if (pos->deadline.abs_value <= now.abs_value)
2158 slack = GNUNET_TIME_UNIT_ZERO;
2160 else if (GNUNET_YES == pos->got_slack)
2162 /* should be soon now! */
2163 slack = GNUNET_TIME_relative_min (slack,
2164 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
2169 GNUNET_TIME_relative_min (slack,
2170 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
2171 pos->got_slack = GNUNET_YES;
2172 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
2173 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
2178 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
2179 if (pos->priority <= min_prio)
2181 /* update min for discard */
2182 min_prio = pos->priority;
2187 if (discard_low_prio)
2189 GNUNET_assert (min != NULL);
2190 /* remove lowest-priority entry from consideration */
2191 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
2195 /* guard against sending "tiny" messages with large headers without
2197 if ( (slack.rel_value > GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value) &&
2199 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
2201 /* less than 25% of message would be filled with deadlines still
2202 being met if we delay by one second or more; so just wait for
2203 more data; but do not wait longer than 1s (since we don't want
2204 to delay messages for a really long time either). */
2205 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
2206 /* reset do_transmit values for next time */
2209 pos->do_transmit = GNUNET_NO;
2212 GNUNET_STATISTICS_update (stats,
2213 gettext_noop ("# transmissions delayed due to corking"),
2216 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2217 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
2218 (unsigned long long) retry_time->rel_value,
2220 (unsigned int) size);
2224 /* select marked messages (up to size) for transmission */
2229 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
2231 pos->do_transmit = GNUNET_YES; /* mark for transmission */
2235 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2236 "Selecting message of size %u for transmission\n",
2237 (unsigned int) pos->size);
2243 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2244 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
2245 (unsigned int) pos->size,
2248 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
2253 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2254 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
2255 (unsigned long long) off, (unsigned long long) tsize,
2256 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
2257 GNUNET_i2s (&n->peer));
2264 * Batch multiple messages into a larger buffer.
2266 * @param n neighbour to take messages from
2267 * @param buf target buffer
2268 * @param size size of buf
2269 * @param deadline set to transmission deadline for the result
2270 * @param retry_time set to the time when we should try again
2271 * (only valid if this function returns zero)
2272 * @param priority set to the priority of the batch
2273 * @return number of bytes written to buf (can be zero)
2276 batch_message (struct Neighbour *n,
2279 struct GNUNET_TIME_Absolute *deadline,
2280 struct GNUNET_TIME_Relative *retry_time,
2281 unsigned int *priority)
2283 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
2284 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
2285 struct MessageEntry *pos;
2286 struct MessageEntry *prev;
2287 struct MessageEntry *next;
2292 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2293 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
2294 if (0 == select_messages (n, size, retry_time))
2297 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2298 "No messages selected, will try again in %llu ms\n",
2299 retry_time->rel_value);
2303 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
2304 ntm->ats_count = htonl (0);
2305 ntm->ats.type = htonl (0);
2306 ntm->ats.value = htonl (0);
2307 ntm->peer = n->peer;
2310 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
2313 if (GNUNET_YES == pos->do_transmit)
2315 GNUNET_assert (pos->size <= size);
2316 /* do notifications */
2317 /* FIXME: track if we have *any* client that wants
2318 full notifications and only do this if that is
2320 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
2322 memcpy (&ntm[1], &pos[1], pos->size);
2323 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2324 sizeof (struct GNUNET_MessageHeader));
2325 send_to_all_clients (&ntm->header,
2327 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
2331 /* message too large for 'full' notifications, we do at
2332 least the 'hdr' type */
2335 sizeof (struct GNUNET_MessageHeader));
2337 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2339 send_to_all_clients (&ntm->header,
2341 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
2343 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2344 "Encrypting %u bytes with message of type %u and size %u\n",
2346 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
2347 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
2349 /* copy for encrypted transmission */
2350 memcpy (&buf[ret], &pos[1], pos->size);
2353 *priority += pos->priority;
2355 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2356 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
2357 (unsigned int) pos->size,
2358 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).rel_value);
2360 deadline->abs_value = GNUNET_MIN (deadline->abs_value, pos->deadline.abs_value);
2374 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2375 "Deadline for message batch is %llu ms\n",
2376 GNUNET_TIME_absolute_get_remaining (*deadline).rel_value);
2383 * Remove messages with deadlines that have long expired from
2386 * @param n neighbour to inspect
2389 discard_expired_messages (struct Neighbour *n)
2391 struct MessageEntry *prev;
2392 struct MessageEntry *next;
2393 struct MessageEntry *pos;
2394 struct GNUNET_TIME_Absolute now;
2395 struct GNUNET_TIME_Relative delta;
2399 now = GNUNET_TIME_absolute_get ();
2405 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
2406 if (delta.rel_value > PAST_EXPIRATION_DISCARD_TIME.rel_value)
2409 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2410 "Message is %llu ms past due, discarding.\n",
2417 GNUNET_STATISTICS_update (stats,
2418 gettext_noop ("# messages discarded (expired prior to transmission)"),
2428 if (GNUNET_YES == disc)
2429 schedule_peer_messages (n);
2434 * Signature of the main function of a task.
2436 * @param cls closure
2437 * @param tc context information (why was this task triggered now)
2440 retry_plaintext_processing (void *cls,
2441 const struct GNUNET_SCHEDULER_TaskContext *tc)
2443 struct Neighbour *n = cls;
2445 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2446 process_plaintext_neighbour_queue (n);
2451 * Send our key (and encrypted PING) to the other peer.
2453 * @param n the other peer
2455 static void send_key (struct Neighbour *n);
2458 * Task that will retry "send_key" if our previous attempt failed
2462 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2464 struct Neighbour *n = cls;
2467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2468 "Retrying key transmission to `%4s'\n",
2469 GNUNET_i2s (&n->peer));
2471 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2472 n->set_key_retry_frequency =
2473 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
2479 * Check if we have plaintext messages for the specified neighbour
2480 * pending, and if so, consider batching and encrypting them (and
2481 * then trigger processing of the encrypted queue if needed).
2483 * @param n neighbour to check.
2486 process_plaintext_neighbour_queue (struct Neighbour *n)
2488 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
2490 struct EncryptedMessage *em; /* encrypted message */
2491 struct EncryptedMessage *ph; /* plaintext header */
2492 struct MessageEntry *me;
2493 unsigned int priority;
2494 struct GNUNET_TIME_Absolute deadline;
2495 struct GNUNET_TIME_Relative retry_time;
2496 struct GNUNET_CRYPTO_AesInitializationVector iv;
2497 struct GNUNET_CRYPTO_AuthKey auth_key;
2499 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
2501 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
2502 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2506 case PEER_STATE_DOWN:
2509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2510 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2511 GNUNET_i2s(&n->peer));
2514 case PEER_STATE_KEY_SENT:
2515 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2516 n->retry_set_key_task
2517 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2518 &set_key_retry_task, n);
2520 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2521 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2522 GNUNET_i2s(&n->peer));
2525 case PEER_STATE_KEY_RECEIVED:
2526 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2527 n->retry_set_key_task
2528 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2529 &set_key_retry_task, n);
2531 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2532 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2533 GNUNET_i2s(&n->peer));
2536 case PEER_STATE_KEY_CONFIRMED:
2537 /* ready to continue */
2540 discard_expired_messages (n);
2541 if (n->messages == NULL)
2544 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2545 "Plaintext message queue for `%4s' is empty.\n",
2546 GNUNET_i2s(&n->peer));
2548 return; /* no pending messages */
2550 if (n->encrypted_head != NULL)
2553 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2554 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2555 GNUNET_i2s(&n->peer));
2557 return; /* wait for messages already encrypted to be
2560 ph = (struct EncryptedMessage *) pbuf;
2561 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2563 used = sizeof (struct EncryptedMessage);
2564 used += batch_message (n,
2566 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2567 &deadline, &retry_time, &priority);
2568 if (used == sizeof (struct EncryptedMessage))
2571 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2572 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2573 GNUNET_i2s(&n->peer));
2575 /* no messages selected for sending, try again later... */
2576 n->retry_plaintext_task =
2577 GNUNET_SCHEDULER_add_delayed (retry_time,
2578 &retry_plaintext_processing, n);
2581 #if DEBUG_CORE_QUOTA
2582 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2583 "Sending %u b/s as new limit to peer `%4s'\n",
2584 (unsigned int) ntohl (n->bw_in.value__),
2585 GNUNET_i2s (&n->peer));
2587 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
2588 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2589 ph->inbound_bw_limit = n->bw_in;
2590 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2592 /* setup encryption message header */
2593 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2594 me->deadline = deadline;
2595 me->priority = priority;
2597 em = (struct EncryptedMessage *) &me[1];
2598 em->header.size = htons (used);
2599 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2600 em->iv_seed = ph->iv_seed;
2601 derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
2604 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2605 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2606 (unsigned int) used - ENCRYPTED_HEADER_SIZE,
2607 GNUNET_i2s(&n->peer),
2608 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).rel_value);
2610 GNUNET_assert (GNUNET_OK ==
2613 &ph->sequence_number,
2614 &em->sequence_number, used - ENCRYPTED_HEADER_SIZE));
2615 derive_auth_key (&auth_key,
2618 n->encrypt_key_created);
2619 GNUNET_CRYPTO_hmac (&auth_key,
2620 &em->sequence_number,
2621 used - ENCRYPTED_HEADER_SIZE,
2624 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2625 "Authenticated %u bytes of ciphertext %u: `%s'\n",
2626 used - ENCRYPTED_HEADER_SIZE,
2627 GNUNET_CRYPTO_crc32_n (&em->sequence_number,
2628 used - ENCRYPTED_HEADER_SIZE),
2629 GNUNET_h2s (&em->hmac));
2631 /* append to transmission list */
2632 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2636 process_encrypted_neighbour_queue (n);
2637 schedule_peer_messages (n);
2642 * Function that recalculates the bandwidth quota for the
2643 * given neighbour and transmits it to the transport service.
2645 * @param cls neighbour for the quota update
2649 neighbour_quota_update (void *cls,
2650 const struct GNUNET_SCHEDULER_TaskContext *tc);
2654 * Schedule the task that will recalculate the bandwidth
2655 * quota for this peer (and possibly force a disconnect of
2656 * idle peers by calculating a bandwidth of zero).
2659 schedule_quota_update (struct Neighbour *n)
2661 GNUNET_assert (n->quota_update_task ==
2662 GNUNET_SCHEDULER_NO_TASK);
2663 n->quota_update_task
2664 = GNUNET_SCHEDULER_add_delayed (QUOTA_UPDATE_FREQUENCY,
2665 &neighbour_quota_update,
2671 * Initialize a new 'struct Neighbour'.
2673 * @param pid ID of the new neighbour
2674 * @return handle for the new neighbour
2676 static struct Neighbour *
2677 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2679 struct Neighbour *n;
2680 struct GNUNET_TIME_Absolute now;
2683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2684 "Creating neighbour entry for peer `%4s'\n",
2687 n = GNUNET_malloc (sizeof (struct Neighbour));
2689 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2690 now = GNUNET_TIME_absolute_get ();
2691 n->encrypt_key_created = now;
2692 n->last_activity = now;
2693 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2694 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2695 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2696 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2697 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2698 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
2700 GNUNET_assert (GNUNET_OK ==
2701 GNUNET_CONTAINER_multihashmap_put (neighbours,
2702 &n->peer.hashPubKey,
2704 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2705 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
2706 GNUNET_CONTAINER_multihashmap_size (neighbours), GNUNET_NO);
2707 neighbour_quota_update (n, NULL);
2708 consider_free_neighbour (n);
2714 * Handle CORE_SEND request.
2717 * @param client the client issuing the request
2718 * @param message the "struct SendMessage"
2721 handle_client_send (void *cls,
2722 struct GNUNET_SERVER_Client *client,
2723 const struct GNUNET_MessageHeader *message)
2725 const struct SendMessage *sm;
2726 struct Neighbour *n;
2727 struct MessageEntry *prev;
2728 struct MessageEntry *pos;
2729 struct MessageEntry *e;
2730 struct MessageEntry *min_prio_entry;
2731 struct MessageEntry *min_prio_prev;
2732 unsigned int min_prio;
2733 unsigned int queue_size;
2736 msize = ntohs (message->size);
2738 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2740 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));
2743 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2746 sm = (const struct SendMessage *) message;
2747 msize -= sizeof (struct SendMessage);
2748 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2751 GNUNET_SERVER_mst_receive (mst,
2753 (const char*) &sm[1],
2758 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2761 n = find_neighbour (&sm->peer);
2763 n = create_neighbour (&sm->peer);
2765 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2766 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2768 (unsigned int) msize,
2769 GNUNET_i2s (&sm->peer));
2771 discard_expired_messages (n);
2772 /* bound queue size */
2773 /* NOTE: this entire block to bound the queue size should be
2774 obsolete with the new client-request code and the
2775 'schedule_peer_messages' mechanism; we still have this code in
2776 here for now as a sanity check for the new mechanmism;
2777 ultimately, we should probably simply reject SEND messages that
2778 are not 'approved' (or provide a new core API for very unreliable
2779 delivery that always sends with priority 0). Food for thought. */
2780 min_prio = UINT32_MAX;
2781 min_prio_entry = NULL;
2782 min_prio_prev = NULL;
2788 if (pos->priority <= min_prio)
2790 min_prio_entry = pos;
2791 min_prio_prev = prev;
2792 min_prio = pos->priority;
2798 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2801 if (ntohl(sm->priority) <= min_prio)
2803 /* discard new entry; this should no longer happen! */
2806 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2807 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2809 (unsigned int) MAX_PEER_QUEUE_SIZE,
2810 (unsigned int) msize,
2811 (unsigned int) ntohs (message->type));
2813 GNUNET_STATISTICS_update (stats,
2814 gettext_noop ("# discarded CORE_SEND requests"),
2818 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2821 GNUNET_assert (min_prio_entry != NULL);
2822 /* discard "min_prio_entry" */
2824 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2825 "Queue full, discarding existing older request\n");
2827 GNUNET_STATISTICS_update (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 1, GNUNET_NO);
2828 if (min_prio_prev == NULL)
2829 n->messages = min_prio_entry->next;
2831 min_prio_prev->next = min_prio_entry->next;
2832 GNUNET_free (min_prio_entry);
2836 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2837 "Adding transmission request for `%4s' of size %u to queue\n",
2838 GNUNET_i2s (&sm->peer),
2839 (unsigned int) msize);
2841 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2842 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2843 e->priority = ntohl (sm->priority);
2845 memcpy (&e[1], &sm[1], msize);
2847 /* insert, keep list sorted by deadline */
2850 while ((pos != NULL) && (pos->deadline.abs_value < e->deadline.abs_value))
2861 /* consider scheduling now */
2862 process_plaintext_neighbour_queue (n);
2864 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2869 * Function called when the transport service is ready to
2870 * receive a message. Only resets 'n->th' to NULL.
2872 * @param cls neighbour to use message from
2873 * @param size number of bytes we can transmit
2874 * @param buf where to copy the message
2875 * @return number of bytes transmitted
2878 notify_transport_connect_done (void *cls, size_t size, void *buf)
2880 struct Neighbour *n = cls;
2883 if (GNUNET_YES != n->is_connected)
2885 /* transport should only call us to transmit a message after
2886 * telling us about a successful connection to the respective peer */
2888 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Timeout on notify connect!\n");
2894 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2895 _("Failed to connect to `%4s': transport failed to connect\n"),
2896 GNUNET_i2s (&n->peer));
2899 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2900 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2901 GNUNET_i2s (&n->peer));
2902 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2903 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2904 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (&set_key_retry_task,
2911 * Handle CORE_REQUEST_CONNECT request.
2914 * @param client the client issuing the request
2915 * @param message the "struct ConnectMessage"
2918 handle_client_request_connect (void *cls,
2919 struct GNUNET_SERVER_Client *client,
2920 const struct GNUNET_MessageHeader *message)
2922 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2923 struct Neighbour *n;
2924 struct GNUNET_TIME_Relative timeout;
2926 if (0 == memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2929 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2932 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2933 n = find_neighbour (&cm->peer);
2935 n = create_neighbour (&cm->peer);
2936 if ( (GNUNET_YES == n->is_connected) ||
2939 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2940 "Core received `%s' request for `%4s', already connected!\n",
2942 GNUNET_i2s (&cm->peer));
2943 return; /* already connected, or at least trying */
2945 GNUNET_STATISTICS_update (stats, gettext_noop ("# connection requests received"), 1, GNUNET_NO);
2947 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2948 "Core received `%s' request for `%4s', will try to establish connection\n",
2950 GNUNET_i2s (&cm->peer));
2952 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2953 /* ask transport to connect to the peer */
2954 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2956 sizeof (struct GNUNET_MessageHeader), 0,
2958 ¬ify_transport_connect_done,
2960 GNUNET_break (NULL != n->th);
2965 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2966 * the neighbour's struct and retry send_key. Or, if we did not get a
2967 * HELLO, just do nothing.
2969 * @param cls the 'struct Neighbour' to retry sending the key for
2970 * @param peer the peer for which this is the HELLO
2971 * @param hello HELLO message of that peer
2974 process_hello_retry_send_key (void *cls,
2975 const struct GNUNET_PeerIdentity *peer,
2976 const struct GNUNET_HELLO_Message *hello)
2978 struct Neighbour *n = cls;
2983 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2984 "Entered `%s' and `%s' is NULL!\n",
2985 "process_hello_retry_send_key",
2989 if (n->public_key != NULL)
2991 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2993 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2994 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2996 GNUNET_STATISTICS_update (stats,
2997 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3006 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
3007 GNUNET_i2s (&n->peer));
3009 GNUNET_STATISTICS_update (stats,
3010 gettext_noop ("# Delayed connecting due to lack of public key"),
3013 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
3014 n->retry_set_key_task
3015 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3016 &set_key_retry_task, n);
3022 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3023 "Entered `%s' for peer `%4s'\n",
3024 "process_hello_retry_send_key",
3027 if (n->public_key != NULL)
3029 /* already have public key, why are we here? */
3035 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3036 "Received new `%s' message for `%4s', initiating key exchange.\n",
3041 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3042 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3044 GNUNET_STATISTICS_update (stats,
3045 gettext_noop ("# Error extracting public key from HELLO"),
3048 GNUNET_free (n->public_key);
3049 n->public_key = NULL;
3051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3052 "GNUNET_HELLO_get_key returned awfully\n");
3060 * Send our key (and encrypted PING) to the other peer.
3062 * @param n the other peer
3065 send_key (struct Neighbour *n)
3067 struct MessageEntry *pos;
3068 struct SetKeyMessage *sm;
3069 struct MessageEntry *me;
3070 struct PingMessage pp;
3071 struct PingMessage *pm;
3072 struct GNUNET_CRYPTO_AesInitializationVector iv;
3074 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3076 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3077 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3079 if (n->pitr != NULL)
3082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3083 "Key exchange in progress with `%4s'.\n",
3084 GNUNET_i2s (&n->peer));
3086 return; /* already in progress */
3088 if (GNUNET_YES != n->is_connected)
3091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3092 "Not yet connected to peer `%4s'!\n",
3093 GNUNET_i2s (&n->peer));
3097 GNUNET_STATISTICS_update (stats,
3098 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
3101 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3103 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
3105 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3106 ¬ify_encrypted_transmit_ready,
3112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3113 "Asked to perform key exchange with `%4s'.\n",
3114 GNUNET_i2s (&n->peer));
3116 if (n->public_key == NULL)
3118 /* lookup n's public key, then try again */
3120 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3121 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
3122 GNUNET_i2s (&n->peer));
3124 GNUNET_assert (n->pitr == NULL);
3125 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3127 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
3128 &process_hello_retry_send_key, n);
3131 pos = n->encrypted_head;
3134 if (GNUNET_YES == pos->is_setkey)
3136 if (pos->sender_status == n->status)
3139 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3140 "`%s' message for `%4s' queued already\n",
3142 GNUNET_i2s (&n->peer));
3144 goto trigger_processing;
3146 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
3151 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3152 "Removing queued `%s' message for `%4s', will create a new one\n",
3154 GNUNET_i2s (&n->peer));
3164 case PEER_STATE_DOWN:
3165 n->status = PEER_STATE_KEY_SENT;
3167 case PEER_STATE_KEY_SENT:
3169 case PEER_STATE_KEY_RECEIVED:
3171 case PEER_STATE_KEY_CONFIRMED:
3179 /* first, set key message */
3180 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3181 sizeof (struct SetKeyMessage) +
3182 sizeof (struct PingMessage));
3183 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
3184 me->priority = SET_KEY_PRIORITY;
3185 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
3186 me->is_setkey = GNUNET_YES;
3187 me->got_slack = GNUNET_YES; /* do not defer this one! */
3188 me->sender_status = n->status;
3189 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3193 sm = (struct SetKeyMessage *) &me[1];
3194 sm->header.size = htons (sizeof (struct SetKeyMessage));
3195 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
3196 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
3197 PEER_STATE_KEY_SENT : n->status));
3199 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3200 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3201 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3202 sizeof (struct GNUNET_PeerIdentity));
3203 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
3204 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
3205 sm->target = n->peer;
3206 GNUNET_assert (GNUNET_OK ==
3207 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
3209 GNUNET_CRYPTO_AesSessionKey),
3211 &sm->encrypted_key));
3212 GNUNET_assert (GNUNET_OK ==
3213 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
3215 pm = (struct PingMessage *) &sm[1];
3216 pm->header.size = htons (sizeof (struct PingMessage));
3217 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
3218 pm->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3219 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
3220 pp.challenge = n->ping_challenge;
3221 pp.target = n->peer;
3223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3224 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
3226 (unsigned int) n->ping_challenge,
3227 GNUNET_i2s (&n->peer),
3228 (unsigned int) n->encrypt_key.crc32,
3229 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3236 sizeof (struct PingMessage) -
3237 ((void *) &pm->target - (void *) pm));
3238 GNUNET_STATISTICS_update (stats,
3239 gettext_noop ("# SET_KEY and PING messages created"),
3243 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3244 "Have %llu ms left for `%s' transmission.\n",
3245 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).rel_value,
3249 /* trigger queue processing */
3250 process_encrypted_neighbour_queue (n);
3251 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
3252 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
3253 n->retry_set_key_task
3254 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3255 &set_key_retry_task, n);
3260 * We received a SET_KEY message. Validate and update
3261 * our key material and status.
3263 * @param n the neighbour from which we received message m
3264 * @param m the set key message we received
3265 * @param ats performance data
3266 * @param ats_count number of entries in ats (excluding 0-termination)
3269 handle_set_key (struct Neighbour *n,
3270 const struct SetKeyMessage *m,
3271 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3272 uint32_t ats_count);
3277 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3278 * the neighbour's struct and retry handling the set_key message. Or,
3279 * if we did not get a HELLO, just free the set key message.
3281 * @param cls pointer to the set key message
3282 * @param peer the peer for which this is the HELLO
3283 * @param hello HELLO message of that peer
3286 process_hello_retry_handle_set_key (void *cls,
3287 const struct GNUNET_PeerIdentity *peer,
3288 const struct GNUNET_HELLO_Message *hello)
3290 struct Neighbour *n = cls;
3291 struct SetKeyMessage *sm = n->skm;
3297 if (n->public_key != NULL)
3300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3301 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
3303 GNUNET_i2s (&n->peer),
3306 handle_set_key (n, sm, NULL, 0);
3310 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3311 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
3313 GNUNET_i2s (&n->peer));
3318 if (n->public_key != NULL)
3319 return; /* multiple HELLOs match!? */
3321 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3322 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3324 GNUNET_break_op (0);
3325 GNUNET_free (n->public_key);
3326 n->public_key = NULL;
3332 * Merge the given performance data with the data we currently
3333 * track for the given neighbour.
3335 * @param n neighbour
3336 * @param ats new performance data
3337 * @param ats_count number of records in ats
3340 update_neighbour_performance (struct Neighbour *n,
3341 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3349 for (i = 0; i < ats_count; i++)
3351 for (j=0;j < n->ats_count; j++)
3353 if (n->ats[j].type == ats[i].type)
3355 n->ats[j].value = ats[i].value;
3359 if (j == n->ats_count)
3361 GNUNET_array_append (n->ats,
3370 * We received a PING message. Validate and transmit
3373 * @param n sender of the PING
3374 * @param m the encrypted PING message itself
3375 * @param ats performance data
3376 * @param ats_count number of entries in ats (excluding 0-termination)
3379 handle_ping (struct Neighbour *n,
3380 const struct PingMessage *m,
3381 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3384 struct PingMessage t;
3385 struct PongMessage tx;
3386 struct PongMessage *tp;
3387 struct MessageEntry *me;
3388 struct GNUNET_CRYPTO_AesInitializationVector iv;
3391 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3392 "Core service receives `%s' request from `%4s'.\n",
3393 "PING", GNUNET_i2s (&n->peer));
3395 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3401 sizeof (struct PingMessage) -
3402 ((void *) &m->target - (void *) m)))
3405 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3406 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
3408 GNUNET_i2s (&t.target),
3409 (unsigned int) t.challenge,
3410 (unsigned int) n->decrypt_key.crc32,
3411 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3414 GNUNET_STATISTICS_update (stats,
3415 gettext_noop ("# PING messages decrypted"),
3418 if (0 != memcmp (&t.target,
3419 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3421 GNUNET_break_op (0);
3424 update_neighbour_performance (n, ats, ats_count);
3425 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3426 sizeof (struct PongMessage));
3427 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3431 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
3432 me->priority = PONG_PRIORITY;
3433 me->size = sizeof (struct PongMessage);
3434 tx.inbound_bw_limit = n->bw_in;
3435 tx.challenge = t.challenge;
3436 tx.target = t.target;
3437 tp = (struct PongMessage *) &me[1];
3438 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
3439 tp->header.size = htons (sizeof (struct PongMessage));
3440 tp->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3441 derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
3446 sizeof (struct PongMessage) -
3447 ((void *) &tp->challenge - (void *) tp));
3448 GNUNET_STATISTICS_update (stats,
3449 gettext_noop ("# PONG messages created"),
3453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3454 "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
3456 (unsigned int) t.challenge,
3457 (unsigned int) n->encrypt_key.crc32,
3458 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3461 /* trigger queue processing */
3462 process_encrypted_neighbour_queue (n);
3467 * We received a PONG message. Validate and update our status.
3469 * @param n sender of the PONG
3470 * @param m the encrypted PONG message itself
3471 * @param ats performance data
3472 * @param ats_count number of entries in ats (excluding 0-termination)
3475 handle_pong (struct Neighbour *n,
3476 const struct PongMessage *m,
3477 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3480 struct PongMessage t;
3481 struct ConnectNotifyMessage *cnm;
3482 struct GNUNET_CRYPTO_AesInitializationVector iv;
3483 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
3484 struct GNUNET_TRANSPORT_ATS_Information *mats;
3488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3489 "Core service receives `%s' response from `%4s'.\n",
3490 "PONG", GNUNET_i2s (&n->peer));
3492 /* mark as garbage, just to be sure */
3493 memset (&t, 255, sizeof (t));
3494 derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
3501 sizeof (struct PongMessage) -
3502 ((void *) &m->challenge - (void *) m)))
3504 GNUNET_break_op (0);
3507 GNUNET_STATISTICS_update (stats,
3508 gettext_noop ("# PONG messages decrypted"),
3512 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3513 "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
3515 GNUNET_i2s (&t.target),
3516 (unsigned int) t.challenge,
3517 (unsigned int) n->decrypt_key.crc32,
3518 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3521 if ((0 != memcmp (&t.target,
3523 sizeof (struct GNUNET_PeerIdentity))) ||
3524 (n->ping_challenge != t.challenge))
3526 /* PONG malformed */
3528 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3529 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
3531 GNUNET_i2s (&n->peer),
3532 (unsigned int) n->ping_challenge);
3533 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3534 "Received malformed `%s' received from `%4s' with challenge %u\n",
3535 "PONG", GNUNET_i2s (&t.target),
3536 (unsigned int) t.challenge);
3538 GNUNET_break_op (n->ping_challenge != t.challenge);
3543 case PEER_STATE_DOWN:
3544 GNUNET_break (0); /* should be impossible */
3546 case PEER_STATE_KEY_SENT:
3547 GNUNET_break (0); /* should be impossible, how did we decrypt? */
3549 case PEER_STATE_KEY_RECEIVED:
3550 GNUNET_STATISTICS_update (stats,
3551 gettext_noop ("# Session keys confirmed via PONG"),
3554 n->status = PEER_STATE_KEY_CONFIRMED;
3555 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
3557 n->bw_out_external_limit = t.inbound_bw_limit;
3558 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3559 n->bw_out_internal_limit);
3560 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3562 GNUNET_TRANSPORT_set_quota (transport,
3566 GNUNET_TIME_UNIT_FOREVER_REL,
3570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3571 "Confirmed key via `%s' message for peer `%4s'\n",
3572 "PONG", GNUNET_i2s (&n->peer));
3574 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3576 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3577 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3579 update_neighbour_performance (n, ats, ats_count);
3580 size = sizeof (struct ConnectNotifyMessage) +
3581 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3582 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3585 /* recovery strategy: throw away performance data */
3586 GNUNET_array_grow (n->ats,
3589 size = sizeof (struct PeerStatusNotifyMessage) +
3590 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3592 cnm = (struct ConnectNotifyMessage*) buf;
3593 cnm->header.size = htons (size);
3594 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
3595 cnm->ats_count = htonl (n->ats_count);
3596 cnm->peer = n->peer;
3600 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
3601 mats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3602 mats[n->ats_count].value = htonl (0);
3603 send_to_all_clients (&cnm->header,
3605 GNUNET_CORE_OPTION_SEND_CONNECT);
3606 process_encrypted_neighbour_queue (n);
3608 case PEER_STATE_KEY_CONFIRMED:
3609 n->last_activity = GNUNET_TIME_absolute_get ();
3610 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3611 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3613 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3616 handle_peer_status_change (n);
3626 * We received a SET_KEY message. Validate and update
3627 * our key material and status.
3629 * @param n the neighbour from which we received message m
3630 * @param m the set key message we received
3631 * @param ats performance data
3632 * @param ats_count number of entries in ats (excluding 0-termination)
3635 handle_set_key (struct Neighbour *n,
3636 const struct SetKeyMessage *m,
3637 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3640 struct SetKeyMessage *m_cpy;
3641 struct GNUNET_TIME_Absolute t;
3642 struct GNUNET_CRYPTO_AesSessionKey k;
3643 struct PingMessage *ping;
3644 struct PongMessage *pong;
3645 enum PeerStateMachine sender_status;
3648 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3649 "Core service receives `%s' request from `%4s'.\n",
3650 "SET_KEY", GNUNET_i2s (&n->peer));
3652 if (n->public_key == NULL)
3654 if (n->pitr != NULL)
3657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3658 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3665 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3667 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3668 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3669 /* lookup n's public key, then try again */
3670 GNUNET_assert (n->skm == NULL);
3672 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3674 GNUNET_TIME_UNIT_MINUTES,
3675 &process_hello_retry_handle_set_key, n);
3676 GNUNET_STATISTICS_update (stats,
3677 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3682 if (0 != memcmp (&m->target,
3684 sizeof (struct GNUNET_PeerIdentity)))
3686 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3687 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3689 GNUNET_i2s (&m->target));
3692 if ((ntohl (m->purpose.size) !=
3693 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3694 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3695 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3696 sizeof (struct GNUNET_PeerIdentity)) ||
3698 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3699 &m->purpose, &m->signature, n->public_key)))
3701 /* invalid signature */
3702 GNUNET_break_op (0);
3705 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3706 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3707 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3708 (t.abs_value < n->decrypt_key_created.abs_value))
3710 /* this could rarely happen due to massive re-ordering of
3711 messages on the network level, but is most likely either
3712 a bug or some adversary messing with us. Report. */
3713 GNUNET_break_op (0);
3717 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3718 "Decrypting key material.\n");
3720 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3723 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3724 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3725 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3727 /* failed to decrypt !? */
3728 GNUNET_break_op (0);
3731 GNUNET_STATISTICS_update (stats,
3732 gettext_noop ("# SET_KEY messages decrypted"),
3736 if (n->decrypt_key_created.abs_value != t.abs_value)
3738 /* fresh key, reset sequence numbers */
3739 n->last_sequence_number_received = 0;
3740 n->last_packets_bitmap = 0;
3741 n->decrypt_key_created = t;
3743 update_neighbour_performance (n, ats, ats_count);
3744 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3747 case PEER_STATE_DOWN:
3748 n->status = PEER_STATE_KEY_RECEIVED;
3750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3751 "Responding to `%s' with my own key.\n", "SET_KEY");
3755 case PEER_STATE_KEY_SENT:
3756 case PEER_STATE_KEY_RECEIVED:
3757 n->status = PEER_STATE_KEY_RECEIVED;
3758 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3759 (sender_status != PEER_STATE_KEY_CONFIRMED))
3762 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3763 "Responding to `%s' with my own key (other peer has status %u).\n",
3765 (unsigned int) sender_status);
3770 case PEER_STATE_KEY_CONFIRMED:
3771 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3772 (sender_status != PEER_STATE_KEY_CONFIRMED))
3775 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3776 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3778 (unsigned int) sender_status);
3787 if (n->pending_ping != NULL)
3789 ping = n->pending_ping;
3790 n->pending_ping = NULL;
3791 handle_ping (n, ping, NULL, 0);
3794 if (n->pending_pong != NULL)
3796 pong = n->pending_pong;
3797 n->pending_pong = NULL;
3798 handle_pong (n, pong, NULL, 0);
3805 * Send a P2P message to a client.
3807 * @param sender who sent us the message?
3808 * @param client who should we give the message to?
3809 * @param m contains the message to transmit
3810 * @param msize number of bytes in buf to transmit
3813 send_p2p_message_to_client (struct Neighbour *sender,
3814 struct Client *client,
3815 const void *m, size_t msize)
3817 size_t size = msize + sizeof (struct NotifyTrafficMessage) +
3818 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3820 struct NotifyTrafficMessage *ntm;
3821 struct GNUNET_TRANSPORT_ATS_Information *ats;
3823 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3826 /* recovery strategy: throw performance data away... */
3827 GNUNET_array_grow (sender->ats,
3830 size = msize + sizeof (struct NotifyTrafficMessage) +
3831 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3834 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3835 "Core service passes message from `%4s' of type %u to client.\n",
3836 GNUNET_i2s(&sender->peer),
3837 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3839 ntm = (struct NotifyTrafficMessage *) buf;
3840 ntm->header.size = htons (size);
3841 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3842 ntm->ats_count = htonl (sender->ats_count);
3843 ntm->peer = sender->peer;
3847 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * sender->ats_count);
3848 ats[sender->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3849 ats[sender->ats_count].value = htonl (0);
3850 memcpy (&ats[sender->ats_count+1],
3853 send_to_client (client, &ntm->header, GNUNET_YES);
3858 * Deliver P2P message to interested clients.
3860 * @param cls always NULL
3861 * @param client who sent us the message (struct Neighbour)
3862 * @param m the message
3865 deliver_message (void *cls,
3867 const struct GNUNET_MessageHeader *m)
3869 struct Neighbour *sender = client;
3870 size_t msize = ntohs (m->size);
3872 struct Client *cpos;
3878 type = ntohs (m->type);
3880 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3881 "Received encapsulated message of type %u and size %u from `%4s'\n",
3882 (unsigned int) type,
3884 GNUNET_i2s (&sender->peer));
3886 GNUNET_snprintf (buf,
3888 gettext_noop ("# bytes of messages of type %u received"),
3889 (unsigned int) type);
3890 GNUNET_STATISTICS_set (stats,
3894 dropped = GNUNET_YES;
3896 while (cpos != NULL)
3898 deliver_full = GNUNET_NO;
3899 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
3900 deliver_full = GNUNET_YES;
3903 for (tpos = 0; tpos < cpos->tcnt; tpos++)
3905 if (type != cpos->types[tpos])
3907 deliver_full = GNUNET_YES;
3911 if (GNUNET_YES == deliver_full)
3913 send_p2p_message_to_client (sender, cpos, m, msize);
3914 dropped = GNUNET_NO;
3916 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
3918 send_p2p_message_to_client (sender, cpos, m,
3919 sizeof (struct GNUNET_MessageHeader));
3923 if (dropped == GNUNET_YES)
3926 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3927 "Message of type %u from `%4s' not delivered to any client.\n",
3928 (unsigned int) type,
3929 GNUNET_i2s (&sender->peer));
3931 GNUNET_STATISTICS_update (stats,
3932 gettext_noop ("# messages not delivered to any client"),
3939 * We received an encrypted message. Decrypt, validate and
3940 * pass on to the appropriate clients.
3942 * @param n target of the message
3943 * @param m encrypted message
3944 * @param ats performance data
3945 * @param ats_count number of entries in ats (excluding 0-termination)
3948 handle_encrypted_message (struct Neighbour *n,
3949 const struct EncryptedMessage *m,
3950 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3953 size_t size = ntohs (m->header.size);
3955 struct EncryptedMessage *pt; /* plaintext */
3958 struct GNUNET_TIME_Absolute t;
3959 struct GNUNET_CRYPTO_AesInitializationVector iv;
3960 struct GNUNET_CRYPTO_AuthKey auth_key;
3963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3964 "Core service receives `%s' request from `%4s'.\n",
3965 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
3968 derive_auth_key (&auth_key,
3971 n->decrypt_key_created);
3972 GNUNET_CRYPTO_hmac (&auth_key,
3973 &m->sequence_number,
3974 size - ENCRYPTED_HEADER_SIZE, &ph);
3976 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3977 "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
3978 (unsigned int) size - ENCRYPTED_HEADER_SIZE,
3979 GNUNET_CRYPTO_crc32_n (&m->sequence_number,
3980 size - ENCRYPTED_HEADER_SIZE),
3984 if (0 != memcmp (&ph,
3986 sizeof (GNUNET_HashCode)))
3988 /* checksum failed */
3989 GNUNET_break_op (0);
3992 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3997 &m->sequence_number,
3998 &buf[ENCRYPTED_HEADER_SIZE],
3999 size - ENCRYPTED_HEADER_SIZE))
4001 pt = (struct EncryptedMessage *) buf;
4003 /* validate sequence number */
4004 snum = ntohl (pt->sequence_number);
4005 if (n->last_sequence_number_received == snum)
4007 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4008 "Received duplicate message, ignoring.\n");
4009 /* duplicate, ignore */
4010 GNUNET_STATISTICS_set (stats,
4011 gettext_noop ("# bytes dropped (duplicates)"),
4016 if ((n->last_sequence_number_received > snum) &&
4017 (n->last_sequence_number_received - snum > 32))
4019 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4020 "Received ancient out of sequence message, ignoring.\n");
4021 /* ancient out of sequence, ignore */
4022 GNUNET_STATISTICS_set (stats,
4023 gettext_noop ("# bytes dropped (out of sequence)"),
4028 if (n->last_sequence_number_received > snum)
4030 unsigned int rotbit =
4031 1 << (n->last_sequence_number_received - snum - 1);
4032 if ((n->last_packets_bitmap & rotbit) != 0)
4034 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4035 "Received duplicate message, ignoring.\n");
4036 GNUNET_STATISTICS_set (stats,
4037 gettext_noop ("# bytes dropped (duplicates)"),
4040 /* duplicate, ignore */
4043 n->last_packets_bitmap |= rotbit;
4045 if (n->last_sequence_number_received < snum)
4047 int shift = (snum - n->last_sequence_number_received);
4048 if (shift >= 8 * sizeof(n->last_packets_bitmap))
4049 n->last_packets_bitmap = 0;
4051 n->last_packets_bitmap <<= shift;
4052 n->last_sequence_number_received = snum;
4055 /* check timestamp */
4056 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
4057 if (GNUNET_TIME_absolute_get_duration (t).rel_value > MAX_MESSAGE_AGE.rel_value)
4059 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4061 ("Message received far too old (%llu ms). Content ignored.\n"),
4062 GNUNET_TIME_absolute_get_duration (t).rel_value);
4063 GNUNET_STATISTICS_set (stats,
4064 gettext_noop ("# bytes dropped (ancient message)"),
4070 /* process decrypted message(s) */
4071 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
4073 #if DEBUG_CORE_SET_QUOTA
4074 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4075 "Received %u b/s as new inbound limit for peer `%4s'\n",
4076 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
4077 GNUNET_i2s (&n->peer));
4079 n->bw_out_external_limit = pt->inbound_bw_limit;
4080 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
4081 n->bw_out_internal_limit);
4082 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
4084 GNUNET_TRANSPORT_set_quota (transport,
4088 GNUNET_TIME_UNIT_FOREVER_REL,
4091 n->last_activity = GNUNET_TIME_absolute_get ();
4092 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4093 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4095 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4098 GNUNET_STATISTICS_set (stats,
4099 gettext_noop ("# bytes of payload decrypted"),
4100 size - sizeof (struct EncryptedMessage),
4102 handle_peer_status_change (n);
4103 update_neighbour_performance (n, ats, ats_count);
4104 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
4106 &buf[sizeof (struct EncryptedMessage)],
4107 size - sizeof (struct EncryptedMessage),
4108 GNUNET_YES, GNUNET_NO))
4109 GNUNET_break_op (0);
4114 * Function called by the transport for each received message.
4116 * @param cls closure
4117 * @param peer (claimed) identity of the other peer
4118 * @param message the message
4119 * @param ats performance data
4120 * @param ats_count number of entries in ats (excluding 0-termination)
4123 handle_transport_receive (void *cls,
4124 const struct GNUNET_PeerIdentity *peer,
4125 const struct GNUNET_MessageHeader *message,
4126 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4129 struct Neighbour *n;
4130 struct GNUNET_TIME_Absolute now;
4137 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4138 "Received message of type %u from `%4s', demultiplexing.\n",
4139 (unsigned int) ntohs (message->type),
4142 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4147 n = find_neighbour (peer);
4149 n = create_neighbour (peer);
4150 changed = GNUNET_YES; /* FIXME... */
4151 up = (n->status == PEER_STATE_KEY_CONFIRMED);
4152 type = ntohs (message->type);
4153 size = ntohs (message->size);
4156 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
4157 if (size != sizeof (struct SetKeyMessage))
4159 GNUNET_break_op (0);
4162 GNUNET_STATISTICS_update (stats, gettext_noop ("# session keys received"), 1, GNUNET_NO);
4164 (const struct SetKeyMessage *) message,
4167 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
4168 if (size < sizeof (struct EncryptedMessage) +
4169 sizeof (struct GNUNET_MessageHeader))
4171 GNUNET_break_op (0);
4174 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4175 (n->status != PEER_STATE_KEY_CONFIRMED))
4177 GNUNET_break_op (0);
4180 handle_encrypted_message (n,
4181 (const struct EncryptedMessage *) message,
4184 case GNUNET_MESSAGE_TYPE_CORE_PING:
4185 if (size != sizeof (struct PingMessage))
4187 GNUNET_break_op (0);
4190 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
4191 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4192 (n->status != PEER_STATE_KEY_CONFIRMED))
4195 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4196 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4197 "PING", GNUNET_i2s (&n->peer));
4199 GNUNET_free_non_null (n->pending_ping);
4200 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
4201 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
4204 handle_ping (n, (const struct PingMessage *) message,
4207 case GNUNET_MESSAGE_TYPE_CORE_PONG:
4208 if (size != sizeof (struct PongMessage))
4210 GNUNET_break_op (0);
4213 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
4214 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
4215 (n->status != PEER_STATE_KEY_CONFIRMED) )
4218 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4219 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4220 "PONG", GNUNET_i2s (&n->peer));
4222 GNUNET_free_non_null (n->pending_pong);
4223 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
4224 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
4227 handle_pong (n, (const struct PongMessage *) message,
4231 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4232 _("Unsupported message of type %u received.\n"),
4233 (unsigned int) type);
4236 if (n->status == PEER_STATE_KEY_CONFIRMED)
4238 now = GNUNET_TIME_absolute_get ();
4239 n->last_activity = now;
4240 changed = GNUNET_YES;
4243 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), 1, GNUNET_NO);
4244 n->time_established = now;
4246 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4247 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4249 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4254 handle_peer_status_change (n);
4259 * Function that recalculates the bandwidth quota for the
4260 * given neighbour and transmits it to the transport service.
4262 * @param cls neighbour for the quota update
4266 neighbour_quota_update (void *cls,
4267 const struct GNUNET_SCHEDULER_TaskContext *tc)
4269 struct Neighbour *n = cls;
4270 struct GNUNET_BANDWIDTH_Value32NBO q_in;
4271 struct GNUNET_BANDWIDTH_Value32NBO q_out;
4272 struct GNUNET_BANDWIDTH_Value32NBO q_out_min;
4275 unsigned long long distributable;
4276 uint64_t need_per_peer;
4277 uint64_t need_per_second;
4278 unsigned int neighbour_count;
4281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4282 "Neighbour quota update calculation running for peer `%4s'\n",
4283 GNUNET_i2s (&n->peer));
4285 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
4286 /* calculate relative preference among all neighbours;
4287 divides by a bit more to avoid division by zero AND to
4288 account for possibility of new neighbours joining any time
4289 AND to convert to double... */
4290 neighbour_count = GNUNET_CONTAINER_multihashmap_size (neighbours);
4291 if (neighbour_count == 0)
4293 if (preference_sum == 0)
4295 pref_rel = 1.0 / (double) neighbour_count;
4299 pref_rel = n->current_preference / preference_sum;
4301 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
4302 GNUNET_TIME_UNIT_SECONDS);
4303 need_per_second = need_per_peer * neighbour_count;
4305 /* calculate inbound bandwidth per peer */
4307 if (bandwidth_target_in_bps > need_per_second)
4308 distributable = bandwidth_target_in_bps - need_per_second;
4309 share = distributable * pref_rel;
4310 if (share + need_per_peer > UINT32_MAX)
4311 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4313 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4315 /* calculate outbound bandwidth per peer */
4317 if (bandwidth_target_out_bps > need_per_second)
4318 distributable = bandwidth_target_out_bps - need_per_second;
4319 share = distributable * pref_rel;
4320 if (share + need_per_peer > UINT32_MAX)
4321 q_out = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4323 q_out = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4324 n->bw_out_internal_limit = q_out;
4326 q_out_min = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit, n->bw_out_internal_limit);
4327 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window, n->bw_out);
4329 /* check if we want to disconnect for good due to inactivity */
4330 if ( (GNUNET_TIME_absolute_get_duration (get_neighbour_timeout (n)).rel_value > 0) &&
4331 (GNUNET_TIME_absolute_get_duration (n->time_established).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) )
4334 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4335 "Forcing disconnect of `%4s' due to inactivity\n",
4336 GNUNET_i2s (&n->peer));
4338 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
4340 #if DEBUG_CORE_QUOTA
4341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4342 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
4343 GNUNET_i2s (&n->peer),
4344 (unsigned int) ntohl (q_in.value__),
4345 bandwidth_target_out_bps,
4346 (unsigned int) ntohl (n->bw_in.value__),
4347 (unsigned int) ntohl (n->bw_out.value__),
4348 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
4350 if ((n->bw_in.value__ != q_in.value__) || (n->bw_out.value__ != q_out_min.value__))
4352 if (n->bw_in.value__ != q_in.value__)
4354 if (n->bw_out.value__ != q_out_min.value__)
4355 n->bw_out = q_out_min;
4356 if (GNUNET_YES == n->is_connected)
4357 GNUNET_TRANSPORT_set_quota (transport,
4361 GNUNET_TIME_UNIT_FOREVER_REL,
4363 handle_peer_status_change (n);
4365 schedule_quota_update (n);
4370 * Function called by transport to notify us that
4371 * a peer connected to us (on the network level).
4373 * @param cls closure
4374 * @param peer the peer that connected
4375 * @param ats performance data
4376 * @param ats_count number of entries in ats (excluding 0-termination)
4379 handle_transport_notify_connect (void *cls,
4380 const struct GNUNET_PeerIdentity *peer,
4381 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4384 struct Neighbour *n;
4386 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4391 n = find_neighbour (peer);
4394 if (GNUNET_YES == n->is_connected)
4396 /* duplicate connect notification!? */
4403 n = create_neighbour (peer);
4405 GNUNET_STATISTICS_update (stats,
4406 gettext_noop ("# peers connected (transport)"),
4409 n->is_connected = GNUNET_YES;
4410 update_neighbour_performance (n, ats, ats_count);
4411 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
4414 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
4418 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4419 "Received connection from `%4s'.\n",
4420 GNUNET_i2s (&n->peer));
4422 GNUNET_TRANSPORT_set_quota (transport,
4426 GNUNET_TIME_UNIT_FOREVER_REL,
4433 * Function called by transport telling us that a peer
4436 * @param cls closure
4437 * @param peer the peer that disconnected
4440 handle_transport_notify_disconnect (void *cls,
4441 const struct GNUNET_PeerIdentity *peer)
4443 struct DisconnectNotifyMessage cnm;
4444 struct Neighbour *n;
4445 struct ClientActiveRequest *car;
4446 struct GNUNET_TIME_Relative left;
4449 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4450 "Peer `%4s' disconnected from us; received notification from transport.\n", GNUNET_i2s (peer));
4453 n = find_neighbour (peer);
4459 GNUNET_break (n->is_connected);
4460 if (n->status == PEER_STATE_KEY_CONFIRMED)
4462 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
4463 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
4465 send_to_all_clients (&cnm.header, GNUNET_NO, GNUNET_CORE_OPTION_SEND_DISCONNECT);
4468 /* On transport disconnect transport doesn't cancel requests, so must do so here. */
4471 GNUNET_TRANSPORT_notify_transmit_ready_cancel(n->th);
4475 n->is_connected = GNUNET_NO;
4476 n->status = PEER_STATE_DOWN;
4477 while (NULL != (car = n->active_client_request_head))
4479 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
4480 n->active_client_request_tail,
4482 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
4483 &n->peer.hashPubKey,
4488 GNUNET_STATISTICS_update (stats,
4489 gettext_noop ("# peers connected (transport)"),
4492 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
4493 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
4494 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4495 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
4496 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
4498 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
4499 &consider_free_task,
4505 * Wrapper around 'free_neighbour'; helper for 'cleaning_task'.
4508 free_neighbour_helper (void *cls,
4509 const GNUNET_HashCode *key,
4512 struct Neighbour *n = value;
4520 * Last task run during shutdown. Disconnects us from
4524 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4529 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4530 "Core service shutting down.\n");
4532 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
4533 &free_neighbour_helper,
4535 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
4537 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), 0, GNUNET_NO);
4538 GNUNET_assert (transport != NULL);
4539 GNUNET_TRANSPORT_disconnect (transport);
4541 GNUNET_SERVER_notification_context_destroy (notifier);
4543 while (NULL != (c = clients))
4544 handle_client_disconnect (NULL, c->client_handle);
4545 if (my_private_key != NULL)
4546 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4548 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4549 if (peerinfo != NULL)
4550 GNUNET_PEERINFO_disconnect (peerinfo);
4552 GNUNET_SERVER_mst_destroy (mst);
4557 * Initiate core service.
4559 * @param cls closure
4560 * @param server the initialized server
4561 * @param c configuration to use
4565 struct GNUNET_SERVER_Handle *server,
4566 const struct GNUNET_CONFIGURATION_Handle *c)
4568 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4569 {&handle_client_init, NULL,
4570 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
4571 {&handle_client_iterate_peers, NULL,
4572 GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS,
4573 sizeof (struct GNUNET_MessageHeader)},
4574 {&handle_client_request_info, NULL,
4575 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
4576 sizeof (struct RequestInfoMessage)},
4577 {&handle_client_send_request, NULL,
4578 GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST,
4579 sizeof (struct SendMessageRequest)},
4580 {&handle_client_send, NULL,
4581 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
4582 {&handle_client_request_connect, NULL,
4583 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
4584 sizeof (struct ConnectMessage)},
4590 /* parse configuration */
4593 GNUNET_CONFIGURATION_get_value_number (c,
4596 &bandwidth_target_in_bps)) ||
4598 GNUNET_CONFIGURATION_get_value_number (c,
4601 &bandwidth_target_out_bps)) ||
4603 GNUNET_CONFIGURATION_get_value_filename (c,
4605 "HOSTKEY", &keyfile)))
4607 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4609 ("Core service is lacking key configuration settings. Exiting.\n"));
4610 GNUNET_SCHEDULER_shutdown ();
4613 peerinfo = GNUNET_PEERINFO_connect (cfg);
4614 if (NULL == peerinfo)
4616 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4617 _("Could not access PEERINFO service. Exiting.\n"));
4618 GNUNET_SCHEDULER_shutdown ();
4619 GNUNET_free (keyfile);
4622 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4623 GNUNET_free (keyfile);
4624 if (my_private_key == NULL)
4626 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4627 _("Core service could not access hostkey. Exiting.\n"));
4628 GNUNET_PEERINFO_disconnect (peerinfo);
4629 GNUNET_SCHEDULER_shutdown ();
4632 neighbours = GNUNET_CONTAINER_multihashmap_create (128);
4633 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4634 GNUNET_CRYPTO_hash (&my_public_key,
4635 sizeof (my_public_key), &my_identity.hashPubKey);
4636 self.public_key = &my_public_key;
4637 self.last_activity = GNUNET_TIME_UNIT_FOREVER_ABS;
4638 self.status = PEER_STATE_KEY_CONFIRMED;
4639 self.is_connected = GNUNET_YES;
4640 /* setup notification */
4641 notifier = GNUNET_SERVER_notification_context_create (server,
4643 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
4644 /* setup transport connection */
4645 transport = GNUNET_TRANSPORT_connect (cfg,
4648 &handle_transport_receive,
4649 &handle_transport_notify_connect,
4650 &handle_transport_notify_disconnect);
4651 GNUNET_assert (NULL != transport);
4652 stats = GNUNET_STATISTICS_create ("core", cfg);
4654 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded CORE_SEND requests"), 0, GNUNET_NO);
4655 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 0, GNUNET_NO);
4657 mst = GNUNET_SERVER_mst_create (&deliver_message,
4659 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
4660 &cleaning_task, NULL);
4661 /* process client requests */
4662 GNUNET_SERVER_add_handlers (server, handlers);
4663 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4664 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
4670 * The main function for the transport service.
4672 * @param argc number of arguments from the command line
4673 * @param argv command line arguments
4674 * @return 0 ok, 1 on error
4677 main (int argc, char *const *argv)
4679 return (GNUNET_OK ==
4680 GNUNET_SERVICE_run (argc,
4683 GNUNET_SERVICE_OPTION_NONE,
4684 &run, NULL)) ? 0 : 1;
4687 /* end of gnunet-service-core.c */