2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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13 General Public License for more details.
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22 * @file core/gnunet-service-core.c
23 * @brief high-level P2P messaging
24 * @author Christian Grothoff
26 * Considerations for later:
27 * - check that hostkey used by transport (for HELLOs) is the
28 * same as the hostkey that we are using!
29 * - add code to send PINGs if we are about to time-out otherwise
30 * - optimize lookup (many O(n) list traversals
31 * could ideally be changed to O(1) hash map lookups)
34 #include "gnunet_constants.h"
35 #include "gnunet_util_lib.h"
36 #include "gnunet_hello_lib.h"
37 #include "gnunet_peerinfo_service.h"
38 #include "gnunet_protocols.h"
39 #include "gnunet_signatures.h"
40 #include "gnunet_statistics_service.h"
41 #include "gnunet_transport_service.h"
45 #define DEBUG_HANDSHAKE GNUNET_NO
47 #define DEBUG_CORE_QUOTA GNUNET_NO
50 * Receive and send buffer windows grow over time. For
51 * how long can 'unused' bandwidth accumulate before we
52 * need to cap it? (specified in seconds).
54 #define MAX_WINDOW_TIME_S (5 * 60)
57 * How many messages do we queue up at most for optional
58 * notifications to a client? (this can cause notifications
59 * about outgoing messages to be dropped).
61 #define MAX_NOTIFY_QUEUE 1024
64 * Minimum bandwidth (out) to assign to any connected peer.
65 * Should be rather low; values larger than DEFAULT_BW_IN_OUT make no
68 #define MIN_BANDWIDTH_PER_PEER GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT
71 * After how much time past the "official" expiration time do
72 * we discard messages? Should not be zero since we may
73 * intentionally defer transmission until close to the deadline
74 * and then may be slightly past the deadline due to inaccuracy
75 * in sleep and our own CPU consumption.
77 #define PAST_EXPIRATION_DISCARD_TIME GNUNET_TIME_UNIT_SECONDS
80 * What is the maximum delay for a SET_KEY message?
82 #define MAX_SET_KEY_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
85 * How long do we wait for SET_KEY confirmation initially?
87 #define INITIAL_SET_KEY_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 1)
90 * What is the maximum delay for a PING message?
92 #define MAX_PING_DELAY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 2)
95 * What is the maximum delay for a PONG message?
97 #define MAX_PONG_DELAY GNUNET_TIME_relative_multiply (MAX_PING_DELAY, 2)
100 * What is the minimum frequency for a PING message?
102 #define MIN_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
105 * How often do we recalculate bandwidth quotas?
107 #define QUOTA_UPDATE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
110 * What is the priority for a SET_KEY message?
112 #define SET_KEY_PRIORITY 0xFFFFFF
115 * What is the priority for a PING message?
117 #define PING_PRIORITY 0xFFFFFF
120 * What is the priority for a PONG message?
122 #define PONG_PRIORITY 0xFFFFFF
125 * How many messages do we queue per peer at most? Must be at
128 #define MAX_PEER_QUEUE_SIZE 16
131 * How many non-mandatory messages do we queue per client at most?
133 #define MAX_CLIENT_QUEUE_SIZE 32
136 * What is the maximum age of a message for us to consider
137 * processing it? Note that this looks at the timestamp used
138 * by the other peer, so clock skew between machines does
139 * come into play here. So this should be picked high enough
140 * so that a little bit of clock skew does not prevent peers
141 * from connecting to us.
143 #define MAX_MESSAGE_AGE GNUNET_TIME_UNIT_DAYS
147 * State machine for our P2P encryption handshake. Everyone starts in
148 * "DOWN", if we receive the other peer's key (other peer initiated)
149 * we start in state RECEIVED (since we will immediately send our
150 * own); otherwise we start in SENT. If we get back a PONG from
151 * within either state, we move up to CONFIRMED (the PONG will always
152 * be sent back encrypted with the key we sent to the other peer).
154 enum PeerStateMachine
162 * We've sent our session key.
167 * We've received the other peers session key.
169 PEER_STATE_KEY_RECEIVED,
172 * The other peer has confirmed our session key with a message
173 * encrypted with his session key (which we got). Session is now fully up.
175 PEER_STATE_KEY_CONFIRMED
180 * Encapsulation for encrypted messages exchanged between
181 * peers. Followed by the actual encrypted data.
183 struct EncryptedMessage
186 * Message type is either CORE_ENCRYPTED_MESSAGE.
188 struct GNUNET_MessageHeader header;
191 * Random value used for IV generation.
193 uint32_t iv_seed GNUNET_PACKED;
196 * MAC of the encrypted message (starting at 'sequence_number'),
197 * used to verify message integrity. Everything after this value
198 * (excluding this value itself) will be encrypted and authenticated.
199 * ENCRYPTED_HEADER_SIZE must be set to the offset of the *next* field.
201 GNUNET_HashCode hmac;
204 * Sequence number, in network byte order. This field
205 * must be the first encrypted/decrypted field
207 uint32_t sequence_number GNUNET_PACKED;
210 * Desired bandwidth (how much we should send to this peer / how
211 * much is the sender willing to receive)?
213 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
216 * Timestamp. Used to prevent reply of ancient messages
217 * (recent messages are caught with the sequence number).
219 struct GNUNET_TIME_AbsoluteNBO timestamp;
225 * Number of bytes (at the beginning) of "struct EncryptedMessage"
226 * that are NOT encrypted.
228 #define ENCRYPTED_HEADER_SIZE (offsetof(struct EncryptedMessage, sequence_number))
232 * We're sending an (encrypted) PING to the other peer to check if he
233 * can decrypt. The other peer should respond with a PONG with the
234 * same content, except this time encrypted with the receiver's key.
239 * Message type is CORE_PING.
241 struct GNUNET_MessageHeader header;
246 uint32_t iv_seed GNUNET_PACKED;
249 * Intended target of the PING, used primarily to check
250 * that decryption actually worked.
252 struct GNUNET_PeerIdentity target;
255 * Random number chosen to make reply harder.
257 uint32_t challenge GNUNET_PACKED;
263 * Response to a PING. Includes data from the original PING
264 * plus initial bandwidth quota information.
269 * Message type is CORE_PONG.
271 struct GNUNET_MessageHeader header;
276 uint32_t iv_seed GNUNET_PACKED;
279 * Random number to make faking the reply harder. Must be
280 * first field after header (this is where we start to encrypt!).
282 uint32_t challenge GNUNET_PACKED;
285 * Desired bandwidth (how much we should send to this
286 * peer / how much is the sender willing to receive).
288 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
291 * Intended target of the PING, used primarily to check
292 * that decryption actually worked.
294 struct GNUNET_PeerIdentity target;
299 * Message transmitted to set (or update) a session key.
305 * Message type is either CORE_SET_KEY.
307 struct GNUNET_MessageHeader header;
310 * Status of the sender (should be in "enum PeerStateMachine"), nbo.
312 int32_t sender_status GNUNET_PACKED;
315 * Purpose of the signature, will be
316 * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
318 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
321 * At what time was this key created?
323 struct GNUNET_TIME_AbsoluteNBO creation_time;
326 * The encrypted session key.
328 struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
331 * Who is the intended recipient?
333 struct GNUNET_PeerIdentity target;
336 * Signature of the stuff above (starting at purpose).
338 struct GNUNET_CRYPTO_RsaSignature signature;
344 * Message waiting for transmission. This struct
345 * is followed by the actual content of the message.
351 * We keep messages in a doubly linked list.
353 struct MessageEntry *next;
356 * We keep messages in a doubly linked list.
358 struct MessageEntry *prev;
361 * By when are we supposed to transmit this message?
363 struct GNUNET_TIME_Absolute deadline;
366 * By when are we supposed to transmit this message (after
369 struct GNUNET_TIME_Absolute slack_deadline;
372 * How important is this message to us?
374 unsigned int priority;
377 * If this is a SET_KEY message, what was our connection status when this
378 * message was queued?
380 enum PeerStateMachine sender_status;
383 * Is this a SET_KEY message?
388 * How long is the message? (number of bytes following
389 * the "struct MessageEntry", but not including the
390 * size of "struct MessageEntry" itself!)
395 * Was this message selected for transmission in the
396 * current round? GNUNET_YES or GNUNET_NO.
401 * Did we give this message some slack (delayed sending) previously
402 * (and hence should not give it any more slack)? GNUNET_YES or
411 * Record kept for each request for transmission issued by a
412 * client that is still pending.
414 struct ClientActiveRequest;
417 * Data kept per neighbouring peer.
423 * Unencrypted messages destined for this peer.
425 struct MessageEntry *messages;
428 * Head of the batched, encrypted message queue (already ordered,
429 * transmit starting with the head).
431 struct MessageEntry *encrypted_head;
434 * Tail of the batched, encrypted message queue (already ordered,
435 * append new messages to tail)
437 struct MessageEntry *encrypted_tail;
440 * Head of list of requests from clients for transmission to
443 struct ClientActiveRequest *active_client_request_head;
446 * Tail of list of requests from clients for transmission to
449 struct ClientActiveRequest *active_client_request_tail;
452 * Handle for pending requests for transmission to this peer
453 * with the transport service. NULL if no request is pending.
455 struct GNUNET_TRANSPORT_TransmitHandle *th;
458 * Public key of the neighbour, NULL if we don't have it yet.
460 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
463 * We received a PING message before we got the "public_key"
464 * (or the SET_KEY). We keep it here until we have a key
465 * to decrypt it. NULL if no PING is pending.
467 struct PingMessage *pending_ping;
470 * We received a PONG message before we got the "public_key"
471 * (or the SET_KEY). We keep it here until we have a key
472 * to decrypt it. NULL if no PONG is pending.
474 struct PongMessage *pending_pong;
477 * Non-NULL if we are currently looking up HELLOs for this peer.
480 struct GNUNET_PEERINFO_IteratorContext *pitr;
483 * SetKeyMessage to transmit, NULL if we are not currently trying
486 struct SetKeyMessage *skm;
489 * Performance data for the peer.
491 struct GNUNET_TRANSPORT_ATS_Information *ats;
494 * Identity of the neighbour.
496 struct GNUNET_PeerIdentity peer;
499 * Key we use to encrypt our messages for the other peer
500 * (initialized by us when we do the handshake).
502 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
505 * Key we use to decrypt messages from the other peer
506 * (given to us by the other peer during the handshake).
508 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
511 * ID of task used for re-trying plaintext scheduling.
513 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
516 * ID of task used for re-trying SET_KEY and PING message.
518 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
521 * ID of task used for updating bandwidth quota for this neighbour.
523 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
526 * ID of task used for sending keep-alive pings.
528 GNUNET_SCHEDULER_TaskIdentifier keep_alive_task;
531 * ID of task used for cleaning up dead neighbour entries.
533 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
536 * At what time did we generate our encryption key?
538 struct GNUNET_TIME_Absolute encrypt_key_created;
541 * At what time did the other peer generate the decryption key?
543 struct GNUNET_TIME_Absolute decrypt_key_created;
546 * At what time did we initially establish (as in, complete session
547 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
549 struct GNUNET_TIME_Absolute time_established;
552 * At what time did we last receive an encrypted message from the
553 * other peer? Should be zero if status != KEY_CONFIRMED.
555 struct GNUNET_TIME_Absolute last_activity;
558 * At what frequency are we currently re-trying SET_KEY messages?
560 struct GNUNET_TIME_Relative set_key_retry_frequency;
563 * Tracking bandwidth for sending to this peer.
565 struct GNUNET_BANDWIDTH_Tracker available_send_window;
568 * Tracking bandwidth for receiving from this peer.
570 struct GNUNET_BANDWIDTH_Tracker available_recv_window;
573 * How valueable were the messages of this peer recently?
575 unsigned long long current_preference;
578 * Number of entries in 'ats'.
580 unsigned int ats_count;
583 * Bit map indicating which of the 32 sequence numbers before the last
584 * were received (good for accepting out-of-order packets and
585 * estimating reliability of the connection)
587 unsigned int last_packets_bitmap;
590 * last sequence number received on this connection (highest)
592 uint32_t last_sequence_number_received;
595 * last sequence number transmitted
597 uint32_t last_sequence_number_sent;
600 * Available bandwidth in for this peer (current target).
602 struct GNUNET_BANDWIDTH_Value32NBO bw_in;
605 * Available bandwidth out for this peer (current target).
607 struct GNUNET_BANDWIDTH_Value32NBO bw_out;
610 * Internal bandwidth limit set for this peer (initially typically
611 * set to "-1"). Actual "bw_out" is MIN of
612 * "bpm_out_internal_limit" and "bw_out_external_limit".
614 struct GNUNET_BANDWIDTH_Value32NBO bw_out_internal_limit;
617 * External bandwidth limit set for this peer by the
618 * peer that we are communicating with. "bw_out" is MIN of
619 * "bw_out_internal_limit" and "bw_out_external_limit".
621 struct GNUNET_BANDWIDTH_Value32NBO bw_out_external_limit;
624 * What was our PING challenge number (for this peer)?
626 uint32_t ping_challenge;
629 * What is our connection status?
631 enum PeerStateMachine status;
634 * Are we currently connected to this neighbour?
642 * Data structure for each client connected to the core service.
647 * Clients are kept in a linked list.
652 * Handle for the client with the server API.
654 struct GNUNET_SERVER_Client *client_handle;
657 * Array of the types of messages this peer cares
658 * about (with "tcnt" entries). Allocated as part
659 * of this client struct, do not free!
661 const uint16_t *types;
664 * Map of peer identities to active transmission requests of this
665 * client to the peer (of type 'struct ClientActiveRequest').
667 struct GNUNET_CONTAINER_MultiHashMap *requests;
670 * Options for messages this client cares about,
671 * see GNUNET_CORE_OPTION_ values.
676 * Number of types of incoming messages this client
677 * specifically cares about. Size of the "types" array.
685 * Record kept for each request for transmission issued by a
686 * client that is still pending.
688 struct ClientActiveRequest
692 * Active requests are kept in a doubly-linked list of
693 * the respective target peer.
695 struct ClientActiveRequest *next;
698 * Active requests are kept in a doubly-linked list of
699 * the respective target peer.
701 struct ClientActiveRequest *prev;
704 * Handle to the client.
706 struct Client *client;
709 * By what time would the client want to see this message out?
711 struct GNUNET_TIME_Absolute deadline;
714 * How important is this request.
719 * How many more requests does this client have?
724 * How many bytes does the client intend to send?
729 * Unique request ID (in big endian).
740 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
745 static struct GNUNET_PeerIdentity my_identity;
750 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
754 * Handle to peerinfo service.
756 static struct GNUNET_PEERINFO_Handle *peerinfo;
759 * Our message stream tokenizer (for encrypted payload).
761 static struct GNUNET_SERVER_MessageStreamTokenizer *mst;
766 const struct GNUNET_CONFIGURATION_Handle *cfg;
771 static struct GNUNET_TRANSPORT_Handle *transport;
774 * Linked list of our clients.
776 static struct Client *clients;
779 * Context for notifications we need to send to our clients.
781 static struct GNUNET_SERVER_NotificationContext *notifier;
784 * Map of peer identities to 'struct Neighbour'.
786 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
789 * Neighbour entry for "this" peer.
791 static struct Neighbour self;
794 * For creating statistics.
796 static struct GNUNET_STATISTICS_Handle *stats;
799 * Sum of all preferences among all neighbours.
801 static unsigned long long preference_sum;
804 * How much inbound bandwidth are we supposed to be using per second?
806 static unsigned long long bandwidth_target_in_bps;
809 * How much outbound bandwidth are we supposed to be using per second?
811 static unsigned long long bandwidth_target_out_bps;
814 * Derive an authentication key from "set key" information
817 derive_auth_key (struct GNUNET_CRYPTO_AuthKey *akey,
818 const struct GNUNET_CRYPTO_AesSessionKey *skey,
820 struct GNUNET_TIME_Absolute creation_time)
822 static const char ctx[] = "authentication key";
823 struct GNUNET_TIME_AbsoluteNBO ctbe;
826 ctbe = GNUNET_TIME_absolute_hton (creation_time);
827 GNUNET_CRYPTO_hmac_derive_key (akey,
841 * Derive an IV from packet information
844 derive_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
845 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
846 const struct GNUNET_PeerIdentity *identity)
848 static const char ctx[] = "initialization vector";
850 GNUNET_CRYPTO_aes_derive_iv (iv,
854 &identity->hashPubKey.bits,
855 sizeof(identity->hashPubKey.bits),
861 * Derive an IV from pong packet information
864 derive_pong_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
865 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
866 uint32_t challenge, const struct GNUNET_PeerIdentity *identity)
868 static const char ctx[] = "pong initialization vector";
870 GNUNET_CRYPTO_aes_derive_iv (iv,
874 &identity->hashPubKey.bits,
875 sizeof(identity->hashPubKey.bits),
884 * At what time should the connection to the given neighbour
885 * time out (given no further activity?)
887 * @param n neighbour in question
888 * @return absolute timeout
890 static struct GNUNET_TIME_Absolute
891 get_neighbour_timeout (struct Neighbour *n)
893 return GNUNET_TIME_absolute_add (n->last_activity,
894 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
899 * Helper function for update_preference_sum.
902 update_preference (void *cls,
903 const GNUNET_HashCode *key,
906 unsigned long long *ps = cls;
907 struct Neighbour *n = value;
909 n->current_preference /= 2;
910 *ps += n->current_preference;
916 * A preference value for a neighbour was update. Update
917 * the preference sum accordingly.
919 * @param inc how much was a preference value increased?
922 update_preference_sum (unsigned long long inc)
924 unsigned long long os;
927 preference_sum += inc;
928 if (preference_sum >= os)
930 /* overflow! compensate by cutting all values in half! */
932 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
935 GNUNET_STATISTICS_set (stats, gettext_noop ("# total peer preference"), preference_sum, GNUNET_NO);
940 * Find the entry for the given neighbour.
942 * @param peer identity of the neighbour
943 * @return NULL if we are not connected, otherwise the
946 static struct Neighbour *
947 find_neighbour (const struct GNUNET_PeerIdentity *peer)
949 return GNUNET_CONTAINER_multihashmap_get (neighbours, &peer->hashPubKey);
954 * Send a message to one of our clients.
956 * @param client target for the message
957 * @param msg message to transmit
958 * @param can_drop could this message be dropped if the
959 * client's queue is getting too large?
962 send_to_client (struct Client *client,
963 const struct GNUNET_MessageHeader *msg,
966 #if DEBUG_CORE_CLIENT
967 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
968 "Preparing to send %u bytes of message of type %u to client.\n",
969 (unsigned int) ntohs (msg->size),
970 (unsigned int) ntohs (msg->type));
972 GNUNET_SERVER_notification_context_unicast (notifier,
973 client->client_handle,
980 * Send a message to all of our current clients that have
981 * the right options set.
983 * @param msg message to multicast
984 * @param can_drop can this message be discarded if the queue is too long
985 * @param options mask to use
988 send_to_all_clients (const struct GNUNET_MessageHeader *msg,
997 if (0 != (c->options & options))
999 #if DEBUG_CORE_CLIENT
1000 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1001 "Sending message of type %u to client.\n",
1002 (unsigned int) ntohs (msg->type));
1004 send_to_client (c, msg, can_drop);
1012 * Function called by transport telling us that a peer
1015 * @param n the peer that changed status
1018 handle_peer_status_change (struct Neighbour *n)
1020 struct PeerStatusNotifyMessage *psnm;
1021 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1022 struct GNUNET_TRANSPORT_ATS_Information *ats;
1025 if ( (! n->is_connected) ||
1026 (n->status != PEER_STATE_KEY_CONFIRMED) )
1029 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1030 "Peer `%4s' changed status\n",
1031 GNUNET_i2s (&n->peer));
1033 size = sizeof (struct PeerStatusNotifyMessage) +
1034 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1035 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1038 /* recovery strategy: throw away performance data */
1039 GNUNET_array_grow (n->ats,
1042 size = sizeof (struct PeerStatusNotifyMessage) +
1043 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1045 psnm = (struct PeerStatusNotifyMessage*) buf;
1046 psnm->header.size = htons (size);
1047 psnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE);
1048 psnm->timeout = GNUNET_TIME_absolute_hton (get_neighbour_timeout (n));
1049 psnm->bandwidth_in = n->bw_in;
1050 psnm->bandwidth_out = n->bw_out;
1051 psnm->peer = n->peer;
1052 psnm->ats_count = htonl (n->ats_count);
1056 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
1057 ats[n->ats_count].type = htonl (0);
1058 ats[n->ats_count].value = htonl (0);
1059 send_to_all_clients (&psnm->header,
1061 GNUNET_CORE_OPTION_SEND_STATUS_CHANGE);
1062 GNUNET_STATISTICS_update (stats,
1063 gettext_noop ("# peer status changes"),
1070 * Go over our message queue and if it is not too long, go
1071 * over the pending requests from clients for this
1072 * neighbour and send some clients a 'READY' notification.
1074 * @param n which peer to process
1077 schedule_peer_messages (struct Neighbour *n)
1079 struct SendMessageReady smr;
1080 struct ClientActiveRequest *car;
1081 struct ClientActiveRequest *pos;
1083 struct MessageEntry *mqe;
1084 unsigned int queue_size;
1086 /* check if neighbour queue is empty enough! */
1096 if (queue_size >= MAX_PEER_QUEUE_SIZE)
1098 #if DEBUG_CORE_CLIENT
1099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1100 "Not considering client transmission requests: queue full\n");
1102 return; /* queue still full */
1104 /* find highest priority request */
1105 pos = n->active_client_request_head;
1109 if ( (car == NULL) ||
1110 (pos->priority > car->priority) )
1117 car = n->active_client_request_head;
1120 return; /* no pending requests */
1121 #if DEBUG_CORE_CLIENT
1122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1123 "Permitting client transmission request to `%s'\n",
1124 GNUNET_i2s (&n->peer));
1127 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1128 n->active_client_request_tail,
1130 GNUNET_assert (GNUNET_YES ==
1131 GNUNET_CONTAINER_multihashmap_remove (c->requests,
1132 &n->peer.hashPubKey,
1134 smr.header.size = htons (sizeof (struct SendMessageReady));
1135 smr.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_READY);
1136 smr.size = htons (car->msize);
1137 smr.smr_id = car->smr_id;
1139 send_to_client (c, &smr.header, GNUNET_NO);
1145 * Handle CORE_SEND_REQUEST message.
1148 handle_client_send_request (void *cls,
1149 struct GNUNET_SERVER_Client *client,
1150 const struct GNUNET_MessageHeader *message)
1152 const struct SendMessageRequest *req;
1153 struct Neighbour *n;
1155 struct ClientActiveRequest *car;
1157 req = (const struct SendMessageRequest*) message;
1158 if (0 == memcmp (&req->peer,
1160 sizeof (struct GNUNET_PeerIdentity)))
1163 n = find_neighbour (&req->peer);
1165 (GNUNET_YES != n->is_connected) ||
1166 (n->status != PEER_STATE_KEY_CONFIRMED) )
1168 /* neighbour must have disconnected since request was issued,
1169 ignore (client will realize it once it processes the
1170 disconnect notification) */
1171 #if DEBUG_CORE_CLIENT
1172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1173 "Dropped client request for transmission (am disconnected)\n");
1175 GNUNET_STATISTICS_update (stats,
1176 gettext_noop ("# send requests dropped (disconnected)"),
1179 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1183 while ( (c != NULL) &&
1184 (c->client_handle != client) )
1188 /* client did not send INIT first! */
1190 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1193 if (c->requests == NULL)
1194 c->requests = GNUNET_CONTAINER_multihashmap_create (16);
1195 #if DEBUG_CORE_CLIENT
1196 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1197 "Received client transmission request. queueing\n");
1199 car = GNUNET_CONTAINER_multihashmap_get (c->requests,
1200 &req->peer.hashPubKey);
1203 /* create new entry */
1204 car = GNUNET_malloc (sizeof (struct ClientActiveRequest));
1205 GNUNET_assert (GNUNET_OK ==
1206 GNUNET_CONTAINER_multihashmap_put (c->requests,
1207 &req->peer.hashPubKey,
1209 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
1210 GNUNET_CONTAINER_DLL_insert (n->active_client_request_head,
1211 n->active_client_request_tail,
1215 car->deadline = GNUNET_TIME_absolute_ntoh (req->deadline);
1216 car->priority = ntohl (req->priority);
1217 car->queue_size = ntohl (req->queue_size);
1218 car->msize = ntohs (req->size);
1219 car->smr_id = req->smr_id;
1220 schedule_peer_messages (n);
1221 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1226 * Notify client about an existing connection to one of our neighbours.
1229 notify_client_about_neighbour (void *cls,
1230 const GNUNET_HashCode *key,
1233 struct Client *c = cls;
1234 struct Neighbour *n = value;
1236 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1237 struct GNUNET_TRANSPORT_ATS_Information *ats;
1238 struct ConnectNotifyMessage *cnm;
1240 size = sizeof (struct ConnectNotifyMessage) +
1241 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1242 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1245 /* recovery strategy: throw away performance data */
1246 GNUNET_array_grow (n->ats,
1249 size = sizeof (struct ConnectNotifyMessage) +
1250 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1252 cnm = (struct ConnectNotifyMessage*) buf;
1253 cnm->header.size = htons (size);
1254 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1255 cnm->ats_count = htonl (n->ats_count);
1259 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * n->ats_count);
1260 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1261 ats[n->ats_count].value = htonl (0);
1262 if (n->status == PEER_STATE_KEY_CONFIRMED)
1264 #if DEBUG_CORE_CLIENT
1265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1266 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
1268 cnm->peer = n->peer;
1269 send_to_client (c, &cnm->header, GNUNET_NO);
1277 * Handle CORE_INIT request.
1280 handle_client_init (void *cls,
1281 struct GNUNET_SERVER_Client *client,
1282 const struct GNUNET_MessageHeader *message)
1284 const struct InitMessage *im;
1285 struct InitReplyMessage irm;
1288 const uint16_t *types;
1292 #if DEBUG_CORE_CLIENT
1293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1294 "Client connecting to core service with `%s' message\n",
1297 /* check that we don't have an entry already */
1301 if (client == c->client_handle)
1304 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1309 msize = ntohs (message->size);
1310 if (msize < sizeof (struct InitMessage))
1313 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1316 GNUNET_SERVER_notification_context_add (notifier, client);
1317 im = (const struct InitMessage *) message;
1318 types = (const uint16_t *) &im[1];
1319 msize -= sizeof (struct InitMessage);
1320 c = GNUNET_malloc (sizeof (struct Client) + msize);
1321 c->client_handle = client;
1324 c->tcnt = msize / sizeof (uint16_t);
1325 c->types = (const uint16_t *) &c[1];
1326 wtypes = (uint16_t *) &c[1];
1327 for (i=0;i<c->tcnt;i++)
1328 wtypes[i] = ntohs (types[i]);
1329 c->options = ntohl (im->options);
1330 #if DEBUG_CORE_CLIENT
1331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1332 "Client %p is interested in %u message types\n",
1334 (unsigned int) c->tcnt);
1336 /* send init reply message */
1337 irm.header.size = htons (sizeof (struct InitReplyMessage));
1338 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
1339 irm.reserved = htonl (0);
1340 memcpy (&irm.publicKey,
1342 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1343 #if DEBUG_CORE_CLIENT
1344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1345 "Sending `%s' message to client.\n", "INIT_REPLY");
1347 send_to_client (c, &irm.header, GNUNET_NO);
1348 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
1350 /* notify new client about existing neighbours */
1351 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
1352 ¬ify_client_about_neighbour,
1355 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1360 * Free client request records.
1363 * @param key identity of peer for which this is an active request
1364 * @param value the 'struct ClientActiveRequest' to free
1365 * @return GNUNET_YES (continue iteration)
1368 destroy_active_client_request (void *cls,
1369 const GNUNET_HashCode *key,
1372 struct ClientActiveRequest *car = value;
1373 struct Neighbour *n;
1374 struct GNUNET_PeerIdentity peer;
1376 peer.hashPubKey = *key;
1377 n = find_neighbour (&peer);
1378 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1379 n->active_client_request_tail,
1387 * A client disconnected, clean up.
1389 * @param cls closure
1390 * @param client identification of the client
1393 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
1396 struct Client *prev;
1400 #if DEBUG_CORE_CLIENT
1401 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1402 "Client %p has disconnected from core service.\n",
1409 if (client == pos->client_handle)
1416 /* client never sent INIT */
1420 clients = pos->next;
1422 prev->next = pos->next;
1423 if (pos->requests != NULL)
1425 GNUNET_CONTAINER_multihashmap_iterate (pos->requests,
1426 &destroy_active_client_request,
1428 GNUNET_CONTAINER_multihashmap_destroy (pos->requests);
1435 * Helper function for handle_client_iterate_peers.
1437 * @param cls the 'struct GNUNET_SERVER_TransmitContext' to queue replies
1438 * @param key identity of the connected peer
1439 * @param value the 'struct Neighbour' for the peer
1440 * @return GNUNET_OK (continue to iterate)
1443 queue_connect_message (void *cls,
1444 const GNUNET_HashCode *key,
1447 struct GNUNET_SERVER_TransmitContext *tc = cls;
1448 struct Neighbour *n = value;
1449 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1450 struct GNUNET_TRANSPORT_ATS_Information *ats;
1452 struct ConnectNotifyMessage *cnm;
1454 cnm = (struct ConnectNotifyMessage*) buf;
1455 if (n->status != PEER_STATE_KEY_CONFIRMED)
1457 size = sizeof (struct ConnectNotifyMessage) +
1458 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1459 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1462 /* recovery strategy: throw away performance data */
1463 GNUNET_array_grow (n->ats,
1466 size = sizeof (struct PeerStatusNotifyMessage) +
1467 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1469 cnm = (struct ConnectNotifyMessage*) buf;
1470 cnm->header.size = htons (size);
1471 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1472 cnm->ats_count = htonl (n->ats_count);
1476 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
1477 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1478 ats[n->ats_count].value = htonl (0);
1479 #if DEBUG_CORE_CLIENT
1480 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1481 "Sending `%s' message to client.\n",
1484 cnm->peer = n->peer;
1485 GNUNET_SERVER_transmit_context_append_message (tc,
1492 * Handle CORE_ITERATE_PEERS request.
1495 * @param client client sending the iteration request
1496 * @param message iteration request message
1499 handle_client_iterate_peers (void *cls,
1500 struct GNUNET_SERVER_Client *client,
1501 const struct GNUNET_MessageHeader *message)
1504 struct GNUNET_MessageHeader done_msg;
1505 struct GNUNET_SERVER_TransmitContext *tc;
1507 /* notify new client about existing neighbours */
1509 msize = ntohs(message->size);
1510 tc = GNUNET_SERVER_transmit_context_create (client);
1511 if (msize == sizeof(struct GNUNET_MessageHeader))
1512 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &queue_connect_message, tc);
1516 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1517 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
1518 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
1519 GNUNET_SERVER_transmit_context_run (tc,
1520 GNUNET_TIME_UNIT_FOREVER_REL);
1524 * Handle CORE_ITERATE_PEERS request. Notify client about existing neighbours.
1527 * @param client client sending the iteration request
1528 * @param message iteration request message
1531 handle_client_have_peer (void *cls,
1532 struct GNUNET_SERVER_Client *client,
1533 const struct GNUNET_MessageHeader *message)
1536 struct GNUNET_MessageHeader done_msg;
1537 struct GNUNET_SERVER_TransmitContext *tc;
1538 struct GNUNET_PeerIdentity *peer;
1540 tc = GNUNET_SERVER_transmit_context_create (client);
1541 peer = (struct GNUNET_PeerIdentity *) &message[1];
1542 GNUNET_CONTAINER_multihashmap_get_multiple(neighbours,
1544 &queue_connect_message,
1546 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1547 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
1548 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
1549 GNUNET_SERVER_transmit_context_run (tc,
1550 GNUNET_TIME_UNIT_FOREVER_REL);
1555 * Handle REQUEST_INFO request.
1558 * @param client client sending the request
1559 * @param message iteration request message
1562 handle_client_request_info (void *cls,
1563 struct GNUNET_SERVER_Client *client,
1564 const struct GNUNET_MessageHeader *message)
1566 const struct RequestInfoMessage *rcm;
1568 struct Neighbour *n;
1569 struct ConfigurationInfoMessage cim;
1570 int32_t want_reserv;
1572 unsigned long long old_preference;
1574 #if DEBUG_CORE_CLIENT
1575 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1576 "Core service receives `%s' request.\n", "REQUEST_INFO");
1581 if (client == pos->client_handle)
1588 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1592 rcm = (const struct RequestInfoMessage *) message;
1593 n = find_neighbour (&rcm->peer);
1594 memset (&cim, 0, sizeof (cim));
1597 want_reserv = ntohl (rcm->reserve_inbound);
1598 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1600 n->bw_out_internal_limit = rcm->limit_outbound;
1601 if (n->bw_out.value__ != GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1602 n->bw_out_external_limit).value__)
1604 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1605 n->bw_out_external_limit);
1606 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1608 GNUNET_TRANSPORT_set_quota (transport,
1612 GNUNET_TIME_UNIT_FOREVER_REL,
1614 handle_peer_status_change (n);
1617 if (want_reserv < 0)
1619 got_reserv = want_reserv;
1621 else if (want_reserv > 0)
1623 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1624 want_reserv).rel_value == 0)
1625 got_reserv = want_reserv;
1627 got_reserv = 0; /* all or nothing */
1631 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1633 old_preference = n->current_preference;
1634 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1635 if (old_preference > n->current_preference)
1637 /* overflow; cap at maximum value */
1638 n->current_preference = ULLONG_MAX;
1640 update_preference_sum (n->current_preference - old_preference);
1641 #if DEBUG_CORE_QUOTA
1642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1643 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1645 GNUNET_i2s (&rcm->peer),
1648 cim.reserved_amount = htonl (got_reserv);
1649 cim.rim_id = rcm->rim_id;
1650 cim.bw_out = n->bw_out;
1651 cim.preference = n->current_preference;
1653 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1654 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1655 cim.peer = rcm->peer;
1656 #if DEBUG_CORE_CLIENT
1657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1658 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1660 send_to_client (pos, &cim.header, GNUNET_NO);
1661 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1666 * Free the given entry for the neighbour (it has
1667 * already been removed from the list at this point).
1669 * @param n neighbour to free
1672 free_neighbour (struct Neighbour *n)
1674 struct MessageEntry *m;
1675 struct ClientActiveRequest *car;
1678 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1679 "Destroying neighbour entry for peer `%4s'\n",
1680 GNUNET_i2s (&n->peer));
1682 if (n->pitr != NULL)
1684 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1689 GNUNET_free (n->skm);
1692 while (NULL != (m = n->messages))
1694 n->messages = m->next;
1697 while (NULL != (m = n->encrypted_head))
1699 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1704 while (NULL != (car = n->active_client_request_head))
1706 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1707 n->active_client_request_tail,
1709 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
1710 &n->peer.hashPubKey,
1716 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1719 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1720 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
1721 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1722 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
1723 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1724 GNUNET_SCHEDULER_cancel (n->quota_update_task);
1725 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1726 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1727 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1728 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
1729 if (n->status == PEER_STATE_KEY_CONFIRMED)
1730 GNUNET_STATISTICS_update (stats,
1731 gettext_noop ("# established sessions"),
1734 GNUNET_array_grow (n->ats, n->ats_count, 0);
1735 GNUNET_free_non_null (n->public_key);
1736 GNUNET_free_non_null (n->pending_ping);
1737 GNUNET_free_non_null (n->pending_pong);
1743 * Check if we have encrypted messages for the specified neighbour
1744 * pending, and if so, check with the transport about sending them
1747 * @param n neighbour to check.
1749 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1753 * Encrypt size bytes from in and write the result to out. Use the
1754 * key for outbound traffic of the given neighbour.
1756 * @param n neighbour we are sending to
1757 * @param iv initialization vector to use
1758 * @param in ciphertext
1759 * @param out plaintext
1760 * @param size size of in/out
1761 * @return GNUNET_OK on success
1764 do_encrypt (struct Neighbour *n,
1765 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1766 const void *in, void *out, size_t size)
1768 if (size != (uint16_t) size)
1773 GNUNET_assert (size ==
1774 GNUNET_CRYPTO_aes_encrypt (in,
1778 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1781 "Encrypted %u bytes for `%4s' using key %u, IV %u\n",
1782 (unsigned int) size,
1783 GNUNET_i2s (&n->peer),
1784 (unsigned int) n->encrypt_key.crc32,
1785 GNUNET_CRYPTO_crc32_n (iv, sizeof(iv)));
1792 * Consider freeing the given neighbour since we may not need
1793 * to keep it around anymore.
1795 * @param n neighbour to consider discarding
1798 consider_free_neighbour (struct Neighbour *n);
1802 * Task triggered when a neighbour entry is about to time out
1803 * (and we should prevent this by sending a PING).
1805 * @param cls the 'struct Neighbour'
1806 * @param tc scheduler context (not used)
1809 send_keep_alive (void *cls,
1810 const struct GNUNET_SCHEDULER_TaskContext *tc)
1812 struct Neighbour *n = cls;
1813 struct GNUNET_TIME_Relative retry;
1814 struct GNUNET_TIME_Relative left;
1815 struct MessageEntry *me;
1816 struct PingMessage pp;
1817 struct PingMessage *pm;
1818 struct GNUNET_CRYPTO_AesInitializationVector iv;
1820 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1822 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1823 sizeof (struct PingMessage));
1824 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1825 me->priority = PING_PRIORITY;
1826 me->size = sizeof (struct PingMessage);
1827 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1831 pm = (struct PingMessage *) &me[1];
1832 pm->header.size = htons (sizeof (struct PingMessage));
1833 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1834 pm->iv_seed = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1836 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
1837 pp.challenge = n->ping_challenge;
1838 pp.target = n->peer;
1840 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1841 "Encrypting `%s' message with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
1843 (unsigned int) n->ping_challenge,
1844 GNUNET_i2s (&n->peer),
1845 (unsigned int) n->encrypt_key.crc32,
1846 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
1853 sizeof (struct PingMessage) -
1854 ((void *) &pm->target - (void *) pm));
1855 process_encrypted_neighbour_queue (n);
1856 /* reschedule PING job */
1857 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1858 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1859 MIN_PING_FREQUENCY);
1861 = GNUNET_SCHEDULER_add_delayed (retry,
1869 * Task triggered when a neighbour entry might have gotten stale.
1871 * @param cls the 'struct Neighbour'
1872 * @param tc scheduler context (not used)
1875 consider_free_task (void *cls,
1876 const struct GNUNET_SCHEDULER_TaskContext *tc)
1878 struct Neighbour *n = cls;
1880 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1881 consider_free_neighbour (n);
1886 * Consider freeing the given neighbour since we may not need
1887 * to keep it around anymore.
1889 * @param n neighbour to consider discarding
1892 consider_free_neighbour (struct Neighbour *n)
1894 struct GNUNET_TIME_Relative left;
1896 if ( (n->th != NULL) ||
1897 (n->pitr != NULL) ||
1898 (GNUNET_YES == n->is_connected) )
1899 return; /* no chance */
1901 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1902 if (left.rel_value > 0)
1904 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1905 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1906 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (left,
1907 &consider_free_task,
1911 /* actually free the neighbour... */
1912 GNUNET_assert (GNUNET_OK ==
1913 GNUNET_CONTAINER_multihashmap_remove (neighbours,
1914 &n->peer.hashPubKey,
1916 GNUNET_STATISTICS_set (stats,
1917 gettext_noop ("# neighbour entries allocated"),
1918 GNUNET_CONTAINER_multihashmap_size (neighbours),
1925 * Function called when the transport service is ready to
1926 * receive an encrypted message for the respective peer
1928 * @param cls neighbour to use message from
1929 * @param size number of bytes we can transmit
1930 * @param buf where to copy the message
1931 * @return number of bytes transmitted
1934 notify_encrypted_transmit_ready (void *cls,
1938 struct Neighbour *n = cls;
1939 struct MessageEntry *m;
1944 m = n->encrypted_head;
1948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1949 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1950 GNUNET_i2s (&n->peer));
1954 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1961 GNUNET_assert (size >= m->size);
1962 memcpy (cbuf, &m[1], m->size);
1964 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1967 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1968 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1969 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1971 GNUNET_i2s (&n->peer));
1973 process_encrypted_neighbour_queue (n);
1978 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1979 "Transmission of message of type %u and size %u failed\n",
1980 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1981 (unsigned int) m->size);
1985 consider_free_neighbour (n);
1986 GNUNET_STATISTICS_update (stats,
1987 gettext_noop ("# encrypted bytes given to transport"),
1995 * Check if we have plaintext messages for the specified neighbour
1996 * pending, and if so, consider batching and encrypting them (and
1997 * then trigger processing of the encrypted queue if needed).
1999 * @param n neighbour to check.
2001 static void process_plaintext_neighbour_queue (struct Neighbour *n);
2005 * Check if we have encrypted messages for the specified neighbour
2006 * pending, and if so, check with the transport about sending them
2009 * @param n neighbour to check.
2012 process_encrypted_neighbour_queue (struct Neighbour *n)
2014 struct MessageEntry *m;
2017 return; /* request already pending */
2018 m = n->encrypted_head;
2021 /* encrypted queue empty, try plaintext instead */
2022 process_plaintext_neighbour_queue (n);
2026 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2027 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
2028 (unsigned int) m->size,
2029 GNUNET_i2s (&n->peer),
2030 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
2033 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
2036 GNUNET_TIME_absolute_get_remaining
2038 ¬ify_encrypted_transmit_ready,
2042 /* message request too large or duplicate request */
2044 /* discard encrypted message */
2045 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
2049 process_encrypted_neighbour_queue (n);
2055 * Decrypt size bytes from in and write the result to out. Use the
2056 * key for inbound traffic of the given neighbour. This function does
2057 * NOT do any integrity-checks on the result.
2059 * @param n neighbour we are receiving from
2060 * @param iv initialization vector to use
2061 * @param in ciphertext
2062 * @param out plaintext
2063 * @param size size of in/out
2064 * @return GNUNET_OK on success
2067 do_decrypt (struct Neighbour *n,
2068 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
2069 const void *in, void *out, size_t size)
2071 if (size != (uint16_t) size)
2076 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
2077 (n->status != PEER_STATE_KEY_CONFIRMED))
2079 GNUNET_break_op (0);
2080 return GNUNET_SYSERR;
2083 GNUNET_CRYPTO_aes_decrypt (in,
2090 return GNUNET_SYSERR;
2092 GNUNET_STATISTICS_update (stats,
2093 gettext_noop ("# bytes decrypted"),
2097 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2098 "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
2099 (unsigned int) size,
2100 GNUNET_i2s (&n->peer),
2101 (unsigned int) n->decrypt_key.crc32,
2102 GNUNET_CRYPTO_crc32_n (iv, sizeof(*iv)));
2109 * Select messages for transmission. This heuristic uses a combination
2110 * of earliest deadline first (EDF) scheduling (with bounded horizon)
2111 * and priority-based discard (in case no feasible schedule exist) and
2112 * speculative optimization (defer any kind of transmission until
2113 * we either create a batch of significant size, 25% of max, or until
2114 * we are close to a deadline). Furthermore, when scheduling the
2115 * heuristic also packs as many messages into the batch as possible,
2116 * starting with those with the earliest deadline. Yes, this is fun.
2118 * @param n neighbour to select messages from
2119 * @param size number of bytes to select for transmission
2120 * @param retry_time set to the time when we should try again
2121 * (only valid if this function returns zero)
2122 * @return number of bytes selected, or 0 if we decided to
2123 * defer scheduling overall; in that case, retry_time is set.
2126 select_messages (struct Neighbour *n,
2127 size_t size, struct GNUNET_TIME_Relative *retry_time)
2129 struct MessageEntry *pos;
2130 struct MessageEntry *min;
2131 struct MessageEntry *last;
2132 unsigned int min_prio;
2133 struct GNUNET_TIME_Absolute t;
2134 struct GNUNET_TIME_Absolute now;
2135 struct GNUNET_TIME_Relative delta;
2137 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
2140 unsigned int queue_size;
2141 int discard_low_prio;
2143 GNUNET_assert (NULL != n->messages);
2144 now = GNUNET_TIME_absolute_get ();
2145 /* last entry in linked list of messages processed */
2147 /* should we remove the entry with the lowest
2148 priority from consideration for scheduling at the
2159 discard_low_prio = GNUNET_YES;
2160 while (GNUNET_YES == discard_low_prio)
2163 min_prio = UINT_MAX;
2164 discard_low_prio = GNUNET_NO;
2165 /* calculate number of bytes available for transmission at time "t" */
2166 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
2168 /* how many bytes have we (hypothetically) scheduled so far */
2170 /* maximum time we can wait before transmitting anything
2171 and still make all of our deadlines */
2172 slack = GNUNET_TIME_UNIT_FOREVER_REL;
2174 /* note that we use "*2" here because we want to look
2175 a bit further into the future; much more makes no
2176 sense since new message might be scheduled in the
2178 while ((pos != NULL) && (off < size * 2))
2180 if (pos->do_transmit == GNUNET_YES)
2182 /* already removed from consideration */
2186 if (discard_low_prio == GNUNET_NO)
2188 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
2189 if (delta.rel_value > 0)
2191 // FIXME: HUH? Check!
2193 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
2196 if (avail < pos->size)
2198 // FIXME: HUH? Check!
2199 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
2204 /* update slack, considering both its absolute deadline
2205 and relative deadlines caused by other messages
2206 with their respective load */
2207 slack = GNUNET_TIME_relative_min (slack,
2208 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
2210 if (pos->deadline.abs_value <= now.abs_value)
2213 slack = GNUNET_TIME_UNIT_ZERO;
2215 else if (GNUNET_YES == pos->got_slack)
2217 /* should be soon now! */
2218 slack = GNUNET_TIME_relative_min (slack,
2219 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
2224 GNUNET_TIME_relative_min (slack,
2225 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
2226 pos->got_slack = GNUNET_YES;
2227 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
2228 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
2233 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
2234 if (pos->priority <= min_prio)
2236 /* update min for discard */
2237 min_prio = pos->priority;
2242 if (discard_low_prio)
2244 GNUNET_assert (min != NULL);
2245 /* remove lowest-priority entry from consideration */
2246 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
2250 /* guard against sending "tiny" messages with large headers without
2252 if ( (slack.rel_value > GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value) &&
2254 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
2256 /* less than 25% of message would be filled with deadlines still
2257 being met if we delay by one second or more; so just wait for
2258 more data; but do not wait longer than 1s (since we don't want
2259 to delay messages for a really long time either). */
2260 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
2261 /* reset do_transmit values for next time */
2264 pos->do_transmit = GNUNET_NO;
2267 GNUNET_STATISTICS_update (stats,
2268 gettext_noop ("# transmissions delayed due to corking"),
2271 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2272 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
2273 (unsigned long long) retry_time->rel_value,
2275 (unsigned int) size);
2279 /* select marked messages (up to size) for transmission */
2284 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
2286 pos->do_transmit = GNUNET_YES; /* mark for transmission */
2290 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2291 "Selecting message of size %u for transmission\n",
2292 (unsigned int) pos->size);
2298 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2299 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
2300 (unsigned int) pos->size,
2303 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
2308 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2309 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
2310 (unsigned long long) off, (unsigned long long) tsize,
2311 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
2312 GNUNET_i2s (&n->peer));
2319 * Batch multiple messages into a larger buffer.
2321 * @param n neighbour to take messages from
2322 * @param buf target buffer
2323 * @param size size of buf
2324 * @param deadline set to transmission deadline for the result
2325 * @param retry_time set to the time when we should try again
2326 * (only valid if this function returns zero)
2327 * @param priority set to the priority of the batch
2328 * @return number of bytes written to buf (can be zero)
2331 batch_message (struct Neighbour *n,
2334 struct GNUNET_TIME_Absolute *deadline,
2335 struct GNUNET_TIME_Relative *retry_time,
2336 unsigned int *priority)
2338 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
2339 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
2340 struct MessageEntry *pos;
2341 struct MessageEntry *prev;
2342 struct MessageEntry *next;
2347 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2348 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
2349 if (0 == select_messages (n, size, retry_time))
2352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2353 "No messages selected, will try again in %llu ms\n",
2354 retry_time->rel_value);
2358 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
2359 ntm->ats_count = htonl (0);
2360 ntm->ats.type = htonl (0);
2361 ntm->ats.value = htonl (0);
2362 ntm->peer = n->peer;
2365 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
2368 if (GNUNET_YES == pos->do_transmit)
2370 GNUNET_assert (pos->size <= size);
2371 /* do notifications */
2372 /* FIXME: track if we have *any* client that wants
2373 full notifications and only do this if that is
2375 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
2377 memcpy (&ntm[1], &pos[1], pos->size);
2378 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2379 sizeof (struct GNUNET_MessageHeader));
2380 send_to_all_clients (&ntm->header,
2382 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
2386 /* message too large for 'full' notifications, we do at
2387 least the 'hdr' type */
2390 sizeof (struct GNUNET_MessageHeader));
2392 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2394 send_to_all_clients (&ntm->header,
2396 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
2398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2399 "Encrypting %u bytes with message of type %u and size %u\n",
2401 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
2402 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
2404 /* copy for encrypted transmission */
2405 memcpy (&buf[ret], &pos[1], pos->size);
2408 *priority += pos->priority;
2410 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2411 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
2412 (unsigned int) pos->size,
2413 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).rel_value);
2415 deadline->abs_value = GNUNET_MIN (deadline->abs_value, pos->deadline.abs_value);
2429 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2430 "Deadline for message batch is %llu ms\n",
2431 GNUNET_TIME_absolute_get_remaining (*deadline).rel_value);
2438 * Remove messages with deadlines that have long expired from
2441 * @param n neighbour to inspect
2444 discard_expired_messages (struct Neighbour *n)
2446 struct MessageEntry *prev;
2447 struct MessageEntry *next;
2448 struct MessageEntry *pos;
2449 struct GNUNET_TIME_Absolute now;
2450 struct GNUNET_TIME_Relative delta;
2454 now = GNUNET_TIME_absolute_get ();
2460 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
2461 if (delta.rel_value > PAST_EXPIRATION_DISCARD_TIME.rel_value)
2464 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2465 "Message is %llu ms past due, discarding.\n",
2472 GNUNET_STATISTICS_update (stats,
2473 gettext_noop ("# messages discarded (expired prior to transmission)"),
2483 if (GNUNET_YES == disc)
2484 schedule_peer_messages (n);
2489 * Signature of the main function of a task.
2491 * @param cls closure
2492 * @param tc context information (why was this task triggered now)
2495 retry_plaintext_processing (void *cls,
2496 const struct GNUNET_SCHEDULER_TaskContext *tc)
2498 struct Neighbour *n = cls;
2500 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2501 process_plaintext_neighbour_queue (n);
2506 * Send our key (and encrypted PING) to the other peer.
2508 * @param n the other peer
2510 static void send_key (struct Neighbour *n);
2513 * Task that will retry "send_key" if our previous attempt failed
2517 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2519 struct Neighbour *n = cls;
2522 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2523 "Retrying key transmission to `%4s'\n",
2524 GNUNET_i2s (&n->peer));
2526 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2527 n->set_key_retry_frequency =
2528 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
2534 * Check if we have plaintext messages for the specified neighbour
2535 * pending, and if so, consider batching and encrypting them (and
2536 * then trigger processing of the encrypted queue if needed).
2538 * @param n neighbour to check.
2541 process_plaintext_neighbour_queue (struct Neighbour *n)
2543 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
2545 struct EncryptedMessage *em; /* encrypted message */
2546 struct EncryptedMessage *ph; /* plaintext header */
2547 struct MessageEntry *me;
2548 unsigned int priority;
2549 struct GNUNET_TIME_Absolute deadline;
2550 struct GNUNET_TIME_Relative retry_time;
2551 struct GNUNET_CRYPTO_AesInitializationVector iv;
2552 struct GNUNET_CRYPTO_AuthKey auth_key;
2554 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
2556 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
2557 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2561 case PEER_STATE_DOWN:
2564 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2565 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2566 GNUNET_i2s(&n->peer));
2569 case PEER_STATE_KEY_SENT:
2570 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2571 n->retry_set_key_task
2572 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2573 &set_key_retry_task, n);
2575 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2576 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2577 GNUNET_i2s(&n->peer));
2580 case PEER_STATE_KEY_RECEIVED:
2581 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2582 n->retry_set_key_task
2583 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2584 &set_key_retry_task, n);
2586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2587 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2588 GNUNET_i2s(&n->peer));
2591 case PEER_STATE_KEY_CONFIRMED:
2592 /* ready to continue */
2595 discard_expired_messages (n);
2596 if (n->messages == NULL)
2599 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2600 "Plaintext message queue for `%4s' is empty.\n",
2601 GNUNET_i2s(&n->peer));
2603 return; /* no pending messages */
2605 if (n->encrypted_head != NULL)
2608 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2609 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2610 GNUNET_i2s(&n->peer));
2612 return; /* wait for messages already encrypted to be
2615 ph = (struct EncryptedMessage *) pbuf;
2616 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2618 used = sizeof (struct EncryptedMessage);
2619 used += batch_message (n,
2621 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2622 &deadline, &retry_time, &priority);
2623 if (used == sizeof (struct EncryptedMessage))
2626 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2627 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2628 GNUNET_i2s(&n->peer));
2630 /* no messages selected for sending, try again later... */
2631 n->retry_plaintext_task =
2632 GNUNET_SCHEDULER_add_delayed (retry_time,
2633 &retry_plaintext_processing, n);
2636 #if DEBUG_CORE_QUOTA
2637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2638 "Sending %u b/s as new limit to peer `%4s'\n",
2639 (unsigned int) ntohl (n->bw_in.value__),
2640 GNUNET_i2s (&n->peer));
2642 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
2643 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2644 ph->inbound_bw_limit = n->bw_in;
2645 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2647 /* setup encryption message header */
2648 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2649 me->deadline = deadline;
2650 me->priority = priority;
2652 em = (struct EncryptedMessage *) &me[1];
2653 em->header.size = htons (used);
2654 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2655 em->iv_seed = ph->iv_seed;
2656 derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
2659 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2660 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2661 (unsigned int) used - ENCRYPTED_HEADER_SIZE,
2662 GNUNET_i2s(&n->peer),
2663 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).rel_value);
2665 GNUNET_assert (GNUNET_OK ==
2668 &ph->sequence_number,
2669 &em->sequence_number, used - ENCRYPTED_HEADER_SIZE));
2670 derive_auth_key (&auth_key,
2673 n->encrypt_key_created);
2674 GNUNET_CRYPTO_hmac (&auth_key,
2675 &em->sequence_number,
2676 used - ENCRYPTED_HEADER_SIZE,
2679 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2680 "Authenticated %u bytes of ciphertext %u: `%s'\n",
2681 used - ENCRYPTED_HEADER_SIZE,
2682 GNUNET_CRYPTO_crc32_n (&em->sequence_number,
2683 used - ENCRYPTED_HEADER_SIZE),
2684 GNUNET_h2s (&em->hmac));
2686 /* append to transmission list */
2687 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2691 process_encrypted_neighbour_queue (n);
2692 schedule_peer_messages (n);
2697 * Function that recalculates the bandwidth quota for the
2698 * given neighbour and transmits it to the transport service.
2700 * @param cls neighbour for the quota update
2704 neighbour_quota_update (void *cls,
2705 const struct GNUNET_SCHEDULER_TaskContext *tc);
2709 * Schedule the task that will recalculate the bandwidth
2710 * quota for this peer (and possibly force a disconnect of
2711 * idle peers by calculating a bandwidth of zero).
2714 schedule_quota_update (struct Neighbour *n)
2716 GNUNET_assert (n->quota_update_task ==
2717 GNUNET_SCHEDULER_NO_TASK);
2718 n->quota_update_task
2719 = GNUNET_SCHEDULER_add_delayed (QUOTA_UPDATE_FREQUENCY,
2720 &neighbour_quota_update,
2726 * Initialize a new 'struct Neighbour'.
2728 * @param pid ID of the new neighbour
2729 * @return handle for the new neighbour
2731 static struct Neighbour *
2732 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2734 struct Neighbour *n;
2735 struct GNUNET_TIME_Absolute now;
2738 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2739 "Creating neighbour entry for peer `%4s'\n",
2742 n = GNUNET_malloc (sizeof (struct Neighbour));
2744 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2745 now = GNUNET_TIME_absolute_get ();
2746 n->encrypt_key_created = now;
2747 n->last_activity = now;
2748 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2749 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2750 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2751 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2752 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2753 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
2755 GNUNET_assert (GNUNET_OK ==
2756 GNUNET_CONTAINER_multihashmap_put (neighbours,
2757 &n->peer.hashPubKey,
2759 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2760 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
2761 GNUNET_CONTAINER_multihashmap_size (neighbours), GNUNET_NO);
2762 neighbour_quota_update (n, NULL);
2763 consider_free_neighbour (n);
2769 * Handle CORE_SEND request.
2772 * @param client the client issuing the request
2773 * @param message the "struct SendMessage"
2776 handle_client_send (void *cls,
2777 struct GNUNET_SERVER_Client *client,
2778 const struct GNUNET_MessageHeader *message)
2780 const struct SendMessage *sm;
2781 struct Neighbour *n;
2782 struct MessageEntry *prev;
2783 struct MessageEntry *pos;
2784 struct MessageEntry *e;
2785 struct MessageEntry *min_prio_entry;
2786 struct MessageEntry *min_prio_prev;
2787 unsigned int min_prio;
2788 unsigned int queue_size;
2791 msize = ntohs (message->size);
2793 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2795 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));
2798 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2801 sm = (const struct SendMessage *) message;
2802 msize -= sizeof (struct SendMessage);
2803 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2806 GNUNET_SERVER_mst_receive (mst,
2808 (const char*) &sm[1],
2813 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2816 n = find_neighbour (&sm->peer);
2818 n = create_neighbour (&sm->peer);
2820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2821 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2823 (unsigned int) msize,
2824 GNUNET_i2s (&sm->peer));
2826 discard_expired_messages (n);
2827 /* bound queue size */
2828 /* NOTE: this entire block to bound the queue size should be
2829 obsolete with the new client-request code and the
2830 'schedule_peer_messages' mechanism; we still have this code in
2831 here for now as a sanity check for the new mechanmism;
2832 ultimately, we should probably simply reject SEND messages that
2833 are not 'approved' (or provide a new core API for very unreliable
2834 delivery that always sends with priority 0). Food for thought. */
2835 min_prio = UINT32_MAX;
2836 min_prio_entry = NULL;
2837 min_prio_prev = NULL;
2843 if (pos->priority <= min_prio)
2845 min_prio_entry = pos;
2846 min_prio_prev = prev;
2847 min_prio = pos->priority;
2853 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2856 if (ntohl(sm->priority) <= min_prio)
2858 /* discard new entry; this should no longer happen! */
2861 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2862 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2864 (unsigned int) MAX_PEER_QUEUE_SIZE,
2865 (unsigned int) msize,
2866 (unsigned int) ntohs (message->type));
2868 GNUNET_STATISTICS_update (stats,
2869 gettext_noop ("# discarded CORE_SEND requests"),
2873 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2876 GNUNET_assert (min_prio_entry != NULL);
2877 /* discard "min_prio_entry" */
2879 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2880 "Queue full, discarding existing older request\n");
2882 GNUNET_STATISTICS_update (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 1, GNUNET_NO);
2883 if (min_prio_prev == NULL)
2884 n->messages = min_prio_entry->next;
2886 min_prio_prev->next = min_prio_entry->next;
2887 GNUNET_free (min_prio_entry);
2891 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2892 "Adding transmission request for `%4s' of size %u to queue\n",
2893 GNUNET_i2s (&sm->peer),
2894 (unsigned int) msize);
2896 GNUNET_break (0 == ntohl (sm->reserved));
2897 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2898 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2899 e->priority = ntohl (sm->priority);
2901 if (GNUNET_YES != (int) ntohl (sm->cork))
2902 e->got_slack = GNUNET_YES;
2903 memcpy (&e[1], &sm[1], msize);
2905 /* insert, keep list sorted by deadline */
2908 while ((pos != NULL) && (pos->deadline.abs_value < e->deadline.abs_value))
2919 /* consider scheduling now */
2920 process_plaintext_neighbour_queue (n);
2922 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2927 * Function called when the transport service is ready to
2928 * receive a message. Only resets 'n->th' to NULL.
2930 * @param cls neighbour to use message from
2931 * @param size number of bytes we can transmit
2932 * @param buf where to copy the message
2933 * @return number of bytes transmitted
2936 notify_transport_connect_done (void *cls,
2940 struct Neighbour *n = cls;
2943 if (GNUNET_YES != n->is_connected)
2945 /* transport should only call us to transmit a message after
2946 * telling us about a successful connection to the respective peer */
2948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2949 "Timeout on notify connect!\n");
2951 GNUNET_STATISTICS_update (stats,
2952 gettext_noop ("# connection requests timed out in transport"),
2959 GNUNET_STATISTICS_update (stats,
2960 gettext_noop ("# connection requests timed out in transport"),
2963 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2964 _("Failed to connect to `%4s': transport failed to connect\n"),
2965 GNUNET_i2s (&n->peer));
2968 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2969 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2970 GNUNET_i2s (&n->peer));
2971 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2972 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2973 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (&set_key_retry_task,
2980 * Handle CORE_REQUEST_CONNECT request.
2983 * @param client the client issuing the request
2984 * @param message the "struct ConnectMessage"
2987 handle_client_request_connect (void *cls,
2988 struct GNUNET_SERVER_Client *client,
2989 const struct GNUNET_MessageHeader *message)
2991 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2992 struct Neighbour *n;
2993 struct GNUNET_TIME_Relative timeout;
2995 if (0 == memcmp (&cm->peer,
2997 sizeof (struct GNUNET_PeerIdentity)))
2999 /* In this case a client has asked us to connect to ourselves, not really an error! */
3000 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3003 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
3004 GNUNET_break (ntohl (cm->reserved) == 0);
3005 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3006 n = find_neighbour (&cm->peer);
3008 n = create_neighbour (&cm->peer);
3009 if ( (GNUNET_YES == n->is_connected) ||
3012 if (GNUNET_YES == n->is_connected)
3013 GNUNET_STATISTICS_update (stats,
3014 gettext_noop ("# connection requests ignored (already connected)"),
3019 GNUNET_TRANSPORT_notify_transmit_ready_cancel(n->th);
3020 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3022 sizeof (struct GNUNET_MessageHeader), 0,
3024 ¬ify_transport_connect_done,
3026 GNUNET_break (NULL != n->th);
3027 GNUNET_STATISTICS_update (stats,
3028 gettext_noop ("# connection requests retried (due to repeat request connect)"),
3032 return; /* already connected, or at least trying */
3034 GNUNET_STATISTICS_update (stats,
3035 gettext_noop ("# connection requests received"),
3040 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3041 "Core received `%s' request for `%4s', will try to establish connection\n",
3043 GNUNET_i2s (&cm->peer));
3046 /* ask transport to connect to the peer */
3047 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3049 sizeof (struct GNUNET_MessageHeader), 0,
3051 ¬ify_transport_connect_done,
3053 GNUNET_break (NULL != n->th);
3058 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3059 * the neighbour's struct and retry send_key. Or, if we did not get a
3060 * HELLO, just do nothing.
3062 * @param cls the 'struct Neighbour' to retry sending the key for
3063 * @param peer the peer for which this is the HELLO
3064 * @param hello HELLO message of that peer
3065 * @param err_msg NULL if successful, otherwise contains error message
3068 process_hello_retry_send_key (void *cls,
3069 const struct GNUNET_PeerIdentity *peer,
3070 const struct GNUNET_HELLO_Message *hello,
3071 const char *err_msg)
3073 struct Neighbour *n = cls;
3075 if (err_msg != NULL)
3077 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3078 _("Error in communication with PEERINFO service\n"));
3085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3086 "Entered `%s' and `%s' is NULL!\n",
3087 "process_hello_retry_send_key",
3091 if (n->public_key != NULL)
3093 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3095 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3096 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3098 GNUNET_STATISTICS_update (stats,
3099 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3107 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3108 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
3109 GNUNET_i2s (&n->peer));
3111 GNUNET_STATISTICS_update (stats,
3112 gettext_noop ("# Delayed connecting due to lack of public key"),
3115 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
3116 n->retry_set_key_task
3117 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3118 &set_key_retry_task, n);
3124 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3125 "Entered `%s' for peer `%4s'\n",
3126 "process_hello_retry_send_key",
3129 if (n->public_key != NULL)
3131 /* already have public key, why are we here? */
3137 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3138 "Received new `%s' message for `%4s', initiating key exchange.\n",
3143 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3144 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3146 GNUNET_STATISTICS_update (stats,
3147 gettext_noop ("# Error extracting public key from HELLO"),
3150 GNUNET_free (n->public_key);
3151 n->public_key = NULL;
3153 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3154 "GNUNET_HELLO_get_key returned awfully\n");
3162 * Send our key (and encrypted PING) to the other peer.
3164 * @param n the other peer
3167 send_key (struct Neighbour *n)
3169 struct MessageEntry *pos;
3170 struct SetKeyMessage *sm;
3171 struct MessageEntry *me;
3172 struct PingMessage pp;
3173 struct PingMessage *pm;
3174 struct GNUNET_CRYPTO_AesInitializationVector iv;
3176 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3178 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3179 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3181 if (n->pitr != NULL)
3184 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3185 "Key exchange in progress with `%4s'.\n",
3186 GNUNET_i2s (&n->peer));
3188 return; /* already in progress */
3190 if (GNUNET_YES != n->is_connected)
3193 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3194 "Not yet connected to peer `%4s'!\n",
3195 GNUNET_i2s (&n->peer));
3199 GNUNET_STATISTICS_update (stats,
3200 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
3203 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3205 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
3207 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3208 ¬ify_encrypted_transmit_ready,
3214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3215 "Asked to perform key exchange with `%4s'.\n",
3216 GNUNET_i2s (&n->peer));
3218 if (n->public_key == NULL)
3220 /* lookup n's public key, then try again */
3222 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3223 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
3224 GNUNET_i2s (&n->peer));
3226 GNUNET_assert (n->pitr == NULL);
3227 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3229 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
3230 &process_hello_retry_send_key, n);
3233 pos = n->encrypted_head;
3236 if (GNUNET_YES == pos->is_setkey)
3238 if (pos->sender_status == n->status)
3241 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3242 "`%s' message for `%4s' queued already\n",
3244 GNUNET_i2s (&n->peer));
3246 goto trigger_processing;
3248 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
3253 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3254 "Removing queued `%s' message for `%4s', will create a new one\n",
3256 GNUNET_i2s (&n->peer));
3266 case PEER_STATE_DOWN:
3267 n->status = PEER_STATE_KEY_SENT;
3269 case PEER_STATE_KEY_SENT:
3271 case PEER_STATE_KEY_RECEIVED:
3273 case PEER_STATE_KEY_CONFIRMED:
3281 /* first, set key message */
3282 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3283 sizeof (struct SetKeyMessage) +
3284 sizeof (struct PingMessage));
3285 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
3286 me->priority = SET_KEY_PRIORITY;
3287 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
3288 me->is_setkey = GNUNET_YES;
3289 me->got_slack = GNUNET_YES; /* do not defer this one! */
3290 me->sender_status = n->status;
3291 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3295 sm = (struct SetKeyMessage *) &me[1];
3296 sm->header.size = htons (sizeof (struct SetKeyMessage));
3297 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
3298 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
3299 PEER_STATE_KEY_SENT : n->status));
3301 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3302 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3303 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3304 sizeof (struct GNUNET_PeerIdentity));
3305 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
3306 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
3307 sm->target = n->peer;
3308 GNUNET_assert (GNUNET_OK ==
3309 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
3311 GNUNET_CRYPTO_AesSessionKey),
3313 &sm->encrypted_key));
3314 GNUNET_assert (GNUNET_OK ==
3315 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
3317 pm = (struct PingMessage *) &sm[1];
3318 pm->header.size = htons (sizeof (struct PingMessage));
3319 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
3320 pm->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3321 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
3322 pp.challenge = n->ping_challenge;
3323 pp.target = n->peer;
3325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3326 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
3328 (unsigned int) n->ping_challenge,
3329 GNUNET_i2s (&n->peer),
3330 (unsigned int) n->encrypt_key.crc32,
3331 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3338 sizeof (struct PingMessage) -
3339 ((void *) &pm->target - (void *) pm));
3340 GNUNET_STATISTICS_update (stats,
3341 gettext_noop ("# SET_KEY and PING messages created"),
3345 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3346 "Have %llu ms left for `%s' transmission.\n",
3347 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).rel_value,
3351 /* trigger queue processing */
3352 process_encrypted_neighbour_queue (n);
3353 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
3354 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
3355 n->retry_set_key_task
3356 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3357 &set_key_retry_task, n);
3362 * We received a SET_KEY message. Validate and update
3363 * our key material and status.
3365 * @param n the neighbour from which we received message m
3366 * @param m the set key message we received
3367 * @param ats performance data
3368 * @param ats_count number of entries in ats (excluding 0-termination)
3371 handle_set_key (struct Neighbour *n,
3372 const struct SetKeyMessage *m,
3373 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3374 uint32_t ats_count);
3379 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3380 * the neighbour's struct and retry handling the set_key message. Or,
3381 * if we did not get a HELLO, just free the set key message.
3383 * @param cls pointer to the set key message
3384 * @param peer the peer for which this is the HELLO
3385 * @param hello HELLO message of that peer
3386 * @param err_msg NULL if successful, otherwise contains error message
3389 process_hello_retry_handle_set_key (void *cls,
3390 const struct GNUNET_PeerIdentity *peer,
3391 const struct GNUNET_HELLO_Message *hello,
3392 const char *err_msg)
3394 struct Neighbour *n = cls;
3395 struct SetKeyMessage *sm = n->skm;
3397 if (err_msg != NULL)
3399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3400 _("Error in communication with PEERINFO service\n"));
3408 if (n->public_key != NULL)
3411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3412 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
3414 GNUNET_i2s (&n->peer),
3417 handle_set_key (n, sm, NULL, 0);
3421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3422 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
3424 GNUNET_i2s (&n->peer));
3429 if (n->public_key != NULL)
3430 return; /* multiple HELLOs match!? */
3432 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3433 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3435 GNUNET_break_op (0);
3436 GNUNET_free (n->public_key);
3437 n->public_key = NULL;
3443 * Merge the given performance data with the data we currently
3444 * track for the given neighbour.
3446 * @param n neighbour
3447 * @param ats new performance data
3448 * @param ats_count number of records in ats
3451 update_neighbour_performance (struct Neighbour *n,
3452 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3460 for (i = 0; i < ats_count; i++)
3462 for (j=0;j < n->ats_count; j++)
3464 if (n->ats[j].type == ats[i].type)
3466 n->ats[j].value = ats[i].value;
3470 if (j == n->ats_count)
3472 GNUNET_array_append (n->ats,
3481 * We received a PING message. Validate and transmit
3484 * @param n sender of the PING
3485 * @param m the encrypted PING message itself
3486 * @param ats performance data
3487 * @param ats_count number of entries in ats (excluding 0-termination)
3490 handle_ping (struct Neighbour *n,
3491 const struct PingMessage *m,
3492 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3495 struct PingMessage t;
3496 struct PongMessage tx;
3497 struct PongMessage *tp;
3498 struct MessageEntry *me;
3499 struct GNUNET_CRYPTO_AesInitializationVector iv;
3502 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3503 "Core service receives `%s' request from `%4s'.\n",
3504 "PING", GNUNET_i2s (&n->peer));
3506 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3512 sizeof (struct PingMessage) -
3513 ((void *) &m->target - (void *) m)))
3516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3517 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
3519 GNUNET_i2s (&t.target),
3520 (unsigned int) t.challenge,
3521 (unsigned int) n->decrypt_key.crc32,
3522 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3525 GNUNET_STATISTICS_update (stats,
3526 gettext_noop ("# PING messages decrypted"),
3529 if (0 != memcmp (&t.target,
3530 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3532 GNUNET_break_op (0);
3535 update_neighbour_performance (n, ats, ats_count);
3536 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3537 sizeof (struct PongMessage));
3538 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3542 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
3543 me->priority = PONG_PRIORITY;
3544 me->size = sizeof (struct PongMessage);
3545 tx.inbound_bw_limit = n->bw_in;
3546 tx.challenge = t.challenge;
3547 tx.target = t.target;
3548 tp = (struct PongMessage *) &me[1];
3549 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
3550 tp->header.size = htons (sizeof (struct PongMessage));
3551 tp->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3552 derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
3557 sizeof (struct PongMessage) -
3558 ((void *) &tp->challenge - (void *) tp));
3559 GNUNET_STATISTICS_update (stats,
3560 gettext_noop ("# PONG messages created"),
3564 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3565 "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
3567 (unsigned int) t.challenge,
3568 (unsigned int) n->encrypt_key.crc32,
3569 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3572 /* trigger queue processing */
3573 process_encrypted_neighbour_queue (n);
3578 * We received a PONG message. Validate and update our status.
3580 * @param n sender of the PONG
3581 * @param m the encrypted PONG message itself
3582 * @param ats performance data
3583 * @param ats_count number of entries in ats (excluding 0-termination)
3586 handle_pong (struct Neighbour *n,
3587 const struct PongMessage *m,
3588 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3591 struct PongMessage t;
3592 struct ConnectNotifyMessage *cnm;
3593 struct GNUNET_CRYPTO_AesInitializationVector iv;
3594 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
3595 struct GNUNET_TRANSPORT_ATS_Information *mats;
3599 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3600 "Core service receives `%s' response from `%4s'.\n",
3601 "PONG", GNUNET_i2s (&n->peer));
3603 /* mark as garbage, just to be sure */
3604 memset (&t, 255, sizeof (t));
3605 derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
3612 sizeof (struct PongMessage) -
3613 ((void *) &m->challenge - (void *) m)))
3615 GNUNET_break_op (0);
3618 GNUNET_STATISTICS_update (stats,
3619 gettext_noop ("# PONG messages decrypted"),
3623 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3624 "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
3626 GNUNET_i2s (&t.target),
3627 (unsigned int) t.challenge,
3628 (unsigned int) n->decrypt_key.crc32,
3629 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3632 if ((0 != memcmp (&t.target,
3634 sizeof (struct GNUNET_PeerIdentity))) ||
3635 (n->ping_challenge != t.challenge))
3637 /* PONG malformed */
3639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3640 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
3642 GNUNET_i2s (&n->peer),
3643 (unsigned int) n->ping_challenge);
3644 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3645 "Received malformed `%s' received from `%4s' with challenge %u\n",
3646 "PONG", GNUNET_i2s (&t.target),
3647 (unsigned int) t.challenge);
3649 GNUNET_break_op (n->ping_challenge != t.challenge);
3654 case PEER_STATE_DOWN:
3655 GNUNET_break (0); /* should be impossible */
3657 case PEER_STATE_KEY_SENT:
3658 GNUNET_break (0); /* should be impossible, how did we decrypt? */
3660 case PEER_STATE_KEY_RECEIVED:
3661 GNUNET_STATISTICS_update (stats,
3662 gettext_noop ("# Session keys confirmed via PONG"),
3665 n->status = PEER_STATE_KEY_CONFIRMED;
3666 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
3668 n->bw_out_external_limit = t.inbound_bw_limit;
3669 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3670 n->bw_out_internal_limit);
3671 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3673 GNUNET_TRANSPORT_set_quota (transport,
3677 GNUNET_TIME_UNIT_FOREVER_REL,
3681 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3682 "Confirmed key via `%s' message for peer `%4s'\n",
3683 "PONG", GNUNET_i2s (&n->peer));
3685 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3687 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3688 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3690 update_neighbour_performance (n, ats, ats_count);
3691 size = sizeof (struct ConnectNotifyMessage) +
3692 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3693 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3696 /* recovery strategy: throw away performance data */
3697 GNUNET_array_grow (n->ats,
3700 size = sizeof (struct PeerStatusNotifyMessage) +
3701 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3703 cnm = (struct ConnectNotifyMessage*) buf;
3704 cnm->header.size = htons (size);
3705 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
3706 cnm->ats_count = htonl (n->ats_count);
3707 cnm->peer = n->peer;
3711 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
3712 mats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3713 mats[n->ats_count].value = htonl (0);
3714 send_to_all_clients (&cnm->header,
3716 GNUNET_CORE_OPTION_SEND_CONNECT);
3717 process_encrypted_neighbour_queue (n);
3719 case PEER_STATE_KEY_CONFIRMED:
3720 n->last_activity = GNUNET_TIME_absolute_get ();
3721 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3722 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3724 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3727 handle_peer_status_change (n);
3737 * We received a SET_KEY message. Validate and update
3738 * our key material and status.
3740 * @param n the neighbour from which we received message m
3741 * @param m the set key message we received
3742 * @param ats performance data
3743 * @param ats_count number of entries in ats (excluding 0-termination)
3746 handle_set_key (struct Neighbour *n,
3747 const struct SetKeyMessage *m,
3748 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3751 struct SetKeyMessage *m_cpy;
3752 struct GNUNET_TIME_Absolute t;
3753 struct GNUNET_CRYPTO_AesSessionKey k;
3754 struct PingMessage *ping;
3755 struct PongMessage *pong;
3756 enum PeerStateMachine sender_status;
3759 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3760 "Core service receives `%s' request from `%4s'.\n",
3761 "SET_KEY", GNUNET_i2s (&n->peer));
3763 if (n->public_key == NULL)
3765 if (n->pitr != NULL)
3768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3769 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3775 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3776 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3778 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3779 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3780 /* lookup n's public key, then try again */
3781 GNUNET_assert (n->skm == NULL);
3783 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3785 GNUNET_TIME_UNIT_MINUTES,
3786 &process_hello_retry_handle_set_key, n);
3787 GNUNET_STATISTICS_update (stats,
3788 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3793 if (0 != memcmp (&m->target,
3795 sizeof (struct GNUNET_PeerIdentity)))
3797 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3798 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3800 GNUNET_i2s (&m->target));
3803 if ((ntohl (m->purpose.size) !=
3804 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3805 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3806 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3807 sizeof (struct GNUNET_PeerIdentity)) ||
3809 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3810 &m->purpose, &m->signature, n->public_key)))
3812 /* invalid signature */
3813 GNUNET_break_op (0);
3816 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3817 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3818 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3819 (t.abs_value < n->decrypt_key_created.abs_value))
3821 /* this could rarely happen due to massive re-ordering of
3822 messages on the network level, but is most likely either
3823 a bug or some adversary messing with us. Report. */
3824 GNUNET_break_op (0);
3828 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3829 "Decrypting key material.\n");
3831 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3834 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3835 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3836 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3838 /* failed to decrypt !? */
3839 GNUNET_break_op (0);
3842 GNUNET_STATISTICS_update (stats,
3843 gettext_noop ("# SET_KEY messages decrypted"),
3847 if (n->decrypt_key_created.abs_value != t.abs_value)
3849 /* fresh key, reset sequence numbers */
3850 n->last_sequence_number_received = 0;
3851 n->last_packets_bitmap = 0;
3852 n->decrypt_key_created = t;
3854 update_neighbour_performance (n, ats, ats_count);
3855 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3858 case PEER_STATE_DOWN:
3859 n->status = PEER_STATE_KEY_RECEIVED;
3861 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3862 "Responding to `%s' with my own key.\n", "SET_KEY");
3866 case PEER_STATE_KEY_SENT:
3867 case PEER_STATE_KEY_RECEIVED:
3868 n->status = PEER_STATE_KEY_RECEIVED;
3869 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3870 (sender_status != PEER_STATE_KEY_CONFIRMED))
3873 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3874 "Responding to `%s' with my own key (other peer has status %u).\n",
3876 (unsigned int) sender_status);
3881 case PEER_STATE_KEY_CONFIRMED:
3882 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3883 (sender_status != PEER_STATE_KEY_CONFIRMED))
3886 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3887 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3889 (unsigned int) sender_status);
3898 if (n->pending_ping != NULL)
3900 ping = n->pending_ping;
3901 n->pending_ping = NULL;
3902 handle_ping (n, ping, NULL, 0);
3905 if (n->pending_pong != NULL)
3907 pong = n->pending_pong;
3908 n->pending_pong = NULL;
3909 handle_pong (n, pong, NULL, 0);
3916 * Send a P2P message to a client.
3918 * @param sender who sent us the message?
3919 * @param client who should we give the message to?
3920 * @param m contains the message to transmit
3921 * @param msize number of bytes in buf to transmit
3924 send_p2p_message_to_client (struct Neighbour *sender,
3925 struct Client *client,
3926 const void *m, size_t msize)
3928 size_t size = msize + sizeof (struct NotifyTrafficMessage) +
3929 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3931 struct NotifyTrafficMessage *ntm;
3932 struct GNUNET_TRANSPORT_ATS_Information *ats;
3934 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3937 /* recovery strategy: throw performance data away... */
3938 GNUNET_array_grow (sender->ats,
3941 size = msize + sizeof (struct NotifyTrafficMessage) +
3942 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3945 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3946 "Core service passes message from `%4s' of type %u to client.\n",
3947 GNUNET_i2s(&sender->peer),
3948 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3950 ntm = (struct NotifyTrafficMessage *) buf;
3951 ntm->header.size = htons (size);
3952 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3953 ntm->ats_count = htonl (sender->ats_count);
3954 ntm->peer = sender->peer;
3958 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * sender->ats_count);
3959 ats[sender->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3960 ats[sender->ats_count].value = htonl (0);
3961 memcpy (&ats[sender->ats_count+1],
3964 send_to_client (client, &ntm->header, GNUNET_YES);
3969 * Deliver P2P message to interested clients.
3971 * @param cls always NULL
3972 * @param client who sent us the message (struct Neighbour)
3973 * @param m the message
3976 deliver_message (void *cls,
3978 const struct GNUNET_MessageHeader *m)
3980 struct Neighbour *sender = client;
3981 size_t msize = ntohs (m->size);
3983 struct Client *cpos;
3989 type = ntohs (m->type);
3991 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3992 "Received encapsulated message of type %u and size %u from `%4s'\n",
3993 (unsigned int) type,
3995 GNUNET_i2s (&sender->peer));
3997 GNUNET_snprintf (buf,
3999 gettext_noop ("# bytes of messages of type %u received"),
4000 (unsigned int) type);
4001 GNUNET_STATISTICS_set (stats,
4005 dropped = GNUNET_YES;
4007 while (cpos != NULL)
4009 deliver_full = GNUNET_NO;
4010 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
4011 deliver_full = GNUNET_YES;
4014 for (tpos = 0; tpos < cpos->tcnt; tpos++)
4016 if (type != cpos->types[tpos])
4018 deliver_full = GNUNET_YES;
4022 if (GNUNET_YES == deliver_full)
4024 send_p2p_message_to_client (sender, cpos, m, msize);
4025 dropped = GNUNET_NO;
4027 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
4029 send_p2p_message_to_client (sender, cpos, m,
4030 sizeof (struct GNUNET_MessageHeader));
4034 if (dropped == GNUNET_YES)
4037 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4038 "Message of type %u from `%4s' not delivered to any client.\n",
4039 (unsigned int) type,
4040 GNUNET_i2s (&sender->peer));
4042 GNUNET_STATISTICS_update (stats,
4043 gettext_noop ("# messages not delivered to any client"),
4050 * We received an encrypted message. Decrypt, validate and
4051 * pass on to the appropriate clients.
4053 * @param n target of the message
4054 * @param m encrypted message
4055 * @param ats performance data
4056 * @param ats_count number of entries in ats (excluding 0-termination)
4059 handle_encrypted_message (struct Neighbour *n,
4060 const struct EncryptedMessage *m,
4061 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4064 size_t size = ntohs (m->header.size);
4066 struct EncryptedMessage *pt; /* plaintext */
4069 struct GNUNET_TIME_Absolute t;
4070 struct GNUNET_CRYPTO_AesInitializationVector iv;
4071 struct GNUNET_CRYPTO_AuthKey auth_key;
4074 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4075 "Core service receives `%s' request from `%4s'.\n",
4076 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
4079 derive_auth_key (&auth_key,
4082 n->decrypt_key_created);
4083 GNUNET_CRYPTO_hmac (&auth_key,
4084 &m->sequence_number,
4085 size - ENCRYPTED_HEADER_SIZE, &ph);
4087 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4088 "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
4089 (unsigned int) size - ENCRYPTED_HEADER_SIZE,
4090 GNUNET_CRYPTO_crc32_n (&m->sequence_number,
4091 size - ENCRYPTED_HEADER_SIZE),
4095 if (0 != memcmp (&ph,
4097 sizeof (GNUNET_HashCode)))
4099 /* checksum failed */
4100 GNUNET_break_op (0);
4103 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
4108 &m->sequence_number,
4109 &buf[ENCRYPTED_HEADER_SIZE],
4110 size - ENCRYPTED_HEADER_SIZE))
4112 pt = (struct EncryptedMessage *) buf;
4114 /* validate sequence number */
4115 snum = ntohl (pt->sequence_number);
4116 if (n->last_sequence_number_received == snum)
4118 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4119 "Received duplicate message, ignoring.\n");
4120 /* duplicate, ignore */
4121 GNUNET_STATISTICS_set (stats,
4122 gettext_noop ("# bytes dropped (duplicates)"),
4127 if ((n->last_sequence_number_received > snum) &&
4128 (n->last_sequence_number_received - snum > 32))
4130 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4131 "Received ancient out of sequence message, ignoring.\n");
4132 /* ancient out of sequence, ignore */
4133 GNUNET_STATISTICS_set (stats,
4134 gettext_noop ("# bytes dropped (out of sequence)"),
4139 if (n->last_sequence_number_received > snum)
4141 unsigned int rotbit =
4142 1 << (n->last_sequence_number_received - snum - 1);
4143 if ((n->last_packets_bitmap & rotbit) != 0)
4145 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4146 "Received duplicate message, ignoring.\n");
4147 GNUNET_STATISTICS_set (stats,
4148 gettext_noop ("# bytes dropped (duplicates)"),
4151 /* duplicate, ignore */
4154 n->last_packets_bitmap |= rotbit;
4156 if (n->last_sequence_number_received < snum)
4158 int shift = (snum - n->last_sequence_number_received);
4159 if (shift >= 8 * sizeof(n->last_packets_bitmap))
4160 n->last_packets_bitmap = 0;
4162 n->last_packets_bitmap <<= shift;
4163 n->last_sequence_number_received = snum;
4166 /* check timestamp */
4167 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
4168 if (GNUNET_TIME_absolute_get_duration (t).rel_value > MAX_MESSAGE_AGE.rel_value)
4170 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4172 ("Message received far too old (%llu ms). Content ignored.\n"),
4173 GNUNET_TIME_absolute_get_duration (t).rel_value);
4174 GNUNET_STATISTICS_set (stats,
4175 gettext_noop ("# bytes dropped (ancient message)"),
4181 /* process decrypted message(s) */
4182 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
4184 #if DEBUG_CORE_SET_QUOTA
4185 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4186 "Received %u b/s as new inbound limit for peer `%4s'\n",
4187 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
4188 GNUNET_i2s (&n->peer));
4190 n->bw_out_external_limit = pt->inbound_bw_limit;
4191 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
4192 n->bw_out_internal_limit);
4193 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
4195 GNUNET_TRANSPORT_set_quota (transport,
4199 GNUNET_TIME_UNIT_FOREVER_REL,
4202 n->last_activity = GNUNET_TIME_absolute_get ();
4203 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4204 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4206 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4209 GNUNET_STATISTICS_set (stats,
4210 gettext_noop ("# bytes of payload decrypted"),
4211 size - sizeof (struct EncryptedMessage),
4213 handle_peer_status_change (n);
4214 update_neighbour_performance (n, ats, ats_count);
4215 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
4217 &buf[sizeof (struct EncryptedMessage)],
4218 size - sizeof (struct EncryptedMessage),
4219 GNUNET_YES, GNUNET_NO))
4220 GNUNET_break_op (0);
4225 * Function called by the transport for each received message.
4227 * @param cls closure
4228 * @param peer (claimed) identity of the other peer
4229 * @param message the message
4230 * @param ats performance data
4231 * @param ats_count number of entries in ats (excluding 0-termination)
4234 handle_transport_receive (void *cls,
4235 const struct GNUNET_PeerIdentity *peer,
4236 const struct GNUNET_MessageHeader *message,
4237 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4240 struct Neighbour *n;
4241 struct GNUNET_TIME_Absolute now;
4248 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4249 "Received message of type %u from `%4s', demultiplexing.\n",
4250 (unsigned int) ntohs (message->type),
4253 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4258 n = find_neighbour (peer);
4260 n = create_neighbour (peer);
4261 changed = GNUNET_NO;
4262 up = (n->status == PEER_STATE_KEY_CONFIRMED);
4263 type = ntohs (message->type);
4264 size = ntohs (message->size);
4267 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
4268 if (size != sizeof (struct SetKeyMessage))
4270 GNUNET_break_op (0);
4273 GNUNET_STATISTICS_update (stats,
4274 gettext_noop ("# session keys received"),
4278 (const struct SetKeyMessage *) message,
4281 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
4282 if (size < sizeof (struct EncryptedMessage) +
4283 sizeof (struct GNUNET_MessageHeader))
4285 GNUNET_break_op (0);
4288 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4289 (n->status != PEER_STATE_KEY_CONFIRMED))
4291 GNUNET_STATISTICS_update (stats,
4292 gettext_noop ("# failed to decrypt message (no session key)"),
4298 handle_encrypted_message (n,
4299 (const struct EncryptedMessage *) message,
4302 case GNUNET_MESSAGE_TYPE_CORE_PING:
4303 if (size != sizeof (struct PingMessage))
4305 GNUNET_break_op (0);
4308 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
4309 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4310 (n->status != PEER_STATE_KEY_CONFIRMED))
4313 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4314 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4315 "PING", GNUNET_i2s (&n->peer));
4317 GNUNET_free_non_null (n->pending_ping);
4318 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
4319 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
4322 handle_ping (n, (const struct PingMessage *) message,
4325 case GNUNET_MESSAGE_TYPE_CORE_PONG:
4326 if (size != sizeof (struct PongMessage))
4328 GNUNET_break_op (0);
4331 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
4332 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
4333 (n->status != PEER_STATE_KEY_CONFIRMED) )
4336 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4337 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4338 "PONG", GNUNET_i2s (&n->peer));
4340 GNUNET_free_non_null (n->pending_pong);
4341 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
4342 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
4345 handle_pong (n, (const struct PongMessage *) message,
4349 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4350 _("Unsupported message of type %u received.\n"),
4351 (unsigned int) type);
4354 if (n->status == PEER_STATE_KEY_CONFIRMED)
4356 now = GNUNET_TIME_absolute_get ();
4357 n->last_activity = now;
4358 changed = GNUNET_YES;
4361 GNUNET_STATISTICS_update (stats,
4362 gettext_noop ("# established sessions"),
4365 n->time_established = now;
4367 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4368 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4370 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4375 handle_peer_status_change (n);
4380 * Function that recalculates the bandwidth quota for the
4381 * given neighbour and transmits it to the transport service.
4383 * @param cls neighbour for the quota update
4387 neighbour_quota_update (void *cls,
4388 const struct GNUNET_SCHEDULER_TaskContext *tc)
4390 struct Neighbour *n = cls;
4391 struct GNUNET_BANDWIDTH_Value32NBO q_in;
4392 struct GNUNET_BANDWIDTH_Value32NBO q_out;
4393 struct GNUNET_BANDWIDTH_Value32NBO q_out_min;
4396 unsigned long long distributable;
4397 uint64_t need_per_peer;
4398 uint64_t need_per_second;
4399 unsigned int neighbour_count;
4402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4403 "Neighbour quota update calculation running for peer `%4s'\n",
4404 GNUNET_i2s (&n->peer));
4406 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
4407 /* calculate relative preference among all neighbours;
4408 divides by a bit more to avoid division by zero AND to
4409 account for possibility of new neighbours joining any time
4410 AND to convert to double... */
4411 neighbour_count = GNUNET_CONTAINER_multihashmap_size (neighbours);
4412 if (neighbour_count == 0)
4414 if (preference_sum == 0)
4416 pref_rel = 1.0 / (double) neighbour_count;
4420 pref_rel = n->current_preference / preference_sum;
4422 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
4423 GNUNET_TIME_UNIT_SECONDS);
4424 need_per_second = need_per_peer * neighbour_count;
4426 /* calculate inbound bandwidth per peer */
4428 if (bandwidth_target_in_bps > need_per_second)
4429 distributable = bandwidth_target_in_bps - need_per_second;
4430 share = distributable * pref_rel;
4431 if (share + need_per_peer > UINT32_MAX)
4432 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4434 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4436 /* calculate outbound bandwidth per peer */
4438 if (bandwidth_target_out_bps > need_per_second)
4439 distributable = bandwidth_target_out_bps - need_per_second;
4440 share = distributable * pref_rel;
4441 if (share + need_per_peer > UINT32_MAX)
4442 q_out = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4444 q_out = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4445 n->bw_out_internal_limit = q_out;
4447 q_out_min = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit, n->bw_out_internal_limit);
4448 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window, n->bw_out);
4450 /* check if we want to disconnect for good due to inactivity */
4451 if ( (GNUNET_TIME_absolute_get_duration (get_neighbour_timeout (n)).rel_value > 0) &&
4452 (GNUNET_TIME_absolute_get_duration (n->time_established).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) )
4455 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4456 "Forcing disconnect of `%4s' due to inactivity\n",
4457 GNUNET_i2s (&n->peer));
4459 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
4461 #if DEBUG_CORE_QUOTA
4462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4463 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
4464 GNUNET_i2s (&n->peer),
4465 (unsigned int) ntohl (q_in.value__),
4466 bandwidth_target_out_bps,
4467 (unsigned int) ntohl (n->bw_in.value__),
4468 (unsigned int) ntohl (n->bw_out.value__),
4469 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
4471 if ((n->bw_in.value__ != q_in.value__) || (n->bw_out.value__ != q_out_min.value__))
4473 if (n->bw_in.value__ != q_in.value__)
4475 if (n->bw_out.value__ != q_out_min.value__)
4476 n->bw_out = q_out_min;
4477 if (GNUNET_YES == n->is_connected)
4478 GNUNET_TRANSPORT_set_quota (transport,
4482 GNUNET_TIME_UNIT_FOREVER_REL,
4484 handle_peer_status_change (n);
4486 schedule_quota_update (n);
4491 * Function called by transport to notify us that
4492 * a peer connected to us (on the network level).
4494 * @param cls closure
4495 * @param peer the peer that connected
4496 * @param ats performance data
4497 * @param ats_count number of entries in ats (excluding 0-termination)
4500 handle_transport_notify_connect (void *cls,
4501 const struct GNUNET_PeerIdentity *peer,
4502 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4505 struct Neighbour *n;
4507 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4512 n = find_neighbour (peer);
4515 if (GNUNET_YES == n->is_connected)
4517 /* duplicate connect notification!? */
4524 n = create_neighbour (peer);
4526 GNUNET_STATISTICS_update (stats,
4527 gettext_noop ("# peers connected (transport)"),
4530 n->is_connected = GNUNET_YES;
4531 update_neighbour_performance (n, ats, ats_count);
4532 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
4535 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
4539 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4540 "Received connection from `%4s'.\n",
4541 GNUNET_i2s (&n->peer));
4543 GNUNET_TRANSPORT_set_quota (transport,
4547 GNUNET_TIME_UNIT_FOREVER_REL,
4554 * Function called by transport telling us that a peer
4557 * @param cls closure
4558 * @param peer the peer that disconnected
4561 handle_transport_notify_disconnect (void *cls,
4562 const struct GNUNET_PeerIdentity *peer)
4564 struct DisconnectNotifyMessage cnm;
4565 struct Neighbour *n;
4566 struct ClientActiveRequest *car;
4567 struct GNUNET_TIME_Relative left;
4570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4571 "Peer `%4s' disconnected from us; received notification from transport.\n",
4574 n = find_neighbour (peer);
4580 GNUNET_break (n->is_connected == GNUNET_YES);
4581 if (n->status == PEER_STATE_KEY_CONFIRMED)
4583 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
4584 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
4585 cnm.reserved = htonl (0);
4587 send_to_all_clients (&cnm.header, GNUNET_NO, GNUNET_CORE_OPTION_SEND_DISCONNECT);
4588 GNUNET_STATISTICS_update (stats,
4589 gettext_noop ("# established sessions"),
4594 /* On transport disconnect transport doesn't cancel requests, so must do so here. */
4597 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
4600 n->is_connected = GNUNET_NO;
4601 n->status = PEER_STATE_DOWN;
4602 while (NULL != (car = n->active_client_request_head))
4604 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
4605 n->active_client_request_tail,
4607 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
4608 &n->peer.hashPubKey,
4613 GNUNET_STATISTICS_update (stats,
4614 gettext_noop ("# peers connected (transport)"),
4617 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
4618 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
4619 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4620 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
4621 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
4623 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
4624 &consider_free_task,
4630 * Wrapper around 'free_neighbour'; helper for 'cleaning_task'.
4633 free_neighbour_helper (void *cls,
4634 const GNUNET_HashCode *key,
4637 struct Neighbour *n = value;
4645 * Last task run during shutdown. Disconnects us from
4649 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4654 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4655 "Core service shutting down.\n");
4657 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
4658 &free_neighbour_helper,
4660 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
4662 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), 0, GNUNET_NO);
4663 GNUNET_assert (transport != NULL);
4664 GNUNET_TRANSPORT_disconnect (transport);
4666 GNUNET_SERVER_notification_context_destroy (notifier);
4668 while (NULL != (c = clients))
4669 handle_client_disconnect (NULL, c->client_handle);
4670 if (my_private_key != NULL)
4671 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4673 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4674 if (peerinfo != NULL)
4675 GNUNET_PEERINFO_disconnect (peerinfo);
4677 GNUNET_SERVER_mst_destroy (mst);
4682 * Initiate core service.
4684 * @param cls closure
4685 * @param server the initialized server
4686 * @param c configuration to use
4690 struct GNUNET_SERVER_Handle *server,
4691 const struct GNUNET_CONFIGURATION_Handle *c)
4693 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4694 {&handle_client_init, NULL,
4695 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
4696 {&handle_client_iterate_peers, NULL,
4697 GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS,
4698 sizeof (struct GNUNET_MessageHeader)},
4699 {&handle_client_have_peer, NULL,
4700 GNUNET_MESSAGE_TYPE_CORE_PEER_CONNECTED,
4701 sizeof (struct GNUNET_MessageHeader) + sizeof(struct GNUNET_PeerIdentity)},
4702 {&handle_client_request_info, NULL,
4703 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
4704 sizeof (struct RequestInfoMessage)},
4705 {&handle_client_send_request, NULL,
4706 GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST,
4707 sizeof (struct SendMessageRequest)},
4708 {&handle_client_send, NULL,
4709 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
4710 {&handle_client_request_connect, NULL,
4711 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
4712 sizeof (struct ConnectMessage)},
4718 /* parse configuration */
4721 GNUNET_CONFIGURATION_get_value_number (c,
4724 &bandwidth_target_in_bps)) ||
4726 GNUNET_CONFIGURATION_get_value_number (c,
4729 &bandwidth_target_out_bps)) ||
4731 GNUNET_CONFIGURATION_get_value_filename (c,
4733 "HOSTKEY", &keyfile)))
4735 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4737 ("Core service is lacking key configuration settings. Exiting.\n"));
4738 GNUNET_SCHEDULER_shutdown ();
4741 peerinfo = GNUNET_PEERINFO_connect (cfg);
4742 if (NULL == peerinfo)
4744 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4745 _("Could not access PEERINFO service. Exiting.\n"));
4746 GNUNET_SCHEDULER_shutdown ();
4747 GNUNET_free (keyfile);
4750 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4751 GNUNET_free (keyfile);
4752 if (my_private_key == NULL)
4754 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4755 _("Core service could not access hostkey. Exiting.\n"));
4756 GNUNET_PEERINFO_disconnect (peerinfo);
4757 GNUNET_SCHEDULER_shutdown ();
4760 neighbours = GNUNET_CONTAINER_multihashmap_create (128);
4761 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4762 GNUNET_CRYPTO_hash (&my_public_key,
4763 sizeof (my_public_key), &my_identity.hashPubKey);
4764 self.public_key = &my_public_key;
4765 self.peer = my_identity;
4766 self.last_activity = GNUNET_TIME_UNIT_FOREVER_ABS;
4767 self.status = PEER_STATE_KEY_CONFIRMED;
4768 self.is_connected = GNUNET_YES;
4769 /* setup notification */
4770 notifier = GNUNET_SERVER_notification_context_create (server,
4772 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
4773 /* setup transport connection */
4774 transport = GNUNET_TRANSPORT_connect (cfg,
4777 &handle_transport_receive,
4778 &handle_transport_notify_connect,
4779 &handle_transport_notify_disconnect);
4780 GNUNET_assert (NULL != transport);
4781 stats = GNUNET_STATISTICS_create ("core", cfg);
4783 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded CORE_SEND requests"), 0, GNUNET_NO);
4784 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 0, GNUNET_NO);
4786 mst = GNUNET_SERVER_mst_create (&deliver_message,
4788 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
4789 &cleaning_task, NULL);
4790 /* process client requests */
4791 GNUNET_SERVER_add_handlers (server, handlers);
4792 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4793 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
4799 * The main function for the transport service.
4801 * @param argc number of arguments from the command line
4802 * @param argv command line arguments
4803 * @return 0 ok, 1 on error
4806 main (int argc, char *const *argv)
4808 return (GNUNET_OK ==
4809 GNUNET_SERVICE_run (argc,
4812 GNUNET_SERVICE_OPTION_NONE,
4813 &run, NULL)) ? 0 : 1;
4816 /* end of gnunet-service-core.c */