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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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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 * Type map implementation:
27 * - track type maps for neighbours (can wait)
28 * - only notify clients about peers with matching type maps (can wait)
30 * Considerations for later:
31 * - check that hostkey used by transport (for HELLOs) is the
32 * same as the hostkey that we are using!
36 #include "gnunet_constants.h"
37 #include "gnunet_util_lib.h"
38 #include "gnunet_hello_lib.h"
39 #include "gnunet_peerinfo_service.h"
40 #include "gnunet_protocols.h"
41 #include "gnunet_signatures.h"
42 #include "gnunet_statistics_service.h"
43 #include "gnunet_transport_service.h"
47 #define DEBUG_HANDSHAKE GNUNET_EXTRA_LOGGING
49 #define DEBUG_CORE_QUOTA GNUNET_EXTRA_LOGGING
52 * Receive and send buffer windows grow over time. For
53 * how long can 'unused' bandwidth accumulate before we
54 * need to cap it? (specified in seconds).
56 #define MAX_WINDOW_TIME_S (5 * 60)
59 * How many messages do we queue up at most for optional
60 * notifications to a client? (this can cause notifications
61 * about outgoing messages to be dropped).
63 #define MAX_NOTIFY_QUEUE 1024
66 * Minimum bandwidth (out) to assign to any connected peer.
67 * Should be rather low; values larger than DEFAULT_BW_IN_OUT make no
70 #define MIN_BANDWIDTH_PER_PEER GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT
73 * After how much time past the "official" expiration time do
74 * we discard messages? Should not be zero since we may
75 * intentionally defer transmission until close to the deadline
76 * and then may be slightly past the deadline due to inaccuracy
77 * in sleep and our own CPU consumption.
79 #define PAST_EXPIRATION_DISCARD_TIME GNUNET_TIME_UNIT_SECONDS
82 * What is the maximum delay for a SET_KEY message?
84 #define MAX_SET_KEY_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
87 * How long do we wait for SET_KEY confirmation initially?
89 #define INITIAL_SET_KEY_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 1)
92 * What is the maximum delay for a PING message?
94 #define MAX_PING_DELAY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 2)
97 * What is the maximum delay for a PONG message?
99 #define MAX_PONG_DELAY GNUNET_TIME_relative_multiply (MAX_PING_DELAY, 2)
102 * What is the minimum frequency for a PING message?
104 #define MIN_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
107 * How often do we recalculate bandwidth quotas?
109 #define QUOTA_UPDATE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
112 * What is the priority for a SET_KEY message?
114 #define SET_KEY_PRIORITY 0xFFFFFF
117 * What is the priority for a PING message?
119 #define PING_PRIORITY 0xFFFFFF
122 * What is the priority for a PONG message?
124 #define PONG_PRIORITY 0xFFFFFF
127 * How many messages do we queue per peer at most? Must be at
130 #define MAX_PEER_QUEUE_SIZE 16
133 * How many non-mandatory messages do we queue per client at most?
135 #define MAX_CLIENT_QUEUE_SIZE 32
138 * What is the maximum age of a message for us to consider
139 * processing it? Note that this looks at the timestamp used
140 * by the other peer, so clock skew between machines does
141 * come into play here. So this should be picked high enough
142 * so that a little bit of clock skew does not prevent peers
143 * from connecting to us.
145 #define MAX_MESSAGE_AGE GNUNET_TIME_UNIT_DAYS
149 * State machine for our P2P encryption handshake. Everyone starts in
150 * "DOWN", if we receive the other peer's key (other peer initiated)
151 * we start in state RECEIVED (since we will immediately send our
152 * own); otherwise we start in SENT. If we get back a PONG from
153 * within either state, we move up to CONFIRMED (the PONG will always
154 * be sent back encrypted with the key we sent to the other peer).
156 enum PeerStateMachine
164 * We've sent our session key.
169 * We've received the other peers session key.
171 PEER_STATE_KEY_RECEIVED,
174 * The other peer has confirmed our session key with a message
175 * encrypted with his session key (which we got). Session is now fully up.
177 PEER_STATE_KEY_CONFIRMED
182 * Encapsulation for encrypted messages exchanged between
183 * peers. Followed by the actual encrypted data.
185 struct EncryptedMessage
188 * Message type is either CORE_ENCRYPTED_MESSAGE.
190 struct GNUNET_MessageHeader header;
193 * Random value used for IV generation.
195 uint32_t iv_seed GNUNET_PACKED;
198 * MAC of the encrypted message (starting at 'sequence_number'),
199 * used to verify message integrity. Everything after this value
200 * (excluding this value itself) will be encrypted and authenticated.
201 * ENCRYPTED_HEADER_SIZE must be set to the offset of the *next* field.
203 GNUNET_HashCode hmac;
206 * Sequence number, in network byte order. This field
207 * must be the first encrypted/decrypted field
209 uint32_t sequence_number GNUNET_PACKED;
212 * Desired bandwidth (how much we should send to this peer / how
213 * much is the sender willing to receive)?
215 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
218 * Timestamp. Used to prevent reply of ancient messages
219 * (recent messages are caught with the sequence number).
221 struct GNUNET_TIME_AbsoluteNBO timestamp;
227 * Number of bytes (at the beginning) of "struct EncryptedMessage"
228 * that are NOT encrypted.
230 #define ENCRYPTED_HEADER_SIZE (offsetof(struct EncryptedMessage, sequence_number))
234 * We're sending an (encrypted) PING to the other peer to check if he
235 * can decrypt. The other peer should respond with a PONG with the
236 * same content, except this time encrypted with the receiver's key.
241 * Message type is CORE_PING.
243 struct GNUNET_MessageHeader header;
248 uint32_t iv_seed GNUNET_PACKED;
251 * Intended target of the PING, used primarily to check
252 * that decryption actually worked.
254 struct GNUNET_PeerIdentity target;
257 * Random number chosen to make reply harder.
259 uint32_t challenge GNUNET_PACKED;
265 * Response to a PING. Includes data from the original PING
266 * plus initial bandwidth quota information.
271 * Message type is CORE_PONG.
273 struct GNUNET_MessageHeader header;
278 uint32_t iv_seed GNUNET_PACKED;
281 * Random number to make faking the reply harder. Must be
282 * first field after header (this is where we start to encrypt!).
284 uint32_t challenge GNUNET_PACKED;
287 * Desired bandwidth (how much we should send to this
288 * peer / how much is the sender willing to receive).
290 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
293 * Intended target of the PING, used primarily to check
294 * that decryption actually worked.
296 struct GNUNET_PeerIdentity target;
301 * Message transmitted to set (or update) a session key.
307 * Message type is either CORE_SET_KEY.
309 struct GNUNET_MessageHeader header;
312 * Status of the sender (should be in "enum PeerStateMachine"), nbo.
314 int32_t sender_status GNUNET_PACKED;
317 * Purpose of the signature, will be
318 * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
320 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
323 * At what time was this key created?
325 struct GNUNET_TIME_AbsoluteNBO creation_time;
328 * The encrypted session key.
330 struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
333 * Who is the intended recipient?
335 struct GNUNET_PeerIdentity target;
338 * Signature of the stuff above (starting at purpose).
340 struct GNUNET_CRYPTO_RsaSignature signature;
346 * Message waiting for transmission. This struct
347 * is followed by the actual content of the message.
353 * We keep messages in a doubly linked list.
355 struct MessageEntry *next;
358 * We keep messages in a doubly linked list.
360 struct MessageEntry *prev;
363 * By when are we supposed to transmit this message?
365 struct GNUNET_TIME_Absolute deadline;
368 * By when are we supposed to transmit this message (after
371 struct GNUNET_TIME_Absolute slack_deadline;
374 * How important is this message to us?
376 unsigned int priority;
379 * If this is a SET_KEY message, what was our connection status when this
380 * message was queued?
382 enum PeerStateMachine sender_status;
385 * Is this a SET_KEY message?
390 * How long is the message? (number of bytes following
391 * the "struct MessageEntry", but not including the
392 * size of "struct MessageEntry" itself!)
397 * Was this message selected for transmission in the
398 * current round? GNUNET_YES or GNUNET_NO.
403 * Did we give this message some slack (delayed sending) previously
404 * (and hence should not give it any more slack)? GNUNET_YES or
413 * Record kept for each request for transmission issued by a
414 * client that is still pending.
416 struct ClientActiveRequest;
419 * Data kept per neighbouring peer.
425 * Unencrypted messages destined for this peer.
427 struct MessageEntry *messages;
430 * Head of the batched, encrypted message queue (already ordered,
431 * transmit starting with the head).
433 struct MessageEntry *encrypted_head;
436 * Tail of the batched, encrypted message queue (already ordered,
437 * append new messages to tail)
439 struct MessageEntry *encrypted_tail;
442 * Head of list of requests from clients for transmission to
445 struct ClientActiveRequest *active_client_request_head;
448 * Tail of list of requests from clients for transmission to
451 struct ClientActiveRequest *active_client_request_tail;
454 * Handle for pending requests for transmission to this peer
455 * with the transport service. NULL if no request is pending.
457 struct GNUNET_TRANSPORT_TransmitHandle *th;
460 * Public key of the neighbour, NULL if we don't have it yet.
462 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
465 * We received a PING message before we got the "public_key"
466 * (or the SET_KEY). We keep it here until we have a key
467 * to decrypt it. NULL if no PING is pending.
469 struct PingMessage *pending_ping;
472 * We received a PONG message before we got the "public_key"
473 * (or the SET_KEY). We keep it here until we have a key
474 * to decrypt it. NULL if no PONG is pending.
476 struct PongMessage *pending_pong;
479 * Non-NULL if we are currently looking up HELLOs for this peer.
482 struct GNUNET_PEERINFO_IteratorContext *pitr;
485 * SetKeyMessage to transmit, NULL if we are not currently trying
488 struct SetKeyMessage *skm;
491 * Performance data for the peer.
493 struct GNUNET_TRANSPORT_ATS_Information *ats;
496 * Identity of the neighbour.
498 struct GNUNET_PeerIdentity peer;
501 * Key we use to encrypt our messages for the other peer
502 * (initialized by us when we do the handshake).
504 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
507 * Key we use to decrypt messages from the other peer
508 * (given to us by the other peer during the handshake).
510 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
513 * ID of task used for re-trying plaintext scheduling.
515 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
518 * ID of task used for re-trying SET_KEY and PING message.
520 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
523 * ID of task used for updating bandwidth quota for this neighbour.
525 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
528 * ID of task used for sending keep-alive pings.
530 GNUNET_SCHEDULER_TaskIdentifier keep_alive_task;
533 * ID of task used for cleaning up dead neighbour entries.
535 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
538 * At what time did we generate our encryption key?
540 struct GNUNET_TIME_Absolute encrypt_key_created;
543 * At what time did the other peer generate the decryption key?
545 struct GNUNET_TIME_Absolute decrypt_key_created;
548 * At what time did we initially establish (as in, complete session
549 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
551 struct GNUNET_TIME_Absolute time_established;
554 * At what time did we last receive an encrypted message from the
555 * other peer? Should be zero if status != KEY_CONFIRMED.
557 struct GNUNET_TIME_Absolute last_activity;
560 * At what frequency are we currently re-trying SET_KEY messages?
562 struct GNUNET_TIME_Relative set_key_retry_frequency;
565 * Tracking bandwidth for sending to this peer.
567 struct GNUNET_BANDWIDTH_Tracker available_send_window;
570 * Tracking bandwidth for receiving from this peer.
572 struct GNUNET_BANDWIDTH_Tracker available_recv_window;
575 * How valueable were the messages of this peer recently?
577 unsigned long long current_preference;
580 * Number of entries in 'ats'.
582 unsigned int ats_count;
585 * Bit map indicating which of the 32 sequence numbers before the last
586 * were received (good for accepting out-of-order packets and
587 * estimating reliability of the connection)
589 unsigned int last_packets_bitmap;
592 * last sequence number received on this connection (highest)
594 uint32_t last_sequence_number_received;
597 * last sequence number transmitted
599 uint32_t last_sequence_number_sent;
602 * Available bandwidth in for this peer (current target).
604 struct GNUNET_BANDWIDTH_Value32NBO bw_in;
607 * Available bandwidth out for this peer (current target).
609 struct GNUNET_BANDWIDTH_Value32NBO bw_out;
612 * Internal bandwidth limit set for this peer (initially typically
613 * set to "-1"). Actual "bw_out" is MIN of
614 * "bpm_out_internal_limit" and "bw_out_external_limit".
616 struct GNUNET_BANDWIDTH_Value32NBO bw_out_internal_limit;
619 * External bandwidth limit set for this peer by the
620 * peer that we are communicating with. "bw_out" is MIN of
621 * "bw_out_internal_limit" and "bw_out_external_limit".
623 struct GNUNET_BANDWIDTH_Value32NBO bw_out_external_limit;
626 * What was our PING challenge number (for this peer)?
628 uint32_t ping_challenge;
631 * What is our connection status?
633 enum PeerStateMachine status;
636 * Are we currently connected to this neighbour?
644 * Data structure for each client connected to the core service.
649 * Clients are kept in a linked list.
654 * Handle for the client with the server API.
656 struct GNUNET_SERVER_Client *client_handle;
659 * Array of the types of messages this peer cares
660 * about (with "tcnt" entries). Allocated as part
661 * of this client struct, do not free!
663 const uint16_t *types;
666 * Map of peer identities to active transmission requests of this
667 * client to the peer (of type 'struct ClientActiveRequest').
669 struct GNUNET_CONTAINER_MultiHashMap *requests;
672 * Options for messages this client cares about,
673 * see GNUNET_CORE_OPTION_ values.
678 * Number of types of incoming messages this client
679 * specifically cares about. Size of the "types" array.
687 * Record kept for each request for transmission issued by a
688 * client that is still pending.
690 struct ClientActiveRequest
694 * Active requests are kept in a doubly-linked list of
695 * the respective target peer.
697 struct ClientActiveRequest *next;
700 * Active requests are kept in a doubly-linked list of
701 * the respective target peer.
703 struct ClientActiveRequest *prev;
706 * Handle to the client.
708 struct Client *client;
711 * By what time would the client want to see this message out?
713 struct GNUNET_TIME_Absolute deadline;
716 * How important is this request.
721 * How many more requests does this client have?
726 * How many bytes does the client intend to send?
731 * Unique request ID (in big endian).
742 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
747 static struct GNUNET_PeerIdentity my_identity;
752 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
755 * Bitmap of message types this peer is able to handle.
757 static uint32_t my_type_map[(UINT16_MAX + 1) / 32];
760 * Handle to peerinfo service.
762 static struct GNUNET_PEERINFO_Handle *peerinfo;
765 * Our message stream tokenizer (for encrypted payload).
767 static struct GNUNET_SERVER_MessageStreamTokenizer *mst;
772 const struct GNUNET_CONFIGURATION_Handle *cfg;
777 static struct GNUNET_TRANSPORT_Handle *transport;
780 * Linked list of our clients.
782 static struct Client *clients;
785 * Context for notifications we need to send to our clients.
787 static struct GNUNET_SERVER_NotificationContext *notifier;
790 * Map of peer identities to 'struct Neighbour'.
792 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
795 * Neighbour entry for "this" peer.
797 static struct Neighbour self;
800 * For creating statistics.
802 static struct GNUNET_STATISTICS_Handle *stats;
805 * Sum of all preferences among all neighbours.
807 static unsigned long long preference_sum;
810 * How much inbound bandwidth are we supposed to be using per second?
812 static unsigned long long bandwidth_target_in_bps;
815 * How much outbound bandwidth are we supposed to be using per second?
817 static unsigned long long bandwidth_target_out_bps;
820 * Derive an authentication key from "set key" information
823 derive_auth_key (struct GNUNET_CRYPTO_AuthKey *akey,
824 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
825 struct GNUNET_TIME_Absolute creation_time)
827 static const char ctx[] = "authentication key";
828 struct GNUNET_TIME_AbsoluteNBO ctbe;
831 ctbe = GNUNET_TIME_absolute_hton (creation_time);
832 GNUNET_CRYPTO_hmac_derive_key (akey, skey, &seed, sizeof (seed), &skey->key,
833 sizeof (skey->key), &ctbe, sizeof (ctbe), ctx,
839 * Derive an IV from packet information
842 derive_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
843 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
844 const struct GNUNET_PeerIdentity *identity)
846 static const char ctx[] = "initialization vector";
848 GNUNET_CRYPTO_aes_derive_iv (iv, skey, &seed, sizeof (seed),
849 &identity->hashPubKey.bits,
850 sizeof (identity->hashPubKey.bits), ctx,
855 * Derive an IV from pong packet information
858 derive_pong_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
859 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
860 uint32_t challenge, const struct GNUNET_PeerIdentity *identity)
862 static const char ctx[] = "pong initialization vector";
864 GNUNET_CRYPTO_aes_derive_iv (iv, skey, &seed, sizeof (seed),
865 &identity->hashPubKey.bits,
866 sizeof (identity->hashPubKey.bits), &challenge,
867 sizeof (challenge), ctx, sizeof (ctx), NULL);
872 * At what time should the connection to the given neighbour
873 * time out (given no further activity?)
875 * @param n neighbour in question
876 * @return absolute timeout
878 static struct GNUNET_TIME_Absolute
879 get_neighbour_timeout (struct Neighbour *n)
881 return GNUNET_TIME_absolute_add (n->last_activity,
882 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
887 * Helper function for update_preference_sum.
890 update_preference (void *cls, const GNUNET_HashCode * key, void *value)
892 unsigned long long *ps = cls;
893 struct Neighbour *n = value;
895 n->current_preference /= 2;
896 *ps += n->current_preference;
902 * A preference value for a neighbour was update. Update
903 * the preference sum accordingly.
905 * @param inc how much was a preference value increased?
908 update_preference_sum (unsigned long long inc)
910 unsigned long long os;
913 preference_sum += inc;
914 if (preference_sum >= os)
916 /* overflow! compensate by cutting all values in half! */
918 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &update_preference,
920 GNUNET_STATISTICS_set (stats, gettext_noop ("# total peer preference"),
921 preference_sum, GNUNET_NO);
926 * Find the entry for the given neighbour.
928 * @param peer identity of the neighbour
929 * @return NULL if we are not connected, otherwise the
932 static struct Neighbour *
933 find_neighbour (const struct GNUNET_PeerIdentity *peer)
935 return GNUNET_CONTAINER_multihashmap_get (neighbours, &peer->hashPubKey);
940 * Send a message to one of our clients.
942 * @param client target for the message
943 * @param msg message to transmit
944 * @param can_drop could this message be dropped if the
945 * client's queue is getting too large?
948 send_to_client (struct Client *client, const struct GNUNET_MessageHeader *msg,
951 #if DEBUG_CORE_CLIENT
952 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
953 "Preparing to send %u bytes of message of type %u to client.\n",
954 (unsigned int) ntohs (msg->size),
955 (unsigned int) ntohs (msg->type));
957 GNUNET_SERVER_notification_context_unicast (notifier, client->client_handle,
963 * Send a message to all of our current clients that have
964 * the right options set.
966 * @param msg message to multicast
967 * @param can_drop can this message be discarded if the queue is too long
968 * @param options mask to use
971 send_to_all_clients (const struct GNUNET_MessageHeader *msg, int can_drop,
979 if (0 != (c->options & options))
981 #if DEBUG_CORE_CLIENT > 1
982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
983 "Sending message of type %u to client.\n",
984 (unsigned int) ntohs (msg->type));
986 send_to_client (c, msg, can_drop);
994 * Function called by transport telling us that a peer
997 * @param n the peer that changed status
1000 handle_peer_status_change (struct Neighbour *n)
1002 struct PeerStatusNotifyMessage *psnm;
1003 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1004 struct GNUNET_TRANSPORT_ATS_Information *ats;
1007 if ((!n->is_connected) || (n->status != PEER_STATE_KEY_CONFIRMED))
1010 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer `%4s' changed status\n",
1011 GNUNET_i2s (&n->peer));
1014 sizeof (struct PeerStatusNotifyMessage) +
1015 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1016 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1019 /* recovery strategy: throw away performance data */
1020 GNUNET_array_grow (n->ats, n->ats_count, 0);
1022 sizeof (struct PeerStatusNotifyMessage) +
1023 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1025 psnm = (struct PeerStatusNotifyMessage *) buf;
1026 psnm->header.size = htons (size);
1027 psnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE);
1028 psnm->timeout = GNUNET_TIME_absolute_hton (get_neighbour_timeout (n));
1029 psnm->bandwidth_in = n->bw_in;
1030 psnm->bandwidth_out = n->bw_out;
1031 psnm->peer = n->peer;
1032 psnm->ats_count = htonl (n->ats_count);
1034 memcpy (ats, n->ats,
1035 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
1036 ats[n->ats_count].type = htonl (0);
1037 ats[n->ats_count].value = htonl (0);
1038 send_to_all_clients (&psnm->header, GNUNET_YES,
1039 GNUNET_CORE_OPTION_SEND_STATUS_CHANGE);
1040 GNUNET_STATISTICS_update (stats, gettext_noop ("# peer status changes"), 1,
1046 * Go over our message queue and if it is not too long, go
1047 * over the pending requests from clients for this
1048 * neighbour and send some clients a 'READY' notification.
1050 * @param n which peer to process
1053 schedule_peer_messages (struct Neighbour *n)
1055 struct SendMessageReady smr;
1056 struct ClientActiveRequest *car;
1057 struct ClientActiveRequest *pos;
1059 struct MessageEntry *mqe;
1060 unsigned int queue_size;
1062 /* check if neighbour queue is empty enough! */
1072 if (queue_size >= MAX_PEER_QUEUE_SIZE)
1074 #if DEBUG_CORE_CLIENT
1075 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1076 "Not considering client transmission requests: queue full\n");
1078 return; /* queue still full */
1080 /* find highest priority request */
1081 pos = n->active_client_request_head;
1085 if ((car == NULL) || (pos->priority > car->priority))
1092 car = n->active_client_request_head;
1095 return; /* no pending requests */
1096 #if DEBUG_CORE_CLIENT
1097 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1098 "Permitting client transmission request to `%s'\n",
1099 GNUNET_i2s (&n->peer));
1102 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1103 n->active_client_request_tail, car);
1104 GNUNET_assert (GNUNET_YES ==
1105 GNUNET_CONTAINER_multihashmap_remove (c->requests,
1106 &n->peer.hashPubKey,
1108 smr.header.size = htons (sizeof (struct SendMessageReady));
1109 smr.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_READY);
1110 smr.size = htons (car->msize);
1111 smr.smr_id = car->smr_id;
1113 send_to_client (c, &smr.header, GNUNET_NO);
1119 * Compute a type map message for this peer.
1121 * @return this peers current type map message.
1123 static struct GNUNET_MessageHeader *
1124 compute_type_map_message ()
1128 struct GNUNET_MessageHeader *hdr;
1130 #ifdef compressBound
1131 dlen = compressBound (sizeof (my_type_map));
1133 dlen = sizeof (my_type_map) + (sizeof (my_type_map) / 100) + 20;
1134 /* documentation says 100.1% oldSize + 12 bytes, but we
1135 * should be able to overshoot by more to be safe */
1137 hdr = GNUNET_malloc (dlen + sizeof (struct GNUNET_MessageHeader));
1138 hdr->size = htons ((uint16_t) dlen + sizeof (struct GNUNET_MessageHeader));
1139 tmp = (char *) &hdr[1];
1141 compress2 ((Bytef *) tmp, &dlen, (const Bytef *) my_type_map,
1142 sizeof (my_type_map), 9)) || (dlen >= sizeof (my_type_map)))
1144 dlen = sizeof (my_type_map);
1145 memcpy (tmp, my_type_map, sizeof (my_type_map));
1146 hdr->type = htons (GNUNET_MESSAGE_TYPE_CORE_BINARY_TYPE_MAP);
1150 hdr->type = htons (GNUNET_MESSAGE_TYPE_CORE_COMPRESSED_TYPE_MAP);
1157 * Send a type map message to the neighbour.
1159 * @param cls the type map message
1160 * @param key neighbour's identity
1161 * @param value 'struct Neighbour' of the target
1162 * @return always GNUNET_OK
1165 send_type_map_to_neighbour (void *cls, const GNUNET_HashCode * key, void *value)
1167 struct GNUNET_MessageHeader *hdr = cls;
1168 struct Neighbour *n = value;
1169 struct MessageEntry *m;
1174 size = ntohs (hdr->size);
1175 m = GNUNET_malloc (sizeof (struct MessageEntry) + size);
1176 memcpy (&m[1], hdr, size);
1177 m->deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1178 m->slack_deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1179 m->priority = UINT_MAX;
1180 m->sender_status = n->status;
1182 m->next = n->messages;
1190 * Send my type map to all connected peers (it got changed).
1193 broadcast_my_type_map ()
1195 struct GNUNET_MessageHeader *hdr;
1197 if (NULL == neighbours)
1199 hdr = compute_type_map_message ();
1200 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
1201 &send_type_map_to_neighbour, hdr);
1207 * Handle CORE_SEND_REQUEST message.
1210 handle_client_send_request (void *cls, struct GNUNET_SERVER_Client *client,
1211 const struct GNUNET_MessageHeader *message)
1213 const struct SendMessageRequest *req;
1214 struct Neighbour *n;
1216 struct ClientActiveRequest *car;
1218 req = (const struct SendMessageRequest *) message;
1220 memcmp (&req->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
1223 n = find_neighbour (&req->peer);
1224 if ((n == NULL) || (GNUNET_YES != n->is_connected) ||
1225 (n->status != PEER_STATE_KEY_CONFIRMED))
1227 /* neighbour must have disconnected since request was issued,
1228 * ignore (client will realize it once it processes the
1229 * disconnect notification) */
1230 #if DEBUG_CORE_CLIENT
1231 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1232 "Dropped client request for transmission (am disconnected)\n");
1234 GNUNET_STATISTICS_update (stats,
1236 ("# send requests dropped (disconnected)"), 1,
1238 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1242 while ((c != NULL) && (c->client_handle != client))
1246 /* client did not send INIT first! */
1248 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1251 if (c->requests == NULL)
1252 c->requests = GNUNET_CONTAINER_multihashmap_create (16);
1253 #if DEBUG_CORE_CLIENT
1254 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1255 "Received client transmission request. queueing\n");
1257 car = GNUNET_CONTAINER_multihashmap_get (c->requests, &req->peer.hashPubKey);
1260 /* create new entry */
1261 car = GNUNET_malloc (sizeof (struct ClientActiveRequest));
1262 GNUNET_assert (GNUNET_OK ==
1263 GNUNET_CONTAINER_multihashmap_put (c->requests,
1264 &req->peer.hashPubKey,
1266 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
1267 GNUNET_CONTAINER_DLL_insert (n->active_client_request_head,
1268 n->active_client_request_tail, car);
1271 car->deadline = GNUNET_TIME_absolute_ntoh (req->deadline);
1272 car->priority = ntohl (req->priority);
1273 car->queue_size = ntohl (req->queue_size);
1274 car->msize = ntohs (req->size);
1275 car->smr_id = req->smr_id;
1276 schedule_peer_messages (n);
1277 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1282 * Notify client about an existing connection to one of our neighbours.
1285 notify_client_about_neighbour (void *cls, const GNUNET_HashCode * key,
1288 struct Client *c = cls;
1289 struct Neighbour *n = value;
1291 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1292 struct GNUNET_TRANSPORT_ATS_Information *ats;
1293 struct ConnectNotifyMessage *cnm;
1296 sizeof (struct ConnectNotifyMessage) +
1297 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1298 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1301 /* recovery strategy: throw away performance data */
1302 GNUNET_array_grow (n->ats, n->ats_count, 0);
1304 sizeof (struct ConnectNotifyMessage) +
1305 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1307 cnm = (struct ConnectNotifyMessage *) buf;
1308 cnm->header.size = htons (size);
1309 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1310 cnm->ats_count = htonl (n->ats_count);
1312 memcpy (ats, n->ats,
1313 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * n->ats_count);
1314 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1315 ats[n->ats_count].value = htonl (0);
1316 if (n->status == PEER_STATE_KEY_CONFIRMED)
1318 #if DEBUG_CORE_CLIENT
1319 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message to client.\n",
1322 cnm->peer = n->peer;
1323 send_to_client (c, &cnm->header, GNUNET_NO);
1331 * Handle CORE_INIT request.
1334 handle_client_init (void *cls, struct GNUNET_SERVER_Client *client,
1335 const struct GNUNET_MessageHeader *message)
1337 const struct InitMessage *im;
1338 struct InitReplyMessage irm;
1341 const uint16_t *types;
1345 #if DEBUG_CORE_CLIENT
1346 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1347 "Client connecting to core service with `%s' message\n", "INIT");
1349 /* check that we don't have an entry already */
1353 if (client == c->client_handle)
1356 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1361 msize = ntohs (message->size);
1362 if (msize < sizeof (struct InitMessage))
1365 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1368 GNUNET_SERVER_notification_context_add (notifier, client);
1369 im = (const struct InitMessage *) message;
1370 types = (const uint16_t *) &im[1];
1371 msize -= sizeof (struct InitMessage);
1372 c = GNUNET_malloc (sizeof (struct Client) + msize);
1373 c->client_handle = client;
1376 c->tcnt = msize / sizeof (uint16_t);
1377 c->types = (const uint16_t *) &c[1];
1378 wtypes = (uint16_t *) & c[1];
1379 for (i = 0; i < c->tcnt; i++)
1381 wtypes[i] = ntohs (types[i]);
1382 my_type_map[wtypes[i] / 32] |= (1 << (wtypes[i] % 32));
1385 broadcast_my_type_map ();
1386 c->options = ntohl (im->options);
1387 #if DEBUG_CORE_CLIENT
1388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1389 "Client %p is interested in %u message types\n", c,
1390 (unsigned int) c->tcnt);
1392 /* send init reply message */
1393 irm.header.size = htons (sizeof (struct InitReplyMessage));
1394 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
1395 irm.reserved = htonl (0);
1396 memcpy (&irm.publicKey, &my_public_key,
1397 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1398 #if DEBUG_CORE_CLIENT
1399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message to client.\n",
1402 send_to_client (c, &irm.header, GNUNET_NO);
1403 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
1405 /* notify new client about existing neighbours */
1406 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
1407 ¬ify_client_about_neighbour, c);
1409 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1414 * Free client request records.
1417 * @param key identity of peer for which this is an active request
1418 * @param value the 'struct ClientActiveRequest' to free
1419 * @return GNUNET_YES (continue iteration)
1422 destroy_active_client_request (void *cls, const GNUNET_HashCode * key,
1425 struct ClientActiveRequest *car = value;
1426 struct Neighbour *n;
1427 struct GNUNET_PeerIdentity peer;
1429 peer.hashPubKey = *key;
1430 n = find_neighbour (&peer);
1431 GNUNET_assert (NULL != n);
1432 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1433 n->active_client_request_tail, car);
1440 * A client disconnected, clean up.
1442 * @param cls closure
1443 * @param client identification of the client
1446 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
1449 struct Client *prev;
1451 const uint16_t *wtypes;
1455 #if DEBUG_CORE_CLIENT
1456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1457 "Client %p has disconnected from core service.\n", client);
1463 if (client == pos->client_handle)
1470 /* client never sent INIT */
1474 clients = pos->next;
1476 prev->next = pos->next;
1477 if (pos->requests != NULL)
1479 GNUNET_CONTAINER_multihashmap_iterate (pos->requests,
1480 &destroy_active_client_request,
1482 GNUNET_CONTAINER_multihashmap_destroy (pos->requests);
1486 /* rebuild my_type_map */
1487 memset (my_type_map, 0, sizeof (my_type_map));
1488 for (pos = clients; NULL != pos; pos = pos->next)
1490 wtypes = (const uint16_t *) &pos[1];
1491 for (i = 0; i < pos->tcnt; i++)
1492 my_type_map[wtypes[i] / 32] |= (1 << (wtypes[i] % 32));
1494 broadcast_my_type_map ();
1499 * Helper function for handle_client_iterate_peers.
1501 * @param cls the 'struct GNUNET_SERVER_TransmitContext' to queue replies
1502 * @param key identity of the connected peer
1503 * @param value the 'struct Neighbour' for the peer
1504 * @return GNUNET_OK (continue to iterate)
1507 queue_connect_message (void *cls, const GNUNET_HashCode * key, void *value)
1509 struct GNUNET_SERVER_TransmitContext *tc = cls;
1510 struct Neighbour *n = value;
1511 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1512 struct GNUNET_TRANSPORT_ATS_Information *ats;
1514 struct ConnectNotifyMessage *cnm;
1516 cnm = (struct ConnectNotifyMessage *) buf;
1517 if (n->status != PEER_STATE_KEY_CONFIRMED)
1520 sizeof (struct ConnectNotifyMessage) +
1521 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1522 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1525 /* recovery strategy: throw away performance data */
1526 GNUNET_array_grow (n->ats, n->ats_count, 0);
1528 sizeof (struct PeerStatusNotifyMessage) +
1529 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1531 cnm = (struct ConnectNotifyMessage *) buf;
1532 cnm->header.size = htons (size);
1533 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1534 cnm->ats_count = htonl (n->ats_count);
1536 memcpy (ats, n->ats,
1537 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
1538 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1539 ats[n->ats_count].value = htonl (0);
1540 #if DEBUG_CORE_CLIENT
1541 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message to client.\n",
1544 cnm->peer = n->peer;
1545 GNUNET_SERVER_transmit_context_append_message (tc, &cnm->header);
1551 * Handle CORE_ITERATE_PEERS request.
1554 * @param client client sending the iteration request
1555 * @param message iteration request message
1558 handle_client_iterate_peers (void *cls, struct GNUNET_SERVER_Client *client,
1559 const struct GNUNET_MessageHeader *message)
1561 struct GNUNET_MessageHeader done_msg;
1562 struct GNUNET_SERVER_TransmitContext *tc;
1565 /* notify new client about existing neighbours */
1567 msize = ntohs (message->size);
1568 tc = GNUNET_SERVER_transmit_context_create (client);
1569 if (msize == sizeof (struct GNUNET_MessageHeader))
1570 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &queue_connect_message,
1575 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1576 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
1577 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
1578 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
1583 * Handle CORE_PEER_CONNECTED request. Notify client about existing neighbours.
1586 * @param client client sending the iteration request
1587 * @param message iteration request message
1590 handle_client_have_peer (void *cls, struct GNUNET_SERVER_Client *client,
1591 const struct GNUNET_MessageHeader *message)
1593 struct GNUNET_MessageHeader done_msg;
1594 struct GNUNET_SERVER_TransmitContext *tc;
1595 struct GNUNET_PeerIdentity *peer;
1597 tc = GNUNET_SERVER_transmit_context_create (client);
1598 peer = (struct GNUNET_PeerIdentity *) &message[1];
1599 GNUNET_CONTAINER_multihashmap_get_multiple (neighbours, &peer->hashPubKey,
1600 &queue_connect_message, tc);
1601 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1602 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
1603 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
1604 GNUNET_SERVER_transmit_context_run (tc, GNUNET_TIME_UNIT_FOREVER_REL);
1609 * Handle REQUEST_INFO request.
1612 * @param client client sending the request
1613 * @param message iteration request message
1616 handle_client_request_info (void *cls, struct GNUNET_SERVER_Client *client,
1617 const struct GNUNET_MessageHeader *message)
1619 const struct RequestInfoMessage *rcm;
1621 struct Neighbour *n;
1622 struct ConfigurationInfoMessage cim;
1623 int32_t want_reserv;
1625 unsigned long long old_preference;
1626 struct GNUNET_TIME_Relative rdelay;
1628 rdelay = GNUNET_TIME_relative_get_zero ();
1629 #if DEBUG_CORE_CLIENT
1630 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core service receives `%s' request.\n",
1636 if (client == pos->client_handle)
1643 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1647 rcm = (const struct RequestInfoMessage *) message;
1648 n = find_neighbour (&rcm->peer);
1649 memset (&cim, 0, sizeof (cim));
1650 if ((n != NULL) && (GNUNET_YES == n->is_connected))
1652 want_reserv = ntohl (rcm->reserve_inbound);
1653 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1655 n->bw_out_internal_limit = rcm->limit_outbound;
1656 if (n->bw_out.value__ !=
1657 GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1658 n->bw_out_external_limit).value__)
1661 GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1662 n->bw_out_external_limit);
1663 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1665 GNUNET_TRANSPORT_set_quota (transport, &n->peer, n->bw_in, n->bw_out);
1666 handle_peer_status_change (n);
1669 if (want_reserv < 0)
1671 got_reserv = want_reserv;
1673 else if (want_reserv > 0)
1676 GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1678 if (rdelay.rel_value == 0)
1679 got_reserv = want_reserv;
1681 got_reserv = 0; /* all or nothing */
1685 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window, got_reserv);
1686 old_preference = n->current_preference;
1687 n->current_preference += GNUNET_ntohll (rcm->preference_change);
1688 if (old_preference > n->current_preference)
1690 /* overflow; cap at maximum value */
1691 n->current_preference = ULLONG_MAX;
1693 update_preference_sum (n->current_preference - old_preference);
1694 #if DEBUG_CORE_QUOTA
1695 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1696 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes, suggesting delay of %llu ms\n",
1697 (int) want_reserv, GNUNET_i2s (&rcm->peer), (int) got_reserv,
1698 (unsigned long long) rdelay.rel_value);
1700 cim.reserved_amount = htonl (got_reserv);
1701 cim.reserve_delay = GNUNET_TIME_relative_hton (rdelay);
1702 cim.bw_out = n->bw_out;
1703 cim.preference = n->current_preference;
1707 /* Technically, this COULD happen (due to asynchronous behavior),
1708 * but it should be rare, so we should generate an info event
1709 * to help diagnosis of serious errors that might be masked by this */
1710 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1712 ("Client asked for preference change with peer `%s', which is not connected!\n"),
1713 GNUNET_i2s (&rcm->peer));
1714 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1717 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1718 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1719 cim.peer = rcm->peer;
1720 cim.rim_id = rcm->rim_id;
1721 #if DEBUG_CORE_CLIENT
1722 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message to client.\n",
1723 "CONFIGURATION_INFO");
1725 send_to_client (pos, &cim.header, GNUNET_NO);
1726 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1731 * Free the given entry for the neighbour (it has
1732 * already been removed from the list at this point).
1734 * @param n neighbour to free
1737 free_neighbour (struct Neighbour *n)
1739 struct MessageEntry *m;
1740 struct ClientActiveRequest *car;
1743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1744 "Destroying neighbour entry for peer `%4s'\n",
1745 GNUNET_i2s (&n->peer));
1747 if (n->pitr != NULL)
1749 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1754 GNUNET_free (n->skm);
1757 while (NULL != (m = n->messages))
1759 n->messages = m->next;
1762 while (NULL != (m = n->encrypted_head))
1764 GNUNET_CONTAINER_DLL_remove (n->encrypted_head, n->encrypted_tail, m);
1767 while (NULL != (car = n->active_client_request_head))
1769 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1770 n->active_client_request_tail, car);
1771 GNUNET_assert (GNUNET_YES ==
1772 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
1773 &n->peer.hashPubKey,
1779 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1782 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1783 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
1784 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1785 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
1786 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1787 GNUNET_SCHEDULER_cancel (n->quota_update_task);
1788 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1789 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1790 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1791 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
1792 if (n->status == PEER_STATE_KEY_CONFIRMED)
1793 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"),
1795 GNUNET_array_grow (n->ats, n->ats_count, 0);
1796 GNUNET_free_non_null (n->public_key);
1797 GNUNET_free_non_null (n->pending_ping);
1798 GNUNET_free_non_null (n->pending_pong);
1804 * Check if we have encrypted messages for the specified neighbour
1805 * pending, and if so, check with the transport about sending them
1808 * @param n neighbour to check.
1811 process_encrypted_neighbour_queue (struct Neighbour *n);
1815 * Encrypt size bytes from in and write the result to out. Use the
1816 * key for outbound traffic of the given neighbour.
1818 * @param n neighbour we are sending to
1819 * @param iv initialization vector to use
1820 * @param in ciphertext
1821 * @param out plaintext
1822 * @param size size of in/out
1823 * @return GNUNET_OK on success
1826 do_encrypt (struct Neighbour *n,
1827 const struct GNUNET_CRYPTO_AesInitializationVector *iv,
1828 const void *in, void *out, size_t size)
1830 if (size != (uint16_t) size)
1835 GNUNET_assert (size ==
1836 GNUNET_CRYPTO_aes_encrypt (in, (uint16_t) size,
1837 &n->encrypt_key, iv, out));
1838 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size,
1841 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1842 "Encrypted %u bytes for `%4s' using key %u, IV %u\n",
1843 (unsigned int) size, GNUNET_i2s (&n->peer),
1844 (unsigned int) n->encrypt_key.crc32, GNUNET_CRYPTO_crc32_n (iv,
1853 * Consider freeing the given neighbour since we may not need
1854 * to keep it around anymore.
1856 * @param n neighbour to consider discarding
1859 consider_free_neighbour (struct Neighbour *n);
1863 * Task triggered when a neighbour entry is about to time out
1864 * (and we should prevent this by sending a PING).
1866 * @param cls the 'struct Neighbour'
1867 * @param tc scheduler context (not used)
1870 send_keep_alive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1872 struct Neighbour *n = cls;
1873 struct GNUNET_TIME_Relative retry;
1874 struct GNUNET_TIME_Relative left;
1875 struct MessageEntry *me;
1876 struct PingMessage pp;
1877 struct PingMessage *pm;
1878 struct GNUNET_CRYPTO_AesInitializationVector iv;
1880 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1882 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1883 sizeof (struct PingMessage));
1884 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1885 me->priority = PING_PRIORITY;
1886 me->size = sizeof (struct PingMessage);
1887 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head, n->encrypted_tail,
1888 n->encrypted_tail, me);
1889 pm = (struct PingMessage *) &me[1];
1890 pm->header.size = htons (sizeof (struct PingMessage));
1891 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1893 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1894 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
1895 pp.challenge = n->ping_challenge;
1896 pp.target = n->peer;
1898 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1899 "Encrypting `%s' message with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
1900 "PING", (unsigned int) n->ping_challenge, GNUNET_i2s (&n->peer),
1901 (unsigned int) n->encrypt_key.crc32, GNUNET_CRYPTO_crc32_n (&iv,
1906 do_encrypt (n, &iv, &pp.target, &pm->target,
1907 sizeof (struct PingMessage) - ((void *) &pm->target -
1909 process_encrypted_neighbour_queue (n);
1910 /* reschedule PING job */
1911 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1913 GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1914 MIN_PING_FREQUENCY);
1915 n->keep_alive_task =
1916 GNUNET_SCHEDULER_add_delayed (retry, &send_keep_alive, n);
1922 * Task triggered when a neighbour entry might have gotten stale.
1924 * @param cls the 'struct Neighbour'
1925 * @param tc scheduler context (not used)
1928 consider_free_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1930 struct Neighbour *n = cls;
1932 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1933 consider_free_neighbour (n);
1938 * Consider freeing the given neighbour since we may not need
1939 * to keep it around anymore.
1941 * @param n neighbour to consider discarding
1944 consider_free_neighbour (struct Neighbour *n)
1946 struct GNUNET_TIME_Relative left;
1948 if ((n->th != NULL) || (n->pitr != NULL) || (GNUNET_YES == n->is_connected))
1949 return; /* no chance */
1951 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1952 if (left.rel_value > 0)
1954 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1955 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1956 n->dead_clean_task =
1957 GNUNET_SCHEDULER_add_delayed (left, &consider_free_task, n);
1960 /* actually free the neighbour... */
1961 GNUNET_assert (GNUNET_YES ==
1962 GNUNET_CONTAINER_multihashmap_remove (neighbours,
1963 &n->peer.hashPubKey, n));
1964 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
1965 GNUNET_CONTAINER_multihashmap_size (neighbours),
1972 * Function called when the transport service is ready to
1973 * receive an encrypted message for the respective peer
1975 * @param cls neighbour to use message from
1976 * @param size number of bytes we can transmit
1977 * @param buf where to copy the message
1978 * @return number of bytes transmitted
1981 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1983 struct Neighbour *n = cls;
1984 struct MessageEntry *m;
1989 m = n->encrypted_head;
1993 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1994 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1995 GNUNET_i2s (&n->peer));
1999 GNUNET_CONTAINER_DLL_remove (n->encrypted_head, n->encrypted_tail, m);
2004 GNUNET_assert (size >= m->size);
2005 memcpy (cbuf, &m[1], m->size);
2007 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window, m->size);
2009 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2010 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
2012 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
2013 (unsigned int) ret, GNUNET_i2s (&n->peer));
2015 process_encrypted_neighbour_queue (n);
2020 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2021 "Transmission of message of type %u and size %u failed\n",
2023 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
2024 (unsigned int) m->size);
2028 consider_free_neighbour (n);
2029 GNUNET_STATISTICS_update (stats,
2031 ("# encrypted bytes given to transport"), ret,
2038 * Check if we have plaintext messages for the specified neighbour
2039 * pending, and if so, consider batching and encrypting them (and
2040 * then trigger processing of the encrypted queue if needed).
2042 * @param n neighbour to check.
2045 process_plaintext_neighbour_queue (struct Neighbour *n);
2049 * Check if we have encrypted messages for the specified neighbour
2050 * pending, and if so, check with the transport about sending them
2053 * @param n neighbour to check.
2056 process_encrypted_neighbour_queue (struct Neighbour *n)
2058 struct MessageEntry *m;
2061 return; /* request already pending */
2062 if (GNUNET_YES != n->is_connected)
2067 m = n->encrypted_head;
2070 /* encrypted queue empty, try plaintext instead */
2071 process_plaintext_neighbour_queue (n);
2075 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2076 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
2077 (unsigned int) m->size, GNUNET_i2s (&n->peer),
2078 (unsigned long long)
2079 GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
2082 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer, m->size,
2084 GNUNET_TIME_absolute_get_remaining
2086 ¬ify_encrypted_transmit_ready,
2090 /* message request too large or duplicate request */
2092 /* discard encrypted message */
2093 GNUNET_CONTAINER_DLL_remove (n->encrypted_head, n->encrypted_tail, m);
2095 process_encrypted_neighbour_queue (n);
2101 * Decrypt size bytes from in and write the result to out. Use the
2102 * key for inbound traffic of the given neighbour. This function does
2103 * NOT do any integrity-checks on the result.
2105 * @param n neighbour we are receiving from
2106 * @param iv initialization vector to use
2107 * @param in ciphertext
2108 * @param out plaintext
2109 * @param size size of in/out
2110 * @return GNUNET_OK on success
2113 do_decrypt (struct Neighbour *n,
2114 const struct GNUNET_CRYPTO_AesInitializationVector *iv,
2115 const void *in, void *out, size_t size)
2117 if (size != (uint16_t) size)
2122 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
2123 (n->status != PEER_STATE_KEY_CONFIRMED))
2125 GNUNET_break_op (0);
2126 return GNUNET_SYSERR;
2129 GNUNET_CRYPTO_aes_decrypt (in, (uint16_t) size, &n->decrypt_key, iv, out))
2132 return GNUNET_SYSERR;
2134 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes decrypted"), size,
2137 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2138 "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
2139 (unsigned int) size, GNUNET_i2s (&n->peer),
2140 (unsigned int) n->decrypt_key.crc32, GNUNET_CRYPTO_crc32_n (iv,
2149 * Select messages for transmission. This heuristic uses a combination
2150 * of earliest deadline first (EDF) scheduling (with bounded horizon)
2151 * and priority-based discard (in case no feasible schedule exist) and
2152 * speculative optimization (defer any kind of transmission until
2153 * we either create a batch of significant size, 25% of max, or until
2154 * we are close to a deadline). Furthermore, when scheduling the
2155 * heuristic also packs as many messages into the batch as possible,
2156 * starting with those with the earliest deadline. Yes, this is fun.
2158 * @param n neighbour to select messages from
2159 * @param size number of bytes to select for transmission
2160 * @param retry_time set to the time when we should try again
2161 * (only valid if this function returns zero)
2162 * @return number of bytes selected, or 0 if we decided to
2163 * defer scheduling overall; in that case, retry_time is set.
2166 select_messages (struct Neighbour *n, size_t size,
2167 struct GNUNET_TIME_Relative *retry_time)
2169 struct MessageEntry *pos;
2170 struct MessageEntry *min;
2171 struct MessageEntry *last;
2172 unsigned int min_prio;
2173 struct GNUNET_TIME_Absolute t;
2174 struct GNUNET_TIME_Absolute now;
2175 struct GNUNET_TIME_Relative delta;
2177 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
2180 unsigned int queue_size;
2181 int discard_low_prio;
2183 GNUNET_assert (NULL != n->messages);
2184 now = GNUNET_TIME_absolute_get ();
2185 /* last entry in linked list of messages processed */
2187 /* should we remove the entry with the lowest
2188 * priority from consideration for scheduling at the
2189 * end of the loop? */
2199 discard_low_prio = GNUNET_YES;
2200 while (GNUNET_YES == discard_low_prio)
2203 min_prio = UINT_MAX;
2204 discard_low_prio = GNUNET_NO;
2205 /* calculate number of bytes available for transmission at time "t" */
2206 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
2208 /* how many bytes have we (hypothetically) scheduled so far */
2210 /* maximum time we can wait before transmitting anything
2211 * and still make all of our deadlines */
2212 slack = GNUNET_TIME_UNIT_FOREVER_REL;
2214 /* note that we use "*2" here because we want to look
2215 * a bit further into the future; much more makes no
2216 * sense since new message might be scheduled in the
2218 while ((pos != NULL) && (off < size * 2))
2220 if (pos->do_transmit == GNUNET_YES)
2222 /* already removed from consideration */
2226 if (discard_low_prio == GNUNET_NO)
2228 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
2229 if (delta.rel_value > 0)
2231 // FIXME: HUH? Check!
2234 GNUNET_BANDWIDTH_value_get_available_until (n->bw_out, delta);
2236 if (avail < pos->size)
2238 // FIXME: HUH? Check!
2239 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
2244 /* update slack, considering both its absolute deadline
2245 * and relative deadlines caused by other messages
2246 * with their respective load */
2248 GNUNET_TIME_relative_min (slack,
2249 GNUNET_BANDWIDTH_value_get_delay_for
2250 (n->bw_out, avail));
2251 if (pos->deadline.abs_value <= now.abs_value)
2254 slack = GNUNET_TIME_UNIT_ZERO;
2256 else if (GNUNET_YES == pos->got_slack)
2258 /* should be soon now! */
2260 GNUNET_TIME_relative_min (slack,
2261 GNUNET_TIME_absolute_get_remaining
2262 (pos->slack_deadline));
2267 GNUNET_TIME_relative_min (slack,
2268 GNUNET_TIME_absolute_get_difference
2269 (now, pos->deadline));
2270 pos->got_slack = GNUNET_YES;
2271 pos->slack_deadline =
2272 GNUNET_TIME_absolute_min (pos->deadline,
2273 GNUNET_TIME_relative_to_absolute
2274 (GNUNET_CONSTANTS_MAX_CORK_DELAY));
2279 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
2280 if (pos->priority <= min_prio)
2282 /* update min for discard */
2283 min_prio = pos->priority;
2288 if (discard_low_prio)
2290 GNUNET_assert (min != NULL);
2291 /* remove lowest-priority entry from consideration */
2292 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
2296 /* guard against sending "tiny" messages with large headers without
2297 * urgent deadlines */
2298 if ((slack.rel_value > GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value) &&
2299 (size > 4 * off) && (queue_size <= MAX_PEER_QUEUE_SIZE - 2))
2301 /* less than 25% of message would be filled with deadlines still
2302 * being met if we delay by one second or more; so just wait for
2303 * more data; but do not wait longer than 1s (since we don't want
2304 * to delay messages for a really long time either). */
2305 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
2306 /* reset do_transmit values for next time */
2309 pos->do_transmit = GNUNET_NO;
2312 GNUNET_STATISTICS_update (stats,
2314 ("# transmissions delayed due to corking"), 1,
2317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2318 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
2319 (unsigned long long) retry_time->rel_value, (unsigned int) off,
2320 (unsigned int) size);
2324 /* select marked messages (up to size) for transmission */
2329 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
2331 pos->do_transmit = GNUNET_YES; /* mark for transmission */
2335 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2336 "Selecting message of size %u for transmission\n",
2337 (unsigned int) pos->size);
2343 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2344 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
2345 (unsigned int) pos->size, size);
2347 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
2352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2353 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
2354 (unsigned long long) off, (unsigned long long) tsize, queue_size,
2355 (unsigned int) MAX_PEER_QUEUE_SIZE, GNUNET_i2s (&n->peer));
2362 * Batch multiple messages into a larger buffer.
2364 * @param n neighbour to take messages from
2365 * @param buf target buffer
2366 * @param size size of buf
2367 * @param deadline set to transmission deadline for the result
2368 * @param retry_time set to the time when we should try again
2369 * (only valid if this function returns zero)
2370 * @param priority set to the priority of the batch
2371 * @return number of bytes written to buf (can be zero)
2374 batch_message (struct Neighbour *n, char *buf, size_t size,
2375 struct GNUNET_TIME_Absolute *deadline,
2376 struct GNUNET_TIME_Relative *retry_time, unsigned int *priority)
2378 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
2379 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage *) ntmb;
2380 struct MessageEntry *pos;
2381 struct MessageEntry *prev;
2382 struct MessageEntry *next;
2387 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2388 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
2389 if (0 == select_messages (n, size, retry_time))
2392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2393 "No messages selected, will try again in %llu ms\n",
2394 retry_time->rel_value);
2398 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
2399 ntm->ats_count = htonl (0);
2400 ntm->ats.type = htonl (0);
2401 ntm->ats.value = htonl (0);
2402 ntm->peer = n->peer;
2405 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
2408 if (GNUNET_YES == pos->do_transmit)
2410 GNUNET_assert (pos->size <= size);
2411 /* do notifications */
2412 /* FIXME: track if we have *any* client that wants
2413 * full notifications and only do this if that is
2416 GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
2418 memcpy (&ntm[1], &pos[1], pos->size);
2420 htons (sizeof (struct NotifyTrafficMessage) +
2421 sizeof (struct GNUNET_MessageHeader));
2422 send_to_all_clients (&ntm->header, GNUNET_YES,
2423 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
2427 /* message too large for 'full' notifications, we do at
2428 * least the 'hdr' type */
2429 memcpy (&ntm[1], &pos[1], sizeof (struct GNUNET_MessageHeader));
2432 htons (sizeof (struct NotifyTrafficMessage) + pos->size);
2433 send_to_all_clients (&ntm->header, GNUNET_YES,
2434 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
2436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2437 "Encrypting %u bytes with message of type %u and size %u\n",
2440 ntohs (((const struct GNUNET_MessageHeader *) &pos[1])->type),
2442 ntohs (((const struct GNUNET_MessageHeader *)
2445 /* copy for encrypted transmission */
2446 memcpy (&buf[ret], &pos[1], pos->size);
2449 *priority += pos->priority;
2451 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2452 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
2453 (unsigned int) pos->size,
2454 (unsigned long long)
2455 GNUNET_TIME_absolute_get_remaining (pos->deadline).rel_value);
2457 deadline->abs_value =
2458 GNUNET_MIN (deadline->abs_value, pos->deadline.abs_value);
2472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2473 "Deadline for message batch is %llu ms\n",
2474 GNUNET_TIME_absolute_get_remaining (*deadline).rel_value);
2481 * Remove messages with deadlines that have long expired from
2484 * @param n neighbour to inspect
2487 discard_expired_messages (struct Neighbour *n)
2489 struct MessageEntry *prev;
2490 struct MessageEntry *next;
2491 struct MessageEntry *pos;
2492 struct GNUNET_TIME_Absolute now;
2493 struct GNUNET_TIME_Relative delta;
2495 unsigned int queue_length;
2498 now = GNUNET_TIME_absolute_get ();
2506 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
2507 if (delta.rel_value > PAST_EXPIRATION_DISCARD_TIME.rel_value)
2510 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2511 "Message is %llu ms past due, discarding.\n",
2518 GNUNET_STATISTICS_update (stats,
2520 ("# messages discarded (expired prior to transmission)"),
2529 if ( (GNUNET_YES == disc) &&
2530 (queue_length == MAX_PEER_QUEUE_SIZE) )
2531 schedule_peer_messages (n);
2536 * Signature of the main function of a task.
2538 * @param cls closure
2539 * @param tc context information (why was this task triggered now)
2542 retry_plaintext_processing (void *cls,
2543 const struct GNUNET_SCHEDULER_TaskContext *tc)
2545 struct Neighbour *n = cls;
2547 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2548 process_plaintext_neighbour_queue (n);
2553 * Send our key (and encrypted PING) to the other peer.
2555 * @param n the other peer
2558 send_key (struct Neighbour *n);
2561 * Task that will retry "send_key" if our previous attempt failed
2565 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2567 struct Neighbour *n = cls;
2570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Retrying key transmission to `%4s'\n",
2571 GNUNET_i2s (&n->peer));
2573 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2574 n->set_key_retry_frequency =
2575 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
2581 * Check if we have plaintext messages for the specified neighbour
2582 * pending, and if so, consider batching and encrypting them (and
2583 * then trigger processing of the encrypted queue if needed).
2585 * @param n neighbour to check.
2588 process_plaintext_neighbour_queue (struct Neighbour *n)
2590 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
2592 struct EncryptedMessage *em; /* encrypted message */
2593 struct EncryptedMessage *ph; /* plaintext header */
2594 struct MessageEntry *me;
2595 unsigned int priority;
2596 struct GNUNET_TIME_Absolute deadline;
2597 struct GNUNET_TIME_Relative retry_time;
2598 struct GNUNET_CRYPTO_AesInitializationVector iv;
2599 struct GNUNET_CRYPTO_AuthKey auth_key;
2601 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
2603 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
2604 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2608 case PEER_STATE_DOWN:
2611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2612 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2613 GNUNET_i2s (&n->peer));
2616 case PEER_STATE_KEY_SENT:
2617 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2618 n->retry_set_key_task =
2619 GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2620 &set_key_retry_task, n);
2622 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2623 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2624 GNUNET_i2s (&n->peer));
2627 case PEER_STATE_KEY_RECEIVED:
2628 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2629 n->retry_set_key_task =
2630 GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2631 &set_key_retry_task, n);
2633 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2634 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2635 GNUNET_i2s (&n->peer));
2638 case PEER_STATE_KEY_CONFIRMED:
2639 /* ready to continue */
2642 discard_expired_messages (n);
2643 if (n->messages == NULL)
2646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2647 "Plaintext message queue for `%4s' is empty.\n",
2648 GNUNET_i2s (&n->peer));
2650 return; /* no pending messages */
2652 if (n->encrypted_head != NULL)
2655 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2656 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2657 GNUNET_i2s (&n->peer));
2659 return; /* wait for messages already encrypted to be
2660 * processed first! */
2662 ph = (struct EncryptedMessage *) pbuf;
2663 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2665 used = sizeof (struct EncryptedMessage);
2667 batch_message (n, &pbuf[used],
2668 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE, &deadline,
2669 &retry_time, &priority);
2670 if (used == sizeof (struct EncryptedMessage))
2673 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2674 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2675 GNUNET_i2s (&n->peer));
2677 /* no messages selected for sending, try again later... */
2678 n->retry_plaintext_task =
2679 GNUNET_SCHEDULER_add_delayed (retry_time, &retry_plaintext_processing,
2683 #if DEBUG_CORE_QUOTA
2684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2685 "Sending %u b/s as new limit to peer `%4s'\n",
2686 (unsigned int) ntohl (n->bw_in.value__), GNUNET_i2s (&n->peer));
2689 htonl (GNUNET_CRYPTO_random_u32
2690 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
2691 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2692 ph->inbound_bw_limit = n->bw_in;
2693 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2695 /* setup encryption message header */
2696 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2697 me->deadline = deadline;
2698 me->priority = priority;
2700 em = (struct EncryptedMessage *) &me[1];
2701 em->header.size = htons (used);
2702 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2703 em->iv_seed = ph->iv_seed;
2704 derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
2707 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2708 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2709 (unsigned int) used - ENCRYPTED_HEADER_SIZE,
2710 GNUNET_i2s (&n->peer),
2711 (unsigned long long)
2712 GNUNET_TIME_absolute_get_remaining (deadline).rel_value);
2714 GNUNET_assert (GNUNET_OK ==
2715 do_encrypt (n, &iv, &ph->sequence_number, &em->sequence_number,
2716 used - ENCRYPTED_HEADER_SIZE));
2717 derive_auth_key (&auth_key, &n->encrypt_key, ph->iv_seed,
2718 n->encrypt_key_created);
2719 GNUNET_CRYPTO_hmac (&auth_key, &em->sequence_number,
2720 used - ENCRYPTED_HEADER_SIZE, &em->hmac);
2722 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2723 "Authenticated %u bytes of ciphertext %u: `%s'\n",
2724 used - ENCRYPTED_HEADER_SIZE,
2725 GNUNET_CRYPTO_crc32_n (&em->sequence_number,
2726 used - ENCRYPTED_HEADER_SIZE),
2727 GNUNET_h2s (&em->hmac));
2729 /* append to transmission list */
2730 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head, n->encrypted_tail,
2731 n->encrypted_tail, me);
2732 process_encrypted_neighbour_queue (n);
2733 schedule_peer_messages (n);
2738 * Function that recalculates the bandwidth quota for the
2739 * given neighbour and transmits it to the transport service.
2741 * @param cls neighbour for the quota update
2745 neighbour_quota_update (void *cls,
2746 const struct GNUNET_SCHEDULER_TaskContext *tc);
2750 * Schedule the task that will recalculate the bandwidth
2751 * quota for this peer (and possibly force a disconnect of
2752 * idle peers by calculating a bandwidth of zero).
2755 schedule_quota_update (struct Neighbour *n)
2757 GNUNET_assert (n->quota_update_task == GNUNET_SCHEDULER_NO_TASK);
2758 n->quota_update_task =
2759 GNUNET_SCHEDULER_add_delayed (QUOTA_UPDATE_FREQUENCY,
2760 &neighbour_quota_update, n);
2765 * Initialize a new 'struct Neighbour'.
2767 * @param pid ID of the new neighbour
2768 * @return handle for the new neighbour
2770 static struct Neighbour *
2771 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2773 struct Neighbour *n;
2774 struct GNUNET_TIME_Absolute now;
2777 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2778 "Creating neighbour entry for peer `%4s'\n", GNUNET_i2s (pid));
2780 n = GNUNET_malloc (sizeof (struct Neighbour));
2782 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2783 now = GNUNET_TIME_absolute_get ();
2784 n->encrypt_key_created = now;
2785 n->last_activity = now;
2786 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2787 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2788 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2789 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2790 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2792 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
2793 GNUNET_assert (GNUNET_OK ==
2794 GNUNET_CONTAINER_multihashmap_put (neighbours,
2795 &n->peer.hashPubKey, n,
2796 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2797 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
2798 GNUNET_CONTAINER_multihashmap_size (neighbours),
2800 neighbour_quota_update (n, NULL);
2801 consider_free_neighbour (n);
2807 * Handle CORE_SEND request.
2810 * @param client the client issuing the request
2811 * @param message the "struct SendMessage"
2814 handle_client_send (void *cls, struct GNUNET_SERVER_Client *client,
2815 const struct GNUNET_MessageHeader *message)
2817 const struct SendMessage *sm;
2818 struct Neighbour *n;
2819 struct MessageEntry *prev;
2820 struct MessageEntry *pos;
2821 struct MessageEntry *e;
2822 struct MessageEntry *min_prio_entry;
2823 struct MessageEntry *min_prio_prev;
2824 unsigned int min_prio;
2825 unsigned int queue_size;
2828 msize = ntohs (message->size);
2830 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2832 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2833 "msize is %u, should be at least %u (in %s:%d)\n", msize,
2834 sizeof (struct SendMessage) +
2835 sizeof (struct GNUNET_MessageHeader), __FILE__, __LINE__);
2838 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2841 sm = (const struct SendMessage *) message;
2842 msize -= sizeof (struct SendMessage);
2844 memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2847 GNUNET_SERVER_mst_receive (mst, &self, (const char *) &sm[1], msize,
2848 GNUNET_YES, GNUNET_NO);
2850 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2853 n = find_neighbour (&sm->peer);
2854 if ((n == NULL) || (GNUNET_YES != n->is_connected) ||
2855 (n->status != PEER_STATE_KEY_CONFIRMED))
2857 /* attempt to send message to peer that is not connected anymore
2858 * (can happen due to asynchrony) */
2859 GNUNET_STATISTICS_update (stats,
2861 ("# messages discarded (disconnected)"), 1,
2864 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2869 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2870 "SEND", (unsigned int) msize, GNUNET_i2s (&sm->peer));
2872 discard_expired_messages (n);
2873 /* bound queue size */
2874 /* NOTE: this entire block to bound the queue size should be
2875 * obsolete with the new client-request code and the
2876 * 'schedule_peer_messages' mechanism; we still have this code in
2877 * here for now as a sanity check for the new mechanmism;
2878 * ultimately, we should probably simply reject SEND messages that
2879 * are not 'approved' (or provide a new core API for very unreliable
2880 * delivery that always sends with priority 0). Food for thought. */
2881 min_prio = UINT32_MAX;
2882 min_prio_entry = NULL;
2883 min_prio_prev = NULL;
2889 if (pos->priority <= min_prio)
2891 min_prio_entry = pos;
2892 min_prio_prev = prev;
2893 min_prio = pos->priority;
2899 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2902 if (ntohl (sm->priority) <= min_prio)
2904 /* discard new entry; this should no longer happen! */
2907 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2908 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2909 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
2910 (unsigned int) msize, (unsigned int) ntohs (message->type));
2912 GNUNET_STATISTICS_update (stats,
2913 gettext_noop ("# discarded CORE_SEND requests"),
2917 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2920 GNUNET_assert (min_prio_entry != NULL);
2921 /* discard "min_prio_entry" */
2923 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2924 "Queue full, discarding existing older request\n");
2926 GNUNET_STATISTICS_update (stats,
2928 ("# discarded lower priority CORE_SEND requests"),
2930 if (min_prio_prev == NULL)
2931 n->messages = min_prio_entry->next;
2933 min_prio_prev->next = min_prio_entry->next;
2934 GNUNET_free (min_prio_entry);
2938 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2939 "Adding transmission request for `%4s' of size %u to queue\n",
2940 GNUNET_i2s (&sm->peer), (unsigned int) msize);
2942 GNUNET_break (0 == ntohl (sm->reserved));
2943 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2944 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2945 e->priority = ntohl (sm->priority);
2947 if (GNUNET_YES != (int) ntohl (sm->cork))
2948 e->got_slack = GNUNET_YES;
2949 memcpy (&e[1], &sm[1], msize);
2951 /* insert, keep list sorted by deadline */
2954 while ((pos != NULL) && (pos->deadline.abs_value < e->deadline.abs_value))
2965 /* consider scheduling now */
2966 process_plaintext_neighbour_queue (n);
2968 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2973 * Handle CORE_REQUEST_CONNECT request.
2976 * @param client the client issuing the request
2977 * @param message the "struct ConnectMessage"
2980 handle_client_request_connect (void *cls, struct GNUNET_SERVER_Client *client,
2981 const struct GNUNET_MessageHeader *message)
2983 const struct ConnectMessage *cm = (const struct ConnectMessage *) message;
2984 struct Neighbour *n;
2987 memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2989 /* In this case a client has asked us to connect to ourselves, not really an error! */
2990 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2993 GNUNET_break (ntohl (cm->reserved) == 0);
2995 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2996 "Core received `%s' request for `%4s', will try to establish connection\n",
2997 "REQUEST_CONNECT", GNUNET_i2s (&cm->peer));
2999 GNUNET_STATISTICS_update (stats,
3000 gettext_noop ("# connection requests received"), 1,
3002 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3003 n = find_neighbour (&cm->peer);
3004 if ((n == NULL) || (GNUNET_YES != n->is_connected))
3006 GNUNET_TRANSPORT_try_connect (transport, &cm->peer);
3010 GNUNET_STATISTICS_update (stats,
3012 ("# connection requests ignored (already connected)"),
3019 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3020 * the neighbour's struct and retry send_key. Or, if we did not get a
3021 * HELLO, just do nothing.
3023 * @param cls the 'struct Neighbour' to retry sending the key for
3024 * @param peer the peer for which this is the HELLO
3025 * @param hello HELLO message of that peer
3026 * @param err_msg NULL if successful, otherwise contains error message
3029 process_hello_retry_send_key (void *cls, const struct GNUNET_PeerIdentity *peer,
3030 const struct GNUNET_HELLO_Message *hello,
3031 const char *err_msg)
3033 struct Neighbour *n = cls;
3035 if (err_msg != NULL)
3037 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3038 _("Error in communication with PEERINFO service\n"));
3045 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Entered `%s' and `%s' is NULL!\n",
3046 "process_hello_retry_send_key", "peer");
3049 if (n->public_key != NULL)
3051 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3053 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3054 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3056 GNUNET_STATISTICS_update (stats,
3058 ("# SET_KEY messages deferred (need public key)"),
3065 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3066 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
3067 GNUNET_i2s (&n->peer));
3069 GNUNET_STATISTICS_update (stats,
3071 ("# Delayed connecting due to lack of public key"),
3073 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
3074 n->retry_set_key_task =
3075 GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3076 &set_key_retry_task, n);
3082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Entered `%s' for peer `%4s'\n",
3083 "process_hello_retry_send_key", GNUNET_i2s (peer));
3085 if (n->public_key != NULL)
3087 /* already have public key, why are we here? */
3093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3094 "Received new `%s' message for `%4s', initiating key exchange.\n",
3095 "HELLO", GNUNET_i2s (peer));
3098 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3099 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3101 GNUNET_STATISTICS_update (stats,
3103 ("# Error extracting public key from HELLO"), 1,
3105 GNUNET_free (n->public_key);
3106 n->public_key = NULL;
3108 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3109 "GNUNET_HELLO_get_key returned awfully\n");
3117 * Send our key (and encrypted PING) to the other peer.
3119 * @param n the other peer
3122 send_key (struct Neighbour *n)
3124 struct MessageEntry *pos;
3125 struct SetKeyMessage *sm;
3126 struct MessageEntry *me;
3127 struct PingMessage pp;
3128 struct PingMessage *pm;
3129 struct GNUNET_CRYPTO_AesInitializationVector iv;
3131 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3133 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3134 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3136 if (n->pitr != NULL)
3139 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3140 "Key exchange in progress with `%4s'.\n",
3141 GNUNET_i2s (&n->peer));
3143 return; /* already in progress */
3145 if (GNUNET_YES != n->is_connected)
3147 GNUNET_STATISTICS_update (stats,
3149 ("# Asking transport to connect (for SET_KEY)"),
3151 GNUNET_TRANSPORT_try_connect (transport, &n->peer);
3155 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3156 "Asked to perform key exchange with `%4s'.\n",
3157 GNUNET_i2s (&n->peer));
3159 if (n->public_key == NULL)
3161 /* lookup n's public key, then try again */
3163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3164 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
3165 GNUNET_i2s (&n->peer));
3167 GNUNET_assert (n->pitr == NULL);
3169 GNUNET_PEERINFO_iterate (peerinfo, &n->peer,
3170 GNUNET_TIME_relative_multiply
3171 (GNUNET_TIME_UNIT_SECONDS, 20),
3172 &process_hello_retry_send_key, n);
3175 pos = n->encrypted_head;
3178 if (GNUNET_YES == pos->is_setkey)
3180 if (pos->sender_status == n->status)
3183 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3184 "`%s' message for `%4s' queued already\n", "SET_KEY",
3185 GNUNET_i2s (&n->peer));
3187 goto trigger_processing;
3189 GNUNET_CONTAINER_DLL_remove (n->encrypted_head, n->encrypted_tail, pos);
3192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3193 "Removing queued `%s' message for `%4s', will create a new one\n",
3194 "SET_KEY", GNUNET_i2s (&n->peer));
3204 case PEER_STATE_DOWN:
3205 n->status = PEER_STATE_KEY_SENT;
3207 case PEER_STATE_KEY_SENT:
3209 case PEER_STATE_KEY_RECEIVED:
3211 case PEER_STATE_KEY_CONFIRMED:
3219 /* first, set key message */
3220 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3221 sizeof (struct SetKeyMessage) +
3222 sizeof (struct PingMessage));
3223 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
3224 me->priority = SET_KEY_PRIORITY;
3225 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
3226 me->is_setkey = GNUNET_YES;
3227 me->got_slack = GNUNET_YES; /* do not defer this one! */
3228 me->sender_status = n->status;
3229 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head, n->encrypted_tail,
3230 n->encrypted_tail, me);
3231 sm = (struct SetKeyMessage *) &me[1];
3232 sm->header.size = htons (sizeof (struct SetKeyMessage));
3233 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
3237 PEER_STATE_DOWN) ? PEER_STATE_KEY_SENT : n->status));
3239 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3240 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3241 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3242 sizeof (struct GNUNET_PeerIdentity));
3243 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
3244 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
3245 sm->target = n->peer;
3246 GNUNET_assert (GNUNET_OK ==
3247 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
3249 GNUNET_CRYPTO_AesSessionKey),
3250 n->public_key, &sm->encrypted_key));
3251 GNUNET_assert (GNUNET_OK ==
3252 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
3254 pm = (struct PingMessage *) &sm[1];
3255 pm->header.size = htons (sizeof (struct PingMessage));
3256 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
3258 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3259 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
3260 pp.challenge = n->ping_challenge;
3261 pp.target = n->peer;
3263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3264 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
3265 "SET_KEY", "PING", (unsigned int) n->ping_challenge,
3266 GNUNET_i2s (&n->peer), (unsigned int) n->encrypt_key.crc32,
3267 GNUNET_CRYPTO_crc32_n (&iv, sizeof (iv)), pm->iv_seed);
3269 do_encrypt (n, &iv, &pp.target, &pm->target,
3270 sizeof (struct PingMessage) - ((void *) &pm->target -
3272 GNUNET_STATISTICS_update (stats,
3274 ("# SET_KEY and PING messages created"), 1,
3277 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3278 "Have %llu ms left for `%s' transmission.\n",
3279 (unsigned long long)
3280 GNUNET_TIME_absolute_get_remaining (me->deadline).rel_value,
3284 /* trigger queue processing */
3285 process_encrypted_neighbour_queue (n);
3286 if ((n->status != PEER_STATE_KEY_CONFIRMED) &&
3287 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task))
3288 n->retry_set_key_task =
3289 GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3290 &set_key_retry_task, n);
3295 * We received a SET_KEY message. Validate and update
3296 * our key material and status.
3298 * @param n the neighbour from which we received message m
3299 * @param m the set key message we received
3300 * @param ats performance data
3301 * @param ats_count number of entries in ats (excluding 0-termination)
3304 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m,
3305 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3306 uint32_t ats_count);
3311 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3312 * the neighbour's struct and retry handling the set_key message. Or,
3313 * if we did not get a HELLO, just free the set key message.
3315 * @param cls pointer to the set key message
3316 * @param peer the peer for which this is the HELLO
3317 * @param hello HELLO message of that peer
3318 * @param err_msg NULL if successful, otherwise contains error message
3321 process_hello_retry_handle_set_key (void *cls,
3322 const struct GNUNET_PeerIdentity *peer,
3323 const struct GNUNET_HELLO_Message *hello,
3324 const char *err_msg)
3326 struct Neighbour *n = cls;
3327 struct SetKeyMessage *sm = n->skm;
3329 if (err_msg != NULL)
3331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3332 _("Error in communication with PEERINFO service\n"));
3340 if (n->public_key != NULL)
3343 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3344 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
3345 "HELLO", GNUNET_i2s (&n->peer), "SET_KEY");
3347 handle_set_key (n, sm, NULL, 0);
3351 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3353 ("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
3354 "SET_KEY", GNUNET_i2s (&n->peer));
3359 if (n->public_key != NULL)
3360 return; /* multiple HELLOs match!? */
3362 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3363 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3365 GNUNET_break_op (0);
3366 GNUNET_free (n->public_key);
3367 n->public_key = NULL;
3373 * Merge the given performance data with the data we currently
3374 * track for the given neighbour.
3376 * @param n neighbour
3377 * @param ats new performance data
3378 * @param ats_count number of records in ats
3381 update_neighbour_performance (struct Neighbour *n,
3382 const struct GNUNET_TRANSPORT_ATS_Information
3383 *ats, uint32_t ats_count)
3390 for (i = 0; i < ats_count; i++)
3392 for (j = 0; j < n->ats_count; j++)
3394 if (n->ats[j].type == ats[i].type)
3396 n->ats[j].value = ats[i].value;
3400 if (j == n->ats_count)
3402 GNUNET_array_append (n->ats, n->ats_count, ats[i]);
3409 * We received a PING message. Validate and transmit
3412 * @param n sender of the PING
3413 * @param m the encrypted PING message itself
3414 * @param ats performance data
3415 * @param ats_count number of entries in ats (excluding 0-termination)
3418 handle_ping (struct Neighbour *n, const struct PingMessage *m,
3419 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3422 struct PingMessage t;
3423 struct PongMessage tx;
3424 struct PongMessage *tp;
3425 struct MessageEntry *me;
3426 struct GNUNET_CRYPTO_AesInitializationVector iv;
3429 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3430 "Core service receives `%s' request from `%4s'.\n", "PING",
3431 GNUNET_i2s (&n->peer));
3433 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3435 do_decrypt (n, &iv, &m->target, &t.target,
3436 sizeof (struct PingMessage) - ((void *) &m->target -
3440 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3441 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
3442 "PING", GNUNET_i2s (&t.target), (unsigned int) t.challenge,
3443 (unsigned int) n->decrypt_key.crc32, GNUNET_CRYPTO_crc32_n (&iv,
3448 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages decrypted"),
3451 memcmp (&t.target, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3456 GNUNET_snprintf (sender, sizeof (sender), "%8s", GNUNET_i2s (&n->peer));
3457 GNUNET_snprintf (peer, sizeof (peer), "%8s", GNUNET_i2s (&t.target));
3458 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3460 ("Received PING from `%s' for different identity: I am `%s', PONG identity: `%s'\n"),
3461 sender, GNUNET_i2s (&my_identity), peer);
3462 GNUNET_break_op (0);
3465 update_neighbour_performance (n, ats, ats_count);
3466 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3467 sizeof (struct PongMessage));
3468 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head, n->encrypted_tail,
3469 n->encrypted_tail, me);
3470 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
3471 me->priority = PONG_PRIORITY;
3472 me->size = sizeof (struct PongMessage);
3473 tx.inbound_bw_limit = n->bw_in;
3474 tx.challenge = t.challenge;
3475 tx.target = t.target;
3476 tp = (struct PongMessage *) &me[1];
3477 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
3478 tp->header.size = htons (sizeof (struct PongMessage));
3480 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3481 derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
3482 do_encrypt (n, &iv, &tx.challenge, &tp->challenge,
3483 sizeof (struct PongMessage) - ((void *) &tp->challenge -
3485 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages created"), 1,
3488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3489 "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
3490 "PONG", (unsigned int) t.challenge,
3491 (unsigned int) n->encrypt_key.crc32, GNUNET_CRYPTO_crc32_n (&iv,
3496 /* trigger queue processing */
3497 process_encrypted_neighbour_queue (n);
3502 * We received a PONG message. Validate and update our status.
3504 * @param n sender of the PONG
3505 * @param m the encrypted PONG message itself
3506 * @param ats performance data
3507 * @param ats_count number of entries in ats (excluding 0-termination)
3510 handle_pong (struct Neighbour *n, const struct PongMessage *m,
3511 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3514 struct PongMessage t;
3515 struct ConnectNotifyMessage *cnm;
3516 struct GNUNET_CRYPTO_AesInitializationVector iv;
3517 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
3518 struct GNUNET_TRANSPORT_ATS_Information *mats;
3522 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3523 "Core service receives `%s' response from `%4s'.\n", "PONG",
3524 GNUNET_i2s (&n->peer));
3526 /* mark as garbage, just to be sure */
3527 memset (&t, 255, sizeof (t));
3528 derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
3531 do_decrypt (n, &iv, &m->challenge, &t.challenge,
3532 sizeof (struct PongMessage) - ((void *) &m->challenge -
3535 GNUNET_break_op (0);
3538 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages decrypted"),
3541 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3542 "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
3543 "PONG", GNUNET_i2s (&t.target), (unsigned int) t.challenge,
3544 (unsigned int) n->decrypt_key.crc32, GNUNET_CRYPTO_crc32_n (&iv,
3549 if ((0 != memcmp (&t.target, &n->peer, sizeof (struct GNUNET_PeerIdentity)))
3550 || (n->ping_challenge != t.challenge))
3552 /* PONG malformed */
3554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3555 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
3556 "PONG", GNUNET_i2s (&n->peer),
3557 (unsigned int) n->ping_challenge);
3558 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3559 "Received malformed `%s' received from `%4s' with challenge %u\n",
3560 "PONG", GNUNET_i2s (&t.target), (unsigned int) t.challenge);
3562 GNUNET_break_op (n->ping_challenge != t.challenge);
3567 case PEER_STATE_DOWN:
3568 GNUNET_break (0); /* should be impossible */
3570 case PEER_STATE_KEY_SENT:
3571 GNUNET_break (0); /* should be impossible, how did we decrypt? */
3573 case PEER_STATE_KEY_RECEIVED:
3574 GNUNET_STATISTICS_update (stats,
3576 ("# Session keys confirmed via PONG"), 1,
3578 n->status = PEER_STATE_KEY_CONFIRMED;
3580 struct GNUNET_MessageHeader *hdr;
3582 hdr = compute_type_map_message ();
3583 send_type_map_to_neighbour (hdr, &n->peer.hashPubKey, n);
3586 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
3588 n->bw_out_external_limit = t.inbound_bw_limit;
3590 GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3591 n->bw_out_internal_limit);
3592 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3594 GNUNET_TRANSPORT_set_quota (transport, &n->peer, n->bw_in, n->bw_out);
3597 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3598 "Confirmed key via `%s' message for peer `%4s'\n", "PONG",
3599 GNUNET_i2s (&n->peer));
3601 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3603 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3604 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3606 update_neighbour_performance (n, ats, ats_count);
3608 sizeof (struct ConnectNotifyMessage) +
3609 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3610 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3613 /* recovery strategy: throw away performance data */
3614 GNUNET_array_grow (n->ats, n->ats_count, 0);
3616 sizeof (struct PeerStatusNotifyMessage) +
3617 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3619 cnm = (struct ConnectNotifyMessage *) buf;
3620 cnm->header.size = htons (size);
3621 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
3622 cnm->ats_count = htonl (n->ats_count);
3623 cnm->peer = n->peer;
3625 memcpy (mats, n->ats,
3626 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
3627 mats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3628 mats[n->ats_count].value = htonl (0);
3629 send_to_all_clients (&cnm->header, GNUNET_NO,
3630 GNUNET_CORE_OPTION_SEND_CONNECT);
3631 process_encrypted_neighbour_queue (n);
3633 case PEER_STATE_KEY_CONFIRMED:
3634 n->last_activity = GNUNET_TIME_absolute_get ();
3635 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3636 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3637 n->keep_alive_task =
3638 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide
3639 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3640 2), &send_keep_alive, n);
3641 handle_peer_status_change (n);
3651 * We received a SET_KEY message. Validate and update
3652 * our key material and status.
3654 * @param n the neighbour from which we received message m
3655 * @param m the set key message we received
3656 * @param ats performance data
3657 * @param ats_count number of entries in ats (excluding 0-termination)
3660 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m,
3661 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3664 struct SetKeyMessage *m_cpy;
3665 struct GNUNET_TIME_Absolute t;
3666 struct GNUNET_CRYPTO_AesSessionKey k;
3667 struct PingMessage *ping;
3668 struct PongMessage *pong;
3669 enum PeerStateMachine sender_status;
3672 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3673 "Core service receives `%s' request from `%4s'.\n", "SET_KEY",
3674 GNUNET_i2s (&n->peer));
3676 if (n->public_key == NULL)
3678 if (n->pitr != NULL)
3681 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3682 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3688 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3689 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3691 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3692 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3693 /* lookup n's public key, then try again */
3694 GNUNET_assert (n->skm == NULL);
3697 GNUNET_PEERINFO_iterate (peerinfo, &n->peer, GNUNET_TIME_UNIT_MINUTES,
3698 &process_hello_retry_handle_set_key, n);
3699 GNUNET_STATISTICS_update (stats,
3701 ("# SET_KEY messages deferred (need public key)"),
3706 memcmp (&m->target, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3708 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3710 ("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3711 "SET_KEY", GNUNET_i2s (&m->target));
3714 if ((ntohl (m->purpose.size) !=
3715 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3716 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3717 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3718 sizeof (struct GNUNET_PeerIdentity)) ||
3720 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY, &m->purpose,
3721 &m->signature, n->public_key)))
3723 /* invalid signature */
3724 GNUNET_break_op (0);
3727 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3728 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3729 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3730 (t.abs_value < n->decrypt_key_created.abs_value))
3732 /* this could rarely happen due to massive re-ordering of
3733 * messages on the network level, but is most likely either
3734 * a bug or some adversary messing with us. Report. */
3735 GNUNET_break_op (0);
3739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Decrypting key material.\n");
3741 if ((GNUNET_CRYPTO_rsa_decrypt
3742 (my_private_key, &m->encrypted_key, &k,
3743 sizeof (struct GNUNET_CRYPTO_AesSessionKey)) !=
3744 sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3745 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3747 /* failed to decrypt !? */
3748 GNUNET_break_op (0);
3751 GNUNET_STATISTICS_update (stats,
3752 gettext_noop ("# SET_KEY messages decrypted"), 1,
3755 if (n->decrypt_key_created.abs_value != t.abs_value)
3757 /* fresh key, reset sequence numbers */
3758 n->last_sequence_number_received = 0;
3759 n->last_packets_bitmap = 0;
3760 n->decrypt_key_created = t;
3762 update_neighbour_performance (n, ats, ats_count);
3763 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3766 case PEER_STATE_DOWN:
3767 n->status = PEER_STATE_KEY_RECEIVED;
3769 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3770 "Responding to `%s' with my own key.\n", "SET_KEY");
3774 case PEER_STATE_KEY_SENT:
3775 case PEER_STATE_KEY_RECEIVED:
3776 n->status = PEER_STATE_KEY_RECEIVED;
3777 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3778 (sender_status != PEER_STATE_KEY_CONFIRMED))
3781 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3782 "Responding to `%s' with my own key (other peer has status %u).\n",
3783 "SET_KEY", (unsigned int) sender_status);
3788 case PEER_STATE_KEY_CONFIRMED:
3789 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3790 (sender_status != PEER_STATE_KEY_CONFIRMED))
3793 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3794 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3795 "SET_KEY", (unsigned int) sender_status);
3804 if (n->pending_ping != NULL)
3806 ping = n->pending_ping;
3807 n->pending_ping = NULL;
3808 handle_ping (n, ping, NULL, 0);
3811 if (n->pending_pong != NULL)
3813 pong = n->pending_pong;
3814 n->pending_pong = NULL;
3815 handle_pong (n, pong, NULL, 0);
3822 * Send a P2P message to a client.
3824 * @param sender who sent us the message?
3825 * @param client who should we give the message to?
3826 * @param m contains the message to transmit
3827 * @param msize number of bytes in buf to transmit
3830 send_p2p_message_to_client (struct Neighbour *sender, struct Client *client,
3831 const void *m, size_t msize)
3834 msize + sizeof (struct NotifyTrafficMessage) +
3835 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3837 struct NotifyTrafficMessage *ntm;
3838 struct GNUNET_TRANSPORT_ATS_Information *ats;
3840 GNUNET_assert (GNUNET_YES == sender->is_connected);
3841 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3844 /* recovery strategy: throw performance data away... */
3845 GNUNET_array_grow (sender->ats, sender->ats_count, 0);
3847 msize + sizeof (struct NotifyTrafficMessage) +
3848 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3852 "Core service passes message from `%4s' of type %u to client.\n",
3853 GNUNET_i2s (&sender->peer),
3855 ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3857 ntm = (struct NotifyTrafficMessage *) buf;
3858 ntm->header.size = htons (size);
3859 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3860 ntm->ats_count = htonl (sender->ats_count);
3861 ntm->peer = sender->peer;
3863 memcpy (ats, sender->ats,
3864 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * sender->ats_count);
3865 ats[sender->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3866 ats[sender->ats_count].value = htonl (0);
3867 memcpy (&ats[sender->ats_count + 1], m, msize);
3868 send_to_client (client, &ntm->header, GNUNET_YES);
3873 * Deliver P2P message to interested clients.
3875 * @param cls always NULL
3876 * @param client who sent us the message (struct Neighbour)
3877 * @param m the message
3880 deliver_message (void *cls, void *client, const struct GNUNET_MessageHeader *m)
3882 struct Neighbour *sender = client;
3883 size_t msize = ntohs (m->size);
3885 struct Client *cpos;
3891 type = ntohs (m->type);
3893 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3894 "Received encapsulated message of type %u and size %u from `%4s'\n",
3895 (unsigned int) type, ntohs (m->size), GNUNET_i2s (&sender->peer));
3897 GNUNET_snprintf (buf, sizeof (buf),
3898 gettext_noop ("# bytes of messages of type %u received"),
3899 (unsigned int) type);
3900 GNUNET_STATISTICS_update (stats, buf, msize, GNUNET_NO);
3901 if ((GNUNET_MESSAGE_TYPE_CORE_BINARY_TYPE_MAP == type) ||
3902 (GNUNET_MESSAGE_TYPE_CORE_COMPRESSED_TYPE_MAP == type))
3904 /* FIXME: update message type map for 'Neighbour' */
3907 dropped = GNUNET_YES;
3909 while (cpos != NULL)
3911 deliver_full = GNUNET_NO;
3912 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
3913 deliver_full = GNUNET_YES;
3916 for (tpos = 0; tpos < cpos->tcnt; tpos++)
3918 if (type != cpos->types[tpos])
3920 deliver_full = GNUNET_YES;
3924 if (GNUNET_YES == deliver_full)
3926 send_p2p_message_to_client (sender, cpos, m, msize);
3927 dropped = GNUNET_NO;
3929 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
3931 send_p2p_message_to_client (sender, cpos, m,
3932 sizeof (struct GNUNET_MessageHeader));
3936 if (dropped == GNUNET_YES)
3939 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3940 "Message of type %u from `%4s' not delivered to any client.\n",
3941 (unsigned int) type, GNUNET_i2s (&sender->peer));
3943 GNUNET_STATISTICS_update (stats,
3945 ("# messages not delivered to any client"), 1,
3952 * We received an encrypted message. Decrypt, validate and
3953 * pass on to the appropriate clients.
3955 * @param n target of the message
3956 * @param m encrypted message
3957 * @param ats performance data
3958 * @param ats_count number of entries in ats (excluding 0-termination)
3961 handle_encrypted_message (struct Neighbour *n, const struct EncryptedMessage *m,
3962 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3965 size_t size = ntohs (m->header.size);
3967 struct EncryptedMessage *pt; /* plaintext */
3970 struct GNUNET_TIME_Absolute t;
3971 struct GNUNET_CRYPTO_AesInitializationVector iv;
3972 struct GNUNET_CRYPTO_AuthKey auth_key;
3975 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3976 "Core service receives `%s' request from `%4s'.\n",
3977 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
3980 derive_auth_key (&auth_key, &n->decrypt_key, m->iv_seed,
3981 n->decrypt_key_created);
3982 GNUNET_CRYPTO_hmac (&auth_key, &m->sequence_number,
3983 size - ENCRYPTED_HEADER_SIZE, &ph);
3985 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3986 "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
3987 (unsigned int) size - ENCRYPTED_HEADER_SIZE,
3988 GNUNET_CRYPTO_crc32_n (&m->sequence_number,
3989 size - ENCRYPTED_HEADER_SIZE),
3993 if (0 != memcmp (&ph, &m->hmac, sizeof (GNUNET_HashCode)))
3995 /* checksum failed */
3996 GNUNET_break_op (0);
3999 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
4002 do_decrypt (n, &iv, &m->sequence_number, &buf[ENCRYPTED_HEADER_SIZE],
4003 size - ENCRYPTED_HEADER_SIZE))
4005 pt = (struct EncryptedMessage *) buf;
4007 /* validate sequence number */
4008 snum = ntohl (pt->sequence_number);
4009 if (n->last_sequence_number_received == snum)
4011 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4012 "Received duplicate message, ignoring.\n");
4013 /* duplicate, ignore */
4014 GNUNET_STATISTICS_update (stats,
4015 gettext_noop ("# bytes dropped (duplicates)"),
4019 if ((n->last_sequence_number_received > snum) &&
4020 (n->last_sequence_number_received - snum > 32))
4022 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4023 "Received ancient out of sequence message, ignoring.\n");
4024 /* ancient out of sequence, ignore */
4025 GNUNET_STATISTICS_update (stats,
4027 ("# bytes dropped (out of sequence)"), size,
4031 if (n->last_sequence_number_received > snum)
4033 unsigned int rotbit = 1 << (n->last_sequence_number_received - snum - 1);
4035 if ((n->last_packets_bitmap & rotbit) != 0)
4037 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4038 "Received duplicate message, ignoring.\n");
4039 GNUNET_STATISTICS_update (stats,
4040 gettext_noop ("# bytes dropped (duplicates)"),
4042 /* duplicate, ignore */
4045 n->last_packets_bitmap |= rotbit;
4047 if (n->last_sequence_number_received < snum)
4049 int shift = (snum - n->last_sequence_number_received);
4051 if (shift >= 8 * sizeof (n->last_packets_bitmap))
4052 n->last_packets_bitmap = 0;
4054 n->last_packets_bitmap <<= shift;
4055 n->last_sequence_number_received = snum;
4058 /* check timestamp */
4059 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
4060 if (GNUNET_TIME_absolute_get_duration (t).rel_value >
4061 MAX_MESSAGE_AGE.rel_value)
4063 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4064 _("Message received far too old (%llu ms). Content ignored.\n"),
4065 GNUNET_TIME_absolute_get_duration (t).rel_value);
4066 GNUNET_STATISTICS_update (stats,
4068 ("# bytes dropped (ancient message)"), size,
4073 /* process decrypted message(s) */
4074 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
4076 #if DEBUG_CORE_SET_QUOTA
4077 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4078 "Received %u b/s as new inbound limit for peer `%4s'\n",
4079 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
4080 GNUNET_i2s (&n->peer));
4082 n->bw_out_external_limit = pt->inbound_bw_limit;
4084 GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
4085 n->bw_out_internal_limit);
4086 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
4088 GNUNET_TRANSPORT_set_quota (transport, &n->peer, n->bw_in, n->bw_out);
4090 n->last_activity = GNUNET_TIME_absolute_get ();
4091 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4092 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4093 n->keep_alive_task =
4094 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide
4095 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4096 2), &send_keep_alive, n);
4097 GNUNET_STATISTICS_update (stats,
4098 gettext_noop ("# bytes of payload decrypted"),
4099 size - sizeof (struct EncryptedMessage), GNUNET_NO);
4100 handle_peer_status_change (n);
4101 update_neighbour_performance (n, ats, ats_count);
4103 GNUNET_SERVER_mst_receive (mst, n, &buf[sizeof (struct EncryptedMessage)],
4104 size - sizeof (struct EncryptedMessage),
4105 GNUNET_YES, GNUNET_NO))
4106 GNUNET_break_op (0);
4111 * Function called by the transport for each received message.
4113 * @param cls closure
4114 * @param peer (claimed) identity of the other peer
4115 * @param message the message
4116 * @param ats performance data
4117 * @param ats_count number of entries in ats (excluding 0-termination)
4120 handle_transport_receive (void *cls, const struct GNUNET_PeerIdentity *peer,
4121 const struct GNUNET_MessageHeader *message,
4122 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4125 struct Neighbour *n;
4126 struct GNUNET_TIME_Absolute now;
4133 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4134 "Received message of type %u from `%4s', demultiplexing.\n",
4135 (unsigned int) ntohs (message->type), GNUNET_i2s (peer));
4137 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4142 n = find_neighbour (peer);
4143 if ((n == NULL) || (GNUNET_NO == n->is_connected))
4145 /* received message from peer that is not connected!? */
4149 changed = GNUNET_NO;
4150 up = (n->status == PEER_STATE_KEY_CONFIRMED);
4151 type = ntohs (message->type);
4152 size = ntohs (message->size);
4155 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
4156 if (size != sizeof (struct SetKeyMessage))
4158 GNUNET_break_op (0);
4161 GNUNET_STATISTICS_update (stats, gettext_noop ("# session keys received"),
4163 handle_set_key (n, (const struct SetKeyMessage *) message, ats, ats_count);
4165 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
4167 sizeof (struct EncryptedMessage) + sizeof (struct GNUNET_MessageHeader))
4169 GNUNET_break_op (0);
4172 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4173 (n->status != PEER_STATE_KEY_CONFIRMED))
4175 GNUNET_STATISTICS_update (stats,
4177 ("# failed to decrypt message (no session key)"),
4182 handle_encrypted_message (n, (const struct EncryptedMessage *) message, ats,
4185 case GNUNET_MESSAGE_TYPE_CORE_PING:
4186 if (size != sizeof (struct PingMessage))
4188 GNUNET_break_op (0);
4191 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"),
4193 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4194 (n->status != PEER_STATE_KEY_CONFIRMED))
4197 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4198 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4199 "PING", GNUNET_i2s (&n->peer));
4201 GNUNET_free_non_null (n->pending_ping);
4202 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
4203 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
4206 handle_ping (n, (const struct PingMessage *) message, ats, ats_count);
4208 case GNUNET_MESSAGE_TYPE_CORE_PONG:
4209 if (size != sizeof (struct PongMessage))
4211 GNUNET_break_op (0);
4214 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"),
4216 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4217 (n->status != PEER_STATE_KEY_CONFIRMED))
4220 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4221 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4222 "PONG", GNUNET_i2s (&n->peer));
4224 GNUNET_free_non_null (n->pending_pong);
4225 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
4226 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
4229 handle_pong (n, (const struct PongMessage *) message, ats, ats_count);
4232 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4233 _("Unsupported message of type %u received.\n"),
4234 (unsigned int) type);
4237 if (n->status == PEER_STATE_KEY_CONFIRMED)
4239 now = GNUNET_TIME_absolute_get ();
4240 n->last_activity = now;
4241 changed = GNUNET_YES;
4244 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"),
4246 n->time_established = now;
4248 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4249 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4250 n->keep_alive_task =
4251 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide
4252 (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4253 2), &send_keep_alive, n);
4256 handle_peer_status_change (n);
4261 * Function that recalculates the bandwidth quota for the
4262 * given neighbour and transmits it to the transport service.
4264 * @param cls neighbour for the quota update
4268 neighbour_quota_update (void *cls,
4269 const struct GNUNET_SCHEDULER_TaskContext *tc)
4271 struct Neighbour *n = cls;
4272 struct GNUNET_BANDWIDTH_Value32NBO q_in;
4273 struct GNUNET_BANDWIDTH_Value32NBO q_out;
4274 struct GNUNET_BANDWIDTH_Value32NBO q_out_min;
4277 unsigned long long distributable;
4278 uint64_t need_per_peer;
4279 uint64_t need_per_second;
4280 unsigned int neighbour_count;
4283 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4284 "Neighbour quota update calculation running for peer `%4s'\n",
4285 GNUNET_i2s (&n->peer));
4287 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
4288 /* calculate relative preference among all neighbours;
4289 * divides by a bit more to avoid division by zero AND to
4290 * account for possibility of new neighbours joining any time
4291 * AND to convert to double... */
4292 neighbour_count = GNUNET_CONTAINER_multihashmap_size (neighbours);
4293 if (neighbour_count == 0)
4295 if (preference_sum == 0)
4297 pref_rel = 1.0 / (double) neighbour_count;
4301 pref_rel = (double) n->current_preference / preference_sum;
4304 GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
4305 GNUNET_TIME_UNIT_SECONDS);
4306 need_per_second = need_per_peer * neighbour_count;
4308 /* calculate inbound bandwidth per peer */
4310 if (bandwidth_target_in_bps > need_per_second)
4311 distributable = bandwidth_target_in_bps - need_per_second;
4312 share = distributable * pref_rel;
4313 if (share + need_per_peer > UINT32_MAX)
4314 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4316 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4318 /* calculate outbound bandwidth per peer */
4320 if (bandwidth_target_out_bps > need_per_second)
4321 distributable = bandwidth_target_out_bps - need_per_second;
4322 share = distributable * pref_rel;
4323 if (share + need_per_peer > UINT32_MAX)
4324 q_out = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4326 q_out = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4327 n->bw_out_internal_limit = q_out;
4330 GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
4331 n->bw_out_internal_limit);
4332 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window, n->bw_out);
4334 /* check if we want to disconnect for good due to inactivity */
4335 if ((GNUNET_TIME_absolute_get_duration (get_neighbour_timeout (n)).rel_value >
4337 (GNUNET_TIME_absolute_get_duration (n->time_established).rel_value >
4338 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value))
4341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4342 "Forcing disconnect of `%4s' due to inactivity\n",
4343 GNUNET_i2s (&n->peer));
4345 GNUNET_STATISTICS_update (stats,
4346 gettext_noop ("# peers disconnected due to inactivity"), 1,
4348 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
4350 #if DEBUG_CORE_QUOTA
4351 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4352 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
4353 GNUNET_i2s (&n->peer), (unsigned int) ntohl (q_in.value__),
4354 bandwidth_target_out_bps, (unsigned int) ntohl (n->bw_in.value__),
4355 (unsigned int) ntohl (n->bw_out.value__),
4356 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
4358 if ((n->bw_in.value__ != q_in.value__) ||
4359 (n->bw_out.value__ != q_out_min.value__))
4361 if (n->bw_in.value__ != q_in.value__)
4363 if (n->bw_out.value__ != q_out_min.value__)
4364 n->bw_out = q_out_min;
4365 if (GNUNET_YES == n->is_connected)
4366 GNUNET_TRANSPORT_set_quota (transport, &n->peer, n->bw_in, n->bw_out);
4367 handle_peer_status_change (n);
4369 schedule_quota_update (n);
4374 * Function called by transport to notify us that
4375 * a peer connected to us (on the network level).
4377 * @param cls closure
4378 * @param peer the peer that connected
4379 * @param ats performance data
4380 * @param ats_count number of entries in ats (excluding 0-termination)
4383 handle_transport_notify_connect (void *cls,
4384 const struct GNUNET_PeerIdentity *peer,
4385 const struct GNUNET_TRANSPORT_ATS_Information
4386 *ats, uint32_t ats_count)
4388 struct Neighbour *n;
4390 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4395 n = find_neighbour (peer);
4398 if (GNUNET_YES == n->is_connected)
4400 /* duplicate connect notification!? */
4407 n = create_neighbour (peer);
4409 GNUNET_STATISTICS_update (stats,
4410 gettext_noop ("# peers connected (transport)"), 1,
4412 n->is_connected = GNUNET_YES;
4413 update_neighbour_performance (n, ats, ats_count);
4414 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window, n->bw_out,
4416 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window, n->bw_in,
4419 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received connection from `%4s'.\n",
4420 GNUNET_i2s (&n->peer));
4422 GNUNET_TRANSPORT_set_quota (transport, &n->peer, n->bw_in, n->bw_out);
4428 * Function called by transport telling us that a peer
4431 * @param cls closure
4432 * @param peer the peer that disconnected
4435 handle_transport_notify_disconnect (void *cls,
4436 const struct GNUNET_PeerIdentity *peer)
4438 struct DisconnectNotifyMessage cnm;
4439 struct Neighbour *n;
4440 struct ClientActiveRequest *car;
4441 struct GNUNET_TIME_Relative left;
4444 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4445 "Peer `%4s' disconnected from us; received notification from transport.\n",
4448 n = find_neighbour (peer);
4454 GNUNET_break (n->is_connected == GNUNET_YES);
4455 if (n->status == PEER_STATE_KEY_CONFIRMED)
4457 GNUNET_STATISTICS_update (stats,
4458 gettext_noop ("# peers disconnected due to transport disconnect"), 1,
4460 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
4461 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
4462 cnm.reserved = htonl (0);
4464 send_to_all_clients (&cnm.header, GNUNET_NO,
4465 GNUNET_CORE_OPTION_SEND_DISCONNECT);
4466 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"),
4470 /* On transport disconnect transport doesn't cancel requests, so must do so here. */
4473 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
4476 if (GNUNET_SCHEDULER_NO_TASK != n->keep_alive_task)
4478 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4479 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
4481 n->is_connected = GNUNET_NO;
4482 n->status = PEER_STATE_DOWN;
4483 while (NULL != (car = n->active_client_request_head))
4485 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
4486 n->active_client_request_tail, car);
4487 GNUNET_assert (GNUNET_YES ==
4488 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
4489 &n->peer.hashPubKey,
4494 GNUNET_STATISTICS_update (stats,
4495 gettext_noop ("# peers connected (transport)"), -1,
4497 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
4498 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
4500 GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4501 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
4503 GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (), left);
4504 n->dead_clean_task =
4505 GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
4506 &consider_free_task, n);
4511 * Wrapper around 'free_neighbour'; helper for 'cleaning_task'.
4514 free_neighbour_helper (void *cls, const GNUNET_HashCode * key, void *value)
4516 struct Neighbour *n = value;
4524 * Last task run during shutdown. Disconnects us from
4528 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4533 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core service shutting down.\n");
4535 GNUNET_assert (transport != NULL);
4536 GNUNET_TRANSPORT_disconnect (transport);
4538 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &free_neighbour_helper,
4540 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
4542 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
4544 GNUNET_SERVER_notification_context_destroy (notifier);
4546 while (NULL != (c = clients))
4547 handle_client_disconnect (NULL, c->client_handle);
4548 if (my_private_key != NULL)
4549 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4551 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4552 if (peerinfo != NULL)
4553 GNUNET_PEERINFO_disconnect (peerinfo);
4555 GNUNET_SERVER_mst_destroy (mst);
4560 * Initiate core service.
4562 * @param cls closure
4563 * @param server the initialized server
4564 * @param c configuration to use
4567 run (void *cls, struct GNUNET_SERVER_Handle *server,
4568 const struct GNUNET_CONFIGURATION_Handle *c)
4570 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4571 {&handle_client_init, NULL,
4572 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
4573 {&handle_client_iterate_peers, NULL,
4574 GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS,
4575 sizeof (struct GNUNET_MessageHeader)},
4576 {&handle_client_have_peer, NULL,
4577 GNUNET_MESSAGE_TYPE_CORE_PEER_CONNECTED,
4578 sizeof (struct GNUNET_MessageHeader) +
4579 sizeof (struct GNUNET_PeerIdentity)},
4580 {&handle_client_request_info, NULL,
4581 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
4582 sizeof (struct RequestInfoMessage)},
4583 {&handle_client_send_request, NULL,
4584 GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST,
4585 sizeof (struct SendMessageRequest)},
4586 {&handle_client_send, NULL,
4587 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
4588 {&handle_client_request_connect, NULL,
4589 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
4590 sizeof (struct ConnectMessage)},
4596 /* parse configuration */
4598 GNUNET_CONFIGURATION_get_value_number (c, "CORE", "TOTAL_QUOTA_IN",
4599 &bandwidth_target_in_bps)) ||
4601 GNUNET_CONFIGURATION_get_value_number (c, "CORE", "TOTAL_QUOTA_OUT",
4602 &bandwidth_target_out_bps)) ||
4604 GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY",
4607 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4609 ("Core service is lacking key configuration settings. Exiting.\n"));
4610 GNUNET_SCHEDULER_shutdown ();
4613 peerinfo = GNUNET_PEERINFO_connect (cfg);
4614 if (NULL == peerinfo)
4616 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4617 _("Could not access PEERINFO service. Exiting.\n"));
4618 GNUNET_SCHEDULER_shutdown ();
4619 GNUNET_free (keyfile);
4622 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4623 GNUNET_free (keyfile);
4624 if (my_private_key == NULL)
4626 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4627 _("Core service could not access hostkey. Exiting.\n"));
4628 GNUNET_PEERINFO_disconnect (peerinfo);
4629 GNUNET_SCHEDULER_shutdown ();
4632 neighbours = GNUNET_CONTAINER_multihashmap_create (128);
4633 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4634 GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key),
4635 &my_identity.hashPubKey);
4636 self.public_key = &my_public_key;
4637 self.peer = my_identity;
4638 self.last_activity = GNUNET_TIME_UNIT_FOREVER_ABS;
4639 self.status = PEER_STATE_KEY_CONFIRMED;
4640 self.is_connected = GNUNET_YES;
4641 /* setup notification */
4643 GNUNET_SERVER_notification_context_create (server, MAX_NOTIFY_QUEUE);
4644 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
4645 /* setup transport connection */
4647 GNUNET_TRANSPORT_connect (cfg, &my_identity, NULL,
4648 &handle_transport_receive,
4649 &handle_transport_notify_connect,
4650 &handle_transport_notify_disconnect);
4651 GNUNET_assert (NULL != transport);
4652 stats = GNUNET_STATISTICS_create ("core", cfg);
4653 mst = GNUNET_SERVER_mst_create (&deliver_message, NULL);
4654 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &cleaning_task,
4656 /* process client requests */
4657 GNUNET_SERVER_add_handlers (server, handlers);
4658 GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Core service of `%4s' ready.\n"),
4659 GNUNET_i2s (&my_identity));
4665 * The main function for the transport service.
4667 * @param argc number of arguments from the command line
4668 * @param argv command line arguments
4669 * @return 0 ok, 1 on error
4672 main (int argc, char *const *argv)
4674 return (GNUNET_OK ==
4675 GNUNET_SERVICE_run (argc, argv, "core", GNUNET_SERVICE_OPTION_NONE,
4676 &run, NULL)) ? 0 : 1;
4679 /* end of gnunet-service-core.c */