2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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13 General Public License for more details.
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22 * @file core/gnunet-service-core.c
23 * @brief high-level P2P messaging
24 * @author Christian Grothoff
26 * Considerations for later:
27 * - check that hostkey used by transport (for HELLOs) is the
28 * same as the hostkey that we are using!
29 * - add code to send PINGs if we are about to time-out otherwise
30 * - optimize lookup (many O(n) list traversals
31 * could ideally be changed to O(1) hash map lookups)
34 #include "gnunet_constants.h"
35 #include "gnunet_util_lib.h"
36 #include "gnunet_hello_lib.h"
37 #include "gnunet_peerinfo_service.h"
38 #include "gnunet_protocols.h"
39 #include "gnunet_signatures.h"
40 #include "gnunet_statistics_service.h"
41 #include "gnunet_transport_service.h"
45 #define DEBUG_HANDSHAKE GNUNET_NO
47 #define DEBUG_CORE_QUOTA GNUNET_YES
50 * Receive and send buffer windows grow over time. For
51 * how long can 'unused' bandwidth accumulate before we
52 * need to cap it? (specified in seconds).
54 #define MAX_WINDOW_TIME_S (5 * 60)
57 * How many messages do we queue up at most for optional
58 * notifications to a client? (this can cause notifications
59 * about outgoing messages to be dropped).
61 #define MAX_NOTIFY_QUEUE 1024
64 * Minimum bandwidth (out) to assign to any connected peer.
65 * Should be rather low; values larger than DEFAULT_BW_IN_OUT make no
68 #define MIN_BANDWIDTH_PER_PEER GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT
71 * After how much time past the "official" expiration time do
72 * we discard messages? Should not be zero since we may
73 * intentionally defer transmission until close to the deadline
74 * and then may be slightly past the deadline due to inaccuracy
75 * in sleep and our own CPU consumption.
77 #define PAST_EXPIRATION_DISCARD_TIME GNUNET_TIME_UNIT_SECONDS
80 * What is the maximum delay for a SET_KEY message?
82 #define MAX_SET_KEY_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
85 * How long do we wait for SET_KEY confirmation initially?
87 #define INITIAL_SET_KEY_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 1)
90 * What is the maximum delay for a PING message?
92 #define MAX_PING_DELAY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 2)
95 * What is the maximum delay for a PONG message?
97 #define MAX_PONG_DELAY GNUNET_TIME_relative_multiply (MAX_PING_DELAY, 2)
100 * What is the minimum frequency for a PING message?
102 #define MIN_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
105 * How often do we recalculate bandwidth quotas?
107 #define QUOTA_UPDATE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
110 * What is the priority for a SET_KEY message?
112 #define SET_KEY_PRIORITY 0xFFFFFF
115 * What is the priority for a PING message?
117 #define PING_PRIORITY 0xFFFFFF
120 * What is the priority for a PONG message?
122 #define PONG_PRIORITY 0xFFFFFF
125 * How many messages do we queue per peer at most? Must be at
128 #define MAX_PEER_QUEUE_SIZE 16
131 * How many non-mandatory messages do we queue per client at most?
133 #define MAX_CLIENT_QUEUE_SIZE 32
136 * What is the maximum age of a message for us to consider
137 * processing it? Note that this looks at the timestamp used
138 * by the other peer, so clock skew between machines does
139 * come into play here. So this should be picked high enough
140 * so that a little bit of clock skew does not prevent peers
141 * from connecting to us.
143 #define MAX_MESSAGE_AGE GNUNET_TIME_UNIT_DAYS
147 * State machine for our P2P encryption handshake. Everyone starts in
148 * "DOWN", if we receive the other peer's key (other peer initiated)
149 * we start in state RECEIVED (since we will immediately send our
150 * own); otherwise we start in SENT. If we get back a PONG from
151 * within either state, we move up to CONFIRMED (the PONG will always
152 * be sent back encrypted with the key we sent to the other peer).
154 enum PeerStateMachine
158 PEER_STATE_KEY_RECEIVED,
159 PEER_STATE_KEY_CONFIRMED
164 * Encapsulation for encrypted messages exchanged between
165 * peers. Followed by the actual encrypted data.
167 struct EncryptedMessage
170 * Message type is either CORE_ENCRYPTED_MESSAGE.
172 struct GNUNET_MessageHeader header;
175 * Random value used for IV generation.
177 uint32_t iv_seed GNUNET_PACKED;
180 * MAC of the encrypted message (starting at 'sequence_number'),
181 * used to verify message integrity. Everything after this value
182 * (excluding this value itself) will be encrypted and authenticated.
183 * ENCRYPTED_HEADER_SIZE must be set to the offset of the *next* field.
185 GNUNET_HashCode hmac;
188 * Sequence number, in network byte order. This field
189 * must be the first encrypted/decrypted field
191 uint32_t sequence_number GNUNET_PACKED;
194 * Desired bandwidth (how much we should send to this peer / how
195 * much is the sender willing to receive)?
197 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
200 * Timestamp. Used to prevent reply of ancient messages
201 * (recent messages are caught with the sequence number).
203 struct GNUNET_TIME_AbsoluteNBO timestamp;
209 * Number of bytes (at the beginning) of "struct EncryptedMessage"
210 * that are NOT encrypted.
212 #define ENCRYPTED_HEADER_SIZE (offsetof(struct EncryptedMessage, sequence_number))
216 * We're sending an (encrypted) PING to the other peer to check if he
217 * can decrypt. The other peer should respond with a PONG with the
218 * same content, except this time encrypted with the receiver's key.
223 * Message type is CORE_PING.
225 struct GNUNET_MessageHeader header;
230 uint32_t iv_seed GNUNET_PACKED;
233 * Intended target of the PING, used primarily to check
234 * that decryption actually worked.
236 struct GNUNET_PeerIdentity target;
239 * Random number chosen to make reply harder.
241 uint32_t challenge GNUNET_PACKED;
247 * Response to a PING. Includes data from the original PING
248 * plus initial bandwidth quota information.
253 * Message type is CORE_PONG.
255 struct GNUNET_MessageHeader header;
260 uint32_t iv_seed GNUNET_PACKED;
263 * Random number to make faking the reply harder. Must be
264 * first field after header (this is where we start to encrypt!).
266 uint32_t challenge GNUNET_PACKED;
269 * Desired bandwidth (how much we should send to this
270 * peer / how much is the sender willing to receive).
272 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
275 * Intended target of the PING, used primarily to check
276 * that decryption actually worked.
278 struct GNUNET_PeerIdentity target;
283 * Message transmitted to set (or update) a session key.
289 * Message type is either CORE_SET_KEY.
291 struct GNUNET_MessageHeader header;
294 * Status of the sender (should be in "enum PeerStateMachine"), nbo.
296 int32_t sender_status GNUNET_PACKED;
299 * Purpose of the signature, will be
300 * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
302 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
305 * At what time was this key created?
307 struct GNUNET_TIME_AbsoluteNBO creation_time;
310 * The encrypted session key.
312 struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
315 * Who is the intended recipient?
317 struct GNUNET_PeerIdentity target;
320 * Signature of the stuff above (starting at purpose).
322 struct GNUNET_CRYPTO_RsaSignature signature;
328 * Message waiting for transmission. This struct
329 * is followed by the actual content of the message.
335 * We keep messages in a doubly linked list.
337 struct MessageEntry *next;
340 * We keep messages in a doubly linked list.
342 struct MessageEntry *prev;
345 * By when are we supposed to transmit this message?
347 struct GNUNET_TIME_Absolute deadline;
350 * By when are we supposed to transmit this message (after
353 struct GNUNET_TIME_Absolute slack_deadline;
356 * How important is this message to us?
358 unsigned int priority;
361 * If this is a SET_KEY message, what was our connection status when this
362 * message was queued?
364 enum PeerStateMachine sender_status;
367 * Is this a SET_KEY message?
372 * How long is the message? (number of bytes following
373 * the "struct MessageEntry", but not including the
374 * size of "struct MessageEntry" itself!)
379 * Was this message selected for transmission in the
380 * current round? GNUNET_YES or GNUNET_NO.
385 * Did we give this message some slack (delayed sending) previously
386 * (and hence should not give it any more slack)? GNUNET_YES or
395 * Record kept for each request for transmission issued by a
396 * client that is still pending.
398 struct ClientActiveRequest;
401 * Data kept per neighbouring peer.
406 * We keep neighbours in a linked list (for now).
408 struct Neighbour *next;
411 * Unencrypted messages destined for this peer.
413 struct MessageEntry *messages;
416 * Head of the batched, encrypted message queue (already ordered,
417 * transmit starting with the head).
419 struct MessageEntry *encrypted_head;
422 * Tail of the batched, encrypted message queue (already ordered,
423 * append new messages to tail)
425 struct MessageEntry *encrypted_tail;
428 * Head of list of requests from clients for transmission to
431 struct ClientActiveRequest *active_client_request_head;
434 * Tail of list of requests from clients for transmission to
437 struct ClientActiveRequest *active_client_request_tail;
440 * Handle for pending requests for transmission to this peer
441 * with the transport service. NULL if no request is pending.
443 struct GNUNET_TRANSPORT_TransmitHandle *th;
446 * Public key of the neighbour, NULL if we don't have it yet.
448 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
451 * We received a PING message before we got the "public_key"
452 * (or the SET_KEY). We keep it here until we have a key
453 * to decrypt it. NULL if no PING is pending.
455 struct PingMessage *pending_ping;
458 * We received a PONG message before we got the "public_key"
459 * (or the SET_KEY). We keep it here until we have a key
460 * to decrypt it. NULL if no PONG is pending.
462 struct PongMessage *pending_pong;
465 * Non-NULL if we are currently looking up HELLOs for this peer.
468 struct GNUNET_PEERINFO_IteratorContext *pitr;
471 * SetKeyMessage to transmit, NULL if we are not currently trying
474 struct SetKeyMessage *skm;
477 * Identity of the neighbour.
479 struct GNUNET_PeerIdentity peer;
482 * Key we use to encrypt our messages for the other peer
483 * (initialized by us when we do the handshake).
485 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
488 * Key we use to decrypt messages from the other peer
489 * (given to us by the other peer during the handshake).
491 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
494 * ID of task used for re-trying plaintext scheduling.
496 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
499 * ID of task used for re-trying SET_KEY and PING message.
501 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
504 * ID of task used for updating bandwidth quota for this neighbour.
506 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
509 * ID of task used for sending keep-alive pings.
511 GNUNET_SCHEDULER_TaskIdentifier keep_alive_task;
514 * ID of task used for cleaning up dead neighbour entries.
516 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
519 * At what time did we generate our encryption key?
521 struct GNUNET_TIME_Absolute encrypt_key_created;
524 * At what time did the other peer generate the decryption key?
526 struct GNUNET_TIME_Absolute decrypt_key_created;
529 * At what time did we initially establish (as in, complete session
530 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
532 struct GNUNET_TIME_Absolute time_established;
535 * At what time did we last receive an encrypted message from the
536 * other peer? Should be zero if status != KEY_CONFIRMED.
538 struct GNUNET_TIME_Absolute last_activity;
541 * At what frequency are we currently re-trying SET_KEY messages?
543 struct GNUNET_TIME_Relative set_key_retry_frequency;
546 * Tracking bandwidth for sending to this peer.
548 struct GNUNET_BANDWIDTH_Tracker available_send_window;
551 * Tracking bandwidth for receiving from this peer.
553 struct GNUNET_BANDWIDTH_Tracker available_recv_window;
556 * How valueable were the messages of this peer recently?
558 unsigned long long current_preference;
561 * Bit map indicating which of the 32 sequence numbers before the last
562 * were received (good for accepting out-of-order packets and
563 * estimating reliability of the connection)
565 unsigned int last_packets_bitmap;
568 * last sequence number received on this connection (highest)
570 uint32_t last_sequence_number_received;
573 * last sequence number transmitted
575 uint32_t last_sequence_number_sent;
578 * Available bandwidth in for this peer (current target).
580 struct GNUNET_BANDWIDTH_Value32NBO bw_in;
583 * Available bandwidth out for this peer (current target).
585 struct GNUNET_BANDWIDTH_Value32NBO bw_out;
588 * Internal bandwidth limit set for this peer (initially typically
589 * set to "-1"). Actual "bw_out" is MIN of
590 * "bpm_out_internal_limit" and "bw_out_external_limit".
592 struct GNUNET_BANDWIDTH_Value32NBO bw_out_internal_limit;
595 * External bandwidth limit set for this peer by the
596 * peer that we are communicating with. "bw_out" is MIN of
597 * "bw_out_internal_limit" and "bw_out_external_limit".
599 struct GNUNET_BANDWIDTH_Value32NBO bw_out_external_limit;
602 * What was our PING challenge number (for this peer)?
604 uint32_t ping_challenge;
607 * What is our connection status?
609 enum PeerStateMachine status;
612 * Are we currently connected to this neighbour?
620 * Data structure for each client connected to the core service.
625 * Clients are kept in a linked list.
630 * Handle for the client with the server API.
632 struct GNUNET_SERVER_Client *client_handle;
635 * Array of the types of messages this peer cares
636 * about (with "tcnt" entries). Allocated as part
637 * of this client struct, do not free!
639 const uint16_t *types;
642 * Map of peer identities to active transmission requests of this
643 * client to the peer (of type 'struct ClientActiveRequest').
645 struct GNUNET_CONTAINER_MultiHashMap *requests;
648 * Options for messages this client cares about,
649 * see GNUNET_CORE_OPTION_ values.
654 * Number of types of incoming messages this client
655 * specifically cares about. Size of the "types" array.
663 * Record kept for each request for transmission issued by a
664 * client that is still pending.
666 struct ClientActiveRequest
670 * Active requests are kept in a doubly-linked list of
671 * the respective target peer.
673 struct ClientActiveRequest *next;
676 * Active requests are kept in a doubly-linked list of
677 * the respective target peer.
679 struct ClientActiveRequest *prev;
682 * Handle to the client.
684 struct Client *client;
687 * By what time would the client want to see this message out?
689 struct GNUNET_TIME_Absolute deadline;
692 * How important is this request.
697 * How many more requests does this client have?
702 * How many bytes does the client intend to send?
707 * Unique request ID (in big endian).
718 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
723 static struct GNUNET_PeerIdentity my_identity;
728 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
732 * Handle to peerinfo service.
734 static struct GNUNET_PEERINFO_Handle *peerinfo;
737 * Our message stream tokenizer (for encrypted payload).
739 static struct GNUNET_SERVER_MessageStreamTokenizer *mst;
744 const struct GNUNET_CONFIGURATION_Handle *cfg;
749 static struct GNUNET_TRANSPORT_Handle *transport;
752 * Linked list of our clients.
754 static struct Client *clients;
757 * Context for notifications we need to send to our clients.
759 static struct GNUNET_SERVER_NotificationContext *notifier;
762 * We keep neighbours in a linked list (for now).
764 static struct Neighbour *neighbours;
767 * For creating statistics.
769 static struct GNUNET_STATISTICS_Handle *stats;
772 * Sum of all preferences among all neighbours.
774 static unsigned long long preference_sum;
777 * Total number of neighbours we have.
779 static unsigned int neighbour_count;
782 * How much inbound bandwidth are we supposed to be using per second?
783 * FIXME: this value is not used!
785 static unsigned long long bandwidth_target_in_bps;
788 * How much outbound bandwidth are we supposed to be using per second?
790 static unsigned long long bandwidth_target_out_bps;
793 * Derive an authentication key from "set key" information
796 derive_auth_key (struct GNUNET_CRYPTO_AuthKey *akey,
797 const struct GNUNET_CRYPTO_AesSessionKey *skey,
799 struct GNUNET_TIME_Absolute creation_time)
801 static const char ctx[] = "authentication key";
802 struct GNUNET_TIME_AbsoluteNBO ctbe;
805 ctbe = GNUNET_TIME_absolute_hton (creation_time);
806 GNUNET_CRYPTO_hmac_derive_key (akey,
820 * Derive an IV from packet information
823 derive_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
824 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
825 const struct GNUNET_PeerIdentity *identity)
827 static const char ctx[] = "initialization vector";
829 GNUNET_CRYPTO_aes_derive_iv (iv,
833 &identity->hashPubKey.bits,
834 sizeof(identity->hashPubKey.bits),
840 * Derive an IV from pong packet information
843 derive_pong_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
844 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
845 uint32_t challenge, const struct GNUNET_PeerIdentity *identity)
847 static const char ctx[] = "pong initialization vector";
849 GNUNET_CRYPTO_aes_derive_iv (iv,
853 &identity->hashPubKey.bits,
854 sizeof(identity->hashPubKey.bits),
863 * A preference value for a neighbour was update. Update
864 * the preference sum accordingly.
866 * @param inc how much was a preference value increased?
869 update_preference_sum (unsigned long long inc)
872 unsigned long long os;
875 preference_sum += inc;
876 if (preference_sum >= os)
878 /* overflow! compensate by cutting all values in half! */
883 n->current_preference /= 2;
884 preference_sum += n->current_preference;
887 GNUNET_STATISTICS_set (stats, gettext_noop ("# total peer preference"), preference_sum, GNUNET_NO);
892 * Find the entry for the given neighbour.
894 * @param peer identity of the neighbour
895 * @return NULL if we are not connected, otherwise the
898 static struct Neighbour *
899 find_neighbour (const struct GNUNET_PeerIdentity *peer)
901 struct Neighbour *ret;
904 while ((ret != NULL) &&
905 (0 != memcmp (&ret->peer,
906 peer, sizeof (struct GNUNET_PeerIdentity))))
913 * Send a message to one of our clients.
915 * @param client target for the message
916 * @param msg message to transmit
917 * @param can_drop could this message be dropped if the
918 * client's queue is getting too large?
921 send_to_client (struct Client *client,
922 const struct GNUNET_MessageHeader *msg,
925 #if DEBUG_CORE_CLIENT
926 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
927 "Preparing to send %u bytes of message of type %u to client.\n",
928 (unsigned int) ntohs (msg->size),
929 (unsigned int) ntohs (msg->type));
931 GNUNET_SERVER_notification_context_unicast (notifier,
932 client->client_handle,
939 * Send a message to all of our current clients that have
940 * the right options set.
942 * @param msg message to multicast
943 * @param can_drop can this message be discarded if the queue is too long
944 * @param options mask to use
947 send_to_all_clients (const struct GNUNET_MessageHeader *msg,
956 if (0 != (c->options & options))
958 #if DEBUG_CORE_CLIENT
959 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
960 "Sending message of type %u to client.\n",
961 (unsigned int) ntohs (msg->type));
963 send_to_client (c, msg, can_drop);
971 * Function called by transport telling us that a peer
974 * @param n the peer that changed status
977 handle_peer_status_change (struct Neighbour *n)
979 struct PeerStatusNotifyMessage psnm;
981 if ( (! n->is_connected) ||
982 (n->status != PEER_STATE_KEY_CONFIRMED) )
985 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
986 "Peer `%4s' changed status\n",
987 GNUNET_i2s (&n->peer));
989 psnm.header.size = htons (sizeof (struct PeerStatusNotifyMessage));
990 psnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE);
991 psnm.ats_count = htonl (0);
992 psnm.ats.type = htonl (0);
993 psnm.ats.value = htonl (0);
994 psnm.timeout = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_add (n->last_activity,
995 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
996 psnm.bandwidth_in = n->bw_in;
997 psnm.bandwidth_out = n->bw_out;
999 send_to_all_clients (&psnm.header,
1001 GNUNET_CORE_OPTION_SEND_STATUS_CHANGE);
1002 GNUNET_STATISTICS_update (stats,
1003 gettext_noop ("# peer status changes"),
1010 * Go over our message queue and if it is not too long, go
1011 * over the pending requests from clients for this
1012 * neighbour and send some clients a 'READY' notification.
1014 * @param n which peer to process
1017 schedule_peer_messages (struct Neighbour *n)
1019 struct SendMessageReady smr;
1020 struct ClientActiveRequest *car;
1021 struct ClientActiveRequest *pos;
1023 struct MessageEntry *mqe;
1024 unsigned int queue_size;
1026 /* check if neighbour queue is empty enough! */
1034 if (queue_size >= MAX_PEER_QUEUE_SIZE)
1035 return; /* queue still full */
1036 /* find highest priority request */
1037 pos = n->active_client_request_head;
1041 if ( (car == NULL) ||
1042 (pos->priority > car->priority) )
1047 return; /* no pending requests */
1049 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1050 n->active_client_request_tail,
1052 GNUNET_CONTAINER_multihashmap_remove (c->requests,
1053 &n->peer.hashPubKey,
1055 smr.header.size = htons (sizeof (struct SendMessageReady));
1056 smr.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_READY);
1057 smr.size = htons (car->msize);
1058 smr.smr_id = car->smr_id;
1060 send_to_client (c, &smr.header, GNUNET_NO);
1066 * Handle CORE_SEND_REQUEST message.
1069 handle_client_send_request (void *cls,
1070 struct GNUNET_SERVER_Client *client,
1071 const struct GNUNET_MessageHeader *message)
1073 const struct SendMessageRequest *req;
1074 struct Neighbour *n;
1076 struct ClientActiveRequest *car;
1078 req = (const struct SendMessageRequest*) message;
1079 n = find_neighbour (&req->peer);
1081 (GNUNET_YES != n->is_connected) ||
1082 (n->status != PEER_STATE_KEY_CONFIRMED) )
1084 /* neighbour must have disconnected since request was issued,
1085 ignore (client will realize it once it processes the
1086 disconnect notification) */
1087 GNUNET_STATISTICS_update (stats,
1088 gettext_noop ("# send requests dropped (disconnected)"),
1091 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1095 while ( (c != NULL) &&
1096 (c->client_handle != client) )
1100 /* client did not send INIT first! */
1102 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1105 if (c->requests == NULL)
1106 c->requests = GNUNET_CONTAINER_multihashmap_create (16);
1107 car = GNUNET_CONTAINER_multihashmap_get (c->requests,
1108 &req->peer.hashPubKey);
1111 /* create new entry */
1112 car = GNUNET_malloc (sizeof (struct ClientActiveRequest));
1113 GNUNET_assert (GNUNET_OK ==
1114 GNUNET_CONTAINER_multihashmap_put (c->requests,
1115 &req->peer.hashPubKey,
1117 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
1118 GNUNET_CONTAINER_DLL_insert (n->active_client_request_head,
1119 n->active_client_request_tail,
1123 car->deadline = GNUNET_TIME_absolute_ntoh (req->deadline);
1124 car->priority = ntohl (req->priority);
1125 car->queue_size = ntohl (req->queue_size);
1126 car->msize = ntohs (req->size);
1127 car->smr_id = req->smr_id;
1128 schedule_peer_messages (n);
1129 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1134 * Handle CORE_INIT request.
1137 handle_client_init (void *cls,
1138 struct GNUNET_SERVER_Client *client,
1139 const struct GNUNET_MessageHeader *message)
1141 const struct InitMessage *im;
1142 struct InitReplyMessage irm;
1145 const uint16_t *types;
1147 struct Neighbour *n;
1148 struct ConnectNotifyMessage cnm;
1151 #if DEBUG_CORE_CLIENT
1152 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1153 "Client connecting to core service with `%s' message\n",
1156 /* check that we don't have an entry already */
1160 if (client == c->client_handle)
1163 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1168 msize = ntohs (message->size);
1169 if (msize < sizeof (struct InitMessage))
1172 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1175 GNUNET_SERVER_notification_context_add (notifier, client);
1176 im = (const struct InitMessage *) message;
1177 types = (const uint16_t *) &im[1];
1178 msize -= sizeof (struct InitMessage);
1179 c = GNUNET_malloc (sizeof (struct Client) + msize);
1180 c->client_handle = client;
1183 c->tcnt = msize / sizeof (uint16_t);
1184 c->types = (const uint16_t *) &c[1];
1185 wtypes = (uint16_t *) &c[1];
1186 for (i=0;i<c->tcnt;i++)
1187 wtypes[i] = ntohs (types[i]);
1188 c->options = ntohl (im->options);
1189 #if DEBUG_CORE_CLIENT
1190 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1191 "Client %p is interested in %u message types\n",
1193 (unsigned int) c->tcnt);
1195 /* send init reply message */
1196 irm.header.size = htons (sizeof (struct InitReplyMessage));
1197 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
1198 irm.reserved = htonl (0);
1199 memcpy (&irm.publicKey,
1201 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1202 #if DEBUG_CORE_CLIENT
1203 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1204 "Sending `%s' message to client.\n", "INIT_REPLY");
1206 send_to_client (c, &irm.header, GNUNET_NO);
1207 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
1209 /* notify new client about existing neighbours */
1210 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
1211 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1212 cnm.ats_count = htonl (0);
1213 cnm.ats.type = htonl (0);
1214 cnm.ats.value = htonl (0);
1218 if (n->status == PEER_STATE_KEY_CONFIRMED)
1220 #if DEBUG_CORE_CLIENT
1221 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1222 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
1225 send_to_client (c, &cnm.header, GNUNET_NO);
1230 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1235 * Free client request records.
1238 * @param key identity of peer for which this is an active request
1239 * @param value the 'struct ClientActiveRequest' to free
1240 * @return GNUNET_YES (continue iteration)
1243 destroy_active_client_request (void *cls,
1244 const GNUNET_HashCode *key,
1247 struct ClientActiveRequest *car = cls;
1248 struct Neighbour *n;
1249 struct GNUNET_PeerIdentity peer;
1251 peer.hashPubKey = *key;
1252 n = find_neighbour (&peer);
1253 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1254 n->active_client_request_tail,
1262 * A client disconnected, clean up.
1264 * @param cls closure
1265 * @param client identification of the client
1268 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
1271 struct Client *prev;
1275 #if DEBUG_CORE_CLIENT
1276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1277 "Client %p has disconnected from core service.\n",
1284 if (client == pos->client_handle)
1291 /* client never sent INIT */
1295 clients = pos->next;
1297 prev->next = pos->next;
1298 if (pos->requests != NULL)
1300 GNUNET_CONTAINER_multihashmap_iterate (pos->requests,
1301 &destroy_active_client_request,
1303 GNUNET_CONTAINER_multihashmap_destroy (pos->requests);
1310 * Handle REQUEST_INFO request.
1313 handle_client_request_info (void *cls,
1314 struct GNUNET_SERVER_Client *client,
1315 const struct GNUNET_MessageHeader *message)
1317 const struct RequestInfoMessage *rcm;
1318 struct Neighbour *n;
1319 struct ConfigurationInfoMessage cim;
1320 int32_t want_reserv;
1322 unsigned long long old_preference;
1323 struct GNUNET_SERVER_TransmitContext *tc;
1325 #if DEBUG_CORE_CLIENT
1326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1327 "Core service receives `%s' request.\n", "REQUEST_INFO");
1329 rcm = (const struct RequestInfoMessage *) message;
1330 n = find_neighbour (&rcm->peer);
1331 memset (&cim, 0, sizeof (cim));
1334 want_reserv = ntohl (rcm->reserve_inbound);
1335 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1337 n->bw_out_internal_limit = rcm->limit_outbound;
1338 if (n->bw_out.value__ != GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1339 n->bw_out_external_limit).value__)
1341 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1342 n->bw_out_external_limit);
1343 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1345 GNUNET_TRANSPORT_set_quota (transport,
1349 GNUNET_TIME_UNIT_FOREVER_REL,
1351 handle_peer_status_change (n);
1354 if (want_reserv < 0)
1356 got_reserv = want_reserv;
1358 else if (want_reserv > 0)
1360 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1361 want_reserv).rel_value == 0)
1362 got_reserv = want_reserv;
1364 got_reserv = 0; /* all or nothing */
1368 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1370 old_preference = n->current_preference;
1371 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1372 if (old_preference > n->current_preference)
1374 /* overflow; cap at maximum value */
1375 n->current_preference = ULLONG_MAX;
1377 update_preference_sum (n->current_preference - old_preference);
1378 #if DEBUG_CORE_QUOTA
1379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1380 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1382 GNUNET_i2s (&rcm->peer),
1385 cim.reserved_amount = htonl (got_reserv);
1386 cim.rim_id = rcm->rim_id;
1387 cim.bw_out = n->bw_out;
1388 cim.preference = n->current_preference;
1390 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1391 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1392 cim.peer = rcm->peer;
1394 #if DEBUG_CORE_CLIENT
1395 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1396 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1398 tc = GNUNET_SERVER_transmit_context_create (client);
1399 GNUNET_SERVER_transmit_context_append_message (tc, &cim.header);
1400 GNUNET_SERVER_transmit_context_run (tc,
1401 GNUNET_TIME_UNIT_FOREVER_REL);
1406 * Free the given entry for the neighbour (it has
1407 * already been removed from the list at this point).
1409 * @param n neighbour to free
1412 free_neighbour (struct Neighbour *n)
1414 struct MessageEntry *m;
1415 struct ClientActiveRequest *car;
1418 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1419 "Destroying neighbour entry for peer `%4s'\n",
1420 GNUNET_i2s (&n->peer));
1422 if (n->pitr != NULL)
1424 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1429 GNUNET_free (n->skm);
1432 while (NULL != (m = n->messages))
1434 n->messages = m->next;
1437 while (NULL != (m = n->encrypted_head))
1439 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1444 while (NULL != (car = n->active_client_request_head))
1446 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1447 n->active_client_request_tail,
1449 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
1450 &n->peer.hashPubKey,
1456 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1459 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1460 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
1461 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1462 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
1463 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1464 GNUNET_SCHEDULER_cancel (n->quota_update_task);
1465 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1466 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1467 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1468 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
1469 if (n->status == PEER_STATE_KEY_CONFIRMED)
1470 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), -1, GNUNET_NO);
1471 GNUNET_free_non_null (n->public_key);
1472 GNUNET_free_non_null (n->pending_ping);
1473 GNUNET_free_non_null (n->pending_pong);
1479 * Check if we have encrypted messages for the specified neighbour
1480 * pending, and if so, check with the transport about sending them
1483 * @param n neighbour to check.
1485 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1489 * Encrypt size bytes from in and write the result to out. Use the
1490 * key for outbound traffic of the given neighbour.
1492 * @param n neighbour we are sending to
1493 * @param iv initialization vector to use
1494 * @param in ciphertext
1495 * @param out plaintext
1496 * @param size size of in/out
1497 * @return GNUNET_OK on success
1500 do_encrypt (struct Neighbour *n,
1501 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1502 const void *in, void *out, size_t size)
1504 if (size != (uint16_t) size)
1509 GNUNET_assert (size ==
1510 GNUNET_CRYPTO_aes_encrypt (in,
1514 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1517 "Encrypted %u bytes for `%4s' using key %u, IV %u\n",
1518 (unsigned int) size,
1519 GNUNET_i2s (&n->peer),
1520 (unsigned int) n->encrypt_key.crc32,
1521 GNUNET_CRYPTO_crc32_n (iv, sizeof(iv)));
1528 * Consider freeing the given neighbour since we may not need
1529 * to keep it around anymore.
1531 * @param n neighbour to consider discarding
1534 consider_free_neighbour (struct Neighbour *n);
1538 * Task triggered when a neighbour entry is about to time out
1539 * (and we should prevent this by sending a PING).
1541 * @param cls the 'struct Neighbour'
1542 * @param tc scheduler context (not used)
1545 send_keep_alive (void *cls,
1546 const struct GNUNET_SCHEDULER_TaskContext *tc)
1548 struct Neighbour *n = cls;
1549 struct GNUNET_TIME_Relative retry;
1550 struct GNUNET_TIME_Relative left;
1551 struct MessageEntry *me;
1552 struct PingMessage pp;
1553 struct PingMessage *pm;
1554 struct GNUNET_CRYPTO_AesInitializationVector iv;
1556 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1558 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1559 sizeof (struct PingMessage));
1560 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1561 me->priority = PING_PRIORITY;
1562 me->size = sizeof (struct PingMessage);
1563 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1567 pm = (struct PingMessage *) &me[1];
1568 pm->header.size = htons (sizeof (struct PingMessage));
1569 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1570 pm->iv_seed = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1572 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
1573 pp.challenge = n->ping_challenge;
1574 pp.target = n->peer;
1576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1577 "Encrypting `%s' message with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
1579 (unsigned int) n->ping_challenge,
1580 GNUNET_i2s (&n->peer),
1581 (unsigned int) n->encrypt_key.crc32,
1582 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
1589 sizeof (struct PingMessage) -
1590 ((void *) &pm->target - (void *) pm));
1591 process_encrypted_neighbour_queue (n);
1592 /* reschedule PING job */
1593 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1594 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1595 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1596 MIN_PING_FREQUENCY);
1598 = GNUNET_SCHEDULER_add_delayed (retry,
1606 * Task triggered when a neighbour entry might have gotten stale.
1608 * @param cls the 'struct Neighbour'
1609 * @param tc scheduler context (not used)
1612 consider_free_task (void *cls,
1613 const struct GNUNET_SCHEDULER_TaskContext *tc)
1615 struct Neighbour *n = cls;
1617 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1618 consider_free_neighbour (n);
1623 * Consider freeing the given neighbour since we may not need
1624 * to keep it around anymore.
1626 * @param n neighbour to consider discarding
1629 consider_free_neighbour (struct Neighbour *n)
1631 struct Neighbour *pos;
1632 struct Neighbour *prev;
1633 struct GNUNET_TIME_Relative left;
1635 if ( (n->th != NULL) ||
1636 (n->pitr != NULL) ||
1637 (GNUNET_YES == n->is_connected) )
1638 return; /* no chance */
1640 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1641 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1642 if (left.rel_value > 0)
1644 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1645 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1646 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (left,
1647 &consider_free_task,
1651 /* actually free the neighbour... */
1660 neighbours = n->next;
1662 prev->next = n->next;
1663 GNUNET_assert (neighbour_count > 0);
1665 GNUNET_STATISTICS_set (stats,
1666 gettext_noop ("# neighbour entries allocated"),
1674 * Function called when the transport service is ready to
1675 * receive an encrypted message for the respective peer
1677 * @param cls neighbour to use message from
1678 * @param size number of bytes we can transmit
1679 * @param buf where to copy the message
1680 * @return number of bytes transmitted
1683 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1685 struct Neighbour *n = cls;
1686 struct MessageEntry *m;
1691 m = n->encrypted_head;
1695 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1696 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1697 GNUNET_i2s (&n->peer));
1701 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1708 GNUNET_assert (size >= m->size);
1709 memcpy (cbuf, &m[1], m->size);
1711 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1714 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1715 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1716 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1718 GNUNET_i2s (&n->peer));
1720 process_encrypted_neighbour_queue (n);
1725 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1726 "Transmission of message of type %u and size %u failed\n",
1727 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1728 (unsigned int) m->size);
1732 consider_free_neighbour (n);
1738 * Check if we have plaintext messages for the specified neighbour
1739 * pending, and if so, consider batching and encrypting them (and
1740 * then trigger processing of the encrypted queue if needed).
1742 * @param n neighbour to check.
1744 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1748 * Check if we have encrypted messages for the specified neighbour
1749 * pending, and if so, check with the transport about sending them
1752 * @param n neighbour to check.
1755 process_encrypted_neighbour_queue (struct Neighbour *n)
1757 struct MessageEntry *m;
1760 return; /* request already pending */
1761 m = n->encrypted_head;
1764 /* encrypted queue empty, try plaintext instead */
1765 process_plaintext_neighbour_queue (n);
1769 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1770 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1771 (unsigned int) m->size,
1772 GNUNET_i2s (&n->peer),
1773 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
1776 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1779 GNUNET_TIME_absolute_get_remaining
1781 ¬ify_encrypted_transmit_ready,
1785 /* message request too large or duplicate request */
1787 /* discard encrypted message */
1788 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1792 process_encrypted_neighbour_queue (n);
1798 * Decrypt size bytes from in and write the result to out. Use the
1799 * key for inbound traffic of the given neighbour. This function does
1800 * NOT do any integrity-checks on the result.
1802 * @param n neighbour we are receiving from
1803 * @param iv initialization vector to use
1804 * @param in ciphertext
1805 * @param out plaintext
1806 * @param size size of in/out
1807 * @return GNUNET_OK on success
1810 do_decrypt (struct Neighbour *n,
1811 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1812 const void *in, void *out, size_t size)
1814 if (size != (uint16_t) size)
1819 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1820 (n->status != PEER_STATE_KEY_CONFIRMED))
1822 GNUNET_break_op (0);
1823 return GNUNET_SYSERR;
1826 GNUNET_CRYPTO_aes_decrypt (in,
1833 return GNUNET_SYSERR;
1835 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes decrypted"), size, GNUNET_NO);
1837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1838 "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
1839 (unsigned int) size,
1840 GNUNET_i2s (&n->peer),
1841 (unsigned int) n->decrypt_key.crc32,
1842 GNUNET_CRYPTO_crc32_n (iv, sizeof(*iv)));
1849 * Select messages for transmission. This heuristic uses a combination
1850 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1851 * and priority-based discard (in case no feasible schedule exist) and
1852 * speculative optimization (defer any kind of transmission until
1853 * we either create a batch of significant size, 25% of max, or until
1854 * we are close to a deadline). Furthermore, when scheduling the
1855 * heuristic also packs as many messages into the batch as possible,
1856 * starting with those with the earliest deadline. Yes, this is fun.
1858 * @param n neighbour to select messages from
1859 * @param size number of bytes to select for transmission
1860 * @param retry_time set to the time when we should try again
1861 * (only valid if this function returns zero)
1862 * @return number of bytes selected, or 0 if we decided to
1863 * defer scheduling overall; in that case, retry_time is set.
1866 select_messages (struct Neighbour *n,
1867 size_t size, struct GNUNET_TIME_Relative *retry_time)
1869 struct MessageEntry *pos;
1870 struct MessageEntry *min;
1871 struct MessageEntry *last;
1872 unsigned int min_prio;
1873 struct GNUNET_TIME_Absolute t;
1874 struct GNUNET_TIME_Absolute now;
1875 struct GNUNET_TIME_Relative delta;
1877 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
1880 unsigned int queue_size;
1881 int discard_low_prio;
1883 GNUNET_assert (NULL != n->messages);
1884 now = GNUNET_TIME_absolute_get ();
1885 /* last entry in linked list of messages processed */
1887 /* should we remove the entry with the lowest
1888 priority from consideration for scheduling at the
1899 discard_low_prio = GNUNET_YES;
1900 while (GNUNET_YES == discard_low_prio)
1903 min_prio = UINT_MAX;
1904 discard_low_prio = GNUNET_NO;
1905 /* calculate number of bytes available for transmission at time "t" */
1906 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
1908 /* how many bytes have we (hypothetically) scheduled so far */
1910 /* maximum time we can wait before transmitting anything
1911 and still make all of our deadlines */
1912 slack = GNUNET_TIME_UNIT_FOREVER_REL;
1914 /* note that we use "*2" here because we want to look
1915 a bit further into the future; much more makes no
1916 sense since new message might be scheduled in the
1918 while ((pos != NULL) && (off < size * 2))
1920 if (pos->do_transmit == GNUNET_YES)
1922 /* already removed from consideration */
1926 if (discard_low_prio == GNUNET_NO)
1928 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
1929 if (delta.rel_value > 0)
1931 // FIXME: HUH? Check!
1933 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
1936 if (avail < pos->size)
1938 // FIXME: HUH? Check!
1939 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1944 /* update slack, considering both its absolute deadline
1945 and relative deadlines caused by other messages
1946 with their respective load */
1947 slack = GNUNET_TIME_relative_min (slack,
1948 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
1950 if (pos->deadline.abs_value <= now.abs_value)
1953 slack = GNUNET_TIME_UNIT_ZERO;
1955 else if (GNUNET_YES == pos->got_slack)
1957 /* should be soon now! */
1958 slack = GNUNET_TIME_relative_min (slack,
1959 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
1964 GNUNET_TIME_relative_min (slack,
1965 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
1966 pos->got_slack = GNUNET_YES;
1967 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
1968 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
1973 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
1974 if (pos->priority <= min_prio)
1976 /* update min for discard */
1977 min_prio = pos->priority;
1982 if (discard_low_prio)
1984 GNUNET_assert (min != NULL);
1985 /* remove lowest-priority entry from consideration */
1986 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1990 /* guard against sending "tiny" messages with large headers without
1992 if ( (slack.rel_value > GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value) &&
1994 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
1996 /* less than 25% of message would be filled with deadlines still
1997 being met if we delay by one second or more; so just wait for
1998 more data; but do not wait longer than 1s (since we don't want
1999 to delay messages for a really long time either). */
2000 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
2001 /* reset do_transmit values for next time */
2004 pos->do_transmit = GNUNET_NO;
2007 GNUNET_STATISTICS_update (stats,
2008 gettext_noop ("# transmissions delayed due to corking"),
2011 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2012 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
2013 (unsigned long long) retry_time->rel_value,
2015 (unsigned int) size);
2019 /* select marked messages (up to size) for transmission */
2024 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
2026 pos->do_transmit = GNUNET_YES; /* mark for transmission */
2030 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2031 "Selecting message of size %u for transmission\n",
2032 (unsigned int) pos->size);
2038 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2039 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
2040 (unsigned int) pos->size,
2043 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
2048 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2049 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
2050 (unsigned long long) off, (unsigned long long) tsize,
2051 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
2052 GNUNET_i2s (&n->peer));
2059 * Batch multiple messages into a larger buffer.
2061 * @param n neighbour to take messages from
2062 * @param buf target buffer
2063 * @param size size of buf
2064 * @param deadline set to transmission deadline for the result
2065 * @param retry_time set to the time when we should try again
2066 * (only valid if this function returns zero)
2067 * @param priority set to the priority of the batch
2068 * @return number of bytes written to buf (can be zero)
2071 batch_message (struct Neighbour *n,
2074 struct GNUNET_TIME_Absolute *deadline,
2075 struct GNUNET_TIME_Relative *retry_time,
2076 unsigned int *priority)
2078 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
2079 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
2080 struct MessageEntry *pos;
2081 struct MessageEntry *prev;
2082 struct MessageEntry *next;
2087 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2088 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
2089 if (0 == select_messages (n, size, retry_time))
2092 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2093 "No messages selected, will try again in %llu ms\n",
2094 retry_time->rel_value);
2098 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
2099 ntm->ats_count = htonl (0);
2100 ntm->ats.type = htonl (0);
2101 ntm->ats.value = htonl (0);
2102 ntm->peer = n->peer;
2105 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
2108 if (GNUNET_YES == pos->do_transmit)
2110 GNUNET_assert (pos->size <= size);
2111 /* do notifications */
2112 /* FIXME: track if we have *any* client that wants
2113 full notifications and only do this if that is
2115 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
2117 memcpy (&ntm[1], &pos[1], pos->size);
2118 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2119 sizeof (struct GNUNET_MessageHeader));
2120 send_to_all_clients (&ntm->header,
2122 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
2126 /* message too large for 'full' notifications, we do at
2127 least the 'hdr' type */
2130 sizeof (struct GNUNET_MessageHeader));
2132 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2134 send_to_all_clients (&ntm->header,
2136 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
2138 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2139 "Encrypting %u bytes with message of type %u and size %u\n",
2141 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
2142 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
2144 /* copy for encrypted transmission */
2145 memcpy (&buf[ret], &pos[1], pos->size);
2148 *priority += pos->priority;
2150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2151 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
2152 (unsigned int) pos->size,
2153 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).rel_value);
2155 deadline->abs_value = GNUNET_MIN (deadline->abs_value, pos->deadline.abs_value);
2169 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2170 "Deadline for message batch is %llu ms\n",
2171 GNUNET_TIME_absolute_get_remaining (*deadline).rel_value);
2178 * Remove messages with deadlines that have long expired from
2181 * @param n neighbour to inspect
2184 discard_expired_messages (struct Neighbour *n)
2186 struct MessageEntry *prev;
2187 struct MessageEntry *next;
2188 struct MessageEntry *pos;
2189 struct GNUNET_TIME_Absolute now;
2190 struct GNUNET_TIME_Relative delta;
2194 now = GNUNET_TIME_absolute_get ();
2200 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
2201 if (delta.rel_value > PAST_EXPIRATION_DISCARD_TIME.rel_value)
2204 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2205 "Message is %llu ms past due, discarding.\n",
2212 GNUNET_STATISTICS_update (stats,
2213 gettext_noop ("# messages discarded (expired prior to transmission)"),
2223 if (GNUNET_YES == disc)
2224 schedule_peer_messages (n);
2229 * Signature of the main function of a task.
2231 * @param cls closure
2232 * @param tc context information (why was this task triggered now)
2235 retry_plaintext_processing (void *cls,
2236 const struct GNUNET_SCHEDULER_TaskContext *tc)
2238 struct Neighbour *n = cls;
2240 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2241 process_plaintext_neighbour_queue (n);
2246 * Send our key (and encrypted PING) to the other peer.
2248 * @param n the other peer
2250 static void send_key (struct Neighbour *n);
2253 * Task that will retry "send_key" if our previous attempt failed
2257 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2259 struct Neighbour *n = cls;
2262 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2263 "Retrying key transmission to `%4s'\n",
2264 GNUNET_i2s (&n->peer));
2266 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2267 n->set_key_retry_frequency =
2268 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
2274 * Check if we have plaintext messages for the specified neighbour
2275 * pending, and if so, consider batching and encrypting them (and
2276 * then trigger processing of the encrypted queue if needed).
2278 * @param n neighbour to check.
2281 process_plaintext_neighbour_queue (struct Neighbour *n)
2283 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
2285 struct EncryptedMessage *em; /* encrypted message */
2286 struct EncryptedMessage *ph; /* plaintext header */
2287 struct MessageEntry *me;
2288 unsigned int priority;
2289 struct GNUNET_TIME_Absolute deadline;
2290 struct GNUNET_TIME_Relative retry_time;
2291 struct GNUNET_CRYPTO_AesInitializationVector iv;
2292 struct GNUNET_CRYPTO_AuthKey auth_key;
2294 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
2296 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
2297 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2301 case PEER_STATE_DOWN:
2304 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2305 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2306 GNUNET_i2s(&n->peer));
2309 case PEER_STATE_KEY_SENT:
2310 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2311 n->retry_set_key_task
2312 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2313 &set_key_retry_task, n);
2315 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2316 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2317 GNUNET_i2s(&n->peer));
2320 case PEER_STATE_KEY_RECEIVED:
2321 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2322 n->retry_set_key_task
2323 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2324 &set_key_retry_task, n);
2326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2327 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2328 GNUNET_i2s(&n->peer));
2331 case PEER_STATE_KEY_CONFIRMED:
2332 /* ready to continue */
2335 discard_expired_messages (n);
2336 if (n->messages == NULL)
2339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2340 "Plaintext message queue for `%4s' is empty.\n",
2341 GNUNET_i2s(&n->peer));
2343 return; /* no pending messages */
2345 if (n->encrypted_head != NULL)
2348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2349 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2350 GNUNET_i2s(&n->peer));
2352 return; /* wait for messages already encrypted to be
2355 ph = (struct EncryptedMessage *) pbuf;
2356 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2358 used = sizeof (struct EncryptedMessage);
2359 used += batch_message (n,
2361 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2362 &deadline, &retry_time, &priority);
2363 if (used == sizeof (struct EncryptedMessage))
2366 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2367 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2368 GNUNET_i2s(&n->peer));
2370 /* no messages selected for sending, try again later... */
2371 n->retry_plaintext_task =
2372 GNUNET_SCHEDULER_add_delayed (retry_time,
2373 &retry_plaintext_processing, n);
2376 #if DEBUG_CORE_QUOTA
2377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2378 "Sending %u b/s as new limit to peer `%4s'\n",
2379 (unsigned int) ntohl (n->bw_in.value__),
2380 GNUNET_i2s (&n->peer));
2382 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
2383 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2384 ph->inbound_bw_limit = n->bw_in;
2385 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2387 /* setup encryption message header */
2388 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2389 me->deadline = deadline;
2390 me->priority = priority;
2392 em = (struct EncryptedMessage *) &me[1];
2393 em->header.size = htons (used);
2394 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2395 em->iv_seed = ph->iv_seed;
2396 derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
2399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2400 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2401 (unsigned int) used - ENCRYPTED_HEADER_SIZE,
2402 GNUNET_i2s(&n->peer),
2403 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).rel_value);
2405 GNUNET_assert (GNUNET_OK ==
2408 &ph->sequence_number,
2409 &em->sequence_number, used - ENCRYPTED_HEADER_SIZE));
2410 derive_auth_key (&auth_key,
2413 n->encrypt_key_created);
2414 GNUNET_CRYPTO_hmac (&auth_key,
2415 &em->sequence_number,
2416 used - ENCRYPTED_HEADER_SIZE,
2419 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2420 "Authenticated %u bytes of ciphertext %u: `%s'\n",
2421 used - ENCRYPTED_HEADER_SIZE,
2422 GNUNET_CRYPTO_crc32_n (&em->sequence_number,
2423 used - ENCRYPTED_HEADER_SIZE),
2424 GNUNET_h2s (&em->hmac));
2426 /* append to transmission list */
2427 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2431 process_encrypted_neighbour_queue (n);
2432 schedule_peer_messages (n);
2437 * Function that recalculates the bandwidth quota for the
2438 * given neighbour and transmits it to the transport service.
2440 * @param cls neighbour for the quota update
2444 neighbour_quota_update (void *cls,
2445 const struct GNUNET_SCHEDULER_TaskContext *tc);
2449 * Schedule the task that will recalculate the bandwidth
2450 * quota for this peer (and possibly force a disconnect of
2451 * idle peers by calculating a bandwidth of zero).
2454 schedule_quota_update (struct Neighbour *n)
2456 GNUNET_assert (n->quota_update_task ==
2457 GNUNET_SCHEDULER_NO_TASK);
2458 n->quota_update_task
2459 = GNUNET_SCHEDULER_add_delayed (QUOTA_UPDATE_FREQUENCY,
2460 &neighbour_quota_update,
2466 * Initialize a new 'struct Neighbour'.
2468 * @param pid ID of the new neighbour
2469 * @return handle for the new neighbour
2471 static struct Neighbour *
2472 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2474 struct Neighbour *n;
2475 struct GNUNET_TIME_Absolute now;
2478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2479 "Creating neighbour entry for peer `%4s'\n",
2482 n = GNUNET_malloc (sizeof (struct Neighbour));
2483 n->next = neighbours;
2486 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
2488 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2489 now = GNUNET_TIME_absolute_get ();
2490 n->encrypt_key_created = now;
2491 n->last_activity = now;
2492 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2493 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2494 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2495 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2496 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2497 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
2499 neighbour_quota_update (n, NULL);
2500 consider_free_neighbour (n);
2506 * Handle CORE_SEND request.
2509 * @param client the client issuing the request
2510 * @param message the "struct SendMessage"
2513 handle_client_send (void *cls,
2514 struct GNUNET_SERVER_Client *client,
2515 const struct GNUNET_MessageHeader *message)
2517 const struct SendMessage *sm;
2518 struct Neighbour *n;
2519 struct MessageEntry *prev;
2520 struct MessageEntry *pos;
2521 struct MessageEntry *e;
2522 struct MessageEntry *min_prio_entry;
2523 struct MessageEntry *min_prio_prev;
2524 unsigned int min_prio;
2525 unsigned int queue_size;
2528 msize = ntohs (message->size);
2530 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2532 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "about to assert fail, msize is %d, should be at least %d\n", msize, sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader));
2535 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2538 sm = (const struct SendMessage *) message;
2539 msize -= sizeof (struct SendMessage);
2540 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2542 /* FIXME: should we not allow loopback-injection here? */
2545 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2548 n = find_neighbour (&sm->peer);
2550 n = create_neighbour (&sm->peer);
2552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2553 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2555 (unsigned int) msize,
2556 GNUNET_i2s (&sm->peer));
2558 discard_expired_messages (n);
2559 /* bound queue size */
2560 /* NOTE: this entire block to bound the queue size should be
2561 obsolete with the new client-request code and the
2562 'schedule_peer_messages' mechanism; we still have this code in
2563 here for now as a sanity check for the new mechanmism;
2564 ultimately, we should probably simply reject SEND messages that
2565 are not 'approved' (or provide a new core API for very unreliable
2566 delivery that always sends with priority 0). Food for thought. */
2567 min_prio = UINT32_MAX;
2568 min_prio_entry = NULL;
2569 min_prio_prev = NULL;
2575 if (pos->priority <= min_prio)
2577 min_prio_entry = pos;
2578 min_prio_prev = prev;
2579 min_prio = pos->priority;
2585 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2588 if (ntohl(sm->priority) <= min_prio)
2590 /* discard new entry; this should no longer happen! */
2593 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2594 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2596 (unsigned int) MAX_PEER_QUEUE_SIZE,
2597 (unsigned int) msize,
2598 (unsigned int) ntohs (message->type));
2600 GNUNET_STATISTICS_update (stats,
2601 gettext_noop ("# discarded CORE_SEND requests"),
2605 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2608 GNUNET_assert (min_prio_entry != NULL);
2609 /* discard "min_prio_entry" */
2611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2612 "Queue full, discarding existing older request\n");
2614 GNUNET_STATISTICS_update (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 1, GNUNET_NO);
2615 if (min_prio_prev == NULL)
2616 n->messages = min_prio_entry->next;
2618 min_prio_prev->next = min_prio_entry->next;
2619 GNUNET_free (min_prio_entry);
2623 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2624 "Adding transmission request for `%4s' of size %u to queue\n",
2625 GNUNET_i2s (&sm->peer),
2626 (unsigned int) msize);
2628 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2629 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2630 e->priority = ntohl (sm->priority);
2632 memcpy (&e[1], &sm[1], msize);
2634 /* insert, keep list sorted by deadline */
2637 while ((pos != NULL) && (pos->deadline.abs_value < e->deadline.abs_value))
2648 /* consider scheduling now */
2649 process_plaintext_neighbour_queue (n);
2651 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2656 * Function called when the transport service is ready to
2657 * receive a message. Only resets 'n->th' to NULL.
2659 * @param cls neighbour to use message from
2660 * @param size number of bytes we can transmit
2661 * @param buf where to copy the message
2662 * @return number of bytes transmitted
2665 notify_transport_connect_done (void *cls, size_t size, void *buf)
2667 struct Neighbour *n = cls;
2669 if (GNUNET_YES != n->is_connected)
2671 /* transport should only call us to transmit a message after
2672 * telling us about a successful connection to the respective peer */
2673 n->th = NULL; /* If this happens because of a timeout, reset n-th so another message may be sent for this peer! */
2675 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Timeout on notify connect!\n");
2682 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2683 _("Failed to connect to `%4s': transport failed to connect\n"),
2684 GNUNET_i2s (&n->peer));
2687 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2688 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2689 GNUNET_i2s (&n->peer));
2690 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2691 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2692 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (&set_key_retry_task,
2699 * Handle CORE_REQUEST_CONNECT request.
2702 * @param client the client issuing the request
2703 * @param message the "struct ConnectMessage"
2706 handle_client_request_connect (void *cls,
2707 struct GNUNET_SERVER_Client *client,
2708 const struct GNUNET_MessageHeader *message)
2710 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2711 struct Neighbour *n;
2712 struct GNUNET_TIME_Relative timeout;
2714 if (0 == memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2717 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2720 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2721 n = find_neighbour (&cm->peer);
2723 n = create_neighbour (&cm->peer);
2724 if ( (GNUNET_YES == n->is_connected) ||
2727 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2728 "Core received `%s' request for `%4s', already connected!\n",
2730 GNUNET_i2s (&cm->peer));
2731 return; /* already connected, or at least trying */
2733 GNUNET_STATISTICS_update (stats, gettext_noop ("# connection requests received"), 1, GNUNET_NO);
2735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2736 "Core received `%s' request for `%4s', will try to establish connection\n",
2738 GNUNET_i2s (&cm->peer));
2740 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2741 /* ask transport to connect to the peer */
2742 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2744 sizeof (struct GNUNET_MessageHeader), 0,
2746 ¬ify_transport_connect_done,
2748 GNUNET_break (NULL != n->th);
2753 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2754 * the neighbour's struct and retry send_key. Or, if we did not get a
2755 * HELLO, just do nothing.
2757 * @param cls the 'struct Neighbour' to retry sending the key for
2758 * @param peer the peer for which this is the HELLO
2759 * @param hello HELLO message of that peer
2762 process_hello_retry_send_key (void *cls,
2763 const struct GNUNET_PeerIdentity *peer,
2764 const struct GNUNET_HELLO_Message *hello)
2766 struct Neighbour *n = cls;
2771 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2772 "Entered `%s' and `%s' is NULL!\n",
2773 "process_hello_retry_send_key",
2777 if (n->public_key != NULL)
2779 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2781 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2782 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2784 GNUNET_STATISTICS_update (stats,
2785 gettext_noop ("# SET_KEY messages deferred (need public key)"),
2793 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2794 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
2795 GNUNET_i2s (&n->peer));
2797 GNUNET_STATISTICS_update (stats,
2798 gettext_noop ("# Delayed connecting due to lack of public key"),
2801 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2802 n->retry_set_key_task
2803 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2804 &set_key_retry_task, n);
2810 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2811 "Entered `%s' for peer `%4s'\n",
2812 "process_hello_retry_send_key",
2815 if (n->public_key != NULL)
2817 /* already have public key, why are we here? */
2823 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2824 "Received new `%s' message for `%4s', initiating key exchange.\n",
2829 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2830 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2832 GNUNET_STATISTICS_update (stats,
2833 gettext_noop ("# Error extracting public key from HELLO"),
2836 GNUNET_free (n->public_key);
2837 n->public_key = NULL;
2839 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2840 "GNUNET_HELLO_get_key returned awfully\n");
2848 * Send our key (and encrypted PING) to the other peer.
2850 * @param n the other peer
2853 send_key (struct Neighbour *n)
2855 struct MessageEntry *pos;
2856 struct SetKeyMessage *sm;
2857 struct MessageEntry *me;
2858 struct PingMessage pp;
2859 struct PingMessage *pm;
2860 struct GNUNET_CRYPTO_AesInitializationVector iv;
2862 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2864 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2865 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2867 if (n->pitr != NULL)
2870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2871 "Key exchange in progress with `%4s'.\n",
2872 GNUNET_i2s (&n->peer));
2874 return; /* already in progress */
2876 if (GNUNET_YES != n->is_connected)
2879 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2880 "Not yet connected to peer `%4s'!\n",
2881 GNUNET_i2s (&n->peer));
2885 GNUNET_STATISTICS_update (stats,
2886 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
2889 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2891 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
2893 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2894 ¬ify_encrypted_transmit_ready,
2900 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2901 "Asked to perform key exchange with `%4s'.\n",
2902 GNUNET_i2s (&n->peer));
2904 if (n->public_key == NULL)
2906 /* lookup n's public key, then try again */
2908 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2909 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2910 GNUNET_i2s (&n->peer));
2912 GNUNET_assert (n->pitr == NULL);
2913 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
2915 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2916 &process_hello_retry_send_key, n);
2919 pos = n->encrypted_head;
2922 if (GNUNET_YES == pos->is_setkey)
2924 if (pos->sender_status == n->status)
2927 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2928 "`%s' message for `%4s' queued already\n",
2930 GNUNET_i2s (&n->peer));
2932 goto trigger_processing;
2934 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
2939 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2940 "Removing queued `%s' message for `%4s', will create a new one\n",
2942 GNUNET_i2s (&n->peer));
2952 case PEER_STATE_DOWN:
2953 n->status = PEER_STATE_KEY_SENT;
2955 case PEER_STATE_KEY_SENT:
2957 case PEER_STATE_KEY_RECEIVED:
2959 case PEER_STATE_KEY_CONFIRMED:
2967 /* first, set key message */
2968 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2969 sizeof (struct SetKeyMessage) +
2970 sizeof (struct PingMessage));
2971 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
2972 me->priority = SET_KEY_PRIORITY;
2973 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
2974 me->is_setkey = GNUNET_YES;
2975 me->got_slack = GNUNET_YES; /* do not defer this one! */
2976 me->sender_status = n->status;
2977 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2981 sm = (struct SetKeyMessage *) &me[1];
2982 sm->header.size = htons (sizeof (struct SetKeyMessage));
2983 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
2984 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
2985 PEER_STATE_KEY_SENT : n->status));
2987 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2988 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2989 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2990 sizeof (struct GNUNET_PeerIdentity));
2991 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
2992 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
2993 sm->target = n->peer;
2994 GNUNET_assert (GNUNET_OK ==
2995 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
2997 GNUNET_CRYPTO_AesSessionKey),
2999 &sm->encrypted_key));
3000 GNUNET_assert (GNUNET_OK ==
3001 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
3003 pm = (struct PingMessage *) &sm[1];
3004 pm->header.size = htons (sizeof (struct PingMessage));
3005 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
3006 pm->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3007 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
3008 pp.challenge = n->ping_challenge;
3009 pp.target = n->peer;
3011 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3012 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
3014 (unsigned int) n->ping_challenge,
3015 GNUNET_i2s (&n->peer),
3016 (unsigned int) n->encrypt_key.crc32,
3017 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3024 sizeof (struct PingMessage) -
3025 ((void *) &pm->target - (void *) pm));
3026 GNUNET_STATISTICS_update (stats,
3027 gettext_noop ("# SET_KEY and PING messages created"),
3031 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3032 "Have %llu ms left for `%s' transmission.\n",
3033 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).rel_value,
3037 /* trigger queue processing */
3038 process_encrypted_neighbour_queue (n);
3039 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
3040 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
3041 n->retry_set_key_task
3042 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3043 &set_key_retry_task, n);
3048 * We received a SET_KEY message. Validate and update
3049 * our key material and status.
3051 * @param n the neighbour from which we received message m
3052 * @param m the set key message we received
3055 handle_set_key (struct Neighbour *n,
3056 const struct SetKeyMessage *m);
3060 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3061 * the neighbour's struct and retry handling the set_key message. Or,
3062 * if we did not get a HELLO, just free the set key message.
3064 * @param cls pointer to the set key message
3065 * @param peer the peer for which this is the HELLO
3066 * @param hello HELLO message of that peer
3069 process_hello_retry_handle_set_key (void *cls,
3070 const struct GNUNET_PeerIdentity *peer,
3071 const struct GNUNET_HELLO_Message *hello)
3073 struct Neighbour *n = cls;
3074 struct SetKeyMessage *sm = n->skm;
3080 if (n->public_key != NULL)
3083 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3084 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
3086 GNUNET_i2s (&n->peer),
3089 handle_set_key (n, sm);
3093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3094 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
3096 GNUNET_i2s (&n->peer));
3101 if (n->public_key != NULL)
3102 return; /* multiple HELLOs match!? */
3104 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3105 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3107 GNUNET_break_op (0);
3108 GNUNET_free (n->public_key);
3109 n->public_key = NULL;
3115 * We received a PING message. Validate and transmit
3118 * @param n sender of the PING
3119 * @param m the encrypted PING message itself
3122 handle_ping (struct Neighbour *n, const struct PingMessage *m)
3124 struct PingMessage t;
3125 struct PongMessage tx;
3126 struct PongMessage *tp;
3127 struct MessageEntry *me;
3128 struct GNUNET_CRYPTO_AesInitializationVector iv;
3131 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3132 "Core service receives `%s' request from `%4s'.\n",
3133 "PING", GNUNET_i2s (&n->peer));
3135 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3141 sizeof (struct PingMessage) -
3142 ((void *) &m->target - (void *) m)))
3145 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3146 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
3148 GNUNET_i2s (&t.target),
3149 (unsigned int) t.challenge,
3150 (unsigned int) n->decrypt_key.crc32,
3151 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3154 GNUNET_STATISTICS_update (stats,
3155 gettext_noop ("# PING messages decrypted"),
3158 if (0 != memcmp (&t.target,
3159 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3161 GNUNET_break_op (0);
3164 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3165 sizeof (struct PongMessage));
3166 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3170 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
3171 me->priority = PONG_PRIORITY;
3172 me->size = sizeof (struct PongMessage);
3173 tx.inbound_bw_limit = n->bw_in;
3174 tx.challenge = t.challenge;
3175 tx.target = t.target;
3176 tp = (struct PongMessage *) &me[1];
3177 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
3178 tp->header.size = htons (sizeof (struct PongMessage));
3179 tp->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3180 derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
3185 sizeof (struct PongMessage) -
3186 ((void *) &tp->challenge - (void *) tp));
3187 GNUNET_STATISTICS_update (stats,
3188 gettext_noop ("# PONG messages created"),
3192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3193 "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
3195 (unsigned int) t.challenge,
3196 (unsigned int) n->encrypt_key.crc32,
3197 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3200 /* trigger queue processing */
3201 process_encrypted_neighbour_queue (n);
3206 * We received a PONG message. Validate and update our status.
3208 * @param n sender of the PONG
3209 * @param m the encrypted PONG message itself
3212 handle_pong (struct Neighbour *n,
3213 const struct PongMessage *m)
3215 struct PongMessage t;
3216 struct ConnectNotifyMessage cnm;
3217 struct GNUNET_CRYPTO_AesInitializationVector iv;
3220 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3221 "Core service receives `%s' response from `%4s'.\n",
3222 "PONG", GNUNET_i2s (&n->peer));
3224 /* mark as garbage, just to be sure */
3225 memset (&t, 255, sizeof (t));
3226 derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
3233 sizeof (struct PongMessage) -
3234 ((void *) &m->challenge - (void *) m)))
3236 GNUNET_break_op (0);
3239 GNUNET_STATISTICS_update (stats,
3240 gettext_noop ("# PONG messages decrypted"),
3244 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3245 "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
3247 GNUNET_i2s (&t.target),
3248 (unsigned int) t.challenge,
3249 (unsigned int) n->decrypt_key.crc32,
3250 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3253 if ((0 != memcmp (&t.target,
3255 sizeof (struct GNUNET_PeerIdentity))) ||
3256 (n->ping_challenge != t.challenge))
3258 /* PONG malformed */
3260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3261 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
3263 GNUNET_i2s (&n->peer),
3264 (unsigned int) n->ping_challenge);
3265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3266 "Received malformed `%s' received from `%4s' with challenge %u\n",
3267 "PONG", GNUNET_i2s (&t.target),
3268 (unsigned int) t.challenge);
3270 GNUNET_break_op (0);
3275 case PEER_STATE_DOWN:
3276 GNUNET_break (0); /* should be impossible */
3278 case PEER_STATE_KEY_SENT:
3279 GNUNET_break (0); /* should be impossible, how did we decrypt? */
3281 case PEER_STATE_KEY_RECEIVED:
3282 GNUNET_STATISTICS_update (stats,
3283 gettext_noop ("# Session keys confirmed via PONG"),
3286 n->status = PEER_STATE_KEY_CONFIRMED;
3287 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
3289 n->bw_out_external_limit = t.inbound_bw_limit;
3290 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3291 n->bw_out_internal_limit);
3292 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3294 GNUNET_TRANSPORT_set_quota (transport,
3298 GNUNET_TIME_UNIT_FOREVER_REL,
3302 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3303 "Confirmed key via `%s' message for peer `%4s'\n",
3304 "PONG", GNUNET_i2s (&n->peer));
3306 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3308 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3309 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3311 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
3312 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
3314 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
3315 process_encrypted_neighbour_queue (n);
3317 case PEER_STATE_KEY_CONFIRMED:
3318 n->last_activity = GNUNET_TIME_absolute_get ();
3319 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3320 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3322 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3325 handle_peer_status_change (n);
3335 * We received a SET_KEY message. Validate and update
3336 * our key material and status.
3338 * @param n the neighbour from which we received message m
3339 * @param m the set key message we received
3342 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
3344 struct SetKeyMessage *m_cpy;
3345 struct GNUNET_TIME_Absolute t;
3346 struct GNUNET_CRYPTO_AesSessionKey k;
3347 struct PingMessage *ping;
3348 struct PongMessage *pong;
3349 enum PeerStateMachine sender_status;
3352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3353 "Core service receives `%s' request from `%4s'.\n",
3354 "SET_KEY", GNUNET_i2s (&n->peer));
3356 if (n->public_key == NULL)
3358 if (n->pitr != NULL)
3361 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3362 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3369 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3371 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3372 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3373 /* lookup n's public key, then try again */
3374 GNUNET_assert (n->skm == NULL);
3376 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3378 GNUNET_TIME_UNIT_MINUTES,
3379 &process_hello_retry_handle_set_key, n);
3380 GNUNET_STATISTICS_update (stats,
3381 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3386 if (0 != memcmp (&m->target,
3388 sizeof (struct GNUNET_PeerIdentity)))
3390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3391 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3393 GNUNET_i2s (&m->target));
3396 if ((ntohl (m->purpose.size) !=
3397 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3398 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3399 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3400 sizeof (struct GNUNET_PeerIdentity)) ||
3402 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3403 &m->purpose, &m->signature, n->public_key)))
3405 /* invalid signature */
3406 GNUNET_break_op (0);
3409 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3410 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3411 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3412 (t.abs_value < n->decrypt_key_created.abs_value))
3414 /* this could rarely happen due to massive re-ordering of
3415 messages on the network level, but is most likely either
3416 a bug or some adversary messing with us. Report. */
3417 GNUNET_break_op (0);
3421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3422 "Decrypting key material.\n");
3424 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3427 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3428 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3429 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3431 /* failed to decrypt !? */
3432 GNUNET_break_op (0);
3435 GNUNET_STATISTICS_update (stats,
3436 gettext_noop ("# SET_KEY messages decrypted"),
3440 if (n->decrypt_key_created.abs_value != t.abs_value)
3442 /* fresh key, reset sequence numbers */
3443 n->last_sequence_number_received = 0;
3444 n->last_packets_bitmap = 0;
3445 n->decrypt_key_created = t;
3447 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3450 case PEER_STATE_DOWN:
3451 n->status = PEER_STATE_KEY_RECEIVED;
3453 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3454 "Responding to `%s' with my own key.\n", "SET_KEY");
3458 case PEER_STATE_KEY_SENT:
3459 case PEER_STATE_KEY_RECEIVED:
3460 n->status = PEER_STATE_KEY_RECEIVED;
3461 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3462 (sender_status != PEER_STATE_KEY_CONFIRMED))
3465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3466 "Responding to `%s' with my own key (other peer has status %u).\n",
3468 (unsigned int) sender_status);
3473 case PEER_STATE_KEY_CONFIRMED:
3474 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3475 (sender_status != PEER_STATE_KEY_CONFIRMED))
3478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3479 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3481 (unsigned int) sender_status);
3490 if (n->pending_ping != NULL)
3492 ping = n->pending_ping;
3493 n->pending_ping = NULL;
3494 handle_ping (n, ping);
3497 if (n->pending_pong != NULL)
3499 pong = n->pending_pong;
3500 n->pending_pong = NULL;
3501 handle_pong (n, pong);
3508 * Send a P2P message to a client.
3510 * @param sender who sent us the message?
3511 * @param client who should we give the message to?
3512 * @param m contains the message to transmit
3513 * @param msize number of bytes in buf to transmit
3516 send_p2p_message_to_client (struct Neighbour *sender,
3517 struct Client *client,
3518 const void *m, size_t msize)
3520 char buf[msize + sizeof (struct NotifyTrafficMessage)];
3521 struct NotifyTrafficMessage *ntm;
3524 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3525 "Core service passes message from `%4s' of type %u to client.\n",
3526 GNUNET_i2s(&sender->peer),
3527 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3529 ntm = (struct NotifyTrafficMessage *) buf;
3530 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
3531 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3532 ntm->ats_count = htonl (0);
3533 ntm->ats.type = htonl (0);
3534 ntm->ats.value = htonl (0);
3535 ntm->peer = sender->peer;
3536 memcpy (&ntm[1], m, msize);
3537 send_to_client (client, &ntm->header, GNUNET_YES);
3542 * Deliver P2P message to interested clients.
3544 * @param cls always NULL
3545 * @param client who sent us the message (struct Neighbour)
3546 * @param m the message
3549 deliver_message (void *cls,
3551 const struct GNUNET_MessageHeader *m)
3553 struct Neighbour *sender = client;
3554 size_t msize = ntohs (m->size);
3556 struct Client *cpos;
3562 type = ntohs (m->type);
3564 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3565 "Received encapsulated message of type %u and size %u from `%4s'\n",
3566 (unsigned int) type,
3568 GNUNET_i2s (&sender->peer));
3570 GNUNET_snprintf (buf,
3572 gettext_noop ("# bytes of messages of type %u received"),
3573 (unsigned int) type);
3574 GNUNET_STATISTICS_set (stats,
3578 dropped = GNUNET_YES;
3580 while (cpos != NULL)
3582 deliver_full = GNUNET_NO;
3583 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
3584 deliver_full = GNUNET_YES;
3587 for (tpos = 0; tpos < cpos->tcnt; tpos++)
3589 if (type != cpos->types[tpos])
3591 deliver_full = GNUNET_YES;
3595 if (GNUNET_YES == deliver_full)
3597 send_p2p_message_to_client (sender, cpos, m, msize);
3598 dropped = GNUNET_NO;
3600 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
3602 send_p2p_message_to_client (sender, cpos, m,
3603 sizeof (struct GNUNET_MessageHeader));
3607 if (dropped == GNUNET_YES)
3610 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3611 "Message of type %u from `%4s' not delivered to any client.\n",
3612 (unsigned int) type,
3613 GNUNET_i2s (&sender->peer));
3615 GNUNET_STATISTICS_update (stats,
3616 gettext_noop ("# messages not delivered to any client"),
3623 * We received an encrypted message. Decrypt, validate and
3624 * pass on to the appropriate clients.
3627 handle_encrypted_message (struct Neighbour *n,
3628 const struct EncryptedMessage *m)
3630 size_t size = ntohs (m->header.size);
3632 struct EncryptedMessage *pt; /* plaintext */
3635 struct GNUNET_TIME_Absolute t;
3636 struct GNUNET_CRYPTO_AesInitializationVector iv;
3637 struct GNUNET_CRYPTO_AuthKey auth_key;
3640 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3641 "Core service receives `%s' request from `%4s'.\n",
3642 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
3645 derive_auth_key (&auth_key,
3648 n->decrypt_key_created);
3649 GNUNET_CRYPTO_hmac (&auth_key,
3650 &m->sequence_number,
3651 size - ENCRYPTED_HEADER_SIZE, &ph);
3653 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3654 "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
3655 (unsigned int) size - ENCRYPTED_HEADER_SIZE,
3656 GNUNET_CRYPTO_crc32_n (&m->sequence_number,
3657 size - ENCRYPTED_HEADER_SIZE),
3661 if (0 != memcmp (&ph,
3663 sizeof (GNUNET_HashCode)))
3665 /* checksum failed */
3666 GNUNET_break_op (0);
3669 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3674 &m->sequence_number,
3675 &buf[ENCRYPTED_HEADER_SIZE],
3676 size - ENCRYPTED_HEADER_SIZE))
3678 pt = (struct EncryptedMessage *) buf;
3680 /* validate sequence number */
3681 snum = ntohl (pt->sequence_number);
3682 if (n->last_sequence_number_received == snum)
3684 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3685 "Received duplicate message, ignoring.\n");
3686 /* duplicate, ignore */
3687 GNUNET_STATISTICS_set (stats,
3688 gettext_noop ("# bytes dropped (duplicates)"),
3693 if ((n->last_sequence_number_received > snum) &&
3694 (n->last_sequence_number_received - snum > 32))
3696 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3697 "Received ancient out of sequence message, ignoring.\n");
3698 /* ancient out of sequence, ignore */
3699 GNUNET_STATISTICS_set (stats,
3700 gettext_noop ("# bytes dropped (out of sequence)"),
3705 if (n->last_sequence_number_received > snum)
3707 unsigned int rotbit =
3708 1 << (n->last_sequence_number_received - snum - 1);
3709 if ((n->last_packets_bitmap & rotbit) != 0)
3711 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3712 "Received duplicate message, ignoring.\n");
3713 GNUNET_STATISTICS_set (stats,
3714 gettext_noop ("# bytes dropped (duplicates)"),
3717 /* duplicate, ignore */
3720 n->last_packets_bitmap |= rotbit;
3722 if (n->last_sequence_number_received < snum)
3724 int shift = (snum - n->last_sequence_number_received);
3725 if (shift >= 8 * sizeof(n->last_packets_bitmap))
3726 n->last_packets_bitmap = 0;
3728 n->last_packets_bitmap <<= shift;
3729 n->last_sequence_number_received = snum;
3732 /* check timestamp */
3733 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
3734 if (GNUNET_TIME_absolute_get_duration (t).rel_value > MAX_MESSAGE_AGE.rel_value)
3736 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3738 ("Message received far too old (%llu ms). Content ignored.\n"),
3739 GNUNET_TIME_absolute_get_duration (t).rel_value);
3740 GNUNET_STATISTICS_set (stats,
3741 gettext_noop ("# bytes dropped (ancient message)"),
3747 /* process decrypted message(s) */
3748 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
3750 #if DEBUG_CORE_SET_QUOTA
3751 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3752 "Received %u b/s as new inbound limit for peer `%4s'\n",
3753 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
3754 GNUNET_i2s (&n->peer));
3756 n->bw_out_external_limit = pt->inbound_bw_limit;
3757 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3758 n->bw_out_internal_limit);
3759 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3761 GNUNET_TRANSPORT_set_quota (transport,
3765 GNUNET_TIME_UNIT_FOREVER_REL,
3768 n->last_activity = GNUNET_TIME_absolute_get ();
3769 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3770 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3772 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3775 GNUNET_STATISTICS_set (stats,
3776 gettext_noop ("# bytes of payload decrypted"),
3777 size - sizeof (struct EncryptedMessage),
3779 handle_peer_status_change (n);
3780 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
3782 &buf[sizeof (struct EncryptedMessage)],
3783 size - sizeof (struct EncryptedMessage),
3784 GNUNET_YES, GNUNET_NO))
3785 GNUNET_break_op (0);
3790 * Function called by the transport for each received message.
3792 * @param cls closure
3793 * @param peer (claimed) identity of the other peer
3794 * @param message the message
3795 * @param latency estimated latency for communicating with the
3796 * given peer (round-trip)
3797 * @param distance in overlay hops, as given by transport plugin
3800 handle_transport_receive (void *cls,
3801 const struct GNUNET_PeerIdentity *peer,
3802 const struct GNUNET_MessageHeader *message,
3803 struct GNUNET_TIME_Relative latency,
3804 unsigned int distance)
3806 struct Neighbour *n;
3807 struct GNUNET_TIME_Absolute now;
3814 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3815 "Received message of type %u from `%4s', demultiplexing.\n",
3816 (unsigned int) ntohs (message->type),
3819 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3824 n = find_neighbour (peer);
3826 n = create_neighbour (peer);
3827 changed = GNUNET_YES; /* FIXME... */
3828 up = (n->status == PEER_STATE_KEY_CONFIRMED);
3829 type = ntohs (message->type);
3830 size = ntohs (message->size);
3833 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
3834 if (size != sizeof (struct SetKeyMessage))
3836 GNUNET_break_op (0);
3839 GNUNET_STATISTICS_update (stats, gettext_noop ("# session keys received"), 1, GNUNET_NO);
3840 handle_set_key (n, (const struct SetKeyMessage *) message);
3842 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3843 if (size < sizeof (struct EncryptedMessage) +
3844 sizeof (struct GNUNET_MessageHeader))
3846 GNUNET_break_op (0);
3849 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3850 (n->status != PEER_STATE_KEY_CONFIRMED))
3852 GNUNET_break_op (0);
3855 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3857 case GNUNET_MESSAGE_TYPE_CORE_PING:
3858 if (size != sizeof (struct PingMessage))
3860 GNUNET_break_op (0);
3863 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
3864 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3865 (n->status != PEER_STATE_KEY_CONFIRMED))
3868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3869 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3870 "PING", GNUNET_i2s (&n->peer));
3872 GNUNET_free_non_null (n->pending_ping);
3873 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3874 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3877 handle_ping (n, (const struct PingMessage *) message);
3879 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3880 if (size != sizeof (struct PongMessage))
3882 GNUNET_break_op (0);
3885 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
3886 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3887 (n->status != PEER_STATE_KEY_CONFIRMED) )
3890 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3891 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3892 "PONG", GNUNET_i2s (&n->peer));
3894 GNUNET_free_non_null (n->pending_pong);
3895 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
3896 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
3899 handle_pong (n, (const struct PongMessage *) message);
3902 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3903 _("Unsupported message of type %u received.\n"),
3904 (unsigned int) type);
3907 if (n->status == PEER_STATE_KEY_CONFIRMED)
3909 now = GNUNET_TIME_absolute_get ();
3910 n->last_activity = now;
3911 changed = GNUNET_YES;
3914 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), 1, GNUNET_NO);
3915 n->time_established = now;
3917 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3918 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3920 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3925 handle_peer_status_change (n);
3930 * Function that recalculates the bandwidth quota for the
3931 * given neighbour and transmits it to the transport service.
3933 * @param cls neighbour for the quota update
3937 neighbour_quota_update (void *cls,
3938 const struct GNUNET_SCHEDULER_TaskContext *tc)
3940 struct Neighbour *n = cls;
3941 struct GNUNET_BANDWIDTH_Value32NBO q_in;
3944 unsigned long long distributable;
3945 uint64_t need_per_peer;
3946 uint64_t need_per_second;
3949 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3950 "Neighbour quota update calculation running for peer `%4s'\n",
3951 GNUNET_i2s (&n->peer));
3953 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
3954 /* calculate relative preference among all neighbours;
3955 divides by a bit more to avoid division by zero AND to
3956 account for possibility of new neighbours joining any time
3957 AND to convert to double... */
3958 if (preference_sum == 0)
3960 pref_rel = 1.0 / (double) neighbour_count;
3964 pref_rel = n->current_preference / preference_sum;
3966 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
3967 GNUNET_TIME_UNIT_SECONDS);
3968 need_per_second = need_per_peer * neighbour_count;
3970 if (bandwidth_target_out_bps > need_per_second)
3971 distributable = bandwidth_target_out_bps - need_per_second;
3972 share = distributable * pref_rel;
3973 if (share + need_per_peer > UINT32_MAX)
3974 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
3976 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
3977 /* check if we want to disconnect for good due to inactivity */
3978 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) &&
3979 (GNUNET_TIME_absolute_get_duration (n->time_established).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) )
3982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3983 "Forcing disconnect of `%4s' due to inactivity\n",
3984 GNUNET_i2s (&n->peer));
3986 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
3988 #if DEBUG_CORE_QUOTA
3989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3990 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
3991 GNUNET_i2s (&n->peer),
3992 (unsigned int) ntohl (q_in.value__),
3993 bandwidth_target_out_bps,
3994 (unsigned int) ntohl (n->bw_in.value__),
3995 (unsigned int) ntohl (n->bw_out.value__),
3996 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
3998 if (n->bw_in.value__ != q_in.value__)
4001 if (GNUNET_YES == n->is_connected)
4002 GNUNET_TRANSPORT_set_quota (transport,
4006 GNUNET_TIME_UNIT_FOREVER_REL,
4008 handle_peer_status_change (n);
4010 schedule_quota_update (n);
4015 * Function called by transport to notify us that
4016 * a peer connected to us (on the network level).
4018 * @param cls closure
4019 * @param peer the peer that connected
4020 * @param latency current latency of the connection
4021 * @param distance in overlay hops, as given by transport plugin
4024 handle_transport_notify_connect (void *cls,
4025 const struct GNUNET_PeerIdentity *peer,
4026 struct GNUNET_TIME_Relative latency,
4027 unsigned int distance)
4029 struct Neighbour *n;
4031 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4036 n = find_neighbour (peer);
4039 if (GNUNET_YES == n->is_connected)
4041 /* duplicate connect notification!? */
4048 n = create_neighbour (peer);
4050 GNUNET_STATISTICS_update (stats,
4051 gettext_noop ("# peers connected (transport)"),
4054 n->is_connected = GNUNET_YES;
4055 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
4058 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
4062 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4063 "Received connection from `%4s'.\n",
4064 GNUNET_i2s (&n->peer));
4066 GNUNET_TRANSPORT_set_quota (transport,
4070 GNUNET_TIME_UNIT_FOREVER_REL,
4077 * Function called by transport telling us that a peer
4080 * @param cls closure
4081 * @param peer the peer that disconnected
4084 handle_transport_notify_disconnect (void *cls,
4085 const struct GNUNET_PeerIdentity *peer)
4087 struct DisconnectNotifyMessage cnm;
4088 struct Neighbour *n;
4089 struct ClientActiveRequest *car;
4090 struct GNUNET_TIME_Relative left;
4093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4094 "Peer `%4s' disconnected from us; received notification from transport.\n", GNUNET_i2s (peer));
4097 n = find_neighbour (peer);
4103 GNUNET_break (n->is_connected);
4104 if (n->status == PEER_STATE_KEY_CONFIRMED)
4106 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
4107 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
4109 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
4111 n->is_connected = GNUNET_NO;
4112 while (NULL != (car = n->active_client_request_head))
4114 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
4115 n->active_client_request_tail,
4117 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
4118 &n->peer.hashPubKey,
4123 GNUNET_STATISTICS_update (stats,
4124 gettext_noop ("# peers connected (transport)"),
4127 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
4128 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
4129 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4130 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
4131 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
4133 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
4134 &consider_free_task,
4140 * Last task run during shutdown. Disconnects us from
4144 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4146 struct Neighbour *n;
4150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4151 "Core service shutting down.\n");
4153 GNUNET_assert (transport != NULL);
4154 GNUNET_TRANSPORT_disconnect (transport);
4156 while (NULL != (n = neighbours))
4158 neighbours = n->next;
4159 GNUNET_assert (neighbour_count > 0);
4163 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
4164 GNUNET_SERVER_notification_context_destroy (notifier);
4166 while (NULL != (c = clients))
4167 handle_client_disconnect (NULL, c->client_handle);
4168 if (my_private_key != NULL)
4169 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4171 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4172 if (peerinfo != NULL)
4173 GNUNET_PEERINFO_disconnect (peerinfo);
4175 GNUNET_SERVER_mst_destroy (mst);
4180 * Initiate core service.
4182 * @param cls closure
4183 * @param server the initialized server
4184 * @param c configuration to use
4188 struct GNUNET_SERVER_Handle *server,
4189 const struct GNUNET_CONFIGURATION_Handle *c)
4191 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4192 {&handle_client_init, NULL,
4193 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
4194 {&handle_client_request_info, NULL,
4195 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
4196 sizeof (struct RequestInfoMessage)},
4197 {&handle_client_send_request, NULL,
4198 GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST,
4199 sizeof (struct SendMessageRequest)},
4200 {&handle_client_send, NULL,
4201 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
4202 {&handle_client_request_connect, NULL,
4203 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
4204 sizeof (struct ConnectMessage)},
4210 /* parse configuration */
4213 GNUNET_CONFIGURATION_get_value_number (c,
4216 &bandwidth_target_in_bps)) ||
4218 GNUNET_CONFIGURATION_get_value_number (c,
4221 &bandwidth_target_out_bps)) ||
4223 GNUNET_CONFIGURATION_get_value_filename (c,
4225 "HOSTKEY", &keyfile)))
4227 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4229 ("Core service is lacking key configuration settings. Exiting.\n"));
4230 GNUNET_SCHEDULER_shutdown ();
4233 peerinfo = GNUNET_PEERINFO_connect (cfg);
4234 if (NULL == peerinfo)
4236 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4237 _("Could not access PEERINFO service. Exiting.\n"));
4238 GNUNET_SCHEDULER_shutdown ();
4239 GNUNET_free (keyfile);
4242 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4243 GNUNET_free (keyfile);
4244 if (my_private_key == NULL)
4246 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4247 _("Core service could not access hostkey. Exiting.\n"));
4248 GNUNET_PEERINFO_disconnect (peerinfo);
4249 GNUNET_SCHEDULER_shutdown ();
4252 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4253 GNUNET_CRYPTO_hash (&my_public_key,
4254 sizeof (my_public_key), &my_identity.hashPubKey);
4255 /* setup notification */
4256 notifier = GNUNET_SERVER_notification_context_create (server,
4258 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
4259 /* setup transport connection */
4260 transport = GNUNET_TRANSPORT_connect (cfg,
4263 &handle_transport_receive,
4264 &handle_transport_notify_connect,
4265 &handle_transport_notify_disconnect);
4266 GNUNET_assert (NULL != transport);
4267 stats = GNUNET_STATISTICS_create ("core", cfg);
4269 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded CORE_SEND requests"), 0, GNUNET_NO);
4270 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 0, GNUNET_NO);
4272 mst = GNUNET_SERVER_mst_create (&deliver_message,
4274 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
4275 &cleaning_task, NULL);
4276 /* process client requests */
4277 GNUNET_SERVER_add_handlers (server, handlers);
4278 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4279 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
4285 * The main function for the transport service.
4287 * @param argc number of arguments from the command line
4288 * @param argv command line arguments
4289 * @return 0 ok, 1 on error
4292 main (int argc, char *const *argv)
4294 return (GNUNET_OK ==
4295 GNUNET_SERVICE_run (argc,
4298 GNUNET_SERVICE_OPTION_NONE,
4299 &run, NULL)) ? 0 : 1;
4302 /* end of gnunet-service-core.c */