2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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22 * @file core/gnunet-service-core.c
23 * @brief high-level P2P messaging
24 * @author Christian Grothoff
26 * Considerations for later:
27 * - check that hostkey used by transport (for HELLOs) is the
28 * same as the hostkey that we are using!
29 * - add code to send PINGs if we are about to time-out otherwise
30 * - optimize lookup (many O(n) list traversals
31 * could ideally be changed to O(1) hash map lookups)
34 #include "gnunet_constants.h"
35 #include "gnunet_util_lib.h"
36 #include "gnunet_hello_lib.h"
37 #include "gnunet_peerinfo_service.h"
38 #include "gnunet_protocols.h"
39 #include "gnunet_signatures.h"
40 #include "gnunet_statistics_service.h"
41 #include "gnunet_transport_service.h"
45 #define DEBUG_HANDSHAKE GNUNET_NO
47 #define DEBUG_CORE_QUOTA GNUNET_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)
1036 #if DEBUG_CORE_CLIENT
1037 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1038 "Not considering client transmission requests: queue full\n");
1040 return; /* queue still full */
1042 /* find highest priority request */
1043 pos = n->active_client_request_head;
1047 if ( (car == NULL) ||
1048 (pos->priority > car->priority) )
1053 return; /* no pending requests */
1054 #if DEBUG_CORE_CLIENT
1055 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1056 "Permitting client transmission request to `%s'\n",
1057 GNUNET_i2s (&n->peer));
1060 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1061 n->active_client_request_tail,
1063 GNUNET_CONTAINER_multihashmap_remove (c->requests,
1064 &n->peer.hashPubKey,
1066 smr.header.size = htons (sizeof (struct SendMessageReady));
1067 smr.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_READY);
1068 smr.size = htons (car->msize);
1069 smr.smr_id = car->smr_id;
1071 send_to_client (c, &smr.header, GNUNET_NO);
1077 * Handle CORE_SEND_REQUEST message.
1080 handle_client_send_request (void *cls,
1081 struct GNUNET_SERVER_Client *client,
1082 const struct GNUNET_MessageHeader *message)
1084 const struct SendMessageRequest *req;
1085 struct Neighbour *n;
1087 struct ClientActiveRequest *car;
1089 req = (const struct SendMessageRequest*) message;
1090 n = find_neighbour (&req->peer);
1092 (GNUNET_YES != n->is_connected) ||
1093 (n->status != PEER_STATE_KEY_CONFIRMED) )
1095 /* neighbour must have disconnected since request was issued,
1096 ignore (client will realize it once it processes the
1097 disconnect notification) */
1098 #if DEBUG_CORE_CLIENT
1099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1100 "Dropped client request for transmission (am disconnected)\n");
1102 GNUNET_STATISTICS_update (stats,
1103 gettext_noop ("# send requests dropped (disconnected)"),
1106 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1110 while ( (c != NULL) &&
1111 (c->client_handle != client) )
1115 /* client did not send INIT first! */
1117 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1120 if (c->requests == NULL)
1121 c->requests = GNUNET_CONTAINER_multihashmap_create (16);
1122 #if DEBUG_CORE_CLIENT
1123 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1124 "Received client transmission request. queueing\n");
1126 car = GNUNET_CONTAINER_multihashmap_get (c->requests,
1127 &req->peer.hashPubKey);
1130 /* create new entry */
1131 car = GNUNET_malloc (sizeof (struct ClientActiveRequest));
1132 GNUNET_assert (GNUNET_OK ==
1133 GNUNET_CONTAINER_multihashmap_put (c->requests,
1134 &req->peer.hashPubKey,
1136 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
1137 GNUNET_CONTAINER_DLL_insert (n->active_client_request_head,
1138 n->active_client_request_tail,
1142 car->deadline = GNUNET_TIME_absolute_ntoh (req->deadline);
1143 car->priority = ntohl (req->priority);
1144 car->queue_size = ntohl (req->queue_size);
1145 car->msize = ntohs (req->size);
1146 car->smr_id = req->smr_id;
1147 schedule_peer_messages (n);
1148 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1153 * Handle CORE_INIT request.
1156 handle_client_init (void *cls,
1157 struct GNUNET_SERVER_Client *client,
1158 const struct GNUNET_MessageHeader *message)
1160 const struct InitMessage *im;
1161 struct InitReplyMessage irm;
1164 const uint16_t *types;
1166 struct Neighbour *n;
1167 struct ConnectNotifyMessage cnm;
1170 #if DEBUG_CORE_CLIENT
1171 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1172 "Client connecting to core service with `%s' message\n",
1175 /* check that we don't have an entry already */
1179 if (client == c->client_handle)
1182 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1187 msize = ntohs (message->size);
1188 if (msize < sizeof (struct InitMessage))
1191 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1194 GNUNET_SERVER_notification_context_add (notifier, client);
1195 im = (const struct InitMessage *) message;
1196 types = (const uint16_t *) &im[1];
1197 msize -= sizeof (struct InitMessage);
1198 c = GNUNET_malloc (sizeof (struct Client) + msize);
1199 c->client_handle = client;
1202 c->tcnt = msize / sizeof (uint16_t);
1203 c->types = (const uint16_t *) &c[1];
1204 wtypes = (uint16_t *) &c[1];
1205 for (i=0;i<c->tcnt;i++)
1206 wtypes[i] = ntohs (types[i]);
1207 c->options = ntohl (im->options);
1208 #if DEBUG_CORE_CLIENT
1209 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1210 "Client %p is interested in %u message types\n",
1212 (unsigned int) c->tcnt);
1214 /* send init reply message */
1215 irm.header.size = htons (sizeof (struct InitReplyMessage));
1216 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
1217 irm.reserved = htonl (0);
1218 memcpy (&irm.publicKey,
1220 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1221 #if DEBUG_CORE_CLIENT
1222 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1223 "Sending `%s' message to client.\n", "INIT_REPLY");
1225 send_to_client (c, &irm.header, GNUNET_NO);
1226 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
1228 /* notify new client about existing neighbours */
1229 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
1230 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1231 cnm.ats_count = htonl (0);
1232 cnm.ats.type = htonl (0);
1233 cnm.ats.value = htonl (0);
1237 if (n->status == PEER_STATE_KEY_CONFIRMED)
1239 #if DEBUG_CORE_CLIENT
1240 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1241 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
1244 send_to_client (c, &cnm.header, GNUNET_NO);
1249 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1254 * Free client request records.
1257 * @param key identity of peer for which this is an active request
1258 * @param value the 'struct ClientActiveRequest' to free
1259 * @return GNUNET_YES (continue iteration)
1262 destroy_active_client_request (void *cls,
1263 const GNUNET_HashCode *key,
1266 struct ClientActiveRequest *car = value;
1267 struct Neighbour *n;
1268 struct GNUNET_PeerIdentity peer;
1270 peer.hashPubKey = *key;
1271 n = find_neighbour (&peer);
1272 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1273 n->active_client_request_tail,
1281 * A client disconnected, clean up.
1283 * @param cls closure
1284 * @param client identification of the client
1287 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
1290 struct Client *prev;
1294 #if DEBUG_CORE_CLIENT
1295 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1296 "Client %p has disconnected from core service.\n",
1303 if (client == pos->client_handle)
1310 /* client never sent INIT */
1314 clients = pos->next;
1316 prev->next = pos->next;
1317 if (pos->requests != NULL)
1319 GNUNET_CONTAINER_multihashmap_iterate (pos->requests,
1320 &destroy_active_client_request,
1322 GNUNET_CONTAINER_multihashmap_destroy (pos->requests);
1329 * Handle CORE_ITERATE_PEERS request.
1332 handle_client_iterate_peers (void *cls,
1333 struct GNUNET_SERVER_Client *client,
1334 const struct GNUNET_MessageHeader *message)
1337 struct Neighbour *n;
1338 struct ConnectNotifyMessage cnm;
1339 struct GNUNET_MessageHeader done_msg;
1340 struct GNUNET_SERVER_TransmitContext *tc;
1342 /* notify new client about existing neighbours */
1343 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
1344 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1345 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1346 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1347 tc = GNUNET_SERVER_transmit_context_create (client);
1349 cnm.ats_count = htonl (0);
1350 cnm.ats.type = htonl (0);
1351 cnm.ats.value = htonl (0);
1354 if (n->status == PEER_STATE_KEY_CONFIRMED)
1356 #if DEBUG_CORE_CLIENT
1357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1358 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
1361 GNUNET_SERVER_transmit_context_append_message (tc, &cnm.header);
1365 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
1366 GNUNET_SERVER_transmit_context_run (tc,
1367 GNUNET_TIME_UNIT_FOREVER_REL);
1372 * Handle REQUEST_INFO request.
1375 handle_client_request_info (void *cls,
1376 struct GNUNET_SERVER_Client *client,
1377 const struct GNUNET_MessageHeader *message)
1379 const struct RequestInfoMessage *rcm;
1381 struct Neighbour *n;
1382 struct ConfigurationInfoMessage cim;
1383 int32_t want_reserv;
1385 unsigned long long old_preference;
1387 #if DEBUG_CORE_CLIENT
1388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1389 "Core service receives `%s' request.\n", "REQUEST_INFO");
1394 if (client == pos->client_handle)
1401 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1405 rcm = (const struct RequestInfoMessage *) message;
1406 n = find_neighbour (&rcm->peer);
1407 memset (&cim, 0, sizeof (cim));
1410 want_reserv = ntohl (rcm->reserve_inbound);
1411 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1413 n->bw_out_internal_limit = rcm->limit_outbound;
1414 if (n->bw_out.value__ != GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1415 n->bw_out_external_limit).value__)
1417 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1418 n->bw_out_external_limit);
1419 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1421 GNUNET_TRANSPORT_set_quota (transport,
1425 GNUNET_TIME_UNIT_FOREVER_REL,
1427 handle_peer_status_change (n);
1430 if (want_reserv < 0)
1432 got_reserv = want_reserv;
1434 else if (want_reserv > 0)
1436 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1437 want_reserv).rel_value == 0)
1438 got_reserv = want_reserv;
1440 got_reserv = 0; /* all or nothing */
1444 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1446 old_preference = n->current_preference;
1447 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1448 if (old_preference > n->current_preference)
1450 /* overflow; cap at maximum value */
1451 n->current_preference = ULLONG_MAX;
1453 update_preference_sum (n->current_preference - old_preference);
1454 #if DEBUG_CORE_QUOTA
1455 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1456 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1458 GNUNET_i2s (&rcm->peer),
1461 cim.reserved_amount = htonl (got_reserv);
1462 cim.rim_id = rcm->rim_id;
1463 cim.bw_out = n->bw_out;
1464 cim.preference = n->current_preference;
1466 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1467 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1468 cim.peer = rcm->peer;
1469 #if DEBUG_CORE_CLIENT
1470 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1471 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1473 send_to_client (pos, &cim.header, GNUNET_NO);
1474 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1479 * Free the given entry for the neighbour (it has
1480 * already been removed from the list at this point).
1482 * @param n neighbour to free
1485 free_neighbour (struct Neighbour *n)
1487 struct MessageEntry *m;
1488 struct ClientActiveRequest *car;
1491 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1492 "Destroying neighbour entry for peer `%4s'\n",
1493 GNUNET_i2s (&n->peer));
1495 if (n->pitr != NULL)
1497 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1502 GNUNET_free (n->skm);
1505 while (NULL != (m = n->messages))
1507 n->messages = m->next;
1510 while (NULL != (m = n->encrypted_head))
1512 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1517 while (NULL != (car = n->active_client_request_head))
1519 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1520 n->active_client_request_tail,
1522 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
1523 &n->peer.hashPubKey,
1529 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1532 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1533 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
1534 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1535 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
1536 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1537 GNUNET_SCHEDULER_cancel (n->quota_update_task);
1538 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1539 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1540 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1541 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
1542 if (n->status == PEER_STATE_KEY_CONFIRMED)
1543 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), -1, GNUNET_NO);
1544 GNUNET_free_non_null (n->public_key);
1545 GNUNET_free_non_null (n->pending_ping);
1546 GNUNET_free_non_null (n->pending_pong);
1552 * Check if we have encrypted messages for the specified neighbour
1553 * pending, and if so, check with the transport about sending them
1556 * @param n neighbour to check.
1558 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1562 * Encrypt size bytes from in and write the result to out. Use the
1563 * key for outbound traffic of the given neighbour.
1565 * @param n neighbour we are sending to
1566 * @param iv initialization vector to use
1567 * @param in ciphertext
1568 * @param out plaintext
1569 * @param size size of in/out
1570 * @return GNUNET_OK on success
1573 do_encrypt (struct Neighbour *n,
1574 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1575 const void *in, void *out, size_t size)
1577 if (size != (uint16_t) size)
1582 GNUNET_assert (size ==
1583 GNUNET_CRYPTO_aes_encrypt (in,
1587 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1590 "Encrypted %u bytes for `%4s' using key %u, IV %u\n",
1591 (unsigned int) size,
1592 GNUNET_i2s (&n->peer),
1593 (unsigned int) n->encrypt_key.crc32,
1594 GNUNET_CRYPTO_crc32_n (iv, sizeof(iv)));
1601 * Consider freeing the given neighbour since we may not need
1602 * to keep it around anymore.
1604 * @param n neighbour to consider discarding
1607 consider_free_neighbour (struct Neighbour *n);
1611 * Task triggered when a neighbour entry is about to time out
1612 * (and we should prevent this by sending a PING).
1614 * @param cls the 'struct Neighbour'
1615 * @param tc scheduler context (not used)
1618 send_keep_alive (void *cls,
1619 const struct GNUNET_SCHEDULER_TaskContext *tc)
1621 struct Neighbour *n = cls;
1622 struct GNUNET_TIME_Relative retry;
1623 struct GNUNET_TIME_Relative left;
1624 struct MessageEntry *me;
1625 struct PingMessage pp;
1626 struct PingMessage *pm;
1627 struct GNUNET_CRYPTO_AesInitializationVector iv;
1629 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1631 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1632 sizeof (struct PingMessage));
1633 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1634 me->priority = PING_PRIORITY;
1635 me->size = sizeof (struct PingMessage);
1636 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1640 pm = (struct PingMessage *) &me[1];
1641 pm->header.size = htons (sizeof (struct PingMessage));
1642 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1643 pm->iv_seed = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1645 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
1646 pp.challenge = n->ping_challenge;
1647 pp.target = n->peer;
1649 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1650 "Encrypting `%s' message with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
1652 (unsigned int) n->ping_challenge,
1653 GNUNET_i2s (&n->peer),
1654 (unsigned int) n->encrypt_key.crc32,
1655 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
1662 sizeof (struct PingMessage) -
1663 ((void *) &pm->target - (void *) pm));
1664 process_encrypted_neighbour_queue (n);
1665 /* reschedule PING job */
1666 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1667 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1668 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1669 MIN_PING_FREQUENCY);
1671 = GNUNET_SCHEDULER_add_delayed (retry,
1679 * Task triggered when a neighbour entry might have gotten stale.
1681 * @param cls the 'struct Neighbour'
1682 * @param tc scheduler context (not used)
1685 consider_free_task (void *cls,
1686 const struct GNUNET_SCHEDULER_TaskContext *tc)
1688 struct Neighbour *n = cls;
1690 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1691 consider_free_neighbour (n);
1696 * Consider freeing the given neighbour since we may not need
1697 * to keep it around anymore.
1699 * @param n neighbour to consider discarding
1702 consider_free_neighbour (struct Neighbour *n)
1704 struct Neighbour *pos;
1705 struct Neighbour *prev;
1706 struct GNUNET_TIME_Relative left;
1708 if ( (n->th != NULL) ||
1709 (n->pitr != NULL) ||
1710 (GNUNET_YES == n->is_connected) )
1711 return; /* no chance */
1713 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1714 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1715 if (left.rel_value > 0)
1717 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1718 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1719 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (left,
1720 &consider_free_task,
1724 /* actually free the neighbour... */
1733 neighbours = n->next;
1735 prev->next = n->next;
1736 GNUNET_assert (neighbour_count > 0);
1738 GNUNET_STATISTICS_set (stats,
1739 gettext_noop ("# neighbour entries allocated"),
1747 * Function called when the transport service is ready to
1748 * receive an encrypted message for the respective peer
1750 * @param cls neighbour to use message from
1751 * @param size number of bytes we can transmit
1752 * @param buf where to copy the message
1753 * @return number of bytes transmitted
1756 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1758 struct Neighbour *n = cls;
1759 struct MessageEntry *m;
1764 m = n->encrypted_head;
1768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1769 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1770 GNUNET_i2s (&n->peer));
1774 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1781 GNUNET_assert (size >= m->size);
1782 memcpy (cbuf, &m[1], m->size);
1784 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1788 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1789 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1791 GNUNET_i2s (&n->peer));
1793 process_encrypted_neighbour_queue (n);
1798 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1799 "Transmission of message of type %u and size %u failed\n",
1800 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1801 (unsigned int) m->size);
1805 consider_free_neighbour (n);
1811 * Check if we have plaintext messages for the specified neighbour
1812 * pending, and if so, consider batching and encrypting them (and
1813 * then trigger processing of the encrypted queue if needed).
1815 * @param n neighbour to check.
1817 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1821 * Check if we have encrypted messages for the specified neighbour
1822 * pending, and if so, check with the transport about sending them
1825 * @param n neighbour to check.
1828 process_encrypted_neighbour_queue (struct Neighbour *n)
1830 struct MessageEntry *m;
1833 return; /* request already pending */
1834 m = n->encrypted_head;
1837 /* encrypted queue empty, try plaintext instead */
1838 process_plaintext_neighbour_queue (n);
1842 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1843 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1844 (unsigned int) m->size,
1845 GNUNET_i2s (&n->peer),
1846 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
1849 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1852 GNUNET_TIME_absolute_get_remaining
1854 ¬ify_encrypted_transmit_ready,
1858 /* message request too large or duplicate request */
1860 /* discard encrypted message */
1861 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1865 process_encrypted_neighbour_queue (n);
1871 * Decrypt size bytes from in and write the result to out. Use the
1872 * key for inbound traffic of the given neighbour. This function does
1873 * NOT do any integrity-checks on the result.
1875 * @param n neighbour we are receiving from
1876 * @param iv initialization vector to use
1877 * @param in ciphertext
1878 * @param out plaintext
1879 * @param size size of in/out
1880 * @return GNUNET_OK on success
1883 do_decrypt (struct Neighbour *n,
1884 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1885 const void *in, void *out, size_t size)
1887 if (size != (uint16_t) size)
1892 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1893 (n->status != PEER_STATE_KEY_CONFIRMED))
1895 GNUNET_break_op (0);
1896 return GNUNET_SYSERR;
1899 GNUNET_CRYPTO_aes_decrypt (in,
1906 return GNUNET_SYSERR;
1908 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes decrypted"), size, GNUNET_NO);
1910 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1911 "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
1912 (unsigned int) size,
1913 GNUNET_i2s (&n->peer),
1914 (unsigned int) n->decrypt_key.crc32,
1915 GNUNET_CRYPTO_crc32_n (iv, sizeof(*iv)));
1922 * Select messages for transmission. This heuristic uses a combination
1923 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1924 * and priority-based discard (in case no feasible schedule exist) and
1925 * speculative optimization (defer any kind of transmission until
1926 * we either create a batch of significant size, 25% of max, or until
1927 * we are close to a deadline). Furthermore, when scheduling the
1928 * heuristic also packs as many messages into the batch as possible,
1929 * starting with those with the earliest deadline. Yes, this is fun.
1931 * @param n neighbour to select messages from
1932 * @param size number of bytes to select for transmission
1933 * @param retry_time set to the time when we should try again
1934 * (only valid if this function returns zero)
1935 * @return number of bytes selected, or 0 if we decided to
1936 * defer scheduling overall; in that case, retry_time is set.
1939 select_messages (struct Neighbour *n,
1940 size_t size, struct GNUNET_TIME_Relative *retry_time)
1942 struct MessageEntry *pos;
1943 struct MessageEntry *min;
1944 struct MessageEntry *last;
1945 unsigned int min_prio;
1946 struct GNUNET_TIME_Absolute t;
1947 struct GNUNET_TIME_Absolute now;
1948 struct GNUNET_TIME_Relative delta;
1950 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
1953 unsigned int queue_size;
1954 int discard_low_prio;
1956 GNUNET_assert (NULL != n->messages);
1957 now = GNUNET_TIME_absolute_get ();
1958 /* last entry in linked list of messages processed */
1960 /* should we remove the entry with the lowest
1961 priority from consideration for scheduling at the
1972 discard_low_prio = GNUNET_YES;
1973 while (GNUNET_YES == discard_low_prio)
1976 min_prio = UINT_MAX;
1977 discard_low_prio = GNUNET_NO;
1978 /* calculate number of bytes available for transmission at time "t" */
1979 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
1981 /* how many bytes have we (hypothetically) scheduled so far */
1983 /* maximum time we can wait before transmitting anything
1984 and still make all of our deadlines */
1985 slack = GNUNET_TIME_UNIT_FOREVER_REL;
1987 /* note that we use "*2" here because we want to look
1988 a bit further into the future; much more makes no
1989 sense since new message might be scheduled in the
1991 while ((pos != NULL) && (off < size * 2))
1993 if (pos->do_transmit == GNUNET_YES)
1995 /* already removed from consideration */
1999 if (discard_low_prio == GNUNET_NO)
2001 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
2002 if (delta.rel_value > 0)
2004 // FIXME: HUH? Check!
2006 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
2009 if (avail < pos->size)
2011 // FIXME: HUH? Check!
2012 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
2017 /* update slack, considering both its absolute deadline
2018 and relative deadlines caused by other messages
2019 with their respective load */
2020 slack = GNUNET_TIME_relative_min (slack,
2021 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
2023 if (pos->deadline.abs_value <= now.abs_value)
2026 slack = GNUNET_TIME_UNIT_ZERO;
2028 else if (GNUNET_YES == pos->got_slack)
2030 /* should be soon now! */
2031 slack = GNUNET_TIME_relative_min (slack,
2032 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
2037 GNUNET_TIME_relative_min (slack,
2038 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
2039 pos->got_slack = GNUNET_YES;
2040 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
2041 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
2046 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
2047 if (pos->priority <= min_prio)
2049 /* update min for discard */
2050 min_prio = pos->priority;
2055 if (discard_low_prio)
2057 GNUNET_assert (min != NULL);
2058 /* remove lowest-priority entry from consideration */
2059 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
2063 /* guard against sending "tiny" messages with large headers without
2065 if ( (slack.rel_value > GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value) &&
2067 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
2069 /* less than 25% of message would be filled with deadlines still
2070 being met if we delay by one second or more; so just wait for
2071 more data; but do not wait longer than 1s (since we don't want
2072 to delay messages for a really long time either). */
2073 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
2074 /* reset do_transmit values for next time */
2077 pos->do_transmit = GNUNET_NO;
2080 GNUNET_STATISTICS_update (stats,
2081 gettext_noop ("# transmissions delayed due to corking"),
2084 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2085 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
2086 (unsigned long long) retry_time->rel_value,
2088 (unsigned int) size);
2092 /* select marked messages (up to size) for transmission */
2097 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
2099 pos->do_transmit = GNUNET_YES; /* mark for transmission */
2103 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2104 "Selecting message of size %u for transmission\n",
2105 (unsigned int) pos->size);
2111 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2112 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
2113 (unsigned int) pos->size,
2116 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
2121 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2122 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
2123 (unsigned long long) off, (unsigned long long) tsize,
2124 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
2125 GNUNET_i2s (&n->peer));
2132 * Batch multiple messages into a larger buffer.
2134 * @param n neighbour to take messages from
2135 * @param buf target buffer
2136 * @param size size of buf
2137 * @param deadline set to transmission deadline for the result
2138 * @param retry_time set to the time when we should try again
2139 * (only valid if this function returns zero)
2140 * @param priority set to the priority of the batch
2141 * @return number of bytes written to buf (can be zero)
2144 batch_message (struct Neighbour *n,
2147 struct GNUNET_TIME_Absolute *deadline,
2148 struct GNUNET_TIME_Relative *retry_time,
2149 unsigned int *priority)
2151 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
2152 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
2153 struct MessageEntry *pos;
2154 struct MessageEntry *prev;
2155 struct MessageEntry *next;
2160 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2161 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
2162 if (0 == select_messages (n, size, retry_time))
2165 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2166 "No messages selected, will try again in %llu ms\n",
2167 retry_time->rel_value);
2171 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
2172 ntm->ats_count = htonl (0);
2173 ntm->ats.type = htonl (0);
2174 ntm->ats.value = htonl (0);
2175 ntm->peer = n->peer;
2178 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
2181 if (GNUNET_YES == pos->do_transmit)
2183 GNUNET_assert (pos->size <= size);
2184 /* do notifications */
2185 /* FIXME: track if we have *any* client that wants
2186 full notifications and only do this if that is
2188 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
2190 memcpy (&ntm[1], &pos[1], pos->size);
2191 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2192 sizeof (struct GNUNET_MessageHeader));
2193 send_to_all_clients (&ntm->header,
2195 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
2199 /* message too large for 'full' notifications, we do at
2200 least the 'hdr' type */
2203 sizeof (struct GNUNET_MessageHeader));
2205 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2207 send_to_all_clients (&ntm->header,
2209 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
2211 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2212 "Encrypting %u bytes with message of type %u and size %u\n",
2214 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
2215 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
2217 /* copy for encrypted transmission */
2218 memcpy (&buf[ret], &pos[1], pos->size);
2221 *priority += pos->priority;
2223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2224 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
2225 (unsigned int) pos->size,
2226 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).rel_value);
2228 deadline->abs_value = GNUNET_MIN (deadline->abs_value, pos->deadline.abs_value);
2242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2243 "Deadline for message batch is %llu ms\n",
2244 GNUNET_TIME_absolute_get_remaining (*deadline).rel_value);
2251 * Remove messages with deadlines that have long expired from
2254 * @param n neighbour to inspect
2257 discard_expired_messages (struct Neighbour *n)
2259 struct MessageEntry *prev;
2260 struct MessageEntry *next;
2261 struct MessageEntry *pos;
2262 struct GNUNET_TIME_Absolute now;
2263 struct GNUNET_TIME_Relative delta;
2267 now = GNUNET_TIME_absolute_get ();
2273 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
2274 if (delta.rel_value > PAST_EXPIRATION_DISCARD_TIME.rel_value)
2277 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2278 "Message is %llu ms past due, discarding.\n",
2285 GNUNET_STATISTICS_update (stats,
2286 gettext_noop ("# messages discarded (expired prior to transmission)"),
2296 if (GNUNET_YES == disc)
2297 schedule_peer_messages (n);
2302 * Signature of the main function of a task.
2304 * @param cls closure
2305 * @param tc context information (why was this task triggered now)
2308 retry_plaintext_processing (void *cls,
2309 const struct GNUNET_SCHEDULER_TaskContext *tc)
2311 struct Neighbour *n = cls;
2313 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2314 process_plaintext_neighbour_queue (n);
2319 * Send our key (and encrypted PING) to the other peer.
2321 * @param n the other peer
2323 static void send_key (struct Neighbour *n);
2326 * Task that will retry "send_key" if our previous attempt failed
2330 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2332 struct Neighbour *n = cls;
2335 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2336 "Retrying key transmission to `%4s'\n",
2337 GNUNET_i2s (&n->peer));
2339 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2340 n->set_key_retry_frequency =
2341 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
2347 * Check if we have plaintext messages for the specified neighbour
2348 * pending, and if so, consider batching and encrypting them (and
2349 * then trigger processing of the encrypted queue if needed).
2351 * @param n neighbour to check.
2354 process_plaintext_neighbour_queue (struct Neighbour *n)
2356 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
2358 struct EncryptedMessage *em; /* encrypted message */
2359 struct EncryptedMessage *ph; /* plaintext header */
2360 struct MessageEntry *me;
2361 unsigned int priority;
2362 struct GNUNET_TIME_Absolute deadline;
2363 struct GNUNET_TIME_Relative retry_time;
2364 struct GNUNET_CRYPTO_AesInitializationVector iv;
2365 struct GNUNET_CRYPTO_AuthKey auth_key;
2367 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
2369 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
2370 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2374 case PEER_STATE_DOWN:
2377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2378 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2379 GNUNET_i2s(&n->peer));
2382 case PEER_STATE_KEY_SENT:
2383 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2384 n->retry_set_key_task
2385 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2386 &set_key_retry_task, n);
2388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2389 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2390 GNUNET_i2s(&n->peer));
2393 case PEER_STATE_KEY_RECEIVED:
2394 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2395 n->retry_set_key_task
2396 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2397 &set_key_retry_task, n);
2399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2400 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2401 GNUNET_i2s(&n->peer));
2404 case PEER_STATE_KEY_CONFIRMED:
2405 /* ready to continue */
2408 discard_expired_messages (n);
2409 if (n->messages == NULL)
2412 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2413 "Plaintext message queue for `%4s' is empty.\n",
2414 GNUNET_i2s(&n->peer));
2416 return; /* no pending messages */
2418 if (n->encrypted_head != NULL)
2421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2422 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2423 GNUNET_i2s(&n->peer));
2425 return; /* wait for messages already encrypted to be
2428 ph = (struct EncryptedMessage *) pbuf;
2429 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2431 used = sizeof (struct EncryptedMessage);
2432 used += batch_message (n,
2434 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2435 &deadline, &retry_time, &priority);
2436 if (used == sizeof (struct EncryptedMessage))
2439 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2440 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2441 GNUNET_i2s(&n->peer));
2443 /* no messages selected for sending, try again later... */
2444 n->retry_plaintext_task =
2445 GNUNET_SCHEDULER_add_delayed (retry_time,
2446 &retry_plaintext_processing, n);
2449 #if DEBUG_CORE_QUOTA
2450 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2451 "Sending %u b/s as new limit to peer `%4s'\n",
2452 (unsigned int) ntohl (n->bw_in.value__),
2453 GNUNET_i2s (&n->peer));
2455 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
2456 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2457 ph->inbound_bw_limit = n->bw_in;
2458 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2460 /* setup encryption message header */
2461 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2462 me->deadline = deadline;
2463 me->priority = priority;
2465 em = (struct EncryptedMessage *) &me[1];
2466 em->header.size = htons (used);
2467 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2468 em->iv_seed = ph->iv_seed;
2469 derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
2472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2473 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2474 (unsigned int) used - ENCRYPTED_HEADER_SIZE,
2475 GNUNET_i2s(&n->peer),
2476 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).rel_value);
2478 GNUNET_assert (GNUNET_OK ==
2481 &ph->sequence_number,
2482 &em->sequence_number, used - ENCRYPTED_HEADER_SIZE));
2483 derive_auth_key (&auth_key,
2486 n->encrypt_key_created);
2487 GNUNET_CRYPTO_hmac (&auth_key,
2488 &em->sequence_number,
2489 used - ENCRYPTED_HEADER_SIZE,
2492 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2493 "Authenticated %u bytes of ciphertext %u: `%s'\n",
2494 used - ENCRYPTED_HEADER_SIZE,
2495 GNUNET_CRYPTO_crc32_n (&em->sequence_number,
2496 used - ENCRYPTED_HEADER_SIZE),
2497 GNUNET_h2s (&em->hmac));
2499 /* append to transmission list */
2500 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2504 process_encrypted_neighbour_queue (n);
2505 schedule_peer_messages (n);
2510 * Function that recalculates the bandwidth quota for the
2511 * given neighbour and transmits it to the transport service.
2513 * @param cls neighbour for the quota update
2517 neighbour_quota_update (void *cls,
2518 const struct GNUNET_SCHEDULER_TaskContext *tc);
2522 * Schedule the task that will recalculate the bandwidth
2523 * quota for this peer (and possibly force a disconnect of
2524 * idle peers by calculating a bandwidth of zero).
2527 schedule_quota_update (struct Neighbour *n)
2529 GNUNET_assert (n->quota_update_task ==
2530 GNUNET_SCHEDULER_NO_TASK);
2531 n->quota_update_task
2532 = GNUNET_SCHEDULER_add_delayed (QUOTA_UPDATE_FREQUENCY,
2533 &neighbour_quota_update,
2539 * Initialize a new 'struct Neighbour'.
2541 * @param pid ID of the new neighbour
2542 * @return handle for the new neighbour
2544 static struct Neighbour *
2545 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2547 struct Neighbour *n;
2548 struct GNUNET_TIME_Absolute now;
2551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2552 "Creating neighbour entry for peer `%4s'\n",
2555 n = GNUNET_malloc (sizeof (struct Neighbour));
2556 n->next = neighbours;
2559 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
2561 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2562 now = GNUNET_TIME_absolute_get ();
2563 n->encrypt_key_created = now;
2564 n->last_activity = now;
2565 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2566 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2567 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2568 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2569 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2570 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
2572 neighbour_quota_update (n, NULL);
2573 consider_free_neighbour (n);
2579 * Handle CORE_SEND request.
2582 * @param client the client issuing the request
2583 * @param message the "struct SendMessage"
2586 handle_client_send (void *cls,
2587 struct GNUNET_SERVER_Client *client,
2588 const struct GNUNET_MessageHeader *message)
2590 const struct SendMessage *sm;
2591 struct Neighbour *n;
2592 struct MessageEntry *prev;
2593 struct MessageEntry *pos;
2594 struct MessageEntry *e;
2595 struct MessageEntry *min_prio_entry;
2596 struct MessageEntry *min_prio_prev;
2597 unsigned int min_prio;
2598 unsigned int queue_size;
2601 msize = ntohs (message->size);
2603 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2605 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));
2608 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2611 sm = (const struct SendMessage *) message;
2612 msize -= sizeof (struct SendMessage);
2613 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2615 /* FIXME: should we not allow loopback-injection here? */
2618 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2621 n = find_neighbour (&sm->peer);
2623 n = create_neighbour (&sm->peer);
2625 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2626 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2628 (unsigned int) msize,
2629 GNUNET_i2s (&sm->peer));
2631 discard_expired_messages (n);
2632 /* bound queue size */
2633 /* NOTE: this entire block to bound the queue size should be
2634 obsolete with the new client-request code and the
2635 'schedule_peer_messages' mechanism; we still have this code in
2636 here for now as a sanity check for the new mechanmism;
2637 ultimately, we should probably simply reject SEND messages that
2638 are not 'approved' (or provide a new core API for very unreliable
2639 delivery that always sends with priority 0). Food for thought. */
2640 min_prio = UINT32_MAX;
2641 min_prio_entry = NULL;
2642 min_prio_prev = NULL;
2648 if (pos->priority <= min_prio)
2650 min_prio_entry = pos;
2651 min_prio_prev = prev;
2652 min_prio = pos->priority;
2658 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2661 if (ntohl(sm->priority) <= min_prio)
2663 /* discard new entry; this should no longer happen! */
2666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2667 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2669 (unsigned int) MAX_PEER_QUEUE_SIZE,
2670 (unsigned int) msize,
2671 (unsigned int) ntohs (message->type));
2673 GNUNET_STATISTICS_update (stats,
2674 gettext_noop ("# discarded CORE_SEND requests"),
2678 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2681 GNUNET_assert (min_prio_entry != NULL);
2682 /* discard "min_prio_entry" */
2684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2685 "Queue full, discarding existing older request\n");
2687 GNUNET_STATISTICS_update (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 1, GNUNET_NO);
2688 if (min_prio_prev == NULL)
2689 n->messages = min_prio_entry->next;
2691 min_prio_prev->next = min_prio_entry->next;
2692 GNUNET_free (min_prio_entry);
2696 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2697 "Adding transmission request for `%4s' of size %u to queue\n",
2698 GNUNET_i2s (&sm->peer),
2699 (unsigned int) msize);
2701 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2702 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2703 e->priority = ntohl (sm->priority);
2705 memcpy (&e[1], &sm[1], msize);
2707 /* insert, keep list sorted by deadline */
2710 while ((pos != NULL) && (pos->deadline.abs_value < e->deadline.abs_value))
2721 /* consider scheduling now */
2722 process_plaintext_neighbour_queue (n);
2724 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2729 * Function called when the transport service is ready to
2730 * receive a message. Only resets 'n->th' to NULL.
2732 * @param cls neighbour to use message from
2733 * @param size number of bytes we can transmit
2734 * @param buf where to copy the message
2735 * @return number of bytes transmitted
2738 notify_transport_connect_done (void *cls, size_t size, void *buf)
2740 struct Neighbour *n = cls;
2742 if (GNUNET_YES != n->is_connected)
2744 /* transport should only call us to transmit a message after
2745 * telling us about a successful connection to the respective peer */
2746 n->th = NULL; /* If this happens because of a timeout, reset n-th so another message may be sent for this peer! */
2748 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Timeout on notify connect!\n");
2755 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2756 _("Failed to connect to `%4s': transport failed to connect\n"),
2757 GNUNET_i2s (&n->peer));
2760 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2761 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2762 GNUNET_i2s (&n->peer));
2763 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2764 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2765 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (&set_key_retry_task,
2772 * Handle CORE_REQUEST_CONNECT request.
2775 * @param client the client issuing the request
2776 * @param message the "struct ConnectMessage"
2779 handle_client_request_connect (void *cls,
2780 struct GNUNET_SERVER_Client *client,
2781 const struct GNUNET_MessageHeader *message)
2783 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2784 struct Neighbour *n;
2785 struct GNUNET_TIME_Relative timeout;
2787 if (0 == memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2790 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2793 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2794 n = find_neighbour (&cm->peer);
2796 n = create_neighbour (&cm->peer);
2797 if ( (GNUNET_YES == n->is_connected) ||
2800 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2801 "Core received `%s' request for `%4s', already connected!\n",
2803 GNUNET_i2s (&cm->peer));
2804 return; /* already connected, or at least trying */
2806 GNUNET_STATISTICS_update (stats, gettext_noop ("# connection requests received"), 1, GNUNET_NO);
2808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2809 "Core received `%s' request for `%4s', will try to establish connection\n",
2811 GNUNET_i2s (&cm->peer));
2813 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2814 /* ask transport to connect to the peer */
2815 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2817 sizeof (struct GNUNET_MessageHeader), 0,
2819 ¬ify_transport_connect_done,
2821 GNUNET_break (NULL != n->th);
2826 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2827 * the neighbour's struct and retry send_key. Or, if we did not get a
2828 * HELLO, just do nothing.
2830 * @param cls the 'struct Neighbour' to retry sending the key for
2831 * @param peer the peer for which this is the HELLO
2832 * @param hello HELLO message of that peer
2835 process_hello_retry_send_key (void *cls,
2836 const struct GNUNET_PeerIdentity *peer,
2837 const struct GNUNET_HELLO_Message *hello)
2839 struct Neighbour *n = cls;
2844 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2845 "Entered `%s' and `%s' is NULL!\n",
2846 "process_hello_retry_send_key",
2850 if (n->public_key != NULL)
2852 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2854 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2855 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2857 GNUNET_STATISTICS_update (stats,
2858 gettext_noop ("# SET_KEY messages deferred (need public key)"),
2866 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2867 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
2868 GNUNET_i2s (&n->peer));
2870 GNUNET_STATISTICS_update (stats,
2871 gettext_noop ("# Delayed connecting due to lack of public key"),
2874 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2875 n->retry_set_key_task
2876 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2877 &set_key_retry_task, n);
2883 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2884 "Entered `%s' for peer `%4s'\n",
2885 "process_hello_retry_send_key",
2888 if (n->public_key != NULL)
2890 /* already have public key, why are we here? */
2896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2897 "Received new `%s' message for `%4s', initiating key exchange.\n",
2902 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2903 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2905 GNUNET_STATISTICS_update (stats,
2906 gettext_noop ("# Error extracting public key from HELLO"),
2909 GNUNET_free (n->public_key);
2910 n->public_key = NULL;
2912 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2913 "GNUNET_HELLO_get_key returned awfully\n");
2921 * Send our key (and encrypted PING) to the other peer.
2923 * @param n the other peer
2926 send_key (struct Neighbour *n)
2928 struct MessageEntry *pos;
2929 struct SetKeyMessage *sm;
2930 struct MessageEntry *me;
2931 struct PingMessage pp;
2932 struct PingMessage *pm;
2933 struct GNUNET_CRYPTO_AesInitializationVector iv;
2935 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2937 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2938 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2940 if (n->pitr != NULL)
2943 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2944 "Key exchange in progress with `%4s'.\n",
2945 GNUNET_i2s (&n->peer));
2947 return; /* already in progress */
2949 if (GNUNET_YES != n->is_connected)
2952 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2953 "Not yet connected to peer `%4s'!\n",
2954 GNUNET_i2s (&n->peer));
2958 GNUNET_STATISTICS_update (stats,
2959 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
2962 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2964 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
2966 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2967 ¬ify_encrypted_transmit_ready,
2973 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2974 "Asked to perform key exchange with `%4s'.\n",
2975 GNUNET_i2s (&n->peer));
2977 if (n->public_key == NULL)
2979 /* lookup n's public key, then try again */
2981 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2982 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2983 GNUNET_i2s (&n->peer));
2985 GNUNET_assert (n->pitr == NULL);
2986 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
2988 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2989 &process_hello_retry_send_key, n);
2992 pos = n->encrypted_head;
2995 if (GNUNET_YES == pos->is_setkey)
2997 if (pos->sender_status == n->status)
3000 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3001 "`%s' message for `%4s' queued already\n",
3003 GNUNET_i2s (&n->peer));
3005 goto trigger_processing;
3007 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
3012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3013 "Removing queued `%s' message for `%4s', will create a new one\n",
3015 GNUNET_i2s (&n->peer));
3025 case PEER_STATE_DOWN:
3026 n->status = PEER_STATE_KEY_SENT;
3028 case PEER_STATE_KEY_SENT:
3030 case PEER_STATE_KEY_RECEIVED:
3032 case PEER_STATE_KEY_CONFIRMED:
3040 /* first, set key message */
3041 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3042 sizeof (struct SetKeyMessage) +
3043 sizeof (struct PingMessage));
3044 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
3045 me->priority = SET_KEY_PRIORITY;
3046 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
3047 me->is_setkey = GNUNET_YES;
3048 me->got_slack = GNUNET_YES; /* do not defer this one! */
3049 me->sender_status = n->status;
3050 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3054 sm = (struct SetKeyMessage *) &me[1];
3055 sm->header.size = htons (sizeof (struct SetKeyMessage));
3056 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
3057 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
3058 PEER_STATE_KEY_SENT : n->status));
3060 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3061 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3062 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3063 sizeof (struct GNUNET_PeerIdentity));
3064 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
3065 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
3066 sm->target = n->peer;
3067 GNUNET_assert (GNUNET_OK ==
3068 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
3070 GNUNET_CRYPTO_AesSessionKey),
3072 &sm->encrypted_key));
3073 GNUNET_assert (GNUNET_OK ==
3074 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
3076 pm = (struct PingMessage *) &sm[1];
3077 pm->header.size = htons (sizeof (struct PingMessage));
3078 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
3079 pm->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3080 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
3081 pp.challenge = n->ping_challenge;
3082 pp.target = n->peer;
3084 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3085 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
3087 (unsigned int) n->ping_challenge,
3088 GNUNET_i2s (&n->peer),
3089 (unsigned int) n->encrypt_key.crc32,
3090 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3097 sizeof (struct PingMessage) -
3098 ((void *) &pm->target - (void *) pm));
3099 GNUNET_STATISTICS_update (stats,
3100 gettext_noop ("# SET_KEY and PING messages created"),
3104 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3105 "Have %llu ms left for `%s' transmission.\n",
3106 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).rel_value,
3110 /* trigger queue processing */
3111 process_encrypted_neighbour_queue (n);
3112 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
3113 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
3114 n->retry_set_key_task
3115 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3116 &set_key_retry_task, n);
3121 * We received a SET_KEY message. Validate and update
3122 * our key material and status.
3124 * @param n the neighbour from which we received message m
3125 * @param m the set key message we received
3128 handle_set_key (struct Neighbour *n,
3129 const struct SetKeyMessage *m);
3133 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3134 * the neighbour's struct and retry handling the set_key message. Or,
3135 * if we did not get a HELLO, just free the set key message.
3137 * @param cls pointer to the set key message
3138 * @param peer the peer for which this is the HELLO
3139 * @param hello HELLO message of that peer
3142 process_hello_retry_handle_set_key (void *cls,
3143 const struct GNUNET_PeerIdentity *peer,
3144 const struct GNUNET_HELLO_Message *hello)
3146 struct Neighbour *n = cls;
3147 struct SetKeyMessage *sm = n->skm;
3153 if (n->public_key != NULL)
3156 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3157 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
3159 GNUNET_i2s (&n->peer),
3162 handle_set_key (n, sm);
3166 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3167 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
3169 GNUNET_i2s (&n->peer));
3174 if (n->public_key != NULL)
3175 return; /* multiple HELLOs match!? */
3177 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3178 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3180 GNUNET_break_op (0);
3181 GNUNET_free (n->public_key);
3182 n->public_key = NULL;
3188 * We received a PING message. Validate and transmit
3191 * @param n sender of the PING
3192 * @param m the encrypted PING message itself
3195 handle_ping (struct Neighbour *n, const struct PingMessage *m)
3197 struct PingMessage t;
3198 struct PongMessage tx;
3199 struct PongMessage *tp;
3200 struct MessageEntry *me;
3201 struct GNUNET_CRYPTO_AesInitializationVector iv;
3204 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3205 "Core service receives `%s' request from `%4s'.\n",
3206 "PING", GNUNET_i2s (&n->peer));
3208 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3214 sizeof (struct PingMessage) -
3215 ((void *) &m->target - (void *) m)))
3218 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3219 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
3221 GNUNET_i2s (&t.target),
3222 (unsigned int) t.challenge,
3223 (unsigned int) n->decrypt_key.crc32,
3224 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3227 GNUNET_STATISTICS_update (stats,
3228 gettext_noop ("# PING messages decrypted"),
3231 if (0 != memcmp (&t.target,
3232 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3234 GNUNET_break_op (0);
3237 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3238 sizeof (struct PongMessage));
3239 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3243 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
3244 me->priority = PONG_PRIORITY;
3245 me->size = sizeof (struct PongMessage);
3246 tx.inbound_bw_limit = n->bw_in;
3247 tx.challenge = t.challenge;
3248 tx.target = t.target;
3249 tp = (struct PongMessage *) &me[1];
3250 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
3251 tp->header.size = htons (sizeof (struct PongMessage));
3252 tp->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3253 derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
3258 sizeof (struct PongMessage) -
3259 ((void *) &tp->challenge - (void *) tp));
3260 GNUNET_STATISTICS_update (stats,
3261 gettext_noop ("# PONG messages created"),
3265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3266 "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
3268 (unsigned int) t.challenge,
3269 (unsigned int) n->encrypt_key.crc32,
3270 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3273 /* trigger queue processing */
3274 process_encrypted_neighbour_queue (n);
3279 * We received a PONG message. Validate and update our status.
3281 * @param n sender of the PONG
3282 * @param m the encrypted PONG message itself
3285 handle_pong (struct Neighbour *n,
3286 const struct PongMessage *m)
3288 struct PongMessage t;
3289 struct ConnectNotifyMessage cnm;
3290 struct GNUNET_CRYPTO_AesInitializationVector iv;
3293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3294 "Core service receives `%s' response from `%4s'.\n",
3295 "PONG", GNUNET_i2s (&n->peer));
3297 /* mark as garbage, just to be sure */
3298 memset (&t, 255, sizeof (t));
3299 derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
3306 sizeof (struct PongMessage) -
3307 ((void *) &m->challenge - (void *) m)))
3309 GNUNET_break_op (0);
3312 GNUNET_STATISTICS_update (stats,
3313 gettext_noop ("# PONG messages decrypted"),
3317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3318 "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
3320 GNUNET_i2s (&t.target),
3321 (unsigned int) t.challenge,
3322 (unsigned int) n->decrypt_key.crc32,
3323 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3326 if ((0 != memcmp (&t.target,
3328 sizeof (struct GNUNET_PeerIdentity))) ||
3329 (n->ping_challenge != t.challenge))
3331 /* PONG malformed */
3333 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3334 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
3336 GNUNET_i2s (&n->peer),
3337 (unsigned int) n->ping_challenge);
3338 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3339 "Received malformed `%s' received from `%4s' with challenge %u\n",
3340 "PONG", GNUNET_i2s (&t.target),
3341 (unsigned int) t.challenge);
3343 GNUNET_break_op (0);
3348 case PEER_STATE_DOWN:
3349 GNUNET_break (0); /* should be impossible */
3351 case PEER_STATE_KEY_SENT:
3352 GNUNET_break (0); /* should be impossible, how did we decrypt? */
3354 case PEER_STATE_KEY_RECEIVED:
3355 GNUNET_STATISTICS_update (stats,
3356 gettext_noop ("# Session keys confirmed via PONG"),
3359 n->status = PEER_STATE_KEY_CONFIRMED;
3360 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
3362 n->bw_out_external_limit = t.inbound_bw_limit;
3363 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3364 n->bw_out_internal_limit);
3365 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3367 GNUNET_TRANSPORT_set_quota (transport,
3371 GNUNET_TIME_UNIT_FOREVER_REL,
3375 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3376 "Confirmed key via `%s' message for peer `%4s'\n",
3377 "PONG", GNUNET_i2s (&n->peer));
3379 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3381 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3382 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3384 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
3385 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
3387 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
3388 process_encrypted_neighbour_queue (n);
3390 case PEER_STATE_KEY_CONFIRMED:
3391 n->last_activity = GNUNET_TIME_absolute_get ();
3392 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3393 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3395 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3398 handle_peer_status_change (n);
3408 * We received a SET_KEY message. Validate and update
3409 * our key material and status.
3411 * @param n the neighbour from which we received message m
3412 * @param m the set key message we received
3415 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
3417 struct SetKeyMessage *m_cpy;
3418 struct GNUNET_TIME_Absolute t;
3419 struct GNUNET_CRYPTO_AesSessionKey k;
3420 struct PingMessage *ping;
3421 struct PongMessage *pong;
3422 enum PeerStateMachine sender_status;
3425 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3426 "Core service receives `%s' request from `%4s'.\n",
3427 "SET_KEY", GNUNET_i2s (&n->peer));
3429 if (n->public_key == NULL)
3431 if (n->pitr != NULL)
3434 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3435 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3441 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3442 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3444 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3445 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3446 /* lookup n's public key, then try again */
3447 GNUNET_assert (n->skm == NULL);
3449 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3451 GNUNET_TIME_UNIT_MINUTES,
3452 &process_hello_retry_handle_set_key, n);
3453 GNUNET_STATISTICS_update (stats,
3454 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3459 if (0 != memcmp (&m->target,
3461 sizeof (struct GNUNET_PeerIdentity)))
3463 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3464 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3466 GNUNET_i2s (&m->target));
3469 if ((ntohl (m->purpose.size) !=
3470 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3471 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3472 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3473 sizeof (struct GNUNET_PeerIdentity)) ||
3475 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3476 &m->purpose, &m->signature, n->public_key)))
3478 /* invalid signature */
3479 GNUNET_break_op (0);
3482 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3483 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3484 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3485 (t.abs_value < n->decrypt_key_created.abs_value))
3487 /* this could rarely happen due to massive re-ordering of
3488 messages on the network level, but is most likely either
3489 a bug or some adversary messing with us. Report. */
3490 GNUNET_break_op (0);
3494 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3495 "Decrypting key material.\n");
3497 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3500 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3501 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3502 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3504 /* failed to decrypt !? */
3505 GNUNET_break_op (0);
3508 GNUNET_STATISTICS_update (stats,
3509 gettext_noop ("# SET_KEY messages decrypted"),
3513 if (n->decrypt_key_created.abs_value != t.abs_value)
3515 /* fresh key, reset sequence numbers */
3516 n->last_sequence_number_received = 0;
3517 n->last_packets_bitmap = 0;
3518 n->decrypt_key_created = t;
3520 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3523 case PEER_STATE_DOWN:
3524 n->status = PEER_STATE_KEY_RECEIVED;
3526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3527 "Responding to `%s' with my own key.\n", "SET_KEY");
3531 case PEER_STATE_KEY_SENT:
3532 case PEER_STATE_KEY_RECEIVED:
3533 n->status = PEER_STATE_KEY_RECEIVED;
3534 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3535 (sender_status != PEER_STATE_KEY_CONFIRMED))
3538 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3539 "Responding to `%s' with my own key (other peer has status %u).\n",
3541 (unsigned int) sender_status);
3546 case PEER_STATE_KEY_CONFIRMED:
3547 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3548 (sender_status != PEER_STATE_KEY_CONFIRMED))
3551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3552 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3554 (unsigned int) sender_status);
3563 if (n->pending_ping != NULL)
3565 ping = n->pending_ping;
3566 n->pending_ping = NULL;
3567 handle_ping (n, ping);
3570 if (n->pending_pong != NULL)
3572 pong = n->pending_pong;
3573 n->pending_pong = NULL;
3574 handle_pong (n, pong);
3581 * Send a P2P message to a client.
3583 * @param sender who sent us the message?
3584 * @param client who should we give the message to?
3585 * @param m contains the message to transmit
3586 * @param msize number of bytes in buf to transmit
3589 send_p2p_message_to_client (struct Neighbour *sender,
3590 struct Client *client,
3591 const void *m, size_t msize)
3593 char buf[msize + sizeof (struct NotifyTrafficMessage)];
3594 struct NotifyTrafficMessage *ntm;
3597 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3598 "Core service passes message from `%4s' of type %u to client.\n",
3599 GNUNET_i2s(&sender->peer),
3600 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3602 ntm = (struct NotifyTrafficMessage *) buf;
3603 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
3604 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3605 ntm->ats_count = htonl (0);
3606 ntm->ats.type = htonl (0);
3607 ntm->ats.value = htonl (0);
3608 ntm->peer = sender->peer;
3609 memcpy (&ntm[1], m, msize);
3610 send_to_client (client, &ntm->header, GNUNET_YES);
3615 * Deliver P2P message to interested clients.
3617 * @param cls always NULL
3618 * @param client who sent us the message (struct Neighbour)
3619 * @param m the message
3622 deliver_message (void *cls,
3624 const struct GNUNET_MessageHeader *m)
3626 struct Neighbour *sender = client;
3627 size_t msize = ntohs (m->size);
3629 struct Client *cpos;
3635 type = ntohs (m->type);
3637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3638 "Received encapsulated message of type %u and size %u from `%4s'\n",
3639 (unsigned int) type,
3641 GNUNET_i2s (&sender->peer));
3643 GNUNET_snprintf (buf,
3645 gettext_noop ("# bytes of messages of type %u received"),
3646 (unsigned int) type);
3647 GNUNET_STATISTICS_set (stats,
3651 dropped = GNUNET_YES;
3653 while (cpos != NULL)
3655 deliver_full = GNUNET_NO;
3656 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
3657 deliver_full = GNUNET_YES;
3660 for (tpos = 0; tpos < cpos->tcnt; tpos++)
3662 if (type != cpos->types[tpos])
3664 deliver_full = GNUNET_YES;
3668 if (GNUNET_YES == deliver_full)
3670 send_p2p_message_to_client (sender, cpos, m, msize);
3671 dropped = GNUNET_NO;
3673 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
3675 send_p2p_message_to_client (sender, cpos, m,
3676 sizeof (struct GNUNET_MessageHeader));
3680 if (dropped == GNUNET_YES)
3683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3684 "Message of type %u from `%4s' not delivered to any client.\n",
3685 (unsigned int) type,
3686 GNUNET_i2s (&sender->peer));
3688 GNUNET_STATISTICS_update (stats,
3689 gettext_noop ("# messages not delivered to any client"),
3696 * We received an encrypted message. Decrypt, validate and
3697 * pass on to the appropriate clients.
3700 handle_encrypted_message (struct Neighbour *n,
3701 const struct EncryptedMessage *m)
3703 size_t size = ntohs (m->header.size);
3705 struct EncryptedMessage *pt; /* plaintext */
3708 struct GNUNET_TIME_Absolute t;
3709 struct GNUNET_CRYPTO_AesInitializationVector iv;
3710 struct GNUNET_CRYPTO_AuthKey auth_key;
3713 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3714 "Core service receives `%s' request from `%4s'.\n",
3715 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
3718 derive_auth_key (&auth_key,
3721 n->decrypt_key_created);
3722 GNUNET_CRYPTO_hmac (&auth_key,
3723 &m->sequence_number,
3724 size - ENCRYPTED_HEADER_SIZE, &ph);
3726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3727 "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
3728 (unsigned int) size - ENCRYPTED_HEADER_SIZE,
3729 GNUNET_CRYPTO_crc32_n (&m->sequence_number,
3730 size - ENCRYPTED_HEADER_SIZE),
3734 if (0 != memcmp (&ph,
3736 sizeof (GNUNET_HashCode)))
3738 /* checksum failed */
3739 GNUNET_break_op (0);
3742 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3747 &m->sequence_number,
3748 &buf[ENCRYPTED_HEADER_SIZE],
3749 size - ENCRYPTED_HEADER_SIZE))
3751 pt = (struct EncryptedMessage *) buf;
3753 /* validate sequence number */
3754 snum = ntohl (pt->sequence_number);
3755 if (n->last_sequence_number_received == snum)
3757 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3758 "Received duplicate message, ignoring.\n");
3759 /* duplicate, ignore */
3760 GNUNET_STATISTICS_set (stats,
3761 gettext_noop ("# bytes dropped (duplicates)"),
3766 if ((n->last_sequence_number_received > snum) &&
3767 (n->last_sequence_number_received - snum > 32))
3769 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3770 "Received ancient out of sequence message, ignoring.\n");
3771 /* ancient out of sequence, ignore */
3772 GNUNET_STATISTICS_set (stats,
3773 gettext_noop ("# bytes dropped (out of sequence)"),
3778 if (n->last_sequence_number_received > snum)
3780 unsigned int rotbit =
3781 1 << (n->last_sequence_number_received - snum - 1);
3782 if ((n->last_packets_bitmap & rotbit) != 0)
3784 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3785 "Received duplicate message, ignoring.\n");
3786 GNUNET_STATISTICS_set (stats,
3787 gettext_noop ("# bytes dropped (duplicates)"),
3790 /* duplicate, ignore */
3793 n->last_packets_bitmap |= rotbit;
3795 if (n->last_sequence_number_received < snum)
3797 int shift = (snum - n->last_sequence_number_received);
3798 if (shift >= 8 * sizeof(n->last_packets_bitmap))
3799 n->last_packets_bitmap = 0;
3801 n->last_packets_bitmap <<= shift;
3802 n->last_sequence_number_received = snum;
3805 /* check timestamp */
3806 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
3807 if (GNUNET_TIME_absolute_get_duration (t).rel_value > MAX_MESSAGE_AGE.rel_value)
3809 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3811 ("Message received far too old (%llu ms). Content ignored.\n"),
3812 GNUNET_TIME_absolute_get_duration (t).rel_value);
3813 GNUNET_STATISTICS_set (stats,
3814 gettext_noop ("# bytes dropped (ancient message)"),
3820 /* process decrypted message(s) */
3821 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
3823 #if DEBUG_CORE_SET_QUOTA
3824 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3825 "Received %u b/s as new inbound limit for peer `%4s'\n",
3826 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
3827 GNUNET_i2s (&n->peer));
3829 n->bw_out_external_limit = pt->inbound_bw_limit;
3830 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3831 n->bw_out_internal_limit);
3832 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3834 GNUNET_TRANSPORT_set_quota (transport,
3838 GNUNET_TIME_UNIT_FOREVER_REL,
3841 n->last_activity = GNUNET_TIME_absolute_get ();
3842 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3843 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3845 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3848 GNUNET_STATISTICS_set (stats,
3849 gettext_noop ("# bytes of payload decrypted"),
3850 size - sizeof (struct EncryptedMessage),
3852 handle_peer_status_change (n);
3853 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
3855 &buf[sizeof (struct EncryptedMessage)],
3856 size - sizeof (struct EncryptedMessage),
3857 GNUNET_YES, GNUNET_NO))
3858 GNUNET_break_op (0);
3863 * Function called by the transport for each received message.
3865 * @param cls closure
3866 * @param peer (claimed) identity of the other peer
3867 * @param message the message
3868 * @param latency estimated latency for communicating with the
3869 * given peer (round-trip)
3870 * @param distance in overlay hops, as given by transport plugin
3873 handle_transport_receive (void *cls,
3874 const struct GNUNET_PeerIdentity *peer,
3875 const struct GNUNET_MessageHeader *message,
3876 struct GNUNET_TIME_Relative latency,
3877 unsigned int distance)
3879 struct Neighbour *n;
3880 struct GNUNET_TIME_Absolute now;
3887 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3888 "Received message of type %u from `%4s', demultiplexing.\n",
3889 (unsigned int) ntohs (message->type),
3892 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3897 n = find_neighbour (peer);
3899 n = create_neighbour (peer);
3900 changed = GNUNET_YES; /* FIXME... */
3901 up = (n->status == PEER_STATE_KEY_CONFIRMED);
3902 type = ntohs (message->type);
3903 size = ntohs (message->size);
3906 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
3907 if (size != sizeof (struct SetKeyMessage))
3909 GNUNET_break_op (0);
3912 GNUNET_STATISTICS_update (stats, gettext_noop ("# session keys received"), 1, GNUNET_NO);
3913 handle_set_key (n, (const struct SetKeyMessage *) message);
3915 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3916 if (size < sizeof (struct EncryptedMessage) +
3917 sizeof (struct GNUNET_MessageHeader))
3919 GNUNET_break_op (0);
3922 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3923 (n->status != PEER_STATE_KEY_CONFIRMED))
3925 GNUNET_break_op (0);
3928 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3930 case GNUNET_MESSAGE_TYPE_CORE_PING:
3931 if (size != sizeof (struct PingMessage))
3933 GNUNET_break_op (0);
3936 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
3937 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3938 (n->status != PEER_STATE_KEY_CONFIRMED))
3941 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3942 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3943 "PING", GNUNET_i2s (&n->peer));
3945 GNUNET_free_non_null (n->pending_ping);
3946 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3947 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3950 handle_ping (n, (const struct PingMessage *) message);
3952 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3953 if (size != sizeof (struct PongMessage))
3955 GNUNET_break_op (0);
3958 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
3959 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3960 (n->status != PEER_STATE_KEY_CONFIRMED) )
3963 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3964 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3965 "PONG", GNUNET_i2s (&n->peer));
3967 GNUNET_free_non_null (n->pending_pong);
3968 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
3969 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
3972 handle_pong (n, (const struct PongMessage *) message);
3975 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3976 _("Unsupported message of type %u received.\n"),
3977 (unsigned int) type);
3980 if (n->status == PEER_STATE_KEY_CONFIRMED)
3982 now = GNUNET_TIME_absolute_get ();
3983 n->last_activity = now;
3984 changed = GNUNET_YES;
3987 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), 1, GNUNET_NO);
3988 n->time_established = now;
3990 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3991 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3993 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3998 handle_peer_status_change (n);
4003 * Function that recalculates the bandwidth quota for the
4004 * given neighbour and transmits it to the transport service.
4006 * @param cls neighbour for the quota update
4010 neighbour_quota_update (void *cls,
4011 const struct GNUNET_SCHEDULER_TaskContext *tc)
4013 struct Neighbour *n = cls;
4014 struct GNUNET_BANDWIDTH_Value32NBO q_in;
4017 unsigned long long distributable;
4018 uint64_t need_per_peer;
4019 uint64_t need_per_second;
4022 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4023 "Neighbour quota update calculation running for peer `%4s'\n",
4024 GNUNET_i2s (&n->peer));
4026 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
4027 /* calculate relative preference among all neighbours;
4028 divides by a bit more to avoid division by zero AND to
4029 account for possibility of new neighbours joining any time
4030 AND to convert to double... */
4031 if (preference_sum == 0)
4033 pref_rel = 1.0 / (double) neighbour_count;
4037 pref_rel = n->current_preference / preference_sum;
4039 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
4040 GNUNET_TIME_UNIT_SECONDS);
4041 need_per_second = need_per_peer * neighbour_count;
4043 if (bandwidth_target_out_bps > need_per_second)
4044 distributable = bandwidth_target_out_bps - need_per_second;
4045 share = distributable * pref_rel;
4046 if (share + need_per_peer > UINT32_MAX)
4047 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4049 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4050 /* check if we want to disconnect for good due to inactivity */
4051 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) &&
4052 (GNUNET_TIME_absolute_get_duration (n->time_established).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) )
4055 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4056 "Forcing disconnect of `%4s' due to inactivity\n",
4057 GNUNET_i2s (&n->peer));
4059 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
4061 #if DEBUG_CORE_QUOTA
4062 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4063 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
4064 GNUNET_i2s (&n->peer),
4065 (unsigned int) ntohl (q_in.value__),
4066 bandwidth_target_out_bps,
4067 (unsigned int) ntohl (n->bw_in.value__),
4068 (unsigned int) ntohl (n->bw_out.value__),
4069 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
4071 if (n->bw_in.value__ != q_in.value__)
4074 if (GNUNET_YES == n->is_connected)
4075 GNUNET_TRANSPORT_set_quota (transport,
4079 GNUNET_TIME_UNIT_FOREVER_REL,
4081 handle_peer_status_change (n);
4083 schedule_quota_update (n);
4088 * Function called by transport to notify us that
4089 * a peer connected to us (on the network level).
4091 * @param cls closure
4092 * @param peer the peer that connected
4093 * @param latency current latency of the connection
4094 * @param distance in overlay hops, as given by transport plugin
4097 handle_transport_notify_connect (void *cls,
4098 const struct GNUNET_PeerIdentity *peer,
4099 struct GNUNET_TIME_Relative latency,
4100 unsigned int distance)
4102 struct Neighbour *n;
4104 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4109 n = find_neighbour (peer);
4112 if (GNUNET_YES == n->is_connected)
4114 /* duplicate connect notification!? */
4121 n = create_neighbour (peer);
4123 GNUNET_STATISTICS_update (stats,
4124 gettext_noop ("# peers connected (transport)"),
4127 n->is_connected = GNUNET_YES;
4128 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
4131 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
4135 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4136 "Received connection from `%4s'.\n",
4137 GNUNET_i2s (&n->peer));
4139 GNUNET_TRANSPORT_set_quota (transport,
4143 GNUNET_TIME_UNIT_FOREVER_REL,
4150 * Function called by transport telling us that a peer
4153 * @param cls closure
4154 * @param peer the peer that disconnected
4157 handle_transport_notify_disconnect (void *cls,
4158 const struct GNUNET_PeerIdentity *peer)
4160 struct DisconnectNotifyMessage cnm;
4161 struct Neighbour *n;
4162 struct ClientActiveRequest *car;
4163 struct GNUNET_TIME_Relative left;
4166 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4167 "Peer `%4s' disconnected from us; received notification from transport.\n", GNUNET_i2s (peer));
4170 n = find_neighbour (peer);
4176 GNUNET_break (n->is_connected);
4177 if (n->status == PEER_STATE_KEY_CONFIRMED)
4179 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
4180 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
4182 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
4184 n->is_connected = GNUNET_NO;
4185 while (NULL != (car = n->active_client_request_head))
4187 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
4188 n->active_client_request_tail,
4190 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
4191 &n->peer.hashPubKey,
4196 GNUNET_STATISTICS_update (stats,
4197 gettext_noop ("# peers connected (transport)"),
4200 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
4201 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
4202 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4203 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
4204 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
4206 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
4207 &consider_free_task,
4213 * Last task run during shutdown. Disconnects us from
4217 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4219 struct Neighbour *n;
4223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4224 "Core service shutting down.\n");
4226 GNUNET_assert (transport != NULL);
4227 GNUNET_TRANSPORT_disconnect (transport);
4229 while (NULL != (n = neighbours))
4231 neighbours = n->next;
4232 GNUNET_assert (neighbour_count > 0);
4236 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
4237 GNUNET_SERVER_notification_context_destroy (notifier);
4239 while (NULL != (c = clients))
4240 handle_client_disconnect (NULL, c->client_handle);
4241 if (my_private_key != NULL)
4242 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4244 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4245 if (peerinfo != NULL)
4246 GNUNET_PEERINFO_disconnect (peerinfo);
4248 GNUNET_SERVER_mst_destroy (mst);
4253 * Initiate core service.
4255 * @param cls closure
4256 * @param server the initialized server
4257 * @param c configuration to use
4261 struct GNUNET_SERVER_Handle *server,
4262 const struct GNUNET_CONFIGURATION_Handle *c)
4264 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4265 {&handle_client_init, NULL,
4266 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
4267 {&handle_client_iterate_peers, NULL,
4268 GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS,
4269 sizeof (struct GNUNET_MessageHeader)},
4270 {&handle_client_request_info, NULL,
4271 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
4272 sizeof (struct RequestInfoMessage)},
4273 {&handle_client_send_request, NULL,
4274 GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST,
4275 sizeof (struct SendMessageRequest)},
4276 {&handle_client_send, NULL,
4277 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
4278 {&handle_client_request_connect, NULL,
4279 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
4280 sizeof (struct ConnectMessage)},
4286 /* parse configuration */
4289 GNUNET_CONFIGURATION_get_value_number (c,
4292 &bandwidth_target_in_bps)) ||
4294 GNUNET_CONFIGURATION_get_value_number (c,
4297 &bandwidth_target_out_bps)) ||
4299 GNUNET_CONFIGURATION_get_value_filename (c,
4301 "HOSTKEY", &keyfile)))
4303 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4305 ("Core service is lacking key configuration settings. Exiting.\n"));
4306 GNUNET_SCHEDULER_shutdown ();
4309 peerinfo = GNUNET_PEERINFO_connect (cfg);
4310 if (NULL == peerinfo)
4312 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4313 _("Could not access PEERINFO service. Exiting.\n"));
4314 GNUNET_SCHEDULER_shutdown ();
4315 GNUNET_free (keyfile);
4318 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4319 GNUNET_free (keyfile);
4320 if (my_private_key == NULL)
4322 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4323 _("Core service could not access hostkey. Exiting.\n"));
4324 GNUNET_PEERINFO_disconnect (peerinfo);
4325 GNUNET_SCHEDULER_shutdown ();
4328 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4329 GNUNET_CRYPTO_hash (&my_public_key,
4330 sizeof (my_public_key), &my_identity.hashPubKey);
4331 /* setup notification */
4332 notifier = GNUNET_SERVER_notification_context_create (server,
4334 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
4335 /* setup transport connection */
4336 transport = GNUNET_TRANSPORT_connect (cfg,
4339 &handle_transport_receive,
4340 &handle_transport_notify_connect,
4341 &handle_transport_notify_disconnect);
4342 GNUNET_assert (NULL != transport);
4343 stats = GNUNET_STATISTICS_create ("core", cfg);
4345 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded CORE_SEND requests"), 0, GNUNET_NO);
4346 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 0, GNUNET_NO);
4348 mst = GNUNET_SERVER_mst_create (&deliver_message,
4350 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
4351 &cleaning_task, NULL);
4352 /* process client requests */
4353 GNUNET_SERVER_add_handlers (server, handlers);
4354 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4355 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
4361 * The main function for the transport service.
4363 * @param argc number of arguments from the command line
4364 * @param argv command line arguments
4365 * @return 0 ok, 1 on error
4368 main (int argc, char *const *argv)
4370 return (GNUNET_OK ==
4371 GNUNET_SERVICE_run (argc,
4374 GNUNET_SERVICE_OPTION_NONE,
4375 &run, NULL)) ? 0 : 1;
4378 /* end of gnunet-service-core.c */