2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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22 * @file core/gnunet-service-core.c
23 * @brief high-level P2P messaging
24 * @author Christian Grothoff
26 * 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
397 * We keep neighbours in a linked list (for now).
399 struct Neighbour *next;
402 * Unencrypted messages destined for this peer.
404 struct MessageEntry *messages;
407 * Head of the batched, encrypted message queue (already ordered,
408 * transmit starting with the head).
410 struct MessageEntry *encrypted_head;
413 * Tail of the batched, encrypted message queue (already ordered,
414 * append new messages to tail)
416 struct MessageEntry *encrypted_tail;
419 * Handle for pending requests for transmission to this peer
420 * with the transport service. NULL if no request is pending.
422 struct GNUNET_TRANSPORT_TransmitHandle *th;
425 * Public key of the neighbour, NULL if we don't have it yet.
427 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
430 * We received a PING message before we got the "public_key"
431 * (or the SET_KEY). We keep it here until we have a key
432 * to decrypt it. NULL if no PING is pending.
434 struct PingMessage *pending_ping;
437 * We received a PONG message before we got the "public_key"
438 * (or the SET_KEY). We keep it here until we have a key
439 * to decrypt it. NULL if no PONG is pending.
441 struct PongMessage *pending_pong;
444 * Non-NULL if we are currently looking up HELLOs for this peer.
447 struct GNUNET_PEERINFO_IteratorContext *pitr;
450 * SetKeyMessage to transmit, NULL if we are not currently trying
453 struct SetKeyMessage *skm;
456 * Identity of the neighbour.
458 struct GNUNET_PeerIdentity peer;
461 * Key we use to encrypt our messages for the other peer
462 * (initialized by us when we do the handshake).
464 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
467 * Key we use to decrypt messages from the other peer
468 * (given to us by the other peer during the handshake).
470 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
473 * ID of task used for re-trying plaintext scheduling.
475 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
478 * ID of task used for re-trying SET_KEY and PING message.
480 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
483 * ID of task used for updating bandwidth quota for this neighbour.
485 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
488 * ID of task used for sending keep-alive pings.
490 GNUNET_SCHEDULER_TaskIdentifier keep_alive_task;
493 * ID of task used for cleaning up dead neighbour entries.
495 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
498 * At what time did we generate our encryption key?
500 struct GNUNET_TIME_Absolute encrypt_key_created;
503 * At what time did the other peer generate the decryption key?
505 struct GNUNET_TIME_Absolute decrypt_key_created;
508 * At what time did we initially establish (as in, complete session
509 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
511 struct GNUNET_TIME_Absolute time_established;
514 * At what time did we last receive an encrypted message from the
515 * other peer? Should be zero if status != KEY_CONFIRMED.
517 struct GNUNET_TIME_Absolute last_activity;
520 * Last latency observed from this peer.
522 struct GNUNET_TIME_Relative last_latency;
525 * At what frequency are we currently re-trying SET_KEY messages?
527 struct GNUNET_TIME_Relative set_key_retry_frequency;
530 * Tracking bandwidth for sending to this peer.
532 struct GNUNET_BANDWIDTH_Tracker available_send_window;
535 * Tracking bandwidth for receiving from this peer.
537 struct GNUNET_BANDWIDTH_Tracker available_recv_window;
540 * How valueable were the messages of this peer recently?
542 unsigned long long current_preference;
545 * Bit map indicating which of the 32 sequence numbers before the last
546 * were received (good for accepting out-of-order packets and
547 * estimating reliability of the connection)
549 unsigned int last_packets_bitmap;
552 * last sequence number received on this connection (highest)
554 uint32_t last_sequence_number_received;
557 * last sequence number transmitted
559 uint32_t last_sequence_number_sent;
562 * Available bandwidth in for this peer (current target).
564 struct GNUNET_BANDWIDTH_Value32NBO bw_in;
567 * Available bandwidth out for this peer (current target).
569 struct GNUNET_BANDWIDTH_Value32NBO bw_out;
572 * Internal bandwidth limit set for this peer (initially typically
573 * set to "-1"). Actual "bw_out" is MIN of
574 * "bpm_out_internal_limit" and "bw_out_external_limit".
576 struct GNUNET_BANDWIDTH_Value32NBO bw_out_internal_limit;
579 * External bandwidth limit set for this peer by the
580 * peer that we are communicating with. "bw_out" is MIN of
581 * "bw_out_internal_limit" and "bw_out_external_limit".
583 struct GNUNET_BANDWIDTH_Value32NBO bw_out_external_limit;
586 * What was our PING challenge number (for this peer)?
588 uint32_t ping_challenge;
591 * What was the last distance to this peer as reported by the transports?
593 uint32_t last_distance;
596 * What is our connection status?
598 enum PeerStateMachine status;
601 * Are we currently connected to this neighbour?
609 * Data structure for each client connected to the core service.
614 * Clients are kept in a linked list.
619 * Handle for the client with the server API.
621 struct GNUNET_SERVER_Client *client_handle;
624 * Array of the types of messages this peer cares
625 * about (with "tcnt" entries). Allocated as part
626 * of this client struct, do not free!
628 const uint16_t *types;
631 * Options for messages this client cares about,
632 * see GNUNET_CORE_OPTION_ values.
637 * Number of types of incoming messages this client
638 * specifically cares about. Size of the "types" array.
648 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
653 static struct GNUNET_PeerIdentity my_identity;
658 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
663 struct GNUNET_SCHEDULER_Handle *sched;
666 * Handle to peerinfo service.
668 static struct GNUNET_PEERINFO_Handle *peerinfo;
671 * Our message stream tokenizer (for encrypted payload).
673 static struct GNUNET_SERVER_MessageStreamTokenizer *mst;
678 const struct GNUNET_CONFIGURATION_Handle *cfg;
683 static struct GNUNET_TRANSPORT_Handle *transport;
686 * Linked list of our clients.
688 static struct Client *clients;
691 * Context for notifications we need to send to our clients.
693 static struct GNUNET_SERVER_NotificationContext *notifier;
696 * We keep neighbours in a linked list (for now).
698 static struct Neighbour *neighbours;
701 * For creating statistics.
703 static struct GNUNET_STATISTICS_Handle *stats;
706 * Sum of all preferences among all neighbours.
708 static unsigned long long preference_sum;
711 * Total number of neighbours we have.
713 static unsigned int neighbour_count;
716 * How much inbound bandwidth are we supposed to be using per second?
717 * FIXME: this value is not used!
719 static unsigned long long bandwidth_target_in_bps;
722 * How much outbound bandwidth are we supposed to be using per second?
724 static unsigned long long bandwidth_target_out_bps;
727 * Derive an authentication key from "set key" information
730 derive_auth_key (struct GNUNET_CRYPTO_AuthKey *akey,
731 const struct GNUNET_CRYPTO_AesSessionKey *skey,
733 struct GNUNET_TIME_Absolute creation_time)
735 static const char ctx[] = "authentication key";
736 struct GNUNET_TIME_AbsoluteNBO ctbe;
739 ctbe = GNUNET_TIME_absolute_hton (creation_time);
740 GNUNET_CRYPTO_hmac_derive_key (akey,
754 * Derive an IV from packet information
757 derive_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
758 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
759 const struct GNUNET_PeerIdentity *identity)
761 static const char ctx[] = "initialization vector";
763 GNUNET_CRYPTO_aes_derive_iv (iv,
767 &identity->hashPubKey.bits,
768 sizeof(identity->hashPubKey.bits),
774 * Derive an IV from pong packet information
777 derive_pong_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
778 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
779 uint32_t challenge, const struct GNUNET_PeerIdentity *identity)
781 static const char ctx[] = "pong initialization vector";
783 GNUNET_CRYPTO_aes_derive_iv (iv,
787 &identity->hashPubKey.bits,
788 sizeof(identity->hashPubKey.bits),
797 * A preference value for a neighbour was update. Update
798 * the preference sum accordingly.
800 * @param inc how much was a preference value increased?
803 update_preference_sum (unsigned long long inc)
806 unsigned long long os;
809 preference_sum += inc;
810 if (preference_sum >= os)
812 /* overflow! compensate by cutting all values in half! */
817 n->current_preference /= 2;
818 preference_sum += n->current_preference;
821 GNUNET_STATISTICS_set (stats, gettext_noop ("# total peer preference"), preference_sum, GNUNET_NO);
826 * Find the entry for the given neighbour.
828 * @param peer identity of the neighbour
829 * @return NULL if we are not connected, otherwise the
832 static struct Neighbour *
833 find_neighbour (const struct GNUNET_PeerIdentity *peer)
835 struct Neighbour *ret;
838 while ((ret != NULL) &&
839 (0 != memcmp (&ret->peer,
840 peer, sizeof (struct GNUNET_PeerIdentity))))
847 * Send a message to one of our clients.
849 * @param client target for the message
850 * @param msg message to transmit
851 * @param can_drop could this message be dropped if the
852 * client's queue is getting too large?
855 send_to_client (struct Client *client,
856 const struct GNUNET_MessageHeader *msg,
859 #if DEBUG_CORE_CLIENT
860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
861 "Preparing to send %u bytes of message of type %u to client.\n",
862 (unsigned int) ntohs (msg->size),
863 (unsigned int) ntohs (msg->type));
865 GNUNET_SERVER_notification_context_unicast (notifier,
866 client->client_handle,
873 * Send a message to all of our current clients that have
874 * the right options set.
876 * @param msg message to multicast
877 * @param can_drop can this message be discarded if the queue is too long
878 * @param options mask to use
881 send_to_all_clients (const struct GNUNET_MessageHeader *msg,
890 if (0 != (c->options & options))
892 #if DEBUG_CORE_CLIENT
893 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
894 "Sending message of type %u to client.\n",
895 (unsigned int) ntohs (msg->type));
897 send_to_client (c, msg, can_drop);
905 * Function called by transport telling us that a peer
908 * @param n the peer that changed status
911 handle_peer_status_change (struct Neighbour *n)
913 struct PeerStatusNotifyMessage psnm;
915 if (! n->is_connected)
918 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
919 "Peer `%4s' changed status\n",
920 GNUNET_i2s (&n->peer));
922 psnm.header.size = htons (sizeof (struct PeerStatusNotifyMessage));
923 psnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE);
924 psnm.distance = htonl (n->last_distance);
925 psnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
926 psnm.timeout = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_add (n->last_activity,
927 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
928 psnm.bandwidth_in = n->bw_in;
929 psnm.bandwidth_out = n->bw_out;
931 send_to_all_clients (&psnm.header,
933 GNUNET_CORE_OPTION_SEND_STATUS_CHANGE);
934 GNUNET_STATISTICS_update (stats,
935 gettext_noop ("# peer status changes"),
941 * Handle CORE_ITERATE_PEERS request.
944 handle_client_iterate_peers (void *cls,
945 struct GNUNET_SERVER_Client *client,
946 const struct GNUNET_MessageHeader *message)
949 struct ConnectNotifyMessage cnm;
950 struct GNUNET_MessageHeader done_msg;
951 struct GNUNET_SERVER_TransmitContext *tc;
953 /* notify new client about existing neighbours */
954 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
955 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
956 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
957 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
958 tc = GNUNET_SERVER_transmit_context_create (client);
962 if (n->status == PEER_STATE_KEY_CONFIRMED)
964 #if DEBUG_CORE_CLIENT
965 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
966 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
968 cnm.distance = htonl (n->last_distance);
969 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
971 GNUNET_SERVER_transmit_context_append_message (tc, &cnm.header);
972 /*send_to_client (c, &cnm.header, GNUNET_NO);*/
977 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
978 GNUNET_SERVER_transmit_context_run (tc,
979 GNUNET_TIME_UNIT_FOREVER_REL);
984 * Handle CORE_INIT request.
987 handle_client_init (void *cls,
988 struct GNUNET_SERVER_Client *client,
989 const struct GNUNET_MessageHeader *message)
991 const struct InitMessage *im;
992 struct InitReplyMessage irm;
995 const uint16_t *types;
998 struct ConnectNotifyMessage cnm;
1001 #if DEBUG_CORE_CLIENT
1002 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1003 "Client connecting to core service with `%s' message\n",
1006 /* check that we don't have an entry already */
1010 if (client == c->client_handle)
1013 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1018 msize = ntohs (message->size);
1019 if (msize < sizeof (struct InitMessage))
1022 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1025 GNUNET_SERVER_notification_context_add (notifier, client);
1026 im = (const struct InitMessage *) message;
1027 types = (const uint16_t *) &im[1];
1028 msize -= sizeof (struct InitMessage);
1029 c = GNUNET_malloc (sizeof (struct Client) + msize);
1030 c->client_handle = client;
1033 c->tcnt = msize / sizeof (uint16_t);
1034 c->types = (const uint16_t *) &c[1];
1035 wtypes = (uint16_t *) &c[1];
1036 for (i=0;i<c->tcnt;i++)
1037 wtypes[i] = ntohs (types[i]);
1038 c->options = ntohl (im->options);
1039 #if DEBUG_CORE_CLIENT
1040 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1041 "Client %p is interested in %u message types\n",
1043 (unsigned int) c->tcnt);
1045 /* send init reply message */
1046 irm.header.size = htons (sizeof (struct InitReplyMessage));
1047 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
1048 irm.reserved = htonl (0);
1049 memcpy (&irm.publicKey,
1051 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1052 #if DEBUG_CORE_CLIENT
1053 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1054 "Sending `%s' message to client.\n", "INIT_REPLY");
1056 send_to_client (c, &irm.header, GNUNET_NO);
1057 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
1059 /* notify new client about existing neighbours */
1060 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
1061 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1065 if (n->status == PEER_STATE_KEY_CONFIRMED)
1067 #if DEBUG_CORE_CLIENT
1068 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1069 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
1071 cnm.distance = htonl (n->last_distance);
1072 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
1074 send_to_client (c, &cnm.header, GNUNET_NO);
1079 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1084 * A client disconnected, clean up.
1086 * @param cls closure
1087 * @param client identification of the client
1090 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
1093 struct Client *prev;
1097 #if DEBUG_CORE_CLIENT
1098 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1099 "Client %p has disconnected from core service.\n",
1106 if (client == pos->client_handle)
1109 clients = pos->next;
1111 prev->next = pos->next;
1118 /* client never sent INIT */
1123 * Handle REQUEST_INFO request.
1126 handle_client_request_info (void *cls,
1127 struct GNUNET_SERVER_Client *client,
1128 const struct GNUNET_MessageHeader *message)
1130 const struct RequestInfoMessage *rcm;
1131 struct Neighbour *n;
1132 struct ConfigurationInfoMessage cim;
1133 int32_t want_reserv;
1135 unsigned long long old_preference;
1136 struct GNUNET_SERVER_TransmitContext *tc;
1138 #if DEBUG_CORE_CLIENT
1139 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1140 "Core service receives `%s' request.\n", "REQUEST_INFO");
1142 rcm = (const struct RequestInfoMessage *) message;
1143 n = find_neighbour (&rcm->peer);
1144 memset (&cim, 0, sizeof (cim));
1147 want_reserv = ntohl (rcm->reserve_inbound);
1148 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1150 n->bw_out_internal_limit = rcm->limit_outbound;
1151 if (n->bw_out.value__ != GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1152 n->bw_out_external_limit).value__)
1154 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1155 n->bw_out_external_limit);
1156 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1158 GNUNET_TRANSPORT_set_quota (transport,
1162 GNUNET_TIME_UNIT_FOREVER_REL,
1164 handle_peer_status_change (n);
1167 if (want_reserv < 0)
1169 got_reserv = want_reserv;
1171 else if (want_reserv > 0)
1173 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1174 want_reserv).rel_value == 0)
1175 got_reserv = want_reserv;
1177 got_reserv = 0; /* all or nothing */
1181 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1183 old_preference = n->current_preference;
1184 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1185 if (old_preference > n->current_preference)
1187 /* overflow; cap at maximum value */
1188 n->current_preference = ULLONG_MAX;
1190 update_preference_sum (n->current_preference - old_preference);
1191 #if DEBUG_CORE_QUOTA
1192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1193 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1195 GNUNET_i2s (&rcm->peer),
1198 cim.reserved_amount = htonl (got_reserv);
1199 cim.bw_in = n->bw_in;
1200 cim.bw_out = n->bw_out;
1201 cim.preference = n->current_preference;
1203 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1204 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1205 cim.peer = rcm->peer;
1207 #if DEBUG_CORE_CLIENT
1208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1209 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1211 tc = GNUNET_SERVER_transmit_context_create (client);
1212 GNUNET_SERVER_transmit_context_append_message (tc, &cim.header);
1213 GNUNET_SERVER_transmit_context_run (tc,
1214 GNUNET_TIME_UNIT_FOREVER_REL);
1219 * Free the given entry for the neighbour (it has
1220 * already been removed from the list at this point).
1222 * @param n neighbour to free
1225 free_neighbour (struct Neighbour *n)
1227 struct MessageEntry *m;
1230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1231 "Destroying neighbour entry for peer `%4s'\n",
1232 GNUNET_i2s (&n->peer));
1234 if (n->pitr != NULL)
1236 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1241 GNUNET_free (n->skm);
1244 while (NULL != (m = n->messages))
1246 n->messages = m->next;
1249 while (NULL != (m = n->encrypted_head))
1251 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1258 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1261 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1262 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1263 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1264 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
1265 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1266 GNUNET_SCHEDULER_cancel (sched, n->quota_update_task);
1267 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1268 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1269 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1270 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
1271 if (n->status == PEER_STATE_KEY_CONFIRMED)
1272 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), -1, GNUNET_NO);
1273 GNUNET_free_non_null (n->public_key);
1274 GNUNET_free_non_null (n->pending_ping);
1275 GNUNET_free_non_null (n->pending_pong);
1281 * Check if we have encrypted messages for the specified neighbour
1282 * pending, and if so, check with the transport about sending them
1285 * @param n neighbour to check.
1287 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1291 * Encrypt size bytes from in and write the result to out. Use the
1292 * key for outbound traffic of the given neighbour.
1294 * @param n neighbour we are sending to
1295 * @param iv initialization vector to use
1296 * @param in ciphertext
1297 * @param out plaintext
1298 * @param size size of in/out
1299 * @return GNUNET_OK on success
1302 do_encrypt (struct Neighbour *n,
1303 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1304 const void *in, void *out, size_t size)
1306 if (size != (uint16_t) size)
1311 GNUNET_assert (size ==
1312 GNUNET_CRYPTO_aes_encrypt (in,
1316 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1318 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1319 "Encrypted %u bytes for `%4s' using key %u, IV %u\n",
1320 (unsigned int) size,
1321 GNUNET_i2s (&n->peer),
1322 (unsigned int) n->encrypt_key.crc32,
1323 GNUNET_CRYPTO_crc32_n (iv, sizeof(iv)));
1330 * Consider freeing the given neighbour since we may not need
1331 * to keep it around anymore.
1333 * @param n neighbour to consider discarding
1336 consider_free_neighbour (struct Neighbour *n);
1340 * Task triggered when a neighbour entry is about to time out
1341 * (and we should prevent this by sending a PING).
1343 * @param cls the 'struct Neighbour'
1344 * @param tc scheduler context (not used)
1347 send_keep_alive (void *cls,
1348 const struct GNUNET_SCHEDULER_TaskContext *tc)
1350 struct Neighbour *n = cls;
1351 struct GNUNET_TIME_Relative retry;
1352 struct GNUNET_TIME_Relative left;
1353 struct MessageEntry *me;
1354 struct PingMessage pp;
1355 struct PingMessage *pm;
1356 struct GNUNET_CRYPTO_AesInitializationVector iv;
1358 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1360 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1361 sizeof (struct PingMessage));
1362 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1363 me->priority = PING_PRIORITY;
1364 me->size = sizeof (struct PingMessage);
1365 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1369 pm = (struct PingMessage *) &me[1];
1370 pm->header.size = htons (sizeof (struct PingMessage));
1371 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1372 pm->iv_seed = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1374 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
1375 pp.challenge = n->ping_challenge;
1376 pp.target = n->peer;
1378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1379 "Encrypting `%s' message with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
1381 (unsigned int) n->ping_challenge,
1382 GNUNET_i2s (&n->peer),
1383 (unsigned int) n->encrypt_key.crc32,
1384 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
1391 sizeof (struct PingMessage) -
1392 ((void *) &pm->target - (void *) pm));
1393 process_encrypted_neighbour_queue (n);
1394 /* reschedule PING job */
1395 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1396 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1397 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1398 MIN_PING_FREQUENCY);
1400 = GNUNET_SCHEDULER_add_delayed (sched,
1409 * Task triggered when a neighbour entry might have gotten stale.
1411 * @param cls the 'struct Neighbour'
1412 * @param tc scheduler context (not used)
1415 consider_free_task (void *cls,
1416 const struct GNUNET_SCHEDULER_TaskContext *tc)
1418 struct Neighbour *n = cls;
1420 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1421 consider_free_neighbour (n);
1426 * Consider freeing the given neighbour since we may not need
1427 * to keep it around anymore.
1429 * @param n neighbour to consider discarding
1432 consider_free_neighbour (struct Neighbour *n)
1434 struct Neighbour *pos;
1435 struct Neighbour *prev;
1436 struct GNUNET_TIME_Relative left;
1438 if ( (n->th != NULL) ||
1439 (n->pitr != NULL) ||
1440 (GNUNET_YES == n->is_connected) )
1441 return; /* no chance */
1443 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1444 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1445 if (left.rel_value > 0)
1447 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1448 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1449 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
1451 &consider_free_task,
1455 /* actually free the neighbour... */
1464 neighbours = n->next;
1466 prev->next = n->next;
1467 GNUNET_assert (neighbour_count > 0);
1469 GNUNET_STATISTICS_set (stats,
1470 gettext_noop ("# neighbour entries allocated"),
1478 * Function called when the transport service is ready to
1479 * receive an encrypted message for the respective peer
1481 * @param cls neighbour to use message from
1482 * @param size number of bytes we can transmit
1483 * @param buf where to copy the message
1484 * @return number of bytes transmitted
1487 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1489 struct Neighbour *n = cls;
1490 struct MessageEntry *m;
1495 m = n->encrypted_head;
1499 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1500 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1501 GNUNET_i2s (&n->peer));
1505 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1512 GNUNET_assert (size >= m->size);
1513 memcpy (cbuf, &m[1], m->size);
1515 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1518 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1519 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1520 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1522 GNUNET_i2s (&n->peer));
1524 process_encrypted_neighbour_queue (n);
1529 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1530 "Transmission of message of type %u and size %u failed\n",
1531 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1532 (unsigned int) m->size);
1536 consider_free_neighbour (n);
1542 * Check if we have plaintext messages for the specified neighbour
1543 * pending, and if so, consider batching and encrypting them (and
1544 * then trigger processing of the encrypted queue if needed).
1546 * @param n neighbour to check.
1548 static void process_plaintext_neighbour_queue (struct Neighbour *n);
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.
1559 process_encrypted_neighbour_queue (struct Neighbour *n)
1561 struct MessageEntry *m;
1564 return; /* request already pending */
1565 m = n->encrypted_head;
1568 /* encrypted queue empty, try plaintext instead */
1569 process_plaintext_neighbour_queue (n);
1573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1574 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1575 (unsigned int) m->size,
1576 GNUNET_i2s (&n->peer),
1577 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
1580 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1583 GNUNET_TIME_absolute_get_remaining
1585 ¬ify_encrypted_transmit_ready,
1589 /* message request too large or duplicate request */
1591 /* discard encrypted message */
1592 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1596 process_encrypted_neighbour_queue (n);
1602 * Decrypt size bytes from in and write the result to out. Use the
1603 * key for inbound traffic of the given neighbour. This function does
1604 * NOT do any integrity-checks on the result.
1606 * @param n neighbour we are receiving from
1607 * @param iv initialization vector to use
1608 * @param in ciphertext
1609 * @param out plaintext
1610 * @param size size of in/out
1611 * @return GNUNET_OK on success
1614 do_decrypt (struct Neighbour *n,
1615 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1616 const void *in, void *out, size_t size)
1618 if (size != (uint16_t) size)
1623 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1624 (n->status != PEER_STATE_KEY_CONFIRMED))
1626 GNUNET_break_op (0);
1627 return GNUNET_SYSERR;
1630 GNUNET_CRYPTO_aes_decrypt (in,
1637 return GNUNET_SYSERR;
1639 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes decrypted"), size, GNUNET_NO);
1641 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1642 "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
1643 (unsigned int) size,
1644 GNUNET_i2s (&n->peer),
1645 (unsigned int) n->decrypt_key.crc32,
1646 GNUNET_CRYPTO_crc32_n (iv, sizeof(*iv)));
1653 * Select messages for transmission. This heuristic uses a combination
1654 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1655 * and priority-based discard (in case no feasible schedule exist) and
1656 * speculative optimization (defer any kind of transmission until
1657 * we either create a batch of significant size, 25% of max, or until
1658 * we are close to a deadline). Furthermore, when scheduling the
1659 * heuristic also packs as many messages into the batch as possible,
1660 * starting with those with the earliest deadline. Yes, this is fun.
1662 * @param n neighbour to select messages from
1663 * @param size number of bytes to select for transmission
1664 * @param retry_time set to the time when we should try again
1665 * (only valid if this function returns zero)
1666 * @return number of bytes selected, or 0 if we decided to
1667 * defer scheduling overall; in that case, retry_time is set.
1670 select_messages (struct Neighbour *n,
1671 size_t size, struct GNUNET_TIME_Relative *retry_time)
1673 struct MessageEntry *pos;
1674 struct MessageEntry *min;
1675 struct MessageEntry *last;
1676 unsigned int min_prio;
1677 struct GNUNET_TIME_Absolute t;
1678 struct GNUNET_TIME_Absolute now;
1679 struct GNUNET_TIME_Relative delta;
1681 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
1684 unsigned int queue_size;
1685 int discard_low_prio;
1687 GNUNET_assert (NULL != n->messages);
1688 now = GNUNET_TIME_absolute_get ();
1689 /* last entry in linked list of messages processed */
1691 /* should we remove the entry with the lowest
1692 priority from consideration for scheduling at the
1703 discard_low_prio = GNUNET_YES;
1704 while (GNUNET_YES == discard_low_prio)
1707 min_prio = UINT_MAX;
1708 discard_low_prio = GNUNET_NO;
1709 /* calculate number of bytes available for transmission at time "t" */
1710 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
1712 /* how many bytes have we (hypothetically) scheduled so far */
1714 /* maximum time we can wait before transmitting anything
1715 and still make all of our deadlines */
1716 slack = GNUNET_TIME_UNIT_FOREVER_REL;
1718 /* note that we use "*2" here because we want to look
1719 a bit further into the future; much more makes no
1720 sense since new message might be scheduled in the
1722 while ((pos != NULL) && (off < size * 2))
1724 if (pos->do_transmit == GNUNET_YES)
1726 /* already removed from consideration */
1730 if (discard_low_prio == GNUNET_NO)
1732 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
1733 if (delta.rel_value > 0)
1735 // FIXME: HUH? Check!
1737 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
1740 if (avail < pos->size)
1742 // FIXME: HUH? Check!
1743 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1748 /* update slack, considering both its absolute deadline
1749 and relative deadlines caused by other messages
1750 with their respective load */
1751 slack = GNUNET_TIME_relative_min (slack,
1752 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
1754 if (pos->deadline.abs_value <= now.abs_value)
1757 slack = GNUNET_TIME_UNIT_ZERO;
1759 else if (GNUNET_YES == pos->got_slack)
1761 /* should be soon now! */
1762 slack = GNUNET_TIME_relative_min (slack,
1763 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
1768 GNUNET_TIME_relative_min (slack,
1769 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
1770 pos->got_slack = GNUNET_YES;
1771 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
1772 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
1777 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
1778 if (pos->priority <= min_prio)
1780 /* update min for discard */
1781 min_prio = pos->priority;
1786 if (discard_low_prio)
1788 GNUNET_assert (min != NULL);
1789 /* remove lowest-priority entry from consideration */
1790 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1794 /* guard against sending "tiny" messages with large headers without
1796 if ( (slack.rel_value > GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value) &&
1798 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
1800 /* less than 25% of message would be filled with deadlines still
1801 being met if we delay by one second or more; so just wait for
1802 more data; but do not wait longer than 1s (since we don't want
1803 to delay messages for a really long time either). */
1804 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
1805 /* reset do_transmit values for next time */
1808 pos->do_transmit = GNUNET_NO;
1811 GNUNET_STATISTICS_update (stats,
1812 gettext_noop ("# transmissions delayed due to corking"),
1815 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1816 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
1817 (unsigned long long) retry_time->rel_value,
1819 (unsigned int) size);
1823 /* select marked messages (up to size) for transmission */
1828 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
1830 pos->do_transmit = GNUNET_YES; /* mark for transmission */
1834 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1835 "Selecting message of size %u for transmission\n",
1836 (unsigned int) pos->size);
1842 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1843 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
1844 (unsigned int) pos->size,
1847 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
1852 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1853 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
1854 (unsigned long long) off, (unsigned long long) tsize,
1855 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
1856 GNUNET_i2s (&n->peer));
1863 * Batch multiple messages into a larger buffer.
1865 * @param n neighbour to take messages from
1866 * @param buf target buffer
1867 * @param size size of buf
1868 * @param deadline set to transmission deadline for the result
1869 * @param retry_time set to the time when we should try again
1870 * (only valid if this function returns zero)
1871 * @param priority set to the priority of the batch
1872 * @return number of bytes written to buf (can be zero)
1875 batch_message (struct Neighbour *n,
1878 struct GNUNET_TIME_Absolute *deadline,
1879 struct GNUNET_TIME_Relative *retry_time,
1880 unsigned int *priority)
1882 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1883 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
1884 struct MessageEntry *pos;
1885 struct MessageEntry *prev;
1886 struct MessageEntry *next;
1891 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1892 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
1893 if (0 == select_messages (n, size, retry_time))
1896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1897 "No messages selected, will try again in %llu ms\n",
1898 retry_time->rel_value);
1902 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
1903 ntm->distance = htonl (n->last_distance);
1904 ntm->latency = GNUNET_TIME_relative_hton (n->last_latency);
1905 ntm->peer = n->peer;
1908 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
1911 if (GNUNET_YES == pos->do_transmit)
1913 GNUNET_assert (pos->size <= size);
1914 /* do notifications */
1915 /* FIXME: track if we have *any* client that wants
1916 full notifications and only do this if that is
1918 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
1920 memcpy (&ntm[1], &pos[1], pos->size);
1921 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1922 sizeof (struct GNUNET_MessageHeader));
1923 send_to_all_clients (&ntm->header,
1925 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
1929 /* message too large for 'full' notifications, we do at
1930 least the 'hdr' type */
1933 sizeof (struct GNUNET_MessageHeader));
1935 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1937 send_to_all_clients (&ntm->header,
1939 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
1941 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1942 "Encrypting %u bytes with message of type %u and size %u\n",
1944 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
1945 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
1947 /* copy for encrypted transmission */
1948 memcpy (&buf[ret], &pos[1], pos->size);
1951 *priority += pos->priority;
1953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1954 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
1955 (unsigned int) pos->size,
1956 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).rel_value);
1958 deadline->abs_value = GNUNET_MIN (deadline->abs_value, pos->deadline.abs_value);
1972 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1973 "Deadline for message batch is %llu ms\n",
1974 GNUNET_TIME_absolute_get_remaining (*deadline).rel_value);
1981 * Remove messages with deadlines that have long expired from
1984 * @param n neighbour to inspect
1987 discard_expired_messages (struct Neighbour *n)
1989 struct MessageEntry *prev;
1990 struct MessageEntry *next;
1991 struct MessageEntry *pos;
1992 struct GNUNET_TIME_Absolute now;
1993 struct GNUNET_TIME_Relative delta;
1995 now = GNUNET_TIME_absolute_get ();
2001 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
2002 if (delta.rel_value > PAST_EXPIRATION_DISCARD_TIME.rel_value)
2005 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2006 "Message is %llu ms past due, discarding.\n",
2023 * Signature of the main function of a task.
2025 * @param cls closure
2026 * @param tc context information (why was this task triggered now)
2029 retry_plaintext_processing (void *cls,
2030 const struct GNUNET_SCHEDULER_TaskContext *tc)
2032 struct Neighbour *n = cls;
2034 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2035 process_plaintext_neighbour_queue (n);
2040 * Send our key (and encrypted PING) to the other peer.
2042 * @param n the other peer
2044 static void send_key (struct Neighbour *n);
2047 * Task that will retry "send_key" if our previous attempt failed
2051 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2053 struct Neighbour *n = cls;
2056 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2057 "Retrying key transmission to `%4s'\n",
2058 GNUNET_i2s (&n->peer));
2060 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2061 n->set_key_retry_frequency =
2062 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
2068 * Check if we have plaintext messages for the specified neighbour
2069 * pending, and if so, consider batching and encrypting them (and
2070 * then trigger processing of the encrypted queue if needed).
2072 * @param n neighbour to check.
2075 process_plaintext_neighbour_queue (struct Neighbour *n)
2077 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
2079 struct EncryptedMessage *em; /* encrypted message */
2080 struct EncryptedMessage *ph; /* plaintext header */
2081 struct MessageEntry *me;
2082 unsigned int priority;
2083 struct GNUNET_TIME_Absolute deadline;
2084 struct GNUNET_TIME_Relative retry_time;
2085 struct GNUNET_CRYPTO_AesInitializationVector iv;
2086 struct GNUNET_CRYPTO_AuthKey auth_key;
2088 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
2090 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
2091 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2095 case PEER_STATE_DOWN:
2098 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2099 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2100 GNUNET_i2s(&n->peer));
2103 case PEER_STATE_KEY_SENT:
2104 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2105 n->retry_set_key_task
2106 = GNUNET_SCHEDULER_add_delayed (sched,
2107 n->set_key_retry_frequency,
2108 &set_key_retry_task, n);
2110 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2111 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2112 GNUNET_i2s(&n->peer));
2115 case PEER_STATE_KEY_RECEIVED:
2116 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2117 n->retry_set_key_task
2118 = GNUNET_SCHEDULER_add_delayed (sched,
2119 n->set_key_retry_frequency,
2120 &set_key_retry_task, n);
2122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2123 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2124 GNUNET_i2s(&n->peer));
2127 case PEER_STATE_KEY_CONFIRMED:
2128 /* ready to continue */
2131 discard_expired_messages (n);
2132 if (n->messages == NULL)
2135 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2136 "Plaintext message queue for `%4s' is empty.\n",
2137 GNUNET_i2s(&n->peer));
2139 return; /* no pending messages */
2141 if (n->encrypted_head != NULL)
2144 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2145 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2146 GNUNET_i2s(&n->peer));
2148 return; /* wait for messages already encrypted to be
2151 ph = (struct EncryptedMessage *) pbuf;
2152 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2154 used = sizeof (struct EncryptedMessage);
2155 used += batch_message (n,
2157 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2158 &deadline, &retry_time, &priority);
2159 if (used == sizeof (struct EncryptedMessage))
2162 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2163 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2164 GNUNET_i2s(&n->peer));
2166 /* no messages selected for sending, try again later... */
2167 n->retry_plaintext_task =
2168 GNUNET_SCHEDULER_add_delayed (sched,
2170 &retry_plaintext_processing, n);
2173 #if DEBUG_CORE_QUOTA
2174 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2175 "Sending %u b/s as new limit to peer `%4s'\n",
2176 (unsigned int) ntohl (n->bw_in.value__),
2177 GNUNET_i2s (&n->peer));
2179 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
2180 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2181 ph->inbound_bw_limit = n->bw_in;
2182 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2184 /* setup encryption message header */
2185 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2186 me->deadline = deadline;
2187 me->priority = priority;
2189 em = (struct EncryptedMessage *) &me[1];
2190 em->header.size = htons (used);
2191 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2192 em->iv_seed = ph->iv_seed;
2193 derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
2196 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2197 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2198 (unsigned int) used - ENCRYPTED_HEADER_SIZE,
2199 GNUNET_i2s(&n->peer),
2200 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).rel_value);
2202 GNUNET_assert (GNUNET_OK ==
2205 &ph->sequence_number,
2206 &em->sequence_number, used - ENCRYPTED_HEADER_SIZE));
2207 derive_auth_key (&auth_key,
2210 n->encrypt_key_created);
2211 GNUNET_CRYPTO_hmac (&auth_key,
2212 &em->sequence_number,
2213 used - ENCRYPTED_HEADER_SIZE,
2216 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2217 "Authenticated %u bytes of ciphertext %u: `%s'\n",
2218 used - ENCRYPTED_HEADER_SIZE,
2219 GNUNET_CRYPTO_crc32_n (&em->sequence_number,
2220 used - ENCRYPTED_HEADER_SIZE),
2221 GNUNET_h2s (&em->hmac));
2223 /* append to transmission list */
2224 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2228 process_encrypted_neighbour_queue (n);
2233 * Function that recalculates the bandwidth quota for the
2234 * given neighbour and transmits it to the transport service.
2236 * @param cls neighbour for the quota update
2240 neighbour_quota_update (void *cls,
2241 const struct GNUNET_SCHEDULER_TaskContext *tc);
2245 * Schedule the task that will recalculate the bandwidth
2246 * quota for this peer (and possibly force a disconnect of
2247 * idle peers by calculating a bandwidth of zero).
2250 schedule_quota_update (struct Neighbour *n)
2252 GNUNET_assert (n->quota_update_task ==
2253 GNUNET_SCHEDULER_NO_TASK);
2254 n->quota_update_task
2255 = GNUNET_SCHEDULER_add_delayed (sched,
2256 QUOTA_UPDATE_FREQUENCY,
2257 &neighbour_quota_update,
2263 * Initialize a new 'struct Neighbour'.
2265 * @param pid ID of the new neighbour
2266 * @return handle for the new neighbour
2268 static struct Neighbour *
2269 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2271 struct Neighbour *n;
2272 struct GNUNET_TIME_Absolute now;
2275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2276 "Creating neighbour entry for peer `%4s'\n",
2279 n = GNUNET_malloc (sizeof (struct Neighbour));
2280 n->next = neighbours;
2283 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
2285 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2286 now = GNUNET_TIME_absolute_get ();
2287 n->encrypt_key_created = now;
2288 n->last_activity = now;
2289 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2290 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2291 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2292 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2293 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2294 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
2296 neighbour_quota_update (n, NULL);
2297 consider_free_neighbour (n);
2303 * Handle CORE_SEND request.
2306 * @param client the client issuing the request
2307 * @param message the "struct SendMessage"
2310 handle_client_send (void *cls,
2311 struct GNUNET_SERVER_Client *client,
2312 const struct GNUNET_MessageHeader *message)
2314 const struct SendMessage *sm;
2315 struct Neighbour *n;
2316 struct MessageEntry *prev;
2317 struct MessageEntry *pos;
2318 struct MessageEntry *e;
2319 struct MessageEntry *min_prio_entry;
2320 struct MessageEntry *min_prio_prev;
2321 unsigned int min_prio;
2322 unsigned int queue_size;
2325 msize = ntohs (message->size);
2327 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2329 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));
2332 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2335 sm = (const struct SendMessage *) message;
2336 msize -= sizeof (struct SendMessage);
2337 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2339 /* FIXME: should we not allow loopback-injection here? */
2342 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2345 n = find_neighbour (&sm->peer);
2347 n = create_neighbour (&sm->peer);
2349 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2350 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2352 (unsigned int) msize,
2353 GNUNET_i2s (&sm->peer));
2355 /* bound queue size */
2356 discard_expired_messages (n);
2357 min_prio = UINT32_MAX;
2358 min_prio_entry = NULL;
2359 min_prio_prev = NULL;
2365 if (pos->priority <= min_prio)
2367 min_prio_entry = pos;
2368 min_prio_prev = prev;
2369 min_prio = pos->priority;
2375 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2378 if (ntohl(sm->priority) <= min_prio)
2380 /* discard new entry */
2382 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2383 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2385 (unsigned int) MAX_PEER_QUEUE_SIZE,
2386 (unsigned int) msize,
2387 (unsigned int) ntohs (message->type));
2389 GNUNET_STATISTICS_update (stats, gettext_noop ("# discarded CORE_SEND requests"), 1, GNUNET_NO);
2392 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2395 GNUNET_assert (min_prio_entry != NULL);
2396 /* discard "min_prio_entry" */
2398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2399 "Queue full, discarding existing older request\n");
2401 GNUNET_STATISTICS_update (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 1, GNUNET_NO);
2402 if (min_prio_prev == NULL)
2403 n->messages = min_prio_entry->next;
2405 min_prio_prev->next = min_prio_entry->next;
2406 GNUNET_free (min_prio_entry);
2410 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2411 "Adding transmission request for `%4s' of size %u to queue\n",
2412 GNUNET_i2s (&sm->peer),
2413 (unsigned int) msize);
2415 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2416 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2417 e->priority = ntohl (sm->priority);
2419 memcpy (&e[1], &sm[1], msize);
2421 /* insert, keep list sorted by deadline */
2424 while ((pos != NULL) && (pos->deadline.abs_value < e->deadline.abs_value))
2435 /* consider scheduling now */
2436 process_plaintext_neighbour_queue (n);
2438 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2443 * Function called when the transport service is ready to
2444 * receive a message. Only resets 'n->th' to NULL.
2446 * @param cls neighbour to use message from
2447 * @param size number of bytes we can transmit
2448 * @param buf where to copy the message
2449 * @return number of bytes transmitted
2452 notify_transport_connect_done (void *cls, size_t size, void *buf)
2454 struct Neighbour *n = cls;
2456 if (GNUNET_YES != n->is_connected)
2458 /* transport should only call us to transmit a message after
2459 * telling us about a successful connection to the respective peer */
2460 n->th = NULL; /* If this happens because of a timeout, reset n-th so another message may be sent for this peer! */
2462 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Timeout on notify connect!\n");
2469 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2470 _("Failed to connect to `%4s': transport failed to connect\n"),
2471 GNUNET_i2s (&n->peer));
2474 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2475 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2476 GNUNET_i2s (&n->peer));
2477 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2478 GNUNET_SCHEDULER_cancel (sched,
2479 n->retry_set_key_task);
2480 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (sched,
2481 &set_key_retry_task,
2488 * Handle CORE_REQUEST_CONNECT request.
2491 * @param client the client issuing the request
2492 * @param message the "struct ConnectMessage"
2495 handle_client_request_connect (void *cls,
2496 struct GNUNET_SERVER_Client *client,
2497 const struct GNUNET_MessageHeader *message)
2499 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2500 struct Neighbour *n;
2501 struct GNUNET_TIME_Relative timeout;
2503 if (0 == memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2506 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2509 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2510 n = find_neighbour (&cm->peer);
2512 n = create_neighbour (&cm->peer);
2513 if ( (GNUNET_YES == n->is_connected) ||
2516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2517 "Core received `%s' request for `%4s', already connected!\n",
2519 GNUNET_i2s (&cm->peer));
2520 return; /* already connected, or at least trying */
2522 GNUNET_STATISTICS_update (stats, gettext_noop ("# connection requests received"), 1, GNUNET_NO);
2524 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2525 "Core received `%s' request for `%4s', will try to establish connection\n",
2527 GNUNET_i2s (&cm->peer));
2529 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2530 /* ask transport to connect to the peer */
2531 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2533 sizeof (struct GNUNET_MessageHeader), 0,
2535 ¬ify_transport_connect_done,
2537 GNUNET_break (NULL != n->th);
2542 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2543 * the neighbour's struct and retry send_key. Or, if we did not get a
2544 * HELLO, just do nothing.
2546 * @param cls the 'struct Neighbour' to retry sending the key for
2547 * @param peer the peer for which this is the HELLO
2548 * @param hello HELLO message of that peer
2551 process_hello_retry_send_key (void *cls,
2552 const struct GNUNET_PeerIdentity *peer,
2553 const struct GNUNET_HELLO_Message *hello)
2555 struct Neighbour *n = cls;
2560 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2561 "Entered `%s' and `%s' is NULL!\n",
2562 "process_hello_retry_send_key",
2566 if (n->public_key != NULL)
2568 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2570 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2571 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2573 GNUNET_STATISTICS_update (stats,
2574 gettext_noop ("# SET_KEY messages deferred (need public key)"),
2582 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2583 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
2584 GNUNET_i2s (&n->peer));
2586 GNUNET_STATISTICS_update (stats,
2587 gettext_noop ("# Delayed connecting due to lack of public key"),
2590 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2591 n->retry_set_key_task
2592 = GNUNET_SCHEDULER_add_delayed (sched,
2593 n->set_key_retry_frequency,
2594 &set_key_retry_task, n);
2600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2601 "Entered `%s' for peer `%4s'\n",
2602 "process_hello_retry_send_key",
2605 if (n->public_key != NULL)
2607 /* already have public key, why are we here? */
2613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2614 "Received new `%s' message for `%4s', initiating key exchange.\n",
2619 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2620 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2622 GNUNET_STATISTICS_update (stats,
2623 gettext_noop ("# Error extracting public key from HELLO"),
2626 GNUNET_free (n->public_key);
2627 n->public_key = NULL;
2629 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2630 "GNUNET_HELLO_get_key returned awfully\n");
2638 * Send our key (and encrypted PING) to the other peer.
2640 * @param n the other peer
2643 send_key (struct Neighbour *n)
2645 struct MessageEntry *pos;
2646 struct SetKeyMessage *sm;
2647 struct MessageEntry *me;
2648 struct PingMessage pp;
2649 struct PingMessage *pm;
2650 struct GNUNET_CRYPTO_AesInitializationVector iv;
2652 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2654 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2655 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2657 if (n->pitr != NULL)
2660 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2661 "Key exchange in progress with `%4s'.\n",
2662 GNUNET_i2s (&n->peer));
2664 return; /* already in progress */
2666 if (GNUNET_YES != n->is_connected)
2669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2670 "Not yet connected to peer `%4s'!\n",
2671 GNUNET_i2s (&n->peer));
2675 GNUNET_STATISTICS_update (stats,
2676 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
2679 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2681 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
2683 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2684 ¬ify_encrypted_transmit_ready,
2690 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2691 "Asked to perform key exchange with `%4s'.\n",
2692 GNUNET_i2s (&n->peer));
2694 if (n->public_key == NULL)
2696 /* lookup n's public key, then try again */
2698 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2699 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2700 GNUNET_i2s (&n->peer));
2702 GNUNET_assert (n->pitr == NULL);
2703 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
2705 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2706 &process_hello_retry_send_key, n);
2709 pos = n->encrypted_head;
2712 if (GNUNET_YES == pos->is_setkey)
2714 if (pos->sender_status == n->status)
2717 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2718 "`%s' message for `%4s' queued already\n",
2720 GNUNET_i2s (&n->peer));
2722 goto trigger_processing;
2724 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
2729 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2730 "Removing queued `%s' message for `%4s', will create a new one\n",
2732 GNUNET_i2s (&n->peer));
2742 case PEER_STATE_DOWN:
2743 n->status = PEER_STATE_KEY_SENT;
2745 case PEER_STATE_KEY_SENT:
2747 case PEER_STATE_KEY_RECEIVED:
2749 case PEER_STATE_KEY_CONFIRMED:
2757 /* first, set key message */
2758 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2759 sizeof (struct SetKeyMessage) +
2760 sizeof (struct PingMessage));
2761 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
2762 me->priority = SET_KEY_PRIORITY;
2763 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
2764 me->is_setkey = GNUNET_YES;
2765 me->got_slack = GNUNET_YES; /* do not defer this one! */
2766 me->sender_status = n->status;
2767 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2771 sm = (struct SetKeyMessage *) &me[1];
2772 sm->header.size = htons (sizeof (struct SetKeyMessage));
2773 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
2774 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
2775 PEER_STATE_KEY_SENT : n->status));
2777 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2778 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2779 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2780 sizeof (struct GNUNET_PeerIdentity));
2781 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
2782 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
2783 sm->target = n->peer;
2784 GNUNET_assert (GNUNET_OK ==
2785 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
2787 GNUNET_CRYPTO_AesSessionKey),
2789 &sm->encrypted_key));
2790 GNUNET_assert (GNUNET_OK ==
2791 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
2793 pm = (struct PingMessage *) &sm[1];
2794 pm->header.size = htons (sizeof (struct PingMessage));
2795 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
2796 pm->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
2797 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
2798 pp.challenge = n->ping_challenge;
2799 pp.target = n->peer;
2801 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2802 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
2804 (unsigned int) n->ping_challenge,
2805 GNUNET_i2s (&n->peer),
2806 (unsigned int) n->encrypt_key.crc32,
2807 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
2814 sizeof (struct PingMessage) -
2815 ((void *) &pm->target - (void *) pm));
2816 GNUNET_STATISTICS_update (stats,
2817 gettext_noop ("# SET_KEY and PING messages created"),
2821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2822 "Have %llu ms left for `%s' transmission.\n",
2823 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).rel_value,
2827 /* trigger queue processing */
2828 process_encrypted_neighbour_queue (n);
2829 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
2830 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
2831 n->retry_set_key_task
2832 = GNUNET_SCHEDULER_add_delayed (sched,
2833 n->set_key_retry_frequency,
2834 &set_key_retry_task, n);
2839 * We received a SET_KEY message. Validate and update
2840 * our key material and status.
2842 * @param n the neighbour from which we received message m
2843 * @param m the set key message we received
2846 handle_set_key (struct Neighbour *n,
2847 const struct SetKeyMessage *m);
2851 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2852 * the neighbour's struct and retry handling the set_key message. Or,
2853 * if we did not get a HELLO, just free the set key message.
2855 * @param cls pointer to the set key message
2856 * @param peer the peer for which this is the HELLO
2857 * @param hello HELLO message of that peer
2860 process_hello_retry_handle_set_key (void *cls,
2861 const struct GNUNET_PeerIdentity *peer,
2862 const struct GNUNET_HELLO_Message *hello)
2864 struct Neighbour *n = cls;
2865 struct SetKeyMessage *sm = n->skm;
2871 if (n->public_key != NULL)
2874 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2875 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
2877 GNUNET_i2s (&n->peer),
2880 handle_set_key (n, sm);
2884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2885 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
2887 GNUNET_i2s (&n->peer));
2892 if (n->public_key != NULL)
2893 return; /* multiple HELLOs match!? */
2895 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2896 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2898 GNUNET_break_op (0);
2899 GNUNET_free (n->public_key);
2900 n->public_key = NULL;
2906 * We received a PING message. Validate and transmit
2909 * @param n sender of the PING
2910 * @param m the encrypted PING message itself
2913 handle_ping (struct Neighbour *n, const struct PingMessage *m)
2915 struct PingMessage t;
2916 struct PongMessage tx;
2917 struct PongMessage *tp;
2918 struct MessageEntry *me;
2919 struct GNUNET_CRYPTO_AesInitializationVector iv;
2922 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2923 "Core service receives `%s' request from `%4s'.\n",
2924 "PING", GNUNET_i2s (&n->peer));
2926 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
2932 sizeof (struct PingMessage) -
2933 ((void *) &m->target - (void *) m)))
2936 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2937 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
2939 GNUNET_i2s (&t.target),
2940 (unsigned int) t.challenge,
2941 (unsigned int) n->decrypt_key.crc32,
2942 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
2945 GNUNET_STATISTICS_update (stats,
2946 gettext_noop ("# PING messages decrypted"),
2949 if (0 != memcmp (&t.target,
2950 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2952 GNUNET_break_op (0);
2955 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2956 sizeof (struct PongMessage));
2957 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2961 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
2962 me->priority = PONG_PRIORITY;
2963 me->size = sizeof (struct PongMessage);
2964 tx.inbound_bw_limit = n->bw_in;
2965 tx.challenge = t.challenge;
2966 tx.target = t.target;
2967 tp = (struct PongMessage *) &me[1];
2968 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
2969 tp->header.size = htons (sizeof (struct PongMessage));
2970 tp->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
2971 derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
2976 sizeof (struct PongMessage) -
2977 ((void *) &tp->challenge - (void *) tp));
2978 GNUNET_STATISTICS_update (stats,
2979 gettext_noop ("# PONG messages created"),
2983 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2984 "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
2986 (unsigned int) t.challenge,
2987 (unsigned int) n->encrypt_key.crc32,
2988 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
2991 /* trigger queue processing */
2992 process_encrypted_neighbour_queue (n);
2997 * We received a PONG message. Validate and update our status.
2999 * @param n sender of the PONG
3000 * @param m the encrypted PONG message itself
3003 handle_pong (struct Neighbour *n,
3004 const struct PongMessage *m)
3006 struct PongMessage t;
3007 struct ConnectNotifyMessage cnm;
3008 struct GNUNET_CRYPTO_AesInitializationVector iv;
3011 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3012 "Core service receives `%s' response from `%4s'.\n",
3013 "PONG", GNUNET_i2s (&n->peer));
3015 /* mark as garbage, just to be sure */
3016 memset (&t, 255, sizeof (t));
3017 derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
3024 sizeof (struct PongMessage) -
3025 ((void *) &m->challenge - (void *) m)))
3027 GNUNET_break_op (0);
3030 GNUNET_STATISTICS_update (stats,
3031 gettext_noop ("# PONG messages decrypted"),
3035 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3036 "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
3038 GNUNET_i2s (&t.target),
3039 (unsigned int) t.challenge,
3040 (unsigned int) n->decrypt_key.crc32,
3041 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3044 if ((0 != memcmp (&t.target,
3046 sizeof (struct GNUNET_PeerIdentity))) ||
3047 (n->ping_challenge != t.challenge))
3049 /* PONG malformed */
3051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3052 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
3054 GNUNET_i2s (&n->peer),
3055 (unsigned int) n->ping_challenge);
3056 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3057 "Received malformed `%s' received from `%4s' with challenge %u\n",
3058 "PONG", GNUNET_i2s (&t.target),
3059 (unsigned int) t.challenge);
3061 GNUNET_break_op (0);
3066 case PEER_STATE_DOWN:
3067 GNUNET_break (0); /* should be impossible */
3069 case PEER_STATE_KEY_SENT:
3070 GNUNET_break (0); /* should be impossible, how did we decrypt? */
3072 case PEER_STATE_KEY_RECEIVED:
3073 GNUNET_STATISTICS_update (stats,
3074 gettext_noop ("# Session keys confirmed via PONG"),
3077 n->status = PEER_STATE_KEY_CONFIRMED;
3078 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
3080 n->bw_out_external_limit = t.inbound_bw_limit;
3081 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3082 n->bw_out_internal_limit);
3083 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3085 GNUNET_TRANSPORT_set_quota (transport,
3089 GNUNET_TIME_UNIT_FOREVER_REL,
3093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3094 "Confirmed key via `%s' message for peer `%4s'\n",
3095 "PONG", GNUNET_i2s (&n->peer));
3097 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3099 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
3100 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3102 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
3103 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
3104 cnm.distance = htonl (n->last_distance);
3105 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
3107 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
3108 process_encrypted_neighbour_queue (n);
3110 case PEER_STATE_KEY_CONFIRMED:
3111 n->last_activity = GNUNET_TIME_absolute_get ();
3112 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3113 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3115 = GNUNET_SCHEDULER_add_delayed (sched,
3116 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3119 handle_peer_status_change (n);
3129 * We received a SET_KEY message. Validate and update
3130 * our key material and status.
3132 * @param n the neighbour from which we received message m
3133 * @param m the set key message we received
3136 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
3138 struct SetKeyMessage *m_cpy;
3139 struct GNUNET_TIME_Absolute t;
3140 struct GNUNET_CRYPTO_AesSessionKey k;
3141 struct PingMessage *ping;
3142 struct PongMessage *pong;
3143 enum PeerStateMachine sender_status;
3146 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3147 "Core service receives `%s' request from `%4s'.\n",
3148 "SET_KEY", GNUNET_i2s (&n->peer));
3150 if (n->public_key == NULL)
3152 if (n->pitr != NULL)
3155 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3156 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3162 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3163 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3165 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3166 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3167 /* lookup n's public key, then try again */
3168 GNUNET_assert (n->skm == NULL);
3170 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3172 GNUNET_TIME_UNIT_MINUTES,
3173 &process_hello_retry_handle_set_key, n);
3174 GNUNET_STATISTICS_update (stats,
3175 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3180 if (0 != memcmp (&m->target,
3182 sizeof (struct GNUNET_PeerIdentity)))
3184 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3185 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3187 GNUNET_i2s (&m->target));
3190 if ((ntohl (m->purpose.size) !=
3191 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3192 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3193 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3194 sizeof (struct GNUNET_PeerIdentity)) ||
3196 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3197 &m->purpose, &m->signature, n->public_key)))
3199 /* invalid signature */
3200 GNUNET_break_op (0);
3203 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3204 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3205 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3206 (t.abs_value < n->decrypt_key_created.abs_value))
3208 /* this could rarely happen due to massive re-ordering of
3209 messages on the network level, but is most likely either
3210 a bug or some adversary messing with us. Report. */
3211 GNUNET_break_op (0);
3215 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3216 "Decrypting key material.\n");
3218 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3221 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3222 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3223 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3225 /* failed to decrypt !? */
3226 GNUNET_break_op (0);
3229 GNUNET_STATISTICS_update (stats,
3230 gettext_noop ("# SET_KEY messages decrypted"),
3234 if (n->decrypt_key_created.abs_value != t.abs_value)
3236 /* fresh key, reset sequence numbers */
3237 n->last_sequence_number_received = 0;
3238 n->last_packets_bitmap = 0;
3239 n->decrypt_key_created = t;
3241 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3244 case PEER_STATE_DOWN:
3245 n->status = PEER_STATE_KEY_RECEIVED;
3247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3248 "Responding to `%s' with my own key.\n", "SET_KEY");
3252 case PEER_STATE_KEY_SENT:
3253 case PEER_STATE_KEY_RECEIVED:
3254 n->status = PEER_STATE_KEY_RECEIVED;
3255 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3256 (sender_status != PEER_STATE_KEY_CONFIRMED))
3259 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3260 "Responding to `%s' with my own key (other peer has status %u).\n",
3262 (unsigned int) sender_status);
3267 case PEER_STATE_KEY_CONFIRMED:
3268 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3269 (sender_status != PEER_STATE_KEY_CONFIRMED))
3272 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3273 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3275 (unsigned int) sender_status);
3284 if (n->pending_ping != NULL)
3286 ping = n->pending_ping;
3287 n->pending_ping = NULL;
3288 handle_ping (n, ping);
3291 if (n->pending_pong != NULL)
3293 pong = n->pending_pong;
3294 n->pending_pong = NULL;
3295 handle_pong (n, pong);
3302 * Send a P2P message to a client.
3304 * @param sender who sent us the message?
3305 * @param client who should we give the message to?
3306 * @param m contains the message to transmit
3307 * @param msize number of bytes in buf to transmit
3310 send_p2p_message_to_client (struct Neighbour *sender,
3311 struct Client *client,
3312 const void *m, size_t msize)
3314 char buf[msize + sizeof (struct NotifyTrafficMessage)];
3315 struct NotifyTrafficMessage *ntm;
3318 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3319 "Core service passes message from `%4s' of type %u to client.\n",
3320 GNUNET_i2s(&sender->peer),
3321 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3323 ntm = (struct NotifyTrafficMessage *) buf;
3324 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
3325 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3326 ntm->distance = htonl (sender->last_distance);
3327 ntm->latency = GNUNET_TIME_relative_hton (sender->last_latency);
3328 ntm->peer = sender->peer;
3329 memcpy (&ntm[1], m, msize);
3330 send_to_client (client, &ntm->header, GNUNET_YES);
3335 * Deliver P2P message to interested clients.
3337 * @param cls always NULL
3338 * @param client who sent us the message (struct Neighbour)
3339 * @param m the message
3342 deliver_message (void *cls,
3344 const struct GNUNET_MessageHeader *m)
3346 struct Neighbour *sender = client;
3347 size_t msize = ntohs (m->size);
3349 struct Client *cpos;
3355 type = ntohs (m->type);
3357 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3358 "Received encapsulated message of type %u and size %u from `%4s'\n",
3359 (unsigned int) type,
3361 GNUNET_i2s (&sender->peer));
3363 GNUNET_snprintf (buf,
3365 gettext_noop ("# bytes of messages of type %u received"),
3366 (unsigned int) type);
3367 GNUNET_STATISTICS_set (stats,
3371 dropped = GNUNET_YES;
3373 while (cpos != NULL)
3375 deliver_full = GNUNET_NO;
3376 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
3377 deliver_full = GNUNET_YES;
3380 for (tpos = 0; tpos < cpos->tcnt; tpos++)
3382 if (type != cpos->types[tpos])
3384 deliver_full = GNUNET_YES;
3388 if (GNUNET_YES == deliver_full)
3390 send_p2p_message_to_client (sender, cpos, m, msize);
3391 dropped = GNUNET_NO;
3393 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
3395 send_p2p_message_to_client (sender, cpos, m,
3396 sizeof (struct GNUNET_MessageHeader));
3400 if (dropped == GNUNET_YES)
3403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3404 "Message of type %u from `%4s' not delivered to any client.\n",
3405 (unsigned int) type,
3406 GNUNET_i2s (&sender->peer));
3408 GNUNET_STATISTICS_update (stats,
3409 gettext_noop ("# messages not delivered to any client"),
3416 * We received an encrypted message. Decrypt, validate and
3417 * pass on to the appropriate clients.
3420 handle_encrypted_message (struct Neighbour *n,
3421 const struct EncryptedMessage *m)
3423 size_t size = ntohs (m->header.size);
3425 struct EncryptedMessage *pt; /* plaintext */
3428 struct GNUNET_TIME_Absolute t;
3429 struct GNUNET_CRYPTO_AesInitializationVector iv;
3430 struct GNUNET_CRYPTO_AuthKey auth_key;
3433 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3434 "Core service receives `%s' request from `%4s'.\n",
3435 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
3438 derive_auth_key (&auth_key,
3441 n->decrypt_key_created);
3442 GNUNET_CRYPTO_hmac (&auth_key,
3443 &m->sequence_number,
3444 size - ENCRYPTED_HEADER_SIZE, &ph);
3446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3447 "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
3448 (unsigned int) size - ENCRYPTED_HEADER_SIZE,
3449 GNUNET_CRYPTO_crc32_n (&m->sequence_number,
3450 size - ENCRYPTED_HEADER_SIZE),
3454 if (0 != memcmp (&ph,
3456 sizeof (GNUNET_HashCode)))
3458 /* checksum failed */
3459 GNUNET_break_op (0);
3462 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3467 &m->sequence_number,
3468 &buf[ENCRYPTED_HEADER_SIZE],
3469 size - ENCRYPTED_HEADER_SIZE))
3471 pt = (struct EncryptedMessage *) buf;
3473 /* validate sequence number */
3474 snum = ntohl (pt->sequence_number);
3475 if (n->last_sequence_number_received == snum)
3477 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3478 "Received duplicate message, ignoring.\n");
3479 /* duplicate, ignore */
3480 GNUNET_STATISTICS_set (stats,
3481 gettext_noop ("# bytes dropped (duplicates)"),
3486 if ((n->last_sequence_number_received > snum) &&
3487 (n->last_sequence_number_received - snum > 32))
3489 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3490 "Received ancient out of sequence message, ignoring.\n");
3491 /* ancient out of sequence, ignore */
3492 GNUNET_STATISTICS_set (stats,
3493 gettext_noop ("# bytes dropped (out of sequence)"),
3498 if (n->last_sequence_number_received > snum)
3500 unsigned int rotbit =
3501 1 << (n->last_sequence_number_received - snum - 1);
3502 if ((n->last_packets_bitmap & rotbit) != 0)
3504 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3505 "Received duplicate message, ignoring.\n");
3506 GNUNET_STATISTICS_set (stats,
3507 gettext_noop ("# bytes dropped (duplicates)"),
3510 /* duplicate, ignore */
3513 n->last_packets_bitmap |= rotbit;
3515 if (n->last_sequence_number_received < snum)
3517 int shift = (snum - n->last_sequence_number_received);
3518 if (shift >= 8 * sizeof(n->last_packets_bitmap))
3519 n->last_packets_bitmap = 0;
3521 n->last_packets_bitmap <<= shift;
3522 n->last_sequence_number_received = snum;
3525 /* check timestamp */
3526 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
3527 if (GNUNET_TIME_absolute_get_duration (t).rel_value > MAX_MESSAGE_AGE.rel_value)
3529 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3531 ("Message received far too old (%llu ms). Content ignored.\n"),
3532 GNUNET_TIME_absolute_get_duration (t).rel_value);
3533 GNUNET_STATISTICS_set (stats,
3534 gettext_noop ("# bytes dropped (ancient message)"),
3540 /* process decrypted message(s) */
3541 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
3543 #if DEBUG_CORE_SET_QUOTA
3544 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3545 "Received %u b/s as new inbound limit for peer `%4s'\n",
3546 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
3547 GNUNET_i2s (&n->peer));
3549 n->bw_out_external_limit = pt->inbound_bw_limit;
3550 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3551 n->bw_out_internal_limit);
3552 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3554 GNUNET_TRANSPORT_set_quota (transport,
3558 GNUNET_TIME_UNIT_FOREVER_REL,
3561 n->last_activity = GNUNET_TIME_absolute_get ();
3562 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3563 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3565 = GNUNET_SCHEDULER_add_delayed (sched,
3566 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3569 GNUNET_STATISTICS_set (stats,
3570 gettext_noop ("# bytes of payload decrypted"),
3571 size - sizeof (struct EncryptedMessage),
3573 handle_peer_status_change (n);
3574 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
3576 &buf[sizeof (struct EncryptedMessage)],
3577 size - sizeof (struct EncryptedMessage),
3578 GNUNET_YES, GNUNET_NO))
3579 GNUNET_break_op (0);
3584 * Function called by the transport for each received message.
3586 * @param cls closure
3587 * @param peer (claimed) identity of the other peer
3588 * @param message the message
3589 * @param latency estimated latency for communicating with the
3590 * given peer (round-trip)
3591 * @param distance in overlay hops, as given by transport plugin
3594 handle_transport_receive (void *cls,
3595 const struct GNUNET_PeerIdentity *peer,
3596 const struct GNUNET_MessageHeader *message,
3597 struct GNUNET_TIME_Relative latency,
3598 unsigned int distance)
3600 struct Neighbour *n;
3601 struct GNUNET_TIME_Absolute now;
3608 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3609 "Received message of type %u from `%4s', demultiplexing.\n",
3610 (unsigned int) ntohs (message->type),
3613 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3618 n = find_neighbour (peer);
3620 n = create_neighbour (peer);
3621 changed = (latency.rel_value != n->last_latency.rel_value) || (distance != n->last_distance);
3622 n->last_latency = latency;
3623 n->last_distance = distance;
3624 up = (n->status == PEER_STATE_KEY_CONFIRMED);
3625 type = ntohs (message->type);
3626 size = ntohs (message->size);
3629 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
3630 if (size != sizeof (struct SetKeyMessage))
3632 GNUNET_break_op (0);
3635 GNUNET_STATISTICS_update (stats, gettext_noop ("# session keys received"), 1, GNUNET_NO);
3636 handle_set_key (n, (const struct SetKeyMessage *) message);
3638 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3639 if (size < sizeof (struct EncryptedMessage) +
3640 sizeof (struct GNUNET_MessageHeader))
3642 GNUNET_break_op (0);
3645 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3646 (n->status != PEER_STATE_KEY_CONFIRMED))
3648 GNUNET_break_op (0);
3651 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3653 case GNUNET_MESSAGE_TYPE_CORE_PING:
3654 if (size != sizeof (struct PingMessage))
3656 GNUNET_break_op (0);
3659 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
3660 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3661 (n->status != PEER_STATE_KEY_CONFIRMED))
3664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3665 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3666 "PING", GNUNET_i2s (&n->peer));
3668 GNUNET_free_non_null (n->pending_ping);
3669 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3670 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3673 handle_ping (n, (const struct PingMessage *) message);
3675 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3676 if (size != sizeof (struct PongMessage))
3678 GNUNET_break_op (0);
3681 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
3682 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3683 (n->status != PEER_STATE_KEY_CONFIRMED) )
3686 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3687 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3688 "PONG", GNUNET_i2s (&n->peer));
3690 GNUNET_free_non_null (n->pending_pong);
3691 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
3692 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
3695 handle_pong (n, (const struct PongMessage *) message);
3698 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3699 _("Unsupported message of type %u received.\n"),
3700 (unsigned int) type);
3703 if (n->status == PEER_STATE_KEY_CONFIRMED)
3705 now = GNUNET_TIME_absolute_get ();
3706 n->last_activity = now;
3707 changed = GNUNET_YES;
3710 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), 1, GNUNET_NO);
3711 n->time_established = now;
3713 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3714 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3716 = GNUNET_SCHEDULER_add_delayed (sched,
3717 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3722 handle_peer_status_change (n);
3727 * Function that recalculates the bandwidth quota for the
3728 * given neighbour and transmits it to the transport service.
3730 * @param cls neighbour for the quota update
3734 neighbour_quota_update (void *cls,
3735 const struct GNUNET_SCHEDULER_TaskContext *tc)
3737 struct Neighbour *n = cls;
3738 struct GNUNET_BANDWIDTH_Value32NBO q_in;
3741 unsigned long long distributable;
3742 uint64_t need_per_peer;
3743 uint64_t need_per_second;
3746 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3747 "Neighbour quota update calculation running for peer `%4s'\n",
3748 GNUNET_i2s (&n->peer));
3750 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
3751 /* calculate relative preference among all neighbours;
3752 divides by a bit more to avoid division by zero AND to
3753 account for possibility of new neighbours joining any time
3754 AND to convert to double... */
3755 if (preference_sum == 0)
3757 pref_rel = 1.0 / (double) neighbour_count;
3761 pref_rel = n->current_preference / preference_sum;
3763 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
3764 GNUNET_TIME_UNIT_SECONDS);
3765 need_per_second = need_per_peer * neighbour_count;
3767 if (bandwidth_target_out_bps > need_per_second)
3768 distributable = bandwidth_target_out_bps - need_per_second;
3769 share = distributable * pref_rel;
3770 if (share + need_per_peer > UINT32_MAX)
3771 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
3773 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
3774 /* check if we want to disconnect for good due to inactivity */
3775 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) &&
3776 (GNUNET_TIME_absolute_get_duration (n->time_established).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) )
3779 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3780 "Forcing disconnect of `%4s' due to inactivity\n",
3781 GNUNET_i2s (&n->peer));
3783 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
3785 #if DEBUG_CORE_QUOTA
3786 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3787 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
3788 GNUNET_i2s (&n->peer),
3789 (unsigned int) ntohl (q_in.value__),
3790 bandwidth_target_out_bps,
3791 (unsigned int) ntohl (n->bw_in.value__),
3792 (unsigned int) ntohl (n->bw_out.value__),
3793 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
3795 if (n->bw_in.value__ != q_in.value__)
3798 if (GNUNET_YES == n->is_connected)
3799 GNUNET_TRANSPORT_set_quota (transport,
3803 GNUNET_TIME_UNIT_FOREVER_REL,
3805 handle_peer_status_change (n);
3807 schedule_quota_update (n);
3812 * Function called by transport to notify us that
3813 * a peer connected to us (on the network level).
3815 * @param cls closure
3816 * @param peer the peer that connected
3817 * @param latency current latency of the connection
3818 * @param distance in overlay hops, as given by transport plugin
3821 handle_transport_notify_connect (void *cls,
3822 const struct GNUNET_PeerIdentity *peer,
3823 struct GNUNET_TIME_Relative latency,
3824 unsigned int distance)
3826 struct Neighbour *n;
3828 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3833 n = find_neighbour (peer);
3836 if (GNUNET_YES == n->is_connected)
3838 /* duplicate connect notification!? */
3845 n = create_neighbour (peer);
3847 GNUNET_STATISTICS_update (stats,
3848 gettext_noop ("# peers connected (transport)"),
3851 n->is_connected = GNUNET_YES;
3852 n->last_latency = latency;
3853 n->last_distance = distance;
3854 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
3857 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
3861 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3862 "Received connection from `%4s'.\n",
3863 GNUNET_i2s (&n->peer));
3865 GNUNET_TRANSPORT_set_quota (transport,
3869 GNUNET_TIME_UNIT_FOREVER_REL,
3876 * Function called by transport telling us that a peer
3879 * @param cls closure
3880 * @param peer the peer that disconnected
3883 handle_transport_notify_disconnect (void *cls,
3884 const struct GNUNET_PeerIdentity *peer)
3886 struct DisconnectNotifyMessage cnm;
3887 struct Neighbour *n;
3888 struct GNUNET_TIME_Relative left;
3891 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3892 "Peer `%4s' disconnected from us; received notification from transport.\n", GNUNET_i2s (peer));
3895 n = find_neighbour (peer);
3901 GNUNET_break (n->is_connected);
3902 if (n->status == PEER_STATE_KEY_CONFIRMED)
3904 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
3905 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
3907 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
3909 n->is_connected = GNUNET_NO;
3910 GNUNET_STATISTICS_update (stats,
3911 gettext_noop ("# peers connected (transport)"),
3914 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
3915 GNUNET_SCHEDULER_cancel (sched,
3916 n->dead_clean_task);
3917 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3918 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
3919 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
3921 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
3922 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
3923 &consider_free_task,
3929 * Last task run during shutdown. Disconnects us from
3933 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3935 struct Neighbour *n;
3939 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3940 "Core service shutting down.\n");
3942 GNUNET_assert (transport != NULL);
3943 GNUNET_TRANSPORT_disconnect (transport);
3945 while (NULL != (n = neighbours))
3947 neighbours = n->next;
3948 GNUNET_assert (neighbour_count > 0);
3952 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
3953 GNUNET_SERVER_notification_context_destroy (notifier);
3955 while (NULL != (c = clients))
3956 handle_client_disconnect (NULL, c->client_handle);
3957 if (my_private_key != NULL)
3958 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3960 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3961 if (peerinfo != NULL)
3962 GNUNET_PEERINFO_disconnect (peerinfo);
3964 GNUNET_SERVER_mst_destroy (mst);
3969 * Initiate core service.
3971 * @param cls closure
3972 * @param s scheduler to use
3973 * @param server the initialized server
3974 * @param c configuration to use
3978 struct GNUNET_SCHEDULER_Handle *s,
3979 struct GNUNET_SERVER_Handle *server,
3980 const struct GNUNET_CONFIGURATION_Handle *c)
3982 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
3983 {&handle_client_init, NULL,
3984 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
3985 {&handle_client_request_info, NULL,
3986 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
3987 sizeof (struct RequestInfoMessage)},
3988 {&handle_client_iterate_peers, NULL,
3989 GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS,
3990 sizeof (struct GNUNET_MessageHeader)},
3991 {&handle_client_send, NULL,
3992 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
3993 {&handle_client_request_connect, NULL,
3994 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
3995 sizeof (struct ConnectMessage)},
4002 /* parse configuration */
4005 GNUNET_CONFIGURATION_get_value_number (c,
4008 &bandwidth_target_in_bps)) ||
4010 GNUNET_CONFIGURATION_get_value_number (c,
4013 &bandwidth_target_out_bps)) ||
4015 GNUNET_CONFIGURATION_get_value_filename (c,
4017 "HOSTKEY", &keyfile)))
4019 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4021 ("Core service is lacking key configuration settings. Exiting.\n"));
4022 GNUNET_SCHEDULER_shutdown (s);
4025 peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
4026 if (NULL == peerinfo)
4028 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4029 _("Could not access PEERINFO service. Exiting.\n"));
4030 GNUNET_SCHEDULER_shutdown (s);
4031 GNUNET_free (keyfile);
4034 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4035 GNUNET_free (keyfile);
4036 if (my_private_key == NULL)
4038 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4039 _("Core service could not access hostkey. Exiting.\n"));
4040 GNUNET_PEERINFO_disconnect (peerinfo);
4041 GNUNET_SCHEDULER_shutdown (s);
4044 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4045 GNUNET_CRYPTO_hash (&my_public_key,
4046 sizeof (my_public_key), &my_identity.hashPubKey);
4047 /* setup notification */
4048 notifier = GNUNET_SERVER_notification_context_create (server,
4050 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
4051 /* setup transport connection */
4052 transport = GNUNET_TRANSPORT_connect (sched,
4056 &handle_transport_receive,
4057 &handle_transport_notify_connect,
4058 &handle_transport_notify_disconnect);
4059 GNUNET_assert (NULL != transport);
4060 stats = GNUNET_STATISTICS_create (sched, "core", cfg);
4062 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded CORE_SEND requests"), 0, GNUNET_NO);
4063 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 0, GNUNET_NO);
4065 mst = GNUNET_SERVER_mst_create (&deliver_message,
4067 GNUNET_SCHEDULER_add_delayed (sched,
4068 GNUNET_TIME_UNIT_FOREVER_REL,
4069 &cleaning_task, NULL);
4070 /* process client requests */
4071 GNUNET_SERVER_add_handlers (server, handlers);
4072 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4073 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
4079 * The main function for the transport service.
4081 * @param argc number of arguments from the command line
4082 * @param argv command line arguments
4083 * @return 0 ok, 1 on error
4086 main (int argc, char *const *argv)
4088 return (GNUNET_OK ==
4089 GNUNET_SERVICE_run (argc,
4092 GNUNET_SERVICE_OPTION_NONE,
4093 &run, NULL)) ? 0 : 1;
4096 /* end of gnunet-service-core.c */