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_NO
50 * Receive and send buffer windows grow over time. For
51 * how long can 'unused' bandwidth accumulate before we
52 * need to cap it? (specified in seconds).
54 #define MAX_WINDOW_TIME_S (5 * 60)
57 * How many messages do we queue up at most for optional
58 * notifications to a client? (this can cause notifications
59 * about outgoing messages to be dropped).
61 #define MAX_NOTIFY_QUEUE 1024
64 * Minimum bandwidth (out) to assign to any connected peer.
65 * Should be rather low; values larger than DEFAULT_BW_IN_OUT make no
68 #define MIN_BANDWIDTH_PER_PEER GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT
71 * After how much time past the "official" expiration time do
72 * we discard messages? Should not be zero since we may
73 * intentionally defer transmission until close to the deadline
74 * and then may be slightly past the deadline due to inaccuracy
75 * in sleep and our own CPU consumption.
77 #define PAST_EXPIRATION_DISCARD_TIME GNUNET_TIME_UNIT_SECONDS
80 * What is the maximum delay for a SET_KEY message?
82 #define MAX_SET_KEY_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10)
85 * How long do we wait for SET_KEY confirmation initially?
87 #define INITIAL_SET_KEY_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 1)
90 * What is the maximum delay for a PING message?
92 #define MAX_PING_DELAY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 2)
95 * What is the maximum delay for a PONG message?
97 #define MAX_PONG_DELAY GNUNET_TIME_relative_multiply (MAX_PING_DELAY, 2)
100 * What is the minimum frequency for a PING message?
102 #define MIN_PING_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
105 * How often do we recalculate bandwidth quotas?
107 #define QUOTA_UPDATE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
110 * What is the priority for a SET_KEY message?
112 #define SET_KEY_PRIORITY 0xFFFFFF
115 * What is the priority for a PING message?
117 #define PING_PRIORITY 0xFFFFFF
120 * What is the priority for a PONG message?
122 #define PONG_PRIORITY 0xFFFFFF
125 * How many messages do we queue per peer at most? Must be at
128 #define MAX_PEER_QUEUE_SIZE 16
131 * How many non-mandatory messages do we queue per client at most?
133 #define MAX_CLIENT_QUEUE_SIZE 32
136 * What is the maximum age of a message for us to consider
137 * processing it? Note that this looks at the timestamp used
138 * by the other peer, so clock skew between machines does
139 * come into play here. So this should be picked high enough
140 * so that a little bit of clock skew does not prevent peers
141 * from connecting to us.
143 #define MAX_MESSAGE_AGE GNUNET_TIME_UNIT_DAYS
147 * State machine for our P2P encryption handshake. Everyone starts in
148 * "DOWN", if we receive the other peer's key (other peer initiated)
149 * we start in state RECEIVED (since we will immediately send our
150 * own); otherwise we start in SENT. If we get back a PONG from
151 * within either state, we move up to CONFIRMED (the PONG will always
152 * be sent back encrypted with the key we sent to the other peer).
154 enum PeerStateMachine
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).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));
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).
1581 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1584 GNUNET_TIME_absolute_get_remaining
1586 ¬ify_encrypted_transmit_ready,
1590 /* message request too large or duplicate request */
1592 /* discard encrypted message */
1593 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1597 process_encrypted_neighbour_queue (n);
1603 * Decrypt size bytes from in and write the result to out. Use the
1604 * key for inbound traffic of the given neighbour. This function does
1605 * NOT do any integrity-checks on the result.
1607 * @param n neighbour we are receiving from
1608 * @param iv initialization vector to use
1609 * @param in ciphertext
1610 * @param out plaintext
1611 * @param size size of in/out
1612 * @return GNUNET_OK on success
1615 do_decrypt (struct Neighbour *n,
1616 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1617 const void *in, void *out, size_t size)
1619 if (size != (uint16_t) size)
1624 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1625 (n->status != PEER_STATE_KEY_CONFIRMED))
1627 GNUNET_break_op (0);
1628 return GNUNET_SYSERR;
1631 GNUNET_CRYPTO_aes_decrypt (in,
1638 return GNUNET_SYSERR;
1640 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes decrypted"), size, GNUNET_NO);
1642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1643 "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
1644 (unsigned int) size,
1645 GNUNET_i2s (&n->peer),
1646 (unsigned int) n->decrypt_key.crc32,
1647 GNUNET_CRYPTO_crc32_n (iv, sizeof(*iv)));
1654 * Select messages for transmission. This heuristic uses a combination
1655 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1656 * and priority-based discard (in case no feasible schedule exist) and
1657 * speculative optimization (defer any kind of transmission until
1658 * we either create a batch of significant size, 25% of max, or until
1659 * we are close to a deadline). Furthermore, when scheduling the
1660 * heuristic also packs as many messages into the batch as possible,
1661 * starting with those with the earliest deadline. Yes, this is fun.
1663 * @param n neighbour to select messages from
1664 * @param size number of bytes to select for transmission
1665 * @param retry_time set to the time when we should try again
1666 * (only valid if this function returns zero)
1667 * @return number of bytes selected, or 0 if we decided to
1668 * defer scheduling overall; in that case, retry_time is set.
1671 select_messages (struct Neighbour *n,
1672 size_t size, struct GNUNET_TIME_Relative *retry_time)
1674 struct MessageEntry *pos;
1675 struct MessageEntry *min;
1676 struct MessageEntry *last;
1677 unsigned int min_prio;
1678 struct GNUNET_TIME_Absolute t;
1679 struct GNUNET_TIME_Absolute now;
1680 struct GNUNET_TIME_Relative delta;
1682 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
1685 unsigned int queue_size;
1686 int discard_low_prio;
1688 GNUNET_assert (NULL != n->messages);
1689 now = GNUNET_TIME_absolute_get ();
1690 /* last entry in linked list of messages processed */
1692 /* should we remove the entry with the lowest
1693 priority from consideration for scheduling at the
1704 discard_low_prio = GNUNET_YES;
1705 while (GNUNET_YES == discard_low_prio)
1708 min_prio = UINT_MAX;
1709 discard_low_prio = GNUNET_NO;
1710 /* calculate number of bytes available for transmission at time "t" */
1711 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
1713 /* how many bytes have we (hypothetically) scheduled so far */
1715 /* maximum time we can wait before transmitting anything
1716 and still make all of our deadlines */
1717 slack = GNUNET_TIME_UNIT_FOREVER_REL;
1719 /* note that we use "*2" here because we want to look
1720 a bit further into the future; much more makes no
1721 sense since new message might be scheduled in the
1723 while ((pos != NULL) && (off < size * 2))
1725 if (pos->do_transmit == GNUNET_YES)
1727 /* already removed from consideration */
1731 if (discard_low_prio == GNUNET_NO)
1733 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
1734 if (delta.value > 0)
1736 // FIXME: HUH? Check!
1738 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
1741 if (avail < pos->size)
1743 // FIXME: HUH? Check!
1744 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1749 /* update slack, considering both its absolute deadline
1750 and relative deadlines caused by other messages
1751 with their respective load */
1752 slack = GNUNET_TIME_relative_min (slack,
1753 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
1755 if (pos->deadline.value <= now.value)
1758 slack = GNUNET_TIME_UNIT_ZERO;
1760 else if (GNUNET_YES == pos->got_slack)
1762 /* should be soon now! */
1763 slack = GNUNET_TIME_relative_min (slack,
1764 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
1769 GNUNET_TIME_relative_min (slack,
1770 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
1771 pos->got_slack = GNUNET_YES;
1772 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
1773 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
1778 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
1779 if (pos->priority <= min_prio)
1781 /* update min for discard */
1782 min_prio = pos->priority;
1787 if (discard_low_prio)
1789 GNUNET_assert (min != NULL);
1790 /* remove lowest-priority entry from consideration */
1791 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1795 /* guard against sending "tiny" messages with large headers without
1797 if ( (slack.value > GNUNET_CONSTANTS_MAX_CORK_DELAY.value) &&
1799 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
1801 /* less than 25% of message would be filled with deadlines still
1802 being met if we delay by one second or more; so just wait for
1803 more data; but do not wait longer than 1s (since we don't want
1804 to delay messages for a really long time either). */
1805 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
1806 /* reset do_transmit values for next time */
1809 pos->do_transmit = GNUNET_NO;
1812 GNUNET_STATISTICS_update (stats,
1813 gettext_noop ("# transmissions delayed due to corking"),
1816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1817 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
1818 (unsigned long long) retry_time->value,
1820 (unsigned int) size);
1824 /* select marked messages (up to size) for transmission */
1829 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
1831 pos->do_transmit = GNUNET_YES; /* mark for transmission */
1835 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1836 "Selecting message of size %u for transmission\n",
1837 (unsigned int) pos->size);
1843 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1844 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
1845 (unsigned int) pos->size,
1848 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
1853 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1854 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
1855 (unsigned long long) off, (unsigned long long) tsize,
1856 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
1857 GNUNET_i2s (&n->peer));
1864 * Batch multiple messages into a larger buffer.
1866 * @param n neighbour to take messages from
1867 * @param buf target buffer
1868 * @param size size of buf
1869 * @param deadline set to transmission deadline for the result
1870 * @param retry_time set to the time when we should try again
1871 * (only valid if this function returns zero)
1872 * @param priority set to the priority of the batch
1873 * @return number of bytes written to buf (can be zero)
1876 batch_message (struct Neighbour *n,
1879 struct GNUNET_TIME_Absolute *deadline,
1880 struct GNUNET_TIME_Relative *retry_time,
1881 unsigned int *priority)
1883 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1884 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
1885 struct MessageEntry *pos;
1886 struct MessageEntry *prev;
1887 struct MessageEntry *next;
1892 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1893 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
1894 if (0 == select_messages (n, size, retry_time))
1897 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1898 "No messages selected, will try again in %llu ms\n",
1903 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
1904 ntm->distance = htonl (n->last_distance);
1905 ntm->latency = GNUNET_TIME_relative_hton (n->last_latency);
1906 ntm->peer = n->peer;
1909 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
1912 if (GNUNET_YES == pos->do_transmit)
1914 GNUNET_assert (pos->size <= size);
1915 /* do notifications */
1916 /* FIXME: track if we have *any* client that wants
1917 full notifications and only do this if that is
1919 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
1921 memcpy (&ntm[1], &pos[1], pos->size);
1922 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1923 sizeof (struct GNUNET_MessageHeader));
1924 send_to_all_clients (&ntm->header,
1926 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
1930 /* message too large for 'full' notifications, we do at
1931 least the 'hdr' type */
1934 sizeof (struct GNUNET_MessageHeader));
1936 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1938 send_to_all_clients (&ntm->header,
1940 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
1942 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1943 "Encrypting %u bytes with message of type %u and size %u\n",
1945 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
1946 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
1948 /* copy for encrypted transmission */
1949 memcpy (&buf[ret], &pos[1], pos->size);
1952 *priority += pos->priority;
1954 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1955 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
1956 (unsigned int) pos->size,
1957 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).value);
1959 deadline->value = GNUNET_MIN (deadline->value, pos->deadline.value);
1973 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1974 "Deadline for message batch is %llu ms\n",
1975 GNUNET_TIME_absolute_get_remaining (*deadline).value);
1982 * Remove messages with deadlines that have long expired from
1985 * @param n neighbour to inspect
1988 discard_expired_messages (struct Neighbour *n)
1990 struct MessageEntry *prev;
1991 struct MessageEntry *next;
1992 struct MessageEntry *pos;
1993 struct GNUNET_TIME_Absolute now;
1994 struct GNUNET_TIME_Relative delta;
1996 now = GNUNET_TIME_absolute_get ();
2002 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
2003 if (delta.value > PAST_EXPIRATION_DISCARD_TIME.value)
2006 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2007 "Message is %llu ms past due, discarding.\n",
2024 * Signature of the main function of a task.
2026 * @param cls closure
2027 * @param tc context information (why was this task triggered now)
2030 retry_plaintext_processing (void *cls,
2031 const struct GNUNET_SCHEDULER_TaskContext *tc)
2033 struct Neighbour *n = cls;
2035 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2036 process_plaintext_neighbour_queue (n);
2041 * Send our key (and encrypted PING) to the other peer.
2043 * @param n the other peer
2045 static void send_key (struct Neighbour *n);
2048 * Task that will retry "send_key" if our previous attempt failed
2052 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2054 struct Neighbour *n = cls;
2057 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2058 "Retrying key transmission to `%4s'\n",
2059 GNUNET_i2s (&n->peer));
2061 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2062 n->set_key_retry_frequency =
2063 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
2069 * Check if we have plaintext messages for the specified neighbour
2070 * pending, and if so, consider batching and encrypting them (and
2071 * then trigger processing of the encrypted queue if needed).
2073 * @param n neighbour to check.
2076 process_plaintext_neighbour_queue (struct Neighbour *n)
2078 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
2080 struct EncryptedMessage *em; /* encrypted message */
2081 struct EncryptedMessage *ph; /* plaintext header */
2082 struct MessageEntry *me;
2083 unsigned int priority;
2084 struct GNUNET_TIME_Absolute deadline;
2085 struct GNUNET_TIME_Relative retry_time;
2086 struct GNUNET_CRYPTO_AesInitializationVector iv;
2087 struct GNUNET_CRYPTO_AuthKey auth_key;
2089 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
2091 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
2092 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2096 case PEER_STATE_DOWN:
2099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2100 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2101 GNUNET_i2s(&n->peer));
2104 case PEER_STATE_KEY_SENT:
2105 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2106 n->retry_set_key_task
2107 = GNUNET_SCHEDULER_add_delayed (sched,
2108 n->set_key_retry_frequency,
2109 &set_key_retry_task, n);
2111 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2112 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2113 GNUNET_i2s(&n->peer));
2116 case PEER_STATE_KEY_RECEIVED:
2117 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2118 n->retry_set_key_task
2119 = GNUNET_SCHEDULER_add_delayed (sched,
2120 n->set_key_retry_frequency,
2121 &set_key_retry_task, n);
2123 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2124 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2125 GNUNET_i2s(&n->peer));
2128 case PEER_STATE_KEY_CONFIRMED:
2129 /* ready to continue */
2132 discard_expired_messages (n);
2133 if (n->messages == NULL)
2136 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2137 "Plaintext message queue for `%4s' is empty.\n",
2138 GNUNET_i2s(&n->peer));
2140 return; /* no pending messages */
2142 if (n->encrypted_head != NULL)
2145 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2146 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2147 GNUNET_i2s(&n->peer));
2149 return; /* wait for messages already encrypted to be
2152 ph = (struct EncryptedMessage *) pbuf;
2153 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2155 used = sizeof (struct EncryptedMessage);
2156 used += batch_message (n,
2158 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2159 &deadline, &retry_time, &priority);
2160 if (used == sizeof (struct EncryptedMessage))
2163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2164 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2165 GNUNET_i2s(&n->peer));
2167 /* no messages selected for sending, try again later... */
2168 n->retry_plaintext_task =
2169 GNUNET_SCHEDULER_add_delayed (sched,
2171 &retry_plaintext_processing, n);
2174 #if DEBUG_CORE_QUOTA
2175 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2176 "Sending %u b/s as new limit to peer `%4s'\n",
2177 (unsigned int) ntohl (n->bw_in.value__),
2178 GNUNET_i2s (&n->peer));
2180 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
2181 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2182 ph->inbound_bw_limit = n->bw_in;
2183 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2185 /* setup encryption message header */
2186 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2187 me->deadline = deadline;
2188 me->priority = priority;
2190 em = (struct EncryptedMessage *) &me[1];
2191 em->header.size = htons (used);
2192 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2193 em->iv_seed = ph->iv_seed;
2194 derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
2197 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2198 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2199 (unsigned int) used - ENCRYPTED_HEADER_SIZE,
2200 GNUNET_i2s(&n->peer),
2201 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).value);
2203 GNUNET_assert (GNUNET_OK ==
2206 &ph->sequence_number,
2207 &em->sequence_number, used - ENCRYPTED_HEADER_SIZE));
2208 derive_auth_key (&auth_key,
2211 n->encrypt_key_created);
2212 GNUNET_CRYPTO_hmac (&auth_key,
2213 &em->sequence_number,
2214 used - ENCRYPTED_HEADER_SIZE,
2217 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2218 "Authenticated %u bytes of ciphertext %u: `%s'\n",
2219 used - ENCRYPTED_HEADER_SIZE,
2220 GNUNET_CRYPTO_crc32_n (&em->sequence_number,
2221 used - ENCRYPTED_HEADER_SIZE),
2222 GNUNET_h2s (&em->hmac));
2224 /* append to transmission list */
2225 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2229 process_encrypted_neighbour_queue (n);
2234 * Function that recalculates the bandwidth quota for the
2235 * given neighbour and transmits it to the transport service.
2237 * @param cls neighbour for the quota update
2241 neighbour_quota_update (void *cls,
2242 const struct GNUNET_SCHEDULER_TaskContext *tc);
2246 * Schedule the task that will recalculate the bandwidth
2247 * quota for this peer (and possibly force a disconnect of
2248 * idle peers by calculating a bandwidth of zero).
2251 schedule_quota_update (struct Neighbour *n)
2253 GNUNET_assert (n->quota_update_task ==
2254 GNUNET_SCHEDULER_NO_TASK);
2255 n->quota_update_task
2256 = GNUNET_SCHEDULER_add_delayed (sched,
2257 QUOTA_UPDATE_FREQUENCY,
2258 &neighbour_quota_update,
2264 * Initialize a new 'struct Neighbour'.
2266 * @param pid ID of the new neighbour
2267 * @return handle for the new neighbour
2269 static struct Neighbour *
2270 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2272 struct Neighbour *n;
2273 struct GNUNET_TIME_Absolute now;
2276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2277 "Creating neighbour entry for peer `%4s'\n",
2280 n = GNUNET_malloc (sizeof (struct Neighbour));
2281 n->next = neighbours;
2284 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
2286 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2287 now = GNUNET_TIME_absolute_get ();
2288 n->encrypt_key_created = now;
2289 n->last_activity = now;
2290 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2291 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2292 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2293 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2294 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2295 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
2297 neighbour_quota_update (n, NULL);
2298 consider_free_neighbour (n);
2304 * Handle CORE_SEND request.
2307 * @param client the client issuing the request
2308 * @param message the "struct SendMessage"
2311 handle_client_send (void *cls,
2312 struct GNUNET_SERVER_Client *client,
2313 const struct GNUNET_MessageHeader *message)
2315 const struct SendMessage *sm;
2316 struct Neighbour *n;
2317 struct MessageEntry *prev;
2318 struct MessageEntry *pos;
2319 struct MessageEntry *e;
2320 struct MessageEntry *min_prio_entry;
2321 struct MessageEntry *min_prio_prev;
2322 unsigned int min_prio;
2323 unsigned int queue_size;
2326 msize = ntohs (message->size);
2328 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2330 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));
2333 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2336 sm = (const struct SendMessage *) message;
2337 msize -= sizeof (struct SendMessage);
2338 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2340 /* FIXME: should we not allow loopback-injection here? */
2343 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2346 n = find_neighbour (&sm->peer);
2348 n = create_neighbour (&sm->peer);
2350 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2351 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2353 (unsigned int) msize,
2354 GNUNET_i2s (&sm->peer));
2356 /* bound queue size */
2357 discard_expired_messages (n);
2358 min_prio = UINT32_MAX;
2359 min_prio_entry = NULL;
2360 min_prio_prev = NULL;
2366 if (pos->priority <= min_prio)
2368 min_prio_entry = pos;
2369 min_prio_prev = prev;
2370 min_prio = pos->priority;
2376 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2379 if (ntohl(sm->priority) <= min_prio)
2381 /* discard new entry */
2383 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2384 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2386 (unsigned int) MAX_PEER_QUEUE_SIZE,
2387 (unsigned int) msize,
2388 (unsigned int) ntohs (message->type));
2391 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2394 GNUNET_assert (min_prio_entry != NULL);
2395 /* discard "min_prio_entry" */
2397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2398 "Queue full, discarding existing older request\n");
2400 if (min_prio_prev == NULL)
2401 n->messages = min_prio_entry->next;
2403 min_prio_prev->next = min_prio_entry->next;
2404 GNUNET_free (min_prio_entry);
2408 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2409 "Adding transmission request for `%4s' of size %u to queue\n",
2410 GNUNET_i2s (&sm->peer),
2411 (unsigned int) msize);
2413 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2414 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2415 e->priority = ntohl (sm->priority);
2417 memcpy (&e[1], &sm[1], msize);
2419 /* insert, keep list sorted by deadline */
2422 while ((pos != NULL) && (pos->deadline.value < e->deadline.value))
2433 /* consider scheduling now */
2434 process_plaintext_neighbour_queue (n);
2436 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2441 * Function called when the transport service is ready to
2442 * receive a message. Only resets 'n->th' to NULL.
2444 * @param cls neighbour to use message from
2445 * @param size number of bytes we can transmit
2446 * @param buf where to copy the message
2447 * @return number of bytes transmitted
2450 notify_transport_connect_done (void *cls, size_t size, void *buf)
2452 struct Neighbour *n = cls;
2454 if (GNUNET_YES != n->is_connected)
2456 /* transport should only call us to transmit a message after
2457 * telling us about a successful connection to the respective peer */
2458 n->th = NULL; /* If this happens because of a timeout, reset n-th so another message may be sent for this peer! */
2460 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Timeout on notify connect!\n");
2467 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2468 _("Failed to connect to `%4s': transport failed to connect\n"),
2469 GNUNET_i2s (&n->peer));
2472 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2473 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2474 GNUNET_i2s (&n->peer));
2475 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2476 GNUNET_SCHEDULER_cancel (sched,
2477 n->retry_set_key_task);
2478 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (sched,
2479 &set_key_retry_task,
2486 * Handle CORE_REQUEST_CONNECT request.
2489 * @param client the client issuing the request
2490 * @param message the "struct ConnectMessage"
2493 handle_client_request_connect (void *cls,
2494 struct GNUNET_SERVER_Client *client,
2495 const struct GNUNET_MessageHeader *message)
2497 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2498 struct Neighbour *n;
2499 struct GNUNET_TIME_Relative timeout;
2501 if (0 == memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2504 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2507 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2508 n = find_neighbour (&cm->peer);
2510 n = create_neighbour (&cm->peer);
2511 if ( (GNUNET_YES == n->is_connected) ||
2514 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2515 "Core received `%s' request for `%4s', already connected!\n",
2517 GNUNET_i2s (&cm->peer));
2518 return; /* already connected, or at least trying */
2520 GNUNET_STATISTICS_update (stats, gettext_noop ("# connection requests received"), 1, GNUNET_NO);
2522 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2523 "Core received `%s' request for `%4s', will try to establish connection\n",
2525 GNUNET_i2s (&cm->peer));
2527 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2528 /* ask transport to connect to the peer */
2529 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2531 sizeof (struct GNUNET_MessageHeader), 0,
2533 ¬ify_transport_connect_done,
2535 GNUNET_break (NULL != n->th);
2540 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2541 * the neighbour's struct and retry send_key. Or, if we did not get a
2542 * HELLO, just do nothing.
2544 * @param cls the 'struct Neighbour' to retry sending the key for
2545 * @param peer the peer for which this is the HELLO
2546 * @param hello HELLO message of that peer
2549 process_hello_retry_send_key (void *cls,
2550 const struct GNUNET_PeerIdentity *peer,
2551 const struct GNUNET_HELLO_Message *hello)
2553 struct Neighbour *n = cls;
2558 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2559 "Entered `%s' and `%s' is NULL!\n",
2560 "process_hello_retry_send_key",
2564 if (n->public_key != NULL)
2566 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2568 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2569 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2571 GNUNET_STATISTICS_update (stats,
2572 gettext_noop ("# SET_KEY messages deferred (need public key)"),
2580 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2581 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
2582 GNUNET_i2s (&n->peer));
2584 GNUNET_STATISTICS_update (stats,
2585 gettext_noop ("# Delayed connecting due to lack of public key"),
2588 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2589 n->retry_set_key_task
2590 = GNUNET_SCHEDULER_add_delayed (sched,
2591 n->set_key_retry_frequency,
2592 &set_key_retry_task, n);
2598 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2599 "Entered `%s' for peer `%4s'\n",
2600 "process_hello_retry_send_key",
2603 if (n->public_key != NULL)
2605 /* already have public key, why are we here? */
2611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2612 "Received new `%s' message for `%4s', initiating key exchange.\n",
2617 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2618 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2620 GNUNET_STATISTICS_update (stats,
2621 gettext_noop ("# Error extracting public key from HELLO"),
2624 GNUNET_free (n->public_key);
2625 n->public_key = NULL;
2627 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2628 "GNUNET_HELLO_get_key returned awfully\n");
2636 * Send our key (and encrypted PING) to the other peer.
2638 * @param n the other peer
2641 send_key (struct Neighbour *n)
2643 struct MessageEntry *pos;
2644 struct SetKeyMessage *sm;
2645 struct MessageEntry *me;
2646 struct PingMessage pp;
2647 struct PingMessage *pm;
2648 struct GNUNET_CRYPTO_AesInitializationVector iv;
2650 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2652 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2653 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2655 if (n->pitr != NULL)
2658 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2659 "Key exchange in progress with `%4s'.\n",
2660 GNUNET_i2s (&n->peer));
2662 return; /* already in progress */
2664 if (GNUNET_YES != n->is_connected)
2667 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2668 "Not yet connected to peer `%4s'!\n",
2669 GNUNET_i2s (&n->peer));
2673 GNUNET_STATISTICS_update (stats,
2674 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
2677 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2679 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
2681 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2682 ¬ify_encrypted_transmit_ready,
2688 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2689 "Asked to perform key exchange with `%4s'.\n",
2690 GNUNET_i2s (&n->peer));
2692 if (n->public_key == NULL)
2694 /* lookup n's public key, then try again */
2696 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2697 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2698 GNUNET_i2s (&n->peer));
2700 GNUNET_assert (n->pitr == NULL);
2701 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
2703 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2704 &process_hello_retry_send_key, n);
2707 pos = n->encrypted_head;
2710 if (GNUNET_YES == pos->is_setkey)
2712 if (pos->sender_status == n->status)
2715 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2716 "`%s' message for `%4s' queued already\n",
2718 GNUNET_i2s (&n->peer));
2720 goto trigger_processing;
2722 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
2727 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2728 "Removing queued `%s' message for `%4s', will create a new one\n",
2730 GNUNET_i2s (&n->peer));
2740 case PEER_STATE_DOWN:
2741 n->status = PEER_STATE_KEY_SENT;
2743 case PEER_STATE_KEY_SENT:
2745 case PEER_STATE_KEY_RECEIVED:
2747 case PEER_STATE_KEY_CONFIRMED:
2755 /* first, set key message */
2756 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2757 sizeof (struct SetKeyMessage) +
2758 sizeof (struct PingMessage));
2759 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
2760 me->priority = SET_KEY_PRIORITY;
2761 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
2762 me->is_setkey = GNUNET_YES;
2763 me->got_slack = GNUNET_YES; /* do not defer this one! */
2764 me->sender_status = n->status;
2765 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2769 sm = (struct SetKeyMessage *) &me[1];
2770 sm->header.size = htons (sizeof (struct SetKeyMessage));
2771 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
2772 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
2773 PEER_STATE_KEY_SENT : n->status));
2775 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2776 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2777 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2778 sizeof (struct GNUNET_PeerIdentity));
2779 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
2780 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
2781 sm->target = n->peer;
2782 GNUNET_assert (GNUNET_OK ==
2783 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
2785 GNUNET_CRYPTO_AesSessionKey),
2787 &sm->encrypted_key));
2788 GNUNET_assert (GNUNET_OK ==
2789 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
2791 pm = (struct PingMessage *) &sm[1];
2792 pm->header.size = htons (sizeof (struct PingMessage));
2793 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
2794 pm->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
2795 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
2796 pp.challenge = n->ping_challenge;
2797 pp.target = n->peer;
2799 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2800 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
2802 (unsigned int) n->ping_challenge,
2803 GNUNET_i2s (&n->peer),
2804 (unsigned int) n->encrypt_key.crc32,
2805 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
2812 sizeof (struct PingMessage) -
2813 ((void *) &pm->target - (void *) pm));
2814 GNUNET_STATISTICS_update (stats,
2815 gettext_noop ("# SET_KEY and PING messages created"),
2819 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2820 "Have %llu ms left for `%s' transmission.\n",
2821 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).value,
2825 /* trigger queue processing */
2826 process_encrypted_neighbour_queue (n);
2827 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
2828 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
2829 n->retry_set_key_task
2830 = GNUNET_SCHEDULER_add_delayed (sched,
2831 n->set_key_retry_frequency,
2832 &set_key_retry_task, n);
2837 * We received a SET_KEY message. Validate and update
2838 * our key material and status.
2840 * @param n the neighbour from which we received message m
2841 * @param m the set key message we received
2844 handle_set_key (struct Neighbour *n,
2845 const struct SetKeyMessage *m);
2849 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2850 * the neighbour's struct and retry handling the set_key message. Or,
2851 * if we did not get a HELLO, just free the set key message.
2853 * @param cls pointer to the set key message
2854 * @param peer the peer for which this is the HELLO
2855 * @param hello HELLO message of that peer
2858 process_hello_retry_handle_set_key (void *cls,
2859 const struct GNUNET_PeerIdentity *peer,
2860 const struct GNUNET_HELLO_Message *hello)
2862 struct Neighbour *n = cls;
2863 struct SetKeyMessage *sm = n->skm;
2869 if (n->public_key != NULL)
2872 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2873 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
2875 GNUNET_i2s (&n->peer),
2878 handle_set_key (n, sm);
2882 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2883 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
2885 GNUNET_i2s (&n->peer));
2890 if (n->public_key != NULL)
2891 return; /* multiple HELLOs match!? */
2893 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2894 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2896 GNUNET_break_op (0);
2897 GNUNET_free (n->public_key);
2898 n->public_key = NULL;
2904 * We received a PING message. Validate and transmit
2907 * @param n sender of the PING
2908 * @param m the encrypted PING message itself
2911 handle_ping (struct Neighbour *n, const struct PingMessage *m)
2913 struct PingMessage t;
2914 struct PongMessage tx;
2915 struct PongMessage *tp;
2916 struct MessageEntry *me;
2917 struct GNUNET_CRYPTO_AesInitializationVector iv;
2920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2921 "Core service receives `%s' request from `%4s'.\n",
2922 "PING", GNUNET_i2s (&n->peer));
2924 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
2930 sizeof (struct PingMessage) -
2931 ((void *) &m->target - (void *) m)))
2934 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2935 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
2937 GNUNET_i2s (&t.target),
2938 (unsigned int) t.challenge,
2939 (unsigned int) n->decrypt_key.crc32,
2940 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
2943 GNUNET_STATISTICS_update (stats,
2944 gettext_noop ("# PING messages decrypted"),
2947 if (0 != memcmp (&t.target,
2948 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2950 GNUNET_break_op (0);
2953 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2954 sizeof (struct PongMessage));
2955 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2959 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
2960 me->priority = PONG_PRIORITY;
2961 me->size = sizeof (struct PongMessage);
2962 tx.inbound_bw_limit = n->bw_in;
2963 tx.challenge = t.challenge;
2964 tx.target = t.target;
2965 tp = (struct PongMessage *) &me[1];
2966 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
2967 tp->header.size = htons (sizeof (struct PongMessage));
2968 tp->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
2969 derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
2974 sizeof (struct PongMessage) -
2975 ((void *) &tp->challenge - (void *) tp));
2976 GNUNET_STATISTICS_update (stats,
2977 gettext_noop ("# PONG messages created"),
2981 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2982 "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
2984 (unsigned int) t.challenge,
2985 (unsigned int) n->encrypt_key.crc32,
2986 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
2989 /* trigger queue processing */
2990 process_encrypted_neighbour_queue (n);
2995 * We received a PONG message. Validate and update our status.
2997 * @param n sender of the PONG
2998 * @param m the encrypted PONG message itself
3001 handle_pong (struct Neighbour *n,
3002 const struct PongMessage *m)
3004 struct PongMessage t;
3005 struct ConnectNotifyMessage cnm;
3006 struct GNUNET_CRYPTO_AesInitializationVector iv;
3009 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3010 "Core service receives `%s' response from `%4s'.\n",
3011 "PONG", GNUNET_i2s (&n->peer));
3013 /* mark as garbage, just to be sure */
3014 memset (&t, 255, sizeof (t));
3015 derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
3022 sizeof (struct PongMessage) -
3023 ((void *) &m->challenge - (void *) m)))
3025 GNUNET_break_op (0);
3028 GNUNET_STATISTICS_update (stats,
3029 gettext_noop ("# PONG messages decrypted"),
3033 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3034 "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
3036 GNUNET_i2s (&t.target),
3037 (unsigned int) t.challenge,
3038 (unsigned int) n->decrypt_key.crc32,
3039 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3042 if ((0 != memcmp (&t.target,
3044 sizeof (struct GNUNET_PeerIdentity))) ||
3045 (n->ping_challenge != t.challenge))
3047 /* PONG malformed */
3049 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3050 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
3052 GNUNET_i2s (&n->peer),
3053 (unsigned int) n->ping_challenge);
3054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3055 "Received malformed `%s' received from `%4s' with challenge %u\n",
3056 "PONG", GNUNET_i2s (&t.target),
3057 (unsigned int) t.challenge);
3059 GNUNET_break_op (0);
3064 case PEER_STATE_DOWN:
3065 GNUNET_break (0); /* should be impossible */
3067 case PEER_STATE_KEY_SENT:
3068 GNUNET_break (0); /* should be impossible, how did we decrypt? */
3070 case PEER_STATE_KEY_RECEIVED:
3071 GNUNET_STATISTICS_update (stats,
3072 gettext_noop ("# Session keys confirmed via PONG"),
3075 n->status = PEER_STATE_KEY_CONFIRMED;
3076 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
3078 n->bw_out_external_limit = t.inbound_bw_limit;
3079 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3080 n->bw_out_internal_limit);
3081 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3083 GNUNET_TRANSPORT_set_quota (transport,
3087 GNUNET_TIME_UNIT_FOREVER_REL,
3091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3092 "Confirmed key via `%s' message for peer `%4s'\n",
3093 "PONG", GNUNET_i2s (&n->peer));
3095 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3097 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
3098 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3100 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
3101 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
3102 cnm.distance = htonl (n->last_distance);
3103 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
3105 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
3106 process_encrypted_neighbour_queue (n);
3108 case PEER_STATE_KEY_CONFIRMED:
3109 n->last_activity = GNUNET_TIME_absolute_get ();
3110 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3111 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3113 = GNUNET_SCHEDULER_add_delayed (sched,
3114 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3117 handle_peer_status_change (n);
3127 * We received a SET_KEY message. Validate and update
3128 * our key material and status.
3130 * @param n the neighbour from which we received message m
3131 * @param m the set key message we received
3134 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
3136 struct SetKeyMessage *m_cpy;
3137 struct GNUNET_TIME_Absolute t;
3138 struct GNUNET_CRYPTO_AesSessionKey k;
3139 struct PingMessage *ping;
3140 struct PongMessage *pong;
3141 enum PeerStateMachine sender_status;
3144 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3145 "Core service receives `%s' request from `%4s'.\n",
3146 "SET_KEY", GNUNET_i2s (&n->peer));
3148 if (n->public_key == NULL)
3150 if (n->pitr != NULL)
3153 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3154 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3160 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3161 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3163 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3164 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3165 /* lookup n's public key, then try again */
3166 GNUNET_assert (n->skm == NULL);
3168 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3170 GNUNET_TIME_UNIT_MINUTES,
3171 &process_hello_retry_handle_set_key, n);
3172 GNUNET_STATISTICS_update (stats,
3173 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3178 if (0 != memcmp (&m->target,
3180 sizeof (struct GNUNET_PeerIdentity)))
3182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3183 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3185 GNUNET_i2s (&m->target));
3188 if ((ntohl (m->purpose.size) !=
3189 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3190 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3191 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3192 sizeof (struct GNUNET_PeerIdentity)) ||
3194 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3195 &m->purpose, &m->signature, n->public_key)))
3197 /* invalid signature */
3198 GNUNET_break_op (0);
3201 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3202 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3203 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3204 (t.value < n->decrypt_key_created.value))
3206 /* this could rarely happen due to massive re-ordering of
3207 messages on the network level, but is most likely either
3208 a bug or some adversary messing with us. Report. */
3209 GNUNET_break_op (0);
3213 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3214 "Decrypting key material.\n");
3216 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3219 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3220 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3221 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3223 /* failed to decrypt !? */
3224 GNUNET_break_op (0);
3227 GNUNET_STATISTICS_update (stats,
3228 gettext_noop ("# SET_KEY messages decrypted"),
3232 if (n->decrypt_key_created.value != t.value)
3234 /* fresh key, reset sequence numbers */
3235 n->last_sequence_number_received = 0;
3236 n->last_packets_bitmap = 0;
3237 n->decrypt_key_created = t;
3239 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3242 case PEER_STATE_DOWN:
3243 n->status = PEER_STATE_KEY_RECEIVED;
3245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3246 "Responding to `%s' with my own key.\n", "SET_KEY");
3250 case PEER_STATE_KEY_SENT:
3251 case PEER_STATE_KEY_RECEIVED:
3252 n->status = PEER_STATE_KEY_RECEIVED;
3253 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3254 (sender_status != PEER_STATE_KEY_CONFIRMED))
3257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3258 "Responding to `%s' with my own key (other peer has status %u).\n",
3260 (unsigned int) sender_status);
3265 case PEER_STATE_KEY_CONFIRMED:
3266 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3267 (sender_status != PEER_STATE_KEY_CONFIRMED))
3270 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3271 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3273 (unsigned int) sender_status);
3282 if (n->pending_ping != NULL)
3284 ping = n->pending_ping;
3285 n->pending_ping = NULL;
3286 handle_ping (n, ping);
3289 if (n->pending_pong != NULL)
3291 pong = n->pending_pong;
3292 n->pending_pong = NULL;
3293 handle_pong (n, pong);
3300 * Send a P2P message to a client.
3302 * @param sender who sent us the message?
3303 * @param client who should we give the message to?
3304 * @param m contains the message to transmit
3305 * @param msize number of bytes in buf to transmit
3308 send_p2p_message_to_client (struct Neighbour *sender,
3309 struct Client *client,
3310 const void *m, size_t msize)
3312 char buf[msize + sizeof (struct NotifyTrafficMessage)];
3313 struct NotifyTrafficMessage *ntm;
3316 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3317 "Core service passes message from `%4s' of type %u to client.\n",
3318 GNUNET_i2s(&sender->peer),
3319 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3321 ntm = (struct NotifyTrafficMessage *) buf;
3322 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
3323 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3324 ntm->distance = htonl (sender->last_distance);
3325 ntm->latency = GNUNET_TIME_relative_hton (sender->last_latency);
3326 ntm->peer = sender->peer;
3327 memcpy (&ntm[1], m, msize);
3328 send_to_client (client, &ntm->header, GNUNET_YES);
3333 * Deliver P2P message to interested clients.
3335 * @param cls always NULL
3336 * @param client who sent us the message (struct Neighbour)
3337 * @param m the message
3340 deliver_message (void *cls,
3342 const struct GNUNET_MessageHeader *m)
3344 struct Neighbour *sender = client;
3345 size_t msize = ntohs (m->size);
3347 struct Client *cpos;
3353 type = ntohs (m->type);
3355 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3356 "Received encapsulated message of type %u and size %u from `%4s'\n",
3357 (unsigned int) type,
3359 GNUNET_i2s (&sender->peer));
3361 GNUNET_snprintf (buf,
3363 gettext_noop ("# bytes of messages of type %u received"),
3364 (unsigned int) type);
3365 GNUNET_STATISTICS_set (stats,
3369 dropped = GNUNET_YES;
3371 while (cpos != NULL)
3373 deliver_full = GNUNET_NO;
3374 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
3375 deliver_full = GNUNET_YES;
3378 for (tpos = 0; tpos < cpos->tcnt; tpos++)
3380 if (type != cpos->types[tpos])
3382 deliver_full = GNUNET_YES;
3386 if (GNUNET_YES == deliver_full)
3388 send_p2p_message_to_client (sender, cpos, m, msize);
3389 dropped = GNUNET_NO;
3391 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
3393 send_p2p_message_to_client (sender, cpos, m,
3394 sizeof (struct GNUNET_MessageHeader));
3398 if (dropped == GNUNET_YES)
3401 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3402 "Message of type %u from `%4s' not delivered to any client.\n",
3403 (unsigned int) type,
3404 GNUNET_i2s (&sender->peer));
3406 GNUNET_STATISTICS_update (stats,
3407 gettext_noop ("# messages not delivered to any client"),
3414 * We received an encrypted message. Decrypt, validate and
3415 * pass on to the appropriate clients.
3418 handle_encrypted_message (struct Neighbour *n,
3419 const struct EncryptedMessage *m)
3421 size_t size = ntohs (m->header.size);
3423 struct EncryptedMessage *pt; /* plaintext */
3426 struct GNUNET_TIME_Absolute t;
3427 struct GNUNET_CRYPTO_AesInitializationVector iv;
3428 struct GNUNET_CRYPTO_AuthKey auth_key;
3431 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3432 "Core service receives `%s' request from `%4s'.\n",
3433 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
3436 derive_auth_key (&auth_key,
3439 n->decrypt_key_created);
3440 GNUNET_CRYPTO_hmac (&auth_key,
3441 &m->sequence_number,
3442 size - ENCRYPTED_HEADER_SIZE, &ph);
3444 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3445 "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
3446 (unsigned int) size - ENCRYPTED_HEADER_SIZE,
3447 GNUNET_CRYPTO_crc32_n (&m->sequence_number,
3448 size - ENCRYPTED_HEADER_SIZE),
3452 if (0 != memcmp (&ph,
3454 sizeof (GNUNET_HashCode)))
3456 /* checksum failed */
3457 GNUNET_break_op (0);
3460 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3465 &m->sequence_number,
3466 &buf[ENCRYPTED_HEADER_SIZE],
3467 size - ENCRYPTED_HEADER_SIZE))
3469 pt = (struct EncryptedMessage *) buf;
3471 /* validate sequence number */
3472 snum = ntohl (pt->sequence_number);
3473 if (n->last_sequence_number_received == snum)
3475 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3476 "Received duplicate message, ignoring.\n");
3477 /* duplicate, ignore */
3478 GNUNET_STATISTICS_set (stats,
3479 gettext_noop ("# bytes dropped (duplicates)"),
3484 if ((n->last_sequence_number_received > snum) &&
3485 (n->last_sequence_number_received - snum > 32))
3487 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3488 "Received ancient out of sequence message, ignoring.\n");
3489 /* ancient out of sequence, ignore */
3490 GNUNET_STATISTICS_set (stats,
3491 gettext_noop ("# bytes dropped (out of sequence)"),
3496 if (n->last_sequence_number_received > snum)
3498 unsigned int rotbit =
3499 1 << (n->last_sequence_number_received - snum - 1);
3500 if ((n->last_packets_bitmap & rotbit) != 0)
3502 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3503 "Received duplicate message, ignoring.\n");
3504 GNUNET_STATISTICS_set (stats,
3505 gettext_noop ("# bytes dropped (duplicates)"),
3508 /* duplicate, ignore */
3511 n->last_packets_bitmap |= rotbit;
3513 if (n->last_sequence_number_received < snum)
3515 n->last_packets_bitmap <<= (snum - n->last_sequence_number_received);
3516 n->last_sequence_number_received = snum;
3519 /* check timestamp */
3520 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
3521 if (GNUNET_TIME_absolute_get_duration (t).value > MAX_MESSAGE_AGE.value)
3523 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3525 ("Message received far too old (%llu ms). Content ignored.\n"),
3526 GNUNET_TIME_absolute_get_duration (t).value);
3527 GNUNET_STATISTICS_set (stats,
3528 gettext_noop ("# bytes dropped (ancient message)"),
3534 /* process decrypted message(s) */
3535 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
3537 #if DEBUG_CORE_SET_QUOTA
3538 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3539 "Received %u b/s as new inbound limit for peer `%4s'\n",
3540 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
3541 GNUNET_i2s (&n->peer));
3543 n->bw_out_external_limit = pt->inbound_bw_limit;
3544 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3545 n->bw_out_internal_limit);
3546 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3548 GNUNET_TRANSPORT_set_quota (transport,
3552 GNUNET_TIME_UNIT_FOREVER_REL,
3555 n->last_activity = GNUNET_TIME_absolute_get ();
3556 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3557 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3559 = GNUNET_SCHEDULER_add_delayed (sched,
3560 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3563 GNUNET_STATISTICS_set (stats,
3564 gettext_noop ("# bytes of payload decrypted"),
3565 size - sizeof (struct EncryptedMessage),
3567 handle_peer_status_change (n);
3568 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
3570 &buf[sizeof (struct EncryptedMessage)],
3571 size - sizeof (struct EncryptedMessage),
3572 GNUNET_YES, GNUNET_NO))
3573 GNUNET_break_op (0);
3578 * Function called by the transport for each received message.
3580 * @param cls closure
3581 * @param peer (claimed) identity of the other peer
3582 * @param message the message
3583 * @param latency estimated latency for communicating with the
3584 * given peer (round-trip)
3585 * @param distance in overlay hops, as given by transport plugin
3588 handle_transport_receive (void *cls,
3589 const struct GNUNET_PeerIdentity *peer,
3590 const struct GNUNET_MessageHeader *message,
3591 struct GNUNET_TIME_Relative latency,
3592 unsigned int distance)
3594 struct Neighbour *n;
3595 struct GNUNET_TIME_Absolute now;
3602 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3603 "Received message of type %u from `%4s', demultiplexing.\n",
3604 (unsigned int) ntohs (message->type),
3607 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3612 n = find_neighbour (peer);
3614 n = create_neighbour (peer);
3615 changed = (latency.value != n->last_latency.value) || (distance != n->last_distance);
3616 n->last_latency = latency;
3617 n->last_distance = distance;
3618 up = (n->status == PEER_STATE_KEY_CONFIRMED);
3619 type = ntohs (message->type);
3620 size = ntohs (message->size);
3623 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
3624 if (size != sizeof (struct SetKeyMessage))
3626 GNUNET_break_op (0);
3629 GNUNET_STATISTICS_update (stats, gettext_noop ("# session keys received"), 1, GNUNET_NO);
3630 handle_set_key (n, (const struct SetKeyMessage *) message);
3632 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3633 if (size < sizeof (struct EncryptedMessage) +
3634 sizeof (struct GNUNET_MessageHeader))
3636 GNUNET_break_op (0);
3639 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3640 (n->status != PEER_STATE_KEY_CONFIRMED))
3642 GNUNET_break_op (0);
3645 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3647 case GNUNET_MESSAGE_TYPE_CORE_PING:
3648 if (size != sizeof (struct PingMessage))
3650 GNUNET_break_op (0);
3653 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
3654 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3655 (n->status != PEER_STATE_KEY_CONFIRMED))
3658 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3659 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3660 "PING", GNUNET_i2s (&n->peer));
3662 GNUNET_free_non_null (n->pending_ping);
3663 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3664 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3667 handle_ping (n, (const struct PingMessage *) message);
3669 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3670 if (size != sizeof (struct PongMessage))
3672 GNUNET_break_op (0);
3675 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
3676 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3677 (n->status != PEER_STATE_KEY_CONFIRMED) )
3680 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3681 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3682 "PONG", GNUNET_i2s (&n->peer));
3684 GNUNET_free_non_null (n->pending_pong);
3685 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
3686 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
3689 handle_pong (n, (const struct PongMessage *) message);
3692 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3693 _("Unsupported message of type %u received.\n"),
3694 (unsigned int) type);
3697 if (n->status == PEER_STATE_KEY_CONFIRMED)
3699 now = GNUNET_TIME_absolute_get ();
3700 n->last_activity = now;
3701 changed = GNUNET_YES;
3704 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), 1, GNUNET_NO);
3705 n->time_established = now;
3707 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3708 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3710 = GNUNET_SCHEDULER_add_delayed (sched,
3711 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3716 handle_peer_status_change (n);
3721 * Function that recalculates the bandwidth quota for the
3722 * given neighbour and transmits it to the transport service.
3724 * @param cls neighbour for the quota update
3728 neighbour_quota_update (void *cls,
3729 const struct GNUNET_SCHEDULER_TaskContext *tc)
3731 struct Neighbour *n = cls;
3732 struct GNUNET_BANDWIDTH_Value32NBO q_in;
3735 unsigned long long distributable;
3736 uint64_t need_per_peer;
3737 uint64_t need_per_second;
3740 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3741 "Neighbour quota update calculation running for peer `%4s'\n",
3742 GNUNET_i2s (&n->peer));
3744 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
3745 /* calculate relative preference among all neighbours;
3746 divides by a bit more to avoid division by zero AND to
3747 account for possibility of new neighbours joining any time
3748 AND to convert to double... */
3749 if (preference_sum == 0)
3751 pref_rel = 1.0 / (double) neighbour_count;
3755 pref_rel = n->current_preference / preference_sum;
3757 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
3758 GNUNET_TIME_UNIT_SECONDS);
3759 need_per_second = need_per_peer * neighbour_count;
3761 if (bandwidth_target_out_bps > need_per_second)
3762 distributable = bandwidth_target_out_bps - need_per_second;
3763 share = distributable * pref_rel;
3764 if (share + need_per_peer > UINT32_MAX)
3765 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
3767 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
3768 /* check if we want to disconnect for good due to inactivity */
3769 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) &&
3770 (GNUNET_TIME_absolute_get_duration (n->time_established).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) )
3773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3774 "Forcing disconnect of `%4s' due to inactivity\n",
3775 GNUNET_i2s (&n->peer));
3777 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
3779 #if DEBUG_CORE_QUOTA
3780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3781 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
3782 GNUNET_i2s (&n->peer),
3783 (unsigned int) ntohl (q_in.value__),
3784 bandwidth_target_out_bps,
3785 (unsigned int) ntohl (n->bw_in.value__),
3786 (unsigned int) ntohl (n->bw_out.value__),
3787 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
3789 if (n->bw_in.value__ != q_in.value__)
3792 if (GNUNET_YES == n->is_connected)
3793 GNUNET_TRANSPORT_set_quota (transport,
3797 GNUNET_TIME_UNIT_FOREVER_REL,
3799 handle_peer_status_change (n);
3801 schedule_quota_update (n);
3806 * Function called by transport to notify us that
3807 * a peer connected to us (on the network level).
3809 * @param cls closure
3810 * @param peer the peer that connected
3811 * @param latency current latency of the connection
3812 * @param distance in overlay hops, as given by transport plugin
3815 handle_transport_notify_connect (void *cls,
3816 const struct GNUNET_PeerIdentity *peer,
3817 struct GNUNET_TIME_Relative latency,
3818 unsigned int distance)
3820 struct Neighbour *n;
3822 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3827 n = find_neighbour (peer);
3830 if (GNUNET_YES == n->is_connected)
3832 /* duplicate connect notification!? */
3839 n = create_neighbour (peer);
3841 GNUNET_STATISTICS_update (stats,
3842 gettext_noop ("# peers connected (transport)"),
3845 n->is_connected = GNUNET_YES;
3846 n->last_latency = latency;
3847 n->last_distance = distance;
3848 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
3851 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
3855 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3856 "Received connection from `%4s'.\n",
3857 GNUNET_i2s (&n->peer));
3859 GNUNET_TRANSPORT_set_quota (transport,
3863 GNUNET_TIME_UNIT_FOREVER_REL,
3870 * Function called by transport telling us that a peer
3873 * @param cls closure
3874 * @param peer the peer that disconnected
3877 handle_transport_notify_disconnect (void *cls,
3878 const struct GNUNET_PeerIdentity *peer)
3880 struct DisconnectNotifyMessage cnm;
3881 struct Neighbour *n;
3882 struct GNUNET_TIME_Relative left;
3885 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3886 "Peer `%4s' disconnected from us; received notification from transport.\n", GNUNET_i2s (peer));
3889 n = find_neighbour (peer);
3895 GNUNET_break (n->is_connected);
3896 if (n->status == PEER_STATE_KEY_CONFIRMED)
3898 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
3899 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
3901 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
3903 n->is_connected = GNUNET_NO;
3904 GNUNET_STATISTICS_update (stats,
3905 gettext_noop ("# peers connected (transport)"),
3908 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
3909 GNUNET_SCHEDULER_cancel (sched,
3910 n->dead_clean_task);
3911 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3912 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
3913 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
3915 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
3916 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
3917 &consider_free_task,
3923 * Last task run during shutdown. Disconnects us from
3927 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3929 struct Neighbour *n;
3933 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3934 "Core service shutting down.\n");
3936 GNUNET_assert (transport != NULL);
3937 GNUNET_TRANSPORT_disconnect (transport);
3939 while (NULL != (n = neighbours))
3941 neighbours = n->next;
3942 GNUNET_assert (neighbour_count > 0);
3946 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
3947 GNUNET_SERVER_notification_context_destroy (notifier);
3949 while (NULL != (c = clients))
3950 handle_client_disconnect (NULL, c->client_handle);
3951 if (my_private_key != NULL)
3952 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3954 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3955 if (peerinfo != NULL)
3956 GNUNET_PEERINFO_disconnect (peerinfo);
3958 GNUNET_SERVER_mst_destroy (mst);
3963 * Initiate core service.
3965 * @param cls closure
3966 * @param s scheduler to use
3967 * @param server the initialized server
3968 * @param c configuration to use
3972 struct GNUNET_SCHEDULER_Handle *s,
3973 struct GNUNET_SERVER_Handle *server,
3974 const struct GNUNET_CONFIGURATION_Handle *c)
3976 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
3977 {&handle_client_init, NULL,
3978 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
3979 {&handle_client_request_info, NULL,
3980 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
3981 sizeof (struct RequestInfoMessage)},
3982 {&handle_client_iterate_peers, NULL,
3983 GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS,
3984 sizeof (struct GNUNET_MessageHeader)},
3985 {&handle_client_send, NULL,
3986 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
3987 {&handle_client_request_connect, NULL,
3988 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
3989 sizeof (struct ConnectMessage)},
3996 /* parse configuration */
3999 GNUNET_CONFIGURATION_get_value_number (c,
4002 &bandwidth_target_in_bps)) ||
4004 GNUNET_CONFIGURATION_get_value_number (c,
4007 &bandwidth_target_out_bps)) ||
4009 GNUNET_CONFIGURATION_get_value_filename (c,
4011 "HOSTKEY", &keyfile)))
4013 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4015 ("Core service is lacking key configuration settings. Exiting.\n"));
4016 GNUNET_SCHEDULER_shutdown (s);
4019 peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
4020 if (NULL == peerinfo)
4022 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4023 _("Could not access PEERINFO service. Exiting.\n"));
4024 GNUNET_SCHEDULER_shutdown (s);
4025 GNUNET_free (keyfile);
4028 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4029 GNUNET_free (keyfile);
4030 if (my_private_key == NULL)
4032 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4033 _("Core service could not access hostkey. Exiting.\n"));
4034 GNUNET_PEERINFO_disconnect (peerinfo);
4035 GNUNET_SCHEDULER_shutdown (s);
4038 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4039 GNUNET_CRYPTO_hash (&my_public_key,
4040 sizeof (my_public_key), &my_identity.hashPubKey);
4041 /* setup notification */
4042 notifier = GNUNET_SERVER_notification_context_create (server,
4044 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
4045 /* setup transport connection */
4046 transport = GNUNET_TRANSPORT_connect (sched,
4050 &handle_transport_receive,
4051 &handle_transport_notify_connect,
4052 &handle_transport_notify_disconnect);
4053 GNUNET_assert (NULL != transport);
4054 stats = GNUNET_STATISTICS_create (sched, "core", cfg);
4055 mst = GNUNET_SERVER_mst_create (&deliver_message,
4057 GNUNET_SCHEDULER_add_delayed (sched,
4058 GNUNET_TIME_UNIT_FOREVER_REL,
4059 &cleaning_task, NULL);
4060 /* process client requests */
4061 GNUNET_SERVER_add_handlers (server, handlers);
4062 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4063 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
4069 * The main function for the transport service.
4071 * @param argc number of arguments from the command line
4072 * @param argv command line arguments
4073 * @return 0 ok, 1 on error
4076 main (int argc, char *const *argv)
4078 return (GNUNET_OK ==
4079 GNUNET_SERVICE_run (argc,
4082 GNUNET_SERVICE_OPTION_NONE,
4083 &run, NULL)) ? 0 : 1;
4086 /* end of gnunet-service-core.c */