2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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13 General Public License for more details.
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22 * @file core/gnunet-service-core.c
23 * @brief high-level P2P messaging
24 * @author Christian Grothoff
26 * Considerations for later:
27 * - check that hostkey used by transport (for HELLOs) is the
28 * same as the hostkey that we are using!
29 * - add code to send PINGs if we are about to time-out otherwise
30 * - optimize lookup (many O(n) list traversals
31 * could ideally be changed to O(1) hash map lookups)
34 #include "gnunet_constants.h"
35 #include "gnunet_util_lib.h"
36 #include "gnunet_hello_lib.h"
37 #include "gnunet_peerinfo_service.h"
38 #include "gnunet_protocols.h"
39 #include "gnunet_signatures.h"
40 #include "gnunet_statistics_service.h"
41 #include "gnunet_transport_service.h"
45 #define DEBUG_HANDSHAKE GNUNET_NO
47 #define DEBUG_CORE_QUOTA GNUNET_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
162 * We've sent our session key.
167 * We've received the other peers session key.
169 PEER_STATE_KEY_RECEIVED,
172 * The other peer has confirmed our session key with a message
173 * encrypted with his session key (which we got). Session is now fully up.
175 PEER_STATE_KEY_CONFIRMED
180 * Encapsulation for encrypted messages exchanged between
181 * peers. Followed by the actual encrypted data.
183 struct EncryptedMessage
186 * Message type is either CORE_ENCRYPTED_MESSAGE.
188 struct GNUNET_MessageHeader header;
191 * Random value used for IV generation.
193 uint32_t iv_seed GNUNET_PACKED;
196 * MAC of the encrypted message (starting at 'sequence_number'),
197 * used to verify message integrity. Everything after this value
198 * (excluding this value itself) will be encrypted and authenticated.
199 * ENCRYPTED_HEADER_SIZE must be set to the offset of the *next* field.
201 GNUNET_HashCode hmac;
204 * Sequence number, in network byte order. This field
205 * must be the first encrypted/decrypted field
207 uint32_t sequence_number GNUNET_PACKED;
210 * Desired bandwidth (how much we should send to this peer / how
211 * much is the sender willing to receive)?
213 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
216 * Timestamp. Used to prevent reply of ancient messages
217 * (recent messages are caught with the sequence number).
219 struct GNUNET_TIME_AbsoluteNBO timestamp;
225 * Number of bytes (at the beginning) of "struct EncryptedMessage"
226 * that are NOT encrypted.
228 #define ENCRYPTED_HEADER_SIZE (offsetof(struct EncryptedMessage, sequence_number))
232 * We're sending an (encrypted) PING to the other peer to check if he
233 * can decrypt. The other peer should respond with a PONG with the
234 * same content, except this time encrypted with the receiver's key.
239 * Message type is CORE_PING.
241 struct GNUNET_MessageHeader header;
246 uint32_t iv_seed GNUNET_PACKED;
249 * Intended target of the PING, used primarily to check
250 * that decryption actually worked.
252 struct GNUNET_PeerIdentity target;
255 * Random number chosen to make reply harder.
257 uint32_t challenge GNUNET_PACKED;
263 * Response to a PING. Includes data from the original PING
264 * plus initial bandwidth quota information.
269 * Message type is CORE_PONG.
271 struct GNUNET_MessageHeader header;
276 uint32_t iv_seed GNUNET_PACKED;
279 * Random number to make faking the reply harder. Must be
280 * first field after header (this is where we start to encrypt!).
282 uint32_t challenge GNUNET_PACKED;
285 * Desired bandwidth (how much we should send to this
286 * peer / how much is the sender willing to receive).
288 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
291 * Intended target of the PING, used primarily to check
292 * that decryption actually worked.
294 struct GNUNET_PeerIdentity target;
299 * Message transmitted to set (or update) a session key.
305 * Message type is either CORE_SET_KEY.
307 struct GNUNET_MessageHeader header;
310 * Status of the sender (should be in "enum PeerStateMachine"), nbo.
312 int32_t sender_status GNUNET_PACKED;
315 * Purpose of the signature, will be
316 * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
318 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
321 * At what time was this key created?
323 struct GNUNET_TIME_AbsoluteNBO creation_time;
326 * The encrypted session key.
328 struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
331 * Who is the intended recipient?
333 struct GNUNET_PeerIdentity target;
336 * Signature of the stuff above (starting at purpose).
338 struct GNUNET_CRYPTO_RsaSignature signature;
344 * Message waiting for transmission. This struct
345 * is followed by the actual content of the message.
351 * We keep messages in a doubly linked list.
353 struct MessageEntry *next;
356 * We keep messages in a doubly linked list.
358 struct MessageEntry *prev;
361 * By when are we supposed to transmit this message?
363 struct GNUNET_TIME_Absolute deadline;
366 * By when are we supposed to transmit this message (after
369 struct GNUNET_TIME_Absolute slack_deadline;
372 * How important is this message to us?
374 unsigned int priority;
377 * If this is a SET_KEY message, what was our connection status when this
378 * message was queued?
380 enum PeerStateMachine sender_status;
383 * Is this a SET_KEY message?
388 * How long is the message? (number of bytes following
389 * the "struct MessageEntry", but not including the
390 * size of "struct MessageEntry" itself!)
395 * Was this message selected for transmission in the
396 * current round? GNUNET_YES or GNUNET_NO.
401 * Did we give this message some slack (delayed sending) previously
402 * (and hence should not give it any more slack)? GNUNET_YES or
411 * Record kept for each request for transmission issued by a
412 * client that is still pending.
414 struct ClientActiveRequest;
417 * Data kept per neighbouring peer.
423 * Unencrypted messages destined for this peer.
425 struct MessageEntry *messages;
428 * Head of the batched, encrypted message queue (already ordered,
429 * transmit starting with the head).
431 struct MessageEntry *encrypted_head;
434 * Tail of the batched, encrypted message queue (already ordered,
435 * append new messages to tail)
437 struct MessageEntry *encrypted_tail;
440 * Head of list of requests from clients for transmission to
443 struct ClientActiveRequest *active_client_request_head;
446 * Tail of list of requests from clients for transmission to
449 struct ClientActiveRequest *active_client_request_tail;
452 * Handle for pending requests for transmission to this peer
453 * with the transport service. NULL if no request is pending.
455 struct GNUNET_TRANSPORT_TransmitHandle *th;
458 * Public key of the neighbour, NULL if we don't have it yet.
460 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
463 * We received a PING message before we got the "public_key"
464 * (or the SET_KEY). We keep it here until we have a key
465 * to decrypt it. NULL if no PING is pending.
467 struct PingMessage *pending_ping;
470 * We received a PONG message before we got the "public_key"
471 * (or the SET_KEY). We keep it here until we have a key
472 * to decrypt it. NULL if no PONG is pending.
474 struct PongMessage *pending_pong;
477 * Non-NULL if we are currently looking up HELLOs for this peer.
480 struct GNUNET_PEERINFO_IteratorContext *pitr;
483 * SetKeyMessage to transmit, NULL if we are not currently trying
486 struct SetKeyMessage *skm;
489 * Performance data for the peer.
491 struct GNUNET_TRANSPORT_ATS_Information *ats;
494 * Identity of the neighbour.
496 struct GNUNET_PeerIdentity peer;
499 * Key we use to encrypt our messages for the other peer
500 * (initialized by us when we do the handshake).
502 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
505 * Key we use to decrypt messages from the other peer
506 * (given to us by the other peer during the handshake).
508 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
511 * ID of task used for re-trying plaintext scheduling.
513 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
516 * ID of task used for re-trying SET_KEY and PING message.
518 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
521 * ID of task used for updating bandwidth quota for this neighbour.
523 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
526 * ID of task used for sending keep-alive pings.
528 GNUNET_SCHEDULER_TaskIdentifier keep_alive_task;
531 * ID of task used for cleaning up dead neighbour entries.
533 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
536 * At what time did we generate our encryption key?
538 struct GNUNET_TIME_Absolute encrypt_key_created;
541 * At what time did the other peer generate the decryption key?
543 struct GNUNET_TIME_Absolute decrypt_key_created;
546 * At what time did we initially establish (as in, complete session
547 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
549 struct GNUNET_TIME_Absolute time_established;
552 * At what time did we last receive an encrypted message from the
553 * other peer? Should be zero if status != KEY_CONFIRMED.
555 struct GNUNET_TIME_Absolute last_activity;
558 * At what frequency are we currently re-trying SET_KEY messages?
560 struct GNUNET_TIME_Relative set_key_retry_frequency;
563 * Tracking bandwidth for sending to this peer.
565 struct GNUNET_BANDWIDTH_Tracker available_send_window;
568 * Tracking bandwidth for receiving from this peer.
570 struct GNUNET_BANDWIDTH_Tracker available_recv_window;
573 * How valueable were the messages of this peer recently?
575 unsigned long long current_preference;
578 * Number of entries in 'ats'.
580 unsigned int ats_count;
583 * Bit map indicating which of the 32 sequence numbers before the last
584 * were received (good for accepting out-of-order packets and
585 * estimating reliability of the connection)
587 unsigned int last_packets_bitmap;
590 * last sequence number received on this connection (highest)
592 uint32_t last_sequence_number_received;
595 * last sequence number transmitted
597 uint32_t last_sequence_number_sent;
600 * Available bandwidth in for this peer (current target).
602 struct GNUNET_BANDWIDTH_Value32NBO bw_in;
605 * Available bandwidth out for this peer (current target).
607 struct GNUNET_BANDWIDTH_Value32NBO bw_out;
610 * Internal bandwidth limit set for this peer (initially typically
611 * set to "-1"). Actual "bw_out" is MIN of
612 * "bpm_out_internal_limit" and "bw_out_external_limit".
614 struct GNUNET_BANDWIDTH_Value32NBO bw_out_internal_limit;
617 * External bandwidth limit set for this peer by the
618 * peer that we are communicating with. "bw_out" is MIN of
619 * "bw_out_internal_limit" and "bw_out_external_limit".
621 struct GNUNET_BANDWIDTH_Value32NBO bw_out_external_limit;
624 * What was our PING challenge number (for this peer)?
626 uint32_t ping_challenge;
629 * What is our connection status?
631 enum PeerStateMachine status;
634 * Are we currently connected to this neighbour?
642 * Data structure for each client connected to the core service.
647 * Clients are kept in a linked list.
652 * Handle for the client with the server API.
654 struct GNUNET_SERVER_Client *client_handle;
657 * Array of the types of messages this peer cares
658 * about (with "tcnt" entries). Allocated as part
659 * of this client struct, do not free!
661 const uint16_t *types;
664 * Map of peer identities to active transmission requests of this
665 * client to the peer (of type 'struct ClientActiveRequest').
667 struct GNUNET_CONTAINER_MultiHashMap *requests;
670 * Options for messages this client cares about,
671 * see GNUNET_CORE_OPTION_ values.
676 * Number of types of incoming messages this client
677 * specifically cares about. Size of the "types" array.
685 * Record kept for each request for transmission issued by a
686 * client that is still pending.
688 struct ClientActiveRequest
692 * Active requests are kept in a doubly-linked list of
693 * the respective target peer.
695 struct ClientActiveRequest *next;
698 * Active requests are kept in a doubly-linked list of
699 * the respective target peer.
701 struct ClientActiveRequest *prev;
704 * Handle to the client.
706 struct Client *client;
709 * By what time would the client want to see this message out?
711 struct GNUNET_TIME_Absolute deadline;
714 * How important is this request.
719 * How many more requests does this client have?
724 * How many bytes does the client intend to send?
729 * Unique request ID (in big endian).
740 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
745 static struct GNUNET_PeerIdentity my_identity;
750 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
754 * Handle to peerinfo service.
756 static struct GNUNET_PEERINFO_Handle *peerinfo;
759 * Our message stream tokenizer (for encrypted payload).
761 static struct GNUNET_SERVER_MessageStreamTokenizer *mst;
766 const struct GNUNET_CONFIGURATION_Handle *cfg;
771 static struct GNUNET_TRANSPORT_Handle *transport;
774 * Linked list of our clients.
776 static struct Client *clients;
779 * Context for notifications we need to send to our clients.
781 static struct GNUNET_SERVER_NotificationContext *notifier;
784 * Map of peer identities to 'struct Neighbour'.
786 static struct GNUNET_CONTAINER_MultiHashMap *neighbours;
789 * Neighbour entry for "this" peer.
791 static struct Neighbour self;
794 * For creating statistics.
796 static struct GNUNET_STATISTICS_Handle *stats;
799 * Sum of all preferences among all neighbours.
801 static unsigned long long preference_sum;
804 * How much inbound bandwidth are we supposed to be using per second?
806 static unsigned long long bandwidth_target_in_bps;
809 * How much outbound bandwidth are we supposed to be using per second?
811 static unsigned long long bandwidth_target_out_bps;
814 * Derive an authentication key from "set key" information
817 derive_auth_key (struct GNUNET_CRYPTO_AuthKey *akey,
818 const struct GNUNET_CRYPTO_AesSessionKey *skey,
820 struct GNUNET_TIME_Absolute creation_time)
822 static const char ctx[] = "authentication key";
823 struct GNUNET_TIME_AbsoluteNBO ctbe;
826 ctbe = GNUNET_TIME_absolute_hton (creation_time);
827 GNUNET_CRYPTO_hmac_derive_key (akey,
841 * Derive an IV from packet information
844 derive_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
845 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
846 const struct GNUNET_PeerIdentity *identity)
848 static const char ctx[] = "initialization vector";
850 GNUNET_CRYPTO_aes_derive_iv (iv,
854 &identity->hashPubKey.bits,
855 sizeof(identity->hashPubKey.bits),
861 * Derive an IV from pong packet information
864 derive_pong_iv (struct GNUNET_CRYPTO_AesInitializationVector *iv,
865 const struct GNUNET_CRYPTO_AesSessionKey *skey, uint32_t seed,
866 uint32_t challenge, const struct GNUNET_PeerIdentity *identity)
868 static const char ctx[] = "pong initialization vector";
870 GNUNET_CRYPTO_aes_derive_iv (iv,
874 &identity->hashPubKey.bits,
875 sizeof(identity->hashPubKey.bits),
884 * At what time should the connection to the given neighbour
885 * time out (given no further activity?)
887 * @param n neighbour in question
888 * @return absolute timeout
890 static struct GNUNET_TIME_Absolute
891 get_neighbour_timeout (struct Neighbour *n)
893 return GNUNET_TIME_absolute_add (n->last_activity,
894 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
899 * Helper function for update_preference_sum.
902 update_preference (void *cls,
903 const GNUNET_HashCode *key,
906 unsigned long long *ps = cls;
907 struct Neighbour *n = value;
909 n->current_preference /= 2;
910 *ps += n->current_preference;
916 * A preference value for a neighbour was update. Update
917 * the preference sum accordingly.
919 * @param inc how much was a preference value increased?
922 update_preference_sum (unsigned long long inc)
924 unsigned long long os;
927 preference_sum += inc;
928 if (preference_sum >= os)
930 /* overflow! compensate by cutting all values in half! */
932 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
935 GNUNET_STATISTICS_set (stats, gettext_noop ("# total peer preference"), preference_sum, GNUNET_NO);
940 * Find the entry for the given neighbour.
942 * @param peer identity of the neighbour
943 * @return NULL if we are not connected, otherwise the
946 static struct Neighbour *
947 find_neighbour (const struct GNUNET_PeerIdentity *peer)
949 return GNUNET_CONTAINER_multihashmap_get (neighbours, &peer->hashPubKey);
954 * Send a message to one of our clients.
956 * @param client target for the message
957 * @param msg message to transmit
958 * @param can_drop could this message be dropped if the
959 * client's queue is getting too large?
962 send_to_client (struct Client *client,
963 const struct GNUNET_MessageHeader *msg,
966 #if DEBUG_CORE_CLIENT
967 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
968 "Preparing to send %u bytes of message of type %u to client.\n",
969 (unsigned int) ntohs (msg->size),
970 (unsigned int) ntohs (msg->type));
972 GNUNET_SERVER_notification_context_unicast (notifier,
973 client->client_handle,
980 * Send a message to all of our current clients that have
981 * the right options set.
983 * @param msg message to multicast
984 * @param can_drop can this message be discarded if the queue is too long
985 * @param options mask to use
988 send_to_all_clients (const struct GNUNET_MessageHeader *msg,
997 if (0 != (c->options & options))
999 #if DEBUG_CORE_CLIENT
1000 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1001 "Sending message of type %u to client.\n",
1002 (unsigned int) ntohs (msg->type));
1004 send_to_client (c, msg, can_drop);
1012 * Function called by transport telling us that a peer
1015 * @param n the peer that changed status
1018 handle_peer_status_change (struct Neighbour *n)
1020 struct PeerStatusNotifyMessage *psnm;
1021 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1022 struct GNUNET_TRANSPORT_ATS_Information *ats;
1025 if ( (! n->is_connected) ||
1026 (n->status != PEER_STATE_KEY_CONFIRMED) )
1029 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1030 "Peer `%4s' changed status\n",
1031 GNUNET_i2s (&n->peer));
1033 size = sizeof (struct PeerStatusNotifyMessage) +
1034 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1035 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1038 /* recovery strategy: throw away performance data */
1039 GNUNET_array_grow (n->ats,
1042 size = sizeof (struct PeerStatusNotifyMessage) +
1043 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1045 psnm = (struct PeerStatusNotifyMessage*) buf;
1046 psnm->header.size = htons (size);
1047 psnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE);
1048 psnm->timeout = GNUNET_TIME_absolute_hton (get_neighbour_timeout (n));
1049 psnm->bandwidth_in = n->bw_in;
1050 psnm->bandwidth_out = n->bw_out;
1051 psnm->peer = n->peer;
1052 psnm->ats_count = htonl (n->ats_count);
1056 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
1057 ats[n->ats_count].type = htonl (0);
1058 ats[n->ats_count].value = htonl (0);
1059 send_to_all_clients (&psnm->header,
1061 GNUNET_CORE_OPTION_SEND_STATUS_CHANGE);
1062 GNUNET_STATISTICS_update (stats,
1063 gettext_noop ("# peer status changes"),
1070 * Go over our message queue and if it is not too long, go
1071 * over the pending requests from clients for this
1072 * neighbour and send some clients a 'READY' notification.
1074 * @param n which peer to process
1077 schedule_peer_messages (struct Neighbour *n)
1079 struct SendMessageReady smr;
1080 struct ClientActiveRequest *car;
1081 struct ClientActiveRequest *pos;
1083 struct MessageEntry *mqe;
1084 unsigned int queue_size;
1086 /* check if neighbour queue is empty enough! */
1096 if (queue_size >= MAX_PEER_QUEUE_SIZE)
1098 #if DEBUG_CORE_CLIENT
1099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1100 "Not considering client transmission requests: queue full\n");
1102 return; /* queue still full */
1104 /* find highest priority request */
1105 pos = n->active_client_request_head;
1109 if ( (car == NULL) ||
1110 (pos->priority > car->priority) )
1117 car = n->active_client_request_head;
1120 return; /* no pending requests */
1121 #if DEBUG_CORE_CLIENT
1122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1123 "Permitting client transmission request to `%s'\n",
1124 GNUNET_i2s (&n->peer));
1127 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1128 n->active_client_request_tail,
1130 GNUNET_assert (GNUNET_YES ==
1131 GNUNET_CONTAINER_multihashmap_remove (c->requests,
1132 &n->peer.hashPubKey,
1134 smr.header.size = htons (sizeof (struct SendMessageReady));
1135 smr.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_READY);
1136 smr.size = htons (car->msize);
1137 smr.smr_id = car->smr_id;
1139 send_to_client (c, &smr.header, GNUNET_NO);
1145 * Handle CORE_SEND_REQUEST message.
1148 handle_client_send_request (void *cls,
1149 struct GNUNET_SERVER_Client *client,
1150 const struct GNUNET_MessageHeader *message)
1152 const struct SendMessageRequest *req;
1153 struct Neighbour *n;
1155 struct ClientActiveRequest *car;
1157 req = (const struct SendMessageRequest*) message;
1158 if (0 == memcmp (&req->peer,
1160 sizeof (struct GNUNET_PeerIdentity)))
1163 n = find_neighbour (&req->peer);
1165 (GNUNET_YES != n->is_connected) ||
1166 (n->status != PEER_STATE_KEY_CONFIRMED) )
1168 /* neighbour must have disconnected since request was issued,
1169 ignore (client will realize it once it processes the
1170 disconnect notification) */
1171 #if DEBUG_CORE_CLIENT
1172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1173 "Dropped client request for transmission (am disconnected)\n");
1175 GNUNET_STATISTICS_update (stats,
1176 gettext_noop ("# send requests dropped (disconnected)"),
1179 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1183 while ( (c != NULL) &&
1184 (c->client_handle != client) )
1188 /* client did not send INIT first! */
1190 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1193 if (c->requests == NULL)
1194 c->requests = GNUNET_CONTAINER_multihashmap_create (16);
1195 #if DEBUG_CORE_CLIENT
1196 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1197 "Received client transmission request. queueing\n");
1199 car = GNUNET_CONTAINER_multihashmap_get (c->requests,
1200 &req->peer.hashPubKey);
1203 /* create new entry */
1204 car = GNUNET_malloc (sizeof (struct ClientActiveRequest));
1205 GNUNET_assert (GNUNET_OK ==
1206 GNUNET_CONTAINER_multihashmap_put (c->requests,
1207 &req->peer.hashPubKey,
1209 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
1210 GNUNET_CONTAINER_DLL_insert (n->active_client_request_head,
1211 n->active_client_request_tail,
1215 car->deadline = GNUNET_TIME_absolute_ntoh (req->deadline);
1216 car->priority = ntohl (req->priority);
1217 car->queue_size = ntohl (req->queue_size);
1218 car->msize = ntohs (req->size);
1219 car->smr_id = req->smr_id;
1220 schedule_peer_messages (n);
1221 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1226 * Notify client about an existing connection to one of our neighbours.
1229 notify_client_about_neighbour (void *cls,
1230 const GNUNET_HashCode *key,
1233 struct Client *c = cls;
1234 struct Neighbour *n = value;
1236 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1237 struct GNUNET_TRANSPORT_ATS_Information *ats;
1238 struct ConnectNotifyMessage *cnm;
1240 size = sizeof (struct ConnectNotifyMessage) +
1241 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1242 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1245 /* recovery strategy: throw away performance data */
1246 GNUNET_array_grow (n->ats,
1249 size = sizeof (struct ConnectNotifyMessage) +
1250 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1252 cnm = (struct ConnectNotifyMessage*) buf;
1253 cnm->header.size = htons (size);
1254 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1255 cnm->ats_count = htonl (n->ats_count);
1259 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * n->ats_count);
1260 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1261 ats[n->ats_count].value = htonl (0);
1262 if (n->status == PEER_STATE_KEY_CONFIRMED)
1264 #if DEBUG_CORE_CLIENT
1265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1266 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
1268 cnm->peer = n->peer;
1269 send_to_client (c, &cnm->header, GNUNET_NO);
1277 * Handle CORE_INIT request.
1280 handle_client_init (void *cls,
1281 struct GNUNET_SERVER_Client *client,
1282 const struct GNUNET_MessageHeader *message)
1284 const struct InitMessage *im;
1285 struct InitReplyMessage irm;
1288 const uint16_t *types;
1292 #if DEBUG_CORE_CLIENT
1293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1294 "Client connecting to core service with `%s' message\n",
1297 /* check that we don't have an entry already */
1301 if (client == c->client_handle)
1304 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1309 msize = ntohs (message->size);
1310 if (msize < sizeof (struct InitMessage))
1313 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1316 GNUNET_SERVER_notification_context_add (notifier, client);
1317 im = (const struct InitMessage *) message;
1318 types = (const uint16_t *) &im[1];
1319 msize -= sizeof (struct InitMessage);
1320 c = GNUNET_malloc (sizeof (struct Client) + msize);
1321 c->client_handle = client;
1324 c->tcnt = msize / sizeof (uint16_t);
1325 c->types = (const uint16_t *) &c[1];
1326 wtypes = (uint16_t *) &c[1];
1327 for (i=0;i<c->tcnt;i++)
1328 wtypes[i] = ntohs (types[i]);
1329 c->options = ntohl (im->options);
1330 #if DEBUG_CORE_CLIENT
1331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1332 "Client %p is interested in %u message types\n",
1334 (unsigned int) c->tcnt);
1336 /* send init reply message */
1337 irm.header.size = htons (sizeof (struct InitReplyMessage));
1338 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
1339 irm.reserved = htonl (0);
1340 memcpy (&irm.publicKey,
1342 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1343 #if DEBUG_CORE_CLIENT
1344 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1345 "Sending `%s' message to client.\n", "INIT_REPLY");
1347 send_to_client (c, &irm.header, GNUNET_NO);
1348 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
1350 /* notify new client about existing neighbours */
1351 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
1352 ¬ify_client_about_neighbour,
1355 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1360 * Free client request records.
1363 * @param key identity of peer for which this is an active request
1364 * @param value the 'struct ClientActiveRequest' to free
1365 * @return GNUNET_YES (continue iteration)
1368 destroy_active_client_request (void *cls,
1369 const GNUNET_HashCode *key,
1372 struct ClientActiveRequest *car = value;
1373 struct Neighbour *n;
1374 struct GNUNET_PeerIdentity peer;
1376 peer.hashPubKey = *key;
1377 n = find_neighbour (&peer);
1378 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1379 n->active_client_request_tail,
1387 * A client disconnected, clean up.
1389 * @param cls closure
1390 * @param client identification of the client
1393 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
1396 struct Client *prev;
1400 #if DEBUG_CORE_CLIENT
1401 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1402 "Client %p has disconnected from core service.\n",
1409 if (client == pos->client_handle)
1416 /* client never sent INIT */
1420 clients = pos->next;
1422 prev->next = pos->next;
1423 if (pos->requests != NULL)
1425 GNUNET_CONTAINER_multihashmap_iterate (pos->requests,
1426 &destroy_active_client_request,
1428 GNUNET_CONTAINER_multihashmap_destroy (pos->requests);
1435 * Helper function for handle_client_iterate_peers.
1438 queue_connect_message (void *cls,
1439 const GNUNET_HashCode *key,
1442 struct GNUNET_SERVER_TransmitContext *tc = cls;
1443 struct Neighbour *n = value;
1444 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1445 struct GNUNET_TRANSPORT_ATS_Information *ats;
1447 struct ConnectNotifyMessage *cnm;
1449 cnm = (struct ConnectNotifyMessage*) buf;
1450 if (n->status != PEER_STATE_KEY_CONFIRMED)
1452 size = sizeof (struct ConnectNotifyMessage) +
1453 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1454 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1457 /* recovery strategy: throw away performance data */
1458 GNUNET_array_grow (n->ats,
1461 size = sizeof (struct PeerStatusNotifyMessage) +
1462 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1464 cnm = (struct ConnectNotifyMessage*) buf;
1465 cnm->header.size = htons (size);
1466 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1467 cnm->ats_count = htonl (n->ats_count);
1471 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
1472 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1473 ats[n->ats_count].value = htonl (0);
1474 #if DEBUG_CORE_CLIENT
1475 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1476 "Sending `%s' message to client.\n",
1479 cnm->peer = n->peer;
1480 GNUNET_SERVER_transmit_context_append_message (tc,
1487 * Handle CORE_ITERATE_PEERS request.
1490 * @param client client sending the iteration request
1491 * @param message iteration request message
1494 handle_client_iterate_peers (void *cls,
1495 struct GNUNET_SERVER_Client *client,
1496 const struct GNUNET_MessageHeader *message)
1499 struct GNUNET_MessageHeader done_msg;
1500 struct GNUNET_SERVER_TransmitContext *tc;
1501 struct GNUNET_PeerIdentity *peer;
1503 /* notify new client about existing neighbours */
1505 msize = ntohs(message->size);
1506 tc = GNUNET_SERVER_transmit_context_create (client);
1507 if (msize == sizeof(struct GNUNET_MessageHeader))
1508 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &queue_connect_message, tc);
1509 else if (msize == sizeof(struct GNUNET_MessageHeader) + sizeof(struct GNUNET_PeerIdentity))
1511 peer = (struct GNUNET_PeerIdentity *)&message[1];
1512 GNUNET_CONTAINER_multihashmap_get_multiple(neighbours, &peer->hashPubKey, &queue_connect_message, tc);
1517 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1518 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
1519 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
1520 GNUNET_SERVER_transmit_context_run (tc,
1521 GNUNET_TIME_UNIT_FOREVER_REL);
1526 * Handle REQUEST_INFO request.
1529 handle_client_request_info (void *cls,
1530 struct GNUNET_SERVER_Client *client,
1531 const struct GNUNET_MessageHeader *message)
1533 const struct RequestInfoMessage *rcm;
1535 struct Neighbour *n;
1536 struct ConfigurationInfoMessage cim;
1537 int32_t want_reserv;
1539 unsigned long long old_preference;
1541 #if DEBUG_CORE_CLIENT
1542 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1543 "Core service receives `%s' request.\n", "REQUEST_INFO");
1548 if (client == pos->client_handle)
1555 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1559 rcm = (const struct RequestInfoMessage *) message;
1560 n = find_neighbour (&rcm->peer);
1561 memset (&cim, 0, sizeof (cim));
1564 want_reserv = ntohl (rcm->reserve_inbound);
1565 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1567 n->bw_out_internal_limit = rcm->limit_outbound;
1568 if (n->bw_out.value__ != GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1569 n->bw_out_external_limit).value__)
1571 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1572 n->bw_out_external_limit);
1573 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1575 GNUNET_TRANSPORT_set_quota (transport,
1579 GNUNET_TIME_UNIT_FOREVER_REL,
1581 handle_peer_status_change (n);
1584 if (want_reserv < 0)
1586 got_reserv = want_reserv;
1588 else if (want_reserv > 0)
1590 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1591 want_reserv).rel_value == 0)
1592 got_reserv = want_reserv;
1594 got_reserv = 0; /* all or nothing */
1598 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1600 old_preference = n->current_preference;
1601 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1602 if (old_preference > n->current_preference)
1604 /* overflow; cap at maximum value */
1605 n->current_preference = ULLONG_MAX;
1607 update_preference_sum (n->current_preference - old_preference);
1608 #if DEBUG_CORE_QUOTA
1609 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1610 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1612 GNUNET_i2s (&rcm->peer),
1615 cim.reserved_amount = htonl (got_reserv);
1616 cim.rim_id = rcm->rim_id;
1617 cim.bw_out = n->bw_out;
1618 cim.preference = n->current_preference;
1620 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1621 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1622 cim.peer = rcm->peer;
1623 #if DEBUG_CORE_CLIENT
1624 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1625 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1627 send_to_client (pos, &cim.header, GNUNET_NO);
1628 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1633 * Free the given entry for the neighbour (it has
1634 * already been removed from the list at this point).
1636 * @param n neighbour to free
1639 free_neighbour (struct Neighbour *n)
1641 struct MessageEntry *m;
1642 struct ClientActiveRequest *car;
1645 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1646 "Destroying neighbour entry for peer `%4s'\n",
1647 GNUNET_i2s (&n->peer));
1649 if (n->pitr != NULL)
1651 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1656 GNUNET_free (n->skm);
1659 while (NULL != (m = n->messages))
1661 n->messages = m->next;
1664 while (NULL != (m = n->encrypted_head))
1666 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1671 while (NULL != (car = n->active_client_request_head))
1673 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1674 n->active_client_request_tail,
1676 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
1677 &n->peer.hashPubKey,
1683 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1686 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1687 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
1688 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1689 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
1690 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1691 GNUNET_SCHEDULER_cancel (n->quota_update_task);
1692 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1693 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1694 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1695 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
1696 if (n->status == PEER_STATE_KEY_CONFIRMED)
1697 GNUNET_STATISTICS_update (stats,
1698 gettext_noop ("# established sessions"),
1701 GNUNET_array_grow (n->ats, n->ats_count, 0);
1702 GNUNET_free_non_null (n->public_key);
1703 GNUNET_free_non_null (n->pending_ping);
1704 GNUNET_free_non_null (n->pending_pong);
1710 * Check if we have encrypted messages for the specified neighbour
1711 * pending, and if so, check with the transport about sending them
1714 * @param n neighbour to check.
1716 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1720 * Encrypt size bytes from in and write the result to out. Use the
1721 * key for outbound traffic of the given neighbour.
1723 * @param n neighbour we are sending to
1724 * @param iv initialization vector to use
1725 * @param in ciphertext
1726 * @param out plaintext
1727 * @param size size of in/out
1728 * @return GNUNET_OK on success
1731 do_encrypt (struct Neighbour *n,
1732 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1733 const void *in, void *out, size_t size)
1735 if (size != (uint16_t) size)
1740 GNUNET_assert (size ==
1741 GNUNET_CRYPTO_aes_encrypt (in,
1745 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1748 "Encrypted %u bytes for `%4s' using key %u, IV %u\n",
1749 (unsigned int) size,
1750 GNUNET_i2s (&n->peer),
1751 (unsigned int) n->encrypt_key.crc32,
1752 GNUNET_CRYPTO_crc32_n (iv, sizeof(iv)));
1759 * Consider freeing the given neighbour since we may not need
1760 * to keep it around anymore.
1762 * @param n neighbour to consider discarding
1765 consider_free_neighbour (struct Neighbour *n);
1769 * Task triggered when a neighbour entry is about to time out
1770 * (and we should prevent this by sending a PING).
1772 * @param cls the 'struct Neighbour'
1773 * @param tc scheduler context (not used)
1776 send_keep_alive (void *cls,
1777 const struct GNUNET_SCHEDULER_TaskContext *tc)
1779 struct Neighbour *n = cls;
1780 struct GNUNET_TIME_Relative retry;
1781 struct GNUNET_TIME_Relative left;
1782 struct MessageEntry *me;
1783 struct PingMessage pp;
1784 struct PingMessage *pm;
1785 struct GNUNET_CRYPTO_AesInitializationVector iv;
1787 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1789 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1790 sizeof (struct PingMessage));
1791 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1792 me->priority = PING_PRIORITY;
1793 me->size = sizeof (struct PingMessage);
1794 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1798 pm = (struct PingMessage *) &me[1];
1799 pm->header.size = htons (sizeof (struct PingMessage));
1800 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1801 pm->iv_seed = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1803 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
1804 pp.challenge = n->ping_challenge;
1805 pp.target = n->peer;
1807 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1808 "Encrypting `%s' message with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
1810 (unsigned int) n->ping_challenge,
1811 GNUNET_i2s (&n->peer),
1812 (unsigned int) n->encrypt_key.crc32,
1813 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
1820 sizeof (struct PingMessage) -
1821 ((void *) &pm->target - (void *) pm));
1822 process_encrypted_neighbour_queue (n);
1823 /* reschedule PING job */
1824 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1825 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1826 MIN_PING_FREQUENCY);
1828 = GNUNET_SCHEDULER_add_delayed (retry,
1836 * Task triggered when a neighbour entry might have gotten stale.
1838 * @param cls the 'struct Neighbour'
1839 * @param tc scheduler context (not used)
1842 consider_free_task (void *cls,
1843 const struct GNUNET_SCHEDULER_TaskContext *tc)
1845 struct Neighbour *n = cls;
1847 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1848 consider_free_neighbour (n);
1853 * Consider freeing the given neighbour since we may not need
1854 * to keep it around anymore.
1856 * @param n neighbour to consider discarding
1859 consider_free_neighbour (struct Neighbour *n)
1861 struct GNUNET_TIME_Relative left;
1863 if ( (n->th != NULL) ||
1864 (n->pitr != NULL) ||
1865 (GNUNET_YES == n->is_connected) )
1866 return; /* no chance */
1868 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1869 if (left.rel_value > 0)
1871 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1872 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1873 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (left,
1874 &consider_free_task,
1878 /* actually free the neighbour... */
1879 GNUNET_assert (GNUNET_OK ==
1880 GNUNET_CONTAINER_multihashmap_remove (neighbours,
1881 &n->peer.hashPubKey,
1883 GNUNET_STATISTICS_set (stats,
1884 gettext_noop ("# neighbour entries allocated"),
1885 GNUNET_CONTAINER_multihashmap_size (neighbours),
1892 * Function called when the transport service is ready to
1893 * receive an encrypted message for the respective peer
1895 * @param cls neighbour to use message from
1896 * @param size number of bytes we can transmit
1897 * @param buf where to copy the message
1898 * @return number of bytes transmitted
1901 notify_encrypted_transmit_ready (void *cls,
1905 struct Neighbour *n = cls;
1906 struct MessageEntry *m;
1911 m = n->encrypted_head;
1915 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1916 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1917 GNUNET_i2s (&n->peer));
1921 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1928 GNUNET_assert (size >= m->size);
1929 memcpy (cbuf, &m[1], m->size);
1931 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1934 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1935 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1936 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1938 GNUNET_i2s (&n->peer));
1940 process_encrypted_neighbour_queue (n);
1945 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1946 "Transmission of message of type %u and size %u failed\n",
1947 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1948 (unsigned int) m->size);
1952 consider_free_neighbour (n);
1953 GNUNET_STATISTICS_update (stats,
1954 gettext_noop ("# encrypted bytes given to transport"),
1962 * Check if we have plaintext messages for the specified neighbour
1963 * pending, and if so, consider batching and encrypting them (and
1964 * then trigger processing of the encrypted queue if needed).
1966 * @param n neighbour to check.
1968 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1972 * Check if we have encrypted messages for the specified neighbour
1973 * pending, and if so, check with the transport about sending them
1976 * @param n neighbour to check.
1979 process_encrypted_neighbour_queue (struct Neighbour *n)
1981 struct MessageEntry *m;
1984 return; /* request already pending */
1985 m = n->encrypted_head;
1988 /* encrypted queue empty, try plaintext instead */
1989 process_plaintext_neighbour_queue (n);
1993 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1994 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1995 (unsigned int) m->size,
1996 GNUNET_i2s (&n->peer),
1997 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
2000 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
2003 GNUNET_TIME_absolute_get_remaining
2005 ¬ify_encrypted_transmit_ready,
2009 /* message request too large or duplicate request */
2011 /* discard encrypted message */
2012 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
2016 process_encrypted_neighbour_queue (n);
2022 * Decrypt size bytes from in and write the result to out. Use the
2023 * key for inbound traffic of the given neighbour. This function does
2024 * NOT do any integrity-checks on the result.
2026 * @param n neighbour we are receiving from
2027 * @param iv initialization vector to use
2028 * @param in ciphertext
2029 * @param out plaintext
2030 * @param size size of in/out
2031 * @return GNUNET_OK on success
2034 do_decrypt (struct Neighbour *n,
2035 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
2036 const void *in, void *out, size_t size)
2038 if (size != (uint16_t) size)
2043 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
2044 (n->status != PEER_STATE_KEY_CONFIRMED))
2046 GNUNET_break_op (0);
2047 return GNUNET_SYSERR;
2050 GNUNET_CRYPTO_aes_decrypt (in,
2057 return GNUNET_SYSERR;
2059 GNUNET_STATISTICS_update (stats,
2060 gettext_noop ("# bytes decrypted"),
2064 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2065 "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
2066 (unsigned int) size,
2067 GNUNET_i2s (&n->peer),
2068 (unsigned int) n->decrypt_key.crc32,
2069 GNUNET_CRYPTO_crc32_n (iv, sizeof(*iv)));
2076 * Select messages for transmission. This heuristic uses a combination
2077 * of earliest deadline first (EDF) scheduling (with bounded horizon)
2078 * and priority-based discard (in case no feasible schedule exist) and
2079 * speculative optimization (defer any kind of transmission until
2080 * we either create a batch of significant size, 25% of max, or until
2081 * we are close to a deadline). Furthermore, when scheduling the
2082 * heuristic also packs as many messages into the batch as possible,
2083 * starting with those with the earliest deadline. Yes, this is fun.
2085 * @param n neighbour to select messages from
2086 * @param size number of bytes to select for transmission
2087 * @param retry_time set to the time when we should try again
2088 * (only valid if this function returns zero)
2089 * @return number of bytes selected, or 0 if we decided to
2090 * defer scheduling overall; in that case, retry_time is set.
2093 select_messages (struct Neighbour *n,
2094 size_t size, struct GNUNET_TIME_Relative *retry_time)
2096 struct MessageEntry *pos;
2097 struct MessageEntry *min;
2098 struct MessageEntry *last;
2099 unsigned int min_prio;
2100 struct GNUNET_TIME_Absolute t;
2101 struct GNUNET_TIME_Absolute now;
2102 struct GNUNET_TIME_Relative delta;
2104 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
2107 unsigned int queue_size;
2108 int discard_low_prio;
2110 GNUNET_assert (NULL != n->messages);
2111 now = GNUNET_TIME_absolute_get ();
2112 /* last entry in linked list of messages processed */
2114 /* should we remove the entry with the lowest
2115 priority from consideration for scheduling at the
2126 discard_low_prio = GNUNET_YES;
2127 while (GNUNET_YES == discard_low_prio)
2130 min_prio = UINT_MAX;
2131 discard_low_prio = GNUNET_NO;
2132 /* calculate number of bytes available for transmission at time "t" */
2133 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
2135 /* how many bytes have we (hypothetically) scheduled so far */
2137 /* maximum time we can wait before transmitting anything
2138 and still make all of our deadlines */
2139 slack = GNUNET_TIME_UNIT_FOREVER_REL;
2141 /* note that we use "*2" here because we want to look
2142 a bit further into the future; much more makes no
2143 sense since new message might be scheduled in the
2145 while ((pos != NULL) && (off < size * 2))
2147 if (pos->do_transmit == GNUNET_YES)
2149 /* already removed from consideration */
2153 if (discard_low_prio == GNUNET_NO)
2155 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
2156 if (delta.rel_value > 0)
2158 // FIXME: HUH? Check!
2160 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
2163 if (avail < pos->size)
2165 // FIXME: HUH? Check!
2166 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
2171 /* update slack, considering both its absolute deadline
2172 and relative deadlines caused by other messages
2173 with their respective load */
2174 slack = GNUNET_TIME_relative_min (slack,
2175 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
2177 if (pos->deadline.abs_value <= now.abs_value)
2180 slack = GNUNET_TIME_UNIT_ZERO;
2182 else if (GNUNET_YES == pos->got_slack)
2184 /* should be soon now! */
2185 slack = GNUNET_TIME_relative_min (slack,
2186 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
2191 GNUNET_TIME_relative_min (slack,
2192 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
2193 pos->got_slack = GNUNET_YES;
2194 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
2195 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
2200 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
2201 if (pos->priority <= min_prio)
2203 /* update min for discard */
2204 min_prio = pos->priority;
2209 if (discard_low_prio)
2211 GNUNET_assert (min != NULL);
2212 /* remove lowest-priority entry from consideration */
2213 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
2217 /* guard against sending "tiny" messages with large headers without
2219 if ( (slack.rel_value > GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value) &&
2221 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
2223 /* less than 25% of message would be filled with deadlines still
2224 being met if we delay by one second or more; so just wait for
2225 more data; but do not wait longer than 1s (since we don't want
2226 to delay messages for a really long time either). */
2227 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
2228 /* reset do_transmit values for next time */
2231 pos->do_transmit = GNUNET_NO;
2234 GNUNET_STATISTICS_update (stats,
2235 gettext_noop ("# transmissions delayed due to corking"),
2238 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2239 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
2240 (unsigned long long) retry_time->rel_value,
2242 (unsigned int) size);
2246 /* select marked messages (up to size) for transmission */
2251 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
2253 pos->do_transmit = GNUNET_YES; /* mark for transmission */
2257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2258 "Selecting message of size %u for transmission\n",
2259 (unsigned int) pos->size);
2265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2266 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
2267 (unsigned int) pos->size,
2270 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
2275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2276 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
2277 (unsigned long long) off, (unsigned long long) tsize,
2278 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
2279 GNUNET_i2s (&n->peer));
2286 * Batch multiple messages into a larger buffer.
2288 * @param n neighbour to take messages from
2289 * @param buf target buffer
2290 * @param size size of buf
2291 * @param deadline set to transmission deadline for the result
2292 * @param retry_time set to the time when we should try again
2293 * (only valid if this function returns zero)
2294 * @param priority set to the priority of the batch
2295 * @return number of bytes written to buf (can be zero)
2298 batch_message (struct Neighbour *n,
2301 struct GNUNET_TIME_Absolute *deadline,
2302 struct GNUNET_TIME_Relative *retry_time,
2303 unsigned int *priority)
2305 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
2306 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
2307 struct MessageEntry *pos;
2308 struct MessageEntry *prev;
2309 struct MessageEntry *next;
2314 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2315 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
2316 if (0 == select_messages (n, size, retry_time))
2319 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2320 "No messages selected, will try again in %llu ms\n",
2321 retry_time->rel_value);
2325 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
2326 ntm->ats_count = htonl (0);
2327 ntm->ats.type = htonl (0);
2328 ntm->ats.value = htonl (0);
2329 ntm->peer = n->peer;
2332 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
2335 if (GNUNET_YES == pos->do_transmit)
2337 GNUNET_assert (pos->size <= size);
2338 /* do notifications */
2339 /* FIXME: track if we have *any* client that wants
2340 full notifications and only do this if that is
2342 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
2344 memcpy (&ntm[1], &pos[1], pos->size);
2345 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2346 sizeof (struct GNUNET_MessageHeader));
2347 send_to_all_clients (&ntm->header,
2349 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
2353 /* message too large for 'full' notifications, we do at
2354 least the 'hdr' type */
2357 sizeof (struct GNUNET_MessageHeader));
2359 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2361 send_to_all_clients (&ntm->header,
2363 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
2365 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2366 "Encrypting %u bytes with message of type %u and size %u\n",
2368 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
2369 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
2371 /* copy for encrypted transmission */
2372 memcpy (&buf[ret], &pos[1], pos->size);
2375 *priority += pos->priority;
2377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2378 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
2379 (unsigned int) pos->size,
2380 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).rel_value);
2382 deadline->abs_value = GNUNET_MIN (deadline->abs_value, pos->deadline.abs_value);
2396 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2397 "Deadline for message batch is %llu ms\n",
2398 GNUNET_TIME_absolute_get_remaining (*deadline).rel_value);
2405 * Remove messages with deadlines that have long expired from
2408 * @param n neighbour to inspect
2411 discard_expired_messages (struct Neighbour *n)
2413 struct MessageEntry *prev;
2414 struct MessageEntry *next;
2415 struct MessageEntry *pos;
2416 struct GNUNET_TIME_Absolute now;
2417 struct GNUNET_TIME_Relative delta;
2421 now = GNUNET_TIME_absolute_get ();
2427 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
2428 if (delta.rel_value > PAST_EXPIRATION_DISCARD_TIME.rel_value)
2431 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2432 "Message is %llu ms past due, discarding.\n",
2439 GNUNET_STATISTICS_update (stats,
2440 gettext_noop ("# messages discarded (expired prior to transmission)"),
2450 if (GNUNET_YES == disc)
2451 schedule_peer_messages (n);
2456 * Signature of the main function of a task.
2458 * @param cls closure
2459 * @param tc context information (why was this task triggered now)
2462 retry_plaintext_processing (void *cls,
2463 const struct GNUNET_SCHEDULER_TaskContext *tc)
2465 struct Neighbour *n = cls;
2467 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2468 process_plaintext_neighbour_queue (n);
2473 * Send our key (and encrypted PING) to the other peer.
2475 * @param n the other peer
2477 static void send_key (struct Neighbour *n);
2480 * Task that will retry "send_key" if our previous attempt failed
2484 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2486 struct Neighbour *n = cls;
2489 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2490 "Retrying key transmission to `%4s'\n",
2491 GNUNET_i2s (&n->peer));
2493 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2494 n->set_key_retry_frequency =
2495 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
2501 * Check if we have plaintext messages for the specified neighbour
2502 * pending, and if so, consider batching and encrypting them (and
2503 * then trigger processing of the encrypted queue if needed).
2505 * @param n neighbour to check.
2508 process_plaintext_neighbour_queue (struct Neighbour *n)
2510 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
2512 struct EncryptedMessage *em; /* encrypted message */
2513 struct EncryptedMessage *ph; /* plaintext header */
2514 struct MessageEntry *me;
2515 unsigned int priority;
2516 struct GNUNET_TIME_Absolute deadline;
2517 struct GNUNET_TIME_Relative retry_time;
2518 struct GNUNET_CRYPTO_AesInitializationVector iv;
2519 struct GNUNET_CRYPTO_AuthKey auth_key;
2521 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
2523 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
2524 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2528 case PEER_STATE_DOWN:
2531 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2532 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2533 GNUNET_i2s(&n->peer));
2536 case PEER_STATE_KEY_SENT:
2537 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2538 n->retry_set_key_task
2539 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2540 &set_key_retry_task, n);
2542 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2543 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2544 GNUNET_i2s(&n->peer));
2547 case PEER_STATE_KEY_RECEIVED:
2548 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2549 n->retry_set_key_task
2550 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2551 &set_key_retry_task, n);
2553 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2554 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2555 GNUNET_i2s(&n->peer));
2558 case PEER_STATE_KEY_CONFIRMED:
2559 /* ready to continue */
2562 discard_expired_messages (n);
2563 if (n->messages == NULL)
2566 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2567 "Plaintext message queue for `%4s' is empty.\n",
2568 GNUNET_i2s(&n->peer));
2570 return; /* no pending messages */
2572 if (n->encrypted_head != NULL)
2575 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2576 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2577 GNUNET_i2s(&n->peer));
2579 return; /* wait for messages already encrypted to be
2582 ph = (struct EncryptedMessage *) pbuf;
2583 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2585 used = sizeof (struct EncryptedMessage);
2586 used += batch_message (n,
2588 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2589 &deadline, &retry_time, &priority);
2590 if (used == sizeof (struct EncryptedMessage))
2593 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2594 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2595 GNUNET_i2s(&n->peer));
2597 /* no messages selected for sending, try again later... */
2598 n->retry_plaintext_task =
2599 GNUNET_SCHEDULER_add_delayed (retry_time,
2600 &retry_plaintext_processing, n);
2603 #if DEBUG_CORE_QUOTA
2604 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2605 "Sending %u b/s as new limit to peer `%4s'\n",
2606 (unsigned int) ntohl (n->bw_in.value__),
2607 GNUNET_i2s (&n->peer));
2609 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
2610 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2611 ph->inbound_bw_limit = n->bw_in;
2612 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2614 /* setup encryption message header */
2615 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2616 me->deadline = deadline;
2617 me->priority = priority;
2619 em = (struct EncryptedMessage *) &me[1];
2620 em->header.size = htons (used);
2621 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2622 em->iv_seed = ph->iv_seed;
2623 derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
2626 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2627 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2628 (unsigned int) used - ENCRYPTED_HEADER_SIZE,
2629 GNUNET_i2s(&n->peer),
2630 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).rel_value);
2632 GNUNET_assert (GNUNET_OK ==
2635 &ph->sequence_number,
2636 &em->sequence_number, used - ENCRYPTED_HEADER_SIZE));
2637 derive_auth_key (&auth_key,
2640 n->encrypt_key_created);
2641 GNUNET_CRYPTO_hmac (&auth_key,
2642 &em->sequence_number,
2643 used - ENCRYPTED_HEADER_SIZE,
2646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2647 "Authenticated %u bytes of ciphertext %u: `%s'\n",
2648 used - ENCRYPTED_HEADER_SIZE,
2649 GNUNET_CRYPTO_crc32_n (&em->sequence_number,
2650 used - ENCRYPTED_HEADER_SIZE),
2651 GNUNET_h2s (&em->hmac));
2653 /* append to transmission list */
2654 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2658 process_encrypted_neighbour_queue (n);
2659 schedule_peer_messages (n);
2664 * Function that recalculates the bandwidth quota for the
2665 * given neighbour and transmits it to the transport service.
2667 * @param cls neighbour for the quota update
2671 neighbour_quota_update (void *cls,
2672 const struct GNUNET_SCHEDULER_TaskContext *tc);
2676 * Schedule the task that will recalculate the bandwidth
2677 * quota for this peer (and possibly force a disconnect of
2678 * idle peers by calculating a bandwidth of zero).
2681 schedule_quota_update (struct Neighbour *n)
2683 GNUNET_assert (n->quota_update_task ==
2684 GNUNET_SCHEDULER_NO_TASK);
2685 n->quota_update_task
2686 = GNUNET_SCHEDULER_add_delayed (QUOTA_UPDATE_FREQUENCY,
2687 &neighbour_quota_update,
2693 * Initialize a new 'struct Neighbour'.
2695 * @param pid ID of the new neighbour
2696 * @return handle for the new neighbour
2698 static struct Neighbour *
2699 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2701 struct Neighbour *n;
2702 struct GNUNET_TIME_Absolute now;
2705 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2706 "Creating neighbour entry for peer `%4s'\n",
2709 n = GNUNET_malloc (sizeof (struct Neighbour));
2711 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2712 now = GNUNET_TIME_absolute_get ();
2713 n->encrypt_key_created = now;
2714 n->last_activity = now;
2715 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2716 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2717 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2718 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2719 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2720 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
2722 GNUNET_assert (GNUNET_OK ==
2723 GNUNET_CONTAINER_multihashmap_put (neighbours,
2724 &n->peer.hashPubKey,
2726 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2727 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
2728 GNUNET_CONTAINER_multihashmap_size (neighbours), GNUNET_NO);
2729 neighbour_quota_update (n, NULL);
2730 consider_free_neighbour (n);
2736 * Handle CORE_SEND request.
2739 * @param client the client issuing the request
2740 * @param message the "struct SendMessage"
2743 handle_client_send (void *cls,
2744 struct GNUNET_SERVER_Client *client,
2745 const struct GNUNET_MessageHeader *message)
2747 const struct SendMessage *sm;
2748 struct Neighbour *n;
2749 struct MessageEntry *prev;
2750 struct MessageEntry *pos;
2751 struct MessageEntry *e;
2752 struct MessageEntry *min_prio_entry;
2753 struct MessageEntry *min_prio_prev;
2754 unsigned int min_prio;
2755 unsigned int queue_size;
2758 msize = ntohs (message->size);
2760 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2762 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));
2765 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2768 sm = (const struct SendMessage *) message;
2769 msize -= sizeof (struct SendMessage);
2770 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2773 GNUNET_SERVER_mst_receive (mst,
2775 (const char*) &sm[1],
2780 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2783 n = find_neighbour (&sm->peer);
2785 n = create_neighbour (&sm->peer);
2787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2788 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2790 (unsigned int) msize,
2791 GNUNET_i2s (&sm->peer));
2793 discard_expired_messages (n);
2794 /* bound queue size */
2795 /* NOTE: this entire block to bound the queue size should be
2796 obsolete with the new client-request code and the
2797 'schedule_peer_messages' mechanism; we still have this code in
2798 here for now as a sanity check for the new mechanmism;
2799 ultimately, we should probably simply reject SEND messages that
2800 are not 'approved' (or provide a new core API for very unreliable
2801 delivery that always sends with priority 0). Food for thought. */
2802 min_prio = UINT32_MAX;
2803 min_prio_entry = NULL;
2804 min_prio_prev = NULL;
2810 if (pos->priority <= min_prio)
2812 min_prio_entry = pos;
2813 min_prio_prev = prev;
2814 min_prio = pos->priority;
2820 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2823 if (ntohl(sm->priority) <= min_prio)
2825 /* discard new entry; this should no longer happen! */
2828 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2829 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2831 (unsigned int) MAX_PEER_QUEUE_SIZE,
2832 (unsigned int) msize,
2833 (unsigned int) ntohs (message->type));
2835 GNUNET_STATISTICS_update (stats,
2836 gettext_noop ("# discarded CORE_SEND requests"),
2840 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2843 GNUNET_assert (min_prio_entry != NULL);
2844 /* discard "min_prio_entry" */
2846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2847 "Queue full, discarding existing older request\n");
2849 GNUNET_STATISTICS_update (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 1, GNUNET_NO);
2850 if (min_prio_prev == NULL)
2851 n->messages = min_prio_entry->next;
2853 min_prio_prev->next = min_prio_entry->next;
2854 GNUNET_free (min_prio_entry);
2858 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2859 "Adding transmission request for `%4s' of size %u to queue\n",
2860 GNUNET_i2s (&sm->peer),
2861 (unsigned int) msize);
2863 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2864 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2865 e->priority = ntohl (sm->priority);
2867 memcpy (&e[1], &sm[1], msize);
2869 /* insert, keep list sorted by deadline */
2872 while ((pos != NULL) && (pos->deadline.abs_value < e->deadline.abs_value))
2883 /* consider scheduling now */
2884 process_plaintext_neighbour_queue (n);
2886 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2891 * Function called when the transport service is ready to
2892 * receive a message. Only resets 'n->th' to NULL.
2894 * @param cls neighbour to use message from
2895 * @param size number of bytes we can transmit
2896 * @param buf where to copy the message
2897 * @return number of bytes transmitted
2900 notify_transport_connect_done (void *cls,
2904 struct Neighbour *n = cls;
2907 if (GNUNET_YES != n->is_connected)
2909 /* transport should only call us to transmit a message after
2910 * telling us about a successful connection to the respective peer */
2912 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2913 "Timeout on notify connect!\n");
2915 GNUNET_STATISTICS_update (stats,
2916 gettext_noop ("# connection requests timed out in transport"),
2923 GNUNET_STATISTICS_update (stats,
2924 gettext_noop ("# connection requests timed out in transport"),
2927 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2928 _("Failed to connect to `%4s': transport failed to connect\n"),
2929 GNUNET_i2s (&n->peer));
2932 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2933 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2934 GNUNET_i2s (&n->peer));
2935 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2936 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2937 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (&set_key_retry_task,
2944 * Handle CORE_REQUEST_CONNECT request.
2947 * @param client the client issuing the request
2948 * @param message the "struct ConnectMessage"
2951 handle_client_request_connect (void *cls,
2952 struct GNUNET_SERVER_Client *client,
2953 const struct GNUNET_MessageHeader *message)
2955 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2956 struct Neighbour *n;
2957 struct GNUNET_TIME_Relative timeout;
2959 if (0 == memcmp (&cm->peer,
2961 sizeof (struct GNUNET_PeerIdentity)))
2963 /* In this case a client has asked us to connect to ourselves, not really an error! */
2964 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2967 GNUNET_break (ntohl (cm->reserved) == 0);
2968 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2969 n = find_neighbour (&cm->peer);
2971 n = create_neighbour (&cm->peer);
2972 if ( (GNUNET_YES == n->is_connected) ||
2975 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2976 "Core received `%s' request for `%4s', already connected!\n",
2978 GNUNET_i2s (&cm->peer));
2979 if (GNUNET_YES == n->is_connected)
2980 GNUNET_STATISTICS_update (stats,
2981 gettext_noop ("# connection requests ignored (already connected)"),
2986 GNUNET_TRANSPORT_notify_transmit_ready_cancel(n->th);
2987 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2989 sizeof (struct GNUNET_MessageHeader), 0,
2991 ¬ify_transport_connect_done,
2993 GNUNET_break (NULL != n->th);
2994 GNUNET_STATISTICS_update (stats,
2995 gettext_noop ("# connection requests retried (due to repeat request connect)"),
2999 return; /* already connected, or at least trying */
3001 GNUNET_STATISTICS_update (stats,
3002 gettext_noop ("# connection requests received"),
3006 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3007 "Core received `%s' request for `%4s', will try to establish connection\n",
3009 GNUNET_i2s (&cm->peer));
3011 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
3012 /* ask transport to connect to the peer */
3013 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3015 sizeof (struct GNUNET_MessageHeader), 0,
3017 ¬ify_transport_connect_done,
3019 GNUNET_break (NULL != n->th);
3024 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3025 * the neighbour's struct and retry send_key. Or, if we did not get a
3026 * HELLO, just do nothing.
3028 * @param cls the 'struct Neighbour' to retry sending the key for
3029 * @param peer the peer for which this is the HELLO
3030 * @param hello HELLO message of that peer
3031 * @param err_msg NULL if successful, otherwise contains error message
3034 process_hello_retry_send_key (void *cls,
3035 const struct GNUNET_PeerIdentity *peer,
3036 const struct GNUNET_HELLO_Message *hello,
3037 const char *err_msg)
3039 struct Neighbour *n = cls;
3041 if (err_msg != NULL)
3043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3044 _("Error in communication with PEERINFO service\n"));
3051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3052 "Entered `%s' and `%s' is NULL!\n",
3053 "process_hello_retry_send_key",
3057 if (n->public_key != NULL)
3059 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3061 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3062 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3064 GNUNET_STATISTICS_update (stats,
3065 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3073 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3074 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
3075 GNUNET_i2s (&n->peer));
3077 GNUNET_STATISTICS_update (stats,
3078 gettext_noop ("# Delayed connecting due to lack of public key"),
3081 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
3082 n->retry_set_key_task
3083 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3084 &set_key_retry_task, n);
3090 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3091 "Entered `%s' for peer `%4s'\n",
3092 "process_hello_retry_send_key",
3095 if (n->public_key != NULL)
3097 /* already have public key, why are we here? */
3103 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3104 "Received new `%s' message for `%4s', initiating key exchange.\n",
3109 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3110 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3112 GNUNET_STATISTICS_update (stats,
3113 gettext_noop ("# Error extracting public key from HELLO"),
3116 GNUNET_free (n->public_key);
3117 n->public_key = NULL;
3119 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3120 "GNUNET_HELLO_get_key returned awfully\n");
3128 * Send our key (and encrypted PING) to the other peer.
3130 * @param n the other peer
3133 send_key (struct Neighbour *n)
3135 struct MessageEntry *pos;
3136 struct SetKeyMessage *sm;
3137 struct MessageEntry *me;
3138 struct PingMessage pp;
3139 struct PingMessage *pm;
3140 struct GNUNET_CRYPTO_AesInitializationVector iv;
3142 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3144 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3145 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3147 if (n->pitr != NULL)
3150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3151 "Key exchange in progress with `%4s'.\n",
3152 GNUNET_i2s (&n->peer));
3154 return; /* already in progress */
3156 if (GNUNET_YES != n->is_connected)
3159 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3160 "Not yet connected to peer `%4s'!\n",
3161 GNUNET_i2s (&n->peer));
3165 GNUNET_STATISTICS_update (stats,
3166 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
3169 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3171 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
3173 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3174 ¬ify_encrypted_transmit_ready,
3180 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3181 "Asked to perform key exchange with `%4s'.\n",
3182 GNUNET_i2s (&n->peer));
3184 if (n->public_key == NULL)
3186 /* lookup n's public key, then try again */
3188 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3189 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
3190 GNUNET_i2s (&n->peer));
3192 GNUNET_assert (n->pitr == NULL);
3193 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3195 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
3196 &process_hello_retry_send_key, n);
3199 pos = n->encrypted_head;
3202 if (GNUNET_YES == pos->is_setkey)
3204 if (pos->sender_status == n->status)
3207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3208 "`%s' message for `%4s' queued already\n",
3210 GNUNET_i2s (&n->peer));
3212 goto trigger_processing;
3214 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
3219 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3220 "Removing queued `%s' message for `%4s', will create a new one\n",
3222 GNUNET_i2s (&n->peer));
3232 case PEER_STATE_DOWN:
3233 n->status = PEER_STATE_KEY_SENT;
3235 case PEER_STATE_KEY_SENT:
3237 case PEER_STATE_KEY_RECEIVED:
3239 case PEER_STATE_KEY_CONFIRMED:
3247 /* first, set key message */
3248 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3249 sizeof (struct SetKeyMessage) +
3250 sizeof (struct PingMessage));
3251 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
3252 me->priority = SET_KEY_PRIORITY;
3253 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
3254 me->is_setkey = GNUNET_YES;
3255 me->got_slack = GNUNET_YES; /* do not defer this one! */
3256 me->sender_status = n->status;
3257 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3261 sm = (struct SetKeyMessage *) &me[1];
3262 sm->header.size = htons (sizeof (struct SetKeyMessage));
3263 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
3264 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
3265 PEER_STATE_KEY_SENT : n->status));
3267 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3268 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3269 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3270 sizeof (struct GNUNET_PeerIdentity));
3271 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
3272 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
3273 sm->target = n->peer;
3274 GNUNET_assert (GNUNET_OK ==
3275 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
3277 GNUNET_CRYPTO_AesSessionKey),
3279 &sm->encrypted_key));
3280 GNUNET_assert (GNUNET_OK ==
3281 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
3283 pm = (struct PingMessage *) &sm[1];
3284 pm->header.size = htons (sizeof (struct PingMessage));
3285 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
3286 pm->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3287 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
3288 pp.challenge = n->ping_challenge;
3289 pp.target = n->peer;
3291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3292 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
3294 (unsigned int) n->ping_challenge,
3295 GNUNET_i2s (&n->peer),
3296 (unsigned int) n->encrypt_key.crc32,
3297 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3304 sizeof (struct PingMessage) -
3305 ((void *) &pm->target - (void *) pm));
3306 GNUNET_STATISTICS_update (stats,
3307 gettext_noop ("# SET_KEY and PING messages created"),
3311 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3312 "Have %llu ms left for `%s' transmission.\n",
3313 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).rel_value,
3317 /* trigger queue processing */
3318 process_encrypted_neighbour_queue (n);
3319 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
3320 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
3321 n->retry_set_key_task
3322 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3323 &set_key_retry_task, n);
3328 * We received a SET_KEY message. Validate and update
3329 * our key material and status.
3331 * @param n the neighbour from which we received message m
3332 * @param m the set key message we received
3333 * @param ats performance data
3334 * @param ats_count number of entries in ats (excluding 0-termination)
3337 handle_set_key (struct Neighbour *n,
3338 const struct SetKeyMessage *m,
3339 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3340 uint32_t ats_count);
3345 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3346 * the neighbour's struct and retry handling the set_key message. Or,
3347 * if we did not get a HELLO, just free the set key message.
3349 * @param cls pointer to the set key message
3350 * @param peer the peer for which this is the HELLO
3351 * @param hello HELLO message of that peer
3352 * @param err_msg NULL if successful, otherwise contains error message
3355 process_hello_retry_handle_set_key (void *cls,
3356 const struct GNUNET_PeerIdentity *peer,
3357 const struct GNUNET_HELLO_Message *hello,
3358 const char *err_msg)
3360 struct Neighbour *n = cls;
3361 struct SetKeyMessage *sm = n->skm;
3363 if (err_msg != NULL)
3365 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3366 _("Error in communication with PEERINFO service\n"));
3374 if (n->public_key != NULL)
3377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3378 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
3380 GNUNET_i2s (&n->peer),
3383 handle_set_key (n, sm, NULL, 0);
3387 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3388 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
3390 GNUNET_i2s (&n->peer));
3395 if (n->public_key != NULL)
3396 return; /* multiple HELLOs match!? */
3398 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3399 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3401 GNUNET_break_op (0);
3402 GNUNET_free (n->public_key);
3403 n->public_key = NULL;
3409 * Merge the given performance data with the data we currently
3410 * track for the given neighbour.
3412 * @param n neighbour
3413 * @param ats new performance data
3414 * @param ats_count number of records in ats
3417 update_neighbour_performance (struct Neighbour *n,
3418 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3426 for (i = 0; i < ats_count; i++)
3428 for (j=0;j < n->ats_count; j++)
3430 if (n->ats[j].type == ats[i].type)
3432 n->ats[j].value = ats[i].value;
3436 if (j == n->ats_count)
3438 GNUNET_array_append (n->ats,
3447 * We received a PING message. Validate and transmit
3450 * @param n sender of the PING
3451 * @param m the encrypted PING message itself
3452 * @param ats performance data
3453 * @param ats_count number of entries in ats (excluding 0-termination)
3456 handle_ping (struct Neighbour *n,
3457 const struct PingMessage *m,
3458 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3461 struct PingMessage t;
3462 struct PongMessage tx;
3463 struct PongMessage *tp;
3464 struct MessageEntry *me;
3465 struct GNUNET_CRYPTO_AesInitializationVector iv;
3468 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3469 "Core service receives `%s' request from `%4s'.\n",
3470 "PING", GNUNET_i2s (&n->peer));
3472 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3478 sizeof (struct PingMessage) -
3479 ((void *) &m->target - (void *) m)))
3482 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3483 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
3485 GNUNET_i2s (&t.target),
3486 (unsigned int) t.challenge,
3487 (unsigned int) n->decrypt_key.crc32,
3488 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3491 GNUNET_STATISTICS_update (stats,
3492 gettext_noop ("# PING messages decrypted"),
3495 if (0 != memcmp (&t.target,
3496 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3498 GNUNET_break_op (0);
3501 update_neighbour_performance (n, ats, ats_count);
3502 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3503 sizeof (struct PongMessage));
3504 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3508 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
3509 me->priority = PONG_PRIORITY;
3510 me->size = sizeof (struct PongMessage);
3511 tx.inbound_bw_limit = n->bw_in;
3512 tx.challenge = t.challenge;
3513 tx.target = t.target;
3514 tp = (struct PongMessage *) &me[1];
3515 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
3516 tp->header.size = htons (sizeof (struct PongMessage));
3517 tp->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3518 derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
3523 sizeof (struct PongMessage) -
3524 ((void *) &tp->challenge - (void *) tp));
3525 GNUNET_STATISTICS_update (stats,
3526 gettext_noop ("# PONG messages created"),
3530 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3531 "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
3533 (unsigned int) t.challenge,
3534 (unsigned int) n->encrypt_key.crc32,
3535 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3538 /* trigger queue processing */
3539 process_encrypted_neighbour_queue (n);
3544 * We received a PONG message. Validate and update our status.
3546 * @param n sender of the PONG
3547 * @param m the encrypted PONG message itself
3548 * @param ats performance data
3549 * @param ats_count number of entries in ats (excluding 0-termination)
3552 handle_pong (struct Neighbour *n,
3553 const struct PongMessage *m,
3554 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3557 struct PongMessage t;
3558 struct ConnectNotifyMessage *cnm;
3559 struct GNUNET_CRYPTO_AesInitializationVector iv;
3560 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
3561 struct GNUNET_TRANSPORT_ATS_Information *mats;
3565 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3566 "Core service receives `%s' response from `%4s'.\n",
3567 "PONG", GNUNET_i2s (&n->peer));
3569 /* mark as garbage, just to be sure */
3570 memset (&t, 255, sizeof (t));
3571 derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
3578 sizeof (struct PongMessage) -
3579 ((void *) &m->challenge - (void *) m)))
3581 GNUNET_break_op (0);
3584 GNUNET_STATISTICS_update (stats,
3585 gettext_noop ("# PONG messages decrypted"),
3589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3590 "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
3592 GNUNET_i2s (&t.target),
3593 (unsigned int) t.challenge,
3594 (unsigned int) n->decrypt_key.crc32,
3595 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3598 if ((0 != memcmp (&t.target,
3600 sizeof (struct GNUNET_PeerIdentity))) ||
3601 (n->ping_challenge != t.challenge))
3603 /* PONG malformed */
3605 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3606 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
3608 GNUNET_i2s (&n->peer),
3609 (unsigned int) n->ping_challenge);
3610 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3611 "Received malformed `%s' received from `%4s' with challenge %u\n",
3612 "PONG", GNUNET_i2s (&t.target),
3613 (unsigned int) t.challenge);
3615 GNUNET_break_op (n->ping_challenge != t.challenge);
3620 case PEER_STATE_DOWN:
3621 GNUNET_break (0); /* should be impossible */
3623 case PEER_STATE_KEY_SENT:
3624 GNUNET_break (0); /* should be impossible, how did we decrypt? */
3626 case PEER_STATE_KEY_RECEIVED:
3627 GNUNET_STATISTICS_update (stats,
3628 gettext_noop ("# Session keys confirmed via PONG"),
3631 n->status = PEER_STATE_KEY_CONFIRMED;
3632 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
3634 n->bw_out_external_limit = t.inbound_bw_limit;
3635 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3636 n->bw_out_internal_limit);
3637 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3639 GNUNET_TRANSPORT_set_quota (transport,
3643 GNUNET_TIME_UNIT_FOREVER_REL,
3647 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3648 "Confirmed key via `%s' message for peer `%4s'\n",
3649 "PONG", GNUNET_i2s (&n->peer));
3651 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3653 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3654 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3656 update_neighbour_performance (n, ats, ats_count);
3657 size = sizeof (struct ConnectNotifyMessage) +
3658 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3659 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3662 /* recovery strategy: throw away performance data */
3663 GNUNET_array_grow (n->ats,
3666 size = sizeof (struct PeerStatusNotifyMessage) +
3667 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3669 cnm = (struct ConnectNotifyMessage*) buf;
3670 cnm->header.size = htons (size);
3671 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
3672 cnm->ats_count = htonl (n->ats_count);
3673 cnm->peer = n->peer;
3677 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
3678 mats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3679 mats[n->ats_count].value = htonl (0);
3680 send_to_all_clients (&cnm->header,
3682 GNUNET_CORE_OPTION_SEND_CONNECT);
3683 process_encrypted_neighbour_queue (n);
3685 case PEER_STATE_KEY_CONFIRMED:
3686 n->last_activity = GNUNET_TIME_absolute_get ();
3687 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3688 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3690 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3693 handle_peer_status_change (n);
3703 * We received a SET_KEY message. Validate and update
3704 * our key material and status.
3706 * @param n the neighbour from which we received message m
3707 * @param m the set key message we received
3708 * @param ats performance data
3709 * @param ats_count number of entries in ats (excluding 0-termination)
3712 handle_set_key (struct Neighbour *n,
3713 const struct SetKeyMessage *m,
3714 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3717 struct SetKeyMessage *m_cpy;
3718 struct GNUNET_TIME_Absolute t;
3719 struct GNUNET_CRYPTO_AesSessionKey k;
3720 struct PingMessage *ping;
3721 struct PongMessage *pong;
3722 enum PeerStateMachine sender_status;
3725 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3726 "Core service receives `%s' request from `%4s'.\n",
3727 "SET_KEY", GNUNET_i2s (&n->peer));
3729 if (n->public_key == NULL)
3731 if (n->pitr != NULL)
3734 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3735 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3741 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3742 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3744 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3745 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3746 /* lookup n's public key, then try again */
3747 GNUNET_assert (n->skm == NULL);
3749 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3751 GNUNET_TIME_UNIT_MINUTES,
3752 &process_hello_retry_handle_set_key, n);
3753 GNUNET_STATISTICS_update (stats,
3754 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3759 if (0 != memcmp (&m->target,
3761 sizeof (struct GNUNET_PeerIdentity)))
3763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3764 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3766 GNUNET_i2s (&m->target));
3769 if ((ntohl (m->purpose.size) !=
3770 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3771 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3772 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3773 sizeof (struct GNUNET_PeerIdentity)) ||
3775 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3776 &m->purpose, &m->signature, n->public_key)))
3778 /* invalid signature */
3779 GNUNET_break_op (0);
3782 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3783 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3784 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3785 (t.abs_value < n->decrypt_key_created.abs_value))
3787 /* this could rarely happen due to massive re-ordering of
3788 messages on the network level, but is most likely either
3789 a bug or some adversary messing with us. Report. */
3790 GNUNET_break_op (0);
3794 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3795 "Decrypting key material.\n");
3797 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3800 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3801 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3802 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3804 /* failed to decrypt !? */
3805 GNUNET_break_op (0);
3808 GNUNET_STATISTICS_update (stats,
3809 gettext_noop ("# SET_KEY messages decrypted"),
3813 if (n->decrypt_key_created.abs_value != t.abs_value)
3815 /* fresh key, reset sequence numbers */
3816 n->last_sequence_number_received = 0;
3817 n->last_packets_bitmap = 0;
3818 n->decrypt_key_created = t;
3820 update_neighbour_performance (n, ats, ats_count);
3821 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3824 case PEER_STATE_DOWN:
3825 n->status = PEER_STATE_KEY_RECEIVED;
3827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3828 "Responding to `%s' with my own key.\n", "SET_KEY");
3832 case PEER_STATE_KEY_SENT:
3833 case PEER_STATE_KEY_RECEIVED:
3834 n->status = PEER_STATE_KEY_RECEIVED;
3835 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3836 (sender_status != PEER_STATE_KEY_CONFIRMED))
3839 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3840 "Responding to `%s' with my own key (other peer has status %u).\n",
3842 (unsigned int) sender_status);
3847 case PEER_STATE_KEY_CONFIRMED:
3848 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3849 (sender_status != PEER_STATE_KEY_CONFIRMED))
3852 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3853 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3855 (unsigned int) sender_status);
3864 if (n->pending_ping != NULL)
3866 ping = n->pending_ping;
3867 n->pending_ping = NULL;
3868 handle_ping (n, ping, NULL, 0);
3871 if (n->pending_pong != NULL)
3873 pong = n->pending_pong;
3874 n->pending_pong = NULL;
3875 handle_pong (n, pong, NULL, 0);
3882 * Send a P2P message to a client.
3884 * @param sender who sent us the message?
3885 * @param client who should we give the message to?
3886 * @param m contains the message to transmit
3887 * @param msize number of bytes in buf to transmit
3890 send_p2p_message_to_client (struct Neighbour *sender,
3891 struct Client *client,
3892 const void *m, size_t msize)
3894 size_t size = msize + sizeof (struct NotifyTrafficMessage) +
3895 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3897 struct NotifyTrafficMessage *ntm;
3898 struct GNUNET_TRANSPORT_ATS_Information *ats;
3900 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3903 /* recovery strategy: throw performance data away... */
3904 GNUNET_array_grow (sender->ats,
3907 size = msize + sizeof (struct NotifyTrafficMessage) +
3908 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3911 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3912 "Core service passes message from `%4s' of type %u to client.\n",
3913 GNUNET_i2s(&sender->peer),
3914 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3916 ntm = (struct NotifyTrafficMessage *) buf;
3917 ntm->header.size = htons (size);
3918 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3919 ntm->ats_count = htonl (sender->ats_count);
3920 ntm->peer = sender->peer;
3924 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * sender->ats_count);
3925 ats[sender->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3926 ats[sender->ats_count].value = htonl (0);
3927 memcpy (&ats[sender->ats_count+1],
3930 send_to_client (client, &ntm->header, GNUNET_YES);
3935 * Deliver P2P message to interested clients.
3937 * @param cls always NULL
3938 * @param client who sent us the message (struct Neighbour)
3939 * @param m the message
3942 deliver_message (void *cls,
3944 const struct GNUNET_MessageHeader *m)
3946 struct Neighbour *sender = client;
3947 size_t msize = ntohs (m->size);
3949 struct Client *cpos;
3955 type = ntohs (m->type);
3957 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3958 "Received encapsulated message of type %u and size %u from `%4s'\n",
3959 (unsigned int) type,
3961 GNUNET_i2s (&sender->peer));
3963 GNUNET_snprintf (buf,
3965 gettext_noop ("# bytes of messages of type %u received"),
3966 (unsigned int) type);
3967 GNUNET_STATISTICS_set (stats,
3971 dropped = GNUNET_YES;
3973 while (cpos != NULL)
3975 deliver_full = GNUNET_NO;
3976 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
3977 deliver_full = GNUNET_YES;
3980 for (tpos = 0; tpos < cpos->tcnt; tpos++)
3982 if (type != cpos->types[tpos])
3984 deliver_full = GNUNET_YES;
3988 if (GNUNET_YES == deliver_full)
3990 send_p2p_message_to_client (sender, cpos, m, msize);
3991 dropped = GNUNET_NO;
3993 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
3995 send_p2p_message_to_client (sender, cpos, m,
3996 sizeof (struct GNUNET_MessageHeader));
4000 if (dropped == GNUNET_YES)
4003 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4004 "Message of type %u from `%4s' not delivered to any client.\n",
4005 (unsigned int) type,
4006 GNUNET_i2s (&sender->peer));
4008 GNUNET_STATISTICS_update (stats,
4009 gettext_noop ("# messages not delivered to any client"),
4016 * We received an encrypted message. Decrypt, validate and
4017 * pass on to the appropriate clients.
4019 * @param n target of the message
4020 * @param m encrypted message
4021 * @param ats performance data
4022 * @param ats_count number of entries in ats (excluding 0-termination)
4025 handle_encrypted_message (struct Neighbour *n,
4026 const struct EncryptedMessage *m,
4027 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4030 size_t size = ntohs (m->header.size);
4032 struct EncryptedMessage *pt; /* plaintext */
4035 struct GNUNET_TIME_Absolute t;
4036 struct GNUNET_CRYPTO_AesInitializationVector iv;
4037 struct GNUNET_CRYPTO_AuthKey auth_key;
4040 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4041 "Core service receives `%s' request from `%4s'.\n",
4042 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
4045 derive_auth_key (&auth_key,
4048 n->decrypt_key_created);
4049 GNUNET_CRYPTO_hmac (&auth_key,
4050 &m->sequence_number,
4051 size - ENCRYPTED_HEADER_SIZE, &ph);
4053 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4054 "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
4055 (unsigned int) size - ENCRYPTED_HEADER_SIZE,
4056 GNUNET_CRYPTO_crc32_n (&m->sequence_number,
4057 size - ENCRYPTED_HEADER_SIZE),
4061 if (0 != memcmp (&ph,
4063 sizeof (GNUNET_HashCode)))
4065 /* checksum failed */
4066 GNUNET_break_op (0);
4069 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
4074 &m->sequence_number,
4075 &buf[ENCRYPTED_HEADER_SIZE],
4076 size - ENCRYPTED_HEADER_SIZE))
4078 pt = (struct EncryptedMessage *) buf;
4080 /* validate sequence number */
4081 snum = ntohl (pt->sequence_number);
4082 if (n->last_sequence_number_received == snum)
4084 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4085 "Received duplicate message, ignoring.\n");
4086 /* duplicate, ignore */
4087 GNUNET_STATISTICS_set (stats,
4088 gettext_noop ("# bytes dropped (duplicates)"),
4093 if ((n->last_sequence_number_received > snum) &&
4094 (n->last_sequence_number_received - snum > 32))
4096 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4097 "Received ancient out of sequence message, ignoring.\n");
4098 /* ancient out of sequence, ignore */
4099 GNUNET_STATISTICS_set (stats,
4100 gettext_noop ("# bytes dropped (out of sequence)"),
4105 if (n->last_sequence_number_received > snum)
4107 unsigned int rotbit =
4108 1 << (n->last_sequence_number_received - snum - 1);
4109 if ((n->last_packets_bitmap & rotbit) != 0)
4111 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4112 "Received duplicate message, ignoring.\n");
4113 GNUNET_STATISTICS_set (stats,
4114 gettext_noop ("# bytes dropped (duplicates)"),
4117 /* duplicate, ignore */
4120 n->last_packets_bitmap |= rotbit;
4122 if (n->last_sequence_number_received < snum)
4124 int shift = (snum - n->last_sequence_number_received);
4125 if (shift >= 8 * sizeof(n->last_packets_bitmap))
4126 n->last_packets_bitmap = 0;
4128 n->last_packets_bitmap <<= shift;
4129 n->last_sequence_number_received = snum;
4132 /* check timestamp */
4133 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
4134 if (GNUNET_TIME_absolute_get_duration (t).rel_value > MAX_MESSAGE_AGE.rel_value)
4136 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4138 ("Message received far too old (%llu ms). Content ignored.\n"),
4139 GNUNET_TIME_absolute_get_duration (t).rel_value);
4140 GNUNET_STATISTICS_set (stats,
4141 gettext_noop ("# bytes dropped (ancient message)"),
4147 /* process decrypted message(s) */
4148 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
4150 #if DEBUG_CORE_SET_QUOTA
4151 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4152 "Received %u b/s as new inbound limit for peer `%4s'\n",
4153 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
4154 GNUNET_i2s (&n->peer));
4156 n->bw_out_external_limit = pt->inbound_bw_limit;
4157 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
4158 n->bw_out_internal_limit);
4159 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
4161 GNUNET_TRANSPORT_set_quota (transport,
4165 GNUNET_TIME_UNIT_FOREVER_REL,
4168 n->last_activity = GNUNET_TIME_absolute_get ();
4169 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4170 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4172 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4175 GNUNET_STATISTICS_set (stats,
4176 gettext_noop ("# bytes of payload decrypted"),
4177 size - sizeof (struct EncryptedMessage),
4179 handle_peer_status_change (n);
4180 update_neighbour_performance (n, ats, ats_count);
4181 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
4183 &buf[sizeof (struct EncryptedMessage)],
4184 size - sizeof (struct EncryptedMessage),
4185 GNUNET_YES, GNUNET_NO))
4186 GNUNET_break_op (0);
4191 * Function called by the transport for each received message.
4193 * @param cls closure
4194 * @param peer (claimed) identity of the other peer
4195 * @param message the message
4196 * @param ats performance data
4197 * @param ats_count number of entries in ats (excluding 0-termination)
4200 handle_transport_receive (void *cls,
4201 const struct GNUNET_PeerIdentity *peer,
4202 const struct GNUNET_MessageHeader *message,
4203 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4206 struct Neighbour *n;
4207 struct GNUNET_TIME_Absolute now;
4214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4215 "Received message of type %u from `%4s', demultiplexing.\n",
4216 (unsigned int) ntohs (message->type),
4219 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4224 n = find_neighbour (peer);
4226 n = create_neighbour (peer);
4227 changed = GNUNET_NO;
4228 up = (n->status == PEER_STATE_KEY_CONFIRMED);
4229 type = ntohs (message->type);
4230 size = ntohs (message->size);
4233 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
4234 if (size != sizeof (struct SetKeyMessage))
4236 GNUNET_break_op (0);
4239 GNUNET_STATISTICS_update (stats,
4240 gettext_noop ("# session keys received"),
4244 (const struct SetKeyMessage *) message,
4247 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
4248 if (size < sizeof (struct EncryptedMessage) +
4249 sizeof (struct GNUNET_MessageHeader))
4251 GNUNET_break_op (0);
4254 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4255 (n->status != PEER_STATE_KEY_CONFIRMED))
4257 GNUNET_STATISTICS_update (stats,
4258 gettext_noop ("# failed to decrypt message (no session key)"),
4264 handle_encrypted_message (n,
4265 (const struct EncryptedMessage *) message,
4268 case GNUNET_MESSAGE_TYPE_CORE_PING:
4269 if (size != sizeof (struct PingMessage))
4271 GNUNET_break_op (0);
4274 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
4275 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4276 (n->status != PEER_STATE_KEY_CONFIRMED))
4279 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4280 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4281 "PING", GNUNET_i2s (&n->peer));
4283 GNUNET_free_non_null (n->pending_ping);
4284 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
4285 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
4288 handle_ping (n, (const struct PingMessage *) message,
4291 case GNUNET_MESSAGE_TYPE_CORE_PONG:
4292 if (size != sizeof (struct PongMessage))
4294 GNUNET_break_op (0);
4297 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
4298 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
4299 (n->status != PEER_STATE_KEY_CONFIRMED) )
4302 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4303 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4304 "PONG", GNUNET_i2s (&n->peer));
4306 GNUNET_free_non_null (n->pending_pong);
4307 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
4308 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
4311 handle_pong (n, (const struct PongMessage *) message,
4315 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4316 _("Unsupported message of type %u received.\n"),
4317 (unsigned int) type);
4320 if (n->status == PEER_STATE_KEY_CONFIRMED)
4322 now = GNUNET_TIME_absolute_get ();
4323 n->last_activity = now;
4324 changed = GNUNET_YES;
4327 GNUNET_STATISTICS_update (stats,
4328 gettext_noop ("# established sessions"),
4331 n->time_established = now;
4333 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4334 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4336 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4341 handle_peer_status_change (n);
4346 * Function that recalculates the bandwidth quota for the
4347 * given neighbour and transmits it to the transport service.
4349 * @param cls neighbour for the quota update
4353 neighbour_quota_update (void *cls,
4354 const struct GNUNET_SCHEDULER_TaskContext *tc)
4356 struct Neighbour *n = cls;
4357 struct GNUNET_BANDWIDTH_Value32NBO q_in;
4358 struct GNUNET_BANDWIDTH_Value32NBO q_out;
4359 struct GNUNET_BANDWIDTH_Value32NBO q_out_min;
4362 unsigned long long distributable;
4363 uint64_t need_per_peer;
4364 uint64_t need_per_second;
4365 unsigned int neighbour_count;
4368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4369 "Neighbour quota update calculation running for peer `%4s'\n",
4370 GNUNET_i2s (&n->peer));
4372 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
4373 /* calculate relative preference among all neighbours;
4374 divides by a bit more to avoid division by zero AND to
4375 account for possibility of new neighbours joining any time
4376 AND to convert to double... */
4377 neighbour_count = GNUNET_CONTAINER_multihashmap_size (neighbours);
4378 if (neighbour_count == 0)
4380 if (preference_sum == 0)
4382 pref_rel = 1.0 / (double) neighbour_count;
4386 pref_rel = n->current_preference / preference_sum;
4388 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
4389 GNUNET_TIME_UNIT_SECONDS);
4390 need_per_second = need_per_peer * neighbour_count;
4392 /* calculate inbound bandwidth per peer */
4394 if (bandwidth_target_in_bps > need_per_second)
4395 distributable = bandwidth_target_in_bps - need_per_second;
4396 share = distributable * pref_rel;
4397 if (share + need_per_peer > UINT32_MAX)
4398 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4400 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4402 /* calculate outbound bandwidth per peer */
4404 if (bandwidth_target_out_bps > need_per_second)
4405 distributable = bandwidth_target_out_bps - need_per_second;
4406 share = distributable * pref_rel;
4407 if (share + need_per_peer > UINT32_MAX)
4408 q_out = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4410 q_out = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4411 n->bw_out_internal_limit = q_out;
4413 q_out_min = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit, n->bw_out_internal_limit);
4414 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window, n->bw_out);
4416 /* check if we want to disconnect for good due to inactivity */
4417 if ( (GNUNET_TIME_absolute_get_duration (get_neighbour_timeout (n)).rel_value > 0) &&
4418 (GNUNET_TIME_absolute_get_duration (n->time_established).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) )
4421 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4422 "Forcing disconnect of `%4s' due to inactivity\n",
4423 GNUNET_i2s (&n->peer));
4425 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
4427 #if DEBUG_CORE_QUOTA
4428 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4429 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
4430 GNUNET_i2s (&n->peer),
4431 (unsigned int) ntohl (q_in.value__),
4432 bandwidth_target_out_bps,
4433 (unsigned int) ntohl (n->bw_in.value__),
4434 (unsigned int) ntohl (n->bw_out.value__),
4435 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
4437 if ((n->bw_in.value__ != q_in.value__) || (n->bw_out.value__ != q_out_min.value__))
4439 if (n->bw_in.value__ != q_in.value__)
4441 if (n->bw_out.value__ != q_out_min.value__)
4442 n->bw_out = q_out_min;
4443 if (GNUNET_YES == n->is_connected)
4444 GNUNET_TRANSPORT_set_quota (transport,
4448 GNUNET_TIME_UNIT_FOREVER_REL,
4450 handle_peer_status_change (n);
4452 schedule_quota_update (n);
4457 * Function called by transport to notify us that
4458 * a peer connected to us (on the network level).
4460 * @param cls closure
4461 * @param peer the peer that connected
4462 * @param ats performance data
4463 * @param ats_count number of entries in ats (excluding 0-termination)
4466 handle_transport_notify_connect (void *cls,
4467 const struct GNUNET_PeerIdentity *peer,
4468 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4471 struct Neighbour *n;
4473 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4478 n = find_neighbour (peer);
4481 if (GNUNET_YES == n->is_connected)
4483 /* duplicate connect notification!? */
4490 n = create_neighbour (peer);
4492 GNUNET_STATISTICS_update (stats,
4493 gettext_noop ("# peers connected (transport)"),
4496 n->is_connected = GNUNET_YES;
4497 update_neighbour_performance (n, ats, ats_count);
4498 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
4501 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
4505 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4506 "Received connection from `%4s'.\n",
4507 GNUNET_i2s (&n->peer));
4509 GNUNET_TRANSPORT_set_quota (transport,
4513 GNUNET_TIME_UNIT_FOREVER_REL,
4520 * Function called by transport telling us that a peer
4523 * @param cls closure
4524 * @param peer the peer that disconnected
4527 handle_transport_notify_disconnect (void *cls,
4528 const struct GNUNET_PeerIdentity *peer)
4530 struct DisconnectNotifyMessage cnm;
4531 struct Neighbour *n;
4532 struct ClientActiveRequest *car;
4533 struct GNUNET_TIME_Relative left;
4536 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4537 "Peer `%4s' disconnected from us; received notification from transport.\n",
4540 n = find_neighbour (peer);
4546 GNUNET_break (n->is_connected == GNUNET_YES);
4547 if (n->status == PEER_STATE_KEY_CONFIRMED)
4549 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
4550 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
4551 cnm.reserved = htonl (0);
4553 send_to_all_clients (&cnm.header, GNUNET_NO, GNUNET_CORE_OPTION_SEND_DISCONNECT);
4554 GNUNET_STATISTICS_update (stats,
4555 gettext_noop ("# established sessions"),
4560 /* On transport disconnect transport doesn't cancel requests, so must do so here. */
4563 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
4566 n->is_connected = GNUNET_NO;
4567 n->status = PEER_STATE_DOWN;
4568 while (NULL != (car = n->active_client_request_head))
4570 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
4571 n->active_client_request_tail,
4573 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
4574 &n->peer.hashPubKey,
4579 GNUNET_STATISTICS_update (stats,
4580 gettext_noop ("# peers connected (transport)"),
4583 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
4584 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
4585 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4586 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
4587 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
4589 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
4590 &consider_free_task,
4596 * Wrapper around 'free_neighbour'; helper for 'cleaning_task'.
4599 free_neighbour_helper (void *cls,
4600 const GNUNET_HashCode *key,
4603 struct Neighbour *n = value;
4611 * Last task run during shutdown. Disconnects us from
4615 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4620 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4621 "Core service shutting down.\n");
4623 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
4624 &free_neighbour_helper,
4626 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
4628 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), 0, GNUNET_NO);
4629 GNUNET_assert (transport != NULL);
4630 GNUNET_TRANSPORT_disconnect (transport);
4632 GNUNET_SERVER_notification_context_destroy (notifier);
4634 while (NULL != (c = clients))
4635 handle_client_disconnect (NULL, c->client_handle);
4636 if (my_private_key != NULL)
4637 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4639 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4640 if (peerinfo != NULL)
4641 GNUNET_PEERINFO_disconnect (peerinfo);
4643 GNUNET_SERVER_mst_destroy (mst);
4648 * Initiate core service.
4650 * @param cls closure
4651 * @param server the initialized server
4652 * @param c configuration to use
4656 struct GNUNET_SERVER_Handle *server,
4657 const struct GNUNET_CONFIGURATION_Handle *c)
4659 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4660 {&handle_client_init, NULL,
4661 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
4662 {&handle_client_iterate_peers, NULL,
4663 GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS,
4664 sizeof (struct GNUNET_MessageHeader)},
4665 {&handle_client_request_info, NULL,
4666 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
4667 sizeof (struct RequestInfoMessage)},
4668 {&handle_client_send_request, NULL,
4669 GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST,
4670 sizeof (struct SendMessageRequest)},
4671 {&handle_client_send, NULL,
4672 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
4673 {&handle_client_request_connect, NULL,
4674 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
4675 sizeof (struct ConnectMessage)},
4681 /* parse configuration */
4684 GNUNET_CONFIGURATION_get_value_number (c,
4687 &bandwidth_target_in_bps)) ||
4689 GNUNET_CONFIGURATION_get_value_number (c,
4692 &bandwidth_target_out_bps)) ||
4694 GNUNET_CONFIGURATION_get_value_filename (c,
4696 "HOSTKEY", &keyfile)))
4698 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4700 ("Core service is lacking key configuration settings. Exiting.\n"));
4701 GNUNET_SCHEDULER_shutdown ();
4704 peerinfo = GNUNET_PEERINFO_connect (cfg);
4705 if (NULL == peerinfo)
4707 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4708 _("Could not access PEERINFO service. Exiting.\n"));
4709 GNUNET_SCHEDULER_shutdown ();
4710 GNUNET_free (keyfile);
4713 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4714 GNUNET_free (keyfile);
4715 if (my_private_key == NULL)
4717 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4718 _("Core service could not access hostkey. Exiting.\n"));
4719 GNUNET_PEERINFO_disconnect (peerinfo);
4720 GNUNET_SCHEDULER_shutdown ();
4723 neighbours = GNUNET_CONTAINER_multihashmap_create (128);
4724 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4725 GNUNET_CRYPTO_hash (&my_public_key,
4726 sizeof (my_public_key), &my_identity.hashPubKey);
4727 self.public_key = &my_public_key;
4728 self.peer = my_identity;
4729 self.last_activity = GNUNET_TIME_UNIT_FOREVER_ABS;
4730 self.status = PEER_STATE_KEY_CONFIRMED;
4731 self.is_connected = GNUNET_YES;
4732 /* setup notification */
4733 notifier = GNUNET_SERVER_notification_context_create (server,
4735 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
4736 /* setup transport connection */
4737 transport = GNUNET_TRANSPORT_connect (cfg,
4740 &handle_transport_receive,
4741 &handle_transport_notify_connect,
4742 &handle_transport_notify_disconnect);
4743 GNUNET_assert (NULL != transport);
4744 stats = GNUNET_STATISTICS_create ("core", cfg);
4746 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded CORE_SEND requests"), 0, GNUNET_NO);
4747 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 0, GNUNET_NO);
4749 mst = GNUNET_SERVER_mst_create (&deliver_message,
4751 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
4752 &cleaning_task, NULL);
4753 /* process client requests */
4754 GNUNET_SERVER_add_handlers (server, handlers);
4755 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4756 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
4762 * The main function for the transport service.
4764 * @param argc number of arguments from the command line
4765 * @param argv command line arguments
4766 * @return 0 ok, 1 on error
4769 main (int argc, char *const *argv)
4771 return (GNUNET_OK ==
4772 GNUNET_SERVICE_run (argc,
4775 GNUNET_SERVICE_OPTION_NONE,
4776 &run, NULL)) ? 0 : 1;
4779 /* end of gnunet-service-core.c */