2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
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) )
1115 return; /* no pending requests */
1119 car = n->active_client_request_head;
1123 #if DEBUG_CORE_CLIENT
1124 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1125 "Permitting client transmission request to `%s'\n",
1126 GNUNET_i2s (&n->peer));
1129 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1130 n->active_client_request_tail,
1132 GNUNET_CONTAINER_multihashmap_remove (c->requests,
1133 &n->peer.hashPubKey,
1135 smr.header.size = htons (sizeof (struct SendMessageReady));
1136 smr.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_READY);
1137 smr.size = htons (car->msize);
1138 smr.smr_id = car->smr_id;
1140 send_to_client (c, &smr.header, GNUNET_NO);
1146 * Handle CORE_SEND_REQUEST message.
1149 handle_client_send_request (void *cls,
1150 struct GNUNET_SERVER_Client *client,
1151 const struct GNUNET_MessageHeader *message)
1153 const struct SendMessageRequest *req;
1154 struct Neighbour *n;
1156 struct ClientActiveRequest *car;
1158 req = (const struct SendMessageRequest*) message;
1159 if (0 == memcmp (&req->peer,
1161 sizeof (struct GNUNET_PeerIdentity)))
1164 n = find_neighbour (&req->peer);
1166 (GNUNET_YES != n->is_connected) ||
1167 (n->status != PEER_STATE_KEY_CONFIRMED) )
1169 /* neighbour must have disconnected since request was issued,
1170 ignore (client will realize it once it processes the
1171 disconnect notification) */
1172 #if DEBUG_CORE_CLIENT
1173 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1174 "Dropped client request for transmission (am disconnected)\n");
1176 GNUNET_STATISTICS_update (stats,
1177 gettext_noop ("# send requests dropped (disconnected)"),
1180 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1184 while ( (c != NULL) &&
1185 (c->client_handle != client) )
1189 /* client did not send INIT first! */
1191 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1194 if (c->requests == NULL)
1195 c->requests = GNUNET_CONTAINER_multihashmap_create (16);
1196 #if DEBUG_CORE_CLIENT
1197 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1198 "Received client transmission request. queueing\n");
1200 car = GNUNET_CONTAINER_multihashmap_get (c->requests,
1201 &req->peer.hashPubKey);
1204 /* create new entry */
1205 car = GNUNET_malloc (sizeof (struct ClientActiveRequest));
1206 GNUNET_assert (GNUNET_OK ==
1207 GNUNET_CONTAINER_multihashmap_put (c->requests,
1208 &req->peer.hashPubKey,
1210 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
1211 GNUNET_CONTAINER_DLL_insert (n->active_client_request_head,
1212 n->active_client_request_tail,
1216 car->deadline = GNUNET_TIME_absolute_ntoh (req->deadline);
1217 car->priority = ntohl (req->priority);
1218 car->queue_size = ntohl (req->queue_size);
1219 car->msize = ntohs (req->size);
1220 car->smr_id = req->smr_id;
1221 schedule_peer_messages (n);
1222 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1227 * Notify client about an existing connection to one of our neighbours.
1230 notify_client_about_neighbour (void *cls,
1231 const GNUNET_HashCode *key,
1234 struct Client *c = cls;
1235 struct Neighbour *n = value;
1237 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1238 struct GNUNET_TRANSPORT_ATS_Information *ats;
1239 struct ConnectNotifyMessage *cnm;
1241 size = sizeof (struct ConnectNotifyMessage) +
1242 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1243 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1246 /* recovery strategy: throw away performance data */
1247 GNUNET_array_grow (n->ats,
1250 size = sizeof (struct ConnectNotifyMessage) +
1251 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1253 cnm = (struct ConnectNotifyMessage*) buf;
1254 cnm->header.size = htons (size);
1255 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1256 cnm->ats_count = htonl (n->ats_count);
1260 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * n->ats_count);
1261 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1262 ats[n->ats_count].value = htonl (0);
1263 if (n->status == PEER_STATE_KEY_CONFIRMED)
1265 #if DEBUG_CORE_CLIENT
1266 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1267 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
1269 cnm->peer = n->peer;
1270 send_to_client (c, &cnm->header, GNUNET_NO);
1278 * Handle CORE_INIT request.
1281 handle_client_init (void *cls,
1282 struct GNUNET_SERVER_Client *client,
1283 const struct GNUNET_MessageHeader *message)
1285 const struct InitMessage *im;
1286 struct InitReplyMessage irm;
1289 const uint16_t *types;
1293 #if DEBUG_CORE_CLIENT
1294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1295 "Client connecting to core service with `%s' message\n",
1298 /* check that we don't have an entry already */
1302 if (client == c->client_handle)
1305 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1310 msize = ntohs (message->size);
1311 if (msize < sizeof (struct InitMessage))
1314 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1317 GNUNET_SERVER_notification_context_add (notifier, client);
1318 im = (const struct InitMessage *) message;
1319 types = (const uint16_t *) &im[1];
1320 msize -= sizeof (struct InitMessage);
1321 c = GNUNET_malloc (sizeof (struct Client) + msize);
1322 c->client_handle = client;
1325 c->tcnt = msize / sizeof (uint16_t);
1326 c->types = (const uint16_t *) &c[1];
1327 wtypes = (uint16_t *) &c[1];
1328 for (i=0;i<c->tcnt;i++)
1329 wtypes[i] = ntohs (types[i]);
1330 c->options = ntohl (im->options);
1331 #if DEBUG_CORE_CLIENT
1332 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1333 "Client %p is interested in %u message types\n",
1335 (unsigned int) c->tcnt);
1337 /* send init reply message */
1338 irm.header.size = htons (sizeof (struct InitReplyMessage));
1339 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
1340 irm.reserved = htonl (0);
1341 memcpy (&irm.publicKey,
1343 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1344 #if DEBUG_CORE_CLIENT
1345 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1346 "Sending `%s' message to client.\n", "INIT_REPLY");
1348 send_to_client (c, &irm.header, GNUNET_NO);
1349 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
1351 /* notify new client about existing neighbours */
1352 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
1353 ¬ify_client_about_neighbour,
1356 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1361 * Free client request records.
1364 * @param key identity of peer for which this is an active request
1365 * @param value the 'struct ClientActiveRequest' to free
1366 * @return GNUNET_YES (continue iteration)
1369 destroy_active_client_request (void *cls,
1370 const GNUNET_HashCode *key,
1373 struct ClientActiveRequest *car = value;
1374 struct Neighbour *n;
1375 struct GNUNET_PeerIdentity peer;
1377 peer.hashPubKey = *key;
1378 n = find_neighbour (&peer);
1379 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1380 n->active_client_request_tail,
1388 * A client disconnected, clean up.
1390 * @param cls closure
1391 * @param client identification of the client
1394 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
1397 struct Client *prev;
1401 #if DEBUG_CORE_CLIENT
1402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1403 "Client %p has disconnected from core service.\n",
1410 if (client == pos->client_handle)
1417 /* client never sent INIT */
1421 clients = pos->next;
1423 prev->next = pos->next;
1424 if (pos->requests != NULL)
1426 GNUNET_CONTAINER_multihashmap_iterate (pos->requests,
1427 &destroy_active_client_request,
1429 GNUNET_CONTAINER_multihashmap_destroy (pos->requests);
1436 * Helper function for handle_client_iterate_peers.
1439 queue_connect_message (void *cls,
1440 const GNUNET_HashCode *key,
1443 struct GNUNET_SERVER_TransmitContext *tc = cls;
1444 struct Neighbour *n = value;
1445 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1446 struct GNUNET_TRANSPORT_ATS_Information *ats;
1448 struct ConnectNotifyMessage *cnm;
1450 cnm = (struct ConnectNotifyMessage*) buf;
1451 if (n->status != PEER_STATE_KEY_CONFIRMED)
1453 size = sizeof (struct ConnectNotifyMessage) +
1454 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1455 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
1458 /* recovery strategy: throw away performance data */
1459 GNUNET_array_grow (n->ats,
1462 size = sizeof (struct PeerStatusNotifyMessage) +
1463 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
1465 cnm = (struct ConnectNotifyMessage*) buf;
1466 cnm->header.size = htons (size);
1467 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
1468 cnm->ats_count = htonl (n->ats_count);
1472 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
1473 ats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
1474 ats[n->ats_count].value = htonl (0);
1475 #if DEBUG_CORE_CLIENT
1476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1477 "Sending `%s' message to client.\n",
1480 cnm->peer = n->peer;
1481 GNUNET_SERVER_transmit_context_append_message (tc,
1488 * Handle CORE_ITERATE_PEERS request.
1491 * @param client client sending the iteration request
1492 * @param message iteration request message
1495 handle_client_iterate_peers (void *cls,
1496 struct GNUNET_SERVER_Client *client,
1497 const struct GNUNET_MessageHeader *message)
1500 struct GNUNET_MessageHeader done_msg;
1501 struct GNUNET_SERVER_TransmitContext *tc;
1503 /* notify new client about existing neighbours */
1504 tc = GNUNET_SERVER_transmit_context_create (client);
1505 GNUNET_CONTAINER_multihashmap_iterate (neighbours, &queue_connect_message, tc);
1506 done_msg.size = htons (sizeof (struct GNUNET_MessageHeader));
1507 done_msg.type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END);
1508 GNUNET_SERVER_transmit_context_append_message (tc, &done_msg);
1509 GNUNET_SERVER_transmit_context_run (tc,
1510 GNUNET_TIME_UNIT_FOREVER_REL);
1515 * Handle REQUEST_INFO request.
1518 handle_client_request_info (void *cls,
1519 struct GNUNET_SERVER_Client *client,
1520 const struct GNUNET_MessageHeader *message)
1522 const struct RequestInfoMessage *rcm;
1524 struct Neighbour *n;
1525 struct ConfigurationInfoMessage cim;
1526 int32_t want_reserv;
1528 unsigned long long old_preference;
1530 #if DEBUG_CORE_CLIENT
1531 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1532 "Core service receives `%s' request.\n", "REQUEST_INFO");
1537 if (client == pos->client_handle)
1544 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1548 rcm = (const struct RequestInfoMessage *) message;
1549 n = find_neighbour (&rcm->peer);
1550 memset (&cim, 0, sizeof (cim));
1553 want_reserv = ntohl (rcm->reserve_inbound);
1554 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1556 n->bw_out_internal_limit = rcm->limit_outbound;
1557 if (n->bw_out.value__ != GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1558 n->bw_out_external_limit).value__)
1560 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1561 n->bw_out_external_limit);
1562 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1564 GNUNET_TRANSPORT_set_quota (transport,
1568 GNUNET_TIME_UNIT_FOREVER_REL,
1570 handle_peer_status_change (n);
1573 if (want_reserv < 0)
1575 got_reserv = want_reserv;
1577 else if (want_reserv > 0)
1579 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1580 want_reserv).rel_value == 0)
1581 got_reserv = want_reserv;
1583 got_reserv = 0; /* all or nothing */
1587 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1589 old_preference = n->current_preference;
1590 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1591 if (old_preference > n->current_preference)
1593 /* overflow; cap at maximum value */
1594 n->current_preference = ULLONG_MAX;
1596 update_preference_sum (n->current_preference - old_preference);
1597 #if DEBUG_CORE_QUOTA
1598 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1599 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1601 GNUNET_i2s (&rcm->peer),
1604 cim.reserved_amount = htonl (got_reserv);
1605 cim.rim_id = rcm->rim_id;
1606 cim.bw_out = n->bw_out;
1607 cim.preference = n->current_preference;
1609 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1610 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1611 cim.peer = rcm->peer;
1612 #if DEBUG_CORE_CLIENT
1613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1614 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1616 send_to_client (pos, &cim.header, GNUNET_NO);
1617 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1622 * Free the given entry for the neighbour (it has
1623 * already been removed from the list at this point).
1625 * @param n neighbour to free
1628 free_neighbour (struct Neighbour *n)
1630 struct MessageEntry *m;
1631 struct ClientActiveRequest *car;
1634 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1635 "Destroying neighbour entry for peer `%4s'\n",
1636 GNUNET_i2s (&n->peer));
1638 if (n->pitr != NULL)
1640 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1645 GNUNET_free (n->skm);
1648 while (NULL != (m = n->messages))
1650 n->messages = m->next;
1653 while (NULL != (m = n->encrypted_head))
1655 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1660 while (NULL != (car = n->active_client_request_head))
1662 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
1663 n->active_client_request_tail,
1665 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
1666 &n->peer.hashPubKey,
1672 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1675 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1676 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
1677 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1678 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
1679 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1680 GNUNET_SCHEDULER_cancel (n->quota_update_task);
1681 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1682 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1683 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1684 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
1685 if (n->status == PEER_STATE_KEY_CONFIRMED)
1686 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), -1, GNUNET_NO);
1687 GNUNET_array_grow (n->ats, n->ats_count, 0);
1688 GNUNET_free_non_null (n->public_key);
1689 GNUNET_free_non_null (n->pending_ping);
1690 GNUNET_free_non_null (n->pending_pong);
1696 * Check if we have encrypted messages for the specified neighbour
1697 * pending, and if so, check with the transport about sending them
1700 * @param n neighbour to check.
1702 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1706 * Encrypt size bytes from in and write the result to out. Use the
1707 * key for outbound traffic of the given neighbour.
1709 * @param n neighbour we are sending to
1710 * @param iv initialization vector to use
1711 * @param in ciphertext
1712 * @param out plaintext
1713 * @param size size of in/out
1714 * @return GNUNET_OK on success
1717 do_encrypt (struct Neighbour *n,
1718 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
1719 const void *in, void *out, size_t size)
1721 if (size != (uint16_t) size)
1726 GNUNET_assert (size ==
1727 GNUNET_CRYPTO_aes_encrypt (in,
1731 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1734 "Encrypted %u bytes for `%4s' using key %u, IV %u\n",
1735 (unsigned int) size,
1736 GNUNET_i2s (&n->peer),
1737 (unsigned int) n->encrypt_key.crc32,
1738 GNUNET_CRYPTO_crc32_n (iv, sizeof(iv)));
1745 * Consider freeing the given neighbour since we may not need
1746 * to keep it around anymore.
1748 * @param n neighbour to consider discarding
1751 consider_free_neighbour (struct Neighbour *n);
1755 * Task triggered when a neighbour entry is about to time out
1756 * (and we should prevent this by sending a PING).
1758 * @param cls the 'struct Neighbour'
1759 * @param tc scheduler context (not used)
1762 send_keep_alive (void *cls,
1763 const struct GNUNET_SCHEDULER_TaskContext *tc)
1765 struct Neighbour *n = cls;
1766 struct GNUNET_TIME_Relative retry;
1767 struct GNUNET_TIME_Relative left;
1768 struct MessageEntry *me;
1769 struct PingMessage pp;
1770 struct PingMessage *pm;
1771 struct GNUNET_CRYPTO_AesInitializationVector iv;
1773 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1775 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1776 sizeof (struct PingMessage));
1777 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1778 me->priority = PING_PRIORITY;
1779 me->size = sizeof (struct PingMessage);
1780 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1784 pm = (struct PingMessage *) &me[1];
1785 pm->header.size = htons (sizeof (struct PingMessage));
1786 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1787 pm->iv_seed = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1789 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
1790 pp.challenge = n->ping_challenge;
1791 pp.target = n->peer;
1793 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1794 "Encrypting `%s' message with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
1796 (unsigned int) n->ping_challenge,
1797 GNUNET_i2s (&n->peer),
1798 (unsigned int) n->encrypt_key.crc32,
1799 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
1806 sizeof (struct PingMessage) -
1807 ((void *) &pm->target - (void *) pm));
1808 process_encrypted_neighbour_queue (n);
1809 /* reschedule PING job */
1810 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1811 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1812 MIN_PING_FREQUENCY);
1814 = GNUNET_SCHEDULER_add_delayed (retry,
1822 * Task triggered when a neighbour entry might have gotten stale.
1824 * @param cls the 'struct Neighbour'
1825 * @param tc scheduler context (not used)
1828 consider_free_task (void *cls,
1829 const struct GNUNET_SCHEDULER_TaskContext *tc)
1831 struct Neighbour *n = cls;
1833 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1834 consider_free_neighbour (n);
1839 * Consider freeing the given neighbour since we may not need
1840 * to keep it around anymore.
1842 * @param n neighbour to consider discarding
1845 consider_free_neighbour (struct Neighbour *n)
1847 struct GNUNET_TIME_Relative left;
1849 if ( (n->th != NULL) ||
1850 (n->pitr != NULL) ||
1851 (GNUNET_YES == n->is_connected) )
1852 return; /* no chance */
1854 left = GNUNET_TIME_absolute_get_remaining (get_neighbour_timeout (n));
1855 if (left.rel_value > 0)
1857 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1858 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
1859 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (left,
1860 &consider_free_task,
1864 /* actually free the neighbour... */
1865 GNUNET_assert (GNUNET_OK ==
1866 GNUNET_CONTAINER_multihashmap_remove (neighbours,
1867 &n->peer.hashPubKey,
1869 GNUNET_STATISTICS_set (stats,
1870 gettext_noop ("# neighbour entries allocated"),
1871 GNUNET_CONTAINER_multihashmap_size (neighbours),
1878 * Function called when the transport service is ready to
1879 * receive an encrypted message for the respective peer
1881 * @param cls neighbour to use message from
1882 * @param size number of bytes we can transmit
1883 * @param buf where to copy the message
1884 * @return number of bytes transmitted
1887 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1889 struct Neighbour *n = cls;
1890 struct MessageEntry *m;
1895 m = n->encrypted_head;
1899 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1900 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1901 GNUNET_i2s (&n->peer));
1905 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1912 GNUNET_assert (size >= m->size);
1913 memcpy (cbuf, &m[1], m->size);
1915 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1918 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1919 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1920 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1922 GNUNET_i2s (&n->peer));
1924 process_encrypted_neighbour_queue (n);
1929 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1930 "Transmission of message of type %u and size %u failed\n",
1931 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1932 (unsigned int) m->size);
1936 consider_free_neighbour (n);
1942 * Check if we have plaintext messages for the specified neighbour
1943 * pending, and if so, consider batching and encrypting them (and
1944 * then trigger processing of the encrypted queue if needed).
1946 * @param n neighbour to check.
1948 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1952 * Check if we have encrypted messages for the specified neighbour
1953 * pending, and if so, check with the transport about sending them
1956 * @param n neighbour to check.
1959 process_encrypted_neighbour_queue (struct Neighbour *n)
1961 struct MessageEntry *m;
1964 return; /* request already pending */
1965 m = n->encrypted_head;
1968 /* encrypted queue empty, try plaintext instead */
1969 process_plaintext_neighbour_queue (n);
1973 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1974 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1975 (unsigned int) m->size,
1976 GNUNET_i2s (&n->peer),
1977 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).rel_value);
1980 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1983 GNUNET_TIME_absolute_get_remaining
1985 ¬ify_encrypted_transmit_ready,
1989 /* message request too large or duplicate request */
1991 /* discard encrypted message */
1992 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1996 process_encrypted_neighbour_queue (n);
2002 * Decrypt size bytes from in and write the result to out. Use the
2003 * key for inbound traffic of the given neighbour. This function does
2004 * NOT do any integrity-checks on the result.
2006 * @param n neighbour we are receiving from
2007 * @param iv initialization vector to use
2008 * @param in ciphertext
2009 * @param out plaintext
2010 * @param size size of in/out
2011 * @return GNUNET_OK on success
2014 do_decrypt (struct Neighbour *n,
2015 const struct GNUNET_CRYPTO_AesInitializationVector * iv,
2016 const void *in, void *out, size_t size)
2018 if (size != (uint16_t) size)
2023 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
2024 (n->status != PEER_STATE_KEY_CONFIRMED))
2026 GNUNET_break_op (0);
2027 return GNUNET_SYSERR;
2030 GNUNET_CRYPTO_aes_decrypt (in,
2037 return GNUNET_SYSERR;
2039 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes decrypted"), size, GNUNET_NO);
2041 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2042 "Decrypted %u bytes from `%4s' using key %u, IV %u\n",
2043 (unsigned int) size,
2044 GNUNET_i2s (&n->peer),
2045 (unsigned int) n->decrypt_key.crc32,
2046 GNUNET_CRYPTO_crc32_n (iv, sizeof(*iv)));
2053 * Select messages for transmission. This heuristic uses a combination
2054 * of earliest deadline first (EDF) scheduling (with bounded horizon)
2055 * and priority-based discard (in case no feasible schedule exist) and
2056 * speculative optimization (defer any kind of transmission until
2057 * we either create a batch of significant size, 25% of max, or until
2058 * we are close to a deadline). Furthermore, when scheduling the
2059 * heuristic also packs as many messages into the batch as possible,
2060 * starting with those with the earliest deadline. Yes, this is fun.
2062 * @param n neighbour to select messages from
2063 * @param size number of bytes to select for transmission
2064 * @param retry_time set to the time when we should try again
2065 * (only valid if this function returns zero)
2066 * @return number of bytes selected, or 0 if we decided to
2067 * defer scheduling overall; in that case, retry_time is set.
2070 select_messages (struct Neighbour *n,
2071 size_t size, struct GNUNET_TIME_Relative *retry_time)
2073 struct MessageEntry *pos;
2074 struct MessageEntry *min;
2075 struct MessageEntry *last;
2076 unsigned int min_prio;
2077 struct GNUNET_TIME_Absolute t;
2078 struct GNUNET_TIME_Absolute now;
2079 struct GNUNET_TIME_Relative delta;
2081 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
2084 unsigned int queue_size;
2085 int discard_low_prio;
2087 GNUNET_assert (NULL != n->messages);
2088 now = GNUNET_TIME_absolute_get ();
2089 /* last entry in linked list of messages processed */
2091 /* should we remove the entry with the lowest
2092 priority from consideration for scheduling at the
2103 discard_low_prio = GNUNET_YES;
2104 while (GNUNET_YES == discard_low_prio)
2107 min_prio = UINT_MAX;
2108 discard_low_prio = GNUNET_NO;
2109 /* calculate number of bytes available for transmission at time "t" */
2110 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
2112 /* how many bytes have we (hypothetically) scheduled so far */
2114 /* maximum time we can wait before transmitting anything
2115 and still make all of our deadlines */
2116 slack = GNUNET_TIME_UNIT_FOREVER_REL;
2118 /* note that we use "*2" here because we want to look
2119 a bit further into the future; much more makes no
2120 sense since new message might be scheduled in the
2122 while ((pos != NULL) && (off < size * 2))
2124 if (pos->do_transmit == GNUNET_YES)
2126 /* already removed from consideration */
2130 if (discard_low_prio == GNUNET_NO)
2132 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
2133 if (delta.rel_value > 0)
2135 // FIXME: HUH? Check!
2137 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
2140 if (avail < pos->size)
2142 // FIXME: HUH? Check!
2143 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
2148 /* update slack, considering both its absolute deadline
2149 and relative deadlines caused by other messages
2150 with their respective load */
2151 slack = GNUNET_TIME_relative_min (slack,
2152 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
2154 if (pos->deadline.abs_value <= now.abs_value)
2157 slack = GNUNET_TIME_UNIT_ZERO;
2159 else if (GNUNET_YES == pos->got_slack)
2161 /* should be soon now! */
2162 slack = GNUNET_TIME_relative_min (slack,
2163 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
2168 GNUNET_TIME_relative_min (slack,
2169 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
2170 pos->got_slack = GNUNET_YES;
2171 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
2172 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
2177 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
2178 if (pos->priority <= min_prio)
2180 /* update min for discard */
2181 min_prio = pos->priority;
2186 if (discard_low_prio)
2188 GNUNET_assert (min != NULL);
2189 /* remove lowest-priority entry from consideration */
2190 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
2194 /* guard against sending "tiny" messages with large headers without
2196 if ( (slack.rel_value > GNUNET_CONSTANTS_MAX_CORK_DELAY.rel_value) &&
2198 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
2200 /* less than 25% of message would be filled with deadlines still
2201 being met if we delay by one second or more; so just wait for
2202 more data; but do not wait longer than 1s (since we don't want
2203 to delay messages for a really long time either). */
2204 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
2205 /* reset do_transmit values for next time */
2208 pos->do_transmit = GNUNET_NO;
2211 GNUNET_STATISTICS_update (stats,
2212 gettext_noop ("# transmissions delayed due to corking"),
2215 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2216 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
2217 (unsigned long long) retry_time->rel_value,
2219 (unsigned int) size);
2223 /* select marked messages (up to size) for transmission */
2228 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
2230 pos->do_transmit = GNUNET_YES; /* mark for transmission */
2234 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2235 "Selecting message of size %u for transmission\n",
2236 (unsigned int) pos->size);
2242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2243 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
2244 (unsigned int) pos->size,
2247 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
2252 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2253 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
2254 (unsigned long long) off, (unsigned long long) tsize,
2255 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
2256 GNUNET_i2s (&n->peer));
2263 * Batch multiple messages into a larger buffer.
2265 * @param n neighbour to take messages from
2266 * @param buf target buffer
2267 * @param size size of buf
2268 * @param deadline set to transmission deadline for the result
2269 * @param retry_time set to the time when we should try again
2270 * (only valid if this function returns zero)
2271 * @param priority set to the priority of the batch
2272 * @return number of bytes written to buf (can be zero)
2275 batch_message (struct Neighbour *n,
2278 struct GNUNET_TIME_Absolute *deadline,
2279 struct GNUNET_TIME_Relative *retry_time,
2280 unsigned int *priority)
2282 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
2283 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
2284 struct MessageEntry *pos;
2285 struct MessageEntry *prev;
2286 struct MessageEntry *next;
2291 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2292 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
2293 if (0 == select_messages (n, size, retry_time))
2296 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2297 "No messages selected, will try again in %llu ms\n",
2298 retry_time->rel_value);
2302 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
2303 ntm->ats_count = htonl (0);
2304 ntm->ats.type = htonl (0);
2305 ntm->ats.value = htonl (0);
2306 ntm->peer = n->peer;
2309 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
2312 if (GNUNET_YES == pos->do_transmit)
2314 GNUNET_assert (pos->size <= size);
2315 /* do notifications */
2316 /* FIXME: track if we have *any* client that wants
2317 full notifications and only do this if that is
2319 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
2321 memcpy (&ntm[1], &pos[1], pos->size);
2322 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2323 sizeof (struct GNUNET_MessageHeader));
2324 send_to_all_clients (&ntm->header,
2326 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
2330 /* message too large for 'full' notifications, we do at
2331 least the 'hdr' type */
2334 sizeof (struct GNUNET_MessageHeader));
2336 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
2338 send_to_all_clients (&ntm->header,
2340 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
2342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2343 "Encrypting %u bytes with message of type %u and size %u\n",
2345 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
2346 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
2348 /* copy for encrypted transmission */
2349 memcpy (&buf[ret], &pos[1], pos->size);
2352 *priority += pos->priority;
2354 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2355 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
2356 (unsigned int) pos->size,
2357 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).rel_value);
2359 deadline->abs_value = GNUNET_MIN (deadline->abs_value, pos->deadline.abs_value);
2373 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2374 "Deadline for message batch is %llu ms\n",
2375 GNUNET_TIME_absolute_get_remaining (*deadline).rel_value);
2382 * Remove messages with deadlines that have long expired from
2385 * @param n neighbour to inspect
2388 discard_expired_messages (struct Neighbour *n)
2390 struct MessageEntry *prev;
2391 struct MessageEntry *next;
2392 struct MessageEntry *pos;
2393 struct GNUNET_TIME_Absolute now;
2394 struct GNUNET_TIME_Relative delta;
2398 now = GNUNET_TIME_absolute_get ();
2404 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
2405 if (delta.rel_value > PAST_EXPIRATION_DISCARD_TIME.rel_value)
2408 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2409 "Message is %llu ms past due, discarding.\n",
2416 GNUNET_STATISTICS_update (stats,
2417 gettext_noop ("# messages discarded (expired prior to transmission)"),
2427 if (GNUNET_YES == disc)
2428 schedule_peer_messages (n);
2433 * Signature of the main function of a task.
2435 * @param cls closure
2436 * @param tc context information (why was this task triggered now)
2439 retry_plaintext_processing (void *cls,
2440 const struct GNUNET_SCHEDULER_TaskContext *tc)
2442 struct Neighbour *n = cls;
2444 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2445 process_plaintext_neighbour_queue (n);
2450 * Send our key (and encrypted PING) to the other peer.
2452 * @param n the other peer
2454 static void send_key (struct Neighbour *n);
2457 * Task that will retry "send_key" if our previous attempt failed
2461 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2463 struct Neighbour *n = cls;
2466 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2467 "Retrying key transmission to `%4s'\n",
2468 GNUNET_i2s (&n->peer));
2470 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2471 n->set_key_retry_frequency =
2472 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
2478 * Check if we have plaintext messages for the specified neighbour
2479 * pending, and if so, consider batching and encrypting them (and
2480 * then trigger processing of the encrypted queue if needed).
2482 * @param n neighbour to check.
2485 process_plaintext_neighbour_queue (struct Neighbour *n)
2487 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
2489 struct EncryptedMessage *em; /* encrypted message */
2490 struct EncryptedMessage *ph; /* plaintext header */
2491 struct MessageEntry *me;
2492 unsigned int priority;
2493 struct GNUNET_TIME_Absolute deadline;
2494 struct GNUNET_TIME_Relative retry_time;
2495 struct GNUNET_CRYPTO_AesInitializationVector iv;
2496 struct GNUNET_CRYPTO_AuthKey auth_key;
2498 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
2500 GNUNET_SCHEDULER_cancel (n->retry_plaintext_task);
2501 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
2505 case PEER_STATE_DOWN:
2508 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2509 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2510 GNUNET_i2s(&n->peer));
2513 case PEER_STATE_KEY_SENT:
2514 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2515 n->retry_set_key_task
2516 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2517 &set_key_retry_task, n);
2519 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2520 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2521 GNUNET_i2s(&n->peer));
2524 case PEER_STATE_KEY_RECEIVED:
2525 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
2526 n->retry_set_key_task
2527 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
2528 &set_key_retry_task, n);
2530 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2531 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2532 GNUNET_i2s(&n->peer));
2535 case PEER_STATE_KEY_CONFIRMED:
2536 /* ready to continue */
2539 discard_expired_messages (n);
2540 if (n->messages == NULL)
2543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2544 "Plaintext message queue for `%4s' is empty.\n",
2545 GNUNET_i2s(&n->peer));
2547 return; /* no pending messages */
2549 if (n->encrypted_head != NULL)
2552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2553 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2554 GNUNET_i2s(&n->peer));
2556 return; /* wait for messages already encrypted to be
2559 ph = (struct EncryptedMessage *) pbuf;
2560 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2562 used = sizeof (struct EncryptedMessage);
2563 used += batch_message (n,
2565 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2566 &deadline, &retry_time, &priority);
2567 if (used == sizeof (struct EncryptedMessage))
2570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2571 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2572 GNUNET_i2s(&n->peer));
2574 /* no messages selected for sending, try again later... */
2575 n->retry_plaintext_task =
2576 GNUNET_SCHEDULER_add_delayed (retry_time,
2577 &retry_plaintext_processing, n);
2580 #if DEBUG_CORE_QUOTA
2581 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2582 "Sending %u b/s as new limit to peer `%4s'\n",
2583 (unsigned int) ntohl (n->bw_in.value__),
2584 GNUNET_i2s (&n->peer));
2586 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX));
2587 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2588 ph->inbound_bw_limit = n->bw_in;
2589 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2591 /* setup encryption message header */
2592 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2593 me->deadline = deadline;
2594 me->priority = priority;
2596 em = (struct EncryptedMessage *) &me[1];
2597 em->header.size = htons (used);
2598 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2599 em->iv_seed = ph->iv_seed;
2600 derive_iv (&iv, &n->encrypt_key, ph->iv_seed, &n->peer);
2603 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2604 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2605 (unsigned int) used - ENCRYPTED_HEADER_SIZE,
2606 GNUNET_i2s(&n->peer),
2607 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).rel_value);
2609 GNUNET_assert (GNUNET_OK ==
2612 &ph->sequence_number,
2613 &em->sequence_number, used - ENCRYPTED_HEADER_SIZE));
2614 derive_auth_key (&auth_key,
2617 n->encrypt_key_created);
2618 GNUNET_CRYPTO_hmac (&auth_key,
2619 &em->sequence_number,
2620 used - ENCRYPTED_HEADER_SIZE,
2623 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2624 "Authenticated %u bytes of ciphertext %u: `%s'\n",
2625 used - ENCRYPTED_HEADER_SIZE,
2626 GNUNET_CRYPTO_crc32_n (&em->sequence_number,
2627 used - ENCRYPTED_HEADER_SIZE),
2628 GNUNET_h2s (&em->hmac));
2630 /* append to transmission list */
2631 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2635 process_encrypted_neighbour_queue (n);
2636 schedule_peer_messages (n);
2641 * Function that recalculates the bandwidth quota for the
2642 * given neighbour and transmits it to the transport service.
2644 * @param cls neighbour for the quota update
2648 neighbour_quota_update (void *cls,
2649 const struct GNUNET_SCHEDULER_TaskContext *tc);
2653 * Schedule the task that will recalculate the bandwidth
2654 * quota for this peer (and possibly force a disconnect of
2655 * idle peers by calculating a bandwidth of zero).
2658 schedule_quota_update (struct Neighbour *n)
2660 GNUNET_assert (n->quota_update_task ==
2661 GNUNET_SCHEDULER_NO_TASK);
2662 n->quota_update_task
2663 = GNUNET_SCHEDULER_add_delayed (QUOTA_UPDATE_FREQUENCY,
2664 &neighbour_quota_update,
2670 * Initialize a new 'struct Neighbour'.
2672 * @param pid ID of the new neighbour
2673 * @return handle for the new neighbour
2675 static struct Neighbour *
2676 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2678 struct Neighbour *n;
2679 struct GNUNET_TIME_Absolute now;
2682 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2683 "Creating neighbour entry for peer `%4s'\n",
2686 n = GNUNET_malloc (sizeof (struct Neighbour));
2688 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2689 now = GNUNET_TIME_absolute_get ();
2690 n->encrypt_key_created = now;
2691 n->last_activity = now;
2692 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2693 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2694 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2695 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2696 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2697 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
2699 GNUNET_assert (GNUNET_OK ==
2700 GNUNET_CONTAINER_multihashmap_put (neighbours,
2701 &n->peer.hashPubKey,
2703 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2704 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"),
2705 GNUNET_CONTAINER_multihashmap_size (neighbours), GNUNET_NO);
2706 neighbour_quota_update (n, NULL);
2707 consider_free_neighbour (n);
2713 * Handle CORE_SEND request.
2716 * @param client the client issuing the request
2717 * @param message the "struct SendMessage"
2720 handle_client_send (void *cls,
2721 struct GNUNET_SERVER_Client *client,
2722 const struct GNUNET_MessageHeader *message)
2724 const struct SendMessage *sm;
2725 struct Neighbour *n;
2726 struct MessageEntry *prev;
2727 struct MessageEntry *pos;
2728 struct MessageEntry *e;
2729 struct MessageEntry *min_prio_entry;
2730 struct MessageEntry *min_prio_prev;
2731 unsigned int min_prio;
2732 unsigned int queue_size;
2735 msize = ntohs (message->size);
2737 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2739 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));
2742 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2745 sm = (const struct SendMessage *) message;
2746 msize -= sizeof (struct SendMessage);
2747 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2750 GNUNET_SERVER_mst_receive (mst,
2752 (const char*) &sm[1],
2757 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2760 n = find_neighbour (&sm->peer);
2762 n = create_neighbour (&sm->peer);
2764 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2765 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2767 (unsigned int) msize,
2768 GNUNET_i2s (&sm->peer));
2770 discard_expired_messages (n);
2771 /* bound queue size */
2772 /* NOTE: this entire block to bound the queue size should be
2773 obsolete with the new client-request code and the
2774 'schedule_peer_messages' mechanism; we still have this code in
2775 here for now as a sanity check for the new mechanmism;
2776 ultimately, we should probably simply reject SEND messages that
2777 are not 'approved' (or provide a new core API for very unreliable
2778 delivery that always sends with priority 0). Food for thought. */
2779 min_prio = UINT32_MAX;
2780 min_prio_entry = NULL;
2781 min_prio_prev = NULL;
2787 if (pos->priority <= min_prio)
2789 min_prio_entry = pos;
2790 min_prio_prev = prev;
2791 min_prio = pos->priority;
2797 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2800 if (ntohl(sm->priority) <= min_prio)
2802 /* discard new entry; this should no longer happen! */
2805 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2806 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2808 (unsigned int) MAX_PEER_QUEUE_SIZE,
2809 (unsigned int) msize,
2810 (unsigned int) ntohs (message->type));
2812 GNUNET_STATISTICS_update (stats,
2813 gettext_noop ("# discarded CORE_SEND requests"),
2817 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2820 GNUNET_assert (min_prio_entry != NULL);
2821 /* discard "min_prio_entry" */
2823 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2824 "Queue full, discarding existing older request\n");
2826 GNUNET_STATISTICS_update (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 1, GNUNET_NO);
2827 if (min_prio_prev == NULL)
2828 n->messages = min_prio_entry->next;
2830 min_prio_prev->next = min_prio_entry->next;
2831 GNUNET_free (min_prio_entry);
2835 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2836 "Adding transmission request for `%4s' of size %u to queue\n",
2837 GNUNET_i2s (&sm->peer),
2838 (unsigned int) msize);
2840 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2841 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2842 e->priority = ntohl (sm->priority);
2844 memcpy (&e[1], &sm[1], msize);
2846 /* insert, keep list sorted by deadline */
2849 while ((pos != NULL) && (pos->deadline.abs_value < e->deadline.abs_value))
2860 /* consider scheduling now */
2861 process_plaintext_neighbour_queue (n);
2863 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2868 * Function called when the transport service is ready to
2869 * receive a message. Only resets 'n->th' to NULL.
2871 * @param cls neighbour to use message from
2872 * @param size number of bytes we can transmit
2873 * @param buf where to copy the message
2874 * @return number of bytes transmitted
2877 notify_transport_connect_done (void *cls, size_t size, void *buf)
2879 struct Neighbour *n = cls;
2882 if (GNUNET_YES != n->is_connected)
2884 /* transport should only call us to transmit a message after
2885 * telling us about a successful connection to the respective peer */
2887 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Timeout on notify connect!\n");
2893 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2894 _("Failed to connect to `%4s': transport failed to connect\n"),
2895 GNUNET_i2s (&n->peer));
2898 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2899 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2900 GNUNET_i2s (&n->peer));
2901 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2902 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2903 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (&set_key_retry_task,
2910 * Handle CORE_REQUEST_CONNECT request.
2913 * @param client the client issuing the request
2914 * @param message the "struct ConnectMessage"
2917 handle_client_request_connect (void *cls,
2918 struct GNUNET_SERVER_Client *client,
2919 const struct GNUNET_MessageHeader *message)
2921 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2922 struct Neighbour *n;
2923 struct GNUNET_TIME_Relative timeout;
2925 if (0 == memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2928 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2931 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2932 n = find_neighbour (&cm->peer);
2934 n = create_neighbour (&cm->peer);
2935 if ( (GNUNET_YES == n->is_connected) ||
2938 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2939 "Core received `%s' request for `%4s', already connected!\n",
2941 GNUNET_i2s (&cm->peer));
2942 return; /* already connected, or at least trying */
2944 GNUNET_STATISTICS_update (stats, gettext_noop ("# connection requests received"), 1, GNUNET_NO);
2946 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2947 "Core received `%s' request for `%4s', will try to establish connection\n",
2949 GNUNET_i2s (&cm->peer));
2951 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2952 /* ask transport to connect to the peer */
2953 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2955 sizeof (struct GNUNET_MessageHeader), 0,
2957 ¬ify_transport_connect_done,
2959 GNUNET_break (NULL != n->th);
2964 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2965 * the neighbour's struct and retry send_key. Or, if we did not get a
2966 * HELLO, just do nothing.
2968 * @param cls the 'struct Neighbour' to retry sending the key for
2969 * @param peer the peer for which this is the HELLO
2970 * @param hello HELLO message of that peer
2973 process_hello_retry_send_key (void *cls,
2974 const struct GNUNET_PeerIdentity *peer,
2975 const struct GNUNET_HELLO_Message *hello)
2977 struct Neighbour *n = cls;
2982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2983 "Entered `%s' and `%s' is NULL!\n",
2984 "process_hello_retry_send_key",
2988 if (n->public_key != NULL)
2990 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2992 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
2993 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2995 GNUNET_STATISTICS_update (stats,
2996 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3004 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3005 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
3006 GNUNET_i2s (&n->peer));
3008 GNUNET_STATISTICS_update (stats,
3009 gettext_noop ("# Delayed connecting due to lack of public key"),
3012 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
3013 n->retry_set_key_task
3014 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3015 &set_key_retry_task, n);
3021 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3022 "Entered `%s' for peer `%4s'\n",
3023 "process_hello_retry_send_key",
3026 if (n->public_key != NULL)
3028 /* already have public key, why are we here? */
3034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3035 "Received new `%s' message for `%4s', initiating key exchange.\n",
3040 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3041 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3043 GNUNET_STATISTICS_update (stats,
3044 gettext_noop ("# Error extracting public key from HELLO"),
3047 GNUNET_free (n->public_key);
3048 n->public_key = NULL;
3050 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3051 "GNUNET_HELLO_get_key returned awfully\n");
3059 * Send our key (and encrypted PING) to the other peer.
3061 * @param n the other peer
3064 send_key (struct Neighbour *n)
3066 struct MessageEntry *pos;
3067 struct SetKeyMessage *sm;
3068 struct MessageEntry *me;
3069 struct PingMessage pp;
3070 struct PingMessage *pm;
3071 struct GNUNET_CRYPTO_AesInitializationVector iv;
3073 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3075 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3076 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3078 if (n->pitr != NULL)
3081 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3082 "Key exchange in progress with `%4s'.\n",
3083 GNUNET_i2s (&n->peer));
3085 return; /* already in progress */
3087 if (GNUNET_YES != n->is_connected)
3090 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3091 "Not yet connected to peer `%4s'!\n",
3092 GNUNET_i2s (&n->peer));
3096 GNUNET_STATISTICS_update (stats,
3097 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
3100 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
3102 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
3104 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3105 ¬ify_encrypted_transmit_ready,
3111 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3112 "Asked to perform key exchange with `%4s'.\n",
3113 GNUNET_i2s (&n->peer));
3115 if (n->public_key == NULL)
3117 /* lookup n's public key, then try again */
3119 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3120 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
3121 GNUNET_i2s (&n->peer));
3123 GNUNET_assert (n->pitr == NULL);
3124 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3126 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
3127 &process_hello_retry_send_key, n);
3130 pos = n->encrypted_head;
3133 if (GNUNET_YES == pos->is_setkey)
3135 if (pos->sender_status == n->status)
3138 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3139 "`%s' message for `%4s' queued already\n",
3141 GNUNET_i2s (&n->peer));
3143 goto trigger_processing;
3145 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
3150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3151 "Removing queued `%s' message for `%4s', will create a new one\n",
3153 GNUNET_i2s (&n->peer));
3163 case PEER_STATE_DOWN:
3164 n->status = PEER_STATE_KEY_SENT;
3166 case PEER_STATE_KEY_SENT:
3168 case PEER_STATE_KEY_RECEIVED:
3170 case PEER_STATE_KEY_CONFIRMED:
3178 /* first, set key message */
3179 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3180 sizeof (struct SetKeyMessage) +
3181 sizeof (struct PingMessage));
3182 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
3183 me->priority = SET_KEY_PRIORITY;
3184 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
3185 me->is_setkey = GNUNET_YES;
3186 me->got_slack = GNUNET_YES; /* do not defer this one! */
3187 me->sender_status = n->status;
3188 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3192 sm = (struct SetKeyMessage *) &me[1];
3193 sm->header.size = htons (sizeof (struct SetKeyMessage));
3194 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
3195 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
3196 PEER_STATE_KEY_SENT : n->status));
3198 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3199 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3200 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3201 sizeof (struct GNUNET_PeerIdentity));
3202 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
3203 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
3204 sm->target = n->peer;
3205 GNUNET_assert (GNUNET_OK ==
3206 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
3208 GNUNET_CRYPTO_AesSessionKey),
3210 &sm->encrypted_key));
3211 GNUNET_assert (GNUNET_OK ==
3212 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
3214 pm = (struct PingMessage *) &sm[1];
3215 pm->header.size = htons (sizeof (struct PingMessage));
3216 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
3217 pm->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3218 derive_iv (&iv, &n->encrypt_key, pm->iv_seed, &n->peer);
3219 pp.challenge = n->ping_challenge;
3220 pp.target = n->peer;
3222 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3223 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u, IV %u (salt %u).\n",
3225 (unsigned int) n->ping_challenge,
3226 GNUNET_i2s (&n->peer),
3227 (unsigned int) n->encrypt_key.crc32,
3228 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3235 sizeof (struct PingMessage) -
3236 ((void *) &pm->target - (void *) pm));
3237 GNUNET_STATISTICS_update (stats,
3238 gettext_noop ("# SET_KEY and PING messages created"),
3242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3243 "Have %llu ms left for `%s' transmission.\n",
3244 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).rel_value,
3248 /* trigger queue processing */
3249 process_encrypted_neighbour_queue (n);
3250 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
3251 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
3252 n->retry_set_key_task
3253 = GNUNET_SCHEDULER_add_delayed (n->set_key_retry_frequency,
3254 &set_key_retry_task, n);
3259 * We received a SET_KEY message. Validate and update
3260 * our key material and status.
3262 * @param n the neighbour from which we received message m
3263 * @param m the set key message we received
3264 * @param ats performance data
3265 * @param ats_count number of entries in ats (excluding 0-termination)
3268 handle_set_key (struct Neighbour *n,
3269 const struct SetKeyMessage *m,
3270 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3271 uint32_t ats_count);
3276 * PEERINFO is giving us a HELLO for a peer. Add the public key to
3277 * the neighbour's struct and retry handling the set_key message. Or,
3278 * if we did not get a HELLO, just free the set key message.
3280 * @param cls pointer to the set key message
3281 * @param peer the peer for which this is the HELLO
3282 * @param hello HELLO message of that peer
3285 process_hello_retry_handle_set_key (void *cls,
3286 const struct GNUNET_PeerIdentity *peer,
3287 const struct GNUNET_HELLO_Message *hello)
3289 struct Neighbour *n = cls;
3290 struct SetKeyMessage *sm = n->skm;
3296 if (n->public_key != NULL)
3299 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3300 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
3302 GNUNET_i2s (&n->peer),
3305 handle_set_key (n, sm, NULL, 0);
3309 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3310 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
3312 GNUNET_i2s (&n->peer));
3317 if (n->public_key != NULL)
3318 return; /* multiple HELLOs match!? */
3320 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
3321 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
3323 GNUNET_break_op (0);
3324 GNUNET_free (n->public_key);
3325 n->public_key = NULL;
3331 * Merge the given performance data with the data we currently
3332 * track for the given neighbour.
3334 * @param n neighbour
3335 * @param ats new performance data
3336 * @param ats_count number of records in ats
3339 update_neighbour_performance (struct Neighbour *n,
3340 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3348 for (i = 0; i < ats_count; i++)
3350 for (j=0;j < n->ats_count; j++)
3352 if (n->ats[j].type == ats[i].type)
3354 n->ats[j].value = ats[i].value;
3358 if (j == n->ats_count)
3360 GNUNET_array_append (n->ats,
3369 * We received a PING message. Validate and transmit
3372 * @param n sender of the PING
3373 * @param m the encrypted PING message itself
3374 * @param ats performance data
3375 * @param ats_count number of entries in ats (excluding 0-termination)
3378 handle_ping (struct Neighbour *n,
3379 const struct PingMessage *m,
3380 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3383 struct PingMessage t;
3384 struct PongMessage tx;
3385 struct PongMessage *tp;
3386 struct MessageEntry *me;
3387 struct GNUNET_CRYPTO_AesInitializationVector iv;
3390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3391 "Core service receives `%s' request from `%4s'.\n",
3392 "PING", GNUNET_i2s (&n->peer));
3394 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3400 sizeof (struct PingMessage) -
3401 ((void *) &m->target - (void *) m)))
3404 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3405 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u, IV %u (salt %u)\n",
3407 GNUNET_i2s (&t.target),
3408 (unsigned int) t.challenge,
3409 (unsigned int) n->decrypt_key.crc32,
3410 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3413 GNUNET_STATISTICS_update (stats,
3414 gettext_noop ("# PING messages decrypted"),
3417 if (0 != memcmp (&t.target,
3418 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3420 GNUNET_break_op (0);
3423 update_neighbour_performance (n, ats, ats_count);
3424 me = GNUNET_malloc (sizeof (struct MessageEntry) +
3425 sizeof (struct PongMessage));
3426 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
3430 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
3431 me->priority = PONG_PRIORITY;
3432 me->size = sizeof (struct PongMessage);
3433 tx.inbound_bw_limit = n->bw_in;
3434 tx.challenge = t.challenge;
3435 tx.target = t.target;
3436 tp = (struct PongMessage *) &me[1];
3437 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
3438 tp->header.size = htons (sizeof (struct PongMessage));
3439 tp->iv_seed = GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
3440 derive_pong_iv (&iv, &n->encrypt_key, tp->iv_seed, t.challenge, &n->peer);
3445 sizeof (struct PongMessage) -
3446 ((void *) &tp->challenge - (void *) tp));
3447 GNUNET_STATISTICS_update (stats,
3448 gettext_noop ("# PONG messages created"),
3452 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3453 "Encrypting `%s' with challenge %u using key %u, IV %u (salt %u)\n",
3455 (unsigned int) t.challenge,
3456 (unsigned int) n->encrypt_key.crc32,
3457 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3460 /* trigger queue processing */
3461 process_encrypted_neighbour_queue (n);
3466 * We received a PONG message. Validate and update our status.
3468 * @param n sender of the PONG
3469 * @param m the encrypted PONG message itself
3470 * @param ats performance data
3471 * @param ats_count number of entries in ats (excluding 0-termination)
3474 handle_pong (struct Neighbour *n,
3475 const struct PongMessage *m,
3476 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3479 struct PongMessage t;
3480 struct ConnectNotifyMessage *cnm;
3481 struct GNUNET_CRYPTO_AesInitializationVector iv;
3482 char buf[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
3483 struct GNUNET_TRANSPORT_ATS_Information *mats;
3487 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3488 "Core service receives `%s' response from `%4s'.\n",
3489 "PONG", GNUNET_i2s (&n->peer));
3491 /* mark as garbage, just to be sure */
3492 memset (&t, 255, sizeof (t));
3493 derive_pong_iv (&iv, &n->decrypt_key, m->iv_seed, n->ping_challenge,
3500 sizeof (struct PongMessage) -
3501 ((void *) &m->challenge - (void *) m)))
3503 GNUNET_break_op (0);
3506 GNUNET_STATISTICS_update (stats,
3507 gettext_noop ("# PONG messages decrypted"),
3511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3512 "Decrypted `%s' from `%4s' with challenge %u using key %u, IV %u (salt %u)\n",
3514 GNUNET_i2s (&t.target),
3515 (unsigned int) t.challenge,
3516 (unsigned int) n->decrypt_key.crc32,
3517 GNUNET_CRYPTO_crc32_n (&iv, sizeof(iv)),
3520 if ((0 != memcmp (&t.target,
3522 sizeof (struct GNUNET_PeerIdentity))) ||
3523 (n->ping_challenge != t.challenge))
3525 /* PONG malformed */
3527 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3528 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
3530 GNUNET_i2s (&n->peer),
3531 (unsigned int) n->ping_challenge);
3532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3533 "Received malformed `%s' received from `%4s' with challenge %u\n",
3534 "PONG", GNUNET_i2s (&t.target),
3535 (unsigned int) t.challenge);
3537 GNUNET_break_op (n->ping_challenge != t.challenge);
3542 case PEER_STATE_DOWN:
3543 GNUNET_break (0); /* should be impossible */
3545 case PEER_STATE_KEY_SENT:
3546 GNUNET_break (0); /* should be impossible, how did we decrypt? */
3548 case PEER_STATE_KEY_RECEIVED:
3549 GNUNET_STATISTICS_update (stats,
3550 gettext_noop ("# Session keys confirmed via PONG"),
3553 n->status = PEER_STATE_KEY_CONFIRMED;
3554 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
3556 n->bw_out_external_limit = t.inbound_bw_limit;
3557 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3558 n->bw_out_internal_limit);
3559 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3561 GNUNET_TRANSPORT_set_quota (transport,
3565 GNUNET_TIME_UNIT_FOREVER_REL,
3569 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3570 "Confirmed key via `%s' message for peer `%4s'\n",
3571 "PONG", GNUNET_i2s (&n->peer));
3573 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
3575 GNUNET_SCHEDULER_cancel (n->retry_set_key_task);
3576 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
3578 update_neighbour_performance (n, ats, ats_count);
3579 size = sizeof (struct ConnectNotifyMessage) +
3580 (n->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3581 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3584 /* recovery strategy: throw away performance data */
3585 GNUNET_array_grow (n->ats,
3588 size = sizeof (struct PeerStatusNotifyMessage) +
3589 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3591 cnm = (struct ConnectNotifyMessage*) buf;
3592 cnm->header.size = htons (size);
3593 cnm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
3594 cnm->ats_count = htonl (n->ats_count);
3595 cnm->peer = n->peer;
3599 n->ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information));
3600 mats[n->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3601 mats[n->ats_count].value = htonl (0);
3602 send_to_all_clients (&cnm->header,
3604 GNUNET_CORE_OPTION_SEND_CONNECT);
3605 process_encrypted_neighbour_queue (n);
3607 case PEER_STATE_KEY_CONFIRMED:
3608 n->last_activity = GNUNET_TIME_absolute_get ();
3609 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3610 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
3612 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3615 handle_peer_status_change (n);
3625 * We received a SET_KEY message. Validate and update
3626 * our key material and status.
3628 * @param n the neighbour from which we received message m
3629 * @param m the set key message we received
3630 * @param ats performance data
3631 * @param ats_count number of entries in ats (excluding 0-termination)
3634 handle_set_key (struct Neighbour *n,
3635 const struct SetKeyMessage *m,
3636 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3639 struct SetKeyMessage *m_cpy;
3640 struct GNUNET_TIME_Absolute t;
3641 struct GNUNET_CRYPTO_AesSessionKey k;
3642 struct PingMessage *ping;
3643 struct PongMessage *pong;
3644 enum PeerStateMachine sender_status;
3647 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3648 "Core service receives `%s' request from `%4s'.\n",
3649 "SET_KEY", GNUNET_i2s (&n->peer));
3651 if (n->public_key == NULL)
3653 if (n->pitr != NULL)
3656 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3657 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3663 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3664 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3666 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3667 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3668 /* lookup n's public key, then try again */
3669 GNUNET_assert (n->skm == NULL);
3671 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3673 GNUNET_TIME_UNIT_MINUTES,
3674 &process_hello_retry_handle_set_key, n);
3675 GNUNET_STATISTICS_update (stats,
3676 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3681 if (0 != memcmp (&m->target,
3683 sizeof (struct GNUNET_PeerIdentity)))
3685 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3686 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3688 GNUNET_i2s (&m->target));
3691 if ((ntohl (m->purpose.size) !=
3692 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3693 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3694 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3695 sizeof (struct GNUNET_PeerIdentity)) ||
3697 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3698 &m->purpose, &m->signature, n->public_key)))
3700 /* invalid signature */
3701 GNUNET_break_op (0);
3704 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3705 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3706 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3707 (t.abs_value < n->decrypt_key_created.abs_value))
3709 /* this could rarely happen due to massive re-ordering of
3710 messages on the network level, but is most likely either
3711 a bug or some adversary messing with us. Report. */
3712 GNUNET_break_op (0);
3716 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3717 "Decrypting key material.\n");
3719 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3722 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3723 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3724 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3726 /* failed to decrypt !? */
3727 GNUNET_break_op (0);
3730 GNUNET_STATISTICS_update (stats,
3731 gettext_noop ("# SET_KEY messages decrypted"),
3735 if (n->decrypt_key_created.abs_value != t.abs_value)
3737 /* fresh key, reset sequence numbers */
3738 n->last_sequence_number_received = 0;
3739 n->last_packets_bitmap = 0;
3740 n->decrypt_key_created = t;
3742 update_neighbour_performance (n, ats, ats_count);
3743 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3746 case PEER_STATE_DOWN:
3747 n->status = PEER_STATE_KEY_RECEIVED;
3749 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3750 "Responding to `%s' with my own key.\n", "SET_KEY");
3754 case PEER_STATE_KEY_SENT:
3755 case PEER_STATE_KEY_RECEIVED:
3756 n->status = PEER_STATE_KEY_RECEIVED;
3757 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3758 (sender_status != PEER_STATE_KEY_CONFIRMED))
3761 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3762 "Responding to `%s' with my own key (other peer has status %u).\n",
3764 (unsigned int) sender_status);
3769 case PEER_STATE_KEY_CONFIRMED:
3770 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3771 (sender_status != PEER_STATE_KEY_CONFIRMED))
3774 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3775 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3777 (unsigned int) sender_status);
3786 if (n->pending_ping != NULL)
3788 ping = n->pending_ping;
3789 n->pending_ping = NULL;
3790 handle_ping (n, ping, NULL, 0);
3793 if (n->pending_pong != NULL)
3795 pong = n->pending_pong;
3796 n->pending_pong = NULL;
3797 handle_pong (n, pong, NULL, 0);
3804 * Send a P2P message to a client.
3806 * @param sender who sent us the message?
3807 * @param client who should we give the message to?
3808 * @param m contains the message to transmit
3809 * @param msize number of bytes in buf to transmit
3812 send_p2p_message_to_client (struct Neighbour *sender,
3813 struct Client *client,
3814 const void *m, size_t msize)
3816 size_t size = msize + sizeof (struct NotifyTrafficMessage) +
3817 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3819 struct NotifyTrafficMessage *ntm;
3820 struct GNUNET_TRANSPORT_ATS_Information *ats;
3822 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
3825 /* recovery strategy: throw performance data away... */
3826 GNUNET_array_grow (sender->ats,
3829 size = msize + sizeof (struct NotifyTrafficMessage) +
3830 (sender->ats_count) * sizeof (struct GNUNET_TRANSPORT_ATS_Information);
3833 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3834 "Core service passes message from `%4s' of type %u to client.\n",
3835 GNUNET_i2s(&sender->peer),
3836 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3838 ntm = (struct NotifyTrafficMessage *) buf;
3839 ntm->header.size = htons (size);
3840 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3841 ntm->ats_count = htonl (sender->ats_count);
3842 ntm->peer = sender->peer;
3846 sizeof (struct GNUNET_TRANSPORT_ATS_Information) * sender->ats_count);
3847 ats[sender->ats_count].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
3848 ats[sender->ats_count].value = htonl (0);
3849 memcpy (&ats[sender->ats_count+1],
3852 send_to_client (client, &ntm->header, GNUNET_YES);
3857 * Deliver P2P message to interested clients.
3859 * @param cls always NULL
3860 * @param client who sent us the message (struct Neighbour)
3861 * @param m the message
3864 deliver_message (void *cls,
3866 const struct GNUNET_MessageHeader *m)
3868 struct Neighbour *sender = client;
3869 size_t msize = ntohs (m->size);
3871 struct Client *cpos;
3877 type = ntohs (m->type);
3879 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3880 "Received encapsulated message of type %u and size %u from `%4s'\n",
3881 (unsigned int) type,
3883 GNUNET_i2s (&sender->peer));
3885 GNUNET_snprintf (buf,
3887 gettext_noop ("# bytes of messages of type %u received"),
3888 (unsigned int) type);
3889 GNUNET_STATISTICS_set (stats,
3893 dropped = GNUNET_YES;
3895 while (cpos != NULL)
3897 deliver_full = GNUNET_NO;
3898 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
3899 deliver_full = GNUNET_YES;
3902 for (tpos = 0; tpos < cpos->tcnt; tpos++)
3904 if (type != cpos->types[tpos])
3906 deliver_full = GNUNET_YES;
3910 if (GNUNET_YES == deliver_full)
3912 send_p2p_message_to_client (sender, cpos, m, msize);
3913 dropped = GNUNET_NO;
3915 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
3917 send_p2p_message_to_client (sender, cpos, m,
3918 sizeof (struct GNUNET_MessageHeader));
3922 if (dropped == GNUNET_YES)
3925 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3926 "Message of type %u from `%4s' not delivered to any client.\n",
3927 (unsigned int) type,
3928 GNUNET_i2s (&sender->peer));
3930 GNUNET_STATISTICS_update (stats,
3931 gettext_noop ("# messages not delivered to any client"),
3938 * We received an encrypted message. Decrypt, validate and
3939 * pass on to the appropriate clients.
3941 * @param n target of the message
3942 * @param m encrypted message
3943 * @param ats performance data
3944 * @param ats_count number of entries in ats (excluding 0-termination)
3947 handle_encrypted_message (struct Neighbour *n,
3948 const struct EncryptedMessage *m,
3949 const struct GNUNET_TRANSPORT_ATS_Information *ats,
3952 size_t size = ntohs (m->header.size);
3954 struct EncryptedMessage *pt; /* plaintext */
3957 struct GNUNET_TIME_Absolute t;
3958 struct GNUNET_CRYPTO_AesInitializationVector iv;
3959 struct GNUNET_CRYPTO_AuthKey auth_key;
3962 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3963 "Core service receives `%s' request from `%4s'.\n",
3964 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
3967 derive_auth_key (&auth_key,
3970 n->decrypt_key_created);
3971 GNUNET_CRYPTO_hmac (&auth_key,
3972 &m->sequence_number,
3973 size - ENCRYPTED_HEADER_SIZE, &ph);
3975 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3976 "Re-Authenticated %u bytes of ciphertext (`%u'): `%s'\n",
3977 (unsigned int) size - ENCRYPTED_HEADER_SIZE,
3978 GNUNET_CRYPTO_crc32_n (&m->sequence_number,
3979 size - ENCRYPTED_HEADER_SIZE),
3983 if (0 != memcmp (&ph,
3985 sizeof (GNUNET_HashCode)))
3987 /* checksum failed */
3988 GNUNET_break_op (0);
3991 derive_iv (&iv, &n->decrypt_key, m->iv_seed, &my_identity);
3996 &m->sequence_number,
3997 &buf[ENCRYPTED_HEADER_SIZE],
3998 size - ENCRYPTED_HEADER_SIZE))
4000 pt = (struct EncryptedMessage *) buf;
4002 /* validate sequence number */
4003 snum = ntohl (pt->sequence_number);
4004 if (n->last_sequence_number_received == snum)
4006 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4007 "Received duplicate message, ignoring.\n");
4008 /* duplicate, ignore */
4009 GNUNET_STATISTICS_set (stats,
4010 gettext_noop ("# bytes dropped (duplicates)"),
4015 if ((n->last_sequence_number_received > snum) &&
4016 (n->last_sequence_number_received - snum > 32))
4018 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4019 "Received ancient out of sequence message, ignoring.\n");
4020 /* ancient out of sequence, ignore */
4021 GNUNET_STATISTICS_set (stats,
4022 gettext_noop ("# bytes dropped (out of sequence)"),
4027 if (n->last_sequence_number_received > snum)
4029 unsigned int rotbit =
4030 1 << (n->last_sequence_number_received - snum - 1);
4031 if ((n->last_packets_bitmap & rotbit) != 0)
4033 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4034 "Received duplicate message, ignoring.\n");
4035 GNUNET_STATISTICS_set (stats,
4036 gettext_noop ("# bytes dropped (duplicates)"),
4039 /* duplicate, ignore */
4042 n->last_packets_bitmap |= rotbit;
4044 if (n->last_sequence_number_received < snum)
4046 int shift = (snum - n->last_sequence_number_received);
4047 if (shift >= 8 * sizeof(n->last_packets_bitmap))
4048 n->last_packets_bitmap = 0;
4050 n->last_packets_bitmap <<= shift;
4051 n->last_sequence_number_received = snum;
4054 /* check timestamp */
4055 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
4056 if (GNUNET_TIME_absolute_get_duration (t).rel_value > MAX_MESSAGE_AGE.rel_value)
4058 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4060 ("Message received far too old (%llu ms). Content ignored.\n"),
4061 GNUNET_TIME_absolute_get_duration (t).rel_value);
4062 GNUNET_STATISTICS_set (stats,
4063 gettext_noop ("# bytes dropped (ancient message)"),
4069 /* process decrypted message(s) */
4070 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
4072 #if DEBUG_CORE_SET_QUOTA
4073 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4074 "Received %u b/s as new inbound limit for peer `%4s'\n",
4075 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
4076 GNUNET_i2s (&n->peer));
4078 n->bw_out_external_limit = pt->inbound_bw_limit;
4079 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
4080 n->bw_out_internal_limit);
4081 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
4083 GNUNET_TRANSPORT_set_quota (transport,
4087 GNUNET_TIME_UNIT_FOREVER_REL,
4090 n->last_activity = GNUNET_TIME_absolute_get ();
4091 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4092 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4094 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4097 GNUNET_STATISTICS_set (stats,
4098 gettext_noop ("# bytes of payload decrypted"),
4099 size - sizeof (struct EncryptedMessage),
4101 handle_peer_status_change (n);
4102 update_neighbour_performance (n, ats, ats_count);
4103 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
4105 &buf[sizeof (struct EncryptedMessage)],
4106 size - sizeof (struct EncryptedMessage),
4107 GNUNET_YES, GNUNET_NO))
4108 GNUNET_break_op (0);
4113 * Function called by the transport for each received message.
4115 * @param cls closure
4116 * @param peer (claimed) identity of the other peer
4117 * @param message the message
4118 * @param ats performance data
4119 * @param ats_count number of entries in ats (excluding 0-termination)
4122 handle_transport_receive (void *cls,
4123 const struct GNUNET_PeerIdentity *peer,
4124 const struct GNUNET_MessageHeader *message,
4125 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4128 struct Neighbour *n;
4129 struct GNUNET_TIME_Absolute now;
4136 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4137 "Received message of type %u from `%4s', demultiplexing.\n",
4138 (unsigned int) ntohs (message->type),
4141 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4146 n = find_neighbour (peer);
4148 n = create_neighbour (peer);
4149 changed = GNUNET_YES; /* FIXME... */
4150 up = (n->status == PEER_STATE_KEY_CONFIRMED);
4151 type = ntohs (message->type);
4152 size = ntohs (message->size);
4155 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
4156 if (size != sizeof (struct SetKeyMessage))
4158 GNUNET_break_op (0);
4161 GNUNET_STATISTICS_update (stats, gettext_noop ("# session keys received"), 1, GNUNET_NO);
4163 (const struct SetKeyMessage *) message,
4166 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
4167 if (size < sizeof (struct EncryptedMessage) +
4168 sizeof (struct GNUNET_MessageHeader))
4170 GNUNET_break_op (0);
4173 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4174 (n->status != PEER_STATE_KEY_CONFIRMED))
4176 GNUNET_break_op (0);
4179 handle_encrypted_message (n,
4180 (const struct EncryptedMessage *) message,
4183 case GNUNET_MESSAGE_TYPE_CORE_PING:
4184 if (size != sizeof (struct PingMessage))
4186 GNUNET_break_op (0);
4189 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
4190 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
4191 (n->status != PEER_STATE_KEY_CONFIRMED))
4194 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4195 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4196 "PING", GNUNET_i2s (&n->peer));
4198 GNUNET_free_non_null (n->pending_ping);
4199 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
4200 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
4203 handle_ping (n, (const struct PingMessage *) message,
4206 case GNUNET_MESSAGE_TYPE_CORE_PONG:
4207 if (size != sizeof (struct PongMessage))
4209 GNUNET_break_op (0);
4212 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
4213 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
4214 (n->status != PEER_STATE_KEY_CONFIRMED) )
4217 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4218 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
4219 "PONG", GNUNET_i2s (&n->peer));
4221 GNUNET_free_non_null (n->pending_pong);
4222 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
4223 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
4226 handle_pong (n, (const struct PongMessage *) message,
4230 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
4231 _("Unsupported message of type %u received.\n"),
4232 (unsigned int) type);
4235 if (n->status == PEER_STATE_KEY_CONFIRMED)
4237 now = GNUNET_TIME_absolute_get ();
4238 n->last_activity = now;
4239 changed = GNUNET_YES;
4242 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), 1, GNUNET_NO);
4243 n->time_established = now;
4245 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
4246 GNUNET_SCHEDULER_cancel (n->keep_alive_task);
4248 = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
4253 handle_peer_status_change (n);
4258 * Function that recalculates the bandwidth quota for the
4259 * given neighbour and transmits it to the transport service.
4261 * @param cls neighbour for the quota update
4265 neighbour_quota_update (void *cls,
4266 const struct GNUNET_SCHEDULER_TaskContext *tc)
4268 struct Neighbour *n = cls;
4269 struct GNUNET_BANDWIDTH_Value32NBO q_in;
4270 struct GNUNET_BANDWIDTH_Value32NBO q_out;
4271 struct GNUNET_BANDWIDTH_Value32NBO q_out_min;
4274 unsigned long long distributable;
4275 uint64_t need_per_peer;
4276 uint64_t need_per_second;
4277 unsigned int neighbour_count;
4280 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4281 "Neighbour quota update calculation running for peer `%4s'\n",
4282 GNUNET_i2s (&n->peer));
4284 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
4285 /* calculate relative preference among all neighbours;
4286 divides by a bit more to avoid division by zero AND to
4287 account for possibility of new neighbours joining any time
4288 AND to convert to double... */
4289 neighbour_count = GNUNET_CONTAINER_multihashmap_size (neighbours);
4290 if (neighbour_count == 0)
4292 if (preference_sum == 0)
4294 pref_rel = 1.0 / (double) neighbour_count;
4298 pref_rel = n->current_preference / preference_sum;
4300 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
4301 GNUNET_TIME_UNIT_SECONDS);
4302 need_per_second = need_per_peer * neighbour_count;
4304 /* calculate inbound bandwidth per peer */
4306 if (bandwidth_target_in_bps > need_per_second)
4307 distributable = bandwidth_target_in_bps - need_per_second;
4308 share = distributable * pref_rel;
4309 if (share + need_per_peer > UINT32_MAX)
4310 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4312 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4314 /* calculate outbound bandwidth per peer */
4316 if (bandwidth_target_out_bps > need_per_second)
4317 distributable = bandwidth_target_out_bps - need_per_second;
4318 share = distributable * pref_rel;
4319 if (share + need_per_peer > UINT32_MAX)
4320 q_out = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
4322 q_out = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
4323 n->bw_out_internal_limit = q_out;
4325 q_out_min = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit, n->bw_out_internal_limit);
4326 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window, n->bw_out);
4328 /* check if we want to disconnect for good due to inactivity */
4329 if ( (GNUNET_TIME_absolute_get_duration (get_neighbour_timeout (n)).rel_value > 0) &&
4330 (GNUNET_TIME_absolute_get_duration (n->time_established).rel_value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value) )
4333 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4334 "Forcing disconnect of `%4s' due to inactivity\n",
4335 GNUNET_i2s (&n->peer));
4337 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
4339 #if DEBUG_CORE_QUOTA
4340 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4341 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
4342 GNUNET_i2s (&n->peer),
4343 (unsigned int) ntohl (q_in.value__),
4344 bandwidth_target_out_bps,
4345 (unsigned int) ntohl (n->bw_in.value__),
4346 (unsigned int) ntohl (n->bw_out.value__),
4347 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
4349 if ((n->bw_in.value__ != q_in.value__) || (n->bw_out.value__ != q_out_min.value__))
4351 if (n->bw_in.value__ != q_in.value__)
4353 if (n->bw_out.value__ != q_out_min.value__)
4354 n->bw_out = q_out_min;
4355 if (GNUNET_YES == n->is_connected)
4356 GNUNET_TRANSPORT_set_quota (transport,
4360 GNUNET_TIME_UNIT_FOREVER_REL,
4362 handle_peer_status_change (n);
4364 schedule_quota_update (n);
4369 * Function called by transport to notify us that
4370 * a peer connected to us (on the network level).
4372 * @param cls closure
4373 * @param peer the peer that connected
4374 * @param ats performance data
4375 * @param ats_count number of entries in ats (excluding 0-termination)
4378 handle_transport_notify_connect (void *cls,
4379 const struct GNUNET_PeerIdentity *peer,
4380 const struct GNUNET_TRANSPORT_ATS_Information *ats,
4383 struct Neighbour *n;
4385 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
4390 n = find_neighbour (peer);
4393 if (GNUNET_YES == n->is_connected)
4395 /* duplicate connect notification!? */
4402 n = create_neighbour (peer);
4404 GNUNET_STATISTICS_update (stats,
4405 gettext_noop ("# peers connected (transport)"),
4408 n->is_connected = GNUNET_YES;
4409 update_neighbour_performance (n, ats, ats_count);
4410 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
4413 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
4417 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4418 "Received connection from `%4s'.\n",
4419 GNUNET_i2s (&n->peer));
4421 GNUNET_TRANSPORT_set_quota (transport,
4425 GNUNET_TIME_UNIT_FOREVER_REL,
4432 * Function called by transport telling us that a peer
4435 * @param cls closure
4436 * @param peer the peer that disconnected
4439 handle_transport_notify_disconnect (void *cls,
4440 const struct GNUNET_PeerIdentity *peer)
4442 struct DisconnectNotifyMessage cnm;
4443 struct Neighbour *n;
4444 struct ClientActiveRequest *car;
4445 struct GNUNET_TIME_Relative left;
4448 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4449 "Peer `%4s' disconnected from us; received notification from transport.\n", GNUNET_i2s (peer));
4452 n = find_neighbour (peer);
4458 GNUNET_break (n->is_connected);
4459 if (n->status == PEER_STATE_KEY_CONFIRMED)
4461 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
4462 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
4464 send_to_all_clients (&cnm.header, GNUNET_NO, GNUNET_CORE_OPTION_SEND_DISCONNECT);
4467 /* On transport disconnect transport doesn't cancel requests, so must do so here. */
4470 GNUNET_TRANSPORT_notify_transmit_ready_cancel(n->th);
4474 n->is_connected = GNUNET_NO;
4475 n->status = PEER_STATE_DOWN;
4476 while (NULL != (car = n->active_client_request_head))
4478 GNUNET_CONTAINER_DLL_remove (n->active_client_request_head,
4479 n->active_client_request_tail,
4481 GNUNET_CONTAINER_multihashmap_remove (car->client->requests,
4482 &n->peer.hashPubKey,
4487 GNUNET_STATISTICS_update (stats,
4488 gettext_noop ("# peers connected (transport)"),
4491 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
4492 GNUNET_SCHEDULER_cancel (n->dead_clean_task);
4493 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
4494 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
4495 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
4497 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
4498 &consider_free_task,
4504 * Wrapper around 'free_neighbour'; helper for 'cleaning_task'.
4507 free_neighbour_helper (void *cls,
4508 const GNUNET_HashCode *key,
4511 struct Neighbour *n = value;
4519 * Last task run during shutdown. Disconnects us from
4523 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
4528 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4529 "Core service shutting down.\n");
4531 GNUNET_CONTAINER_multihashmap_iterate (neighbours,
4532 &free_neighbour_helper,
4534 GNUNET_CONTAINER_multihashmap_destroy (neighbours);
4536 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), 0, GNUNET_NO);
4537 GNUNET_assert (transport != NULL);
4538 GNUNET_TRANSPORT_disconnect (transport);
4540 GNUNET_SERVER_notification_context_destroy (notifier);
4542 while (NULL != (c = clients))
4543 handle_client_disconnect (NULL, c->client_handle);
4544 if (my_private_key != NULL)
4545 GNUNET_CRYPTO_rsa_key_free (my_private_key);
4547 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
4548 if (peerinfo != NULL)
4549 GNUNET_PEERINFO_disconnect (peerinfo);
4551 GNUNET_SERVER_mst_destroy (mst);
4556 * Initiate core service.
4558 * @param cls closure
4559 * @param server the initialized server
4560 * @param c configuration to use
4564 struct GNUNET_SERVER_Handle *server,
4565 const struct GNUNET_CONFIGURATION_Handle *c)
4567 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
4568 {&handle_client_init, NULL,
4569 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
4570 {&handle_client_iterate_peers, NULL,
4571 GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS,
4572 sizeof (struct GNUNET_MessageHeader)},
4573 {&handle_client_request_info, NULL,
4574 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
4575 sizeof (struct RequestInfoMessage)},
4576 {&handle_client_send_request, NULL,
4577 GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST,
4578 sizeof (struct SendMessageRequest)},
4579 {&handle_client_send, NULL,
4580 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
4581 {&handle_client_request_connect, NULL,
4582 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
4583 sizeof (struct ConnectMessage)},
4589 /* parse configuration */
4592 GNUNET_CONFIGURATION_get_value_number (c,
4595 &bandwidth_target_in_bps)) ||
4597 GNUNET_CONFIGURATION_get_value_number (c,
4600 &bandwidth_target_out_bps)) ||
4602 GNUNET_CONFIGURATION_get_value_filename (c,
4604 "HOSTKEY", &keyfile)))
4606 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4608 ("Core service is lacking key configuration settings. Exiting.\n"));
4609 GNUNET_SCHEDULER_shutdown ();
4612 peerinfo = GNUNET_PEERINFO_connect (cfg);
4613 if (NULL == peerinfo)
4615 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4616 _("Could not access PEERINFO service. Exiting.\n"));
4617 GNUNET_SCHEDULER_shutdown ();
4618 GNUNET_free (keyfile);
4621 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
4622 GNUNET_free (keyfile);
4623 if (my_private_key == NULL)
4625 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
4626 _("Core service could not access hostkey. Exiting.\n"));
4627 GNUNET_PEERINFO_disconnect (peerinfo);
4628 GNUNET_SCHEDULER_shutdown ();
4631 neighbours = GNUNET_CONTAINER_multihashmap_create (128);
4632 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
4633 GNUNET_CRYPTO_hash (&my_public_key,
4634 sizeof (my_public_key), &my_identity.hashPubKey);
4635 self.public_key = &my_public_key;
4636 self.last_activity = GNUNET_TIME_UNIT_FOREVER_ABS;
4637 self.status = PEER_STATE_KEY_CONFIRMED;
4638 self.is_connected = GNUNET_YES;
4639 /* setup notification */
4640 notifier = GNUNET_SERVER_notification_context_create (server,
4642 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
4643 /* setup transport connection */
4644 transport = GNUNET_TRANSPORT_connect (cfg,
4647 &handle_transport_receive,
4648 &handle_transport_notify_connect,
4649 &handle_transport_notify_disconnect);
4650 GNUNET_assert (NULL != transport);
4651 stats = GNUNET_STATISTICS_create ("core", cfg);
4653 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded CORE_SEND requests"), 0, GNUNET_NO);
4654 GNUNET_STATISTICS_set (stats, gettext_noop ("# discarded lower priority CORE_SEND requests"), 0, GNUNET_NO);
4656 mst = GNUNET_SERVER_mst_create (&deliver_message,
4658 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
4659 &cleaning_task, NULL);
4660 /* process client requests */
4661 GNUNET_SERVER_add_handlers (server, handlers);
4662 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
4663 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
4669 * The main function for the transport service.
4671 * @param argc number of arguments from the command line
4672 * @param argv command line arguments
4673 * @return 0 ok, 1 on error
4676 main (int argc, char *const *argv)
4678 return (GNUNET_OK ==
4679 GNUNET_SERVICE_run (argc,
4682 GNUNET_SERVICE_OPTION_NONE,
4683 &run, NULL)) ? 0 : 1;
4686 /* end of gnunet-service-core.c */