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
158 PEER_STATE_KEY_RECEIVED,
159 PEER_STATE_KEY_CONFIRMED
164 * Number of bytes (at the beginning) of "struct EncryptedMessage"
165 * that are NOT encrypted.
167 #define ENCRYPTED_HEADER_SIZE (sizeof(struct GNUNET_MessageHeader) + sizeof(uint32_t))
171 * Encapsulation for encrypted messages exchanged between
172 * peers. Followed by the actual encrypted data.
174 struct EncryptedMessage
177 * Message type is either CORE_ENCRYPTED_MESSAGE.
179 struct GNUNET_MessageHeader header;
182 * Random value used for IV generation. ENCRYPTED_HEADER_SIZE must
183 * be set to the offset of the *next* field.
185 uint32_t iv_seed GNUNET_PACKED;
188 * Hash of the plaintext (starting at 'sequence_number'), used to
189 * verify message integrity. Everything after this hash (including
190 * this hash itself) will be encrypted.
192 GNUNET_HashCode hmac;
195 * Sequence number, in network byte order. This field
196 * must be the first encrypted/decrypted field and the
197 * first byte that is hashed for the plaintext hash.
199 uint32_t sequence_number GNUNET_PACKED;
202 * Desired bandwidth (how much we should send to this peer / how
203 * much is the sender willing to receive)?
205 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
208 * Timestamp. Used to prevent reply of ancient messages
209 * (recent messages are caught with the sequence number).
211 struct GNUNET_TIME_AbsoluteNBO timestamp;
217 * We're sending an (encrypted) PING to the other peer to check if he
218 * can decrypt. The other peer should respond with a PONG with the
219 * same content, except this time encrypted with the receiver's key.
224 * Message type is CORE_PING.
226 struct GNUNET_MessageHeader header;
229 * Random number chosen to make reply harder.
231 uint32_t challenge GNUNET_PACKED;
234 * Intended target of the PING, used primarily to check
235 * that decryption actually worked.
237 struct GNUNET_PeerIdentity target;
243 * Response to a PING. Includes data from the original PING
244 * plus initial bandwidth quota information.
249 * Message type is CORE_PONG.
251 struct GNUNET_MessageHeader header;
254 * Random number proochosen to make reply harder. Must be
255 * first field after header (this is where we start to encrypt!).
257 uint32_t challenge GNUNET_PACKED;
262 uint32_t reserved GNUNET_PACKED;
265 * Desired bandwidth (how much we should send to this
266 * peer / how much is the sender willing to receive).
268 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
271 * Intended target of the PING, used primarily to check
272 * that decryption actually worked.
274 struct GNUNET_PeerIdentity target;
279 * Message transmitted to set (or update) a session key.
285 * Message type is either CORE_SET_KEY.
287 struct GNUNET_MessageHeader header;
290 * Status of the sender (should be in "enum PeerStateMachine"), nbo.
292 int32_t sender_status GNUNET_PACKED;
295 * Purpose of the signature, will be
296 * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
298 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
301 * At what time was this key created?
303 struct GNUNET_TIME_AbsoluteNBO creation_time;
306 * The encrypted session key.
308 struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
311 * Who is the intended recipient?
313 struct GNUNET_PeerIdentity target;
316 * Signature of the stuff above (starting at purpose).
318 struct GNUNET_CRYPTO_RsaSignature signature;
324 * Message waiting for transmission. This struct
325 * is followed by the actual content of the message.
331 * We keep messages in a doubly linked list.
333 struct MessageEntry *next;
336 * We keep messages in a doubly linked list.
338 struct MessageEntry *prev;
341 * By when are we supposed to transmit this message?
343 struct GNUNET_TIME_Absolute deadline;
346 * By when are we supposed to transmit this message (after
349 struct GNUNET_TIME_Absolute slack_deadline;
352 * How important is this message to us?
354 unsigned int priority;
357 * If this is a SET_KEY message, what was our connection status when this
358 * message was queued?
360 enum PeerStateMachine sender_status;
363 * Is this a SET_KEY message?
368 * How long is the message? (number of bytes following
369 * the "struct MessageEntry", but not including the
370 * size of "struct MessageEntry" itself!)
375 * Was this message selected for transmission in the
376 * current round? GNUNET_YES or GNUNET_NO.
381 * Did we give this message some slack (delayed sending) previously
382 * (and hence should not give it any more slack)? GNUNET_YES or
393 * We keep neighbours in a linked list (for now).
395 struct Neighbour *next;
398 * Unencrypted messages destined for this peer.
400 struct MessageEntry *messages;
403 * Head of the batched, encrypted message queue (already ordered,
404 * transmit starting with the head).
406 struct MessageEntry *encrypted_head;
409 * Tail of the batched, encrypted message queue (already ordered,
410 * append new messages to tail)
412 struct MessageEntry *encrypted_tail;
415 * Handle for pending requests for transmission to this peer
416 * with the transport service. NULL if no request is pending.
418 struct GNUNET_TRANSPORT_TransmitHandle *th;
421 * Public key of the neighbour, NULL if we don't have it yet.
423 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
426 * We received a PING message before we got the "public_key"
427 * (or the SET_KEY). We keep it here until we have a key
428 * to decrypt it. NULL if no PING is pending.
430 struct PingMessage *pending_ping;
433 * We received a PONG message before we got the "public_key"
434 * (or the SET_KEY). We keep it here until we have a key
435 * to decrypt it. NULL if no PONG is pending.
437 struct PongMessage *pending_pong;
440 * Non-NULL if we are currently looking up HELLOs for this peer.
443 struct GNUNET_PEERINFO_IteratorContext *pitr;
446 * SetKeyMessage to transmit, NULL if we are not currently trying
449 struct SetKeyMessage *skm;
452 * Identity of the neighbour.
454 struct GNUNET_PeerIdentity peer;
457 * Key we use to encrypt our messages for the other peer
458 * (initialized by us when we do the handshake).
460 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
463 * Key we use to decrypt messages from the other peer
464 * (given to us by the other peer during the handshake).
466 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
469 * ID of task used for re-trying plaintext scheduling.
471 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
474 * ID of task used for re-trying SET_KEY and PING message.
476 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
479 * ID of task used for updating bandwidth quota for this neighbour.
481 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
484 * ID of task used for sending keep-alive pings.
486 GNUNET_SCHEDULER_TaskIdentifier keep_alive_task;
489 * ID of task used for cleaning up dead neighbour entries.
491 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
494 * At what time did we generate our encryption key?
496 struct GNUNET_TIME_Absolute encrypt_key_created;
499 * At what time did the other peer generate the decryption key?
501 struct GNUNET_TIME_Absolute decrypt_key_created;
504 * At what time did we initially establish (as in, complete session
505 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
507 struct GNUNET_TIME_Absolute time_established;
510 * At what time did we last receive an encrypted message from the
511 * other peer? Should be zero if status != KEY_CONFIRMED.
513 struct GNUNET_TIME_Absolute last_activity;
516 * Last latency observed from this peer.
518 struct GNUNET_TIME_Relative last_latency;
521 * At what frequency are we currently re-trying SET_KEY messages?
523 struct GNUNET_TIME_Relative set_key_retry_frequency;
526 * Tracking bandwidth for sending to this peer.
528 struct GNUNET_BANDWIDTH_Tracker available_send_window;
531 * Tracking bandwidth for receiving from this peer.
533 struct GNUNET_BANDWIDTH_Tracker available_recv_window;
536 * How valueable were the messages of this peer recently?
538 unsigned long long current_preference;
541 * Bit map indicating which of the 32 sequence numbers before the last
542 * were received (good for accepting out-of-order packets and
543 * estimating reliability of the connection)
545 unsigned int last_packets_bitmap;
548 * last sequence number received on this connection (highest)
550 uint32_t last_sequence_number_received;
553 * last sequence number transmitted
555 uint32_t last_sequence_number_sent;
558 * Available bandwidth in for this peer (current target).
560 struct GNUNET_BANDWIDTH_Value32NBO bw_in;
563 * Available bandwidth out for this peer (current target).
565 struct GNUNET_BANDWIDTH_Value32NBO bw_out;
568 * Internal bandwidth limit set for this peer (initially typically
569 * set to "-1"). Actual "bw_out" is MIN of
570 * "bpm_out_internal_limit" and "bw_out_external_limit".
572 struct GNUNET_BANDWIDTH_Value32NBO bw_out_internal_limit;
575 * External bandwidth limit set for this peer by the
576 * peer that we are communicating with. "bw_out" is MIN of
577 * "bw_out_internal_limit" and "bw_out_external_limit".
579 struct GNUNET_BANDWIDTH_Value32NBO bw_out_external_limit;
582 * What was our PING challenge number (for this peer)?
584 uint32_t ping_challenge;
587 * What was the last distance to this peer as reported by the transports?
589 uint32_t last_distance;
592 * What is our connection status?
594 enum PeerStateMachine status;
597 * Are we currently connected to this neighbour?
605 * Data structure for each client connected to the core service.
610 * Clients are kept in a linked list.
615 * Handle for the client with the server API.
617 struct GNUNET_SERVER_Client *client_handle;
620 * Array of the types of messages this peer cares
621 * about (with "tcnt" entries). Allocated as part
622 * of this client struct, do not free!
624 const uint16_t *types;
627 * Options for messages this client cares about,
628 * see GNUNET_CORE_OPTION_ values.
633 * Number of types of incoming messages this client
634 * specifically cares about. Size of the "types" array.
644 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
649 static struct GNUNET_PeerIdentity my_identity;
654 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
659 struct GNUNET_SCHEDULER_Handle *sched;
662 * Handle to peerinfo service.
664 static struct GNUNET_PEERINFO_Handle *peerinfo;
667 * Our message stream tokenizer (for encrypted payload).
669 static struct GNUNET_SERVER_MessageStreamTokenizer *mst;
674 const struct GNUNET_CONFIGURATION_Handle *cfg;
679 static struct GNUNET_TRANSPORT_Handle *transport;
682 * Linked list of our clients.
684 static struct Client *clients;
687 * Context for notifications we need to send to our clients.
689 static struct GNUNET_SERVER_NotificationContext *notifier;
692 * We keep neighbours in a linked list (for now).
694 static struct Neighbour *neighbours;
697 * For creating statistics.
699 static struct GNUNET_STATISTICS_Handle *stats;
702 * Sum of all preferences among all neighbours.
704 static unsigned long long preference_sum;
707 * Total number of neighbours we have.
709 static unsigned int neighbour_count;
712 * How much inbound bandwidth are we supposed to be using per second?
713 * FIXME: this value is not used!
715 static unsigned long long bandwidth_target_in_bps;
718 * How much outbound bandwidth are we supposed to be using per second?
720 static unsigned long long bandwidth_target_out_bps;
725 * A preference value for a neighbour was update. Update
726 * the preference sum accordingly.
728 * @param inc how much was a preference value increased?
731 update_preference_sum (unsigned long long inc)
734 unsigned long long os;
737 preference_sum += inc;
738 if (preference_sum >= os)
740 /* overflow! compensate by cutting all values in half! */
745 n->current_preference /= 2;
746 preference_sum += n->current_preference;
749 GNUNET_STATISTICS_set (stats, gettext_noop ("# total peer preference"), preference_sum, GNUNET_NO);
754 * Find the entry for the given neighbour.
756 * @param peer identity of the neighbour
757 * @return NULL if we are not connected, otherwise the
760 static struct Neighbour *
761 find_neighbour (const struct GNUNET_PeerIdentity *peer)
763 struct Neighbour *ret;
766 while ((ret != NULL) &&
767 (0 != memcmp (&ret->peer,
768 peer, sizeof (struct GNUNET_PeerIdentity))))
775 * Send a message to one of our clients.
777 * @param client target for the message
778 * @param msg message to transmit
779 * @param can_drop could this message be dropped if the
780 * client's queue is getting too large?
783 send_to_client (struct Client *client,
784 const struct GNUNET_MessageHeader *msg,
787 #if DEBUG_CORE_CLIENT
788 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
789 "Preparing to send %u bytes of message of type %u to client.\n",
790 (unsigned int) ntohs (msg->size),
791 (unsigned int) ntohs (msg->type));
793 GNUNET_SERVER_notification_context_unicast (notifier,
794 client->client_handle,
801 * Send a message to all of our current clients that have
802 * the right options set.
804 * @param msg message to multicast
805 * @param can_drop can this message be discarded if the queue is too long
806 * @param options mask to use
809 send_to_all_clients (const struct GNUNET_MessageHeader *msg,
818 if (0 != (c->options & options))
820 #if DEBUG_CORE_CLIENT
821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
822 "Sending message of type %u to client.\n",
823 (unsigned int) ntohs (msg->type));
825 send_to_client (c, msg, can_drop);
833 * Function called by transport telling us that a peer
836 * @param peer the peer that changed status
839 handle_peer_status_change (struct Neighbour *n)
841 struct PeerStatusNotifyMessage psnm;
843 if (! n->is_connected)
846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
847 "Peer `%4s' changed status\n",
850 psnm.header.size = htons (sizeof (struct PeerStatusNotifyMessage));
851 psnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE);
852 psnm.distance = htonl (n->last_distance);
853 psnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
854 psnm.timeout = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_add (n->last_activity,
855 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
856 psnm.bandwidth_in = n->bw_in;
857 psnm.bandwidth_out = n->bw_out;
859 send_to_all_clients (&psnm.header,
861 GNUNET_CORE_OPTION_SEND_STATUS_CHANGE);
862 GNUNET_STATISTICS_update (stats,
863 gettext_noop ("# peer status changes"),
870 * Handle CORE_INIT request.
873 handle_client_init (void *cls,
874 struct GNUNET_SERVER_Client *client,
875 const struct GNUNET_MessageHeader *message)
877 const struct InitMessage *im;
878 struct InitReplyMessage irm;
881 const uint16_t *types;
884 struct ConnectNotifyMessage cnm;
887 #if DEBUG_CORE_CLIENT
888 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
889 "Client connecting to core service with `%s' message\n",
892 /* check that we don't have an entry already */
896 if (client == c->client_handle)
899 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
904 msize = ntohs (message->size);
905 if (msize < sizeof (struct InitMessage))
908 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
911 GNUNET_SERVER_notification_context_add (notifier, client);
912 im = (const struct InitMessage *) message;
913 types = (const uint16_t *) &im[1];
914 msize -= sizeof (struct InitMessage);
915 c = GNUNET_malloc (sizeof (struct Client) + msize);
916 c->client_handle = client;
919 c->tcnt = msize / sizeof (uint16_t);
920 c->types = (const uint16_t *) &c[1];
921 wtypes = (uint16_t *) &c[1];
922 for (i=0;i<c->tcnt;i++)
923 wtypes[i] = ntohs (types[i]);
924 c->options = ntohl (im->options);
925 #if DEBUG_CORE_CLIENT
926 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
927 "Client %p is interested in %u message types\n",
929 (unsigned int) c->tcnt);
931 /* send init reply message */
932 irm.header.size = htons (sizeof (struct InitReplyMessage));
933 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
934 irm.reserved = htonl (0);
935 memcpy (&irm.publicKey,
937 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
938 #if DEBUG_CORE_CLIENT
939 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
940 "Sending `%s' message to client.\n", "INIT_REPLY");
942 send_to_client (c, &irm.header, GNUNET_NO);
943 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
945 /* notify new client about existing neighbours */
946 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
947 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
951 if (n->status == PEER_STATE_KEY_CONFIRMED)
953 #if DEBUG_CORE_CLIENT
954 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
955 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
957 cnm.distance = htonl (n->last_distance);
958 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
960 send_to_client (c, &cnm.header, GNUNET_NO);
965 GNUNET_SERVER_receive_done (client, GNUNET_OK);
970 * A client disconnected, clean up.
973 * @param client identification of the client
976 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
983 #if DEBUG_CORE_CLIENT
984 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
985 "Client %p has disconnected from core service.\n",
992 if (client == pos->client_handle)
997 prev->next = pos->next;
1004 /* client never sent INIT */
1009 * Handle REQUEST_INFO request.
1012 handle_client_request_info (void *cls,
1013 struct GNUNET_SERVER_Client *client,
1014 const struct GNUNET_MessageHeader *message)
1016 const struct RequestInfoMessage *rcm;
1017 struct Neighbour *n;
1018 struct ConfigurationInfoMessage cim;
1019 int32_t want_reserv;
1021 unsigned long long old_preference;
1022 struct GNUNET_SERVER_TransmitContext *tc;
1024 #if DEBUG_CORE_CLIENT
1025 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1026 "Core service receives `%s' request.\n", "REQUEST_INFO");
1028 rcm = (const struct RequestInfoMessage *) message;
1029 n = find_neighbour (&rcm->peer);
1030 memset (&cim, 0, sizeof (cim));
1033 want_reserv = ntohl (rcm->reserve_inbound);
1034 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
1036 n->bw_out_internal_limit = rcm->limit_outbound;
1037 if (n->bw_out.value__ != GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1038 n->bw_out_external_limit).value__)
1040 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1041 n->bw_out_external_limit);
1042 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1044 GNUNET_TRANSPORT_set_quota (transport,
1048 GNUNET_TIME_UNIT_FOREVER_REL,
1050 handle_peer_status_change (n);
1053 if (want_reserv < 0)
1055 got_reserv = want_reserv;
1057 else if (want_reserv > 0)
1059 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1060 want_reserv).value == 0)
1061 got_reserv = want_reserv;
1063 got_reserv = 0; /* all or nothing */
1067 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1069 old_preference = n->current_preference;
1070 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1071 if (old_preference > n->current_preference)
1073 /* overflow; cap at maximum value */
1074 n->current_preference = ULLONG_MAX;
1076 update_preference_sum (n->current_preference - old_preference);
1077 #if DEBUG_CORE_QUOTA
1078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1079 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1081 GNUNET_i2s (&rcm->peer),
1084 cim.reserved_amount = htonl (got_reserv);
1085 cim.bw_in = n->bw_in;
1086 cim.bw_out = n->bw_out;
1087 cim.preference = n->current_preference;
1089 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1090 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1091 cim.peer = rcm->peer;
1093 #if DEBUG_CORE_CLIENT
1094 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1095 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1097 tc = GNUNET_SERVER_transmit_context_create (client);
1098 GNUNET_SERVER_transmit_context_append_message (tc, &cim.header);
1099 GNUNET_SERVER_transmit_context_run (tc,
1100 GNUNET_TIME_UNIT_FOREVER_REL);
1105 * Free the given entry for the neighbour (it has
1106 * already been removed from the list at this point).
1108 * @param n neighbour to free
1111 free_neighbour (struct Neighbour *n)
1113 struct MessageEntry *m;
1116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1117 "Destroying neighbour entry for peer `%4s'\n",
1118 GNUNET_i2s (&n->peer));
1120 if (n->pitr != NULL)
1122 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1127 GNUNET_free (n->skm);
1130 while (NULL != (m = n->messages))
1132 n->messages = m->next;
1135 while (NULL != (m = n->encrypted_head))
1137 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1144 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1147 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1148 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1149 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1150 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
1151 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1152 GNUNET_SCHEDULER_cancel (sched, n->quota_update_task);
1153 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1154 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1155 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1156 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
1157 if (n->status == PEER_STATE_KEY_CONFIRMED)
1158 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), -1, GNUNET_NO);
1159 GNUNET_free_non_null (n->public_key);
1160 GNUNET_free_non_null (n->pending_ping);
1161 GNUNET_free_non_null (n->pending_pong);
1167 * Check if we have encrypted messages for the specified neighbour
1168 * pending, and if so, check with the transport about sending them
1171 * @param n neighbour to check.
1173 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1177 * Encrypt size bytes from in and write the result to out. Use the
1178 * key for outbound traffic of the given neighbour.
1180 * @param n neighbour we are sending to
1181 * @param iv initialization vector to use
1182 * @param in ciphertext
1183 * @param out plaintext
1184 * @param size size of in/out
1185 * @return GNUNET_OK on success
1188 do_encrypt (struct Neighbour *n,
1189 const GNUNET_HashCode * iv,
1190 const void *in, void *out, size_t size)
1192 if (size != (uint16_t) size)
1197 GNUNET_assert (size ==
1198 GNUNET_CRYPTO_aes_encrypt (in,
1202 GNUNET_CRYPTO_AesInitializationVector
1204 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1206 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1207 "Encrypted %u bytes for `%4s' using key %u\n",
1208 (unsigned int) size,
1209 GNUNET_i2s (&n->peer),
1210 (unsigned int) n->encrypt_key.crc32);
1217 * Consider freeing the given neighbour since we may not need
1218 * to keep it around anymore.
1220 * @param n neighbour to consider discarding
1223 consider_free_neighbour (struct Neighbour *n);
1227 * Task triggered when a neighbour entry is about to time out
1228 * (and we should prevent this by sending a PING).
1230 * @param cls the 'struct Neighbour'
1231 * @param tc scheduler context (not used)
1234 send_keep_alive (void *cls,
1235 const struct GNUNET_SCHEDULER_TaskContext *tc)
1237 struct Neighbour *n = cls;
1238 struct GNUNET_TIME_Relative retry;
1239 struct GNUNET_TIME_Relative left;
1240 struct MessageEntry *me;
1241 struct PingMessage pp;
1242 struct PingMessage *pm;
1244 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1246 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1247 sizeof (struct PingMessage));
1248 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1249 me->priority = PING_PRIORITY;
1250 me->size = sizeof (struct PingMessage);
1251 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1255 pm = (struct PingMessage *) &me[1];
1256 pm->header.size = htons (sizeof (struct PingMessage));
1257 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1258 pp.challenge = htonl (n->ping_challenge);
1259 pp.target = n->peer;
1261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1262 "Encrypting `%s' message with challenge %u for `%4s' using key %u.\n",
1264 (unsigned int) n->ping_challenge,
1265 GNUNET_i2s (&n->peer),
1266 (unsigned int) n->encrypt_key.crc32);
1269 &n->peer.hashPubKey,
1272 sizeof (struct PingMessage) -
1273 sizeof (struct GNUNET_MessageHeader));
1274 process_encrypted_neighbour_queue (n);
1275 /* reschedule PING job */
1276 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1277 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1278 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1279 MIN_PING_FREQUENCY);
1281 = GNUNET_SCHEDULER_add_delayed (sched,
1290 * Task triggered when a neighbour entry might have gotten stale.
1292 * @param cls the 'struct Neighbour'
1293 * @param tc scheduler context (not used)
1296 consider_free_task (void *cls,
1297 const struct GNUNET_SCHEDULER_TaskContext *tc)
1299 struct Neighbour *n = cls;
1301 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1302 consider_free_neighbour (n);
1307 * Consider freeing the given neighbour since we may not need
1308 * to keep it around anymore.
1310 * @param n neighbour to consider discarding
1313 consider_free_neighbour (struct Neighbour *n)
1315 struct Neighbour *pos;
1316 struct Neighbour *prev;
1317 struct GNUNET_TIME_Relative left;
1319 if ( (n->th != NULL) ||
1320 (n->pitr != NULL) ||
1321 (n->status == PEER_STATE_KEY_CONFIRMED) ||
1322 (GNUNET_YES == n->is_connected) )
1323 return; /* no chance */
1325 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1326 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1329 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1330 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1331 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
1333 &consider_free_task,
1337 /* actually free the neighbour... */
1346 neighbours = n->next;
1348 prev->next = n->next;
1349 GNUNET_assert (neighbour_count > 0);
1351 GNUNET_STATISTICS_set (stats,
1352 gettext_noop ("# neighbour entries allocated"),
1360 * Function called when the transport service is ready to
1361 * receive an encrypted message for the respective peer
1363 * @param cls neighbour to use message from
1364 * @param size number of bytes we can transmit
1365 * @param buf where to copy the message
1366 * @return number of bytes transmitted
1369 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1371 struct Neighbour *n = cls;
1372 struct MessageEntry *m;
1377 m = n->encrypted_head;
1381 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1382 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1383 GNUNET_i2s (&n->peer));
1387 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1394 GNUNET_assert (size >= m->size);
1395 memcpy (cbuf, &m[1], m->size);
1397 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1400 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1401 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1402 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1404 GNUNET_i2s (&n->peer));
1406 process_encrypted_neighbour_queue (n);
1411 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1412 "Transmission of message of type %u and size %u failed\n",
1413 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1414 (unsigned int) m->size);
1418 consider_free_neighbour (n);
1424 * Check if we have plaintext messages for the specified neighbour
1425 * pending, and if so, consider batching and encrypting them (and
1426 * then trigger processing of the encrypted queue if needed).
1428 * @param n neighbour to check.
1430 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1434 * Check if we have encrypted messages for the specified neighbour
1435 * pending, and if so, check with the transport about sending them
1438 * @param n neighbour to check.
1441 process_encrypted_neighbour_queue (struct Neighbour *n)
1443 struct MessageEntry *m;
1446 return; /* request already pending */
1447 m = n->encrypted_head;
1450 /* encrypted queue empty, try plaintext instead */
1451 process_plaintext_neighbour_queue (n);
1455 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1456 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1457 (unsigned int) m->size,
1458 GNUNET_i2s (&n->peer),
1459 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).
1463 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1466 GNUNET_TIME_absolute_get_remaining
1468 ¬ify_encrypted_transmit_ready,
1472 /* message request too large or duplicate request */
1474 /* discard encrypted message */
1475 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1479 process_encrypted_neighbour_queue (n);
1485 * Decrypt size bytes from in and write the result to out. Use the
1486 * key for inbound traffic of the given neighbour. This function does
1487 * NOT do any integrity-checks on the result.
1489 * @param n neighbour we are receiving from
1490 * @param iv initialization vector to use
1491 * @param in ciphertext
1492 * @param out plaintext
1493 * @param size size of in/out
1494 * @return GNUNET_OK on success
1497 do_decrypt (struct Neighbour *n,
1498 const GNUNET_HashCode * iv,
1499 const void *in, void *out, size_t size)
1501 if (size != (uint16_t) size)
1506 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1507 (n->status != PEER_STATE_KEY_CONFIRMED))
1509 GNUNET_break_op (0);
1510 return GNUNET_SYSERR;
1513 GNUNET_CRYPTO_aes_decrypt (in,
1517 GNUNET_CRYPTO_AesInitializationVector *) iv,
1521 return GNUNET_SYSERR;
1523 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes decrypted"), size, GNUNET_NO);
1525 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1526 "Decrypted %u bytes from `%4s' using key %u\n",
1527 (unsigned int) size,
1528 GNUNET_i2s (&n->peer),
1529 (unsigned int) n->decrypt_key.crc32);
1536 * Select messages for transmission. This heuristic uses a combination
1537 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1538 * and priority-based discard (in case no feasible schedule exist) and
1539 * speculative optimization (defer any kind of transmission until
1540 * we either create a batch of significant size, 25% of max, or until
1541 * we are close to a deadline). Furthermore, when scheduling the
1542 * heuristic also packs as many messages into the batch as possible,
1543 * starting with those with the earliest deadline. Yes, this is fun.
1545 * @param n neighbour to select messages from
1546 * @param size number of bytes to select for transmission
1547 * @param retry_time set to the time when we should try again
1548 * (only valid if this function returns zero)
1549 * @return number of bytes selected, or 0 if we decided to
1550 * defer scheduling overall; in that case, retry_time is set.
1553 select_messages (struct Neighbour *n,
1554 size_t size, struct GNUNET_TIME_Relative *retry_time)
1556 struct MessageEntry *pos;
1557 struct MessageEntry *min;
1558 struct MessageEntry *last;
1559 unsigned int min_prio;
1560 struct GNUNET_TIME_Absolute t;
1561 struct GNUNET_TIME_Absolute now;
1562 struct GNUNET_TIME_Relative delta;
1564 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
1567 unsigned int queue_size;
1568 int discard_low_prio;
1570 GNUNET_assert (NULL != n->messages);
1571 now = GNUNET_TIME_absolute_get ();
1572 /* last entry in linked list of messages processed */
1574 /* should we remove the entry with the lowest
1575 priority from consideration for scheduling at the
1586 discard_low_prio = GNUNET_YES;
1587 while (GNUNET_YES == discard_low_prio)
1590 min_prio = UINT_MAX;
1591 discard_low_prio = GNUNET_NO;
1592 /* calculate number of bytes available for transmission at time "t" */
1593 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
1595 /* how many bytes have we (hypothetically) scheduled so far */
1597 /* maximum time we can wait before transmitting anything
1598 and still make all of our deadlines */
1599 slack = GNUNET_TIME_UNIT_FOREVER_REL;
1601 /* note that we use "*2" here because we want to look
1602 a bit further into the future; much more makes no
1603 sense since new message might be scheduled in the
1605 while ((pos != NULL) && (off < size * 2))
1607 if (pos->do_transmit == GNUNET_YES)
1609 /* already removed from consideration */
1613 if (discard_low_prio == GNUNET_NO)
1615 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
1616 if (delta.value > 0)
1618 // FIXME: HUH? Check!
1620 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
1623 if (avail < pos->size)
1625 // FIXME: HUH? Check!
1626 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1631 /* update slack, considering both its absolute deadline
1632 and relative deadlines caused by other messages
1633 with their respective load */
1634 slack = GNUNET_TIME_relative_min (slack,
1635 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
1637 if (pos->deadline.value <= now.value)
1640 slack = GNUNET_TIME_UNIT_ZERO;
1642 else if (GNUNET_YES == pos->got_slack)
1644 /* should be soon now! */
1645 slack = GNUNET_TIME_relative_min (slack,
1646 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
1651 GNUNET_TIME_relative_min (slack,
1652 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
1653 pos->got_slack = GNUNET_YES;
1654 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
1655 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
1660 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
1661 if (pos->priority <= min_prio)
1663 /* update min for discard */
1664 min_prio = pos->priority;
1669 if (discard_low_prio)
1671 GNUNET_assert (min != NULL);
1672 /* remove lowest-priority entry from consideration */
1673 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1677 /* guard against sending "tiny" messages with large headers without
1679 if ( (slack.value > GNUNET_CONSTANTS_MAX_CORK_DELAY.value) &&
1681 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
1683 /* less than 25% of message would be filled with deadlines still
1684 being met if we delay by one second or more; so just wait for
1685 more data; but do not wait longer than 1s (since we don't want
1686 to delay messages for a really long time either). */
1687 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
1688 /* reset do_transmit values for next time */
1691 pos->do_transmit = GNUNET_NO;
1695 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1696 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
1697 (unsigned long long) retry_time->value,
1699 (unsigned int) size);
1703 /* select marked messages (up to size) for transmission */
1708 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
1710 pos->do_transmit = GNUNET_YES; /* mark for transmission */
1714 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1715 "Selecting message of size %u for transmission\n",
1716 (unsigned int) pos->size);
1722 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1723 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
1724 (unsigned int) pos->size,
1727 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
1732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1733 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
1734 (unsigned long long) off, (unsigned long long) tsize,
1735 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
1736 GNUNET_i2s (&n->peer));
1743 * Batch multiple messages into a larger buffer.
1745 * @param n neighbour to take messages from
1746 * @param buf target buffer
1747 * @param size size of buf
1748 * @param deadline set to transmission deadline for the result
1749 * @param retry_time set to the time when we should try again
1750 * (only valid if this function returns zero)
1751 * @param priority set to the priority of the batch
1752 * @return number of bytes written to buf (can be zero)
1755 batch_message (struct Neighbour *n,
1758 struct GNUNET_TIME_Absolute *deadline,
1759 struct GNUNET_TIME_Relative *retry_time,
1760 unsigned int *priority)
1762 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1763 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
1764 struct MessageEntry *pos;
1765 struct MessageEntry *prev;
1766 struct MessageEntry *next;
1771 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1772 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
1773 if (0 == select_messages (n, size, retry_time))
1776 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1777 "No messages selected, will try again in %llu ms\n",
1782 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
1783 ntm->distance = htonl (n->last_distance);
1784 ntm->latency = GNUNET_TIME_relative_hton (n->last_latency);
1785 ntm->peer = n->peer;
1788 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
1791 if (GNUNET_YES == pos->do_transmit)
1793 GNUNET_assert (pos->size <= size);
1794 /* do notifications */
1795 /* FIXME: track if we have *any* client that wants
1796 full notifications and only do this if that is
1798 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
1800 memcpy (&ntm[1], &pos[1], pos->size);
1801 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1802 sizeof (struct GNUNET_MessageHeader));
1803 send_to_all_clients (&ntm->header,
1805 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
1809 /* message too large for 'full' notifications, we do at
1810 least the 'hdr' type */
1813 sizeof (struct GNUNET_MessageHeader));
1815 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1817 send_to_all_clients (&ntm->header,
1819 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
1821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1822 "Encrypting %u bytes with message of type %u and size %u\n",
1824 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
1825 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
1827 /* copy for encrypted transmission */
1828 memcpy (&buf[ret], &pos[1], pos->size);
1831 *priority += pos->priority;
1833 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1834 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
1835 (unsigned int) pos->size,
1836 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).value);
1838 deadline->value = GNUNET_MIN (deadline->value, pos->deadline.value);
1852 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1853 "Deadline for message batch is %llu ms\n",
1854 GNUNET_TIME_absolute_get_remaining (*deadline).value);
1861 * Remove messages with deadlines that have long expired from
1864 * @param n neighbour to inspect
1867 discard_expired_messages (struct Neighbour *n)
1869 struct MessageEntry *prev;
1870 struct MessageEntry *next;
1871 struct MessageEntry *pos;
1872 struct GNUNET_TIME_Absolute now;
1873 struct GNUNET_TIME_Relative delta;
1875 now = GNUNET_TIME_absolute_get ();
1881 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
1882 if (delta.value > PAST_EXPIRATION_DISCARD_TIME.value)
1885 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1886 "Message is %llu ms past due, discarding.\n",
1903 * Signature of the main function of a task.
1905 * @param cls closure
1906 * @param tc context information (why was this task triggered now)
1909 retry_plaintext_processing (void *cls,
1910 const struct GNUNET_SCHEDULER_TaskContext *tc)
1912 struct Neighbour *n = cls;
1914 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1915 process_plaintext_neighbour_queue (n);
1920 * Send our key (and encrypted PING) to the other peer.
1922 * @param n the other peer
1924 static void send_key (struct Neighbour *n);
1927 * Task that will retry "send_key" if our previous attempt failed
1931 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1933 struct Neighbour *n = cls;
1936 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1937 "Retrying key transmission to `%4s'\n",
1938 GNUNET_i2s (&n->peer));
1940 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
1941 n->set_key_retry_frequency =
1942 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
1948 * Check if we have plaintext messages for the specified neighbour
1949 * pending, and if so, consider batching and encrypting them (and
1950 * then trigger processing of the encrypted queue if needed).
1952 * @param n neighbour to check.
1955 process_plaintext_neighbour_queue (struct Neighbour *n)
1957 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
1960 struct EncryptedMessage *em; /* encrypted message */
1961 struct EncryptedMessage *ph; /* plaintext header */
1962 struct MessageEntry *me;
1963 unsigned int priority;
1964 struct GNUNET_TIME_Absolute deadline;
1965 struct GNUNET_TIME_Relative retry_time;
1968 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1970 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1971 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1975 case PEER_STATE_DOWN:
1978 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1979 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1980 GNUNET_i2s(&n->peer));
1983 case PEER_STATE_KEY_SENT:
1984 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1985 n->retry_set_key_task
1986 = GNUNET_SCHEDULER_add_delayed (sched,
1987 n->set_key_retry_frequency,
1988 &set_key_retry_task, n);
1990 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1991 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1992 GNUNET_i2s(&n->peer));
1995 case PEER_STATE_KEY_RECEIVED:
1996 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1997 n->retry_set_key_task
1998 = GNUNET_SCHEDULER_add_delayed (sched,
1999 n->set_key_retry_frequency,
2000 &set_key_retry_task, n);
2002 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2003 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
2004 GNUNET_i2s(&n->peer));
2007 case PEER_STATE_KEY_CONFIRMED:
2008 /* ready to continue */
2011 discard_expired_messages (n);
2012 if (n->messages == NULL)
2015 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2016 "Plaintext message queue for `%4s' is empty.\n",
2017 GNUNET_i2s(&n->peer));
2019 return; /* no pending messages */
2021 if (n->encrypted_head != NULL)
2024 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2025 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
2026 GNUNET_i2s(&n->peer));
2028 return; /* wait for messages already encrypted to be
2031 ph = (struct EncryptedMessage *) pbuf;
2032 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
2034 used = sizeof (struct EncryptedMessage);
2035 used += batch_message (n,
2037 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
2038 &deadline, &retry_time, &priority);
2039 if (used == sizeof (struct EncryptedMessage))
2042 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2043 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2044 GNUNET_i2s(&n->peer));
2046 /* no messages selected for sending, try again later... */
2047 n->retry_plaintext_task =
2048 GNUNET_SCHEDULER_add_delayed (sched,
2050 &retry_plaintext_processing, n);
2053 #if DEBUG_CORE_QUOTA
2054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2055 "Sending %u b/s as new limit to peer `%4s'\n",
2056 (unsigned int) ntohl (n->bw_in.value__),
2057 GNUNET_i2s (&n->peer));
2059 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX));
2060 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2061 ph->inbound_bw_limit = n->bw_in;
2062 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2064 /* setup encryption message header */
2065 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2066 me->deadline = deadline;
2067 me->priority = priority;
2069 em = (struct EncryptedMessage *) &me[1];
2070 em->header.size = htons (used);
2071 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2072 em->iv_seed = ph->iv_seed;
2073 esize = used - ENCRYPTED_HEADER_SIZE;
2074 GNUNET_CRYPTO_hmac (&n->encrypt_key,
2075 &ph->sequence_number,
2076 esize - sizeof (GNUNET_HashCode),
2078 GNUNET_CRYPTO_hash (&ph->iv_seed, sizeof (uint32_t), &iv);
2080 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2081 "Hashed %u bytes of plaintext (`%s') using IV `%d'\n",
2082 (unsigned int) (esize - sizeof (GNUNET_HashCode)),
2083 GNUNET_h2s (&ph->hmac),
2088 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2089 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2090 (unsigned int) esize,
2091 GNUNET_i2s(&n->peer),
2092 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).value);
2094 GNUNET_assert (GNUNET_OK ==
2099 /* append to transmission list */
2100 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2104 process_encrypted_neighbour_queue (n);
2109 * Function that recalculates the bandwidth quota for the
2110 * given neighbour and transmits it to the transport service.
2112 * @param cls neighbour for the quota update
2116 neighbour_quota_update (void *cls,
2117 const struct GNUNET_SCHEDULER_TaskContext *tc);
2121 * Schedule the task that will recalculate the bandwidth
2122 * quota for this peer (and possibly force a disconnect of
2123 * idle peers by calculating a bandwidth of zero).
2126 schedule_quota_update (struct Neighbour *n)
2128 GNUNET_assert (n->quota_update_task ==
2129 GNUNET_SCHEDULER_NO_TASK);
2130 n->quota_update_task
2131 = GNUNET_SCHEDULER_add_delayed (sched,
2132 QUOTA_UPDATE_FREQUENCY,
2133 &neighbour_quota_update,
2139 * Initialize a new 'struct Neighbour'.
2141 * @param pid ID of the new neighbour
2142 * @return handle for the new neighbour
2144 static struct Neighbour *
2145 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2147 struct Neighbour *n;
2148 struct GNUNET_TIME_Absolute now;
2151 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2152 "Creating neighbour entry for peer `%4s'\n",
2155 n = GNUNET_malloc (sizeof (struct Neighbour));
2156 n->next = neighbours;
2159 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
2161 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2162 now = GNUNET_TIME_absolute_get ();
2163 n->encrypt_key_created = now;
2164 n->last_activity = now;
2165 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2166 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2167 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2168 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2169 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2170 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2172 neighbour_quota_update (n, NULL);
2173 consider_free_neighbour (n);
2179 * Handle CORE_SEND request.
2182 * @param client the client issuing the request
2183 * @param message the "struct SendMessage"
2186 handle_client_send (void *cls,
2187 struct GNUNET_SERVER_Client *client,
2188 const struct GNUNET_MessageHeader *message)
2190 const struct SendMessage *sm;
2191 struct Neighbour *n;
2192 struct MessageEntry *prev;
2193 struct MessageEntry *pos;
2194 struct MessageEntry *e;
2195 struct MessageEntry *min_prio_entry;
2196 struct MessageEntry *min_prio_prev;
2197 unsigned int min_prio;
2198 unsigned int queue_size;
2201 msize = ntohs (message->size);
2203 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2207 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2210 sm = (const struct SendMessage *) message;
2211 msize -= sizeof (struct SendMessage);
2212 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2214 /* FIXME: should we not allow loopback-injection here? */
2217 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2220 n = find_neighbour (&sm->peer);
2222 n = create_neighbour (&sm->peer);
2224 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2225 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2227 (unsigned int) msize,
2228 GNUNET_i2s (&sm->peer));
2230 /* bound queue size */
2231 discard_expired_messages (n);
2232 min_prio = UINT32_MAX;
2233 min_prio_entry = NULL;
2234 min_prio_prev = NULL;
2240 if (pos->priority < min_prio)
2242 min_prio_entry = pos;
2243 min_prio_prev = prev;
2244 min_prio = pos->priority;
2250 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2253 if (ntohl(sm->priority) <= min_prio)
2255 /* discard new entry */
2257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2258 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2260 (unsigned int) MAX_PEER_QUEUE_SIZE,
2261 (unsigned int) msize,
2262 (unsigned int) ntohs (message->type));
2265 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2268 /* discard "min_prio_entry" */
2270 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2271 "Queue full, discarding existing older request\n");
2273 if (min_prio_prev == NULL)
2274 n->messages = min_prio_entry->next;
2276 min_prio_prev->next = min_prio_entry->next;
2277 GNUNET_free (min_prio_entry);
2281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2282 "Adding transmission request for `%4s' of size %u to queue\n",
2283 GNUNET_i2s (&sm->peer),
2284 (unsigned int) msize);
2286 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2287 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2288 e->priority = ntohl (sm->priority);
2290 memcpy (&e[1], &sm[1], msize);
2292 /* insert, keep list sorted by deadline */
2295 while ((pos != NULL) && (pos->deadline.value < e->deadline.value))
2306 /* consider scheduling now */
2307 process_plaintext_neighbour_queue (n);
2309 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2314 * Function called when the transport service is ready to
2315 * receive a message. Only resets 'n->th' to NULL.
2317 * @param cls neighbour to use message from
2318 * @param size number of bytes we can transmit
2319 * @param buf where to copy the message
2320 * @return number of bytes transmitted
2323 notify_transport_connect_done (void *cls, size_t size, void *buf)
2325 struct Neighbour *n = cls;
2330 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2331 _("Failed to connect to `%4s': transport failed to connect\n"),
2332 GNUNET_i2s (&n->peer));
2335 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2336 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2337 GNUNET_i2s (&n->peer));
2338 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2339 GNUNET_SCHEDULER_cancel (sched,
2340 n->retry_set_key_task);
2341 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (sched,
2342 &set_key_retry_task,
2349 * Handle CORE_REQUEST_CONNECT request.
2352 * @param client the client issuing the request
2353 * @param message the "struct ConnectMessage"
2356 handle_client_request_connect (void *cls,
2357 struct GNUNET_SERVER_Client *client,
2358 const struct GNUNET_MessageHeader *message)
2360 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2361 struct Neighbour *n;
2362 struct GNUNET_TIME_Relative timeout;
2364 if (0 == memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2367 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2370 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2371 n = find_neighbour (&cm->peer);
2373 n = create_neighbour (&cm->peer);
2374 if ( (GNUNET_YES == n->is_connected) ||
2376 return; /* already connected, or at least trying */
2377 GNUNET_STATISTICS_update (stats, gettext_noop ("# connection requests received"), 1, GNUNET_NO);
2379 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2380 "Core received `%s' request for `%4s', will try to establish connection\n",
2382 GNUNET_i2s (&cm->peer));
2384 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2385 /* ask transport to connect to the peer */
2386 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2388 sizeof (struct GNUNET_MessageHeader), 0,
2390 ¬ify_transport_connect_done,
2392 GNUNET_break (NULL != n->th);
2397 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2398 * the neighbour's struct and retry send_key. Or, if we did not get a
2399 * HELLO, just do nothing.
2401 * @param cls the 'struct Neighbour' to retry sending the key for
2402 * @param peer the peer for which this is the HELLO
2403 * @param hello HELLO message of that peer
2406 process_hello_retry_send_key (void *cls,
2407 const struct GNUNET_PeerIdentity *peer,
2408 const struct GNUNET_HELLO_Message *hello)
2410 struct Neighbour *n = cls;
2415 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2416 "Entered `%s' and `%s' is NULL!\n",
2417 "process_hello_retry_send_key",
2421 if (n->public_key != NULL)
2423 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2425 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2426 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2428 GNUNET_STATISTICS_update (stats,
2429 gettext_noop ("# SET_KEY messages deferred (need public key)"),
2437 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2438 "Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n",
2439 GNUNET_i2s (&n->peer));
2441 GNUNET_STATISTICS_update (stats,
2442 gettext_noop ("# Delayed connecting due to lack of public key"),
2445 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2446 n->retry_set_key_task
2447 = GNUNET_SCHEDULER_add_delayed (sched,
2448 n->set_key_retry_frequency,
2449 &set_key_retry_task, n);
2455 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2456 "Entered `%s' for peer `%4s'\n",
2457 "process_hello_retry_send_key",
2460 if (n->public_key != NULL)
2462 /* already have public key, why are we here? */
2468 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2469 "Received new `%s' message for `%4s', initiating key exchange.\n",
2474 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2475 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2477 GNUNET_STATISTICS_update (stats,
2478 gettext_noop ("# Error extracting public key from HELLO"),
2481 GNUNET_free (n->public_key);
2482 n->public_key = NULL;
2484 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2485 "GNUNET_HELLO_get_key returned awfully\n");
2493 * Send our key (and encrypted PING) to the other peer.
2495 * @param n the other peer
2498 send_key (struct Neighbour *n)
2500 struct MessageEntry *pos;
2501 struct SetKeyMessage *sm;
2502 struct MessageEntry *me;
2503 struct PingMessage pp;
2504 struct PingMessage *pm;
2506 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2508 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2509 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2511 if (n->pitr != NULL)
2514 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2515 "Key exchange in progress with `%4s'.\n",
2516 GNUNET_i2s (&n->peer));
2518 return; /* already in progress */
2520 if (GNUNET_YES != n->is_connected)
2523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2524 "Not yet connected to peer `%4s'!\n",
2525 GNUNET_i2s (&n->peer));
2529 GNUNET_STATISTICS_update (stats,
2530 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
2533 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2535 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
2537 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2538 ¬ify_encrypted_transmit_ready,
2544 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2545 "Asked to perform key exchange with `%4s'.\n",
2546 GNUNET_i2s (&n->peer));
2548 if (n->public_key == NULL)
2550 /* lookup n's public key, then try again */
2552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2553 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2554 GNUNET_i2s (&n->peer));
2556 GNUNET_assert (n->pitr == NULL);
2557 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
2559 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2560 &process_hello_retry_send_key, n);
2563 pos = n->encrypted_head;
2566 if (GNUNET_YES == pos->is_setkey)
2568 if (pos->sender_status == n->status)
2571 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2572 "`%s' message for `%4s' queued already\n",
2574 GNUNET_i2s (&n->peer));
2576 goto trigger_processing;
2578 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
2583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2584 "Removing queued `%s' message for `%4s', will create a new one\n",
2586 GNUNET_i2s (&n->peer));
2596 case PEER_STATE_DOWN:
2597 n->status = PEER_STATE_KEY_SENT;
2599 case PEER_STATE_KEY_SENT:
2601 case PEER_STATE_KEY_RECEIVED:
2603 case PEER_STATE_KEY_CONFIRMED:
2611 /* first, set key message */
2612 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2613 sizeof (struct SetKeyMessage) +
2614 sizeof (struct PingMessage));
2615 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
2616 me->priority = SET_KEY_PRIORITY;
2617 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
2618 me->is_setkey = GNUNET_YES;
2619 me->got_slack = GNUNET_YES; /* do not defer this one! */
2620 me->sender_status = n->status;
2621 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2625 sm = (struct SetKeyMessage *) &me[1];
2626 sm->header.size = htons (sizeof (struct SetKeyMessage));
2627 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
2628 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
2629 PEER_STATE_KEY_SENT : n->status));
2631 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2632 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2633 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2634 sizeof (struct GNUNET_PeerIdentity));
2635 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
2636 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
2637 sm->target = n->peer;
2638 GNUNET_assert (GNUNET_OK ==
2639 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
2641 GNUNET_CRYPTO_AesSessionKey),
2643 &sm->encrypted_key));
2644 GNUNET_assert (GNUNET_OK ==
2645 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
2647 pm = (struct PingMessage *) &sm[1];
2648 pm->header.size = htons (sizeof (struct PingMessage));
2649 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
2650 pp.challenge = htonl (n->ping_challenge);
2651 pp.target = n->peer;
2653 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2654 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u.\n",
2656 (unsigned int) n->ping_challenge,
2657 GNUNET_i2s (&n->peer),
2658 (unsigned int) n->encrypt_key.crc32);
2661 &n->peer.hashPubKey,
2664 sizeof (struct PingMessage) -
2665 sizeof (struct GNUNET_MessageHeader));
2666 GNUNET_STATISTICS_update (stats,
2667 gettext_noop ("# SET_KEY and PING messages created"),
2671 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2672 "Have %llu ms left for `%s' transmission.\n",
2673 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).value,
2677 /* trigger queue processing */
2678 process_encrypted_neighbour_queue (n);
2679 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
2680 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
2681 n->retry_set_key_task
2682 = GNUNET_SCHEDULER_add_delayed (sched,
2683 n->set_key_retry_frequency,
2684 &set_key_retry_task, n);
2689 * We received a SET_KEY message. Validate and update
2690 * our key material and status.
2692 * @param n the neighbour from which we received message m
2693 * @param m the set key message we received
2696 handle_set_key (struct Neighbour *n,
2697 const struct SetKeyMessage *m);
2701 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2702 * the neighbour's struct and retry handling the set_key message. Or,
2703 * if we did not get a HELLO, just free the set key message.
2705 * @param cls pointer to the set key message
2706 * @param peer the peer for which this is the HELLO
2707 * @param hello HELLO message of that peer
2710 process_hello_retry_handle_set_key (void *cls,
2711 const struct GNUNET_PeerIdentity *peer,
2712 const struct GNUNET_HELLO_Message *hello)
2714 struct Neighbour *n = cls;
2715 struct SetKeyMessage *sm = n->skm;
2721 if (n->public_key != NULL)
2724 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2725 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
2727 GNUNET_i2s (&n->peer),
2730 handle_set_key (n, sm);
2734 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2735 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
2737 GNUNET_i2s (&n->peer));
2742 if (n->public_key != NULL)
2743 return; /* multiple HELLOs match!? */
2745 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2746 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2748 GNUNET_break_op (0);
2749 GNUNET_free (n->public_key);
2750 n->public_key = NULL;
2756 * We received a PING message. Validate and transmit
2759 * @param n sender of the PING
2760 * @param m the encrypted PING message itself
2763 handle_ping (struct Neighbour *n, const struct PingMessage *m)
2765 struct PingMessage t;
2766 struct PongMessage tx;
2767 struct PongMessage *tp;
2768 struct MessageEntry *me;
2771 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2772 "Core service receives `%s' request from `%4s'.\n",
2773 "PING", GNUNET_i2s (&n->peer));
2777 &my_identity.hashPubKey,
2780 sizeof (struct PingMessage) -
2781 sizeof (struct GNUNET_MessageHeader)))
2784 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2785 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u\n",
2787 GNUNET_i2s (&t.target),
2788 (unsigned int) ntohl (t.challenge),
2789 (unsigned int) n->decrypt_key.crc32);
2791 GNUNET_STATISTICS_update (stats,
2792 gettext_noop ("# PING messages decrypted"),
2795 if (0 != memcmp (&t.target,
2796 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2798 GNUNET_break_op (0);
2801 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2802 sizeof (struct PongMessage));
2803 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2807 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
2808 me->priority = PONG_PRIORITY;
2809 me->size = sizeof (struct PongMessage);
2810 tx.reserved = htonl (0);
2811 tx.inbound_bw_limit = n->bw_in;
2812 tx.challenge = t.challenge;
2813 tx.target = t.target;
2814 tp = (struct PongMessage *) &me[1];
2815 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
2816 tp->header.size = htons (sizeof (struct PongMessage));
2818 &my_identity.hashPubKey,
2821 sizeof (struct PongMessage) -
2822 sizeof (struct GNUNET_MessageHeader));
2823 GNUNET_STATISTICS_update (stats,
2824 gettext_noop ("# PONG messages created"),
2828 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2829 "Encrypting `%s' with challenge %u using key %u\n",
2831 (unsigned int) ntohl (t.challenge),
2832 (unsigned int) n->encrypt_key.crc32);
2834 /* trigger queue processing */
2835 process_encrypted_neighbour_queue (n);
2840 * We received a PONG message. Validate and update our status.
2842 * @param n sender of the PONG
2843 * @param m the encrypted PONG message itself
2846 handle_pong (struct Neighbour *n,
2847 const struct PongMessage *m)
2849 struct PongMessage t;
2850 struct ConnectNotifyMessage cnm;
2853 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2854 "Core service receives `%s' response from `%4s'.\n",
2855 "PONG", GNUNET_i2s (&n->peer));
2857 /* mark as garbage, just to be sure */
2858 memset (&t, 255, sizeof (t));
2861 &n->peer.hashPubKey,
2864 sizeof (struct PongMessage) -
2865 sizeof (struct GNUNET_MessageHeader)))
2867 GNUNET_break_op (0);
2870 GNUNET_STATISTICS_update (stats,
2871 gettext_noop ("# PONG messages decrypted"),
2874 if (0 != ntohl (t.reserved))
2876 GNUNET_break_op (0);
2880 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2881 "Decrypted `%s' from `%4s' with challenge %u using key %u\n",
2883 GNUNET_i2s (&t.target),
2884 (unsigned int) ntohl (t.challenge),
2885 (unsigned int) n->decrypt_key.crc32);
2887 if ((0 != memcmp (&t.target,
2889 sizeof (struct GNUNET_PeerIdentity))) ||
2890 (n->ping_challenge != ntohl (t.challenge)))
2892 /* PONG malformed */
2894 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2895 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
2897 GNUNET_i2s (&n->peer),
2898 (unsigned int) n->ping_challenge);
2899 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2900 "Received malformed `%s' received from `%4s' with challenge %u\n",
2901 "PONG", GNUNET_i2s (&t.target),
2902 (unsigned int) ntohl (t.challenge));
2904 GNUNET_break_op (0);
2909 case PEER_STATE_DOWN:
2910 GNUNET_break (0); /* should be impossible */
2912 case PEER_STATE_KEY_SENT:
2913 GNUNET_break (0); /* should be impossible, how did we decrypt? */
2915 case PEER_STATE_KEY_RECEIVED:
2916 GNUNET_STATISTICS_update (stats,
2917 gettext_noop ("# Session keys confirmed via PONG"),
2920 n->status = PEER_STATE_KEY_CONFIRMED;
2921 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
2923 n->bw_out_external_limit = t.inbound_bw_limit;
2924 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
2925 n->bw_out_internal_limit);
2926 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
2928 GNUNET_TRANSPORT_set_quota (transport,
2932 GNUNET_TIME_UNIT_FOREVER_REL,
2936 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2937 "Confirmed key via `%s' message for peer `%4s'\n",
2938 "PONG", GNUNET_i2s (&n->peer));
2940 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2942 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2943 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2945 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
2946 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
2947 cnm.distance = htonl (n->last_distance);
2948 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
2950 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
2951 process_encrypted_neighbour_queue (n);
2953 case PEER_STATE_KEY_CONFIRMED:
2954 n->last_activity = GNUNET_TIME_absolute_get ();
2955 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
2956 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
2958 = GNUNET_SCHEDULER_add_delayed (sched,
2959 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
2962 handle_peer_status_change (n);
2972 * We received a SET_KEY message. Validate and update
2973 * our key material and status.
2975 * @param n the neighbour from which we received message m
2976 * @param m the set key message we received
2979 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
2981 struct SetKeyMessage *m_cpy;
2982 struct GNUNET_TIME_Absolute t;
2983 struct GNUNET_CRYPTO_AesSessionKey k;
2984 struct PingMessage *ping;
2985 struct PongMessage *pong;
2986 enum PeerStateMachine sender_status;
2989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2990 "Core service receives `%s' request from `%4s'.\n",
2991 "SET_KEY", GNUNET_i2s (&n->peer));
2993 if (n->public_key == NULL)
2995 if (n->pitr != NULL)
2998 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2999 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
3005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3006 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
3008 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
3009 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
3010 /* lookup n's public key, then try again */
3011 GNUNET_assert (n->skm == NULL);
3013 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
3015 GNUNET_TIME_UNIT_MINUTES,
3016 &process_hello_retry_handle_set_key, n);
3017 GNUNET_STATISTICS_update (stats,
3018 gettext_noop ("# SET_KEY messages deferred (need public key)"),
3023 if (0 != memcmp (&m->target,
3025 sizeof (struct GNUNET_PeerIdentity)))
3027 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3028 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
3030 GNUNET_i2s (&m->target));
3033 if ((ntohl (m->purpose.size) !=
3034 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
3035 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
3036 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
3037 sizeof (struct GNUNET_PeerIdentity)) ||
3039 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3040 &m->purpose, &m->signature, n->public_key)))
3042 /* invalid signature */
3043 GNUNET_break_op (0);
3046 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3047 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3048 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3049 (t.value < n->decrypt_key_created.value))
3051 /* this could rarely happen due to massive re-ordering of
3052 messages on the network level, but is most likely either
3053 a bug or some adversary messing with us. Report. */
3054 GNUNET_break_op (0);
3058 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3059 "Decrypting key material.\n");
3061 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3064 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3065 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3066 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3068 /* failed to decrypt !? */
3069 GNUNET_break_op (0);
3072 GNUNET_STATISTICS_update (stats,
3073 gettext_noop ("# SET_KEY messages decrypted"),
3077 if (n->decrypt_key_created.value != t.value)
3079 /* fresh key, reset sequence numbers */
3080 n->last_sequence_number_received = 0;
3081 n->last_packets_bitmap = 0;
3082 n->decrypt_key_created = t;
3084 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3087 case PEER_STATE_DOWN:
3088 n->status = PEER_STATE_KEY_RECEIVED;
3090 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3091 "Responding to `%s' with my own key.\n", "SET_KEY");
3095 case PEER_STATE_KEY_SENT:
3096 case PEER_STATE_KEY_RECEIVED:
3097 n->status = PEER_STATE_KEY_RECEIVED;
3098 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3099 (sender_status != PEER_STATE_KEY_CONFIRMED))
3102 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3103 "Responding to `%s' with my own key (other peer has status %u).\n",
3105 (unsigned int) sender_status);
3110 case PEER_STATE_KEY_CONFIRMED:
3111 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3112 (sender_status != PEER_STATE_KEY_CONFIRMED))
3115 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3116 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3118 (unsigned int) sender_status);
3127 if (n->pending_ping != NULL)
3129 ping = n->pending_ping;
3130 n->pending_ping = NULL;
3131 handle_ping (n, ping);
3134 if (n->pending_pong != NULL)
3136 pong = n->pending_pong;
3137 n->pending_pong = NULL;
3138 handle_pong (n, pong);
3145 * Send a P2P message to a client.
3147 * @param sender who sent us the message?
3148 * @param client who should we give the message to?
3149 * @param m contains the message to transmit
3150 * @param msize number of bytes in buf to transmit
3153 send_p2p_message_to_client (struct Neighbour *sender,
3154 struct Client *client,
3155 const void *m, size_t msize)
3157 char buf[msize + sizeof (struct NotifyTrafficMessage)];
3158 struct NotifyTrafficMessage *ntm;
3161 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3162 "Core service passes message from `%4s' of type %u to client.\n",
3163 GNUNET_i2s(&sender->peer),
3164 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3166 ntm = (struct NotifyTrafficMessage *) buf;
3167 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
3168 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3169 ntm->distance = htonl (sender->last_distance);
3170 ntm->latency = GNUNET_TIME_relative_hton (sender->last_latency);
3171 ntm->peer = sender->peer;
3172 memcpy (&ntm[1], m, msize);
3173 send_to_client (client, &ntm->header, GNUNET_YES);
3178 * Deliver P2P message to interested clients.
3180 * @param cls always NULL
3181 * @param client who sent us the message (struct Neighbour)
3182 * @param m the message
3185 deliver_message (void *cls,
3187 const struct GNUNET_MessageHeader *m)
3189 struct Neighbour *sender = client;
3190 size_t msize = ntohs (m->size);
3192 struct Client *cpos;
3198 type = ntohs (m->type);
3200 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3201 "Received encapsulated message of type %u and size %u from `%4s'\n",
3202 (unsigned int) type,
3204 GNUNET_i2s (&sender->peer));
3206 GNUNET_snprintf (buf,
3208 gettext_noop ("# bytes of messages of type %u received"),
3209 (unsigned int) type);
3210 GNUNET_STATISTICS_set (stats,
3214 dropped = GNUNET_YES;
3216 while (cpos != NULL)
3218 deliver_full = GNUNET_NO;
3219 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
3220 deliver_full = GNUNET_YES;
3223 for (tpos = 0; tpos < cpos->tcnt; tpos++)
3225 if (type != cpos->types[tpos])
3227 deliver_full = GNUNET_YES;
3231 if (GNUNET_YES == deliver_full)
3233 send_p2p_message_to_client (sender, cpos, m, msize);
3234 dropped = GNUNET_NO;
3236 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
3238 send_p2p_message_to_client (sender, cpos, m,
3239 sizeof (struct GNUNET_MessageHeader));
3243 if (dropped == GNUNET_YES)
3246 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3247 "Message of type %u from `%4s' not delivered to any client.\n",
3248 (unsigned int) type,
3249 GNUNET_i2s (&sender->peer));
3251 GNUNET_STATISTICS_update (stats,
3252 gettext_noop ("# messages not delivered to any client"),
3259 * We received an encrypted message. Decrypt, validate and
3260 * pass on to the appropriate clients.
3263 handle_encrypted_message (struct Neighbour *n,
3264 const struct EncryptedMessage *m)
3266 size_t size = ntohs (m->header.size);
3268 struct EncryptedMessage *pt; /* plaintext */
3271 struct GNUNET_TIME_Absolute t;
3275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3276 "Core service receives `%s' request from `%4s'.\n",
3277 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
3279 GNUNET_CRYPTO_hash (&m->iv_seed, sizeof (uint32_t), &iv);
3285 &buf[ENCRYPTED_HEADER_SIZE],
3286 size - ENCRYPTED_HEADER_SIZE))
3288 pt = (struct EncryptedMessage *) buf;
3290 GNUNET_CRYPTO_hmac (&n->decrypt_key,
3291 &pt->sequence_number,
3292 size - ENCRYPTED_HEADER_SIZE - sizeof (GNUNET_HashCode), &ph);
3294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3295 "V-Hashed %u bytes of plaintext (`%s') using IV `%d'\n",
3296 (unsigned int) (size - ENCRYPTED_HEADER_SIZE - sizeof (GNUNET_HashCode)),
3300 if (0 != memcmp (&ph,
3302 sizeof (GNUNET_HashCode)))
3304 /* checksum failed */
3305 GNUNET_break_op (0);
3309 /* validate sequence number */
3310 snum = ntohl (pt->sequence_number);
3311 if (n->last_sequence_number_received == snum)
3313 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3314 "Received duplicate message, ignoring.\n");
3315 /* duplicate, ignore */
3316 GNUNET_STATISTICS_set (stats,
3317 gettext_noop ("# bytes dropped (duplicates)"),
3322 if ((n->last_sequence_number_received > snum) &&
3323 (n->last_sequence_number_received - snum > 32))
3325 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3326 "Received ancient out of sequence message, ignoring.\n");
3327 /* ancient out of sequence, ignore */
3328 GNUNET_STATISTICS_set (stats,
3329 gettext_noop ("# bytes dropped (out of sequence)"),
3334 if (n->last_sequence_number_received > snum)
3336 unsigned int rotbit =
3337 1 << (n->last_sequence_number_received - snum - 1);
3338 if ((n->last_packets_bitmap & rotbit) != 0)
3340 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3341 "Received duplicate message, ignoring.\n");
3342 GNUNET_STATISTICS_set (stats,
3343 gettext_noop ("# bytes dropped (duplicates)"),
3346 /* duplicate, ignore */
3349 n->last_packets_bitmap |= rotbit;
3351 if (n->last_sequence_number_received < snum)
3353 n->last_packets_bitmap <<= (snum - n->last_sequence_number_received);
3354 n->last_sequence_number_received = snum;
3357 /* check timestamp */
3358 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
3359 if (GNUNET_TIME_absolute_get_duration (t).value > MAX_MESSAGE_AGE.value)
3361 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3363 ("Message received far too old (%llu ms). Content ignored.\n"),
3364 GNUNET_TIME_absolute_get_duration (t).value);
3365 GNUNET_STATISTICS_set (stats,
3366 gettext_noop ("# bytes dropped (ancient message)"),
3372 /* process decrypted message(s) */
3373 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
3375 #if DEBUG_CORE_SET_QUOTA
3376 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3377 "Received %u b/s as new inbound limit for peer `%4s'\n",
3378 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
3379 GNUNET_i2s (&n->peer));
3381 n->bw_out_external_limit = pt->inbound_bw_limit;
3382 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3383 n->bw_out_internal_limit);
3384 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3386 GNUNET_TRANSPORT_set_quota (transport,
3390 GNUNET_TIME_UNIT_FOREVER_REL,
3393 n->last_activity = GNUNET_TIME_absolute_get ();
3394 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3395 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3397 = GNUNET_SCHEDULER_add_delayed (sched,
3398 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3401 GNUNET_STATISTICS_set (stats,
3402 gettext_noop ("# bytes of payload decrypted"),
3403 size - sizeof (struct EncryptedMessage),
3405 handle_peer_status_change (n);
3406 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
3408 &buf[sizeof (struct EncryptedMessage)],
3409 size - sizeof (struct EncryptedMessage),
3410 GNUNET_YES, GNUNET_NO))
3411 GNUNET_break_op (0);
3416 * Function called by the transport for each received message.
3418 * @param cls closure
3419 * @param peer (claimed) identity of the other peer
3420 * @param message the message
3421 * @param latency estimated latency for communicating with the
3422 * given peer (round-trip)
3423 * @param distance in overlay hops, as given by transport plugin
3426 handle_transport_receive (void *cls,
3427 const struct GNUNET_PeerIdentity *peer,
3428 const struct GNUNET_MessageHeader *message,
3429 struct GNUNET_TIME_Relative latency,
3430 unsigned int distance)
3432 struct Neighbour *n;
3433 struct GNUNET_TIME_Absolute now;
3440 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3441 "Received message of type %u from `%4s', demultiplexing.\n",
3442 (unsigned int) ntohs (message->type),
3445 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3450 n = find_neighbour (peer);
3452 n = create_neighbour (peer);
3453 changed = (latency.value != n->last_latency.value) || (distance != n->last_distance);
3454 n->last_latency = latency;
3455 n->last_distance = distance;
3456 up = (n->status == PEER_STATE_KEY_CONFIRMED);
3457 type = ntohs (message->type);
3458 size = ntohs (message->size);
3461 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
3462 if (size != sizeof (struct SetKeyMessage))
3464 GNUNET_break_op (0);
3467 GNUNET_STATISTICS_update (stats, gettext_noop ("# session keys received"), 1, GNUNET_NO);
3468 handle_set_key (n, (const struct SetKeyMessage *) message);
3470 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3471 if (size < sizeof (struct EncryptedMessage) +
3472 sizeof (struct GNUNET_MessageHeader))
3474 GNUNET_break_op (0);
3477 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3478 (n->status != PEER_STATE_KEY_CONFIRMED))
3480 GNUNET_break_op (0);
3483 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3485 case GNUNET_MESSAGE_TYPE_CORE_PING:
3486 if (size != sizeof (struct PingMessage))
3488 GNUNET_break_op (0);
3491 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
3492 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3493 (n->status != PEER_STATE_KEY_CONFIRMED))
3496 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3497 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3498 "PING", GNUNET_i2s (&n->peer));
3500 GNUNET_free_non_null (n->pending_ping);
3501 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3502 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3505 handle_ping (n, (const struct PingMessage *) message);
3507 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3508 if (size != sizeof (struct PongMessage))
3510 GNUNET_break_op (0);
3513 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
3514 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3515 (n->status != PEER_STATE_KEY_CONFIRMED) )
3518 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3519 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3520 "PONG", GNUNET_i2s (&n->peer));
3522 GNUNET_free_non_null (n->pending_pong);
3523 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
3524 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
3527 handle_pong (n, (const struct PongMessage *) message);
3530 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3531 _("Unsupported message of type %u received.\n"),
3532 (unsigned int) type);
3535 if (n->status == PEER_STATE_KEY_CONFIRMED)
3537 now = GNUNET_TIME_absolute_get ();
3538 n->last_activity = now;
3539 changed = GNUNET_YES;
3542 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), 1, GNUNET_NO);
3543 n->time_established = now;
3545 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3546 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3548 = GNUNET_SCHEDULER_add_delayed (sched,
3549 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3554 handle_peer_status_change (n);
3559 * Function that recalculates the bandwidth quota for the
3560 * given neighbour and transmits it to the transport service.
3562 * @param cls neighbour for the quota update
3566 neighbour_quota_update (void *cls,
3567 const struct GNUNET_SCHEDULER_TaskContext *tc)
3569 struct Neighbour *n = cls;
3570 struct GNUNET_BANDWIDTH_Value32NBO q_in;
3573 unsigned long long distributable;
3574 uint64_t need_per_peer;
3575 uint64_t need_per_second;
3578 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3579 "Neighbour quota update calculation running for peer `%4s'\n",
3580 GNUNET_i2s (&n->peer));
3582 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
3583 /* calculate relative preference among all neighbours;
3584 divides by a bit more to avoid division by zero AND to
3585 account for possibility of new neighbours joining any time
3586 AND to convert to double... */
3587 if (preference_sum == 0)
3589 pref_rel = 1.0 / (double) neighbour_count;
3593 pref_rel = n->current_preference / preference_sum;
3595 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
3596 GNUNET_TIME_UNIT_SECONDS);
3597 need_per_second = need_per_peer * neighbour_count;
3599 if (bandwidth_target_out_bps > need_per_second)
3600 distributable = bandwidth_target_out_bps - need_per_second;
3601 share = distributable * pref_rel;
3602 if (share + need_per_peer > UINT32_MAX)
3603 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
3605 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
3606 /* check if we want to disconnect for good due to inactivity */
3607 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) &&
3608 (GNUNET_TIME_absolute_get_duration (n->time_established).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) )
3611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3612 "Forcing disconnect of `%4s' due to inactivity\n",
3613 GNUNET_i2s (&n->peer));
3615 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
3617 #if DEBUG_CORE_QUOTA
3618 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3619 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
3620 GNUNET_i2s (&n->peer),
3621 (unsigned int) ntohl (q_in.value__),
3622 bandwidth_target_out_bps,
3623 (unsigned int) ntohl (n->bw_in.value__),
3624 (unsigned int) ntohl (n->bw_out.value__),
3625 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
3627 if (n->bw_in.value__ != q_in.value__)
3630 if (GNUNET_YES == n->is_connected)
3631 GNUNET_TRANSPORT_set_quota (transport,
3635 GNUNET_TIME_UNIT_FOREVER_REL,
3637 handle_peer_status_change (n);
3639 schedule_quota_update (n);
3644 * Function called by transport to notify us that
3645 * a peer connected to us (on the network level).
3647 * @param cls closure
3648 * @param peer the peer that connected
3649 * @param latency current latency of the connection
3650 * @param distance in overlay hops, as given by transport plugin
3653 handle_transport_notify_connect (void *cls,
3654 const struct GNUNET_PeerIdentity *peer,
3655 struct GNUNET_TIME_Relative latency,
3656 unsigned int distance)
3658 struct Neighbour *n;
3660 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3665 n = find_neighbour (peer);
3668 if (GNUNET_YES == n->is_connected)
3670 /* duplicate connect notification!? */
3677 n = create_neighbour (peer);
3679 GNUNET_STATISTICS_update (stats,
3680 gettext_noop ("# peers connected (transport)"),
3683 n->is_connected = GNUNET_YES;
3684 n->last_latency = latency;
3685 n->last_distance = distance;
3686 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
3689 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
3693 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3694 "Received connection from `%4s'.\n",
3695 GNUNET_i2s (&n->peer));
3697 GNUNET_TRANSPORT_set_quota (transport,
3701 GNUNET_TIME_UNIT_FOREVER_REL,
3708 * Function called by transport telling us that a peer
3711 * @param cls closure
3712 * @param peer the peer that disconnected
3715 handle_transport_notify_disconnect (void *cls,
3716 const struct GNUNET_PeerIdentity *peer)
3718 struct DisconnectNotifyMessage cnm;
3719 struct Neighbour *n;
3720 struct GNUNET_TIME_Relative left;
3723 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3724 "Peer `%4s' disconnected from us.\n", GNUNET_i2s (peer));
3726 n = find_neighbour (peer);
3732 GNUNET_break (n->is_connected);
3733 if (n->status == PEER_STATE_KEY_CONFIRMED)
3735 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
3736 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
3738 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
3740 n->is_connected = GNUNET_NO;
3741 GNUNET_STATISTICS_update (stats,
3742 gettext_noop ("# peers connected (transport)"),
3745 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
3746 GNUNET_SCHEDULER_cancel (sched,
3747 n->dead_clean_task);
3748 left = GNUNET_TIME_relative_subtract (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
3749 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT);
3750 n->last_activity = GNUNET_TIME_absolute_subtract (GNUNET_TIME_absolute_get (),
3752 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
3753 GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT,
3754 &consider_free_task,
3760 * Last task run during shutdown. Disconnects us from
3764 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3766 struct Neighbour *n;
3770 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3771 "Core service shutting down.\n");
3773 GNUNET_assert (transport != NULL);
3774 GNUNET_TRANSPORT_disconnect (transport);
3776 while (NULL != (n = neighbours))
3778 neighbours = n->next;
3779 GNUNET_assert (neighbour_count > 0);
3783 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
3784 GNUNET_SERVER_notification_context_destroy (notifier);
3786 while (NULL != (c = clients))
3787 handle_client_disconnect (NULL, c->client_handle);
3788 if (my_private_key != NULL)
3789 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3791 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3792 if (peerinfo != NULL)
3793 GNUNET_PEERINFO_disconnect (peerinfo);
3795 GNUNET_SERVER_mst_destroy (mst);
3800 * Initiate core service.
3802 * @param cls closure
3803 * @param s scheduler to use
3804 * @param server the initialized server
3805 * @param c configuration to use
3809 struct GNUNET_SCHEDULER_Handle *s,
3810 struct GNUNET_SERVER_Handle *server,
3811 const struct GNUNET_CONFIGURATION_Handle *c)
3813 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
3814 {&handle_client_init, NULL,
3815 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
3816 {&handle_client_request_info, NULL,
3817 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
3818 sizeof (struct RequestInfoMessage)},
3819 {&handle_client_send, NULL,
3820 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
3821 {&handle_client_request_connect, NULL,
3822 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
3823 sizeof (struct ConnectMessage)},
3830 /* parse configuration */
3833 GNUNET_CONFIGURATION_get_value_number (c,
3836 &bandwidth_target_in_bps)) ||
3838 GNUNET_CONFIGURATION_get_value_number (c,
3841 &bandwidth_target_out_bps)) ||
3843 GNUNET_CONFIGURATION_get_value_filename (c,
3845 "HOSTKEY", &keyfile)))
3847 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3849 ("Core service is lacking key configuration settings. Exiting.\n"));
3850 GNUNET_SCHEDULER_shutdown (s);
3853 peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
3854 if (NULL == peerinfo)
3856 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3857 _("Could not access PEERINFO service. Exiting.\n"));
3858 GNUNET_SCHEDULER_shutdown (s);
3859 GNUNET_free (keyfile);
3862 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3863 GNUNET_free (keyfile);
3864 if (my_private_key == NULL)
3866 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3867 _("Core service could not access hostkey. Exiting.\n"));
3868 GNUNET_PEERINFO_disconnect (peerinfo);
3869 GNUNET_SCHEDULER_shutdown (s);
3872 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3873 GNUNET_CRYPTO_hash (&my_public_key,
3874 sizeof (my_public_key), &my_identity.hashPubKey);
3875 /* setup notification */
3876 notifier = GNUNET_SERVER_notification_context_create (server,
3878 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
3879 /* setup transport connection */
3880 transport = GNUNET_TRANSPORT_connect (sched,
3883 &handle_transport_receive,
3884 &handle_transport_notify_connect,
3885 &handle_transport_notify_disconnect);
3886 GNUNET_assert (NULL != transport);
3887 stats = GNUNET_STATISTICS_create (sched, "core", cfg);
3888 mst = GNUNET_SERVER_mst_create (&deliver_message,
3890 GNUNET_SCHEDULER_add_delayed (sched,
3891 GNUNET_TIME_UNIT_FOREVER_REL,
3892 &cleaning_task, NULL);
3893 /* process client requests */
3894 GNUNET_SERVER_add_handlers (server, handlers);
3895 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3896 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
3902 * The main function for the transport service.
3904 * @param argc number of arguments from the command line
3905 * @param argv command line arguments
3906 * @return 0 ok, 1 on error
3909 main (int argc, char *const *argv)
3911 return (GNUNET_OK ==
3912 GNUNET_SERVICE_run (argc,
3915 GNUNET_SERVICE_OPTION_NONE,
3916 &run, NULL)) ? 0 : 1;
3919 /* end of gnunet-service-core.c */