2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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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 * Handle CORE_INIT request.
836 handle_client_init (void *cls,
837 struct GNUNET_SERVER_Client *client,
838 const struct GNUNET_MessageHeader *message)
840 const struct InitMessage *im;
841 struct InitReplyMessage irm;
844 const uint16_t *types;
847 struct ConnectNotifyMessage cnm;
850 #if DEBUG_CORE_CLIENT
851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
852 "Client connecting to core service with `%s' message\n",
855 /* check that we don't have an entry already */
859 if (client == c->client_handle)
862 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
867 msize = ntohs (message->size);
868 if (msize < sizeof (struct InitMessage))
871 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
874 GNUNET_SERVER_notification_context_add (notifier, client);
875 im = (const struct InitMessage *) message;
876 types = (const uint16_t *) &im[1];
877 msize -= sizeof (struct InitMessage);
878 c = GNUNET_malloc (sizeof (struct Client) + msize);
879 c->client_handle = client;
882 c->tcnt = msize / sizeof (uint16_t);
883 c->types = (const uint16_t *) &c[1];
884 wtypes = (uint16_t *) &c[1];
885 for (i=0;i<c->tcnt;i++)
886 wtypes[i] = ntohs (types[i]);
887 c->options = ntohl (im->options);
888 #if DEBUG_CORE_CLIENT
889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
890 "Client %p is interested in %u message types\n",
892 (unsigned int) c->tcnt);
894 /* send init reply message */
895 irm.header.size = htons (sizeof (struct InitReplyMessage));
896 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
897 irm.reserved = htonl (0);
898 memcpy (&irm.publicKey,
900 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
901 #if DEBUG_CORE_CLIENT
902 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
903 "Sending `%s' message to client.\n", "INIT_REPLY");
905 send_to_client (c, &irm.header, GNUNET_NO);
906 if (0 != (c->options & GNUNET_CORE_OPTION_SEND_CONNECT))
908 /* notify new client about existing neighbours */
909 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
910 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
914 if (n->status == PEER_STATE_KEY_CONFIRMED)
916 #if DEBUG_CORE_CLIENT
917 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
918 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
920 cnm.distance = htonl (n->last_distance);
921 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
923 send_to_client (c, &cnm.header, GNUNET_NO);
928 GNUNET_SERVER_receive_done (client, GNUNET_OK);
933 * A client disconnected, clean up.
936 * @param client identification of the client
939 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
946 #if DEBUG_CORE_CLIENT
947 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
948 "Client %p has disconnected from core service.\n",
955 if (client == pos->client_handle)
960 prev->next = pos->next;
967 /* client never sent INIT */
972 * Handle REQUEST_INFO request.
975 handle_client_request_info (void *cls,
976 struct GNUNET_SERVER_Client *client,
977 const struct GNUNET_MessageHeader *message)
979 const struct RequestInfoMessage *rcm;
981 struct ConfigurationInfoMessage cim;
984 unsigned long long old_preference;
985 struct GNUNET_SERVER_TransmitContext *tc;
987 #if DEBUG_CORE_CLIENT
988 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
989 "Core service receives `%s' request.\n", "REQUEST_INFO");
991 rcm = (const struct RequestInfoMessage *) message;
992 n = find_neighbour (&rcm->peer);
993 memset (&cim, 0, sizeof (cim));
996 want_reserv = ntohl (rcm->reserve_inbound);
997 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
999 n->bw_out_internal_limit = rcm->limit_outbound;
1000 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
1001 n->bw_out_external_limit);
1002 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
1004 GNUNET_TRANSPORT_set_quota (transport,
1008 GNUNET_TIME_UNIT_FOREVER_REL,
1011 if (want_reserv < 0)
1013 got_reserv = want_reserv;
1015 else if (want_reserv > 0)
1017 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
1018 want_reserv).value == 0)
1019 got_reserv = want_reserv;
1021 got_reserv = 0; /* all or nothing */
1025 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
1027 old_preference = n->current_preference;
1028 n->current_preference += GNUNET_ntohll(rcm->preference_change);
1029 if (old_preference > n->current_preference)
1031 /* overflow; cap at maximum value */
1032 n->current_preference = ULLONG_MAX;
1034 update_preference_sum (n->current_preference - old_preference);
1035 #if DEBUG_CORE_QUOTA
1036 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1037 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1039 GNUNET_i2s (&rcm->peer),
1042 cim.reserved_amount = htonl (got_reserv);
1043 cim.bw_in = n->bw_in;
1044 cim.bw_out = n->bw_out;
1045 cim.preference = n->current_preference;
1047 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1048 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1049 cim.peer = rcm->peer;
1051 #if DEBUG_CORE_CLIENT
1052 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1053 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1055 tc = GNUNET_SERVER_transmit_context_create (client);
1056 GNUNET_SERVER_transmit_context_append_message (tc, &cim.header);
1057 GNUNET_SERVER_transmit_context_run (tc,
1058 GNUNET_TIME_UNIT_FOREVER_REL);
1063 * Free the given entry for the neighbour (it has
1064 * already been removed from the list at this point).
1066 * @param n neighbour to free
1069 free_neighbour (struct Neighbour *n)
1071 struct MessageEntry *m;
1074 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1075 "Destroying neighbour entry for peer `%4s'\n",
1076 GNUNET_i2s (&n->peer));
1078 if (n->pitr != NULL)
1080 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1085 GNUNET_free (n->skm);
1088 while (NULL != (m = n->messages))
1090 n->messages = m->next;
1093 while (NULL != (m = n->encrypted_head))
1095 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1102 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1105 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1106 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1107 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1108 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
1109 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1110 GNUNET_SCHEDULER_cancel (sched, n->quota_update_task);
1111 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1112 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1113 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
1114 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
1115 if (n->status == PEER_STATE_KEY_CONFIRMED)
1116 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), -1, GNUNET_NO);
1117 GNUNET_free_non_null (n->public_key);
1118 GNUNET_free_non_null (n->pending_ping);
1119 GNUNET_free_non_null (n->pending_pong);
1125 * Check if we have encrypted messages for the specified neighbour
1126 * pending, and if so, check with the transport about sending them
1129 * @param n neighbour to check.
1131 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1135 * Encrypt size bytes from in and write the result to out. Use the
1136 * key for outbound traffic of the given neighbour.
1138 * @param n neighbour we are sending to
1139 * @param iv initialization vector to use
1140 * @param in ciphertext
1141 * @param out plaintext
1142 * @param size size of in/out
1143 * @return GNUNET_OK on success
1146 do_encrypt (struct Neighbour *n,
1147 const GNUNET_HashCode * iv,
1148 const void *in, void *out, size_t size)
1150 if (size != (uint16_t) size)
1155 GNUNET_assert (size ==
1156 GNUNET_CRYPTO_aes_encrypt (in,
1160 GNUNET_CRYPTO_AesInitializationVector
1162 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes encrypted"), size, GNUNET_NO);
1164 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1165 "Encrypted %u bytes for `%4s' using key %u\n",
1166 (unsigned int) size,
1167 GNUNET_i2s (&n->peer),
1168 (unsigned int) n->encrypt_key.crc32);
1175 * Consider freeing the given neighbour since we may not need
1176 * to keep it around anymore.
1178 * @param n neighbour to consider discarding
1181 consider_free_neighbour (struct Neighbour *n);
1185 * Task triggered when a neighbour entry is about to time out
1186 * (and we should prevent this by sending a PING).
1188 * @param cls the 'struct Neighbour'
1189 * @param tc scheduler context (not used)
1192 send_keep_alive (void *cls,
1193 const struct GNUNET_SCHEDULER_TaskContext *tc)
1195 struct Neighbour *n = cls;
1196 struct GNUNET_TIME_Relative retry;
1197 struct GNUNET_TIME_Relative left;
1198 struct MessageEntry *me;
1199 struct PingMessage pp;
1200 struct PingMessage *pm;
1202 n->keep_alive_task = GNUNET_SCHEDULER_NO_TASK;
1204 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1205 sizeof (struct PingMessage));
1206 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1207 me->priority = PING_PRIORITY;
1208 me->size = sizeof (struct PingMessage);
1209 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1213 pm = (struct PingMessage *) &me[1];
1214 pm->header.size = htons (sizeof (struct PingMessage));
1215 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1216 pp.challenge = htonl (n->ping_challenge);
1217 pp.target = n->peer;
1219 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1220 "Encrypting `%s' message with challenge %u for `%4s' using key %u.\n",
1222 (unsigned int) n->ping_challenge,
1223 GNUNET_i2s (&n->peer),
1224 (unsigned int) n->encrypt_key.crc32);
1227 &n->peer.hashPubKey,
1230 sizeof (struct PingMessage) -
1231 sizeof (struct GNUNET_MessageHeader));
1232 process_encrypted_neighbour_queue (n);
1233 /* reschedule PING job */
1234 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1235 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1236 retry = GNUNET_TIME_relative_max (GNUNET_TIME_relative_divide (left, 2),
1237 MIN_PING_FREQUENCY);
1239 = GNUNET_SCHEDULER_add_delayed (sched,
1248 * Task triggered when a neighbour entry might have gotten stale.
1250 * @param cls the 'struct Neighbour'
1251 * @param tc scheduler context (not used)
1254 consider_free_task (void *cls,
1255 const struct GNUNET_SCHEDULER_TaskContext *tc)
1257 struct Neighbour *n = cls;
1259 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1260 consider_free_neighbour (n);
1265 * Consider freeing the given neighbour since we may not need
1266 * to keep it around anymore.
1268 * @param n neighbour to consider discarding
1271 consider_free_neighbour (struct Neighbour *n)
1273 struct Neighbour *pos;
1274 struct Neighbour *prev;
1275 struct GNUNET_TIME_Relative left;
1277 if ( (n->th != NULL) ||
1278 (n->pitr != NULL) ||
1279 (n->status == PEER_STATE_KEY_CONFIRMED) ||
1280 (GNUNET_YES == n->is_connected) )
1281 return; /* no chance */
1283 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1284 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT));
1287 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1288 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1289 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
1291 &consider_free_task,
1295 /* actually free the neighbour... */
1304 neighbours = n->next;
1306 prev->next = n->next;
1307 GNUNET_assert (neighbour_count > 0);
1309 GNUNET_STATISTICS_set (stats,
1310 gettext_noop ("# neighbour entries allocated"),
1318 * Function called when the transport service is ready to
1319 * receive an encrypted message for the respective peer
1321 * @param cls neighbour to use message from
1322 * @param size number of bytes we can transmit
1323 * @param buf where to copy the message
1324 * @return number of bytes transmitted
1327 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1329 struct Neighbour *n = cls;
1330 struct MessageEntry *m;
1335 m = n->encrypted_head;
1339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1340 "Encrypted message queue empty, no messages added to buffer for `%4s'\n",
1341 GNUNET_i2s (&n->peer));
1345 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1352 GNUNET_assert (size >= m->size);
1353 memcpy (cbuf, &m[1], m->size);
1355 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1359 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1360 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1362 GNUNET_i2s (&n->peer));
1364 process_encrypted_neighbour_queue (n);
1369 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1370 "Transmission of message of type %u and size %u failed\n",
1371 (unsigned int) ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1372 (unsigned int) m->size);
1376 consider_free_neighbour (n);
1382 * Check if we have plaintext messages for the specified neighbour
1383 * pending, and if so, consider batching and encrypting them (and
1384 * then trigger processing of the encrypted queue if needed).
1386 * @param n neighbour to check.
1388 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1392 * Check if we have encrypted messages for the specified neighbour
1393 * pending, and if so, check with the transport about sending them
1396 * @param n neighbour to check.
1399 process_encrypted_neighbour_queue (struct Neighbour *n)
1401 struct MessageEntry *m;
1404 return; /* request already pending */
1405 m = n->encrypted_head;
1408 /* encrypted queue empty, try plaintext instead */
1409 process_plaintext_neighbour_queue (n);
1413 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1414 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1415 (unsigned int) m->size,
1416 GNUNET_i2s (&n->peer),
1417 (unsigned long long) GNUNET_TIME_absolute_get_remaining (m->deadline).
1421 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1424 GNUNET_TIME_absolute_get_remaining
1426 ¬ify_encrypted_transmit_ready,
1430 /* message request too large or duplicate request */
1432 /* discard encrypted message */
1433 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1437 process_encrypted_neighbour_queue (n);
1443 * Decrypt size bytes from in and write the result to out. Use the
1444 * key for inbound traffic of the given neighbour. This function does
1445 * NOT do any integrity-checks on the result.
1447 * @param n neighbour we are receiving from
1448 * @param iv initialization vector to use
1449 * @param in ciphertext
1450 * @param out plaintext
1451 * @param size size of in/out
1452 * @return GNUNET_OK on success
1455 do_decrypt (struct Neighbour *n,
1456 const GNUNET_HashCode * iv,
1457 const void *in, void *out, size_t size)
1459 if (size != (uint16_t) size)
1464 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1465 (n->status != PEER_STATE_KEY_CONFIRMED))
1467 GNUNET_break_op (0);
1468 return GNUNET_SYSERR;
1471 GNUNET_CRYPTO_aes_decrypt (in,
1475 GNUNET_CRYPTO_AesInitializationVector *) iv,
1479 return GNUNET_SYSERR;
1481 GNUNET_STATISTICS_update (stats, gettext_noop ("# bytes decrypted"), size, GNUNET_NO);
1483 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1484 "Decrypted %u bytes from `%4s' using key %u\n",
1485 (unsigned int) size,
1486 GNUNET_i2s (&n->peer),
1487 (unsigned int) n->decrypt_key.crc32);
1494 * Select messages for transmission. This heuristic uses a combination
1495 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1496 * and priority-based discard (in case no feasible schedule exist) and
1497 * speculative optimization (defer any kind of transmission until
1498 * we either create a batch of significant size, 25% of max, or until
1499 * we are close to a deadline). Furthermore, when scheduling the
1500 * heuristic also packs as many messages into the batch as possible,
1501 * starting with those with the earliest deadline. Yes, this is fun.
1503 * @param n neighbour to select messages from
1504 * @param size number of bytes to select for transmission
1505 * @param retry_time set to the time when we should try again
1506 * (only valid if this function returns zero)
1507 * @return number of bytes selected, or 0 if we decided to
1508 * defer scheduling overall; in that case, retry_time is set.
1511 select_messages (struct Neighbour *n,
1512 size_t size, struct GNUNET_TIME_Relative *retry_time)
1514 struct MessageEntry *pos;
1515 struct MessageEntry *min;
1516 struct MessageEntry *last;
1517 unsigned int min_prio;
1518 struct GNUNET_TIME_Absolute t;
1519 struct GNUNET_TIME_Absolute now;
1520 struct GNUNET_TIME_Relative delta;
1522 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
1525 unsigned int queue_size;
1526 int discard_low_prio;
1528 GNUNET_assert (NULL != n->messages);
1529 now = GNUNET_TIME_absolute_get ();
1530 /* last entry in linked list of messages processed */
1532 /* should we remove the entry with the lowest
1533 priority from consideration for scheduling at the
1544 discard_low_prio = GNUNET_YES;
1545 while (GNUNET_YES == discard_low_prio)
1548 min_prio = UINT_MAX;
1549 discard_low_prio = GNUNET_NO;
1550 /* calculate number of bytes available for transmission at time "t" */
1551 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
1553 /* how many bytes have we (hypothetically) scheduled so far */
1555 /* maximum time we can wait before transmitting anything
1556 and still make all of our deadlines */
1557 slack = GNUNET_TIME_UNIT_FOREVER_REL;
1559 /* note that we use "*2" here because we want to look
1560 a bit further into the future; much more makes no
1561 sense since new message might be scheduled in the
1563 while ((pos != NULL) && (off < size * 2))
1565 if (pos->do_transmit == GNUNET_YES)
1567 /* already removed from consideration */
1571 if (discard_low_prio == GNUNET_NO)
1573 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
1574 if (delta.value > 0)
1576 // FIXME: HUH? Check!
1578 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
1581 if (avail < pos->size)
1583 // FIXME: HUH? Check!
1584 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1589 /* update slack, considering both its absolute deadline
1590 and relative deadlines caused by other messages
1591 with their respective load */
1592 slack = GNUNET_TIME_relative_min (slack,
1593 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
1595 if (pos->deadline.value <= now.value)
1598 slack = GNUNET_TIME_UNIT_ZERO;
1600 else if (GNUNET_YES == pos->got_slack)
1602 /* should be soon now! */
1603 slack = GNUNET_TIME_relative_min (slack,
1604 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
1609 GNUNET_TIME_relative_min (slack,
1610 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
1611 pos->got_slack = GNUNET_YES;
1612 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
1613 GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY));
1618 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
1619 if (pos->priority <= min_prio)
1621 /* update min for discard */
1622 min_prio = pos->priority;
1627 if (discard_low_prio)
1629 GNUNET_assert (min != NULL);
1630 /* remove lowest-priority entry from consideration */
1631 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1635 /* guard against sending "tiny" messages with large headers without
1637 if ( (slack.value > GNUNET_CONSTANTS_MAX_CORK_DELAY.value) &&
1639 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
1641 /* less than 25% of message would be filled with deadlines still
1642 being met if we delay by one second or more; so just wait for
1643 more data; but do not wait longer than 1s (since we don't want
1644 to delay messages for a really long time either). */
1645 *retry_time = GNUNET_CONSTANTS_MAX_CORK_DELAY;
1646 /* reset do_transmit values for next time */
1649 pos->do_transmit = GNUNET_NO;
1653 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1654 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
1655 (unsigned long long) retry_time->value,
1657 (unsigned int) size);
1661 /* select marked messages (up to size) for transmission */
1666 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
1668 pos->do_transmit = GNUNET_YES; /* mark for transmission */
1672 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1673 "Selecting message of size %u for transmission\n",
1674 (unsigned int) pos->size);
1680 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1681 "Not selecting message of size %u for transmission at this time (maximum is %u)\n",
1682 (unsigned int) pos->size,
1685 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
1690 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1691 "Selected %llu/%llu bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
1692 (unsigned long long) off, (unsigned long long) tsize,
1693 queue_size, (unsigned int) MAX_PEER_QUEUE_SIZE,
1694 GNUNET_i2s (&n->peer));
1701 * Batch multiple messages into a larger buffer.
1703 * @param n neighbour to take messages from
1704 * @param buf target buffer
1705 * @param size size of buf
1706 * @param deadline set to transmission deadline for the result
1707 * @param retry_time set to the time when we should try again
1708 * (only valid if this function returns zero)
1709 * @param priority set to the priority of the batch
1710 * @return number of bytes written to buf (can be zero)
1713 batch_message (struct Neighbour *n,
1716 struct GNUNET_TIME_Absolute *deadline,
1717 struct GNUNET_TIME_Relative *retry_time,
1718 unsigned int *priority)
1720 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE - 1];
1721 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
1722 struct MessageEntry *pos;
1723 struct MessageEntry *prev;
1724 struct MessageEntry *next;
1729 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1730 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
1731 if (0 == select_messages (n, size, retry_time))
1734 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1735 "No messages selected, will try again in %llu ms\n",
1740 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
1741 ntm->distance = htonl (n->last_distance);
1742 ntm->latency = GNUNET_TIME_relative_hton (n->last_latency);
1743 ntm->peer = n->peer;
1746 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
1749 if (GNUNET_YES == pos->do_transmit)
1751 GNUNET_assert (pos->size <= size);
1752 /* do notifications */
1753 /* FIXME: track if we have *any* client that wants
1754 full notifications and only do this if that is
1756 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
1758 memcpy (&ntm[1], &pos[1], pos->size);
1759 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1760 sizeof (struct GNUNET_MessageHeader));
1761 send_to_all_clients (&ntm->header,
1763 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
1767 /* message too large for 'full' notifications, we do at
1768 least the 'hdr' type */
1771 sizeof (struct GNUNET_MessageHeader));
1773 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1775 send_to_all_clients (&ntm->header,
1777 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
1779 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1780 "Encrypting %u bytes with message of type %u and size %u\n",
1782 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->type),
1783 (unsigned int) ntohs(((const struct GNUNET_MessageHeader*)&pos[1])->size));
1785 /* copy for encrypted transmission */
1786 memcpy (&buf[ret], &pos[1], pos->size);
1789 *priority += pos->priority;
1791 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1792 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
1793 (unsigned int) pos->size,
1794 (unsigned long long) GNUNET_TIME_absolute_get_remaining (pos->deadline).value);
1796 deadline->value = GNUNET_MIN (deadline->value, pos->deadline.value);
1810 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1811 "Deadline for message batch is %llu ms\n",
1812 GNUNET_TIME_absolute_get_remaining (*deadline).value);
1819 * Remove messages with deadlines that have long expired from
1822 * @param n neighbour to inspect
1825 discard_expired_messages (struct Neighbour *n)
1827 struct MessageEntry *prev;
1828 struct MessageEntry *next;
1829 struct MessageEntry *pos;
1830 struct GNUNET_TIME_Absolute now;
1831 struct GNUNET_TIME_Relative delta;
1833 now = GNUNET_TIME_absolute_get ();
1839 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
1840 if (delta.value > PAST_EXPIRATION_DISCARD_TIME.value)
1843 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1844 "Message is %llu ms past due, discarding.\n",
1861 * Signature of the main function of a task.
1863 * @param cls closure
1864 * @param tc context information (why was this task triggered now)
1867 retry_plaintext_processing (void *cls,
1868 const struct GNUNET_SCHEDULER_TaskContext *tc)
1870 struct Neighbour *n = cls;
1872 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1873 process_plaintext_neighbour_queue (n);
1878 * Send our key (and encrypted PING) to the other peer.
1880 * @param n the other peer
1882 static void send_key (struct Neighbour *n);
1885 * Task that will retry "send_key" if our previous attempt failed
1889 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1891 struct Neighbour *n = cls;
1894 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1895 "Retrying key transmission to `%4s'\n",
1896 GNUNET_i2s (&n->peer));
1898 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
1899 n->set_key_retry_frequency =
1900 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
1906 * Check if we have plaintext messages for the specified neighbour
1907 * pending, and if so, consider batching and encrypting them (and
1908 * then trigger processing of the encrypted queue if needed).
1910 * @param n neighbour to check.
1913 process_plaintext_neighbour_queue (struct Neighbour *n)
1915 char pbuf[GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE + sizeof (struct EncryptedMessage)]; /* plaintext */
1918 struct EncryptedMessage *em; /* encrypted message */
1919 struct EncryptedMessage *ph; /* plaintext header */
1920 struct MessageEntry *me;
1921 unsigned int priority;
1922 struct GNUNET_TIME_Absolute deadline;
1923 struct GNUNET_TIME_Relative retry_time;
1926 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1928 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1929 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1933 case PEER_STATE_DOWN:
1936 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1937 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1938 GNUNET_i2s(&n->peer));
1941 case PEER_STATE_KEY_SENT:
1942 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1943 n->retry_set_key_task
1944 = GNUNET_SCHEDULER_add_delayed (sched,
1945 n->set_key_retry_frequency,
1946 &set_key_retry_task, n);
1948 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1949 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1950 GNUNET_i2s(&n->peer));
1953 case PEER_STATE_KEY_RECEIVED:
1954 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1955 n->retry_set_key_task
1956 = GNUNET_SCHEDULER_add_delayed (sched,
1957 n->set_key_retry_frequency,
1958 &set_key_retry_task, n);
1960 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1961 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1962 GNUNET_i2s(&n->peer));
1965 case PEER_STATE_KEY_CONFIRMED:
1966 /* ready to continue */
1969 discard_expired_messages (n);
1970 if (n->messages == NULL)
1973 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1974 "Plaintext message queue for `%4s' is empty.\n",
1975 GNUNET_i2s(&n->peer));
1977 return; /* no pending messages */
1979 if (n->encrypted_head != NULL)
1982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1983 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
1984 GNUNET_i2s(&n->peer));
1986 return; /* wait for messages already encrypted to be
1989 ph = (struct EncryptedMessage *) pbuf;
1990 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1992 used = sizeof (struct EncryptedMessage);
1993 used += batch_message (n,
1995 GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE,
1996 &deadline, &retry_time, &priority);
1997 if (used == sizeof (struct EncryptedMessage))
2000 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2001 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
2002 GNUNET_i2s(&n->peer));
2004 /* no messages selected for sending, try again later... */
2005 n->retry_plaintext_task =
2006 GNUNET_SCHEDULER_add_delayed (sched,
2008 &retry_plaintext_processing, n);
2011 #if DEBUG_CORE_QUOTA
2012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2013 "Sending %u b/s as new limit to peer `%4s'\n",
2014 (unsigned int) ntohl (n->bw_in.value__),
2015 GNUNET_i2s (&n->peer));
2017 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX));
2018 ph->sequence_number = htonl (++n->last_sequence_number_sent);
2019 ph->inbound_bw_limit = n->bw_in;
2020 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
2022 /* setup encryption message header */
2023 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
2024 me->deadline = deadline;
2025 me->priority = priority;
2027 em = (struct EncryptedMessage *) &me[1];
2028 em->header.size = htons (used);
2029 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
2030 em->iv_seed = ph->iv_seed;
2031 esize = used - ENCRYPTED_HEADER_SIZE;
2032 GNUNET_CRYPTO_hmac (&n->encrypt_key,
2033 &ph->sequence_number,
2034 esize - sizeof (GNUNET_HashCode),
2036 GNUNET_CRYPTO_hash (&ph->iv_seed, sizeof (uint32_t), &iv);
2038 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2039 "Hashed %u bytes of plaintext (`%s') using IV `%d'\n",
2040 (unsigned int) (esize - sizeof (GNUNET_HashCode)),
2041 GNUNET_h2s (&ph->hmac),
2046 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2047 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
2048 (unsigned int) esize,
2049 GNUNET_i2s(&n->peer),
2050 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).value);
2052 GNUNET_assert (GNUNET_OK ==
2057 /* append to transmission list */
2058 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2062 process_encrypted_neighbour_queue (n);
2067 * Function that recalculates the bandwidth quota for the
2068 * given neighbour and transmits it to the transport service.
2070 * @param cls neighbour for the quota update
2074 neighbour_quota_update (void *cls,
2075 const struct GNUNET_SCHEDULER_TaskContext *tc);
2079 * Schedule the task that will recalculate the bandwidth
2080 * quota for this peer (and possibly force a disconnect of
2081 * idle peers by calculating a bandwidth of zero).
2084 schedule_quota_update (struct Neighbour *n)
2086 GNUNET_assert (n->quota_update_task ==
2087 GNUNET_SCHEDULER_NO_TASK);
2088 n->quota_update_task
2089 = GNUNET_SCHEDULER_add_delayed (sched,
2090 QUOTA_UPDATE_FREQUENCY,
2091 &neighbour_quota_update,
2097 * Initialize a new 'struct Neighbour'.
2099 * @param pid ID of the new neighbour
2100 * @return handle for the new neighbour
2102 static struct Neighbour *
2103 create_neighbour (const struct GNUNET_PeerIdentity *pid)
2105 struct Neighbour *n;
2106 struct GNUNET_TIME_Absolute now;
2109 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2110 "Creating neighbour entry for peer `%4s'\n",
2113 n = GNUNET_malloc (sizeof (struct Neighbour));
2114 n->next = neighbours;
2117 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
2119 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2120 now = GNUNET_TIME_absolute_get ();
2121 n->encrypt_key_created = now;
2122 n->last_activity = now;
2123 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2124 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2125 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2126 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
2127 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
2128 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2130 neighbour_quota_update (n, NULL);
2131 consider_free_neighbour (n);
2137 * Handle CORE_SEND request.
2140 * @param client the client issuing the request
2141 * @param message the "struct SendMessage"
2144 handle_client_send (void *cls,
2145 struct GNUNET_SERVER_Client *client,
2146 const struct GNUNET_MessageHeader *message)
2148 const struct SendMessage *sm;
2149 struct Neighbour *n;
2150 struct MessageEntry *prev;
2151 struct MessageEntry *pos;
2152 struct MessageEntry *e;
2153 struct MessageEntry *min_prio_entry;
2154 struct MessageEntry *min_prio_prev;
2155 unsigned int min_prio;
2156 unsigned int queue_size;
2159 msize = ntohs (message->size);
2161 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2165 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2168 sm = (const struct SendMessage *) message;
2169 msize -= sizeof (struct SendMessage);
2170 if (0 == memcmp (&sm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2172 /* FIXME: should we not allow loopback-injection here? */
2175 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2178 n = find_neighbour (&sm->peer);
2180 n = create_neighbour (&sm->peer);
2182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2183 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2185 (unsigned int) msize,
2186 GNUNET_i2s (&sm->peer));
2188 /* bound queue size */
2189 discard_expired_messages (n);
2190 min_prio = UINT32_MAX;
2191 min_prio_entry = NULL;
2192 min_prio_prev = NULL;
2198 if (pos->priority < min_prio)
2200 min_prio_entry = pos;
2201 min_prio_prev = prev;
2202 min_prio = pos->priority;
2208 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2211 if (ntohl(sm->priority) <= min_prio)
2213 /* discard new entry */
2215 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2216 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2218 (unsigned int) MAX_PEER_QUEUE_SIZE,
2219 (unsigned int) msize,
2220 (unsigned int) ntohs (message->type));
2223 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2226 /* discard "min_prio_entry" */
2228 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2229 "Queue full, discarding existing older request\n");
2231 if (min_prio_prev == NULL)
2232 n->messages = min_prio_entry->next;
2234 min_prio_prev->next = min_prio_entry->next;
2235 GNUNET_free (min_prio_entry);
2239 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2240 "Adding transmission request for `%4s' of size %u to queue\n",
2241 GNUNET_i2s (&sm->peer),
2242 (unsigned int) msize);
2244 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2245 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2246 e->priority = ntohl (sm->priority);
2248 memcpy (&e[1], &sm[1], msize);
2250 /* insert, keep list sorted by deadline */
2253 while ((pos != NULL) && (pos->deadline.value < e->deadline.value))
2264 /* consider scheduling now */
2265 process_plaintext_neighbour_queue (n);
2267 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2272 * Function called when the transport service is ready to
2273 * receive a message. Only resets 'n->th' to NULL.
2275 * @param cls neighbour to use message from
2276 * @param size number of bytes we can transmit
2277 * @param buf where to copy the message
2278 * @return number of bytes transmitted
2281 notify_transport_connect_done (void *cls, size_t size, void *buf)
2283 struct Neighbour *n = cls;
2288 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2289 _("Failed to connect to `%4s': transport failed to connect\n"),
2290 GNUNET_i2s (&n->peer));
2293 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2294 _("TRANSPORT connection to peer `%4s' is up, trying to establish CORE connection\n"),
2295 GNUNET_i2s (&n->peer));
2296 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2297 GNUNET_SCHEDULER_cancel (sched,
2298 n->retry_set_key_task);
2299 n->retry_set_key_task = GNUNET_SCHEDULER_add_now (sched,
2300 &set_key_retry_task,
2307 * Handle CORE_REQUEST_CONNECT request.
2310 * @param client the client issuing the request
2311 * @param message the "struct ConnectMessage"
2314 handle_client_request_connect (void *cls,
2315 struct GNUNET_SERVER_Client *client,
2316 const struct GNUNET_MessageHeader *message)
2318 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2319 struct Neighbour *n;
2320 struct GNUNET_TIME_Relative timeout;
2322 if (0 == memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2325 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2328 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2329 n = find_neighbour (&cm->peer);
2331 n = create_neighbour (&cm->peer);
2332 if ( (GNUNET_YES == n->is_connected) ||
2334 return; /* already connected, or at least trying */
2335 GNUNET_STATISTICS_update (stats, gettext_noop ("# connection requests received"), 1, GNUNET_NO);
2337 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2338 "Core received `%s' request for `%4s', will try to establish connection\n",
2340 GNUNET_i2s (&cm->peer));
2342 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2343 /* ask transport to connect to the peer */
2344 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2346 sizeof (struct GNUNET_MessageHeader), 0,
2348 ¬ify_transport_connect_done,
2350 GNUNET_break (NULL != n->th);
2355 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2356 * the neighbour's struct and retry send_key. Or, if we did not get a
2357 * HELLO, just do nothing.
2359 * @param cls the 'struct Neighbour' to retry sending the key for
2360 * @param peer the peer for which this is the HELLO
2361 * @param hello HELLO message of that peer
2362 * @param trust amount of trust we currently have in that peer
2365 process_hello_retry_send_key (void *cls,
2366 const struct GNUNET_PeerIdentity *peer,
2367 const struct GNUNET_HELLO_Message *hello,
2370 struct Neighbour *n = cls;
2375 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2376 "Entered `%s' and `%s' is NULL!\n",
2377 "process_hello_retry_send_key",
2381 if (n->public_key != NULL)
2383 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2385 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2386 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2388 GNUNET_STATISTICS_update (stats,
2389 gettext_noop ("# SET_KEY messages deferred (need public key)"),
2396 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2397 _("Failed to obtain public key for peer `%4s', delaying processing of SET_KEY\n"),
2398 GNUNET_i2s (&n->peer));
2399 GNUNET_STATISTICS_update (stats,
2400 gettext_noop ("# Delayed connecting due to lack of public key"),
2403 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2404 n->retry_set_key_task
2405 = GNUNET_SCHEDULER_add_delayed (sched,
2406 n->set_key_retry_frequency,
2407 &set_key_retry_task, n);
2413 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2414 "Entered `%s' for peer `%4s'\n",
2415 "process_hello_retry_send_key",
2418 if (n->public_key != NULL)
2420 /* already have public key, why are we here? */
2426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2427 "Received new `%s' message for `%4s', initiating key exchange.\n",
2432 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2433 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2435 GNUNET_STATISTICS_update (stats,
2436 gettext_noop ("# Error extracting public key from HELLO"),
2439 GNUNET_free (n->public_key);
2440 n->public_key = NULL;
2442 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2443 "GNUNET_HELLO_get_key returned awfully\n");
2451 * Send our key (and encrypted PING) to the other peer.
2453 * @param n the other peer
2456 send_key (struct Neighbour *n)
2458 struct MessageEntry *pos;
2459 struct SetKeyMessage *sm;
2460 struct MessageEntry *me;
2461 struct PingMessage pp;
2462 struct PingMessage *pm;
2464 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2466 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2467 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2469 if (n->pitr != NULL)
2472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2473 "Key exchange in progress with `%4s'.\n",
2474 GNUNET_i2s (&n->peer));
2476 return; /* already in progress */
2478 if (GNUNET_YES != n->is_connected)
2481 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2482 "Not yet connected to peer `%4s'!\n",
2483 GNUNET_i2s (&n->peer));
2487 GNUNET_STATISTICS_update (stats,
2488 gettext_noop ("# Asking transport to connect (for SET_KEY)"),
2491 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2493 sizeof (struct SetKeyMessage) + sizeof (struct PingMessage),
2495 GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
2496 ¬ify_encrypted_transmit_ready,
2502 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2503 "Asked to perform key exchange with `%4s'.\n",
2504 GNUNET_i2s (&n->peer));
2506 if (n->public_key == NULL)
2508 /* lookup n's public key, then try again */
2510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2511 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2512 GNUNET_i2s (&n->peer));
2514 GNUNET_assert (n->pitr == NULL);
2515 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
2518 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2519 &process_hello_retry_send_key, n);
2522 pos = n->encrypted_head;
2525 if (GNUNET_YES == pos->is_setkey)
2527 if (pos->sender_status == n->status)
2530 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2531 "`%s' message for `%4s' queued already\n",
2533 GNUNET_i2s (&n->peer));
2535 goto trigger_processing;
2537 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
2542 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2543 "Removing queued `%s' message for `%4s', will create a new one\n",
2545 GNUNET_i2s (&n->peer));
2555 case PEER_STATE_DOWN:
2556 n->status = PEER_STATE_KEY_SENT;
2558 case PEER_STATE_KEY_SENT:
2560 case PEER_STATE_KEY_RECEIVED:
2562 case PEER_STATE_KEY_CONFIRMED:
2570 /* first, set key message */
2571 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2572 sizeof (struct SetKeyMessage) +
2573 sizeof (struct PingMessage));
2574 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
2575 me->priority = SET_KEY_PRIORITY;
2576 me->size = sizeof (struct SetKeyMessage) + sizeof (struct PingMessage);
2577 me->is_setkey = GNUNET_YES;
2578 me->got_slack = GNUNET_YES; /* do not defer this one! */
2579 me->sender_status = n->status;
2580 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2584 sm = (struct SetKeyMessage *) &me[1];
2585 sm->header.size = htons (sizeof (struct SetKeyMessage));
2586 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
2587 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
2588 PEER_STATE_KEY_SENT : n->status));
2590 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2591 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2592 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2593 sizeof (struct GNUNET_PeerIdentity));
2594 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
2595 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
2596 sm->target = n->peer;
2597 GNUNET_assert (GNUNET_OK ==
2598 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
2600 GNUNET_CRYPTO_AesSessionKey),
2602 &sm->encrypted_key));
2603 GNUNET_assert (GNUNET_OK ==
2604 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
2606 pm = (struct PingMessage *) &sm[1];
2607 pm->header.size = htons (sizeof (struct PingMessage));
2608 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
2609 pp.challenge = htonl (n->ping_challenge);
2610 pp.target = n->peer;
2612 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2613 "Encrypting `%s' and `%s' messages with challenge %u for `%4s' using key %u.\n",
2615 (unsigned int) n->ping_challenge,
2616 GNUNET_i2s (&n->peer),
2617 (unsigned int) n->encrypt_key.crc32);
2620 &n->peer.hashPubKey,
2623 sizeof (struct PingMessage) -
2624 sizeof (struct GNUNET_MessageHeader));
2625 GNUNET_STATISTICS_update (stats,
2626 gettext_noop ("# SET_KEY and PING messages created"),
2630 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2631 "Have %llu ms left for `%s' transmission.\n",
2632 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).value,
2636 /* trigger queue processing */
2637 process_encrypted_neighbour_queue (n);
2638 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
2639 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
2640 n->retry_set_key_task
2641 = GNUNET_SCHEDULER_add_delayed (sched,
2642 n->set_key_retry_frequency,
2643 &set_key_retry_task, n);
2648 * We received a SET_KEY message. Validate and update
2649 * our key material and status.
2651 * @param n the neighbour from which we received message m
2652 * @param m the set key message we received
2655 handle_set_key (struct Neighbour *n,
2656 const struct SetKeyMessage *m);
2660 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2661 * the neighbour's struct and retry handling the set_key message. Or,
2662 * if we did not get a HELLO, just free the set key message.
2664 * @param cls pointer to the set key message
2665 * @param peer the peer for which this is the HELLO
2666 * @param hello HELLO message of that peer
2667 * @param trust amount of trust we currently have in that peer
2670 process_hello_retry_handle_set_key (void *cls,
2671 const struct GNUNET_PeerIdentity *peer,
2672 const struct GNUNET_HELLO_Message *hello,
2675 struct Neighbour *n = cls;
2676 struct SetKeyMessage *sm = n->skm;
2682 if (n->public_key != NULL)
2685 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2686 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
2688 GNUNET_i2s (&n->peer),
2691 handle_set_key (n, sm);
2695 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2696 _("Ignoring `%s' message due to lack of public key for peer `%4s' (failed to obtain one).\n"),
2698 GNUNET_i2s (&n->peer));
2703 if (n->public_key != NULL)
2704 return; /* multiple HELLOs match!? */
2706 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2707 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2709 GNUNET_break_op (0);
2710 GNUNET_free (n->public_key);
2711 n->public_key = NULL;
2717 * We received a PING message. Validate and transmit
2720 * @param n sender of the PING
2721 * @param m the encrypted PING message itself
2724 handle_ping (struct Neighbour *n, const struct PingMessage *m)
2726 struct PingMessage t;
2727 struct PongMessage tx;
2728 struct PongMessage *tp;
2729 struct MessageEntry *me;
2732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2733 "Core service receives `%s' request from `%4s'.\n",
2734 "PING", GNUNET_i2s (&n->peer));
2738 &my_identity.hashPubKey,
2741 sizeof (struct PingMessage) -
2742 sizeof (struct GNUNET_MessageHeader)))
2745 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2746 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u\n",
2748 GNUNET_i2s (&t.target),
2749 (unsigned int) ntohl (t.challenge),
2750 (unsigned int) n->decrypt_key.crc32);
2752 GNUNET_STATISTICS_update (stats,
2753 gettext_noop ("# PING messages decrypted"),
2756 if (0 != memcmp (&t.target,
2757 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2759 GNUNET_break_op (0);
2762 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2763 sizeof (struct PongMessage));
2764 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2768 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
2769 me->priority = PONG_PRIORITY;
2770 me->size = sizeof (struct PongMessage);
2771 tx.reserved = htonl (0);
2772 tx.inbound_bw_limit = n->bw_in;
2773 tx.challenge = t.challenge;
2774 tx.target = t.target;
2775 tp = (struct PongMessage *) &me[1];
2776 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
2777 tp->header.size = htons (sizeof (struct PongMessage));
2779 &my_identity.hashPubKey,
2782 sizeof (struct PongMessage) -
2783 sizeof (struct GNUNET_MessageHeader));
2784 GNUNET_STATISTICS_update (stats,
2785 gettext_noop ("# PONG messages created"),
2789 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2790 "Encrypting `%s' with challenge %u using key %u\n",
2792 (unsigned int) ntohl (t.challenge),
2793 (unsigned int) n->encrypt_key.crc32);
2795 /* trigger queue processing */
2796 process_encrypted_neighbour_queue (n);
2801 * We received a PONG message. Validate and update our status.
2803 * @param n sender of the PONG
2804 * @param m the encrypted PONG message itself
2807 handle_pong (struct Neighbour *n,
2808 const struct PongMessage *m)
2810 struct PongMessage t;
2811 struct ConnectNotifyMessage cnm;
2814 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2815 "Core service receives `%s' response from `%4s'.\n",
2816 "PONG", GNUNET_i2s (&n->peer));
2818 /* mark as garbage, just to be sure */
2819 memset (&t, 255, sizeof (t));
2822 &n->peer.hashPubKey,
2825 sizeof (struct PongMessage) -
2826 sizeof (struct GNUNET_MessageHeader)))
2828 GNUNET_break_op (0);
2831 GNUNET_STATISTICS_update (stats,
2832 gettext_noop ("# PONG messages decrypted"),
2835 if (0 != ntohl (t.reserved))
2837 GNUNET_break_op (0);
2841 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2842 "Decrypted `%s' from `%4s' with challenge %u using key %u\n",
2844 GNUNET_i2s (&t.target),
2845 (unsigned int) ntohl (t.challenge),
2846 (unsigned int) n->decrypt_key.crc32);
2848 if ((0 != memcmp (&t.target,
2850 sizeof (struct GNUNET_PeerIdentity))) ||
2851 (n->ping_challenge != ntohl (t.challenge)))
2853 /* PONG malformed */
2855 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2856 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
2858 GNUNET_i2s (&n->peer),
2859 (unsigned int) n->ping_challenge);
2860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2861 "Received malformed `%s' received from `%4s' with challenge %u\n",
2862 "PONG", GNUNET_i2s (&t.target),
2863 (unsigned int) ntohl (t.challenge));
2865 GNUNET_break_op (0);
2870 case PEER_STATE_DOWN:
2871 GNUNET_break (0); /* should be impossible */
2873 case PEER_STATE_KEY_SENT:
2874 GNUNET_break (0); /* should be impossible, how did we decrypt? */
2876 case PEER_STATE_KEY_RECEIVED:
2877 GNUNET_STATISTICS_update (stats,
2878 gettext_noop ("# Session keys confirmed via PONG"),
2881 n->status = PEER_STATE_KEY_CONFIRMED;
2882 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
2884 n->bw_out_external_limit = t.inbound_bw_limit;
2885 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
2886 n->bw_out_internal_limit);
2887 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
2889 GNUNET_TRANSPORT_set_quota (transport,
2893 GNUNET_TIME_UNIT_FOREVER_REL,
2897 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2898 "Confirmed key via `%s' message for peer `%4s'\n",
2899 "PONG", GNUNET_i2s (&n->peer));
2901 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2903 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2904 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2906 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
2907 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
2908 cnm.distance = htonl (n->last_distance);
2909 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
2911 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
2912 process_encrypted_neighbour_queue (n);
2914 case PEER_STATE_KEY_CONFIRMED:
2915 n->last_activity = GNUNET_TIME_absolute_get ();
2916 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
2917 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
2919 = GNUNET_SCHEDULER_add_delayed (sched,
2920 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
2932 * We received a SET_KEY message. Validate and update
2933 * our key material and status.
2935 * @param n the neighbour from which we received message m
2936 * @param m the set key message we received
2939 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
2941 struct SetKeyMessage *m_cpy;
2942 struct GNUNET_TIME_Absolute t;
2943 struct GNUNET_CRYPTO_AesSessionKey k;
2944 struct PingMessage *ping;
2945 struct PongMessage *pong;
2946 enum PeerStateMachine sender_status;
2949 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2950 "Core service receives `%s' request from `%4s'.\n",
2951 "SET_KEY", GNUNET_i2s (&n->peer));
2953 if (n->public_key == NULL)
2955 if (n->pitr != NULL)
2958 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2959 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
2965 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2966 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
2968 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
2969 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
2970 /* lookup n's public key, then try again */
2971 GNUNET_assert (n->skm == NULL);
2973 n->pitr = GNUNET_PEERINFO_iterate (peerinfo,
2976 GNUNET_TIME_UNIT_MINUTES,
2977 &process_hello_retry_handle_set_key, n);
2978 GNUNET_STATISTICS_update (stats,
2979 gettext_noop ("# SET_KEY messages deferred (need public key)"),
2984 if (0 != memcmp (&m->target,
2986 sizeof (struct GNUNET_PeerIdentity)))
2988 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2989 _("Received `%s' message that was for `%s', not for me. Ignoring.\n"),
2991 GNUNET_i2s (&m->target));
2994 if ((ntohl (m->purpose.size) !=
2995 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2996 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2997 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2998 sizeof (struct GNUNET_PeerIdentity)) ||
3000 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
3001 &m->purpose, &m->signature, n->public_key)))
3003 /* invalid signature */
3004 GNUNET_break_op (0);
3007 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
3008 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
3009 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
3010 (t.value < n->decrypt_key_created.value))
3012 /* this could rarely happen due to massive re-ordering of
3013 messages on the network level, but is most likely either
3014 a bug or some adversary messing with us. Report. */
3015 GNUNET_break_op (0);
3019 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3020 "Decrypting key material.\n");
3022 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
3025 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
3026 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
3027 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
3029 /* failed to decrypt !? */
3030 GNUNET_break_op (0);
3033 GNUNET_STATISTICS_update (stats,
3034 gettext_noop ("# SET_KEY messages decrypted"),
3038 if (n->decrypt_key_created.value != t.value)
3040 /* fresh key, reset sequence numbers */
3041 n->last_sequence_number_received = 0;
3042 n->last_packets_bitmap = 0;
3043 n->decrypt_key_created = t;
3045 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
3048 case PEER_STATE_DOWN:
3049 n->status = PEER_STATE_KEY_RECEIVED;
3051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3052 "Responding to `%s' with my own key.\n", "SET_KEY");
3056 case PEER_STATE_KEY_SENT:
3057 case PEER_STATE_KEY_RECEIVED:
3058 n->status = PEER_STATE_KEY_RECEIVED;
3059 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3060 (sender_status != PEER_STATE_KEY_CONFIRMED))
3063 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3064 "Responding to `%s' with my own key (other peer has status %u).\n",
3066 (unsigned int) sender_status);
3071 case PEER_STATE_KEY_CONFIRMED:
3072 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
3073 (sender_status != PEER_STATE_KEY_CONFIRMED))
3076 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3077 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
3079 (unsigned int) sender_status);
3088 if (n->pending_ping != NULL)
3090 ping = n->pending_ping;
3091 n->pending_ping = NULL;
3092 handle_ping (n, ping);
3095 if (n->pending_pong != NULL)
3097 pong = n->pending_pong;
3098 n->pending_pong = NULL;
3099 handle_pong (n, pong);
3106 * Send a P2P message to a client.
3108 * @param sender who sent us the message?
3109 * @param client who should we give the message to?
3110 * @param m contains the message to transmit
3111 * @param msize number of bytes in buf to transmit
3114 send_p2p_message_to_client (struct Neighbour *sender,
3115 struct Client *client,
3116 const void *m, size_t msize)
3118 char buf[msize + sizeof (struct NotifyTrafficMessage)];
3119 struct NotifyTrafficMessage *ntm;
3122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3123 "Core service passes message from `%4s' of type %u to client.\n",
3124 GNUNET_i2s(&sender->peer),
3125 (unsigned int) ntohs (((const struct GNUNET_MessageHeader *) m)->type));
3127 ntm = (struct NotifyTrafficMessage *) buf;
3128 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
3129 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
3130 ntm->distance = htonl (sender->last_distance);
3131 ntm->latency = GNUNET_TIME_relative_hton (sender->last_latency);
3132 ntm->peer = sender->peer;
3133 memcpy (&ntm[1], m, msize);
3134 send_to_client (client, &ntm->header, GNUNET_YES);
3139 * Deliver P2P message to interested clients.
3141 * @param cls always NULL
3142 * @param client who sent us the message (struct Neighbour)
3143 * @param m the message
3146 deliver_message (void *cls,
3148 const struct GNUNET_MessageHeader *m)
3150 struct Neighbour *sender = client;
3151 size_t msize = ntohs (m->size);
3153 struct Client *cpos;
3159 type = ntohs (m->type);
3161 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3162 "Received encapsulated message of type %u and size %u from `%4s'\n",
3163 (unsigned int) type,
3165 GNUNET_i2s (&sender->peer));
3167 GNUNET_snprintf (buf,
3169 gettext_noop ("# bytes of messages of type %u received"),
3170 (unsigned int) type);
3171 GNUNET_STATISTICS_set (stats,
3175 dropped = GNUNET_YES;
3177 while (cpos != NULL)
3179 deliver_full = GNUNET_NO;
3180 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
3181 deliver_full = GNUNET_YES;
3184 for (tpos = 0; tpos < cpos->tcnt; tpos++)
3186 if (type != cpos->types[tpos])
3188 deliver_full = GNUNET_YES;
3192 if (GNUNET_YES == deliver_full)
3194 send_p2p_message_to_client (sender, cpos, m, msize);
3195 dropped = GNUNET_NO;
3197 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
3199 send_p2p_message_to_client (sender, cpos, m,
3200 sizeof (struct GNUNET_MessageHeader));
3204 if (dropped == GNUNET_YES)
3207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3208 "Message of type %u from `%4s' not delivered to any client.\n",
3209 (unsigned int) type,
3210 GNUNET_i2s (&sender->peer));
3212 GNUNET_STATISTICS_update (stats,
3213 gettext_noop ("# messages not delivered to any client"),
3220 * We received an encrypted message. Decrypt, validate and
3221 * pass on to the appropriate clients.
3224 handle_encrypted_message (struct Neighbour *n,
3225 const struct EncryptedMessage *m)
3227 size_t size = ntohs (m->header.size);
3229 struct EncryptedMessage *pt; /* plaintext */
3232 struct GNUNET_TIME_Absolute t;
3236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3237 "Core service receives `%s' request from `%4s'.\n",
3238 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
3240 GNUNET_CRYPTO_hash (&m->iv_seed, sizeof (uint32_t), &iv);
3246 &buf[ENCRYPTED_HEADER_SIZE],
3247 size - ENCRYPTED_HEADER_SIZE))
3249 pt = (struct EncryptedMessage *) buf;
3251 GNUNET_CRYPTO_hmac (&n->decrypt_key,
3252 &pt->sequence_number,
3253 size - ENCRYPTED_HEADER_SIZE - sizeof (GNUNET_HashCode), &ph);
3255 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3256 "V-Hashed %u bytes of plaintext (`%s') using IV `%d'\n",
3257 (unsigned int) (size - ENCRYPTED_HEADER_SIZE - sizeof (GNUNET_HashCode)),
3261 if (0 != memcmp (&ph,
3263 sizeof (GNUNET_HashCode)))
3265 /* checksum failed */
3266 GNUNET_break_op (0);
3270 /* validate sequence number */
3271 snum = ntohl (pt->sequence_number);
3272 if (n->last_sequence_number_received == snum)
3274 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3275 "Received duplicate message, ignoring.\n");
3276 /* duplicate, ignore */
3277 GNUNET_STATISTICS_set (stats,
3278 gettext_noop ("# bytes dropped (duplicates)"),
3283 if ((n->last_sequence_number_received > snum) &&
3284 (n->last_sequence_number_received - snum > 32))
3286 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3287 "Received ancient out of sequence message, ignoring.\n");
3288 /* ancient out of sequence, ignore */
3289 GNUNET_STATISTICS_set (stats,
3290 gettext_noop ("# bytes dropped (out of sequence)"),
3295 if (n->last_sequence_number_received > snum)
3297 unsigned int rotbit =
3298 1 << (n->last_sequence_number_received - snum - 1);
3299 if ((n->last_packets_bitmap & rotbit) != 0)
3301 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3302 "Received duplicate message, ignoring.\n");
3303 GNUNET_STATISTICS_set (stats,
3304 gettext_noop ("# bytes dropped (duplicates)"),
3307 /* duplicate, ignore */
3310 n->last_packets_bitmap |= rotbit;
3312 if (n->last_sequence_number_received < snum)
3314 n->last_packets_bitmap <<= (snum - n->last_sequence_number_received);
3315 n->last_sequence_number_received = snum;
3318 /* check timestamp */
3319 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
3320 if (GNUNET_TIME_absolute_get_duration (t).value > MAX_MESSAGE_AGE.value)
3322 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3324 ("Message received far too old (%llu ms). Content ignored.\n"),
3325 GNUNET_TIME_absolute_get_duration (t).value);
3326 GNUNET_STATISTICS_set (stats,
3327 gettext_noop ("# bytes dropped (ancient message)"),
3333 /* process decrypted message(s) */
3334 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
3336 #if DEBUG_CORE_SET_QUOTA
3337 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3338 "Received %u b/s as new inbound limit for peer `%4s'\n",
3339 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
3340 GNUNET_i2s (&n->peer));
3342 n->bw_out_external_limit = pt->inbound_bw_limit;
3343 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3344 n->bw_out_internal_limit);
3345 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3347 GNUNET_TRANSPORT_set_quota (transport,
3351 GNUNET_TIME_UNIT_FOREVER_REL,
3354 n->last_activity = GNUNET_TIME_absolute_get ();
3355 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3356 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3358 = GNUNET_SCHEDULER_add_delayed (sched,
3359 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3362 GNUNET_STATISTICS_set (stats,
3363 gettext_noop ("# bytes of payload decrypted"),
3364 size - sizeof (struct EncryptedMessage),
3366 if (GNUNET_OK != GNUNET_SERVER_mst_receive (mst,
3368 &buf[sizeof (struct EncryptedMessage)],
3369 size - sizeof (struct EncryptedMessage),
3370 GNUNET_YES, GNUNET_NO))
3371 GNUNET_break_op (0);
3376 * Function called by the transport for each received message.
3378 * @param cls closure
3379 * @param peer (claimed) identity of the other peer
3380 * @param message the message
3381 * @param latency estimated latency for communicating with the
3382 * given peer (round-trip)
3383 * @param distance in overlay hops, as given by transport plugin
3386 handle_transport_receive (void *cls,
3387 const struct GNUNET_PeerIdentity *peer,
3388 const struct GNUNET_MessageHeader *message,
3389 struct GNUNET_TIME_Relative latency,
3390 unsigned int distance)
3392 struct Neighbour *n;
3393 struct GNUNET_TIME_Absolute now;
3399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3400 "Received message of type %u from `%4s', demultiplexing.\n",
3401 (unsigned int) ntohs (message->type),
3404 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3409 n = find_neighbour (peer);
3411 n = create_neighbour (peer);
3412 n->last_latency = latency;
3413 n->last_distance = distance;
3414 up = (n->status == PEER_STATE_KEY_CONFIRMED);
3415 type = ntohs (message->type);
3416 size = ntohs (message->size);
3419 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
3420 if (size != sizeof (struct SetKeyMessage))
3422 GNUNET_break_op (0);
3425 GNUNET_STATISTICS_update (stats, gettext_noop ("# session keys received"), 1, GNUNET_NO);
3426 handle_set_key (n, (const struct SetKeyMessage *) message);
3428 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3429 if (size < sizeof (struct EncryptedMessage) +
3430 sizeof (struct GNUNET_MessageHeader))
3432 GNUNET_break_op (0);
3435 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3436 (n->status != PEER_STATE_KEY_CONFIRMED))
3438 GNUNET_break_op (0);
3441 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3443 case GNUNET_MESSAGE_TYPE_CORE_PING:
3444 if (size != sizeof (struct PingMessage))
3446 GNUNET_break_op (0);
3449 GNUNET_STATISTICS_update (stats, gettext_noop ("# PING messages received"), 1, GNUNET_NO);
3450 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3451 (n->status != PEER_STATE_KEY_CONFIRMED))
3454 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3455 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3456 "PING", GNUNET_i2s (&n->peer));
3458 GNUNET_free_non_null (n->pending_ping);
3459 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3460 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3463 handle_ping (n, (const struct PingMessage *) message);
3465 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3466 if (size != sizeof (struct PongMessage))
3468 GNUNET_break_op (0);
3471 GNUNET_STATISTICS_update (stats, gettext_noop ("# PONG messages received"), 1, GNUNET_NO);
3472 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3473 (n->status != PEER_STATE_KEY_CONFIRMED) )
3476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3477 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3478 "PONG", GNUNET_i2s (&n->peer));
3480 GNUNET_free_non_null (n->pending_pong);
3481 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
3482 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
3485 handle_pong (n, (const struct PongMessage *) message);
3488 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3489 _("Unsupported message of type %u received.\n"),
3490 (unsigned int) type);
3493 if (n->status == PEER_STATE_KEY_CONFIRMED)
3495 now = GNUNET_TIME_absolute_get ();
3496 n->last_activity = now;
3499 GNUNET_STATISTICS_update (stats, gettext_noop ("# established sessions"), 1, GNUNET_NO);
3500 n->time_established = now;
3502 if (n->keep_alive_task != GNUNET_SCHEDULER_NO_TASK)
3503 GNUNET_SCHEDULER_cancel (sched, n->keep_alive_task);
3505 = GNUNET_SCHEDULER_add_delayed (sched,
3506 GNUNET_TIME_relative_divide (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, 2),
3514 * Function that recalculates the bandwidth quota for the
3515 * given neighbour and transmits it to the transport service.
3517 * @param cls neighbour for the quota update
3521 neighbour_quota_update (void *cls,
3522 const struct GNUNET_SCHEDULER_TaskContext *tc)
3524 struct Neighbour *n = cls;
3525 struct GNUNET_BANDWIDTH_Value32NBO q_in;
3528 unsigned long long distributable;
3529 uint64_t need_per_peer;
3530 uint64_t need_per_second;
3533 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3534 "Neighbour quota update calculation running for peer `%4s'\n",
3535 GNUNET_i2s (&n->peer));
3537 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
3538 /* calculate relative preference among all neighbours;
3539 divides by a bit more to avoid division by zero AND to
3540 account for possibility of new neighbours joining any time
3541 AND to convert to double... */
3542 if (preference_sum == 0)
3544 pref_rel = 1.0 / (double) neighbour_count;
3548 pref_rel = n->current_preference / preference_sum;
3550 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
3551 GNUNET_TIME_UNIT_SECONDS);
3552 need_per_second = need_per_peer * neighbour_count;
3554 if (bandwidth_target_out_bps > need_per_second)
3555 distributable = bandwidth_target_out_bps - need_per_second;
3556 share = distributable * pref_rel;
3557 if (share + need_per_peer > UINT32_MAX)
3558 q_in = GNUNET_BANDWIDTH_value_init (UINT32_MAX);
3560 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
3561 /* check if we want to disconnect for good due to inactivity */
3562 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) &&
3563 (GNUNET_TIME_absolute_get_duration (n->time_established).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) )
3566 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3567 "Forcing disconnect of `%4s' due to inactivity\n",
3568 GNUNET_i2s (&n->peer));
3570 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
3572 #if DEBUG_CORE_QUOTA
3573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3574 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
3575 GNUNET_i2s (&n->peer),
3576 (unsigned int) ntohl (q_in.value__),
3577 bandwidth_target_out_bps,
3578 (unsigned int) ntohl (n->bw_in.value__),
3579 (unsigned int) ntohl (n->bw_out.value__),
3580 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
3582 if (n->bw_in.value__ != q_in.value__)
3585 if (GNUNET_YES == n->is_connected)
3586 GNUNET_TRANSPORT_set_quota (transport,
3590 GNUNET_TIME_UNIT_FOREVER_REL,
3593 schedule_quota_update (n);
3598 * Function called by transport to notify us that
3599 * a peer connected to us (on the network level).
3601 * @param cls closure
3602 * @param peer the peer that connected
3603 * @param latency current latency of the connection
3604 * @param distance in overlay hops, as given by transport plugin
3607 handle_transport_notify_connect (void *cls,
3608 const struct GNUNET_PeerIdentity *peer,
3609 struct GNUNET_TIME_Relative latency,
3610 unsigned int distance)
3612 struct Neighbour *n;
3614 if (0 == memcmp (peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
3619 n = find_neighbour (peer);
3622 if (GNUNET_YES == n->is_connected)
3624 /* duplicate connect notification!? */
3631 n = create_neighbour (peer);
3633 GNUNET_STATISTICS_update (stats,
3634 gettext_noop ("# peers connected (transport)"),
3637 n->is_connected = GNUNET_YES;
3638 n->last_latency = latency;
3639 n->last_distance = distance;
3640 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
3643 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
3647 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3648 "Received connection from `%4s'.\n",
3649 GNUNET_i2s (&n->peer));
3651 GNUNET_TRANSPORT_set_quota (transport,
3655 GNUNET_TIME_UNIT_FOREVER_REL,
3662 * Function called by transport telling us that a peer
3665 * @param cls closure
3666 * @param peer the peer that disconnected
3669 handle_transport_notify_disconnect (void *cls,
3670 const struct GNUNET_PeerIdentity *peer)
3672 struct DisconnectNotifyMessage cnm;
3673 struct Neighbour *n;
3676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3677 "Peer `%4s' disconnected from us.\n", GNUNET_i2s (peer));
3679 n = find_neighbour (peer);
3685 GNUNET_break (n->is_connected);
3686 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
3687 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
3689 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
3690 n->is_connected = GNUNET_NO;
3691 GNUNET_STATISTICS_update (stats,
3692 gettext_noop ("# peers connected (transport)"),
3699 * Last task run during shutdown. Disconnects us from
3703 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3705 struct Neighbour *n;
3709 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3710 "Core service shutting down.\n");
3712 GNUNET_assert (transport != NULL);
3713 GNUNET_TRANSPORT_disconnect (transport);
3715 while (NULL != (n = neighbours))
3717 neighbours = n->next;
3718 GNUNET_assert (neighbour_count > 0);
3722 GNUNET_STATISTICS_set (stats, gettext_noop ("# neighbour entries allocated"), neighbour_count, GNUNET_NO);
3723 GNUNET_SERVER_notification_context_destroy (notifier);
3725 while (NULL != (c = clients))
3726 handle_client_disconnect (NULL, c->client_handle);
3727 if (my_private_key != NULL)
3728 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3730 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
3731 if (peerinfo != NULL)
3732 GNUNET_PEERINFO_disconnect (peerinfo);
3734 GNUNET_SERVER_mst_destroy (mst);
3739 * Initiate core service.
3741 * @param cls closure
3742 * @param s scheduler to use
3743 * @param server the initialized server
3744 * @param c configuration to use
3748 struct GNUNET_SCHEDULER_Handle *s,
3749 struct GNUNET_SERVER_Handle *server,
3750 const struct GNUNET_CONFIGURATION_Handle *c)
3752 static const struct GNUNET_SERVER_MessageHandler handlers[] = {
3753 {&handle_client_init, NULL,
3754 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
3755 {&handle_client_request_info, NULL,
3756 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
3757 sizeof (struct RequestInfoMessage)},
3758 {&handle_client_send, NULL,
3759 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
3760 {&handle_client_request_connect, NULL,
3761 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
3762 sizeof (struct ConnectMessage)},
3769 /* parse configuration */
3772 GNUNET_CONFIGURATION_get_value_number (c,
3775 &bandwidth_target_in_bps)) ||
3777 GNUNET_CONFIGURATION_get_value_number (c,
3780 &bandwidth_target_out_bps)) ||
3782 GNUNET_CONFIGURATION_get_value_filename (c,
3784 "HOSTKEY", &keyfile)))
3786 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3788 ("Core service is lacking key configuration settings. Exiting.\n"));
3789 GNUNET_SCHEDULER_shutdown (s);
3792 peerinfo = GNUNET_PEERINFO_connect (sched, cfg);
3793 if (NULL == peerinfo)
3795 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3796 _("Could not access PEERINFO service. Exiting.\n"));
3797 GNUNET_SCHEDULER_shutdown (s);
3798 GNUNET_free (keyfile);
3801 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3802 GNUNET_free (keyfile);
3803 if (my_private_key == NULL)
3805 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3806 _("Core service could not access hostkey. Exiting.\n"));
3807 GNUNET_PEERINFO_disconnect (peerinfo);
3808 GNUNET_SCHEDULER_shutdown (s);
3811 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3812 GNUNET_CRYPTO_hash (&my_public_key,
3813 sizeof (my_public_key), &my_identity.hashPubKey);
3814 /* setup notification */
3815 notifier = GNUNET_SERVER_notification_context_create (server,
3817 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
3818 /* setup transport connection */
3819 transport = GNUNET_TRANSPORT_connect (sched,
3822 &handle_transport_receive,
3823 &handle_transport_notify_connect,
3824 &handle_transport_notify_disconnect);
3825 GNUNET_assert (NULL != transport);
3826 stats = GNUNET_STATISTICS_create (sched, "core", cfg);
3827 mst = GNUNET_SERVER_mst_create (GNUNET_SERVER_MAX_MESSAGE_SIZE - 1,
3830 GNUNET_SCHEDULER_add_delayed (sched,
3831 GNUNET_TIME_UNIT_FOREVER_REL,
3832 &cleaning_task, NULL);
3833 /* process client requests */
3834 GNUNET_SERVER_add_handlers (server, handlers);
3835 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3836 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
3842 * The main function for the transport service.
3844 * @param argc number of arguments from the command line
3845 * @param argv command line arguments
3846 * @return 0 ok, 1 on error
3849 main (int argc, char *const *argv)
3851 return (GNUNET_OK ==
3852 GNUNET_SERVICE_run (argc,
3855 GNUNET_SERVICE_OPTION_NONE,
3856 &run, NULL)) ? 0 : 1;
3859 /* end of gnunet-service-core.c */