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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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,
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22 * @file core/gnunet-service-core.c
23 * @brief high-level P2P messaging
24 * @author Christian Grothoff
26 * Considerations for later:
27 * - check that hostkey used by transport (for HELLOs) is the
28 * same as the hostkey that we are using!
29 * - add code to send PINGs if we are about to time-out otherwise
30 * - optimize lookup (many O(n) list traversals
31 * could ideally be changed to O(1) hash map lookups)
34 #include "gnunet_constants.h"
35 #include "gnunet_util_lib.h"
36 #include "gnunet_hello_lib.h"
37 #include "gnunet_peerinfo_service.h"
38 #include "gnunet_protocols.h"
39 #include "gnunet_signatures.h"
40 #include "gnunet_transport_service.h"
44 #define DEBUG_HANDSHAKE GNUNET_NO
46 #define DEBUG_CORE_QUOTA GNUNET_NO
49 * Receive and send buffer windows grow over time. For
50 * how long can 'unused' bandwidth accumulate before we
51 * need to cap it? (specified in seconds).
53 #define MAX_WINDOW_TIME_S (5 * 60)
56 * How many messages do we queue up at most for optional
57 * notifications to a client? (this can cause notifications
58 * about outgoing messages to be dropped).
60 #define MAX_NOTIFY_QUEUE 16
63 * Minimum bandwidth (out) to assign to any connected peer.
64 * Should be rather low; values larger than DEFAULT_BW_IN_OUT make no
67 #define MIN_BANDWIDTH_PER_PEER GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT
70 * After how much time past the "official" expiration time do
71 * we discard messages? Should not be zero since we may
72 * intentionally defer transmission until close to the deadline
73 * and then may be slightly past the deadline due to inaccuracy
74 * in sleep and our own CPU consumption.
76 #define PAST_EXPIRATION_DISCARD_TIME GNUNET_TIME_UNIT_SECONDS
79 * How long do we delay messages to get larger packet sizes (CORKing)?
81 #define MAX_CORK_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
84 * What is the maximum delay for a SET_KEY message?
86 #define MAX_SET_KEY_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
89 * What how long do we wait for SET_KEY confirmation initially?
91 #define INITIAL_SET_KEY_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 3)
94 * What is the maximum delay for a PING message?
96 #define MAX_PING_DELAY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 2)
99 * What is the maximum delay for a PONG message?
101 #define MAX_PONG_DELAY GNUNET_TIME_relative_multiply (MAX_PING_DELAY, 2)
104 * How often do we recalculate bandwidth quotas?
106 #define QUOTA_UPDATE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
109 * What is the priority for a SET_KEY message?
111 #define SET_KEY_PRIORITY 0xFFFFFF
114 * What is the priority for a PING message?
116 #define PING_PRIORITY 0xFFFFFF
119 * What is the priority for a PONG message?
121 #define PONG_PRIORITY 0xFFFFFF
124 * How many messages do we queue per peer at most? Must be at
127 #define MAX_PEER_QUEUE_SIZE 16
130 * How many non-mandatory messages do we queue per client at most?
132 #define MAX_CLIENT_QUEUE_SIZE 32
135 * What is the maximum age of a message for us to consider
136 * processing it? Note that this looks at the timestamp used
137 * by the other peer, so clock skew between machines does
138 * come into play here. So this should be picked high enough
139 * so that a little bit of clock skew does not prevent peers
140 * from connecting to us.
142 #define MAX_MESSAGE_AGE GNUNET_TIME_UNIT_DAYS
145 * What is the maximum size for encrypted messages? Note that this
146 * number imposes a clear limit on the maximum size of any message.
147 * Set to a value close to 64k but not so close that transports will
148 * have trouble with their headers.
150 #define MAX_ENCRYPTED_MESSAGE_SIZE (63 * 1024)
154 * State machine for our P2P encryption handshake. Everyone starts in
155 * "DOWN", if we receive the other peer's key (other peer initiated)
156 * we start in state RECEIVED (since we will immediately send our
157 * own); otherwise we start in SENT. If we get back a PONG from
158 * within either state, we move up to CONFIRMED (the PONG will always
159 * be sent back encrypted with the key we sent to the other peer).
161 enum PeerStateMachine
165 PEER_STATE_KEY_RECEIVED,
166 PEER_STATE_KEY_CONFIRMED
171 * Number of bytes (at the beginning) of "struct EncryptedMessage"
172 * that are NOT encrypted.
174 #define ENCRYPTED_HEADER_SIZE (sizeof(struct GNUNET_MessageHeader) + sizeof(uint32_t))
178 * Encapsulation for encrypted messages exchanged between
179 * peers. Followed by the actual encrypted data.
181 struct EncryptedMessage
184 * Message type is either CORE_ENCRYPTED_MESSAGE.
186 struct GNUNET_MessageHeader header;
189 * Random value used for IV generation. ENCRYPTED_HEADER_SIZE must
190 * be set to the offset of the *next* field.
192 uint32_t iv_seed GNUNET_PACKED;
195 * Hash of the plaintext (starting at 'sequence_number'), used to
196 * verify message integrity. Everything after this hash (including
197 * this hash itself) will be encrypted.
199 GNUNET_HashCode plaintext_hash;
202 * Sequence number, in network byte order. This field
203 * must be the first encrypted/decrypted field and the
204 * first byte that is hashed for the plaintext hash.
206 uint32_t sequence_number GNUNET_PACKED;
209 * Desired bandwidth (how much we should send to this peer / how
210 * much is the sender willing to receive)?
212 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
215 * Timestamp. Used to prevent reply of ancient messages
216 * (recent messages are caught with the sequence number).
218 struct GNUNET_TIME_AbsoluteNBO timestamp;
224 * We're sending an (encrypted) PING to the other peer to check if he
225 * can decrypt. The other peer should respond with a PONG with the
226 * same content, except this time encrypted with the receiver's key.
231 * Message type is CORE_PING.
233 struct GNUNET_MessageHeader header;
236 * Random number chosen to make reply harder.
238 uint32_t challenge GNUNET_PACKED;
241 * Intended target of the PING, used primarily to check
242 * that decryption actually worked.
244 struct GNUNET_PeerIdentity target;
250 * Response to a PING. Includes data from the original PING
251 * plus initial bandwidth quota information.
256 * Message type is CORE_PONG.
258 struct GNUNET_MessageHeader header;
261 * Random number proochosen to make reply harder. Must be
262 * first field after header (this is where we start to encrypt!).
264 uint32_t challenge GNUNET_PACKED;
269 uint32_t reserved GNUNET_PACKED;
272 * Desired bandwidth (how much we should send to this
273 * peer / how much is the sender willing to receive).
275 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
278 * Intended target of the PING, used primarily to check
279 * that decryption actually worked.
281 struct GNUNET_PeerIdentity target;
286 * Message transmitted to set (or update) a session key.
292 * Message type is either CORE_SET_KEY.
294 struct GNUNET_MessageHeader header;
297 * Status of the sender (should be in "enum PeerStateMachine"), nbo.
299 int32_t sender_status GNUNET_PACKED;
302 * Purpose of the signature, will be
303 * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
305 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
308 * At what time was this key created?
310 struct GNUNET_TIME_AbsoluteNBO creation_time;
313 * The encrypted session key.
315 struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
318 * Who is the intended recipient?
320 struct GNUNET_PeerIdentity target;
323 * Signature of the stuff above (starting at purpose).
325 struct GNUNET_CRYPTO_RsaSignature signature;
331 * Message waiting for transmission. This struct
332 * is followed by the actual content of the message.
338 * We keep messages in a doubly linked list.
340 struct MessageEntry *next;
343 * We keep messages in a doubly linked list.
345 struct MessageEntry *prev;
348 * By when are we supposed to transmit this message?
350 struct GNUNET_TIME_Absolute deadline;
353 * By when are we supposed to transmit this message (after
356 struct GNUNET_TIME_Absolute slack_deadline;
359 * How important is this message to us?
361 unsigned int priority;
364 * How long is the message? (number of bytes following
365 * the "struct MessageEntry", but not including the
366 * size of "struct MessageEntry" itself!)
371 * Was this message selected for transmission in the
372 * current round? GNUNET_YES or GNUNET_NO.
377 * Did we give this message some slack (delayed sending) previously
378 * (and hence should not give it any more slack)? GNUNET_YES or
389 * We keep neighbours in a linked list (for now).
391 struct Neighbour *next;
394 * Unencrypted messages destined for this peer.
396 struct MessageEntry *messages;
399 * Head of the batched, encrypted message queue (already ordered,
400 * transmit starting with the head).
402 struct MessageEntry *encrypted_head;
405 * Tail of the batched, encrypted message queue (already ordered,
406 * append new messages to tail)
408 struct MessageEntry *encrypted_tail;
411 * Handle for pending requests for transmission to this peer
412 * with the transport service. NULL if no request is pending.
414 struct GNUNET_TRANSPORT_TransmitHandle *th;
417 * Public key of the neighbour, NULL if we don't have it yet.
419 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
422 * We received a PING message before we got the "public_key"
423 * (or the SET_KEY). We keep it here until we have a key
424 * to decrypt it. NULL if no PING is pending.
426 struct PingMessage *pending_ping;
429 * We received a PONG message before we got the "public_key"
430 * (or the SET_KEY). We keep it here until we have a key
431 * to decrypt it. NULL if no PONG is pending.
433 struct PongMessage *pending_pong;
436 * Non-NULL if we are currently looking up HELLOs for this peer.
439 struct GNUNET_PEERINFO_IteratorContext *pitr;
442 * SetKeyMessage to transmit, NULL if we are not currently trying
445 struct SetKeyMessage *skm;
448 * Identity of the neighbour.
450 struct GNUNET_PeerIdentity peer;
453 * Key we use to encrypt our messages for the other peer
454 * (initialized by us when we do the handshake).
456 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
459 * Key we use to decrypt messages from the other peer
460 * (given to us by the other peer during the handshake).
462 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
465 * ID of task used for re-trying plaintext scheduling.
467 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
470 * ID of task used for re-trying SET_KEY and PING message.
472 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
475 * ID of task used for updating bandwidth quota for this neighbour.
477 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
480 * ID of task used for cleaning up dead neighbour entries.
482 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
485 * At what time did we generate our encryption key?
487 struct GNUNET_TIME_Absolute encrypt_key_created;
490 * At what time did the other peer generate the decryption key?
492 struct GNUNET_TIME_Absolute decrypt_key_created;
495 * At what time did we initially establish (as in, complete session
496 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
498 struct GNUNET_TIME_Absolute time_established;
501 * At what time did we last receive an encrypted message from the
502 * other peer? Should be zero if status != KEY_CONFIRMED.
504 struct GNUNET_TIME_Absolute last_activity;
507 * Last latency observed from this peer.
509 struct GNUNET_TIME_Relative last_latency;
512 * At what frequency are we currently re-trying SET_KEY messages?
514 struct GNUNET_TIME_Relative set_key_retry_frequency;
517 * Tracking bandwidth for sending to this peer.
519 struct GNUNET_BANDWIDTH_Tracker available_send_window;
522 * Tracking bandwidth for receiving from this peer.
524 struct GNUNET_BANDWIDTH_Tracker available_recv_window;
527 * How valueable were the messages of this peer recently?
529 unsigned long long current_preference;
532 * Bit map indicating which of the 32 sequence numbers before the last
533 * were received (good for accepting out-of-order packets and
534 * estimating reliability of the connection)
536 unsigned int last_packets_bitmap;
539 * last sequence number received on this connection (highest)
541 uint32_t last_sequence_number_received;
544 * last sequence number transmitted
546 uint32_t last_sequence_number_sent;
549 * Available bandwidth in for this peer (current target).
551 struct GNUNET_BANDWIDTH_Value32NBO bw_in;
554 * Available bandwidth out for this peer (current target).
556 struct GNUNET_BANDWIDTH_Value32NBO bw_out;
559 * Internal bandwidth limit set for this peer (initially typically
560 * set to "-1"). Actual "bw_out" is MIN of
561 * "bpm_out_internal_limit" and "bw_out_external_limit".
563 struct GNUNET_BANDWIDTH_Value32NBO bw_out_internal_limit;
566 * External bandwidth limit set for this peer by the
567 * peer that we are communicating with. "bw_out" is MIN of
568 * "bw_out_internal_limit" and "bw_out_external_limit".
570 struct GNUNET_BANDWIDTH_Value32NBO bw_out_external_limit;
573 * What was our PING challenge number (for this peer)?
575 uint32_t ping_challenge;
578 * What was the last distance to this peer as reported by the transports?
580 uint32_t last_distance;
583 * What is our connection status?
585 enum PeerStateMachine status;
588 * Are we currently connected to this neighbour?
596 * Data structure for each client connected to the core service.
601 * Clients are kept in a linked list.
606 * Handle for the client with the server API.
608 struct GNUNET_SERVER_Client *client_handle;
611 * Array of the types of messages this peer cares
612 * about (with "tcnt" entries). Allocated as part
613 * of this client struct, do not free!
615 const uint16_t *types;
618 * Options for messages this client cares about,
619 * see GNUNET_CORE_OPTION_ values.
624 * Number of types of incoming messages this client
625 * specifically cares about. Size of the "types" array.
635 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
640 static struct GNUNET_PeerIdentity my_identity;
645 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
650 struct GNUNET_SCHEDULER_Handle *sched;
655 const struct GNUNET_CONFIGURATION_Handle *cfg;
660 static struct GNUNET_SERVER_Handle *server;
665 static struct GNUNET_TRANSPORT_Handle *transport;
668 * Linked list of our clients.
670 static struct Client *clients;
673 * Context for notifications we need to send to our clients.
675 static struct GNUNET_SERVER_NotificationContext *notifier;
678 * We keep neighbours in a linked list (for now).
680 static struct Neighbour *neighbours;
683 * Sum of all preferences among all neighbours.
685 static unsigned long long preference_sum;
688 * Total number of neighbours we have.
690 static unsigned int neighbour_count;
693 * How much inbound bandwidth are we supposed to be using per second?
694 * FIXME: this value is not used!
696 static unsigned long long bandwidth_target_in_bps;
699 * How much outbound bandwidth are we supposed to be using per second?
701 static unsigned long long bandwidth_target_out_bps;
706 * A preference value for a neighbour was update. Update
707 * the preference sum accordingly.
709 * @param inc how much was a preference value increased?
712 update_preference_sum (unsigned long long inc)
715 unsigned long long os;
718 preference_sum += inc;
719 if (preference_sum >= os)
721 /* overflow! compensate by cutting all values in half! */
726 n->current_preference /= 2;
727 preference_sum += n->current_preference;
734 * Find the entry for the given neighbour.
736 * @param peer identity of the neighbour
737 * @return NULL if we are not connected, otherwise the
740 static struct Neighbour *
741 find_neighbour (const struct GNUNET_PeerIdentity *peer)
743 struct Neighbour *ret;
746 while ((ret != NULL) &&
747 (0 != memcmp (&ret->peer,
748 peer, sizeof (struct GNUNET_PeerIdentity))))
755 * Send a message to one of our clients.
757 * @param client target for the message
758 * @param msg message to transmit
759 * @param can_drop could this message be dropped if the
760 * client's queue is getting too large?
763 send_to_client (struct Client *client,
764 const struct GNUNET_MessageHeader *msg,
767 #if DEBUG_CORE_CLIENT
768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
769 "Preparing to send message of type %u to client.\n",
772 GNUNET_SERVER_notification_context_unicast (notifier,
773 client->client_handle,
780 * Send a message to all of our current clients that have
781 * the right options set.
783 * @param msg message to multicast
784 * @param can_drop can this message be discarded if the queue is too long
785 * @param options mask to use
788 send_to_all_clients (const struct GNUNET_MessageHeader *msg,
797 if (0 != (c->options & options))
798 send_to_client (c, msg, can_drop);
805 * Handle CORE_INIT request.
808 handle_client_init (void *cls,
809 struct GNUNET_SERVER_Client *client,
810 const struct GNUNET_MessageHeader *message)
812 const struct InitMessage *im;
813 struct InitReplyMessage irm;
816 const uint16_t *types;
819 struct ConnectNotifyMessage cnm;
822 #if DEBUG_CORE_CLIENT
823 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
824 "Client connecting to core service with `%s' message\n",
827 /* check that we don't have an entry already */
831 if (client == c->client_handle)
834 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
839 msize = ntohs (message->size);
840 if (msize < sizeof (struct InitMessage))
843 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
846 GNUNET_SERVER_notification_context_add (notifier, client);
847 im = (const struct InitMessage *) message;
848 types = (const uint16_t *) &im[1];
849 msize -= sizeof (struct InitMessage);
850 c = GNUNET_malloc (sizeof (struct Client) + msize);
851 c->client_handle = client;
854 c->tcnt = msize / sizeof (uint16_t);
855 c->types = (const uint16_t *) &c[1];
856 wtypes = (uint16_t *) &c[1];
857 for (i=0;i<c->tcnt;i++)
858 wtypes[i] = ntohs (types[i]);
859 c->options = ntohl (im->options);
860 #if DEBUG_CORE_CLIENT
861 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
862 "Client %p is interested in %u message types\n",
866 /* send init reply message */
867 irm.header.size = htons (sizeof (struct InitReplyMessage));
868 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
869 irm.reserved = htonl (0);
870 memcpy (&irm.publicKey,
872 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
873 #if DEBUG_CORE_CLIENT
874 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
875 "Sending `%s' message to client.\n", "INIT_REPLY");
877 send_to_client (c, &irm.header, GNUNET_NO);
878 /* notify new client about existing neighbours */
879 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
880 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
884 if (n->status == PEER_STATE_KEY_CONFIRMED)
886 #if DEBUG_CORE_CLIENT
887 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
888 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
890 cnm.distance = htonl (n->last_distance);
891 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
893 send_to_client (c, &cnm.header, GNUNET_NO);
897 GNUNET_SERVER_receive_done (client, GNUNET_OK);
902 * A client disconnected, clean up.
905 * @param client identification of the client
908 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
915 #if DEBUG_CORE_CLIENT
916 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
917 "Client %p has disconnected from core service.\n",
924 if (client == pos->client_handle)
929 prev->next = pos->next;
936 /* client never sent INIT */
941 * Handle REQUEST_INFO request.
944 handle_client_request_info (void *cls,
945 struct GNUNET_SERVER_Client *client,
946 const struct GNUNET_MessageHeader *message)
948 const struct RequestInfoMessage *rcm;
950 struct ConfigurationInfoMessage cim;
953 unsigned long long old_preference;
954 struct GNUNET_SERVER_TransmitContext *tc;
956 #if DEBUG_CORE_CLIENT
957 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
958 "Core service receives `%s' request.\n", "REQUEST_INFO");
960 rcm = (const struct RequestInfoMessage *) message;
961 n = find_neighbour (&rcm->peer);
962 memset (&cim, 0, sizeof (cim));
965 want_reserv = ntohl (rcm->reserve_inbound);
966 if (n->bw_out_internal_limit.value__ != rcm->limit_outbound.value__)
968 n->bw_out_internal_limit = rcm->limit_outbound;
969 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
970 n->bw_out_external_limit);
971 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
973 GNUNET_TRANSPORT_set_quota (transport,
977 GNUNET_TIME_UNIT_FOREVER_REL,
982 got_reserv = want_reserv;
984 else if (want_reserv > 0)
986 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
987 want_reserv).value == 0)
988 got_reserv = want_reserv;
990 got_reserv = 0; /* all or nothing */
994 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
996 old_preference = n->current_preference;
997 n->current_preference += GNUNET_ntohll(rcm->preference_change);
998 if (old_preference > n->current_preference)
1000 /* overflow; cap at maximum value */
1001 n->current_preference = (unsigned long long) -1;
1003 update_preference_sum (n->current_preference - old_preference);
1004 #if DEBUG_CORE_QUOTA
1005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1006 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
1008 GNUNET_i2s (&rcm->peer),
1011 cim.reserved_amount = htonl (got_reserv);
1012 cim.bw_in = n->bw_in;
1013 cim.bw_out = n->bw_out;
1014 cim.preference = n->current_preference;
1016 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1017 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1018 cim.peer = rcm->peer;
1020 #if DEBUG_CORE_CLIENT
1021 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1022 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1024 tc = GNUNET_SERVER_transmit_context_create (client);
1025 GNUNET_SERVER_transmit_context_append_message (tc, &cim.header);
1026 GNUNET_SERVER_transmit_context_run (tc,
1027 GNUNET_TIME_UNIT_FOREVER_REL);
1032 * Free the given entry for the neighbour (it has
1033 * already been removed from the list at this point).
1035 * @param n neighbour to free
1038 free_neighbour (struct Neighbour *n)
1040 struct MessageEntry *m;
1042 if (n->pitr != NULL)
1044 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1049 GNUNET_free (n->skm);
1052 while (NULL != (m = n->messages))
1054 n->messages = m->next;
1057 while (NULL != (m = n->encrypted_head))
1059 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1066 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1069 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1070 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1071 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1072 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
1073 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1074 GNUNET_SCHEDULER_cancel (sched, n->quota_update_task);
1075 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1076 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1077 GNUNET_free_non_null (n->public_key);
1078 GNUNET_free_non_null (n->pending_ping);
1079 GNUNET_free_non_null (n->pending_pong);
1085 * Consider freeing the given neighbour since we may not need
1086 * to keep it around anymore.
1088 * @param n neighbour to consider discarding
1091 consider_free_neighbour (struct Neighbour *n);
1095 * Task triggered when a neighbour entry might have gotten stale.
1097 * @param cls the 'struct Neighbour'
1098 * @param tc scheduler context (not used)
1101 consider_free_task (void *cls,
1102 const struct GNUNET_SCHEDULER_TaskContext *tc)
1104 struct Neighbour *n = cls;
1105 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1106 consider_free_neighbour (n);
1111 * Consider freeing the given neighbour since we may not need
1112 * to keep it around anymore.
1114 * @param n neighbour to consider discarding
1117 consider_free_neighbour (struct Neighbour *n)
1119 struct Neighbour *pos;
1120 struct Neighbour *prev;
1121 struct GNUNET_TIME_Relative left;
1123 if ( (n->th != NULL) ||
1124 (n->pitr != NULL) ||
1125 (n->status == PEER_STATE_KEY_CONFIRMED) ||
1126 (GNUNET_YES == n->is_connected) )
1127 return; /* no chance */
1129 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1133 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1134 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1135 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
1137 &consider_free_task,
1141 /* actually free the neighbour... */
1150 neighbours = n->next;
1152 prev->next = n->next;
1153 GNUNET_assert (neighbour_count > 0);
1160 * Check if we have encrypted messages for the specified neighbour
1161 * pending, and if so, check with the transport about sending them
1164 * @param n neighbour to check.
1166 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1170 * Function called when the transport service is ready to
1171 * receive an encrypted message for the respective peer
1173 * @param cls neighbour to use message from
1174 * @param size number of bytes we can transmit
1175 * @param buf where to copy the message
1176 * @return number of bytes transmitted
1179 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1181 struct Neighbour *n = cls;
1182 struct MessageEntry *m;
1187 GNUNET_assert (NULL != (m = n->encrypted_head));
1188 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1195 GNUNET_assert (size >= m->size);
1196 memcpy (cbuf, &m[1], m->size);
1198 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1201 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1202 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1203 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1204 ret, GNUNET_i2s (&n->peer));
1206 process_encrypted_neighbour_queue (n);
1211 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1212 "Transmission of message of type %u and size %u failed\n",
1213 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1218 consider_free_neighbour (n);
1224 * Check if we have plaintext messages for the specified neighbour
1225 * pending, and if so, consider batching and encrypting them (and
1226 * then trigger processing of the encrypted queue if needed).
1228 * @param n neighbour to check.
1230 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1234 * Check if we have encrypted messages for the specified neighbour
1235 * pending, and if so, check with the transport about sending them
1238 * @param n neighbour to check.
1241 process_encrypted_neighbour_queue (struct Neighbour *n)
1243 struct MessageEntry *m;
1246 return; /* request already pending */
1247 m = n->encrypted_head;
1250 /* encrypted queue empty, try plaintext instead */
1251 process_plaintext_neighbour_queue (n);
1255 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1256 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1258 GNUNET_i2s (&n->peer),
1259 GNUNET_TIME_absolute_get_remaining (m->deadline).
1263 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1266 GNUNET_TIME_absolute_get_remaining
1268 ¬ify_encrypted_transmit_ready,
1272 /* message request too large or duplicate request */
1274 /* discard encrypted message */
1275 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1279 process_encrypted_neighbour_queue (n);
1285 * Decrypt size bytes from in and write the result to out. Use the
1286 * key for inbound traffic of the given neighbour. This function does
1287 * NOT do any integrity-checks on the result.
1289 * @param n neighbour we are receiving from
1290 * @param iv initialization vector to use
1291 * @param in ciphertext
1292 * @param out plaintext
1293 * @param size size of in/out
1294 * @return GNUNET_OK on success
1297 do_decrypt (struct Neighbour *n,
1298 const GNUNET_HashCode * iv,
1299 const void *in, void *out, size_t size)
1301 if (size != (uint16_t) size)
1306 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1307 (n->status != PEER_STATE_KEY_CONFIRMED))
1309 GNUNET_break_op (0);
1310 return GNUNET_SYSERR;
1313 GNUNET_CRYPTO_aes_decrypt (in,
1317 GNUNET_CRYPTO_AesInitializationVector *) iv,
1321 return GNUNET_SYSERR;
1324 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1325 "Decrypted %u bytes from `%4s' using key %u\n",
1326 size, GNUNET_i2s (&n->peer), n->decrypt_key.crc32);
1333 * Encrypt size bytes from in and write the result to out. Use the
1334 * key for outbound traffic of the given neighbour.
1336 * @param n neighbour we are sending to
1337 * @param iv initialization vector to use
1338 * @param in ciphertext
1339 * @param out plaintext
1340 * @param size size of in/out
1341 * @return GNUNET_OK on success
1344 do_encrypt (struct Neighbour *n,
1345 const GNUNET_HashCode * iv,
1346 const void *in, void *out, size_t size)
1348 if (size != (uint16_t) size)
1353 GNUNET_assert (size ==
1354 GNUNET_CRYPTO_aes_encrypt (in,
1358 GNUNET_CRYPTO_AesInitializationVector
1361 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1362 "Encrypted %u bytes for `%4s' using key %u\n", size,
1363 GNUNET_i2s (&n->peer), n->encrypt_key.crc32);
1370 * Select messages for transmission. This heuristic uses a combination
1371 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1372 * and priority-based discard (in case no feasible schedule exist) and
1373 * speculative optimization (defer any kind of transmission until
1374 * we either create a batch of significant size, 25% of max, or until
1375 * we are close to a deadline). Furthermore, when scheduling the
1376 * heuristic also packs as many messages into the batch as possible,
1377 * starting with those with the earliest deadline. Yes, this is fun.
1379 * @param n neighbour to select messages from
1380 * @param size number of bytes to select for transmission
1381 * @param retry_time set to the time when we should try again
1382 * (only valid if this function returns zero)
1383 * @return number of bytes selected, or 0 if we decided to
1384 * defer scheduling overall; in that case, retry_time is set.
1387 select_messages (struct Neighbour *n,
1388 size_t size, struct GNUNET_TIME_Relative *retry_time)
1390 struct MessageEntry *pos;
1391 struct MessageEntry *min;
1392 struct MessageEntry *last;
1393 unsigned int min_prio;
1394 struct GNUNET_TIME_Absolute t;
1395 struct GNUNET_TIME_Absolute now;
1396 struct GNUNET_TIME_Relative delta;
1398 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
1401 unsigned int queue_size;
1402 int discard_low_prio;
1404 GNUNET_assert (NULL != n->messages);
1405 now = GNUNET_TIME_absolute_get ();
1406 /* last entry in linked list of messages processed */
1408 /* should we remove the entry with the lowest
1409 priority from consideration for scheduling at the
1420 discard_low_prio = GNUNET_YES;
1421 while (GNUNET_YES == discard_low_prio)
1425 discard_low_prio = GNUNET_NO;
1426 /* calculate number of bytes available for transmission at time "t" */
1427 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
1429 /* how many bytes have we (hypothetically) scheduled so far */
1431 /* maximum time we can wait before transmitting anything
1432 and still make all of our deadlines */
1433 slack = MAX_CORK_DELAY;
1435 /* note that we use "*2" here because we want to look
1436 a bit further into the future; much more makes no
1437 sense since new message might be scheduled in the
1439 while ((pos != NULL) && (off < size * 2))
1441 if (pos->do_transmit == GNUNET_YES)
1443 /* already removed from consideration */
1447 if (discard_low_prio == GNUNET_NO)
1449 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
1450 if (delta.value > 0)
1452 // FIXME: HUH? Check!
1454 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
1457 if (avail < pos->size)
1459 // FIXME: HUH? Check!
1460 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1465 /* update slack, considering both its absolute deadline
1466 and relative deadlines caused by other messages
1467 with their respective load */
1468 slack = GNUNET_TIME_relative_min (slack,
1469 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
1471 if (pos->deadline.value <= now.value)
1474 slack = GNUNET_TIME_UNIT_ZERO;
1476 else if (GNUNET_YES == pos->got_slack)
1478 /* should be soon now! */
1479 slack = GNUNET_TIME_relative_min (slack,
1480 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
1485 GNUNET_TIME_relative_min (slack,
1486 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
1487 pos->got_slack = GNUNET_YES;
1488 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
1489 GNUNET_TIME_relative_to_absolute (MAX_CORK_DELAY));
1494 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
1495 if (pos->priority <= min_prio)
1497 /* update min for discard */
1498 min_prio = pos->priority;
1503 if (discard_low_prio)
1505 GNUNET_assert (min != NULL);
1506 /* remove lowest-priority entry from consideration */
1507 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1511 /* guard against sending "tiny" messages with large headers without
1513 if ( (slack.value > 0) &&
1515 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
1517 /* less than 25% of message would be filled with deadlines still
1518 being met if we delay by one second or more; so just wait for
1519 more data; but do not wait longer than 1s (since we don't want
1520 to delay messages for a really long time either). */
1521 *retry_time = MAX_CORK_DELAY;
1522 /* reset do_transmit values for next time */
1525 pos->do_transmit = GNUNET_NO;
1529 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1530 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
1531 (unsigned long long) slack.value,
1533 (unsigned int) size);
1537 /* select marked messages (up to size) for transmission */
1542 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
1544 pos->do_transmit = GNUNET_YES; /* mark for transmission */
1549 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
1553 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1554 "Selected %u/%u bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
1556 queue_size, MAX_PEER_QUEUE_SIZE,
1557 GNUNET_i2s (&n->peer));
1564 * Batch multiple messages into a larger buffer.
1566 * @param n neighbour to take messages from
1567 * @param buf target buffer
1568 * @param size size of buf
1569 * @param deadline set to transmission deadline for the result
1570 * @param retry_time set to the time when we should try again
1571 * (only valid if this function returns zero)
1572 * @param priority set to the priority of the batch
1573 * @return number of bytes written to buf (can be zero)
1576 batch_message (struct Neighbour *n,
1579 struct GNUNET_TIME_Absolute *deadline,
1580 struct GNUNET_TIME_Relative *retry_time,
1581 unsigned int *priority)
1583 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE];
1584 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
1585 struct MessageEntry *pos;
1586 struct MessageEntry *prev;
1587 struct MessageEntry *next;
1592 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1593 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
1594 if (0 == select_messages (n, size, retry_time))
1597 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1598 "No messages selected, will try again in %llu ms\n",
1603 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
1604 ntm->distance = htonl (n->last_distance);
1605 ntm->latency = GNUNET_TIME_relative_hton (n->last_latency);
1606 ntm->peer = n->peer;
1610 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
1613 if (GNUNET_YES == pos->do_transmit)
1615 GNUNET_assert (pos->size <= size);
1616 /* do notifications */
1617 /* FIXME: track if we have *any* client that wants
1618 full notifications and only do this if that is
1620 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
1622 memcpy (&ntm[1], &pos[1], pos->size);
1623 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1624 sizeof (struct GNUNET_MessageHeader));
1625 send_to_all_clients (&ntm->header,
1627 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
1631 /* message too large for 'full' notifications, we do at
1632 least the 'hdr' type */
1635 sizeof (struct GNUNET_MessageHeader));
1637 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1639 send_to_all_clients (&ntm->header,
1641 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
1644 "Encrypting message of type %u\n",
1645 ntohs(((struct GNUNET_MessageHeader*)&pos[1])->type));
1647 /* copy for encrypted transmission */
1648 memcpy (&buf[ret], &pos[1], pos->size);
1651 *priority += pos->priority;
1653 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1654 "Adding plaintext message of size %u with deadline %llu ms to batch\n",
1656 GNUNET_TIME_absolute_get_remaining (pos->deadline).value);
1658 deadline->value = GNUNET_MIN (deadline->value, pos->deadline.value);
1672 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1673 "Deadline for message batch is %llu ms\n",
1674 GNUNET_TIME_absolute_get_remaining (*deadline).value);
1681 * Remove messages with deadlines that have long expired from
1684 * @param n neighbour to inspect
1687 discard_expired_messages (struct Neighbour *n)
1689 struct MessageEntry *prev;
1690 struct MessageEntry *next;
1691 struct MessageEntry *pos;
1692 struct GNUNET_TIME_Absolute now;
1693 struct GNUNET_TIME_Relative delta;
1695 now = GNUNET_TIME_absolute_get ();
1701 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
1702 if (delta.value > PAST_EXPIRATION_DISCARD_TIME.value)
1705 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1706 "Message is %llu ms past due, discarding.\n",
1723 * Signature of the main function of a task.
1725 * @param cls closure
1726 * @param tc context information (why was this task triggered now)
1729 retry_plaintext_processing (void *cls,
1730 const struct GNUNET_SCHEDULER_TaskContext *tc)
1732 struct Neighbour *n = cls;
1734 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1735 process_plaintext_neighbour_queue (n);
1740 * Send our key (and encrypted PING) to the other peer.
1742 * @param n the other peer
1744 static void send_key (struct Neighbour *n);
1747 * Task that will retry "send_key" if our previous attempt failed
1751 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1753 struct Neighbour *n = cls;
1756 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1757 "Retrying key transmission to `%4s'\n",
1758 GNUNET_i2s (&n->peer));
1760 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
1761 n->set_key_retry_frequency =
1762 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
1768 * Check if we have plaintext messages for the specified neighbour
1769 * pending, and if so, consider batching and encrypting them (and
1770 * then trigger processing of the encrypted queue if needed).
1772 * @param n neighbour to check.
1775 process_plaintext_neighbour_queue (struct Neighbour *n)
1777 char pbuf[MAX_ENCRYPTED_MESSAGE_SIZE]; /* plaintext */
1780 struct EncryptedMessage *em; /* encrypted message */
1781 struct EncryptedMessage *ph; /* plaintext header */
1782 struct MessageEntry *me;
1783 unsigned int priority;
1784 struct GNUNET_TIME_Absolute deadline;
1785 struct GNUNET_TIME_Relative retry_time;
1788 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1790 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1791 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1795 case PEER_STATE_DOWN:
1798 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1799 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1800 GNUNET_i2s(&n->peer));
1803 case PEER_STATE_KEY_SENT:
1804 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1805 n->retry_set_key_task
1806 = GNUNET_SCHEDULER_add_delayed (sched,
1807 n->set_key_retry_frequency,
1808 &set_key_retry_task, n);
1810 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1811 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1812 GNUNET_i2s(&n->peer));
1815 case PEER_STATE_KEY_RECEIVED:
1816 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1817 n->retry_set_key_task
1818 = GNUNET_SCHEDULER_add_delayed (sched,
1819 n->set_key_retry_frequency,
1820 &set_key_retry_task, n);
1822 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1823 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1824 GNUNET_i2s(&n->peer));
1827 case PEER_STATE_KEY_CONFIRMED:
1828 /* ready to continue */
1831 discard_expired_messages (n);
1832 if (n->messages == NULL)
1835 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1836 "Plaintext message queue for `%4s' is empty.\n",
1837 GNUNET_i2s(&n->peer));
1839 return; /* no pending messages */
1841 if (n->encrypted_head != NULL)
1844 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1845 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
1846 GNUNET_i2s(&n->peer));
1848 return; /* wait for messages already encrypted to be
1851 ph = (struct EncryptedMessage *) pbuf;
1852 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1854 used = sizeof (struct EncryptedMessage);
1855 used += batch_message (n,
1857 MAX_ENCRYPTED_MESSAGE_SIZE - used,
1858 &deadline, &retry_time, &priority);
1859 if (used == sizeof (struct EncryptedMessage))
1862 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1863 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
1864 GNUNET_i2s(&n->peer));
1866 /* no messages selected for sending, try again later... */
1867 n->retry_plaintext_task =
1868 GNUNET_SCHEDULER_add_delayed (sched,
1870 &retry_plaintext_processing, n);
1873 #if DEBUG_CORE_QUOTA
1874 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1875 "Sending %u b/s as new limit to peer `%4s'\n",
1876 (unsigned int) ntohl (n->bw_in.value__),
1877 GNUNET_i2s (&n->peer));
1879 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, -1));
1880 ph->sequence_number = htonl (++n->last_sequence_number_sent);
1881 ph->inbound_bw_limit = n->bw_in;
1882 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1884 /* setup encryption message header */
1885 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
1886 me->deadline = deadline;
1887 me->priority = priority;
1889 em = (struct EncryptedMessage *) &me[1];
1890 em->header.size = htons (used);
1891 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
1892 em->iv_seed = ph->iv_seed;
1893 esize = used - ENCRYPTED_HEADER_SIZE;
1894 GNUNET_CRYPTO_hash (&ph->sequence_number,
1895 esize - sizeof (GNUNET_HashCode),
1896 &ph->plaintext_hash);
1897 GNUNET_CRYPTO_hash (&ph->iv_seed, sizeof (uint32_t), &iv);
1900 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1901 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
1903 GNUNET_i2s(&n->peer),
1904 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).value);
1906 GNUNET_assert (GNUNET_OK ==
1909 &ph->plaintext_hash,
1910 &em->plaintext_hash, esize));
1911 /* append to transmission list */
1912 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1916 process_encrypted_neighbour_queue (n);
1921 * Function that recalculates the bandwidth quota for the
1922 * given neighbour and transmits it to the transport service.
1924 * @param cls neighbour for the quota update
1928 neighbour_quota_update (void *cls,
1929 const struct GNUNET_SCHEDULER_TaskContext *tc);
1933 * Schedule the task that will recalculate the bandwidth
1934 * quota for this peer (and possibly force a disconnect of
1935 * idle peers by calculating a bandwidth of zero).
1938 schedule_quota_update (struct Neighbour *n)
1940 GNUNET_assert (n->quota_update_task ==
1941 GNUNET_SCHEDULER_NO_TASK);
1942 n->quota_update_task
1943 = GNUNET_SCHEDULER_add_delayed (sched,
1944 QUOTA_UPDATE_FREQUENCY,
1945 &neighbour_quota_update,
1951 * Initialize a new 'struct Neighbour'.
1953 * @param pid ID of the new neighbour
1954 * @return handle for the new neighbour
1956 static struct Neighbour *
1957 create_neighbour (const struct GNUNET_PeerIdentity *pid)
1959 struct Neighbour *n;
1960 struct GNUNET_TIME_Absolute now;
1962 n = GNUNET_malloc (sizeof (struct Neighbour));
1963 n->next = neighbours;
1967 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
1968 now = GNUNET_TIME_absolute_get ();
1969 n->encrypt_key_created = now;
1970 n->last_activity = now;
1971 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
1972 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
1973 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
1974 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init ((uint32_t) - 1);
1975 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
1976 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1978 neighbour_quota_update (n, NULL);
1984 * Handle CORE_SEND request.
1987 * @param client the client issuing the request
1988 * @param message the "struct SendMessage"
1991 handle_client_send (void *cls,
1992 struct GNUNET_SERVER_Client *client,
1993 const struct GNUNET_MessageHeader *message)
1995 const struct SendMessage *sm;
1996 struct Neighbour *n;
1997 struct MessageEntry *prev;
1998 struct MessageEntry *pos;
1999 struct MessageEntry *e;
2000 struct MessageEntry *min_prio_entry;
2001 struct MessageEntry *min_prio_prev;
2002 unsigned int min_prio;
2003 unsigned int queue_size;
2006 msize = ntohs (message->size);
2008 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
2012 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2015 sm = (const struct SendMessage *) message;
2016 msize -= sizeof (struct SendMessage);
2017 n = find_neighbour (&sm->peer);
2019 n = create_neighbour (&sm->peer);
2021 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2022 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2025 GNUNET_i2s (&sm->peer));
2027 /* bound queue size */
2028 discard_expired_messages (n);
2029 min_prio = (unsigned int) -1;
2030 min_prio_entry = NULL;
2031 min_prio_prev = NULL;
2037 if (pos->priority < min_prio)
2039 min_prio_entry = pos;
2040 min_prio_prev = prev;
2041 min_prio = pos->priority;
2047 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2050 if (ntohl(sm->priority) <= min_prio)
2052 /* discard new entry */
2054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2055 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2057 MAX_PEER_QUEUE_SIZE,
2059 ntohs (message->type));
2062 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2065 /* discard "min_prio_entry" */
2067 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2068 "Queue full, discarding existing older request\n");
2070 if (min_prio_prev == NULL)
2071 n->messages = min_prio_entry->next;
2073 min_prio_prev->next = min_prio_entry->next;
2074 GNUNET_free (min_prio_entry);
2078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2079 "Adding transmission request for `%4s' of size %u to queue\n",
2080 GNUNET_i2s (&sm->peer),
2083 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2084 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2085 e->priority = ntohl (sm->priority);
2087 memcpy (&e[1], &sm[1], msize);
2089 /* insert, keep list sorted by deadline */
2092 while ((pos != NULL) && (pos->deadline.value < e->deadline.value))
2103 /* consider scheduling now */
2104 process_plaintext_neighbour_queue (n);
2106 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2111 * Function called when the transport service is ready to
2112 * receive a message. Only resets 'n->th' to NULL.
2114 * @param cls neighbour to use message from
2115 * @param size number of bytes we can transmit
2116 * @param buf where to copy the message
2117 * @return number of bytes transmitted
2120 notify_transport_connect_done (void *cls, size_t size, void *buf)
2122 struct Neighbour *n = cls;
2127 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2128 _("Failed to connect to `%4s': transport failed to connect\n"),
2129 GNUNET_i2s (&n->peer));
2138 * Handle CORE_REQUEST_CONNECT request.
2141 * @param client the client issuing the request
2142 * @param message the "struct ConnectMessage"
2145 handle_client_request_connect (void *cls,
2146 struct GNUNET_SERVER_Client *client,
2147 const struct GNUNET_MessageHeader *message)
2149 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2150 struct Neighbour *n;
2151 struct GNUNET_TIME_Relative timeout;
2153 if (0 == memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2156 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2159 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2160 n = find_neighbour (&cm->peer);
2162 n = create_neighbour (&cm->peer);
2163 if ( (n->is_connected) ||
2165 return; /* already connected, or at least trying */
2167 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2168 "Core received `%s' request for `%4s', will try to establish connection\n",
2170 GNUNET_i2s (&cm->peer));
2172 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2173 /* ask transport to connect to the peer */
2174 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2176 sizeof (struct GNUNET_MessageHeader), 0,
2178 ¬ify_transport_connect_done,
2180 GNUNET_break (NULL != n->th);
2185 * List of handlers for the messages understood by this
2188 static struct GNUNET_SERVER_MessageHandler handlers[] = {
2189 {&handle_client_init, NULL,
2190 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
2191 {&handle_client_request_info, NULL,
2192 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
2193 sizeof (struct RequestInfoMessage)},
2194 {&handle_client_send, NULL,
2195 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
2196 {&handle_client_request_connect, NULL,
2197 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
2198 sizeof (struct ConnectMessage)},
2204 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2205 * the neighbour's struct and retry send_key. Or, if we did not get a
2206 * HELLO, just do nothing.
2208 * @param cls the 'struct Neighbour' to retry sending the key for
2209 * @param peer the peer for which this is the HELLO
2210 * @param hello HELLO message of that peer
2211 * @param trust amount of trust we currently have in that peer
2214 process_hello_retry_send_key (void *cls,
2215 const struct GNUNET_PeerIdentity *peer,
2216 const struct GNUNET_HELLO_Message *hello,
2219 struct Neighbour *n = cls;
2224 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2225 "Entered `process_hello_retry_send_key' and `peer' is NULL!\n");
2228 if (n->public_key != NULL)
2234 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2235 n->retry_set_key_task
2236 = GNUNET_SCHEDULER_add_delayed (sched,
2237 n->set_key_retry_frequency,
2238 &set_key_retry_task, n);
2244 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2245 "Entered `process_hello_retry_send_key' for peer `%4s'\n",
2248 if (n->public_key != NULL)
2251 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2252 "already have public key for peer %s!! (so why are we here?)\n",
2259 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2260 "Received new `%s' message for `%4s', initiating key exchange.\n",
2265 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2266 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2268 GNUNET_free (n->public_key);
2269 n->public_key = NULL;
2271 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2272 "GNUNET_HELLO_get_key returned awfully\n");
2280 * Send our key (and encrypted PING) to the other peer.
2282 * @param n the other peer
2285 send_key (struct Neighbour *n)
2287 struct SetKeyMessage *sm;
2288 struct MessageEntry *me;
2289 struct PingMessage pp;
2290 struct PingMessage *pm;
2292 if ( (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK) ||
2296 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2297 "Key exchange in progress with `%4s'.\n",
2298 GNUNET_i2s (&n->peer));
2300 return; /* already in progress */
2304 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2305 "Asked to perform key exchange with `%4s'.\n",
2306 GNUNET_i2s (&n->peer));
2308 if (n->public_key == NULL)
2310 /* lookup n's public key, then try again */
2312 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2313 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2314 GNUNET_i2s (&n->peer));
2316 GNUNET_assert (n->pitr == NULL);
2317 n->pitr = GNUNET_PEERINFO_iterate (cfg,
2321 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2322 &process_hello_retry_send_key, n);
2325 /* first, set key message */
2326 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2327 sizeof (struct SetKeyMessage));
2328 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
2329 me->priority = SET_KEY_PRIORITY;
2330 me->size = sizeof (struct SetKeyMessage);
2331 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2335 sm = (struct SetKeyMessage *) &me[1];
2336 sm->header.size = htons (sizeof (struct SetKeyMessage));
2337 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
2338 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
2339 PEER_STATE_KEY_SENT : n->status));
2341 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2342 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2343 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2344 sizeof (struct GNUNET_PeerIdentity));
2345 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
2346 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
2347 sm->target = n->peer;
2348 GNUNET_assert (GNUNET_OK ==
2349 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
2351 GNUNET_CRYPTO_AesSessionKey),
2353 &sm->encrypted_key));
2354 GNUNET_assert (GNUNET_OK ==
2355 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
2358 /* second, encrypted PING message */
2359 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2360 sizeof (struct PingMessage));
2361 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
2362 me->priority = PING_PRIORITY;
2363 me->size = sizeof (struct PingMessage);
2364 n->encrypted_tail->next = me;
2365 n->encrypted_tail = me;
2366 pm = (struct PingMessage *) &me[1];
2367 pm->header.size = htons (sizeof (struct PingMessage));
2368 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
2369 pp.challenge = htonl (n->ping_challenge);
2370 pp.target = n->peer;
2372 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2373 "Encrypting `%s' and `%s' messages for `%4s'.\n",
2374 "SET_KEY", "PING", GNUNET_i2s (&n->peer));
2375 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2376 "Sending `%s' to `%4s' with challenge %u encrypted using key %u\n",
2378 GNUNET_i2s (&n->peer), n->ping_challenge, n->encrypt_key.crc32);
2381 &n->peer.hashPubKey,
2384 sizeof (struct PingMessage) -
2385 sizeof (struct GNUNET_MessageHeader));
2389 case PEER_STATE_DOWN:
2390 n->status = PEER_STATE_KEY_SENT;
2392 case PEER_STATE_KEY_SENT:
2394 case PEER_STATE_KEY_RECEIVED:
2396 case PEER_STATE_KEY_CONFIRMED:
2403 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2404 "Have %llu ms left for `%s' transmission.\n",
2405 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).value,
2408 /* trigger queue processing */
2409 process_encrypted_neighbour_queue (n);
2410 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
2411 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
2412 n->retry_set_key_task
2413 = GNUNET_SCHEDULER_add_delayed (sched,
2414 n->set_key_retry_frequency,
2415 &set_key_retry_task, n);
2420 * We received a SET_KEY message. Validate and update
2421 * our key material and status.
2423 * @param n the neighbour from which we received message m
2424 * @param m the set key message we received
2427 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m);
2431 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2432 * the neighbour's struct and retry handling the set_key message. Or,
2433 * if we did not get a HELLO, just free the set key message.
2435 * @param cls pointer to the set key message
2436 * @param peer the peer for which this is the HELLO
2437 * @param hello HELLO message of that peer
2438 * @param trust amount of trust we currently have in that peer
2441 process_hello_retry_handle_set_key (void *cls,
2442 const struct GNUNET_PeerIdentity *peer,
2443 const struct GNUNET_HELLO_Message *hello,
2446 struct Neighbour *n = cls;
2447 struct SetKeyMessage *sm = n->skm;
2456 if (n->public_key != NULL)
2457 return; /* multiple HELLOs match!? */
2459 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2460 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2462 GNUNET_break_op (0);
2463 GNUNET_free (n->public_key);
2464 n->public_key = NULL;
2468 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2469 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
2470 "HELLO", GNUNET_i2s (peer), "SET_KEY");
2472 handle_set_key (n, sm);
2477 * We received a PING message. Validate and transmit
2480 * @param n sender of the PING
2481 * @param m the encrypted PING message itself
2484 handle_ping (struct Neighbour *n, const struct PingMessage *m)
2486 struct PingMessage t;
2487 struct PongMessage tx;
2488 struct PongMessage *tp;
2489 struct MessageEntry *me;
2492 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2493 "Core service receives `%s' request from `%4s'.\n",
2494 "PING", GNUNET_i2s (&n->peer));
2498 &my_identity.hashPubKey,
2501 sizeof (struct PingMessage) -
2502 sizeof (struct GNUNET_MessageHeader)))
2505 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2506 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u\n",
2508 GNUNET_i2s (&t.target),
2509 ntohl (t.challenge), n->decrypt_key.crc32);
2510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2511 "Target of `%s' request is `%4s'.\n",
2512 "PING", GNUNET_i2s (&t.target));
2514 if (0 != memcmp (&t.target,
2515 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2517 GNUNET_break_op (0);
2520 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2521 sizeof (struct PongMessage));
2522 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2526 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
2527 me->priority = PONG_PRIORITY;
2528 me->size = sizeof (struct PongMessage);
2529 tx.reserved = htonl (0);
2530 tx.inbound_bw_limit = n->bw_in;
2531 tx.challenge = t.challenge;
2532 tx.target = t.target;
2533 tp = (struct PongMessage *) &me[1];
2534 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
2535 tp->header.size = htons (sizeof (struct PongMessage));
2537 &my_identity.hashPubKey,
2540 sizeof (struct PongMessage) -
2541 sizeof (struct GNUNET_MessageHeader));
2543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2544 "Encrypting `%s' with challenge %u using key %u\n", "PONG",
2545 ntohl (t.challenge), n->encrypt_key.crc32);
2547 /* trigger queue processing */
2548 process_encrypted_neighbour_queue (n);
2553 * We received a PONG message. Validate and update our status.
2555 * @param n sender of the PONG
2556 * @param m the encrypted PONG message itself
2559 handle_pong (struct Neighbour *n,
2560 const struct PongMessage *m)
2562 struct PongMessage t;
2563 struct ConnectNotifyMessage cnm;
2566 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2567 "Core service receives `%s' request from `%4s'.\n",
2568 "PONG", GNUNET_i2s (&n->peer));
2572 &n->peer.hashPubKey,
2575 sizeof (struct PongMessage) -
2576 sizeof (struct GNUNET_MessageHeader)))
2578 if (0 != ntohl (t.reserved))
2580 GNUNET_break_op (0);
2584 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2585 "Decrypted `%s' from `%4s' with challenge %u using key %u\n",
2587 GNUNET_i2s (&t.target),
2588 ntohl (t.challenge), n->decrypt_key.crc32);
2590 if ((0 != memcmp (&t.target,
2592 sizeof (struct GNUNET_PeerIdentity))) ||
2593 (n->ping_challenge != ntohl (t.challenge)))
2595 /* PONG malformed */
2597 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2598 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
2599 "PONG", GNUNET_i2s (&n->peer), n->ping_challenge);
2600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2601 "Received malformed `%s' received from `%4s' with challenge %u\n",
2602 "PONG", GNUNET_i2s (&t.target), ntohl (t.challenge));
2604 GNUNET_break_op (0);
2609 case PEER_STATE_DOWN:
2610 GNUNET_break (0); /* should be impossible */
2612 case PEER_STATE_KEY_SENT:
2613 GNUNET_break (0); /* should be impossible, how did we decrypt? */
2615 case PEER_STATE_KEY_RECEIVED:
2616 n->status = PEER_STATE_KEY_CONFIRMED;
2617 if (n->bw_out_external_limit.value__ != t.inbound_bw_limit.value__)
2619 n->bw_out_external_limit = t.inbound_bw_limit;
2620 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
2621 n->bw_out_internal_limit);
2622 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
2624 GNUNET_TRANSPORT_set_quota (transport,
2628 GNUNET_TIME_UNIT_FOREVER_REL,
2632 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2633 "Confirmed key via `%s' message for peer `%4s'\n",
2634 "PONG", GNUNET_i2s (&n->peer));
2636 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2638 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2639 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2641 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
2642 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
2643 cnm.distance = htonl (n->last_distance);
2644 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
2646 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
2647 process_encrypted_neighbour_queue (n);
2649 case PEER_STATE_KEY_CONFIRMED:
2650 /* duplicate PONG? */
2660 * We received a SET_KEY message. Validate and update
2661 * our key material and status.
2663 * @param n the neighbour from which we received message m
2664 * @param m the set key message we received
2667 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
2669 struct SetKeyMessage *m_cpy;
2670 struct GNUNET_TIME_Absolute t;
2671 struct GNUNET_CRYPTO_AesSessionKey k;
2672 struct PingMessage *ping;
2673 struct PongMessage *pong;
2674 enum PeerStateMachine sender_status;
2677 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2678 "Core service receives `%s' request from `%4s'.\n",
2679 "SET_KEY", GNUNET_i2s (&n->peer));
2681 if (n->public_key == NULL)
2683 if (n->pitr != NULL)
2686 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2687 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
2693 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2694 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
2696 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
2697 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
2698 /* lookup n's public key, then try again */
2699 GNUNET_assert (n->skm == NULL);
2701 n->pitr = GNUNET_PEERINFO_iterate (cfg,
2705 GNUNET_TIME_UNIT_MINUTES,
2706 &process_hello_retry_handle_set_key, n);
2709 if (0 != memcmp (&m->target,
2711 sizeof (struct GNUNET_PeerIdentity)))
2713 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2714 _("Received `%s' message that was not for me. Ignoring.\n"),
2718 if ((ntohl (m->purpose.size) !=
2719 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2720 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2721 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2722 sizeof (struct GNUNET_PeerIdentity)) ||
2724 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
2725 &m->purpose, &m->signature, n->public_key)))
2727 /* invalid signature */
2728 GNUNET_break_op (0);
2731 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
2732 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
2733 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
2734 (t.value < n->decrypt_key_created.value))
2736 /* this could rarely happen due to massive re-ordering of
2737 messages on the network level, but is most likely either
2738 a bug or some adversary messing with us. Report. */
2739 GNUNET_break_op (0);
2743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2744 "Decrypting key material.\n");
2746 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
2749 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
2750 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
2751 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
2753 /* failed to decrypt !? */
2754 GNUNET_break_op (0);
2759 if (n->decrypt_key_created.value != t.value)
2761 /* fresh key, reset sequence numbers */
2762 n->last_sequence_number_received = 0;
2763 n->last_packets_bitmap = 0;
2764 n->decrypt_key_created = t;
2766 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
2769 case PEER_STATE_DOWN:
2770 n->status = PEER_STATE_KEY_RECEIVED;
2772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2773 "Responding to `%s' with my own key.\n", "SET_KEY");
2777 case PEER_STATE_KEY_SENT:
2778 case PEER_STATE_KEY_RECEIVED:
2779 n->status = PEER_STATE_KEY_RECEIVED;
2780 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
2781 (sender_status != PEER_STATE_KEY_CONFIRMED))
2784 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2785 "Responding to `%s' with my own key (other peer has status %u).\n",
2786 "SET_KEY", sender_status);
2791 case PEER_STATE_KEY_CONFIRMED:
2792 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
2793 (sender_status != PEER_STATE_KEY_CONFIRMED))
2796 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2797 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
2798 "SET_KEY", sender_status);
2807 if (n->pending_ping != NULL)
2809 ping = n->pending_ping;
2810 n->pending_ping = NULL;
2811 handle_ping (n, ping);
2814 if (n->pending_pong != NULL)
2816 pong = n->pending_pong;
2817 n->pending_pong = NULL;
2818 handle_pong (n, pong);
2825 * Send a P2P message to a client.
2827 * @param sender who sent us the message?
2828 * @param client who should we give the message to?
2829 * @param m contains the message to transmit
2830 * @param msize number of bytes in buf to transmit
2833 send_p2p_message_to_client (struct Neighbour *sender,
2834 struct Client *client,
2835 const void *m, size_t msize)
2837 char buf[msize + sizeof (struct NotifyTrafficMessage)];
2838 struct NotifyTrafficMessage *ntm;
2841 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2842 "Core service passes message from `%4s' of type %u to client.\n",
2843 GNUNET_i2s(&sender->peer),
2844 ntohs (((const struct GNUNET_MessageHeader *) m)->type));
2846 ntm = (struct NotifyTrafficMessage *) buf;
2847 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
2848 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
2849 ntm->distance = htonl (sender->last_distance);
2850 ntm->latency = GNUNET_TIME_relative_hton (sender->last_latency);
2851 ntm->peer = sender->peer;
2852 memcpy (&ntm[1], m, msize);
2853 send_to_client (client, &ntm->header, GNUNET_YES);
2858 * Deliver P2P message to interested clients.
2860 * @param sender who sent us the message?
2861 * @param m the message
2862 * @param msize size of the message (including header)
2865 deliver_message (struct Neighbour *sender,
2866 const struct GNUNET_MessageHeader *m, size_t msize)
2868 struct Client *cpos;
2874 type = ntohs (m->type);
2876 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2877 "Received encapsulated message of type %u from `%4s'\n",
2879 GNUNET_i2s (&sender->peer));
2881 dropped = GNUNET_YES;
2883 while (cpos != NULL)
2885 deliver_full = GNUNET_NO;
2886 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
2887 deliver_full = GNUNET_YES;
2890 for (tpos = 0; tpos < cpos->tcnt; tpos++)
2892 if (type != cpos->types[tpos])
2894 deliver_full = GNUNET_YES;
2898 if (GNUNET_YES == deliver_full)
2900 send_p2p_message_to_client (sender, cpos, m, msize);
2901 dropped = GNUNET_NO;
2903 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
2905 send_p2p_message_to_client (sender, cpos, m,
2906 sizeof (struct GNUNET_MessageHeader));
2910 if (dropped == GNUNET_YES)
2913 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2914 "Message of type %u from `%4s' not delivered to any client.\n",
2916 GNUNET_i2s (&sender->peer));
2918 /* FIXME: stats... */
2924 * Align P2P message and then deliver to interested clients.
2926 * @param sender who sent us the message?
2927 * @param buffer unaligned (!) buffer containing message
2928 * @param msize size of the message (including header)
2931 align_and_deliver (struct Neighbour *sender, const char *buffer, size_t msize)
2935 /* TODO: call to statistics? */
2936 memcpy (abuf, buffer, msize);
2937 deliver_message (sender, (const struct GNUNET_MessageHeader *) abuf, msize);
2942 * Deliver P2P messages to interested clients.
2944 * @param sender who sent us the message?
2945 * @param buffer buffer containing messages, can be modified
2946 * @param buffer_size size of the buffer (overall)
2947 * @param offset offset where messages in the buffer start
2950 deliver_messages (struct Neighbour *sender,
2951 const char *buffer, size_t buffer_size, size_t offset)
2953 struct GNUNET_MessageHeader *mhp;
2954 struct GNUNET_MessageHeader mh;
2958 while (offset + sizeof (struct GNUNET_MessageHeader) <= buffer_size)
2960 if (0 != offset % sizeof (uint16_t))
2962 /* outch, need to copy to access header */
2963 memcpy (&mh, &buffer[offset], sizeof (struct GNUNET_MessageHeader));
2968 /* can access header directly */
2969 mhp = (struct GNUNET_MessageHeader *) &buffer[offset];
2971 msize = ntohs (mhp->size);
2972 if (msize + offset > buffer_size)
2974 /* malformed message, header says it is larger than what
2975 would fit into the overall buffer */
2976 GNUNET_break_op (0);
2979 #if HAVE_UNALIGNED_64_ACCESS
2980 need_align = (0 != offset % 4) ? GNUNET_YES : GNUNET_NO;
2982 need_align = (0 != offset % 8) ? GNUNET_YES : GNUNET_NO;
2984 if (GNUNET_YES == need_align)
2985 align_and_deliver (sender, &buffer[offset], msize);
2987 deliver_message (sender,
2988 (const struct GNUNET_MessageHeader *)
2989 &buffer[offset], msize);
2996 * We received an encrypted message. Decrypt, validate and
2997 * pass on to the appropriate clients.
3000 handle_encrypted_message (struct Neighbour *n,
3001 const struct EncryptedMessage *m)
3003 size_t size = ntohs (m->header.size);
3005 struct EncryptedMessage *pt; /* plaintext */
3009 struct GNUNET_TIME_Absolute t;
3013 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3014 "Core service receives `%s' request from `%4s'.\n",
3015 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
3017 GNUNET_CRYPTO_hash (&m->iv_seed, sizeof (uint32_t), &iv);
3023 &buf[ENCRYPTED_HEADER_SIZE],
3024 size - ENCRYPTED_HEADER_SIZE))
3026 pt = (struct EncryptedMessage *) buf;
3029 GNUNET_CRYPTO_hash (&pt->sequence_number,
3030 size - ENCRYPTED_HEADER_SIZE - sizeof (GNUNET_HashCode), &ph);
3031 if (0 != memcmp (&ph,
3032 &pt->plaintext_hash,
3033 sizeof (GNUNET_HashCode)))
3035 /* checksum failed */
3036 GNUNET_break_op (0);
3040 /* validate sequence number */
3041 snum = ntohl (pt->sequence_number);
3042 if (n->last_sequence_number_received == snum)
3044 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3045 "Received duplicate message, ignoring.\n");
3046 /* duplicate, ignore */
3049 if ((n->last_sequence_number_received > snum) &&
3050 (n->last_sequence_number_received - snum > 32))
3052 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3053 "Received ancient out of sequence message, ignoring.\n");
3054 /* ancient out of sequence, ignore */
3057 if (n->last_sequence_number_received > snum)
3059 unsigned int rotbit =
3060 1 << (n->last_sequence_number_received - snum - 1);
3061 if ((n->last_packets_bitmap & rotbit) != 0)
3063 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3064 "Received duplicate message, ignoring.\n");
3065 /* duplicate, ignore */
3068 n->last_packets_bitmap |= rotbit;
3070 if (n->last_sequence_number_received < snum)
3072 n->last_packets_bitmap <<= (snum - n->last_sequence_number_received);
3073 n->last_sequence_number_received = snum;
3076 /* check timestamp */
3077 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
3078 if (GNUNET_TIME_absolute_get_duration (t).value > MAX_MESSAGE_AGE.value)
3080 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3082 ("Message received far too old (%llu ms). Content ignored.\n"),
3083 GNUNET_TIME_absolute_get_duration (t).value);
3087 /* process decrypted message(s) */
3088 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
3090 #if DEBUG_CORE_SET_QUOTA
3091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3092 "Received %u b/s as new inbound limit for peer `%4s'\n",
3093 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
3094 GNUNET_i2s (&n->peer));
3096 n->bw_out_external_limit = pt->inbound_bw_limit;
3097 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3098 n->bw_out_internal_limit);
3099 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3101 GNUNET_TRANSPORT_set_quota (transport,
3105 GNUNET_TIME_UNIT_FOREVER_REL,
3108 n->last_activity = GNUNET_TIME_absolute_get ();
3109 off = sizeof (struct EncryptedMessage);
3110 deliver_messages (n, buf, size, off);
3115 * Function called by the transport for each received message.
3117 * @param cls closure
3118 * @param peer (claimed) identity of the other peer
3119 * @param message the message
3120 * @param latency estimated latency for communicating with the
3121 * given peer (round-trip)
3122 * @param distance in overlay hops, as given by transport plugin
3125 handle_transport_receive (void *cls,
3126 const struct GNUNET_PeerIdentity *peer,
3127 const struct GNUNET_MessageHeader *message,
3128 struct GNUNET_TIME_Relative latency,
3129 unsigned int distance)
3131 struct Neighbour *n;
3132 struct GNUNET_TIME_Absolute now;
3138 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3139 "Received message of type %u from `%4s', demultiplexing.\n",
3140 ntohs (message->type), GNUNET_i2s (peer));
3142 n = find_neighbour (peer);
3144 n = create_neighbour (peer);
3147 n->last_latency = latency;
3148 n->last_distance = distance;
3149 up = (n->status == PEER_STATE_KEY_CONFIRMED);
3150 type = ntohs (message->type);
3151 size = ntohs (message->size);
3154 "Received message of type %u from `%4s'\n",
3160 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
3161 if (size != sizeof (struct SetKeyMessage))
3163 GNUNET_break_op (0);
3166 handle_set_key (n, (const struct SetKeyMessage *) message);
3168 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3169 if (size < sizeof (struct EncryptedMessage) +
3170 sizeof (struct GNUNET_MessageHeader))
3172 GNUNET_break_op (0);
3175 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3176 (n->status != PEER_STATE_KEY_CONFIRMED))
3178 GNUNET_break_op (0);
3181 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3183 case GNUNET_MESSAGE_TYPE_CORE_PING:
3184 if (size != sizeof (struct PingMessage))
3186 GNUNET_break_op (0);
3189 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3190 (n->status != PEER_STATE_KEY_CONFIRMED))
3193 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3194 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3195 "PING", GNUNET_i2s (&n->peer));
3197 GNUNET_free_non_null (n->pending_ping);
3198 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3199 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3202 handle_ping (n, (const struct PingMessage *) message);
3204 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3205 if (size != sizeof (struct PongMessage))
3207 GNUNET_break_op (0);
3210 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3211 (n->status != PEER_STATE_KEY_CONFIRMED) )
3214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3215 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3216 "PONG", GNUNET_i2s (&n->peer));
3218 GNUNET_free_non_null (n->pending_pong);
3219 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
3220 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
3223 handle_pong (n, (const struct PongMessage *) message);
3226 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3227 _("Unsupported message of type %u received.\n"), type);
3230 if (n->status == PEER_STATE_KEY_CONFIRMED)
3232 now = GNUNET_TIME_absolute_get ();
3233 n->last_activity = now;
3235 n->time_established = now;
3241 * Function that recalculates the bandwidth quota for the
3242 * given neighbour and transmits it to the transport service.
3244 * @param cls neighbour for the quota update
3248 neighbour_quota_update (void *cls,
3249 const struct GNUNET_SCHEDULER_TaskContext *tc)
3251 struct Neighbour *n = cls;
3252 struct GNUNET_BANDWIDTH_Value32NBO q_in;
3255 unsigned long long distributable;
3256 uint64_t need_per_peer;
3257 uint64_t need_per_second;
3259 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
3260 /* calculate relative preference among all neighbours;
3261 divides by a bit more to avoid division by zero AND to
3262 account for possibility of new neighbours joining any time
3263 AND to convert to double... */
3264 if (preference_sum == 0)
3266 pref_rel = 1.0 / (double) neighbour_count;
3270 pref_rel = n->current_preference / preference_sum;
3272 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
3273 GNUNET_TIME_UNIT_SECONDS);
3274 need_per_second = need_per_peer * neighbour_count;
3276 if (bandwidth_target_out_bps > need_per_second)
3277 distributable = bandwidth_target_out_bps - need_per_second;
3278 share = distributable * pref_rel;
3279 if (share + need_per_peer > ( (uint32_t)-1))
3280 q_in = GNUNET_BANDWIDTH_value_init ((uint32_t) -1);
3282 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
3283 /* check if we want to disconnect for good due to inactivity */
3284 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) &&
3285 (GNUNET_TIME_absolute_get_duration (n->time_established).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) )
3288 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3289 "Forcing disconnect of `%4s' due to inactivity (?).\n",
3290 GNUNET_i2s (&n->peer));
3292 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
3294 #if DEBUG_CORE_QUOTA
3295 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3296 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
3297 GNUNET_i2s (&n->peer),
3298 (unsigned int) ntohl (q_in.value__),
3299 bandwidth_target_out_bps,
3300 (unsigned int) ntohl (n->bw_in.value__),
3301 (unsigned int) ntohl (n->bw_out.value__),
3302 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
3304 if (n->bw_in.value__ != q_in.value__)
3307 GNUNET_TRANSPORT_set_quota (transport,
3311 GNUNET_TIME_UNIT_FOREVER_REL,
3314 schedule_quota_update (n);
3319 * Function called by transport to notify us that
3320 * a peer connected to us (on the network level).
3322 * @param cls closure
3323 * @param peer the peer that connected
3324 * @param latency current latency of the connection
3325 * @param distance in overlay hops, as given by transport plugin
3328 handle_transport_notify_connect (void *cls,
3329 const struct GNUNET_PeerIdentity *peer,
3330 struct GNUNET_TIME_Relative latency,
3331 unsigned int distance)
3333 struct Neighbour *n;
3334 struct GNUNET_TIME_Absolute now;
3335 struct ConnectNotifyMessage cnm;
3337 n = find_neighbour (peer);
3340 if (n->is_connected)
3342 /* duplicate connect notification!? */
3349 n = create_neighbour (peer);
3351 now = GNUNET_TIME_absolute_get ();
3352 n->is_connected = GNUNET_YES;
3353 n->last_latency = latency;
3354 n->last_distance = distance;
3355 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
3358 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
3362 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3363 "Received connection from `%4s'.\n",
3364 GNUNET_i2s (&n->peer));
3366 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
3367 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_PRE_CONNECT);
3368 cnm.distance = htonl (n->last_distance);
3369 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
3371 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_PRE_CONNECT);
3372 GNUNET_TRANSPORT_set_quota (transport,
3376 GNUNET_TIME_UNIT_FOREVER_REL,
3383 * Function called by transport telling us that a peer
3386 * @param cls closure
3387 * @param peer the peer that disconnected
3390 handle_transport_notify_disconnect (void *cls,
3391 const struct GNUNET_PeerIdentity *peer)
3393 struct DisconnectNotifyMessage cnm;
3394 struct Neighbour *n;
3397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3398 "Peer `%4s' disconnected from us.\n", GNUNET_i2s (peer));
3400 n = find_neighbour (peer);
3406 GNUNET_break (n->is_connected);
3407 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
3408 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
3410 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
3411 n->is_connected = GNUNET_NO;
3416 * Last task run during shutdown. Disconnects us from
3420 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3422 struct Neighbour *n;
3426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3427 "Core service shutting down.\n");
3429 GNUNET_assert (transport != NULL);
3430 GNUNET_TRANSPORT_disconnect (transport);
3432 while (NULL != (n = neighbours))
3434 neighbours = n->next;
3435 GNUNET_assert (neighbour_count > 0);
3439 GNUNET_SERVER_notification_context_destroy (notifier);
3441 while (NULL != (c = clients))
3442 handle_client_disconnect (NULL, c->client_handle);
3443 if (my_private_key != NULL)
3444 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3449 * Initiate core service.
3451 * @param cls closure
3452 * @param s scheduler to use
3453 * @param serv the initialized server
3454 * @param c configuration to use
3458 struct GNUNET_SCHEDULER_Handle *s,
3459 struct GNUNET_SERVER_Handle *serv,
3460 const struct GNUNET_CONFIGURATION_Handle *c)
3466 /* parse configuration */
3469 GNUNET_CONFIGURATION_get_value_number (c,
3472 &bandwidth_target_in_bps)) ||
3474 GNUNET_CONFIGURATION_get_value_number (c,
3477 &bandwidth_target_out_bps)) ||
3479 GNUNET_CONFIGURATION_get_value_filename (c,
3481 "HOSTKEY", &keyfile)))
3483 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3485 ("Core service is lacking key configuration settings. Exiting.\n"));
3486 GNUNET_SCHEDULER_shutdown (s);
3489 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3490 GNUNET_free (keyfile);
3491 if (my_private_key == NULL)
3493 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3494 _("Core service could not access hostkey. Exiting.\n"));
3495 GNUNET_SCHEDULER_shutdown (s);
3498 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3499 GNUNET_CRYPTO_hash (&my_public_key,
3500 sizeof (my_public_key), &my_identity.hashPubKey);
3501 /* setup notification */
3503 notifier = GNUNET_SERVER_notification_context_create (server,
3505 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
3506 /* setup transport connection */
3507 transport = GNUNET_TRANSPORT_connect (sched,
3510 &handle_transport_receive,
3511 &handle_transport_notify_connect,
3512 &handle_transport_notify_disconnect);
3513 GNUNET_assert (NULL != transport);
3514 GNUNET_SCHEDULER_add_delayed (sched,
3515 GNUNET_TIME_UNIT_FOREVER_REL,
3516 &cleaning_task, NULL);
3517 /* process client requests */
3518 GNUNET_SERVER_add_handlers (server, handlers);
3519 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3520 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
3526 * The main function for the transport service.
3528 * @param argc number of arguments from the command line
3529 * @param argv command line arguments
3530 * @return 0 ok, 1 on error
3533 main (int argc, char *const *argv)
3535 return (GNUNET_OK ==
3536 GNUNET_SERVICE_run (argc,
3539 GNUNET_SERVICE_OPTION_NONE,
3540 &run, NULL)) ? 0 : 1;
3543 /* end of gnunet-service-core.c */