2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file core/gnunet-service-core.c
23 * @brief high-level P2P messaging
24 * @author Christian Grothoff
28 * - write test for basic core functions:
30 * + transmit (encrypted) message [with handshake]
31 * + receive (encrypted) message, forward plaintext to clients
33 * - revisit API (which arguments are used, needed)?
34 * - add code to bound queue size when handling client's SEND message
35 * - add code to bound message queue size when passing messages to clients
36 * - add code to discard_expired_messages
37 * - add code to re-transmit key if first attempt failed
38 * + timeout on connect / key exchange, etc.
39 * + timeout for automatic re-try, etc.
40 * - add code to give up re-transmission of key if many attempts fail
41 * - add code to send PINGs if we are about to time-out otherwise
42 * ? add heuristic to do another send_key in "handle_set_key"
43 * in case previous attempt failed / didn't work / persist
44 * (but don't do it always to avoid storm of SET_KEY's going
45 * back and forth!) --- alternatively, add "status" field
46 * of the other peer to the set key message, that way we'd
48 * - check that hostkey used by transport (for HELLOs) is the
49 * same as the hostkey that we are using!
50 * - free list of clients on exit
51 * - topology management:
52 * + bootstrapping (transport offer hello, plugins)
53 * + internal neighbour selection
54 * + update bandwidth usage statistics
55 * + bandwidth allocation (transport set quota)
56 * - optimize lookup (many O(n) list traversals
57 * could ideally be changed to O(1) hash map lookups)
60 #include "gnunet_util_lib.h"
61 #include "gnunet_hello_lib.h"
62 #include "gnunet_peerinfo_service.h"
63 #include "gnunet_protocols.h"
64 #include "gnunet_signatures.h"
65 #include "gnunet_transport_service.h"
70 * Receive and send buffer windows grow over time. For
71 * how long can 'unused' bandwidth accumulate before we
72 * need to cap it? (specified in ms).
74 #define MAX_WINDOW_TIME (5 * 60 * 1000)
78 * Amount of bytes per minute (in/out) to assume initially
79 * (before either peer has communicated any particular
80 * preference). Should be rather low.
82 #define DEFAULT_BPM_IN_OUT 2048
86 * What is the maximum delay for a SET_KEY message?
88 #define MAX_SET_KEY_DELAY GNUNET_TIME_UNIT_SECONDS
92 * What how long do we wait for SET_KEY confirmation initially?
94 #define INITIAL_SET_KEY_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 3)
98 * What is the maximum delay for a PING message?
100 #define MAX_PING_DELAY GNUNET_TIME_UNIT_SECONDS
104 * What is the maximum delay for a PONG message?
106 #define MAX_PONG_DELAY GNUNET_TIME_UNIT_SECONDS
110 * What is the priority for a SET_KEY message?
112 #define SET_KEY_PRIORITY 0xFFFFFF
116 * What is the priority for a PING message?
118 #define PING_PRIORITY 0xFFFFFF
122 * What is the priority for a PONG message?
124 #define PONG_PRIORITY 0xFFFFFF
128 * What is the maximum age of a message for us to consider
129 * processing it? Note that this looks at the timestamp used
130 * by the other peer, so clock skew between machines does
131 * come into play here. So this should be picked high enough
132 * so that a little bit of clock skew does not prevent peers
133 * from connecting to us.
135 #define MAX_MESSAGE_AGE GNUNET_TIME_UNIT_DAYS
139 * What is the maximum size for encrypted messages? Note that this
140 * number imposes a clear limit on the maximum size of any message.
141 * Set to a value close to 64k but not so close that transports will
142 * have trouble with their headers.
144 #define MAX_ENCRYPTED_MESSAGE_SIZE (63 * 1024)
148 * State machine for our P2P encryption handshake. Everyone starts in
149 * "DOWN", if we receive the other peer's key (other peer initiated)
150 * we start in state RECEIVED (since we will immediately send our
151 * own); otherwise we start in SENT. If we get back a PONG from
152 * within either state, we move up to CONFIRMED (the PONG will always
153 * be sent back encrypted with the key we sent to the other peer).
155 enum PeerStateMachine
159 PEER_STATE_KEY_RECEIVED,
160 PEER_STATE_KEY_CONFIRMED
165 * Number of bytes (at the beginning) of "struct EncryptedMessage"
166 * that are NOT encrypted.
168 #define ENCRYPTED_HEADER_SIZE (sizeof(struct GNUNET_MessageHeader) + sizeof(uint32_t) + sizeof(GNUNET_HashCode))
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;
184 uint32_t reserved GNUNET_PACKED;
187 * Hash of the plaintext, used to verify message integrity;
188 * ALSO used as the IV for the symmetric cipher! Everything
189 * after this hash will be encrypted. ENCRYPTED_HEADER_SIZE
190 * must be set to the offset of the next field.
192 GNUNET_HashCode plaintext_hash;
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
203 * peer / how much is the sender willing to receive),
204 * in bytes per minute.
206 uint32_t inbound_bpm_limit GNUNET_PACKED;
209 * Timestamp. Used to prevent reply of ancient messages
210 * (recent messages are caught with the sequence number).
212 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 either CORE_PING or CORE_PONG.
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;
242 * Message transmitted to set (or update) a session key.
248 * Message type is either CORE_SET_KEY.
250 struct GNUNET_MessageHeader header;
253 * Status of the sender (should be in "enum PeerStateMachine"), nbo.
255 int32_t sender_status GNUNET_PACKED;
258 * Purpose of the signature, will be
259 * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
261 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
264 * At what time was this key created?
266 struct GNUNET_TIME_AbsoluteNBO creation_time;
269 * The encrypted session key.
271 struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
274 * Who is the intended recipient?
276 struct GNUNET_PeerIdentity target;
279 * Signature of the stuff above (starting at purpose).
281 struct GNUNET_CRYPTO_RsaSignature signature;
287 * Message waiting for transmission. This struct
288 * is followed by the actual content of the message.
294 * We keep messages in a linked list (for now).
296 struct MessageEntry *next;
299 * By when are we supposed to transmit this message?
301 struct GNUNET_TIME_Absolute deadline;
304 * How important is this message to us?
306 unsigned int priority;
309 * How long is the message? (number of bytes following
310 * the "struct MessageEntry", but not including the
311 * size of "struct MessageEntry" itself!)
316 * Was this message selected for transmission in the
317 * current round? GNUNET_YES or GNUNET_NO.
327 * We keep neighbours in a linked list (for now).
329 struct Neighbour *next;
332 * Unencrypted messages destined for this peer.
334 struct MessageEntry *messages;
337 * Head of the batched, encrypted message queue (already ordered,
338 * transmit starting with the head).
340 struct MessageEntry *encrypted_head;
343 * Tail of the batched, encrypted message queue (already ordered,
344 * append new messages to tail)
346 struct MessageEntry *encrypted_tail;
349 * Handle for pending requests for transmission to this peer
350 * with the transport service. NULL if no request is pending.
352 struct GNUNET_TRANSPORT_TransmitHandle *th;
355 * Public key of the neighbour, NULL if we don't have it yet.
357 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
360 * We received a PING message before we got the "public_key"
361 * (or the SET_KEY). We keep it here until we have a key
362 * to decrypt it. NULL if no PING is pending.
364 struct PingMessage *pending_ping;
367 * Identity of the neighbour.
369 struct GNUNET_PeerIdentity peer;
372 * Key we use to encrypt our messages for the other peer
373 * (initialized by us when we do the handshake).
375 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
378 * Key we use to decrypt messages from the other peer
379 * (given to us by the other peer during the handshake).
381 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
384 * ID of task used for re-trying plaintext scheduling.
386 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
389 * ID of task used for re-trying SET_KEY and PING message.
391 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
394 * At what time did we generate our encryption key?
396 struct GNUNET_TIME_Absolute encrypt_key_created;
399 * At what time did the other peer generate the decryption key?
401 struct GNUNET_TIME_Absolute decrypt_key_created;
404 * At what time did we initially establish (as in, complete session
405 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
407 struct GNUNET_TIME_Absolute time_established;
410 * At what time did we last receive an encrypted message from the
411 * other peer? Should be zero if status != KEY_CONFIRMED.
413 struct GNUNET_TIME_Absolute last_activity;
416 * Last latency observed from this peer.
418 struct GNUNET_TIME_Relative last_latency;
421 * At what frequency are we currently re-trying SET KEY messages?
423 struct GNUNET_TIME_Relative set_key_retry_frequency;
426 * Time of our last update to the "available_send_window".
428 struct GNUNET_TIME_Absolute last_asw_update;
431 * Time of our last update to the "available_recv_window".
433 struct GNUNET_TIME_Absolute last_arw_update;
436 * Number of bytes that we are eligible to transmit to this
437 * peer at this point. Incremented every minute by max_out_bpm,
438 * bounded by max_bpm (no back-log larger than MAX_BUF_FACT minutes,
439 * bandwidth-hogs are sampled at a frequency of about 78s!);
440 * may get negative if we have VERY high priority content.
442 long long available_send_window;
445 * How much downstream capacity of this peer has been reserved for
446 * our traffic? (Our clients can request that a certain amount of
447 * bandwidth is available for replies to them; this value is used to
448 * make sure that this reserved amount of bandwidth is actually
451 long long available_recv_window;
454 * How valueable were the messages of this peer recently?
456 double current_preference;
459 * Bit map indicating which of the 32 sequence numbers before the last
460 * were received (good for accepting out-of-order packets and
461 * estimating reliability of the connection)
463 unsigned int last_packets_bitmap;
466 * Number of messages in the message queue for this peer.
468 unsigned int message_queue_size;
471 * last sequence number received on this connection (highest)
473 uint32_t last_sequence_number_received;
476 * last sequence number transmitted
478 uint32_t last_sequence_number_sent;
481 * Available bandwidth in for this peer (current target).
486 * Available bandwidth out for this peer (current target).
491 * Internal bandwidth limit set for this peer (initially
492 * typcially set to "-1"). "bpm_out" is MAX of
493 * "bpm_out_internal_limit" and "bpm_out_external_limit".
495 uint32_t bpm_out_internal_limit;
498 * External bandwidth limit set for this peer by the
499 * peer that we are communicating with. "bpm_out" is MAX of
500 * "bpm_out_internal_limit" and "bpm_out_external_limit".
502 uint32_t bpm_out_external_limit;
505 * What was our PING challenge number?
507 uint32_t ping_challenge;
510 * What is our connection status?
512 enum PeerStateMachine status;
518 * Events are messages for clients. The struct
519 * itself is followed by the actual message.
524 * This is a linked list.
529 * Size of the message.
534 * Could this event be dropped if this queue
535 * is getting too large? (NOT YET USED!)
543 * Data structure for each client connected to the core service.
548 * Clients are kept in a linked list.
553 * Handle for the client with the server API.
555 struct GNUNET_SERVER_Client *client_handle;
558 * Linked list of messages we still need to deliver to
561 struct Event *event_head;
564 * Tail of the linked list of events.
566 struct Event *event_tail;
569 * Current transmit handle, NULL if no transmission request
572 struct GNUNET_NETWORK_TransmitHandle *th;
575 * Array of the types of messages this peer cares
576 * about (with "tcnt" entries). Allocated as part
577 * of this client struct, do not free!
582 * Options for messages this client cares about,
583 * see GNUNET_CORE_OPTION_ values.
588 * Number of types of incoming messages this client
589 * specifically cares about. Size of the "types" array.
599 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
604 static struct GNUNET_PeerIdentity my_identity;
609 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
614 struct GNUNET_SCHEDULER_Handle *sched;
619 struct GNUNET_CONFIGURATION_Handle *cfg;
624 static struct GNUNET_SERVER_Handle *server;
629 static struct GNUNET_TRANSPORT_Handle *transport;
632 * We keep neighbours in a linked list (for now).
634 static struct Neighbour *neighbours;
637 * Linked list of our clients.
639 static struct Client *clients;
643 * Recalculate the number of bytes we expect to
644 * receive or transmit in a given window.
646 * @param window pointer to the byte counter (updated)
647 * @param ts pointer to the timestamp (updated)
648 * @param bpm number of bytes per minute that should
649 * be added to the window.
652 update_window (long long *window,
653 struct GNUNET_TIME_Absolute *ts, unsigned int bpm)
655 struct GNUNET_TIME_Relative since;
657 since = GNUNET_TIME_absolute_get_duration (*ts);
658 if (since.value < 60 * 1000)
659 return; /* not even a minute has passed */
660 *ts = GNUNET_TIME_absolute_get ();
661 *window += (bpm * since.value) / 60 / 1000;
662 if (*window > MAX_WINDOW_TIME * bpm)
663 *window = MAX_WINDOW_TIME * bpm;
668 * Find the entry for the given neighbour.
670 * @param peer identity of the neighbour
671 * @return NULL if we are not connected, otherwise the
674 static struct Neighbour *
675 find_neighbour (const struct GNUNET_PeerIdentity *peer)
677 struct Neighbour *ret;
680 while ((ret != NULL) &&
681 (0 != memcmp (&ret->peer,
682 peer, sizeof (struct GNUNET_PeerIdentity))))
689 * Find the entry for the given client.
691 * @param client handle for the client
692 * @return NULL if we are not connected, otherwise the
695 static struct Client *
696 find_client (const struct GNUNET_SERVER_Client *client)
701 while ((ret != NULL) && (client != ret->client_handle))
708 * If necessary, initiate a request with the server to
709 * transmit messages from the queue of the given client.
710 * @param client who to transfer messages to
712 static void request_transmit (struct Client *client);
716 * Client is ready to receive data, provide it.
718 * @param size number of bytes available in buf
719 * @param buf where the callee should write the message
720 * @return number of bytes written to buf
723 do_client_transmit (void *cls, size_t size, void *buf)
725 struct Client *client = cls;
731 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
732 "Client ready to receive %u bytes.\n", size);
735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
736 "Failed to transmit data to client (disconnect)?\n");
737 return 0; /* we'll surely get a disconnect soon... */
741 while ((NULL != (e = client->event_head)) && (e->size <= size))
743 memcpy (&tgt[ret], &e[1], e->size);
746 client->event_head = e->next;
749 GNUNET_assert (ret > 0);
750 if (client->event_head == NULL)
751 client->event_tail = NULL;
752 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
753 "Transmitting %u bytes to client\n", ret);
754 request_transmit (client);
760 * If necessary, initiate a request with the server to
761 * transmit messages from the queue of the given client.
762 * @param client who to transfer messages to
765 request_transmit (struct Client *client)
768 if (NULL != client->th)
769 return; /* already pending */
770 if (NULL == client->event_head)
771 return; /* no more events pending */
772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
773 "Asking server to transmit %u bytes to client\n",
774 client->event_head->size);
776 = GNUNET_SERVER_notify_transmit_ready (client->client_handle,
777 client->event_head->size,
778 GNUNET_TIME_UNIT_FOREVER_REL,
779 &do_client_transmit, client);
784 * Send a message to one of our clients.
785 * @param client target for the message
786 * @param msg message to transmit
787 * @param can_drop could this message be dropped if the
788 * client's queue is getting too large?
791 send_to_client (struct Client *client,
792 const struct GNUNET_MessageHeader *msg, int can_drop)
797 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
798 "Preparing to send message of type %u to client.\n",
800 msize = ntohs (msg->size);
801 e = GNUNET_malloc (sizeof (struct Event) + msize);
803 if (client->event_tail != NULL)
804 client->event_tail->next = e;
806 client->event_head = e;
807 client->event_tail = e;
808 e->can_drop = can_drop;
810 memcpy (&e[1], msg, msize);
811 request_transmit (client);
816 * Send a message to all of our current clients.
819 send_to_all_clients (const struct GNUNET_MessageHeader *msg, int can_drop)
826 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;
846 struct ConnectNotifyMessage cnm;
848 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
849 "Client connecting to core service with `%s' message\n",
851 /* check that we don't have an entry already */
855 if (client == c->client_handle)
858 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
863 msize = ntohs (message->size);
864 if (msize < sizeof (struct InitMessage))
867 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
870 im = (const struct InitMessage *) message;
871 types = (const uint16_t *) &im[1];
872 msize -= sizeof (struct InitMessage);
873 c = GNUNET_malloc (sizeof (struct Client) + msize);
874 c->client_handle = client;
877 memcpy (&c[1], types, msize);
878 c->types = (uint16_t *) & c[1];
879 c->options = ntohl (im->options);
880 c->tcnt = msize / sizeof (uint16_t);
881 /* send init reply message */
882 irm.header.size = htons (sizeof (struct InitReplyMessage));
883 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
884 irm.reserved = htonl (0);
885 memcpy (&irm.publicKey,
887 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
888 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
889 "Sending `%s' message to client.\n", "INIT_REPLY");
890 send_to_client (c, &irm.header, GNUNET_NO);
891 /* notify new client about existing neighbours */
892 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
893 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
897 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
898 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
899 cnm.bpm_available = htonl (n->bpm_out);
900 cnm.last_activity = GNUNET_TIME_absolute_hton (n->last_activity);
902 send_to_client (c, &cnm.header, GNUNET_NO);
905 GNUNET_SERVER_receive_done (client, GNUNET_OK);
910 * A client disconnected, clean up.
913 * @param client identification of the client
916 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
921 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
922 "Client has disconnected from core service.\n");
927 if (client == pos->client_handle)
932 prev->next = pos->next;
934 GNUNET_NETWORK_notify_transmit_ready_cancel (pos->th);
941 /* client never sent INIT */
946 * Handle REQUEST_CONFIGURE request.
949 handle_client_request_configure (void *cls,
950 struct GNUNET_SERVER_Client *client,
951 const struct GNUNET_MessageHeader *message)
953 const struct RequestConfigureMessage *rcm;
955 struct ConfigurationInfoMessage cim;
959 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
960 "Core service receives `%s' request.\n", "CONFIGURE");
961 rcm = (const struct RequestConfigureMessage *) message;
962 n = find_neighbour (&rcm->peer);
963 memset (&cim, 0, sizeof (cim));
964 if ((n != NULL) && (n->status == PEER_STATE_KEY_CONFIRMED))
966 n->bpm_out_internal_limit = ntohl (rcm->limit_outbound_bpm);
967 n->bpm_out = GNUNET_MAX (n->bpm_out_internal_limit,
968 n->bpm_out_external_limit);
969 reserv = ntohl (rcm->reserve_inbound);
972 n->available_recv_window += reserv;
976 update_window (&n->available_recv_window,
977 &n->last_arw_update, n->bpm_in);
978 if (n->available_recv_window < reserv)
979 reserv = n->available_recv_window;
980 n->available_recv_window -= reserv;
982 n->current_preference += rcm->preference_change;
983 if (n->current_preference < 0)
984 n->current_preference = 0;
985 cim.reserved_amount = htonl (reserv);
986 cim.bpm_in = htonl (n->bpm_in);
987 cim.bpm_out = htonl (n->bpm_out);
988 cim.latency = GNUNET_TIME_relative_hton (n->last_latency);
989 cim.preference = n->current_preference;
991 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
992 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
993 cim.peer = rcm->peer;
994 c = find_client (client);
1000 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1001 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1002 send_to_client (c, &cim.header, GNUNET_NO);
1007 * Check if we have encrypted messages for the specified neighbour
1008 * pending, and if so, check with the transport about sending them
1011 * @param n neighbour to check.
1013 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1017 * Function called when the transport service is ready to
1018 * receive an encrypted message for the respective peer
1020 * @param cls neighbour to use message from
1021 * @param size number of bytes we can transmit
1022 * @param buf where to copy the message
1023 * @return number of bytes transmitted
1026 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1028 struct Neighbour *n = cls;
1029 struct MessageEntry *m;
1034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1035 "Transport ready to receive %u bytes for `%4s'\n",
1036 size, GNUNET_i2s (&n->peer));
1037 GNUNET_assert (NULL != (m = n->encrypted_head));
1038 n->encrypted_head = m->next;
1039 if (m->next == NULL)
1040 n->encrypted_tail = NULL;
1045 GNUNET_assert (size >= m->size);
1046 memcpy (cbuf, &m[1], m->size);
1048 process_encrypted_neighbour_queue (n);
1049 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1050 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1051 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1052 ret, GNUNET_i2s (&n->peer));
1056 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1057 "Transmission for message of type %u and size %u failed\n",
1058 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1067 * Check if we have plaintext messages for the specified neighbour
1068 * pending, and if so, consider batching and encrypting them (and
1069 * then trigger processing of the encrypted queue if needed).
1071 * @param n neighbour to check.
1073 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1077 * Check if we have encrypted messages for the specified neighbour
1078 * pending, and if so, check with the transport about sending them
1081 * @param n neighbour to check.
1084 process_encrypted_neighbour_queue (struct Neighbour *n)
1088 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1089 "Asked to process encrypted queue, but request already pending.\n");
1090 return; /* already pending */
1092 if (n->encrypted_head == NULL)
1094 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1095 "Encrypted queue empty, trying plaintext queue instead.\n");
1096 process_plaintext_neighbour_queue (n);
1099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1100 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1101 n->encrypted_head->size,
1102 GNUNET_i2s (&n->peer),
1103 GNUNET_TIME_absolute_get_remaining (n->
1104 encrypted_head->deadline).
1107 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1108 n->encrypted_head->size,
1109 GNUNET_TIME_absolute_get_remaining
1110 (n->encrypted_head->deadline),
1111 ¬ify_encrypted_transmit_ready,
1115 /* message request too large (oops) */
1117 /* FIXME: handle error somehow! */
1123 * Decrypt size bytes from in and write the result to out. Use the
1124 * key for inbound traffic of the given neighbour. This function does
1125 * NOT do any integrity-checks on the result.
1127 * @param n neighbour we are receiving from
1128 * @param iv initialization vector to use
1129 * @param in ciphertext
1130 * @param out plaintext
1131 * @param size size of in/out
1132 * @return GNUNET_OK on success
1135 do_decrypt (struct Neighbour *n,
1136 const GNUNET_HashCode * iv,
1137 const void *in, void *out, size_t size)
1139 if (size != (uint16_t) size)
1144 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1145 (n->status != PEER_STATE_KEY_CONFIRMED))
1147 GNUNET_break_op (0);
1148 return GNUNET_SYSERR;
1151 GNUNET_CRYPTO_aes_decrypt (&n->decrypt_key,
1155 GNUNET_CRYPTO_AesInitializationVector *) iv,
1159 return GNUNET_SYSERR;
1161 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1162 "Decrypted %u bytes from `%4s' using key %u\n",
1163 size, GNUNET_i2s (&n->peer), n->decrypt_key.crc32);
1169 * Encrypt size bytes from in and write the result to out. Use the
1170 * key for outbound traffic of the given neighbour.
1172 * @param n neighbour we are sending to
1173 * @param iv initialization vector to use
1174 * @param in ciphertext
1175 * @param out plaintext
1176 * @param size size of in/out
1177 * @return GNUNET_OK on success
1180 do_encrypt (struct Neighbour *n,
1181 const GNUNET_HashCode * iv,
1182 const void *in, void *out, size_t size)
1184 if (size != (uint16_t) size)
1189 GNUNET_assert (size ==
1190 GNUNET_CRYPTO_aes_encrypt (in,
1194 GNUNET_CRYPTO_AesInitializationVector
1196 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1197 "Encrypted %u bytes for `%4s' using key %u\n", size,
1198 GNUNET_i2s (&n->peer), n->encrypt_key.crc32);
1204 * Select messages for transmission. This heuristic uses a combination
1205 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1206 * and priority-based discard (in case no feasible schedule exist) and
1207 * speculative optimization (defer any kind of transmission until
1208 * we either create a batch of significant size, 25% of max, or until
1209 * we are close to a deadline). Furthermore, when scheduling the
1210 * heuristic also packs as many messages into the batch as possible,
1211 * starting with those with the earliest deadline. Yes, this is fun.
1213 * @param n neighbour to select messages from
1214 * @param size number of bytes to select for transmission
1215 * @param retry_time set to the time when we should try again
1216 * (only valid if this function returns zero)
1217 * @return number of bytes selected, or 0 if we decided to
1218 * defer scheduling overall; in that case, retry_time is set.
1221 select_messages (struct Neighbour *n,
1222 size_t size, struct GNUNET_TIME_Relative *retry_time)
1224 struct MessageEntry *pos;
1225 struct MessageEntry *min;
1226 struct MessageEntry *last;
1227 unsigned int min_prio;
1228 struct GNUNET_TIME_Absolute t;
1229 struct GNUNET_TIME_Absolute now;
1232 unsigned long long slack; /* how long could we wait before missing deadlines? */
1234 int discard_low_prio;
1236 GNUNET_assert (NULL != n->messages);
1237 now = GNUNET_TIME_absolute_get ();
1238 /* last entry in linked list of messages processed */
1240 /* should we remove the entry with the lowest
1241 priority from consideration for scheduling at the
1243 discard_low_prio = GNUNET_YES;
1244 while (GNUNET_YES == discard_low_prio)
1248 discard_low_prio = GNUNET_NO;
1249 /* number of bytes available for transmission at time "t" */
1250 avail = n->available_send_window;
1251 t = n->last_asw_update;
1252 /* how many bytes have we (hyptothetically) scheduled so far */
1254 /* maximum time we can wait before transmitting anything
1255 and still make all of our deadlines */
1259 /* note that we use "*2" here because we want to look
1260 a bit further into the future; much more makes no
1261 sense since new message might be scheduled in the
1263 while ((pos != NULL) && (off < size * 2))
1265 if (pos->do_transmit == GNUNET_YES)
1267 /* already removed from consideration */
1271 if (discard_low_prio == GNUNET_NO)
1273 delta = pos->deadline.value;
1274 if (delta < t.value)
1277 delta = t.value - delta;
1278 avail += delta * n->bpm_out / 1000 / 60;
1279 if (avail < pos->size)
1281 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1286 /* update slack, considering both its absolute deadline
1287 and relative deadlines caused by other messages
1288 with their respective load */
1289 slack = GNUNET_MIN (slack, avail / n->bpm_out);
1290 if (pos->deadline.value < now.value)
1294 GNUNET_MIN (slack, pos->deadline.value - now.value);
1298 t.value = GNUNET_MAX (pos->deadline.value, t.value);
1299 if (pos->priority <= min_prio)
1301 /* update min for discard */
1302 min_prio = pos->priority;
1307 if (discard_low_prio)
1309 GNUNET_assert (min != NULL);
1310 /* remove lowest-priority entry from consideration */
1311 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1315 /* guard against sending "tiny" messages with large headers without
1317 if ((slack > 1000) && (size > 4 * off))
1319 /* less than 25% of message would be filled with
1320 deadlines still being met if we delay by one
1321 second or more; so just wait for more data */
1322 retry_time->value = slack / 2;
1323 /* reset do_transmit values for next time */
1326 pos->do_transmit = GNUNET_NO;
1331 /* select marked messages (up to size) for transmission */
1336 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
1338 pos->do_transmit = GNUNET_YES; /* mark for transmission */
1343 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
1346 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1347 "Selected %u bytes of plaintext messages for transmission to `%4s'.\n",
1348 off, GNUNET_i2s (&n->peer));
1354 * Batch multiple messages into a larger buffer.
1356 * @param n neighbour to take messages from
1357 * @param buf target buffer
1358 * @param size size of buf
1359 * @param deadline set to transmission deadline for the result
1360 * @param retry_time set to the time when we should try again
1361 * (only valid if this function returns zero)
1362 * @param priority set to the priority of the batch
1363 * @return number of bytes written to buf (can be zero)
1366 batch_message (struct Neighbour *n,
1369 struct GNUNET_TIME_Absolute *deadline,
1370 struct GNUNET_TIME_Relative *retry_time,
1371 unsigned int *priority)
1373 struct MessageEntry *pos;
1374 struct MessageEntry *prev;
1375 struct MessageEntry *next;
1380 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1381 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
1382 if (0 == select_messages (n, size, retry_time))
1384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1385 "No messages selected, will try again in %llu ms\n",
1391 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
1394 if (GNUNET_YES == pos->do_transmit)
1396 GNUNET_assert (pos->size <= size);
1397 memcpy (&buf[ret], &pos[1], pos->size);
1400 *priority += pos->priority;
1401 deadline->value = GNUNET_MIN (deadline->value, pos->deadline.value);
1419 * Remove messages with deadlines that have long expired from
1422 * @param n neighbour to inspect
1425 discard_expired_messages (struct Neighbour *n)
1432 * Signature of the main function of a task.
1434 * @param cls closure
1435 * @param tc context information (why was this task triggered now)
1438 retry_plaintext_processing (void *cls,
1439 const struct GNUNET_SCHEDULER_TaskContext *tc)
1441 struct Neighbour *n = cls;
1443 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_PREREQUISITE_TASK;
1444 process_plaintext_neighbour_queue (n);
1449 * Send our key (and encrypted PING) to the other peer.
1451 * @param n the other peer
1453 static void send_key (struct Neighbour *n);
1457 * Check if we have plaintext messages for the specified neighbour
1458 * pending, and if so, consider batching and encrypting them (and
1459 * then trigger processing of the encrypted queue if needed).
1461 * @param n neighbour to check.
1464 process_plaintext_neighbour_queue (struct Neighbour *n)
1466 char pbuf[MAX_ENCRYPTED_MESSAGE_SIZE]; /* plaintext */
1469 struct EncryptedMessage *em; /* encrypted message */
1470 struct EncryptedMessage *ph; /* plaintext header */
1471 struct MessageEntry *me;
1472 unsigned int priority;
1473 struct GNUNET_TIME_Absolute deadline;
1474 struct GNUNET_TIME_Relative retry_time;
1476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1477 "Processing plaintext message queue for `%4s', scheduling messages.\n",
1478 GNUNET_i2s (&n->peer));
1479 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_PREREQUISITE_TASK)
1481 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1482 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_PREREQUISITE_TASK;
1486 case PEER_STATE_DOWN:
1488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1489 "Not yet connected, deferring processing of plaintext messages.\n");
1491 case PEER_STATE_KEY_SENT:
1492 GNUNET_assert (n->retry_set_key_task !=
1493 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK);
1494 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1495 "Not yet connected, deferring processing of plaintext messages.\n");
1497 case PEER_STATE_KEY_RECEIVED:
1498 GNUNET_assert (n->retry_set_key_task !=
1499 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK);
1500 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1501 "Not yet connected, deferring processing of plaintext messages.\n");
1503 case PEER_STATE_KEY_CONFIRMED:
1504 /* ready to continue */
1507 if (n->messages == NULL)
1509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1510 "Plaintext message queue is empty.\n");
1511 return; /* no pending messages */
1513 discard_expired_messages (n);
1514 if (n->encrypted_head != NULL)
1516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1517 "Encrypted message queue is still full, delaying plaintext processing.\n");
1518 return; /* wait for messages already encrypted to be
1521 ph = (struct EncryptedMessage *) pbuf;
1522 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1524 used = sizeof (struct EncryptedMessage);
1526 used += batch_message (n,
1528 MAX_ENCRYPTED_MESSAGE_SIZE - used,
1529 &deadline, &retry_time, &priority);
1530 if (used == sizeof (struct EncryptedMessage))
1532 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1533 "No messages selected for processing at this time, will try again later.\n");
1534 /* no messages selected for sending, try again later... */
1535 n->retry_plaintext_task =
1536 GNUNET_SCHEDULER_add_delayed (sched,
1538 GNUNET_SCHEDULER_PRIORITY_IDLE,
1539 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
1541 &retry_plaintext_processing, n);
1545 ph->sequence_number = htonl (++n->last_sequence_number_sent);
1546 ph->inbound_bpm_limit = htonl (n->bpm_in);
1547 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1549 /* setup encryption message header */
1550 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
1551 me->deadline = deadline;
1552 me->priority = priority;
1554 em = (struct EncryptedMessage *) &me[1];
1555 em->header.size = htons (used);
1556 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
1557 em->reserved = htonl (0);
1558 esize = used - ENCRYPTED_HEADER_SIZE;
1559 GNUNET_CRYPTO_hash (&ph->sequence_number, esize, &em->plaintext_hash);
1561 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1562 "Encrypting plaintext messages for transmission.\n");
1563 GNUNET_assert (GNUNET_OK ==
1565 &em->plaintext_hash,
1566 &ph->sequence_number,
1567 &em->sequence_number, esize));
1568 /* append to transmission list */
1569 if (n->encrypted_tail == NULL)
1570 n->encrypted_head = me;
1572 n->encrypted_tail->next = me;
1573 n->encrypted_tail = me;
1574 process_encrypted_neighbour_queue (n);
1579 * Handle CORE_SEND request.
1582 handle_client_send (void *cls,
1583 struct GNUNET_SERVER_Client *client,
1584 const struct GNUNET_MessageHeader *message);
1588 * Function called to notify us that we either succeeded
1589 * or failed to connect (at the transport level) to another
1590 * peer. We should either free the message we were asked
1591 * to transmit or re-try adding it to the queue.
1593 * @param cls closure
1594 * @param size number of bytes available in buf
1595 * @param buf where the callee should write the message
1596 * @return number of bytes written to buf
1599 send_connect_continuation (void *cls, size_t size, void *buf)
1601 struct SendMessage *sm = cls;
1605 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1606 "Asked to send message to disconnected peer `%4s' and connection failed. Discarding message.\n",
1607 GNUNET_i2s (&sm->peer));
1611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1612 "Connection to peer `%4s' succeeded, retrying original send request\n",
1613 GNUNET_i2s (&sm->peer));
1614 handle_client_send (NULL, NULL, &sm->header);
1621 * Handle CORE_SEND request.
1624 handle_client_send (void *cls,
1625 struct GNUNET_SERVER_Client *client,
1626 const struct GNUNET_MessageHeader *message)
1628 const struct SendMessage *sm;
1629 struct SendMessage *smc;
1630 const struct GNUNET_MessageHeader *mh;
1631 struct Neighbour *n;
1632 struct MessageEntry *pred;
1633 struct MessageEntry *pos;
1634 struct MessageEntry *e;
1637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1638 "Core service receives `%s' request.\n", "SEND");
1639 msize = ntohs (message->size);
1641 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
1645 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1648 sm = (const struct SendMessage *) message;
1649 msize -= sizeof (struct SendMessage);
1650 mh = (const struct GNUNET_MessageHeader *) &sm[1];
1651 if (msize != ntohs (mh->size))
1655 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1658 n = find_neighbour (&sm->peer);
1661 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1662 "Not yet connected to `%4s', will try to establish connection\n",
1663 GNUNET_i2s (&sm->peer));
1664 msize += sizeof (struct SendMessage);
1665 /* ask transport to connect to the peer */
1666 /* FIXME: this code does not handle the
1667 case where we get multiple SendMessages before
1668 transport responds to this request;
1669 => need to track pending requests! */
1670 smc = GNUNET_malloc (msize);
1671 memcpy (smc, sm, msize);
1672 GNUNET_TRANSPORT_notify_transmit_ready (transport,
1675 GNUNET_TIME_absolute_get_remaining
1676 (GNUNET_TIME_absolute_ntoh
1678 &send_connect_continuation,
1681 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1685 "Core queues %u bytes of plaintext data for transmission to `%4s'.\n",
1686 msize, GNUNET_i2s (&sm->peer));
1687 /* FIXME: consider bounding queue size */
1688 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
1689 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
1690 e->priority = ntohl (sm->priority);
1692 memcpy (&e[1], mh, msize);
1694 /* insert, keep list sorted by deadline */
1697 while ((pos != NULL) && (pos->deadline.value < e->deadline.value))
1708 /* consider scheduling now */
1709 process_plaintext_neighbour_queue (n);
1711 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1716 * List of handlers for the messages understood by this
1719 static struct GNUNET_SERVER_MessageHandler handlers[] = {
1720 {&handle_client_init, NULL,
1721 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
1722 {&handle_client_request_configure, NULL,
1723 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONFIGURE,
1724 sizeof (struct RequestConfigureMessage)},
1725 {&handle_client_send, NULL,
1726 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
1732 * PEERINFO is giving us a HELLO for a peer. Add the
1733 * public key to the neighbour's struct and retry
1734 * send_key. Or, if we did not get a HELLO, just do
1738 * @param peer the peer for which this is the HELLO
1739 * @param hello HELLO message of that peer
1740 * @param trust amount of trust we currently have in that peer
1743 process_hello_retry_send_key (void *cls,
1744 const struct GNUNET_PeerIdentity *peer,
1745 const struct GNUNET_HELLO_Message *hello,
1748 struct Neighbour *n;
1752 n = find_neighbour (peer);
1755 if (n->public_key != NULL)
1757 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1758 "Received new HELLO for `%4s', initiating key exchange.\n",
1761 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1762 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
1764 GNUNET_free (n->public_key);
1765 n->public_key = NULL;
1773 * Task that will retry "send_key" if our previous attempt failed
1777 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1779 struct Neighbour *n = cls;
1781 GNUNET_assert (n->status != PEER_STATE_KEY_CONFIRMED);
1782 n->retry_set_key_task = GNUNET_SCHEDULER_NO_PREREQUISITE_TASK;
1783 n->set_key_retry_frequency =
1784 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
1790 * Send our key (and encrypted PING) to the other peer.
1792 * @param n the other peer
1795 send_key (struct Neighbour *n)
1797 struct SetKeyMessage *sm;
1798 struct MessageEntry *me;
1799 struct PingMessage pp;
1800 struct PingMessage *pm;
1802 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1803 "Asked to perform key exchange with `%4s'.\n",
1804 GNUNET_i2s (&n->peer));
1805 if (n->public_key == NULL)
1807 /* lookup n's public key, then try again */
1808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1809 "Lacking public key for `%4s', trying to obtain one.\n",
1810 GNUNET_i2s (&n->peer));
1811 GNUNET_PEERINFO_for_all (cfg,
1815 GNUNET_TIME_UNIT_MINUTES,
1816 &process_hello_retry_send_key, NULL);
1819 /* first, set key message */
1820 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1821 sizeof (struct SetKeyMessage));
1822 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
1823 me->priority = SET_KEY_PRIORITY;
1824 me->size = sizeof (struct SetKeyMessage);
1825 if (n->encrypted_head == NULL)
1826 n->encrypted_head = me;
1828 n->encrypted_tail->next = me;
1829 n->encrypted_tail = me;
1830 sm = (struct SetKeyMessage *) &me[1];
1831 sm->header.size = htons (sizeof (struct SetKeyMessage));
1832 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
1833 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
1834 PEER_STATE_KEY_SENT : n->status));
1836 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
1837 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
1838 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
1839 sizeof (struct GNUNET_PeerIdentity));
1840 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
1841 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
1842 sm->target = n->peer;
1843 GNUNET_assert (GNUNET_OK ==
1844 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
1846 GNUNET_CRYPTO_AesSessionKey),
1848 &sm->encrypted_key));
1849 GNUNET_assert (GNUNET_OK ==
1850 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
1853 /* second, encrypted PING message */
1854 me = GNUNET_malloc (sizeof (struct MessageEntry) +
1855 sizeof (struct PingMessage));
1856 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
1857 me->priority = PING_PRIORITY;
1858 me->size = sizeof (struct PingMessage);
1859 n->encrypted_tail->next = me;
1860 n->encrypted_tail = me;
1861 pm = (struct PingMessage *) &me[1];
1862 pm->header.size = htons (sizeof (struct PingMessage));
1863 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
1864 pp.challenge = htonl (n->ping_challenge);
1865 pp.target = n->peer;
1866 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1867 "Encrypting `%s' and `%s' messages for `%4s'.\n",
1868 "SET_KEY", "PING", GNUNET_i2s (&n->peer));
1869 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1870 "Sending `%s' to `%4s' with challenge %u encrypted using key %u\n",
1872 GNUNET_i2s (&n->peer), n->ping_challenge, n->encrypt_key.crc32);
1874 &n->peer.hashPubKey,
1877 sizeof (struct PingMessage) -
1878 sizeof (struct GNUNET_MessageHeader));
1882 case PEER_STATE_DOWN:
1883 n->status = PEER_STATE_KEY_SENT;
1885 case PEER_STATE_KEY_SENT:
1887 case PEER_STATE_KEY_RECEIVED:
1889 case PEER_STATE_KEY_CONFIRMED:
1896 /* trigger queue processing */
1897 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1898 "Triggering processing of encrypted message queue.\n");
1899 process_encrypted_neighbour_queue (n);
1900 if (n->status != PEER_STATE_KEY_CONFIRMED)
1901 n->retry_set_key_task
1902 = GNUNET_SCHEDULER_add_delayed (sched,
1904 GNUNET_SCHEDULER_PRIORITY_KEEP,
1905 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
1906 n->set_key_retry_frequency,
1907 &set_key_retry_task, n);
1912 * We received a SET_KEY message. Validate and update
1913 * our key material and status.
1915 * @param n the neighbour from which we received message m
1916 * @param m the set key message we received
1919 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m);
1923 * PEERINFO is giving us a HELLO for a peer. Add the public key to
1924 * the neighbour's struct and retry handling the set_key message. Or,
1925 * if we did not get a HELLO, just free the set key message.
1927 * @param cls pointer to the set key message
1928 * @param peer the peer for which this is the HELLO
1929 * @param hello HELLO message of that peer
1930 * @param trust amount of trust we currently have in that peer
1933 process_hello_retry_handle_set_key (void *cls,
1934 const struct GNUNET_PeerIdentity *peer,
1935 const struct GNUNET_HELLO_Message *hello,
1938 struct SetKeyMessage *sm = cls;
1939 struct Neighbour *n;
1946 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1947 "Looking for peer `%4s' to handle `%s' message.\n",
1948 GNUNET_i2s (peer), "SET_KEY");
1949 n = find_neighbour (peer);
1955 if (n->public_key != NULL)
1956 return; /* multiple HELLOs match!? */
1958 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1959 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
1961 GNUNET_free (n->public_key);
1962 n->public_key = NULL;
1965 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1966 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
1967 "HELLO", GNUNET_i2s (peer), "SET_KEY");
1968 handle_set_key (n, sm);
1973 * We received a PING message. Validate and transmit
1976 * @param n sender of the PING
1977 * @param m the encrypted PING message itself
1980 handle_ping (struct Neighbour *n, const struct PingMessage *m)
1982 struct PingMessage t;
1983 struct PingMessage *tp;
1984 struct MessageEntry *me;
1986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1987 "Core service receives `%s' request from `%4s'.\n",
1988 "PING", GNUNET_i2s (&n->peer));
1991 &my_identity.hashPubKey,
1994 sizeof (struct PingMessage) -
1995 sizeof (struct GNUNET_MessageHeader)))
1997 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1998 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u\n",
2000 GNUNET_i2s (&t.target),
2001 ntohl (t.challenge), n->decrypt_key.crc32);
2002 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2003 "Target of `%s' request is `%4s'.\n",
2004 "PING", GNUNET_i2s (&t.target));
2005 if (0 != memcmp (&t.target,
2006 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2008 GNUNET_break_op (0);
2011 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2012 sizeof (struct PingMessage));
2013 if (n->encrypted_tail != NULL)
2014 n->encrypted_tail->next = me;
2017 n->encrypted_tail = me;
2018 n->encrypted_head = me;
2020 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
2021 me->priority = PONG_PRIORITY;
2022 me->size = sizeof (struct PingMessage);
2023 tp = (struct PingMessage *) &me[1];
2024 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
2025 tp->header.size = htons (sizeof (struct PingMessage));
2027 &my_identity.hashPubKey,
2030 sizeof (struct PingMessage) -
2031 sizeof (struct GNUNET_MessageHeader));
2032 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2033 "Encrypting `%s' with challenge %u using key %u\n", "PONG",
2034 ntohl (t.challenge), n->encrypt_key.crc32);
2035 /* trigger queue processing */
2036 process_encrypted_neighbour_queue (n);
2041 * We received a SET_KEY message. Validate and update
2042 * our key material and status.
2044 * @param n the neighbour from which we received message m
2045 * @param m the set key message we received
2048 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
2050 struct SetKeyMessage *m_cpy;
2051 struct GNUNET_TIME_Absolute t;
2052 struct GNUNET_CRYPTO_AesSessionKey k;
2053 struct PingMessage *ping;
2054 enum PeerStateMachine sender_status;
2056 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2057 "Core service receives `%s' request from `%4s'.\n",
2058 "SET_KEY", GNUNET_i2s (&n->peer));
2059 if (n->public_key == NULL)
2061 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2062 "Lacking public key for peer, trying to obtain one.\n");
2063 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
2064 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
2065 /* lookup n's public key, then try again */
2066 GNUNET_PEERINFO_for_all (cfg,
2070 GNUNET_TIME_UNIT_MINUTES,
2071 &process_hello_retry_handle_set_key, m_cpy);
2074 if ((ntohl (m->purpose.size) !=
2075 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2076 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2077 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2078 sizeof (struct GNUNET_PeerIdentity)) ||
2080 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
2081 &m->purpose, &m->signature, n->public_key)))
2083 /* invalid signature */
2084 GNUNET_break_op (0);
2087 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
2088 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
2089 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
2090 (t.value < n->decrypt_key_created.value))
2092 /* this could rarely happen due to massive re-ordering of
2093 messages on the network level, but is most likely either
2094 a bug or some adversary messing with us. Report. */
2095 GNUNET_break_op (0);
2098 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Decrypting key material.\n");
2099 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
2102 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
2103 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
2104 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
2106 /* failed to decrypt !? */
2107 GNUNET_break_op (0);
2112 if (n->decrypt_key_created.value != t.value)
2114 /* fresh key, reset sequence numbers */
2115 n->last_sequence_number_received = 0;
2116 n->last_packets_bitmap = 0;
2117 n->decrypt_key_created = t;
2119 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
2122 case PEER_STATE_DOWN:
2123 n->status = PEER_STATE_KEY_RECEIVED;
2124 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2125 "Responding to `%s' with my own key.\n", "SET_KEY");
2128 case PEER_STATE_KEY_SENT:
2129 case PEER_STATE_KEY_RECEIVED:
2130 n->status = PEER_STATE_KEY_RECEIVED;
2131 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
2132 (sender_status != PEER_STATE_KEY_CONFIRMED))
2134 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2135 "Responding to `%s' with my own key (other peer has status %u).\n",
2136 "SET_KEY", sender_status);
2140 case PEER_STATE_KEY_CONFIRMED:
2141 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
2142 (sender_status != PEER_STATE_KEY_CONFIRMED))
2144 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2145 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
2146 "SET_KEY", sender_status);
2154 if (n->pending_ping != NULL)
2156 ping = n->pending_ping;
2157 n->pending_ping = NULL;
2158 handle_ping (n, ping);
2165 * We received a PONG message. Validate and update
2168 * @param n sender of the PONG
2169 * @param m the encrypted PONG message itself
2172 handle_pong (struct Neighbour *n, const struct PingMessage *m)
2174 struct PingMessage t;
2176 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2177 "Core service receives `%s' request from `%4s'.\n",
2178 "PONG", GNUNET_i2s (&n->peer));
2181 &n->peer.hashPubKey,
2184 sizeof (struct PingMessage) -
2185 sizeof (struct GNUNET_MessageHeader)))
2187 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2188 "Decrypted `%s' from `%4s' with challenge %u using key %u\n",
2190 GNUNET_i2s (&t.target),
2191 ntohl (t.challenge), n->decrypt_key.crc32);
2192 if ((0 != memcmp (&t.target,
2194 sizeof (struct GNUNET_PeerIdentity))) ||
2195 (n->ping_challenge != ntohl (t.challenge)))
2197 /* PONG malformed */
2198 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2199 "Received malfromed `%s' wanted sender `%4s' with challenge %u\n",
2200 "PONG", GNUNET_i2s (&n->peer), n->ping_challenge);
2201 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2202 "Received malfromed `%s' received from `%4s' with challenge %u\n",
2203 "PONG", GNUNET_i2s (&t.target), ntohl (t.challenge));
2204 GNUNET_break_op (0);
2209 case PEER_STATE_DOWN:
2210 GNUNET_break (0); /* should be impossible */
2212 case PEER_STATE_KEY_SENT:
2213 GNUNET_break (0); /* should be impossible, how did we decrypt? */
2215 case PEER_STATE_KEY_RECEIVED:
2216 n->status = PEER_STATE_KEY_CONFIRMED;
2217 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_PREREQUISITE_TASK)
2219 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2220 n->retry_set_key_task = GNUNET_SCHEDULER_NO_PREREQUISITE_TASK;
2222 process_encrypted_neighbour_queue (n);
2224 case PEER_STATE_KEY_CONFIRMED:
2225 /* duplicate PONG? */
2235 * Send a P2P message to a client.
2237 * @param sender who sent us the message?
2238 * @param client who should we give the message to?
2239 * @param m contains the message to transmit
2240 * @param msize number of bytes in buf to transmit
2243 send_p2p_message_to_client (struct Neighbour *sender,
2244 struct Client *client,
2245 const void *m, size_t msize)
2247 char buf[msize + sizeof (struct NotifyTrafficMessage)];
2248 struct NotifyTrafficMessage *ntm;
2250 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2251 "Core service passes P2P message of type %u to client.\n",
2252 ntohs (((const struct GNUNET_MessageHeader *) m)->type));
2253 ntm = (struct NotifyTrafficMessage *) buf;
2254 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
2255 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
2256 ntm->reserved = htonl (0);
2257 ntm->peer = sender->peer;
2258 memcpy (&ntm[1], m, msize);
2259 send_to_client (client, &ntm->header, GNUNET_YES);
2264 * Deliver P2P message to interested clients.
2266 * @param sender who sent us the message?
2267 * @param m the message
2268 * @param msize size of the message (including header)
2271 deliver_message (struct Neighbour *sender,
2272 const struct GNUNET_MessageHeader *m, size_t msize)
2274 struct Client *cpos;
2279 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2280 "Passing decrypted P2P message to interested clients.\n");
2281 type = ntohs (m->type);
2283 while (cpos != NULL)
2285 deliver_full = GNUNET_NO;
2286 if (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND)
2287 deliver_full = GNUNET_YES;
2290 for (tpos = 0; tpos < cpos->tcnt; tpos++)
2292 if (type != cpos->types[tpos])
2294 deliver_full = GNUNET_YES;
2298 if (GNUNET_YES == deliver_full)
2299 send_p2p_message_to_client (sender, cpos, m, msize);
2300 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
2301 send_p2p_message_to_client (sender, cpos, m,
2302 sizeof (struct GNUNET_MessageHeader));
2309 * Align P2P message and then deliver to interested clients.
2311 * @param sender who sent us the message?
2312 * @param buffer unaligned (!) buffer containing message
2313 * @param msize size of the message (including header)
2316 align_and_deliver (struct Neighbour *sender, const char *buffer, size_t msize)
2320 /* TODO: call to statistics? */
2321 memcpy (abuf, buffer, msize);
2322 deliver_message (sender, (const struct GNUNET_MessageHeader *) abuf, msize);
2327 * Deliver P2P messages to interested clients.
2329 * @param sender who sent us the message?
2330 * @param buffer buffer containing messages, can be modified
2331 * @param buffer_size size of the buffer (overall)
2332 * @param offset offset where messages in the buffer start
2335 deliver_messages (struct Neighbour *sender,
2336 const char *buffer, size_t buffer_size, size_t offset)
2338 struct GNUNET_MessageHeader *mhp;
2339 struct GNUNET_MessageHeader mh;
2343 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2344 "Delivering %u bytes of plaintext to interested clients.\n",
2346 while (offset + sizeof (struct GNUNET_MessageHeader) <= buffer_size)
2348 if (0 != offset % sizeof (uint16_t))
2350 /* outch, need to copy to access header */
2351 memcpy (&mh, &buffer[offset], sizeof (struct GNUNET_MessageHeader));
2356 /* can access header directly */
2357 mhp = (struct GNUNET_MessageHeader *) &buffer[offset];
2359 msize = ntohs (mhp->size);
2360 if (msize + offset > buffer_size)
2362 /* malformed message, header says it is larger than what
2363 would fit into the overall buffer */
2364 GNUNET_break_op (0);
2367 #if HAVE_UNALIGNED_64_ACCESS
2368 need_align = (0 != offset % 4) ? GNUNET_YES : GNUNET_NO;
2370 need_align = (0 != offset % 8) ? GNUNET_YES : GNUNET_NO;
2372 if (GNUNET_YES == need_align)
2373 align_and_deliver (sender, &buffer[offset], msize);
2375 deliver_message (sender,
2376 (const struct GNUNET_MessageHeader *)
2377 &buffer[offset], msize);
2384 * We received an encrypted message. Decrypt, validate and
2385 * pass on to the appropriate clients.
2388 handle_encrypted_message (struct Neighbour *n,
2389 const struct EncryptedMessage *m)
2391 size_t size = ntohs (m->header.size);
2393 struct EncryptedMessage *pt; /* plaintext */
2397 struct GNUNET_TIME_Absolute t;
2399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2400 "Core service receives `%s' request from `%4s'.\n",
2401 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
2406 &m->sequence_number,
2407 &buf[ENCRYPTED_HEADER_SIZE], size - ENCRYPTED_HEADER_SIZE))
2409 pt = (struct EncryptedMessage *) buf;
2412 GNUNET_CRYPTO_hash (&pt->sequence_number,
2413 size - ENCRYPTED_HEADER_SIZE, &ph);
2414 if (0 != memcmp (&ph, &m->plaintext_hash, sizeof (GNUNET_HashCode)))
2416 /* checksum failed */
2417 GNUNET_break_op (0);
2421 /* validate sequence number */
2422 snum = ntohl (pt->sequence_number);
2423 if (n->last_sequence_number_received == snum)
2425 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2426 "Received duplicate message, ignoring.\n");
2427 /* duplicate, ignore */
2430 if ((n->last_sequence_number_received > snum) &&
2431 (n->last_sequence_number_received - snum > 32))
2433 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2434 "Received ancient out of sequence message, ignoring.\n");
2435 /* ancient out of sequence, ignore */
2438 if (n->last_sequence_number_received > snum)
2440 unsigned int rotbit =
2441 1 << (n->last_sequence_number_received - snum - 1);
2442 if ((n->last_packets_bitmap & rotbit) != 0)
2444 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2445 "Received duplicate message, ignoring.\n");
2446 /* duplicate, ignore */
2449 n->last_packets_bitmap |= rotbit;
2451 if (n->last_sequence_number_received < snum)
2453 n->last_packets_bitmap <<= (snum - n->last_sequence_number_received);
2454 n->last_sequence_number_received = snum;
2457 /* check timestamp */
2458 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
2459 if (GNUNET_TIME_absolute_get_duration (t).value > MAX_MESSAGE_AGE.value)
2461 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2463 ("Message received far too old (%llu ms). Content ignored.\n"),
2464 GNUNET_TIME_absolute_get_duration (t).value);
2468 /* process decrypted message(s) */
2469 n->bpm_out_external_limit = ntohl (pt->inbound_bpm_limit);
2470 n->bpm_out = GNUNET_MAX (n->bpm_out_external_limit,
2471 n->bpm_out_internal_limit);
2472 n->last_activity = GNUNET_TIME_absolute_get ();
2473 off = sizeof (struct EncryptedMessage);
2474 deliver_messages (n, buf, size, off);
2479 * Function called by the transport for each received message.
2481 * @param cls closure
2482 * @param latency estimated latency for communicating with the
2484 * @param peer (claimed) identity of the other peer
2485 * @param message the message
2488 handle_transport_receive (void *cls,
2489 struct GNUNET_TIME_Relative latency,
2490 const struct GNUNET_PeerIdentity *peer,
2491 const struct GNUNET_MessageHeader *message)
2493 struct Neighbour *n;
2494 struct GNUNET_TIME_Absolute now;
2499 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2500 "Received message of type %u from `%4s', demultiplexing.\n",
2501 ntohs (message->type), GNUNET_i2s (peer));
2502 n = find_neighbour (peer);
2508 n->last_latency = latency;
2509 up = n->status == PEER_STATE_KEY_CONFIRMED;
2510 type = ntohs (message->type);
2511 size = ntohs (message->size);
2514 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
2515 if (size != sizeof (struct SetKeyMessage))
2517 GNUNET_break_op (0);
2520 handle_set_key (n, (const struct SetKeyMessage *) message);
2522 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
2523 if (size < sizeof (struct EncryptedMessage) +
2524 sizeof (struct GNUNET_MessageHeader))
2526 GNUNET_break_op (0);
2529 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
2530 (n->status != PEER_STATE_KEY_CONFIRMED))
2532 GNUNET_break_op (0);
2535 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
2537 case GNUNET_MESSAGE_TYPE_CORE_PING:
2538 if (size != sizeof (struct PingMessage))
2540 GNUNET_break_op (0);
2543 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
2544 (n->status != PEER_STATE_KEY_CONFIRMED))
2546 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2547 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
2548 "PING", GNUNET_i2s (&n->peer));
2549 GNUNET_free_non_null (n->pending_ping);
2550 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
2551 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
2554 handle_ping (n, (const struct PingMessage *) message);
2556 case GNUNET_MESSAGE_TYPE_CORE_PONG:
2557 if (size != sizeof (struct PingMessage))
2559 GNUNET_break_op (0);
2562 if ((n->status != PEER_STATE_KEY_SENT) &&
2563 (n->status != PEER_STATE_KEY_RECEIVED) &&
2564 (n->status != PEER_STATE_KEY_CONFIRMED))
2566 /* could not decrypt pong, oops! */
2567 GNUNET_break_op (0);
2570 handle_pong (n, (const struct PingMessage *) message);
2573 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2574 _("Unsupported message of type %u received.\n"), type);
2577 if (n->status == PEER_STATE_KEY_CONFIRMED)
2579 now = GNUNET_TIME_absolute_get ();
2580 n->last_activity = now;
2582 n->time_established = now;
2588 * Function called by transport to notify us that
2589 * a peer connected to us (on the network level).
2591 * @param cls closure
2592 * @param peer the peer that connected
2593 * @param latency current latency of the connection
2596 handle_transport_notify_connect (void *cls,
2597 const struct GNUNET_PeerIdentity *peer,
2598 struct GNUNET_TIME_Relative latency)
2600 struct Neighbour *n;
2601 struct GNUNET_TIME_Absolute now;
2602 struct ConnectNotifyMessage cnm;
2604 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2605 "Received connection from `%4s'.\n", GNUNET_i2s (peer));
2606 n = find_neighbour (peer);
2609 /* duplicate connect notification!? */
2613 now = GNUNET_TIME_absolute_get ();
2614 n = GNUNET_malloc (sizeof (struct Neighbour));
2615 n->next = neighbours;
2618 n->last_latency = latency;
2619 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
2620 n->encrypt_key_created = now;
2621 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
2622 n->last_asw_update = now;
2623 n->last_arw_update = now;
2624 n->bpm_in = DEFAULT_BPM_IN_OUT;
2625 n->bpm_out = DEFAULT_BPM_IN_OUT;
2626 n->bpm_out_internal_limit = (uint32_t) - 1;
2627 n->bpm_out_external_limit = DEFAULT_BPM_IN_OUT;
2628 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
2630 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2631 "Created entry for new neighbour `%4s'.\n",
2632 GNUNET_i2s (&n->peer));
2633 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
2634 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
2635 cnm.bpm_available = htonl (DEFAULT_BPM_IN_OUT);
2637 cnm.last_activity = GNUNET_TIME_absolute_hton (now);
2638 send_to_all_clients (&cnm.header, GNUNET_YES);
2643 * Free the given entry for the neighbour (it has
2644 * already been removed from the list at this point).
2645 * @param n neighbour to free
2648 free_neighbour (struct Neighbour *n)
2650 struct MessageEntry *m;
2652 while (NULL != (m = n->messages))
2654 n->messages = m->next;
2657 while (NULL != (m = n->encrypted_head))
2659 n->encrypted_head = m->next;
2663 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
2664 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_PREREQUISITE_TASK)
2665 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
2666 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_PREREQUISITE_TASK)
2667 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2668 GNUNET_free_non_null (n->public_key);
2669 GNUNET_free_non_null (n->pending_ping);
2675 * Function called by transport telling us that a peer
2678 * @param cls closure
2679 * @param peer the peer that disconnected
2682 handle_transport_notify_disconnect (void *cls,
2683 const struct GNUNET_PeerIdentity *peer)
2685 struct ConnectNotifyMessage cnm;
2686 struct Neighbour *n;
2687 struct Neighbour *p;
2689 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2690 "Peer `%4s' disconnected from us.\n", GNUNET_i2s (peer));
2693 while ((n != NULL) &&
2694 (0 != memcmp (&n->peer, peer, sizeof (struct GNUNET_PeerIdentity))))
2705 neighbours = n->next;
2708 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
2709 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
2710 cnm.bpm_available = htonl (0);
2712 cnm.last_activity = GNUNET_TIME_absolute_hton (n->last_activity);
2713 send_to_all_clients (&cnm.header, GNUNET_YES);
2719 * Last task run during shutdown. Disconnects us from
2723 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2725 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core service shutting down.\n");
2726 GNUNET_assert (transport != NULL);
2727 GNUNET_TRANSPORT_disconnect (transport);
2733 * Initiate core service.
2735 * @param cls closure
2736 * @param s scheduler to use
2737 * @param serv the initialized server
2738 * @param c configuration to use
2742 struct GNUNET_SCHEDULER_Handle *s,
2743 struct GNUNET_SERVER_Handle *serv, struct GNUNET_CONFIGURATION_Handle *c)
2746 unsigned long long qin;
2747 unsigned long long qout;
2748 unsigned long long tneigh;
2754 /* parse configuration */
2758 GNUNET_CONFIGURATION_get_value_number (c,
2763 GNUNET_CONFIGURATION_get_value_number (c,
2768 GNUNET_CONFIGURATION_get_value_number (c,
2770 "ZZ_LIMIT", &tneigh)) ||
2773 GNUNET_CONFIGURATION_get_value_filename (c,
2775 "HOSTKEY", &keyfile)))
2777 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2779 ("Core service is lacking key configuration settings. Exiting.\n"));
2780 GNUNET_SCHEDULER_shutdown (s);
2783 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
2784 GNUNET_free (keyfile);
2785 if (my_private_key == NULL)
2787 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2788 _("Core service could not access hostkey. Exiting.\n"));
2789 GNUNET_SCHEDULER_shutdown (s);
2792 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
2793 GNUNET_CRYPTO_hash (&my_public_key,
2794 sizeof (my_public_key), &my_identity.hashPubKey);
2795 /* setup notification */
2797 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
2798 /* setup transport connection */
2799 transport = GNUNET_TRANSPORT_connect (sched,
2802 &handle_transport_receive,
2803 &handle_transport_notify_connect,
2804 &handle_transport_notify_disconnect);
2805 GNUNET_assert (NULL != transport);
2806 GNUNET_SCHEDULER_add_delayed (sched,
2808 GNUNET_SCHEDULER_PRIORITY_IDLE,
2809 GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
2810 GNUNET_TIME_UNIT_FOREVER_REL,
2811 &cleaning_task, NULL);
2812 /* process client requests */
2813 GNUNET_SERVER_add_handlers (server, handlers);
2814 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2815 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
2820 * Function called during shutdown. Clean up our state.
2823 cleanup (void *cls, struct GNUNET_CONFIGURATION_Handle *cfg)
2825 struct Neighbour *n;
2827 if (my_private_key != NULL)
2828 GNUNET_CRYPTO_rsa_key_free (my_private_key);
2829 while (NULL != (n = neighbours))
2831 neighbours = n->next;
2842 * The main function for the transport service.
2844 * @param argc number of arguments from the command line
2845 * @param argv command line arguments
2846 * @return 0 ok, 1 on error
2849 main (int argc, char *const *argv)
2851 return (GNUNET_OK ==
2852 GNUNET_SERVICE_run (argc,
2854 "core", &run, NULL, &cleanup, NULL)) ? 0 : 1;
2857 /* end of gnunet-service-core.c */