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
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file core/gnunet-service-core.c
23 * @brief high-level P2P messaging
24 * @author Christian Grothoff
26 * Considerations for later:
27 * - check that hostkey used by transport (for HELLOs) is the
28 * same as the hostkey that we are using!
29 * - add code to send PINGs if we are about to time-out otherwise
30 * - optimize lookup (many O(n) list traversals
31 * could ideally be changed to O(1) hash map lookups)
34 #include "gnunet_constants.h"
35 #include "gnunet_util_lib.h"
36 #include "gnunet_hello_lib.h"
37 #include "gnunet_peerinfo_service.h"
38 #include "gnunet_protocols.h"
39 #include "gnunet_signatures.h"
40 #include "gnunet_transport_service.h"
44 #define DEBUG_HANDSHAKE GNUNET_NO
47 * Receive and send buffer windows grow over time. For
48 * how long can 'unused' bandwidth accumulate before we
49 * need to cap it? (specified in ms).
51 #define MAX_WINDOW_TIME (5 * 60 * 1000)
54 * How many messages do we queue up at most for optional
55 * notifications to a client? (this can cause notifications
56 * about outgoing messages to be dropped).
58 #define MAX_NOTIFY_QUEUE 16
61 * Minimum of bytes per minute (out) to assign to any connected peer.
62 * Should be rather low; values larger than DEFAULT_BPM_IN_OUT make no
65 #define MIN_BPM_PER_PEER GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT
68 * What is the smallest change (in number of bytes per minute)
69 * that we consider significant enough to bother triggering?
71 #define MIN_BPM_CHANGE 32
74 * After how much time past the "official" expiration time do
75 * we discard messages? Should not be zero since we may
76 * intentionally defer transmission until close to the deadline
77 * and then may be slightly past the deadline due to inaccuracy
78 * in sleep and our own CPU consumption.
80 #define PAST_EXPIRATION_DISCARD_TIME GNUNET_TIME_UNIT_SECONDS
83 * What is the maximum delay for a SET_KEY message?
85 #define MAX_SET_KEY_DELAY GNUNET_TIME_UNIT_SECONDS
88 * What how long do we wait for SET_KEY confirmation initially?
90 #define INITIAL_SET_KEY_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 3)
93 * What is the maximum delay for a PING message?
95 #define MAX_PING_DELAY GNUNET_TIME_UNIT_SECONDS
98 * What is the maximum delay for a PONG message?
100 #define MAX_PONG_DELAY GNUNET_TIME_UNIT_SECONDS
103 * How often do we recalculate bandwidth quotas?
105 #define QUOTA_UPDATE_FREQUENCY GNUNET_TIME_UNIT_SECONDS
108 * What is the priority for a SET_KEY message?
110 #define SET_KEY_PRIORITY 0xFFFFFF
113 * What is the priority for a PING message?
115 #define PING_PRIORITY 0xFFFFFF
118 * What is the priority for a PONG message?
120 #define PONG_PRIORITY 0xFFFFFF
123 * How many messages do we queue per peer at most?
125 #define MAX_PEER_QUEUE_SIZE 16
128 * How many non-mandatory messages do we queue per client at most?
130 #define MAX_CLIENT_QUEUE_SIZE 32
133 * What is the maximum age of a message for us to consider
134 * processing it? Note that this looks at the timestamp used
135 * by the other peer, so clock skew between machines does
136 * come into play here. So this should be picked high enough
137 * so that a little bit of clock skew does not prevent peers
138 * from connecting to us.
140 #define MAX_MESSAGE_AGE GNUNET_TIME_UNIT_DAYS
143 * What is the maximum size for encrypted messages? Note that this
144 * number imposes a clear limit on the maximum size of any message.
145 * Set to a value close to 64k but not so close that transports will
146 * have trouble with their headers.
148 #define MAX_ENCRYPTED_MESSAGE_SIZE (63 * 1024)
152 * State machine for our P2P encryption handshake. Everyone starts in
153 * "DOWN", if we receive the other peer's key (other peer initiated)
154 * we start in state RECEIVED (since we will immediately send our
155 * own); otherwise we start in SENT. If we get back a PONG from
156 * within either state, we move up to CONFIRMED (the PONG will always
157 * be sent back encrypted with the key we sent to the other peer).
159 enum PeerStateMachine
163 PEER_STATE_KEY_RECEIVED,
164 PEER_STATE_KEY_CONFIRMED
169 * Number of bytes (at the beginning) of "struct EncryptedMessage"
170 * that are NOT encrypted.
172 #define ENCRYPTED_HEADER_SIZE (sizeof(struct GNUNET_MessageHeader) + sizeof(uint32_t) + sizeof(GNUNET_HashCode))
176 * Encapsulation for encrypted messages exchanged between
177 * peers. Followed by the actual encrypted data.
179 struct EncryptedMessage
182 * Message type is either CORE_ENCRYPTED_MESSAGE.
184 struct GNUNET_MessageHeader header;
189 uint32_t reserved GNUNET_PACKED;
192 * Hash of the plaintext, used to verify message integrity;
193 * ALSO used as the IV for the symmetric cipher! Everything
194 * after this hash will be encrypted. ENCRYPTED_HEADER_SIZE
195 * must be set to the offset of the next field.
197 GNUNET_HashCode plaintext_hash;
200 * Sequence number, in network byte order. This field
201 * must be the first encrypted/decrypted field and the
202 * first byte that is hashed for the plaintext hash.
204 uint32_t sequence_number GNUNET_PACKED;
207 * Desired bandwidth (how much we should send to this
208 * peer / how much is the sender willing to receive),
209 * in bytes per minute.
211 uint32_t inbound_bpm_limit GNUNET_PACKED;
214 * Timestamp. Used to prevent reply of ancient messages
215 * (recent messages are caught with the sequence number).
217 struct GNUNET_TIME_AbsoluteNBO timestamp;
222 * We're sending an (encrypted) PING to the other peer to check if he
223 * can decrypt. The other peer should respond with a PONG with the
224 * same content, except this time encrypted with the receiver's key.
229 * Message type is either CORE_PING or CORE_PONG.
231 struct GNUNET_MessageHeader header;
234 * Random number chosen to make reply harder.
236 uint32_t challenge GNUNET_PACKED;
239 * Intended target of the PING, used primarily to check
240 * that decryption actually worked.
242 struct GNUNET_PeerIdentity target;
247 * Message transmitted to set (or update) a session key.
253 * Message type is either CORE_SET_KEY.
255 struct GNUNET_MessageHeader header;
258 * Status of the sender (should be in "enum PeerStateMachine"), nbo.
260 int32_t sender_status GNUNET_PACKED;
263 * Purpose of the signature, will be
264 * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
266 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
269 * At what time was this key created?
271 struct GNUNET_TIME_AbsoluteNBO creation_time;
274 * The encrypted session key.
276 struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
279 * Who is the intended recipient?
281 struct GNUNET_PeerIdentity target;
284 * Signature of the stuff above (starting at purpose).
286 struct GNUNET_CRYPTO_RsaSignature signature;
292 * Message waiting for transmission. This struct
293 * is followed by the actual content of the message.
299 * We keep messages in a doubly linked list.
301 struct MessageEntry *next;
304 * We keep messages in a doubly linked list.
306 struct MessageEntry *prev;
309 * By when are we supposed to transmit this message?
311 struct GNUNET_TIME_Absolute deadline;
314 * How important is this message to us?
316 unsigned int priority;
319 * How long is the message? (number of bytes following
320 * the "struct MessageEntry", but not including the
321 * size of "struct MessageEntry" itself!)
326 * Was this message selected for transmission in the
327 * current round? GNUNET_YES or GNUNET_NO.
332 * Did we give this message some slack (delayed sending) previously
333 * (and hence should not give it any more slack)? GNUNET_YES or
344 * We keep neighbours in a linked list (for now).
346 struct Neighbour *next;
349 * Unencrypted messages destined for this peer.
351 struct MessageEntry *messages;
354 * Head of the batched, encrypted message queue (already ordered,
355 * transmit starting with the head).
357 struct MessageEntry *encrypted_head;
360 * Tail of the batched, encrypted message queue (already ordered,
361 * append new messages to tail)
363 struct MessageEntry *encrypted_tail;
366 * Handle for pending requests for transmission to this peer
367 * with the transport service. NULL if no request is pending.
369 struct GNUNET_TRANSPORT_TransmitHandle *th;
372 * Public key of the neighbour, NULL if we don't have it yet.
374 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
377 * We received a PING message before we got the "public_key"
378 * (or the SET_KEY). We keep it here until we have a key
379 * to decrypt it. NULL if no PING is pending.
381 struct PingMessage *pending_ping;
384 * We received a PONG message before we got the "public_key"
385 * (or the SET_KEY). We keep it here until we have a key
386 * to decrypt it. NULL if no PONG is pending.
388 struct PingMessage *pending_pong;
391 * Non-NULL if we are currently looking up HELLOs for this peer.
394 struct GNUNET_PEERINFO_IteratorContext *pitr;
397 * SetKeyMessage to transmit, NULL if we are not currently trying
400 struct SetKeyMessage *skm;
403 * Identity of the neighbour.
405 struct GNUNET_PeerIdentity peer;
408 * Key we use to encrypt our messages for the other peer
409 * (initialized by us when we do the handshake).
411 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
414 * Key we use to decrypt messages from the other peer
415 * (given to us by the other peer during the handshake).
417 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
420 * ID of task used for re-trying plaintext scheduling.
422 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
425 * ID of task used for re-trying SET_KEY and PING message.
427 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
430 * ID of task used for updating bandwidth quota for this neighbour.
432 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
435 * ID of task used for cleaning up dead neighbour entries.
437 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
440 * At what time did we generate our encryption key?
442 struct GNUNET_TIME_Absolute encrypt_key_created;
445 * At what time did the other peer generate the decryption key?
447 struct GNUNET_TIME_Absolute decrypt_key_created;
450 * At what time did we initially establish (as in, complete session
451 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
453 struct GNUNET_TIME_Absolute time_established;
456 * At what time did we last receive an encrypted message from the
457 * other peer? Should be zero if status != KEY_CONFIRMED.
459 struct GNUNET_TIME_Absolute last_activity;
462 * Last latency observed from this peer.
464 struct GNUNET_TIME_Relative last_latency;
467 * At what frequency are we currently re-trying SET_KEY messages?
469 struct GNUNET_TIME_Relative set_key_retry_frequency;
472 * Time of our last update to the "available_send_window".
474 struct GNUNET_TIME_Absolute last_asw_update;
477 * Time of our last update to the "available_recv_window".
479 struct GNUNET_TIME_Absolute last_arw_update;
482 * Number of bytes that we are eligible to transmit to this
483 * peer at this point. Incremented every minute by max_out_bpm,
484 * bounded by max_bpm (no back-log larger than MAX_BUF_FACT minutes,
485 * bandwidth-hogs are sampled at a frequency of about 78s!);
486 * may get negative if we have VERY high priority content.
488 long long available_send_window;
491 * How much downstream capacity of this peer has been reserved for
492 * our traffic? (Our clients can request that a certain amount of
493 * bandwidth is available for replies to them; this value is used to
494 * make sure that this reserved amount of bandwidth is actually
497 long long available_recv_window;
500 * How valueable were the messages of this peer recently?
502 unsigned long long current_preference;
505 * Bit map indicating which of the 32 sequence numbers before the last
506 * were received (good for accepting out-of-order packets and
507 * estimating reliability of the connection)
509 unsigned int last_packets_bitmap;
512 * last sequence number received on this connection (highest)
514 uint32_t last_sequence_number_received;
517 * last sequence number transmitted
519 uint32_t last_sequence_number_sent;
522 * Available bandwidth in for this peer (current target).
527 * Available bandwidth out for this peer (current target).
532 * Internal bandwidth limit set for this peer (initially
533 * typically set to "-1"). "bpm_out" is MAX of
534 * "bpm_out_internal_limit" and "bpm_out_external_limit".
536 uint32_t bpm_out_internal_limit;
539 * External bandwidth limit set for this peer by the
540 * peer that we are communicating with. "bpm_out" is MAX of
541 * "bpm_out_internal_limit" and "bpm_out_external_limit".
543 uint32_t bpm_out_external_limit;
546 * What was our PING challenge number (for this peer)?
548 uint32_t ping_challenge;
551 * What was the last distance to this peer as reported by the transports?
553 uint32_t last_distance;
556 * What is our connection status?
558 enum PeerStateMachine status;
561 * Are we currently connected to this neighbour?
568 * Data structure for each client connected to the core service.
573 * Clients are kept in a linked list.
578 * Handle for the client with the server API.
580 struct GNUNET_SERVER_Client *client_handle;
583 * Array of the types of messages this peer cares
584 * about (with "tcnt" entries). Allocated as part
585 * of this client struct, do not free!
590 * Options for messages this client cares about,
591 * see GNUNET_CORE_OPTION_ values.
596 * Number of types of incoming messages this client
597 * specifically cares about. Size of the "types" array.
607 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
612 static struct GNUNET_PeerIdentity my_identity;
617 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
622 struct GNUNET_SCHEDULER_Handle *sched;
627 const struct GNUNET_CONFIGURATION_Handle *cfg;
632 static struct GNUNET_SERVER_Handle *server;
637 static struct GNUNET_TRANSPORT_Handle *transport;
640 * Linked list of our clients.
642 static struct Client *clients;
645 * Context for notifications we need to send to our clients.
647 static struct GNUNET_SERVER_NotificationContext *notifier;
650 * We keep neighbours in a linked list (for now).
652 static struct Neighbour *neighbours;
655 * Sum of all preferences among all neighbours.
657 static unsigned long long preference_sum;
660 * Total number of neighbours we have.
662 static unsigned int neighbour_count;
665 * How much inbound bandwidth are we supposed to be using?
667 static unsigned long long bandwidth_target_in;
670 * How much outbound bandwidth are we supposed to be using?
672 static unsigned long long bandwidth_target_out;
677 * A preference value for a neighbour was update. Update
678 * the preference sum accordingly.
680 * @param inc how much was a preference value increased?
683 update_preference_sum (unsigned long long inc)
686 unsigned long long os;
689 preference_sum += inc;
690 if (preference_sum >= os)
692 /* overflow! compensate by cutting all values in half! */
697 n->current_preference /= 2;
698 preference_sum += n->current_preference;
705 * Recalculate the number of bytes we expect to
706 * receive or transmit in a given window.
708 * @param force force an update now (even if not much time has passed)
709 * @param window pointer to the byte counter (updated)
710 * @param ts pointer to the timestamp (updated)
711 * @param bpm number of bytes per minute that should
712 * be added to the window.
715 update_window (int force,
717 struct GNUNET_TIME_Absolute *ts, unsigned int bpm)
719 struct GNUNET_TIME_Relative since;
721 since = GNUNET_TIME_absolute_get_duration (*ts);
722 if ( (force == GNUNET_NO) &&
723 (since.value < 60 * 1000) )
724 return; /* not even a minute has passed */
725 *ts = GNUNET_TIME_absolute_get ();
726 *window += (bpm * since.value) / 60 / 1000;
727 if (*window > MAX_WINDOW_TIME * bpm)
728 *window = MAX_WINDOW_TIME * bpm;
733 * Find the entry for the given neighbour.
735 * @param peer identity of the neighbour
736 * @return NULL if we are not connected, otherwise the
739 static struct Neighbour *
740 find_neighbour (const struct GNUNET_PeerIdentity *peer)
742 struct Neighbour *ret;
745 while ((ret != NULL) &&
746 (0 != memcmp (&ret->peer,
747 peer, sizeof (struct GNUNET_PeerIdentity))))
754 * Send a message to one of our clients.
756 * @param client target for the message
757 * @param msg message to transmit
758 * @param can_drop could this message be dropped if the
759 * client's queue is getting too large?
762 send_to_client (struct Client *client,
763 const struct GNUNET_MessageHeader *msg,
766 #if DEBUG_CORE_CLIENT
767 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
768 "Preparing to send message of type %u to client.\n",
771 GNUNET_SERVER_notification_context_unicast (notifier,
772 client->client_handle,
779 * Send a message to all of our current clients that have
780 * the right options set.
782 * @param msg message to multicast
783 * @param can_drop can this message be discarded if the queue is too long
784 * @param options mask to use
787 send_to_all_clients (const struct GNUNET_MessageHeader *msg,
796 if (0 != (c->options & options))
797 send_to_client (c, msg, can_drop);
804 * Handle CORE_INIT request.
807 handle_client_init (void *cls,
808 struct GNUNET_SERVER_Client *client,
809 const struct GNUNET_MessageHeader *message)
811 const struct InitMessage *im;
812 struct InitReplyMessage irm;
815 const uint16_t *types;
817 struct ConnectNotifyMessage cnm;
819 #if DEBUG_CORE_CLIENT
820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
821 "Client connecting to core service with `%s' message\n",
824 /* check that we don't have an entry already */
828 if (client == c->client_handle)
831 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
836 msize = ntohs (message->size);
837 if (msize < sizeof (struct InitMessage))
840 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
843 GNUNET_SERVER_notification_context_add (notifier, client);
844 im = (const struct InitMessage *) message;
845 types = (const uint16_t *) &im[1];
846 msize -= sizeof (struct InitMessage);
847 c = GNUNET_malloc (sizeof (struct Client) + msize);
848 c->client_handle = client;
851 memcpy (&c[1], types, msize);
852 c->types = (uint16_t *) & c[1];
853 c->options = ntohl (im->options);
854 c->tcnt = msize / sizeof (uint16_t);
855 /* send init reply message */
856 irm.header.size = htons (sizeof (struct InitReplyMessage));
857 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
858 irm.reserved = htonl (0);
859 memcpy (&irm.publicKey,
861 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
862 #if DEBUG_CORE_CLIENT
863 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
864 "Sending `%s' message to client.\n", "INIT_REPLY");
866 send_to_client (c, &irm.header, GNUNET_NO);
867 /* notify new client about existing neighbours */
868 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
869 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
873 if (n->status == PEER_STATE_KEY_CONFIRMED)
875 #if DEBUG_CORE_CLIENT
876 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
877 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
879 cnm.distance = htonl (n->last_distance);
880 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
882 send_to_client (c, &cnm.header, GNUNET_NO);
886 GNUNET_SERVER_receive_done (client, GNUNET_OK);
891 * A client disconnected, clean up.
894 * @param client identification of the client
897 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
904 #if DEBUG_CORE_CLIENT
905 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
906 "Client has disconnected from core service.\n");
912 if (client == pos->client_handle)
917 prev->next = pos->next;
924 /* client never sent INIT */
929 * Handle REQUEST_INFO request.
932 handle_client_request_info (void *cls,
933 struct GNUNET_SERVER_Client *client,
934 const struct GNUNET_MessageHeader *message)
936 const struct RequestInfoMessage *rcm;
938 struct ConfigurationInfoMessage cim;
940 unsigned long long old_preference;
941 struct GNUNET_SERVER_TransmitContext *tc;
943 #if DEBUG_CORE_CLIENT
944 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
945 "Core service receives `%s' request.\n", "REQUEST_INFO");
947 rcm = (const struct RequestInfoMessage *) message;
948 n = find_neighbour (&rcm->peer);
949 memset (&cim, 0, sizeof (cim));
952 update_window (GNUNET_YES,
953 &n->available_send_window,
956 n->bpm_out_internal_limit = ntohl (rcm->limit_outbound_bpm);
957 n->bpm_out = GNUNET_MAX (n->bpm_out_internal_limit,
958 n->bpm_out_external_limit);
959 reserv = ntohl (rcm->reserve_inbound);
962 n->available_recv_window += reserv;
966 update_window (GNUNET_NO,
967 &n->available_recv_window,
968 &n->last_arw_update, n->bpm_in);
969 if (n->available_recv_window < reserv)
970 reserv = n->available_recv_window;
971 n->available_recv_window -= reserv;
973 old_preference = n->current_preference;
974 n->current_preference += GNUNET_ntohll(rcm->preference_change);
975 if (old_preference > n->current_preference)
977 /* overflow; cap at maximum value */
978 n->current_preference = (unsigned long long) -1;
980 update_preference_sum (n->current_preference - old_preference);
981 cim.reserved_amount = htonl (reserv);
982 cim.bpm_in = htonl (n->bpm_in);
983 cim.bpm_out = htonl (n->bpm_out);
984 cim.preference = n->current_preference;
986 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
987 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
988 cim.peer = rcm->peer;
990 #if DEBUG_CORE_CLIENT
991 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
992 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
994 tc = GNUNET_SERVER_transmit_context_create (client);
995 GNUNET_SERVER_transmit_context_append_message (tc, &cim.header);
996 GNUNET_SERVER_transmit_context_run (tc,
997 GNUNET_TIME_UNIT_FOREVER_REL);
1002 * Free the given entry for the neighbour (it has
1003 * already been removed from the list at this point).
1005 * @param n neighbour to free
1008 free_neighbour (struct Neighbour *n)
1010 struct MessageEntry *m;
1012 if (n->pitr != NULL)
1014 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1019 GNUNET_free (n->skm);
1022 while (NULL != (m = n->messages))
1024 n->messages = m->next;
1027 while (NULL != (m = n->encrypted_head))
1029 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1036 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1039 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1040 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1041 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1042 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
1043 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1044 GNUNET_SCHEDULER_cancel (sched, n->quota_update_task);
1045 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1046 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1047 GNUNET_free_non_null (n->public_key);
1048 GNUNET_free_non_null (n->pending_ping);
1049 GNUNET_free_non_null (n->pending_pong);
1055 * Consider freeing the given neighbour since we may not need
1056 * to keep it around anymore.
1058 * @param n neighbour to consider discarding
1061 consider_free_neighbour (struct Neighbour *n);
1065 * Task triggered when a neighbour entry might have gotten stale.
1067 * @param cls the 'struct Neighbour'
1068 * @param tc scheduler context (not used)
1071 consider_free_task (void *cls,
1072 const struct GNUNET_SCHEDULER_TaskContext *tc)
1074 struct Neighbour *n = cls;
1075 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1076 consider_free_neighbour (n);
1081 * Consider freeing the given neighbour since we may not need
1082 * to keep it around anymore.
1084 * @param n neighbour to consider discarding
1087 consider_free_neighbour (struct Neighbour *n)
1089 struct Neighbour *pos;
1090 struct Neighbour *prev;
1091 struct GNUNET_TIME_Relative left;
1093 if ( (n->th != NULL) ||
1094 (n->pitr != NULL) ||
1095 (n->status == PEER_STATE_KEY_CONFIRMED) ||
1096 (GNUNET_YES == n->is_connected) )
1097 return; /* no chance */
1099 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1103 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1104 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1105 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
1107 &consider_free_task,
1111 /* actually free the neighbour... */
1120 neighbours = n->next;
1122 prev->next = n->next;
1123 GNUNET_assert (neighbour_count > 0);
1130 * Check if we have encrypted messages for the specified neighbour
1131 * pending, and if so, check with the transport about sending them
1134 * @param n neighbour to check.
1136 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1140 * Function called when the transport service is ready to
1141 * receive an encrypted message for the respective peer
1143 * @param cls neighbour to use message from
1144 * @param size number of bytes we can transmit
1145 * @param buf where to copy the message
1146 * @return number of bytes transmitted
1149 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1151 struct Neighbour *n = cls;
1152 struct MessageEntry *m;
1157 GNUNET_assert (NULL != (m = n->encrypted_head));
1158 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1165 GNUNET_assert (size >= m->size);
1166 memcpy (cbuf, &m[1], m->size);
1168 n->available_send_window -= m->size;
1169 process_encrypted_neighbour_queue (n);
1172 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1173 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1174 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1175 ret, GNUNET_i2s (&n->peer));
1180 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1181 "Transmission of message of type %u and size %u failed\n",
1182 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1186 consider_free_neighbour (n);
1192 * Check if we have plaintext messages for the specified neighbour
1193 * pending, and if so, consider batching and encrypting them (and
1194 * then trigger processing of the encrypted queue if needed).
1196 * @param n neighbour to check.
1198 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1202 * Check if we have encrypted messages for the specified neighbour
1203 * pending, and if so, check with the transport about sending them
1206 * @param n neighbour to check.
1209 process_encrypted_neighbour_queue (struct Neighbour *n)
1211 struct MessageEntry *m;
1214 return; /* request already pending */
1215 m = n->encrypted_head;
1218 /* encrypted queue empty, try plaintext instead */
1219 process_plaintext_neighbour_queue (n);
1223 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1224 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1226 GNUNET_i2s (&n->peer),
1227 GNUNET_TIME_absolute_get_remaining (m->deadline).
1231 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1234 GNUNET_TIME_absolute_get_remaining
1236 ¬ify_encrypted_transmit_ready,
1240 /* message request too large or duplicate request */
1242 /* discard encrypted message */
1243 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1247 process_encrypted_neighbour_queue (n);
1253 * Decrypt size bytes from in and write the result to out. Use the
1254 * key for inbound traffic of the given neighbour. This function does
1255 * NOT do any integrity-checks on the result.
1257 * @param n neighbour we are receiving from
1258 * @param iv initialization vector to use
1259 * @param in ciphertext
1260 * @param out plaintext
1261 * @param size size of in/out
1262 * @return GNUNET_OK on success
1265 do_decrypt (struct Neighbour *n,
1266 const GNUNET_HashCode * iv,
1267 const void *in, void *out, size_t size)
1269 if (size != (uint16_t) size)
1274 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1275 (n->status != PEER_STATE_KEY_CONFIRMED))
1277 GNUNET_break_op (0);
1278 return GNUNET_SYSERR;
1281 GNUNET_CRYPTO_aes_decrypt (in,
1285 GNUNET_CRYPTO_AesInitializationVector *) iv,
1289 return GNUNET_SYSERR;
1292 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1293 "Decrypted %u bytes from `%4s' using key %u\n",
1294 size, GNUNET_i2s (&n->peer), n->decrypt_key.crc32);
1301 * Encrypt size bytes from in and write the result to out. Use the
1302 * key for outbound traffic of the given neighbour.
1304 * @param n neighbour we are sending to
1305 * @param iv initialization vector to use
1306 * @param in ciphertext
1307 * @param out plaintext
1308 * @param size size of in/out
1309 * @return GNUNET_OK on success
1312 do_encrypt (struct Neighbour *n,
1313 const GNUNET_HashCode * iv,
1314 const void *in, void *out, size_t size)
1316 if (size != (uint16_t) size)
1321 GNUNET_assert (size ==
1322 GNUNET_CRYPTO_aes_encrypt (in,
1326 GNUNET_CRYPTO_AesInitializationVector
1329 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1330 "Encrypted %u bytes for `%4s' using key %u\n", size,
1331 GNUNET_i2s (&n->peer), n->encrypt_key.crc32);
1338 * Select messages for transmission. This heuristic uses a combination
1339 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1340 * and priority-based discard (in case no feasible schedule exist) and
1341 * speculative optimization (defer any kind of transmission until
1342 * we either create a batch of significant size, 25% of max, or until
1343 * we are close to a deadline). Furthermore, when scheduling the
1344 * heuristic also packs as many messages into the batch as possible,
1345 * starting with those with the earliest deadline. Yes, this is fun.
1347 * @param n neighbour to select messages from
1348 * @param size number of bytes to select for transmission
1349 * @param retry_time set to the time when we should try again
1350 * (only valid if this function returns zero)
1351 * @return number of bytes selected, or 0 if we decided to
1352 * defer scheduling overall; in that case, retry_time is set.
1355 select_messages (struct Neighbour *n,
1356 size_t size, struct GNUNET_TIME_Relative *retry_time)
1358 struct MessageEntry *pos;
1359 struct MessageEntry *min;
1360 struct MessageEntry *last;
1361 unsigned int min_prio;
1362 struct GNUNET_TIME_Absolute t;
1363 struct GNUNET_TIME_Absolute now;
1366 unsigned long long slack; /* how long could we wait before missing deadlines? */
1368 int discard_low_prio;
1370 GNUNET_assert (NULL != n->messages);
1371 now = GNUNET_TIME_absolute_get ();
1372 /* last entry in linked list of messages processed */
1374 /* should we remove the entry with the lowest
1375 priority from consideration for scheduling at the
1377 discard_low_prio = GNUNET_YES;
1378 while (GNUNET_YES == discard_low_prio)
1382 discard_low_prio = GNUNET_NO;
1383 /* calculate number of bytes available for transmission at time "t" */
1384 update_window (GNUNET_NO,
1385 &n->available_send_window,
1386 &n->last_asw_update,
1388 avail = n->available_send_window;
1389 t = n->last_asw_update;
1390 /* how many bytes have we (hypothetically) scheduled so far */
1392 /* maximum time we can wait before transmitting anything
1393 and still make all of our deadlines */
1397 /* note that we use "*2" here because we want to look
1398 a bit further into the future; much more makes no
1399 sense since new message might be scheduled in the
1401 while ((pos != NULL) && (off < size * 2))
1403 if (pos->do_transmit == GNUNET_YES)
1405 /* already removed from consideration */
1409 if (discard_low_prio == GNUNET_NO)
1411 delta = pos->deadline.value;
1412 if (delta < t.value)
1415 delta = t.value - delta;
1416 avail += delta * n->bpm_out / 1000 / 60;
1417 if (avail < pos->size)
1419 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1424 /* update slack, considering both its absolute deadline
1425 and relative deadlines caused by other messages
1426 with their respective load */
1427 slack = GNUNET_MIN (slack, avail / n->bpm_out);
1428 if ( (pos->deadline.value < now.value) ||
1429 (GNUNET_YES == pos->got_slack) )
1436 GNUNET_MIN (slack, pos->deadline.value - now.value);
1437 pos->got_slack = GNUNET_YES;
1443 t.value = GNUNET_MAX (pos->deadline.value, t.value);
1444 if (pos->priority <= min_prio)
1446 /* update min for discard */
1447 min_prio = pos->priority;
1452 if (discard_low_prio)
1454 GNUNET_assert (min != NULL);
1455 /* remove lowest-priority entry from consideration */
1456 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1460 /* guard against sending "tiny" messages with large headers without
1462 if ( (slack > 1000) && (size > 4 * off) )
1464 /* less than 25% of message would be filled with deadlines still
1465 being met if we delay by one second or more; so just wait for
1466 more data; but do not wait longer than 1s (since we don't want
1467 to delay messages for a really long time either). */
1468 retry_time->value = 1000;
1469 /* reset do_transmit values for next time */
1472 pos->do_transmit = GNUNET_NO;
1476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1477 "Deferring transmission for 1s due to underfull message buffer size\n");
1481 /* select marked messages (up to size) for transmission */
1486 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
1488 pos->do_transmit = GNUNET_YES; /* mark for transmission */
1493 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
1497 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1498 "Selected %u bytes of plaintext messages for transmission to `%4s'.\n",
1499 off, GNUNET_i2s (&n->peer));
1506 * Batch multiple messages into a larger buffer.
1508 * @param n neighbour to take messages from
1509 * @param buf target buffer
1510 * @param size size of buf
1511 * @param deadline set to transmission deadline for the result
1512 * @param retry_time set to the time when we should try again
1513 * (only valid if this function returns zero)
1514 * @param priority set to the priority of the batch
1515 * @return number of bytes written to buf (can be zero)
1518 batch_message (struct Neighbour *n,
1521 struct GNUNET_TIME_Absolute *deadline,
1522 struct GNUNET_TIME_Relative *retry_time,
1523 unsigned int *priority)
1525 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE];
1526 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
1527 struct MessageEntry *pos;
1528 struct MessageEntry *prev;
1529 struct MessageEntry *next;
1534 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1535 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
1536 if (0 == select_messages (n, size, retry_time))
1538 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1539 "No messages selected, will try again in %llu ms\n",
1543 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
1544 ntm->distance = htonl (n->last_distance);
1545 ntm->latency = GNUNET_TIME_relative_hton (n->last_latency);
1546 ntm->peer = n->peer;
1550 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
1553 if (GNUNET_YES == pos->do_transmit)
1555 GNUNET_assert (pos->size <= size);
1556 /* do notifications */
1557 /* FIXME: track if we have *any* client that wants
1558 full notifications and only do this if that is
1560 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
1562 memcpy (&ntm[1], &pos[1], pos->size);
1563 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1564 sizeof (struct GNUNET_MessageHeader));
1565 send_to_all_clients (&ntm->header,
1567 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
1571 /* message too large for 'full' notifications, we do at
1572 least the 'hdr' type */
1575 sizeof (struct GNUNET_MessageHeader));
1577 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1579 send_to_all_clients (&ntm->header,
1581 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
1584 "Encrypting message of type %u\n",
1585 ntohs(((struct GNUNET_MessageHeader*)&pos[1])->type));
1587 /* copy for encrypted transmission */
1588 memcpy (&buf[ret], &pos[1], pos->size);
1591 *priority += pos->priority;
1593 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1594 "Adding plaintext message with deadline %llu ms to batch\n",
1595 GNUNET_TIME_absolute_get_remaining (pos->deadline).value);
1597 deadline->value = GNUNET_MIN (deadline->value, pos->deadline.value);
1611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1612 "Deadline for message batch is %llu ms\n",
1613 GNUNET_TIME_absolute_get_remaining (*deadline).value);
1620 * Remove messages with deadlines that have long expired from
1623 * @param n neighbour to inspect
1626 discard_expired_messages (struct Neighbour *n)
1628 struct MessageEntry *prev;
1629 struct MessageEntry *next;
1630 struct MessageEntry *pos;
1631 struct GNUNET_TIME_Absolute now;
1632 struct GNUNET_TIME_Relative delta;
1634 now = GNUNET_TIME_absolute_get ();
1640 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
1641 if (delta.value > PAST_EXPIRATION_DISCARD_TIME.value)
1644 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1645 "Message is %llu ms past due, discarding.\n",
1662 * Signature of the main function of a task.
1664 * @param cls closure
1665 * @param tc context information (why was this task triggered now)
1668 retry_plaintext_processing (void *cls,
1669 const struct GNUNET_SCHEDULER_TaskContext *tc)
1671 struct Neighbour *n = cls;
1673 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1674 process_plaintext_neighbour_queue (n);
1679 * Send our key (and encrypted PING) to the other peer.
1681 * @param n the other peer
1683 static void send_key (struct Neighbour *n);
1686 * Task that will retry "send_key" if our previous attempt failed
1690 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1692 struct Neighbour *n = cls;
1694 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
1695 n->set_key_retry_frequency =
1696 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
1702 * Check if we have plaintext messages for the specified neighbour
1703 * pending, and if so, consider batching and encrypting them (and
1704 * then trigger processing of the encrypted queue if needed).
1706 * @param n neighbour to check.
1709 process_plaintext_neighbour_queue (struct Neighbour *n)
1711 char pbuf[MAX_ENCRYPTED_MESSAGE_SIZE]; /* plaintext */
1714 struct EncryptedMessage *em; /* encrypted message */
1715 struct EncryptedMessage *ph; /* plaintext header */
1716 struct MessageEntry *me;
1717 unsigned int priority;
1718 struct GNUNET_TIME_Absolute deadline;
1719 struct GNUNET_TIME_Relative retry_time;
1721 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1723 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1724 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1728 case PEER_STATE_DOWN:
1731 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1732 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1733 GNUNET_i2s(&n->peer));
1736 case PEER_STATE_KEY_SENT:
1737 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1738 n->retry_set_key_task
1739 = GNUNET_SCHEDULER_add_delayed (sched,
1740 n->set_key_retry_frequency,
1741 &set_key_retry_task, n);
1743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1744 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1745 GNUNET_i2s(&n->peer));
1748 case PEER_STATE_KEY_RECEIVED:
1749 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1750 n->retry_set_key_task
1751 = GNUNET_SCHEDULER_add_delayed (sched,
1752 n->set_key_retry_frequency,
1753 &set_key_retry_task, n);
1755 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1756 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1757 GNUNET_i2s(&n->peer));
1760 case PEER_STATE_KEY_CONFIRMED:
1761 /* ready to continue */
1764 discard_expired_messages (n);
1765 if (n->messages == NULL)
1768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1769 "Plaintext message queue for `%4s' is empty.\n",
1770 GNUNET_i2s(&n->peer));
1772 return; /* no pending messages */
1774 if (n->encrypted_head != NULL)
1777 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1778 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
1779 GNUNET_i2s(&n->peer));
1781 return; /* wait for messages already encrypted to be
1784 ph = (struct EncryptedMessage *) pbuf;
1785 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1787 used = sizeof (struct EncryptedMessage);
1788 used += batch_message (n,
1790 MAX_ENCRYPTED_MESSAGE_SIZE - used,
1791 &deadline, &retry_time, &priority);
1792 if (used == sizeof (struct EncryptedMessage))
1795 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1796 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
1797 GNUNET_i2s(&n->peer));
1799 /* no messages selected for sending, try again later... */
1800 n->retry_plaintext_task =
1801 GNUNET_SCHEDULER_add_delayed (sched,
1803 &retry_plaintext_processing, n);
1806 ph->sequence_number = htonl (++n->last_sequence_number_sent);
1807 ph->inbound_bpm_limit = htonl (n->bpm_in);
1808 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1810 /* setup encryption message header */
1811 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
1812 me->deadline = deadline;
1813 me->priority = priority;
1815 em = (struct EncryptedMessage *) &me[1];
1816 em->header.size = htons (used);
1817 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
1818 em->reserved = htonl (0);
1819 esize = used - ENCRYPTED_HEADER_SIZE;
1820 GNUNET_CRYPTO_hash (&ph->sequence_number, esize, &em->plaintext_hash);
1823 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1824 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
1826 GNUNET_i2s(&n->peer),
1827 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).value);
1829 GNUNET_assert (GNUNET_OK ==
1831 &em->plaintext_hash,
1832 &ph->sequence_number,
1833 &em->sequence_number, esize));
1834 /* append to transmission list */
1835 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1839 process_encrypted_neighbour_queue (n);
1844 * Function that recalculates the bandwidth quota for the
1845 * given neighbour and transmits it to the transport service.
1847 * @param cls neighbour for the quota update
1851 neighbour_quota_update (void *cls,
1852 const struct GNUNET_SCHEDULER_TaskContext *tc);
1856 * Schedule the task that will recalculate the bandwidth
1857 * quota for this peer (and possibly force a disconnect of
1858 * idle peers by calculating a bandwidth of zero).
1861 schedule_quota_update (struct Neighbour *n)
1863 GNUNET_assert (n->quota_update_task ==
1864 GNUNET_SCHEDULER_NO_TASK);
1865 n->quota_update_task
1866 = GNUNET_SCHEDULER_add_delayed (sched,
1867 QUOTA_UPDATE_FREQUENCY,
1868 &neighbour_quota_update,
1874 * Initialize a new 'struct Neighbour'.
1876 * @param pid ID of the new neighbour
1877 * @return handle for the new neighbour
1879 static struct Neighbour *
1880 create_neighbour (const struct GNUNET_PeerIdentity *pid)
1882 struct Neighbour *n;
1883 struct GNUNET_TIME_Absolute now;
1885 n = GNUNET_malloc (sizeof (struct Neighbour));
1886 n->next = neighbours;
1890 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
1891 now = GNUNET_TIME_absolute_get ();
1892 n->encrypt_key_created = now;
1893 n->last_activity = now;
1894 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
1895 n->bpm_in = GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT;
1896 n->bpm_out = GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT;
1897 n->bpm_out_internal_limit = (uint32_t) - 1;
1898 n->bpm_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT;
1899 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1901 schedule_quota_update (n);
1910 * Handle CORE_SEND request.
1913 * @param client the client issuing the request
1914 * @param message the "struct SendMessage"
1917 handle_client_send (void *cls,
1918 struct GNUNET_SERVER_Client *client,
1919 const struct GNUNET_MessageHeader *message)
1921 const struct SendMessage *sm;
1922 const struct GNUNET_MessageHeader *mh;
1923 struct Neighbour *n;
1924 struct MessageEntry *prev;
1925 struct MessageEntry *pos;
1926 struct MessageEntry *e;
1927 struct MessageEntry *min_prio_entry;
1928 struct MessageEntry *min_prio_prev;
1929 unsigned int min_prio;
1930 unsigned int queue_size;
1933 msize = ntohs (message->size);
1935 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
1939 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1942 sm = (const struct SendMessage *) message;
1943 msize -= sizeof (struct SendMessage);
1944 mh = (const struct GNUNET_MessageHeader *) &sm[1];
1945 if (msize != ntohs (mh->size))
1949 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1952 n = find_neighbour (&sm->peer);
1954 n = create_neighbour (&sm->peer);
1956 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1957 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
1960 GNUNET_i2s (&sm->peer));
1962 /* bound queue size */
1963 discard_expired_messages (n);
1964 min_prio = (unsigned int) -1;
1965 min_prio_entry = NULL;
1966 min_prio_prev = NULL;
1972 if (pos->priority < min_prio)
1974 min_prio_entry = pos;
1975 min_prio_prev = prev;
1976 min_prio = pos->priority;
1982 if (queue_size >= MAX_PEER_QUEUE_SIZE)
1985 if (ntohl(sm->priority) <= min_prio)
1987 /* discard new entry */
1989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1990 "Queue full, discarding new request\n");
1993 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1996 /* discard "min_prio_entry" */
1998 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1999 "Queue full, discarding existing older request\n");
2001 if (min_prio_prev == NULL)
2002 n->messages = min_prio_entry->next;
2004 min_prio_prev->next = min_prio_entry->next;
2005 GNUNET_free (min_prio_entry);
2009 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2010 "Adding transmission request for `%4s' to queue\n",
2011 GNUNET_i2s (&sm->peer));
2013 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2014 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2015 e->priority = ntohl (sm->priority);
2017 memcpy (&e[1], mh, msize);
2019 /* insert, keep list sorted by deadline */
2022 while ((pos != NULL) && (pos->deadline.value < e->deadline.value))
2033 /* consider scheduling now */
2034 process_plaintext_neighbour_queue (n);
2036 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2041 * Function called when the transport service is ready to
2042 * receive a message. Only resets 'n->th' to NULL.
2044 * @param cls neighbour to use message from
2045 * @param size number of bytes we can transmit
2046 * @param buf where to copy the message
2047 * @return number of bytes transmitted
2050 notify_transport_connect_done (void *cls, size_t size, void *buf)
2052 struct Neighbour *n = cls;
2060 * Handle CORE_REQUEST_CONNECT request.
2063 * @param client the client issuing the request
2064 * @param message the "struct ConnectMessage"
2067 handle_client_request_connect (void *cls,
2068 struct GNUNET_SERVER_Client *client,
2069 const struct GNUNET_MessageHeader *message)
2071 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2072 struct Neighbour *n;
2073 struct GNUNET_TIME_Relative timeout;
2075 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2076 n = find_neighbour (&cm->peer);
2078 n = create_neighbour (&cm->peer);
2079 if ( (n->is_connected) ||
2081 return; /* already connected, or at least trying */
2083 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2084 "Core received `%s' request for `%4s', will try to establish connection\n",
2086 GNUNET_i2s (&cm->peer));
2088 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2089 /* ask transport to connect to the peer */
2090 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2092 sizeof (struct GNUNET_MessageHeader), 0,
2094 ¬ify_transport_connect_done,
2096 GNUNET_break (NULL != n->th);
2101 * List of handlers for the messages understood by this
2104 static struct GNUNET_SERVER_MessageHandler handlers[] = {
2105 {&handle_client_init, NULL,
2106 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
2107 {&handle_client_request_info, NULL,
2108 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
2109 sizeof (struct RequestInfoMessage)},
2110 {&handle_client_send, NULL,
2111 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
2112 {&handle_client_request_connect, NULL,
2113 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
2114 sizeof (struct ConnectMessage)},
2120 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2121 * the neighbour's struct and retry send_key. Or, if we did not get a
2122 * HELLO, just do nothing.
2124 * @param cls the 'struct Neighbour' to retry sending the key for
2125 * @param peer the peer for which this is the HELLO
2126 * @param hello HELLO message of that peer
2127 * @param trust amount of trust we currently have in that peer
2130 process_hello_retry_send_key (void *cls,
2131 const struct GNUNET_PeerIdentity *peer,
2132 const struct GNUNET_HELLO_Message *hello,
2135 struct Neighbour *n = cls;
2140 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2141 "Entered `process_hello_retry_send_key' and `peer' is NULL!\n");
2144 if (n->public_key != NULL)
2150 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2151 n->retry_set_key_task
2152 = GNUNET_SCHEDULER_add_delayed (sched,
2153 n->set_key_retry_frequency,
2154 &set_key_retry_task, n);
2160 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2161 "Entered `process_hello_retry_send_key' for peer `%4s'\n",
2164 if (n->public_key != NULL)
2167 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2168 "already have public key for peer %s!! (so why are we here?)\n",
2175 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2176 "Received new `%s' message for `%4s', initiating key exchange.\n",
2181 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2182 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2184 GNUNET_free (n->public_key);
2185 n->public_key = NULL;
2187 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2188 "GNUNET_HELLO_get_key returned awfully\n");
2196 * Send our key (and encrypted PING) to the other peer.
2198 * @param n the other peer
2201 send_key (struct Neighbour *n)
2203 struct SetKeyMessage *sm;
2204 struct MessageEntry *me;
2205 struct PingMessage pp;
2206 struct PingMessage *pm;
2208 if ( (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK) ||
2212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2213 "Key exchange in progress with `%4s'.\n",
2214 GNUNET_i2s (&n->peer));
2216 return; /* already in progress */
2220 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2221 "Asked to perform key exchange with `%4s'.\n",
2222 GNUNET_i2s (&n->peer));
2224 if (n->public_key == NULL)
2226 /* lookup n's public key, then try again */
2228 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2229 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2230 GNUNET_i2s (&n->peer));
2232 GNUNET_assert (n->pitr == NULL);
2233 n->pitr = GNUNET_PEERINFO_iterate (cfg,
2237 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2238 &process_hello_retry_send_key, n);
2241 /* first, set key message */
2242 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2243 sizeof (struct SetKeyMessage));
2244 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
2245 me->priority = SET_KEY_PRIORITY;
2246 me->size = sizeof (struct SetKeyMessage);
2247 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2251 sm = (struct SetKeyMessage *) &me[1];
2252 sm->header.size = htons (sizeof (struct SetKeyMessage));
2253 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
2254 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
2255 PEER_STATE_KEY_SENT : n->status));
2257 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2258 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2259 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2260 sizeof (struct GNUNET_PeerIdentity));
2261 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
2262 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
2263 sm->target = n->peer;
2264 GNUNET_assert (GNUNET_OK ==
2265 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
2267 GNUNET_CRYPTO_AesSessionKey),
2269 &sm->encrypted_key));
2270 GNUNET_assert (GNUNET_OK ==
2271 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
2274 /* second, encrypted PING message */
2275 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2276 sizeof (struct PingMessage));
2277 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
2278 me->priority = PING_PRIORITY;
2279 me->size = sizeof (struct PingMessage);
2280 n->encrypted_tail->next = me;
2281 n->encrypted_tail = me;
2282 pm = (struct PingMessage *) &me[1];
2283 pm->header.size = htons (sizeof (struct PingMessage));
2284 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
2285 pp.challenge = htonl (n->ping_challenge);
2286 pp.target = n->peer;
2288 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2289 "Encrypting `%s' and `%s' messages for `%4s'.\n",
2290 "SET_KEY", "PING", GNUNET_i2s (&n->peer));
2291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2292 "Sending `%s' to `%4s' with challenge %u encrypted using key %u\n",
2294 GNUNET_i2s (&n->peer), n->ping_challenge, n->encrypt_key.crc32);
2297 &n->peer.hashPubKey,
2300 sizeof (struct PingMessage) -
2301 sizeof (struct GNUNET_MessageHeader));
2305 case PEER_STATE_DOWN:
2306 n->status = PEER_STATE_KEY_SENT;
2308 case PEER_STATE_KEY_SENT:
2310 case PEER_STATE_KEY_RECEIVED:
2312 case PEER_STATE_KEY_CONFIRMED:
2319 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2320 "Have %llu ms left for `%s' transmission.\n",
2321 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).value,
2324 /* trigger queue processing */
2325 process_encrypted_neighbour_queue (n);
2326 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
2327 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
2328 n->retry_set_key_task
2329 = GNUNET_SCHEDULER_add_delayed (sched,
2330 n->set_key_retry_frequency,
2331 &set_key_retry_task, n);
2336 * We received a SET_KEY message. Validate and update
2337 * our key material and status.
2339 * @param n the neighbour from which we received message m
2340 * @param m the set key message we received
2343 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m);
2347 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2348 * the neighbour's struct and retry handling the set_key message. Or,
2349 * if we did not get a HELLO, just free the set key message.
2351 * @param cls pointer to the set key message
2352 * @param peer the peer for which this is the HELLO
2353 * @param hello HELLO message of that peer
2354 * @param trust amount of trust we currently have in that peer
2357 process_hello_retry_handle_set_key (void *cls,
2358 const struct GNUNET_PeerIdentity *peer,
2359 const struct GNUNET_HELLO_Message *hello,
2362 struct Neighbour *n = cls;
2363 struct SetKeyMessage *sm = n->skm;
2372 if (n->public_key != NULL)
2373 return; /* multiple HELLOs match!? */
2375 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2376 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2378 GNUNET_break_op (0);
2379 GNUNET_free (n->public_key);
2380 n->public_key = NULL;
2384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2385 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
2386 "HELLO", GNUNET_i2s (peer), "SET_KEY");
2388 handle_set_key (n, sm);
2393 * We received a PING message. Validate and transmit
2396 * @param n sender of the PING
2397 * @param m the encrypted PING message itself
2400 handle_ping (struct Neighbour *n, const struct PingMessage *m)
2402 struct PingMessage t;
2403 struct PingMessage *tp;
2404 struct MessageEntry *me;
2407 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2408 "Core service receives `%s' request from `%4s'.\n",
2409 "PING", GNUNET_i2s (&n->peer));
2413 &my_identity.hashPubKey,
2416 sizeof (struct PingMessage) -
2417 sizeof (struct GNUNET_MessageHeader)))
2420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2421 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u\n",
2423 GNUNET_i2s (&t.target),
2424 ntohl (t.challenge), n->decrypt_key.crc32);
2425 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2426 "Target of `%s' request is `%4s'.\n",
2427 "PING", GNUNET_i2s (&t.target));
2429 if (0 != memcmp (&t.target,
2430 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2432 GNUNET_break_op (0);
2435 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2436 sizeof (struct PingMessage));
2437 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2441 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
2442 me->priority = PONG_PRIORITY;
2443 me->size = sizeof (struct PingMessage);
2444 tp = (struct PingMessage *) &me[1];
2445 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
2446 tp->header.size = htons (sizeof (struct PingMessage));
2448 &my_identity.hashPubKey,
2451 sizeof (struct PingMessage) -
2452 sizeof (struct GNUNET_MessageHeader));
2454 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2455 "Encrypting `%s' with challenge %u using key %u\n", "PONG",
2456 ntohl (t.challenge), n->encrypt_key.crc32);
2458 /* trigger queue processing */
2459 process_encrypted_neighbour_queue (n);
2464 * We received a PONG message. Validate and update our status.
2466 * @param n sender of the PONG
2467 * @param m the encrypted PONG message itself
2470 handle_pong (struct Neighbour *n, const struct PingMessage *m)
2472 struct PingMessage t;
2473 struct ConnectNotifyMessage cnm;
2476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2477 "Core service receives `%s' request from `%4s'.\n",
2478 "PONG", GNUNET_i2s (&n->peer));
2482 &n->peer.hashPubKey,
2485 sizeof (struct PingMessage) -
2486 sizeof (struct GNUNET_MessageHeader)))
2489 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2490 "Decrypted `%s' from `%4s' with challenge %u using key %u\n",
2492 GNUNET_i2s (&t.target),
2493 ntohl (t.challenge), n->decrypt_key.crc32);
2495 if ((0 != memcmp (&t.target,
2497 sizeof (struct GNUNET_PeerIdentity))) ||
2498 (n->ping_challenge != ntohl (t.challenge)))
2500 /* PONG malformed */
2502 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2503 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
2504 "PONG", GNUNET_i2s (&n->peer), n->ping_challenge);
2505 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2506 "Received malformed `%s' received from `%4s' with challenge %u\n",
2507 "PONG", GNUNET_i2s (&t.target), ntohl (t.challenge));
2509 GNUNET_break_op (0);
2514 case PEER_STATE_DOWN:
2515 GNUNET_break (0); /* should be impossible */
2517 case PEER_STATE_KEY_SENT:
2518 GNUNET_break (0); /* should be impossible, how did we decrypt? */
2520 case PEER_STATE_KEY_RECEIVED:
2521 n->status = PEER_STATE_KEY_CONFIRMED;
2523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2524 "Confirmed key via `%s' message for peer `%4s'\n",
2525 "PONG", GNUNET_i2s (&n->peer));
2527 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2529 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2530 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2532 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
2533 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
2534 cnm.distance = htonl (n->last_distance);
2535 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
2537 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
2538 process_encrypted_neighbour_queue (n);
2540 case PEER_STATE_KEY_CONFIRMED:
2541 /* duplicate PONG? */
2551 * We received a SET_KEY message. Validate and update
2552 * our key material and status.
2554 * @param n the neighbour from which we received message m
2555 * @param m the set key message we received
2558 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
2560 struct SetKeyMessage *m_cpy;
2561 struct GNUNET_TIME_Absolute t;
2562 struct GNUNET_CRYPTO_AesSessionKey k;
2563 struct PingMessage *ping;
2564 struct PingMessage *pong;
2565 enum PeerStateMachine sender_status;
2568 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2569 "Core service receives `%s' request from `%4s'.\n",
2570 "SET_KEY", GNUNET_i2s (&n->peer));
2572 if (n->public_key == NULL)
2574 if (n->pitr != NULL)
2577 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2578 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
2584 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2585 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
2587 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
2588 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
2589 /* lookup n's public key, then try again */
2590 GNUNET_assert (n->skm == NULL);
2592 n->pitr = GNUNET_PEERINFO_iterate (cfg,
2596 GNUNET_TIME_UNIT_MINUTES,
2597 &process_hello_retry_handle_set_key, n);
2600 if (0 != memcmp (&m->target,
2602 sizeof (struct GNUNET_PeerIdentity)))
2604 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2605 _("Received `%s' message that was not for me. Ignoring.\n"),
2609 if ((ntohl (m->purpose.size) !=
2610 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2611 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2612 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2613 sizeof (struct GNUNET_PeerIdentity)) ||
2615 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
2616 &m->purpose, &m->signature, n->public_key)))
2618 /* invalid signature */
2619 GNUNET_break_op (0);
2622 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
2623 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
2624 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
2625 (t.value < n->decrypt_key_created.value))
2627 /* this could rarely happen due to massive re-ordering of
2628 messages on the network level, but is most likely either
2629 a bug or some adversary messing with us. Report. */
2630 GNUNET_break_op (0);
2634 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Decrypting key material.\n");
2636 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
2639 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
2640 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
2641 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
2643 /* failed to decrypt !? */
2644 GNUNET_break_op (0);
2649 if (n->decrypt_key_created.value != t.value)
2651 /* fresh key, reset sequence numbers */
2652 n->last_sequence_number_received = 0;
2653 n->last_packets_bitmap = 0;
2654 n->decrypt_key_created = t;
2656 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
2659 case PEER_STATE_DOWN:
2660 n->status = PEER_STATE_KEY_RECEIVED;
2662 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2663 "Responding to `%s' with my own key.\n", "SET_KEY");
2667 case PEER_STATE_KEY_SENT:
2668 case PEER_STATE_KEY_RECEIVED:
2669 n->status = PEER_STATE_KEY_RECEIVED;
2670 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
2671 (sender_status != PEER_STATE_KEY_CONFIRMED))
2674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2675 "Responding to `%s' with my own key (other peer has status %u).\n",
2676 "SET_KEY", sender_status);
2681 case PEER_STATE_KEY_CONFIRMED:
2682 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
2683 (sender_status != PEER_STATE_KEY_CONFIRMED))
2686 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2687 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
2688 "SET_KEY", sender_status);
2697 if (n->pending_ping != NULL)
2699 ping = n->pending_ping;
2700 n->pending_ping = NULL;
2701 handle_ping (n, ping);
2704 if (n->pending_pong != NULL)
2706 pong = n->pending_pong;
2707 n->pending_pong = NULL;
2708 handle_pong (n, pong);
2715 * Send a P2P message to a client.
2717 * @param sender who sent us the message?
2718 * @param client who should we give the message to?
2719 * @param m contains the message to transmit
2720 * @param msize number of bytes in buf to transmit
2723 send_p2p_message_to_client (struct Neighbour *sender,
2724 struct Client *client,
2725 const void *m, size_t msize)
2727 char buf[msize + sizeof (struct NotifyTrafficMessage)];
2728 struct NotifyTrafficMessage *ntm;
2731 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2732 "Core service passes message from `%4s' of type %u to client.\n",
2733 GNUNET_i2s(&sender->peer),
2734 ntohs (((const struct GNUNET_MessageHeader *) m)->type));
2736 ntm = (struct NotifyTrafficMessage *) buf;
2737 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
2738 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
2739 ntm->distance = htonl (sender->last_distance);
2740 ntm->latency = GNUNET_TIME_relative_hton (sender->last_latency);
2741 ntm->peer = sender->peer;
2742 memcpy (&ntm[1], m, msize);
2743 send_to_client (client, &ntm->header, GNUNET_YES);
2748 * Deliver P2P message to interested clients.
2750 * @param sender who sent us the message?
2751 * @param m the message
2752 * @param msize size of the message (including header)
2755 deliver_message (struct Neighbour *sender,
2756 const struct GNUNET_MessageHeader *m, size_t msize)
2758 struct Client *cpos;
2763 type = ntohs (m->type);
2766 "Received encapsulated message of type %u from `%4s'\n",
2768 GNUNET_i2s (&sender->peer));
2771 while (cpos != NULL)
2773 deliver_full = GNUNET_NO;
2774 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
2775 deliver_full = GNUNET_YES;
2778 for (tpos = 0; tpos < cpos->tcnt; tpos++)
2780 if (type != cpos->types[tpos])
2782 deliver_full = GNUNET_YES;
2786 if (GNUNET_YES == deliver_full)
2787 send_p2p_message_to_client (sender, cpos, m, msize);
2788 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
2789 send_p2p_message_to_client (sender, cpos, m,
2790 sizeof (struct GNUNET_MessageHeader));
2797 * Align P2P message and then deliver to interested clients.
2799 * @param sender who sent us the message?
2800 * @param buffer unaligned (!) buffer containing message
2801 * @param msize size of the message (including header)
2804 align_and_deliver (struct Neighbour *sender, const char *buffer, size_t msize)
2808 /* TODO: call to statistics? */
2809 memcpy (abuf, buffer, msize);
2810 deliver_message (sender, (const struct GNUNET_MessageHeader *) abuf, msize);
2815 * Deliver P2P messages to interested clients.
2817 * @param sender who sent us the message?
2818 * @param buffer buffer containing messages, can be modified
2819 * @param buffer_size size of the buffer (overall)
2820 * @param offset offset where messages in the buffer start
2823 deliver_messages (struct Neighbour *sender,
2824 const char *buffer, size_t buffer_size, size_t offset)
2826 struct GNUNET_MessageHeader *mhp;
2827 struct GNUNET_MessageHeader mh;
2831 while (offset + sizeof (struct GNUNET_MessageHeader) <= buffer_size)
2833 if (0 != offset % sizeof (uint16_t))
2835 /* outch, need to copy to access header */
2836 memcpy (&mh, &buffer[offset], sizeof (struct GNUNET_MessageHeader));
2841 /* can access header directly */
2842 mhp = (struct GNUNET_MessageHeader *) &buffer[offset];
2844 msize = ntohs (mhp->size);
2845 if (msize + offset > buffer_size)
2847 /* malformed message, header says it is larger than what
2848 would fit into the overall buffer */
2849 GNUNET_break_op (0);
2852 #if HAVE_UNALIGNED_64_ACCESS
2853 need_align = (0 != offset % 4) ? GNUNET_YES : GNUNET_NO;
2855 need_align = (0 != offset % 8) ? GNUNET_YES : GNUNET_NO;
2857 if (GNUNET_YES == need_align)
2858 align_and_deliver (sender, &buffer[offset], msize);
2860 deliver_message (sender,
2861 (const struct GNUNET_MessageHeader *)
2862 &buffer[offset], msize);
2869 * We received an encrypted message. Decrypt, validate and
2870 * pass on to the appropriate clients.
2873 handle_encrypted_message (struct Neighbour *n,
2874 const struct EncryptedMessage *m)
2876 size_t size = ntohs (m->header.size);
2878 struct EncryptedMessage *pt; /* plaintext */
2882 struct GNUNET_TIME_Absolute t;
2885 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2886 "Core service receives `%s' request from `%4s'.\n",
2887 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
2893 &m->sequence_number,
2894 &buf[ENCRYPTED_HEADER_SIZE], size - ENCRYPTED_HEADER_SIZE))
2896 pt = (struct EncryptedMessage *) buf;
2899 GNUNET_CRYPTO_hash (&pt->sequence_number,
2900 size - ENCRYPTED_HEADER_SIZE, &ph);
2901 if (0 != memcmp (&ph, &m->plaintext_hash, sizeof (GNUNET_HashCode)))
2903 /* checksum failed */
2904 GNUNET_break_op (0);
2908 /* validate sequence number */
2909 snum = ntohl (pt->sequence_number);
2910 if (n->last_sequence_number_received == snum)
2912 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2913 "Received duplicate message, ignoring.\n");
2914 /* duplicate, ignore */
2917 if ((n->last_sequence_number_received > snum) &&
2918 (n->last_sequence_number_received - snum > 32))
2920 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2921 "Received ancient out of sequence message, ignoring.\n");
2922 /* ancient out of sequence, ignore */
2925 if (n->last_sequence_number_received > snum)
2927 unsigned int rotbit =
2928 1 << (n->last_sequence_number_received - snum - 1);
2929 if ((n->last_packets_bitmap & rotbit) != 0)
2931 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2932 "Received duplicate message, ignoring.\n");
2933 /* duplicate, ignore */
2936 n->last_packets_bitmap |= rotbit;
2938 if (n->last_sequence_number_received < snum)
2940 n->last_packets_bitmap <<= (snum - n->last_sequence_number_received);
2941 n->last_sequence_number_received = snum;
2944 /* check timestamp */
2945 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
2946 if (GNUNET_TIME_absolute_get_duration (t).value > MAX_MESSAGE_AGE.value)
2948 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2950 ("Message received far too old (%llu ms). Content ignored.\n"),
2951 GNUNET_TIME_absolute_get_duration (t).value);
2955 /* process decrypted message(s) */
2956 update_window (GNUNET_YES,
2957 &n->available_send_window,
2958 &n->last_asw_update,
2960 n->bpm_out_external_limit = ntohl (pt->inbound_bpm_limit);
2961 n->bpm_out = GNUNET_MAX (n->bpm_out_external_limit,
2962 n->bpm_out_internal_limit);
2963 n->last_activity = GNUNET_TIME_absolute_get ();
2964 off = sizeof (struct EncryptedMessage);
2965 deliver_messages (n, buf, size, off);
2970 * Function called by the transport for each received message.
2972 * @param cls closure
2973 * @param peer (claimed) identity of the other peer
2974 * @param message the message
2975 * @param latency estimated latency for communicating with the
2976 * given peer (round-trip)
2977 * @param distance in overlay hops, as given by transport plugin
2980 handle_transport_receive (void *cls,
2981 const struct GNUNET_PeerIdentity *peer,
2982 const struct GNUNET_MessageHeader *message,
2983 struct GNUNET_TIME_Relative latency,
2984 unsigned int distance)
2986 struct Neighbour *n;
2987 struct GNUNET_TIME_Absolute now;
2993 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2994 "Received message of type %u from `%4s', demultiplexing.\n",
2995 ntohs (message->type), GNUNET_i2s (peer));
2997 n = find_neighbour (peer);
2999 n = create_neighbour (peer);
3002 n->last_latency = latency;
3003 n->last_distance = distance;
3004 up = (n->status == PEER_STATE_KEY_CONFIRMED);
3005 type = ntohs (message->type);
3006 size = ntohs (message->size);
3009 "Received message of type %u from `%4s'\n",
3015 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
3016 if (size != sizeof (struct SetKeyMessage))
3018 GNUNET_break_op (0);
3021 handle_set_key (n, (const struct SetKeyMessage *) message);
3023 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3024 if (size < sizeof (struct EncryptedMessage) +
3025 sizeof (struct GNUNET_MessageHeader))
3027 GNUNET_break_op (0);
3030 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3031 (n->status != PEER_STATE_KEY_CONFIRMED))
3033 GNUNET_break_op (0);
3036 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3038 case GNUNET_MESSAGE_TYPE_CORE_PING:
3039 if (size != sizeof (struct PingMessage))
3041 GNUNET_break_op (0);
3044 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3045 (n->status != PEER_STATE_KEY_CONFIRMED))
3048 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3049 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3050 "PING", GNUNET_i2s (&n->peer));
3052 GNUNET_free_non_null (n->pending_ping);
3053 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3054 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3057 handle_ping (n, (const struct PingMessage *) message);
3059 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3060 if (size != sizeof (struct PingMessage))
3062 GNUNET_break_op (0);
3065 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3066 (n->status != PEER_STATE_KEY_CONFIRMED) )
3069 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3070 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3071 "PONG", GNUNET_i2s (&n->peer));
3073 GNUNET_free_non_null (n->pending_pong);
3074 n->pending_pong = GNUNET_malloc (sizeof (struct PingMessage));
3075 memcpy (n->pending_pong, message, sizeof (struct PingMessage));
3078 handle_pong (n, (const struct PingMessage *) message);
3081 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3082 _("Unsupported message of type %u received.\n"), type);
3085 if (n->status == PEER_STATE_KEY_CONFIRMED)
3087 now = GNUNET_TIME_absolute_get ();
3088 n->last_activity = now;
3090 n->time_established = now;
3096 * Function that recalculates the bandwidth quota for the
3097 * given neighbour and transmits it to the transport service.
3099 * @param cls neighbour for the quota update
3103 neighbour_quota_update (void *cls,
3104 const struct GNUNET_SCHEDULER_TaskContext *tc)
3106 struct Neighbour *n = cls;
3110 unsigned long long distributable;
3112 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
3113 /* calculate relative preference among all neighbours;
3114 divides by a bit more to avoid division by zero AND to
3115 account for possibility of new neighbours joining any time
3116 AND to convert to double... */
3117 pref_rel = n->current_preference / (1.0 + preference_sum);
3119 if (bandwidth_target_out > neighbour_count * MIN_BPM_PER_PEER)
3120 distributable = bandwidth_target_out - neighbour_count * MIN_BPM_PER_PEER;
3121 share = distributable * pref_rel;
3122 q_in = MIN_BPM_PER_PEER + (unsigned long long) share;
3123 /* check if we want to disconnect for good due to inactivity */
3124 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) &&
3125 (GNUNET_TIME_absolute_get_duration (n->time_established).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) )
3128 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3129 "Forcing disconnect of `%4s' due to inactivity (?).\n",
3130 GNUNET_i2s (&n->peer));
3132 q_in = 0; /* force disconnect */
3134 if ( (n->bpm_in + MIN_BPM_CHANGE < q_in) ||
3135 (n->bpm_in - MIN_BPM_CHANGE > q_in) )
3138 GNUNET_TRANSPORT_set_quota (transport,
3142 GNUNET_TIME_UNIT_FOREVER_REL,
3145 schedule_quota_update (n);
3150 * Function called by transport to notify us that
3151 * a peer connected to us (on the network level).
3153 * @param cls closure
3154 * @param peer the peer that connected
3155 * @param latency current latency of the connection
3156 * @param distance in overlay hops, as given by transport plugin
3159 handle_transport_notify_connect (void *cls,
3160 const struct GNUNET_PeerIdentity *peer,
3161 struct GNUNET_TIME_Relative latency,
3162 unsigned int distance)
3164 struct Neighbour *n;
3165 struct GNUNET_TIME_Absolute now;
3166 struct ConnectNotifyMessage cnm;
3168 n = find_neighbour (peer);
3171 if (n->is_connected)
3173 /* duplicate connect notification!? */
3180 n = create_neighbour (peer);
3182 now = GNUNET_TIME_absolute_get ();
3183 n->is_connected = GNUNET_YES;
3184 n->last_latency = latency;
3185 n->last_distance = distance;
3186 n->last_asw_update = now;
3187 n->last_arw_update = now;
3189 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3190 "Received connection from `%4s'.\n",
3191 GNUNET_i2s (&n->peer));
3193 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
3194 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_PRE_CONNECT);
3195 cnm.distance = htonl (n->last_distance);
3196 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
3198 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_PRE_CONNECT);
3204 * Function called by transport telling us that a peer
3207 * @param cls closure
3208 * @param peer the peer that disconnected
3211 handle_transport_notify_disconnect (void *cls,
3212 const struct GNUNET_PeerIdentity *peer)
3214 struct DisconnectNotifyMessage cnm;
3215 struct Neighbour *n;
3218 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3219 "Peer `%4s' disconnected from us.\n", GNUNET_i2s (peer));
3221 n = find_neighbour (peer);
3227 GNUNET_break (n->is_connected);
3228 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
3229 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
3231 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
3232 n->is_connected = GNUNET_NO;
3237 * Last task run during shutdown. Disconnects us from
3241 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3243 struct Neighbour *n;
3247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3248 "Core service shutting down.\n");
3250 GNUNET_assert (transport != NULL);
3251 GNUNET_TRANSPORT_disconnect (transport);
3253 while (NULL != (n = neighbours))
3255 neighbours = n->next;
3256 GNUNET_assert (neighbour_count > 0);
3260 GNUNET_SERVER_notification_context_destroy (notifier);
3262 while (NULL != (c = clients))
3263 handle_client_disconnect (NULL, c->client_handle);
3264 if (my_private_key != NULL)
3265 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3270 * Initiate core service.
3272 * @param cls closure
3273 * @param s scheduler to use
3274 * @param serv the initialized server
3275 * @param c configuration to use
3279 struct GNUNET_SCHEDULER_Handle *s,
3280 struct GNUNET_SERVER_Handle *serv,
3281 const struct GNUNET_CONFIGURATION_Handle *c)
3284 unsigned long long qin;
3285 unsigned long long qout;
3286 unsigned long long tneigh;
3292 /* parse configuration */
3295 GNUNET_CONFIGURATION_get_value_number (c,
3298 &bandwidth_target_in)) ||
3300 GNUNET_CONFIGURATION_get_value_number (c,
3303 &bandwidth_target_out)) ||
3305 GNUNET_CONFIGURATION_get_value_filename (c,
3307 "HOSTKEY", &keyfile)))
3309 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3311 ("Core service is lacking key configuration settings. Exiting.\n"));
3312 GNUNET_SCHEDULER_shutdown (s);
3315 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3316 GNUNET_free (keyfile);
3317 if (my_private_key == NULL)
3319 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3320 _("Core service could not access hostkey. Exiting.\n"));
3321 GNUNET_SCHEDULER_shutdown (s);
3324 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3325 GNUNET_CRYPTO_hash (&my_public_key,
3326 sizeof (my_public_key), &my_identity.hashPubKey);
3327 /* setup notification */
3329 notifier = GNUNET_SERVER_notification_context_create (server,
3331 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
3332 /* setup transport connection */
3333 transport = GNUNET_TRANSPORT_connect (sched,
3336 &handle_transport_receive,
3337 &handle_transport_notify_connect,
3338 &handle_transport_notify_disconnect);
3339 GNUNET_assert (NULL != transport);
3340 GNUNET_SCHEDULER_add_delayed (sched,
3341 GNUNET_TIME_UNIT_FOREVER_REL,
3342 &cleaning_task, NULL);
3343 /* process client requests */
3344 GNUNET_SERVER_add_handlers (server, handlers);
3345 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3346 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
3352 * The main function for the transport service.
3354 * @param argc number of arguments from the command line
3355 * @param argv command line arguments
3356 * @return 0 ok, 1 on error
3359 main (int argc, char *const *argv)
3361 return (GNUNET_OK ==
3362 GNUNET_SERVICE_run (argc,
3365 GNUNET_SERVICE_OPTION_NONE,
3366 &run, NULL)) ? 0 : 1;
3369 /* end of gnunet-service-core.c */