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));
1181 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1182 "Transmission of message of type %u and size %u failed\n",
1183 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1188 consider_free_neighbour (n);
1194 * Check if we have plaintext messages for the specified neighbour
1195 * pending, and if so, consider batching and encrypting them (and
1196 * then trigger processing of the encrypted queue if needed).
1198 * @param n neighbour to check.
1200 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1204 * Check if we have encrypted messages for the specified neighbour
1205 * pending, and if so, check with the transport about sending them
1208 * @param n neighbour to check.
1211 process_encrypted_neighbour_queue (struct Neighbour *n)
1213 struct MessageEntry *m;
1216 return; /* request already pending */
1217 m = n->encrypted_head;
1220 /* encrypted queue empty, try plaintext instead */
1221 process_plaintext_neighbour_queue (n);
1225 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1226 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1228 GNUNET_i2s (&n->peer),
1229 GNUNET_TIME_absolute_get_remaining (m->deadline).
1233 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1236 GNUNET_TIME_absolute_get_remaining
1238 ¬ify_encrypted_transmit_ready,
1242 /* message request too large or duplicate request */
1244 /* discard encrypted message */
1245 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1249 process_encrypted_neighbour_queue (n);
1255 * Decrypt size bytes from in and write the result to out. Use the
1256 * key for inbound traffic of the given neighbour. This function does
1257 * NOT do any integrity-checks on the result.
1259 * @param n neighbour we are receiving from
1260 * @param iv initialization vector to use
1261 * @param in ciphertext
1262 * @param out plaintext
1263 * @param size size of in/out
1264 * @return GNUNET_OK on success
1267 do_decrypt (struct Neighbour *n,
1268 const GNUNET_HashCode * iv,
1269 const void *in, void *out, size_t size)
1271 if (size != (uint16_t) size)
1276 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1277 (n->status != PEER_STATE_KEY_CONFIRMED))
1279 GNUNET_break_op (0);
1280 return GNUNET_SYSERR;
1283 GNUNET_CRYPTO_aes_decrypt (in,
1287 GNUNET_CRYPTO_AesInitializationVector *) iv,
1291 return GNUNET_SYSERR;
1294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1295 "Decrypted %u bytes from `%4s' using key %u\n",
1296 size, GNUNET_i2s (&n->peer), n->decrypt_key.crc32);
1303 * Encrypt size bytes from in and write the result to out. Use the
1304 * key for outbound traffic of the given neighbour.
1306 * @param n neighbour we are sending to
1307 * @param iv initialization vector to use
1308 * @param in ciphertext
1309 * @param out plaintext
1310 * @param size size of in/out
1311 * @return GNUNET_OK on success
1314 do_encrypt (struct Neighbour *n,
1315 const GNUNET_HashCode * iv,
1316 const void *in, void *out, size_t size)
1318 if (size != (uint16_t) size)
1323 GNUNET_assert (size ==
1324 GNUNET_CRYPTO_aes_encrypt (in,
1328 GNUNET_CRYPTO_AesInitializationVector
1331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1332 "Encrypted %u bytes for `%4s' using key %u\n", size,
1333 GNUNET_i2s (&n->peer), n->encrypt_key.crc32);
1340 * Select messages for transmission. This heuristic uses a combination
1341 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1342 * and priority-based discard (in case no feasible schedule exist) and
1343 * speculative optimization (defer any kind of transmission until
1344 * we either create a batch of significant size, 25% of max, or until
1345 * we are close to a deadline). Furthermore, when scheduling the
1346 * heuristic also packs as many messages into the batch as possible,
1347 * starting with those with the earliest deadline. Yes, this is fun.
1349 * @param n neighbour to select messages from
1350 * @param size number of bytes to select for transmission
1351 * @param retry_time set to the time when we should try again
1352 * (only valid if this function returns zero)
1353 * @return number of bytes selected, or 0 if we decided to
1354 * defer scheduling overall; in that case, retry_time is set.
1357 select_messages (struct Neighbour *n,
1358 size_t size, struct GNUNET_TIME_Relative *retry_time)
1360 struct MessageEntry *pos;
1361 struct MessageEntry *min;
1362 struct MessageEntry *last;
1363 unsigned int min_prio;
1364 struct GNUNET_TIME_Absolute t;
1365 struct GNUNET_TIME_Absolute now;
1368 unsigned long long slack; /* how long could we wait before missing deadlines? */
1370 int discard_low_prio;
1372 GNUNET_assert (NULL != n->messages);
1373 now = GNUNET_TIME_absolute_get ();
1374 /* last entry in linked list of messages processed */
1376 /* should we remove the entry with the lowest
1377 priority from consideration for scheduling at the
1379 discard_low_prio = GNUNET_YES;
1380 while (GNUNET_YES == discard_low_prio)
1384 discard_low_prio = GNUNET_NO;
1385 /* calculate number of bytes available for transmission at time "t" */
1386 update_window (GNUNET_NO,
1387 &n->available_send_window,
1388 &n->last_asw_update,
1390 avail = n->available_send_window;
1391 t = n->last_asw_update;
1392 /* how many bytes have we (hypothetically) scheduled so far */
1394 /* maximum time we can wait before transmitting anything
1395 and still make all of our deadlines */
1399 /* note that we use "*2" here because we want to look
1400 a bit further into the future; much more makes no
1401 sense since new message might be scheduled in the
1403 while ((pos != NULL) && (off < size * 2))
1405 if (pos->do_transmit == GNUNET_YES)
1407 /* already removed from consideration */
1411 if (discard_low_prio == GNUNET_NO)
1413 delta = pos->deadline.value;
1414 if (delta < t.value)
1417 delta = t.value - delta;
1418 avail += delta * n->bpm_out / 1000 / 60;
1419 if (avail < pos->size)
1421 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1426 /* update slack, considering both its absolute deadline
1427 and relative deadlines caused by other messages
1428 with their respective load */
1429 slack = GNUNET_MIN (slack, avail / n->bpm_out);
1430 if ( (pos->deadline.value < now.value) ||
1431 (GNUNET_YES == pos->got_slack) )
1438 GNUNET_MIN (slack, pos->deadline.value - now.value);
1439 pos->got_slack = GNUNET_YES;
1445 t.value = GNUNET_MAX (pos->deadline.value, t.value);
1446 if (pos->priority <= min_prio)
1448 /* update min for discard */
1449 min_prio = pos->priority;
1454 if (discard_low_prio)
1456 GNUNET_assert (min != NULL);
1457 /* remove lowest-priority entry from consideration */
1458 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1462 /* guard against sending "tiny" messages with large headers without
1464 if ( (slack > 1000) && (size > 4 * off) )
1466 /* less than 25% of message would be filled with deadlines still
1467 being met if we delay by one second or more; so just wait for
1468 more data; but do not wait longer than 1s (since we don't want
1469 to delay messages for a really long time either). */
1470 retry_time->value = 1000;
1471 /* reset do_transmit values for next time */
1474 pos->do_transmit = GNUNET_NO;
1478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1479 "Deferring transmission for 1s due to underfull message buffer size\n");
1483 /* select marked messages (up to size) for transmission */
1488 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
1490 pos->do_transmit = GNUNET_YES; /* mark for transmission */
1495 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
1499 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1500 "Selected %u bytes of plaintext messages for transmission to `%4s'.\n",
1501 off, GNUNET_i2s (&n->peer));
1508 * Batch multiple messages into a larger buffer.
1510 * @param n neighbour to take messages from
1511 * @param buf target buffer
1512 * @param size size of buf
1513 * @param deadline set to transmission deadline for the result
1514 * @param retry_time set to the time when we should try again
1515 * (only valid if this function returns zero)
1516 * @param priority set to the priority of the batch
1517 * @return number of bytes written to buf (can be zero)
1520 batch_message (struct Neighbour *n,
1523 struct GNUNET_TIME_Absolute *deadline,
1524 struct GNUNET_TIME_Relative *retry_time,
1525 unsigned int *priority)
1527 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE];
1528 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
1529 struct MessageEntry *pos;
1530 struct MessageEntry *prev;
1531 struct MessageEntry *next;
1536 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1537 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
1538 if (0 == select_messages (n, size, retry_time))
1540 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1541 "No messages selected, will try again in %llu ms\n",
1545 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
1546 ntm->distance = htonl (n->last_distance);
1547 ntm->latency = GNUNET_TIME_relative_hton (n->last_latency);
1548 ntm->peer = n->peer;
1552 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
1555 if (GNUNET_YES == pos->do_transmit)
1557 GNUNET_assert (pos->size <= size);
1558 /* do notifications */
1559 /* FIXME: track if we have *any* client that wants
1560 full notifications and only do this if that is
1562 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
1564 memcpy (&ntm[1], &pos[1], pos->size);
1565 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1566 sizeof (struct GNUNET_MessageHeader));
1567 send_to_all_clients (&ntm->header,
1569 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
1573 /* message too large for 'full' notifications, we do at
1574 least the 'hdr' type */
1577 sizeof (struct GNUNET_MessageHeader));
1579 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1581 send_to_all_clients (&ntm->header,
1583 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
1586 "Encrypting message of type %u\n",
1587 ntohs(((struct GNUNET_MessageHeader*)&pos[1])->type));
1589 /* copy for encrypted transmission */
1590 memcpy (&buf[ret], &pos[1], pos->size);
1593 *priority += pos->priority;
1595 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1596 "Adding plaintext message with deadline %llu ms to batch\n",
1597 GNUNET_TIME_absolute_get_remaining (pos->deadline).value);
1599 deadline->value = GNUNET_MIN (deadline->value, pos->deadline.value);
1613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1614 "Deadline for message batch is %llu ms\n",
1615 GNUNET_TIME_absolute_get_remaining (*deadline).value);
1622 * Remove messages with deadlines that have long expired from
1625 * @param n neighbour to inspect
1628 discard_expired_messages (struct Neighbour *n)
1630 struct MessageEntry *prev;
1631 struct MessageEntry *next;
1632 struct MessageEntry *pos;
1633 struct GNUNET_TIME_Absolute now;
1634 struct GNUNET_TIME_Relative delta;
1636 now = GNUNET_TIME_absolute_get ();
1642 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
1643 if (delta.value > PAST_EXPIRATION_DISCARD_TIME.value)
1646 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1647 "Message is %llu ms past due, discarding.\n",
1664 * Signature of the main function of a task.
1666 * @param cls closure
1667 * @param tc context information (why was this task triggered now)
1670 retry_plaintext_processing (void *cls,
1671 const struct GNUNET_SCHEDULER_TaskContext *tc)
1673 struct Neighbour *n = cls;
1675 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1676 process_plaintext_neighbour_queue (n);
1681 * Send our key (and encrypted PING) to the other peer.
1683 * @param n the other peer
1685 static void send_key (struct Neighbour *n);
1688 * Task that will retry "send_key" if our previous attempt failed
1692 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1694 struct Neighbour *n = cls;
1696 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
1697 n->set_key_retry_frequency =
1698 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
1704 * Check if we have plaintext messages for the specified neighbour
1705 * pending, and if so, consider batching and encrypting them (and
1706 * then trigger processing of the encrypted queue if needed).
1708 * @param n neighbour to check.
1711 process_plaintext_neighbour_queue (struct Neighbour *n)
1713 char pbuf[MAX_ENCRYPTED_MESSAGE_SIZE]; /* plaintext */
1716 struct EncryptedMessage *em; /* encrypted message */
1717 struct EncryptedMessage *ph; /* plaintext header */
1718 struct MessageEntry *me;
1719 unsigned int priority;
1720 struct GNUNET_TIME_Absolute deadline;
1721 struct GNUNET_TIME_Relative retry_time;
1723 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1725 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1726 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1730 case PEER_STATE_DOWN:
1733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1734 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1735 GNUNET_i2s(&n->peer));
1738 case PEER_STATE_KEY_SENT:
1739 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1740 n->retry_set_key_task
1741 = GNUNET_SCHEDULER_add_delayed (sched,
1742 n->set_key_retry_frequency,
1743 &set_key_retry_task, n);
1745 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1746 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1747 GNUNET_i2s(&n->peer));
1750 case PEER_STATE_KEY_RECEIVED:
1751 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1752 n->retry_set_key_task
1753 = GNUNET_SCHEDULER_add_delayed (sched,
1754 n->set_key_retry_frequency,
1755 &set_key_retry_task, n);
1757 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1758 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1759 GNUNET_i2s(&n->peer));
1762 case PEER_STATE_KEY_CONFIRMED:
1763 /* ready to continue */
1766 discard_expired_messages (n);
1767 if (n->messages == NULL)
1770 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1771 "Plaintext message queue for `%4s' is empty.\n",
1772 GNUNET_i2s(&n->peer));
1774 return; /* no pending messages */
1776 if (n->encrypted_head != NULL)
1779 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1780 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
1781 GNUNET_i2s(&n->peer));
1783 return; /* wait for messages already encrypted to be
1786 ph = (struct EncryptedMessage *) pbuf;
1787 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1789 used = sizeof (struct EncryptedMessage);
1790 used += batch_message (n,
1792 MAX_ENCRYPTED_MESSAGE_SIZE - used,
1793 &deadline, &retry_time, &priority);
1794 if (used == sizeof (struct EncryptedMessage))
1797 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1798 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
1799 GNUNET_i2s(&n->peer));
1801 /* no messages selected for sending, try again later... */
1802 n->retry_plaintext_task =
1803 GNUNET_SCHEDULER_add_delayed (sched,
1805 &retry_plaintext_processing, n);
1808 ph->sequence_number = htonl (++n->last_sequence_number_sent);
1809 ph->inbound_bpm_limit = htonl (n->bpm_in);
1810 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1812 /* setup encryption message header */
1813 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
1814 me->deadline = deadline;
1815 me->priority = priority;
1817 em = (struct EncryptedMessage *) &me[1];
1818 em->header.size = htons (used);
1819 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
1820 em->reserved = htonl (0);
1821 esize = used - ENCRYPTED_HEADER_SIZE;
1822 GNUNET_CRYPTO_hash (&ph->sequence_number, esize, &em->plaintext_hash);
1825 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1826 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
1828 GNUNET_i2s(&n->peer),
1829 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).value);
1831 GNUNET_assert (GNUNET_OK ==
1833 &em->plaintext_hash,
1834 &ph->sequence_number,
1835 &em->sequence_number, esize));
1836 /* append to transmission list */
1837 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1841 process_encrypted_neighbour_queue (n);
1846 * Function that recalculates the bandwidth quota for the
1847 * given neighbour and transmits it to the transport service.
1849 * @param cls neighbour for the quota update
1853 neighbour_quota_update (void *cls,
1854 const struct GNUNET_SCHEDULER_TaskContext *tc);
1858 * Schedule the task that will recalculate the bandwidth
1859 * quota for this peer (and possibly force a disconnect of
1860 * idle peers by calculating a bandwidth of zero).
1863 schedule_quota_update (struct Neighbour *n)
1865 GNUNET_assert (n->quota_update_task ==
1866 GNUNET_SCHEDULER_NO_TASK);
1867 n->quota_update_task
1868 = GNUNET_SCHEDULER_add_delayed (sched,
1869 QUOTA_UPDATE_FREQUENCY,
1870 &neighbour_quota_update,
1876 * Initialize a new 'struct Neighbour'.
1878 * @param pid ID of the new neighbour
1879 * @return handle for the new neighbour
1881 static struct Neighbour *
1882 create_neighbour (const struct GNUNET_PeerIdentity *pid)
1884 struct Neighbour *n;
1885 struct GNUNET_TIME_Absolute now;
1887 n = GNUNET_malloc (sizeof (struct Neighbour));
1888 n->next = neighbours;
1892 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
1893 now = GNUNET_TIME_absolute_get ();
1894 n->encrypt_key_created = now;
1895 n->last_activity = now;
1896 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
1897 n->bpm_in = GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT;
1898 n->bpm_out = GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT;
1899 n->bpm_out_internal_limit = (uint32_t) - 1;
1900 n->bpm_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT;
1901 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1903 schedule_quota_update (n);
1912 * Handle CORE_SEND request.
1915 * @param client the client issuing the request
1916 * @param message the "struct SendMessage"
1919 handle_client_send (void *cls,
1920 struct GNUNET_SERVER_Client *client,
1921 const struct GNUNET_MessageHeader *message)
1923 const struct SendMessage *sm;
1924 const struct GNUNET_MessageHeader *mh;
1925 struct Neighbour *n;
1926 struct MessageEntry *prev;
1927 struct MessageEntry *pos;
1928 struct MessageEntry *e;
1929 struct MessageEntry *min_prio_entry;
1930 struct MessageEntry *min_prio_prev;
1931 unsigned int min_prio;
1932 unsigned int queue_size;
1935 msize = ntohs (message->size);
1937 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
1941 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1944 sm = (const struct SendMessage *) message;
1945 msize -= sizeof (struct SendMessage);
1946 mh = (const struct GNUNET_MessageHeader *) &sm[1];
1947 if (msize != ntohs (mh->size))
1951 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1954 n = find_neighbour (&sm->peer);
1956 n = create_neighbour (&sm->peer);
1958 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1959 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
1962 GNUNET_i2s (&sm->peer));
1964 /* bound queue size */
1965 discard_expired_messages (n);
1966 min_prio = (unsigned int) -1;
1967 min_prio_entry = NULL;
1968 min_prio_prev = NULL;
1974 if (pos->priority < min_prio)
1976 min_prio_entry = pos;
1977 min_prio_prev = prev;
1978 min_prio = pos->priority;
1984 if (queue_size >= MAX_PEER_QUEUE_SIZE)
1987 if (ntohl(sm->priority) <= min_prio)
1989 /* discard new entry */
1991 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1992 "Queue full, discarding new request\n");
1995 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1998 /* discard "min_prio_entry" */
2000 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2001 "Queue full, discarding existing older request\n");
2003 if (min_prio_prev == NULL)
2004 n->messages = min_prio_entry->next;
2006 min_prio_prev->next = min_prio_entry->next;
2007 GNUNET_free (min_prio_entry);
2011 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2012 "Adding transmission request for `%4s' to queue\n",
2013 GNUNET_i2s (&sm->peer));
2015 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2016 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2017 e->priority = ntohl (sm->priority);
2019 memcpy (&e[1], mh, msize);
2021 /* insert, keep list sorted by deadline */
2024 while ((pos != NULL) && (pos->deadline.value < e->deadline.value))
2035 /* consider scheduling now */
2036 process_plaintext_neighbour_queue (n);
2038 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2043 * Function called when the transport service is ready to
2044 * receive a message. Only resets 'n->th' to NULL.
2046 * @param cls neighbour to use message from
2047 * @param size number of bytes we can transmit
2048 * @param buf where to copy the message
2049 * @return number of bytes transmitted
2052 notify_transport_connect_done (void *cls, size_t size, void *buf)
2054 struct Neighbour *n = cls;
2062 * Handle CORE_REQUEST_CONNECT request.
2065 * @param client the client issuing the request
2066 * @param message the "struct ConnectMessage"
2069 handle_client_request_connect (void *cls,
2070 struct GNUNET_SERVER_Client *client,
2071 const struct GNUNET_MessageHeader *message)
2073 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2074 struct Neighbour *n;
2075 struct GNUNET_TIME_Relative timeout;
2077 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2078 n = find_neighbour (&cm->peer);
2080 n = create_neighbour (&cm->peer);
2081 if ( (n->is_connected) ||
2083 return; /* already connected, or at least trying */
2085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2086 "Core received `%s' request for `%4s', will try to establish connection\n",
2088 GNUNET_i2s (&cm->peer));
2090 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2091 /* ask transport to connect to the peer */
2092 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2094 sizeof (struct GNUNET_MessageHeader), 0,
2096 ¬ify_transport_connect_done,
2098 GNUNET_break (NULL != n->th);
2103 * List of handlers for the messages understood by this
2106 static struct GNUNET_SERVER_MessageHandler handlers[] = {
2107 {&handle_client_init, NULL,
2108 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
2109 {&handle_client_request_info, NULL,
2110 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
2111 sizeof (struct RequestInfoMessage)},
2112 {&handle_client_send, NULL,
2113 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
2114 {&handle_client_request_connect, NULL,
2115 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
2116 sizeof (struct ConnectMessage)},
2122 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2123 * the neighbour's struct and retry send_key. Or, if we did not get a
2124 * HELLO, just do nothing.
2126 * @param cls the 'struct Neighbour' to retry sending the key for
2127 * @param peer the peer for which this is the HELLO
2128 * @param hello HELLO message of that peer
2129 * @param trust amount of trust we currently have in that peer
2132 process_hello_retry_send_key (void *cls,
2133 const struct GNUNET_PeerIdentity *peer,
2134 const struct GNUNET_HELLO_Message *hello,
2137 struct Neighbour *n = cls;
2142 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2143 "Entered `process_hello_retry_send_key' and `peer' is NULL!\n");
2146 if (n->public_key != NULL)
2152 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2153 n->retry_set_key_task
2154 = GNUNET_SCHEDULER_add_delayed (sched,
2155 n->set_key_retry_frequency,
2156 &set_key_retry_task, n);
2162 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2163 "Entered `process_hello_retry_send_key' for peer `%4s'\n",
2166 if (n->public_key != NULL)
2169 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2170 "already have public key for peer %s!! (so why are we here?)\n",
2177 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2178 "Received new `%s' message for `%4s', initiating key exchange.\n",
2183 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2184 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2186 GNUNET_free (n->public_key);
2187 n->public_key = NULL;
2189 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2190 "GNUNET_HELLO_get_key returned awfully\n");
2198 * Send our key (and encrypted PING) to the other peer.
2200 * @param n the other peer
2203 send_key (struct Neighbour *n)
2205 struct SetKeyMessage *sm;
2206 struct MessageEntry *me;
2207 struct PingMessage pp;
2208 struct PingMessage *pm;
2210 if ( (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK) ||
2214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2215 "Key exchange in progress with `%4s'.\n",
2216 GNUNET_i2s (&n->peer));
2218 return; /* already in progress */
2222 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2223 "Asked to perform key exchange with `%4s'.\n",
2224 GNUNET_i2s (&n->peer));
2226 if (n->public_key == NULL)
2228 /* lookup n's public key, then try again */
2230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2231 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2232 GNUNET_i2s (&n->peer));
2234 GNUNET_assert (n->pitr == NULL);
2235 n->pitr = GNUNET_PEERINFO_iterate (cfg,
2239 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2240 &process_hello_retry_send_key, n);
2243 /* first, set key message */
2244 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2245 sizeof (struct SetKeyMessage));
2246 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
2247 me->priority = SET_KEY_PRIORITY;
2248 me->size = sizeof (struct SetKeyMessage);
2249 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2253 sm = (struct SetKeyMessage *) &me[1];
2254 sm->header.size = htons (sizeof (struct SetKeyMessage));
2255 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
2256 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
2257 PEER_STATE_KEY_SENT : n->status));
2259 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2260 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2261 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2262 sizeof (struct GNUNET_PeerIdentity));
2263 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
2264 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
2265 sm->target = n->peer;
2266 GNUNET_assert (GNUNET_OK ==
2267 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
2269 GNUNET_CRYPTO_AesSessionKey),
2271 &sm->encrypted_key));
2272 GNUNET_assert (GNUNET_OK ==
2273 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
2276 /* second, encrypted PING message */
2277 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2278 sizeof (struct PingMessage));
2279 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
2280 me->priority = PING_PRIORITY;
2281 me->size = sizeof (struct PingMessage);
2282 n->encrypted_tail->next = me;
2283 n->encrypted_tail = me;
2284 pm = (struct PingMessage *) &me[1];
2285 pm->header.size = htons (sizeof (struct PingMessage));
2286 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
2287 pp.challenge = htonl (n->ping_challenge);
2288 pp.target = n->peer;
2290 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2291 "Encrypting `%s' and `%s' messages for `%4s'.\n",
2292 "SET_KEY", "PING", GNUNET_i2s (&n->peer));
2293 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2294 "Sending `%s' to `%4s' with challenge %u encrypted using key %u\n",
2296 GNUNET_i2s (&n->peer), n->ping_challenge, n->encrypt_key.crc32);
2299 &n->peer.hashPubKey,
2302 sizeof (struct PingMessage) -
2303 sizeof (struct GNUNET_MessageHeader));
2307 case PEER_STATE_DOWN:
2308 n->status = PEER_STATE_KEY_SENT;
2310 case PEER_STATE_KEY_SENT:
2312 case PEER_STATE_KEY_RECEIVED:
2314 case PEER_STATE_KEY_CONFIRMED:
2321 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2322 "Have %llu ms left for `%s' transmission.\n",
2323 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).value,
2326 /* trigger queue processing */
2327 process_encrypted_neighbour_queue (n);
2328 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
2329 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
2330 n->retry_set_key_task
2331 = GNUNET_SCHEDULER_add_delayed (sched,
2332 n->set_key_retry_frequency,
2333 &set_key_retry_task, n);
2338 * We received a SET_KEY message. Validate and update
2339 * our key material and status.
2341 * @param n the neighbour from which we received message m
2342 * @param m the set key message we received
2345 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m);
2349 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2350 * the neighbour's struct and retry handling the set_key message. Or,
2351 * if we did not get a HELLO, just free the set key message.
2353 * @param cls pointer to the set key message
2354 * @param peer the peer for which this is the HELLO
2355 * @param hello HELLO message of that peer
2356 * @param trust amount of trust we currently have in that peer
2359 process_hello_retry_handle_set_key (void *cls,
2360 const struct GNUNET_PeerIdentity *peer,
2361 const struct GNUNET_HELLO_Message *hello,
2364 struct Neighbour *n = cls;
2365 struct SetKeyMessage *sm = n->skm;
2374 if (n->public_key != NULL)
2375 return; /* multiple HELLOs match!? */
2377 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2378 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2380 GNUNET_break_op (0);
2381 GNUNET_free (n->public_key);
2382 n->public_key = NULL;
2386 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2387 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
2388 "HELLO", GNUNET_i2s (peer), "SET_KEY");
2390 handle_set_key (n, sm);
2395 * We received a PING message. Validate and transmit
2398 * @param n sender of the PING
2399 * @param m the encrypted PING message itself
2402 handle_ping (struct Neighbour *n, const struct PingMessage *m)
2404 struct PingMessage t;
2405 struct PingMessage *tp;
2406 struct MessageEntry *me;
2409 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2410 "Core service receives `%s' request from `%4s'.\n",
2411 "PING", GNUNET_i2s (&n->peer));
2415 &my_identity.hashPubKey,
2418 sizeof (struct PingMessage) -
2419 sizeof (struct GNUNET_MessageHeader)))
2422 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2423 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u\n",
2425 GNUNET_i2s (&t.target),
2426 ntohl (t.challenge), n->decrypt_key.crc32);
2427 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2428 "Target of `%s' request is `%4s'.\n",
2429 "PING", GNUNET_i2s (&t.target));
2431 if (0 != memcmp (&t.target,
2432 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2434 GNUNET_break_op (0);
2437 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2438 sizeof (struct PingMessage));
2439 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2443 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
2444 me->priority = PONG_PRIORITY;
2445 me->size = sizeof (struct PingMessage);
2446 tp = (struct PingMessage *) &me[1];
2447 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
2448 tp->header.size = htons (sizeof (struct PingMessage));
2450 &my_identity.hashPubKey,
2453 sizeof (struct PingMessage) -
2454 sizeof (struct GNUNET_MessageHeader));
2456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2457 "Encrypting `%s' with challenge %u using key %u\n", "PONG",
2458 ntohl (t.challenge), n->encrypt_key.crc32);
2460 /* trigger queue processing */
2461 process_encrypted_neighbour_queue (n);
2466 * We received a PONG message. Validate and update our status.
2468 * @param n sender of the PONG
2469 * @param m the encrypted PONG message itself
2472 handle_pong (struct Neighbour *n, const struct PingMessage *m)
2474 struct PingMessage t;
2475 struct ConnectNotifyMessage cnm;
2478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2479 "Core service receives `%s' request from `%4s'.\n",
2480 "PONG", GNUNET_i2s (&n->peer));
2484 &n->peer.hashPubKey,
2487 sizeof (struct PingMessage) -
2488 sizeof (struct GNUNET_MessageHeader)))
2491 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2492 "Decrypted `%s' from `%4s' with challenge %u using key %u\n",
2494 GNUNET_i2s (&t.target),
2495 ntohl (t.challenge), n->decrypt_key.crc32);
2497 if ((0 != memcmp (&t.target,
2499 sizeof (struct GNUNET_PeerIdentity))) ||
2500 (n->ping_challenge != ntohl (t.challenge)))
2502 /* PONG malformed */
2504 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2505 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
2506 "PONG", GNUNET_i2s (&n->peer), n->ping_challenge);
2507 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2508 "Received malformed `%s' received from `%4s' with challenge %u\n",
2509 "PONG", GNUNET_i2s (&t.target), ntohl (t.challenge));
2511 GNUNET_break_op (0);
2516 case PEER_STATE_DOWN:
2517 GNUNET_break (0); /* should be impossible */
2519 case PEER_STATE_KEY_SENT:
2520 GNUNET_break (0); /* should be impossible, how did we decrypt? */
2522 case PEER_STATE_KEY_RECEIVED:
2523 n->status = PEER_STATE_KEY_CONFIRMED;
2525 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2526 "Confirmed key via `%s' message for peer `%4s'\n",
2527 "PONG", GNUNET_i2s (&n->peer));
2529 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2531 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2532 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2534 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
2535 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
2536 cnm.distance = htonl (n->last_distance);
2537 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
2539 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
2540 process_encrypted_neighbour_queue (n);
2542 case PEER_STATE_KEY_CONFIRMED:
2543 /* duplicate PONG? */
2553 * We received a SET_KEY message. Validate and update
2554 * our key material and status.
2556 * @param n the neighbour from which we received message m
2557 * @param m the set key message we received
2560 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
2562 struct SetKeyMessage *m_cpy;
2563 struct GNUNET_TIME_Absolute t;
2564 struct GNUNET_CRYPTO_AesSessionKey k;
2565 struct PingMessage *ping;
2566 struct PingMessage *pong;
2567 enum PeerStateMachine sender_status;
2570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2571 "Core service receives `%s' request from `%4s'.\n",
2572 "SET_KEY", GNUNET_i2s (&n->peer));
2574 if (n->public_key == NULL)
2576 if (n->pitr != NULL)
2579 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2580 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
2586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2587 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
2589 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
2590 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
2591 /* lookup n's public key, then try again */
2592 GNUNET_assert (n->skm == NULL);
2594 n->pitr = GNUNET_PEERINFO_iterate (cfg,
2598 GNUNET_TIME_UNIT_MINUTES,
2599 &process_hello_retry_handle_set_key, n);
2602 if (0 != memcmp (&m->target,
2604 sizeof (struct GNUNET_PeerIdentity)))
2606 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2607 _("Received `%s' message that was not for me. Ignoring.\n"),
2611 if ((ntohl (m->purpose.size) !=
2612 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2613 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2614 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2615 sizeof (struct GNUNET_PeerIdentity)) ||
2617 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
2618 &m->purpose, &m->signature, n->public_key)))
2620 /* invalid signature */
2621 GNUNET_break_op (0);
2624 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
2625 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
2626 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
2627 (t.value < n->decrypt_key_created.value))
2629 /* this could rarely happen due to massive re-ordering of
2630 messages on the network level, but is most likely either
2631 a bug or some adversary messing with us. Report. */
2632 GNUNET_break_op (0);
2636 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Decrypting key material.\n");
2638 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
2641 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
2642 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
2643 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
2645 /* failed to decrypt !? */
2646 GNUNET_break_op (0);
2651 if (n->decrypt_key_created.value != t.value)
2653 /* fresh key, reset sequence numbers */
2654 n->last_sequence_number_received = 0;
2655 n->last_packets_bitmap = 0;
2656 n->decrypt_key_created = t;
2658 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
2661 case PEER_STATE_DOWN:
2662 n->status = PEER_STATE_KEY_RECEIVED;
2664 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2665 "Responding to `%s' with my own key.\n", "SET_KEY");
2669 case PEER_STATE_KEY_SENT:
2670 case PEER_STATE_KEY_RECEIVED:
2671 n->status = PEER_STATE_KEY_RECEIVED;
2672 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
2673 (sender_status != PEER_STATE_KEY_CONFIRMED))
2676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2677 "Responding to `%s' with my own key (other peer has status %u).\n",
2678 "SET_KEY", sender_status);
2683 case PEER_STATE_KEY_CONFIRMED:
2684 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
2685 (sender_status != PEER_STATE_KEY_CONFIRMED))
2688 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2689 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
2690 "SET_KEY", sender_status);
2699 if (n->pending_ping != NULL)
2701 ping = n->pending_ping;
2702 n->pending_ping = NULL;
2703 handle_ping (n, ping);
2706 if (n->pending_pong != NULL)
2708 pong = n->pending_pong;
2709 n->pending_pong = NULL;
2710 handle_pong (n, pong);
2717 * Send a P2P message to a client.
2719 * @param sender who sent us the message?
2720 * @param client who should we give the message to?
2721 * @param m contains the message to transmit
2722 * @param msize number of bytes in buf to transmit
2725 send_p2p_message_to_client (struct Neighbour *sender,
2726 struct Client *client,
2727 const void *m, size_t msize)
2729 char buf[msize + sizeof (struct NotifyTrafficMessage)];
2730 struct NotifyTrafficMessage *ntm;
2733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2734 "Core service passes message from `%4s' of type %u to client.\n",
2735 GNUNET_i2s(&sender->peer),
2736 ntohs (((const struct GNUNET_MessageHeader *) m)->type));
2738 ntm = (struct NotifyTrafficMessage *) buf;
2739 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
2740 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
2741 ntm->distance = htonl (sender->last_distance);
2742 ntm->latency = GNUNET_TIME_relative_hton (sender->last_latency);
2743 ntm->peer = sender->peer;
2744 memcpy (&ntm[1], m, msize);
2745 send_to_client (client, &ntm->header, GNUNET_YES);
2750 * Deliver P2P message to interested clients.
2752 * @param sender who sent us the message?
2753 * @param m the message
2754 * @param msize size of the message (including header)
2757 deliver_message (struct Neighbour *sender,
2758 const struct GNUNET_MessageHeader *m, size_t msize)
2760 struct Client *cpos;
2765 type = ntohs (m->type);
2768 "Received encapsulated message of type %u from `%4s'\n",
2770 GNUNET_i2s (&sender->peer));
2773 while (cpos != NULL)
2775 deliver_full = GNUNET_NO;
2776 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
2777 deliver_full = GNUNET_YES;
2780 for (tpos = 0; tpos < cpos->tcnt; tpos++)
2782 if (type != cpos->types[tpos])
2784 deliver_full = GNUNET_YES;
2788 if (GNUNET_YES == deliver_full)
2789 send_p2p_message_to_client (sender, cpos, m, msize);
2790 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
2791 send_p2p_message_to_client (sender, cpos, m,
2792 sizeof (struct GNUNET_MessageHeader));
2799 * Align P2P message and then deliver to interested clients.
2801 * @param sender who sent us the message?
2802 * @param buffer unaligned (!) buffer containing message
2803 * @param msize size of the message (including header)
2806 align_and_deliver (struct Neighbour *sender, const char *buffer, size_t msize)
2810 /* TODO: call to statistics? */
2811 memcpy (abuf, buffer, msize);
2812 deliver_message (sender, (const struct GNUNET_MessageHeader *) abuf, msize);
2817 * Deliver P2P messages to interested clients.
2819 * @param sender who sent us the message?
2820 * @param buffer buffer containing messages, can be modified
2821 * @param buffer_size size of the buffer (overall)
2822 * @param offset offset where messages in the buffer start
2825 deliver_messages (struct Neighbour *sender,
2826 const char *buffer, size_t buffer_size, size_t offset)
2828 struct GNUNET_MessageHeader *mhp;
2829 struct GNUNET_MessageHeader mh;
2833 while (offset + sizeof (struct GNUNET_MessageHeader) <= buffer_size)
2835 if (0 != offset % sizeof (uint16_t))
2837 /* outch, need to copy to access header */
2838 memcpy (&mh, &buffer[offset], sizeof (struct GNUNET_MessageHeader));
2843 /* can access header directly */
2844 mhp = (struct GNUNET_MessageHeader *) &buffer[offset];
2846 msize = ntohs (mhp->size);
2847 if (msize + offset > buffer_size)
2849 /* malformed message, header says it is larger than what
2850 would fit into the overall buffer */
2851 GNUNET_break_op (0);
2854 #if HAVE_UNALIGNED_64_ACCESS
2855 need_align = (0 != offset % 4) ? GNUNET_YES : GNUNET_NO;
2857 need_align = (0 != offset % 8) ? GNUNET_YES : GNUNET_NO;
2859 if (GNUNET_YES == need_align)
2860 align_and_deliver (sender, &buffer[offset], msize);
2862 deliver_message (sender,
2863 (const struct GNUNET_MessageHeader *)
2864 &buffer[offset], msize);
2871 * We received an encrypted message. Decrypt, validate and
2872 * pass on to the appropriate clients.
2875 handle_encrypted_message (struct Neighbour *n,
2876 const struct EncryptedMessage *m)
2878 size_t size = ntohs (m->header.size);
2880 struct EncryptedMessage *pt; /* plaintext */
2884 struct GNUNET_TIME_Absolute t;
2887 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2888 "Core service receives `%s' request from `%4s'.\n",
2889 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
2895 &m->sequence_number,
2896 &buf[ENCRYPTED_HEADER_SIZE], size - ENCRYPTED_HEADER_SIZE))
2898 pt = (struct EncryptedMessage *) buf;
2901 GNUNET_CRYPTO_hash (&pt->sequence_number,
2902 size - ENCRYPTED_HEADER_SIZE, &ph);
2903 if (0 != memcmp (&ph, &m->plaintext_hash, sizeof (GNUNET_HashCode)))
2905 /* checksum failed */
2906 GNUNET_break_op (0);
2910 /* validate sequence number */
2911 snum = ntohl (pt->sequence_number);
2912 if (n->last_sequence_number_received == snum)
2914 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2915 "Received duplicate message, ignoring.\n");
2916 /* duplicate, ignore */
2919 if ((n->last_sequence_number_received > snum) &&
2920 (n->last_sequence_number_received - snum > 32))
2922 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2923 "Received ancient out of sequence message, ignoring.\n");
2924 /* ancient out of sequence, ignore */
2927 if (n->last_sequence_number_received > snum)
2929 unsigned int rotbit =
2930 1 << (n->last_sequence_number_received - snum - 1);
2931 if ((n->last_packets_bitmap & rotbit) != 0)
2933 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2934 "Received duplicate message, ignoring.\n");
2935 /* duplicate, ignore */
2938 n->last_packets_bitmap |= rotbit;
2940 if (n->last_sequence_number_received < snum)
2942 n->last_packets_bitmap <<= (snum - n->last_sequence_number_received);
2943 n->last_sequence_number_received = snum;
2946 /* check timestamp */
2947 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
2948 if (GNUNET_TIME_absolute_get_duration (t).value > MAX_MESSAGE_AGE.value)
2950 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2952 ("Message received far too old (%llu ms). Content ignored.\n"),
2953 GNUNET_TIME_absolute_get_duration (t).value);
2957 /* process decrypted message(s) */
2958 update_window (GNUNET_YES,
2959 &n->available_send_window,
2960 &n->last_asw_update,
2962 n->bpm_out_external_limit = ntohl (pt->inbound_bpm_limit);
2963 n->bpm_out = GNUNET_MAX (n->bpm_out_external_limit,
2964 n->bpm_out_internal_limit);
2965 n->last_activity = GNUNET_TIME_absolute_get ();
2966 off = sizeof (struct EncryptedMessage);
2967 deliver_messages (n, buf, size, off);
2972 * Function called by the transport for each received message.
2974 * @param cls closure
2975 * @param peer (claimed) identity of the other peer
2976 * @param message the message
2977 * @param latency estimated latency for communicating with the
2978 * given peer (round-trip)
2979 * @param distance in overlay hops, as given by transport plugin
2982 handle_transport_receive (void *cls,
2983 const struct GNUNET_PeerIdentity *peer,
2984 const struct GNUNET_MessageHeader *message,
2985 struct GNUNET_TIME_Relative latency,
2986 unsigned int distance)
2988 struct Neighbour *n;
2989 struct GNUNET_TIME_Absolute now;
2995 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2996 "Received message of type %u from `%4s', demultiplexing.\n",
2997 ntohs (message->type), GNUNET_i2s (peer));
2999 n = find_neighbour (peer);
3001 n = create_neighbour (peer);
3004 n->last_latency = latency;
3005 n->last_distance = distance;
3006 up = (n->status == PEER_STATE_KEY_CONFIRMED);
3007 type = ntohs (message->type);
3008 size = ntohs (message->size);
3011 "Received message of type %u from `%4s'\n",
3017 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
3018 if (size != sizeof (struct SetKeyMessage))
3020 GNUNET_break_op (0);
3023 handle_set_key (n, (const struct SetKeyMessage *) message);
3025 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3026 if (size < sizeof (struct EncryptedMessage) +
3027 sizeof (struct GNUNET_MessageHeader))
3029 GNUNET_break_op (0);
3032 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3033 (n->status != PEER_STATE_KEY_CONFIRMED))
3035 GNUNET_break_op (0);
3038 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3040 case GNUNET_MESSAGE_TYPE_CORE_PING:
3041 if (size != sizeof (struct PingMessage))
3043 GNUNET_break_op (0);
3046 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3047 (n->status != PEER_STATE_KEY_CONFIRMED))
3050 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3051 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3052 "PING", GNUNET_i2s (&n->peer));
3054 GNUNET_free_non_null (n->pending_ping);
3055 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3056 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3059 handle_ping (n, (const struct PingMessage *) message);
3061 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3062 if (size != sizeof (struct PingMessage))
3064 GNUNET_break_op (0);
3067 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3068 (n->status != PEER_STATE_KEY_CONFIRMED) )
3071 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3072 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3073 "PONG", GNUNET_i2s (&n->peer));
3075 GNUNET_free_non_null (n->pending_pong);
3076 n->pending_pong = GNUNET_malloc (sizeof (struct PingMessage));
3077 memcpy (n->pending_pong, message, sizeof (struct PingMessage));
3080 handle_pong (n, (const struct PingMessage *) message);
3083 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3084 _("Unsupported message of type %u received.\n"), type);
3087 if (n->status == PEER_STATE_KEY_CONFIRMED)
3089 now = GNUNET_TIME_absolute_get ();
3090 n->last_activity = now;
3092 n->time_established = now;
3098 * Function that recalculates the bandwidth quota for the
3099 * given neighbour and transmits it to the transport service.
3101 * @param cls neighbour for the quota update
3105 neighbour_quota_update (void *cls,
3106 const struct GNUNET_SCHEDULER_TaskContext *tc)
3108 struct Neighbour *n = cls;
3112 unsigned long long distributable;
3114 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
3115 /* calculate relative preference among all neighbours;
3116 divides by a bit more to avoid division by zero AND to
3117 account for possibility of new neighbours joining any time
3118 AND to convert to double... */
3119 pref_rel = n->current_preference / (1.0 + preference_sum);
3121 if (bandwidth_target_out > neighbour_count * MIN_BPM_PER_PEER)
3122 distributable = bandwidth_target_out - neighbour_count * MIN_BPM_PER_PEER;
3123 share = distributable * pref_rel;
3124 q_in = MIN_BPM_PER_PEER + (unsigned long long) share;
3125 /* check if we want to disconnect for good due to inactivity */
3126 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) &&
3127 (GNUNET_TIME_absolute_get_duration (n->time_established).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) )
3130 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3131 "Forcing disconnect of `%4s' due to inactivity (?).\n",
3132 GNUNET_i2s (&n->peer));
3134 q_in = 0; /* force disconnect */
3136 if ( (n->bpm_in + MIN_BPM_CHANGE < q_in) ||
3137 (n->bpm_in - MIN_BPM_CHANGE > q_in) )
3140 GNUNET_TRANSPORT_set_quota (transport,
3144 GNUNET_TIME_UNIT_FOREVER_REL,
3147 schedule_quota_update (n);
3152 * Function called by transport to notify us that
3153 * a peer connected to us (on the network level).
3155 * @param cls closure
3156 * @param peer the peer that connected
3157 * @param latency current latency of the connection
3158 * @param distance in overlay hops, as given by transport plugin
3161 handle_transport_notify_connect (void *cls,
3162 const struct GNUNET_PeerIdentity *peer,
3163 struct GNUNET_TIME_Relative latency,
3164 unsigned int distance)
3166 struct Neighbour *n;
3167 struct GNUNET_TIME_Absolute now;
3168 struct ConnectNotifyMessage cnm;
3170 n = find_neighbour (peer);
3173 if (n->is_connected)
3175 /* duplicate connect notification!? */
3182 n = create_neighbour (peer);
3184 now = GNUNET_TIME_absolute_get ();
3185 n->is_connected = GNUNET_YES;
3186 n->last_latency = latency;
3187 n->last_distance = distance;
3188 n->last_asw_update = now;
3189 n->last_arw_update = now;
3191 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3192 "Received connection from `%4s'.\n",
3193 GNUNET_i2s (&n->peer));
3195 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
3196 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_PRE_CONNECT);
3197 cnm.distance = htonl (n->last_distance);
3198 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
3200 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_PRE_CONNECT);
3206 * Function called by transport telling us that a peer
3209 * @param cls closure
3210 * @param peer the peer that disconnected
3213 handle_transport_notify_disconnect (void *cls,
3214 const struct GNUNET_PeerIdentity *peer)
3216 struct DisconnectNotifyMessage cnm;
3217 struct Neighbour *n;
3220 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3221 "Peer `%4s' disconnected from us.\n", GNUNET_i2s (peer));
3223 n = find_neighbour (peer);
3229 GNUNET_break (n->is_connected);
3230 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
3231 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
3233 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
3234 n->is_connected = GNUNET_NO;
3239 * Last task run during shutdown. Disconnects us from
3243 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3245 struct Neighbour *n;
3249 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3250 "Core service shutting down.\n");
3252 GNUNET_assert (transport != NULL);
3253 GNUNET_TRANSPORT_disconnect (transport);
3255 while (NULL != (n = neighbours))
3257 neighbours = n->next;
3258 GNUNET_assert (neighbour_count > 0);
3262 GNUNET_SERVER_notification_context_destroy (notifier);
3264 while (NULL != (c = clients))
3265 handle_client_disconnect (NULL, c->client_handle);
3266 if (my_private_key != NULL)
3267 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3272 * Initiate core service.
3274 * @param cls closure
3275 * @param s scheduler to use
3276 * @param serv the initialized server
3277 * @param c configuration to use
3281 struct GNUNET_SCHEDULER_Handle *s,
3282 struct GNUNET_SERVER_Handle *serv,
3283 const struct GNUNET_CONFIGURATION_Handle *c)
3286 unsigned long long qin;
3287 unsigned long long qout;
3288 unsigned long long tneigh;
3294 /* parse configuration */
3297 GNUNET_CONFIGURATION_get_value_number (c,
3300 &bandwidth_target_in)) ||
3302 GNUNET_CONFIGURATION_get_value_number (c,
3305 &bandwidth_target_out)) ||
3307 GNUNET_CONFIGURATION_get_value_filename (c,
3309 "HOSTKEY", &keyfile)))
3311 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3313 ("Core service is lacking key configuration settings. Exiting.\n"));
3314 GNUNET_SCHEDULER_shutdown (s);
3317 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3318 GNUNET_free (keyfile);
3319 if (my_private_key == NULL)
3321 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3322 _("Core service could not access hostkey. Exiting.\n"));
3323 GNUNET_SCHEDULER_shutdown (s);
3326 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3327 GNUNET_CRYPTO_hash (&my_public_key,
3328 sizeof (my_public_key), &my_identity.hashPubKey);
3329 /* setup notification */
3331 notifier = GNUNET_SERVER_notification_context_create (server,
3333 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
3334 /* setup transport connection */
3335 transport = GNUNET_TRANSPORT_connect (sched,
3338 &handle_transport_receive,
3339 &handle_transport_notify_connect,
3340 &handle_transport_notify_disconnect);
3341 GNUNET_assert (NULL != transport);
3342 GNUNET_SCHEDULER_add_delayed (sched,
3343 GNUNET_TIME_UNIT_FOREVER_REL,
3344 &cleaning_task, NULL);
3345 /* process client requests */
3346 GNUNET_SERVER_add_handlers (server, handlers);
3347 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3348 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
3354 * The main function for the transport service.
3356 * @param argc number of arguments from the command line
3357 * @param argv command line arguments
3358 * @return 0 ok, 1 on error
3361 main (int argc, char *const *argv)
3363 return (GNUNET_OK ==
3364 GNUNET_SERVICE_run (argc,
3367 GNUNET_SERVICE_OPTION_NONE,
3368 &run, NULL)) ? 0 : 1;
3371 /* end of gnunet-service-core.c */