2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file core/gnunet-service-core.c
23 * @brief high-level P2P messaging
24 * @author Christian Grothoff
26 * Considerations for later:
27 * - check that hostkey used by transport (for HELLOs) is the
28 * same as the hostkey that we are using!
29 * - add code to send PINGs if we are about to time-out otherwise
30 * - optimize lookup (many O(n) list traversals
31 * could ideally be changed to O(1) hash map lookups)
34 #include "gnunet_constants.h"
35 #include "gnunet_util_lib.h"
36 #include "gnunet_hello_lib.h"
37 #include "gnunet_peerinfo_service.h"
38 #include "gnunet_protocols.h"
39 #include "gnunet_signatures.h"
40 #include "gnunet_transport_service.h"
44 #define DEBUG_HANDSHAKE GNUNET_NO
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 linked list (for now).
301 struct MessageEntry *next;
304 * By when are we supposed to transmit this message?
306 struct GNUNET_TIME_Absolute deadline;
309 * How important is this message to us?
311 unsigned int priority;
314 * How long is the message? (number of bytes following
315 * the "struct MessageEntry", but not including the
316 * size of "struct MessageEntry" itself!)
321 * Was this message selected for transmission in the
322 * current round? GNUNET_YES or GNUNET_NO.
327 * Did we give this message some slack (delayed sending) previously
328 * (and hence should not give it any more slack)? GNUNET_YES or
339 * We keep neighbours in a linked list (for now).
341 struct Neighbour *next;
344 * Unencrypted messages destined for this peer.
346 struct MessageEntry *messages;
349 * Head of the batched, encrypted message queue (already ordered,
350 * transmit starting with the head).
352 struct MessageEntry *encrypted_head;
355 * Tail of the batched, encrypted message queue (already ordered,
356 * append new messages to tail)
358 struct MessageEntry *encrypted_tail;
361 * Handle for pending requests for transmission to this peer
362 * with the transport service. NULL if no request is pending.
364 struct GNUNET_TRANSPORT_TransmitHandle *th;
367 * Public key of the neighbour, NULL if we don't have it yet.
369 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
372 * We received a PING message before we got the "public_key"
373 * (or the SET_KEY). We keep it here until we have a key
374 * to decrypt it. NULL if no PING is pending.
376 struct PingMessage *pending_ping;
379 * We received a PONG message before we got the "public_key"
380 * (or the SET_KEY). We keep it here until we have a key
381 * to decrypt it. NULL if no PONG is pending.
383 struct PingMessage *pending_pong;
386 * Non-NULL if we are currently looking up HELLOs for this peer.
389 struct GNUNET_PEERINFO_IteratorContext *pitr;
392 * SetKeyMessage to transmit, NULL if we are not currently trying
395 struct SetKeyMessage *skm;
398 * Identity of the neighbour.
400 struct GNUNET_PeerIdentity peer;
403 * Key we use to encrypt our messages for the other peer
404 * (initialized by us when we do the handshake).
406 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
409 * Key we use to decrypt messages from the other peer
410 * (given to us by the other peer during the handshake).
412 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
415 * ID of task used for re-trying plaintext scheduling.
417 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
420 * ID of task used for re-trying SET_KEY and PING message.
422 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
425 * ID of task used for updating bandwidth quota for this neighbour.
427 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
430 * ID of task used for cleaning up dead neighbour entries.
432 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
435 * At what time did we generate our encryption key?
437 struct GNUNET_TIME_Absolute encrypt_key_created;
440 * At what time did the other peer generate the decryption key?
442 struct GNUNET_TIME_Absolute decrypt_key_created;
445 * At what time did we initially establish (as in, complete session
446 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
448 struct GNUNET_TIME_Absolute time_established;
451 * At what time did we last receive an encrypted message from the
452 * other peer? Should be zero if status != KEY_CONFIRMED.
454 struct GNUNET_TIME_Absolute last_activity;
457 * Last latency observed from this peer.
459 struct GNUNET_TIME_Relative last_latency;
462 * At what frequency are we currently re-trying SET_KEY messages?
464 struct GNUNET_TIME_Relative set_key_retry_frequency;
467 * Time of our last update to the "available_send_window".
469 struct GNUNET_TIME_Absolute last_asw_update;
472 * Time of our last update to the "available_recv_window".
474 struct GNUNET_TIME_Absolute last_arw_update;
477 * Number of bytes that we are eligible to transmit to this
478 * peer at this point. Incremented every minute by max_out_bpm,
479 * bounded by max_bpm (no back-log larger than MAX_BUF_FACT minutes,
480 * bandwidth-hogs are sampled at a frequency of about 78s!);
481 * may get negative if we have VERY high priority content.
483 long long available_send_window;
486 * How much downstream capacity of this peer has been reserved for
487 * our traffic? (Our clients can request that a certain amount of
488 * bandwidth is available for replies to them; this value is used to
489 * make sure that this reserved amount of bandwidth is actually
492 long long available_recv_window;
495 * How valueable were the messages of this peer recently?
497 unsigned long long current_preference;
500 * Bit map indicating which of the 32 sequence numbers before the last
501 * were received (good for accepting out-of-order packets and
502 * estimating reliability of the connection)
504 unsigned int last_packets_bitmap;
507 * Number of messages in the message queue for this peer.
509 unsigned int message_queue_size;
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 n->encrypted_head = m->next;
1033 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1034 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1035 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1036 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1037 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
1038 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1039 GNUNET_SCHEDULER_cancel (sched, n->quota_update_task);
1040 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1041 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1042 GNUNET_free_non_null (n->public_key);
1043 GNUNET_free_non_null (n->pending_ping);
1044 GNUNET_free_non_null (n->pending_pong);
1050 * Consider freeing the given neighbour since we may not need
1051 * to keep it around anymore.
1053 * @param n neighbour to consider discarding
1056 consider_free_neighbour (struct Neighbour *n);
1060 * Task triggered when a neighbour entry might have gotten stale.
1062 * @param cls the 'struct Neighbour'
1063 * @param tc scheduler context (not used)
1066 consider_free_task (void *cls,
1067 const struct GNUNET_SCHEDULER_TaskContext *tc)
1069 struct Neighbour *n = cls;
1070 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1071 consider_free_neighbour (n);
1076 * Consider freeing the given neighbour since we may not need
1077 * to keep it around anymore.
1079 * @param n neighbour to consider discarding
1082 consider_free_neighbour (struct Neighbour *n)
1084 struct Neighbour *pos;
1085 struct Neighbour *prev;
1086 struct GNUNET_TIME_Relative left;
1088 if ( (n->th != NULL) ||
1089 (n->pitr != NULL) ||
1090 (n->status == PEER_STATE_KEY_CONFIRMED) ||
1091 (GNUNET_YES == n->is_connected) )
1092 return; /* no chance */
1094 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1098 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1099 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1100 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
1102 &consider_free_task,
1106 /* actually free the neighbour... */
1115 neighbours = n->next;
1117 prev->next = n->next;
1118 GNUNET_assert (neighbour_count > 0);
1125 * Check if we have encrypted messages for the specified neighbour
1126 * pending, and if so, check with the transport about sending them
1129 * @param n neighbour to check.
1131 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1135 * Function called when the transport service is ready to
1136 * receive an encrypted message for the respective peer
1138 * @param cls neighbour to use message from
1139 * @param size number of bytes we can transmit
1140 * @param buf where to copy the message
1141 * @return number of bytes transmitted
1144 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1146 struct Neighbour *n = cls;
1147 struct MessageEntry *m;
1152 GNUNET_assert (NULL != (m = n->encrypted_head));
1153 n->encrypted_head = m->next;
1154 if (m->next == NULL)
1155 n->encrypted_tail = NULL;
1160 GNUNET_assert (size >= m->size);
1161 memcpy (cbuf, &m[1], m->size);
1163 n->available_send_window -= m->size;
1164 process_encrypted_neighbour_queue (n);
1167 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1168 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1169 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1170 ret, GNUNET_i2s (&n->peer));
1175 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1176 "Transmission of message of type %u and size %u failed\n",
1177 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1181 consider_free_neighbour (n);
1187 * Check if we have plaintext messages for the specified neighbour
1188 * pending, and if so, consider batching and encrypting them (and
1189 * then trigger processing of the encrypted queue if needed).
1191 * @param n neighbour to check.
1193 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1197 * Check if we have encrypted messages for the specified neighbour
1198 * pending, and if so, check with the transport about sending them
1201 * @param n neighbour to check.
1204 process_encrypted_neighbour_queue (struct Neighbour *n)
1206 struct MessageEntry *m;
1209 return; /* request already pending */
1210 if (n->encrypted_head == NULL)
1212 /* encrypted queue empty, try plaintext instead */
1213 process_plaintext_neighbour_queue (n);
1217 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1218 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1219 n->encrypted_head->size,
1220 GNUNET_i2s (&n->peer),
1221 GNUNET_TIME_absolute_get_remaining (n->
1222 encrypted_head->deadline).
1226 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1227 n->encrypted_head->size,
1228 n->encrypted_head->priority,
1229 GNUNET_TIME_absolute_get_remaining
1230 (n->encrypted_head->deadline),
1231 ¬ify_encrypted_transmit_ready,
1235 /* message request too large or duplicate request */
1237 /* discard encrypted message */
1238 GNUNET_assert (NULL != (m = n->encrypted_head));
1239 n->encrypted_head = m->next;
1240 if (m->next == NULL)
1241 n->encrypted_tail = NULL;
1243 process_encrypted_neighbour_queue (n);
1249 * Decrypt size bytes from in and write the result to out. Use the
1250 * key for inbound traffic of the given neighbour. This function does
1251 * NOT do any integrity-checks on the result.
1253 * @param n neighbour we are receiving from
1254 * @param iv initialization vector to use
1255 * @param in ciphertext
1256 * @param out plaintext
1257 * @param size size of in/out
1258 * @return GNUNET_OK on success
1261 do_decrypt (struct Neighbour *n,
1262 const GNUNET_HashCode * iv,
1263 const void *in, void *out, size_t size)
1265 if (size != (uint16_t) size)
1270 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1271 (n->status != PEER_STATE_KEY_CONFIRMED))
1273 GNUNET_break_op (0);
1274 return GNUNET_SYSERR;
1277 GNUNET_CRYPTO_aes_decrypt (in,
1281 GNUNET_CRYPTO_AesInitializationVector *) iv,
1285 return GNUNET_SYSERR;
1288 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1289 "Decrypted %u bytes from `%4s' using key %u\n",
1290 size, GNUNET_i2s (&n->peer), n->decrypt_key.crc32);
1297 * Encrypt size bytes from in and write the result to out. Use the
1298 * key for outbound traffic of the given neighbour.
1300 * @param n neighbour we are sending to
1301 * @param iv initialization vector to use
1302 * @param in ciphertext
1303 * @param out plaintext
1304 * @param size size of in/out
1305 * @return GNUNET_OK on success
1308 do_encrypt (struct Neighbour *n,
1309 const GNUNET_HashCode * iv,
1310 const void *in, void *out, size_t size)
1312 if (size != (uint16_t) size)
1317 GNUNET_assert (size ==
1318 GNUNET_CRYPTO_aes_encrypt (in,
1322 GNUNET_CRYPTO_AesInitializationVector
1325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1326 "Encrypted %u bytes for `%4s' using key %u\n", size,
1327 GNUNET_i2s (&n->peer), n->encrypt_key.crc32);
1334 * Select messages for transmission. This heuristic uses a combination
1335 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1336 * and priority-based discard (in case no feasible schedule exist) and
1337 * speculative optimization (defer any kind of transmission until
1338 * we either create a batch of significant size, 25% of max, or until
1339 * we are close to a deadline). Furthermore, when scheduling the
1340 * heuristic also packs as many messages into the batch as possible,
1341 * starting with those with the earliest deadline. Yes, this is fun.
1343 * @param n neighbour to select messages from
1344 * @param size number of bytes to select for transmission
1345 * @param retry_time set to the time when we should try again
1346 * (only valid if this function returns zero)
1347 * @return number of bytes selected, or 0 if we decided to
1348 * defer scheduling overall; in that case, retry_time is set.
1351 select_messages (struct Neighbour *n,
1352 size_t size, struct GNUNET_TIME_Relative *retry_time)
1354 struct MessageEntry *pos;
1355 struct MessageEntry *min;
1356 struct MessageEntry *last;
1357 unsigned int min_prio;
1358 struct GNUNET_TIME_Absolute t;
1359 struct GNUNET_TIME_Absolute now;
1362 unsigned long long slack; /* how long could we wait before missing deadlines? */
1364 int discard_low_prio;
1366 GNUNET_assert (NULL != n->messages);
1367 now = GNUNET_TIME_absolute_get ();
1368 /* last entry in linked list of messages processed */
1370 /* should we remove the entry with the lowest
1371 priority from consideration for scheduling at the
1373 discard_low_prio = GNUNET_YES;
1374 while (GNUNET_YES == discard_low_prio)
1378 discard_low_prio = GNUNET_NO;
1379 /* calculate number of bytes available for transmission at time "t" */
1380 update_window (GNUNET_NO,
1381 &n->available_send_window,
1382 &n->last_asw_update,
1384 avail = n->available_send_window;
1385 t = n->last_asw_update;
1386 /* how many bytes have we (hypothetically) scheduled so far */
1388 /* maximum time we can wait before transmitting anything
1389 and still make all of our deadlines */
1393 /* note that we use "*2" here because we want to look
1394 a bit further into the future; much more makes no
1395 sense since new message might be scheduled in the
1397 while ((pos != NULL) && (off < size * 2))
1399 if (pos->do_transmit == GNUNET_YES)
1401 /* already removed from consideration */
1405 if (discard_low_prio == GNUNET_NO)
1407 delta = pos->deadline.value;
1408 if (delta < t.value)
1411 delta = t.value - delta;
1412 avail += delta * n->bpm_out / 1000 / 60;
1413 if (avail < pos->size)
1415 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1420 /* update slack, considering both its absolute deadline
1421 and relative deadlines caused by other messages
1422 with their respective load */
1423 slack = GNUNET_MIN (slack, avail / n->bpm_out);
1424 if ( (pos->deadline.value < now.value) ||
1425 (GNUNET_YES == pos->got_slack) )
1432 GNUNET_MIN (slack, pos->deadline.value - now.value);
1433 pos->got_slack = GNUNET_YES;
1439 t.value = GNUNET_MAX (pos->deadline.value, t.value);
1440 if (pos->priority <= min_prio)
1442 /* update min for discard */
1443 min_prio = pos->priority;
1448 if (discard_low_prio)
1450 GNUNET_assert (min != NULL);
1451 /* remove lowest-priority entry from consideration */
1452 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1456 /* guard against sending "tiny" messages with large headers without
1458 if ( (slack > 1000) && (size > 4 * off) )
1460 /* less than 25% of message would be filled with deadlines still
1461 being met if we delay by one second or more; so just wait for
1462 more data; but do not wait longer than 1s (since we don't want
1463 to delay messages for a really long time either). */
1464 retry_time->value = 1000;
1465 /* reset do_transmit values for next time */
1468 pos->do_transmit = GNUNET_NO;
1472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1473 "Deferring transmission for 1s due to underfull message buffer size\n");
1477 /* select marked messages (up to size) for transmission */
1482 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
1484 pos->do_transmit = GNUNET_YES; /* mark for transmission */
1489 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
1493 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1494 "Selected %u bytes of plaintext messages for transmission to `%4s'.\n",
1495 off, GNUNET_i2s (&n->peer));
1502 * Batch multiple messages into a larger buffer.
1504 * @param n neighbour to take messages from
1505 * @param buf target buffer
1506 * @param size size of buf
1507 * @param deadline set to transmission deadline for the result
1508 * @param retry_time set to the time when we should try again
1509 * (only valid if this function returns zero)
1510 * @param priority set to the priority of the batch
1511 * @return number of bytes written to buf (can be zero)
1514 batch_message (struct Neighbour *n,
1517 struct GNUNET_TIME_Absolute *deadline,
1518 struct GNUNET_TIME_Relative *retry_time,
1519 unsigned int *priority)
1521 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE];
1522 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
1523 struct MessageEntry *pos;
1524 struct MessageEntry *prev;
1525 struct MessageEntry *next;
1530 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1531 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
1532 if (0 == select_messages (n, size, retry_time))
1534 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1535 "No messages selected, will try again in %llu ms\n",
1539 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
1540 ntm->distance = htonl (n->last_distance);
1541 ntm->latency = GNUNET_TIME_relative_hton (n->last_latency);
1542 ntm->peer = n->peer;
1546 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
1549 if (GNUNET_YES == pos->do_transmit)
1551 GNUNET_assert (pos->size <= size);
1552 /* do notifications */
1553 /* FIXME: track if we have *any* client that wants
1554 full notifications and only do this if that is
1556 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
1558 memcpy (&ntm[1], &pos[1], pos->size);
1559 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1560 sizeof (struct GNUNET_MessageHeader));
1561 send_to_all_clients (&ntm->header,
1563 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
1567 /* message too large for 'full' notifications, we do at
1568 least the 'hdr' type */
1571 sizeof (struct GNUNET_MessageHeader));
1573 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1575 send_to_all_clients (&ntm->header,
1577 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
1580 "Encrypting message of type %u\n",
1581 ntohs(((struct GNUNET_MessageHeader*)&pos[1])->type));
1583 /* copy for encrypted transmission */
1584 memcpy (&buf[ret], &pos[1], pos->size);
1587 *priority += pos->priority;
1589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1590 "Adding plaintext message with deadline %llu ms to batch\n",
1591 GNUNET_TIME_absolute_get_remaining (pos->deadline).value);
1593 deadline->value = GNUNET_MIN (deadline->value, pos->deadline.value);
1607 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1608 "Deadline for message batch is %llu ms\n",
1609 GNUNET_TIME_absolute_get_remaining (*deadline).value);
1616 * Remove messages with deadlines that have long expired from
1619 * @param n neighbour to inspect
1622 discard_expired_messages (struct Neighbour *n)
1624 struct MessageEntry *prev;
1625 struct MessageEntry *next;
1626 struct MessageEntry *pos;
1627 struct GNUNET_TIME_Absolute now;
1628 struct GNUNET_TIME_Relative delta;
1630 now = GNUNET_TIME_absolute_get ();
1636 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
1637 if (delta.value > PAST_EXPIRATION_DISCARD_TIME.value)
1640 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1641 "Message is %llu ms past due, discarding.\n",
1658 * Signature of the main function of a task.
1660 * @param cls closure
1661 * @param tc context information (why was this task triggered now)
1664 retry_plaintext_processing (void *cls,
1665 const struct GNUNET_SCHEDULER_TaskContext *tc)
1667 struct Neighbour *n = cls;
1669 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1670 process_plaintext_neighbour_queue (n);
1675 * Send our key (and encrypted PING) to the other peer.
1677 * @param n the other peer
1679 static void send_key (struct Neighbour *n);
1682 * Task that will retry "send_key" if our previous attempt failed
1686 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1688 struct Neighbour *n = cls;
1690 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
1691 n->set_key_retry_frequency =
1692 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
1698 * Check if we have plaintext messages for the specified neighbour
1699 * pending, and if so, consider batching and encrypting them (and
1700 * then trigger processing of the encrypted queue if needed).
1702 * @param n neighbour to check.
1705 process_plaintext_neighbour_queue (struct Neighbour *n)
1707 char pbuf[MAX_ENCRYPTED_MESSAGE_SIZE]; /* plaintext */
1710 struct EncryptedMessage *em; /* encrypted message */
1711 struct EncryptedMessage *ph; /* plaintext header */
1712 struct MessageEntry *me;
1713 unsigned int priority;
1714 struct GNUNET_TIME_Absolute deadline;
1715 struct GNUNET_TIME_Relative retry_time;
1717 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1719 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1720 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1724 case PEER_STATE_DOWN:
1727 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1728 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1729 GNUNET_i2s(&n->peer));
1732 case PEER_STATE_KEY_SENT:
1733 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1734 n->retry_set_key_task
1735 = GNUNET_SCHEDULER_add_delayed (sched,
1736 n->set_key_retry_frequency,
1737 &set_key_retry_task, n);
1739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1740 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1741 GNUNET_i2s(&n->peer));
1744 case PEER_STATE_KEY_RECEIVED:
1745 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1746 n->retry_set_key_task
1747 = GNUNET_SCHEDULER_add_delayed (sched,
1748 n->set_key_retry_frequency,
1749 &set_key_retry_task, n);
1751 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1752 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1753 GNUNET_i2s(&n->peer));
1756 case PEER_STATE_KEY_CONFIRMED:
1757 /* ready to continue */
1760 discard_expired_messages (n);
1761 if (n->messages == NULL)
1764 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1765 "Plaintext message queue for `%4s' is empty.\n",
1766 GNUNET_i2s(&n->peer));
1768 return; /* no pending messages */
1770 if (n->encrypted_head != NULL)
1773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1774 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
1775 GNUNET_i2s(&n->peer));
1777 return; /* wait for messages already encrypted to be
1780 ph = (struct EncryptedMessage *) pbuf;
1781 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1783 used = sizeof (struct EncryptedMessage);
1784 used += batch_message (n,
1786 MAX_ENCRYPTED_MESSAGE_SIZE - used,
1787 &deadline, &retry_time, &priority);
1788 if (used == sizeof (struct EncryptedMessage))
1791 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1792 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
1793 GNUNET_i2s(&n->peer));
1795 /* no messages selected for sending, try again later... */
1796 n->retry_plaintext_task =
1797 GNUNET_SCHEDULER_add_delayed (sched,
1799 &retry_plaintext_processing, n);
1802 ph->sequence_number = htonl (++n->last_sequence_number_sent);
1803 ph->inbound_bpm_limit = htonl (n->bpm_in);
1804 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1806 /* setup encryption message header */
1807 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
1808 me->deadline = deadline;
1809 me->priority = priority;
1811 em = (struct EncryptedMessage *) &me[1];
1812 em->header.size = htons (used);
1813 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
1814 em->reserved = htonl (0);
1815 esize = used - ENCRYPTED_HEADER_SIZE;
1816 GNUNET_CRYPTO_hash (&ph->sequence_number, esize, &em->plaintext_hash);
1819 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1820 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
1822 GNUNET_i2s(&n->peer),
1823 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).value);
1825 GNUNET_assert (GNUNET_OK ==
1827 &em->plaintext_hash,
1828 &ph->sequence_number,
1829 &em->sequence_number, esize));
1830 /* append to transmission list */
1831 if (n->encrypted_tail == NULL)
1832 n->encrypted_head = me;
1834 n->encrypted_tail->next = me;
1835 n->encrypted_tail = me;
1836 process_encrypted_neighbour_queue (n);
1841 * Function that recalculates the bandwidth quota for the
1842 * given neighbour and transmits it to the transport service.
1844 * @param cls neighbour for the quota update
1848 neighbour_quota_update (void *cls,
1849 const struct GNUNET_SCHEDULER_TaskContext *tc);
1853 * Schedule the task that will recalculate the bandwidth
1854 * quota for this peer (and possibly force a disconnect of
1855 * idle peers by calculating a bandwidth of zero).
1858 schedule_quota_update (struct Neighbour *n)
1860 GNUNET_assert (n->quota_update_task ==
1861 GNUNET_SCHEDULER_NO_TASK);
1862 n->quota_update_task
1863 = GNUNET_SCHEDULER_add_delayed (sched,
1864 QUOTA_UPDATE_FREQUENCY,
1865 &neighbour_quota_update,
1871 * Initialize a new 'struct Neighbour'.
1873 * @param pid ID of the new neighbour
1874 * @return handle for the new neighbour
1876 static struct Neighbour *
1877 create_neighbour (const struct GNUNET_PeerIdentity *pid)
1879 struct Neighbour *n;
1880 struct GNUNET_TIME_Absolute now;
1882 n = GNUNET_malloc (sizeof (struct Neighbour));
1883 n->next = neighbours;
1887 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
1888 now = GNUNET_TIME_absolute_get ();
1889 n->encrypt_key_created = now;
1890 n->last_activity = now;
1891 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
1892 n->bpm_in = GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT;
1893 n->bpm_out = GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT;
1894 n->bpm_out_internal_limit = (uint32_t) - 1;
1895 n->bpm_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT;
1896 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1898 schedule_quota_update (n);
1907 * Handle CORE_SEND request.
1910 * @param client the client issuing the request
1911 * @param message the "struct SendMessage"
1914 handle_client_send (void *cls,
1915 struct GNUNET_SERVER_Client *client,
1916 const struct GNUNET_MessageHeader *message)
1918 const struct SendMessage *sm;
1919 const struct GNUNET_MessageHeader *mh;
1920 struct Neighbour *n;
1921 struct MessageEntry *prev;
1922 struct MessageEntry *pos;
1923 struct MessageEntry *e;
1924 struct MessageEntry *min_prio_entry;
1925 struct MessageEntry *min_prio_prev;
1926 unsigned int min_prio;
1927 unsigned int queue_size;
1930 msize = ntohs (message->size);
1932 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
1936 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1939 sm = (const struct SendMessage *) message;
1940 msize -= sizeof (struct SendMessage);
1941 mh = (const struct GNUNET_MessageHeader *) &sm[1];
1942 if (msize != ntohs (mh->size))
1946 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1949 n = find_neighbour (&sm->peer);
1951 n = create_neighbour (&sm->peer);
1953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1954 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
1957 GNUNET_i2s (&sm->peer));
1959 /* bound queue size */
1960 discard_expired_messages (n);
1961 min_prio = (unsigned int) -1;
1962 min_prio_entry = NULL;
1963 min_prio_prev = NULL;
1969 if (pos->priority < min_prio)
1971 min_prio_entry = pos;
1972 min_prio_prev = prev;
1973 min_prio = pos->priority;
1979 if (queue_size >= MAX_PEER_QUEUE_SIZE)
1982 if (ntohl(sm->priority) <= min_prio)
1984 /* discard new entry */
1986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1987 "Queue full, discarding new request\n");
1990 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1993 /* discard "min_prio_entry" */
1995 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1996 "Queue full, discarding existing older request\n");
1998 if (min_prio_prev == NULL)
1999 n->messages = min_prio_entry->next;
2001 min_prio_prev->next = min_prio_entry->next;
2002 GNUNET_free (min_prio_entry);
2006 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2007 "Adding transmission request for `%4s' to queue\n",
2008 GNUNET_i2s (&sm->peer));
2010 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2011 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2012 e->priority = ntohl (sm->priority);
2014 memcpy (&e[1], mh, msize);
2016 /* insert, keep list sorted by deadline */
2019 while ((pos != NULL) && (pos->deadline.value < e->deadline.value))
2030 /* consider scheduling now */
2031 process_plaintext_neighbour_queue (n);
2033 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2038 * Handle CORE_REQUEST_CONNECT request.
2041 * @param client the client issuing the request
2042 * @param message the "struct ConnectMessage"
2045 handle_client_request_connect (void *cls,
2046 struct GNUNET_SERVER_Client *client,
2047 const struct GNUNET_MessageHeader *message)
2049 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2050 struct Neighbour *n;
2052 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2053 n = find_neighbour (&cm->peer);
2055 n = create_neighbour (&cm->peer);
2056 if ( (n->is_connected) ||
2058 return; /* already connected, or at least trying */
2060 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2061 "Core received `%s' request for `%4s', will try to establish connection\n",
2063 GNUNET_i2s (&cm->peer));
2065 /* ask transport to connect to the peer */
2066 /* FIXME: timeout zero OK? */
2067 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2070 GNUNET_TIME_UNIT_ZERO,
2077 * List of handlers for the messages understood by this
2080 static struct GNUNET_SERVER_MessageHandler handlers[] = {
2081 {&handle_client_init, NULL,
2082 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
2083 {&handle_client_request_info, NULL,
2084 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
2085 sizeof (struct RequestInfoMessage)},
2086 {&handle_client_send, NULL,
2087 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
2088 {&handle_client_request_connect, NULL,
2089 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
2090 sizeof (struct ConnectMessage)},
2096 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2097 * the neighbour's struct and retry send_key. Or, if we did not get a
2098 * HELLO, just do nothing.
2100 * @param cls the 'struct Neighbour' to retry sending the key for
2101 * @param peer the peer for which this is the HELLO
2102 * @param hello HELLO message of that peer
2103 * @param trust amount of trust we currently have in that peer
2106 process_hello_retry_send_key (void *cls,
2107 const struct GNUNET_PeerIdentity *peer,
2108 const struct GNUNET_HELLO_Message *hello,
2111 struct Neighbour *n = cls;
2116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2117 "Entered `process_hello_retry_send_key' and `peer' is NULL!\n");
2120 if (n->public_key != NULL)
2126 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2127 n->retry_set_key_task
2128 = GNUNET_SCHEDULER_add_delayed (sched,
2129 n->set_key_retry_frequency,
2130 &set_key_retry_task, n);
2136 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2137 "Entered `process_hello_retry_send_key' for peer `%4s'\n",
2140 if (n->public_key != NULL)
2143 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2144 "already have public key for peer %s!! (so why are we here?)\n",
2151 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2152 "Received new `%s' message for `%4s', initiating key exchange.\n",
2157 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2158 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2160 GNUNET_free (n->public_key);
2161 n->public_key = NULL;
2163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2164 "GNUNET_HELLO_get_key returned awfully\n");
2172 * Send our key (and encrypted PING) to the other peer.
2174 * @param n the other peer
2177 send_key (struct Neighbour *n)
2179 struct SetKeyMessage *sm;
2180 struct MessageEntry *me;
2181 struct PingMessage pp;
2182 struct PingMessage *pm;
2184 if ( (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK) ||
2188 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2189 "Key exchange in progress with `%4s'.\n",
2190 GNUNET_i2s (&n->peer));
2192 return; /* already in progress */
2196 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2197 "Asked to perform key exchange with `%4s'.\n",
2198 GNUNET_i2s (&n->peer));
2200 if (n->public_key == NULL)
2202 /* lookup n's public key, then try again */
2204 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2205 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2206 GNUNET_i2s (&n->peer));
2208 GNUNET_assert (n->pitr == NULL);
2209 n->pitr = GNUNET_PEERINFO_iterate (cfg,
2213 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2214 &process_hello_retry_send_key, n);
2217 /* first, set key message */
2218 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2219 sizeof (struct SetKeyMessage));
2220 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
2221 me->priority = SET_KEY_PRIORITY;
2222 me->size = sizeof (struct SetKeyMessage);
2223 if (n->encrypted_head == NULL)
2224 n->encrypted_head = me;
2226 n->encrypted_tail->next = me;
2227 n->encrypted_tail = me;
2228 sm = (struct SetKeyMessage *) &me[1];
2229 sm->header.size = htons (sizeof (struct SetKeyMessage));
2230 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
2231 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
2232 PEER_STATE_KEY_SENT : n->status));
2234 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2235 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2236 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2237 sizeof (struct GNUNET_PeerIdentity));
2238 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
2239 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
2240 sm->target = n->peer;
2241 GNUNET_assert (GNUNET_OK ==
2242 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
2244 GNUNET_CRYPTO_AesSessionKey),
2246 &sm->encrypted_key));
2247 GNUNET_assert (GNUNET_OK ==
2248 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
2251 /* second, encrypted PING message */
2252 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2253 sizeof (struct PingMessage));
2254 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
2255 me->priority = PING_PRIORITY;
2256 me->size = sizeof (struct PingMessage);
2257 n->encrypted_tail->next = me;
2258 n->encrypted_tail = me;
2259 pm = (struct PingMessage *) &me[1];
2260 pm->header.size = htons (sizeof (struct PingMessage));
2261 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
2262 pp.challenge = htonl (n->ping_challenge);
2263 pp.target = n->peer;
2265 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2266 "Encrypting `%s' and `%s' messages for `%4s'.\n",
2267 "SET_KEY", "PING", GNUNET_i2s (&n->peer));
2268 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2269 "Sending `%s' to `%4s' with challenge %u encrypted using key %u\n",
2271 GNUNET_i2s (&n->peer), n->ping_challenge, n->encrypt_key.crc32);
2274 &n->peer.hashPubKey,
2277 sizeof (struct PingMessage) -
2278 sizeof (struct GNUNET_MessageHeader));
2282 case PEER_STATE_DOWN:
2283 n->status = PEER_STATE_KEY_SENT;
2285 case PEER_STATE_KEY_SENT:
2287 case PEER_STATE_KEY_RECEIVED:
2289 case PEER_STATE_KEY_CONFIRMED:
2296 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2297 "Have %llu ms left for `%s' transmission.\n",
2298 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).value,
2301 /* trigger queue processing */
2302 process_encrypted_neighbour_queue (n);
2303 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
2304 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
2305 n->retry_set_key_task
2306 = GNUNET_SCHEDULER_add_delayed (sched,
2307 n->set_key_retry_frequency,
2308 &set_key_retry_task, n);
2313 * We received a SET_KEY message. Validate and update
2314 * our key material and status.
2316 * @param n the neighbour from which we received message m
2317 * @param m the set key message we received
2320 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m);
2324 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2325 * the neighbour's struct and retry handling the set_key message. Or,
2326 * if we did not get a HELLO, just free the set key message.
2328 * @param cls pointer to the set key message
2329 * @param peer the peer for which this is the HELLO
2330 * @param hello HELLO message of that peer
2331 * @param trust amount of trust we currently have in that peer
2334 process_hello_retry_handle_set_key (void *cls,
2335 const struct GNUNET_PeerIdentity *peer,
2336 const struct GNUNET_HELLO_Message *hello,
2339 struct Neighbour *n = cls;
2340 struct SetKeyMessage *sm = n->skm;
2349 if (n->public_key != NULL)
2350 return; /* multiple HELLOs match!? */
2352 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2353 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2355 GNUNET_break_op (0);
2356 GNUNET_free (n->public_key);
2357 n->public_key = NULL;
2361 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2362 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
2363 "HELLO", GNUNET_i2s (peer), "SET_KEY");
2365 handle_set_key (n, sm);
2370 * We received a PING message. Validate and transmit
2373 * @param n sender of the PING
2374 * @param m the encrypted PING message itself
2377 handle_ping (struct Neighbour *n, const struct PingMessage *m)
2379 struct PingMessage t;
2380 struct PingMessage *tp;
2381 struct MessageEntry *me;
2384 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2385 "Core service receives `%s' request from `%4s'.\n",
2386 "PING", GNUNET_i2s (&n->peer));
2390 &my_identity.hashPubKey,
2393 sizeof (struct PingMessage) -
2394 sizeof (struct GNUNET_MessageHeader)))
2397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2398 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u\n",
2400 GNUNET_i2s (&t.target),
2401 ntohl (t.challenge), n->decrypt_key.crc32);
2402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2403 "Target of `%s' request is `%4s'.\n",
2404 "PING", GNUNET_i2s (&t.target));
2406 if (0 != memcmp (&t.target,
2407 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2409 GNUNET_break_op (0);
2412 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2413 sizeof (struct PingMessage));
2414 if (n->encrypted_tail != NULL)
2415 n->encrypted_tail->next = me;
2418 n->encrypted_tail = me;
2419 n->encrypted_head = me;
2421 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
2422 me->priority = PONG_PRIORITY;
2423 me->size = sizeof (struct PingMessage);
2424 tp = (struct PingMessage *) &me[1];
2425 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
2426 tp->header.size = htons (sizeof (struct PingMessage));
2428 &my_identity.hashPubKey,
2431 sizeof (struct PingMessage) -
2432 sizeof (struct GNUNET_MessageHeader));
2434 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2435 "Encrypting `%s' with challenge %u using key %u\n", "PONG",
2436 ntohl (t.challenge), n->encrypt_key.crc32);
2438 /* trigger queue processing */
2439 process_encrypted_neighbour_queue (n);
2444 * We received a PONG message. Validate and update our status.
2446 * @param n sender of the PONG
2447 * @param m the encrypted PONG message itself
2450 handle_pong (struct Neighbour *n, const struct PingMessage *m)
2452 struct PingMessage t;
2453 struct ConnectNotifyMessage cnm;
2456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2457 "Core service receives `%s' request from `%4s'.\n",
2458 "PONG", GNUNET_i2s (&n->peer));
2462 &n->peer.hashPubKey,
2465 sizeof (struct PingMessage) -
2466 sizeof (struct GNUNET_MessageHeader)))
2469 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2470 "Decrypted `%s' from `%4s' with challenge %u using key %u\n",
2472 GNUNET_i2s (&t.target),
2473 ntohl (t.challenge), n->decrypt_key.crc32);
2475 if ((0 != memcmp (&t.target,
2477 sizeof (struct GNUNET_PeerIdentity))) ||
2478 (n->ping_challenge != ntohl (t.challenge)))
2480 /* PONG malformed */
2482 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2483 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
2484 "PONG", GNUNET_i2s (&n->peer), n->ping_challenge);
2485 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2486 "Received malformed `%s' received from `%4s' with challenge %u\n",
2487 "PONG", GNUNET_i2s (&t.target), ntohl (t.challenge));
2489 GNUNET_break_op (0);
2494 case PEER_STATE_DOWN:
2495 GNUNET_break (0); /* should be impossible */
2497 case PEER_STATE_KEY_SENT:
2498 GNUNET_break (0); /* should be impossible, how did we decrypt? */
2500 case PEER_STATE_KEY_RECEIVED:
2501 n->status = PEER_STATE_KEY_CONFIRMED;
2503 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2504 "Confirmed key via `%s' message for peer `%4s'\n",
2505 "PONG", GNUNET_i2s (&n->peer));
2507 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2509 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2510 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2512 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
2513 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
2514 cnm.distance = htonl (n->last_distance);
2515 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
2517 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
2518 process_encrypted_neighbour_queue (n);
2520 case PEER_STATE_KEY_CONFIRMED:
2521 /* duplicate PONG? */
2531 * We received a SET_KEY message. Validate and update
2532 * our key material and status.
2534 * @param n the neighbour from which we received message m
2535 * @param m the set key message we received
2538 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
2540 struct SetKeyMessage *m_cpy;
2541 struct GNUNET_TIME_Absolute t;
2542 struct GNUNET_CRYPTO_AesSessionKey k;
2543 struct PingMessage *ping;
2544 struct PingMessage *pong;
2545 enum PeerStateMachine sender_status;
2548 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2549 "Core service receives `%s' request from `%4s'.\n",
2550 "SET_KEY", GNUNET_i2s (&n->peer));
2552 if (n->public_key == NULL)
2554 if (n->pitr != NULL)
2557 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2558 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
2564 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2565 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
2567 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
2568 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
2569 /* lookup n's public key, then try again */
2570 GNUNET_assert (n->skm == NULL);
2572 n->pitr = GNUNET_PEERINFO_iterate (cfg,
2576 GNUNET_TIME_UNIT_MINUTES,
2577 &process_hello_retry_handle_set_key, n);
2580 if (0 != memcmp (&m->target,
2582 sizeof (struct GNUNET_PeerIdentity)))
2584 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2585 _("Received `%s' message that was not for me. Ignoring.\n"),
2589 if ((ntohl (m->purpose.size) !=
2590 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2591 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2592 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2593 sizeof (struct GNUNET_PeerIdentity)) ||
2595 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
2596 &m->purpose, &m->signature, n->public_key)))
2598 /* invalid signature */
2599 GNUNET_break_op (0);
2602 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
2603 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
2604 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
2605 (t.value < n->decrypt_key_created.value))
2607 /* this could rarely happen due to massive re-ordering of
2608 messages on the network level, but is most likely either
2609 a bug or some adversary messing with us. Report. */
2610 GNUNET_break_op (0);
2614 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Decrypting key material.\n");
2616 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
2619 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
2620 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
2621 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
2623 /* failed to decrypt !? */
2624 GNUNET_break_op (0);
2629 if (n->decrypt_key_created.value != t.value)
2631 /* fresh key, reset sequence numbers */
2632 n->last_sequence_number_received = 0;
2633 n->last_packets_bitmap = 0;
2634 n->decrypt_key_created = t;
2636 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
2639 case PEER_STATE_DOWN:
2640 n->status = PEER_STATE_KEY_RECEIVED;
2642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2643 "Responding to `%s' with my own key.\n", "SET_KEY");
2647 case PEER_STATE_KEY_SENT:
2648 case PEER_STATE_KEY_RECEIVED:
2649 n->status = PEER_STATE_KEY_RECEIVED;
2650 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
2651 (sender_status != PEER_STATE_KEY_CONFIRMED))
2654 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2655 "Responding to `%s' with my own key (other peer has status %u).\n",
2656 "SET_KEY", sender_status);
2661 case PEER_STATE_KEY_CONFIRMED:
2662 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
2663 (sender_status != PEER_STATE_KEY_CONFIRMED))
2666 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2667 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
2668 "SET_KEY", sender_status);
2677 if (n->pending_ping != NULL)
2679 ping = n->pending_ping;
2680 n->pending_ping = NULL;
2681 handle_ping (n, ping);
2684 if (n->pending_pong != NULL)
2686 pong = n->pending_pong;
2687 n->pending_pong = NULL;
2688 handle_pong (n, pong);
2695 * Send a P2P message to a client.
2697 * @param sender who sent us the message?
2698 * @param client who should we give the message to?
2699 * @param m contains the message to transmit
2700 * @param msize number of bytes in buf to transmit
2703 send_p2p_message_to_client (struct Neighbour *sender,
2704 struct Client *client,
2705 const void *m, size_t msize)
2707 char buf[msize + sizeof (struct NotifyTrafficMessage)];
2708 struct NotifyTrafficMessage *ntm;
2711 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2712 "Core service passes message from `%4s' of type %u to client.\n",
2713 GNUNET_i2s(&sender->peer),
2714 ntohs (((const struct GNUNET_MessageHeader *) m)->type));
2716 ntm = (struct NotifyTrafficMessage *) buf;
2717 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
2718 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
2719 ntm->distance = htonl (sender->last_distance);
2720 ntm->latency = GNUNET_TIME_relative_hton (sender->last_latency);
2721 ntm->peer = sender->peer;
2722 memcpy (&ntm[1], m, msize);
2723 send_to_client (client, &ntm->header, GNUNET_YES);
2728 * Deliver P2P message to interested clients.
2730 * @param sender who sent us the message?
2731 * @param m the message
2732 * @param msize size of the message (including header)
2735 deliver_message (struct Neighbour *sender,
2736 const struct GNUNET_MessageHeader *m, size_t msize)
2738 struct Client *cpos;
2743 type = ntohs (m->type);
2746 "Received encapsulated message of type %u from `%4s'\n",
2748 GNUNET_i2s (&sender->peer));
2751 while (cpos != NULL)
2753 deliver_full = GNUNET_NO;
2754 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
2755 deliver_full = GNUNET_YES;
2758 for (tpos = 0; tpos < cpos->tcnt; tpos++)
2760 if (type != cpos->types[tpos])
2762 deliver_full = GNUNET_YES;
2766 if (GNUNET_YES == deliver_full)
2767 send_p2p_message_to_client (sender, cpos, m, msize);
2768 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
2769 send_p2p_message_to_client (sender, cpos, m,
2770 sizeof (struct GNUNET_MessageHeader));
2777 * Align P2P message and then deliver to interested clients.
2779 * @param sender who sent us the message?
2780 * @param buffer unaligned (!) buffer containing message
2781 * @param msize size of the message (including header)
2784 align_and_deliver (struct Neighbour *sender, const char *buffer, size_t msize)
2788 /* TODO: call to statistics? */
2789 memcpy (abuf, buffer, msize);
2790 deliver_message (sender, (const struct GNUNET_MessageHeader *) abuf, msize);
2795 * Deliver P2P messages to interested clients.
2797 * @param sender who sent us the message?
2798 * @param buffer buffer containing messages, can be modified
2799 * @param buffer_size size of the buffer (overall)
2800 * @param offset offset where messages in the buffer start
2803 deliver_messages (struct Neighbour *sender,
2804 const char *buffer, size_t buffer_size, size_t offset)
2806 struct GNUNET_MessageHeader *mhp;
2807 struct GNUNET_MessageHeader mh;
2811 while (offset + sizeof (struct GNUNET_MessageHeader) <= buffer_size)
2813 if (0 != offset % sizeof (uint16_t))
2815 /* outch, need to copy to access header */
2816 memcpy (&mh, &buffer[offset], sizeof (struct GNUNET_MessageHeader));
2821 /* can access header directly */
2822 mhp = (struct GNUNET_MessageHeader *) &buffer[offset];
2824 msize = ntohs (mhp->size);
2825 if (msize + offset > buffer_size)
2827 /* malformed message, header says it is larger than what
2828 would fit into the overall buffer */
2829 GNUNET_break_op (0);
2832 #if HAVE_UNALIGNED_64_ACCESS
2833 need_align = (0 != offset % 4) ? GNUNET_YES : GNUNET_NO;
2835 need_align = (0 != offset % 8) ? GNUNET_YES : GNUNET_NO;
2837 if (GNUNET_YES == need_align)
2838 align_and_deliver (sender, &buffer[offset], msize);
2840 deliver_message (sender,
2841 (const struct GNUNET_MessageHeader *)
2842 &buffer[offset], msize);
2849 * We received an encrypted message. Decrypt, validate and
2850 * pass on to the appropriate clients.
2853 handle_encrypted_message (struct Neighbour *n,
2854 const struct EncryptedMessage *m)
2856 size_t size = ntohs (m->header.size);
2858 struct EncryptedMessage *pt; /* plaintext */
2862 struct GNUNET_TIME_Absolute t;
2865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2866 "Core service receives `%s' request from `%4s'.\n",
2867 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
2873 &m->sequence_number,
2874 &buf[ENCRYPTED_HEADER_SIZE], size - ENCRYPTED_HEADER_SIZE))
2876 pt = (struct EncryptedMessage *) buf;
2879 GNUNET_CRYPTO_hash (&pt->sequence_number,
2880 size - ENCRYPTED_HEADER_SIZE, &ph);
2881 if (0 != memcmp (&ph, &m->plaintext_hash, sizeof (GNUNET_HashCode)))
2883 /* checksum failed */
2884 GNUNET_break_op (0);
2888 /* validate sequence number */
2889 snum = ntohl (pt->sequence_number);
2890 if (n->last_sequence_number_received == snum)
2892 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2893 "Received duplicate message, ignoring.\n");
2894 /* duplicate, ignore */
2897 if ((n->last_sequence_number_received > snum) &&
2898 (n->last_sequence_number_received - snum > 32))
2900 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2901 "Received ancient out of sequence message, ignoring.\n");
2902 /* ancient out of sequence, ignore */
2905 if (n->last_sequence_number_received > snum)
2907 unsigned int rotbit =
2908 1 << (n->last_sequence_number_received - snum - 1);
2909 if ((n->last_packets_bitmap & rotbit) != 0)
2911 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2912 "Received duplicate message, ignoring.\n");
2913 /* duplicate, ignore */
2916 n->last_packets_bitmap |= rotbit;
2918 if (n->last_sequence_number_received < snum)
2920 n->last_packets_bitmap <<= (snum - n->last_sequence_number_received);
2921 n->last_sequence_number_received = snum;
2924 /* check timestamp */
2925 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
2926 if (GNUNET_TIME_absolute_get_duration (t).value > MAX_MESSAGE_AGE.value)
2928 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2930 ("Message received far too old (%llu ms). Content ignored.\n"),
2931 GNUNET_TIME_absolute_get_duration (t).value);
2935 /* process decrypted message(s) */
2936 update_window (GNUNET_YES,
2937 &n->available_send_window,
2938 &n->last_asw_update,
2940 n->bpm_out_external_limit = ntohl (pt->inbound_bpm_limit);
2941 n->bpm_out = GNUNET_MAX (n->bpm_out_external_limit,
2942 n->bpm_out_internal_limit);
2943 n->last_activity = GNUNET_TIME_absolute_get ();
2944 off = sizeof (struct EncryptedMessage);
2945 deliver_messages (n, buf, size, off);
2950 * Function called by the transport for each received message.
2952 * @param cls closure
2953 * @param peer (claimed) identity of the other peer
2954 * @param message the message
2955 * @param latency estimated latency for communicating with the
2956 * given peer (round-trip)
2957 * @param distance in overlay hops, as given by transport plugin
2960 handle_transport_receive (void *cls,
2961 const struct GNUNET_PeerIdentity *peer,
2962 const struct GNUNET_MessageHeader *message,
2963 struct GNUNET_TIME_Relative latency,
2964 unsigned int distance)
2966 struct Neighbour *n;
2967 struct GNUNET_TIME_Absolute now;
2973 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2974 "Received message of type %u from `%4s', demultiplexing.\n",
2975 ntohs (message->type), GNUNET_i2s (peer));
2977 n = find_neighbour (peer);
2983 GNUNET_break (n->is_connected);
2984 n->last_latency = latency;
2985 n->last_distance = distance;
2986 up = (n->status == PEER_STATE_KEY_CONFIRMED);
2987 type = ntohs (message->type);
2988 size = ntohs (message->size);
2991 "Received message of type %u from `%4s'\n",
2997 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
2998 if (size != sizeof (struct SetKeyMessage))
3000 GNUNET_break_op (0);
3003 handle_set_key (n, (const struct SetKeyMessage *) message);
3005 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3006 if (size < sizeof (struct EncryptedMessage) +
3007 sizeof (struct GNUNET_MessageHeader))
3009 GNUNET_break_op (0);
3012 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3013 (n->status != PEER_STATE_KEY_CONFIRMED))
3015 GNUNET_break_op (0);
3018 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3020 case GNUNET_MESSAGE_TYPE_CORE_PING:
3021 if (size != sizeof (struct PingMessage))
3023 GNUNET_break_op (0);
3026 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3027 (n->status != PEER_STATE_KEY_CONFIRMED))
3030 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3031 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3032 "PING", GNUNET_i2s (&n->peer));
3034 GNUNET_free_non_null (n->pending_ping);
3035 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3036 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3039 handle_ping (n, (const struct PingMessage *) message);
3041 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3042 if (size != sizeof (struct PingMessage))
3044 GNUNET_break_op (0);
3047 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3048 (n->status != PEER_STATE_KEY_CONFIRMED) )
3051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3052 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3053 "PONG", GNUNET_i2s (&n->peer));
3055 GNUNET_free_non_null (n->pending_pong);
3056 n->pending_pong = GNUNET_malloc (sizeof (struct PingMessage));
3057 memcpy (n->pending_pong, message, sizeof (struct PingMessage));
3060 handle_pong (n, (const struct PingMessage *) message);
3063 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3064 _("Unsupported message of type %u received.\n"), type);
3067 if (n->status == PEER_STATE_KEY_CONFIRMED)
3069 now = GNUNET_TIME_absolute_get ();
3070 n->last_activity = now;
3072 n->time_established = now;
3078 * Function that recalculates the bandwidth quota for the
3079 * given neighbour and transmits it to the transport service.
3081 * @param cls neighbour for the quota update
3085 neighbour_quota_update (void *cls,
3086 const struct GNUNET_SCHEDULER_TaskContext *tc)
3088 struct Neighbour *n = cls;
3092 unsigned long long distributable;
3094 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
3095 /* calculate relative preference among all neighbours;
3096 divides by a bit more to avoid division by zero AND to
3097 account for possibility of new neighbours joining any time
3098 AND to convert to double... */
3099 pref_rel = n->current_preference / (1.0 + preference_sum);
3101 if (bandwidth_target_out > neighbour_count * MIN_BPM_PER_PEER)
3102 distributable = bandwidth_target_out - neighbour_count * MIN_BPM_PER_PEER;
3103 share = distributable * pref_rel;
3104 q_in = MIN_BPM_PER_PEER + (unsigned long long) share;
3105 /* check if we want to disconnect for good due to inactivity */
3106 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) &&
3107 (GNUNET_TIME_absolute_get_duration (n->time_established).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) )
3110 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3111 "Forcing disconnect of `%4s' due to inactivity (?).\n",
3112 GNUNET_i2s (&n->peer));
3114 q_in = 0; /* force disconnect */
3116 if ( (n->bpm_in + MIN_BPM_CHANGE < q_in) ||
3117 (n->bpm_in - MIN_BPM_CHANGE > q_in) )
3120 GNUNET_TRANSPORT_set_quota (transport,
3124 GNUNET_TIME_UNIT_FOREVER_REL,
3127 schedule_quota_update (n);
3132 * Function called by transport to notify us that
3133 * a peer connected to us (on the network level).
3135 * @param cls closure
3136 * @param peer the peer that connected
3137 * @param latency current latency of the connection
3138 * @param distance in overlay hops, as given by transport plugin
3141 handle_transport_notify_connect (void *cls,
3142 const struct GNUNET_PeerIdentity *peer,
3143 struct GNUNET_TIME_Relative latency,
3144 unsigned int distance)
3146 struct Neighbour *n;
3147 struct GNUNET_TIME_Absolute now;
3148 struct ConnectNotifyMessage cnm;
3150 n = find_neighbour (peer);
3153 if (n->is_connected)
3155 /* duplicate connect notification!? */
3162 n = create_neighbour (peer);
3164 now = GNUNET_TIME_absolute_get ();
3165 n->is_connected = GNUNET_YES;
3166 n->last_latency = latency;
3167 n->last_distance = distance;
3168 n->last_asw_update = now;
3169 n->last_arw_update = now;
3171 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3172 "Received connection from `%4s'.\n",
3173 GNUNET_i2s (&n->peer));
3175 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
3176 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_PRE_CONNECT);
3177 cnm.distance = htonl (n->last_distance);
3178 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
3180 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_PRE_CONNECT);
3186 * Function called by transport telling us that a peer
3189 * @param cls closure
3190 * @param peer the peer that disconnected
3193 handle_transport_notify_disconnect (void *cls,
3194 const struct GNUNET_PeerIdentity *peer)
3196 struct DisconnectNotifyMessage cnm;
3197 struct Neighbour *n;
3200 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3201 "Peer `%4s' disconnected from us.\n", GNUNET_i2s (peer));
3203 n = find_neighbour (peer);
3204 GNUNET_break (n->is_connected);
3205 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
3206 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
3208 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
3209 n->is_connected = GNUNET_NO;
3214 * Last task run during shutdown. Disconnects us from
3218 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3220 struct Neighbour *n;
3224 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3225 "Core service shutting down.\n");
3227 GNUNET_assert (transport != NULL);
3228 GNUNET_TRANSPORT_disconnect (transport);
3230 while (NULL != (n = neighbours))
3232 neighbours = n->next;
3233 GNUNET_assert (neighbour_count > 0);
3237 GNUNET_SERVER_notification_context_destroy (notifier);
3239 while (NULL != (c = clients))
3240 handle_client_disconnect (NULL, c->client_handle);
3241 if (my_private_key != NULL)
3242 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3247 * Initiate core service.
3249 * @param cls closure
3250 * @param s scheduler to use
3251 * @param serv the initialized server
3252 * @param c configuration to use
3256 struct GNUNET_SCHEDULER_Handle *s,
3257 struct GNUNET_SERVER_Handle *serv,
3258 const struct GNUNET_CONFIGURATION_Handle *c)
3261 unsigned long long qin;
3262 unsigned long long qout;
3263 unsigned long long tneigh;
3269 /* parse configuration */
3272 GNUNET_CONFIGURATION_get_value_number (c,
3275 &bandwidth_target_in)) ||
3277 GNUNET_CONFIGURATION_get_value_number (c,
3280 &bandwidth_target_out)) ||
3282 GNUNET_CONFIGURATION_get_value_filename (c,
3284 "HOSTKEY", &keyfile)))
3286 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3288 ("Core service is lacking key configuration settings. Exiting.\n"));
3289 GNUNET_SCHEDULER_shutdown (s);
3292 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3293 GNUNET_free (keyfile);
3294 if (my_private_key == NULL)
3296 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3297 _("Core service could not access hostkey. Exiting.\n"));
3298 GNUNET_SCHEDULER_shutdown (s);
3301 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3302 GNUNET_CRYPTO_hash (&my_public_key,
3303 sizeof (my_public_key), &my_identity.hashPubKey);
3304 /* setup notification */
3306 notifier = GNUNET_SERVER_notification_context_create (server,
3308 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
3309 /* setup transport connection */
3310 transport = GNUNET_TRANSPORT_connect (sched,
3313 &handle_transport_receive,
3314 &handle_transport_notify_connect,
3315 &handle_transport_notify_disconnect);
3316 GNUNET_assert (NULL != transport);
3317 GNUNET_SCHEDULER_add_delayed (sched,
3318 GNUNET_TIME_UNIT_FOREVER_REL,
3319 &cleaning_task, NULL);
3320 /* process client requests */
3321 GNUNET_SERVER_add_handlers (server, handlers);
3322 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3323 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
3329 * The main function for the transport service.
3331 * @param argc number of arguments from the command line
3332 * @param argv command line arguments
3333 * @return 0 ok, 1 on error
3336 main (int argc, char *const *argv)
3338 return (GNUNET_OK ==
3339 GNUNET_SERVICE_run (argc,
3342 GNUNET_SERVICE_OPTION_NONE,
3343 &run, NULL)) ? 0 : 1;
3346 /* end of gnunet-service-core.c */