5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2008 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; version 2 of the License.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
20 * Created: Fri Jul 25 18:52:14 1997
26 /************************** Types and definitions ***************************/
28 /* Per scheduler (which usually means per thread) data. We put per scheduler
29 data here for accessing without locking. SILC Schedule dictates that
30 tasks are dispatched in one thread, hence the per scheduler context. */
32 SilcSchedule schedule; /* The scheduler */
33 SilcPacketEngine engine; /* Packet engine */
34 SilcDList inbufs; /* Data inbut buffer list */
35 SilcUInt32 stream_count; /* Number of streams using this */
36 } *SilcPacketEngineContext;
39 struct SilcPacketEngineStruct {
40 SilcMutex lock; /* Engine lock */
41 SilcRng rng; /* RNG for engine */
42 SilcHashTable contexts; /* Per scheduler contexts */
43 SilcPacketCallbacks *callbacks; /* Packet callbacks */
44 void *callback_context; /* Context for callbacks */
45 SilcList streams; /* All streams in engine */
46 SilcList packet_pool; /* Free list for received packets */
47 SilcHashTable udp_remote; /* UDP remote streams, or NULL */
48 unsigned int local_is_router : 1;
51 /* Packet processor context */
52 typedef struct SilcPacketProcessStruct {
53 SilcPacketType *types; /* Packets to process */
54 SilcPacketCallbacks *callbacks; /* Callbacks or NULL */
55 void *callback_context;
56 SilcInt32 priority; /* Priority */
59 /* UDP remote stream tuple */
61 char *remote_ip; /* Remote IP address */
62 SilcUInt16 remote_port; /* Remote port */
63 } *SilcPacketRemoteUDP;
66 struct SilcPacketStreamStruct {
67 struct SilcPacketStreamStruct *next;
68 SilcPacketEngineContext sc; /* Per scheduler context */
69 SilcStream stream; /* Underlaying stream */
70 SilcMutex lock; /* Packet stream lock */
71 SilcDList process; /* Packet processors, or NULL */
72 SilcPacketRemoteUDP remote_udp; /* UDP remote stream tuple, or NULL */
73 void *stream_context; /* Stream context */
74 SilcBufferStruct outbuf; /* Out buffer */
75 SilcBuffer inbuf; /* Inbuf from inbuf list or NULL */
76 SilcCipher send_key[2]; /* Sending key */
77 SilcHmac send_hmac[2]; /* Sending HMAC */
78 SilcCipher receive_key[2]; /* Receiving key */
79 SilcHmac receive_hmac[2]; /* Receiving HMAC */
80 unsigned char *src_id; /* Source ID */
81 unsigned char *dst_id; /* Destination ID */
82 SilcUInt32 send_psn; /* Sending sequence */
83 SilcUInt32 receive_psn; /* Receiving sequence */
84 SilcAtomic8 refcnt; /* Reference counter */
85 SilcUInt8 sid; /* Security ID, set if IV included */
86 unsigned int src_id_len : 6;
87 unsigned int src_id_type : 2;
88 unsigned int dst_id_len : 6;
89 unsigned int dst_id_type : 2;
90 unsigned int is_router : 1; /* Set if router stream */
91 unsigned int destroyed : 1; /* Set if destroyed */
92 unsigned int iv_included : 1; /* Set if IV included */
93 unsigned int udp : 1; /* UDP remote stream */
96 /* Initial size of stream buffers */
97 #define SILC_PACKET_DEFAULT_SIZE 1024
99 /* Header length without source and destination ID's. */
100 #define SILC_PACKET_HEADER_LEN 10
102 /* Minimum length of SILC Packet Header. */
103 #define SILC_PACKET_MIN_HEADER_LEN 16
104 #define SILC_PACKET_MIN_HEADER_LEN_IV 32 + 1
106 /* Maximum padding length */
107 #define SILC_PACKET_MAX_PADLEN 128
109 /* Default padding length */
110 #define SILC_PACKET_DEFAULT_PADLEN 16
112 /* Minimum packet length */
113 #define SILC_PACKET_MIN_LEN (SILC_PACKET_HEADER_LEN + 1)
115 /* Returns true length of the packet. */
116 #define SILC_PACKET_LENGTH(__packetdata, __ret_truelen, __ret_paddedlen) \
118 SILC_GET16_MSB((__ret_truelen), (__packetdata)); \
119 (__ret_paddedlen) = (__ret_truelen) + (SilcUInt8)(__packetdata)[4]; \
122 /* Calculates the data length with given header length. This macro
123 can be used to check whether the data_len with header_len exceeds
124 SILC_PACKET_MAX_LEN. If it does, this returns the new data_len
125 so that the SILC_PACKET_MAX_LEN is not exceeded. If the data_len
126 plus header_len fits SILC_PACKET_MAX_LEN the returned data length
127 is the data_len given as argument. */
128 #define SILC_PACKET_DATALEN(data_len, header_len) \
129 ((data_len + header_len) > SILC_PACKET_MAX_LEN ? \
130 data_len - ((data_len + header_len) - SILC_PACKET_MAX_LEN) : data_len)
132 /* Calculates the length of the padding in the packet. */
133 #define SILC_PACKET_PADLEN(__packetlen, __blocklen, __padlen) \
135 __padlen = (SILC_PACKET_DEFAULT_PADLEN - (__packetlen) % \
136 ((__blocklen) ? (__blocklen) : SILC_PACKET_DEFAULT_PADLEN)); \
138 __padlen += ((__blocklen) ? (__blocklen) : SILC_PACKET_DEFAULT_PADLEN); \
141 /* Returns the length of the padding up to the maximum length, which
143 #define SILC_PACKET_PADLEN_MAX(__packetlen, __blocklen, __padlen) \
145 __padlen = (SILC_PACKET_MAX_PADLEN - (__packetlen) % \
146 ((__blocklen) ? (__blocklen) : SILC_PACKET_DEFAULT_PADLEN)); \
150 #define SILC_PACKET_CALLBACK_EOS(s) \
152 (s)->sc->engine->callbacks->eos((s)->sc->engine, s, \
153 (s)->sc->engine->callback_context, \
154 (s)->stream_context); \
158 #define SILC_PACKET_CALLBACK_ERROR(s, err) \
160 (s)->sc->engine->callbacks->error((s)->sc->engine, s, err, \
161 (s)->sc->engine->callback_context, \
162 (s)->stream_context); \
165 static SilcBool silc_packet_dispatch(SilcPacket packet);
166 static void silc_packet_read_process(SilcPacketStream stream);
167 static inline SilcBool silc_packet_send_raw(SilcPacketStream stream,
169 SilcPacketFlags flags,
170 SilcIdType src_id_type,
171 unsigned char *src_id,
172 SilcUInt32 src_id_len,
173 SilcIdType dst_id_type,
174 unsigned char *dst_id,
175 SilcUInt32 dst_id_len,
176 const unsigned char *data,
181 /************************ Static utility functions **************************/
183 /* Injects packet to new stream created with silc_packet_stream_add_remote. */
185 SILC_TASK_CALLBACK(silc_packet_stream_inject_packet)
187 SilcPacket packet = context;
188 SilcPacketStream stream = packet->stream;
190 SILC_LOG_DEBUG(("Injecting packet %p to stream %p", packet, packet->stream));
192 silc_mutex_lock(stream->lock);
193 if (!stream->destroyed)
194 silc_packet_dispatch(packet);
195 silc_mutex_unlock(stream->lock);
196 silc_packet_stream_unref(stream);
199 /* Write data to the stream. Must be called with ps->lock locked. Unlocks
200 the lock inside this function, unless no_unlock is TRUE. Unlocks always
201 in case it returns FALSE. */
203 static inline SilcBool silc_packet_stream_write(SilcPacketStream ps,
211 stream = ((SilcPacketStream)ps->stream)->stream;
215 if (ps->udp && silc_socket_stream_is_udp(stream, &connected)) {
217 /* Connectionless UDP stream */
218 while (silc_buffer_len(&ps->outbuf) > 0) {
219 i = silc_net_udp_send(stream, ps->remote_udp->remote_ip,
220 ps->remote_udp->remote_port,
221 ps->outbuf.data, silc_buffer_len(&ps->outbuf));
222 if (silc_unlikely(i == -2)) {
224 silc_buffer_reset(&ps->outbuf);
225 SILC_PACKET_CALLBACK_ERROR(ps, SILC_PACKET_ERR_WRITE);
229 if (silc_unlikely(i == -1)) {
230 /* Cannot write now, write later. */
232 silc_mutex_unlock(ps->lock);
237 silc_buffer_pull(&ps->outbuf, i);
240 silc_buffer_reset(&ps->outbuf);
242 silc_mutex_unlock(ps->lock);
248 /* Write the data to the stream */
249 while (silc_buffer_len(&ps->outbuf) > 0) {
250 i = silc_stream_write(stream, ps->outbuf.data,
251 silc_buffer_len(&ps->outbuf));
252 if (silc_unlikely(i == 0)) {
254 silc_buffer_reset(&ps->outbuf);
255 silc_mutex_unlock(ps->lock);
256 SILC_PACKET_CALLBACK_EOS(ps);
260 if (silc_unlikely(i == -2)) {
262 silc_buffer_reset(&ps->outbuf);
263 silc_mutex_unlock(ps->lock);
264 SILC_PACKET_CALLBACK_ERROR(ps, SILC_PACKET_ERR_WRITE);
268 if (silc_unlikely(i == -1)) {
269 /* Cannot write now, write later. */
271 silc_mutex_unlock(ps->lock);
276 silc_buffer_pull(&ps->outbuf, i);
279 silc_buffer_reset(&ps->outbuf);
281 silc_mutex_unlock(ps->lock);
286 /* Reads data from stream. Must be called with ps->lock locked. If this
287 returns FALSE the lock has been unlocked. If this returns packet stream
288 to `ret_ps' its lock has been acquired and `ps' lock has been unlocked.
289 It is returned if the stream is UDP and remote UDP stream exists for
290 the sender of the packet. */
292 static inline SilcBool silc_packet_stream_read(SilcPacketStream ps,
293 SilcPacketStream *ret_ps)
295 SilcStream stream = ps->stream;
300 /* Get inbuf. If there is already some data for this stream in the buffer
301 we already have it. Otherwise get the current one from list, it will
305 silc_dlist_start(ps->sc->inbufs);
306 inbuf = silc_dlist_get(ps->sc->inbufs);
308 /* Allocate new data input buffer */
309 inbuf = silc_buffer_alloc(SILC_PACKET_DEFAULT_SIZE * 65);
311 silc_mutex_unlock(ps->lock);
314 silc_buffer_reset(inbuf);
315 silc_dlist_add(ps->sc->inbufs, inbuf);
319 /* Make sure there is enough room to read */
320 if (SILC_PACKET_DEFAULT_SIZE * 2 > silc_buffer_taillen(inbuf))
321 silc_buffer_realloc(inbuf, silc_buffer_truelen(inbuf) +
322 (SILC_PACKET_DEFAULT_SIZE * 2));
324 if (silc_socket_stream_is_udp(stream, &connected)) {
326 /* Connectionless UDP stream, read one UDP packet */
327 char remote_ip[64], tuple[64];
329 SilcPacketStream remote;
331 ret = silc_net_udp_receive(stream, remote_ip, sizeof(remote_ip),
332 &remote_port, inbuf->tail,
333 silc_buffer_taillen(inbuf));
335 if (silc_unlikely(ret < 0)) {
336 silc_mutex_unlock(ps->lock);
338 /* Cannot read now, do it later. */
343 silc_buffer_reset(inbuf);
344 SILC_PACKET_CALLBACK_ERROR(ps, SILC_PACKET_ERR_READ);
348 /* See if remote packet stream exist for this sender */
349 silc_snprintf(tuple, sizeof(tuple), "%d%s", remote_port, remote_ip);
350 silc_mutex_lock(ps->sc->engine->lock);
351 if (silc_hash_table_find(ps->sc->engine->udp_remote, tuple, NULL,
353 silc_mutex_unlock(ps->sc->engine->lock);
354 SILC_LOG_DEBUG(("UDP packet from %s:%d for stream %p", remote_ip,
355 remote_port, remote));
356 silc_mutex_unlock(ps->lock);
357 silc_mutex_lock(remote->lock);
361 silc_mutex_unlock(ps->sc->engine->lock);
364 if (!ps->remote_udp) {
365 ps->remote_udp = silc_calloc(1, sizeof(*ps->remote_udp));
366 if (silc_unlikely(!ps->remote_udp)) {
367 silc_mutex_unlock(ps->lock);
368 SILC_PACKET_CALLBACK_ERROR(ps, SILC_PACKET_ERR_NO_MEMORY);
373 /* Save sender IP and port */
374 silc_free(ps->remote_udp->remote_ip);
375 ps->remote_udp->remote_ip = strdup(remote_ip);
376 ps->remote_udp->remote_port = remote_port;
378 silc_buffer_pull_tail(inbuf, ret);
383 /* Read data from the stream */
384 ret = silc_stream_read(stream, inbuf->tail, silc_buffer_taillen(inbuf));
385 if (silc_unlikely(ret <= 0)) {
386 silc_mutex_unlock(ps->lock);
389 silc_buffer_reset(inbuf);
390 SILC_PACKET_CALLBACK_EOS(ps);
395 /* Cannot read now, do it later. */
400 silc_buffer_reset(inbuf);
401 SILC_PACKET_CALLBACK_ERROR(ps, SILC_PACKET_ERR_READ);
405 silc_buffer_pull_tail(inbuf, ret);
409 /* Our stream IO notifier callback. */
411 static void silc_packet_stream_io(SilcStream stream, SilcStreamStatus status,
414 SilcPacketStream remote = NULL, ps = context;
416 silc_mutex_lock(ps->lock);
418 if (silc_unlikely(ps->destroyed)) {
419 silc_mutex_unlock(ps->lock);
424 case SILC_STREAM_CAN_READ:
425 /* Reading is locked also with stream->lock because we may be reading
426 at the same time other thread is writing to same underlaying stream. */
427 SILC_LOG_DEBUG(("Reading data from stream %p, ps %p", ps->stream, ps));
429 /* Read data from stream */
430 if (!silc_packet_stream_read(ps, &remote))
433 /* Now process the data */
434 silc_packet_stream_ref(ps);
436 silc_packet_read_process(ps);
437 silc_mutex_unlock(ps->lock);
439 silc_packet_read_process(remote);
440 silc_mutex_unlock(remote->lock);
442 silc_packet_stream_unref(ps);
445 case SILC_STREAM_CAN_WRITE:
446 SILC_LOG_DEBUG(("Writing pending data to stream %p, ps %p",
449 if (silc_unlikely(!silc_buffer_headlen(&ps->outbuf))) {
450 silc_mutex_unlock(ps->lock);
454 /* Write pending data to stream */
455 silc_packet_stream_write(ps, FALSE);
459 silc_mutex_unlock(ps->lock);
464 /* Allocate packet */
466 static SilcPacket silc_packet_alloc(SilcPacketEngine engine)
470 SILC_LOG_DEBUG(("Packet pool count %d",
471 silc_list_count(engine->packet_pool)));
473 silc_mutex_lock(engine->lock);
475 /* Get packet from freelist or allocate new one. */
476 packet = silc_list_get(engine->packet_pool);
480 silc_mutex_unlock(engine->lock);
482 packet = silc_calloc(1, sizeof(*packet));
483 if (silc_unlikely(!packet))
486 SILC_LOG_DEBUG(("Allocating new packet %p", packet));
488 tmp = silc_malloc(SILC_PACKET_DEFAULT_SIZE);
489 if (silc_unlikely(!tmp)) {
493 silc_buffer_set(&packet->buffer, tmp, SILC_PACKET_DEFAULT_SIZE);
494 silc_buffer_reset(&packet->buffer);
499 SILC_LOG_DEBUG(("Get packet %p", packet));
501 /* Delete from freelist */
502 silc_list_del(engine->packet_pool, packet);
504 silc_mutex_unlock(engine->lock);
509 /* UDP remote stream hash table destructor */
511 static void silc_packet_engine_hash_destr(void *key, void *context,
517 /* Per scheduler context hash table destructor */
519 static void silc_packet_engine_context_destr(void *key, void *context,
522 SilcPacketEngineContext sc = context;
525 silc_dlist_start(sc->inbufs);
526 while ((buffer = silc_dlist_get(sc->inbufs))) {
527 silc_buffer_clear(buffer);
528 silc_buffer_free(buffer);
529 silc_dlist_del(sc->inbufs, buffer);
532 silc_dlist_uninit(sc->inbufs);
537 /******************************** Packet API ********************************/
539 /* Allocate new packet engine */
542 silc_packet_engine_start(SilcRng rng, SilcBool router,
543 SilcPacketCallbacks *callbacks,
544 void *callback_context)
546 SilcPacketEngine engine;
551 SILC_LOG_DEBUG(("Starting new packet engine"));
555 if (!callbacks->packet_receive || !callbacks->eos || !callbacks->error)
558 engine = silc_calloc(1, sizeof(*engine));
562 engine->contexts = silc_hash_table_alloc(0, silc_hash_ptr, NULL, NULL, NULL,
563 silc_packet_engine_context_destr,
565 if (!engine->contexts) {
571 engine->local_is_router = router;
572 engine->callbacks = callbacks;
573 engine->callback_context = callback_context;
574 silc_list_init(engine->streams, struct SilcPacketStreamStruct, next);
575 silc_mutex_alloc(&engine->lock);
577 /* Allocate packet free list */
578 silc_list_init(engine->packet_pool, struct SilcPacketStruct, next);
579 for (i = 0; i < 5; i++) {
580 packet = silc_calloc(1, sizeof(*packet));
582 silc_packet_engine_stop(engine);
586 tmp = silc_malloc(SILC_PACKET_DEFAULT_SIZE);
588 silc_packet_engine_stop(engine);
591 silc_buffer_set(&packet->buffer, tmp, SILC_PACKET_DEFAULT_SIZE);
592 silc_buffer_reset(&packet->buffer);
594 silc_list_add(engine->packet_pool, packet);
596 silc_list_start(engine->packet_pool);
601 /* Stop packet engine */
603 void silc_packet_engine_stop(SilcPacketEngine engine)
607 SILC_LOG_DEBUG(("Stopping packet engine"));
612 /* Free packet free list */
613 silc_list_start(engine->packet_pool);
614 while ((packet = silc_list_get(engine->packet_pool))) {
615 silc_buffer_purge(&packet->buffer);
619 silc_hash_table_free(engine->contexts);
620 silc_mutex_free(engine->lock);
624 static const char * const packet_error[] = {
625 "Cannot read from stream",
626 "Cannot write to stream",
628 "Packet decryption failed",
630 "Packet is malformed",
631 "System out of memory",
634 /* Return packet error string */
636 const char *silc_packet_error_string(SilcPacketError error)
638 if (error < SILC_PACKET_ERR_READ || error > SILC_PACKET_ERR_NO_MEMORY)
639 return "<invalid error code>";
640 return packet_error[error];
643 /* Return list of packet streams in the engine */
645 SilcDList silc_packet_engine_get_streams(SilcPacketEngine engine)
650 list = silc_dlist_init();
654 silc_mutex_lock(engine->lock);
655 silc_list_start(engine->streams);
656 while ((ps = silc_list_get(engine->streams))) {
657 silc_packet_stream_ref(ps);
658 silc_dlist_add(list, ps);
660 silc_mutex_unlock(engine->lock);
665 /* Free list returned by silc_packet_engine_get_streams */
667 void silc_packet_engine_free_streams_list(SilcDList streams)
671 silc_dlist_start(streams);
672 while ((ps = silc_dlist_get(streams)))
673 silc_packet_stream_unref(ps);
675 silc_dlist_uninit(streams);
678 /* Create new packet stream */
680 SilcPacketStream silc_packet_stream_create(SilcPacketEngine engine,
681 SilcSchedule schedule,
688 SILC_LOG_DEBUG(("Creating new packet stream"));
690 if (!engine || !stream)
693 ps = silc_calloc(1, sizeof(*ps));
698 silc_atomic_init8(&ps->refcnt, 1);
699 silc_mutex_alloc(&ps->lock);
701 /* Allocate out buffer */
702 tmp = silc_malloc(SILC_PACKET_DEFAULT_SIZE);
704 silc_packet_stream_destroy(ps);
707 silc_buffer_set(&ps->outbuf, tmp, SILC_PACKET_DEFAULT_SIZE);
708 silc_buffer_reset(&ps->outbuf);
710 /* Initialize packet procesors list */
711 ps->process = silc_dlist_init();
713 silc_packet_stream_destroy(ps);
717 silc_mutex_lock(engine->lock);
719 /* Add per scheduler context */
720 if (!silc_hash_table_find(engine->contexts, schedule, NULL,
722 ps->sc = silc_calloc(1, sizeof(*ps->sc));
724 silc_mutex_unlock(engine->lock);
725 silc_packet_stream_destroy(ps);
728 ps->sc->engine = engine;
729 ps->sc->schedule = schedule;
731 /* Allocate data input buffer */
732 inbuf = silc_buffer_alloc(SILC_PACKET_DEFAULT_SIZE * 65);
736 silc_mutex_unlock(engine->lock);
737 silc_packet_stream_destroy(ps);
740 silc_buffer_reset(inbuf);
742 ps->sc->inbufs = silc_dlist_init();
743 if (!ps->sc->inbufs) {
744 silc_buffer_free(inbuf);
747 silc_mutex_unlock(engine->lock);
748 silc_packet_stream_destroy(ps);
751 silc_dlist_add(ps->sc->inbufs, inbuf);
753 /* Add to per scheduler context hash table */
754 if (!silc_hash_table_add(engine->contexts, schedule, ps->sc)) {
755 silc_buffer_free(inbuf);
756 silc_dlist_del(ps->sc->inbufs, inbuf);
759 silc_mutex_unlock(engine->lock);
760 silc_packet_stream_destroy(ps);
764 ps->sc->stream_count++;
766 /* Add the packet stream to engine */
767 silc_list_add(engine->streams, ps);
769 /* If this is UDP stream, allocate UDP remote stream hash table */
770 if (!engine->udp_remote && silc_socket_stream_is_udp(stream, NULL))
771 engine->udp_remote = silc_hash_table_alloc(0, silc_hash_string, NULL,
772 silc_hash_string_compare, NULL,
773 silc_packet_engine_hash_destr,
776 silc_mutex_unlock(engine->lock);
778 /* Set IO notifier callback. This schedules this stream for I/O. */
779 if (!silc_stream_set_notifier(ps->stream, schedule,
780 silc_packet_stream_io, ps)) {
781 SILC_LOG_DEBUG(("Cannot set stream notifier for packet stream"));
782 silc_packet_stream_destroy(ps);
786 SILC_LOG_DEBUG(("Created packet stream %p", ps));
791 /* Add new remote packet stream for UDP packet streams */
793 SilcPacketStream silc_packet_stream_add_remote(SilcPacketStream stream,
794 const char *remote_ip,
795 SilcUInt16 remote_port,
798 SilcPacketEngine engine = stream->sc->engine;
803 SILC_LOG_DEBUG(("Adding UDP remote %s:%d to packet stream %p",
804 remote_ip, remote_port, stream));
806 if (!stream || !remote_ip || !remote_port)
809 if (!silc_socket_stream_is_udp(stream->stream, NULL)) {
810 SILC_LOG_ERROR(("Stream is not UDP stream, cannot add remote IP"));
814 ps = silc_calloc(1, sizeof(*ps));
819 silc_atomic_init8(&ps->refcnt, 1);
820 silc_mutex_alloc(&ps->lock);
822 /* Set the UDP packet stream as underlaying stream */
823 silc_packet_stream_ref(stream);
824 ps->stream = (SilcStream)stream;
827 /* Allocate out buffer */
828 tmp = silc_malloc(SILC_PACKET_DEFAULT_SIZE);
830 silc_packet_stream_destroy(ps);
833 silc_buffer_set(&ps->outbuf, tmp, SILC_PACKET_DEFAULT_SIZE);
834 silc_buffer_reset(&ps->outbuf);
836 /* Initialize packet procesors list */
837 ps->process = silc_dlist_init();
839 silc_packet_stream_destroy(ps);
843 /* Add to engine with this IP and port pair */
844 tuple = silc_format("%d%s", remote_port, remote_ip);
845 silc_mutex_lock(engine->lock);
846 if (!tuple || !silc_hash_table_add(engine->udp_remote, tuple, ps)) {
847 silc_mutex_unlock(engine->lock);
848 silc_packet_stream_destroy(ps);
851 silc_mutex_unlock(engine->lock);
853 /* Save remote IP and port pair */
854 ps->remote_udp = silc_calloc(1, sizeof(*ps->remote_udp));
855 if (!ps->remote_udp) {
856 silc_packet_stream_destroy(ps);
859 ps->remote_udp->remote_port = remote_port;
860 ps->remote_udp->remote_ip = strdup(remote_ip);
861 if (!ps->remote_udp->remote_ip) {
862 silc_packet_stream_destroy(ps);
867 /* Inject packet to the new stream */
869 silc_packet_stream_ref(ps);
870 silc_schedule_task_add_timeout(silc_stream_get_schedule(stream->stream),
871 silc_packet_stream_inject_packet, packet,
878 /* Destroy packet stream */
880 void silc_packet_stream_destroy(SilcPacketStream stream)
882 SilcPacketEngine engine;
887 if (silc_atomic_sub_int8(&stream->refcnt, 1) > 0) {
888 if (stream->destroyed)
890 stream->destroyed = TRUE;
892 SILC_LOG_DEBUG(("Marking packet stream %p destroyed", stream));
894 /* Close the underlaying stream */
895 if (!stream->udp && stream->stream)
896 silc_stream_close(stream->stream);
900 SILC_LOG_DEBUG(("Destroying packet stream %p", stream));
903 /* Delete from engine */
905 engine = stream->sc->engine;
906 silc_mutex_lock(engine->lock);
907 silc_list_del(engine->streams, stream);
909 /* Remove per scheduler context, if it is not used anymore */
910 stream->sc->stream_count--;
911 if (!stream->sc->stream_count)
912 silc_hash_table_del(engine->contexts, stream->sc->schedule);
914 silc_mutex_unlock(engine->lock);
917 /* Destroy the underlaying stream */
919 silc_stream_destroy(stream->stream);
921 /* Delete from UDP remote hash table */
923 engine = stream->sc->engine;
924 silc_snprintf(tuple, sizeof(tuple), "%d%s",
925 stream->remote_udp->remote_port,
926 stream->remote_udp->remote_ip);
927 silc_mutex_lock(engine->lock);
928 silc_hash_table_del(engine->udp_remote, tuple);
929 silc_mutex_unlock(engine->lock);
931 silc_free(stream->remote_udp->remote_ip);
932 silc_free(stream->remote_udp);
934 /* Unreference the underlaying packet stream */
935 silc_packet_stream_unref((SilcPacketStream)stream->stream);
938 /* Clear and free buffers */
939 silc_buffer_clear(&stream->outbuf);
940 silc_buffer_purge(&stream->outbuf);
942 if (stream->process) {
944 silc_dlist_start(stream->process);
945 while ((p = silc_dlist_get(stream->process))) {
948 silc_dlist_del(stream->process, p);
950 silc_dlist_uninit(stream->process);
953 /* Destroy ciphers and HMACs */
954 if (stream->send_key[0])
955 silc_cipher_free(stream->send_key[0]);
956 if (stream->receive_key[0])
957 silc_cipher_free(stream->receive_key[0]);
958 if (stream->send_hmac[0])
959 silc_hmac_free(stream->send_hmac[0]);
960 if (stream->receive_hmac[0])
961 silc_hmac_free(stream->receive_hmac[0]);
962 if (stream->send_key[1])
963 silc_cipher_free(stream->send_key[1]);
964 if (stream->receive_key[1])
965 silc_cipher_free(stream->receive_key[1]);
966 if (stream->send_hmac[1])
967 silc_hmac_free(stream->send_hmac[1]);
968 if (stream->receive_hmac[1])
969 silc_hmac_free(stream->receive_hmac[1]);
972 silc_free(stream->src_id);
973 silc_free(stream->dst_id);
975 silc_atomic_uninit8(&stream->refcnt);
976 silc_mutex_free(stream->lock);
980 /* Return TRUE if the stream is valid */
982 SilcBool silc_packet_stream_is_valid(SilcPacketStream stream)
984 return stream->destroyed == FALSE;
987 /* Marks as router stream */
989 void silc_packet_stream_set_router(SilcPacketStream stream)
991 stream->is_router = TRUE;
994 /* Mark to include IV in ciphertext */
996 void silc_packet_stream_set_iv_included(SilcPacketStream stream)
998 stream->iv_included = TRUE;
1001 /* Links `callbacks' to `stream' for specified packet types */
1003 static SilcBool silc_packet_stream_link_va(SilcPacketStream stream,
1004 SilcPacketCallbacks *callbacks,
1005 void *callback_context,
1006 int priority, va_list ap)
1008 SilcPacketProcess p, e;
1009 SilcInt32 packet_type;
1012 SILC_LOG_DEBUG(("Linking callbacks %p to stream %p", callbacks, stream));
1016 if (!callbacks->packet_receive)
1019 p = silc_calloc(1, sizeof(*p));
1023 p->priority = priority;
1024 p->callbacks = callbacks;
1025 p->callback_context = callback_context;
1027 silc_mutex_lock(stream->lock);
1029 if (!stream->process) {
1030 stream->process = silc_dlist_init();
1031 if (!stream->process) {
1032 silc_mutex_unlock(stream->lock);
1038 /* According to priority set the procesor to correct position. First
1039 entry has the highest priority */
1040 silc_dlist_start(stream->process);
1041 while ((e = silc_dlist_get(stream->process)) != SILC_LIST_END) {
1042 if (p->priority > e->priority) {
1043 silc_dlist_insert(stream->process, p);
1048 silc_dlist_add(stream->process, p);
1050 /* Get packet types to process */
1053 packet_type = va_arg(ap, SilcInt32);
1055 if (packet_type == SILC_PACKET_ANY)
1058 if (packet_type == -1)
1061 p->types = silc_realloc(p->types, sizeof(*p->types) * (i + 1));
1063 silc_mutex_unlock(stream->lock);
1067 p->types[i - 1] = (SilcPacketType)packet_type;
1071 p->types[i - 1] = 0;
1073 silc_mutex_unlock(stream->lock);
1075 silc_packet_stream_ref(stream);
1080 /* Links `callbacks' to `stream' for specified packet types */
1082 SilcBool silc_packet_stream_link(SilcPacketStream stream,
1083 SilcPacketCallbacks *callbacks,
1084 void *callback_context,
1090 va_start(ap, priority);
1091 ret = silc_packet_stream_link_va(stream, callbacks, callback_context,
1098 /* Unlinks `callbacks' from `stream'. */
1100 void silc_packet_stream_unlink(SilcPacketStream stream,
1101 SilcPacketCallbacks *callbacks,
1102 void *callback_context)
1104 SilcPacketProcess p;
1106 SILC_LOG_DEBUG(("Unlinking callbacks %p from stream %p",
1107 callbacks, stream));
1109 silc_mutex_lock(stream->lock);
1111 silc_dlist_start(stream->process);
1112 while ((p = silc_dlist_get(stream->process)) != SILC_LIST_END)
1113 if (p->callbacks == callbacks &&
1114 p->callback_context == callback_context) {
1115 silc_dlist_del(stream->process, p);
1116 silc_free(p->types);
1121 if (!silc_dlist_count(stream->process)) {
1122 silc_dlist_uninit(stream->process);
1123 stream->process = NULL;
1126 silc_mutex_unlock(stream->lock);
1128 silc_packet_stream_unref(stream);
1131 /* Returns TRUE if stream is UDP stream */
1133 SilcBool silc_packet_stream_is_udp(SilcPacketStream stream)
1135 return stream->udp || silc_socket_stream_is_udp(stream->stream, NULL);
1138 /* Return packet sender IP and port for UDP packet stream */
1140 SilcBool silc_packet_get_sender(SilcPacket packet,
1141 const char **sender_ip,
1142 SilcUInt16 *sender_port)
1144 if (!packet->stream->remote_udp)
1147 *sender_ip = packet->stream->remote_udp->remote_ip;
1148 *sender_port = packet->stream->remote_udp->remote_port;
1153 /* Reference packet stream */
1155 void silc_packet_stream_ref(SilcPacketStream stream)
1157 silc_atomic_add_int8(&stream->refcnt, 1);
1158 SILC_LOG_DEBUG(("Stream %p, refcnt %d->%d", stream,
1159 silc_atomic_get_int8(&stream->refcnt) - 1,
1160 silc_atomic_get_int8(&stream->refcnt)));
1163 /* Unreference packet stream */
1165 void silc_packet_stream_unref(SilcPacketStream stream)
1167 SILC_LOG_DEBUG(("Stream %p, refcnt %d->%d", stream,
1168 silc_atomic_get_int8(&stream->refcnt),
1169 silc_atomic_get_int8(&stream->refcnt) - 1));
1170 if (silc_atomic_sub_int8(&stream->refcnt, 1) > 0)
1172 silc_atomic_add_int8(&stream->refcnt, 1);
1173 silc_packet_stream_destroy(stream);
1178 SilcPacketEngine silc_packet_get_engine(SilcPacketStream stream)
1180 return stream->sc->engine;
1183 /* Set application context for packet stream */
1185 void silc_packet_set_context(SilcPacketStream stream, void *stream_context)
1187 silc_mutex_lock(stream->lock);
1188 stream->stream_context = stream_context;
1189 silc_mutex_unlock(stream->lock);
1192 /* Return application context from packet stream */
1194 void *silc_packet_get_context(SilcPacketStream stream)
1197 silc_mutex_lock(stream->lock);
1198 context = stream->stream_context;
1199 silc_mutex_unlock(stream->lock);
1203 /* Change underlaying stream */
1205 void silc_packet_stream_set_stream(SilcPacketStream ps,
1209 silc_stream_set_notifier(ps->stream, ps->sc->schedule, NULL, NULL);
1210 ps->stream = stream;
1211 silc_stream_set_notifier(ps->stream, ps->sc->schedule, silc_packet_stream_io,
1215 /* Return underlaying stream */
1217 SilcStream silc_packet_stream_get_stream(SilcPacketStream stream)
1219 return stream->stream;
1224 SilcBool silc_packet_set_keys(SilcPacketStream stream, SilcCipher send_key,
1225 SilcCipher receive_key, SilcHmac send_hmac,
1226 SilcHmac receive_hmac, SilcBool rekey)
1228 SILC_LOG_DEBUG(("Setting new keys to packet stream %p", stream));
1230 /* If doing rekey, send REKEY_DONE packet */
1232 /* This will take stream lock. */
1233 if (!silc_packet_send_raw(stream, SILC_PACKET_REKEY_DONE, 0,
1234 stream->src_id_type, stream->src_id,
1235 stream->src_id_len, stream->dst_id_type,
1236 stream->dst_id, stream->dst_id_len,
1237 NULL, 0, stream->send_key[0],
1238 stream->send_hmac[0]))
1241 /* Write the packet to the stream */
1242 if (!silc_packet_stream_write(stream, TRUE))
1245 silc_mutex_lock(stream->lock);
1248 /* In case IV Included is set, save the old keys */
1249 if (stream->iv_included) {
1250 if (stream->send_key[1] && send_key) {
1251 silc_cipher_free(stream->send_key[1]);
1252 stream->send_key[1] = stream->send_key[0];
1254 if (stream->receive_key[1] && receive_key) {
1255 silc_cipher_free(stream->receive_key[1]);
1256 stream->receive_key[1] = stream->receive_key[0];
1258 if (stream->send_hmac[1] && send_hmac) {
1259 silc_hmac_free(stream->send_hmac[1]);
1260 stream->send_hmac[1] = stream->send_hmac[0];
1262 if (stream->receive_hmac[1] && receive_hmac) {
1263 silc_hmac_free(stream->receive_hmac[1]);
1264 stream->receive_hmac[1] = stream->receive_hmac[0];
1267 if (stream->send_key[0] && send_key)
1268 silc_cipher_free(stream->send_key[0]);
1269 if (stream->receive_key[0] && receive_key)
1270 silc_cipher_free(stream->receive_key[0]);
1271 if (stream->send_hmac[0] && send_hmac)
1272 silc_hmac_free(stream->send_hmac[0]);
1273 if (stream->receive_hmac[0] && receive_hmac)
1274 silc_hmac_free(stream->receive_hmac[0]);
1279 stream->send_key[0] = send_key;
1281 stream->receive_key[0] = receive_key;
1283 stream->send_hmac[0] = send_hmac;
1285 stream->receive_hmac[0] = receive_hmac;
1287 silc_mutex_unlock(stream->lock);
1291 /* Return current ciphers from packet stream */
1293 SilcBool silc_packet_get_keys(SilcPacketStream stream,
1294 SilcCipher *send_key,
1295 SilcCipher *receive_key,
1296 SilcHmac *send_hmac,
1297 SilcHmac *receive_hmac)
1299 if (!stream->send_key[0] && !stream->receive_key[0] &&
1300 !stream->send_hmac[0] && !stream->receive_hmac[0])
1303 silc_mutex_lock(stream->lock);
1306 *send_key = stream->send_key[0];
1308 *receive_key = stream->receive_key[0];
1310 *send_hmac = stream->send_hmac[0];
1312 *receive_hmac = stream->receive_hmac[0];
1314 silc_mutex_unlock(stream->lock);
1319 /* Set SILC IDs to packet stream */
1321 SilcBool silc_packet_set_ids(SilcPacketStream stream,
1322 SilcIdType src_id_type, const void *src_id,
1323 SilcIdType dst_id_type, const void *dst_id)
1326 unsigned char tmp[32];
1328 if (!src_id && !dst_id)
1331 silc_mutex_lock(stream->lock);
1334 SILC_LOG_DEBUG(("Setting source ID to packet stream %p", stream));
1336 silc_free(stream->src_id);
1337 if (!silc_id_id2str(src_id, src_id_type, tmp, sizeof(tmp), &len)) {
1338 silc_mutex_unlock(stream->lock);
1341 stream->src_id = silc_memdup(tmp, len);
1342 if (!stream->src_id) {
1343 silc_mutex_unlock(stream->lock);
1346 stream->src_id_type = src_id_type;
1347 stream->src_id_len = len;
1351 SILC_LOG_DEBUG(("Setting destination ID to packet stream %p", stream));
1353 silc_free(stream->dst_id);
1354 if (!silc_id_id2str(dst_id, dst_id_type, tmp, sizeof(tmp), &len)) {
1355 silc_mutex_unlock(stream->lock);
1358 stream->dst_id = silc_memdup(tmp, len);
1359 if (!stream->dst_id) {
1360 silc_mutex_unlock(stream->lock);
1363 stream->dst_id_type = dst_id_type;
1364 stream->dst_id_len = len;
1367 silc_mutex_unlock(stream->lock);
1372 /* Return IDs from the packet stream */
1374 SilcBool silc_packet_get_ids(SilcPacketStream stream,
1375 SilcBool *src_id_set, SilcID *src_id,
1376 SilcBool *dst_id_set, SilcID *dst_id)
1378 if (src_id && stream->src_id)
1379 if (!silc_id_str2id2(stream->src_id, stream->src_id_len,
1380 stream->src_id_type, src_id))
1383 if (stream->src_id && src_id_set)
1386 if (dst_id && stream->dst_id)
1387 if (!silc_id_str2id2(stream->dst_id, stream->dst_id_len,
1388 stream->dst_id_type, dst_id))
1391 if (stream->dst_id && dst_id_set)
1397 /* Adds Security ID (SID) */
1399 SilcBool silc_packet_set_sid(SilcPacketStream stream, SilcUInt8 sid)
1401 if (!stream->iv_included)
1404 SILC_LOG_DEBUG(("Set packet stream %p SID to %d", stream, sid));
1412 void silc_packet_free(SilcPacket packet)
1414 SilcPacketStream stream = packet->stream;
1416 SILC_LOG_DEBUG(("Freeing packet %p", packet));
1418 /* Check for double free */
1419 SILC_ASSERT(packet->stream != NULL);
1421 packet->stream = NULL;
1422 packet->src_id = packet->dst_id = NULL;
1423 silc_buffer_reset(&packet->buffer);
1425 silc_mutex_lock(stream->sc->engine->lock);
1427 /* Put the packet back to freelist */
1428 silc_list_add(stream->sc->engine->packet_pool, packet);
1429 if (silc_list_count(stream->sc->engine->packet_pool) == 1)
1430 silc_list_start(stream->sc->engine->packet_pool);
1432 silc_mutex_unlock(stream->sc->engine->lock);
1435 /****************************** Packet Sending ******************************/
1437 /* Prepare outgoing data buffer for packet sending. Returns the
1438 pointer to that buffer into the `packet'. */
1440 static inline SilcBool silc_packet_send_prepare(SilcPacketStream stream,
1445 unsigned char *oldptr;
1446 unsigned int mac_len = hmac ? silc_hmac_len(hmac) : 0;
1450 /* Allocate more space if needed */
1451 if (silc_unlikely(silc_buffer_taillen(&stream->outbuf) < totlen)) {
1452 if (!silc_buffer_realloc(&stream->outbuf,
1453 silc_buffer_truelen(&stream->outbuf) + totlen))
1457 /* Pull data area for the new packet, and return pointer to the start of
1458 the data area and save the pointer in to the `packet'. MAC is pulled
1459 later after it's computed. */
1460 oldptr = silc_buffer_pull_tail(&stream->outbuf, totlen);
1461 silc_buffer_set(packet, oldptr, totlen);
1462 silc_buffer_push_tail(packet, mac_len);
1467 /* Increments counter when encrypting in counter mode. */
1469 static inline void silc_packet_send_ctr_increment(SilcPacketStream stream,
1471 unsigned char *ret_iv)
1473 unsigned char *iv = silc_cipher_get_iv(cipher);
1474 SilcUInt32 pc1, pc2;
1476 /* Reset block counter */
1477 memset(iv + 12, 0, 4);
1479 /* If IV Included flag, return the 64-bit IV for inclusion in packet */
1480 if (stream->iv_included) {
1482 ret_iv[0] = silc_rng_get_byte_fast(stream->sc->engine->rng);
1483 ret_iv[1] = ret_iv[0] + iv[4];
1484 ret_iv[2] = ret_iv[0] ^ ret_iv[1];
1485 ret_iv[3] = ret_iv[0] + ret_iv[2];
1487 /* Increment 32-bit packet counter */
1488 SILC_GET32_MSB(pc1, iv + 8);
1490 SILC_PUT32_MSB(pc1, ret_iv + 4);
1492 SILC_LOG_HEXDUMP(("IV"), ret_iv, 8);
1494 /* Set new nonce to counter block */
1495 memcpy(iv + 4, ret_iv, 8);
1497 /* Increment 64-bit packet counter */
1498 SILC_GET32_MSB(pc1, iv + 4);
1499 SILC_GET32_MSB(pc2, iv + 8);
1502 SILC_PUT32_MSB(pc1, iv + 4);
1503 SILC_PUT32_MSB(pc2, iv + 8);
1506 SILC_LOG_HEXDUMP(("Counter Block"), iv, 16);
1509 /* Internal routine to assemble outgoing packet. Assembles and encryptes
1510 the packet. The silc_packet_stream_write needs to be called to send it
1511 after this returns TRUE. */
1513 static inline SilcBool silc_packet_send_raw(SilcPacketStream stream,
1514 SilcPacketType type,
1515 SilcPacketFlags flags,
1516 SilcIdType src_id_type,
1517 unsigned char *src_id,
1518 SilcUInt32 src_id_len,
1519 SilcIdType dst_id_type,
1520 unsigned char *dst_id,
1521 SilcUInt32 dst_id_len,
1522 const unsigned char *data,
1523 SilcUInt32 data_len,
1527 unsigned char tmppad[SILC_PACKET_MAX_PADLEN], iv[33], psn[4];
1528 int block_len = (cipher ? silc_cipher_get_block_len(cipher) : 0);
1529 int i, enclen, truelen, padlen = 0, ivlen = 0, psnlen = 0;
1531 SilcBufferStruct packet;
1533 SILC_LOG_DEBUG(("Sending packet %s (%d) flags %d, src %d dst %d, "
1534 "data len %d", silc_get_packet_name(type), stream->send_psn,
1535 flags, src_id_type, dst_id_type, data_len));
1537 /* Get the true length of the packet. This is saved as payload length
1538 into the packet header. This does not include the length of the
1540 data_len = SILC_PACKET_DATALEN(data_len, (SILC_PACKET_HEADER_LEN +
1541 src_id_len + dst_id_len));
1542 enclen = truelen = (data_len + SILC_PACKET_HEADER_LEN +
1543 src_id_len + dst_id_len);
1545 /* If using CTR mode, increment the counter */
1546 ctr = (cipher && silc_cipher_get_mode(cipher) == SILC_CIPHER_MODE_CTR);
1548 silc_packet_send_ctr_increment(stream, cipher, iv + 1);
1550 /* If IV is included, the SID, IV and sequence number is added to packet */
1551 if (stream->iv_included && cipher) {
1552 psnlen = sizeof(psn);
1554 iv[0] = stream->sid;
1557 /* If IV is included, the SID, IV and sequence number is added to packet */
1558 if (stream->iv_included && cipher) {
1559 psnlen = sizeof(psn);
1560 ivlen = block_len + 1;
1561 iv[0] = stream->sid;
1562 memcpy(iv + 1, silc_cipher_get_iv(cipher), block_len);
1566 /* We automatically figure out the packet structure from the packet
1567 type and flags, and calculate correct length. Private messages with
1568 private keys and channel messages are special packets as their
1569 payload is encrypted already. */
1570 if (type == SILC_PACKET_PRIVATE_MESSAGE &&
1571 flags & SILC_PACKET_FLAG_PRIVMSG_KEY) {
1572 /* Padding is calculated from header + IDs */
1574 SILC_PACKET_PADLEN((SILC_PACKET_HEADER_LEN + src_id_len + dst_id_len +
1575 psnlen), block_len, padlen);
1577 /* Length to encrypt, header + IDs + padding. */
1578 enclen = (SILC_PACKET_HEADER_LEN + src_id_len + dst_id_len +
1581 } else if (type == SILC_PACKET_CHANNEL_MESSAGE) {
1582 if (stream->sc->engine->local_is_router && stream->is_router) {
1583 /* Channel messages between routers are encrypted as normal packets.
1584 Padding is calculated from true length of the packet. */
1586 SILC_PACKET_PADLEN(truelen + psnlen, block_len, padlen);
1588 enclen += padlen + psnlen;
1590 /* Padding is calculated from header + IDs */
1592 SILC_PACKET_PADLEN((SILC_PACKET_HEADER_LEN + src_id_len + dst_id_len +
1593 psnlen), block_len, padlen);
1595 /* Length to encrypt, header + IDs + padding. */
1596 enclen = (SILC_PACKET_HEADER_LEN + src_id_len + dst_id_len +
1600 /* Padding is calculated from true length of the packet */
1601 if (flags & SILC_PACKET_FLAG_LONG_PAD)
1602 SILC_PACKET_PADLEN_MAX(truelen + psnlen, block_len, padlen);
1604 SILC_PACKET_PADLEN(truelen + psnlen, block_len, padlen);
1606 enclen += padlen + psnlen;
1609 /* Remove implementation specific flags */
1610 flags &= ~(SILC_PACKET_FLAG_LONG_PAD);
1612 /* Get random padding */
1613 for (i = 0; i < padlen; i++) tmppad[i] =
1614 silc_rng_get_byte_fast(stream->sc->engine->rng);
1616 silc_mutex_lock(stream->lock);
1618 /* Get packet pointer from the outgoing buffer */
1619 if (silc_unlikely(!silc_packet_send_prepare(stream, truelen + padlen + ivlen
1620 + psnlen, hmac, &packet))) {
1621 silc_mutex_unlock(stream->lock);
1625 SILC_PUT32_MSB(stream->send_psn, psn);
1627 /* Create the packet. This creates the SILC header, adds padding, and
1628 the actual packet data. */
1629 i = silc_buffer_format(&packet,
1630 SILC_STR_DATA(iv, ivlen),
1631 SILC_STR_DATA(psn, psnlen),
1632 SILC_STR_UI_SHORT(truelen),
1633 SILC_STR_UI_CHAR(flags),
1634 SILC_STR_UI_CHAR(type),
1635 SILC_STR_UI_CHAR(padlen),
1636 SILC_STR_UI_CHAR(0),
1637 SILC_STR_UI_CHAR(src_id_len),
1638 SILC_STR_UI_CHAR(dst_id_len),
1639 SILC_STR_UI_CHAR(src_id_type),
1640 SILC_STR_DATA(src_id, src_id_len),
1641 SILC_STR_UI_CHAR(dst_id_type),
1642 SILC_STR_DATA(dst_id, dst_id_len),
1643 SILC_STR_DATA(tmppad, padlen),
1644 SILC_STR_DATA(data, data_len),
1646 if (silc_unlikely(i < 0)) {
1647 silc_mutex_unlock(stream->lock);
1651 SILC_LOG_HEXDUMP(("Assembled packet, len %d", silc_buffer_len(&packet)),
1652 silc_buffer_data(&packet), silc_buffer_len(&packet));
1654 /* Encrypt the packet */
1655 if (silc_likely(cipher)) {
1656 SILC_LOG_DEBUG(("Encrypting packet"));
1657 silc_cipher_set_iv(cipher, NULL);
1658 if (silc_unlikely(!silc_cipher_encrypt(cipher, packet.data + ivlen,
1659 packet.data + ivlen, enclen,
1661 SILC_LOG_ERROR(("Packet encryption failed"));
1662 silc_mutex_unlock(stream->lock);
1668 if (silc_likely(hmac)) {
1671 /* MAC is computed from the entire encrypted packet data, and put
1672 to the end of the packet. */
1673 silc_hmac_init(hmac);
1674 silc_hmac_update(hmac, psn, sizeof(psn));
1675 silc_hmac_update(hmac, packet.data, silc_buffer_len(&packet));
1676 silc_hmac_final(hmac, packet.tail, &mac_len);
1677 silc_buffer_pull_tail(&packet, mac_len);
1684 /* Sends a packet */
1686 SilcBool silc_packet_send(SilcPacketStream stream,
1687 SilcPacketType type, SilcPacketFlags flags,
1688 const unsigned char *data, SilcUInt32 data_len)
1692 ret = silc_packet_send_raw(stream, type, flags,
1693 stream->src_id_type,
1696 stream->dst_id_type,
1700 stream->send_key[0],
1701 stream->send_hmac[0]);
1703 /* Write the packet to the stream */
1704 return ret ? silc_packet_stream_write(stream, FALSE) : FALSE;
1707 /* Sends a packet, extended routine */
1709 SilcBool silc_packet_send_ext(SilcPacketStream stream,
1710 SilcPacketType type, SilcPacketFlags flags,
1711 SilcIdType src_id_type, void *src_id,
1712 SilcIdType dst_id_type, void *dst_id,
1713 const unsigned char *data, SilcUInt32 data_len,
1714 SilcCipher cipher, SilcHmac hmac)
1716 unsigned char src_id_data[32], dst_id_data[32];
1717 SilcUInt32 src_id_len, dst_id_len;
1721 if (!silc_id_id2str(src_id, src_id_type, src_id_data,
1722 sizeof(src_id_data), &src_id_len))
1725 if (!silc_id_id2str(dst_id, dst_id_type, dst_id_data,
1726 sizeof(dst_id_data), &dst_id_len))
1729 ret = silc_packet_send_raw(stream, type, flags,
1730 src_id ? src_id_type : stream->src_id_type,
1731 src_id ? src_id_data : stream->src_id,
1732 src_id ? src_id_len : stream->src_id_len,
1733 dst_id ? dst_id_type : stream->dst_id_type,
1734 dst_id ? dst_id_data : stream->dst_id,
1735 dst_id ? dst_id_len : stream->dst_id_len,
1737 cipher ? cipher : stream->send_key[0],
1738 hmac ? hmac : stream->send_hmac[0]);
1740 /* Write the packet to the stream */
1741 return ret ? silc_packet_stream_write(stream, FALSE) : FALSE;
1744 /* Sends packet after formatting the arguments to buffer */
1746 SilcBool silc_packet_send_va(SilcPacketStream stream,
1747 SilcPacketType type, SilcPacketFlags flags, ...)
1749 SilcBufferStruct buf;
1753 va_start(va, flags);
1755 memset(&buf, 0, sizeof(buf));
1756 if (silc_buffer_format_vp(&buf, va) < 0) {
1761 ret = silc_packet_send(stream, type, flags, silc_buffer_data(&buf),
1762 silc_buffer_len(&buf));
1764 silc_buffer_purge(&buf);
1770 /* Sends packet after formatting the arguments to buffer, extended routine */
1772 SilcBool silc_packet_send_va_ext(SilcPacketStream stream,
1773 SilcPacketType type, SilcPacketFlags flags,
1774 SilcIdType src_id_type, void *src_id,
1775 SilcIdType dst_id_type, void *dst_id,
1776 SilcCipher cipher, SilcHmac hmac, ...)
1778 SilcBufferStruct buf;
1784 memset(&buf, 0, sizeof(buf));
1785 if (silc_buffer_format_vp(&buf, va) < 0) {
1790 ret = silc_packet_send_ext(stream, type, flags, src_id_type, src_id,
1791 dst_id_type, dst_id, silc_buffer_data(&buf),
1792 silc_buffer_len(&buf), cipher, hmac);
1794 silc_buffer_purge(&buf);
1800 /***************************** Packet Receiving *****************************/
1802 /* Checks MAC in the packet. Returns TRUE if MAC is Ok. */
1804 static inline SilcBool silc_packet_check_mac(SilcHmac hmac,
1805 const unsigned char *data,
1806 SilcUInt32 data_len,
1807 const unsigned char *packet_mac,
1808 const unsigned char *packet_seq,
1809 SilcUInt32 sequence)
1812 if (silc_likely(hmac)) {
1813 unsigned char mac[32], psn[4];
1816 SILC_LOG_DEBUG(("Verifying MAC"));
1818 /* Compute HMAC of packet */
1819 silc_hmac_init(hmac);
1822 SILC_PUT32_MSB(sequence, psn);
1823 silc_hmac_update(hmac, psn, 4);
1825 silc_hmac_update(hmac, packet_seq, 4);
1827 silc_hmac_update(hmac, data, data_len);
1828 silc_hmac_final(hmac, mac, &mac_len);
1830 /* Compare the MAC's */
1831 if (silc_unlikely(memcmp(packet_mac, mac, mac_len))) {
1832 SILC_LOG_DEBUG(("MAC failed"));
1836 SILC_LOG_DEBUG(("MAC is Ok"));
1842 /* Increments/sets counter when decrypting in counter mode. */
1844 static inline void silc_packet_receive_ctr_increment(SilcPacketStream stream,
1846 unsigned char *packet_iv)
1848 SilcUInt32 pc1, pc2;
1850 /* If IV Included flag, set the IV from packet to block counter. */
1851 if (stream->iv_included) {
1852 memcpy(iv + 4, packet_iv, 8);
1854 /* Increment 64-bit packet counter. */
1855 SILC_GET32_MSB(pc1, iv + 4);
1856 SILC_GET32_MSB(pc2, iv + 8);
1859 SILC_PUT32_MSB(pc1, iv + 4);
1860 SILC_PUT32_MSB(pc2, iv + 8);
1863 /* Reset block counter */
1864 memset(iv + 12, 0, 4);
1866 SILC_LOG_HEXDUMP(("Counter Block"), iv, 16);
1869 /* Decrypts SILC packet. Handles both normal and special packet decryption.
1870 Return 0 when packet is normal and 1 when it it special, -1 on error. */
1872 static inline int silc_packet_decrypt(SilcCipher cipher, SilcHmac hmac,
1873 SilcUInt32 sequence, SilcBuffer buffer,
1876 if (normal == TRUE) {
1877 if (silc_likely(cipher)) {
1878 /* Decrypt rest of the packet */
1879 SILC_LOG_DEBUG(("Decrypting the packet"));
1880 if (silc_unlikely(!silc_cipher_decrypt(cipher, buffer->data,
1882 silc_buffer_len(buffer), NULL)))
1888 /* Decrypt rest of the header plus padding */
1889 if (silc_likely(cipher)) {
1891 SilcUInt32 block_len = silc_cipher_get_block_len(cipher);
1893 SILC_LOG_DEBUG(("Decrypting the header"));
1895 /* Padding length + src id len + dst id len + header length - 16
1896 bytes already decrypted, gives the rest of the encrypted packet */
1897 silc_buffer_push(buffer, block_len);
1898 len = (((SilcUInt8)buffer->data[4] + (SilcUInt8)buffer->data[6] +
1899 (SilcUInt8)buffer->data[7] + SILC_PACKET_HEADER_LEN) -
1901 silc_buffer_pull(buffer, block_len);
1903 if (silc_unlikely(len > silc_buffer_len(buffer))) {
1904 SILC_LOG_ERROR(("Garbage in header of packet, bad packet length, "
1908 if (silc_unlikely(!silc_cipher_decrypt(cipher, buffer->data,
1909 buffer->data, len, NULL)))
1917 /* Parses the packet. This is called when a whole packet is ready to be
1918 parsed. The buffer sent must be already decrypted before calling this
1921 static inline SilcBool silc_packet_parse(SilcPacket packet)
1923 SilcBuffer buffer = &packet->buffer;
1924 SilcUInt8 padlen = (SilcUInt8)buffer->data[4];
1925 SilcUInt8 src_id_len, dst_id_len, src_id_type, dst_id_type;
1928 SILC_LOG_DEBUG(("Parsing incoming packet"));
1930 /* Parse the buffer. This parses the SILC header of the packet. */
1931 ret = silc_buffer_unformat(buffer,
1934 SILC_STR_UI_CHAR(&src_id_len),
1935 SILC_STR_UI_CHAR(&dst_id_len),
1936 SILC_STR_UI_CHAR(&src_id_type),
1938 if (silc_unlikely(ret == -1)) {
1939 if (!packet->stream->udp &&
1940 !silc_socket_stream_is_udp(packet->stream->stream, NULL))
1941 SILC_LOG_ERROR(("Malformed packet header, packet dropped"));
1945 if (silc_unlikely(src_id_len > SILC_PACKET_MAX_ID_LEN ||
1946 dst_id_len > SILC_PACKET_MAX_ID_LEN)) {
1947 if (!packet->stream->udp &&
1948 !silc_socket_stream_is_udp(packet->stream->stream, NULL))
1949 SILC_LOG_ERROR(("Bad ID lengths in packet (%d and %d)",
1950 packet->src_id_len, packet->dst_id_len));
1954 ret = silc_buffer_unformat(buffer,
1956 SILC_STR_DATA(&packet->src_id, src_id_len),
1957 SILC_STR_UI_CHAR(&dst_id_type),
1958 SILC_STR_DATA(&packet->dst_id, dst_id_len),
1959 SILC_STR_OFFSET(padlen),
1961 if (silc_unlikely(ret == -1)) {
1962 if (!packet->stream->udp &&
1963 !silc_socket_stream_is_udp(packet->stream->stream, NULL))
1964 SILC_LOG_ERROR(("Malformed packet header, packet dropped"));
1968 if (silc_unlikely(src_id_type > SILC_ID_CHANNEL ||
1969 dst_id_type > SILC_ID_CHANNEL)) {
1970 if (!packet->stream->udp &&
1971 !silc_socket_stream_is_udp(packet->stream->stream, NULL))
1972 SILC_LOG_ERROR(("Bad ID types in packet (%d and %d)",
1973 src_id_type, dst_id_type));
1977 packet->src_id_len = src_id_len;
1978 packet->dst_id_len = dst_id_len;
1979 packet->src_id_type = src_id_type;
1980 packet->dst_id_type = dst_id_type;
1982 SILC_LOG_HEXDUMP(("Parsed packet, len %d", silc_buffer_headlen(buffer) +
1983 silc_buffer_len(buffer)), buffer->head,
1984 silc_buffer_headlen(buffer) + silc_buffer_len(buffer));
1986 SILC_LOG_DEBUG(("Incoming packet type: %d (%s), flags %d", packet->type,
1987 silc_get_packet_name(packet->type), packet->flags));
1992 /* Dispatch packet to application. Called with stream->lock locked.
1993 Returns FALSE if the stream was destroyed while dispatching a packet. */
1995 static SilcBool silc_packet_dispatch(SilcPacket packet)
1997 SilcPacketStream stream = packet->stream;
1998 SilcPacketProcess p;
1999 SilcBool default_sent = FALSE;
2002 /* Dispatch packet to all packet processors that want it */
2004 if (silc_likely(!stream->process)) {
2005 /* Send to default processor as no others exist */
2006 SILC_LOG_DEBUG(("Dispatching packet to default callbacks"));
2007 silc_mutex_unlock(stream->lock);
2008 if (silc_unlikely(!stream->sc->engine->callbacks->
2009 packet_receive(stream->sc->engine, stream, packet,
2010 stream->sc->engine->callback_context,
2011 stream->stream_context)))
2012 silc_packet_free(packet);
2013 silc_mutex_lock(stream->lock);
2014 return stream->destroyed == FALSE;
2017 silc_dlist_start(stream->process);
2018 while ((p = silc_dlist_get(stream->process)) != SILC_LIST_END) {
2020 /* If priority is 0 or less, we send to default processor first
2021 because default processor has 0 priority */
2022 if (!default_sent && p->priority <= 0) {
2023 SILC_LOG_DEBUG(("Dispatching packet to default callbacks"));
2024 default_sent = TRUE;
2025 silc_mutex_unlock(stream->lock);
2026 if (stream->sc->engine->callbacks->
2027 packet_receive(stream->sc->engine, stream, packet,
2028 stream->sc->engine->callback_context,
2029 stream->stream_context)) {
2030 silc_mutex_lock(stream->lock);
2031 return stream->destroyed == FALSE;
2033 silc_mutex_lock(stream->lock);
2036 /* Send to processor */
2038 /* Send all packet types */
2039 SILC_LOG_DEBUG(("Dispatching packet to %p callbacks", p->callbacks));
2040 silc_mutex_unlock(stream->lock);
2041 if (p->callbacks->packet_receive(stream->sc->engine, stream, packet,
2042 p->callback_context,
2043 stream->stream_context)) {
2044 silc_mutex_lock(stream->lock);
2045 return stream->destroyed == FALSE;
2047 silc_mutex_lock(stream->lock);
2049 /* Send specific types */
2050 for (pt = p->types; *pt; pt++) {
2051 if (*pt != packet->type)
2053 SILC_LOG_DEBUG(("Dispatching packet to %p callbacks", p->callbacks));
2054 silc_mutex_unlock(stream->lock);
2055 if (p->callbacks->packet_receive(stream->sc->engine, stream, packet,
2056 p->callback_context,
2057 stream->stream_context)) {
2058 silc_mutex_lock(stream->lock);
2059 return stream->destroyed == FALSE;
2061 silc_mutex_lock(stream->lock);
2067 if (!default_sent) {
2068 /* Send to default processor as it has not been sent yet */
2069 SILC_LOG_DEBUG(("Dispatching packet to default callbacks"));
2070 silc_mutex_unlock(stream->lock);
2071 if (stream->sc->engine->callbacks->
2072 packet_receive(stream->sc->engine, stream, packet,
2073 stream->sc->engine->callback_context,
2074 stream->stream_context)) {
2075 silc_mutex_lock(stream->lock);
2076 return stream->destroyed == FALSE;
2078 silc_mutex_lock(stream->lock);
2081 /* If we got here, no one wanted the packet, so drop it */
2082 silc_packet_free(packet);
2083 return stream->destroyed == FALSE;
2086 /* Process incoming data and parse packets. Called with stream->lock
2089 static void silc_packet_read_process(SilcPacketStream stream)
2096 SilcUInt16 packetlen;
2097 SilcUInt32 paddedlen, mac_len, block_len, ivlen, psnlen;
2098 unsigned char tmp[SILC_PACKET_MIN_HEADER_LEN], *header;
2099 unsigned char iv[SILC_CIPHER_MAX_IV_SIZE], *packet_seq = NULL;
2103 /* Get inbuf. If there is already some data for this stream in the buffer
2104 we already have it. Otherwise get the current one from list, it will
2105 include the data. */
2106 inbuf = stream->inbuf;
2108 silc_dlist_start(stream->sc->inbufs);
2109 inbuf = silc_dlist_get(stream->sc->inbufs);
2112 /* Parse the packets from the data */
2113 while (silc_buffer_len(inbuf) > 0) {
2115 cipher = stream->receive_key[0];
2116 hmac = stream->receive_hmac[0];
2119 if (silc_unlikely(silc_buffer_len(inbuf) <
2120 (stream->iv_included ? SILC_PACKET_MIN_HEADER_LEN_IV :
2121 SILC_PACKET_MIN_HEADER_LEN))) {
2122 SILC_LOG_DEBUG(("Partial packet in queue, waiting for the rest"));
2123 silc_dlist_del(stream->sc->inbufs, inbuf);
2124 stream->inbuf = inbuf;
2128 if (silc_likely(hmac))
2129 mac_len = silc_hmac_len(hmac);
2133 /* Decrypt first block of the packet to get the length field out */
2134 if (silc_likely(cipher)) {
2135 block_len = silc_cipher_get_block_len(cipher);
2137 if (stream->iv_included) {
2138 /* SID, IV and sequence number is included in the ciphertext */
2139 sid = (SilcUInt8)inbuf->data[0];
2141 if (silc_cipher_get_mode(cipher) == SILC_CIPHER_MODE_CTR) {
2142 /* Set the CTR mode IV from packet to counter block */
2143 memcpy(iv, silc_cipher_get_iv(cipher), block_len);
2144 silc_packet_receive_ctr_increment(stream, iv, inbuf->data + 1);
2147 /* Get IV from packet */
2148 memcpy(iv, inbuf->data + 1, block_len);
2149 ivlen = block_len + 1;
2153 /* Check SID, and get correct decryption key */
2154 if (sid != stream->sid) {
2155 /* If SID is recent get the previous key and use it */
2156 if (sid > 0 && stream->sid > 0 && stream->sid - 1 == sid &&
2157 stream->receive_key[1] && !stream->receive_hmac[1]) {
2158 cipher = stream->receive_key[1];
2159 hmac = stream->receive_hmac[1];
2161 /* The SID is unknown, drop rest of the data in buffer */
2162 SILC_LOG_DEBUG(("Unknown Security ID %d in packet, expected %d",
2164 silc_mutex_unlock(stream->lock);
2165 SILC_PACKET_CALLBACK_ERROR(stream, SILC_PACKET_ERR_UNKNOWN_SID);
2166 silc_mutex_lock(stream->lock);
2171 memcpy(iv, silc_cipher_get_iv(cipher), block_len);
2173 /* If using CTR mode, increment the counter */
2174 if (silc_cipher_get_mode(cipher) == SILC_CIPHER_MODE_CTR)
2175 silc_packet_receive_ctr_increment(stream, iv, NULL);
2178 if (silc_cipher_get_mode(cipher) == SILC_CIPHER_MODE_CTR)
2179 silc_cipher_set_iv(cipher, NULL);
2180 silc_cipher_decrypt(cipher, inbuf->data + ivlen, tmp, block_len, iv);
2183 if (stream->iv_included) {
2184 /* Take sequence number from packet */
2185 packet_seq = header;
2189 /* Unencrypted packet */
2190 block_len = SILC_PACKET_MIN_HEADER_LEN;
2191 header = inbuf->data;
2194 /* Get packet length and full packet length with padding */
2195 SILC_PACKET_LENGTH(header, packetlen, paddedlen);
2198 if (silc_unlikely(packetlen < SILC_PACKET_MIN_LEN)) {
2199 if (!stream->udp && !silc_socket_stream_is_udp(stream->stream, NULL))
2200 SILC_LOG_ERROR(("Received too short packet"));
2201 silc_mutex_unlock(stream->lock);
2202 SILC_PACKET_CALLBACK_ERROR(stream, SILC_PACKET_ERR_MALFORMED);
2203 silc_mutex_lock(stream->lock);
2204 memset(tmp, 0, sizeof(tmp));
2208 if (silc_buffer_len(inbuf) < paddedlen + ivlen + mac_len) {
2209 SILC_LOG_DEBUG(("Received partial packet, waiting for the rest "
2211 paddedlen + mac_len - silc_buffer_len(inbuf)));
2212 memset(tmp, 0, sizeof(tmp));
2213 silc_dlist_del(stream->sc->inbufs, inbuf);
2214 stream->inbuf = inbuf;
2218 /* Check MAC of the packet */
2219 if (silc_unlikely(!silc_packet_check_mac(hmac, inbuf->data,
2221 inbuf->data + ivlen +
2222 paddedlen, packet_seq,
2223 stream->receive_psn))) {
2224 silc_mutex_unlock(stream->lock);
2225 SILC_PACKET_CALLBACK_ERROR(stream, SILC_PACKET_ERR_MAC_FAILED);
2226 silc_mutex_lock(stream->lock);
2227 memset(tmp, 0, sizeof(tmp));
2232 packet = silc_packet_alloc(stream->sc->engine);
2233 if (silc_unlikely(!packet)) {
2234 silc_mutex_unlock(stream->lock);
2235 SILC_PACKET_CALLBACK_ERROR(stream, SILC_PACKET_ERR_NO_MEMORY);
2236 silc_mutex_lock(stream->lock);
2237 memset(tmp, 0, sizeof(tmp));
2240 packet->stream = stream;
2242 /* Allocate more space to packet buffer, if needed */
2243 if (silc_unlikely(silc_buffer_truelen(&packet->buffer) < paddedlen)) {
2244 if (!silc_buffer_realloc(&packet->buffer,
2245 silc_buffer_truelen(&packet->buffer) +
2247 silc_buffer_truelen(&packet->buffer)))) {
2248 silc_mutex_unlock(stream->lock);
2249 SILC_PACKET_CALLBACK_ERROR(stream, SILC_PACKET_ERR_NO_MEMORY);
2250 silc_mutex_lock(stream->lock);
2251 silc_packet_free(packet);
2252 memset(tmp, 0, sizeof(tmp));
2257 /* Parse packet header */
2258 packet->flags = (SilcPacketFlags)header[2];
2259 packet->type = (SilcPacketType)header[3];
2261 if (stream->sc->engine->local_is_router) {
2262 if (packet->type == SILC_PACKET_PRIVATE_MESSAGE &&
2263 (packet->flags & SILC_PACKET_FLAG_PRIVMSG_KEY))
2265 else if (packet->type != SILC_PACKET_CHANNEL_MESSAGE ||
2266 (packet->type == SILC_PACKET_CHANNEL_MESSAGE &&
2267 stream->is_router == TRUE))
2270 if (packet->type == SILC_PACKET_PRIVATE_MESSAGE &&
2271 (packet->flags & SILC_PACKET_FLAG_PRIVMSG_KEY))
2273 else if (packet->type != SILC_PACKET_CHANNEL_MESSAGE)
2277 SILC_LOG_HEXDUMP(("Incoming packet (%d) len %d",
2278 stream->receive_psn, paddedlen + ivlen + mac_len),
2279 inbuf->data, paddedlen + ivlen + mac_len);
2281 /* Put the decrypted part, and rest of the encrypted data, and decrypt */
2282 silc_buffer_pull_tail(&packet->buffer, paddedlen);
2283 silc_buffer_put(&packet->buffer, header, block_len - psnlen);
2284 silc_buffer_pull(&packet->buffer, block_len - psnlen);
2285 silc_buffer_put(&packet->buffer, (inbuf->data + ivlen +
2286 psnlen + (block_len - psnlen)),
2287 paddedlen - ivlen - psnlen - (block_len - psnlen));
2288 if (silc_likely(cipher)) {
2289 silc_cipher_set_iv(cipher, iv);
2290 ret = silc_packet_decrypt(cipher, hmac, stream->receive_psn,
2291 &packet->buffer, normal);
2292 if (silc_unlikely(ret < 0)) {
2293 silc_mutex_unlock(stream->lock);
2294 SILC_PACKET_CALLBACK_ERROR(stream, SILC_PACKET_ERR_DECRYPTION_FAILED);
2295 silc_mutex_lock(stream->lock);
2296 silc_packet_free(packet);
2297 memset(tmp, 0, sizeof(tmp));
2301 stream->receive_psn++;
2303 silc_buffer_push(&packet->buffer, block_len);
2305 /* Pull the packet from inbuf thus we'll get the next one in the inbuf. */
2306 silc_buffer_pull(inbuf, paddedlen + mac_len);
2308 /* Parse the packet */
2309 if (silc_unlikely(!silc_packet_parse(packet))) {
2310 silc_mutex_unlock(stream->lock);
2311 SILC_PACKET_CALLBACK_ERROR(stream, SILC_PACKET_ERR_MALFORMED);
2312 silc_mutex_lock(stream->lock);
2313 silc_packet_free(packet);
2314 memset(tmp, 0, sizeof(tmp));
2318 /* Dispatch the packet to application */
2319 if (!silc_packet_dispatch(packet))
2324 /* Add inbuf back to free list, if we owned it. */
2325 if (stream->inbuf) {
2326 silc_dlist_add(stream->sc->inbufs, inbuf);
2327 stream->inbuf = NULL;
2330 silc_buffer_reset(inbuf);
2333 /****************************** Packet Waiting ******************************/
2335 /* Packet wait receive callback */
2337 silc_packet_wait_packet_receive(SilcPacketEngine engine,
2338 SilcPacketStream stream,
2340 void *callback_context,
2341 void *stream_context);
2343 /* Packet waiting callbacks */
2344 static SilcPacketCallbacks silc_packet_wait_cbs =
2346 silc_packet_wait_packet_receive, NULL, NULL
2349 /* Packet waiting context */
2351 SilcMutex wait_lock;
2353 SilcList packet_queue;
2354 unsigned char id[28];
2355 unsigned int id_type : 2;
2356 unsigned int id_len : 5;
2357 unsigned int stopped : 1;
2360 /* Packet wait receive callback */
2363 silc_packet_wait_packet_receive(SilcPacketEngine engine,
2364 SilcPacketStream stream,
2366 void *callback_context,
2367 void *stream_context)
2369 SilcPacketWait pw = callback_context;
2371 /* If source ID is specified check for it */
2373 if (pw->id_type != packet->src_id_type ||
2374 memcmp(pw->id, packet->src_id, pw->id_len))
2378 /* Signal the waiting thread for a new packet */
2379 silc_mutex_lock(pw->wait_lock);
2381 if (silc_unlikely(pw->stopped)) {
2382 silc_mutex_unlock(pw->wait_lock);
2386 silc_list_add(pw->packet_queue, packet);
2387 silc_cond_broadcast(pw->wait_cond);
2389 silc_mutex_unlock(pw->wait_lock);
2394 /* Initialize packet waiting */
2396 void *silc_packet_wait_init(SilcPacketStream stream,
2397 const SilcID *source_id, ...)
2403 pw = silc_calloc(1, sizeof(*pw));
2407 /* Allocate mutex and conditional variable */
2408 if (!silc_mutex_alloc(&pw->wait_lock)) {
2412 if (!silc_cond_alloc(&pw->wait_cond)) {
2413 silc_mutex_free(pw->wait_lock);
2418 /* Link to the packet stream for the requested packet types */
2419 va_start(ap, source_id);
2420 ret = silc_packet_stream_link_va(stream, &silc_packet_wait_cbs, pw,
2424 silc_cond_free(pw->wait_cond);
2425 silc_mutex_free(pw->wait_lock);
2430 /* Initialize packet queue */
2431 silc_list_init(pw->packet_queue, struct SilcPacketStruct, next);
2435 silc_id_id2str(SILC_ID_GET_ID(*source_id), source_id->type, pw->id,
2436 sizeof(pw->id), &id_len);
2437 pw->id_type = source_id->type;
2438 pw->id_len = id_len;
2444 /* Uninitialize packet waiting */
2446 void silc_packet_wait_uninit(void *waiter, SilcPacketStream stream)
2448 SilcPacketWait pw = waiter;
2451 /* Signal any threads to stop waiting */
2452 silc_mutex_lock(pw->wait_lock);
2454 silc_cond_broadcast(pw->wait_cond);
2455 silc_mutex_unlock(pw->wait_lock);
2456 silc_thread_yield();
2458 /* Re-acquire lock and free resources */
2459 silc_mutex_lock(pw->wait_lock);
2460 silc_packet_stream_unlink(stream, &silc_packet_wait_cbs, pw);
2462 /* Free any remaining packets */
2463 silc_list_start(pw->packet_queue);
2464 while ((packet = silc_list_get(pw->packet_queue)) != SILC_LIST_END)
2465 silc_packet_free(packet);
2467 silc_mutex_unlock(pw->wait_lock);
2468 silc_cond_free(pw->wait_cond);
2469 silc_mutex_free(pw->wait_lock);
2473 /* Blocks thread until a packet has been received. */
2475 int silc_packet_wait(void *waiter, int timeout, SilcPacket *return_packet)
2477 SilcPacketWait pw = waiter;
2478 SilcBool ret = FALSE;
2480 silc_mutex_lock(pw->wait_lock);
2482 /* Wait here until packet has arrived */
2483 while (silc_list_count(pw->packet_queue) == 0) {
2484 if (silc_unlikely(pw->stopped)) {
2485 silc_mutex_unlock(pw->wait_lock);
2488 ret = silc_cond_timedwait(pw->wait_cond, pw->wait_lock, timeout);
2492 silc_list_start(pw->packet_queue);
2493 *return_packet = silc_list_get(pw->packet_queue);
2494 silc_list_del(pw->packet_queue, *return_packet);
2496 silc_mutex_unlock(pw->wait_lock);
2498 return ret == TRUE ? 1 : 0;
2501 /************************** Packet Stream Wrapper ***************************/
2503 /* Packet stream wrapper receive callback */
2505 silc_packet_wrap_packet_receive(SilcPacketEngine engine,
2506 SilcPacketStream stream,
2508 void *callback_context,
2509 void *stream_context);
2511 const SilcStreamOps silc_packet_stream_ops;
2513 /* Packet stream wrapper context */
2515 const SilcStreamOps *ops;
2516 SilcPacketStream stream;
2518 void *waiter; /* Waiter context in blocking mode */
2519 SilcPacketWrapCoder coder;
2520 void *coder_context;
2522 SilcStreamNotifier callback;
2525 SilcPacketType type;
2526 SilcPacketFlags flags;
2527 unsigned int closed : 1;
2528 unsigned int blocking : 1;
2529 unsigned int read_more : 1;
2530 } *SilcPacketWrapperStream;
2532 /* Packet wrapper callbacks */
2533 static SilcPacketCallbacks silc_packet_wrap_cbs =
2535 silc_packet_wrap_packet_receive, NULL, NULL
2538 /* Packet stream wrapper receive callback, non-blocking mode */
2541 silc_packet_wrap_packet_receive(SilcPacketEngine engine,
2542 SilcPacketStream stream,
2544 void *callback_context,
2545 void *stream_context)
2547 SilcPacketWrapperStream pws = callback_context;
2549 if (pws->closed || !pws->callback)
2552 silc_mutex_lock(pws->lock);
2553 silc_list_add(pws->in_queue, packet);
2554 silc_mutex_unlock(pws->lock);
2556 /* Call notifier callback */
2557 pws->callback((SilcStream)pws, SILC_STREAM_CAN_READ, pws->context);
2562 /* Task callback to notify more data is available for reading */
2564 SILC_TASK_CALLBACK(silc_packet_wrap_read_more)
2566 SilcPacketWrapperStream pws = context;
2568 if (pws->closed || !pws->callback)
2571 /* Call notifier callback */
2572 pws->callback((SilcStream)pws, SILC_STREAM_CAN_READ, pws->context);
2575 /* Read SILC packet */
2577 int silc_packet_wrap_read(SilcStream stream, unsigned char *buf,
2580 SilcPacketWrapperStream pws = stream;
2582 SilcBool read_more = FALSE;
2588 if (pws->blocking) {
2589 /* Block until packet is received */
2590 if ((silc_packet_wait(pws->waiter, 0, &packet)) < 0)
2595 /* Non-blocking mode */
2596 silc_mutex_lock(pws->lock);
2597 if (!silc_list_count(pws->in_queue)) {
2598 silc_mutex_unlock(pws->lock);
2602 silc_list_start(pws->in_queue);
2603 packet = silc_list_get(pws->in_queue);
2604 silc_list_del(pws->in_queue, packet);
2605 silc_mutex_unlock(pws->lock);
2608 /* Call decoder if set */
2609 if (pws->coder && !pws->read_more)
2610 pws->coder(stream, SILC_STREAM_CAN_READ, &packet->buffer,
2611 pws->coder_context);
2613 len = silc_buffer_len(&packet->buffer);
2614 if (len > buf_len) {
2620 memcpy(buf, packet->buffer.data, len);
2622 if (read_more && !pws->blocking) {
2623 /* More data will be available (in blocking mode not supported). */
2624 silc_buffer_pull(&packet->buffer, len);
2625 silc_list_insert(pws->in_queue, NULL, packet);
2626 silc_schedule_task_add_timeout(pws->stream->sc->schedule,
2627 silc_packet_wrap_read_more, pws, 0, 0);
2628 pws->read_more = TRUE;
2632 pws->read_more = FALSE;
2633 silc_packet_free(packet);
2637 /* Write SILC packet */
2639 int silc_packet_wrap_write(SilcStream stream, const unsigned char *data,
2640 SilcUInt32 data_len)
2642 SilcPacketWrapperStream pws = stream;
2643 SilcBool ret = FALSE;
2645 /* Call encoder if set */
2647 silc_buffer_reset(pws->encbuf);
2648 ret = pws->coder(stream, SILC_STREAM_CAN_WRITE, pws->encbuf,
2649 pws->coder_context);
2652 /* Send the SILC packet */
2654 if (!silc_packet_send_va(pws->stream, pws->type, pws->flags,
2655 SILC_STR_DATA(silc_buffer_data(pws->encbuf),
2656 silc_buffer_len(pws->encbuf)),
2657 SILC_STR_DATA(data, data_len),
2661 if (!silc_packet_send(pws->stream, pws->type, pws->flags, data, data_len))
2670 SilcBool silc_packet_wrap_close(SilcStream stream)
2672 SilcPacketWrapperStream pws = stream;
2677 if (pws->blocking) {
2678 /* Close packet waiter */
2679 silc_packet_wait_uninit(pws->waiter, pws->stream);
2683 silc_packet_stream_unlink(pws->stream, &silc_packet_wrap_cbs, pws);
2690 /* Destroy wrapper stream */
2692 void silc_packet_wrap_destroy(SilcStream stream)
2695 SilcPacketWrapperStream pws = stream;
2698 SILC_LOG_DEBUG(("Destroying wrapped packet stream %p", pws));
2700 silc_stream_close(stream);
2701 silc_list_start(pws->in_queue);
2702 while ((packet = silc_list_get(pws->in_queue)))
2703 silc_packet_free(packet);
2705 silc_mutex_free(pws->lock);
2707 silc_buffer_free(pws->encbuf);
2708 silc_packet_stream_unref(pws->stream);
2713 /* Link stream to receive packets */
2715 SilcBool silc_packet_wrap_notifier(SilcStream stream,
2716 SilcSchedule schedule,
2717 SilcStreamNotifier callback,
2720 SilcPacketWrapperStream pws = stream;
2722 if (pws->closed || pws->blocking)
2725 /* Link to receive packets */
2727 silc_packet_stream_link(pws->stream, &silc_packet_wrap_cbs, pws,
2728 100000, pws->type, -1);
2730 silc_packet_stream_unlink(pws->stream, &silc_packet_wrap_cbs, pws);
2732 pws->callback = callback;
2733 pws->context = context;
2738 /* Return schedule */
2740 SilcSchedule silc_packet_wrap_get_schedule(SilcStream stream)
2745 /* Wraps packet stream into SilcStream. */
2747 SilcStream silc_packet_stream_wrap(SilcPacketStream stream,
2748 SilcPacketType type,
2749 SilcPacketFlags flags,
2750 SilcBool blocking_mode,
2751 SilcPacketWrapCoder coder,
2754 SilcPacketWrapperStream pws;
2756 pws = silc_calloc(1, sizeof(*pws));
2760 SILC_LOG_DEBUG(("Wrapping packet stream %p to stream %p", stream, pws));
2762 pws->ops = &silc_packet_stream_ops;
2763 pws->stream = stream;
2766 pws->blocking = blocking_mode;
2768 pws->coder_context = context;
2770 /* Allocate small amount for encoder buffer. */
2772 pws->encbuf = silc_buffer_alloc(8);
2774 if (pws->blocking) {
2775 /* Blocking mode. Use packet waiter to do the thing. */
2776 pws->waiter = silc_packet_wait_init(pws->stream, NULL, pws->type, -1);
2782 /* Non-blocking mode */
2783 silc_mutex_alloc(&pws->lock);
2784 silc_list_init(pws->in_queue, struct SilcPacketStruct, next);
2787 silc_packet_stream_ref(stream);
2789 return (SilcStream)pws;
2792 const SilcStreamOps silc_packet_stream_ops =
2794 silc_packet_wrap_read,
2795 silc_packet_wrap_write,
2796 silc_packet_wrap_close,
2797 silc_packet_wrap_destroy,
2798 silc_packet_wrap_notifier,
2799 silc_packet_wrap_get_schedule,