5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2001 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
24 #include "silcincludes.h"
26 /******************************************************************************
28 Packet Sending Routines
30 ******************************************************************************/
32 /* Actually sends the packet. This flushes the connections outgoing data
33 buffer. If data is sent directly to the network this returns the bytes
34 written, if error occured this returns -1 and if the data could not
35 be written directly to the network at this time this returns -2, in
36 which case the data should be queued by the caller and sent at some
37 later time. If `force_send' is TRUE this attempts to write the data
38 directly to the network, if FALSE, this returns -2. */
40 int silc_packet_send(SilcSocketConnection sock, bool force_send)
42 SILC_LOG_DEBUG(("Sending packet to %s:%d [%s]", sock->hostname,
44 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
45 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
46 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
49 /* Send now if forced to do so */
50 if (force_send == TRUE) {
53 SILC_LOG_DEBUG(("Forcing packet send, packet sent immediately"));
55 /* Write to network */
56 ret = silc_socket_write(sock);
59 SILC_LOG_ERROR(("Error sending packet, dropped"));
64 SILC_LOG_DEBUG(("Could not force the send, packet put to queue"));
67 SILC_LOG_DEBUG(("Packet in queue"));
72 /* Encrypts a packet. This also creates HMAC of the packet before
73 encryption and adds the HMAC at the end of the buffer. This assumes
74 that there is enough free space at the end of the buffer to add the
75 computed HMAC. This is the normal way of encrypting packets, if some
76 other process of HMAC computing and encryption is needed this function
79 void silc_packet_encrypt(SilcCipher cipher, SilcHmac hmac, uint32 sequence,
80 SilcBuffer buffer, uint32 len)
82 unsigned char mac[32];
85 /* Compute HMAC. This assumes that HMAC is created from the entire
86 data area thus this uses the length found in buffer, not the length
92 SILC_PUT32_MSB(sequence, psn);
93 silc_hmac_update(hmac, psn, 4);
94 silc_hmac_update(hmac, buffer->data, buffer->len);
95 silc_hmac_final(hmac, mac, &mac_len);
96 silc_buffer_put_tail(buffer, mac, mac_len);
97 memset(mac, 0, sizeof(mac));
100 /* Encrypt the data area of the packet. */
102 SILC_LOG_DEBUG(("Encrypting packet, cipher %s, len %d",
103 cipher->cipher->name, len));
104 silc_cipher_encrypt(cipher, buffer->data, buffer->data, len, cipher->iv);
107 /* Pull the HMAC into the visible data area in the buffer */
109 silc_buffer_pull_tail(buffer, mac_len);
112 /* Assembles a new packet to be ready for send out. The buffer sent as
113 argument must include the data to be sent and it must not be encrypted.
114 The packet also must have enough free space so that the SILC header
115 and padding maybe added to the packet. The packet is encrypted after
116 this function has returned.
118 The buffer sent as argument should be something like following:
120 --------------------------------------------
121 | head | data | tail |
122 --------------------------------------------
126 So that the SILC header and 1 - 16 bytes of padding can fit to
127 the buffer. After assembly the buffer might look like this:
129 --------------------------------------------
131 --------------------------------------------
133 Start of assembled packet
135 Packet construct is as follows:
138 2 bytes Payload length
141 1 byte Padding length
143 1 bytes Source ID Length
144 1 bytes Destination ID Length
145 1 byte Source ID Type
147 1 byte Destination ID Type
148 n bytes Destination ID
154 All fields in the packet will be authenticated by MAC. The MAC is
155 not computed here, it must be computed separately before encrypting
160 void silc_packet_assemble(SilcPacketContext *ctx, SilcCipher cipher)
162 unsigned char tmppad[SILC_PACKET_MAX_PADLEN];
163 int block_len = cipher ? silc_cipher_get_block_len(cipher) : 0;
166 SILC_LOG_DEBUG(("Assembling outgoing packet"));
168 /* Get the true length of the packet. This is saved as payload length
169 into the packet header. This does not include the length of the
172 ctx->truelen = ctx->buffer->len + SILC_PACKET_HEADER_LEN +
173 ctx->src_id_len + ctx->dst_id_len;
175 /* Calculate the length of the padding. The padding is calculated from
176 the data that will be encrypted. */
179 ctx->padlen = SILC_PACKET_PADLEN_MAX(ctx->truelen);
181 ctx->padlen = SILC_PACKET_PADLEN(ctx->truelen, block_len);
184 /* Put the start of the data section to the right place. */
185 silc_buffer_push(ctx->buffer, SILC_PACKET_HEADER_LEN +
186 ctx->src_id_len + ctx->dst_id_len + ctx->padlen);
188 /* Get random padding */
190 for (i = 0; i < ctx->padlen; i++) tmppad[i] = silc_rng_global_get_byte();
192 /* XXX: For testing - to be removed */
193 memset(tmppad, 65, sizeof(tmppad));
196 /* Create the packet. This creates the SILC header and adds padding,
197 rest of the buffer remains as it is. */
198 silc_buffer_format(ctx->buffer,
199 SILC_STR_UI_SHORT(ctx->truelen),
200 SILC_STR_UI_CHAR(ctx->flags),
201 SILC_STR_UI_CHAR(ctx->type),
202 SILC_STR_UI_CHAR(ctx->padlen),
204 SILC_STR_UI_CHAR(ctx->src_id_len),
205 SILC_STR_UI_CHAR(ctx->dst_id_len),
206 SILC_STR_UI_CHAR(ctx->src_id_type),
207 SILC_STR_UI_XNSTRING(ctx->src_id, ctx->src_id_len),
208 SILC_STR_UI_CHAR(ctx->dst_id_type),
209 SILC_STR_UI_XNSTRING(ctx->dst_id, ctx->dst_id_len),
210 SILC_STR_UI_XNSTRING(tmppad, ctx->padlen),
213 SILC_LOG_HEXDUMP(("Assembled packet, len %d", ctx->buffer->len),
214 ctx->buffer->data, ctx->buffer->len);
216 SILC_LOG_DEBUG(("Outgoing packet assembled"));
219 /* Prepare outgoing data buffer for packet sending. This moves the data
220 area so that new packet may be added into it. If needed this allocates
221 more space to the buffer. This handles directly the connection's
222 outgoing buffer in SilcSocketConnection object. */
224 void silc_packet_send_prepare(SilcSocketConnection sock,
231 totlen = header_len + padlen + data_len;
233 /* Prepare the outgoing buffer for packet sending. */
235 /* Allocate new buffer. This is done only once per connection. */
236 SILC_LOG_DEBUG(("Allocating outgoing data buffer"));
238 if (totlen > SILC_PACKET_DEFAULT_SIZE)
239 sock->outbuf = silc_buffer_alloc(totlen);
241 sock->outbuf = silc_buffer_alloc(SILC_PACKET_DEFAULT_SIZE);
242 silc_buffer_pull_tail(sock->outbuf, totlen);
243 silc_buffer_pull(sock->outbuf, header_len + padlen);
245 if (SILC_IS_OUTBUF_PENDING(sock)) {
246 /* There is some pending data in the buffer. */
248 /* Allocate more space if needed */
249 if ((sock->outbuf->end - sock->outbuf->tail) <
251 SILC_LOG_DEBUG(("Reallocating outgoing data buffer"));
252 sock->outbuf = silc_buffer_realloc(sock->outbuf,
253 sock->outbuf->truelen +
257 oldlen = sock->outbuf->len;
258 silc_buffer_pull_tail(sock->outbuf, totlen);
259 silc_buffer_pull(sock->outbuf, header_len + padlen + oldlen);
261 /* Buffer is free for use */
262 silc_buffer_clear(sock->outbuf);
264 /* Allocate more space if needed */
265 if ((sock->outbuf->end - sock->outbuf->tail) < (totlen + 20)) {
266 SILC_LOG_DEBUG(("Reallocating outgoing data buffer"));
267 sock->outbuf = silc_buffer_realloc(sock->outbuf,
268 sock->outbuf->truelen +
272 silc_buffer_pull_tail(sock->outbuf, totlen);
273 silc_buffer_pull(sock->outbuf, header_len + padlen);
278 /******************************************************************************
280 Packet Reception Routines
282 ******************************************************************************/
284 static int silc_packet_decrypt(SilcCipher cipher, SilcHmac hmac,
285 uint32 sequence, SilcBuffer buffer,
288 /* Receives packet from network and reads the data into connection's
289 incoming data buffer. If the data was read directly this returns the
290 read bytes, if error occured this returns -1, if the data could not
291 be read directly at this time this returns -2 in which case the data
292 should be read again at some later time, or If EOF occured this returns
295 int silc_packet_receive(SilcSocketConnection sock)
299 SILC_LOG_DEBUG(("Receiving packet from %s:%d [%s]", sock->hostname,
301 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
302 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
303 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
306 /* Read some data from connection */
307 ret = silc_socket_read(sock);
312 /* Processes and decrypts the incmoing data, and calls parser callback
313 for each received packet that will handle the actual packet parsing.
314 If more than one packet was received this calls the parser multiple
315 times. The parser callback will get context SilcPacketParserContext
316 that includes the packet and the `parser_context' sent to this
319 The `local_is_router' indicates whether the caller is router server
320 in which case the receiving process of a certain packet types may
321 be special. Normal server and client must set it to FALSE. The
322 SilcPacketParserContext will indicate also whether the received
323 packet was normal or special packet. */
325 void silc_packet_receive_process(SilcSocketConnection sock,
326 bool local_is_router,
327 SilcCipher cipher, SilcHmac hmac,
329 SilcPacketParserCallback parser,
330 void *parser_context)
332 SilcPacketParserContext *parse_ctx;
333 int packetlen, paddedlen, mac_len = 0;
334 int block_len = cipher ? silc_cipher_get_block_len(cipher) : 0;
336 if (sock->inbuf->len < SILC_PACKET_MIN_HEADER_LEN)
340 mac_len = silc_hmac_len(hmac);
342 /* Parse the packets from the data */
343 while (sock->inbuf->len > 0) {
345 /* Decrypt first 16 bytes of the packet */
346 if (!SILC_IS_INBUF_PENDING(sock) && cipher)
347 silc_cipher_decrypt(cipher, sock->inbuf->data, sock->inbuf->data,
348 SILC_PACKET_MIN_HEADER_LEN, cipher->iv);
350 /* Get packet lenght and full packet length with padding */
351 SILC_PACKET_LENGTH(sock->inbuf, packetlen, paddedlen);
354 if (packetlen < SILC_PACKET_MIN_LEN) {
355 SILC_LOG_DEBUG(("Received invalid packet, dropped"));
356 silc_buffer_clear(sock->inbuf);
360 if (sock->inbuf->len < paddedlen + mac_len) {
361 SILC_LOG_DEBUG(("Received partial packet, waiting for the rest"
362 "(%d < %d)", sock->inbuf->len, paddedlen + mac_len));
363 SILC_SET_INBUF_PENDING(sock);
367 SILC_UNSET_INBUF_PENDING(sock);
368 parse_ctx = silc_calloc(1, sizeof(*parse_ctx));
369 parse_ctx->packet = silc_packet_context_alloc();
370 parse_ctx->packet->buffer = silc_buffer_alloc(paddedlen + mac_len);
371 parse_ctx->packet->padlen = sock->inbuf->data[4];
372 parse_ctx->packet->sequence = sequence++;
373 parse_ctx->sock = sock;
374 parse_ctx->context = parser_context;
376 silc_buffer_pull_tail(parse_ctx->packet->buffer,
377 SILC_BUFFER_END(parse_ctx->packet->buffer));
378 silc_buffer_put(parse_ctx->packet->buffer, sock->inbuf->data,
379 paddedlen + mac_len);
381 SILC_LOG_HEXDUMP(("Incoming packet (%d) (%d bytes decrypted), len %d",
382 sequence - 1, block_len, paddedlen + mac_len),
383 sock->inbuf->data, paddedlen + mac_len);
385 /* Check whether this is normal or special packet */
386 if (local_is_router) {
387 if (sock->inbuf->data[3] == SILC_PACKET_PRIVATE_MESSAGE &&
388 (sock->inbuf->data[2] & SILC_PACKET_FLAG_PRIVMSG_KEY))
389 parse_ctx->normal = FALSE;
390 else if (sock->inbuf->data[3] != SILC_PACKET_CHANNEL_MESSAGE ||
391 (sock->inbuf->data[3] == SILC_PACKET_CHANNEL_MESSAGE &&
392 sock->type == SILC_SOCKET_TYPE_ROUTER))
393 parse_ctx->normal = TRUE;
395 if (sock->inbuf->data[3] == SILC_PACKET_PRIVATE_MESSAGE &&
396 (sock->inbuf->data[2] & SILC_PACKET_FLAG_PRIVMSG_KEY))
397 parse_ctx->normal = FALSE;
398 else if (sock->inbuf->data[3] != SILC_PACKET_CHANNEL_MESSAGE)
399 parse_ctx->normal = TRUE;
402 /* Decrypt rest of the packet */
404 silc_packet_decrypt(cipher, hmac, parse_ctx->packet->sequence,
405 parse_ctx->packet->buffer, parse_ctx->normal);
407 /* Call the parser */
409 (*parser)(parse_ctx, parser_context);
411 /* Pull the packet from inbuf thus we'll get the next one
413 silc_buffer_pull(sock->inbuf, paddedlen + mac_len);
416 SILC_LOG_DEBUG(("Clearing inbound buffer"));
417 silc_buffer_clear(sock->inbuf);
420 /* Checks MAC in the packet. Returns TRUE if MAC is Ok. This is called
421 after packet has been totally decrypted and parsed. */
423 static int silc_packet_check_mac(SilcHmac hmac, SilcBuffer buffer,
428 unsigned char mac[32], psn[4];
431 SILC_LOG_DEBUG(("Verifying MAC"));
433 /* Compute HMAC of packet */
435 memset(mac, 0, sizeof(mac));
436 silc_hmac_init(hmac);
437 SILC_PUT32_MSB(sequence, psn);
438 silc_hmac_update(hmac, psn, 4);
439 silc_hmac_update(hmac, buffer->data, buffer->len);
440 silc_hmac_final(hmac, mac, &mac_len);
442 /* Compare the HMAC's (buffer->tail has the packet's HMAC) */
443 if (memcmp(mac, buffer->tail, mac_len)) {
444 SILC_LOG_ERROR(("MAC failed"));
448 SILC_LOG_DEBUG(("MAC is Ok"));
449 memset(mac, 0, sizeof(mac));
455 /* Decrypts rest of the packet (after decrypting just the SILC header).
456 After calling this function the packet is ready to be parsed by calling
457 silc_packet_parse. If everything goes without errors this returns TRUE,
458 if packet is malformed this returns FALSE. */
460 static int silc_packet_decrypt_rest(SilcCipher cipher, SilcHmac hmac,
465 /* Pull MAC from packet before decryption */
467 if ((buffer->len - silc_hmac_len(hmac)) > SILC_PACKET_MIN_LEN) {
468 silc_buffer_push_tail(buffer, silc_hmac_len(hmac));
470 SILC_LOG_DEBUG(("Bad MAC length in packet, packet dropped"));
475 SILC_LOG_DEBUG(("Decrypting rest of the packet"));
477 /* Decrypt rest of the packet */
478 silc_buffer_pull(buffer, SILC_PACKET_MIN_HEADER_LEN);
479 silc_cipher_decrypt(cipher, buffer->data, buffer->data, buffer->len,
481 silc_buffer_push(buffer, SILC_PACKET_MIN_HEADER_LEN);
483 SILC_LOG_HEXDUMP(("Fully decrypted packet, len %d", buffer->len),
484 buffer->data, buffer->len);
490 /* Decrypts rest of the SILC Packet header that has been decrypted partly
491 already. This decrypts the padding of the packet also. After calling
492 this function the packet is ready to be parsed by calling function
493 silc_packet_parse. This is used in special packet reception (protocol
494 defines the way of decrypting special packets). */
496 static int silc_packet_decrypt_rest_special(SilcCipher cipher,
500 /* Decrypt rest of the header plus padding */
504 /* Pull MAC from packet before decryption */
506 if ((buffer->len - silc_hmac_len(hmac)) > SILC_PACKET_MIN_LEN) {
507 silc_buffer_push_tail(buffer, silc_hmac_len(hmac));
509 SILC_LOG_DEBUG(("Bad MAC length in packet, packet dropped"));
514 SILC_LOG_DEBUG(("Decrypting rest of the header"));
516 /* padding length + src id len + dst id len + header length - 16
517 bytes already decrypted, gives the rest of the encrypted packet */
518 len = (((uint8)buffer->data[4] + (uint8)buffer->data[6] +
519 (uint8)buffer->data[7] + SILC_PACKET_HEADER_LEN) -
520 SILC_PACKET_MIN_HEADER_LEN);
522 silc_buffer_pull(buffer, SILC_PACKET_MIN_HEADER_LEN);
523 if (len > buffer->len) {
524 SILC_LOG_DEBUG(("Garbage in header of packet, bad packet length, "
528 silc_cipher_decrypt(cipher, buffer->data, buffer->data, len, cipher->iv);
529 silc_buffer_push(buffer, SILC_PACKET_MIN_HEADER_LEN);
530 SILC_LOG_HEXDUMP(("packet, len %d", buffer->len),
531 buffer->data, buffer->len);
537 /* Decrypts a packet. This assumes that typical SILC packet is the
538 packet to be decrypted and thus checks for normal and special SILC
539 packets and can handle both of them. This also computes and checks
540 the HMAC of the packet. If any other special or customized decryption
541 processing is required this function cannot be used. This returns
542 -1 on error, 0 when packet is normal packet and 1 when the packet
543 is special and requires special processing.
545 The `check_packet' is a callback funtion that this function will
546 call. The callback relates to the checking whether the packet is
547 normal packet or special packet and how it should be processed. If
548 the callback return TRUE the packet is normal and FALSE if the packet
549 is special and requires special procesing. */
551 static int silc_packet_decrypt(SilcCipher cipher, SilcHmac hmac,
552 uint32 sequence, SilcBuffer buffer,
555 /* If the packet type is not any special type lets decrypt rest
556 of the packet here. */
557 if (normal == TRUE) {
558 /* Normal packet, decrypt rest of the packet */
559 if (!silc_packet_decrypt_rest(cipher, hmac, buffer))
563 if (!silc_packet_check_mac(hmac, buffer, sequence))
568 /* Packet requires special handling, decrypt rest of the header.
569 This only decrypts. */
570 if (!silc_packet_decrypt_rest_special(cipher, hmac, buffer))
574 if (!silc_packet_check_mac(hmac, buffer, sequence))
581 /* Parses the packet. This is called when a whole packet is ready to be
582 parsed. The buffer sent must be already decrypted before calling this
583 function. The len argument must be the true length of the packet. This
584 function returns the type of the packet. The data section of the
585 buffer is parsed, not head or tail sections. */
587 SilcPacketType silc_packet_parse(SilcPacketContext *ctx, SilcCipher cipher)
589 SilcBuffer buffer = ctx->buffer;
593 SILC_LOG_DEBUG(("Parsing incoming packet"));
595 /* Check the length of the buffer */
596 if (buffer->len < SILC_PACKET_MIN_LEN) {
597 SILC_LOG_ERROR(("Bad packet length: %d, packet dropped", buffer->len));
598 return SILC_PACKET_NONE;
601 /* Parse the buffer. This parses the SILC header of the packet. */
602 len = silc_buffer_unformat(buffer,
603 SILC_STR_UI_SHORT(&ctx->truelen),
604 SILC_STR_UI_CHAR(&ctx->flags),
605 SILC_STR_UI_CHAR(&ctx->type),
606 SILC_STR_UI_CHAR(&ctx->padlen),
607 SILC_STR_UI_CHAR(&tmp),
608 SILC_STR_UI_CHAR(&ctx->src_id_len),
609 SILC_STR_UI_CHAR(&ctx->dst_id_len),
610 SILC_STR_UI_CHAR(&ctx->src_id_type),
612 if (len == -1 || tmp != 0)
613 return SILC_PACKET_NONE;
615 if (ctx->src_id_len > SILC_PACKET_MAX_ID_LEN ||
616 ctx->dst_id_len > SILC_PACKET_MAX_ID_LEN) {
617 SILC_LOG_ERROR(("Bad ID lengths in packet (%d and %d)",
618 ctx->src_id_len, ctx->dst_id_len));
619 return SILC_PACKET_NONE;
622 silc_buffer_pull(buffer, len);
623 ret = silc_buffer_unformat(buffer,
624 SILC_STR_UI_XNSTRING_ALLOC(&ctx->src_id,
626 SILC_STR_UI_CHAR(&ctx->dst_id_type),
627 SILC_STR_UI_XNSTRING_ALLOC(&ctx->dst_id,
629 SILC_STR_UI_XNSTRING(NULL, ctx->padlen),
632 return SILC_PACKET_NONE;
634 silc_buffer_push(buffer, len);
636 SILC_LOG_HEXDUMP(("parsed packet, len %d", ctx->buffer->len),
637 ctx->buffer->data, ctx->buffer->len);
639 /* Pull SILC header and padding from packet */
640 silc_buffer_pull(buffer, SILC_PACKET_HEADER_LEN +
641 ctx->src_id_len + ctx->dst_id_len + ctx->padlen);
643 SILC_LOG_DEBUG(("Incoming packet type: %d", ctx->type));
648 /* Perform special SILC Packet header parsing. This is required to some
649 packet types that have the data payload encrypted with different key
650 than the header area plus padding of the packet. Hence, this parses
651 the header in a way that it does not take the data area into account
652 and parses the header and padding area only. */
654 SilcPacketType silc_packet_parse_special(SilcPacketContext *ctx,
657 SilcBuffer buffer = ctx->buffer;
661 SILC_LOG_DEBUG(("Parsing incoming packet"));
663 /* Check the length of the buffer */
664 if (buffer->len < SILC_PACKET_MIN_LEN) {
665 SILC_LOG_ERROR(("Bad packet length: %d, packet dropped", buffer->len));
666 return SILC_PACKET_NONE;
669 /* Parse the buffer. This parses the SILC header of the packet. */
670 len = silc_buffer_unformat(buffer,
671 SILC_STR_UI_SHORT(&ctx->truelen),
672 SILC_STR_UI_CHAR(&ctx->flags),
673 SILC_STR_UI_CHAR(&ctx->type),
674 SILC_STR_UI_CHAR(&ctx->padlen),
675 SILC_STR_UI_CHAR(&tmp),
676 SILC_STR_UI_CHAR(&ctx->src_id_len),
677 SILC_STR_UI_CHAR(&ctx->dst_id_len),
678 SILC_STR_UI_CHAR(&ctx->src_id_type),
680 if (len == -1 || tmp != 0) {
681 SILC_LOG_ERROR(("Malformed packet header, packet dropped"));
682 return SILC_PACKET_NONE;
685 if (ctx->src_id_len > SILC_PACKET_MAX_ID_LEN ||
686 ctx->dst_id_len > SILC_PACKET_MAX_ID_LEN) {
687 SILC_LOG_ERROR(("Bad ID lengths in packet (%d and %d)",
688 ctx->src_id_len, ctx->dst_id_len));
689 return SILC_PACKET_NONE;
692 silc_buffer_pull(buffer, len);
693 ret = silc_buffer_unformat(buffer,
694 SILC_STR_UI_XNSTRING_ALLOC(&ctx->src_id,
696 SILC_STR_UI_CHAR(&ctx->dst_id_type),
697 SILC_STR_UI_XNSTRING_ALLOC(&ctx->dst_id,
699 SILC_STR_UI_XNSTRING(NULL, ctx->padlen),
702 SILC_LOG_ERROR(("Malformed packet header, packet dropped"));
703 return SILC_PACKET_NONE;
706 silc_buffer_push(buffer, len);
708 SILC_LOG_HEXDUMP(("parsed packet, len %d", ctx->buffer->len),
709 ctx->buffer->data, ctx->buffer->len);
711 /* Pull SILC header and padding from packet */
712 silc_buffer_pull(buffer, SILC_PACKET_HEADER_LEN +
713 ctx->src_id_len + ctx->dst_id_len + ctx->padlen);
715 SILC_LOG_DEBUG(("Incoming packet type: %d", ctx->type));
720 /* Allocate packet context */
722 SilcPacketContext *silc_packet_context_alloc(void)
724 SilcPacketContext *ctx = silc_calloc(1, sizeof(*ctx));
729 /* Increse the reference count of the packet context. */
731 SilcPacketContext *silc_packet_context_dup(SilcPacketContext *ctx)
734 SILC_LOG_DEBUG(("Packet context %p refcnt %d->%d", ctx, ctx->users - 1,
739 /* Decrese the reference count of the packet context and free it only if
742 void silc_packet_context_free(SilcPacketContext *ctx)
745 SILC_LOG_DEBUG(("Packet context %p refcnt %d->%d", ctx, ctx->users + 1,
750 silc_buffer_free(ctx->buffer);
752 silc_free(ctx->src_id);
754 silc_free(ctx->dst_id);