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: %s",
65 SILC_LOG_DEBUG(("Could not force the send, packet put to queue"));
68 SILC_LOG_DEBUG(("Packet in queue"));
73 /* Encrypts a packet. This also creates HMAC of the packet before
74 encryption and adds the HMAC at the end of the buffer. This assumes
75 that there is enough free space at the end of the buffer to add the
76 computed HMAC. This is the normal way of encrypting packets, if some
77 other process of HMAC computing and encryption is needed this function
80 void silc_packet_encrypt(SilcCipher cipher, SilcHmac hmac, SilcUInt32 sequence,
81 SilcBuffer buffer, SilcUInt32 len)
84 /* Encrypt the data area of the packet. */
86 SILC_LOG_DEBUG(("Encrypting packet (%d), cipher %s, len %d",
87 sequence, silc_cipher_get_name(cipher), len));
88 silc_cipher_encrypt(cipher, buffer->data, buffer->data, len, NULL);
91 /* Compute HMAC. This assumes that MAC is computed from the entire
92 data area thus this uses the length found in buffer, not the length
95 unsigned char mac[32], psn[4];
99 SILC_PUT32_MSB(sequence, psn);
100 silc_hmac_update(hmac, psn, 4);
101 silc_hmac_update(hmac, buffer->data, buffer->len);
102 silc_hmac_final(hmac, mac, &mac_len);
104 /* Put MAC and pull the it into the visible data area in the buffer */
105 silc_buffer_put_tail(buffer, mac, mac_len);
106 silc_buffer_pull_tail(buffer, mac_len);
110 /* Assembles a new packet to be ready for send out. */
112 bool silc_packet_assemble(SilcPacketContext *packet, SilcRng rng,
113 SilcCipher cipher, SilcHmac hmac,
114 SilcSocketConnection sock,
115 const unsigned char *data, SilcUInt32 data_len,
116 const SilcBuffer assembled_packet)
118 unsigned char tmppad[SILC_PACKET_MAX_PADLEN];
119 unsigned int block_len = cipher ? silc_cipher_get_block_len(cipher) : 0;
122 SILC_LOG_DEBUG(("Assembling outgoing packet"));
124 /* Calculate the packet's length and padding length if upper layer
125 didn't already do it. */
127 /* Get the true length of the packet. This is saved as payload length
128 into the packet header. This does not include the length of the
130 if (!packet->truelen) {
131 data_len = SILC_PACKET_DATALEN(data_len, SILC_PACKET_HEADER_LEN +
132 packet->src_id_len + packet->dst_id_len);
133 packet->truelen = data_len + SILC_PACKET_HEADER_LEN +
134 packet->src_id_len + packet->dst_id_len;
137 /* Calculate the length of the padding. The padding is calculated from
138 the data that will be encrypted. */
139 if (!packet->padlen) {
140 if (packet->long_pad)
141 SILC_PACKET_PADLEN_MAX(packet->truelen, block_len, packet->padlen);
143 SILC_PACKET_PADLEN(packet->truelen, block_len, packet->padlen);
146 /* Now prepare the outgoing data buffer for packet sending and start
147 assembling the packet. */
149 /* Return pointer to the assembled packet */
150 if (!silc_packet_send_prepare(sock, packet->truelen - data_len,
151 packet->padlen, data_len, hmac,
155 /* Get random padding */
157 for (i = 0; i < packet->padlen; i++) tmppad[i] =
158 silc_rng_get_byte_fast(rng);
160 for (i = 0; i < packet->padlen; i++) tmppad[i] =
161 silc_rng_global_get_byte_fast();
163 /* Create the packet. This creates the SILC header, adds padding, and
164 the actual packet data. */
166 silc_buffer_format(assembled_packet,
167 SILC_STR_UI_SHORT(packet->truelen),
168 SILC_STR_UI_CHAR(packet->flags),
169 SILC_STR_UI_CHAR(packet->type),
170 SILC_STR_UI_CHAR(packet->padlen),
172 SILC_STR_UI_CHAR(packet->src_id_len),
173 SILC_STR_UI_CHAR(packet->dst_id_len),
174 SILC_STR_UI_CHAR(packet->src_id_type),
175 SILC_STR_UI_XNSTRING(packet->src_id,
177 SILC_STR_UI_CHAR(packet->dst_id_type),
178 SILC_STR_UI_XNSTRING(packet->dst_id,
180 SILC_STR_UI_XNSTRING(tmppad, packet->padlen),
181 SILC_STR_UI_XNSTRING(data, data_len),
186 SILC_LOG_HEXDUMP(("Assembled packet, len %d", assembled_packet->len),
187 assembled_packet->data, assembled_packet->len);
192 /* Prepare outgoing data buffer for packet sending. This moves the data
193 area so that new packet may be added into it. If needed this allocates
194 more space to the buffer. This handles directly the connection's
195 outgoing buffer in SilcSocketConnection object, and returns the
196 pointer to that buffer into the `packet'. */
198 bool silc_packet_send_prepare(SilcSocketConnection sock,
199 SilcUInt32 header_len,
203 const SilcBuffer packet)
206 unsigned char *oldptr;
207 unsigned int mac_len = hmac ? silc_hmac_len(hmac) : 0;
212 totlen = header_len + pad_len + data_len;
214 /* Prepare the outgoing buffer for packet sending. */
216 /* Allocate new buffer. This is done only once per connection. */
217 SILC_LOG_DEBUG(("Allocating outgoing data buffer"));
219 sock->outbuf = silc_buffer_alloc(totlen > SILC_PACKET_DEFAULT_SIZE ?
220 totlen : SILC_PACKET_DEFAULT_SIZE);
224 if (!SILC_IS_OUTBUF_PENDING(sock)) {
225 /* Buffer is free for use */
226 silc_buffer_clear(sock->outbuf);
230 /* Allocate more space if needed */
231 if ((sock->outbuf->end - sock->outbuf->tail) < (totlen + mac_len)) {
232 SILC_LOG_DEBUG(("Reallocating outgoing data buffer"));
233 sock->outbuf = silc_buffer_realloc(sock->outbuf,
234 sock->outbuf->truelen + (totlen * 2));
239 /* Pull data area for the new packet, and return pointer to the start of
240 the data area and save the pointer in to the `packet'. */
241 oldptr = silc_buffer_pull_tail(sock->outbuf, totlen + mac_len);
242 silc_buffer_set(packet, oldptr, totlen + mac_len);
243 silc_buffer_push_tail(packet, mac_len);
248 /******************************************************************************
250 Packet Reception Routines
252 ******************************************************************************/
254 static int silc_packet_decrypt(SilcCipher cipher, SilcHmac hmac,
255 SilcUInt32 sequence, SilcBuffer buffer,
257 static bool silc_packet_check_mac(SilcHmac hmac,
258 const unsigned char *data,
260 const unsigned char *packet_mac,
261 SilcUInt32 sequence);
263 /* Receives packet from network and reads the data into connection's
264 incoming data buffer. If the data was read directly this returns the
265 read bytes, if error occured this returns -1, if the data could not
266 be read directly at this time this returns -2 in which case the data
267 should be read again at some later time, or If EOF occured this returns
270 int silc_packet_receive(SilcSocketConnection sock)
274 SILC_LOG_DEBUG(("Receiving packet from %s:%d [%s]", sock->hostname,
276 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
277 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
278 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
281 /* Read some data from connection */
282 ret = silc_socket_read(sock);
287 /* Processes and decrypts the incmoing data, and calls parser callback
288 for each received packet that will handle the actual packet parsing.
289 If more than one packet was received this calls the parser multiple
290 times. The parser callback will get context SilcPacketParserContext
291 that includes the packet and the `parser_context' sent to this
294 The `local_is_router' indicates whether the caller is router server
295 in which case the receiving process of a certain packet types may
296 be special. Normal server and client must set it to FALSE. The
297 SilcPacketParserContext will indicate also whether the received
298 packet was normal or special packet. */
300 bool silc_packet_receive_process(SilcSocketConnection sock,
301 bool local_is_router,
302 SilcCipher cipher, SilcHmac hmac,
304 SilcPacketParserCallback parser,
305 void *parser_context)
307 SilcPacketParserContext *parse_ctx;
308 SilcUInt16 packetlen;
309 SilcUInt32 paddedlen, mac_len = 0, block_len;
312 unsigned char tmp[SILC_PACKET_MIN_HEADER_LEN], *header;
313 unsigned char iv[SILC_CIPHER_MAX_IV_SIZE];
315 /* Do not process for disconnected connection */
316 if (SILC_IS_DISCONNECTED(sock))
319 if (sock->inbuf->len < SILC_PACKET_MIN_HEADER_LEN)
323 mac_len = silc_hmac_len(hmac);
325 /* Parse the packets from the data */
326 while (sock->inbuf->len > 0 && cont) {
328 if (sock->inbuf->len < SILC_PACKET_MIN_HEADER_LEN) {
329 SILC_LOG_DEBUG(("Partial packet in queue, waiting for the rest"));
333 /* Decrypt first block of the packet to get the length field out */
335 block_len = silc_cipher_get_block_len(cipher);
336 memcpy(iv, silc_cipher_get_iv(cipher), block_len);
337 silc_cipher_decrypt(cipher, sock->inbuf->data, tmp, block_len, iv);
340 block_len = SILC_PACKET_MIN_HEADER_LEN;
341 header = sock->inbuf->data;
344 /* Get packet lenght and full packet length with padding */
345 SILC_PACKET_LENGTH(header, packetlen, paddedlen);
348 if (packetlen < SILC_PACKET_MIN_LEN) {
349 SILC_LOG_ERROR(("Received too short packet"));
350 memset(header, 0, sizeof(header));
351 silc_buffer_clear(sock->inbuf);
355 if (sock->inbuf->len < paddedlen + mac_len) {
356 SILC_LOG_DEBUG(("Received partial packet, waiting for the rest "
357 "(%d bytes)", paddedlen + mac_len - sock->inbuf->len));
358 SILC_SET_INBUF_PENDING(sock);
359 memset(tmp, 0, sizeof(tmp));
363 /* Check MAC of the packet */
364 if (!silc_packet_check_mac(hmac, sock->inbuf->data, paddedlen,
365 sock->inbuf->data + paddedlen, sequence)) {
366 SILC_LOG_WARNING(("Packet MAC check failed %s:%d "
367 "[%s type %d len %dB seq %d] [%s]",
368 sock->hostname, sock->port,
369 silc_get_packet_name(header[3]),
370 header[3], paddedlen, sequence,
371 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
372 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
373 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
375 memset(tmp, 0, sizeof(tmp));
376 silc_buffer_clear(sock->inbuf);
380 SILC_UNSET_INBUF_PENDING(sock);
381 parse_ctx = silc_calloc(1, sizeof(*parse_ctx));
384 parse_ctx->packet = silc_packet_context_alloc();
385 parse_ctx->packet->buffer = silc_buffer_alloc_size(paddedlen);
386 parse_ctx->packet->type = (SilcPacketType)header[3];
387 parse_ctx->packet->padlen = (SilcUInt8)header[4];
388 parse_ctx->packet->sequence = sequence++;
389 parse_ctx->sock = sock;
390 parse_ctx->context = parser_context;
392 /* Check whether this is normal or special packet */
393 if (local_is_router) {
394 if (header[3] == SILC_PACKET_PRIVATE_MESSAGE &&
395 (header[2] & SILC_PACKET_FLAG_PRIVMSG_KEY))
396 parse_ctx->normal = FALSE;
397 else if (header[3] != SILC_PACKET_CHANNEL_MESSAGE ||
398 (header[3] == SILC_PACKET_CHANNEL_MESSAGE &&
399 sock->type == SILC_SOCKET_TYPE_ROUTER))
400 parse_ctx->normal = TRUE;
402 if (header[3] == SILC_PACKET_PRIVATE_MESSAGE &&
403 (header[2] & SILC_PACKET_FLAG_PRIVMSG_KEY))
404 parse_ctx->normal = FALSE;
405 else if (header[3] != SILC_PACKET_CHANNEL_MESSAGE)
406 parse_ctx->normal = TRUE;
409 SILC_LOG_HEXDUMP(("Incoming packet (%d) len %d",
410 sequence - 1, paddedlen + mac_len),
411 sock->inbuf->data, paddedlen + mac_len);
413 /* Put the decrypted part, and rest of the encrypted data, and decrypt */
414 silc_buffer_put(parse_ctx->packet->buffer, header, block_len);
415 silc_buffer_pull(parse_ctx->packet->buffer, block_len);
416 silc_buffer_put(parse_ctx->packet->buffer, sock->inbuf->data + block_len,
417 paddedlen - block_len);
419 silc_cipher_set_iv(cipher, iv);
420 ret = silc_packet_decrypt(cipher, hmac, parse_ctx->packet->sequence,
421 parse_ctx->packet->buffer,
424 SILC_LOG_WARNING(("Packet decryption failed %s:%d [%s] [%s]",
425 sock->hostname, sock->port,
426 silc_get_packet_name(parse_ctx->packet->type),
427 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
428 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
429 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
431 memset(tmp, 0, sizeof(tmp));
432 silc_packet_context_free(parse_ctx->packet);
433 silc_free(parse_ctx);
437 silc_buffer_push(parse_ctx->packet->buffer, block_len);
439 SILC_LOG_HEXDUMP(("Fully decrypted packet, len %d",
440 parse_ctx->packet->buffer->len),
441 parse_ctx->packet->buffer->data,
442 parse_ctx->packet->buffer->len);
444 /* Pull the packet from inbuf thus we'll get the next one
446 silc_buffer_pull(sock->inbuf, paddedlen + mac_len);
448 /* Call the parser */
449 cont = (*parser)(parse_ctx, parser_context);
450 memset(tmp, 0, sizeof(tmp));
453 if (cont == FALSE && sock->inbuf->len > 0)
456 SILC_LOG_DEBUG(("Clearing inbound buffer"));
457 silc_buffer_clear(sock->inbuf);
461 /* Checks MAC in the packet. Returns TRUE if MAC is Ok. */
463 static bool silc_packet_check_mac(SilcHmac hmac,
464 const unsigned char *data,
466 const unsigned char *packet_mac,
471 unsigned char mac[32], psn[4];
474 SILC_LOG_DEBUG(("Verifying MAC"));
476 /* Compute HMAC of packet */
477 silc_hmac_init(hmac);
478 SILC_PUT32_MSB(sequence, psn);
479 silc_hmac_update(hmac, psn, 4);
480 silc_hmac_update(hmac, data, data_len);
481 silc_hmac_final(hmac, mac, &mac_len);
483 /* Compare the MAC's */
484 if (memcmp(packet_mac, mac, mac_len)) {
485 SILC_LOG_ERROR(("MAC failed"));
489 SILC_LOG_DEBUG(("MAC is Ok"));
495 /* Decrypts SILC packet. Handles both normal and special packet decryption.
496 Return 0 when packet is normal and 1 when it it special, -1 on error. */
498 static int silc_packet_decrypt(SilcCipher cipher, SilcHmac hmac,
499 SilcUInt32 sequence, SilcBuffer buffer,
502 /* If the packet type is not any special type lets decrypt rest
503 of the packet here. */
504 if (normal == TRUE) {
506 /* Decrypt rest of the packet */
507 SILC_LOG_DEBUG(("Decrypting the packet"));
508 if (!silc_cipher_decrypt(cipher, buffer->data, buffer->data,
509 buffer->len, NULL)) {
510 SILC_LOG_ERROR(("silc_cipher_decrypt failed"));
517 /* Decrypt rest of the header plus padding */
520 SilcUInt32 block_len = silc_cipher_get_block_len(cipher);
522 SILC_LOG_DEBUG(("Decrypting the header"));
524 /* padding length + src id len + dst id len + header length - 16
525 bytes already decrypted, gives the rest of the encrypted packet */
526 silc_buffer_push(buffer, block_len);
527 len = (((SilcUInt8)buffer->data[4] + (SilcUInt8)buffer->data[6] +
528 (SilcUInt8)buffer->data[7] + SILC_PACKET_HEADER_LEN) -
531 if (len > buffer->len) {
532 SILC_LOG_ERROR(("Garbage in header of packet, bad packet length, "
536 silc_buffer_pull(buffer, block_len);
537 if (!silc_cipher_decrypt(cipher, buffer->data, buffer->data,
539 SILC_LOG_ERROR(("silc_cipher_decrypt failed"));
548 /* Parses the packet. This is called when a whole packet is ready to be
549 parsed. The buffer sent must be already decrypted before calling this
550 function. The len argument must be the true length of the packet. This
551 function returns the type of the packet. The data section of the
552 buffer is parsed, not head or tail sections. */
554 SilcPacketType silc_packet_parse(SilcPacketContext *ctx, SilcCipher cipher)
556 SilcBuffer buffer = ctx->buffer;
559 SilcUInt8 src_id_len, src_id_type, dst_id_len, dst_id_type, padlen;
561 SILC_LOG_DEBUG(("Parsing incoming packet"));
563 /* Check the length of the buffer */
564 if (buffer->len < SILC_PACKET_MIN_LEN) {
565 SILC_LOG_ERROR(("Bad packet length: %d, packet dropped", buffer->len));
566 return SILC_PACKET_NONE;
569 /* Parse the buffer. This parses the SILC header of the packet. */
570 len = silc_buffer_unformat(buffer,
571 SILC_STR_UI_SHORT(&ctx->truelen),
572 SILC_STR_UI_CHAR(&ctx->flags),
573 SILC_STR_UI_CHAR(&ctx->type),
574 SILC_STR_UI_CHAR(&padlen),
575 SILC_STR_UI_CHAR(&tmp),
576 SILC_STR_UI_CHAR(&src_id_len),
577 SILC_STR_UI_CHAR(&dst_id_len),
578 SILC_STR_UI_CHAR(&src_id_type),
580 if (len == -1 || tmp != 0)
581 return SILC_PACKET_NONE;
583 if (src_id_len > SILC_PACKET_MAX_ID_LEN ||
584 dst_id_len > SILC_PACKET_MAX_ID_LEN) {
585 SILC_LOG_ERROR(("Bad ID lengths in packet (%d and %d)",
586 src_id_len, dst_id_len));
587 return SILC_PACKET_NONE;
590 silc_buffer_pull(buffer, len);
591 ret = silc_buffer_unformat(buffer,
592 SILC_STR_UI_XNSTRING_ALLOC(&ctx->src_id,
594 SILC_STR_UI_CHAR(&dst_id_type),
595 SILC_STR_UI_XNSTRING_ALLOC(&ctx->dst_id,
597 SILC_STR_UI_XNSTRING(NULL, padlen),
600 return SILC_PACKET_NONE;
602 if (src_id_type > SILC_ID_CHANNEL || dst_id_type > SILC_ID_CHANNEL) {
603 SILC_LOG_ERROR(("Bad ID types in packet (%d and %d)",
604 src_id_type, dst_id_type));
605 return SILC_PACKET_NONE;
608 ctx->src_id_len = src_id_len;
609 ctx->dst_id_len = dst_id_len;
610 ctx->src_id_type = src_id_type;
611 ctx->dst_id_type = dst_id_type;
612 ctx->padlen = padlen;
614 silc_buffer_push(buffer, len);
616 SILC_LOG_HEXDUMP(("parsed packet, len %d", ctx->buffer->len),
617 ctx->buffer->data, ctx->buffer->len);
619 /* Pull SILC header and padding from packet */
620 silc_buffer_pull(buffer, SILC_PACKET_HEADER_LEN +
621 ctx->src_id_len + ctx->dst_id_len + ctx->padlen);
623 SILC_LOG_DEBUG(("Incoming packet type: %d", ctx->type));
628 /* Perform special SILC Packet header parsing. This is required to some
629 packet types that have the data payload encrypted with different key
630 than the header area plus padding of the packet. Hence, this parses
631 the header in a way that it does not take the data area into account
632 and parses the header and padding area only. */
634 SilcPacketType silc_packet_parse_special(SilcPacketContext *ctx,
637 SilcBuffer buffer = ctx->buffer;
640 SilcUInt8 src_id_len, src_id_type, dst_id_len, dst_id_type, padlen;
642 SILC_LOG_DEBUG(("Parsing incoming packet"));
644 /* Check the length of the buffer */
645 if (buffer->len < SILC_PACKET_MIN_LEN) {
646 SILC_LOG_ERROR(("Bad packet length: %d, packet dropped", buffer->len));
647 return SILC_PACKET_NONE;
650 /* Parse the buffer. This parses the SILC header of the packet. */
651 len = silc_buffer_unformat(buffer,
652 SILC_STR_UI_SHORT(&ctx->truelen),
653 SILC_STR_UI_CHAR(&ctx->flags),
654 SILC_STR_UI_CHAR(&ctx->type),
655 SILC_STR_UI_CHAR(&padlen),
656 SILC_STR_UI_CHAR(&tmp),
657 SILC_STR_UI_CHAR(&src_id_len),
658 SILC_STR_UI_CHAR(&dst_id_len),
659 SILC_STR_UI_CHAR(&src_id_type),
661 if (len == -1 || tmp != 0) {
662 SILC_LOG_ERROR(("Malformed packet header, packet dropped"));
663 return SILC_PACKET_NONE;
666 if (src_id_len > SILC_PACKET_MAX_ID_LEN ||
667 dst_id_len > SILC_PACKET_MAX_ID_LEN) {
668 SILC_LOG_ERROR(("Bad ID lengths in packet (%d and %d)",
669 src_id_len, dst_id_len));
670 return SILC_PACKET_NONE;
673 silc_buffer_pull(buffer, len);
674 ret = silc_buffer_unformat(buffer,
675 SILC_STR_UI_XNSTRING_ALLOC(&ctx->src_id,
677 SILC_STR_UI_CHAR(&dst_id_type),
678 SILC_STR_UI_XNSTRING_ALLOC(&ctx->dst_id,
680 SILC_STR_UI_XNSTRING(NULL, padlen),
683 SILC_LOG_ERROR(("Malformed packet header, packet dropped"));
684 return SILC_PACKET_NONE;
687 if (src_id_type > SILC_ID_CHANNEL || dst_id_type > SILC_ID_CHANNEL) {
688 SILC_LOG_ERROR(("Bad ID types in packet (%d and %d)",
689 src_id_type, dst_id_type));
690 return SILC_PACKET_NONE;
693 ctx->src_id_len = src_id_len;
694 ctx->dst_id_len = dst_id_len;
695 ctx->src_id_type = src_id_type;
696 ctx->dst_id_type = dst_id_type;
697 ctx->padlen = padlen;
699 silc_buffer_push(buffer, len);
701 SILC_LOG_HEXDUMP(("parsed packet, len %d", ctx->buffer->len),
702 ctx->buffer->data, ctx->buffer->len);
704 /* Pull SILC header and padding from packet */
705 silc_buffer_pull(buffer, SILC_PACKET_HEADER_LEN +
706 ctx->src_id_len + ctx->dst_id_len + ctx->padlen);
708 SILC_LOG_DEBUG(("Incoming packet type: %d", ctx->type));
713 /* Allocate packet context */
715 SilcPacketContext *silc_packet_context_alloc(void)
717 SilcPacketContext *ctx = silc_calloc(1, sizeof(*ctx));
724 /* Increse the reference count of the packet context. */
726 SilcPacketContext *silc_packet_context_dup(SilcPacketContext *ctx)
729 SILC_LOG_DEBUG(("Packet context %p refcnt %d->%d", ctx, ctx->users - 1,
734 /* Decrese the reference count of the packet context and free it only if
737 void silc_packet_context_free(SilcPacketContext *ctx)
740 SILC_LOG_DEBUG(("Packet context %p refcnt %d->%d", ctx, ctx->users + 1,
745 silc_buffer_free(ctx->buffer);
747 silc_free(ctx->src_id);
749 silc_free(ctx->dst_id);