5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2003 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_DISCONNECTING(sock) || 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 blen %dB seq %d] [%s] proto %d",
368 sock->hostname, sock->port,
369 silc_get_packet_name(header[3]),
370 header[3], paddedlen, sock->inbuf->len, 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 sock->protocol ? sock->protocol->protocol->type : -1));
376 memset(tmp, 0, sizeof(tmp));
377 silc_buffer_clear(sock->inbuf);
381 SILC_UNSET_INBUF_PENDING(sock);
382 parse_ctx = silc_calloc(1, sizeof(*parse_ctx));
385 parse_ctx->packet = silc_packet_context_alloc();
386 parse_ctx->packet->buffer = silc_buffer_alloc_size(paddedlen);
387 parse_ctx->packet->type = (SilcPacketType)header[3];
388 parse_ctx->packet->padlen = (SilcUInt8)header[4];
389 parse_ctx->packet->sequence = sequence++;
390 parse_ctx->sock = silc_socket_dup(sock);
391 parse_ctx->context = parser_context;
393 /* Check whether this is normal or special packet */
394 if (local_is_router) {
395 if (header[3] == SILC_PACKET_PRIVATE_MESSAGE &&
396 (header[2] & SILC_PACKET_FLAG_PRIVMSG_KEY))
397 parse_ctx->normal = FALSE;
398 else if (header[3] != SILC_PACKET_CHANNEL_MESSAGE ||
399 (header[3] == SILC_PACKET_CHANNEL_MESSAGE &&
400 sock->type == SILC_SOCKET_TYPE_ROUTER))
401 parse_ctx->normal = TRUE;
403 if (header[3] == SILC_PACKET_PRIVATE_MESSAGE &&
404 (header[2] & SILC_PACKET_FLAG_PRIVMSG_KEY))
405 parse_ctx->normal = FALSE;
406 else if (header[3] != SILC_PACKET_CHANNEL_MESSAGE)
407 parse_ctx->normal = TRUE;
410 SILC_LOG_HEXDUMP(("Incoming packet (%d) len %d",
411 sequence - 1, paddedlen + mac_len),
412 sock->inbuf->data, paddedlen + mac_len);
414 /* Put the decrypted part, and rest of the encrypted data, and decrypt */
415 silc_buffer_put(parse_ctx->packet->buffer, header, block_len);
416 silc_buffer_pull(parse_ctx->packet->buffer, block_len);
417 silc_buffer_put(parse_ctx->packet->buffer, sock->inbuf->data + block_len,
418 paddedlen - block_len);
420 silc_cipher_set_iv(cipher, iv);
421 ret = silc_packet_decrypt(cipher, hmac, parse_ctx->packet->sequence,
422 parse_ctx->packet->buffer,
425 SILC_LOG_WARNING(("Packet decryption failed %s:%d [%s] [%s]",
426 sock->hostname, sock->port,
427 silc_get_packet_name(parse_ctx->packet->type),
428 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
429 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
430 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
432 memset(tmp, 0, sizeof(tmp));
433 silc_packet_context_free(parse_ctx->packet);
434 silc_free(parse_ctx);
438 silc_buffer_push(parse_ctx->packet->buffer, block_len);
440 SILC_LOG_HEXDUMP(("Fully decrypted packet, len %d",
441 parse_ctx->packet->buffer->len),
442 parse_ctx->packet->buffer->data,
443 parse_ctx->packet->buffer->len);
445 /* Pull the packet from inbuf thus we'll get the next one
447 silc_buffer_pull(sock->inbuf, paddedlen + mac_len);
449 /* Call the parser */
450 cont = (*parser)(parse_ctx, parser_context);
452 /* See if socket disconnected while parsing the packet */
453 if (SILC_IS_DISCONNECTING(sock) || SILC_IS_DISCONNECTED(sock)) {
454 SILC_LOG_DEBUG(("Abandoning packet processing, socket disconnected"));
458 memset(tmp, 0, sizeof(tmp));
461 /* Don't clear buffer if pending data is in the buffer */
462 if (cont == FALSE && sock->inbuf->len > 0)
465 /* Don't clear buffer if QoS data exists in the buffer */
466 if (sock->qos && sock->qos->data_len > 0)
469 SILC_LOG_DEBUG(("Clearing inbound buffer"));
470 silc_buffer_clear(sock->inbuf);
474 /* Checks MAC in the packet. Returns TRUE if MAC is Ok. */
476 static bool silc_packet_check_mac(SilcHmac hmac,
477 const unsigned char *data,
479 const unsigned char *packet_mac,
484 unsigned char mac[32], psn[4];
487 SILC_LOG_DEBUG(("Verifying MAC"));
489 /* Compute HMAC of packet */
490 silc_hmac_init(hmac);
491 SILC_PUT32_MSB(sequence, psn);
492 silc_hmac_update(hmac, psn, 4);
493 silc_hmac_update(hmac, data, data_len);
494 silc_hmac_final(hmac, mac, &mac_len);
496 /* Compare the MAC's */
497 if (memcmp(packet_mac, mac, mac_len)) {
498 SILC_LOG_ERROR(("MAC failed"));
502 SILC_LOG_DEBUG(("MAC is Ok"));
508 /* Decrypts SILC packet. Handles both normal and special packet decryption.
509 Return 0 when packet is normal and 1 when it it special, -1 on error. */
511 static int silc_packet_decrypt(SilcCipher cipher, SilcHmac hmac,
512 SilcUInt32 sequence, SilcBuffer buffer,
515 /* If the packet type is not any special type lets decrypt rest
516 of the packet here. */
517 if (normal == TRUE) {
519 /* Decrypt rest of the packet */
520 SILC_LOG_DEBUG(("Decrypting the packet"));
521 if (!silc_cipher_decrypt(cipher, buffer->data, buffer->data,
522 buffer->len, NULL)) {
523 SILC_LOG_ERROR(("silc_cipher_decrypt failed"));
530 /* Decrypt rest of the header plus padding */
533 SilcUInt32 block_len = silc_cipher_get_block_len(cipher);
535 SILC_LOG_DEBUG(("Decrypting the header"));
537 /* padding length + src id len + dst id len + header length - 16
538 bytes already decrypted, gives the rest of the encrypted packet */
539 silc_buffer_push(buffer, block_len);
540 len = (((SilcUInt8)buffer->data[4] + (SilcUInt8)buffer->data[6] +
541 (SilcUInt8)buffer->data[7] + SILC_PACKET_HEADER_LEN) -
543 silc_buffer_pull(buffer, block_len);
545 if (len > buffer->len) {
546 SILC_LOG_ERROR(("Garbage in header of packet, bad packet length, "
550 if (!silc_cipher_decrypt(cipher, buffer->data, buffer->data,
552 SILC_LOG_ERROR(("silc_cipher_decrypt failed"));
561 /* Parses the packet. This is called when a whole packet is ready to be
562 parsed. The buffer sent must be already decrypted before calling this
563 function. The len argument must be the true length of the packet. This
564 function returns the type of the packet. The data section of the
565 buffer is parsed, not head or tail sections. */
567 SilcPacketType silc_packet_parse(SilcPacketContext *ctx, SilcCipher cipher)
569 SilcBuffer buffer = ctx->buffer;
572 SilcUInt8 src_id_len, src_id_type, dst_id_len, dst_id_type, padlen;
574 SILC_LOG_DEBUG(("Parsing incoming packet"));
576 /* Check the length of the buffer */
577 if (buffer->len < SILC_PACKET_MIN_LEN) {
578 SILC_LOG_ERROR(("Bad packet length: %d, packet dropped", buffer->len));
579 return SILC_PACKET_NONE;
582 /* Parse the buffer. This parses the SILC header of the packet. */
583 len = silc_buffer_unformat(buffer,
584 SILC_STR_UI_SHORT(&ctx->truelen),
585 SILC_STR_UI_CHAR(&ctx->flags),
586 SILC_STR_UI_CHAR(&ctx->type),
587 SILC_STR_UI_CHAR(&padlen),
588 SILC_STR_UI_CHAR(&tmp),
589 SILC_STR_UI_CHAR(&src_id_len),
590 SILC_STR_UI_CHAR(&dst_id_len),
591 SILC_STR_UI_CHAR(&src_id_type),
593 if (len == -1 || tmp != 0)
594 return SILC_PACKET_NONE;
596 if (src_id_len > SILC_PACKET_MAX_ID_LEN ||
597 dst_id_len > SILC_PACKET_MAX_ID_LEN) {
598 SILC_LOG_ERROR(("Bad ID lengths in packet (%d and %d)",
599 src_id_len, dst_id_len));
600 return SILC_PACKET_NONE;
603 silc_buffer_pull(buffer, len);
604 ret = silc_buffer_unformat(buffer,
605 SILC_STR_UI_XNSTRING_ALLOC(&ctx->src_id,
607 SILC_STR_UI_CHAR(&dst_id_type),
608 SILC_STR_UI_XNSTRING_ALLOC(&ctx->dst_id,
610 SILC_STR_UI_XNSTRING(NULL, padlen),
613 return SILC_PACKET_NONE;
615 if (src_id_type > SILC_ID_CHANNEL || dst_id_type > SILC_ID_CHANNEL) {
616 SILC_LOG_ERROR(("Bad ID types in packet (%d and %d)",
617 src_id_type, dst_id_type));
618 return SILC_PACKET_NONE;
621 ctx->src_id_len = src_id_len;
622 ctx->dst_id_len = dst_id_len;
623 ctx->src_id_type = src_id_type;
624 ctx->dst_id_type = dst_id_type;
625 ctx->padlen = padlen;
627 silc_buffer_push(buffer, len);
629 SILC_LOG_HEXDUMP(("parsed packet, len %d", ctx->buffer->len),
630 ctx->buffer->data, ctx->buffer->len);
632 /* Pull SILC header and padding from packet */
633 silc_buffer_pull(buffer, SILC_PACKET_HEADER_LEN +
634 ctx->src_id_len + ctx->dst_id_len + ctx->padlen);
636 SILC_LOG_DEBUG(("Incoming packet type: %d", ctx->type));
641 /* Perform special SILC Packet header parsing. This is required to some
642 packet types that have the data payload encrypted with different key
643 than the header area plus padding of the packet. Hence, this parses
644 the header in a way that it does not take the data area into account
645 and parses the header and padding area only. */
647 SilcPacketType silc_packet_parse_special(SilcPacketContext *ctx,
650 SilcBuffer buffer = ctx->buffer;
653 SilcUInt8 src_id_len, src_id_type, dst_id_len, dst_id_type, padlen;
655 SILC_LOG_DEBUG(("Parsing incoming packet"));
657 /* Check the length of the buffer */
658 if (buffer->len < SILC_PACKET_MIN_LEN) {
659 SILC_LOG_ERROR(("Bad packet length: %d, packet dropped", buffer->len));
660 return SILC_PACKET_NONE;
663 /* Parse the buffer. This parses the SILC header of the packet. */
664 len = silc_buffer_unformat(buffer,
665 SILC_STR_UI_SHORT(&ctx->truelen),
666 SILC_STR_UI_CHAR(&ctx->flags),
667 SILC_STR_UI_CHAR(&ctx->type),
668 SILC_STR_UI_CHAR(&padlen),
669 SILC_STR_UI_CHAR(&tmp),
670 SILC_STR_UI_CHAR(&src_id_len),
671 SILC_STR_UI_CHAR(&dst_id_len),
672 SILC_STR_UI_CHAR(&src_id_type),
674 if (len == -1 || tmp != 0) {
675 SILC_LOG_ERROR(("Malformed packet header, packet dropped"));
676 return SILC_PACKET_NONE;
679 if (src_id_len > SILC_PACKET_MAX_ID_LEN ||
680 dst_id_len > SILC_PACKET_MAX_ID_LEN) {
681 SILC_LOG_ERROR(("Bad ID lengths in packet (%d and %d)",
682 src_id_len, dst_id_len));
683 return SILC_PACKET_NONE;
686 silc_buffer_pull(buffer, len);
687 ret = silc_buffer_unformat(buffer,
688 SILC_STR_UI_XNSTRING_ALLOC(&ctx->src_id,
690 SILC_STR_UI_CHAR(&dst_id_type),
691 SILC_STR_UI_XNSTRING_ALLOC(&ctx->dst_id,
693 SILC_STR_UI_XNSTRING(NULL, padlen),
696 SILC_LOG_ERROR(("Malformed packet header, packet dropped"));
697 return SILC_PACKET_NONE;
700 if (src_id_type > SILC_ID_CHANNEL || dst_id_type > SILC_ID_CHANNEL) {
701 SILC_LOG_ERROR(("Bad ID types in packet (%d and %d)",
702 src_id_type, dst_id_type));
703 return SILC_PACKET_NONE;
706 ctx->src_id_len = src_id_len;
707 ctx->dst_id_len = dst_id_len;
708 ctx->src_id_type = src_id_type;
709 ctx->dst_id_type = dst_id_type;
710 ctx->padlen = padlen;
712 silc_buffer_push(buffer, len);
714 SILC_LOG_HEXDUMP(("parsed packet, len %d", ctx->buffer->len),
715 ctx->buffer->data, ctx->buffer->len);
717 /* Pull SILC header and padding from packet */
718 silc_buffer_pull(buffer, SILC_PACKET_HEADER_LEN +
719 ctx->src_id_len + ctx->dst_id_len + ctx->padlen);
721 SILC_LOG_DEBUG(("Incoming packet type: %d", ctx->type));
726 /* Allocate packet context */
728 SilcPacketContext *silc_packet_context_alloc(void)
730 SilcPacketContext *ctx = silc_calloc(1, sizeof(*ctx));
737 /* Increse the reference count of the packet context. */
739 SilcPacketContext *silc_packet_context_dup(SilcPacketContext *ctx)
742 SILC_LOG_DEBUG(("Packet context %p refcnt %d->%d", ctx, ctx->users - 1,
747 /* Decrese the reference count of the packet context and free it only if
750 void silc_packet_context_free(SilcPacketContext *ctx)
753 SILC_LOG_DEBUG(("Packet context %p refcnt %d->%d", ctx, ctx->users + 1,
758 silc_buffer_free(ctx->buffer);
760 silc_free(ctx->src_id);
762 silc_free(ctx->dst_id);