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"));
505 SILC_LOG_DEBUG(("MAC is Ok"));
511 /* Decrypts SILC packet. Handles both normal and special packet decryption.
512 Return 0 when packet is normal and 1 when it it special, -1 on error. */
514 static int silc_packet_decrypt(SilcCipher cipher, SilcHmac hmac,
515 SilcUInt32 sequence, SilcBuffer buffer,
518 /* If the packet type is not any special type lets decrypt rest
519 of the packet here. */
520 if (normal == TRUE) {
522 /* Decrypt rest of the packet */
523 SILC_LOG_DEBUG(("Decrypting the packet"));
524 if (!silc_cipher_decrypt(cipher, buffer->data, buffer->data,
525 buffer->len, NULL)) {
526 SILC_LOG_ERROR(("silc_cipher_decrypt failed"));
533 /* Decrypt rest of the header plus padding */
536 SilcUInt32 block_len = silc_cipher_get_block_len(cipher);
538 SILC_LOG_DEBUG(("Decrypting the header"));
540 /* padding length + src id len + dst id len + header length - 16
541 bytes already decrypted, gives the rest of the encrypted packet */
542 silc_buffer_push(buffer, block_len);
543 len = (((SilcUInt8)buffer->data[4] + (SilcUInt8)buffer->data[6] +
544 (SilcUInt8)buffer->data[7] + SILC_PACKET_HEADER_LEN) -
546 silc_buffer_pull(buffer, block_len);
548 if (len > buffer->len) {
549 SILC_LOG_ERROR(("Garbage in header of packet, bad packet length, "
553 if (!silc_cipher_decrypt(cipher, buffer->data, buffer->data,
555 SILC_LOG_ERROR(("silc_cipher_decrypt failed"));
564 /* Parses the packet. This is called when a whole packet is ready to be
565 parsed. The buffer sent must be already decrypted before calling this
566 function. The len argument must be the true length of the packet. This
567 function returns the type of the packet. The data section of the
568 buffer is parsed, not head or tail sections. */
570 SilcPacketType silc_packet_parse(SilcPacketContext *ctx, SilcCipher cipher)
572 SilcBuffer buffer = ctx->buffer;
575 SilcUInt8 src_id_len, src_id_type, dst_id_len, dst_id_type, padlen;
577 SILC_LOG_DEBUG(("Parsing incoming packet"));
579 /* Check the length of the buffer */
580 if (buffer->len < SILC_PACKET_MIN_LEN) {
581 SILC_LOG_ERROR(("Bad packet length: %d, packet dropped", buffer->len));
582 return SILC_PACKET_NONE;
585 /* Parse the buffer. This parses the SILC header of the packet. */
586 len = silc_buffer_unformat(buffer,
587 SILC_STR_UI_SHORT(&ctx->truelen),
588 SILC_STR_UI_CHAR(&ctx->flags),
589 SILC_STR_UI_CHAR(&ctx->type),
590 SILC_STR_UI_CHAR(&padlen),
591 SILC_STR_UI_CHAR(&tmp),
592 SILC_STR_UI_CHAR(&src_id_len),
593 SILC_STR_UI_CHAR(&dst_id_len),
594 SILC_STR_UI_CHAR(&src_id_type),
596 if (len == -1 || tmp != 0)
597 return SILC_PACKET_NONE;
599 if (src_id_len > SILC_PACKET_MAX_ID_LEN ||
600 dst_id_len > SILC_PACKET_MAX_ID_LEN) {
601 SILC_LOG_ERROR(("Bad ID lengths in packet (%d and %d)",
602 src_id_len, dst_id_len));
603 return SILC_PACKET_NONE;
606 silc_buffer_pull(buffer, len);
607 ret = silc_buffer_unformat(buffer,
608 SILC_STR_UI_XNSTRING_ALLOC(&ctx->src_id,
610 SILC_STR_UI_CHAR(&dst_id_type),
611 SILC_STR_UI_XNSTRING_ALLOC(&ctx->dst_id,
613 SILC_STR_UI_XNSTRING(NULL, padlen),
616 return SILC_PACKET_NONE;
618 if (src_id_type > SILC_ID_CHANNEL || dst_id_type > SILC_ID_CHANNEL) {
619 SILC_LOG_ERROR(("Bad ID types in packet (%d and %d)",
620 src_id_type, dst_id_type));
621 return SILC_PACKET_NONE;
624 ctx->src_id_len = src_id_len;
625 ctx->dst_id_len = dst_id_len;
626 ctx->src_id_type = src_id_type;
627 ctx->dst_id_type = dst_id_type;
628 ctx->padlen = padlen;
630 silc_buffer_push(buffer, len);
632 SILC_LOG_HEXDUMP(("parsed packet, len %d", ctx->buffer->len),
633 ctx->buffer->data, ctx->buffer->len);
635 /* Pull SILC header and padding from packet */
636 silc_buffer_pull(buffer, SILC_PACKET_HEADER_LEN +
637 ctx->src_id_len + ctx->dst_id_len + ctx->padlen);
639 SILC_LOG_DEBUG(("Incoming packet type: %d", ctx->type));
644 /* Perform special SILC Packet header parsing. This is required to some
645 packet types that have the data payload encrypted with different key
646 than the header area plus padding of the packet. Hence, this parses
647 the header in a way that it does not take the data area into account
648 and parses the header and padding area only. */
650 SilcPacketType silc_packet_parse_special(SilcPacketContext *ctx,
653 SilcBuffer buffer = ctx->buffer;
656 SilcUInt8 src_id_len, src_id_type, dst_id_len, dst_id_type, padlen;
658 SILC_LOG_DEBUG(("Parsing incoming packet"));
660 /* Check the length of the buffer */
661 if (buffer->len < SILC_PACKET_MIN_LEN) {
662 SILC_LOG_ERROR(("Bad packet length: %d, packet dropped", buffer->len));
663 return SILC_PACKET_NONE;
666 /* Parse the buffer. This parses the SILC header of the packet. */
667 len = silc_buffer_unformat(buffer,
668 SILC_STR_UI_SHORT(&ctx->truelen),
669 SILC_STR_UI_CHAR(&ctx->flags),
670 SILC_STR_UI_CHAR(&ctx->type),
671 SILC_STR_UI_CHAR(&padlen),
672 SILC_STR_UI_CHAR(&tmp),
673 SILC_STR_UI_CHAR(&src_id_len),
674 SILC_STR_UI_CHAR(&dst_id_len),
675 SILC_STR_UI_CHAR(&src_id_type),
677 if (len == -1 || tmp != 0) {
678 SILC_LOG_ERROR(("Malformed packet header, packet dropped"));
679 return SILC_PACKET_NONE;
682 if (src_id_len > SILC_PACKET_MAX_ID_LEN ||
683 dst_id_len > SILC_PACKET_MAX_ID_LEN) {
684 SILC_LOG_ERROR(("Bad ID lengths in packet (%d and %d)",
685 src_id_len, dst_id_len));
686 return SILC_PACKET_NONE;
689 silc_buffer_pull(buffer, len);
690 ret = silc_buffer_unformat(buffer,
691 SILC_STR_UI_XNSTRING_ALLOC(&ctx->src_id,
693 SILC_STR_UI_CHAR(&dst_id_type),
694 SILC_STR_UI_XNSTRING_ALLOC(&ctx->dst_id,
696 SILC_STR_UI_XNSTRING(NULL, padlen),
699 SILC_LOG_ERROR(("Malformed packet header, packet dropped"));
700 return SILC_PACKET_NONE;
703 if (src_id_type > SILC_ID_CHANNEL || dst_id_type > SILC_ID_CHANNEL) {
704 SILC_LOG_ERROR(("Bad ID types in packet (%d and %d)",
705 src_id_type, dst_id_type));
706 return SILC_PACKET_NONE;
709 ctx->src_id_len = src_id_len;
710 ctx->dst_id_len = dst_id_len;
711 ctx->src_id_type = src_id_type;
712 ctx->dst_id_type = dst_id_type;
713 ctx->padlen = padlen;
715 silc_buffer_push(buffer, len);
717 SILC_LOG_HEXDUMP(("parsed packet, len %d", ctx->buffer->len),
718 ctx->buffer->data, ctx->buffer->len);
720 /* Pull SILC header and padding from packet */
721 silc_buffer_pull(buffer, SILC_PACKET_HEADER_LEN +
722 ctx->src_id_len + ctx->dst_id_len + ctx->padlen);
724 SILC_LOG_DEBUG(("Incoming packet type: %d", ctx->type));
729 /* Allocate packet context */
731 SilcPacketContext *silc_packet_context_alloc(void)
733 SilcPacketContext *ctx = silc_calloc(1, sizeof(*ctx));
740 /* Increse the reference count of the packet context. */
742 SilcPacketContext *silc_packet_context_dup(SilcPacketContext *ctx)
745 SILC_LOG_DEBUG(("Packet context %p refcnt %d->%d", ctx, ctx->users - 1,
750 /* Decrese the reference count of the packet context and free it only if
753 void silc_packet_context_free(SilcPacketContext *ctx)
756 SILC_LOG_DEBUG(("Packet context %p refcnt %d->%d", ctx, ctx->users + 1,
761 silc_buffer_free(ctx->buffer);
763 silc_free(ctx->src_id);
765 silc_free(ctx->dst_id);