5 Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
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; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
21 * Created: Fri Jul 25 18:52:14 1997
25 #include "silcincludes.h"
27 /******************************************************************************
29 Packet Sending Routines
31 ******************************************************************************/
33 /* Writes data from encrypted buffer to the socket connection. If the
34 data cannot be written at once, it will be written later with a timeout.
35 The data is written from the data section of the buffer, not from head
36 or tail section. This automatically pulls the data section towards end
37 after writing the data. */
39 int silc_packet_write(int sock, SilcBuffer src)
43 SILC_LOG_DEBUG(("Writing data to socket %d", sock));
46 ret = write(sock, src->data, src->len);
48 if (errno == EAGAIN) {
49 SILC_LOG_DEBUG(("Could not write immediately, will do it later"));
52 SILC_LOG_ERROR(("Cannot write to socket: %s", strerror(errno)));
56 silc_buffer_pull(src, ret);
59 SILC_LOG_DEBUG(("Wrote data %d bytes", ret));
64 /* Actually sends the packet. This flushes the connections outgoing data
65 buffer. If data is sent directly to the network this returns the bytes
66 written, if error occured this returns -1 and if the data could not
67 be written directly to the network at this time this returns -2, in
68 which case the data should be queued by the caller and sent at some
69 later time. If `force_send' is TRUE this attempts to write the data
70 directly to the network, if FALSE, this returns -2. */
72 int silc_packet_send(SilcSocketConnection sock, int force_send)
74 SILC_LOG_DEBUG(("Sending packet to %s:%d [%s]", sock->hostname,
76 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
77 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
78 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
81 /* Send now if forced to do so */
82 if (force_send == TRUE) {
85 SILC_LOG_DEBUG(("Forcing packet send, packet sent immediately"));
87 /* Write to network */
88 ret = silc_packet_write(sock->sock, sock->outbuf);
91 SILC_LOG_ERROR(("Error sending packet, dropped"));
96 SILC_LOG_DEBUG(("Could not force the send, packet put to queue"));
99 SILC_LOG_DEBUG(("Packet in queue"));
104 /* Encrypts a packet. This also creates HMAC of the packet before
105 encryption and adds the HMAC at the end of the buffer. This assumes
106 that there is enough free space at the end of the buffer to add the
107 computed HMAC. This is the normal way of encrypting packets, if some
108 other process of HMAC computing and encryption is needed this function
111 void silc_packet_encrypt(SilcCipher cipher, SilcHmac hmac,
112 SilcBuffer buffer, uint32 len)
114 unsigned char mac[32];
117 /* Compute HMAC. This assumes that HMAC is created from the entire
118 data area thus this uses the length found in buffer, not the length
121 silc_hmac_make(hmac, buffer->data, buffer->len, mac, &mac_len);
122 silc_buffer_put_tail(buffer, mac, mac_len);
123 memset(mac, 0, sizeof(mac));
126 /* Encrypt the data area of the packet. 2 bytes of the packet
127 are not encrypted. */
129 SILC_LOG_DEBUG(("Encrypting packet, cipher %s, len %d (%d)",
130 cipher->cipher->name, len, len - 2));
131 cipher->cipher->encrypt(cipher->context, buffer->data + 2,
132 buffer->data + 2, len - 2, cipher->iv);
135 /* Pull the HMAC into the visible data area in the buffer */
137 silc_buffer_pull_tail(buffer, mac_len);
140 /* Assembles a new packet to be ready for send out. The buffer sent as
141 argument must include the data to be sent and it must not be encrypted.
142 The packet also must have enough free space so that the SILC header
143 and padding maybe added to the packet. The packet is encrypted after
144 this function has returned.
146 The buffer sent as argument should be something like following:
148 --------------------------------------------
149 | head | data | tail |
150 --------------------------------------------
154 So that the SILC header and 1 - 16 bytes of padding can fit to
155 the buffer. After assembly the buffer might look like this:
157 --------------------------------------------
159 --------------------------------------------
161 Start of assembled packet
163 Packet construct is as follows (* = won't be encrypted):
166 2 bytes Payload length (*)
169 2 bytes Source ID Length
170 2 bytes Destination ID Length
171 1 byte Source ID Type
173 1 byte Destination ID Type
174 n bytes Destination ID
180 All fields in the packet will be authenticated by MAC. The MAC is
181 not computed here, it must be computed separately before encrypting
186 void silc_packet_assemble(SilcPacketContext *ctx)
188 unsigned char tmppad[SILC_PACKET_MAX_PADLEN];
191 SILC_LOG_DEBUG(("Assembling outgoing packet"));
193 /* Get the true length of the packet. This is saved as payload length
194 into the packet header. This does not include the length of the
197 ctx->truelen = ctx->buffer->len + SILC_PACKET_HEADER_LEN +
198 ctx->src_id_len + ctx->dst_id_len;
200 /* Calculate the length of the padding. The padding is calculated from
201 the data that will be encrypted. As protocol states 3 first bytes
202 of the packet are not encrypted they are not included in the
203 padding calculation. */
205 ctx->padlen = SILC_PACKET_PADLEN(ctx->truelen);
207 /* Put the start of the data section to the right place. */
208 silc_buffer_push(ctx->buffer, SILC_PACKET_HEADER_LEN +
209 ctx->src_id_len + ctx->dst_id_len + ctx->padlen);
211 /* Get random padding */
213 for (i = 0; i < ctx->padlen; i++) tmppad[i] = silc_rng_global_get_byte();
215 /* XXX: For testing - to be removed */
216 memset(tmppad, 65, sizeof(tmppad));
219 /* Create the packet. This creates the SILC header and adds padding,
220 rest of the buffer remains as it is. */
221 silc_buffer_format(ctx->buffer,
222 SILC_STR_UI_SHORT(ctx->truelen),
223 SILC_STR_UI_CHAR(ctx->flags),
224 SILC_STR_UI_CHAR(ctx->type),
225 SILC_STR_UI_SHORT(ctx->src_id_len),
226 SILC_STR_UI_SHORT(ctx->dst_id_len),
227 SILC_STR_UI_CHAR(ctx->src_id_type),
228 SILC_STR_UI_XNSTRING(ctx->src_id, ctx->src_id_len),
229 SILC_STR_UI_CHAR(ctx->dst_id_type),
230 SILC_STR_UI_XNSTRING(ctx->dst_id, ctx->dst_id_len),
231 SILC_STR_UI_XNSTRING(tmppad, ctx->padlen),
234 SILC_LOG_HEXDUMP(("Assembled packet, len %d", ctx->buffer->len),
235 ctx->buffer->data, ctx->buffer->len);
237 SILC_LOG_DEBUG(("Outgoing packet assembled"));
240 /* Prepare outgoing data buffer for packet sending. This moves the data
241 area so that new packet may be added into it. If needed this allocates
242 more space to the buffer. This handles directly the connection's
243 outgoing buffer in SilcSocketConnection object. */
245 void silc_packet_send_prepare(SilcSocketConnection sock,
252 totlen = header_len + padlen + data_len;
254 /* Prepare the outgoing buffer for packet sending. */
256 /* Allocate new buffer. This is done only once per connection. */
257 SILC_LOG_DEBUG(("Allocating outgoing data buffer"));
259 sock->outbuf = silc_buffer_alloc(SILC_PACKET_DEFAULT_SIZE);
260 silc_buffer_pull_tail(sock->outbuf, totlen);
261 silc_buffer_pull(sock->outbuf, header_len + padlen);
263 if (SILC_IS_OUTBUF_PENDING(sock)) {
264 /* There is some pending data in the buffer. */
266 /* Allocate more space if needed */
267 if ((sock->outbuf->end - sock->outbuf->tail) <
269 SILC_LOG_DEBUG(("Reallocating outgoing data buffer"));
270 sock->outbuf = silc_buffer_realloc(sock->outbuf,
271 sock->outbuf->truelen +
275 oldlen = sock->outbuf->len;
276 silc_buffer_pull_tail(sock->outbuf, totlen);
277 silc_buffer_pull(sock->outbuf, header_len + padlen + oldlen);
279 /* Buffer is free for use */
280 silc_buffer_clear(sock->outbuf);
282 /* Allocate more space if needed */
283 if ((sock->outbuf->end - sock->outbuf->tail) < (totlen + 20)) {
284 SILC_LOG_DEBUG(("Reallocating outgoing data buffer"));
285 sock->outbuf = silc_buffer_realloc(sock->outbuf,
286 sock->outbuf->truelen +
290 silc_buffer_pull_tail(sock->outbuf, totlen);
291 silc_buffer_pull(sock->outbuf, header_len + padlen);
296 /******************************************************************************
298 Packet Reception Routines
300 ******************************************************************************/
302 /* Reads data from the socket connection into the incoming data buffer.
303 However, this does not parse the packet, it only reads some amount from
304 the network. If there are more data available that can be read at a time
305 the rest of the data will be read later with a timeout and only after
306 that the packet is ready to be parsed.
308 The destination buffer sent as argument must be initialized before
309 calling this function, and, the data section and the start of the tail
310 section must be same. Ie. we add the read data to the tail section of
311 the buffer hence the data section is the start of the buffer.
313 This returns amount of bytes read or -1 on error or -2 on case where
314 all of the data could not be read at once. */
316 int silc_packet_read(int fd, SilcSocketConnection sock)
319 unsigned char buf[SILC_PACKET_READ_SIZE];
321 SILC_LOG_DEBUG(("Reading data from socket %d", fd));
323 /* Read the data from the socket. */
324 len = read(fd, buf, sizeof(buf));
326 if (errno == EAGAIN || errno == EINTR) {
327 SILC_LOG_DEBUG(("Could not read immediately, will do it later"));
330 SILC_LOG_ERROR(("Cannot read from socket: %d:%s", fd, strerror(errno)));
337 /* Insert the data to the buffer. */
340 sock->inbuf = silc_buffer_alloc(SILC_PACKET_DEFAULT_SIZE);
342 /* If the data does not fit to the buffer reallocate it */
343 if ((sock->inbuf->end - sock->inbuf->tail) < len)
344 sock->inbuf = silc_buffer_realloc(sock->inbuf, sock->inbuf->truelen +
346 silc_buffer_put_tail(sock->inbuf, buf, len);
347 silc_buffer_pull_tail(sock->inbuf, len);
349 SILC_LOG_DEBUG(("Read %d bytes", len));
354 /* Processes the received data. This checks the received data and
355 calls parser callback that handles the actual packet decryption
356 and parsing. If more than one packet was received this calls the
357 parser multiple times. The parser callback will get context
358 SilcPacketParserContext that includes the packet and the `context'
359 sent to this function. */
361 void silc_packet_receive_process(SilcSocketConnection sock,
362 SilcCipher cipher, SilcHmac hmac,
363 SilcPacketParserCallback parser,
366 SilcPacketParserContext *parse_ctx;
367 int packetlen, paddedlen, count, mac_len = 0;
369 /* We need at least 2 bytes of data to be able to start processing
371 if (sock->inbuf->len < 2)
375 mac_len = hmac->hmac->len;
377 /* Parse the packets from the data */
379 while (sock->inbuf->len > 0) {
380 SILC_PACKET_LENGTH(sock->inbuf, packetlen, paddedlen);
384 if (packetlen < SILC_PACKET_MIN_LEN) {
385 SILC_LOG_DEBUG(("Received invalid packet, dropped"));
386 silc_buffer_clear(sock->inbuf);
390 if (sock->inbuf->len < paddedlen + mac_len) {
391 SILC_LOG_DEBUG(("Received partial packet, waiting for the rest"));
395 parse_ctx = silc_calloc(1, sizeof(*parse_ctx));
396 parse_ctx->packet = silc_packet_context_alloc();
397 parse_ctx->packet->buffer = silc_buffer_alloc(paddedlen + mac_len);
398 parse_ctx->sock = sock;
399 parse_ctx->context = context;
401 silc_buffer_pull_tail(parse_ctx->packet->buffer,
402 SILC_BUFFER_END(parse_ctx->packet->buffer));
403 silc_buffer_put(parse_ctx->packet->buffer, sock->inbuf->data,
404 paddedlen + mac_len);
406 SILC_LOG_HEXDUMP(("Incoming packet, len %d",
407 parse_ctx->packet->buffer->len),
408 parse_ctx->packet->buffer->data,
409 parse_ctx->packet->buffer->len);
411 /* Call the parser */
413 (*parser)(parse_ctx);
415 /* Pull the packet from inbuf thus we'll get the next one
417 silc_buffer_pull(sock->inbuf, paddedlen);
419 silc_buffer_pull(sock->inbuf, mac_len);
422 SILC_LOG_DEBUG(("Clearing inbound buffer"));
423 silc_buffer_clear(sock->inbuf);
426 /* Receives packet from network and reads the data into connection's
427 incoming data buffer. If the data was read directly this returns the
428 read bytes, if error occured this returns -1, if the data could not
429 be read directly at this time this returns -2 in which case the data
430 should be read again at some later time, or If EOF occured this returns
433 int silc_packet_receive(SilcSocketConnection sock)
437 SILC_LOG_DEBUG(("Receiving packet from %s:%d [%s]", sock->hostname,
439 (sock->type == SILC_SOCKET_TYPE_UNKNOWN ? "Unknown" :
440 sock->type == SILC_SOCKET_TYPE_CLIENT ? "Client" :
441 sock->type == SILC_SOCKET_TYPE_SERVER ? "Server" :
444 /* Read some data from connection */
445 ret = silc_packet_read(sock->sock, sock);
450 /* Checks MAC in the packet. Returns TRUE if MAC is Ok. This is called
451 after packet has been totally decrypted and parsed. */
453 static int silc_packet_check_mac(SilcHmac hmac, SilcBuffer buffer)
457 unsigned char mac[32];
460 SILC_LOG_DEBUG(("Verifying MAC"));
462 /* Compute HMAC of packet */
463 memset(mac, 0, sizeof(mac));
464 silc_hmac_make(hmac, buffer->data, buffer->len, mac, &mac_len);
466 /* Compare the HMAC's (buffer->tail has the packet's HMAC) */
467 if (memcmp(mac, buffer->tail, mac_len)) {
468 SILC_LOG_ERROR(("MAC failed"));
472 SILC_LOG_DEBUG(("MAC is Ok"));
473 memset(mac, 0, sizeof(mac));
479 /* Decrypts rest of the packet (after decrypting just the SILC header).
480 After calling this function the packet is ready to be parsed by calling
481 silc_packet_parse. If everything goes without errors this returns TRUE,
482 if packet is malformed this returns FALSE. */
484 static int silc_packet_decrypt_rest(SilcCipher cipher, SilcHmac hmac,
489 /* Pull MAC from packet before decryption */
491 if ((buffer->len - hmac->hmac->len) > SILC_PACKET_MIN_LEN) {
492 silc_buffer_push_tail(buffer, hmac->hmac->len);
494 SILC_LOG_DEBUG(("Bad MAC length in packet, packet dropped"));
499 SILC_LOG_DEBUG(("Decrypting rest of the packet"));
501 /* Decrypt rest of the packet */
502 silc_buffer_pull(buffer, SILC_PACKET_MIN_HEADER_LEN - 2);
503 cipher->cipher->decrypt(cipher->context, buffer->data + 2,
504 buffer->data + 2, buffer->len - 2,
506 silc_buffer_push(buffer, SILC_PACKET_MIN_HEADER_LEN - 2);
508 SILC_LOG_HEXDUMP(("Fully decrypted packet, len %d", buffer->len),
509 buffer->data, buffer->len);
515 /* Decrypts rest of the SILC Packet header that has been decrypted partly
516 already. This decrypts the padding of the packet also. After calling
517 this function the packet is ready to be parsed by calling function
518 silc_packet_parse. This is used in special packet reception (protocol
519 defines the way of decrypting special packets). */
521 static int silc_packet_decrypt_rest_special(SilcCipher cipher,
525 /* Decrypt rest of the header plus padding */
527 uint16 truelen, len1, len2, padlen;
529 /* Pull MAC from packet before decryption */
531 if ((buffer->len - hmac->hmac->len) > SILC_PACKET_MIN_LEN) {
532 silc_buffer_push_tail(buffer, hmac->hmac->len);
534 SILC_LOG_DEBUG(("Bad MAC length in packet, packet dropped"));
539 SILC_LOG_DEBUG(("Decrypting rest of the header"));
541 SILC_GET16_MSB(len1, &buffer->data[4]);
542 SILC_GET16_MSB(len2, &buffer->data[6]);
544 truelen = SILC_PACKET_HEADER_LEN + len1 + len2;
545 padlen = SILC_PACKET_PADLEN(truelen);
546 len1 = (truelen + padlen) - (SILC_PACKET_MIN_HEADER_LEN - 2);
548 silc_buffer_pull(buffer, SILC_PACKET_MIN_HEADER_LEN - 2);
549 cipher->cipher->decrypt(cipher->context, buffer->data + 2,
550 buffer->data + 2, len1 - 2,
552 silc_buffer_push(buffer, SILC_PACKET_MIN_HEADER_LEN - 2);
558 /* Decrypts a packet. This assumes that typical SILC packet is the
559 packet to be decrypted and thus checks for normal and special SILC
560 packets and can handle both of them. This also computes and checks
561 the HMAC of the packet. If any other special or customized decryption
562 processing is required this function cannot be used. This returns
563 -1 on error, 0 when packet is normal packet and 1 when the packet
564 is special and requires special processing.
566 The `check_packet' is a callback funtion that this function will
567 call. The callback relates to the checking whether the packet is
568 normal packet or special packet and how it should be processed. If
569 the callback return TRUE the packet is normal and FALSE if the packet
570 is special and requires special procesing. */
572 int silc_packet_decrypt(SilcCipher cipher, SilcHmac hmac,
573 SilcBuffer buffer, SilcPacketContext *packet,
574 SilcPacketCheckDecrypt check_packet,
579 /* Decrypt start of the packet header */
581 silc_cipher_decrypt(cipher, buffer->data + 2, buffer->data + 2,
582 SILC_PACKET_MIN_HEADER_LEN - 2, cipher->iv);
584 /* Do packet checking, whether the packet is normal or special */
585 check = check_packet((SilcPacketType)buffer->data[3], buffer,
588 /* If the packet type is not any special type lets decrypt rest
589 of the packet here. */
591 /* Normal packet, decrypt rest of the packet */
592 if (!silc_packet_decrypt_rest(cipher, hmac, buffer))
596 if (!silc_packet_check_mac(hmac, buffer))
601 /* Packet requires special handling, decrypt rest of the header.
602 This only decrypts. */
603 if (!silc_packet_decrypt_rest_special(cipher, hmac, buffer))
607 if (!silc_packet_check_mac(hmac, buffer))
614 /* Parses the packet. This is called when a whole packet is ready to be
615 parsed. The buffer sent must be already decrypted before calling this
616 function. The len argument must be the true length of the packet. This
617 function returns the type of the packet. The data section of the
618 buffer is parsed, not head or tail sections. */
620 SilcPacketType silc_packet_parse(SilcPacketContext *ctx)
622 SilcBuffer buffer = ctx->buffer;
625 SILC_LOG_DEBUG(("Parsing incoming packet"));
627 /* Check the length of the buffer */
628 if (buffer->len < SILC_PACKET_MIN_LEN) {
629 SILC_LOG_ERROR(("Bad packet length: %d, packet dropped", buffer->len));
630 return SILC_PACKET_NONE;
633 /* Parse the buffer. This parses the SILC header of the packet. */
634 len = silc_buffer_unformat(buffer,
635 SILC_STR_UI_SHORT(&ctx->truelen),
636 SILC_STR_UI_CHAR(&ctx->flags),
637 SILC_STR_UI_CHAR(&ctx->type),
638 SILC_STR_UI_SHORT(&ctx->src_id_len),
639 SILC_STR_UI_SHORT(&ctx->dst_id_len),
640 SILC_STR_UI_CHAR(&ctx->src_id_type),
643 return SILC_PACKET_NONE;
645 if (ctx->src_id_len > SILC_PACKET_MAX_ID_LEN ||
646 ctx->dst_id_len > SILC_PACKET_MAX_ID_LEN) {
647 SILC_LOG_ERROR(("Bad ID lengths in packet"));
648 return SILC_PACKET_NONE;
651 /* Calculate length of padding in packet */
652 ctx->padlen = SILC_PACKET_PADLEN(ctx->truelen);
654 silc_buffer_pull(buffer, len);
655 ret = silc_buffer_unformat(buffer,
656 SILC_STR_UI_XNSTRING_ALLOC(&ctx->src_id,
658 SILC_STR_UI_CHAR(&ctx->dst_id_type),
659 SILC_STR_UI_XNSTRING_ALLOC(&ctx->dst_id,
661 SILC_STR_UI_XNSTRING(NULL, ctx->padlen),
664 return SILC_PACKET_NONE;
666 silc_buffer_push(buffer, len);
668 SILC_LOG_HEXDUMP(("parsed packet, len %d", ctx->buffer->len),
669 ctx->buffer->data, ctx->buffer->len);
671 /* Pull SILC header and padding from packet */
672 silc_buffer_pull(buffer, SILC_PACKET_HEADER_LEN +
673 ctx->src_id_len + ctx->dst_id_len + ctx->padlen);
675 SILC_LOG_DEBUG(("Incoming packet type: %d", ctx->type));
680 /* Perform special SILC Packet header parsing. This is required to some
681 packet types that have the data payload encrypted with different key
682 than the header area plus padding of the packet. Hence, this parses
683 the header in a way that it does not take the data area into account
684 and parses the header and padding area only. */
686 SilcPacketType silc_packet_parse_special(SilcPacketContext *ctx)
688 SilcBuffer buffer = ctx->buffer;
689 int len, tmplen, ret;
691 SILC_LOG_DEBUG(("Parsing incoming packet"));
693 /* Check the length of the buffer */
694 if (buffer->len < SILC_PACKET_MIN_LEN) {
695 SILC_LOG_ERROR(("Bad packet length: %d, packet dropped", buffer->len));
696 return SILC_PACKET_NONE;
699 /* Parse the buffer. This parses the SILC header of the packet. */
700 len = silc_buffer_unformat(buffer,
701 SILC_STR_UI_SHORT(&ctx->truelen),
702 SILC_STR_UI_CHAR(&ctx->flags),
703 SILC_STR_UI_CHAR(&ctx->type),
704 SILC_STR_UI_SHORT(&ctx->src_id_len),
705 SILC_STR_UI_SHORT(&ctx->dst_id_len),
706 SILC_STR_UI_CHAR(&ctx->src_id_type),
709 return SILC_PACKET_NONE;
711 if (ctx->src_id_len > SILC_PACKET_MAX_ID_LEN ||
712 ctx->dst_id_len > SILC_PACKET_MAX_ID_LEN) {
713 SILC_LOG_ERROR(("Bad ID lengths in packet"));
714 return SILC_PACKET_NONE;
717 /* Calculate length of padding in packet. As this is special packet
718 the data area is not used in the padding calculation as it won't
719 be decrypted by the caller. */
720 tmplen = SILC_PACKET_HEADER_LEN + ctx->src_id_len + ctx->dst_id_len;
721 ctx->padlen = SILC_PACKET_PADLEN(tmplen);
723 silc_buffer_pull(buffer, len);
724 ret = silc_buffer_unformat(buffer,
725 SILC_STR_UI_XNSTRING_ALLOC(&ctx->src_id,
727 SILC_STR_UI_CHAR(&ctx->dst_id_type),
728 SILC_STR_UI_XNSTRING_ALLOC(&ctx->dst_id,
730 SILC_STR_UI_XNSTRING(NULL, ctx->padlen),
733 return SILC_PACKET_NONE;
735 silc_buffer_push(buffer, len);
737 SILC_LOG_HEXDUMP(("parsed packet, len %d", ctx->buffer->len),
738 ctx->buffer->data, ctx->buffer->len);
740 /* Pull SILC header and padding from packet */
741 silc_buffer_pull(buffer, SILC_PACKET_HEADER_LEN +
742 ctx->src_id_len + ctx->dst_id_len + ctx->padlen);
744 SILC_LOG_DEBUG(("Incoming packet type: %d", ctx->type));
749 /* Allocate packet context */
751 SilcPacketContext *silc_packet_context_alloc()
753 SilcPacketContext *ctx = silc_calloc(1, sizeof(*ctx));
758 /* Increse the reference count of the packet context. */
760 SilcPacketContext *silc_packet_context_dup(SilcPacketContext *ctx)
763 SILC_LOG_DEBUG(("Packet context %p refcnt %d->%d", ctx, ctx->users - 1,
768 /* Decrese the reference count of the packet context and free it only if
771 void silc_packet_context_free(SilcPacketContext *ctx)
774 SILC_LOG_DEBUG(("Packet context %p refcnt %d->%d", ctx, ctx->users + 1,
779 silc_buffer_free(ctx->buffer);
781 silc_free(ctx->src_id);
783 silc_free(ctx->dst_id);