+++ /dev/null
-/*
-
- silcchannel.c
-
- Author: Pekka Riikonen <priikone@silcnet.org>
-
- Copyright (C) 1997 - 2005 Pekka Riikonen
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; version 2 of the License.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
-*/
-/* Channel Payload and Channel Key Payload implementations. */
-/* $Id$ */
-
-#include "silc.h"
-#include "silcchannel.h"
-
-/******************************************************************************
-
- Channel Payload
-
-******************************************************************************/
-
-/* Channel Message Payload structure. Contents of this structure is parsed
- from SILC packets. */
-struct SilcChannelPayloadStruct {
- unsigned char *channel_name;
- unsigned char *channel_id;
- SilcUInt32 mode;
- SilcUInt16 name_len;
- SilcUInt16 id_len;
-};
-
-/* Parses channel payload returning new channel payload structure. */
-
-SilcChannelPayload silc_channel_payload_parse(const unsigned char *payload,
- SilcUInt32 payload_len)
-{
- SilcBufferStruct buffer;
- SilcChannelPayload newp;
- int ret;
-
- SILC_LOG_DEBUG(("Parsing channel payload"));
-
- silc_buffer_set(&buffer, (unsigned char *)payload, payload_len);
- newp = silc_calloc(1, sizeof(*newp));
- if (!newp)
- return NULL;
-
- /* Parse the Channel Payload. Ignore the padding. */
- ret = silc_buffer_unformat(&buffer,
- SILC_STR_UI16_NSTRING_ALLOC(&newp->channel_name,
- &newp->name_len),
- SILC_STR_UI16_NSTRING_ALLOC(&newp->channel_id,
- &newp->id_len),
- SILC_STR_UI_INT(&newp->mode),
- SILC_STR_END);
- if (ret == -1)
- goto err;
-
- if ((newp->name_len < 1 || newp->name_len > silc_buffer_len(&buffer) - 8) ||
- (newp->id_len < 1 || newp->id_len > silc_buffer_len(&buffer) - 8) ||
- (newp->id_len + newp->name_len > silc_buffer_len(&buffer) - 8)) {
- SILC_LOG_ERROR(("Incorrect channel payload in packet, packet dropped"));
- goto err;
- }
-
- return newp;
-
- err:
- silc_channel_payload_free(newp);
- return NULL;
-}
-
-/* Parses list of channel payloads returning list of payloads. */
-
-SilcDList silc_channel_payload_parse_list(const unsigned char *payload,
- SilcUInt32 payload_len)
-{
- SilcBufferStruct buffer;
- SilcDList list;
- SilcChannelPayload newp;
- SilcUInt32 len;
- int ret;
-
- SILC_LOG_DEBUG(("Parsing channel payload list"));
-
- silc_buffer_set(&buffer, (unsigned char *)payload, payload_len);
- list = silc_dlist_init();
-
- while (silc_buffer_len(&buffer)) {
- newp = silc_calloc(1, sizeof(*newp));
- if (!newp)
- goto err;
- ret = silc_buffer_unformat(&buffer,
- SILC_STR_UI16_NSTRING_ALLOC(&newp->channel_name,
- &newp->name_len),
- SILC_STR_UI16_NSTRING_ALLOC(&newp->channel_id,
- &newp->id_len),
- SILC_STR_UI_INT(&newp->mode),
- SILC_STR_END);
- if (ret == -1)
- goto err;
-
- if ((newp->name_len < 1 || newp->name_len > silc_buffer_len(&buffer) - 8) ||
- (newp->id_len < 1 || newp->id_len > silc_buffer_len(&buffer) - 8) ||
- (newp->id_len + newp->name_len > silc_buffer_len(&buffer) - 8)) {
- SILC_LOG_ERROR(("Incorrect channel payload in packet, packet dropped"));
- goto err;
- }
-
- len = 2 + newp->name_len + 2 + newp->id_len + 4;
- if (silc_buffer_len(&buffer) < len)
- break;
- silc_buffer_pull(&buffer, len);
-
- silc_dlist_add(list, newp);
- }
-
- return list;
-
- err:
- silc_channel_payload_list_free(list);
- return NULL;
-}
-
-/* Encode new channel payload and returns it as buffer. */
-
-SilcBuffer silc_channel_payload_encode(const unsigned char *channel_name,
- SilcUInt16 channel_name_len,
- const unsigned char *channel_id,
- SilcUInt32 channel_id_len,
- SilcUInt32 mode)
-{
- SilcBuffer buffer;
-
- SILC_LOG_DEBUG(("Encoding message payload"));
-
- buffer = silc_buffer_alloc_size(2 + channel_name_len + 2 +
- channel_id_len + 4);
- if (!buffer)
- return NULL;
-
- /* Encode the Channel Payload */
- silc_buffer_format(buffer,
- SILC_STR_UI_SHORT(channel_name_len),
- SILC_STR_UI_XNSTRING(channel_name, channel_name_len),
- SILC_STR_UI_SHORT(channel_id_len),
- SILC_STR_UI_XNSTRING(channel_id, channel_id_len),
- SILC_STR_UI_INT(mode),
- SILC_STR_END);
-
- return buffer;
-}
-
-/* Frees Channel Payload */
-
-void silc_channel_payload_free(SilcChannelPayload payload)
-{
- silc_free(payload->channel_name);
- silc_free(payload->channel_id);
- silc_free(payload);
-}
-
-/* Free's list of Channel Payloads */
-
-void silc_channel_payload_list_free(SilcDList list)
-{
- SilcChannelPayload entry;
-
- silc_dlist_start(list);
- while ((entry = silc_dlist_get(list)) != SILC_LIST_END) {
- silc_free(entry->channel_name);
- silc_free(entry->channel_id);
- silc_dlist_del(list, entry);
- silc_free(entry);
- }
-
- silc_dlist_uninit(list);
-}
-
-/* Return the channel name */
-
-unsigned char *silc_channel_get_name(SilcChannelPayload payload,
- SilcUInt32 *channel_name_len)
-{
- if (channel_name_len)
- *channel_name_len = payload->name_len;
-
- return payload->channel_name;
-}
-
-/* Return the channel ID */
-
-unsigned char *silc_channel_get_id(SilcChannelPayload payload,
- SilcUInt32 *channel_id_len)
-{
- if (channel_id_len)
- *channel_id_len = payload->id_len;
-
- return payload->channel_id;
-}
-
-/* Return the channel ID as parsed ID. */
-
-SilcBool silc_channel_get_id_parse(SilcChannelPayload payload,
- SilcChannelID *ret_channel_id)
-{
- return silc_id_str2id(payload->channel_id, payload->id_len,
- SILC_ID_CHANNEL, ret_channel_id,
- sizeof(SilcChannelID));
-}
-
-/* Return the mode. The mode is arbitrary. It can be the mode of the
- channel or perhaps the mode of the client on the channel. The protocol
- dictates what the usage of the mode is in different circumstances. */
-
-SilcUInt32 silc_channel_get_mode(SilcChannelPayload payload)
-{
- return payload->mode;
-}
-
-
-/******************************************************************************
-
- Channel Key Payload
-
-******************************************************************************/
-
-/* Channel Key Payload structrue. Channel keys are parsed from SILC
- packets into this structure. */
-struct SilcChannelKeyPayloadStruct {
- unsigned char *id;
- unsigned char *cipher;
- unsigned char *key;
- SilcUInt16 id_len;
- SilcUInt16 cipher_len;
- SilcUInt16 key_len;
-};
-
-/* Parses channel key payload returning new channel key payload structure */
-
-SilcChannelKeyPayload
-silc_channel_key_payload_parse(const unsigned char *payload,
- SilcUInt32 payload_len)
-{
- SilcBufferStruct buffer;
- SilcChannelKeyPayload newp;
- int ret;
-
- SILC_LOG_DEBUG(("Parsing channel key payload"));
-
- silc_buffer_set(&buffer, (unsigned char *)payload, payload_len);
- newp = silc_calloc(1, sizeof(*newp));
- if (!newp)
- return NULL;
-
- /* Parse the Channel Key Payload */
- ret =
- silc_buffer_unformat(&buffer,
- SILC_STR_UI16_NSTRING_ALLOC(&newp->id, &newp->id_len),
- SILC_STR_UI16_NSTRING_ALLOC(&newp->cipher,
- &newp->cipher_len),
- SILC_STR_UI16_NSTRING_ALLOC(&newp->key,
- &newp->key_len),
- SILC_STR_END);
- if (ret == -1)
- goto err;
-
- if (newp->id_len < 1 || newp->key_len < 1 || newp->cipher_len < 1 ||
- newp->id_len + newp->cipher_len + newp->key_len > silc_buffer_len(&buffer) - 6) {
- SILC_LOG_ERROR(("Incorrect channel key payload in packet"));
- goto err;
- }
-
- return newp;
-
- err:
- if (newp->id)
- silc_free(newp->id);
- if (newp->cipher)
- silc_free(newp->cipher);
- if (newp->key)
- silc_free(newp->key);
- silc_free(newp);
- return NULL;
-}
-
-/* Encodes channel key payload into a buffer and returns it. This is used
- to add channel key payload into a packet. */
-
-SilcBuffer silc_channel_key_payload_encode(SilcUInt16 id_len,
- const unsigned char *id,
- SilcUInt16 cipher_len,
- const unsigned char *cipher,
- SilcUInt16 key_len,
- const unsigned char *key)
-{
- SilcBuffer buffer;
- SilcUInt32 len;
-
- SILC_LOG_DEBUG(("Encoding channel key payload"));
-
- /* Allocate channel payload buffer. Length is 2 + id + 2 + key +
- 2 + cipher */
- len = 2 + id_len + 2 + key_len + 2 + cipher_len;
- buffer = silc_buffer_alloc_size(len);
- if (!buffer)
- return NULL;
-
- /* Encode the Channel Payload */
- silc_buffer_format(buffer,
- SILC_STR_UI_SHORT(id_len),
- SILC_STR_UI_XNSTRING(id, id_len),
- SILC_STR_UI_SHORT(cipher_len),
- SILC_STR_UI_XNSTRING(cipher, cipher_len),
- SILC_STR_UI_SHORT(key_len),
- SILC_STR_UI_XNSTRING(key, key_len),
- SILC_STR_END);
-
- return buffer;
-}
-
-/* Frees Channel Key Payload */
-
-void silc_channel_key_payload_free(SilcChannelKeyPayload payload)
-{
- if (payload) {
- silc_free(payload->id);
- silc_free(payload->cipher);
- if (payload->key) {
- memset(payload->key, 0, payload->key_len);
- silc_free(payload->key);
- }
- silc_free(payload);
- }
-}
-
-/* Return ID */
-
-unsigned char *silc_channel_key_get_id(SilcChannelKeyPayload payload,
- SilcUInt32 *id_len)
-{
- if (id_len)
- *id_len = payload->id_len;
-
- return payload->id;
-}
-
-/* Return cipher name */
-
-unsigned char *silc_channel_key_get_cipher(SilcChannelKeyPayload payload,
- SilcUInt32 *cipher_len)
-{
- if (cipher_len)
- *cipher_len = payload->cipher_len;
-
- return payload->cipher;
-}
-
-/* Return key */
-
-unsigned char *silc_channel_key_get_key(SilcChannelKeyPayload payload,
- SilcUInt32 *key_len)
-{
- if (key_len)
- *key_len = payload->key_len;
-
- return payload->key;
-}
projects / crypto.git / blobdiff