+++ /dev/null
-/*
-
- silccommand.c
-
- Author: Pekka Riikonen <priikone@silcnet.org>
-
- Copyright (C) 1997 - 2006 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.
-
-*/
-/* $Id$ */
-
-#include "silc.h"
-#include "silccommand.h"
-
-/******************************************************************************
-
- Command Payload
-
-******************************************************************************/
-
-/* Command Payload structure. Contents of this structure is parsed
- from SILC packets. */
-struct SilcCommandPayloadStruct {
- SilcCommand cmd;
- SilcUInt16 ident;
- SilcArgumentPayload args;
-};
-
-/* Length of the command payload */
-#define SILC_COMMAND_PAYLOAD_LEN 6
-
-/* Parses command payload returning new command payload structure */
-
-SilcCommandPayload silc_command_payload_parse(const unsigned char *payload,
- SilcUInt32 payload_len)
-{
- SilcBufferStruct buffer;
- SilcCommandPayload newp;
- unsigned char args_num;
- SilcUInt16 p_len;
- int ret;
-
- SILC_LOG_DEBUG(("Parsing command payload"));
-
- silc_buffer_set(&buffer, (unsigned char *)payload, payload_len);
- newp = silc_calloc(1, sizeof(*newp));
- if (!newp)
- return NULL;
-
- /* Parse the Command Payload */
- ret = silc_buffer_unformat(&buffer,
- SILC_STR_UI_SHORT(&p_len),
- SILC_STR_UI_CHAR(&newp->cmd),
- SILC_STR_UI_CHAR(&args_num),
- SILC_STR_UI_SHORT(&newp->ident),
- SILC_STR_END);
- if (ret == -1) {
- SILC_LOG_ERROR(("Incorrect command payload in packet"));
- silc_free(newp);
- return NULL;
- }
-
- if (p_len != silc_buffer_len(&buffer)) {
- SILC_LOG_ERROR(("Incorrect command payload in packet"));
- silc_free(newp);
- return NULL;
- }
-
- if (newp->cmd == 0) {
- SILC_LOG_ERROR(("Incorrect command type in command payload"));
- silc_free(newp);
- return NULL;
- }
-
- silc_buffer_pull(&buffer, SILC_COMMAND_PAYLOAD_LEN);
- if (args_num) {
- newp->args = silc_argument_payload_parse(buffer.data,
- silc_buffer_len(&buffer),
- args_num);
- if (!newp->args) {
- silc_free(newp);
- return NULL;
- }
- }
- silc_buffer_push(&buffer, SILC_COMMAND_PAYLOAD_LEN);
-
- return newp;
-}
-
-/* Encodes Command Payload returning it to SilcBuffer. */
-
-SilcBuffer silc_command_payload_encode(SilcCommand cmd,
- SilcUInt32 argc,
- unsigned char **argv,
- SilcUInt32 *argv_lens,
- SilcUInt32 *argv_types,
- SilcUInt16 ident)
-{
- SilcBuffer buffer;
- SilcBuffer args = NULL;
- SilcUInt32 len = 0;
-
- SILC_LOG_DEBUG(("Encoding command payload"));
-
- if (argc) {
- args = silc_argument_payload_encode(argc, argv, argv_lens, argv_types);
- if (!args)
- return NULL;
- len = silc_buffer_len(args);
- }
-
- len += SILC_COMMAND_PAYLOAD_LEN;
- buffer = silc_buffer_alloc_size(len);
- if (!buffer)
- return NULL;
-
- /* Create Command payload */
- silc_buffer_format(buffer,
- SILC_STR_UI_SHORT(len),
- SILC_STR_UI_CHAR(cmd),
- SILC_STR_UI_CHAR(argc),
- SILC_STR_UI_SHORT(ident),
- SILC_STR_END);
-
- /* Add arguments */
- if (argc) {
- silc_buffer_pull(buffer, SILC_COMMAND_PAYLOAD_LEN);
- silc_buffer_format(buffer,
- SILC_STR_UI_XNSTRING(args->data,
- silc_buffer_len(args)),
- SILC_STR_END);
- silc_buffer_push(buffer, SILC_COMMAND_PAYLOAD_LEN);
- silc_buffer_free(args);
- }
-
- return buffer;
-}
-
-/* Same as above but encode the buffer from SilcCommandPayload structure
- instead of raw data. */
-
-SilcBuffer silc_command_payload_encode_payload(SilcCommandPayload payload)
-{
- SilcBuffer buffer;
- SilcBuffer args = NULL;
- SilcUInt32 len = 0;
- SilcUInt32 argc = 0;
-
- SILC_LOG_DEBUG(("Encoding command payload"));
-
- if (payload->args) {
- args = silc_argument_payload_encode_payload(payload->args);
- if (args)
- len = silc_buffer_len(args);
- argc = silc_argument_get_arg_num(payload->args);
- }
-
- len += SILC_COMMAND_PAYLOAD_LEN;
- buffer = silc_buffer_alloc_size(len);
- if (!buffer) {
- if (args)
- silc_buffer_free(args);
- return NULL;
- }
-
- /* Create Command payload */
- silc_buffer_format(buffer,
- SILC_STR_UI_SHORT(len),
- SILC_STR_UI_CHAR(payload->cmd),
- SILC_STR_UI_CHAR(argc),
- SILC_STR_UI_SHORT(payload->ident),
- SILC_STR_END);
-
- /* Add arguments */
- if (args) {
- silc_buffer_pull(buffer, SILC_COMMAND_PAYLOAD_LEN);
- silc_buffer_format(buffer,
- SILC_STR_UI_XNSTRING(args->data,
- silc_buffer_len(args)),
- SILC_STR_END);
- silc_buffer_push(buffer, SILC_COMMAND_PAYLOAD_LEN);
- silc_buffer_free(args);
- }
-
- return buffer;
-}
-
-/* Encodes Command payload with variable argument list. The arguments
- must be: SilcUInt32, unsigned char *, unsigned int, ... One
- {SilcUInt32, unsigned char * and unsigned int} forms one argument,
- thus `argc' in case when sending one {SilcUInt32, unsigned char *
- and SilcUInt32} equals one (1) and when sending two of those it
- equals two (2), and so on. This has to be preserved or bad things
- will happen. The variable arguments is: {type, data, data_len}. */
-
-SilcBuffer silc_command_payload_encode_va(SilcCommand cmd,
- SilcUInt16 ident,
- SilcUInt32 argc, ...)
-{
- va_list ap;
- SilcBuffer buffer;
-
- va_start(ap, argc);
- buffer = silc_command_payload_encode_vap(cmd, ident, argc, ap);
- va_end(ap);
-
- return buffer;
-}
-
-/* Same as above but with va_list. */
-
-SilcBuffer silc_command_payload_encode_vap(SilcCommand cmd,
- SilcUInt16 ident,
- SilcUInt32 argc, va_list ap)
-{
- unsigned char **argv = NULL;
- SilcUInt32 *argv_lens = NULL, *argv_types = NULL;
- unsigned char *x;
- SilcUInt32 x_len;
- SilcUInt32 x_type;
- SilcBuffer buffer = NULL;
- int i, k = 0;
-
- if (argc) {
- argv = silc_calloc(argc, sizeof(unsigned char *));
- if (!argv)
- return NULL;
- argv_lens = silc_calloc(argc, sizeof(SilcUInt32));
- if (!argv_lens)
- return NULL;
- argv_types = silc_calloc(argc, sizeof(SilcUInt32));
- if (!argv_types)
- return NULL;
-
- for (i = 0, k = 0; i < argc; i++) {
- x_type = va_arg(ap, SilcUInt32);
- x = va_arg(ap, unsigned char *);
- x_len = va_arg(ap, SilcUInt32);
-
- if (!x_type || !x || !x_len)
- continue;
-
- argv[k] = silc_memdup(x, x_len);
- if (!argv[k])
- goto out;
- argv_lens[k] = x_len;
- argv_types[k] = x_type;
- k++;
- }
- }
-
- buffer = silc_command_payload_encode(cmd, k, argv, argv_lens,
- argv_types, ident);
-
- out:
- for (i = 0; i < k; i++)
- silc_free(argv[i]);
- silc_free(argv);
- silc_free(argv_lens);
- silc_free(argv_types);
-
- return buffer;
-}
-
-/* Same as above except that this is used to encode strictly command
- reply packets. The command status message to be returned is sent as
- extra argument to this function. The `argc' must not count `status'
- as on argument. */
-
-SilcBuffer
-silc_command_reply_payload_encode_va(SilcCommand cmd,
- SilcStatus status,
- SilcStatus error,
- SilcUInt16 ident,
- SilcUInt32 argc, ...)
-{
- va_list ap;
- SilcBuffer buffer;
-
- va_start(ap, argc);
- buffer = silc_command_reply_payload_encode_vap(cmd, status, error,
- ident, argc, ap);
- va_end(ap);
-
- return buffer;
-}
-
-SilcBuffer
-silc_command_reply_payload_encode_vap(SilcCommand cmd,
- SilcStatus status,
- SilcStatus error,
- SilcUInt16 ident, SilcUInt32 argc,
- va_list ap)
-{
- unsigned char **argv;
- SilcUInt32 *argv_lens = NULL, *argv_types = NULL;
- unsigned char status_data[2];
- unsigned char *x;
- SilcUInt32 x_len;
- SilcUInt32 x_type;
- SilcBuffer buffer = NULL;
- int i, k;
-
- argc++;
- argv = silc_calloc(argc, sizeof(unsigned char *));
- if (!argv)
- return NULL;
- argv_lens = silc_calloc(argc, sizeof(SilcUInt32));
- if (!argv_lens) {
- silc_free(argv);
- return NULL;
- }
- argv_types = silc_calloc(argc, sizeof(SilcUInt32));
- if (!argv_types) {
- silc_free(argv_lens);
- silc_free(argv);
- return NULL;
- }
-
- status_data[0] = status;
- status_data[1] = error;
- argv[0] = silc_memdup(status_data, sizeof(status_data));
- if (!argv[0]) {
- silc_free(argv_types);
- silc_free(argv_lens);
- silc_free(argv);
- return NULL;
- }
- argv_lens[0] = sizeof(status_data);
- argv_types[0] = 1;
-
- for (i = 1, k = 1; i < argc; i++) {
- x_type = va_arg(ap, SilcUInt32);
- x = va_arg(ap, unsigned char *);
- x_len = va_arg(ap, SilcUInt32);
-
- if (!x_type || !x || !x_len)
- continue;
-
- argv[k] = silc_memdup(x, x_len);
- if (!argv[k])
- goto out;
- argv_lens[k] = x_len;
- argv_types[k] = x_type;
- k++;
- }
-
- buffer = silc_command_payload_encode(cmd, k, argv, argv_lens,
- argv_types, ident);
-
- out:
- for (i = 0; i < k; i++)
- silc_free(argv[i]);
- silc_free(argv);
- silc_free(argv_lens);
- silc_free(argv_types);
-
- return buffer;
-}
-
-/* Frees Command Payload */
-
-void silc_command_payload_free(SilcCommandPayload payload)
-{
- if (payload) {
- silc_argument_payload_free(payload->args);
- silc_free(payload);
- }
-}
-
-/* Returns command */
-
-SilcCommand silc_command_get(SilcCommandPayload payload)
-{
- return payload->cmd;
-}
-
-/* Retuns arguments payload */
-
-SilcArgumentPayload silc_command_get_args(SilcCommandPayload payload)
-{
- return payload->args;
-}
-
-/* Returns identifier */
-
-SilcUInt16 silc_command_get_ident(SilcCommandPayload payload)
-{
- return payload->ident;
-}
-
-/* Return command status */
-
-SilcBool silc_command_get_status(SilcCommandPayload payload,
- SilcStatus *status,
- SilcStatus *error)
-{
- unsigned char *tmp;
- SilcUInt32 tmp_len;
-
- if (!payload->args)
- return 0;
- tmp = silc_argument_get_arg_type(payload->args, 1, &tmp_len);
- if (!tmp || tmp_len != 2)
- return 0;
-
- /* Check for 1.0 protocol version which didn't have `error' */
- if (tmp[0] == 0 && tmp[1] != 0) {
- /* Protocol 1.0 version */
- SilcStatus s;
- SILC_GET16_MSB(s, tmp);
- if (status)
- *status = s;
- if (error)
- *error = 0;
- if (s >= SILC_STATUS_ERR_NO_SUCH_NICK && error)
- *error = s;
- return (s < SILC_STATUS_ERR_NO_SUCH_NICK);
- }
-
- /* Take both status and possible error */
- if (status)
- *status = (SilcStatus)tmp[0];
- if (error)
- *error = (SilcStatus)tmp[1];
-
- /* If single error occurred have the both `status' and `error' indicate
- the error value for convenience. */
- if (tmp[0] >= SILC_STATUS_ERR_NO_SUCH_NICK && error)
- *error = tmp[0];
-
- return (tmp[0] < SILC_STATUS_ERR_NO_SUCH_NICK && tmp[1] == SILC_STATUS_OK);
-}
-
-/* Function to set identifier to already allocated Command Payload. Command
- payloads are frequentlly resent in SILC and thusly this makes it easy
- to set the identifier. */
-
-void silc_command_set_ident(SilcCommandPayload payload, SilcUInt16 ident)
-{
- payload->ident = ident;
-}
-
-/* Function to set the command to already allocated Command Payload. */
-
-void silc_command_set_command(SilcCommandPayload payload, SilcCommand command)
-{
- payload->cmd = command;
-}
projects / crypto.git / blobdiff