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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2006, Digium, Inc.
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief Environment related dialplan functions
*
* \ingroup functions
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include <sys/stat.h>
#include "asterisk/module.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/utils.h"
#include "asterisk/app.h"
static int env_read(struct ast_channel *chan, const char *cmd, char *data,
char *buf, size_t len)
{
char *ret = NULL;
*buf = '\0';
if (data)
ret = getenv(data);
if (ret)
ast_copy_string(buf, ret, len);
return 0;
}
static int env_write(struct ast_channel *chan, const char *cmd, char *data,
const char *value)
{
if (!ast_strlen_zero(data)) {
if (!ast_strlen_zero(value)) {
setenv(data, value, 1);
} else {
unsetenv(data);
}
}
return 0;
}
static int stat_read(struct ast_channel *chan, const char *cmd, char *data,
char *buf, size_t len)
{
char *action;
struct stat s;
*buf = '\0';
action = strsep(&data, ",");
if (stat(data, &s)) {
return -1;
} else {
switch (*action) {
case 'e':
strcpy(buf, "1");
break;
case 's':
snprintf(buf, len, "%d", (unsigned int) s.st_size);
break;
case 'f':
snprintf(buf, len, "%d", S_ISREG(s.st_mode) ? 1 : 0);
break;
case 'd':
snprintf(buf, len, "%d", S_ISDIR(s.st_mode) ? 1 : 0);
break;
case 'M':
snprintf(buf, len, "%d", (int) s.st_mtime);
break;
case 'A':
snprintf(buf, len, "%d", (int) s.st_mtime);
break;
case 'C':
snprintf(buf, len, "%d", (int) s.st_ctime);
break;
case 'm':
snprintf(buf, len, "%o", (int) s.st_mode);
break;
}
}
return 0;
}
static int file_read(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
{
AST_DECLARE_APP_ARGS(args,
AST_APP_ARG(filename);
AST_APP_ARG(offset);
AST_APP_ARG(length);
);
int offset = 0, length;
char *contents;
AST_STANDARD_APP_ARGS(args, data);
if (args.argc > 1)
offset = atoi(args.offset);
if (args.argc > 2) {
if ((length = atoi(args.length)) < 1) {
ast_log(LOG_WARNING, "Invalid length '%s'. Returning the max (%d)\n", args.length, (int)len);
length = len;
} else if (length > len) {
ast_log(LOG_WARNING, "Length %d is greater than the max (%d). Truncating output.\n", length, (int)len);
length = len;
}
} else
length = len;
if (!(contents = ast_read_textfile(args.filename)))
return -1;
if (offset >= 0)
ast_copy_string(buf, &contents[offset], length);
else {
size_t tmp = strlen(contents);
if (offset * -1 > tmp) {
ast_log(LOG_WARNING, "Offset is larger than the file size.\n");
offset = tmp * -1;
}
ast_copy_string(buf, &contents[tmp + offset], length);
}
ast_free(contents);
return 0;
}
static struct ast_custom_function env_function = {
.name = "ENV",
.synopsis = "Gets or sets the environment variable specified",
.syntax = "ENV(<envname>)",
.read = env_read,
.write = env_write,
};
static struct ast_custom_function stat_function = {
.name = "STAT",
.synopsis = "Does a check on the specified file",
.syntax = "STAT(<flag>,<filename>)",
.read = stat_read,
.desc =
"flag may be one of the following:\n"
" d - Checks if the file is a directory\n"
" e - Checks if the file exists\n"
" f - Checks if the file is a regular file\n"
" m - Returns the file mode (in octal)\n"
" s - Returns the size (in bytes) of the file\n"
" A - Returns the epoch at which the file was last accessed\n"
" C - Returns the epoch at which the inode was last changed\n"
" M - Returns the epoch at which the file was last modified\n",
};
static struct ast_custom_function file_function = {
.name = "FILE",
.synopsis = "Obtains the contents of a file",
.syntax = "FILE(<filename>,<offset>,<length>)",
.read = file_read,
/*
* Some enterprising programmer could probably add write functionality
* to FILE(), although I'm not sure how useful it would be. Hence why
* it's called FILE and not READFILE (like the app was).
*/
.desc =
"<offset> may be specified as any number. If negative, <offset> specifies\n"
" the number of bytes back from the end of the file.\n"
"<length>, if specified, will limit the length of the data read to that size.\n",
};
static int unload_module(void)
{
int res = 0;
res |= ast_custom_function_unregister(&env_function);
res |= ast_custom_function_unregister(&stat_function);
res |= ast_custom_function_unregister(&file_function);
return res;
}
static int load_module(void)
{
int res = 0;
res |= ast_custom_function_register(&env_function);
res |= ast_custom_function_register(&stat_function);
res |= ast_custom_function_register(&file_function);
return res;
}
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Environment/filesystem dialplan functions");
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