270 lines
6.4 KiB
C
270 lines
6.4 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2006, Digium, Inc.
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Environment related dialplan functions
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*
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* \ingroup functions
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include <sys/stat.h>
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#include "asterisk/module.h"
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#include "asterisk/channel.h"
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#include "asterisk/pbx.h"
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#include "asterisk/utils.h"
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#include "asterisk/app.h"
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/*** DOCUMENTATION
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<function name="ENV" language="en_US">
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<synopsis>
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Gets or sets the environment variable specified.
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</synopsis>
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<syntax>
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<parameter name="varname" required="true">
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<para>Environment variable name</para>
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</parameter>
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</syntax>
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<description>
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</description>
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</function>
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<function name="STAT" language="en_US">
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<synopsis>
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Does a check on the specified file.
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</synopsis>
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<syntax>
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<parameter name="flag" required="true">
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<para>Flag may be one of the following:</para>
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<para>d - Checks if the file is a directory.</para>
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<para>e - Checks if the file exists.</para>
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<para>f - Checks if the file is a regular file.</para>
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<para>m - Returns the file mode (in octal)</para>
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<para>s - Returns the size (in bytes) of the file</para>
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<para>A - Returns the epoch at which the file was last accessed.</para>
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<para>C - Returns the epoch at which the inode was last changed.</para>
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<para>M - Returns the epoch at which the file was last modified.</para>
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</parameter>
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<parameter name="filename" required="true" />
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</syntax>
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<description>
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</description>
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</function>
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<function name="FILE" language="en_US">
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<synopsis>
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Obtains the contents of a file.
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</synopsis>
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<syntax>
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<parameter name="filename" required="true" />
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<parameter name="offset" required="true">
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<para>Maybe specified as any number. If negative, <replaceable>offset</replaceable> specifies the number
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of bytes back from the end of the file.</para>
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</parameter>
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<parameter name="length" required="true">
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<para>If specified, will limit the length of the data read to that size. If negative,
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trims <replaceable>length</replaceable> bytes from the end of the file.</para>
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</parameter>
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</syntax>
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<description>
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</description>
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</function>
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***/
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static int env_read(struct ast_channel *chan, const char *cmd, char *data,
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char *buf, size_t len)
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{
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char *ret = NULL;
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*buf = '\0';
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if (data)
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ret = getenv(data);
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if (ret)
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ast_copy_string(buf, ret, len);
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return 0;
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}
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static int env_write(struct ast_channel *chan, const char *cmd, char *data,
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const char *value)
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{
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if (!ast_strlen_zero(data)) {
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if (!ast_strlen_zero(value)) {
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setenv(data, value, 1);
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} else {
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unsetenv(data);
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}
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}
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return 0;
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}
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static int stat_read(struct ast_channel *chan, const char *cmd, char *data,
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char *buf, size_t len)
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{
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char *action;
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struct stat s;
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ast_copy_string(buf, "0", len);
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action = strsep(&data, ",");
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if (stat(data, &s)) {
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return 0;
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} else {
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switch (*action) {
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case 'e':
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strcpy(buf, "1");
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break;
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case 's':
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snprintf(buf, len, "%d", (unsigned int) s.st_size);
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break;
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case 'f':
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snprintf(buf, len, "%d", S_ISREG(s.st_mode) ? 1 : 0);
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break;
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case 'd':
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snprintf(buf, len, "%d", S_ISDIR(s.st_mode) ? 1 : 0);
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break;
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case 'M':
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snprintf(buf, len, "%d", (int) s.st_mtime);
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break;
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case 'A':
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snprintf(buf, len, "%d", (int) s.st_mtime);
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break;
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case 'C':
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snprintf(buf, len, "%d", (int) s.st_ctime);
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break;
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case 'm':
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snprintf(buf, len, "%o", (int) s.st_mode);
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break;
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}
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}
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return 0;
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}
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static int file_read(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
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{
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AST_DECLARE_APP_ARGS(args,
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AST_APP_ARG(filename);
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AST_APP_ARG(offset);
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AST_APP_ARG(length);
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);
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int offset = 0, length, res = 0;
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char *contents;
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size_t contents_len;
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AST_STANDARD_APP_ARGS(args, data);
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if (args.argc > 1) {
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offset = atoi(args.offset);
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}
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if (args.argc > 2) {
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/* The +1/-1 in this code section is to accomodate for the terminating NULL. */
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if ((length = atoi(args.length) + 1) > len) {
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ast_log(LOG_WARNING, "Length %d is greater than the max (%d). Truncating output.\n", length - 1, (int)len - 1);
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length = len;
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}
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} else {
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length = len;
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}
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if (!(contents = ast_read_textfile(args.filename))) {
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return -1;
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}
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do {
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contents_len = strlen(contents);
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if (offset > contents_len) {
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res = -1;
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break;
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}
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if (offset >= 0) {
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if (length < 0) {
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if (contents_len - offset + length < 0) {
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/* Nothing left after trimming */
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res = -1;
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break;
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}
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ast_copy_string(buf, &contents[offset], contents_len + length);
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} else {
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ast_copy_string(buf, &contents[offset], length);
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}
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} else {
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if (offset * -1 > contents_len) {
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ast_log(LOG_WARNING, "Offset is larger than the file size.\n");
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offset = contents_len * -1;
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}
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ast_copy_string(buf, &contents[contents_len + offset], length);
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}
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} while (0);
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ast_free(contents);
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return res;
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}
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static struct ast_custom_function env_function = {
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.name = "ENV",
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.read = env_read,
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.write = env_write
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};
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static struct ast_custom_function stat_function = {
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.name = "STAT",
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.read = stat_read,
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.read_max = 12,
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};
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static struct ast_custom_function file_function = {
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.name = "FILE",
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.read = file_read
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/*
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* Some enterprising programmer could probably add write functionality
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* to FILE(), although I'm not sure how useful it would be. Hence why
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* it's called FILE and not READFILE (like the app was).
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*/
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};
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static int unload_module(void)
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{
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int res = 0;
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res |= ast_custom_function_unregister(&env_function);
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res |= ast_custom_function_unregister(&stat_function);
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res |= ast_custom_function_unregister(&file_function);
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return res;
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}
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static int load_module(void)
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{
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int res = 0;
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res |= ast_custom_function_register(&env_function);
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res |= ast_custom_function_register(&stat_function);
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res |= ast_custom_function_register(&file_function);
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return res;
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Environment/filesystem dialplan functions");
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