Fri Aug 24 02:22:15 2007

Asterisk developer's documentation


func_env.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2006, Digium, Inc.
00005  *
00006  * See http://www.asterisk.org for more information about
00007  * the Asterisk project. Please do not directly contact
00008  * any of the maintainers of this project for assistance;
00009  * the project provides a web site, mailing lists and IRC
00010  * channels for your use.
00011  *
00012  * This program is free software, distributed under the terms of
00013  * the GNU General Public License Version 2. See the LICENSE file
00014  * at the top of the source tree.
00015  */
00016 
00017 /*! \file
00018  *
00019  * \brief Environment related dialplan functions
00020  * 
00021  * \ingroup functions
00022  */
00023 
00024 #include "asterisk.h"
00025 
00026 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
00027 
00028 #include <stdio.h>
00029 #include <stdlib.h>
00030 #include <string.h>
00031 #include <sys/types.h>
00032 #include <sys/stat.h>
00033 
00034 #include "asterisk/module.h"
00035 #include "asterisk/channel.h"
00036 #include "asterisk/pbx.h"
00037 #include "asterisk/logger.h"
00038 #include "asterisk/utils.h"
00039 #include "asterisk/app.h"
00040 
00041 static int env_read(struct ast_channel *chan, char *cmd, char *data,
00042           char *buf, size_t len)
00043 {
00044    char *ret = NULL;
00045 
00046    *buf = '\0';
00047 
00048    if (data)
00049       ret = getenv(data);
00050 
00051    if (ret)
00052       ast_copy_string(buf, ret, len);
00053 
00054    return 0;
00055 }
00056 
00057 static int env_write(struct ast_channel *chan, char *cmd, char *data,
00058            const char *value)
00059 {
00060    if (!ast_strlen_zero(data)) {
00061       if (!ast_strlen_zero(value)) {
00062          setenv(data, value, 1);
00063       } else {
00064          unsetenv(data);
00065       }
00066    }
00067 
00068    return 0;
00069 }
00070 
00071 static int stat_read(struct ast_channel *chan, char *cmd, char *data,
00072            char *buf, size_t len)
00073 {
00074    char *action;
00075    struct stat s;
00076 
00077    *buf = '\0';
00078 
00079    action = strsep(&data, "|");
00080    if (stat(data, &s)) {
00081       return -1;
00082    } else {
00083       switch (*action) {
00084       case 'e':
00085          strcpy(buf, "1");
00086          break;
00087       case 's':
00088          snprintf(buf, len, "%d", (unsigned int) s.st_size);
00089          break;
00090       case 'f':
00091          snprintf(buf, len, "%d", S_ISREG(s.st_mode) ? 1 : 0);
00092          break;
00093       case 'd':
00094          snprintf(buf, len, "%d", S_ISDIR(s.st_mode) ? 1 : 0);
00095          break;
00096       case 'M':
00097          snprintf(buf, len, "%d", (int) s.st_mtime);
00098          break;
00099       case 'A':
00100          snprintf(buf, len, "%d", (int) s.st_mtime);
00101          break;
00102       case 'C':
00103          snprintf(buf, len, "%d", (int) s.st_ctime);
00104          break;
00105       case 'm':
00106          snprintf(buf, len, "%o", (int) s.st_mode);
00107          break;
00108       }
00109    }
00110 
00111    return 0;
00112 }
00113 
00114 static struct ast_custom_function env_function = {
00115    .name = "ENV",
00116    .synopsis = "Gets or sets the environment variable specified",
00117    .syntax = "ENV(<envname>)",
00118    .read = env_read,
00119    .write = env_write,
00120 };
00121 
00122 static struct ast_custom_function stat_function = {
00123    .name = "STAT",
00124    .synopsis = "Does a check on the specified file",
00125    .syntax = "STAT(<flag>,<filename>)",
00126    .read = stat_read,
00127    .desc =
00128       "flag may be one of the following:\n"
00129       "  d - Checks if the file is a directory\n"
00130       "  e - Checks if the file exists\n"
00131       "  f - Checks if the file is a regular file\n"
00132       "  m - Returns the file mode (in octal)\n"
00133       "  s - Returns the size (in bytes) of the file\n"
00134       "  A - Returns the epoch at which the file was last accessed\n"
00135       "  C - Returns the epoch at which the inode was last changed\n"
00136       "  M - Returns the epoch at which the file was last modified\n",
00137 };
00138 
00139 static int unload_module(void)
00140 {
00141    int res = 0;
00142 
00143    res |= ast_custom_function_unregister(&env_function);
00144    res |= ast_custom_function_unregister(&stat_function);
00145 
00146    return res;
00147 }
00148 
00149 static int load_module(void)
00150 {
00151    int res = 0;
00152 
00153    res |= ast_custom_function_register(&env_function);
00154    res |= ast_custom_function_register(&stat_function);
00155 
00156    return res;
00157 }
00158 
00159 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Environment/filesystem dialplan functions");

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