Sat Aug 6 00:39:29 2011

Asterisk developer's documentation


func_sha1.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 2006, Digium, Inc.
00005  * Copyright (C) 2006, Claude Patry
00006  *
00007  * See http://www.asterisk.org for more information about
00008  * the Asterisk project. Please do not directly contact
00009  * any of the maintainers of this project for assistance;
00010  * the project provides a web site, mailing lists and IRC
00011  * channels for your use.
00012  *
00013  * This program is free software, distributed under the terms of
00014  * the GNU General Public License Version 2. See the LICENSE file
00015  * at the top of the source tree.
00016  */
00017 
00018 /*! \file
00019  *
00020  * \brief SHA1 digest related dialplan functions
00021  * 
00022  * \author Claude Patry <cpatry@gmail.com>
00023  */
00024 
00025 #include "asterisk.h"
00026 
00027 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 40722 $")
00028 
00029 #include <stdio.h>
00030 #include <stdlib.h>
00031 #include <string.h>
00032 #include <sys/types.h>
00033 
00034 #include "asterisk/module.h"
00035 #include "asterisk/channel.h"
00036 #include "asterisk/pbx.h"
00037 #include "asterisk/logger.h"
00038 #include "asterisk/utils.h"
00039 #include "asterisk/app.h"
00040 
00041 static int sha1(struct ast_channel *chan, char *cmd, char *data,
00042       char *buf, size_t len)
00043 {
00044    *buf = '\0';
00045 
00046    if (ast_strlen_zero(data)) {
00047       ast_log(LOG_WARNING, "Syntax: SHA1(<data>) - missing argument!\n");
00048       return -1;
00049    }
00050 
00051    if (len >= 41)
00052       ast_sha1_hash(buf, data);
00053    else {
00054       ast_log(LOG_ERROR,
00055             "Insufficient space to produce SHA1 hash result (%d < 41)\n",
00056             (int) len);
00057    }
00058 
00059    return 0;
00060 }
00061 
00062 static struct ast_custom_function sha1_function = {
00063    .name = "SHA1",
00064    .synopsis = "Computes a SHA1 digest",
00065    .syntax = "SHA1(<data>)",
00066    .read = sha1,
00067    .desc = "Generate a SHA1 digest via the SHA1 algorythm.\n"
00068       " Example:  Set(sha1hash=${SHA1(junky)})\n"
00069       " Sets the asterisk variable sha1hash to the string '60fa5675b9303eb62f99a9cd47f9f5837d18f9a0'\n"
00070       " which is known as his hash\n",
00071 };
00072 
00073 static int unload_module(void)
00074 {
00075    return ast_custom_function_unregister(&sha1_function);
00076 }
00077 
00078 static int load_module(void)
00079 {
00080    return ast_custom_function_register(&sha1_function);
00081 }
00082 
00083 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "SHA-1 computation dialplan function");

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