Fri Jun 19 12:09:45 2009

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  * \ingroup functions
00025  */
00026 
00027 #include "asterisk.h"
00028 
00029 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 89521 $")
00030 
00031 #include "asterisk/module.h"
00032 #include "asterisk/pbx.h"
00033 
00034 static int sha1(struct ast_channel *chan, const char *cmd, char *data,
00035       char *buf, size_t len)
00036 {
00037    *buf = '\0';
00038 
00039    if (ast_strlen_zero(data)) {
00040       ast_log(LOG_WARNING, "Syntax: SHA1(<data>) - missing argument!\n");
00041       return -1;
00042    }
00043 
00044    if (len >= 41)
00045       ast_sha1_hash(buf, data);
00046    else {
00047       ast_log(LOG_ERROR,
00048             "Insufficient space to produce SHA1 hash result (%d < 41)\n",
00049             (int) len);
00050    }
00051 
00052    return 0;
00053 }
00054 
00055 static struct ast_custom_function sha1_function = {
00056    .name = "SHA1",
00057    .synopsis = "Computes a SHA1 digest",
00058    .syntax = "SHA1(<data>)",
00059    .read = sha1,
00060    .desc = "Generate a SHA1 digest via the SHA1 algorythm.\n"
00061       " Example:  Set(sha1hash=${SHA1(junky)})\n"
00062       " Sets the asterisk variable sha1hash to the string '60fa5675b9303eb62f99a9cd47f9f5837d18f9a0'\n"
00063       " which is known as his hash\n",
00064 };
00065 
00066 static int unload_module(void)
00067 {
00068    return ast_custom_function_unregister(&sha1_function);
00069 }
00070 
00071 static int load_module(void)
00072 {
00073    return ast_custom_function_register(&sha1_function);
00074 }
00075 
00076 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "SHA-1 computation dialplan function");

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