Mon May 14 04:42:58 2007

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__, "$Revision$")
00030 
00031 #include <stdio.h>
00032 #include <stdlib.h>
00033 #include <string.h>
00034 #include <sys/types.h>
00035 
00036 #include "asterisk/module.h"
00037 #include "asterisk/channel.h"
00038 #include "asterisk/pbx.h"
00039 #include "asterisk/logger.h"
00040 #include "asterisk/utils.h"
00041 #include "asterisk/app.h"
00042 
00043 static int sha1(struct ast_channel *chan, char *cmd, char *data,
00044       char *buf, size_t len)
00045 {
00046    *buf = '\0';
00047 
00048    if (ast_strlen_zero(data)) {
00049       ast_log(LOG_WARNING, "Syntax: SHA1(<data>) - missing argument!\n");
00050       return -1;
00051    }
00052 
00053    if (len >= 41)
00054       ast_sha1_hash(buf, data);
00055    else {
00056       ast_log(LOG_ERROR,
00057             "Insufficient space to produce SHA1 hash result (%d < 41)\n",
00058             (int) len);
00059    }
00060 
00061    return 0;
00062 }
00063 
00064 static struct ast_custom_function sha1_function = {
00065    .name = "SHA1",
00066    .synopsis = "Computes a SHA1 digest",
00067    .syntax = "SHA1(<data>)",
00068    .read = sha1,
00069    .desc = "Generate a SHA1 digest via the SHA1 algorythm.\n"
00070       " Example:  Set(sha1hash=${SHA1(junky)})\n"
00071       " Sets the asterisk variable sha1hash to the string '60fa5675b9303eb62f99a9cd47f9f5837d18f9a0'\n"
00072       " which is known as his hash\n",
00073 };
00074 
00075 static int unload_module(void)
00076 {
00077    return ast_custom_function_unregister(&sha1_function);
00078 }
00079 
00080 static int load_module(void)
00081 {
00082    return ast_custom_function_register(&sha1_function);
00083 }
00084 
00085 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "SHA-1 computation dialplan function");

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