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 /*** MODULEINFO
00028    <support_level>core</support_level>
00029  ***/
00030 
00031 #include "asterisk.h"
00032 
00033 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 328259 $")
00034 
00035 #include "asterisk/module.h"
00036 #include "asterisk/pbx.h"
00037 
00038 /*** DOCUMENTATION
00039    <function name="SHA1" language="en_US">
00040       <synopsis>
00041          Computes a SHA1 digest.
00042       </synopsis>
00043       <syntax>
00044          <parameter name="data" required="true">
00045             <para>Input string</para>
00046          </parameter>
00047       </syntax>
00048       <description>
00049          <para>Generate a SHA1 digest via the SHA1 algorythm.</para>
00050          <para>Example:  Set(sha1hash=${SHA1(junky)})</para>
00051          <para>Sets the asterisk variable sha1hash to the string <literal>60fa5675b9303eb62f99a9cd47f9f5837d18f9a0</literal>
00052          which is known as his hash</para>   
00053       </description>
00054    </function>
00055  ***/
00056 
00057 static int sha1(struct ast_channel *chan, const char *cmd, char *data,
00058       char *buf, size_t len)
00059 {
00060    *buf = '\0';
00061 
00062    if (ast_strlen_zero(data)) {
00063       ast_log(LOG_WARNING, "Syntax: SHA1(<data>) - missing argument!\n");
00064       return -1;
00065    }
00066 
00067    if (len >= 41)
00068       ast_sha1_hash(buf, data);
00069    else {
00070       ast_log(LOG_ERROR,
00071             "Insufficient space to produce SHA1 hash result (%d < 41)\n",
00072             (int) len);
00073    }
00074 
00075    return 0;
00076 }
00077 
00078 static struct ast_custom_function sha1_function = {
00079    .name = "SHA1",
00080    .read = sha1,
00081    .read_max = 42,
00082 };
00083 
00084 static int unload_module(void)
00085 {
00086    return ast_custom_function_unregister(&sha1_function);
00087 }
00088 
00089 static int load_module(void)
00090 {
00091    return ast_custom_function_register(&sha1_function);
00092 }
00093 
00094 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "SHA-1 computation dialplan function");

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