funcs/func_md5.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 2005-2006, Digium, Inc.
   5  * Copyright (C) 2005, Olle E. Johansson, Edvina.net
   6  * Copyright (C) 2005, Russell Bryant <russelb@clemson.edu>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  *
  21  * \brief MD5 digest related dialplan functions
  22  *
  23  * \author Olle E. Johansson <oej@edvina.net>
  24  * \author Russell Bryant <russelb@clemson.edu>
  25  */
  26
  27 #include "asterisk.h"
  28
  29 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <sys/types.h>
  35
  36 #include "asterisk/module.h"
  37 #include "asterisk/channel.h"
  38 #include "asterisk/pbx.h"
  39 #include "asterisk/logger.h"
  40 #include "asterisk/utils.h"
  41 #include "asterisk/app.h"
  42
  43 static int md5(struct ast_channel *chan, char *cmd, char *data,
  44                char *buf, size_t len)
  45 {
  46         if (ast_strlen_zero(data)) {
  47                 ast_log(LOG_WARNING, "Syntax: MD5(<data>) - missing argument!\n");
  48                 return -1;
  49         }
  50
  51         ast_md5_hash(buf, data);
  52         buf[32] = '\0';
  53
  54         return 0;
  55 }
  56
  57 static int checkmd5(struct ast_channel *chan, char *cmd, char *parse,
  58                     char *buf, size_t len)
  59 {
  60         char newmd5[33];
  61         static int deprecated = 0;
  62         AST_DECLARE_APP_ARGS(args, AST_APP_ARG(digest); AST_APP_ARG(data););
  63
  64         if (ast_strlen_zero(parse)) {
  65                 ast_log(LOG_WARNING,
  66                                 "Syntax: CHECK_MD5(<digest>,<data>) - missing argument!\n");
  67                 return -1;
  68         }
  69
  70         AST_STANDARD_APP_ARGS(args, parse);
  71
  72         if (args.argc < 2) {
  73                 ast_log(LOG_WARNING,
  74                                 "Syntax: CHECK_MD5(<digest>,<data>) - missing argument!\n");
  75                 return -1;
  76         }
  77
  78         if (!deprecated) {
  79                 deprecated = 1;
  80                 ast_log(LOG_WARNING, "CHECK_MD5() is deprecated in Asterisk 1.4 and later.\n");
  81         }
  82
  83         ast_md5_hash(newmd5, args.data);
  84
  85         if (!strcasecmp(newmd5, args.digest))   /* they match */
  86                 ast_copy_string(buf, "1", len);
  87         else
  88                 ast_copy_string(buf, "0", len);
  89
  90         return 0;
  91 }
  92
  93 static struct ast_custom_function md5_function = {
  94         .name = "MD5",
  95         .synopsis = "Computes an MD5 digest",
  96         .syntax = "MD5(<data>)",
  97         .read = md5,
  98 };
  99
 100 static struct ast_custom_function checkmd5_function = {
 101         .name = "CHECK_MD5",
 102         .synopsis = "Checks an MD5 digest",
 103         .desc = "Returns 1 on a match, 0 otherwise\n",
 104         .syntax = "CHECK_MD5(<digest>,<data>)",
 105         .read = checkmd5,
 106 };
 107
 108 static int unload_module(void)
 109 {
 110         return ast_custom_function_unregister(&md5_function) |
 111                 ast_custom_function_unregister(&checkmd5_function);
 112 }
 113
 114 static int load_module(void)
 115 {
 116         return ast_custom_function_register(&md5_function) |
 117                 ast_custom_function_register(&checkmd5_function);
 118 }
 119
 120 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "MD5 digest dialplan functions");