Asterisk.org: Developer Documentation (28 Oct 2009)

Wed Oct 28 15:47:54 2009

## Asterisk developer's documentation

# func_md5.c

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    00001 /*
    00002  * Asterisk -- An open source telephony toolkit.
    00003  *
    00004  * Copyright (C) 2005, Digium, Inc.
    00005  * Copyright (C) 2005, Olle E. Johansson, Edvina.net
    00006  * Copyright (C) 2005, Russell Bryant <russelb@clemson.edu>
    00007  *
    00008  * See http://www.asterisk.org for more information about
    00009  * the Asterisk project. Please do not directly contact
    00010  * any of the maintainers of this project for assistance;
    00011  * the project provides a web site, mailing lists and IRC
    00012  * channels for your use.
    00013  *
    00014  * This program is free software, distributed under the terms of
    00015  * the GNU General Public License Version 2. See the LICENSE file
    00016  * at the top of the source tree.
    00017  */
    00018
    00019 /*! \file
    00020  *
    00021  * \brief MD5 digest related dialplan functions
    00022  *
    00023  */
    00024
    00025 #include <stdlib.h>
    00026 #include <string.h>
    00027 #include <sys/types.h>
    00028
    00029 #include "asterisk.h"
    00030
    00031 /* ASTERISK_FILE_VERSION(__FILE__, "$Revision: 7221 $") */
    00032
    00033 #include "asterisk/channel.h"
    00034 #include "asterisk/pbx.h"
    00035 #include "asterisk/logger.h"
    00036 #include "asterisk/utils.h"
    00037 #include "asterisk/app.h"
    00038
    00039 static char *builtin_function_md5(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
    00040 {
    00041    char md5[33];
    00042
    00043    if (ast_strlen_zero(data)) {
    00044       ast_log(LOG_WARNING, "Syntax: MD5(<data>) - missing argument!\n");
    00045       return NULL;
    00046    }
    00047
    00048    ast_md5_hash(md5, data);
    00049    ast_copy_string(buf, md5, len);
    00050
    00051    return buf;
    00052 }
    00053
    00054 static char *builtin_function_checkmd5(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
    00055 {
    00056    int argc;
    00057    char *argv[2];
    00058    char *args;
    00059    char newmd5[33];
    00060
    00061    if (!data || ast_strlen_zero(data)) {
    00062       ast_log(LOG_WARNING, "Syntax: CHECK_MD5(<digest>,<data>) - missing argument!\n");
    00063       return NULL;
    00064    }
    00065
    00066    args = ast_strdupa(data);
    00067    argc = ast_app_separate_args(args, '|', argv, sizeof(argv) / sizeof(argv[0]));
    00068
    00069    if (argc < 2) {
    00070       ast_log(LOG_WARNING, "Syntax: CHECK_MD5(<digest>,<data>) - missing argument!\n");
    00071       return NULL;
    00072    }
    00073
    00074    ast_md5_hash(newmd5, argv[1]);
    00075
    00076    if (!strcasecmp(newmd5, argv[0]))   /* they match */
    00077       ast_copy_string(buf, "1", len);
    00078    else
    00079       ast_copy_string(buf, "0", len);
    00080
    00081    return buf;
    00082 }
    00083
    00084 #ifndef BUILTIN_FUNC
    00085 static
    00086 #endif
    00087 struct ast_custom_function md5_function = {
    00088    .name = "MD5",
    00089    .synopsis = "Computes an MD5 digest",
    00090    .syntax = "MD5(<data>)",
    00091    .read = builtin_function_md5,
    00092 };
    00093
    00094 #ifndef BUILTIN_FUNC
    00095 static
    00096 #endif
    00097 struct ast_custom_function checkmd5_function = {
    00098    .name = "CHECK_MD5",
    00099    .synopsis = "Checks an MD5 digest",
    00100    .desc = "Returns 1 on a match, 0 otherwise\n",
    00101    .syntax = "CHECK_MD5(<digest>,<data>)",
    00102    .read = builtin_function_checkmd5,
    00103 };