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/*
* Asterisk -- A telephony toolkit for Linux.
*
* MD5 checksum application
*
* Copyright (C) 2005, Olle E. Johansson, Edvina.net
*
* This program is free software, distributed under the terms of
* the GNU General Public License
*/
#include <asterisk/file.h>
#include <asterisk/logger.h>
#include <asterisk/utils.h>
#include <asterisk/options.h>
#include <asterisk/channel.h>
#include <asterisk/pbx.h>
#include <asterisk/module.h>
#include <asterisk/lock.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
static char *tdesc_md5 = "MD5 checksum applications";
static char *app_md5 = "MD5";
static char *desc_md5 = "Calculate MD5 checksum";
static char *synopsis_md5 =
" MD5(<var>=<string>): Calculates a MD5 checksum on <string>.\n"
"Returns hash value in a channel variable. Always return 0\n";
static char *app_md5check = "MD5Check";
static char *desc_md5check = "Check MD5 checksum";
static char *synopsis_md5check =
" MD5Check(<md5hash>,<string>): Calculates a MD5 checksum on <string>\n"
"and compares it with the hash. Returns 0 if <md5hash> is correct for <string>.\n"
"Jumps to priority+101 if incorrect.\n";
STANDARD_LOCAL_USER;
LOCAL_USER_DECL;
/*--- md5_exec: Calculate MD5 checksum (hash) on given string and
return it in channel variable ---*/
static int md5_exec(struct ast_channel *chan, void *data)
{
int res=0;
struct localuser *u;
char *varname= NULL; /* Variable to set */
char *string = NULL; /* String to calculate on */
char retvar[50]; /* Return value */
if (!data) {
ast_log(LOG_WARNING, "Syntax: md5(<varname>=<string>) - missing argument!\n");
return -1;
}
LOCAL_USER_ADD(u);
memset(retvar,0, sizeof(retvar));
string = ast_strdupa(data);
varname = strsep(&string,"=");
if (ast_strlen_zero(varname)) {
ast_log(LOG_WARNING, "Syntax: md5(<varname>=<string>) - missing argument!\n");
LOCAL_USER_REMOVE(u);
return -1;
}
ast_md5_hash(retvar, string);
pbx_builtin_setvar_helper(chan, varname, retvar);
LOCAL_USER_REMOVE(u);
return res;
}
/*--- md5check_exec: Calculate MD5 checksum and compare it with
existing checksum. ---*/
static int md5check_exec(struct ast_channel *chan, void *data)
{
int res=0;
struct localuser *u;
char *hash= NULL; /* Hash to compare with */
char *string = NULL; /* String to calculate on */
char newhash[50]; /* Return value */
if (!data) {
ast_log(LOG_WARNING, "Syntax: MD5Check(<md5hash>,<string>) - missing argument!\n");
return -1;
}
LOCAL_USER_ADD(u);
memset(newhash,0, sizeof(newhash));
string = ast_strdupa(data);
hash = strsep(&string,"|");
if (ast_strlen_zero(hash)) {
ast_log(LOG_WARNING, "Syntax: MD5Check(<md5hash>,<string>) - missing argument!\n");
LOCAL_USER_REMOVE(u);
return -1;
}
ast_md5_hash(newhash, string);
if (!strcmp(newhash, hash)) { /* Verification ok */
if (option_debug > 2)
ast_log(LOG_DEBUG, "MD5 verified ok: %s -- %s\n", hash, string);
LOCAL_USER_REMOVE(u);
return 0;
}
if (option_debug > 2)
ast_log(LOG_DEBUG, "ERROR: MD5 not verified: %s -- %s\n", hash, string);
if (ast_exists_extension(chan, chan->context, chan->exten, chan->priority + 101, chan->cid.cid_num))
chan->priority += 100;
else if (option_debug > 2)
ast_log(LOG_DEBUG, "ERROR: Can't jump to exten+101 (e%s,p%d), sorry\n", chan->exten,chan->priority+101);
LOCAL_USER_REMOVE(u);
return res;
}
int unload_module(void)
{
int res;
STANDARD_HANGUP_LOCALUSERS;
res =ast_unregister_application(app_md5);
res |= ast_unregister_application(app_md5check);
return res;
}
int load_module(void)
{
int res;
res = ast_register_application(app_md5check, md5check_exec, desc_md5check, synopsis_md5check);
res |= ast_register_application(app_md5, md5_exec, desc_md5, synopsis_md5);
return res;
}
char *description(void)
{
return tdesc_md5;
}
int usecount(void)
{
int res;
STANDARD_USECOUNT(res);
return res;
}
char *key()
{
return ASTERISK_GPL_KEY;
}
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