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/***************************************************************************
* *
* copyright (C) 2004 by Michael Buesch *
* email: mbuesch@freenet.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License version 2 *
* as published by the Free Software Foundation. *
* *
***************************************************************************/
/***************************************************************************
* copyright (C) 2004 by Ulf Schenk
* This file is originaly based on version 1.0.1 of pwmanager
* and was modified to run on embedded devices that run microkde
*
* $Id$
**************************************************************************/
#include "genpasswd.h"
#include "pwmexception.h"
#include "randomizer.h"
/* how often can a char of the same charset be reused in order */
#define FILTER_MAX_CHARSET_REUSE 3
/* re-randomize all charsets on every iteration (0/1) */
#define RERAND_CHARSET 0
struct staticCharsetStruct
{
const char *lower;
const char *upper;
const char *num;
const char *special;
const char *blank;
};
static struct staticCharsetStruct staticCharset = {
"abcdefghijklmnopqrstuvwxyz",
"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
"0123456789",
"!\"§$%&/()=?,.-;:_+",
" "
};
GenPasswd::GenPasswd()
: length (8)
, useFilter (true)
{
dynCharset.setAutoDelete(true);
}
void GenPasswd::setCharset(bool lower,
bool upper,
bool num,
bool special,
bool blank,
QString user)
{
unsigned int sanityCheck = 0;
dynCharset_element *tmpElement;
dynCharset.clear();
if (lower) {
tmpElement = new dynCharset_element;
tmpElement->refCnt = 0;
tmpElement->data = staticCharset.lower;
dynCharset.append(tmpElement);
++sanityCheck;
}
if (upper) {
tmpElement = new dynCharset_element;
tmpElement->refCnt = 0;
tmpElement->data = staticCharset.upper;
dynCharset.append(tmpElement);
++sanityCheck;
}
if (num) {
tmpElement = new dynCharset_element;
tmpElement->refCnt = 0;
tmpElement->data = staticCharset.num;
dynCharset.append(tmpElement);
++sanityCheck;
}
if (special) {
tmpElement = new dynCharset_element;
tmpElement->refCnt = 0;
tmpElement->data = staticCharset.special;
dynCharset.append(tmpElement);
++sanityCheck;
}
if (blank) {
tmpElement = new dynCharset_element;
tmpElement->refCnt = 0;
tmpElement->data = staticCharset.blank;
dynCharset.append(tmpElement);
}
if (!user.isEmpty()) {
tmpElement = new dynCharset_element;
tmpElement->refCnt = 0;
tmpElement->data = user;
dynCharset.append(tmpElement);
if (likely(user.length() >= 2))
++sanityCheck;
}
BUG_ON(!sanityCheck);
rndDynCharset();
}
void GenPasswd::rndDynCharset()
{
QString tmpData;
int pos;
Randomizer *rnd = Randomizer::obj();
// QPtrList<dynCharset_element>::iterator is not available in QT-3.1
unsigned int i, cnt = dynCharset.count();
dynCharset_element *p;
for (i = 0; i < cnt; ++i) {
p = dynCharset.at(i);
PWM_ASSERT(p);
tmpData = QString::null;
while (p->data.length()) {
pos = rnd->genRndInt() % p->data.length();
tmpData.append(p->data.at(pos));
p->data.remove(pos, 1);
}
p->data = tmpData;
}
}
QString GenPasswd::gen()
{
BUG_ON(dynCharset.count() <= 0);
BUG_ON(length < 1);
dynCharset_element *curCharset;
QString ret;
int i;
for (i = 0; i < length; ++i) {
curCharset = selectNextCharset();
#if RERAND_CHARSET != 0
rndDynCharset();
#endif // RERAND_CHARSET
ret += genNewRandom(curCharset);
}
return ret;
}
GenPasswd::dynCharset_element * GenPasswd::selectNextCharset()
{
dynCharset_element *ret;
int numCharsets = dynCharset.count();
BUG_ON(numCharsets <= 0);
if (numCharsets == 1)
return dynCharset.at(0);
Randomizer *rnd = Randomizer::obj();
if (useFilter) {
// find out which charsets are allowed (filtering)
QPtrList<dynCharset_element> allowedCharsets;
// QPtrList<dynCharset_element>::iterator is not available in QT-3.1
unsigned int i, cnt = dynCharset.count();
dynCharset_element *p;
for (i = 0; i < cnt; ++i) {
p = dynCharset.at(i);
PWM_ASSERT(p);
if (p->refCnt < FILTER_MAX_CHARSET_REUSE) {
allowedCharsets.append(p);
} else {
p->refCnt = 0;
}
}
int numAllowedCharsets = allowedCharsets.count();
BUG_ON(numAllowedCharsets <= 0);
// now get a random charset out of the allowed
unsigned int randomPos = rnd->genRndUInt() % numAllowedCharsets;
ret = allowedCharsets.at(randomPos);
ret->refCnt++;
return ret;
}
// all charsets are allowed here (no filtering). Get a random.
unsigned int randomPos = rnd->genRndUInt() % numCharsets;
ret = dynCharset.at(randomPos);
return ret;
}
QChar GenPasswd::genNewRandom(const dynCharset_element *charset)
{
Randomizer *rnd = Randomizer::obj();
int pos = rnd->genRndInt() % charset->data.length();
return charset->data.at(pos);
}
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