#!/usr/bin/perl

use strict;
use warnings;

print mkpasswd({
        minlen => 8,
        maxlen => 10,
        lower => 1,
        special => 1,
        upper => 1,
        digit => 1,
});
        

sub mkpasswd {
	my($param)= @_;
	if( not ref $param ) {
		$param= {
			minlen => $param,
			maxlen => $param,
		};
	}
	if( ref $param eq 'HASH' ) {
		$param->{minlen}||= 8;
		$param->{maxlen}||= $param->{minlen} + 2;
	}
	my ( @l, @u, @n, @s, @p);

	open( URANDOM, "</dev/urandom" ) || die $!;
	read( URANDOM, $_, 4 );
	close URANDOM;
	srand( unpack( "L", $_ ) );

	@l = ( "a" .. "z" );
	@u = ( "A" .. "Z" );
	@n = ( 0 .. 9 );
	@s = (
	    '#', ',', ' ',
	    qw# ! " $ % & ' ( ) * +  - . / : ; < = > ? @ [ \ ] ^ _ ` { | } ~ #
	);

    push( @p, $l[rand(@l)] ) for ( 1 .. $param->{lower} );
    push( @p, $u[rand(@u)] ) for ( 1 .. $param->{upper} );
    push( @p, $n[rand(@n)] ) for ( 1 .. $param->{digit} );
    push( @p, $s[rand(@s)] ) for ( 1 .. $param->{special} );
    my $m = $param->{minlen} - @p;
    $m=0 if $m<0;
    my $x = $param->{maxlen} - @p - $m + 1;
    $x=0 if $x<0;
    my(@j)= ( @l, @u, @s, @n );
    $x= $m + rand($x);
    push( @p, $j[rand(@j)] ) for ( 1 .. $x );
    

    for ( my $i = @p ; --$i ; ) {
        my $j = int( rand( $i + 1 ) );
        next if $i == $j;
        @p[ $i, $j ] = @p[ $j, $i ];
    }

    return join( "", @p );

}