#!/usr/bin/perl

#
# Copyright (c) y2k6, Rafal Lesniak <thorolf@grid.einherjar.de>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#	This product includes software developed by Rafal Lesniak.
# 4. The name of the author may not be used to endorse or promote products
#    derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $Id$
#

use strict;

if (!$ARGV[0]) {print "Usage: $0 </path/to/extracted/db/dir>\n";exit 1;}

my $tmpDir = $ARGV[0];
my @dbFiles = ('daily.db','main.db');

my $db = {};
my $sig = {};

my $now = gmtime(time());

print "
Clamav Virus Database Consistency Check
Date: ". $now ."

[o] F - file
[o] C - current signature/name
[o] O - old signature/name
---------------------------

";

foreach my $f (@dbFiles) {
 my $df = $tmpDir.$f;
 print "[X] Testing [".$df."]\n\n";
 &load_db($df);
};

sub load_db {
 my $path = $_[0];
 open(DB,$path) or die("Can't open $path: $!\n");
 my $c = 0;
 
 while(my $line = <DB>) {
  $c++;
  my $lc = $path.":$c";
  if ($line =~ /^#/) {next;} 
  elsif ($line =~ /\r\n$/) {
   print $lc.": ends with \\r\\n\n";
  } else {
   chomp($line);
   my ($n,$s) = split("=",$line);
    my $os = $s;
    $s =~ s/\?/\\?/g;
   if (defined($db->{$n})) {
    print $lc.": duplicated virus name found\n";
	print "\t[*] C:[$n] F:[".$db->{$n}->{'lc'}."]\n";
	&visCmp($n,$s);
   } else {
	$db->{$n}->{'lc'}=$lc;
	$db->{$n}->{'s'}=$s;
	$db->{$n}->{'os'}=$os;
   }
   if (defined($sig->{$s})){
     print $lc.": duplicated virus signature found\n";
	 print "\t[*] C:[$n] O:[".$sig->{$s}->{'name'}."] F:[".$sig->{$s}->{'lc'}."]\n\n";
	} else {
     $sig->{$s}->{'name'}=$n;
	 $sig->{$s}->{'lc'}=$lc;
	 $sig->{$s}->{'os'}=$os;
	}
  }
 }
 close(DB);
};

sub visCmp {
my $n = $_[0];
my $s = $_[1];

	if ($db->{$n}->{'s'} eq $s) {print "\t[*] both signatures are equal\n";}
	elsif ($db->{$n}->{'s'} =~ /$s/) {
	 print "\t[*] old signature contains this one\n";
	 print "\t[i] Length C:[". length($s)."] O:[".length($db->{$n}->{'s'})."]\n";
	}
	elsif ($s =~ /$db->{$n}->{'s'}/) {
	 print "\t[*] this signature contains old one\n";
	 print "\t[i] Length C:[". length($s)."] O:[".length($db->{$n}->{'s'})."]\n";
	}
	else {print "\t[*] unique signatures\n";}
	print "\n";

}