And in the spirit of using Perl for reinventing wheels, a TCP packet dumper using
Net::PcapUtils ... :-)
use Net::PcapUtils;
use NetPacket::IP;
use NetPacket::TCP;
use NetPacket::Ethernet qw/:types/;
use strict;
Net::PcapUtils::loop(
sub {
my ($arg, $header, $packet) = @_;
my $ethernet = NetPacket::Ethernet->decode($packet);
if ($ethernet->{'type'} == ETH_TYPE_IP) {
my $ip = NetPacket::IP->decode($ethernet->{'data'}, $ether
+net);
my $tcp = NetPacket::TCP->decode($ip->{'data'});
print
$ip->{'src_ip'}, ":", $tcp->{'src_port'}, " -> ",
$ip->{'dest_ip'}, ":", $tcp->{'dest_port'}, "\n\n";
my @data = split //, $tcp->{'data'};
while (@data) {
print "\t";
for (0..7) {
print sprintf("%02x", shift(@data)), " ";
}
print "\n";
}
print "\n";
}
},
'DEV' => 'lo'
);