parsepcap.pl

use Net::TcpDumpLog;
use NetPacket::Ethernet;
use NetPacket::IP;
use NetPacket::TCP;
use strict;
use warnings;
use diagnostics;
#http://hype-free.blogspot.com/2010/03/parsing-pcap-files-with-perl.html

my $log = Net::TcpDumpLog->new();
$log->read("log.pcap");

foreach my $index ($log->indexes) {
  my ($length_orig, $length_incl, $drops, $secs, $msecs) = $log->header($index);
  my $data = $log->data($index);

  my $eth_obj = NetPacket::Ethernet->decode($data);
  next unless $eth_obj->{type} == NetPacket::Ethernet::ETH_TYPE_IP;

  my $ip_obj = NetPacket::IP->decode($eth_obj->{data});
  next unless $ip_obj->{proto} == NetPacket::IP::IP_PROTO_TCP;

  my $tcp_obj = NetPacket::TCP->decode($ip_obj->{data});
  my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime($secs + $msecs/1000);
  print sprintf("Time: %02D-%02d %02d:%02d:%02d.%d\n",
    $mon, $mday, $hour, $min, $sec, $msecs);
  print "\tIP Address Source: ", $ip_obj->{src_ip}, "\n\t\tMac Address Source: ", $eth_obj->{src_mac},
   "\n\t\tPort Numbers: ", $tcp_obj->{src_port};
  print "\n\tIP Address Destination: ", $ip_obj->{dest_ip}, "\n\t\tMac Address Destination: ", $eth_obj->{dest_mac}, " \n",
  "\t\tPort Numbers: ", $tcp_obj->{dest_port}, "\n";
}