get_unique_ips.pl

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#!/usr/bin/perl -w

use strict;
use Data::Dumper;
use constant DEBUG => 1;

my %IPs;
my $octet = '(\d){1,3}';
my $combo = "($octet\\.$octet\\.$octet\\.$octet:\\d+)"; #IP:port
#The only IP:port combos we want are the ones that are actually used
#as endpoints, as determined on the IP layer.  (Spurious and irrevelant combos
#can appear in the headers, for esoteric reasons.)
#ipgrab prints the combos it finds by actually inspecting the IP layer
#in this format:  [source_ip:source_port->destination_ip:destination_port].
#Hence any combo truly used will either start or end with a square bracket.
#!my $IP_address_regex = qr{[$combo|$combo]};
my $IP_address_regex = qr{\[$combo};

#because File::Find does not work as documented
my $find_command = "find @ARGV -type f";
print "Running find command $find_command\n" if DEBUG;
open (FILES, "$find_command |")
    or die "Could not run find command $find_command:  $!";
while (<FILES>)
{
    chomp;
    &get_IPs ($_);
}
print Data::Dumper->Dump ([ \%IPs ], [ 'server_map' ]);

sub get_IPs
{
    my $filename = shift();
    print "Examining file $filename...\n" if DEBUG;

    if (! sysopen (FILE, $filename, 0))
    {
	warn "Could not open file $filename";
	return;
    }
    while (<FILE>)
    {
	my @matches;
	print "Next line...\n" if (DEBUG == 2);
	while (m/\G$IP_address_regex/g)
	{
	    print "Got match $1\n" if DEBUG;
	    push @matches, $1;
	    map { $IPs{$_} = '' unless exists $IPs{$_}; } @matches;
	}
    }
}