Has anyone ever messed with writing a port scan detector? I was trying to use PortSentry on an SGI. Didn't work (go figure). I've written quite a few network type scripts but never one that watches more than one port/socket at a time. So I decided to try writing my own. Here's the compact version of what I have so far: 
#!/usr/perl/bin/perl

use IO::Socket;
use IO::Select;

sub AddSocket {
  my $port = $_[0];

  $sock = new IO::Socket::INET(Listen => 1, LocalPort => $port);

  $sock;
}

$one = "6666";
$two = "6667";

$s = IO::Select->new();
$s->add(AddSocket($one));
$s->add(AddSocket($two));

while (@ready = $s->can_read) {
  # Not sure what's next
}

[download]

Once I start the program, sw shows both ports being listened to. As a first step, I just want to figure out which port(s) got a connection and print that info to the screen. My problem is, after I connect to either port, how do I select between the list of listened-to ports? I've tried the 'select' statement a couple different times but with no luck.

Anyone have any ideas?

Thanks.

Darrin Moran

In reply to Compact port scan detector by dmoran

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