Perl can listen on multicast streams easily with IO::Socket::Multicast. There is even an IPv6 version at IO::Socket::Multicast6.

Here is a simple multicast listener example (IPv4-only):

#!/usr/bin/perl

use strict;
use warnings;
use IO::Socket::Multicast;

my $sock = IO::Socket::Multicast->new(
    LocalPort => 7070,
    ReuseAddr => 1
) or die "Cannot create client\n";;

$sock->mcast_add("239.192.1.1") || die "Cannot set group: $!\n";

my $data;
while (1) {
    $sock->recv($data,1024);
    my $peer_addr = $sock->peerhost();
    my $peer_port = $sock->peerport();
    print "($peer_addr:$peer_port): $data\n"
}

[download]

You can use a select() timer instead of the while loop and if you reach a timeout - send the email.

In reply to Re: Point me in the right direction - Monitor a Mulicast IP address or stream by VinsWorldcom
in thread Point me in the right direction - Monitor a Mulicast IP address or stream by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.