Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
#!/usr/bin/perl -Tw use constant EMAIL => 'email@yourdomain.com'; use constant SERVER => 'mail.yourdomain.com'; use Net::PcapUtils; use Net::SMTP; use NetPacket::ARP; use NetPacket::Ethernet qw/:types/; use strict; my %ether; my $mail = Net::SMTP->new(SERVER); Net::PcapUtils::loop( sub { my ($arg, $header, $packet) = @_; my $ethernet = NetPacket::Ethernet->decode($packet); if ($ethernet->{'type'} == ETH_TYPE_ARP) { my $arp = NetPacket::ARP->decode($ethernet->{'data'}, $eth +ernet); my $ip = join '.', map { hex } ($arp->{'spa'} =~ /([[:xdig +it:]]{2})/g); my $mac = join ':', ($arp->{'sha'} =~ /([[:xdigit:]]{2})/g +); if ((exists $ether{$ip}) && ($ether{$ip} ne $mac)) { $mail->to(EMAIL); $mail->mail('root@yourdomain.com'); $mail->data; $mail->datasend("There has been a change in the MAC ad +dress associated with IP address ", $ip, "!\n\n"); $mail->datasend(" Previous hardware MAC address -> +", $ether{$ip}, "\n"); $mail->datasend(" Current hardware MAC address -> " +, $mac, "\n"); $mail->dataend; $mail->quit; } $ether{$ip} = $mac; } }, 'DEV' => 'eth0' );

In reply to ARP Watch by rob_au

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!
  • 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, 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, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • Outside of code tags, you may need to use entities for some characters:
            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.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others making s'mores by the fire in the courtyard of the Monastery: (4)
    As of 2014-09-18 22:56 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      How do you remember the number of days in each month?











      Results (126 votes), past polls