sending a magic packet triggered from iptables [solved]

[dermund]

Hi

I want to wakeup up my music server if my Xbox360 is powered up. My router in the middle runs linux and iptables. Is it (and how) possible to capture whatever the xbox sends at startup [I guess it will send some stuff] from iptables and trigger a external program that sends a magic packet to wakeup the server?

My problem can nearly be narrowed to the iptables thing: How do I capture this xbox stuff and how do I trigger a external program with iptables rules.

T h a n k s
D e r m u n d

[Zepp]

[dermund]

[aronparsons]

I don't think an iptables target exists to execute a command. However, you could use the 'LOG' target, a syslog filter to send matches for that iptables log entry to a certain file and a script that sets up an inotify watch on that log file and when a write event occurs, send the WOL packet. Maybe there's an easier way, but that would work and shouldn't be too difficult to implement.

Another option is to create a small daemon that sends one ICMP packet to your Xbox's IP every few seconds. If it replies, send a WOL packet. It would be more resource intensive (although we're talking about nothing here really). I had something like this setup to set limits on KTorrent when my XBMC would come up due to limited wireless bandwidth.

[cyrillic]

If you run dnsmasq on your router, you could easily use the "dhcp-script=" option in /etc/dnsmasq.conf to trigger an external program when your Xbox360 requests an IP address.

[dermund]

Yea, cool, thanks. Both nice ways. ICMP is quick and easy and I think my router could get the workload managed Thanks for the dhcp-script option however, I will try that too.