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Re: Sample code for sending raw packets?
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Re: Sample code for sending raw packets?


  • Subject: Re: Sample code for sending raw packets?
  • From: Dave Camp <email@hidden>
  • Date: Fri, 13 Oct 2006 11:37:29 -0700

On Oct 13, 2006, at 11:26 AM, Justin C. Walker wrote:

On Oct 13, 2006, at 11:03 , Dave Camp wrote:

- Add a static entry to the ARP table for x.x.x.x -> Printer MAC Address, where x.x.x.x is the new IP address they want to set the printer to and the Printer MAC address is the MAC address of the printer.
- Send an ICMP ping to the printer.
- Remove the ARP entry


Yes, they set the IP address of the printer by pinging it. I'll wait here for a bit while you cry.

Sounds ready-made for DOS attacks...

I'm going to guess that fiddling with the local ARP table is probably not such a swell idea and that I'd be better off hand rolling my own raw ICMP ping packet at the ethernet level to get the job done. I think it would have to be at the ethernet level as I need to specify the IP address and destination MAC address myself. I know I will have to have a SUID root helper tool to do this.

Assuming that is the case, I was wondering if someone could point me to some sample code illustrating how to build a raw ethernet packet. I've looked in the Unix Programming Book, but it only covers raw IPv4/6 packets, not raw ethernet packets. Most of the sample code I've found on the net is for Linux which appears to use different AF_ and protocol constants than BSD.

If you really want ICMP 'Echo' packets, check the source for 'ping' (or, just use 'ping' in a shell script :-}). It's on the darwin site (<http://developer.apple.com/darwin>).


Why do you want to use "raw ethernet" if you want to send ICMP packets?

I'm not well versed in the lower levels of ethernet, but it's my understanding that to form a packet where the MAC address does not match the destination IP address in the IP layer, I'd have to roll my own ethernet packet. The printer is going to listen to the packet because the MAC address matches and then change it's internal IP address to match what is in the packet.


Or am I misunderstanding something?

Dave
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References: 
 >Sample code for sending raw packets? (From: Dave Camp <email@hidden>)
 >Re: Sample code for sending raw packets? (From: "Justin C. Walker" <email@hidden>)

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