Sample code for sending raw packets?
Sample code for sending raw packets?
- Subject: Sample code for sending raw packets?
- From: Dave Camp <email@hidden>
- Date: Fri, 13 Oct 2006 11:03:15 -0700
The list search engine seems to be down at the moment....
I'm working on a utility for a networked laser printer. The printer
will default to an IP address of 192.0.0.192 if it cannot get a DHCP
address. Given that the printer also has no front panel display or
controls, the only way for the user to change the IP address will be
to use my utility.
I will caveat what I'm about to write with: I'm just the poor guy
writing the utility, I have no control over the firmware implementation.
The documentation I have been given indicates they change the IP
address of the printer in this case by performing the following on
Windows:
- 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.
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.
Thoughts?
Thanks,
Dave
---
Among the chief weapons of UNIX: Fear, surprise and ruthless
efficiency.
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