Re: Sample code for sending raw packets?
Re: Sample code for sending raw packets?
- Subject: Re: Sample code for sending raw packets?
- From: Dalton Hamilton <email@hidden>
- Date: Fri, 13 Oct 2006 14:38:40 -0400
I've got socket code that sends out ICMP packets generating my own
ping and my own traceroute packets. However, I did this in sockets
for efficiency and speed. In your case, you don't need the code to
fast; therefore, I suggest you build a string and call the system()
call. string = "/sbin/ping x.x.x.x" and then use system(string).
You build you program using the existing ping and arp code -- i.e.
likewise, you can add the arp entry doing the same.
Why spend multiple days writing code that does the same thing as code
already written?
If you really want the ping socket code, I can email it to you
offline next week -- I'm on vacation and away from my src at the moment.
Dalton Hamilton
On Oct 13, 2006, at 2:03 PM, Dave Camp wrote:
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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