shell vs. process
luis at anachreon.co.uk
Mon Oct 9 19:23:41 EDT 2006
ICMPd sends the data packets in either TCP or UDP over that port
number, check IANA: http://www.iana.org/assignments/port-numbers
Here is the packet structure: http://www.techbooksforfree.com/
Hope that helps!
On 10 Oct 2006, at 0:10, Trevor DeVore wrote:
> On Oct 9, 2006, at 3:37 PM, Luis wrote:
>> ICMPd is the daemon ('shell app') that runs the request over that
>> port. It would be a case of recreating the ICMPd functionality in
>> Rev, all it's doing is sending specifically formed packets over
>> that port that servers/routers/etc running their own ICMPd will
>> respond to.
>> It's a small app. If anyone else is interested then I might have a
>> look at the code (should be able to get a hold of the C/C++ source
>> code) and attempt to translate it to Transcript. Not too sure how
>> tight I can get the timings, but it should be accurate enough.
> I'm no expert in this area and I would love to learn that you can
> write your own ping utility in Rev. I researched this a few days
> ago in an attempt to do so. Creating the actual ICMP echo request
> message isn't a big deal in Rev. I *think* the problem you would
> have is when that message gets wrapped up in the IP Datagram
> structure which I believe Rev does when you write to a socket. The
> docs say that Rev's open socket command only uses "TCP" and "UDP"
> so there doesn't seem to be a way to send data over a socket that
> identifies itself as the ICMP protocol. I would think that ping
> daemons would only watch for traffic that was send using the ICMP
> protocol but I don't know.
> Trevor DeVore
> Blue Mango Learning Systems - www.bluemangolearning.com
> trevor at bluemangolearning.com
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