At 19:47 09/10/00 +0000, Hafida Fouta wrote:
>I need to know cause it is part of my TCP/IP project.
Then you'd need to get Stevens book "Unix Network Programming, second
edition, vol1".
Chapter 25 explains how to write raw sockets code. I'm pretty sure your
universty has
a copy.
The book source code should be available on http://www.noao.edu/~rstevens.
A good starting point may be the "ping" program. all it does is sending
ICMP_ECHO and
receiving ICMP_ECHOREPLY. and you need to send ICMP_MASKREQ and receive
ICMP_MASKREPLY. so check the source code of ping.
Note however that systems do not necessarily reply to ICMP_MASKREQ packets.
In particular,
by default BSD systems won't reply unles you "sysctl -w icmpmaskrepl=1". I
suspect
other systems act similarly. so you'll need to make sure the target system
replies to these
packets.
cheers,
mouss
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