From owner-freebsd-hackers  Mon Jan 29 12:54:23 1996
Return-Path: owner-hackers
Received: (from root@localhost)
          by freefall.freebsd.org (8.7.3/8.7.3) id MAA02284
          for hackers-outgoing; Mon, 29 Jan 1996 12:54:23 -0800 (PST)
Received: from gvr.win.tue.nl (root@gvr.win.tue.nl [131.155.210.19])
          by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id MAA02277
          for <hackers@freebsd.org>; Mon, 29 Jan 1996 12:54:15 -0800 (PST)
Received: by gvr.win.tue.nl (8.6.10/1.53)
    id VAA07922; Mon, 29 Jan 1996 21:48:36 +0100
From: guido@gvr.win.tue.nl (Guido van Rooij)
Message-Id: <199601292048.VAA07922@gvr.win.tue.nl>
Subject: Re: User built packet header generation
To: fenner@parc.xerox.com (Bill Fenner)
Date: Mon, 29 Jan 1996 21:48:36 +0100 (MET)
Cc: marxx@mars.superlink.net, hackers@freebsd.org
In-Reply-To: <96Jan29.093601pst.177478@crevenia.parc.xerox.com> from "Bill Fenner" at Jan 29, 96 09:35:57 am
X-Mailer: ELM [version 2.4 PL24]
Content-Type: text
Sender: owner-hackers@freebsd.org
Precedence: bulk

> 
> Well, you could look at /usr/src/usr.sbin/traceroute/traceroute.c, which
> generates its own IP headers.  You need to open an IPPROTO_RAW socket,
> setsockopt(..., IPPROTO_IP, IP_HDRINCL, ...), and then write() a fully
> formed packet.
> 

Look for ipsend in the ip_filter package. I believe you can find it
at:
http://coombs.anu.edu.au/~avalon/ip-filter.html
ftp://coombs.anu.edu.au/pub/net/kernel/ip_fil3.0.1.tar.gz
The userinterface is horrible though.

-Guido