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To: Marxx <marxx@mars.superlink.net>
cc: hackers@freebsd.org
Subject: Re: User built packet header generation 
In-reply-to: Your message of "Sun, 28 Jan 96 19:26:27 PST."
             <Pine.SGI.3.91.960128222218.17229A-100000@mars.superlink.net> 
Date: Mon, 29 Jan 1996 09:35:57 PST
From: Bill Fenner <fenner@parc.xerox.com>
Message-Id: <96Jan29.093601pst.177478@crevenia.parc.xerox.com>
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In message <Pine.SGI.3.91.960128222218.17229A-100000@mars.superlink.net> you wr
ite:
>	Has anyone experimented with amnually generating packet headers?
>I've done some xpermineting, but ti causes the kernel to panic at
>m_copym in /kern/uipc_mbuf.c. Can anyone give em any insight, or a solution?

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.

  Bill