From owner-freebsd-net@FreeBSD.ORG  Tue Feb 10 02:42:32 2009
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 4CAF01065670
	for <freebsd-net@freebsd.org>; Tue, 10 Feb 2009 02:42:32 +0000 (UTC)
	(envelope-from mij@bitchx.it)
Received: from voodoo.publicshout.org (heroin.publicshout.org [81.208.58.150])
	by mx1.freebsd.org (Postfix) with SMTP id 857328FC18
	for <freebsd-net@freebsd.org>; Tue, 10 Feb 2009 02:42:31 +0000 (UTC)
	(envelope-from mij@bitchx.it)
Received: (qmail 65111 invoked by uid 0); 10 Feb 2009 02:15:47 -0000
Received: from unknown (HELO ?192.168.10.172?)
	(m.mazzucchi@keencons.com@unknown)
	by unknown with SMTP; 10 Feb 2009 02:15:47 -0000
Message-Id: <7AB15D3E-5E8C-4FE9-873F-F8BAE72B8C6B@bitchx.it>
From: Mij <mij@bitchx.it>
To: freebsd-net@freebsd.org
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
Content-Transfer-Encoding: 7bit
Mime-Version: 1.0 (Apple Message framework v930.3)
Date: Tue, 10 Feb 2009 03:15:31 +0100
X-Mailer: Apple Mail (2.930.3)
Subject: SO_BINDANY in FreeBSD
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 10 Feb 2009 02:42:32 -0000

Hello folks,

OpenBSD provides a SO_BINDANY socket option that allows an
application to produce traffic from an IP address which is not  
configured
on the host:

http://www.openbsd.org/cgi-bin/man.cgi?query=setsockopt

This is useful to run a transparent proxy which receives connections  
from
X and wants to connect to the real destination pretending to be X.

Is there any possibility to see this option implemented in FreeBSD? Do
you otherwise have workarounds for getting the same behavior with
reasonable complexity (eg, avoiding handling raw frames with bpf)?