From owner-freebsd-hackers@FreeBSD.ORG  Mon May 26 19:49:18 2008
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id F071C1065672;
	Mon, 26 May 2008 19:49:18 +0000 (UTC)
	(envelope-from dillon@apollo.backplane.com)
Received: from apollo.backplane.com (apollo.backplane.com [216.240.41.2])
	by mx1.freebsd.org (Postfix) with ESMTP id BD6B28FC23;
	Mon, 26 May 2008 19:49:18 +0000 (UTC)
	(envelope-from dillon@apollo.backplane.com)
Received: from apollo.backplane.com (localhost [127.0.0.1])
	by apollo.backplane.com (8.14.1/8.14.1) with ESMTP id m4QJaS8Z074047;
	Mon, 26 May 2008 12:36:28 -0700 (PDT)
Received: (from dillon@localhost)
	by apollo.backplane.com (8.14.1/8.13.4/Submit) id m4QJaS7Q074045;
	Mon, 26 May 2008 12:36:28 -0700 (PDT)
Date: Mon, 26 May 2008 12:36:28 -0700 (PDT)
From: Matthew Dillon <dillon@apollo.backplane.com>
Message-Id: <200805261936.m4QJaS7Q074045@apollo.backplane.com>
To: Kris Kennaway <kris@freebsd.org>
References: <BCBAE9EA84D54762AD983B29B2752492@multiplay.co.uk>
	<483B05DB.3000309@FreeBSD.org>
Cc: freebsd-hackers@freebsd.org, Steven Hartland <killing@multiplay.co.uk>
Subject: Re: Using sendmsg for SCM_CREDS results in EINVAL on PF_INET socket
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 26 May 2008 19:49:19 -0000

:> using the following code to send credentials to a remote host
:> results in EINVAL from sendmsg.
:> 
:> I suspect that SCM_CREDS is only valid for PF_LOCAL / PF_UNIX
:> sockets and not PF_INET sockets and hence the code in dbus
:> is actually invalid.
:> 
:> Can anyone confirm this is the case or not?
:
:What would it even mean to send credentials to a remote host over an 
:AF_INET socket?
:
:Kris

    The only way to do it is to do a connect-back to a secure port.  In
    otherwords, to use the identd protocol.

    Control messages like SCM_CREDS (and descriptor passing for that matter)
    only work over local protocol sockets.

					-Matt
					Matthew Dillon 
					<dillon@backplane.com>