Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:13078
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Reply-To: lpedretti@suserver.com
Organization: Axon Sistemas
To: internals@lists.php.net
Date: Thu, 30 Sep 2004 15:59:14 -0300
User-Agent: KMail/1.7
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline
Message-ID: <200409301559.14081.lpedretti@suserver.com>
Subject: Add SO_ORIGINAL_DST support and SOL_IP constant to socket_get_options()
From: lpedretti@suserver.com (Leonardo Pedretti)

I forgot to explain why did I added this option to the list of supported=20
options:

when you implement a transparent proxy, the routing kernel makes a destinat=
ion=20
address NAT and changes it to 127.0.0.1 and some port you declare when you=
=20
instruct the kernel to do the redirection through iptables or any other=20
firewall administration utility. When you have an application running=20
listening on that port, and it receives a connection, you can not know what=
=20
was the original destination address, usually needed to perform the task a=
=20
transparent proxy should do. However, you can fetch the original destinatio=
n=20
address of the connection using the getsockopt() with the SO_ORIGINAL_DST=20
option.
So that is why this option is useful.

Regards
Leo

=2D-=20

Leonardo Pedretti
Axon Sistemas
L=EDder de Equipo Proyecto Basalto