From: Eric Wong <normalperson@...>
Date: 2013-04-03T05:59:34+09:00
Subject: [ruby-core:53903] Re: [ruby-trunk - Feature #7476] missing "IP_TRANSPARENT" constant for IP sockets.

Tanaka Akira <akr@fsij.org> wrote:
> 2013/2/24 ko1 (Koichi Sasada) <redmine@ruby-lang.org>:
> 
> > Feature #7476: missing "IP_TRANSPARENT" constant for IP sockets.
> > https://bugs.ruby-lang.org/issues/7476#change-36913
> 
> > There is a missing constant for IP_TRANSPARENT on linux.
> > to set the TPROXY on a socket I use:
> > s.setsockopt(Socket::SOL_IP, 19, 1)
> > The 19 suppose to be as a constant named: IP_TRANSPARENT or Socket::IP_TRANSPARENT.
> 
> This is Linux-specific and only defined in linux headers
> such as /usr/include/linux/in.h.
> 
> I'm not sure applications can safely use such headers.

We already have Linux-specific constants (e.g. TCP_CORK) and
*BSD-specific constants (e.g. TCP_NOPUSH), so I don't think we should
make it hard for users to take advantage of non-portable features on
their favorite OS.

I vote for adding IP_TRANSPARENT (and any other OS-specific constants
users request).