Socket Option Requiring Custom Implementation
Alan.Bateman at oracle.com
Wed Oct 13 03:17:17 PDT 2010
Simon James wrote:
> I apologise if this is not the appropriate list for this question and
> welcome advice where it would be better posted.
> I need to exploit the transparent proxy support in Linux.
> However, this requires the setting of a non-standard option
> (IP_TRANSPARENT) before a socket is bound.
> To achieve this, it seems to me I have to implement a
> SocketImplFactory to instantiate a custom socket implementation.
> And my custom socket implementation cannot extend PlainSocketImpl
> because it's not public.
> So I'm faced with having to write a significant amount of code to set
> on a bit.
> Before I go too far down the route, I want to check whether there are
> any openjdk initiatives that might simplify this sort of activity at
> some time in the future.
You might want to look at java.nio.channels.NetworkChannel for ideas.
You'll see that it defines the setOption/setOption methods and so isn't
restricted to the standard socket options defined in the javadoc. Some
day it might be good to retrofit classic
Socket/ServerSocket/DatagramSocket with methods like these. That way an
implementation could support additional and platform specific options.
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