Socket Option Requiring Custom Implementation
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. Regards Simon
Re: Socket Option Requiring Custom Implementation
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. Regards Simon 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. -Alan.
