[tor-dev] Understanding Tor and SOCKS

spriver spriver at autistici.org
Mon Oct 27 07:13:35 UTC 2014

Thank you for the explanation! This was the exactly the question. (I was 
just wondering why BND.ADDR and BND.PORT get set to NUL, )

Have a nice day!

Am 2014-10-26 18:31, schrieb Yawning Angel:
> On Sun, 26 Oct 2014 14:34:59 +0100
> Rob van der Hoeven <robvanderhoeven at ziggo.nl> wrote:
>> So, the SOCKS protocol supports redirection to another SOCKS server.
>> An all-zero address/port simply means: use the server/port that you
>> are currently connected to.
> That's a really interesting way of interpreting that part of the RFC.
> The reason why BND.ADDR and BND.PORT are supplied in a SOCKS5 response
> is to provide the client with the information equivalent to calling
> getsockname() on a non-proxied socket.
> In the context of tor, the reason why BND.ADDR and BND.PORT are all NUL
> bytes is because the RELAY_CONNECTED cell does not propagate BND.PORT
> backwards to the client from the exit.  BND.ADDR could technically be
> filled in (since the tor client knows where it is exiting from), but I
> don't see much point (and this information is useless at best in the
> context of HSes).
> Regards,
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