[tor-talk] Transparent proxy question

[Aeris]

> but how can Tor determine the original
> destination IP and port that client wanted to reach? How does this magic
> work?

Hi,

Original hostname and port are set by iptables on the socket through 
setsockopt, SOL_IP & SO_ORIGINAL_DST, and available on Tor with getsockopt.

https://gitweb.torproject.org/tor.git/tree/src/or/connection_edge.c#n1816
http://man7.org/linux/man-pages/man2/setsockopt.2.html
https://github.com/torvalds/linux/blob/master/include/uapi/linux/netfilter_ipv4.h#L74-L78

Regards,
-- 
Aeris
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