Support connecting to TOR SOCKS5 address in Unix Socket format

[phantomcraft]

Tor has an option to listen its SOCKS5 server as an unix socket.

If Tor-DNS could connect to this kind of address would be useful for containers and sandboxes.

There is a small program called "unix-to-tcp": https://github.com/porty/unix-to-tcp/blob/master/main.go

/\ Could serve as a basis.

[bfix]

A new version that can connect to the Tor proxy via a Unix domain socket is pushed. Please read the changed README and report back any issues as I am not having a test environment at the moment - thanks.

[phantomcraft]

I just tested here, works well:

./Tor-DNS -p "127.0.0.1:10053" -s "unix+/var/run/tor/socks"
dig @127.0.0.1 -p 10053 duckduckgo.com

; <<>> DiG 9.11.5-P4-5.1+b1-Debian <<>> @127.0.0.1 -p 10053 duckduckgo.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 36522
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;duckduckgo.com.			IN	A

;; ANSWER SECTION:
duckduckgo.com.		900	IN	A	176.34.155.23

;; Query time: 1681 msec
;; SERVER: 127.0.0.1#10053(127.0.0.1)
;; WHEN: Mon Sep 09 09:24:28 EDT 2019
;; MSG SIZE  rcvd: 48

I use this config in my torrc:
SocksPort unix:/var/run/tor/socks IPv6Traffic PreferIPv6 WorldWritable

Very useful when using Tor with an isolated network namespace, even more for tunneling OpenVPN over Tor inside it, Tor-DNS provides a DNS resolutor and https://github.com/porty/unix-to-tcp provides a socks proxy, none of these having to listen on veth pairs and depending on dozen of iptables rules for preventing traffic leaking.

You can close this issue, thank you very much.