Add to the documentation how to use OpenVPN through a socks5 proxy

[evsasha]

Hello, recently I encountered a problem, actually a couple of them.

In my country (Russia), PIA is blocked:

• Access to https://www.privateinternetaccess.com is restricted, thus it's not possible to download the configuration script. This issue has already been described in the documentation, so I won't dwell on it.
• Direct connection to PIA's VPN servers via OpenVPN is not feasible, as packets are dropped during the TLS handshake.

The solution is to use a connection through socks5 (provided by PIA or external).

Here's how to use a socks5 proxy for OpenVPN.

For the connection, you'll need (an example for PIA proxy):

• Login and password for the proxy server from your account settings (this is NOT the login and password for the VPN connection).
  You can find it at the bottom of the page: https://www.privateint…ontrol-panel#downloads
  Section: VPN settings --> SOCKS
• IP Address of the socks5 proxy, which can be obtained from https://helpdesk.priva…u-offer-a-socks5-proxy
  Make sure to get the IP address specifically.

The user's login and password need to be placed in a file, which should then be mounted into the container. The file format should be text, with the user's login on the first line and their password on the second line. More information can be found in the documentation: https://openvpn.net/community-resources/reference-manual-for-openvpn-2-4/

The server IP, port, and authentication file need to be passed as launch arguments for OpenVPN.

-v /volume1/docker/pia/socks-auth.txt:/etc/socks-auth.txt \
-e "OPENVPN_OPTS=--inactive 3600 --ping 10 --ping-exit 60 --socks-proxy **** 1080 /etc/socks-auth.txt" \

I suggest adding a note about using socks5 to the documentation.

[evsasha]

Unfortunately, I rushed with the idea. I haven't been able to make this configuration work reliably yet.