Feature request: add Unix Domain Socket listener support

[ziojacky]

Currently the program only supports listening on IP:PORT.

It would be useful to support Unix Domain Socket as an alternative listener.

Use cases:

• Local applications can communicate without occupying TCP/UDP ports.
• Lower overhead for local communication.

[database64128]

Shameless plug: I added unix domain socket SOCK_STREAM listener support to shadowsocks-go last month. I also intend to add SOCK_DGRAM support, but it's arguably less useful, and I want to wait until I finish redesigning the packet abstractions.

[zonyitoo]

What kind of client software / application supports proxy configurations using UDS?

[database64128]

What kind of client software / application supports proxy configurations using UDS?

From curl(1):

Unix domain sockets are supported for socks proxy. Set localhost for the host part. e.g. socks5h://localhost/path/to/socket.sock

Although this is unrelated to the reason I added unix domain socket support to shadowsocks-go, which is for cross Linux network namespace communication to an app that does not support unix domain sockets.