Listen on specific interface or IP address

[FreedomPrevails]

Hey guys,
How can I configure the server to listen on a specific interface or IP address ?

[alalamav]

Hi @FreedomPrevails, currently the server will listen on the any address (0.0.0.0), meaning it will listen on all available interfaces. The server will listen on all ports specified in the config file.

What is your use case to listen on a particular IP/interface?

[fortuna]

I guess we could provide a flag for that. We haven't done it because it wasn't a need for Outline.

This is where we would set the address:

outline-ss-server/server.go

Lines 77 to 82 in 264ddf9

	func (s *SSServer) startPort(portNum int) error {
	listener, err := net.ListenTCP("tcp", &net.TCPAddr{Port: portNum})
	if err != nil {
	return fmt.Errorf("Failed to start TCP on port %v: %v", portNum, err)
	}
	packetConn, err := net.ListenUDP("udp", &net.UDPAddr{Port: portNum})

You can fork our main as a workaround

[zykrah]

Hi there, I was wondering whether or not there was a plan to implement this feature. My main use case is that only the 443 TCP port seems to work with my access key, however, I have other applications (a website through an nginx reverse proxy) utilizing the port 443. I thought i'd be able to just get another IP address, and then run nginx on one, and Outline on the other, however that doesn't seem to be possible as Outline seems to be attempting to listen to 0.0.0.0, so it always errors if any other app is already listening on that port, even if it's only listening to a specific IP.

[fortuna]

I believe we can implemented in the config with something like:

keys:
  - id: user-0
    ip: 1.2.3.4
    port: 9000
    interface: eth0
    cipher: chacha20-ietf-poly1305
    secret: Secret0

[maddyhof]

Closing as duplicate of #19