Local port forward with binding address other than localhost

[justinvdk]

Is your feature request related to a problem? Please describe.

I'd like to do a local forward that allows traffic from outside, so that I could use my phone as bridge between systems that its both connected to. In this case a device that I tether internet to, and a device that is connected to the same VPN:

[Device A] - VPN -> [Phone with ConnectBot] - [USB/WIFI tether] -> [Device B]

Describe the solution you'd like

It seems that the SSH library supports it; but the InetAddress.getLocalHost() is always passed:

connectbot/app/src/main/java/org/connectbot/transport/SSH.java

Lines 647 to 649 in 061f97d

	lpf = connection.createLocalPortForwarder(
	new InetSocketAddress(InetAddress.getLocalHost(), portForward.getSourcePort()),
	portForward.getDestAddr(), portForward.getDestPort());

I understand that this is very niche so it should not make configuring a local forward harder in any way. Perhaps a checkbox with "Override bind address" should be put next to it, that defaults to false. Such that a user is not confronted with extra (niche) options.

Describe alternatives you've considered

None, I realised there was no way to express this configuration; thus I looked into the source to confirm.

Since I also have ssh access to Device A; I was able to to a remote forward from ConnectBot. This solved my problem. I'll let the issue stand if anyone is interested regardless, author/maintainer can close if there is no such need.

Additional context

Has there been any such request before? I've searched PRs and Issues but I could not find any.