Support forwarding to other hosts only reachable from remote in remote.SSH.defaultForwardedPorts (like the Ports tab) #11929

Feature request: Support forwarding to other hosts in remote.SSH.defaultForwardedPorts (like the Ports tab)

• VS Code Version: 1.139.1
• Remote-SSH Version: 0.128.0
• Local: Windows
• Remote: Linux
• Remote Connection Type: SSH

Description

Related to #9715.

In the Ports tab, I can forward a port on a host that is reachable from the SSH remote (not the remote itself) by entering hostname:port. This works perfectly:

However, there is no way to configure the same forwards in settings.json via remote.SSH.defaultForwardedPorts:

"remote.SSH.defaultForwardedPorts": [
    {
        "name": "Service on other host",
        "localPort": 8080,
        "remotePort": 8080,
        "host": "hostname"          // ignored: forwarding remote localhost
    },
    {
        "name": "Service on other host",
        "localPort": 2705,
        "remotePort": "hostname:2705" // Incorrect type. Expected number
    }
]

• A host property is not part of the schema and is ignored.
• the forward always targets localhost:<remotePort> on the SSH remote.
• Using "hostname:port" as remotePort (as in defaultForwardedPorts differs from User forwarded Ports #9715) is rejected by the schema, and according to defaultForwardedPorts differs from User forwarded Ports #9715 it does not work either.

Expected behavior

remote.SSH.defaultForwardedPorts should support the same targets as the Ports view, either via:

1. a new optional host property (default: localhost), or
2. accepting "hostname:port" as remotePort like in the ports tab.

Use case

Services in an internal network are only reachable through the SSH remote (jump host).
Currently I can configure this with LocalForward in ~/.ssh/config or forward ports manually in the Ports view, but I would like to define these forwards in settings.json, together with my other port forwards, without depending on the SSH config which makes setting dynamic ports via attributes easier.

Screenshot eith the wanted behavior from the ports tab