Bug 3133

Summary: Dynamically Assigned Ports for DynamicForward and LocalForward
Product: Portable OpenSSH Reporter: Chris <cmirchandani>
Component: sshAssignee: Assigned to nobody <unassigned-bugs>
Status: NEW ---    
Severity: enhancement CC: norman
Priority: P5    
Version: 8.2p1   
Hardware: All   
OS: All   

Description Chris 2020-03-10 03:19:49 AEDT 
The RemoteForward option allows a port to be dynamically assigned if 0 is entered as the port number. It would be helpful if the ssh client could do the same for DynamicForwards and LocalForwards.
Comment 1 Norman Rasmussen 2021-04-24 06:12:25 AEST 
+1. RemoteForward has had the ability to dynamically allocate the listening port since bz#1003, but LocalForward doesn't currently support it.

I'd like to be able to do something like:
$ ssh -MNf remote
$ port=$(ssh -O forward -L 0:localhost:1234 remote)
$ client localhost:$port

without having to do a "localport=$(( 32000 + $RANDOM )); ssh -L $localport:localhost:1234 && break" loop, or something similar.