Not returning to shell prompt after ssh command on host via ProxyJump

[abeith]

Checklist

• Using latest version on the App Store
• Read the docs
• Searched for existing GitHub issues

Configuration

iPhone:
Blink v17.3.0.916
iOS 17.6.1

iPad:
Blink v17.3.0.916
iPadOS 17.6.1

remote1:
Ubuntu 20.04.6 LTS
OpenSSH_8.2p1 Ubuntu-4ubuntu0.11, OpenSSL 1.1.1f 31 Mar 2020

jumphost1:
Debian GNU/Linux 11 (bullseye)
OpenSSH_8.4p1 Debian-5+deb11u2, OpenSSL 1.1.1w 11 Sep 2023

remote2:
MacOS 14.3.1
OpenSSH_9.4p1, LibreSSL 3.3.6

jumphost2:
Ubuntu 22.04.4 LTS
OpenSSH_8.9p1 Ubuntu-3ubuntu0.10, OpenSSL 3.0.2 15 Mar 2022

Describe the bug

Running a command over ssh doesn't return to the prompt in the shell when the host is configured with a ProxyJump. Ctrl-C is required to get the prompt back.

blink> ssh remote1 echo test
Connected to
test
_

blink> ssh remote2 echo test
Connected to
test
_

Expected behaviour is seen when connecting directly to jump hosts.

blink> ssh jumphost1 echo test
Connected to <IP address>
test
blink>

blink> ssh jumphost2 echo test
Connected to <IP address>
test
blink>

[carloscabanero]

Should be fixed on Blink 18.

[carloscabanero]

I removed this from the branch because I need further testing. The most reliable workaround is to close the background process with Ctrl-C itself.

Another idea here is to finally remove custom ProxyCommand, which triggers a background ssh command session, and just support ProxyJump. If I recall, all ProxyCommand cases we use are just manual ProxyJump configurations anyway.