BUG in ssh-shellhost.exe

[abakum]

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest version
• Search the existing issues.

Steps to reproduce

Server side-------------------
C:\Program Files\OpenSSH>"C:\Program Files\OpenSSH"sshd -ddd
...
debug1: sshd version OpenSSH_for_Windows_9.4, LibreSSL 3.7.3
...
debug3: shell: "c:\\windows\\system32\\cmd.exe"
debug3: shell_option: /c
debug3: couldn't find CreatePseudoConsole() in kernel32.dll dll
debug3: This windows OS doesn't support conpty
debug3: pty commandline: "C:\\Program Files\\OpenSSH\\ssh-shellhost.exe" ---pty "c:\\windows\\system32\\cmd.exe"

Client side----------------------------------
mode con cols=80 lines=9999
ssh -vvv Konstantin.Abakumov@127.0.0.1
...
debug1: Local version string SSH-2.0-OpenSSH_for_Windows_9.4
debug1: Remote protocol version 2.0, remote software version OpenSSH_for_Windows_9.4
...
debug3: client_repledge: enter
debug1: ENABLE_VIRTUAL_TERMINAL_INPUT is supported. Reading the VTSequence from console
debug3: couldn't find CreatePseudoConsole() in kernel32.dll dll
debug3: This windows OS doesn't support conpty
debug1: ENABLE_VIRTUAL_TERMINAL_PROCESSING is supported. Console supports the ansi parsing
....

uf\konstantin.abakumov@WUFRS0661151 C:\Users\user>mode con

Состояние устройства CON:

Строки:                9999
Столбцы:               80
Скорость клавиатуры:   31
Задержка клавиатуры:   1
Кодовая страница:      866

------------------------------------ ssh-shellhost.exe work well on start-----------------------------------------------

------------------------------------I enlarge width of console-----------------------------------------------

Client side----------------------------------
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98

Server side-------------------
debug3: receive packet: type 98
debug1: server_input_channel_req: channel 0 request window-change reply 0
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req window-change
debug3: receive packet: type 98
debug1: server_input_channel_req: channel 0 request window-change reply 0
debug1: session_by_channel: session 0 channel 0
debug1: session_input_channel_req: session 0 req window-change

Client side----------------------------------
uf\konstantin.abakumov@WUFRS0661151 C:\Users\user>mode con

Состояние устройства CON:

Строки:                9999
Столбцы:               80
Скорость клавиатуры:   31
Задержка клавиатуры:   1
Кодовая страница:      866

------------------------------------Nothing happend!!! BUG in ssh-shellhost.exe -----------------------------------------------

exit
------------------------------------End session-----------------------------------------------
------------------------------------New session with same console-----------------------------------------------

ssh Konstantin.Abakumov@127.0.0.1
uf\konstantin.abakumov@WUFRS0661151 C:\Users\user>mode con

Состояние устройства CON:

Строки:                9999
Столбцы:               102
Скорость клавиатуры:   31
Задержка клавиатуры:   1
Кодовая страница:      866    

------------------------------------ ssh-shellhost.exe work well on start-----------------------------------------------

Expected behavior

After enlarge width of console
Columns:               102

Actual behavior

Columns:               80

Error details

The width of the console on the server side does not change

Environment data

Name                           Value
----                           -----
PSVersion                      5.1.14393.5582
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.14393.5582
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

Version

OpenSSH_for_Windows_9.4, LibreSSL 3.7.3

Visuals

No response

[abakum]

Please uncoment https://github.com/PowerShell/openssh-portable/blob/4ee8dc64982b62cd520417556515383908091b76/contrib/win32/win32compat/shell-host.c#L804. To fix:

>2) when ssh client window is resized it clears everything and gives a blank screen.

• Before https://github.com/PowerShell/openssh-portable/blob/4ee8dc64982b62cd520417556515383908091b76/contrib/win32/win32compat/shell-host.c#L845C5-L845C31
  stop transmit from stdout of cmd.exe to ssh session

• After https://github.com/PowerShell/openssh-portable/blob/4ee8dc64982b62cd520417556515383908091b76/contrib/win32/win32compat/shell-host.c#L851
  resume transmit from stdout of cmd.exe to ssh session

[abakum]

For me ssh-shellhost.exe for amd64 from #1222 (comment) works well. Were can I find ssh-shellhost.exe for 386?

[maertendMSFT]

@abakum what OS versions do you have running on the client and the server?

[abakum]

Microsoft Windows [Version 10.0.14393]
on same PC server and client

[tgauth]

Starting with Windows 10 Build 18309, ConPTY should be supported so ssh-shellhost is not needed. Is updating the OS an option?

Also, all releases have 386 binaries within OpenSSH-Win32.zip

[abakum]

VScode used winpty

[tgauth]

Are you running SSH through the VSCode extension?

[abakum]

No, but VSCode does not offer to update the Windows version - it just uses what works \8^)