windows: Implement ssh using NamedPipe

[JunkuiZhang]

Closes #ISSUE

Recently, I've been trying to implement the remote ssh feature for Windows. Due to my coursework, progress was slow, but anyway...

Given Zed’s current remote ssh implementation, here are two main issues that arise on Windows:

• The current implementation uses UnixSocket for inter-process communication, facilitating password entry between ssh and zed. However, Windows added support for AF_UNIX in the 2018 Fall Update of Windows 10, and even then, the support remains limited, as explained here: https://devblogs.microsoft.com/commandline/af_unix-comes-to-windows/.

• Additionally, the current implementation leverages UnixSocket and the ControlPath option for SSH connection multiplexing, but this is unsupported on Windows. You can find more details here: ControlPath in ssh_config fails v0.0.3.0 PowerShell/Win32-OpenSSH#405 and https://github.com/PowerShell/Win32-OpenSSH/wiki/Project-Scope.

After testing several approaches, I’ve narrowed it down to two possible solutions. These differ only in how they handle the first issue:

Solution 1 (This PR)

For the inter-process communication issue, this solution uses NamedPipe, which is recommended by Microsoft, to emulate UnixSocket functionality.

• Pros: No need for additional crates or helper programs.
• Cons: Requires further code abstraction for maintainability.

Solution 2 (#20587)

In this solution, I utilize the newly introduced UnixSocket on Windows for inter-process communication. However, due to its limited support, an auxiliary program askpass_helper.exe is required to play the askpass.sh script’s role.

• Pros: The logic is consist with Unix-based systems, making maintenance easier.
• Cons: Introduces an extra helper program and the windows_net crate.

For the second issue, since Windows doesn’t support connection multiplexing, my approach is to use a password_helper.cmd script to avoid prompting the user repeatedly for their password. The script relies on SharedMemory to retrieve the ssh password.

Currently, I’m not sure which solution to go with, so I’d love to hear Zed team’s thoughts.

Any feedback on these is welcome!

Some demo:

Screen.Recording.2024-11-13.192447.mp4

Screen.Recording.2024-11-13.193933.mp4

Release Notes:

• N/A or Added/Fixed/Improved ...

[zed-industries-bot]

	Messages
📖	This PR includes links to the following GitHub Issues: #PowerShell/Win32-OpenSSH#405 If this PR aims to close an issue, please include a Closes #ISSUE line at the top of the PR body.

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