Add Windows support (socket types, OpenSSL linking, IPv6 fallback)

[AliRezaBeigy]

Adds Windows support with socket type compatibility, OpenSSL linking fixes, and IPv6 fallback for UDP socket binding.

Changes:

• Add winapi dependency for Windows socket types
• Fix OpenSSL library linking on Windows (libssl/libcrypto instead of ssl/crypto)
• Replace pthread with ws2_32 on Windows
• Implement Windows-compatible sockaddr_storage using winapi
• Add Windows versions of socket_addr_to_storage and sockaddr_storage_to_socket_addr
• Update all server/client code to use platform-agnostic SockaddrStorage type
• Add IPv6→IPv4 fallback for UDP socket binding (common on Windows)

I test and build the changes in https://github.com/AliRezaBeigy/slipstream-rust-deploy

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: fd96c36d12

ℹ️ About Codex in GitHub

Codex has been enabled to automatically review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

When you sign up for Codex through ChatGPT, Codex can also answer questions or update the PR, like "@codex address that feedback".

[Copilot]

Pull request overview

This pull request adds comprehensive Windows support to the Slipstream QUIC proxy by implementing platform-specific socket type handling, fixing OpenSSL linking, and adding IPv6 to IPv4 fallback for UDP socket binding.

Changes:

• Added Windows-compatible socket type abstractions using winapi crate with conditional compilation
• Updated OpenSSL and pthread library linking to use Windows-appropriate libraries (libssl/libcrypto and ws2_32)
• Implemented IPv6→IPv4 fallback for UDP socket binding to handle Windows systems without IPv6 support

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
crates/slipstream-ffi/Cargo.toml	Adds winapi dependency for Windows socket types
crates/slipstream-ffi/build.rs	Conditionally links OpenSSL libraries (libssl/libcrypto on Windows) and replaces pthread with ws2_32 on Windows
crates/slipstream-ffi/src/runtime.rs	Implements Windows-compatible SockaddrStorage type alias and socket conversion functions using winapi structures
crates/slipstream-ffi/src/picoquic.rs	Updates imports to use Windows socket types conditionally
crates/slipstream-ffi/src/lib.rs	Exports SockaddrStorage type for use by other crates
crates/slipstream-server/src/udp_fallback.rs	Updates type signatures and test helper to use platform-agnostic SockaddrStorage
crates/slipstream-server/src/server.rs	Updates socket address storage variables to use SockaddrStorage type
crates/slipstream-client/src/runtime/setup.rs	Adds IPv6 to IPv4 fallback for UDP socket binding
crates/slipstream-client/src/runtime/path.rs	Updates socket address storage to use SockaddrStorage type
crates/slipstream-client/src/runtime.rs	Updates socket address storage variables to use SockaddrStorage type
crates/slipstream-client/src/dns/response.rs	Updates type signature to use SockaddrStorage
crates/slipstream-client/src/dns/resolver.rs	Updates struct fields and function signatures to use SockaddrStorage
crates/slipstream-client/src/dns/poll.rs	Updates socket address storage variables to use SockaddrStorage type
crates/slipstream-client/src/dns/path.rs	Updates socket address storage variable to use SockaddrStorage type

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[AliRezaBeigy]

Sorry for the late reply, I need more time to manage the test and copilot. Before that I have to manage picoquic. I will create a pr for that too.

[AliRezaBeigy]

picoquic compatibility change pull request created PR, I suggest merging that before this.
@Mygod could you please approve the workflow

[Mygod]

Hi I have limited bandwidth so it will be a while until I get to this. Thanks for the patience. :)

[AliRezaBeigy]

Branch has been rebased and all tests have passed successfully. However, this branch requires Mygod/slipstream-picoquic#1 to achieve full Windows compatibility. Please take a look that PR first if you find time.

[AliRezaBeigy]

@Mygod, I think the problem is that I switch to bash in the code, and in Windows, when I run a bash command, it's looking for WSL if the bash doesn't exist. I suggest two solutions: 1. Install bash; 2. Revert that forced bash shell (I didn't recommend because I faced some errors in PowerShell while building).

[AliRezaBeigy]

Here I switch to bash.

[Mygod]

Ok please fix CI for me to review. ;)

[AliRezaBeigy]

@Mygod Everything in here is good now.
Note: I use openssl-vendored to avoid errors like "The code execution cannot proceed because libcrypto-3-x64.dll was not found."

[Mygod]

Vendored is too slow. No chance using precompiled?

[AliRezaBeigy]

Installing openssl in windows is taking same time as vendored build time and with prebuild openssl user require to install the openssl when they want to use it.

[Mygod]

I'm asking for CI.

[AliRezaBeigy]

Let's try it. Give me a moment.

[AliRezaBeigy]

I thought I needed to install openssl with choco that takes too much time, but I was wrong.

[Mygod]

As mentioned at Mygod/slipstream-picoquic#1 (comment), every picoquic change must be as minimal as possible since we need to account for future updates to the library. If a change can be justified in a context outside of slipstream, then the PR should be opened upstream to private-octopus's repo.