nym/nym-connect/native/ios

Socks5-c

Setting up dummy socks5 client in iOS (from scratch)

Based on https://mozilla.github.io/firefox-browser-architecture/experiments/2017-09-06-rust-on-ios.html

1. Install xcode, iOS simulator, etc. (xcode-select --install)
2. add rust targets: rustup target add aarch64-apple-ios x86_64-apple-ios
3. get cargo-lipo: cargo install cargo-lipo
4. build our library file. From inside cargo run cargo lipo --release
5. go to General tab of the xcode project setting and under Linked Frameworks and Libraries import /cargo/target/universal/release/libsocks5_c.a
6. link libresolv.tbd: in Linked Frameworks and Libraries search for and select libresolv.tbd
7. import socks5_c.h header file into the project: File -> Add Files to "..."
8. create bridging header: make new Socks5-Bridging-Header.h file and put the following inside:

    #ifndef Greetings_Bridging_Header_h
    #define Greetings_Bridging_Header_h
    
    #import "socks5_c.h"
    
    #endif

9. tell xcode about the bridging header: go to Build Settings tab and set Objective-C Bridging Header to $(PROJECT_DIR)/Socks5/Socks5-Bridging-Header.h
10. tell xcode where to look for libraries for linking: go to Build Settings tab and amend the Library Search Paths option value to $(PROJECT_DIR)/../../cargo/target/universal/release
11. create a swift file to actually call our code (RustSocks5.swift)

// this is an example

class RustSocks5 {
    func runForever(serviceProvider: String) {
        run_client(serviceProvider)
    }
}
 

12. call the new code however you want. I did it by setting onAppear:

struct ContentView: View {
    var body: some View {
        VStack {
            Image(systemName: "globe")
                .imageScale(.large)
                .foregroundColor(.accentColor)
            Text("Hello, world!")
        }
        .padding()
        .onAppear{
            let rustSocks5 = RustSocks5()
            rustSocks5.runForever(serviceProvider: "my-service-provider-address")
        }
    }
}

13. note: the above requires passing a service provider address. The easiest (for testing) would be to just run a local network requester with open proxy and passing that address.
14. fix iOS simulator: go to Build Settings and add Any iOS Simulator SDK with value arm64 inside Excluded Architecture.
15. start the simulator!
16. test it by sending some request, like curl -x socks5h://127.0.0.1:1080 https://nymtech.net