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Embeddable WireGuard Tunnel Library

This allows embedding WireGuard as a service inside of another application. Build tunnel.dll by running ./build.bat in this folder. The first time you run it, it will invoke ..\build.bat simply for downloading dependencies. After, you should have amd64/tunnel.dll, x86/tunnel.dll, and arm64/tunnel.dll. In addition, tunnel.dll requires wireguard.dll, which can be downloaded from the wireguard-nt download server.

The basic setup to use tunnel.dll is:

1. Install a service with these parameters:
Service Name:  "WireGuardTunnel$SomeTunnelName"
Display Name:  "Some Service Name"
Service Type:  SERVICE_WIN32_OWN_PROCESS
Start Type:    StartAutomatic
Error Control: ErrorNormal,
Dependencies:  [ "Nsi", "TcpIp" ]
Sid Type:      SERVICE_SID_TYPE_UNRESTRICTED
Executable:    "C:\path\to\example\vpnclient.exe /service configfile.conf"

Some of these may have to be changed with ChangeServiceConfig2 after the initial call to CreateService The SERVICE_SID_TYPE_UNRESTRICTED parameter is absolutely essential; do not forget it.

2. Have your program's main function handle the /service switch:
if (!wcscmp(wargv[1], L"/service") && wargc == 3) {
    HMODULE tunnel_lib = LoadLibrary("tunnel.dll");
    if (!tunnel_lib)
        abort();
    tunnel_proc_t tunnel_proc = (tunnel_proc_t)GetProcAddress(tunnel_lib, "WireGuardTunnelService");
    if (!tunnel_proc)
        abort();
    return tunnel_proc(wargv[2]);
}
3. Scoop up logs by implementing a ringlogger format reader.

There is a sample implementation of bits and pieces of this inside of the csharp\ directory.