libtailscale is a C library that embeds Tailscale into a process.
Use this library to compile Tailscale into your program and get an IP address on a tailnet, entirely from userspace.
With the latest version of Go, run:
go build -buildmode=c-archive
This will produce a libtailscale.a file. Link it into your binary, and use the tailscale.h header to reference it.
libtailscale.a
tailscale.h
It is also possible to build a shared library using
go build -buildmode=c-shared
Please file any issues about this code or the hosted service on the issue tracker.