Evgeny 15b670e563 Add cross-platform TUN support with Wintun for Windows ...

- Split TUN implementation into platform-specific files:
  - tun_if.c: Common code (queues, callbacks, statistics)
  - tun_linux.c: Linux TUN/TAP implementation (/dev/net/tun + ioctl)
  - tun_windows.c: Windows Wintun implementation (wintun.dll + IP Helper)

- Update tun_if.h with platform abstraction layer:
  - tun_platform_init/cleanup/read/write/get_poll_fd
  - Platform handles: fd (Linux), WINTUN handles (Windows)

- Windows implementation features:
  - Dynamic loading of wintun.dll with graceful error handling
  - IP Helper API for IP address and MTU configuration
  - HANDLE-based uasync integration
  - Clear error message if wintun.dll is not found

- Update build system:
  - configure.ac: Detect Windows (mingw/msys/cygwin)
  - src/Makefile.am: Conditional compilation of tun_linux/tun_windows
  - tests/Makefile.am: Link platform-specific TUN objects

- Add wintun.dll and wintun.h to lib/ directory
- All 22 tests pass on Linux
- Ready for MSYS2 UCRT64 Windows build

2026-02-15 01:40:17 +03:00

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