chore: better bind in windows

component/dialer/bind_windows.go

@@ -0,0 +1,88 @@
+package dialer
+
+import (
+	"encoding/binary"
+	"net"
+	"net/netip"
+	"syscall"
+	"unsafe"
+
+	"github.com/Dreamacro/clash/component/iface"
+)
+
+const (
+	IP_UNICAST_IF   = 31
+	IPV6_UNICAST_IF = 31
+)
+
+func bind4(handle syscall.Handle, ifaceIdx int) error {
+	var bytes [4]byte
+	binary.BigEndian.PutUint32(bytes[:], uint32(ifaceIdx))
+	idx := *(*uint32)(unsafe.Pointer(&bytes[0]))
+	return syscall.SetsockoptInt(handle, syscall.IPPROTO_IP, IP_UNICAST_IF, int(idx))
+}
+
+func bind6(handle syscall.Handle, ifaceIdx int) error {
+	return syscall.SetsockoptInt(handle, syscall.IPPROTO_IPV6, IPV6_UNICAST_IF, ifaceIdx)
+}
+
+type controlFn = func(network, address string, c syscall.RawConn) error
+
+func bindControl(ifaceIdx int, chain controlFn) controlFn {
+	return func(network, address string, c syscall.RawConn) (err error) {
+		defer func() {
+			if err == nil && chain != nil {
+				err = chain(network, address, c)
+			}
+		}()
+
+		addrPort, err := netip.ParseAddrPort(address)
+		if err == nil && !addrPort.Addr().IsGlobalUnicast() {
+			return
+		}
+
+		var innerErr error
+		err = c.Control(func(fd uintptr) {
+			handle := syscall.Handle(fd)
+			switch network {
+			case "tcp6", "udp6":
+				innerErr = bind6(handle, ifaceIdx)
+				_ = bind4(handle, ifaceIdx)
+			default:
+				innerErr = bind4(handle, ifaceIdx)
+				// try bind ipv6, if failed, ignore. it's a workaround for windows disable interface ipv6
+				_ = bind6(handle, ifaceIdx)
+			}
+		})
+
+		if innerErr != nil {
+			err = innerErr
+		}
+
+		return
+	}
+}
+
+func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, _ string, _ netip.Addr) error {
+	ifaceObj, err := iface.ResolveInterface(ifaceName)
+	if err != nil {
+		return err
+	}
+
+	dialer.Control = bindControl(ifaceObj.Index, dialer.Control)
+	return nil
+}
+
+func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, _, address string) (string, error) {
+	ifaceObj, err := iface.ResolveInterface(ifaceName)
+	if err != nil {
+		return "", err
+	}
+
+	lc.Control = bindControl(ifaceObj.Index, lc.Control)
+	return address, nil
+}
+
+func ParseNetwork(network string, addr netip.Addr) string {
+	return network
+}