fix: dhcp not working on windows

component/dialer/bind.go

@@ -3,6 +3,7 @@ package dialer
 import (
 	"net"
 	"net/netip"
+	"strconv"
 	"strings"
 
 	"github.com/Dreamacro/clash/component/iface"
@@ -49,3 +50,52 @@ func LookupLocalAddrFromIfaceName(ifaceName string, network string, destination
 
 	return nil, iface.ErrAddrNotFound
 }
+
+func fallbackBindIfaceToDialer(ifaceName string, dialer *net.Dialer, network string, destination netip.Addr) error {
+	if !destination.IsGlobalUnicast() {
+		return nil
+	}
+
+	local := uint64(0)
+	if dialer.LocalAddr != nil {
+		_, port, err := net.SplitHostPort(dialer.LocalAddr.String())
+		if err == nil {
+			local, _ = strconv.ParseUint(port, 10, 16)
+		}
+	}
+
+	addr, err := LookupLocalAddrFromIfaceName(ifaceName, network, destination, int(local))
+	if err != nil {
+		return err
+	}
+
+	dialer.LocalAddr = addr
+
+	return nil
+}
+
+func fallbackBindIfaceToListenConfig(ifaceName string, _ *net.ListenConfig, network, address string) (string, error) {
+	_, port, err := net.SplitHostPort(address)
+	if err != nil {
+		port = "0"
+	}
+
+	local, _ := strconv.ParseUint(port, 10, 16)
+
+	addr, err := LookupLocalAddrFromIfaceName(ifaceName, network, netip.Addr{}, int(local))
+	if err != nil {
+		return "", err
+	}
+
+	return addr.String(), nil
+}
+
+func fallbackParseNetwork(network string, addr netip.Addr) string {
+	// fix fallbackBindIfaceToListenConfig() force bind to an ipv4 address
+	if !strings.HasSuffix(network, "4") &&
+		!strings.HasSuffix(network, "6") &&
+		addr.Unmap().Is6() {
+		network += "6"
+	}
+	return network
+}