fix: dhcp not working on windows

component/dhcp/conn.go

@@ -14,5 +14,15 @@ func ListenDHCPClient(ctx context.Context, ifaceName string) (net.PacketConn, er
 		listenAddr = "255.255.255.255:68"
 	}
 
-	return dialer.ListenPacket(ctx, "udp4", listenAddr, dialer.WithInterface(ifaceName), dialer.WithAddrReuse(true))
+	options := []dialer.Option{
+		dialer.WithInterface(ifaceName),
+		dialer.WithAddrReuse(true),
+	}
+
+	// fallback bind on windows, because syscall bind can not receive broadcast
+	if runtime.GOOS == "windows" {
+		options = append(options, dialer.WithFallbackBind(true))
+	}
+
+	return dialer.ListenPacket(ctx, "udp4", listenAddr, options...)
 }

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
+}

component/dialer/bind_others.go

@@ -5,55 +5,16 @@ package dialer
 import (
 	"net"
 	"net/netip"
-	"strconv"
-	"strings"
 )
 
 func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, network string, destination netip.Addr) error {
-	if !destination.IsGlobalUnicast() {
+	return fallbackBindIfaceToDialer(ifaceName, dialer, network, destination)
-		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 bindIfaceToListenConfig(ifaceName string, _ *net.ListenConfig, network, address string) (string, error) {
+func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, network, address string) (string, error) {
-	_, port, err := net.SplitHostPort(address)
+	return fallbackBindIfaceToListenConfig(ifaceName, lc, network, 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 ParseNetwork(network string, addr netip.Addr) string {
-	// fix bindIfaceToListenConfig() force bind to an ipv4 address
+	return fallbackParseNetwork(network, addr)
-	if !strings.HasSuffix(network, "4") &&
-		!strings.HasSuffix(network, "6") &&
-		addr.Unmap().Is6() {
-		network += "6"
-	}
-	return network
 }

component/dialer/dialer.go

@@ -74,7 +74,11 @@ func ListenPacket(ctx context.Context, network, address string, options ...Optio
 
 	lc := &net.ListenConfig{}
 	if cfg.interfaceName != "" {
-		addr, err := bindIfaceToListenConfig(cfg.interfaceName, lc, network, address)
+		bind := bindIfaceToListenConfig
+		if cfg.fallbackBind {
+			bind = fallbackBindIfaceToListenConfig
+		}
+		addr, err := bind(cfg.interfaceName, lc, network, address)
 		if err != nil {
 			return nil, err
 		}
@@ -125,7 +129,11 @@ func dialContext(ctx context.Context, network string, destination netip.Addr, po
 
 	dialer := netDialer.(*net.Dialer)
 	if opt.interfaceName != "" {
-		if err := bindIfaceToDialer(opt.interfaceName, dialer, network, destination); err != nil {
+		bind := bindIfaceToDialer
+		if opt.fallbackBind {
+			bind = fallbackBindIfaceToDialer
+		}
+		if err := bind(opt.interfaceName, dialer, network, destination); err != nil {
 			return nil, err
 		}
 	}

component/dialer/options.go

@@ -20,6 +20,7 @@ type NetDialer interface {
 
 type option struct {
 	interfaceName string
+	fallbackBind  bool
 	addrReuse     bool
 	routingMark   int
 	network       int
@@ -38,6 +39,12 @@ func WithInterface(name string) Option {
 	}
 }
 
+func WithFallbackBind(fallback bool) Option {
+	return func(opt *option) {
+		opt.fallbackBind = fallback
+	}
+}
+
 func WithAddrReuse(reuse bool) Option {
 	return func(opt *option) {
 		opt.addrReuse = reuse

dns/util.go

@@ -280,7 +280,7 @@ func listenPacket(ctx context.Context, proxyAdapter C.ProxyAdapter, proxyName st
 		DstPort: uint16(uintPort),
 	}
 	if proxyAdapter == nil {
-		return dialer.NewDialer(opts...).ListenPacket(ctx, dialer.ParseNetwork(network, dstIP), "", netip.AddrPortFrom(metadata.DstIP, metadata.DstPort))
+		return dialer.NewDialer(opts...).ListenPacket(ctx, network, "", netip.AddrPortFrom(metadata.DstIP, metadata.DstPort))
 	}
 
 	if !proxyAdapter.SupportUDP() {