Chore: dialer hook should return a error

component/dialer/dialer.go

@@ -8,22 +8,26 @@ import (
 	"github.com/Dreamacro/clash/component/resolver"
 )
 
-func Dialer() *net.Dialer {
+func Dialer() (*net.Dialer, error) {
 	dialer := &net.Dialer{}
 	if DialerHook != nil {
-		DialerHook(dialer)
+		if err := DialerHook(dialer); err != nil {
+			return nil, err
+		}
 	}
 
-	return dialer
+	return dialer, nil
 }
 
-func ListenConfig() *net.ListenConfig {
+func ListenConfig() (*net.ListenConfig, error) {
 	cfg := &net.ListenConfig{}
 	if ListenConfigHook != nil {
-		ListenConfigHook(cfg)
+		if err := ListenConfigHook(cfg); err != nil {
+			return nil, err
+		}
 	}
 
-	return cfg
+	return cfg, nil
 }
 
 func Dial(network, address string) (net.Conn, error) {
@@ -38,7 +42,10 @@ func DialContext(ctx context.Context, network, address string) (net.Conn, error)
 			return nil, err
 		}
 
-		dialer := Dialer()
+		dialer, err := Dialer()
+		if err != nil {
+			return nil, err
+		}
 
 		var ip net.IP
 		switch network {
@@ -53,7 +60,9 @@ func DialContext(ctx context.Context, network, address string) (net.Conn, error)
 		}
 
 		if DialHook != nil {
-			DialHook(dialer, network, ip)
+			if err := DialHook(dialer, network, ip); err != nil {
+				return nil, err
+			}
 		}
 		return dialer.DialContext(ctx, network, net.JoinHostPort(ip.String(), port))
 	case "tcp", "udp":
@@ -64,13 +73,17 @@ func DialContext(ctx context.Context, network, address string) (net.Conn, error)
 }
 
 func ListenPacket(network, address string) (net.PacketConn, error) {
-	lc := ListenConfig()
+	lc, err := ListenConfig()
+	if err != nil {
+		return nil, err
+	}
 
 	if ListenPacketHook != nil && address == "" {
-		ip := ListenPacketHook()
+		ip, err := ListenPacketHook()
-		if ip != nil {
+		if err != nil {
-			address = net.JoinHostPort(ip.String(), "0")
+			return nil, err
 		}
+		address = net.JoinHostPort(ip.String(), "0")
 	}
 	return lc.ListenPacket(context.Background(), network, address)
 }
@@ -95,7 +108,6 @@ func dualStackDailContext(ctx context.Context, network, address string) (net.Con
 	var primary, fallback dialResult
 
 	startRacer := func(ctx context.Context, network, host string, ipv6 bool) {
-		dialer := Dialer()
 		result := dialResult{ipv6: ipv6, done: true}
 		defer func() {
 			select {
@@ -107,6 +119,12 @@ func dualStackDailContext(ctx context.Context, network, address string) (net.Con
 			}
 		}()
 
+		dialer, err := Dialer()
+		if err != nil {
+			result.error = err
+			return
+		}
+
 		var ip net.IP
 		if ipv6 {
 			ip, result.error = resolver.ResolveIPv6(host)
@@ -119,7 +137,9 @@ func dualStackDailContext(ctx context.Context, network, address string) (net.Con
 		result.resolved = true
 
 		if DialHook != nil {
-			DialHook(dialer, network, ip)
+			if result.error = DialHook(dialer, network, ip); result.error != nil {
+				return
+			}
 		}
 		result.Conn, result.error = dialer.DialContext(ctx, network, net.JoinHostPort(ip.String(), port))
 	}

component/dialer/hook.go

@@ -8,10 +8,10 @@ import (
 	"github.com/Dreamacro/clash/common/singledo"
 )
 
-type DialerHookFunc = func(dialer *net.Dialer)
+type DialerHookFunc = func(dialer *net.Dialer) error
-type DialHookFunc = func(dialer *net.Dialer, network string, ip net.IP)
+type DialHookFunc = func(dialer *net.Dialer, network string, ip net.IP) error
-type ListenConfigHookFunc = func(*net.ListenConfig)
+type ListenConfigHookFunc = func(*net.ListenConfig) error
-type ListenPacketHookFunc = func() net.IP
+type ListenPacketHookFunc = func() (net.IP, error)
 
 var (
 	DialerHook       DialerHookFunc
@@ -70,7 +70,7 @@ func lookupUDPAddr(ip net.IP, addrs []net.Addr) (*net.UDPAddr, error) {
 func ListenPacketWithInterface(name string) ListenPacketHookFunc {
 	single := singledo.NewSingle(5 * time.Second)
 
-	return func() net.IP {
+	return func() (net.IP, error) {
 		elm, err, _ := single.Do(func() (interface{}, error) {
 			iface, err := net.InterfaceByName(name)
 			if err != nil {
@@ -86,7 +86,7 @@ func ListenPacketWithInterface(name string) ListenPacketHookFunc {
 		})
 
 		if err != nil {
-			return nil
+			return nil, err
 		}
 
 		addrs := elm.([]net.Addr)
@@ -97,17 +97,17 @@ func ListenPacketWithInterface(name string) ListenPacketHookFunc {
 				continue
 			}
 
-			return addr.IP
+			return addr.IP, nil
 		}
 
-		return nil
+		return nil, ErrAddrNotFound
 	}
 }
 
 func DialerWithInterface(name string) DialHookFunc {
 	single := singledo.NewSingle(5 * time.Second)
 
-	return func(dialer *net.Dialer, network string, ip net.IP) {
+	return func(dialer *net.Dialer, network string, ip net.IP) error {
 		elm, err, _ := single.Do(func() (interface{}, error) {
 			iface, err := net.InterfaceByName(name)
 			if err != nil {
@@ -123,7 +123,7 @@ func DialerWithInterface(name string) DialHookFunc {
 		})
 
 		if err != nil {
-			return
+			return err
 		}
 
 		addrs := elm.([]net.Addr)
@@ -132,11 +132,17 @@ func DialerWithInterface(name string) DialHookFunc {
 		case "tcp", "tcp4", "tcp6":
 			if addr, err := lookupTCPAddr(ip, addrs); err == nil {
 				dialer.LocalAddr = addr
+			} else {
+				return err
 			}
 		case "udp", "udp4", "udp6":
 			if addr, err := lookupUDPAddr(ip, addrs); err == nil {
 				dialer.LocalAddr = addr
+			} else {
+				return err
 			}
 		}
+
+		return nil
 	}
 }

dns/client.go

@@ -34,13 +34,19 @@ func (c *client) ExchangeContext(ctx context.Context, m *D.Msg) (msg *D.Msg, err
 		}
 	}
 
-	d := dialer.Dialer()
+	d, err := dialer.Dialer()
+	if err != nil {
+		return nil, err
+	}
+
 	if dialer.DialHook != nil {
 		network := "udp"
 		if strings.HasPrefix(c.Client.Net, "tcp") {
 			network = "tcp"
 		}
-		dialer.DialHook(d, network, ip)
+		if err := dialer.DialHook(d, network, ip); err != nil {
+			return nil, err
+		}
 	}
 
 	c.Client.Dialer = d