update hijackDNS

cmd/main.go

@@ -139,11 +139,11 @@ func main() {
 	lwipWriter = filter.NewICMPFilter(lwipWriter).(io.Writer)
 
 	// Register modules to proxy
-	proxy.RegisterFakeDNS(fakeDNS)
 	proxy.RegisterMonitor(monitor)
+	proxy.RegisterFakeDNS(fakeDNS, *args.HijackDNS)
 	// Register TCP and UDP handlers to handle accepted connections.
 	core.RegisterTCPConnHandler(proxy.NewTCPHandler(proxyHost, proxyPort))
-	core.RegisterUDPConnHandler(proxy.NewUDPHandler(proxyHost, proxyPort, *args.UdpTimeout, *args.HijackDNS))
+	core.RegisterUDPConnHandler(proxy.NewUDPHandler(proxyHost, proxyPort, *args.UdpTimeout))
 
 	// Register an output callback to write packets output from lwip stack to tun
 	// device, output function should be set before input any packets.

proxy/proxy.go

@@ -3,24 +3,62 @@ package proxy
 import (
 	"errors"
 	"net"
+	"strconv"
+	"strings"
 
 	D "github.com/xjasonlyu/tun2socks/component/fakedns"
 	S "github.com/xjasonlyu/tun2socks/component/session"
 )
 
 var (
-	fakeDNS D.FakeDNS
 	monitor S.Monitor
+
+	fakeDNS   D.FakeDNS
+	hijackDNS []string
 )
 
-func RegisterFakeDNS(d D.FakeDNS) {
-	fakeDNS = d
-}
-
+// Register Monitor
 func RegisterMonitor(m S.Monitor) {
 	monitor = m
 }
 
+// Session Operation
+func addSession(key interface{}, session *S.Session) {
+	if monitor != nil {
+		monitor.AddSession(key, session)
+	}
+}
+
+func removeSession(key interface{}) {
+	if monitor != nil {
+		monitor.RemoveSession(key)
+	}
+}
+
+// Register FakeDNS
+func RegisterFakeDNS(d D.FakeDNS, h string) {
+	fakeDNS = d
+	hijackDNS = strings.Split(h, ",")
+}
+
+// Check target if is hijacked address.
+func isHijacked(target *net.UDPAddr) bool {
+	if hijackDNS == nil {
+		return false
+	}
+	for _, addr := range hijackDNS {
+		host, port, err := net.SplitHostPort(addr)
+		if err != nil {
+			continue
+		}
+		portInt, _ := strconv.Atoi(port)
+		if (host == "*" && portInt == target.Port) || addr == target.String() {
+			return true
+		}
+	}
+	return false
+}
+
 // DNS lookup
 func lookupHost(target net.Addr) (targetHost string, err error) {
 	var targetIP net.IP
@@ -43,16 +81,3 @@ func lookupHost(target net.Addr) (targetHost string, err error) {
 	}
 	return
 }
-
-// Session Operation
-func addSession(key interface{}, session *S.Session) {
-	if monitor != nil {
-		monitor.AddSession(key, session)
-	}
-}
-
-func removeSession(key interface{}) {
-	if monitor != nil {
-		monitor.RemoveSession(key)
-	}
-}

proxy/udp.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"net"
 	"strconv"
-	"strings"
 	"sync"
 	"time"
 
@@ -19,37 +18,20 @@ import (
 type udpHandler struct {
 	proxyHost string
 	proxyPort int
-
 	timeout   time.Duration
-	hijackDNS []string
 
 	remoteAddrMap sync.Map
 	remoteConnMap sync.Map
 }
 
-func NewUDPHandler(proxyHost string, proxyPort int, timeout time.Duration, hijackDNS string) core.UDPConnHandler {
+func NewUDPHandler(proxyHost string, proxyPort int, timeout time.Duration) core.UDPConnHandler {
 	return &udpHandler{
 		proxyHost: proxyHost,
 		proxyPort: proxyPort,
 		timeout:   timeout,
-		hijackDNS: strings.Split(hijackDNS, ","),
 	}
 }
 
-func (h *udpHandler) isHijacked(target *net.UDPAddr) bool {
-	for _, addr := range h.hijackDNS {
-		host, port, err := net.SplitHostPort(addr)
-		if err != nil {
-			continue
-		}
-		portInt, _ := strconv.Atoi(port)
-		if (host == "*" && portInt == target.Port) || addr == target.String() {
-			return true
-		}
-	}
-	return false
-}
-
 func (h *udpHandler) fetchUDPInput(conn core.UDPConn, input net.PacketConn, addr *net.UDPAddr) {
 	buf := pool.BufPool.Get().([]byte)
 
@@ -77,7 +59,7 @@ func (h *udpHandler) fetchUDPInput(conn core.UDPConn, input net.PacketConn, addr
 
 func (h *udpHandler) Connect(conn core.UDPConn, target *net.UDPAddr) error {
 	// Check hijackDNS
-	if h.isHijacked(target) {
+	if isHijacked(target) {
 		return nil
 	}
 
@@ -132,7 +114,7 @@ func (h *udpHandler) ReceiveTo(conn core.UDPConn, data []byte, addr *net.UDPAddr
 	}()
 
 	// Check hijackDNS
-	if h.isHijacked(addr) {
+	if isHijacked(addr) {
 		resp, err := fakeDNS.Resolve(data)
 		if err != nil {
 			return fmt.Errorf("hijack DNS request error: %v", err)