refactor: 获取远程目的从tunnel中剔除，移至tracker

tunnel/statistic/tracker.go

@@ -59,6 +59,7 @@ func (tt *tcpTracker) Close() error {
 
 func NewTCPTracker(conn C.Conn, manager *Manager, metadata *C.Metadata, rule C.Rule) *tcpTracker {
 	uuid, _ := uuid.NewV4()
+	metadata.RemoteDst = conn.RemoteDestination()
 
 	t := &tcpTracker{
 		Conn:    conn,
@@ -116,6 +117,7 @@ func (ut *udpTracker) Close() error {
 
 func NewUDPTracker(conn C.PacketConn, manager *Manager, metadata *C.Metadata, rule C.Rule) *udpTracker {
 	uuid, _ := uuid.NewV4()
+	metadata.RemoteDst = conn.RemoteDestination()
 
 	ut := &udpTracker{
 		PacketConn: conn,

tunnel/tunnel.go

@@ -9,7 +9,6 @@ import (
 	"path/filepath"
 	"runtime"
 	"strconv"
-	"strings"
 	"sync"
 	"time"
 
@@ -288,15 +287,6 @@ func handleUDPConn(packet *inbound.PacketAdapter) {
 		}
 		pCtx.InjectPacketConn(rawPc)
 
-		addr := rawPc.RemoteDestination()
-		if dst, _, err := net.SplitHostPort(addr); err == nil {
-			metadata.RemoteDst = dst
-		} else {
-			if addrError, ok := err.(*net.AddrError); ok && strings.Contains(addrError.Err, "missing port") {
-				metadata.RemoteDst = addr
-			}
-		}
-
 		pc := statistic.NewUDPTracker(rawPc, statistic.DefaultManager, metadata, rule)
 
 		switch true {
@@ -359,10 +349,6 @@ func handleTCPConn(connCtx C.ConnContext) {
 		return
 	}
 
-	if tcpAddr, ok := remoteConn.RemoteAddr().(*net.TCPAddr); ok {
-		metadata.RemoteDst = tcpAddr.IP.String()
-	}
-
 	remoteConn = statistic.NewTCPTracker(remoteConn, statistic.DefaultManager, metadata, rule)
 	defer func(remoteConn C.Conn) {
 		_ = remoteConn.Close()