feat: add override-destination for sniffer

constant/metadata.go

@@ -134,6 +134,8 @@ type Metadata struct {
 	SpecialProxy string     `json:"specialProxy"`
 	SpecialRules string     `json:"specialRules"`
 	RemoteDst    string     `json:"remoteDestination"`
+	// Only domain rule
+	SniffHost 	 string
 }
 
 func (m *Metadata) RemoteAddress() string {
@@ -176,6 +178,14 @@ func (m *Metadata) Resolved() bool {
 	return m.DstIP.IsValid()
 }
 
+func (m *Metadata) RuleHost() string {
+	if len(m.SniffHost) == 0 {
+		return m.Host
+	} else {
+		return m.SniffHost
+	}
+}
+
 // Pure is used to solve unexpected behavior
 // when dialing proxy connection in DNSMapping mode.
 func (m *Metadata) Pure() *Metadata {