Router: Add localIP and localPort; Add sourceIP as an alias of source (#4992)

https://github.com/XTLS/Xray-core/discussions/4984#discussioncomment-13990687

Closes https://github.com/XTLS/Xray-core/issues/4993

features/routing/context.go

@@ -23,6 +23,12 @@ type Context interface {
 	// GetTargetPort returns the target port of the connection.
 	GetTargetPort() net.Port
 
+	// GetLocalIPs returns the local IPs bound to the connection.
+	GetLocalIPs() []net.IP
+
+	// GetLocalPort returns the local port of the connection.
+	GetLocalPort() net.Port
+
 	// GetTargetDomain returns the target domain of the connection, if exists.
 	GetTargetDomain() string
 

features/routing/session/context.go

@@ -28,12 +28,13 @@ func (ctx *Context) GetSourceIPs() []net.IP {
 	if ctx.Inbound == nil || !ctx.Inbound.Source.IsValid() {
 		return nil
 	}
-	dest := ctx.Inbound.Source
-	if dest.Address.Family().IsDomain() {
-		return nil
+
+	if ctx.Inbound.Source.Address.Family().IsIP() {
+		return []net.IP{ctx.Inbound.Source.Address.IP()}
 	}
 
-	return []net.IP{dest.Address.IP()}
+	return nil
+
 }
 
 // GetSourcePort implements routing.Context.
@@ -65,6 +66,27 @@ func (ctx *Context) GetTargetPort() net.Port {
 	return ctx.Outbound.Target.Port
 }
 
+// GetLocalIPs implements routing.Context.
+func (ctx *Context) GetLocalIPs() []net.IP {
+	if ctx.Inbound == nil || !ctx.Inbound.Local.IsValid() {
+		return nil
+	}
+
+	if ctx.Inbound.Local.Address.Family().IsIP() {
+		return []net.IP{ctx.Inbound.Local.Address.IP()}
+	}
+
+	return nil
+}
+
+// GetLocalPort implements routing.Context.
+func (ctx *Context) GetLocalPort() net.Port {
+	if ctx.Inbound == nil || !ctx.Inbound.Local.IsValid() {
+		return 0
+	}
+	return ctx.Inbound.Local.Port
+}
+
 // GetTargetDomain implements routing.Context.
 func (ctx *Context) GetTargetDomain() string {
 	if ctx.Outbound == nil || !ctx.Outbound.Target.IsValid() {