From 59b86002c4ef499d787ecdd3a64348ec76575883 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Mon, 7 Aug 2023 15:26:26 +0800
Subject: [PATCH] Add no route event

---
 monitor.go        | 5 +++--
 monitor_shared.go | 7 ++++++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/monitor.go b/monitor.go
index 910570a..327eff5 100644
--- a/monitor.go
+++ b/monitor.go
@@ -15,8 +15,9 @@ type (
 )
 
 const (
-	EventInterfaceUpdate  = 1
-	EventAndroidVPNUpdate = 2
+	EventInterfaceUpdate = iota
+	EventAndroidVPNUpdate
+	EventNoRoute
 )
 
 type NetworkUpdateMonitor interface {
diff --git a/monitor_shared.go b/monitor_shared.go
index dbd18c5..f6460d4 100644
--- a/monitor_shared.go
+++ b/monitor_shared.go
@@ -4,6 +4,7 @@ package tun
 
 import (
 	"context"
+	"errors"
 	"net"
 	"net/netip"
 	"sync"
@@ -84,7 +85,11 @@ func (m *defaultInterfaceMonitor) delayCheckUpdate() error {
 	if err != nil {
 		m.networkMonitor.NewError(context.Background(), E.Cause(err, "update interfaces"))
 	}
-	return m.checkUpdate()
+	err = m.checkUpdate()
+	if errors.Is(err, ErrNoRoute) {
+		m.emit(EventNoRoute)
+	}
+	return err
 }
 
 func (m *defaultInterfaceMonitor) updateInterfaces() error {