From e4cdea2111d3bfa8608b36ab741d9610ad10f949 Mon Sep 17 00:00:00 2001
From: Dreamacro <8615343+Dreamacro@users.noreply.github.com>
Date: Wed, 13 Jan 2021 17:30:54 +0800
Subject: [PATCH] chore: use singleDo to get interface info

---
 component/dialer/bind.go        | 18 ++++++++++++++----
 component/dialer/bind_darwin.go | 14 ++++++++------
 2 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/component/dialer/bind.go b/component/dialer/bind.go
index 55e5f163..0ad52068 100644
--- a/component/dialer/bind.go
+++ b/component/dialer/bind.go
@@ -3,8 +3,14 @@ package dialer
 import (
 	"errors"
 	"net"
+	"time"
+
+	"github.com/Dreamacro/clash/common/singledo"
 )
 
+// In some OS, such as Windows, it takes a little longer to get interface information
+var ifaceSingle = singledo.NewSingle(time.Second * 20)
+
 var (
 	errPlatformNotSupport = errors.New("unsupport platform")
 )
@@ -56,12 +62,14 @@ func fallbackBindToDialer(dialer *net.Dialer, network string, ip net.IP, name st
 		return nil
 	}
 
-	iface, err := net.InterfaceByName(name)
+	iface, err, _ := ifaceSingle.Do(func() (interface{}, error) {
+		return net.InterfaceByName(name)
+	})
 	if err != nil {
 		return err
 	}
 
-	addrs, err := iface.Addrs()
+	addrs, err := iface.(*net.Interface).Addrs()
 	if err != nil {
 		return err
 	}
@@ -85,12 +93,14 @@ func fallbackBindToDialer(dialer *net.Dialer, network string, ip net.IP, name st
 }
 
 func fallbackBindToListenConfig(name string) (string, error) {
-	iface, err := net.InterfaceByName(name)
+	iface, err, _ := ifaceSingle.Do(func() (interface{}, error) {
+		return net.InterfaceByName(name)
+	})
 	if err != nil {
 		return "", err
 	}
 
-	addrs, err := iface.Addrs()
+	addrs, err := iface.(*net.Interface).Addrs()
 	if err != nil {
 		return "", err
 	}
diff --git a/component/dialer/bind_darwin.go b/component/dialer/bind_darwin.go
index 469054ca..0ce50541 100644
--- a/component/dialer/bind_darwin.go
+++ b/component/dialer/bind_darwin.go
@@ -29,23 +29,25 @@ func bindControl(ifaceIdx int) controlFn {
 }
 
 func bindIfaceToDialer(dialer *net.Dialer, ifaceName string) error {
-	iface, err := net.InterfaceByName(ifaceName)
+	iface, err, _ := ifaceSingle.Do(func() (interface{}, error) {
+		return net.InterfaceByName(ifaceName)
+	})
 	if err != nil {
 		return err
 	}
 
-	dialer.Control = bindControl(iface.Index)
-
+	dialer.Control = bindControl(iface.(*net.Interface).Index)
 	return nil
 }
 
 func bindIfaceToListenConfig(lc *net.ListenConfig, ifaceName string) error {
-	iface, err := net.InterfaceByName(ifaceName)
+	iface, err, _ := ifaceSingle.Do(func() (interface{}, error) {
+		return net.InterfaceByName(ifaceName)
+	})
 	if err != nil {
 		return err
 	}
 
-	lc.Control = bindControl(iface.Index)
-
+	lc.Control = bindControl(iface.(*net.Interface).Index)
 	return nil
 }