From 58f720b41f28d0ea61f34889a921cdcfb561384f Mon Sep 17 00:00:00 2001
From: snltty <1069410172@qq.com>
Date: Sun, 4 Aug 2024 21:42:53 +0800
Subject: [PATCH] =?UTF-8?q?=E7=BD=91=E5=8D=A1=E8=87=AA=E5=8A=A8=E5=90=AF?=
 =?UTF-8?q?=E5=8A=A8?=
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---
 linker.tun/LinkerLinuxTunDevice.cs | 4 ++++
 linker.tun/LinkerWinTunDevice.cs   | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/linker.tun/LinkerLinuxTunDevice.cs b/linker.tun/LinkerLinuxTunDevice.cs
index 671d8086..a3e63a44 100644
--- a/linker.tun/LinkerLinuxTunDevice.cs
+++ b/linker.tun/LinkerLinuxTunDevice.cs
@@ -127,6 +127,8 @@ namespace linker.tun
         }
         public void SetNat()
         {
+            if (address == null) return;
+
             IPAddress network = NetworkHelper.ToNetworkIp(address, NetworkHelper.MaskValue(prefixLength));
             CommandHelper.Linux(string.Empty, new string[] {
                 $"sysctl -w net.ipv4.ip_forward=1",
@@ -135,6 +137,8 @@ namespace linker.tun
         }
         public void RemoveNat()
         {
+            if (address == null) return;
+
             IPAddress network = NetworkHelper.ToNetworkIp(address, NetworkHelper.MaskValue(prefixLength));
             string iptableLineNumbers = CommandHelper.Linux(string.Empty, new string[] { $"iptables -t nat -L --line-numbers | grep {network}/{prefixLength} | cut -d' ' -f1" });
             if (string.IsNullOrWhiteSpace(iptableLineNumbers) == false)
diff --git a/linker.tun/LinkerWinTunDevice.cs b/linker.tun/LinkerWinTunDevice.cs
index 5ac0b664..b7abf2c8 100644
--- a/linker.tun/LinkerWinTunDevice.cs
+++ b/linker.tun/LinkerWinTunDevice.cs
@@ -108,10 +108,12 @@ namespace linker.tun
 
         public void SetMtu(int value)
         {
+            if (address == null) return;
             CommandHelper.Windows(string.Empty, new string[] { $"netsh interface ipv4 set subinterface {interfaceNumber}  mtu={value} store=persistent" });
         }
         public void SetNat()
         {
+            if (address == null) return;
             IPAddress network = NetworkHelper.ToNetworkIp(this.address, NetworkHelper.MaskValue(prefixLength));
             CommandHelper.PowerShell(string.Empty, new string[] { $"New-NetNat -Name {Name} -InternalIPInterfaceAddressPrefix {network}/{prefixLength}" });
         }