对外访服务器的代码段进行了规范

app/src/main/java/com/pkusz/min_vpn_client/services/MINVpnService.java

@@ -161,7 +161,13 @@ public class MINVpnService extends VpnService implements Handler.Callback{
                     proxyHost, proxyPort, allow, packages, GlobalSetting.isSM4);
             // 对vpn connection进行各种监听设置，并启动执行其run函数
             startConnection(minVpnConnection);
-        }else if(MINVpnSettingAPI.INSTANCE.getProxyMode()==1){
+        }else if((MINVpnSettingAPI.INSTANCE.getProxyMode()==1)
+                &&(GlobalSetting.openFirewall)){
+            // 先判断是否有翻墙服务器的信息
+            if(MINVpnSettingAPI.INSTANCE.getOneExtranetVpnServerInfo()==null){
+                System.out.println("error: 未获取到翻墙服务器的信息!!!");
+                return;
+            }
             // 通过与内网服务器握手，获取tun网卡的IP地址
             MINVpnInnerConnection innerConnection = new MINVpnInnerConnection(
                     this, mNextConnectionId.getAndIncrement(), server, port, secret,