From 8ce535e672efb48e82a559bac0f5be7136c82344 Mon Sep 17 00:00:00 2001
From: Will Szumski <will@cowboycoders.org>
Date: Tue, 22 Nov 2016 18:22:28 +0000
Subject: check for valid nameserver

---
 src/main/java/org/xapek/andiodine/IodineVpnService.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/main/java/org/xapek/andiodine/IodineVpnService.java b/src/main/java/org/xapek/andiodine/IodineVpnService.java
index 80df946..02544b5 100644
--- a/src/main/java/org/xapek/andiodine/IodineVpnService.java
+++ b/src/main/java/org/xapek/andiodine/IodineVpnService.java
@@ -210,6 +210,11 @@ public class IodineVpnService extends VpnService implements Runnable {
             setStatus(ACTION_STATUS_CONNECT, mConfiguration.getId(), null);
 
             String tunnelNamesver = IodineClient.getPropertyNetDns1();
+            if (tunnelNamesver == "") {
+                Log.e(TAG, "No valid IPv4 name servers detected. Aborting...");
+                return;
+            }
+            Log.d(TAG, "using name server: " + tunnelNamesver);
             if (!"".equals(mConfiguration.getTunnelNameserver())) {
                 tunnelNamesver = mConfiguration.getTunnelNameserver();
             }
-- 
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