From eeb647b99f928a220ce99c08dcdcc67bce92616b Mon Sep 17 00:00:00 2001
From: Babak Farrokhi <babak@farrokhi.net>
Date: Wed, 15 Jun 2016 16:26:58 +0430
Subject: [PATCH] Fix bug in dealing with root servers

---
 dnseval.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/dnseval.py b/dnseval.py
index 8847b20..e061126 100755
--- a/dnseval.py
+++ b/dnseval.py
@@ -133,7 +133,7 @@ def dnsping(host, server, dnsrecord, timeout, count, use_tcp=False):
             break
         try:
             stime = time.time()
-            answers = resolver.query(host, dnsrecord, tcp=use_tcp)  # todo: response validation in future
+            answers = resolver.query(host, dnsrecord, tcp=use_tcp, raise_on_no_answer=False)  # todo: response validation in future
             etime = time.time()
         except (dns.resolver.NoNameservers, dns.resolver.NoAnswer):
             break
@@ -161,7 +161,7 @@ def dnsping(host, server, dnsrecord, timeout, count, use_tcp=False):
         r_avg = 0
         r_stddev = 0
 
-    if answers:
+    if answers is not None:
         flags = answers.response.flags
 
     return server, r_avg, r_min, r_max, r_stddev, r_lost_percent, flags