functest utils - get_resolvconf_ns() Ensure that dns works with dns name resolution

JIRA: FUNCTEST-402

Change-Id: I5fa9204aafb13330eb810950aa7bc728f1a69162
Signed-off-by: boucherv <valentin.boucher@orange.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/utils/functest_utils.py b/utils/functest_utils.py
index b0014308e..5f790a015 100644
--- a/utils/functest_utils.py
+++ b/utils/functest_utils.py
@@ -16,10 +16,10 @@ import os
 import os.path
 import re
 import shutil
-import socket
 import subprocess
 import sys
 import urllib2
+import dns.resolver
 
 import functest.ci.tier_builder as tb
 from git import Repo
@@ -226,13 +226,17 @@ def get_resolvconf_ns():
     nameservers = []
     rconf = open("/etc/resolv.conf", "r")
     line = rconf.readline()
+    resolver = dns.resolver.Resolver()
     while line:
         ip = re.search(r"\b(?:[0-9]{1,3}\.){3}[0-9]{1,3}\b", line)
-        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
         if ip:
-            result = sock.connect_ex((ip.group(), 53))
-            if result == 0:
-                nameservers.append(ip.group())
+            resolver.nameservers = [str(ip)]
+            try:
+                result = resolver.query('opnfv.org')[0]
+                if result != "":
+                    nameservers.append(ip.group())
+            except dns.exception.Timeout:
+                pass
         line = rconf.readline()
     return nameservers