Device Emulation(contd.): Specify minimum tshark version that supports the filters we need for verification

test/emultest.py

@@ -12,7 +12,8 @@ import time
 import pytest
 
 from fabric.api import run, env, sudo
-#from harness import Test, TestSuite, TestPreRequisiteError
+
+from utils import get_tshark
 
 sys.path.insert(1, '../binding')
 from core import ost_pb, emul, DroneProxy
@@ -24,8 +25,10 @@ from protocols.vlan_pb2 import vlan
 
 use_defaults = True
 
-tshark = 'tshark'
+tshark = get_tshark(minversion = '1.6')
-# FIXME: ensure minimum tshark version 1.4 => supports ICMPV6 NS/NA filters
+if tshark is None:
+    print 'tshark >= 1.6 not found'
+    sys.exit(1)
 
 # initialize defaults - drone
 host_name = '127.0.0.1'

test/utils.py

@@ -0,0 +1,22 @@
+#! /usr/bin/env python
+import subprocess
+import sys
+
+#from distutils.spawn import find_executable
+from distutils.version import LooseVersion
+
+def get_tshark(minversion = None):
+    tshark = 'tshark'
+    #if sys.platform == 'win32':
+    #    tshark = find_executable(tshark)
+    if tshark and minversion:
+        out = subprocess.check_output([tshark, '-v']).split(None, 2)
+        # we expect output to be of the form 'Tshark <version> ..."
+        ver = out[1]
+        if LooseVersion(ver) < LooseVersion(minversion):
+            tshark = None
+
+    if tshark is not None:
+        print('%s version %s found' % (tshark, ver))
+    return tshark
+