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# Copyright (c) 2013 by Gilbert Ramirez <gram@alumni.rice.edu>
#
# SPDX-License-Identifier: GPL-2.0-or-later
import os
import tempfile
import unittest
from dftestlib import util
# The binaries to use. We assume we are running
# from the top of the wireshark distro
TSHARK = os.path.join(os.getenv("WS_BIN_PATH", "."), "tshark")
class DFTest(unittest.TestCase):
"""Base class for all tests in this dfilter-test collection."""
# Remove these file when finished (in tearDownClass)
files_to_remove = []
@classmethod
def setUpClass(cls):
"""Create the trace file to be used in the tests."""
assert cls.trace_file
# if the class sets the 'trace_file' field, then it
# names the trace file to use for the tests. It *should*
# reside in dftestfiles
assert not os.path.isabs(cls.trace_file)
cls.trace_file = os.path.join(os.getenv("SOURCE_DIR", "."), "tools",
"dftestfiles", cls.trace_file)
@classmethod
def tearDownClass(cls):
"""Remove the trace file used in the tests."""
for filename in cls.files_to_remove:
if os.path.exists(filename):
try:
os.remove(filename)
except OSError:
pass
def runDFilter(self, dfilter):
# Create the tshark command
cmdv = [TSHARK,
"-n", # No name resolution
"-r", # Next arg is trace file to read
self.trace_file,
"-Y", # packet display filter (used to be -R)
dfilter]
(status, output) = util.exec_cmdv(cmdv)
return status, output
def assertDFilterCount(self, dfilter, expected_count):
"""Run a display filter and expect a certain number of packets."""
(status, output) = self.runDFilter(dfilter)
# tshark must succeed
self.assertEqual(status, util.SUCCESS, output)
# Split the output (one big string) into lines, removing
# empty lines (extra newline at end of output)
lines = [L for L in output.split("\n") if L != ""]
msg = "Expected %d, got: %s" % (expected_count, output)
self.assertEqual(len(lines), expected_count, msg)
def assertDFilterFail(self, dfilter):
"""Run a display filter and expect tshark to fail"""
(status, output) = self.runDFilter(dfilter)
# tshark must succeed
self.assertNotEqual(status, util.SUCCESS, output)
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