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# Copyright (c) 2013 by Gilbert Ramirez <gram@alumni.rice.edu>
#
# SPDX-License-Identifier: GPL-2.0-or-later
import subprocess
import fixtures
@fixtures.fixture
def dfilter_cmd(cmd_tshark, capture_file, request):
def wrapped(dfilter):
return (
cmd_tshark,
"-n", # No name resolution
"-r", # Next arg is trace file to read
capture_file(request.instance.trace_file),
"-Y", # packet display filter (used to be -R)
dfilter
)
return wrapped
@fixtures.fixture
def checkDFilterCount(dfilter_cmd, base_env):
def checkDFilterCount_real(dfilter, expected_count):
"""Run a display filter and expect a certain number of packets."""
output = subprocess.check_output(dfilter_cmd(dfilter),
universal_newlines=True,
stderr=subprocess.STDOUT,
env=base_env)
dfp_count = output.count("\n")
msg = "Expected %d, got: %s" % (expected_count, dfp_count)
assert dfp_count == expected_count, msg
return checkDFilterCount_real
@fixtures.fixture
def checkDFilterFail(dfilter_cmd, base_env):
def checkDFilterFail_real(dfilter):
"""Run a display filter and expect tshark to fail."""
exitcode = subprocess.call(dfilter_cmd(dfilter),
stdout=subprocess.DEVNULL,
stderr=subprocess.STDOUT,
env=base_env)
assert exitcode == 2, 'Expected process to fail, got %d' % (exitcode,)
return checkDFilterFail_real
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