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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(scope='session')
def cmd_dftest(program):
return program('dftest')
@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\noutput: %r" % \
(expected_count, dfp_count, output)
assert dfp_count == expected_count, msg
return checkDFilterCount_real
@fixtures.fixture
def checkDFilterFail(cmd_dftest, base_env):
def checkDFilterFail_real(dfilter, error_message):
"""Run a display filter and expect dftest to fail."""
proc = subprocess.Popen([cmd_dftest, dfilter],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
universal_newlines=True,
env=base_env)
outs, errs = proc.communicate()
assert errs.strip() == 'dftest: %s' % (error_message,), \
'Unexpected dftest stderr:\n%s\nstdout:\n%s' % (errs, outs)
assert proc.returncode == 2, \
'Unexpected dftest exit code: %d. stdout:\n%s\n' % \
(proc.returncode, outs)
return checkDFilterFail_real
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