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#
# Wireshark tests
# By Gerald Combs <gerald@wireshark.org>
#
# Ported from a set of Bash scripts which were copyright 2005 Ulf Lamping
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
'''Subprocess test case superclass'''
import os
import os.path
import re
import subprocess
import sys
import enum
# To do:
# - Add a subprocesstest.SkipUnlessCapture decorator?
# - Try to catch crashes? See the comments below in waitProcess.
process_timeout = 300 # Seconds
class ExitCodes(enum.IntEnum):
OK = 0
COMMAND_LINE = 1
INVALID_INTERFACE = 2
INVALID_FILE_ERROR = 3
INVALID_FILTER_ERROR = 4
INVALID_CAPABILITY = 5
IFACE_NO_LINK_TYPES = 6
IFACE_HAS_NO_TIMESTAMP_TYPES = 7
INIT_FAILED = 8
OPEN_ERROR = 9
PCAP_NOT_SUPPORTED = 10
DUMPCAP_NOT_SUPPORTED = 11
NO_INTERFACES = 12
PCAP_ERROR = 13
def run(*args, capture_output=False, stdout=None, stderr=None, encoding='utf-8', **kwargs):
''' Wrapper for subprocess.run() that captures and decodes output.'''
# If the user told us what to do with standard streams use that.
if capture_output or stdout or stderr:
return subprocess.run(*args, capture_output=capture_output, stdout=stdout, stderr=stderr, encoding=encoding, **kwargs)
# If the user doesn't want to capture output try to ensure the child inherits the parents stdout and stderr on
# all platforms, so pytest can reliably capture it and do the right thing. Otherwise the child output may be interleaved
# on the console with the parent and mangle pytest's status output.
#
# Make the child inherit only the parents stdout and stderr.
return subprocess.run(*args, close_fds=True, stdout=sys.stdout, stderr=sys.stderr, encoding=encoding, **kwargs)
def check_run(*args, **kwargs):
''' Same as run(), also check child process returns 0 (success)'''
proc = run(*args, check=True, **kwargs)
return proc
def cat_dhcp_command(mode):
'''Create a command string for dumping dhcp.pcap to stdout'''
# XXX Do this in Python in a thread?
sd_cmd = ''
if sys.executable:
sd_cmd = '"{}" '.format(sys.executable)
this_dir = os.path.dirname(__file__)
sd_cmd += os.path.join(this_dir, 'util_dump_dhcp_pcap.py ' + mode)
return sd_cmd
def cat_cap_file_command(cap_files):
'''Create a command string for dumping one or more capture files to stdout'''
# XXX Do this in Python in a thread?
if isinstance(cap_files, str):
cap_files = [ cap_files ]
quoted_paths = ' '.join('"{}"'.format(cap_file) for cap_file in cap_files)
if sys.platform.startswith('win32'):
# https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-xp/bb491026(v=technet.10)
# says that the `type` command "displays the contents of a text
# file." Copy to the console instead.
return 'copy {} CON'.format(quoted_paths)
return 'cat {}'.format(quoted_paths)
def count_output(text, search_pat=None):
'''Returns the number of output lines (search_pat=None), otherwise returns a match count.'''
if not text:
return 0
if not search_pat:
return len(text.splitlines())
match_count = 0
search_re = re.compile(search_pat)
for line in text.splitlines():
if search_re.search(line):
match_count += 1
return match_count
def grep_output(text, search_pat):
return count_output(text, search_pat) > 0
def check_packet_count(cmd_capinfos, num_packets, cap_file):
'''Make sure a capture file contains a specific number of packets.'''
got_num_packets = False
capinfos_testout = subprocess.run([cmd_capinfos, cap_file], capture_output=True, check=True, encoding='utf-8')
assert capinfos_testout.returncode == 0
assert capinfos_testout.stdout
count_pat = r'Number of packets:\s+{}'.format(num_packets)
if re.search(count_pat, capinfos_testout.stdout):
got_num_packets = True
assert got_num_packets, 'Failed to capture exactly {} packets'.format(num_packets)
def get_capture_info(cmd_capinfos, capinfos_args, cap_file):
'''Run capinfos on a capture file and log its output.
capinfos_args must be a sequence.'''
capinfos_cmd = [cmd_capinfos]
if capinfos_args:
capinfos_cmd += capinfos_args
capinfos_cmd.append(cap_file)
capinfos_data = subprocess.check_output(capinfos_cmd)
capinfos_stdout = capinfos_data.decode('UTF-8', 'replace')
return capinfos_stdout
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