def setup_sniff_tcpdump_parser(parser_sniff):
    # arguments which will be passed to tcpdump
    parser_sniff_tcpdump = parser_sniff.add_argument_group('tcpdump arguments')
    # TODO: tcpdump_parser.add_argument('-c', '--count', re)
    parser_sniff_tcpdump.add_argument('-a', '--ip-address=', help='IP address of the device to sniff', dest='device_ip')
    parser_sniff_tcpdump.add_argument('-i', '--interface=', help='Interface of the capture device.', dest='capture_interface',default='')
    parser_sniff_tcpdump.add_argument('-I', '--monitor-mode', help='Put interface into monitor mode',
                                      action='store_true')
    parser_sniff_tcpdump.add_argument('-n', help='Deactivate name resolution. Option is set by default.',
                                      action='store_true')
    parser_sniff_tcpdump.add_argument('-#', '--number',
                                      help='Print packet number at beginning of line. Set by default.',
                                      action='store_true')
    parser_sniff_tcpdump.add_argument('-e', help='Print link layer headers. Option is set by default.',
                                      action='store_true')
    parser_sniff_tcpdump.add_argument('-t', action='count', default=0,
                                      help='Please see tcpdump manual for details. Unused by default.')


def setup_sniff_parser(subparsers):
    # create parser for 'sniff' command
    parser_sniff = subparsers.add_parser('sniff', help='Start tcpdump capture.')
    setup_sniff_tcpdump_parser(parser_sniff)
    setup_pcap_filter_parser(parser_sniff)
    cap_size_group = parser_sniff.add_mutually_exclusive_group(required=True)
    cap_size_group.add_argument('-c', '--count', type=int, help='Number of packets to capture.', default=0)
    cap_size_group.add_argument('--mins', type=int, help='Time in minutes to capture.', default=60)


def setup_pcap_filter_parser(parser_sniff):
    parser_pcap_filter = parser_sniff.add_argument_parser('pcap-filter expression')
    pass