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Filename : mac_parser.py
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# Copyright 2020 Red Hat, Inc. Jake Hunsaker <jhunsake@redhat.com>

# This file is part of the sos project: https://github.com/sosreport/sos
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# version 2 of the GNU General Public License.
#
# See the LICENSE file in the source distribution for further information.

from sos.cleaner.parsers import SoSCleanerParser
from sos.cleaner.mappings.mac_map import SoSMacMap

import re

# aa:bb:cc:fe:ff:dd:ee:ff
IPV6_REG_8HEX = (
    r'((?<!([0-9a-fA-F\'\"]:)|::)([^:|-])?([0-9a-fA-F]{2}(:|-)){7}'
    r'[0-9a-fA-F]{2}(\'|\")?(\s|$))'
)
# aabb:ccee:ddee:ffaa
IPV6_REG_4HEX = (
    r'((?<!([0-9a-fA-F\'\"]:)|::)(([^:\-]?[0-9a-fA-F]{4}(:|-)){3}'
    r'[0-9a-fA-F]{4}(\'|\")?(\s|$)))'
)
# aa:bb:cc:dd:ee:ff avoiding ipv6 substring matches
IPV4_REG = (
    r'((?<!([0-9a-fA-F\'\"]:)|::)(([^:\-])?([0-9a-fA-F]{2}([:-])){5}'
    r'([0-9a-fA-F]){2}(\'|\")?(\s|$)))'
)


class SoSMacParser(SoSCleanerParser):
    """Handles parsing for MAC addresses"""

    name = 'MAC Parser'
    regex_patterns = [
        IPV6_REG_8HEX,
        IPV6_REG_4HEX,
        IPV4_REG
    ]
    obfuscated_patterns = (
        '53:4f:53',
        '534f:53'
    )
    skip_files = [
        'sos_commands/kernel/modinfo.*'
    ]
    map_file_key = 'mac_map'
    compile_regexes = False

    def __init__(self, config):
        self.mapping = SoSMacMap()
        super(SoSMacParser, self).__init__(config)

    def reduce_mac_match(self, match):
        """Strips away leading and trailing non-alphanum characters from any
        matched string to leave us with just the bare MAC addr
        """
        while not (match[0].isdigit() or match[0].isalpha()):
            match = match[1:]
        while not (match[-1].isdigit() or match[-1].isalpha()):
            match = match[0:-1]
        # just to be safe, call strip() to remove any padding
        return match.strip()

    def _parse_line(self, line):
        count = 0
        for pattern in self.regex_patterns:
            matches = [m[0] for m in re.findall(pattern, line, re.I)]
            if matches:
                count += len(matches)
                for match in matches:
                    stripped_match = self.reduce_mac_match(match)
                    if stripped_match.startswith(self.obfuscated_patterns):
                        # avoid double scrubbing
                        continue
                    new_match = self.mapping.get(stripped_match)
                    line = line.replace(stripped_match, new_match)
        return line, count