# -*- coding: utf-8 -*-
"""Text parser plugin for Mac OS launchd log files."""
import pyparsing
from dfdatetime import time_elements as dfdatetime_time_elements
from plaso.containers import events
from plaso.lib import errors
from plaso.parsers import text_parser
from plaso.parsers.text_plugins import interface
[docs]
class MacOSLaunchdEventData(events.EventData):
"""Mac OS launchd log event data.
Attributes:
body (str): content of the log event.
process_name (str): name of the process that created the record.
severity (str): severity of the message.
written_time (dfdatetime.DateTimeValues): date and time the log entry was
written.
"""
DATA_TYPE = 'macos:launchd_log:entry'
[docs]
def __init__(self):
"""Initializes event data."""
super(MacOSLaunchdEventData, self).__init__(data_type=self.DATA_TYPE)
self.body = None
self.process_name = None
self.severity = None
self.written_time = None
[docs]
class MacOSLaunchdLogTextPlugin(interface.TextPlugin):
"""Text parser plugin for Mac OS launchd log files."""
NAME = 'macos_launchd_log'
DATA_FORMAT = 'Mac OS launchd log file'
# Date and time values are formatted as:
# 2023-06-08 14:51:38.987368
_DATE_TIME = pyparsing.Regex(
r'(?P<date_time>[0-9]{4}-[0-9]{2}-[0-9]{2} '
r'[0-9]{2}:[0-9]{2}:[0-9]{2}.[0-9]{6}) ')
_PROCESS_NAME = pyparsing.Regex(r'[(](?P<process_name>[^)]+)[)] ')
_SEVERITY = pyparsing.Regex(r'[<](?P<severity>[^>]+)[>]: ')
_END_OF_LINE = pyparsing.Suppress(pyparsing.LineEnd())
_LOG_LINE = (
_DATE_TIME + pyparsing.Optional(_PROCESS_NAME) + _SEVERITY +
pyparsing.restOfLine().set_results_name('body') + _END_OF_LINE)
_LINE_STRUCTURES = [('log_line', _LOG_LINE)]
VERIFICATION_GRAMMAR = _LOG_LINE
def _ParseRecord(self, parser_mediator, key, structure):
"""Parses a pyparsing structure.
Args:
parser_mediator (ParserMediator): mediates interactions between parsers
and other components, such as storage and dfVFS.
key (str): name of the parsed structure.
structure (pyparsing.ParseResults): tokens from a parsed log line.
Raises:
ParseError: if the structure cannot be parsed.
"""
if key == 'log_line':
time_elements_structure = self._GetValueFromStructure(
structure, 'date_time')
event_data = MacOSLaunchdEventData()
event_data.body = self._GetValueFromStructure(structure, 'body')
event_data.process_name = self._GetValueFromStructure(
structure, 'process_name')
event_data.severity = self._GetValueFromStructure(structure, 'severity')
event_data.written_time = self._ParseTimeElements(time_elements_structure)
parser_mediator.ProduceEventData(event_data)
def _ParseTimeElements(self, time_elements_structure):
"""Parses date and time elements.
Args:
time_elements_structure (pyparsing.ParseResults): date and time elements
of a log line.
Returns:
dfdatetime.TimeElements: date and time value.
Raises:
ParseError: if a valid date and time value cannot be derived from
the time elements.
"""
try:
date_time = dfdatetime_time_elements.TimeElementsInMicroseconds()
date_time.CopyFromDateTimeString(time_elements_structure)
return date_time
except (TypeError, ValueError) as exception:
raise errors.ParseError(
f'Unable to parse time elements with error: {exception!s}')
[docs]
def CheckRequiredFormat(self, parser_mediator, text_reader):
"""Check if the log record has the minimal structure required by the parser.
Args:
parser_mediator (ParserMediator): mediates interactions between parsers
and other components, such as storage and dfVFS.
text_reader (EncodedTextReader): text reader.
Returns:
bool: True if this is the correct plugin, False otherwise.
"""
try:
structure = self._VerifyString(text_reader.lines)
except errors.ParseError:
return False
time_elements_structure = self._GetValueFromStructure(
structure, 'date_time')
try:
self._ParseTimeElements(time_elements_structure)
except errors.ParseError:
return False
return True
text_parser.TextLogParser.RegisterPlugin(MacOSLaunchdLogTextPlugin)