Source code for plaso.parsers.zsh_extended_history

# -*- coding: utf-8 -*-
"""Parser for ZSH extended_history files.

The file format is described here:

import re

import pyparsing

from dfdatetime import posix_time as dfdatetime_posix_time

from plaso.containers import events
from plaso.containers import time_events
from plaso.lib import errors
from plaso.lib import definitions
from plaso.parsers import manager
from plaso.parsers import text_parser

[docs]class ZshHistoryEventData(events.EventData): """ZSH history event data. Attributes: command (str): command that was run. elapsed_seconds (int): number of seconds that the command took to execute. """ DATA_TYPE = 'shell:zsh:history' def __init__(self): """Initializes event data.""" super(ZshHistoryEventData, self).__init__(data_type=self.DATA_TYPE) self.command = None self.elapsed_seconds = None
[docs]class ZshExtendedHistoryParser(text_parser.PyparsingMultiLineTextParser): """Parser for ZSH extended history files""" NAME = 'zsh_extended_history' DATA_FORMAT = 'ZSH extended history file' _ENCODING = 'utf-8' _VERIFICATION_REGEX = re.compile(r'^:\s\d+:\d+;') _PYPARSING_COMPONENTS = { 'timestamp': text_parser.PyparsingConstants.INTEGER.setResultsName( 'timestamp'), 'elapsed_seconds': text_parser.PyparsingConstants.INTEGER.setResultsName( 'elapsed_seconds'), 'command': pyparsing.Regex( r'.+?(?=($|\n:\s\d+:\d+;))', re.DOTALL).setResultsName('command'), } _LINE_GRAMMAR = ( pyparsing.Literal(':') + _PYPARSING_COMPONENTS['timestamp'] + pyparsing.Literal(':') + _PYPARSING_COMPONENTS['elapsed_seconds'] + pyparsing.Literal(';') + _PYPARSING_COMPONENTS['command'] + pyparsing.LineEnd()) LINE_STRUCTURES = [('command', _LINE_GRAMMAR)]
[docs] def ParseRecord(self, parser_mediator, key, structure): """Parses a record and produces a ZSH history event. 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): structure parsed from the log file. Raises: ParseError: when the structure type is unknown. """ if key != 'command': raise errors.ParseError( 'Unable to parse record, unknown structure: {0:s}'.format(key)) event_data = ZshHistoryEventData() event_data.command = self._GetValueFromStructure(structure, 'command') event_data.elapsed_seconds = self._GetValueFromStructure( structure, 'elapsed_seconds') timestamp = self._GetValueFromStructure(structure, 'timestamp') date_time = dfdatetime_posix_time.PosixTime(timestamp=timestamp) event = time_events.DateTimeValuesEvent( date_time, definitions.TIME_DESCRIPTION_MODIFICATION) parser_mediator.ProduceEventWithEventData(event, event_data)
[docs] def VerifyStructure(self, parser_mediator, lines): """Verifies whether content corresponds to a ZSH extended_history file. Args: parser_mediator (ParserMediator): mediates interactions between parsers and other components, such as storage and dfvfs. lines (str): one or more lines from the text file. Returns: bool: True if the line was successfully parsed. """ if self._VERIFICATION_REGEX.match(lines): return True return False