mirror of
https://github.com/volatilityfoundation/volatility
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iMHLv2
126 lines
4.4 KiB
Python
126 lines
4.4 KiB
Python
# Volatility
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#
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# Authors:
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# Mike Auty <mike.auty@gmail.com>
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#
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# This file is part of Volatility.
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#
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# Volatility is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# Volatility is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Volatility. If not, see <http://www.gnu.org/licenses/>.
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#
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import os, time, calendar
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import datetime
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import volatility.conf as conf
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import volatility.debug as debug
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try:
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import pytz
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tz_pytz = True
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except ImportError:
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tz_pytz = False
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config = conf.ConfObject()
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class OffsetTzInfo(datetime.tzinfo):
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"""Timezone implementation that allows offsets specified in seconds"""
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def __init__(self, offset = None, *args, **kwargs):
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"""Accepts offset in seconds"""
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self.offset = offset
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datetime.tzinfo.__init__(self, *args, **kwargs)
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def set_offset(self, offset):
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"""Simple setter for offset"""
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self.offset = offset
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def utcoffset(self, dt):
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"""Returns the offset from UTC"""
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if self.offset is None:
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return None
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return datetime.timedelta(seconds = self.offset) + self.dst(dt)
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def dst(self, _dt):
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"""We almost certainly can't know about DST, so we say it's always off"""
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# FIXME: Maybe we can know or make guesses about DST?
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return datetime.timedelta(0)
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def tzname(self, _dt):
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"""Return a useful timezone name"""
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if self.offset is None:
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return "UNKNOWN"
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return ""
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class UTC(datetime.tzinfo):
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"""Concrete instance of the UTC timezone"""
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def utcoffset(self, _dt):
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"""Returns an offset from UTC of 0"""
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return datetime.timedelta(0)
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def dst(self, _dt):
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"""Returns no daylight savings offset"""
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return datetime.timedelta(0)
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def tzname(self, _dt):
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"""Returns the timezone name"""
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return "UTC"
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def display_datetime(dt, custom_tz = None):
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"""Returns a string from a datetime according to the display TZ (or a custom one"""
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timeformat = "%Y-%m-%d %H:%M:%S %Z%z"
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if dt.tzinfo is not None and dt.tzinfo.utcoffset(dt) is not None:
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if custom_tz is not None:
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dt = dt.astimezone(custom_tz)
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elif config.TZ is not None:
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if isinstance(config.TZ, str):
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secs = calendar.timegm(dt.timetuple())
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os.environ['TZ'] = config.TZ
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time.tzset()
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# Remove the %z which appears not to work
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timeformat = timeformat[:-2]
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return time.strftime(timeformat, time.localtime(secs))
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else:
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dt = dt.astimezone(config.tz)
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return ("{0:" + timeformat + "}").format(dt)
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def tz_from_string(_option, _opt_str, value, parser):
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"""Stores a tzinfo object from a string"""
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if value is not None:
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if value[0] in ['+', '-']:
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# Handed a numeric offset, create an OffsetTzInfo
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valarray = [value[i:i + 2] for i in range(1, len(value), 2)]
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multipliers = [3600, 60]
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offset = 0
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for i in range(min(len(valarray), len(multipliers))):
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offset += int(valarray[i]) * multipliers[i]
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if value[0] == '-':
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offset = -offset
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timezone = OffsetTzInfo(offset = offset)
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else:
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# Value is a lookup, choose pytz over time.tzset
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if tz_pytz:
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try:
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timezone = pytz.timezone(value)
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except pytz.UnknownTimeZoneError:
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debug.error("Unknown display timezone specified")
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else:
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if not hasattr(time, 'tzset'):
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debug.error("This operating system doesn't support tzset, please either specify an offset (eg. +1000) or install pytz")
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timezone = value
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parser.values.tz = timezone
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config.add_option("TZ", action = "callback", callback = tz_from_string,
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cache_invalidator = False,
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help = "Sets the timezone for displaying timestamps",
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default = None, nargs = 1, type = str)
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