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bazarr/libs/rarfile.py

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# rarfile.py
#
# Copyright (c) 2005-2020 Marko Kreen <markokr@gmail.com>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
"""RAR archive reader.
This is Python module for Rar archive reading. The interface
is made as :mod:`zipfile`-like as possible.
Basic logic:
- Parse archive structure with Python.
- Extract non-compressed files with Python
- Extract compressed files with unrar.
- Optionally write compressed data to temp file to speed up unrar,
otherwise it needs to scan whole archive on each execution.
Example::
import rarfile
rf = rarfile.RarFile("myarchive.rar")
for f in rf.infolist():
print(f.filename, f.file_size)
if f.filename == "README":
print(rf.read(f))
Archive files can also be accessed via file-like object returned
by :meth:`RarFile.open`::
import rarfile
with rarfile.RarFile("archive.rar") as rf:
with rf.open("README") as f:
for ln in f:
print(ln.strip())
For decompression to work, either ``unrar`` or ``unar`` tool must be in PATH.
"""
import errno
import io
import os
import re
import shutil
import struct
import sys
import warnings
from binascii import crc32, hexlify
from datetime import datetime, timezone
from hashlib import blake2s, pbkdf2_hmac, sha1, sha256
from pathlib import Path
from struct import Struct, pack, unpack
from subprocess import DEVNULL, PIPE, STDOUT, Popen
from tempfile import mkstemp
AES = None
# only needed for encrypted headers
try:
try:
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.ciphers import (
Cipher, algorithms, modes,
)
_have_crypto = 1
except ImportError:
from Crypto.Cipher import AES
_have_crypto = 2
except ImportError:
_have_crypto = 0
class AES_CBC_Decrypt:
"""Decrypt API"""
def __init__(self, key, iv):
if _have_crypto == 2:
self.decrypt = AES.new(key, AES.MODE_CBC, iv).decrypt
else:
ciph = Cipher(algorithms.AES(key), modes.CBC(iv), default_backend())
self.decrypt = ciph.decryptor().update
__version__ = "4.1"
# export only interesting items
__all__ = ["get_rar_version", "is_rarfile", "is_rarfile_sfx", "RarInfo", "RarFile", "RarExtFile"]
##
## Module configuration. Can be tuned after importing.
##
#: executable for unrar tool
UNRAR_TOOL = "unrar"
#: executable for unar tool
UNAR_TOOL = "unar"
#: executable for bsdtar tool
BSDTAR_TOOL = "bsdtar"
#: executable for p7zip/7z tool
SEVENZIP_TOOL = "7z"
#: executable for alternative 7z tool
SEVENZIP2_TOOL = "7zz"
#: default fallback charset
DEFAULT_CHARSET = "windows-1252"
#: list of encodings to try, with fallback to DEFAULT_CHARSET if none succeed
TRY_ENCODINGS = ("utf8", "utf-16le")
#: whether to speed up decompression by using tmp archive
USE_EXTRACT_HACK = 1
#: limit the filesize for tmp archive usage
HACK_SIZE_LIMIT = 20 * 1024 * 1024
#: set specific directory for mkstemp() used by hack dir usage
HACK_TMP_DIR = None
#: Separator for path name components. Always "/".
PATH_SEP = "/"
##
## rar constants
##
# block types
RAR_BLOCK_MARK = 0x72 # r
RAR_BLOCK_MAIN = 0x73 # s
RAR_BLOCK_FILE = 0x74 # t
RAR_BLOCK_OLD_COMMENT = 0x75 # u
RAR_BLOCK_OLD_EXTRA = 0x76 # v
RAR_BLOCK_OLD_SUB = 0x77 # w
RAR_BLOCK_OLD_RECOVERY = 0x78 # x
RAR_BLOCK_OLD_AUTH = 0x79 # y
RAR_BLOCK_SUB = 0x7a # z
RAR_BLOCK_ENDARC = 0x7b # {
# flags for RAR_BLOCK_MAIN
RAR_MAIN_VOLUME = 0x0001
RAR_MAIN_COMMENT = 0x0002
RAR_MAIN_LOCK = 0x0004
RAR_MAIN_SOLID = 0x0008
RAR_MAIN_NEWNUMBERING = 0x0010
RAR_MAIN_AUTH = 0x0020
RAR_MAIN_RECOVERY = 0x0040
RAR_MAIN_PASSWORD = 0x0080
RAR_MAIN_FIRSTVOLUME = 0x0100
RAR_MAIN_ENCRYPTVER = 0x0200
# flags for RAR_BLOCK_FILE
RAR_FILE_SPLIT_BEFORE = 0x0001
RAR_FILE_SPLIT_AFTER = 0x0002
RAR_FILE_PASSWORD = 0x0004
RAR_FILE_COMMENT = 0x0008
RAR_FILE_SOLID = 0x0010
RAR_FILE_DICTMASK = 0x00e0
RAR_FILE_DICT64 = 0x0000
RAR_FILE_DICT128 = 0x0020
RAR_FILE_DICT256 = 0x0040
RAR_FILE_DICT512 = 0x0060
RAR_FILE_DICT1024 = 0x0080
RAR_FILE_DICT2048 = 0x00a0
RAR_FILE_DICT4096 = 0x00c0
RAR_FILE_DIRECTORY = 0x00e0
RAR_FILE_LARGE = 0x0100
RAR_FILE_UNICODE = 0x0200
RAR_FILE_SALT = 0x0400
RAR_FILE_VERSION = 0x0800
RAR_FILE_EXTTIME = 0x1000
RAR_FILE_EXTFLAGS = 0x2000
# flags for RAR_BLOCK_ENDARC
RAR_ENDARC_NEXT_VOLUME = 0x0001
RAR_ENDARC_DATACRC = 0x0002
RAR_ENDARC_REVSPACE = 0x0004
RAR_ENDARC_VOLNR = 0x0008
# flags common to all blocks
RAR_SKIP_IF_UNKNOWN = 0x4000
RAR_LONG_BLOCK = 0x8000
# Host OS types
RAR_OS_MSDOS = 0 #: MSDOS (only in RAR3)
RAR_OS_OS2 = 1 #: OS2 (only in RAR3)
RAR_OS_WIN32 = 2 #: Windows
RAR_OS_UNIX = 3 #: UNIX
RAR_OS_MACOS = 4 #: MacOS (only in RAR3)
RAR_OS_BEOS = 5 #: BeOS (only in RAR3)
# Compression methods - "0".."5"
RAR_M0 = 0x30 #: No compression.
RAR_M1 = 0x31 #: Compression level `-m1` - Fastest compression.
RAR_M2 = 0x32 #: Compression level `-m2`.
RAR_M3 = 0x33 #: Compression level `-m3`.
RAR_M4 = 0x34 #: Compression level `-m4`.
RAR_M5 = 0x35 #: Compression level `-m5` - Maximum compression.
#
# RAR5 constants
#
RAR5_BLOCK_MAIN = 1
RAR5_BLOCK_FILE = 2
RAR5_BLOCK_SERVICE = 3
RAR5_BLOCK_ENCRYPTION = 4
RAR5_BLOCK_ENDARC = 5
RAR5_BLOCK_FLAG_EXTRA_DATA = 0x01
RAR5_BLOCK_FLAG_DATA_AREA = 0x02
RAR5_BLOCK_FLAG_SKIP_IF_UNKNOWN = 0x04
RAR5_BLOCK_FLAG_SPLIT_BEFORE = 0x08
RAR5_BLOCK_FLAG_SPLIT_AFTER = 0x10
RAR5_BLOCK_FLAG_DEPENDS_PREV = 0x20
RAR5_BLOCK_FLAG_KEEP_WITH_PARENT = 0x40
RAR5_MAIN_FLAG_ISVOL = 0x01
RAR5_MAIN_FLAG_HAS_VOLNR = 0x02
RAR5_MAIN_FLAG_SOLID = 0x04
RAR5_MAIN_FLAG_RECOVERY = 0x08
RAR5_MAIN_FLAG_LOCKED = 0x10
RAR5_FILE_FLAG_ISDIR = 0x01
RAR5_FILE_FLAG_HAS_MTIME = 0x02
RAR5_FILE_FLAG_HAS_CRC32 = 0x04
RAR5_FILE_FLAG_UNKNOWN_SIZE = 0x08
RAR5_COMPR_SOLID = 0x40
RAR5_ENC_FLAG_HAS_CHECKVAL = 0x01
RAR5_ENDARC_FLAG_NEXT_VOL = 0x01
RAR5_XFILE_ENCRYPTION = 1
RAR5_XFILE_HASH = 2
RAR5_XFILE_TIME = 3
RAR5_XFILE_VERSION = 4
RAR5_XFILE_REDIR = 5
RAR5_XFILE_OWNER = 6
RAR5_XFILE_SERVICE = 7
RAR5_XTIME_UNIXTIME = 0x01
RAR5_XTIME_HAS_MTIME = 0x02
RAR5_XTIME_HAS_CTIME = 0x04
RAR5_XTIME_HAS_ATIME = 0x08
RAR5_XTIME_UNIXTIME_NS = 0x10
RAR5_XENC_CIPHER_AES256 = 0
RAR5_XENC_CHECKVAL = 0x01
RAR5_XENC_TWEAKED = 0x02
RAR5_XHASH_BLAKE2SP = 0
RAR5_XREDIR_UNIX_SYMLINK = 1
RAR5_XREDIR_WINDOWS_SYMLINK = 2
RAR5_XREDIR_WINDOWS_JUNCTION = 3
RAR5_XREDIR_HARD_LINK = 4
RAR5_XREDIR_FILE_COPY = 5
RAR5_XREDIR_ISDIR = 0x01
RAR5_XOWNER_UNAME = 0x01
RAR5_XOWNER_GNAME = 0x02
RAR5_XOWNER_UID = 0x04
RAR5_XOWNER_GID = 0x08
RAR5_OS_WINDOWS = 0
RAR5_OS_UNIX = 1
DOS_MODE_ARCHIVE = 0x20
DOS_MODE_DIR = 0x10
DOS_MODE_SYSTEM = 0x04
DOS_MODE_HIDDEN = 0x02
DOS_MODE_READONLY = 0x01
RAR5_PW_CHECK_SIZE = 8
RAR5_PW_SUM_SIZE = 4
##
## internal constants
##
RAR_ID = b"Rar!\x1a\x07\x00"
RAR5_ID = b"Rar!\x1a\x07\x01\x00"
WIN32 = sys.platform == "win32"
BSIZE = 512 * 1024 if WIN32 else 64 * 1024
SFX_MAX_SIZE = 2 * 1024 * 1024
RAR_V3 = 3
RAR_V5 = 5
_BAD_CHARS = r"""\x00-\x1F<>|"?*"""
RC_BAD_CHARS_UNIX = re.compile(r"[%s]" % _BAD_CHARS)
RC_BAD_CHARS_WIN32 = re.compile(r"[%s:^\\]" % _BAD_CHARS)
FORCE_TOOL = False
def _find_sfx_header(xfile):
sig = RAR_ID[:-1]
buf = io.BytesIO()
steps = (64, SFX_MAX_SIZE)
with XFile(xfile) as fd:
for step in steps:
data = fd.read(step)
if not data:
break
buf.write(data)
curdata = buf.getvalue()
findpos = 0
while True:
pos = curdata.find(sig, findpos)
if pos < 0:
break
if curdata[pos:pos + len(RAR_ID)] == RAR_ID:
return RAR_V3, pos
if curdata[pos:pos + len(RAR5_ID)] == RAR5_ID:
return RAR_V5, pos
findpos = pos + len(sig)
return 0, 0
##
## Public interface
##
def get_rar_version(xfile):
"""Check quickly whether file is rar archive.
"""
with XFile(xfile) as fd:
buf = fd.read(len(RAR5_ID))
if buf.startswith(RAR_ID):
return RAR_V3
elif buf.startswith(RAR5_ID):
return RAR_V5
return 0
def is_rarfile(xfile):
"""Check quickly whether file is rar archive.
"""
try:
return get_rar_version(xfile) > 0
except OSError:
# File not found or not accessible, ignore
return False
def is_rarfile_sfx(xfile):
"""Check whether file is rar archive with support for SFX.
It will read 2M from file.
"""
return _find_sfx_header(xfile)[0] > 0
class Error(Exception):
"""Base class for rarfile errors."""
class BadRarFile(Error):
"""Incorrect data in archive."""
class NotRarFile(Error):
"""The file is not RAR archive."""
class BadRarName(Error):
"""Cannot guess multipart name components."""
class NoRarEntry(Error):
"""File not found in RAR"""
class PasswordRequired(Error):
"""File requires password"""
class NeedFirstVolume(Error):
"""Need to start from first volume.
Attributes:
current_volume
Volume number of current file or None if not known
"""
def __init__(self, msg, volume):
super().__init__(msg)
self.current_volume = volume
class NoCrypto(Error):
"""Cannot parse encrypted headers - no crypto available."""
class RarExecError(Error):
"""Problem reported by unrar/rar."""
class RarWarning(RarExecError):
"""Non-fatal error"""
class RarFatalError(RarExecError):
"""Fatal error"""
class RarCRCError(RarExecError):
"""CRC error during unpacking"""
class RarLockedArchiveError(RarExecError):
"""Must not modify locked archive"""
class RarWriteError(RarExecError):
"""Write error"""
class RarOpenError(RarExecError):
"""Open error"""
class RarUserError(RarExecError):
"""User error"""
class RarMemoryError(RarExecError):
"""Memory error"""
class RarCreateError(RarExecError):
"""Create error"""
class RarNoFilesError(RarExecError):
"""No files that match pattern were found"""
class RarUserBreak(RarExecError):
"""User stop"""
class RarWrongPassword(RarExecError):
"""Incorrect password"""
class RarUnknownError(RarExecError):
"""Unknown exit code"""
class RarSignalExit(RarExecError):
"""Unrar exited with signal"""
class RarCannotExec(RarExecError):
"""Executable not found."""
class UnsupportedWarning(UserWarning):
"""Archive uses feature that are unsupported by rarfile.
.. versionadded:: 4.0
"""
class RarInfo:
r"""An entry in rar archive.
Timestamps as :class:`~datetime.datetime` are without timezone in RAR3,
with UTC timezone in RAR5 archives.
Attributes:
filename
File name with relative path.
Path separator is "/". Always unicode string.
date_time
File modification timestamp. As tuple of (year, month, day, hour, minute, second).
RAR5 allows archives where it is missing, it's None then.
comment
Optional file comment field. Unicode string. (RAR3-only)
file_size
Uncompressed size.
compress_size
Compressed size.
compress_type
Compression method: one of :data:`RAR_M0` .. :data:`RAR_M5` constants.
extract_version
Minimal Rar version needed for decompressing. As (major*10 + minor),
so 2.9 is 29.
RAR3: 10, 20, 29
RAR5 does not have such field in archive, it's simply set to 50.
host_os
Host OS type, one of RAR_OS_* constants.
RAR3: :data:`RAR_OS_WIN32`, :data:`RAR_OS_UNIX`, :data:`RAR_OS_MSDOS`,
:data:`RAR_OS_OS2`, :data:`RAR_OS_BEOS`.
RAR5: :data:`RAR_OS_WIN32`, :data:`RAR_OS_UNIX`.
mode
File attributes. May be either dos-style or unix-style, depending on host_os.
mtime
File modification time. Same value as :attr:`date_time`
but as :class:`~datetime.datetime` object with extended precision.
ctime
Optional time field: creation time. As :class:`~datetime.datetime` object.
atime
Optional time field: last access time. As :class:`~datetime.datetime` object.
arctime
Optional time field: archival time. As :class:`~datetime.datetime` object.
(RAR3-only)
CRC
CRC-32 of uncompressed file, unsigned int.
RAR5: may be None.
blake2sp_hash
Blake2SP hash over decompressed data. (RAR5-only)
volume
Volume nr, starting from 0.
volume_file
Volume file name, where file starts.
file_redir
If not None, file is link of some sort. Contains tuple of (type, flags, target).
(RAR5-only)
Type is one of constants:
:data:`RAR5_XREDIR_UNIX_SYMLINK`
Unix symlink.
:data:`RAR5_XREDIR_WINDOWS_SYMLINK`
Windows symlink.
:data:`RAR5_XREDIR_WINDOWS_JUNCTION`
Windows junction.
:data:`RAR5_XREDIR_HARD_LINK`
Hard link to target.
:data:`RAR5_XREDIR_FILE_COPY`
Current file is copy of another archive entry.
Flags may contain bits:
:data:`RAR5_XREDIR_ISDIR`
Symlink points to directory.
"""
# zipfile-compatible fields
filename = None
file_size = None
compress_size = None
date_time = None
CRC = None
volume = None
orig_filename = None
# optional extended time fields, datetime() objects.
mtime = None
ctime = None
atime = None
extract_version = None
mode = None
host_os = None
compress_type = None
# rar3-only fields
comment = None
arctime = None
# rar5-only fields
blake2sp_hash = None
file_redir = None
# internal fields
flags = 0
type = None
# zipfile compat
def is_dir(self):
"""Returns True if entry is a directory.
.. versionadded:: 4.0
"""
return False
def is_symlink(self):
"""Returns True if entry is a symlink.
.. versionadded:: 4.0
"""
return False
def is_file(self):
"""Returns True if entry is a normal file.
.. versionadded:: 4.0
"""
return False
def needs_password(self):
"""Returns True if data is stored password-protected.
"""
if self.type == RAR_BLOCK_FILE:
return (self.flags & RAR_FILE_PASSWORD) > 0
return False
def isdir(self):
"""Returns True if entry is a directory.
.. deprecated:: 4.0
"""
return self.is_dir()
class RarFile:
"""Parse RAR structure, provide access to files in archive.
Parameters:
file
archive file name or file-like object.
mode
only "r" is supported.
charset
fallback charset to use, if filenames are not already Unicode-enabled.
info_callback
debug callback, gets to see all archive entries.
crc_check
set to False to disable CRC checks
errors
Either "stop" to quietly stop parsing on errors,
or "strict" to raise errors. Default is "stop".
part_only
If True, read only single file and allow it to be middle-part
of multi-volume archive.
"""
#: File name, if available. Unicode string or None.
filename = None
#: Archive comment. Unicode string or None.
comment = None
def __init__(self, file, mode="r", charset=None, info_callback=None,
crc_check=True, errors="stop", part_only=False):
if is_filelike(file):
self.filename = getattr(file, "name", None)
else:
if isinstance(file, Path):
file = str(file)
self.filename = file
self._rarfile = file
self._charset = charset or DEFAULT_CHARSET
self._info_callback = info_callback
self._crc_check = crc_check
self._part_only = part_only
self._password = None
self._file_parser = None
if errors == "stop":
self._strict = False
elif errors == "strict":
self._strict = True
else:
raise ValueError("Invalid value for errors= parameter.")
if mode != "r":
raise NotImplementedError("RarFile supports only mode=r")
self._parse()
def __enter__(self):
"""Open context."""
return self
def __exit__(self, typ, value, traceback):
"""Exit context."""
self.close()
def __iter__(self):
"""Iterate over members."""
return iter(self.infolist())
def setpassword(self, pwd):
"""Sets the password to use when extracting.
"""
self._password = pwd
if self._file_parser:
if self._file_parser.has_header_encryption():
self._file_parser = None
if not self._file_parser:
self._parse()
else:
self._file_parser.setpassword(self._password)
def needs_password(self):
"""Returns True if any archive entries require password for extraction.
"""
return self._file_parser.needs_password()
def namelist(self):
"""Return list of filenames in archive.
"""
return [f.filename for f in self.infolist()]
def infolist(self):
"""Return RarInfo objects for all files/directories in archive.
"""
return self._file_parser.infolist()
def volumelist(self):
"""Returns filenames of archive volumes.
In case of single-volume archive, the list contains
just the name of main archive file.
"""
return self._file_parser.volumelist()
def getinfo(self, name):
"""Return RarInfo for file.
"""
return self._file_parser.getinfo(name)
def getinfo_orig(self, name):
"""Return RarInfo for file source.
RAR5: if name is hard-linked or copied file,
returns original entry with original filename.
"""
return self._file_parser.getinfo_orig(name)
def open(self, name, mode="r", pwd=None):
"""Returns file-like object (:class:`RarExtFile`) from where the data can be read.
The object implements :class:`io.RawIOBase` interface, so it can
be further wrapped with :class:`io.BufferedReader`
and :class:`io.TextIOWrapper`.
On older Python where io module is not available, it implements
only .read(), .seek(), .tell() and .close() methods.
The object is seekable, although the seeking is fast only on
uncompressed files, on compressed files the seeking is implemented
by reading ahead and/or restarting the decompression.
Parameters:
name
file name or RarInfo instance.
mode
must be "r"
pwd
password to use for extracting.
"""
if mode != "r":
raise NotImplementedError("RarFile.open() supports only mode=r")
# entry lookup
inf = self.getinfo(name)
if inf.is_dir():
raise io.UnsupportedOperation("Directory does not have any data: " + inf.filename)
# check password
if inf.needs_password():
pwd = pwd or self._password
if pwd is None:
raise PasswordRequired("File %s requires password" % inf.filename)
else:
pwd = None
return self._file_parser.open(inf, pwd)
def read(self, name, pwd=None):
"""Return uncompressed data for archive entry.
For longer files using :meth:`~RarFile.open` may be better idea.
Parameters:
name
filename or RarInfo instance
pwd
password to use for extracting.
"""
with self.open(name, "r", pwd) as f:
return f.read()
def close(self):
"""Release open resources."""
pass
def printdir(self, file=None):
"""Print archive file list to stdout or given file.
"""
if file is None:
file = sys.stdout
for f in self.infolist():
print(f.filename, file=file)
def extract(self, member, path=None, pwd=None):
"""Extract single file into current directory.
Parameters:
member
filename or :class:`RarInfo` instance
path
optional destination path
pwd
optional password to use
"""
inf = self.getinfo(member)
return self._extract_one(inf, path, pwd, True)
def extractall(self, path=None, members=None, pwd=None):
"""Extract all files into current directory.
Parameters:
path
optional destination path
members
optional filename or :class:`RarInfo` instance list to extract
pwd
optional password to use
"""
if members is None:
members = self.namelist()
done = set()
dirs = []
for m in members:
inf = self.getinfo(m)
dst = self._extract_one(inf, path, pwd, not inf.is_dir())
if inf.is_dir():
if dst not in done:
dirs.append((dst, inf))
done.add(dst)
if dirs:
dirs.sort(reverse=True)
for dst, inf in dirs:
self._set_attrs(inf, dst)
def testrar(self, pwd=None):
"""Read all files and test CRC.
"""
for member in self.infolist():
if member.is_file():
with self.open(member, 'r', pwd) as f:
empty_read(f, member.file_size, BSIZE)
def strerror(self):
"""Return error string if parsing failed or None if no problems.
"""
if not self._file_parser:
return "Not a RAR file"
return self._file_parser.strerror()
##
## private methods
##
def _parse(self):
"""Run parser for file type
"""
ver, sfx_ofs = _find_sfx_header(self._rarfile)
if ver == RAR_V3:
p3 = RAR3Parser(self._rarfile, self._password, self._crc_check,
self._charset, self._strict, self._info_callback,
sfx_ofs, self._part_only)
self._file_parser = p3 # noqa
elif ver == RAR_V5:
p5 = RAR5Parser(self._rarfile, self._password, self._crc_check,
self._charset, self._strict, self._info_callback,
sfx_ofs, self._part_only)
self._file_parser = p5 # noqa
else:
raise NotRarFile("Not a RAR file")
self._file_parser.parse()
self.comment = self._file_parser.comment
def _extract_one(self, info, path, pwd, set_attrs):
fname = sanitize_filename(
info.filename, os.path.sep, WIN32
)
if path is None:
path = os.getcwd()
else:
path = os.fspath(path)
dstfn = os.path.join(path, fname)
dirname = os.path.dirname(dstfn)
if dirname and dirname != ".":
os.makedirs(dirname, exist_ok=True)
if info.is_file():
return self._make_file(info, dstfn, pwd, set_attrs)
if info.is_dir():
return self._make_dir(info, dstfn, pwd, set_attrs)
if info.is_symlink():
return self._make_symlink(info, dstfn, pwd, set_attrs)
return None
def _create_helper(self, name, flags, info):
return os.open(name, flags)
def _make_file(self, info, dstfn, pwd, set_attrs):
def helper(name, flags):
return self._create_helper(name, flags, info)
with self.open(info, "r", pwd) as src:
with open(dstfn, "wb", opener=helper) as dst:
shutil.copyfileobj(src, dst)
if set_attrs:
self._set_attrs(info, dstfn)
return dstfn
def _make_dir(self, info, dstfn, pwd, set_attrs):
os.makedirs(dstfn, exist_ok=True)
if set_attrs:
self._set_attrs(info, dstfn)
return dstfn
def _make_symlink(self, info, dstfn, pwd, set_attrs):
target_is_directory = False
if info.host_os == RAR_OS_UNIX:
link_name = self.read(info, pwd)
target_is_directory = (info.flags & RAR_FILE_DIRECTORY) == RAR_FILE_DIRECTORY
elif info.file_redir:
redir_type, redir_flags, link_name = info.file_redir
if redir_type == RAR5_XREDIR_WINDOWS_JUNCTION:
warnings.warn(f"Windows junction not supported - {info.filename}", UnsupportedWarning)
return None
target_is_directory = (redir_type & RAR5_XREDIR_ISDIR) > 0
else:
warnings.warn(f"Unsupported link type - {info.filename}", UnsupportedWarning)
return None
os.symlink(link_name, dstfn, target_is_directory=target_is_directory)
return dstfn
def _set_attrs(self, info, dstfn):
if info.host_os == RAR_OS_UNIX:
os.chmod(dstfn, info.mode & 0o777)
elif info.host_os in (RAR_OS_WIN32, RAR_OS_MSDOS):
# only keep R/O attr, except for dirs on win32
if info.mode & DOS_MODE_READONLY and (info.is_file() or not WIN32):
st = os.stat(dstfn)
new_mode = st.st_mode & ~0o222
os.chmod(dstfn, new_mode)
if info.mtime:
mtime_ns = to_nsecs(info.mtime)
atime_ns = to_nsecs(info.atime) if info.atime else mtime_ns
os.utime(dstfn, ns=(atime_ns, mtime_ns))
#
# File format parsing
#
class CommonParser:
"""Shared parser parts."""
_main = None
_hdrenc_main = None
_needs_password = False
_fd = None
_expect_sig = None
_parse_error = None
_password = None
comment = None
def __init__(self, rarfile, password, crc_check, charset, strict,
info_cb, sfx_offset, part_only):
self._rarfile = rarfile
self._password = password
self._crc_check = crc_check
self._charset = charset
self._strict = strict
self._info_callback = info_cb
self._info_list = []
self._info_map = {}
self._vol_list = []
self._sfx_offset = sfx_offset
self._part_only = part_only
def has_header_encryption(self):
"""Returns True if headers are encrypted
"""
if self._hdrenc_main:
return True
if self._main:
if self._main.flags & RAR_MAIN_PASSWORD:
return True
return False
def setpassword(self, pwd):
"""Set cached password."""
self._password = pwd
def volumelist(self):
"""Volume files"""
return self._vol_list
def needs_password(self):
"""Is password required"""
return self._needs_password
def strerror(self):
"""Last error"""
return self._parse_error
def infolist(self):
"""List of RarInfo records.
"""
return self._info_list
def getinfo(self, member):
"""Return RarInfo for filename
"""
if isinstance(member, RarInfo):
fname = member.filename
elif isinstance(member, Path):
fname = str(member)
else:
fname = member
if fname.endswith("/"):
fname = fname.rstrip("/")
try:
return self._info_map[fname]
except KeyError:
raise NoRarEntry("No such file: %s" % fname) from None
def getinfo_orig(self, member):
inf = self.getinfo(member)
if inf.file_redir:
redir_type, redir_flags, redir_name = inf.file_redir
# cannot leave to unrar as it expects copied file to exist
if redir_type in (RAR5_XREDIR_FILE_COPY, RAR5_XREDIR_HARD_LINK):
inf = self.getinfo(redir_name)
return inf
def parse(self):
"""Process file."""
self._fd = None
try:
self._parse_real()
finally:
if self._fd:
self._fd.close()
self._fd = None
def _parse_real(self):
"""Actually read file.
"""
fd = XFile(self._rarfile)
self._fd = fd
fd.seek(self._sfx_offset, 0)
sig = fd.read(len(self._expect_sig))
if sig != self._expect_sig:
raise NotRarFile("Not a Rar archive")
volume = 0 # first vol (.rar) is 0
more_vols = False
endarc = False
volfile = self._rarfile
self._vol_list = [self._rarfile]
raise_need_first_vol = False
while True:
if endarc:
h = None # don"t read past ENDARC
else:
h = self._parse_header(fd)
if not h:
if raise_need_first_vol:
# did not find ENDARC with VOLNR
raise NeedFirstVolume("Need to start from first volume", None)
if more_vols and not self._part_only:
volume += 1
fd.close()
try:
volfile = self._next_volname(volfile)
fd = XFile(volfile)
except IOError:
self._set_error("Cannot open next volume: %s", volfile)
break
self._fd = fd
sig = fd.read(len(self._expect_sig))
if sig != self._expect_sig:
self._set_error("Invalid volume sig: %s", volfile)
break
more_vols = False
endarc = False
self._vol_list.append(volfile)
self._main = None
self._hdrenc_main = None
continue
break
h.volume = volume
h.volume_file = volfile
if h.type == RAR_BLOCK_MAIN and not self._main:
self._main = h
if volume == 0 and (h.flags & RAR_MAIN_NEWNUMBERING) and not self._part_only:
# RAR 2.x does not set FIRSTVOLUME,
# so check it only if NEWNUMBERING is used
if (h.flags & RAR_MAIN_FIRSTVOLUME) == 0:
if getattr(h, "main_volume_number", None) is not None:
# rar5 may have more info
raise NeedFirstVolume(
"Need to start from first volume (current: %r)"
% (h.main_volume_number,),
h.main_volume_number
)
# delay raise until we have volnr from ENDARC
raise_need_first_vol = True
if h.flags & RAR_MAIN_PASSWORD:
self._needs_password = True
if not self._password:
break
elif h.type == RAR_BLOCK_ENDARC:
more_vols = (h.flags & RAR_ENDARC_NEXT_VOLUME) > 0
endarc = True
if raise_need_first_vol and (h.flags & RAR_ENDARC_VOLNR) > 0:
raise NeedFirstVolume(
"Need to start from first volume (current: %r)"
% (h.endarc_volnr,),
h.endarc_volnr
)
elif h.type == RAR_BLOCK_FILE:
# RAR 2.x does not write RAR_BLOCK_ENDARC
if h.flags & RAR_FILE_SPLIT_AFTER:
more_vols = True
# RAR 2.x does not set RAR_MAIN_FIRSTVOLUME
if volume == 0 and h.flags & RAR_FILE_SPLIT_BEFORE:
if not self._part_only:
raise_need_first_vol = True
if h.needs_password():
self._needs_password = True
# store it
self.process_entry(fd, h)
if self._info_callback:
self._info_callback(h)
# go to next header
if h.add_size > 0:
fd.seek(h.data_offset + h.add_size, 0)
def process_entry(self, fd, item):
"""Examine item, add into lookup cache."""
raise NotImplementedError()
def _decrypt_header(self, fd):
raise NotImplementedError("_decrypt_header")
def _parse_block_header(self, fd):
raise NotImplementedError("_parse_block_header")
def _open_hack(self, inf, pwd):
raise NotImplementedError("_open_hack")
def _parse_header(self, fd):
"""Read single header
"""
try:
# handle encrypted headers
if (self._main and self._main.flags & RAR_MAIN_PASSWORD) or self._hdrenc_main:
if not self._password:
return None
fd = self._decrypt_header(fd)
# now read actual header
return self._parse_block_header(fd)
except struct.error:
self._set_error("Broken header in RAR file")
return None
def _next_volname(self, volfile):
"""Given current vol name, construct next one
"""
if is_filelike(volfile):
raise IOError("Working on single FD")
if self._main.flags & RAR_MAIN_NEWNUMBERING:
return _next_newvol(volfile)
return _next_oldvol(volfile)
def _set_error(self, msg, *args):
if args:
msg = msg % args
self._parse_error = msg
if self._strict:
raise BadRarFile(msg)
def open(self, inf, pwd):
"""Return stream object for file data."""
if inf.file_redir:
redir_type, redir_flags, redir_name = inf.file_redir
# cannot leave to unrar as it expects copied file to exist
if redir_type in (RAR5_XREDIR_FILE_COPY, RAR5_XREDIR_HARD_LINK):
inf = self.getinfo(redir_name)
if not inf:
raise BadRarFile("cannot find copied file")
elif redir_type in (
RAR5_XREDIR_UNIX_SYMLINK, RAR5_XREDIR_WINDOWS_SYMLINK,
RAR5_XREDIR_WINDOWS_JUNCTION,
):
return io.BytesIO(redir_name.encode("utf8"))
if inf.flags & RAR_FILE_SPLIT_BEFORE:
raise NeedFirstVolume("Partial file, please start from first volume: " + inf.filename, None)
# is temp write usable?
use_hack = 1
if not self._main:
use_hack = 0
elif self._main._must_disable_hack():
use_hack = 0
elif inf._must_disable_hack():
use_hack = 0
elif is_filelike(self._rarfile):
pass
elif inf.file_size > HACK_SIZE_LIMIT:
use_hack = 0
elif not USE_EXTRACT_HACK:
use_hack = 0
# now extract
if inf.compress_type == RAR_M0 and (inf.flags & RAR_FILE_PASSWORD) == 0 and inf.file_redir is None:
return self._open_clear(inf)
elif use_hack:
return self._open_hack(inf, pwd)
elif is_filelike(self._rarfile):
return self._open_unrar_membuf(self._rarfile, inf, pwd)
else:
return self._open_unrar(self._rarfile, inf, pwd)
def _open_clear(self, inf):
if FORCE_TOOL:
return self._open_unrar(self._rarfile, inf)
return DirectReader(self, inf)
def _open_hack_core(self, inf, pwd, prefix, suffix):
size = inf.compress_size + inf.header_size
rf = XFile(inf.volume_file, 0)
rf.seek(inf.header_offset)
tmpfd, tmpname = mkstemp(suffix=".rar", dir=HACK_TMP_DIR)
tmpf = os.fdopen(tmpfd, "wb")
try:
tmpf.write(prefix)
while size > 0:
if size > BSIZE:
buf = rf.read(BSIZE)
else:
buf = rf.read(size)
if not buf:
raise BadRarFile("read failed: " + inf.filename)
tmpf.write(buf)
size -= len(buf)
tmpf.write(suffix)
tmpf.close()
rf.close()
except BaseException:
rf.close()
tmpf.close()
os.unlink(tmpname)
raise
return self._open_unrar(tmpname, inf, pwd, tmpname)
def _open_unrar_membuf(self, memfile, inf, pwd):
"""Write in-memory archive to temp file, needed for solid archives.
"""
tmpname = membuf_tempfile(memfile)
return self._open_unrar(tmpname, inf, pwd, tmpname, force_file=True)
def _open_unrar(self, rarfile, inf, pwd=None, tmpfile=None, force_file=False):
"""Extract using unrar
"""
setup = tool_setup()
# not giving filename avoids encoding related problems
fn = None
if not tmpfile or force_file:
fn = inf.filename.replace("/", os.path.sep)
# read from unrar pipe
cmd = setup.open_cmdline(pwd, rarfile, fn)
return PipeReader(self, inf, cmd, tmpfile)
#
# RAR3 format
#
class Rar3Info(RarInfo):
"""RAR3 specific fields."""
extract_version = 15
salt = None
add_size = 0
header_crc = None
header_size = None
header_offset = None
data_offset = None
_md_class = None
_md_expect = None
_name_size = None
# make sure some rar5 fields are always present
file_redir = None
blake2sp_hash = None
endarc_datacrc = None
endarc_volnr = None
def _must_disable_hack(self):
if self.type == RAR_BLOCK_FILE:
if self.flags & RAR_FILE_PASSWORD:
return True
elif self.flags & (RAR_FILE_SPLIT_BEFORE | RAR_FILE_SPLIT_AFTER):
return True
elif self.type == RAR_BLOCK_MAIN:
if self.flags & (RAR_MAIN_SOLID | RAR_MAIN_PASSWORD):
return True
return False
def is_dir(self):
"""Returns True if entry is a directory."""
if self.type == RAR_BLOCK_FILE and not self.is_symlink():
return (self.flags & RAR_FILE_DIRECTORY) == RAR_FILE_DIRECTORY
return False
def is_symlink(self):
"""Returns True if entry is a symlink."""
return (
self.type == RAR_BLOCK_FILE and
self.host_os == RAR_OS_UNIX and
self.mode & 0xF000 == 0xA000
)
def is_file(self):
"""Returns True if entry is a normal file."""
return (
self.type == RAR_BLOCK_FILE and
not (self.is_dir() or self.is_symlink())
)
class RAR3Parser(CommonParser):
"""Parse RAR3 file format.
"""
_expect_sig = RAR_ID
_last_aes_key = (None, None, None) # (salt, key, iv)
def _decrypt_header(self, fd):
if not _have_crypto:
raise NoCrypto("Cannot parse encrypted headers - no crypto")
salt = fd.read(8)
if self._last_aes_key[0] == salt:
key, iv = self._last_aes_key[1:]
else:
key, iv = rar3_s2k(self._password, salt)
self._last_aes_key = (salt, key, iv)
return HeaderDecrypt(fd, key, iv)
def _parse_block_header(self, fd):
"""Parse common block header
"""
h = Rar3Info()
h.header_offset = fd.tell()
# read and parse base header
buf = fd.read(S_BLK_HDR.size)
if not buf:
return None
if len(buf) < S_BLK_HDR.size:
self._set_error("Unexpected EOF when reading header")
return None
t = S_BLK_HDR.unpack_from(buf)
h.header_crc, h.type, h.flags, h.header_size = t
# read full header
if h.header_size > S_BLK_HDR.size:
hdata = buf + fd.read(h.header_size - S_BLK_HDR.size)
else:
hdata = buf
h.data_offset = fd.tell()
# unexpected EOF?
if len(hdata) != h.header_size:
self._set_error("Unexpected EOF when reading header")
return None
pos = S_BLK_HDR.size
# block has data assiciated with it?
if h.flags & RAR_LONG_BLOCK:
h.add_size, pos = load_le32(hdata, pos)
else:
h.add_size = 0
# parse interesting ones, decide header boundaries for crc
if h.type == RAR_BLOCK_MARK:
return h
elif h.type == RAR_BLOCK_MAIN:
pos += 6
if h.flags & RAR_MAIN_ENCRYPTVER:
pos += 1
crc_pos = pos
if h.flags & RAR_MAIN_COMMENT:
self._parse_subblocks(h, hdata, pos)
elif h.type == RAR_BLOCK_FILE:
pos = self._parse_file_header(h, hdata, pos - 4)
crc_pos = pos
if h.flags & RAR_FILE_COMMENT:
pos = self._parse_subblocks(h, hdata, pos)
elif h.type == RAR_BLOCK_SUB:
pos = self._parse_file_header(h, hdata, pos - 4)
crc_pos = h.header_size
elif h.type == RAR_BLOCK_OLD_AUTH:
pos += 8
crc_pos = pos
elif h.type == RAR_BLOCK_OLD_EXTRA:
pos += 7
crc_pos = pos
elif h.type == RAR_BLOCK_ENDARC:
if h.flags & RAR_ENDARC_DATACRC:
h.endarc_datacrc, pos = load_le32(hdata, pos)
if h.flags & RAR_ENDARC_VOLNR:
h.endarc_volnr = S_SHORT.unpack_from(hdata, pos)[0]
pos += 2
crc_pos = h.header_size
else:
crc_pos = h.header_size
# check crc
if h.type == RAR_BLOCK_OLD_SUB:
crcdat = hdata[2:] + fd.read(h.add_size)
else:
crcdat = hdata[2:crc_pos]
calc_crc = crc32(crcdat) & 0xFFFF
# return good header
if h.header_crc == calc_crc:
return h
# header parsing failed.
self._set_error("Header CRC error (%02x): exp=%x got=%x (xlen = %d)",
h.type, h.header_crc, calc_crc, len(crcdat))
# instead panicing, send eof
return None
def _parse_file_header(self, h, hdata, pos):
"""Read file-specific header
"""
fld = S_FILE_HDR.unpack_from(hdata, pos)
pos += S_FILE_HDR.size
h.compress_size = fld[0]
h.file_size = fld[1]
h.host_os = fld[2]
h.CRC = fld[3]
h.date_time = parse_dos_time(fld[4])
h.mtime = to_datetime(h.date_time)
h.extract_version = fld[5]
h.compress_type = fld[6]
h._name_size = name_size = fld[7]
h.mode = fld[8]
h._md_class = CRC32Context
h._md_expect = h.CRC
if h.flags & RAR_FILE_LARGE:
h1, pos = load_le32(hdata, pos)
h2, pos = load_le32(hdata, pos)
h.compress_size |= h1 << 32
h.file_size |= h2 << 32
h.add_size = h.compress_size
name, pos = load_bytes(hdata, name_size, pos)
if h.flags & RAR_FILE_UNICODE and b"\0" in name:
# stored in custom encoding
nul = name.find(b"\0")
h.orig_filename = name[:nul]
u = UnicodeFilename(h.orig_filename, name[nul + 1:])
h.filename = u.decode()
# if parsing failed fall back to simple name
if u.failed:
h.filename = self._decode(h.orig_filename)
elif h.flags & RAR_FILE_UNICODE:
# stored in UTF8
h.orig_filename = name
h.filename = name.decode("utf8", "replace")
else:
# stored in random encoding
h.orig_filename = name
h.filename = self._decode(name)
# change separator, set dir suffix
h.filename = h.filename.replace("\\", "/").rstrip("/")
if h.is_dir():
h.filename = h.filename + "/"
if h.flags & RAR_FILE_SALT:
h.salt, pos = load_bytes(hdata, 8, pos)
else:
h.salt = None
# optional extended time stamps
if h.flags & RAR_FILE_EXTTIME:
pos = _parse_ext_time(h, hdata, pos)
else:
h.mtime = h.atime = h.ctime = h.arctime = None
return pos
def _parse_subblocks(self, h, hdata, pos):
"""Find old-style comment subblock
"""
while pos < len(hdata):
# ordinary block header
t = S_BLK_HDR.unpack_from(hdata, pos)
___scrc, stype, sflags, slen = t
pos_next = pos + slen
pos += S_BLK_HDR.size
# corrupt header
if pos_next < pos:
break
# followed by block-specific header
if stype == RAR_BLOCK_OLD_COMMENT and pos + S_COMMENT_HDR.size <= pos_next:
declen, ver, meth, crc = S_COMMENT_HDR.unpack_from(hdata, pos)
pos += S_COMMENT_HDR.size
data = hdata[pos: pos_next]
cmt = rar3_decompress(ver, meth, data, declen, sflags,
crc, self._password)
if not self._crc_check or (crc32(cmt) & 0xFFFF == crc):
h.comment = self._decode_comment(cmt)
pos = pos_next
return pos
def _read_comment_v3(self, inf, pwd=None):
# read data
with XFile(inf.volume_file) as rf:
rf.seek(inf.data_offset)
data = rf.read(inf.compress_size)
# decompress
cmt = rar3_decompress(inf.extract_version, inf.compress_type, data,
inf.file_size, inf.flags, inf.CRC, pwd, inf.salt)
# check crc
if self._crc_check:
crc = crc32(cmt)
if crc != inf.CRC:
return None
return self._decode_comment(cmt)
def _decode(self, val):
for c in TRY_ENCODINGS:
try:
return val.decode(c)
except UnicodeError:
pass
return val.decode(self._charset, "replace")
def _decode_comment(self, val):
return self._decode(val)
def process_entry(self, fd, item):
if item.type == RAR_BLOCK_FILE:
# use only first part
if item.flags & RAR_FILE_VERSION:
pass # skip old versions
elif (item.flags & RAR_FILE_SPLIT_BEFORE) == 0:
self._info_map[item.filename.rstrip("/")] = item
self._info_list.append(item)
elif len(self._info_list) > 0:
# final crc is in last block
old = self._info_list[-1]
old.CRC = item.CRC
old._md_expect = item._md_expect
old.compress_size += item.compress_size
# parse new-style comment
if item.type == RAR_BLOCK_SUB and item.filename == "CMT":
if item.flags & (RAR_FILE_SPLIT_BEFORE | RAR_FILE_SPLIT_AFTER):
pass
elif item.flags & RAR_FILE_SOLID:
# file comment
cmt = self._read_comment_v3(item, self._password)
if len(self._info_list) > 0:
old = self._info_list[-1]
old.comment = cmt
else:
# archive comment
cmt = self._read_comment_v3(item, self._password)
self.comment = cmt
if item.type == RAR_BLOCK_MAIN:
if item.flags & RAR_MAIN_COMMENT:
self.comment = item.comment
if item.flags & RAR_MAIN_PASSWORD:
self._needs_password = True
# put file compressed data into temporary .rar archive, and run
# unrar on that, thus avoiding unrar going over whole archive
def _open_hack(self, inf, pwd):
# create main header: crc, type, flags, size, res1, res2
prefix = RAR_ID + S_BLK_HDR.pack(0x90CF, 0x73, 0, 13) + b"\0" * (2 + 4)
return self._open_hack_core(inf, pwd, prefix, b"")
#
# RAR5 format
#
class Rar5Info(RarInfo):
"""Shared fields for RAR5 records.
"""
extract_version = 50
header_crc = None
header_size = None
header_offset = None
data_offset = None
# type=all
block_type = None
block_flags = None
add_size = 0
block_extra_size = 0
# type=MAIN
volume_number = None
_md_class = None
_md_expect = None
def _must_disable_hack(self):
return False
class Rar5BaseFile(Rar5Info):
"""Shared sturct for file & service record.
"""
type = -1
file_flags = None
file_encryption = (0, 0, 0, b"", b"", b"")
file_compress_flags = None
file_redir = None
file_owner = None
file_version = None
blake2sp_hash = None
def _must_disable_hack(self):
if self.flags & RAR_FILE_PASSWORD:
return True
if self.block_flags & (RAR5_BLOCK_FLAG_SPLIT_BEFORE | RAR5_BLOCK_FLAG_SPLIT_AFTER):
return True
if self.file_compress_flags & RAR5_COMPR_SOLID:
return True
if self.file_redir:
return True
return False
class Rar5FileInfo(Rar5BaseFile):
"""RAR5 file record.
"""
type = RAR_BLOCK_FILE
def is_symlink(self):
"""Returns True if entry is a symlink."""
# pylint: disable=unsubscriptable-object
return (
self.file_redir is not None and
self.file_redir[0] in (
RAR5_XREDIR_UNIX_SYMLINK,
RAR5_XREDIR_WINDOWS_SYMLINK,
RAR5_XREDIR_WINDOWS_JUNCTION,
)
)
def is_file(self):
"""Returns True if entry is a normal file."""
return not (self.is_dir() or self.is_symlink())
def is_dir(self):
"""Returns True if entry is a directory."""
if not self.file_redir:
if self.file_flags & RAR5_FILE_FLAG_ISDIR:
return True
return False
class Rar5ServiceInfo(Rar5BaseFile):
"""RAR5 service record.
"""
type = RAR_BLOCK_SUB
class Rar5MainInfo(Rar5Info):
"""RAR5 archive main record.
"""
type = RAR_BLOCK_MAIN
main_flags = None
main_volume_number = None
def _must_disable_hack(self):
if self.main_flags & RAR5_MAIN_FLAG_SOLID:
return True
return False
class Rar5EncryptionInfo(Rar5Info):
"""RAR5 archive header encryption record.
"""
type = RAR5_BLOCK_ENCRYPTION
encryption_algo = None
encryption_flags = None
encryption_kdf_count = None
encryption_salt = None
encryption_check_value = None
def needs_password(self):
return True
class Rar5EndArcInfo(Rar5Info):
"""RAR5 end of archive record.
"""
type = RAR_BLOCK_ENDARC
endarc_flags = None
class RAR5Parser(CommonParser):
"""Parse RAR5 format.
"""
_expect_sig = RAR5_ID
_hdrenc_main = None
# AES encrypted headers
_last_aes256_key = (-1, None, None) # (kdf_count, salt, key)
def _get_utf8_password(self):
pwd = self._password
if isinstance(pwd, str):
return pwd.encode("utf8")
return pwd
def _gen_key(self, kdf_count, salt):
if self._last_aes256_key[:2] == (kdf_count, salt):
return self._last_aes256_key[2]
if kdf_count > 24:
raise BadRarFile("Too large kdf_count")
pwd = self._get_utf8_password()
key = pbkdf2_hmac("sha256", pwd, salt, 1 << kdf_count)
self._last_aes256_key = (kdf_count, salt, key)
return key
def _decrypt_header(self, fd):
if not _have_crypto:
raise NoCrypto("Cannot parse encrypted headers - no crypto")
h = self._hdrenc_main
key = self._gen_key(h.encryption_kdf_count, h.encryption_salt)
iv = fd.read(16)
return HeaderDecrypt(fd, key, iv)
def _parse_block_header(self, fd):
"""Parse common block header
"""
header_offset = fd.tell()
preload = 4 + 1
start_bytes = fd.read(preload)
if len(start_bytes) < preload:
self._set_error("Unexpected EOF when reading header")
return None
while start_bytes[-1] & 0x80:
b = fd.read(1)
if not b:
self._set_error("Unexpected EOF when reading header")
return None
start_bytes += b
header_crc, pos = load_le32(start_bytes, 0)
hdrlen, pos = load_vint(start_bytes, pos)
if hdrlen > 2 * 1024 * 1024:
return None
header_size = pos + hdrlen
# read full header, check for EOF
hdata = start_bytes + fd.read(header_size - len(start_bytes))
if len(hdata) != header_size:
self._set_error("Unexpected EOF when reading header")
return None
data_offset = fd.tell()
calc_crc = crc32(memoryview(hdata)[4:])
if header_crc != calc_crc:
# header parsing failed.
self._set_error("Header CRC error: exp=%x got=%x (xlen = %d)",
header_crc, calc_crc, len(hdata))
return None
block_type, pos = load_vint(hdata, pos)
if block_type == RAR5_BLOCK_MAIN:
h, pos = self._parse_block_common(Rar5MainInfo(), hdata)
h = self._parse_main_block(h, hdata, pos)
elif block_type == RAR5_BLOCK_FILE:
h, pos = self._parse_block_common(Rar5FileInfo(), hdata)
h = self._parse_file_block(h, hdata, pos)
elif block_type == RAR5_BLOCK_SERVICE:
h, pos = self._parse_block_common(Rar5ServiceInfo(), hdata)
h = self._parse_file_block(h, hdata, pos)
elif block_type == RAR5_BLOCK_ENCRYPTION:
h, pos = self._parse_block_common(Rar5EncryptionInfo(), hdata)
h = self._parse_encryption_block(h, hdata, pos)
elif block_type == RAR5_BLOCK_ENDARC:
h, pos = self._parse_block_common(Rar5EndArcInfo(), hdata)
h = self._parse_endarc_block(h, hdata, pos)
else:
h = None
if h:
h.header_offset = header_offset
h.data_offset = data_offset
return h
def _parse_block_common(self, h, hdata):
h.header_crc, pos = load_le32(hdata, 0)
hdrlen, pos = load_vint(hdata, pos)
h.header_size = hdrlen + pos
h.block_type, pos = load_vint(hdata, pos)
h.block_flags, pos = load_vint(hdata, pos)
if h.block_flags & RAR5_BLOCK_FLAG_EXTRA_DATA:
h.block_extra_size, pos = load_vint(hdata, pos)
if h.block_flags & RAR5_BLOCK_FLAG_DATA_AREA:
h.add_size, pos = load_vint(hdata, pos)
h.compress_size = h.add_size
if h.block_flags & RAR5_BLOCK_FLAG_SKIP_IF_UNKNOWN:
h.flags |= RAR_SKIP_IF_UNKNOWN
if h.block_flags & RAR5_BLOCK_FLAG_DATA_AREA:
h.flags |= RAR_LONG_BLOCK
return h, pos
def _parse_main_block(self, h, hdata, pos):
h.main_flags, pos = load_vint(hdata, pos)
if h.main_flags & RAR5_MAIN_FLAG_HAS_VOLNR:
h.main_volume_number, pos = load_vint(hdata, pos)
h.flags |= RAR_MAIN_NEWNUMBERING
if h.main_flags & RAR5_MAIN_FLAG_SOLID:
h.flags |= RAR_MAIN_SOLID
if h.main_flags & RAR5_MAIN_FLAG_ISVOL:
h.flags |= RAR_MAIN_VOLUME
if h.main_flags & RAR5_MAIN_FLAG_RECOVERY:
h.flags |= RAR_MAIN_RECOVERY
if self._hdrenc_main:
h.flags |= RAR_MAIN_PASSWORD
if h.main_flags & RAR5_MAIN_FLAG_HAS_VOLNR == 0:
h.flags |= RAR_MAIN_FIRSTVOLUME
return h
def _parse_file_block(self, h, hdata, pos):
h.file_flags, pos = load_vint(hdata, pos)
h.file_size, pos = load_vint(hdata, pos)
h.mode, pos = load_vint(hdata, pos)
if h.file_flags & RAR5_FILE_FLAG_HAS_MTIME:
h.mtime, pos = load_unixtime(hdata, pos)
h.date_time = h.mtime.timetuple()[:6]
if h.file_flags & RAR5_FILE_FLAG_HAS_CRC32:
h.CRC, pos = load_le32(hdata, pos)
h._md_class = CRC32Context
h._md_expect = h.CRC
h.file_compress_flags, pos = load_vint(hdata, pos)
h.file_host_os, pos = load_vint(hdata, pos)
h.orig_filename, pos = load_vstr(hdata, pos)
h.filename = h.orig_filename.decode("utf8", "replace").rstrip("/")
# use compatible values
if h.file_host_os == RAR5_OS_WINDOWS:
h.host_os = RAR_OS_WIN32
else:
h.host_os = RAR_OS_UNIX
h.compress_type = RAR_M0 + ((h.file_compress_flags >> 7) & 7)
if h.block_extra_size:
# allow 1 byte of garbage
while pos < len(hdata) - 1:
xsize, pos = load_vint(hdata, pos)
xdata, pos = load_bytes(hdata, xsize, pos)
self._process_file_extra(h, xdata)
if h.block_flags & RAR5_BLOCK_FLAG_SPLIT_BEFORE:
h.flags |= RAR_FILE_SPLIT_BEFORE
if h.block_flags & RAR5_BLOCK_FLAG_SPLIT_AFTER:
h.flags |= RAR_FILE_SPLIT_AFTER
if h.file_flags & RAR5_FILE_FLAG_ISDIR:
h.flags |= RAR_FILE_DIRECTORY
if h.file_compress_flags & RAR5_COMPR_SOLID:
h.flags |= RAR_FILE_SOLID
if h.is_dir():
h.filename = h.filename + "/"
return h
def _parse_endarc_block(self, h, hdata, pos):
h.endarc_flags, pos = load_vint(hdata, pos)
if h.endarc_flags & RAR5_ENDARC_FLAG_NEXT_VOL:
h.flags |= RAR_ENDARC_NEXT_VOLUME
return h
def _check_password(self, check_value, kdf_count_shift, salt):
if len(check_value) != RAR5_PW_CHECK_SIZE + RAR5_PW_SUM_SIZE:
return
hdr_check = check_value[:RAR5_PW_CHECK_SIZE]
hdr_sum = check_value[RAR5_PW_CHECK_SIZE:]
sum_hash = sha256(hdr_check).digest()
if sum_hash[:RAR5_PW_SUM_SIZE] != hdr_sum:
return
kdf_count = (1 << kdf_count_shift) + 32
pwd = self._get_utf8_password()
pwd_hash = pbkdf2_hmac("sha256", pwd, salt, kdf_count)
pwd_check = bytearray(RAR5_PW_CHECK_SIZE)
len_mask = RAR5_PW_CHECK_SIZE - 1
for i, v in enumerate(pwd_hash):
pwd_check[i & len_mask] ^= v
if pwd_check != hdr_check:
raise RarWrongPassword()
def _parse_encryption_block(self, h, hdata, pos):
h.encryption_algo, pos = load_vint(hdata, pos)
h.encryption_flags, pos = load_vint(hdata, pos)
h.encryption_kdf_count, pos = load_byte(hdata, pos)
h.encryption_salt, pos = load_bytes(hdata, 16, pos)
if h.encryption_flags & RAR5_ENC_FLAG_HAS_CHECKVAL:
h.encryption_check_value, pos = load_bytes(hdata, 12, pos)
if h.encryption_algo != RAR5_XENC_CIPHER_AES256:
raise BadRarFile("Unsupported header encryption cipher")
if h.encryption_check_value and self._password:
self._check_password(h.encryption_check_value, h.encryption_kdf_count, h.encryption_salt)
self._hdrenc_main = h
return h
def _process_file_extra(self, h, xdata):
xtype, pos = load_vint(xdata, 0)
if xtype == RAR5_XFILE_TIME:
self._parse_file_xtime(h, xdata, pos)
elif xtype == RAR5_XFILE_ENCRYPTION:
self._parse_file_encryption(h, xdata, pos)
elif xtype == RAR5_XFILE_HASH:
self._parse_file_hash(h, xdata, pos)
elif xtype == RAR5_XFILE_VERSION:
self._parse_file_version(h, xdata, pos)
elif xtype == RAR5_XFILE_REDIR:
self._parse_file_redir(h, xdata, pos)
elif xtype == RAR5_XFILE_OWNER:
self._parse_file_owner(h, xdata, pos)
elif xtype == RAR5_XFILE_SERVICE:
pass
else:
pass
# extra block for file time record
def _parse_file_xtime(self, h, xdata, pos):
tflags, pos = load_vint(xdata, pos)
ldr = load_windowstime
if tflags & RAR5_XTIME_UNIXTIME:
ldr = load_unixtime
if tflags & RAR5_XTIME_HAS_MTIME:
h.mtime, pos = ldr(xdata, pos)
h.date_time = h.mtime.timetuple()[:6]
if tflags & RAR5_XTIME_HAS_CTIME:
h.ctime, pos = ldr(xdata, pos)
if tflags & RAR5_XTIME_HAS_ATIME:
h.atime, pos = ldr(xdata, pos)
if tflags & RAR5_XTIME_UNIXTIME_NS:
if tflags & RAR5_XTIME_HAS_MTIME:
nsec, pos = load_le32(xdata, pos)
h.mtime = to_nsdatetime(h.mtime, nsec)
if tflags & RAR5_XTIME_HAS_CTIME:
nsec, pos = load_le32(xdata, pos)
h.ctime = to_nsdatetime(h.ctime, nsec)
if tflags & RAR5_XTIME_HAS_ATIME:
nsec, pos = load_le32(xdata, pos)
h.atime = to_nsdatetime(h.atime, nsec)
# just remember encryption info
def _parse_file_encryption(self, h, xdata, pos):
algo, pos = load_vint(xdata, pos)
flags, pos = load_vint(xdata, pos)
kdf_count, pos = load_byte(xdata, pos)
salt, pos = load_bytes(xdata, 16, pos)
iv, pos = load_bytes(xdata, 16, pos)
checkval = None
if flags & RAR5_XENC_CHECKVAL:
checkval, pos = load_bytes(xdata, 12, pos)
if flags & RAR5_XENC_TWEAKED:
h._md_expect = None
h._md_class = NoHashContext
h.file_encryption = (algo, flags, kdf_count, salt, iv, checkval)
h.flags |= RAR_FILE_PASSWORD
def _parse_file_hash(self, h, xdata, pos):
hash_type, pos = load_vint(xdata, pos)
if hash_type == RAR5_XHASH_BLAKE2SP:
h.blake2sp_hash, pos = load_bytes(xdata, 32, pos)
if (h.file_encryption[1] & RAR5_XENC_TWEAKED) == 0:
h._md_class = Blake2SP
h._md_expect = h.blake2sp_hash
def _parse_file_version(self, h, xdata, pos):
flags, pos = load_vint(xdata, pos)
version, pos = load_vint(xdata, pos)
h.file_version = (flags, version)
def _parse_file_redir(self, h, xdata, pos):
redir_type, pos = load_vint(xdata, pos)
redir_flags, pos = load_vint(xdata, pos)
redir_name, pos = load_vstr(xdata, pos)
redir_name = redir_name.decode("utf8", "replace")
h.file_redir = (redir_type, redir_flags, redir_name)
def _parse_file_owner(self, h, xdata, pos):
user_name = group_name = user_id = group_id = None
flags, pos = load_vint(xdata, pos)
if flags & RAR5_XOWNER_UNAME:
user_name, pos = load_vstr(xdata, pos)
if flags & RAR5_XOWNER_GNAME:
group_name, pos = load_vstr(xdata, pos)
if flags & RAR5_XOWNER_UID:
user_id, pos = load_vint(xdata, pos)
if flags & RAR5_XOWNER_GID:
group_id, pos = load_vint(xdata, pos)
h.file_owner = (user_name, group_name, user_id, group_id)
def process_entry(self, fd, item):
if item.block_type == RAR5_BLOCK_FILE:
if item.file_version:
pass # skip old versions
elif (item.block_flags & RAR5_BLOCK_FLAG_SPLIT_BEFORE) == 0:
# use only first part
self._info_map[item.filename.rstrip("/")] = item
self._info_list.append(item)
elif len(self._info_list) > 0:
# final crc is in last block
old = self._info_list[-1]
old.CRC = item.CRC
old._md_expect = item._md_expect
old.blake2sp_hash = item.blake2sp_hash
old.compress_size += item.compress_size
elif item.block_type == RAR5_BLOCK_SERVICE:
if item.filename == "CMT":
self._load_comment(fd, item)
def _load_comment(self, fd, item):
if item.block_flags & (RAR5_BLOCK_FLAG_SPLIT_BEFORE | RAR5_BLOCK_FLAG_SPLIT_AFTER):
return None
if item.compress_type != RAR_M0:
return None
if item.flags & RAR_FILE_PASSWORD:
algo, ___flags, kdf_count, salt, iv, ___checkval = item.file_encryption
if algo != RAR5_XENC_CIPHER_AES256:
return None
key = self._gen_key(kdf_count, salt)
f = HeaderDecrypt(fd, key, iv)
cmt = f.read(item.file_size)
else:
# archive comment
with self._open_clear(item) as cmtstream:
cmt = cmtstream.read()
# rar bug? - appends zero to comment
cmt = cmt.split(b"\0", 1)[0]
self.comment = cmt.decode("utf8")
return None
def _open_hack(self, inf, pwd):
# len, type, blk_flags, flags
main_hdr = b"\x03\x01\x00\x00"
endarc_hdr = b"\x03\x05\x00\x00"
main_hdr = S_LONG.pack(crc32(main_hdr)) + main_hdr
endarc_hdr = S_LONG.pack(crc32(endarc_hdr)) + endarc_hdr
return self._open_hack_core(inf, pwd, RAR5_ID + main_hdr, endarc_hdr)
##
## Utility classes
##
class UnicodeFilename:
"""Handle RAR3 unicode filename decompression.
"""
def __init__(self, name, encdata):
self.std_name = bytearray(name)
self.encdata = bytearray(encdata)
self.pos = self.encpos = 0
self.buf = bytearray()
self.failed = 0
def enc_byte(self):
"""Copy encoded byte."""
try:
c = self.encdata[self.encpos]
self.encpos += 1
return c
except IndexError:
self.failed = 1
return 0
def std_byte(self):
"""Copy byte from 8-bit representation."""
try:
return self.std_name[self.pos]
except IndexError:
self.failed = 1
return ord("?")
def put(self, lo, hi):
"""Copy 16-bit value to result."""
self.buf.append(lo)
self.buf.append(hi)
self.pos += 1
def decode(self):
"""Decompress compressed UTF16 value."""
hi = self.enc_byte()
flagbits = 0
while self.encpos < len(self.encdata):
if flagbits == 0:
flags = self.enc_byte()
flagbits = 8
flagbits -= 2
t = (flags >> flagbits) & 3
if t == 0:
self.put(self.enc_byte(), 0)
elif t == 1:
self.put(self.enc_byte(), hi)
elif t == 2:
self.put(self.enc_byte(), self.enc_byte())
else:
n = self.enc_byte()
if n & 0x80:
c = self.enc_byte()
for _ in range((n & 0x7f) + 2):
lo = (self.std_byte() + c) & 0xFF
self.put(lo, hi)
else:
for _ in range(n + 2):
self.put(self.std_byte(), 0)
return self.buf.decode("utf-16le", "replace")
class RarExtFile(io.RawIOBase):
"""Base class for file-like object that :meth:`RarFile.open` returns.
Provides public methods and common crc checking.
Behaviour:
- no short reads - .read() and .readinfo() read as much as requested.
- no internal buffer, use io.BufferedReader for that.
"""
name = None #: Filename of the archive entry
mode = "rb"
_parser = None
_inf = None
_fd = None
_remain = 0
_returncode = 0
_md_context = None
_seeking = False
def _open_extfile(self, parser, inf):
self.name = inf.filename
self._parser = parser
self._inf = inf
if self._fd:
self._fd.close()
if self._seeking:
md_class = NoHashContext
else:
md_class = self._inf._md_class or NoHashContext
self._md_context = md_class()
self._fd = None
self._remain = self._inf.file_size
def read(self, n=-1):
"""Read all or specified amount of data from archive entry."""
# sanitize count
if n is None or n < 0:
n = self._remain
elif n > self._remain:
n = self._remain
if n == 0:
return b""
buf = []
orig = n
while n > 0:
# actual read
data = self._read(n)
if not data:
break
buf.append(data)
self._md_context.update(data)
self._remain -= len(data)
n -= len(data)
data = b"".join(buf)
if n > 0:
raise BadRarFile("Failed the read enough data: req=%d got=%d" % (orig, len(data)))
# done?
if not data or self._remain == 0:
# self.close()
self._check()
return data
def _check(self):
"""Check final CRC."""
final = self._md_context.digest()
exp = self._inf._md_expect
if exp is None:
return
if final is None:
return
if self._returncode:
check_returncode(self._returncode, "", tool_setup().get_errmap())
if self._remain != 0:
raise BadRarFile("Failed the read enough data")
if final != exp:
raise BadRarFile("Corrupt file - CRC check failed: %s - exp=%r got=%r" % (
self._inf.filename, exp, final))
def _read(self, cnt):
"""Actual read that gets sanitized cnt."""
raise NotImplementedError("_read")
def close(self):
"""Close open resources."""
super().close()
if self._fd:
self._fd.close()
self._fd = None
def __del__(self):
"""Hook delete to make sure tempfile is removed."""
self.close()
def readinto(self, buf):
"""Zero-copy read directly into buffer.
Returns bytes read.
"""
raise NotImplementedError("readinto")
def tell(self):
"""Return current reading position in uncompressed data."""
return self._inf.file_size - self._remain
def seek(self, offset, whence=0):
"""Seek in data.
On uncompressed files, the seeking works by actual
seeks so it's fast. On compresses files its slow
- forward seeking happends by reading ahead,
backwards by re-opening and decompressing from the start.
"""
# disable crc check when seeking
if not self._seeking:
self._md_context = NoHashContext()
self._seeking = True
fsize = self._inf.file_size
cur_ofs = self.tell()
if whence == 0: # seek from beginning of file
new_ofs = offset
elif whence == 1: # seek from current position
new_ofs = cur_ofs + offset
elif whence == 2: # seek from end of file
new_ofs = fsize + offset
else:
raise ValueError("Invalid value for whence")
# sanity check
if new_ofs < 0:
new_ofs = 0
elif new_ofs > fsize:
new_ofs = fsize
# do the actual seek
if new_ofs >= cur_ofs:
self._skip(new_ofs - cur_ofs)
else:
# reopen and seek
self._open_extfile(self._parser, self._inf)
self._skip(new_ofs)
return self.tell()
def _skip(self, cnt):
"""Read and discard data"""
empty_read(self, cnt, BSIZE)
def readable(self):
"""Returns True"""
return True
def writable(self):
"""Returns False.
Writing is not supported.
"""
return False
def seekable(self):
"""Returns True.
Seeking is supported, although it's slow on compressed files.
"""
return True
def readall(self):
"""Read all remaining data"""
# avoid RawIOBase default impl
return self.read()
class PipeReader(RarExtFile):
"""Read data from pipe, handle tempfile cleanup."""
def __init__(self, parser, inf, cmd, tempfile=None):
super().__init__()
self._cmd = cmd
self._proc = None
self._tempfile = tempfile
self._open_extfile(parser, inf)
def _close_proc(self):
if not self._proc:
return
for f in (self._proc.stdout, self._proc.stderr, self._proc.stdin):
if f:
f.close()
self._proc.wait()
self._returncode = self._proc.returncode
self._proc = None
def _open_extfile(self, parser, inf):
super()._open_extfile(parser, inf)
# stop old process
self._close_proc()
# launch new process
self._returncode = 0
self._proc = custom_popen(self._cmd)
self._fd = self._proc.stdout
def _read(self, cnt):
"""Read from pipe."""
# normal read is usually enough
data = self._fd.read(cnt)
if len(data) == cnt or not data:
return data
# short read, try looping
buf = [data]
cnt -= len(data)
while cnt > 0:
data = self._fd.read(cnt)
if not data:
break
cnt -= len(data)
buf.append(data)
return b"".join(buf)
def close(self):
"""Close open resources."""
self._close_proc()
super().close()
if self._tempfile:
try:
os.unlink(self._tempfile)
except OSError:
pass
self._tempfile = None
def readinto(self, buf):
"""Zero-copy read directly into buffer."""
cnt = len(buf)
if cnt > self._remain:
cnt = self._remain
vbuf = memoryview(buf)
res = got = 0
while got < cnt:
res = self._fd.readinto(vbuf[got: cnt])
if not res:
break
self._md_context.update(vbuf[got: got + res])
self._remain -= res
got += res
return got
class DirectReader(RarExtFile):
"""Read uncompressed data directly from archive.
"""
_cur = None
_cur_avail = None
_volfile = None
def __init__(self, parser, inf):
super().__init__()
self._open_extfile(parser, inf)
def _open_extfile(self, parser, inf):
super()._open_extfile(parser, inf)
self._volfile = self._inf.volume_file
self._fd = XFile(self._volfile, 0)
self._fd.seek(self._inf.header_offset, 0)
self._cur = self._parser._parse_header(self._fd)
self._cur_avail = self._cur.add_size
def _skip(self, cnt):
"""RAR Seek, skipping through rar files to get to correct position
"""
while cnt > 0:
# next vol needed?
if self._cur_avail == 0:
if not self._open_next():
break
# fd is in read pos, do the read
if cnt > self._cur_avail:
cnt -= self._cur_avail
self._remain -= self._cur_avail
self._cur_avail = 0
else:
self._fd.seek(cnt, 1)
self._cur_avail -= cnt
self._remain -= cnt
cnt = 0
def _read(self, cnt):
"""Read from potentially multi-volume archive."""
pos = self._fd.tell()
need = self._cur.data_offset + self._cur.add_size - self._cur_avail
if pos != need:
self._fd.seek(need, 0)
buf = []
while cnt > 0:
# next vol needed?
if self._cur_avail == 0:
if not self._open_next():
break
# fd is in read pos, do the read
if cnt > self._cur_avail:
data = self._fd.read(self._cur_avail)
else:
data = self._fd.read(cnt)
if not data:
break
# got some data
cnt -= len(data)
self._cur_avail -= len(data)
buf.append(data)
if len(buf) == 1:
return buf[0]
return b"".join(buf)
def _open_next(self):
"""Proceed to next volume."""
# is the file split over archives?
if (self._cur.flags & RAR_FILE_SPLIT_AFTER) == 0:
return False
if self._fd:
self._fd.close()
self._fd = None
# open next part
self._volfile = self._parser._next_volname(self._volfile)
fd = open(self._volfile, "rb", 0)
self._fd = fd
sig = fd.read(len(self._parser._expect_sig))
if sig != self._parser._expect_sig:
raise BadRarFile("Invalid signature")
# loop until first file header
while True:
cur = self._parser._parse_header(fd)
if not cur:
raise BadRarFile("Unexpected EOF")
if cur.type in (RAR_BLOCK_MARK, RAR_BLOCK_MAIN):
if cur.add_size:
fd.seek(cur.add_size, 1)
continue
if cur.orig_filename != self._inf.orig_filename:
raise BadRarFile("Did not found file entry")
self._cur = cur
self._cur_avail = cur.add_size
return True
def readinto(self, buf):
"""Zero-copy read directly into buffer."""
got = 0
vbuf = memoryview(buf)
while got < len(buf):
# next vol needed?
if self._cur_avail == 0:
if not self._open_next():
break
# length for next read
cnt = len(buf) - got
if cnt > self._cur_avail:
cnt = self._cur_avail
# read into temp view
res = self._fd.readinto(vbuf[got: got + cnt])
if not res:
break
self._md_context.update(vbuf[got: got + res])
self._cur_avail -= res
self._remain -= res
got += res
return got
class HeaderDecrypt:
"""File-like object that decrypts from another file"""
def __init__(self, f, key, iv):
self.f = f
self.ciph = AES_CBC_Decrypt(key, iv)
self.buf = b""
def tell(self):
"""Current file pos - works only on block boundaries."""
return self.f.tell()
def read(self, cnt=None):
"""Read and decrypt."""
if cnt > 8 * 1024:
raise BadRarFile("Bad count to header decrypt - wrong password?")
# consume old data
if cnt <= len(self.buf):
res = self.buf[:cnt]
self.buf = self.buf[cnt:]
return res
res = self.buf
self.buf = b""
cnt -= len(res)
# decrypt new data
blklen = 16
while cnt > 0:
enc = self.f.read(blklen)
if len(enc) < blklen:
break
dec = self.ciph.decrypt(enc)
if cnt >= len(dec):
res += dec
cnt -= len(dec)
else:
res += dec[:cnt]
self.buf = dec[cnt:]
cnt = 0
return res
class XFile:
"""Input may be filename or file object.
"""
__slots__ = ("_fd", "_need_close")
def __init__(self, xfile, bufsize=1024):
if is_filelike(xfile):
self._need_close = False
self._fd = xfile
self._fd.seek(0)
else:
self._need_close = True
self._fd = open(xfile, "rb", bufsize)
def read(self, n=None):
"""Read from file."""
return self._fd.read(n)
def tell(self):
"""Return file pos."""
return self._fd.tell()
def seek(self, ofs, whence=0):
"""Move file pos."""
return self._fd.seek(ofs, whence)
def readinto(self, buf):
"""Read into buffer."""
return self._fd.readinto(buf)
def close(self):
"""Close file object."""
if self._need_close:
self._fd.close()
def __enter__(self):
return self
def __exit__(self, typ, val, tb):
self.close()
class NoHashContext:
"""No-op hash function."""
def __init__(self, data=None):
"""Initialize"""
def update(self, data):
"""Update data"""
def digest(self):
"""Final hash"""
def hexdigest(self):
"""Hexadecimal digest."""
class CRC32Context:
"""Hash context that uses CRC32."""
__slots__ = ["_crc"]
def __init__(self, data=None):
self._crc = 0
if data:
self.update(data)
def update(self, data):
"""Process data."""
self._crc = crc32(data, self._crc)
def digest(self):
"""Final hash."""
return self._crc
def hexdigest(self):
"""Hexadecimal digest."""
return "%08x" % self.digest()
class Blake2SP:
"""Blake2sp hash context.
"""
__slots__ = ["_thread", "_buf", "_cur", "_digest"]
digest_size = 32
block_size = 64
parallelism = 8
def __init__(self, data=None):
self._buf = b""
self._cur = 0
self._digest = None
self._thread = []
for i in range(self.parallelism):
ctx = self._blake2s(i, 0, i == (self.parallelism - 1))
self._thread.append(ctx)
if data:
self.update(data)
def _blake2s(self, ofs, depth, is_last):
return blake2s(node_offset=ofs, node_depth=depth, last_node=is_last,
depth=2, inner_size=32, fanout=self.parallelism)
def _add_block(self, blk):
self._thread[self._cur].update(blk)
self._cur = (self._cur + 1) % self.parallelism
def update(self, data):
"""Hash data.
"""
view = memoryview(data)
bs = self.block_size
if self._buf:
need = bs - len(self._buf)
if len(view) < need:
self._buf += view.tobytes()
return
self._add_block(self._buf + view[:need].tobytes())
view = view[need:]
while len(view) >= bs:
self._add_block(view[:bs])
view = view[bs:]
self._buf = view.tobytes()
def digest(self):
"""Return final digest value.
"""
if self._digest is None:
if self._buf:
self._add_block(self._buf)
self._buf = b""
ctx = self._blake2s(0, 1, True)
for t in self._thread:
ctx.update(t.digest())
self._digest = ctx.digest()
return self._digest
def hexdigest(self):
"""Hexadecimal digest."""
return hexlify(self.digest()).decode("ascii")
class Rar3Sha1:
"""Emulate buggy SHA1 from RAR3.
"""
digest_size = 20
block_size = 64
_BLK_BE = struct.Struct(b">16L")
_BLK_LE = struct.Struct(b"<16L")
__slots__ = ("_nbytes", "_md", "_rarbug")
def __init__(self, data=b"", rarbug=False):
self._md = sha1()
self._nbytes = 0
self._rarbug = rarbug
self.update(data)
def update(self, data):
"""Process more data."""
self._md.update(data)
bufpos = self._nbytes & 63
self._nbytes += len(data)
if self._rarbug and len(data) > 64:
dpos = self.block_size - bufpos
while dpos + self.block_size <= len(data):
self._corrupt(data, dpos)
dpos += self.block_size
def digest(self):
"""Return final state."""
return self._md.digest()
def hexdigest(self):
"""Return final state as hex string."""
return self._md.hexdigest()
def _corrupt(self, data, dpos):
"""Corruption from SHA1 core."""
ws = list(self._BLK_BE.unpack_from(data, dpos))
for t in range(16, 80):
tmp = ws[(t - 3) & 15] ^ ws[(t - 8) & 15] ^ ws[(t - 14) & 15] ^ ws[(t - 16) & 15]
ws[t & 15] = ((tmp << 1) | (tmp >> (32 - 1))) & 0xFFFFFFFF
self._BLK_LE.pack_into(data, dpos, *ws)
##
## Utility functions
##
S_LONG = Struct("<L")
S_SHORT = Struct("<H")
S_BYTE = Struct("<B")
S_BLK_HDR = Struct("<HBHH")
S_FILE_HDR = Struct("<LLBLLBBHL")
S_COMMENT_HDR = Struct("<HBBH")
def load_vint(buf, pos):
"""Load RAR5 variable-size int."""
limit = min(pos + 11, len(buf))
res = ofs = 0
while pos < limit:
b = buf[pos]
res += ((b & 0x7F) << ofs)
pos += 1
ofs += 7
if b < 0x80:
return res, pos
raise BadRarFile("cannot load vint")
def load_byte(buf, pos):
"""Load single byte"""
end = pos + 1
if end > len(buf):
raise BadRarFile("cannot load byte")
return S_BYTE.unpack_from(buf, pos)[0], end
def load_le32(buf, pos):
"""Load little-endian 32-bit integer"""
end = pos + 4
if end > len(buf):
raise BadRarFile("cannot load le32")
return S_LONG.unpack_from(buf, pos)[0], end
def load_bytes(buf, num, pos):
"""Load sequence of bytes"""
end = pos + num
if end > len(buf):
raise BadRarFile("cannot load bytes")
return buf[pos: end], end
def load_vstr(buf, pos):
"""Load bytes prefixed by vint length"""
slen, pos = load_vint(buf, pos)
return load_bytes(buf, slen, pos)
def load_dostime(buf, pos):
"""Load LE32 dos timestamp"""
stamp, pos = load_le32(buf, pos)
tup = parse_dos_time(stamp)
return to_datetime(tup), pos
def load_unixtime(buf, pos):
"""Load LE32 unix timestamp"""
secs, pos = load_le32(buf, pos)
dt = datetime.fromtimestamp(secs, timezone.utc)
return dt, pos
def load_windowstime(buf, pos):
"""Load LE64 windows timestamp"""
# unix epoch (1970) in seconds from windows epoch (1601)
unix_epoch = 11644473600
val1, pos = load_le32(buf, pos)
val2, pos = load_le32(buf, pos)
secs, n1secs = divmod((val2 << 32) | val1, 10000000)
dt = datetime.fromtimestamp(secs - unix_epoch, timezone.utc)
dt = to_nsdatetime(dt, n1secs * 100)
return dt, pos
#
# volume numbering
#
_rc_num = re.compile('^[0-9]+$')
def _next_newvol(volfile):
"""New-style next volume
"""
name, ext = os.path.splitext(volfile)
if ext.lower() in ("", ".exe", ".sfx"):
volfile = name + ".rar"
i = len(volfile) - 1
while i >= 0:
if "0" <= volfile[i] <= "9":
return _inc_volname(volfile, i, False)
if volfile[i] in ("/", os.sep):
break
i -= 1
raise BadRarName("Cannot construct volume name: " + volfile)
def _next_oldvol(volfile):
"""Old-style next volume
"""
name, ext = os.path.splitext(volfile)
if ext.lower() in ("", ".exe", ".sfx"):
ext = ".rar"
sfx = ext[2:]
if _rc_num.match(sfx):
ext = _inc_volname(ext, len(ext) - 1, True)
else:
# .rar -> .r00
ext = ext[:2] + "00"
return name + ext
def _inc_volname(volfile, i, inc_chars):
"""increase digits with carry, otherwise just increment char
"""
fn = list(volfile)
while i >= 0:
if fn[i] == "9":
fn[i] = "0"
i -= 1
if i < 0:
fn.insert(0, "1")
elif "0" <= fn[i] < "9" or inc_chars:
fn[i] = chr(ord(fn[i]) + 1)
break
else:
fn.insert(i + 1, "1")
break
return "".join(fn)
def _parse_ext_time(h, data, pos):
"""Parse all RAR3 extended time fields
"""
# flags and rest of data can be missing
flags = 0
if pos + 2 <= len(data):
flags = S_SHORT.unpack_from(data, pos)[0]
pos += 2
mtime, pos = _parse_xtime(flags >> 3 * 4, data, pos, h.mtime)
h.ctime, pos = _parse_xtime(flags >> 2 * 4, data, pos)
h.atime, pos = _parse_xtime(flags >> 1 * 4, data, pos)
h.arctime, pos = _parse_xtime(flags >> 0 * 4, data, pos)
if mtime:
h.mtime = mtime
h.date_time = mtime.timetuple()[:6]
return pos
def _parse_xtime(flag, data, pos, basetime=None):
"""Parse one RAR3 extended time field
"""
res = None
if flag & 8:
if not basetime:
basetime, pos = load_dostime(data, pos)
# load second fractions of 100ns units
rem = 0
cnt = flag & 3
for _ in range(cnt):
b, pos = load_byte(data, pos)
rem = (b << 16) | (rem >> 8)
# dostime has room for 30 seconds only, correct if needed
if flag & 4 and basetime.second < 59:
basetime = basetime.replace(second=basetime.second + 1)
res = to_nsdatetime(basetime, rem * 100)
return res, pos
def is_filelike(obj):
"""Filename or file object?
"""
if isinstance(obj, (bytes, str, Path)):
return False
res = True
for a in ("read", "tell", "seek"):
res = res and hasattr(obj, a)
if not res:
raise ValueError("Invalid object passed as file")
return True
def rar3_s2k(pwd, salt):
"""String-to-key hash for RAR3.
"""
if not isinstance(pwd, str):
pwd = pwd.decode("utf8")
seed = bytearray(pwd.encode("utf-16le") + salt)
h = Rar3Sha1(rarbug=True)
iv = b""
for i in range(16):
for j in range(0x4000):
cnt = S_LONG.pack(i * 0x4000 + j)
h.update(seed)
h.update(cnt[:3])
if j == 0:
iv += h.digest()[19:20]
key_be = h.digest()[:16]
key_le = pack("<LLLL", *unpack(">LLLL", key_be))
return key_le, iv
def rar3_decompress(vers, meth, data, declen=0, flags=0, crc=0, pwd=None, salt=None):
"""Decompress blob of compressed data.
Used for data with non-standard header - eg. comments.
"""
# already uncompressed?
if meth == RAR_M0 and (flags & RAR_FILE_PASSWORD) == 0:
return data
# take only necessary flags
flags = flags & (RAR_FILE_PASSWORD | RAR_FILE_SALT | RAR_FILE_DICTMASK)
flags |= RAR_LONG_BLOCK
# file header
fname = b"data"
date = ((2010 - 1980) << 25) + (12 << 21) + (31 << 16)
mode = DOS_MODE_ARCHIVE
fhdr = S_FILE_HDR.pack(len(data), declen, RAR_OS_MSDOS, crc,
date, vers, meth, len(fname), mode)
fhdr += fname
if salt:
fhdr += salt
# full header
hlen = S_BLK_HDR.size + len(fhdr)
hdr = S_BLK_HDR.pack(0, RAR_BLOCK_FILE, flags, hlen) + fhdr
hcrc = crc32(hdr[2:]) & 0xFFFF
hdr = S_BLK_HDR.pack(hcrc, RAR_BLOCK_FILE, flags, hlen) + fhdr
# archive main header
mh = S_BLK_HDR.pack(0x90CF, RAR_BLOCK_MAIN, 0, 13) + b"\0" * (2 + 4)
# decompress via temp rar
setup = tool_setup()
tmpfd, tmpname = mkstemp(suffix=".rar", dir=HACK_TMP_DIR)
tmpf = os.fdopen(tmpfd, "wb")
try:
tmpf.write(RAR_ID + mh + hdr + data)
tmpf.close()
curpwd = (flags & RAR_FILE_PASSWORD) and pwd or None
cmd = setup.open_cmdline(curpwd, tmpname)
p = custom_popen(cmd)
return p.communicate()[0]
finally:
tmpf.close()
os.unlink(tmpname)
def sanitize_filename(fname, pathsep, is_win32):
"""Simulate unrar sanitization.
"""
if is_win32:
if len(fname) > 1 and fname[1] == ":":
fname = fname[2:]
rc = RC_BAD_CHARS_WIN32
else:
rc = RC_BAD_CHARS_UNIX
if rc.search(fname):
fname = rc.sub("_", fname)
parts = []
for seg in fname.split("/"):
if seg in ("", ".", ".."):
continue
if is_win32 and seg[-1] in (" ", "."):
seg = seg[:-1] + "_"
parts.append(seg)
return pathsep.join(parts)
def empty_read(src, size, blklen):
"""Read and drop fixed amount of data.
"""
while size > 0:
if size > blklen:
res = src.read(blklen)
else:
res = src.read(size)
if not res:
raise BadRarFile("cannot load data")
size -= len(res)
def to_datetime(t):
"""Convert 6-part time tuple into datetime object.
"""
# extract values
year, mon, day, h, m, s = t
# assume the values are valid
try:
return datetime(year, mon, day, h, m, s)
except ValueError:
pass
# sanitize invalid values
mday = (0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)
mon = max(1, min(mon, 12))
day = max(1, min(day, mday[mon]))
h = min(h, 23)
m = min(m, 59)
s = min(s, 59)
return datetime(year, mon, day, h, m, s)
def parse_dos_time(stamp):
"""Parse standard 32-bit DOS timestamp.
"""
sec, stamp = stamp & 0x1F, stamp >> 5
mn, stamp = stamp & 0x3F, stamp >> 6
hr, stamp = stamp & 0x1F, stamp >> 5
day, stamp = stamp & 0x1F, stamp >> 5
mon, stamp = stamp & 0x0F, stamp >> 4
yr = (stamp & 0x7F) + 1980
return (yr, mon, day, hr, mn, sec * 2)
# pylint: disable=arguments-differ,signature-differs
class nsdatetime(datetime):
"""Datetime that carries nanoseconds.
Arithmetic not supported, will lose nanoseconds.
.. versionadded:: 4.0
"""
__slots__ = ("nanosecond",)
nanosecond: int #: Number of nanoseconds, 0 <= nanosecond < 999999999
def __new__(cls, year, month=None, day=None, hour=0, minute=0, second=0,
microsecond=0, tzinfo=None, *, fold=0, nanosecond=0):
usec, mod = divmod(nanosecond, 1000) if nanosecond else (microsecond, 0)
if mod == 0:
return datetime(year, month, day, hour, minute, second, usec, tzinfo, fold=fold)
self = super().__new__(cls, year, month, day, hour, minute, second, usec, tzinfo, fold=fold)
self.nanosecond = nanosecond
return self
def isoformat(self, sep="T", timespec="auto"):
"""Formats with nanosecond precision by default.
"""
if timespec == "auto":
pre, post = super().isoformat(sep, "microseconds").split(".", 1)
return f"{pre}.{self.nanosecond:09d}{post[6:]}"
return super().isoformat(sep, timespec)
def astimezone(self, tz=None):
"""Convert to new timezone.
"""
tmp = super().astimezone(tz)
return self.__class__(tmp.year, tmp.month, tmp.day, tmp.hour, tmp.minute, tmp.second,
nanosecond=self.nanosecond, tzinfo=tmp.tzinfo, fold=tmp.fold)
def replace(self, year=None, month=None, day=None, hour=None, minute=None, second=None,
microsecond=None, tzinfo=None, *, fold=None, nanosecond=None):
"""Return new timestamp with specified fields replaced.
"""
return self.__class__(
self.year if year is None else year,
self.month if month is None else month,
self.day if day is None else day,
self.hour if hour is None else hour,
self.minute if minute is None else minute,
self.second if second is None else second,
nanosecond=((self.nanosecond if microsecond is None else microsecond * 1000)
if nanosecond is None else nanosecond),
tzinfo=self.tzinfo if tzinfo is None else tzinfo,
fold=self.fold if fold is None else fold)
def __hash__(self):
return hash((super().__hash__(), self.nanosecond)) if self.nanosecond else super().__hash__()
def __eq__(self, other):
return super().__eq__(other) and self.nanosecond == (
other.nanosecond if isinstance(other, nsdatetime) else other.microsecond * 1000)
def __gt__(self, other):
return super().__gt__(other) or (super().__eq__(other) and self.nanosecond > (
other.nanosecond if isinstance(other, nsdatetime) else other.microsecond * 1000))
def __lt__(self, other):
return not (self > other or self == other)
def __ge__(self, other):
return not self < other
def __le__(self, other):
return not self > other
def __ne__(self, other):
return not self == other
def to_nsdatetime(dt, nsec):
"""Apply nanoseconds to datetime.
"""
if not nsec:
return dt
return nsdatetime(dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second,
tzinfo=dt.tzinfo, fold=dt.fold, nanosecond=nsec)
def to_nsecs(dt):
"""Convert datatime instance to nanoseconds.
"""
secs = int(dt.timestamp())
nsecs = dt.nanosecond if isinstance(dt, nsdatetime) else dt.microsecond * 1000
return secs * 1000000000 + nsecs
def custom_popen(cmd):
"""Disconnect cmd from parent fds, read only from stdout.
"""
creationflags = 0x08000000 if WIN32 else 0 # CREATE_NO_WINDOW
try:
p = Popen(cmd, bufsize=0, stdout=PIPE, stderr=STDOUT, stdin=DEVNULL,
creationflags=creationflags)
except OSError as ex:
if ex.errno == errno.ENOENT:
raise RarCannotExec("Unrar not installed?") from None
if ex.errno == errno.EACCES or ex.errno == errno.EPERM:
raise RarCannotExec("Cannot execute unrar") from None
raise
return p
def check_returncode(code, out, errmap):
"""Raise exception according to unrar exit code.
"""
if code == 0:
return
if code > 0 and code < len(errmap):
exc = errmap[code]
elif code == 255:
exc = RarUserBreak
elif code < 0:
exc = RarSignalExit
else:
exc = RarUnknownError
# format message
if out:
msg = "%s [%d]: %s" % (exc.__doc__, code, out)
else:
msg = "%s [%d]" % (exc.__doc__, code)
raise exc(msg)
def membuf_tempfile(memfile):
"""Write in-memory file object to real file.
"""
memfile.seek(0, 0)
tmpfd, tmpname = mkstemp(suffix=".rar", dir=HACK_TMP_DIR)
tmpf = os.fdopen(tmpfd, "wb")
try:
shutil.copyfileobj(memfile, tmpf, BSIZE)
tmpf.close()
except BaseException:
tmpf.close()
os.unlink(tmpname)
raise
return tmpname
#
# Find working command-line tool
#
class ToolSetup:
def __init__(self, setup):
self.setup = setup
def check(self):
cmdline = self.get_cmdline("check_cmd", None)
try:
p = custom_popen(cmdline)
out, _ = p.communicate()
return p.returncode == 0
except RarCannotExec:
return False
def open_cmdline(self, pwd, rarfn, filefn=None):
cmdline = self.get_cmdline("open_cmd", pwd)
cmdline.append(rarfn)
if filefn:
self.add_file_arg(cmdline, filefn)
return cmdline
def get_errmap(self):
return self.setup["errmap"]
def get_cmdline(self, key, pwd, nodash=False):
cmdline = list(self.setup[key])
cmdline[0] = globals()[cmdline[0]]
if key == "check_cmd":
return cmdline
self.add_password_arg(cmdline, pwd)
if not nodash:
cmdline.append("--")
return cmdline
def add_file_arg(self, cmdline, filename):
cmdline.append(filename)
def add_password_arg(self, cmdline, pwd):
"""Append password switch to commandline.
"""
if pwd is not None:
if not isinstance(pwd, str):
pwd = pwd.decode("utf8")
args = self.setup["password"]
if args is None:
tool = self.setup["open_cmd"][0]
raise RarCannotExec(f"{tool} does not support passwords")
elif isinstance(args, str):
cmdline.append(args + pwd)
else:
cmdline.extend(args)
cmdline.append(pwd)
else:
cmdline.extend(self.setup["no_password"])
UNRAR_CONFIG = {
"open_cmd": ("UNRAR_TOOL", "p", "-inul"),
"check_cmd": ("UNRAR_TOOL", "-inul"),
"password": "-p",
"no_password": ("-p-",),
# map return code to exception class, codes from rar.txt
"errmap": [None,
RarWarning, RarFatalError, RarCRCError, RarLockedArchiveError, # 1..4
RarWriteError, RarOpenError, RarUserError, RarMemoryError, # 5..8
RarCreateError, RarNoFilesError, RarWrongPassword] # 9..11
}
# Problems with unar RAR backend:
# - Does not support RAR2 locked files [fails to read]
# - Does not support RAR5 Blake2sp hash [reading works]
UNAR_CONFIG = {
"open_cmd": ("UNAR_TOOL", "-q", "-o", "-"),
"check_cmd": ("UNAR_TOOL", "-version"),
"password": ("-p",),
"no_password": ("-p", ""),
"errmap": [None],
}
# Problems with libarchive RAR backend:
# - Does not support solid archives.
# - Does not support password-protected archives.
# - Does not support RARVM-based compression filters.
BSDTAR_CONFIG = {
"open_cmd": ("BSDTAR_TOOL", "-x", "--to-stdout", "-f"),
"check_cmd": ("BSDTAR_TOOL", "--version"),
"password": None,
"no_password": (),
"errmap": [None],
}
SEVENZIP_CONFIG = {
"open_cmd": ("SEVENZIP_TOOL", "e", "-so", "-bb0"),
"check_cmd": ("SEVENZIP_TOOL", "i"),
"password": "-p",
"no_password": ("-p",),
"errmap": [None,
RarWarning, RarFatalError, None, None, # 1..4
None, None, RarUserError, RarMemoryError] # 5..8
}
SEVENZIP2_CONFIG = {
"open_cmd": ("SEVENZIP2_TOOL", "e", "-so", "-bb0"),
"check_cmd": ("SEVENZIP2_TOOL", "i"),
"password": "-p",
"no_password": ("-p",),
"errmap": [None,
RarWarning, RarFatalError, None, None, # 1..4
None, None, RarUserError, RarMemoryError] # 5..8
}
CURRENT_SETUP = None
def tool_setup(unrar=True, unar=True, bsdtar=True, sevenzip=True, sevenzip2=True, force=False):
"""Pick a tool, return cached ToolSetup.
"""
global CURRENT_SETUP
if force:
CURRENT_SETUP = None
if CURRENT_SETUP is not None:
return CURRENT_SETUP
lst = []
if unrar:
lst.append(UNRAR_CONFIG)
if unar:
lst.append(UNAR_CONFIG)
if sevenzip:
lst.append(SEVENZIP_CONFIG)
if sevenzip2:
lst.append(SEVENZIP2_CONFIG)
if bsdtar:
lst.append(BSDTAR_CONFIG)
for conf in lst:
setup = ToolSetup(conf)
if setup.check():
CURRENT_SETUP = setup
break
if CURRENT_SETUP is None:
raise RarCannotExec("Cannot find working tool")
return CURRENT_SETUP
def main(args):
"""Minimal command-line interface for rarfile module.
"""
import argparse
p = argparse.ArgumentParser(description=main.__doc__)
g = p.add_mutually_exclusive_group(required=True)
g.add_argument("-l", "--list", metavar="<rarfile>",
help="Show archive listing")
g.add_argument("-e", "--extract", nargs=2,
metavar=("<rarfile>", "<output_dir>"),
help="Extract archive into target dir")
g.add_argument("-t", "--test", metavar="<rarfile>",
help="Test if a archive is valid")
cmd = p.parse_args(args)
if cmd.list:
with RarFile(cmd.list) as rf:
rf.printdir()
elif cmd.test:
with RarFile(cmd.test) as rf:
rf.testrar()
elif cmd.extract:
with RarFile(cmd.extract[0]) as rf:
rf.extractall(cmd.extract[1])
if __name__ == "__main__":
main(sys.argv[1:])
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