mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-28 21:53:38 +00:00
225 lines
8.6 KiB
Python
225 lines
8.6 KiB
Python
"""
|
|
Microsoft Windows Portable Executable (PE) file parser.
|
|
|
|
Informations:
|
|
- Microsoft Portable Executable and Common Object File Format Specification:
|
|
http://www.microsoft.com/whdc/system/platform/firmware/PECOFF.mspx
|
|
|
|
Author: Victor Stinner
|
|
Creation date: 2006-08-13
|
|
"""
|
|
|
|
from hachoir.parser import HachoirParser
|
|
from hachoir.core.endian import LITTLE_ENDIAN
|
|
from hachoir.field import (FieldSet, RootSeekableFieldSet,
|
|
UInt16, UInt32, String,
|
|
RawBytes, PaddingBytes)
|
|
from hachoir.core.text_handler import textHandler, hexadecimal
|
|
from hachoir.parser.program.exe_ne import NE_Header
|
|
from hachoir.parser.program.exe_pe import PE_Header, PE_OptHeader, SectionHeader
|
|
from hachoir.parser.program.exe_res import PE_Resource, NE_VersionInfoNode
|
|
|
|
MAX_NB_SECTION = 50
|
|
|
|
|
|
class MSDosHeader(FieldSet):
|
|
static_size = 64 * 8
|
|
|
|
def createFields(self):
|
|
yield String(self, "header", 2, "File header (MZ)", charset="ASCII")
|
|
yield UInt16(self, "size_mod_512", "File size in bytes modulo 512")
|
|
yield UInt16(self, "size_div_512", "File size in bytes divide by 512")
|
|
yield UInt16(self, "reloc_entries", "Number of relocation entries")
|
|
yield UInt16(self, "code_offset", "Offset to the code in the file (divided by 16)")
|
|
yield UInt16(self, "needed_memory", "Memory needed to run (divided by 16)")
|
|
yield UInt16(self, "max_memory", "Maximum memory needed to run (divided by 16)")
|
|
yield textHandler(UInt32(self, "init_ss_sp", "Initial value of SP:SS registers"), hexadecimal)
|
|
yield UInt16(self, "checksum", "Checksum")
|
|
yield textHandler(UInt32(self, "init_cs_ip", "Initial value of CS:IP registers"), hexadecimal)
|
|
yield UInt16(self, "reloc_offset", "Offset in file to relocation table")
|
|
yield UInt16(self, "overlay_number", "Overlay number")
|
|
yield PaddingBytes(self, "reserved[]", 8, "Reserved")
|
|
yield UInt16(self, "oem_id", "OEM id")
|
|
yield UInt16(self, "oem_info", "OEM info")
|
|
yield PaddingBytes(self, "reserved[]", 20, "Reserved")
|
|
yield UInt32(self, "next_offset", "Offset to next header (PE or NE)")
|
|
|
|
def isValid(self):
|
|
if 512 <= self["size_mod_512"].value:
|
|
return "Invalid field 'size_mod_512' value"
|
|
if self["code_offset"].value < 4:
|
|
return "Invalid code offset"
|
|
looks_pe = self["size_div_512"].value < 4
|
|
if looks_pe:
|
|
if self["checksum"].value != 0:
|
|
return "Invalid value of checksum"
|
|
if not (80 <= self["next_offset"].value <= 1024):
|
|
return "Invalid value of next_offset"
|
|
return ""
|
|
|
|
|
|
class ExeFile(HachoirParser, RootSeekableFieldSet):
|
|
PARSER_TAGS = {
|
|
"id": "exe",
|
|
"category": "program",
|
|
"file_ext": ("exe", "dll", "ocx", "pyd", "scr"),
|
|
"mime": ("application/x-dosexec",),
|
|
"min_size": 64 * 8,
|
|
# "magic": ((b"MZ", 0),),
|
|
"magic_regex": ((b"MZ.[\0\1].{4}[^\0\1\2\3]", 0),),
|
|
"description": "Microsoft Windows Portable Executable"
|
|
}
|
|
endian = LITTLE_ENDIAN
|
|
|
|
def __init__(self, stream, **args):
|
|
RootSeekableFieldSet.__init__(
|
|
self, None, "root", stream, None, stream.askSize(self))
|
|
HachoirParser.__init__(self, stream, **args)
|
|
|
|
def validate(self):
|
|
if self.stream.readBytes(0, 2) != b'MZ':
|
|
return "Wrong header"
|
|
err = self["msdos"].isValid()
|
|
if err:
|
|
return "Invalid MSDOS header: " + err
|
|
if self.isPE():
|
|
if MAX_NB_SECTION < self["pe_header/nb_section"].value:
|
|
return "Invalid number of section (%s)" \
|
|
% self["pe_header/nb_section"].value
|
|
return True
|
|
|
|
def createFields(self):
|
|
yield MSDosHeader(self, "msdos", "MS-DOS program header")
|
|
|
|
if self.isPE() or self.isNE():
|
|
offset = self["msdos/next_offset"].value
|
|
self.seekByte(offset, relative=False)
|
|
|
|
if self.isPE():
|
|
yield from self.parsePortableExecutable()
|
|
elif self.isNE():
|
|
yield from self.parseNE_Executable()
|
|
else:
|
|
offset = self["msdos/code_offset"].value * 16
|
|
self.seekByte(offset, relative=False)
|
|
|
|
def parseNE_Executable(self):
|
|
yield NE_Header(self, "ne_header")
|
|
|
|
# FIXME: Compute resource offset instead of using searchBytes()
|
|
# Ugly hack to get find version info structure
|
|
start = self.current_size
|
|
addr = self.stream.searchBytes(b'VS_VERSION_INFO', start)
|
|
if addr:
|
|
self.seekBit(addr - 32)
|
|
yield NE_VersionInfoNode(self, "info")
|
|
|
|
def parsePortableExecutable(self):
|
|
# Read PE header
|
|
yield PE_Header(self, "pe_header")
|
|
|
|
# Read PE optional header
|
|
size = self["pe_header/opt_hdr_size"].value
|
|
rsrc_rva = None
|
|
if size:
|
|
yield PE_OptHeader(self, "pe_opt_header", size=size * 8)
|
|
if "pe_opt_header/resource/rva" in self:
|
|
rsrc_rva = self["pe_opt_header/resource/rva"].value
|
|
|
|
# Read section headers
|
|
sections = []
|
|
for index in range(self["pe_header/nb_section"].value):
|
|
section = SectionHeader(self, "section_hdr[]")
|
|
yield section
|
|
if section["phys_size"].value:
|
|
sections.append(section)
|
|
|
|
# Read sections
|
|
sections.sort(key=lambda field: field["phys_off"].value)
|
|
for section in sections:
|
|
self.seekByte(section["phys_off"].value)
|
|
size = section["phys_size"].value
|
|
if size:
|
|
name = section.createSectionName()
|
|
if rsrc_rva is not None and section["rva"].value == rsrc_rva:
|
|
yield PE_Resource(self, name, section, size=size * 8)
|
|
else:
|
|
yield RawBytes(self, name, size)
|
|
|
|
def isPE(self):
|
|
if not hasattr(self, "_is_pe"):
|
|
self._is_pe = False
|
|
offset = self["msdos/next_offset"].value * 8
|
|
if 2 * 8 <= offset \
|
|
and (offset + PE_Header.static_size) <= self.size \
|
|
and self.stream.readBytes(offset, 4) == b'PE\0\0':
|
|
self._is_pe = True
|
|
return self._is_pe
|
|
|
|
def isNE(self):
|
|
if not hasattr(self, "_is_ne"):
|
|
self._is_ne = False
|
|
offset = self["msdos/next_offset"].value * 8
|
|
if 64 * 8 <= offset \
|
|
and (offset + NE_Header.static_size) <= self.size \
|
|
and self.stream.readBytes(offset, 2) == b'NE':
|
|
self._is_ne = True
|
|
return self._is_ne
|
|
|
|
def getResource(self):
|
|
# MS-DOS program: no resource
|
|
if not self.isPE():
|
|
return None
|
|
|
|
# Check if PE has resource or not
|
|
if "pe_opt_header/resource/size" in self:
|
|
if not self["pe_opt_header/resource/size"].value:
|
|
return None
|
|
if "section_rsrc" in self:
|
|
return self["section_rsrc"]
|
|
return None
|
|
|
|
def createDescription(self):
|
|
if self.isPE():
|
|
if self["pe_header/is_dll"].value:
|
|
text = "Microsoft Windows DLL"
|
|
else:
|
|
text = "Microsoft Windows Portable Executable"
|
|
info = [self["pe_header/cpu"].display]
|
|
if "pe_opt_header" in self:
|
|
hdr = self["pe_opt_header"]
|
|
info.append(hdr["subsystem"].display)
|
|
if self["pe_header/is_stripped"].value:
|
|
info.append("stripped")
|
|
return "%s: %s" % (text, ", ".join(info))
|
|
elif self.isNE():
|
|
return "New-style Executable (NE) for Microsoft MS Windows 3.x"
|
|
else:
|
|
return "MS-DOS executable"
|
|
|
|
def createContentSize(self):
|
|
if self.isPE():
|
|
size = 0
|
|
for index in range(self["pe_header/nb_section"].value):
|
|
section = self["section_hdr[%u]" % index]
|
|
section_size = section["phys_size"].value
|
|
if not section_size:
|
|
continue
|
|
section_size = (section_size + section["phys_off"].value) * 8
|
|
if size:
|
|
size = max(size, section_size)
|
|
else:
|
|
size = section_size
|
|
if size:
|
|
return size
|
|
else:
|
|
return None
|
|
elif self.isNE():
|
|
# TODO: Guess NE size
|
|
return None
|
|
else:
|
|
size = self["msdos/size_mod_512"].value + \
|
|
(self["msdos/size_div_512"].value - 1) * 512
|
|
if size < 0:
|
|
return None
|
|
return size * 8
|