mirror of
https://github.com/SickGear/SickGear.git
synced 2024-12-18 16:53:38 +00:00
366 lines
14 KiB
Python
366 lines
14 KiB
Python
"""
|
|
ELF (Unix/BSD executable file format) parser.
|
|
|
|
Author: Victor Stinner, Robert Xiao
|
|
Creation date: 08 may 2006
|
|
Reference:
|
|
- System V Application Binary Interface - DRAFT - 10 June 2013
|
|
http://www.sco.com/developers/gabi/latest/contents.html
|
|
"""
|
|
|
|
from hachoir.parser import HachoirParser
|
|
from hachoir.field import (RootSeekableFieldSet, FieldSet, Bit, NullBits, RawBits,
|
|
UInt8, UInt16, UInt32, UInt64, Enum,
|
|
String, RawBytes, Bytes)
|
|
from hachoir.core.text_handler import textHandler, hexadecimal
|
|
from hachoir.core.endian import LITTLE_ENDIAN, BIG_ENDIAN
|
|
|
|
|
|
class ElfHeader(FieldSet):
|
|
MAGIC = b"\x7FELF"
|
|
LITTLE_ENDIAN_ID = 1
|
|
BIG_ENDIAN_ID = 2
|
|
MACHINE_NAME = {
|
|
# e_machine, EM_ defines
|
|
0: "No machine",
|
|
1: "AT&T WE 32100",
|
|
2: "SPARC",
|
|
3: "Intel 80386",
|
|
4: "Motorola 68000",
|
|
5: "Motorola 88000",
|
|
6: "Intel 80486",
|
|
7: "Intel 80860",
|
|
8: "MIPS I Architecture",
|
|
9: "Amdahl UTS on System/370",
|
|
10: "MIPS RS3000 Little-endian",
|
|
11: "IBM RS/6000 XXX reserved",
|
|
15: "Hewlett-Packard PA-RISC",
|
|
16: "NCube XXX reserved",
|
|
17: "Fujitsu VPP500",
|
|
18: "Enhanced instruction set SPARC",
|
|
19: "Intel 80960",
|
|
20: "PowerPC 32-bit",
|
|
21: "PowerPC 64-bit",
|
|
22: "IBM S390",
|
|
36: "NEC V800",
|
|
37: "Fujitsu FR20",
|
|
38: "TRW RH-32",
|
|
39: "Motorola RCE",
|
|
40: "Advanced RISC Machines (ARM)",
|
|
41: "DIGITAL Alpha",
|
|
42: "Hitachi Super-H",
|
|
43: "SPARC Version 9",
|
|
44: "Siemens Tricore",
|
|
45: "Argonaut RISC Core",
|
|
46: "Hitachi H8/300",
|
|
47: "Hitachi H8/300H",
|
|
48: "Hitachi H8S",
|
|
49: "Hitachi H8/500",
|
|
50: "Intel Merced (IA-64) Processor",
|
|
51: "Stanford MIPS-X",
|
|
52: "Motorola Coldfire",
|
|
53: "Motorola MC68HC12",
|
|
62: "Advanced Micro Devices x86-64",
|
|
75: "DIGITAL VAX",
|
|
36902: "used by NetBSD/alpha; obsolete",
|
|
}
|
|
CLASS_NAME = {
|
|
# e_ident[EI_CLASS], ELFCLASS defines
|
|
1: "32 bits",
|
|
2: "64 bits"
|
|
}
|
|
TYPE_NAME = {
|
|
# e_type, ET_ defines
|
|
0: "No file type",
|
|
1: "Relocatable file",
|
|
2: "Executable file",
|
|
3: "Shared object file",
|
|
4: "Core file",
|
|
0xFF00: "Processor-specific (0xFF00)",
|
|
0xFFFF: "Processor-specific (0xFFFF)",
|
|
}
|
|
OSABI_NAME = {
|
|
# e_ident[EI_OSABI], ELFOSABI_ defines
|
|
0: "UNIX System V ABI",
|
|
1: "HP-UX operating system",
|
|
2: "NetBSD",
|
|
3: "GNU/Linux",
|
|
4: "GNU/Hurd",
|
|
5: "86Open common IA32 ABI",
|
|
6: "Solaris",
|
|
7: "Monterey",
|
|
8: "IRIX",
|
|
9: "FreeBSD",
|
|
10: "TRU64 UNIX",
|
|
11: "Novell Modesto",
|
|
12: "OpenBSD",
|
|
97: "ARM",
|
|
255: "Standalone (embedded) application",
|
|
}
|
|
ENDIAN_NAME = {
|
|
# e_ident[EI_DATA], ELFDATA defines
|
|
LITTLE_ENDIAN_ID: "Little endian",
|
|
BIG_ENDIAN_ID: "Big endian",
|
|
}
|
|
|
|
def createFields(self):
|
|
yield Bytes(self, "signature", 4, r'ELF signature ("\x7fELF")')
|
|
yield Enum(UInt8(self, "class", "Class"), self.CLASS_NAME)
|
|
if self["class"].value == 1:
|
|
ElfLongWord = UInt32
|
|
else:
|
|
ElfLongWord = UInt64
|
|
yield Enum(UInt8(self, "endian", "Endian"), self.ENDIAN_NAME)
|
|
yield UInt8(self, "file_version", "File version")
|
|
yield Enum(UInt8(self, "osabi_ident", "OS/syscall ABI identification"), self.OSABI_NAME)
|
|
yield UInt8(self, "abi_version", "syscall ABI version")
|
|
yield String(self, "pad", 7, "Pad")
|
|
|
|
yield Enum(UInt16(self, "type", "File type"), self.TYPE_NAME)
|
|
yield Enum(UInt16(self, "machine", "Machine type"), self.MACHINE_NAME)
|
|
yield UInt32(self, "version", "ELF format version")
|
|
yield textHandler(ElfLongWord(self, "entry", "Entry point"), hexadecimal)
|
|
yield ElfLongWord(self, "phoff", "Program header file offset")
|
|
yield ElfLongWord(self, "shoff", "Section header file offset")
|
|
yield UInt32(self, "flags", "Architecture-specific flags")
|
|
yield UInt16(self, "ehsize", "Elf header size (this header)")
|
|
yield UInt16(self, "phentsize", "Program header entry size")
|
|
yield UInt16(self, "phnum", "Program header entry count")
|
|
yield UInt16(self, "shentsize", "Section header entry size")
|
|
yield UInt16(self, "shnum", "Section header entry count")
|
|
yield UInt16(self, "shstrndx", "Section header string table index")
|
|
|
|
def isValid(self):
|
|
if self["signature"].value != self.MAGIC:
|
|
return "Wrong ELF signature"
|
|
if self["class"].value not in self.CLASS_NAME:
|
|
return "Unknown class"
|
|
if self["endian"].value not in self.ENDIAN_NAME:
|
|
return "Unknown endian (%s)" % self["endian"].value
|
|
return ""
|
|
|
|
|
|
class SectionFlags(FieldSet):
|
|
|
|
def createFields(self):
|
|
field_thunks = (
|
|
lambda: Bit(self, "is_writable", "Section contains writable data?"),
|
|
lambda: Bit(self, "is_alloc", "Section occupies memory?"),
|
|
lambda: Bit(self, "is_exec", "Section contains executable instructions?"),
|
|
lambda: NullBits(self, "reserved[]", 1),
|
|
lambda: Bit(self, "is_merged", "Section might be merged to eliminate duplication?"),
|
|
lambda: Bit(self, "is_strings", "Section contains nul terminated strings?"),
|
|
lambda: Bit(self, "is_info_link", "sh_info field of this section header holds section header table index?"),
|
|
lambda: Bit(self, "preserve_link_order", "Section requires special ordering for linker?"),
|
|
lambda: Bit(self, "os_nonconforming", "Section rqeuires OS-specific processing?"),
|
|
lambda: Bit(self, "is_group", "Section is a member of a section group?"),
|
|
lambda: Bit(self, "is_tls", "Section contains TLS data?"),
|
|
lambda: Bit(self, "is_compressed", "Section contains compressed data?"),
|
|
lambda: NullBits(self, "reserved[]", 8),
|
|
lambda: RawBits(self, "os_specific", 8, "OS specific flags"),
|
|
lambda: RawBits(self, "processor_specific", 4, "Processor specific flags"),
|
|
)
|
|
|
|
if self.root.endian == BIG_ENDIAN:
|
|
if self.root.is64bit:
|
|
yield RawBits(self, "reserved[]", 32)
|
|
for t in reversed(field_thunks):
|
|
yield t()
|
|
else:
|
|
for t in field_thunks:
|
|
yield t()
|
|
if self.root.is64bit:
|
|
yield RawBits(self, "reserved[]", 32)
|
|
|
|
|
|
class SymbolStringTableOffset(UInt32):
|
|
|
|
def createDisplay(self):
|
|
section_index = self['/header/shstrndx'].value
|
|
section = self['/section[' + str(section_index) + ']']
|
|
text = section.value[self.value:]
|
|
text = text.decode('utf-8')
|
|
return text.split('\0', 1)[0]
|
|
|
|
|
|
class SectionHeader32(FieldSet):
|
|
static_size = 40 * 8
|
|
TYPE_NAME = {
|
|
# sh_type, SHT_ defines
|
|
0: "Inactive",
|
|
1: "Program defined information",
|
|
2: "Symbol table section",
|
|
3: "String table section",
|
|
4: "Relocation section with addends",
|
|
5: "Symbol hash table section",
|
|
6: "Dynamic section",
|
|
7: "Note section",
|
|
8: "Block started by symbol (BSS) or No space section",
|
|
9: "Relocation section without addends",
|
|
10: "Reserved - purpose unknown",
|
|
11: "Dynamic symbol table section",
|
|
}
|
|
|
|
def createFields(self):
|
|
yield SymbolStringTableOffset(self, "name", "Section name (index into section header string table)")
|
|
yield Enum(textHandler(UInt32(self, "type", "Section type"), hexadecimal), self.TYPE_NAME)
|
|
yield SectionFlags(self, "flags", "Section flags")
|
|
yield textHandler(UInt32(self, "VMA", "Virtual memory address"), hexadecimal)
|
|
yield textHandler(UInt32(self, "LMA", "Logical memory address (offset in file)"), hexadecimal)
|
|
yield textHandler(UInt32(self, "size", "Section size (bytes)"), hexadecimal)
|
|
yield UInt32(self, "link", "Index of a related section")
|
|
yield UInt32(self, "info", "Type-dependent information")
|
|
yield UInt32(self, "addr_align", "Address alignment (bytes)")
|
|
yield UInt32(self, "entry_size", "Size of each entry in section")
|
|
|
|
def createDescription(self):
|
|
return "Section header (name: %s, type: %s)" % \
|
|
(self["name"].display, self["type"].display)
|
|
|
|
|
|
class SectionHeader64(SectionHeader32):
|
|
static_size = 64 * 8
|
|
|
|
def createFields(self):
|
|
yield SymbolStringTableOffset(self, "name", "Section name (index into section header string table)")
|
|
yield Enum(textHandler(UInt32(self, "type", "Section type"), hexadecimal), self.TYPE_NAME)
|
|
yield SectionFlags(self, "flags", "Section flags")
|
|
yield textHandler(UInt64(self, "VMA", "Virtual memory address"), hexadecimal)
|
|
yield textHandler(UInt64(self, "LMA", "Logical memory address (offset in file)"), hexadecimal)
|
|
yield textHandler(UInt64(self, "size", "Section size (bytes)"), hexadecimal)
|
|
yield UInt32(self, "link", "Index of a related section")
|
|
yield UInt32(self, "info", "Type-dependent information")
|
|
yield UInt64(self, "addr_align", "Address alignment (bytes)")
|
|
yield UInt64(self, "entry_size", "Size of each entry in section")
|
|
|
|
|
|
class ProgramFlags(FieldSet):
|
|
static_size = 32
|
|
FLAGS = (('pf_r', 'readable'), ('pf_w', 'writable'), ('pf_x', 'executable'))
|
|
|
|
def createFields(self):
|
|
if self.root.endian == BIG_ENDIAN:
|
|
yield NullBits(self, "padding[]", 29)
|
|
for fld, desc in self.FLAGS:
|
|
yield Bit(self, fld, "Segment is " + desc)
|
|
else:
|
|
for fld, desc in reversed(self.FLAGS):
|
|
yield Bit(self, fld, "Segment is " + desc)
|
|
yield NullBits(self, "padding[]", 29)
|
|
|
|
def createDescription(self):
|
|
attribs = []
|
|
for fld, desc in self.FLAGS:
|
|
if self[fld].value:
|
|
attribs.append(desc)
|
|
return 'Segment is ' + ', '.join(attribs)
|
|
|
|
|
|
class ProgramHeader32(FieldSet):
|
|
TYPE_NAME = {
|
|
# p_type, PT_ defines
|
|
0: "Unused program header table entry",
|
|
1: "Loadable program segment",
|
|
2: "Dynamic linking information",
|
|
3: "Program interpreter",
|
|
4: "Auxiliary information",
|
|
5: "Reserved, unspecified semantics",
|
|
6: "Entry for header table itself",
|
|
7: "Thread Local Storage segment",
|
|
0x70000000: "MIPS_REGINFO",
|
|
}
|
|
static_size = 32 * 8
|
|
|
|
def createFields(self):
|
|
yield Enum(UInt32(self, "type", "Segment type"), ProgramHeader32.TYPE_NAME)
|
|
yield UInt32(self, "offset", "Offset")
|
|
yield textHandler(UInt32(self, "vaddr", "V. address"), hexadecimal)
|
|
yield textHandler(UInt32(self, "paddr", "P. address"), hexadecimal)
|
|
yield UInt32(self, "file_size", "File size")
|
|
yield UInt32(self, "mem_size", "Memory size")
|
|
yield ProgramFlags(self, "flags")
|
|
yield UInt32(self, "align", "Alignment padding")
|
|
|
|
def createDescription(self):
|
|
return "Program Header (%s)" % self["type"].display
|
|
|
|
|
|
class ProgramHeader64(ProgramHeader32):
|
|
static_size = 56 * 8
|
|
|
|
def createFields(self):
|
|
yield Enum(UInt32(self, "type", "Segment type"), ProgramHeader32.TYPE_NAME)
|
|
yield ProgramFlags(self, "flags")
|
|
yield UInt64(self, "offset", "Offset")
|
|
yield textHandler(UInt64(self, "vaddr", "V. address"), hexadecimal)
|
|
yield textHandler(UInt64(self, "paddr", "P. address"), hexadecimal)
|
|
yield UInt64(self, "file_size", "File size")
|
|
yield UInt64(self, "mem_size", "Memory size")
|
|
yield UInt64(self, "align", "Alignment padding")
|
|
|
|
|
|
class ElfFile(HachoirParser, RootSeekableFieldSet):
|
|
PARSER_TAGS = {
|
|
"id": "elf",
|
|
"category": "program",
|
|
"file_ext": ("so", ""),
|
|
"min_size": 52 * 8, # At least one program header
|
|
"mime": (
|
|
"application/x-executable",
|
|
"application/x-object",
|
|
"application/x-sharedlib",
|
|
"application/x-executable-file",
|
|
"application/x-coredump"),
|
|
"magic": ((ElfHeader.MAGIC, 0),),
|
|
"description": "ELF Unix/BSD program/library"
|
|
}
|
|
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, len(ElfHeader.MAGIC)) != ElfHeader.MAGIC:
|
|
return "Invalid magic"
|
|
err = self["header"].isValid()
|
|
if err:
|
|
return err
|
|
return True
|
|
|
|
def createFields(self):
|
|
# Choose the right endian depending on endian specified in header
|
|
if self.stream.readBits(5 * 8, 8, BIG_ENDIAN) == ElfHeader.BIG_ENDIAN_ID:
|
|
self.endian = BIG_ENDIAN
|
|
else:
|
|
self.endian = LITTLE_ENDIAN
|
|
|
|
# Parse header and program headers
|
|
yield ElfHeader(self, "header", "Header")
|
|
self.is64bit = (self["header/class"].value == 2)
|
|
|
|
for index in range(self["header/phnum"].value):
|
|
if self.is64bit:
|
|
yield ProgramHeader64(self, "prg_header[]")
|
|
else:
|
|
yield ProgramHeader32(self, "prg_header[]")
|
|
|
|
self.seekByte(self["header/shoff"].value, relative=False)
|
|
|
|
for index in range(self["header/shnum"].value):
|
|
if self.is64bit:
|
|
yield SectionHeader64(self, "section_header[]")
|
|
else:
|
|
yield SectionHeader32(self, "section_header[]")
|
|
|
|
for index in range(self["header/shnum"].value):
|
|
field = self["section_header[" + str(index) + "]"]
|
|
if field['size'].value != 0 and field['type'].value != 8:
|
|
# skip NOBITS sections
|
|
self.seekByte(field['LMA'].value, relative=False)
|
|
yield RawBytes(self, "section[" + str(index) + "]", field['size'].value)
|
|
|
|
def createDescription(self):
|
|
return "ELF Unix/BSD program/library: %s" % (
|
|
self["header/class"].display)
|