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Edit File : _elffile.py \| Size : 3.21 KB
""" ELF file parser. This provides a class ``ELFFile`` that parses an ELF executable in a similar interface to ``ZipFile``. Only the read interface is implemented. Based on: https://gist.github.com/lyssdod/f51579ae8d93c8657a5564aefc2ffbca ELF header: https://refspecs.linuxfoundation.org/elf/gabi4+/ch4.eheader.html """ from __future__ import annotations import enum import os import struct from typing import IO class ELFInvalid(ValueError): pass class EIClass(enum.IntEnum): C32 = 1 C64 = 2 class EIData(enum.IntEnum): Lsb = 1 Msb = 2 class EMachine(enum.IntEnum): I386 = 3 S390 = 22 Arm = 40 X8664 = 62 AArc64 = 183 class ELFFile: """ Representation of an ELF executable. """ def __init__(self, f: IO[bytes]) -> None: self._f = f try: ident = self._read("16B") except struct.error as e: raise ELFInvalid("unable to parse identification") from e magic = bytes(ident[:4]) if magic != b"\x7fELF": raise ELFInvalid(f"invalid magic: {magic!r}") self.capacity = ident[4] # Format for program header (bitness). self.encoding = ident[5] # Data structure encoding (endianness). try: # e_fmt: Format for program header. # p_fmt: Format for section header. # p_idx: Indexes to find p_type, p_offset, and p_filesz. e_fmt, self._p_fmt, self._p_idx = { (1, 1): ("<HHIIIIIHHH", "<IIIIIIII", (0, 1, 4)), # 32-bit LSB. (1, 2): (">HHIIIIIHHH", ">IIIIIIII", (0, 1, 4)), # 32-bit MSB. (2, 1): ("<HHIQQQIHHH", "<IIQQQQQQ", (0, 2, 5)), # 64-bit LSB. (2, 2): (">HHIQQQIHHH", ">IIQQQQQQ", (0, 2, 5)), # 64-bit MSB. }[(self.capacity, self.encoding)] except KeyError as e: raise ELFInvalid( f"unrecognized capacity ({self.capacity}) or encoding ({self.encoding})" ) from e try: ( _, self.machine, # Architecture type. _, _, self._e_phoff, # Offset of program header. _, self.flags, # Processor-specific flags. _, self._e_phentsize, # Size of section. self._e_phnum, # Number of sections. ) = self._read(e_fmt) except struct.error as e: raise ELFInvalid("unable to parse machine and section information") from e def _read(self, fmt: str) -> tuple[int, ...]: return struct.unpack(fmt, self._f.read(struct.calcsize(fmt))) @property def interpreter(self) -> str \| None: """ The path recorded in the ``PT_INTERP`` section header. """ for index in range(self._e_phnum): self._f.seek(self._e_phoff + self._e_phentsize * index) try: data = self._read(self._p_fmt) except struct.error: continue if data[self._p_idx[0]] != 3: # Not PT_INTERP. continue self._f.seek(data[self._p_idx[1]]) return os.fsdecode(self._f.read(data[self._p_idx[2]])).strip("\0") return None Back

Edit File : _elffile.py | Size : 3.21 KB

"""
ELF file parser.

This provides a class ``ELFFile`` that parses an ELF executable in a similar
interface to ``ZipFile``. Only the read interface is implemented.

Based on: https://gist.github.com/lyssdod/f51579ae8d93c8657a5564aefc2ffbca
ELF header: https://refspecs.linuxfoundation.org/elf/gabi4+/ch4.eheader.html
"""

from __future__ import annotations

import enum
import os
import struct
from typing import IO

class ELFInvalid(ValueError):
    pass

class EIClass(enum.IntEnum):
    C32 = 1
    C64 = 2

class EIData(enum.IntEnum):
    Lsb = 1
    Msb = 2

class EMachine(enum.IntEnum):
    I386 = 3
    S390 = 22
    Arm = 40
    X8664 = 62
    AArc64 = 183

class ELFFile:
    """
    Representation of an ELF executable.
    """

def __init__(self, f: IO[bytes]) -> None:
        self._f = f

try:
            ident = self._read("16B")
        except struct.error as e:
            raise ELFInvalid("unable to parse identification") from e
        magic = bytes(ident[:4])
        if magic != b"\x7fELF":
            raise ELFInvalid(f"invalid magic: {magic!r}")

self.capacity = ident[4]  # Format for program header (bitness).
        self.encoding = ident[5]  # Data structure encoding (endianness).

try:
            # e_fmt: Format for program header.
            # p_fmt: Format for section header.
            # p_idx: Indexes to find p_type, p_offset, and p_filesz.
            e_fmt, self._p_fmt, self._p_idx = {
                (1, 1): ("<HHIIIIIHHH", "<IIIIIIII", (0, 1, 4)),  # 32-bit LSB.
                (1, 2): (">HHIIIIIHHH", ">IIIIIIII", (0, 1, 4)),  # 32-bit MSB.
                (2, 1): ("<HHIQQQIHHH", "<IIQQQQQQ", (0, 2, 5)),  # 64-bit LSB.
                (2, 2): (">HHIQQQIHHH", ">IIQQQQQQ", (0, 2, 5)),  # 64-bit MSB.
            }[(self.capacity, self.encoding)]
        except KeyError as e:
            raise ELFInvalid(
                f"unrecognized capacity ({self.capacity}) or encoding ({self.encoding})"
            ) from e

try:
            (
                _,
                self.machine,  # Architecture type.
                _,
                _,
                self._e_phoff,  # Offset of program header.
                _,
                self.flags,  # Processor-specific flags.
                _,
                self._e_phentsize,  # Size of section.
                self._e_phnum,  # Number of sections.
            ) = self._read(e_fmt)
        except struct.error as e:
            raise ELFInvalid("unable to parse machine and section information") from e

def _read(self, fmt: str) -> tuple[int, ...]:
        return struct.unpack(fmt, self._f.read(struct.calcsize(fmt)))

@property
    def interpreter(self) -> str | None:
        """
        The path recorded in the ``PT_INTERP`` section header.
        """
        for index in range(self._e_phnum):
            self._f.seek(self._e_phoff + self._e_phentsize * index)
            try:
                data = self._read(self._p_fmt)
            except struct.error:
                continue
            if data[self._p_idx[0]] != 3:  # Not PT_INTERP.
                continue
            self._f.seek(data[self._p_idx[1]])
            return os.fsdecode(self._f.read(data[self._p_idx[2]])).strip("\0")
        return None

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