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260 lines
7.3 KiB
Python
Executable File
260 lines
7.3 KiB
Python
Executable File
#!/usr/bin/env python
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import struct
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import sys
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import StringIO
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class Reader:
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def __init__(self, path):
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if path == '-':
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# Snarf all the data so we can seek.
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self.file = StringIO.StringIO(sys.stdin.read())
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else:
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self.file = open(path,'rb')
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self.isLSB = None
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self.string_table = None
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def setLSB(self, isLSB):
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self.isLSB = bool(isLSB)
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def tell(self):
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return self.file.tell()
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def seek(self, pos):
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self.file.seek(pos)
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def read(self, N):
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data = self.file.read(N)
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if len(data) != N:
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raise ValueError,"Out of data!"
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return data
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def read8(self):
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return ord(self.read(1))
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def read16(self):
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return struct.unpack('><'[self.isLSB] + 'H', self.read(2))[0]
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def read32(self):
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# Force to 32-bit, if possible; otherwise these might be long ints on a
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# big-endian platform. FIXME: Why???
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Value = struct.unpack('><'[self.isLSB] + 'I', self.read(4))[0]
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return int(Value)
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def registerStringTable(self, strings):
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if self.string_table is not None:
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raise ValueError,"%s: warning: multiple string tables" % sys.argv[0]
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self.string_table = strings
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def getString(self, index):
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if self.string_table is None:
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raise ValueError,"%s: warning: no string table registered" % sys.argv[0]
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end = self.string_table.index('\x00', index)
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return self.string_table[index:end]
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def dumpmacho(path, opts):
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f = Reader(path)
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magic = f.read(4)
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if magic == '\xFE\xED\xFA\xCE':
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f.setLSB(False)
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elif magic == '\xCE\xFA\xED\xFE':
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f.setLSB(True)
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else:
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raise ValueError,"Not a Mach-O object file: %r (bad magic)" % path
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print "('cputype', %r)" % f.read32()
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print "('cpusubtype', %r)" % f.read32()
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filetype = f.read32()
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print "('filetype', %r)" % filetype
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numLoadCommands = f.read32()
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print "('num_load_commands', %r)" % filetype
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loadCommandsSize = f.read32()
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print "('load_commands_size', %r)" % loadCommandsSize
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print "('flag', %r)" % f.read32()
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start = f.tell()
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print "('load_commands', ["
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for i in range(numLoadCommands):
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dumpLoadCommand(f, i, opts)
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print "])"
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if f.tell() - start != loadCommandsSize:
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raise ValueError,"%s: warning: invalid load commands size: %r" % (sys.argv[0], loadCommandsSize)
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def dumpLoadCommand(f, i, opts):
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start = f.tell()
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print " # Load Command %r" % i
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cmd = f.read32()
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print " (('command', %r)" % cmd
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cmdSize = f.read32()
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print " ('size', %r)" % cmdSize
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if cmd == 1:
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dumpSegmentLoadCommand32(f, opts)
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elif cmd == 2:
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dumpSymtabCommand(f, opts)
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elif cmd == 11:
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dumpDysymtabCommand(f, opts)
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elif cmd == 27:
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import uuid
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print " ('uuid', %s)" % uuid.UUID(bytes=f.read(16))
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else:
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print >>sys.stderr,"%s: warning: unknown load command: %r" % (sys.argv[0], cmd)
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f.read(cmdSize - 8)
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print " ),"
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if f.tell() - start != cmdSize:
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raise ValueError,"%s: warning: invalid load command size: %r" % (sys.argv[0], cmdSize)
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def dumpSegmentLoadCommand32(f, opts):
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print " ('segment_name', %r)" % f.read(16)
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print " ('vm_addr', %r)" % f.read32()
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print " ('vm_size', %r)" % f.read32()
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print " ('file_offset', %r)" % f.read32()
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print " ('file_size', %r)" % f.read32()
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print " ('maxprot', %r)" % f.read32()
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print " ('initprot', %r)" % f.read32()
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numSections = f.read32()
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print " ('num_sections', %r)" % numSections
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print " ('flags', %r)" % f.read32()
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print " ('sections', ["
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for i in range(numSections):
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dumpSection32(f, i, opts)
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print " ])"
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def dumpSymtabCommand(f, opts):
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symoff = f.read32()
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print " ('symoff', %r)" % symoff
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nsyms = f.read32()
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print " ('nsyms', %r)" % nsyms
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stroff = f.read32()
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print " ('stroff', %r)" % stroff
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strsize = f.read32()
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print " ('strsize', %r)" % strsize
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prev_pos = f.tell()
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f.seek(stroff)
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string_data = f.read(strsize)
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print " ('_string_data', %r)" % string_data
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f.registerStringTable(string_data)
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f.seek(symoff)
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print " ('_symbols', ["
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for i in range(nsyms):
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dumpNlist32(f, i, opts)
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print " ])"
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f.seek(prev_pos)
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def dumpNlist32(f, i, opts):
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print " # Symbol %r" % i
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n_strx = f.read32()
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print " (('n_strx', %r)" % n_strx
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n_type = f.read8()
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print " ('n_type', %#x)" % n_type
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n_sect = f.read8()
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print " ('n_sect', %r)" % n_sect
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n_desc = f.read16()
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print " ('n_desc', %r)" % n_desc
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n_value = f.read32()
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print " ('n_value', %r)" % n_value
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print " ('_string', %r)" % f.getString(n_strx)
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print " ),"
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def dumpDysymtabCommand(f, opts):
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print " ('ilocalsym', %r)" % f.read32()
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print " ('nlocalsym', %r)" % f.read32()
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print " ('iextdefsym', %r)" % f.read32()
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print " ('nextdefsym', %r)" % f.read32()
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print " ('iundefsym', %r)" % f.read32()
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print " ('nundefsym', %r)" % f.read32()
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print " ('tocoff', %r)" % f.read32()
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print " ('ntoc', %r)" % f.read32()
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print " ('modtaboff', %r)" % f.read32()
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print " ('nmodtab', %r)" % f.read32()
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print " ('extrefsymoff', %r)" % f.read32()
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print " ('nextrefsyms', %r)" % f.read32()
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indirectsymoff = f.read32()
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print " ('indirectsymoff', %r)" % indirectsymoff
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nindirectsyms = f.read32()
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print " ('nindirectsyms', %r)" % nindirectsyms
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print " ('extreloff', %r)" % f.read32()
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print " ('nextrel', %r)" % f.read32()
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print " ('locreloff', %r)" % f.read32()
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print " ('nlocrel', %r)" % f.read32()
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prev_pos = f.tell()
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f.seek(indirectsymoff)
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print " ('_indirect_symbols', ["
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for i in range(nindirectsyms):
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print " # Indirect Symbol %r" % i
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print " (('symbol_index', %#x),)," % f.read32()
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print " ])"
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f.seek(prev_pos)
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def dumpSection32(f, i, opts):
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print " # Section %r" % i
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print " (('section_name', %r)" % f.read(16)
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print " ('segment_name', %r)" % f.read(16)
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print " ('address', %r)" % f.read32()
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size = f.read32()
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print " ('size', %r)" % size
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offset = f.read32()
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print " ('offset', %r)" % offset
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print " ('alignment', %r)" % f.read32()
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reloc_offset = f.read32()
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print " ('reloc_offset', %r)" % reloc_offset
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num_reloc = f.read32()
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print " ('num_reloc', %r)" % num_reloc
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print " ('flags', %#x)" % f.read32()
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print " ('reserved1', %r)" % f.read32()
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print " ('reserved2', %r)" % f.read32()
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print " ),"
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prev_pos = f.tell()
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f.seek(reloc_offset)
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print " ('_relocations', ["
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for i in range(num_reloc):
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print " # Relocation %r" % i
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print " (('word-0', %#x)," % f.read32()
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print " ('word-1', %#x))," % f.read32()
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print " ])"
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if opts.dumpSectionData:
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f.seek(offset)
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print " ('_section_data', %r)" % f.read(size)
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f.seek(prev_pos)
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def main():
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from optparse import OptionParser, OptionGroup
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parser = OptionParser("usage: %prog [options] {files}")
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parser.add_option("", "--dump-section-data", dest="dumpSectionData",
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help="Dump the contents of sections",
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action="store_true", default=False)
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(opts, args) = parser.parse_args()
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if not args:
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args.append('-')
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for arg in args:
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dumpmacho(arg, opts)
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if __name__ == '__main__':
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main()
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