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