[[666]] の続きというか一区切り。
インポート情報にも、Import Name Table(INT) と Import Address Table (IAT)、バインドされたインポート情報、遅延ロードされるインポート情報がある。
この内、IATとINTについて表示するPythonスクリプトがひとまず動いたので、載せておく。
バインドされたインポート情報や遅延ロードについては見るDataDirectoryが異なる為、まだ取得出来ていない。

[[666]] では未対応だった序数インポート情報を表示出来るように解決した。
#more||
* ソース全体

show_imports.py:
#code|python|>
class IMAGE_OPTIONAL_HEADER(ctypes.Structure):
  _fields_ = [
      ('Magic', WORD),
      ('MajorLinkerVersion', BYTE),
      ('MinorLinkerVersion', BYTE),
      ('SizeOfCode', DWORD),
      ('SizeOfInitializedData', DWORD),
      ('SizeOfUninitializedData', DWORD),
      ('AddressOfEntryPoint', DWORD),
      ('BaseOfCode', DWORD),
      ('BaseOfData', DWORD),
      ('ImageBase', DWORD),
      ('SectionAlignment', DWORD),
      ('FileAlignment', DWORD),
      ('MajorOperatingSystemVersion', WORD),
      ('MinorOperatingSystemVersion', WORD),
      ('MajorImageVersion', WORD),
      ('MinorImageVersion', WORD),
      ('MajorSubsystemVersion', WORD),
      ('MinorSubsystemVersion', WORD),
      ('Win32VersionValue', DWORD),
      ('SizeOfImage', DWORD),
      ('SizeOfHeaders', DWORD),
      ('CheckSum', DWORD),
      ('Subsystem', WORD),
      ('DllCharacteristics', WORD),
      ('SizeOfStackReserve', DWORD),
      ('SizeOfStackCommit', DWORD),
      ('SizeOfHeapReserve', DWORD),
      ('SizeOfHeapCommit', DWORD),
      ('LoaderFlags', DWORD),
      ('NumberOfRvaAndSizes', DWORD),
      ('DataDirectory', IMAGE_DATA_DIRECTORY * IMAGE_NUMBEROF_DIRECTORY_ENTRIES ),
      ]

class IMAGE_NT_HEADERS(ctypes.Structure):
  _fields_ = [
      ('Signature', DWORD),
      ('FileHeader', IMAGE_FILE_HEADER),
      ('OptionalHeader', IMAGE_OPTIONAL_HEADER),
      ]

IMAGE_SIZEOF_SHORT_NAME = 8

class IMAGE_SECTION_HEADER_MISC(ctypes.Union):
  _fields_ = [
      ('PhysicalAddress', DWORD),
      ('VirtualSize', DWORD),
      ]

class IMAGE_SECTION_HEADER(ctypes.Structure):
  _fields_ = [
      ('Name', BYTE * IMAGE_SIZEOF_SHORT_NAME),
      ('Misc', IMAGE_SECTION_HEADER_MISC),
      ('VirtualAddress', DWORD),
      ('SizeOfRawData', DWORD),
      ('PointerToRawData', DWORD),
      ('PointerToRelocations', DWORD),
      ('PointerToLinenumbers', DWORD),
      ('NumberOfRelocations', WORD),
      ('NumberOfLinenumbers', WORD),
      ('Characteristics', DWORD),
      ]

class IMAGE_IMPORT_DESCRIPTOR_MISC(ctypes.Union):
  _fields_ = [
      # 0 for terminating null import descriptor
      ('Characteristics', DWORD), 
      #  RVA to original unbound IAT (PIMAGE_THUNK_DATA)
      ('OriginalFirstThunk', DWORD), 
      ]

class IMAGE_IMPORT_DESCRIPTOR(ctypes.Structure):
  _fields_ = [
      ('Misc', IMAGE_IMPORT_DESCRIPTOR_MISC),
      # 0 if not bound,
      # -1 if bound, and real date/time stamp
      #     in IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT (new BIND)
      # O.W. date/time stamp of DLL bound to (Old BIND)
      ('TimeDateStamp', DWORD),
      ('ForwarderChain', DWORD), # -1 if no forwarders
      ('Name', DWORD), 
      # RVA to IAT (if bound this IAT has actual addresses)
      ('FirstThunk', DWORD), 
      ]


class IMAGE_IMPORT_BY_NAME(ctypes.Structure):
  _fields_ = [
      ('Hint', WORD),
      ('Name', BYTE),
      ]

class IMAGE_THUNK_DATA(ctypes.Union):
  _fields_ = [
      ('ForwarderString', DWORD), # PBYTE
      ('Function', DWORD), # PDWORD
      ('Ordinal', DWORD), 
      ('AddressOfData', DWORD), # PIMAGE_IMPORT_BY_NAME
      ]

IMAGE_ORDINAL_FLAG64 = 0x8000000000000000
IMAGE_ORDINAL_FLAG32 = 0x80000000

def IMAGE_ORDINAL64(Ordinal):
  return (Ordinal & 0xffff)

def IMAGE_ORDINAL32(Ordinal):
  return (Ordinal & 0xffff)

def IMAGE_SNAP_BY_ORDINAL64(Ordinal):
  return ((Ordinal & IMAGE_ORDINAL_FLAG64) != 0)

def IMAGE_SNAP_BY_ORDINAL32(Ordinal):
  return ((Ordinal & IMAGE_ORDINAL_FLAG32) != 0)


# }}}

if 2 != len(sys.argv):
  print 'usage: python %s filename' % sys.argv[0]
  quit()

file_name = sys.argv[1]

logging.basicConfig(
    level=logging.DEBUG,
    format='%(asctime)s %(name)s %(levelname)s %(message)s',
    )
log = logging.getLogger('main')

try:
  f = open(file_name, 'rb')
except IOError, e:
  log.error("open(%s) faileed." % file_name)
  log.error(e)
  raise e

#  read IMAGE_DOS_HEADER

f.seek(0, 0)
sz = ctypes.sizeof(IMAGE_DOS_HEADER)
data = f.read(sz)
dos_header = IMAGE_DOS_HEADER()
fit = min(len(data), sz)
ctypes.memmove(ctypes.addressof(dos_header), data, fit)

#  read IMAGE_NT_HEADERS

f.seek(dos_header.e_lfanew, 0)
sz = ctypes.sizeof(IMAGE_NT_HEADERS)
data = f.read(sz)
pe_header = IMAGE_NT_HEADERS()
fit = min(len(data), sz)
ctypes.memmove(ctypes.addressof(pe_header), data, fit)

file_header = pe_header.FileHeader
opt_header = pe_header.OptionalHeader

# enumerate IMAGE_SECTION_HEADER array
section_headers = []
section_header_sz = ctypes.sizeof(IMAGE_SECTION_HEADER)
for i in range(file_header.NumberOfSections):
  data = f.read(section_header_sz)
  section_header = IMAGE_SECTION_HEADER()
  fit = min(len(data), sz)
  ctypes.memmove(ctypes.addressof(section_header), data, fit)
  section_headers.append(section_header)

# load to memory
f.seek(0, 0)
file_bytes = f.read() # read all file contents
image_buf = ctypes.create_string_buffer(opt_header.SizeOfImage)
ctypes.memset(image_buf, 0, opt_header.SizeOfImage)
image_buf_ptr = ctypes.addressof(image_buf)

# copy headers
ctypes.memmove(
    image_buf_ptr, 
    file_bytes,
    opt_header.SizeOfHeaders
    )

# copy section datas
for h in section_headers:
  section_virtual_addr = h.VirtualAddress
  pointer_to_rawdata = h.PointerToRawData
  size_of_rawdata = h.SizeOfRawData
  if pointer_to_rawdata :
    ctypes.memmove(
        image_buf_ptr + section_virtual_addr,
        file_bytes[pointer_to_rawdata:pointer_to_rawdata + size_of_rawdata],
        size_of_rawdata)

import_directory_entry = opt_header.DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT]
import_directory_rva = import_directory_entry.VirtualAddress
import_directory_head = image_buf_ptr + import_directory_rva

# build IMAGE_IMPORT_DESCRIPTOR array
import_descriptors = []
sz = ctypes.sizeof(IMAGE_IMPORT_DESCRIPTOR)
offset = 0
while 1:
  import_descriptor = IMAGE_IMPORT_DESCRIPTOR()
  ctypes.memmove(
      ctypes.addressof(import_descriptor), 
      import_directory_head + offset,
      sz)
  offset = offset + sz
  if 0 == import_descriptor.FirstThunk:
    break
  import_descriptors.append(import_descriptor)

# enumerate IMAGE_IMPORT_DESCRIPTOR array
for d in import_descriptors:
  print "------------"
  print "OriginalFirstThunk(INT) RVA = %04X" % d.Misc.OriginalFirstThunk
  print "TimeDateStamp = %04X" % d.TimeDateStamp
  print "ForwarderChain = %04X" % d.ForwarderChain
  module_name = ctypes.c_char_p(image_buf_ptr + d.Name)
  print "Name = %s [RVA=%04X]" % (module_name.value, d.Name)
  print "FirstThunk(IAT) RVA = %04X" % d.FirstThunk
  # enumerate FirstThunk records
  ft_thunk_head = image_buf_ptr + d.FirstThunk
  ft_thunk_sz = ctypes.sizeof(IMAGE_THUNK_DATA)
  ft_thunks = []
  ft_thunk_offset = 0
  while 1:
    ft_thunk = IMAGE_THUNK_DATA()
    ctypes.memmove(
        ctypes.addressof(ft_thunk),
        ft_thunk_head + ft_thunk_offset,
        ft_thunk_sz)
    ft_thunk_offset = ft_thunk_offset + ft_thunk_sz
    if 0 == ft_thunk.Ordinal :
      break
    ft_thunks.append(ft_thunk)
  for ft_thunk in ft_thunks:
    print "FirstThunk: %08X" % ft_thunk.Ordinal
  # enumerate OriginalFirstThunk records
  if 0 != d.Misc.OriginalFirstThunk :
    oft_thunk_head = image_buf_ptr + d.Misc.OriginalFirstThunk
    oft_thunk_sz = ctypes.sizeof(IMAGE_THUNK_DATA)
    oft_thunks = []
    oft_thunk_offset = 0
    while 1:
      oft_thunk = IMAGE_THUNK_DATA()
      ctypes.memmove(
          ctypes.addressof(oft_thunk),
          oft_thunk_head + oft_thunk_offset,
          oft_thunk_sz)
      oft_thunk_offset = oft_thunk_offset + oft_thunk_sz
      if 0 == oft_thunk.Ordinal :
        break
      oft_thunks.append(oft_thunk)
    for oft_thunk in oft_thunks:
      print "OriginalFirstThunk: %08X" % oft_thunk.Ordinal
      if IMAGE_SNAP_BY_ORDINAL32(oft_thunk.Ordinal):
        print "\tOrdinal: %d" % IMAGE_ORDINAL32(oft_thunk.Ordinal)
      else:
        hint_data = IMAGE_IMPORT_BY_NAME()
        hint_data_sz = ctypes.sizeof(IMAGE_IMPORT_BY_NAME)
        ctypes.memmove(
            ctypes.addressof(hint_data),
            image_buf_ptr + oft_thunk.AddressOfData,
            hint_data_sz)
        print "\tHint: %04X" % hint_data.Hint
        hint_data_name_ptr = image_buf_ptr + \
            oft_thunk.AddressOfData + \
            ctypes.sizeof(WORD)
        hint_data_name = ctypes.c_char_p(hint_data_name_ptr)
        print "\tName: %s" % hint_data_name.value

||<

* 修正箇所

OriginalFirstThunkの32bit目が0なら名前によるインポート、1なら序数によるインポートとして処理するよう作り替えた。
#code|python|>
    for oft_thunk in oft_thunks:
      print "OriginalFirstThunk: %08X" % oft_thunk.Ordinal
      if IMAGE_SNAP_BY_ORDINAL32(oft_thunk.Ordinal):
        # 序数によるインポート
        print "\tOrdinal: %d" % IMAGE_ORDINAL32(oft_thunk.Ordinal)
      else:
        # 名前によるインポート
        hint_data = IMAGE_IMPORT_BY_NAME()
        hint_data_sz = ctypes.sizeof(IMAGE_IMPORT_BY_NAME)
        ctypes.memmove(
            ctypes.addressof(hint_data),
            image_buf_ptr + oft_thunk.AddressOfData,
            hint_data_sz)
        print "\tHint: %04X" % hint_data.Hint
        hint_data_name_ptr = image_buf_ptr + \
            oft_thunk.AddressOfData + \
            ctypes.sizeof(WORD)
        hint_data_name = ctypes.c_char_p(hint_data_name_ptr)
        print "\tName: %s" % hint_data_name.value
||<

ifで使っているIMAGE_SNAP_BY_ORDINAL32は32bit用の判別処理で、WinNT.hからのパクリ。