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#!/usr/bin/env python
#
# Common corpus functions
import logging
import struct
log = logging.getLogger(__name__)
class BaseType(object):
TYPE_URL = 1
TYPE_RSP1 = 2
TYPE_USERNAME = 3
TYPE_PASSWORD = 4
TYPE_POSTFIELDS = 5
TYPE_HEADER = 6
TYPE_COOKIE = 7
TYPE_UPLOAD1 = 8
TYPE_RANGE = 9
TYPE_CUSTOMREQUEST = 10
TYPE_MAIL_RECIPIENT = 11
TYPE_MAIL_FROM = 12
class TLVEncoder(BaseType):
def __init__(self, output):
self.output = output
def write_string(self, tlv_type, wstring):
data = wstring.encode("utf-8")
self.write_tlv(tlv_type, len(data), data)
def write_bytes(self, tlv_type, bytedata):
self.write_tlv(tlv_type, len(bytedata), bytedata)
def maybe_write_string(self, tlv_type, wstring):
if wstring is not None:
self.write_string(tlv_type, wstring)
def write_tlv(self, tlv_type, tlv_length, tlv_data=None):
log.debug("Writing TLV %d, length %d, data %r",
tlv_type,
tlv_length,
tlv_data)
data = struct.pack("!H", tlv_type)
self.output.write(data)
data = struct.pack("!L", tlv_length)
self.output.write(data)
if tlv_data:
self.output.write(tlv_data)
class TLVDecoder(BaseType):
def __init__(self, inputdata):
self.inputdata = inputdata
self.pos = 0
self.tlv = None
def __iter__(self):
self.pos = 0
self.tlv = None
return self
def __next__(self):
if self.tlv:
self.pos += self.tlv.total_length()
if (self.pos + TLVHeader.TLV_DECODE_FMT_LEN) > len(self.inputdata):
raise StopIteration
# Get the next TLV
self.tlv = TLVHeader(self.inputdata[self.pos:])
return self.tlv
next = __next__
class TLVHeader(BaseType):
TLV_DECODE_FMT = "!HL"
TLV_DECODE_FMT_LEN = struct.calcsize(TLV_DECODE_FMT)
def __init__(self, data):
# Parse the data to populate the TLV fields
(self.type, self.length) = struct.unpack(self.TLV_DECODE_FMT, data[0:self.TLV_DECODE_FMT_LEN])
# Get the remaining data and store it.
self.data = data[self.TLV_DECODE_FMT_LEN:self.TLV_DECODE_FMT_LEN + self.length]
def __repr__(self):
return ("{self.__class__.__name__}(type={self.type!r}, length={self.length!r}, data={self.data!r})"
.format(self=self))
def total_length(self):
return self.TLV_DECODE_FMT_LEN + self.length
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