mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-30 11:19:23 +00:00
636 lines
18 KiB
Python
636 lines
18 KiB
Python
import sys
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import struct
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from hpack.hpack import Encoder, Decoder
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from .. import utils
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class FrameSizeError(Exception):
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pass
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class Frame(object):
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"""
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Baseclass Frame
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contains header
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payload is defined in subclasses
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"""
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FLAG_NO_FLAGS = 0x0
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FLAG_ACK = 0x1
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FLAG_END_STREAM = 0x1
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FLAG_END_HEADERS = 0x4
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FLAG_PADDED = 0x8
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FLAG_PRIORITY = 0x20
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def __init__(
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self,
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state=None,
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length=0,
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flags=FLAG_NO_FLAGS,
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stream_id=0x0):
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valid_flags = reduce(lambda x, y: x | y, self.VALID_FLAGS, 0x0)
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if flags | valid_flags != valid_flags:
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raise ValueError('invalid flags detected.')
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if state is None:
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class State(object):
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pass
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state = State()
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state.http2_settings = HTTP2_DEFAULT_SETTINGS.copy()
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state.encoder = Encoder()
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state.decoder = Decoder()
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self.state = state
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self.length = length
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self.type = self.TYPE
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self.flags = flags
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self.stream_id = stream_id
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@classmethod
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def _check_frame_size(cls, length, state):
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if state:
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settings = state.http2_settings
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else:
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settings = HTTP2_DEFAULT_SETTINGS.copy()
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max_frame_size = settings[
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SettingsFrame.SETTINGS.SETTINGS_MAX_FRAME_SIZE]
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if length > max_frame_size:
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raise FrameSizeError(
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"Frame size exceeded: %d, but only %d allowed." % (
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length, max_frame_size))
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@classmethod
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def from_file(cls, fp, state=None):
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"""
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read a HTTP/2 frame sent by a server or client
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fp is a "file like" object that could be backed by a network
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stream or a disk or an in memory stream reader
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"""
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raw_header = fp.safe_read(9)
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fields = struct.unpack("!HBBBL", raw_header)
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length = (fields[0] << 8) + fields[1]
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flags = fields[3]
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stream_id = fields[4]
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if raw_header[:4] == b'HTTP': # pragma no cover
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print >> sys.stderr, "WARNING: This looks like an HTTP/1 connection!"
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cls._check_frame_size(length, state)
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payload = fp.safe_read(length)
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return FRAMES[fields[2]].from_bytes(
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state,
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length,
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flags,
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stream_id,
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payload)
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def to_bytes(self):
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payload = self.payload_bytes()
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self.length = len(payload)
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self._check_frame_size(self.length, self.state)
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b = struct.pack('!HB', self.length & 0xFFFF00, self.length & 0x0000FF)
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b += struct.pack('!B', self.TYPE)
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b += struct.pack('!B', self.flags)
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b += struct.pack('!L', self.stream_id & 0x7FFFFFFF)
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b += payload
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return b
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def payload_bytes(self): # pragma: no cover
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raise NotImplementedError()
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def payload_human_readable(self): # pragma: no cover
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raise NotImplementedError()
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def human_readable(self, direction="-"):
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self.length = len(self.payload_bytes())
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return "\n".join([
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"%s: %s | length: %d | flags: %#x | stream_id: %d" % (direction, self.__class__.__name__, self.length, self.flags, self.stream_id),
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self.payload_human_readable(),
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"===============================================================",
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])
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def __eq__(self, other):
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return self.to_bytes() == other.to_bytes()
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class DataFrame(Frame):
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TYPE = 0x0
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VALID_FLAGS = [Frame.FLAG_END_STREAM, Frame.FLAG_PADDED]
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def __init__(
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self,
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state=None,
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length=0,
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flags=Frame.FLAG_NO_FLAGS,
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stream_id=0x0,
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payload=b'',
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pad_length=0):
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super(DataFrame, self).__init__(state, length, flags, stream_id)
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self.payload = payload
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self.pad_length = pad_length
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@classmethod
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def from_bytes(cls, state, length, flags, stream_id, payload):
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f = cls(state=state, length=length, flags=flags, stream_id=stream_id)
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if f.flags & Frame.FLAG_PADDED:
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f.pad_length = struct.unpack('!B', payload[0])[0]
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f.payload = payload[1:-f.pad_length]
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else:
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f.payload = payload
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return f
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def payload_bytes(self):
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if self.stream_id == 0x0:
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raise ValueError('DATA frames MUST be associated with a stream.')
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b = b''
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if self.flags & self.FLAG_PADDED:
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b += struct.pack('!B', self.pad_length)
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b += bytes(self.payload)
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if self.flags & self.FLAG_PADDED:
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b += b'\0' * self.pad_length
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return b
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def payload_human_readable(self):
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return "payload: %s" % str(self.payload)
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class HeadersFrame(Frame):
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TYPE = 0x1
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VALID_FLAGS = [
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Frame.FLAG_END_STREAM,
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Frame.FLAG_END_HEADERS,
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Frame.FLAG_PADDED,
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Frame.FLAG_PRIORITY]
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def __init__(
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self,
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state=None,
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length=0,
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flags=Frame.FLAG_NO_FLAGS,
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stream_id=0x0,
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header_block_fragment=b'',
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pad_length=0,
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exclusive=False,
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stream_dependency=0x0,
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weight=0):
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super(HeadersFrame, self).__init__(state, length, flags, stream_id)
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self.header_block_fragment = header_block_fragment
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self.pad_length = pad_length
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self.exclusive = exclusive
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self.stream_dependency = stream_dependency
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self.weight = weight
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@classmethod
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def from_bytes(cls, state, length, flags, stream_id, payload):
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f = cls(state=state, length=length, flags=flags, stream_id=stream_id)
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if f.flags & Frame.FLAG_PADDED:
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f.pad_length = struct.unpack('!B', payload[0])[0]
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f.header_block_fragment = payload[1:-f.pad_length]
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else:
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f.header_block_fragment = payload[0:]
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if f.flags & Frame.FLAG_PRIORITY:
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f.stream_dependency, f.weight = struct.unpack(
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'!LB', f.header_block_fragment[:5])
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f.exclusive = bool(f.stream_dependency >> 31)
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f.stream_dependency &= 0x7FFFFFFF
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f.header_block_fragment = f.header_block_fragment[5:]
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return f
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def payload_bytes(self):
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if self.stream_id == 0x0:
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raise ValueError('HEADERS frames MUST be associated with a stream.')
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b = b''
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if self.flags & self.FLAG_PADDED:
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b += struct.pack('!B', self.pad_length)
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if self.flags & self.FLAG_PRIORITY:
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b += struct.pack('!LB',
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(int(self.exclusive) << 31) | self.stream_dependency,
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self.weight)
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b += self.header_block_fragment
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if self.flags & self.FLAG_PADDED:
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b += b'\0' * self.pad_length
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return b
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def payload_human_readable(self):
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s = []
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if self.flags & self.FLAG_PRIORITY:
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s.append("exclusive: %d" % self.exclusive)
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s.append("stream dependency: %#x" % self.stream_dependency)
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s.append("weight: %d" % self.weight)
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if self.flags & self.FLAG_PADDED:
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s.append("padding: %d" % self.pad_length)
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s.append(
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"header_block_fragment: %s" %
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self.header_block_fragment.encode('hex'))
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return "\n".join(s)
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class PriorityFrame(Frame):
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TYPE = 0x2
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VALID_FLAGS = []
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def __init__(
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self,
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state=None,
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length=0,
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flags=Frame.FLAG_NO_FLAGS,
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stream_id=0x0,
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exclusive=False,
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stream_dependency=0x0,
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weight=0):
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super(PriorityFrame, self).__init__(state, length, flags, stream_id)
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self.exclusive = exclusive
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self.stream_dependency = stream_dependency
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self.weight = weight
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@classmethod
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def from_bytes(cls, state, length, flags, stream_id, payload):
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f = cls(state=state, length=length, flags=flags, stream_id=stream_id)
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f.stream_dependency, f.weight = struct.unpack('!LB', payload)
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f.exclusive = bool(f.stream_dependency >> 31)
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f.stream_dependency &= 0x7FFFFFFF
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return f
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def payload_bytes(self):
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if self.stream_id == 0x0:
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raise ValueError(
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'PRIORITY frames MUST be associated with a stream.')
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if self.stream_dependency == 0x0:
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raise ValueError('stream dependency is invalid.')
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return struct.pack(
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'!LB',
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(int(
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self.exclusive) << 31) | self.stream_dependency,
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self.weight)
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def payload_human_readable(self):
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s = []
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s.append("exclusive: %d" % self.exclusive)
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s.append("stream dependency: %#x" % self.stream_dependency)
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s.append("weight: %d" % self.weight)
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return "\n".join(s)
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class RstStreamFrame(Frame):
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TYPE = 0x3
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VALID_FLAGS = []
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def __init__(
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self,
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state=None,
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length=0,
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flags=Frame.FLAG_NO_FLAGS,
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stream_id=0x0,
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error_code=0x0):
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super(RstStreamFrame, self).__init__(state, length, flags, stream_id)
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self.error_code = error_code
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@classmethod
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def from_bytes(cls, state, length, flags, stream_id, payload):
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f = cls(state=state, length=length, flags=flags, stream_id=stream_id)
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f.error_code = struct.unpack('!L', payload)[0]
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return f
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def payload_bytes(self):
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if self.stream_id == 0x0:
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raise ValueError(
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'RST_STREAM frames MUST be associated with a stream.')
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return struct.pack('!L', self.error_code)
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def payload_human_readable(self):
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return "error code: %#x" % self.error_code
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class SettingsFrame(Frame):
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TYPE = 0x4
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VALID_FLAGS = [Frame.FLAG_ACK]
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SETTINGS = utils.BiDi(
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SETTINGS_HEADER_TABLE_SIZE=0x1,
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SETTINGS_ENABLE_PUSH=0x2,
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SETTINGS_MAX_CONCURRENT_STREAMS=0x3,
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SETTINGS_INITIAL_WINDOW_SIZE=0x4,
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SETTINGS_MAX_FRAME_SIZE=0x5,
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SETTINGS_MAX_HEADER_LIST_SIZE=0x6,
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)
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def __init__(
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self,
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state=None,
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length=0,
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flags=Frame.FLAG_NO_FLAGS,
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stream_id=0x0,
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settings=None):
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super(SettingsFrame, self).__init__(state, length, flags, stream_id)
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if settings is None:
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settings = {}
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self.settings = settings
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@classmethod
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def from_bytes(cls, state, length, flags, stream_id, payload):
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f = cls(state=state, length=length, flags=flags, stream_id=stream_id)
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for i in xrange(0, len(payload), 6):
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identifier, value = struct.unpack("!HL", payload[i:i + 6])
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f.settings[identifier] = value
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return f
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def payload_bytes(self):
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if self.stream_id != 0x0:
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raise ValueError(
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'SETTINGS frames MUST NOT be associated with a stream.')
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b = b''
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for identifier, value in self.settings.items():
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b += struct.pack("!HL", identifier & 0xFF, value)
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return b
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def payload_human_readable(self):
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s = []
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for identifier, value in self.settings.items():
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s.append("%s: %#x" % (self.SETTINGS.get_name(identifier), value))
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if not s:
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return "settings: None"
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else:
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return "\n".join(s)
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class PushPromiseFrame(Frame):
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TYPE = 0x5
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VALID_FLAGS = [Frame.FLAG_END_HEADERS, Frame.FLAG_PADDED]
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def __init__(
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self,
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state=None,
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length=0,
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flags=Frame.FLAG_NO_FLAGS,
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stream_id=0x0,
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promised_stream=0x0,
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header_block_fragment=b'',
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pad_length=0):
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super(PushPromiseFrame, self).__init__(state, length, flags, stream_id)
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self.pad_length = pad_length
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self.promised_stream = promised_stream
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self.header_block_fragment = header_block_fragment
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@classmethod
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def from_bytes(cls, state, length, flags, stream_id, payload):
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f = cls(state=state, length=length, flags=flags, stream_id=stream_id)
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if f.flags & Frame.FLAG_PADDED:
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f.pad_length, f.promised_stream = struct.unpack('!BL', payload[:5])
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f.header_block_fragment = payload[5:-f.pad_length]
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else:
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f.promised_stream = int(struct.unpack("!L", payload[:4])[0])
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f.header_block_fragment = payload[4:]
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f.promised_stream &= 0x7FFFFFFF
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return f
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def payload_bytes(self):
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if self.stream_id == 0x0:
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raise ValueError(
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'PUSH_PROMISE frames MUST be associated with a stream.')
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if self.promised_stream == 0x0:
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raise ValueError('Promised stream id not valid.')
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b = b''
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if self.flags & self.FLAG_PADDED:
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b += struct.pack('!B', self.pad_length)
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b += struct.pack('!L', self.promised_stream & 0x7FFFFFFF)
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b += bytes(self.header_block_fragment)
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if self.flags & self.FLAG_PADDED:
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b += b'\0' * self.pad_length
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return b
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def payload_human_readable(self):
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s = []
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if self.flags & self.FLAG_PADDED:
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s.append("padding: %d" % self.pad_length)
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s.append("promised stream: %#x" % self.promised_stream)
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s.append(
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"header_block_fragment: %s" %
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self.header_block_fragment.encode('hex'))
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return "\n".join(s)
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class PingFrame(Frame):
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TYPE = 0x6
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VALID_FLAGS = [Frame.FLAG_ACK]
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def __init__(
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self,
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state=None,
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length=0,
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flags=Frame.FLAG_NO_FLAGS,
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stream_id=0x0,
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payload=b''):
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super(PingFrame, self).__init__(state, length, flags, stream_id)
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self.payload = payload
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@classmethod
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def from_bytes(cls, state, length, flags, stream_id, payload):
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f = cls(state=state, length=length, flags=flags, stream_id=stream_id)
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f.payload = payload
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return f
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def payload_bytes(self):
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if self.stream_id != 0x0:
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raise ValueError(
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'PING frames MUST NOT be associated with a stream.')
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b = self.payload[0:8]
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b += b'\0' * (8 - len(b))
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return b
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def payload_human_readable(self):
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return "opaque data: %s" % str(self.payload)
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class GoAwayFrame(Frame):
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TYPE = 0x7
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VALID_FLAGS = []
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def __init__(
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self,
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state=None,
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length=0,
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flags=Frame.FLAG_NO_FLAGS,
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stream_id=0x0,
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last_stream=0x0,
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error_code=0x0,
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data=b''):
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super(GoAwayFrame, self).__init__(state, length, flags, stream_id)
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self.last_stream = last_stream
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self.error_code = error_code
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self.data = data
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@classmethod
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def from_bytes(cls, state, length, flags, stream_id, payload):
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f = cls(state=state, length=length, flags=flags, stream_id=stream_id)
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f.last_stream, f.error_code = struct.unpack("!LL", payload[:8])
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f.last_stream &= 0x7FFFFFFF
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f.data = payload[8:]
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return f
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def payload_bytes(self):
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if self.stream_id != 0x0:
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raise ValueError(
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'GOAWAY frames MUST NOT be associated with a stream.')
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b = struct.pack('!LL', self.last_stream & 0x7FFFFFFF, self.error_code)
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b += bytes(self.data)
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return b
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def payload_human_readable(self):
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s = []
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s.append("last stream: %#x" % self.last_stream)
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s.append("error code: %d" % self.error_code)
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s.append("debug data: %s" % str(self.data))
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return "\n".join(s)
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class WindowUpdateFrame(Frame):
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TYPE = 0x8
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VALID_FLAGS = []
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def __init__(
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self,
|
|
state=None,
|
|
length=0,
|
|
flags=Frame.FLAG_NO_FLAGS,
|
|
stream_id=0x0,
|
|
window_size_increment=0x0):
|
|
super(WindowUpdateFrame, self).__init__(state, length, flags, stream_id)
|
|
self.window_size_increment = window_size_increment
|
|
|
|
@classmethod
|
|
def from_bytes(cls, state, length, flags, stream_id, payload):
|
|
f = cls(state=state, length=length, flags=flags, stream_id=stream_id)
|
|
|
|
f.window_size_increment = struct.unpack("!L", payload)[0]
|
|
f.window_size_increment &= 0x7FFFFFFF
|
|
|
|
return f
|
|
|
|
def payload_bytes(self):
|
|
if self.window_size_increment <= 0 or self.window_size_increment >= 2 ** 31:
|
|
raise ValueError(
|
|
'Window Szie Increment MUST be greater than 0 and less than 2^31.')
|
|
|
|
return struct.pack('!L', self.window_size_increment & 0x7FFFFFFF)
|
|
|
|
def payload_human_readable(self):
|
|
return "window size increment: %#x" % self.window_size_increment
|
|
|
|
|
|
class ContinuationFrame(Frame):
|
|
TYPE = 0x9
|
|
VALID_FLAGS = [Frame.FLAG_END_HEADERS]
|
|
|
|
def __init__(
|
|
self,
|
|
state=None,
|
|
length=0,
|
|
flags=Frame.FLAG_NO_FLAGS,
|
|
stream_id=0x0,
|
|
header_block_fragment=b''):
|
|
super(ContinuationFrame, self).__init__(state, length, flags, stream_id)
|
|
self.header_block_fragment = header_block_fragment
|
|
|
|
@classmethod
|
|
def from_bytes(cls, state, length, flags, stream_id, payload):
|
|
f = cls(state=state, length=length, flags=flags, stream_id=stream_id)
|
|
f.header_block_fragment = payload
|
|
return f
|
|
|
|
def payload_bytes(self):
|
|
if self.stream_id == 0x0:
|
|
raise ValueError(
|
|
'CONTINUATION frames MUST be associated with a stream.')
|
|
|
|
return self.header_block_fragment
|
|
|
|
def payload_human_readable(self):
|
|
s = []
|
|
s.append(
|
|
"header_block_fragment: %s" %
|
|
self.header_block_fragment.encode('hex'))
|
|
return "\n".join(s)
|
|
|
|
_FRAME_CLASSES = [
|
|
DataFrame,
|
|
HeadersFrame,
|
|
PriorityFrame,
|
|
RstStreamFrame,
|
|
SettingsFrame,
|
|
PushPromiseFrame,
|
|
PingFrame,
|
|
GoAwayFrame,
|
|
WindowUpdateFrame,
|
|
ContinuationFrame
|
|
]
|
|
FRAMES = {cls.TYPE: cls for cls in _FRAME_CLASSES}
|
|
|
|
|
|
HTTP2_DEFAULT_SETTINGS = {
|
|
SettingsFrame.SETTINGS.SETTINGS_HEADER_TABLE_SIZE: 4096,
|
|
SettingsFrame.SETTINGS.SETTINGS_ENABLE_PUSH: 1,
|
|
SettingsFrame.SETTINGS.SETTINGS_MAX_CONCURRENT_STREAMS: None,
|
|
SettingsFrame.SETTINGS.SETTINGS_INITIAL_WINDOW_SIZE: 2 ** 16 - 1,
|
|
SettingsFrame.SETTINGS.SETTINGS_MAX_FRAME_SIZE: 2 ** 14,
|
|
SettingsFrame.SETTINGS.SETTINGS_MAX_HEADER_LIST_SIZE: None,
|
|
}
|