244 lines
9.1 KiB
Python
244 lines
9.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Created on Tue Sep 2 19:26:15 2014
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@author: agrigoryev
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"""
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from binascii import crc32
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from datetime import datetime
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import io
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import json
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import socket
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import struct
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def vis(bs):
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"""
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Function to visualize byte streams. Split into bytes, print to console.
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:param bs: BYTE STRING
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"""
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symbols_in_one_line = 8
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n = len(bs) // symbols_in_one_line
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for i in range(n):
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print(str(i*symbols_in_one_line)+" | "+" ".join(["%02X" % b for b in bs[i*symbols_in_one_line:(i+1)*symbols_in_one_line]])) # for every 8 symbols line
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print(" ".join(["%02X" % b for b in bs[(i+1)*symbols_in_one_line:]])+"\n") # for last line
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class TlConstructor:
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def __init__(self, json_dict):
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self.id = int(json_dict['id'])
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self.type = json_dict['type']
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self.predicate = json_dict['predicate']
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self.params = []
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# case of vector
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for param in json_dict['params']:
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if param['type'] == "Vector<long>":
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param['type'] = "Vector t"
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param['subtype'] = "long"
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else:
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param['subtype'] = None
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self.params.append(param)
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class TlMethod:
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def __init__(self, json_dict):
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self.id = int(json_dict['id'])
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self.type = json_dict['type']
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self.method = json_dict['method']
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self.params = json_dict['params']
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class TL:
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def __init__(self, filename):
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with open(filename, 'r') as f:
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TL_dict = json.load(f)
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# Read constructors
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self.constructors = TL_dict['constructors']
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self.constructor_id = {}
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self.constructor_type = {}
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for elem in self.constructors:
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z = TlConstructor(elem)
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self.constructor_id[z.id] = z
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self.constructor_type[z.predicate] = z
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self.methods = TL_dict['methods']
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self.method_id = {}
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self.method_name = {}
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for elem in self.methods:
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z = TlMethod(elem)
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self.method_id[z.id] = z
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self.method_name[z.method] = z
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## Loading TL_schema
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tl = TL("TL_schema.JSON")
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def serialize_obj(bytes_io, type_, **kwargs):
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try:
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tl_constructor = tl.constructor_type[type_]
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except KeyError:
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raise Exception("Could not extract type: %s" % type_)
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bytes_io.write(struct.pack('<i', tl_constructor.id))
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for arg in tl_constructor.params:
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serialize_param(bytes_io, type_=arg['type'], value=kwargs[arg['name']])
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def serialize_method(bytes_io, type_, **kwargs):
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try:
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tl_method = tl.method_name[type_]
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except KeyError:
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raise Exception("Could not extract type: %s" % type_)
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bytes_io.write(struct.pack('<i', tl_method.id))
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for arg in tl_method.params:
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serialize_param(bytes_io, type_=arg['type'], value=kwargs[arg['name']])
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def serialize_param(bytes_io, type_, value):
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if type_ == "int":
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assert isinstance(value, int)
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bytes_io.write(struct.pack('<i', value))
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elif type_ == "long":
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assert isinstance(value, int)
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bytes_io.write(struct.pack('<q', value))
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elif type_ in ["int128", "int256"]:
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assert isinstance(value, bytes)
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bytes_io.write(value)
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elif type_ == 'string' or 'bytes':
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l = len(value)
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if l < 254: # short string format
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bytes_io.write(int.to_bytes(l, 1, 'little')) # 1 byte of string
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bytes_io.write(value) # string
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bytes_io.write(b'\x00'*((-l-1) % 4)) # padding bytes
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else:
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bytes_io.write(b'\xfe') # byte 254
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bytes_io.write(int.to_bytes(l, 3, 'little')) # 3 bytes of string
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bytes_io.write(value) # string
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bytes_io.write(b'\x00'*(-l % 4)) # padding bytes
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def deserialize(bytes_io, type_=None, subtype=None):
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"""
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:type bytes_io: io.BytesIO object
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"""
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assert isinstance(bytes_io, io.BytesIO)
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# Built-in bare types
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if type_ == 'int': x = struct.unpack('<i', bytes_io.read(4))[0]
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elif type_ == '#': x = struct.unpack('<I', bytes_io.read(4))[0]
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elif type_ == 'long': x = struct.unpack('<q', bytes_io.read(8))[0]
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elif type_ == 'double': x = struct.unpack('<d', bytes_io.read(8))[0]
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elif type_ == 'int128': x = bytes_io.read(16)
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elif type_ == 'int256': x = bytes_io.read(32)
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elif type_ == 'string' or type_ == 'bytes':
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l = int.from_bytes(bytes_io.read(1), 'little')
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assert l <= 254
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if l == 254:
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# We have a long string
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long_len = int.from_bytes(bytes_io.read(3), 'little')
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x = bytes_io.read(long_len)
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bytes_io.read(-long_len % 4) # skip padding bytes
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else:
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# We have a short string
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x = bytes_io.read(l)
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bytes_io.read(-(l+1) % 4) # skip padding bytes
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assert isinstance(x, bytes)
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elif type_ == 'vector':
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assert subtype is not None
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count = int.from_bytes(bytes_io.read(4), 'little')
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x = [deserialize(bytes_io, type_=subtype) for i in range(count)]
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else:
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# Boxed types
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i = struct.unpack('<i', bytes_io.read(4))[0] # read type ID
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try:
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tl_elem = tl.constructor_id[i]
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except KeyError:
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raise Exception("Could not extract type: %s" % type_)
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base_boxed_types = ["Vector t", "Int", "Long", "Double", "String", "Int128", "Int256"]
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if tl_elem.type in base_boxed_types:
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x = deserialize(bytes_io, type_=tl_elem.predicate, subtype=subtype)
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else: # other types
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x = {}
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for arg in tl_elem.params:
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x[arg['name']] = deserialize(bytes_io, type_=arg['type'], subtype=arg['subtype'])
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return x
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class Session:
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""" Manages TCP Transport. encryption and message frames """
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def __init__(self, ip, port):
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# creating socket
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self.sock = socket.socket()
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self.sock.connect((ip, port))
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self.auth_key_id = None
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self.number = 0
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def __del__(self):
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# closing socket when session object is deleted
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self.sock.close()
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@staticmethod
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def header_unencrypted(message):
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"""
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Creating header for the unencrypted message:
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:param message: byte string to send
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"""
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# Basic instructions: https://core.telegram.org/mtproto/description#unencrypted-message
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# Message id: https://core.telegram.org/mtproto/description#message-identifier-msg-id
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msg_id = int(datetime.utcnow().timestamp()*2**30)*4
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return (b'\x00\x00\x00\x00\x00\x00\x00\x00' +
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struct.pack('<Q', msg_id) +
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struct.pack('<L', len(message)))
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# TCP Transport
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# Instructions may be found here: https://core.telegram.org/mtproto#tcp-transport
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# If a payload (packet) needs to be transmitted from server to client or from client to server,
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# it is encapsulated as follows: 4 length bytes are added at the front (to include the length,
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# the sequence number, and CRC32; always divisible by 4) and 4 bytes with the packet sequence number
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# within this TCP connection (the first packet sent is numbered 0, the next one 1, etc.),
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# and 4 CRC32 bytes at the end (length, sequence number, and payload together).
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def send_message(self, message):
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"""
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Forming the message frame and sending message to server
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:param message: byte string to send
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"""
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print('>>')
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vis(message) # Sending message visualisation to console
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data = self.header_unencrypted(message) + message
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step1 = struct.pack('<LL', len(data)+12, self.number) + data
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step2 = step1 + struct.pack('<L', crc32(step1))
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self.sock.send(step2)
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self.number += 1
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def recv_message(self):
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"""
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Reading socket and receiving message from server. Check the CRC32 and
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"""
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packet_length_data = self.sock.recv(4) # reads how many bytes to read
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if len(packet_length_data) > 0: # if we have smth. in the socket
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packet_length = struct.unpack("<L", packet_length_data)[0]
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packet = self.sock.recv(packet_length - 4) # read the rest of bytes from socket
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(self.number, auth_key_id, message_id, message_length)= struct.unpack("<L8s8sI", packet[0:24])
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data = packet[24:24+message_length]
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crc = packet[-4:]
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# Checking the CRC32 correctness of received data
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if crc32(packet_length_data + packet[0:-4]).to_bytes(4, 'little') == crc:
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print('<<')
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vis(data) # Received message visualisation to console
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return data
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def method_call(self, method, **kwargs):
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z=io.BytesIO()
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serialize_method(z, method, **kwargs)
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self.send_message(z.getvalue())
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server_answer = self.recv_message()
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if server_answer is not None:
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return deserialize(io.BytesIO(server_answer))
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else:
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raise Exception("Server not answered") |