191 lines
7.0 KiB
Python
191 lines
7.0 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(" ".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 TL:
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def __init__(self):
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with open("TL_schema.JSON", 'r') as f:
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TL_dict = json.load(f)
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self.methods = TL_dict['methods']
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self.constructors = TL_dict['constructors']
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self.func_dict_id = {}
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self.func_dict_name = {}
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self.obj_dict_id = {}
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self.obj_dict_name = {}
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# Read constructors
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for elem in self.constructors:
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z = TlElement(elem)
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self.func_dict_id = {}
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def serialize(self, type_, data):
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# 1. Type constructor ID
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# 2. type costructor params
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# Bare types
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if type_ == 'string':
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assert isinstance(data, str)
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struct.pack("<L", len(data))
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if type_ == 'int':
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assert isinstance(data, str)
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struct.pack("<L", len(data))
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def deserialize(self, byte_string, type_=None, subtype=None):
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if isinstance(byte_string, io.BytesIO):
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bytes_io = byte_string
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elif isinstance(byte_string, bytes):
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bytes_io = io.BytesIO(byte_string)
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else:
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raise TypeError("Bad input type, use bytes string or BytesIO object")
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# Built-in bare types
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if type_ == 'int':
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x = struct.unpack('<i', bytes_io.read(4))[0]
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elif type_ == '#':
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x = struct.unpack('<I', bytes_io.read(4))[0]
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elif type_ == 'long':
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x = struct.unpack('<q', bytes_io.read(8))[0]
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elif type_ == 'double':
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x = struct.unpack('<d', bytes_io.read(8))[0]
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elif type_ == 'int128':
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t = struct.unpack('<16s', bytes_io.read(16))[0]
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x = int.from_bytes(t, 'little')
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elif type_ == 'int256':
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t = struct.unpack('<32s', bytes_io.read(32))[0]
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x = int.from_bytes(t, 'little')
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elif type_ == 'bytes':
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l = int.from_bytes(bytes_io.read(1), 'little')
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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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elif type_ == 'string':
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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 = [self.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 = self.obj_dict_id[i]
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except:
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raise Exception("Could not extract type: %s" % type_)
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base_boxed_types = ["Vector", "Int", "Long", "Double", "String", "Int128", "Int256"]
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if tl_elem.result in base_boxed_types:
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x = self.deserialize(bytes_io, type_=tl_elem.name, subtype=subtype)
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else: # other types
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x = {}
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for arg in tl_elem.args:
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x[arg['name']] = self.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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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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