493 lines
21 KiB
Python
493 lines
21 KiB
Python
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# based on https://github.com/ethay012/TCP-over-UDP
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import random
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import socket
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import pickle
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import threading
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import io
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import hashlib
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import simplecrypto
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from datetime import datetime
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DATA_DIVIDE_LENGTH = 8000
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PACKET_HEADER_SIZE = 512 # Pickle service info
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DATA_LENGTH = DATA_DIVIDE_LENGTH
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SENT_SIZE = PACKET_HEADER_SIZE + DATA_LENGTH + 272 # Encrypted data always 272 bytes bigger
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LAST_CONNECTION = -1
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FIRST = 0
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PACKET_END = b'___+++^^^END^^^+++___'
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# need for emulate
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AF_INET = None
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SOCK_STREAM = None
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class KeyPair:
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my_key = None
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peer_pub = None
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def __init__(self, sec):
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self.my_key = sec
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class TCPPacket(object):
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'''
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Add Documentation here
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'''
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SMALLEST_STARTING_SEQ = 0
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HIGHEST_STARTING_SEQ = 4294967295
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def __init__(self):
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# self.src_port = src_port # 16bit
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# self.dst_port = dst_port # 16bit
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self.seq = TCPPacket.gen_starting_seq_num() # 32bit
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self.ack = 0 # 32bit
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self.data_offset = 0 # 4 bits
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self.reserved_field = 0 # 3bits saved for future use must be zero assert self.reserved_field = 0
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#FLAGS
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self.flag_ns = 0 # 1bit
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self.flag_cwr = 0 # 1bit
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self.flag_ece = 0 # 1bit
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self.flag_urg = 0 # 1bit
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self.flag_ack = 0 # 1bit
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self.flag_psh = 0 # 1bit
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self.flag_rst = 0 # 1bit
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self.flag_syn = 0 # 1bit
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self.flag_fin = 0 # 1bit
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#window size
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self.window_size = 0 # 16bit
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#checksum
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self.checksum = 0 # 16bit
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#urgent pointer
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self.urgent_pointer = 0 # 16bit
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#options
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self.options = 0 # 0-320bits, divisible by 32
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#padding - TCP packet must be on a 32bit boundary this ensures that it is the padding is filled with 0's
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self.padding = 0 # as much as needed
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self.data = b''
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def __repr__(self):
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return 'TCPpacket()'
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def __str__(self):
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return 'SEQ Number: %d, ACK Number: %d, ACK:%d, SYN:%d, FIN:%d, TYPE:%s, DATA:%s' \
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% (self.seq, self.ack, self.flag_ack, self.flag_syn, self.flag_fin, self.packet_type(), self.data)
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def __cmp__(self, other):
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return (self.seq > other.seq) - (self.seq < other.seq)
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def packet_type(self):
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packet_type = ''
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if self.flag_syn == 1 and self.flag_ack == 1:
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packet_type = 'SYN-ACK'
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elif self.flag_ack == 1 and self.flag_fin == 1:
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packet_type = 'FIN-ACK'
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elif self.flag_syn == 1:
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packet_type = 'SYN'
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elif self.flag_ack == 1:
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packet_type = 'ACK'
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elif self.flag_fin == 1:
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packet_type = 'FIN'
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elif self.data != b'':
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packet_type = 'DATA'
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return packet_type
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def set_flags(self, ack=False, syn=False, fin=False):
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if ack:
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self.flag_ack = 1
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else:
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self.flag_ack = 0
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if syn:
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self.flag_syn = 1
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else:
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self.flag_syn = 0
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if fin:
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self.flag_fin = 1
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else:
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self.flag_fin = 0
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@staticmethod
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def gen_starting_seq_num():
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return random.randint(TCPPacket.SMALLEST_STARTING_SEQ, TCPPacket.HIGHEST_STARTING_SEQ)
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class RestrictedUnpickler(pickle.Unpickler):
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def find_class(self, module, name):
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# Only allow TCPPacket
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if module == "utcp" and name == 'TCPPacket':
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return TCPPacket
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# Forbid everything else.
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raise pickle.UnpicklingError("global '%s.%s' is forbidden" %
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(module, name))
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def restricted_pickle_loads(s):
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"""Helper function analogous to pickle.loads()."""
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return RestrictedUnpickler(io.BytesIO(s)).load()
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class ConnectedSOCK(object):
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def __init__(self, low_sock, client_addr):
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self.client_addr = client_addr
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self.low_sock = low_sock
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def __getattribute__(self, att):
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if not att.startswith('_') and not att in ['client_addr', 'low_sock', 'send', 'recv', 'close', 'closed']:
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if att in self.low_sock.__dict__:
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return getattr(self.low_sock, att)
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return object.__getattribute__(self, att)
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def send(self, data):
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if self.closed:
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raise EOFError
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self.low_sock.send(data, self.client_addr)
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def recv(self, size=None):
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if self.closed:
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raise EOFError
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if size:
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return self.low_sock.recv(self.client_addr)[:size]
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else:
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return self.low_sock.recv(self.client_addr)
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@property
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def closed(self):
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return self.low_sock.own_socket._closed or (self.client_addr not in self.low_sock.connections or self.low_sock.connections[self.client_addr].flag_fin)
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def close(self):
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self.low_sock.close(self.client_addr)
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class TCP(object):
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host = None
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port = None
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client = False
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def __init__(self, af_type=None, sock_type=None, encrypted=False):
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self.encrypted = encrypted
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self.incoming_packet_event = threading.Event()
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#seq will have the last packet send and ack will have the next packet waiting to receive
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self.own_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP socket used for communication.
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self.settimeout()
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self.peer_keypair = {}
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self.connections = {}
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self.connection_queue = []
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self.connection_lock = threading.Lock()
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self.queue_lock = threading.Lock()
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# each condition will have a dictionary of an address and it's corresponding packet.
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self.packets_received = {'SYN': {}, 'ACK': {}, 'SYN-ACK': {}, 'DATA or FIN': {}, 'FIN-ACK': {}}
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def get_free_port(self):
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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s.bind(('', 0))
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port = s.getsockname()[1]
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s.close()
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return port
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def setsockopt(self, *a, **kw):
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pass
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def settimeout(self, timeout=5):
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self.own_socket.settimeout(timeout)
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def __repr__(self):
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return 'TCP()'
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def __str__(self):
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return 'Connections: %s' \
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% str(self.connections)
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def getsockname(self):
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return (self.host, self.port)
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def bind(self, addr):
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self.host = addr[0]
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self.port = addr[1]
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self.own_socket.bind(addr)
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def send(self, data, connection=None):
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try:
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if connection not in list(self.connections.keys()):
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if connection is None:
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connection = list(self.connections.keys())[0]
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else:
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raise EOFError('Connection not in connected devices')
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data_parts = TCP.data_divider(data)
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for data_part in data_parts:
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data_not_received = True
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data_chunk = data_part if not self.encrypted else self.peer_keypair[connection].peer_pub.encrypt_raw(data_part)
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checksum_of_data = TCP.checksum(data_chunk)
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self.connections[connection].checksum = checksum_of_data
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self.connections[connection].data = data_chunk
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self.connections[connection].set_flags()
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packet_to_send = pickle.dumps(self.connections[connection])
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self.connections[connection].checksum = 0
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self.connections[connection].data = b''
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while data_not_received:
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data_not_received = False
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try:
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self.own_socket.sendto(packet_to_send, connection)
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answer = self.find_correct_packet('ACK', connection)
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except socket.timeout:
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#print('timeout')
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data_not_received = True
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self.connections[connection].seq += len(data_part)
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except socket.error as error:
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raise EOFError('Socket was closed before executing command. Error is: %s.' % error)
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def recv(self, connection=None):
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try:
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data = b''
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if connection not in list(self.connections.keys()):
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if connection is None:
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connection = list(self.connections.keys())[0]
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else:
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return 'Connection not in connected devices'
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while True and self.status:
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data_part = self.find_correct_packet('DATA or FIN', connection)
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if not self.status:
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# print('I am disconnectiong cause sock is dead')
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raise EOFError('Disconnected')
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if data_part.packet_type() == 'FIN':
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self.disconnect(connection)
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raise EOFError('Disconnected')
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checksum_value = TCP.checksum(data_part.data)
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while checksum_value != data_part.checksum:
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data_part = self.find_correct_packet('DATA or FIN', connection)
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checksum_value = TCP.checksum(data_part.data)
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data_chunk = data_part.data if not self.encrypted else self.peer_keypair[connection].my_key.decrypt_raw(data_part.data)
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if data_chunk != PACKET_END:
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data += data_chunk
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self.connections[connection].ack = data_part.seq + len(data_part.data)
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self.connections[connection].seq += 1 # syn flag is 1 byte
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self.connections[connection].set_flags(ack=True)
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self.connections[connection].data = b''
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packet_to_send = pickle.dumps(self.connections[connection])
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self.own_socket.sendto(packet_to_send, connection) # after receiving correct info sends ack
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self.connections[connection].set_flags()
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if data_chunk == PACKET_END:
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break
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return data
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except socket.error as error:
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raise EOFError('Socket was closed before executing command. Error is: %s.' % error)
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# conditions = ['SYN', 'SYN-ACK', 'ACK', 'FIN', 'FIN-ACK', 'DATA']
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def listen_handler(self, max_connections):
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try:
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while True and self.status:
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try:
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answer, address = self.find_correct_packet('SYN')
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with self.queue_lock:
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if len(self.connection_queue) < max_connections:
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if self.encrypted:
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try:
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peer_pub = answer.data
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self.peer_keypair[address] = KeyPair(simplecrypto.RsaKeypair()) # FIXME: for some reason slowly creates a key
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self.peer_keypair[address].peer_pub = simplecrypto.RsaPublicKey(peer_pub)
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except:
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self.peer_keypair.pop(address)
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raise socket.error('Init peer public key error')
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self.connection_queue.append((answer, address))
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else:
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self.own_socket.sendto('Connections full', address)
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except KeyError:
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continue
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except socket.error as error:
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raise EOFError('Something went wrong in listen_handler func! Error is: %s.' + str(error))
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def listen(self, max_connections=1):
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self.status = 1
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self.central_receive()
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try:
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t = threading.Thread(target=self.listen_handler, args=(max_connections,))
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t.daemon = True
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t.start()
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except Exception as error:
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raise EOFError('Something went wrong in listen func! Error is: %s.' % str(error))
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def accept(self):
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try:
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while True:
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if self.connection_queue:
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with self.queue_lock:
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answer, address = self.connection_queue.pop()
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self.connections[address] = TCPPacket()
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self.connections[address].ack = answer.seq + 1
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self.connections[address].seq += 1
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self.connections[address].set_flags(ack=True, syn=True)
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if self.encrypted:
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pubkey = self.peer_keypair[address].my_key.publickey.serialize()
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self.connections[address].data = self.peer_keypair[address].peer_pub.encrypt_raw(pubkey)
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self.connections[address].checksum = TCP.checksum(self.connections[address].data)
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packet_to_send = pickle.dumps(self.connections[address])
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if self.encrypted:
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self.connections[address].data = b''
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self.connections[address].checksum = 0
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#lock address, connections dictionary?
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packet_not_sent_correctly = True
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while packet_not_sent_correctly or answer is None:
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try:
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packet_not_sent_correctly = False
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self.own_socket.sendto(packet_to_send, address)
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answer = self.find_correct_packet('ACK', address)
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except socket.timeout:
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packet_not_sent_correctly = True
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self.connections[address].set_flags()
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self.connections[address].ack = answer.seq + 1
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return ConnectedSOCK(self, address), address
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except Exception as error:
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self.close(address)
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raise EOFError('Something went wrong in accept func: ' + str(error))
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def connect(self, server_address=('127.0.0.1', 10000)):
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try:
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self.bind(('', self.get_free_port()))
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self.status = 1
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self.client = True
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self.central_receive()
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self.connections[server_address] = TCPPacket()
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self.connections[server_address].set_flags(syn=True)
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if self.encrypted:
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self.peer_keypair[server_address] = KeyPair(simplecrypto.RsaKeypair()) # FIXME: but here it creates the key quickly
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pubkey = self.peer_keypair[server_address].my_key.publickey.serialize()
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pub_checksum = TCP.checksum(pubkey)
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self.connections[server_address].checksum = pub_checksum
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self.connections[server_address].data = pubkey
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first_packet_to_send = pickle.dumps(self.connections[server_address])
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self.connections[server_address].data = b''
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self.connections[server_address].checksum = 0
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self.own_socket.sendto(first_packet_to_send, list(self.connections.keys())[FIRST])
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self.connections[server_address].set_flags()
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answer = self.find_correct_packet('SYN-ACK', server_address)
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if type(answer) == str: # == 'Connections full':
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|
raise socket.error('Server cant receive any connections right now.')
|
||
|
|
if self.encrypted:
|
||
|
|
try:
|
||
|
|
peer_pub = self.peer_keypair[server_address].my_key.decrypt_raw(answer.data)
|
||
|
|
self.peer_keypair[server_address].peer_pub = simplecrypto.RsaPublicKey(peer_pub)
|
||
|
|
except:
|
||
|
|
raise socket.error('Decrypt peer public key error')
|
||
|
|
if not peer_pub or answer.checksum != TCP.checksum(answer.data):
|
||
|
|
raise socket.error('Invalid peer public key')
|
||
|
|
|
||
|
|
self.connections[server_address].ack = answer.seq + 1
|
||
|
|
self.connections[server_address].seq += 1
|
||
|
|
self.connections[server_address].set_flags(ack=True)
|
||
|
|
second_packet_to_send = pickle.dumps(self.connections[server_address])
|
||
|
|
self.own_socket.sendto(second_packet_to_send, list(self.connections.keys())[FIRST])
|
||
|
|
self.connections[server_address].set_flags()
|
||
|
|
|
||
|
|
except socket.error as error:
|
||
|
|
self.own_socket.close()
|
||
|
|
self.connections = {}
|
||
|
|
self.peer_keypair = {}
|
||
|
|
self.status = 0
|
||
|
|
raise EOFError('The socket was closed. Error:' + str(error))
|
||
|
|
def shutdown(self, *a, **kw):
|
||
|
|
self.own_socket.close()
|
||
|
|
self.status = 0
|
||
|
|
def fileno(self):
|
||
|
|
return self.own_socket.fileno()
|
||
|
|
@property
|
||
|
|
def closed(self):
|
||
|
|
return self.own_socket._closed
|
||
|
|
def close(self, connection=None):
|
||
|
|
try:
|
||
|
|
if connection not in list(self.connections.keys()):
|
||
|
|
if connection is None:
|
||
|
|
connection = list(self.connections.keys())[0]
|
||
|
|
else:
|
||
|
|
raise EOFError('Connection not in connected devices')
|
||
|
|
self.connections[connection].set_flags(fin=True)
|
||
|
|
self.connections[connection].seq += 1
|
||
|
|
packet_to_send = pickle.dumps(self.connections[connection])
|
||
|
|
self.own_socket.sendto(packet_to_send, connection)
|
||
|
|
answer = self.find_correct_packet('ACK', connection) # change cause may get a None value
|
||
|
|
self.connections[connection].ack += 1
|
||
|
|
answer = self.find_correct_packet('FIN-ACK', connection)
|
||
|
|
if answer.flag_fin != 1:
|
||
|
|
raise Exception('The receiver didn\'t send the fin packet')
|
||
|
|
else:
|
||
|
|
self.connections[connection].ack += 1
|
||
|
|
self.connections[connection].seq += 1
|
||
|
|
self.connections[connection].set_flags(ack=True)
|
||
|
|
packet_to_send = pickle.dumps(self.connections[connection])
|
||
|
|
self.own_socket.sendto(packet_to_send, connection)
|
||
|
|
with self.connection_lock:
|
||
|
|
if len(self.connections):
|
||
|
|
self.connections.pop(connection)
|
||
|
|
if len(self.peer_keypair):
|
||
|
|
self.peer_keypair.pop(connection)
|
||
|
|
#if len(self.connections) == 0 and self.client:
|
||
|
|
# self.own_socket.close()
|
||
|
|
# self.status = 0
|
||
|
|
except Exception as error:
|
||
|
|
raise EOFError('Something went wrong in the close func! Error is: %s.' % error)
|
||
|
|
|
||
|
|
def disconnect(self, connection):
|
||
|
|
try:
|
||
|
|
self.connections[connection].ack += 1
|
||
|
|
self.connections[connection].seq += 1
|
||
|
|
self.connections[connection].set_flags(ack=True)
|
||
|
|
packet_to_send = pickle.dumps(self.connections[connection])
|
||
|
|
self.own_socket.sendto(packet_to_send, connection)
|
||
|
|
self.connections[connection].set_flags(fin=True, ack=True)
|
||
|
|
self.connections[connection].seq += 1
|
||
|
|
packet_to_send = pickle.dumps(self.connections[connection])
|
||
|
|
self.own_socket.sendto(packet_to_send, connection)
|
||
|
|
answer = self.find_correct_packet('ACK', connection)
|
||
|
|
with self.connection_lock:
|
||
|
|
self.connections.pop(connection)
|
||
|
|
except Exception as error:
|
||
|
|
raise EOFError('Something went wrong in disconnect func:%s ' % error)
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def data_divider(data):
|
||
|
|
'''Divides the data into a list where each element's length is 1024'''
|
||
|
|
data = [data[i:i + DATA_DIVIDE_LENGTH] for i in range(0, len(data), DATA_DIVIDE_LENGTH)]
|
||
|
|
data.append(PACKET_END)
|
||
|
|
return data
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def checksum(source_bytes):
|
||
|
|
return hashlib.sha1(source_bytes).digest()
|
||
|
|
|
||
|
|
def find_correct_packet(self, condition, address=('Any',)):
|
||
|
|
not_found = True
|
||
|
|
tries = 0
|
||
|
|
while not_found and tries < 2 and self.status:
|
||
|
|
try:
|
||
|
|
not_found = False
|
||
|
|
if address[0] == 'Any':
|
||
|
|
order = self.packets_received[condition].popitem() # to reverse the tuple received
|
||
|
|
return order[1], order[0]
|
||
|
|
if condition == 'ACK':
|
||
|
|
tries += 1
|
||
|
|
if condition == 'DATA or FIN':
|
||
|
|
packet = self.packets_received[condition][address].pop()
|
||
|
|
if not len(self.packets_received[condition][address]):
|
||
|
|
del self.packets_received[condition][address]
|
||
|
|
else:
|
||
|
|
packet = self.packets_received[condition].pop(address)
|
||
|
|
return packet
|
||
|
|
except KeyError:
|
||
|
|
not_found = True
|
||
|
|
self.incoming_packet_event.wait(0.1)
|
||
|
|
def blink_event(self):
|
||
|
|
self.incoming_packet_event.set()
|
||
|
|
self.incoming_packet_event.clear()
|
||
|
|
def sort_answers(self, packet, address):
|
||
|
|
if packet.packet_type() == 'DATA' or packet.packet_type() == 'FIN':
|
||
|
|
if address not in self.packets_received['DATA or FIN']:
|
||
|
|
self.packets_received['DATA or FIN'][address] = []
|
||
|
|
self.packets_received['DATA or FIN'][address].insert(0, packet)
|
||
|
|
self.blink_event()
|
||
|
|
elif packet.packet_type() == '':
|
||
|
|
#print('redundant packet found', packet)
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
self.packets_received[packet.packet_type()][address] = packet
|
||
|
|
self.blink_event()
|
||
|
|
|
||
|
|
def central_receive_handler(self):
|
||
|
|
while True and self.status:
|
||
|
|
try:
|
||
|
|
packet, address = self.own_socket.recvfrom(SENT_SIZE)
|
||
|
|
packet = restricted_pickle_loads(packet)
|
||
|
|
self.sort_answers(packet, address)
|
||
|
|
except socket.timeout:
|
||
|
|
continue
|
||
|
|
except socket.error as error:
|
||
|
|
self.own_socket.close()
|
||
|
|
self.status = 0
|
||
|
|
# print('An error has occured: Socket error %s' % error)
|
||
|
|
|
||
|
|
def central_receive(self):
|
||
|
|
t = threading.Thread(target=self.central_receive_handler)
|
||
|
|
t.daemon = True
|
||
|
|
t.start()
|