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conversion.py
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from struct import pack, unpack_from
from socket import inet_ntoa, inet_aton, error as socket_error
from libtorrent import bdecode
from Tribler.dispersy.conversion import BinaryConversion
from Tribler.dispersy.message import DropPacket
from Tribler.dispersy.endpoint import TUNNEL_PREFIX, TUNNEL_PREFIX_LENGHT
ADDRESS_TYPE_IPV4 = 0x01
ADDRESS_TYPE_DOMAIN_NAME = 0x02
class TunnelConversion(BinaryConversion):
def __init__(self, community):
super(TunnelConversion, self).__init__(community, "\x02")
self.define_meta_message(chr(1),
community.get_meta_message(u"cell"),
self._encode_cell,
self._decode_cell)
self.define_meta_message(chr(2),
community.get_meta_message(u"create"),
self._encode_create,
self._decode_create)
self.define_meta_message(chr(3),
community.get_meta_message(u"created"),
self._encode_created,
self._decode_created)
self.define_meta_message(chr(4),
community.get_meta_message(u"extend"),
self._encode_extend,
self._decode_extend)
self.define_meta_message(chr(5),
community.get_meta_message(u"extended"),
self._encode_extended,
self._decode_extended)
self.define_meta_message(chr(6),
community.get_meta_message(u"ping"),
self._encode_ping,
self._decode_ping)
self.define_meta_message(chr(7),
community.get_meta_message(u"pong"),
self._encode_pong,
self._decode_pong)
self.define_meta_message(chr(8),
community.get_meta_message(u"stats-request"),
self._encode_stats_request, self._decode_stats_request)
self.define_meta_message(chr(9),
community.get_meta_message(u"stats-response"),
self._encode_stats_response,
self._decode_stats_response)
self.define_meta_message(chr(10),
community.get_meta_message(u"destroy"),
self._encode_destroy, self._decode_destroy)
self.define_meta_message(chr(11),
community.get_meta_message(u"establish-intro"),
self._encode_establish_intro,
self._decode_establish_intro)
self.define_meta_message(chr(12),
community.get_meta_message(u"intro-established"),
self._encode_intro_established,
self._decode_intro_established)
self.define_meta_message(chr(13),
community.get_meta_message(u"key-request"),
self._encode_keys_request,
self._decode_keys_request)
self.define_meta_message(chr(14),
community.get_meta_message(u"key-response"),
self._encode_keys_response,
self._decode_keys_response)
self.define_meta_message(chr(15),
community.get_meta_message(u"establish-rendezvous"),
self._encode_establish_rendezvous,
self._decode_establish_rendezvous)
self.define_meta_message(chr(16),
community.get_meta_message(u"rendezvous-established"),
self._encode_rendezvous_established,
self._decode_rendezvous_established)
self.define_meta_message(chr(17),
community.get_meta_message(u"create-e2e"),
self._encode_create_e2e,
self._decode_create_e2e)
self.define_meta_message(chr(18),
community.get_meta_message(u"created-e2e"),
self._encode_created_e2e,
self._decode_created_e2e)
self.define_meta_message(chr(19),
community.get_meta_message(u"link-e2e"),
self._encode_link_e2e,
self._decode_link_e2e)
self.define_meta_message(chr(20),
community.get_meta_message(u"linked-e2e"),
self._encode_linked_e2e,
self._decode_linked_e2e)
self.define_meta_message(chr(21),
community.get_meta_message(u"dht-request"),
self._encode_dht_request,
self._decode_dht_request)
self.define_meta_message(chr(22),
community.get_meta_message(u"dht-response"),
self._encode_dht_response,
self._decode_dht_response)
def _encode_introduction_response(self, message):
payload = message.payload
data = [pack("!?", payload.exitnode,)]
data += list(super(TunnelConversion, self)._encode_introduction_response(message))
return tuple(data)
def _decode_introduction_response(self, placeholder, offset, data):
exitnode, = unpack_from('!?', data, offset)
offset += 1
offset, payload = super(TunnelConversion, self)._decode_introduction_response(placeholder, offset, data)
payload._exitnode = exitnode
return (offset, payload)
def _encode_introduction_request(self, message):
payload = message.payload
data = [pack("!?", payload.exitnode,)]
data += super(TunnelConversion, self)._encode_introduction_request(message)
return data
def _decode_introduction_request(self, placeholder, offset, data):
exitnode, = unpack_from('!?', data, offset)
offset += 1
offset, payload = super(TunnelConversion, self)._decode_introduction_request(placeholder, offset, data)
payload._exitnode = exitnode
return (offset, payload)
def _encode_cell(self, message):
payload = message.payload
packet = pack("!IB", payload.circuit_id, self._encode_message_map[
payload.message_type].byte) + payload.encrypted_message
return packet,
def _decode_cell(self, placeholder, offset, data):
circuit_id, = unpack_from('!I', data, offset)
offset += 4
if not data[offset] in self._decode_message_map:
raise DropPacket("Invalid message")
message_type = self._decode_message_map[data[offset]].meta.name
offset += 1
encrypted_message = data[offset:]
offset += len(encrypted_message)
return offset, placeholder.meta.payload.implement(circuit_id, message_type, encrypted_message)
def _encode_create(self, message):
payload = message.payload
packet = pack("!IHH20s", payload.circuit_id, len(payload.node_public_key),
len(payload.key), payload.node_id) + payload.node_public_key + payload.key
return packet,
def _decode_create(self, placeholder, offset, data):
circuit_id, len_pubic_key, len_key, nodeid = unpack_from('!IHH20s', data, offset)
offset += 28
node_public_key = data[offset: offset + len_pubic_key]
offset += len_pubic_key
key = data[offset:offset + len_key]
offset += len_key
return offset, placeholder.meta.payload.implement(circuit_id, nodeid, node_public_key, key)
def _encode_created(self, message):
payload = message.payload
packet = pack("!IH32s", payload.circuit_id, len(payload.key), payload.auth) + \
payload.key + payload.candidate_list
return packet,
def _decode_created(self, placeholder, offset, data):
circuit_id, len_key, auth = unpack_from('!IH32s', data, offset)
offset += 38
key = data[offset:offset + len_key]
offset += len_key
candidate_list = data[offset:]
offset += len(candidate_list)
return offset, placeholder.meta.payload.implement(circuit_id, key, auth, candidate_list)
def _encode_extend(self, message):
payload = message.payload
packet = pack("!IHH20s", payload.circuit_id, len(payload.node_public_key), len(payload.key),
payload.node_id) + payload.node_public_key + payload.key
if message.payload.node_addr:
host, port = message.payload.node_addr
packet += pack("!4sH", inet_aton(host), port)
return packet,
def _decode_extend(self, placeholder, offset, data):
circuit_id, len_public_key, len_key, nodeid = unpack_from('!IHH20s', data, offset)
offset += 28
node_public_key = data[offset:offset + len_public_key]
offset += len_public_key
key = data[offset:offset + len_key]
offset += len_key
node_addr = None
if len(data) > offset:
host, port = unpack_from('!4sH', data, offset)
offset += 6
node_addr = (inet_ntoa(host), port)
return offset, placeholder.meta.payload.implement(circuit_id, nodeid, node_public_key, node_addr, key)
def _encode_extended(self, message):
payload = message.payload
return pack("!IH32s", payload.circuit_id, len(payload.key), payload.auth) + \
payload.key + payload.candidate_list,
def _decode_extended(self, placeholder, offset, data):
circuit_id, len_key, auth = unpack_from('!IH32s', data, offset)
offset += 38
key = data[offset:offset + len_key]
offset += len_key
candidate_list = data[offset:]
offset += len(candidate_list)
return offset, placeholder.meta.payload.implement(circuit_id, key, auth, candidate_list)
def _encode_ping(self, message):
return pack('!IH', message.payload.circuit_id, message.payload.identifier),
def _decode_ping(self, placeholder, offset, data):
if len(data) < offset + 6:
raise DropPacket("Insufficient packet size")
circuit_id, identifier = unpack_from('!IH', data, offset)
offset += 6
return offset, placeholder.meta.payload.implement(circuit_id, identifier)
def _encode_pong(self, message):
return self._encode_ping(message)
def _decode_pong(self, placeholder, offset, data):
return self._decode_ping(placeholder, offset, data)
def _encode_destroy(self, message):
return pack('!IH', message.payload.circuit_id, message.payload.reason),
def _decode_destroy(self, placeholder, offset, data):
if len(data) < offset + 6:
raise DropPacket("Insufficient packet size")
circuit_id, reason = unpack_from('!IB', data, offset)
offset += 6
return offset, placeholder.meta.payload.implement(circuit_id, reason)
def _encode_stats_request(self, message):
return pack('!H', message.payload.identifier),
def _decode_stats_request(self, placeholder, offset, data):
identifier, = unpack_from('!H', data, offset)
offset += 2
return offset, placeholder.meta.payload.implement(identifier)
def _encode_stats_response(self, message):
stats_list = []
for key in ['uptime', 'bytes_up', 'bytes_down', 'bytes_relay_up', 'bytes_relay_down',
'bytes_enter', 'bytes_exit']:
stats_list.append(message.payload.stats.get(key, 0))
return pack('!HIQQQQQQ', *([message.payload.identifier] + stats_list)),
def _decode_stats_response(self, placeholder, offset, data):
identifier, = unpack_from('!H', data, offset)
offset += 2
stats_list = unpack_from('!IQQQQQQ', data, offset)
offset += 52
stats_dict = dict(
zip(['uptime', 'bytes_up', 'bytes_down', 'bytes_relay_up', 'bytes_relay_down',
'bytes_enter', 'bytes_exit'], stats_list))
# Ignore the rest
offset += len(data[offset:])
return offset, placeholder.meta.payload.implement(identifier, stats_dict)
def _encode_establish_intro(self, message):
return pack('!IH20s', message.payload.circuit_id, message.payload.identifier, message.payload.info_hash),
def _decode_establish_intro(self, placeholder, offset, data):
circuit_id, identifier, info_hash = unpack_from('!IH20s', data, offset)
offset += 26
return offset, placeholder.meta.payload.implement(circuit_id, identifier, info_hash)
def _encode_intro_established(self, message):
return pack('!IH', message.payload.circuit_id, message.payload.identifier),
def _decode_intro_established(self, placeholder, offset, data):
circuit_id, identifier = unpack_from('!IH', data, offset)
offset += 6
return offset, placeholder.meta.payload.implement(circuit_id, identifier)
def _encode_establish_rendezvous(self, message):
return pack('!IH20s', message.payload.circuit_id, message.payload.identifier, message.payload.cookie),
def _decode_establish_rendezvous(self, placeholder, offset, data):
circuit_id, identifier, cookie = unpack_from('!IH20s', data, offset)
offset += 26
return offset, placeholder.meta.payload.implement(circuit_id, identifier, cookie)
def _encode_rendezvous_established(self, message):
host, port = message.payload.rendezvous_point_addr
return pack('!IH4sH', message.payload.circuit_id, message.payload.identifier, inet_aton(host), port),
def _decode_rendezvous_established(self, placeholder, offset, data):
circuit_id, identifier = unpack_from('!IH', data, offset)
offset += 6
host, port = unpack_from('!4sH', data, offset)
rendezvous_point_addr = (inet_ntoa(host), port)
offset += 6
return offset, placeholder.meta.payload.implement(circuit_id, identifier, rendezvous_point_addr)
def _encode_keys_request(self, message):
return pack('!H20s', message.payload.identifier, message.payload.info_hash),
def _decode_keys_request(self, placeholder, offset, data):
identifier, info_hash = unpack_from('!H20s', data, offset)
offset += 22
return offset, placeholder.meta.payload.implement(identifier, info_hash)
def _encode_keys_response(self, message):
return pack('!HH', message.payload.identifier, len(message.payload.public_key)) \
+ message.payload.public_key + message.payload.pex_peers,
def _decode_keys_response(self, placeholder, offset, data):
identifier, len_public_key = unpack_from('!HH', data, offset)
offset += 4
public_key = data[offset: offset + len_public_key]
offset += len_public_key
pex_peers = data[offset:]
offset += len(pex_peers)
return offset, placeholder.meta.payload.implement(identifier, public_key, pex_peers)
def _encode_create_e2e(self, message):
payload = message.payload
packet = pack("!H20sHH20s", payload.identifier, payload.info_hash, len(payload.node_public_key),
len(payload.key), payload.node_id) + payload.node_public_key + payload.key
return packet,
def _decode_create_e2e(self, placeholder, offset, data):
identifier, info_hash, len_pubic_key, len_key, nodeid = unpack_from('!H20sHH20s', data, offset)
offset += 46
node_public_key = data[offset: offset + len_pubic_key]
offset += len_pubic_key
key = data[offset:offset + len_key]
offset += len_key
return offset, placeholder.meta.payload.implement(identifier, info_hash, nodeid, node_public_key, key)
def _encode_created_e2e(self, message):
payload = message.payload
return pack("!HH32s", payload.identifier, len(payload.key), payload.auth) + payload.key + payload.rp_sock_addr,
def _decode_created_e2e(self, placeholder, offset, data):
identifier, len_key, auth = unpack_from('!HH32s', data, offset)
offset += 36
key = data[offset:offset + len_key]
offset += len_key
rp_sock_addr = data[offset:]
offset += len(rp_sock_addr)
return offset, placeholder.meta.payload.implement(identifier, key, auth, rp_sock_addr)
def _encode_link_e2e(self, message):
payload = message.payload
return pack("!IH20s", payload.circuit_id, payload.identifier, payload.cookie),
def _decode_link_e2e(self, placeholder, offset, data):
circuit_id, identifier, cookie = unpack_from('!IH20s', data, offset)
offset += 26
return offset, placeholder.meta.payload.implement(circuit_id, identifier, cookie)
def _encode_linked_e2e(self, message):
payload = message.payload
return pack("!IH", payload.circuit_id, payload.identifier),
def _decode_linked_e2e(self, placeholder, offset, data):
circuit_id, identifier = unpack_from('!IH', data, offset)
offset += 6
return offset, placeholder.meta.payload.implement(circuit_id, identifier)
def _encode_dht_request(self, message):
return pack('!IH20s',
message.payload.circuit_id,
message.payload.identifier,
message.payload.info_hash),
def _decode_dht_request(self, placeholder, offset, data):
circuit_id, identifier, info_hash = unpack_from('!IH20s', data, offset)
offset += 26
return offset, placeholder.meta.payload.implement(circuit_id, identifier, info_hash)
def _encode_dht_response(self, message):
return pack('!IH20s',
message.payload.circuit_id,
message.payload.identifier,
message.payload.info_hash) + message.payload.peers,
def _decode_dht_response(self, placeholder, offset, data):
circuit_id, identifier, info_hash = unpack_from('!IH20s', data, offset)
offset += 26
peers = data[offset:]
offset += len(peers)
return offset, placeholder.meta.payload.implement(circuit_id, identifier, info_hash, peers)
@staticmethod
def swap_circuit_id(packet, message_type, old_circuit_id, new_circuit_id):
circuit_id_pos = 0 if message_type == u"data" else 31
circuit_id, = unpack_from('!I', packet, circuit_id_pos)
assert circuit_id == old_circuit_id, circuit_id
packet = packet[:circuit_id_pos] + pack('!I', new_circuit_id) + packet[circuit_id_pos + 4:]
return packet
@staticmethod
def get_circuit_id(packet, message_type):
circuit_id_pos = 0 if message_type == u"data" else 31
circuit_id, = unpack_from('!I', packet, circuit_id_pos)
return circuit_id
@staticmethod
def split_encrypted_packet(packet, message_type):
encryped_pos = 4 if message_type == u"data" else 36
return packet[:encryped_pos], packet[encryped_pos:]
@staticmethod
def encode_data(circuit_id, dest_address, org_address, data):
assert org_address
def encode_address(host, port):
try:
ip = inet_aton(host)
is_ip = True
except socket_error:
is_ip = False
if is_ip:
return pack("!B4sH", ADDRESS_TYPE_IPV4, ip, port)
else:
return pack("!BH", ADDRESS_TYPE_DOMAIN_NAME, len(host)) + host + pack("!H", port)
return pack("!I", circuit_id) + encode_address(*dest_address) + encode_address(*org_address) + data
@staticmethod
def decode_data(packet):
circuit_id, = unpack_from("!I", packet)
offset = 4
def decode_address(packet, offset):
addr_type, = unpack_from("!B", packet, offset)
offset += 1
if addr_type == ADDRESS_TYPE_IPV4:
host, port = unpack_from('!4sH', packet, offset)
offset += 6
return (inet_ntoa(host), port), offset
elif addr_type == ADDRESS_TYPE_DOMAIN_NAME:
length, = unpack_from('!H', packet, offset)
offset += 2
host = packet[offset:offset + length]
offset += length
port, = unpack_from('!H', packet, offset)
offset += 2
return (host, port), offset
return None, offset
dest_address, offset = decode_address(packet, offset)
org_address, offset = decode_address(packet, offset)
data = packet[offset:]
return circuit_id, dest_address, org_address, data
@staticmethod
def convert_from_cell(packet):
header = packet[:22] + packet[35] + packet[23:31]
return header + packet[31:35] + packet[36:]
@staticmethod
def convert_to_cell(packet):
header = packet[:22] + '\x01' + packet[23:31]
return header + packet[31:35] + packet[22] + packet[35:]
@staticmethod
def could_be_utp(data):
if len(data) < 20:
return False
byte1, byte2 = unpack_from('!BB', data)
# Type should be 0..4, Ver should be 1
if not (0 <= (byte1 >> 4) <= 4 and (byte1 & 15) == 1):
return False
# Extension should be 0..2
if not (0 <= byte2 <= 2):
return False
return True
@staticmethod
def could_be_udp_tracker(data):
# For the UDP tracker protocol the action field is either at position 0 or 8, and should be 0..3
if len(data) >= 8 and (0 <= unpack_from('!I', data, 0)[0] <= 3) or \
len(data) >= 12 and (0 <= unpack_from('!I', data, 8)[0] <= 3):
return True
return False
@staticmethod
def could_be_dht(data):
try:
decoded = bdecode(data)
if isinstance(decoded, dict) and decoded.get('y') in ['q', 'r', 'e']:
return True
except:
pass
return False
@staticmethod
def could_be_dispersy(data):
return data[:TUNNEL_PREFIX_LENGHT] == TUNNEL_PREFIX and len(data) >= (23 + TUNNEL_PREFIX_LENGHT)
@staticmethod
def is_allowed(data):
return (TunnelConversion.could_be_utp(data) or
TunnelConversion.could_be_udp_tracker(data) or
TunnelConversion.could_be_dht(data) or
TunnelConversion.could_be_dispersy(data))