def _handle_server_dns_resolved(self, error, remote_addr, server_addr, params):
if error:
return
data, r_addr, uid, header_length = params
user_id = self._listen_port
try:
server_port = remote_addr[1]
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs: # drop
return
af, socktype, proto, canonname, sa = addrs[0]
server_addr = sa[0]
key = client_key(r_addr, af)
client_pair = self._cache.get(key, None)
if client_pair is None:
client_pair = self._cache_dns_client.get(key, None)
if client_pair is None:
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' % common.to_str(sa[0]))
# drop
return
if self._forbidden_portset:
if sa[1] in self._forbidden_portset:
logging.debug('Port %d is in forbidden list, reject' % sa[1])
# drop
return
client = socket.socket(af, socktype, proto)
client_uid = uid
client.setblocking(False)
self._socket_bind_addr(client, af)
is_dns = False
if len(data) > header_length + 13 and data[header_length + 4 : header_length + 12] == b"\x00\x01\x00\x00\x00\x00\x00\x00":
is_dns = True
else:
pass
if sa[1] == 53 and is_dns: #DNS
logging.debug("DNS query %s from %s:%d" % (common.to_str(sa[0]), r_addr[0], r_addr[1]))
self._cache_dns_client[key] = (client, uid)
else:
self._cache[key] = (client, uid)
self._client_fd_to_server_addr[client.fileno()] = (r_addr, af)
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN, self)
logging.debug('UDP port %5d sockets %d' % (self._listen_port, len(self._sockets)))
if uid is not None:
user_id = struct.unpack('<I', client_uid)[0]
else:
client, client_uid = client_pair
self._cache.clear(self._udp_cache_size)
self._cache_dns_client.clear(16)
common.connect_log('UDP data from %s:%d', common.to_str(r_addr[0]), r_addr[1])
if self._is_local:
ref_iv = [encrypt.encrypt_new_iv(self._method)]
self._protocol.obfs.server_info.iv = ref_iv[0]
data = self._protocol.client_udp_pre_encrypt(data)
#logging.debug("%s" % (binascii.hexlify(data),))
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 1, data, ref_iv)
if not data:
return
else:
data = data[header_length:]
if not data:
return
except Exception as e:
shell.print_exception(e)
logging.error("exception from user %d" % (user_id,))
try:
client.sendto(data, (server_addr, server_port))
self.add_transfer_u(client_uid, len(data))
common.connect_log('UDP data remote to %s:%d', common.to_str(server_addr), server_port)
if client_pair is None: # new request
addr, port = client.getsockname()[:2]
common.connect_log('UDP data to %s(%s):%d from %s:%d by user %d' %
(common.to_str(remote_addr[0]), common.to_str(server_addr), server_port, addr, port, user_id))
except IOError as e:
err = eventloop.errno_from_exception(e)
logging.warning('IOError sendto %s:%d by user %d' % (server_addr, server_port, user_id))
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
def _handle_client(self, sock):
data, r_addr = sock.recvfrom(BUF_SIZE)
common.connect_log('UDP data remote from %s:%d', common.to_str(r_addr[0]), r_addr[1])
if not data:
logging.debug('UDP handle_client: data is empty')
return
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
client_addr = self._client_fd_to_server_addr.get(sock.fileno())
client_uid = None
if client_addr:
addr = client_addr[0]
common.connect_log('UDP data to %s:%d', common.to_str(addr[0]), addr[1])
key = client_key(client_addr[0], client_addr[1])
client_pair = self._cache.get(key, None)
client_dns_pair = self._cache_dns_client.get(key, None)
if client_pair:
client, client_uid = client_pair
elif client_dns_pair:
client, client_uid = client_dns_pair
if not self._is_local:
addrlen = len(r_addr[0])
if addrlen > 255:
# drop
return
data = pack_addr(r_addr[0]) + struct.pack('>H', r_addr[1]) + data
ref_iv = [encrypt.encrypt_new_iv(self._method)]
self._protocol.obfs.server_info.iv = ref_iv[0]
data = self._protocol.server_udp_pre_encrypt(data, client_uid)
response = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 1,
data, ref_iv)
if not response:
return
else:
ref_iv = [0]
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 0,
data, ref_iv)
if not data:
return
self._protocol.obfs.server_info.recv_iv = ref_iv[0]
data = self._protocol.client_udp_post_decrypt(data)
header_result = parse_header(data)
if header_result is None:
return
#connecttype, dest_addr, dest_port, header_length = header_result
#logging.debug('UDP handle_client %s:%d to %s:%d' % (common.to_str(r_addr[0]), r_addr[1], dest_addr, dest_port))
response = b'\x00\x00\x00' + data
if client_addr:
if client_uid:
self.add_transfer_d(client_uid, len(response))
else:
self.server_transfer_dl += len(response)
self.write_to_server_socket(response, client_addr[0])
if client_dns_pair:
logging.debug("remove dns client %s:%d" % (client_addr[0][0], client_addr[0][1]))
del self._cache_dns_client[key]
self._close_client(client_dns_pair[0])
else:
# this packet is from somewhere else we know
# simply drop that packet
pass
def _handle_server_dns_resolved(self, error, remote_addr, server_addr,
params):
if error:
return
data, r_addr, uid, header_length, is_relay = params
if uid is None:
user_id = self._listen_port
else:
user_id = uid
try:
server_port = remote_addr[1]
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs: # drop
return
af, socktype, proto, canonname, sa = addrs[0]
server_addr = sa[0]
key = client_key(r_addr, af)
client_pair = self._cache.get(key, None)
if client_pair is None:
client_pair = self._cache_dns_client.get(key, None)
if client_pair is None:
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' %
common.to_str(sa[0]))
# drop
return
if self._forbidden_portset:
if sa[1] in self._forbidden_portset:
logging.debug('Port %d is in forbidden list, reject' %
sa[1])
# drop
return
client = socket.socket(af, socktype, proto)
client_uid = uid
client.setblocking(False)
self._socket_bind_addr(client, af, is_relay)
is_dns = False
if len(data) > header_length + 13 and data[
header_length + 4:header_length +
12] == b"\x00\x01\x00\x00\x00\x00\x00\x00":
is_dns = True
else:
pass
if sa[1] == 53 and is_dns: #DNS
logging.debug("DNS query %s from %s:%d" %
(common.to_str(sa[0]), r_addr[0], r_addr[1]))
self._cache_dns_client[key] = (client, uid)
else:
self._cache[key] = (client, uid)
self._client_fd_to_server_addr[client.fileno()] = (r_addr, af)
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN, self)
logging.debug('UDP port %5d sockets %d' %
(self._listen_port, len(self._sockets)))
if not self.is_pushing_detect_text_list:
for id in self.detect_text_list:
if common.match_regex(
self.detect_text_list[id]['regex'], str(data)):
if self._config['is_multi_user'] != 0 and uid != 0:
if self.is_cleaning_mu_detect_log_list == False and id not in self.mu_detect_log_list[
uid]:
self.mu_detect_log_list[uid].append(id)
else:
if self.is_cleaning_detect_log == False and id not in self.detect_log_list:
self.detect_log_list.append(id)
raise Exception(
'This connection match the regex: id:%d was reject,regex: %s ,connecting %s:%d from %s:%d via port %d'
% (self.detect_text_list[id]['id'],
self.detect_text_list[id]['regex'],
common.to_str(server_addr), server_port,
r_addr[0], r_addr[1], self._listen_port))
if not self.is_pushing_detect_hex_list:
for id in self.detect_hex_list:
if common.match_regex(
self.detect_hex_list[id]['regex'],
binascii.hexlify(data)):
if self._config['is_multi_user'] != 0 and uid != 0:
if self.is_cleaning_mu_detect_log_list == False and id not in self.mu_detect_log_list[
uid]:
self.mu_detect_log_list[uid].append(id)
else:
if self.is_cleaning_detect_log == False and id not in self.detect_log_list:
self.detect_log_list.append(id)
raise Exception(
'This connection match the regex: id:%d was reject,regex: %s ,connecting %s:%d from %s:%d via port %d'
% (self.detect_hex_list[id]['id'],
self.detect_hex_list[id]['regex'],
common.to_str(server_addr), server_port,
r_addr[0], r_addr[1], self._listen_port))
if not self._connect_hex_data:
common.connect_log(
'UDP data to %s:%d from %s:%d via port %d' %
(common.to_str(server_addr), server_port, r_addr[0],
r_addr[1], self._listen_port))
else:
common.connect_log(
'UDP data to %s:%d from %s:%d via port %d,hex data : %s'
%
(common.to_str(server_addr), server_port, r_addr[0],
r_addr[1], self._listen_port, binascii.hexlify(data)))
if self._config['is_multi_user'] != 2:
if common.to_str(
r_addr[0]
) in self.wrong_iplist and r_addr[
0] != 0 and self.is_cleaning_wrong_iplist == False:
del self.wrong_iplist[common.to_str(r_addr[0])]
if common.get_ip_md5(
r_addr[0], self._config['ip_md5_salt']
) not in self.connected_iplist and r_addr[
0] != 0 and self.is_cleaning_connected_iplist == False:
self.connected_iplist.append(
common.get_ip_md5(r_addr[0],
self._config['ip_md5_salt']))
else:
client, client_uid = client_pair
self._cache.clear(self._udp_cache_size)
self._cache_dns_client.clear(16)
if self._is_local:
ref_iv = [encrypt.encrypt_new_iv(self._method)]
self._protocol.obfs.server_info.iv = ref_iv[0]
data = self._protocol.client_udp_pre_encrypt(data)
#logging.debug("%s" % (binascii.hexlify(data),))
data = encrypt.encrypt_all_iv(
self._protocol.obfs.server_info.key, self._method, 1, data,
ref_iv)
if not data:
return
else:
data = data[header_length:]
if not data:
return
except Exception as e:
shell.print_exception(e)
if self._config['verbose']:
traceback.print_exc()
logging.error("exception from user %d" % (user_id, ))
try:
client.sendto(data, (server_addr, server_port))
self.add_transfer_u(client_uid, len(data))
if client_pair is None: # new request
addr, port = client.getsockname()[:2]
common.connect_log(
'UDP data to %s(%s):%d from %s:%d by user %d' %
(common.to_str(remote_addr[0]), common.to_str(server_addr),
server_port, addr, port, user_id))
except IOError as e:
err = eventloop.errno_from_exception(e)
logging.warning('IOError sendto %s:%d by user %d' %
(server_addr, server_port, user_id))
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
def _handle_client(self, sock):
data, r_addr = sock.recvfrom(BUF_SIZE)
if not data:
logging.debug('UDP handle_client: data is empty')
return
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
client_addr = self._client_fd_to_server_addr.get(sock.fileno())
client_uid = None
if client_addr:
key = client_key(client_addr[0], client_addr[1])
client_pair = self._cache.get(key, None)
client_dns_pair = self._cache_dns_client.get(key, None)
if client_pair:
client, client_uid = client_pair
elif client_dns_pair:
client, client_uid = client_dns_pair
if not self._is_local:
addrlen = len(r_addr[0])
if addrlen > 255:
# drop
return
data = pack_addr(r_addr[0]) + struct.pack('>H', r_addr[1]) + data
ref_iv = [encrypt.encrypt_new_iv(self._method)]
self._protocol.obfs.server_info.iv = ref_iv[0]
data = self._protocol.server_udp_pre_encrypt(data, client_uid)
response = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 1,
data, ref_iv)
if not response:
return
else:
ref_iv = [0]
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 0,
data, ref_iv)
if not data:
return
self._protocol.obfs.server_info.recv_iv = ref_iv[0]
data = self._protocol.client_udp_post_decrypt(data)
header_result = parse_header(data)
if header_result is None:
return
#connecttype, dest_addr, dest_port, header_length = header_result
#logging.debug('UDP handle_client %s:%d to %s:%d' % (common.to_str(r_addr[0]), r_addr[1], dest_addr, dest_port))
response = b'\x00\x00\x00' + data
if client_addr:
if client_uid:
self.add_transfer_d(client_uid, len(response))
else:
self.server_transfer_dl += len(response)
self.write_to_server_socket(response, client_addr[0])
if client_dns_pair:
logging.debug("remove dns client %s:%d" % (client_addr[0][0], client_addr[0][1]))
del self._cache_dns_client[key]
self._close_client(client_dns_pair[0])
else:
# this packet is from somewhere else we know
# simply drop that packet
pass
def _handle_server_dns_resolved(self, error, remote_addr, server_addr, params):
if error:
return
data, r_addr, uid, header_length = params
user_id = self._listen_port
try:
server_port = remote_addr[1]
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs: # drop
return
af, socktype, proto, canonname, sa = addrs[0]
server_addr = sa[0]
key = client_key(r_addr, af)
client_pair = self._cache.get(key, None)
if client_pair is None:
client_pair = self._cache_dns_client.get(key, None)
if client_pair is None:
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' % common.to_str(sa[0]))
# drop
return
if self._forbidden_portset:
if sa[1] in self._forbidden_portset:
logging.debug('Port %d is in forbidden list, reject' % sa[1])
# drop
return
client = socket.socket(af, socktype, proto)
client_uid = uid
client.setblocking(False)
self._socket_bind_addr(client, af)
is_dns = False
if len(data) > header_length + 13 and data[header_length + 4 : header_length + 12] == b"\x00\x01\x00\x00\x00\x00\x00\x00":
is_dns = True
else:
pass
if sa[1] == 53 and is_dns: #DNS
logging.debug("DNS query %s from %s:%d" % (common.to_str(sa[0]), r_addr[0], r_addr[1]))
self._cache_dns_client[key] = (client, uid)
else:
self._cache[key] = (client, uid)
self._client_fd_to_server_addr[client.fileno()] = (r_addr, af)
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN, self)
logging.debug('UDP port %5d sockets %d' % (self._listen_port, len(self._sockets)))
if uid is not None:
user_id = struct.unpack('<I', client_uid)[0]
else:
client, client_uid = client_pair
self._cache.clear(self._udp_cache_size)
self._cache_dns_client.clear(16)
if self._is_local:
ref_iv = [encrypt.encrypt_new_iv(self._method)]
self._protocol.obfs.server_info.iv = ref_iv[0]
data = self._protocol.client_udp_pre_encrypt(data)
#logging.debug("%s" % (binascii.hexlify(data),))
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key, self._method, 1, data, ref_iv)
if not data:
return
else:
data = data[header_length:]
if not data:
return
except Exception as e:
shell.print_exception(e)
logging.error("exception from user %d" % (user_id,))
try:
client.sendto(data, (server_addr, server_port))
self.add_transfer_u(client_uid, len(data))
if client_pair is None: # new request
addr, port = client.getsockname()[:2]
common.connect_log('UDP data to %s(%s):%d from %s:%d by user %d' %
(common.to_str(remote_addr[0]), common.to_str(server_addr), server_port, addr, port, user_id))
except IOError as e:
err = eventloop.errno_from_exception(e)
logging.warning('IOError sendto %s:%d by user %d' % (server_addr, server_port, user_id))
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
def _handle_server(self):
server = self._server_socket
data, r_addr = server.recvfrom(BUF_SIZE)
ogn_data = data
if not data:
logging.debug('UDP handle_server: data is empty')
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
uid = None
if self._is_local:
frag = common.ord(data[2])
if frag != 0:
logging.warn('drop a message since frag is not 0')
return
else:
data = data[3:]
else:
ref_iv = [0]
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key,
self._method, 0, data, ref_iv)
# decrypt data
if not data:
logging.debug('UDP handle_server: data is empty after decrypt')
return
self._protocol.obfs.server_info.recv_iv = ref_iv[0]
data, uid = self._protocol.server_udp_post_decrypt(data)
if self._config['is_multi_user'] != 0 and data:
if uid:
if uid not in self.mu_server_transfer_ul:
self.mu_server_transfer_ul[uid] = 0
if uid not in self.mu_server_transfer_dl:
self.mu_server_transfer_dl[uid] = 0
if uid not in self.mu_connected_iplist:
self.mu_connected_iplist[uid] = []
if uid not in self.mu_detect_log_list:
self.mu_detect_log_list[uid] = []
if common.get_ip_md5(
r_addr[0], self._config['ip_md5_salt']
) not in self.mu_connected_iplist[uid]:
self.mu_connected_iplist[uid].append(
common.get_ip_md5(r_addr[0],
self._config['ip_md5_salt']))
else:
raise Exception(
'This port is multi user in single port only,so The connection has been rejected, when connect from %s:%d via port %d'
% (r_addr[0], r_addr[1], self._listen_port))
is_relay = False
#logging.info("UDP data %s" % (binascii.hexlify(data),))
if not self._is_local:
if not self._is_relay(r_addr, ogn_data, uid):
data = pre_parse_header(data)
data = self._pre_parse_udp_header(data)
if data is None:
return
if isinstance(data, tuple):
return
# return self._handle_tcp_over_udp(data, r_addr)
else:
if self._config["is_multi_user"] == 0:
data, is_relay = self._handel_normal_relay(
r_addr, ogn_data)
else:
data, is_relay = self._handel_mu_relay(
r_addr, ogn_data, uid)
try:
header_result = parse_header(data)
except:
self._handel_protocol_error(r_addr, ogn_data)
return
if header_result is None:
self._handel_protocol_error(r_addr, ogn_data)
return
connecttype, dest_addr, dest_port, header_length = header_result
if self._is_local:
connecttype = 3
server_addr, server_port = self._get_a_server()
else:
server_addr, server_port = dest_addr, dest_port
if (connecttype & 7) == 3:
addrs = self._dns_cache.get(server_addr, None)
if addrs is None:
# TODO async getaddrinfo
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
else:
self._dns_cache[server_addr] = addrs
else:
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
af, socktype, proto, canonname, sa = addrs[0]
key = client_key(r_addr, af)
client_pair = self._cache.get(key, None)
if not client_pair:
client_pair = self._cache_dns_client.get(key, None)
if not client_pair:
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' %
common.to_str(sa[0]))
# drop
return
if self._forbidden_portset:
if sa[1] in self._forbidden_portset:
logging.debug('Port %d is in forbidden list, reject' %
sa[1])
# drop
return
client = socket.socket(af, socktype, proto)
client_uid = uid
client.setblocking(False)
self._socket_bind_addr(client, af, is_relay)
is_dns = False
if len(data) > 20 and data[
11:19] == b"\x00\x01\x00\x00\x00\x00\x00\x00":
is_dns = True
else:
pass
#logging.info("unknown data %s" % (binascii.hexlify(data),))
if sa[1] == 53 and is_dns: # DNS
logging.debug("DNS query %s from %s:%d" %
(common.to_str(sa[0]), r_addr[0], r_addr[1]))
self._cache_dns_client[key] = (client, uid)
else:
self._cache[key] = (client, uid)
self._client_fd_to_server_addr[client.fileno()] = (r_addr, af)
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN, self)
logging.debug('UDP port %5d sockets %d' %
(self._listen_port, len(self._sockets)))
if not self.is_pushing_detect_text_list:
for id in self.detect_text_list:
if common.match_regex(self.detect_text_list[id]['regex'],
common.to_str(data)):
if self._config['is_multi_user'] != 0 and uid != 0:
if self.is_cleaning_mu_detect_log_list == False and id not in self.mu_detect_log_list[
uid]:
self.mu_detect_log_list[uid].append(id)
else:
if self.is_cleaning_detect_log == False and id not in self.detect_log_list:
self.detect_log_list.append(id)
raise Exception(
'This connection match the regex: id:%d was reject,regex: %s ,connecting %s:%d from %s:%d via port %d'
% (self.detect_text_list[id]['id'],
self.detect_text_list[id]['regex'],
common.to_str(server_addr), server_port,
r_addr[0], r_addr[1], self._listen_port))
if not self.is_pushing_detect_hex_list:
for id in self.detect_hex_list:
if common.match_regex(self.detect_hex_list[id]['regex'],
binascii.hexlify(data)):
if self._config['is_multi_user'] != 0 and uid != 0:
if self.is_cleaning_mu_detect_log_list == False and id not in self.mu_detect_log_list[
uid]:
self.mu_detect_log_list[uid].append(id)
else:
if self.is_cleaning_detect_log == False and id not in self.detect_log_list:
self.detect_log_list.append(id)
raise Exception(
'This connection match the regex: id:%d was reject,regex: %s ,connecting %s:%d from %s:%d via port %d'
% (self.detect_hex_list[id]['id'],
self.detect_hex_list[id]['regex'],
common.to_str(server_addr), server_port,
r_addr[0], r_addr[1], self._listen_port))
if not self._connect_hex_data:
common.connect_log('UDP data to %s:%d from %s:%d via port %d' %
(common.to_str(server_addr), server_port,
r_addr[0], r_addr[1], self._listen_port))
else:
common.connect_log(
'UDP data to %s:%d from %s:%d via port %d,hex data : %s' %
(common.to_str(server_addr), server_port, r_addr[0],
r_addr[1], self._listen_port, binascii.hexlify(data)))
if self._config['is_multi_user'] != 2:
if common.to_str(r_addr[0]) in self.wrong_iplist and r_addr[
0] != 0 and self.is_cleaning_wrong_iplist == False:
del self.wrong_iplist[common.to_str(r_addr[0])]
if common.get_ip_md5(
r_addr[0], self._config['ip_md5_salt']
) not in self.connected_iplist and r_addr[
0] != 0 and self.is_cleaning_connected_iplist == False:
self.connected_iplist.append(
common.get_ip_md5(r_addr[0],
self._config['ip_md5_salt']))
else:
client, client_uid = client_pair
self._cache.clear(self._udp_cache_size)
self._cache_dns_client.clear(16)
if self._is_local:
ref_iv = [encrypt.encrypt_new_iv(self._method)]
self._protocol.obfs.server_info.iv = ref_iv[0]
data = self._protocol.client_udp_pre_encrypt(data)
#logging.debug("%s" % (binascii.hexlify(data),))
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key,
self._method, 1, data, ref_iv)
if not data:
return
else:
data = data[header_length:]
if not data:
return
try:
#logging.info('UDP handle_server sendto %s:%d %d bytes' % (common.to_str(server_addr), server_port, len(data)))
client.sendto(data, (server_addr, server_port))
self.add_transfer_u(client_uid, len(data))
except IOError as e:
err = eventloop.errno_from_exception(e)
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
def _handle_server(self):
server = self._server_socket
data, r_addr = server.recvfrom(BUF_SIZE)
ogn_data = data
if not data:
logging.debug('UDP handle_server: data is empty')
if self._stat_callback:
self._stat_callback(self._listen_port, len(data))
uid = None
if self._is_local:
frag = common.ord(data[2])
if frag != 0:
logging.warn('drop a message since frag is not 0')
return
else:
data = data[3:]
else:
ref_iv = [0]
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key,
self._method, 0, data, ref_iv)
# decrypt data
if not data:
logging.debug('UDP handle_server: data is empty after decrypt')
return
self._protocol.obfs.server_info.recv_iv = ref_iv[0]
data, uid = self._protocol.server_udp_post_decrypt(data)
#logging.info("UDP data %s" % (binascii.hexlify(data),))
if not self._is_local:
data = pre_parse_header(data)
data = self._pre_parse_udp_header(data)
if data is None:
return
if type(data) is tuple:
return
#return self._handle_tcp_over_udp(data, r_addr)
try:
header_result = parse_header(data)
except:
self._handel_protocol_error(r_addr, ogn_data)
return
if header_result is None:
self._handel_protocol_error(r_addr, ogn_data)
return
connecttype, dest_addr, dest_port, header_length = header_result
if self._is_local:
connecttype = 3
server_addr, server_port = self._get_a_server()
else:
server_addr, server_port = dest_addr, dest_port
if (connecttype & 7) == 3:
addrs = self._dns_cache.get(server_addr, None)
if addrs is None:
# TODO async getaddrinfo
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
else:
self._dns_cache[server_addr] = addrs
else:
addrs = socket.getaddrinfo(server_addr, server_port, 0,
socket.SOCK_DGRAM, socket.SOL_UDP)
if not addrs:
# drop
return
af, socktype, proto, canonname, sa = addrs[0]
key = client_key(r_addr, af)
client_pair = self._cache.get(key, None)
if client_pair is None:
client_pair = self._cache_dns_client.get(key, None)
if client_pair is None:
if self._forbidden_iplist:
if common.to_str(sa[0]) in self._forbidden_iplist:
logging.debug('IP %s is in forbidden list, drop' %
common.to_str(sa[0]))
# drop
return
if self._forbidden_portset:
if sa[1] in self._forbidden_portset:
logging.debug('Port %d is in forbidden list, reject' %
sa[1])
# drop
return
client = socket.socket(af, socktype, proto)
client_uid = uid
client.setblocking(False)
self._socket_bind_addr(client, af)
is_dns = False
if len(data) > 20 and data[
11:19] == b"\x00\x01\x00\x00\x00\x00\x00\x00":
is_dns = True
else:
pass
#logging.info("unknown data %s" % (binascii.hexlify(data),))
if sa[1] == 53 and is_dns: #DNS
logging.debug("DNS query %s from %s:%d" %
(common.to_str(sa[0]), r_addr[0], r_addr[1]))
self._cache_dns_client[key] = (client, uid)
else:
self._cache[key] = (client, uid)
self._client_fd_to_server_addr[client.fileno()] = (r_addr, af)
self._sockets.add(client.fileno())
self._eventloop.add(client, eventloop.POLL_IN, self)
logging.debug('UDP port %5d sockets %d' %
(self._listen_port, len(self._sockets)))
if uid is None:
user_id = self._listen_port
else:
user_id = struct.unpack('<I', client_uid)[0]
else:
client, client_uid = client_pair
self._cache.clear(self._udp_cache_size)
self._cache_dns_client.clear(16)
if self._is_local:
ref_iv = [encrypt.encrypt_new_iv(self._method)]
self._protocol.obfs.server_info.iv = ref_iv[0]
data = self._protocol.client_udp_pre_encrypt(data)
#logging.debug("%s" % (binascii.hexlify(data),))
data = encrypt.encrypt_all_iv(self._protocol.obfs.server_info.key,
self._method, 1, data, ref_iv)
if not data:
return
else:
data = data[header_length:]
if not data:
return
try:
#logging.info('UDP handle_server sendto %s:%d %d bytes' % (common.to_str(server_addr), server_port, len(data)))
client.sendto(data, (server_addr, server_port))
if client_pair is None: # new request
addr, port = client.getsockname()[:2]
common.connect_log('UDP data to %s:%d from %s:%d by UID %d' %
(common.to_str(server_addr), server_port,
addr, port, user_id))
self.add_transfer_u(client_uid, len(data))
except IOError as e:
err = eventloop.errno_from_exception(e)
if err in (errno.EINPROGRESS, errno.EAGAIN):
pass
else:
shell.print_exception(e)
