Peter Surda ba4162d7fe
Asyncore update
- get rid of per-connection writeQueue/receiveQueue, and instead use
strings and locking
- minor code cleanup
- all state handlers now should set expectBytes
- almost all data processing happens in ReceiveDataThread, and
AsyncoreThread is almost only I/O (plus TLS). AsyncoreThread simply
puts the connection object into the queue when it has some data for
- allow poll, epoll and kqueue handlers. kqueue is untested and
unoptimised, poll and epoll seem to work ok (linux)
- stack depth threshold handler  in decode_payload_content, this is
recursive and I think was causing occasional RuntimeErrors. Fixes #964
- longer asyncore loops, as now data is handled in ReceiveDataThread
- randomise node order when deciding what to download. Should prevent
retries being stuck to the same node
- socks cleanup (socks5 works ok, socks4a untested but should work too)
2017-07-06 19:45:36 +02:00

176 lines
6.2 KiB

import socket
import struct
from proxy import Proxy, ProxyError, GeneralProxyError
class Socks5AuthError(ProxyError):
errorCodes = ("Succeeded",
"Authentication is required",
"All offered authentication methods were rejected",
"Unknown username or invalid password",
"Unknown error")
class Socks5Error(ProxyError):
errorCodes = ("Succeeded",
"General SOCKS server failure",
"Connection not allowed by ruleset",
"Network unreachable",
"Host unreachable",
"Connection refused",
"TTL expired",
"Command not supported",
"Address type not supported",
"Unknown error")
class Socks5(Proxy):
def __init__(self, address=None):
Proxy.__init__(self, address)
self.ipaddr = None
self.destport = address[1]
def state_init(self):
if self._auth:
self.append_write_buf(struct.pack('BBBB', 0x05, 0x02, 0x00, 0x02))
self.append_write_buf(struct.pack('BBB', 0x05, 0x01, 0x00))
self.set_state("auth_1", length=0, expectBytes=2)
return True
def state_auth_1(self):
ret = struct.unpack('BB', self.read_buf)
if ret[0] != 5:
# general error
raise GeneralProxyError(1)
elif ret[1] == 0:
# no auth required
self.set_state("auth_done", length=2)
elif ret[1] == 2:
# username/password
self.append_write_buf(struct.pack('BB', 1, len(self._auth[0])) + \
self._auth[0] + struct.pack('B', len(self._auth[1])) + \
self.set_state("auth_needed", length=2, expectBytes=2)
if ret[1] == 0xff:
# auth error
raise Socks5AuthError(2)
# other error
raise GeneralProxyError(1)
return True
def state_auth_needed(self):
ret = struct.unpack('BB', self.read_buf[0:2])
if ret[0] != 1:
# general error
raise GeneralProxyError(1)
if ret[1] != 0:
# auth error
raise Socks5AuthError(3)
# all ok
self.set_state("auth_done", length=2)
return True
def state_pre_connect(self):
# Get the response
if self.read_buf[0:1] != chr(0x05).encode():
raise GeneralProxyError(1)
elif self.read_buf[1:2] != chr(0x00).encode():
# Connection failed
if ord(self.read_buf[1:2])<=8:
raise Socks5Error(ord(self.read_buf[1:2]))
raise Socks5Error(9)
# Get the bound address/port
elif self.read_buf[3:4] == chr(0x01).encode():
self.set_state("proxy_addr_1", length=4, expectBytes=4)
elif self.read_buf[3:4] == chr(0x03).encode():
self.set_state("proxy_addr_2_1", length=4, expectBytes=1)
raise GeneralProxyError(1)
return True
def state_proxy_addr_1(self):
self.boundaddr = self.read_buf[0:4]
self.set_state("proxy_port", length=4, expectBytes=2)
return True
def state_proxy_addr_2_1(self):
self.address_length = ord(self.read_buf[0:1])
self.set_state("proxy_addr_2_2", length=1, expectBytes=self.address_length)
return True
def state_proxy_addr_2_2(self):
self.boundaddr = self.read_buf[0:self.address_length]
self.set_state("proxy_port", length=self.address_length, expectBytes=2)
return True
def state_proxy_port(self):
self.boundport = struct.unpack(">H", self.read_buf[0:2])[0]
self.__proxysockname = (self.boundaddr, self.boundport)
if self.ipaddr is not None:
self.__proxypeername = (socket.inet_ntoa(self.ipaddr), self.destination[1])
self.__proxypeername = (self.destination[0], self.destport)
self.set_state("proxy_handshake_done", length=2)
return True
def proxy_sock_name(self):
return socket.inet_ntoa(self.__proxysockname[0])
class Socks5Connection(Socks5):
def __init__(self, address):
Socks5.__init__(self, address=address)
def state_auth_done(self):
# Now we can request the actual connection
self.append_write_buf(struct.pack('BBB', 0x05, 0x01, 0x00))
# If the given destination address is an IP address, we'll
# use the IPv4 address request even if remote resolving was specified.
self.ipaddr = socket.inet_aton(self.destination[0])
self.append_write_buf(chr(0x01).encode() + self.ipaddr)
except socket.error:
# Well it's not an IP number, so it's probably a DNS name.
if Proxy._remote_dns:
# Resolve remotely
self.ipaddr = None
self.append_write_buf(chr(0x03).encode() + chr(len(self.destination[0])).encode() + self.destination[0])
# Resolve locally
self.ipaddr = socket.inet_aton(socket.gethostbyname(self.destination[0]))
self.append_write_buf(chr(0x01).encode() + self.ipaddr)
self.append_write_buf(struct.pack(">H", self.destination[1]))
self.set_state("pre_connect", length=0, expectBytes=4)
return True
def state_pre_connect(self):
return Socks5.state_pre_connect(self)
except Socks5Error as e:
class Socks5Resolver(Socks5):
def __init__(self, host): = host
self.port = 8444
Socks5.__init__(self, address=(, self.port))
def state_auth_done(self):
# Now we can request the actual connection
self.append_write_buf(struct.pack('BBB', 0x05, 0xF0, 0x00))
self.append_write_buf(chr(0x03).encode() + chr(len( + str(
self.append_write_buf(struct.pack(">H", self.port))
self.set_state("pre_connect", length=0, expectBytes=4)
return True
def resolved(self):
print "Resolved %s as %s" % (, self.proxy_sock_name())