PyBitmessage/src/network/socks5.py

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import socket
import struct
from advanceddispatcher import AdvancedDispatcher
import asyncore_pollchoose as asyncore
from proxy import Proxy, ProxyError, GeneralProxyError
class Socks5AuthError(ProxyError): pass
class Socks5Error(ProxyError): pass
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.write_buf += struct.pack('BBBB', 0x05, 0x02, 0x00, 0x02)
else:
self.write_buf += struct.pack('BBB', 0x05, 0x01, 0x00)
self.set_state("auth_1", 0)
def state_auth_1(self):
if not self.read_buf_sufficient(2):
return False
ret = struct.unpack('BB', self.read_buf)
self.read_buf = self.read_buf[2:]
if ret[0] != 5:
# general error
raise GeneralProxyError
elif ret[1] == 0:
# no auth required
self.set_state("auth_done", 2)
elif ret[1] == 2:
# username/password
self.write_buf += struct.pack('BB', 1, len(self._auth[0])) + \
self._auth[0] + struct.pack('B', len(self._auth[1])) + \
self._auth[1]
self.set_state("auth_1", 2)
else:
if ret[1] == 0xff:
# auth error
raise Socks5AuthError
else:
# other error
raise Socks5Error
def state_auth_needed(self):
if not self.read_buf_sufficient(2):
return False
ret = struct.unpack('BB', self.read_buf)
if ret[0] != 1:
# general error
raise Socks5Error
if ret[1] != 0:
# auth error
raise Socks5AuthError
# all ok
self.set_state = ("auth_done", 2)
def state_pre_connect(self):
if not self.read_buf_sufficient(4):
return False
# Get the response
if self.read_buf[0:1] != chr(0x05).encode():
# general error
self.close()
raise Socks5Error
elif self.read_buf[1:2] != chr(0x00).encode():
# Connection failed
self.close()
if ord(self.read_buf[1:2])<=8:
# socks 5 erro
raise Socks5Error
#raise Socks5Error((ord(resp[1:2]), _socks5errors[ord(resp[1:2])]))
else:
raise Socks5Error
#raise Socks5Error((9, _socks5errors[9]))
# Get the bound address/port
elif self.read_buf[3:4] == chr(0x01).encode():
self.set_state("proxy_addr_1", 4)
elif self.read_buf[3:4] == chr(0x03).encode():
self.set_state("proxy_addr_2_1", 4)
else:
self.close()
#raise GeneralProxyError((1,_generalerrors[1]))
raise GeneralProxyError
def state_proxy_addr_1(self):
if not self.read_buf_sufficient(4):
return False
self.boundaddr = self.read_buf[0:4]
self.set_state("proxy_port", 4)
def state_proxy_addr_2_1(self):
if not self.read_buf_sufficient(1):
return False
self.address_length = ord(self.read_buf[0:1])
self.set_state("proxy_addr_2_2", 1)
def state_proxy_addr_2_2(self):
if not self.read_buf_sufficient(self.address_length):
return False
self.boundaddr = read_buf
self.set_state("proxy_port", self.address_length)
def state_proxy_port(self):
if not self.read_buf_sufficient(2):
return False
self.boundport = struct.unpack(">H", self.read_buf[0:2])[0]
self.__proxysockname = (self.boundaddr, self.boundport)
if self.ipaddr != None:
self.__proxypeername = (socket.inet_ntoa(self.ipaddr), self.destination[1])
else:
self.__proxypeername = (self.destination[0], self.destport)
self.set_state("socks_handshake_done", 2)
def proxy_sock_name(self):
return socket.inet_ntoa(self.__proxysockname[0])
def state_socks_handshake_done(self):
return False
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.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.
try:
self.ipaddr = socket.inet_aton(self.destination[0])
self.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.write_buf += chr(0x03).encode() + chr(len(self.destination[0])).encode() + self.destination[0]
else:
# Resolve locally
self.ipaddr = socket.inet_aton(socket.gethostbyname(self.destination[0]))
self.write_buf += chr(0x01).encode() + self.ipaddr
self.write_buf += struct.pack(">H", self.destination[1])
self.set_state("pre_connect", 0)
class Socks5Resolver(Socks5):
def __init__(self, host):
self.host = host
self.port = 8444
Socks5.__init__(self, address=(self.host, self.port))
def state_auth_done(self):
# Now we can request the actual connection
self.write_buf += struct.pack('BBB', 0x05, 0xF0, 0x00)
self.write_buf += chr(0x03).encode() + chr(len(self.host)).encode() + str(self.host)
self.write_buf += struct.pack(">H", self.port)
self.set_state("pre_connect", 0)
def resolved(self):
print "Resolved %s as %s" % (self.host, self.proxy_sock_name())