PyBitmessage/src/network/proxy.py

242 lines
7.7 KiB
Python
Raw Normal View History

# SOCKS5 only
import asyncore
import socket
import struct
class Proxy(asyncore.dispatcher):
# these are global, and if you change config during runtime, all active/new
# instances should change too
_proxy = ["", 1080]
_auth = None
_buf_len = 131072
_remote_dns = True
@property
def proxy(self):
return self.__class__._proxy
@proxy.setter
def proxy(self, address):
if (not type(address) in (list,tuple)) or (len(address) < 2) or (type(address[0]) != type('')) or (type(address[1]) != int):
raise
self.__class__._proxy = address
@property
def auth(self):
return self.__class__._auth
@auth.setter
def auth(self, authTuple):
self.__class__._auth = authTuple
def __init__(self, address=None):
if (not type(address) in (list,tuple)) or (len(address) < 2) or (type(address[0]) != type('')) or (type(address[1]) != int):
raise
asyncore.dispatcher.__init__(self, self.sock)
self.destination = address
self.read_buf = ""
self.write_buf = ""
self.stage = "init"
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.sslSocket.setblocking(0)
self.connect(self.proxy)
def process(self):
try:
getattr(self, "state_" + str(self.stage))()
except AttributeError:
# missing stage
raise
def set_state(self, state):
self.state = state
self.read_buf = ""
def writable(self):
return len(self.write_buf) > 0
def readable(self):
return len(self.read_buf) < Proxy._buf_len
def handle_read(self):
self.read_buf += self.recv(Proxy._buf_len)
self.process()
def handle_write(self):
written = self.send(self.write_buf)
self.write_buf = self.write_buf[written:]
self.process()
class SOCKS5(Proxy):
def __init__(self, address=None, sock=None):
Proxy.__init__(self, address)
self.state = 0
def handle_connect(self):
self.process()
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")
def state_auth_1(self):
if len(self.read_buf) < 2:
return
ret = struct.unpack('BB', self.read_buf)
self.read_buf = self.read_buf[2:]
if ret[0] != 5:
# general error
raise
elif ret[1] == 0:
# no auth required
self.set_state("auth_done")
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")
else:
if ret[1] == 0xff:
# auth error
raise
else:
# other error
raise
def state_auth_needed(self):
if len(self.read_buf) < 2:
return
ret = struct.unpack('BB', self.read_buf)
if ret[0] != 1:
# general error
raise
if ret[1] != 0:
# auth error
raise
# all ok
self.set_state = ("auth_done")
class SOCKS5Connection(SOCKS5):
def __init__(self, address):
SOCKS5.__init__(self, 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:
ipaddr = socket.inet_aton(self.destination[0])
self.write_buf += chr(0x01).encode() + ipaddr
except socket.error:
# Well it's not an IP number, so it's probably a DNS name.
if Proxy._remote_dns:
# Resolve remotely
ipaddr = None
self.write_buf += chr(0x03).encode() + chr(len(self.destination[0])).encode() + self.destination[0]
else:
# Resolve locally
ipaddr = socket.inet_aton(socket.gethostbyname(self.destination[0]))
self.write_buf += chr(0x01).encode() + ipaddr
self.write_buf += struct.pack(">H", self.destination[1])
self.set_state = ("pre_connect")
def state_pre_connect(self):
if len(self.read_buf) < 4:
return
# Get the response
if self.read_buf[0:1] != chr(0x05).encode():
# general error
self.close()
raise
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
#raise Socks5Error((ord(resp[1:2]), _socks5errors[ord(resp[1:2])]))
else:
raise
#raise Socks5Error((9, _socks5errors[9]))
# Get the bound address/port
elif self_read_buf[3:4] == chr(0x01).encode():
self.set_state("proxy_addr_long")
elif resp[3:4] == chr(0x03).encode():
self.set_state("proxy_addr_short")
else:
self.close()
raise GeneralProxyError((1,_generalerrors[1]))
boundport = struct.unpack(">H", self.__recvall(2))[0]
self.__proxysockname = (boundaddr, boundport)
if ipaddr != None:
self.__proxypeername = (socket.inet_ntoa(ipaddr), destport)
else:
self.__proxypeername = (destaddr, destport)
def state_proxy_addr_long(self):
if len(self.read_buf) < 4:
return
self.boundaddr = self.read_buf[0:4]
self.set_state("proxy_port")
def state_proxy_addr_short(self):
if len(self.read_buf) < 1:
return
self.boundaddr = self.read_buf[0:1]
self.set_state("proxy_port")
def state_proxy_port(self):
if len(self.read_buf) < 2:
return
self.boundport = struct.unpack(">H", self.read_buf[0:2])[0]
self.__proxysockname = (self.boundaddr, self.boundport)
if ipaddr != None:
self.__proxypeername = (socket.inet_ntoa(ipaddr), destport)
else:
self.__proxypeername = (destaddr, destport)
class SOCKS5Resolver(SOCKS5):
def __init__(self, destpair):
SOCKS5.__init__(self, destpair)
def state_auth_done(self):
# Now we can request the actual connection
req = struct.pack('BBB', 0x05, 0xF0, 0x00)
req += chr(0x03).encode() + chr(len(host)).encode() + host
req = req + struct.pack(">H", 8444)
self.sendall(req)
# Get the response
ip = ""
resp = self.__recvall(4)
if resp[0:1] != chr(0x05).encode():
self.close()
raise GeneralProxyError((1, _generalerrors[1]))
elif resp[1:2] != chr(0x00).encode():
# Connection failed
self.close()
if ord(resp[1:2])<=8:
raise Socks5Error((ord(resp[1:2]), _socks5errors[ord(resp[1:2])]))
else:
raise Socks5Error((9, _socks5errors[9]))
# Get the bound address/port
elif resp[3:4] == chr(0x01).encode():
ip = socket.inet_ntoa(self.__recvall(4))
elif resp[3:4] == chr(0x03).encode():
resp = resp + self.recv(1)
ip = self.__recvall(ord(resp[4:5]))
else:
self.close()
raise GeneralProxyError((1,_generalerrors[1]))
boundport = struct.unpack(">H", self.__recvall(2))[0]
return ip