PyBitmessage-2021-04-27/src/network/socks4a.py
Peter Surda e309a1edb3
Asyncore update
- separate queue for processing blocking stuff on reception
- rewrote write buffer as a queue
- some addr handling
- number of half open connections correct
2017-05-25 23:04:33 +02:00

105 lines
3.7 KiB
Python

import socket
import struct
from advanceddispatcher import AdvancedDispatcher
import asyncore_pollchoose as asyncore
from proxy import Proxy, ProxyError, GeneralProxyError
class Socks4aError(ProxyError): pass
class Socks4a(Proxy):
def __init__(self, address=None):
Proxy.__init__(self, address)
self.ipaddr = None
self.destport = address[1]
def state_init(self):
self.set_state("auth_done", 0)
def state_pre_connect(self):
if not self.read_buf_sufficient(8):
return False
# Get the response
if self.read_buf[0:1] != chr(0x00).encode():
# bad data
self.close()
raise Socks4aError
elif self.read_buf[1:2] != chr(0x5A).encode():
# Connection failed
self.close()
if ord(self.read_buf[1:2]) in (91, 92, 93):
# socks 4 erro
raise Socks4aError
#raise Socks5Error((ord(resp[1:2]), _socks5errors[ord(resp[1:2])-90]))
else:
raise Socks4aError
#raise Socks4aError((94, _socks4aerrors[4]))
# Get the bound address/port
self.boundport = struct.unpack(">H", self.read_buf[2:4])[0]
self.boundaddr = self.read_buf[4:]
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", 8)
def proxy_sock_name(self):
return socket.inet_ntoa(self.__proxysockname[0])
def state_socks_handshake_done(self):
return False
class Socks4aConnection(Socks4a):
def __init__(self, address):
Socks4a.__init__(self, address=address)
def state_auth_done(self):
# Now we can request the actual connection
rmtrslv = False
self.writeQueue.put(struct.pack('>BBH', 0x04, 0x01, self.destination[1]))
# 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.writeQueue.put(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
rmtrslv = True
self.ipaddr = None
self.writeQueue.put(struct.pack("BBBB", 0x00, 0x00, 0x00, 0x01))
else:
# Resolve locally
self.ipaddr = socket.inet_aton(socket.gethostbyname(self.destination[0]))
self.writeQueue.put(self.ipaddr)
if self._auth:
self.writeQueue.put(self._auth[0])
self.writeQueue.put(chr(0x00).encode())
if rmtrslv:
self.writeQueue.put(self.destination[0] + chr(0x00).encode())
self.set_state("pre_connect", 0)
class Socks4aResolver(Socks4a):
def __init__(self, host):
self.host = host
self.port = 8444
Socks4a.__init__(self, address=(self.host, self.port))
def state_auth_done(self):
# Now we can request the actual connection
self.writeQueue.put(struct.pack('>BBH', 0x04, 0xF0, self.destination[1]))
self.writeQueue.put(struct.pack("BBBB", 0x00, 0x00, 0x00, 0x01))
if self._auth:
self.writeQueue.put(self._auth[0])
self.writeQueue.put(chr(0x00).encode())
self.writeQueue.put(self.host + chr(0x00).encode())
self.set_state("pre_connect", 0)
def resolved(self):
print "Resolved %s as %s" % (self.host, self.proxy_sock_name())