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#
# Copyright (c) ZeroC, Inc. All rights reserved.
#
import sys
import threading
import socket
import select
class InvalidRequest(Exception):
pass
class BaseConnection(threading.Thread):
def __init__(self, socket, remote):
threading.Thread.__init__(self)
self.socket = socket
self.remote = remote
self.remoteSocket = None
self.closed = False
def response(self, code):
pass
def request(self, data):
pass
def close(self):
if self.closed:
return
self.closed = True
try:
if self.socket:
self.socket.close()
self.socket = None
if self.remoteSocket:
self.remoteSocket.close()
self.remoteSocket = None
except:
pass
def run(self):
try:
remoteAddr = self.request(self.socket)
self.remoteSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
self.remoteSocket.connect(remoteAddr)
self.socket.send(self.response(True))
except:
self.socket.send(self.response(False))
return
try:
while(not self.closed):
readables, writeables, exceptions = select.select([self.socket, self.remoteSocket], [], [])
for r in readables:
w = self.remoteSocket if r == self.socket else self.socket
data = r.recv(4096)
if(len(data) == 0):
self.closed = True
break
w.send(data)
except InvalidRequest:
print("invalid request")
except Exception:
pass
except Exception:
pass
finally:
if self.socket:
self.socket.close()
if self.remoteSocket:
self.remoteSocket.close()
class BaseProxy(threading.Thread):
def __init__(self, port):
threading.Thread.__init__(self)
self.port = port
self.closed = False
self.cond = threading.Condition()
self.socket = None
self.failed = None
self.connections = []
self.start()
with self.cond:
while not self.socket and not self.failed:
self.cond.wait(60)
if self.failed:
raise self.failed
def createConnection(self):
return None
def run(self):
with self.cond:
try:
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
if hasattr(socket, "SO_REUSEPORT"):
try:
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
except:
# Ignore, this can throw on some platforms if not supported (e.g: ARMHF/Qemu)
pass
self.socket.bind(("127.0.0.1", self.port))
self.socket.listen(1)
self.cond.notify()
except Exception as ex:
self.failed = ex
self.socket.close()
self.socket = None
self.cond.notify()
return
try:
while not self.closed:
incoming, peer = self.socket.accept()
connection = self.createConnection(incoming, peer)
connection.start()
with self.cond:
self.connections.append(connection)
except:
pass
finally:
self.socket.close()
self.socket = None
def terminate(self):
with self.cond:
if self.closed:
return
self.closed = True
for c in self.connections:
try:
c.close()
c.join()
except Exception as ex:
print(ex)
try:
connectToSelf = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
connectToSelf.connect(("127.0.0.1", self.port))
except Exception as ex:
print(ex)
finally:
connectToSelf.close()
connectToSelf = None
self.join()
class SocksConnection(BaseConnection):
def request(self, s):
def decode(c):
return ord(c) if sys.version_info[0] == 2 else c
data = s.recv(9) # Read the 9 bytes request
if not data or len(data) == 0:
raise InvalidRequest
if decode(data[0]) != 4:
raise InvalidRequest
if decode(data[1]) != 1:
raise InvalidRequest
port = (decode(data[2]) << 8) + decode(data[3])
addr = socket.inet_ntoa(data[4:8])
return (addr, port)
def response(self, success):
def encode(c):
return chr(c)
packet = encode(0)
packet += encode(90 if success else 91)
packet += encode(0)
packet += encode(0)
packet += encode(0)
packet += encode(0)
packet += encode(0)
packet += encode(0)
return packet if sys.version_info[0] == 2 else bytes(packet, "ascii")
class SocksProxy(BaseProxy):
def createConnection(self, socket, peer):
return SocksConnection(socket, peer)
class HttpConnection(BaseConnection):
def request(self, s):
def decode(c):
return c[0] if sys.version_info[0] == 2 else chr(c[0])
data = ""
while(len(data) < 4 or data[len(data) - 4:] != "\r\n\r\n"):
data += decode(s.recv(1))
if data.find("CONNECT ") != 0:
raise InvalidRequest
sep = data.find(":")
if sep < len("CONNECT ") + 1:
raise InvalidRequest
host = data[len("CONNECT "):sep]
space = data.find(" ", sep)
if space < sep + 1:
raise InvalidRequest
port = int(data[sep + 1:space])
return (host, port)
def response(self, success):
if(success):
s = "HTTP/1.1 200 OK\r\nServer: CERN/3.0 libwww/2.17\r\n\r\n"
else:
s = "HTTP/1.1 404\r\n\r\n"
return s if sys.version_info[0] == 2 else bytes(s, "ascii")
class HttpProxy(BaseProxy):
def createConnection(self, socket, peer):
return HttpConnection(socket, peer)
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