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# Higher-level SSL objects used by rpclib
#
# Copyright (c) 2002 Red Hat, Inc.
#
# Author: Mihai Ibanescu <misa@redhat.com>
# Modifications by Dan Williams <dcbw@redhat.com>
from OpenSSL import SSL
import time, socket, select
from func.CommonErrors import canIgnoreSSLError
class SSLConnection:
"""
This whole class exists just to filter out a parameter
passed in to the shutdown() method in SimpleXMLRPC.doPOST()
"""
DEFAULT_TIMEOUT = 20
def __init__(self, conn):
"""
Connection is not yet a new-style class,
so I'm making a proxy instead of subclassing.
"""
self.__dict__["conn"] = conn
self.__dict__["close_refcount"] = 0
self.__dict__["closed"] = False
self.__dict__["timeout"] = self.DEFAULT_TIMEOUT
def __del__(self):
self.__dict__["conn"].close()
def __getattr__(self,name):
return getattr(self.__dict__["conn"], name)
def __setattr__(self,name, value):
setattr(self.__dict__["conn"], name, value)
def settimeout(self, timeout):
if timeout == None:
self.__dict__["timeout"] = self.DEFAULT_TIMEOUT
else:
self.__dict__["timeout"] = timeout
self.__dict__["conn"].settimeout(timeout)
def shutdown(self, how=1):
"""
SimpleXMLRpcServer.doPOST calls shutdown(1),
and Connection.shutdown() doesn't take
an argument. So we just discard the argument.
"""
self.__dict__["conn"].shutdown()
def accept(self):
"""
This is the other part of the shutdown() workaround.
Since servers create new sockets, we have to infect
them with our magic. :)
"""
c, a = self.__dict__["conn"].accept()
return (SSLConnection(c), a)
def makefile(self, mode, bufsize):
"""
We need to use socket._fileobject Because SSL.Connection
doesn't have a 'dup'. Not exactly sure WHY this is, but
this is backed up by comments in socket.py and SSL/connection.c
Since httplib.HTTPSResponse/HTTPConnection depend on the
socket being duplicated when they close it, we refcount the
socket object and don't actually close until its count is 0.
"""
self.__dict__["close_refcount"] = self.__dict__["close_refcount"] + 1
return PlgFileObject(self, mode, bufsize)
def close(self):
if self.__dict__["closed"]:
return
self.__dict__["close_refcount"] = self.__dict__["close_refcount"] - 1
if self.__dict__["close_refcount"] == 0:
self.shutdown()
self.__dict__["conn"].close()
self.__dict__["closed"] = True
def sendall(self, data, flags=0):
"""
- Use select() to simulate a socket timeout without setting the socket
to non-blocking mode.
- Don't use pyOpenSSL's sendall() either, since it just loops on WantRead
or WantWrite, consuming 100% CPU, and never times out.
"""
timeout = self.__dict__["timeout"]
con = self.__dict__["conn"]
(read, write, excpt) = select.select([], [con], [], timeout)
if not con in write:
raise socket.timeout((110, "Operation timed out."))
starttime = time.time()
origlen = len(data)
sent = -1
while len(data):
curtime = time.time()
if curtime - starttime > timeout:
raise socket.timeout((110, "Operation timed out."))
try:
sent = con.send(data, flags)
except SSL.SysCallError, e:
if e[0] == 32: # Broken Pipe
self.close()
sent = 0
else:
raise socket.error(e)
except (SSL.WantWriteError, SSL.WantReadError):
time.sleep(0.2)
continue
data = data[sent:]
return origlen - len(data)
def recv(self, bufsize, flags=0):
"""
Use select() to simulate a socket timeout without setting the socket
to non-blocking mode
"""
timeout = self.__dict__["timeout"]
con = self.__dict__["conn"]
(read, write, excpt) = select.select([con], [], [], timeout)
if not con in read:
raise socket.timeout((110, "Operation timed out."))
starttime = time.time()
while True:
curtime = time.time()
if curtime - starttime > timeout:
raise socket.timeout((110, "Operation timed out."))
try:
return con.recv(bufsize, flags)
except SSL.ZeroReturnError:
return None
except SSL.WantReadError:
time.sleep(0.2)
except Exception, e:
if canIgnoreSSLError(e):
return None
else:
raise e
return None
class PlgFileObject(socket._fileobject):
def close(self):
"""
socket._fileobject doesn't actually _close_ the socket,
which we want it to do, so we have to override.
"""
try:
if self._sock:
self.flush()
self._sock.close()
finally:
self._sock = None
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