[Python-Dev] 2.4 asyncore headache
Nick Coghlan
ncoghlan at iinet.net.au
Sat Aug 14 09:40:18 CEST 2004
Tim Peters wrote:
> [Nick Coghlan]
>
>>A couple of days ago I ran the test suite with -unetwork, and that test
>>failed, but I haven't got around to looking into it yet. Could this be
>>related?
>
>
> Which OS? asyncore isn't involved in that test, so the patch could
> not have affected it. SocketServer.py has its own, separate code
> using SO_REUSEADDR in some cases.
Ah, OK, it was just a thought. I'm on Windows XP SP1, and it's
consistently choking on the second attempt to test the UDP Server:
==Test=Output==
[snipped output from TCP tests]
ADDR = ('localhost', 12963)
CLASS = SocketServer.UDPServer
server created
thread: creating server
server running
thread: serving three times
test client 0
test client 1
test test_socketserver failed -- test failed
1 test failed:
test_socketserver
^C
==End=Test=Output==
The Ctrl-Break comes from the fact that the test hangs at that point
without exiting. 'netstat -a' shows that there isn't anything using
anything even close to those port numbers.
I plan to do some more poking to try and narrow down a bit further what
is going on before going to SF with it. (There are 5 different network
connections on this laptop, including a virtual one to the Linux
install, so I wouldn't be surprised if there is something odd going on
with the network interface)
> It also says:
>
> This is only a problem on multi-user machines that don't have restricted
> logins, it is NOT a vulnerability from outside the machine. And it is easily
> avoided by binding your server to the machine's address.
>
> If you're running a server on an open Windows machine, worrying about
> details of socket reuse may not be the best use of your security time
> <wink>.
Indeed. I think it suggests that continuing to use SO_REUSEADDR normally
on Windows is the best option for ayncore, though.
Windows users just need to be aware that it doesn't mean quite the same
thing as it does on a Unix-like system (actually, some of the other
Google hits made me wonder if it really means the same thing in all the
different Unix variants in the first place. . .)
Regards,
Nick.
--
Nick Coghlan | Eugene, Oregon
Email: ncoghlan at email.com | USA
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