[issue12197] non-blocking SSL write in Windows sends large data but raises exception
David Siroky added the comment:
I didn't meant blocking as setblocking(True). I use select/poll but I can't use
returned value from send() immediately since in Windows there are often needed
more send rounds to actually know how much data was sent.
E.g. in Linux I know it after the first call:
sslsock.write("abcd") -> returns 2
poll(sslsock)
sslsock.write("cd")
in Windows I must do:
sslsock.write("abcd") -> raises SSLError
poll(sslsock)
sslsock.write("abcd") -> returns 4
As I wrote it might be inconsistency in OpenSSL and not in Python's wrapper.
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[issue12197] non-blocking SSL write in Windows sends large data but raises exception
David Siroky added the comment: Sorry, I attached wrong example version. It uses repeated sslsock.write() of the same buffer after catching SSL_ERROR_WANT_WRITE. It delivers the full block but this is a blocking operation. I'm troubled with non-blocking writes. But as I dig deeper into the problem it looks like an inconsistency in OpenSSL (Linux vs. MSW). In Linux sslsock.write() always (as far as I can tell) sends some or all of the data and returns the amount. Like the plain socket.send(). In Windows it raises an exception if the data is larger then some uncertain size (mostly 16kB). I'm working on snakeMQ asynchronous messaging library where the "packeter" layer relies on the sock.send() returning actual amount of sent bytes. This is not working in Windows if the link uses SSL. Tested on WinXP, py2.6, py3.2. -- Added file: http://bugs.python.org/file22280/ssl_sock_test_fix.py ___ Python tracker <http://bugs.python.org/issue12197> ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue12197] non-blocking SSL write in Windows sends large data but raises exception
New submission from David Siroky : Trying to send large bulk of data in MS Windows via non-blocking SSLSocket raises an exception but part of the data is delivered. E.g. ssl_socket.write(b"a" * 20) raises ssl.SSLError: [Errno 3] _ssl.c:1126: The operation did not complete (write) There is no way to get the sent bytes count which is essential in non-blocking communication. ssl_socket.send() returns 0. This should be unified with posix behavior. -- components: Extension Modules, Windows files: ssl_sock_test.py messages: 137092 nosy: dsiroky priority: normal severity: normal status: open title: non-blocking SSL write in Windows sends large data but raises exception type: behavior versions: Python 2.6, Python 3.2 Added file: http://bugs.python.org/file22157/ssl_sock_test.py ___ Python tracker <http://bugs.python.org/issue12197> ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
