Hello,
I seem to be running into a callback/timing-related bug.
I am integrating M2Crypto with OpenSSL 0.9.5a. M2Crypto is a Python
interface to OpenSSL; it allows one to write SSL clients and servers,
including OpenSSL callbacks, in Python. Presently, M2Crypto supports
SSL_set_info_callback() and SSL_set_verify_callback().
As demos/testbeds, I have implemented iterative, threading, forking
and single-threaded async-socket versions of the classic "echod"
server over SSL.
With OpenSSL 0.9.5a on FreeBSD 2 and Linux (Red Hat 5.2), iterative,
threading, forking and async work fine, both with and without
info/verification callbacks.
On WinNT with OpenSSL 0.9.5a, I'm seeing the following: iterative and
threading work fine, both with and without info/verification callbacks.
Async works fine, _without_ callbacks. Once a callback is used, async
crashes.
If I run both the async echod and the echo client on the same boxen,
echod crashes quickly, somewhere after "read client hello A". If I run
the echo client over the network, echod sometimes crashes later, somewhere
after "read client certificate A".
If I use a C info_callback, instead of a Python one, async sometimes
work.
In all cases, the error is as follows:
The instruction at "0x1e127028" referenced memory at "0x00000008".
The memory could not be "read".
Now, if I single-step through the async echod under the Python debugger,
it works!
With OpenSSL 0.9.4, they all work.
The FreeBSD, Linux and NT OS, C compiler setup, Python environment, etc.
have not changed, AFAIK. The FreeBSD is a P5-166, Linux P5-120, and the
NT Pentium II 400. (This NT boxen isn't mine, else it wouldn't be running
NT. ;-)
Has any one encountered errors similar to what I have described?
TIA. Cheers.
PS. On a happier note, M2Crypto now groks 0.9.5's S/MIME and interoperates
with Netscape Messenger. ;-)
PPS. M2Crypto can be obtained at http://www.post1.com/home/ngps/m2
--
Ng Pheng Siong <[EMAIL PROTECTED]> * http://www.post1.com/home/ngps
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