[zeromq-dev] debugging curve handshake

Drew Crawford drew at sealedabstract.com
Fri Feb 14 15:20:36 CET 2014

It returns 0, which I think is the pass condition.  Good idea though, I wouldn’t have thought of that.

On Feb 14, 2014, at 7:51 AM, Laurent Alebarde <l.alebarde at free.fr> wrote:

> Does the selftest test_security_curve pass ?
> Le 14/02/2014 14:39, Drew Crawford a écrit :
>> Hello folks,
>> For some reason, a message sent from the REQ side of a REQ/ROUTER isn’t arriving.  I know from experience this is some kind of CURVE issue, but I have stared at my curve usage for several hours now without seeing the problem.  I’m hoping to collect some general strategies on how to debug curve authentication issues as I seem to hit problems like this from time to time.
>> Some notes:
>> It’s definitely a curve issue, as when I turn off curve authentication on both sides everything works fine.
>> Everybody’s on zeromq-4.0.3
>> I’m reasonably sure the issue is client-side, as a test client written in Python authenticates with the server successfully.
>> The server’s ZAP handler is never called, so something bad is happening very early
>> I’ve checked the obvious things: the server’s port is open, the client is setting all three of ZMQ_CURVE_PUBLICKEY, ZMQ_CURVE_SECRETKEY, and ZMQ_CURVE_SERVERKEY to what look like reasonable values
>> Client and server don’t have any zeromq errors returned during send, receive, or setsockopt
>> Server is running pyzmq on python 3.3 on Darwin, client is a C client built for the iPhoneSimulator which is i386-apple-darwin.
>> An obvious next step is to verify at the TCP level that a connection is being established, but I’m not totally sure what I can check that would verify that.
>> Beyond that I am interested in your thoughts on what I should test.  I really think there should be some better errors for CURVE issues as I seem to get stuck here a lot.  But for now I will settle for understanding what is wrong…
>> Drew
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