Hi

I have a .so for Android that encapsulates both pjsip and curl. In turn, both of them depend on openssl so all of them exist as static libs inside the final .so.

The problem is that the sharing of openssl breaks something and I am not yet able to figure out what.

Basically I do something like:

  * Start the pjsip stack, a ssl handshake is performed without any problems and we now have a working TLS socket with the sip server.
  * Do any http activity with curl
  * Break the sip connection, for instance by changing from wifi to 3g. This forces pjsip to try and re-register to the server using a new TLS connection.

The problem is that after curl has been initialised, pjsip is never able to establish a new socket, ever again. The failure is very brief:
!TLS connect() error: Unknown error 494241 [code=494241]

I have tried to figure out what error 494241 means without success.

My current assumption is that the error comes from inside openssl and that by initiating libcurl something shared is destroyed for pjsip. Curl keeps working fine but pjsip is never able to recover, not even after restarting the whole stack (including shutting down curl, which is strange).

If I instead of having pjsip and curl reside in the same .so, split them into two .so files each with their own libssl.a and libcrypto.a it works fine. So the problem appears to be them sharing a context of some kind.

I am not sure if its actually related but OkHttp seems to have had a similar issue at some point:
https://github.com/square/okhttp/issues/184
It might be completely unrelated (fortunately my app does not crash at least) but I wanted to mention it.

So, I do have a solution in the dual .so approach but this increases quite a lot the .apk size of the Android app so I would be really interested in if someone can help me explain the root cause of the issue. It is easy to reproduce so I am happy to provide more info.

Thanks in advance

Johan



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Received on 2016-04-19