On Wednesday 10 April 2013 22:20:23 Nikos Mavrogiannopoulos wrote: > On 04/10/2013 06:07 PM, Joke de Buhr wrote: > > yes i'm using the non-blocking mode. for client and server sesssion. > > > > gnutls_init(&session_, GNUTLS_DATAGRAM | GNUTLS_NONBLOCK | ...); > > > > here is a stack trace where the pull function is called: > > > > #0 _gnutls_io_check_recv() at /lib/gnutls_buffers.c:677 > > #1 _dtls_wait_and_retransmit() at /lib/gnutls_dtls.c:414 > > #2 _gnutls_recv_handshake_final() at /lib/gnutls_handshake.c:2883 > > #3 _gnutls_handshake_client() at /lib/gnutls_handshake.c:2730 > > #4 gnutls_handshake() at /lib/gnutls_handshake.c:2450 > > #5 session<server::gateway<server::server<boost::asio::ip::udp> > > > > >> ::handshake() at /home/joke/Projects/vpn/src/session.t++:175 > > > > the pull timeout function returns GNUTLS_E_AGAIN. > > but _dtls_retransmit is called only if the return value was > > GNUTLS_E_TIMEDOUT. > That's pretty correct. _gnutls_io_check_recv() returns > GNUTLS_E_TIMEDOUT, zero or fatal error values. > > Your pull timeout function should return 0 on timeout, a positive number > if data can be received and -1 on error. I'll make the documentation > more clear on that, but in your case you should have returned zero > instead of EAGAIN.
i see the point especially if i would use a traditional select based approach while waiting for a timeout. but let's assume: the handshake timeout isn't set at all. my pull timeout function should never block. as a consequence the pull_timeout_function() will always get called with an timeout value of 0. should i return 0 or set gnutls EAGAIN value and return -1 if no new data is available? i can't wait using select. the function can't block. if data is available handshake() or receive() will be called. now the handshake() will return a value of GNUTLS_EAGAIN and i use gnutls_dtls_get_timeout() and set a timer waiting for this particular session to run out while in the mean time i handle other session. if the timer for this particular session runs out the handshake function is called again. regards joke > regards, > Nikos _______________________________________________ Gnutls-help mailing list [email protected] http://lists.gnupg.org/mailman/listinfo/gnutls-help
