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Exemplify use of mbedtls_ssl_check_pending in ssl_server2.c

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This commit is contained in:
Hanno Becker 2018-03-13 11:39:09 +00:00
parent 6a33f59f76
commit ddc3ebbc3f
1 changed files with 26 additions and 10 deletions
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36
programs/ssl/ssl_server2.c
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@ -2417,21 +2417,37 @@ data_exchange:
while( 1 ) while( 1 )
{ {
/* Without the call to `mbedtls_ssl_check_pending`, it might
* happen that the client sends application data in the same
* datagram as the Finished message concluding the handshake.
* In this case, the application data would be ready to be
* processed while the underlying transport wouldn't signal
* any further incoming data.
*
* See the test 'Event-driven I/O: session-id resume, UDP packing'
* in tests/ssl-opt.sh.
*/
/* For event-driven IO, wait for socket to become available */
if( mbedtls_ssl_check_pending( &ssl ) == 0 &&
opt.event == 1 /* level triggered IO */ )
{
#if defined(MBEDTLS_TIMING_C)
idle( &client_fd, &timer, MBEDTLS_ERR_SSL_WANT_READ );
#else
idle( &client_fd, MBEDTLS_ERR_SSL_WANT_READ );
#endif
}
ret = mbedtls_ssl_read( &ssl, buf, len ); ret = mbedtls_ssl_read( &ssl, buf, len );
/* Note that even if `mbedtls_ssl_check_pending` returns true,
* it can happen that the subsequent call to `mbedtls_ssl_read`
* returns `MBEDTLS_ERR_SSL_WANT_READ`, because the pending messages
* might be discarded (e.g. because they are retransmissions). */
if( ret != MBEDTLS_ERR_SSL_WANT_READ && if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
ret != MBEDTLS_ERR_SSL_WANT_WRITE ) ret != MBEDTLS_ERR_SSL_WANT_WRITE )
break; break;
/* For event-driven IO, wait for socket to become available */
if( opt.event == 1 /* level triggered IO */ )
{
#if defined(MBEDTLS_TIMING_C)
idle( &client_fd, &timer, ret );
#else
idle( &client_fd, ret );
#endif
}
} }
if( ret <= 0 ) if( ret <= 0 )