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Enhance and extend checking of message processing state

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-  Enhances the documentation of mbedtls_ssl_get_bytes_avail (return
   the number of bytes left in the current application data record, if
   there is any).
-  Introduces a new public function mbedtls_ssl_check_pending for
   checking whether any data in the internal buffers still needs to be
   processed. This is necessary for users implementing event-driven IO
   to decide when they can safely idle until they receive further
   events from the underlying transport.
This commit is contained in:
Hanno Becker 2017-10-10 11:51:19 +01:00
parent 16970d2912
commit 8b170a0a0b
2 changed files with 106 additions and 2 deletions
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61
library/ssl_tls.c
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@ -6392,6 +6392,67 @@ size_t mbedtls_ssl_get_bytes_avail( const mbedtls_ssl_context *ssl )
return( ssl->in_offt == NULL ? 0 : ssl->in_msglen );
}
int mbedtls_ssl_check_pending( const mbedtls_ssl_context *ssl )
{
/*
* Case A: We're currently holding back
* a message for further processing.
*/
if( ssl->keep_current_message == 1 )
{
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: record "
"held back for processing" ) );
return( 1 );
}
/*
* Case B: Further records are pending in the current datagram.
*/
#if defined(MBEDTLS_SSL_PROTO_DTLS)
if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
ssl->in_left > ssl->next_record_offset )
{
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: more records "
"within current datagram" ) );
return( 1 );
}
#endif /* MBEDTLS_SSL_PROTO_DTLS */
/*
* Case C: A handshake message is being processed.
*/
/* TODO This needs correction in the same way as
* read_record_layer, see IOTSSL-1414 */
if( ssl->in_hslen > 0 && ssl->in_hslen < ssl->in_msglen )
{
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: more handshake "
"messages within current record" ) );
return( 1 );
}
/*
* Case D: An application data message is being processed
*/
if( ssl->in_offt != NULL )
{
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: application data "
"record is being processed" ) );
return( 1 );
}
/*
* In all other cases, the rest of the message can be dropped.
* As in ssl_read_record_layer, this needs to be adapted if
* we implement support for multiple alerts in single records.
*/
MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_check_pending: nothing pending" ) );
return( 0 );
}
uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl )
{
if( ssl->session != NULL )