commit a58a89617236afb724d7dc0ef9393d906b0c8133
author Hanno Becker <hanno.becker@arm.com> Thu Jun 13 16:11:15 2019 +0100
committer Hanno Becker <hanno.becker@arm.com> Thu Jul 04 10:28:55 2019 +0100
tree 9fc13aefd315097bd1e7bb75255e31372a43c61b
parent ece325c8dd0e4fb1847b92530bfaaddc88e8d467

Allow compile-time configuration of I/O function pointers

Introduce the compile-time options
- MBEDTLS_SSL_CONF_RECV
- MBEDTLS_SSL_CONF_SEND
- MBEDTLS_SSL_CONF_RECV_TIMEOUT
which can be used to configure the callbacks for the underlying
transport at compile-time.

Code-size impact:

|  | GCC 8.2.1 | ARMC5 5.06 | ARMC6 6.12 |
| --- | --- | --- | --- |
| `libmbedtls.a` before | 23471 | 24077 | 27045 |
| `libmbedtls.a` before | 23379 | 23981 | 26941 |
| gain in Bytes | 92 | 96 | 104 |

programs/ssl/dtls_client.c

diff --git a/programs/ssl/dtls_client.c b/programs/ssl/dtls_client.c
index cb2851b..6f508ae 100644
--- a/programs/ssl/dtls_client.c
+++ b/programs/ssl/dtls_client.c
@@ -205,8 +205,13 @@
         goto exit;
     }
 
-    mbedtls_ssl_set_bio( &ssl, &server_fd,
-                         mbedtls_net_send, mbedtls_net_recv, mbedtls_net_recv_timeout );
+#if !defined(MBEDTLS_SSL_CONF_RECV) && \
+    !defined(MBEDTLS_SSL_CONF_SEND) && \
+    !defined(MBEDTLS_SSL_CONF_RECV_TIMEOUT)
+    mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
+#else
+     mbedtls_ssl_set_bio_ctx( &ssl, &server_fd );
+#endif
 
     mbedtls_ssl_set_timer_cb( &ssl, &timer, mbedtls_timing_set_delay,
                                             mbedtls_timing_get_delay );