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 |

include/mbedtls/check_config.h

diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index 764fba4..29d9906 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -671,6 +671,18 @@
 #define "MBEDTLS_SSL_CONF_EXTENDED_MASTER_SECRET and MBEDTLS_SSL_CONF_ENFORCE_EXTENDED_MASTER_SECRET must be defined together."
 #endif
 
+#if ( defined(MBEDTLS_SSL_CONF_SEND) &&                 \
+      !( defined(MBEDTLS_SSL_CONF_RECV) &&              \
+         defined(MBEDTLS_SSL_CONF_RECV_TIMEOUT) ) ) ||  \
+    ( defined(MBEDTLS_SSL_CONF_RECV) &&                 \
+      !( defined(MBEDTLS_SSL_CONF_SEND) &&              \
+         defined(MBEDTLS_SSL_CONF_RECV_TIMEOUT) ) ) ||  \
+    ( defined(MBEDTLS_SSL_CONF_RECV_TIMEOUT) &&         \
+      !( defined(MBEDTLS_SSL_CONF_SEND) &&              \
+         defined(MBEDTLS_SSL_CONF_RECV) ) )
+#define "MBEDTLS_SSL_CONF_SEND/RECV/RECV_TIMEOUT must be defined simultaneously"
+#endif
+
 #if defined(MBEDTLS_SSL_TICKET_C) && !defined(MBEDTLS_CIPHER_C)
 #error "MBEDTLS_SSL_TICKET_C defined, but not all prerequisites"
 #endif