New test app for dynamic loading of libmbed* with dlopen
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/programs/test/dlopen.c b/programs/test/dlopen.c
new file mode 100644
index 0000000..e770c39
--- /dev/null
+++ b/programs/test/dlopen.c
@@ -0,0 +1,102 @@
+/*
+ * Test dynamic loading of libmbed*
+ *
+ * Copyright The Mbed TLS Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "mbedtls/config.h"
+
+#include "mbedtls/platform.h"
+#if !defined(MBEDTLS_PLATFORM_C)
+#include <stdio.h>
+#include <stdlib.h>
+#define mbedtls_fprintf fprintf
+#define mbedtls_printf printf
+#define mbedtls_exit exit
+#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
+#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+#include "mbedtls/x509_crt.h"
+#endif
+
+#define CRYPTO_SO_FILENAME "libmbedcrypto.so"
+#define X509_SO_FILENAME "libmbedx509.so"
+#define TLS_SO_FILENAME "libmbedtls.so"
+
+#include <dlfcn.h>
+
+#define CHECK_DLERROR( function, argument ) \
+ do \
+ { \
+ char *CHECK_DLERROR_error = dlerror ( ); \
+ if( CHECK_DLERROR_error != NULL ) \
+ { \
+ fprintf( stderr, "Dynamic loading error for %s(%s): %s\n", \
+ function, argument, CHECK_DLERROR_error ); \
+ mbedtls_exit( MBEDTLS_EXIT_FAILURE ); \
+ } \
+ } \
+ while( 0 )
+
+int main( void )
+{
+ unsigned n;
+
+#if defined(MBEDTLS_SSL_TLS_C)
+ void *tls_so = dlopen( TLS_SO_FILENAME, RTLD_NOW );
+ CHECK_DLERROR( "dlopen", TLS_SO_FILENAME );
+ const int *( *ssl_list_ciphersuites )( void ) =
+ dlsym( tls_so, "mbedtls_ssl_list_ciphersuites" );
+ CHECK_DLERROR( "dlsym", "mbedtls_ssl_list_ciphersuites" );
+ const int *ciphersuites = ssl_list_ciphersuites( );
+ for( n = 0; ciphersuites[n] != 0; n++ )
+ /* nothing to do, we're just counting */;
+ mbedtls_printf( "%u ciphersuites\n", n );
+ dlclose( tls_so );
+ CHECK_DLERROR( "dlclose", TLS_SO_FILENAME );
+#endif /* MBEDTLS_SSL_TLS_C */
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C)
+ void *x509_so = dlopen( X509_SO_FILENAME, RTLD_NOW );
+ CHECK_DLERROR( "dlopen", X509_SO_FILENAME );
+ const mbedtls_x509_crt_profile *profile =
+ dlsym( x509_so, "mbedtls_x509_crt_profile_default" );
+ CHECK_DLERROR( "dlsym", "mbedtls_x509_crt_profile_default" );
+ mbedtls_printf( "Allowed md mask: %08x\n",
+ (unsigned) profile->allowed_mds );
+ dlclose( x509_so );
+ CHECK_DLERROR( "dlclose", X509_SO_FILENAME );
+#endif /* MBEDTLS_X509_CRT_PARSE_C */
+
+#if defined(MBEDTLS_MD_C)
+ void *crypto_so = dlopen( CRYPTO_SO_FILENAME, RTLD_NOW );
+ CHECK_DLERROR( "dlopen", CRYPTO_SO_FILENAME );
+ const int *( *md_list )( void ) =
+ dlsym( crypto_so, "mbedtls_md_list" );
+ CHECK_DLERROR( "dlsym", "mbedtls_md_list" );
+ const int *mds = md_list( );
+ for( n = 0; mds[n] != 0; n++ )
+ /* nothing to do, we're just counting */;
+ mbedtls_printf( "%u hashes\n", n );
+ dlclose( crypto_so );
+ CHECK_DLERROR( "dlclose", CRYPTO_SO_FILENAME );
+#endif /* MBEDTLS_MD_C */
+
+ return( 0 );
+}
+