Implement Maximum Fragment Length TLS extension.

Based on patch from Tomasz Moń:
https://groups.google.com/forum/#!topic/mailing.openssl.dev/fQxXvCg1uQY

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
(Merged from https://github.com/openssl/openssl/pull/1008)

1 files changed, 29 insertions, 0 deletions

diff --git a/test/ssl_test_ctx.c b/test/ssl_test_ctx.c
index 569aef0fa7..62417ac2c1 100644
--- a/test/ssl_test_ctx.c
+++ b/test/ssl_test_ctx.c
@@ -472,6 +472,34 @@ IMPLEMENT_SSL_TEST_INT_OPTION(SSL_TEST_CTX, test, app_data_size)
 
 IMPLEMENT_SSL_TEST_INT_OPTION(SSL_TEST_CTX, test, max_fragment_size)
 
+/* Maximum-Fragment-Length TLS extension mode */
+static const test_enum ssl_max_fragment_len_mode[] = {
+    {"None", TLSEXT_max_fragment_length_DISABLED},
+    { "512", TLSEXT_max_fragment_length_512},
+    {"1024", TLSEXT_max_fragment_length_1024},
+    {"2048", TLSEXT_max_fragment_length_2048},
+    {"4096", TLSEXT_max_fragment_length_4096}
+};
+
+__owur static int parse_max_fragment_len_mode(SSL_TEST_CLIENT_CONF *client_conf,
+                                              const char *value)
+{
+    int ret_value;
+
+    if (!parse_enum(ssl_max_fragment_len_mode,
+                    OSSL_NELEM(ssl_max_fragment_len_mode), &ret_value, value)) {
+        return 0;
+    }
+    client_conf->max_fragment_len_mode = ret_value;
+    return 1;
+}
+
+const char *ssl_max_fragment_len_name(int MFL_mode)
+{
+    return enum_name(ssl_max_fragment_len_mode,
+                     OSSL_NELEM(ssl_max_fragment_len_mode), MFL_mode);
+}
+
 
 /* Expected key and signature types */
 
@@ -639,6 +667,7 @@ static const ssl_test_client_option ssl_test_client_options[] = {
     { "RenegotiateCiphers", &parse_client_reneg_ciphers},
     { "SRPUser", &parse_client_srp_user },
     { "SRPPassword", &parse_client_srp_password },
+    { "MaxFragmentLenExt", &parse_max_fragment_len_mode },
 };
 
 /* Nested server options. */