Support TLS_FALLBACK_SCSV.

[openssl.git] / apps / s_client.c

diff --git a/apps/s_client.c b/apps/s_client.c
index ffd3a4b50f3d8668243c36e904e13db48cc2469e..80ee42aea626b92c2fa32aa74780ca33c16c2e6f 100644 (file)
--- a/apps/s_client.c
+++ b/apps/s_client.c
@@ -343,6 +343,7 @@ static void sc_usage(void)
        BIO_printf(bio_err," -tls1_1       - just use TLSv1.1\n");
        BIO_printf(bio_err," -tls1         - just use TLSv1\n");
        BIO_printf(bio_err," -dtls1        - just use DTLSv1\n");    
+       BIO_printf(bio_err," -fallback_scsv - send TLS_FALLBACK_SCSV\n");
        BIO_printf(bio_err," -mtu          - set the link layer MTU\n");
        BIO_printf(bio_err," -no_tls1_2/-no_tls1_1/-no_tls1/-no_ssl3/-no_ssl2 - turn off that protocol\n");
        BIO_printf(bio_err," -bugs         - Switch on all SSL implementation bug workarounds\n");
@@ -649,6 +650,7 @@ int MAIN(int argc, char **argv)
        char *sess_out = NULL;
        struct sockaddr peer;
        int peerlen = sizeof(peer);
+       int fallback_scsv = 0;
        int enable_timeouts = 0 ;
        long socket_mtu = 0;
 #ifndef OPENSSL_NO_JPAKE
@@ -925,6 +927,10 @@ static char *jpake_secret = NULL;
                        meth=DTLSv1_2_client_method();
                        socket_type=SOCK_DGRAM;
                        }
+               else if (strcmp(*argv,"-fallback_scsv") == 0)
+                       {
+                       fallback_scsv = 1;
+                       }
                else if (strcmp(*argv,"-timeout") == 0)
                        enable_timeouts=1;
                else if (strcmp(*argv,"-mtu") == 0)
@@ -1415,6 +1421,10 @@ bad:
                SSL_set_session(con, sess);
                SSL_SESSION_free(sess);
                }
+
+       if (fallback_scsv)
+               SSL_set_mode(con, SSL_MODE_SEND_FALLBACK_SCSV);
+
 #ifndef OPENSSL_NO_TLSEXT
        if (servername != NULL)
                {