Add accessor to retrieve SNI during handshake

Signed-off-by: Glenn Strauss <gstrauss@gluelogic.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 089f239..2220721 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -1389,6 +1389,13 @@
 #endif /* MBEDTLS_X509_CRT_PARSE_C */
 
 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
+const unsigned char *mbedtls_ssl_get_hs_sni( mbedtls_ssl_context *ssl,
+                                             size_t *name_len )
+{
+    *name_len = ssl->handshake->sni_name_len;
+    return( ssl->handshake->sni_name );
+}
+
 int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl,
                                  mbedtls_x509_crt *own_cert,
                                  mbedtls_pk_context *pk_key )