bearSSL strict alpn clientside

bearssl/client/client.c

@@ -75,6 +75,7 @@ int main(int argc, char *argv[]) {
     alpn_ptr = malloc(sizeof(char) * strlen(alpn));
     alpn_ptr[0] = alpn;
     br_ssl_engine_set_protocol_names(&sc.eng, alpn_ptr, 1);
+    br_ssl_engine_add_flags(&sc.eng, BR_OPT_FAIL_ON_ALPN_MISMATCH);
 
     /*
 	 * Reset the client context, for a new handshake. We provide the
@@ -92,15 +93,7 @@ int main(int argc, char *argv[]) {
 
     /* Strict ALPN */
     const char *alpn_received = br_ssl_engine_get_selected_protocol(&sc.eng);
-    err = br_ssl_engine_last_error(&sc.eng);
-    if (alpn_received == NULL || strcmp(alpn_ptr[0], alpn_received) != 0) {
-        printf("Invalid ALPN received: %s\n", alpn_received);
-        //br_sslio_close(&ioc);
-        close(fd);
-        return 120;
-    } else {
-        printf("ALPN negotiatiated: %s\n", alpn_received);
-    }
+    printf("ALPN negotiatiated: %s\n", alpn_received);
 
     // send message to server
     //const char *message = "Hello from Client!";