1 files changed, 128 insertions, 0 deletions
diff --git a/lib/hello_ext_lib.c b/lib/hello_ext_lib.c
new file mode 100644
index 0000000..4f9b74d
--- /dev/null
+++ b/lib/hello_ext_lib.c
@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2017 Red Hat, Inc.
+ *
+ * Author: Nikos Mavrogiannopoulos
+ *
+ * This file is part of GnuTLS.
+ *
+ * The GnuTLS is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>
+ *
+ */
+
+/* Internal API functions to be used by extension handlers.
+ */
+
+#include "gnutls_int.h"
+#include "hello_ext.h"
+#include "hello_ext_lib.h"
+
+void _gnutls_hello_ext_default_deinit(gnutls_ext_priv_data_t priv)
+{
+	gnutls_free(priv);
+}
+
+/* When this is used, the deinitialization function must be set to default:
+ * _gnutls_hello_ext_default_deinit.
+ *
+ * This also prevents and errors on duplicate entries.
+ */
+int
+_gnutls_hello_ext_set_datum(gnutls_session_t session,
+			    extensions_t id, const gnutls_datum_t *data)
+{
+	gnutls_ext_priv_data_t epriv;
+
+	if (_gnutls_hello_ext_get_priv(session, id, &epriv) >= 0)
+		return gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
+
+	if (data->size >= UINT16_MAX)
+		return gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
+
+	epriv = gnutls_malloc(data->size+2);
+	if (epriv == NULL)
+		return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
+
+	_gnutls_write_uint16(data->size, epriv);
+	memcpy(((uint8_t*)epriv)+2, data->data, data->size);
+
+	_gnutls_hello_ext_set_priv(session, id, epriv);
+
+	return 0;
+}
+
+int
+_gnutls_hello_ext_get_datum(gnutls_session_t session,
+			    extensions_t id, gnutls_datum_t *data /* constant contents */)
+{
+	gnutls_ext_priv_data_t epriv;
+	int ret;
+
+	ret = _gnutls_hello_ext_get_priv(session, id, &epriv);
+	if (ret < 0 || epriv == NULL)
+		return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
+
+	data->size = _gnutls_read_uint16(epriv);
+	data->data = ((uint8_t*)epriv)+2;
+
+	return 0;
+}
+
+int
+_gnutls_hello_ext_get_resumed_datum(gnutls_session_t session,
+				    extensions_t id, gnutls_datum_t *data /* constant contents */)
+{
+	gnutls_ext_priv_data_t epriv;
+	int ret;
+
+	ret = _gnutls_hello_ext_get_resumed_priv(session, id, &epriv);
+	if (ret < 0 || epriv == NULL)
+		return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
+
+	data->size = _gnutls_read_uint16(epriv);
+	data->data = ((uint8_t*)epriv)+2;
+
+	return 0;
+}
+
+int
+_gnutls_hello_ext_default_pack(gnutls_ext_priv_data_t epriv, gnutls_buffer_st *ps)
+{
+	size_t size;
+
+	size = _gnutls_read_uint16(epriv);
+
+	return _gnutls_buffer_append_data(ps, epriv, size+2);
+}
+
+int
+_gnutls_hello_ext_default_unpack(gnutls_buffer_st *ps, gnutls_ext_priv_data_t *epriv)
+{
+	gnutls_datum_t data;
+	uint8_t *store;
+	int ret;
+
+	ret = _gnutls_buffer_pop_datum_prefix16(ps, &data);
+	if (ret < 0)
+		return gnutls_assert_val(ret);
+
+	store = gnutls_calloc(1, data.size+2);
+	if (store == NULL)
+		return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
+
+	_gnutls_write_uint16(data.size, store);
+	memcpy(store+2, data.data, data.size);
+
+	*epriv = store;
+	return 0;
+}