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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include "tls/s2n_connection.h"
#include "error/s2n_errno.h"
#include "utils/s2n_safety.h"
int s2n_blob_set_protocol_preferences(struct s2n_blob *application_protocols, const char *const *protocols, int protocol_count)
{
struct s2n_stuffer protocol_stuffer = {0};
GUARD(s2n_free(application_protocols));
if (protocols == NULL || protocol_count == 0) {
/* NULL value indicates no preference, so nothing to do */
return 0;
}
GUARD(s2n_stuffer_growable_alloc(&protocol_stuffer, 256));
for (int i = 0; i < protocol_count; i++) {
size_t length = strlen(protocols[i]);
uint8_t protocol[255];
S2N_ERROR_IF(length > 255 || (s2n_stuffer_data_available(&protocol_stuffer) + length + 1) > 65535, S2N_ERR_APPLICATION_PROTOCOL_TOO_LONG);
memcpy_check(protocol, protocols[i], length);
GUARD(s2n_stuffer_write_uint8(&protocol_stuffer, length));
GUARD(s2n_stuffer_write_bytes(&protocol_stuffer, protocol, length));
}
GUARD(s2n_stuffer_extract_blob(&protocol_stuffer, application_protocols));
GUARD(s2n_stuffer_free(&protocol_stuffer));
return 0;
}
int s2n_config_set_protocol_preferences(struct s2n_config *config, const char *const *protocols, int protocol_count)
{
return s2n_blob_set_protocol_preferences(&config->application_protocols, protocols, protocol_count);
}
int s2n_connection_set_protocol_preferences(struct s2n_connection *conn, const char * const *protocols, int protocol_count)
{
return s2n_blob_set_protocol_preferences(&conn->application_protocols_overridden, protocols, protocol_count);
}
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