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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 "s2n.h"
int s2n_example_send(struct s2n_connection *conn, uint8_t *data, size_t data_size)
{
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
int bytes_written = 0;
while (bytes_written < data_size) {
int w = s2n_send(conn, data + bytes_written, data_size - bytes_written, &blocked);
if (w >= 0) {
/* `w` bytes were successfully sent. Update `bytes_written` so the next call to
* `s2n_send()` will send data from the correct offset in the buffer.
*/
bytes_written += w;
} else if (s2n_error_get_type(s2n_errno) == S2N_ERR_T_BLOCKED) {
/* The return of `s2n_send()` indicates an error. If this error is `S2N_ERR_T_BLOCKED`,
* the socket is blocked waiting to send more data.
*
* In a typical non-blocking environment, `poll()` or `select()` would be used re-enter
* `s2n_example_send()` and call `s2n_send()` again after the socket is ready to send
* more data. But this example just busy-waits, so we immediately call `s2n_send()`
* again.
*/
continue;
} else {
/* `s2n_send()` encountered an irrecoverable error. Log the error and return. */
fprintf(stderr, "Error: %s. %s\n", s2n_strerror(s2n_errno, NULL), s2n_strerror_debug(s2n_errno, NULL));
return -1;
}
}
return 0;
}
int s2n_example_sendv(struct s2n_connection *conn, uint8_t *data, size_t data_size)
{
struct iovec iov[1] = { 0 };
iov[0].iov_base = data;
iov[0].iov_len = data_size;
s2n_blocked_status blocked = S2N_NOT_BLOCKED;
int bytes_written = 0;
while (bytes_written < data_size) {
int w = s2n_sendv_with_offset(conn, iov, 1, bytes_written, &blocked);
if (w >= 0) {
bytes_written += w;
} else if (s2n_error_get_type(s2n_errno) != S2N_ERR_T_BLOCKED) {
fprintf(stderr, "Error: %s. %s\n", s2n_strerror(s2n_errno, NULL), s2n_strerror_debug(s2n_errno, NULL));
return -1;
}
}
return 0;
}
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