/*

 * Copyright 2015-2017 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

/*

 * A minimal TLS server it ses SSL_CTX_config and a configuration file to

 * set most server parameters.

 */

#include <stdio.h>

#include <signal.h>

#include <stdlib.h>

#include <openssl/err.h>

#include <openssl/ssl.h>

#include <openssl/conf.h>

int main(int argc, char *argv[])

{

    unsigned char buf[512];

    char *port = "*:4433";

    BIO *in = NULL;

    BIO *ssl_bio, *tmp;

    SSL_CTX *ctx;

    int ret = EXIT_FAILURE, i;

    ctx = SSL_CTX_new(TLS_server_method());

    if (CONF_modules_load_file("cmod.cnf", "testapp", 0) <= 0) {

        fprintf(stderr, "Error processing config file\n");

        goto err;

    }

    if (SSL_CTX_config(ctx, "server") == 0) {

        fprintf(stderr, "Error configuring server.\n");

        goto err;

    }

    /* Setup server side SSL bio */

    ssl_bio = BIO_new_ssl(ctx, 0);

    if ((in = BIO_new_accept(port)) == NULL)

        goto err;

    /*

     * This means that when a new connection is accepted on 'in', The ssl_bio

     * will be 'duplicated' and have the new socket BIO push into it.

     * Basically it means the SSL BIO will be automatically setup

     */

    BIO_set_accept_bios(in, ssl_bio);

 again:

    /*

     * The first call will setup the accept socket, and the second will get a

     * socket.  In this loop, the first actual accept will occur in the

     * BIO_read() function.

     */

    if (BIO_do_accept(in) <= 0)

        goto err;

    for (;;) {

        i = BIO_read(in, buf, sizeof(buf));

        if (i == 0) {

            /*

             * If we have finished, remove the underlying BIO stack so the

             * next time we call any function for this BIO, it will attempt

             * to do an accept

             */

            printf("Done\n");

            tmp = BIO_pop(in);

            BIO_free_all(tmp);

            goto again;

        }

        if (i < 0) {

            if (BIO_should_retry(in))

                continue;

            goto err;

        }

        fwrite(buf, 1, i, stdout);

        fflush(stdout);

    }

    ret = EXIT_SUCCESS;

 err:

    if (ret != EXIT_SUCCESS)

        ERR_print_errors_fp(stderr);

    BIO_free(in);

    return ret;

}