1/*
2 * Copyright 2015-2017 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/*
11 * A minimal TLS server it ses SSL_CTX_config and a configuration file to
12 * set most server parameters.
13 */
14
15#include <stdio.h>
16#include <signal.h>
17#include <stdlib.h>
18#include <openssl/err.h>
19#include <openssl/ssl.h>
20#include <openssl/conf.h>
21
22int main(int argc, char *argv[])
23{
24    unsigned char buf[512];
25    char *port = "*:4433";
26    BIO *in = NULL;
27    BIO *ssl_bio, *tmp;
28    SSL_CTX *ctx;
29    int ret = EXIT_FAILURE, i;
30
31    ctx = SSL_CTX_new(TLS_server_method());
32
33    if (CONF_modules_load_file("cmod.cnf", "testapp", 0) <= 0) {
34        fprintf(stderr, "Error processing config file\n");
35        goto err;
36    }
37
38    if (SSL_CTX_config(ctx, "server") == 0) {
39        fprintf(stderr, "Error configuring server.\n");
40        goto err;
41    }
42
43    /* Setup server side SSL bio */
44    ssl_bio = BIO_new_ssl(ctx, 0);
45
46    if ((in = BIO_new_accept(port)) == NULL)
47        goto err;
48
49    /*
50     * This means that when a new connection is accepted on 'in', The ssl_bio
51     * will be 'duplicated' and have the new socket BIO push into it.
52     * Basically it means the SSL BIO will be automatically setup
53     */
54    BIO_set_accept_bios(in, ssl_bio);
55
56 again:
57    /*
58     * The first call will setup the accept socket, and the second will get a
59     * socket.  In this loop, the first actual accept will occur in the
60     * BIO_read() function.
61     */
62
63    if (BIO_do_accept(in) <= 0)
64        goto err;
65
66    for (;;) {
67        i = BIO_read(in, buf, sizeof(buf));
68        if (i == 0) {
69            /*
70             * If we have finished, remove the underlying BIO stack so the
71             * next time we call any function for this BIO, it will attempt
72             * to do an accept
73             */
74            printf("Done\n");
75            tmp = BIO_pop(in);
76            BIO_free_all(tmp);
77            goto again;
78        }
79        if (i < 0) {
80            if (BIO_should_retry(in))
81                continue;
82            goto err;
83        }
84        fwrite(buf, 1, i, stdout);
85        fflush(stdout);
86    }
87
88    ret = EXIT_SUCCESS;
89 err:
90    if (ret != EXIT_SUCCESS)
91        ERR_print_errors_fp(stderr);
92    BIO_free(in);
93    return ret;
94}
95