1 /*
2 * Copyright 2015-2025 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
main(int argc,char * argv[])22 int main(int argc, char *argv[])
23 {
24 unsigned char buf[512];
25 char *port = "*:4433";
26 BIO *in = NULL;
27 BIO *ssl_bio = NULL;
28 BIO *tmp;
29 SSL_CTX *ctx;
30 int ret = EXIT_FAILURE, i;
31
32 ctx = SSL_CTX_new(TLS_server_method());
33
34 if (CONF_modules_load_file("cmod.cnf", "testapp", 0) <= 0) {
35 fprintf(stderr, "Error processing config file\n");
36 goto err;
37 }
38
39 if (SSL_CTX_config(ctx, "server") == 0) {
40 fprintf(stderr, "Error configuring server.\n");
41 goto err;
42 }
43
44 /* Setup server side SSL bio */
45 ssl_bio = BIO_new_ssl(ctx, 0);
46
47 if ((in = BIO_new_accept(port)) == NULL)
48 goto err;
49
50 /*
51 * This means that when a new connection is accepted on 'in', The ssl_bio
52 * will be 'duplicated' and have the new socket BIO push into it.
53 * Basically it means the SSL BIO will be automatically setup
54 */
55 BIO_set_accept_bios(in, ssl_bio);
56 ssl_bio = NULL;
57
58 again:
59 /*
60 * The first call will setup the accept socket, and the second will get a
61 * socket. In this loop, the first actual accept will occur in the
62 * BIO_read() function.
63 */
64
65 if (BIO_do_accept(in) <= 0)
66 goto err;
67
68 for (;;) {
69 i = BIO_read(in, buf, sizeof(buf));
70 if (i == 0) {
71 /*
72 * If we have finished, remove the underlying BIO stack so the
73 * next time we call any function for this BIO, it will attempt
74 * to do an accept
75 */
76 printf("Done\n");
77 tmp = BIO_pop(in);
78 BIO_free_all(tmp);
79 goto again;
80 }
81 if (i < 0) {
82 if (BIO_should_retry(in))
83 continue;
84 goto err;
85 }
86 fwrite(buf, 1, i, stdout);
87 fflush(stdout);
88 }
89
90 ret = EXIT_SUCCESS;
91 err:
92 if (ret != EXIT_SUCCESS)
93 ERR_print_errors_fp(stderr);
94 BIO_free(in);
95 BIO_free_all(ssl_bio);
96 return ret;
97 }
98