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
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, *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