2 * Copyright 2013-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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
11 * A minimal program to serve an SSL connection. It uses blocking. It uses
12 * the SSL_CONF API with a configuration file. cc -I../../include saccept.c
13 * -L../.. -lssl -lcrypto -ldl
18 #include <openssl/err.h>
19 #include <openssl/ssl.h>
20 #include <openssl/conf.h>
22 int main(int argc, char *argv[])
24 char *port = "*:4433";
28 SSL_CONF_CTX *cctx = NULL;
30 STACK_OF(CONF_VALUE) *sect = NULL;
36 SSL_load_error_strings();
38 /* Add ciphers and message digests */
39 OpenSSL_add_ssl_algorithms();
41 conf = NCONF_new(NULL);
43 if (NCONF_load(conf, "accept.cnf", &errline) <= 0) {
45 fprintf(stderr, "Error processing config file\n");
47 fprintf(stderr, "Error on line %ld\n", errline);
51 sect = NCONF_get_section(conf, "default");
54 fprintf(stderr, "Error retrieving default section\n");
58 ctx = SSL_CTX_new(TLS_server_method());
59 cctx = SSL_CONF_CTX_new();
60 SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_SERVER);
61 SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CERTIFICATE);
62 SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_FILE);
63 SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
64 for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
66 cnf = sk_CONF_VALUE_value(sect, i);
67 rv = SSL_CONF_cmd(cctx, cnf->name, cnf->value);
71 fprintf(stderr, "Error processing %s = %s\n",
72 cnf->name, cnf->value);
73 ERR_print_errors_fp(stderr);
76 if (strcmp(cnf->name, "Port") == 0) {
79 fprintf(stderr, "Unknown configuration option %s\n", cnf->name);
84 if (!SSL_CONF_CTX_finish(cctx)) {
85 fprintf(stderr, "Finish error\n");
86 ERR_print_errors_fp(stderr);
90 /* Setup server side SSL bio */
91 ssl_bio = BIO_new_ssl(ctx, 0);
93 if ((in = BIO_new_accept(port)) == NULL)
97 * This means that when a new connection is accepted on 'in', The ssl_bio
98 * will be 'duplicated' and have the new socket BIO push into it.
99 * Basically it means the SSL BIO will be automatically setup
101 BIO_set_accept_bios(in, ssl_bio);
105 * The first call will setup the accept socket, and the second will get a
106 * socket. In this loop, the first actual accept will occur in the
107 * BIO_read() function.
110 if (BIO_do_accept(in) <= 0)
114 i = BIO_read(in, buf, 512);
117 * If we have finished, remove the underlying BIO stack so the
118 * next time we call any function for this BIO, it will attempt
127 if (BIO_should_retry(in))
131 fwrite(buf, 1, i, stdout);
138 ERR_print_errors_fp(stderr);