2 * Copyright 2013-2017 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
20 #include <openssl/err.h>
21 #include <openssl/ssl.h>
22 #include <openssl/conf.h>
24 int main(int argc, char *argv[])
26 char *port = "*:4433";
30 SSL_CONF_CTX *cctx = NULL;
32 STACK_OF(CONF_VALUE) *sect = NULL;
36 int ret = EXIT_FAILURE, i;
38 ctx = SSL_CTX_new(TLS_server_method());
40 conf = NCONF_new(NULL);
42 if (NCONF_load(conf, "accept.cnf", &errline) <= 0) {
44 fprintf(stderr, "Error processing config file\n");
46 fprintf(stderr, "Error on line %ld\n", errline);
50 sect = NCONF_get_section(conf, "default");
53 fprintf(stderr, "Error retrieving default section\n");
57 cctx = SSL_CONF_CTX_new();
58 SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_SERVER);
59 SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_CERTIFICATE);
60 SSL_CONF_CTX_set_flags(cctx, SSL_CONF_FLAG_FILE);
61 SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
62 for (i = 0; i < sk_CONF_VALUE_num(sect); i++) {
64 cnf = sk_CONF_VALUE_value(sect, i);
65 rv = SSL_CONF_cmd(cctx, cnf->name, cnf->value);
69 fprintf(stderr, "Error processing %s = %s\n",
70 cnf->name, cnf->value);
71 ERR_print_errors_fp(stderr);
74 if (strcmp(cnf->name, "Port") == 0) {
77 fprintf(stderr, "Unknown configuration option %s\n", cnf->name);
82 if (!SSL_CONF_CTX_finish(cctx)) {
83 fprintf(stderr, "Finish error\n");
84 ERR_print_errors_fp(stderr);
88 /* Setup server side SSL bio */
89 ssl_bio = BIO_new_ssl(ctx, 0);
91 if ((in = BIO_new_accept(port)) == NULL)
95 * This means that when a new connection is accepted on 'in', The ssl_bio
96 * will be 'duplicated' and have the new socket BIO push into it.
97 * Basically it means the SSL BIO will be automatically setup
99 BIO_set_accept_bios(in, ssl_bio);
103 * The first call will setup the accept socket, and the second will get a
104 * socket. In this loop, the first actual accept will occur in the
105 * BIO_read() function.
108 if (BIO_do_accept(in) <= 0)
112 i = BIO_read(in, buf, 512);
115 * If we have finished, remove the underlying BIO stack so the
116 * next time we call any function for this BIO, it will attempt
125 if (BIO_should_retry(in))
129 fwrite(buf, 1, i, stdout);
135 if (ret != EXIT_SUCCESS)
136 ERR_print_errors_fp(stderr);