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      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 
     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