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server-cmod.c revision 1.1 
      1 /*
      2  * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      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
      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 <openssl/err.h>
     18 #include <openssl/ssl.h>
     19 #include <openssl/conf.h>
     20 
     21 int main(int argc, char *argv[])
     22 {
     23     unsigned char buf[512];
     24     char *port = "*:4433";
     25     BIO *in = NULL;
     26     BIO *ssl_bio, *tmp;
     27     SSL_CTX *ctx;
     28     int ret = 1, i;
     29 
     30     ctx = SSL_CTX_new(TLS_server_method());
     31 
     32     if (CONF_modules_load_file("cmod.cnf", "testapp", 0) <= 0) {
     33         fprintf(stderr, "Error processing config file\n");
     34         goto err;
     35     }
     36 
     37     if (SSL_CTX_config(ctx, "server") == 0) {
     38         fprintf(stderr, "Error configuring server.\n");
     39         goto err;
     40     }
     41 
     42     /* Setup server side SSL bio */
     43     ssl_bio = BIO_new_ssl(ctx, 0);
     44 
     45     if ((in = BIO_new_accept(port)) == NULL)
     46         goto err;
     47 
     48     /*
     49      * This means that when a new connection is accepted on 'in', The ssl_bio
     50      * will be 'duplicated' and have the new socket BIO push into it.
     51      * Basically it means the SSL BIO will be automatically setup
     52      */
     53     BIO_set_accept_bios(in, ssl_bio);
     54 
     55  again:
     56     /*
     57      * The first call will setup the accept socket, and the second will get a
     58      * socket.  In this loop, the first actual accept will occur in the
     59      * BIO_read() function.
     60      */
     61 
     62     if (BIO_do_accept(in) <= 0)
     63         goto err;
     64 
     65     for (;;) {
     66         i = BIO_read(in, buf, sizeof(buf));
     67         if (i == 0) {
     68             /*
     69              * If we have finished, remove the underlying BIO stack so the
     70              * next time we call any function for this BIO, it will attempt
     71              * to do an accept
     72              */
     73             printf("Done\n");
     74             tmp = BIO_pop(in);
     75             BIO_free_all(tmp);
     76             goto again;
     77         }
     78         if (i < 0) {
     79             if (BIO_should_retry(in))
     80                 continue;
     81             goto err;
     82         }
     83         fwrite(buf, 1, i, stdout);
     84         fflush(stdout);
     85     }
     86 
     87     ret = 0;
     88  err:
     89     if (ret) {
     90         ERR_print_errors_fp(stderr);
     91     }
     92     BIO_free(in);
     93     exit(ret);
     94     return (!ret);
     95 }
     96