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