1 /*
2 * Copyright 1998-2024 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 program to serve an SSL connection.
12 * It uses blocking.
13 * saccept host:port
14 * host is the interface IP to use. If any interface, use *:port
15 * The default it *:4433
16 *
17 * cc -I../../include saccept.c -L../.. -lssl -lcrypto -ldl
18 */
19
20 #include <stdio.h>
21 #include <signal.h>
22 #include <stdlib.h>
23 #include <openssl/err.h>
24 #include <openssl/ssl.h>
25
26 #define CERT_FILE "server.pem"
27
28 static volatile int done = 0;
29
interrupt(int sig)30 static void interrupt(int sig)
31 {
32 done = 1;
33 }
34
sigsetup(void)35 static void sigsetup(void)
36 {
37 #if defined(OPENSSL_SYS_WINDOWS)
38 signal(SIGINT, interrupt);
39 #else
40 struct sigaction sa;
41
42 /*
43 * Catch at most once, and don't restart the accept system call.
44 */
45 sa.sa_flags = SA_RESETHAND;
46 sa.sa_handler = interrupt;
47 sigemptyset(&sa.sa_mask);
48 sigaction(SIGINT, &sa, NULL);
49 #endif
50 }
51
main(int argc,char * argv[])52 int main(int argc, char *argv[])
53 {
54 char *port = NULL;
55 BIO *in = NULL;
56 BIO *ssl_bio, *tmp;
57 SSL_CTX *ctx;
58 char buf[512];
59 int ret = EXIT_FAILURE, i;
60
61 if (argc <= 1)
62 port = "*:4433";
63 else
64 port = argv[1];
65
66 ctx = SSL_CTX_new(TLS_server_method());
67 if (!SSL_CTX_use_certificate_chain_file(ctx, CERT_FILE))
68 goto err;
69 if (!SSL_CTX_use_PrivateKey_file(ctx, CERT_FILE, SSL_FILETYPE_PEM))
70 goto err;
71 if (!SSL_CTX_check_private_key(ctx))
72 goto err;
73
74 /* Setup server side SSL bio */
75 ssl_bio = BIO_new_ssl(ctx, 0);
76
77 if ((in = BIO_new_accept(port)) == NULL)
78 goto err;
79
80 /*
81 * This means that when a new connection is accepted on 'in', The ssl_bio
82 * will be 'duplicated' and have the new socket BIO push into it.
83 * Basically it means the SSL BIO will be automatically setup
84 */
85 BIO_set_accept_bios(in, ssl_bio);
86
87 /* Arrange to leave server loop on interrupt */
88 sigsetup();
89
90 again:
91 /*
92 * The first call will setup the accept socket, and the second will get a
93 * socket. In this loop, the first actual accept will occur in the
94 * BIO_read() function.
95 */
96
97 if (BIO_do_accept(in) <= 0)
98 goto err;
99
100 while (!done) {
101 i = BIO_read(in, buf, 512);
102 if (i == 0) {
103 /*
104 * If we have finished, remove the underlying BIO stack so the
105 * next time we call any function for this BIO, it will attempt
106 * to do an accept
107 */
108 printf("Done\n");
109 tmp = BIO_pop(in);
110 BIO_free_all(tmp);
111 goto again;
112 }
113 if (i < 0)
114 goto err;
115 fwrite(buf, 1, i, stdout);
116 fflush(stdout);
117 }
118
119 ret = EXIT_SUCCESS;
120 err:
121 if (ret != EXIT_SUCCESS)
122 ERR_print_errors_fp(stderr);
123 BIO_free(in);
124 return ret;
125 }
126
