2 * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation
4 * Author: Simon Josefsson
6 * This file is part of GNUTLS.
8 * GNUTLS is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
13 * GNUTLS is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with GNUTLS; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
23 /* Parts copied from GnuTLS example programs. */
32 #include <sys/types.h>
33 #include <netinet/in.h>
34 #include <sys/socket.h>
36 #include <arpa/inet.h>
38 #include <gnutls/gnutls.h>
45 tls_log_func (int level
, const char *str
)
47 fprintf (stderr
, "|<%d>| %s", level
, str
);
50 /* A very basic TLS client, with anonymous authentication.
54 #define MSG "Hello TLS"
60 gnutls_session_t session
;
61 char buffer
[MAX_BUF
+ 1];
62 gnutls_anon_client_credentials_t anoncred
;
63 /* Need to enable anonymous KX specifically. */
64 const int kx_prio
[] = { GNUTLS_KX_ANON_DH
, 0 };
66 gnutls_global_init ();
68 gnutls_global_set_log_function (tls_log_func
);
70 gnutls_global_set_log_level (4711);
72 gnutls_anon_allocate_client_credentials (&anoncred
);
74 /* Initialize TLS session
76 gnutls_init (&session
, GNUTLS_CLIENT
);
78 /* Use default priorities */
79 gnutls_set_default_priority (session
);
80 gnutls_kx_set_priority (session
, kx_prio
);
82 /* put the anonymous credentials to the current session
84 gnutls_credentials_set (session
, GNUTLS_CRD_ANON
, anoncred
);
86 /* connect to the peer
90 gnutls_transport_set_ptr (session
, (gnutls_transport_ptr_t
) sd
);
92 /* Perform the TLS handshake
94 ret
= gnutls_handshake (session
);
98 fail ("client: Handshake failed\n");
104 success ("client: Handshake was completed\n");
107 success ("client: TLS version is: %s\n",
108 gnutls_protocol_get_name (gnutls_protocol_get_version (session
)));
110 gnutls_record_send (session
, MSG
, strlen (MSG
));
112 ret
= gnutls_record_recv (session
, buffer
, MAX_BUF
);
115 success ("client: Peer has closed the TLS connection\n");
120 fail ("client: Error: %s\n", gnutls_strerror (ret
));
124 printf ("- Received %d bytes: ", ret
);
125 for (ii
= 0; ii
< ret
; ii
++)
127 fputc (buffer
[ii
], stdout
);
129 fputs ("\n", stdout
);
131 gnutls_bye (session
, GNUTLS_SHUT_RDWR
);
137 gnutls_deinit (session
);
139 gnutls_anon_free_client_credentials (anoncred
);
141 gnutls_global_deinit ();
144 /* This is a sample TLS 1.0 echo server, for anonymous authentication only.
147 #define SA struct sockaddr
149 #define PORT 5556 /* listen to 5556 port */
152 /* These are global */
153 gnutls_anon_server_credentials_t anoncred
;
155 static gnutls_session_t
156 initialize_tls_session (void)
158 gnutls_session_t session
;
159 const int kx_prio
[] = { GNUTLS_KX_ANON_DH
, 0 };
161 gnutls_init (&session
, GNUTLS_SERVER
);
163 /* avoid calling all the priority functions, since the defaults
166 gnutls_set_default_priority (session
);
167 gnutls_kx_set_priority (session
, kx_prio
);
169 gnutls_credentials_set (session
, GNUTLS_CRD_ANON
, anoncred
);
171 gnutls_dh_set_prime_bits (session
, DH_BITS
);
176 static gnutls_dh_params_t dh_params
;
179 generate_dh_params (void)
181 const gnutls_datum_t p3
= { (char*) pkcs3
, strlen (pkcs3
) };
182 /* Generate Diffie-Hellman parameters - for use with DHE
183 * kx algorithms. These should be discarded and regenerated
184 * once a day, once a week or once a month. Depending on the
185 * security requirements.
187 gnutls_dh_params_init (&dh_params
);
188 return gnutls_dh_params_import_pkcs3 (dh_params
, &p3
, GNUTLS_X509_FMT_PEM
);
191 int err
, listen_sd
, i
;
193 struct sockaddr_in sa_serv
;
194 struct sockaddr_in sa_cli
;
197 gnutls_session_t session
;
198 char buffer
[MAX_BUF
+ 1];
206 listen_sd
= socket (AF_INET
, SOCK_STREAM
, 0);
210 fail ("server: socket failed\n");
214 memset (&sa_serv
, '\0', sizeof (sa_serv
));
215 sa_serv
.sin_family
= AF_INET
;
216 sa_serv
.sin_addr
.s_addr
= INADDR_ANY
;
217 sa_serv
.sin_port
= htons (PORT
); /* Server Port number */
219 setsockopt (listen_sd
, SOL_SOCKET
, SO_REUSEADDR
, (void *) &optval
, sizeof (int));
221 err
= bind (listen_sd
, (SA
*) & sa_serv
, sizeof (sa_serv
));
225 fail ("server: bind failed\n");
229 err
= listen (listen_sd
, 1024);
233 fail ("server: listen failed\n");
237 success ("server: ready. Listening to port '%d'.\n", PORT
);
243 /* this must be called once in the program
245 gnutls_global_init ();
247 gnutls_global_set_log_function (tls_log_func
);
249 gnutls_global_set_log_level (4711);
251 gnutls_anon_allocate_server_credentials (&anoncred
);
253 success ("Launched, generating DH parameters...\n");
255 generate_dh_params ();
257 gnutls_anon_set_server_dh_params (anoncred
, dh_params
);
259 client_len
= sizeof (sa_cli
);
261 session
= initialize_tls_session ();
263 sd
= accept (listen_sd
, (SA
*) & sa_cli
, &client_len
);
265 success ("server: connection from %s, port %d\n",
266 inet_ntop (AF_INET
, &sa_cli
.sin_addr
, topbuf
,
267 sizeof (topbuf
)), ntohs (sa_cli
.sin_port
));
269 gnutls_transport_set_ptr (session
, (gnutls_transport_ptr_t
) sd
);
270 ret
= gnutls_handshake (session
);
274 gnutls_deinit (session
);
275 fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret
));
278 success ("server: Handshake was completed\n");
280 success ("server: TLS version is: %s\n",
281 gnutls_protocol_get_name (gnutls_protocol_get_version (session
)));
283 /* see the Getting peer's information example */
284 /* print_info(session); */
289 memset (buffer
, 0, MAX_BUF
+ 1);
290 ret
= gnutls_record_recv (session
, buffer
, MAX_BUF
);
294 success ("server: Peer has closed the GNUTLS connection\n");
299 fail ("server: Received corrupted data(%d). Closing...\n", ret
);
304 /* echo data back to the client
306 gnutls_record_send (session
, buffer
, strlen (buffer
));
309 /* do not wait for the peer to close the connection.
311 gnutls_bye (session
, GNUTLS_SHUT_WR
);
314 gnutls_deinit (session
);
318 gnutls_anon_free_server_credentials (anoncred
);
320 gnutls_dh_params_deinit (dh_params
);
322 gnutls_global_deinit ();
324 success ("server: finished\n");