Corrected allocation check
[gnutls.git] / doc / examples / ex-client-resume.c
blobc09495007c25b592b7198c4010b0b5f44d13ad7e
1 /* This example code is placed in the public domain. */
3 #ifdef HAVE_CONFIG_H
4 #include <config.h>
5 #endif
7 #include <string.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <gnutls/gnutls.h>
12 /* Those functions are defined in other examples.
14 extern void check_alert (gnutls_session_t session, int ret);
15 extern int tcp_connect (void);
16 extern void tcp_close (int sd);
18 #define MAX_BUF 1024
19 #define CAFILE "/etc/ssl/certs/ca-certificates.crt"
20 #define MSG "GET / HTTP/1.0\r\n\r\n"
22 int
23 main (void)
25 int ret;
26 int sd, ii;
27 gnutls_session_t session;
28 char buffer[MAX_BUF + 1];
29 gnutls_certificate_credentials_t xcred;
31 /* variables used in session resuming
33 int t;
34 char *session_data = NULL;
35 size_t session_data_size = 0;
37 gnutls_global_init ();
39 /* X509 stuff */
40 gnutls_certificate_allocate_credentials (&xcred);
42 gnutls_certificate_set_x509_trust_file (xcred, CAFILE, GNUTLS_X509_FMT_PEM);
44 for (t = 0; t < 2; t++)
45 { /* connect 2 times to the server */
47 sd = tcp_connect ();
49 gnutls_init (&session, GNUTLS_CLIENT);
51 gnutls_priority_set_direct (session, "PERFORMANCE:!ARCFOUR-128", NULL);
53 gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, xcred);
55 if (t > 0)
57 /* if this is not the first time we connect */
58 gnutls_session_set_data (session, session_data, session_data_size);
59 free (session_data);
62 gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
64 /* Perform the TLS handshake
68 ret = gnutls_handshake (session);
70 while (ret < 0 && gnutls_error_is_fatal (ret) == 0);
72 if (ret < 0)
74 fprintf (stderr, "*** Handshake failed\n");
75 gnutls_perror (ret);
76 goto end;
78 else
80 printf ("- Handshake was completed\n");
83 if (t == 0)
84 { /* the first time we connect */
85 /* get the session data size */
86 gnutls_session_get_data (session, NULL, &session_data_size);
87 session_data = malloc (session_data_size);
89 /* put session data to the session variable */
90 gnutls_session_get_data (session, session_data, &session_data_size);
93 else
94 { /* the second time we connect */
96 /* check if we actually resumed the previous session */
97 if (gnutls_session_is_resumed (session) != 0)
99 printf ("- Previous session was resumed\n");
101 else
103 fprintf (stderr, "*** Previous session was NOT resumed\n");
107 /* This function was defined in a previous example
109 /* print_info(session); */
111 gnutls_record_send (session, MSG, strlen (MSG));
113 ret = gnutls_record_recv (session, buffer, MAX_BUF);
114 if (ret == 0)
116 printf ("- Peer has closed the TLS connection\n");
117 goto end;
119 else if (ret < 0)
121 fprintf (stderr, "*** Error: %s\n", gnutls_strerror (ret));
122 goto end;
125 printf ("- Received %d bytes: ", ret);
126 for (ii = 0; ii < ret; ii++)
128 fputc (buffer[ii], stdout);
130 fputs ("\n", stdout);
132 gnutls_bye (session, GNUTLS_SHUT_RDWR);
134 end:
136 tcp_close (sd);
138 gnutls_deinit (session);
140 } /* for() */
142 gnutls_certificate_free_credentials (xcred);
144 gnutls_global_deinit ();
146 return 0;