tests/finished.c

   1 /*
   2  * Copyright (C) 2008, 2010 Free Software Foundation, Inc.
   3  *
   4  * Author: Simon Josefsson
   5  *
   6  * This file is part of GNUTLS.
   7  *
   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.
  12  *
  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.
  17  *
  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
  21  */
  22
  23 /* Based on mini.c. */
  24
  25 #ifdef HAVE_CONFIG_H
  26 # include <config.h>
  27 #endif
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <errno.h>
  33 #include <gnutls/gnutls.h>
  34
  35 #include "utils.h"
  36
  37 static void
  38 tls_log_func (int level, const char *str)
  39 {
  40   fprintf (stderr, "|<%d>| %s", level, str);
  41 }
  42
  43 char *to_server;
  44 size_t to_server_len;
  45
  46 char *to_client;
  47 size_t to_client_len;
  48
  49 static ssize_t
  50 client_pull (gnutls_transport_ptr_t tr, void *data, size_t len)
  51 {
  52   success ("client_pull len %d has %d\n", (int)len, (int)to_client_len);
  53
  54   if (to_client_len < len)
  55     {
  56       gnutls_transport_set_global_errno (EAGAIN);
  57       return -1;
  58     }
  59
  60   memcpy (data, to_client, len);
  61
  62   memmove (to_client, to_client + len, to_client_len - len);
  63   to_client_len -= len;
  64
  65   return len;
  66 }
  67
  68 static ssize_t
  69 client_push (gnutls_transport_ptr_t tr, const void *data, size_t len)
  70 {
  71   size_t newlen = to_server_len + len;
  72   char *tmp;
  73
  74   success ("client_push len %d has %d\n", (int)len, (int)to_server_len);
  75   hexprint (data, len);
  76
  77   tmp = realloc (to_server, newlen);
  78   if (!tmp)
  79     {
  80       fail ("Memory allocation failure...\n");
  81       exit (1);
  82     }
  83   to_server = tmp;
  84
  85   memcpy (to_server + to_server_len, data, len);
  86   to_server_len = newlen;
  87
  88   return len;
  89 }
  90
  91 static ssize_t
  92 server_pull (gnutls_transport_ptr_t tr, void *data, size_t len)
  93 {
  94   success ("server_pull len %d has %d\n", (int)len, (int)to_server_len);
  95
  96   if (to_server_len < len)
  97     {
  98       gnutls_transport_set_global_errno (EAGAIN);
  99       return -1;
 100     }
 101
 102   memcpy (data, to_server, len);
 103
 104   memmove (to_server, to_server + len, to_server_len - len);
 105   to_server_len -= len;
 106
 107   return len;
 108 }
 109
 110 static ssize_t
 111 server_push (gnutls_transport_ptr_t tr, const void *data, size_t len)
 112 {
 113   size_t newlen = to_client_len + len;
 114   char *tmp;
 115
 116   success ("server_push len %d has %d\n", (int)len, (int)to_client_len);
 117
 118   hexprint (data, len);
 119
 120   tmp = realloc (to_client, newlen);
 121   if (!tmp)
 122     {
 123       fail ("Memory allocation failure...\n");
 124       exit (1);
 125     }
 126   to_client = tmp;
 127
 128   memcpy (to_client + to_client_len, data, len);
 129   to_client_len = newlen;
 130
 131   return len;
 132 }
 133
 134 static void
 135 client_finished_callback (gnutls_session_t session,
 136                           const void *finished, size_t len)
 137 {
 138   success ("client finished (length %d)\n", (int)len);
 139   hexprint (finished, len);
 140 }
 141
 142 static void
 143 server_finished_callback (gnutls_session_t session,
 144                           const void *finished, size_t len)
 145 {
 146   success ("server finished (length %d)\n", (int)len);
 147   hexprint (finished, len);
 148 }
 149
 150 #define MAX_BUF 1024
 151 #define MSG "Hello TLS"
 152
 153 void
 154 doit (void)
 155 {
 156   /* Server stuff. */
 157   gnutls_anon_server_credentials_t s_anoncred;
 158   const gnutls_datum_t p3 = { (char *) pkcs3, strlen (pkcs3) };
 159   static gnutls_dh_params_t dh_params;
 160   gnutls_session_t server;
 161   int sret = GNUTLS_E_AGAIN;
 162   /* Client stuff. */
 163   gnutls_anon_client_credentials_t c_anoncred;
 164   gnutls_session_t client;
 165   int n, cret = GNUTLS_E_AGAIN;
 166   /* Need to enable anonymous KX specifically. */
 167   const int kx_prio[] = { GNUTLS_KX_ANON_DH, 0 };
 168   char buffer[MAX_BUF + 1];
 169   ssize_t ns;
 170   int ret;
 171
 172   /* General init. */
 173   gnutls_global_init ();
 174   gnutls_global_set_log_function (tls_log_func);
 175   if (debug)
 176     gnutls_global_set_log_level (4711);
 177
 178   /* Init server */
 179   gnutls_anon_allocate_server_credentials (&s_anoncred);
 180   gnutls_dh_params_init (&dh_params);
 181   gnutls_dh_params_import_pkcs3 (dh_params, &p3, GNUTLS_X509_FMT_PEM);
 182   gnutls_anon_set_server_dh_params (s_anoncred, dh_params);
 183   gnutls_init (&server, GNUTLS_SERVER);
 184   gnutls_set_default_priority (server);
 185   gnutls_kx_set_priority (server, kx_prio);
 186   gnutls_credentials_set (server, GNUTLS_CRD_ANON, s_anoncred);
 187   gnutls_dh_set_prime_bits (server, 1024);
 188   gnutls_transport_set_push_function (server, server_push);
 189   gnutls_transport_set_pull_function (server, server_pull);
 190   gnutls_session_set_finished_function (server, server_finished_callback);
 191
 192   /* Init client */
 193   gnutls_anon_allocate_client_credentials (&c_anoncred);
 194   gnutls_init (&client, GNUTLS_CLIENT);
 195   gnutls_set_default_priority (client);
 196   gnutls_kx_set_priority (client, kx_prio);
 197   gnutls_credentials_set (client, GNUTLS_CRD_ANON, c_anoncred);
 198   gnutls_transport_set_push_function (client, client_push);
 199   gnutls_transport_set_pull_function (client, client_pull);
 200   gnutls_session_set_finished_function (client, client_finished_callback);
 201
 202   do
 203     {
 204       if (cret == GNUTLS_E_AGAIN)
 205         {
 206           success ("loop invoking client:\n");
 207           cret = gnutls_handshake (client);
 208           success ("client %d: %s\n", cret, gnutls_strerror (cret));
 209         }
 210
 211       if (sret == GNUTLS_E_AGAIN)
 212         {
 213           success ("loop invoking server:\n");
 214           sret = gnutls_handshake (server);
 215           success ("server %d: %s\n", sret, gnutls_strerror (sret));
 216         }
 217     }
 218   while (cret == GNUTLS_E_AGAIN || sret == GNUTLS_E_AGAIN);
 219
 220   success ("Handshake established\n");
 221
 222   ns = gnutls_record_send (client, MSG, strlen (MSG));
 223   success ("client: sent %d\n", (int)ns);
 224
 225   ret = gnutls_record_recv (server, buffer, MAX_BUF);
 226   if (ret == 0)
 227     fail ("server: didn't receive any data\n");
 228   else if (ret < 0)
 229     fail ("server: error: %s\n", gnutls_strerror (ret));
 230   else
 231     {
 232       printf ("server: received %d: ", ret);
 233       for (n = 0; n < ret; n++)
 234         fputc (buffer[n], stdout);
 235       fputs ("\n", stdout);
 236     }
 237
 238   ns = gnutls_record_send (server, MSG, strlen (MSG));
 239   success ("server: sent %d\n", (int)ns);
 240
 241   ret = gnutls_record_recv (client, buffer, MAX_BUF);
 242   if (ret == 0)
 243     {
 244       fail ("client: Peer has closed the TLS connection\n");
 245     }
 246   else if (ret < 0)
 247     {
 248       fail ("client: Error: %s\n", gnutls_strerror (ret));
 249     }
 250   else
 251     {
 252       printf ("client: received %d: ", ret);
 253       for (n = 0; n < ret; n++)
 254         fputc (buffer[n], stdout);
 255       fputs ("\n", stdout);
 256     }
 257
 258   gnutls_bye (client, GNUTLS_SHUT_RDWR);
 259   gnutls_bye (server, GNUTLS_SHUT_RDWR);
 260
 261   gnutls_deinit (client);
 262   gnutls_deinit (server);
 263
 264   free (to_server);
 265   free (to_client);
 266
 267   gnutls_anon_free_client_credentials (c_anoncred);
 268   gnutls_anon_free_server_credentials (s_anoncred);
 269
 270   gnutls_dh_params_deinit (dh_params);
 271
 272   gnutls_global_deinit ();
 273 }