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