tests/openpgpself.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free Software
   3  * Foundation, Inc.
   4  *
   5  * Author: Simon Josefsson
   6  *
   7  * This file is part of GnuTLS.
   8  *
   9  * GnuTLS is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * GnuTLS is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with GnuTLS; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  22  */
  23
  24 /* Parts copied from GnuTLS example programs. */
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include <config.h>
  28 #endif
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <sys/types.h>
  34 #include <netinet/in.h>
  35 #include <sys/socket.h>
  36 #include <sys/wait.h>
  37 #include <arpa/inet.h>
  38 #include <unistd.h>
  39 #include <gnutls/gnutls.h>
  40 #include <gnutls/openpgp.h>
  41
  42 #include "utils.h"
  43
  44 #include "ex-session-info.c"
  45 #include "ex-x509-info.c"
  46 #include "tcp.c"
  47
  48 pid_t child;
  49
  50 static void
  51 tls_log_func (int level, const char *str)
  52 {
  53   fprintf (stderr, "%s |<%d>| %s", child ? "server" : "client", level, str);
  54 }
  55
  56 /* A very basic TLS client, with anonymous authentication.
  57  */
  58
  59 #define MAX_BUF 1024
  60 #define MSG "Hello TLS"
  61
  62 static unsigned char cert_txt[] =
  63   "-----BEGIN PGP PUBLIC KEY BLOCK-----\n"
  64   "Version: GnuPG v1.0.6 (GNU/Linux)\n"
  65   "Comment: For info see http://www.gnupg.org\n"
  66   "\n"
  67   "mQGiBDxnlY0RBACAsWUhi/goBvpvTBgL8fFPwBAuD04VYFEtC7+4pBp6kFsHjUR7\n"
  68   "TTUkBsOk2PvMHrDdv0+C4x2CH8YGP1e+O0f2yLWk8Uu+kkF12yiqbbvDEiCdeJT6\n"
  69   "c3vIstY8vJ9Jso5g/LB8Xggq88R7jXFS3hH+WC5v/6P6SARfzXl457cVewCgvxSf\n"
  70   "Gsm9mFospJ0B3RGyg5MB0d8D/RQQryJCGdR2nLe4VfctPL2QBD/1XhtubqEbetaV\n"
  71   "PxssqrJdA+eplBRT7UHokSBahM8gmSmNuSrLDujPfEtaMg6YIkB+Kq0VeJLE0cXT\n"
  72   "ZIH29KJlI/qk1xG4K7D6B0cKaHC/L4BIoKcQLJzfTIPw3frS4jVeNaQZNHSVqZ8/\n"
  73   "VmOMA/9rkNtccQ4RVd9WTFoHKvT4vfiISEOIzKGmcBY9Hymq7MCci3mNe4CDImkv\n"
  74   "ZgnjDlJAM91CX1ODthPLBqvyhnMhhxDnaDl4Nh42uPMSr9JEW2IwoIbFne10ihGT\n"
  75   "O4lBS1C28UfSGEMm/8JBMtxAjbYy3BYzUtCMA+bGBG6Voe5i5LQlRHIuIFdobyAo\n"
  76   "Tm8gY29tbWVudHMpIDx3aG9Ad2hvaXMub3JnPohdBBMRAgAdBQI8Z5WNBQkDwmcA\n"
  77   "BQsHCgMEAxUDAgMWAgECF4AACgkQNRRc6qfZPD+WWACfeJnLyfbpTDB7mDh3aATb\n"
  78   "+0PXz28AoKRdApBVM6Bty+vWyXH6HfF6ZTj+\n"
  79   "=m8dH\n" "-----END PGP PUBLIC KEY BLOCK-----\n";
  80 const gnutls_datum_t cert = { cert_txt, sizeof (cert_txt) };
  81
  82 static unsigned char key_txt[] =
  83   "-----BEGIN PGP PRIVATE KEY BLOCK-----\n"
  84   "Version: GnuPG v1.0.6 (GNU/Linux)\n"
  85   "Comment: For info see http://www.gnupg.org\n"
  86   "\n"
  87   "lQG7BDxnlY0RBACAsWUhi/goBvpvTBgL8fFPwBAuD04VYFEtC7+4pBp6kFsHjUR7\n"
  88   "TTUkBsOk2PvMHrDdv0+C4x2CH8YGP1e+O0f2yLWk8Uu+kkF12yiqbbvDEiCdeJT6\n"
  89   "c3vIstY8vJ9Jso5g/LB8Xggq88R7jXFS3hH+WC5v/6P6SARfzXl457cVewCgvxSf\n"
  90   "Gsm9mFospJ0B3RGyg5MB0d8D/RQQryJCGdR2nLe4VfctPL2QBD/1XhtubqEbetaV\n"
  91   "PxssqrJdA+eplBRT7UHokSBahM8gmSmNuSrLDujPfEtaMg6YIkB+Kq0VeJLE0cXT\n"
  92   "ZIH29KJlI/qk1xG4K7D6B0cKaHC/L4BIoKcQLJzfTIPw3frS4jVeNaQZNHSVqZ8/\n"
  93   "VmOMA/9rkNtccQ4RVd9WTFoHKvT4vfiISEOIzKGmcBY9Hymq7MCci3mNe4CDImkv\n"
  94   "ZgnjDlJAM91CX1ODthPLBqvyhnMhhxDnaDl4Nh42uPMSr9JEW2IwoIbFne10ihGT\n"
  95   "O4lBS1C28UfSGEMm/8JBMtxAjbYy3BYzUtCMA+bGBG6Voe5i5AAAnjMCLPrxGdgE\n"
  96   "I0xXdwCQ4Sh2diNECAj9JiM6RFNBX2ZhY3RvcjoAAK9cun7/j4AUMmdvIy5UMJph\n"
  97   "A6eq6atP/SYjOkRTQV9mYWN0b3I6AACvVjUuomodmmyCggPHWdeVSzpX3ODEHf0m\n"
  98   "IzpEU0FfZmFjdG9yOgAAr2Iv9H2aSH+vJKGYW/BO4ehQwwFck7u0JURyLiBXaG8g\n"
  99   "KE5vIGNvbW1lbnRzKSA8d2hvQHdob2lzLm9yZz6IXQQTEQIAHQUCPGeVjQUJA8Jn\n"
 100   "AAULBwoDBAMVAwIDFgIBAheAAAoJEDUUXOqn2Tw/llgAnjBPQdWxIqBCQGlcI2K/\n"
 101   "gLkZR1ARAJ9kaAeJYERc0bV/vlm0ot7UDdr+bQ==\n"
 102   "=4M0W\n" "-----END PGP PRIVATE KEY BLOCK-----\n";
 103 const gnutls_datum_t key = { key_txt, sizeof (key_txt) };
 104
 105 static void
 106 client (void)
 107 {
 108   int ret, sd, ii;
 109   gnutls_session_t session;
 110   char buffer[MAX_BUF + 1];
 111   gnutls_certificate_credentials_t xcred;
 112
 113   gnutls_global_init ();
 114
 115   gnutls_global_set_log_function (tls_log_func);
 116   if (debug)
 117     gnutls_global_set_log_level (2);
 118
 119   gnutls_certificate_allocate_credentials (&xcred);
 120
 121   /* sets the trusted cas file
 122    */
 123   if (debug)
 124     success ("Setting key files...\n");
 125
 126   ret = gnutls_certificate_set_openpgp_key_mem (xcred, &cert, &key,
 127                                                 GNUTLS_OPENPGP_FMT_BASE64);
 128   if (ret < 0)
 129     {
 130       fail ("Could not set key files...\n");
 131     }
 132
 133   /* Initialize TLS session
 134    */
 135   gnutls_init (&session, GNUTLS_CLIENT);
 136
 137   /* Use default priorities */
 138   gnutls_set_default_priority (session);
 139
 140   /* put the x509 credentials to the current session
 141    */
 142   gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, xcred);
 143
 144   /* connect to the peer
 145    */
 146   if (debug)
 147     success ("Connecting...\n");
 148   sd = tcp_connect ();
 149
 150   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 151
 152   /* Perform the TLS handshake
 153    */
 154   ret = gnutls_handshake (session);
 155
 156   if (ret < 0)
 157     {
 158       fail ("client: Handshake failed\n");
 159       gnutls_perror (ret);
 160       goto end;
 161     }
 162   else if (debug)
 163     {
 164       success ("client: Handshake was completed\n");
 165     }
 166
 167   if (debug)
 168     success ("client: TLS version is: %s\n",
 169              gnutls_protocol_get_name (gnutls_protocol_get_version
 170                                        (session)));
 171
 172   /* see the Getting peer's information example */
 173   if (debug)
 174     print_info (session);
 175
 176   gnutls_record_send (session, MSG, strlen (MSG));
 177
 178   ret = gnutls_record_recv (session, buffer, MAX_BUF);
 179   if (ret == 0)
 180     {
 181       if (debug)
 182         success ("client: Peer has closed the TLS connection\n");
 183       goto end;
 184     }
 185   else if (ret < 0)
 186     {
 187       fail ("client: Error: %s\n", gnutls_strerror (ret));
 188       goto end;
 189     }
 190
 191   if (debug)
 192     {
 193       printf ("- Received %d bytes: ", ret);
 194       for (ii = 0; ii < ret; ii++)
 195         {
 196           fputc (buffer[ii], stdout);
 197         }
 198       fputs ("\n", stdout);
 199     }
 200
 201   gnutls_bye (session, GNUTLS_SHUT_RDWR);
 202
 203 end:
 204
 205   tcp_close (sd);
 206
 207   gnutls_deinit (session);
 208
 209   gnutls_certificate_free_credentials (xcred);
 210
 211   gnutls_global_deinit ();
 212 }
 213
 214 /* This is a sample TLS 1.0 echo server, using X.509 authentication.
 215  */
 216
 217 #define SA struct sockaddr
 218 #define MAX_BUF 1024
 219 #define PORT 5556               /* listen to 5556 port */
 220 #define DH_BITS 1024
 221
 222 /* These are global */
 223 gnutls_certificate_credentials_t pgp_cred;
 224
 225 static gnutls_session_t
 226 initialize_tls_session (void)
 227 {
 228   gnutls_session_t session;
 229
 230   gnutls_init (&session, GNUTLS_SERVER);
 231
 232   /* avoid calling all the priority functions, since the defaults
 233    * are adequate.
 234    */
 235   gnutls_set_default_priority (session);
 236
 237   gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, pgp_cred);
 238
 239   /* request client certificate if any.
 240    */
 241   gnutls_certificate_server_set_request (session, GNUTLS_CERT_REQUEST);
 242
 243   gnutls_dh_set_prime_bits (session, DH_BITS);
 244
 245   return session;
 246 }
 247
 248 static gnutls_dh_params_t dh_params;
 249
 250 static int
 251 generate_dh_params (void)
 252 {
 253   const gnutls_datum_t p3 = { (char *) pkcs3, strlen (pkcs3) };
 254   /* Generate Diffie-Hellman parameters - for use with DHE
 255    * kx algorithms. These should be discarded and regenerated
 256    * once a day, once a week or once a month. Depending on the
 257    * security requirements.
 258    */
 259   gnutls_dh_params_init (&dh_params);
 260   return gnutls_dh_params_import_pkcs3 (dh_params, &p3, GNUTLS_X509_FMT_PEM);
 261 }
 262
 263 int err, listen_sd, i;
 264 int sd, ret;
 265 struct sockaddr_in sa_serv;
 266 struct sockaddr_in sa_cli;
 267 int client_len;
 268 char topbuf[512];
 269 gnutls_session_t session;
 270 char buffer[MAX_BUF + 1];
 271 int optval = 1;
 272
 273 static unsigned char server_crt_txt[] =
 274   "-----BEGIN PGP PUBLIC KEY BLOCK-----\n"
 275   "Version: GnuPG v1.4.6 (GNU/Linux)\n"
 276   "\n"
 277   "mNEER2PogwEGINdIR4u5PR4SwADWwj/ztgtoi7XVbmlfbQTHpBYFxTSC88pISSNy\n"
 278   "V/rgnlqunYP77F7aHL4KUReN3v9sKw01xSGEfox/JmlqUUg6CVvTjdeLfkuVIBnH\n"
 279   "j+2KMlaxezp7IxtPaTXpXcSf8iOuVq7UX7p6tKbppKXO5GgmfA88VUVvGBs1/PQp\n"
 280   "WKQdGrj+6I3RRmDN/hna1jGU/N23230Hbx+bu7g9cviiSh10ri7rdDhVJ67tRkRG\n"
 281   "Usy3XO6dWC7EmzZlEO8AEQEAAbQQdGVzdDMuZ251dGxzLm9yZ4kBAAQTAQIAJgUC\n"
 282   "R2PogwIbAwUJCWYBgAYLCQgHAwIEFQIIAwQWAgMBAh4BAheAAAoJEKAh4/gImZBR\n"
 283   "96QGH3E3zynETuQS3++hGMvMXq2mDJeT2e8964y/ifIOBpr2K2isuLYnrtGKyxi+\n"
 284   "ZptyHv6ymR3bDvio50cjnoT/WK1onosOJvtijGBS+U/ooq3im7ExpeQYXc/zpYsX\n"
 285   "OmB5m6BvdomUp2PMqdxsmOPoaRkSYx5R2Rlo/z3csodl6sp3k465Y/jg7L4gkxDz\n"
 286   "XJM+CS1xMhcOF0gBhppqLnG67x0ow847Pydstzkw0sOqedkLPuScaHNnlAWQ7QH6\n"
 287   "mbbpqHJwekS4jQRHiKV8AQQA0iZ81WXypLI4ZE2+hYfBCnfMVfQF/vPgvASxhwri\n"
 288   "GDa9Zc2f/VfakfNiwZgHH6iCeppHBiP2jljnbuOsL6f1R+0FsnyTVwHbuEU7IU2y\n"
 289   "+J0/s0z3wcx9sx8T7brP5z5F2hdagBsD9YFGCifHDAEew4mmAisY0i2QHVIuXJFj\n"
 290   "4RMAEQEAAYkBhwQYAQIADwUCR4ilfAIbAgUJEOrPgACoCRCgIeP4CJmQUZ0gBBkB\n"
 291   "AgAGBQJHiKV8AAoJEIN7b7QuD+F2AEcEAKAjhO9kSOE8UuwEOKlwsWL9LUUSkHJj\n"
 292   "c/ca0asLAerzrHsldRAcwCbWkVxBBHySw2CLFjzpgdXhwRtsytMgHaapfAPbinAW\n"
 293   "jCPIEJx2gDZeZnTgi4DVbZn5E3UzHGyL69MEoXr5t+vpiemQFd/nGD+h/Q2A76od\n"
 294   "gvAryRvS1Soj8bcGHjUflayXGOSvaD8P2V5Vz0hS82QZcqWxD8qUBqbcB8atokmO\n"
 295   "IYxhKyRmO58T5Ma+iaxBTUIwee+pBYDgdH6E2dh9xLlwwzZKaCcIRCQcObkLsMVo\n"
 296   "fZJo+m0Xf8zI57NeQF+hXJhW7lIrWgQVr8IVp/lgo76acLHfL/t1n0Nhg4r2srz2\n"
 297   "fpP2w5laQ0qImYLnZhGFHU+rJUyFaHfhD8/svN2LuZkO570pjV/K68EaHnEfk5b8\n"
 298   "jWu/euohwcCwf20M1kTo3Bg=\n"
 299   "=Xjon\n" "-----END PGP PUBLIC KEY BLOCK-----\n";
 300 const gnutls_datum_t server_crt = { server_crt_txt, sizeof (server_crt_txt) };
 301
 302 static unsigned char server_key_txt[] =
 303   "-----BEGIN PGP PRIVATE KEY BLOCK-----\n"
 304   "Version: GnuPG v1.4.6 (GNU/Linux)\n"
 305   "\n"
 306   "lQLGBEdj6IMBBiDXSEeLuT0eEsAA1sI/87YLaIu11W5pX20Ex6QWBcU0gvPKSEkj\n"
 307   "clf64J5arp2D++xe2hy+ClEXjd7/bCsNNcUhhH6MfyZpalFIOglb043Xi35LlSAZ\n"
 308   "x4/tijJWsXs6eyMbT2k16V3En/Ijrlau1F+6erSm6aSlzuRoJnwPPFVFbxgbNfz0\n"
 309   "KVikHRq4/uiN0UZgzf4Z2tYxlPzdt9t9B28fm7u4PXL4okoddK4u63Q4VSeu7UZE\n"
 310   "RlLMt1zunVguxJs2ZRDvABEBAAEABhwMx6crpb75ko5gXl9gsYSMj9O/YyCvU7Fi\n"
 311   "l8FnZ0dKMz3qs7jXyFlttLjh1DzYkXN6PAN5yp3+wnbK/e5eVeNSdo2WpJOwrVWO\n"
 312   "7pcQovHoKklAjmU98olaRhpv6BBTK+0tGUFaRrmrrYuz2xnwf3+kIpt4ahYW2dr9\n"
 313   "B+/pvBSVC/sv2+3PEQSsXlWCYVgkQ7WBN4GQdyjjxhQpcWdf8Z6unx4zuS3s7GGM\n"
 314   "4WaDxmDNCFlTGdrKPQeogtS3LVF9OiRCOvIlAxDmDvnC3zAwO/IvDUHFED9x9hmK\n"
 315   "MeVwCg8rwDMptVYN2hm+bjNzjV4pimUVd+w7edjEky0Jd/6tTH01CBUWxs9Pfup2\n"
 316   "cQ9zkYcVz1bwcoqeyRzFCJgi6PiVT38QFEvyusoVkwMQ747D6p7y+R52MEcIvcLb\n"
 317   "lBXhRviz3rW+Sch4+ohUPvBU41saM5B6UcOmhdPfdvPriI4qXwFxusGWt98NN3aW\n"
 318   "Ns2/L9kMX/SWnN6Elfj5hrrExDZ2CE60uuvfj+O/uXfO8LUDENE4vQrC399KLbJw\n"
 319   "uCaqjqLysYA9EY/Nv8RFGkk1UM4ViW8v1/95D95F9WqochSYH8Phr3br0chDxofb\n"
 320   "rnm6dUPE8uiriNaKWdoiUNSuvumh9lVixmRI923+4imu3scq+rlJAZ20EHRlc3Qz\n"
 321   "LmdudXRscy5vcmeJAQAEEwECACYFAkdj6IMCGwMFCQlmAYAGCwkIBwMCBBUCCAME\n"
 322   "FgIDAQIeAQIXgAAKCRCgIeP4CJmQUfekBh9xN88pxE7kEt/voRjLzF6tpgyXk9nv\n"
 323   "PeuMv4nyDgaa9itorLi2J67RissYvmabch7+spkd2w74qOdHI56E/1itaJ6LDib7\n"
 324   "YoxgUvlP6KKt4puxMaXkGF3P86WLFzpgeZugb3aJlKdjzKncbJjj6GkZEmMeUdkZ\n"
 325   "aP893LKHZerKd5OOuWP44Oy+IJMQ81yTPgktcTIXDhdIAYaaai5xuu8dKMPOOz8n\n"
 326   "bLc5MNLDqnnZCz7knGhzZ5QFkO0B+pm26ahycHpEnQHXBEeIpXwBBADSJnzVZfKk\n"
 327   "sjhkTb6Fh8EKd8xV9AX+8+C8BLGHCuIYNr1lzZ/9V9qR82LBmAcfqIJ6mkcGI/aO\n"
 328   "WOdu46wvp/VH7QWyfJNXAdu4RTshTbL4nT+zTPfBzH2zHxPtus/nPkXaF1qAGwP1\n"
 329   "gUYKJ8cMAR7DiaYCKxjSLZAdUi5ckWPhEwARAQABAAP3QKGVoNi52HXEN3ttUCyB\n"
 330   "Q1CDurh0MLDQoHomY3MGfI4VByk2YKMb2el4IJqyHrUbBYjTpHY31W2CSIdWfoTU\n"
 331   "DIik49CQaUpR13dJXEiG4d+nyETFutEalTQI4hMjABD9l1XvZP7Ll3YWmqN8Cam5\n"
 332   "JY23YAy2Noqbc3AcEut4+QIA1zcv8EU1QVqOwjSybRdm6HKK/A2bMqnITeUR/ikm\n"
 333   "IuU4lhijm/d1qS6ZBehRvvYa9MY4V7BGEQLWSlyc5aYJ/wIA+fmRv0lHSs78QSUg\n"
 334   "uRbNv6Aa6CXEOXmG+TpIaf/RWrPmBpdG8AROBVo1wmwG8oQaIjeX3RjKXfL3HTDD\n"
 335   "CxNg7QIA06tApdo2j1gr3IrroUwQ7yvi56ELB1Lv+W3WLN8lzCfQ6Fs+7IJRrC2R\n"
 336   "0uzLMGOsSORGAFIbAuLIMpc6rHCeS50hiQGHBBgBAgAPBQJHiKV8AhsCBQkQ6s+A\n"
 337   "AKgJEKAh4/gImZBRnSAEGQECAAYFAkeIpXwACgkQg3tvtC4P4XYARwQAoCOE72RI\n"
 338   "4TxS7AQ4qXCxYv0tRRKQcmNz9xrRqwsB6vOseyV1EBzAJtaRXEEEfJLDYIsWPOmB\n"
 339   "1eHBG2zK0yAdpql8A9uKcBaMI8gQnHaANl5mdOCLgNVtmfkTdTMcbIvr0wShevm3\n"
 340   "6+mJ6ZAV3+cYP6H9DYDvqh2C8CvJG9LVKiPxtwYeNR+VrJcY5K9oPw/ZXlXPSFLz\n"
 341   "ZBlypbEPypQGptwHxq2iSY4hjGErJGY7nxPkxr6JrEFNQjB576kFgOB0foTZ2H3E\n"
 342   "uXDDNkpoJwhEJBw5uQuwxWh9kmj6bRd/zMjns15AX6FcmFbuUitaBBWvwhWn+WCj\n"
 343   "vppwsd8v+3WfQ2GDivayvPZ+k/bDmVpDSoiZgudmEYUdT6slTIVod+EPz+y83Yu5\n"
 344   "mQ7nvSmNX8rrwRoecR+TlvyNa7966iHBwLB/bQzWROjcGA==\n"
 345   "=mZnW\n" "-----END PGP PRIVATE KEY BLOCK-----\n";
 346 const gnutls_datum_t server_key = { server_key_txt, sizeof (server_key_txt) };
 347
 348 static void
 349 server_start (void)
 350 {
 351   /* Socket operations
 352    */
 353   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 354   if (err == -1)
 355     {
 356       perror ("socket");
 357       fail ("server: socket failed\n");
 358       return;
 359     }
 360
 361   memset (&sa_serv, '\0', sizeof (sa_serv));
 362   sa_serv.sin_family = AF_INET;
 363   sa_serv.sin_addr.s_addr = INADDR_ANY;
 364   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 365
 366   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval,
 367               sizeof (int));
 368
 369   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 370   if (err == -1)
 371     {
 372       perror ("bind");
 373       fail ("server: bind failed\n");
 374       return;
 375     }
 376
 377   err = listen (listen_sd, 1024);
 378   if (err == -1)
 379     {
 380       perror ("listen");
 381       fail ("server: listen failed\n");
 382       return;
 383     }
 384
 385   if (debug)
 386     success ("server: ready. Listening to port '%d'.\n", PORT);
 387 }
 388
 389 static void
 390 server (void)
 391 {
 392   /* this must be called once in the program
 393    */
 394   gnutls_global_init ();
 395
 396   gnutls_global_set_log_function (tls_log_func);
 397   if (debug)
 398     gnutls_global_set_log_level (2);
 399
 400   gnutls_certificate_allocate_credentials (&pgp_cred);
 401
 402   ret = gnutls_certificate_set_openpgp_key_mem2 (pgp_cred, &server_crt,
 403                                                  &server_key, "auto",
 404                                                  GNUTLS_OPENPGP_FMT_BASE64);
 405   if (err < 0)
 406     {
 407       fail ("Could not set server key files...\n");
 408     }
 409
 410   if (debug)
 411     success ("Launched, setting DH parameters...\n");
 412
 413   generate_dh_params ();
 414
 415   gnutls_certificate_set_dh_params (pgp_cred, dh_params);
 416
 417   client_len = sizeof (sa_cli);
 418
 419   session = initialize_tls_session ();
 420
 421   sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 422
 423   if (debug)
 424     success ("server: connection from %s, port %d\n",
 425              inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 426                         sizeof (topbuf)), ntohs (sa_cli.sin_port));
 427
 428   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 429   ret = gnutls_handshake (session);
 430   if (ret < 0)
 431     {
 432       close (sd);
 433       gnutls_deinit (session);
 434       fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
 435       return;
 436     }
 437   if (debug)
 438     success ("server: Handshake was completed\n");
 439
 440   if (debug)
 441     success ("server: TLS version is: %s\n",
 442              gnutls_protocol_get_name (gnutls_protocol_get_version
 443                                        (session)));
 444
 445   /* see the Getting peer's information example */
 446   if (debug)
 447     print_info (session);
 448
 449   i = 0;
 450   for (;;)
 451     {
 452       memset (buffer, 0, MAX_BUF + 1);
 453       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 454
 455       if (ret == 0)
 456         {
 457           if (debug)
 458             success ("server: Peer has closed the GnuTLS connection\n");
 459           break;
 460         }
 461       else if (ret < 0)
 462         {
 463           fail ("server: Received corrupted data(%d). Closing...\n", ret);
 464           break;
 465         }
 466       else if (ret > 0)
 467         {
 468           /* echo data back to the client
 469            */
 470           gnutls_record_send (session, buffer, strlen (buffer));
 471         }
 472     }
 473   /* do not wait for the peer to close the connection.
 474    */
 475   gnutls_bye (session, GNUTLS_SHUT_WR);
 476
 477   close (sd);
 478   gnutls_deinit (session);
 479
 480   close (listen_sd);
 481
 482   gnutls_certificate_free_credentials (pgp_cred);
 483
 484   gnutls_dh_params_deinit (dh_params);
 485
 486   gnutls_global_deinit ();
 487
 488   if (debug)
 489     success ("server: finished\n");
 490 }
 491
 492
 493 void
 494 doit (void)
 495 {
 496   server_start ();
 497   if (error_count)
 498     return;
 499
 500   child = fork ();
 501   if (child < 0)
 502     {
 503       perror ("fork");
 504       fail ("fork");
 505       return;
 506     }
 507
 508   if (child)
 509     {
 510       int status;
 511       /* parent */
 512       server ();
 513       wait (&status);
 514     }
 515   else
 516     client ();
 517 }