tests/x509dn.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
  41 #include "utils.h"
  42
  43 #include "ex-session-info.c"
  44 #include "ex-x509-info.c"
  45 #include "tcp.c"
  46
  47 pid_t child;
  48
  49 static void
  50 tls_log_func (int level, const char *str)
  51 {
  52   fprintf (stderr, "%s |<%d>| %s", child ? "server" : "client", level, str);
  53 }
  54
  55 /* A very basic TLS client, with anonymous authentication.
  56  */
  57
  58 #define MAX_BUF 1024
  59 #define MSG "Hello TLS"
  60
  61 static unsigned char ca_pem[] =
  62   "-----BEGIN CERTIFICATE-----\n"
  63   "MIIB5zCCAVKgAwIBAgIERiYdJzALBgkqhkiG9w0BAQUwGTEXMBUGA1UEAxMOR251\n"
  64   "VExTIHRlc3QgQ0EwHhcNMDcwNDE4MTMyOTExWhcNMDgwNDE3MTMyOTExWjAZMRcw\n"
  65   "FQYDVQQDEw5HbnVUTFMgdGVzdCBDQTCBnDALBgkqhkiG9w0BAQEDgYwAMIGIAoGA\n"
  66   "vuyYeh1vfmslnuggeEKgZAVmQ5ltSdUY7H25WGSygKMUYZ0KT74v8C780qtcNt9T\n"
  67   "7EPH/N6RvB4BprdssgcQLsthR3XKA84jbjjxNCcaGs33lvOz8A1nf8p3hD+cKfRi\n"
  68   "kfYSW2JazLrtCC4yRCas/SPOUxu78of+3HiTfFm/oXUCAwEAAaNDMEEwDwYDVR0T\n"
  69   "AQH/BAUwAwEB/zAPBgNVHQ8BAf8EBQMDBwQAMB0GA1UdDgQWBBTpPBz7rZJu5gak\n"
  70   "Viyi4cBTJ8jylTALBgkqhkiG9w0BAQUDgYEAiaIRqGfp1jPpNeVhABK60SU0KIAy\n"
  71   "njuu7kHq5peUgYn8Jd9zNzExBOEp1VOipGsf6G66oQAhDFp2o8zkz7ZH71zR4HEW\n"
  72   "KoX6n5Emn6DvcEH/9pAhnGxNHJAoS7czTKv/JDZJhkqHxyrE1fuLsg5Qv25DTw7+\n"
  73   "PfqUpIhz5Bbm7J4=\n" "-----END CERTIFICATE-----\n";
  74 const gnutls_datum_t ca = { ca_pem, sizeof (ca_pem) };
  75
  76 static unsigned char cert_pem[] =
  77   "-----BEGIN CERTIFICATE-----\n"
  78   "MIICHjCCAYmgAwIBAgIERiYdNzALBgkqhkiG9w0BAQUwGTEXMBUGA1UEAxMOR251\n"
  79   "VExTIHRlc3QgQ0EwHhcNMDcwNDE4MTMyOTI3WhcNMDgwNDE3MTMyOTI3WjAdMRsw\n"
  80   "GQYDVQQDExJHbnVUTFMgdGVzdCBjbGllbnQwgZwwCwYJKoZIhvcNAQEBA4GMADCB\n"
  81   "iAKBgLtmQ/Xyxde2jMzF3/WIO7HJS2oOoa0gUEAIgKFPXKPQ+GzP5jz37AR2ExeL\n"
  82   "ZIkiW8DdU3w77XwEu4C5KL6Om8aOoKUSy/VXHqLnu7czSZ/ju0quak1o/8kR4jKN\n"
  83   "zj2AC41179gAgY8oBAOgIo1hBAf6tjd9IQdJ0glhaZiQo1ipAgMBAAGjdjB0MAwG\n"
  84   "A1UdEwEB/wQCMAAwEwYDVR0lBAwwCgYIKwYBBQUHAwIwDwYDVR0PAQH/BAUDAweg\n"
  85   "ADAdBgNVHQ4EFgQUTLkKm/odNON+3svSBxX+odrLaJEwHwYDVR0jBBgwFoAU6Twc\n"
  86   "+62SbuYGpFYsouHAUyfI8pUwCwYJKoZIhvcNAQEFA4GBALujmBJVZnvaTXr9cFRJ\n"
  87   "jpfc/3X7sLUsMvumcDE01ls/cG5mIatmiyEU9qI3jbgUf82z23ON/acwJf875D3/\n"
  88   "U7jyOsBJ44SEQITbin2yUeJMIm1tievvdNXBDfW95AM507ShzP12sfiJkJfjjdhy\n"
  89   "dc8Siq5JojruiMizAf0pA7in\n" "-----END CERTIFICATE-----\n";
  90 const gnutls_datum_t cert = { cert_pem, sizeof (cert_pem) };
  91
  92 static unsigned char key_pem[] =
  93   "-----BEGIN RSA PRIVATE KEY-----\n"
  94   "MIICXAIBAAKBgQC7ZkP18sXXtozMxd/1iDuxyUtqDqGtIFBACIChT1yj0Phsz+Y8\n"
  95   "9+wEdhMXi2SJIlvA3VN8O+18BLuAuSi+jpvGjqClEsv1Vx6i57u3M0mf47tKrmpN\n"
  96   "aP/JEeIyjc49gAuNde/YAIGPKAQDoCKNYQQH+rY3fSEHSdIJYWmYkKNYqQIDAQAB\n"
  97   "AoGADpmARG5CQxS+AesNkGmpauepiCz1JBF/JwnyiX6vEzUh0Ypd39SZztwrDxvF\n"
  98   "PJjQaKVljml1zkJpIDVsqvHdyVdse8M+Qn6hw4x2p5rogdvhhIL1mdWo7jWeVJTF\n"
  99   "RKB7zLdMPs3ySdtcIQaF9nUAQ2KJEvldkO3m/bRJFEp54k0CQQDYy+RlTmwRD6hy\n"
 100   "7UtMjR0H3CSZJeQ8svMCxHLmOluG9H1UKk55ZBYfRTsXniqUkJBZ5wuV1L+pR9EK\n"
 101   "ca89a+1VAkEA3UmBelwEv2u9cAU1QjKjmwju1JgXbrjEohK+3B5y0ESEXPAwNQT9\n"
 102   "TrDM1m9AyxYTWLxX93dI5QwNFJtmbtjeBQJARSCWXhsoaDRG8QZrCSjBxfzTCqZD\n"
 103   "ZXtl807ymCipgJm60LiAt0JLr4LiucAsMZz6+j+quQbSakbFCACB8SLV1QJBAKZQ\n"
 104   "YKf+EPNtnmta/rRKKvySsi3GQZZN+Dt3q0r094XgeTsAqrqujVNfPhTMeP4qEVBX\n"
 105   "/iVX2cmMTSh3w3z8MaECQEp0XJWDVKOwcTW6Ajp9SowtmiZ3YDYo1LF9igb4iaLv\n"
 106   "sWZGfbnU3ryjvkb6YuFjgtzbZDZHWQCo8/cOtOBmPdk=\n"
 107   "-----END RSA PRIVATE KEY-----\n";
 108 const gnutls_datum_t key = { key_pem, sizeof (key_pem) };
 109
 110 #define EXPECT_RDN0 "GnuTLS test CA"
 111
 112 static int
 113 cert_callback (gnutls_session_t session,
 114                const gnutls_datum_t * req_ca_rdn, int nreqs,
 115                const gnutls_pk_algorithm_t * sign_algos,
 116                int sign_algos_length, gnutls_retr2_st * st)
 117 {
 118   int result;
 119   gnutls_x509_dn_t dn;
 120
 121   if (nreqs != 1)
 122     {
 123       fail ("client: invoked to provide client cert, %d CA .\n", nreqs);
 124       return -1;
 125     }
 126
 127   if (debug)
 128     success ("client: invoked to provide client cert.\n");
 129
 130   result = gnutls_x509_dn_init (&dn);
 131   if (result < 0)
 132     {
 133       fail ("client: could not initialize DN.\n");
 134       return -1;
 135     }
 136
 137   result = gnutls_x509_dn_import (dn, req_ca_rdn);
 138   if (result == 0)
 139     {
 140       gnutls_x509_ava_st val;
 141
 142       if (debug)
 143         success ("client: imported DN.\n");
 144
 145       if (gnutls_x509_dn_get_rdn_ava (dn, 0, 0, &val) == 0)
 146         {
 147           if (debug)
 148             success ("client: got RDN 0.\n");
 149
 150           if (val.value.size == strlen (EXPECT_RDN0)
 151               && strncmp (val.value.data, EXPECT_RDN0, val.value.size) == 0)
 152             {
 153               if (debug)
 154                 success ("client: RND 0 correct.\n");
 155             }
 156           else
 157             {
 158               fail ("client: RND 0 bad: %.*s\n",
 159                     val.value.size, val.value.data);
 160               return -1;
 161             }
 162         }
 163       else
 164         {
 165           fail ("client: could not retrieve RDN 0.\n");
 166           return -1;
 167         }
 168
 169       gnutls_x509_dn_deinit (dn);
 170     }
 171   else
 172     {
 173       fail ("client: failed to parse RDN: %s\n", gnutls_strerror (result));
 174     }
 175
 176   return 0;
 177 }
 178
 179
 180 static void
 181 client (void)
 182 {
 183   int ret, sd, ii;
 184   gnutls_session_t session;
 185   char buffer[MAX_BUF + 1];
 186   gnutls_certificate_credentials_t xcred;
 187
 188   gnutls_global_init ();
 189
 190   gnutls_global_set_log_function (tls_log_func);
 191   if (debug)
 192     gnutls_global_set_log_level (4711);
 193
 194   gnutls_certificate_allocate_credentials (&xcred);
 195
 196   /* sets the trusted cas file
 197    */
 198   gnutls_certificate_set_x509_trust_mem (xcred, &ca, GNUTLS_X509_FMT_PEM);
 199
 200   gnutls_certificate_set_retrieve_function (xcred, cert_callback);
 201
 202   /* Initialize TLS session
 203    */
 204   gnutls_init (&session, GNUTLS_CLIENT);
 205
 206   /* Use default priorities */
 207   gnutls_set_default_priority (session);
 208
 209   /* put the x509 credentials to the current session
 210    */
 211   gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, xcred);
 212
 213   /* connect to the peer
 214    */
 215   sd = tcp_connect ();
 216
 217   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 218
 219   /* Perform the TLS handshake
 220    */
 221   ret = gnutls_handshake (session);
 222
 223   if (ret < 0)
 224     {
 225       fail ("client: Handshake failed\n");
 226       gnutls_perror (ret);
 227       goto end;
 228     }
 229   else
 230     {
 231       if (debug)
 232         success ("client: Handshake was completed\n");
 233     }
 234
 235   if (debug)
 236     success ("client: TLS version is: %s\n",
 237              gnutls_protocol_get_name (gnutls_protocol_get_version
 238                                        (session)));
 239
 240   /* see the Getting peer's information example */
 241   if (debug)
 242     print_info (session);
 243
 244   gnutls_record_send (session, MSG, strlen (MSG));
 245
 246   ret = gnutls_record_recv (session, buffer, MAX_BUF);
 247   if (ret == 0)
 248     {
 249       if (debug)
 250         success ("client: Peer has closed the TLS connection\n");
 251       goto end;
 252     }
 253   else if (ret < 0)
 254     {
 255       fail ("client: Error: %s\n", gnutls_strerror (ret));
 256       goto end;
 257     }
 258
 259   if (debug)
 260     {
 261       printf ("- Received %d bytes: ", ret);
 262       for (ii = 0; ii < ret; ii++)
 263         {
 264           fputc (buffer[ii], stdout);
 265         }
 266       fputs ("\n", stdout);
 267     }
 268
 269   gnutls_bye (session, GNUTLS_SHUT_RDWR);
 270
 271 end:
 272
 273   tcp_close (sd);
 274
 275   gnutls_deinit (session);
 276
 277   gnutls_certificate_free_credentials (xcred);
 278
 279   gnutls_global_deinit ();
 280 }
 281
 282 /* This is a sample TLS 1.0 echo server, using X.509 authentication.
 283  */
 284
 285 #define SA struct sockaddr
 286 #define MAX_BUF 1024
 287 #define PORT 5556               /* listen to 5556 port */
 288 #define DH_BITS 1024
 289
 290 /* These are global */
 291 gnutls_certificate_credentials_t x509_cred;
 292
 293 static gnutls_session_t
 294 initialize_tls_session (void)
 295 {
 296   gnutls_session_t session;
 297
 298   gnutls_init (&session, GNUTLS_SERVER);
 299
 300   /* avoid calling all the priority functions, since the defaults
 301    * are adequate.
 302    */
 303   gnutls_set_default_priority (session);
 304
 305   gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE, x509_cred);
 306
 307   /* request client certificate if any.
 308    */
 309   gnutls_certificate_server_set_request (session, GNUTLS_CERT_REQUEST);
 310
 311   gnutls_dh_set_prime_bits (session, DH_BITS);
 312
 313   return session;
 314 }
 315
 316 static gnutls_dh_params_t dh_params;
 317
 318 static int
 319 generate_dh_params (void)
 320 {
 321   const gnutls_datum_t p3 = { (char *) pkcs3, strlen (pkcs3) };
 322   /* Generate Diffie-Hellman parameters - for use with DHE
 323    * kx algorithms. These should be discarded and regenerated
 324    * once a day, once a week or once a month. Depending on the
 325    * security requirements.
 326    */
 327   gnutls_dh_params_init (&dh_params);
 328   return gnutls_dh_params_import_pkcs3 (dh_params, &p3, GNUTLS_X509_FMT_PEM);
 329 }
 330
 331 int err, listen_sd, i;
 332 int sd, ret;
 333 struct sockaddr_in sa_serv;
 334 struct sockaddr_in sa_cli;
 335 int client_len;
 336 char topbuf[512];
 337 gnutls_session_t session;
 338 char buffer[MAX_BUF + 1];
 339 int optval = 1;
 340
 341
 342 static unsigned char server_cert_pem[] =
 343   "-----BEGIN CERTIFICATE-----\n"
 344   "MIICVjCCAcGgAwIBAgIERiYdMTALBgkqhkiG9w0BAQUwGTEXMBUGA1UEAxMOR251\n"
 345   "VExTIHRlc3QgQ0EwHhcNMDcwNDE4MTMyOTIxWhcNMDgwNDE3MTMyOTIxWjA3MRsw\n"
 346   "GQYDVQQKExJHbnVUTFMgdGVzdCBzZXJ2ZXIxGDAWBgNVBAMTD3Rlc3QuZ251dGxz\n"
 347   "Lm9yZzCBnDALBgkqhkiG9w0BAQEDgYwAMIGIAoGA17pcr6MM8C6pJ1aqU46o63+B\n"
 348   "dUxrmL5K6rce+EvDasTaDQC46kwTHzYWk95y78akXrJutsoKiFV1kJbtple8DDt2\n"
 349   "DZcevensf9Op7PuFZKBroEjOd35znDET/z3IrqVgbtm2jFqab7a+n2q9p/CgMyf1\n"
 350   "tx2S5Zacc1LWn9bIjrECAwEAAaOBkzCBkDAMBgNVHRMBAf8EAjAAMBoGA1UdEQQT\n"
 351   "MBGCD3Rlc3QuZ251dGxzLm9yZzATBgNVHSUEDDAKBggrBgEFBQcDATAPBgNVHQ8B\n"
 352   "Af8EBQMDB6AAMB0GA1UdDgQWBBTrx0Vu5fglyoyNgw106YbU3VW0dTAfBgNVHSME\n"
 353   "GDAWgBTpPBz7rZJu5gakViyi4cBTJ8jylTALBgkqhkiG9w0BAQUDgYEAaFEPTt+7\n"
 354   "bzvBuOf7+QmeQcn29kT6Bsyh1RHJXf8KTk5QRfwp6ogbp94JQWcNQ/S7YDFHglD1\n"
 355   "AwUNBRXwd3riUsMnsxgeSDxYBfJYbDLeohNBsqaPDJb7XailWbMQKfAbFQ8cnOxg\n"
 356   "rOKLUQRWJ0K3HyXRMhbqjdLIaQiCvQLuizo=\n" "-----END CERTIFICATE-----\n";
 357
 358 const gnutls_datum_t server_cert = { server_cert_pem,
 359   sizeof (server_cert_pem)
 360 };
 361
 362 static unsigned char server_key_pem[] =
 363   "-----BEGIN RSA PRIVATE KEY-----\n"
 364   "MIICXAIBAAKBgQDXulyvowzwLqknVqpTjqjrf4F1TGuYvkrqtx74S8NqxNoNALjq\n"
 365   "TBMfNhaT3nLvxqResm62ygqIVXWQlu2mV7wMO3YNlx696ex/06ns+4VkoGugSM53\n"
 366   "fnOcMRP/PciupWBu2baMWppvtr6far2n8KAzJ/W3HZLllpxzUtaf1siOsQIDAQAB\n"
 367   "AoGAYAFyKkAYC/PYF8e7+X+tsVCHXppp8AoP8TEZuUqOZz/AArVlle/ROrypg5kl\n"
 368   "8YunrvUdzH9R/KZ7saNZlAPLjZyFG9beL/am6Ai7q7Ma5HMqjGU8kTEGwD7K+lbG\n"
 369   "iomokKMOl+kkbY/2sI5Czmbm+/PqLXOjtVc5RAsdbgvtmvkCQQDdV5QuU8jap8Hs\n"
 370   "Eodv/tLJ2z4+SKCV2k/7FXSKWe0vlrq0cl2qZfoTUYRnKRBcWxc9o92DxK44wgPi\n"
 371   "oMQS+O7fAkEA+YG+K9e60sj1K4NYbMPAbYILbZxORDecvP8lcphvwkOVUqbmxOGh\n"
 372   "XRmTZUuhBrJhJKKf6u7gf3KWlPl6ShKEbwJASC118cF6nurTjuLf7YKARDjNTEws\n"
 373   "qZEeQbdWYINAmCMj0RH2P0mvybrsXSOD5UoDAyO7aWuqkHGcCLv6FGG+qwJAOVqq\n"
 374   "tXdUucl6GjOKKw5geIvRRrQMhb/m5scb+5iw8A4LEEHPgGiBaF5NtJZLALgWfo5n\n"
 375   "hmC8+G8F0F78znQtPwJBANexu+Tg5KfOnzSILJMo3oXiXhf5PqXIDmbN0BKyCKAQ\n"
 376   "LfkcEcUbVfmDaHpvzwY9VEaoMOKVLitETXdNSxVpvWM=\n"
 377   "-----END RSA PRIVATE KEY-----\n";
 378
 379 const gnutls_datum_t server_key = { server_key_pem,
 380   sizeof (server_key_pem)
 381 };
 382
 383 static void
 384 server_start (void)
 385 {
 386   /* Socket operations
 387    */
 388   listen_sd = socket (AF_INET, SOCK_STREAM, 0);
 389   if (err == -1)
 390     {
 391       perror ("socket");
 392       fail ("server: socket failed\n");
 393       return;
 394     }
 395
 396   memset (&sa_serv, '\0', sizeof (sa_serv));
 397   sa_serv.sin_family = AF_INET;
 398   sa_serv.sin_addr.s_addr = INADDR_ANY;
 399   sa_serv.sin_port = htons (PORT);      /* Server Port number */
 400
 401   setsockopt (listen_sd, SOL_SOCKET, SO_REUSEADDR, (void *) &optval,
 402               sizeof (int));
 403
 404   err = bind (listen_sd, (SA *) & sa_serv, sizeof (sa_serv));
 405   if (err == -1)
 406     {
 407       perror ("bind");
 408       fail ("server: bind failed\n");
 409       return;
 410     }
 411
 412   err = listen (listen_sd, 1024);
 413   if (err == -1)
 414     {
 415       perror ("listen");
 416       fail ("server: listen failed\n");
 417       return;
 418     }
 419
 420   if (debug)
 421     success ("server: ready. Listening to port '%d'.\n", PORT);
 422 }
 423
 424 static void
 425 server (void)
 426 {
 427   /* this must be called once in the program
 428    */
 429   gnutls_global_init ();
 430
 431   gnutls_global_set_log_function (tls_log_func);
 432   if (debug)
 433     gnutls_global_set_log_level (4711);
 434
 435   gnutls_certificate_allocate_credentials (&x509_cred);
 436   gnutls_certificate_set_x509_trust_mem (x509_cred, &ca, GNUTLS_X509_FMT_PEM);
 437
 438   gnutls_certificate_set_x509_key_mem (x509_cred, &server_cert, &server_key,
 439                                        GNUTLS_X509_FMT_PEM);
 440
 441   if (debug)
 442     success ("Launched, generating DH parameters...\n");
 443
 444   generate_dh_params ();
 445
 446   gnutls_certificate_set_dh_params (x509_cred, dh_params);
 447
 448   client_len = sizeof (sa_cli);
 449
 450   session = initialize_tls_session ();
 451
 452   sd = accept (listen_sd, (SA *) & sa_cli, &client_len);
 453
 454   if (debug)
 455     success ("server: connection from %s, port %d\n",
 456              inet_ntop (AF_INET, &sa_cli.sin_addr, topbuf,
 457                         sizeof (topbuf)), ntohs (sa_cli.sin_port));
 458
 459   gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd);
 460   ret = gnutls_handshake (session);
 461   if (ret < 0)
 462     {
 463       close (sd);
 464       gnutls_deinit (session);
 465       fail ("server: Handshake has failed (%s)\n\n", gnutls_strerror (ret));
 466       return;
 467     }
 468   if (debug)
 469     success ("server: Handshake was completed\n");
 470
 471   if (debug)
 472     success ("server: TLS version is: %s\n",
 473              gnutls_protocol_get_name (gnutls_protocol_get_version
 474                                        (session)));
 475
 476   /* see the Getting peer's information example */
 477   if (debug)
 478     print_info (session);
 479
 480   i = 0;
 481   for (;;)
 482     {
 483       memset (buffer, 0, MAX_BUF + 1);
 484       ret = gnutls_record_recv (session, buffer, MAX_BUF);
 485
 486       if (ret == 0)
 487         {
 488           if (debug)
 489             success ("server: Peer has closed the GnuTLS connection\n");
 490           break;
 491         }
 492       else if (ret < 0)
 493         {
 494           fail ("server: Received corrupted data(%d). Closing...\n", ret);
 495           break;
 496         }
 497       else if (ret > 0)
 498         {
 499           /* echo data back to the client
 500            */
 501           gnutls_record_send (session, buffer, strlen (buffer));
 502         }
 503     }
 504   /* do not wait for the peer to close the connection.
 505    */
 506   gnutls_bye (session, GNUTLS_SHUT_WR);
 507
 508   close (sd);
 509   gnutls_deinit (session);
 510
 511   close (listen_sd);
 512
 513   gnutls_certificate_free_credentials (x509_cred);
 514
 515   gnutls_dh_params_deinit (dh_params);
 516
 517   gnutls_global_deinit ();
 518
 519   if (debug)
 520     success ("server: finished\n");
 521 }
 522
 523
 524 void
 525 doit (void)
 526 {
 527   server_start ();
 528   if (error_count)
 529     return;
 530
 531   child = fork ();
 532   if (child < 0)
 533     {
 534       perror ("fork");
 535       fail ("fork");
 536       return;
 537     }
 538
 539   if (child)
 540     {
 541       int status;
 542       /* parent */
 543       server ();
 544       wait (&status);
 545
 546 #if defined WIFEXITED && defined WEXITSTATUS
 547       if (WIFEXITED (status) && WEXITSTATUS (status))
 548         {
 549           fail ("server: client failed with exit status %d\n",
 550                 WEXITSTATUS (status));
 551         }
 552 #endif
 553
 554 #if defined WIFSIGNALED && defined WTERMSIG
 555       if (WIFSIGNALED (status))
 556         {
 557           fail ("server: client failed with fatal signal %d\n",
 558                 WTERMSIG (status));
 559         }
 560 #endif
 561
 562     }
 563   else
 564     client ();
 565 }