lib/kadm5/ipropd_slave.c

   1 /*
   2  * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "iprop.h"
  35
  36 RCSID("$Id$");
  37
  38 static const char *config_name = "ipropd-slave";
  39
  40 static krb5_log_facility *log_facility;
  41 static char *server_time_lost = "5 min";
  42 static int time_before_lost;
  43 const char *slave_str = NULL;
  44
  45 static int
  46 connect_to_master (krb5_context context, const char *master,
  47                    const char *port_str)
  48 {
  49     char port[NI_MAXSERV];
  50     struct addrinfo *ai, *a;
  51     struct addrinfo hints;
  52     int error;
  53     int s = -1;
  54
  55     memset (&hints, 0, sizeof(hints));
  56     hints.ai_socktype = SOCK_STREAM;
  57
  58     if (port_str == NULL) {
  59         snprintf(port, sizeof(port), "%u", IPROP_PORT);
  60         port_str = port;
  61     }
  62
  63     error = getaddrinfo (master, port_str, &hints, &ai);
  64     if (error) {
  65         krb5_warnx(context, "Failed to get address of to %s: %s",
  66                    master, gai_strerror(error));
  67         return -1;
  68     }
  69
  70     for (a = ai; a != NULL; a = a->ai_next) {
  71         char node[NI_MAXHOST];
  72         error = getnameinfo(a->ai_addr, a->ai_addrlen,
  73                             node, sizeof(node), NULL, 0, NI_NUMERICHOST);
  74         if (error)
  75             strlcpy(node, "[unknown-addr]", sizeof(node));
  76
  77         s = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
  78         if (s < 0)
  79             continue;
  80         if (connect (s, a->ai_addr, a->ai_addrlen) < 0) {
  81             krb5_warn(context, errno, "connection failed to %s[%s]",
  82                       master, node);
  83             close (s);
  84             continue;
  85         }
  86         krb5_warnx(context, "connection successful "
  87                    "to master: %s[%s]", master, node);
  88         break;
  89     }
  90     freeaddrinfo (ai);
  91
  92     if (a == NULL)
  93         return -1;
  94
  95     return s;
  96 }
  97
  98 static void
  99 get_creds(krb5_context context, const char *keytab_str,
 100           krb5_ccache *cache, const char *serverhost)
 101 {
 102     krb5_keytab keytab;
 103     krb5_principal client;
 104     krb5_error_code ret;
 105     krb5_get_init_creds_opt *init_opts;
 106     krb5_creds creds;
 107     char *server;
 108     char keytab_buf[256];
 109
 110     if (keytab_str == NULL) {
 111         ret = krb5_kt_default_name (context, keytab_buf, sizeof(keytab_buf));
 112         if (ret)
 113             krb5_err (context, 1, ret, "krb5_kt_default_name");
 114         keytab_str = keytab_buf;
 115     }
 116
 117     ret = krb5_kt_resolve(context, keytab_str, &keytab);
 118     if(ret)
 119         krb5_err(context, 1, ret, "%s", keytab_str);
 120
 121
 122     ret = krb5_sname_to_principal (context, slave_str, IPROP_NAME,
 123                                    KRB5_NT_SRV_HST, &client);
 124     if (ret) krb5_err(context, 1, ret, "krb5_sname_to_principal");
 125
 126     ret = krb5_get_init_creds_opt_alloc(context, &init_opts);
 127     if (ret) krb5_err(context, 1, ret, "krb5_get_init_creds_opt_alloc");
 128
 129     asprintf (&server, "%s/%s", IPROP_NAME, serverhost);
 130     if (server == NULL)
 131         krb5_errx (context, 1, "malloc: no memory");
 132
 133     ret = krb5_get_init_creds_keytab(context, &creds, client, keytab,
 134                                      0, server, init_opts);
 135     free (server);
 136     krb5_get_init_creds_opt_free(context, init_opts);
 137     if(ret) krb5_err(context, 1, ret, "krb5_get_init_creds");
 138
 139     ret = krb5_kt_close(context, keytab);
 140     if(ret) krb5_err(context, 1, ret, "krb5_kt_close");
 141
 142     ret = krb5_cc_new_unique(context, krb5_cc_type_memory, NULL, cache);
 143     if(ret) krb5_err(context, 1, ret, "krb5_cc_new_unique");
 144
 145     ret = krb5_cc_initialize(context, *cache, client);
 146     if(ret) krb5_err(context, 1, ret, "krb5_cc_initialize");
 147
 148     ret = krb5_cc_store_cred(context, *cache, &creds);
 149     if(ret) krb5_err(context, 1, ret, "krb5_cc_store_cred");
 150
 151     krb5_free_cred_contents(context, &creds);
 152     krb5_free_principal(context, client);
 153 }
 154
 155 static krb5_error_code
 156 ihave (krb5_context context, krb5_auth_context auth_context,
 157        int fd, uint32_t version)
 158 {
 159     int ret;
 160     u_char buf[8];
 161     krb5_storage *sp;
 162     krb5_data data;
 163
 164     sp = krb5_storage_from_mem (buf, 8);
 165     krb5_store_int32 (sp, I_HAVE);
 166     krb5_store_int32 (sp, version);
 167     krb5_storage_free (sp);
 168     data.length = 8;
 169     data.data   = buf;
 170
 171     ret = krb5_write_priv_message(context, auth_context, &fd, &data);
 172     if (ret)
 173         krb5_warn (context, ret, "krb5_write_message");
 174     return ret;
 175 }
 176
 177 static void
 178 receive_loop (krb5_context context,
 179               krb5_storage *sp,
 180               kadm5_server_context *server_context)
 181 {
 182     int ret;
 183     off_t left, right;
 184     void *buf;
 185     int32_t vers, vers2;
 186     ssize_t sret;
 187
 188     /*
 189      * Seek to the current version of the local database.
 190      */
 191     do {
 192         int32_t len, timestamp, tmp;
 193         enum kadm_ops op;
 194
 195         if(krb5_ret_int32 (sp, &vers) != 0)
 196             return;
 197         krb5_ret_int32 (sp, &timestamp);
 198         krb5_ret_int32 (sp, &tmp);
 199         op = tmp;
 200         krb5_ret_int32 (sp, &len);
 201         if (vers <= server_context->log_context.version)
 202             krb5_storage_seek(sp, len + 8, SEEK_CUR);
 203     } while(vers <= server_context->log_context.version);
 204
 205     /*
 206      * Read up rest of the entires into the memory...
 207      */
 208     left  = krb5_storage_seek (sp, -16, SEEK_CUR);
 209     right = krb5_storage_seek (sp, 0, SEEK_END);
 210     buf = malloc (right - left);
 211     if (buf == NULL && (right - left) != 0)
 212         krb5_errx (context, 1, "malloc: no memory");
 213
 214     /*
 215      * ...and then write them out to the on-disk log.
 216      */
 217     krb5_storage_seek (sp, left, SEEK_SET);
 218     krb5_storage_read (sp, buf, right - left);
 219     sret = write (server_context->log_context.log_fd, buf, right-left);
 220     if (sret != right - left)
 221         krb5_err(context, 1, errno, "Failed to write log to disk");
 222     ret = fsync (server_context->log_context.log_fd);
 223     if (ret)
 224         krb5_err(context, 1, errno, "Failed to sync log to disk");
 225     free (buf);
 226
 227     /*
 228      * Go back to the startpoint and start to commit the entires to
 229      * the database.
 230      */
 231     krb5_storage_seek (sp, left, SEEK_SET);
 232
 233     for(;;) {
 234         int32_t len, len2, timestamp, tmp;
 235         off_t cur, cur2;
 236         enum kadm_ops op;
 237
 238         if(krb5_ret_int32 (sp, &vers) != 0)
 239             break;
 240         ret = krb5_ret_int32 (sp, &timestamp);
 241         if (ret) krb5_errx(context, 1, "entry %ld: too short", (long)vers);
 242         ret = krb5_ret_int32 (sp, &tmp);
 243         if (ret) krb5_errx(context, 1, "entry %ld: too short", (long)vers);
 244         op = tmp;
 245         ret = krb5_ret_int32 (sp, &len);
 246         if (ret) krb5_errx(context, 1, "entry %ld: too short", (long)vers);
 247         if (len < 0)
 248             krb5_errx(context, 1, "log is corrupted, "
 249                       "negative length of entry version %ld: %ld",
 250                       (long)vers, (long)len);
 251         cur = krb5_storage_seek(sp, 0, SEEK_CUR);
 252
 253         krb5_warnx (context, "replaying entry %d", (int)vers);
 254
 255         ret = kadm5_log_replay (server_context,
 256                                 op, vers, len, sp);
 257         if (ret) {
 258             const char *s = krb5_get_error_message(server_context->context, ret);
 259             krb5_warnx (context,
 260                         "kadm5_log_replay: %ld. Lost entry entry, "
 261                         "Database out of sync ?: %s (%d)",
 262                         (long)vers, s ? s : "unknown error", ret);
 263             krb5_free_error_message(context, s);
 264         }
 265
 266         {
 267             /*
 268              * Make sure the krb5_log_replay does the right thing wrt
 269              * reading out data from the sp.
 270              */
 271             cur2 = krb5_storage_seek(sp, 0, SEEK_CUR);
 272             if (cur + len != cur2)
 273                 krb5_errx(context, 1,
 274                           "kadm5_log_reply version: %ld didn't read the whole entry",
 275                           (long)vers);
 276         }
 277
 278         if (krb5_ret_int32 (sp, &len2) != 0)
 279             krb5_errx(context, 1, "entry %ld: postamble too short", (long)vers);
 280         if(krb5_ret_int32 (sp, &vers2) != 0)
 281             krb5_errx(context, 1, "entry %ld: postamble too short", (long)vers);
 282
 283         if (len != len2)
 284             krb5_errx(context, 1, "entry %ld: len != len2", (long)vers);
 285         if (vers != vers2)
 286             krb5_errx(context, 1, "entry %ld: vers != vers2", (long)vers);
 287     }
 288
 289     /*
 290      * Update version
 291      */
 292
 293     server_context->log_context.version = vers;
 294 }
 295
 296 static void
 297 receive (krb5_context context,
 298          krb5_storage *sp,
 299          kadm5_server_context *server_context)
 300 {
 301     int ret;
 302
 303     ret = server_context->db->hdb_open(context,
 304                                        server_context->db,
 305                                        O_RDWR | O_CREAT, 0600);
 306     if (ret)
 307         krb5_err (context, 1, ret, "db->open");
 308
 309     receive_loop (context, sp, server_context);
 310
 311     ret = server_context->db->hdb_close (context, server_context->db);
 312     if (ret)
 313         krb5_err (context, 1, ret, "db->close");
 314 }
 315
 316 static void
 317 send_im_here (krb5_context context, int fd,
 318               krb5_auth_context auth_context)
 319 {
 320     krb5_storage *sp;
 321     krb5_data data;
 322     int ret;
 323
 324     ret = krb5_data_alloc (&data, 4);
 325     if (ret)
 326         krb5_err (context, 1, ret, "send_im_here");
 327
 328     sp = krb5_storage_from_data (&data);
 329     if (sp == NULL)
 330         krb5_errx (context, 1, "krb5_storage_from_data");
 331     krb5_store_int32(sp, I_AM_HERE);
 332     krb5_storage_free(sp);
 333
 334     ret = krb5_write_priv_message(context, auth_context, &fd, &data);
 335     krb5_data_free(&data);
 336
 337     if (ret)
 338         krb5_err (context, 1, ret, "krb5_write_priv_message");
 339 }
 340
 341 static krb5_error_code
 342 receive_everything (krb5_context context, int fd,
 343                     kadm5_server_context *server_context,
 344                     krb5_auth_context auth_context)
 345 {
 346     int ret;
 347     krb5_data data;
 348     int32_t vno = 0;
 349     int32_t opcode;
 350     krb5_storage *sp;
 351
 352     char *dbname;
 353     HDB *mydb;
 354
 355     krb5_warnx(context, "receive complete database");
 356
 357     asprintf(&dbname, "%s-NEW", server_context->db->hdb_name);
 358     ret = hdb_create(context, &mydb, dbname);
 359     if(ret)
 360         krb5_err(context,1, ret, "hdb_create");
 361     free(dbname);
 362
 363     ret = hdb_set_master_keyfile (context,
 364                                   mydb, server_context->config.stash_file);
 365     if(ret)
 366         krb5_err(context,1, ret, "hdb_set_master_keyfile");
 367
 368     /* I really want to use O_EXCL here, but given that I can't easily clean
 369        up on error, I won't */
 370     ret = mydb->hdb_open(context, mydb, O_RDWR | O_CREAT | O_TRUNC, 0600);
 371     if (ret)
 372         krb5_err (context, 1, ret, "db->open");
 373
 374     sp = NULL;
 375     do {
 376         ret = krb5_read_priv_message(context, auth_context, &fd, &data);
 377
 378         if (ret) {
 379             krb5_warn (context, ret, "krb5_read_priv_message");
 380             goto cleanup;
 381         }
 382
 383         sp = krb5_storage_from_data (&data);
 384         if (sp == NULL)
 385             krb5_errx (context, 1, "krb5_storage_from_data");
 386         krb5_ret_int32 (sp, &opcode);
 387         if (opcode == ONE_PRINC) {
 388             krb5_data fake_data;
 389             hdb_entry_ex entry;
 390
 391             krb5_storage_free(sp);
 392
 393             fake_data.data   = (char *)data.data + 4;
 394             fake_data.length = data.length - 4;
 395
 396             memset(&entry, 0, sizeof(entry));
 397
 398             ret = hdb_value2entry (context, &fake_data, &entry.entry);
 399             if (ret)
 400                 krb5_err (context, 1, ret, "hdb_value2entry");
 401             ret = mydb->hdb_store(server_context->context,
 402                                   mydb,
 403                                   0, &entry);
 404             if (ret)
 405                 krb5_err (context, 1, ret, "hdb_store");
 406
 407             hdb_free_entry (context, &entry);
 408             krb5_data_free (&data);
 409         } else if (opcode == NOW_YOU_HAVE)
 410             ;
 411         else
 412             krb5_errx (context, 1, "strange opcode %d", opcode);
 413     } while (opcode == ONE_PRINC);
 414
 415     if (opcode != NOW_YOU_HAVE)
 416         krb5_errx (context, 1, "receive_everything: strange %d", opcode);
 417
 418     krb5_ret_int32 (sp, &vno);
 419     krb5_storage_free(sp);
 420
 421     ret = kadm5_log_reinit (server_context);
 422     if (ret)
 423         krb5_err(context, 1, ret, "kadm5_log_reinit");
 424
 425     ret = kadm5_log_set_version (server_context, vno - 1);
 426     if (ret)
 427         krb5_err (context, 1, ret, "kadm5_log_set_version");
 428
 429     ret = kadm5_log_nop (server_context);
 430     if (ret)
 431         krb5_err (context, 1, ret, "kadm5_log_nop");
 432
 433     ret = mydb->hdb_rename (context, mydb, server_context->db->hdb_name);
 434     if (ret)
 435         krb5_err (context, 1, ret, "db->rename");
 436
 437  cleanup:
 438     krb5_data_free (&data);
 439
 440     ret = mydb->hdb_close (context, mydb);
 441     if (ret)
 442         krb5_err (context, 1, ret, "db->close");
 443
 444     ret = mydb->hdb_destroy (context, mydb);
 445     if (ret)
 446         krb5_err (context, 1, ret, "db->destroy");
 447
 448     krb5_warnx(context, "receive complete database, version %ld", (long)vno);
 449     return ret;
 450 }
 451
 452 static char *config_file;
 453 static char *realm;
 454 static int version_flag;
 455 static int help_flag;
 456 static char *keytab_str;
 457 static char *port_str;
 458 #ifdef SUPPORT_DETACH
 459 static int detach_from_console = 0;
 460 #endif
 461
 462 static struct getargs args[] = {
 463     { "config-file", 'c', arg_string, &config_file },
 464     { "realm", 'r', arg_string, &realm },
 465     { "keytab", 'k', arg_string, &keytab_str,
 466       "keytab to get authentication from", "kspec" },
 467     { "time-lost", 0, arg_string, &server_time_lost,
 468       "time before server is considered lost", "time" },
 469     { "port", 0, arg_string, &port_str,
 470       "port ipropd-slave will connect to", "port"},
 471 #ifdef SUPPORT_DETACH
 472     { "detach", 0, arg_flag, &detach_from_console,
 473       "detach from console" },
 474 #endif
 475     { "hostname", 0, arg_string, &slave_str,
 476       "hostname of slave (if not same as hostname)", "hostname" },
 477     { "version", 0, arg_flag, &version_flag },
 478     { "help", 0, arg_flag, &help_flag }
 479 };
 480
 481 static int num_args = sizeof(args) / sizeof(args[0]);
 482
 483 static void
 484 usage(int status)
 485 {
 486     arg_printusage(args, num_args, NULL, "master");
 487     exit(status);
 488 }
 489
 490 int
 491 main(int argc, char **argv)
 492 {
 493     krb5_error_code ret;
 494     krb5_context context;
 495     krb5_auth_context auth_context;
 496     void *kadm_handle;
 497     kadm5_server_context *server_context;
 498     kadm5_config_params conf;
 499     int master_fd;
 500     krb5_ccache ccache;
 501     krb5_principal server;
 502     char **files;
 503     int optidx = 0;
 504     time_t reconnect_min;
 505     time_t backoff;
 506     time_t reconnect_max;
 507     time_t reconnect;
 508     time_t before = 0;
 509
 510     const char *master;
 511
 512     setprogname(argv[0]);
 513
 514     if(getarg(args, num_args, argc, argv, &optidx))
 515         usage(1);
 516
 517     if(help_flag)
 518         usage(0);
 519     if(version_flag) {
 520         print_version(NULL);
 521         exit(0);
 522     }
 523
 524     ret = krb5_init_context(&context);
 525     if (ret)
 526         errx (1, "krb5_init_context failed: %d", ret);
 527
 528     setup_signal();
 529
 530     if (config_file == NULL) {
 531         asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
 532         if (config_file == NULL)
 533             errx(1, "out of memory");
 534     }
 535
 536     ret = krb5_prepend_config_files_default(config_file, &files);
 537     if (ret)
 538         krb5_err(context, 1, ret, "getting configuration files");
 539
 540     ret = krb5_set_config_files(context, files);
 541     krb5_free_config_files(files);
 542     if (ret)
 543         krb5_err(context, 1, ret, "reading configuration files");
 544
 545     argc -= optidx;
 546     argv += optidx;
 547
 548     if (argc != 1)
 549         usage(1);
 550
 551     master = argv[0];
 552
 553 #ifdef SUPPORT_DETACH
 554     if (detach_from_console)
 555         daemon(0, 0);
 556 #endif
 557     pidfile (NULL);
 558     krb5_openlog (context, "ipropd-slave", &log_facility);
 559     krb5_set_warn_dest(context, log_facility);
 560
 561     ret = krb5_kt_register(context, &hdb_kt_ops);
 562     if(ret)
 563         krb5_err(context, 1, ret, "krb5_kt_register");
 564
 565     time_before_lost = parse_time (server_time_lost,  "s");
 566     if (time_before_lost < 0)
 567         krb5_errx (context, 1, "couldn't parse time: %s", server_time_lost);
 568
 569     memset(&conf, 0, sizeof(conf));
 570     if(realm) {
 571         conf.mask |= KADM5_CONFIG_REALM;
 572         conf.realm = realm;
 573     }
 574     ret = kadm5_init_with_password_ctx (context,
 575                                         KADM5_ADMIN_SERVICE,
 576                                         NULL,
 577                                         KADM5_ADMIN_SERVICE,
 578                                         &conf, 0, 0,
 579                                         &kadm_handle);
 580     if (ret)
 581         krb5_err (context, 1, ret, "kadm5_init_with_password_ctx");
 582
 583     server_context = (kadm5_server_context *)kadm_handle;
 584
 585     ret = kadm5_log_init (server_context);
 586     if (ret)
 587         krb5_err (context, 1, ret, "kadm5_log_init");
 588
 589     get_creds(context, keytab_str, &ccache, master);
 590
 591     ret = krb5_sname_to_principal (context, master, IPROP_NAME,
 592                                    KRB5_NT_SRV_HST, &server);
 593     if (ret)
 594         krb5_err (context, 1, ret, "krb5_sname_to_principal");
 595
 596     auth_context = NULL;
 597     master_fd = -1;
 598
 599     krb5_appdefault_time(context, config_name, NULL, "reconnect-min",
 600                          10, &reconnect_min);
 601     krb5_appdefault_time(context, config_name, NULL, "reconnect-max",
 602                          300, &reconnect_max);
 603     krb5_appdefault_time(context, config_name, NULL, "reconnect-backoff",
 604                          10, &backoff);
 605     reconnect = reconnect_min;
 606
 607     while (!exit_flag) {
 608         time_t now, elapsed;
 609         int connected = FALSE;
 610
 611         now = time(NULL);
 612         elapsed = now - before;
 613
 614         if (elapsed < reconnect) {
 615             time_t left = reconnect - elapsed;
 616             krb5_warnx(context, "sleeping %d seconds before "
 617                        "retrying to connect", (int)left);
 618             sleep(left);
 619         }
 620         before = now;
 621
 622         master_fd = connect_to_master (context, master, port_str);
 623         if (master_fd < 0)
 624             goto retry;
 625
 626         reconnect = reconnect_min;
 627
 628         if (auth_context) {
 629             krb5_auth_con_free(context, auth_context);
 630             auth_context = NULL;
 631             krb5_cc_destroy(context, ccache);
 632             get_creds(context, keytab_str, &ccache, master);
 633         }
 634         ret = krb5_sendauth (context, &auth_context, &master_fd,
 635                              IPROP_VERSION, NULL, server,
 636                              AP_OPTS_MUTUAL_REQUIRED, NULL, NULL,
 637                              ccache, NULL, NULL, NULL);
 638         if (ret) {
 639             krb5_warn (context, ret, "krb5_sendauth");
 640             goto retry;
 641         }
 642
 643         krb5_warnx(context, "ipropd-slave started at version: %ld",
 644                    (long)server_context->log_context.version);
 645
 646         ret = ihave (context, auth_context, master_fd,
 647                      server_context->log_context.version);
 648         if (ret)
 649             goto retry;
 650
 651         connected = TRUE;
 652
 653         while (connected && !exit_flag) {
 654             krb5_data out;
 655             krb5_storage *sp;
 656             int32_t tmp;
 657             fd_set readset;
 658             struct timeval to;
 659
 660             if (master_fd >= FD_SETSIZE)
 661                 krb5_errx (context, 1, "fd too large");
 662
 663             FD_ZERO(&readset);
 664             FD_SET(master_fd, &readset);
 665
 666             to.tv_sec = time_before_lost;
 667             to.tv_usec = 0;
 668
 669             ret = select (master_fd + 1,
 670                           &readset, NULL, NULL, &to);
 671             if (ret < 0) {
 672                 if (errno == EINTR)
 673                     continue;
 674                 else
 675                     krb5_err (context, 1, errno, "select");
 676             }
 677             if (ret == 0)
 678                 krb5_errx (context, 1, "server didn't send a message "
 679                            "in %d seconds", time_before_lost);
 680
 681             ret = krb5_read_priv_message(context, auth_context, &master_fd, &out);
 682             if (ret) {
 683                 krb5_warn (context, ret, "krb5_read_priv_message");
 684                 connected = FALSE;
 685                 continue;
 686             }
 687
 688             sp = krb5_storage_from_mem (out.data, out.length);
 689             krb5_ret_int32 (sp, &tmp);
 690             switch (tmp) {
 691             case FOR_YOU :
 692                 receive (context, sp, server_context);
 693                 ret = ihave (context, auth_context, master_fd,
 694                              server_context->log_context.version);
 695                 if (ret)
 696                     connected = FALSE;
 697                 break;
 698             case TELL_YOU_EVERYTHING :
 699                 ret = receive_everything (context, master_fd, server_context,
 700                                           auth_context);
 701                 if (ret)
 702                     connected = FALSE;
 703                 break;
 704             case ARE_YOU_THERE :
 705                 send_im_here (context, master_fd, auth_context);
 706                 break;
 707             case NOW_YOU_HAVE :
 708             case I_HAVE :
 709             case ONE_PRINC :
 710             case I_AM_HERE :
 711             default :
 712                 krb5_warnx (context, "Ignoring command %d", tmp);
 713                 break;
 714             }
 715             krb5_storage_free (sp);
 716             krb5_data_free (&out);
 717
 718         }
 719     retry:
 720         if (connected == FALSE)
 721             krb5_warnx (context, "disconnected for server");
 722         if (exit_flag)
 723             krb5_warnx (context, "got an exit signal");
 724
 725         if (master_fd >= 0)
 726             close(master_fd);
 727
 728         reconnect += backoff;
 729         if (reconnect > reconnect_max)
 730             reconnect = reconnect_max;
 731     }
 732
 733     if(exit_flag == SIGXCPU)
 734         krb5_warnx(context, "%s CPU time limit exceeded", getprogname());
 735     else if(exit_flag == SIGINT || exit_flag == SIGTERM)
 736         krb5_warnx(context, "%s terminated", getprogname());
 737     else
 738         krb5_warnx(context, "%s unexpected exit reason: %ld",
 739                        getprogname(), (long)exit_flag);
 740
 741     return 0;
 742 }