lib/kadm5/ipropd_master.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 #include <rtbl.h>
  36
  37 static krb5_log_facility *log_facility;
  38
  39 const char *slave_stats_file;
  40 const char *slave_time_missing = "2 min";
  41 const char *slave_time_gone = "5 min";
  42
  43 static int time_before_missing;
  44 static int time_before_gone;
  45
  46 const char *master_hostname;
  47
  48 static krb5_socket_t
  49 make_signal_socket (krb5_context context)
  50 {
  51 #ifndef NO_UNIX_SOCKETS
  52     struct sockaddr_un addr;
  53     const char *fn;
  54     krb5_socket_t fd;
  55
  56     fn = kadm5_log_signal_socket(context);
  57
  58     fd = socket (AF_UNIX, SOCK_DGRAM, 0);
  59     if (fd < 0)
  60         krb5_err (context, 1, errno, "socket AF_UNIX");
  61     memset (&addr, 0, sizeof(addr));
  62     addr.sun_family = AF_UNIX;
  63     strlcpy (addr.sun_path, fn, sizeof(addr.sun_path));
  64     unlink (addr.sun_path);
  65     if (bind (fd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
  66         krb5_err (context, 1, errno, "bind %s", addr.sun_path);
  67     return fd;
  68 #else
  69     struct addrinfo *ai = NULL;
  70     krb5_socket_t fd;
  71
  72     kadm5_log_signal_socket_info(context, 1, &ai);
  73
  74     fd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
  75     if (rk_IS_BAD_SOCKET(fd))
  76         krb5_err (context, 1, rk_SOCK_ERRNO, "socket AF=%d", ai->ai_family);
  77
  78     if (rk_IS_SOCKET_ERROR( bind (fd, ai->ai_addr, ai->ai_addrlen) ))
  79         krb5_err (context, 1, rk_SOCK_ERRNO, "bind");
  80     return fd;
  81 #endif
  82 }
  83
  84 static krb5_socket_t
  85 make_listen_socket (krb5_context context, const char *port_str)
  86 {
  87     krb5_socket_t fd;
  88     int one = 1;
  89     struct sockaddr_in addr;
  90
  91     fd = socket (AF_INET, SOCK_STREAM, 0);
  92     if (rk_IS_BAD_SOCKET(fd))
  93         krb5_err (context, 1, rk_SOCK_ERRNO, "socket AF_INET");
  94     setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
  95     memset (&addr, 0, sizeof(addr));
  96     addr.sin_family = AF_INET;
  97
  98     if (port_str) {
  99         addr.sin_port = krb5_getportbyname (context,
 100                                               port_str, "tcp",
 101                                               0);
 102         if (addr.sin_port == 0) {
 103             char *ptr;
 104             long port;
 105
 106             port = strtol (port_str, &ptr, 10);
 107             if (port == 0 && ptr == port_str)
 108                 krb5_errx (context, 1, "bad port `%s'", port_str);
 109             addr.sin_port = htons(port);
 110         }
 111     } else {
 112         addr.sin_port = krb5_getportbyname (context, IPROP_SERVICE,
 113                                             "tcp", IPROP_PORT);
 114     }
 115     if(bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
 116         krb5_err (context, 1, errno, "bind");
 117     if (listen(fd, SOMAXCONN) < 0)
 118         krb5_err (context, 1, errno, "listen");
 119     return fd;
 120 }
 121
 122 struct slave {
 123     krb5_socket_t fd;
 124     struct sockaddr_in addr;
 125     char *name;
 126     krb5_auth_context ac;
 127     uint32_t version;
 128     time_t seen;
 129     unsigned long flags;
 130 #define SLAVE_F_DEAD    0x1
 131 #define SLAVE_F_AYT     0x2
 132     struct slave *next;
 133 };
 134
 135 typedef struct slave slave;
 136
 137 static int
 138 check_acl (krb5_context context, const char *name)
 139 {
 140     const char *fn;
 141     FILE *fp;
 142     char buf[256];
 143     int ret = 1;
 144     char *slavefile = NULL;
 145
 146     if (asprintf(&slavefile, "%s/slaves", hdb_db_dir(context)) == -1
 147         || slavefile == NULL)
 148         errx(1, "out of memory");
 149
 150     fn = krb5_config_get_string_default(context,
 151                                         NULL,
 152                                         slavefile,
 153                                         "kdc",
 154                                         "iprop-acl",
 155                                         NULL);
 156
 157     fp = fopen (fn, "r");
 158     free(slavefile);
 159     if (fp == NULL)
 160         return 1;
 161     while (fgets(buf, sizeof(buf), fp) != NULL) {
 162         buf[strcspn(buf, "\r\n")] = '\0';
 163         if (strcmp (buf, name) == 0) {
 164             ret = 0;
 165             break;
 166         }
 167     }
 168     fclose (fp);
 169     return ret;
 170 }
 171
 172 static void
 173 slave_seen(slave *s)
 174 {
 175     s->flags &= ~SLAVE_F_AYT;
 176     s->seen = time(NULL);
 177 }
 178
 179 static int
 180 slave_missing_p (slave *s)
 181 {
 182     if (time(NULL) > s->seen + time_before_missing)
 183         return 1;
 184     return 0;
 185 }
 186
 187 static int
 188 slave_gone_p (slave *s)
 189 {
 190     if (time(NULL) > s->seen + time_before_gone)
 191         return 1;
 192     return 0;
 193 }
 194
 195 static void
 196 slave_dead(krb5_context context, slave *s)
 197 {
 198     krb5_warnx(context, "slave %s dead", s->name);
 199
 200     if (!rk_IS_BAD_SOCKET(s->fd)) {
 201         rk_closesocket (s->fd);
 202         s->fd = rk_INVALID_SOCKET;
 203     }
 204     s->flags |= SLAVE_F_DEAD;
 205     slave_seen(s);
 206 }
 207
 208 static void
 209 remove_slave (krb5_context context, slave *s, slave **root)
 210 {
 211     slave **p;
 212
 213     if (!rk_IS_BAD_SOCKET(s->fd))
 214         rk_closesocket (s->fd);
 215     if (s->name)
 216         free (s->name);
 217     if (s->ac)
 218         krb5_auth_con_free (context, s->ac);
 219
 220     for (p = root; *p; p = &(*p)->next)
 221         if (*p == s) {
 222             *p = s->next;
 223             break;
 224         }
 225     free (s);
 226 }
 227
 228 static void
 229 add_slave (krb5_context context, krb5_keytab keytab, slave **root,
 230            krb5_socket_t fd)
 231 {
 232     krb5_principal server;
 233     krb5_error_code ret;
 234     slave *s;
 235     socklen_t addr_len;
 236     krb5_ticket *ticket = NULL;
 237     char hostname[128];
 238
 239     s = malloc(sizeof(*s));
 240     if (s == NULL) {
 241         krb5_warnx (context, "add_slave: no memory");
 242         return;
 243     }
 244     s->name = NULL;
 245     s->ac = NULL;
 246
 247     addr_len = sizeof(s->addr);
 248     s->fd = accept (fd, (struct sockaddr *)&s->addr, &addr_len);
 249     if (rk_IS_BAD_SOCKET(s->fd)) {
 250         krb5_warn (context, rk_SOCK_ERRNO, "accept");
 251         goto error;
 252     }
 253     if (master_hostname)
 254         strlcpy(hostname, master_hostname, sizeof(hostname));
 255     else
 256         gethostname(hostname, sizeof(hostname));
 257
 258     ret = krb5_sname_to_principal (context, hostname, IPROP_NAME,
 259                                    KRB5_NT_SRV_HST, &server);
 260     if (ret) {
 261         krb5_warn (context, ret, "krb5_sname_to_principal");
 262         goto error;
 263     }
 264
 265     ret = krb5_recvauth (context, &s->ac, &s->fd,
 266                          IPROP_VERSION, server, 0, keytab, &ticket);
 267     krb5_free_principal (context, server);
 268     if (ret) {
 269         krb5_warn (context, ret, "krb5_recvauth");
 270         goto error;
 271     }
 272     ret = krb5_unparse_name (context, ticket->client, &s->name);
 273     krb5_free_ticket (context, ticket);
 274     if (ret) {
 275         krb5_warn (context, ret, "krb5_unparse_name");
 276         goto error;
 277     }
 278     if (check_acl (context, s->name)) {
 279         krb5_warnx (context, "%s not in acl", s->name);
 280         goto error;
 281     }
 282
 283     {
 284         slave *l = *root;
 285
 286         while (l) {
 287             if (strcmp(l->name, s->name) == 0)
 288                 break;
 289             l = l->next;
 290         }
 291         if (l) {
 292             if (l->flags & SLAVE_F_DEAD) {
 293                 remove_slave(context, l, root);
 294             } else {
 295                 krb5_warnx (context, "second connection from %s", s->name);
 296                 goto error;
 297             }
 298         }
 299     }
 300
 301     krb5_warnx (context, "connection from %s", s->name);
 302
 303     s->version = 0;
 304     s->flags = 0;
 305     slave_seen(s);
 306     s->next = *root;
 307     *root = s;
 308     return;
 309 error:
 310     remove_slave(context, s, root);
 311 }
 312
 313 static int
 314 dump_one (krb5_context context, HDB *db, hdb_entry_ex *entry, void *v)
 315 {
 316     krb5_error_code ret;
 317     krb5_storage *dump = (krb5_storage *)v;
 318     krb5_storage *sp;
 319     krb5_data data;
 320
 321     ret = hdb_entry2value (context, &entry->entry, &data);
 322     if (ret)
 323         return ret;
 324     ret = krb5_data_realloc (&data, data.length + 4);
 325     if (ret)
 326         goto done;
 327     memmove ((char *)data.data + 4, data.data, data.length - 4);
 328     sp = krb5_storage_from_data(&data);
 329     if (sp == NULL) {
 330         ret = ENOMEM;
 331         goto done;
 332     }
 333     krb5_store_int32(sp, ONE_PRINC);
 334     krb5_storage_free(sp);
 335
 336     ret = krb5_store_data(dump, data);
 337
 338 done:
 339     krb5_data_free (&data);
 340     return ret;
 341 }
 342
 343 static int
 344 write_dump (krb5_context context, krb5_storage *dump,
 345             const char *database, uint32_t current_version)
 346 {
 347     krb5_error_code ret;
 348     krb5_storage *sp;
 349     HDB *db;
 350     krb5_data data;
 351     char buf[8];
 352
 353     /* we assume that the caller has obtained an exclusive lock */
 354
 355     ret = krb5_storage_truncate(dump, 0);
 356     if (ret)
 357         return ret;
 358
 359     /*
 360      * First we store zero as the HDB version, this will indicate to a
 361      * later reader that the dumpfile is invalid.  We later write the
 362      * correct version in the file after we have written all of the
 363      * messages.  A dump with a zero version will not be considered
 364      * to be valid.
 365      */
 366
 367     ret = krb5_store_uint32(dump, 0);
 368
 369     ret = hdb_create (context, &db, database);
 370     if (ret)
 371         krb5_err (context, 1, ret, "hdb_create: %s", database);
 372     ret = db->hdb_open (context, db, O_RDONLY, 0);
 373     if (ret)
 374         krb5_err (context, 1, ret, "db->open");
 375
 376     sp = krb5_storage_from_mem (buf, 4);
 377     if (sp == NULL)
 378         krb5_errx (context, 1, "krb5_storage_from_mem");
 379     krb5_store_int32 (sp, TELL_YOU_EVERYTHING);
 380     krb5_storage_free (sp);
 381
 382     data.data   = buf;
 383     data.length = 4;
 384
 385     ret = krb5_store_data(dump, data);
 386     if (ret) {
 387         krb5_warn (context, ret, "write_dump");
 388         return ret;
 389     }
 390
 391     ret = hdb_foreach (context, db, HDB_F_ADMIN_DATA, dump_one, dump);
 392     if (ret) {
 393         krb5_warn (context, ret, "write_dump: hdb_foreach");
 394         return ret;
 395     }
 396
 397     (*db->hdb_close)(context, db);
 398     (*db->hdb_destroy)(context, db);
 399
 400     sp = krb5_storage_from_mem (buf, 8);
 401     if (sp == NULL)
 402         krb5_errx (context, 1, "krb5_storage_from_mem");
 403     krb5_store_int32 (sp, NOW_YOU_HAVE);
 404     krb5_store_int32 (sp, current_version);
 405     krb5_storage_free (sp);
 406
 407     data.length = 8;
 408
 409     ret = krb5_store_data(dump, data);
 410     if (ret) {
 411         krb5_warn (context, ret, "write_dump");
 412         return ret;
 413     }
 414
 415     /*
 416      * We must ensure that the entire valid dump is written to disk
 417      * before we write the current version at the front thus making
 418      * it a valid dump file.  If we crash around here, this can be
 419      * important upon reboot.
 420      */
 421
 422     ret = krb5_storage_fsync(dump);
 423     if (ret == -1) {
 424         ret = errno;
 425         krb5_warn(context, ret, "syncing iprop dumpfile");
 426         return ret;
 427     }
 428
 429     ret = krb5_storage_seek(dump, 0, SEEK_SET);
 430     if (ret == -1) {
 431         ret = errno;
 432         krb5_warn(context, ret, "krb5_storage_seek(dump, 0, SEEK_SET)");
 433         return ret;
 434     }
 435
 436     /* Write current version at the front making the dump valid */
 437
 438     ret = krb5_store_uint32(dump, current_version);
 439     if (ret) {
 440         krb5_warn(context, ret, "writing version to dumpfile");
 441         return ret;
 442     }
 443
 444     /*
 445      * We don't need to fsync(2) after the real version is written as
 446      * it is not a disaster if it doesn't make it to disk if we crash.
 447      * After all, we'll just create a new dumpfile.
 448      */
 449
 450     krb5_warnx(context, "wrote new dumpfile (version %u)", current_version);
 451
 452     return 0;
 453 }
 454
 455 static int
 456 send_complete (krb5_context context, slave *s, const char *database,
 457                uint32_t current_version, uint32_t oldest_version)
 458 {
 459     krb5_error_code ret;
 460     krb5_storage *dump = NULL;
 461     uint32_t vno = 0;
 462     krb5_data data;
 463     int fd = -1;
 464     char *dfn;
 465
 466     ret = asprintf(&dfn, "%s/ipropd.dumpfile", hdb_db_dir(context));
 467     if (ret == -1 || !dfn) {
 468         krb5_warn(context, ENOMEM, "Cannot allocate memory");
 469         return ENOMEM;
 470     }
 471
 472     fd = open(dfn, O_CREAT|O_RDWR, 0600);
 473     if (fd == -1) {
 474         ret = errno;
 475         krb5_warn(context, ret, "Cannot open/create iprop dumpfile %s", dfn);
 476         free(dfn);
 477         return ret;
 478     }
 479     free(dfn);
 480
 481     dump = krb5_storage_from_fd(fd);
 482     if (!dump) {
 483         ret = errno;
 484         krb5_warn(context, ret, "krb5_storage_from_fd");
 485         goto done;
 486     }
 487
 488     for (;;) {
 489         ret = flock(fd, LOCK_SH);
 490         if (ret == -1) {
 491             ret = errno;
 492             krb5_warn(context, ret, "flock(fd, LOCK_SH)");
 493             goto done;
 494         }
 495
 496         krb5_storage_seek(dump, 0, SEEK_SET);
 497         if (ret == -1) {
 498             ret = errno;
 499             krb5_warn(context, ret, "krb5_storage_seek(dump, 0, SEEK_SET)");
 500             goto done;
 501         }
 502
 503         vno = 0;
 504         ret = krb5_ret_uint32(dump, &vno);
 505         if (ret && ret != HEIM_ERR_EOF) {
 506             krb5_warn(context, ret, "krb5_ret_uint32(dump, &vno)");
 507             goto done;
 508         }
 509
 510         /*
 511          * If the current dump has an appropriate version, then we can
 512          * break out of the loop and send the file below.
 513          */
 514
 515         if (vno >= oldest_version)
 516             break;
 517
 518         /*
 519          * Otherwise, we may need to write a new dump file.  We
 520          * obtain an exclusive lock on the fd.  Because this is
 521          * not guaranteed to be an upgrade of our existing shared
 522          * lock, someone else may have written a new dumpfile while
 523          * we were waiting and so we must first check the vno of
 524          * the dump to see if that happened.  If it did, we need
 525          * to go back to the top of the loop so that we can downgrade
 526          * our lock to a shared one.
 527          */
 528
 529         flock(fd, LOCK_EX);
 530         if (ret == -1) {
 531             ret = errno;
 532             krb5_warn(context, ret, "flock(fd, LOCK_EX)");
 533             goto done;
 534         }
 535
 536         krb5_storage_seek(dump, 0, SEEK_SET);
 537         if (ret == -1) {
 538             ret = errno;
 539             krb5_warn(context, ret, "krb5_storage_seek(dump, 0, SEEK_SET)");
 540             goto done;
 541         }
 542
 543         vno = 0;
 544         ret = krb5_ret_uint32(dump, &vno);
 545         if (ret && ret != HEIM_ERR_EOF) {
 546             krb5_warn(context, ret, "krb5_ret_uint32(dump, &vno)");
 547             goto done;
 548         }
 549
 550         /* check if someone wrote a better version for us */
 551         if (vno >= oldest_version)
 552             continue;
 553
 554         /* Now, we know that we must write a new dump file.  */
 555
 556         ret = write_dump(context, dump, database, current_version);
 557         if (ret)
 558             goto done;
 559
 560         /*
 561          * And we must continue to the top of the loop so that we can
 562          * downgrade to a shared lock.
 563          */
 564     }
 565
 566     /*
 567      * Leaving the above loop, dump should have a ptr right after the initial
 568      * 4 byte DB version number and we should have a shared lock on the file
 569      * (which we may have just created), so we are reading to simply blast
 570      * the data down the wire.
 571      */
 572
 573     for (;;) {
 574         ret = krb5_ret_data(dump, &data);
 575         if (ret == HEIM_ERR_EOF) {
 576             ret = 0;    /* EOF is not an error, it's success */
 577             goto done;
 578         }
 579
 580         if (ret) {
 581             krb5_warn(context, ret, "krb5_ret_data(dump, &data)");
 582             slave_dead(context, s);
 583             goto done;
 584         }
 585
 586         ret = krb5_write_priv_message(context, s->ac, &s->fd, &data);
 587         krb5_data_free(&data);
 588
 589         if (ret) {
 590             krb5_warn (context, ret, "krb5_write_priv_message");
 591             slave_dead(context, s);
 592             goto done;
 593         }
 594     }
 595
 596 done:
 597     if (!ret) {
 598         s->version = vno;
 599         slave_seen(s);
 600     }
 601     if (fd != -1)
 602         close(fd);
 603     if (dump)
 604         krb5_storage_free(dump);
 605     return ret;
 606 }
 607
 608 static int
 609 send_are_you_there (krb5_context context, slave *s)
 610 {
 611     krb5_storage *sp;
 612     krb5_data data;
 613     char buf[4];
 614     int ret;
 615
 616     if (s->flags & (SLAVE_F_DEAD|SLAVE_F_AYT))
 617         return 0;
 618
 619     krb5_warnx(context, "slave %s missing, sending AYT", s->name);
 620
 621     s->flags |= SLAVE_F_AYT;
 622
 623     data.data = buf;
 624     data.length = 4;
 625
 626     sp = krb5_storage_from_mem (buf, 4);
 627     if (sp == NULL) {
 628         krb5_warnx (context, "are_you_there: krb5_data_alloc");
 629         slave_dead(context, s);
 630         return 1;
 631     }
 632     krb5_store_int32 (sp, ARE_YOU_THERE);
 633     krb5_storage_free (sp);
 634
 635     ret = krb5_write_priv_message(context, s->ac, &s->fd, &data);
 636
 637     if (ret) {
 638         krb5_warn (context, ret, "are_you_there: krb5_write_priv_message");
 639         slave_dead(context, s);
 640         return 1;
 641     }
 642
 643     return 0;
 644 }
 645
 646 static int
 647 send_diffs (krb5_context context, slave *s, int log_fd,
 648             const char *database, uint32_t current_version)
 649 {
 650     krb5_storage *sp;
 651     uint32_t ver;
 652     time_t timestamp;
 653     enum kadm_ops op;
 654     uint32_t len;
 655     off_t right, left;
 656     krb5_data data;
 657     int ret = 0;
 658
 659     if (s->version == current_version) {
 660         char buf[4];
 661
 662         sp = krb5_storage_from_mem(buf, 4);
 663         if (sp == NULL)
 664             krb5_errx(context, 1, "krb5_storage_from_mem");
 665         krb5_store_int32(sp, YOU_HAVE_LAST_VERSION);
 666         krb5_storage_free(sp);
 667         data.data   = buf;
 668         data.length = 4;
 669         ret = krb5_write_priv_message(context, s->ac, &s->fd, &data);
 670         krb5_warnx(context, "slave %s in sync already at version %ld",
 671                    s->name, (long)s->version);
 672         return ret;
 673     }
 674
 675     if (s->flags & SLAVE_F_DEAD)
 676         return 0;
 677
 678     flock(log_fd, LOCK_SH);
 679     sp = kadm5_log_goto_end (log_fd);
 680     flock(log_fd, LOCK_UN);
 681     right = krb5_storage_seek(sp, 0, SEEK_CUR);
 682     for (;;) {
 683         ret = kadm5_log_previous (context, sp, &ver, &timestamp, &op, &len);
 684         if (ret)
 685             krb5_err(context, 1, ret,
 686                      "send_diffs: failed to find previous entry");
 687         left = krb5_storage_seek(sp, -16, SEEK_CUR);
 688         if (ver == s->version)
 689             return 0;
 690         if (ver == s->version + 1)
 691             break;
 692         if (left == 0) {
 693             krb5_storage_free(sp);
 694             krb5_warnx(context,
 695                        "slave %s (version %lu) out of sync with master "
 696                        "(first version in log %lu), sending complete database",
 697                        s->name, (unsigned long)s->version, (unsigned long)ver);
 698             return send_complete (context, s, database, current_version, ver);
 699         }
 700     }
 701
 702     krb5_warnx(context,
 703                "syncing slave %s from version %lu to version %lu",
 704                s->name, (unsigned long)s->version,
 705                (unsigned long)current_version);
 706
 707     ret = krb5_data_alloc (&data, right - left + 4);
 708     if (ret) {
 709         krb5_storage_free(sp);
 710         krb5_warn (context, ret, "send_diffs: krb5_data_alloc");
 711         slave_dead(context, s);
 712         return 1;
 713     }
 714     krb5_storage_read (sp, (char *)data.data + 4, data.length - 4);
 715     krb5_storage_free(sp);
 716
 717     sp = krb5_storage_from_data (&data);
 718     if (sp == NULL) {
 719         krb5_warnx (context, "send_diffs: krb5_storage_from_data");
 720         slave_dead(context, s);
 721         return 1;
 722     }
 723     krb5_store_int32 (sp, FOR_YOU);
 724     krb5_storage_free(sp);
 725
 726     ret = krb5_write_priv_message(context, s->ac, &s->fd, &data);
 727     krb5_data_free(&data);
 728
 729     if (ret) {
 730         krb5_warn (context, ret, "send_diffs: krb5_write_priv_message");
 731         slave_dead(context, s);
 732         return 1;
 733     }
 734     slave_seen(s);
 735
 736     s->version = current_version;
 737
 738     return 0;
 739 }
 740
 741 static int
 742 process_msg (krb5_context context, slave *s, int log_fd,
 743              const char *database, uint32_t current_version)
 744 {
 745     int ret = 0;
 746     krb5_data out;
 747     krb5_storage *sp;
 748     int32_t tmp;
 749
 750     ret = krb5_read_priv_message(context, s->ac, &s->fd, &out);
 751     if(ret) {
 752         krb5_warn (context, ret, "error reading message from %s", s->name);
 753         return 1;
 754     }
 755
 756     sp = krb5_storage_from_mem (out.data, out.length);
 757     if (sp == NULL) {
 758         krb5_warnx (context, "process_msg: no memory");
 759         krb5_data_free (&out);
 760         return 1;
 761     }
 762     if (krb5_ret_int32 (sp, &tmp) != 0) {
 763         krb5_warnx (context, "process_msg: client send too short command");
 764         krb5_data_free (&out);
 765         return 1;
 766     }
 767     switch (tmp) {
 768     case I_HAVE :
 769         ret = krb5_ret_int32 (sp, &tmp);
 770         if (ret != 0) {
 771             krb5_warnx (context, "process_msg: client send too I_HAVE data");
 772             break;
 773         }
 774         /* new started slave that have old log */
 775         if (s->version == 0 && tmp != 0) {
 776             if (current_version < (uint32_t)tmp) {
 777                 krb5_warnx (context, "Slave %s (version %lu) have later version "
 778                             "the master (version %lu) OUT OF SYNC",
 779                             s->name, (unsigned long)tmp,
 780                             (unsigned long)current_version);
 781             }
 782             s->version = tmp;
 783         }
 784         if ((uint32_t)tmp < s->version) {
 785             krb5_warnx (context, "Slave claims to not have "
 786                         "version we already sent to it");
 787         } else {
 788             ret = send_diffs (context, s, log_fd, database, current_version);
 789         }
 790         break;
 791     case I_AM_HERE :
 792         break;
 793     case ARE_YOU_THERE:
 794     case FOR_YOU :
 795     default :
 796         krb5_warnx (context, "Ignoring command %d", tmp);
 797         break;
 798     }
 799
 800     krb5_data_free (&out);
 801     krb5_storage_free (sp);
 802
 803     slave_seen(s);
 804
 805     return ret;
 806 }
 807
 808 #define SLAVE_NAME      "Name"
 809 #define SLAVE_ADDRESS   "Address"
 810 #define SLAVE_VERSION   "Version"
 811 #define SLAVE_STATUS    "Status"
 812 #define SLAVE_SEEN      "Last Seen"
 813
 814 static FILE *
 815 open_stats(krb5_context context)
 816 {
 817     char *statfile = NULL;
 818     const char *fn = NULL;
 819     FILE *out = NULL;
 820
 821     /*
 822      * krb5_config_get_string_default() returs default value as-is,
 823      * delay free() of "statfile" until we're done with "fn".
 824      */
 825     if (slave_stats_file)
 826         fn = slave_stats_file;
 827     else if (asprintf(&statfile,  "%s/slaves-stats", hdb_db_dir(context)) != -1
 828              && statfile != NULL)
 829         fn = krb5_config_get_string_default(context,
 830                                             NULL,
 831                                             statfile,
 832                                             "kdc",
 833                                             "iprop-stats",
 834                                             NULL);
 835     if (fn != NULL)
 836         out = fopen(fn, "w");
 837     if (statfile != NULL)
 838         free(statfile);
 839     return out;
 840 }
 841
 842 static void
 843 write_master_down(krb5_context context)
 844 {
 845     char str[100];
 846     time_t t = time(NULL);
 847     FILE *fp;
 848
 849     fp = open_stats(context);
 850     if (fp == NULL)
 851         return;
 852     krb5_format_time(context, t, str, sizeof(str), TRUE);
 853     fprintf(fp, "master down at %s\n", str);
 854
 855     fclose(fp);
 856 }
 857
 858 static void
 859 write_stats(krb5_context context, slave *slaves, uint32_t current_version)
 860 {
 861     char str[100];
 862     rtbl_t tbl;
 863     time_t t = time(NULL);
 864     FILE *fp;
 865
 866     fp = open_stats(context);
 867     if (fp == NULL)
 868         return;
 869
 870     krb5_format_time(context, t, str, sizeof(str), TRUE);
 871     fprintf(fp, "Status for slaves, last updated: %s\n\n", str);
 872
 873     fprintf(fp, "Master version: %lu\n\n", (unsigned long)current_version);
 874
 875     tbl = rtbl_create();
 876     if (tbl == NULL) {
 877         fclose(fp);
 878         return;
 879     }
 880
 881     rtbl_add_column(tbl, SLAVE_NAME, 0);
 882     rtbl_add_column(tbl, SLAVE_ADDRESS, 0);
 883     rtbl_add_column(tbl, SLAVE_VERSION, RTBL_ALIGN_RIGHT);
 884     rtbl_add_column(tbl, SLAVE_STATUS, 0);
 885     rtbl_add_column(tbl, SLAVE_SEEN, 0);
 886
 887     rtbl_set_prefix(tbl, "  ");
 888     rtbl_set_column_prefix(tbl, SLAVE_NAME, "");
 889
 890     while (slaves) {
 891         krb5_address addr;
 892         krb5_error_code ret;
 893         rtbl_add_column_entry(tbl, SLAVE_NAME, slaves->name);
 894         ret = krb5_sockaddr2address (context,
 895                                      (struct sockaddr*)&slaves->addr, &addr);
 896         if(ret == 0) {
 897             krb5_print_address(&addr, str, sizeof(str), NULL);
 898             krb5_free_address(context, &addr);
 899             rtbl_add_column_entry(tbl, SLAVE_ADDRESS, str);
 900         } else
 901             rtbl_add_column_entry(tbl, SLAVE_ADDRESS, "<unknown>");
 902
 903         snprintf(str, sizeof(str), "%u", (unsigned)slaves->version);
 904         rtbl_add_column_entry(tbl, SLAVE_VERSION, str);
 905
 906         if (slaves->flags & SLAVE_F_DEAD)
 907             rtbl_add_column_entry(tbl, SLAVE_STATUS, "Down");
 908         else
 909             rtbl_add_column_entry(tbl, SLAVE_STATUS, "Up");
 910
 911         ret = krb5_format_time(context, slaves->seen, str, sizeof(str), TRUE);
 912         rtbl_add_column_entry(tbl, SLAVE_SEEN, str);
 913
 914         slaves = slaves->next;
 915     }
 916
 917     rtbl_format(tbl, fp);
 918     rtbl_destroy(tbl);
 919
 920     fclose(fp);
 921 }
 922
 923
 924 static char sHDB[] = "HDBGET:";
 925 static char *realm;
 926 static int version_flag;
 927 static int help_flag;
 928 static char *keytab_str = sHDB;
 929 static char *database;
 930 static char *config_file;
 931 static char *port_str;
 932 #ifdef SUPPORT_DETACH
 933 static int detach_from_console = 0;
 934 #endif
 935
 936 static struct getargs args[] = {
 937     { "config-file", 'c', arg_string, &config_file, NULL, NULL },
 938     { "realm", 'r', arg_string, &realm, NULL, NULL },
 939     { "keytab", 'k', arg_string, &keytab_str,
 940       "keytab to get authentication from", "kspec" },
 941     { "database", 'd', arg_string, &database, "database", "file"},
 942     { "slave-stats-file", 0, arg_string, rk_UNCONST(&slave_stats_file),
 943       "file for slave status information", "file"},
 944     { "time-missing", 0, arg_string, rk_UNCONST(&slave_time_missing),
 945       "time before slave is polled for presence", "time"},
 946     { "time-gone", 0, arg_string, rk_UNCONST(&slave_time_gone),
 947       "time of inactivity after which a slave is considered gone", "time"},
 948     { "port", 0, arg_string, &port_str,
 949       "port ipropd will listen to", "port"},
 950 #ifdef SUPPORT_DETACH
 951     { "detach", 0, arg_flag, &detach_from_console,
 952       "detach from console", NULL },
 953 #endif
 954     { "hostname", 0, arg_string, rk_UNCONST(&master_hostname),
 955       "hostname of master (if not same as hostname)", "hostname" },
 956     { "version", 0, arg_flag, &version_flag, NULL, NULL },
 957     { "help", 0, arg_flag, &help_flag, NULL, NULL }
 958 };
 959 static int num_args = sizeof(args) / sizeof(args[0]);
 960
 961 int
 962 main(int argc, char **argv)
 963 {
 964     krb5_error_code ret;
 965     krb5_context context;
 966     void *kadm_handle;
 967     kadm5_server_context *server_context;
 968     kadm5_config_params conf;
 969     krb5_socket_t signal_fd, listen_fd;
 970     int log_fd;
 971     slave *slaves = NULL;
 972     uint32_t current_version = 0, old_version = 0;
 973     krb5_keytab keytab;
 974     char **files;
 975     int aret;
 976
 977     (void) krb5_program_setup(&context, argc, argv, args, num_args, NULL);
 978
 979     if(help_flag)
 980         krb5_std_usage(0, args, num_args);
 981     if(version_flag) {
 982         print_version(NULL);
 983         exit(0);
 984     }
 985
 986     setup_signal();
 987
 988     if (config_file == NULL) {
 989         aret = asprintf(&config_file, "%s/kdc.conf", hdb_db_dir(context));
 990         if (aret == -1 || config_file == NULL)
 991             errx(1, "out of memory");
 992     }
 993
 994     ret = krb5_prepend_config_files_default(config_file, &files);
 995     if (ret)
 996         krb5_err(context, 1, ret, "getting configuration files");
 997
 998     ret = krb5_set_config_files(context, files);
 999     krb5_free_config_files(files);
1000     if (ret)
1001         krb5_err(context, 1, ret, "reading configuration files");
1002
1003     time_before_gone = parse_time (slave_time_gone,  "s");
1004     if (time_before_gone < 0)
1005         krb5_errx (context, 1, "couldn't parse time: %s", slave_time_gone);
1006     time_before_missing = parse_time (slave_time_missing,  "s");
1007     if (time_before_missing < 0)
1008         krb5_errx (context, 1, "couldn't parse time: %s", slave_time_missing);
1009
1010 #ifdef SUPPORT_DETACH
1011     if (detach_from_console) {
1012         aret = daemon(0, 0);
1013         if (aret == -1) {
1014             /* not much to do if detaching fails... */
1015             krb5_err(context, 1, aret, "failed to daemon(3)ise");
1016         }
1017     }
1018 #endif
1019     pidfile (NULL);
1020     krb5_openlog (context, "ipropd-master", &log_facility);
1021     krb5_set_warn_dest(context, log_facility);
1022
1023     ret = krb5_kt_register(context, &hdb_get_kt_ops);
1024     if(ret)
1025         krb5_err(context, 1, ret, "krb5_kt_register");
1026
1027     ret = krb5_kt_resolve(context, keytab_str, &keytab);
1028     if(ret)
1029         krb5_err(context, 1, ret, "krb5_kt_resolve: %s", keytab_str);
1030
1031     memset(&conf, 0, sizeof(conf));
1032     if(realm) {
1033         conf.mask |= KADM5_CONFIG_REALM;
1034         conf.realm = realm;
1035     }
1036     ret = kadm5_init_with_skey_ctx (context,
1037                                     KADM5_ADMIN_SERVICE,
1038                                     NULL,
1039                                     KADM5_ADMIN_SERVICE,
1040                                     &conf, 0, 0,
1041                                     &kadm_handle);
1042     if (ret)
1043         krb5_err (context, 1, ret, "kadm5_init_with_password_ctx");
1044
1045     server_context = (kadm5_server_context *)kadm_handle;
1046
1047     log_fd = open (server_context->log_context.log_file, O_RDONLY, 0);
1048     if (log_fd < 0)
1049         krb5_err (context, 1, errno, "open %s",
1050                   server_context->log_context.log_file);
1051
1052     signal_fd = make_signal_socket (context);
1053     listen_fd = make_listen_socket (context, port_str);
1054
1055     flock(log_fd, LOCK_SH);
1056     kadm5_log_get_version_fd (log_fd, &current_version);
1057     flock(log_fd, LOCK_UN);
1058
1059     krb5_warnx(context, "ipropd-master started at version: %lu",
1060                (unsigned long)current_version);
1061
1062     while(exit_flag == 0){
1063         slave *p;
1064         fd_set readset;
1065         int max_fd = 0;
1066         struct timeval to = {30, 0};
1067         uint32_t vers;
1068
1069 #ifndef NO_LIMIT_FD_SETSIZE
1070         if (signal_fd >= FD_SETSIZE || listen_fd >= FD_SETSIZE)
1071             krb5_errx (context, 1, "fd too large");
1072 #endif
1073
1074         FD_ZERO(&readset);
1075         FD_SET(signal_fd, &readset);
1076         max_fd = max(max_fd, signal_fd);
1077         FD_SET(listen_fd, &readset);
1078         max_fd = max(max_fd, listen_fd);
1079
1080         for (p = slaves; p != NULL; p = p->next) {
1081             if (p->flags & SLAVE_F_DEAD)
1082                 continue;
1083             FD_SET(p->fd, &readset);
1084             max_fd = max(max_fd, p->fd);
1085         }
1086
1087         ret = select (max_fd + 1,
1088                       &readset, NULL, NULL, &to);
1089         if (ret < 0) {
1090             if (errno == EINTR)
1091                 continue;
1092             else
1093                 krb5_err (context, 1, errno, "select");
1094         }
1095
1096         if (ret == 0) {
1097             old_version = current_version;
1098             flock(log_fd, LOCK_SH);
1099             kadm5_log_get_version_fd (log_fd, &current_version);
1100             flock(log_fd, LOCK_UN);
1101
1102             if (current_version > old_version) {
1103                 krb5_warnx(context,
1104                            "Missed a signal, updating slaves %lu to %lu",
1105                            (unsigned long)old_version,
1106                            (unsigned long)current_version);
1107                 for (p = slaves; p != NULL; p = p->next) {
1108                     if (p->flags & SLAVE_F_DEAD)
1109                         continue;
1110                     send_diffs (context, p, log_fd, database, current_version);
1111                 }
1112             }
1113         }
1114
1115         if (ret && FD_ISSET(signal_fd, &readset)) {
1116 #ifndef NO_UNIX_SOCKETS
1117             struct sockaddr_un peer_addr;
1118 #else
1119             struct sockaddr_storage peer_addr;
1120 #endif
1121             socklen_t peer_len = sizeof(peer_addr);
1122
1123             if(recvfrom(signal_fd, (void *)&vers, sizeof(vers), 0,
1124                         (struct sockaddr *)&peer_addr, &peer_len) < 0) {
1125                 krb5_warn (context, errno, "recvfrom");
1126                 continue;
1127             }
1128             --ret;
1129             assert(ret >= 0);
1130             old_version = current_version;
1131             flock(log_fd, LOCK_SH);
1132             kadm5_log_get_version_fd (log_fd, &current_version);
1133             flock(log_fd, LOCK_UN);
1134             if (current_version > old_version) {
1135                 krb5_warnx(context,
1136                            "Got a signal, updating slaves %lu to %lu",
1137                            (unsigned long)old_version,
1138                            (unsigned long)current_version);
1139                 for (p = slaves; p != NULL; p = p->next) {
1140                     if (p->flags & SLAVE_F_DEAD)
1141                         continue;
1142                     send_diffs (context, p, log_fd, database, current_version);
1143                 }
1144             } else {
1145                 krb5_warnx(context,
1146                            "Got a signal, but no update in log version %lu",
1147                            (unsigned long)current_version);
1148             }
1149         }
1150
1151         for(p = slaves; p != NULL; p = p->next) {
1152             if (p->flags & SLAVE_F_DEAD)
1153                 continue;
1154             if (ret && FD_ISSET(p->fd, &readset)) {
1155                 --ret;
1156                 assert(ret >= 0);
1157                 if(process_msg (context, p, log_fd, database, current_version))
1158                     slave_dead(context, p);
1159             } else if (slave_gone_p (p))
1160                 slave_dead(context, p);
1161             else if (slave_missing_p (p))
1162                 send_are_you_there (context, p);
1163         }
1164
1165         if (ret && FD_ISSET(listen_fd, &readset)) {
1166             add_slave (context, keytab, &slaves, listen_fd);
1167             --ret;
1168             assert(ret >= 0);
1169         }
1170         write_stats(context, slaves, current_version);
1171     }
1172
1173     if(exit_flag == SIGINT || exit_flag == SIGTERM)
1174         krb5_warnx(context, "%s terminated", getprogname());
1175 #ifdef SIGXCPU
1176     else if(exit_flag == SIGXCPU)
1177         krb5_warnx(context, "%s CPU time limit exceeded", getprogname());
1178 #endif
1179     else
1180         krb5_warnx(context, "%s unexpected exit reason: %ld",
1181                    getprogname(), (long)exit_flag);
1182
1183     write_master_down(context);
1184
1185     return 0;
1186 }