1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25 
  26 /*
  27  * Copyright (c) 2012, Joyent, Inc. All rights reserved.
  28  */
  29 
  30 #include <assert.h>
  31 #include <door.h>
  32 #include <errno.h>
  33 #include <fcntl.h>
  34 #include <limits.h>
  35 #include <priv.h>
  36 #include <procfs.h>
  37 #include <pthread.h>
  38 #include <signal.h>
  39 #include <stdarg.h>
  40 #include <stdio.h>
  41 #include <stdio_ext.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <syslog.h>
  45 #include <sys/corectl.h>
  46 #include <sys/resource.h>
  47 #include <sys/stat.h>
  48 #include <sys/wait.h>
  49 #include <ucontext.h>
  50 #include <unistd.h>
  51 
  52 #include "configd.h"
  53 
  54 /*
  55  * This file manages the overall startup and shutdown of configd, as well
  56  * as managing its door thread pool and per-thread datastructures.
  57  *
  58  * 1.  Per-thread Datastructures
  59  * -----------------------------
  60  * Each configd thread has an associated thread_info_t which contains its
  61  * current state.  A pointer is kept to this in TSD, keyed by thread_info_key.
  62  * The thread_info_ts for all threads in configd are kept on a single global
  63  * list, thread_list.  After creation, the state in the thread_info structure
  64  * is only modified by the associated thread, so no locking is needed.  A TSD
  65  * destructor removes the thread_info from the global list and frees it at
  66  * pthread_exit() time.
  67  *
  68  * Threads access their per-thread data using thread_self()
  69  *
  70  * The thread_list is protected by thread_lock, a leaf lock.
  71  *
  72  * 2. Door Thread Pool Management
  73  * ------------------------------
  74  * Whenever door_return(3door) returns from the kernel and there are no
  75  * other configd threads waiting for requests, libdoor automatically
  76  * invokes a function registered with door_server_create(), to request a new
  77  * door server thread.  The default function just creates a thread that calls
  78  * door_return(3door).  Unfortunately, since it can take a while for the new
  79  * thread to *get* to door_return(3door), a stream of requests can cause a
  80  * large number of threads to be created, even though they aren't all needed.
  81  *
  82  * In our callback, new_server_needed(), we limit ourself to two new threads
  83  * at a time -- this logic is handled in reserve_new_thread().  This keeps
  84  * us from creating an absurd number of threads in response to peaking load.
  85  */
  86 static pthread_key_t    thread_info_key;
  87 static pthread_attr_t   thread_attr;
  88 
  89 static pthread_mutex_t  thread_lock = PTHREAD_MUTEX_INITIALIZER;
  90 int                     num_started;    /* number actually running */
  91 int                     num_servers;    /* number in-progress or running */
  92 static uu_list_pool_t   *thread_pool;
  93 uu_list_t               *thread_list;
  94 
  95 static thread_info_t    main_thread_info;
  96 
  97 static int      finished;
  98 
  99 static pid_t    privileged_pid = 0;
 100 static int      privileged_psinfo_fd = -1;
 101 
 102 static int      privileged_user = 0;
 103 
 104 static priv_set_t *privileged_privs;
 105 
 106 static int      log_to_syslog = 0;
 107 
 108 int             is_main_repository = 1;
 109 
 110 int             max_repository_backups = 4;
 111 
 112 #define CONFIGD_MAX_FDS         262144
 113 
 114 const char *
 115 _umem_options_init(void)
 116 {
 117         /*
 118          * Like svc.startd, we set our UMEM_OPTIONS to indicate that we do not
 119          * wish to have per-CPU magazines to reduce our memory footprint.  And
 120          * as with svc.startd, if svc.configd is so MT-hot that this becomes a
 121          * scalability problem, there are deeper issues...
 122          */
 123         return ("nomagazines");         /* UMEM_OPTIONS setting */
 124 }
 125 
 126 /*
 127  * Thanks, Mike
 128  */
 129 void
 130 abort_handler(int sig, siginfo_t *sip, ucontext_t *ucp)
 131 {
 132         struct sigaction act;
 133 
 134         (void) sigemptyset(&act.sa_mask);
 135         act.sa_handler = SIG_DFL;
 136         act.sa_flags = 0;
 137         (void) sigaction(sig, &act, NULL);
 138 
 139         (void) printstack(2);
 140 
 141         if (sip != NULL && SI_FROMUSER(sip))
 142                 (void) pthread_kill(pthread_self(), sig);
 143         (void) sigfillset(&ucp->uc_sigmask);
 144         (void) sigdelset(&ucp->uc_sigmask, sig);
 145         ucp->uc_flags |= UC_SIGMASK;
 146         (void) setcontext(ucp);
 147 }
 148 
 149 /*
 150  * Don't want to have more than a couple thread creates outstanding
 151  */
 152 static int
 153 reserve_new_thread(void)
 154 {
 155         (void) pthread_mutex_lock(&thread_lock);
 156         assert(num_started >= 0);
 157         if (num_servers > num_started + 1) {
 158                 (void) pthread_mutex_unlock(&thread_lock);
 159                 return (0);
 160         }
 161         ++num_servers;
 162         (void) pthread_mutex_unlock(&thread_lock);
 163         return (1);
 164 }
 165 
 166 static void
 167 thread_info_free(thread_info_t *ti)
 168 {
 169         uu_list_node_fini(ti, &ti->ti_node, thread_pool);
 170         if (ti->ti_ucred != NULL)
 171                 uu_free(ti->ti_ucred);
 172         uu_free(ti);
 173 }
 174 
 175 static void
 176 thread_exiting(void *arg)
 177 {
 178         thread_info_t *ti = arg;
 179 
 180         if (ti != NULL)
 181                 log_enter(&ti->ti_log);
 182 
 183         (void) pthread_mutex_lock(&thread_lock);
 184         if (ti != NULL) {
 185                 num_started--;
 186                 uu_list_remove(thread_list, ti);
 187         }
 188         assert(num_servers > 0);
 189         --num_servers;
 190 
 191         if (num_servers == 0) {
 192                 configd_critical("no door server threads\n");
 193                 abort();
 194         }
 195         (void) pthread_mutex_unlock(&thread_lock);
 196 
 197         if (ti != NULL && ti != &main_thread_info)
 198                 thread_info_free(ti);
 199 }
 200 
 201 void
 202 thread_newstate(thread_info_t *ti, thread_state_t newstate)
 203 {
 204         ti->ti_ucred_read = 0;                       /* invalidate cached ucred */
 205         if (newstate != ti->ti_state) {
 206                 ti->ti_prev_state = ti->ti_state;
 207                 ti->ti_state = newstate;
 208                 ti->ti_lastchange = gethrtime();
 209         }
 210 }
 211 
 212 thread_info_t *
 213 thread_self(void)
 214 {
 215         return (pthread_getspecific(thread_info_key));
 216 }
 217 
 218 /*
 219  * get_ucred() returns NULL if it was unable to get the credential
 220  * information.
 221  */
 222 ucred_t *
 223 get_ucred(void)
 224 {
 225         thread_info_t *ti = thread_self();
 226         ucred_t **ret = &ti->ti_ucred;
 227 
 228         if (ti->ti_ucred_read)
 229                 return (*ret);                  /* cached value */
 230 
 231         if (door_ucred(ret) != 0)
 232                 return (NULL);
 233         ti->ti_ucred_read = 1;
 234 
 235         return (*ret);
 236 }
 237 
 238 int
 239 ucred_is_privileged(ucred_t *uc)
 240 {
 241         const priv_set_t *ps;
 242 
 243         if ((ps = ucred_getprivset(uc, PRIV_EFFECTIVE)) != NULL) {
 244                 if (priv_isfullset(ps))
 245                         return (1);             /* process has all privs */
 246 
 247                 if (privileged_privs != NULL &&
 248                     priv_issubset(privileged_privs, ps))
 249                         return (1);             /* process has zone privs */
 250         }
 251 
 252         return (0);
 253 }
 254 
 255 /*
 256  * The purpose of this function is to get the audit session data for use in
 257  * generating SMF audit events.  We use a single audit session per client.
 258  *
 259  * get_audit_session() may return NULL.  It is legal to use a NULL pointer
 260  * in subsequent calls to adt_* functions.
 261  */
 262 adt_session_data_t *
 263 get_audit_session(void)
 264 {
 265         thread_info_t   *ti = thread_self();
 266 
 267         return (ti->ti_active_client->rc_adt_session);
 268 }
 269 
 270 static void *
 271 thread_start(void *arg)
 272 {
 273         thread_info_t *ti = arg;
 274 
 275         (void) pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
 276 
 277         (void) pthread_mutex_lock(&thread_lock);
 278         num_started++;
 279         (void) uu_list_insert_after(thread_list, uu_list_last(thread_list),
 280             ti);
 281         (void) pthread_mutex_unlock(&thread_lock);
 282         (void) pthread_setspecific(thread_info_key, ti);
 283 
 284         thread_newstate(ti, TI_DOOR_RETURN);
 285 
 286         /*
 287          * Start handling door calls
 288          */
 289         (void) door_return(NULL, 0, NULL, 0);
 290         return (arg);
 291 }
 292 
 293 static void
 294 new_thread_needed(door_info_t *dip)
 295 {
 296         thread_info_t *ti;
 297 
 298         sigset_t new, old;
 299 
 300         assert(dip == NULL);
 301 
 302         if (!reserve_new_thread())
 303                 return;
 304 
 305         if ((ti = uu_zalloc(sizeof (*ti))) == NULL)
 306                 goto fail;
 307 
 308         uu_list_node_init(ti, &ti->ti_node, thread_pool);
 309         ti->ti_state = TI_CREATED;
 310         ti->ti_prev_state = TI_CREATED;
 311 
 312         if ((ti->ti_ucred = uu_zalloc(ucred_size())) == NULL)
 313                 goto fail;
 314 
 315         (void) sigfillset(&new);
 316         (void) pthread_sigmask(SIG_SETMASK, &new, &old);
 317         if ((errno = pthread_create(&ti->ti_thread, &thread_attr, thread_start,
 318             ti)) != 0) {
 319                 (void) pthread_sigmask(SIG_SETMASK, &old, NULL);
 320                 goto fail;
 321         }
 322 
 323         (void) pthread_sigmask(SIG_SETMASK, &old, NULL);
 324         return;
 325 
 326 fail:
 327         /*
 328          * Since the thread_info structure was never linked onto the
 329          * thread list, thread_exiting() can't handle the cleanup.
 330          */
 331         thread_exiting(NULL);
 332         if (ti != NULL)
 333                 thread_info_free(ti);
 334 }
 335 
 336 int
 337 create_connection(ucred_t *uc, repository_door_request_t *rp,
 338     size_t rp_size, int *out_fd)
 339 {
 340         int flags;
 341         int privileged = 0;
 342         uint32_t debugflags = 0;
 343         psinfo_t info;
 344 
 345         if (privileged_pid != 0) {
 346                 /*
 347                  * in privileged pid mode, we only allow connections from
 348                  * our original parent -- the psinfo read verifies that
 349                  * it is the same process which we started with.
 350                  */
 351                 if (ucred_getpid(uc) != privileged_pid ||
 352                     read(privileged_psinfo_fd, &info, sizeof (info)) !=
 353                     sizeof (info))
 354                         return (REPOSITORY_DOOR_FAIL_PERMISSION_DENIED);
 355 
 356                 privileged = 1;                 /* he gets full privileges */
 357         } else if (privileged_user != 0) {
 358                 /*
 359                  * in privileged user mode, only one particular user is
 360                  * allowed to connect to us, and he can do anything.
 361                  */
 362                 if (ucred_geteuid(uc) != privileged_user)
 363                         return (REPOSITORY_DOOR_FAIL_PERMISSION_DENIED);
 364 
 365                 privileged = 1;
 366         }
 367 
 368         /*
 369          * Check that rp, of size rp_size, is large enough to
 370          * contain field 'f'.  If so, write the value into *out, and return 1.
 371          * Otherwise, return 0.
 372          */
 373 #define GET_ARG(rp, rp_size, f, out)                                    \
 374         (((rp_size) >= offsetofend(repository_door_request_t, f)) ?  \
 375             ((*(out) = (rp)->f), 1) : 0)
 376 
 377         if (!GET_ARG(rp, rp_size, rdr_flags, &flags))
 378                 return (REPOSITORY_DOOR_FAIL_BAD_REQUEST);
 379 
 380 #if (REPOSITORY_DOOR_FLAG_ALL != REPOSITORY_DOOR_FLAG_DEBUG)
 381 #error Need to update flag checks
 382 #endif
 383 
 384         if (flags & ~REPOSITORY_DOOR_FLAG_ALL)
 385                 return (REPOSITORY_DOOR_FAIL_BAD_FLAG);
 386 
 387         if (flags & REPOSITORY_DOOR_FLAG_DEBUG)
 388                 if (!GET_ARG(rp, rp_size, rdr_debug, &debugflags))
 389                         return (REPOSITORY_DOOR_FAIL_BAD_REQUEST);
 390 #undef GET_ARG
 391 
 392         return (create_client(ucred_getpid(uc), debugflags, privileged,
 393             out_fd));
 394 }
 395 
 396 void
 397 configd_vlog(int severity, const char *prefix, const char *message,
 398     va_list args)
 399 {
 400         if (log_to_syslog)
 401                 vsyslog(severity, message, args);
 402         else {
 403                 flockfile(stderr);
 404                 if (prefix != NULL)
 405                         (void) fprintf(stderr, "%s", prefix);
 406                 (void) vfprintf(stderr, message, args);
 407                 if (message[0] == 0 || message[strlen(message) - 1] != '\n')
 408                         (void) fprintf(stderr, "\n");
 409                 funlockfile(stderr);
 410         }
 411 }
 412 
 413 void
 414 configd_vcritical(const char *message, va_list args)
 415 {
 416         configd_vlog(LOG_CRIT, "svc.configd: Fatal error: ", message, args);
 417 }
 418 
 419 void
 420 configd_critical(const char *message, ...)
 421 {
 422         va_list args;
 423         va_start(args, message);
 424         configd_vcritical(message, args);
 425         va_end(args);
 426 }
 427 
 428 void
 429 configd_info(const char *message, ...)
 430 {
 431         va_list args;
 432         va_start(args, message);
 433         configd_vlog(LOG_INFO, "svc.configd: ", message, args);
 434         va_end(args);
 435 }
 436 
 437 static void
 438 usage(const char *prog, int ret)
 439 {
 440         (void) fprintf(stderr,
 441             "usage: %s [-np] [-d door_path] [-r repository_path]\n"
 442             "    [-t nonpersist_repository]\n", prog);
 443         exit(ret);
 444 }
 445 
 446 /*ARGSUSED*/
 447 static void
 448 handler(int sig, siginfo_t *info, void *data)
 449 {
 450         finished = 1;
 451 }
 452 
 453 static int pipe_fd = -1;
 454 
 455 static int
 456 daemonize_start(void)
 457 {
 458         char data;
 459         int status;
 460 
 461         int filedes[2];
 462         pid_t pid;
 463 
 464         (void) close(0);
 465         (void) dup2(2, 1);              /* stderr only */
 466 
 467         if (pipe(filedes) < 0)
 468                 return (-1);
 469 
 470         if ((pid = fork1()) < 0)
 471                 return (-1);
 472 
 473         if (pid != 0) {
 474                 /*
 475                  * parent
 476                  */
 477                 struct sigaction act;
 478 
 479                 act.sa_sigaction = SIG_DFL;
 480                 (void) sigemptyset(&act.sa_mask);
 481                 act.sa_flags = 0;
 482 
 483                 (void) sigaction(SIGPIPE, &act, NULL);      /* ignore SIGPIPE */
 484 
 485                 (void) close(filedes[1]);
 486                 if (read(filedes[0], &data, 1) == 1) {
 487                         /* presume success */
 488                         _exit(CONFIGD_EXIT_OKAY);
 489                 }
 490 
 491                 status = -1;
 492                 (void) wait4(pid, &status, 0, NULL);
 493                 if (WIFEXITED(status))
 494                         _exit(WEXITSTATUS(status));
 495                 else
 496                         _exit(-1);
 497         }
 498 
 499         /*
 500          * child
 501          */
 502         pipe_fd = filedes[1];
 503         (void) close(filedes[0]);
 504 
 505         /*
 506          * generic Unix setup
 507          */
 508         (void) setsid();
 509         (void) umask(0077);
 510 
 511         return (0);
 512 }
 513 
 514 static void
 515 daemonize_ready(void)
 516 {
 517         char data = '\0';
 518 
 519         /*
 520          * wake the parent
 521          */
 522         (void) write(pipe_fd, &data, 1);
 523         (void) close(pipe_fd);
 524 }
 525 
 526 const char *
 527 regularize_path(const char *dir, const char *base, char *tmpbuf)
 528 {
 529         if (base == NULL)
 530                 return (NULL);
 531         if (base[0] == '/')
 532                 return (base);
 533 
 534         if (snprintf(tmpbuf, PATH_MAX, "%s/%s", dir, base) >= PATH_MAX) {
 535                 (void) fprintf(stderr, "svc.configd: %s/%s: path too long\n",
 536                     dir, base);
 537                 exit(CONFIGD_EXIT_BAD_ARGS);
 538         }
 539 
 540         return (tmpbuf);
 541 }
 542 
 543 int
 544 main(int argc, char *argv[])
 545 {
 546         thread_info_t *ti = &main_thread_info;
 547 
 548         char pidpath[sizeof ("/proc/" "/psinfo") + 10];
 549 
 550         struct rlimit fd_new;
 551 
 552         const char *endptr;
 553         sigset_t myset;
 554         int c;
 555         int ret;
 556         int fd;
 557 
 558         char curdir[PATH_MAX];
 559         char dbtmp[PATH_MAX];
 560         char npdbtmp[PATH_MAX];
 561         char doortmp[PATH_MAX];
 562 
 563         const char *dbpath = NULL;
 564         const char *npdbpath = NULL;
 565         const char *doorpath = REPOSITORY_DOOR_NAME;
 566         struct sigaction act;
 567 
 568         int daemonize = 1;              /* default to daemonizing */
 569         int have_npdb = 1;
 570 
 571         closefrom(3);                   /* get rid of extraneous fds */
 572 
 573         if (getcwd(curdir, sizeof (curdir)) == NULL) {
 574                 (void) fprintf(stderr,
 575                     "%s: unable to get current directory: %s\n",
 576                     argv[0], strerror(errno));
 577                 exit(CONFIGD_EXIT_INIT_FAILED);
 578         }
 579 
 580         while ((c = getopt(argc, argv, "Dnpd:r:t:")) != -1) {
 581                 switch (c) {
 582                 case 'n':
 583                         daemonize = 0;
 584                         break;
 585                 case 'd':
 586                         doorpath = regularize_path(curdir, optarg, doortmp);
 587                         have_npdb = 0;          /* default to no non-persist */
 588                         break;
 589                 case 'p':
 590                         log_to_syslog = 0;      /* don't use syslog */
 591 
 592                         /*
 593                          * If our parent exits while we're opening its /proc
 594                          * psinfo, we're vulnerable to a pid wrapping.  To
 595                          * protect against that, re-check our ppid after
 596                          * opening it.
 597                          */
 598                         privileged_pid = getppid();
 599                         (void) snprintf(pidpath, sizeof (pidpath),
 600                             "/proc/%d/psinfo", privileged_pid);
 601                         if ((fd = open(pidpath, O_RDONLY)) < 0 ||
 602                             getppid() != privileged_pid) {
 603                                 (void) fprintf(stderr,
 604                                     "%s: unable to get parent info\n", argv[0]);
 605                                 exit(CONFIGD_EXIT_BAD_ARGS);
 606                         }
 607                         privileged_psinfo_fd = fd;
 608                         break;
 609                 case 'r':
 610                         dbpath = regularize_path(curdir, optarg, dbtmp);
 611                         is_main_repository = 0;
 612                         break;
 613                 case 't':
 614                         npdbpath = regularize_path(curdir, optarg, npdbtmp);
 615                         is_main_repository = 0;
 616                         break;
 617                 default:
 618                         usage(argv[0], CONFIGD_EXIT_BAD_ARGS);
 619                         break;
 620                 }
 621         }
 622 
 623         /*
 624          * If we're not running as root, allow our euid full access, and
 625          * everyone else no access.
 626          */
 627         if (privileged_pid == 0 && geteuid() != 0) {
 628                 privileged_user = geteuid();
 629         }
 630 
 631         privileged_privs = priv_str_to_set("zone", "", &endptr);
 632         if (endptr != NULL && privileged_privs != NULL) {
 633                 priv_freeset(privileged_privs);
 634                 privileged_privs = NULL;
 635         }
 636 
 637         openlog("svc.configd", LOG_PID | LOG_CONS, LOG_DAEMON);
 638         (void) setlogmask(LOG_UPTO(LOG_NOTICE));
 639 
 640         /*
 641          * if a non-persist db is specified, always enable it
 642          */
 643         if (npdbpath)
 644                 have_npdb = 1;
 645 
 646         if (optind != argc)
 647                 usage(argv[0], CONFIGD_EXIT_BAD_ARGS);
 648 
 649         if (daemonize) {
 650                 if (getuid() == 0)
 651                         (void) chdir("/");
 652                 if (daemonize_start() < 0) {
 653                         (void) perror("unable to daemonize");
 654                         exit(CONFIGD_EXIT_INIT_FAILED);
 655                 }
 656         }
 657         if (getuid() == 0)
 658                 (void) core_set_process_path(CONFIGD_CORE,
 659                     strlen(CONFIGD_CORE) + 1, getpid());
 660 
 661         /*
 662          * this should be enabled once we can drop privileges and still get
 663          * a core dump.
 664          */
 665 #if 0
 666         /* turn off basic privileges we do not need */
 667         (void) priv_set(PRIV_OFF, PRIV_PERMITTED, PRIV_FILE_LINK_ANY,
 668             PRIV_PROC_EXEC, PRIV_PROC_FORK, PRIV_PROC_SESSION, NULL);
 669 #endif
 670 
 671         /* not that we can exec, but to be safe, shut them all off... */
 672         (void) priv_set(PRIV_SET, PRIV_INHERITABLE, NULL);
 673 
 674         (void) sigfillset(&act.sa_mask);
 675 
 676         /* signals to ignore */
 677         act.sa_sigaction = SIG_IGN;
 678         act.sa_flags = 0;
 679         (void) sigaction(SIGPIPE, &act, NULL);
 680         (void) sigaction(SIGALRM, &act, NULL);
 681         (void) sigaction(SIGUSR1, &act, NULL);
 682         (void) sigaction(SIGUSR2, &act, NULL);
 683         (void) sigaction(SIGPOLL, &act, NULL);
 684 
 685         /* signals to abort on */
 686         act.sa_sigaction = (void (*)(int, siginfo_t *, void *))&abort_handler;
 687         act.sa_flags = SA_SIGINFO;
 688 
 689         (void) sigaction(SIGABRT, &act, NULL);
 690 
 691         /* signals to handle */
 692         act.sa_sigaction = &handler;
 693         act.sa_flags = SA_SIGINFO;
 694 
 695         (void) sigaction(SIGHUP, &act, NULL);
 696         (void) sigaction(SIGINT, &act, NULL);
 697         (void) sigaction(SIGTERM, &act, NULL);
 698 
 699         (void) sigemptyset(&myset);
 700         (void) sigaddset(&myset, SIGHUP);
 701         (void) sigaddset(&myset, SIGINT);
 702         (void) sigaddset(&myset, SIGTERM);
 703 
 704         if ((errno = pthread_attr_init(&thread_attr)) != 0) {
 705                 (void) perror("initializing");
 706                 exit(CONFIGD_EXIT_INIT_FAILED);
 707         }
 708 
 709         /*
 710          * Set the hard and soft limits to CONFIGD_MAX_FDS.
 711          */
 712         fd_new.rlim_max = fd_new.rlim_cur = CONFIGD_MAX_FDS;
 713         (void) setrlimit(RLIMIT_NOFILE, &fd_new);
 714 
 715 #ifndef NATIVE_BUILD /* Allow building on snv_38 and earlier; remove later. */
 716         (void) enable_extended_FILE_stdio(-1, -1);
 717 #endif
 718 
 719         if ((ret = backend_init(dbpath, npdbpath, have_npdb)) !=
 720             CONFIGD_EXIT_OKAY)
 721                 exit(ret);
 722 
 723         if (!client_init())
 724                 exit(CONFIGD_EXIT_INIT_FAILED);
 725 
 726         if (!rc_node_init())
 727                 exit(CONFIGD_EXIT_INIT_FAILED);
 728 
 729         (void) pthread_attr_setdetachstate(&thread_attr,
 730             PTHREAD_CREATE_DETACHED);
 731         (void) pthread_attr_setscope(&thread_attr, PTHREAD_SCOPE_SYSTEM);
 732 
 733         if ((errno = pthread_key_create(&thread_info_key,
 734             thread_exiting)) != 0) {
 735                 perror("pthread_key_create");
 736                 exit(CONFIGD_EXIT_INIT_FAILED);
 737         }
 738 
 739         if ((thread_pool = uu_list_pool_create("thread_pool",
 740             sizeof (thread_info_t), offsetof(thread_info_t, ti_node),
 741             NULL, UU_LIST_POOL_DEBUG)) == NULL) {
 742                 configd_critical("uu_list_pool_create: %s\n",
 743                     uu_strerror(uu_error()));
 744                 exit(CONFIGD_EXIT_INIT_FAILED);
 745         }
 746 
 747         if ((thread_list = uu_list_create(thread_pool, NULL, 0)) == NULL) {
 748                 configd_critical("uu_list_create: %s\n",
 749                     uu_strerror(uu_error()));
 750                 exit(CONFIGD_EXIT_INIT_FAILED);
 751         }
 752 
 753         (void) memset(ti, '\0', sizeof (*ti));
 754         uu_list_node_init(ti, &ti->ti_node, thread_pool);
 755         (void) uu_list_insert_before(thread_list, uu_list_first(thread_list),
 756             ti);
 757 
 758         ti->ti_thread = pthread_self();
 759         ti->ti_state = TI_SIGNAL_WAIT;
 760         ti->ti_prev_state = TI_SIGNAL_WAIT;
 761 
 762         (void) pthread_setspecific(thread_info_key, ti);
 763 
 764         (void) door_server_create(new_thread_needed);
 765 
 766         if (!setup_main_door(doorpath)) {
 767                 configd_critical("Setting up main door failed.\n");
 768                 exit(CONFIGD_EXIT_DOOR_INIT_FAILED);
 769         }
 770 
 771         if (daemonize)
 772                 daemonize_ready();
 773 
 774         (void) pthread_sigmask(SIG_BLOCK, &myset, NULL);
 775         while (!finished) {
 776                 int sig = sigwait(&myset);
 777                 if (sig > 0) {
 778                         break;
 779                 }
 780         }
 781 
 782         backend_fini();
 783 
 784         return (CONFIGD_EXIT_OKAY);
 785 }