usr.sbin/nscd/nscd.c

   1 /*-
   2  * Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in thereg
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <sys/param.h>
  32 #include <sys/event.h>
  33 #include <sys/socket.h>
  34 #include <sys/stat.h>
  35 #include <sys/time.h>
  36 #include <sys/un.h>
  37
  38 #include <assert.h>
  39 #include <err.h>
  40 #include <errno.h>
  41 #include <fcntl.h>
  42 #include <libutil.h>
  43 #include <pthread.h>
  44 #include <signal.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49
  50 #include "agents/passwd.h"
  51 #include "agents/group.h"
  52 #include "agents/services.h"
  53 #include "cachelib.h"
  54 #include "config.h"
  55 #include "debug.h"
  56 #include "log.h"
  57 #include "nscdcli.h"
  58 #include "parser.h"
  59 #include "query.h"
  60 #include "singletons.h"
  61
  62 #ifndef CONFIG_PATH
  63 #define CONFIG_PATH "/etc/nscd.conf"
  64 #endif
  65 #define DEFAULT_CONFIG_PATH     "nscd.conf"
  66
  67 #define MAX_SOCKET_IO_SIZE      4096
  68
  69 struct processing_thread_args {
  70         cache   the_cache;
  71         struct configuration    *the_configuration;
  72         struct runtime_env              *the_runtime_env;
  73 };
  74
  75 static void accept_connection(struct kevent *, struct runtime_env *,
  76         struct configuration *);
  77 static void destroy_cache_(cache);
  78 static void destroy_runtime_env(struct runtime_env *);
  79 static cache init_cache_(struct configuration *);
  80 static struct runtime_env *init_runtime_env(struct configuration *);
  81 static void processing_loop(cache, struct runtime_env *,
  82         struct configuration *);
  83 static void process_socket_event(struct kevent *, struct runtime_env *,
  84         struct configuration *);
  85 static void process_timer_event(struct kevent *, struct runtime_env *,
  86         struct configuration *);
  87 static void *processing_thread(void *);
  88 static void usage(void);
  89
  90 void get_time_func(struct timeval *);
  91
  92 static void
  93 usage(void)
  94 {
  95         fprintf(stderr,
  96             "usage: nscd [-dnst] [-i cachename] [-I cachename]\n");
  97         exit(1);
  98 }
  99
 100 static cache
 101 init_cache_(struct configuration *config)
 102 {
 103         struct cache_params params;
 104         cache retval;
 105
 106         struct configuration_entry *config_entry;
 107         size_t  size, i;
 108         int res;
 109
 110         TRACE_IN(init_cache_);
 111
 112         memset(&params, 0, sizeof(struct cache_params));
 113         params.get_time_func = get_time_func;
 114         retval = init_cache(&params);
 115
 116         size = configuration_get_entries_size(config);
 117         for (i = 0; i < size; ++i) {
 118                 config_entry = configuration_get_entry(config, i);
 119                 /*
 120                  * We should register common entries now - multipart entries
 121                  * would be registered automatically during the queries.
 122                  */
 123                 res = register_cache_entry(retval, (struct cache_entry_params *)
 124                         &config_entry->positive_cache_params);
 125                 config_entry->positive_cache_entry = find_cache_entry(retval,
 126                         config_entry->positive_cache_params.cep.entry_name);
 127                 assert(config_entry->positive_cache_entry !=
 128                         INVALID_CACHE_ENTRY);
 129
 130                 res = register_cache_entry(retval, (struct cache_entry_params *)
 131                         &config_entry->negative_cache_params);
 132                 config_entry->negative_cache_entry = find_cache_entry(retval,
 133                         config_entry->negative_cache_params.cep.entry_name);
 134                 assert(config_entry->negative_cache_entry !=
 135                         INVALID_CACHE_ENTRY);
 136         }
 137
 138         LOG_MSG_2("cache", "cache was successfully initialized");
 139         TRACE_OUT(init_cache_);
 140         return (retval);
 141 }
 142
 143 static void
 144 destroy_cache_(cache the_cache)
 145 {
 146         TRACE_IN(destroy_cache_);
 147         destroy_cache(the_cache);
 148         TRACE_OUT(destroy_cache_);
 149 }
 150
 151 /*
 152  * Socket and kqueues are prepared here. We have one global queue for both
 153  * socket and timers events.
 154  */
 155 static struct runtime_env *
 156 init_runtime_env(struct configuration *config)
 157 {
 158         int serv_addr_len;
 159         struct sockaddr_un serv_addr;
 160
 161         struct kevent eventlist;
 162         struct timespec timeout;
 163
 164         struct runtime_env *retval;
 165
 166         TRACE_IN(init_runtime_env);
 167         retval = calloc(1, sizeof(*retval));
 168         assert(retval != NULL);
 169
 170         retval->sockfd = socket(PF_LOCAL, SOCK_STREAM|SOCK_NONBLOCK, 0);
 171
 172         if (config->force_unlink == 1)
 173                 unlink(config->socket_path);
 174
 175         memset(&serv_addr, 0, sizeof(struct sockaddr_un));
 176         serv_addr.sun_family = PF_LOCAL;
 177         strlcpy(serv_addr.sun_path, config->socket_path,
 178                 sizeof(serv_addr.sun_path));
 179         serv_addr_len = sizeof(serv_addr.sun_family) +
 180                 strlen(serv_addr.sun_path) + 1;
 181
 182         if (bind(retval->sockfd, (struct sockaddr *)&serv_addr,
 183                 serv_addr_len) == -1) {
 184                 close(retval->sockfd);
 185                 free(retval);
 186
 187                 LOG_ERR_2("runtime environment", "can't bind socket to path: "
 188                         "%s", config->socket_path);
 189                 TRACE_OUT(init_runtime_env);
 190                 return (NULL);
 191         }
 192         LOG_MSG_2("runtime environment", "using socket %s",
 193                 config->socket_path);
 194
 195         /*
 196          * Here we're marking socket as non-blocking and setting its backlog
 197          * to the maximum value
 198          */
 199         chmod(config->socket_path, config->socket_mode);
 200         listen(retval->sockfd, -1);
 201
 202         retval->queue = kqueue();
 203         assert(retval->queue != -1);
 204
 205         EV_SET(&eventlist, retval->sockfd, EVFILT_READ, EV_ADD | EV_ONESHOT,
 206                 0, 0, 0);
 207         memset(&timeout, 0, sizeof(struct timespec));
 208         kevent(retval->queue, &eventlist, 1, NULL, 0, &timeout);
 209
 210         LOG_MSG_2("runtime environment", "successfully initialized");
 211         TRACE_OUT(init_runtime_env);
 212         return (retval);
 213 }
 214
 215 static void
 216 destroy_runtime_env(struct runtime_env *env)
 217 {
 218         TRACE_IN(destroy_runtime_env);
 219         close(env->queue);
 220         close(env->sockfd);
 221         free(env);
 222         TRACE_OUT(destroy_runtime_env);
 223 }
 224
 225 static void
 226 accept_connection(struct kevent *event_data, struct runtime_env *env,
 227         struct configuration *config)
 228 {
 229         struct kevent   eventlist[2];
 230         struct timespec timeout;
 231         struct query_state      *qstate;
 232
 233         int     fd;
 234         int     res;
 235
 236         uid_t   euid;
 237         gid_t   egid;
 238
 239         TRACE_IN(accept_connection);
 240         fd = accept(event_data->ident, NULL, NULL);
 241         if (fd == -1) {
 242                 LOG_ERR_2("accept_connection", "error %d during accept()",
 243                     errno);
 244                 TRACE_OUT(accept_connection);
 245                 return;
 246         }
 247
 248         if (getpeereid(fd, &euid, &egid) != 0) {
 249                 LOG_ERR_2("accept_connection", "error %d during getpeereid()",
 250                         errno);
 251                 TRACE_OUT(accept_connection);
 252                 return;
 253         }
 254
 255         qstate = init_query_state(fd, sizeof(int), euid, egid);
 256         if (qstate == NULL) {
 257                 LOG_ERR_2("accept_connection", "can't init query_state");
 258                 TRACE_OUT(accept_connection);
 259                 return;
 260         }
 261
 262         memset(&timeout, 0, sizeof(struct timespec));
 263         EV_SET(&eventlist[0], fd, EVFILT_TIMER, EV_ADD | EV_ONESHOT,
 264                 0, qstate->timeout.tv_sec * 1000, qstate);
 265         EV_SET(&eventlist[1], fd, EVFILT_READ, EV_ADD | EV_ONESHOT,
 266                 NOTE_LOWAT, qstate->kevent_watermark, qstate);
 267         res = kevent(env->queue, eventlist, 2, NULL, 0, &timeout);
 268         if (res < 0)
 269                 LOG_ERR_2("accept_connection", "kevent error");
 270
 271         TRACE_OUT(accept_connection);
 272 }
 273
 274 static void
 275 process_socket_event(struct kevent *event_data, struct runtime_env *env,
 276         struct configuration *config)
 277 {
 278         struct kevent   eventlist[2];
 279         struct timeval  query_timeout;
 280         struct timespec kevent_timeout;
 281         int     nevents;
 282         int     eof_res, res;
 283         ssize_t io_res;
 284         struct query_state *qstate;
 285
 286         TRACE_IN(process_socket_event);
 287         eof_res = event_data->flags & EV_EOF ? 1 : 0;
 288         res = 0;
 289
 290         memset(&kevent_timeout, 0, sizeof(struct timespec));
 291         EV_SET(&eventlist[0], event_data->ident, EVFILT_TIMER, EV_DELETE,
 292                 0, 0, NULL);
 293         nevents = kevent(env->queue, eventlist, 1, NULL, 0, &kevent_timeout);
 294         if (nevents == -1) {
 295                 if (errno == ENOENT) {
 296                         /* the timer is already handling this event */
 297                         TRACE_OUT(process_socket_event);
 298                         return;
 299                 } else {
 300                         /* some other error happened */
 301                         LOG_ERR_2("process_socket_event", "kevent error, errno"
 302                                 " is %d", errno);
 303                         TRACE_OUT(process_socket_event);
 304                         return;
 305                 }
 306         }
 307         qstate = (struct query_state *)event_data->udata;
 308
 309         /*
 310          * If the buffer that is to be send/received is too large,
 311          * we send it implicitly, by using query_io_buffer_read and
 312          * query_io_buffer_write functions in the query_state. These functions
 313          * use the temporary buffer, which is later send/received in parts.
 314          * The code below implements buffer splitting/mergind for send/receive
 315          * operations. It also does the actual socket IO operations.
 316          */
 317         if (((qstate->use_alternate_io == 0) &&
 318                 (qstate->kevent_watermark <= (size_t)event_data->data)) ||
 319                 ((qstate->use_alternate_io != 0) &&
 320                 (qstate->io_buffer_watermark <= (size_t)event_data->data))) {
 321                 if (qstate->use_alternate_io != 0) {
 322                         switch (qstate->io_buffer_filter) {
 323                         case EVFILT_READ:
 324                                 io_res = query_socket_read(qstate,
 325                                         qstate->io_buffer_p,
 326                                         qstate->io_buffer_watermark);
 327                                 if (io_res < 0) {
 328                                         qstate->use_alternate_io = 0;
 329                                         qstate->process_func = NULL;
 330                                 } else {
 331                                         qstate->io_buffer_p += io_res;
 332                                         if (qstate->io_buffer_p ==
 333                                                 qstate->io_buffer +
 334                                                 qstate->io_buffer_size) {
 335                                                 qstate->io_buffer_p =
 336                                                     qstate->io_buffer;
 337                                                 qstate->use_alternate_io = 0;
 338                                         }
 339                                 }
 340                         break;
 341                         default:
 342                         break;
 343                         }
 344                 }
 345
 346                 if (qstate->use_alternate_io == 0) {
 347                         do {
 348                                 res = qstate->process_func(qstate);
 349                         } while ((qstate->kevent_watermark == 0) &&
 350                                         (qstate->process_func != NULL) &&
 351                                         (res == 0));
 352
 353                         if (res != 0)
 354                                 qstate->process_func = NULL;
 355                 }
 356
 357                 if ((qstate->use_alternate_io != 0) &&
 358                         (qstate->io_buffer_filter == EVFILT_WRITE)) {
 359                         io_res = query_socket_write(qstate, qstate->io_buffer_p,
 360                                 qstate->io_buffer_watermark);
 361                         if (io_res < 0) {
 362                                 qstate->use_alternate_io = 0;
 363                                 qstate->process_func = NULL;
 364                         } else
 365                                 qstate->io_buffer_p += io_res;
 366                 }
 367         } else {
 368                 /* assuming that socket was closed */
 369                 qstate->process_func = NULL;
 370                 qstate->use_alternate_io = 0;
 371         }
 372
 373         if (((qstate->process_func == NULL) &&
 374                 (qstate->use_alternate_io == 0)) ||
 375                 (eof_res != 0) || (res != 0)) {
 376                 destroy_query_state(qstate);
 377                 close(event_data->ident);
 378                 TRACE_OUT(process_socket_event);
 379                 return;
 380         }
 381
 382         /* updating the query_state lifetime variable */
 383         get_time_func(&query_timeout);
 384         query_timeout.tv_usec = 0;
 385         query_timeout.tv_sec -= qstate->creation_time.tv_sec;
 386         if (query_timeout.tv_sec > qstate->timeout.tv_sec)
 387                 query_timeout.tv_sec = 0;
 388         else
 389                 query_timeout.tv_sec = qstate->timeout.tv_sec -
 390                         query_timeout.tv_sec;
 391
 392         if ((qstate->use_alternate_io != 0) && (qstate->io_buffer_p ==
 393                 qstate->io_buffer + qstate->io_buffer_size))
 394                 qstate->use_alternate_io = 0;
 395
 396         if (qstate->use_alternate_io == 0) {
 397                 /*
 398                  * If we must send/receive the large block of data,
 399                  * we should prepare the query_state's io_XXX fields.
 400                  * We should also substitute its write_func and read_func
 401                  * with the query_io_buffer_write and query_io_buffer_read,
 402                  * which will allow us to implicitly send/receive this large
 403                  * buffer later (in the subsequent calls to the
 404                  * process_socket_event).
 405                  */
 406                 if (qstate->kevent_watermark > MAX_SOCKET_IO_SIZE) {
 407                         if (qstate->io_buffer != NULL)
 408                                 free(qstate->io_buffer);
 409
 410                         qstate->io_buffer = calloc(1,
 411                                 qstate->kevent_watermark);
 412                         assert(qstate->io_buffer != NULL);
 413
 414                         qstate->io_buffer_p = qstate->io_buffer;
 415                         qstate->io_buffer_size = qstate->kevent_watermark;
 416                         qstate->io_buffer_filter = qstate->kevent_filter;
 417
 418                         qstate->write_func = query_io_buffer_write;
 419                         qstate->read_func = query_io_buffer_read;
 420
 421                         if (qstate->kevent_filter == EVFILT_READ)
 422                                 qstate->use_alternate_io = 1;
 423
 424                         qstate->io_buffer_watermark = MAX_SOCKET_IO_SIZE;
 425                         EV_SET(&eventlist[1], event_data->ident,
 426                                 qstate->kevent_filter, EV_ADD | EV_ONESHOT,
 427                                 NOTE_LOWAT, MAX_SOCKET_IO_SIZE, qstate);
 428                 } else {
 429                         EV_SET(&eventlist[1], event_data->ident,
 430                                 qstate->kevent_filter, EV_ADD | EV_ONESHOT,
 431                                 NOTE_LOWAT, qstate->kevent_watermark, qstate);
 432                 }
 433         } else {
 434                 if (qstate->io_buffer + qstate->io_buffer_size -
 435                         qstate->io_buffer_p <
 436                         MAX_SOCKET_IO_SIZE) {
 437                         qstate->io_buffer_watermark = qstate->io_buffer +
 438                                 qstate->io_buffer_size - qstate->io_buffer_p;
 439                         EV_SET(&eventlist[1], event_data->ident,
 440                                 qstate->io_buffer_filter,
 441                                 EV_ADD | EV_ONESHOT, NOTE_LOWAT,
 442                                 qstate->io_buffer_watermark,
 443                                 qstate);
 444                 } else {
 445                         qstate->io_buffer_watermark = MAX_SOCKET_IO_SIZE;
 446                         EV_SET(&eventlist[1], event_data->ident,
 447                                 qstate->io_buffer_filter, EV_ADD | EV_ONESHOT,
 448                                 NOTE_LOWAT, MAX_SOCKET_IO_SIZE, qstate);
 449                 }
 450         }
 451         EV_SET(&eventlist[0], event_data->ident, EVFILT_TIMER,
 452                 EV_ADD | EV_ONESHOT, 0, query_timeout.tv_sec * 1000, qstate);
 453         kevent(env->queue, eventlist, 2, NULL, 0, &kevent_timeout);
 454
 455         TRACE_OUT(process_socket_event);
 456 }
 457
 458 /*
 459  * This routine is called if timer event has been signaled in the kqueue. It
 460  * just closes the socket and destroys the query_state.
 461  */
 462 static void
 463 process_timer_event(struct kevent *event_data, struct runtime_env *env,
 464         struct configuration *config)
 465 {
 466         struct query_state      *qstate;
 467
 468         TRACE_IN(process_timer_event);
 469         qstate = (struct query_state *)event_data->udata;
 470         destroy_query_state(qstate);
 471         close(event_data->ident);
 472         TRACE_OUT(process_timer_event);
 473 }
 474
 475 /*
 476  * Processing loop is the basic processing routine, that forms a body of each
 477  * procssing thread
 478  */
 479 static void
 480 processing_loop(cache the_cache, struct runtime_env *env,
 481         struct configuration *config)
 482 {
 483         struct timespec timeout;
 484         const int eventlist_size = 1;
 485         struct kevent eventlist[eventlist_size];
 486         int nevents, i;
 487
 488         TRACE_MSG("=> processing_loop");
 489         memset(&timeout, 0, sizeof(struct timespec));
 490         memset(&eventlist, 0, sizeof(struct kevent) * eventlist_size);
 491
 492         for (;;) {
 493                 nevents = kevent(env->queue, NULL, 0, eventlist,
 494                         eventlist_size, NULL);
 495                 /*
 496                  * we can only receive 1 event on success
 497                  */
 498                 if (nevents == 1) {
 499                         struct kevent *event_data;
 500                         event_data = &eventlist[0];
 501
 502                         if ((int)event_data->ident == env->sockfd) {
 503                                 for (i = 0; i < event_data->data; ++i)
 504                                     accept_connection(event_data, env, config);
 505
 506                                 EV_SET(eventlist, s_runtime_env->sockfd,
 507                                     EVFILT_READ, EV_ADD | EV_ONESHOT,
 508                                     0, 0, 0);
 509                                 memset(&timeout, 0,
 510                                     sizeof(struct timespec));
 511                                 kevent(s_runtime_env->queue, eventlist,
 512                                     1, NULL, 0, &timeout);
 513
 514                         } else {
 515                                 switch (event_data->filter) {
 516                                 case EVFILT_READ:
 517                                 case EVFILT_WRITE:
 518                                         process_socket_event(event_data,
 519                                                 env, config);
 520                                         break;
 521                                 case EVFILT_TIMER:
 522                                         process_timer_event(event_data,
 523                                                 env, config);
 524                                         break;
 525                                 default:
 526                                         break;
 527                                 }
 528                         }
 529                 } else {
 530                         /* this branch shouldn't be currently executed */
 531                 }
 532         }
 533
 534         TRACE_MSG("<= processing_loop");
 535 }
 536
 537 /*
 538  * Wrapper above the processing loop function. It sets the thread signal mask
 539  * to avoid SIGPIPE signals (which can happen if the client works incorrectly).
 540  */
 541 static void *
 542 processing_thread(void *data)
 543 {
 544         struct processing_thread_args   *args;
 545         sigset_t new;
 546
 547         TRACE_MSG("=> processing_thread");
 548         args = (struct processing_thread_args *)data;
 549
 550         sigemptyset(&new);
 551         sigaddset(&new, SIGPIPE);
 552         if (pthread_sigmask(SIG_BLOCK, &new, NULL) != 0)
 553                 LOG_ERR_1("processing thread",
 554                         "thread can't block the SIGPIPE signal");
 555
 556         processing_loop(args->the_cache, args->the_runtime_env,
 557                 args->the_configuration);
 558         free(args);
 559         TRACE_MSG("<= processing_thread");
 560
 561         return (NULL);
 562 }
 563
 564 void
 565 get_time_func(struct timeval *time)
 566 {
 567         struct timespec res;
 568         memset(&res, 0, sizeof(struct timespec));
 569         clock_gettime(CLOCK_MONOTONIC, &res);
 570
 571         time->tv_sec = res.tv_sec;
 572         time->tv_usec = 0;
 573 }
 574
 575 /*
 576  * The idea of _nss_cache_cycle_prevention_function is that nsdispatch
 577  * will search for this symbol in the executable. This symbol is the
 578  * attribute of the caching daemon. So, if it exists, nsdispatch won't try
 579  * to connect to the caching daemon and will just ignore the 'cache'
 580  * source in the nsswitch.conf. This method helps to avoid cycles and
 581  * organize self-performing requests.
 582  *
 583  * (not actually a function; it used to be, but it doesn't make any
 584  * difference, as long as it has external linkage)
 585  */
 586 void *_nss_cache_cycle_prevention_function;
 587
 588 int
 589 main(int argc, char *argv[])
 590 {
 591         struct processing_thread_args *thread_args;
 592         pthread_t *threads;
 593
 594         struct pidfh *pidfile;
 595         pid_t pid;
 596
 597         char const *config_file;
 598         char const *error_str;
 599         int error_line;
 600         int i, res;
 601
 602         int trace_mode_enabled;
 603         int force_single_threaded;
 604         int do_not_daemonize;
 605         int clear_user_cache_entries, clear_all_cache_entries;
 606         char *user_config_entry_name, *global_config_entry_name;
 607         int show_statistics;
 608         int daemon_mode, interactive_mode;
 609
 610
 611         /* by default all debug messages are omitted */
 612         TRACE_OFF();
 613
 614         /* parsing command line arguments */
 615         trace_mode_enabled = 0;
 616         force_single_threaded = 0;
 617         do_not_daemonize = 0;
 618         clear_user_cache_entries = 0;
 619         clear_all_cache_entries = 0;
 620         show_statistics = 0;
 621         user_config_entry_name = NULL;
 622         global_config_entry_name = NULL;
 623         while ((res = getopt(argc, argv, "nstdi:I:")) != -1) {
 624                 switch (res) {
 625                 case 'n':
 626                         do_not_daemonize = 1;
 627                         break;
 628                 case 's':
 629                         force_single_threaded = 1;
 630                         break;
 631                 case 't':
 632                         trace_mode_enabled = 1;
 633                         break;
 634                 case 'i':
 635                         clear_user_cache_entries = 1;
 636                         if (optarg != NULL)
 637                                 if (strcmp(optarg, "all") != 0)
 638                                         user_config_entry_name = strdup(optarg);
 639                         break;
 640                 case 'I':
 641                         clear_all_cache_entries = 1;
 642                         if (optarg != NULL)
 643                                 if (strcmp(optarg, "all") != 0)
 644                                         global_config_entry_name =
 645                                                 strdup(optarg);
 646                         break;
 647                 case 'd':
 648                         show_statistics = 1;
 649                         break;
 650                 case '?':
 651                 default:
 652                         usage();
 653                         /* NOT REACHED */
 654                 }
 655         }
 656
 657         daemon_mode = do_not_daemonize | force_single_threaded |
 658                 trace_mode_enabled;
 659         interactive_mode = clear_user_cache_entries | clear_all_cache_entries |
 660                 show_statistics;
 661
 662         if ((daemon_mode != 0) && (interactive_mode != 0)) {
 663                 LOG_ERR_1("main", "daemon mode and interactive_mode arguments "
 664                         "can't be used together");
 665                 usage();
 666         }
 667
 668         if (interactive_mode != 0) {
 669                 FILE *pidfin = fopen(DEFAULT_PIDFILE_PATH, "r");
 670                 char pidbuf[256];
 671
 672                 struct nscd_connection_params connection_params;
 673                 nscd_connection connection;
 674
 675                 int result;
 676
 677                 if (pidfin == NULL)
 678                         errx(EXIT_FAILURE, "There is no daemon running.");
 679
 680                 memset(pidbuf, 0, sizeof(pidbuf));
 681                 fread(pidbuf, sizeof(pidbuf) - 1, 1, pidfin);
 682                 fclose(pidfin);
 683
 684                 if (ferror(pidfin) != 0)
 685                         errx(EXIT_FAILURE, "Can't read from pidfile.");
 686
 687                 if (sscanf(pidbuf, "%d", &pid) != 1)
 688                         errx(EXIT_FAILURE, "Invalid pidfile.");
 689                 LOG_MSG_1("main", "daemon PID is %d", pid);
 690
 691
 692                 memset(&connection_params, 0,
 693                         sizeof(struct nscd_connection_params));
 694                 connection_params.socket_path = DEFAULT_SOCKET_PATH;
 695                 connection = open_nscd_connection__(&connection_params);
 696                 if (connection == INVALID_NSCD_CONNECTION)
 697                         errx(EXIT_FAILURE, "Can't connect to the daemon.");
 698
 699                 if (clear_user_cache_entries != 0) {
 700                         result = nscd_transform__(connection,
 701                                 user_config_entry_name, TT_USER);
 702                         if (result != 0)
 703                                 LOG_MSG_1("main",
 704                                         "user cache transformation failed");
 705                         else
 706                                 LOG_MSG_1("main",
 707                                         "user cache_transformation "
 708                                         "succeeded");
 709                 }
 710
 711                 if (clear_all_cache_entries != 0) {
 712                         if (geteuid() != 0)
 713                                 errx(EXIT_FAILURE, "Only root can initiate "
 714                                         "global cache transformation.");
 715
 716                         result = nscd_transform__(connection,
 717                                 global_config_entry_name, TT_ALL);
 718                         if (result != 0)
 719                                 LOG_MSG_1("main",
 720                                         "global cache transformation "
 721                                         "failed");
 722                         else
 723                                 LOG_MSG_1("main",
 724                                         "global cache transformation "
 725                                         "succeeded");
 726                 }
 727
 728                 close_nscd_connection__(connection);
 729
 730                 free(user_config_entry_name);
 731                 free(global_config_entry_name);
 732                 return (EXIT_SUCCESS);
 733         }
 734
 735         pidfile = pidfile_open(DEFAULT_PIDFILE_PATH, 0644, &pid);
 736         if (pidfile == NULL) {
 737                 if (errno == EEXIST)
 738                         errx(EXIT_FAILURE, "Daemon already running, pid: %d.",
 739                                 pid);
 740                 warn("Cannot open or create pidfile");
 741         }
 742
 743         if (trace_mode_enabled == 1)
 744                 TRACE_ON();
 745
 746         /* blocking the main thread from receiving SIGPIPE signal */
 747         sigblock(sigmask(SIGPIPE));
 748
 749         /* daemonization */
 750         if (do_not_daemonize == 0) {
 751                 res = daemon(0, trace_mode_enabled == 0 ? 0 : 1);
 752                 if (res != 0) {
 753                         LOG_ERR_1("main", "can't daemonize myself: %s",
 754                                 strerror(errno));
 755                         pidfile_remove(pidfile);
 756                         goto fin;
 757                 } else
 758                         LOG_MSG_1("main", "successfully daemonized");
 759         }
 760
 761         pidfile_write(pidfile);
 762
 763         s_agent_table = init_agent_table();
 764         register_agent(s_agent_table, init_passwd_agent());
 765         register_agent(s_agent_table, init_passwd_mp_agent());
 766         register_agent(s_agent_table, init_group_agent());
 767         register_agent(s_agent_table, init_group_mp_agent());
 768         register_agent(s_agent_table, init_services_agent());
 769         register_agent(s_agent_table, init_services_mp_agent());
 770         LOG_MSG_1("main", "request agents registered successfully");
 771
 772         /*
 773          * Hosts agent can't work properly until we have access to the
 774          * appropriate dtab structures, which are used in nsdispatch
 775          * calls
 776          *
 777          register_agent(s_agent_table, init_hosts_agent());
 778         */
 779
 780         /* configuration initialization */
 781         s_configuration = init_configuration();
 782         fill_configuration_defaults(s_configuration);
 783
 784         error_str = NULL;
 785         error_line = 0;
 786         config_file = CONFIG_PATH;
 787
 788         res = parse_config_file(s_configuration, config_file, &error_str,
 789                 &error_line);
 790         if ((res != 0) && (error_str == NULL)) {
 791                 config_file = DEFAULT_CONFIG_PATH;
 792                 res = parse_config_file(s_configuration, config_file,
 793                         &error_str, &error_line);
 794         }
 795
 796         if (res != 0) {
 797                 if (error_str != NULL) {
 798                 LOG_ERR_1("main", "error in configuration file(%s, %d): %s\n",
 799                         config_file, error_line, error_str);
 800                 } else {
 801                 LOG_ERR_1("main", "no configuration file found "
 802                         "- was looking for %s and %s",
 803                         CONFIG_PATH, DEFAULT_CONFIG_PATH);
 804                 }
 805                 destroy_configuration(s_configuration);
 806                 return (-1);
 807         }
 808
 809         if (force_single_threaded == 1)
 810                 s_configuration->threads_num = 1;
 811
 812         /* cache initialization */
 813         s_cache = init_cache_(s_configuration);
 814         if (s_cache == NULL) {
 815                 LOG_ERR_1("main", "can't initialize the cache");
 816                 destroy_configuration(s_configuration);
 817                 return (-1);
 818         }
 819
 820         /* runtime environment initialization */
 821         s_runtime_env = init_runtime_env(s_configuration);
 822         if (s_runtime_env == NULL) {
 823                 LOG_ERR_1("main", "can't initialize the runtime environment");
 824                 destroy_configuration(s_configuration);
 825                 destroy_cache_(s_cache);
 826                 return (-1);
 827         }
 828
 829         if (s_configuration->threads_num > 1) {
 830                 threads = calloc(1, sizeof(*threads) *
 831                         s_configuration->threads_num);
 832                 for (i = 0; i < s_configuration->threads_num; ++i) {
 833                         thread_args = malloc(
 834                                 sizeof(*thread_args));
 835                         thread_args->the_cache = s_cache;
 836                         thread_args->the_runtime_env = s_runtime_env;
 837                         thread_args->the_configuration = s_configuration;
 838
 839                         LOG_MSG_1("main", "thread #%d was successfully created",
 840                                 i);
 841                         pthread_create(&threads[i], NULL, processing_thread,
 842                                 thread_args);
 843
 844                         thread_args = NULL;
 845                 }
 846
 847                 for (i = 0; i < s_configuration->threads_num; ++i)
 848                         pthread_join(threads[i], NULL);
 849         } else {
 850                 LOG_MSG_1("main", "working in single-threaded mode");
 851                 processing_loop(s_cache, s_runtime_env, s_configuration);
 852         }
 853
 854 fin:
 855         /* runtime environment destruction */
 856         destroy_runtime_env(s_runtime_env);
 857
 858         /* cache destruction */
 859         destroy_cache_(s_cache);
 860
 861         /* configuration destruction */
 862         destroy_configuration(s_configuration);
 863
 864         /* agents table destruction */
 865         destroy_agent_table(s_agent_table);
 866
 867         pidfile_remove(pidfile);
 868         return (EXIT_SUCCESS);
 869 }