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  * $FreeBSD: src/usr.sbin/nscd/nscd.c,v 1.7 2008/10/23 00:27:35 delphij Exp $
  27  */
  28
  29 #include <sys/types.h>
  30 #include <sys/event.h>
  31 #include <sys/socket.h>
  32 #include <sys/time.h>
  33 #include <sys/param.h>
  34 #include <sys/un.h>
  35 #include <assert.h>
  36 #include <err.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <libutil.h>
  40 #include <pthread.h>
  41 #include <signal.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46
  47 #include "agents/passwd.h"
  48 #include "agents/group.h"
  49 #include "agents/services.h"
  50 #include "cachelib.h"
  51 #include "config.h"
  52 #include "debug.h"
  53 #include "log.h"
  54 #include "nscdcli.h"
  55 #include "parser.h"
  56 #include "query.h"
  57 #include "singletons.h"
  58
  59 #ifndef CONFIG_PATH
  60 #define CONFIG_PATH "/etc/nscd.conf"
  61 #endif
  62 #define DEFAULT_CONFIG_PATH     "nscd.conf"
  63
  64 #define MAX_SOCKET_IO_SIZE      4096
  65
  66 struct processing_thread_args {
  67         cache   the_cache;
  68         struct configuration    *the_configuration;
  69         struct runtime_env              *the_runtime_env;
  70 };
  71
  72 static void accept_connection(struct kevent *, struct runtime_env *,
  73         struct configuration *);
  74 static void destroy_cache_(cache);
  75 static void destroy_runtime_env(struct runtime_env *);
  76 static cache init_cache_(struct configuration *);
  77 static struct runtime_env *init_runtime_env(struct configuration *);
  78 static void processing_loop(cache, struct runtime_env *,
  79         struct configuration *);
  80 static void process_socket_event(struct kevent *, struct runtime_env *,
  81         struct configuration *);
  82 static void process_timer_event(struct kevent *, struct runtime_env *,
  83         struct configuration *);
  84 static void *processing_thread(void *);
  85 static void usage(void);
  86
  87 void get_time_func(struct timeval *);
  88
  89 static void
  90 usage(void)
  91 {
  92         fprintf(stderr,
  93             "usage: nscd [-dnst] [-i cachename] [-I cachename]\n");
  94         exit(1);
  95 }
  96
  97 static cache
  98 init_cache_(struct configuration *config)
  99 {
 100         struct cache_params params;
 101         cache retval;
 102
 103         struct configuration_entry *config_entry;
 104         size_t  size, i;
 105         int res;
 106
 107         TRACE_IN(init_cache_);
 108
 109         memset(&params, 0, sizeof(struct cache_params));
 110         params.get_time_func = get_time_func;
 111         retval = init_cache(&params);
 112
 113         size = configuration_get_entries_size(config);
 114         for (i = 0; i < size; ++i) {
 115                 config_entry = configuration_get_entry(config, i);
 116                 /*
 117                  * We should register common entries now - multipart entries
 118                  * would be registered automatically during the queries.
 119                  */
 120                 res = register_cache_entry(retval, (struct cache_entry_params *)
 121                         &config_entry->positive_cache_params);
 122                 config_entry->positive_cache_entry = find_cache_entry(retval,
 123                         config_entry->positive_cache_params.entry_name);
 124                 assert(config_entry->positive_cache_entry !=
 125                         INVALID_CACHE_ENTRY);
 126
 127                 res = register_cache_entry(retval, (struct cache_entry_params *)
 128                         &config_entry->negative_cache_params);
 129                 config_entry->negative_cache_entry = find_cache_entry(retval,
 130                         config_entry->negative_cache_params.entry_name);
 131                 assert(config_entry->negative_cache_entry !=
 132                         INVALID_CACHE_ENTRY);
 133         }
 134
 135         LOG_MSG_2("cache", "cache was successfully initialized");
 136         TRACE_OUT(init_cache_);
 137         return (retval);
 138 }
 139
 140 static void
 141 destroy_cache_(cache the_cache)
 142 {
 143         TRACE_IN(destroy_cache_);
 144         destroy_cache(the_cache);
 145         TRACE_OUT(destroy_cache_);
 146 }
 147
 148 /*
 149  * Socket and kqueues are prepared here. We have one global queue for both
 150  * socket and timers events.
 151  */
 152 static struct runtime_env *
 153 init_runtime_env(struct configuration *config)
 154 {
 155         int serv_addr_len;
 156         struct sockaddr_un serv_addr;
 157
 158         struct kevent eventlist;
 159         struct timespec timeout;
 160
 161         struct runtime_env *retval;
 162
 163         TRACE_IN(init_runtime_env);
 164         retval = (struct runtime_env *)calloc(1, sizeof(struct runtime_env));
 165         assert(retval != NULL);
 166
 167         retval->sockfd = socket(PF_LOCAL, SOCK_STREAM, 0);
 168
 169         if (config->force_unlink == 1)
 170                 unlink(config->socket_path);
 171
 172         memset(&serv_addr, 0, sizeof(struct sockaddr_un));
 173         serv_addr.sun_family = PF_LOCAL;
 174         strlcpy(serv_addr.sun_path, config->socket_path,
 175                 sizeof(serv_addr.sun_path));
 176         serv_addr_len = sizeof(serv_addr.sun_family) +
 177                 strlen(serv_addr.sun_path) + 1;
 178
 179         if (bind(retval->sockfd, (struct sockaddr *)&serv_addr,
 180                 serv_addr_len) == -1) {
 181                 close(retval->sockfd);
 182                 free(retval);
 183
 184                 LOG_ERR_2("runtime environment", "can't bind socket to path: "
 185                         "%s", config->socket_path);
 186                 TRACE_OUT(init_runtime_env);
 187                 return (NULL);
 188         }
 189         LOG_MSG_2("runtime environment", "using socket %s",
 190                 config->socket_path);
 191
 192         /*
 193          * Here we're marking socket as non-blocking and setting its backlog
 194          * to the maximum value
 195          */
 196         chmod(config->socket_path, config->socket_mode);
 197         listen(retval->sockfd, -1);
 198         fcntl(retval->sockfd, F_SETFL, O_NONBLOCK);
 199
 200         retval->queue = kqueue();
 201         assert(retval->queue != -1);
 202
 203         EV_SET(&eventlist, retval->sockfd, EVFILT_READ, EV_ADD | EV_ONESHOT,
 204                 0, 0, 0);
 205         memset(&timeout, 0, sizeof(struct timespec));
 206         kevent(retval->queue, &eventlist, 1, NULL, 0, &timeout);
 207
 208         LOG_MSG_2("runtime environment", "successfully initialized");
 209         TRACE_OUT(init_runtime_env);
 210         return (retval);
 211 }
 212
 213 static void
 214 destroy_runtime_env(struct runtime_env *env)
 215 {
 216         TRACE_IN(destroy_runtime_env);
 217         close(env->queue);
 218         close(env->sockfd);
 219         free(env);
 220         TRACE_OUT(destroy_runtime_env);
 221 }
 222
 223 static void
 224 accept_connection(struct kevent *event_data, struct runtime_env *env,
 225         struct configuration *config)
 226 {
 227         struct kevent   eventlist[2];
 228         struct timespec timeout;
 229         struct query_state      *qstate;
 230
 231         int     fd;
 232         int     res;
 233
 234         uid_t   euid;
 235         gid_t   egid;
 236
 237         TRACE_IN(accept_connection);
 238         fd = accept(event_data->ident, NULL, NULL);
 239         if (fd == -1) {
 240                 LOG_ERR_2("accept_connection", "error %d during accept()",
 241                     errno);
 242                 TRACE_OUT(accept_connection);
 243                 return;
 244         }
 245
 246         if (getpeereid(fd, &euid, &egid) != 0) {
 247                 LOG_ERR_2("accept_connection", "error %d during getpeereid()",
 248                         errno);
 249                 TRACE_OUT(accept_connection);
 250                 return;
 251         }
 252
 253         qstate = init_query_state(fd, sizeof(int), euid, egid);
 254         if (qstate == NULL) {
 255                 LOG_ERR_2("accept_connection", "can't init query_state");
 256                 TRACE_OUT(accept_connection);
 257                 return;
 258         }
 259
 260         memset(&timeout, 0, sizeof(struct timespec));
 261         EV_SET(&eventlist[0], fd, EVFILT_TIMER, EV_ADD | EV_ONESHOT,
 262                 0, qstate->timeout.tv_sec * 1000, qstate);
 263         EV_SET(&eventlist[1], fd, EVFILT_READ, EV_ADD | EV_ONESHOT,
 264                 NOTE_LOWAT, qstate->kevent_watermark, qstate);
 265         res = kevent(env->queue, eventlist, 2, NULL, 0, &timeout);
 266         if (res < 0)
 267                 LOG_ERR_2("accept_connection", "kevent error");
 268
 269         TRACE_OUT(accept_connection);
 270 }
 271
 272 static void
 273 process_socket_event(struct kevent *event_data, struct runtime_env *env,
 274         struct configuration *config)
 275 {
 276         struct kevent   eventlist[2];
 277         struct timeval  query_timeout;
 278         struct timespec kevent_timeout;
 279         int     nevents;
 280         int     eof_res, res;
 281         ssize_t io_res;
 282         struct query_state *qstate;
 283
 284         TRACE_IN(process_socket_event);
 285         eof_res = event_data->flags & EV_EOF ? 1 : 0;
 286         res = 0;
 287
 288         memset(&kevent_timeout, 0, sizeof(struct timespec));
 289         EV_SET(&eventlist[0], event_data->ident, EVFILT_TIMER, EV_DELETE,
 290                 0, 0, NULL);
 291         nevents = kevent(env->queue, eventlist, 1, NULL, 0, &kevent_timeout);
 292         if (nevents == -1) {
 293                 if (errno == ENOENT) {
 294                         /* the timer is already handling this event */
 295                         TRACE_OUT(process_socket_event);
 296                         return;
 297                 } else {
 298                         /* some other error happened */
 299                         LOG_ERR_2("process_socket_event", "kevent error, errno"
 300                                 " is %d", errno);
 301                         TRACE_OUT(process_socket_event);
 302                         return;
 303                 }
 304         }
 305         qstate = (struct query_state *)event_data->udata;
 306
 307         /*
 308          * If the buffer that is to be send/received is too large,
 309          * we send it implicitly, by using query_io_buffer_read and
 310          * query_io_buffer_write functions in the query_state. These functions
 311          * use the temporary buffer, which is later send/received in parts.
 312          * The code below implements buffer splitting/mergind for send/receive
 313          * operations. It also does the actual socket IO operations.
 314          */
 315         if (((qstate->use_alternate_io == 0) &&
 316                 (qstate->kevent_watermark <= event_data->data)) ||
 317                 ((qstate->use_alternate_io != 0) &&
 318                 (qstate->io_buffer_watermark <= event_data->data))) {
 319                 if (qstate->use_alternate_io != 0) {
 320                         switch (qstate->io_buffer_filter) {
 321                         case EVFILT_READ:
 322                                 io_res = query_socket_read(qstate,
 323                                         qstate->io_buffer_p,
 324                                         qstate->io_buffer_watermark);
 325                                 if (io_res < 0) {
 326                                         qstate->use_alternate_io = 0;
 327                                         qstate->process_func = NULL;
 328                                 } else {
 329                                         qstate->io_buffer_p += io_res;
 330                                         if (qstate->io_buffer_p ==
 331                                                 qstate->io_buffer +
 332                                                 qstate->io_buffer_size) {
 333                                                 qstate->io_buffer_p =
 334                                                     qstate->io_buffer;
 335                                                 qstate->use_alternate_io = 0;
 336                                         }
 337                                 }
 338                         break;
 339                         default:
 340                         break;
 341                         }
 342                 }
 343
 344                 if (qstate->use_alternate_io == 0) {
 345                         do {
 346                                 res = qstate->process_func(qstate);
 347                         } while ((qstate->kevent_watermark == 0) &&
 348                                         (qstate->process_func != NULL) &&
 349                                         (res == 0));
 350
 351                         if (res != 0)
 352                                 qstate->process_func = NULL;
 353                 }
 354
 355                 if ((qstate->use_alternate_io != 0) &&
 356                         (qstate->io_buffer_filter == EVFILT_WRITE)) {
 357                         io_res = query_socket_write(qstate, qstate->io_buffer_p,
 358                                 qstate->io_buffer_watermark);
 359                         if (io_res < 0) {
 360                                 qstate->use_alternate_io = 0;
 361                                 qstate->process_func = NULL;
 362                         } else
 363                                 qstate->io_buffer_p += io_res;
 364                 }
 365         } else {
 366                 /* assuming that socket was closed */
 367                 qstate->process_func = NULL;
 368                 qstate->use_alternate_io = 0;
 369         }
 370
 371         if (((qstate->process_func == NULL) &&
 372                 (qstate->use_alternate_io == 0)) ||
 373                 (eof_res != 0) || (res != 0)) {
 374                 destroy_query_state(qstate);
 375                 close(event_data->ident);
 376                 TRACE_OUT(process_socket_event);
 377                 return;
 378         }
 379
 380         /* updating the query_state lifetime variable */
 381         get_time_func(&query_timeout);
 382         query_timeout.tv_usec = 0;
 383         query_timeout.tv_sec -= qstate->creation_time.tv_sec;
 384         if (query_timeout.tv_sec > qstate->timeout.tv_sec)
 385                 query_timeout.tv_sec = 0;
 386         else
 387                 query_timeout.tv_sec = qstate->timeout.tv_sec -
 388                         query_timeout.tv_sec;
 389
 390         if ((qstate->use_alternate_io != 0) && (qstate->io_buffer_p ==
 391                 qstate->io_buffer + qstate->io_buffer_size))
 392                 qstate->use_alternate_io = 0;
 393
 394         if (qstate->use_alternate_io == 0) {
 395                 /*
 396                  * If we must send/receive the large block of data,
 397                  * we should prepare the query_state's io_XXX fields.
 398                  * We should also substitute its write_func and read_func
 399                  * with the query_io_buffer_write and query_io_buffer_read,
 400                  * which will allow us to implicitly send/receive this large
 401                  * buffer later (in the subsequent calls to the
 402                  * process_socket_event).
 403                  */
 404                 if (qstate->kevent_watermark > MAX_SOCKET_IO_SIZE) {
 405                         if (qstate->io_buffer != NULL)
 406                                 free(qstate->io_buffer);
 407
 408                         qstate->io_buffer = (char *)calloc(1,
 409                                 qstate->kevent_watermark);
 410                         assert(qstate->io_buffer != NULL);
 411
 412                         qstate->io_buffer_p = qstate->io_buffer;
 413                         qstate->io_buffer_size = qstate->kevent_watermark;
 414                         qstate->io_buffer_filter = qstate->kevent_filter;
 415
 416                         qstate->write_func = query_io_buffer_write;
 417                         qstate->read_func = query_io_buffer_read;
 418
 419                         if (qstate->kevent_filter == EVFILT_READ)
 420                                 qstate->use_alternate_io = 1;
 421
 422                         qstate->io_buffer_watermark = MAX_SOCKET_IO_SIZE;
 423                         EV_SET(&eventlist[1], event_data->ident,
 424                                 qstate->kevent_filter, EV_ADD | EV_ONESHOT,
 425                                 NOTE_LOWAT, MAX_SOCKET_IO_SIZE, qstate);
 426                 } else {
 427                         EV_SET(&eventlist[1], event_data->ident,
 428                                 qstate->kevent_filter, EV_ADD | EV_ONESHOT,
 429                                 NOTE_LOWAT, qstate->kevent_watermark, qstate);
 430                 }
 431         } else {
 432                 if (qstate->io_buffer + qstate->io_buffer_size -
 433                         qstate->io_buffer_p <
 434                         MAX_SOCKET_IO_SIZE) {
 435                         qstate->io_buffer_watermark = qstate->io_buffer +
 436                                 qstate->io_buffer_size - qstate->io_buffer_p;
 437                         EV_SET(&eventlist[1], event_data->ident,
 438                                 qstate->io_buffer_filter,
 439                                 EV_ADD | EV_ONESHOT, NOTE_LOWAT,
 440                                 qstate->io_buffer_watermark,
 441                                 qstate);
 442                 } else {
 443                         qstate->io_buffer_watermark = MAX_SOCKET_IO_SIZE;
 444                         EV_SET(&eventlist[1], event_data->ident,
 445                                 qstate->io_buffer_filter, EV_ADD | EV_ONESHOT,
 446                                 NOTE_LOWAT, MAX_SOCKET_IO_SIZE, qstate);
 447                 }
 448         }
 449         EV_SET(&eventlist[0], event_data->ident, EVFILT_TIMER,
 450                 EV_ADD | EV_ONESHOT, 0, query_timeout.tv_sec * 1000, qstate);
 451         kevent(env->queue, eventlist, 2, NULL, 0, &kevent_timeout);
 452
 453         TRACE_OUT(process_socket_event);
 454 }
 455
 456 /*
 457  * This routine is called if timer event has been signaled in the kqueue. It
 458  * just closes the socket and destroys the query_state.
 459  */
 460 static void
 461 process_timer_event(struct kevent *event_data, struct runtime_env *env,
 462         struct configuration *config)
 463 {
 464         struct query_state      *qstate;
 465
 466         TRACE_IN(process_timer_event);
 467         qstate = (struct query_state *)event_data->udata;
 468         destroy_query_state(qstate);
 469         close(event_data->ident);
 470         TRACE_OUT(process_timer_event);
 471 }
 472
 473 /*
 474  * Processing loop is the basic processing routine, that forms a body of each
 475  * procssing thread
 476  */
 477 static void
 478 processing_loop(cache the_cache, struct runtime_env *env,
 479         struct configuration *config)
 480 {
 481         struct timespec timeout;
 482         const int eventlist_size = 1;
 483         struct kevent eventlist[eventlist_size];
 484         int nevents, i;
 485
 486         TRACE_MSG("=> processing_loop");
 487         memset(&timeout, 0, sizeof(struct timespec));
 488         memset(&eventlist, 0, sizeof(struct kevent) * eventlist_size);
 489
 490         for (;;) {
 491                 nevents = kevent(env->queue, NULL, 0, eventlist,
 492                         eventlist_size, NULL);
 493                 /*
 494                  * we can only receive 1 event on success
 495                  */
 496                 if (nevents == 1) {
 497                         struct kevent *event_data;
 498                         event_data = &eventlist[0];
 499
 500                         if (event_data->ident == env->sockfd) {
 501                                 for (i = 0; i < event_data->data; ++i)
 502                                     accept_connection(event_data, env, config);
 503
 504                                 EV_SET(eventlist, s_runtime_env->sockfd,
 505                                     EVFILT_READ, EV_ADD | EV_ONESHOT,
 506                                     0, 0, 0);
 507                                 memset(&timeout, 0,
 508                                     sizeof(struct timespec));
 509                                 kevent(s_runtime_env->queue, eventlist,
 510                                     1, NULL, 0, &timeout);
 511
 512                         } else {
 513                                 switch (event_data->filter) {
 514                                 case EVFILT_READ:
 515                                 case EVFILT_WRITE:
 516                                         process_socket_event(event_data,
 517                                                 env, config);
 518                                         break;
 519                                 case EVFILT_TIMER:
 520                                         process_timer_event(event_data,
 521                                                 env, config);
 522                                         break;
 523                                 default:
 524                                         break;
 525                                 }
 526                         }
 527                 } else {
 528                         /* this branch shouldn't be currently executed */
 529                 }
 530         }
 531
 532         TRACE_MSG("<= processing_loop");
 533 }
 534
 535 /*
 536  * Wrapper above the processing loop function. It sets the thread signal mask
 537  * to avoid SIGPIPE signals (which can happen if the client works incorrectly).
 538  */
 539 static void *
 540 processing_thread(void *data)
 541 {
 542         struct processing_thread_args   *args;
 543         sigset_t new;
 544
 545         TRACE_MSG("=> processing_thread");
 546         args = (struct processing_thread_args *)data;
 547
 548         sigemptyset(&new);
 549         sigaddset(&new, SIGPIPE);
 550         if (pthread_sigmask(SIG_BLOCK, &new, NULL) != 0)
 551                 LOG_ERR_1("processing thread",
 552                         "thread can't block the SIGPIPE signal");
 553
 554         processing_loop(args->the_cache, args->the_runtime_env,
 555                 args->the_configuration);
 556         free(args);
 557         TRACE_MSG("<= processing_thread");
 558
 559         return (NULL);
 560 }
 561
 562 void
 563 get_time_func(struct timeval *time)
 564 {
 565         struct timespec res;
 566         memset(&res, 0, sizeof(struct timespec));
 567         clock_gettime(CLOCK_MONOTONIC, &res);
 568
 569         time->tv_sec = res.tv_sec;
 570         time->tv_usec = 0;
 571 }
 572
 573 /*
 574  * The idea of _nss_cache_cycle_prevention_function is that nsdispatch will
 575  * search for this symbol in the executable. This symbol is the attribute of
 576  * the caching daemon. So, if it exists, nsdispatch won't try to connect to
 577  * the caching daemon and will just ignore the 'cache' source in the
 578  * nsswitch.conf. This method helps to avoid cycles and organize
 579  * self-performing requests.
 580  */
 581 void
 582 _nss_cache_cycle_prevention_function(void)
 583 {
 584 }
 585
 586 int
 587 main(int argc, char *argv[])
 588 {
 589         struct processing_thread_args *thread_args;
 590         pthread_t *threads;
 591
 592         struct pidfh *pidfile;
 593         pid_t pid;
 594
 595         char const *config_file;
 596         char const *error_str;
 597         int error_line;
 598         int i, res;
 599
 600         int trace_mode_enabled;
 601         int force_single_threaded;
 602         int do_not_daemonize;
 603         int clear_user_cache_entries, clear_all_cache_entries;
 604         char *user_config_entry_name, *global_config_entry_name;
 605         int show_statistics;
 606         int daemon_mode, interactive_mode;
 607
 608
 609         /* by default all debug messages are omitted */
 610         TRACE_OFF();
 611
 612         /* parsing command line arguments */
 613         trace_mode_enabled = 0;
 614         force_single_threaded = 0;
 615         do_not_daemonize = 0;
 616         clear_user_cache_entries = 0;
 617         clear_all_cache_entries = 0;
 618         show_statistics = 0;
 619         user_config_entry_name = NULL;
 620         global_config_entry_name = NULL;
 621         while ((res = getopt(argc, argv, "nstdi:I:")) != -1) {
 622                 switch (res) {
 623                 case 'n':
 624                         do_not_daemonize = 1;
 625                         break;
 626                 case 's':
 627                         force_single_threaded = 1;
 628                         break;
 629                 case 't':
 630                         trace_mode_enabled = 1;
 631                         break;
 632                 case 'i':
 633                         clear_user_cache_entries = 1;
 634                         if (optarg != NULL)
 635                                 if (strcmp(optarg, "all") != 0)
 636                                         user_config_entry_name = strdup(optarg);
 637                         break;
 638                 case 'I':
 639                         clear_all_cache_entries = 1;
 640                         if (optarg != NULL)
 641                                 if (strcmp(optarg, "all") != 0)
 642                                         global_config_entry_name =
 643                                                 strdup(optarg);
 644                         break;
 645                 case 'd':
 646                         show_statistics = 1;
 647                         break;
 648                 case '?':
 649                 default:
 650                         usage();
 651                         /* NOT REACHED */
 652                 }
 653         }
 654
 655         daemon_mode = do_not_daemonize | force_single_threaded |
 656                 trace_mode_enabled;
 657         interactive_mode = clear_user_cache_entries | clear_all_cache_entries |
 658                 show_statistics;
 659
 660         if ((daemon_mode != 0) && (interactive_mode != 0)) {
 661                 LOG_ERR_1("main", "daemon mode and interactive_mode arguments "
 662                         "can't be used together");
 663                 usage();
 664         }
 665
 666         if (interactive_mode != 0) {
 667                 FILE *pidfin = fopen(DEFAULT_PIDFILE_PATH, "r");
 668                 char pidbuf[256];
 669
 670                 struct nscd_connection_params connection_params;
 671                 nscd_connection connection;
 672
 673                 int result;
 674
 675                 if (pidfin == NULL)
 676                         errx(EXIT_FAILURE, "There is no daemon running.");
 677
 678                 memset(pidbuf, 0, sizeof(pidbuf));
 679                 fread(pidbuf, sizeof(pidbuf) - 1, 1, pidfin);
 680                 fclose(pidfin);
 681
 682                 if (ferror(pidfin) != 0)
 683                         errx(EXIT_FAILURE, "Can't read from pidfile.");
 684
 685                 if (sscanf(pidbuf, "%d", &pid) != 1)
 686                         errx(EXIT_FAILURE, "Invalid pidfile.");
 687                 LOG_MSG_1("main", "daemon PID is %d", pid);
 688
 689
 690                 memset(&connection_params, 0,
 691                         sizeof(struct nscd_connection_params));
 692                 connection_params.socket_path = DEFAULT_SOCKET_PATH;
 693                 connection = open_nscd_connection__(&connection_params);
 694                 if (connection == INVALID_NSCD_CONNECTION)
 695                         errx(EXIT_FAILURE, "Can't connect to the daemon.");
 696
 697                 if (clear_user_cache_entries != 0) {
 698                         result = nscd_transform__(connection,
 699                                 user_config_entry_name, TT_USER);
 700                         if (result != 0)
 701                                 LOG_MSG_1("main",
 702                                         "user cache transformation failed");
 703                         else
 704                                 LOG_MSG_1("main",
 705                                         "user cache_transformation "
 706                                         "succeeded");
 707                 }
 708
 709                 if (clear_all_cache_entries != 0) {
 710                         if (geteuid() != 0)
 711                                 errx(EXIT_FAILURE, "Only root can initiate "
 712                                         "global cache transformation.");
 713
 714                         result = nscd_transform__(connection,
 715                                 global_config_entry_name, TT_ALL);
 716                         if (result != 0)
 717                                 LOG_MSG_1("main",
 718                                         "global cache transformation "
 719                                         "failed");
 720                         else
 721                                 LOG_MSG_1("main",
 722                                         "global cache transformation "
 723                                         "succeeded");
 724                 }
 725
 726                 close_nscd_connection__(connection);
 727
 728                 free(user_config_entry_name);
 729                 free(global_config_entry_name);
 730                 return (EXIT_SUCCESS);
 731         }
 732
 733         pidfile = pidfile_open(DEFAULT_PIDFILE_PATH, 0644, &pid);
 734         if (pidfile == NULL) {
 735                 if (errno == EEXIST)
 736                         errx(EXIT_FAILURE, "Daemon already running, pid: %d.",
 737                                 pid);
 738                 warn("Cannot open or create pidfile");
 739         }
 740
 741         if (trace_mode_enabled == 1)
 742                 TRACE_ON();
 743
 744         /* blocking the main thread from receiving SIGPIPE signal */
 745         sigblock(sigmask(SIGPIPE));
 746
 747         /* daemonization */
 748         if (do_not_daemonize == 0) {
 749                 res = daemon(0, trace_mode_enabled == 0 ? 0 : 1);
 750                 if (res != 0) {
 751                         LOG_ERR_1("main", "can't daemonize myself: %s",
 752                                 strerror(errno));
 753                         pidfile_remove(pidfile);
 754                         goto fin;
 755                 } else
 756                         LOG_MSG_1("main", "successfully daemonized");
 757         }
 758
 759         pidfile_write(pidfile);
 760
 761         s_agent_table = init_agent_table();
 762         register_agent(s_agent_table, init_passwd_agent());
 763         register_agent(s_agent_table, init_passwd_mp_agent());
 764         register_agent(s_agent_table, init_group_agent());
 765         register_agent(s_agent_table, init_group_mp_agent());
 766         register_agent(s_agent_table, init_services_agent());
 767         register_agent(s_agent_table, init_services_mp_agent());
 768         LOG_MSG_1("main", "request agents registered successfully");
 769
 770         /*
 771          * Hosts agent can't work properly until we have access to the
 772          * appropriate dtab structures, which are used in nsdispatch
 773          * calls
 774          *
 775          register_agent(s_agent_table, init_hosts_agent());
 776         */
 777
 778         /* configuration initialization */
 779         s_configuration = init_configuration();
 780         fill_configuration_defaults(s_configuration);
 781
 782         error_str = NULL;
 783         error_line = 0;
 784         config_file = CONFIG_PATH;
 785
 786         res = parse_config_file(s_configuration, config_file, &error_str,
 787                 &error_line);
 788         if ((res != 0) && (error_str == NULL)) {
 789                 config_file = DEFAULT_CONFIG_PATH;
 790                 res = parse_config_file(s_configuration, config_file,
 791                         &error_str, &error_line);
 792         }
 793
 794         if (res != 0) {
 795                 if (error_str != NULL) {
 796                 LOG_ERR_1("main", "error in configuration file(%s, %d): %s\n",
 797                         config_file, error_line, error_str);
 798                 } else {
 799                 LOG_ERR_1("main", "no configuration file found "
 800                         "- was looking for %s and %s",
 801                         CONFIG_PATH, DEFAULT_CONFIG_PATH);
 802                 }
 803                 destroy_configuration(s_configuration);
 804                 return (-1);
 805         }
 806
 807         if (force_single_threaded == 1)
 808                 s_configuration->threads_num = 1;
 809
 810         /* cache initialization */
 811         s_cache = init_cache_(s_configuration);
 812         if (s_cache == NULL) {
 813                 LOG_ERR_1("main", "can't initialize the cache");
 814                 destroy_configuration(s_configuration);
 815                 return (-1);
 816         }
 817
 818         /* runtime environment initialization */
 819         s_runtime_env = init_runtime_env(s_configuration);
 820         if (s_runtime_env == NULL) {
 821                 LOG_ERR_1("main", "can't initialize the runtime environment");
 822                 destroy_configuration(s_configuration);
 823                 destroy_cache_(s_cache);
 824                 return (-1);
 825         }
 826
 827         if (s_configuration->threads_num > 1) {
 828                 threads = (pthread_t *)calloc(1, sizeof(pthread_t) *
 829                         s_configuration->threads_num);
 830                 for (i = 0; i < s_configuration->threads_num; ++i) {
 831                         thread_args = (struct processing_thread_args *)malloc(
 832                                 sizeof(struct processing_thread_args));
 833                         thread_args->the_cache = s_cache;
 834                         thread_args->the_runtime_env = s_runtime_env;
 835                         thread_args->the_configuration = s_configuration;
 836
 837                         LOG_MSG_1("main", "thread #%d was successfully created",
 838                                 i);
 839                         pthread_create(&threads[i], NULL, processing_thread,
 840                                 thread_args);
 841
 842                         thread_args = NULL;
 843                 }
 844
 845                 for (i = 0; i < s_configuration->threads_num; ++i)
 846                         pthread_join(threads[i], NULL);
 847         } else {
 848                 LOG_MSG_1("main", "working in single-threaded mode");
 849                 processing_loop(s_cache, s_runtime_env, s_configuration);
 850         }
 851
 852 fin:
 853         /* runtime environment destruction */
 854         destroy_runtime_env(s_runtime_env);
 855
 856         /* cache destruction */
 857         destroy_cache_(s_cache);
 858
 859         /* configuration destruction */
 860         destroy_configuration(s_configuration);
 861
 862         /* agents table destruction */
 863         destroy_agent_table(s_agent_table);
 864
 865         pidfile_remove(pidfile);
 866         return (EXIT_SUCCESS);
 867 }