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 #include <sys/param.h>
  30 #include <sys/event.h>
  31 #include <sys/socket.h>
  32 #include <sys/stat.h>
  33 #include <sys/time.h>
  34 #include <sys/un.h>
  35
  36 #include <assert.h>
  37 #include <err.h>
  38 #include <errno.h>
  39 #include <fcntl.h>
  40 #include <libutil.h>
  41 #include <pthread.h>
  42 #include <signal.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47
  48 #include "agents/passwd.h"
  49 #include "agents/group.h"
  50 #include "agents/services.h"
  51 #include "cachelib.h"
  52 #include "config.h"
  53 #include "debug.h"
  54 #include "log.h"
  55 #include "nscdcli.h"
  56 #include "parser.h"
  57 #include "query.h"
  58 #include "singletons.h"
  59
  60 #ifndef CONFIG_PATH
  61 #define CONFIG_PATH "/etc/nscd.conf"
  62 #endif
  63 #define DEFAULT_CONFIG_PATH     "nscd.conf"
  64
  65 #define MAX_SOCKET_IO_SIZE      4096
  66
  67 struct processing_thread_args {
  68         cache   the_cache;
  69         struct configuration    *the_configuration;
  70         struct runtime_env              *the_runtime_env;
  71 };
  72
  73 static void accept_connection(struct kevent *, struct runtime_env *,
  74         struct configuration *);
  75 static void destroy_cache_(cache);
  76 static void destroy_runtime_env(struct runtime_env *);
  77 static cache init_cache_(struct configuration *);
  78 static struct runtime_env *init_runtime_env(struct configuration *);
  79 static void processing_loop(cache, struct runtime_env *,
  80         struct configuration *);
  81 static void process_socket_event(struct kevent *, struct runtime_env *,
  82         struct configuration *);
  83 static void process_timer_event(struct kevent *, struct runtime_env *,
  84         struct configuration *);
  85 static void *processing_thread(void *);
  86 static void usage(void) __dead2;
  87
  88 void get_time_func(struct timeval *);
  89
  90 static void
  91 usage(void)
  92 {
  93         fprintf(stderr,
  94             "usage: nscd [-dnst] [-i cachename] [-I cachename]\n");
  95         exit(1);
  96 }
  97
  98 static cache
  99 init_cache_(struct configuration *config)
 100 {
 101         struct cache_params params;
 102         cache retval;
 103
 104         struct configuration_entry *config_entry;
 105         size_t  size, i;
 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                 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.cep.entry_name);
 124                 assert(config_entry->positive_cache_entry !=
 125                         INVALID_CACHE_ENTRY);
 126
 127                 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.cep.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 = calloc(1, sizeof(*retval));
 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 <= (size_t)event_data->data)) ||
 317                 ((qstate->use_alternate_io != 0) &&
 318                 (qstate->io_buffer_watermark <= (size_t)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 0
 406                         /*
 407                          * XXX: Uncommenting this code makes nscd(8) fail for
 408                          *      entries larger than a few kB, causing few second
 409                          *      worth of delay for each call to retrieve them.
 410                          */
 411                         if (qstate->io_buffer != NULL)
 412                                 free(qstate->io_buffer);
 413
 414                         qstate->io_buffer = calloc(1,
 415                                 qstate->kevent_watermark);
 416                         assert(qstate->io_buffer != NULL);
 417
 418                         qstate->io_buffer_p = qstate->io_buffer;
 419                         qstate->io_buffer_size = qstate->kevent_watermark;
 420                         qstate->io_buffer_filter = qstate->kevent_filter;
 421
 422                         qstate->write_func = query_io_buffer_write;
 423                         qstate->read_func = query_io_buffer_read;
 424
 425                         if (qstate->kevent_filter == EVFILT_READ)
 426                                 qstate->use_alternate_io = 1;
 427 #endif
 428
 429                         qstate->io_buffer_watermark = MAX_SOCKET_IO_SIZE;
 430                         EV_SET(&eventlist[1], event_data->ident,
 431                                 qstate->kevent_filter, EV_ADD | EV_ONESHOT,
 432                                 NOTE_LOWAT, MAX_SOCKET_IO_SIZE, qstate);
 433                 } else {
 434                         EV_SET(&eventlist[1], event_data->ident,
 435                                 qstate->kevent_filter, EV_ADD | EV_ONESHOT,
 436                                 NOTE_LOWAT, qstate->kevent_watermark, qstate);
 437                 }
 438         } else {
 439                 if (qstate->io_buffer + qstate->io_buffer_size -
 440                         qstate->io_buffer_p <
 441                         MAX_SOCKET_IO_SIZE) {
 442                         qstate->io_buffer_watermark = qstate->io_buffer +
 443                                 qstate->io_buffer_size - qstate->io_buffer_p;
 444                         EV_SET(&eventlist[1], event_data->ident,
 445                                 qstate->io_buffer_filter,
 446                                 EV_ADD | EV_ONESHOT, NOTE_LOWAT,
 447                                 qstate->io_buffer_watermark,
 448                                 qstate);
 449                 } else {
 450                         qstate->io_buffer_watermark = MAX_SOCKET_IO_SIZE;
 451                         EV_SET(&eventlist[1], event_data->ident,
 452                                 qstate->io_buffer_filter, EV_ADD | EV_ONESHOT,
 453                                 NOTE_LOWAT, MAX_SOCKET_IO_SIZE, qstate);
 454                 }
 455         }
 456         EV_SET(&eventlist[0], event_data->ident, EVFILT_TIMER,
 457                 EV_ADD | EV_ONESHOT, 0, query_timeout.tv_sec * 1000, qstate);
 458         kevent(env->queue, eventlist, 2, NULL, 0, &kevent_timeout);
 459
 460         TRACE_OUT(process_socket_event);
 461 }
 462
 463 /*
 464  * This routine is called if timer event has been signaled in the kqueue. It
 465  * just closes the socket and destroys the query_state.
 466  */
 467 static void
 468 process_timer_event(struct kevent *event_data, struct runtime_env *env,
 469         struct configuration *config)
 470 {
 471         struct query_state      *qstate;
 472
 473         TRACE_IN(process_timer_event);
 474         qstate = (struct query_state *)event_data->udata;
 475         destroy_query_state(qstate);
 476         close(event_data->ident);
 477         TRACE_OUT(process_timer_event);
 478 }
 479
 480 /*
 481  * Processing loop is the basic processing routine, that forms a body of each
 482  * procssing thread
 483  */
 484 static void
 485 processing_loop(cache the_cache, struct runtime_env *env,
 486         struct configuration *config)
 487 {
 488         struct timespec timeout;
 489         const int eventlist_size = 1;
 490         struct kevent eventlist[eventlist_size];
 491         int nevents, i;
 492
 493         TRACE_MSG("=> processing_loop");
 494         memset(&timeout, 0, sizeof(struct timespec));
 495         memset(&eventlist, 0, sizeof(struct kevent) * eventlist_size);
 496
 497         for (;;) {
 498                 nevents = kevent(env->queue, NULL, 0, eventlist,
 499                         eventlist_size, NULL);
 500                 /*
 501                  * we can only receive 1 event on success
 502                  */
 503                 if (nevents == 1) {
 504                         struct kevent *event_data;
 505                         event_data = &eventlist[0];
 506
 507                         if ((int)event_data->ident == env->sockfd) {
 508                                 for (i = 0; i < event_data->data; ++i)
 509                                     accept_connection(event_data, env, config);
 510
 511                                 EV_SET(eventlist, s_runtime_env->sockfd,
 512                                     EVFILT_READ, EV_ADD | EV_ONESHOT,
 513                                     0, 0, 0);
 514                                 memset(&timeout, 0,
 515                                     sizeof(struct timespec));
 516                                 kevent(s_runtime_env->queue, eventlist,
 517                                     1, NULL, 0, &timeout);
 518
 519                         } else {
 520                                 switch (event_data->filter) {
 521                                 case EVFILT_READ:
 522                                 case EVFILT_WRITE:
 523                                         process_socket_event(event_data,
 524                                                 env, config);
 525                                         break;
 526                                 case EVFILT_TIMER:
 527                                         process_timer_event(event_data,
 528                                                 env, config);
 529                                         break;
 530                                 default:
 531                                         break;
 532                                 }
 533                         }
 534                 } else {
 535                         /* this branch shouldn't be currently executed */
 536                 }
 537         }
 538
 539         TRACE_MSG("<= processing_loop");
 540 }
 541
 542 /*
 543  * Wrapper above the processing loop function. It sets the thread signal mask
 544  * to avoid SIGPIPE signals (which can happen if the client works incorrectly).
 545  */
 546 static void *
 547 processing_thread(void *data)
 548 {
 549         struct processing_thread_args   *args;
 550         sigset_t new;
 551
 552         TRACE_MSG("=> processing_thread");
 553         args = (struct processing_thread_args *)data;
 554
 555         sigemptyset(&new);
 556         sigaddset(&new, SIGPIPE);
 557         if (pthread_sigmask(SIG_BLOCK, &new, NULL) != 0)
 558                 LOG_ERR_1("processing thread",
 559                         "thread can't block the SIGPIPE signal");
 560
 561         processing_loop(args->the_cache, args->the_runtime_env,
 562                 args->the_configuration);
 563         free(args);
 564         TRACE_MSG("<= processing_thread");
 565
 566         return (NULL);
 567 }
 568
 569 void
 570 get_time_func(struct timeval *time)
 571 {
 572         struct timespec res;
 573         memset(&res, 0, sizeof(struct timespec));
 574         clock_gettime(CLOCK_MONOTONIC, &res);
 575
 576         time->tv_sec = res.tv_sec;
 577         time->tv_usec = 0;
 578 }
 579
 580 /*
 581  * The idea of _nss_cache_cycle_prevention_function is that nsdispatch
 582  * will search for this symbol in the executable. This symbol is the
 583  * attribute of the caching daemon. So, if it exists, nsdispatch won't try
 584  * to connect to the caching daemon and will just ignore the 'cache'
 585  * source in the nsswitch.conf. This method helps to avoid cycles and
 586  * organize self-performing requests.
 587  *
 588  * (not actually a function; it used to be, but it doesn't make any
 589  * difference, as long as it has external linkage)
 590  */
 591 void *_nss_cache_cycle_prevention_function;
 592
 593 int
 594 main(int argc, char *argv[])
 595 {
 596         struct processing_thread_args *thread_args;
 597         pthread_t *threads;
 598
 599         struct pidfh *pidfile;
 600         pid_t pid;
 601
 602         char const *config_file;
 603         char const *error_str;
 604         int error_line;
 605         int i, res;
 606
 607         int trace_mode_enabled;
 608         int force_single_threaded;
 609         int do_not_daemonize;
 610         int clear_user_cache_entries, clear_all_cache_entries;
 611         char *user_config_entry_name, *global_config_entry_name;
 612         int show_statistics;
 613         int daemon_mode, interactive_mode;
 614
 615
 616         /* by default all debug messages are omitted */
 617         TRACE_OFF();
 618
 619         /* parsing command line arguments */
 620         trace_mode_enabled = 0;
 621         force_single_threaded = 0;
 622         do_not_daemonize = 0;
 623         clear_user_cache_entries = 0;
 624         clear_all_cache_entries = 0;
 625         show_statistics = 0;
 626         user_config_entry_name = NULL;
 627         global_config_entry_name = NULL;
 628         while ((res = getopt(argc, argv, "nstdi:I:")) != -1) {
 629                 switch (res) {
 630                 case 'n':
 631                         do_not_daemonize = 1;
 632                         break;
 633                 case 's':
 634                         force_single_threaded = 1;
 635                         break;
 636                 case 't':
 637                         trace_mode_enabled = 1;
 638                         break;
 639                 case 'i':
 640                         clear_user_cache_entries = 1;
 641                         if (optarg != NULL)
 642                                 if (strcmp(optarg, "all") != 0)
 643                                         user_config_entry_name = strdup(optarg);
 644                         break;
 645                 case 'I':
 646                         clear_all_cache_entries = 1;
 647                         if (optarg != NULL)
 648                                 if (strcmp(optarg, "all") != 0)
 649                                         global_config_entry_name =
 650                                                 strdup(optarg);
 651                         break;
 652                 case 'd':
 653                         show_statistics = 1;
 654                         break;
 655                 case '?':
 656                 default:
 657                         usage();
 658                         /* NOT REACHED */
 659                 }
 660         }
 661
 662         daemon_mode = do_not_daemonize | force_single_threaded |
 663                 trace_mode_enabled;
 664         interactive_mode = clear_user_cache_entries | clear_all_cache_entries |
 665                 show_statistics;
 666
 667         if ((daemon_mode != 0) && (interactive_mode != 0)) {
 668                 LOG_ERR_1("main", "daemon mode and interactive_mode arguments "
 669                         "can't be used together");
 670                 usage();
 671         }
 672
 673         if (interactive_mode != 0) {
 674                 FILE *pidfin = fopen(DEFAULT_PIDFILE_PATH, "r");
 675                 char pidbuf[256];
 676
 677                 struct nscd_connection_params connection_params;
 678                 nscd_connection connection;
 679
 680                 int result;
 681
 682                 if (pidfin == NULL)
 683                         errx(EXIT_FAILURE, "There is no daemon running.");
 684
 685                 memset(pidbuf, 0, sizeof(pidbuf));
 686                 fread(pidbuf, sizeof(pidbuf) - 1, 1, pidfin);
 687                 fclose(pidfin);
 688
 689                 if (ferror(pidfin) != 0)
 690                         errx(EXIT_FAILURE, "Can't read from pidfile.");
 691
 692                 if (sscanf(pidbuf, "%d", &pid) != 1)
 693                         errx(EXIT_FAILURE, "Invalid pidfile.");
 694                 LOG_MSG_1("main", "daemon PID is %d", pid);
 695
 696
 697                 memset(&connection_params, 0,
 698                         sizeof(struct nscd_connection_params));
 699                 connection_params.socket_path = DEFAULT_SOCKET_PATH;
 700                 connection = open_nscd_connection__(&connection_params);
 701                 if (connection == INVALID_NSCD_CONNECTION)
 702                         errx(EXIT_FAILURE, "Can't connect to the daemon.");
 703
 704                 if (clear_user_cache_entries != 0) {
 705                         result = nscd_transform__(connection,
 706                                 user_config_entry_name, TT_USER);
 707                         if (result != 0)
 708                                 LOG_MSG_1("main",
 709                                         "user cache transformation failed");
 710                         else
 711                                 LOG_MSG_1("main",
 712                                         "user cache_transformation "
 713                                         "succeeded");
 714                 }
 715
 716                 if (clear_all_cache_entries != 0) {
 717                         if (geteuid() != 0)
 718                                 errx(EXIT_FAILURE, "Only root can initiate "
 719                                         "global cache transformation.");
 720
 721                         result = nscd_transform__(connection,
 722                                 global_config_entry_name, TT_ALL);
 723                         if (result != 0)
 724                                 LOG_MSG_1("main",
 725                                         "global cache transformation "
 726                                         "failed");
 727                         else
 728                                 LOG_MSG_1("main",
 729                                         "global cache transformation "
 730                                         "succeeded");
 731                 }
 732
 733                 close_nscd_connection__(connection);
 734
 735                 free(user_config_entry_name);
 736                 free(global_config_entry_name);
 737                 return (EXIT_SUCCESS);
 738         }
 739
 740         pidfile = pidfile_open(DEFAULT_PIDFILE_PATH, 0644, &pid);
 741         if (pidfile == NULL) {
 742                 if (errno == EEXIST)
 743                         errx(EXIT_FAILURE, "Daemon already running, pid: %d.",
 744                                 pid);
 745                 warn("Cannot open or create pidfile");
 746         }
 747
 748         if (trace_mode_enabled == 1)
 749                 TRACE_ON();
 750
 751         /* blocking the main thread from receiving SIGPIPE signal */
 752         sigblock(sigmask(SIGPIPE));
 753
 754         /* daemonization */
 755         if (do_not_daemonize == 0) {
 756                 res = daemon(0, trace_mode_enabled == 0 ? 0 : 1);
 757                 if (res != 0) {
 758                         LOG_ERR_1("main", "can't daemonize myself: %s",
 759                                 strerror(errno));
 760                         pidfile_remove(pidfile);
 761                         goto fin;
 762                 } else
 763                         LOG_MSG_1("main", "successfully daemonized");
 764         }
 765
 766         pidfile_write(pidfile);
 767
 768         s_agent_table = init_agent_table();
 769         register_agent(s_agent_table, init_passwd_agent());
 770         register_agent(s_agent_table, init_passwd_mp_agent());
 771         register_agent(s_agent_table, init_group_agent());
 772         register_agent(s_agent_table, init_group_mp_agent());
 773         register_agent(s_agent_table, init_services_agent());
 774         register_agent(s_agent_table, init_services_mp_agent());
 775         LOG_MSG_1("main", "request agents registered successfully");
 776
 777         /*
 778          * Hosts agent can't work properly until we have access to the
 779          * appropriate dtab structures, which are used in nsdispatch
 780          * calls
 781          *
 782          register_agent(s_agent_table, init_hosts_agent());
 783         */
 784
 785         /* configuration initialization */
 786         s_configuration = init_configuration();
 787         fill_configuration_defaults(s_configuration);
 788
 789         error_str = NULL;
 790         error_line = 0;
 791         config_file = CONFIG_PATH;
 792
 793         res = parse_config_file(s_configuration, config_file, &error_str,
 794                 &error_line);
 795         if ((res != 0) && (error_str == NULL)) {
 796                 config_file = DEFAULT_CONFIG_PATH;
 797                 res = parse_config_file(s_configuration, config_file,
 798                         &error_str, &error_line);
 799         }
 800
 801         if (res != 0) {
 802                 if (error_str != NULL) {
 803                 LOG_ERR_1("main", "error in configuration file(%s, %d): %s\n",
 804                         config_file, error_line, error_str);
 805                 } else {
 806                 LOG_ERR_1("main", "no configuration file found "
 807                         "- was looking for %s and %s",
 808                         CONFIG_PATH, DEFAULT_CONFIG_PATH);
 809                 }
 810                 destroy_configuration(s_configuration);
 811                 return (-1);
 812         }
 813
 814         if (force_single_threaded == 1)
 815                 s_configuration->threads_num = 1;
 816
 817         /* cache initialization */
 818         s_cache = init_cache_(s_configuration);
 819         if (s_cache == NULL) {
 820                 LOG_ERR_1("main", "can't initialize the cache");
 821                 destroy_configuration(s_configuration);
 822                 return (-1);
 823         }
 824
 825         /* runtime environment initialization */
 826         s_runtime_env = init_runtime_env(s_configuration);
 827         if (s_runtime_env == NULL) {
 828                 LOG_ERR_1("main", "can't initialize the runtime environment");
 829                 destroy_configuration(s_configuration);
 830                 destroy_cache_(s_cache);
 831                 return (-1);
 832         }
 833
 834         if (s_configuration->threads_num > 1) {
 835                 threads = calloc(s_configuration->threads_num,
 836                         sizeof(*threads));
 837                 for (i = 0; i < s_configuration->threads_num; ++i) {
 838                         thread_args = malloc(
 839                                 sizeof(*thread_args));
 840                         thread_args->the_cache = s_cache;
 841                         thread_args->the_runtime_env = s_runtime_env;
 842                         thread_args->the_configuration = s_configuration;
 843
 844                         LOG_MSG_1("main", "thread #%d was successfully created",
 845                                 i);
 846                         pthread_create(&threads[i], NULL, processing_thread,
 847                                 thread_args);
 848
 849                         thread_args = NULL;
 850                 }
 851
 852                 for (i = 0; i < s_configuration->threads_num; ++i)
 853                         pthread_join(threads[i], NULL);
 854         } else {
 855                 LOG_MSG_1("main", "working in single-threaded mode");
 856                 processing_loop(s_cache, s_runtime_env, s_configuration);
 857         }
 858
 859 fin:
 860         /* runtime environment destruction */
 861         destroy_runtime_env(s_runtime_env);
 862
 863         /* cache destruction */
 864         destroy_cache_(s_cache);
 865
 866         /* configuration destruction */
 867         destroy_configuration(s_configuration);
 868
 869         /* agents table destruction */
 870         destroy_agent_table(s_agent_table);
 871
 872         pidfile_remove(pidfile);
 873         return (EXIT_SUCCESS);
 874 }