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
 109         TRACE_IN(init_cache_);
 110
 111         memset(&params, 0, sizeof(struct cache_params));
 112         params.get_time_func = get_time_func;
 113         retval = init_cache(&params);
 114
 115         size = configuration_get_entries_size(config);
 116         for (i = 0; i < size; ++i) {
 117                 config_entry = configuration_get_entry(config, i);
 118                 /*
 119                  * We should register common entries now - multipart entries
 120                  * would be registered automatically during the queries.
 121                  */
 122                 register_cache_entry(retval, (struct cache_entry_params *)
 123                         &config_entry->positive_cache_params);
 124                 config_entry->positive_cache_entry = find_cache_entry(retval,
 125                         config_entry->positive_cache_params.cep.entry_name);
 126                 assert(config_entry->positive_cache_entry !=
 127                         INVALID_CACHE_ENTRY);
 128
 129                 register_cache_entry(retval, (struct cache_entry_params *)
 130                         &config_entry->negative_cache_params);
 131                 config_entry->negative_cache_entry = find_cache_entry(retval,
 132                         config_entry->negative_cache_params.cep.entry_name);
 133                 assert(config_entry->negative_cache_entry !=
 134                         INVALID_CACHE_ENTRY);
 135         }
 136
 137         LOG_MSG_2("cache", "cache was successfully initialized");
 138         TRACE_OUT(init_cache_);
 139         return (retval);
 140 }
 141
 142 static void
 143 destroy_cache_(cache the_cache)
 144 {
 145         TRACE_IN(destroy_cache_);
 146         destroy_cache(the_cache);
 147         TRACE_OUT(destroy_cache_);
 148 }
 149
 150 /*
 151  * Socket and kqueues are prepared here. We have one global queue for both
 152  * socket and timers events.
 153  */
 154 static struct runtime_env *
 155 init_runtime_env(struct configuration *config)
 156 {
 157         int serv_addr_len;
 158         struct sockaddr_un serv_addr;
 159
 160         struct kevent eventlist;
 161         struct timespec timeout;
 162
 163         struct runtime_env *retval;
 164
 165         TRACE_IN(init_runtime_env);
 166         retval = calloc(1, sizeof(*retval));
 167         assert(retval != NULL);
 168
 169         retval->sockfd = socket(PF_LOCAL, SOCK_STREAM, 0);
 170
 171         if (config->force_unlink == 1)
 172                 unlink(config->socket_path);
 173
 174         memset(&serv_addr, 0, sizeof(struct sockaddr_un));
 175         serv_addr.sun_family = PF_LOCAL;
 176         strlcpy(serv_addr.sun_path, config->socket_path,
 177                 sizeof(serv_addr.sun_path));
 178         serv_addr_len = sizeof(serv_addr.sun_family) +
 179                 strlen(serv_addr.sun_path) + 1;
 180
 181         if (bind(retval->sockfd, (struct sockaddr *)&serv_addr,
 182                 serv_addr_len) == -1) {
 183                 close(retval->sockfd);
 184                 free(retval);
 185
 186                 LOG_ERR_2("runtime environment", "can't bind socket to path: "
 187                         "%s", config->socket_path);
 188                 TRACE_OUT(init_runtime_env);
 189                 return (NULL);
 190         }
 191         LOG_MSG_2("runtime environment", "using socket %s",
 192                 config->socket_path);
 193
 194         /*
 195          * Here we're marking socket as non-blocking and setting its backlog
 196          * to the maximum value
 197          */
 198         chmod(config->socket_path, config->socket_mode);
 199         listen(retval->sockfd, -1);
 200         fcntl(retval->sockfd, F_SETFL, O_NONBLOCK);
 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 0
 408                         /*
 409                          * XXX: Uncommenting this code makes nscd(8) fail for
 410                          *      entries larger than a few kB, causing few second
 411                          *      worth of delay for each call to retrieve them.
 412                          */
 413                         if (qstate->io_buffer != NULL)
 414                                 free(qstate->io_buffer);
 415
 416                         qstate->io_buffer = calloc(1,
 417                                 qstate->kevent_watermark);
 418                         assert(qstate->io_buffer != NULL);
 419
 420                         qstate->io_buffer_p = qstate->io_buffer;
 421                         qstate->io_buffer_size = qstate->kevent_watermark;
 422                         qstate->io_buffer_filter = qstate->kevent_filter;
 423
 424                         qstate->write_func = query_io_buffer_write;
 425                         qstate->read_func = query_io_buffer_read;
 426
 427                         if (qstate->kevent_filter == EVFILT_READ)
 428                                 qstate->use_alternate_io = 1;
 429 #endif
 430
 431                         qstate->io_buffer_watermark = MAX_SOCKET_IO_SIZE;
 432                         EV_SET(&eventlist[1], event_data->ident,
 433                                 qstate->kevent_filter, EV_ADD | EV_ONESHOT,
 434                                 NOTE_LOWAT, MAX_SOCKET_IO_SIZE, qstate);
 435                 } else {
 436                         EV_SET(&eventlist[1], event_data->ident,
 437                                 qstate->kevent_filter, EV_ADD | EV_ONESHOT,
 438                                 NOTE_LOWAT, qstate->kevent_watermark, qstate);
 439                 }
 440         } else {
 441                 if (qstate->io_buffer + qstate->io_buffer_size -
 442                         qstate->io_buffer_p <
 443                         MAX_SOCKET_IO_SIZE) {
 444                         qstate->io_buffer_watermark = qstate->io_buffer +
 445                                 qstate->io_buffer_size - qstate->io_buffer_p;
 446                         EV_SET(&eventlist[1], event_data->ident,
 447                                 qstate->io_buffer_filter,
 448                                 EV_ADD | EV_ONESHOT, NOTE_LOWAT,
 449                                 qstate->io_buffer_watermark,
 450                                 qstate);
 451                 } else {
 452                         qstate->io_buffer_watermark = MAX_SOCKET_IO_SIZE;
 453                         EV_SET(&eventlist[1], event_data->ident,
 454                                 qstate->io_buffer_filter, EV_ADD | EV_ONESHOT,
 455                                 NOTE_LOWAT, MAX_SOCKET_IO_SIZE, qstate);
 456                 }
 457         }
 458         EV_SET(&eventlist[0], event_data->ident, EVFILT_TIMER,
 459                 EV_ADD | EV_ONESHOT, 0, query_timeout.tv_sec * 1000, qstate);
 460         kevent(env->queue, eventlist, 2, NULL, 0, &kevent_timeout);
 461
 462         TRACE_OUT(process_socket_event);
 463 }
 464
 465 /*
 466  * This routine is called if timer event has been signaled in the kqueue. It
 467  * just closes the socket and destroys the query_state.
 468  */
 469 static void
 470 process_timer_event(struct kevent *event_data, struct runtime_env *env,
 471         struct configuration *config)
 472 {
 473         struct query_state      *qstate;
 474
 475         TRACE_IN(process_timer_event);
 476         qstate = (struct query_state *)event_data->udata;
 477         destroy_query_state(qstate);
 478         close(event_data->ident);
 479         TRACE_OUT(process_timer_event);
 480 }
 481
 482 /*
 483  * Processing loop is the basic processing routine, that forms a body of each
 484  * procssing thread
 485  */
 486 static void
 487 processing_loop(cache the_cache, struct runtime_env *env,
 488         struct configuration *config)
 489 {
 490         struct timespec timeout;
 491         const int eventlist_size = 1;
 492         struct kevent eventlist[eventlist_size];
 493         int nevents, i;
 494
 495         TRACE_MSG("=> processing_loop");
 496         memset(&timeout, 0, sizeof(struct timespec));
 497         memset(&eventlist, 0, sizeof(struct kevent) * eventlist_size);
 498
 499         for (;;) {
 500                 nevents = kevent(env->queue, NULL, 0, eventlist,
 501                         eventlist_size, NULL);
 502                 /*
 503                  * we can only receive 1 event on success
 504                  */
 505                 if (nevents == 1) {
 506                         struct kevent *event_data;
 507                         event_data = &eventlist[0];
 508
 509                         if ((int)event_data->ident == env->sockfd) {
 510                                 for (i = 0; i < event_data->data; ++i)
 511                                     accept_connection(event_data, env, config);
 512
 513                                 EV_SET(eventlist, s_runtime_env->sockfd,
 514                                     EVFILT_READ, EV_ADD | EV_ONESHOT,
 515                                     0, 0, 0);
 516                                 memset(&timeout, 0,
 517                                     sizeof(struct timespec));
 518                                 kevent(s_runtime_env->queue, eventlist,
 519                                     1, NULL, 0, &timeout);
 520
 521                         } else {
 522                                 switch (event_data->filter) {
 523                                 case EVFILT_READ:
 524                                 case EVFILT_WRITE:
 525                                         process_socket_event(event_data,
 526                                                 env, config);
 527                                         break;
 528                                 case EVFILT_TIMER:
 529                                         process_timer_event(event_data,
 530                                                 env, config);
 531                                         break;
 532                                 default:
 533                                         break;
 534                                 }
 535                         }
 536                 } else {
 537                         /* this branch shouldn't be currently executed */
 538                 }
 539         }
 540
 541         TRACE_MSG("<= processing_loop");
 542 }
 543
 544 /*
 545  * Wrapper above the processing loop function. It sets the thread signal mask
 546  * to avoid SIGPIPE signals (which can happen if the client works incorrectly).
 547  */
 548 static void *
 549 processing_thread(void *data)
 550 {
 551         struct processing_thread_args   *args;
 552         sigset_t new;
 553
 554         TRACE_MSG("=> processing_thread");
 555         args = (struct processing_thread_args *)data;
 556
 557         sigemptyset(&new);
 558         sigaddset(&new, SIGPIPE);
 559         if (pthread_sigmask(SIG_BLOCK, &new, NULL) != 0)
 560                 LOG_ERR_1("processing thread",
 561                         "thread can't block the SIGPIPE signal");
 562
 563         processing_loop(args->the_cache, args->the_runtime_env,
 564                 args->the_configuration);
 565         free(args);
 566         TRACE_MSG("<= processing_thread");
 567
 568         return (NULL);
 569 }
 570
 571 void
 572 get_time_func(struct timeval *time)
 573 {
 574         struct timespec res;
 575         memset(&res, 0, sizeof(struct timespec));
 576         clock_gettime(CLOCK_MONOTONIC, &res);
 577
 578         time->tv_sec = res.tv_sec;
 579         time->tv_usec = 0;
 580 }
 581
 582 /*
 583  * The idea of _nss_cache_cycle_prevention_function is that nsdispatch
 584  * will search for this symbol in the executable. This symbol is the
 585  * attribute of the caching daemon. So, if it exists, nsdispatch won't try
 586  * to connect to the caching daemon and will just ignore the 'cache'
 587  * source in the nsswitch.conf. This method helps to avoid cycles and
 588  * organize self-performing requests.
 589  *
 590  * (not actually a function; it used to be, but it doesn't make any
 591  * difference, as long as it has external linkage)
 592  */
 593 void *_nss_cache_cycle_prevention_function;
 594
 595 int
 596 main(int argc, char *argv[])
 597 {
 598         struct processing_thread_args *thread_args;
 599         pthread_t *threads;
 600
 601         struct pidfh *pidfile;
 602         pid_t pid;
 603
 604         char const *config_file;
 605         char const *error_str;
 606         int error_line;
 607         int i, res;
 608
 609         int trace_mode_enabled;
 610         int force_single_threaded;
 611         int do_not_daemonize;
 612         int clear_user_cache_entries, clear_all_cache_entries;
 613         char *user_config_entry_name, *global_config_entry_name;
 614         int show_statistics;
 615         int daemon_mode, interactive_mode;
 616
 617
 618         /* by default all debug messages are omitted */
 619         TRACE_OFF();
 620
 621         /* parsing command line arguments */
 622         trace_mode_enabled = 0;
 623         force_single_threaded = 0;
 624         do_not_daemonize = 0;
 625         clear_user_cache_entries = 0;
 626         clear_all_cache_entries = 0;
 627         show_statistics = 0;
 628         user_config_entry_name = NULL;
 629         global_config_entry_name = NULL;
 630         while ((res = getopt(argc, argv, "nstdi:I:")) != -1) {
 631                 switch (res) {
 632                 case 'n':
 633                         do_not_daemonize = 1;
 634                         break;
 635                 case 's':
 636                         force_single_threaded = 1;
 637                         break;
 638                 case 't':
 639                         trace_mode_enabled = 1;
 640                         break;
 641                 case 'i':
 642                         clear_user_cache_entries = 1;
 643                         if (optarg != NULL)
 644                                 if (strcmp(optarg, "all") != 0)
 645                                         user_config_entry_name = strdup(optarg);
 646                         break;
 647                 case 'I':
 648                         clear_all_cache_entries = 1;
 649                         if (optarg != NULL)
 650                                 if (strcmp(optarg, "all") != 0)
 651                                         global_config_entry_name =
 652                                                 strdup(optarg);
 653                         break;
 654                 case 'd':
 655                         show_statistics = 1;
 656                         break;
 657                 case '?':
 658                 default:
 659                         usage();
 660                         /* NOT REACHED */
 661                 }
 662         }
 663
 664         daemon_mode = do_not_daemonize | force_single_threaded |
 665                 trace_mode_enabled;
 666         interactive_mode = clear_user_cache_entries | clear_all_cache_entries |
 667                 show_statistics;
 668
 669         if ((daemon_mode != 0) && (interactive_mode != 0)) {
 670                 LOG_ERR_1("main", "daemon mode and interactive_mode arguments "
 671                         "can't be used together");
 672                 usage();
 673         }
 674
 675         if (interactive_mode != 0) {
 676                 FILE *pidfin = fopen(DEFAULT_PIDFILE_PATH, "r");
 677                 char pidbuf[256];
 678
 679                 struct nscd_connection_params connection_params;
 680                 nscd_connection connection;
 681
 682                 int result;
 683
 684                 if (pidfin == NULL)
 685                         errx(EXIT_FAILURE, "There is no daemon running.");
 686
 687                 memset(pidbuf, 0, sizeof(pidbuf));
 688                 fread(pidbuf, sizeof(pidbuf) - 1, 1, pidfin);
 689                 fclose(pidfin);
 690
 691                 if (ferror(pidfin) != 0)
 692                         errx(EXIT_FAILURE, "Can't read from pidfile.");
 693
 694                 if (sscanf(pidbuf, "%d", &pid) != 1)
 695                         errx(EXIT_FAILURE, "Invalid pidfile.");
 696                 LOG_MSG_1("main", "daemon PID is %d", pid);
 697
 698
 699                 memset(&connection_params, 0,
 700                         sizeof(struct nscd_connection_params));
 701                 connection_params.socket_path = DEFAULT_SOCKET_PATH;
 702                 connection = open_nscd_connection__(&connection_params);
 703                 if (connection == INVALID_NSCD_CONNECTION)
 704                         errx(EXIT_FAILURE, "Can't connect to the daemon.");
 705
 706                 if (clear_user_cache_entries != 0) {
 707                         result = nscd_transform__(connection,
 708                                 user_config_entry_name, TT_USER);
 709                         if (result != 0)
 710                                 LOG_MSG_1("main",
 711                                         "user cache transformation failed");
 712                         else
 713                                 LOG_MSG_1("main",
 714                                         "user cache_transformation "
 715                                         "succeeded");
 716                 }
 717
 718                 if (clear_all_cache_entries != 0) {
 719                         if (geteuid() != 0)
 720                                 errx(EXIT_FAILURE, "Only root can initiate "
 721                                         "global cache transformation.");
 722
 723                         result = nscd_transform__(connection,
 724                                 global_config_entry_name, TT_ALL);
 725                         if (result != 0)
 726                                 LOG_MSG_1("main",
 727                                         "global cache transformation "
 728                                         "failed");
 729                         else
 730                                 LOG_MSG_1("main",
 731                                         "global cache transformation "
 732                                         "succeeded");
 733                 }
 734
 735                 close_nscd_connection__(connection);
 736
 737                 free(user_config_entry_name);
 738                 free(global_config_entry_name);
 739                 return (EXIT_SUCCESS);
 740         }
 741
 742         pidfile = pidfile_open(DEFAULT_PIDFILE_PATH, 0644, &pid);
 743         if (pidfile == NULL) {
 744                 if (errno == EEXIST)
 745                         errx(EXIT_FAILURE, "Daemon already running, pid: %d.",
 746                                 pid);
 747                 warn("Cannot open or create pidfile");
 748         }
 749
 750         if (trace_mode_enabled == 1)
 751                 TRACE_ON();
 752
 753         /* blocking the main thread from receiving SIGPIPE signal */
 754         sigblock(sigmask(SIGPIPE));
 755
 756         /* daemonization */
 757         if (do_not_daemonize == 0) {
 758                 res = daemon(0, trace_mode_enabled == 0 ? 0 : 1);
 759                 if (res != 0) {
 760                         LOG_ERR_1("main", "can't daemonize myself: %s",
 761                                 strerror(errno));
 762                         pidfile_remove(pidfile);
 763                         goto fin;
 764                 } else
 765                         LOG_MSG_1("main", "successfully daemonized");
 766         }
 767
 768         pidfile_write(pidfile);
 769
 770         s_agent_table = init_agent_table();
 771         register_agent(s_agent_table, init_passwd_agent());
 772         register_agent(s_agent_table, init_passwd_mp_agent());
 773         register_agent(s_agent_table, init_group_agent());
 774         register_agent(s_agent_table, init_group_mp_agent());
 775         register_agent(s_agent_table, init_services_agent());
 776         register_agent(s_agent_table, init_services_mp_agent());
 777         LOG_MSG_1("main", "request agents registered successfully");
 778
 779         /*
 780          * Hosts agent can't work properly until we have access to the
 781          * appropriate dtab structures, which are used in nsdispatch
 782          * calls
 783          *
 784          register_agent(s_agent_table, init_hosts_agent());
 785         */
 786
 787         /* configuration initialization */
 788         s_configuration = init_configuration();
 789         fill_configuration_defaults(s_configuration);
 790
 791         error_str = NULL;
 792         error_line = 0;
 793         config_file = CONFIG_PATH;
 794
 795         res = parse_config_file(s_configuration, config_file, &error_str,
 796                 &error_line);
 797         if ((res != 0) && (error_str == NULL)) {
 798                 config_file = DEFAULT_CONFIG_PATH;
 799                 res = parse_config_file(s_configuration, config_file,
 800                         &error_str, &error_line);
 801         }
 802
 803         if (res != 0) {
 804                 if (error_str != NULL) {
 805                 LOG_ERR_1("main", "error in configuration file(%s, %d): %s\n",
 806                         config_file, error_line, error_str);
 807                 } else {
 808                 LOG_ERR_1("main", "no configuration file found "
 809                         "- was looking for %s and %s",
 810                         CONFIG_PATH, DEFAULT_CONFIG_PATH);
 811                 }
 812                 destroy_configuration(s_configuration);
 813                 return (-1);
 814         }
 815
 816         if (force_single_threaded == 1)
 817                 s_configuration->threads_num = 1;
 818
 819         /* cache initialization */
 820         s_cache = init_cache_(s_configuration);
 821         if (s_cache == NULL) {
 822                 LOG_ERR_1("main", "can't initialize the cache");
 823                 destroy_configuration(s_configuration);
 824                 return (-1);
 825         }
 826
 827         /* runtime environment initialization */
 828         s_runtime_env = init_runtime_env(s_configuration);
 829         if (s_runtime_env == NULL) {
 830                 LOG_ERR_1("main", "can't initialize the runtime environment");
 831                 destroy_configuration(s_configuration);
 832                 destroy_cache_(s_cache);
 833                 return (-1);
 834         }
 835
 836         if (s_configuration->threads_num > 1) {
 837                 threads = calloc(s_configuration->threads_num,
 838                         sizeof(*threads));
 839                 for (i = 0; i < s_configuration->threads_num; ++i) {
 840                         thread_args = malloc(
 841                                 sizeof(*thread_args));
 842                         thread_args->the_cache = s_cache;
 843                         thread_args->the_runtime_env = s_runtime_env;
 844                         thread_args->the_configuration = s_configuration;
 845
 846                         LOG_MSG_1("main", "thread #%d was successfully created",
 847                                 i);
 848                         pthread_create(&threads[i], NULL, processing_thread,
 849                                 thread_args);
 850
 851                         thread_args = NULL;
 852                 }
 853
 854                 for (i = 0; i < s_configuration->threads_num; ++i)
 855                         pthread_join(threads[i], NULL);
 856         } else {
 857                 LOG_MSG_1("main", "working in single-threaded mode");
 858                 processing_loop(s_cache, s_runtime_env, s_configuration);
 859         }
 860
 861 fin:
 862         /* runtime environment destruction */
 863         destroy_runtime_env(s_runtime_env);
 864
 865         /* cache destruction */
 866         destroy_cache_(s_cache);
 867
 868         /* configuration destruction */
 869         destroy_configuration(s_configuration);
 870
 871         /* agents table destruction */
 872         destroy_agent_table(s_agent_table);
 873
 874         pidfile_remove(pidfile);
 875         return (EXIT_SUCCESS);
 876 }