src/tools/sysdbd/main.c

   1 /*
   2  * SysDB - src/tools/sysdbd/main.c
   3  * Copyright (C) 2012 Sebastian 'tokkee' Harl <sh@tokkee.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  16  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  17  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
  19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #if HAVE_CONFIG_H
  29 #       include "config.h"
  30 #endif /* HAVE_CONFIG_H */
  31
  32 #include "sysdb.h"
  33 #include "core/plugin.h"
  34 #include "core/store.h"
  35 #include "utils/error.h"
  36 #include "utils/ssl.h"
  37
  38 #include "frontend/connection.h"
  39 #include "frontend/sock.h"
  40
  41 #include "tools/sysdbd/configfile.h"
  42
  43 #if HAVE_LIBGEN_H
  44 #       include <libgen.h>
  45 #else /* HAVE_LIBGEN_H */
  46 #       define basename(path) (path)
  47 #endif /* ! HAVE_LIBGEN_H */
  48
  49 #include <errno.h>
  50 #include <time.h>
  51
  52 #include <sys/stat.h>
  53 #include <fcntl.h>
  54
  55 #include <signal.h>
  56
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60
  61 #include <unistd.h>
  62
  63 #include <pthread.h>
  64
  65 #ifndef CONFIGFILE
  66 #       define CONFIGFILE SYSCONFDIR"/sysdb/sysdbd.conf"
  67 #endif
  68
  69 #ifndef DEFAULT_SOCKET
  70 #       define DEFAULT_SOCKET "unix:"LOCALSTATEDIR"/run/sysdbd.sock"
  71 #endif
  72
  73 static sdb_plugin_loop_t plugin_main_loop = SDB_PLUGIN_LOOP_INIT;
  74 static sdb_fe_loop_t frontend_main_loop = SDB_FE_LOOP_INIT;
  75
  76 static char *config_filename = NULL;
  77 static int reconfigure = 0;
  78
  79 static daemon_listener_t default_listen_addresses[] = {
  80         { DEFAULT_SOCKET, SDB_SSL_DEFAULT_OPTIONS },
  81 };
  82
  83 static void
  84 sigintterm_handler(int __attribute__((unused)) signo)
  85 {
  86         frontend_main_loop.do_loop = 0;
  87 } /* sigintterm_handler */
  88
  89 static void
  90 sighup_handler(int __attribute__((unused)) signo)
  91 {
  92         /* (temporarily) terminate the plugin loop ... */
  93         frontend_main_loop.do_loop = 0;
  94         /* ... and tell the main loop to reconfigure the daemon */
  95         reconfigure = 1;
  96 } /* sighup_handler */
  97
  98 static void
  99 exit_usage(char *name, int status)
 100 {
 101         printf(
 102 "Usage: %s <options>\n"
 103
 104 "\nOptions:\n"
 105 "  -C FILE   the main configuration file\n"
 106 "            default: "CONFIGFILE"\n"
 107 "  -D        do not run in background (daemonize)\n"
 108 "\n"
 109 "  -h        display this help and exit\n"
 110 "  -V        display the version number and copyright\n"
 111
 112 "\nSysDB daemon "SDB_VERSION_STRING SDB_VERSION_EXTRA", "PACKAGE_URL"\n",
 113 basename(name));
 114         exit(status);
 115 } /* exit_usage */
 116
 117 static void
 118 exit_version(void)
 119 {
 120         printf("SysDBd version "SDB_VERSION_STRING SDB_VERSION_EXTRA", "
 121                         "built "BUILD_DATE"\n"
 122                         "using libsysdb version %s%s\n"
 123                         "Copyright (C) 2012-2014 "PACKAGE_MAINTAINER"\n"
 124
 125                         "\nThis is free software under the terms of the BSD license, see "
 126                         "the source for\ncopying conditions. There is NO WARRANTY; not "
 127                         "even for MERCHANTABILITY or\nFITNESS FOR A PARTICULAR "
 128                         "PURPOSE.\n", sdb_version_string(), sdb_version_extra());
 129         exit(0);
 130 } /* exit_version */
 131
 132 static int
 133 daemonize(void)
 134 {
 135         pid_t pid;
 136
 137         if ((pid = fork()) < 0) {
 138                 char errbuf[1024];
 139                 sdb_log(SDB_LOG_ERR, "Failed to fork to background: %s",
 140                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 141                 return errno;
 142         }
 143         else if (pid != 0) {
 144                 /* parent */
 145                 exit(0);
 146         }
 147
 148         if (chdir("/")) {
 149                 char errbuf[1024];
 150                 sdb_log(SDB_LOG_ERR, "Failed to change working directory to "
 151                                 "the root directory: %s",
 152                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 153                 return errno;
 154         }
 155
 156         /* detach from session */
 157         setsid();
 158
 159         close(0);
 160         if (open("/dev/null", O_RDWR)) {
 161                 char errbuf[1024];
 162                 sdb_log(SDB_LOG_ERR, "Failed to connect stdin to '/dev/null': %s",
 163                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 164                 return errno;
 165         }
 166
 167         close(1);
 168         if (dup(0) != 1) {
 169                 char errbuf[1024];
 170                 sdb_log(SDB_LOG_ERR, "Could not connect stdout to '/dev/null': %s",
 171                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 172                 return errno;
 173         }
 174
 175         close(2);
 176         if (dup(0) != 2) {
 177                 char errbuf[1024];
 178                 sdb_log(SDB_LOG_ERR, "Could not connect stderr to '/dev/null': %s",
 179                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 180                 return errno;
 181         }
 182         return 0;
 183 } /* daemonize */
 184
 185 static int
 186 configure(void)
 187 {
 188         int status;
 189
 190         if ((status = daemon_parse_config(config_filename))) {
 191                 if (status > 0)
 192                         sdb_log(SDB_LOG_ERR, "Failed to parse configuration file.");
 193                 else
 194                         sdb_log(SDB_LOG_ERR, "Failed to load configuration file.\n"
 195                                         "\tCheck other error messages for details.");
 196                 return 1;
 197         }
 198
 199         if (! listen_addresses) {
 200                 listen_addresses = default_listen_addresses;
 201                 listen_addresses_num = SDB_STATIC_ARRAY_LEN(default_listen_addresses);
 202         }
 203         return 0;
 204 } /* configure */
 205
 206 static int
 207 do_reconfigure(void)
 208 {
 209         int status;
 210
 211         sdb_log(SDB_LOG_INFO, "Reconfiguring SysDB daemon");
 212
 213         if (listen_addresses != default_listen_addresses)
 214                 daemon_free_listen_addresses();
 215         listen_addresses = NULL;
 216
 217         sdb_plugin_reconfigure_init();
 218         if ((status = configure()))
 219                 return status;
 220         sdb_plugin_init_all();
 221         sdb_plugin_reconfigure_finish();
 222         return 0;
 223 } /* do_reconfigure */
 224
 225 static void *
 226 backend_handler(void __attribute__((unused)) *data)
 227 {
 228         sdb_plugin_collector_loop(&plugin_main_loop);
 229         sdb_log(SDB_LOG_INFO, "Shutting down backend thread");
 230         return NULL;
 231 } /* backend_handler */
 232
 233 static int
 234 main_loop(void)
 235 {
 236         sdb_fe_socket_t *sock = sdb_fe_sock_create();
 237         pthread_t backend_thread;
 238
 239         int status = 0;
 240
 241         while (status == 0) {
 242                 size_t i;
 243
 244                 plugin_main_loop.do_loop = 1;
 245                 frontend_main_loop.do_loop = 1;
 246
 247                 memset(&backend_thread, 0, sizeof(backend_thread));
 248                 if (pthread_create(&backend_thread, /* attr = */ NULL,
 249                                         backend_handler, /* arg = */ NULL)) {
 250                         char buf[1024];
 251                         sdb_log(SDB_LOG_ERR, "Failed to create backend handler thread: %s",
 252                                         sdb_strerror(errno, buf, sizeof(buf)));
 253
 254                         plugin_main_loop.do_loop = 0;
 255                         break;
 256                 }
 257
 258                 for (i = 0; i < listen_addresses_num; ++i) {
 259                         if (sdb_fe_sock_add_listener(sock, listen_addresses[i].address,
 260                                                 &listen_addresses[i].ssl_opts)) {
 261                                 status = 1;
 262                                 break;
 263                         }
 264                 }
 265
 266                 /* break on error */
 267                 if (status)
 268                         break;
 269
 270                 sdb_log(SDB_LOG_INFO, "SysDB daemon "SDB_VERSION_STRING
 271                                 SDB_VERSION_EXTRA " (libsysdb %s%s, pid %i) initialized "
 272                                 "successfully", sdb_version_string(), sdb_version_extra(),
 273                                 (int)getpid());
 274
 275                 sdb_connection_enable_logging();
 276                 sdb_fe_sock_listen_and_serve(sock, &frontend_main_loop);
 277
 278                 sdb_log(SDB_LOG_INFO, "Waiting for backend thread to terminate");
 279                 plugin_main_loop.do_loop = 0;
 280                 /* send a signal to interrupt the sleep call
 281                  * and make the thread shut down faster */
 282                 pthread_kill(backend_thread, SIGINT);
 283                 pthread_join(backend_thread, NULL);
 284
 285                 if (! reconfigure)
 286                         break;
 287
 288                 reconfigure = 0;
 289                 sdb_fe_sock_clear_listeners(sock);
 290                 if (do_reconfigure()) {
 291                         sdb_log(SDB_LOG_ERR, "Reconfiguration failed");
 292                         status = 1;
 293                         break;
 294                 }
 295         }
 296
 297         /* clean up in case we exited the loop on error */
 298         plugin_main_loop.do_loop = 0;
 299         frontend_main_loop.do_loop = 0;
 300         pthread_kill(backend_thread, SIGINT);
 301         pthread_join(backend_thread, NULL);
 302
 303         sdb_fe_sock_destroy(sock);
 304         return status;
 305 } /* main_loop */
 306
 307 int
 308 main(int argc, char **argv)
 309 {
 310         bool do_daemonize = 1;
 311
 312         struct sigaction sa_intterm;
 313         struct sigaction sa_hup;
 314         int status;
 315
 316         sdb_error_set_logger(sdb_plugin_log);
 317
 318         while (42) {
 319                 int opt = getopt(argc, argv, "C:DhV");
 320
 321                 if (-1 == opt)
 322                         break;
 323
 324                 switch (opt) {
 325                         case 'C':
 326                                 config_filename = optarg;
 327                                 break;
 328                         case 'D':
 329                                 do_daemonize = 0;
 330                                 break;
 331
 332                         case 'h':
 333                                 exit_usage(argv[0], 0);
 334                                 break;
 335                         case 'V':
 336                                 exit_version();
 337                                 break;
 338                         default:
 339                                 exit_usage(argv[0], 1);
 340                 }
 341         }
 342
 343         if (optind < argc)
 344                 exit_usage(argv[0], 1);
 345
 346         if (! config_filename)
 347                 config_filename = CONFIGFILE;
 348         if ((status = configure()))
 349                 exit(status);
 350
 351         memset(&sa_intterm, 0, sizeof(sa_intterm));
 352         sa_intterm.sa_handler = sigintterm_handler;
 353         sa_intterm.sa_flags = 0;
 354
 355         if (sigaction(SIGINT, &sa_intterm, /* old action */ NULL)) {
 356                 char errbuf[1024];
 357                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 358                                 "SIGINT: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 359                 exit(1);
 360         }
 361         if (sigaction(SIGTERM, &sa_intterm, /* old action */ NULL)) {
 362                 char errbuf[1024];
 363                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 364                                 "SIGTERM: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 365                 exit(1);
 366         }
 367
 368         if (do_daemonize)
 369                 if (daemonize())
 370                         exit(1);
 371
 372         if (sdb_ssl_init())
 373                 exit(1);
 374         sdb_plugin_init_all();
 375         plugin_main_loop.default_interval = SECS_TO_SDB_TIME(60);
 376
 377         memset(&sa_hup, 0, sizeof(sa_hup));
 378         sa_hup.sa_handler = sighup_handler;
 379         sa_hup.sa_flags = 0;
 380
 381         if (sigaction(SIGHUP, &sa_hup, /* old action */ NULL)) {
 382                 char errbuf[1024];
 383                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 384                                 "SIGHUP: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 385                 exit(1);
 386         }
 387
 388         /* ignore, we see this, for example, if a client disconnects without
 389          * closing the connection cleanly */
 390         signal(SIGPIPE, SIG_IGN);
 391
 392         status = main_loop();
 393
 394         sdb_log(SDB_LOG_INFO, "Shutting down SysDB daemon "SDB_VERSION_STRING
 395                         SDB_VERSION_EXTRA" (pid %i)", (int)getpid());
 396         sdb_plugin_shutdown_all();
 397         sdb_plugin_unregister_all();
 398         sdb_ssl_shutdown();
 399         return status;
 400 } /* main */
 401
 402 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 403