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