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 store_init(void)
 186 {
 187         sdb_store_t *store = sdb_store_create();
 188
 189         if (! store) {
 190                 sdb_log(SDB_LOG_ERR, "store: Failed to allocate store");
 191                 return -1;
 192         }
 193         if (sdb_plugin_register_writer("memstore",
 194                                 &sdb_store_writer, SDB_OBJ(store))) {
 195                 sdb_object_deref(SDB_OBJ(store));
 196                 return -1;
 197         }
 198         if (sdb_plugin_register_reader("memstore",
 199                                 &sdb_store_reader, SDB_OBJ(store))) {
 200                 sdb_object_deref(SDB_OBJ(store));
 201                 return -1;
 202         }
 203
 204         /* Pass ownership to the plugins */
 205         sdb_object_deref(SDB_OBJ(store));
 206         return 0;
 207 } /* store_init */
 208
 209 static int
 210 configure(void)
 211 {
 212         int status;
 213
 214         if ((status = daemon_parse_config(config_filename))) {
 215                 if (status > 0)
 216                         sdb_log(SDB_LOG_ERR, "Failed to parse configuration file.");
 217                 else
 218                         sdb_log(SDB_LOG_ERR, "Failed to load configuration file.\n"
 219                                         "\tCheck other error messages for details.");
 220                 return 1;
 221         }
 222         if (store_init()) {
 223                 sdb_log(SDB_LOG_ERR, "Failed to initialize the store");
 224                 return 1;
 225         }
 226
 227         if (! listen_addresses) {
 228                 listen_addresses = default_listen_addresses;
 229                 listen_addresses_num = SDB_STATIC_ARRAY_LEN(default_listen_addresses);
 230         }
 231         return 0;
 232 } /* configure */
 233
 234 static int
 235 do_reconfigure(void)
 236 {
 237         int status;
 238
 239         sdb_log(SDB_LOG_INFO, "Reconfiguring SysDB daemon");
 240
 241         if (listen_addresses != default_listen_addresses)
 242                 daemon_free_listen_addresses();
 243         listen_addresses = NULL;
 244
 245         sdb_plugin_reconfigure_init();
 246         if ((status = configure()))
 247                 return status;
 248         sdb_plugin_init_all();
 249         sdb_plugin_reconfigure_finish();
 250         return 0;
 251 } /* do_reconfigure */
 252
 253 static void *
 254 backend_handler(void __attribute__((unused)) *data)
 255 {
 256         sdb_plugin_collector_loop(&plugin_main_loop);
 257         sdb_log(SDB_LOG_INFO, "Shutting down backend thread");
 258         return NULL;
 259 } /* backend_handler */
 260
 261 static int
 262 main_loop(void)
 263 {
 264         sdb_fe_socket_t *sock = sdb_fe_sock_create();
 265         pthread_t backend_thread;
 266
 267         int status = 0;
 268
 269         while (status == 0) {
 270                 size_t i;
 271
 272                 plugin_main_loop.do_loop = 1;
 273                 frontend_main_loop.do_loop = 1;
 274
 275                 memset(&backend_thread, 0, sizeof(backend_thread));
 276                 if (pthread_create(&backend_thread, /* attr = */ NULL,
 277                                         backend_handler, /* arg = */ NULL)) {
 278                         char buf[1024];
 279                         sdb_log(SDB_LOG_ERR, "Failed to create backend handler thread: %s",
 280                                         sdb_strerror(errno, buf, sizeof(buf)));
 281
 282                         plugin_main_loop.do_loop = 0;
 283                         break;
 284                 }
 285
 286                 for (i = 0; i < listen_addresses_num; ++i) {
 287                         if (sdb_fe_sock_add_listener(sock, listen_addresses[i].address,
 288                                                 &listen_addresses[i].ssl_opts)) {
 289                                 status = 1;
 290                                 break;
 291                         }
 292                 }
 293
 294                 /* break on error */
 295                 if (status)
 296                         break;
 297
 298                 sdb_log(SDB_LOG_INFO, "SysDB daemon "SDB_VERSION_STRING
 299                                 SDB_VERSION_EXTRA " (libsysdb %s%s, pid %i) initialized "
 300                                 "successfully", sdb_version_string(), sdb_version_extra(),
 301                                 (int)getpid());
 302
 303                 sdb_connection_enable_logging();
 304                 sdb_fe_sock_listen_and_serve(sock, &frontend_main_loop);
 305
 306                 sdb_log(SDB_LOG_INFO, "Waiting for backend thread to terminate");
 307                 plugin_main_loop.do_loop = 0;
 308                 /* send a signal to interrupt the sleep call
 309                  * and make the thread shut down faster */
 310                 pthread_kill(backend_thread, SIGINT);
 311                 pthread_join(backend_thread, NULL);
 312
 313                 if (! reconfigure)
 314                         break;
 315
 316                 reconfigure = 0;
 317                 sdb_fe_sock_clear_listeners(sock);
 318                 if (do_reconfigure()) {
 319                         sdb_log(SDB_LOG_ERR, "Reconfiguration failed");
 320                         status = 1;
 321                         break;
 322                 }
 323         }
 324
 325         /* clean up in case we exited the loop on error */
 326         plugin_main_loop.do_loop = 0;
 327         frontend_main_loop.do_loop = 0;
 328         pthread_kill(backend_thread, SIGINT);
 329         pthread_join(backend_thread, NULL);
 330
 331         sdb_fe_sock_destroy(sock);
 332         return status;
 333 } /* main_loop */
 334
 335 int
 336 main(int argc, char **argv)
 337 {
 338         bool do_daemonize = 1;
 339
 340         struct sigaction sa_intterm;
 341         struct sigaction sa_hup;
 342         int status;
 343
 344         sdb_error_set_logger(sdb_plugin_log);
 345
 346         while (42) {
 347                 int opt = getopt(argc, argv, "C:DhV");
 348
 349                 if (-1 == opt)
 350                         break;
 351
 352                 switch (opt) {
 353                         case 'C':
 354                                 config_filename = optarg;
 355                                 break;
 356                         case 'D':
 357                                 do_daemonize = 0;
 358                                 break;
 359
 360                         case 'h':
 361                                 exit_usage(argv[0], 0);
 362                                 break;
 363                         case 'V':
 364                                 exit_version();
 365                                 break;
 366                         default:
 367                                 exit_usage(argv[0], 1);
 368                 }
 369         }
 370
 371         if (optind < argc)
 372                 exit_usage(argv[0], 1);
 373
 374         if (! config_filename)
 375                 config_filename = CONFIGFILE;
 376         if ((status = configure()))
 377                 exit(status);
 378
 379         memset(&sa_intterm, 0, sizeof(sa_intterm));
 380         sa_intterm.sa_handler = sigintterm_handler;
 381         sa_intterm.sa_flags = 0;
 382
 383         if (sigaction(SIGINT, &sa_intterm, /* old action */ NULL)) {
 384                 char errbuf[1024];
 385                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 386                                 "SIGINT: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 387                 exit(1);
 388         }
 389         if (sigaction(SIGTERM, &sa_intterm, /* old action */ NULL)) {
 390                 char errbuf[1024];
 391                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 392                                 "SIGTERM: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 393                 exit(1);
 394         }
 395
 396         if (do_daemonize)
 397                 if (daemonize())
 398                         exit(1);
 399
 400         if (sdb_ssl_init())
 401                 exit(1);
 402         sdb_plugin_init_all();
 403         plugin_main_loop.default_interval = SECS_TO_SDB_TIME(60);
 404
 405         memset(&sa_hup, 0, sizeof(sa_hup));
 406         sa_hup.sa_handler = sighup_handler;
 407         sa_hup.sa_flags = 0;
 408
 409         if (sigaction(SIGHUP, &sa_hup, /* old action */ NULL)) {
 410                 char errbuf[1024];
 411                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 412                                 "SIGHUP: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 413                 exit(1);
 414         }
 415
 416         /* ignore, we see this, for example, if a client disconnects without
 417          * closing the connection cleanly */
 418         signal(SIGPIPE, SIG_IGN);
 419
 420         status = main_loop();
 421
 422         sdb_log(SDB_LOG_INFO, "Shutting down SysDB daemon "SDB_VERSION_STRING
 423                         SDB_VERSION_EXTRA" (pid %i)", (int)getpid());
 424         sdb_plugin_shutdown_all();
 425         sdb_plugin_unregister_all();
 426         sdb_ssl_shutdown();
 427         return status;
 428 } /* main */
 429
 430 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 431