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
  37 #include "frontend/connection.h"
  38 #include "frontend/sock.h"
  39
  40 #include "tools/sysdbd/configfile.h"
  41
  42 #if HAVE_LIBGEN_H
  43 #       include <libgen.h>
  44 #else /* HAVE_LIBGEN_H */
  45 #       define basename(path) (path)
  46 #endif /* ! HAVE_LIBGEN_H */
  47
  48 #include <errno.h>
  49
  50 #include <sys/stat.h>
  51 #include <fcntl.h>
  52
  53 #include <signal.h>
  54
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58
  59 #include <unistd.h>
  60
  61 #include <pthread.h>
  62
  63 #include <openssl/ssl.h>
  64 #include <openssl/err.h>
  65
  66 #ifndef CONFIGFILE
  67 #       define CONFIGFILE SYSCONFDIR"/sysdb/sysdbd.conf"
  68 #endif
  69
  70 #ifndef DEFAULT_SOCKET
  71 #       define DEFAULT_SOCKET "unix:"LOCALSTATEDIR"/run/sysdbd.sock"
  72 #endif
  73
  74 static sdb_plugin_loop_t plugin_main_loop = SDB_PLUGIN_LOOP_INIT;
  75 static sdb_fe_loop_t frontend_main_loop = SDB_FE_LOOP_INIT;
  76
  77 static char *config_filename = NULL;
  78 static int reconfigure = 0;
  79
  80 static daemon_listener_t default_listen_addresses[] = {
  81         { DEFAULT_SOCKET, SDB_SSL_DEFAULT_OPTIONS },
  82 };
  83
  84 static void
  85 sigintterm_handler(int __attribute__((unused)) signo)
  86 {
  87         frontend_main_loop.do_loop = 0;
  88 } /* sigintterm_handler */
  89
  90 static void
  91 sighup_handler(int __attribute__((unused)) signo)
  92 {
  93         /* (temporarily) terminate the plugin loop ... */
  94         frontend_main_loop.do_loop = 0;
  95         /* ... and tell the main loop to reconfigure the daemon */
  96         reconfigure = 1;
  97 } /* sighup_handler */
  98
  99 static void
 100 exit_usage(char *name, int status)
 101 {
 102         printf(
 103 "Usage: %s <options>\n"
 104
 105 "\nOptions:\n"
 106 "  -C FILE   the main configuration file\n"
 107 "            default: "CONFIGFILE"\n"
 108 "  -D        do not run in background (daemonize)\n"
 109 "\n"
 110 "  -h        display this help and exit\n"
 111 "  -V        display the version number and copyright\n"
 112
 113 "\nSysDB daemon "SDB_VERSION_STRING SDB_VERSION_EXTRA", "PACKAGE_URL"\n",
 114 basename(name));
 115         exit(status);
 116 } /* exit_usage */
 117
 118 static void
 119 exit_version(void)
 120 {
 121         printf("SysDBd version "SDB_VERSION_STRING SDB_VERSION_EXTRA", "
 122                         "built "BUILD_DATE"\n"
 123                         "using libsysdb version %s%s\n"
 124                         "Copyright (C) 2012-2014 "PACKAGE_MAINTAINER"\n"
 125
 126                         "\nThis is free software under the terms of the BSD license, see "
 127                         "the source for\ncopying conditions. There is NO WARRANTY; not "
 128                         "even for MERCHANTABILITY or\nFITNESS FOR A PARTICULAR "
 129                         "PURPOSE.\n", sdb_version_string(), sdb_version_extra());
 130         exit(0);
 131 } /* exit_version */
 132
 133 static int
 134 daemonize(void)
 135 {
 136         pid_t pid;
 137
 138         if ((pid = fork()) < 0) {
 139                 char errbuf[1024];
 140                 sdb_log(SDB_LOG_ERR, "Failed to fork to background: %s",
 141                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 142                 return errno;
 143         }
 144         else if (pid != 0) {
 145                 /* parent */
 146                 exit(0);
 147         }
 148
 149         if (chdir("/")) {
 150                 char errbuf[1024];
 151                 sdb_log(SDB_LOG_ERR, "Failed to change working directory to "
 152                                 "the root directory: %s",
 153                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 154                 return errno;
 155         }
 156
 157         /* detach from session */
 158         setsid();
 159
 160         close(0);
 161         if (open("/dev/null", O_RDWR)) {
 162                 char errbuf[1024];
 163                 sdb_log(SDB_LOG_ERR, "Failed to connect stdin to '/dev/null': %s",
 164                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 165                 return errno;
 166         }
 167
 168         close(1);
 169         if (dup(0) != 1) {
 170                 char errbuf[1024];
 171                 sdb_log(SDB_LOG_ERR, "Could not connect stdout to '/dev/null': %s",
 172                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 173                 return errno;
 174         }
 175
 176         close(2);
 177         if (dup(0) != 2) {
 178                 char errbuf[1024];
 179                 sdb_log(SDB_LOG_ERR, "Could not connect stderr to '/dev/null': %s",
 180                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 181                 return errno;
 182         }
 183         return 0;
 184 } /* daemonize */
 185
 186 static int
 187 configure(void)
 188 {
 189         int status;
 190
 191         if ((status = daemon_parse_config(config_filename))) {
 192                 if (status > 0)
 193                         sdb_log(SDB_LOG_ERR, "Failed to parse configuration file.");
 194                 else
 195                         sdb_log(SDB_LOG_ERR, "Failed to load configuration file.\n"
 196                                         "\tCheck other error messages for details.");
 197                 return 1;
 198         }
 199
 200         if (! listen_addresses) {
 201                 listen_addresses = default_listen_addresses;
 202                 listen_addresses_num = SDB_STATIC_ARRAY_LEN(default_listen_addresses);
 203         }
 204         return 0;
 205 } /* configure */
 206
 207 static int
 208 do_reconfigure(void)
 209 {
 210         int status;
 211
 212         sdb_log(SDB_LOG_INFO, "Reconfiguring SysDB daemon");
 213
 214         if (listen_addresses != default_listen_addresses)
 215                 daemon_free_listen_addresses();
 216         listen_addresses = NULL;
 217
 218         sdb_plugin_reconfigure_init();
 219         if ((status = configure()))
 220                 return status;
 221         sdb_plugin_init_all();
 222         sdb_plugin_reconfigure_finish();
 223         return 0;
 224 } /* do_reconfigure */
 225
 226 static void *
 227 backend_handler(void __attribute__((unused)) *data)
 228 {
 229         sdb_plugin_collector_loop(&plugin_main_loop);
 230         sdb_log(SDB_LOG_INFO, "Shutting down backend thread");
 231         return NULL;
 232 } /* backend_handler */
 233
 234 static int
 235 main_loop(void)
 236 {
 237         sdb_fe_socket_t *sock = sdb_fe_sock_create();
 238         pthread_t backend_thread;
 239
 240         int status = 0;
 241
 242         while (status == 0) {
 243                 size_t i;
 244
 245                 plugin_main_loop.do_loop = 1;
 246                 frontend_main_loop.do_loop = 1;
 247
 248                 memset(&backend_thread, 0, sizeof(backend_thread));
 249                 if (pthread_create(&backend_thread, /* attr = */ NULL,
 250                                         backend_handler, /* arg = */ NULL)) {
 251                         char buf[1024];
 252                         sdb_log(SDB_LOG_ERR, "Failed to create backend handler thread: %s",
 253                                         sdb_strerror(errno, buf, sizeof(buf)));
 254
 255                         plugin_main_loop.do_loop = 0;
 256                         break;
 257                 }
 258
 259                 for (i = 0; i < listen_addresses_num; ++i) {
 260                         if (sdb_fe_sock_add_listener(sock, listen_addresses[i].address,
 261                                                 &listen_addresses[i].ssl_opts)) {
 262                                 status = 1;
 263                                 break;
 264                         }
 265                 }
 266
 267                 /* break on error */
 268                 if (status)
 269                         break;
 270
 271                 sdb_log(SDB_LOG_INFO, "SysDB daemon "SDB_VERSION_STRING
 272                                 SDB_VERSION_EXTRA " (libsysdb %s%s, pid %i) initialized "
 273                                 "successfully", sdb_version_string(), sdb_version_extra(),
 274                                 (int)getpid());
 275
 276                 sdb_connection_enable_logging();
 277                 sdb_fe_sock_listen_and_serve(sock, &frontend_main_loop);
 278
 279                 sdb_log(SDB_LOG_INFO, "Waiting for backend thread to terminate");
 280                 plugin_main_loop.do_loop = 0;
 281                 /* send a signal to interrupt the sleep call
 282                  * and make the thread shut down faster */
 283                 pthread_kill(backend_thread, SIGINT);
 284                 pthread_join(backend_thread, NULL);
 285
 286                 if (! reconfigure)
 287                         break;
 288
 289                 reconfigure = 0;
 290                 sdb_fe_sock_clear_listeners(sock);
 291                 if (do_reconfigure()) {
 292                         sdb_log(SDB_LOG_ERR, "Reconfiguration failed");
 293                         status = 1;
 294                         break;
 295                 }
 296         }
 297
 298         /* clean up in case we exited the loop on error */
 299         plugin_main_loop.do_loop = 0;
 300         frontend_main_loop.do_loop = 0;
 301         pthread_kill(backend_thread, SIGINT);
 302         pthread_join(backend_thread, NULL);
 303
 304         sdb_fe_sock_destroy(sock);
 305         return status;
 306 } /* main_loop */
 307
 308 int
 309 main(int argc, char **argv)
 310 {
 311         bool do_daemonize = 1;
 312
 313         struct sigaction sa_intterm;
 314         struct sigaction sa_hup;
 315         int status;
 316
 317         sdb_error_set_logger(sdb_plugin_log);
 318
 319         while (42) {
 320                 int opt = getopt(argc, argv, "C:DhV");
 321
 322                 if (-1 == opt)
 323                         break;
 324
 325                 switch (opt) {
 326                         case 'C':
 327                                 config_filename = optarg;
 328                                 break;
 329                         case 'D':
 330                                 do_daemonize = 0;
 331                                 break;
 332
 333                         case 'h':
 334                                 exit_usage(argv[0], 0);
 335                                 break;
 336                         case 'V':
 337                                 exit_version();
 338                                 break;
 339                         default:
 340                                 exit_usage(argv[0], 1);
 341                 }
 342         }
 343
 344         if (optind < argc)
 345                 exit_usage(argv[0], 1);
 346
 347         if (! config_filename)
 348                 config_filename = CONFIGFILE;
 349         if ((status = configure()))
 350                 exit(status);
 351
 352         memset(&sa_intterm, 0, sizeof(sa_intterm));
 353         sa_intterm.sa_handler = sigintterm_handler;
 354         sa_intterm.sa_flags = 0;
 355
 356         if (sigaction(SIGINT, &sa_intterm, /* old action */ NULL)) {
 357                 char errbuf[1024];
 358                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 359                                 "SIGINT: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 360                 exit(1);
 361         }
 362         if (sigaction(SIGTERM, &sa_intterm, /* old action */ NULL)) {
 363                 char errbuf[1024];
 364                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 365                                 "SIGTERM: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 366                 exit(1);
 367         }
 368
 369         if (do_daemonize)
 370                 if (daemonize())
 371                         exit(1);
 372
 373         SSL_load_error_strings();
 374         OpenSSL_add_ssl_algorithms();
 375
 376         sdb_plugin_init_all();
 377         plugin_main_loop.default_interval = SECS_TO_SDB_TIME(60);
 378
 379         memset(&sa_hup, 0, sizeof(sa_hup));
 380         sa_hup.sa_handler = sighup_handler;
 381         sa_hup.sa_flags = 0;
 382
 383         if (sigaction(SIGHUP, &sa_hup, /* old action */ NULL)) {
 384                 char errbuf[1024];
 385                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 386                                 "SIGHUP: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 387                 exit(1);
 388         }
 389
 390         /* ignore, we see this, for example, if a client disconnects without
 391          * closing the connection cleanly */
 392         signal(SIGPIPE, SIG_IGN);
 393
 394         status = main_loop();
 395
 396         sdb_log(SDB_LOG_INFO, "Shutting down SysDB daemon "SDB_VERSION_STRING
 397                         SDB_VERSION_EXTRA" (pid %i)", (int)getpid());
 398         sdb_plugin_shutdown_all();
 399
 400         ERR_free_strings();
 401         return status;
 402 } /* main */
 403
 404 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 405