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 #ifndef CONFIGFILE
  64 #       define CONFIGFILE SYSCONFDIR"/sysdb/sysdbd.conf"
  65 #endif
  66
  67 #ifndef DEFAULT_SOCKET
  68 #       define DEFAULT_SOCKET "unix:"LOCALSTATEDIR"/run/sysdbd.sock"
  69 #endif
  70
  71 static sdb_plugin_loop_t plugin_main_loop = SDB_PLUGIN_LOOP_INIT;
  72 static sdb_fe_loop_t frontend_main_loop = SDB_FE_LOOP_INIT;
  73
  74 static char *default_listen_addresses[] = {
  75         DEFAULT_SOCKET,
  76 };
  77
  78 static void
  79 sigintterm_handler(int __attribute__((unused)) signo)
  80 {
  81         frontend_main_loop.do_loop = 0;
  82 } /* sigintterm_handler */
  83
  84 static void
  85 exit_usage(char *name, int status)
  86 {
  87         printf(
  88 "Usage: %s <options>\n"
  89
  90 "\nOptions:\n"
  91 "  -C FILE   the main configuration file\n"
  92 "            default: "CONFIGFILE"\n"
  93 "  -D        do not run in background (daemonize)\n"
  94 "\n"
  95 "  -h        display this help and exit\n"
  96 "  -V        display the version number and copyright\n"
  97
  98 "\nSysDB daemon "SDB_VERSION_STRING SDB_VERSION_EXTRA", "PACKAGE_URL"\n",
  99 basename(name));
 100         exit(status);
 101 } /* exit_usage */
 102
 103 static void
 104 exit_version(void)
 105 {
 106         printf("SysDBd version "SDB_VERSION_STRING SDB_VERSION_EXTRA", "
 107                         "built "BUILD_DATE"\n"
 108                         "using libsysdb version %s%s\n"
 109                         "Copyright (C) 2012-2014 "PACKAGE_MAINTAINER"\n"
 110
 111                         "\nThis is free software under the terms of the BSD license, see "
 112                         "the source for\ncopying conditions. There is NO WARRANTY; not "
 113                         "even for MERCHANTABILITY or\nFITNESS FOR A PARTICULAR "
 114                         "PURPOSE.\n", sdb_version_string(), sdb_version_extra());
 115         exit(0);
 116 } /* exit_version */
 117
 118 static int
 119 daemonize(void)
 120 {
 121         pid_t pid;
 122
 123         if ((pid = fork()) < 0) {
 124                 char errbuf[1024];
 125                 sdb_log(SDB_LOG_ERR, "Failed to fork to background: %s",
 126                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 127                 return errno;
 128         }
 129         else if (pid != 0) {
 130                 /* parent */
 131                 exit(0);
 132         }
 133
 134         if (chdir("/")) {
 135                 char errbuf[1024];
 136                 sdb_log(SDB_LOG_ERR, "Failed to change working directory to "
 137                                 "the root directory: %s",
 138                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 139                 return errno;
 140         }
 141
 142         /* detach from session */
 143         setsid();
 144
 145         close(0);
 146         if (open("/dev/null", O_RDWR)) {
 147                 char errbuf[1024];
 148                 sdb_log(SDB_LOG_ERR, "Failed to connect stdin to '/dev/null': %s",
 149                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 150                 return errno;
 151         }
 152
 153         close(1);
 154         if (dup(0) != 1) {
 155                 char errbuf[1024];
 156                 sdb_log(SDB_LOG_ERR, "Could not connect stdout to '/dev/null': %s",
 157                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 158                 return errno;
 159         }
 160
 161         close(2);
 162         if (dup(0) != 2) {
 163                 char errbuf[1024];
 164                 sdb_log(SDB_LOG_ERR, "Could not connect stderr to '/dev/null': %s",
 165                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 166                 return errno;
 167         }
 168         return 0;
 169 } /* daemonize */
 170
 171 static void *
 172 backend_handler(void __attribute__((unused)) *data)
 173 {
 174         sdb_plugin_collector_loop(&plugin_main_loop);
 175         sdb_log(SDB_LOG_INFO, "Shutting down backend thread");
 176         return NULL;
 177 } /* backend_handler */
 178
 179 static int
 180 main_loop(void)
 181 {
 182         pthread_t backend_thread;
 183         size_t i;
 184
 185         plugin_main_loop.do_loop = 1;
 186         frontend_main_loop.do_loop = 1;
 187
 188         memset(&backend_thread, 0, sizeof(backend_thread));
 189         if (pthread_create(&backend_thread, /* attr = */ NULL,
 190                                 backend_handler, /* arg = */ NULL)) {
 191                 char buf[1024];
 192                 sdb_log(SDB_LOG_ERR, "Failed to create backend handler thread: %s",
 193                                 sdb_strerror(errno, buf, sizeof(buf)));
 194
 195                 plugin_main_loop.do_loop = 0;
 196                 return 1;
 197         }
 198
 199         sdb_fe_socket_t *sock = sdb_fe_sock_create();
 200         for (i = 0; i < listen_addresses_num; ++i)
 201                 if (sdb_fe_sock_add_listener(sock, listen_addresses[i]))
 202                         break;
 203
 204         /* break on error */
 205         if (i >= listen_addresses_num)
 206                 sdb_fe_sock_listen_and_serve(sock, &frontend_main_loop);
 207
 208         sdb_log(SDB_LOG_INFO, "Waiting for backend thread to terminate");
 209         plugin_main_loop.do_loop = 0;
 210         /* send a signal to interrupt the sleep call
 211          * and make the thread shut down faster */
 212         pthread_kill(backend_thread, SIGINT);
 213         pthread_join(backend_thread, NULL);
 214         sdb_fe_sock_destroy(sock);
 215
 216         return 0;
 217 } /* main_loop */
 218
 219 int
 220 main(int argc, char **argv)
 221 {
 222         char *config_filename = NULL;
 223         _Bool do_daemonize = 1;
 224
 225         struct sigaction sa_intterm;
 226         int status;
 227
 228         sdb_error_set_logger(sdb_plugin_log);
 229
 230         while (42) {
 231                 int opt = getopt(argc, argv, "C:DhV");
 232
 233                 if (-1 == opt)
 234                         break;
 235
 236                 switch (opt) {
 237                         case 'C':
 238                                 config_filename = optarg;
 239                                 break;
 240                         case 'D':
 241                                 do_daemonize = 0;
 242                                 break;
 243
 244                         case 'h':
 245                                 exit_usage(argv[0], 0);
 246                                 break;
 247                         case 'V':
 248                                 exit_version();
 249                                 break;
 250                         default:
 251                                 exit_usage(argv[0], 1);
 252                 }
 253         }
 254
 255         if (optind < argc)
 256                 exit_usage(argv[0], 1);
 257
 258         if (! config_filename)
 259                 config_filename = CONFIGFILE;
 260
 261         if ((status = daemon_parse_config(config_filename))) {
 262                 if (status > 0)
 263                         sdb_log(SDB_LOG_ERR, "Failed to parse configuration file.");
 264                 else
 265                         sdb_log(SDB_LOG_ERR, "Failed to load configuration file.\n"
 266                                         "\tCheck other error messages for details.");
 267                 exit(1);
 268         }
 269
 270         if (! listen_addresses) {
 271                 listen_addresses = default_listen_addresses;
 272                 listen_addresses_num = SDB_STATIC_ARRAY_LEN(default_listen_addresses);
 273         }
 274
 275         memset(&sa_intterm, 0, sizeof(sa_intterm));
 276         sa_intterm.sa_handler = sigintterm_handler;
 277         sa_intterm.sa_flags = 0;
 278
 279         if (sigaction(SIGINT, &sa_intterm, /* old action */ NULL)) {
 280                 char errbuf[1024];
 281                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 282                                 "SIGINT: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 283                 exit(1);
 284         }
 285         if (sigaction(SIGTERM, &sa_intterm, /* old action */ NULL)) {
 286                 char errbuf[1024];
 287                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 288                                 "SIGTERM: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 289                 exit(1);
 290         }
 291
 292         if (do_daemonize)
 293                 if (daemonize())
 294                         exit(1);
 295
 296         sdb_log(SDB_LOG_INFO, "SysDB daemon "SDB_VERSION_STRING
 297                         SDB_VERSION_EXTRA " (pid %i) initialized successfully",
 298                         (int)getpid());
 299
 300         sdb_plugin_init_all();
 301         plugin_main_loop.default_interval = SECS_TO_SDB_TIME(60);
 302
 303         /* ignore, we see this, for example, if a client disconnects without
 304          * closing the connection cleanly */
 305         signal(SIGPIPE, SIG_IGN);
 306
 307         sdb_connection_enable_logging();
 308         status = main_loop();
 309
 310         sdb_log(SDB_LOG_INFO, "Shutting down SysDB daemon "SDB_VERSION_STRING
 311                         SDB_VERSION_EXTRA" (pid %i)", (int)getpid());
 312         return status;
 313 } /* main */
 314
 315 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 316