src/daemon/sysdbd.c

   1 /*
   2  * SysDB - src/sysdbd.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/string.h"
  37
  38 #include "daemon/config.h"
  39
  40 #if HAVE_LIBGEN_H
  41 #       include <libgen.h>
  42 #else /* HAVE_LIBGEN_H */
  43 #       define basename(path) (path)
  44 #endif /* ! HAVE_LIBGEN_H */
  45
  46 #include <errno.h>
  47
  48 #include <sys/stat.h>
  49 #include <fcntl.h>
  50
  51 #include <signal.h>
  52
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56
  57 #include <unistd.h>
  58
  59 #ifndef CONFIGFILE
  60 #       define CONFIGFILE SYSCONFDIR"/sysdb/sysdbd.conf"
  61 #endif
  62
  63 static sdb_plugin_loop_t plugin_main_loop = SDB_PLUGIN_LOOP_INIT;
  64
  65 static void
  66 sigintterm_handler(int __attribute__((unused)) signo)
  67 {
  68         plugin_main_loop.do_loop = 0;
  69 } /* sigintterm_handler */
  70
  71 static void
  72 exit_usage(char *name, int status)
  73 {
  74         printf(
  75 "Usage: %s <options>\n"
  76
  77 "\nOptions:\n"
  78 "  -C FILE   the main configuration file\n"
  79 "            default: "CONFIGFILE"\n"
  80 "  -d        run in background (daemonize)\n"
  81 "\n"
  82 "  -h        display this help and exit\n"
  83 "  -V        display the version number and copyright\n"
  84
  85 "\nSysDB daemon "SDB_VERSION_STRING SDB_VERSION_EXTRA", "PACKAGE_URL"\n",
  86 basename(name));
  87         exit(status);
  88 } /* exit_usage */
  89
  90 static void
  91 exit_version(void)
  92 {
  93         printf("SysDBd version "SDB_VERSION_STRING SDB_VERSION_EXTRA", "
  94                         "built "BUILD_DATE"\n"
  95                         "using libsysdb verion %s%s\n"
  96                         "Copyright (C) 2012 "PACKAGE_MAINTAINER"\n"
  97
  98                         "\nThis is free software under the terms of the BSD license, see "
  99                         "the source for\ncopying conditions. There is NO WARRANTY; not "
 100                         "even for MERCHANTABILITY or\nFITNESS FOR A PARTICULAR "
 101                         "PURPOSE.\n", sdb_version_string(), sdb_version_extra());
 102         exit(0);
 103 } /* exit_version */
 104
 105 static int
 106 daemonize(void)
 107 {
 108         pid_t pid;
 109
 110         if ((pid = fork()) < 0) {
 111                 char errbuf[1024];
 112                 sdb_log(SDB_LOG_ERR, "Failed to fork to background: %s\n",
 113                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 114                 return errno;
 115         }
 116         else if (pid != 0) {
 117                 /* parent */
 118                 exit(0);
 119         }
 120
 121         if (chdir("/")) {
 122                 char errbuf[1024];
 123                 sdb_log(SDB_LOG_ERR, "Failed to change working directory to "
 124                                 "the root directory: %s\n",
 125                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 126                 return errno;
 127         }
 128
 129         /* detach from session */
 130         setsid();
 131
 132         close(0);
 133         if (open("/dev/null", O_RDWR)) {
 134                 char errbuf[1024];
 135                 sdb_log(SDB_LOG_ERR, "Failed to connect stdin to '/dev/null': "
 136                                 "%s\n", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 137                 return errno;
 138         }
 139
 140         close(1);
 141         if (dup(0) != 1) {
 142                 char errbuf[1024];
 143                 sdb_log(SDB_LOG_ERR, "Could not connect stdout to '/dev/null': "
 144                                 "%s\n", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 145                 return errno;
 146         }
 147
 148         close(2);
 149         if (dup(0) != 2) {
 150                 char errbuf[1024];
 151                 sdb_log(SDB_LOG_ERR, "Could not connect stderr to '/dev/null': "
 152                                 "%s\n", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 153                 return errno;
 154         }
 155         return 0;
 156 } /* daemonize */
 157
 158 int
 159 main(int argc, char **argv)
 160 {
 161         char *config_filename = NULL;
 162         _Bool do_daemonize = 0;
 163
 164         struct sigaction sa_intterm;
 165
 166         while (42) {
 167                 int opt = getopt(argc, argv, "C:dhV");
 168
 169                 if (-1 == opt)
 170                         break;
 171
 172                 switch (opt) {
 173                         case 'C':
 174                                 config_filename = optarg;
 175                                 break;
 176                         case 'd':
 177                                 do_daemonize = 1;
 178                                 break;
 179
 180                         case 'h':
 181                                 exit_usage(argv[0], 0);
 182                                 break;
 183                         case 'V':
 184                                 exit_version();
 185                                 break;
 186                         default:
 187                                 exit_usage(argv[0], 1);
 188                 }
 189         }
 190
 191         if (optind < argc)
 192                 exit_usage(argv[0], 1);
 193
 194         if (! config_filename)
 195                 config_filename = CONFIGFILE;
 196
 197         if (daemon_parse_config(config_filename)) {
 198                 sdb_log(SDB_LOG_ERR, "Failed to parse configuration file.\n");
 199                 exit(1);
 200         }
 201
 202         memset(&sa_intterm, 0, sizeof(sa_intterm));
 203         sa_intterm.sa_handler = sigintterm_handler;
 204         sa_intterm.sa_flags = 0;
 205
 206         if (sigaction(SIGINT, &sa_intterm, /* old action */ NULL)) {
 207                 char errbuf[1024];
 208                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 209                                 "SIGINT: %s\n", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 210                 exit(1);
 211         }
 212         if (sigaction(SIGTERM, &sa_intterm, /* old action */ NULL)) {
 213                 char errbuf[1024];
 214                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 215                                 "SIGTERM: %s\n", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 216                 exit(1);
 217         }
 218
 219         if (do_daemonize)
 220                 if (daemonize())
 221                         exit(1);
 222
 223         sdb_log(SDB_LOG_INFO, "SysDB daemon "SDB_VERSION_STRING
 224                         SDB_VERSION_EXTRA " (pid %i) initialized successfully\n",
 225                         (int)getpid());
 226
 227         sdb_plugin_init_all();
 228         sdb_plugin_collector_loop(&plugin_main_loop);
 229
 230         sdb_log(SDB_LOG_INFO, "Shutting down SysDB daemon "SDB_VERSION_STRING
 231                         SDB_VERSION_EXTRA" (pid %i)\n", (int)getpid());
 232
 233         fprintf(stderr, "Store dump:\n");
 234         sdb_store_dump(stderr);
 235         return 0;
 236 } /* main */
 237
 238 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 239