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 int
 180 main(int argc, char **argv)
 181 {
 182         char *config_filename = NULL;
 183         _Bool do_daemonize = 1;
 184
 185         pthread_t backend_thread;
 186
 187         struct sigaction sa_intterm;
 188         int status;
 189
 190         sdb_error_set_logger(sdb_plugin_log);
 191
 192         while (42) {
 193                 int opt = getopt(argc, argv, "C:DhV");
 194
 195                 if (-1 == opt)
 196                         break;
 197
 198                 switch (opt) {
 199                         case 'C':
 200                                 config_filename = optarg;
 201                                 break;
 202                         case 'D':
 203                                 do_daemonize = 0;
 204                                 break;
 205
 206                         case 'h':
 207                                 exit_usage(argv[0], 0);
 208                                 break;
 209                         case 'V':
 210                                 exit_version();
 211                                 break;
 212                         default:
 213                                 exit_usage(argv[0], 1);
 214                 }
 215         }
 216
 217         if (optind < argc)
 218                 exit_usage(argv[0], 1);
 219
 220         if (! config_filename)
 221                 config_filename = CONFIGFILE;
 222
 223         if ((status = daemon_parse_config(config_filename))) {
 224                 if (status > 0)
 225                         sdb_log(SDB_LOG_ERR, "Failed to parse configuration file.");
 226                 else
 227                         sdb_log(SDB_LOG_ERR, "Failed to load configuration file.\n"
 228                                         "\tCheck other error messages for details.");
 229                 exit(1);
 230         }
 231
 232         if (! listen_addresses) {
 233                 listen_addresses = default_listen_addresses;
 234                 listen_addresses_num = SDB_STATIC_ARRAY_LEN(default_listen_addresses);
 235         }
 236
 237         memset(&sa_intterm, 0, sizeof(sa_intterm));
 238         sa_intterm.sa_handler = sigintterm_handler;
 239         sa_intterm.sa_flags = 0;
 240
 241         if (sigaction(SIGINT, &sa_intterm, /* old action */ NULL)) {
 242                 char errbuf[1024];
 243                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 244                                 "SIGINT: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 245                 exit(1);
 246         }
 247         if (sigaction(SIGTERM, &sa_intterm, /* old action */ NULL)) {
 248                 char errbuf[1024];
 249                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 250                                 "SIGTERM: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 251                 exit(1);
 252         }
 253
 254         if (do_daemonize)
 255                 if (daemonize())
 256                         exit(1);
 257
 258         sdb_log(SDB_LOG_INFO, "SysDB daemon "SDB_VERSION_STRING
 259                         SDB_VERSION_EXTRA " (pid %i) initialized successfully",
 260                         (int)getpid());
 261
 262         sdb_plugin_init_all();
 263         plugin_main_loop.default_interval = SECS_TO_SDB_TIME(60);
 264
 265         memset(&backend_thread, 0, sizeof(backend_thread));
 266         if (pthread_create(&backend_thread, /* attr = */ NULL,
 267                                 backend_handler, /* arg = */ NULL)) {
 268                 char buf[1024];
 269                 sdb_log(SDB_LOG_ERR, "Failed to create backend handler thread: %s",
 270                                 sdb_strerror(errno, buf, sizeof(buf)));
 271
 272                 plugin_main_loop.do_loop = 0;
 273         }
 274         else {
 275                 size_t i;
 276
 277                 sdb_fe_socket_t *sock = sdb_fe_sock_create();
 278                 for (i = 0; i < listen_addresses_num; ++i)
 279                         if (sdb_fe_sock_add_listener(sock, listen_addresses[i]))
 280                                 break;
 281
 282                 sdb_connection_enable_logging();
 283
 284                 /* break on error */
 285                 if (i >= listen_addresses_num)
 286                         sdb_fe_sock_listen_and_serve(sock, &frontend_main_loop);
 287
 288                 sdb_log(SDB_LOG_INFO, "Waiting for backend thread to terminate");
 289                 plugin_main_loop.do_loop = 0;
 290                 pthread_kill(backend_thread, SIGINT);
 291                 pthread_join(backend_thread, NULL);
 292                 sdb_fe_sock_destroy(sock);
 293         }
 294
 295         sdb_log(SDB_LOG_INFO, "Shutting down SysDB daemon "SDB_VERSION_STRING
 296                         SDB_VERSION_EXTRA" (pid %i)", (int)getpid());
 297         return 0;
 298 } /* main */
 299
 300 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 301