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 "core/error.h"
  36
  37 #include "frontend/sock.h"
  38
  39 #include "daemon/config.h"
  40
  41 #if HAVE_LIBGEN_H
  42 #       include <libgen.h>
  43 #else /* HAVE_LIBGEN_H */
  44 #       define basename(path) (path)
  45 #endif /* ! HAVE_LIBGEN_H */
  46
  47 #include <errno.h>
  48
  49 #include <sys/stat.h>
  50 #include <fcntl.h>
  51
  52 #include <signal.h>
  53
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57
  58 #include <unistd.h>
  59
  60 #include <pthread.h>
  61
  62 #ifndef CONFIGFILE
  63 #       define CONFIGFILE SYSCONFDIR"/sysdb/sysdbd.conf"
  64 #endif
  65
  66 #ifndef DEFAULT_SOCKET
  67 #       define DEFAULT_SOCKET "unix:"LOCALSTATEDIR"/run/sysdbd.sock"
  68 #endif
  69
  70 static sdb_plugin_loop_t plugin_main_loop = SDB_PLUGIN_LOOP_INIT;
  71 static sdb_fe_loop_t frontend_main_loop = SDB_FE_LOOP_INIT;
  72
  73 static char *default_listen_addresses[] = {
  74         DEFAULT_SOCKET,
  75 };
  76
  77 static void
  78 sigintterm_handler(int __attribute__((unused)) signo)
  79 {
  80         frontend_main_loop.do_loop = 0;
  81 } /* sigintterm_handler */
  82
  83 static void
  84 exit_usage(char *name, int status)
  85 {
  86         printf(
  87 "Usage: %s <options>\n"
  88
  89 "\nOptions:\n"
  90 "  -C FILE   the main configuration file\n"
  91 "            default: "CONFIGFILE"\n"
  92 "  -d        run in background (daemonize)\n"
  93 "\n"
  94 "  -h        display this help and exit\n"
  95 "  -V        display the version number and copyright\n"
  96
  97 "\nSysDB daemon "SDB_VERSION_STRING SDB_VERSION_EXTRA", "PACKAGE_URL"\n",
  98 basename(name));
  99         exit(status);
 100 } /* exit_usage */
 101
 102 static void
 103 exit_version(void)
 104 {
 105         printf("SysDBd version "SDB_VERSION_STRING SDB_VERSION_EXTRA", "
 106                         "built "BUILD_DATE"\n"
 107                         "using libsysdb verion %s%s\n"
 108                         "Copyright (C) 2012 "PACKAGE_MAINTAINER"\n"
 109
 110                         "\nThis is free software under the terms of the BSD license, see "
 111                         "the source for\ncopying conditions. There is NO WARRANTY; not "
 112                         "even for MERCHANTABILITY or\nFITNESS FOR A PARTICULAR "
 113                         "PURPOSE.\n", sdb_version_string(), sdb_version_extra());
 114         exit(0);
 115 } /* exit_version */
 116
 117 static int
 118 daemonize(void)
 119 {
 120         pid_t pid;
 121
 122         if ((pid = fork()) < 0) {
 123                 char errbuf[1024];
 124                 sdb_log(SDB_LOG_ERR, "Failed to fork to background: %s",
 125                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 126                 return errno;
 127         }
 128         else if (pid != 0) {
 129                 /* parent */
 130                 exit(0);
 131         }
 132
 133         if (chdir("/")) {
 134                 char errbuf[1024];
 135                 sdb_log(SDB_LOG_ERR, "Failed to change working directory to "
 136                                 "the root directory: %s",
 137                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 138                 return errno;
 139         }
 140
 141         /* detach from session */
 142         setsid();
 143
 144         close(0);
 145         if (open("/dev/null", O_RDWR)) {
 146                 char errbuf[1024];
 147                 sdb_log(SDB_LOG_ERR, "Failed to connect stdin to '/dev/null': %s",
 148                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 149                 return errno;
 150         }
 151
 152         close(1);
 153         if (dup(0) != 1) {
 154                 char errbuf[1024];
 155                 sdb_log(SDB_LOG_ERR, "Could not connect stdout to '/dev/null': %s",
 156                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 157                 return errno;
 158         }
 159
 160         close(2);
 161         if (dup(0) != 2) {
 162                 char errbuf[1024];
 163                 sdb_log(SDB_LOG_ERR, "Could not connect stderr to '/dev/null': %s",
 164                                 sdb_strerror(errno, errbuf, sizeof(errbuf)));
 165                 return errno;
 166         }
 167         return 0;
 168 } /* daemonize */
 169
 170 static void *
 171 backend_handler(void __attribute__((unused)) *data)
 172 {
 173         sdb_plugin_collector_loop(&plugin_main_loop);
 174         return NULL;
 175 } /* backend_handler */
 176
 177 int
 178 main(int argc, char **argv)
 179 {
 180         char *config_filename = NULL;
 181         _Bool do_daemonize = 0;
 182
 183         pthread_t backend_thread;
 184
 185         struct sigaction sa_intterm;
 186         int status;
 187
 188         while (42) {
 189                 int opt = getopt(argc, argv, "C:dhV");
 190
 191                 if (-1 == opt)
 192                         break;
 193
 194                 switch (opt) {
 195                         case 'C':
 196                                 config_filename = optarg;
 197                                 break;
 198                         case 'd':
 199                                 do_daemonize = 1;
 200                                 break;
 201
 202                         case 'h':
 203                                 exit_usage(argv[0], 0);
 204                                 break;
 205                         case 'V':
 206                                 exit_version();
 207                                 break;
 208                         default:
 209                                 exit_usage(argv[0], 1);
 210                 }
 211         }
 212
 213         if (optind < argc)
 214                 exit_usage(argv[0], 1);
 215
 216         if (! config_filename)
 217                 config_filename = CONFIGFILE;
 218
 219         if ((status = daemon_parse_config(config_filename))) {
 220                 if (status > 0)
 221                         sdb_log(SDB_LOG_ERR, "Failed to parse configuration file.");
 222                 else
 223                         sdb_log(SDB_LOG_ERR, "Failed to load configuration file.\n"
 224                                         "\tCheck other error messages for details.");
 225                 exit(1);
 226         }
 227
 228         if (! listen_addresses) {
 229                 listen_addresses = default_listen_addresses;
 230                 listen_addresses_num = SDB_STATIC_ARRAY_LEN(default_listen_addresses);
 231         }
 232
 233         memset(&sa_intterm, 0, sizeof(sa_intterm));
 234         sa_intterm.sa_handler = sigintterm_handler;
 235         sa_intterm.sa_flags = 0;
 236
 237         if (sigaction(SIGINT, &sa_intterm, /* old action */ NULL)) {
 238                 char errbuf[1024];
 239                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 240                                 "SIGINT: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 241                 exit(1);
 242         }
 243         if (sigaction(SIGTERM, &sa_intterm, /* old action */ NULL)) {
 244                 char errbuf[1024];
 245                 sdb_log(SDB_LOG_ERR, "Failed to install signal handler for "
 246                                 "SIGTERM: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 247                 exit(1);
 248         }
 249
 250         if (do_daemonize)
 251                 if (daemonize())
 252                         exit(1);
 253
 254         sdb_log(SDB_LOG_INFO, "SysDB daemon "SDB_VERSION_STRING
 255                         SDB_VERSION_EXTRA " (pid %i) initialized successfully",
 256                         (int)getpid());
 257
 258         sdb_plugin_init_all();
 259         plugin_main_loop.default_interval = SECS_TO_SDB_TIME(60);
 260
 261         memset(&backend_thread, 0, sizeof(backend_thread));
 262         if (pthread_create(&backend_thread, /* attr = */ NULL,
 263                                 backend_handler, /* arg = */ NULL)) {
 264                 char buf[1024];
 265                 sdb_log(SDB_LOG_ERR, "Failed to create backend handler thread: %s",
 266                                 sdb_strerror(errno, buf, sizeof(buf)));
 267
 268                 plugin_main_loop.do_loop = 0;
 269         }
 270         else {
 271                 size_t i;
 272
 273                 sdb_fe_socket_t *sock = sdb_fe_sock_create();
 274                 for (i = 0; i < listen_addresses_num; ++i)
 275                         if (sdb_fe_sock_add_listener(sock, listen_addresses[i]))
 276                                 break;
 277
 278                 /* break on error */
 279                 if (i >= listen_addresses_num)
 280                         sdb_fe_sock_listen_and_serve(sock, &frontend_main_loop);
 281
 282                 sdb_log(SDB_LOG_INFO, "Waiting for backend thread to terminate");
 283                 plugin_main_loop.do_loop = 0;
 284                 pthread_join(backend_thread, NULL);
 285                 sdb_fe_sock_destroy(sock);
 286         }
 287
 288         sdb_log(SDB_LOG_INFO, "Shutting down SysDB daemon "SDB_VERSION_STRING
 289                         SDB_VERSION_EXTRA" (pid %i)", (int)getpid());
 290         return 0;
 291 } /* main */
 292
 293 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 294