mdw@git.distorted.org.uk Git - disorder/blob - server/disorderd.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004-2009 Richard Kettlewell
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 /** @file server/disorderd.c
  19  * @brief Main DisOrder server
  20  */
  21 #include "disorder-server.h"
  22
  23 static ev_source *ev;
  24
  25 static const struct option options[] = {
  26   { "help", no_argument, 0, 'h' },
  27   { "version", no_argument, 0, 'V' },
  28   { "config", required_argument, 0, 'c' },
  29   { "debug", no_argument, 0, 'd' },
  30   { "foreground", no_argument, 0, 'f' },
  31   { "log", required_argument, 0, 'l' },
  32   { "pidfile", required_argument, 0, 'P' },
  33   { "wide-open", no_argument, 0, 'w' },
  34   { "syslog", no_argument, 0, 's' },
  35   { 0, 0, 0, 0 }
  36 };
  37
  38 /* display usage message and terminate */
  39 static void help(void) {
  40   xprintf("Usage:\n"
  41           "  disorderd [OPTIONS]\n"
  42           "Options:\n"
  43           "  --help, -h               Display usage message\n"
  44           "  --version, -V            Display version number\n"
  45           "  --config PATH, -c PATH   Set configuration file\n"
  46           "  --debug, -d              Turn on debugging\n"
  47           "  --foreground, -f         Do not become a daemon\n"
  48           "  --syslog, -s             Log to syslog even with -f\n"
  49           "  --pidfile PATH, -P PATH  Leave a pidfile\n");
  50   xfclose(stdout);
  51   exit(0);
  52 }
  53
  54 /* signals ------------------------------------------------------------------ */
  55
  56 /* SIGHUP callback */
  57 static int handle_sighup(ev_source attribute((unused)) *ev_,
  58                          int attribute((unused)) sig,
  59                          void attribute((unused)) *u) {
  60   disorder_info("received SIGHUP");
  61   reconfigure(ev, RECONFIGURE_RELOADING);
  62   return 0;
  63 }
  64
  65 /* fatal signals */
  66
  67 static int handle_sigint(ev_source attribute((unused)) *ev_,
  68                          int attribute((unused)) sig,
  69                          void attribute((unused)) *u) {
  70   disorder_info("received SIGINT");
  71   quit(ev);
  72 }
  73
  74 static int handle_sigterm(ev_source attribute((unused)) *ev_,
  75                           int attribute((unused)) sig,
  76                           void attribute((unused)) *u) {
  77   disorder_info("received SIGTERM");
  78   quit(ev);
  79 }
  80
  81 /* periodic actions --------------------------------------------------------- */
  82
  83 /** @brief A job executed periodically by the server */
  84 struct periodic_data {
  85   /** @brief Callback to process job */
  86   void (*callback)(ev_source *);
  87
  88   /** @brief Period of job in seconds */
  89   int period;
  90 };
  91
  92 static int periodic_callback(ev_source *ev_,
  93                              const struct timeval attribute((unused)) *now,
  94                              void *u) {
  95   struct timeval w;
  96   struct periodic_data *const pd = u;
  97
  98   pd->callback(ev_);
  99   gettimeofday(&w, 0);
 100   w.tv_sec += pd->period;
 101   ev_timeout(ev, 0, &w, periodic_callback, pd);
 102   return 0;
 103 }
 104
 105 /** @brief Create a periodic action
 106  * @param ev_ Event loop
 107  * @param callback Callback function
 108  * @param period Interval between calls in seconds
 109  * @param immediate If true, call @p callback straight away
 110  */
 111 static void create_periodic(ev_source *ev_,
 112                             void (*callback)(ev_source *),
 113                             int period,
 114                             int immediate) {
 115   struct timeval w;
 116   struct periodic_data *const pd = xmalloc(sizeof *pd);
 117
 118   pd->callback = callback;
 119   pd->period = period;
 120   if(immediate)
 121     callback(ev_);
 122   gettimeofday(&w, 0);
 123   w.tv_sec += period;
 124   ev_timeout(ev_, 0, &w, periodic_callback, pd);
 125 }
 126
 127 static void periodic_rescan(ev_source *ev_) {
 128   trackdb_rescan(ev_, 1/*check*/, 0, 0);
 129 }
 130
 131 static void periodic_database_gc(ev_source attribute((unused)) *ev_) {
 132   trackdb_gc();
 133 }
 134
 135 static void periodic_volume_check(ev_source attribute((unused)) *ev_) {
 136   int l, r;
 137   char lb[32], rb[32];
 138
 139   if(api && api->get_volume) {
 140     api->get_volume(&l, &r);
 141     if(l != volume_left || r != volume_right) {
 142       volume_left = l;
 143       volume_right = r;
 144       snprintf(lb, sizeof lb, "%d", l);
 145       snprintf(rb, sizeof rb, "%d", r);
 146       eventlog("volume", lb, rb, (char *)0);
 147     }
 148   }
 149 }
 150
 151 static void periodic_play_check(ev_source *ev_) {
 152   play(ev_);
 153 }
 154
 155 static void periodic_add_random(ev_source *ev_) {
 156   add_random_track(ev_);
 157 }
 158
 159 /* We fix the path to include the bindir and sbindir we were installed into */
 160 static void fix_path(void) {
 161   char *path = getenv("PATH");
 162   static char *newpath;
 163   /* static or libgc collects it! */
 164
 165   if(!path)
 166     disorder_error(0, "PATH is not set at all!");
 167
 168   if(*finkbindir && strcmp(finkbindir, "/"))
 169     /* We appear to be a finkized mac; include fink on the path in case the
 170      * tools we need are there. */
 171     byte_xasprintf(&newpath, "PATH=%s:%s:%s:%s",
 172                    path, bindir, sbindir, finkbindir);
 173   else
 174     byte_xasprintf(&newpath, "PATH=%s:%s:%s", path, bindir, sbindir);
 175   putenv(newpath);
 176   disorder_info("%s", newpath);
 177 }
 178
 179 int main(int argc, char **argv) {
 180   int n, background = 1, logsyslog = 0;
 181   const char *pidfile = 0;
 182   struct rlimit rl[1];
 183
 184   set_progname(argv);
 185   mem_init();
 186   if(!setlocale(LC_CTYPE, ""))
 187     disorder_fatal(errno, "error calling setlocale");
 188   /* garbage-collect PCRE's memory */
 189   pcre_malloc = xmalloc;
 190   pcre_free = xfree;
 191   while((n = getopt_long(argc, argv, "hVc:dfP:Ns", options, 0)) >= 0) {
 192     switch(n) {
 193     case 'h': help();
 194     case 'V': version("disorderd");
 195     case 'c': configfile = optarg; break;
 196     case 'd': debugging = 1; break;
 197     case 'f': background = 0; break;
 198     case 'P': pidfile = optarg; break;
 199     case 's': logsyslog = 1; break;
 200     case 'w': wideopen = 1; break;
 201     default: disorder_fatal(0, "invalid option");
 202     }
 203   }
 204   /* go into background if necessary */
 205   if(background)
 206     daemonize(progname, LOG_DAEMON, pidfile);
 207   else if(logsyslog) {
 208     /* If we're running under some kind of daemon supervisor then we may want
 209      * to log to syslog but not to go into background */
 210     openlog(progname, LOG_PID, LOG_DAEMON);
 211     log_default = &log_syslog;
 212   }
 213   disorder_info("process ID %lu", (unsigned long)getpid());
 214   fix_path();
 215   srand(xtime(0));                      /* don't start the same every time */
 216   /* gcrypt initialization */
 217   if(!gcry_check_version(NULL))
 218     disorder_fatal(0, "gcry_check_version failed");
 219   gcry_control(GCRYCTL_INIT_SECMEM, 1);
 220   gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
 221   /* make sure we can't have more than FD_SETSIZE files open (event.c does
 222    * check but this provides an additional line of defence) */
 223   if(getrlimit(RLIMIT_NOFILE, rl) < 0)
 224     disorder_fatal(errno, "getrlimit RLIMIT_NOFILE");
 225   if(rl->rlim_cur > FD_SETSIZE) {
 226     rl->rlim_cur = FD_SETSIZE;
 227     if(setrlimit(RLIMIT_NOFILE, rl) < 0)
 228       disorder_fatal(errno, "setrlimit to reduce RLIMIT_NOFILE to %lu",
 229                      (unsigned long)rl->rlim_cur);
 230     disorder_info("set RLIM_NOFILE to %lu", (unsigned long)rl->rlim_cur);
 231   } else
 232     disorder_info("RLIM_NOFILE is %lu", (unsigned long)rl->rlim_cur);
 233   /* create event loop */
 234   ev = ev_new();
 235   if(ev_child_setup(ev)) disorder_fatal(0, "ev_child_setup failed");
 236   /* read config */
 237   config_uaudio_apis = uaudio_apis;
 238   if(config_read(1,  NULL))
 239     disorder_fatal(0, "cannot read configuration");
 240   /* make sure the home directory exists and has suitable permissions */
 241   make_home();
 242   /* Start the speaker process (as root! - so it can choose its nice value) */
 243   speaker_setup(ev);
 244   /* set server nice value _after_ starting the speaker, so that they
 245    * are independently niceable */
 246   xnice(config->nice_server);
 247   /* change user */
 248   become_mortal();
 249   /* make sure we're not root, whatever the config says */
 250   if(getuid() == 0 || geteuid() == 0)
 251     disorder_fatal(0, "do not run as root");
 252   /* open a lockfile - we only want one copy of the server to run at once. */
 253   if(1) {
 254     const char *lockfile;
 255     int lockfd;
 256     struct flock lock;
 257
 258     lockfile = config_get_file("lock");
 259     if((lockfd = open(lockfile, O_RDWR|O_CREAT, 0600)) < 0)
 260       disorder_fatal(errno, "error opening %s", lockfile);
 261     cloexec(lockfd);
 262     memset(&lock, 0, sizeof lock);
 263     lock.l_type = F_WRLCK;
 264     lock.l_whence = SEEK_SET;
 265     if(fcntl(lockfd, F_SETLK, &lock) < 0)
 266       disorder_fatal(errno, "error locking %s", lockfile);
 267   }
 268   /* initialize database environment */
 269   trackdb_init(TRACKDB_NORMAL_RECOVER|TRACKDB_MAY_CREATE);
 270   trackdb_master(ev);
 271   /* install new config; don't create socket */
 272   if(reconfigure(ev, RECONFIGURE_FIRST))
 273     disorder_fatal(0, "failed to read configuration");
 274   /* Open the database */
 275   trackdb_open(TRACKDB_CAN_UPGRADE);
 276   /* load the queue and recently-played list */
 277   queue_read();
 278   recent_read();
 279   /* Arrange timeouts for schedule actions */
 280   schedule_init(ev);
 281   /* pull in old users */
 282   trackdb_old_users();
 283   /* create a root login */
 284   trackdb_create_root();
 285   /* create sockets */
 286   reset_sockets(ev);
 287   /* check for change to database parameters */
 288   dbparams_check();
 289   /* re-read config if we receive a SIGHUP */
 290   if(ev_signal(ev, SIGHUP, handle_sighup, 0))
 291     disorder_fatal(0, "ev_signal failed");
 292   /* exit on SIGINT/SIGTERM */
 293   if(ev_signal(ev, SIGINT, handle_sigint, 0))
 294     disorder_fatal(0, "ev_signal failed");
 295   if(ev_signal(ev, SIGTERM, handle_sigterm, 0))
 296     disorder_fatal(0, "ev_signal failed");
 297   /* ignore SIGPIPE */
 298   signal(SIGPIPE, SIG_IGN);
 299   /* Rescan immediately and then daily */
 300   create_periodic(ev, periodic_rescan, 86400, 1/*immediate*/);
 301   /* Tidy up the database once a minute */
 302   create_periodic(ev, periodic_database_gc, 60, 0);
 303   /* Check the volume immediately and then once a minute */
 304   create_periodic(ev, periodic_volume_check, 60, 1);
 305   /* Check for a playable track once a second */
 306   create_periodic(ev, periodic_play_check, 1, 0);
 307   /* Try adding a random track immediately and once every two seconds */
 308   create_periodic(ev, periodic_add_random, 2, 1);
 309   /* Issue a rescan when devices are mounted or unmouted */
 310   create_periodic(ev, periodic_mount_check, MOUNT_CHECK_INTERVAL, 1);
 311   /* enter the event loop */
 312   n = ev_run(ev);
 313   /* if we exit the event loop, something must have gone wrong */
 314   disorder_fatal(errno, "ev_run returned %d", n);
 315 }
 316
 317 /*
 318 Local Variables:
 319 c-basic-offset:2
 320 comment-column:40
 321 fill-column:79
 322 End:
 323 */