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

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004-2012 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   { "wait-for-root", no_argument, 0, 'W' },
  35   { "syslog", no_argument, 0, 's' },
  36   { 0, 0, 0, 0 }
  37 };
  38
  39 /* display usage message and terminate */
  40 static void attribute((noreturn)) help(void) {
  41   xprintf("Usage:\n"
  42           "  disorderd [OPTIONS]\n"
  43           "Options:\n"
  44           "  --help, -h               Display usage message\n"
  45           "  --version, -V            Display version number\n"
  46           "  --config PATH, -c PATH   Set configuration file\n"
  47           "  --debug, -d              Turn on debugging\n"
  48           "  --foreground, -f         Do not become a daemon\n"
  49           "  --syslog, -s             Log to syslog even with -f\n"
  50           "  --pidfile PATH, -P PATH  Leave a pidfile\n");
  51   xfclose(stdout);
  52   exit(0);
  53 }
  54
  55 /* signals ------------------------------------------------------------------ */
  56
  57 /* SIGHUP callback */
  58 static int handle_sighup(ev_source attribute((unused)) *ev_,
  59                          int attribute((unused)) sig,
  60                          void attribute((unused)) *u) {
  61   disorder_info("received SIGHUP");
  62   reconfigure(ev, RECONFIGURE_RELOADING);
  63   return 0;
  64 }
  65
  66 /* fatal signals */
  67
  68 static int handle_sigint(ev_source attribute((unused)) *ev_,
  69                          int attribute((unused)) sig,
  70                          void attribute((unused)) *u) {
  71   disorder_info("received SIGINT");
  72   quit(ev);
  73 }
  74
  75 static int handle_sigterm(ev_source attribute((unused)) *ev_,
  76                           int attribute((unused)) sig,
  77                           void attribute((unused)) *u) {
  78   disorder_info("received SIGTERM");
  79   quit(ev);
  80 }
  81
  82 /* periodic actions --------------------------------------------------------- */
  83
  84 /** @brief A job executed periodically by the server */
  85 struct periodic_data {
  86   /** @brief Callback to process job */
  87   void (*callback)(ev_source *);
  88
  89   /** @brief Period of job in seconds */
  90   int period;
  91 };
  92
  93 static int periodic_callback(ev_source *ev_,
  94                              const struct timeval attribute((unused)) *now,
  95                              void *u) {
  96   struct timeval w;
  97   struct periodic_data *const pd = u;
  98
  99   pd->callback(ev_);
 100   gettimeofday(&w, 0);
 101   w.tv_sec += pd->period;
 102   ev_timeout(ev, 0, &w, periodic_callback, pd);
 103   return 0;
 104 }
 105
 106 /** @brief Create a periodic action
 107  * @param ev_ Event loop
 108  * @param callback Callback function
 109  * @param period Interval between calls in seconds
 110  * @param immediate If true, call @p callback straight away
 111  */
 112 static void create_periodic(ev_source *ev_,
 113                             void (*callback)(ev_source *),
 114                             int period,
 115                             int immediate) {
 116   struct timeval w;
 117   struct periodic_data *const pd = xmalloc(sizeof *pd);
 118
 119   pd->callback = callback;
 120   pd->period = period;
 121   if(immediate)
 122     callback(ev_);
 123   gettimeofday(&w, 0);
 124   w.tv_sec += period;
 125   ev_timeout(ev_, 0, &w, periodic_callback, pd);
 126 }
 127
 128 static void periodic_rescan(ev_source *ev_) {
 129   trackdb_rescan(ev_, 1/*check*/, 0, 0);
 130 }
 131
 132 static void periodic_database_gc(ev_source attribute((unused)) *ev_) {
 133   trackdb_gc();
 134 }
 135
 136 static void periodic_volume_check(ev_source attribute((unused)) *ev_) {
 137   int l, r;
 138   char lb[32], rb[32];
 139
 140   if(api && api->get_volume) {
 141     api->get_volume(&l, &r);
 142     if(l != volume_left || r != volume_right) {
 143       volume_left = l;
 144       volume_right = r;
 145       snprintf(lb, sizeof lb, "%d", l);
 146       snprintf(rb, sizeof rb, "%d", r);
 147       eventlog("volume", lb, rb, (char *)0);
 148     }
 149   }
 150 }
 151
 152 static void periodic_play_check(ev_source *ev_) {
 153   play(ev_);
 154 }
 155
 156 static void periodic_add_random(ev_source *ev_) {
 157   add_random_track(ev_);
 158 }
 159
 160 /* We fix the path to include the bindir and sbindir we were installed into */
 161 static void fix_path(void) {
 162   char *path = getenv("PATH");
 163   static char *newpath;
 164   /* static or libgc collects it! */
 165
 166   if(!path)
 167     disorder_error(0, "PATH is not set at all!");
 168
 169   if(*finkbindir && strcmp(finkbindir, "/"))
 170     /* We appear to be a finkized mac; include fink on the path in case the
 171      * tools we need are there. */
 172     byte_xasprintf(&newpath, "PATH=%s:%s:%s:%s",
 173                    path, bindir, sbindir, finkbindir);
 174   else
 175     byte_xasprintf(&newpath, "PATH=%s:%s:%s", path, bindir, sbindir);
 176   putenv(newpath);
 177   disorder_info("%s", newpath);
 178 }
 179
 180 /* Used by test scripts to wait for things to get ready */
 181 static void wait_for_root(void) {
 182   const char *password;
 183
 184   while(!trackdb_readable()) {
 185     disorder_info("waiting for trackdb...");
 186     sleep(1);
 187   }
 188   trackdb_init(TRACKDB_NO_RECOVER|TRACKDB_NO_UPGRADE);
 189   for(;;) {
 190     trackdb_open(TRACKDB_READ_ONLY);
 191     password = trackdb_get_password("root");
 192     trackdb_close();
 193     if(password)
 194       break;
 195     disorder_info("waiting for root user to be created...");
 196     sleep(1);
 197   }
 198   trackdb_deinit(NULL);
 199 }
 200
 201 int main(int argc, char **argv) {
 202   int n, background = 1, logsyslog = 0, wfr = 0;
 203   const char *pidfile = 0;
 204   struct rlimit rl[1];
 205
 206   set_progname(argv);
 207   mem_init();
 208   if(!setlocale(LC_CTYPE, ""))
 209     disorder_fatal(errno, "error calling setlocale");
 210   /* garbage-collect PCRE's memory */
 211   regexp_setup();
 212   while((n = getopt_long(argc, argv, "hVc:dfP:NsW", options, 0)) >= 0) {
 213     switch(n) {
 214     case 'h': help();
 215     case 'V': version("disorderd");
 216     case 'c': configfile = optarg; break;
 217     case 'd': debugging = 1; break;
 218     case 'f': background = 0; break;
 219     case 'P': pidfile = optarg; break;
 220     case 's': logsyslog = 1; break;
 221     case 'w': wideopen = 1; break;
 222     case 'W': wfr = 1; break;
 223     default: disorder_fatal(0, "invalid option");
 224     }
 225   }
 226   if(wfr) {
 227     if(config_read(1,  NULL))
 228       disorder_fatal(0, "cannot read configuration");
 229     wait_for_root();
 230     return 0;
 231   }
 232   /* go into background if necessary */
 233   if(background)
 234     daemonize(progname, LOG_DAEMON, pidfile);
 235   else if(logsyslog) {
 236     /* If we're running under some kind of daemon supervisor then we may want
 237      * to log to syslog but not to go into background */
 238     openlog(progname, LOG_PID, LOG_DAEMON);
 239     log_default = &log_syslog;
 240   }
 241   disorder_info("version "VERSION" process ID %lu", (unsigned long)getpid());
 242   fix_path();
 243   srand(xtime(0));                      /* don't start the same every time */
 244   /* gcrypt initialization */
 245   if(!gcry_check_version(NULL))
 246     disorder_fatal(0, "gcry_check_version failed");
 247   gcry_control(GCRYCTL_INIT_SECMEM, 1);
 248   gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
 249   /* make sure we can't have more than FD_SETSIZE files open (event.c does
 250    * check but this provides an additional line of defence) */
 251   if(getrlimit(RLIMIT_NOFILE, rl) < 0)
 252     disorder_fatal(errno, "getrlimit RLIMIT_NOFILE");
 253   if(rl->rlim_cur > FD_SETSIZE) {
 254     rl->rlim_cur = FD_SETSIZE;
 255     if(setrlimit(RLIMIT_NOFILE, rl) < 0)
 256       disorder_fatal(errno, "setrlimit to reduce RLIMIT_NOFILE to %lu",
 257                      (unsigned long)rl->rlim_cur);
 258     disorder_info("set RLIM_NOFILE to %lu", (unsigned long)rl->rlim_cur);
 259   } else
 260     disorder_info("RLIM_NOFILE is %lu", (unsigned long)rl->rlim_cur);
 261   /* create event loop */
 262   ev = ev_new();
 263   if(ev_child_setup(ev)) disorder_fatal(0, "ev_child_setup failed");
 264   /* read config */
 265   config_uaudio_apis = uaudio_apis;
 266   if(config_read(1,  NULL))
 267     disorder_fatal(0, "cannot read configuration");
 268   /* make sure the home directory exists and has suitable permissions */
 269   make_home();
 270   /* Start the speaker process (as root! - so it can choose its nice value) */
 271   speaker_setup(ev);
 272   /* set server nice value _after_ starting the speaker, so that they
 273    * are independently niceable */
 274   xnice(config->nice_server);
 275   /* change user */
 276   become_mortal();
 277   /* make sure we're not root, whatever the config says */
 278   if(getuid() == 0 || geteuid() == 0)
 279     disorder_fatal(0, "do not run as root");
 280   /* open a lockfile - we only want one copy of the server to run at once. */
 281   if(1) {
 282     const char *lockfile;
 283     int lockfd;
 284     struct flock lock;
 285
 286     lockfile = config_get_file("lock");
 287     if((lockfd = open(lockfile, O_RDWR|O_CREAT, 0600)) < 0)
 288       disorder_fatal(errno, "error opening %s", lockfile);
 289     cloexec(lockfd);
 290     memset(&lock, 0, sizeof lock);
 291     lock.l_type = F_WRLCK;
 292     lock.l_whence = SEEK_SET;
 293     if(fcntl(lockfd, F_SETLK, &lock) < 0)
 294       disorder_fatal(errno, "error locking %s", lockfile);
 295   }
 296   /* initialize database environment */
 297   trackdb_init(TRACKDB_NORMAL_RECOVER|TRACKDB_MAY_CREATE);
 298   trackdb_master(ev);
 299   /* install new config; don't create socket */
 300   if(reconfigure(ev, RECONFIGURE_FIRST))
 301     disorder_fatal(0, "failed to read configuration");
 302   /* Open the database */
 303   trackdb_open(TRACKDB_CAN_UPGRADE);
 304   /* load the queue and recently-played list */
 305   queue_read();
 306   recent_read();
 307   /* Arrange timeouts for schedule actions */
 308   schedule_init(ev);
 309   /* create a root login */
 310   trackdb_create_root();
 311   /* create sockets */
 312   reset_sockets(ev);
 313   /* check for change to database parameters */
 314   dbparams_check();
 315   /* re-read config if we receive a SIGHUP */
 316   if(ev_signal(ev, SIGHUP, handle_sighup, 0))
 317     disorder_fatal(0, "ev_signal failed");
 318   /* exit on SIGINT/SIGTERM */
 319   if(ev_signal(ev, SIGINT, handle_sigint, 0))
 320     disorder_fatal(0, "ev_signal failed");
 321   if(ev_signal(ev, SIGTERM, handle_sigterm, 0))
 322     disorder_fatal(0, "ev_signal failed");
 323   /* ignore SIGPIPE */
 324   signal(SIGPIPE, SIG_IGN);
 325   /* Rescan immediately and then daily */
 326   create_periodic(ev, periodic_rescan, 86400, 1/*immediate*/);
 327   /* Tidy up the database once a minute */
 328   create_periodic(ev, periodic_database_gc, 60, 0);
 329   /* Check the volume immediately and then once a minute */
 330   create_periodic(ev, periodic_volume_check, 60, 1);
 331   /* Check for a playable track once a second */
 332   create_periodic(ev, periodic_play_check, 1, 0);
 333   /* Try adding a random track immediately and once every two seconds */
 334   create_periodic(ev, periodic_add_random, 2, 1);
 335   /* Issue a rescan when devices are mounted or unmouted */
 336   create_periodic(ev, periodic_mount_check, MOUNT_CHECK_INTERVAL, 1);
 337   /* enter the event loop */
 338   n = ev_run(ev);
 339   /* if we exit the event loop, something must have gone wrong */
 340   disorder_fatal(errno, "ev_run returned %d", n);
 341 }
 342
 343 /*
 344 Local Variables:
 345 c-basic-offset:2
 346 comment-column:40
 347 fill-column:79
 348 End:
 349 */