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

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2004, 2005, 2006, 2007 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 2 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, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * 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, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20
  21 #include <config.h>
  22 #include "types.h"
  23
  24 #include <stdio.h>
  25 #include <getopt.h>
  26 #include <pwd.h>
  27 #include <grp.h>
  28 #include <sys/types.h>
  29 #include <errno.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33 #include <signal.h>
  34 #include <sys/socket.h>
  35 #include <time.h>
  36 #include <locale.h>
  37 #include <syslog.h>
  38 #include <sys/time.h>
  39 #include <pcre.h>
  40 #include <fcntl.h>
  41
  42 #include "daemonize.h"
  43 #include "event.h"
  44 #include "log.h"
  45 #include "configuration.h"
  46 #include "trackdb.h"
  47 #include "queue.h"
  48 #include "mem.h"
  49 #include "play.h"
  50 #include "server.h"
  51 #include "state.h"
  52 #include "syscalls.h"
  53 #include "defs.h"
  54 #include "user.h"
  55 #include "mixer.h"
  56 #include "eventlog.h"
  57 #include "printf.h"
  58 #include "setup.h"
  59
  60 static ev_source *ev;
  61
  62 static void rescan_after(long offset);
  63 static void dbgc_after(long offset);
  64 static void volumecheck_after(long offset);
  65
  66 static const struct option options[] = {
  67   { "help", no_argument, 0, 'h' },
  68   { "version", no_argument, 0, 'V' },
  69   { "config", required_argument, 0, 'c' },
  70   { "debug", no_argument, 0, 'd' },
  71   { "foreground", no_argument, 0, 'f' },
  72   { "log", required_argument, 0, 'l' },
  73   { "pidfile", required_argument, 0, 'P' },
  74   { "no-initial-rescan", no_argument, 0, 'N' },
  75   { "wide-open", no_argument, 0, 'w' },
  76   { "syslog", no_argument, 0, 's' },
  77   { 0, 0, 0, 0 }
  78 };
  79
  80 /* display usage message and terminate */
  81 static void help(void) {
  82   xprintf("Usage:\n"
  83           "  disorderd [OPTIONS]\n"
  84           "Options:\n"
  85           "  --help, -h               Display usage message\n"
  86           "  --version, -V            Display version number\n"
  87           "  --config PATH, -c PATH   Set configuration file\n"
  88           "  --debug, -d              Turn on debugging\n"
  89           "  --foreground, -f         Do not become a daemon\n"
  90           "  --syslog, -s             Log to syslog even with -f\n"
  91           "  --pidfile PATH, -P PATH  Leave a pidfile\n");
  92   xfclose(stdout);
  93   exit(0);
  94 }
  95
  96 /* display version number and terminate */
  97 static void version(void) {
  98   xprintf("disorderd version %s\n", disorder_version_string);
  99   xfclose(stdout);
 100   exit(0);
 101 }
 102
 103 /* SIGHUP callback */
 104 static int handle_sighup(ev_source attribute((unused)) *ev_,
 105                          int attribute((unused)) sig,
 106                          void attribute((unused)) *u) {
 107   info("received SIGHUP");
 108   reconfigure(ev, 1);
 109   return 0;
 110 }
 111
 112 /* fatal signals */
 113
 114 static int handle_sigint(ev_source attribute((unused)) *ev_,
 115                          int attribute((unused)) sig,
 116                          void attribute((unused)) *u) {
 117   info("received SIGINT");
 118   quit(ev);
 119 }
 120
 121 static int handle_sigterm(ev_source attribute((unused)) *ev_,
 122                           int attribute((unused)) sig,
 123                           void attribute((unused)) *u) {
 124   info("received SIGTERM");
 125   quit(ev);
 126 }
 127
 128 static int rescan_again(ev_source *ev_,
 129                         const struct timeval attribute((unused)) *now,
 130                         void attribute((unused)) *u) {
 131   trackdb_rescan(ev_);
 132   rescan_after(86400);
 133   return 0;
 134 }
 135
 136 static void rescan_after(long offset) {
 137   struct timeval w;
 138
 139   gettimeofday(&w, 0);
 140   w.tv_sec += offset;
 141   ev_timeout(ev, 0, &w, rescan_again, 0);
 142 }
 143
 144 static int dbgc_again(ev_source attribute((unused)) *ev_,
 145                       const struct timeval attribute((unused)) *now,
 146                       void attribute((unused)) *u) {
 147   trackdb_gc();
 148   dbgc_after(60);
 149   return 0;
 150 }
 151
 152 static void dbgc_after(long offset) {
 153   struct timeval w;
 154
 155   gettimeofday(&w, 0);
 156   w.tv_sec += offset;
 157   ev_timeout(ev, 0, &w, dbgc_again, 0);
 158 }
 159
 160 static int volumecheck_again(ev_source attribute((unused)) *ev_,
 161                              const struct timeval attribute((unused)) *now,
 162                              void attribute((unused)) *u) {
 163   int l, r;
 164   char lb[32], rb[32];
 165
 166   if(!mixer_control(&l, &r, 0)) {
 167     if(l != volume_left || r != volume_right) {
 168       volume_left = l;
 169       volume_right = r;
 170       snprintf(lb, sizeof lb, "%d", l);
 171       snprintf(rb, sizeof rb, "%d", r);
 172       eventlog("volume", lb, rb, (char *)0);
 173     }
 174   }
 175   volumecheck_after(60);
 176   return 0;
 177 }
 178
 179 static void volumecheck_after(long offset) {
 180   struct timeval w;
 181
 182   gettimeofday(&w, 0);
 183   w.tv_sec += offset;
 184   ev_timeout(ev, 0, &w, volumecheck_again, 0);
 185 }
 186
 187 /* We fix the path to include the bindir and sbindir we were installed into */
 188 static void fix_path(void) {
 189   char *path = getenv("PATH");
 190   static char *newpath;
 191   /* static or libgc collects it! */
 192
 193   if(!path)
 194     error(0, "PATH is not set at all!");
 195
 196   if(*finkbindir && strcmp(finkbindir, "/"))
 197     /* We appear to be a finkized mac; include fink on the path in case the
 198      * tools we need are there. */
 199     byte_xasprintf(&newpath, "PATH=%s:%s:%s:%s",
 200                    path, bindir, sbindir, finkbindir);
 201   else
 202     byte_xasprintf(&newpath, "PATH=%s:%s:%s", path, bindir, sbindir);
 203   putenv(newpath);
 204   info("%s", newpath);
 205 }
 206
 207 int main(int argc, char **argv) {
 208   int n, background = 1, logsyslog = 0;
 209   const char *pidfile = 0;
 210   int initial_rescan = 1;
 211
 212   set_progname(argv);
 213   mem_init();
 214   if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale");
 215   /* garbage-collect PCRE's memory */
 216   pcre_malloc = xmalloc;
 217   pcre_free = xfree;
 218   while((n = getopt_long(argc, argv, "hVc:dfP:Ns", options, 0)) >= 0) {
 219     switch(n) {
 220     case 'h': help();
 221     case 'V': version();
 222     case 'c': configfile = optarg; break;
 223     case 'd': debugging = 1; break;
 224     case 'f': background = 0; break;
 225     case 'P': pidfile = optarg; break;
 226     case 'N': initial_rescan = 0; break;
 227     case 's': logsyslog = 1; break;
 228     case 'w': wideopen = 1; break;
 229     default: fatal(0, "invalid option");
 230     }
 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   info("process ID %lu", (unsigned long)getpid());
 242   fix_path();
 243   srand(time(0));                       /* don't start the same every time */
 244   /* create event loop */
 245   ev = ev_new();
 246   if(ev_child_setup(ev)) fatal(0, "ev_child_setup failed");
 247   /* read config */
 248   if(config_read(1))
 249     fatal(0, "cannot read configuration");
 250   /* make sure the home directory exists and has suitable permissions */
 251   make_home();
 252   /* create the default login */
 253   make_root_login();
 254   /* Start the speaker process (as root! - so it can choose its nice value) */
 255   speaker_setup(ev);
 256   /* set server nice value _after_ starting the speaker, so that they
 257    * are independently niceable */
 258   xnice(config->nice_server);
 259   /* change user */
 260   become_mortal();
 261   /* make sure we're not root, whatever the config says */
 262   if(getuid() == 0 || geteuid() == 0) fatal(0, "do not run as root");
 263   /* open a lockfile - we only want one copy of the server to run at once. */
 264   if(config->lock) {
 265     const char *lockfile;
 266     int lockfd;
 267     struct flock lock;
 268
 269     lockfile = config_get_file("lock");
 270     if((lockfd = open(lockfile, O_RDWR|O_CREAT, 0600)) < 0)
 271       fatal(errno, "error opening %s", lockfile);
 272     cloexec(lockfd);
 273     memset(&lock, 0, sizeof lock);
 274     lock.l_type = F_WRLCK;
 275     lock.l_whence = SEEK_SET;
 276     if(fcntl(lockfd, F_SETLK, &lock) < 0)
 277       fatal(errno, "error locking %s", lockfile);
 278   }
 279   /* initialize database environment */
 280   trackdb_init(TRACKDB_NORMAL_RECOVER);
 281   trackdb_master(ev);
 282   /* install new config */
 283   reconfigure(ev, 0);
 284   /* re-read config if we receive a SIGHUP */
 285   if(ev_signal(ev, SIGHUP, handle_sighup, 0)) fatal(0, "ev_signal failed");
 286   /* exit on SIGINT/SIGTERM */
 287   if(ev_signal(ev, SIGINT, handle_sigint, 0)) fatal(0, "ev_signal failed");
 288   if(ev_signal(ev, SIGTERM, handle_sigterm, 0)) fatal(0, "ev_signal failed");
 289   /* ignore SIGPIPE */
 290   signal(SIGPIPE, SIG_IGN);
 291   /* start a rescan straight away */
 292   if(initial_rescan)
 293     trackdb_rescan(ev);
 294   rescan_after(86400);
 295   /* periodically tidy up the database */
 296   dbgc_after(60);
 297   /* periodically check the volume */
 298   volumecheck_again(0, 0, 0);
 299   /* set initial state */
 300   add_random_track();
 301   play(ev);
 302   /* enter the event loop */
 303   n = ev_run(ev);
 304   /* if we exit the event loop, something must have gone wrong */
 305   fatal(errno, "ev_run returned %d", n);
 306 }
 307
 308 /*
 309 Local Variables:
 310 c-basic-offset:2
 311 comment-column:40
 312 fill-column:79
 313 End:
 314 */