code.delx.au - pulseaudio/blob - polyp/main.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31 #include <signal.h>
  32 #include <stddef.h>
  33 #include <assert.h>
  34 #include <ltdl.h>
  35 #include <memblock.h>
  36 #include <limits.h>
  37 #include <fcntl.h>
  38 #include <sys/ioctl.h>
  39
  40 #ifdef HAVE_LIBWRAP
  41 #include <syslog.h>
  42 #include <tcpd.h>
  43 #endif
  44
  45 #include "core.h"
  46 #include "mainloop.h"
  47 #include "module.h"
  48 #include "mainloop-signal.h"
  49 #include "cmdline.h"
  50 #include "cli-command.h"
  51 #include "util.h"
  52 #include "sioman.h"
  53 #include "xmalloc.h"
  54 #include "cpulimit.h"
  55 #include "log.h"
  56 #include "daemon-conf.h"
  57 #include "dumpmodules.h"
  58 #include "caps.h"
  59 #include "cli-text.h"
  60 #include "pid.h"
  61
  62 #ifdef HAVE_LIBWRAP
  63 /* Only one instance of these variables */
  64 int allow_severity = LOG_INFO;
  65 int deny_severity = LOG_WARNING;
  66 #endif
  67
  68 static void signal_callback(struct pa_mainloop_api*m, struct pa_signal_event *e, int sig, void *userdata) {
  69     pa_log_info(__FILE__": Got signal %s.\n", pa_strsignal(sig));
  70
  71     switch (sig) {
  72         case SIGUSR1:
  73             pa_module_load(userdata, "module-cli", NULL);
  74             return;
  75
  76         case SIGUSR2:
  77             pa_module_load(userdata, "module-cli-protocol-unix", NULL);
  78             return;
  79
  80         case SIGHUP: {
  81             int i;
  82
  83             for (i = 0;; i++) {
  84                 char *c;
  85                 switch (i) {
  86                     case 0:
  87                         c = pa_sink_list_to_string(userdata);
  88                         break;
  89                     case 1:
  90                         c = pa_source_list_to_string(userdata);
  91                         break;
  92                     case 2:
  93                         c = pa_sink_input_list_to_string(userdata);
  94                         break;
  95                     case 3:
  96                         c = pa_source_output_list_to_string(userdata);
  97                         break;
  98                     case 4:
  99                         c = pa_client_list_to_string(userdata);
 100                         break;
 101                     case 5:
 102                         c = pa_module_list_to_string(userdata);
 103                         break;
 104                     case 6:
 105                         c = pa_scache_list_to_string(userdata);
 106                         break;
 107                     case 7:
 108                         c = pa_autoload_list_to_string(userdata);
 109                         break;
 110                     default:
 111                         return;
 112                 }
 113                 pa_log_notice(c);
 114                 pa_xfree(c);
 115             }
 116
 117             return;
 118         }
 119
 120         case SIGINT:
 121         case SIGTERM:
 122         default:
 123             pa_log_info(__FILE__": Exiting.\n");
 124             m->quit(m, 1);
 125             return;
 126     }
 127 }
 128
 129 static void close_pipe(int p[2]) {
 130     if (p[0] != -1)
 131         close(p[0]);
 132     if (p[1] != -1)
 133         close(p[1]);
 134     p[0] = p[1] = -1;
 135 }
 136
 137 int main(int argc, char *argv[]) {
 138     struct pa_core *c;
 139     struct pa_strbuf *buf = NULL;
 140     struct pa_daemon_conf *conf;
 141     struct pa_mainloop *mainloop;
 142
 143     char *s;
 144     int r, retval = 1, d = 0;
 145     int daemon_pipe[2] = { -1, -1 };
 146     gid_t gid = (gid_t) -1;
 147     int suid_root;
 148     int valid_pid_file = 0;
 149
 150     pa_limit_caps();
 151
 152     suid_root = getuid() != 0 && geteuid() == 0;
 153
 154     if (suid_root && (pa_uid_in_group("realtime", &gid) <= 0 || gid >= 1000)) {
 155         pa_log_warn(__FILE__": WARNING: called SUID root, but not in group 'realtime'.\n");
 156         pa_drop_root();
 157     }
 158
 159     LTDL_SET_PRELOADED_SYMBOLS();
 160
 161     r = lt_dlinit();
 162     assert(r == 0);
 163
 164     pa_log_set_ident("polypaudio");
 165
 166     conf = pa_daemon_conf_new();
 167
 168     if (pa_daemon_conf_load(conf, NULL) < 0)
 169         goto finish;
 170
 171     if (pa_daemon_conf_env(conf) < 0)
 172         goto finish;
 173
 174     if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
 175         pa_log(__FILE__": failed to parse command line.\n");
 176         goto finish;
 177     }
 178
 179     pa_log_set_maximal_level(conf->log_level);
 180     pa_log_set_target(conf->auto_log_target ? PA_LOG_STDERR : conf->log_target, NULL);
 181
 182     if (conf->high_priority && conf->cmd == PA_CMD_DAEMON)
 183         pa_raise_priority();
 184
 185     pa_drop_caps();
 186
 187     if (suid_root)
 188         pa_drop_root();
 189
 190     if (conf->dl_search_path)
 191         lt_dlsetsearchpath(conf->dl_search_path);
 192
 193     switch (conf->cmd) {
 194         case PA_CMD_DUMP_MODULES:
 195             pa_dump_modules(conf, argc-d, argv+d);
 196             retval = 0;
 197             goto finish;
 198
 199         case PA_CMD_DUMP_CONF: {
 200             char *s = pa_daemon_conf_dump(conf);
 201             fputs(s, stdout);
 202             pa_xfree(s);
 203             retval = 0;
 204             goto finish;
 205         }
 206
 207         case PA_CMD_HELP :
 208             pa_cmdline_help(argv[0]);
 209             retval = 0;
 210             goto finish;
 211
 212         case PA_CMD_VERSION :
 213             printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
 214             retval = 0;
 215             goto finish;
 216
 217         case PA_CMD_CHECK: {
 218             pid_t pid;
 219
 220             if (pa_pid_file_check_running(&pid) < 0) {
 221                 pa_log_info(__FILE__": daemon not running\n");
 222             } else {
 223                 pa_log_info(__FILE__": daemon running as PID %u\n", pid);
 224                 retval = 0;
 225             }
 226
 227             goto finish;
 228
 229         }
 230         case PA_CMD_KILL:
 231
 232             if (pa_pid_file_kill(SIGINT, NULL) < 0)
 233                 pa_log(__FILE__": failed to kill daemon.\n");
 234             else
 235                 retval = 0;
 236
 237             goto finish;
 238
 239         default:
 240             assert(conf->cmd == PA_CMD_DAEMON);
 241     }
 242
 243     if (conf->daemonize) {
 244         pid_t child;
 245         int tty_fd;
 246
 247         if (pa_stdio_acquire() < 0) {
 248             pa_log(__FILE__": failed to acquire stdio.\n");
 249             goto finish;
 250         }
 251
 252         if (pipe(daemon_pipe) < 0) {
 253             pa_log(__FILE__": failed to create pipe.\n");
 254             goto finish;
 255         }
 256
 257         if ((child = fork()) < 0) {
 258             pa_log(__FILE__": fork() failed: %s\n", strerror(errno));
 259             goto finish;
 260         }
 261
 262         if (child != 0) {
 263             /* Father */
 264
 265             close(daemon_pipe[1]);
 266             daemon_pipe[1] = -1;
 267
 268             if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval)) != sizeof(retval)) {
 269                 pa_log(__FILE__": read() failed: %s\n", strerror(errno));
 270                 retval = 1;
 271             }
 272
 273             if (retval)
 274                 pa_log(__FILE__": daemon startup failed.\n");
 275             else
 276                 pa_log_info(__FILE__": daemon startup successful.\n");
 277
 278             goto finish;
 279         }
 280
 281         close(daemon_pipe[0]);
 282         daemon_pipe[0] = -1;
 283
 284         if (conf->auto_log_target)
 285             pa_log_set_target(PA_LOG_SYSLOG, NULL);
 286
 287         setsid();
 288         setpgid(0,0);
 289
 290         close(0);
 291         close(1);
 292         close(2);
 293
 294         open("/dev/null", O_RDONLY);
 295         open("/dev/null", O_WRONLY);
 296         open("/dev/null", O_WRONLY);
 297
 298         signal(SIGTTOU, SIG_IGN);
 299         signal(SIGTTIN, SIG_IGN);
 300         signal(SIGTSTP, SIG_IGN);
 301
 302         if ((tty_fd = open("/dev/tty", O_RDWR)) >= 0) {
 303             ioctl(tty_fd, TIOCNOTTY, (char*) 0);
 304             close(tty_fd);
 305         }
 306     }
 307
 308     chdir("/");
 309
 310     if (conf->use_pid_file) {
 311         if (pa_pid_file_create() < 0) {
 312             if (conf->daemonize)
 313                 pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 314             goto finish;
 315         }
 316
 317         valid_pid_file = 1;
 318     }
 319
 320     mainloop = pa_mainloop_new();
 321     assert(mainloop);
 322
 323     r = pa_signal_init(pa_mainloop_get_api(mainloop));
 324     assert(r == 0);
 325     pa_signal_new(SIGINT, signal_callback, c);
 326     pa_signal_new(SIGTERM, signal_callback, c);
 327     signal(SIGPIPE, SIG_IGN);
 328
 329     c = pa_core_new(pa_mainloop_get_api(mainloop));
 330     assert(c);
 331
 332     pa_signal_new(SIGUSR1, signal_callback, c);
 333     pa_signal_new(SIGUSR2, signal_callback, c);
 334     pa_signal_new(SIGHUP, signal_callback, c);
 335
 336     r = pa_cpu_limit_init(pa_mainloop_get_api(mainloop));
 337     assert(r == 0);
 338
 339     buf = pa_strbuf_new();
 340     assert(buf);
 341     if (conf->default_script_file)
 342         r = pa_cli_command_execute_file(c, conf->default_script_file, buf, &conf->fail);
 343
 344     if (r >= 0)
 345         r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail);
 346     pa_log(s = pa_strbuf_tostring_free(buf));
 347     pa_xfree(s);
 348
 349     if (r < 0 && conf->fail) {
 350         pa_log(__FILE__": failed to initialize daemon.\n");
 351         if (conf->daemonize)
 352             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 353     } else if (!c->modules || pa_idxset_ncontents(c->modules) == 0) {
 354         pa_log(__FILE__": daemon startup without any loaded modules, refusing to work.\n");
 355         if (conf->daemonize)
 356             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 357     } else {
 358
 359         retval = 0;
 360         if (conf->daemonize)
 361             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval));
 362
 363         c->disallow_module_loading = conf->disallow_module_loading;
 364         c->exit_idle_time = conf->exit_idle_time;
 365         c->module_idle_time = conf->module_idle_time;
 366         c->scache_idle_time = conf->scache_idle_time;
 367         c->resample_method = conf->resample_method;
 368
 369         pa_log_info(__FILE__": Daemon startup complete.\n");
 370         if (pa_mainloop_run(mainloop, &retval) < 0)
 371             retval = 1;
 372         pa_log_info(__FILE__": Daemon shutdown initiated.\n");
 373     }
 374
 375     pa_core_free(c);
 376
 377     pa_cpu_limit_done();
 378     pa_signal_done();
 379     pa_mainloop_free(mainloop);
 380
 381     pa_log_info(__FILE__": Daemon terminated.\n");
 382
 383 finish:
 384
 385     if (conf)
 386         pa_daemon_conf_free(conf);
 387
 388     if (valid_pid_file)
 389         pa_pid_file_remove();
 390
 391     close_pipe(daemon_pipe);
 392
 393     lt_dlexit();
 394
 395     return retval;
 396 }