code.delx.au - pulseaudio/blob - src/daemon/main.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   PulseAudio 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   PulseAudio 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 PulseAudio; 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 <limits.h>
  36 #include <fcntl.h>
  37 #include <unistd.h>
  38 #include <locale.h>
  39 #include <sys/types.h>
  40 #include <pwd.h>
  41 #include <grp.h>
  42
  43 #include <liboil/liboil.h>
  44
  45 #ifdef HAVE_SYS_IOCTL_H
  46 #include <sys/ioctl.h>
  47 #endif
  48
  49 #ifdef HAVE_LIBWRAP
  50 #include <syslog.h>
  51 #include <tcpd.h>
  52 #endif
  53
  54 #include "../pulsecore/winsock.h"
  55
  56 #include <pulse/mainloop.h>
  57 #include <pulse/mainloop-signal.h>
  58 #include <pulse/timeval.h>
  59 #include <pulse/xmalloc.h>
  60
  61 #include <pulsecore/core-error.h>
  62 #include <pulsecore/core.h>
  63 #include <pulsecore/memblock.h>
  64 #include <pulsecore/module.h>
  65 #include <pulsecore/cli-command.h>
  66 #include <pulsecore/log.h>
  67 #include <pulsecore/core-util.h>
  68 #include <pulsecore/sioman.h>
  69 #include <pulsecore/cli-text.h>
  70 #include <pulsecore/pid.h>
  71 #include <pulsecore/namereg.h>
  72 #include <pulsecore/random.h>
  73
  74 #include "cmdline.h"
  75 #include "cpulimit.h"
  76 #include "daemon-conf.h"
  77 #include "dumpmodules.h"
  78 #include "caps.h"
  79
  80 #ifdef HAVE_LIBWRAP
  81 /* Only one instance of these variables */
  82 int allow_severity = LOG_INFO;
  83 int deny_severity = LOG_WARNING;
  84 #endif
  85
  86 #ifdef HAVE_OSS
  87 /* padsp looks for this symbol in the running process and disables
  88  * itself if it finds it and it is set to 7 (which is actually a bit
  89  * mask). For details see padsp. */
  90 int __padsp_disabled__ = 7;
  91 #endif
  92
  93 #ifdef OS_IS_WIN32
  94
  95 static void message_cb(pa_mainloop_api*a, pa_time_event*e, PA_GCC_UNUSED const struct timeval *tv, void *userdata) {
  96     MSG msg;
  97     struct timeval tvnext;
  98
  99     while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
 100         if (msg.message == WM_QUIT)
 101             raise(SIGTERM);
 102         else {
 103             TranslateMessage(&msg);
 104             DispatchMessage(&msg);
 105         }
 106     }
 107
 108     pa_timeval_add(pa_gettimeofday(&tvnext), 100000);
 109     a->time_restart(e, &tvnext);
 110 }
 111
 112 #endif
 113
 114 static void signal_callback(pa_mainloop_api*m, PA_GCC_UNUSED pa_signal_event *e, int sig, void *userdata) {
 115     pa_log_info(__FILE__": Got signal %s.", pa_strsignal(sig));
 116
 117     switch (sig) {
 118 #ifdef SIGUSR1
 119         case SIGUSR1:
 120             pa_module_load(userdata, "module-cli", NULL);
 121             break;
 122 #endif
 123
 124 #ifdef SIGUSR2
 125         case SIGUSR2:
 126             pa_module_load(userdata, "module-cli-protocol-unix", NULL);
 127             break;
 128 #endif
 129
 130 #ifdef SIGHUP
 131         case SIGHUP: {
 132             char *c = pa_full_status_string(userdata);
 133             pa_log_notice("%s", c);
 134             pa_xfree(c);
 135             return;
 136         }
 137 #endif
 138
 139         case SIGINT:
 140         case SIGTERM:
 141         default:
 142             pa_log_info(__FILE__": Exiting.");
 143             m->quit(m, 1);
 144             break;
 145     }
 146 }
 147
 148 static void close_pipe(int p[2]) {
 149     if (p[0] != -1)
 150         close(p[0]);
 151     if (p[1] != -1)
 152         close(p[1]);
 153     p[0] = p[1] = -1;
 154 }
 155
 156 #define set_env(key, value) putenv(pa_sprintf_malloc("%s=%s", (key), (value)))
 157
 158 static int change_user(void) {
 159     struct passwd *pw;
 160     struct group * gr;
 161     int r;
 162
 163     /* This function is called only in system-wide mode. It creates a
 164      * runtime dir in /var/run/ with proper UID/GID and drops privs
 165      * afterwards. */
 166
 167     if (!(pw = getpwnam(PA_SYSTEM_USER))) {
 168         pa_log(__FILE__": Failed to find user '%s'.", PA_SYSTEM_USER);
 169         return -1;
 170     }
 171
 172     if (!(gr = getgrnam(PA_SYSTEM_GROUP))) {
 173         pa_log(__FILE__": Failed to find group '%s'.", PA_SYSTEM_GROUP);
 174         return -1;
 175     }
 176
 177     pa_log_info(__FILE__": Found user '%s' (UID %lu) and group '%s' (GID %lu).",
 178                 PA_SYSTEM_USER, (unsigned long) pw->pw_uid,
 179                 PA_SYSTEM_GROUP, (unsigned long) gr->gr_gid);
 180
 181     if (pw->pw_gid != gr->gr_gid) {
 182         pa_log(__FILE__": GID of user '%s' and of group '%s' don't match.", PA_SYSTEM_USER, PA_SYSTEM_GROUP);
 183         return -1;
 184     }
 185
 186     if (strcmp(pw->pw_dir, PA_SYSTEM_RUNTIME_PATH) != 0)
 187         pa_log_warn(__FILE__": Warning: home directory of user '%s' is not '%s', ignoring.", PA_SYSTEM_USER, PA_SYSTEM_RUNTIME_PATH);
 188
 189     if (pa_make_secure_dir(PA_SYSTEM_RUNTIME_PATH, 0755, pw->pw_uid, gr->gr_gid) < 0) {
 190         pa_log(__FILE__": Failed to create '%s': %s", PA_SYSTEM_RUNTIME_PATH, pa_cstrerror(errno));
 191         return -1;
 192     }
 193
 194     if (initgroups(PA_SYSTEM_USER, gr->gr_gid) != 0) {
 195         pa_log(__FILE__": Failed to change group list: %s", pa_cstrerror(errno));
 196         return -1;
 197     }
 198
 199 #if defined(HAVE_SETRESGID)
 200     r = setresgid(gr->gr_gid, gr->gr_gid, gr->gr_gid);
 201 #elif defined(HAVE_SETEGID)
 202     if ((r = setgid(gr->gr_gid)) >= 0)
 203         r = setegid(gr->gr_gid);
 204 #elif defined(HAVE_SETREGID)
 205     r = setregid(gr->gr_gid, gr->gr_gid);
 206 #else
 207 #error "No API to drop priviliges"
 208 #endif
 209
 210     if (r < 0) {
 211         pa_log(__FILE__": Failed to change GID: %s", pa_cstrerror(errno));
 212         return -1;
 213     }
 214
 215 #if defined(HAVE_SETRESUID)
 216     r = setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid);
 217 #elif defined(HAVE_SETEUID)
 218     if ((r = setuid(pw->pw_uid)) >= 0)
 219         r = seteuid(pw->pw_uid);
 220 #elif defined(HAVE_SETREUID)
 221     r = setreuid(pw->pw_uid, pw->pw_uid);
 222 #else
 223 #error "No API to drop priviliges"
 224 #endif
 225
 226     if (r < 0) {
 227         pa_log(__FILE__": Failed to change UID: %s", pa_cstrerror(errno));
 228         return -1;
 229     }
 230
 231     set_env("USER", PA_SYSTEM_USER);
 232     set_env("LOGNAME", PA_SYSTEM_GROUP);
 233     set_env("HOME", PA_SYSTEM_RUNTIME_PATH);
 234
 235     /* Relevant for pa_runtime_path() */
 236     set_env("PULSE_RUNTIME_PATH", PA_SYSTEM_RUNTIME_PATH);
 237     set_env("PULSE_CONFIG_PATH", PA_SYSTEM_RUNTIME_PATH);
 238
 239     pa_log_info(__FILE__": Successfully dropped root privileges.");
 240
 241     return 0;
 242 }
 243
 244 static int create_runtime_dir(void) {
 245     char fn[PATH_MAX];
 246
 247     pa_runtime_path(NULL, fn, sizeof(fn));
 248
 249     /* This function is called only when the daemon is started in
 250      * per-user mode. We create the runtime directory somewhere in
 251      * /tmp/ with the current UID/GID */
 252
 253     if (pa_make_secure_dir(fn, 0700, (uid_t)-1, (gid_t)-1) < 0) {
 254         pa_log(__FILE__": Failed to create '%s': %s", fn, pa_cstrerror(errno));
 255         return -1;
 256     }
 257
 258     return 0;
 259 }
 260
 261 int main(int argc, char *argv[]) {
 262     pa_core *c;
 263     pa_strbuf *buf = NULL;
 264     pa_daemon_conf *conf;
 265     pa_mainloop *mainloop;
 266
 267     char *s;
 268     int r, retval = 1, d = 0;
 269     int daemon_pipe[2] = { -1, -1 };
 270     int suid_root;
 271     int valid_pid_file = 0;
 272
 273 #ifdef HAVE_GETUID
 274     gid_t gid = (gid_t) -1;
 275 #endif
 276
 277 #ifdef OS_IS_WIN32
 278     pa_time_event *timer;
 279     struct timeval tv;
 280 #endif
 281
 282     setlocale(LC_ALL, "");
 283
 284     if (getuid() != 0)
 285         pa_limit_caps();
 286
 287 #ifdef HAVE_GETUID
 288     suid_root = getuid() != 0 && geteuid() == 0;
 289
 290     if (suid_root && (pa_own_uid_in_group(PA_REALTIME_GROUP, &gid) <= 0 || gid >= 1000)) {
 291         pa_log_warn(__FILE__": WARNING: called SUID root, but not in group '"PA_REALTIME_GROUP"'.");
 292         pa_drop_root();
 293     }
 294 #else
 295     suid_root = 0;
 296 #endif
 297
 298     LTDL_SET_PRELOADED_SYMBOLS();
 299
 300     r = lt_dlinit();
 301     assert(r == 0);
 302
 303 #ifdef OS_IS_WIN32
 304     {
 305         WSADATA data;
 306         WSAStartup(MAKEWORD(2, 0), &data);
 307     }
 308 #endif
 309
 310     pa_random_seed();
 311
 312     pa_log_set_ident("pulseaudio");
 313
 314     conf = pa_daemon_conf_new();
 315
 316     if (pa_daemon_conf_load(conf, NULL) < 0)
 317         goto finish;
 318
 319     if (pa_daemon_conf_env(conf) < 0)
 320         goto finish;
 321
 322     if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
 323         pa_log(__FILE__": failed to parse command line.");
 324         goto finish;
 325     }
 326
 327     pa_log_set_maximal_level(conf->log_level);
 328     pa_log_set_target(conf->auto_log_target ? PA_LOG_STDERR : conf->log_target, NULL);
 329
 330     if (conf->high_priority && conf->cmd == PA_CMD_DAEMON)
 331         pa_raise_priority();
 332
 333     if (getuid() != 0)
 334         pa_drop_caps();
 335
 336     if (suid_root)
 337         pa_drop_root();
 338
 339     if (conf->dl_search_path)
 340         lt_dlsetsearchpath(conf->dl_search_path);
 341
 342     switch (conf->cmd) {
 343         case PA_CMD_DUMP_MODULES:
 344             pa_dump_modules(conf, argc-d, argv+d);
 345             retval = 0;
 346             goto finish;
 347
 348         case PA_CMD_DUMP_CONF: {
 349             s = pa_daemon_conf_dump(conf);
 350             fputs(s, stdout);
 351             pa_xfree(s);
 352             retval = 0;
 353             goto finish;
 354         }
 355
 356         case PA_CMD_HELP :
 357             pa_cmdline_help(argv[0]);
 358             retval = 0;
 359             goto finish;
 360
 361         case PA_CMD_VERSION :
 362             printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
 363             retval = 0;
 364             goto finish;
 365
 366         case PA_CMD_CHECK: {
 367             pid_t pid;
 368
 369             if (pa_pid_file_check_running(&pid) < 0) {
 370                 pa_log_info(__FILE__": daemon not running");
 371             } else {
 372                 pa_log_info(__FILE__": daemon running as PID %u", pid);
 373                 retval = 0;
 374             }
 375
 376             goto finish;
 377
 378         }
 379         case PA_CMD_KILL:
 380
 381             if (pa_pid_file_kill(SIGINT, NULL) < 0)
 382                 pa_log(__FILE__": failed to kill daemon.");
 383             else
 384                 retval = 0;
 385
 386             goto finish;
 387
 388         default:
 389             assert(conf->cmd == PA_CMD_DAEMON);
 390     }
 391
 392     if (getuid() == 0 && !conf->system_instance) {
 393         pa_log(__FILE__": This program is not intended to be run as root (unless --system is specified).");
 394         goto finish;
 395     } else if (getuid() != 0 && conf->system_instance) {
 396         pa_log(__FILE__": Root priviliges required.");
 397         goto finish;
 398     }
 399
 400     if (conf->daemonize) {
 401         pid_t child;
 402         int tty_fd;
 403
 404         if (pa_stdio_acquire() < 0) {
 405             pa_log(__FILE__": failed to acquire stdio.");
 406             goto finish;
 407         }
 408
 409 #ifdef HAVE_FORK
 410         if (pipe(daemon_pipe) < 0) {
 411             pa_log(__FILE__": failed to create pipe.");
 412             goto finish;
 413         }
 414
 415         if ((child = fork()) < 0) {
 416             pa_log(__FILE__": fork() failed: %s", pa_cstrerror(errno));
 417             goto finish;
 418         }
 419
 420         if (child != 0) {
 421             /* Father */
 422
 423             close(daemon_pipe[1]);
 424             daemon_pipe[1] = -1;
 425
 426             if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval), NULL) != sizeof(retval)) {
 427                 pa_log(__FILE__": read() failed: %s", pa_cstrerror(errno));
 428                 retval = 1;
 429             }
 430
 431             if (retval)
 432                 pa_log(__FILE__": daemon startup failed.");
 433             else
 434                 pa_log_info(__FILE__": daemon startup successful.");
 435
 436             goto finish;
 437         }
 438
 439         close(daemon_pipe[0]);
 440         daemon_pipe[0] = -1;
 441 #endif
 442
 443         if (conf->auto_log_target)
 444             pa_log_set_target(PA_LOG_SYSLOG, NULL);
 445
 446 #ifdef HAVE_SETSID
 447         setsid();
 448 #endif
 449 #ifdef HAVE_SETPGID
 450         setpgid(0,0);
 451 #endif
 452
 453 #ifndef OS_IS_WIN32
 454         close(0);
 455         close(1);
 456         close(2);
 457
 458         open("/dev/null", O_RDONLY);
 459         open("/dev/null", O_WRONLY);
 460         open("/dev/null", O_WRONLY);
 461 #else
 462         FreeConsole();
 463 #endif
 464
 465 #ifdef SIGTTOU
 466         signal(SIGTTOU, SIG_IGN);
 467 #endif
 468 #ifdef SIGTTIN
 469         signal(SIGTTIN, SIG_IGN);
 470 #endif
 471 #ifdef SIGTSTP
 472         signal(SIGTSTP, SIG_IGN);
 473 #endif
 474
 475 #ifdef TIOCNOTTY
 476         if ((tty_fd = open("/dev/tty", O_RDWR)) >= 0) {
 477             ioctl(tty_fd, TIOCNOTTY, (char*) 0);
 478             close(tty_fd);
 479         }
 480 #endif
 481     }
 482
 483     chdir("/");
 484     umask(0022);
 485
 486     if (conf->system_instance) {
 487         if (change_user() < 0)
 488             goto finish;
 489     } else if (create_runtime_dir() < 0)
 490         goto finish;
 491
 492     if (conf->use_pid_file) {
 493         if (pa_pid_file_create() < 0) {
 494             pa_log(__FILE__": pa_pid_file_create() failed.");
 495 #ifdef HAVE_FORK
 496             if (conf->daemonize)
 497                 pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 498 #endif
 499             goto finish;
 500         }
 501
 502         valid_pid_file = 1;
 503     }
 504
 505 #ifdef SIGPIPE
 506     signal(SIGPIPE, SIG_IGN);
 507 #endif
 508
 509     mainloop = pa_mainloop_new();
 510     assert(mainloop);
 511
 512     c = pa_core_new(pa_mainloop_get_api(mainloop));
 513     assert(c);
 514     c->is_system_instance = !!conf->system_instance;
 515
 516     r = pa_signal_init(pa_mainloop_get_api(mainloop));
 517     assert(r == 0);
 518     pa_signal_new(SIGINT, signal_callback, c);
 519     pa_signal_new(SIGTERM, signal_callback, c);
 520
 521 #ifdef SIGUSR1
 522     pa_signal_new(SIGUSR1, signal_callback, c);
 523 #endif
 524 #ifdef SIGUSR2
 525     pa_signal_new(SIGUSR2, signal_callback, c);
 526 #endif
 527 #ifdef SIGHUP
 528     pa_signal_new(SIGHUP, signal_callback, c);
 529 #endif
 530
 531 #ifdef OS_IS_WIN32
 532     timer = pa_mainloop_get_api(mainloop)->time_new(
 533         pa_mainloop_get_api(mainloop), pa_gettimeofday(&tv), message_cb, NULL);
 534     assert(timer);
 535 #endif
 536
 537     if (conf->daemonize)
 538         c->running_as_daemon = 1;
 539
 540     oil_init();
 541
 542     r = pa_cpu_limit_init(pa_mainloop_get_api(mainloop));
 543     assert(r == 0);
 544
 545     buf = pa_strbuf_new();
 546     if (conf->default_script_file)
 547         r = pa_cli_command_execute_file(c, conf->default_script_file, buf, &conf->fail);
 548
 549     if (r >= 0)
 550         r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail);
 551     pa_log_error("%s", s = pa_strbuf_tostring_free(buf));
 552     pa_xfree(s);
 553
 554     if (r < 0 && conf->fail) {
 555         pa_log(__FILE__": failed to initialize daemon.");
 556 #ifdef HAVE_FORK
 557         if (conf->daemonize)
 558             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 559 #endif
 560     } else if (!c->modules || pa_idxset_size(c->modules) == 0) {
 561         pa_log(__FILE__": daemon startup without any loaded modules, refusing to work.");
 562 #ifdef HAVE_FORK
 563         if (conf->daemonize)
 564             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 565 #endif
 566     } else {
 567
 568         retval = 0;
 569 #ifdef HAVE_FORK
 570         if (conf->daemonize)
 571             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 572 #endif
 573
 574         c->disallow_module_loading = conf->disallow_module_loading;
 575         c->exit_idle_time = conf->exit_idle_time;
 576         c->module_idle_time = conf->module_idle_time;
 577         c->scache_idle_time = conf->scache_idle_time;
 578         c->resample_method = conf->resample_method;
 579
 580         if (c->default_sink_name &&
 581             pa_namereg_get(c, c->default_sink_name, PA_NAMEREG_SINK, 1) == NULL) {
 582             pa_log_error("%s : Fatal error. Default sink name (%s) does not exist in name register.", __FILE__, c->default_sink_name);
 583             retval = 1;
 584         } else {
 585             pa_log_info(__FILE__": Daemon startup complete.");
 586             if (pa_mainloop_run(mainloop, &retval) < 0)
 587                 retval = 1;
 588             pa_log_info(__FILE__": Daemon shutdown initiated.");
 589         }
 590     }
 591
 592 #ifdef OS_IS_WIN32
 593     pa_mainloop_get_api(mainloop)->time_free(timer);
 594 #endif
 595
 596     pa_core_free(c);
 597
 598     pa_cpu_limit_done();
 599     pa_signal_done();
 600     pa_mainloop_free(mainloop);
 601
 602     pa_log_info(__FILE__": Daemon terminated.");
 603
 604 finish:
 605
 606     if (conf)
 607         pa_daemon_conf_free(conf);
 608
 609     if (valid_pid_file)
 610         pa_pid_file_remove();
 611
 612     close_pipe(daemon_pipe);
 613
 614 #ifdef OS_IS_WIN32
 615     WSACleanup();
 616 #endif
 617
 618     lt_dlexit();
 619
 620     return retval;
 621 }