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