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     /* This function is called only in system-wide mode. It creates a
 163      * runtime dir in /var/run/ with proper UID/GID and drops privs
 164      * afterwards. */
 165
 166     if (!(pw = getpwnam(PA_SYSTEM_USER))) {
 167         pa_log(__FILE__": Failed to find user '%s'.", PA_SYSTEM_USER);
 168         return -1;
 169     }
 170
 171     if (!(gr = getgrnam(PA_SYSTEM_GROUP))) {
 172         pa_log(__FILE__": Failed to find group '%s'.", PA_SYSTEM_GROUP);
 173         return -1;
 174     }
 175
 176     pa_log_info(__FILE__": Found user '%s' (UID %lu) and group '%s' (GID %lu).",
 177                 PA_SYSTEM_USER, (unsigned long) pw->pw_uid,
 178                 PA_SYSTEM_GROUP, (unsigned long) gr->gr_gid);
 179
 180     if (pw->pw_gid != gr->gr_gid) {
 181         pa_log(__FILE__": GID of user '%s' and of group '%s' don't match.", PA_SYSTEM_USER, PA_SYSTEM_GROUP);
 182         return -1;
 183     }
 184
 185     if (strcmp(pw->pw_dir, PA_SYSTEM_RUNTIME_PATH) != 0)
 186         pa_log_warn(__FILE__": Warning: home directory of user '%s' is not '%s', ignoring.", PA_SYSTEM_USER, PA_SYSTEM_RUNTIME_PATH);
 187
 188     if (pa_make_secure_dir(PA_SYSTEM_RUNTIME_PATH, 0755, pw->pw_uid, gr->gr_gid) < 0) {
 189         pa_log(__FILE__": Failed to create '%s': %s", PA_SYSTEM_RUNTIME_PATH, pa_cstrerror(errno));
 190         return -1;
 191     }
 192
 193     if (initgroups(PA_SYSTEM_USER, gr->gr_gid) != 0) {
 194         pa_log(__FILE__": Failed to change group list: %s", pa_cstrerror(errno));
 195         return -1;
 196     }
 197
 198 #if defined(HAVE_SETRESGID)
 199     r = setresgid(gr->gr_gid, gr->gr_gid, gr->gr_gid);
 200 #elif defined(HAVE_SETEGID)
 201     if ((r = setgid(gr->gr_gid)) >= 0)
 202         r = setegid(gr->gr_gid);
 203 #elif defined(HAVE_SETREGID)
 204     r = setregid(gr->gr_gid, gr->gr_gid);
 205 #else
 206 #error "No API to drop priviliges"
 207 #endif
 208
 209     if (r < 0) {
 210         pa_log(__FILE__": Failed to change GID: %s", pa_cstrerror(errno));
 211         return -1;
 212     }
 213
 214 #if defined(HAVE_SETRESUID)
 215     r = setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid);
 216 #elif defined(HAVE_SETEUID)
 217     if ((r = setuid(pw->pw_uid)) >= 0)
 218         r = seteuid(pw->pw_uid);
 219 #elif defined(HAVE_SETREUID)
 220     r = setreuid(pw->pw_uid, pw->pw_uid);
 221 #else
 222 #error "No API to drop priviliges"
 223 #endif
 224
 225     if (r < 0) {
 226         pa_log(__FILE__": Failed to change UID: %s", pa_cstrerror(errno));
 227         return -1;
 228     }
 229
 230     set_env("USER", PA_SYSTEM_USER);
 231     set_env("LOGNAME", PA_SYSTEM_GROUP);
 232     set_env("HOME", PA_SYSTEM_RUNTIME_PATH);
 233
 234     /* Relevant for pa_runtime_path() */
 235     set_env("PULSE_RUNTIME_PATH", PA_SYSTEM_RUNTIME_PATH);
 236     set_env("PULSE_CONFIG_PATH", PA_SYSTEM_RUNTIME_PATH);
 237
 238     pa_log_info(__FILE__": Successfully dropped root privileges.");
 239
 240     return 0;
 241 }
 242
 243 static int create_runtime_dir(void) {
 244     char fn[PATH_MAX];
 245
 246     pa_runtime_path(NULL, fn, sizeof(fn));
 247
 248     /* This function is called only when the daemon is started in
 249      * per-user mode. We create the runtime directory somewhere in
 250      * /tmp/ with the current UID/GID */
 251
 252     if (pa_make_secure_dir(fn, 0700, getuid(), getgid()) < 0) {
 253         pa_log(__FILE__": Failed to create '%s': %s", fn, pa_cstrerror(errno));
 254         return -1;
 255     }
 256
 257     return 0;
 258 }
 259
 260 int main(int argc, char *argv[]) {
 261     pa_core *c;
 262     pa_strbuf *buf = NULL;
 263     pa_daemon_conf *conf;
 264     pa_mainloop *mainloop;
 265
 266     char *s;
 267     int r, retval = 1, d = 0;
 268     int daemon_pipe[2] = { -1, -1 };
 269     int suid_root;
 270     int valid_pid_file = 0;
 271
 272 #ifdef HAVE_GETUID
 273     gid_t gid = (gid_t) -1;
 274 #endif
 275
 276 #ifdef OS_IS_WIN32
 277     pa_time_event *timer;
 278     struct timeval tv;
 279 #endif
 280
 281     setlocale(LC_ALL, "");
 282
 283     if (getuid() != 0)
 284         pa_limit_caps();
 285
 286 #ifdef HAVE_GETUID
 287     suid_root = getuid() != 0 && geteuid() == 0;
 288
 289     if (suid_root && (pa_own_uid_in_group(PA_REALTIME_GROUP, &gid) <= 0 || gid >= 1000)) {
 290         pa_log_warn(__FILE__": WARNING: called SUID root, but not in group '"PA_REALTIME_GROUP"'.");
 291         pa_drop_root();
 292     }
 293 #else
 294     suid_root = 0;
 295 #endif
 296
 297     LTDL_SET_PRELOADED_SYMBOLS();
 298
 299     r = lt_dlinit();
 300     assert(r == 0);
 301
 302 #ifdef OS_IS_WIN32
 303     {
 304         WSADATA data;
 305         WSAStartup(MAKEWORD(2, 0), &data);
 306     }
 307 #endif
 308
 309     pa_random_seed();
 310
 311     pa_log_set_ident("pulseaudio");
 312
 313     conf = pa_daemon_conf_new();
 314
 315     if (pa_daemon_conf_load(conf, NULL) < 0)
 316         goto finish;
 317
 318     if (pa_daemon_conf_env(conf) < 0)
 319         goto finish;
 320
 321     if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
 322         pa_log(__FILE__": failed to parse command line.");
 323         goto finish;
 324     }
 325
 326     pa_log_set_maximal_level(conf->log_level);
 327     pa_log_set_target(conf->auto_log_target ? PA_LOG_STDERR : conf->log_target, NULL);
 328
 329     if (conf->high_priority && conf->cmd == PA_CMD_DAEMON)
 330         pa_raise_priority();
 331
 332     if (getuid() != 0)
 333         pa_drop_caps();
 334
 335     if (suid_root)
 336         pa_drop_root();
 337
 338     if (conf->dl_search_path)
 339         lt_dlsetsearchpath(conf->dl_search_path);
 340
 341     switch (conf->cmd) {
 342         case PA_CMD_DUMP_MODULES:
 343             pa_dump_modules(conf, argc-d, argv+d);
 344             retval = 0;
 345             goto finish;
 346
 347         case PA_CMD_DUMP_CONF: {
 348             s = pa_daemon_conf_dump(conf);
 349             fputs(s, stdout);
 350             pa_xfree(s);
 351             retval = 0;
 352             goto finish;
 353         }
 354
 355         case PA_CMD_HELP :
 356             pa_cmdline_help(argv[0]);
 357             retval = 0;
 358             goto finish;
 359
 360         case PA_CMD_VERSION :
 361             printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
 362             retval = 0;
 363             goto finish;
 364
 365         case PA_CMD_CHECK: {
 366             pid_t pid;
 367
 368             if (pa_pid_file_check_running(&pid) < 0) {
 369                 pa_log_info(__FILE__": daemon not running");
 370             } else {
 371                 pa_log_info(__FILE__": daemon running as PID %u", pid);
 372                 retval = 0;
 373             }
 374
 375             goto finish;
 376
 377         }
 378         case PA_CMD_KILL:
 379
 380             if (pa_pid_file_kill(SIGINT, NULL) < 0)
 381                 pa_log(__FILE__": failed to kill daemon.");
 382             else
 383                 retval = 0;
 384
 385             goto finish;
 386
 387         default:
 388             assert(conf->cmd == PA_CMD_DAEMON);
 389     }
 390
 391     if (getuid() == 0 && !conf->system_instance) {
 392         pa_log(__FILE__": This program is not intended to be run as root (unless --system is specified).");
 393         goto finish;
 394     } else if (getuid() != 0 && conf->system_instance) {
 395         pa_log(__FILE__": Root priviliges required.");
 396         goto finish;
 397     }
 398
 399     if (conf->daemonize) {
 400         pid_t child;
 401         int tty_fd;
 402
 403         if (pa_stdio_acquire() < 0) {
 404             pa_log(__FILE__": failed to acquire stdio.");
 405             goto finish;
 406         }
 407
 408 #ifdef HAVE_FORK
 409         if (pipe(daemon_pipe) < 0) {
 410             pa_log(__FILE__": failed to create pipe.");
 411             goto finish;
 412         }
 413
 414         if ((child = fork()) < 0) {
 415             pa_log(__FILE__": fork() failed: %s", pa_cstrerror(errno));
 416             goto finish;
 417         }
 418
 419         if (child != 0) {
 420             /* Father */
 421
 422             close(daemon_pipe[1]);
 423             daemon_pipe[1] = -1;
 424
 425             if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval), NULL) != sizeof(retval)) {
 426                 pa_log(__FILE__": read() failed: %s", pa_cstrerror(errno));
 427                 retval = 1;
 428             }
 429
 430             if (retval)
 431                 pa_log(__FILE__": daemon startup failed.");
 432             else
 433                 pa_log_info(__FILE__": daemon startup successful.");
 434
 435             goto finish;
 436         }
 437
 438         close(daemon_pipe[0]);
 439         daemon_pipe[0] = -1;
 440 #endif
 441
 442         if (conf->auto_log_target)
 443             pa_log_set_target(PA_LOG_SYSLOG, NULL);
 444
 445 #ifdef HAVE_SETSID
 446         setsid();
 447 #endif
 448 #ifdef HAVE_SETPGID
 449         setpgid(0,0);
 450 #endif
 451
 452 #ifndef OS_IS_WIN32
 453         close(0);
 454         close(1);
 455         close(2);
 456
 457         open("/dev/null", O_RDONLY);
 458         open("/dev/null", O_WRONLY);
 459         open("/dev/null", O_WRONLY);
 460 #else
 461         FreeConsole();
 462 #endif
 463
 464 #ifdef SIGTTOU
 465         signal(SIGTTOU, SIG_IGN);
 466 #endif
 467 #ifdef SIGTTIN
 468         signal(SIGTTIN, SIG_IGN);
 469 #endif
 470 #ifdef SIGTSTP
 471         signal(SIGTSTP, SIG_IGN);
 472 #endif
 473
 474 #ifdef TIOCNOTTY
 475         if ((tty_fd = open("/dev/tty", O_RDWR)) >= 0) {
 476             ioctl(tty_fd, TIOCNOTTY, (char*) 0);
 477             close(tty_fd);
 478         }
 479 #endif
 480     }
 481
 482     chdir("/");
 483     umask(0022);
 484
 485     if (conf->system_instance) {
 486         if (change_user() < 0)
 487             goto finish;
 488     } else if (create_runtime_dir() < 0)
 489         goto finish;
 490
 491     if (conf->use_pid_file) {
 492         if (pa_pid_file_create() < 0) {
 493             pa_log(__FILE__": pa_pid_file_create() failed.");
 494 #ifdef HAVE_FORK
 495             if (conf->daemonize)
 496                 pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 497 #endif
 498             goto finish;
 499         }
 500
 501         valid_pid_file = 1;
 502     }
 503
 504 #ifdef SIGPIPE
 505     signal(SIGPIPE, SIG_IGN);
 506 #endif
 507
 508     mainloop = pa_mainloop_new();
 509     assert(mainloop);
 510
 511     c = pa_core_new(pa_mainloop_get_api(mainloop));
 512     assert(c);
 513     c->is_system_instance = !!conf->system_instance;
 514
 515     r = pa_signal_init(pa_mainloop_get_api(mainloop));
 516     assert(r == 0);
 517     pa_signal_new(SIGINT, signal_callback, c);
 518     pa_signal_new(SIGTERM, signal_callback, c);
 519
 520 #ifdef SIGUSR1
 521     pa_signal_new(SIGUSR1, signal_callback, c);
 522 #endif
 523 #ifdef SIGUSR2
 524     pa_signal_new(SIGUSR2, signal_callback, c);
 525 #endif
 526 #ifdef SIGHUP
 527     pa_signal_new(SIGHUP, signal_callback, c);
 528 #endif
 529
 530 #ifdef OS_IS_WIN32
 531     timer = pa_mainloop_get_api(mainloop)->time_new(
 532         pa_mainloop_get_api(mainloop), pa_gettimeofday(&tv), message_cb, NULL);
 533     assert(timer);
 534 #endif
 535
 536     if (conf->daemonize)
 537         c->running_as_daemon = 1;
 538
 539     oil_init();
 540
 541     r = pa_cpu_limit_init(pa_mainloop_get_api(mainloop));
 542     assert(r == 0);
 543
 544     buf = pa_strbuf_new();
 545     if (conf->default_script_file)
 546         r = pa_cli_command_execute_file(c, conf->default_script_file, buf, &conf->fail);
 547
 548     if (r >= 0)
 549         r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail);
 550     pa_log_error("%s", s = pa_strbuf_tostring_free(buf));
 551     pa_xfree(s);
 552
 553     if (r < 0 && conf->fail) {
 554         pa_log(__FILE__": failed to initialize daemon.");
 555 #ifdef HAVE_FORK
 556         if (conf->daemonize)
 557             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 558 #endif
 559     } else if (!c->modules || pa_idxset_size(c->modules) == 0) {
 560         pa_log(__FILE__": daemon startup without any loaded modules, refusing to work.");
 561 #ifdef HAVE_FORK
 562         if (conf->daemonize)
 563             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 564 #endif
 565     } else {
 566
 567         retval = 0;
 568 #ifdef HAVE_FORK
 569         if (conf->daemonize)
 570             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 571 #endif
 572
 573         c->disallow_module_loading = conf->disallow_module_loading;
 574         c->exit_idle_time = conf->exit_idle_time;
 575         c->module_idle_time = conf->module_idle_time;
 576         c->scache_idle_time = conf->scache_idle_time;
 577         c->resample_method = conf->resample_method;
 578
 579         if (c->default_sink_name &&
 580             pa_namereg_get(c, c->default_sink_name, PA_NAMEREG_SINK, 1) == NULL) {
 581             pa_log_error("%s : Fatal error. Default sink name (%s) does not exist in name register.", __FILE__, c->default_sink_name);
 582             retval = 1;
 583         } else {
 584             pa_log_info(__FILE__": Daemon startup complete.");
 585             if (pa_mainloop_run(mainloop, &retval) < 0)
 586                 retval = 1;
 587             pa_log_info(__FILE__": Daemon shutdown initiated.");
 588         }
 589     }
 590
 591 #ifdef OS_IS_WIN32
 592     pa_mainloop_get_api(mainloop)->time_free(timer);
 593 #endif
 594
 595     pa_core_free(c);
 596
 597     pa_cpu_limit_done();
 598     pa_signal_done();
 599     pa_mainloop_free(mainloop);
 600
 601     pa_log_info(__FILE__": Daemon terminated.");
 602
 603 finish:
 604
 605     if (conf)
 606         pa_daemon_conf_free(conf);
 607
 608     if (valid_pid_file)
 609         pa_pid_file_remove();
 610
 611     close_pipe(daemon_pipe);
 612
 613 #ifdef OS_IS_WIN32
 614     WSACleanup();
 615 #endif
 616
 617     lt_dlexit();
 618
 619     return retval;
 620 }