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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   8
   9   PulseAudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as published
  11   by the Free Software Foundation; either version 2 of the License,
  12   or (at your option) any later version.
  13
  14   PulseAudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with PulseAudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #include <unistd.h>
  30 #include <errno.h>
  31 #include <string.h>
  32 #include <stdlib.h>
  33 #include <stdio.h>
  34 #include <signal.h>
  35 #include <stddef.h>
  36 #include <assert.h>
  37 #include <ltdl.h>
  38 #include <limits.h>
  39 #include <fcntl.h>
  40 #include <unistd.h>
  41 #include <locale.h>
  42 #include <sys/types.h>
  43
  44 #include <liboil/liboil.h>
  45
  46 #ifdef HAVE_SYS_IOCTL_H
  47 #include <sys/ioctl.h>
  48 #endif
  49
  50 #ifdef HAVE_PWD_H
  51 #include <pwd.h>
  52 #endif
  53 #ifdef HAVE_GRP_H
  54 #include <grp.h>
  55 #endif
  56
  57 #ifdef HAVE_LIBWRAP
  58 #include <syslog.h>
  59 #include <tcpd.h>
  60 #endif
  61
  62 #include "../pulsecore/winsock.h"
  63
  64 #include <pulse/mainloop.h>
  65 #include <pulse/mainloop-signal.h>
  66 #include <pulse/timeval.h>
  67 #include <pulse/xmalloc.h>
  68
  69 #include <pulsecore/core-error.h>
  70 #include <pulsecore/core.h>
  71 #include <pulsecore/memblock.h>
  72 #include <pulsecore/module.h>
  73 #include <pulsecore/cli-command.h>
  74 #include <pulsecore/log.h>
  75 #include <pulsecore/core-util.h>
  76 #include <pulsecore/sioman.h>
  77 #include <pulsecore/cli-text.h>
  78 #include <pulsecore/pid.h>
  79 #include <pulsecore/namereg.h>
  80 #include <pulsecore/random.h>
  81
  82 #include "cmdline.h"
  83 #include "cpulimit.h"
  84 #include "daemon-conf.h"
  85 #include "dumpmodules.h"
  86 #include "caps.h"
  87
  88 #ifdef HAVE_LIBWRAP
  89 /* Only one instance of these variables */
  90 int allow_severity = LOG_INFO;
  91 int deny_severity = LOG_WARNING;
  92 #endif
  93
  94 #ifdef HAVE_OSS
  95 /* padsp looks for this symbol in the running process and disables
  96  * itself if it finds it and it is set to 7 (which is actually a bit
  97  * mask). For details see padsp. */
  98 int __padsp_disabled__ = 7;
  99 #endif
 100
 101 #ifdef OS_IS_WIN32
 102
 103 static void message_cb(pa_mainloop_api*a, pa_time_event*e, PA_GCC_UNUSED const struct timeval *tv, void *userdata) {
 104     MSG msg;
 105     struct timeval tvnext;
 106
 107     while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
 108         if (msg.message == WM_QUIT)
 109             raise(SIGTERM);
 110         else {
 111             TranslateMessage(&msg);
 112             DispatchMessage(&msg);
 113         }
 114     }
 115
 116     pa_timeval_add(pa_gettimeofday(&tvnext), 100000);
 117     a->time_restart(e, &tvnext);
 118 }
 119
 120 #endif
 121
 122 static void signal_callback(pa_mainloop_api*m, PA_GCC_UNUSED pa_signal_event *e, int sig, void *userdata) {
 123     pa_log_info("Got signal %s.", pa_strsignal(sig));
 124
 125     switch (sig) {
 126 #ifdef SIGUSR1
 127         case SIGUSR1:
 128             pa_module_load(userdata, "module-cli", NULL);
 129             break;
 130 #endif
 131
 132 #ifdef SIGUSR2
 133         case SIGUSR2:
 134             pa_module_load(userdata, "module-cli-protocol-unix", NULL);
 135             break;
 136 #endif
 137
 138 #ifdef SIGHUP
 139         case SIGHUP: {
 140             char *c = pa_full_status_string(userdata);
 141             pa_log_notice("%s", c);
 142             pa_xfree(c);
 143             return;
 144         }
 145 #endif
 146
 147         case SIGINT:
 148         case SIGTERM:
 149         default:
 150             pa_log_info("Exiting.");
 151             m->quit(m, 1);
 152             break;
 153     }
 154 }
 155
 156 static void close_pipe(int p[2]) {
 157     if (p[0] != -1)
 158         close(p[0]);
 159     if (p[1] != -1)
 160         close(p[1]);
 161     p[0] = p[1] = -1;
 162 }
 163
 164 #define set_env(key, value) putenv(pa_sprintf_malloc("%s=%s", (key), (value)))
 165
 166 #if defined(HAVE_PWD_H) && defined(HAVE_GRP_H)
 167
 168 static int change_user(void) {
 169     struct passwd *pw;
 170     struct group * gr;
 171     int r;
 172
 173     /* This function is called only in system-wide mode. It creates a
 174      * runtime dir in /var/run/ with proper UID/GID and drops privs
 175      * afterwards. */
 176
 177     if (!(pw = getpwnam(PA_SYSTEM_USER))) {
 178         pa_log("Failed to find user '%s'.", PA_SYSTEM_USER);
 179         return -1;
 180     }
 181
 182     if (!(gr = getgrnam(PA_SYSTEM_GROUP))) {
 183         pa_log("Failed to find group '%s'.", PA_SYSTEM_GROUP);
 184         return -1;
 185     }
 186
 187     pa_log_info("Found user '%s' (UID %lu) and group '%s' (GID %lu).",
 188                 PA_SYSTEM_USER, (unsigned long) pw->pw_uid,
 189                 PA_SYSTEM_GROUP, (unsigned long) gr->gr_gid);
 190
 191     if (pw->pw_gid != gr->gr_gid) {
 192         pa_log("GID of user '%s' and of group '%s' don't match.", PA_SYSTEM_USER, PA_SYSTEM_GROUP);
 193         return -1;
 194     }
 195
 196     if (strcmp(pw->pw_dir, PA_SYSTEM_RUNTIME_PATH) != 0)
 197         pa_log_warn("Warning: home directory of user '%s' is not '%s', ignoring.", PA_SYSTEM_USER, PA_SYSTEM_RUNTIME_PATH);
 198
 199     if (pa_make_secure_dir(PA_SYSTEM_RUNTIME_PATH, 0755, pw->pw_uid, gr->gr_gid) < 0) {
 200         pa_log("Failed to create '%s': %s", PA_SYSTEM_RUNTIME_PATH, pa_cstrerror(errno));
 201         return -1;
 202     }
 203
 204     if (initgroups(PA_SYSTEM_USER, gr->gr_gid) != 0) {
 205         pa_log("Failed to change group list: %s", pa_cstrerror(errno));
 206         return -1;
 207     }
 208
 209 #if defined(HAVE_SETRESGID)
 210     r = setresgid(gr->gr_gid, gr->gr_gid, gr->gr_gid);
 211 #elif defined(HAVE_SETEGID)
 212     if ((r = setgid(gr->gr_gid)) >= 0)
 213         r = setegid(gr->gr_gid);
 214 #elif defined(HAVE_SETREGID)
 215     r = setregid(gr->gr_gid, gr->gr_gid);
 216 #else
 217 #error "No API to drop priviliges"
 218 #endif
 219
 220     if (r < 0) {
 221         pa_log("Failed to change GID: %s", pa_cstrerror(errno));
 222         return -1;
 223     }
 224
 225 #if defined(HAVE_SETRESUID)
 226     r = setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid);
 227 #elif defined(HAVE_SETEUID)
 228     if ((r = setuid(pw->pw_uid)) >= 0)
 229         r = seteuid(pw->pw_uid);
 230 #elif defined(HAVE_SETREUID)
 231     r = setreuid(pw->pw_uid, pw->pw_uid);
 232 #else
 233 #error "No API to drop priviliges"
 234 #endif
 235
 236     if (r < 0) {
 237         pa_log("Failed to change UID: %s", pa_cstrerror(errno));
 238         return -1;
 239     }
 240
 241     set_env("USER", PA_SYSTEM_USER);
 242     set_env("LOGNAME", PA_SYSTEM_GROUP);
 243     set_env("HOME", PA_SYSTEM_RUNTIME_PATH);
 244
 245     /* Relevant for pa_runtime_path() */
 246     set_env("PULSE_RUNTIME_PATH", PA_SYSTEM_RUNTIME_PATH);
 247     set_env("PULSE_CONFIG_PATH", PA_SYSTEM_RUNTIME_PATH);
 248
 249     pa_log_info("Successfully dropped root privileges.");
 250
 251     return 0;
 252 }
 253
 254 #else /* HAVE_PWD_H && HAVE_GRP_H */
 255
 256 static int change_user(void) {
 257     pa_log("System wide mode unsupported on this platform.");
 258     return -1;
 259 }
 260
 261 #endif /* HAVE_PWD_H && HAVE_GRP_H */
 262
 263 static int create_runtime_dir(void) {
 264     char fn[PATH_MAX];
 265
 266     pa_runtime_path(NULL, fn, sizeof(fn));
 267
 268     /* This function is called only when the daemon is started in
 269      * per-user mode. We create the runtime directory somewhere in
 270      * /tmp/ with the current UID/GID */
 271
 272     if (pa_make_secure_dir(fn, 0700, (uid_t)-1, (gid_t)-1) < 0) {
 273         pa_log("Failed to create '%s': %s", fn, pa_cstrerror(errno));
 274         return -1;
 275     }
 276
 277     return 0;
 278 }
 279
 280 #ifdef HAVE_SYS_RESOURCE_H
 281
 282 static void set_one_rlimit(const pa_rlimit *r, int resource, const char *name) {
 283     struct rlimit rl;
 284     assert(r);
 285
 286     if (!r->is_set)
 287         return;
 288
 289     rl.rlim_cur = rl.rlim_max = r->value;
 290
 291     if (setrlimit(resource, &rl) < 0)
 292         pa_log_warn("setrlimit(%s, (%u, %u)) failed: %s", name, (unsigned) r->value, (unsigned) r->value, pa_cstrerror(errno));
 293 }
 294
 295 static void set_all_rlimits(const pa_daemon_conf *conf) {
 296     set_one_rlimit(&conf->rlimit_as, RLIMIT_AS, "RLIMIT_AS");
 297     set_one_rlimit(&conf->rlimit_core, RLIMIT_CORE, "RLIMIT_CORE");
 298     set_one_rlimit(&conf->rlimit_data, RLIMIT_DATA, "RLIMIT_DATA");
 299     set_one_rlimit(&conf->rlimit_fsize, RLIMIT_FSIZE, "RLIMIT_FSIZE");
 300     set_one_rlimit(&conf->rlimit_nofile, RLIMIT_NOFILE, "RLIMIT_NOFILE");
 301     set_one_rlimit(&conf->rlimit_stack, RLIMIT_STACK, "RLIMIT_STACK");
 302 #ifdef RLIMIT_NPROC
 303     set_one_rlimit(&conf->rlimit_nproc, RLIMIT_NPROC, "RLIMIT_NPROC");
 304 #endif
 305 #ifdef RLIMIT_MEMLOCK
 306     set_one_rlimit(&conf->rlimit_memlock, RLIMIT_MEMLOCK, "RLIMIT_MEMLOCK");
 307 #endif
 308 }
 309 #endif
 310
 311 int main(int argc, char *argv[]) {
 312     pa_core *c = NULL;
 313     pa_strbuf *buf = NULL;
 314     pa_daemon_conf *conf = NULL;
 315     pa_mainloop *mainloop = NULL;
 316
 317     char *s;
 318     int r, retval = 1, d = 0;
 319     int daemon_pipe[2] = { -1, -1 };
 320     int suid_root, real_root;
 321     int valid_pid_file = 0;
 322
 323 #ifdef HAVE_GETUID
 324     gid_t gid = (gid_t) -1;
 325 #endif
 326
 327 #ifdef OS_IS_WIN32
 328     pa_time_event *timer;
 329     struct timeval tv;
 330 #endif
 331
 332     setlocale(LC_ALL, "");
 333
 334     pa_limit_caps();
 335
 336 #ifdef HAVE_GETUID
 337     real_root = getuid() == 0;
 338     suid_root = !real_root && geteuid() == 0;
 339
 340     if (suid_root && (pa_own_uid_in_group(PA_REALTIME_GROUP, &gid) <= 0 || gid >= 1000)) {
 341         pa_log_warn("WARNING: called SUID root, but not in group '"PA_REALTIME_GROUP"'.");
 342         pa_drop_root();
 343     }
 344 #else
 345     real_root = 0;
 346     suid_root = 0;
 347 #endif
 348
 349     LTDL_SET_PRELOADED_SYMBOLS();
 350
 351     r = lt_dlinit();
 352     assert(r == 0);
 353
 354 #ifdef OS_IS_WIN32
 355     {
 356         WSADATA data;
 357         WSAStartup(MAKEWORD(2, 0), &data);
 358     }
 359 #endif
 360
 361     pa_random_seed();
 362
 363     pa_log_set_ident("pulseaudio");
 364
 365     conf = pa_daemon_conf_new();
 366
 367     if (pa_daemon_conf_load(conf, NULL) < 0)
 368         goto finish;
 369
 370     if (pa_daemon_conf_env(conf) < 0)
 371         goto finish;
 372
 373     if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
 374         pa_log("failed to parse command line.");
 375         goto finish;
 376     }
 377
 378     pa_log_set_maximal_level(conf->log_level);
 379     pa_log_set_target(conf->auto_log_target ? PA_LOG_STDERR : conf->log_target, NULL);
 380
 381     if (conf->high_priority && conf->cmd == PA_CMD_DAEMON)
 382         pa_raise_priority();
 383
 384     pa_drop_caps();
 385
 386     if (suid_root)
 387         pa_drop_root();
 388
 389     if (conf->dl_search_path)
 390         lt_dlsetsearchpath(conf->dl_search_path);
 391
 392     switch (conf->cmd) {
 393         case PA_CMD_DUMP_MODULES:
 394             pa_dump_modules(conf, argc-d, argv+d);
 395             retval = 0;
 396             goto finish;
 397
 398         case PA_CMD_DUMP_CONF: {
 399             s = pa_daemon_conf_dump(conf);
 400             fputs(s, stdout);
 401             pa_xfree(s);
 402             retval = 0;
 403             goto finish;
 404         }
 405
 406         case PA_CMD_HELP :
 407             pa_cmdline_help(argv[0]);
 408             retval = 0;
 409             goto finish;
 410
 411         case PA_CMD_VERSION :
 412             printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
 413             retval = 0;
 414             goto finish;
 415
 416         case PA_CMD_CHECK: {
 417             pid_t pid;
 418
 419             if (pa_pid_file_check_running(&pid) < 0) {
 420                 pa_log_info("daemon not running");
 421             } else {
 422                 pa_log_info("daemon running as PID %u", pid);
 423                 retval = 0;
 424             }
 425
 426             goto finish;
 427
 428         }
 429         case PA_CMD_KILL:
 430
 431             if (pa_pid_file_kill(SIGINT, NULL) < 0)
 432                 pa_log("failed to kill daemon.");
 433             else
 434                 retval = 0;
 435
 436             goto finish;
 437
 438         default:
 439             assert(conf->cmd == PA_CMD_DAEMON);
 440     }
 441
 442     if (real_root && !conf->system_instance) {
 443         pa_log_warn("This program is not intended to be run as root (unless --system is specified).");
 444     } else if (!real_root && conf->system_instance) {
 445         pa_log("Root priviliges required.");
 446         goto finish;
 447     }
 448
 449     if (conf->daemonize) {
 450         pid_t child;
 451         int tty_fd;
 452
 453         if (pa_stdio_acquire() < 0) {
 454             pa_log("failed to acquire stdio.");
 455             goto finish;
 456         }
 457
 458 #ifdef HAVE_FORK
 459         if (pipe(daemon_pipe) < 0) {
 460             pa_log("failed to create pipe.");
 461             goto finish;
 462         }
 463
 464         if ((child = fork()) < 0) {
 465             pa_log("fork() failed: %s", pa_cstrerror(errno));
 466             goto finish;
 467         }
 468
 469         if (child != 0) {
 470             /* Father */
 471
 472             close(daemon_pipe[1]);
 473             daemon_pipe[1] = -1;
 474
 475             if (pa_loop_read(daemon_pipe[0], &retval, sizeof(retval), NULL) != sizeof(retval)) {
 476                 pa_log("read() failed: %s", pa_cstrerror(errno));
 477                 retval = 1;
 478             }
 479
 480             if (retval)
 481                 pa_log("daemon startup failed.");
 482             else
 483                 pa_log_info("daemon startup successful.");
 484
 485             goto finish;
 486         }
 487
 488         close(daemon_pipe[0]);
 489         daemon_pipe[0] = -1;
 490 #endif
 491
 492         if (conf->auto_log_target)
 493             pa_log_set_target(PA_LOG_SYSLOG, NULL);
 494
 495 #ifdef HAVE_SETSID
 496         setsid();
 497 #endif
 498 #ifdef HAVE_SETPGID
 499         setpgid(0,0);
 500 #endif
 501
 502 #ifndef OS_IS_WIN32
 503         close(0);
 504         close(1);
 505         close(2);
 506
 507         open("/dev/null", O_RDONLY);
 508         open("/dev/null", O_WRONLY);
 509         open("/dev/null", O_WRONLY);
 510 #else
 511         FreeConsole();
 512 #endif
 513
 514 #ifdef SIGTTOU
 515         signal(SIGTTOU, SIG_IGN);
 516 #endif
 517 #ifdef SIGTTIN
 518         signal(SIGTTIN, SIG_IGN);
 519 #endif
 520 #ifdef SIGTSTP
 521         signal(SIGTSTP, SIG_IGN);
 522 #endif
 523
 524 #ifdef TIOCNOTTY
 525         if ((tty_fd = open("/dev/tty", O_RDWR)) >= 0) {
 526             ioctl(tty_fd, TIOCNOTTY, (char*) 0);
 527             close(tty_fd);
 528         }
 529 #endif
 530     }
 531
 532     chdir("/");
 533     umask(0022);
 534
 535     if (conf->system_instance) {
 536         if (change_user() < 0)
 537             goto finish;
 538     } else if (create_runtime_dir() < 0)
 539         goto finish;
 540
 541     if (conf->use_pid_file) {
 542         if (pa_pid_file_create() < 0) {
 543             pa_log("pa_pid_file_create() failed.");
 544 #ifdef HAVE_FORK
 545             if (conf->daemonize)
 546                 pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 547 #endif
 548             goto finish;
 549         }
 550
 551         valid_pid_file = 1;
 552     }
 553
 554 #ifdef HAVE_SYS_RESOURCE_H
 555     set_all_rlimits(conf);
 556 #endif
 557
 558 #ifdef SIGPIPE
 559     signal(SIGPIPE, SIG_IGN);
 560 #endif
 561
 562     mainloop = pa_mainloop_new();
 563     assert(mainloop);
 564
 565     if (!(c = pa_core_new(pa_mainloop_get_api(mainloop), !conf->disable_shm))) {
 566         pa_log("pa_core_new() failed.");
 567         goto finish;
 568     }
 569
 570     c->is_system_instance = !!conf->system_instance;
 571
 572     r = pa_signal_init(pa_mainloop_get_api(mainloop));
 573     assert(r == 0);
 574     pa_signal_new(SIGINT, signal_callback, c);
 575     pa_signal_new(SIGTERM, signal_callback, c);
 576
 577 #ifdef SIGUSR1
 578     pa_signal_new(SIGUSR1, signal_callback, c);
 579 #endif
 580 #ifdef SIGUSR2
 581     pa_signal_new(SIGUSR2, signal_callback, c);
 582 #endif
 583 #ifdef SIGHUP
 584     pa_signal_new(SIGHUP, signal_callback, c);
 585 #endif
 586
 587 #ifdef OS_IS_WIN32
 588     timer = pa_mainloop_get_api(mainloop)->time_new(
 589         pa_mainloop_get_api(mainloop), pa_gettimeofday(&tv), message_cb, NULL);
 590     assert(timer);
 591 #endif
 592
 593     if (conf->daemonize)
 594         c->running_as_daemon = 1;
 595
 596     oil_init();
 597
 598     if (!conf->no_cpu_limit) {
 599         r = pa_cpu_limit_init(pa_mainloop_get_api(mainloop));
 600         assert(r == 0);
 601     }
 602
 603     buf = pa_strbuf_new();
 604     if (conf->default_script_file)
 605         r = pa_cli_command_execute_file(c, conf->default_script_file, buf, &conf->fail);
 606
 607     if (r >= 0)
 608         r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail);
 609     pa_log_error("%s", s = pa_strbuf_tostring_free(buf));
 610     pa_xfree(s);
 611
 612     if (r < 0 && conf->fail) {
 613         pa_log("failed to initialize daemon.");
 614 #ifdef HAVE_FORK
 615         if (conf->daemonize)
 616             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 617 #endif
 618     } else if (!c->modules || pa_idxset_size(c->modules) == 0) {
 619         pa_log("daemon startup without any loaded modules, refusing to work.");
 620 #ifdef HAVE_FORK
 621         if (conf->daemonize)
 622             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 623 #endif
 624     } else {
 625
 626         retval = 0;
 627 #ifdef HAVE_FORK
 628         if (conf->daemonize)
 629             pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
 630 #endif
 631
 632         c->disallow_module_loading = conf->disallow_module_loading;
 633         c->exit_idle_time = conf->exit_idle_time;
 634         c->module_idle_time = conf->module_idle_time;
 635         c->scache_idle_time = conf->scache_idle_time;
 636         c->resample_method = conf->resample_method;
 637
 638         if (c->default_sink_name &&
 639             pa_namereg_get(c, c->default_sink_name, PA_NAMEREG_SINK, 1) == NULL) {
 640             pa_log_error("%s : Fatal error. Default sink name (%s) does not exist in name register.", __FILE__, c->default_sink_name);
 641             retval = 1;
 642         } else {
 643             pa_log_info("Daemon startup complete.");
 644             if (pa_mainloop_run(mainloop, &retval) < 0)
 645                 retval = 1;
 646             pa_log_info("Daemon shutdown initiated.");
 647         }
 648     }
 649
 650 #ifdef OS_IS_WIN32
 651     pa_mainloop_get_api(mainloop)->time_free(timer);
 652 #endif
 653
 654     pa_core_free(c);
 655
 656     if (!conf->no_cpu_limit)
 657         pa_cpu_limit_done();
 658
 659     pa_signal_done();
 660
 661     pa_log_info("Daemon terminated.");
 662
 663 finish:
 664
 665     if (mainloop)
 666         pa_mainloop_free(mainloop);
 667
 668     if (conf)
 669         pa_daemon_conf_free(conf);
 670
 671     if (valid_pid_file)
 672         pa_pid_file_remove();
 673
 674     close_pipe(daemon_pipe);
 675
 676 #ifdef OS_IS_WIN32
 677     WSACleanup();
 678 #endif
 679
 680     lt_dlexit();
 681
 682     return retval;
 683 }