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

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   6
   7   PulseAudio is free software; you can redistribute it and/or modify
   8   it under the terms of the GNU Lesser General Public License as published
   9   by the Free Software Foundation; either version 2.1 of the License,
  10   or (at your option) any later version.
  11
  12   PulseAudio is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with PulseAudio; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  20   USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <unistd.h>
  28 #include <errno.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <signal.h>
  33 #include <stddef.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
  41 #include <liboil/liboil.h>
  42
  43 #ifdef HAVE_SYS_IOCTL_H
  44 #include <sys/ioctl.h>
  45 #endif
  46
  47 #ifdef HAVE_PWD_H
  48 #include <pwd.h>
  49 #endif
  50 #ifdef HAVE_GRP_H
  51 #include <grp.h>
  52 #endif
  53
  54 #ifdef HAVE_LIBWRAP
  55 #include <syslog.h>
  56 #include <tcpd.h>
  57 #endif
  58
  59 #ifdef HAVE_DBUS
  60 #include <dbus/dbus.h>
  61 #endif
  62
  63 #include <pulse/mainloop.h>
  64 #include <pulse/mainloop-signal.h>
  65 #include <pulse/timeval.h>
  66 #include <pulse/xmalloc.h>
  67 #include <pulse/i18n.h>
  68
  69 #include <pulsecore/lock-autospawn.h>
  70 #include <pulsecore/winsock.h>
  71 #include <pulsecore/core-error.h>
  72 #include <pulsecore/core.h>
  73 #include <pulsecore/memblock.h>
  74 #include <pulsecore/module.h>
  75 #include <pulsecore/cli-command.h>
  76 #include <pulsecore/log.h>
  77 #include <pulsecore/core-util.h>
  78 #include <pulsecore/sioman.h>
  79 #include <pulsecore/cli-text.h>
  80 #include <pulsecore/pid.h>
  81 #include <pulsecore/namereg.h>
  82 #include <pulsecore/random.h>
  83 #include <pulsecore/rtsig.h>
  84 #include <pulsecore/rtclock.h>
  85 #include <pulsecore/macro.h>
  86 #include <pulsecore/mutex.h>
  87 #include <pulsecore/thread.h>
  88 #include <pulsecore/once.h>
  89 #include <pulsecore/shm.h>
  90 #ifdef HAVE_DBUS
  91 #include <pulsecore/dbus-shared.h>
  92 #endif
  93
  94 #include "cmdline.h"
  95 #include "cpulimit.h"
  96 #include "daemon-conf.h"
  97 #include "dumpmodules.h"
  98 #include "caps.h"
  99 #include "ltdl-bind-now.h"
 100 #include "polkit.h"
 101
 102 #ifdef HAVE_LIBWRAP
 103 /* Only one instance of these variables */
 104 int allow_severity = LOG_INFO;
 105 int deny_severity = LOG_WARNING;
 106 #endif
 107
 108 #ifdef HAVE_OSS
 109 /* padsp looks for this symbol in the running process and disables
 110  * itself if it finds it and it is set to 7 (which is actually a bit
 111  * mask). For details see padsp. */
 112 int __padsp_disabled__ = 7;
 113 #endif
 114
 115 #ifdef OS_IS_WIN32
 116
 117 static void message_cb(pa_mainloop_api*a, pa_time_event*e, const struct timeval *tv, void *userdata) {
 118     MSG msg;
 119     struct timeval tvnext;
 120
 121     while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
 122         if (msg.message == WM_QUIT)
 123             raise(SIGTERM);
 124         else {
 125             TranslateMessage(&msg);
 126             DispatchMessage(&msg);
 127         }
 128     }
 129
 130     pa_timeval_add(pa_gettimeofday(&tvnext), 100000);
 131     a->time_restart(e, &tvnext);
 132 }
 133
 134 #endif
 135
 136 static void signal_callback(pa_mainloop_api*m, pa_signal_event *e, int sig, void *userdata) {
 137     pa_log_info(_("Got signal %s."), pa_sig2str(sig));
 138
 139     switch (sig) {
 140 #ifdef SIGUSR1
 141         case SIGUSR1:
 142             pa_module_load(userdata, "module-cli", NULL);
 143             break;
 144 #endif
 145
 146 #ifdef SIGUSR2
 147         case SIGUSR2:
 148             pa_module_load(userdata, "module-cli-protocol-unix", NULL);
 149             break;
 150 #endif
 151
 152 #ifdef SIGHUP
 153         case SIGHUP: {
 154             char *c = pa_full_status_string(userdata);
 155             pa_log_notice("%s", c);
 156             pa_xfree(c);
 157             return;
 158         }
 159 #endif
 160
 161         case SIGINT:
 162         case SIGTERM:
 163         default:
 164             pa_log_info(_("Exiting."));
 165             m->quit(m, 1);
 166             break;
 167     }
 168 }
 169
 170 #if defined(HAVE_PWD_H) && defined(HAVE_GRP_H)
 171
 172 static int change_user(void) {
 173     struct passwd *pw;
 174     struct group * gr;
 175     int r;
 176
 177     /* This function is called only in system-wide mode. It creates a
 178      * runtime dir in /var/run/ with proper UID/GID and drops privs
 179      * afterwards. */
 180
 181     if (!(pw = getpwnam(PA_SYSTEM_USER))) {
 182         pa_log(_("Failed to find user '%s'."), PA_SYSTEM_USER);
 183         return -1;
 184     }
 185
 186     if (!(gr = getgrnam(PA_SYSTEM_GROUP))) {
 187         pa_log(_("Failed to find group '%s'."), PA_SYSTEM_GROUP);
 188         return -1;
 189     }
 190
 191     pa_log_info(_("Found user '%s' (UID %lu) and group '%s' (GID %lu)."),
 192                 PA_SYSTEM_USER, (unsigned long) pw->pw_uid,
 193                 PA_SYSTEM_GROUP, (unsigned long) gr->gr_gid);
 194
 195     if (pw->pw_gid != gr->gr_gid) {
 196         pa_log(_("GID of user '%s' and of group '%s' don't match."), PA_SYSTEM_USER, PA_SYSTEM_GROUP);
 197         return -1;
 198     }
 199
 200     if (strcmp(pw->pw_dir, PA_SYSTEM_RUNTIME_PATH) != 0)
 201         pa_log_warn(_("Home directory of user '%s' is not '%s', ignoring."), PA_SYSTEM_USER, PA_SYSTEM_RUNTIME_PATH);
 202
 203     if (pa_make_secure_dir(PA_SYSTEM_RUNTIME_PATH, 0755, pw->pw_uid, gr->gr_gid) < 0) {
 204         pa_log(_("Failed to create '%s': %s"), PA_SYSTEM_RUNTIME_PATH, pa_cstrerror(errno));
 205         return -1;
 206     }
 207
 208     if (pa_make_secure_dir(PA_SYSTEM_STATE_PATH, 0700, pw->pw_uid, gr->gr_gid) < 0) {
 209         pa_log(_("Failed to create '%s': %s"), PA_SYSTEM_STATE_PATH, pa_cstrerror(errno));
 210         return -1;
 211     }
 212
 213     /* We don't create the config dir here, because we don't need to write to it */
 214
 215     if (initgroups(PA_SYSTEM_USER, gr->gr_gid) != 0) {
 216         pa_log(_("Failed to change group list: %s"), pa_cstrerror(errno));
 217         return -1;
 218     }
 219
 220 #if defined(HAVE_SETRESGID)
 221     r = setresgid(gr->gr_gid, gr->gr_gid, gr->gr_gid);
 222 #elif defined(HAVE_SETEGID)
 223     if ((r = setgid(gr->gr_gid)) >= 0)
 224         r = setegid(gr->gr_gid);
 225 #elif defined(HAVE_SETREGID)
 226     r = setregid(gr->gr_gid, gr->gr_gid);
 227 #else
 228 #error "No API to drop privileges"
 229 #endif
 230
 231     if (r < 0) {
 232         pa_log(_("Failed to change GID: %s"), pa_cstrerror(errno));
 233         return -1;
 234     }
 235
 236 #if defined(HAVE_SETRESUID)
 237     r = setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid);
 238 #elif defined(HAVE_SETEUID)
 239     if ((r = setuid(pw->pw_uid)) >= 0)
 240         r = seteuid(pw->pw_uid);
 241 #elif defined(HAVE_SETREUID)
 242     r = setreuid(pw->pw_uid, pw->pw_uid);
 243 #else
 244 #error "No API to drop privileges"
 245 #endif
 246
 247     if (r < 0) {
 248         pa_log(_("Failed to change UID: %s"), pa_cstrerror(errno));
 249         return -1;
 250     }
 251
 252     pa_set_env("USER", PA_SYSTEM_USER);
 253     pa_set_env("USERNAME", PA_SYSTEM_USER);
 254     pa_set_env("LOGNAME", PA_SYSTEM_USER);
 255     pa_set_env("HOME", PA_SYSTEM_RUNTIME_PATH);
 256
 257     /* Relevant for pa_runtime_path() */
 258     pa_set_env("PULSE_RUNTIME_PATH", PA_SYSTEM_RUNTIME_PATH);
 259     pa_set_env("PULSE_CONFIG_PATH", PA_SYSTEM_CONFIG_PATH);
 260     pa_set_env("PULSE_STATE_PATH", PA_SYSTEM_STATE_PATH);
 261
 262     pa_log_info(_("Successfully dropped root privileges."));
 263
 264     return 0;
 265 }
 266
 267 #else /* HAVE_PWD_H && HAVE_GRP_H */
 268
 269 static int change_user(void) {
 270     pa_log(_("System wide mode unsupported on this platform."));
 271     return -1;
 272 }
 273
 274 #endif /* HAVE_PWD_H && HAVE_GRP_H */
 275
 276 #ifdef HAVE_SYS_RESOURCE_H
 277
 278 static int set_one_rlimit(const pa_rlimit *r, int resource, const char *name) {
 279     struct rlimit rl;
 280     pa_assert(r);
 281
 282     if (!r->is_set)
 283         return 0;
 284
 285     rl.rlim_cur = rl.rlim_max = r->value;
 286
 287     if (setrlimit(resource, &rl) < 0) {
 288         pa_log_info(_("setrlimit(%s, (%u, %u)) failed: %s"), name, (unsigned) r->value, (unsigned) r->value, pa_cstrerror(errno));
 289         return -1;
 290     }
 291
 292     return 0;
 293 }
 294
 295 static void set_all_rlimits(const pa_daemon_conf *conf) {
 296     set_one_rlimit(&conf->rlimit_fsize, RLIMIT_FSIZE, "RLIMIT_FSIZE");
 297     set_one_rlimit(&conf->rlimit_data, RLIMIT_DATA, "RLIMIT_DATA");
 298     set_one_rlimit(&conf->rlimit_stack, RLIMIT_STACK, "RLIMIT_STACK");
 299     set_one_rlimit(&conf->rlimit_core, RLIMIT_CORE, "RLIMIT_CORE");
 300 #ifdef RLIMIT_RSS
 301     set_one_rlimit(&conf->rlimit_rss, RLIMIT_RSS, "RLIMIT_RSS");
 302 #endif
 303 #ifdef RLIMIT_NPROC
 304     set_one_rlimit(&conf->rlimit_nproc, RLIMIT_NPROC, "RLIMIT_NPROC");
 305 #endif
 306 #ifdef RLIMIT_NOFILE
 307     set_one_rlimit(&conf->rlimit_nofile, RLIMIT_NOFILE, "RLIMIT_NOFILE");
 308 #endif
 309 #ifdef RLIMIT_MEMLOCK
 310     set_one_rlimit(&conf->rlimit_memlock, RLIMIT_MEMLOCK, "RLIMIT_MEMLOCK");
 311 #endif
 312 #ifdef RLIMIT_AS
 313     set_one_rlimit(&conf->rlimit_as, RLIMIT_AS, "RLIMIT_AS");
 314 #endif
 315 #ifdef RLIMIT_LOCKS
 316     set_one_rlimit(&conf->rlimit_locks, RLIMIT_LOCKS, "RLIMIT_LOCKS");
 317 #endif
 318 #ifdef RLIMIT_SIGPENDING
 319     set_one_rlimit(&conf->rlimit_sigpending, RLIMIT_SIGPENDING, "RLIMIT_SIGPENDING");
 320 #endif
 321 #ifdef RLIMIT_MSGQUEUE
 322     set_one_rlimit(&conf->rlimit_msgqueue, RLIMIT_MSGQUEUE, "RLIMIT_MSGQUEUE");
 323 #endif
 324 #ifdef RLIMIT_NICE
 325     set_one_rlimit(&conf->rlimit_nice, RLIMIT_NICE, "RLIMIT_NICE");
 326 #endif
 327 #ifdef RLIMIT_RTPRIO
 328     set_one_rlimit(&conf->rlimit_rtprio, RLIMIT_RTPRIO, "RLIMIT_RTPRIO");
 329 #endif
 330 #ifdef RLIMIT_RTTIME
 331     set_one_rlimit(&conf->rlimit_rttime, RLIMIT_RTTIME, "RLIMIT_RTTIME");
 332 #endif
 333 }
 334 #endif
 335
 336 #ifdef HAVE_DBUS
 337 static void register_org_pulseaudio(pa_core *c)
 338 {
 339     DBusError error;
 340     pa_dbus_connection *conn;
 341
 342     dbus_error_init(&error);
 343     if (!(conn = pa_dbus_bus_get(c, pa_in_system_mode() ? DBUS_BUS_SYSTEM : DBUS_BUS_SESSION, &error)) || dbus_error_is_set(&error)) {
 344         pa_log_warn("Unable to contact DBUS: %s: %s", error.name, error.message);
 345         goto finish_dbus;
 346     }
 347
 348     if (dbus_bus_request_name (pa_dbus_connection_get(conn), "org.pulseaudio", 0, &error) == DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER)
 349         pa_log_debug("Got org.pulseaudio!");
 350     else if (dbus_error_is_set(&error))
 351         pa_log_warn("Unable to get org.pulseaudio: %s: %s", error.name, error.message);
 352
 353 finish_dbus:
 354     if (conn)
 355         pa_dbus_connection_unref(conn);
 356
 357     dbus_error_free(&error);
 358 }
 359 #endif
 360
 361 int main(int argc, char *argv[]) {
 362     pa_core *c = NULL;
 363     pa_strbuf *buf = NULL;
 364     pa_daemon_conf *conf = NULL;
 365     pa_mainloop *mainloop = NULL;
 366     char *s;
 367     int r = 0, retval = 1, d = 0;
 368     pa_bool_t suid_root, real_root;
 369     pa_bool_t valid_pid_file = FALSE;
 370     gid_t gid = (gid_t) -1;
 371     pa_bool_t ltdl_init = FALSE;
 372     int passed_fd = -1;
 373     const char *e;
 374 #ifdef HAVE_FORK
 375     int daemon_pipe[2] = { -1, -1 };
 376 #endif
 377 #ifdef OS_IS_WIN32
 378     pa_time_event *win32_timer;
 379     struct timeval win32_tv;
 380 #endif
 381     int autospawn_fd = -1;
 382     pa_bool_t autospawn_locked = FALSE;
 383
 384     pa_log_set_ident("pulseaudio");
 385     pa_log_set_level(PA_LOG_INFO);
 386     pa_log_set_flags(PA_LOG_COLORS|PA_LOG_PRINT_FILE|PA_LOG_PRINT_LEVEL, PA_LOG_RESET);
 387
 388 #if defined(__linux__) && defined(__OPTIMIZE__)
 389     /*
 390        Disable lazy relocations to make usage of external libraries
 391        more deterministic for our RT threads. We abuse __OPTIMIZE__ as
 392        a check whether we are a debug build or not.
 393     */
 394
 395     if (!getenv("LD_BIND_NOW")) {
 396         char *rp;
 397
 398         /* We have to execute ourselves, because the libc caches the
 399          * value of $LD_BIND_NOW on initialization. */
 400
 401         pa_set_env("LD_BIND_NOW", "1");
 402
 403         if ((rp = pa_readlink("/proc/self/exe")))
 404             pa_assert_se(execv(rp, argv) == 0);
 405         else
 406             pa_log_warn("Couldn't read /proc/self/exe, cannot self execute. Running in a chroot()?");
 407     }
 408 #endif
 409
 410 #ifdef HAVE_GETUID
 411     real_root = getuid() == 0;
 412     suid_root = !real_root && geteuid() == 0;
 413 #else
 414     real_root = FALSE;
 415     suid_root = FALSE;
 416 #endif
 417
 418     if (!real_root) {
 419         /* Drop all capabilities except CAP_SYS_NICE  */
 420         pa_limit_caps();
 421
 422         /* Drop privileges, but keep CAP_SYS_NICE */
 423         pa_drop_root();
 424
 425         /* After dropping root, the effective set is reset, hence,
 426          * let's raise it again */
 427         pa_limit_caps();
 428
 429         /* When capabilities are not supported we will not be able to
 430          * aquire RT sched anymore. But yes, that's the way it is. It
 431          * is just too risky tun let PA run as root all the time. */
 432     }
 433
 434     if ((e = getenv("PULSE_PASSED_FD"))) {
 435         passed_fd = atoi(e);
 436
 437         if (passed_fd <= 2)
 438             passed_fd = -1;
 439     }
 440
 441     pa_close_all(passed_fd, -1);
 442
 443     pa_reset_sigs(-1);
 444     pa_unblock_sigs(-1);
 445
 446     /* At this point, we are a normal user, possibly with CAP_NICE if
 447      * we were started SUID. If we are started as normal root, than we
 448      * still are normal root. */
 449
 450     setlocale(LC_ALL, "");
 451     pa_init_i18n();
 452
 453     conf = pa_daemon_conf_new();
 454
 455     if (pa_daemon_conf_load(conf, NULL) < 0)
 456         goto finish;
 457
 458     if (pa_daemon_conf_env(conf) < 0)
 459         goto finish;
 460
 461     if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
 462         pa_log(_("Failed to parse command line."));
 463         goto finish;
 464     }
 465
 466     pa_log_set_level(conf->log_level);
 467     pa_log_set_target(conf->auto_log_target ? PA_LOG_STDERR : conf->log_target);
 468     if (conf->log_meta)
 469         pa_log_set_flags(PA_LOG_PRINT_META, PA_LOG_SET);
 470     if (conf->log_time)
 471         pa_log_set_flags(PA_LOG_PRINT_TIME, PA_LOG_SET);
 472     pa_log_set_show_backtrace(conf->log_backtrace);
 473
 474     pa_log_debug("Started as real root: %s, suid root: %s", pa_yes_no(real_root), pa_yes_no(suid_root));
 475
 476     if (!real_root && pa_have_caps()) {
 477 #ifdef HAVE_SYS_RESOURCE_H
 478         struct rlimit rl;
 479 #endif
 480         pa_bool_t allow_high_priority = FALSE, allow_realtime = FALSE;
 481
 482         /* Let's better not enable high prio or RT by default */
 483
 484         if (conf->high_priority && !allow_high_priority) {
 485             if (pa_own_uid_in_group(PA_REALTIME_GROUP, &gid) > 0) {
 486                 pa_log_info(_("We're in the group '%s', allowing high-priority scheduling."), PA_REALTIME_GROUP);
 487                 allow_high_priority = TRUE;
 488             }
 489         }
 490
 491         if (conf->realtime_scheduling && !allow_realtime) {
 492             if (pa_own_uid_in_group(PA_REALTIME_GROUP, &gid) > 0) {
 493                 pa_log_info(_("We're in the group '%s', allowing real-time scheduling."), PA_REALTIME_GROUP);
 494                 allow_realtime = TRUE;
 495             }
 496         }
 497
 498 #ifdef HAVE_POLKIT
 499         if (conf->high_priority && !allow_high_priority) {
 500             if (pa_polkit_check("org.pulseaudio.acquire-high-priority") > 0) {
 501                 pa_log_info(_("PolicyKit grants us acquire-high-priority privilege."));
 502                 allow_high_priority = TRUE;
 503             } else
 504                 pa_log_info(_("PolicyKit refuses acquire-high-priority privilege."));
 505         }
 506
 507         if (conf->realtime_scheduling && !allow_realtime) {
 508             if (pa_polkit_check("org.pulseaudio.acquire-real-time") > 0) {
 509                 pa_log_info(_("PolicyKit grants us acquire-real-time privilege."));
 510                 allow_realtime = TRUE;
 511             } else
 512                 pa_log_info(_("PolicyKit refuses acquire-real-time privilege."));
 513         }
 514 #endif
 515
 516         if (!allow_high_priority && !allow_realtime) {
 517
 518             /* OK, there's no further need to keep CAP_NICE. Hence
 519              * let's give it up early */
 520
 521             pa_drop_caps();
 522         }
 523
 524 #ifdef RLIMIT_RTPRIO
 525         if (getrlimit(RLIMIT_RTPRIO, &rl) >= 0)
 526             if (rl.rlim_cur > 0) {
 527                 pa_log_info("RLIMIT_RTPRIO is set to %u, allowing real-time scheduling.", (unsigned) rl.rlim_cur);
 528                 allow_realtime = TRUE;
 529             }
 530 #endif
 531 #ifdef RLIMIT_NICE
 532         if (getrlimit(RLIMIT_NICE, &rl) >= 0)
 533             if (rl.rlim_cur > 20 ) {
 534                 pa_log_info("RLIMIT_NICE is set to %u, allowing high-priority scheduling.", (unsigned) rl.rlim_cur);
 535                 allow_high_priority = TRUE;
 536             }
 537 #endif
 538
 539         if ((conf->high_priority && !allow_high_priority) ||
 540             (conf->realtime_scheduling && !allow_realtime))
 541             pa_log_notice(_("Called SUID root and real-time and/or high-priority scheduling was requested in the configuration. However, we lack the necessary privileges:\n"
 542                             "We are not in group '%s', PolicyKit refuse to grant us the requested privileges and we have no increase RLIMIT_NICE/RLIMIT_RTPRIO resource limits.\n"
 543                             "For enabling real-time/high-priority scheduling please acquire the appropriate PolicyKit privileges, or become a member of '%s', or increase the RLIMIT_NICE/RLIMIT_RTPRIO resource limits for this user."),
 544                           PA_REALTIME_GROUP, PA_REALTIME_GROUP);
 545
 546
 547         if (!allow_realtime)
 548             conf->realtime_scheduling = FALSE;
 549
 550         if (!allow_high_priority)
 551             conf->high_priority = FALSE;
 552     }
 553
 554 #ifdef HAVE_SYS_RESOURCE_H
 555     /* Reset resource limits. If we are run as root (for system mode)
 556      * this might end up increasing the limits, which is intended
 557      * behaviour. For all other cases, i.e. started as normal user, or
 558      * SUID root at this point we should have no CAP_SYS_RESOURCE and
 559      * increasing the limits thus should fail. Which is, too, intended
 560      * behaviour */
 561
 562     set_all_rlimits(conf);
 563 #endif
 564
 565     if (conf->high_priority && !pa_can_high_priority()) {
 566         pa_log_warn(_("High-priority scheduling enabled in configuration but not allowed by policy."));
 567         conf->high_priority = FALSE;
 568     }
 569
 570     if (conf->high_priority && (conf->cmd == PA_CMD_DAEMON || conf->cmd == PA_CMD_START))
 571         pa_raise_priority(conf->nice_level);
 572
 573     pa_log_debug("Can realtime: %s, can high-priority: %s", pa_yes_no(pa_can_realtime()), pa_yes_no(pa_can_high_priority()));
 574
 575     if (!real_root && pa_have_caps()) {
 576         pa_bool_t drop;
 577
 578         drop = (conf->cmd != PA_CMD_DAEMON && conf->cmd != PA_CMD_START) || !conf->realtime_scheduling;
 579
 580 #ifdef RLIMIT_RTPRIO
 581         if (!drop) {
 582             struct rlimit rl;
 583             /* At this point we still have CAP_NICE if we were loaded
 584              * SUID root. If possible let's acquire RLIMIT_RTPRIO
 585              * instead and give CAP_NICE up. */
 586
 587             if (getrlimit(RLIMIT_RTPRIO, &rl) >= 0) {
 588
 589                 if (rl.rlim_cur >= 9)
 590                     drop = TRUE;
 591                 else {
 592                     rl.rlim_max = rl.rlim_cur = 9;
 593
 594                     if (setrlimit(RLIMIT_RTPRIO, &rl) >= 0) {
 595                         pa_log_info(_("Successfully increased RLIMIT_RTPRIO"));
 596                         drop = TRUE;
 597                     } else
 598                         pa_log_warn(_("RLIMIT_RTPRIO failed: %s"), pa_cstrerror(errno));
 599                 }
 600             }
 601         }
 602 #endif
 603
 604         if (drop)  {
 605             pa_log_info(_("Giving up CAP_NICE"));
 606             pa_drop_caps();
 607             suid_root = FALSE;
 608         }
 609     }
 610
 611     if (conf->realtime_scheduling && !pa_can_realtime()) {
 612         pa_log_warn(_("Real-time scheduling enabled in configuration but not allowed by policy."));
 613         conf->realtime_scheduling = FALSE;
 614     }
 615
 616     pa_log_debug("Can realtime: %s, can high-priority: %s", pa_yes_no(pa_can_realtime()), pa_yes_no(pa_can_high_priority()));
 617
 618     LTDL_SET_PRELOADED_SYMBOLS();
 619     pa_ltdl_init();
 620     ltdl_init = TRUE;
 621
 622     if (conf->dl_search_path)
 623         lt_dlsetsearchpath(conf->dl_search_path);
 624
 625 #ifdef OS_IS_WIN32
 626     {
 627         WSADATA data;
 628         WSAStartup(MAKEWORD(2, 0), &data);
 629     }
 630 #endif
 631
 632     pa_random_seed();
 633
 634     switch (conf->cmd) {
 635         case PA_CMD_DUMP_MODULES:
 636             pa_dump_modules(conf, argc-d, argv+d);
 637             retval = 0;
 638             goto finish;
 639
 640         case PA_CMD_DUMP_CONF: {
 641             s = pa_daemon_conf_dump(conf);
 642             fputs(s, stdout);
 643             pa_xfree(s);
 644             retval = 0;
 645             goto finish;
 646         }
 647
 648         case PA_CMD_DUMP_RESAMPLE_METHODS: {
 649             int i;
 650
 651             for (i = 0; i < PA_RESAMPLER_MAX; i++)
 652                 if (pa_resample_method_supported(i))
 653                     printf("%s\n", pa_resample_method_to_string(i));
 654
 655             retval = 0;
 656             goto finish;
 657         }
 658
 659         case PA_CMD_HELP :
 660             pa_cmdline_help(argv[0]);
 661             retval = 0;
 662             goto finish;
 663
 664         case PA_CMD_VERSION :
 665             printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
 666             retval = 0;
 667             goto finish;
 668
 669         case PA_CMD_CHECK: {
 670             pid_t pid;
 671
 672             if (pa_pid_file_check_running(&pid, "pulseaudio") < 0)
 673                 pa_log_info(_("Daemon not running"));
 674             else {
 675                 pa_log_info(_("Daemon running as PID %u"), pid);
 676                 retval = 0;
 677             }
 678
 679             goto finish;
 680
 681         }
 682         case PA_CMD_KILL:
 683
 684             if (pa_pid_file_kill(SIGINT, NULL, "pulseaudio") < 0)
 685                 pa_log(_("Failed to kill daemon: %s"), pa_cstrerror(errno));
 686             else
 687                 retval = 0;
 688
 689             goto finish;
 690
 691         case PA_CMD_CLEANUP_SHM:
 692
 693             if (pa_shm_cleanup() >= 0)
 694                 retval = 0;
 695
 696             goto finish;
 697
 698         default:
 699             pa_assert(conf->cmd == PA_CMD_DAEMON || conf->cmd == PA_CMD_START);
 700     }
 701
 702     if (real_root && !conf->system_instance)
 703         pa_log_warn(_("This program is not intended to be run as root (unless --system is specified)."));
 704     else if (!real_root && conf->system_instance) {
 705         pa_log(_("Root privileges required."));
 706         goto finish;
 707     }
 708
 709     if (conf->cmd == PA_CMD_START && conf->system_instance) {
 710         pa_log(_("--start not supported for system instances."));
 711         goto finish;
 712     }
 713
 714     if (conf->system_instance && !conf->disallow_exit)
 715         pa_log_warn(_("Running in system mode, but --disallow-exit not set!"));
 716
 717     if (conf->system_instance && !conf->disallow_module_loading)
 718         pa_log_warn(_("Running in system mode, but --disallow-module-loading not set!"));
 719
 720     if (conf->system_instance && !conf->disable_shm) {
 721         pa_log_notice(_("Running in system mode, forcibly disabling SHM mode!"));
 722         conf->disable_shm = TRUE;
 723     }
 724
 725     if (conf->system_instance && conf->exit_idle_time >= 0) {
 726         pa_log_notice(_("Running in system mode, forcibly disabling exit idle time!"));
 727         conf->exit_idle_time = -1;
 728     }
 729
 730     if (conf->cmd == PA_CMD_START) {
 731         /* If we shall start PA only when it is not running yet, we
 732          * first take the autospawn lock to make things
 733          * synchronous. */
 734
 735         if ((autospawn_fd = pa_autospawn_lock_init()) < 0) {
 736             pa_log("Failed to initialize autospawn lock");
 737             goto finish;
 738         }
 739
 740         if ((pa_autospawn_lock_acquire(TRUE) < 0)) {
 741             pa_log("Failed to acquire autospawn lock");
 742             goto finish;
 743         }
 744
 745         autospawn_locked = TRUE;
 746     }
 747
 748     if (conf->daemonize) {
 749         pid_t child;
 750         int tty_fd;
 751
 752         if (pa_stdio_acquire() < 0) {
 753             pa_log(_("Failed to acquire stdio."));
 754             goto finish;
 755         }
 756
 757 #ifdef HAVE_FORK
 758         if (pipe(daemon_pipe) < 0) {
 759             pa_log(_("pipe failed: %s"), pa_cstrerror(errno));
 760             goto finish;
 761         }
 762
 763         if ((child = fork()) < 0) {
 764             pa_log(_("fork() failed: %s"), pa_cstrerror(errno));
 765             goto finish;
 766         }
 767
 768         if (child != 0) {
 769             ssize_t n;
 770             /* Father */
 771
 772             pa_assert_se(pa_close(daemon_pipe[1]) == 0);
 773             daemon_pipe[1] = -1;
 774
 775             if ((n = pa_loop_read(daemon_pipe[0], &retval, sizeof(retval), NULL)) != sizeof(retval)) {
 776
 777                 if (n < 0)
 778                     pa_log(_("read() failed: %s"), pa_cstrerror(errno));
 779
 780                 retval = 1;
 781             }
 782
 783             if (retval)
 784                 pa_log(_("Daemon startup failed."));
 785             else
 786                 pa_log_info(_("Daemon startup successful."));
 787
 788             goto finish;
 789         }
 790
 791         if (autospawn_fd >= 0) {
 792             /* The lock file is unlocked from the parent, so we need
 793              * to close it in the child */
 794
 795             pa_autospawn_lock_release();
 796             pa_autospawn_lock_done(TRUE);
 797
 798             autospawn_locked = FALSE;
 799             autospawn_fd = -1;
 800         }
 801
 802         pa_assert_se(pa_close(daemon_pipe[0]) == 0);
 803         daemon_pipe[0] = -1;
 804 #endif
 805
 806         if (conf->auto_log_target)
 807             pa_log_set_target(PA_LOG_SYSLOG);
 808
 809 #ifdef HAVE_SETSID
 810         setsid();
 811 #endif
 812 #ifdef HAVE_SETPGID
 813         setpgid(0,0);
 814 #endif
 815
 816 #ifndef OS_IS_WIN32
 817         pa_close(0);
 818         pa_close(1);
 819         pa_close(2);
 820
 821         pa_assert_se(open("/dev/null", O_RDONLY) == 0);
 822         pa_assert_se(open("/dev/null", O_WRONLY) == 1);
 823         pa_assert_se(open("/dev/null", O_WRONLY) == 2);
 824 #else
 825         FreeConsole();
 826 #endif
 827
 828 #ifdef SIGTTOU
 829         signal(SIGTTOU, SIG_IGN);
 830 #endif
 831 #ifdef SIGTTIN
 832         signal(SIGTTIN, SIG_IGN);
 833 #endif
 834 #ifdef SIGTSTP
 835         signal(SIGTSTP, SIG_IGN);
 836 #endif
 837
 838 #ifdef TIOCNOTTY
 839         if ((tty_fd = open("/dev/tty", O_RDWR)) >= 0) {
 840             ioctl(tty_fd, TIOCNOTTY, (char*) 0);
 841             pa_assert_se(pa_close(tty_fd) == 0);
 842         }
 843 #endif
 844     }
 845
 846     pa_set_env("PULSE_INTERNAL", "1");
 847     pa_assert_se(chdir("/") == 0);
 848     umask(0022);
 849
 850     if (conf->system_instance)
 851         if (change_user() < 0)
 852             goto finish;
 853
 854     pa_set_env("PULSE_SYSTEM", conf->system_instance ? "1" : "0");
 855
 856     pa_log_info(_("This is PulseAudio %s"), PACKAGE_VERSION);
 857     pa_log_debug(_("Compilation host: %s"), CANONICAL_HOST);
 858     pa_log_debug(_("Compilation CFLAGS: %s"), PA_CFLAGS);
 859
 860     s = pa_uname_string();
 861     pa_log_debug(_("Running on host: %s"), s);
 862     pa_xfree(s);
 863
 864     pa_log_debug(_("Found %u CPUs."), pa_ncpus());
 865
 866     pa_log_info(_("Page size is %lu bytes"), (unsigned long) PA_PAGE_SIZE);
 867
 868 #ifdef HAVE_VALGRIND_MEMCHECK_H
 869     pa_log_debug(_("Compiled with Valgrind support: yes"));
 870 #else
 871     pa_log_debug(_("Compiled with Valgrind support: no"));
 872 #endif
 873
 874     pa_log_debug(_("Running in valgrind mode: %s"), pa_yes_no(pa_in_valgrind()));
 875
 876 #ifdef __OPTIMIZE__
 877     pa_log_debug(_("Optimized build: yes"));
 878 #else
 879     pa_log_debug(_("Optimized build: no"));
 880 #endif
 881
 882 #ifdef NDEBUG
 883     pa_log_debug(_("NDEBUG defined, all asserts disabled."));
 884 #elif defined(FASTPATH)
 885     pa_log_debug(_("FASTPATH defined, only fast path asserts disabled."));
 886 #else
 887     pa_log_debug(_("All asserts enabled."));
 888 #endif
 889
 890     if (!(s = pa_machine_id())) {
 891         pa_log(_("Failed to get machine ID"));
 892         goto finish;
 893     }
 894     pa_log_info(_("Machine ID is %s."), s);
 895     pa_xfree(s);
 896
 897     if (!(s = pa_get_runtime_dir()))
 898         goto finish;
 899     pa_log_info(_("Using runtime directory %s."), s);
 900     pa_xfree(s);
 901
 902     if (!(s = pa_get_state_dir()))
 903         goto finish;
 904     pa_log_info(_("Using state directory %s."), s);
 905     pa_xfree(s);
 906
 907     pa_log_info(_("Running in system mode: %s"), pa_yes_no(pa_in_system_mode()));
 908
 909     if (conf->use_pid_file) {
 910         int z;
 911
 912         if ((z = pa_pid_file_create("pulseaudio")) != 0) {
 913
 914             if (conf->cmd == PA_CMD_START && z > 0) {
 915                 /* If we are already running and with are run in
 916                  * --start mode, then let's return this as success. */
 917
 918                 retval = 0;
 919                 goto finish;
 920             }
 921
 922             pa_log(_("pa_pid_file_create() failed."));
 923             goto finish;
 924         }
 925
 926         valid_pid_file = TRUE;
 927     }
 928
 929 #ifdef SIGPIPE
 930     signal(SIGPIPE, SIG_IGN);
 931 #endif
 932
 933     if (pa_rtclock_hrtimer())
 934         pa_log_info(_("Fresh high-resolution timers available! Bon appetit!"));
 935     else
 936         pa_log_info(_("Dude, your kernel stinks! The chef's recommendation today is Linux with high-resolution timers enabled!"));
 937
 938     pa_rtclock_hrtimer_enable();
 939
 940 #ifdef SIGRTMIN
 941     /* Valgrind uses SIGRTMAX. To easy debugging we don't use it here */
 942     pa_rtsig_configure(SIGRTMIN, SIGRTMAX-1);
 943 #endif
 944
 945     pa_assert_se(mainloop = pa_mainloop_new());
 946
 947     if (!(c = pa_core_new(pa_mainloop_get_api(mainloop), !conf->disable_shm, conf->shm_size))) {
 948         pa_log(_("pa_core_new() failed."));
 949         goto finish;
 950     }
 951
 952     c->default_sample_spec = conf->default_sample_spec;
 953     c->default_channel_map = conf->default_channel_map;
 954     c->default_n_fragments = conf->default_n_fragments;
 955     c->default_fragment_size_msec = conf->default_fragment_size_msec;
 956     c->exit_idle_time = conf->exit_idle_time;
 957     c->scache_idle_time = conf->scache_idle_time;
 958     c->resample_method = conf->resample_method;
 959     c->realtime_priority = conf->realtime_priority;
 960     c->realtime_scheduling = !!conf->realtime_scheduling;
 961     c->disable_remixing = !!conf->disable_remixing;
 962     c->disable_lfe_remixing = !!conf->disable_lfe_remixing;
 963     c->running_as_daemon = !!conf->daemonize;
 964     c->disallow_exit = conf->disallow_exit;
 965     c->flat_volumes = conf->flat_volumes;
 966
 967     pa_assert_se(pa_signal_init(pa_mainloop_get_api(mainloop)) == 0);
 968     pa_signal_new(SIGINT, signal_callback, c);
 969     pa_signal_new(SIGTERM, signal_callback, c);
 970 #ifdef SIGUSR1
 971     pa_signal_new(SIGUSR1, signal_callback, c);
 972 #endif
 973 #ifdef SIGUSR2
 974     pa_signal_new(SIGUSR2, signal_callback, c);
 975 #endif
 976 #ifdef SIGHUP
 977     pa_signal_new(SIGHUP, signal_callback, c);
 978 #endif
 979
 980 #ifdef OS_IS_WIN32
 981     win32_timer = pa_mainloop_get_api(mainloop)->time_new(pa_mainloop_get_api(mainloop), pa_gettimeofday(&win32_tv), message_cb, NULL);
 982 #endif
 983
 984     oil_init();
 985
 986     if (!conf->no_cpu_limit)
 987         pa_assert_se(pa_cpu_limit_init(pa_mainloop_get_api(mainloop)) == 0);
 988
 989     buf = pa_strbuf_new();
 990     if (conf->load_default_script_file) {
 991         FILE *f;
 992
 993         if ((f = pa_daemon_conf_open_default_script_file(conf))) {
 994             r = pa_cli_command_execute_file_stream(c, f, buf, &conf->fail);
 995             fclose(f);
 996         }
 997     }
 998
 999     if (r >= 0)
1000         r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail);
1001
1002     pa_log_error("%s", s = pa_strbuf_tostring_free(buf));
1003     pa_xfree(s);
1004
1005     /* We completed the initial module loading, so let's disable it
1006      * from now on, if requested */
1007     c->disallow_module_loading = !!conf->disallow_module_loading;
1008
1009     if (r < 0 && conf->fail) {
1010         pa_log(_("Failed to initialize daemon."));
1011         goto finish;
1012     }
1013
1014     if (!c->modules || pa_idxset_size(c->modules) == 0) {
1015         pa_log(_("Daemon startup without any loaded modules, refusing to work."));
1016         goto finish;
1017     }
1018
1019 #ifdef HAVE_FORK
1020     if (daemon_pipe[1] >= 0) {
1021         int ok = 0;
1022         pa_loop_write(daemon_pipe[1], &ok, sizeof(ok), NULL);
1023         pa_close(daemon_pipe[1]);
1024         daemon_pipe[1] = -1;
1025     }
1026 #endif
1027
1028 #ifdef HAVE_DBUS
1029     register_org_pulseaudio(c);
1030 #endif
1031
1032     pa_log_info(_("Daemon startup complete."));
1033
1034     retval = 0;
1035     if (pa_mainloop_run(mainloop, &retval) < 0)
1036         goto finish;
1037
1038     pa_log_info(_("Daemon shutdown initiated."));
1039
1040 finish:
1041
1042     if (autospawn_fd >= 0) {
1043         if (autospawn_locked)
1044             pa_autospawn_lock_release();
1045
1046         pa_autospawn_lock_done(FALSE);
1047     }
1048
1049 #ifdef OS_IS_WIN32
1050     if (win32_timer)
1051         pa_mainloop_get_api(mainloop)->time_free(win32_timer);
1052 #endif
1053
1054     if (c) {
1055         pa_core_unref(c);
1056         pa_log_info(_("Daemon terminated."));
1057     }
1058
1059     if (!conf->no_cpu_limit)
1060         pa_cpu_limit_done();
1061
1062     pa_signal_done();
1063
1064 #ifdef HAVE_FORK
1065     if (daemon_pipe[1] >= 0)
1066         pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
1067
1068     pa_close_pipe(daemon_pipe);
1069 #endif
1070
1071     if (mainloop)
1072         pa_mainloop_free(mainloop);
1073
1074     if (conf)
1075         pa_daemon_conf_free(conf);
1076
1077     if (valid_pid_file)
1078         pa_pid_file_remove();
1079
1080 #ifdef OS_IS_WIN32
1081     WSACleanup();
1082 #endif
1083
1084     if (ltdl_init)
1085         pa_ltdl_done();
1086
1087 #ifdef HAVE_DBUS
1088     dbus_shutdown();
1089 #endif
1090
1091     return retval;
1092 }