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pulseaudio/src/daemon/main.c
Mohamed Akram a340404b01 daemon: fix crash when CoreAudio is enabled 
macOS frameworks cannot be used safely after forking without an exec.

Fixes: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/353
Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/819>
2024-05-04 02:59:50 +04:00

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/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <stddef.h>
#include <ltdl.h>
#include <limits.h>
#include <unistd.h>
#include <locale.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#ifdef HAVE_LIBWRAP
#include <syslog.h>
#include <tcpd.h>
#endif
#ifdef HAVE_DBUS
#include <dbus/dbus.h>
#endif
#ifdef HAVE_SYSTEMD_DAEMON
#include <systemd/sd-daemon.h>
#endif
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#include <aclapi.h>
#include <sddl.h>
#endif
#include <pulse/client-conf.h>
#include <pulse/mainloop.h>
#include <pulse/mainloop-signal.h>
#include <pulse/timeval.h>
#include <pulse/xmalloc.h>
#include <pulsecore/i18n.h>
#include <pulsecore/lock-autospawn.h>
#include <pulsecore/socket.h>
#include <pulsecore/core-error.h>
#include <pulsecore/core-rtclock.h>
#include <pulsecore/core-scache.h>
#include <pulsecore/core.h>
#include <pulsecore/module.h>
#include <pulsecore/cli-command.h>
#include <pulsecore/log.h>
#include <pulsecore/core-util.h>
#include <pulsecore/sioman.h>
#include <pulsecore/cli-text.h>
#include <pulsecore/pid.h>
#include <pulsecore/random.h>
#include <pulsecore/macro.h>
#include <pulsecore/shm.h>
#include <pulsecore/memtrap.h>
#include <pulsecore/strlist.h>
#ifdef HAVE_DBUS
#include <pulsecore/dbus-shared.h>
#endif
#include <pulsecore/cpu.h>
#include "cmdline.h"
#include "cpulimit.h"
#include "daemon-conf.h"
#include "dumpmodules.h"
#include "caps.h"
#include "ltdl-bind-now.h"
#include "server-lookup.h"
#ifdef DISABLE_LIBTOOL_PRELOAD
/* FIXME: work around a libtool bug by making sure we have 2 elements. Bug has
* been reported: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=29576 */
LT_DLSYM_CONST lt_dlsymlist lt_preloaded_symbols[] = {
{ "@PROGRAM@", NULL },
{ NULL, NULL }
};
#endif
#ifdef HAVE_LIBWRAP
/* Only one instance of these variables */
int allow_severity = LOG_INFO;
int deny_severity = LOG_WARNING;
#endif
#ifdef HAVE_OSS_WRAPPER
/* padsp looks for this symbol in the running process and disables
* itself if it finds it and it is set to 7 (which is actually a bit
* mask). For details see padsp. */
int __padsp_disabled__ = 7;
#endif
static void signal_callback(pa_mainloop_api* m, pa_signal_event *e, int sig, void *userdata) {
pa_module *module = NULL;
pa_log_info("Got signal %s.", pa_sig2str(sig));
switch (sig) {
#ifdef SIGUSR1
case SIGUSR1:
pa_module_load(&module, userdata, "module-cli", NULL);
break;
#endif
#ifdef SIGUSR2
case SIGUSR2:
pa_module_load(&module, userdata, "module-cli-protocol-unix", NULL);
break;
#endif
#ifdef SIGHUP
case SIGHUP: {
char *c = pa_full_status_string(userdata);
pa_log_notice("%s", c);
pa_xfree(c);
return;
}
#endif
case SIGINT:
case SIGTERM:
default:
pa_log_info("Exiting.");
m->quit(m, 0);
break;
}
}
#if defined(OS_IS_WIN32)
static int change_user(void) {
pa_log_info("Overriding system runtime/config base dir to '%s'.", pa_win32_get_system_appdata());
/* On other platforms, these paths are compiled into PulseAudio. This isn't
* suitable on Windows. Firstly, Windows doesn't follow the FHS or use Unix
* paths and the build system can't handle Windows-style paths properly.
* Secondly, the idiomatic location for a service's state and shared data is
* ProgramData, and the location of special folders is dynamic on Windows.
* Also, this method of handling paths is consistent with how they are
* handled on Windows in other parts of PA. Note that this is only needed
* in system-wide mode since paths in user instances are already handled
* properly.
*/
char *run_path = pa_sprintf_malloc("%s" PA_PATH_SEP "run", pa_win32_get_system_appdata());
char *lib_path = pa_sprintf_malloc("%s" PA_PATH_SEP "lib", pa_win32_get_system_appdata());
/* https://docs.microsoft.com/en-us/windows/win32/secauthz/ace-strings */
/* https://docs.microsoft.com/en-us/windows/win32/secauthz/modifying-the-acls-of-an-object-in-c-- */
/* https://docs.microsoft.com/en-us/windows/win32/api/sddl/nf-sddl-convertstringsecuritydescriptortosecuritydescriptora */
{
mkdir(run_path);
PSECURITY_DESCRIPTOR sd;
if (ConvertStringSecurityDescriptorToSecurityDescriptorA(
"D:PAI" /* DACL, disable inheritance from parent, enable propagation to children */
"(A;OICI;FA;;;SY)" /* give system full access */
"(A;OICI;FA;;;CO)" /* give owner full access */
"(A;OICI;FA;;;BA)" /* give administrators full access */
"(A;OICI;0x1200a9;;;WD)", /* give everyone read/write/execute access */
SDDL_REVISION_1, &sd, NULL
)) {
PACL acl;
BOOL acl_present, acl_default;
if (GetSecurityDescriptorDacl(sd, &acl_present, &acl, &acl_default)) {
if (SetNamedSecurityInfo(run_path, SE_FILE_OBJECT, DACL_SECURITY_INFORMATION | PROTECTED_DACL_SECURITY_INFORMATION, NULL, NULL, acl, NULL) != ERROR_SUCCESS) {
pa_log_warn("Failed to set DACL for runtime dir: failed to apply DACL: error %lu.", GetLastError());
}
LocalFree(acl);
} else {
pa_log_warn("Failed to set DACL for runtime dir: failed to get security descriptor DACL: error %lu.", GetLastError());
}
} else {
pa_log_warn("Failed to set DACL for runtime dir: failed to parse security descriptor: error %lu.", GetLastError());
}
}
{
mkdir(lib_path);
PSECURITY_DESCRIPTOR sd;
if (ConvertStringSecurityDescriptorToSecurityDescriptorA(
"D:PAI" /* DACL, disable inheritance from parent, enable propagation to children */
"(A;OICI;FA;;;SY)" /* give system full access */
"(A;OICI;FA;;;CO)" /* give owner full access */
"(A;OICI;FA;;;BA)", /* give administrators full access */
SDDL_REVISION_1, &sd, NULL
)) {
PACL acl;
BOOL acl_present, acl_default;
if (GetSecurityDescriptorDacl(sd, &acl_present, &acl, &acl_default)) {
if (SetNamedSecurityInfo(lib_path, SE_FILE_OBJECT, DACL_SECURITY_INFORMATION | PROTECTED_DACL_SECURITY_INFORMATION, NULL, NULL, acl, NULL) != ERROR_SUCCESS) {
pa_log_warn("Failed to set DACL for lib dir: failed to apply DACL: error %lu.", GetLastError());
}
LocalFree(acl);
} else {
pa_log_warn("Failed to set DACL for lib dir: failed to get security descriptor DACL: error %lu.", GetLastError());
}
} else {
pa_log_warn("Failed to set DACL for lib dir: failed to parse security descriptor: error %lu.", GetLastError());
}
}
pa_set_env("HOME", run_path);
if (!getenv("PULSE_RUNTIME_PATH"))
pa_set_env("PULSE_RUNTIME_PATH", run_path);
if (!getenv("PULSE_CONFIG_PATH"))
pa_set_env("PULSE_CONFIG_PATH", lib_path);
if (!getenv("PULSE_STATE_PATH"))
pa_set_env("PULSE_STATE_PATH", lib_path);
pa_xfree(run_path);
pa_xfree(lib_path);
pa_log_info("Not changing user for system instance on Windows.");
return 0;
}
#elif defined(HAVE_PWD_H) && defined(HAVE_GRP_H)
static int change_user(void) {
struct passwd *pw;
struct group * gr;
int r;
/* This function is called only in system-wide mode. It creates a
* runtime dir in /var/run/ with proper UID/GID and drops privs
* afterwards. */
if (!(pw = getpwnam(PA_SYSTEM_USER))) {
pa_log(_("Failed to find user '%s'."), PA_SYSTEM_USER);
return -1;
}
if (!(gr = getgrnam(PA_SYSTEM_GROUP))) {
pa_log(_("Failed to find group '%s'."), PA_SYSTEM_GROUP);
return -1;
}
pa_log_info("Found user '%s' (UID %lu) and group '%s' (GID %lu).",
PA_SYSTEM_USER, (unsigned long) pw->pw_uid,
PA_SYSTEM_GROUP, (unsigned long) gr->gr_gid);
if (pw->pw_gid != gr->gr_gid) {
pa_log(_("GID of user '%s' and of group '%s' don't match."), PA_SYSTEM_USER, PA_SYSTEM_GROUP);
return -1;
}
if (!pa_streq(pw->pw_dir, PA_SYSTEM_RUNTIME_PATH))
pa_log_warn(_("Home directory of user '%s' is not '%s', ignoring."), PA_SYSTEM_USER, PA_SYSTEM_RUNTIME_PATH);
if (pa_make_secure_dir(PA_SYSTEM_RUNTIME_PATH, 0755, pw->pw_uid, gr->gr_gid, true) < 0) {
pa_log(_("Failed to create '%s': %s"), PA_SYSTEM_RUNTIME_PATH, pa_cstrerror(errno));
return -1;
}
if (pa_make_secure_dir(PA_SYSTEM_STATE_PATH, 0700, pw->pw_uid, gr->gr_gid, true) < 0) {
pa_log(_("Failed to create '%s': %s"), PA_SYSTEM_STATE_PATH, pa_cstrerror(errno));
return -1;
}
/* We don't create the config dir here, because we don't need to write to it */
if (initgroups(PA_SYSTEM_USER, gr->gr_gid) != 0) {
pa_log(_("Failed to change group list: %s"), pa_cstrerror(errno));
return -1;
}
#if defined(HAVE_SETRESGID)
r = setresgid(gr->gr_gid, gr->gr_gid, gr->gr_gid);
#elif defined(HAVE_SETEGID)
if ((r = setgid(gr->gr_gid)) >= 0)
r = setegid(gr->gr_gid);
#elif defined(HAVE_SETREGID)
r = setregid(gr->gr_gid, gr->gr_gid);
#else
#error "No API to drop privileges"
#endif
if (r < 0) {
pa_log(_("Failed to change GID: %s"), pa_cstrerror(errno));
return -1;
}
#if defined(HAVE_SETRESUID)
r = setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid);
#elif defined(HAVE_SETEUID)
if ((r = setuid(pw->pw_uid)) >= 0)
r = seteuid(pw->pw_uid);
#elif defined(HAVE_SETREUID)
r = setreuid(pw->pw_uid, pw->pw_uid);
#else
#error "No API to drop privileges"
#endif
if (r < 0) {
pa_log(_("Failed to change UID: %s"), pa_cstrerror(errno));
return -1;
}
pa_drop_caps();
pa_set_env("USER", PA_SYSTEM_USER);
pa_set_env("USERNAME", PA_SYSTEM_USER);
pa_set_env("LOGNAME", PA_SYSTEM_USER);
pa_set_env("HOME", PA_SYSTEM_RUNTIME_PATH);
/* Relevant for pa_runtime_path() */
if (!getenv("PULSE_RUNTIME_PATH"))
pa_set_env("PULSE_RUNTIME_PATH", PA_SYSTEM_RUNTIME_PATH);
if (!getenv("PULSE_CONFIG_PATH"))
pa_set_env("PULSE_CONFIG_PATH", PA_SYSTEM_CONFIG_PATH);
if (!getenv("PULSE_STATE_PATH"))
pa_set_env("PULSE_STATE_PATH", PA_SYSTEM_STATE_PATH);
pa_log_info("Successfully changed user to \"" PA_SYSTEM_USER "\".");
return 0;
}
#else /* HAVE_PWD_H && HAVE_GRP_H */
static int change_user(void) {
pa_log(_("System wide mode unsupported on this platform."));
return -1;
}
#endif /* HAVE_PWD_H && HAVE_GRP_H */
#ifdef HAVE_SYS_RESOURCE_H
static int set_one_rlimit(const pa_rlimit *r, int resource, const char *name) {
struct rlimit rl;
pa_assert(r);
if (!r->is_set)
return 0;
rl.rlim_cur = rl.rlim_max = r->value;
if (setrlimit(resource, &rl) < 0) {
pa_log_info("setrlimit(%s, (%u, %u)) failed: %s", name, (unsigned) r->value, (unsigned) r->value, pa_cstrerror(errno));
return -1;
}
return 0;
}
static void set_all_rlimits(const pa_daemon_conf *conf) {
set_one_rlimit(&conf->rlimit_fsize, RLIMIT_FSIZE, "RLIMIT_FSIZE");
set_one_rlimit(&conf->rlimit_data, RLIMIT_DATA, "RLIMIT_DATA");
set_one_rlimit(&conf->rlimit_stack, RLIMIT_STACK, "RLIMIT_STACK");
set_one_rlimit(&conf->rlimit_core, RLIMIT_CORE, "RLIMIT_CORE");
#ifdef RLIMIT_RSS
set_one_rlimit(&conf->rlimit_rss, RLIMIT_RSS, "RLIMIT_RSS");
#endif
#ifdef RLIMIT_NPROC
set_one_rlimit(&conf->rlimit_nproc, RLIMIT_NPROC, "RLIMIT_NPROC");
#endif
#ifdef RLIMIT_NOFILE
set_one_rlimit(&conf->rlimit_nofile, RLIMIT_NOFILE, "RLIMIT_NOFILE");
#endif
#ifdef RLIMIT_MEMLOCK
set_one_rlimit(&conf->rlimit_memlock, RLIMIT_MEMLOCK, "RLIMIT_MEMLOCK");
#endif
#ifdef RLIMIT_AS
set_one_rlimit(&conf->rlimit_as, RLIMIT_AS, "RLIMIT_AS");
#endif
#ifdef RLIMIT_LOCKS
set_one_rlimit(&conf->rlimit_locks, RLIMIT_LOCKS, "RLIMIT_LOCKS");
#endif
#ifdef RLIMIT_SIGPENDING
set_one_rlimit(&conf->rlimit_sigpending, RLIMIT_SIGPENDING, "RLIMIT_SIGPENDING");
#endif
#ifdef RLIMIT_MSGQUEUE
set_one_rlimit(&conf->rlimit_msgqueue, RLIMIT_MSGQUEUE, "RLIMIT_MSGQUEUE");
#endif
#ifdef RLIMIT_NICE
set_one_rlimit(&conf->rlimit_nice, RLIMIT_NICE, "RLIMIT_NICE");
#endif
#ifdef RLIMIT_RTPRIO
set_one_rlimit(&conf->rlimit_rtprio, RLIMIT_RTPRIO, "RLIMIT_RTPRIO");
#endif
#ifdef RLIMIT_RTTIME
set_one_rlimit(&conf->rlimit_rttime, RLIMIT_RTTIME, "RLIMIT_RTTIME");
#endif
}
#endif
static char *check_configured_address(void) {
char *default_server = NULL;
pa_client_conf *c = pa_client_conf_new();
pa_client_conf_load(c, true, true);
if (c->default_server && *c->default_server)
default_server = pa_xstrdup(c->default_server);
pa_client_conf_free(c);
return default_server;
}
#ifdef HAVE_DBUS
static pa_dbus_connection *register_dbus_name(pa_core *c, DBusBusType bus, const char* name) {
DBusError error;
pa_dbus_connection *conn;
dbus_error_init(&error);
if (!(conn = pa_dbus_bus_get(c, bus, &error)) || dbus_error_is_set(&error)) {
pa_log_warn("Unable to contact D-Bus: %s: %s", error.name, error.message);
goto fail;
}
if (dbus_bus_request_name(pa_dbus_connection_get(conn), name, DBUS_NAME_FLAG_DO_NOT_QUEUE, &error) == DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER) {
pa_log_debug("Got %s!", name);
return conn;
}
if (dbus_error_is_set(&error))
pa_log_error("Failed to acquire %s: %s: %s", name, error.name, error.message);
else
pa_log_error("D-Bus name %s already taken.", name);
/* PA cannot be started twice by the same user and hence we can
* ignore mostly the case that a name is already taken. */
fail:
if (conn)
pa_dbus_connection_unref(conn);
dbus_error_free(&error);
return NULL;
}
#endif
#ifdef OS_IS_WIN32
#define SVC_NAME "PulseAudio"
static bool is_svc = true;
static int argc;
static char **argv;
static int real_main(int s_argc, char *s_argv[]);
static SERVICE_STATUS_HANDLE svc_status;
DWORD svc_callback(DWORD ctl, DWORD evt, LPVOID data, LPVOID userdata) {
pa_mainloop **m = userdata;
switch (ctl) {
case SERVICE_CONTROL_STOP:
case SERVICE_CONTROL_SHUTDOWN:
if (m) {
pa_log_info("Exiting.");
pa_mainloop_get_api(*m)->quit(pa_mainloop_get_api(*m), 0);
}
return NO_ERROR;
case SERVICE_CONTROL_INTERROGATE:
return NO_ERROR;
}
return ERROR_CALL_NOT_IMPLEMENTED;
}
int main(int p_argc, char *p_argv[]) {
argc = p_argc;
argv = p_argv;
if (StartServiceCtrlDispatcherA((SERVICE_TABLE_ENTRYA[]){
{SVC_NAME, (LPSERVICE_MAIN_FUNCTIONA) real_main},
{0},
})) return 0;
is_svc = false;
return real_main(0, NULL);
}
static int real_main(int s_argc, char *s_argv[]) {
#else
int main(int argc, char *argv[]) {
#endif
pa_core *c = NULL;
pa_strbuf *buf = NULL;
pa_daemon_conf *conf = NULL;
pa_mainloop *mainloop = NULL;
char *s;
char *configured_address;
int r = 0, retval = 1, d = 0;
bool valid_pid_file = false;
bool ltdl_init = false;
int n_fds = 0, *passed_fds = NULL;
const char *e;
#ifdef HAVE_FORK
int daemon_pipe[2] = { -1, -1 };
int daemon_pipe2[2] = { -1, -1 };
#ifdef HAVE_COREAUDIO
char **args;
#endif
#endif
int autospawn_fd = -1;
bool autospawn_locked = false;
#ifdef HAVE_DBUS
pa_dbusobj_server_lookup *server_lookup = NULL; /* /org/pulseaudio/server_lookup */
pa_dbus_connection *lookup_service_bus = NULL; /* Always the user bus. */
pa_dbus_connection *server_bus = NULL; /* The bus where we reserve org.pulseaudio.Server, either the user or the system bus. */
bool start_server;
#endif
#ifdef OS_IS_WIN32
if (is_svc && !(svc_status = RegisterServiceCtrlHandlerExA(SVC_NAME, (LPHANDLER_FUNCTION_EX) svc_callback, &mainloop))) {
pa_log("Failed to register service control handler.");
goto finish;
}
if (is_svc) {
SetServiceStatus(svc_status, &(SERVICE_STATUS){
.dwServiceType = SERVICE_WIN32,
.dwCurrentState = SERVICE_START_PENDING,
.dwControlsAccepted = 0,
.dwWin32ExitCode = NO_ERROR,
.dwWaitHint = 3000,
});
}
#endif
pa_log_set_ident("pulseaudio");
pa_log_set_level(PA_LOG_NOTICE);
pa_log_set_flags(PA_LOG_COLORS|PA_LOG_PRINT_FILE|PA_LOG_PRINT_LEVEL, PA_LOG_RESET);
#if !defined(HAVE_BIND_NOW) && defined(__linux__) && defined(__OPTIMIZE__)
/*
Disable lazy relocations to make usage of external libraries
more deterministic for our RT threads. We abuse __OPTIMIZE__ as
a check whether we are a debug build or not. This all is
admittedly a bit snake-oilish.
*/
if (!getenv("LD_BIND_NOW")) {
char *rp;
char *canonical_rp;
/* We have to execute ourselves, because the libc caches the
* value of $LD_BIND_NOW on initialization. */
pa_set_env("LD_BIND_NOW", "1");
if ((canonical_rp = pa_realpath(PA_BINARY))) {
if ((rp = pa_readlink("/proc/self/exe"))) {
if (pa_streq(rp, canonical_rp))
pa_assert_se(execv(rp, argv) == 0);
else
pa_log_warn("/proc/self/exe does not point to %s, cannot self execute. Are you playing games?", canonical_rp);
pa_xfree(rp);
} else
pa_log_warn("Couldn't read /proc/self/exe, cannot self execute. Running in a chroot()?");
pa_xfree(canonical_rp);
} else
pa_log_warn("Couldn't canonicalize binary path, cannot self execute.");
}
#endif
#ifdef HAVE_SYSTEMD_DAEMON
n_fds = sd_listen_fds(0);
if (n_fds > 0) {
int i = n_fds;
passed_fds = pa_xnew(int, n_fds+2);
passed_fds[n_fds] = passed_fds[n_fds+1] = -1;
while (i--)
passed_fds[i] = SD_LISTEN_FDS_START + i;
}
#endif
if (!passed_fds) {
n_fds = 0;
passed_fds = pa_xnew(int, 2);
passed_fds[0] = passed_fds[1] = -1;
}
if ((e = getenv("PULSE_PASSED_FD"))) {
int passed_fd = atoi(e);
if (passed_fd > 2)
passed_fds[n_fds] = passed_fd;
}
/* We might be autospawned, in which case have no idea in which
* context we have been started. Let's cleanup our execution
* context as good as possible */
pa_reset_personality();
pa_drop_root();
pa_close_allv(passed_fds);
pa_xfree(passed_fds);
pa_reset_sigs(-1);
pa_unblock_sigs(-1);
pa_reset_priority();
/* Load locale from the environment. */
setlocale(LC_ALL, "");
/* Set LC_NUMERIC to C so that floating point strings are consistently
* formatted and parsed across locales. */
setlocale(LC_NUMERIC, "C");
pa_init_i18n();
conf = pa_daemon_conf_new();
if (pa_daemon_conf_load(conf, NULL) < 0)
goto finish;
if (pa_daemon_conf_env(conf) < 0)
goto finish;
if (pa_cmdline_parse(conf, argc, argv, &d) < 0) {
pa_log(_("Failed to parse command line."));
goto finish;
}
if (conf->log_target)
pa_log_set_target(conf->log_target);
else {
pa_log_target target = { .type = PA_LOG_STDERR, .file = NULL };
pa_log_set_target(&target);
}
pa_log_set_level(conf->log_level);
if (conf->log_meta)
pa_log_set_flags(PA_LOG_PRINT_META, PA_LOG_SET);
if (conf->log_time)
pa_log_set_flags(PA_LOG_PRINT_TIME, PA_LOG_SET);
pa_log_set_show_backtrace(conf->log_backtrace);
#ifdef HAVE_DBUS
/* conf->system_instance and conf->local_server_type control almost the
* same thing; make them agree about what is requested. */
switch (conf->local_server_type) {
case PA_SERVER_TYPE_UNSET:
conf->local_server_type = conf->system_instance ? PA_SERVER_TYPE_SYSTEM : PA_SERVER_TYPE_USER;
break;
case PA_SERVER_TYPE_USER:
case PA_SERVER_TYPE_NONE:
conf->system_instance = false;
break;
case PA_SERVER_TYPE_SYSTEM:
conf->system_instance = true;
break;
default:
pa_assert_not_reached();
}
start_server = conf->local_server_type == PA_SERVER_TYPE_USER || (getuid() == 0 && conf->local_server_type == PA_SERVER_TYPE_SYSTEM);
if (!start_server && conf->local_server_type == PA_SERVER_TYPE_SYSTEM) {
pa_log_notice(_("System mode refused for non-root user. Only starting the D-Bus server lookup service."));
conf->system_instance = false;
}
#endif
LTDL_SET_PRELOADED_SYMBOLS();
pa_ltdl_init();
ltdl_init = true;
if (conf->dl_search_path)
lt_dlsetsearchpath(conf->dl_search_path);
#ifdef OS_IS_WIN32
{
WSADATA data;
WSAStartup(MAKEWORD(2, 0), &data);
}
#endif
pa_random_seed();
switch (conf->cmd) {
case PA_CMD_DUMP_MODULES:
pa_dump_modules(conf, argc-d, argv+d);
retval = 0;
goto finish;
case PA_CMD_DUMP_CONF: {
if (d < argc) {
pa_log("Too many arguments.");
goto finish;
}
s = pa_daemon_conf_dump(conf);
fputs(s, stdout);
pa_xfree(s);
retval = 0;
goto finish;
}
case PA_CMD_DUMP_RESAMPLE_METHODS: {
int i;
if (d < argc) {
pa_log("Too many arguments.");
goto finish;
}
for (i = 0; i < PA_RESAMPLER_MAX; i++)
if (pa_resample_method_supported(i))
printf("%s\n", pa_resample_method_to_string(i));
retval = 0;
goto finish;
}
case PA_CMD_HELP :
pa_cmdline_help(argv[0]);
retval = 0;
goto finish;
case PA_CMD_VERSION :
if (d < argc) {
pa_log("Too many arguments.");
goto finish;
}
printf(PACKAGE_NAME" "PACKAGE_VERSION"\n");
retval = 0;
goto finish;
case PA_CMD_CHECK: {
pid_t pid;
if (d < argc) {
pa_log("Too many arguments.");
goto finish;
}
if (pa_pid_file_check_running(&pid, "pulseaudio") < 0)
pa_log_info("Daemon not running");
else {
pa_log_info("Daemon running as PID %u", pid);
retval = 0;
}
goto finish;
}
case PA_CMD_KILL:
if (d < argc) {
pa_log("Too many arguments.");
goto finish;
}
if (pa_pid_file_kill(SIGINT, NULL, "pulseaudio") < 0)
pa_log(_("Failed to kill daemon: %s"), pa_cstrerror(errno));
else
retval = 0;
goto finish;
case PA_CMD_CLEANUP_SHM:
if (d < argc) {
pa_log("Too many arguments.");
goto finish;
}
if (pa_shm_cleanup() >= 0)
retval = 0;
goto finish;
default:
pa_assert(conf->cmd == PA_CMD_DAEMON || conf->cmd == PA_CMD_START);
}
if (d < argc) {
pa_log("Too many arguments.");
goto finish;
}
#ifdef HAVE_GETUID
if (getuid() == 0 && !conf->system_instance)
pa_log_warn(_("This program is not intended to be run as root (unless --system is specified)."));
#ifndef HAVE_DBUS /* A similar, only a notice worthy check was done earlier, if D-Bus is enabled. */
else if (getuid() != 0 && conf->system_instance) {
pa_log(_("Root privileges required."));
goto finish;
}
#endif
#endif /* HAVE_GETUID */
if (conf->cmd == PA_CMD_START && conf->system_instance) {
pa_log(_("--start not supported for system instances."));
goto finish;
}
#if defined(HAVE_FORK) && defined(HAVE_COREAUDIO)
if ((e = getenv("PULSE_DAEMON_FD"))) {
int32_t fd;
if (pa_atoi(e, &fd) < 0)
goto finish;
daemon_pipe2[1] = fd;
if (conf->cmd == PA_CMD_START) autospawn_locked = true;
}
#endif
if (conf->cmd == PA_CMD_START && (configured_address = check_configured_address())) {
/* There is an server address in our config, but where did it come from?
* By default a standard X11 login will load module-x11-publish which will
* inject PULSE_SERVER X11 property. If the PA daemon crashes, we will end
* up hitting this code path. So we have to check to see if our configured_address
* is the same as the value that would go into this property so that we can
* recover (i.e. autospawn) from a crash.
*/
char *ufn;
bool start_anyway = false;
if ((ufn = pa_runtime_path(PA_NATIVE_DEFAULT_UNIX_SOCKET))) {
char *id;
if ((id = pa_machine_id())) {
pa_strlist *server_list;
char formatted_ufn[256];
pa_snprintf(formatted_ufn, sizeof(formatted_ufn), "{%s}unix:%s", id, ufn);
pa_xfree(id);
if ((server_list = pa_strlist_parse(configured_address))) {
char *u = NULL;
/* We only need to check the first server */
server_list = pa_strlist_pop(server_list, &u);
pa_strlist_free(server_list);
start_anyway = (u && pa_streq(formatted_ufn, u));
pa_xfree(u);
}
}
pa_xfree(ufn);
}
if (!start_anyway) {
pa_log_notice(_("User-configured server at %s, refusing to start/autospawn."), configured_address);
pa_xfree(configured_address);
retval = 0;
goto finish;
}
pa_log_notice(_("User-configured server at %s, which appears to be local. Probing deeper."), configured_address);
pa_xfree(configured_address);
}
if (conf->system_instance && !conf->disallow_exit)
pa_log_warn(_("Running in system mode, but --disallow-exit not set."));
if (conf->system_instance && !conf->disallow_module_loading)
pa_log_warn(_("Running in system mode, but --disallow-module-loading not set."));
if (conf->system_instance && !conf->disable_shm) {
pa_log_notice(_("Running in system mode, forcibly disabling SHM mode."));
conf->disable_shm = true;
}
if (conf->system_instance && conf->exit_idle_time >= 0) {
pa_log_notice(_("Running in system mode, forcibly disabling exit idle time."));
conf->exit_idle_time = -1;
}
if (conf->cmd == PA_CMD_START) {
/* If we shall start PA only when it is not running yet, we
* first take the autospawn lock to make things
* synchronous. */
/* This locking and thread synchronisation code doesn't work reliably
* on kFreeBSD (Debian bug #705435), or in upstream FreeBSD ports
* (bug reference: ports/128947, patched in SVN r231972). */
#if !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__)
if ((autospawn_fd = pa_autospawn_lock_init()) < 0) {
pa_log("Failed to initialize autospawn lock");
goto finish;
}
if (!autospawn_locked && pa_autospawn_lock_acquire(true) < 0) {
pa_log("Failed to acquire autospawn lock");
goto finish;
}
autospawn_locked = true;
#endif
}
if (conf->daemonize) {
#ifdef HAVE_FORK
pid_t child;
#endif
if (pa_stdio_acquire() < 0) {
pa_log(_("Failed to acquire stdio."));
goto finish;
}
#ifdef HAVE_FORK
if (pipe(daemon_pipe) < 0) {
pa_log(_("pipe() failed: %s"), pa_cstrerror(errno));
goto finish;
}
if ((child = fork()) < 0) {
pa_log(_("fork() failed: %s"), pa_cstrerror(errno));
pa_close_pipe(daemon_pipe);
goto finish;
}
if (child != 0) {
ssize_t n;
/* Father */
pa_assert_se(pa_close(daemon_pipe[1]) == 0);
daemon_pipe[1] = -1;
if ((n = pa_loop_read(daemon_pipe[0], &retval, sizeof(retval), NULL)) != sizeof(retval)) {
if (n < 0)
pa_log(_("read() failed: %s"), pa_cstrerror(errno));
retval = 1;
}
if (retval)
pa_log(_("Daemon startup failed."));
else
pa_log_info("Daemon startup successful.");
goto finish;
}
if (autospawn_fd >= 0) {
/* The lock file is unlocked from the parent, so we need
* to close it in the child */
pa_autospawn_lock_release();
pa_autospawn_lock_done(true);
autospawn_locked = false;
autospawn_fd = -1;
}
pa_assert_se(pa_close(daemon_pipe[0]) == 0);
daemon_pipe[0] = -1;
#endif
if (!conf->log_target) {
#ifdef HAVE_SYSTEMD_JOURNAL
pa_log_target target = { .type = PA_LOG_JOURNAL, .file = NULL };
#else
pa_log_target target = { .type = PA_LOG_SYSLOG, .file = NULL };
#endif
pa_log_set_target(&target);
}
#ifdef HAVE_SETSID
if (setsid() < 0) {
pa_log(_("setsid() failed: %s"), pa_cstrerror(errno));
goto finish;
}
#endif
#ifdef HAVE_FORK
/* We now are a session and process group leader. Let's fork
* again and let the father die, so that we'll become a
* process that can never acquire a TTY again, in a session and
* process group without leader */
if (pipe(daemon_pipe2) < 0) {
pa_log(_("pipe() failed: %s"), pa_cstrerror(errno));
goto finish;
}
if ((child = fork()) < 0) {
pa_log(_("fork() failed: %s"), pa_cstrerror(errno));
pa_close_pipe(daemon_pipe2);
goto finish;
}
if (child != 0) {
ssize_t n;
/* Father */
pa_assert_se(pa_close(daemon_pipe2[1]) == 0);
daemon_pipe2[1] = -1;
if ((n = pa_loop_read(daemon_pipe2[0], &retval, sizeof(retval), NULL)) != sizeof(retval)) {
if (n < 0)
pa_log(_("read() failed: %s"), pa_cstrerror(errno));
retval = 1;
}
/* We now have to take care of signalling the first fork with
* the return value we've received from this fork... */
pa_assert(daemon_pipe[1] >= 0);
pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
pa_close(daemon_pipe[1]);
daemon_pipe[1] = -1;
goto finish;
}
pa_assert_se(pa_close(daemon_pipe2[0]) == 0);
daemon_pipe2[0] = -1;
/* We no longer need the (first) daemon_pipe as it's handled in our child above */
pa_close_pipe(daemon_pipe);
#endif
#ifdef SIGTTOU
signal(SIGTTOU, SIG_IGN);
#endif
#ifdef SIGTTIN
signal(SIGTTIN, SIG_IGN);
#endif
#ifdef SIGTSTP
signal(SIGTSTP, SIG_IGN);
#endif
pa_nullify_stdfds();
#if defined(HAVE_FORK) && defined(HAVE_COREAUDIO)
/* CoreAudio crashes if we don't exec after forking */
if (!(args = malloc((argc + 2) * sizeof *args)))
goto finish;
memcpy(args, argv, argc * sizeof *argv);
args[argc] = "--daemonize=no";
args[argc+1] = NULL;
s = pa_sprintf_malloc("%d", daemon_pipe2[1]);
pa_set_env("PULSE_DAEMON_FD", s);
execv(PA_BINARY, args);
#endif
}
pa_set_env_and_record("PULSE_INTERNAL", "1");
pa_assert_se(chdir("/") == 0);
umask(0077);
#ifdef HAVE_SYS_RESOURCE_H
set_all_rlimits(conf);
#endif
pa_rtclock_hrtimer_enable();
if (conf->high_priority)
pa_raise_priority(conf->nice_level);
if (conf->system_instance)
if (change_user() < 0)
goto finish;
pa_set_env_and_record("PULSE_SYSTEM", conf->system_instance ? "1" : "0");
pa_log_info("This is PulseAudio %s", PACKAGE_VERSION);
pa_log_debug("Compilation CFLAGS: %s", PA_CFLAGS);
#ifdef HAVE_LIBSAMPLERATE
pa_log_warn("Compiled with DEPRECATED libsamplerate support!");
#endif
s = pa_uname_string();
pa_log_debug("Running on host: %s", s);
pa_xfree(s);
pa_log_debug("Found %u CPUs.", pa_ncpus());
pa_log_info("Page size is %zu bytes", pa_page_size());
#ifdef HAVE_VALGRIND_MEMCHECK_H
pa_log_debug("Compiled with Valgrind support: yes");
#else
pa_log_debug("Compiled with Valgrind support: no");
#endif
pa_log_debug("Running in valgrind mode: %s", pa_yes_no(pa_in_valgrind()));
pa_log_debug("Running in VM: %s", pa_yes_no(pa_running_in_vm()));
#ifdef HAVE_RUNNING_FROM_BUILD_TREE
pa_log_debug("Running from build tree: %s", pa_yes_no(pa_run_from_build_tree()));
#else
pa_log_debug("Running from build tree: no");
#endif
#ifdef __OPTIMIZE__
pa_log_debug("Optimized build: yes");
#else
pa_log_debug("Optimized build: no");
#endif
#ifdef NDEBUG
pa_log_debug("NDEBUG defined, all asserts disabled.");
#elif defined(FASTPATH)
pa_log_debug("FASTPATH defined, only fast path asserts disabled.");
#else
pa_log_debug("All asserts enabled.");
#endif
if (!(s = pa_machine_id())) {
pa_log(_("Failed to get machine ID"));
goto finish;
}
pa_log_info("Machine ID is %s.", s);
pa_xfree(s);
if ((s = pa_session_id())) {
pa_log_info("Session ID is %s.", s);
pa_xfree(s);
}
if (!(s = pa_get_runtime_dir()))
goto finish;
pa_log_info("Using runtime directory %s.", s);
pa_xfree(s);
if (!(s = pa_get_state_dir()))
goto finish;
pa_log_info("Using state directory %s.", s);
pa_xfree(s);
pa_log_info("Using modules directory %s.", conf->dl_search_path);
pa_log_info("Running in system mode: %s", pa_yes_no(pa_in_system_mode()));
if (pa_in_system_mode())
pa_log_warn(_("OK, so you are running PA in system mode. Please make sure that you actually do want to do that.\n"
"Please read http://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/WhatIsWrongWithSystemWide/ for an explanation why system mode is usually a bad idea."));
if (conf->use_pid_file) {
int z;
if ((z = pa_pid_file_create("pulseaudio")) != 0) {
if (conf->cmd == PA_CMD_START && z > 0) {
/* If we are already running and with are run in
* --start mode, then let's return this as success. */
retval = 0;
goto finish;
}
pa_log(_("pa_pid_file_create() failed."));
goto finish;
}
valid_pid_file = true;
}
pa_disable_sigpipe();
if (pa_rtclock_hrtimer())
pa_log_info("System supports high resolution timers");
else
pa_log_info("System appears to not support high resolution timers");
if (conf->lock_memory) {
#if defined(HAVE_SYS_MMAN_H) && !defined(__ANDROID__)
if (mlockall(MCL_FUTURE) < 0)
pa_log_warn("mlockall() failed: %s", pa_cstrerror(errno));
else
pa_log_info("Successfully locked process into memory.");
#else
pa_log_warn("Memory locking requested but not supported on platform.");
#endif
}
pa_memtrap_install();
pa_assert_se(mainloop = pa_mainloop_new());
if (!(c = pa_core_new(pa_mainloop_get_api(mainloop), !conf->disable_shm,
!conf->disable_shm && !conf->disable_memfd && pa_memfd_is_locally_supported(),
conf->shm_size))) {
pa_log(_("pa_core_new() failed."));
goto finish;
}
c->default_sample_spec = conf->default_sample_spec;
c->alternate_sample_rate = conf->alternate_sample_rate;
c->default_channel_map = conf->default_channel_map;
c->default_n_fragments = conf->default_n_fragments;
c->default_fragment_size_msec = conf->default_fragment_size_msec;
c->deferred_volume_safety_margin_usec = conf->deferred_volume_safety_margin_usec;
c->deferred_volume_extra_delay_usec = conf->deferred_volume_extra_delay_usec;
c->lfe_crossover_freq = conf->lfe_crossover_freq;
c->exit_idle_time = conf->exit_idle_time;
c->scache_idle_time = conf->scache_idle_time;
c->resample_method = conf->resample_method;
c->realtime_priority = conf->realtime_priority;
c->realtime_scheduling = conf->realtime_scheduling;
c->avoid_resampling = conf->avoid_resampling;
c->disable_remixing = conf->disable_remixing;
c->remixing_use_all_sink_channels = conf->remixing_use_all_sink_channels;
c->remixing_produce_lfe = conf->remixing_produce_lfe;
c->remixing_consume_lfe = conf->remixing_consume_lfe;
c->deferred_volume = conf->deferred_volume;
c->running_as_daemon = conf->daemonize;
c->disallow_exit = conf->disallow_exit;
c->flat_volumes = conf->flat_volumes;
c->rescue_streams = conf->rescue_streams;
#ifdef HAVE_DBUS
c->server_type = conf->local_server_type;
#endif
pa_core_check_idle(c);
c->state = PA_CORE_RUNNING;
pa_cpu_init(&c->cpu_info);
pa_assert_se(pa_signal_init(pa_mainloop_get_api(mainloop)) == 0);
pa_signal_new(SIGINT, signal_callback, c);
pa_signal_new(SIGTERM, signal_callback, c);
#ifdef SIGUSR1
pa_signal_new(SIGUSR1, signal_callback, c);
#endif
#ifdef SIGUSR2
pa_signal_new(SIGUSR2, signal_callback, c);
#endif
#ifdef SIGHUP
pa_signal_new(SIGHUP, signal_callback, c);
#endif
if (!conf->no_cpu_limit)
pa_assert_se(pa_cpu_limit_init(pa_mainloop_get_api(mainloop)) == 0);
buf = pa_strbuf_new();
#ifdef HAVE_DBUS
pa_assert_se(dbus_threads_init_default());
if (start_server)
#endif
{
const char *command_source = NULL;
if (conf->load_default_script_file) {
FILE *f;
if ((f = pa_daemon_conf_open_default_script_file(conf))) {
r = pa_cli_command_execute_file_stream(c, f, buf, &conf->fail);
fclose(f);
command_source = pa_daemon_conf_get_default_script_file(conf);
}
}
if (r >= 0) {
r = pa_cli_command_execute(c, conf->script_commands, buf, &conf->fail);
command_source = _("command line arguments");
}
pa_log_error("%s", s = pa_strbuf_to_string_free(buf));
pa_xfree(s);
if (r < 0 && conf->fail) {
pa_log(_("Failed to initialize daemon due to errors while executing startup commands. Source of commands: %s"), command_source);
goto finish;
}
if (!c->modules || pa_idxset_size(c->modules) == 0) {
pa_log(_("Daemon startup without any loaded modules, refusing to work."));
goto finish;
}
#ifdef HAVE_DBUS
} else {
/* When we just provide the D-Bus server lookup service, we don't want
* any modules to be loaded. We haven't loaded any so far, so one might
* think there's no way to contact the server, but receiving certain
* signals could still cause modules to load. */
conf->disallow_module_loading = true;
#endif
}
/* We completed the initial module loading, so let's disable it
* from now on, if requested */
c->disallow_module_loading = conf->disallow_module_loading;
#ifdef HAVE_DBUS
if (!conf->system_instance) {
if ((server_lookup = pa_dbusobj_server_lookup_new(c))) {
if (!(lookup_service_bus = register_dbus_name(c, DBUS_BUS_SESSION, "org.PulseAudio1")))
goto finish;
}
}
if (start_server)
server_bus = register_dbus_name(c, conf->system_instance ? DBUS_BUS_SYSTEM : DBUS_BUS_SESSION, "org.pulseaudio.Server");
#endif
#ifdef HAVE_FORK
if (daemon_pipe2[1] >= 0) {
int ok = 0;
pa_loop_write(daemon_pipe2[1], &ok, sizeof(ok), NULL);
pa_close(daemon_pipe2[1]);
daemon_pipe2[1] = -1;
}
#endif
pa_log_info("Daemon startup complete.");
#ifdef HAVE_SYSTEMD_DAEMON
sd_notify(0, "READY=1");
#endif
#ifdef OS_IS_WIN32
if (is_svc) {
SetServiceStatus(svc_status, &(SERVICE_STATUS){
.dwServiceType = SERVICE_WIN32,
.dwCurrentState = SERVICE_RUNNING,
.dwControlsAccepted = SERVICE_ACCEPT_STOP|SERVICE_ACCEPT_SHUTDOWN,
.dwWin32ExitCode = NO_ERROR,
.dwWaitHint = 0,
});
}
#endif
retval = 0;
if (pa_mainloop_run(mainloop, &retval) < 0)
goto finish;
pa_log_info("Daemon shutdown initiated.");
#ifdef HAVE_SYSTEMD_DAEMON
sd_notify(0, "STOPPING=1");
#endif
#ifdef OS_IS_WIN32
if (is_svc) {
SetServiceStatus(svc_status, &(SERVICE_STATUS){
.dwServiceType = SERVICE_WIN32,
.dwCurrentState = SERVICE_STOP_PENDING,
.dwControlsAccepted = 0,
.dwWin32ExitCode = NO_ERROR,
.dwWaitHint = 2000,
});
}
#endif
finish:
#ifdef HAVE_DBUS
if (server_bus)
pa_dbus_connection_unref(server_bus);
if (lookup_service_bus)
pa_dbus_connection_unref(lookup_service_bus);
if (server_lookup)
pa_dbusobj_server_lookup_free(server_lookup);
#endif
if (autospawn_fd >= 0) {
if (autospawn_locked)
pa_autospawn_lock_release();
pa_autospawn_lock_done(false);
}
if (c) {
/* Ensure all the modules/samples are unloaded when the core is still ref'ed,
* as unlink callback hooks in modules may need the core to be ref'ed */
pa_module_unload_all(c);
pa_scache_free_all(c);
pa_core_unref(c);
pa_log_info("Daemon terminated.");
}
if (!conf->no_cpu_limit)
pa_cpu_limit_done();
pa_signal_done();
#ifdef HAVE_FORK
/* If we have daemon_pipe[1] still open, this means we've failed after
* the first fork, but before the second. Therefore just write to it. */
if (daemon_pipe[1] >= 0)
pa_loop_write(daemon_pipe[1], &retval, sizeof(retval), NULL);
else if (daemon_pipe2[1] >= 0)
pa_loop_write(daemon_pipe2[1], &retval, sizeof(retval), NULL);
pa_close_pipe(daemon_pipe2);
pa_close_pipe(daemon_pipe);
#endif
if (mainloop)
pa_mainloop_free(mainloop);
if (conf)
pa_daemon_conf_free(conf);
if (valid_pid_file)
pa_pid_file_remove();
/* This has no real purpose except making things valgrind-clean */
pa_unset_env_recorded();
#ifdef OS_IS_WIN32
WSACleanup();
#endif
if (ltdl_init)
pa_ltdl_done();
#ifdef HAVE_DBUS
dbus_shutdown();
#endif
#ifdef OS_IS_WIN32
if (is_svc) {
SetServiceStatus(svc_status, &(SERVICE_STATUS){
.dwServiceType = SERVICE_WIN32,
.dwCurrentState = SERVICE_STOPPED,
.dwControlsAccepted = 0,
.dwWin32ExitCode = retval ? ERROR_PROCESS_ABORTED : NO_ERROR,
.dwWaitHint = 0,
});
}
#endif
return retval;
}
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