#include <dbus/dbus.h>

#include <stdio.h>

#include <errno.h>

#include <string.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <getopt.h>

#include <signal.h>

#include <sys/wait.h>

#include <fcntl.h>

#include <sys/prctl.h>

#include "manager.h"

#include "log.h"

#include "mount-setup.h"

#include "hostname-setup.h"

#include "loopback-setup.h"

#include "kmod-setup.h"

#include "locale-setup.h"

#include "selinux-setup.h"

#include "load-fragment.h"

#include "fdset.h"

#include "special.h"

#include "conf-parser.h"

#include "bus-errors.h"

#include "missing.h"

#include "label.h"

#include "build.h"

#include "strv.h"

static enum {

ACTION_RUN,

ACTION_HELP,

ACTION_TEST,

ACTION_DUMP_CONFIGURATION_ITEMS,

ACTION_DONE

} arg_action = ACTION_RUN;

static char *arg_default_unit = NULL;

static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;

static bool arg_dump_core = true;

static bool arg_crash_shell = false;

static int arg_crash_chvt = -1;

static bool arg_confirm_spawn = false;

static bool arg_show_status = true;

#ifdef HAVE_SYSV_COMPAT

static bool arg_sysv_console = true;

#endif

static bool arg_mount_auto = true;

static bool arg_swap_auto = true;

static char **arg_default_controllers = NULL;

static ExecOutput arg_default_std_output = EXEC_OUTPUT_INHERIT;

static ExecOutput arg_default_std_error = EXEC_OUTPUT_INHERIT;

static FILE* serialization = NULL;

static void nop_handler(int sig) {

}

_noreturn_ static void crash(int sig) {

if (!arg_dump_core)

log_error("Caught <%s>, not dumping core.", signal_to_string(sig));

else {

struct sigaction sa;

pid_t pid;

/* We want to wait for the core process, hence let's enable SIGCHLD */

zero(sa);

sa.sa_handler = nop_handler;

sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;

assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);

if ((pid = fork()) < 0)

log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));

else if (pid == 0) {

struct rlimit rl;

/* Enable default signal handler for core dump */

zero(sa);

sa.sa_handler = SIG_DFL;

assert_se(sigaction(sig, &sa, NULL) == 0);

/* Don't limit the core dump size */

zero(rl);

rl.rlim_cur = RLIM_INFINITY;

rl.rlim_max = RLIM_INFINITY;

setrlimit(RLIMIT_CORE, &rl);

/* Just to be sure... */

assert_se(chdir("/") == 0);

/* Raise the signal again */

raise(sig);

assert_not_reached("We shouldn't be here...");

_exit(1);

} else {

siginfo_t status;

int r;

/* Order things nicely. */

if ((r = wait_for_terminate(pid, &status)) < 0)

log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));

else if (status.si_code != CLD_DUMPED)

log_error("Caught <%s>, core dump failed.", signal_to_string(sig));

else

log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);

}

}

if (arg_crash_chvt)

chvt(arg_crash_chvt);

if (arg_crash_shell) {

struct sigaction sa;

pid_t pid;

log_info("Executing crash shell in 10s...");

sleep(10);

/* Let the kernel reap children for us */

zero(sa);

sa.sa_handler = SIG_IGN;

sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;

assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);

if ((pid = fork()) < 0)

log_error("Failed to fork off crash shell: %s", strerror(errno));

else if (pid == 0) {

int fd, r;

if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)

log_error("Failed to acquire terminal: %s", strerror(-fd));

else if ((r = make_stdio(fd)) < 0)

log_error("Failed to duplicate terminal fd: %s", strerror(-r));

execl("/bin/sh", "/bin/sh", NULL);

log_error("execl() failed: %s", strerror(errno));

_exit(1);

}

log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);

}

log_info("Freezing execution.");

freeze();

}

static void install_crash_handler(void) {

struct sigaction sa;

zero(sa);

sa.sa_handler = crash;

sa.sa_flags = SA_NODEFER;

sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);

}

static int console_setup(bool do_reset) {

int tty_fd, r;

/* If we are init, we connect stdin/stdout/stderr to /dev/null

release_terminal();

if (!do_reset)

return 0;

if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {

log_error("Failed to open /dev/console: %s", strerror(-tty_fd));

return -tty_fd;

}

if ((r = reset_terminal(tty_fd)) < 0)

log_error("Failed to reset /dev/console: %s", strerror(-r));

close_nointr_nofail(tty_fd);

return r;

}

static int set_default_unit(const char *u) {

char *c;

assert(u);

if (!(c = strdup(u)))

return -ENOMEM;

free(arg_default_unit);

arg_default_unit = c;

return 0;

}

static int parse_proc_cmdline_word(const char *word) {

static const char * const rlmap[] = {

"emergency", SPECIAL_EMERGENCY_TARGET,

"single", SPECIAL_RESCUE_TARGET,

"-s", SPECIAL_RESCUE_TARGET,

"s", SPECIAL_RESCUE_TARGET,

"S", SPECIAL_RESCUE_TARGET,

"1", SPECIAL_RESCUE_TARGET,

"2", SPECIAL_RUNLEVEL2_TARGET,

"3", SPECIAL_RUNLEVEL3_TARGET,

"4", SPECIAL_RUNLEVEL4_TARGET,

"5", SPECIAL_RUNLEVEL5_TARGET,

};

assert(word);

if (startswith(word, "systemd.unit="))

return set_default_unit(word + 13);

else if (startswith(word, "systemd.log_target=")) {

if (log_set_target_from_string(word + 19) < 0)

log_warning("Failed to parse log target %s. Ignoring.", word + 19);

} else if (startswith(word, "systemd.log_level=")) {

if (log_set_max_level_from_string(word + 18) < 0)

log_warning("Failed to parse log level %s. Ignoring.", word + 18);

} else if (startswith(word, "systemd.log_color=")) {

if (log_show_color_from_string(word + 18) < 0)

log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);

} else if (startswith(word, "systemd.log_location=")) {

if (log_show_location_from_string(word + 21) < 0)

log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);

} else if (startswith(word, "systemd.dump_core=")) {

int r;

if ((r = parse_boolean(word + 18)) < 0)

log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);

else

arg_dump_core = r;

} else if (startswith(word, "systemd.crash_shell=")) {

int r;

if ((r = parse_boolean(word + 20)) < 0)

log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);

else

arg_crash_shell = r;

} else if (startswith(word, "systemd.confirm_spawn=")) {

int r;

if ((r = parse_boolean(word + 22)) < 0)

log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);

else

arg_confirm_spawn = r;

} else if (startswith(word, "systemd.crash_chvt=")) {

int k;

if (safe_atoi(word + 19, &k) < 0)

log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);

else

arg_crash_chvt = k;

} else if (startswith(word, "systemd.show_status=")) {

int r;

if ((r = parse_boolean(word + 20)) < 0)

log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);

else

arg_show_status = r;

} else if (startswith(word, "systemd.default_standard_output=")) {

int r;

if ((r = exec_output_from_string(word + 32)) < 0)

log_warning("Failed to parse default standard output switch %s, Ignoring.", word + 32);

else

arg_default_std_output = r;

} else if (startswith(word, "systemd.default_standard_error=")) {

int r;

if ((r = exec_output_from_string(word + 31)) < 0)

log_warning("Failed to parse default standard error switch %s, Ignoring.", word + 31);

else

arg_default_std_error = r;

#ifdef HAVE_SYSV_COMPAT

} else if (startswith(word, "systemd.sysv_console=")) {

int r;

if ((r = parse_boolean(word + 21)) < 0)

log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);

else

arg_sysv_console = r;

#endif

} else if (startswith(word, "systemd.")) {

log_warning("Unknown kernel switch %s. Ignoring.", word);

log_info("Supported kernel switches:\n"

"systemd.unit=UNIT Default unit to start\n"

"systemd.dump_core=0|1 Dump core on crash\n"

"systemd.crash_shell=0|1 Run shell on crash\n"

"systemd.crash_chvt=N Change to VT #N on crash\n"

"systemd.confirm_spawn=0|1 Confirm every process spawn\n"

"systemd.show_status=0|1 Show status updates on the console during bootup\n"

#ifdef HAVE_SYSV_COMPAT

"systemd.sysv_console=0|1 Connect output of SysV scripts to console\n"

#endif

"systemd.log_target=console|kmsg|syslog|syslog-or-kmsg|null\n"

" Log target\n"

"systemd.log_level=LEVEL Log level\n"

"systemd.log_color=0|1 Highlight important log messages\n"

"systemd.log_location=0|1 Include code location in log messages\n"

"systemd.default_standard_output=null|tty|syslog|syslog+console|kmsg|kmsg+console\n"

" Set default log output for services\n"

"systemd.default_standard_error=null|tty|syslog|syslog+console|kmsg|kmsg+console\n"

" Set default log error output for services\n");

} else if (streq(word, "quiet")) {

arg_show_status = false;

#ifdef HAVE_SYSV_COMPAT

arg_sysv_console = false;

#endif

} else {

unsigned i;

/* SysV compatibility */

for (i = 0; i < ELEMENTSOF(rlmap); i += 2)

if (streq(word, rlmap[i]))

return set_default_unit(rlmap[i+1]);

}

return 0;

}

static int config_parse_level(

const char *filename,

unsigned line,

const char *section,

const char *lvalue,

const char *rvalue,

void *data,

void *userdata) {

assert(filename);

assert(lvalue);

assert(rvalue);

log_set_max_level_from_string(rvalue);

return 0;

}

static int config_parse_target(

const char *filename,

unsigned line,

const char *section,

const char *lvalue,

const char *rvalue,

void *data,

void *userdata) {

assert(filename);

assert(lvalue);

assert(rvalue);

log_set_target_from_string(rvalue);

return 0;

}

static int config_parse_color(

const char *filename,

unsigned line,

const char *section,

const char *lvalue,

const char *rvalue,

void *data,

void *userdata) {

assert(filename);

assert(lvalue);

assert(rvalue);

log_show_color_from_string(rvalue);

return 0;

}

static int config_parse_location(

const char *filename,

unsigned line,

const char *section,

const char *lvalue,

const char *rvalue,

void *data,

void *userdata) {

assert(filename);

assert(lvalue);

assert(rvalue);

log_show_location_from_string(rvalue);

return 0;

}

static int config_parse_cpu_affinity(

const char *filename,

unsigned line,

const char *section,

const char *lvalue,

const char *rvalue,

void *data,

void *userdata) {

char *w;

size_t l;

char *state;

cpu_set_t *c = NULL;

unsigned ncpus = 0;

assert(filename);

assert(lvalue);

assert(rvalue);

FOREACH_WORD_QUOTED(w, l, rvalue, state) {

char *t;

int r;

unsigned cpu;

if (!(t = strndup(w, l)))

return -ENOMEM;

r = safe_atou(t, &cpu);

free(t);

if (!c)

if (!(c = cpu_set_malloc(&ncpus)))

return -ENOMEM;

if (r < 0 || cpu >= ncpus) {

log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);

CPU_FREE(c);

return -EBADMSG;

}

CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);

}

if (c) {

if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)

log_warning("Failed to set CPU affinity: %m");

CPU_FREE(c);

}

return 0;

}

static DEFINE_CONFIG_PARSE_ENUM(config_parse_output, exec_output, ExecOutput, "Failed to parse output specifier");

static int parse_config_file(void) {

const ConfigItem items[] = {

{ "LogLevel", config_parse_level, NULL, "Manager" },

{ "LogTarget", config_parse_target, NULL, "Manager" },

{ "LogColor", config_parse_color, NULL, "Manager" },

{ "LogLocation", config_parse_location, NULL, "Manager" },

{ "DumpCore", config_parse_bool, &arg_dump_core, "Manager" },

{ "CrashShell", config_parse_bool, &arg_crash_shell, "Manager" },

{ "ShowStatus", config_parse_bool, &arg_show_status, "Manager" },

#ifdef HAVE_SYSV_COMPAT

{ "SysVConsole", config_parse_bool, &arg_sysv_console, "Manager" },

#endif

{ "CrashChVT", config_parse_int, &arg_crash_chvt, "Manager" },

{ "CPUAffinity", config_parse_cpu_affinity, NULL, "Manager" },

{ "MountAuto", config_parse_bool, &arg_mount_auto, "Manager" },

{ "SwapAuto", config_parse_bool, &arg_swap_auto, "Manager" },

{ "DefaultControllers", config_parse_strv, &arg_default_controllers, "Manager" },

{ "DefaultStandardOutput", config_parse_output, &arg_default_std_output, "Manager" },

{ "DefaultStandardError", config_parse_output, &arg_default_std_error, "Manager" },

{ NULL, NULL, NULL, NULL }

};

static const char * const sections[] = {

"Manager",

NULL

};

FILE *f;

const char *fn;

int r;

fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : USER_CONFIG_FILE;

if (!(f = fopen(fn, "re"))) {

if (errno == ENOENT)

return 0;

log_warning("Failed to open configuration file '%s': %m", fn);

return 0;

}

if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)

log_warning("Failed to parse configuration file: %s", strerror(-r));

fclose(f);

return 0;

}

static int parse_proc_cmdline(void) {

char *line, *w, *state;

int r;

size_t l;

if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {

log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));

return 0;

}

FOREACH_WORD_QUOTED(w, l, line, state) {

char *word;

if (!(word = strndup(w, l))) {

r = -ENOMEM;

goto finish;

}

r = parse_proc_cmdline_word(word);

free(word);

if (r < 0)

goto finish;

}

r = 0;

finish:

free(line);

return r;

}

static int parse_argv(int argc, char *argv[]) {

enum {

ARG_LOG_LEVEL = 0x100,

ARG_LOG_TARGET,

ARG_LOG_COLOR,

ARG_LOG_LOCATION,

ARG_UNIT,

ARG_SYSTEM,

ARG_USER,

ARG_TEST,

ARG_DUMP_CONFIGURATION_ITEMS,

ARG_DUMP_CORE,

ARG_CRASH_SHELL,

ARG_CONFIRM_SPAWN,

ARG_SHOW_STATUS,

ARG_SYSV_CONSOLE,

ARG_DESERIALIZE,

ARG_INTROSPECT,

ARG_DEFAULT_STD_OUTPUT,

ARG_DEFAULT_STD_ERROR

};

static const struct option options[] = {

{ "log-level", required_argument, NULL, ARG_LOG_LEVEL },

{ "log-target", required_argument, NULL, ARG_LOG_TARGET },

{ "log-color", optional_argument, NULL, ARG_LOG_COLOR },

{ "log-location", optional_argument, NULL, ARG_LOG_LOCATION },

{ "unit", required_argument, NULL, ARG_UNIT },

{ "system", no_argument, NULL, ARG_SYSTEM },

{ "user", no_argument, NULL, ARG_USER },

{ "test", no_argument, NULL, ARG_TEST },

{ "help", no_argument, NULL, 'h' },

{ "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },

{ "dump-core", no_argument, NULL, ARG_DUMP_CORE },

{ "crash-shell", no_argument, NULL, ARG_CRASH_SHELL },

{ "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },

{ "show-status", optional_argument, NULL, ARG_SHOW_STATUS },

#ifdef HAVE_SYSV_COMPAT

{ "sysv-console", optional_argument, NULL, ARG_SYSV_CONSOLE },

#endif

{ "deserialize", required_argument, NULL, ARG_DESERIALIZE },

{ "introspect", optional_argument, NULL, ARG_INTROSPECT },

{ "default-standard-output", required_argument, NULL, ARG_DEFAULT_STD_OUTPUT, },

{ "default-standard-error", required_argument, NULL, ARG_DEFAULT_STD_ERROR, },

{ NULL, 0, NULL, 0 }

};

int c, r;

assert(argc >= 1);

assert(argv);

while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)

switch (c) {

case ARG_LOG_LEVEL:

if ((r = log_set_max_level_from_string(optarg)) < 0) {

log_error("Failed to parse log level %s.", optarg);

return r;

}

break;

case ARG_LOG_TARGET:

if ((r = log_set_target_from_string(optarg)) < 0) {

log_error("Failed to parse log target %s.", optarg);

return r;

}

break;

case ARG_LOG_COLOR:

if (optarg) {

if ((r = log_show_color_from_string(optarg)) < 0) {

log_error("Failed to parse log color setting %s.", optarg);

return r;

}

} else

log_show_color(true);

break;

case ARG_LOG_LOCATION:

if (optarg) {

if ((r = log_show_location_from_string(optarg)) < 0) {

log_error("Failed to parse log location setting %s.", optarg);

return r;

}

} else

log_show_location(true);

break;

case ARG_DEFAULT_STD_OUTPUT:

if ((r = exec_output_from_string(optarg)) < 0) {

log_error("Failed to parse default standard output setting %s.", optarg);

return r;

} else

arg_default_std_output = r;

break;

case ARG_DEFAULT_STD_ERROR:

if ((r = exec_output_from_string(optarg)) < 0) {

log_error("Failed to parse default standard error output setting %s.", optarg);

return r;

} else

arg_default_std_error = r;

break;

case ARG_UNIT:

if ((r = set_default_unit(optarg)) < 0) {

log_error("Failed to set default unit %s: %s", optarg, strerror(-r));

return r;

}

break;

case ARG_SYSTEM:

arg_running_as = MANAGER_SYSTEM;

break;

case ARG_USER:

arg_running_as = MANAGER_USER;

break;

case ARG_TEST:

arg_action = ACTION_TEST;

break;

case ARG_DUMP_CONFIGURATION_ITEMS:

arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;

break;

case ARG_DUMP_CORE:

arg_dump_core = true;

break;

case ARG_CRASH_SHELL:

arg_crash_shell = true;

break;

case ARG_CONFIRM_SPAWN:

arg_confirm_spawn = true;

break;

case ARG_SHOW_STATUS:

if (optarg) {

if ((r = parse_boolean(optarg)) < 0) {

log_error("Failed to show status boolean %s.", optarg);

return r;

}

arg_show_status = r;

} else

arg_show_status = true;

break;

#ifdef HAVE_SYSV_COMPAT

case ARG_SYSV_CONSOLE:

if (optarg) {

if ((r = parse_boolean(optarg)) < 0) {

log_error("Failed to SysV console boolean %s.", optarg);

return r;

}

arg_sysv_console = r;

} else

arg_sysv_console = true;

break;

#endif

case ARG_DESERIALIZE: {

int fd;

FILE *f;

if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {

log_error("Failed to parse deserialize option %s.", optarg);

return r;

}

if (!(f = fdopen(fd, "r"))) {

log_error("Failed to open serialization fd: %m");

return r;

}

if (serialization)

fclose(serialization);

serialization = f;

break;

}

case ARG_INTROSPECT: {

const char * const * i = NULL;

for (i = bus_interface_table; *i; i += 2)

if (!optarg || streq(i[0], optarg)) {

fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE

"<node>\n", stdout);

fputs(i[1], stdout);

fputs("</node>\n", stdout);

if (optarg)

break;

}

if (!i[0] && optarg)

log_error("Unknown interface %s.", optarg);

arg_action = ACTION_DONE;

break;

}

case 'h':

arg_action = ACTION_HELP;

break;

case 'D':

log_set_max_level(LOG_DEBUG);

break;

case '?':

return -EINVAL;

default:

log_error("Unknown option code %c", c);

return -EINVAL;

}

/* PID 1 will get the kernel arguments as parameters, which we

if (arg_running_as != MANAGER_SYSTEM && optind < argc) {

log_error("Excess arguments.");

return -EINVAL;

}

return 0;

}

static int help(void) {

printf("%s [OPTIONS...]\n\n"

"Starts up and maintains the system or user services.\n\n"

" -h --help Show this help\n"

" --test Determine startup sequence, dump it and exit\n"

" --dump-configuration-items Dump understood unit configuration items\n"

" --introspect[=INTERFACE] Extract D-Bus interface data\n"

" --unit=UNIT Set default unit\n"

" --system Run a system instance, even if PID != 1\n"

" --user Run a user instance\n"

" --dump-core Dump core on crash\n"

" --crash-shell Run shell on crash\n"

" --confirm-spawn Ask for confirmation when spawning processes\n"

" --show-status[=0|1] Show status updates on the console during bootup\n"

#ifdef HAVE_SYSV_COMPAT

" --sysv-console[=0|1] Connect output of SysV scripts to console\n"

#endif

" --log-target=TARGET Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"

" --log-level=LEVEL Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"

" --log-color[=0|1] Highlight important log messages\n"

" --log-location[=0|1] Include code location in log messages\n"

" --default-standard-output= Set default standard output for services\n"

" --default-standard-error= Set default standard error output for services\n",

program_invocation_short_name);

return 0;

}

static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {

FILE *f = NULL;

FDSet *fds = NULL;

int r;

assert(m);

assert(_f);

assert(_fds);

if ((r = manager_open_serialization(m, &f)) < 0) {

log_error("Failed to create serialization faile: %s", strerror(-r));

goto fail;

}

if (!(fds = fdset_new())) {

r = -ENOMEM;

log_error("Failed to allocate fd set: %s", strerror(-r));

goto fail;

}

if ((r = manager_serialize(m, f, fds)) < 0) {

log_error("Failed to serialize state: %s", strerror(-r));

goto fail;

}

if (fseeko(f, 0, SEEK_SET) < 0) {

log_error("Failed to rewind serialization fd: %m");

goto fail;

}

if ((r = fd_cloexec(fileno(f), false)) < 0) {

log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));

goto fail;

}

if ((r = fdset_cloexec(fds, false)) < 0) {

log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));

goto fail;

}

*_f = f;

*_fds = fds;

return 0;

fail:

fdset_free(fds);

if (f)

fclose(f);

return r;

}

static struct dual_timestamp* parse_initrd_timestamp(struct dual_timestamp *t) {

const char *e;

unsigned long long a, b;

assert(t);

if (!(e = getenv("RD_TIMESTAMP")))

return NULL;

if (sscanf(e, "%llu %llu", &a, &b) != 2)

return NULL;

t->realtime = (usec_t) a;

t->monotonic = (usec_t) b;

return t;

}

static void test_mtab(void) {

char *p;

if (readlink_malloc("/etc/mtab", &p) >= 0) {

bool b;

b = streq(p, "/proc/self/mounts") || streq(p, "/proc/mounts");

free(p);

if (b)

return;

}

log_error("/etc/mtab is not a symlink or not pointing to /proc/self/mounts. "

"This is not supported anymore. "

"Please make sure to replace this file by a symlink to avoid incorrect or misleading mount(8) output.");

}

int main(int argc, char *argv[]) {

Manager *m = NULL;

int r, retval = EXIT_FAILURE;

FDSet *fds = NULL;

bool reexecute = false;

const char *shutdown_verb = NULL;

dual_timestamp initrd_timestamp = { 0ULL, 0ULL };

char systemd[] = "systemd";

if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {

/* This is compatbility support for SysV, where

errno = -ENOENT;

execv(SYSTEMCTL_BINARY_PATH, argv);

log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");

return 1;

}

/* If we get started via the /sbin/init symlink then we are

program_invocation_short_name = systemd;

prctl(PR_SET_NAME, systemd);

log_show_color(isatty(STDERR_FILENO) > 0);

log_show_location(false);

log_set_max_level(LOG_INFO);

if (getpid() == 1) {

arg_running_as = MANAGER_SYSTEM;

log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);

/* This might actually not return, but cause a

if (selinux_setup(argv) < 0)

goto finish;

if (label_init() < 0)

goto finish;

} else {

arg_running_as = MANAGER_USER;

log_set_target(LOG_TARGET_CONSOLE);

}

if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)

goto finish;

/* Mount /proc, /sys and friends, so that /proc/cmdline and

if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))

if (mount_setup() < 0)

goto finish;

/* Reset all signal handlers. */

assert_se(reset_all_signal_handlers() == 0);

/* If we are init, we can block sigkill. Yay. */

ignore_signals(SIGNALS_IGNORE, -1);

if (parse_config_file() < 0)

goto finish;

if (arg_running_as == MANAGER_SYSTEM)

if (parse_proc_cmdline() < 0)

goto finish;

log_parse_environment();

if (parse_argv(argc, argv) < 0)

goto finish;

/* If Plymouth is being run make sure we show the status, so

if (access("/dev/.systemd/plymouth", F_OK) >= 0)

arg_show_status = true;

if (arg_action == ACTION_HELP) {

retval = help();

goto finish;

} else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {

unit_dump_config_items(stdout);

retval = EXIT_SUCCESS;

goto finish;

} else if (arg_action == ACTION_DONE) {

retval = EXIT_SUCCESS;

goto finish;

}

assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);

/* Remember open file descriptors for later deserialization */

if (serialization) {

if ((r = fdset_new_fill(&fds)) < 0) {

log_error("Failed to allocate fd set: %s", strerror(-r));

goto finish;

}

assert_se(fdset_remove(fds, fileno(serialization)) >= 0);

} else

close_all_fds(NULL, 0);

/* Set up PATH unless it is already set */

setenv("PATH",

"/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",

arg_running_as == MANAGER_SYSTEM);

if (arg_running_as == MANAGER_SYSTEM) {

/* Parse the data passed to us by the initrd and unset it */

parse_initrd_timestamp(&initrd_timestamp);

filter_environ("RD_");

/* Unset some environment variables passed in from the

unsetenv("HOME");

unsetenv("TERM");

}

/* Move out of the way, so that we won't block unmounts */

assert_se(chdir("/") == 0);

if (arg_running_as == MANAGER_SYSTEM) {

/* Become a session leader if we aren't one yet. */

setsid();

/* Disable the umask logic */

umask(0);

}

/* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */

dbus_connection_set_change_sigpipe(FALSE);

/* Reset the console, but only if this is really init and we

if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {

console_setup(getpid() == 1 && !serialization);

make_null_stdio();

}

/* Open the logging devices, if possible and necessary */

log_open();

/* Make sure we leave a core dump without panicing the

if (getpid() == 1)

install_crash_handler();

log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,

PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));

if (arg_running_as == MANAGER_SYSTEM && !serialization) {

locale_setup();

if (arg_show_status)

status_welcome();

kmod_setup();

hostname_setup();

loopback_setup();

mkdir_p("/dev/.systemd/ask-password/", 0755);

test_mtab();

}

if ((r = manager_new(arg_running_as, &m)) < 0) {

log_error("Failed to allocate manager object: %s", strerror(-r));

goto finish;

}

m->confirm_spawn = arg_confirm_spawn;

m->show_status = arg_show_status;

#ifdef HAVE_SYSV_COMPAT

m->sysv_console = arg_sysv_console;

#endif

m->mount_auto = arg_mount_auto;

m->swap_auto = arg_swap_auto;

m->default_std_output = arg_default_std_output;

m->default_std_error = arg_default_std_error;

if (dual_timestamp_is_set(&initrd_timestamp))

m->initrd_timestamp = initrd_timestamp;

if (arg_default_controllers)

manager_set_default_controllers(m, arg_default_controllers);

if ((r = manager_startup(m, serialization, fds)) < 0)

log_error("Failed to fully start up daemon: %s", strerror(-r));

if (fds) {

/* This will close all file descriptors that were opened, but

fdset_free(fds);

fds = NULL;

}

if (serialization) {

fclose(serialization);

serialization = NULL;

} else {

DBusError error;

Unit *target = NULL;

dbus_error_init(&error);

log_debug("Activating default unit: %s", arg_default_unit);

if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {

log_error("Failed to load default target: %s", bus_error(&error, r));

dbus_error_free(&error);

} else if (target->meta.load_state == UNIT_ERROR)

log_error("Failed to load default target: %s", strerror(-target->meta.load_error));

else if (target->meta.load_state == UNIT_MASKED)

log_error("Default target masked.");

if (!target || target->meta.load_state != UNIT_LOADED) {

log_info("Trying to load rescue target...");

if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {

log_error("Failed to load rescue target: %s", bus_error(&error, r));

dbus_error_free(&error);

goto finish;

} else if (target->meta.load_state == UNIT_ERROR) {

log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));

goto finish;

} else if (target->meta.load_state == UNIT_MASKED) {

log_error("Rescue target masked.");

goto finish;

}

}

assert(target->meta.load_state == UNIT_LOADED);

if (arg_action == ACTION_TEST) {

printf("-> By units:\n");

manager_dump_units(m, stdout, "\t");

}

if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {

log_error("Failed to start default target: %s", bus_error(&error, r));

dbus_error_free(&error);

goto finish;

}

if (arg_action == ACTION_TEST) {

printf("-> By jobs:\n");

manager_dump_jobs(m, stdout, "\t");

retval = EXIT_SUCCESS;

goto finish;

}

}

for (;;) {

if ((r = manager_loop(m)) < 0) {

log_error("Failed to run mainloop: %s", strerror(-r));

goto finish;

}

switch (m->exit_code) {

case MANAGER_EXIT:

retval = EXIT_SUCCESS;

log_debug("Exit.");

goto finish;

case MANAGER_RELOAD:

log_info("Reloading.");

if ((r = manager_reload(m)) < 0)

log_error("Failed to reload: %s", strerror(-r));

break;

case MANAGER_REEXECUTE:

if (prepare_reexecute(m, &serialization, &fds) < 0)

goto finish;

reexecute = true;

log_notice("Reexecuting.");

goto finish;

case MANAGER_REBOOT:

case MANAGER_POWEROFF:

case MANAGER_HALT:

case MANAGER_KEXEC: {

static const char * const table[_MANAGER_EXIT_CODE_MAX] = {

[MANAGER_REBOOT] = "reboot",

[MANAGER_POWEROFF] = "poweroff",

[MANAGER_HALT] = "halt",

[MANAGER_KEXEC] = "kexec"

};

assert_se(shutdown_verb = table[m->exit_code]);

log_notice("Shutting down.");

goto finish;

}

default:

assert_not_reached("Unknown exit code.");

}

}

finish:

if (m)

manager_free(m);

free(arg_default_unit);

strv_free(arg_default_controllers);

dbus_shutdown();

label_finish();

if (reexecute) {

const char *args[15];

unsigned i = 0;

char sfd[16];

assert(serialization);

assert(fds);

args[i++] = SYSTEMD_BINARY_PATH;

args[i++] = "--log-level";

args[i++] = log_level_to_string(log_get_max_level());

args[i++] = "--log-target";

args[i++] = log_target_to_string(log_get_target());

if (arg_running_as == MANAGER_SYSTEM)

args[i++] = "--system";

else

args[i++] = "--user";

if (arg_dump_core)

args[i++] = "--dump-core";

if (arg_crash_shell)

args[i++] = "--crash-shell";

if (arg_confirm_spawn)

args[i++] = "--confirm-spawn";

if (arg_show_status)

args[i++] = "--show-status=1";

else

args[i++] = "--show-status=0";

#ifdef HAVE_SYSV_COMPAT

if (arg_sysv_console)

args[i++] = "--sysv-console=1";

else

args[i++] = "--sysv-console=0";

#endif

snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));

char_array_0(sfd);

args[i++] = "--deserialize";

args[i++] = sfd;

args[i++] = NULL;

assert(i <= ELEMENTSOF(args));

execv(args[0], (char* const*) args);

log_error("Failed to reexecute: %m");

}

if (serialization)

fclose(serialization);

if (fds)

fdset_free(fds);

if (shutdown_verb) {

const char * command_line[] = {

SYSTEMD_SHUTDOWN_BINARY_PATH,

shutdown_verb,

NULL

};

execv(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line);

log_error("Failed to execute shutdown binary, freezing: %m");

}

if (getpid() == 1)

freeze();

return retval;

}