[thirdparty/systemd.git] / main.c

/*-*- Mode: C; c-basic-offset: 8 -*-*/

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  systemd 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 General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#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 "manager.h"
#include "log.h"
#include "mount-setup.h"
#include "hostname-setup.h"
#include "load-fragment.h"

static enum {
        ACTION_RUN,
        ACTION_HELP,
        ACTION_TEST,
        ACTION_DUMP_CONFIGURATION_ITEMS
} action = ACTION_RUN;

static char *default_unit = NULL;
static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;

static bool dump_core = true;
static bool crash_shell = false;
static int crash_chvt = -1;

static bool confirm_spawn = false;

_noreturn static void freeze(void) {
        for (;;)
                pause();
}

_noreturn static void crash(int sig) {

        if (!dump_core)
                log_error("Caught <%s>, not dumping core.", strsignal(sig));
        else {
                pid_t pid;

                if ((pid = fork()) < 0)
                        log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));

                else if (pid == 0) {
                        struct sigaction sa;
                        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 {
                        int status, r;

                        /* Order things nicely. */
                        if ((r = waitpid(pid, &status, 0)) < 0)
                                log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
                        else if (!WCOREDUMP(status))
                                log_error("Caught <%s>, core dump failed.", strsignal(sig));
                        else
                                log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
                }
        }

        if (crash_chvt)
                chvt(crash_chvt);

        if (crash_shell) {
                sigset_t mask;

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

                /* Make sure the signal is not delivered inside the
                 * exec() */
                assert_se(sigemptyset(&mask) == 0);
                assert_se(sigaddset(&mask, sig) == 0);
                assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);

                ignore_signal(sig);

                execl("/bin/sh", "/bin/sh", NULL);
                log_error("execl() failed: %s", strerror(errno));
        }

        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;

        assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
        assert_se(sigaction(SIGILL, &sa, NULL) == 0);
        assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
        assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
        assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
        assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
}

static int console_setup(void) {
        int tty_fd = -1, null_fd = -1, r = 0;

        /* If we are init, we connect stdout/stderr to /dev/console
         * and stdin to /dev/null and make sure we don't have a
         * controlling tty. */

        release_terminal();

        if ((tty_fd = open_terminal("/dev/console", O_WRONLY)) < 0) {
                log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
                r = -tty_fd;
                goto finish;
        }

        if ((null_fd = open("/dev/null", O_RDONLY)) < 0) {
                log_error("Failed to open /dev/null: %m");
                r = -errno;
                goto finish;
        }

        assert(tty_fd >= 3);
        assert(null_fd >= 3);

        if (reset_terminal(tty_fd) < 0)
                log_error("Failed to reset /dev/console: %m");

        if (dup2(tty_fd, STDOUT_FILENO) < 0 ||
            dup2(tty_fd, STDERR_FILENO) < 0 ||
            dup2(null_fd, STDIN_FILENO) < 0) {
                log_error("Failed to dup2() device: %m");
                r = -errno;
                goto finish;
        }

        r = 0;

finish:
        if (tty_fd >= 0)
                close_nointr(tty_fd);

        if (null_fd >= 0)
                close_nointr(null_fd);

        return r;
}

static int set_default_unit(const char *u) {
        char *c;

        assert(u);

        if (!(c = strdup(u)))
                return -ENOMEM;

        free(default_unit);
        default_unit = c;
        return 0;
}

static int parse_proc_cmdline_word(const char *word) {

        static const char * const rlmap[] = {
                "single", SPECIAL_RUNLEVEL1_TARGET,
                "-s",     SPECIAL_RUNLEVEL1_TARGET,
                "s",      SPECIAL_RUNLEVEL1_TARGET,
                "S",      SPECIAL_RUNLEVEL1_TARGET,
                "1",      SPECIAL_RUNLEVEL1_TARGET,
                "2",      SPECIAL_RUNLEVEL2_TARGET,
                "3",      SPECIAL_RUNLEVEL3_TARGET,
                "4",      SPECIAL_RUNLEVEL4_TARGET,
                "5",      SPECIAL_RUNLEVEL5_TARGET
        };

        if (startswith(word, "systemd.default="))
                return set_default_unit(word + 16);

        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.dump_core=")) {
                int r;

                if ((r = parse_boolean(word + 18)) < 0)
                        log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
                else
                        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
                        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
                        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
                        crash_chvt = k;

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

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

                log_info("Supported kernel switches:");
                log_info("systemd.default=UNIT                     Default unit to start");
                log_info("systemd.log_target=console|kmsg|syslog   Log target");
                log_info("systemd.log_level=LEVEL                  Log level");
                log_info("systemd.dump_core=0|1                    Dump core on crash");
                log_info("systemd.crash_shell=0|1                  On crash run shell");
                log_info("systemd.crash_chvt=N                     Change to VT #N on crash");
                log_info("systemd.confirm_spawn=0|1                Confirm every process spawn");

        } 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 parse_proc_cmdline(void) {
        char *line;
        int r;
        char *w;
        size_t l;
        char *state;

        if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
                log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
                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_DEFAULT,
                ARG_RUNNING_AS,
                ARG_TEST,
                ARG_DUMP_CONFIGURATION_ITEMS,
                ARG_CONFIRM_SPAWN
        };

        static const struct option options[] = {
                { "log-level",  required_argument, NULL, ARG_LOG_LEVEL },
                { "log-target", required_argument, NULL, ARG_LOG_TARGET },
                { "default",    required_argument, NULL, ARG_DEFAULT },
                { "running-as", required_argument, NULL, ARG_RUNNING_AS },
                { "test",       no_argument,       NULL, ARG_TEST },
                { "help",       no_argument,       NULL, 'h' },
                { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
                { "confirm-spawn", no_argument,    NULL, ARG_CONFIRM_SPAWN },
                { NULL,         0,                 NULL, 0 }
        };

        int c, r;

        assert(argc >= 1);
        assert(argv);

        while ((c = getopt_long(argc, argv, "h", 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_DEFAULT:

                        if ((r = set_default_unit(optarg)) < 0) {
                                log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
                                return r;
                        }

                        break;

                case ARG_RUNNING_AS: {
                        ManagerRunningAs as;

                        if ((as = manager_running_as_from_string(optarg)) < 0) {
                                log_error("Failed to parse running as value %s", optarg);
                                return -EINVAL;
                        }

                        running_as = as;
                        break;
                }

                case ARG_TEST:
                        action = ACTION_TEST;
                        break;

                case ARG_DUMP_CONFIGURATION_ITEMS:
                        action = ACTION_DUMP_CONFIGURATION_ITEMS;
                        break;

                case ARG_CONFIRM_SPAWN:
                        confirm_spawn = true;
                        break;

                case 'h':
                        action = ACTION_HELP;
                        break;

                case '?':
                        return -EINVAL;

                default:
                        log_error("Unknown option code %c", c);
                        return -EINVAL;
                }

        return 0;
}

static int help(void) {

        printf("%s [options]\n\n"
               "  -h --help                      Show this help\n"
               "     --default=UNIT              Set default unit\n"
               "     --log-level=LEVEL           Set log level\n"
               "     --log-target=TARGET         Set log target (console, syslog, kmsg)\n"
               "     --running-as=AS             Set running as (init, system, session)\n"
               "     --test                      Determine startup sequence, dump it and exit\n"
               "     --dump-configuration-items  Dump understood unit configuration items\n"
               "     --confirm-spawn             Ask for confirmation when spawning processes\n",
               __progname);

        return 0;
}

int main(int argc, char *argv[]) {
        Manager *m = NULL;
        Unit *target = NULL;
        Job *job = NULL;
        int r, retval = 1;

        if (getpid() == 1)
                running_as = MANAGER_INIT;
        else if (getuid() == 0)
                running_as = MANAGER_SYSTEM;
        else
                running_as = MANAGER_SESSION;

        if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
                goto finish;

        /* Mount /proc, /sys and friends, so that /proc/cmdline and
         * /proc/$PID/fd is available. */
        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_signal(SIGKILL);
        ignore_signal(SIGPIPE);

        /* Close all open files */
        assert_se(close_all_fds(NULL, 0) == 0);

        if (running_as != MANAGER_SESSION)
                if (parse_proc_cmdline() < 0)
                        goto finish;

        log_parse_environment();

        if (parse_argv(argc, argv) < 0)
                goto finish;

        if (action == ACTION_HELP) {
                retval = help();
                goto finish;
        } else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
                unit_dump_config_items(stdout);
                retval = 0;
                goto finish;
        }

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

        /* Set up PATH unless it is already set */
        setenv("PATH",
               "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
               running_as == MANAGER_INIT);

        /* Move out of the way, so that we won't block unmounts */
        assert_se(chdir("/")  == 0);

        if (running_as != MANAGER_SESSION) {
                /* Become a session leader if we aren't one yet. */
                setsid();

                /* Disable the umask logic */
                umask(0);
        }

        if (running_as == MANAGER_INIT)
                console_setup();

        /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
        dbus_connection_set_change_sigpipe(FALSE);

        /* Open the logging devices, if possible and necessary */
        log_open_syslog();
        log_open_kmsg();

        /* Make sure we leave a core dump without panicing the
         * kernel. */
        if (getpid() == 1)
                install_crash_handler();

        log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));

        if (running_as == MANAGER_INIT)
                hostname_setup();

        if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
                log_error("Failed to allocate manager object: %s", strerror(-r));
                goto finish;
        }

        if ((r = manager_coldplug(m)) < 0) {
                log_error("Failed to retrieve coldplug information: %s", strerror(-r));
                goto finish;
        }

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

        if ((r = manager_load_unit(m, default_unit, &target)) < 0) {
                log_error("Failed to load default target: %s", strerror(-r));

                log_info("Trying to load rescue target...");
                if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, &target)) < 0) {
                        log_error("Failed to load rescue target: %s", strerror(-r));
                        goto finish;
                }
        }

        if (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, &job)) < 0) {
                log_error("Failed to start default target: %s", strerror(-r));
                goto finish;
        }

        if (action == ACTION_TEST) {
                printf("→ By jobs:\n");
                manager_dump_jobs(m, stdout, "\t");

                if (getpid() == 1)
                        pause();

                retval = 0;
                goto finish;
        }

        if ((r = manager_loop(m)) < 0) {
                log_error("Failed to run mainloop: %s", strerror(-r));
                goto finish;
        }

        retval = 0;

        log_debug("Exit.");

finish:
        if (m)
                manager_free(m);

        free(default_unit);

        dbus_shutdown();

        if (getpid() == 1)
                freeze();

        return retval;
}
Commit	Line	Data
60918275 LP	1	/-- Mode: C; c-basic-offset: 8 --/
60918275 LP	2
a7334b09 LP	3	/***
	4	This file is part of systemd.
	5
	6	Copyright 2010 Lennart Poettering
	7
	8	systemd is free software; you can redistribute it and/or modify it
	9	under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	systemd is distributed in the hope that it will be useful, but
	14	WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	20	***/
	21
ea430986 LP	22	#include <dbus/dbus.h>
ea430986 LP	23
60918275 LP	24	#include <stdio.h>
	25	#include <errno.h>
	26	#include <string.h>
16354eff	27	#include <unistd.h>
4ade7963 LP	28	#include <sys/types.h>
4ade7963 LP	29	#include <sys/stat.h>
f170852a	30	#include <getopt.h>
97c4f35c	31	#include <signal.h>
4fc935ca	32	#include <sys/wait.h>
80876c20	33	#include <fcntl.h>
60918275 LP	34
60918275 LP	35	#include "manager.h"
16354eff	36	#include "log.h"
4ade7963	37	#include "mount-setup.h"
302e8c4c LP	38	#include "hostname-setup.h"
302e8c4c LP	39	#include "load-fragment.h"
60918275	40
f170852a LP	41	static enum {
f170852a LP	42	ACTION_RUN,
e965d56d	43	ACTION_HELP,
e537352b LP	44	ACTION_TEST,
e537352b LP	45	ACTION_DUMP_CONFIGURATION_ITEMS
f170852a LP	46	} action = ACTION_RUN;
	47
	48	static char *default_unit = NULL;
a5dab5ce	49	static ManagerRunningAs running_as = _MANAGER_RUNNING_AS_INVALID;
4fc935ca	50
97c4f35c	51	static bool dump_core = true;
601f6a1e LP	52	static bool crash_shell = false;
601f6a1e LP	53	static int crash_chvt = -1;
97c4f35c	54
80876c20 LP	55	static bool confirm_spawn = false;
80876c20 LP	56
97c4f35c LP	57	_noreturn static void freeze(void) {
	58	for (;;)
	59	pause();
	60	}
	61
	62	_noreturn static void crash(int sig) {
	63
	64	if (!dump_core)
	65	log_error("Caught <%s>, not dumping core.", strsignal(sig));
	66	else {
	67	pid_t pid;
	68
97c4f35c	69	if ((pid = fork()) < 0)
4fc935ca	70	log_error("Caught <%s>, cannot fork for core dump: %s", strsignal(sig), strerror(errno));
97c4f35c LP	71
	72	else if (pid == 0) {
	73	struct sigaction sa;
	74	struct rlimit rl;
	75
	76	/* Enable default signal handler for core dump */
	77	zero(sa);
	78	sa.sa_handler = SIG_DFL;
	79	assert_se(sigaction(sig, &sa, NULL) == 0);
	80
	81	/* Don't limit the core dump size */
	82	zero(rl);
	83	rl.rlim_cur = RLIM_INFINITY;
	84	rl.rlim_max = RLIM_INFINITY;
	85	setrlimit(RLIMIT_CORE, &rl);
	86
	87	/* Just to be sure... */
	88	assert_se(chdir("/") == 0);
	89
	90	/* Raise the signal again */
	91	raise(sig);
	92
	93	assert_not_reached("We shouldn't be here...");
	94	_exit(1);
4fc935ca LP	95
	96	} else {
	97	int status, r;
	98
	99	/* Order things nicely. */
	100	if ((r = waitpid(pid, &status, 0)) < 0)
	101	log_error("Caught <%s>, waitpid() failed: %s", strsignal(sig), strerror(errno));
	102	else if (!WCOREDUMP(status))
	103	log_error("Caught <%s>, core dump failed.", strsignal(sig));
	104	else
	105	log_error("Caught <%s>, dumped core as pid %llu.", strsignal(sig), (unsigned long long) pid);
97c4f35c LP	106	}
	107	}
	108
601f6a1e LP	109	if (crash_chvt)
	110	chvt(crash_chvt);
	111
4fc935ca	112	if (crash_shell) {
8c43883a LP	113	sigset_t mask;
8c43883a LP	114
4fc935ca LP	115	log_info("Executing crash shell in 10s...");
	116	sleep(10);
	117
8c43883a LP	118	/* Make sure the signal is not delivered inside the
	119	* exec() */
	120	assert_se(sigemptyset(&mask) == 0);
	121	assert_se(sigaddset(&mask, sig) == 0);
	122	assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
	123
c99b188e LP	124	ignore_signal(sig);
c99b188e LP	125
4fc935ca LP	126	execl("/bin/sh", "/bin/sh", NULL);
	127	log_error("execl() failed: %s", strerror(errno));
	128	}
	129
	130	log_info("Freezing execution.");
97c4f35c LP	131	freeze();
	132	}
	133
	134	static void install_crash_handler(void) {
	135	struct sigaction sa;
	136
	137	zero(sa);
	138
	139	sa.sa_handler = crash;
	140	sa.sa_flags = SA_NODEFER;
	141
	142	assert_se(sigaction(SIGSEGV, &sa, NULL) == 0);
5373d602 LP	143	assert_se(sigaction(SIGILL, &sa, NULL) == 0);
	144	assert_se(sigaction(SIGFPE, &sa, NULL) == 0);
	145	assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
	146	assert_se(sigaction(SIGQUIT, &sa, NULL) == 0);
97c4f35c LP	147	assert_se(sigaction(SIGABRT, &sa, NULL) == 0);
97c4f35c LP	148	}
f170852a	149
80876c20 LP	150	static int console_setup(void) {
	151	int tty_fd = -1, null_fd = -1, r = 0;
	152
	153	/* If we are init, we connect stdout/stderr to /dev/console
	154	* and stdin to /dev/null and make sure we don't have a
	155	* controlling tty. */
	156
	157	release_terminal();
	158
	159	if ((tty_fd = open_terminal("/dev/console", O_WRONLY)) < 0) {
	160	log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
	161	r = -tty_fd;
	162	goto finish;
	163	}
	164
	165	if ((null_fd = open("/dev/null", O_RDONLY)) < 0) {
	166	log_error("Failed to open /dev/null: %m");
	167	r = -errno;
	168	goto finish;
	169	}
	170
	171	assert(tty_fd >= 3);
	172	assert(null_fd >= 3);
	173
	174	if (reset_terminal(tty_fd) < 0)
	175	log_error("Failed to reset /dev/console: %m");
	176
	177	if (dup2(tty_fd, STDOUT_FILENO) < 0 \|\|
	178	dup2(tty_fd, STDERR_FILENO) < 0 \|\|
	179	dup2(null_fd, STDIN_FILENO) < 0) {
	180	log_error("Failed to dup2() device: %m");
	181	r = -errno;
	182	goto finish;
	183	}
	184
	185	r = 0;
	186
	187	finish:
	188	if (tty_fd >= 0)
	189	close_nointr(tty_fd);
	190
	191	if (null_fd >= 0)
	192	close_nointr(null_fd);
	193
	194	return r;
	195	}
	196
f170852a LP	197	static int set_default_unit(const char *u) {
	198	char *c;
	199
	200	assert(u);
	201
	202	if (!(c = strdup(u)))
	203	return -ENOMEM;
	204
	205	free(default_unit);
	206	default_unit = c;
	207	return 0;
	208	}
	209
	210	static int parse_proc_cmdline_word(const char *word) {
	211
	212	static const char * const rlmap[] = {
	213	"single", SPECIAL_RUNLEVEL1_TARGET,
	214	"-s", SPECIAL_RUNLEVEL1_TARGET,
	215	"s", SPECIAL_RUNLEVEL1_TARGET,
	216	"S", SPECIAL_RUNLEVEL1_TARGET,
	217	"1", SPECIAL_RUNLEVEL1_TARGET,
	218	"2", SPECIAL_RUNLEVEL2_TARGET,
	219	"3", SPECIAL_RUNLEVEL3_TARGET,
	220	"4", SPECIAL_RUNLEVEL4_TARGET,
	221	"5", SPECIAL_RUNLEVEL5_TARGET
	222	};
	223
	224	if (startswith(word, "systemd.default="))
82771ba1	225	return set_default_unit(word + 16);
f170852a LP	226
	227	else if (startswith(word, "systemd.log_target=")) {
	228
	229	if (log_set_target_from_string(word + 19) < 0)
	230	log_warning("Failed to parse log target %s. Ignoring.", word + 19);
	231
	232	} else if (startswith(word, "systemd.log_level=")) {
	233
	234	if (log_set_max_level_from_string(word + 18) < 0)
	235	log_warning("Failed to parse log level %s. Ignoring.", word + 18);
	236
4fc935ca LP	237	} else if (startswith(word, "systemd.dump_core=")) {
	238	int r;
	239
	240	if ((r = parse_boolean(word + 18)) < 0)
601f6a1e	241	log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
4fc935ca LP	242	else
	243	dump_core = r;
	244
	245	} else if (startswith(word, "systemd.crash_shell=")) {
	246	int r;
	247
	248	if ((r = parse_boolean(word + 20)) < 0)
601f6a1e	249	log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
4fc935ca LP	250	else
	251	crash_shell = r;
	252
5e7ee61c LP	253
	254	} else if (startswith(word, "systemd.confirm_spawn=")) {
	255	int r;
	256
	257	if ((r = parse_boolean(word + 22)) < 0)
	258	log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
	259	else
	260	confirm_spawn = r;
	261
601f6a1e LP	262	} else if (startswith(word, "systemd.crash_chvt=")) {
	263	int k;
	264
	265	if (safe_atoi(word + 19, &k) < 0)
	266	log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
	267	else
	268	crash_chvt = k;
	269
4fc935ca LP	270	} else if (startswith(word, "systemd.")) {
	271
	272	log_warning("Unknown kernel switch %s. Ignoring.", word);
	273
	274	log_info("Supported kernel switches:");
	275	log_info("systemd.default=UNIT Default unit to start");
	276	log_info("systemd.log_target=console\|kmsg\|syslog Log target");
	277	log_info("systemd.log_level=LEVEL Log level");
	278	log_info("systemd.dump_core=0\|1 Dump core on crash");
	279	log_info("systemd.crash_shell=0\|1 On crash run shell");
601f6a1e	280	log_info("systemd.crash_chvt=N Change to VT #N on crash");
5e7ee61c	281	log_info("systemd.confirm_spawn=0\|1 Confirm every process spawn");
4fc935ca	282
f170852a LP	283	} else {
	284	unsigned i;
	285
	286	/* SysV compatibility */
f170852a LP	287	for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
	288	if (streq(word, rlmap[i]))
	289	return set_default_unit(rlmap[i+1]);
	290	}
	291
	292	return 0;
	293	}
	294
	295	static int parse_proc_cmdline(void) {
	296	char *line;
	297	int r;
	298	char *w;
	299	size_t l;
	300	char *state;
	301
	302	if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
	303	log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(errno));
	304	return 0;
	305	}
	306
	307	FOREACH_WORD_QUOTED(w, l, line, state) {
	308	char *word;
	309
	310	if (!(word = strndup(w, l))) {
	311	r = -ENOMEM;
	312	goto finish;
	313	}
	314
	315	r = parse_proc_cmdline_word(word);
	316	free(word);
	317
	318	if (r < 0)
	319	goto finish;
	320	}
	321
	322	r = 0;
	323
	324	finish:
	325	free(line);
	326	return r;
	327	}
	328
	329	static int parse_argv(int argc, char *argv[]) {
	330
	331	enum {
	332	ARG_LOG_LEVEL = 0x100,
	333	ARG_LOG_TARGET,
a5dab5ce	334	ARG_DEFAULT,
e965d56d	335	ARG_RUNNING_AS,
e537352b	336	ARG_TEST,
80876c20 LP	337	ARG_DUMP_CONFIGURATION_ITEMS,
80876c20 LP	338	ARG_CONFIRM_SPAWN
f170852a LP	339	};
	340
	341	static const struct option options[] = {
	342	{ "log-level", required_argument, NULL, ARG_LOG_LEVEL },
	343	{ "log-target", required_argument, NULL, ARG_LOG_TARGET },
	344	{ "default", required_argument, NULL, ARG_DEFAULT },
a5dab5ce	345	{ "running-as", required_argument, NULL, ARG_RUNNING_AS },
e965d56d	346	{ "test", no_argument, NULL, ARG_TEST },
f170852a	347	{ "help", no_argument, NULL, 'h' },
e537352b	348	{ "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
80876c20	349	{ "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
f170852a LP	350	{ NULL, 0, NULL, 0 }
	351	};
	352
	353	int c, r;
	354
	355	assert(argc >= 1);
	356	assert(argv);
	357
	358	while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
	359
	360	switch (c) {
	361
	362	case ARG_LOG_LEVEL:
	363	if ((r = log_set_max_level_from_string(optarg)) < 0) {
	364	log_error("Failed to parse log level %s.", optarg);
	365	return r;
	366	}
	367
	368	break;
	369
	370	case ARG_LOG_TARGET:
	371
	372	if ((r = log_set_target_from_string(optarg)) < 0) {
	373	log_error("Failed to parse log target %s.", optarg);
	374	return r;
	375	}
	376
	377	break;
	378
	379	case ARG_DEFAULT:
	380
	381	if ((r = set_default_unit(optarg)) < 0) {
	382	log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
	383	return r;
	384	}
	385
	386	break;
	387
a5dab5ce LP	388	case ARG_RUNNING_AS: {
	389	ManagerRunningAs as;
	390
	391	if ((as = manager_running_as_from_string(optarg)) < 0) {
	392	log_error("Failed to parse running as value %s", optarg);
	393	return -EINVAL;
	394	}
	395
	396	running_as = as;
	397	break;
	398	}
	399
e965d56d LP	400	case ARG_TEST:
	401	action = ACTION_TEST;
	402	break;
	403
e537352b LP	404	case ARG_DUMP_CONFIGURATION_ITEMS:
	405	action = ACTION_DUMP_CONFIGURATION_ITEMS;
	406	break;
	407
80876c20 LP	408	case ARG_CONFIRM_SPAWN:
	409	confirm_spawn = true;
	410	break;
	411
f170852a LP	412	case 'h':
	413	action = ACTION_HELP;
	414	break;
	415
	416	case '?':
	417	return -EINVAL;
	418
	419	default:
	420	log_error("Unknown option code %c", c);
	421	return -EINVAL;
	422	}
	423
f170852a LP	424	return 0;
	425	}
	426
	427	static int help(void) {
	428
	429	printf("%s [options]\n\n"
e537352b LP	430	" -h --help Show this help\n"
	431	" --default=UNIT Set default unit\n"
	432	" --log-level=LEVEL Set log level\n"
	433	" --log-target=TARGET Set log target (console, syslog, kmsg)\n"
	434	" --running-as=AS Set running as (init, system, session)\n"
	435	" --test Determine startup sequence, dump it and exit\n"
80876c20 LP	436	" --dump-configuration-items Dump understood unit configuration items\n"
80876c20 LP	437	" --confirm-spawn Ask for confirmation when spawning processes\n",
f170852a LP	438	__progname);
	439
	440	return 0;
	441	}
	442
60918275 LP	443	int main(int argc, char *argv[]) {
60918275 LP	444	Manager *m = NULL;
87f0e418	445	Unit *target = NULL;
60918275 LP	446	Job *job = NULL;
60918275 LP	447	int r, retval = 1;
27b14a22	448
a5dab5ce LP	449	if (getpid() == 1)
	450	running_as = MANAGER_INIT;
	451	else if (getuid() == 0)
	452	running_as = MANAGER_SYSTEM;
	453	else
	454	running_as = MANAGER_SESSION;
	455
f170852a LP	456	if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
f170852a LP	457	goto finish;
60918275	458
f170852a LP	459	/* Mount /proc, /sys and friends, so that /proc/cmdline and
f170852a LP	460	* /proc/$PID/fd is available. */
d89e521e LP	461	if (mount_setup() < 0)
d89e521e LP	462	goto finish;
4ade7963 LP	463
	464	/* Reset all signal handlers. */
	465	assert_se(reset_all_signal_handlers() == 0);
	466
078e4539	467	/* If we are init, we can block sigkill. Yay. */
a337c6fc LP	468	ignore_signal(SIGKILL);
a337c6fc LP	469	ignore_signal(SIGPIPE);
078e4539	470
f170852a LP	471	/* Close all open files */
	472	assert_se(close_all_fds(NULL, 0) == 0);
	473
a5dab5ce LP	474	if (running_as != MANAGER_SESSION)
	475	if (parse_proc_cmdline() < 0)
	476	goto finish;
f170852a LP	477
	478	log_parse_environment();
	479
	480	if (parse_argv(argc, argv) < 0)
	481	goto finish;
	482
	483	if (action == ACTION_HELP) {
	484	retval = help();
	485	goto finish;
e537352b LP	486	} else if (action == ACTION_DUMP_CONFIGURATION_ITEMS) {
	487	unit_dump_config_items(stdout);
	488	retval = 0;
	489	goto finish;
f170852a LP	490	}
f170852a LP	491
e965d56d	492	assert_se(action == ACTION_RUN \|\| action == ACTION_TEST);
f170852a	493
09082a94	494	/* Set up PATH unless it is already set */
e537352b LP	495	setenv("PATH",
	496	"/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
	497	running_as == MANAGER_INIT);
09082a94	498
f170852a LP	499	/* Move out of the way, so that we won't block unmounts */
	500	assert_se(chdir("/") == 0);
	501
80876c20 LP	502	if (running_as != MANAGER_SESSION) {
	503	/* Become a session leader if we aren't one yet. */
	504	setsid();
4ade7963	505
80876c20 LP	506	/* Disable the umask logic */
	507	umask(0);
	508	}
	509
	510	if (running_as == MANAGER_INIT)
	511	console_setup();
4ade7963 LP	512
	513	/* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
	514	dbus_connection_set_change_sigpipe(FALSE);
	515
18149b9f	516	/* Open the logging devices, if possible and necessary */
4ade7963 LP	517	log_open_syslog();
	518	log_open_kmsg();
	519
5373d602 LP	520	/* Make sure we leave a core dump without panicing the
5373d602 LP	521	* kernel. */
4fc935ca LP	522	if (getpid() == 1)
4fc935ca LP	523	install_crash_handler();
97c4f35c	524
a5dab5ce LP	525	log_debug("systemd running in %s mode.", manager_running_as_to_string(running_as));
a5dab5ce LP	526
302e8c4c	527	if (running_as == MANAGER_INIT)
e537352b	528	hostname_setup();
302e8c4c	529
80876c20	530	if ((r = manager_new(running_as, confirm_spawn, &m)) < 0) {
8e274523	531	log_error("Failed to allocate manager object: %s", strerror(-r));
60918275 LP	532	goto finish;
	533	}
	534
f50e0a01 LP	535	if ((r = manager_coldplug(m)) < 0) {
	536	log_error("Failed to retrieve coldplug information: %s", strerror(-r));
	537	goto finish;
	538	}
	539
27b14a22 LP	540	log_debug("Activating default unit: %s", default_unit);
	541
	542	if ((r = manager_load_unit(m, default_unit, &target)) < 0) {
c22cbe26	543	log_error("Failed to load default target: %s", strerror(-r));
37d88da7 LP	544
	545	log_info("Trying to load rescue target...");
	546	if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, &target)) < 0) {
	547	log_error("Failed to load rescue target: %s", strerror(-r));
	548	goto finish;
	549	}
60918275 LP	550	}
60918275 LP	551
e965d56d LP	552	if (action == ACTION_TEST) {
	553	printf("→ By units:\n");
	554	manager_dump_units(m, stdout, "\t");
	555	}
d46de8a1	556
8f5847c4 LP	557	if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &job)) < 0) {
	558	log_error("Failed to start default target: %s", strerror(-r));
	559	goto finish;
	560	}
11dd41ce	561
e965d56d LP	562	if (action == ACTION_TEST) {
	563	printf("→ By jobs:\n");
	564	manager_dump_jobs(m, stdout, "\t");
	565
	566	if (getpid() == 1)
	567	pause();
	568
	569	retval = 0;
	570	goto finish;
	571	}
cea8e32e	572
c20cae32 LP	573	if ((r = manager_loop(m)) < 0) {
	574	log_error("Failed to run mainloop: %s", strerror(-r));
	575	goto finish;
	576	}
9152c765	577
60918275 LP	578	retval = 0;
60918275 LP	579
f170852a LP	580	log_debug("Exit.");
f170852a LP	581
60918275 LP	582	finish:
	583	if (m)
	584	manager_free(m);
	585
f170852a	586	free(default_unit);
b9cd2ec1	587
ea430986 LP	588	dbus_shutdown();
ea430986 LP	589
c3b3c274 LP	590	if (getpid() == 1)
	591	freeze();
	592
60918275 LP	593	return retval;
60918275 LP	594	}