/*** 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 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. 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see . ***/ #include #include #include #include #include #include #include #include #include #include #include #ifdef HAVE_SECCOMP #include #endif #ifdef HAVE_VALGRIND_VALGRIND_H #include #endif #include "sd-bus.h" #include "sd-daemon.h" #include "alloc-util.h" #include "architecture.h" #include "build.h" #include "bus-error.h" #include "bus-util.h" #include "capability-util.h" #include "clock-util.h" #include "conf-parser.h" #include "cpu-set-util.h" #include "dbus-manager.h" #include "def.h" #include "env-util.h" #include "fd-util.h" #include "fdset.h" #include "fileio.h" #include "formats-util.h" #include "fs-util.h" #include "hostname-setup.h" #include "ima-setup.h" #include "killall.h" #include "kmod-setup.h" #include "load-fragment.h" #include "log.h" #include "loopback-setup.h" #include "machine-id-setup.h" #include "manager.h" #include "missing.h" #include "mount-setup.h" #include "pager.h" #include "parse-util.h" #include "proc-cmdline.h" #include "process-util.h" #include "raw-clone.h" #include "rlimit-util.h" #include "selinux-setup.h" #include "selinux-util.h" #include "signal-util.h" #include "smack-setup.h" #include "special.h" #include "stat-util.h" #include "stdio-util.h" #include "strv.h" #include "switch-root.h" #include "terminal-util.h" #include "umask-util.h" #include "user-util.h" #include "virt.h" #include "watchdog.h" static enum { ACTION_RUN, ACTION_HELP, ACTION_VERSION, ACTION_TEST, ACTION_DUMP_CONFIGURATION_ITEMS } arg_action = ACTION_RUN; static char *arg_default_unit = NULL; static bool arg_system = false; static bool arg_dump_core = true; static int arg_crash_chvt = -1; static bool arg_crash_shell = false; static bool arg_crash_reboot = false; static bool arg_confirm_spawn = false; static ShowStatus arg_show_status = _SHOW_STATUS_UNSET; static bool arg_switched_root = false; static bool arg_no_pager = false; static char ***arg_join_controllers = NULL; static ExecOutput arg_default_std_output = EXEC_OUTPUT_JOURNAL; static ExecOutput arg_default_std_error = EXEC_OUTPUT_INHERIT; static usec_t arg_default_restart_usec = DEFAULT_RESTART_USEC; static usec_t arg_default_timeout_start_usec = DEFAULT_TIMEOUT_USEC; static usec_t arg_default_timeout_stop_usec = DEFAULT_TIMEOUT_USEC; static usec_t arg_default_start_limit_interval = DEFAULT_START_LIMIT_INTERVAL; static unsigned arg_default_start_limit_burst = DEFAULT_START_LIMIT_BURST; static usec_t arg_runtime_watchdog = 0; static usec_t arg_shutdown_watchdog = 10 * USEC_PER_MINUTE; static char **arg_default_environment = NULL; static struct rlimit *arg_default_rlimit[_RLIMIT_MAX] = {}; static uint64_t arg_capability_bounding_set = CAP_ALL; static nsec_t arg_timer_slack_nsec = NSEC_INFINITY; static usec_t arg_default_timer_accuracy_usec = 1 * USEC_PER_MINUTE; static Set* arg_syscall_archs = NULL; static FILE* arg_serialization = NULL; static bool arg_default_cpu_accounting = false; static bool arg_default_io_accounting = false; static bool arg_default_blockio_accounting = false; static bool arg_default_memory_accounting = false; static bool arg_default_tasks_accounting = true; static uint64_t arg_default_tasks_max = UINT64_MAX; static sd_id128_t arg_machine_id = {}; noreturn static void freeze_or_reboot(void) { if (arg_crash_reboot) { log_notice("Rebooting in 10s..."); (void) sleep(10); log_notice("Rebooting now..."); (void) reboot(RB_AUTOBOOT); log_emergency_errno(errno, "Failed to reboot: %m"); } log_emergency("Freezing execution."); freeze(); } noreturn static void crash(int sig) { struct sigaction sa; pid_t pid; if (getpid() != 1) /* Pass this on immediately, if this is not PID 1 */ (void) raise(sig); else if (!arg_dump_core) log_emergency("Caught <%s>, not dumping core.", signal_to_string(sig)); else { sa = (struct sigaction) { .sa_handler = nop_signal_handler, .sa_flags = SA_NOCLDSTOP|SA_RESTART, }; /* We want to wait for the core process, hence let's enable SIGCHLD */ (void) sigaction(SIGCHLD, &sa, NULL); pid = raw_clone(SIGCHLD); if (pid < 0) log_emergency_errno(errno, "Caught <%s>, cannot fork for core dump: %m", signal_to_string(sig)); else if (pid == 0) { /* Enable default signal handler for core dump */ sa = (struct sigaction) { .sa_handler = SIG_DFL, }; (void) sigaction(sig, &sa, NULL); /* Don't limit the coredump size */ (void) setrlimit(RLIMIT_CORE, &RLIMIT_MAKE_CONST(RLIM_INFINITY)); /* Just to be sure... */ (void) chdir("/"); /* Raise the signal again */ pid = raw_getpid(); (void) kill(pid, sig); /* raise() would kill the parent */ assert_not_reached("We shouldn't be here..."); _exit(EXIT_FAILURE); } else { siginfo_t status; int r; /* Order things nicely. */ r = wait_for_terminate(pid, &status); if (r < 0) log_emergency_errno(r, "Caught <%s>, waitpid() failed: %m", signal_to_string(sig)); else if (status.si_code != CLD_DUMPED) log_emergency("Caught <%s>, core dump failed (child "PID_FMT", code=%s, status=%i/%s).", signal_to_string(sig), pid, sigchld_code_to_string(status.si_code), status.si_status, strna(status.si_code == CLD_EXITED ? exit_status_to_string(status.si_status, EXIT_STATUS_FULL) : signal_to_string(status.si_status))); else log_emergency("Caught <%s>, dumped core as pid "PID_FMT".", signal_to_string(sig), pid); } } if (arg_crash_chvt >= 0) (void) chvt(arg_crash_chvt); sa = (struct sigaction) { .sa_handler = SIG_IGN, .sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART, }; /* Let the kernel reap children for us */ (void) sigaction(SIGCHLD, &sa, NULL); if (arg_crash_shell) { log_notice("Executing crash shell in 10s..."); (void) sleep(10); pid = raw_clone(SIGCHLD); if (pid < 0) log_emergency_errno(errno, "Failed to fork off crash shell: %m"); else if (pid == 0) { (void) setsid(); (void) make_console_stdio(); (void) execle("/bin/sh", "/bin/sh", NULL, environ); log_emergency_errno(errno, "execle() failed: %m"); _exit(EXIT_FAILURE); } else { log_info("Spawned crash shell as PID "PID_FMT".", pid); (void) wait_for_terminate(pid, NULL); } } freeze_or_reboot(); } static void install_crash_handler(void) { static const struct sigaction sa = { .sa_handler = crash, .sa_flags = SA_NODEFER, /* So that we can raise the signal again from the signal handler */ }; int r; /* We ignore the return value here, since, we don't mind if we * cannot set up a crash handler */ r = sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1); if (r < 0) log_debug_errno(r, "I had trouble setting up the crash handler, ignoring: %m"); } static int console_setup(void) { _cleanup_close_ int tty_fd = -1; int r; tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC); if (tty_fd < 0) return log_error_errno(tty_fd, "Failed to open /dev/console: %m"); /* We don't want to force text mode. plymouth may be showing * pictures already from initrd. */ r = reset_terminal_fd(tty_fd, false); if (r < 0) return log_error_errno(r, "Failed to reset /dev/console: %m"); return 0; } static int parse_crash_chvt(const char *value) { int b; if (safe_atoi(value, &arg_crash_chvt) >= 0) return 0; b = parse_boolean(value); if (b < 0) return b; if (b > 0) arg_crash_chvt = 0; /* switch to where kmsg goes */ else arg_crash_chvt = -1; /* turn off switching */ return 0; } static int set_machine_id(const char *m) { sd_id128_t t; assert(m); if (sd_id128_from_string(m, &t) < 0) return -EINVAL; if (sd_id128_is_null(t)) return -EINVAL; arg_machine_id = t; return 0; } static int parse_proc_cmdline_item(const char *key, const char *value) { int r; assert(key); if (streq(key, "systemd.unit") && value) { if (!in_initrd()) return free_and_strdup(&arg_default_unit, value); } else if (streq(key, "rd.systemd.unit") && value) { if (in_initrd()) return free_and_strdup(&arg_default_unit, value); } else if (streq(key, "systemd.dump_core") && value) { r = parse_boolean(value); if (r < 0) log_warning("Failed to parse dump core switch %s. Ignoring.", value); else arg_dump_core = r; } else if (streq(key, "systemd.crash_chvt") && value) { if (parse_crash_chvt(value) < 0) log_warning("Failed to parse crash chvt switch %s. Ignoring.", value); } else if (streq(key, "systemd.crash_shell") && value) { r = parse_boolean(value); if (r < 0) log_warning("Failed to parse crash shell switch %s. Ignoring.", value); else arg_crash_shell = r; } else if (streq(key, "systemd.crash_reboot") && value) { r = parse_boolean(value); if (r < 0) log_warning("Failed to parse crash reboot switch %s. Ignoring.", value); else arg_crash_reboot = r; } else if (streq(key, "systemd.confirm_spawn") && value) { r = parse_boolean(value); if (r < 0) log_warning("Failed to parse confirm spawn switch %s. Ignoring.", value); else arg_confirm_spawn = r; } else if (streq(key, "systemd.show_status") && value) { r = parse_show_status(value, &arg_show_status); if (r < 0) log_warning("Failed to parse show status switch %s. Ignoring.", value); } else if (streq(key, "systemd.default_standard_output") && value) { r = exec_output_from_string(value); if (r < 0) log_warning("Failed to parse default standard output switch %s. Ignoring.", value); else arg_default_std_output = r; } else if (streq(key, "systemd.default_standard_error") && value) { r = exec_output_from_string(value); if (r < 0) log_warning("Failed to parse default standard error switch %s. Ignoring.", value); else arg_default_std_error = r; } else if (streq(key, "systemd.setenv") && value) { if (env_assignment_is_valid(value)) { char **env; env = strv_env_set(arg_default_environment, value); if (env) arg_default_environment = env; else log_warning_errno(ENOMEM, "Setting environment variable '%s' failed, ignoring: %m", value); } else log_warning("Environment variable name '%s' is not valid. Ignoring.", value); } else if (streq(key, "systemd.machine_id") && value) { r = set_machine_id(value); if (r < 0) log_warning("MachineID '%s' is not valid. Ignoring.", value); } else if (streq(key, "quiet") && !value) { if (arg_show_status == _SHOW_STATUS_UNSET) arg_show_status = SHOW_STATUS_AUTO; } else if (streq(key, "debug") && !value) { /* Note that log_parse_environment() handles 'debug' * too, and sets the log level to LOG_DEBUG. */ if (detect_container() > 0) log_set_target(LOG_TARGET_CONSOLE); } else if (!value) { const char *target; /* SysV compatibility */ target = runlevel_to_target(key); if (target) return free_and_strdup(&arg_default_unit, target); } else if (streq(key, "systemd.default_timeout_start_sec") && value) { r = parse_sec(value, &arg_default_timeout_start_usec); if (r < 0) log_warning_errno(r, "Failed to parse default start timeout: %s, ignoring.", value); if (arg_default_timeout_start_usec <= 0) arg_default_timeout_start_usec = USEC_INFINITY; } return 0; } #define DEFINE_SETTER(name, func, descr) \ static int name(const char *unit, \ const char *filename, \ unsigned line, \ const char *section, \ unsigned section_line, \ const char *lvalue, \ int ltype, \ const char *rvalue, \ void *data, \ void *userdata) { \ \ int r; \ \ assert(filename); \ assert(lvalue); \ assert(rvalue); \ \ r = func(rvalue); \ if (r < 0) \ log_syntax(unit, LOG_ERR, filename, line, r, \ "Invalid " descr "'%s': %m", \ rvalue); \ \ return 0; \ } DEFINE_SETTER(config_parse_level2, log_set_max_level_from_string, "log level") DEFINE_SETTER(config_parse_target, log_set_target_from_string, "target") DEFINE_SETTER(config_parse_color, log_show_color_from_string, "color" ) DEFINE_SETTER(config_parse_location, log_show_location_from_string, "location") static int config_parse_cpu_affinity2( const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { _cleanup_cpu_free_ cpu_set_t *c = NULL; int ncpus; ncpus = parse_cpu_set_and_warn(rvalue, &c, unit, filename, line, lvalue); if (ncpus < 0) return ncpus; if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0) log_warning("Failed to set CPU affinity: %m"); return 0; } static int config_parse_show_status( const char* unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { int k; ShowStatus *b = data; assert(filename); assert(lvalue); assert(rvalue); assert(data); k = parse_show_status(rvalue, b); if (k < 0) { log_syntax(unit, LOG_ERR, filename, line, k, "Failed to parse show status setting, ignoring: %s", rvalue); return 0; } return 0; } static int config_parse_crash_chvt( const char* unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { int r; assert(filename); assert(lvalue); assert(rvalue); r = parse_crash_chvt(rvalue); if (r < 0) { log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse CrashChangeVT= setting, ignoring: %s", rvalue); return 0; } return 0; } static int config_parse_join_controllers(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata) { const char *whole_rvalue = rvalue; unsigned n = 0; assert(filename); assert(lvalue); assert(rvalue); arg_join_controllers = strv_free_free(arg_join_controllers); for (;;) { _cleanup_free_ char *word = NULL; char **l; int r; r = extract_first_word(&rvalue, &word, WHITESPACE, EXTRACT_QUOTES); if (r < 0) { log_syntax(unit, LOG_ERR, filename, line, r, "Invalid value for %s: %s", lvalue, whole_rvalue); return r; } if (r == 0) break; l = strv_split(word, ","); if (!l) return log_oom(); strv_uniq(l); if (strv_length(l) <= 1) { strv_free(l); continue; } if (!arg_join_controllers) { arg_join_controllers = new(char**, 2); if (!arg_join_controllers) { strv_free(l); return log_oom(); } arg_join_controllers[0] = l; arg_join_controllers[1] = NULL; n = 1; } else { char ***a; char ***t; t = new0(char**, n+2); if (!t) { strv_free(l); return log_oom(); } n = 0; for (a = arg_join_controllers; *a; a++) { if (strv_overlap(*a, l)) { if (strv_extend_strv(&l, *a, false) < 0) { strv_free(l); strv_free_free(t); return log_oom(); } } else { char **c; c = strv_copy(*a); if (!c) { strv_free(l); strv_free_free(t); return log_oom(); } t[n++] = c; } } t[n++] = strv_uniq(l); strv_free_free(arg_join_controllers); arg_join_controllers = t; } } if (!isempty(rvalue)) log_syntax(unit, LOG_ERR, filename, line, 0, "Trailing garbage, ignoring."); return 0; } static int parse_config_file(void) { const ConfigTableItem items[] = { { "Manager", "LogLevel", config_parse_level2, 0, NULL }, { "Manager", "LogTarget", config_parse_target, 0, NULL }, { "Manager", "LogColor", config_parse_color, 0, NULL }, { "Manager", "LogLocation", config_parse_location, 0, NULL }, { "Manager", "DumpCore", config_parse_bool, 0, &arg_dump_core }, { "Manager", "CrashChVT", /* legacy */ config_parse_crash_chvt, 0, NULL }, { "Manager", "CrashChangeVT", config_parse_crash_chvt, 0, NULL }, { "Manager", "CrashShell", config_parse_bool, 0, &arg_crash_shell }, { "Manager", "CrashReboot", config_parse_bool, 0, &arg_crash_reboot }, { "Manager", "ShowStatus", config_parse_show_status, 0, &arg_show_status }, { "Manager", "CPUAffinity", config_parse_cpu_affinity2, 0, NULL }, { "Manager", "JoinControllers", config_parse_join_controllers, 0, &arg_join_controllers }, { "Manager", "RuntimeWatchdogSec", config_parse_sec, 0, &arg_runtime_watchdog }, { "Manager", "ShutdownWatchdogSec", config_parse_sec, 0, &arg_shutdown_watchdog }, { "Manager", "CapabilityBoundingSet", config_parse_capability_set, 0, &arg_capability_bounding_set }, #ifdef HAVE_SECCOMP { "Manager", "SystemCallArchitectures", config_parse_syscall_archs, 0, &arg_syscall_archs }, #endif { "Manager", "TimerSlackNSec", config_parse_nsec, 0, &arg_timer_slack_nsec }, { "Manager", "DefaultTimerAccuracySec", config_parse_sec, 0, &arg_default_timer_accuracy_usec }, { "Manager", "DefaultStandardOutput", config_parse_output, 0, &arg_default_std_output }, { "Manager", "DefaultStandardError", config_parse_output, 0, &arg_default_std_error }, { "Manager", "DefaultTimeoutStartSec", config_parse_sec, 0, &arg_default_timeout_start_usec }, { "Manager", "DefaultTimeoutStopSec", config_parse_sec, 0, &arg_default_timeout_stop_usec }, { "Manager", "DefaultRestartSec", config_parse_sec, 0, &arg_default_restart_usec }, { "Manager", "DefaultStartLimitInterval", config_parse_sec, 0, &arg_default_start_limit_interval }, /* obsolete alias */ { "Manager", "DefaultStartLimitIntervalSec",config_parse_sec, 0, &arg_default_start_limit_interval }, { "Manager", "DefaultStartLimitBurst", config_parse_unsigned, 0, &arg_default_start_limit_burst }, { "Manager", "DefaultEnvironment", config_parse_environ, 0, &arg_default_environment }, { "Manager", "DefaultLimitCPU", config_parse_limit, RLIMIT_CPU, arg_default_rlimit }, { "Manager", "DefaultLimitFSIZE", config_parse_limit, RLIMIT_FSIZE, arg_default_rlimit }, { "Manager", "DefaultLimitDATA", config_parse_limit, RLIMIT_DATA, arg_default_rlimit }, { "Manager", "DefaultLimitSTACK", config_parse_limit, RLIMIT_STACK, arg_default_rlimit }, { "Manager", "DefaultLimitCORE", config_parse_limit, RLIMIT_CORE, arg_default_rlimit }, { "Manager", "DefaultLimitRSS", config_parse_limit, RLIMIT_RSS, arg_default_rlimit }, { "Manager", "DefaultLimitNOFILE", config_parse_limit, RLIMIT_NOFILE, arg_default_rlimit }, { "Manager", "DefaultLimitAS", config_parse_limit, RLIMIT_AS, arg_default_rlimit }, { "Manager", "DefaultLimitNPROC", config_parse_limit, RLIMIT_NPROC, arg_default_rlimit }, { "Manager", "DefaultLimitMEMLOCK", config_parse_limit, RLIMIT_MEMLOCK, arg_default_rlimit }, { "Manager", "DefaultLimitLOCKS", config_parse_limit, RLIMIT_LOCKS, arg_default_rlimit }, { "Manager", "DefaultLimitSIGPENDING", config_parse_limit, RLIMIT_SIGPENDING, arg_default_rlimit }, { "Manager", "DefaultLimitMSGQUEUE", config_parse_limit, RLIMIT_MSGQUEUE, arg_default_rlimit }, { "Manager", "DefaultLimitNICE", config_parse_limit, RLIMIT_NICE, arg_default_rlimit }, { "Manager", "DefaultLimitRTPRIO", config_parse_limit, RLIMIT_RTPRIO, arg_default_rlimit }, { "Manager", "DefaultLimitRTTIME", config_parse_limit, RLIMIT_RTTIME, arg_default_rlimit }, { "Manager", "DefaultCPUAccounting", config_parse_bool, 0, &arg_default_cpu_accounting }, { "Manager", "DefaultIOAccounting", config_parse_bool, 0, &arg_default_io_accounting }, { "Manager", "DefaultBlockIOAccounting", config_parse_bool, 0, &arg_default_blockio_accounting }, { "Manager", "DefaultMemoryAccounting", config_parse_bool, 0, &arg_default_memory_accounting }, { "Manager", "DefaultTasksAccounting", config_parse_bool, 0, &arg_default_tasks_accounting }, { "Manager", "DefaultTasksMax", config_parse_tasks_max, 0, &arg_default_tasks_max }, {} }; const char *fn, *conf_dirs_nulstr; fn = arg_system ? PKGSYSCONFDIR "/system.conf" : PKGSYSCONFDIR "/user.conf"; conf_dirs_nulstr = arg_system ? CONF_PATHS_NULSTR("systemd/system.conf.d") : CONF_PATHS_NULSTR("systemd/user.conf.d"); config_parse_many(fn, conf_dirs_nulstr, "Manager\0", config_item_table_lookup, items, false, NULL); /* Traditionally "0" was used to turn off the default unit timeouts. Fix this up so that we used USEC_INFINITY * like everywhere else. */ if (arg_default_timeout_start_usec <= 0) arg_default_timeout_start_usec = USEC_INFINITY; if (arg_default_timeout_stop_usec <= 0) arg_default_timeout_stop_usec = USEC_INFINITY; return 0; } static void manager_set_defaults(Manager *m) { assert(m); m->default_timer_accuracy_usec = arg_default_timer_accuracy_usec; m->default_std_output = arg_default_std_output; m->default_std_error = arg_default_std_error; m->default_timeout_start_usec = arg_default_timeout_start_usec; m->default_timeout_stop_usec = arg_default_timeout_stop_usec; m->default_restart_usec = arg_default_restart_usec; m->default_start_limit_interval = arg_default_start_limit_interval; m->default_start_limit_burst = arg_default_start_limit_burst; m->default_cpu_accounting = arg_default_cpu_accounting; m->default_io_accounting = arg_default_io_accounting; m->default_blockio_accounting = arg_default_blockio_accounting; m->default_memory_accounting = arg_default_memory_accounting; m->default_tasks_accounting = arg_default_tasks_accounting; m->default_tasks_max = arg_default_tasks_max; manager_set_default_rlimits(m, arg_default_rlimit); manager_environment_add(m, NULL, arg_default_environment); } 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_NO_PAGER, ARG_VERSION, ARG_DUMP_CONFIGURATION_ITEMS, ARG_DUMP_CORE, ARG_CRASH_CHVT, ARG_CRASH_SHELL, ARG_CRASH_REBOOT, ARG_CONFIRM_SPAWN, ARG_SHOW_STATUS, ARG_DESERIALIZE, ARG_SWITCHED_ROOT, ARG_DEFAULT_STD_OUTPUT, ARG_DEFAULT_STD_ERROR, ARG_MACHINE_ID }; 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 }, { "no-pager", no_argument, NULL, ARG_NO_PAGER }, { "help", no_argument, NULL, 'h' }, { "version", no_argument, NULL, ARG_VERSION }, { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS }, { "dump-core", optional_argument, NULL, ARG_DUMP_CORE }, { "crash-chvt", required_argument, NULL, ARG_CRASH_CHVT }, { "crash-shell", optional_argument, NULL, ARG_CRASH_SHELL }, { "crash-reboot", optional_argument, NULL, ARG_CRASH_REBOOT }, { "confirm-spawn", optional_argument, NULL, ARG_CONFIRM_SPAWN }, { "show-status", optional_argument, NULL, ARG_SHOW_STATUS }, { "deserialize", required_argument, NULL, ARG_DESERIALIZE }, { "switched-root", no_argument, NULL, ARG_SWITCHED_ROOT }, { "default-standard-output", required_argument, NULL, ARG_DEFAULT_STD_OUTPUT, }, { "default-standard-error", required_argument, NULL, ARG_DEFAULT_STD_ERROR, }, { "machine-id", required_argument, NULL, ARG_MACHINE_ID }, {} }; int c, r; assert(argc >= 1); assert(argv); if (getpid() == 1) opterr = 0; while ((c = getopt_long(argc, argv, "hDbsz:", options, NULL)) >= 0) switch (c) { case ARG_LOG_LEVEL: r = log_set_max_level_from_string(optarg); if (r < 0) { log_error("Failed to parse log level %s.", optarg); return r; } break; case ARG_LOG_TARGET: r = log_set_target_from_string(optarg); if (r < 0) { log_error("Failed to parse log target %s.", optarg); return r; } break; case ARG_LOG_COLOR: if (optarg) { r = log_show_color_from_string(optarg); if (r < 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) { r = log_show_location_from_string(optarg); if (r < 0) { log_error("Failed to parse log location setting %s.", optarg); return r; } } else log_show_location(true); break; case ARG_DEFAULT_STD_OUTPUT: r = exec_output_from_string(optarg); if (r < 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: r = exec_output_from_string(optarg); if (r < 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: r = free_and_strdup(&arg_default_unit, optarg); if (r < 0) return log_error_errno(r, "Failed to set default unit %s: %m", optarg); break; case ARG_SYSTEM: arg_system = true; break; case ARG_USER: arg_system = false; break; case ARG_TEST: arg_action = ACTION_TEST; break; case ARG_NO_PAGER: arg_no_pager = true; break; case ARG_VERSION: arg_action = ACTION_VERSION; break; case ARG_DUMP_CONFIGURATION_ITEMS: arg_action = ACTION_DUMP_CONFIGURATION_ITEMS; break; case ARG_DUMP_CORE: if (!optarg) arg_dump_core = true; else { r = parse_boolean(optarg); if (r < 0) return log_error_errno(r, "Failed to parse dump core boolean: %s", optarg); arg_dump_core = r; } break; case ARG_CRASH_CHVT: r = parse_crash_chvt(optarg); if (r < 0) return log_error_errno(r, "Failed to parse crash virtual terminal index: %s", optarg); break; case ARG_CRASH_SHELL: if (!optarg) arg_crash_shell = true; else { r = parse_boolean(optarg); if (r < 0) return log_error_errno(r, "Failed to parse crash shell boolean: %s", optarg); arg_crash_shell = r; } break; case ARG_CRASH_REBOOT: if (!optarg) arg_crash_reboot = true; else { r = parse_boolean(optarg); if (r < 0) return log_error_errno(r, "Failed to parse crash shell boolean: %s", optarg); arg_crash_reboot = r; } break; case ARG_CONFIRM_SPAWN: r = optarg ? parse_boolean(optarg) : 1; if (r < 0) { log_error("Failed to parse confirm spawn boolean %s.", optarg); return r; } arg_confirm_spawn = r; break; case ARG_SHOW_STATUS: if (optarg) { r = parse_show_status(optarg, &arg_show_status); if (r < 0) { log_error("Failed to parse show status boolean %s.", optarg); return r; } } else arg_show_status = SHOW_STATUS_YES; break; case ARG_DESERIALIZE: { int fd; FILE *f; r = safe_atoi(optarg, &fd); if (r < 0 || fd < 0) { log_error("Failed to parse deserialize option %s.", optarg); return -EINVAL; } (void) fd_cloexec(fd, true); f = fdopen(fd, "r"); if (!f) return log_error_errno(errno, "Failed to open serialization fd: %m"); safe_fclose(arg_serialization); arg_serialization = f; break; } case ARG_SWITCHED_ROOT: arg_switched_root = true; break; case ARG_MACHINE_ID: r = set_machine_id(optarg); if (r < 0) { log_error("MachineID '%s' is not valid.", optarg); return r; } break; case 'h': arg_action = ACTION_HELP; break; case 'D': log_set_max_level(LOG_DEBUG); break; case 'b': case 's': case 'z': /* Just to eat away the sysvinit kernel * cmdline args without getopt() error * messages that we'll parse in * parse_proc_cmdline_word() or ignore. */ case '?': if (getpid() != 1) return -EINVAL; else return 0; default: assert_not_reached("Unhandled option code."); } if (optind < argc && getpid() != 1) { /* Hmm, when we aren't run as init system * let's complain about excess arguments */ 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" " --no-pager Do not pipe output into a pager\n" " --dump-configuration-items Dump understood unit configuration items\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[=BOOL] Dump core on crash\n" " --crash-vt=NR Change to specified VT on crash\n" " --crash-reboot[=BOOL] Reboot on crash\n" " --crash-shell[=BOOL] Run shell on crash\n" " --confirm-spawn[=BOOL] Ask for confirmation when spawning processes\n" " --show-status[=BOOL] Show status updates on the console during bootup\n" " --log-target=TARGET Set log target (console, journal, kmsg, journal-or-kmsg, null)\n" " --log-level=LEVEL Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n" " --log-color[=BOOL] Highlight important log messages\n" " --log-location[=BOOL] 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, bool switching_root) { _cleanup_fdset_free_ FDSet *fds = NULL; _cleanup_fclose_ FILE *f = NULL; int r; assert(m); assert(_f); assert(_fds); r = manager_open_serialization(m, &f); if (r < 0) return log_error_errno(r, "Failed to create serialization file: %m"); /* Make sure nothing is really destructed when we shut down */ m->n_reloading++; bus_manager_send_reloading(m, true); fds = fdset_new(); if (!fds) return log_oom(); r = manager_serialize(m, f, fds, switching_root); if (r < 0) return log_error_errno(r, "Failed to serialize state: %m"); if (fseeko(f, 0, SEEK_SET) == (off_t) -1) return log_error_errno(errno, "Failed to rewind serialization fd: %m"); r = fd_cloexec(fileno(f), false); if (r < 0) return log_error_errno(r, "Failed to disable O_CLOEXEC for serialization: %m"); r = fdset_cloexec(fds, false); if (r < 0) return log_error_errno(r, "Failed to disable O_CLOEXEC for serialization fds: %m"); *_f = f; *_fds = fds; f = NULL; fds = NULL; return 0; } static int bump_rlimit_nofile(struct rlimit *saved_rlimit) { struct rlimit nl; int r; assert(saved_rlimit); /* Save the original RLIMIT_NOFILE so that we can reset it * later when transitioning from the initrd to the main * systemd or suchlike. */ if (getrlimit(RLIMIT_NOFILE, saved_rlimit) < 0) return log_error_errno(errno, "Reading RLIMIT_NOFILE failed: %m"); /* Make sure forked processes get the default kernel setting */ if (!arg_default_rlimit[RLIMIT_NOFILE]) { struct rlimit *rl; rl = newdup(struct rlimit, saved_rlimit, 1); if (!rl) return log_oom(); arg_default_rlimit[RLIMIT_NOFILE] = rl; } /* Bump up the resource limit for ourselves substantially */ nl.rlim_cur = nl.rlim_max = 64*1024; r = setrlimit_closest(RLIMIT_NOFILE, &nl); if (r < 0) return log_error_errno(r, "Setting RLIMIT_NOFILE failed: %m"); return 0; } static void test_usr(void) { /* Check that /usr is not a separate fs */ if (dir_is_empty("/usr") <= 0) return; log_warning("/usr appears to be on its own filesystem and is not already mounted. This is not a supported setup. " "Some things will probably break (sometimes even silently) in mysterious ways. " "Consult http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken for more information."); } static int initialize_join_controllers(void) { /* By default, mount "cpu" + "cpuacct" together, and "net_cls" * + "net_prio". We'd like to add "cpuset" to the mix, but * "cpuset" doesn't really work for groups with no initialized * attributes. */ arg_join_controllers = new(char**, 3); if (!arg_join_controllers) return -ENOMEM; arg_join_controllers[0] = strv_new("cpu", "cpuacct", NULL); if (!arg_join_controllers[0]) goto oom; arg_join_controllers[1] = strv_new("net_cls", "net_prio", NULL); if (!arg_join_controllers[1]) goto oom; arg_join_controllers[2] = NULL; return 0; oom: arg_join_controllers = strv_free_free(arg_join_controllers); return -ENOMEM; } static int enforce_syscall_archs(Set *archs) { #ifdef HAVE_SECCOMP scmp_filter_ctx *seccomp; Iterator i; void *id; int r; seccomp = seccomp_init(SCMP_ACT_ALLOW); if (!seccomp) return log_oom(); SET_FOREACH(id, arg_syscall_archs, i) { r = seccomp_arch_add(seccomp, PTR_TO_UINT32(id) - 1); if (r == -EEXIST) continue; if (r < 0) { log_error_errno(r, "Failed to add architecture to seccomp: %m"); goto finish; } } r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0); if (r < 0) { log_error_errno(r, "Failed to unset NO_NEW_PRIVS: %m"); goto finish; } r = seccomp_load(seccomp); if (r < 0) log_error_errno(r, "Failed to add install architecture seccomp: %m"); finish: seccomp_release(seccomp); return r; #else return 0; #endif } static int status_welcome(void) { _cleanup_free_ char *pretty_name = NULL, *ansi_color = NULL; int r; r = parse_env_file("/etc/os-release", NEWLINE, "PRETTY_NAME", &pretty_name, "ANSI_COLOR", &ansi_color, NULL); if (r == -ENOENT) r = parse_env_file("/usr/lib/os-release", NEWLINE, "PRETTY_NAME", &pretty_name, "ANSI_COLOR", &ansi_color, NULL); if (r < 0 && r != -ENOENT) log_warning_errno(r, "Failed to read os-release file: %m"); if (log_get_show_color()) return status_printf(NULL, false, false, "\nWelcome to \x1B[%sm%s\x1B[0m!\n", isempty(ansi_color) ? "1" : ansi_color, isempty(pretty_name) ? "Linux" : pretty_name); else return status_printf(NULL, false, false, "\nWelcome to %s!\n", isempty(pretty_name) ? "Linux" : pretty_name); } static int write_container_id(void) { const char *c; int r; c = getenv("container"); if (isempty(c)) return 0; RUN_WITH_UMASK(0022) r = write_string_file("/run/systemd/container", c, WRITE_STRING_FILE_CREATE); if (r < 0) return log_warning_errno(r, "Failed to write /run/systemd/container, ignoring: %m"); return 1; } static int bump_unix_max_dgram_qlen(void) { _cleanup_free_ char *qlen = NULL; unsigned long v; int r; /* Let's bump the net.unix.max_dgram_qlen sysctl. The kernel * default of 16 is simply too low. We set the value really * really early during boot, so that it is actually applied to * all our sockets, including the $NOTIFY_SOCKET one. */ r = read_one_line_file("/proc/sys/net/unix/max_dgram_qlen", &qlen); if (r < 0) return log_warning_errno(r, "Failed to read AF_UNIX datagram queue length, ignoring: %m"); r = safe_atolu(qlen, &v); if (r < 0) return log_warning_errno(r, "Failed to parse AF_UNIX datagram queue length, ignoring: %m"); if (v >= DEFAULT_UNIX_MAX_DGRAM_QLEN) return 0; qlen = mfree(qlen); if (asprintf(&qlen, "%lu\n", DEFAULT_UNIX_MAX_DGRAM_QLEN) < 0) return log_oom(); r = write_string_file("/proc/sys/net/unix/max_dgram_qlen", qlen, 0); if (r < 0) return log_full_errno(IN_SET(r, -EROFS, -EPERM, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, "Failed to bump AF_UNIX datagram queue length, ignoring: %m"); return 1; } static int fixup_environment(void) { _cleanup_free_ char *term = NULL; int r; /* We expect the environment to be set correctly * if run inside a container. */ if (detect_container() > 0) return 0; /* When started as PID1, the kernel uses /dev/console * for our stdios and uses TERM=linux whatever the * backend device used by the console. We try to make * a better guess here since some consoles might not * have support for color mode for example. * * However if TERM was configured through the kernel * command line then leave it alone. */ r = get_proc_cmdline_key("TERM=", &term); if (r < 0) return r; if (r == 0) { term = strdup(default_term_for_tty("/dev/console")); if (!term) return -ENOMEM; } if (setenv("TERM", term, 1) < 0) return -errno; return 0; } int main(int argc, char *argv[]) { Manager *m = NULL; int r, retval = EXIT_FAILURE; usec_t before_startup, after_startup; char timespan[FORMAT_TIMESPAN_MAX]; FDSet *fds = NULL; bool reexecute = false; const char *shutdown_verb = NULL; dual_timestamp initrd_timestamp = DUAL_TIMESTAMP_NULL; dual_timestamp userspace_timestamp = DUAL_TIMESTAMP_NULL; dual_timestamp kernel_timestamp = DUAL_TIMESTAMP_NULL; dual_timestamp security_start_timestamp = DUAL_TIMESTAMP_NULL; dual_timestamp security_finish_timestamp = DUAL_TIMESTAMP_NULL; static char systemd[] = "systemd"; bool skip_setup = false; unsigned j; bool loaded_policy = false; bool arm_reboot_watchdog = false; bool queue_default_job = false; bool empty_etc = false; char *switch_root_dir = NULL, *switch_root_init = NULL; struct rlimit saved_rlimit_nofile = RLIMIT_MAKE_CONST(0); const char *error_message = NULL; #ifdef HAVE_SYSV_COMPAT if (getpid() != 1 && strstr(program_invocation_short_name, "init")) { /* This is compatibility support for SysV, where * calling init as a user is identical to telinit. */ execv(SYSTEMCTL_BINARY_PATH, argv); log_error_errno(errno, "Failed to exec " SYSTEMCTL_BINARY_PATH ": %m"); return 1; } #endif dual_timestamp_from_monotonic(&kernel_timestamp, 0); dual_timestamp_get(&userspace_timestamp); /* Determine if this is a reexecution or normal bootup. We do * the full command line parsing much later, so let's just * have a quick peek here. */ if (strv_find(argv+1, "--deserialize")) skip_setup = true; /* If we have switched root, do all the special setup * things */ if (strv_find(argv+1, "--switched-root")) skip_setup = false; /* If we get started via the /sbin/init symlink then we are called 'init'. After a subsequent reexecution we are then called 'systemd'. That is confusing, hence let's call us systemd right-away. */ program_invocation_short_name = systemd; prctl(PR_SET_NAME, systemd); saved_argv = argv; saved_argc = argc; log_set_upgrade_syslog_to_journal(true); /* Disable the umask logic */ if (getpid() == 1) umask(0); if (getpid() == 1 && detect_container() <= 0) { /* Running outside of a container as PID 1 */ arg_system = true; log_set_target(LOG_TARGET_KMSG); log_open(); if (in_initrd()) initrd_timestamp = userspace_timestamp; if (!skip_setup) { r = mount_setup_early(); if (r < 0) { error_message = "Failed to early mount API filesystems"; goto finish; } dual_timestamp_get(&security_start_timestamp); if (mac_selinux_setup(&loaded_policy) < 0) { error_message = "Failed to load SELinux policy"; goto finish; } else if (mac_smack_setup(&loaded_policy) < 0) { error_message = "Failed to load SMACK policy"; goto finish; } else if (ima_setup() < 0) { error_message = "Failed to load IMA policy"; goto finish; } dual_timestamp_get(&security_finish_timestamp); } if (mac_selinux_init() < 0) { error_message = "Failed to initialize SELinux policy"; goto finish; } if (!skip_setup) { if (clock_is_localtime(NULL) > 0) { int min; /* * The very first call of settimeofday() also does a time warp in the kernel. * * In the rtc-in-local time mode, we set the kernel's timezone, and rely on * external tools to take care of maintaining the RTC and do all adjustments. * This matches the behavior of Windows, which leaves the RTC alone if the * registry tells that the RTC runs in UTC. */ r = clock_set_timezone(&min); if (r < 0) log_error_errno(r, "Failed to apply local time delta, ignoring: %m"); else log_info("RTC configured in localtime, applying delta of %i minutes to system time.", min); } else if (!in_initrd()) { /* * Do a dummy very first call to seal the kernel's time warp magic. * * Do not call this from inside the initrd. The initrd might not * carry /etc/adjtime with LOCAL, but the real system could be set up * that way. In such case, we need to delay the time-warp or the sealing * until we reach the real system. * * Do no set the kernel's timezone. The concept of local time cannot * be supported reliably, the time will jump or be incorrect at every daylight * saving time change. All kernel local time concepts will be treated * as UTC that way. */ (void) clock_reset_timewarp(); } r = clock_apply_epoch(); if (r < 0) log_error_errno(r, "Current system time is before build time, but cannot correct: %m"); else if (r > 0) log_info("System time before build time, advancing clock."); } /* Set the default for later on, but don't actually * open the logs like this for now. Note that if we * are transitioning from the initrd there might still * be journal fd open, and we shouldn't attempt * opening that before we parsed /proc/cmdline which * might redirect output elsewhere. */ log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); } else if (getpid() == 1) { /* Running inside a container, as PID 1 */ arg_system = true; log_set_target(LOG_TARGET_CONSOLE); log_close_console(); /* force reopen of /dev/console */ log_open(); /* For the later on, see above... */ log_set_target(LOG_TARGET_JOURNAL); /* clear the kernel timestamp, * because we are in a container */ kernel_timestamp = DUAL_TIMESTAMP_NULL; } else { /* Running as user instance */ arg_system = false; log_set_target(LOG_TARGET_AUTO); log_open(); /* clear the kernel timestamp, * because we are not PID 1 */ kernel_timestamp = DUAL_TIMESTAMP_NULL; } if (getpid() == 1) { /* Don't limit the core dump size, so that coredump handlers such as systemd-coredump (which honour the limit) * will process core dumps for system services by default. */ (void) setrlimit(RLIMIT_CORE, &RLIMIT_MAKE_CONST(RLIM_INFINITY)); /* But at the same time, turn off the core_pattern logic by default, so that no coredumps are stored * until the systemd-coredump tool is enabled via sysctl. */ if (!skip_setup) (void) write_string_file("/proc/sys/kernel/core_pattern", "|/bin/false", 0); } if (arg_system) { if (fixup_environment() < 0) { error_message = "Failed to fix up PID1 environment"; goto finish; } /* Try to figure out if we can use colors with the console. No * need to do that for user instances since they never log * into the console. */ log_show_color(colors_enabled()); make_null_stdio(); } /* Initialize default unit */ r = free_and_strdup(&arg_default_unit, SPECIAL_DEFAULT_TARGET); if (r < 0) { log_emergency_errno(r, "Failed to set default unit %s: %m", SPECIAL_DEFAULT_TARGET); error_message = "Failed to set default unit"; goto finish; } r = initialize_join_controllers(); if (r < 0) { error_message = "Failed to initialize cgroup controllers"; goto finish; } /* Mount /proc, /sys and friends, so that /proc/cmdline and * /proc/$PID/fd is available. */ if (getpid() == 1) { /* Load the kernel modules early, so that we kdbus.ko is loaded before kdbusfs shall be mounted */ if (!skip_setup) kmod_setup(); r = mount_setup(loaded_policy); if (r < 0) { error_message = "Failed to mount API filesystems"; goto finish; } } /* Reset all signal handlers. */ (void) reset_all_signal_handlers(); (void) ignore_signals(SIGNALS_IGNORE, -1); arg_default_tasks_max = system_tasks_max_scale(15U, 100U); /* 15% the system PIDs equals 4915 by default. */ if (parse_config_file() < 0) { error_message = "Failed to parse config file"; goto finish; } if (arg_system) { r = parse_proc_cmdline(parse_proc_cmdline_item); if (r < 0) log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); } /* Note that this also parses bits from the kernel command * line, including "debug". */ log_parse_environment(); if (parse_argv(argc, argv) < 0) { error_message = "Failed to parse commandline arguments"; goto finish; } if (arg_action == ACTION_TEST && geteuid() == 0) { log_error("Don't run test mode as root."); goto finish; } if (!arg_system && arg_action == ACTION_RUN && sd_booted() <= 0) { log_error("Trying to run as user instance, but the system has not been booted with systemd."); goto finish; } if (arg_system && arg_action == ACTION_RUN && running_in_chroot() > 0) { log_error("Cannot be run in a chroot() environment."); goto finish; } if (arg_action == ACTION_TEST) skip_setup = true; if (arg_action == ACTION_TEST || arg_action == ACTION_HELP) pager_open(arg_no_pager, false); if (arg_action == ACTION_HELP) { retval = help(); goto finish; } else if (arg_action == ACTION_VERSION) { retval = version(); goto finish; } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) { pager_open(arg_no_pager, false); unit_dump_config_items(stdout); retval = EXIT_SUCCESS; goto finish; } if (!arg_system && !getenv("XDG_RUNTIME_DIR")) { log_error("Trying to run as user instance, but $XDG_RUNTIME_DIR is not set."); goto finish; } assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST); /* Close logging fds, in order not to confuse fdset below */ log_close(); /* Remember open file descriptors for later deserialization */ r = fdset_new_fill(&fds); if (r < 0) { log_emergency_errno(r, "Failed to allocate fd set: %m"); error_message = "Failed to allocate fd set"; goto finish; } else fdset_cloexec(fds, true); if (arg_serialization) assert_se(fdset_remove(fds, fileno(arg_serialization)) >= 0); if (arg_system) /* Become a session leader if we aren't one yet. */ setsid(); /* Move out of the way, so that we won't block unmounts */ assert_se(chdir("/") == 0); /* Reset the console, but only if this is really init and we * are freshly booted */ if (arg_system && arg_action == ACTION_RUN) { /* If we are init, we connect stdin/stdout/stderr to * /dev/null and make sure we don't have a controlling * tty. */ release_terminal(); if (getpid() == 1 && !skip_setup) console_setup(); } /* Open the logging devices, if possible and necessary */ log_open(); if (arg_show_status == _SHOW_STATUS_UNSET) arg_show_status = SHOW_STATUS_YES; /* Make sure we leave a core dump without panicing the * kernel. */ if (getpid() == 1) { install_crash_handler(); r = mount_cgroup_controllers(arg_join_controllers); if (r < 0) goto finish; } if (arg_system) { int v; log_info(PACKAGE_STRING " running in %ssystem mode. (" SYSTEMD_FEATURES ")", arg_action == ACTION_TEST ? "test " : "" ); v = detect_virtualization(); if (v > 0) log_info("Detected virtualization %s.", virtualization_to_string(v)); write_container_id(); log_info("Detected architecture %s.", architecture_to_string(uname_architecture())); if (in_initrd()) log_info("Running in initial RAM disk."); /* Let's check whether /etc is already populated. We * don't actually really check for that, but use * /etc/machine-id as flag file. This allows container * managers and installers to provision a couple of * files already. If the container manager wants to * provision the machine ID itself it should pass * $container_uuid to PID 1. */ empty_etc = access("/etc/machine-id", F_OK) < 0; if (empty_etc) log_info("Running with unpopulated /etc."); } else { _cleanup_free_ char *t; t = uid_to_name(getuid()); log_debug(PACKAGE_STRING " running in %suser mode for user "UID_FMT"/%s. (" SYSTEMD_FEATURES ")", arg_action == ACTION_TEST ? " test" : "", getuid(), t); } if (arg_system && !skip_setup) { if (arg_show_status > 0) status_welcome(); hostname_setup(); machine_id_setup(NULL, arg_machine_id, NULL); loopback_setup(); bump_unix_max_dgram_qlen(); test_usr(); } if (arg_system && arg_runtime_watchdog > 0 && arg_runtime_watchdog != USEC_INFINITY) watchdog_set_timeout(&arg_runtime_watchdog); if (arg_timer_slack_nsec != NSEC_INFINITY) if (prctl(PR_SET_TIMERSLACK, arg_timer_slack_nsec) < 0) log_error_errno(errno, "Failed to adjust timer slack: %m"); if (!cap_test_all(arg_capability_bounding_set)) { r = capability_bounding_set_drop_usermode(arg_capability_bounding_set); if (r < 0) { log_emergency_errno(r, "Failed to drop capability bounding set of usermode helpers: %m"); error_message = "Failed to drop capability bounding set of usermode helpers"; goto finish; } r = capability_bounding_set_drop(arg_capability_bounding_set, true); if (r < 0) { log_emergency_errno(r, "Failed to drop capability bounding set: %m"); error_message = "Failed to drop capability bounding set"; goto finish; } } if (arg_syscall_archs) { r = enforce_syscall_archs(arg_syscall_archs); if (r < 0) { error_message = "Failed to set syscall architectures"; goto finish; } } if (!arg_system) /* Become reaper of our children */ if (prctl(PR_SET_CHILD_SUBREAPER, 1) < 0) log_warning_errno(errno, "Failed to make us a subreaper: %m"); if (arg_system) { bump_rlimit_nofile(&saved_rlimit_nofile); if (empty_etc) { r = unit_file_preset_all(UNIT_FILE_SYSTEM, false, NULL, UNIT_FILE_PRESET_ENABLE_ONLY, false, NULL, 0); if (r < 0) log_full_errno(r == -EEXIST ? LOG_NOTICE : LOG_WARNING, r, "Failed to populate /etc with preset unit settings, ignoring: %m"); else log_info("Populated /etc with preset unit settings."); } } r = manager_new(arg_system ? UNIT_FILE_SYSTEM : UNIT_FILE_USER, arg_action == ACTION_TEST, &m); if (r < 0) { log_emergency_errno(r, "Failed to allocate manager object: %m"); error_message = "Failed to allocate manager object"; goto finish; } m->confirm_spawn = arg_confirm_spawn; m->runtime_watchdog = arg_runtime_watchdog; m->shutdown_watchdog = arg_shutdown_watchdog; m->userspace_timestamp = userspace_timestamp; m->kernel_timestamp = kernel_timestamp; m->initrd_timestamp = initrd_timestamp; m->security_start_timestamp = security_start_timestamp; m->security_finish_timestamp = security_finish_timestamp; manager_set_defaults(m); manager_set_show_status(m, arg_show_status); manager_set_first_boot(m, empty_etc); /* Remember whether we should queue the default job */ queue_default_job = !arg_serialization || arg_switched_root; before_startup = now(CLOCK_MONOTONIC); r = manager_startup(m, arg_serialization, fds); if (r < 0) log_error_errno(r, "Failed to fully start up daemon: %m"); /* This will close all file descriptors that were opened, but * not claimed by any unit. */ fds = fdset_free(fds); arg_serialization = safe_fclose(arg_serialization); if (queue_default_job) { _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; Unit *target = NULL; Job *default_unit_job; log_debug("Activating default unit: %s", arg_default_unit); r = manager_load_unit(m, arg_default_unit, NULL, &error, &target); if (r < 0) log_error("Failed to load default target: %s", bus_error_message(&error, r)); else if (target->load_state == UNIT_ERROR || target->load_state == UNIT_NOT_FOUND) log_error_errno(target->load_error, "Failed to load default target: %m"); else if (target->load_state == UNIT_MASKED) log_error("Default target masked."); if (!target || target->load_state != UNIT_LOADED) { log_info("Trying to load rescue target..."); r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target); if (r < 0) { log_emergency("Failed to load rescue target: %s", bus_error_message(&error, r)); error_message = "Failed to load rescue target"; goto finish; } else if (target->load_state == UNIT_ERROR || target->load_state == UNIT_NOT_FOUND) { log_emergency_errno(target->load_error, "Failed to load rescue target: %m"); error_message = "Failed to load rescue target"; goto finish; } else if (target->load_state == UNIT_MASKED) { log_emergency("Rescue target masked."); error_message = "Rescue target masked"; goto finish; } } assert(target->load_state == UNIT_LOADED); if (arg_action == ACTION_TEST) { printf("-> By units:\n"); manager_dump_units(m, stdout, "\t"); } r = manager_add_job(m, JOB_START, target, JOB_ISOLATE, &error, &default_unit_job); if (r == -EPERM) { log_debug("Default target could not be isolated, starting instead: %s", bus_error_message(&error, r)); sd_bus_error_free(&error); r = manager_add_job(m, JOB_START, target, JOB_REPLACE, &error, &default_unit_job); if (r < 0) { log_emergency("Failed to start default target: %s", bus_error_message(&error, r)); error_message = "Failed to start default target"; goto finish; } } else if (r < 0) { log_emergency("Failed to isolate default target: %s", bus_error_message(&error, r)); error_message = "Failed to isolate default target"; goto finish; } m->default_unit_job_id = default_unit_job->id; after_startup = now(CLOCK_MONOTONIC); log_full(arg_action == ACTION_TEST ? LOG_INFO : LOG_DEBUG, "Loaded units and determined initial transaction in %s.", format_timespan(timespan, sizeof(timespan), after_startup - before_startup, 100 * USEC_PER_MSEC)); if (arg_action == ACTION_TEST) { printf("-> By jobs:\n"); manager_dump_jobs(m, stdout, "\t"); retval = EXIT_SUCCESS; goto finish; } } for (;;) { r = manager_loop(m); if (r < 0) { log_emergency_errno(r, "Failed to run main loop: %m"); error_message = "Failed to run main loop"; goto finish; } switch (m->exit_code) { case MANAGER_RELOAD: log_info("Reloading."); r = parse_config_file(); if (r < 0) log_error("Failed to parse config file."); manager_set_defaults(m); r = manager_reload(m); if (r < 0) log_error_errno(r, "Failed to reload: %m"); break; case MANAGER_REEXECUTE: if (prepare_reexecute(m, &arg_serialization, &fds, false) < 0) { error_message = "Failed to prepare for reexecution"; goto finish; } reexecute = true; log_notice("Reexecuting."); goto finish; case MANAGER_SWITCH_ROOT: /* Steal the switch root parameters */ switch_root_dir = m->switch_root; switch_root_init = m->switch_root_init; m->switch_root = m->switch_root_init = NULL; if (!switch_root_init) if (prepare_reexecute(m, &arg_serialization, &fds, true) < 0) { error_message = "Failed to prepare for reexecution"; goto finish; } reexecute = true; log_notice("Switching root."); goto finish; case MANAGER_EXIT: retval = m->return_value; if (MANAGER_IS_USER(m)) { log_debug("Exit."); goto finish; } /* fallthrough */ case MANAGER_REBOOT: case MANAGER_POWEROFF: case MANAGER_HALT: case MANAGER_KEXEC: { static const char * const table[_MANAGER_EXIT_CODE_MAX] = { [MANAGER_EXIT] = "exit", [MANAGER_REBOOT] = "reboot", [MANAGER_POWEROFF] = "poweroff", [MANAGER_HALT] = "halt", [MANAGER_KEXEC] = "kexec" }; assert_se(shutdown_verb = table[m->exit_code]); arm_reboot_watchdog = m->exit_code == MANAGER_REBOOT; log_notice("Shutting down."); goto finish; } default: assert_not_reached("Unknown exit code."); } } finish: pager_close(); if (m) arg_shutdown_watchdog = m->shutdown_watchdog; m = manager_free(m); for (j = 0; j < ELEMENTSOF(arg_default_rlimit); j++) arg_default_rlimit[j] = mfree(arg_default_rlimit[j]); arg_default_unit = mfree(arg_default_unit); arg_join_controllers = strv_free_free(arg_join_controllers); arg_default_environment = strv_free(arg_default_environment); arg_syscall_archs = set_free(arg_syscall_archs); mac_selinux_finish(); if (reexecute) { const char **args; unsigned i, args_size; /* Close and disarm the watchdog, so that the new * instance can reinitialize it, but doesn't get * rebooted while we do that */ watchdog_close(true); /* Reset the RLIMIT_NOFILE to the kernel default, so * that the new systemd can pass the kernel default to * its child processes */ if (saved_rlimit_nofile.rlim_cur > 0) (void) setrlimit(RLIMIT_NOFILE, &saved_rlimit_nofile); if (switch_root_dir) { /* Kill all remaining processes from the * initrd, but don't wait for them, so that we * can handle the SIGCHLD for them after * deserializing. */ broadcast_signal(SIGTERM, false, true); /* And switch root with MS_MOVE, because we remove the old directory afterwards and detach it. */ r = switch_root(switch_root_dir, "/mnt", true, MS_MOVE); if (r < 0) log_error_errno(r, "Failed to switch root, trying to continue: %m"); } /* Reopen the console */ (void) make_console_stdio(); args_size = MAX(6, argc+1); args = newa(const char*, args_size); if (!switch_root_init) { char sfd[DECIMAL_STR_MAX(int) + 1]; /* First try to spawn ourselves with the right * path, and with full serialization. We do * this only if the user didn't specify an * explicit init to spawn. */ assert(arg_serialization); assert(fds); xsprintf(sfd, "%i", fileno(arg_serialization)); i = 0; args[i++] = SYSTEMD_BINARY_PATH; if (switch_root_dir) args[i++] = "--switched-root"; args[i++] = arg_system ? "--system" : "--user"; args[i++] = "--deserialize"; args[i++] = sfd; args[i++] = NULL; assert(i <= args_size); /* * We want valgrind to print its memory usage summary before reexecution. * Valgrind won't do this is on its own on exec(), but it will do it on exit(). * Hence, to ensure we get a summary here, fork() off a child, let it exit() cleanly, * so that it prints the summary, and wait() for it in the parent, before proceeding into the exec(). */ valgrind_summary_hack(); (void) execv(args[0], (char* const*) args); } /* Try the fallback, if there is any, without any * serialization. We pass the original argv[] and * envp[]. (Well, modulo the ordering changes due to * getopt() in argv[], and some cleanups in envp[], * but let's hope that doesn't matter.) */ arg_serialization = safe_fclose(arg_serialization); fds = fdset_free(fds); for (j = 1, i = 1; j < (unsigned) argc; j++) args[i++] = argv[j]; args[i++] = NULL; assert(i <= args_size); /* Reenable any blocked signals, especially important * if we switch from initial ramdisk to init=... */ (void) reset_all_signal_handlers(); (void) reset_signal_mask(); if (switch_root_init) { args[0] = switch_root_init; (void) execv(args[0], (char* const*) args); log_warning_errno(errno, "Failed to execute configured init, trying fallback: %m"); } args[0] = "/sbin/init"; (void) execv(args[0], (char* const*) args); if (errno == ENOENT) { log_warning("No /sbin/init, trying fallback"); args[0] = "/bin/sh"; args[1] = NULL; (void) execv(args[0], (char* const*) args); log_error_errno(errno, "Failed to execute /bin/sh, giving up: %m"); } else log_warning_errno(errno, "Failed to execute /sbin/init, giving up: %m"); } arg_serialization = safe_fclose(arg_serialization); fds = fdset_free(fds); #ifdef HAVE_VALGRIND_VALGRIND_H /* If we are PID 1 and running under valgrind, then let's exit * here explicitly. valgrind will only generate nice output on * exit(), not on exec(), hence let's do the former not the * latter here. */ if (getpid() == 1 && RUNNING_ON_VALGRIND) return 0; #endif if (shutdown_verb) { char log_level[DECIMAL_STR_MAX(int) + 1]; char exit_code[DECIMAL_STR_MAX(uint8_t) + 1]; const char* command_line[11] = { SYSTEMD_SHUTDOWN_BINARY_PATH, shutdown_verb, "--log-level", log_level, "--log-target", }; unsigned pos = 5; _cleanup_strv_free_ char **env_block = NULL; assert(command_line[pos] == NULL); env_block = strv_copy(environ); xsprintf(log_level, "%d", log_get_max_level()); switch (log_get_target()) { case LOG_TARGET_KMSG: case LOG_TARGET_JOURNAL_OR_KMSG: case LOG_TARGET_SYSLOG_OR_KMSG: command_line[pos++] = "kmsg"; break; case LOG_TARGET_NULL: command_line[pos++] = "null"; break; case LOG_TARGET_CONSOLE: default: command_line[pos++] = "console"; break; }; if (log_get_show_color()) command_line[pos++] = "--log-color"; if (log_get_show_location()) command_line[pos++] = "--log-location"; if (streq(shutdown_verb, "exit")) { command_line[pos++] = "--exit-code"; command_line[pos++] = exit_code; xsprintf(exit_code, "%d", retval); } assert(pos < ELEMENTSOF(command_line)); if (arm_reboot_watchdog && arg_shutdown_watchdog > 0 && arg_shutdown_watchdog != USEC_INFINITY) { char *e; /* If we reboot let's set the shutdown * watchdog and tell the shutdown binary to * repeatedly ping it */ r = watchdog_set_timeout(&arg_shutdown_watchdog); watchdog_close(r < 0); /* Tell the binary how often to ping, ignore failure */ if (asprintf(&e, "WATCHDOG_USEC="USEC_FMT, arg_shutdown_watchdog) > 0) (void) strv_push(&env_block, e); } else watchdog_close(true); /* Avoid the creation of new processes forked by the * kernel; at this point, we will not listen to the * signals anyway */ if (detect_container() <= 0) (void) cg_uninstall_release_agent(SYSTEMD_CGROUP_CONTROLLER); execve(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line, env_block); log_error_errno(errno, "Failed to execute shutdown binary, %s: %m", getpid() == 1 ? "freezing" : "quitting"); } if (getpid() == 1) { if (error_message) manager_status_printf(NULL, STATUS_TYPE_EMERGENCY, ANSI_HIGHLIGHT_RED "!!!!!!" ANSI_NORMAL, "%s, freezing.", error_message); freeze_or_reboot(); } return retval; }