/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** 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 #include #include #include #include #include #ifdef HAVE_AUDIT #include #endif #include "sd-daemon.h" #include "sd-id128.h" #include "sd-messages.h" #include "manager.h" #include "transaction.h" #include "hashmap.h" #include "macro.h" #include "strv.h" #include "log.h" #include "util.h" #include "mkdir.h" #include "ratelimit.h" #include "locale-setup.h" #include "mount-setup.h" #include "unit-name.h" #include "missing.h" #include "path-lookup.h" #include "special.h" #include "exit-status.h" #include "virt.h" #include "watchdog.h" #include "cgroup-util.h" #include "path-util.h" #include "audit-fd.h" #include "boot-timestamps.h" #include "env-util.h" #include "bus-errors.h" #include "bus-error.h" #include "bus-util.h" #include "dbus.h" #include "dbus-unit.h" #include "dbus-job.h" #include "dbus-manager.h" #include "bus-kernel.h" /* As soon as 5s passed since a unit was added to our GC queue, make sure to run a gc sweep */ #define GC_QUEUE_USEC_MAX (10*USEC_PER_SEC) /* Initial delay and the interval for printing status messages about running jobs */ #define JOBS_IN_PROGRESS_WAIT_USEC (5*USEC_PER_SEC) #define JOBS_IN_PROGRESS_PERIOD_USEC (USEC_PER_SEC / 3) #define JOBS_IN_PROGRESS_PERIOD_DIVISOR 3 /* Where clients shall send notification messages to */ #define NOTIFY_SOCKET "@/org/freedesktop/systemd1/notify" #define TIME_T_MAX (time_t)((1UL << ((sizeof(time_t) << 3) - 1)) - 1) static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata); static int manager_dispatch_signal_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata); static int manager_dispatch_time_change_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata); static int manager_dispatch_idle_pipe_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata); static int manager_dispatch_jobs_in_progress(sd_event_source *source, usec_t usec, void *userdata); static int manager_dispatch_run_queue(sd_event_source *source, void *userdata); static int manager_watch_jobs_in_progress(Manager *m) { usec_t next; assert(m); if (m->jobs_in_progress_event_source) return 0; next = now(CLOCK_MONOTONIC) + JOBS_IN_PROGRESS_WAIT_USEC; log_debug("queuing for "USEC_FMT, next); return sd_event_add_monotonic(m->event, next, 0, manager_dispatch_jobs_in_progress, m, &m->jobs_in_progress_event_source); } #define CYLON_BUFFER_EXTRA (2*(sizeof(ANSI_RED_ON)-1) + sizeof(ANSI_HIGHLIGHT_RED_ON)-1 + 2*(sizeof(ANSI_HIGHLIGHT_OFF)-1)) static void draw_cylon(char buffer[], size_t buflen, unsigned width, unsigned pos) { char *p = buffer; assert(buflen >= CYLON_BUFFER_EXTRA + width + 1); assert(pos <= width+1); /* 0 or width+1 mean that the center light is behind the corner */ if (pos > 1) { if (pos > 2) p = mempset(p, ' ', pos-2); p = stpcpy(p, ANSI_RED_ON); *p++ = '*'; } if (pos > 0 && pos <= width) { p = stpcpy(p, ANSI_HIGHLIGHT_RED_ON); *p++ = '*'; } p = stpcpy(p, ANSI_HIGHLIGHT_OFF); if (pos < width) { p = stpcpy(p, ANSI_RED_ON); *p++ = '*'; if (pos < width-1) p = mempset(p, ' ', width-1-pos); strcpy(p, ANSI_HIGHLIGHT_OFF); } } void manager_flip_auto_status(Manager *m, bool enable) { if (enable) { if (m->show_status == SHOW_STATUS_AUTO) manager_set_show_status(m, SHOW_STATUS_TEMPORARY); } else { if (m->show_status == SHOW_STATUS_TEMPORARY) manager_set_show_status(m, SHOW_STATUS_AUTO); } } static void manager_print_jobs_in_progress(Manager *m) { _cleanup_free_ char *job_of_n = NULL; Iterator i; Job *j; unsigned counter = 0, print_nr; char cylon[6 + CYLON_BUFFER_EXTRA + 1]; unsigned cylon_pos; char time[FORMAT_TIMESPAN_MAX], limit[FORMAT_TIMESPAN_MAX] = "no limit"; uint64_t x; assert(m); manager_flip_auto_status(m, true); print_nr = (m->jobs_in_progress_iteration / JOBS_IN_PROGRESS_PERIOD_DIVISOR) % m->n_running_jobs; HASHMAP_FOREACH(j, m->jobs, i) if (j->state == JOB_RUNNING && counter++ == print_nr) break; /* m->n_running_jobs must be consistent with the contents of m->jobs, * so the above loop must have succeeded in finding j. */ assert(counter == print_nr + 1); assert(j); cylon_pos = m->jobs_in_progress_iteration % 14; if (cylon_pos >= 8) cylon_pos = 14 - cylon_pos; draw_cylon(cylon, sizeof(cylon), 6, cylon_pos); m->jobs_in_progress_iteration++; if (m->n_running_jobs > 1) if (asprintf(&job_of_n, "(%u of %u) ", counter, m->n_running_jobs) < 0) job_of_n = NULL; format_timespan(time, sizeof(time), now(CLOCK_MONOTONIC) - j->begin_usec, 1*USEC_PER_SEC); if (job_get_timeout(j, &x) > 0) format_timespan(limit, sizeof(limit), x - j->begin_usec, 1*USEC_PER_SEC); manager_status_printf(m, true, cylon, "%sA %s job is running for %s (%s / %s)", strempty(job_of_n), job_type_to_string(j->type), unit_description(j->unit), time, limit); } static int manager_watch_idle_pipe(Manager *m) { int r; assert(m); if (m->idle_pipe_event_source) return 0; if (m->idle_pipe[2] < 0) return 0; r = sd_event_add_io(m->event, m->idle_pipe[2], EPOLLIN, manager_dispatch_idle_pipe_fd, m, &m->idle_pipe_event_source); if (r < 0) { log_error("Failed to watch idle pipe: %s", strerror(-r)); return r; } return 0; } static void manager_close_idle_pipe(Manager *m) { assert(m); close_pipe(m->idle_pipe); close_pipe(m->idle_pipe + 2); } static int manager_setup_time_change(Manager *m) { int r; /* We only care for the cancellation event, hence we set the * timeout to the latest possible value. */ struct itimerspec its = { .it_value.tv_sec = TIME_T_MAX, }; assert(m); assert_cc(sizeof(time_t) == sizeof(TIME_T_MAX)); /* Uses TFD_TIMER_CANCEL_ON_SET to get notifications whenever * CLOCK_REALTIME makes a jump relative to CLOCK_MONOTONIC */ m->time_change_fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC); if (m->time_change_fd < 0) { log_error("Failed to create timerfd: %m"); return -errno; } if (timerfd_settime(m->time_change_fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0) { log_debug("Failed to set up TFD_TIMER_CANCEL_ON_SET, ignoring: %m"); close_nointr_nofail(m->time_change_fd); m->time_change_fd = -1; return 0; } r = sd_event_add_io(m->event, m->time_change_fd, EPOLLIN, manager_dispatch_time_change_fd, m, &m->time_change_event_source); if (r < 0) { log_error("Failed to create time change event source: %s", strerror(-r)); return r; } log_debug("Set up TFD_TIMER_CANCEL_ON_SET timerfd."); return 0; } static int enable_special_signals(Manager *m) { _cleanup_close_ int fd = -1; assert(m); /* Enable that we get SIGINT on control-alt-del. In containers * this will fail with EPERM (older) or EINVAL (newer), so * ignore that. */ if (reboot(RB_DISABLE_CAD) < 0 && errno != EPERM && errno != EINVAL) log_warning("Failed to enable ctrl-alt-del handling: %m"); fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC); if (fd < 0) { /* Support systems without virtual console */ if (fd != -ENOENT) log_warning("Failed to open /dev/tty0: %m"); } else { /* Enable that we get SIGWINCH on kbrequest */ if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0) log_warning("Failed to enable kbrequest handling: %m"); } return 0; } static int manager_setup_signals(Manager *m) { struct sigaction sa = { .sa_handler = SIG_DFL, .sa_flags = SA_NOCLDSTOP|SA_RESTART, }; sigset_t mask; int r; assert(m); /* We are not interested in SIGSTOP and friends. */ assert_se(sigaction(SIGCHLD, &sa, NULL) == 0); assert_se(sigemptyset(&mask) == 0); sigset_add_many(&mask, SIGCHLD, /* Child died */ SIGTERM, /* Reexecute daemon */ SIGHUP, /* Reload configuration */ SIGUSR1, /* systemd/upstart: reconnect to D-Bus */ SIGUSR2, /* systemd: dump status */ SIGINT, /* Kernel sends us this on control-alt-del */ SIGWINCH, /* Kernel sends us this on kbrequest (alt-arrowup) */ SIGPWR, /* Some kernel drivers and upsd send us this on power failure */ SIGRTMIN+0, /* systemd: start default.target */ SIGRTMIN+1, /* systemd: isolate rescue.target */ SIGRTMIN+2, /* systemd: isolate emergency.target */ SIGRTMIN+3, /* systemd: start halt.target */ SIGRTMIN+4, /* systemd: start poweroff.target */ SIGRTMIN+5, /* systemd: start reboot.target */ SIGRTMIN+6, /* systemd: start kexec.target */ SIGRTMIN+13, /* systemd: Immediate halt */ SIGRTMIN+14, /* systemd: Immediate poweroff */ SIGRTMIN+15, /* systemd: Immediate reboot */ SIGRTMIN+16, /* systemd: Immediate kexec */ SIGRTMIN+20, /* systemd: enable status messages */ SIGRTMIN+21, /* systemd: disable status messages */ SIGRTMIN+22, /* systemd: set log level to LOG_DEBUG */ SIGRTMIN+23, /* systemd: set log level to LOG_INFO */ SIGRTMIN+24, /* systemd: Immediate exit (--user only) */ SIGRTMIN+26, /* systemd: set log target to journal-or-kmsg */ SIGRTMIN+27, /* systemd: set log target to console */ SIGRTMIN+28, /* systemd: set log target to kmsg */ SIGRTMIN+29, /* systemd: set log target to syslog-or-kmsg */ -1); assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); m->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); if (m->signal_fd < 0) return -errno; r = sd_event_add_io(m->event, m->signal_fd, EPOLLIN, manager_dispatch_signal_fd, m, &m->signal_event_source); if (r < 0) return r; /* Process signals a bit earlier than the rest of things, but * later that notify_fd processing, so that the notify * processing can still figure out to which process/service a * message belongs, before we reap the process. */ r = sd_event_source_set_priority(m->signal_event_source, -5); if (r < 0) return r; if (m->running_as == SYSTEMD_SYSTEM) return enable_special_signals(m); return 0; } static void manager_clean_environment(Manager *m) { assert(m); /* Let's remove some environment variables that we * need ourselves to communicate with our clients */ strv_env_unset_many( m->environment, "NOTIFY_SOCKET", "MAINPID", "MANAGERPID", "LISTEN_PID", "LISTEN_FDS", "WATCHDOG_PID", "WATCHDOG_USEC", NULL); } static int manager_default_environment(Manager *m) { assert(m); if (m->running_as == SYSTEMD_SYSTEM) { /* The system manager always starts with a clean * environment for its children. It does not import * the kernel or the parents exported variables. * * The initial passed environ is untouched to keep * /proc/self/environ valid; it is used for tagging * the init process inside containers. */ m->environment = strv_new("PATH=" DEFAULT_PATH, NULL); /* Import locale variables LC_*= from configuration */ locale_setup(&m->environment); } else { /* The user manager passes its own environment * along to its children. */ m->environment = strv_copy(environ); } if (!m->environment) return -ENOMEM; manager_clean_environment(m); strv_sort(m->environment); return 0; } int manager_new(SystemdRunningAs running_as, Manager **_m) { Manager *m; int r; assert(_m); assert(running_as >= 0); assert(running_as < _SYSTEMD_RUNNING_AS_MAX); m = new0(Manager, 1); if (!m) return -ENOMEM; #ifdef ENABLE_EFI if (detect_container(NULL) <= 0) boot_timestamps(&m->userspace_timestamp, &m->firmware_timestamp, &m->loader_timestamp); #endif m->running_as = running_as; m->exit_code = _MANAGER_EXIT_CODE_INVALID; m->idle_pipe[0] = m->idle_pipe[1] = m->idle_pipe[2] = m->idle_pipe[3] = -1; m->pin_cgroupfs_fd = m->notify_fd = m->signal_fd = m->time_change_fd = m->dev_autofs_fd = m->private_listen_fd = m->kdbus_fd = -1; m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */ r = manager_default_environment(m); if (r < 0) goto fail; r = hashmap_ensure_allocated(&m->units, string_hash_func, string_compare_func); if (r < 0) goto fail; r = hashmap_ensure_allocated(&m->jobs, trivial_hash_func, trivial_compare_func); if (r < 0) goto fail; r = hashmap_ensure_allocated(&m->cgroup_unit, string_hash_func, string_compare_func); if (r < 0) goto fail; r = hashmap_ensure_allocated(&m->watch_pids, trivial_hash_func, trivial_compare_func); if (r < 0) goto fail; r = hashmap_ensure_allocated(&m->watch_bus, string_hash_func, string_compare_func); if (r < 0) goto fail; r = sd_event_default(&m->event); if (r < 0) goto fail; r = sd_event_add_defer(m->event, manager_dispatch_run_queue, m, &m->run_queue_event_source); if (r < 0) goto fail; r = sd_event_source_set_priority(m->run_queue_event_source, SD_EVENT_PRIORITY_IDLE); if (r < 0) goto fail; r = sd_event_source_set_enabled(m->run_queue_event_source, SD_EVENT_OFF); if (r < 0) goto fail; r = manager_setup_signals(m); if (r < 0) goto fail; r = manager_setup_cgroup(m); if (r < 0) goto fail; r = manager_setup_time_change(m); if (r < 0) goto fail; m->udev = udev_new(); if (!m->udev) { r = -ENOMEM; goto fail; } /* Note that we set up neither kdbus, nor the notify fd * here. We do that after deserialization, since they might * have gotten serialized across the reexec. */ m->taint_usr = dir_is_empty("/usr") > 0; *_m = m; return 0; fail: manager_free(m); return r; } static int manager_setup_notify(Manager *m) { union { struct sockaddr sa; struct sockaddr_un un; } sa = { .sa.sa_family = AF_UNIX, }; int one = 1, r; if (m->notify_fd < 0) { _cleanup_close_ int fd = -1; /* First free all secondary fields */ free(m->notify_socket); m->notify_socket = NULL; m->notify_event_source = sd_event_source_unref(m->notify_event_source); fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); if (fd < 0) { log_error("Failed to allocate notification socket: %m"); return -errno; } if (getpid() != 1 || detect_container(NULL) > 0) snprintf(sa.un.sun_path, sizeof(sa.un.sun_path), NOTIFY_SOCKET "/%" PRIx64, random_u64()); else strncpy(sa.un.sun_path, NOTIFY_SOCKET, sizeof(sa.un.sun_path)); sa.un.sun_path[0] = 0; r = bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)); if (r < 0) { log_error("bind() failed: %m"); return -errno; } r = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); if (r < 0) { log_error("SO_PASSCRED failed: %m"); return -errno; } sa.un.sun_path[0] = '@'; m->notify_socket = strdup(sa.un.sun_path); if (!m->notify_socket) return log_oom(); m->notify_fd = fd; fd = -1; log_debug("Using notification socket %s", m->notify_socket); } if (!m->notify_event_source) { r = sd_event_add_io(m->event, m->notify_fd, EPOLLIN, manager_dispatch_notify_fd, m, &m->notify_event_source); if (r < 0) { log_error("Failed to allocate notify event source: %s", strerror(-r)); return -errno; } /* Process signals a bit earlier than SIGCHLD, so that we can * still identify to which service an exit message belongs */ r = sd_event_source_set_priority(m->notify_event_source, -7); if (r < 0) { log_error("Failed to set priority of notify event source: %s", strerror(-r)); return r; } } return 0; } static int manager_setup_kdbus(Manager *m) { #ifdef ENABLE_KDBUS _cleanup_free_ char *p = NULL; #endif #ifdef ENABLE_KDBUS assert(m); if (m->kdbus_fd >= 0) return 0; m->kdbus_fd = bus_kernel_create_bus(m->running_as == SYSTEMD_SYSTEM ? "system" : "user", m->running_as == SYSTEMD_SYSTEM, &p); if (m->kdbus_fd < 0) { log_debug("Failed to set up kdbus: %s", strerror(-m->kdbus_fd)); return m->kdbus_fd; } log_debug("Successfully set up kdbus on %s", p); /* Create the namespace directory here, so that the contents * of that directory is not visible to non-root users. This is * necessary to ensure that users cannot get access to busses * of virtualized users when no UID namespacing is used. */ if (m->running_as == SYSTEMD_SYSTEM) mkdir_p_label("/dev/kdbus/domain", 0700); #endif return 0; } static int manager_connect_bus(Manager *m, bool reexecuting) { bool try_bus_connect; assert(m); try_bus_connect = m->kdbus_fd >= 0 || reexecuting || (m->running_as == SYSTEMD_USER && getenv("DBUS_SESSION_BUS_ADDRESS")); /* Try to connect to the busses, if possible. */ return bus_init(m, try_bus_connect); } static unsigned manager_dispatch_cleanup_queue(Manager *m) { Unit *u; unsigned n = 0; assert(m); while ((u = m->cleanup_queue)) { assert(u->in_cleanup_queue); unit_free(u); n++; } return n; } enum { GC_OFFSET_IN_PATH, /* This one is on the path we were traveling */ GC_OFFSET_UNSURE, /* No clue */ GC_OFFSET_GOOD, /* We still need this unit */ GC_OFFSET_BAD, /* We don't need this unit anymore */ _GC_OFFSET_MAX }; static void unit_gc_sweep(Unit *u, unsigned gc_marker) { Iterator i; Unit *other; bool is_bad; assert(u); if (u->gc_marker == gc_marker + GC_OFFSET_GOOD || u->gc_marker == gc_marker + GC_OFFSET_BAD || u->gc_marker == gc_marker + GC_OFFSET_IN_PATH) return; if (u->in_cleanup_queue) goto bad; if (unit_check_gc(u)) goto good; u->gc_marker = gc_marker + GC_OFFSET_IN_PATH; is_bad = true; SET_FOREACH(other, u->dependencies[UNIT_REFERENCED_BY], i) { unit_gc_sweep(other, gc_marker); if (other->gc_marker == gc_marker + GC_OFFSET_GOOD) goto good; if (other->gc_marker != gc_marker + GC_OFFSET_BAD) is_bad = false; } if (is_bad) goto bad; /* We were unable to find anything out about this entry, so * let's investigate it later */ u->gc_marker = gc_marker + GC_OFFSET_UNSURE; unit_add_to_gc_queue(u); return; bad: /* We definitely know that this one is not useful anymore, so * let's mark it for deletion */ u->gc_marker = gc_marker + GC_OFFSET_BAD; unit_add_to_cleanup_queue(u); return; good: u->gc_marker = gc_marker + GC_OFFSET_GOOD; } static unsigned manager_dispatch_gc_queue(Manager *m) { Unit *u; unsigned n = 0; unsigned gc_marker; assert(m); /* log_debug("Running GC..."); */ m->gc_marker += _GC_OFFSET_MAX; if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX) m->gc_marker = 1; gc_marker = m->gc_marker; while ((u = m->gc_queue)) { assert(u->in_gc_queue); unit_gc_sweep(u, gc_marker); LIST_REMOVE(gc_queue, m->gc_queue, u); u->in_gc_queue = false; n++; if (u->gc_marker == gc_marker + GC_OFFSET_BAD || u->gc_marker == gc_marker + GC_OFFSET_UNSURE) { log_debug_unit(u->id, "Collecting %s", u->id); u->gc_marker = gc_marker + GC_OFFSET_BAD; unit_add_to_cleanup_queue(u); } } m->n_in_gc_queue = 0; return n; } static void manager_clear_jobs_and_units(Manager *m) { Unit *u; assert(m); while ((u = hashmap_first(m->units))) unit_free(u); manager_dispatch_cleanup_queue(m); assert(!m->load_queue); assert(!m->run_queue); assert(!m->dbus_unit_queue); assert(!m->dbus_job_queue); assert(!m->cleanup_queue); assert(!m->gc_queue); assert(hashmap_isempty(m->jobs)); assert(hashmap_isempty(m->units)); m->n_on_console = 0; m->n_running_jobs = 0; } void manager_free(Manager *m) { UnitType c; int i; assert(m); manager_clear_jobs_and_units(m); for (c = 0; c < _UNIT_TYPE_MAX; c++) if (unit_vtable[c]->shutdown) unit_vtable[c]->shutdown(m); /* If we reexecute ourselves, we keep the root cgroup * around */ manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE); manager_undo_generators(m); bus_done(m); hashmap_free(m->units); hashmap_free(m->jobs); hashmap_free(m->watch_pids); hashmap_free(m->watch_bus); sd_event_source_unref(m->signal_event_source); sd_event_source_unref(m->notify_event_source); sd_event_source_unref(m->time_change_event_source); sd_event_source_unref(m->jobs_in_progress_event_source); sd_event_source_unref(m->idle_pipe_event_source); sd_event_source_unref(m->run_queue_event_source); if (m->signal_fd >= 0) close_nointr_nofail(m->signal_fd); if (m->notify_fd >= 0) close_nointr_nofail(m->notify_fd); if (m->time_change_fd >= 0) close_nointr_nofail(m->time_change_fd); if (m->kdbus_fd >= 0) close_nointr_nofail(m->kdbus_fd); manager_close_idle_pipe(m); udev_unref(m->udev); sd_event_unref(m->event); free(m->notify_socket); lookup_paths_free(&m->lookup_paths); strv_free(m->environment); hashmap_free(m->cgroup_unit); set_free_free(m->unit_path_cache); free(m->switch_root); free(m->switch_root_init); for (i = 0; i < RLIMIT_NLIMITS; i++) free(m->rlimit[i]); assert(hashmap_isempty(m->units_requiring_mounts_for)); hashmap_free(m->units_requiring_mounts_for); free(m); } int manager_enumerate(Manager *m) { int r = 0, q; UnitType c; assert(m); /* Let's ask every type to load all units from disk/kernel * that it might know */ for (c = 0; c < _UNIT_TYPE_MAX; c++) if (unit_vtable[c]->enumerate) { q = unit_vtable[c]->enumerate(m); if (q < 0) r = q; } manager_dispatch_load_queue(m); return r; } static int manager_coldplug(Manager *m) { int r = 0, q; Iterator i; Unit *u; char *k; assert(m); /* Then, let's set up their initial state. */ HASHMAP_FOREACH_KEY(u, k, m->units, i) { /* ignore aliases */ if (u->id != k) continue; if ((q = unit_coldplug(u)) < 0) r = q; } return r; } static void manager_build_unit_path_cache(Manager *m) { char **i; _cleanup_free_ DIR *d = NULL; int r; assert(m); set_free_free(m->unit_path_cache); m->unit_path_cache = set_new(string_hash_func, string_compare_func); if (!m->unit_path_cache) { log_error("Failed to allocate unit path cache."); return; } /* This simply builds a list of files we know exist, so that * we don't always have to go to disk */ STRV_FOREACH(i, m->lookup_paths.unit_path) { struct dirent *de; d = opendir(*i); if (!d) { if (errno != ENOENT) log_error("Failed to open directory %s: %m", *i); continue; } while ((de = readdir(d))) { char *p; if (ignore_file(de->d_name)) continue; p = strjoin(streq(*i, "/") ? "" : *i, "/", de->d_name, NULL); if (!p) { r = -ENOMEM; goto fail; } r = set_consume(m->unit_path_cache, p); if (r < 0) goto fail; } closedir(d); d = NULL; } return; fail: log_error("Failed to build unit path cache: %s", strerror(-r)); set_free_free(m->unit_path_cache); m->unit_path_cache = NULL; } static int manager_distribute_fds(Manager *m, FDSet *fds) { Unit *u; Iterator i; int r; assert(m); HASHMAP_FOREACH(u, m->units, i) { if (fdset_size(fds) <= 0) break; if (UNIT_VTABLE(u)->distribute_fds) { r = UNIT_VTABLE(u)->distribute_fds(u, fds); if (r < 0) return r; } } return 0; } int manager_startup(Manager *m, FILE *serialization, FDSet *fds) { int r, q; assert(m); dual_timestamp_get(&m->generators_start_timestamp); manager_run_generators(m); dual_timestamp_get(&m->generators_finish_timestamp); r = lookup_paths_init( &m->lookup_paths, m->running_as, true, m->generator_unit_path, m->generator_unit_path_early, m->generator_unit_path_late); if (r < 0) return r; manager_build_unit_path_cache(m); /* If we will deserialize make sure that during enumeration * this is already known, so we increase the counter here * already */ if (serialization) m->n_reloading ++; /* First, enumerate what we can from all config files */ dual_timestamp_get(&m->units_load_start_timestamp); r = manager_enumerate(m); dual_timestamp_get(&m->units_load_finish_timestamp); /* Second, deserialize if there is something to deserialize */ if (serialization) { q = manager_deserialize(m, serialization, fds); if (q < 0) r = q; } /* Any fds left? Find some unit which wants them. This is * useful to allow container managers to pass some file * descriptors to us pre-initialized. This enables * socket-based activation of entire containers. */ if (fdset_size(fds) > 0) { q = manager_distribute_fds(m, fds); if (q < 0) r = q; } /* We might have deserialized the notify fd, but if we didn't * then let's create the bus now */ manager_setup_notify(m); /* We might have deserialized the kdbus control fd, but if we * didn't, then let's create the bus now. */ manager_setup_kdbus(m); manager_connect_bus(m, !!serialization); /* Third, fire things up! */ q = manager_coldplug(m); if (q < 0) r = q; if (serialization) { assert(m->n_reloading > 0); m->n_reloading --; /* Let's wait for the UnitNew/JobNew messages being * sent, before we notify that the reload is * finished */ m->send_reloading_done = true; } return r; } int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, bool override, sd_bus_error *e, Job **_ret) { int r; Transaction *tr; assert(m); assert(type < _JOB_TYPE_MAX); assert(unit); assert(mode < _JOB_MODE_MAX); if (mode == JOB_ISOLATE && type != JOB_START) { sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Isolate is only valid for start."); return -EINVAL; } if (mode == JOB_ISOLATE && !unit->allow_isolate) { sd_bus_error_setf(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated."); return -EPERM; } log_debug_unit(unit->id, "Trying to enqueue job %s/%s/%s", unit->id, job_type_to_string(type), job_mode_to_string(mode)); job_type_collapse(&type, unit); tr = transaction_new(mode == JOB_REPLACE_IRREVERSIBLY); if (!tr) return -ENOMEM; r = transaction_add_job_and_dependencies(tr, type, unit, NULL, true, override, false, mode == JOB_IGNORE_DEPENDENCIES || mode == JOB_IGNORE_REQUIREMENTS, mode == JOB_IGNORE_DEPENDENCIES, e); if (r < 0) goto tr_abort; if (mode == JOB_ISOLATE) { r = transaction_add_isolate_jobs(tr, m); if (r < 0) goto tr_abort; } r = transaction_activate(tr, m, mode, e); if (r < 0) goto tr_abort; log_debug_unit(unit->id, "Enqueued job %s/%s as %u", unit->id, job_type_to_string(type), (unsigned) tr->anchor_job->id); if (_ret) *_ret = tr->anchor_job; transaction_free(tr); return 0; tr_abort: transaction_abort(tr); transaction_free(tr); return r; } int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, bool override, sd_bus_error *e, Job **_ret) { Unit *unit; int r; assert(m); assert(type < _JOB_TYPE_MAX); assert(name); assert(mode < _JOB_MODE_MAX); r = manager_load_unit(m, name, NULL, NULL, &unit); if (r < 0) return r; return manager_add_job(m, type, unit, mode, override, e, _ret); } Job *manager_get_job(Manager *m, uint32_t id) { assert(m); return hashmap_get(m->jobs, UINT32_TO_PTR(id)); } Unit *manager_get_unit(Manager *m, const char *name) { assert(m); assert(name); return hashmap_get(m->units, name); } unsigned manager_dispatch_load_queue(Manager *m) { Unit *u; unsigned n = 0; assert(m); /* Make sure we are not run recursively */ if (m->dispatching_load_queue) return 0; m->dispatching_load_queue = true; /* Dispatches the load queue. Takes a unit from the queue and * tries to load its data until the queue is empty */ while ((u = m->load_queue)) { assert(u->in_load_queue); unit_load(u); n++; } m->dispatching_load_queue = false; return n; } int manager_load_unit_prepare( Manager *m, const char *name, const char *path, sd_bus_error *e, Unit **_ret) { Unit *ret; UnitType t; int r; assert(m); assert(name || path); /* This will prepare the unit for loading, but not actually * load anything from disk. */ if (path && !is_path(path)) return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Path %s is not absolute.", path); if (!name) name = basename(path); t = unit_name_to_type(name); if (t == _UNIT_TYPE_INVALID || !unit_name_is_valid(name, TEMPLATE_INVALID)) return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is not valid.", name); ret = manager_get_unit(m, name); if (ret) { *_ret = ret; return 1; } ret = unit_new(m, unit_vtable[t]->object_size); if (!ret) return -ENOMEM; if (path) { ret->fragment_path = strdup(path); if (!ret->fragment_path) { unit_free(ret); return -ENOMEM; } } r = unit_add_name(ret, name); if (r < 0) { unit_free(ret); return r; } unit_add_to_load_queue(ret); unit_add_to_dbus_queue(ret); unit_add_to_gc_queue(ret); if (_ret) *_ret = ret; return 0; } int manager_load_unit( Manager *m, const char *name, const char *path, sd_bus_error *e, Unit **_ret) { int r; assert(m); /* This will load the service information files, but not actually * start any services or anything. */ r = manager_load_unit_prepare(m, name, path, e, _ret); if (r != 0) return r; manager_dispatch_load_queue(m); if (_ret) *_ret = unit_follow_merge(*_ret); return 0; } void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) { Iterator i; Job *j; assert(s); assert(f); HASHMAP_FOREACH(j, s->jobs, i) job_dump(j, f, prefix); } void manager_dump_units(Manager *s, FILE *f, const char *prefix) { Iterator i; Unit *u; const char *t; assert(s); assert(f); HASHMAP_FOREACH_KEY(u, t, s->units, i) if (u->id == t) unit_dump(u, f, prefix); } void manager_clear_jobs(Manager *m) { Job *j; assert(m); while ((j = hashmap_first(m->jobs))) /* No need to recurse. We're cancelling all jobs. */ job_finish_and_invalidate(j, JOB_CANCELED, false); } static int manager_dispatch_run_queue(sd_event_source *source, void *userdata) { Manager *m = userdata; Job *j; assert(source); assert(m); while ((j = m->run_queue)) { assert(j->installed); assert(j->in_run_queue); job_run_and_invalidate(j); } if (m->n_running_jobs > 0) manager_watch_jobs_in_progress(m); if (m->n_on_console > 0) manager_watch_idle_pipe(m); return 1; } static unsigned manager_dispatch_dbus_queue(Manager *m) { Job *j; Unit *u; unsigned n = 0; assert(m); if (m->dispatching_dbus_queue) return 0; m->dispatching_dbus_queue = true; while ((u = m->dbus_unit_queue)) { assert(u->in_dbus_queue); bus_unit_send_change_signal(u); n++; } while ((j = m->dbus_job_queue)) { assert(j->in_dbus_queue); bus_job_send_change_signal(j); n++; } m->dispatching_dbus_queue = false; if (m->send_reloading_done) { m->send_reloading_done = false; bus_manager_send_reloading(m, false); } if (m->queued_message) bus_send_queued_message(m); return n; } static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) { Manager *m = userdata; ssize_t n; assert(m); assert(m->notify_fd == fd); if (revents != EPOLLIN) { log_warning("Got unexpected poll event for notify fd."); return 0; } for (;;) { char buf[4096]; struct iovec iovec = { .iov_base = buf, .iov_len = sizeof(buf)-1, }; union { struct cmsghdr cmsghdr; uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; } control = {}; struct msghdr msghdr = { .msg_iov = &iovec, .msg_iovlen = 1, .msg_control = &control, .msg_controllen = sizeof(control), }; struct ucred *ucred; Unit *u; _cleanup_strv_free_ char **tags = NULL; n = recvmsg(m->notify_fd, &msghdr, MSG_DONTWAIT); if (n <= 0) { if (n == 0) return -EIO; if (errno == EAGAIN || errno == EINTR) break; return -errno; } if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) || control.cmsghdr.cmsg_level != SOL_SOCKET || control.cmsghdr.cmsg_type != SCM_CREDENTIALS || control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) { log_warning("Received notify message without credentials. Ignoring."); continue; } ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr); u = hashmap_get(m->watch_pids, LONG_TO_PTR(ucred->pid)); if (!u) { u = manager_get_unit_by_pid(m, ucred->pid); if (!u) { log_warning("Cannot find unit for notify message of PID "PID_FMT".", ucred->pid); continue; } } assert((size_t) n < sizeof(buf)); buf[n] = 0; tags = strv_split(buf, "\n\r"); if (!tags) return log_oom(); log_debug_unit(u->id, "Got notification message for unit %s", u->id); if (UNIT_VTABLE(u)->notify_message) UNIT_VTABLE(u)->notify_message(u, ucred->pid, tags); } return 0; } static int manager_dispatch_sigchld(Manager *m) { assert(m); for (;;) { siginfo_t si = {}; Unit *u; /* First we call waitd() for a PID and do not reap the * zombie. That way we can still access /proc/$PID for * it while it is a zombie. */ if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) { if (errno == ECHILD) break; if (errno == EINTR) continue; return -errno; } if (si.si_pid <= 0) break; if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) { _cleanup_free_ char *name = NULL; get_process_comm(si.si_pid, &name); log_debug("Got SIGCHLD for process "PID_FMT" (%s)", si.si_pid, strna(name)); } /* And now figure out the unit this belongs to */ u = hashmap_get(m->watch_pids, LONG_TO_PTR(si.si_pid)); if (!u) u = manager_get_unit_by_pid(m, si.si_pid); /* And now, we actually reap the zombie. */ if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) { if (errno == EINTR) continue; return -errno; } if (si.si_code != CLD_EXITED && si.si_code != CLD_KILLED && si.si_code != CLD_DUMPED) continue; log_debug("Child %lu died (code=%s, status=%i/%s)", (long unsigned) si.si_pid, sigchld_code_to_string(si.si_code), si.si_status, strna(si.si_code == CLD_EXITED ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL) : signal_to_string(si.si_status))); if (!u) continue; log_debug_unit(u->id, "Child %lu belongs to %s", (long unsigned) si.si_pid, u->id); hashmap_remove(m->watch_pids, LONG_TO_PTR(si.si_pid)); UNIT_VTABLE(u)->sigchld_event(u, si.si_pid, si.si_code, si.si_status); } return 0; } static int manager_start_target(Manager *m, const char *name, JobMode mode) { _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; int r; log_debug_unit(name, "Activating special unit %s", name); r = manager_add_job_by_name(m, JOB_START, name, mode, true, &error, NULL); if (r < 0) log_error_unit(name, "Failed to enqueue %s job: %s", name, bus_error_message(&error, r)); return r; } static int manager_dispatch_signal_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) { Manager *m = userdata; ssize_t n; struct signalfd_siginfo sfsi; bool sigchld = false; assert(m); assert(m->signal_fd == fd); if (revents != EPOLLIN) { log_warning("Got unexpected events from signal file descriptor."); return 0; } for (;;) { n = read(m->signal_fd, &sfsi, sizeof(sfsi)); if (n != sizeof(sfsi)) { if (n >= 0) return -EIO; if (errno == EINTR || errno == EAGAIN) break; return -errno; } if (sfsi.ssi_pid > 0) { _cleanup_free_ char *p = NULL; get_process_comm(sfsi.ssi_pid, &p); log_full(sfsi.ssi_signo == SIGCHLD || (sfsi.ssi_signo == SIGTERM && m->running_as == SYSTEMD_USER) ? LOG_DEBUG : LOG_INFO, "Received SIG%s from PID "PID_FMT" (%s).", signal_to_string(sfsi.ssi_signo), sfsi.ssi_pid, strna(p)); } else log_full(sfsi.ssi_signo == SIGCHLD || (sfsi.ssi_signo == SIGTERM && m->running_as == SYSTEMD_USER) ? LOG_DEBUG : LOG_INFO, "Received SIG%s.", signal_to_string(sfsi.ssi_signo)); switch (sfsi.ssi_signo) { case SIGCHLD: sigchld = true; break; case SIGTERM: if (m->running_as == SYSTEMD_SYSTEM) { /* This is for compatibility with the * original sysvinit */ m->exit_code = MANAGER_REEXECUTE; break; } /* Fall through */ case SIGINT: if (m->running_as == SYSTEMD_SYSTEM) { manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE_IRREVERSIBLY); break; } /* Run the exit target if there is one, if not, just exit. */ if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) { m->exit_code = MANAGER_EXIT; return 0; } break; case SIGWINCH: if (m->running_as == SYSTEMD_SYSTEM) manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE); /* This is a nop on non-init */ break; case SIGPWR: if (m->running_as == SYSTEMD_SYSTEM) manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE); /* This is a nop on non-init */ break; case SIGUSR1: { Unit *u; u = manager_get_unit(m, SPECIAL_DBUS_SERVICE); if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) { log_info("Trying to reconnect to bus..."); bus_init(m, true); } if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) { log_info("Loading D-Bus service..."); manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE); } break; } case SIGUSR2: { _cleanup_free_ char *dump = NULL; _cleanup_fclose_ FILE *f = NULL; size_t size; f = open_memstream(&dump, &size); if (!f) { log_warning("Failed to allocate memory stream."); break; } manager_dump_units(m, f, "\t"); manager_dump_jobs(m, f, "\t"); if (ferror(f)) { log_warning("Failed to write status stream"); break; } log_dump(LOG_INFO, dump); break; } case SIGHUP: m->exit_code = MANAGER_RELOAD; break; default: { /* Starting SIGRTMIN+0 */ static const char * const target_table[] = { [0] = SPECIAL_DEFAULT_TARGET, [1] = SPECIAL_RESCUE_TARGET, [2] = SPECIAL_EMERGENCY_TARGET, [3] = SPECIAL_HALT_TARGET, [4] = SPECIAL_POWEROFF_TARGET, [5] = SPECIAL_REBOOT_TARGET, [6] = SPECIAL_KEXEC_TARGET }; /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */ static const ManagerExitCode code_table[] = { [0] = MANAGER_HALT, [1] = MANAGER_POWEROFF, [2] = MANAGER_REBOOT, [3] = MANAGER_KEXEC }; if ((int) sfsi.ssi_signo >= SIGRTMIN+0 && (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) { int idx = (int) sfsi.ssi_signo - SIGRTMIN; manager_start_target(m, target_table[idx], (idx == 1 || idx == 2) ? JOB_ISOLATE : JOB_REPLACE); break; } if ((int) sfsi.ssi_signo >= SIGRTMIN+13 && (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) { m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13]; break; } switch (sfsi.ssi_signo - SIGRTMIN) { case 20: log_debug("Enabling showing of status."); manager_set_show_status(m, SHOW_STATUS_YES); break; case 21: log_debug("Disabling showing of status."); manager_set_show_status(m, SHOW_STATUS_NO); break; case 22: log_set_max_level(LOG_DEBUG); log_notice("Setting log level to debug."); break; case 23: log_set_max_level(LOG_INFO); log_notice("Setting log level to info."); break; case 24: if (m->running_as == SYSTEMD_USER) { m->exit_code = MANAGER_EXIT; return 0; } /* This is a nop on init */ break; case 26: log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); log_notice("Setting log target to journal-or-kmsg."); break; case 27: log_set_target(LOG_TARGET_CONSOLE); log_notice("Setting log target to console."); break; case 28: log_set_target(LOG_TARGET_KMSG); log_notice("Setting log target to kmsg."); break; case 29: log_set_target(LOG_TARGET_SYSLOG_OR_KMSG); log_notice("Setting log target to syslog-or-kmsg."); break; default: log_warning("Got unhandled signal <%s>.", signal_to_string(sfsi.ssi_signo)); } } } } if (sigchld) manager_dispatch_sigchld(m); return 0; } static int manager_dispatch_time_change_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) { Manager *m = userdata; Iterator i; Unit *u; assert(m); assert(m->time_change_fd == fd); log_struct(LOG_INFO, MESSAGE_ID(SD_MESSAGE_TIME_CHANGE), "MESSAGE=Time has been changed", NULL); /* Restart the watch */ m->time_change_event_source = sd_event_source_unref(m->time_change_event_source); close_nointr_nofail(m->time_change_fd); m->time_change_fd = -1; manager_setup_time_change(m); HASHMAP_FOREACH(u, m->units, i) if (UNIT_VTABLE(u)->time_change) UNIT_VTABLE(u)->time_change(u); return 0; } static int manager_dispatch_idle_pipe_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) { Manager *m = userdata; assert(m); assert(m->idle_pipe[2] == fd); m->no_console_output = m->n_on_console > 0; m->idle_pipe_event_source = sd_event_source_unref(m->idle_pipe_event_source); manager_close_idle_pipe(m); return 0; } static int manager_dispatch_jobs_in_progress(sd_event_source *source, usec_t usec, void *userdata) { Manager *m = userdata; int r; uint64_t next; assert(m); assert(source); manager_print_jobs_in_progress(m); next = now(CLOCK_MONOTONIC) + JOBS_IN_PROGRESS_PERIOD_USEC; log_debug("requeuing for "USEC_FMT, next); r = sd_event_source_set_time(source, next); if (r < 0) return r; return sd_event_source_set_enabled(source, SD_EVENT_ONESHOT); } int manager_loop(Manager *m) { int r; RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 50000); assert(m); m->exit_code = MANAGER_RUNNING; /* Release the path cache */ set_free_free(m->unit_path_cache); m->unit_path_cache = NULL; manager_check_finished(m); /* There might still be some zombies hanging around from * before we were exec()'ed. Let's reap them. */ r = manager_dispatch_sigchld(m); if (r < 0) return r; while (m->exit_code == MANAGER_RUNNING) { usec_t wait_usec; if (m->runtime_watchdog > 0 && m->running_as == SYSTEMD_SYSTEM) watchdog_ping(); if (!ratelimit_test(&rl)) { /* Yay, something is going seriously wrong, pause a little */ log_warning("Looping too fast. Throttling execution a little."); sleep(1); continue; } if (manager_dispatch_load_queue(m) > 0) continue; if (manager_dispatch_gc_queue(m) > 0) continue; if (manager_dispatch_cleanup_queue(m) > 0) continue; if (manager_dispatch_cgroup_queue(m) > 0) continue; if (manager_dispatch_dbus_queue(m) > 0) continue; /* Sleep for half the watchdog time */ if (m->runtime_watchdog > 0 && m->running_as == SYSTEMD_SYSTEM) { wait_usec = m->runtime_watchdog / 2; if (wait_usec <= 0) wait_usec = 1; } else wait_usec = (usec_t) -1; r = sd_event_run(m->event, wait_usec); if (r < 0) { log_error("Failed to run event loop: %s", strerror(-r)); return r; } } return m->exit_code; } int manager_load_unit_from_dbus_path(Manager *m, const char *s, sd_bus_error *e, Unit **_u) { _cleanup_free_ char *n = NULL; Unit *u; int r; assert(m); assert(s); assert(_u); r = unit_name_from_dbus_path(s, &n); if (r < 0) return r; r = manager_load_unit(m, n, NULL, e, &u); if (r < 0) return r; *_u = u; return 0; } int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) { const char *p; unsigned id; Job *j; int r; assert(m); assert(s); assert(_j); p = startswith(s, "/org/freedesktop/systemd1/job/"); if (!p) return -EINVAL; r = safe_atou(p, &id); if (r < 0) return r; j = manager_get_job(m, id); if (!j) return -ENOENT; *_j = j; return 0; } void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) { #ifdef HAVE_AUDIT char *p; int audit_fd; audit_fd = get_audit_fd(); if (audit_fd < 0) return; /* Don't generate audit events if the service was already * started and we're just deserializing */ if (m->n_reloading > 0) return; if (m->running_as != SYSTEMD_SYSTEM) return; if (u->type != UNIT_SERVICE) return; p = unit_name_to_prefix_and_instance(u->id); if (!p) { log_error_unit(u->id, "Failed to allocate unit name for audit message: %s", strerror(ENOMEM)); return; } if (audit_log_user_comm_message(audit_fd, type, "", p, NULL, NULL, NULL, success) < 0) { if (errno == EPERM) { /* We aren't allowed to send audit messages? * Then let's not retry again. */ close_audit_fd(); } else log_warning("Failed to send audit message: %m"); } free(p); #endif } void manager_send_unit_plymouth(Manager *m, Unit *u) { int fd = -1; union sockaddr_union sa; int n = 0; char *message = NULL; /* Don't generate plymouth events if the service was already * started and we're just deserializing */ if (m->n_reloading > 0) return; if (m->running_as != SYSTEMD_SYSTEM) return; if (detect_container(NULL) > 0) return; if (u->type != UNIT_SERVICE && u->type != UNIT_MOUNT && u->type != UNIT_SWAP) return; /* We set SOCK_NONBLOCK here so that we rather drop the * message then wait for plymouth */ fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); if (fd < 0) { log_error("socket() failed: %m"); return; } zero(sa); sa.sa.sa_family = AF_UNIX; strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1); if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) { if (errno != EPIPE && errno != EAGAIN && errno != ENOENT && errno != ECONNREFUSED && errno != ECONNRESET && errno != ECONNABORTED) log_error("connect() failed: %m"); goto finish; } if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->id) + 1), u->id, &n) < 0) { log_oom(); goto finish; } errno = 0; if (write(fd, message, n + 1) != n + 1) { if (errno != EPIPE && errno != EAGAIN && errno != ENOENT && errno != ECONNREFUSED && errno != ECONNRESET && errno != ECONNABORTED) log_error("Failed to write Plymouth message: %m"); goto finish; } finish: if (fd >= 0) close_nointr_nofail(fd); free(message); } void manager_dispatch_bus_name_owner_changed( Manager *m, const char *name, const char* old_owner, const char *new_owner) { Unit *u; assert(m); assert(name); u = hashmap_get(m->watch_bus, name); if (!u) return; UNIT_VTABLE(u)->bus_name_owner_change(u, name, old_owner, new_owner); } int manager_open_serialization(Manager *m, FILE **_f) { const char *path; int fd = -1; FILE *f; assert(_f); path = m->running_as == SYSTEMD_SYSTEM ? "/run/systemd" : "/tmp"; fd = open_tmpfile(path, O_RDWR|O_CLOEXEC); if (fd < 0) return -errno; log_debug("Serializing state to %s", path); f = fdopen(fd, "w+"); if (!f) { close_nointr_nofail(fd); return -errno; } *_f = f; return 0; } int manager_serialize(Manager *m, FILE *f, FDSet *fds, bool switching_root) { Iterator i; Unit *u; const char *t; char **e; int r; assert(m); assert(f); assert(fds); m->n_reloading ++; fprintf(f, "current-job-id=%i\n", m->current_job_id); fprintf(f, "taint-usr=%s\n", yes_no(m->taint_usr)); fprintf(f, "n-installed-jobs=%u\n", m->n_installed_jobs); fprintf(f, "n-failed-jobs=%u\n", m->n_failed_jobs); dual_timestamp_serialize(f, "firmware-timestamp", &m->firmware_timestamp); dual_timestamp_serialize(f, "loader-timestamp", &m->loader_timestamp); dual_timestamp_serialize(f, "kernel-timestamp", &m->kernel_timestamp); dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp); if (!in_initrd()) { dual_timestamp_serialize(f, "userspace-timestamp", &m->userspace_timestamp); dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp); dual_timestamp_serialize(f, "security-start-timestamp", &m->security_start_timestamp); dual_timestamp_serialize(f, "security-finish-timestamp", &m->security_finish_timestamp); dual_timestamp_serialize(f, "generators-start-timestamp", &m->generators_start_timestamp); dual_timestamp_serialize(f, "generators-finish-timestamp", &m->generators_finish_timestamp); dual_timestamp_serialize(f, "units-load-start-timestamp", &m->units_load_start_timestamp); dual_timestamp_serialize(f, "units-load-finish-timestamp", &m->units_load_finish_timestamp); } if (!switching_root) { STRV_FOREACH(e, m->environment) { _cleanup_free_ char *ce; ce = cescape(*e); if (!ce) return -ENOMEM; fprintf(f, "env=%s\n", *e); } } if (m->notify_fd >= 0) { int copy; copy = fdset_put_dup(fds, m->notify_fd); if (copy < 0) return copy; fprintf(f, "notify-fd=%i\n", copy); fprintf(f, "notify-socket=%s\n", m->notify_socket); } if (m->kdbus_fd >= 0) { int copy; copy = fdset_put_dup(fds, m->kdbus_fd); if (copy < 0) return copy; fprintf(f, "kdbus-fd=%i\n", copy); } bus_serialize(m, f); fputc('\n', f); HASHMAP_FOREACH_KEY(u, t, m->units, i) { if (u->id != t) continue; if (!unit_can_serialize(u)) continue; /* Start marker */ fputs(u->id, f); fputc('\n', f); r = unit_serialize(u, f, fds, !switching_root); if (r < 0) { m->n_reloading --; return r; } } assert(m->n_reloading > 0); m->n_reloading --; if (ferror(f)) return -EIO; r = bus_fdset_add_all(m, fds); if (r < 0) return r; return 0; } int manager_deserialize(Manager *m, FILE *f, FDSet *fds) { int r = 0; assert(m); assert(f); log_debug("Deserializing state..."); m->n_reloading ++; for (;;) { char line[LINE_MAX], *l; if (!fgets(line, sizeof(line), f)) { if (feof(f)) r = 0; else r = -errno; goto finish; } char_array_0(line); l = strstrip(line); if (l[0] == 0) break; if (startswith(l, "current-job-id=")) { uint32_t id; if (safe_atou32(l+15, &id) < 0) log_debug("Failed to parse current job id value %s", l+15); else m->current_job_id = MAX(m->current_job_id, id); } else if (startswith(l, "n-installed-jobs=")) { uint32_t n; if (safe_atou32(l+17, &n) < 0) log_debug("Failed to parse installed jobs counter %s", l+17); else m->n_installed_jobs += n; } else if (startswith(l, "n-failed-jobs=")) { uint32_t n; if (safe_atou32(l+14, &n) < 0) log_debug("Failed to parse failed jobs counter %s", l+14); else m->n_failed_jobs += n; } else if (startswith(l, "taint-usr=")) { int b; b = parse_boolean(l+10); if (b < 0) log_debug("Failed to parse taint /usr flag %s", l+10); else m->taint_usr = m->taint_usr || b; } else if (startswith(l, "firmware-timestamp=")) dual_timestamp_deserialize(l+19, &m->firmware_timestamp); else if (startswith(l, "loader-timestamp=")) dual_timestamp_deserialize(l+17, &m->loader_timestamp); else if (startswith(l, "kernel-timestamp=")) dual_timestamp_deserialize(l+17, &m->kernel_timestamp); else if (startswith(l, "initrd-timestamp=")) dual_timestamp_deserialize(l+17, &m->initrd_timestamp); else if (startswith(l, "userspace-timestamp=")) dual_timestamp_deserialize(l+20, &m->userspace_timestamp); else if (startswith(l, "finish-timestamp=")) dual_timestamp_deserialize(l+17, &m->finish_timestamp); else if (startswith(l, "security-start-timestamp=")) dual_timestamp_deserialize(l+25, &m->security_start_timestamp); else if (startswith(l, "security-finish-timestamp=")) dual_timestamp_deserialize(l+26, &m->security_finish_timestamp); else if (startswith(l, "generators-start-timestamp=")) dual_timestamp_deserialize(l+27, &m->generators_start_timestamp); else if (startswith(l, "generators-finish-timestamp=")) dual_timestamp_deserialize(l+28, &m->generators_finish_timestamp); else if (startswith(l, "units-load-start-timestamp=")) dual_timestamp_deserialize(l+27, &m->units_load_start_timestamp); else if (startswith(l, "units-load-finish-timestamp=")) dual_timestamp_deserialize(l+28, &m->units_load_finish_timestamp); else if (startswith(l, "env=")) { _cleanup_free_ char *uce = NULL; char **e; uce = cunescape(l+4); if (!uce) { r = -ENOMEM; goto finish; } e = strv_env_set(m->environment, uce); if (!e) { r = -ENOMEM; goto finish; } strv_free(m->environment); m->environment = e; } else if (startswith(l, "notify-fd=")) { int fd; if (safe_atoi(l + 10, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_debug("Failed to parse notify fd: %s", l + 10); else { if (m->notify_fd >= 0) { m->notify_event_source = sd_event_source_unref(m->notify_event_source); close_nointr_nofail(m->notify_fd); } m->notify_fd = fdset_remove(fds, fd); } } else if (startswith(l, "notify-socket=")) { char *n; n = strdup(l+14); if (!n) { r = -ENOMEM; goto finish; } free(m->notify_socket); m->notify_socket = n; } else if (startswith(l, "kdbus-fd=")) { int fd; if (safe_atoi(l + 9, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_debug("Failed to parse kdbus fd: %s", l + 9); else { if (m->kdbus_fd >= 0) close_nointr_nofail(m->kdbus_fd); m->kdbus_fd = fdset_remove(fds, fd); } } else if (bus_deserialize_item(m, l) == 0) log_debug("Unknown serialization item '%s'", l); } for (;;) { Unit *u; char name[UNIT_NAME_MAX+2]; /* Start marker */ if (!fgets(name, sizeof(name), f)) { if (feof(f)) r = 0; else r = -errno; goto finish; } char_array_0(name); r = manager_load_unit(m, strstrip(name), NULL, NULL, &u); if (r < 0) goto finish; r = unit_deserialize(u, f, fds); if (r < 0) goto finish; } finish: if (ferror(f)) r = -EIO; assert(m->n_reloading > 0); m->n_reloading --; return r; } int manager_reload(Manager *m) { int r, q; _cleanup_fclose_ FILE *f = NULL; _cleanup_fdset_free_ FDSet *fds = NULL; assert(m); r = manager_open_serialization(m, &f); if (r < 0) return r; m->n_reloading ++; bus_manager_send_reloading(m, true); fds = fdset_new(); if (!fds) { m->n_reloading --; return -ENOMEM; } r = manager_serialize(m, f, fds, false); if (r < 0) { m->n_reloading --; return r; } if (fseeko(f, 0, SEEK_SET) < 0) { m->n_reloading --; return -errno; } /* From here on there is no way back. */ manager_clear_jobs_and_units(m); manager_undo_generators(m); lookup_paths_free(&m->lookup_paths); /* Find new unit paths */ manager_run_generators(m); q = lookup_paths_init( &m->lookup_paths, m->running_as, true, m->generator_unit_path, m->generator_unit_path_early, m->generator_unit_path_late); if (q < 0) r = q; manager_build_unit_path_cache(m); /* First, enumerate what we can from all config files */ q = manager_enumerate(m); if (q < 0) r = q; /* Second, deserialize our stored data */ q = manager_deserialize(m, f, fds); if (q < 0) r = q; fclose(f); f = NULL; /* Re-register notify_fd as event source */ q = manager_setup_notify(m); if (q < 0) r = q; /* Third, fire things up! */ q = manager_coldplug(m); if (q < 0) r = q; assert(m->n_reloading > 0); m->n_reloading--; m->send_reloading_done = true; return r; } static bool manager_is_booting_or_shutting_down(Manager *m) { Unit *u; assert(m); /* Is the initial job still around? */ if (manager_get_job(m, m->default_unit_job_id)) return true; /* Is there a job for the shutdown target? */ u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET); if (u) return !!u->job; return false; } bool manager_is_reloading_or_reexecuting(Manager *m) { assert(m); return m->n_reloading != 0; } void manager_reset_failed(Manager *m) { Unit *u; Iterator i; assert(m); HASHMAP_FOREACH(u, m->units, i) unit_reset_failed(u); } bool manager_unit_inactive_or_pending(Manager *m, const char *name) { Unit *u; assert(m); assert(name); /* Returns true if the unit is inactive or going down */ u = manager_get_unit(m, name); if (!u) return true; return unit_inactive_or_pending(u); } void manager_check_finished(Manager *m) { char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX]; usec_t firmware_usec, loader_usec, kernel_usec, initrd_usec, userspace_usec, total_usec; assert(m); if (m->n_running_jobs == 0) m->jobs_in_progress_event_source = sd_event_source_unref(m->jobs_in_progress_event_source); if (hashmap_size(m->jobs) > 0) { if (m->jobs_in_progress_event_source) { uint64_t next = now(CLOCK_MONOTONIC) + JOBS_IN_PROGRESS_WAIT_USEC; log_debug("requeuing for "USEC_FMT, next); sd_event_source_set_time(m->jobs_in_progress_event_source, next); } return; } manager_flip_auto_status(m, false); /* Notify Type=idle units that we are done now */ m->idle_pipe_event_source = sd_event_source_unref(m->idle_pipe_event_source); manager_close_idle_pipe(m); /* Turn off confirm spawn now */ m->confirm_spawn = false; if (dual_timestamp_is_set(&m->finish_timestamp)) return; dual_timestamp_get(&m->finish_timestamp); if (m->running_as == SYSTEMD_SYSTEM && detect_container(NULL) <= 0) { /* Note that m->kernel_usec.monotonic is always at 0, * and m->firmware_usec.monotonic and * m->loader_usec.monotonic should be considered * negative values. */ firmware_usec = m->firmware_timestamp.monotonic - m->loader_timestamp.monotonic; loader_usec = m->loader_timestamp.monotonic - m->kernel_timestamp.monotonic; userspace_usec = m->finish_timestamp.monotonic - m->userspace_timestamp.monotonic; total_usec = m->firmware_timestamp.monotonic + m->finish_timestamp.monotonic; if (dual_timestamp_is_set(&m->initrd_timestamp)) { kernel_usec = m->initrd_timestamp.monotonic - m->kernel_timestamp.monotonic; initrd_usec = m->userspace_timestamp.monotonic - m->initrd_timestamp.monotonic; if (!log_on_console()) log_struct(LOG_INFO, MESSAGE_ID(SD_MESSAGE_STARTUP_FINISHED), "KERNEL_USEC="USEC_FMT, kernel_usec, "INITRD_USEC="USEC_FMT, initrd_usec, "USERSPACE_USEC="USEC_FMT, userspace_usec, "MESSAGE=Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.", format_timespan(kernel, sizeof(kernel), kernel_usec, USEC_PER_MSEC), format_timespan(initrd, sizeof(initrd), initrd_usec, USEC_PER_MSEC), format_timespan(userspace, sizeof(userspace), userspace_usec, USEC_PER_MSEC), format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC), NULL); } else { kernel_usec = m->userspace_timestamp.monotonic - m->kernel_timestamp.monotonic; initrd_usec = 0; if (!log_on_console()) log_struct(LOG_INFO, MESSAGE_ID(SD_MESSAGE_STARTUP_FINISHED), "KERNEL_USEC="USEC_FMT, kernel_usec, "USERSPACE_USEC="USEC_FMT, userspace_usec, "MESSAGE=Startup finished in %s (kernel) + %s (userspace) = %s.", format_timespan(kernel, sizeof(kernel), kernel_usec, USEC_PER_MSEC), format_timespan(userspace, sizeof(userspace), userspace_usec, USEC_PER_MSEC), format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC), NULL); } } else { firmware_usec = loader_usec = initrd_usec = kernel_usec = 0; total_usec = userspace_usec = m->finish_timestamp.monotonic - m->userspace_timestamp.monotonic; if (!log_on_console()) log_struct(LOG_INFO, MESSAGE_ID(SD_MESSAGE_STARTUP_FINISHED), "USERSPACE_USEC="USEC_FMT, userspace_usec, "MESSAGE=Startup finished in %s.", format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC), NULL); } bus_manager_send_finished(m, firmware_usec, loader_usec, kernel_usec, initrd_usec, userspace_usec, total_usec); sd_notifyf(false, "READY=1\nSTATUS=Startup finished in %s.", format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC)); } static int create_generator_dir(Manager *m, char **generator, const char *name) { char *p; int r; assert(m); assert(generator); assert(name); if (*generator) return 0; if (m->running_as == SYSTEMD_SYSTEM && getpid() == 1) { /* systemd --system, not running --test */ p = strappend("/run/systemd/", name); if (!p) return log_oom(); r = mkdir_p_label(p, 0755); if (r < 0) { log_error("Failed to create generator directory %s: %s", p, strerror(-r)); free(p); return r; } } else if (m->running_as == SYSTEMD_USER) { const char *s = NULL; s = getenv("XDG_RUNTIME_DIR"); if (!s) return -EINVAL; p = strjoin(s, "/systemd/", name, NULL); if (!p) return log_oom(); r = mkdir_p_label(p, 0755); if (r < 0) { log_error("Failed to create generator directory %s: %s", p, strerror(-r)); free(p); return r; } } else { /* systemd --system --test */ p = strjoin("/tmp/systemd-", name, ".XXXXXX", NULL); if (!p) return log_oom(); if (!mkdtemp(p)) { log_error("Failed to create generator directory %s: %m", p); free(p); return -errno; } } *generator = p; return 0; } static void trim_generator_dir(Manager *m, char **generator) { assert(m); assert(generator); if (!*generator) return; if (rmdir(*generator) >= 0) { free(*generator); *generator = NULL; } return; } void manager_run_generators(Manager *m) { _cleanup_closedir_ DIR *d = NULL; const char *generator_path; const char *argv[5]; int r; assert(m); generator_path = m->running_as == SYSTEMD_SYSTEM ? SYSTEM_GENERATOR_PATH : USER_GENERATOR_PATH; d = opendir(generator_path); if (!d) { if (errno == ENOENT) return; log_error("Failed to enumerate generator directory %s: %m", generator_path); return; } r = create_generator_dir(m, &m->generator_unit_path, "generator"); if (r < 0) goto finish; r = create_generator_dir(m, &m->generator_unit_path_early, "generator.early"); if (r < 0) goto finish; r = create_generator_dir(m, &m->generator_unit_path_late, "generator.late"); if (r < 0) goto finish; argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */ argv[1] = m->generator_unit_path; argv[2] = m->generator_unit_path_early; argv[3] = m->generator_unit_path_late; argv[4] = NULL; RUN_WITH_UMASK(0022) execute_directory(generator_path, d, (char**) argv); finish: trim_generator_dir(m, &m->generator_unit_path); trim_generator_dir(m, &m->generator_unit_path_early); trim_generator_dir(m, &m->generator_unit_path_late); } static void remove_generator_dir(Manager *m, char **generator) { assert(m); assert(generator); if (!*generator) return; strv_remove(m->lookup_paths.unit_path, *generator); rm_rf(*generator, false, true, false); free(*generator); *generator = NULL; } void manager_undo_generators(Manager *m) { assert(m); remove_generator_dir(m, &m->generator_unit_path); remove_generator_dir(m, &m->generator_unit_path_early); remove_generator_dir(m, &m->generator_unit_path_late); } int manager_environment_add(Manager *m, char **minus, char **plus) { char **a = NULL, **b = NULL, **l; assert(m); l = m->environment; if (!strv_isempty(minus)) { a = strv_env_delete(l, 1, minus); if (!a) return -ENOMEM; l = a; } if (!strv_isempty(plus)) { b = strv_env_merge(2, l, plus); if (!b) return -ENOMEM; l = b; } if (m->environment != l) strv_free(m->environment); if (a != l) strv_free(a); if (b != l) strv_free(b); m->environment = l; manager_clean_environment(m); strv_sort(m->environment); return 0; } int manager_set_default_rlimits(Manager *m, struct rlimit **default_rlimit) { int i; assert(m); for (i = 0; i < RLIMIT_NLIMITS; i++) { if (!default_rlimit[i]) continue; m->rlimit[i] = newdup(struct rlimit, default_rlimit[i], 1); if (!m->rlimit[i]) return -ENOMEM; } return 0; } void manager_recheck_journal(Manager *m) { Unit *u; assert(m); if (m->running_as != SYSTEMD_SYSTEM) return; u = manager_get_unit(m, SPECIAL_JOURNALD_SOCKET); if (u && SOCKET(u)->state != SOCKET_RUNNING) { log_close_journal(); return; } u = manager_get_unit(m, SPECIAL_JOURNALD_SERVICE); if (u && SERVICE(u)->state != SERVICE_RUNNING) { log_close_journal(); return; } /* Hmm, OK, so the socket is fully up and the service is up * too, then let's make use of the thing. */ log_open(); } void manager_set_show_status(Manager *m, ShowStatus mode) { assert(m); assert(IN_SET(mode, SHOW_STATUS_AUTO, SHOW_STATUS_NO, SHOW_STATUS_YES, SHOW_STATUS_TEMPORARY)); if (m->running_as != SYSTEMD_SYSTEM) return; m->show_status = mode; if (mode > 0) touch("/run/systemd/show-status"); else unlink("/run/systemd/show-status"); } static bool manager_get_show_status(Manager *m) { assert(m); if (m->running_as != SYSTEMD_SYSTEM) return false; if (m->no_console_output) return false; if (m->show_status > 0) return true; /* If Plymouth is running make sure we show the status, so * that there's something nice to see when people press Esc */ return plymouth_running(); } void manager_status_printf(Manager *m, bool ephemeral, const char *status, const char *format, ...) { va_list ap; if (!manager_get_show_status(m)) return; /* XXX We should totally drop the check for ephemeral here * and thus effectively make 'Type=idle' pointless. */ if (ephemeral && m->n_on_console > 0) return; if (!manager_is_booting_or_shutting_down(m)) return; va_start(ap, format); status_vprintf(status, true, ephemeral, format, ap); va_end(ap); } int manager_get_unit_by_path(Manager *m, const char *path, const char *suffix, Unit **_found) { _cleanup_free_ char *p = NULL; Unit *found; assert(m); assert(path); assert(suffix); assert(_found); p = unit_name_from_path(path, suffix); if (!p) return -ENOMEM; found = manager_get_unit(m, p); if (!found) { *_found = NULL; return 0; } *_found = found; return 1; } Set *manager_get_units_requiring_mounts_for(Manager *m, const char *path) { char p[strlen(path)+1]; assert(m); assert(path); strcpy(p, path); path_kill_slashes(p); return hashmap_get(m->units_requiring_mounts_for, streq(p, "/") ? "" : p); }