diff options
| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 13:00:47 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 13:00:47 +0000 |
| commit | 2cb7e0aaedad73b076ea18c6900b0e86c5760d79 (patch) | |
| tree | da68ca54bb79f4080079bf0828acda937593a4e1 /src/core/manager.c | |
| parent | Initial commit. (diff) | |
| download | systemd-upstream.tar.xz systemd-upstream.zip | |
Adding upstream version 247.3.upstream/247.3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
| -rw-r--r-- | src/core/manager.c | 4975 |
1 files changed, 4975 insertions, 0 deletions
diff --git a/src/core/manager.c b/src/core/manager.c new file mode 100644 index 0000000..a1d6f7c --- /dev/null +++ b/src/core/manager.c @@ -0,0 +1,4975 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <errno.h> +#include <fcntl.h> +#include <linux/kd.h> +#include <sys/epoll.h> +#include <sys/inotify.h> +#include <sys/ioctl.h> +#include <sys/reboot.h> +#include <sys/timerfd.h> +#include <sys/wait.h> +#include <unistd.h> + +#if HAVE_AUDIT +#include <libaudit.h> +#endif + +#include "sd-daemon.h" +#include "sd-messages.h" +#include "sd-path.h" + +#include "all-units.h" +#include "alloc-util.h" +#include "audit-fd.h" +#include "boot-timestamps.h" +#include "bus-common-errors.h" +#include "bus-error.h" +#include "bus-kernel.h" +#include "bus-util.h" +#include "clean-ipc.h" +#include "clock-util.h" +#include "core-varlink.h" +#include "dbus-job.h" +#include "dbus-manager.h" +#include "dbus-unit.h" +#include "dbus.h" +#include "def.h" +#include "dirent-util.h" +#include "env-util.h" +#include "escape.h" +#include "exec-util.h" +#include "execute.h" +#include "exit-status.h" +#include "fd-util.h" +#include "fileio.h" +#include "fs-util.h" +#include "generator-setup.h" +#include "hashmap.h" +#include "install.h" +#include "io-util.h" +#include "label.h" +#include "locale-setup.h" +#include "load-fragment.h" +#include "log.h" +#include "macro.h" +#include "manager.h" +#include "memory-util.h" +#include "mkdir.h" +#include "parse-util.h" +#include "path-lookup.h" +#include "path-util.h" +#include "process-util.h" +#include "ratelimit.h" +#include "rlimit-util.h" +#include "rm-rf.h" +#include "selinux-util.h" +#include "serialize.h" +#include "signal-util.h" +#include "socket-util.h" +#include "special.h" +#include "stat-util.h" +#include "string-table.h" +#include "string-util.h" +#include "strv.h" +#include "strxcpyx.h" +#include "sysctl-util.h" +#include "syslog-util.h" +#include "terminal-util.h" +#include "time-util.h" +#include "transaction.h" +#include "umask-util.h" +#include "unit-name.h" +#include "user-util.h" +#include "virt.h" +#include "watchdog.h" + +#define NOTIFY_RCVBUF_SIZE (8*1024*1024) +#define CGROUPS_AGENT_RCVBUF_SIZE (8*1024*1024) + +/* Initial delay and the interval for printing status messages about running jobs */ +#define JOBS_IN_PROGRESS_WAIT_USEC (2*USEC_PER_SEC) +#define JOBS_IN_PROGRESS_QUIET_WAIT_USEC (25*USEC_PER_SEC) +#define JOBS_IN_PROGRESS_PERIOD_USEC (USEC_PER_SEC / 3) +#define JOBS_IN_PROGRESS_PERIOD_DIVISOR 3 + +/* If there are more than 1K bus messages queue across our API and direct buses, then let's not add more on top until + * the queue gets more empty. */ +#define MANAGER_BUS_BUSY_THRESHOLD 1024LU + +/* How many units and jobs to process of the bus queue before returning to the event loop. */ +#define MANAGER_BUS_MESSAGE_BUDGET 100U + +static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata); +static int manager_dispatch_cgroups_agent_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_user_lookup_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_dispatch_sigchld(sd_event_source *source, void *userdata); +static int manager_dispatch_timezone_change(sd_event_source *source, const struct inotify_event *event, void *userdata); +static int manager_run_environment_generators(Manager *m); +static int manager_run_generators(Manager *m); +static void manager_vacuum(Manager *m); + +static usec_t manager_watch_jobs_next_time(Manager *m) { + return usec_add(now(CLOCK_MONOTONIC), + show_status_on(m->show_status) ? JOBS_IN_PROGRESS_WAIT_USEC : + JOBS_IN_PROGRESS_QUIET_WAIT_USEC); +} + +static void manager_watch_jobs_in_progress(Manager *m) { + usec_t next; + int r; + + assert(m); + + /* We do not want to show the cylon animation if the user + * needs to confirm service executions otherwise confirmation + * messages will be screwed by the cylon animation. */ + if (!manager_is_confirm_spawn_disabled(m)) + return; + + if (m->jobs_in_progress_event_source) + return; + + next = manager_watch_jobs_next_time(m); + r = sd_event_add_time( + m->event, + &m->jobs_in_progress_event_source, + CLOCK_MONOTONIC, + next, 0, + manager_dispatch_jobs_in_progress, m); + if (r < 0) + return; + + (void) sd_event_source_set_description(m->jobs_in_progress_event_source, "manager-jobs-in-progress"); +} + +#define CYLON_BUFFER_EXTRA (2*STRLEN(ANSI_RED) + STRLEN(ANSI_HIGHLIGHT_RED) + 2*STRLEN(ANSI_NORMAL)) + +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); + if (log_get_show_color()) + p = stpcpy(p, ANSI_RED); + *p++ = '*'; + } + + if (pos > 0 && pos <= width) { + if (log_get_show_color()) + p = stpcpy(p, ANSI_HIGHLIGHT_RED); + *p++ = '*'; + } + + if (log_get_show_color()) + p = stpcpy(p, ANSI_NORMAL); + + if (pos < width) { + if (log_get_show_color()) + p = stpcpy(p, ANSI_RED); + *p++ = '*'; + if (pos < width-1) + p = mempset(p, ' ', width-1-pos); + if (log_get_show_color()) + strcpy(p, ANSI_NORMAL); + } +} + +static void manager_flip_auto_status(Manager *m, bool enable, const char *reason) { + assert(m); + + if (enable) { + if (m->show_status == SHOW_STATUS_AUTO) + manager_set_show_status(m, SHOW_STATUS_TEMPORARY, reason); + } else { + if (m->show_status == SHOW_STATUS_TEMPORARY) + manager_set_show_status(m, SHOW_STATUS_AUTO, reason); + } +} + +static void manager_print_jobs_in_progress(Manager *m) { + _cleanup_free_ char *job_of_n = NULL; + 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); + assert(m->n_running_jobs > 0); + + manager_flip_auto_status(m, true, "delay"); + + print_nr = (m->jobs_in_progress_iteration / JOBS_IN_PROGRESS_PERIOD_DIVISOR) % m->n_running_jobs; + + HASHMAP_FOREACH(j, m->jobs) + 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, STATUS_TYPE_EPHEMERAL, cylon, + "%sA %s job is running for %s (%s / %s)", + strempty(job_of_n), + job_type_to_string(j->type), + unit_status_string(j->unit), + time, limit); +} + +static int have_ask_password(void) { + _cleanup_closedir_ DIR *dir; + struct dirent *de; + + dir = opendir("/run/systemd/ask-password"); + if (!dir) { + if (errno == ENOENT) + return false; + else + return -errno; + } + + FOREACH_DIRENT_ALL(de, dir, return -errno) { + if (startswith(de->d_name, "ask.")) + return true; + } + return false; +} + +static int manager_dispatch_ask_password_fd(sd_event_source *source, + int fd, uint32_t revents, void *userdata) { + Manager *m = userdata; + + assert(m); + + (void) flush_fd(fd); + + m->have_ask_password = have_ask_password(); + if (m->have_ask_password < 0) + /* Log error but continue. Negative have_ask_password + * is treated as unknown status. */ + log_error_errno(m->have_ask_password, "Failed to list /run/systemd/ask-password: %m"); + + return 0; +} + +static void manager_close_ask_password(Manager *m) { + assert(m); + + m->ask_password_event_source = sd_event_source_unref(m->ask_password_event_source); + m->ask_password_inotify_fd = safe_close(m->ask_password_inotify_fd); + m->have_ask_password = -EINVAL; +} + +static int manager_check_ask_password(Manager *m) { + int r; + + assert(m); + + if (!m->ask_password_event_source) { + assert(m->ask_password_inotify_fd < 0); + + (void) mkdir_p_label("/run/systemd/ask-password", 0755); + + m->ask_password_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); + if (m->ask_password_inotify_fd < 0) + return log_error_errno(errno, "Failed to create inotify object: %m"); + + r = inotify_add_watch_and_warn(m->ask_password_inotify_fd, + "/run/systemd/ask-password", + IN_CREATE|IN_DELETE|IN_MOVE); + if (r < 0) { + manager_close_ask_password(m); + return r; + } + + r = sd_event_add_io(m->event, &m->ask_password_event_source, + m->ask_password_inotify_fd, EPOLLIN, + manager_dispatch_ask_password_fd, m); + if (r < 0) { + log_error_errno(r, "Failed to add event source for /run/systemd/ask-password: %m"); + manager_close_ask_password(m); + return r; + } + + (void) sd_event_source_set_description(m->ask_password_event_source, "manager-ask-password"); + + /* Queries might have been added meanwhile... */ + manager_dispatch_ask_password_fd(m->ask_password_event_source, + m->ask_password_inotify_fd, EPOLLIN, m); + } + + return m->have_ask_password; +} + +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_event_source, m->idle_pipe[2], EPOLLIN, manager_dispatch_idle_pipe_fd, m); + if (r < 0) + return log_error_errno(r, "Failed to watch idle pipe: %m"); + + (void) sd_event_source_set_description(m->idle_pipe_event_source, "manager-idle-pipe"); + + return 0; +} + +static void manager_close_idle_pipe(Manager *m) { + assert(m); + + m->idle_pipe_event_source = sd_event_source_unref(m->idle_pipe_event_source); + + safe_close_pair(m->idle_pipe); + safe_close_pair(m->idle_pipe + 2); +} + +static int manager_setup_time_change(Manager *m) { + int r; + + assert(m); + + if (MANAGER_IS_TEST_RUN(m)) + return 0; + + m->time_change_event_source = sd_event_source_unref(m->time_change_event_source); + m->time_change_fd = safe_close(m->time_change_fd); + + m->time_change_fd = time_change_fd(); + if (m->time_change_fd < 0) + return log_error_errno(m->time_change_fd, "Failed to create timer change timer fd: %m"); + + r = sd_event_add_io(m->event, &m->time_change_event_source, m->time_change_fd, EPOLLIN, manager_dispatch_time_change_fd, m); + if (r < 0) + return log_error_errno(r, "Failed to create time change event source: %m"); + + /* Schedule this slightly earlier than the .timer event sources */ + r = sd_event_source_set_priority(m->time_change_event_source, SD_EVENT_PRIORITY_NORMAL-1); + if (r < 0) + return log_error_errno(r, "Failed to set priority of time change event sources: %m"); + + (void) sd_event_source_set_description(m->time_change_event_source, "manager-time-change"); + + log_debug("Set up TFD_TIMER_CANCEL_ON_SET timerfd."); + + return 0; +} + +static int manager_read_timezone_stat(Manager *m) { + struct stat st; + bool changed; + + assert(m); + + /* Read the current stat() data of /etc/localtime so that we detect changes */ + if (lstat("/etc/localtime", &st) < 0) { + log_debug_errno(errno, "Failed to stat /etc/localtime, ignoring: %m"); + changed = m->etc_localtime_accessible; + m->etc_localtime_accessible = false; + } else { + usec_t k; + + k = timespec_load(&st.st_mtim); + changed = !m->etc_localtime_accessible || k != m->etc_localtime_mtime; + + m->etc_localtime_mtime = k; + m->etc_localtime_accessible = true; + } + + return changed; +} + +static int manager_setup_timezone_change(Manager *m) { + _cleanup_(sd_event_source_unrefp) sd_event_source *new_event = NULL; + int r; + + assert(m); + + if (MANAGER_IS_TEST_RUN(m)) + return 0; + + /* We watch /etc/localtime for three events: change of the link count (which might mean removal from /etc even + * though another link might be kept), renames, and file close operations after writing. Note we don't bother + * with IN_DELETE_SELF, as that would just report when the inode is removed entirely, i.e. after the link count + * went to zero and all fds to it are closed. + * + * Note that we never follow symlinks here. This is a simplification, but should cover almost all cases + * correctly. + * + * Note that we create the new event source first here, before releasing the old one. This should optimize + * behaviour as this way sd-event can reuse the old watch in case the inode didn't change. */ + + r = sd_event_add_inotify(m->event, &new_event, "/etc/localtime", + IN_ATTRIB|IN_MOVE_SELF|IN_CLOSE_WRITE|IN_DONT_FOLLOW, manager_dispatch_timezone_change, m); + if (r == -ENOENT) { + /* If the file doesn't exist yet, subscribe to /etc instead, and wait until it is created either by + * O_CREATE or by rename() */ + + log_debug_errno(r, "/etc/localtime doesn't exist yet, watching /etc instead."); + r = sd_event_add_inotify(m->event, &new_event, "/etc", + IN_CREATE|IN_MOVED_TO|IN_ONLYDIR, manager_dispatch_timezone_change, m); + } + if (r < 0) + return log_error_errno(r, "Failed to create timezone change event source: %m"); + + /* Schedule this slightly earlier than the .timer event sources */ + r = sd_event_source_set_priority(new_event, SD_EVENT_PRIORITY_NORMAL-1); + if (r < 0) + return log_error_errno(r, "Failed to set priority of timezone change event sources: %m"); + + sd_event_source_unref(m->timezone_change_event_source); + m->timezone_change_event_source = TAKE_PTR(new_event); + + return 0; +} + +static int enable_special_signals(Manager *m) { + _cleanup_close_ int fd = -1; + + assert(m); + + if (MANAGER_IS_TEST_RUN(m)) + return 0; + + /* 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 && !IN_SET(errno, EPERM, EINVAL)) + log_warning_errno(errno, "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_errno(errno, "Failed to open /dev/tty0: %m"); + } else { + /* Enable that we get SIGWINCH on kbrequest */ + if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0) + log_warning_errno(errno, "Failed to enable kbrequest handling: %m"); + } + + return 0; +} + +#define RTSIG_IF_AVAILABLE(signum) (signum <= SIGRTMAX ? signum : -1) + +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); + + assert_se(sigaction(SIGCHLD, &sa, NULL) == 0); + + /* We make liberal use of realtime signals here. On + * Linux/glibc we have 30 of them (with the exception of Linux + * on hppa, see below), between SIGRTMIN+0 ... SIGRTMIN+30 + * (aka SIGRTMAX). */ + + 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 */ + + /* ... space for more special targets ... */ + + SIGRTMIN+13, /* systemd: Immediate halt */ + SIGRTMIN+14, /* systemd: Immediate poweroff */ + SIGRTMIN+15, /* systemd: Immediate reboot */ + SIGRTMIN+16, /* systemd: Immediate kexec */ + + /* ... space for more immediate system state changes ... */ + + 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) */ + + /* .. one free signal here ... */ + + /* Apparently Linux on hppa had fewer RT signals until v3.18, + * SIGRTMAX was SIGRTMIN+25, and then SIGRTMIN was lowered, + * see commit v3.17-7614-g1f25df2eff. + * + * We cannot unconditionally make use of those signals here, + * so let's use a runtime check. Since these commands are + * accessible by different means and only really a safety + * net, the missing functionality on hppa shouldn't matter. + */ + + RTSIG_IF_AVAILABLE(SIGRTMIN+26), /* systemd: set log target to journal-or-kmsg */ + RTSIG_IF_AVAILABLE(SIGRTMIN+27), /* systemd: set log target to console */ + RTSIG_IF_AVAILABLE(SIGRTMIN+28), /* systemd: set log target to kmsg */ + RTSIG_IF_AVAILABLE(SIGRTMIN+29), /* systemd: set log target to syslog-or-kmsg (obsolete) */ + + /* ... one free signal here SIGRTMIN+30 ... */ + -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_event_source, m->signal_fd, EPOLLIN, manager_dispatch_signal_fd, m); + if (r < 0) + return r; + + (void) sd_event_source_set_description(m->signal_event_source, "manager-signal"); + + /* Process signals a bit earlier than the rest of things, but later than notify_fd processing, so that the + * notify processing can still figure out to which process/service a message belongs, before we reap the + * process. Also, process this before handling cgroup notifications, so that we always collect child exit + * status information before detecting that there's no process in a cgroup. */ + r = sd_event_source_set_priority(m->signal_event_source, SD_EVENT_PRIORITY_NORMAL-6); + if (r < 0) + return r; + + if (MANAGER_IS_SYSTEM(m)) + return enable_special_signals(m); + + return 0; +} + +static char** sanitize_environment(char **l) { + + /* Let's remove some environment variables that we need ourselves to communicate with our clients */ + strv_env_unset_many( + l, + "CACHE_DIRECTORY", + "CONFIGURATION_DIRECTORY", + "CREDENTIALS_DIRECTORY", + "EXIT_CODE", + "EXIT_STATUS", + "INVOCATION_ID", + "JOURNAL_STREAM", + "LISTEN_FDNAMES", + "LISTEN_FDS", + "LISTEN_PID", + "LOGS_DIRECTORY", + "MAINPID", + "MANAGERPID", + "NOTIFY_SOCKET", + "PIDFILE", + "REMOTE_ADDR", + "REMOTE_PORT", + "RUNTIME_DIRECTORY", + "SERVICE_RESULT", + "STATE_DIRECTORY", + "WATCHDOG_PID", + "WATCHDOG_USEC", + NULL); + + /* Let's order the environment alphabetically, just to make it pretty */ + strv_sort(l); + + return l; +} + +int manager_default_environment(Manager *m) { + int r; + + assert(m); + + m->transient_environment = strv_free(m->transient_environment); + + if (MANAGER_IS_SYSTEM(m)) { + /* The system manager always starts with a clean + * environment for its children. It does not import + * the kernel's or the parents' exported variables. + * + * The initial passed environment is untouched to keep + * /proc/self/environ valid; it is used for tagging + * the init process inside containers. */ + m->transient_environment = strv_new("PATH=" DEFAULT_PATH); + if (!m->transient_environment) + return log_oom(); + + /* Import locale variables LC_*= from configuration */ + (void) locale_setup(&m->transient_environment); + } else { + _cleanup_free_ char *k = NULL; + + /* The user manager passes its own environment + * along to its children, except for $PATH. */ + m->transient_environment = strv_copy(environ); + if (!m->transient_environment) + return log_oom(); + + k = strdup("PATH=" DEFAULT_USER_PATH); + if (!k) + return log_oom(); + + r = strv_env_replace(&m->transient_environment, k); + if (r < 0) + return log_oom(); + TAKE_PTR(k); + } + + sanitize_environment(m->transient_environment); + + return 0; +} + +static int manager_setup_prefix(Manager *m) { + struct table_entry { + uint64_t type; + const char *suffix; + }; + + static const struct table_entry paths_system[_EXEC_DIRECTORY_TYPE_MAX] = { + [EXEC_DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME, NULL }, + [EXEC_DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE, NULL }, + [EXEC_DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE, NULL }, + [EXEC_DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS, NULL }, + [EXEC_DIRECTORY_CONFIGURATION] = { SD_PATH_SYSTEM_CONFIGURATION, NULL }, + }; + + static const struct table_entry paths_user[_EXEC_DIRECTORY_TYPE_MAX] = { + [EXEC_DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME, NULL }, + [EXEC_DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION, NULL }, + [EXEC_DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE, NULL }, + [EXEC_DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" }, + [EXEC_DIRECTORY_CONFIGURATION] = { SD_PATH_USER_CONFIGURATION, NULL }, + }; + + assert(m); + + const struct table_entry *p = MANAGER_IS_SYSTEM(m) ? paths_system : paths_user; + int r; + + for (ExecDirectoryType i = 0; i < _EXEC_DIRECTORY_TYPE_MAX; i++) { + r = sd_path_lookup(p[i].type, p[i].suffix, &m->prefix[i]); + if (r < 0) + return r; + } + + return 0; +} + +static void manager_free_unit_name_maps(Manager *m) { + m->unit_id_map = hashmap_free(m->unit_id_map); + m->unit_name_map = hashmap_free(m->unit_name_map); + m->unit_path_cache = set_free(m->unit_path_cache); + m->unit_cache_timestamp_hash = 0; +} + +static int manager_setup_run_queue(Manager *m) { + int r; + + assert(m); + assert(!m->run_queue_event_source); + + r = sd_event_add_defer(m->event, &m->run_queue_event_source, manager_dispatch_run_queue, m); + if (r < 0) + return r; + + r = sd_event_source_set_priority(m->run_queue_event_source, SD_EVENT_PRIORITY_IDLE); + if (r < 0) + return r; + + r = sd_event_source_set_enabled(m->run_queue_event_source, SD_EVENT_OFF); + if (r < 0) + return r; + + (void) sd_event_source_set_description(m->run_queue_event_source, "manager-run-queue"); + + return 0; +} + +static int manager_setup_sigchld_event_source(Manager *m) { + int r; + + assert(m); + assert(!m->sigchld_event_source); + + r = sd_event_add_defer(m->event, &m->sigchld_event_source, manager_dispatch_sigchld, m); + if (r < 0) + return r; + + r = sd_event_source_set_priority(m->sigchld_event_source, SD_EVENT_PRIORITY_NORMAL-7); + if (r < 0) + return r; + + r = sd_event_source_set_enabled(m->sigchld_event_source, SD_EVENT_OFF); + if (r < 0) + return r; + + (void) sd_event_source_set_description(m->sigchld_event_source, "manager-sigchld"); + + return 0; +} + +int manager_new(UnitFileScope scope, ManagerTestRunFlags test_run_flags, Manager **_m) { + _cleanup_(manager_freep) Manager *m = NULL; + const char *e; + int r; + + assert(_m); + assert(IN_SET(scope, UNIT_FILE_SYSTEM, UNIT_FILE_USER)); + + m = new(Manager, 1); + if (!m) + return -ENOMEM; + + *m = (Manager) { + .unit_file_scope = scope, + .objective = _MANAGER_OBJECTIVE_INVALID, + + .status_unit_format = STATUS_UNIT_FORMAT_DEFAULT, + + .default_timer_accuracy_usec = USEC_PER_MINUTE, + .default_memory_accounting = MEMORY_ACCOUNTING_DEFAULT, + .default_tasks_accounting = true, + .default_tasks_max = TASKS_MAX_UNSET, + .default_timeout_start_usec = DEFAULT_TIMEOUT_USEC, + .default_timeout_stop_usec = DEFAULT_TIMEOUT_USEC, + .default_restart_usec = DEFAULT_RESTART_USEC, + + .original_log_level = -1, + .original_log_target = _LOG_TARGET_INVALID, + + .watchdog_overridden[WATCHDOG_RUNTIME] = USEC_INFINITY, + .watchdog_overridden[WATCHDOG_REBOOT] = USEC_INFINITY, + .watchdog_overridden[WATCHDOG_KEXEC] = USEC_INFINITY, + + .show_status_overridden = _SHOW_STATUS_INVALID, + + .notify_fd = -1, + .cgroups_agent_fd = -1, + .signal_fd = -1, + .time_change_fd = -1, + .user_lookup_fds = { -1, -1 }, + .private_listen_fd = -1, + .dev_autofs_fd = -1, + .cgroup_inotify_fd = -1, + .pin_cgroupfs_fd = -1, + .ask_password_inotify_fd = -1, + .idle_pipe = { -1, -1, -1, -1}, + + /* start as id #1, so that we can leave #0 around as "null-like" value */ + .current_job_id = 1, + + .have_ask_password = -EINVAL, /* we don't know */ + .first_boot = -1, + .test_run_flags = test_run_flags, + + .default_oom_policy = OOM_STOP, + }; + +#if ENABLE_EFI + if (MANAGER_IS_SYSTEM(m) && detect_container() <= 0) + boot_timestamps(m->timestamps + MANAGER_TIMESTAMP_USERSPACE, + m->timestamps + MANAGER_TIMESTAMP_FIRMWARE, + m->timestamps + MANAGER_TIMESTAMP_LOADER); +#endif + + /* Prepare log fields we can use for structured logging */ + if (MANAGER_IS_SYSTEM(m)) { + m->unit_log_field = "UNIT="; + m->unit_log_format_string = "UNIT=%s"; + + m->invocation_log_field = "INVOCATION_ID="; + m->invocation_log_format_string = "INVOCATION_ID=%s"; + } else { + m->unit_log_field = "USER_UNIT="; + m->unit_log_format_string = "USER_UNIT=%s"; + + m->invocation_log_field = "USER_INVOCATION_ID="; + m->invocation_log_format_string = "USER_INVOCATION_ID=%s"; + } + + /* Reboot immediately if the user hits C-A-D more often than 7x per 2s */ + m->ctrl_alt_del_ratelimit = (RateLimit) { .interval = 2 * USEC_PER_SEC, .burst = 7 }; + + r = manager_default_environment(m); + if (r < 0) + return r; + + r = hashmap_ensure_allocated(&m->units, &string_hash_ops); + if (r < 0) + return r; + + r = hashmap_ensure_allocated(&m->cgroup_unit, &path_hash_ops); + if (r < 0) + return r; + + r = hashmap_ensure_allocated(&m->watch_bus, &string_hash_ops); + if (r < 0) + return r; + + r = prioq_ensure_allocated(&m->run_queue, compare_job_priority); + if (r < 0) + return r; + + r = manager_setup_prefix(m); + if (r < 0) + return r; + + e = secure_getenv("CREDENTIALS_DIRECTORY"); + if (e) { + m->received_credentials = strdup(e); + if (!m->received_credentials) + return -ENOMEM; + } + + r = sd_event_default(&m->event); + if (r < 0) + return r; + + r = manager_setup_run_queue(m); + if (r < 0) + return r; + + if (test_run_flags == MANAGER_TEST_RUN_MINIMAL) { + m->cgroup_root = strdup(""); + if (!m->cgroup_root) + return -ENOMEM; + } else { + r = manager_setup_signals(m); + if (r < 0) + return r; + + r = manager_setup_cgroup(m); + if (r < 0) + return r; + + r = manager_setup_time_change(m); + if (r < 0) + return r; + + r = manager_read_timezone_stat(m); + if (r < 0) + return r; + + (void) manager_setup_timezone_change(m); + + r = manager_setup_sigchld_event_source(m); + if (r < 0) + return r; + } + + if (test_run_flags == 0) { + if (MANAGER_IS_SYSTEM(m)) + r = mkdir_label("/run/systemd/units", 0755); + else { + _cleanup_free_ char *units_path = NULL; + r = xdg_user_runtime_dir(&units_path, "/systemd/units"); + if (r < 0) + return r; + r = mkdir_p_label(units_path, 0755); + } + + if (r < 0 && r != -EEXIST) + return r; + } + + m->taint_usr = + !in_initrd() && + dir_is_empty("/usr") > 0; + + /* Note that we do not set up the notify fd here. We do that after deserialization, + * since they might have gotten serialized across the reexec. */ + + *_m = TAKE_PTR(m); + + return 0; +} + +static int manager_setup_notify(Manager *m) { + int r; + + if (MANAGER_IS_TEST_RUN(m)) + return 0; + + if (m->notify_fd < 0) { + _cleanup_close_ int fd = -1; + union sockaddr_union sa; + socklen_t sa_len; + + /* First free all secondary fields */ + m->notify_socket = mfree(m->notify_socket); + 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) + return log_error_errno(errno, "Failed to allocate notification socket: %m"); + + fd_inc_rcvbuf(fd, NOTIFY_RCVBUF_SIZE); + + m->notify_socket = path_join(m->prefix[EXEC_DIRECTORY_RUNTIME], "systemd/notify"); + if (!m->notify_socket) + return log_oom(); + + r = sockaddr_un_set_path(&sa.un, m->notify_socket); + if (r < 0) + return log_error_errno(r, "Notify socket '%s' not valid for AF_UNIX socket address, refusing.", + m->notify_socket); + sa_len = r; + + (void) mkdir_parents_label(m->notify_socket, 0755); + (void) sockaddr_un_unlink(&sa.un); + + r = mac_selinux_bind(fd, &sa.sa, sa_len); + if (r < 0) + return log_error_errno(r, "bind(%s) failed: %m", m->notify_socket); + + r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true); + if (r < 0) + return log_error_errno(r, "SO_PASSCRED failed: %m"); + + m->notify_fd = TAKE_FD(fd); + + log_debug("Using notification socket %s", m->notify_socket); + } + + if (!m->notify_event_source) { + r = sd_event_add_io(m->event, &m->notify_event_source, m->notify_fd, EPOLLIN, manager_dispatch_notify_fd, m); + if (r < 0) + return log_error_errno(r, "Failed to allocate notify event source: %m"); + + /* Process notification messages 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, SD_EVENT_PRIORITY_NORMAL-8); + if (r < 0) + return log_error_errno(r, "Failed to set priority of notify event source: %m"); + + (void) sd_event_source_set_description(m->notify_event_source, "manager-notify"); + } + + return 0; +} + +static int manager_setup_cgroups_agent(Manager *m) { + + static const union sockaddr_union sa = { + .un.sun_family = AF_UNIX, + .un.sun_path = "/run/systemd/cgroups-agent", + }; + int r; + + /* This creates a listening socket we receive cgroups agent messages on. We do not use D-Bus for delivering + * these messages from the cgroups agent binary to PID 1, as the cgroups agent binary is very short-living, and + * each instance of it needs a new D-Bus connection. Since D-Bus connections are SOCK_STREAM/AF_UNIX, on + * overloaded systems the backlog of the D-Bus socket becomes relevant, as not more than the configured number + * of D-Bus connections may be queued until the kernel will start dropping further incoming connections, + * possibly resulting in lost cgroups agent messages. To avoid this, we'll use a private SOCK_DGRAM/AF_UNIX + * socket, where no backlog is relevant as communication may take place without an actual connect() cycle, and + * we thus won't lose messages. + * + * Note that PID 1 will forward the agent message to system bus, so that the user systemd instance may listen + * to it. The system instance hence listens on this special socket, but the user instances listen on the system + * bus for these messages. */ + + if (MANAGER_IS_TEST_RUN(m)) + return 0; + + if (!MANAGER_IS_SYSTEM(m)) + return 0; + + r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER); + if (r < 0) + return log_error_errno(r, "Failed to determine whether unified cgroups hierarchy is used: %m"); + if (r > 0) /* We don't need this anymore on the unified hierarchy */ + return 0; + + if (m->cgroups_agent_fd < 0) { + _cleanup_close_ int fd = -1; + + /* First free all secondary fields */ + m->cgroups_agent_event_source = sd_event_source_unref(m->cgroups_agent_event_source); + + fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); + if (fd < 0) + return log_error_errno(errno, "Failed to allocate cgroups agent socket: %m"); + + fd_inc_rcvbuf(fd, CGROUPS_AGENT_RCVBUF_SIZE); + + (void) sockaddr_un_unlink(&sa.un); + + /* Only allow root to connect to this socket */ + RUN_WITH_UMASK(0077) + r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)); + if (r < 0) + return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path); + + m->cgroups_agent_fd = TAKE_FD(fd); + } + + if (!m->cgroups_agent_event_source) { + r = sd_event_add_io(m->event, &m->cgroups_agent_event_source, m->cgroups_agent_fd, EPOLLIN, manager_dispatch_cgroups_agent_fd, m); + if (r < 0) + return log_error_errno(r, "Failed to allocate cgroups agent event source: %m"); + + /* Process cgroups notifications early. Note that when the agent notification is received + * we'll just enqueue the unit in the cgroup empty queue, hence pick a high priority than + * that. Also see handling of cgroup inotify for the unified cgroup stuff. */ + r = sd_event_source_set_priority(m->cgroups_agent_event_source, SD_EVENT_PRIORITY_NORMAL-9); + if (r < 0) + return log_error_errno(r, "Failed to set priority of cgroups agent event source: %m"); + + (void) sd_event_source_set_description(m->cgroups_agent_event_source, "manager-cgroups-agent"); + } + + return 0; +} + +static int manager_setup_user_lookup_fd(Manager *m) { + int r; + + assert(m); + + /* Set up the socket pair used for passing UID/GID resolution results from forked off processes to PID + * 1. Background: we can't do name lookups (NSS) from PID 1, since it might involve IPC and thus activation, + * and we might hence deadlock on ourselves. Hence we do all user/group lookups asynchronously from the forked + * off processes right before executing the binaries to start. In order to be able to clean up any IPC objects + * created by a unit (see RemoveIPC=) we need to know in PID 1 the used UID/GID of the executed processes, + * hence we establish this communication channel so that forked off processes can pass their UID/GID + * information back to PID 1. The forked off processes send their resolved UID/GID to PID 1 in a simple + * datagram, along with their unit name, so that we can share one communication socket pair among all units for + * this purpose. + * + * You might wonder why we need a communication channel for this that is independent of the usual notification + * socket scheme (i.e. $NOTIFY_SOCKET). The primary difference is about trust: data sent via the $NOTIFY_SOCKET + * channel is only accepted if it originates from the right unit and if reception was enabled for it. The user + * lookup socket OTOH is only accessible by PID 1 and its children until they exec(), and always available. + * + * Note that this function is called under two circumstances: when we first initialize (in which case we + * allocate both the socket pair and the event source to listen on it), and when we deserialize after a reload + * (in which case the socket pair already exists but we still need to allocate the event source for it). */ + + if (m->user_lookup_fds[0] < 0) { + + /* Free all secondary fields */ + safe_close_pair(m->user_lookup_fds); + m->user_lookup_event_source = sd_event_source_unref(m->user_lookup_event_source); + + if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, m->user_lookup_fds) < 0) + return log_error_errno(errno, "Failed to allocate user lookup socket: %m"); + + (void) fd_inc_rcvbuf(m->user_lookup_fds[0], NOTIFY_RCVBUF_SIZE); + } + + if (!m->user_lookup_event_source) { + r = sd_event_add_io(m->event, &m->user_lookup_event_source, m->user_lookup_fds[0], EPOLLIN, manager_dispatch_user_lookup_fd, m); + if (r < 0) + return log_error_errno(errno, "Failed to allocate user lookup event source: %m"); + + /* Process even earlier than the notify event source, so that we always know first about valid UID/GID + * resolutions */ + r = sd_event_source_set_priority(m->user_lookup_event_source, SD_EVENT_PRIORITY_NORMAL-11); + if (r < 0) + return log_error_errno(errno, "Failed to set priority of user lookup event source: %m"); + + (void) sd_event_source_set_description(m->user_lookup_event_source, "user-lookup"); + } + + return 0; +} + +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_mark_good(Unit *u, unsigned gc_marker) { + Unit *other; + void *v; + + u->gc_marker = gc_marker + GC_OFFSET_GOOD; + + /* Recursively mark referenced units as GOOD as well */ + HASHMAP_FOREACH_KEY(v, other, u->dependencies[UNIT_REFERENCES]) + if (other->gc_marker == gc_marker + GC_OFFSET_UNSURE) + unit_gc_mark_good(other, gc_marker); +} + +static void unit_gc_sweep(Unit *u, unsigned gc_marker) { + Unit *other; + bool is_bad; + void *v; + + assert(u); + + if (IN_SET(u->gc_marker - gc_marker, + GC_OFFSET_GOOD, GC_OFFSET_BAD, GC_OFFSET_UNSURE, GC_OFFSET_IN_PATH)) + return; + + if (u->in_cleanup_queue) + goto bad; + + if (!unit_may_gc(u)) + goto good; + + u->gc_marker = gc_marker + GC_OFFSET_IN_PATH; + + is_bad = true; + + HASHMAP_FOREACH_KEY(v, other, u->dependencies[UNIT_REFERENCED_BY]) { + 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 (u->refs_by_target) { + const UnitRef *ref; + + LIST_FOREACH(refs_by_target, ref, u->refs_by_target) { + unit_gc_sweep(ref->source, gc_marker); + + if (ref->source->gc_marker == gc_marker + GC_OFFSET_GOOD) + goto good; + + if (ref->source->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: + unit_gc_mark_good(u, gc_marker); +} + +static unsigned manager_dispatch_gc_unit_queue(Manager *m) { + unsigned n = 0, gc_marker; + Unit *u; + + 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_unit_queue)) { + assert(u->in_gc_queue); + + unit_gc_sweep(u, gc_marker); + + LIST_REMOVE(gc_queue, m->gc_unit_queue, u); + u->in_gc_queue = false; + + n++; + + if (IN_SET(u->gc_marker - gc_marker, + GC_OFFSET_BAD, GC_OFFSET_UNSURE)) { + if (u->id) + log_unit_debug(u, "Collecting."); + u->gc_marker = gc_marker + GC_OFFSET_BAD; + unit_add_to_cleanup_queue(u); + } + } + + return n; +} + +static unsigned manager_dispatch_gc_job_queue(Manager *m) { + unsigned n = 0; + Job *j; + + assert(m); + + while ((j = m->gc_job_queue)) { + assert(j->in_gc_queue); + + LIST_REMOVE(gc_queue, m->gc_job_queue, j); + j->in_gc_queue = false; + + n++; + + if (!job_may_gc(j)) + continue; + + log_unit_debug(j->unit, "Collecting job."); + (void) job_finish_and_invalidate(j, JOB_COLLECTED, false, false); + } + + return n; +} + +static unsigned manager_dispatch_stop_when_unneeded_queue(Manager *m) { + unsigned n = 0; + Unit *u; + int r; + + assert(m); + + while ((u = m->stop_when_unneeded_queue)) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + assert(m->stop_when_unneeded_queue); + + assert(u->in_stop_when_unneeded_queue); + LIST_REMOVE(stop_when_unneeded_queue, m->stop_when_unneeded_queue, u); + u->in_stop_when_unneeded_queue = false; + + n++; + + if (!unit_is_unneeded(u)) + continue; + + log_unit_debug(u, "Unit is not needed anymore."); + + /* If stopping a unit fails continuously we might enter a stop loop here, hence stop acting on the + * service being unnecessary after a while. */ + + if (!ratelimit_below(&u->auto_stop_ratelimit)) { + log_unit_warning(u, "Unit not needed anymore, but not stopping since we tried this too often recently."); + continue; + } + + /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */ + r = manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, NULL, &error, NULL); + if (r < 0) + log_unit_warning_errno(u, r, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error, r)); + } + + 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(prioq_isempty(m->run_queue)); + assert(!m->dbus_unit_queue); + assert(!m->dbus_job_queue); + assert(!m->cleanup_queue); + assert(!m->gc_unit_queue); + assert(!m->gc_job_queue); + assert(!m->stop_when_unneeded_queue); + + assert(hashmap_isempty(m->jobs)); + assert(hashmap_isempty(m->units)); + + m->n_on_console = 0; + m->n_running_jobs = 0; + m->n_installed_jobs = 0; + m->n_failed_jobs = 0; +} + +Manager* manager_free(Manager *m) { + if (!m) + return NULL; + + manager_clear_jobs_and_units(m); + + for (UnitType c = 0; c < _UNIT_TYPE_MAX; c++) + if (unit_vtable[c]->shutdown) + unit_vtable[c]->shutdown(m); + + /* Keep the cgroup hierarchy in place except when we know we are going down for good */ + manager_shutdown_cgroup(m, IN_SET(m->objective, MANAGER_EXIT, MANAGER_REBOOT, MANAGER_POWEROFF, MANAGER_HALT, MANAGER_KEXEC)); + + lookup_paths_flush_generator(&m->lookup_paths); + + bus_done(m); + manager_varlink_done(m); + + exec_runtime_vacuum(m); + hashmap_free(m->exec_runtime_by_id); + + dynamic_user_vacuum(m, false); + hashmap_free(m->dynamic_users); + + hashmap_free(m->units); + hashmap_free(m->units_by_invocation_id); + hashmap_free(m->jobs); + hashmap_free(m->watch_pids); + hashmap_free(m->watch_bus); + + prioq_free(m->run_queue); + + set_free(m->startup_units); + set_free(m->failed_units); + + sd_event_source_unref(m->signal_event_source); + sd_event_source_unref(m->sigchld_event_source); + sd_event_source_unref(m->notify_event_source); + sd_event_source_unref(m->cgroups_agent_event_source); + sd_event_source_unref(m->time_change_event_source); + sd_event_source_unref(m->timezone_change_event_source); + sd_event_source_unref(m->jobs_in_progress_event_source); + sd_event_source_unref(m->run_queue_event_source); + sd_event_source_unref(m->user_lookup_event_source); + + safe_close(m->signal_fd); + safe_close(m->notify_fd); + safe_close(m->cgroups_agent_fd); + safe_close(m->time_change_fd); + safe_close_pair(m->user_lookup_fds); + + manager_close_ask_password(m); + + manager_close_idle_pipe(m); + + sd_event_unref(m->event); + + free(m->notify_socket); + + lookup_paths_free(&m->lookup_paths); + strv_free(m->transient_environment); + strv_free(m->client_environment); + + hashmap_free(m->cgroup_unit); + manager_free_unit_name_maps(m); + + free(m->switch_root); + free(m->switch_root_init); + + rlimit_free_all(m->rlimit); + + assert(hashmap_isempty(m->units_requiring_mounts_for)); + hashmap_free(m->units_requiring_mounts_for); + + hashmap_free(m->uid_refs); + hashmap_free(m->gid_refs); + + for (ExecDirectoryType dt = 0; dt < _EXEC_DIRECTORY_TYPE_MAX; dt++) + m->prefix[dt] = mfree(m->prefix[dt]); + free(m->received_credentials); + + return mfree(m); +} + +static void manager_enumerate_perpetual(Manager *m) { + assert(m); + + if (m->test_run_flags == MANAGER_TEST_RUN_MINIMAL) + return; + + /* Let's ask every type to load all units from disk/kernel that it might know */ + for (UnitType c = 0; c < _UNIT_TYPE_MAX; c++) { + if (!unit_type_supported(c)) { + log_debug("Unit type .%s is not supported on this system.", unit_type_to_string(c)); + continue; + } + + if (unit_vtable[c]->enumerate_perpetual) + unit_vtable[c]->enumerate_perpetual(m); + } +} + +static void manager_enumerate(Manager *m) { + assert(m); + + if (m->test_run_flags == MANAGER_TEST_RUN_MINIMAL) + return; + + /* Let's ask every type to load all units from disk/kernel that it might know */ + for (UnitType c = 0; c < _UNIT_TYPE_MAX; c++) { + if (!unit_type_supported(c)) { + log_debug("Unit type .%s is not supported on this system.", unit_type_to_string(c)); + continue; + } + + if (unit_vtable[c]->enumerate) + unit_vtable[c]->enumerate(m); + } + + manager_dispatch_load_queue(m); +} + +static void manager_coldplug(Manager *m) { + Unit *u; + char *k; + int r; + + assert(m); + + log_debug("Invoking unit coldplug() handlers…"); + + /* Let's place the units back into their deserialized state */ + HASHMAP_FOREACH_KEY(u, k, m->units) { + + /* ignore aliases */ + if (u->id != k) + continue; + + r = unit_coldplug(u); + if (r < 0) + log_warning_errno(r, "We couldn't coldplug %s, proceeding anyway: %m", u->id); + } +} + +static void manager_catchup(Manager *m) { + Unit *u; + char *k; + + assert(m); + + log_debug("Invoking unit catchup() handlers…"); + + /* Let's catch up on any state changes that happened while we were reloading/reexecing */ + HASHMAP_FOREACH_KEY(u, k, m->units) { + + /* ignore aliases */ + if (u->id != k) + continue; + + unit_catchup(u); + } +} + +static void manager_distribute_fds(Manager *m, FDSet *fds) { + Unit *u; + + assert(m); + + HASHMAP_FOREACH(u, m->units) { + + if (fdset_size(fds) <= 0) + break; + + if (!UNIT_VTABLE(u)->distribute_fds) + continue; + + UNIT_VTABLE(u)->distribute_fds(u, fds); + } +} + +static bool manager_dbus_is_running(Manager *m, bool deserialized) { + Unit *u; + + assert(m); + + /* This checks whether the dbus instance we are supposed to expose our APIs on is up. We check both the socket + * and the service unit. If the 'deserialized' parameter is true we'll check the deserialized state of the unit + * rather than the current one. */ + + if (MANAGER_IS_TEST_RUN(m)) + return false; + + u = manager_get_unit(m, SPECIAL_DBUS_SOCKET); + if (!u) + return false; + if ((deserialized ? SOCKET(u)->deserialized_state : SOCKET(u)->state) != SOCKET_RUNNING) + return false; + + u = manager_get_unit(m, SPECIAL_DBUS_SERVICE); + if (!u) + return false; + if (!IN_SET((deserialized ? SERVICE(u)->deserialized_state : SERVICE(u)->state), SERVICE_RUNNING, SERVICE_RELOAD)) + return false; + + return true; +} + +static void manager_setup_bus(Manager *m) { + assert(m); + + /* Let's set up our private bus connection now, unconditionally */ + (void) bus_init_private(m); + + /* If we are in --user mode also connect to the system bus now */ + if (MANAGER_IS_USER(m)) + (void) bus_init_system(m); + + /* Let's connect to the bus now, but only if the unit is supposed to be up */ + if (manager_dbus_is_running(m, MANAGER_IS_RELOADING(m))) { + (void) bus_init_api(m); + + if (MANAGER_IS_SYSTEM(m)) + (void) bus_init_system(m); + } +} + +static void manager_preset_all(Manager *m) { + int r; + + assert(m); + + if (m->first_boot <= 0) + return; + + if (!MANAGER_IS_SYSTEM(m)) + return; + + if (MANAGER_IS_TEST_RUN(m)) + return; + + /* If this is the first boot, and we are in the host system, then preset everything */ + r = unit_file_preset_all(UNIT_FILE_SYSTEM, 0, NULL, UNIT_FILE_PRESET_ENABLE_ONLY, 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."); +} + +static void manager_ready(Manager *m) { + assert(m); + + /* After having loaded everything, do the final round of catching up with what might have changed */ + + m->objective = MANAGER_OK; /* Tell everyone we are up now */ + + /* It might be safe to log to the journal now and connect to dbus */ + manager_recheck_journal(m); + manager_recheck_dbus(m); + + /* Let's finally catch up with any changes that took place while we were reloading/reexecing */ + manager_catchup(m); + + m->honor_device_enumeration = true; +} + +static Manager* manager_reloading_start(Manager *m) { + m->n_reloading++; + return m; +} +static void manager_reloading_stopp(Manager **m) { + if (*m) { + assert((*m)->n_reloading > 0); + (*m)->n_reloading--; + } +} + +int manager_startup(Manager *m, FILE *serialization, FDSet *fds) { + int r; + + assert(m); + + /* If we are running in test mode, we still want to run the generators, + * but we should not touch the real generator directories. */ + r = lookup_paths_init(&m->lookup_paths, m->unit_file_scope, + MANAGER_IS_TEST_RUN(m) ? LOOKUP_PATHS_TEMPORARY_GENERATED : 0, + NULL); + if (r < 0) + return log_error_errno(r, "Failed to initialize path lookup table: %m"); + + dual_timestamp_get(m->timestamps + manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_GENERATORS_START)); + r = manager_run_environment_generators(m); + if (r >= 0) + r = manager_run_generators(m); + dual_timestamp_get(m->timestamps + manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_GENERATORS_FINISH)); + if (r < 0) + return r; + + manager_preset_all(m); + + lookup_paths_log(&m->lookup_paths); + + { + /* This block is (optionally) done with the reloading counter bumped */ + _cleanup_(manager_reloading_stopp) Manager *reloading = NULL; + + /* If we will deserialize make sure that during enumeration this is already known, so we increase the + * counter here already */ + if (serialization) + reloading = manager_reloading_start(m); + + /* First, enumerate what we can from all config files */ + dual_timestamp_get(m->timestamps + manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_UNITS_LOAD_START)); + manager_enumerate_perpetual(m); + manager_enumerate(m); + dual_timestamp_get(m->timestamps + manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_UNITS_LOAD_FINISH)); + + /* Second, deserialize if there is something to deserialize */ + if (serialization) { + r = manager_deserialize(m, serialization, fds); + if (r < 0) + return log_error_errno(r, "Deserialization failed: %m"); + } + + /* 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. */ + manager_distribute_fds(m, fds); + + /* We might have deserialized the notify fd, but if we didn't then let's create the bus now */ + r = manager_setup_notify(m); + if (r < 0) + /* No sense to continue without notifications, our children would fail anyway. */ + return r; + + r = manager_setup_cgroups_agent(m); + if (r < 0) + /* Likewise, no sense to continue without empty cgroup notifications. */ + return r; + + r = manager_setup_user_lookup_fd(m); + if (r < 0) + /* This shouldn't fail, except if things are really broken. */ + return r; + + /* Connect to the bus if we are good for it */ + manager_setup_bus(m); + + /* Now that we are connected to all possible buses, let's deserialize who is tracking us. */ + r = bus_track_coldplug(m, &m->subscribed, false, m->deserialized_subscribed); + if (r < 0) + log_warning_errno(r, "Failed to deserialized tracked clients, ignoring: %m"); + m->deserialized_subscribed = strv_free(m->deserialized_subscribed); + + r = manager_varlink_init(m); + if (r < 0) + log_warning_errno(r, "Failed to set up Varlink server, ignoring: %m"); + + /* Third, fire things up! */ + manager_coldplug(m); + + /* Clean up runtime objects */ + manager_vacuum(m); + + if (serialization) + /* Let's wait for the UnitNew/JobNew messages being sent, before we notify that the + * reload is finished */ + m->send_reloading_done = true; + } + + manager_ready(m); + + return 0; +} + +int manager_add_job( + Manager *m, + JobType type, + Unit *unit, + JobMode mode, + Set *affected_jobs, + sd_bus_error *error, + Job **ret) { + + Transaction *tr; + int r; + + assert(m); + assert(type < _JOB_TYPE_MAX); + assert(unit); + assert(mode < _JOB_MODE_MAX); + + if (mode == JOB_ISOLATE && type != JOB_START) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Isolate is only valid for start."); + + if (mode == JOB_ISOLATE && !unit->allow_isolate) + return sd_bus_error_setf(error, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated."); + + if (mode == JOB_TRIGGERING && type != JOB_STOP) + return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "--job-mode=triggering is only valid for stop."); + + log_unit_debug(unit, "Trying to enqueue job %s/%s/%s", unit->id, job_type_to_string(type), job_mode_to_string(mode)); + + type = 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, false, + IN_SET(mode, JOB_IGNORE_DEPENDENCIES, JOB_IGNORE_REQUIREMENTS), + mode == JOB_IGNORE_DEPENDENCIES, error); + if (r < 0) + goto tr_abort; + + if (mode == JOB_ISOLATE) { + r = transaction_add_isolate_jobs(tr, m); + if (r < 0) + goto tr_abort; + } + + if (mode == JOB_TRIGGERING) { + r = transaction_add_triggering_jobs(tr, unit); + if (r < 0) + goto tr_abort; + } + + r = transaction_activate(tr, m, mode, affected_jobs, error); + if (r < 0) + goto tr_abort; + + log_unit_debug(unit, + "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, Set *affected_jobs, sd_bus_error *e, Job **ret) { + Unit *unit = NULL; /* just to appease gcc, initialization is not really necessary */ + 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; + assert(unit); + + return manager_add_job(m, type, unit, mode, affected_jobs, e, ret); +} + +int manager_add_job_by_name_and_warn(Manager *m, JobType type, const char *name, JobMode mode, Set *affected_jobs, Job **ret) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + int r; + + assert(m); + assert(type < _JOB_TYPE_MAX); + assert(name); + assert(mode < _JOB_MODE_MAX); + + r = manager_add_job_by_name(m, type, name, mode, affected_jobs, &error, ret); + if (r < 0) + return log_warning_errno(r, "Failed to enqueue %s job for %s: %s", job_mode_to_string(mode), name, bus_error_message(&error, r)); + + return r; +} + +int manager_propagate_reload(Manager *m, Unit *unit, JobMode mode, sd_bus_error *e) { + int r; + Transaction *tr; + + assert(m); + assert(unit); + assert(mode < _JOB_MODE_MAX); + assert(mode != JOB_ISOLATE); /* Isolate is only valid for start */ + + tr = transaction_new(mode == JOB_REPLACE_IRREVERSIBLY); + if (!tr) + return -ENOMEM; + + /* We need an anchor job */ + r = transaction_add_job_and_dependencies(tr, JOB_NOP, unit, NULL, false, false, true, true, e); + if (r < 0) + goto tr_abort; + + /* Failure in adding individual dependencies is ignored, so this always succeeds. */ + transaction_add_propagate_reload_jobs(tr, unit, tr->anchor_job, mode == JOB_IGNORE_DEPENDENCIES, e); + + r = transaction_activate(tr, m, mode, NULL, e); + if (r < 0) + goto tr_abort; + + transaction_free(tr); + return 0; + +tr_abort: + transaction_abort(tr); + transaction_free(tr); + return r; +} + +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); +} + +static int manager_dispatch_target_deps_queue(Manager *m) { + Unit *u; + int r = 0; + + static const UnitDependency deps[] = { + UNIT_REQUIRED_BY, + UNIT_REQUISITE_OF, + UNIT_WANTED_BY, + UNIT_BOUND_BY + }; + + assert(m); + + while ((u = m->target_deps_queue)) { + assert(u->in_target_deps_queue); + + LIST_REMOVE(target_deps_queue, u->manager->target_deps_queue, u); + u->in_target_deps_queue = false; + + for (size_t k = 0; k < ELEMENTSOF(deps); k++) { + Unit *target; + void *v; + + HASHMAP_FOREACH_KEY(v, target, u->dependencies[deps[k]]) { + r = unit_add_default_target_dependency(u, target); + if (r < 0) + return r; + } + } + } + + return r; +} + +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; + + /* Dispatch the units waiting for their target dependencies to be added now, as all targets that we know about + * should be loaded and have aliases resolved */ + (void) manager_dispatch_target_deps_queue(m); + + return n; +} + +bool manager_unit_cache_should_retry_load(Unit *u) { + assert(u); + + /* Automatic reloading from disk only applies to units which were not found sometime in the past, and + * the not-found stub is kept pinned in the unit graph by dependencies. For units that were + * previously loaded, we don't do automatic reloading, and daemon-reload is necessary to update. */ + if (u->load_state != UNIT_NOT_FOUND) + return false; + + /* The cache has been updated since the last time we tried to load the unit. There might be new + * fragment paths to read. */ + if (u->manager->unit_cache_timestamp_hash != u->fragment_not_found_timestamp_hash) + return true; + + /* The cache needs to be updated because there are modifications on disk. */ + return !lookup_paths_timestamp_hash_same(&u->manager->lookup_paths, u->manager->unit_cache_timestamp_hash, NULL); +} + +int manager_load_unit_prepare( + Manager *m, + const char *name, + const char *path, + sd_bus_error *e, + Unit **_ret) { + + _cleanup_(unit_freep) Unit *cleanup_ret = NULL; + Unit *ret; + UnitType t; + int r; + + assert(m); + assert(_ret); + + /* This will prepare the unit for loading, but not actually load anything from disk. */ + + if (path && !path_is_absolute(path)) + return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Path %s is not absolute.", path); + + if (!name) { + /* 'name' and 'path' must not both be null. Check here 'path' using assert_se() to + * workaround a bug in gcc that generates a -Wnonnull warning when calling basename(), + * but this cannot be possible in any code path (See #6119). */ + assert_se(path); + name = basename(path); + } + + t = unit_name_to_type(name); + + if (t == _UNIT_TYPE_INVALID || !unit_name_is_valid(name, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) { + if (unit_name_is_valid(name, UNIT_NAME_TEMPLATE)) + return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is missing the instance name.", name); + + 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) { + /* The time-based cache allows to start new units without daemon-reload, + * but if they are already referenced (because of dependencies or ordering) + * then we have to force a load of the fragment. As an optimization, check + * first if anything in the usual paths was modified since the last time + * the cache was loaded. Also check if the last time an attempt to load the + * unit was made was before the most recent cache refresh, so that we know + * we need to try again — even if the cache is current, it might have been + * updated in a different context before we had a chance to retry loading + * this particular unit. */ + if (manager_unit_cache_should_retry_load(ret)) + ret->load_state = UNIT_STUB; + else { + *_ret = ret; + return 1; + } + } else { + ret = cleanup_ret = unit_new(m, unit_vtable[t]->object_size); + if (!ret) + return -ENOMEM; + } + + if (path) { + r = free_and_strdup(&ret->fragment_path, path); + if (r < 0) + return r; + } + + r = unit_add_name(ret, name); + if (r < 0) + return r; + + unit_add_to_load_queue(ret); + unit_add_to_dbus_queue(ret); + unit_add_to_gc_queue(ret); + + *_ret = ret; + cleanup_ret = NULL; + + return 0; +} + +int manager_load_unit( + Manager *m, + const char *name, + const char *path, + sd_bus_error *e, + Unit **_ret) { + + int r; + + assert(m); + assert(_ret); + + /* 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); + + *_ret = unit_follow_merge(*_ret); + return 0; +} + +int manager_load_startable_unit_or_warn( + Manager *m, + const char *name, + const char *path, + Unit **ret) { + + /* Load a unit, make sure it loaded fully and is not masked. */ + + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + Unit *unit; + int r; + + r = manager_load_unit(m, name, path, &error, &unit); + if (r < 0) + return log_error_errno(r, "Failed to load %s %s: %s", + name ? "unit" : "unit file", name ?: path, + bus_error_message(&error, r)); + + r = bus_unit_validate_load_state(unit, &error); + if (r < 0) + return log_error_errno(r, "%s", bus_error_message(&error, r)); + + *ret = unit; + return 0; +} + +void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) { + Job *j; + + assert(s); + assert(f); + + HASHMAP_FOREACH(j, s->jobs) + job_dump(j, f, prefix); +} + +void manager_dump_units(Manager *s, FILE *f, const char *prefix) { + Unit *u; + const char *t; + + assert(s); + assert(f); + + HASHMAP_FOREACH_KEY(u, t, s->units) + if (u->id == t) + unit_dump(u, f, prefix); +} + +void manager_dump(Manager *m, FILE *f, const char *prefix) { + assert(m); + assert(f); + + for (ManagerTimestamp q = 0; q < _MANAGER_TIMESTAMP_MAX; q++) { + const dual_timestamp *t = m->timestamps + q; + char buf[CONST_MAX(FORMAT_TIMESPAN_MAX, FORMAT_TIMESTAMP_MAX)]; + + if (dual_timestamp_is_set(t)) + fprintf(f, "%sTimestamp %s: %s\n", + strempty(prefix), + manager_timestamp_to_string(q), + timestamp_is_set(t->realtime) ? format_timestamp(buf, sizeof buf, t->realtime) : + format_timespan(buf, sizeof buf, t->monotonic, 1)); + } + + manager_dump_units(m, f, prefix); + manager_dump_jobs(m, f, prefix); +} + +int manager_get_dump_string(Manager *m, char **ret) { + _cleanup_free_ char *dump = NULL; + _cleanup_fclose_ FILE *f = NULL; + size_t size; + int r; + + assert(m); + assert(ret); + + f = open_memstream_unlocked(&dump, &size); + if (!f) + return -errno; + + manager_dump(m, f, NULL); + + r = fflush_and_check(f); + if (r < 0) + return r; + + f = safe_fclose(f); + + *ret = TAKE_PTR(dump); + + return 0; +} + +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, false); +} + +void manager_unwatch_pid(Manager *m, pid_t pid) { + assert(m); + + /* First let's drop the unit keyed as "pid". */ + (void) hashmap_remove(m->watch_pids, PID_TO_PTR(pid)); + + /* Then, let's also drop the array keyed by -pid. */ + free(hashmap_remove(m->watch_pids, PID_TO_PTR(-pid))); +} + +static int manager_dispatch_run_queue(sd_event_source *source, void *userdata) { + Manager *m = userdata; + Job *j; + + assert(source); + assert(m); + + while ((j = prioq_peek(m->run_queue))) { + assert(j->installed); + assert(j->in_run_queue); + + (void) 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) { + unsigned n = 0, budget; + Unit *u; + Job *j; + + assert(m); + + /* When we are reloading, let's not wait with generating signals, since we need to exit the manager as quickly + * as we can. There's no point in throttling generation of signals in that case. */ + if (MANAGER_IS_RELOADING(m) || m->send_reloading_done || m->pending_reload_message) + budget = (unsigned) -1; /* infinite budget in this case */ + else { + /* Anything to do at all? */ + if (!m->dbus_unit_queue && !m->dbus_job_queue) + return 0; + + /* Do we have overly many messages queued at the moment? If so, let's not enqueue more on top, let's + * sit this cycle out, and process things in a later cycle when the queues got a bit emptier. */ + if (manager_bus_n_queued_write(m) > MANAGER_BUS_BUSY_THRESHOLD) + return 0; + + /* Only process a certain number of units/jobs per event loop iteration. Even if the bus queue wasn't + * overly full before this call we shouldn't increase it in size too wildly in one step, and we + * shouldn't monopolize CPU time with generating these messages. Note the difference in counting of + * this "budget" and the "threshold" above: the "budget" is decreased only once per generated message, + * regardless how many buses/direct connections it is enqueued on, while the "threshold" is applied to + * each queued instance of bus message, i.e. if the same message is enqueued to five buses/direct + * connections it will be counted five times. This difference in counting ("references" + * vs. "instances") is primarily a result of the fact that it's easier to implement it this way, + * however it also reflects the thinking that the "threshold" should put a limit on used queue memory, + * i.e. space, while the "budget" should put a limit on time. Also note that the "threshold" is + * currently chosen much higher than the "budget". */ + budget = MANAGER_BUS_MESSAGE_BUDGET; + } + + while (budget != 0 && (u = m->dbus_unit_queue)) { + + assert(u->in_dbus_queue); + + bus_unit_send_change_signal(u); + n++; + + if (budget != (unsigned) -1) + budget--; + } + + while (budget != 0 && (j = m->dbus_job_queue)) { + assert(j->in_dbus_queue); + + bus_job_send_change_signal(j); + n++; + + if (budget != (unsigned) -1) + budget--; + } + + if (m->send_reloading_done) { + m->send_reloading_done = false; + bus_manager_send_reloading(m, false); + n++; + } + + if (m->pending_reload_message) { + bus_send_pending_reload_message(m); + n++; + } + + return n; +} + +static int manager_dispatch_cgroups_agent_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) { + Manager *m = userdata; + char buf[PATH_MAX]; + ssize_t n; + + n = recv(fd, buf, sizeof(buf), 0); + if (n < 0) + return log_error_errno(errno, "Failed to read cgroups agent message: %m"); + if (n == 0) { + log_error("Got zero-length cgroups agent message, ignoring."); + return 0; + } + if ((size_t) n >= sizeof(buf)) { + log_error("Got overly long cgroups agent message, ignoring."); + return 0; + } + + if (memchr(buf, 0, n)) { + log_error("Got cgroups agent message with embedded NUL byte, ignoring."); + return 0; + } + buf[n] = 0; + + manager_notify_cgroup_empty(m, buf); + (void) bus_forward_agent_released(m, buf); + + return 0; +} + +static bool manager_process_barrier_fd(char * const *tags, FDSet *fds) { + + /* nothing else must be sent when using BARRIER=1 */ + if (strv_contains(tags, "BARRIER=1")) { + if (strv_length(tags) == 1) { + if (fdset_size(fds) != 1) + log_warning("Got incorrect number of fds with BARRIER=1, closing them."); + } else + log_warning("Extra notification messages sent with BARRIER=1, ignoring everything."); + + /* Drop the message if BARRIER=1 was found */ + return true; + } + + return false; +} + +static void manager_invoke_notify_message( + Manager *m, + Unit *u, + const struct ucred *ucred, + char * const *tags, + FDSet *fds) { + + assert(m); + assert(u); + assert(ucred); + assert(tags); + + if (u->notifygen == m->notifygen) /* Already invoked on this same unit in this same iteration? */ + return; + u->notifygen = m->notifygen; + + if (UNIT_VTABLE(u)->notify_message) + UNIT_VTABLE(u)->notify_message(u, ucred, tags, fds); + + else if (DEBUG_LOGGING) { + _cleanup_free_ char *buf = NULL, *x = NULL, *y = NULL; + + buf = strv_join(tags, ", "); + if (buf) + x = ellipsize(buf, 20, 90); + if (x) + y = cescape(x); + + log_unit_debug(u, "Got notification message \"%s\", ignoring.", strnull(y)); + } +} + +static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) { + + _cleanup_fdset_free_ FDSet *fds = NULL; + Manager *m = userdata; + char buf[NOTIFY_BUFFER_MAX+1]; + struct iovec iovec = { + .iov_base = buf, + .iov_len = sizeof(buf)-1, + }; + CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred)) + + CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX)) control; + struct msghdr msghdr = { + .msg_iov = &iovec, + .msg_iovlen = 1, + .msg_control = &control, + .msg_controllen = sizeof(control), + }; + + struct cmsghdr *cmsg; + struct ucred *ucred = NULL; + _cleanup_free_ Unit **array_copy = NULL; + _cleanup_strv_free_ char **tags = NULL; + Unit *u1, *u2, **array; + int r, *fd_array = NULL; + size_t n_fds = 0; + bool found = false; + ssize_t n; + + assert(m); + assert(m->notify_fd == fd); + + if (revents != EPOLLIN) { + log_warning("Got unexpected poll event for notify fd."); + return 0; + } + + n = recvmsg_safe(m->notify_fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC|MSG_TRUNC); + if (IN_SET(n, -EAGAIN, -EINTR)) + return 0; /* Spurious wakeup, try again */ + if (n == -EXFULL) { + log_warning("Got message with truncated control data (too many fds sent?), ignoring."); + return 0; + } + if (n < 0) + /* If this is any other, real error, then let's stop processing this socket. This of course + * means we won't take notification messages anymore, but that's still better than busy + * looping around this: being woken up over and over again but being unable to actually read + * the message off the socket. */ + return log_error_errno(n, "Failed to receive notification message: %m"); + + CMSG_FOREACH(cmsg, &msghdr) { + if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) { + + assert(!fd_array); + fd_array = (int*) CMSG_DATA(cmsg); + n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); + + } else if (cmsg->cmsg_level == SOL_SOCKET && + cmsg->cmsg_type == SCM_CREDENTIALS && + cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) { + + assert(!ucred); + ucred = (struct ucred*) CMSG_DATA(cmsg); + } + } + + if (n_fds > 0) { + assert(fd_array); + + r = fdset_new_array(&fds, fd_array, n_fds); + if (r < 0) { + close_many(fd_array, n_fds); + log_oom(); + return 0; + } + } + + if (!ucred || !pid_is_valid(ucred->pid)) { + log_warning("Received notify message without valid credentials. Ignoring."); + return 0; + } + + if ((size_t) n >= sizeof(buf) || (msghdr.msg_flags & MSG_TRUNC)) { + log_warning("Received notify message exceeded maximum size. Ignoring."); + return 0; + } + + /* As extra safety check, let's make sure the string we get doesn't contain embedded NUL bytes. We permit one + * trailing NUL byte in the message, but don't expect it. */ + if (n > 1 && memchr(buf, 0, n-1)) { + log_warning("Received notify message with embedded NUL bytes. Ignoring."); + return 0; + } + + /* Make sure it's NUL-terminated, then parse it to obtain the tags list */ + buf[n] = 0; + tags = strv_split_newlines(buf); + if (!tags) { + log_oom(); + return 0; + } + + /* possibly a barrier fd, let's see */ + if (manager_process_barrier_fd(tags, fds)) + return 0; + + /* Increase the generation counter used for filtering out duplicate unit invocations. */ + m->notifygen++; + + /* Notify every unit that might be interested, which might be multiple. */ + u1 = manager_get_unit_by_pid_cgroup(m, ucred->pid); + u2 = hashmap_get(m->watch_pids, PID_TO_PTR(ucred->pid)); + array = hashmap_get(m->watch_pids, PID_TO_PTR(-ucred->pid)); + if (array) { + size_t k = 0; + + while (array[k]) + k++; + + array_copy = newdup(Unit*, array, k+1); + if (!array_copy) + log_oom(); + } + /* And now invoke the per-unit callbacks. Note that manager_invoke_notify_message() will handle duplicate units + * make sure we only invoke each unit's handler once. */ + if (u1) { + manager_invoke_notify_message(m, u1, ucred, tags, fds); + found = true; + } + if (u2) { + manager_invoke_notify_message(m, u2, ucred, tags, fds); + found = true; + } + if (array_copy) + for (size_t i = 0; array_copy[i]; i++) { + manager_invoke_notify_message(m, array_copy[i], ucred, tags, fds); + found = true; + } + + if (!found) + log_warning("Cannot find unit for notify message of PID "PID_FMT", ignoring.", ucred->pid); + + if (fdset_size(fds) > 0) + log_warning("Got extra auxiliary fds with notification message, closing them."); + + return 0; +} + +static void manager_invoke_sigchld_event( + Manager *m, + Unit *u, + const siginfo_t *si) { + + assert(m); + assert(u); + assert(si); + + /* Already invoked the handler of this unit in this iteration? Then don't process this again */ + if (u->sigchldgen == m->sigchldgen) + return; + u->sigchldgen = m->sigchldgen; + + log_unit_debug(u, "Child "PID_FMT" belongs to %s.", si->si_pid, u->id); + unit_unwatch_pid(u, si->si_pid); + + if (UNIT_VTABLE(u)->sigchld_event) + UNIT_VTABLE(u)->sigchld_event(u, si->si_pid, si->si_code, si->si_status); +} + +static int manager_dispatch_sigchld(sd_event_source *source, void *userdata) { + Manager *m = userdata; + siginfo_t si = {}; + int r; + + assert(source); + assert(m); + + /* First we call waitid() 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) + log_error_errno(errno, "Failed to peek for child with waitid(), ignoring: %m"); + + goto turn_off; + } + + if (si.si_pid <= 0) + goto turn_off; + + if (IN_SET(si.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED)) { + _cleanup_free_ Unit **array_copy = NULL; + _cleanup_free_ char *name = NULL; + Unit *u1, *u2, **array; + + (void) get_process_comm(si.si_pid, &name); + + log_debug("Child "PID_FMT" (%s) died (code=%s, status=%i/%s)", + si.si_pid, strna(name), + 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))); + + /* Increase the generation counter used for filtering out duplicate unit invocations */ + m->sigchldgen++; + + /* And now figure out the unit this belongs to, it might be multiple... */ + u1 = manager_get_unit_by_pid_cgroup(m, si.si_pid); + u2 = hashmap_get(m->watch_pids, PID_TO_PTR(si.si_pid)); + array = hashmap_get(m->watch_pids, PID_TO_PTR(-si.si_pid)); + if (array) { + size_t n = 0; + + /* Count how many entries the array has */ + while (array[n]) + n++; + + /* Make a copy of the array so that we don't trip up on the array changing beneath us */ + array_copy = newdup(Unit*, array, n+1); + if (!array_copy) + log_oom(); + } + + /* Finally, execute them all. Note that u1, u2 and the array might contain duplicates, but + * that's fine, manager_invoke_sigchld_event() will ensure we only invoke the handlers once for + * each iteration. */ + if (u1) { + /* We check for oom condition, in case we got SIGCHLD before the oom notification. + * We only do this for the cgroup the PID belonged to. */ + (void) unit_check_oom(u1); + + /* This only logs for now. In the future when the interface for kills/notifications + * is more stable we can extend service results table similar to how kernel oom kills + * are managed. */ + (void) unit_check_oomd_kill(u1); + + manager_invoke_sigchld_event(m, u1, &si); + } + if (u2) + manager_invoke_sigchld_event(m, u2, &si); + if (array_copy) + for (size_t i = 0; array_copy[i]; i++) + manager_invoke_sigchld_event(m, array_copy[i], &si); + } + + /* And now, we actually reap the zombie. */ + if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) { + log_error_errno(errno, "Failed to dequeue child, ignoring: %m"); + return 0; + } + + return 0; + +turn_off: + /* All children processed for now, turn off event source */ + + r = sd_event_source_set_enabled(m->sigchld_event_source, SD_EVENT_OFF); + if (r < 0) + return log_error_errno(r, "Failed to disable SIGCHLD event source: %m"); + + return 0; +} + +static void manager_start_target(Manager *m, const char *name, JobMode mode) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + int r; + + log_debug("Activating special unit %s", name); + + r = manager_add_job_by_name(m, JOB_START, name, mode, NULL, &error, NULL); + if (r < 0) + log_error("Failed to enqueue %s job: %s", name, bus_error_message(&error, r)); +} + +static void manager_handle_ctrl_alt_del(Manager *m) { + /* If the user presses C-A-D more than + * 7 times within 2s, we reboot/shutdown immediately, + * unless it was disabled in system.conf */ + + if (ratelimit_below(&m->ctrl_alt_del_ratelimit) || m->cad_burst_action == EMERGENCY_ACTION_NONE) + manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE_IRREVERSIBLY); + else + emergency_action(m, m->cad_burst_action, EMERGENCY_ACTION_WARN, NULL, -1, + "Ctrl-Alt-Del was pressed more than 7 times within 2s"); +} + +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; + int r; + + assert(m); + assert(m->signal_fd == fd); + + if (revents != EPOLLIN) { + log_warning("Got unexpected events from signal file descriptor."); + return 0; + } + + n = read(m->signal_fd, &sfsi, sizeof(sfsi)); + if (n != sizeof(sfsi)) { + if (n >= 0) { + log_warning("Truncated read from signal fd (%zu bytes), ignoring!", n); + return 0; + } + + if (IN_SET(errno, EINTR, EAGAIN)) + return 0; + + /* We return an error here, which will kill this handler, + * to avoid a busy loop on read error. */ + return log_error_errno(errno, "Reading from signal fd failed: %m"); + } + + log_received_signal(sfsi.ssi_signo == SIGCHLD || + (sfsi.ssi_signo == SIGTERM && MANAGER_IS_USER(m)) + ? LOG_DEBUG : LOG_INFO, + &sfsi); + + switch (sfsi.ssi_signo) { + + case SIGCHLD: + r = sd_event_source_set_enabled(m->sigchld_event_source, SD_EVENT_ON); + if (r < 0) + log_warning_errno(r, "Failed to enable SIGCHLD event source, ignoring: %m"); + + break; + + case SIGTERM: + if (MANAGER_IS_SYSTEM(m)) { + /* This is for compatibility with the original sysvinit */ + if (verify_run_space_and_log("Refusing to reexecute") < 0) + break; + + m->objective = MANAGER_REEXECUTE; + break; + } + + _fallthrough_; + case SIGINT: + if (MANAGER_IS_SYSTEM(m)) + manager_handle_ctrl_alt_del(m); + else + manager_start_target(m, SPECIAL_EXIT_TARGET, + JOB_REPLACE_IRREVERSIBLY); + break; + + case SIGWINCH: + /* This is a nop on non-init */ + if (MANAGER_IS_SYSTEM(m)) + manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE); + + break; + + case SIGPWR: + /* This is a nop on non-init */ + if (MANAGER_IS_SYSTEM(m)) + manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE); + + break; + + case SIGUSR1: + if (manager_dbus_is_running(m, false)) { + log_info("Trying to reconnect to bus..."); + + (void) bus_init_api(m); + + if (MANAGER_IS_SYSTEM(m)) + (void) bus_init_system(m); + } else { + log_info("Starting D-Bus service..."); + manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE); + } + + break; + + case SIGUSR2: { + _cleanup_free_ char *dump = NULL; + + r = manager_get_dump_string(m, &dump); + if (r < 0) { + log_warning_errno(errno, "Failed to acquire manager dump: %m"); + break; + } + + log_dump(LOG_INFO, dump); + break; + } + + case SIGHUP: + if (verify_run_space_and_log("Refusing to reload") < 0) + break; + + m->objective = MANAGER_RELOAD; + break; + + default: { + + /* Starting SIGRTMIN+0 */ + static const struct { + const char *target; + JobMode mode; + } target_table[] = { + [0] = { SPECIAL_DEFAULT_TARGET, JOB_ISOLATE }, + [1] = { SPECIAL_RESCUE_TARGET, JOB_ISOLATE }, + [2] = { SPECIAL_EMERGENCY_TARGET, JOB_ISOLATE }, + [3] = { SPECIAL_HALT_TARGET, JOB_REPLACE_IRREVERSIBLY }, + [4] = { SPECIAL_POWEROFF_TARGET, JOB_REPLACE_IRREVERSIBLY }, + [5] = { SPECIAL_REBOOT_TARGET, JOB_REPLACE_IRREVERSIBLY }, + [6] = { SPECIAL_KEXEC_TARGET, JOB_REPLACE_IRREVERSIBLY }, + }; + + /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */ + static const ManagerObjective objective_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].target, + target_table[idx].mode); + break; + } + + if ((int) sfsi.ssi_signo >= SIGRTMIN+13 && + (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(objective_table)) { + m->objective = objective_table[sfsi.ssi_signo - SIGRTMIN - 13]; + break; + } + + switch (sfsi.ssi_signo - SIGRTMIN) { + + case 20: + manager_override_show_status(m, SHOW_STATUS_YES, "signal"); + break; + + case 21: + manager_override_show_status(m, SHOW_STATUS_NO, "signal"); + break; + + case 22: + manager_override_log_level(m, LOG_DEBUG); + break; + + case 23: + manager_restore_original_log_level(m); + break; + + case 24: + if (MANAGER_IS_USER(m)) { + m->objective = MANAGER_EXIT; + return 0; + } + + /* This is a nop on init */ + break; + + case 26: + case 29: /* compatibility: used to be mapped to LOG_TARGET_SYSLOG_OR_KMSG */ + manager_restore_original_log_target(m); + break; + + case 27: + manager_override_log_target(m, LOG_TARGET_CONSOLE); + break; + + case 28: + manager_override_log_target(m, LOG_TARGET_KMSG); + break; + + default: + log_warning("Got unhandled signal <%s>.", signal_to_string(sfsi.ssi_signo)); + } + }} + + return 0; +} + +static int manager_dispatch_time_change_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) { + Manager *m = userdata; + Unit *u; + + assert(m); + assert(m->time_change_fd == fd); + + log_struct(LOG_DEBUG, + "MESSAGE_ID=" SD_MESSAGE_TIME_CHANGE_STR, + LOG_MESSAGE("Time has been changed")); + + /* Restart the watch */ + (void) manager_setup_time_change(m); + + HASHMAP_FOREACH(u, m->units) + if (UNIT_VTABLE(u)->time_change) + UNIT_VTABLE(u)->time_change(u); + + return 0; +} + +static int manager_dispatch_timezone_change( + sd_event_source *source, + const struct inotify_event *e, + void *userdata) { + + Manager *m = userdata; + int changed; + Unit *u; + + assert(m); + + log_debug("inotify event for /etc/localtime"); + + changed = manager_read_timezone_stat(m); + if (changed <= 0) + return changed; + + /* Something changed, restart the watch, to ensure we watch the new /etc/localtime if it changed */ + (void) manager_setup_timezone_change(m); + + /* Read the new timezone */ + tzset(); + + log_debug("Timezone has been changed (now: %s).", tzname[daylight]); + + HASHMAP_FOREACH(u, m->units) + if (UNIT_VTABLE(u)->timezone_change) + UNIT_VTABLE(u)->timezone_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); + + /* There's at least one Type=idle child that just gave up on us waiting for the boot process to complete. Let's + * now turn off any further console output if there's at least one service that needs console access, so that + * from now on our own output should not spill into that service's output anymore. After all, we support + * Type=idle only to beautify console output and it generally is set on services that want to own the console + * exclusively without our interference. */ + m->no_console_output = m->n_on_console > 0; + + /* Acknowledge the child's request, and let all all other children know too that they shouldn't wait any longer + * by closing the pipes towards them, which is what they are waiting for. */ + 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; + + assert(m); + assert(source); + + manager_print_jobs_in_progress(m); + + r = sd_event_source_set_time_relative(source, JOBS_IN_PROGRESS_PERIOD_USEC); + if (r < 0) + return r; + + return sd_event_source_set_enabled(source, SD_EVENT_ONESHOT); +} + +int manager_loop(Manager *m) { + RateLimit rl = { .interval = 1*USEC_PER_SEC, .burst = 50000 }; + int r; + + assert(m); + assert(m->objective == MANAGER_OK); /* Ensure manager_startup() has been called */ + + manager_check_finished(m); + + /* There might still be some zombies hanging around from before we were exec()'ed. Let's reap them. */ + r = sd_event_source_set_enabled(m->sigchld_event_source, SD_EVENT_ON); + if (r < 0) + return log_error_errno(r, "Failed to enable SIGCHLD event source: %m"); + + while (m->objective == MANAGER_OK) { + usec_t wait_usec, watchdog_usec; + + watchdog_usec = manager_get_watchdog(m, WATCHDOG_RUNTIME); + if (m->runtime_watchdog_running) + (void) watchdog_ping(); + else if (timestamp_is_set(watchdog_usec)) + manager_retry_runtime_watchdog(m); + + if (!ratelimit_below(&rl)) { + /* Yay, something is going seriously wrong, pause a little */ + log_warning("Looping too fast. Throttling execution a little."); + sleep(1); + } + + if (manager_dispatch_load_queue(m) > 0) + continue; + + if (manager_dispatch_gc_job_queue(m) > 0) + continue; + + if (manager_dispatch_gc_unit_queue(m) > 0) + continue; + + if (manager_dispatch_cleanup_queue(m) > 0) + continue; + + if (manager_dispatch_cgroup_realize_queue(m) > 0) + continue; + + if (manager_dispatch_stop_when_unneeded_queue(m) > 0) + continue; + + if (manager_dispatch_dbus_queue(m) > 0) + continue; + + /* Sleep for watchdog runtime wait time */ + if (timestamp_is_set(watchdog_usec)) + wait_usec = watchdog_runtime_wait(); + else + wait_usec = USEC_INFINITY; + + r = sd_event_run(m->event, wait_usec); + if (r < 0) + return log_error_errno(r, "Failed to run event loop: %m"); + } + + return m->objective; +} + +int manager_load_unit_from_dbus_path(Manager *m, const char *s, sd_bus_error *e, Unit **_u) { + _cleanup_free_ char *n = NULL; + sd_id128_t invocation_id; + Unit *u; + int r; + + assert(m); + assert(s); + assert(_u); + + r = unit_name_from_dbus_path(s, &n); + if (r < 0) + return r; + + /* Permit addressing units by invocation ID: if the passed bus path is suffixed by a 128bit ID then we use it + * as invocation ID. */ + r = sd_id128_from_string(n, &invocation_id); + if (r >= 0) { + u = hashmap_get(m->units_by_invocation_id, &invocation_id); + if (u) { + *_u = u; + return 0; + } + + return sd_bus_error_setf(e, BUS_ERROR_NO_UNIT_FOR_INVOCATION_ID, + "No unit with the specified invocation ID " SD_ID128_FORMAT_STR " known.", + SD_ID128_FORMAT_VAL(invocation_id)); + } + + /* If this didn't work, we check if this is a unit name */ + if (!unit_name_is_valid(n, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) { + _cleanup_free_ char *nn = NULL; + + nn = cescape(n); + return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, + "Unit name %s is neither a valid invocation ID nor unit name.", strnull(nn)); + } + + 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) { + +#if HAVE_AUDIT + _cleanup_free_ char *p = NULL; + const char *msg; + int audit_fd, r; + + if (!MANAGER_IS_SYSTEM(m)) + return; + + 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 (MANAGER_IS_RELOADING(m)) + return; + + if (u->type != UNIT_SERVICE) + return; + + r = unit_name_to_prefix_and_instance(u->id, &p); + if (r < 0) { + log_error_errno(r, "Failed to extract prefix and instance of unit name: %m"); + return; + } + + msg = strjoina("unit=", p); + if (audit_log_user_comm_message(audit_fd, type, msg, "systemd", 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_errno(errno, "Failed to send audit message: %m"); + } +#endif + +} + +void manager_send_unit_plymouth(Manager *m, Unit *u) { + static const union sockaddr_union sa = PLYMOUTH_SOCKET; + _cleanup_free_ char *message = NULL; + _cleanup_close_ int fd = -1; + int n = 0; + + /* Don't generate plymouth events if the service was already + * started and we're just deserializing */ + if (MANAGER_IS_RELOADING(m)) + return; + + if (!MANAGER_IS_SYSTEM(m)) + return; + + if (detect_container() > 0) + return; + + if (!IN_SET(u->type, UNIT_SERVICE, UNIT_MOUNT, 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_errno(errno, "socket() failed: %m"); + return; + } + + if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) { + if (!IN_SET(errno, EAGAIN, ENOENT) && !ERRNO_IS_DISCONNECT(errno)) + log_error_errno(errno, "connect() failed: %m"); + return; + } + + if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->id) + 1), u->id, &n) < 0) { + log_oom(); + return; + } + + errno = 0; + if (write(fd, message, n + 1) != n + 1) + if (!IN_SET(errno, EAGAIN, ENOENT) && !ERRNO_IS_DISCONNECT(errno)) + log_error_errno(errno, "Failed to write Plymouth message: %m"); +} + +int manager_open_serialization(Manager *m, FILE **_f) { + _cleanup_close_ int fd = -1; + FILE *f; + + assert(_f); + + fd = open_serialization_fd("systemd-state"); + if (fd < 0) + return fd; + + f = take_fdopen(&fd, "w+"); + if (!f) + return -errno; + + *_f = f; + return 0; +} + +static bool manager_timestamp_shall_serialize(ManagerTimestamp t) { + + if (!in_initrd()) + return true; + + /* The following timestamps only apply to the host system, hence only serialize them there */ + return !IN_SET(t, + MANAGER_TIMESTAMP_USERSPACE, MANAGER_TIMESTAMP_FINISH, + MANAGER_TIMESTAMP_SECURITY_START, MANAGER_TIMESTAMP_SECURITY_FINISH, + MANAGER_TIMESTAMP_GENERATORS_START, MANAGER_TIMESTAMP_GENERATORS_FINISH, + MANAGER_TIMESTAMP_UNITS_LOAD_START, MANAGER_TIMESTAMP_UNITS_LOAD_FINISH); +} + +#define DESTROY_IPC_FLAG (UINT32_C(1) << 31) + +static void manager_serialize_uid_refs_internal( + Manager *m, + FILE *f, + Hashmap **uid_refs, + const char *field_name) { + + void *p, *k; + + assert(m); + assert(f); + assert(uid_refs); + assert(field_name); + + /* Serialize the UID reference table. Or actually, just the IPC destruction flag of it, as + * the actual counter of it is better rebuild after a reload/reexec. */ + + HASHMAP_FOREACH_KEY(p, k, *uid_refs) { + uint32_t c; + uid_t uid; + + uid = PTR_TO_UID(k); + c = PTR_TO_UINT32(p); + + if (!(c & DESTROY_IPC_FLAG)) + continue; + + (void) serialize_item_format(f, field_name, UID_FMT, uid); + } +} + +static void manager_serialize_uid_refs(Manager *m, FILE *f) { + manager_serialize_uid_refs_internal(m, f, &m->uid_refs, "destroy-ipc-uid"); +} + +static void manager_serialize_gid_refs(Manager *m, FILE *f) { + manager_serialize_uid_refs_internal(m, f, &m->gid_refs, "destroy-ipc-gid"); +} + +int manager_serialize( + Manager *m, + FILE *f, + FDSet *fds, + bool switching_root) { + + const char *t; + Unit *u; + int r; + + assert(m); + assert(f); + assert(fds); + + _cleanup_(manager_reloading_stopp) _unused_ Manager *reloading = manager_reloading_start(m); + + (void) serialize_item_format(f, "current-job-id", "%" PRIu32, m->current_job_id); + (void) serialize_item_format(f, "n-installed-jobs", "%u", m->n_installed_jobs); + (void) serialize_item_format(f, "n-failed-jobs", "%u", m->n_failed_jobs); + (void) serialize_bool(f, "taint-usr", m->taint_usr); + (void) serialize_bool(f, "ready-sent", m->ready_sent); + (void) serialize_bool(f, "taint-logged", m->taint_logged); + (void) serialize_bool(f, "service-watchdogs", m->service_watchdogs); + + /* After switching root, udevd has not been started yet. So, enumeration results should not be emitted. */ + (void) serialize_bool(f, "honor-device-enumeration", !switching_root); + + if (m->show_status_overridden != _SHOW_STATUS_INVALID) + (void) serialize_item(f, "show-status-overridden", + show_status_to_string(m->show_status_overridden)); + + if (m->log_level_overridden) + (void) serialize_item_format(f, "log-level-override", "%i", log_get_max_level()); + if (m->log_target_overridden) + (void) serialize_item(f, "log-target-override", log_target_to_string(log_get_target())); + + (void) serialize_usec(f, "runtime-watchdog-overridden", m->watchdog_overridden[WATCHDOG_RUNTIME]); + (void) serialize_usec(f, "reboot-watchdog-overridden", m->watchdog_overridden[WATCHDOG_REBOOT]); + (void) serialize_usec(f, "kexec-watchdog-overridden", m->watchdog_overridden[WATCHDOG_KEXEC]); + + for (ManagerTimestamp q = 0; q < _MANAGER_TIMESTAMP_MAX; q++) { + _cleanup_free_ char *joined = NULL; + + if (!manager_timestamp_shall_serialize(q)) + continue; + + joined = strjoin(manager_timestamp_to_string(q), "-timestamp"); + if (!joined) + return log_oom(); + + (void) serialize_dual_timestamp(f, joined, m->timestamps + q); + } + + if (!switching_root) + (void) serialize_strv(f, "env", m->client_environment); + + if (m->notify_fd >= 0) { + r = serialize_fd(f, fds, "notify-fd", m->notify_fd); + if (r < 0) + return r; + + (void) serialize_item(f, "notify-socket", m->notify_socket); + } + + if (m->cgroups_agent_fd >= 0) { + r = serialize_fd(f, fds, "cgroups-agent-fd", m->cgroups_agent_fd); + if (r < 0) + return r; + } + + if (m->user_lookup_fds[0] >= 0) { + int copy0, copy1; + + copy0 = fdset_put_dup(fds, m->user_lookup_fds[0]); + if (copy0 < 0) + return log_error_errno(copy0, "Failed to add user lookup fd to serialization: %m"); + + copy1 = fdset_put_dup(fds, m->user_lookup_fds[1]); + if (copy1 < 0) + return log_error_errno(copy1, "Failed to add user lookup fd to serialization: %m"); + + (void) serialize_item_format(f, "user-lookup", "%i %i", copy0, copy1); + } + + bus_track_serialize(m->subscribed, f, "subscribed"); + + r = dynamic_user_serialize(m, f, fds); + if (r < 0) + return r; + + manager_serialize_uid_refs(m, f); + manager_serialize_gid_refs(m, f); + + r = exec_runtime_serialize(m, f, fds); + if (r < 0) + return r; + + (void) fputc('\n', f); + + HASHMAP_FOREACH_KEY(u, t, m->units) { + if (u->id != t) + continue; + + /* Start marker */ + fputs(u->id, f); + fputc('\n', f); + + r = unit_serialize(u, f, fds, !switching_root); + if (r < 0) + return r; + } + + r = fflush_and_check(f); + if (r < 0) + return log_error_errno(r, "Failed to flush serialization: %m"); + + r = bus_fdset_add_all(m, fds); + if (r < 0) + return log_error_errno(r, "Failed to add bus sockets to serialization: %m"); + + return 0; +} + +static int manager_deserialize_one_unit(Manager *m, const char *name, FILE *f, FDSet *fds) { + Unit *u; + int r; + + r = manager_load_unit(m, name, NULL, NULL, &u); + if (r < 0) { + if (r == -ENOMEM) + return r; + return log_notice_errno(r, "Failed to load unit \"%s\", skipping deserialization: %m", name); + } + + r = unit_deserialize(u, f, fds); + if (r < 0) { + if (r == -ENOMEM) + return r; + return log_notice_errno(r, "Failed to deserialize unit \"%s\", skipping: %m", name); + } + + return 0; +} + +static int manager_deserialize_units(Manager *m, FILE *f, FDSet *fds) { + const char *unit_name; + int r; + + for (;;) { + _cleanup_free_ char *line = NULL; + /* Start marker */ + r = read_line(f, LONG_LINE_MAX, &line); + if (r < 0) + return log_error_errno(r, "Failed to read serialization line: %m"); + if (r == 0) + break; + + unit_name = strstrip(line); + + r = manager_deserialize_one_unit(m, unit_name, f, fds); + if (r == -ENOMEM) + return r; + if (r < 0) { + r = unit_deserialize_skip(f); + if (r < 0) + return r; + } + } + + return 0; +} + +usec_t manager_get_watchdog(Manager *m, WatchdogType t) { + assert(m); + + if (MANAGER_IS_USER(m)) + return USEC_INFINITY; + + if (timestamp_is_set(m->watchdog_overridden[t])) + return m->watchdog_overridden[t]; + + return m->watchdog[t]; +} + +void manager_set_watchdog(Manager *m, WatchdogType t, usec_t timeout) { + int r = 0; + + assert(m); + + if (MANAGER_IS_USER(m)) + return; + + if (m->watchdog[t] == timeout) + return; + + if (t == WATCHDOG_RUNTIME) + if (!timestamp_is_set(m->watchdog_overridden[WATCHDOG_RUNTIME])) { + if (timestamp_is_set(timeout)) { + r = watchdog_set_timeout(&timeout); + + if (r >= 0) + m->runtime_watchdog_running = true; + } else { + watchdog_close(true); + m->runtime_watchdog_running = false; + } + } + + m->watchdog[t] = timeout; +} + +int manager_override_watchdog(Manager *m, WatchdogType t, usec_t timeout) { + int r = 0; + + assert(m); + + if (MANAGER_IS_USER(m)) + return 0; + + if (m->watchdog_overridden[t] == timeout) + return 0; + + if (t == WATCHDOG_RUNTIME) { + usec_t *p; + + p = timestamp_is_set(timeout) ? &timeout : &m->watchdog[t]; + if (timestamp_is_set(*p)) { + r = watchdog_set_timeout(p); + + if (r >= 0) + m->runtime_watchdog_running = true; + } else { + watchdog_close(true); + m->runtime_watchdog_running = false; + } + } + + m->watchdog_overridden[t] = timeout; + + return 0; +} + +void manager_retry_runtime_watchdog(Manager *m) { + int r = 0; + + assert(m); + + if (timestamp_is_set(m->watchdog_overridden[WATCHDOG_RUNTIME])) + r = watchdog_set_timeout(&m->watchdog_overridden[WATCHDOG_RUNTIME]); + else + r = watchdog_set_timeout(&m->watchdog[WATCHDOG_RUNTIME]); + + if (r >= 0) + m->runtime_watchdog_running = true; +} + +static void manager_deserialize_uid_refs_one_internal( + Manager *m, + Hashmap** uid_refs, + const char *value) { + + uid_t uid; + uint32_t c; + int r; + + assert(m); + assert(uid_refs); + assert(value); + + r = parse_uid(value, &uid); + if (r < 0 || uid == 0) { + log_debug("Unable to parse UID reference serialization: " UID_FMT, uid); + return; + } + + r = hashmap_ensure_allocated(uid_refs, &trivial_hash_ops); + if (r < 0) { + log_oom(); + return; + } + + c = PTR_TO_UINT32(hashmap_get(*uid_refs, UID_TO_PTR(uid))); + if (c & DESTROY_IPC_FLAG) + return; + + c |= DESTROY_IPC_FLAG; + + r = hashmap_replace(*uid_refs, UID_TO_PTR(uid), UINT32_TO_PTR(c)); + if (r < 0) { + log_debug_errno(r, "Failed to add UID reference entry: %m"); + return; + } +} + +static void manager_deserialize_uid_refs_one(Manager *m, const char *value) { + manager_deserialize_uid_refs_one_internal(m, &m->uid_refs, value); +} + +static void manager_deserialize_gid_refs_one(Manager *m, const char *value) { + manager_deserialize_uid_refs_one_internal(m, &m->gid_refs, value); +} + +int manager_deserialize(Manager *m, FILE *f, FDSet *fds) { + int r = 0; + + assert(m); + assert(f); + + if (DEBUG_LOGGING) { + if (fdset_isempty(fds)) + log_debug("No file descriptors passed"); + else { + int fd; + + FDSET_FOREACH(fd, fds) { + _cleanup_free_ char *fn = NULL; + + r = fd_get_path(fd, &fn); + if (r < 0) + log_debug_errno(r, "Received serialized fd %i → %m", fd); + else + log_debug("Received serialized fd %i → %s", fd, strna(fn)); + } + } + } + + log_debug("Deserializing state..."); + + /* If we are not in reload mode yet, enter it now. Not that this is recursive, a caller might already have + * increased it to non-zero, which is why we just increase it by one here and down again at the end of this + * call. */ + _cleanup_(manager_reloading_stopp) _unused_ Manager *reloading = manager_reloading_start(m); + + for (;;) { + _cleanup_free_ char *line = NULL; + const char *val, *l; + + r = read_line(f, LONG_LINE_MAX, &line); + if (r < 0) + return log_error_errno(r, "Failed to read serialization line: %m"); + if (r == 0) + break; + + l = strstrip(line); + if (isempty(l)) /* end marker */ + break; + + if ((val = startswith(l, "current-job-id="))) { + uint32_t id; + + if (safe_atou32(val, &id) < 0) + log_notice("Failed to parse current job id value '%s', ignoring.", val); + else + m->current_job_id = MAX(m->current_job_id, id); + + } else if ((val = startswith(l, "n-installed-jobs="))) { + uint32_t n; + + if (safe_atou32(val, &n) < 0) + log_notice("Failed to parse installed jobs counter '%s', ignoring.", val); + else + m->n_installed_jobs += n; + + } else if ((val = startswith(l, "n-failed-jobs="))) { + uint32_t n; + + if (safe_atou32(val, &n) < 0) + log_notice("Failed to parse failed jobs counter '%s', ignoring.", val); + else + m->n_failed_jobs += n; + + } else if ((val = startswith(l, "taint-usr="))) { + int b; + + b = parse_boolean(val); + if (b < 0) + log_notice("Failed to parse taint /usr flag '%s', ignoring.", val); + else + m->taint_usr = m->taint_usr || b; + + } else if ((val = startswith(l, "ready-sent="))) { + int b; + + b = parse_boolean(val); + if (b < 0) + log_notice("Failed to parse ready-sent flag '%s', ignoring.", val); + else + m->ready_sent = m->ready_sent || b; + + } else if ((val = startswith(l, "taint-logged="))) { + int b; + + b = parse_boolean(val); + if (b < 0) + log_notice("Failed to parse taint-logged flag '%s', ignoring.", val); + else + m->taint_logged = m->taint_logged || b; + + } else if ((val = startswith(l, "service-watchdogs="))) { + int b; + + b = parse_boolean(val); + if (b < 0) + log_notice("Failed to parse service-watchdogs flag '%s', ignoring.", val); + else + m->service_watchdogs = b; + + } else if ((val = startswith(l, "honor-device-enumeration="))) { + int b; + + b = parse_boolean(val); + if (b < 0) + log_notice("Failed to parse honor-device-enumeration flag '%s', ignoring.", val); + else + m->honor_device_enumeration = b; + + } else if ((val = startswith(l, "show-status-overridden="))) { + ShowStatus s; + + s = show_status_from_string(val); + if (s < 0) + log_notice("Failed to parse show-status-overridden flag '%s', ignoring.", val); + else + manager_override_show_status(m, s, "deserialize"); + + } else if ((val = startswith(l, "log-level-override="))) { + int level; + + level = log_level_from_string(val); + if (level < 0) + log_notice("Failed to parse log-level-override value '%s', ignoring.", val); + else + manager_override_log_level(m, level); + + } else if ((val = startswith(l, "log-target-override="))) { + LogTarget target; + + target = log_target_from_string(val); + if (target < 0) + log_notice("Failed to parse log-target-override value '%s', ignoring.", val); + else + manager_override_log_target(m, target); + + } else if ((val = startswith(l, "runtime-watchdog-overridden="))) { + usec_t t; + + if (deserialize_usec(val, &t) < 0) + log_notice("Failed to parse runtime-watchdog-overridden value '%s', ignoring.", val); + else + manager_override_watchdog(m, WATCHDOG_RUNTIME, t); + + } else if ((val = startswith(l, "reboot-watchdog-overridden="))) { + usec_t t; + + if (deserialize_usec(val, &t) < 0) + log_notice("Failed to parse reboot-watchdog-overridden value '%s', ignoring.", val); + else + manager_override_watchdog(m, WATCHDOG_REBOOT, t); + + } else if ((val = startswith(l, "kexec-watchdog-overridden="))) { + usec_t t; + + if (deserialize_usec(val, &t) < 0) + log_notice("Failed to parse kexec-watchdog-overridden value '%s', ignoring.", val); + else + manager_override_watchdog(m, WATCHDOG_KEXEC, t); + + } else if (startswith(l, "env=")) { + r = deserialize_environment(l + 4, &m->client_environment); + if (r < 0) + log_notice_errno(r, "Failed to parse environment entry: \"%s\", ignoring: %m", l); + + } else if ((val = startswith(l, "notify-fd="))) { + int fd; + + if (safe_atoi(val, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) + log_notice("Failed to parse notify fd, ignoring: \"%s\"", val); + else { + m->notify_event_source = sd_event_source_unref(m->notify_event_source); + safe_close(m->notify_fd); + m->notify_fd = fdset_remove(fds, fd); + } + + } else if ((val = startswith(l, "notify-socket="))) { + r = free_and_strdup(&m->notify_socket, val); + if (r < 0) + return r; + + } else if ((val = startswith(l, "cgroups-agent-fd="))) { + int fd; + + if (safe_atoi(val, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) + log_notice("Failed to parse cgroups agent fd, ignoring.: %s", val); + else { + m->cgroups_agent_event_source = sd_event_source_unref(m->cgroups_agent_event_source); + safe_close(m->cgroups_agent_fd); + m->cgroups_agent_fd = fdset_remove(fds, fd); + } + + } else if ((val = startswith(l, "user-lookup="))) { + int fd0, fd1; + + if (sscanf(val, "%i %i", &fd0, &fd1) != 2 || fd0 < 0 || fd1 < 0 || fd0 == fd1 || !fdset_contains(fds, fd0) || !fdset_contains(fds, fd1)) + log_notice("Failed to parse user lookup fd, ignoring: %s", val); + else { + m->user_lookup_event_source = sd_event_source_unref(m->user_lookup_event_source); + safe_close_pair(m->user_lookup_fds); + m->user_lookup_fds[0] = fdset_remove(fds, fd0); + m->user_lookup_fds[1] = fdset_remove(fds, fd1); + } + + } else if ((val = startswith(l, "dynamic-user="))) + dynamic_user_deserialize_one(m, val, fds); + else if ((val = startswith(l, "destroy-ipc-uid="))) + manager_deserialize_uid_refs_one(m, val); + else if ((val = startswith(l, "destroy-ipc-gid="))) + manager_deserialize_gid_refs_one(m, val); + else if ((val = startswith(l, "exec-runtime="))) + (void) exec_runtime_deserialize_one(m, val, fds); + else if ((val = startswith(l, "subscribed="))) { + + if (strv_extend(&m->deserialized_subscribed, val) < 0) + return -ENOMEM; + + } else { + ManagerTimestamp q; + + for (q = 0; q < _MANAGER_TIMESTAMP_MAX; q++) { + val = startswith(l, manager_timestamp_to_string(q)); + if (!val) + continue; + + val = startswith(val, "-timestamp="); + if (val) + break; + } + + if (q < _MANAGER_TIMESTAMP_MAX) /* found it */ + (void) deserialize_dual_timestamp(val, m->timestamps + q); + else if (!startswith(l, "kdbus-fd=")) /* ignore kdbus */ + log_notice("Unknown serialization item '%s', ignoring.", l); + } + } + + return manager_deserialize_units(m, f, fds); +} + +int manager_reload(Manager *m) { + _cleanup_(manager_reloading_stopp) Manager *reloading = NULL; + _cleanup_fdset_free_ FDSet *fds = NULL; + _cleanup_fclose_ FILE *f = NULL; + int r; + + assert(m); + + r = manager_open_serialization(m, &f); + if (r < 0) + return log_error_errno(r, "Failed to create serialization file: %m"); + + fds = fdset_new(); + if (!fds) + return log_oom(); + + /* We are officially in reload mode from here on. */ + reloading = manager_reloading_start(m); + + r = manager_serialize(m, f, fds, false); + if (r < 0) + return r; + + if (fseeko(f, 0, SEEK_SET) < 0) + return log_error_errno(errno, "Failed to seek to beginning of serialization: %m"); + + /* 💀 This is the point of no return, from here on there is no way back. 💀 */ + reloading = NULL; + + bus_manager_send_reloading(m, true); + + /* Start by flushing out all jobs and units, all generated units, all runtime environments, all dynamic users + * and everything else that is worth flushing out. We'll get it all back from the serialization — if we need + * it.*/ + + manager_clear_jobs_and_units(m); + lookup_paths_flush_generator(&m->lookup_paths); + lookup_paths_free(&m->lookup_paths); + exec_runtime_vacuum(m); + dynamic_user_vacuum(m, false); + m->uid_refs = hashmap_free(m->uid_refs); + m->gid_refs = hashmap_free(m->gid_refs); + + r = lookup_paths_init(&m->lookup_paths, m->unit_file_scope, 0, NULL); + if (r < 0) + log_warning_errno(r, "Failed to initialize path lookup table, ignoring: %m"); + + (void) manager_run_environment_generators(m); + (void) manager_run_generators(m); + + lookup_paths_log(&m->lookup_paths); + + /* We flushed out generated files, for which we don't watch mtime, so we should flush the old map. */ + manager_free_unit_name_maps(m); + + /* First, enumerate what we can from kernel and suchlike */ + manager_enumerate_perpetual(m); + manager_enumerate(m); + + /* Second, deserialize our stored data */ + r = manager_deserialize(m, f, fds); + if (r < 0) + log_warning_errno(r, "Deserialization failed, proceeding anyway: %m"); + + /* We don't need the serialization anymore */ + f = safe_fclose(f); + + /* Re-register notify_fd as event source, and set up other sockets/communication channels we might need */ + (void) manager_setup_notify(m); + (void) manager_setup_cgroups_agent(m); + (void) manager_setup_user_lookup_fd(m); + + /* Third, fire things up! */ + manager_coldplug(m); + + /* Clean up runtime objects no longer referenced */ + manager_vacuum(m); + + /* Consider the reload process complete now. */ + assert(m->n_reloading > 0); + m->n_reloading--; + + /* On manager reloading, device tag data should exists, thus, we should honor the results of device + * enumeration. The flag should be always set correctly by the serialized data, but it may fail. So, + * let's always set the flag here for safety. */ + m->honor_device_enumeration = true; + + manager_ready(m); + + m->send_reloading_done = true; + return 0; +} + +void manager_reset_failed(Manager *m) { + Unit *u; + + assert(m); + + HASHMAP_FOREACH(u, m->units) + 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); +} + +static void log_taint_string(Manager *m) { + _cleanup_free_ char *taint = NULL; + + assert(m); + + if (MANAGER_IS_USER(m) || m->taint_logged) + return; + + m->taint_logged = true; /* only check for taint once */ + + taint = manager_taint_string(m); + if (isempty(taint)) + return; + + log_struct(LOG_NOTICE, + LOG_MESSAGE("System is tainted: %s", taint), + "TAINT=%s", taint, + "MESSAGE_ID=" SD_MESSAGE_TAINTED_STR); +} + +static void manager_notify_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; + + if (MANAGER_IS_TEST_RUN(m)) + return; + + if (MANAGER_IS_SYSTEM(m) && detect_container() <= 0) { + char ts[FORMAT_TIMESPAN_MAX]; + char buf[FORMAT_TIMESPAN_MAX + STRLEN(" (firmware) + ") + FORMAT_TIMESPAN_MAX + STRLEN(" (loader) + ")] + = {}; + char *p = buf; + size_t size = sizeof buf; + + /* Note that MANAGER_TIMESTAMP_KERNEL's monotonic value is always at 0, and + * MANAGER_TIMESTAMP_FIRMWARE's and MANAGER_TIMESTAMP_LOADER's monotonic value should be considered + * negative values. */ + + firmware_usec = m->timestamps[MANAGER_TIMESTAMP_FIRMWARE].monotonic - m->timestamps[MANAGER_TIMESTAMP_LOADER].monotonic; + loader_usec = m->timestamps[MANAGER_TIMESTAMP_LOADER].monotonic - m->timestamps[MANAGER_TIMESTAMP_KERNEL].monotonic; + userspace_usec = m->timestamps[MANAGER_TIMESTAMP_FINISH].monotonic - m->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic; + total_usec = m->timestamps[MANAGER_TIMESTAMP_FIRMWARE].monotonic + m->timestamps[MANAGER_TIMESTAMP_FINISH].monotonic; + + if (firmware_usec > 0) + size = strpcpyf(&p, size, "%s (firmware) + ", format_timespan(ts, sizeof(ts), firmware_usec, USEC_PER_MSEC)); + if (loader_usec > 0) + size = strpcpyf(&p, size, "%s (loader) + ", format_timespan(ts, sizeof(ts), loader_usec, USEC_PER_MSEC)); + + if (dual_timestamp_is_set(&m->timestamps[MANAGER_TIMESTAMP_INITRD])) { + + /* The initrd case on bare-metal*/ + kernel_usec = m->timestamps[MANAGER_TIMESTAMP_INITRD].monotonic - m->timestamps[MANAGER_TIMESTAMP_KERNEL].monotonic; + initrd_usec = m->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic - m->timestamps[MANAGER_TIMESTAMP_INITRD].monotonic; + + log_struct(LOG_INFO, + "MESSAGE_ID=" SD_MESSAGE_STARTUP_FINISHED_STR, + "KERNEL_USEC="USEC_FMT, kernel_usec, + "INITRD_USEC="USEC_FMT, initrd_usec, + "USERSPACE_USEC="USEC_FMT, userspace_usec, + LOG_MESSAGE("Startup finished in %s%s (kernel) + %s (initrd) + %s (userspace) = %s.", + buf, + 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))); + } else { + /* The initrd-less case on bare-metal*/ + + kernel_usec = m->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic - m->timestamps[MANAGER_TIMESTAMP_KERNEL].monotonic; + initrd_usec = 0; + + log_struct(LOG_INFO, + "MESSAGE_ID=" SD_MESSAGE_STARTUP_FINISHED_STR, + "KERNEL_USEC="USEC_FMT, kernel_usec, + "USERSPACE_USEC="USEC_FMT, userspace_usec, + LOG_MESSAGE("Startup finished in %s%s (kernel) + %s (userspace) = %s.", + buf, + 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))); + } + } else { + /* The container and --user case */ + firmware_usec = loader_usec = initrd_usec = kernel_usec = 0; + total_usec = userspace_usec = m->timestamps[MANAGER_TIMESTAMP_FINISH].monotonic - m->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic; + + log_struct(LOG_INFO, + "MESSAGE_ID=" SD_MESSAGE_USER_STARTUP_FINISHED_STR, + "USERSPACE_USEC="USEC_FMT, userspace_usec, + LOG_MESSAGE("Startup finished in %s.", + format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC))); + } + + bus_manager_send_finished(m, firmware_usec, loader_usec, kernel_usec, initrd_usec, userspace_usec, total_usec); + + sd_notifyf(false, + m->ready_sent ? "STATUS=Startup finished in %s." + : "READY=1\n" + "STATUS=Startup finished in %s.", + format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC)); + m->ready_sent = true; + + log_taint_string(m); +} + +static void manager_send_ready(Manager *m) { + assert(m); + + /* We send READY=1 on reaching basic.target only when running in --user mode. */ + if (!MANAGER_IS_USER(m) || m->ready_sent) + return; + + m->ready_sent = true; + + sd_notifyf(false, + "READY=1\n" + "STATUS=Reached " SPECIAL_BASIC_TARGET "."); +} + +static void manager_check_basic_target(Manager *m) { + Unit *u; + + assert(m); + + /* Small shortcut */ + if (m->ready_sent && m->taint_logged) + return; + + u = manager_get_unit(m, SPECIAL_BASIC_TARGET); + if (!u || !UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) + return; + + /* For user managers, send out READY=1 as soon as we reach basic.target */ + manager_send_ready(m); + + /* Log the taint string as soon as we reach basic.target */ + log_taint_string(m); +} + +void manager_check_finished(Manager *m) { + assert(m); + + if (MANAGER_IS_RELOADING(m)) + return; + + /* Verify that we have entered the event loop already, and not left it again. */ + if (!MANAGER_IS_RUNNING(m)) + return; + + manager_check_basic_target(m); + + if (hashmap_size(m->jobs) > 0) { + if (m->jobs_in_progress_event_source) + /* Ignore any failure, this is only for feedback */ + (void) sd_event_source_set_time(m->jobs_in_progress_event_source, + manager_watch_jobs_next_time(m)); + return; + } + + /* The jobs hashmap tends to grow a lot during boot, and then it's not reused until shutdown. Let's + kill the hashmap if it is relatively large. */ + if (hashmap_buckets(m->jobs) > hashmap_size(m->units) / 10) + m->jobs = hashmap_free(m->jobs); + + manager_flip_auto_status(m, false, "boot finished"); + + /* Notify Type=idle units that we are done now */ + manager_close_idle_pipe(m); + + /* Turn off confirm spawn now */ + m->confirm_spawn = NULL; + + /* No need to update ask password status when we're going non-interactive */ + manager_close_ask_password(m); + + /* This is no longer the first boot */ + manager_set_first_boot(m, false); + + if (MANAGER_IS_FINISHED(m)) + return; + + dual_timestamp_get(m->timestamps + MANAGER_TIMESTAMP_FINISH); + + manager_notify_finished(m); + + manager_invalidate_startup_units(m); +} + +static bool generator_path_any(const char* const* paths) { + char **path; + bool found = false; + + /* Optimize by skipping the whole process by not creating output directories + * if no generators are found. */ + STRV_FOREACH(path, (char**) paths) + if (access(*path, F_OK) == 0) + found = true; + else if (errno != ENOENT) + log_warning_errno(errno, "Failed to open generator directory %s: %m", *path); + + return found; +} + +static int manager_run_environment_generators(Manager *m) { + char **tmp = NULL; /* this is only used in the forked process, no cleanup here */ + _cleanup_strv_free_ char **paths = NULL; + void* args[] = { + [STDOUT_GENERATE] = &tmp, + [STDOUT_COLLECT] = &tmp, + [STDOUT_CONSUME] = &m->transient_environment, + }; + int r; + + if (MANAGER_IS_TEST_RUN(m) && !(m->test_run_flags & MANAGER_TEST_RUN_ENV_GENERATORS)) + return 0; + + paths = env_generator_binary_paths(MANAGER_IS_SYSTEM(m)); + if (!paths) + return log_oom(); + + if (!generator_path_any((const char* const*) paths)) + return 0; + + RUN_WITH_UMASK(0022) + r = execute_directories((const char* const*) paths, DEFAULT_TIMEOUT_USEC, gather_environment, + args, NULL, m->transient_environment, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS); + return r; +} + +static int manager_run_generators(Manager *m) { + _cleanup_strv_free_ char **paths = NULL; + const char *argv[5]; + int r; + + assert(m); + + if (MANAGER_IS_TEST_RUN(m) && !(m->test_run_flags & MANAGER_TEST_RUN_GENERATORS)) + return 0; + + paths = generator_binary_paths(m->unit_file_scope); + if (!paths) + return log_oom(); + + if (!generator_path_any((const char* const*) paths)) + return 0; + + r = lookup_paths_mkdir_generator(&m->lookup_paths); + if (r < 0) { + log_error_errno(r, "Failed to create generator directories: %m"); + goto finish; + } + + argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */ + argv[1] = m->lookup_paths.generator; + argv[2] = m->lookup_paths.generator_early; + argv[3] = m->lookup_paths.generator_late; + argv[4] = NULL; + + RUN_WITH_UMASK(0022) + (void) execute_directories((const char* const*) paths, DEFAULT_TIMEOUT_USEC, NULL, NULL, + (char**) argv, m->transient_environment, EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS); + + r = 0; + +finish: + lookup_paths_trim_generator(&m->lookup_paths); + return r; +} + +int manager_transient_environment_add(Manager *m, char **plus) { + char **a; + + assert(m); + + if (strv_isempty(plus)) + return 0; + + a = strv_env_merge(2, m->transient_environment, plus); + if (!a) + return log_oom(); + + sanitize_environment(a); + + return strv_free_and_replace(m->transient_environment, a); +} + +int manager_client_environment_modify( + Manager *m, + char **minus, + char **plus) { + + char **a = NULL, **b = NULL, **l; + + assert(m); + + if (strv_isempty(minus) && strv_isempty(plus)) + return 0; + + l = m->client_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) { + strv_free(a); + return -ENOMEM; + } + + l = b; + } + + if (m->client_environment != l) + strv_free(m->client_environment); + + if (a != l) + strv_free(a); + if (b != l) + strv_free(b); + + m->client_environment = sanitize_environment(l); + return 0; +} + +int manager_get_effective_environment(Manager *m, char ***ret) { + char **l; + + assert(m); + assert(ret); + + l = strv_env_merge(2, m->transient_environment, m->client_environment); + if (!l) + return -ENOMEM; + + *ret = l; + return 0; +} + +int manager_set_default_rlimits(Manager *m, struct rlimit **default_rlimit) { + assert(m); + + for (unsigned i = 0; i < _RLIMIT_MAX; i++) { + m->rlimit[i] = mfree(m->rlimit[i]); + + if (!default_rlimit[i]) + continue; + + m->rlimit[i] = newdup(struct rlimit, default_rlimit[i], 1); + if (!m->rlimit[i]) + return log_oom(); + } + + return 0; +} + +void manager_recheck_dbus(Manager *m) { + assert(m); + + /* Connects to the bus if the dbus service and socket are running. If we are running in user mode this is all + * it does. In system mode we'll also connect to the system bus (which will most likely just reuse the + * connection of the API bus). That's because the system bus after all runs as service of the system instance, + * while in the user instance we can assume it's already there. */ + + if (MANAGER_IS_RELOADING(m)) + return; /* don't check while we are reloading… */ + + if (manager_dbus_is_running(m, false)) { + (void) bus_init_api(m); + + if (MANAGER_IS_SYSTEM(m)) + (void) bus_init_system(m); + } else { + (void) bus_done_api(m); + + if (MANAGER_IS_SYSTEM(m)) + (void) bus_done_system(m); + } +} + +static bool manager_journal_is_running(Manager *m) { + Unit *u; + + assert(m); + + if (MANAGER_IS_TEST_RUN(m)) + return false; + + /* If we are the user manager we can safely assume that the journal is up */ + if (!MANAGER_IS_SYSTEM(m)) + return true; + + /* Check that the socket is not only up, but in RUNNING state */ + u = manager_get_unit(m, SPECIAL_JOURNALD_SOCKET); + if (!u) + return false; + if (SOCKET(u)->state != SOCKET_RUNNING) + return false; + + /* Similar, check if the daemon itself is fully up, too */ + u = manager_get_unit(m, SPECIAL_JOURNALD_SERVICE); + if (!u) + return false; + if (!IN_SET(SERVICE(u)->state, SERVICE_RELOAD, SERVICE_RUNNING)) + return false; + + return true; +} + +void disable_printk_ratelimit(void) { + /* Disable kernel's printk ratelimit. + * + * Logging to /dev/kmsg is most useful during early boot and shutdown, where normal logging + * mechanisms are not available. The semantics of this sysctl are such that any kernel command-line + * setting takes precedence. */ + int r; + + r = sysctl_write("kernel/printk_devkmsg", "on"); + if (r < 0) + log_debug_errno(r, "Failed to set sysctl kernel.printk_devkmsg=on: %m"); +} + +void manager_recheck_journal(Manager *m) { + + assert(m); + + /* Don't bother with this unless we are in the special situation of being PID 1 */ + if (getpid_cached() != 1) + return; + + /* Don't check this while we are reloading, things might still change */ + if (MANAGER_IS_RELOADING(m)) + return; + + /* The journal is fully and entirely up? If so, let's permit logging to it, if that's configured. If the + * journal is down, don't ever log to it, otherwise we might end up deadlocking ourselves as we might trigger + * an activation ourselves we can't fulfill. */ + log_set_prohibit_ipc(!manager_journal_is_running(m)); + log_open(); +} + +static ShowStatus manager_get_show_status(Manager *m) { + assert(m); + + if (MANAGER_IS_USER(m)) + return _SHOW_STATUS_INVALID; + + if (m->show_status_overridden != _SHOW_STATUS_INVALID) + return m->show_status_overridden; + + return m->show_status; +} + +bool manager_get_show_status_on(Manager *m) { + assert(m); + + return show_status_on(manager_get_show_status(m)); +} + +static void set_show_status_marker(bool b) { + if (b) + (void) touch("/run/systemd/show-status"); + else + (void) unlink("/run/systemd/show-status"); +} + +void manager_set_show_status(Manager *m, ShowStatus mode, const char *reason) { + assert(m); + assert(reason); + assert(mode >= 0 && mode < _SHOW_STATUS_MAX); + + if (MANAGER_IS_USER(m)) + return; + + if (mode == m->show_status) + return; + + if (m->show_status_overridden == _SHOW_STATUS_INVALID) { + bool enabled; + + enabled = show_status_on(mode); + log_debug("%s (%s) showing of status (%s).", + enabled ? "Enabling" : "Disabling", + strna(show_status_to_string(mode)), + reason); + + set_show_status_marker(enabled); + } + + m->show_status = mode; +} + +void manager_override_show_status(Manager *m, ShowStatus mode, const char *reason) { + assert(m); + assert(mode < _SHOW_STATUS_MAX); + + if (MANAGER_IS_USER(m)) + return; + + if (mode == m->show_status_overridden) + return; + + m->show_status_overridden = mode; + + if (mode == _SHOW_STATUS_INVALID) + mode = m->show_status; + + log_debug("%s (%s) showing of status (%s).", + m->show_status_overridden != _SHOW_STATUS_INVALID ? "Overriding" : "Restoring", + strna(show_status_to_string(mode)), + reason); + + set_show_status_marker(show_status_on(mode)); +} + +const char *manager_get_confirm_spawn(Manager *m) { + static int last_errno = 0; + struct stat st; + int r; + + assert(m); + + /* Here's the deal: we want to test the validity of the console but don't want + * PID1 to go through the whole console process which might block. But we also + * want to warn the user only once if something is wrong with the console so we + * cannot do the sanity checks after spawning our children. So here we simply do + * really basic tests to hopefully trap common errors. + * + * If the console suddenly disappear at the time our children will really it + * then they will simply fail to acquire it and a positive answer will be + * assumed. New children will fall back to /dev/console though. + * + * Note: TTYs are devices that can come and go any time, and frequently aren't + * available yet during early boot (consider a USB rs232 dongle...). If for any + * reason the configured console is not ready, we fall back to the default + * console. */ + + if (!m->confirm_spawn || path_equal(m->confirm_spawn, "/dev/console")) + return m->confirm_spawn; + + if (stat(m->confirm_spawn, &st) < 0) { + r = -errno; + goto fail; + } + + if (!S_ISCHR(st.st_mode)) { + r = -ENOTTY; + goto fail; + } + + last_errno = 0; + return m->confirm_spawn; + +fail: + if (last_errno != r) + last_errno = log_warning_errno(r, "Failed to open %s, using default console: %m", m->confirm_spawn); + + return "/dev/console"; +} + +void manager_set_first_boot(Manager *m, bool b) { + assert(m); + + if (!MANAGER_IS_SYSTEM(m)) + return; + + if (m->first_boot != (int) b) { + if (b) + (void) touch("/run/systemd/first-boot"); + else + (void) unlink("/run/systemd/first-boot"); + } + + m->first_boot = b; +} + +void manager_disable_confirm_spawn(void) { + (void) touch("/run/systemd/confirm_spawn_disabled"); +} + +bool manager_is_confirm_spawn_disabled(Manager *m) { + if (!m->confirm_spawn) + return true; + + return access("/run/systemd/confirm_spawn_disabled", F_OK) >= 0; +} + +static bool manager_should_show_status(Manager *m, StatusType type) { + assert(m); + + if (!MANAGER_IS_SYSTEM(m)) + return false; + + if (m->no_console_output) + return false; + + if (!IN_SET(manager_state(m), MANAGER_INITIALIZING, MANAGER_STARTING, MANAGER_STOPPING)) + return false; + + /* If we cannot find out the status properly, just proceed. */ + if (type != STATUS_TYPE_EMERGENCY && manager_check_ask_password(m) > 0) + return false; + + if (type == STATUS_TYPE_NOTICE && m->show_status != SHOW_STATUS_NO) + return true; + + return manager_get_show_status_on(m); +} + +void manager_status_printf(Manager *m, StatusType type, const char *status, const char *format, ...) { + va_list ap; + + /* If m is NULL, assume we're after shutdown and let the messages through. */ + + if (m && !manager_should_show_status(m, type)) + return; + + /* XXX We should totally drop the check for ephemeral here + * and thus effectively make 'Type=idle' pointless. */ + if (type == STATUS_TYPE_EPHEMERAL && m && m->n_on_console > 0) + return; + + va_start(ap, format); + status_vprintf(status, SHOW_STATUS_ELLIPSIZE|(type == STATUS_TYPE_EPHEMERAL ? SHOW_STATUS_EPHEMERAL : 0), format, ap); + va_end(ap); +} + +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_simplify(p, false); + + return hashmap_get(m->units_requiring_mounts_for, streq(p, "/") ? "" : p); +} + +int manager_update_failed_units(Manager *m, Unit *u, bool failed) { + unsigned size; + int r; + + assert(m); + assert(u->manager == m); + + size = set_size(m->failed_units); + + if (failed) { + r = set_ensure_put(&m->failed_units, NULL, u); + if (r < 0) + return log_oom(); + } else + (void) set_remove(m->failed_units, u); + + if (set_size(m->failed_units) != size) + bus_manager_send_change_signal(m); + + return 0; +} + +ManagerState manager_state(Manager *m) { + Unit *u; + + assert(m); + + /* Is the special shutdown target active or queued? If so, we are in shutdown state */ + u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET); + if (u && unit_active_or_pending(u)) + return MANAGER_STOPPING; + + /* Did we ever finish booting? If not then we are still starting up */ + if (!MANAGER_IS_FINISHED(m)) { + + u = manager_get_unit(m, SPECIAL_BASIC_TARGET); + if (!u || !UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) + return MANAGER_INITIALIZING; + + return MANAGER_STARTING; + } + + if (MANAGER_IS_SYSTEM(m)) { + /* Are the rescue or emergency targets active or queued? If so we are in maintenance state */ + u = manager_get_unit(m, SPECIAL_RESCUE_TARGET); + if (u && unit_active_or_pending(u)) + return MANAGER_MAINTENANCE; + + u = manager_get_unit(m, SPECIAL_EMERGENCY_TARGET); + if (u && unit_active_or_pending(u)) + return MANAGER_MAINTENANCE; + } + + /* Are there any failed units? If so, we are in degraded mode */ + if (set_size(m->failed_units) > 0) + return MANAGER_DEGRADED; + + return MANAGER_RUNNING; +} + +static void manager_unref_uid_internal( + Manager *m, + Hashmap **uid_refs, + uid_t uid, + bool destroy_now, + int (*_clean_ipc)(uid_t uid)) { + + uint32_t c, n; + + assert(m); + assert(uid_refs); + assert(uid_is_valid(uid)); + assert(_clean_ipc); + + /* A generic implementation, covering both manager_unref_uid() and manager_unref_gid(), under the assumption + * that uid_t and gid_t are actually defined the same way, with the same validity rules. + * + * We store a hashmap where the UID/GID is they key and the value is a 32bit reference counter, whose highest + * bit is used as flag for marking UIDs/GIDs whose IPC objects to remove when the last reference to the UID/GID + * is dropped. The flag is set to on, once at least one reference from a unit where RemoveIPC= is set is added + * on a UID/GID. It is reset when the UID's/GID's reference counter drops to 0 again. */ + + assert_cc(sizeof(uid_t) == sizeof(gid_t)); + assert_cc(UID_INVALID == (uid_t) GID_INVALID); + + if (uid == 0) /* We don't keep track of root, and will never destroy it */ + return; + + c = PTR_TO_UINT32(hashmap_get(*uid_refs, UID_TO_PTR(uid))); + + n = c & ~DESTROY_IPC_FLAG; + assert(n > 0); + n--; + + if (destroy_now && n == 0) { + hashmap_remove(*uid_refs, UID_TO_PTR(uid)); + + if (c & DESTROY_IPC_FLAG) { + log_debug("%s " UID_FMT " is no longer referenced, cleaning up its IPC.", + _clean_ipc == clean_ipc_by_uid ? "UID" : "GID", + uid); + (void) _clean_ipc(uid); + } + } else { + c = n | (c & DESTROY_IPC_FLAG); + assert_se(hashmap_update(*uid_refs, UID_TO_PTR(uid), UINT32_TO_PTR(c)) >= 0); + } +} + +void manager_unref_uid(Manager *m, uid_t uid, bool destroy_now) { + manager_unref_uid_internal(m, &m->uid_refs, uid, destroy_now, clean_ipc_by_uid); +} + +void manager_unref_gid(Manager *m, gid_t gid, bool destroy_now) { + manager_unref_uid_internal(m, &m->gid_refs, (uid_t) gid, destroy_now, clean_ipc_by_gid); +} + +static int manager_ref_uid_internal( + Manager *m, + Hashmap **uid_refs, + uid_t uid, + bool clean_ipc) { + + uint32_t c, n; + int r; + + assert(m); + assert(uid_refs); + assert(uid_is_valid(uid)); + + /* A generic implementation, covering both manager_ref_uid() and manager_ref_gid(), under the assumption + * that uid_t and gid_t are actually defined the same way, with the same validity rules. */ + + assert_cc(sizeof(uid_t) == sizeof(gid_t)); + assert_cc(UID_INVALID == (uid_t) GID_INVALID); + + if (uid == 0) /* We don't keep track of root, and will never destroy it */ + return 0; + + r = hashmap_ensure_allocated(uid_refs, &trivial_hash_ops); + if (r < 0) + return r; + + c = PTR_TO_UINT32(hashmap_get(*uid_refs, UID_TO_PTR(uid))); + + n = c & ~DESTROY_IPC_FLAG; + n++; + + if (n & DESTROY_IPC_FLAG) /* check for overflow */ + return -EOVERFLOW; + + c = n | (c & DESTROY_IPC_FLAG) | (clean_ipc ? DESTROY_IPC_FLAG : 0); + + return hashmap_replace(*uid_refs, UID_TO_PTR(uid), UINT32_TO_PTR(c)); +} + +int manager_ref_uid(Manager *m, uid_t uid, bool clean_ipc) { + return manager_ref_uid_internal(m, &m->uid_refs, uid, clean_ipc); +} + +int manager_ref_gid(Manager *m, gid_t gid, bool clean_ipc) { + return manager_ref_uid_internal(m, &m->gid_refs, (uid_t) gid, clean_ipc); +} + +static void manager_vacuum_uid_refs_internal( + Manager *m, + Hashmap **uid_refs, + int (*_clean_ipc)(uid_t uid)) { + + void *p, *k; + + assert(m); + assert(uid_refs); + assert(_clean_ipc); + + HASHMAP_FOREACH_KEY(p, k, *uid_refs) { + uint32_t c, n; + uid_t uid; + + uid = PTR_TO_UID(k); + c = PTR_TO_UINT32(p); + + n = c & ~DESTROY_IPC_FLAG; + if (n > 0) + continue; + + if (c & DESTROY_IPC_FLAG) { + log_debug("Found unreferenced %s " UID_FMT " after reload/reexec. Cleaning up.", + _clean_ipc == clean_ipc_by_uid ? "UID" : "GID", + uid); + (void) _clean_ipc(uid); + } + + assert_se(hashmap_remove(*uid_refs, k) == p); + } +} + +static void manager_vacuum_uid_refs(Manager *m) { + manager_vacuum_uid_refs_internal(m, &m->uid_refs, clean_ipc_by_uid); +} + +static void manager_vacuum_gid_refs(Manager *m) { + manager_vacuum_uid_refs_internal(m, &m->gid_refs, clean_ipc_by_gid); +} + +static void manager_vacuum(Manager *m) { + assert(m); + + /* Release any dynamic users no longer referenced */ + dynamic_user_vacuum(m, true); + + /* Release any references to UIDs/GIDs no longer referenced, and destroy any IPC owned by them */ + manager_vacuum_uid_refs(m); + manager_vacuum_gid_refs(m); + + /* Release any runtimes no longer referenced */ + exec_runtime_vacuum(m); +} + +int manager_dispatch_user_lookup_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) { + struct buffer { + uid_t uid; + gid_t gid; + char unit_name[UNIT_NAME_MAX+1]; + } _packed_ buffer; + + Manager *m = userdata; + ssize_t l; + size_t n; + Unit *u; + + assert_se(source); + assert_se(m); + + /* Invoked whenever a child process succeeded resolving its user/group to use and sent us the resulting UID/GID + * in a datagram. We parse the datagram here and pass it off to the unit, so that it can add a reference to the + * UID/GID so that it can destroy the UID/GID's IPC objects when the reference counter drops to 0. */ + + l = recv(fd, &buffer, sizeof(buffer), MSG_DONTWAIT); + if (l < 0) { + if (IN_SET(errno, EINTR, EAGAIN)) + return 0; + + return log_error_errno(errno, "Failed to read from user lookup fd: %m"); + } + + if ((size_t) l <= offsetof(struct buffer, unit_name)) { + log_warning("Received too short user lookup message, ignoring."); + return 0; + } + + if ((size_t) l > offsetof(struct buffer, unit_name) + UNIT_NAME_MAX) { + log_warning("Received too long user lookup message, ignoring."); + return 0; + } + + if (!uid_is_valid(buffer.uid) && !gid_is_valid(buffer.gid)) { + log_warning("Got user lookup message with invalid UID/GID pair, ignoring."); + return 0; + } + + n = (size_t) l - offsetof(struct buffer, unit_name); + if (memchr(buffer.unit_name, 0, n)) { + log_warning("Received lookup message with embedded NUL character, ignoring."); + return 0; + } + + buffer.unit_name[n] = 0; + u = manager_get_unit(m, buffer.unit_name); + if (!u) { + log_debug("Got user lookup message but unit doesn't exist, ignoring."); + return 0; + } + + log_unit_debug(u, "User lookup succeeded: uid=" UID_FMT " gid=" GID_FMT, buffer.uid, buffer.gid); + + unit_notify_user_lookup(u, buffer.uid, buffer.gid); + return 0; +} + +char *manager_taint_string(Manager *m) { + _cleanup_free_ char *destination = NULL, *overflowuid = NULL, *overflowgid = NULL; + char *buf, *e; + int r; + + /* Returns a "taint string", e.g. "local-hwclock:var-run-bad". + * Only things that are detected at runtime should be tagged + * here. For stuff that is set during compilation, emit a warning + * in the configuration phase. */ + + assert(m); + + buf = new(char, sizeof("split-usr:" + "cgroups-missing:" + "local-hwclock:" + "var-run-bad:" + "overflowuid-not-65534:" + "overflowgid-not-65534:")); + if (!buf) + return NULL; + + e = buf; + buf[0] = 0; + + if (m->taint_usr) + e = stpcpy(e, "split-usr:"); + + if (access("/proc/cgroups", F_OK) < 0) + e = stpcpy(e, "cgroups-missing:"); + + if (clock_is_localtime(NULL) > 0) + e = stpcpy(e, "local-hwclock:"); + + r = readlink_malloc("/var/run", &destination); + if (r < 0 || !PATH_IN_SET(destination, "../run", "/run")) + e = stpcpy(e, "var-run-bad:"); + + r = read_one_line_file("/proc/sys/kernel/overflowuid", &overflowuid); + if (r >= 0 && !streq(overflowuid, "65534")) + e = stpcpy(e, "overflowuid-not-65534:"); + + r = read_one_line_file("/proc/sys/kernel/overflowgid", &overflowgid); + if (r >= 0 && !streq(overflowgid, "65534")) + e = stpcpy(e, "overflowgid-not-65534:"); + + /* remove the last ':' */ + if (e != buf) + e[-1] = 0; + + return buf; +} + +void manager_ref_console(Manager *m) { + assert(m); + + m->n_on_console++; +} + +void manager_unref_console(Manager *m) { + + assert(m->n_on_console > 0); + m->n_on_console--; + + if (m->n_on_console == 0) + m->no_console_output = false; /* unset no_console_output flag, since the console is definitely free now */ +} + +void manager_override_log_level(Manager *m, int level) { + _cleanup_free_ char *s = NULL; + assert(m); + + if (!m->log_level_overridden) { + m->original_log_level = log_get_max_level(); + m->log_level_overridden = true; + } + + (void) log_level_to_string_alloc(level, &s); + log_info("Setting log level to %s.", strna(s)); + + log_set_max_level(level); +} + +void manager_restore_original_log_level(Manager *m) { + _cleanup_free_ char *s = NULL; + assert(m); + + if (!m->log_level_overridden) + return; + + (void) log_level_to_string_alloc(m->original_log_level, &s); + log_info("Restoring log level to original (%s).", strna(s)); + + log_set_max_level(m->original_log_level); + m->log_level_overridden = false; +} + +void manager_override_log_target(Manager *m, LogTarget target) { + assert(m); + + if (!m->log_target_overridden) { + m->original_log_target = log_get_target(); + m->log_target_overridden = true; + } + + log_info("Setting log target to %s.", log_target_to_string(target)); + log_set_target(target); +} + +void manager_restore_original_log_target(Manager *m) { + assert(m); + + if (!m->log_target_overridden) + return; + + log_info("Restoring log target to original %s.", log_target_to_string(m->original_log_target)); + + log_set_target(m->original_log_target); + m->log_target_overridden = false; +} + +ManagerTimestamp manager_timestamp_initrd_mangle(ManagerTimestamp s) { + if (in_initrd() && + s >= MANAGER_TIMESTAMP_SECURITY_START && + s <= MANAGER_TIMESTAMP_UNITS_LOAD_FINISH) + return s - MANAGER_TIMESTAMP_SECURITY_START + MANAGER_TIMESTAMP_INITRD_SECURITY_START; + return s; +} + +static const char *const manager_state_table[_MANAGER_STATE_MAX] = { + [MANAGER_INITIALIZING] = "initializing", + [MANAGER_STARTING] = "starting", + [MANAGER_RUNNING] = "running", + [MANAGER_DEGRADED] = "degraded", + [MANAGER_MAINTENANCE] = "maintenance", + [MANAGER_STOPPING] = "stopping", +}; + +DEFINE_STRING_TABLE_LOOKUP(manager_state, ManagerState); + +static const char *const manager_timestamp_table[_MANAGER_TIMESTAMP_MAX] = { + [MANAGER_TIMESTAMP_FIRMWARE] = "firmware", + [MANAGER_TIMESTAMP_LOADER] = "loader", + [MANAGER_TIMESTAMP_KERNEL] = "kernel", + [MANAGER_TIMESTAMP_INITRD] = "initrd", + [MANAGER_TIMESTAMP_USERSPACE] = "userspace", + [MANAGER_TIMESTAMP_FINISH] = "finish", + [MANAGER_TIMESTAMP_SECURITY_START] = "security-start", + [MANAGER_TIMESTAMP_SECURITY_FINISH] = "security-finish", + [MANAGER_TIMESTAMP_GENERATORS_START] = "generators-start", + [MANAGER_TIMESTAMP_GENERATORS_FINISH] = "generators-finish", + [MANAGER_TIMESTAMP_UNITS_LOAD_START] = "units-load-start", + [MANAGER_TIMESTAMP_UNITS_LOAD_FINISH] = "units-load-finish", + [MANAGER_TIMESTAMP_INITRD_SECURITY_START] = "initrd-security-start", + [MANAGER_TIMESTAMP_INITRD_SECURITY_FINISH] = "initrd-security-finish", + [MANAGER_TIMESTAMP_INITRD_GENERATORS_START] = "initrd-generators-start", + [MANAGER_TIMESTAMP_INITRD_GENERATORS_FINISH] = "initrd-generators-finish", + [MANAGER_TIMESTAMP_INITRD_UNITS_LOAD_START] = "initrd-units-load-start", + [MANAGER_TIMESTAMP_INITRD_UNITS_LOAD_FINISH] = "initrd-units-load-finish", +}; + +DEFINE_STRING_TABLE_LOOKUP(manager_timestamp, ManagerTimestamp); + +static const char* const oom_policy_table[_OOM_POLICY_MAX] = { + [OOM_CONTINUE] = "continue", + [OOM_STOP] = "stop", + [OOM_KILL] = "kill", +}; + +DEFINE_STRING_TABLE_LOOKUP(oom_policy, OOMPolicy); |