/* SPDX-License-Identifier: LGPL-2.1+ */ #include #include #include #include #include #include "sd-messages.h" #include "alloc-util.h" #include "async.h" #include "bus-error.h" #include "bus-kernel.h" #include "bus-util.h" #include "dbus-service.h" #include "dbus-unit.h" #include "def.h" #include "env-util.h" #include "escape.h" #include "exit-status.h" #include "fd-util.h" #include "fileio.h" #include "format-util.h" #include "fs-util.h" #include "load-dropin.h" #include "load-fragment.h" #include "log.h" #include "manager.h" #include "parse-util.h" #include "path-util.h" #include "process-util.h" #include "serialize.h" #include "service.h" #include "signal-util.h" #include "special.h" #include "stdio-util.h" #include "string-table.h" #include "string-util.h" #include "strv.h" #include "unit-name.h" #include "unit.h" #include "utf8.h" #include "util.h" static const UnitActiveState state_translation_table[_SERVICE_STATE_MAX] = { [SERVICE_DEAD] = UNIT_INACTIVE, [SERVICE_CONDITION] = UNIT_ACTIVATING, [SERVICE_START_PRE] = UNIT_ACTIVATING, [SERVICE_START] = UNIT_ACTIVATING, [SERVICE_START_POST] = UNIT_ACTIVATING, [SERVICE_RUNNING] = UNIT_ACTIVE, [SERVICE_EXITED] = UNIT_ACTIVE, [SERVICE_RELOAD] = UNIT_RELOADING, [SERVICE_STOP] = UNIT_DEACTIVATING, [SERVICE_STOP_WATCHDOG] = UNIT_DEACTIVATING, [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING, [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING, [SERVICE_STOP_POST] = UNIT_DEACTIVATING, [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING, [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING, [SERVICE_FAILED] = UNIT_FAILED, [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING, [SERVICE_CLEANING] = UNIT_MAINTENANCE, }; /* For Type=idle we never want to delay any other jobs, hence we * consider idle jobs active as soon as we start working on them */ static const UnitActiveState state_translation_table_idle[_SERVICE_STATE_MAX] = { [SERVICE_DEAD] = UNIT_INACTIVE, [SERVICE_CONDITION] = UNIT_ACTIVE, [SERVICE_START_PRE] = UNIT_ACTIVE, [SERVICE_START] = UNIT_ACTIVE, [SERVICE_START_POST] = UNIT_ACTIVE, [SERVICE_RUNNING] = UNIT_ACTIVE, [SERVICE_EXITED] = UNIT_ACTIVE, [SERVICE_RELOAD] = UNIT_RELOADING, [SERVICE_STOP] = UNIT_DEACTIVATING, [SERVICE_STOP_WATCHDOG] = UNIT_DEACTIVATING, [SERVICE_STOP_SIGTERM] = UNIT_DEACTIVATING, [SERVICE_STOP_SIGKILL] = UNIT_DEACTIVATING, [SERVICE_STOP_POST] = UNIT_DEACTIVATING, [SERVICE_FINAL_SIGTERM] = UNIT_DEACTIVATING, [SERVICE_FINAL_SIGKILL] = UNIT_DEACTIVATING, [SERVICE_FAILED] = UNIT_FAILED, [SERVICE_AUTO_RESTART] = UNIT_ACTIVATING, [SERVICE_CLEANING] = UNIT_MAINTENANCE, }; static int service_dispatch_inotify_io(sd_event_source *source, int fd, uint32_t events, void *userdata); static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata); static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata); static int service_dispatch_exec_io(sd_event_source *source, int fd, uint32_t events, void *userdata); static void service_enter_signal(Service *s, ServiceState state, ServiceResult f); static void service_enter_reload_by_notify(Service *s); static void service_init(Unit *u) { Service *s = SERVICE(u); assert(u); assert(u->load_state == UNIT_STUB); s->timeout_start_usec = u->manager->default_timeout_start_usec; s->timeout_stop_usec = u->manager->default_timeout_stop_usec; s->timeout_abort_usec = u->manager->default_timeout_abort_usec; s->timeout_abort_set = u->manager->default_timeout_abort_set; s->restart_usec = u->manager->default_restart_usec; s->runtime_max_usec = USEC_INFINITY; s->type = _SERVICE_TYPE_INVALID; s->socket_fd = -1; s->stdin_fd = s->stdout_fd = s->stderr_fd = -1; s->guess_main_pid = true; s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID; s->exec_context.keyring_mode = MANAGER_IS_SYSTEM(u->manager) ? EXEC_KEYRING_PRIVATE : EXEC_KEYRING_INHERIT; s->watchdog_original_usec = USEC_INFINITY; s->oom_policy = _OOM_POLICY_INVALID; } static void service_unwatch_control_pid(Service *s) { assert(s); if (s->control_pid <= 0) return; unit_unwatch_pid(UNIT(s), s->control_pid); s->control_pid = 0; } static void service_unwatch_main_pid(Service *s) { assert(s); if (s->main_pid <= 0) return; unit_unwatch_pid(UNIT(s), s->main_pid); s->main_pid = 0; } static void service_unwatch_pid_file(Service *s) { if (!s->pid_file_pathspec) return; log_unit_debug(UNIT(s), "Stopping watch for PID file %s", s->pid_file_pathspec->path); path_spec_unwatch(s->pid_file_pathspec); path_spec_done(s->pid_file_pathspec); s->pid_file_pathspec = mfree(s->pid_file_pathspec); } static int service_set_main_pid(Service *s, pid_t pid) { assert(s); if (pid <= 1) return -EINVAL; if (pid == getpid_cached()) return -EINVAL; if (s->main_pid == pid && s->main_pid_known) return 0; if (s->main_pid != pid) { service_unwatch_main_pid(s); exec_status_start(&s->main_exec_status, pid); } s->main_pid = pid; s->main_pid_known = true; s->main_pid_alien = pid_is_my_child(pid) == 0; if (s->main_pid_alien) log_unit_warning(UNIT(s), "Supervising process "PID_FMT" which is not our child. We'll most likely not notice when it exits.", pid); return 0; } void service_close_socket_fd(Service *s) { assert(s); /* Undo the effect of service_set_socket_fd(). */ s->socket_fd = asynchronous_close(s->socket_fd); if (UNIT_ISSET(s->accept_socket)) { socket_connection_unref(SOCKET(UNIT_DEREF(s->accept_socket))); unit_ref_unset(&s->accept_socket); } } static void service_stop_watchdog(Service *s) { assert(s); s->watchdog_event_source = sd_event_source_unref(s->watchdog_event_source); s->watchdog_timestamp = DUAL_TIMESTAMP_NULL; } static usec_t service_get_watchdog_usec(Service *s) { assert(s); if (s->watchdog_override_enable) return s->watchdog_override_usec; return s->watchdog_original_usec; } static void service_start_watchdog(Service *s) { usec_t watchdog_usec; int r; assert(s); watchdog_usec = service_get_watchdog_usec(s); if (IN_SET(watchdog_usec, 0, USEC_INFINITY)) { service_stop_watchdog(s); return; } if (s->watchdog_event_source) { r = sd_event_source_set_time(s->watchdog_event_source, usec_add(s->watchdog_timestamp.monotonic, watchdog_usec)); if (r < 0) { log_unit_warning_errno(UNIT(s), r, "Failed to reset watchdog timer: %m"); return; } r = sd_event_source_set_enabled(s->watchdog_event_source, SD_EVENT_ONESHOT); } else { r = sd_event_add_time( UNIT(s)->manager->event, &s->watchdog_event_source, CLOCK_MONOTONIC, usec_add(s->watchdog_timestamp.monotonic, watchdog_usec), 0, service_dispatch_watchdog, s); if (r < 0) { log_unit_warning_errno(UNIT(s), r, "Failed to add watchdog timer: %m"); return; } (void) sd_event_source_set_description(s->watchdog_event_source, "service-watchdog"); /* Let's process everything else which might be a sign * of living before we consider a service died. */ r = sd_event_source_set_priority(s->watchdog_event_source, SD_EVENT_PRIORITY_IDLE); } if (r < 0) log_unit_warning_errno(UNIT(s), r, "Failed to install watchdog timer: %m"); } static void service_extend_event_source_timeout(Service *s, sd_event_source *source, usec_t extended) { usec_t current; int r; assert(s); /* Extends the specified event source timer to at least the specified time, unless it is already later * anyway. */ if (!source) return; r = sd_event_source_get_time(source, ¤t); if (r < 0) { const char *desc; (void) sd_event_source_get_description(s->timer_event_source, &desc); log_unit_warning_errno(UNIT(s), r, "Failed to retrieve timeout time for event source '%s', ignoring: %m", strna(desc)); return; } if (current >= extended) /* Current timeout is already longer, ignore this. */ return; r = sd_event_source_set_time(source, extended); if (r < 0) { const char *desc; (void) sd_event_source_get_description(s->timer_event_source, &desc); log_unit_warning_errno(UNIT(s), r, "Failed to set timeout time for even source '%s', ignoring %m", strna(desc)); } } static void service_extend_timeout(Service *s, usec_t extend_timeout_usec) { usec_t extended; assert(s); if (IN_SET(extend_timeout_usec, 0, USEC_INFINITY)) return; extended = usec_add(now(CLOCK_MONOTONIC), extend_timeout_usec); service_extend_event_source_timeout(s, s->timer_event_source, extended); service_extend_event_source_timeout(s, s->watchdog_event_source, extended); } static void service_reset_watchdog(Service *s) { assert(s); dual_timestamp_get(&s->watchdog_timestamp); service_start_watchdog(s); } static void service_override_watchdog_timeout(Service *s, usec_t watchdog_override_usec) { assert(s); s->watchdog_override_enable = true; s->watchdog_override_usec = watchdog_override_usec; service_reset_watchdog(s); log_unit_debug(UNIT(s), "watchdog_usec="USEC_FMT, s->watchdog_usec); log_unit_debug(UNIT(s), "watchdog_override_usec="USEC_FMT, s->watchdog_override_usec); } static void service_fd_store_unlink(ServiceFDStore *fs) { if (!fs) return; if (fs->service) { assert(fs->service->n_fd_store > 0); LIST_REMOVE(fd_store, fs->service->fd_store, fs); fs->service->n_fd_store--; } sd_event_source_disable_unref(fs->event_source); free(fs->fdname); safe_close(fs->fd); free(fs); } static void service_release_fd_store(Service *s) { assert(s); if (s->n_keep_fd_store > 0) return; log_unit_debug(UNIT(s), "Releasing all stored fds"); while (s->fd_store) service_fd_store_unlink(s->fd_store); assert(s->n_fd_store == 0); } static void service_release_resources(Unit *u) { Service *s = SERVICE(u); assert(s); if (!s->fd_store && s->stdin_fd < 0 && s->stdout_fd < 0 && s->stderr_fd < 0) return; log_unit_debug(u, "Releasing resources."); s->stdin_fd = safe_close(s->stdin_fd); s->stdout_fd = safe_close(s->stdout_fd); s->stderr_fd = safe_close(s->stderr_fd); service_release_fd_store(s); } static void service_done(Unit *u) { Service *s = SERVICE(u); assert(s); s->pid_file = mfree(s->pid_file); s->status_text = mfree(s->status_text); s->exec_runtime = exec_runtime_unref(s->exec_runtime, false); exec_command_free_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX); s->control_command = NULL; s->main_command = NULL; dynamic_creds_unref(&s->dynamic_creds); exit_status_set_free(&s->restart_prevent_status); exit_status_set_free(&s->restart_force_status); exit_status_set_free(&s->success_status); /* This will leak a process, but at least no memory or any of * our resources */ service_unwatch_main_pid(s); service_unwatch_control_pid(s); service_unwatch_pid_file(s); if (s->bus_name) { unit_unwatch_bus_name(u, s->bus_name); s->bus_name = mfree(s->bus_name); } s->bus_name_owner = mfree(s->bus_name_owner); s->usb_function_descriptors = mfree(s->usb_function_descriptors); s->usb_function_strings = mfree(s->usb_function_strings); service_close_socket_fd(s); s->peer = socket_peer_unref(s->peer); unit_ref_unset(&s->accept_socket); service_stop_watchdog(s); s->timer_event_source = sd_event_source_unref(s->timer_event_source); s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source); service_release_resources(u); } static int on_fd_store_io(sd_event_source *e, int fd, uint32_t revents, void *userdata) { ServiceFDStore *fs = userdata; assert(e); assert(fs); /* If we get either EPOLLHUP or EPOLLERR, it's time to remove this entry from the fd store */ log_unit_debug(UNIT(fs->service), "Received %s on stored fd %d (%s), closing.", revents & EPOLLERR ? "EPOLLERR" : "EPOLLHUP", fs->fd, strna(fs->fdname)); service_fd_store_unlink(fs); return 0; } static int service_add_fd_store(Service *s, int fd, const char *name) { ServiceFDStore *fs; int r; /* fd is always consumed if we return >= 0 */ assert(s); assert(fd >= 0); if (s->n_fd_store >= s->n_fd_store_max) return -EXFULL; /* Our store is full. * Use this errno rather than E[NM]FILE to distinguish from * the case where systemd itself hits the file limit. */ LIST_FOREACH(fd_store, fs, s->fd_store) { r = same_fd(fs->fd, fd); if (r < 0) return r; if (r > 0) { safe_close(fd); return 0; /* fd already included */ } } fs = new0(ServiceFDStore, 1); if (!fs) return -ENOMEM; fs->fd = fd; fs->service = s; fs->fdname = strdup(name ?: "stored"); if (!fs->fdname) { free(fs); return -ENOMEM; } r = sd_event_add_io(UNIT(s)->manager->event, &fs->event_source, fd, 0, on_fd_store_io, fs); if (r < 0 && r != -EPERM) { /* EPERM indicates fds that aren't pollable, which is OK */ free(fs->fdname); free(fs); return r; } else if (r >= 0) (void) sd_event_source_set_description(fs->event_source, "service-fd-store"); LIST_PREPEND(fd_store, s->fd_store, fs); s->n_fd_store++; return 1; /* fd newly stored */ } static int service_add_fd_store_set(Service *s, FDSet *fds, const char *name) { int r; assert(s); while (fdset_size(fds) > 0) { _cleanup_close_ int fd = -1; fd = fdset_steal_first(fds); if (fd < 0) break; r = service_add_fd_store(s, fd, name); if (r == -EXFULL) return log_unit_warning_errno(UNIT(s), r, "Cannot store more fds than FileDescriptorStoreMax=%u, closing remaining.", s->n_fd_store_max); if (r < 0) return log_unit_error_errno(UNIT(s), r, "Failed to add fd to store: %m"); if (r > 0) log_unit_debug(UNIT(s), "Added fd %u (%s) to fd store.", fd, strna(name)); fd = -1; } return 0; } static void service_remove_fd_store(Service *s, const char *name) { ServiceFDStore *fs, *n; assert(s); assert(name); LIST_FOREACH_SAFE(fd_store, fs, n, s->fd_store) { if (!streq(fs->fdname, name)) continue; log_unit_debug(UNIT(s), "Got explicit request to remove fd %i (%s), closing.", fs->fd, name); service_fd_store_unlink(fs); } } static int service_arm_timer(Service *s, usec_t usec) { int r; assert(s); if (s->timer_event_source) { r = sd_event_source_set_time(s->timer_event_source, usec); if (r < 0) return r; return sd_event_source_set_enabled(s->timer_event_source, SD_EVENT_ONESHOT); } if (usec == USEC_INFINITY) return 0; r = sd_event_add_time( UNIT(s)->manager->event, &s->timer_event_source, CLOCK_MONOTONIC, usec, 0, service_dispatch_timer, s); if (r < 0) return r; (void) sd_event_source_set_description(s->timer_event_source, "service-timer"); return 0; } static int service_verify(Service *s) { assert(s); assert(UNIT(s)->load_state == UNIT_LOADED); if (!service_unit_name_is_valid(UNIT(s)->id)) { log_unit_error(UNIT(s), "Service name is invalid or reserved. Refusing."); return -EINVAL; } if (!s->exec_command[SERVICE_EXEC_START] && !s->exec_command[SERVICE_EXEC_STOP] && UNIT(s)->success_action == EMERGENCY_ACTION_NONE) { /* FailureAction= only makes sense if one of the start or stop commands is specified. * SuccessAction= will be executed unconditionally if no commands are specified. Hence, * either a command or SuccessAction= are required. */ log_unit_error(UNIT(s), "Service has no ExecStart=, ExecStop=, or SuccessAction=. Refusing."); return -ENOEXEC; } if (s->type != SERVICE_ONESHOT && !s->exec_command[SERVICE_EXEC_START]) { log_unit_error(UNIT(s), "Service has no ExecStart= setting, which is only allowed for Type=oneshot services. Refusing."); return -ENOEXEC; } if (!s->remain_after_exit && !s->exec_command[SERVICE_EXEC_START] && UNIT(s)->success_action == EMERGENCY_ACTION_NONE) { log_unit_error(UNIT(s), "Service has no ExecStart= and no SuccessAction= settings and does not have RemainAfterExit=yes set. Refusing."); return -ENOEXEC; } if (s->type != SERVICE_ONESHOT && s->exec_command[SERVICE_EXEC_START]->command_next) { log_unit_error(UNIT(s), "Service has more than one ExecStart= setting, which is only allowed for Type=oneshot services. Refusing."); return -ENOEXEC; } if (s->type == SERVICE_ONESHOT && !IN_SET(s->restart, SERVICE_RESTART_NO, SERVICE_RESTART_ON_FAILURE, SERVICE_RESTART_ON_ABNORMAL, SERVICE_RESTART_ON_WATCHDOG, SERVICE_RESTART_ON_ABORT)) { log_unit_error(UNIT(s), "Service has Restart= set to either always or on-success, which isn't allowed for Type=oneshot services. Refusing."); return -ENOEXEC; } if (s->type == SERVICE_ONESHOT && !exit_status_set_is_empty(&s->restart_force_status)) { log_unit_error(UNIT(s), "Service has RestartForceStatus= set, which isn't allowed for Type=oneshot services. Refusing."); return -ENOEXEC; } if (s->type == SERVICE_DBUS && !s->bus_name) { log_unit_error(UNIT(s), "Service is of type D-Bus but no D-Bus service name has been specified. Refusing."); return -ENOEXEC; } if (s->bus_name && s->type != SERVICE_DBUS) log_unit_warning(UNIT(s), "Service has a D-Bus service name specified, but is not of type dbus. Ignoring."); if (s->exec_context.pam_name && !IN_SET(s->kill_context.kill_mode, KILL_CONTROL_GROUP, KILL_MIXED)) { log_unit_error(UNIT(s), "Service has PAM enabled. Kill mode must be set to 'control-group' or 'mixed'. Refusing."); return -ENOEXEC; } if (s->usb_function_descriptors && !s->usb_function_strings) log_unit_warning(UNIT(s), "Service has USBFunctionDescriptors= setting, but no USBFunctionStrings=. Ignoring."); if (!s->usb_function_descriptors && s->usb_function_strings) log_unit_warning(UNIT(s), "Service has USBFunctionStrings= setting, but no USBFunctionDescriptors=. Ignoring."); if (s->runtime_max_usec != USEC_INFINITY && s->type == SERVICE_ONESHOT) log_unit_warning(UNIT(s), "RuntimeMaxSec= has no effect in combination with Type=oneshot. Ignoring."); return 0; } static int service_add_default_dependencies(Service *s) { int r; assert(s); if (!UNIT(s)->default_dependencies) return 0; /* Add a number of automatic dependencies useful for the * majority of services. */ if (MANAGER_IS_SYSTEM(UNIT(s)->manager)) { /* First, pull in the really early boot stuff, and * require it, so that we fail if we can't acquire * it. */ r = unit_add_two_dependencies_by_name(UNIT(s), UNIT_AFTER, UNIT_REQUIRES, SPECIAL_SYSINIT_TARGET, true, UNIT_DEPENDENCY_DEFAULT); if (r < 0) return r; } else { /* In the --user instance there's no sysinit.target, * in that case require basic.target instead. */ r = unit_add_dependency_by_name(UNIT(s), UNIT_REQUIRES, SPECIAL_BASIC_TARGET, true, UNIT_DEPENDENCY_DEFAULT); if (r < 0) return r; } /* Second, if the rest of the base system is in the same * transaction, order us after it, but do not pull it in or * even require it. */ r = unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_BASIC_TARGET, true, UNIT_DEPENDENCY_DEFAULT); if (r < 0) return r; /* Third, add us in for normal shutdown. */ return unit_add_two_dependencies_by_name(UNIT(s), UNIT_BEFORE, UNIT_CONFLICTS, SPECIAL_SHUTDOWN_TARGET, true, UNIT_DEPENDENCY_DEFAULT); } static void service_fix_output(Service *s) { assert(s); /* If nothing has been explicitly configured, patch default output in. If input is socket/tty we avoid this * however, since in that case we want output to default to the same place as we read input from. */ if (s->exec_context.std_error == EXEC_OUTPUT_INHERIT && s->exec_context.std_output == EXEC_OUTPUT_INHERIT && s->exec_context.std_input == EXEC_INPUT_NULL) s->exec_context.std_error = UNIT(s)->manager->default_std_error; if (s->exec_context.std_output == EXEC_OUTPUT_INHERIT && s->exec_context.std_input == EXEC_INPUT_NULL) s->exec_context.std_output = UNIT(s)->manager->default_std_output; if (s->exec_context.std_input == EXEC_INPUT_NULL && s->exec_context.stdin_data_size > 0) s->exec_context.std_input = EXEC_INPUT_DATA; } static int service_setup_bus_name(Service *s) { int r; assert(s); if (!s->bus_name) return 0; r = unit_add_dependency_by_name(UNIT(s), UNIT_REQUIRES, SPECIAL_DBUS_SOCKET, true, UNIT_DEPENDENCY_FILE); if (r < 0) return log_unit_error_errno(UNIT(s), r, "Failed to add dependency on " SPECIAL_DBUS_SOCKET ": %m"); /* We always want to be ordered against dbus.socket if both are in the transaction. */ r = unit_add_dependency_by_name(UNIT(s), UNIT_AFTER, SPECIAL_DBUS_SOCKET, true, UNIT_DEPENDENCY_FILE); if (r < 0) return log_unit_error_errno(UNIT(s), r, "Failed to add dependency on " SPECIAL_DBUS_SOCKET ": %m"); r = unit_watch_bus_name(UNIT(s), s->bus_name); if (r == -EEXIST) return log_unit_error_errno(UNIT(s), r, "Two services allocated for the same bus name %s, refusing operation.", s->bus_name); if (r < 0) return log_unit_error_errno(UNIT(s), r, "Cannot watch bus name %s: %m", s->bus_name); return 0; } static int service_add_extras(Service *s) { int r; assert(s); if (s->type == _SERVICE_TYPE_INVALID) { /* Figure out a type automatically */ if (s->bus_name) s->type = SERVICE_DBUS; else if (s->exec_command[SERVICE_EXEC_START]) s->type = SERVICE_SIMPLE; else s->type = SERVICE_ONESHOT; } /* Oneshot services have disabled start timeout by default */ if (s->type == SERVICE_ONESHOT && !s->start_timeout_defined) s->timeout_start_usec = USEC_INFINITY; service_fix_output(s); r = unit_patch_contexts(UNIT(s)); if (r < 0) return r; r = unit_add_exec_dependencies(UNIT(s), &s->exec_context); if (r < 0) return r; r = unit_set_default_slice(UNIT(s)); if (r < 0) return r; /* If the service needs the notify socket, let's enable it automatically. */ if (s->notify_access == NOTIFY_NONE && (s->type == SERVICE_NOTIFY || s->watchdog_usec > 0 || s->n_fd_store_max > 0)) s->notify_access = NOTIFY_MAIN; /* If no OOM policy was explicitly set, then default to the configure default OOM policy. Except when * delegation is on, in that case it we assume the payload knows better what to do and can process * things in a more focused way. */ if (s->oom_policy < 0) s->oom_policy = s->cgroup_context.delegate ? OOM_CONTINUE : UNIT(s)->manager->default_oom_policy; /* Let the kernel do the killing if that's requested. */ s->cgroup_context.memory_oom_group = s->oom_policy == OOM_KILL; r = service_add_default_dependencies(s); if (r < 0) return r; r = service_setup_bus_name(s); if (r < 0) return r; return 0; } static int service_load(Unit *u) { Service *s = SERVICE(u); int r; r = unit_load_fragment_and_dropin(u, true); if (r < 0) return r; if (u->load_state != UNIT_LOADED) return 0; /* This is a new unit? Then let's add in some extras */ r = service_add_extras(s); if (r < 0) return r; return service_verify(s); } static void service_dump(Unit *u, FILE *f, const char *prefix) { char buf_restart[FORMAT_TIMESPAN_MAX], buf_start[FORMAT_TIMESPAN_MAX], buf_stop[FORMAT_TIMESPAN_MAX], buf_runtime[FORMAT_TIMESPAN_MAX], buf_watchdog[FORMAT_TIMESPAN_MAX], buf_abort[FORMAT_TIMESPAN_MAX]; ServiceExecCommand c; Service *s = SERVICE(u); const char *prefix2; assert(s); prefix = strempty(prefix); prefix2 = strjoina(prefix, "\t"); fprintf(f, "%sService State: %s\n" "%sResult: %s\n" "%sReload Result: %s\n" "%sClean Result: %s\n" "%sPermissionsStartOnly: %s\n" "%sRootDirectoryStartOnly: %s\n" "%sRemainAfterExit: %s\n" "%sGuessMainPID: %s\n" "%sType: %s\n" "%sRestart: %s\n" "%sNotifyAccess: %s\n" "%sNotifyState: %s\n" "%sOOMPolicy: %s\n", prefix, service_state_to_string(s->state), prefix, service_result_to_string(s->result), prefix, service_result_to_string(s->reload_result), prefix, service_result_to_string(s->clean_result), prefix, yes_no(s->permissions_start_only), prefix, yes_no(s->root_directory_start_only), prefix, yes_no(s->remain_after_exit), prefix, yes_no(s->guess_main_pid), prefix, service_type_to_string(s->type), prefix, service_restart_to_string(s->restart), prefix, notify_access_to_string(s->notify_access), prefix, notify_state_to_string(s->notify_state), prefix, oom_policy_to_string(s->oom_policy)); if (s->control_pid > 0) fprintf(f, "%sControl PID: "PID_FMT"\n", prefix, s->control_pid); if (s->main_pid > 0) fprintf(f, "%sMain PID: "PID_FMT"\n" "%sMain PID Known: %s\n" "%sMain PID Alien: %s\n", prefix, s->main_pid, prefix, yes_no(s->main_pid_known), prefix, yes_no(s->main_pid_alien)); if (s->pid_file) fprintf(f, "%sPIDFile: %s\n", prefix, s->pid_file); if (s->bus_name) fprintf(f, "%sBusName: %s\n" "%sBus Name Good: %s\n", prefix, s->bus_name, prefix, yes_no(s->bus_name_good)); if (UNIT_ISSET(s->accept_socket)) fprintf(f, "%sAccept Socket: %s\n", prefix, UNIT_DEREF(s->accept_socket)->id); fprintf(f, "%sRestartSec: %s\n" "%sTimeoutStartSec: %s\n" "%sTimeoutStopSec: %s\n", prefix, format_timespan(buf_restart, sizeof(buf_restart), s->restart_usec, USEC_PER_SEC), prefix, format_timespan(buf_start, sizeof(buf_start), s->timeout_start_usec, USEC_PER_SEC), prefix, format_timespan(buf_stop, sizeof(buf_stop), s->timeout_stop_usec, USEC_PER_SEC)); if (s->timeout_abort_set) fprintf(f, "%sTimeoutAbortSec: %s\n", prefix, format_timespan(buf_abort, sizeof(buf_abort), s->timeout_abort_usec, USEC_PER_SEC)); fprintf(f, "%sRuntimeMaxSec: %s\n" "%sWatchdogSec: %s\n", prefix, format_timespan(buf_runtime, sizeof(buf_runtime), s->runtime_max_usec, USEC_PER_SEC), prefix, format_timespan(buf_watchdog, sizeof(buf_watchdog), s->watchdog_usec, USEC_PER_SEC)); kill_context_dump(&s->kill_context, f, prefix); exec_context_dump(&s->exec_context, f, prefix); for (c = 0; c < _SERVICE_EXEC_COMMAND_MAX; c++) { if (!s->exec_command[c]) continue; fprintf(f, "%s-> %s:\n", prefix, service_exec_command_to_string(c)); exec_command_dump_list(s->exec_command[c], f, prefix2); } if (s->status_text) fprintf(f, "%sStatus Text: %s\n", prefix, s->status_text); if (s->n_fd_store_max > 0) fprintf(f, "%sFile Descriptor Store Max: %u\n" "%sFile Descriptor Store Current: %zu\n", prefix, s->n_fd_store_max, prefix, s->n_fd_store); cgroup_context_dump(UNIT(s), f, prefix); } static int service_is_suitable_main_pid(Service *s, pid_t pid, int prio) { Unit *owner; assert(s); assert(pid_is_valid(pid)); /* Checks whether the specified PID is suitable as main PID for this service. returns negative if not, 0 if the * PID is questionnable but should be accepted if the source of configuration is trusted. > 0 if the PID is * good */ if (pid == getpid_cached() || pid == 1) { log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" is the manager, refusing.", pid); return -EPERM; } if (pid == s->control_pid) { log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" is the control process, refusing.", pid); return -EPERM; } if (!pid_is_alive(pid)) { log_unit_full(UNIT(s), prio, 0, "New main PID "PID_FMT" does not exist or is a zombie.", pid); return -ESRCH; } owner = manager_get_unit_by_pid(UNIT(s)->manager, pid); if (owner == UNIT(s)) { log_unit_debug(UNIT(s), "New main PID "PID_FMT" belongs to service, we are happy.", pid); return 1; /* Yay, it's definitely a good PID */ } return 0; /* Hmm it's a suspicious PID, let's accept it if configuration source is trusted */ } static int service_load_pid_file(Service *s, bool may_warn) { char procfs[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)]; bool questionable_pid_file = false; _cleanup_free_ char *k = NULL; _cleanup_close_ int fd = -1; int r, prio; pid_t pid; assert(s); if (!s->pid_file) return -ENOENT; prio = may_warn ? LOG_INFO : LOG_DEBUG; fd = chase_symlinks(s->pid_file, NULL, CHASE_OPEN|CHASE_SAFE, NULL); if (fd == -ENOLINK) { log_unit_full(UNIT(s), LOG_DEBUG, fd, "Potentially unsafe symlink chain, will now retry with relaxed checks: %s", s->pid_file); questionable_pid_file = true; fd = chase_symlinks(s->pid_file, NULL, CHASE_OPEN, NULL); } if (fd < 0) return log_unit_full(UNIT(s), prio, fd, "Can't open PID file %s (yet?) after %s: %m", s->pid_file, service_state_to_string(s->state)); /* Let's read the PID file now that we chased it down. But we need to convert the O_PATH fd chase_symlinks() returned us into a proper fd first. */ xsprintf(procfs, "/proc/self/fd/%i", fd); r = read_one_line_file(procfs, &k); if (r < 0) return log_unit_error_errno(UNIT(s), r, "Can't convert PID files %s O_PATH file descriptor to proper file descriptor: %m", s->pid_file); r = parse_pid(k, &pid); if (r < 0) return log_unit_full(UNIT(s), prio, r, "Failed to parse PID from file %s: %m", s->pid_file); if (s->main_pid_known && pid == s->main_pid) return 0; r = service_is_suitable_main_pid(s, pid, prio); if (r < 0) return r; if (r == 0) { struct stat st; if (questionable_pid_file) { log_unit_error(UNIT(s), "Refusing to accept PID outside of service control group, acquired through unsafe symlink chain: %s", s->pid_file); return -EPERM; } /* Hmm, it's not clear if the new main PID is safe. Let's allow this if the PID file is owned by root */ if (fstat(fd, &st) < 0) return log_unit_error_errno(UNIT(s), errno, "Failed to fstat() PID file O_PATH fd: %m"); if (st.st_uid != 0) { log_unit_error(UNIT(s), "New main PID "PID_FMT" does not belong to service, and PID file is not owned by root. Refusing.", pid); return -EPERM; } log_unit_debug(UNIT(s), "New main PID "PID_FMT" does not belong to service, but we'll accept it since PID file is owned by root.", pid); } if (s->main_pid_known) { log_unit_debug(UNIT(s), "Main PID changing: "PID_FMT" -> "PID_FMT, s->main_pid, pid); service_unwatch_main_pid(s); s->main_pid_known = false; } else log_unit_debug(UNIT(s), "Main PID loaded: "PID_FMT, pid); r = service_set_main_pid(s, pid); if (r < 0) return r; r = unit_watch_pid(UNIT(s), pid, false); if (r < 0) /* FIXME: we need to do something here */ return log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" for service: %m", pid); return 1; } static void service_search_main_pid(Service *s) { pid_t pid = 0; int r; assert(s); /* If we know it anyway, don't ever fallback to unreliable * heuristics */ if (s->main_pid_known) return; if (!s->guess_main_pid) return; assert(s->main_pid <= 0); if (unit_search_main_pid(UNIT(s), &pid) < 0) return; log_unit_debug(UNIT(s), "Main PID guessed: "PID_FMT, pid); if (service_set_main_pid(s, pid) < 0) return; r = unit_watch_pid(UNIT(s), pid, false); if (r < 0) /* FIXME: we need to do something here */ log_unit_warning_errno(UNIT(s), r, "Failed to watch PID "PID_FMT" from: %m", pid); } static void service_set_state(Service *s, ServiceState state) { ServiceState old_state; const UnitActiveState *table; assert(s); if (s->state != state) bus_unit_send_pending_change_signal(UNIT(s), false); table = s->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table; old_state = s->state; s->state = state; service_unwatch_pid_file(s); if (!IN_SET(state, SERVICE_CONDITION, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, SERVICE_AUTO_RESTART, SERVICE_CLEANING)) s->timer_event_source = sd_event_source_unref(s->timer_event_source); if (!IN_SET(state, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) { service_unwatch_main_pid(s); s->main_command = NULL; } if (!IN_SET(state, SERVICE_CONDITION, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, SERVICE_CLEANING)) { service_unwatch_control_pid(s); s->control_command = NULL; s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID; } if (IN_SET(state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) { unit_unwatch_all_pids(UNIT(s)); unit_dequeue_rewatch_pids(UNIT(s)); } if (!IN_SET(state, SERVICE_CONDITION, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL) && !(state == SERVICE_DEAD && UNIT(s)->job)) service_close_socket_fd(s); if (state != SERVICE_START) s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source); if (!IN_SET(state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) service_stop_watchdog(s); /* For the inactive states unit_notify() will trim the cgroup, * but for exit we have to do that ourselves... */ if (state == SERVICE_EXITED && !MANAGER_IS_RELOADING(UNIT(s)->manager)) unit_prune_cgroup(UNIT(s)); if (old_state != state) log_unit_debug(UNIT(s), "Changed %s -> %s", service_state_to_string(old_state), service_state_to_string(state)); unit_notify(UNIT(s), table[old_state], table[state], (s->reload_result == SERVICE_SUCCESS ? 0 : UNIT_NOTIFY_RELOAD_FAILURE) | (s->will_auto_restart ? UNIT_NOTIFY_WILL_AUTO_RESTART : 0) | (s->result == SERVICE_SKIP_CONDITION ? UNIT_NOTIFY_SKIP_CONDITION : 0)); } static usec_t service_coldplug_timeout(Service *s) { assert(s); switch (s->deserialized_state) { case SERVICE_CONDITION: case SERVICE_START_PRE: case SERVICE_START: case SERVICE_START_POST: case SERVICE_RELOAD: return usec_add(UNIT(s)->state_change_timestamp.monotonic, s->timeout_start_usec); case SERVICE_RUNNING: return usec_add(UNIT(s)->active_enter_timestamp.monotonic, s->runtime_max_usec); case SERVICE_STOP: case SERVICE_STOP_SIGTERM: case SERVICE_STOP_SIGKILL: case SERVICE_STOP_POST: case SERVICE_FINAL_SIGTERM: case SERVICE_FINAL_SIGKILL: return usec_add(UNIT(s)->state_change_timestamp.monotonic, s->timeout_stop_usec); case SERVICE_STOP_WATCHDOG: return usec_add(UNIT(s)->state_change_timestamp.monotonic, service_timeout_abort_usec(s)); case SERVICE_AUTO_RESTART: return usec_add(UNIT(s)->inactive_enter_timestamp.monotonic, s->restart_usec); case SERVICE_CLEANING: return usec_add(UNIT(s)->state_change_timestamp.monotonic, s->exec_context.timeout_clean_usec); default: return USEC_INFINITY; } } static int service_coldplug(Unit *u) { Service *s = SERVICE(u); int r; assert(s); assert(s->state == SERVICE_DEAD); if (s->deserialized_state == s->state) return 0; r = service_arm_timer(s, service_coldplug_timeout(s)); if (r < 0) return r; if (s->main_pid > 0 && pid_is_unwaited(s->main_pid) && (IN_SET(s->deserialized_state, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL))) { r = unit_watch_pid(UNIT(s), s->main_pid, false); if (r < 0) return r; } if (s->control_pid > 0 && pid_is_unwaited(s->control_pid) && IN_SET(s->deserialized_state, SERVICE_CONDITION, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, SERVICE_CLEANING)) { r = unit_watch_pid(UNIT(s), s->control_pid, false); if (r < 0) return r; } if (!IN_SET(s->deserialized_state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART, SERVICE_CLEANING)) { (void) unit_enqueue_rewatch_pids(u); (void) unit_setup_dynamic_creds(u); (void) unit_setup_exec_runtime(u); } if (IN_SET(s->deserialized_state, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) service_start_watchdog(s); if (UNIT_ISSET(s->accept_socket)) { Socket* socket = SOCKET(UNIT_DEREF(s->accept_socket)); if (socket->max_connections_per_source > 0) { SocketPeer *peer; /* Make a best-effort attempt at bumping the connection count */ if (socket_acquire_peer(socket, s->socket_fd, &peer) > 0) { socket_peer_unref(s->peer); s->peer = peer; } } } service_set_state(s, s->deserialized_state); return 0; } static int service_collect_fds( Service *s, int **fds, char ***fd_names, size_t *n_socket_fds, size_t *n_storage_fds) { _cleanup_strv_free_ char **rfd_names = NULL; _cleanup_free_ int *rfds = NULL; size_t rn_socket_fds = 0, rn_storage_fds = 0; int r; assert(s); assert(fds); assert(fd_names); assert(n_socket_fds); assert(n_storage_fds); if (s->socket_fd >= 0) { /* Pass the per-connection socket */ rfds = new(int, 1); if (!rfds) return -ENOMEM; rfds[0] = s->socket_fd; rfd_names = strv_new("connection"); if (!rfd_names) return -ENOMEM; rn_socket_fds = 1; } else { Iterator i; void *v; Unit *u; /* Pass all our configured sockets for singleton services */ HASHMAP_FOREACH_KEY(v, u, UNIT(s)->dependencies[UNIT_TRIGGERED_BY], i) { _cleanup_free_ int *cfds = NULL; Socket *sock; int cn_fds; if (u->type != UNIT_SOCKET) continue; sock = SOCKET(u); cn_fds = socket_collect_fds(sock, &cfds); if (cn_fds < 0) return cn_fds; if (cn_fds <= 0) continue; if (!rfds) { rfds = TAKE_PTR(cfds); rn_socket_fds = cn_fds; } else { int *t; t = reallocarray(rfds, rn_socket_fds + cn_fds, sizeof(int)); if (!t) return -ENOMEM; memcpy(t + rn_socket_fds, cfds, cn_fds * sizeof(int)); rfds = t; rn_socket_fds += cn_fds; } r = strv_extend_n(&rfd_names, socket_fdname(sock), cn_fds); if (r < 0) return r; } } if (s->n_fd_store > 0) { ServiceFDStore *fs; size_t n_fds; char **nl; int *t; t = reallocarray(rfds, rn_socket_fds + s->n_fd_store, sizeof(int)); if (!t) return -ENOMEM; rfds = t; nl = reallocarray(rfd_names, rn_socket_fds + s->n_fd_store + 1, sizeof(char *)); if (!nl) return -ENOMEM; rfd_names = nl; n_fds = rn_socket_fds; LIST_FOREACH(fd_store, fs, s->fd_store) { rfds[n_fds] = fs->fd; rfd_names[n_fds] = strdup(strempty(fs->fdname)); if (!rfd_names[n_fds]) return -ENOMEM; rn_storage_fds++; n_fds++; } rfd_names[n_fds] = NULL; } *fds = TAKE_PTR(rfds); *fd_names = TAKE_PTR(rfd_names); *n_socket_fds = rn_socket_fds; *n_storage_fds = rn_storage_fds; return 0; } static int service_allocate_exec_fd_event_source( Service *s, int fd, sd_event_source **ret_event_source) { _cleanup_(sd_event_source_unrefp) sd_event_source *source = NULL; int r; assert(s); assert(fd >= 0); assert(ret_event_source); r = sd_event_add_io(UNIT(s)->manager->event, &source, fd, 0, service_dispatch_exec_io, s); if (r < 0) return log_unit_error_errno(UNIT(s), r, "Failed to allocate exec_fd event source: %m"); /* This is a bit lower priority than SIGCHLD, as that carries a lot more interesting failure information */ r = sd_event_source_set_priority(source, SD_EVENT_PRIORITY_NORMAL-3); if (r < 0) return log_unit_error_errno(UNIT(s), r, "Failed to adjust priority of exec_fd event source: %m"); (void) sd_event_source_set_description(source, "service event_fd"); r = sd_event_source_set_io_fd_own(source, true); if (r < 0) return log_unit_error_errno(UNIT(s), r, "Failed to pass ownership of fd to event source: %m"); *ret_event_source = TAKE_PTR(source); return 0; } static int service_allocate_exec_fd( Service *s, sd_event_source **ret_event_source, int* ret_exec_fd) { _cleanup_close_pair_ int p[2] = { -1, -1 }; int r; assert(s); assert(ret_event_source); assert(ret_exec_fd); if (pipe2(p, O_CLOEXEC|O_NONBLOCK) < 0) return log_unit_error_errno(UNIT(s), errno, "Failed to allocate exec_fd pipe: %m"); r = service_allocate_exec_fd_event_source(s, p[0], ret_event_source); if (r < 0) return r; p[0] = -1; *ret_exec_fd = TAKE_FD(p[1]); return 0; } static bool service_exec_needs_notify_socket(Service *s, ExecFlags flags) { assert(s); /* Notifications are accepted depending on the process and * the access setting of the service: * process: \ access: NONE MAIN EXEC ALL * main no yes yes yes * control no no yes yes * other (forked) no no no yes */ if (flags & EXEC_IS_CONTROL) /* A control process */ return IN_SET(s->notify_access, NOTIFY_EXEC, NOTIFY_ALL); /* We only spawn main processes and control processes, so any * process that is not a control process is a main process */ return s->notify_access != NOTIFY_NONE; } static int service_spawn( Service *s, ExecCommand *c, usec_t timeout, ExecFlags flags, pid_t *_pid) { _cleanup_(exec_params_clear) ExecParameters exec_params = { .flags = flags, .stdin_fd = -1, .stdout_fd = -1, .stderr_fd = -1, .exec_fd = -1, }; _cleanup_strv_free_ char **final_env = NULL, **our_env = NULL, **fd_names = NULL; _cleanup_(sd_event_source_unrefp) sd_event_source *exec_fd_source = NULL; size_t n_socket_fds = 0, n_storage_fds = 0, n_env = 0; _cleanup_close_ int exec_fd = -1; _cleanup_free_ int *fds = NULL; pid_t pid; int r; assert(s); assert(c); assert(_pid); r = unit_prepare_exec(UNIT(s)); /* This realizes the cgroup, among other things */ if (r < 0) return r; if (flags & EXEC_IS_CONTROL) { /* If this is a control process, mask the permissions/chroot application if this is requested. */ if (s->permissions_start_only) exec_params.flags &= ~EXEC_APPLY_SANDBOXING; if (s->root_directory_start_only) exec_params.flags &= ~EXEC_APPLY_CHROOT; } if ((flags & EXEC_PASS_FDS) || s->exec_context.std_input == EXEC_INPUT_SOCKET || s->exec_context.std_output == EXEC_OUTPUT_SOCKET || s->exec_context.std_error == EXEC_OUTPUT_SOCKET) { r = service_collect_fds(s, &fds, &fd_names, &n_socket_fds, &n_storage_fds); if (r < 0) return r; log_unit_debug(UNIT(s), "Passing %zu fds to service", n_socket_fds + n_storage_fds); } if (!FLAGS_SET(flags, EXEC_IS_CONTROL) && s->type == SERVICE_EXEC) { assert(!s->exec_fd_event_source); r = service_allocate_exec_fd(s, &exec_fd_source, &exec_fd); if (r < 0) return r; } r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), timeout)); if (r < 0) return r; our_env = new0(char*, 10); if (!our_env) return -ENOMEM; if (service_exec_needs_notify_socket(s, flags)) if (asprintf(our_env + n_env++, "NOTIFY_SOCKET=%s", UNIT(s)->manager->notify_socket) < 0) return -ENOMEM; if (s->main_pid > 0) if (asprintf(our_env + n_env++, "MAINPID="PID_FMT, s->main_pid) < 0) return -ENOMEM; if (MANAGER_IS_USER(UNIT(s)->manager)) if (asprintf(our_env + n_env++, "MANAGERPID="PID_FMT, getpid_cached()) < 0) return -ENOMEM; if (s->pid_file) if (asprintf(our_env + n_env++, "PIDFILE=%s", s->pid_file) < 0) return -ENOMEM; if (s->socket_fd >= 0) { union sockaddr_union sa; socklen_t salen = sizeof(sa); /* If this is a per-connection service instance, let's set $REMOTE_ADDR and $REMOTE_PORT to something * useful. Note that we do this only when we are still connected at this point in time, which we might * very well not be. Hence we ignore all errors when retrieving peer information (as that might result * in ENOTCONN), and just use whate we can use. */ if (getpeername(s->socket_fd, &sa.sa, &salen) >= 0 && IN_SET(sa.sa.sa_family, AF_INET, AF_INET6, AF_VSOCK)) { _cleanup_free_ char *addr = NULL; char *t; unsigned port; r = sockaddr_pretty(&sa.sa, salen, true, false, &addr); if (r < 0) return r; t = strjoin("REMOTE_ADDR=", addr); if (!t) return -ENOMEM; our_env[n_env++] = t; r = sockaddr_port(&sa.sa, &port); if (r < 0) return r; if (asprintf(&t, "REMOTE_PORT=%u", port) < 0) return -ENOMEM; our_env[n_env++] = t; } } if (flags & EXEC_SETENV_RESULT) { if (asprintf(our_env + n_env++, "SERVICE_RESULT=%s", service_result_to_string(s->result)) < 0) return -ENOMEM; if (s->main_exec_status.pid > 0 && dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) { if (asprintf(our_env + n_env++, "EXIT_CODE=%s", sigchld_code_to_string(s->main_exec_status.code)) < 0) return -ENOMEM; if (s->main_exec_status.code == CLD_EXITED) r = asprintf(our_env + n_env++, "EXIT_STATUS=%i", s->main_exec_status.status); else r = asprintf(our_env + n_env++, "EXIT_STATUS=%s", signal_to_string(s->main_exec_status.status)); if (r < 0) return -ENOMEM; } } r = unit_set_exec_params(UNIT(s), &exec_params); if (r < 0) return r; final_env = strv_env_merge(2, exec_params.environment, our_env, NULL); if (!final_env) return -ENOMEM; /* System D-Bus needs nss-systemd disabled, so that we don't deadlock */ SET_FLAG(exec_params.flags, EXEC_NSS_BYPASS_BUS, MANAGER_IS_SYSTEM(UNIT(s)->manager) && unit_has_name(UNIT(s), SPECIAL_DBUS_SERVICE)); strv_free_and_replace(exec_params.environment, final_env); exec_params.fds = fds; exec_params.fd_names = fd_names; exec_params.n_socket_fds = n_socket_fds; exec_params.n_storage_fds = n_storage_fds; exec_params.watchdog_usec = service_get_watchdog_usec(s); exec_params.selinux_context_net = s->socket_fd_selinux_context_net; if (s->type == SERVICE_IDLE) exec_params.idle_pipe = UNIT(s)->manager->idle_pipe; exec_params.stdin_fd = s->stdin_fd; exec_params.stdout_fd = s->stdout_fd; exec_params.stderr_fd = s->stderr_fd; exec_params.exec_fd = exec_fd; r = exec_spawn(UNIT(s), c, &s->exec_context, &exec_params, s->exec_runtime, &s->dynamic_creds, &pid); if (r < 0) return r; s->exec_fd_event_source = TAKE_PTR(exec_fd_source); s->exec_fd_hot = false; r = unit_watch_pid(UNIT(s), pid, true); if (r < 0) return r; *_pid = pid; return 0; } static int main_pid_good(Service *s) { assert(s); /* Returns 0 if the pid is dead, > 0 if it is good, < 0 if we don't know */ /* If we know the pid file, then let's just check if it is * still valid */ if (s->main_pid_known) { /* If it's an alien child let's check if it is still * alive ... */ if (s->main_pid_alien && s->main_pid > 0) return pid_is_alive(s->main_pid); /* .. otherwise assume we'll get a SIGCHLD for it, * which we really should wait for to collect exit * status and code */ return s->main_pid > 0; } /* We don't know the pid */ return -EAGAIN; } static int control_pid_good(Service *s) { assert(s); /* Returns 0 if the control PID is dead, > 0 if it is good. We never actually return < 0 here, but in order to * make this function as similar as possible to main_pid_good() and cgroup_good(), we pretend that < 0 also * means: we can't figure it out. */ return s->control_pid > 0; } static int cgroup_good(Service *s) { int r; assert(s); /* Returns 0 if the cgroup is empty or doesn't exist, > 0 if it is exists and is populated, < 0 if we can't * figure it out */ if (!UNIT(s)->cgroup_path) return 0; r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, UNIT(s)->cgroup_path); if (r < 0) return r; return r == 0; } static bool service_shall_restart(Service *s) { assert(s); /* Don't restart after manual stops */ if (s->forbid_restart) return false; /* Never restart if this is configured as special exception */ if (exit_status_set_test(&s->restart_prevent_status, s->main_exec_status.code, s->main_exec_status.status)) return false; /* Restart if the exit code/status are configured as restart triggers */ if (exit_status_set_test(&s->restart_force_status, s->main_exec_status.code, s->main_exec_status.status)) return true; switch (s->restart) { case SERVICE_RESTART_NO: return false; case SERVICE_RESTART_ALWAYS: return true; case SERVICE_RESTART_ON_SUCCESS: return s->result == SERVICE_SUCCESS; case SERVICE_RESTART_ON_FAILURE: return s->result != SERVICE_SUCCESS; case SERVICE_RESTART_ON_ABNORMAL: return !IN_SET(s->result, SERVICE_SUCCESS, SERVICE_FAILURE_EXIT_CODE); case SERVICE_RESTART_ON_WATCHDOG: return s->result == SERVICE_FAILURE_WATCHDOG; case SERVICE_RESTART_ON_ABORT: return IN_SET(s->result, SERVICE_FAILURE_SIGNAL, SERVICE_FAILURE_CORE_DUMP); default: assert_not_reached("unknown restart setting"); } } static bool service_will_restart(Unit *u) { Service *s = SERVICE(u); assert(s); if (s->will_auto_restart) return true; if (s->state == SERVICE_AUTO_RESTART) return true; return unit_will_restart_default(u); } static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart) { ServiceState end_state; int r; assert(s); /* If there's a stop job queued before we enter the DEAD state, we shouldn't act on Restart=, in order to not * undo what has already been enqueued. */ if (unit_stop_pending(UNIT(s))) allow_restart = false; if (s->result == SERVICE_SUCCESS) s->result = f; if (s->result == SERVICE_SUCCESS) { unit_log_success(UNIT(s)); end_state = SERVICE_DEAD; } else if (s->result == SERVICE_SKIP_CONDITION) { unit_log_skip(UNIT(s), service_result_to_string(s->result)); end_state = SERVICE_DEAD; } else { unit_log_failure(UNIT(s), service_result_to_string(s->result)); end_state = SERVICE_FAILED; } if (allow_restart && service_shall_restart(s)) s->will_auto_restart = true; /* Make sure service_release_resources() doesn't destroy our FD store, while we are changing through * SERVICE_FAILED/SERVICE_DEAD before entering into SERVICE_AUTO_RESTART. */ s->n_keep_fd_store ++; service_set_state(s, end_state); if (s->will_auto_restart) { s->will_auto_restart = false; r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->restart_usec)); if (r < 0) { s->n_keep_fd_store--; goto fail; } service_set_state(s, SERVICE_AUTO_RESTART); } else /* If we shan't restart, then flush out the restart counter. But don't do that immediately, so that the * user can still introspect the counter. Do so on the next start. */ s->flush_n_restarts = true; /* The new state is in effect, let's decrease the fd store ref counter again. Let's also re-add us to the GC * queue, so that the fd store is possibly gc'ed again */ s->n_keep_fd_store--; unit_add_to_gc_queue(UNIT(s)); /* The next restart might not be a manual stop, hence reset the flag indicating manual stops */ s->forbid_restart = false; /* We want fresh tmpdirs in case service is started again immediately */ s->exec_runtime = exec_runtime_unref(s->exec_runtime, true); /* Also, remove the runtime directory */ unit_destroy_runtime_directory(UNIT(s), &s->exec_context); /* Get rid of the IPC bits of the user */ unit_unref_uid_gid(UNIT(s), true); /* Release the user, and destroy it if we are the only remaining owner */ dynamic_creds_destroy(&s->dynamic_creds); /* Try to delete the pid file. At this point it will be * out-of-date, and some software might be confused by it, so * let's remove it. */ if (s->pid_file) (void) unlink(s->pid_file); /* Reset TTY ownership if necessary */ exec_context_revert_tty(&s->exec_context); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run install restart timer: %m"); service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false); } static void service_enter_stop_post(Service *s, ServiceResult f) { int r; assert(s); if (s->result == SERVICE_SUCCESS) s->result = f; service_unwatch_control_pid(s); (void) unit_enqueue_rewatch_pids(UNIT(s)); s->control_command = s->exec_command[SERVICE_EXEC_STOP_POST]; if (s->control_command) { s->control_command_id = SERVICE_EXEC_STOP_POST; r = service_spawn(s, s->control_command, s->timeout_stop_usec, EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_IS_CONTROL|EXEC_SETENV_RESULT|EXEC_CONTROL_CGROUP, &s->control_pid); if (r < 0) goto fail; service_set_state(s, SERVICE_STOP_POST); } else service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_SUCCESS); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop-post' task: %m"); service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_RESOURCES); } static int state_to_kill_operation(Service *s, ServiceState state) { switch (state) { case SERVICE_STOP_WATCHDOG: return KILL_WATCHDOG; case SERVICE_STOP_SIGTERM: if (unit_has_job_type(UNIT(s), JOB_RESTART)) return KILL_RESTART; _fallthrough_; case SERVICE_FINAL_SIGTERM: return KILL_TERMINATE; case SERVICE_STOP_SIGKILL: case SERVICE_FINAL_SIGKILL: return KILL_KILL; default: return _KILL_OPERATION_INVALID; } } static void service_enter_signal(Service *s, ServiceState state, ServiceResult f) { int r; assert(s); if (s->result == SERVICE_SUCCESS) s->result = f; /* Before sending any signal, make sure we track all members of this cgroup */ (void) unit_watch_all_pids(UNIT(s)); /* Also, enqueue a job that we recheck all our PIDs a bit later, given that it's likely some processes have * died now */ (void) unit_enqueue_rewatch_pids(UNIT(s)); r = unit_kill_context( UNIT(s), &s->kill_context, state_to_kill_operation(s, state), s->main_pid, s->control_pid, s->main_pid_alien); if (r < 0) goto fail; if (r > 0) { r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), state == SERVICE_STOP_WATCHDOG ? service_timeout_abort_usec(s) : s->timeout_stop_usec)); if (r < 0) goto fail; service_set_state(s, state); } else if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM) && s->kill_context.send_sigkill) service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_SUCCESS); else if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL)) service_enter_stop_post(s, SERVICE_SUCCESS); else if (state == SERVICE_FINAL_SIGTERM && s->kill_context.send_sigkill) service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_SUCCESS); else service_enter_dead(s, SERVICE_SUCCESS, true); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to kill processes: %m"); if (IN_SET(state, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL)) service_enter_stop_post(s, SERVICE_FAILURE_RESOURCES); else service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true); } static void service_enter_stop_by_notify(Service *s) { assert(s); (void) unit_enqueue_rewatch_pids(UNIT(s)); service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_stop_usec)); /* The service told us it's stopping, so it's as if we SIGTERM'd it. */ service_set_state(s, SERVICE_STOP_SIGTERM); } static void service_enter_stop(Service *s, ServiceResult f) { int r; assert(s); if (s->result == SERVICE_SUCCESS) s->result = f; service_unwatch_control_pid(s); (void) unit_enqueue_rewatch_pids(UNIT(s)); s->control_command = s->exec_command[SERVICE_EXEC_STOP]; if (s->control_command) { s->control_command_id = SERVICE_EXEC_STOP; r = service_spawn(s, s->control_command, s->timeout_stop_usec, EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_SETENV_RESULT|EXEC_CONTROL_CGROUP, &s->control_pid); if (r < 0) goto fail; service_set_state(s, SERVICE_STOP); } else service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'stop' task: %m"); service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES); } static bool service_good(Service *s) { int main_pid_ok; assert(s); if (s->type == SERVICE_DBUS && !s->bus_name_good) return false; main_pid_ok = main_pid_good(s); if (main_pid_ok > 0) /* It's alive */ return true; if (main_pid_ok == 0) /* It's dead */ return false; /* OK, we don't know anything about the main PID, maybe * because there is none. Let's check the control group * instead. */ return cgroup_good(s) != 0; } static void service_enter_running(Service *s, ServiceResult f) { assert(s); if (s->result == SERVICE_SUCCESS) s->result = f; service_unwatch_control_pid(s); if (s->result != SERVICE_SUCCESS) service_enter_signal(s, SERVICE_STOP_SIGTERM, f); else if (service_good(s)) { /* If there are any queued up sd_notify() notifications, process them now */ if (s->notify_state == NOTIFY_RELOADING) service_enter_reload_by_notify(s); else if (s->notify_state == NOTIFY_STOPPING) service_enter_stop_by_notify(s); else { service_set_state(s, SERVICE_RUNNING); service_arm_timer(s, usec_add(UNIT(s)->active_enter_timestamp.monotonic, s->runtime_max_usec)); } } else if (s->remain_after_exit) service_set_state(s, SERVICE_EXITED); else service_enter_stop(s, SERVICE_SUCCESS); } static void service_enter_start_post(Service *s) { int r; assert(s); service_unwatch_control_pid(s); service_reset_watchdog(s); s->control_command = s->exec_command[SERVICE_EXEC_START_POST]; if (s->control_command) { s->control_command_id = SERVICE_EXEC_START_POST; r = service_spawn(s, s->control_command, s->timeout_start_usec, EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_CONTROL_CGROUP, &s->control_pid); if (r < 0) goto fail; service_set_state(s, SERVICE_START_POST); } else service_enter_running(s, SERVICE_SUCCESS); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-post' task: %m"); service_enter_stop(s, SERVICE_FAILURE_RESOURCES); } static void service_kill_control_process(Service *s) { int r; assert(s); if (s->control_pid <= 0) return; r = kill_and_sigcont(s->control_pid, SIGKILL); if (r < 0) { _cleanup_free_ char *comm = NULL; (void) get_process_comm(s->control_pid, &comm); log_unit_debug_errno(UNIT(s), r, "Failed to kill control process " PID_FMT " (%s), ignoring: %m", s->control_pid, strna(comm)); } } static int service_adverse_to_leftover_processes(Service *s) { assert(s); /* KillMode=mixed and control group are used to indicate that all process should be killed off. * SendSIGKILL is used for services that require a clean shutdown. These are typically database * service where a SigKilled process would result in a lengthy recovery and who's shutdown or * startup time is quite variable (so Timeout settings aren't of use). * * Here we take these two factors and refuse to start a service if there are existing processes * within a control group. Databases, while generally having some protection against multiple * instances running, lets not stress the rigor of these. Also ExecStartPre parts of the service * aren't as rigoriously written to protect aganst against multiple use. */ if (unit_warn_leftover_processes(UNIT(s)) && IN_SET(s->kill_context.kill_mode, KILL_MIXED, KILL_CONTROL_GROUP) && !s->kill_context.send_sigkill) return log_unit_error_errno(UNIT(s), SYNTHETIC_ERRNO(EBUSY), "Will not start SendSIGKILL=no service of type KillMode=control-group or mixed while processes exist"); return 0; } static void service_enter_start(Service *s) { ExecCommand *c; usec_t timeout; pid_t pid; int r; assert(s); service_unwatch_control_pid(s); service_unwatch_main_pid(s); r = service_adverse_to_leftover_processes(s); if (r < 0) goto fail; if (s->type == SERVICE_FORKING) { s->control_command_id = SERVICE_EXEC_START; c = s->control_command = s->exec_command[SERVICE_EXEC_START]; s->main_command = NULL; } else { s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID; s->control_command = NULL; c = s->main_command = s->exec_command[SERVICE_EXEC_START]; } if (!c) { if (s->type != SERVICE_ONESHOT) { /* There's no command line configured for the main command? Hmm, that is strange. This can only * happen if the configuration changes at runtime. In this case, let's enter a failure * state. */ log_unit_error(UNIT(s), "There's no 'start' task anymore we could start."); r = -ENXIO; goto fail; } /* We force a fake state transition here. Otherwise, the unit would go directly from * SERVICE_DEAD to SERVICE_DEAD without SERVICE_ACTIVATING or SERVICE_ACTIVE * in between. This way we can later trigger actions that depend on the state * transition, including SuccessAction=. */ service_set_state(s, SERVICE_START); service_enter_start_post(s); return; } if (IN_SET(s->type, SERVICE_SIMPLE, SERVICE_IDLE)) /* For simple + idle this is the main process. We don't apply any timeout here, but * service_enter_running() will later apply the .runtime_max_usec timeout. */ timeout = USEC_INFINITY; else timeout = s->timeout_start_usec; r = service_spawn(s, c, timeout, EXEC_PASS_FDS|EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_SET_WATCHDOG, &pid); if (r < 0) goto fail; if (IN_SET(s->type, SERVICE_SIMPLE, SERVICE_IDLE)) { /* For simple services we immediately start * the START_POST binaries. */ service_set_main_pid(s, pid); service_enter_start_post(s); } else if (s->type == SERVICE_FORKING) { /* For forking services we wait until the start * process exited. */ s->control_pid = pid; service_set_state(s, SERVICE_START); } else if (IN_SET(s->type, SERVICE_ONESHOT, SERVICE_DBUS, SERVICE_NOTIFY, SERVICE_EXEC)) { /* For oneshot services we wait until the start process exited, too, but it is our main process. */ /* For D-Bus services we know the main pid right away, but wait for the bus name to appear on the * bus. 'notify' and 'exec' services are similar. */ service_set_main_pid(s, pid); service_set_state(s, SERVICE_START); } else assert_not_reached("Unknown service type"); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'start' task: %m"); service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES); } static void service_enter_start_pre(Service *s) { int r; assert(s); service_unwatch_control_pid(s); s->control_command = s->exec_command[SERVICE_EXEC_START_PRE]; if (s->control_command) { r = service_adverse_to_leftover_processes(s); if (r < 0) goto fail; s->control_command_id = SERVICE_EXEC_START_PRE; r = service_spawn(s, s->control_command, s->timeout_start_usec, EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_APPLY_TTY_STDIN, &s->control_pid); if (r < 0) goto fail; service_set_state(s, SERVICE_START_PRE); } else service_enter_start(s); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'start-pre' task: %m"); service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true); } static void service_enter_condition(Service *s) { int r; assert(s); service_unwatch_control_pid(s); s->control_command = s->exec_command[SERVICE_EXEC_CONDITION]; if (s->control_command) { r = service_adverse_to_leftover_processes(s); if (r < 0) goto fail; s->control_command_id = SERVICE_EXEC_CONDITION; r = service_spawn(s, s->control_command, s->timeout_start_usec, EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_APPLY_TTY_STDIN, &s->control_pid); if (r < 0) goto fail; service_set_state(s, SERVICE_CONDITION); } else service_enter_start_pre(s); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'exec-condition' task: %m"); service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true); } static void service_enter_restart(Service *s) { _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; int r; assert(s); if (unit_has_job_type(UNIT(s), JOB_STOP)) { /* Don't restart things if we are going down anyway */ log_unit_info(UNIT(s), "Stop job pending for unit, delaying automatic restart."); r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->restart_usec)); if (r < 0) goto fail; return; } /* Any units that are bound to this service must also be * restarted. We use JOB_RESTART (instead of the more obvious * JOB_START) here so that those dependency jobs will be added * as well. */ r = manager_add_job(UNIT(s)->manager, JOB_RESTART, UNIT(s), JOB_REPLACE, NULL, &error, NULL); if (r < 0) goto fail; /* Count the jobs we enqueue for restarting. This counter is maintained as long as the unit isn't fully * stopped, i.e. as long as it remains up or remains in auto-start states. The use can reset the counter * explicitly however via the usual "systemctl reset-failure" logic. */ s->n_restarts ++; s->flush_n_restarts = false; log_struct(LOG_INFO, "MESSAGE_ID=" SD_MESSAGE_UNIT_RESTART_SCHEDULED_STR, LOG_UNIT_ID(UNIT(s)), LOG_UNIT_INVOCATION_ID(UNIT(s)), LOG_UNIT_MESSAGE(UNIT(s), "Scheduled restart job, restart counter is at %u.", s->n_restarts), "N_RESTARTS=%u", s->n_restarts); /* Notify clients about changed restart counter */ unit_add_to_dbus_queue(UNIT(s)); /* Note that we stay in the SERVICE_AUTO_RESTART state here, * it will be canceled as part of the service_stop() call that * is executed as part of JOB_RESTART. */ return; fail: log_unit_warning(UNIT(s), "Failed to schedule restart job: %s", bus_error_message(&error, -r)); service_enter_dead(s, SERVICE_FAILURE_RESOURCES, false); } static void service_enter_reload_by_notify(Service *s) { _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; int r; assert(s); service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->timeout_start_usec)); service_set_state(s, SERVICE_RELOAD); /* service_enter_reload_by_notify is never called during a reload, thus no loops are possible. */ r = manager_propagate_reload(UNIT(s)->manager, UNIT(s), JOB_FAIL, &error); if (r < 0) log_unit_warning(UNIT(s), "Failed to schedule propagation of reload: %s", bus_error_message(&error, -r)); } static void service_enter_reload(Service *s) { int r; assert(s); service_unwatch_control_pid(s); s->reload_result = SERVICE_SUCCESS; s->control_command = s->exec_command[SERVICE_EXEC_RELOAD]; if (s->control_command) { s->control_command_id = SERVICE_EXEC_RELOAD; r = service_spawn(s, s->control_command, s->timeout_start_usec, EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL|EXEC_CONTROL_CGROUP, &s->control_pid); if (r < 0) goto fail; service_set_state(s, SERVICE_RELOAD); } else service_enter_running(s, SERVICE_SUCCESS); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run 'reload' task: %m"); s->reload_result = SERVICE_FAILURE_RESOURCES; service_enter_running(s, SERVICE_SUCCESS); } static void service_run_next_control(Service *s) { usec_t timeout; int r; assert(s); assert(s->control_command); assert(s->control_command->command_next); assert(s->control_command_id != SERVICE_EXEC_START); s->control_command = s->control_command->command_next; service_unwatch_control_pid(s); if (IN_SET(s->state, SERVICE_CONDITION, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) timeout = s->timeout_start_usec; else timeout = s->timeout_stop_usec; r = service_spawn(s, s->control_command, timeout, EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_IS_CONTROL| (IN_SET(s->control_command_id, SERVICE_EXEC_CONDITION, SERVICE_EXEC_START_PRE, SERVICE_EXEC_STOP_POST) ? EXEC_APPLY_TTY_STDIN : 0)| (IN_SET(s->control_command_id, SERVICE_EXEC_STOP, SERVICE_EXEC_STOP_POST) ? EXEC_SETENV_RESULT : 0)| (IN_SET(s->control_command_id, SERVICE_EXEC_START_POST, SERVICE_EXEC_RELOAD, SERVICE_EXEC_STOP, SERVICE_EXEC_STOP_POST) ? EXEC_CONTROL_CGROUP : 0), &s->control_pid); if (r < 0) goto fail; return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run next control task: %m"); if (IN_SET(s->state, SERVICE_CONDITION, SERVICE_START_PRE, SERVICE_START_POST, SERVICE_STOP)) service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES); else if (s->state == SERVICE_STOP_POST) service_enter_dead(s, SERVICE_FAILURE_RESOURCES, true); else if (s->state == SERVICE_RELOAD) { s->reload_result = SERVICE_FAILURE_RESOURCES; service_enter_running(s, SERVICE_SUCCESS); } else service_enter_stop(s, SERVICE_FAILURE_RESOURCES); } static void service_run_next_main(Service *s) { pid_t pid; int r; assert(s); assert(s->main_command); assert(s->main_command->command_next); assert(s->type == SERVICE_ONESHOT); s->main_command = s->main_command->command_next; service_unwatch_main_pid(s); r = service_spawn(s, s->main_command, s->timeout_start_usec, EXEC_PASS_FDS|EXEC_APPLY_SANDBOXING|EXEC_APPLY_CHROOT|EXEC_APPLY_TTY_STDIN|EXEC_SET_WATCHDOG, &pid); if (r < 0) goto fail; service_set_main_pid(s, pid); return; fail: log_unit_warning_errno(UNIT(s), r, "Failed to run next main task: %m"); service_enter_stop(s, SERVICE_FAILURE_RESOURCES); } static int service_start(Unit *u) { Service *s = SERVICE(u); int r; assert(s); /* We cannot fulfill this request right now, try again later * please! */ if (IN_SET(s->state, SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL, SERVICE_CLEANING)) return -EAGAIN; /* Already on it! */ if (IN_SET(s->state, SERVICE_CONDITION, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST)) return 0; /* A service that will be restarted must be stopped first to * trigger BindsTo and/or OnFailure dependencies. If a user * does not want to wait for the holdoff time to elapse, the * service should be manually restarted, not started. We * simply return EAGAIN here, so that any start jobs stay * queued, and assume that the auto restart timer will * eventually trigger the restart. */ if (s->state == SERVICE_AUTO_RESTART) return -EAGAIN; assert(IN_SET(s->state, SERVICE_DEAD, SERVICE_FAILED)); /* Make sure we don't enter a busy loop of some kind. */ r = unit_test_start_limit(u); if (r < 0) { service_enter_dead(s, SERVICE_FAILURE_START_LIMIT_HIT, false); return r; } r = unit_acquire_invocation_id(u); if (r < 0) return r; s->result = SERVICE_SUCCESS; s->reload_result = SERVICE_SUCCESS; s->main_pid_known = false; s->main_pid_alien = false; s->forbid_restart = false; s->status_text = mfree(s->status_text); s->status_errno = 0; s->notify_state = NOTIFY_UNKNOWN; s->watchdog_original_usec = s->watchdog_usec; s->watchdog_override_enable = false; s->watchdog_override_usec = USEC_INFINITY; exec_command_reset_status_list_array(s->exec_command, _SERVICE_EXEC_COMMAND_MAX); exec_status_reset(&s->main_exec_status); /* This is not an automatic restart? Flush the restart counter then */ if (s->flush_n_restarts) { s->n_restarts = 0; s->flush_n_restarts = false; } u->reset_accounting = true; service_enter_condition(s); return 1; } static int service_stop(Unit *u) { Service *s = SERVICE(u); assert(s); /* Don't create restart jobs from manual stops. */ s->forbid_restart = true; /* Already on it */ if (IN_SET(s->state, SERVICE_STOP, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL)) return 0; /* A restart will be scheduled or is in progress. */ if (s->state == SERVICE_AUTO_RESTART) { service_set_state(s, SERVICE_DEAD); return 0; } /* If there's already something running we go directly into * kill mode. */ if (IN_SET(s->state, SERVICE_CONDITION, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD, SERVICE_STOP_WATCHDOG)) { service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_SUCCESS); return 0; } /* If we are currently cleaning, then abort it, brutally. */ if (s->state == SERVICE_CLEANING) { service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_SUCCESS); return 0; } assert(IN_SET(s->state, SERVICE_RUNNING, SERVICE_EXITED)); service_enter_stop(s, SERVICE_SUCCESS); return 1; } static int service_reload(Unit *u) { Service *s = SERVICE(u); assert(s); assert(IN_SET(s->state, SERVICE_RUNNING, SERVICE_EXITED)); service_enter_reload(s); return 1; } _pure_ static bool service_can_reload(Unit *u) { Service *s = SERVICE(u); assert(s); return !!s->exec_command[SERVICE_EXEC_RELOAD]; } static unsigned service_exec_command_index(Unit *u, ServiceExecCommand id, ExecCommand *current) { Service *s = SERVICE(u); unsigned idx = 0; ExecCommand *first, *c; assert(s); first = s->exec_command[id]; /* Figure out where we are in the list by walking back to the beginning */ for (c = current; c != first; c = c->command_prev) idx++; return idx; } static int service_serialize_exec_command(Unit *u, FILE *f, ExecCommand *command) { _cleanup_free_ char *args = NULL, *p = NULL; size_t allocated = 0, length = 0; Service *s = SERVICE(u); const char *type, *key; ServiceExecCommand id; unsigned idx; char **arg; assert(s); assert(f); if (!command) return 0; if (command == s->control_command) { type = "control"; id = s->control_command_id; } else { type = "main"; id = SERVICE_EXEC_START; } idx = service_exec_command_index(u, id, command); STRV_FOREACH(arg, command->argv) { _cleanup_free_ char *e = NULL; size_t n; e = cescape(*arg); if (!e) return log_oom(); n = strlen(e); if (!GREEDY_REALLOC(args, allocated, length + 2 + n + 2)) return log_oom(); if (length > 0) args[length++] = ' '; args[length++] = '"'; memcpy(args + length, e, n); length += n; args[length++] = '"'; } if (!GREEDY_REALLOC(args, allocated, length + 1)) return log_oom(); args[length++] = 0; p = cescape(command->path); if (!p) return -ENOMEM; key = strjoina(type, "-command"); return serialize_item_format(f, key, "%s %u %s %s", service_exec_command_to_string(id), idx, p, args); } static int service_serialize(Unit *u, FILE *f, FDSet *fds) { Service *s = SERVICE(u); ServiceFDStore *fs; int r; assert(u); assert(f); assert(fds); (void) serialize_item(f, "state", service_state_to_string(s->state)); (void) serialize_item(f, "result", service_result_to_string(s->result)); (void) serialize_item(f, "reload-result", service_result_to_string(s->reload_result)); if (s->control_pid > 0) (void) serialize_item_format(f, "control-pid", PID_FMT, s->control_pid); if (s->main_pid_known && s->main_pid > 0) (void) serialize_item_format(f, "main-pid", PID_FMT, s->main_pid); (void) serialize_bool(f, "main-pid-known", s->main_pid_known); (void) serialize_bool(f, "bus-name-good", s->bus_name_good); (void) serialize_bool(f, "bus-name-owner", s->bus_name_owner); (void) serialize_item_format(f, "n-restarts", "%u", s->n_restarts); (void) serialize_bool(f, "flush-n-restarts", s->flush_n_restarts); r = serialize_item_escaped(f, "status-text", s->status_text); if (r < 0) return r; service_serialize_exec_command(u, f, s->control_command); service_serialize_exec_command(u, f, s->main_command); r = serialize_fd(f, fds, "stdin-fd", s->stdin_fd); if (r < 0) return r; r = serialize_fd(f, fds, "stdout-fd", s->stdout_fd); if (r < 0) return r; r = serialize_fd(f, fds, "stderr-fd", s->stderr_fd); if (r < 0) return r; if (s->exec_fd_event_source) { r = serialize_fd(f, fds, "exec-fd", sd_event_source_get_io_fd(s->exec_fd_event_source)); if (r < 0) return r; (void) serialize_bool(f, "exec-fd-hot", s->exec_fd_hot); } if (UNIT_ISSET(s->accept_socket)) { r = serialize_item(f, "accept-socket", UNIT_DEREF(s->accept_socket)->id); if (r < 0) return r; } r = serialize_fd(f, fds, "socket-fd", s->socket_fd); if (r < 0) return r; LIST_FOREACH(fd_store, fs, s->fd_store) { _cleanup_free_ char *c = NULL; int copy; copy = fdset_put_dup(fds, fs->fd); if (copy < 0) return log_error_errno(copy, "Failed to copy file descriptor for serialization: %m"); c = cescape(fs->fdname); if (!c) return log_oom(); (void) serialize_item_format(f, "fd-store-fd", "%i %s", copy, c); } if (s->main_exec_status.pid > 0) { (void) serialize_item_format(f, "main-exec-status-pid", PID_FMT, s->main_exec_status.pid); (void) serialize_dual_timestamp(f, "main-exec-status-start", &s->main_exec_status.start_timestamp); (void) serialize_dual_timestamp(f, "main-exec-status-exit", &s->main_exec_status.exit_timestamp); if (dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) { (void) serialize_item_format(f, "main-exec-status-code", "%i", s->main_exec_status.code); (void) serialize_item_format(f, "main-exec-status-status", "%i", s->main_exec_status.status); } } (void) serialize_dual_timestamp(f, "watchdog-timestamp", &s->watchdog_timestamp); (void) serialize_bool(f, "forbid-restart", s->forbid_restart); if (s->watchdog_override_enable) (void) serialize_item_format(f, "watchdog-override-usec", USEC_FMT, s->watchdog_override_usec); if (s->watchdog_original_usec != USEC_INFINITY) (void) serialize_item_format(f, "watchdog-original-usec", USEC_FMT, s->watchdog_original_usec); return 0; } static int service_deserialize_exec_command(Unit *u, const char *key, const char *value) { Service *s = SERVICE(u); int r; unsigned idx = 0, i; bool control, found = false; ServiceExecCommand id = _SERVICE_EXEC_COMMAND_INVALID; ExecCommand *command = NULL; _cleanup_free_ char *path = NULL; _cleanup_strv_free_ char **argv = NULL; enum ExecCommandState { STATE_EXEC_COMMAND_TYPE, STATE_EXEC_COMMAND_INDEX, STATE_EXEC_COMMAND_PATH, STATE_EXEC_COMMAND_ARGS, _STATE_EXEC_COMMAND_MAX, _STATE_EXEC_COMMAND_INVALID = -1, } state; assert(s); assert(key); assert(value); control = streq(key, "control-command"); state = STATE_EXEC_COMMAND_TYPE; for (;;) { _cleanup_free_ char *arg = NULL; r = extract_first_word(&value, &arg, NULL, EXTRACT_CUNESCAPE | EXTRACT_UNQUOTE); if (r < 0) return r; if (r == 0) break; switch (state) { case STATE_EXEC_COMMAND_TYPE: id = service_exec_command_from_string(arg); if (id < 0) return -EINVAL; state = STATE_EXEC_COMMAND_INDEX; break; case STATE_EXEC_COMMAND_INDEX: r = safe_atou(arg, &idx); if (r < 0) return -EINVAL; state = STATE_EXEC_COMMAND_PATH; break; case STATE_EXEC_COMMAND_PATH: path = TAKE_PTR(arg); state = STATE_EXEC_COMMAND_ARGS; if (!path_is_absolute(path)) return -EINVAL; break; case STATE_EXEC_COMMAND_ARGS: r = strv_extend(&argv, arg); if (r < 0) return -ENOMEM; break; default: assert_not_reached("Unknown error at deserialization of exec command"); break; } } if (state != STATE_EXEC_COMMAND_ARGS) return -EINVAL; /* Let's check whether exec command on given offset matches data that we just deserialized */ for (command = s->exec_command[id], i = 0; command; command = command->command_next, i++) { if (i != idx) continue; found = strv_equal(argv, command->argv) && streq(command->path, path); break; } if (!found) { /* Command at the index we serialized is different, let's look for command that exactly * matches but is on different index. If there is no such command we will not resume execution. */ for (command = s->exec_command[id]; command; command = command->command_next) if (strv_equal(command->argv, argv) && streq(command->path, path)) break; } if (command && control) s->control_command = command; else if (command) s->main_command = command; else log_unit_warning(u, "Current command vanished from the unit file, execution of the command list won't be resumed."); return 0; } static int service_deserialize_item(Unit *u, const char *key, const char *value, FDSet *fds) { Service *s = SERVICE(u); int r; assert(u); assert(key); assert(value); assert(fds); if (streq(key, "state")) { ServiceState state; state = service_state_from_string(value); if (state < 0) log_unit_debug(u, "Failed to parse state value: %s", value); else s->deserialized_state = state; } else if (streq(key, "result")) { ServiceResult f; f = service_result_from_string(value); if (f < 0) log_unit_debug(u, "Failed to parse result value: %s", value); else if (f != SERVICE_SUCCESS) s->result = f; } else if (streq(key, "reload-result")) { ServiceResult f; f = service_result_from_string(value); if (f < 0) log_unit_debug(u, "Failed to parse reload result value: %s", value); else if (f != SERVICE_SUCCESS) s->reload_result = f; } else if (streq(key, "control-pid")) { pid_t pid; if (parse_pid(value, &pid) < 0) log_unit_debug(u, "Failed to parse control-pid value: %s", value); else s->control_pid = pid; } else if (streq(key, "main-pid")) { pid_t pid; if (parse_pid(value, &pid) < 0) log_unit_debug(u, "Failed to parse main-pid value: %s", value); else (void) service_set_main_pid(s, pid); } else if (streq(key, "main-pid-known")) { int b; b = parse_boolean(value); if (b < 0) log_unit_debug(u, "Failed to parse main-pid-known value: %s", value); else s->main_pid_known = b; } else if (streq(key, "bus-name-good")) { int b; b = parse_boolean(value); if (b < 0) log_unit_debug(u, "Failed to parse bus-name-good value: %s", value); else s->bus_name_good = b; } else if (streq(key, "bus-name-owner")) { r = free_and_strdup(&s->bus_name_owner, value); if (r < 0) log_unit_error_errno(u, r, "Unable to deserialize current bus owner %s: %m", value); } else if (streq(key, "status-text")) { char *t; r = cunescape(value, 0, &t); if (r < 0) log_unit_debug_errno(u, r, "Failed to unescape status text '%s': %m", value); else free_and_replace(s->status_text, t); } else if (streq(key, "accept-socket")) { Unit *socket; r = manager_load_unit(u->manager, value, NULL, NULL, &socket); if (r < 0) log_unit_debug_errno(u, r, "Failed to load accept-socket unit '%s': %m", value); else { unit_ref_set(&s->accept_socket, u, socket); SOCKET(socket)->n_connections++; } } else if (streq(key, "socket-fd")) { int fd; if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse socket-fd value: %s", value); else { asynchronous_close(s->socket_fd); s->socket_fd = fdset_remove(fds, fd); } } else if (streq(key, "fd-store-fd")) { const char *fdv; size_t pf; int fd; pf = strcspn(value, WHITESPACE); fdv = strndupa(value, pf); if (safe_atoi(fdv, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse fd-store-fd value: %s", value); else { _cleanup_free_ char *t = NULL; const char *fdn; fdn = value + pf; fdn += strspn(fdn, WHITESPACE); (void) cunescape(fdn, 0, &t); r = service_add_fd_store(s, fd, t); if (r < 0) log_unit_error_errno(u, r, "Failed to add fd to store: %m"); else fdset_remove(fds, fd); } } else if (streq(key, "main-exec-status-pid")) { pid_t pid; if (parse_pid(value, &pid) < 0) log_unit_debug(u, "Failed to parse main-exec-status-pid value: %s", value); else s->main_exec_status.pid = pid; } else if (streq(key, "main-exec-status-code")) { int i; if (safe_atoi(value, &i) < 0) log_unit_debug(u, "Failed to parse main-exec-status-code value: %s", value); else s->main_exec_status.code = i; } else if (streq(key, "main-exec-status-status")) { int i; if (safe_atoi(value, &i) < 0) log_unit_debug(u, "Failed to parse main-exec-status-status value: %s", value); else s->main_exec_status.status = i; } else if (streq(key, "main-exec-status-start")) deserialize_dual_timestamp(value, &s->main_exec_status.start_timestamp); else if (streq(key, "main-exec-status-exit")) deserialize_dual_timestamp(value, &s->main_exec_status.exit_timestamp); else if (streq(key, "watchdog-timestamp")) deserialize_dual_timestamp(value, &s->watchdog_timestamp); else if (streq(key, "forbid-restart")) { int b; b = parse_boolean(value); if (b < 0) log_unit_debug(u, "Failed to parse forbid-restart value: %s", value); else s->forbid_restart = b; } else if (streq(key, "stdin-fd")) { int fd; if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse stdin-fd value: %s", value); else { asynchronous_close(s->stdin_fd); s->stdin_fd = fdset_remove(fds, fd); s->exec_context.stdio_as_fds = true; } } else if (streq(key, "stdout-fd")) { int fd; if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse stdout-fd value: %s", value); else { asynchronous_close(s->stdout_fd); s->stdout_fd = fdset_remove(fds, fd); s->exec_context.stdio_as_fds = true; } } else if (streq(key, "stderr-fd")) { int fd; if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse stderr-fd value: %s", value); else { asynchronous_close(s->stderr_fd); s->stderr_fd = fdset_remove(fds, fd); s->exec_context.stdio_as_fds = true; } } else if (streq(key, "exec-fd")) { int fd; if (safe_atoi(value, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd)) log_unit_debug(u, "Failed to parse exec-fd value: %s", value); else { s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source); fd = fdset_remove(fds, fd); if (service_allocate_exec_fd_event_source(s, fd, &s->exec_fd_event_source) < 0) safe_close(fd); } } else if (streq(key, "watchdog-override-usec")) { if (deserialize_usec(value, &s->watchdog_override_usec) < 0) log_unit_debug(u, "Failed to parse watchdog_override_usec value: %s", value); else s->watchdog_override_enable = true; } else if (streq(key, "watchdog-original-usec")) { if (deserialize_usec(value, &s->watchdog_original_usec) < 0) log_unit_debug(u, "Failed to parse watchdog_original_usec value: %s", value); } else if (STR_IN_SET(key, "main-command", "control-command")) { r = service_deserialize_exec_command(u, key, value); if (r < 0) log_unit_debug_errno(u, r, "Failed to parse serialized command \"%s\": %m", value); } else if (streq(key, "n-restarts")) { r = safe_atou(value, &s->n_restarts); if (r < 0) log_unit_debug_errno(u, r, "Failed to parse serialized restart counter '%s': %m", value); } else if (streq(key, "flush-n-restarts")) { r = parse_boolean(value); if (r < 0) log_unit_debug_errno(u, r, "Failed to parse serialized flush restart counter setting '%s': %m", value); else s->flush_n_restarts = r; } else log_unit_debug(u, "Unknown serialization key: %s", key); return 0; } _pure_ static UnitActiveState service_active_state(Unit *u) { const UnitActiveState *table; assert(u); table = SERVICE(u)->type == SERVICE_IDLE ? state_translation_table_idle : state_translation_table; return table[SERVICE(u)->state]; } static const char *service_sub_state_to_string(Unit *u) { assert(u); return service_state_to_string(SERVICE(u)->state); } static bool service_may_gc(Unit *u) { Service *s = SERVICE(u); assert(s); /* Never clean up services that still have a process around, even if the service is formally dead. Note that * unit_may_gc() already checked our cgroup for us, we just check our two additional PIDs, too, in case they * have moved outside of the cgroup. */ if (main_pid_good(s) > 0 || control_pid_good(s) > 0) return false; return true; } static int service_retry_pid_file(Service *s) { int r; assert(s->pid_file); assert(IN_SET(s->state, SERVICE_START, SERVICE_START_POST)); r = service_load_pid_file(s, false); if (r < 0) return r; service_unwatch_pid_file(s); service_enter_running(s, SERVICE_SUCCESS); return 0; } static int service_watch_pid_file(Service *s) { int r; log_unit_debug(UNIT(s), "Setting watch for PID file %s", s->pid_file_pathspec->path); r = path_spec_watch(s->pid_file_pathspec, service_dispatch_inotify_io); if (r < 0) goto fail; /* the pidfile might have appeared just before we set the watch */ log_unit_debug(UNIT(s), "Trying to read PID file %s in case it changed", s->pid_file_pathspec->path); service_retry_pid_file(s); return 0; fail: log_unit_error_errno(UNIT(s), r, "Failed to set a watch for PID file %s: %m", s->pid_file_pathspec->path); service_unwatch_pid_file(s); return r; } static int service_demand_pid_file(Service *s) { PathSpec *ps; assert(s->pid_file); assert(!s->pid_file_pathspec); ps = new0(PathSpec, 1); if (!ps) return -ENOMEM; ps->unit = UNIT(s); ps->path = strdup(s->pid_file); if (!ps->path) { free(ps); return -ENOMEM; } path_simplify(ps->path, false); /* PATH_CHANGED would not be enough. There are daemons (sendmail) that * keep their PID file open all the time. */ ps->type = PATH_MODIFIED; ps->inotify_fd = -1; s->pid_file_pathspec = ps; return service_watch_pid_file(s); } static int service_dispatch_inotify_io(sd_event_source *source, int fd, uint32_t events, void *userdata) { PathSpec *p = userdata; Service *s; assert(p); s = SERVICE(p->unit); assert(s); assert(fd >= 0); assert(IN_SET(s->state, SERVICE_START, SERVICE_START_POST)); assert(s->pid_file_pathspec); assert(path_spec_owns_inotify_fd(s->pid_file_pathspec, fd)); log_unit_debug(UNIT(s), "inotify event"); if (path_spec_fd_event(p, events) < 0) goto fail; if (service_retry_pid_file(s) == 0) return 0; if (service_watch_pid_file(s) < 0) goto fail; return 0; fail: service_unwatch_pid_file(s); service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_RESOURCES); return 0; } static int service_dispatch_exec_io(sd_event_source *source, int fd, uint32_t events, void *userdata) { Service *s = SERVICE(userdata); assert(s); log_unit_debug(UNIT(s), "got exec-fd event"); /* If Type=exec is set, we'll consider a service started successfully the instant we invoked execve() * successfully for it. We implement this through a pipe() towards the child, which the kernel automatically * closes for us due to O_CLOEXEC on execve() in the child, which then triggers EOF on the pipe in the * parent. We need to be careful however, as there are other reasons that we might cause the child's side of * the pipe to be closed (for example, a simple exit()). To deal with that we'll ignore EOFs on the pipe unless * the child signalled us first that it is about to call the execve(). It does so by sending us a simple * non-zero byte via the pipe. We also provide the child with a way to inform us in case execve() failed: if it * sends a zero byte we'll ignore POLLHUP on the fd again. */ for (;;) { uint8_t x; ssize_t n; n = read(fd, &x, sizeof(x)); if (n < 0) { if (errno == EAGAIN) /* O_NONBLOCK in effect → everything queued has now been processed. */ return 0; return log_unit_error_errno(UNIT(s), errno, "Failed to read from exec_fd: %m"); } if (n == 0) { /* EOF → the event we are waiting for */ s->exec_fd_event_source = sd_event_source_unref(s->exec_fd_event_source); if (s->exec_fd_hot) { /* Did the child tell us to expect EOF now? */ log_unit_debug(UNIT(s), "Got EOF on exec-fd"); s->exec_fd_hot = false; /* Nice! This is what we have been waiting for. Transition to next state. */ if (s->type == SERVICE_EXEC && s->state == SERVICE_START) service_enter_start_post(s); } else log_unit_debug(UNIT(s), "Got EOF on exec-fd while it was disabled, ignoring."); return 0; } /* A byte was read → this turns on/off the exec fd logic */ assert(n == sizeof(x)); s->exec_fd_hot = x; } return 0; } static void service_notify_cgroup_empty_event(Unit *u) { Service *s = SERVICE(u); assert(u); log_unit_debug(u, "Control group is empty."); switch (s->state) { /* Waiting for SIGCHLD is usually more interesting, * because it includes return codes/signals. Which is * why we ignore the cgroup events for most cases, * except when we don't know pid which to expect the * SIGCHLD for. */ case SERVICE_START: if (s->type == SERVICE_NOTIFY && main_pid_good(s) == 0 && control_pid_good(s) == 0) { /* No chance of getting a ready notification anymore */ service_enter_stop_post(s, SERVICE_FAILURE_PROTOCOL); break; } _fallthrough_; case SERVICE_START_POST: if (s->pid_file_pathspec && main_pid_good(s) == 0 && control_pid_good(s) == 0) { /* Give up hoping for the daemon to write its PID file */ log_unit_warning(u, "Daemon never wrote its PID file. Failing."); service_unwatch_pid_file(s); if (s->state == SERVICE_START) service_enter_stop_post(s, SERVICE_FAILURE_PROTOCOL); else service_enter_stop(s, SERVICE_FAILURE_PROTOCOL); } break; case SERVICE_RUNNING: /* service_enter_running() will figure out what to do */ service_enter_running(s, SERVICE_SUCCESS); break; case SERVICE_STOP_WATCHDOG: case SERVICE_STOP_SIGTERM: case SERVICE_STOP_SIGKILL: if (main_pid_good(s) <= 0 && control_pid_good(s) <= 0) service_enter_stop_post(s, SERVICE_SUCCESS); break; case SERVICE_STOP_POST: case SERVICE_FINAL_SIGTERM: case SERVICE_FINAL_SIGKILL: if (main_pid_good(s) <= 0 && control_pid_good(s) <= 0) service_enter_dead(s, SERVICE_SUCCESS, true); break; default: ; } } static void service_notify_cgroup_oom_event(Unit *u) { Service *s = SERVICE(u); log_unit_debug(u, "Process of control group was killed by the OOM killer."); if (s->oom_policy == OOM_CONTINUE) return; switch (s->state) { case SERVICE_CONDITION: case SERVICE_START_PRE: case SERVICE_START: case SERVICE_START_POST: case SERVICE_STOP: if (s->oom_policy == OOM_STOP) service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_OOM_KILL); else if (s->oom_policy == OOM_KILL) service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_FAILURE_OOM_KILL); break; case SERVICE_EXITED: case SERVICE_RUNNING: if (s->oom_policy == OOM_STOP) service_enter_stop(s, SERVICE_FAILURE_OOM_KILL); else if (s->oom_policy == OOM_KILL) service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_FAILURE_OOM_KILL); break; case SERVICE_STOP_WATCHDOG: case SERVICE_STOP_SIGTERM: service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_FAILURE_OOM_KILL); break; case SERVICE_STOP_SIGKILL: case SERVICE_FINAL_SIGKILL: if (s->result == SERVICE_SUCCESS) s->result = SERVICE_FAILURE_OOM_KILL; break; case SERVICE_STOP_POST: case SERVICE_FINAL_SIGTERM: service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_FAILURE_OOM_KILL); break; default: ; } } static void service_sigchld_event(Unit *u, pid_t pid, int code, int status) { bool notify_dbus = true; Service *s = SERVICE(u); ServiceResult f; ExitClean clean_mode; assert(s); assert(pid >= 0); /* Oneshot services and non-SERVICE_EXEC_START commands should not be * considered daemons as they are typically not long running. */ if (s->type == SERVICE_ONESHOT || (s->control_pid == pid && s->control_command_id != SERVICE_EXEC_START)) clean_mode = EXIT_CLEAN_COMMAND; else clean_mode = EXIT_CLEAN_DAEMON; if (is_clean_exit(code, status, clean_mode, &s->success_status)) f = SERVICE_SUCCESS; else if (code == CLD_EXITED) f = SERVICE_FAILURE_EXIT_CODE; else if (code == CLD_KILLED) f = SERVICE_FAILURE_SIGNAL; else if (code == CLD_DUMPED) f = SERVICE_FAILURE_CORE_DUMP; else assert_not_reached("Unknown code"); if (s->main_pid == pid) { /* Forking services may occasionally move to a new PID. * As long as they update the PID file before exiting the old * PID, they're fine. */ if (service_load_pid_file(s, false) > 0) return; s->main_pid = 0; exec_status_exit(&s->main_exec_status, &s->exec_context, pid, code, status); if (s->main_command) { /* If this is not a forking service than the * main process got started and hence we copy * the exit status so that it is recorded both * as main and as control process exit * status */ s->main_command->exec_status = s->main_exec_status; if (s->main_command->flags & EXEC_COMMAND_IGNORE_FAILURE) f = SERVICE_SUCCESS; } else if (s->exec_command[SERVICE_EXEC_START]) { /* If this is a forked process, then we should * ignore the return value if this was * configured for the starter process */ if (s->exec_command[SERVICE_EXEC_START]->flags & EXEC_COMMAND_IGNORE_FAILURE) f = SERVICE_SUCCESS; } unit_log_process_exit( u, "Main process", service_exec_command_to_string(SERVICE_EXEC_START), f == SERVICE_SUCCESS, code, status); if (s->result == SERVICE_SUCCESS) s->result = f; if (s->main_command && s->main_command->command_next && s->type == SERVICE_ONESHOT && f == SERVICE_SUCCESS) { /* There is another command to * * execute, so let's do that. */ log_unit_debug(u, "Running next main command for state %s.", service_state_to_string(s->state)); service_run_next_main(s); } else { /* The service exited, so the service is officially * gone. */ s->main_command = NULL; switch (s->state) { case SERVICE_START_POST: case SERVICE_RELOAD: case SERVICE_STOP: /* Need to wait until the operation is * done */ break; case SERVICE_START: if (s->type == SERVICE_ONESHOT) { /* This was our main goal, so let's go on */ if (f == SERVICE_SUCCESS) service_enter_start_post(s); else service_enter_signal(s, SERVICE_STOP_SIGTERM, f); break; } else if (s->type == SERVICE_NOTIFY) { /* Only enter running through a notification, so that the * SERVICE_START state signifies that no ready notification * has been received */ if (f != SERVICE_SUCCESS) service_enter_signal(s, SERVICE_STOP_SIGTERM, f); else if (!s->remain_after_exit || s->notify_access == NOTIFY_MAIN) /* The service has never been and will never be active */ service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_PROTOCOL); break; } _fallthrough_; case SERVICE_RUNNING: service_enter_running(s, f); break; case SERVICE_STOP_WATCHDOG: case SERVICE_STOP_SIGTERM: case SERVICE_STOP_SIGKILL: if (control_pid_good(s) <= 0) service_enter_stop_post(s, f); /* If there is still a control process, wait for that first */ break; case SERVICE_STOP_POST: case SERVICE_FINAL_SIGTERM: case SERVICE_FINAL_SIGKILL: if (control_pid_good(s) <= 0) service_enter_dead(s, f, true); break; default: assert_not_reached("Uh, main process died at wrong time."); } } } else if (s->control_pid == pid) { s->control_pid = 0; /* ExecCondition= calls that exit with (0, 254] should invoke skip-like behavior instead of failing */ if (f == SERVICE_FAILURE_EXIT_CODE && s->state == SERVICE_CONDITION && status < 255) f = SERVICE_SKIP_CONDITION; if (s->control_command) { exec_status_exit(&s->control_command->exec_status, &s->exec_context, pid, code, status); if (s->control_command->flags & EXEC_COMMAND_IGNORE_FAILURE) f = SERVICE_SUCCESS; } unit_log_process_exit( u, "Control process", service_exec_command_to_string(s->control_command_id), f == SERVICE_SUCCESS, code, status); if (s->state != SERVICE_RELOAD && s->result == SERVICE_SUCCESS) s->result = f; if (s->control_command && s->control_command->command_next && f == SERVICE_SUCCESS) { /* There is another command to * * execute, so let's do that. */ log_unit_debug(u, "Running next control command for state %s.", service_state_to_string(s->state)); service_run_next_control(s); } else { /* No further commands for this step, so let's * figure out what to do next */ s->control_command = NULL; s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID; log_unit_debug(u, "Got final SIGCHLD for state %s.", service_state_to_string(s->state)); switch (s->state) { case SERVICE_CONDITION: if (f == SERVICE_SUCCESS) service_enter_start_pre(s); else service_enter_signal(s, SERVICE_STOP_SIGTERM, f); break; case SERVICE_START_PRE: if (f == SERVICE_SUCCESS) service_enter_start(s); else service_enter_signal(s, SERVICE_STOP_SIGTERM, f); break; case SERVICE_START: if (s->type != SERVICE_FORKING) /* Maybe spurious event due to a reload that changed the type? */ break; if (f != SERVICE_SUCCESS) { service_enter_signal(s, SERVICE_STOP_SIGTERM, f); break; } if (s->pid_file) { bool has_start_post; int r; /* Let's try to load the pid file here if we can. * The PID file might actually be created by a START_POST * script. In that case don't worry if the loading fails. */ has_start_post = s->exec_command[SERVICE_EXEC_START_POST]; r = service_load_pid_file(s, !has_start_post); if (!has_start_post && r < 0) { r = service_demand_pid_file(s); if (r < 0 || cgroup_good(s) == 0) service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_PROTOCOL); break; } } else service_search_main_pid(s); service_enter_start_post(s); break; case SERVICE_START_POST: if (f != SERVICE_SUCCESS) { service_enter_signal(s, SERVICE_STOP_SIGTERM, f); break; } if (s->pid_file) { int r; r = service_load_pid_file(s, true); if (r < 0) { r = service_demand_pid_file(s); if (r < 0 || cgroup_good(s) == 0) service_enter_stop(s, SERVICE_FAILURE_PROTOCOL); break; } } else service_search_main_pid(s); service_enter_running(s, SERVICE_SUCCESS); break; case SERVICE_RELOAD: if (f == SERVICE_SUCCESS) if (service_load_pid_file(s, true) < 0) service_search_main_pid(s); s->reload_result = f; service_enter_running(s, SERVICE_SUCCESS); break; case SERVICE_STOP: service_enter_signal(s, SERVICE_STOP_SIGTERM, f); break; case SERVICE_STOP_WATCHDOG: case SERVICE_STOP_SIGTERM: case SERVICE_STOP_SIGKILL: if (main_pid_good(s) <= 0) service_enter_stop_post(s, f); /* If there is still a service process around, wait until * that one quit, too */ break; case SERVICE_STOP_POST: case SERVICE_FINAL_SIGTERM: case SERVICE_FINAL_SIGKILL: if (main_pid_good(s) <= 0) service_enter_dead(s, f, true); break; case SERVICE_CLEANING: if (s->clean_result == SERVICE_SUCCESS) s->clean_result = f; service_enter_dead(s, SERVICE_SUCCESS, false); break; default: assert_not_reached("Uh, control process died at wrong time."); } } } else /* Neither control nor main PID? If so, don't notify about anything */ notify_dbus = false; /* Notify clients about changed exit status */ if (notify_dbus) unit_add_to_dbus_queue(u); /* We watch the main/control process otherwise we can't retrieve the unit they * belong to with cgroupv1. But if they are not our direct child, we won't get a * SIGCHLD for them. Therefore we need to look for others to watch so we can * detect when the cgroup becomes empty. Note that the control process is always * our child so it's pointless to watch all other processes. */ if (!control_pid_good(s)) if (!s->main_pid_known || s->main_pid_alien) (void) unit_enqueue_rewatch_pids(u); } static int service_dispatch_timer(sd_event_source *source, usec_t usec, void *userdata) { Service *s = SERVICE(userdata); assert(s); assert(source == s->timer_event_source); switch (s->state) { case SERVICE_CONDITION: case SERVICE_START_PRE: case SERVICE_START: log_unit_warning(UNIT(s), "%s operation timed out. Terminating.", service_state_to_string(s->state)); service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_START_POST: log_unit_warning(UNIT(s), "Start-post operation timed out. Stopping."); service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_RUNNING: log_unit_warning(UNIT(s), "Service reached runtime time limit. Stopping."); service_enter_stop(s, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_RELOAD: log_unit_warning(UNIT(s), "Reload operation timed out. Killing reload process."); service_kill_control_process(s); s->reload_result = SERVICE_FAILURE_TIMEOUT; service_enter_running(s, SERVICE_SUCCESS); break; case SERVICE_STOP: log_unit_warning(UNIT(s), "Stopping timed out. Terminating."); service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_STOP_WATCHDOG: log_unit_warning(UNIT(s), "State 'stop-watchdog' timed out. Terminating."); service_enter_signal(s, SERVICE_STOP_SIGTERM, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_STOP_SIGTERM: if (s->kill_context.send_sigkill) { log_unit_warning(UNIT(s), "State 'stop-sigterm' timed out. Killing."); service_enter_signal(s, SERVICE_STOP_SIGKILL, SERVICE_FAILURE_TIMEOUT); } else { log_unit_warning(UNIT(s), "State 'stop-sigterm' timed out. Skipping SIGKILL."); service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT); } break; case SERVICE_STOP_SIGKILL: /* Uh, we sent a SIGKILL and it is still not gone? * Must be something we cannot kill, so let's just be * weirded out and continue */ log_unit_warning(UNIT(s), "Processes still around after SIGKILL. Ignoring."); service_enter_stop_post(s, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_STOP_POST: log_unit_warning(UNIT(s), "State 'stop-post' timed out. Terminating."); service_enter_signal(s, SERVICE_FINAL_SIGTERM, SERVICE_FAILURE_TIMEOUT); break; case SERVICE_FINAL_SIGTERM: if (s->kill_context.send_sigkill) { log_unit_warning(UNIT(s), "State 'stop-final-sigterm' timed out. Killing."); service_enter_signal(s, SERVICE_FINAL_SIGKILL, SERVICE_FAILURE_TIMEOUT); } else { log_unit_warning(UNIT(s), "State 'stop-final-sigterm' timed out. Skipping SIGKILL. Entering failed mode."); service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, false); } break; case SERVICE_FINAL_SIGKILL: log_unit_warning(UNIT(s), "Processes still around after final SIGKILL. Entering failed mode."); service_enter_dead(s, SERVICE_FAILURE_TIMEOUT, true); break; case SERVICE_AUTO_RESTART: if (s->restart_usec > 0) { char buf_restart[FORMAT_TIMESPAN_MAX]; log_unit_info(UNIT(s), "Service RestartSec=%s expired, scheduling restart.", format_timespan(buf_restart, sizeof buf_restart, s->restart_usec, USEC_PER_SEC)); } else log_unit_info(UNIT(s), "Service has no hold-off time (RestartSec=0), scheduling restart."); service_enter_restart(s); break; case SERVICE_CLEANING: log_unit_warning(UNIT(s), "Cleaning timed out. killing."); if (s->clean_result == SERVICE_SUCCESS) s->clean_result = SERVICE_FAILURE_TIMEOUT; service_enter_signal(s, SERVICE_FINAL_SIGKILL, 0); break; default: assert_not_reached("Timeout at wrong time."); } return 0; } static int service_dispatch_watchdog(sd_event_source *source, usec_t usec, void *userdata) { Service *s = SERVICE(userdata); char t[FORMAT_TIMESPAN_MAX]; usec_t watchdog_usec; assert(s); assert(source == s->watchdog_event_source); watchdog_usec = service_get_watchdog_usec(s); if (UNIT(s)->manager->service_watchdogs) { log_unit_error(UNIT(s), "Watchdog timeout (limit %s)!", format_timespan(t, sizeof(t), watchdog_usec, 1)); service_enter_signal(s, SERVICE_STOP_WATCHDOG, SERVICE_FAILURE_WATCHDOG); } else log_unit_warning(UNIT(s), "Watchdog disabled! Ignoring watchdog timeout (limit %s)!", format_timespan(t, sizeof(t), watchdog_usec, 1)); return 0; } static bool service_notify_message_authorized(Service *s, pid_t pid, char **tags, FDSet *fds) { assert(s); if (s->notify_access == NOTIFY_NONE) { log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception is disabled.", pid); return false; } if (s->notify_access == NOTIFY_MAIN && pid != s->main_pid) { if (s->main_pid != 0) log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT, pid, s->main_pid); else log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID which is currently not known", pid); return false; } if (s->notify_access == NOTIFY_EXEC && pid != s->main_pid && pid != s->control_pid) { if (s->main_pid != 0 && s->control_pid != 0) log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT" and control PID "PID_FMT, pid, s->main_pid, s->control_pid); else if (s->main_pid != 0) log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID "PID_FMT, pid, s->main_pid); else if (s->control_pid != 0) log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for control PID "PID_FMT, pid, s->control_pid); else log_unit_warning(UNIT(s), "Got notification message from PID "PID_FMT", but reception only permitted for main PID and control PID which are currently not known", pid); return false; } return true; } static void service_force_watchdog(Service *s) { if (!UNIT(s)->manager->service_watchdogs) return; log_unit_error(UNIT(s), "Watchdog request (last status: %s)!", s->status_text ? s->status_text : ""); service_enter_signal(s, SERVICE_STOP_WATCHDOG, SERVICE_FAILURE_WATCHDOG); } static void service_notify_message( Unit *u, const struct ucred *ucred, char **tags, FDSet *fds) { Service *s = SERVICE(u); bool notify_dbus = false; const char *e; char **i; int r; assert(u); assert(ucred); if (!service_notify_message_authorized(SERVICE(u), ucred->pid, tags, fds)) return; if (DEBUG_LOGGING) { _cleanup_free_ char *cc = NULL; cc = strv_join(tags, ", "); log_unit_debug(u, "Got notification message from PID "PID_FMT" (%s)", ucred->pid, isempty(cc) ? "n/a" : cc); } /* Interpret MAINPID= */ e = strv_find_startswith(tags, "MAINPID="); if (e && IN_SET(s->state, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) { pid_t new_main_pid; if (parse_pid(e, &new_main_pid) < 0) log_unit_warning(u, "Failed to parse MAINPID= field in notification message, ignoring: %s", e); else if (!s->main_pid_known || new_main_pid != s->main_pid) { r = service_is_suitable_main_pid(s, new_main_pid, LOG_WARNING); if (r == 0) { /* The new main PID is a bit suspicious, which is OK if the sender is privileged. */ if (ucred->uid == 0) { log_unit_debug(u, "New main PID "PID_FMT" does not belong to service, but we'll accept it as the request to change it came from a privileged process.", new_main_pid); r = 1; } else log_unit_debug(u, "New main PID "PID_FMT" does not belong to service, refusing.", new_main_pid); } if (r > 0) { service_set_main_pid(s, new_main_pid); r = unit_watch_pid(UNIT(s), new_main_pid, false); if (r < 0) log_unit_warning_errno(UNIT(s), r, "Failed to watch new main PID "PID_FMT" for service: %m", new_main_pid); notify_dbus = true; } } } /* Interpret READY=/STOPPING=/RELOADING=. Last one wins. */ STRV_FOREACH_BACKWARDS(i, tags) { if (streq(*i, "READY=1")) { s->notify_state = NOTIFY_READY; /* Type=notify services inform us about completed * initialization with READY=1 */ if (s->type == SERVICE_NOTIFY && s->state == SERVICE_START) service_enter_start_post(s); /* Sending READY=1 while we are reloading informs us * that the reloading is complete */ if (s->state == SERVICE_RELOAD && s->control_pid == 0) service_enter_running(s, SERVICE_SUCCESS); notify_dbus = true; break; } else if (streq(*i, "RELOADING=1")) { s->notify_state = NOTIFY_RELOADING; if (s->state == SERVICE_RUNNING) service_enter_reload_by_notify(s); notify_dbus = true; break; } else if (streq(*i, "STOPPING=1")) { s->notify_state = NOTIFY_STOPPING; if (s->state == SERVICE_RUNNING) service_enter_stop_by_notify(s); notify_dbus = true; break; } } /* Interpret STATUS= */ e = strv_find_startswith(tags, "STATUS="); if (e) { _cleanup_free_ char *t = NULL; if (!isempty(e)) { /* Note that this size limit check is mostly paranoia: since the datagram size we are willing * to process is already limited to NOTIFY_BUFFER_MAX, this limit here should never be hit. */ if (strlen(e) > STATUS_TEXT_MAX) log_unit_warning(u, "Status message overly long (%zu > %u), ignoring.", strlen(e), STATUS_TEXT_MAX); else if (!utf8_is_valid(e)) log_unit_warning(u, "Status message in notification message is not UTF-8 clean, ignoring."); else { t = strdup(e); if (!t) log_oom(); } } if (!streq_ptr(s->status_text, t)) { free_and_replace(s->status_text, t); notify_dbus = true; } } /* Interpret ERRNO= */ e = strv_find_startswith(tags, "ERRNO="); if (e) { int status_errno; status_errno = parse_errno(e); if (status_errno < 0) log_unit_warning_errno(u, status_errno, "Failed to parse ERRNO= field value '%s' in notification message: %m", e); else if (s->status_errno != status_errno) { s->status_errno = status_errno; notify_dbus = true; } } /* Interpret EXTEND_TIMEOUT= */ e = strv_find_startswith(tags, "EXTEND_TIMEOUT_USEC="); if (e) { usec_t extend_timeout_usec; if (safe_atou64(e, &extend_timeout_usec) < 0) log_unit_warning(u, "Failed to parse EXTEND_TIMEOUT_USEC=%s", e); else service_extend_timeout(s, extend_timeout_usec); } /* Interpret WATCHDOG= */ e = strv_find_startswith(tags, "WATCHDOG="); if (e) { if (streq(e, "1")) service_reset_watchdog(s); else if (streq(e, "trigger")) service_force_watchdog(s); else log_unit_warning(u, "Passed WATCHDOG= field is invalid, ignoring."); } e = strv_find_startswith(tags, "WATCHDOG_USEC="); if (e) { usec_t watchdog_override_usec; if (safe_atou64(e, &watchdog_override_usec) < 0) log_unit_warning(u, "Failed to parse WATCHDOG_USEC=%s", e); else service_override_watchdog_timeout(s, watchdog_override_usec); } /* Process FD store messages. Either FDSTOREREMOVE=1 for removal, or FDSTORE=1 for addition. In both cases, * process FDNAME= for picking the file descriptor name to use. Note that FDNAME= is required when removing * fds, but optional when pushing in new fds, for compatibility reasons. */ if (strv_find(tags, "FDSTOREREMOVE=1")) { const char *name; name = strv_find_startswith(tags, "FDNAME="); if (!name || !fdname_is_valid(name)) log_unit_warning(u, "FDSTOREREMOVE=1 requested, but no valid file descriptor name passed, ignoring."); else service_remove_fd_store(s, name); } else if (strv_find(tags, "FDSTORE=1")) { const char *name; name = strv_find_startswith(tags, "FDNAME="); if (name && !fdname_is_valid(name)) { log_unit_warning(u, "Passed FDNAME= name is invalid, ignoring."); name = NULL; } (void) service_add_fd_store_set(s, fds, name); } /* Notify clients about changed status or main pid */ if (notify_dbus) unit_add_to_dbus_queue(u); } static int service_get_timeout(Unit *u, usec_t *timeout) { Service *s = SERVICE(u); uint64_t t; int r; if (!s->timer_event_source) return 0; r = sd_event_source_get_time(s->timer_event_source, &t); if (r < 0) return r; if (t == USEC_INFINITY) return 0; *timeout = t; return 1; } static void service_bus_name_owner_change( Unit *u, const char *old_owner, const char *new_owner) { Service *s = SERVICE(u); int r; assert(s); assert(old_owner || new_owner); if (old_owner && new_owner) log_unit_debug(u, "D-Bus name %s changed owner from %s to %s", s->bus_name, old_owner, new_owner); else if (old_owner) log_unit_debug(u, "D-Bus name %s no longer registered by %s", s->bus_name, old_owner); else log_unit_debug(u, "D-Bus name %s now registered by %s", s->bus_name, new_owner); s->bus_name_good = !!new_owner; /* Track the current owner, so we can reconstruct changes after a daemon reload */ r = free_and_strdup(&s->bus_name_owner, new_owner); if (r < 0) { log_unit_error_errno(u, r, "Unable to set new bus name owner %s: %m", new_owner); return; } if (s->type == SERVICE_DBUS) { /* service_enter_running() will figure out what to * do */ if (s->state == SERVICE_RUNNING) service_enter_running(s, SERVICE_SUCCESS); else if (s->state == SERVICE_START && new_owner) service_enter_start_post(s); } else if (new_owner && s->main_pid <= 0 && IN_SET(s->state, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD)) { _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL; pid_t pid; /* Try to acquire PID from bus service */ r = sd_bus_get_name_creds(u->manager->api_bus, s->bus_name, SD_BUS_CREDS_PID, &creds); if (r >= 0) r = sd_bus_creds_get_pid(creds, &pid); if (r >= 0) { log_unit_debug(u, "D-Bus name %s is now owned by process " PID_FMT, s->bus_name, pid); service_set_main_pid(s, pid); unit_watch_pid(UNIT(s), pid, false); } } } int service_set_socket_fd(Service *s, int fd, Socket *sock, bool selinux_context_net) { _cleanup_free_ char *peer = NULL; int r; assert(s); assert(fd >= 0); /* This is called by the socket code when instantiating a new service for a stream socket and the socket needs * to be configured. We take ownership of the passed fd on success. */ if (UNIT(s)->load_state != UNIT_LOADED) return -EINVAL; if (s->socket_fd >= 0) return -EBUSY; if (s->state != SERVICE_DEAD) return -EAGAIN; if (getpeername_pretty(fd, true, &peer) >= 0) { if (UNIT(s)->description) { _cleanup_free_ char *a; a = strjoin(UNIT(s)->description, " (", peer, ")"); if (!a) return -ENOMEM; r = unit_set_description(UNIT(s), a); } else r = unit_set_description(UNIT(s), peer); if (r < 0) return r; } r = unit_add_two_dependencies(UNIT(sock), UNIT_BEFORE, UNIT_TRIGGERS, UNIT(s), false, UNIT_DEPENDENCY_IMPLICIT); if (r < 0) return r; s->socket_fd = fd; s->socket_fd_selinux_context_net = selinux_context_net; unit_ref_set(&s->accept_socket, UNIT(s), UNIT(sock)); return 0; } static void service_reset_failed(Unit *u) { Service *s = SERVICE(u); assert(s); if (s->state == SERVICE_FAILED) service_set_state(s, SERVICE_DEAD); s->result = SERVICE_SUCCESS; s->reload_result = SERVICE_SUCCESS; s->clean_result = SERVICE_SUCCESS; s->n_restarts = 0; s->flush_n_restarts = false; } static int service_kill(Unit *u, KillWho who, int signo, sd_bus_error *error) { Service *s = SERVICE(u); assert(s); return unit_kill_common(u, who, signo, s->main_pid, s->control_pid, error); } static int service_main_pid(Unit *u) { Service *s = SERVICE(u); assert(s); return s->main_pid; } static int service_control_pid(Unit *u) { Service *s = SERVICE(u); assert(s); return s->control_pid; } static bool service_needs_console(Unit *u) { Service *s = SERVICE(u); assert(s); /* We provide our own implementation of this here, instead of relying of the generic implementation * unit_needs_console() provides, since we want to return false if we are in SERVICE_EXITED state. */ if (!exec_context_may_touch_console(&s->exec_context)) return false; return IN_SET(s->state, SERVICE_CONDITION, SERVICE_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RUNNING, SERVICE_RELOAD, SERVICE_STOP, SERVICE_STOP_WATCHDOG, SERVICE_STOP_SIGTERM, SERVICE_STOP_SIGKILL, SERVICE_STOP_POST, SERVICE_FINAL_SIGTERM, SERVICE_FINAL_SIGKILL); } static int service_exit_status(Unit *u) { Service *s = SERVICE(u); assert(u); if (s->main_exec_status.pid <= 0 || !dual_timestamp_is_set(&s->main_exec_status.exit_timestamp)) return -ENODATA; if (s->main_exec_status.code != CLD_EXITED) return -EBADE; return s->main_exec_status.status; } static int service_clean(Unit *u, ExecCleanMask mask) { _cleanup_strv_free_ char **l = NULL; Service *s = SERVICE(u); int r; assert(s); assert(mask != 0); if (s->state != SERVICE_DEAD) return -EBUSY; r = exec_context_get_clean_directories(&s->exec_context, u->manager->prefix, mask, &l); if (r < 0) return r; if (strv_isempty(l)) return -EUNATCH; service_unwatch_control_pid(s); s->clean_result = SERVICE_SUCCESS; s->control_command = NULL; s->control_command_id = _SERVICE_EXEC_COMMAND_INVALID; r = service_arm_timer(s, usec_add(now(CLOCK_MONOTONIC), s->exec_context.timeout_clean_usec)); if (r < 0) goto fail; r = unit_fork_and_watch_rm_rf(u, l, &s->control_pid); if (r < 0) goto fail; service_set_state(s, SERVICE_CLEANING); return 0; fail: log_unit_warning_errno(u, r, "Failed to initiate cleaning: %m"); s->clean_result = SERVICE_FAILURE_RESOURCES; s->timer_event_source = sd_event_source_unref(s->timer_event_source); return r; } static int service_can_clean(Unit *u, ExecCleanMask *ret) { Service *s = SERVICE(u); assert(s); return exec_context_get_clean_mask(&s->exec_context, ret); } static const char* const service_restart_table[_SERVICE_RESTART_MAX] = { [SERVICE_RESTART_NO] = "no", [SERVICE_RESTART_ON_SUCCESS] = "on-success", [SERVICE_RESTART_ON_FAILURE] = "on-failure", [SERVICE_RESTART_ON_ABNORMAL] = "on-abnormal", [SERVICE_RESTART_ON_WATCHDOG] = "on-watchdog", [SERVICE_RESTART_ON_ABORT] = "on-abort", [SERVICE_RESTART_ALWAYS] = "always", }; DEFINE_STRING_TABLE_LOOKUP(service_restart, ServiceRestart); static const char* const service_type_table[_SERVICE_TYPE_MAX] = { [SERVICE_SIMPLE] = "simple", [SERVICE_FORKING] = "forking", [SERVICE_ONESHOT] = "oneshot", [SERVICE_DBUS] = "dbus", [SERVICE_NOTIFY] = "notify", [SERVICE_IDLE] = "idle", [SERVICE_EXEC] = "exec", }; DEFINE_STRING_TABLE_LOOKUP(service_type, ServiceType); static const char* const service_exec_command_table[_SERVICE_EXEC_COMMAND_MAX] = { [SERVICE_EXEC_CONDITION] = "ExecCondition", [SERVICE_EXEC_START_PRE] = "ExecStartPre", [SERVICE_EXEC_START] = "ExecStart", [SERVICE_EXEC_START_POST] = "ExecStartPost", [SERVICE_EXEC_RELOAD] = "ExecReload", [SERVICE_EXEC_STOP] = "ExecStop", [SERVICE_EXEC_STOP_POST] = "ExecStopPost", }; DEFINE_STRING_TABLE_LOOKUP(service_exec_command, ServiceExecCommand); static const char* const service_exec_ex_command_table[_SERVICE_EXEC_COMMAND_MAX] = { [SERVICE_EXEC_CONDITION] = "ExecConditionEx", [SERVICE_EXEC_START_PRE] = "ExecStartPreEx", [SERVICE_EXEC_START] = "ExecStartEx", [SERVICE_EXEC_START_POST] = "ExecStartPostEx", [SERVICE_EXEC_RELOAD] = "ExecReloadEx", [SERVICE_EXEC_STOP] = "ExecStopEx", [SERVICE_EXEC_STOP_POST] = "ExecStopPostEx", }; DEFINE_STRING_TABLE_LOOKUP(service_exec_ex_command, ServiceExecCommand); static const char* const notify_state_table[_NOTIFY_STATE_MAX] = { [NOTIFY_UNKNOWN] = "unknown", [NOTIFY_READY] = "ready", [NOTIFY_RELOADING] = "reloading", [NOTIFY_STOPPING] = "stopping", }; DEFINE_STRING_TABLE_LOOKUP(notify_state, NotifyState); static const char* const service_result_table[_SERVICE_RESULT_MAX] = { [SERVICE_SUCCESS] = "success", [SERVICE_FAILURE_RESOURCES] = "resources", [SERVICE_FAILURE_PROTOCOL] = "protocol", [SERVICE_FAILURE_TIMEOUT] = "timeout", [SERVICE_FAILURE_EXIT_CODE] = "exit-code", [SERVICE_FAILURE_SIGNAL] = "signal", [SERVICE_FAILURE_CORE_DUMP] = "core-dump", [SERVICE_FAILURE_WATCHDOG] = "watchdog", [SERVICE_FAILURE_START_LIMIT_HIT] = "start-limit-hit", [SERVICE_FAILURE_OOM_KILL] = "oom-kill", [SERVICE_SKIP_CONDITION] = "exec-condition", }; DEFINE_STRING_TABLE_LOOKUP(service_result, ServiceResult); const UnitVTable service_vtable = { .object_size = sizeof(Service), .exec_context_offset = offsetof(Service, exec_context), .cgroup_context_offset = offsetof(Service, cgroup_context), .kill_context_offset = offsetof(Service, kill_context), .exec_runtime_offset = offsetof(Service, exec_runtime), .dynamic_creds_offset = offsetof(Service, dynamic_creds), .sections = "Unit\0" "Service\0" "Install\0", .private_section = "Service", .can_transient = true, .can_delegate = true, .init = service_init, .done = service_done, .load = service_load, .release_resources = service_release_resources, .coldplug = service_coldplug, .dump = service_dump, .start = service_start, .stop = service_stop, .reload = service_reload, .can_reload = service_can_reload, .kill = service_kill, .clean = service_clean, .can_clean = service_can_clean, .serialize = service_serialize, .deserialize_item = service_deserialize_item, .active_state = service_active_state, .sub_state_to_string = service_sub_state_to_string, .will_restart = service_will_restart, .may_gc = service_may_gc, .sigchld_event = service_sigchld_event, .reset_failed = service_reset_failed, .notify_cgroup_empty = service_notify_cgroup_empty_event, .notify_cgroup_oom = service_notify_cgroup_oom_event, .notify_message = service_notify_message, .main_pid = service_main_pid, .control_pid = service_control_pid, .bus_name_owner_change = service_bus_name_owner_change, .bus_vtable = bus_service_vtable, .bus_set_property = bus_service_set_property, .bus_commit_properties = bus_service_commit_properties, .get_timeout = service_get_timeout, .needs_console = service_needs_console, .exit_status = service_exit_status, .status_message_formats = { .starting_stopping = { [0] = "Starting %s...", [1] = "Stopping %s...", }, .finished_start_job = { [JOB_DONE] = "Started %s.", [JOB_FAILED] = "Failed to start %s.", [JOB_SKIPPED] = "Skipped %s.", }, .finished_stop_job = { [JOB_DONE] = "Stopped %s.", [JOB_FAILED] = "Stopped (with error) %s.", }, }, };