diff options
Diffstat (limited to 'src/core/service.c')
| -rw-r--r-- | src/core/service.c | 4161 |
1 files changed, 4161 insertions, 0 deletions
diff --git a/src/core/service.c b/src/core/service.c new file mode 100644 index 0000000..324dcf2 --- /dev/null +++ b/src/core/service.c @@ -0,0 +1,4161 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include <errno.h> +#include <signal.h> +#include <unistd.h> + +#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_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 +}; + +/* 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_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 +}; + +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->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; +} + +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) { + pid_t ppid; + + 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; + + if (get_process_ppid(pid, &ppid) >= 0 && ppid != getpid_cached()) { + log_unit_warning(UNIT(s), "Supervising process "PID_FMT" which is not our child. We'll most likely not notice when it exits.", pid); + s->main_pid_alien = true; + } else + s->main_pid_alien = false; + + 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--; + } + + if (fs->event_source) { + sd_event_source_set_enabled(fs->event_source, SD_EVENT_OFF); + sd_event_source_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); + + if (UNIT(s)->load_state != UNIT_LOADED) + return 0; + + 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 && s->restart != SERVICE_RESTART_NO) { + log_unit_error(UNIT(s), "Service has Restart= setting other than no, 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), "MaxRuntimeSec= 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; + + 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; + + assert(s); + + /* Load a .service file */ + r = unit_load_fragment(u); + if (r < 0) + return r; + + /* Still nothing found? Then let's give up */ + if (u->load_state == UNIT_STUB) + return -ENOENT; + + /* This is a new unit? Then let's add in some extras */ + if (u->load_state == UNIT_LOADED) { + + /* We were able to load something, then let's add in + * the dropin directories. */ + r = unit_load_dropin(u); + if (r < 0) + return r; + + /* 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]; + char buf_runtime[FORMAT_TIMESPAN_MAX], buf_watchdog[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" + "%sPermissionsStartOnly: %s\n" + "%sRootDirectoryStartOnly: %s\n" + "%sRemainAfterExit: %s\n" + "%sGuessMainPID: %s\n" + "%sType: %s\n" + "%sRestart: %s\n" + "%sNotifyAccess: %s\n" + "%sNotifyState: %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, 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)); + + 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" + "%sRuntimeMaxSec: %s\n" + "%sWatchdogSec: %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), + 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(&s->cgroup_context, 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); + 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); + 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_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)) + 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_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_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_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)); +} + +static usec_t service_coldplug_timeout(Service *s) { + assert(s); + + switch (s->deserialized_state) { + + 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_WATCHDOG: + 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_AUTO_RESTART: + return usec_add(UNIT(s)->inactive_enter_timestamp.monotonic, s->restart_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); + if (r < 0) + return r; + } + + if (s->control_pid > 0 && + pid_is_unwaited(s->control_pid) && + IN_SET(s->deserialized_state, + 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)) { + r = unit_watch_pid(UNIT(s), s->control_pid); + if (r < 0) + return r; + } + + if (!IN_SET(s->deserialized_state, SERVICE_DEAD, SERVICE_FAILED, SERVICE_AUTO_RESTART)) { + (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*, 9); + 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->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 = strappend("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); + if (r < 0) /* FIXME: we need to do something here */ + 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; + if (!UNIT(s)->job) + return false; + if (UNIT(s)->job->type == JOB_START) + return true; + + return false; +} + +static void service_enter_dead(Service *s, ServiceResult f, bool allow_restart) { + 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; + + unit_log_result(UNIT(s), s->result == SERVICE_SUCCESS, service_result_to_string(s->result)); + + 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, s->result != SERVICE_SUCCESS ? SERVICE_FAILED : SERVICE_DEAD); + + 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 readd 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); + + if (s->exec_context.runtime_directory_preserve_mode == EXEC_PRESERVE_NO || + (s->exec_context.runtime_directory_preserve_mode == EXEC_PRESERVE_RESTART && !service_will_restart(UNIT(s)))) + /* Also, remove the runtime directory */ + exec_context_destroy_runtime_directory(&s->exec_context, UNIT(s)->manager->prefix[EXEC_DIRECTORY_RUNTIME]); + + /* 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); + + 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(ServiceState state) { + switch (state) { + + case SERVICE_STOP_WATCHDOG: + return KILL_WATCHDOG; + + case SERVICE_STOP_SIGTERM: + 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(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), 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 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); + + unit_warn_leftover_processes(UNIT(s)); + + 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 + * inbetween. 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) { + + unit_warn_leftover_processes(UNIT(s)); + + 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_restart(Service *s) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + int r; + + assert(s); + + if (UNIT(s)->job && UNIT(s)->job->type == 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, &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_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_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_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)) + return -EAGAIN; + + /* Already on it! */ + if (IN_SET(s->state, 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_start_limit_test(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_start_pre(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_WATCHDOG, 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_START_PRE, SERVICE_START, SERVICE_START_POST, SERVICE_RELOAD)) { + service_enter_signal(s, SERVICE_STOP_SIGTERM, 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 + 1 + n + 1)) + return log_oom(); + + if (length > 0) + args[length++] = ' '; + + memcpy(args + length, e, n); + length += n; + } + + 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); + 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, "cgroup 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_sigchld_event(Unit *u, pid_t pid, int code, int status) { + bool notify_dbus = true; + Service *s = SERVICE(u); + ServiceResult f; + + assert(s); + assert(pid >= 0); + + if (is_clean_exit(code, status, s->type == SERVICE_ONESHOT ? EXIT_CLEAN_COMMAND : EXIT_CLEAN_DAEMON, &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; + } + + /* When this is a successful exit, let's log about the exit code on DEBUG level. If this is a failure + * and the process exited on its own via exit(), then let's make this a NOTICE, under the assumption + * that the service already logged the reason at a higher log level on its own. (Internally, + * unit_log_process_exit() will possibly bump this to WARNING if the service died due to a signal.) */ + unit_log_process_exit( + u, f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE, + "Main process", + service_exec_command_to_string(SERVICE_EXEC_START), + 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; + + 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, f == SERVICE_SUCCESS ? LOG_DEBUG : LOG_NOTICE, + "Control process", + service_exec_command_to_string(s->control_command_id), + code, status); + + if (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_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; + + 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); + + /* If we get a SIGCHLD event for one of the processes we were interested in, then we look for others to watch, + * under the assumption that we'll sooner or later get a SIGCHLD for them, as the original process we watched + * was probably the parent of them, and they are hence now our children. */ + (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_START_PRE: + case SERVICE_START: + log_unit_warning(UNIT(s), "%s operation timed out. Terminating.", s->state == SERVICE_START ? "Start" : "Start-pre"); + 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; + + 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_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 suspicous, 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); + 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= */ + if (strv_find(tags, "WATCHDOG=1")) + service_reset_watchdog(s); + + 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 *name, + const char *old_owner, + const char *new_owner) { + + Service *s = SERVICE(u); + int r; + + assert(s); + assert(name); + + assert(streq(s->bus_name, name)); + assert(old_owner || new_owner); + + if (old_owner && new_owner) + log_unit_debug(u, "D-Bus name %s changed owner from %s to %s", name, old_owner, new_owner); + else if (old_owner) + log_unit_debug(u, "D-Bus name %s no longer registered by %s", name, old_owner); + else + log_unit_debug(u, "D-Bus name %s now registered by %s", 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, 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, name, pid); + + service_set_main_pid(s, pid); + unit_watch_pid(UNIT(s), pid); + } + } +} + +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->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_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 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_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 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", +}; + +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, + + .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_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.", + }, + .finished_stop_job = { + [JOB_DONE] = "Stopped %s.", + [JOB_FAILED] = "Stopped (with error) %s.", + }, + }, +}; |