| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * Copyright © 2004 Chris Friesen <chris_friesen@sympatico.ca> |
| * Copyright © 2009 Canonical Ltd. |
| * Copyright © 2009 Scott James Remnant <scott@netsplit.com> |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <getopt.h> |
| #include <signal.h> |
| #include <stdbool.h> |
| #include <stddef.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/epoll.h> |
| #include <sys/file.h> |
| #include <sys/inotify.h> |
| #include <sys/ioctl.h> |
| #include <sys/mount.h> |
| #include <sys/prctl.h> |
| #include <sys/signalfd.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/time.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| |
| #include "sd-daemon.h" |
| #include "sd-event.h" |
| |
| #include "alloc-util.h" |
| #include "build.h" |
| #include "cgroup-util.h" |
| #include "cpu-set-util.h" |
| #include "dev-setup.h" |
| #include "device-monitor-private.h" |
| #include "device-private.h" |
| #include "device-util.h" |
| #include "event-util.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "format-util.h" |
| #include "fs-util.h" |
| #include "hashmap.h" |
| #include "io-util.h" |
| #include "libudev-device-internal.h" |
| #include "limits-util.h" |
| #include "list.h" |
| #include "main-func.h" |
| #include "mkdir.h" |
| #include "netlink-util.h" |
| #include "parse-util.h" |
| #include "pretty-print.h" |
| #include "proc-cmdline.h" |
| #include "process-util.h" |
| #include "selinux-util.h" |
| #include "signal-util.h" |
| #include "socket-util.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "strxcpyx.h" |
| #include "syslog-util.h" |
| #include "udev-builtin.h" |
| #include "udev-ctrl.h" |
| #include "udev-event.h" |
| #include "udev-util.h" |
| #include "udev-watch.h" |
| #include "user-util.h" |
| |
| #define WORKER_NUM_MAX 2048U |
| |
| static bool arg_debug = false; |
| static int arg_daemonize = false; |
| static ResolveNameTiming arg_resolve_name_timing = RESOLVE_NAME_EARLY; |
| static unsigned arg_children_max = 0; |
| static usec_t arg_exec_delay_usec = 0; |
| static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC; |
| |
| typedef struct Manager { |
| sd_event *event; |
| Hashmap *workers; |
| LIST_HEAD(struct event, events); |
| const char *cgroup; |
| pid_t pid; /* the process that originally allocated the manager object */ |
| |
| UdevRules *rules; |
| Hashmap *properties; |
| |
| sd_netlink *rtnl; |
| |
| sd_device_monitor *monitor; |
| struct udev_ctrl *ctrl; |
| int fd_inotify; |
| int worker_watch[2]; |
| |
| sd_event_source *inotify_event; |
| sd_event_source *kill_workers_event; |
| |
| usec_t last_usec; |
| |
| bool stop_exec_queue:1; |
| bool exit:1; |
| } Manager; |
| |
| enum event_state { |
| EVENT_UNDEF, |
| EVENT_QUEUED, |
| EVENT_RUNNING, |
| }; |
| |
| struct event { |
| Manager *manager; |
| struct worker *worker; |
| enum event_state state; |
| |
| sd_device *dev; |
| sd_device *dev_kernel; /* clone of originally received device */ |
| |
| uint64_t seqnum; |
| uint64_t delaying_seqnum; |
| |
| sd_event_source *timeout_warning_event; |
| sd_event_source *timeout_event; |
| |
| LIST_FIELDS(struct event, event); |
| }; |
| |
| static void event_queue_cleanup(Manager *manager, enum event_state type); |
| |
| enum worker_state { |
| WORKER_UNDEF, |
| WORKER_RUNNING, |
| WORKER_IDLE, |
| WORKER_KILLED, |
| }; |
| |
| struct worker { |
| Manager *manager; |
| pid_t pid; |
| sd_device_monitor *monitor; |
| enum worker_state state; |
| struct event *event; |
| }; |
| |
| /* passed from worker to main process */ |
| struct worker_message { |
| }; |
| |
| static void event_free(struct event *event) { |
| if (!event) |
| return; |
| |
| assert(event->manager); |
| |
| LIST_REMOVE(event, event->manager->events, event); |
| sd_device_unref(event->dev); |
| sd_device_unref(event->dev_kernel); |
| |
| sd_event_source_unref(event->timeout_warning_event); |
| sd_event_source_unref(event->timeout_event); |
| |
| if (event->worker) |
| event->worker->event = NULL; |
| |
| /* only clean up the queue from the process that created it */ |
| if (LIST_IS_EMPTY(event->manager->events) && |
| event->manager->pid == getpid_cached()) |
| if (unlink("/run/udev/queue") < 0) |
| log_warning_errno(errno, "Failed to unlink /run/udev/queue: %m"); |
| |
| free(event); |
| } |
| |
| static void worker_free(struct worker *worker) { |
| if (!worker) |
| return; |
| |
| assert(worker->manager); |
| |
| hashmap_remove(worker->manager->workers, PID_TO_PTR(worker->pid)); |
| sd_device_monitor_unref(worker->monitor); |
| event_free(worker->event); |
| |
| free(worker); |
| } |
| |
| DEFINE_TRIVIAL_CLEANUP_FUNC(struct worker *, worker_free); |
| DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(worker_hash_op, void, trivial_hash_func, trivial_compare_func, struct worker, worker_free); |
| |
| static int worker_new(struct worker **ret, Manager *manager, sd_device_monitor *worker_monitor, pid_t pid) { |
| _cleanup_(worker_freep) struct worker *worker = NULL; |
| int r; |
| |
| assert(ret); |
| assert(manager); |
| assert(worker_monitor); |
| assert(pid > 1); |
| |
| /* close monitor, but keep address around */ |
| device_monitor_disconnect(worker_monitor); |
| |
| worker = new(struct worker, 1); |
| if (!worker) |
| return -ENOMEM; |
| |
| *worker = (struct worker) { |
| .manager = manager, |
| .monitor = sd_device_monitor_ref(worker_monitor), |
| .pid = pid, |
| }; |
| |
| r = hashmap_ensure_allocated(&manager->workers, &worker_hash_op); |
| if (r < 0) |
| return r; |
| |
| r = hashmap_put(manager->workers, PID_TO_PTR(pid), worker); |
| if (r < 0) |
| return r; |
| |
| *ret = TAKE_PTR(worker); |
| |
| return 0; |
| } |
| |
| static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
| struct event *event = userdata; |
| |
| assert(event); |
| assert(event->worker); |
| |
| kill_and_sigcont(event->worker->pid, SIGKILL); |
| event->worker->state = WORKER_KILLED; |
| |
| log_device_error(event->dev, "Worker ["PID_FMT"] processing SEQNUM=%"PRIu64" killed", event->worker->pid, event->seqnum); |
| |
| return 1; |
| } |
| |
| static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) { |
| struct event *event = userdata; |
| |
| assert(event); |
| assert(event->worker); |
| |
| log_device_warning(event->dev, "Worker ["PID_FMT"] processing SEQNUM=%"PRIu64" is taking a long time", event->worker->pid, event->seqnum); |
| |
| return 1; |
| } |
| |
| static void worker_attach_event(struct worker *worker, struct event *event) { |
| sd_event *e; |
| uint64_t usec; |
| |
| assert(worker); |
| assert(worker->manager); |
| assert(event); |
| assert(!event->worker); |
| assert(!worker->event); |
| |
| worker->state = WORKER_RUNNING; |
| worker->event = event; |
| event->state = EVENT_RUNNING; |
| event->worker = worker; |
| |
| e = worker->manager->event; |
| |
| assert_se(sd_event_now(e, CLOCK_MONOTONIC, &usec) >= 0); |
| |
| (void) sd_event_add_time(e, &event->timeout_warning_event, CLOCK_MONOTONIC, |
| usec + udev_warn_timeout(arg_event_timeout_usec), USEC_PER_SEC, on_event_timeout_warning, event); |
| |
| (void) sd_event_add_time(e, &event->timeout_event, CLOCK_MONOTONIC, |
| usec + arg_event_timeout_usec, USEC_PER_SEC, on_event_timeout, event); |
| } |
| |
| static void manager_clear_for_worker(Manager *manager) { |
| assert(manager); |
| |
| manager->inotify_event = sd_event_source_unref(manager->inotify_event); |
| manager->kill_workers_event = sd_event_source_unref(manager->kill_workers_event); |
| |
| manager->event = sd_event_unref(manager->event); |
| |
| manager->workers = hashmap_free(manager->workers); |
| event_queue_cleanup(manager, EVENT_UNDEF); |
| |
| manager->monitor = sd_device_monitor_unref(manager->monitor); |
| manager->ctrl = udev_ctrl_unref(manager->ctrl); |
| |
| manager->worker_watch[READ_END] = safe_close(manager->worker_watch[READ_END]); |
| } |
| |
| static void manager_free(Manager *manager) { |
| if (!manager) |
| return; |
| |
| udev_builtin_exit(); |
| |
| if (manager->pid == getpid_cached()) |
| udev_ctrl_cleanup(manager->ctrl); |
| |
| manager_clear_for_worker(manager); |
| |
| sd_netlink_unref(manager->rtnl); |
| |
| hashmap_free_free_free(manager->properties); |
| udev_rules_free(manager->rules); |
| |
| safe_close(manager->fd_inotify); |
| safe_close_pair(manager->worker_watch); |
| |
| free(manager); |
| } |
| |
| DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); |
| |
| static int worker_send_message(int fd) { |
| struct worker_message message = {}; |
| |
| return loop_write(fd, &message, sizeof(message), false); |
| } |
| |
| static int worker_lock_block_device(sd_device *dev, int *ret_fd) { |
| _cleanup_close_ int fd = -1; |
| const char *val; |
| int r; |
| |
| assert(dev); |
| assert(ret_fd); |
| |
| /* |
| * Take a shared lock on the device node; this establishes |
| * a concept of device "ownership" to serialize device |
| * access. External processes holding an exclusive lock will |
| * cause udev to skip the event handling; in the case udev |
| * acquired the lock, the external process can block until |
| * udev has finished its event handling. |
| */ |
| |
| if (device_for_action(dev, DEVICE_ACTION_REMOVE)) |
| return 0; |
| |
| r = sd_device_get_subsystem(dev, &val); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get subsystem: %m"); |
| |
| if (!streq(val, "block")) |
| return 0; |
| |
| r = sd_device_get_sysname(dev, &val); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get sysname: %m"); |
| |
| if (STARTSWITH_SET(val, "dm-", "md", "drbd")) |
| return 0; |
| |
| r = sd_device_get_devtype(dev, &val); |
| if (r < 0 && r != -ENOENT) |
| return log_device_debug_errno(dev, r, "Failed to get devtype: %m"); |
| if (r >= 0 && streq(val, "partition")) { |
| r = sd_device_get_parent(dev, &dev); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get parent device: %m"); |
| } |
| |
| r = sd_device_get_devname(dev, &val); |
| if (r == -ENOENT) |
| return 0; |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get devname: %m"); |
| |
| fd = open(val, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); |
| if (fd < 0) { |
| log_device_debug_errno(dev, errno, "Failed to open '%s', ignoring: %m", val); |
| return 0; |
| } |
| |
| if (flock(fd, LOCK_SH|LOCK_NB) < 0) |
| return log_device_debug_errno(dev, errno, "Failed to flock(%s): %m", val); |
| |
| *ret_fd = TAKE_FD(fd); |
| return 1; |
| } |
| |
| static int worker_process_device(Manager *manager, sd_device *dev) { |
| _cleanup_(udev_event_freep) UdevEvent *udev_event = NULL; |
| _cleanup_close_ int fd_lock = -1; |
| DeviceAction action; |
| uint64_t seqnum; |
| int r; |
| |
| assert(manager); |
| assert(dev); |
| |
| r = device_get_seqnum(dev, &seqnum); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get SEQNUM: %m"); |
| |
| r = device_get_action(dev, &action); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get ACTION: %m"); |
| |
| log_device_debug(dev, "Processing device (SEQNUM=%"PRIu64", ACTION=%s)", |
| seqnum, device_action_to_string(action)); |
| |
| udev_event = udev_event_new(dev, arg_exec_delay_usec, manager->rtnl); |
| if (!udev_event) |
| return -ENOMEM; |
| |
| r = worker_lock_block_device(dev, &fd_lock); |
| if (r < 0) |
| return r; |
| |
| /* apply rules, create node, symlinks */ |
| r = udev_event_execute_rules(udev_event, arg_event_timeout_usec, manager->properties, manager->rules); |
| if (r < 0) |
| return r; |
| |
| udev_event_execute_run(udev_event, arg_event_timeout_usec); |
| |
| if (!manager->rtnl) |
| /* in case rtnl was initialized */ |
| manager->rtnl = sd_netlink_ref(udev_event->rtnl); |
| |
| /* apply/restore inotify watch */ |
| if (udev_event->inotify_watch) { |
| (void) udev_watch_begin(dev); |
| r = device_update_db(dev); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to update database under /run/udev/data/: %m"); |
| } |
| |
| log_device_debug(dev, "Device (SEQNUM=%"PRIu64", ACTION=%s) processed", |
| seqnum, device_action_to_string(action)); |
| |
| return 0; |
| } |
| |
| static int worker_device_monitor_handler(sd_device_monitor *monitor, sd_device *dev, void *userdata) { |
| Manager *manager = userdata; |
| int r; |
| |
| assert(dev); |
| assert(manager); |
| |
| r = worker_process_device(manager, dev); |
| if (r < 0) |
| log_device_warning_errno(dev, r, "Failed to process device, ignoring: %m"); |
| |
| /* send processed event back to libudev listeners */ |
| r = device_monitor_send_device(monitor, NULL, dev); |
| if (r < 0) |
| log_device_warning_errno(dev, r, "Failed to send device, ignoring: %m"); |
| |
| /* send udevd the result of the event execution */ |
| r = worker_send_message(manager->worker_watch[WRITE_END]); |
| if (r < 0) |
| log_device_warning_errno(dev, r, "Failed to send signal to main daemon, ignoring: %m"); |
| |
| return 1; |
| } |
| |
| static int worker_main(Manager *_manager, sd_device_monitor *monitor, sd_device *first_device) { |
| _cleanup_(sd_device_unrefp) sd_device *dev = first_device; |
| _cleanup_(manager_freep) Manager *manager = _manager; |
| int r; |
| |
| assert(manager); |
| assert(monitor); |
| assert(dev); |
| |
| unsetenv("NOTIFY_SOCKET"); |
| |
| assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, -1) >= 0); |
| |
| /* Reset OOM score, we only protect the main daemon. */ |
| r = set_oom_score_adjust(0); |
| if (r < 0) |
| log_debug_errno(r, "Failed to reset OOM score, ignoring: %m"); |
| |
| /* Clear unnecessary data in Manager object.*/ |
| manager_clear_for_worker(manager); |
| |
| r = sd_event_new(&manager->event); |
| if (r < 0) |
| return log_error_errno(r, "Failed to allocate event loop: %m"); |
| |
| r = sd_event_add_signal(manager->event, NULL, SIGTERM, NULL, NULL); |
| if (r < 0) |
| return log_error_errno(r, "Failed to set SIGTERM event: %m"); |
| |
| r = sd_device_monitor_attach_event(monitor, manager->event); |
| if (r < 0) |
| return log_error_errno(r, "Failed to attach event loop to device monitor: %m"); |
| |
| r = sd_device_monitor_start(monitor, worker_device_monitor_handler, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to start device monitor: %m"); |
| |
| (void) sd_event_source_set_description(sd_device_monitor_get_event_source(monitor), "worker-device-monitor"); |
| |
| /* Process first device */ |
| (void) worker_device_monitor_handler(monitor, dev, manager); |
| |
| r = sd_event_loop(manager->event); |
| if (r < 0) |
| return log_error_errno(r, "Event loop failed: %m"); |
| |
| return 0; |
| } |
| |
| static int worker_spawn(Manager *manager, struct event *event) { |
| _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *worker_monitor = NULL; |
| struct worker *worker; |
| pid_t pid; |
| int r; |
| |
| /* listen for new events */ |
| r = device_monitor_new_full(&worker_monitor, MONITOR_GROUP_NONE, -1); |
| if (r < 0) |
| return r; |
| |
| /* allow the main daemon netlink address to send devices to the worker */ |
| r = device_monitor_allow_unicast_sender(worker_monitor, manager->monitor); |
| if (r < 0) |
| return log_error_errno(r, "Worker: Failed to set unicast sender: %m"); |
| |
| r = device_monitor_enable_receiving(worker_monitor); |
| if (r < 0) |
| return log_error_errno(r, "Worker: Failed to enable receiving of device: %m"); |
| |
| r = safe_fork(NULL, FORK_DEATHSIG, &pid); |
| if (r < 0) { |
| event->state = EVENT_QUEUED; |
| return log_error_errno(r, "Failed to fork() worker: %m"); |
| } |
| if (r == 0) { |
| /* Worker process */ |
| r = worker_main(manager, worker_monitor, sd_device_ref(event->dev)); |
| log_close(); |
| _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
| } |
| |
| r = worker_new(&worker, manager, worker_monitor, pid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create worker object: %m"); |
| |
| worker_attach_event(worker, event); |
| |
| log_device_debug(event->dev, "Worker ["PID_FMT"] is forked for processing SEQNUM=%"PRIu64".", pid, event->seqnum); |
| return 0; |
| } |
| |
| static void event_run(Manager *manager, struct event *event) { |
| static bool log_children_max_reached = true; |
| struct worker *worker; |
| Iterator i; |
| int r; |
| |
| assert(manager); |
| assert(event); |
| |
| HASHMAP_FOREACH(worker, manager->workers, i) { |
| if (worker->state != WORKER_IDLE) |
| continue; |
| |
| r = device_monitor_send_device(manager->monitor, worker->monitor, event->dev); |
| if (r < 0) { |
| log_device_error_errno(event->dev, r, "Worker ["PID_FMT"] did not accept message, killing the worker: %m", |
| worker->pid); |
| (void) kill(worker->pid, SIGKILL); |
| worker->state = WORKER_KILLED; |
| continue; |
| } |
| worker_attach_event(worker, event); |
| return; |
| } |
| |
| if (hashmap_size(manager->workers) >= arg_children_max) { |
| |
| /* Avoid spamming the debug logs if the limit is already reached and |
| * many events still need to be processed */ |
| if (log_children_max_reached && arg_children_max > 1) { |
| log_debug("Maximum number (%u) of children reached.", hashmap_size(manager->workers)); |
| log_children_max_reached = false; |
| } |
| return; |
| } |
| |
| /* Re-enable the debug message for the next batch of events */ |
| log_children_max_reached = true; |
| |
| /* start new worker and pass initial device */ |
| worker_spawn(manager, event); |
| } |
| |
| static int event_queue_insert(Manager *manager, sd_device *dev) { |
| _cleanup_(sd_device_unrefp) sd_device *clone = NULL; |
| struct event *event; |
| DeviceAction action; |
| uint64_t seqnum; |
| int r; |
| |
| assert(manager); |
| assert(dev); |
| |
| /* only one process can add events to the queue */ |
| assert(manager->pid == getpid_cached()); |
| |
| /* We only accepts devices received by device monitor. */ |
| r = device_get_seqnum(dev, &seqnum); |
| if (r < 0) |
| return r; |
| |
| /* Refuse devices do not have ACTION property. */ |
| r = device_get_action(dev, &action); |
| if (r < 0) |
| return r; |
| |
| /* Save original device to restore the state on failures. */ |
| r = device_shallow_clone(dev, &clone); |
| if (r < 0) |
| return r; |
| |
| r = device_copy_properties(clone, dev); |
| if (r < 0) |
| return r; |
| |
| event = new(struct event, 1); |
| if (!event) |
| return -ENOMEM; |
| |
| *event = (struct event) { |
| .manager = manager, |
| .dev = sd_device_ref(dev), |
| .dev_kernel = TAKE_PTR(clone), |
| .seqnum = seqnum, |
| .state = EVENT_QUEUED, |
| }; |
| |
| if (LIST_IS_EMPTY(manager->events)) { |
| r = touch("/run/udev/queue"); |
| if (r < 0) |
| log_warning_errno(r, "Failed to touch /run/udev/queue: %m"); |
| } |
| |
| LIST_APPEND(event, manager->events, event); |
| |
| log_device_debug(dev, "Device (SEQNUM=%"PRIu64", ACTION=%s) is queued", |
| seqnum, device_action_to_string(action)); |
| |
| return 0; |
| } |
| |
| static void manager_kill_workers(Manager *manager) { |
| struct worker *worker; |
| Iterator i; |
| |
| assert(manager); |
| |
| HASHMAP_FOREACH(worker, manager->workers, i) { |
| if (worker->state == WORKER_KILLED) |
| continue; |
| |
| worker->state = WORKER_KILLED; |
| (void) kill(worker->pid, SIGTERM); |
| } |
| } |
| |
| /* lookup event for identical, parent, child device */ |
| static int is_device_busy(Manager *manager, struct event *event) { |
| const char *subsystem, *devpath, *devpath_old = NULL; |
| dev_t devnum = makedev(0, 0); |
| struct event *loop_event; |
| size_t devpath_len; |
| int r, ifindex = 0; |
| bool is_block; |
| |
| r = sd_device_get_subsystem(event->dev, &subsystem); |
| if (r < 0) |
| return r; |
| |
| is_block = streq(subsystem, "block"); |
| |
| r = sd_device_get_devpath(event->dev, &devpath); |
| if (r < 0) |
| return r; |
| |
| devpath_len = strlen(devpath); |
| |
| r = sd_device_get_property_value(event->dev, "DEVPATH_OLD", &devpath_old); |
| if (r < 0 && r != -ENOENT) |
| return r; |
| |
| r = sd_device_get_devnum(event->dev, &devnum); |
| if (r < 0 && r != -ENOENT) |
| return r; |
| |
| r = sd_device_get_ifindex(event->dev, &ifindex); |
| if (r < 0 && r != -ENOENT) |
| return r; |
| |
| /* check if queue contains events we depend on */ |
| LIST_FOREACH(event, loop_event, manager->events) { |
| size_t loop_devpath_len, common; |
| const char *loop_devpath; |
| |
| /* we already found a later event, earlier cannot block us, no need to check again */ |
| if (loop_event->seqnum < event->delaying_seqnum) |
| continue; |
| |
| /* event we checked earlier still exists, no need to check again */ |
| if (loop_event->seqnum == event->delaying_seqnum) |
| return true; |
| |
| /* found ourself, no later event can block us */ |
| if (loop_event->seqnum >= event->seqnum) |
| break; |
| |
| /* check major/minor */ |
| if (major(devnum) != 0) { |
| const char *s; |
| dev_t d; |
| |
| if (sd_device_get_subsystem(loop_event->dev, &s) < 0) |
| continue; |
| |
| if (sd_device_get_devnum(loop_event->dev, &d) >= 0 && |
| devnum == d && is_block == streq(s, "block")) |
| goto set_delaying_seqnum; |
| } |
| |
| /* check network device ifindex */ |
| if (ifindex > 0) { |
| int i; |
| |
| if (sd_device_get_ifindex(loop_event->dev, &i) >= 0 && |
| ifindex == i) |
| goto set_delaying_seqnum; |
| } |
| |
| if (sd_device_get_devpath(loop_event->dev, &loop_devpath) < 0) |
| continue; |
| |
| /* check our old name */ |
| if (devpath_old && streq(devpath_old, loop_devpath)) |
| goto set_delaying_seqnum; |
| |
| loop_devpath_len = strlen(loop_devpath); |
| |
| /* compare devpath */ |
| common = MIN(devpath_len, loop_devpath_len); |
| |
| /* one devpath is contained in the other? */ |
| if (!strneq(devpath, loop_devpath, common)) |
| continue; |
| |
| /* identical device event found */ |
| if (devpath_len == loop_devpath_len) |
| goto set_delaying_seqnum; |
| |
| /* parent device event found */ |
| if (devpath[common] == '/') |
| goto set_delaying_seqnum; |
| |
| /* child device event found */ |
| if (loop_devpath[common] == '/') |
| goto set_delaying_seqnum; |
| } |
| |
| return false; |
| |
| set_delaying_seqnum: |
| event->delaying_seqnum = loop_event->seqnum; |
| return true; |
| } |
| |
| static int on_exit_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
| Manager *manager = userdata; |
| |
| assert(manager); |
| |
| log_error("Giving up waiting for workers to finish."); |
| sd_event_exit(manager->event, -ETIMEDOUT); |
| |
| return 1; |
| } |
| |
| static void manager_exit(Manager *manager) { |
| uint64_t usec; |
| int r; |
| |
| assert(manager); |
| |
| manager->exit = true; |
| |
| sd_notify(false, |
| "STOPPING=1\n" |
| "STATUS=Starting shutdown..."); |
| |
| /* close sources of new events and discard buffered events */ |
| manager->ctrl = udev_ctrl_unref(manager->ctrl); |
| |
| manager->inotify_event = sd_event_source_unref(manager->inotify_event); |
| manager->fd_inotify = safe_close(manager->fd_inotify); |
| |
| manager->monitor = sd_device_monitor_unref(manager->monitor); |
| |
| /* discard queued events and kill workers */ |
| event_queue_cleanup(manager, EVENT_QUEUED); |
| manager_kill_workers(manager); |
| |
| assert_se(sd_event_now(manager->event, CLOCK_MONOTONIC, &usec) >= 0); |
| |
| r = sd_event_add_time(manager->event, NULL, CLOCK_MONOTONIC, |
| usec + 30 * USEC_PER_SEC, USEC_PER_SEC, on_exit_timeout, manager); |
| if (r < 0) |
| return; |
| } |
| |
| /* reload requested, HUP signal received, rules changed, builtin changed */ |
| static void manager_reload(Manager *manager) { |
| |
| assert(manager); |
| |
| sd_notify(false, |
| "RELOADING=1\n" |
| "STATUS=Flushing configuration..."); |
| |
| manager_kill_workers(manager); |
| manager->rules = udev_rules_free(manager->rules); |
| udev_builtin_exit(); |
| |
| sd_notifyf(false, |
| "READY=1\n" |
| "STATUS=Processing with %u children at max", arg_children_max); |
| } |
| |
| static int on_kill_workers_event(sd_event_source *s, uint64_t usec, void *userdata) { |
| Manager *manager = userdata; |
| |
| assert(manager); |
| |
| log_debug("Cleanup idle workers"); |
| manager_kill_workers(manager); |
| |
| return 1; |
| } |
| |
| static void event_queue_start(Manager *manager) { |
| struct event *event; |
| usec_t usec; |
| int r; |
| |
| assert(manager); |
| |
| if (LIST_IS_EMPTY(manager->events) || |
| manager->exit || manager->stop_exec_queue) |
| return; |
| |
| assert_se(sd_event_now(manager->event, CLOCK_MONOTONIC, &usec) >= 0); |
| /* check for changed config, every 3 seconds at most */ |
| if (manager->last_usec == 0 || |
| usec - manager->last_usec > 3 * USEC_PER_SEC) { |
| if (udev_rules_check_timestamp(manager->rules) || |
| udev_builtin_validate()) |
| manager_reload(manager); |
| |
| manager->last_usec = usec; |
| } |
| |
| r = event_source_disable(manager->kill_workers_event); |
| if (r < 0) |
| log_warning_errno(r, "Failed to disable event source for cleaning up idle workers, ignoring: %m"); |
| |
| udev_builtin_init(); |
| |
| if (!manager->rules) { |
| r = udev_rules_new(&manager->rules, arg_resolve_name_timing); |
| if (r < 0) { |
| log_warning_errno(r, "Failed to read udev rules: %m"); |
| return; |
| } |
| } |
| |
| LIST_FOREACH(event, event, manager->events) { |
| if (event->state != EVENT_QUEUED) |
| continue; |
| |
| /* do not start event if parent or child event is still running */ |
| if (is_device_busy(manager, event) != 0) |
| continue; |
| |
| event_run(manager, event); |
| } |
| } |
| |
| static void event_queue_cleanup(Manager *manager, enum event_state match_type) { |
| struct event *event, *tmp; |
| |
| LIST_FOREACH_SAFE(event, event, tmp, manager->events) { |
| if (match_type != EVENT_UNDEF && match_type != event->state) |
| continue; |
| |
| event_free(event); |
| } |
| } |
| |
| static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
| Manager *manager = userdata; |
| |
| assert(manager); |
| |
| for (;;) { |
| struct worker_message msg; |
| struct iovec iovec = { |
| .iov_base = &msg, |
| .iov_len = sizeof(msg), |
| }; |
| union { |
| struct cmsghdr cmsghdr; |
| uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; |
| } control = {}; |
| struct msghdr msghdr = { |
| .msg_iov = &iovec, |
| .msg_iovlen = 1, |
| .msg_control = &control, |
| .msg_controllen = sizeof(control), |
| }; |
| struct cmsghdr *cmsg; |
| ssize_t size; |
| struct ucred *ucred = NULL; |
| struct worker *worker; |
| |
| size = recvmsg(fd, &msghdr, MSG_DONTWAIT); |
| if (size < 0) { |
| if (errno == EINTR) |
| continue; |
| else if (errno == EAGAIN) |
| /* nothing more to read */ |
| break; |
| |
| return log_error_errno(errno, "Failed to receive message: %m"); |
| } else if (size != sizeof(struct worker_message)) { |
| log_warning("Ignoring worker message with invalid size %zi bytes", size); |
| continue; |
| } |
| |
| CMSG_FOREACH(cmsg, &msghdr) |
| if (cmsg->cmsg_level == SOL_SOCKET && |
| cmsg->cmsg_type == SCM_CREDENTIALS && |
| cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) |
| ucred = (struct ucred*) CMSG_DATA(cmsg); |
| |
| if (!ucred || ucred->pid <= 0) { |
| log_warning("Ignoring worker message without valid PID"); |
| continue; |
| } |
| |
| /* lookup worker who sent the signal */ |
| worker = hashmap_get(manager->workers, PID_TO_PTR(ucred->pid)); |
| if (!worker) { |
| log_debug("Worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid); |
| continue; |
| } |
| |
| if (worker->state != WORKER_KILLED) |
| worker->state = WORKER_IDLE; |
| |
| /* worker returned */ |
| event_free(worker->event); |
| } |
| |
| /* we have free workers, try to schedule events */ |
| event_queue_start(manager); |
| |
| return 1; |
| } |
| |
| static int on_uevent(sd_device_monitor *monitor, sd_device *dev, void *userdata) { |
| Manager *manager = userdata; |
| int r; |
| |
| assert(manager); |
| |
| device_ensure_usec_initialized(dev, NULL); |
| |
| r = event_queue_insert(manager, dev); |
| if (r < 0) { |
| log_device_error_errno(dev, r, "Failed to insert device into event queue: %m"); |
| return 1; |
| } |
| |
| /* we have fresh events, try to schedule them */ |
| event_queue_start(manager); |
| |
| return 1; |
| } |
| |
| /* receive the udevd message from userspace */ |
| static int on_ctrl_msg(struct udev_ctrl *uctrl, enum udev_ctrl_msg_type type, const union udev_ctrl_msg_value *value, void *userdata) { |
| Manager *manager = userdata; |
| int r; |
| |
| assert(value); |
| assert(manager); |
| |
| switch (type) { |
| case UDEV_CTRL_SET_LOG_LEVEL: |
| log_debug("Received udev control message (SET_LOG_LEVEL), setting log_priority=%i", value->intval); |
| log_set_max_level_realm(LOG_REALM_UDEV, value->intval); |
| log_set_max_level_realm(LOG_REALM_SYSTEMD, value->intval); |
| manager_kill_workers(manager); |
| break; |
| case UDEV_CTRL_STOP_EXEC_QUEUE: |
| log_debug("Received udev control message (STOP_EXEC_QUEUE)"); |
| manager->stop_exec_queue = true; |
| break; |
| case UDEV_CTRL_START_EXEC_QUEUE: |
| log_debug("Received udev control message (START_EXEC_QUEUE)"); |
| manager->stop_exec_queue = false; |
| event_queue_start(manager); |
| break; |
| case UDEV_CTRL_RELOAD: |
| log_debug("Received udev control message (RELOAD)"); |
| manager_reload(manager); |
| break; |
| case UDEV_CTRL_SET_ENV: { |
| _cleanup_free_ char *key = NULL, *val = NULL, *old_key = NULL, *old_val = NULL; |
| const char *eq; |
| |
| eq = strchr(value->buf, '='); |
| if (!eq) { |
| log_error("Invalid key format '%s'", value->buf); |
| return 1; |
| } |
| |
| key = strndup(value->buf, eq - value->buf); |
| if (!key) { |
| log_oom(); |
| return 1; |
| } |
| |
| old_val = hashmap_remove2(manager->properties, key, (void **) &old_key); |
| |
| r = hashmap_ensure_allocated(&manager->properties, &string_hash_ops); |
| if (r < 0) { |
| log_oom(); |
| return 1; |
| } |
| |
| eq++; |
| if (isempty(eq)) { |
| log_debug("Received udev control message (ENV), unsetting '%s'", key); |
| |
| r = hashmap_put(manager->properties, key, NULL); |
| if (r < 0) { |
| log_oom(); |
| return 1; |
| } |
| } else { |
| val = strdup(eq); |
| if (!val) { |
| log_oom(); |
| return 1; |
| } |
| |
| log_debug("Received udev control message (ENV), setting '%s=%s'", key, val); |
| |
| r = hashmap_put(manager->properties, key, val); |
| if (r < 0) { |
| log_oom(); |
| return 1; |
| } |
| } |
| |
| key = val = NULL; |
| manager_kill_workers(manager); |
| break; |
| } |
| case UDEV_CTRL_SET_CHILDREN_MAX: |
| if (value->intval <= 0) { |
| log_debug("Received invalid udev control message (SET_MAX_CHILDREN, %i), ignoring.", value->intval); |
| return 0; |
| } |
| |
| log_debug("Received udev control message (SET_MAX_CHILDREN), setting children_max=%i", value->intval); |
| arg_children_max = value->intval; |
| |
| (void) sd_notifyf(false, |
| "READY=1\n" |
| "STATUS=Processing with %u children at max", arg_children_max); |
| break; |
| case UDEV_CTRL_PING: |
| log_debug("Received udev control message (PING)"); |
| break; |
| case UDEV_CTRL_EXIT: |
| log_debug("Received udev control message (EXIT)"); |
| manager_exit(manager); |
| break; |
| default: |
| log_debug("Received unknown udev control message, ignoring"); |
| } |
| |
| return 1; |
| } |
| |
| static int synthesize_change_one(sd_device *dev, const char *syspath) { |
| const char *filename; |
| int r; |
| |
| filename = strjoina(syspath, "/uevent"); |
| log_device_debug(dev, "device is closed, synthesising 'change' on %s", syspath); |
| r = write_string_file(filename, "change", WRITE_STRING_FILE_DISABLE_BUFFER); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to write 'change' to %s: %m", filename); |
| return 0; |
| } |
| |
| static int synthesize_change(sd_device *dev) { |
| const char *subsystem, *sysname, *devname, *syspath, *devtype; |
| int r; |
| |
| r = sd_device_get_subsystem(dev, &subsystem); |
| if (r < 0) |
| return r; |
| |
| r = sd_device_get_sysname(dev, &sysname); |
| if (r < 0) |
| return r; |
| |
| r = sd_device_get_devname(dev, &devname); |
| if (r < 0) |
| return r; |
| |
| r = sd_device_get_syspath(dev, &syspath); |
| if (r < 0) |
| return r; |
| |
| r = sd_device_get_devtype(dev, &devtype); |
| if (r < 0) |
| return r; |
| |
| if (streq_ptr("block", subsystem) && |
| streq_ptr("disk", devtype) && |
| !startswith(sysname, "dm-")) { |
| _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; |
| bool part_table_read = false, has_partitions = false; |
| sd_device *d; |
| int fd; |
| |
| /* |
| * Try to re-read the partition table. This only succeeds if |
| * none of the devices is busy. The kernel returns 0 if no |
| * partition table is found, and we will not get an event for |
| * the disk. |
| */ |
| fd = open(devname, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); |
| if (fd >= 0) { |
| r = flock(fd, LOCK_EX|LOCK_NB); |
| if (r >= 0) |
| r = ioctl(fd, BLKRRPART, 0); |
| |
| close(fd); |
| if (r >= 0) |
| part_table_read = true; |
| } |
| |
| /* search for partitions */ |
| r = sd_device_enumerator_new(&e); |
| if (r < 0) |
| return r; |
| |
| r = sd_device_enumerator_allow_uninitialized(e); |
| if (r < 0) |
| return r; |
| |
| r = sd_device_enumerator_add_match_parent(e, dev); |
| if (r < 0) |
| return r; |
| |
| r = sd_device_enumerator_add_match_subsystem(e, "block", true); |
| if (r < 0) |
| return r; |
| |
| FOREACH_DEVICE(e, d) { |
| const char *t; |
| |
| if (sd_device_get_devtype(d, &t) < 0 || |
| !streq("partition", t)) |
| continue; |
| |
| has_partitions = true; |
| break; |
| } |
| |
| /* |
| * We have partitions and re-read the table, the kernel already sent |
| * out a "change" event for the disk, and "remove/add" for all |
| * partitions. |
| */ |
| if (part_table_read && has_partitions) |
| return 0; |
| |
| /* |
| * We have partitions but re-reading the partition table did not |
| * work, synthesize "change" for the disk and all partitions. |
| */ |
| (void) synthesize_change_one(dev, syspath); |
| |
| FOREACH_DEVICE(e, d) { |
| const char *t, *n, *s; |
| |
| if (sd_device_get_devtype(d, &t) < 0 || |
| !streq("partition", t)) |
| continue; |
| |
| if (sd_device_get_devname(d, &n) < 0 || |
| sd_device_get_syspath(d, &s) < 0) |
| continue; |
| |
| (void) synthesize_change_one(dev, s); |
| } |
| |
| } else |
| (void) synthesize_change_one(dev, syspath); |
| |
| return 0; |
| } |
| |
| static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
| Manager *manager = userdata; |
| union inotify_event_buffer buffer; |
| struct inotify_event *e; |
| ssize_t l; |
| int r; |
| |
| assert(manager); |
| |
| r = event_source_disable(manager->kill_workers_event); |
| if (r < 0) |
| log_warning_errno(r, "Failed to disable event source for cleaning up idle workers, ignoring: %m"); |
| |
| l = read(fd, &buffer, sizeof(buffer)); |
| if (l < 0) { |
| if (IN_SET(errno, EAGAIN, EINTR)) |
| return 1; |
| |
| return log_error_errno(errno, "Failed to read inotify fd: %m"); |
| } |
| |
| FOREACH_INOTIFY_EVENT(e, buffer, l) { |
| _cleanup_(sd_device_unrefp) sd_device *dev = NULL; |
| const char *devnode; |
| |
| if (udev_watch_lookup(e->wd, &dev) <= 0) |
| continue; |
| |
| if (sd_device_get_devname(dev, &devnode) < 0) |
| continue; |
| |
| log_device_debug(dev, "Inotify event: %x for %s", e->mask, devnode); |
| if (e->mask & IN_CLOSE_WRITE) |
| synthesize_change(dev); |
| else if (e->mask & IN_IGNORED) |
| udev_watch_end(dev); |
| } |
| |
| return 1; |
| } |
| |
| static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
| Manager *manager = userdata; |
| |
| assert(manager); |
| |
| manager_exit(manager); |
| |
| return 1; |
| } |
| |
| static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
| Manager *manager = userdata; |
| |
| assert(manager); |
| |
| manager_reload(manager); |
| |
| return 1; |
| } |
| |
| static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
| Manager *manager = userdata; |
| int r; |
| |
| assert(manager); |
| |
| for (;;) { |
| pid_t pid; |
| int status; |
| struct worker *worker; |
| |
| pid = waitpid(-1, &status, WNOHANG); |
| if (pid <= 0) |
| break; |
| |
| worker = hashmap_get(manager->workers, PID_TO_PTR(pid)); |
| if (!worker) { |
| log_warning("Worker ["PID_FMT"] is unknown, ignoring", pid); |
| continue; |
| } |
| |
| if (WIFEXITED(status)) { |
| if (WEXITSTATUS(status) == 0) |
| log_debug("Worker ["PID_FMT"] exited", pid); |
| else |
| log_warning("Worker ["PID_FMT"] exited with return code %i", pid, WEXITSTATUS(status)); |
| } else if (WIFSIGNALED(status)) |
| log_warning("Worker ["PID_FMT"] terminated by signal %i (%s)", pid, WTERMSIG(status), signal_to_string(WTERMSIG(status))); |
| else if (WIFSTOPPED(status)) { |
| log_info("Worker ["PID_FMT"] stopped", pid); |
| continue; |
| } else if (WIFCONTINUED(status)) { |
| log_info("Worker ["PID_FMT"] continued", pid); |
| continue; |
| } else |
| log_warning("Worker ["PID_FMT"] exit with status 0x%04x", pid, status); |
| |
| if ((!WIFEXITED(status) || WEXITSTATUS(status) != 0) && worker->event) { |
| log_device_error(worker->event->dev, "Worker ["PID_FMT"] failed", pid); |
| |
| /* delete state from disk */ |
| device_delete_db(worker->event->dev); |
| device_tag_index(worker->event->dev, NULL, false); |
| |
| if (manager->monitor) { |
| /* forward kernel event without amending it */ |
| r = device_monitor_send_device(manager->monitor, NULL, worker->event->dev_kernel); |
| if (r < 0) |
| log_device_error_errno(worker->event->dev_kernel, r, "Failed to send back device to kernel: %m"); |
| } |
| } |
| |
| worker_free(worker); |
| } |
| |
| /* we can start new workers, try to schedule events */ |
| event_queue_start(manager); |
| |
| /* Disable unnecessary cleanup event */ |
| if (hashmap_isempty(manager->workers)) { |
| r = event_source_disable(manager->kill_workers_event); |
| if (r < 0) |
| log_warning_errno(r, "Failed to disable event source for cleaning up idle workers, ignoring: %m"); |
| } |
| |
| return 1; |
| } |
| |
| static int on_post(sd_event_source *s, void *userdata) { |
| Manager *manager = userdata; |
| |
| assert(manager); |
| |
| if (!LIST_IS_EMPTY(manager->events)) |
| return 1; |
| |
| /* There are no pending events. Let's cleanup idle process. */ |
| |
| if (!hashmap_isempty(manager->workers)) { |
| /* There are idle workers */ |
| (void) event_reset_time(manager->event, &manager->kill_workers_event, CLOCK_MONOTONIC, |
| now(CLOCK_MONOTONIC) + 3 * USEC_PER_SEC, USEC_PER_SEC, |
| on_kill_workers_event, manager, 0, "kill-workers-event", false); |
| return 1; |
| } |
| |
| /* There are no idle workers. */ |
| |
| if (manager->exit) |
| return sd_event_exit(manager->event, 0); |
| |
| if (manager->cgroup) |
| /* cleanup possible left-over processes in our cgroup */ |
| (void) cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, CGROUP_IGNORE_SELF, NULL, NULL, NULL); |
| |
| return 1; |
| } |
| |
| static int listen_fds(int *ret_ctrl, int *ret_netlink) { |
| int ctrl_fd = -1, netlink_fd = -1; |
| int fd, n; |
| |
| assert(ret_ctrl); |
| assert(ret_netlink); |
| |
| n = sd_listen_fds(true); |
| if (n < 0) |
| return n; |
| |
| for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { |
| if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1) > 0) { |
| if (ctrl_fd >= 0) |
| return -EINVAL; |
| ctrl_fd = fd; |
| continue; |
| } |
| |
| if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) { |
| if (netlink_fd >= 0) |
| return -EINVAL; |
| netlink_fd = fd; |
| continue; |
| } |
| |
| return -EINVAL; |
| } |
| |
| *ret_ctrl = ctrl_fd; |
| *ret_netlink = netlink_fd; |
| |
| return 0; |
| } |
| |
| /* |
| * read the kernel command line, in case we need to get into debug mode |
| * udev.log_priority=<level> syslog priority |
| * udev.children_max=<number of workers> events are fully serialized if set to 1 |
| * udev.exec_delay=<number of seconds> delay execution of every executed program |
| * udev.event_timeout=<number of seconds> seconds to wait before terminating an event |
| */ |
| static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
| int r = 0; |
| |
| assert(key); |
| |
| if (!value) |
| return 0; |
| |
| if (proc_cmdline_key_streq(key, "udev.log_priority")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| r = log_level_from_string(value); |
| if (r >= 0) |
| log_set_max_level(r); |
| |
| } else if (proc_cmdline_key_streq(key, "udev.event_timeout")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| r = parse_sec(value, &arg_event_timeout_usec); |
| |
| } else if (proc_cmdline_key_streq(key, "udev.children_max")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| r = safe_atou(value, &arg_children_max); |
| |
| } else if (proc_cmdline_key_streq(key, "udev.exec_delay")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| r = parse_sec(value, &arg_exec_delay_usec); |
| |
| } else if (startswith(key, "udev.")) |
| log_warning("Unknown udev kernel command line option \"%s\", ignoring", key); |
| |
| if (r < 0) |
| log_warning_errno(r, "Failed to parse \"%s=%s\", ignoring: %m", key, value); |
| |
| return 0; |
| } |
| |
| static int help(void) { |
| _cleanup_free_ char *link = NULL; |
| int r; |
| |
| r = terminal_urlify_man("systemd-udevd.service", "8", &link); |
| if (r < 0) |
| return log_oom(); |
| |
| printf("%s [OPTIONS...]\n\n" |
| "Manages devices.\n\n" |
| " -h --help Print this message\n" |
| " -V --version Print version of the program\n" |
| " -d --daemon Detach and run in the background\n" |
| " -D --debug Enable debug output\n" |
| " -c --children-max=INT Set maximum number of workers\n" |
| " -e --exec-delay=SECONDS Seconds to wait before executing RUN=\n" |
| " -t --event-timeout=SECONDS Seconds to wait before terminating an event\n" |
| " -N --resolve-names=early|late|never\n" |
| " When to resolve users and groups\n" |
| "\nSee the %s for details.\n" |
| , program_invocation_short_name |
| , link |
| ); |
| |
| return 0; |
| } |
| |
| static int parse_argv(int argc, char *argv[]) { |
| static const struct option options[] = { |
| { "daemon", no_argument, NULL, 'd' }, |
| { "debug", no_argument, NULL, 'D' }, |
| { "children-max", required_argument, NULL, 'c' }, |
| { "exec-delay", required_argument, NULL, 'e' }, |
| { "event-timeout", required_argument, NULL, 't' }, |
| { "resolve-names", required_argument, NULL, 'N' }, |
| { "help", no_argument, NULL, 'h' }, |
| { "version", no_argument, NULL, 'V' }, |
| {} |
| }; |
| |
| int c, r; |
| |
| assert(argc >= 0); |
| assert(argv); |
| |
| while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) { |
| switch (c) { |
| |
| case 'd': |
| arg_daemonize = true; |
| break; |
| case 'c': |
| r = safe_atou(optarg, &arg_children_max); |
| if (r < 0) |
| log_warning_errno(r, "Failed to parse --children-max= value '%s', ignoring: %m", optarg); |
| break; |
| case 'e': |
| r = parse_sec(optarg, &arg_exec_delay_usec); |
| if (r < 0) |
| log_warning_errno(r, "Failed to parse --exec-delay= value '%s', ignoring: %m", optarg); |
| break; |
| case 't': |
| r = parse_sec(optarg, &arg_event_timeout_usec); |
| if (r < 0) |
| log_warning_errno(r, "Failed to parse --event-timeout= value '%s', ignoring: %m", optarg); |
| break; |
| case 'D': |
| arg_debug = true; |
| break; |
| case 'N': { |
| ResolveNameTiming t; |
| |
| t = resolve_name_timing_from_string(optarg); |
| if (t < 0) |
| log_warning("Invalid --resolve-names= value '%s', ignoring.", optarg); |
| else |
| arg_resolve_name_timing = t; |
| break; |
| } |
| case 'h': |
| return help(); |
| case 'V': |
| printf("%s\n", GIT_VERSION); |
| return 0; |
| case '?': |
| return -EINVAL; |
| default: |
| assert_not_reached("Unhandled option"); |
| |
| } |
| } |
| |
| return 1; |
| } |
| |
| static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent, const char *cgroup) { |
| _cleanup_(manager_freep) Manager *manager = NULL; |
| int r; |
| |
| assert(ret); |
| |
| manager = new(Manager, 1); |
| if (!manager) |
| return log_oom(); |
| |
| *manager = (Manager) { |
| .fd_inotify = -1, |
| .worker_watch = { -1, -1 }, |
| .cgroup = cgroup, |
| }; |
| |
| r = udev_ctrl_new_from_fd(&manager->ctrl, fd_ctrl); |
| if (r < 0) |
| return log_error_errno(r, "Failed to initialize udev control socket: %m"); |
| |
| r = udev_ctrl_enable_receiving(manager->ctrl); |
| if (r < 0) |
| return log_error_errno(r, "Failed to bind udev control socket: %m"); |
| |
| r = device_monitor_new_full(&manager->monitor, MONITOR_GROUP_KERNEL, fd_uevent); |
| if (r < 0) |
| return log_error_errno(r, "Failed to initialize device monitor: %m"); |
| |
| (void) sd_device_monitor_set_receive_buffer_size(manager->monitor, 128 * 1024 * 1024); |
| |
| r = device_monitor_enable_receiving(manager->monitor); |
| if (r < 0) |
| return log_error_errno(r, "Failed to bind netlink socket: %m"); |
| |
| *ret = TAKE_PTR(manager); |
| |
| return 0; |
| } |
| |
| static int main_loop(Manager *manager) { |
| int fd_worker, r; |
| |
| manager->pid = getpid_cached(); |
| |
| /* unnamed socket from workers to the main daemon */ |
| r = socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); |
| if (r < 0) |
| return log_error_errno(errno, "Failed to create socketpair for communicating with workers: %m"); |
| |
| fd_worker = manager->worker_watch[READ_END]; |
| |
| r = setsockopt_int(fd_worker, SOL_SOCKET, SO_PASSCRED, true); |
| if (r < 0) |
| return log_error_errno(r, "Failed to enable SO_PASSCRED: %m"); |
| |
| r = udev_watch_init(); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create inotify descriptor: %m"); |
| manager->fd_inotify = r; |
| |
| udev_watch_restore(); |
| |
| /* block and listen to all signals on signalfd */ |
| assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0); |
| |
| r = sd_event_default(&manager->event); |
| if (r < 0) |
| return log_error_errno(r, "Failed to allocate event loop: %m"); |
| |
| r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create SIGINT event source: %m"); |
| |
| r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create SIGTERM event source: %m"); |
| |
| r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create SIGHUP event source: %m"); |
| |
| r = sd_event_add_signal(manager->event, NULL, SIGCHLD, on_sigchld, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create SIGCHLD event source: %m"); |
| |
| r = sd_event_set_watchdog(manager->event, true); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create watchdog event source: %m"); |
| |
| r = udev_ctrl_attach_event(manager->ctrl, manager->event); |
| if (r < 0) |
| return log_error_errno(r, "Failed to attach event to udev control: %m"); |
| |
| r = udev_ctrl_start(manager->ctrl, on_ctrl_msg, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to start device monitor: %m"); |
| |
| /* This needs to be after the inotify and uevent handling, to make sure |
| * that the ping is send back after fully processing the pending uevents |
| * (including the synthetic ones we may create due to inotify events). |
| */ |
| r = sd_event_source_set_priority(udev_ctrl_get_event_source(manager->ctrl), SD_EVENT_PRIORITY_IDLE); |
| if (r < 0) |
| return log_error_errno(r, "Failed to set IDLE event priority for udev control event source: %m"); |
| |
| r = sd_event_add_io(manager->event, &manager->inotify_event, manager->fd_inotify, EPOLLIN, on_inotify, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create inotify event source: %m"); |
| |
| r = sd_device_monitor_attach_event(manager->monitor, manager->event); |
| if (r < 0) |
| return log_error_errno(r, "Failed to attach event to device monitor: %m"); |
| |
| r = sd_device_monitor_start(manager->monitor, on_uevent, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to start device monitor: %m"); |
| |
| (void) sd_event_source_set_description(sd_device_monitor_get_event_source(manager->monitor), "device-monitor"); |
| |
| r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create worker event source: %m"); |
| |
| r = sd_event_add_post(manager->event, NULL, on_post, manager); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create post event source: %m"); |
| |
| udev_builtin_init(); |
| |
| r = udev_rules_new(&manager->rules, arg_resolve_name_timing); |
| if (!manager->rules) |
| return log_error_errno(r, "Failed to read udev rules: %m"); |
| |
| r = udev_rules_apply_static_dev_perms(manager->rules); |
| if (r < 0) |
| log_error_errno(r, "Failed to apply permissions on static device nodes: %m"); |
| |
| (void) sd_notifyf(false, |
| "READY=1\n" |
| "STATUS=Processing with %u children at max", arg_children_max); |
| |
| r = sd_event_loop(manager->event); |
| if (r < 0) |
| log_error_errno(r, "Event loop failed: %m"); |
| |
| sd_notify(false, |
| "STOPPING=1\n" |
| "STATUS=Shutting down..."); |
| return r; |
| } |
| |
| static int run(int argc, char *argv[]) { |
| _cleanup_free_ char *cgroup = NULL; |
| _cleanup_(manager_freep) Manager *manager = NULL; |
| int fd_ctrl = -1, fd_uevent = -1; |
| int r; |
| |
| log_set_target(LOG_TARGET_AUTO); |
| log_open(); |
| udev_parse_config_full(&arg_children_max, &arg_exec_delay_usec, &arg_event_timeout_usec, &arg_resolve_name_timing); |
| log_parse_environment(); |
| log_open(); /* Done again to update after reading configuration. */ |
| |
| r = parse_argv(argc, argv); |
| if (r <= 0) |
| return r; |
| |
| r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX); |
| if (r < 0) |
| log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); |
| |
| if (arg_debug) { |
| log_set_target(LOG_TARGET_CONSOLE); |
| log_set_max_level(LOG_DEBUG); |
| } |
| |
| log_set_max_level_realm(LOG_REALM_SYSTEMD, log_get_max_level()); |
| |
| r = must_be_root(); |
| if (r < 0) |
| return r; |
| |
| if (arg_children_max == 0) { |
| unsigned long cpu_limit, mem_limit; |
| unsigned long cpu_count = 1; |
| cpu_set_t cpu_set; |
| |
| if (sched_getaffinity(0, sizeof(cpu_set), &cpu_set) == 0) |
| cpu_count = CPU_COUNT(&cpu_set); |
| |
| cpu_limit = cpu_count * 2 + 16; |
| mem_limit = MAX(physical_memory() / (128UL*1024*1024), 10U); |
| |
| arg_children_max = MIN(cpu_limit, mem_limit); |
| arg_children_max = MIN(WORKER_NUM_MAX, arg_children_max); |
| |
| log_debug("Set children_max to %u", arg_children_max); |
| } |
| |
| /* set umask before creating any file/directory */ |
| r = chdir("/"); |
| if (r < 0) |
| return log_error_errno(errno, "Failed to change dir to '/': %m"); |
| |
| umask(022); |
| |
| r = mac_selinux_init(); |
| if (r < 0) |
| return log_error_errno(r, "Could not initialize labelling: %m"); |
| |
| r = mkdir_errno_wrapper("/run/udev", 0755); |
| if (r < 0 && r != -EEXIST) |
| return log_error_errno(r, "Failed to create /run/udev: %m"); |
| |
| dev_setup(NULL, UID_INVALID, GID_INVALID); |
| |
| if (getppid() == 1 && sd_booted() > 0) { |
| /* Get our own cgroup, we regularly kill everything udev has left behind. |
| * We only do this on systemd systems, and only if we are directly spawned |
| * by PID1. Otherwise we are not guaranteed to have a dedicated cgroup. */ |
| r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); |
| if (r < 0) { |
| if (IN_SET(r, -ENOENT, -ENOMEDIUM)) |
| log_debug_errno(r, "Dedicated cgroup not found: %m"); |
| else |
| log_warning_errno(r, "Failed to get cgroup: %m"); |
| } |
| } |
| |
| r = listen_fds(&fd_ctrl, &fd_uevent); |
| if (r < 0) |
| return log_error_errno(r, "Failed to listen on fds: %m"); |
| |
| r = manager_new(&manager, fd_ctrl, fd_uevent, cgroup); |
| if (r < 0) |
| return log_error_errno(r, "Failed to create manager: %m"); |
| |
| if (arg_daemonize) { |
| pid_t pid; |
| |
| log_info("Starting version " GIT_VERSION); |
| |
| /* connect /dev/null to stdin, stdout, stderr */ |
| if (log_get_max_level() < LOG_DEBUG) { |
| r = make_null_stdio(); |
| if (r < 0) |
| log_warning_errno(r, "Failed to redirect standard streams to /dev/null: %m"); |
| } |
| |
| pid = fork(); |
| if (pid < 0) |
| return log_error_errno(errno, "Failed to fork daemon: %m"); |
| if (pid > 0) |
| /* parent */ |
| return 0; |
| |
| /* child */ |
| (void) setsid(); |
| |
| r = set_oom_score_adjust(-1000); |
| if (r < 0) |
| log_debug_errno(r, "Failed to adjust OOM score, ignoring: %m"); |
| } |
| |
| return main_loop(manager); |
| } |
| |
| DEFINE_MAIN_FUNCTION(run); |