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Diffstat (limited to '')
| -rw-r--r-- | src/udev/udevd.c | 1855 |
1 files changed, 1855 insertions, 0 deletions
diff --git a/src/udev/udevd.c b/src/udev/udevd.c new file mode 100644 index 0000000..0303f36 --- /dev/null +++ b/src/udev/udevd.c @@ -0,0 +1,1855 @@ +/* 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 "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-util.h" +#include "udev-watch.h" +#include "udev.h" +#include "user-util.h" + +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; + struct udev_ctrl_connection *ctrl_conn_blocking; + int fd_inotify; + int worker_watch[2]; + + sd_event_source *ctrl_event; + sd_event_source *uevent_event; + 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->ctrl_event = sd_event_source_unref(manager->ctrl_event); + manager->uevent_event = sd_event_source_unref(manager->uevent_event); + 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_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking); + 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(); + + 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. + */ + + r = sd_device_get_property_value(dev, "ACTION", &val); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get the value of property 'ACTION': %m"); + + if (streq(val, "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; + const char *seqnum, *action; + int r; + + assert(manager); + assert(dev); + + r = sd_device_get_property_value(dev, "SEQNUM", &seqnum); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get SEQNUM: %m"); + + r = sd_device_get_property_value(dev, "ACTION", &action); + if (r < 0) + return log_device_debug_errno(dev, r, "Failed to get ACTION: %m"); + + log_device_debug(dev, "Processing device (SEQNUM=%s, ACTION=%s)", seqnum, 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 */ + udev_event_execute_rules(udev_event, arg_event_timeout_usec, manager->properties, manager->rules); + 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=%s, ACTION=%s) processed", seqnum, 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) { + 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) { + if (arg_children_max > 1) + log_debug("Maximum number (%u) of children reached.", hashmap_size(manager->workers)); + return; + } + + /* 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; + const char *val, *action; + struct event *event; + uint64_t seqnum; + int r; + + assert(manager); + assert(dev); + + /* only one process can add events to the queue */ + if (manager->pid == 0) + manager->pid = getpid_cached(); + + assert(manager->pid == getpid_cached()); + + /* We only accepts devices received by device monitor. */ + r = sd_device_get_property_value(dev, "SEQNUM", &val); + if (r < 0) + return r; + + r = safe_atou64(val, &seqnum); + if (r < 0) + return r; + + if (seqnum == 0) + return -EINVAL; + + /* Refuse devices do not have ACTION property. */ + r = sd_device_get_property_value(dev, "ACTION", &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, 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")) + return true; + } + + /* check network device ifindex */ + if (ifindex > 0) { + int i; + + if (sd_device_get_ifindex(loop_event->dev, &i) >= 0 && + ifindex == i) + return true; + } + + if (sd_device_get_devpath(loop_event->dev, &loop_devpath) < 0) + continue; + + /* check our old name */ + if (devpath_old && streq(devpath_old, loop_devpath)) { + event->delaying_seqnum = loop_event->seqnum; + return true; + } + + 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) { + /* devices names might have changed/swapped in the meantime */ + if (major(devnum) != 0 || ifindex > 0) + continue; + event->delaying_seqnum = loop_event->seqnum; + return true; + } + + /* parent device event found */ + if (devpath[common] == '/') { + event->delaying_seqnum = loop_event->seqnum; + return true; + } + + /* child device event found */ + if (loop_devpath[common] == '/') { + event->delaying_seqnum = loop_event->seqnum; + return true; + } + } + + return false; +} + +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_event = sd_event_source_unref(manager->ctrl_event); + 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->uevent_event = sd_event_source_unref(manager->uevent_event); + 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(sd_event_source *s, int fd, uint32_t revents, void *userdata) { + Manager *manager = userdata; + _cleanup_(udev_ctrl_connection_unrefp) struct udev_ctrl_connection *ctrl_conn = NULL; + _cleanup_(udev_ctrl_msg_unrefp) struct udev_ctrl_msg *ctrl_msg = NULL; + const char *str; + int i, r; + + assert(manager); + + ctrl_conn = udev_ctrl_get_connection(manager->ctrl); + if (!ctrl_conn) + return 1; + + ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); + if (!ctrl_msg) + return 1; + + i = udev_ctrl_get_set_log_level(ctrl_msg); + if (i >= 0) { + log_debug("Received udev control message (SET_LOG_LEVEL), setting log_priority=%i", i); + log_set_max_level_realm(LOG_REALM_UDEV, i); + log_set_max_level_realm(LOG_REALM_SYSTEMD, i); + manager_kill_workers(manager); + } + + if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { + log_debug("Received udev control message (STOP_EXEC_QUEUE)"); + manager->stop_exec_queue = true; + } + + if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { + log_debug("Received udev control message (START_EXEC_QUEUE)"); + manager->stop_exec_queue = false; + event_queue_start(manager); + } + + if (udev_ctrl_get_reload(ctrl_msg) > 0) { + log_debug("Received udev control message (RELOAD)"); + manager_reload(manager); + } + + str = udev_ctrl_get_set_env(ctrl_msg); + if (str) { + _cleanup_free_ char *key = NULL, *val = NULL, *old_key = NULL, *old_val = NULL; + char *eq; + + eq = strchr(str, '='); + if (!eq) { + log_error("Invalid key format '%s'", str); + return 1; + } + + key = strndup(str, eq - str); + 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); + } + + i = udev_ctrl_get_set_children_max(ctrl_msg); + if (i >= 0) { + log_debug("Receivd udev control message (SET_MAX_CHILDREN), setting children_max=%i", i); + arg_children_max = i; + + (void) sd_notifyf(false, + "READY=1\n" + "STATUS=Processing with %u children at max", arg_children_max); + } + + if (udev_ctrl_get_ping(ctrl_msg) > 0) + log_debug("Received udev control message (PING)"); + + if (udev_ctrl_get_exit(ctrl_msg) > 0) { + log_debug("Received udev control message (EXIT)"); + manager_exit(manager); + /* keep reference to block the client until we exit + TODO: deal with several blocking exit requests */ + manager->ctrl_conn_blocking = udev_ctrl_connection_ref(ctrl_conn); + } + + return 1; +} + +static int synthesize_change(sd_device *dev) { + const char *subsystem, *sysname, *devname, *syspath, *devtype; + char filename[PATH_MAX]; + 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. + */ + log_debug("Device '%s' is closed, synthesising 'change'", devname); + strscpyl(filename, sizeof(filename), syspath, "/uevent", NULL); + write_string_file(filename, "change", WRITE_STRING_FILE_DISABLE_BUFFER); + + 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; + + log_debug("Device '%s' is closed, synthesising partition '%s' 'change'", devname, n); + strscpyl(filename, sizeof(filename), s, "/uevent", NULL); + write_string_file(filename, "change", WRITE_STRING_FILE_DISABLE_BUFFER); + } + + return 0; + } + + log_debug("Device %s is closed, synthesising 'change'", devname); + strscpyl(filename, sizeof(filename), syspath, "/uevent", NULL); + write_string_file(filename, "change", WRITE_STRING_FILE_DISABLE_BUFFER); + + 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); + + /* 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, + }; + + manager->ctrl = udev_ctrl_new_from_fd(fd_ctrl); + if (!manager->ctrl) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to initialize udev control socket"); + + 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, fd_ctrl, r; + + /* 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"); + + fd_ctrl = udev_ctrl_get_fd(manager->ctrl); + if (fd_ctrl < 0) + return log_error_errno(fd_ctrl, "Failed to get udev control socket fd: %m"); + + r = sd_event_add_io(manager->event, &manager->ctrl_event, fd_ctrl, EPOLLIN, on_ctrl_msg, manager); + if (r < 0) + return log_error_errno(r, "Failed to create udev control event source: %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(manager->ctrl_event, 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); + udev_parse_config_full(&arg_children_max, &arg_exec_delay_usec, &arg_event_timeout_usec, &arg_resolve_name_timing); + log_parse_environment(); + log_open(); + + 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) { + cpu_set_t cpu_set; + unsigned long mem_limit; + + arg_children_max = 8; + + if (sched_getaffinity(0, sizeof(cpu_set), &cpu_set) == 0) + arg_children_max += CPU_COUNT(&cpu_set) * 8; + + mem_limit = physical_memory() / (128LU*1024*1024); + arg_children_max = MAX(10U, MIN(arg_children_max, mem_limit)); + + 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"); + } + + r = main_loop(manager); + /* FIXME: move this into manager_free() */ + udev_ctrl_cleanup(manager->ctrl); + return r; +} + +DEFINE_MAIN_FUNCTION(run); |