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Diffstat (limited to 'src/grp-udev/systemd-udevd/udevd.c')
-rw-r--r--src/grp-udev/systemd-udevd/udevd.c1764
1 files changed, 1764 insertions, 0 deletions
diff --git a/src/grp-udev/systemd-udevd/udevd.c b/src/grp-udev/systemd-udevd/udevd.c
new file mode 100644
index 0000000000..ffe1ddbe2b
--- /dev/null
+++ b/src/grp-udev/systemd-udevd/udevd.c
@@ -0,0 +1,1764 @@
+/*
+ * Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org>
+ * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
+ * Copyright (C) 2009 Canonical Ltd.
+ * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#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 <systemd/sd-daemon.h>
+#include <systemd/sd-event.h>
+
+#include "sd-netlink/netlink-util.h"
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/cgroup-util.h"
+#include "systemd-basic/cpu-set-util.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/formats-util.h"
+#include "systemd-basic/fs-util.h"
+#include "systemd-basic/hashmap.h"
+#include "systemd-basic/io-util.h"
+#include "systemd-basic/parse-util.h"
+#include "systemd-basic/proc-cmdline.h"
+#include "systemd-basic/process-util.h"
+#include "systemd-basic/selinux-util.h"
+#include "systemd-basic/signal-util.h"
+#include "systemd-basic/socket-util.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/terminal-util.h"
+#include "systemd-basic/user-util.h"
+#include "systemd-shared/dev-setup.h"
+#include "systemd-shared/udev-util.h"
+#include "udev.h"
+
+static bool arg_debug = false;
+static int arg_daemonize = false;
+static int arg_resolve_names = 1;
+static unsigned arg_children_max;
+static int arg_exec_delay;
+static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC;
+static usec_t arg_event_timeout_warn_usec = 180 * USEC_PER_SEC / 3;
+
+typedef struct Manager {
+ struct udev *udev;
+ sd_event *event;
+ Hashmap *workers;
+ struct udev_list_node events;
+ const char *cgroup;
+ pid_t pid; /* the process that originally allocated the manager object */
+
+ struct udev_rules *rules;
+ struct udev_list properties;
+
+ struct udev_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;
+
+ usec_t last_usec;
+
+ bool stop_exec_queue:1;
+ bool exit:1;
+} Manager;
+
+enum event_state {
+ EVENT_UNDEF,
+ EVENT_QUEUED,
+ EVENT_RUNNING,
+};
+
+struct event {
+ struct udev_list_node node;
+ Manager *manager;
+ struct udev *udev;
+ struct udev_device *dev;
+ struct udev_device *dev_kernel;
+ struct worker *worker;
+ enum event_state state;
+ unsigned long long int delaying_seqnum;
+ unsigned long long int seqnum;
+ const char *devpath;
+ size_t devpath_len;
+ const char *devpath_old;
+ dev_t devnum;
+ int ifindex;
+ bool is_block;
+ sd_event_source *timeout_warning;
+ sd_event_source *timeout;
+};
+
+static inline struct event *node_to_event(struct udev_list_node *node) {
+ return container_of(node, struct event, node);
+}
+
+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;
+ struct udev_list_node node;
+ int refcount;
+ pid_t pid;
+ struct udev_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) {
+ int r;
+
+ if (!event)
+ return;
+
+ udev_list_node_remove(&event->node);
+ udev_device_unref(event->dev);
+ udev_device_unref(event->dev_kernel);
+
+ sd_event_source_unref(event->timeout_warning);
+ sd_event_source_unref(event->timeout);
+
+ if (event->worker)
+ event->worker->event = NULL;
+
+ assert(event->manager);
+
+ if (udev_list_node_is_empty(&event->manager->events)) {
+ /* only clean up the queue from the process that created it */
+ if (event->manager->pid == getpid()) {
+ r = unlink("/run/udev/queue");
+ if (r < 0)
+ log_warning_errno(errno, "could not 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));
+ udev_monitor_unref(worker->monitor);
+ event_free(worker->event);
+
+ free(worker);
+}
+
+static void manager_workers_free(Manager *manager) {
+ struct worker *worker;
+ Iterator i;
+
+ assert(manager);
+
+ HASHMAP_FOREACH(worker, manager->workers, i)
+ worker_free(worker);
+
+ manager->workers = hashmap_free(manager->workers);
+}
+
+static int worker_new(struct worker **ret, Manager *manager, struct udev_monitor *worker_monitor, pid_t pid) {
+ _cleanup_free_ struct worker *worker = NULL;
+ int r;
+
+ assert(ret);
+ assert(manager);
+ assert(worker_monitor);
+ assert(pid > 1);
+
+ worker = new0(struct worker, 1);
+ if (!worker)
+ return -ENOMEM;
+
+ worker->refcount = 1;
+ worker->manager = manager;
+ /* close monitor, but keep address around */
+ udev_monitor_disconnect(worker_monitor);
+ worker->monitor = udev_monitor_ref(worker_monitor);
+ worker->pid = pid;
+
+ r = hashmap_ensure_allocated(&manager->workers, NULL);
+ if (r < 0)
+ return r;
+
+ r = hashmap_put(manager->workers, PID_TO_PTR(pid), worker);
+ if (r < 0)
+ return r;
+
+ *ret = worker;
+ worker = NULL;
+
+ 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_error("seq %llu '%s' killed", udev_device_get_seqnum(event->dev), event->devpath);
+
+ return 1;
+}
+
+static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) {
+ struct event *event = userdata;
+
+ assert(event);
+
+ log_warning("seq %llu '%s' is taking a long time", udev_device_get_seqnum(event->dev), event->devpath);
+
+ 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_boottime_or_monotonic(), &usec) >= 0);
+
+ (void) sd_event_add_time(e, &event->timeout_warning, clock_boottime_or_monotonic(),
+ usec + arg_event_timeout_warn_usec, USEC_PER_SEC, on_event_timeout_warning, event);
+
+ (void) sd_event_add_time(e, &event->timeout, clock_boottime_or_monotonic(),
+ usec + arg_event_timeout_usec, USEC_PER_SEC, on_event_timeout, event);
+}
+
+static void manager_free(Manager *manager) {
+ if (!manager)
+ return;
+
+ udev_builtin_exit(manager->udev);
+
+ sd_event_source_unref(manager->ctrl_event);
+ sd_event_source_unref(manager->uevent_event);
+ sd_event_source_unref(manager->inotify_event);
+
+ udev_unref(manager->udev);
+ sd_event_unref(manager->event);
+ manager_workers_free(manager);
+ event_queue_cleanup(manager, EVENT_UNDEF);
+
+ udev_monitor_unref(manager->monitor);
+ udev_ctrl_unref(manager->ctrl);
+ udev_ctrl_connection_unref(manager->ctrl_conn_blocking);
+
+ udev_list_cleanup(&manager->properties);
+ udev_rules_unref(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 void worker_spawn(Manager *manager, struct event *event) {
+ struct udev *udev = event->udev;
+ _cleanup_udev_monitor_unref_ struct udev_monitor *worker_monitor = NULL;
+ pid_t pid;
+ int r = 0;
+
+ /* listen for new events */
+ worker_monitor = udev_monitor_new_from_netlink(udev, NULL);
+ if (worker_monitor == NULL)
+ return;
+ /* allow the main daemon netlink address to send devices to the worker */
+ udev_monitor_allow_unicast_sender(worker_monitor, manager->monitor);
+ r = udev_monitor_enable_receiving(worker_monitor);
+ if (r < 0)
+ log_error_errno(r, "worker: could not enable receiving of device: %m");
+
+ pid = fork();
+ switch (pid) {
+ case 0: {
+ struct udev_device *dev = NULL;
+ _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
+ int fd_monitor;
+ _cleanup_close_ int fd_signal = -1, fd_ep = -1;
+ struct epoll_event ep_signal = { .events = EPOLLIN };
+ struct epoll_event ep_monitor = { .events = EPOLLIN };
+ sigset_t mask;
+
+ /* take initial device from queue */
+ dev = event->dev;
+ event->dev = NULL;
+
+ unsetenv("NOTIFY_SOCKET");
+
+ manager_workers_free(manager);
+ event_queue_cleanup(manager, EVENT_UNDEF);
+
+ manager->monitor = udev_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]);
+
+ 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->event = sd_event_unref(manager->event);
+
+ sigfillset(&mask);
+ fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
+ if (fd_signal < 0) {
+ r = log_error_errno(errno, "error creating signalfd %m");
+ goto out;
+ }
+ ep_signal.data.fd = fd_signal;
+
+ fd_monitor = udev_monitor_get_fd(worker_monitor);
+ ep_monitor.data.fd = fd_monitor;
+
+ fd_ep = epoll_create1(EPOLL_CLOEXEC);
+ if (fd_ep < 0) {
+ r = log_error_errno(errno, "error creating epoll fd: %m");
+ goto out;
+ }
+
+ if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 ||
+ epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) {
+ r = log_error_errno(errno, "fail to add fds to epoll: %m");
+ goto out;
+ }
+
+ /* Request TERM signal if parent exits.
+ Ignore error, not much we can do in that case. */
+ (void) prctl(PR_SET_PDEATHSIG, SIGTERM);
+
+ /* Reset OOM score, we only protect the main daemon. */
+ write_string_file("/proc/self/oom_score_adj", "0", 0);
+
+ for (;;) {
+ struct udev_event *udev_event;
+ int fd_lock = -1;
+
+ assert(dev);
+
+ log_debug("seq %llu running", udev_device_get_seqnum(dev));
+ udev_event = udev_event_new(dev);
+ if (udev_event == NULL) {
+ r = -ENOMEM;
+ goto out;
+ }
+
+ if (arg_exec_delay > 0)
+ udev_event->exec_delay = arg_exec_delay;
+
+ /*
+ * 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 (!streq_ptr(udev_device_get_action(dev), "remove") &&
+ streq_ptr("block", udev_device_get_subsystem(dev)) &&
+ !startswith(udev_device_get_sysname(dev), "dm-") &&
+ !startswith(udev_device_get_sysname(dev), "md")) {
+ struct udev_device *d = dev;
+
+ if (streq_ptr("partition", udev_device_get_devtype(d)))
+ d = udev_device_get_parent(d);
+
+ if (d) {
+ fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK);
+ if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) {
+ log_debug_errno(errno, "Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d));
+ fd_lock = safe_close(fd_lock);
+ goto skip;
+ }
+ }
+ }
+
+ /* needed for renaming netifs */
+ udev_event->rtnl = rtnl;
+
+ /* apply rules, create node, symlinks */
+ udev_event_execute_rules(udev_event,
+ arg_event_timeout_usec, arg_event_timeout_warn_usec,
+ &manager->properties,
+ manager->rules);
+
+ udev_event_execute_run(udev_event,
+ arg_event_timeout_usec, arg_event_timeout_warn_usec);
+
+ if (udev_event->rtnl)
+ /* in case rtnl was initialized */
+ rtnl = sd_netlink_ref(udev_event->rtnl);
+
+ /* apply/restore inotify watch */
+ if (udev_event->inotify_watch) {
+ udev_watch_begin(udev, dev);
+ udev_device_update_db(dev);
+ }
+
+ safe_close(fd_lock);
+
+ /* send processed event back to libudev listeners */
+ udev_monitor_send_device(worker_monitor, NULL, dev);
+
+skip:
+ log_debug("seq %llu processed", udev_device_get_seqnum(dev));
+
+ /* send udevd the result of the event execution */
+ r = worker_send_message(manager->worker_watch[WRITE_END]);
+ if (r < 0)
+ log_error_errno(r, "failed to send result of seq %llu to main daemon: %m",
+ udev_device_get_seqnum(dev));
+
+ udev_device_unref(dev);
+ dev = NULL;
+
+ udev_event_unref(udev_event);
+
+ /* wait for more device messages from main udevd, or term signal */
+ while (dev == NULL) {
+ struct epoll_event ev[4];
+ int fdcount;
+ int i;
+
+ fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1);
+ if (fdcount < 0) {
+ if (errno == EINTR)
+ continue;
+ r = log_error_errno(errno, "failed to poll: %m");
+ goto out;
+ }
+
+ for (i = 0; i < fdcount; i++) {
+ if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) {
+ dev = udev_monitor_receive_device(worker_monitor);
+ break;
+ } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) {
+ struct signalfd_siginfo fdsi;
+ ssize_t size;
+
+ size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
+ if (size != sizeof(struct signalfd_siginfo))
+ continue;
+ switch (fdsi.ssi_signo) {
+ case SIGTERM:
+ goto out;
+ }
+ }
+ }
+ }
+ }
+out:
+ udev_device_unref(dev);
+ manager_free(manager);
+ log_close();
+ _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
+ }
+ case -1:
+ event->state = EVENT_QUEUED;
+ log_error_errno(errno, "fork of child failed: %m");
+ break;
+ default:
+ {
+ struct worker *worker;
+
+ r = worker_new(&worker, manager, worker_monitor, pid);
+ if (r < 0)
+ return;
+
+ worker_attach_event(worker, event);
+
+ log_debug("seq %llu forked new worker ["PID_FMT"]", udev_device_get_seqnum(event->dev), pid);
+ break;
+ }
+ }
+}
+
+static void event_run(Manager *manager, struct event *event) {
+ struct worker *worker;
+ Iterator i;
+
+ assert(manager);
+ assert(event);
+
+ HASHMAP_FOREACH(worker, manager->workers, i) {
+ ssize_t count;
+
+ if (worker->state != WORKER_IDLE)
+ continue;
+
+ count = udev_monitor_send_device(manager->monitor, worker->monitor, event->dev);
+ if (count < 0) {
+ log_error_errno(errno, "worker ["PID_FMT"] did not accept message %zi (%m), kill it",
+ worker->pid, count);
+ 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 (%i) 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, struct udev_device *dev) {
+ struct event *event;
+ int r;
+
+ assert(manager);
+ assert(dev);
+
+ /* only one process can add events to the queue */
+ if (manager->pid == 0)
+ manager->pid = getpid();
+
+ assert(manager->pid == getpid());
+
+ event = new0(struct event, 1);
+ if (!event)
+ return -ENOMEM;
+
+ event->udev = udev_device_get_udev(dev);
+ event->manager = manager;
+ event->dev = dev;
+ event->dev_kernel = udev_device_shallow_clone(dev);
+ udev_device_copy_properties(event->dev_kernel, dev);
+ event->seqnum = udev_device_get_seqnum(dev);
+ event->devpath = udev_device_get_devpath(dev);
+ event->devpath_len = strlen(event->devpath);
+ event->devpath_old = udev_device_get_devpath_old(dev);
+ event->devnum = udev_device_get_devnum(dev);
+ event->is_block = streq("block", udev_device_get_subsystem(dev));
+ event->ifindex = udev_device_get_ifindex(dev);
+
+ log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev),
+ udev_device_get_action(dev), udev_device_get_subsystem(dev));
+
+ event->state = EVENT_QUEUED;
+
+ if (udev_list_node_is_empty(&manager->events)) {
+ r = touch("/run/udev/queue");
+ if (r < 0)
+ log_warning_errno(r, "could not touch /run/udev/queue: %m");
+ }
+
+ udev_list_node_append(&event->node, &manager->events);
+
+ 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;
+ kill(worker->pid, SIGTERM);
+ }
+}
+
+/* lookup event for identical, parent, child device */
+static bool is_devpath_busy(Manager *manager, struct event *event) {
+ struct udev_list_node *loop;
+ size_t common;
+
+ /* check if queue contains events we depend on */
+ udev_list_node_foreach(loop, &manager->events) {
+ struct event *loop_event = node_to_event(loop);
+
+ /* we already found a later event, earlier can not 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(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block)
+ return true;
+
+ /* check network device ifindex */
+ if (event->ifindex != 0 && event->ifindex == loop_event->ifindex)
+ return true;
+
+ /* check our old name */
+ if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) {
+ event->delaying_seqnum = loop_event->seqnum;
+ return true;
+ }
+
+ /* compare devpath */
+ common = MIN(loop_event->devpath_len, event->devpath_len);
+
+ /* one devpath is contained in the other? */
+ if (memcmp(loop_event->devpath, event->devpath, common) != 0)
+ continue;
+
+ /* identical device event found */
+ if (loop_event->devpath_len == event->devpath_len) {
+ /* devices names might have changed/swapped in the meantime */
+ if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block))
+ continue;
+ if (event->ifindex != 0 && event->ifindex != loop_event->ifindex)
+ continue;
+ event->delaying_seqnum = loop_event->seqnum;
+ return true;
+ }
+
+ /* parent device event found */
+ if (event->devpath[common] == '/') {
+ event->delaying_seqnum = loop_event->seqnum;
+ return true;
+ }
+
+ /* child device event found */
+ if (loop_event->devpath[common] == '/') {
+ event->delaying_seqnum = loop_event->seqnum;
+ return true;
+ }
+
+ /* no matching device */
+ continue;
+ }
+
+ return false;
+}
+
+static int on_exit_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
+ Manager *manager = userdata;
+
+ assert(manager);
+
+ log_error_errno(ETIMEDOUT, "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 = udev_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_boottime_or_monotonic(), &usec) >= 0);
+
+ r = sd_event_add_time(manager->event, NULL, clock_boottime_or_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_unref(manager->rules);
+ udev_builtin_exit(manager->udev);
+
+ sd_notify(false,
+ "READY=1\n"
+ "STATUS=Processing...");
+}
+
+static void event_queue_start(Manager *manager) {
+ struct udev_list_node *loop;
+ usec_t usec;
+
+ assert(manager);
+
+ if (udev_list_node_is_empty(&manager->events) ||
+ manager->exit || manager->stop_exec_queue)
+ return;
+
+ assert_se(sd_event_now(manager->event, clock_boottime_or_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->udev))
+ manager_reload(manager);
+
+ manager->last_usec = usec;
+ }
+
+ udev_builtin_init(manager->udev);
+
+ if (!manager->rules) {
+ manager->rules = udev_rules_new(manager->udev, arg_resolve_names);
+ if (!manager->rules)
+ return;
+ }
+
+ udev_list_node_foreach(loop, &manager->events) {
+ struct event *event = node_to_event(loop);
+
+ if (event->state != EVENT_QUEUED)
+ continue;
+
+ /* do not start event if parent or child event is still running */
+ if (is_devpath_busy(manager, event))
+ continue;
+
+ event_run(manager, event);
+ }
+}
+
+static void event_queue_cleanup(Manager *manager, enum event_state match_type) {
+ struct udev_list_node *loop, *tmp;
+
+ udev_list_node_foreach_safe(loop, tmp, &manager->events) {
+ struct event *event = node_to_event(loop);
+
+ 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_errno(EIO, "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_errno(EIO, "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_event_source *s, int fd, uint32_t revents, void *userdata) {
+ Manager *manager = userdata;
+ struct udev_device *dev;
+ int r;
+
+ assert(manager);
+
+ dev = udev_monitor_receive_device(manager->monitor);
+ if (dev) {
+ udev_device_ensure_usec_initialized(dev, NULL);
+ r = event_queue_insert(manager, dev);
+ if (r < 0)
+ udev_device_unref(dev);
+ else
+ /* 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_unref_ struct udev_ctrl_connection *ctrl_conn = NULL;
+ _cleanup_udev_ctrl_msg_unref_ struct udev_ctrl_msg *ctrl_msg = NULL;
+ const char *str;
+ int i;
+
+ 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("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i);
+ log_set_max_level(i);
+ manager_kill_workers(manager);
+ }
+
+ if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
+ log_debug("udevd message (STOP_EXEC_QUEUE) received");
+ manager->stop_exec_queue = true;
+ }
+
+ if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
+ log_debug("udevd message (START_EXEC_QUEUE) received");
+ manager->stop_exec_queue = false;
+ event_queue_start(manager);
+ }
+
+ if (udev_ctrl_get_reload(ctrl_msg) > 0) {
+ log_debug("udevd message (RELOAD) received");
+ manager_reload(manager);
+ }
+
+ str = udev_ctrl_get_set_env(ctrl_msg);
+ if (str != NULL) {
+ _cleanup_free_ char *key = NULL;
+
+ key = strdup(str);
+ if (key) {
+ char *val;
+
+ val = strchr(key, '=');
+ if (val != NULL) {
+ val[0] = '\0';
+ val = &val[1];
+ if (val[0] == '\0') {
+ log_debug("udevd message (ENV) received, unset '%s'", key);
+ udev_list_entry_add(&manager->properties, key, NULL);
+ } else {
+ log_debug("udevd message (ENV) received, set '%s=%s'", key, val);
+ udev_list_entry_add(&manager->properties, key, val);
+ }
+ } else
+ log_error("wrong key format '%s'", key);
+ }
+ manager_kill_workers(manager);
+ }
+
+ i = udev_ctrl_get_set_children_max(ctrl_msg);
+ if (i >= 0) {
+ log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i);
+ arg_children_max = i;
+ }
+
+ if (udev_ctrl_get_ping(ctrl_msg) > 0)
+ log_debug("udevd message (SYNC) received");
+
+ if (udev_ctrl_get_exit(ctrl_msg) > 0) {
+ log_debug("udevd message (EXIT) received");
+ 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(struct udev_device *dev) {
+ char filename[UTIL_PATH_SIZE];
+ int r;
+
+ if (streq_ptr("block", udev_device_get_subsystem(dev)) &&
+ streq_ptr("disk", udev_device_get_devtype(dev)) &&
+ !startswith(udev_device_get_sysname(dev), "dm-")) {
+ bool part_table_read = false;
+ bool has_partitions = false;
+ int fd;
+ struct udev *udev = udev_device_get_udev(dev);
+ _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
+ struct udev_list_entry *item;
+
+ /*
+ * 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(udev_device_get_devnode(dev), 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 */
+ e = udev_enumerate_new(udev);
+ if (!e)
+ return -ENOMEM;
+
+ r = udev_enumerate_add_match_parent(e, dev);
+ if (r < 0)
+ return r;
+
+ r = udev_enumerate_add_match_subsystem(e, "block");
+ if (r < 0)
+ return r;
+
+ r = udev_enumerate_scan_devices(e);
+ if (r < 0)
+ return r;
+
+ udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
+ _cleanup_udev_device_unref_ struct udev_device *d = NULL;
+
+ d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
+ if (!d)
+ continue;
+
+ if (!streq_ptr("partition", udev_device_get_devtype(d)))
+ 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 closed, synthesising 'change'", udev_device_get_devnode(dev));
+ strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
+ write_string_file(filename, "change", WRITE_STRING_FILE_CREATE);
+
+ udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) {
+ _cleanup_udev_device_unref_ struct udev_device *d = NULL;
+
+ d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
+ if (!d)
+ continue;
+
+ if (!streq_ptr("partition", udev_device_get_devtype(d)))
+ continue;
+
+ log_debug("device %s closed, synthesising partition '%s' 'change'",
+ udev_device_get_devnode(dev), udev_device_get_devnode(d));
+ strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL);
+ write_string_file(filename, "change", WRITE_STRING_FILE_CREATE);
+ }
+
+ return 0;
+ }
+
+ log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev));
+ strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL);
+ write_string_file(filename, "change", WRITE_STRING_FILE_CREATE);
+
+ 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;
+
+ assert(manager);
+
+ l = read(fd, &buffer, sizeof(buffer));
+ if (l < 0) {
+ if (errno == EAGAIN || errno == EINTR)
+ return 1;
+
+ return log_error_errno(errno, "Failed to read inotify fd: %m");
+ }
+
+ FOREACH_INOTIFY_EVENT(e, buffer, l) {
+ _cleanup_udev_device_unref_ struct udev_device *dev = NULL;
+
+ dev = udev_watch_lookup(manager->udev, e->wd);
+ if (!dev)
+ continue;
+
+ log_debug("inotify event: %x for %s", e->mask, udev_device_get_devnode(dev));
+ if (e->mask & IN_CLOSE_WRITE) {
+ synthesize_change(dev);
+
+ /* settle might be waiting on us to determine the queue
+ * state. If we just handled an inotify event, we might have
+ * generated a "change" event, but we won't have queued up
+ * the resultant uevent yet. Do that.
+ */
+ on_uevent(NULL, -1, 0, manager);
+ } else if (e->mask & IN_IGNORED)
+ udev_watch_end(manager->udev, 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;
+
+ 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), strsignal(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) {
+ if (worker->event) {
+ log_error("worker ["PID_FMT"] failed while handling '%s'", pid, worker->event->devpath);
+ /* delete state from disk */
+ udev_device_delete_db(worker->event->dev);
+ udev_device_tag_index(worker->event->dev, NULL, false);
+ /* forward kernel event without amending it */
+ udev_monitor_send_device(manager->monitor, NULL, worker->event->dev_kernel);
+ }
+ }
+
+ worker_free(worker);
+ }
+
+ /* we can start new workers, try to schedule events */
+ event_queue_start(manager);
+
+ return 1;
+}
+
+static int on_post(sd_event_source *s, void *userdata) {
+ Manager *manager = userdata;
+ int r;
+
+ assert(manager);
+
+ if (udev_list_node_is_empty(&manager->events)) {
+ /* no pending events */
+ if (!hashmap_isempty(manager->workers)) {
+ /* there are idle workers */
+ log_debug("cleanup idle workers");
+ manager_kill_workers(manager);
+ } else {
+ /* we are idle */
+ if (manager->exit) {
+ r = sd_event_exit(manager->event, 0);
+ if (r < 0)
+ return r;
+ } else if (manager->cgroup)
+ /* cleanup possible left-over processes in our cgroup */
+ cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, CGROUP_IGNORE_SELF, NULL, NULL, NULL);
+ }
+ }
+
+ return 1;
+}
+
+static int listen_fds(int *rctrl, int *rnetlink) {
+ _cleanup_udev_unref_ struct udev *udev = NULL;
+ int ctrl_fd = -1, netlink_fd = -1;
+ int fd, n, r;
+
+ assert(rctrl);
+ assert(rnetlink);
+
+ 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)) {
+ if (ctrl_fd >= 0)
+ return -EINVAL;
+ ctrl_fd = fd;
+ continue;
+ }
+
+ if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) {
+ if (netlink_fd >= 0)
+ return -EINVAL;
+ netlink_fd = fd;
+ continue;
+ }
+
+ return -EINVAL;
+ }
+
+ if (ctrl_fd < 0) {
+ _cleanup_udev_ctrl_unref_ struct udev_ctrl *ctrl = NULL;
+
+ udev = udev_new();
+ if (!udev)
+ return -ENOMEM;
+
+ ctrl = udev_ctrl_new(udev);
+ if (!ctrl)
+ return log_error_errno(EINVAL, "error initializing udev control socket");
+
+ r = udev_ctrl_enable_receiving(ctrl);
+ if (r < 0)
+ return log_error_errno(EINVAL, "error binding udev control socket");
+
+ fd = udev_ctrl_get_fd(ctrl);
+ if (fd < 0)
+ return log_error_errno(EIO, "could not get ctrl fd");
+
+ ctrl_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
+ if (ctrl_fd < 0)
+ return log_error_errno(errno, "could not dup ctrl fd: %m");
+ }
+
+ if (netlink_fd < 0) {
+ _cleanup_udev_monitor_unref_ struct udev_monitor *monitor = NULL;
+
+ if (!udev) {
+ udev = udev_new();
+ if (!udev)
+ return -ENOMEM;
+ }
+
+ monitor = udev_monitor_new_from_netlink(udev, "kernel");
+ if (!monitor)
+ return log_error_errno(EINVAL, "error initializing netlink socket");
+
+ (void) udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024);
+
+ r = udev_monitor_enable_receiving(monitor);
+ if (r < 0)
+ return log_error_errno(EINVAL, "error binding netlink socket");
+
+ fd = udev_monitor_get_fd(monitor);
+ if (fd < 0)
+ return log_error_errno(netlink_fd, "could not get uevent fd: %m");
+
+ netlink_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
+ if (ctrl_fd < 0)
+ return log_error_errno(errno, "could not dup netlink fd: %m");
+ }
+
+ *rctrl = ctrl_fd;
+ *rnetlink = 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) {
+ const char *full_key = key;
+ int r;
+
+ assert(key);
+
+ if (!value)
+ return 0;
+
+ if (startswith(key, "rd."))
+ key += strlen("rd.");
+
+ if (startswith(key, "udev."))
+ key += strlen("udev.");
+ else
+ return 0;
+
+ if (streq(key, "log-priority")) {
+ int prio;
+
+ prio = util_log_priority(value);
+ if (prio < 0)
+ goto invalid;
+ log_set_max_level(prio);
+ } else if (streq(key, "children-max")) {
+ r = safe_atou(value, &arg_children_max);
+ if (r < 0)
+ goto invalid;
+ } else if (streq(key, "exec-delay")) {
+ r = safe_atoi(value, &arg_exec_delay);
+ if (r < 0)
+ goto invalid;
+ } else if (streq(key, "event-timeout")) {
+ r = safe_atou64(value, &arg_event_timeout_usec);
+ if (r < 0)
+ goto invalid;
+ arg_event_timeout_usec *= USEC_PER_SEC;
+ arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
+ }
+
+ return 0;
+invalid:
+ log_warning("invalid %s ignored: %s", full_key, value);
+ return 0;
+}
+
+static void help(void) {
+ printf("%s [OPTIONS...]\n\n"
+ "Manages devices.\n\n"
+ " -h --help Print this message\n"
+ " --version Print version of the program\n"
+ " --daemon Detach and run in the background\n"
+ " --debug Enable debug output\n"
+ " --children-max=INT Set maximum number of workers\n"
+ " --exec-delay=SECONDS Seconds to wait before executing RUN=\n"
+ " --event-timeout=SECONDS Seconds to wait before terminating an event\n"
+ " --resolve-names=early|late|never\n"
+ " When to resolve users and groups\n"
+ , program_invocation_short_name);
+}
+
+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;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) {
+ int r;
+
+ switch (c) {
+
+ case 'd':
+ arg_daemonize = true;
+ break;
+ case 'c':
+ r = safe_atou(optarg, &arg_children_max);
+ if (r < 0)
+ log_warning("Invalid --children-max ignored: %s", optarg);
+ break;
+ case 'e':
+ r = safe_atoi(optarg, &arg_exec_delay);
+ if (r < 0)
+ log_warning("Invalid --exec-delay ignored: %s", optarg);
+ break;
+ case 't':
+ r = safe_atou64(optarg, &arg_event_timeout_usec);
+ if (r < 0)
+ log_warning("Invalid --event-timeout ignored: %s", optarg);
+ else {
+ arg_event_timeout_usec *= USEC_PER_SEC;
+ arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1;
+ }
+ break;
+ case 'D':
+ arg_debug = true;
+ break;
+ case 'N':
+ if (streq(optarg, "early")) {
+ arg_resolve_names = 1;
+ } else if (streq(optarg, "late")) {
+ arg_resolve_names = 0;
+ } else if (streq(optarg, "never")) {
+ arg_resolve_names = -1;
+ } else {
+ log_error("resolve-names must be early, late or never");
+ return 0;
+ }
+ break;
+ case 'h':
+ help();
+ return 0;
+ case 'V':
+ printf("%s\n", 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, fd_worker, one = 1;
+
+ assert(ret);
+ assert(fd_ctrl >= 0);
+ assert(fd_uevent >= 0);
+
+ manager = new0(Manager, 1);
+ if (!manager)
+ return log_oom();
+
+ manager->fd_inotify = -1;
+ manager->worker_watch[WRITE_END] = -1;
+ manager->worker_watch[READ_END] = -1;
+
+ manager->udev = udev_new();
+ if (!manager->udev)
+ return log_error_errno(errno, "could not allocate udev context: %m");
+
+ udev_builtin_init(manager->udev);
+
+ manager->rules = udev_rules_new(manager->udev, arg_resolve_names);
+ if (!manager->rules)
+ return log_error_errno(ENOMEM, "error reading rules");
+
+ udev_list_node_init(&manager->events);
+ udev_list_init(manager->udev, &manager->properties, true);
+
+ manager->cgroup = cgroup;
+
+ manager->ctrl = udev_ctrl_new_from_fd(manager->udev, fd_ctrl);
+ if (!manager->ctrl)
+ return log_error_errno(EINVAL, "error taking over udev control socket");
+
+ manager->monitor = udev_monitor_new_from_netlink_fd(manager->udev, "kernel", fd_uevent);
+ if (!manager->monitor)
+ return log_error_errno(EINVAL, "error taking over netlink socket");
+
+ /* 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, "error creating socketpair: %m");
+
+ fd_worker = manager->worker_watch[READ_END];
+
+ r = setsockopt(fd_worker, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
+ if (r < 0)
+ return log_error_errno(errno, "could not enable SO_PASSCRED: %m");
+
+ manager->fd_inotify = udev_watch_init(manager->udev);
+ if (manager->fd_inotify < 0)
+ return log_error_errno(ENOMEM, "error initializing inotify");
+
+ udev_watch_restore(manager->udev);
+
+ /* 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, "could not allocate event loop: %m");
+
+ r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager);
+ if (r < 0)
+ return log_error_errno(r, "error creating sigint event source: %m");
+
+ r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager);
+ if (r < 0)
+ return log_error_errno(r, "error creating sigterm event source: %m");
+
+ r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager);
+ if (r < 0)
+ return log_error_errno(r, "error creating sighup event source: %m");
+
+ r = sd_event_add_signal(manager->event, NULL, SIGCHLD, on_sigchld, manager);
+ if (r < 0)
+ return log_error_errno(r, "error creating sigchld event source: %m");
+
+ r = sd_event_set_watchdog(manager->event, true);
+ if (r < 0)
+ return log_error_errno(r, "error creating watchdog event source: %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, "error creating ctrl 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, "cold not set IDLE event priority for ctrl 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, "error creating inotify event source: %m");
+
+ r = sd_event_add_io(manager->event, &manager->uevent_event, fd_uevent, EPOLLIN, on_uevent, manager);
+ if (r < 0)
+ return log_error_errno(r, "error creating uevent event source: %m");
+
+ r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager);
+ if (r < 0)
+ return log_error_errno(r, "error creating worker event source: %m");
+
+ r = sd_event_add_post(manager->event, NULL, on_post, manager);
+ if (r < 0)
+ return log_error_errno(r, "error creating post event source: %m");
+
+ *ret = manager;
+ manager = NULL;
+
+ return 0;
+}
+
+static int run(int fd_ctrl, int fd_uevent, const char *cgroup) {
+ _cleanup_(manager_freep) Manager *manager = NULL;
+ int r;
+
+ r = manager_new(&manager, fd_ctrl, fd_uevent, cgroup);
+ if (r < 0) {
+ r = log_error_errno(r, "failed to allocate manager object: %m");
+ goto exit;
+ }
+
+ 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_notify(false,
+ "READY=1\n"
+ "STATUS=Processing...");
+
+ r = sd_event_loop(manager->event);
+ if (r < 0) {
+ log_error_errno(r, "event loop failed: %m");
+ goto exit;
+ }
+
+ sd_event_get_exit_code(manager->event, &r);
+
+exit:
+ sd_notify(false,
+ "STOPPING=1\n"
+ "STATUS=Shutting down...");
+ if (manager)
+ udev_ctrl_cleanup(manager->ctrl);
+ return r;
+}
+
+int main(int argc, char *argv[]) {
+ _cleanup_free_ char *cgroup = NULL;
+ int fd_ctrl = -1, fd_uevent = -1;
+ int r;
+
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ goto exit;
+
+ r = parse_proc_cmdline(parse_proc_cmdline_item);
+ 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);
+ }
+
+ if (getuid() != 0) {
+ r = log_error_errno(EPERM, "root privileges required");
+ goto exit;
+ }
+
+ if (arg_children_max == 0) {
+ cpu_set_t cpu_set;
+
+ arg_children_max = 8;
+
+ if (sched_getaffinity(0, sizeof(cpu_set), &cpu_set) == 0)
+ arg_children_max += CPU_COUNT(&cpu_set) * 2;
+
+ log_debug("set children_max to %u", arg_children_max);
+ }
+
+ /* set umask before creating any file/directory */
+ r = chdir("/");
+ if (r < 0) {
+ r = log_error_errno(errno, "could not change dir to /: %m");
+ goto exit;
+ }
+
+ umask(022);
+
+ r = mac_selinux_init();
+ if (r < 0) {
+ log_error_errno(r, "could not initialize labelling: %m");
+ goto exit;
+ }
+
+ r = mkdir("/run/udev", 0755);
+ if (r < 0 && errno != EEXIST) {
+ r = log_error_errno(errno, "could not create /run/udev: %m");
+ goto exit;
+ }
+
+ dev_setup(NULL, UID_INVALID, GID_INVALID);
+
+ if (getppid() == 1) {
+ /* 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 (r == -ENOENT || r == -ENOMEDIUM)
+ log_debug_errno(r, "did not find dedicated cgroup: %m");
+ else
+ log_warning_errno(r, "failed to get cgroup: %m");
+ }
+ }
+
+ r = listen_fds(&fd_ctrl, &fd_uevent);
+ if (r < 0) {
+ r = log_error_errno(r, "could not listen on fds: %m");
+ goto exit;
+ }
+
+ if (arg_daemonize) {
+ pid_t pid;
+
+ log_info("starting version " VERSION);
+
+ /* connect /dev/null to stdin, stdout, stderr */
+ if (log_get_max_level() < LOG_DEBUG)
+ (void) make_null_stdio();
+
+ pid = fork();
+ switch (pid) {
+ case 0:
+ break;
+ case -1:
+ r = log_error_errno(errno, "fork of daemon failed: %m");
+ goto exit;
+ default:
+ mac_selinux_finish();
+ log_close();
+ _exit(EXIT_SUCCESS);
+ }
+
+ setsid();
+
+ write_string_file("/proc/self/oom_score_adj", "-1000", 0);
+ }
+
+ r = run(fd_ctrl, fd_uevent, cgroup);
+
+exit:
+ mac_selinux_finish();
+ log_close();
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}