X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fudev%2Fudevd.c;fp=src%2Fudev%2Fudevd.c;h=0000000000000000000000000000000000000000;hp=8eaf2cdc8c36c602870e8c5bb295a562ee2c42bb;hb=030329f5dcf08fd0a94c8ad6a54836d38ffe2f43;hpb=62a30b2c490512fe22a4e5faacb1d55763ead1e0 diff --git a/src/udev/udevd.c b/src/udev/udevd.c deleted file mode 100644 index 8eaf2cdc8..000000000 --- a/src/udev/udevd.c +++ /dev/null @@ -1,1553 +0,0 @@ -/* - * Copyright (C) 2004-2012 Kay Sievers - * Copyright (C) 2004 Chris Friesen - * Copyright (C) 2009 Canonical Ltd. - * Copyright (C) 2009 Scott James Remnant - * - * 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 . - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "sd-daemon.h" -#include "rtnl-util.h" -#include "cgroup-util.h" -#include "dev-setup.h" -#include "fileio.h" -#include "selinux-util.h" -#include "udev.h" -#include "udev-util.h" - -static struct udev_rules *rules; -static struct udev_ctrl *udev_ctrl; -static struct udev_monitor *monitor; -static int worker_watch[2] = { -1, -1 }; -static int fd_signal = -1; -static int fd_ep = -1; -static int fd_inotify = -1; -static bool stop_exec_queue; -static bool reload; -static int children; -static bool arg_debug = false; -static int arg_daemonize = false; -static int arg_resolve_names = 1; -static int 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; -static sigset_t sigmask_orig; -static UDEV_LIST(event_list); -static UDEV_LIST(worker_list); -static char *udev_cgroup; -static struct udev_list properties_list; -static bool udev_exit; - -enum event_state { - EVENT_UNDEF, - EVENT_QUEUED, - EVENT_RUNNING, -}; - -struct event { - struct udev_list_node node; - struct udev *udev; - struct udev_device *dev; - struct udev_device *dev_kernel; - enum event_state state; - int exitcode; - 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; -}; - -static inline struct event *node_to_event(struct udev_list_node *node) { - return container_of(node, struct event, node); -} - -static void event_queue_cleanup(struct udev *udev, enum event_state type); - -enum worker_state { - WORKER_UNDEF, - WORKER_RUNNING, - WORKER_IDLE, - WORKER_KILLED, -}; - -struct worker { - struct udev_list_node node; - struct udev *udev; - int refcount; - pid_t pid; - struct udev_monitor *monitor; - enum worker_state state; - struct event *event; - usec_t event_start_usec; - bool event_warned; -}; - -/* passed from worker to main process */ -struct worker_message { - pid_t pid; - int exitcode; -}; - -static inline struct worker *node_to_worker(struct udev_list_node *node) { - return container_of(node, struct worker, node); -} - -static void event_queue_delete(struct event *event) { - udev_list_node_remove(&event->node); - udev_device_unref(event->dev); - udev_device_unref(event->dev_kernel); - free(event); -} - -static struct worker *worker_ref(struct worker *worker) { - worker->refcount++; - return worker; -} - -static void worker_cleanup(struct worker *worker) { - udev_list_node_remove(&worker->node); - udev_monitor_unref(worker->monitor); - children--; - free(worker); -} - -static void worker_unref(struct worker *worker) { - worker->refcount--; - if (worker->refcount > 0) - return; - log_debug("worker ["PID_FMT"] cleaned up", worker->pid); - worker_cleanup(worker); -} - -static void worker_list_cleanup(struct udev *udev) { - struct udev_list_node *loop, *tmp; - - udev_list_node_foreach_safe(loop, tmp, &worker_list) { - struct worker *worker = node_to_worker(loop); - - worker_cleanup(worker); - } -} - -static void worker_new(struct event *event) { - struct udev *udev = event->udev; - struct worker *worker; - struct udev_monitor *worker_monitor; - pid_t pid; - - /* 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, monitor); - udev_monitor_enable_receiving(worker_monitor); - - worker = new0(struct worker, 1); - if (worker == NULL) { - udev_monitor_unref(worker_monitor); - return; - } - /* worker + event reference */ - worker->refcount = 2; - worker->udev = udev; - - pid = fork(); - switch (pid) { - case 0: { - struct udev_device *dev = NULL; - int fd_monitor; - _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL; - struct epoll_event ep_signal, ep_monitor; - sigset_t mask; - int rc = EXIT_SUCCESS; - - /* take initial device from queue */ - dev = event->dev; - event->dev = NULL; - - free(worker); - worker_list_cleanup(udev); - event_queue_cleanup(udev, EVENT_UNDEF); - udev_monitor_unref(monitor); - udev_ctrl_unref(udev_ctrl); - close(fd_signal); - close(fd_ep); - close(worker_watch[READ_END]); - - sigfillset(&mask); - fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); - if (fd_signal < 0) { - log_error_errno(errno, "error creating signalfd %m"); - rc = 2; - goto out; - } - - fd_ep = epoll_create1(EPOLL_CLOEXEC); - if (fd_ep < 0) { - log_error_errno(errno, "error creating epoll fd: %m"); - rc = 3; - goto out; - } - - memzero(&ep_signal, sizeof(struct epoll_event)); - ep_signal.events = EPOLLIN; - ep_signal.data.fd = fd_signal; - - fd_monitor = udev_monitor_get_fd(worker_monitor); - memzero(&ep_monitor, sizeof(struct epoll_event)); - ep_monitor.events = EPOLLIN; - ep_monitor.data.fd = fd_monitor; - - 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) { - log_error_errno(errno, "fail to add fds to epoll: %m"); - rc = 4; - goto out; - } - - /* request TERM signal if parent exits */ - prctl(PR_SET_PDEATHSIG, SIGTERM); - - /* reset OOM score, we only protect the main daemon */ - write_string_file("/proc/self/oom_score_adj", "0"); - - for (;;) { - struct udev_event *udev_event; - struct worker_message msg; - int fd_lock = -1; - int err = 0; - - log_debug("seq %llu running", udev_device_get_seqnum(dev)); - udev_event = udev_event_new(dev); - if (udev_event == NULL) { - rc = 5; - goto out; - } - - /* needed for SIGCHLD/SIGTERM in spawn() */ - udev_event->fd_signal = fd_signal; - - 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)); - err = -EAGAIN; - 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, - &properties_list, - rules, - &sigmask_orig); - - udev_event_execute_run(udev_event, - arg_event_timeout_usec, arg_event_timeout_warn_usec, - &sigmask_orig); - - if (udev_event->rtnl) - /* in case rtnl was initialized */ - rtnl = sd_rtnl_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: - /* send udevd the result of the event execution */ - memzero(&msg, sizeof(struct worker_message)); - msg.exitcode = err; - msg.pid = getpid(); - send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0); - - log_debug("seq %llu processed with %i", udev_device_get_seqnum(dev), err); - - udev_device_unref(dev); - dev = NULL; - - if (udev_event->sigterm) { - udev_event_unref(udev_event); - goto out; - } - - 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; - 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); - safe_close(fd_signal); - safe_close(fd_ep); - close(fd_inotify); - close(worker_watch[WRITE_END]); - udev_rules_unref(rules); - udev_builtin_exit(udev); - udev_monitor_unref(worker_monitor); - udev_unref(udev); - log_close(); - exit(rc); - } - case -1: - udev_monitor_unref(worker_monitor); - event->state = EVENT_QUEUED; - free(worker); - log_error_errno(errno, "fork of child failed: %m"); - break; - default: - /* close monitor, but keep address around */ - udev_monitor_disconnect(worker_monitor); - worker->monitor = worker_monitor; - worker->pid = pid; - worker->state = WORKER_RUNNING; - worker->event_start_usec = now(CLOCK_MONOTONIC); - worker->event_warned = false; - worker->event = event; - event->state = EVENT_RUNNING; - udev_list_node_append(&worker->node, &worker_list); - children++; - log_debug("seq %llu forked new worker ["PID_FMT"]", udev_device_get_seqnum(event->dev), pid); - break; - } -} - -static void event_run(struct event *event) { - struct udev_list_node *loop; - - udev_list_node_foreach(loop, &worker_list) { - struct worker *worker = node_to_worker(loop); - ssize_t count; - - if (worker->state != WORKER_IDLE) - continue; - - count = udev_monitor_send_device(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_ref(worker); - worker->event = event; - worker->state = WORKER_RUNNING; - worker->event_start_usec = now(CLOCK_MONOTONIC); - worker->event_warned = false; - event->state = EVENT_RUNNING; - return; - } - - if (children >= arg_children_max) { - if (arg_children_max > 1) - log_debug("maximum number (%i) of children reached", children); - return; - } - - /* start new worker and pass initial device */ - worker_new(event); -} - -static int event_queue_insert(struct udev_device *dev) { - struct event *event; - - event = new0(struct event, 1); - if (event == NULL) - return -1; - - event->udev = udev_device_get_udev(dev); - 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; - udev_list_node_append(&event->node, &event_list); - return 0; -} - -static void worker_kill(struct udev *udev) { - struct udev_list_node *loop; - - udev_list_node_foreach(loop, &worker_list) { - struct worker *worker = node_to_worker(loop); - - 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(struct event *event) { - struct udev_list_node *loop; - size_t common; - - /* check if queue contains events we depend on */ - udev_list_node_foreach(loop, &event_list) { - 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 void event_queue_start(struct udev *udev) { - struct udev_list_node *loop; - - udev_list_node_foreach(loop, &event_list) { - 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(event)) - continue; - - event_run(event); - } -} - -static void event_queue_cleanup(struct udev *udev, enum event_state match_type) { - struct udev_list_node *loop, *tmp; - - udev_list_node_foreach_safe(loop, tmp, &event_list) { - struct event *event = node_to_event(loop); - - if (match_type != EVENT_UNDEF && match_type != event->state) - continue; - - event_queue_delete(event); - } -} - -static void worker_returned(int fd_worker) { - for (;;) { - struct worker_message msg; - ssize_t size; - struct udev_list_node *loop; - - size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT); - if (size != sizeof(struct worker_message)) - break; - - /* lookup worker who sent the signal */ - udev_list_node_foreach(loop, &worker_list) { - struct worker *worker = node_to_worker(loop); - - if (worker->pid != msg.pid) - continue; - - /* worker returned */ - if (worker->event) { - worker->event->exitcode = msg.exitcode; - event_queue_delete(worker->event); - worker->event = NULL; - } - if (worker->state != WORKER_KILLED) - worker->state = WORKER_IDLE; - worker_unref(worker); - break; - } - } -} - -/* receive the udevd message from userspace */ -static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl) { - struct udev *udev = udev_ctrl_get_udev(uctrl); - struct udev_ctrl_connection *ctrl_conn; - struct udev_ctrl_msg *ctrl_msg = NULL; - const char *str; - int i; - - ctrl_conn = udev_ctrl_get_connection(uctrl); - if (ctrl_conn == NULL) - goto out; - - ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); - if (ctrl_msg == NULL) - goto out; - - 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); - worker_kill(udev); - } - - if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { - log_debug("udevd message (STOP_EXEC_QUEUE) received"); - stop_exec_queue = true; - } - - if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { - log_debug("udevd message (START_EXEC_QUEUE) received"); - stop_exec_queue = false; - } - - if (udev_ctrl_get_reload(ctrl_msg) > 0) { - log_debug("udevd message (RELOAD) received"); - reload = true; - } - - str = udev_ctrl_get_set_env(ctrl_msg); - if (str != NULL) { - char *key; - - key = strdup(str); - if (key != NULL) { - 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(&properties_list, key, NULL); - } else { - log_debug("udevd message (ENV) received, set '%s=%s'", key, val); - udev_list_entry_add(&properties_list, key, val); - } - } else { - log_error("wrong key format '%s'", key); - } - free(key); - } - worker_kill(udev); - } - - 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"); - udev_exit = true; - /* keep reference to block the client until we exit */ - udev_ctrl_connection_ref(ctrl_conn); - } -out: - udev_ctrl_msg_unref(ctrl_msg); - return udev_ctrl_connection_unref(ctrl_conn); -} - -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"); - - 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"); - } - - 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"); - - return 0; -} - -static int handle_inotify(struct udev *udev) { - union inotify_event_buffer buffer; - struct inotify_event *e; - ssize_t l; - - l = read(fd_inotify, &buffer, sizeof(buffer)); - if (l < 0) { - if (errno == EAGAIN || errno == EINTR) - return 0; - - return log_error_errno(errno, "Failed to read inotify fd: %m"); - } - - FOREACH_INOTIFY_EVENT(e, buffer, l) { - struct udev_device *dev; - - dev = udev_watch_lookup(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); - else if (e->mask & IN_IGNORED) - udev_watch_end(udev, dev); - - udev_device_unref(dev); - } - - return 0; -} - -static void handle_signal(struct udev *udev, int signo) { - switch (signo) { - case SIGINT: - case SIGTERM: - udev_exit = true; - break; - case SIGCHLD: - for (;;) { - pid_t pid; - int status; - struct udev_list_node *loop, *tmp; - - pid = waitpid(-1, &status, WNOHANG); - if (pid <= 0) - break; - - udev_list_node_foreach_safe(loop, tmp, &worker_list) { - struct worker *worker = node_to_worker(loop); - - if (worker->pid != pid) - continue; - log_debug("worker ["PID_FMT"] exit", pid); - - if (WIFEXITED(status)) { - if (WEXITSTATUS(status) != 0) - log_error("worker ["PID_FMT"] exit with return code %i", - pid, WEXITSTATUS(status)); - } else if (WIFSIGNALED(status)) { - log_error("worker ["PID_FMT"] terminated by signal %i (%s)", - pid, WTERMSIG(status), strsignal(WTERMSIG(status))); - } else if (WIFSTOPPED(status)) { - log_error("worker ["PID_FMT"] stopped", pid); - } else if (WIFCONTINUED(status)) { - log_error("worker ["PID_FMT"] continued", pid); - } else { - log_error("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); - worker->event->exitcode = -32; - /* delete state from disk */ - udev_device_delete_db(worker->event->dev); - udev_device_tag_index(worker->event->dev, NULL, false); - /* forward kernel event without ammending it */ - udev_monitor_send_device(monitor, NULL, worker->event->dev_kernel); - event_queue_delete(worker->event); - - /* drop reference taken for state 'running' */ - worker_unref(worker); - } - } - worker_unref(worker); - break; - } - } - break; - case SIGHUP: - reload = true; - break; - } -} - -static void event_queue_update(void) { - int r; - - if (!udev_list_node_is_empty(&event_list)) { - r = touch("/run/udev/queue"); - if (r < 0) - log_warning_errno(r, "could not touch /run/udev/queue: %m"); - } else { - r = unlink("/run/udev/queue"); - if (r < 0 && errno != ENOENT) - log_warning("could not unlink /run/udev/queue: %m"); - } -} - -static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink) { - int ctrl = -1, netlink = -1; - int fd, n; - - n = sd_listen_fds(true); - if (n <= 0) - return -1; - - 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 >= 0) - return -1; - ctrl = fd; - continue; - } - - if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) { - if (netlink >= 0) - return -1; - netlink = fd; - continue; - } - - return -1; - } - - if (ctrl < 0 || netlink < 0) - return -1; - - log_debug("ctrl=%i netlink=%i", ctrl, netlink); - *rctrl = ctrl; - *rnetlink = netlink; - return 0; -} - -/* - * read the kernel command line, in case we need to get into debug mode - * udev.log-priority= syslog priority - * udev.children-max= events are fully serialized if set to 1 - * udev.exec-delay= delay execution of every executed program - */ -static void kernel_cmdline_options(struct udev *udev) { - _cleanup_free_ char *line = NULL; - const char *word, *state; - size_t l; - int r; - - r = proc_cmdline(&line); - if (r < 0) { - log_warning_errno(r, "Failed to read /proc/cmdline, ignoring: %m"); - return; - } - - FOREACH_WORD_QUOTED(word, l, line, state) { - char *s, *opt, *value; - - s = strndup(word, l); - if (!s) - break; - - /* accept the same options for the initrd, prefixed with "rd." */ - if (in_initrd() && startswith(s, "rd.")) - opt = s + 3; - else - opt = s; - - if ((value = startswith(opt, "udev.log-priority="))) { - int prio; - - prio = util_log_priority(value); - log_set_max_level(prio); - } else if ((value = startswith(opt, "udev.children-max="))) { - r = safe_atoi(value, &arg_children_max); - if (r < 0) - log_warning("Invalid udev.children-max ignored: %s", value); - } else if ((value = startswith(opt, "udev.exec-delay="))) { - r = safe_atoi(value, &arg_exec_delay); - if (r < 0) - log_warning("Invalid udev.exec-delay ignored: %s", value); - } else if ((value = startswith(opt, "udev.event-timeout="))) { - r = safe_atou64(value, &arg_event_timeout_usec); - if (r < 0) { - log_warning("Invalid udev.event-timeout ignored: %s", value); - break; - } - arg_event_timeout_usec *= USEC_PER_SEC; - arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; - } - - free(s); - } -} - -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:DtN:hV", options, NULL)) >= 0) { - int r; - - switch (c) { - - case 'd': - arg_daemonize = true; - break; - case 'c': - r = safe_atoi(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; -} - -int main(int argc, char *argv[]) { - struct udev *udev; - sigset_t mask; - int fd_ctrl = -1; - int fd_netlink = -1; - int fd_worker = -1; - struct epoll_event ep_ctrl = { .events = EPOLLIN }; - struct epoll_event ep_inotify = { .events = EPOLLIN }; - struct epoll_event ep_signal = { .events = EPOLLIN }; - struct epoll_event ep_netlink = { .events = EPOLLIN }; - struct epoll_event ep_worker = { .events = EPOLLIN }; - struct udev_ctrl_connection *ctrl_conn = NULL; - int rc = 1, r; - - udev = udev_new(); - if (udev == NULL) - goto exit; - - log_set_target(LOG_TARGET_AUTO); - log_parse_environment(); - log_open(); - - r = parse_argv(argc, argv); - if (r <= 0) - goto exit; - - kernel_cmdline_options(udev); - - if (arg_debug) - log_set_max_level(LOG_DEBUG); - - if (getuid() != 0) { - log_error("root privileges required"); - goto exit; - } - - r = mac_selinux_init("/dev"); - if (r < 0) { - log_error_errno(r, "could not initialize labelling: %m"); - goto exit; - } - - /* set umask before creating any file/directory */ - r = chdir("/"); - if (r < 0) { - log_error_errno(errno, "could not change dir to /: %m"); - goto exit; - } - - umask(022); - - udev_list_init(udev, &properties_list, true); - - r = mkdir("/run/udev", 0755); - if (r < 0 && errno != EEXIST) { - log_error_errno(errno, "could not create /run/udev: %m"); - goto exit; - } - - dev_setup(NULL); - - /* before opening new files, make sure std{in,out,err} fds are in a sane state */ - if (arg_daemonize) { - int fd; - - fd = open("/dev/null", O_RDWR); - if (fd >= 0) { - if (write(STDOUT_FILENO, 0, 0) < 0) - dup2(fd, STDOUT_FILENO); - if (write(STDERR_FILENO, 0, 0) < 0) - dup2(fd, STDERR_FILENO); - if (fd > STDERR_FILENO) - close(fd); - } else { - log_error("cannot open /dev/null"); - } - } - - if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) { - /* get control and netlink socket from systemd */ - udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl); - if (udev_ctrl == NULL) { - log_error("error taking over udev control socket"); - rc = 1; - goto exit; - } - - monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink); - if (monitor == NULL) { - log_error("error taking over netlink socket"); - rc = 3; - goto exit; - } - - /* get our own cgroup, we regularly kill everything udev has left behind */ - if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0) - udev_cgroup = NULL; - } else { - /* open control and netlink socket */ - udev_ctrl = udev_ctrl_new(udev); - if (udev_ctrl == NULL) { - log_error("error initializing udev control socket"); - rc = 1; - goto exit; - } - fd_ctrl = udev_ctrl_get_fd(udev_ctrl); - - monitor = udev_monitor_new_from_netlink(udev, "kernel"); - if (monitor == NULL) { - log_error("error initializing netlink socket"); - rc = 3; - goto exit; - } - fd_netlink = udev_monitor_get_fd(monitor); - - udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024); - } - - if (udev_monitor_enable_receiving(monitor) < 0) { - log_error("error binding netlink socket"); - rc = 3; - goto exit; - } - - if (udev_ctrl_enable_receiving(udev_ctrl) < 0) { - log_error("error binding udev control socket"); - rc = 1; - goto exit; - } - - log_info("starting version " VERSION); - - udev_builtin_init(udev); - - rules = udev_rules_new(udev, arg_resolve_names); - if (rules == NULL) { - log_error("error reading rules"); - goto exit; - } - - rc = udev_rules_apply_static_dev_perms(rules); - if (rc < 0) - log_error_errno(rc, "failed to apply permissions on static device nodes - %m"); - - if (arg_daemonize) { - pid_t pid; - - pid = fork(); - switch (pid) { - case 0: - break; - case -1: - log_error_errno(errno, "fork of daemon failed: %m"); - rc = 4; - goto exit; - default: - rc = EXIT_SUCCESS; - goto exit_daemonize; - } - - setsid(); - - write_string_file("/proc/self/oom_score_adj", "-1000"); - } else { - sd_notify(1, "READY=1"); - } - - 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); - - udev_list_node_init(&event_list); - udev_list_node_init(&worker_list); - - fd_inotify = udev_watch_init(udev); - if (fd_inotify < 0) { - log_error("error initializing inotify"); - rc = 4; - goto exit; - } - udev_watch_restore(udev); - - /* block and listen to all signals on signalfd */ - sigfillset(&mask); - sigprocmask(SIG_SETMASK, &mask, &sigmask_orig); - fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); - if (fd_signal < 0) { - log_error("error creating signalfd"); - rc = 5; - goto exit; - } - - /* unnamed socket from workers to the main daemon */ - if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) { - log_error("error creating socketpair"); - rc = 6; - goto exit; - } - fd_worker = worker_watch[READ_END]; - - ep_ctrl.data.fd = fd_ctrl; - ep_inotify.data.fd = fd_inotify; - ep_signal.data.fd = fd_signal; - ep_netlink.data.fd = fd_netlink; - ep_worker.data.fd = fd_worker; - - fd_ep = epoll_create1(EPOLL_CLOEXEC); - if (fd_ep < 0) { - log_error_errno(errno, "error creating epoll fd: %m"); - goto exit; - } - if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 || - epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 || - epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || - epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 || - epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) { - log_error_errno(errno, "fail to add fds to epoll: %m"); - goto exit; - } - - for (;;) { - static usec_t last_usec; - struct epoll_event ev[8]; - int fdcount; - int timeout; - bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl; - int i; - - if (udev_exit) { - /* close sources of new events and discard buffered events */ - if (fd_ctrl >= 0) { - epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL); - fd_ctrl = -1; - } - if (monitor != NULL) { - epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL); - udev_monitor_unref(monitor); - monitor = NULL; - } - if (fd_inotify >= 0) { - epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL); - close(fd_inotify); - fd_inotify = -1; - } - - /* discard queued events and kill workers */ - event_queue_cleanup(udev, EVENT_QUEUED); - worker_kill(udev); - - /* exit after all has cleaned up */ - if (udev_list_node_is_empty(&event_list) && children == 0) - break; - - /* timeout at exit for workers to finish */ - timeout = 30 * MSEC_PER_SEC; - } else if (udev_list_node_is_empty(&event_list) && children == 0) { - /* we are idle */ - timeout = -1; - - /* cleanup possible left-over processes in our cgroup */ - if (udev_cgroup) - cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL); - } else { - /* kill idle or hanging workers */ - timeout = 3 * MSEC_PER_SEC; - } - - /* tell settle that we are busy or idle */ - event_queue_update(); - - fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout); - if (fdcount < 0) - continue; - - if (fdcount == 0) { - struct udev_list_node *loop; - - /* timeout */ - if (udev_exit) { - log_error("timeout, giving up waiting for workers to finish"); - break; - } - - /* kill idle workers */ - if (udev_list_node_is_empty(&event_list)) { - log_debug("cleanup idle workers"); - worker_kill(udev); - } - - /* check for hanging events */ - udev_list_node_foreach(loop, &worker_list) { - struct worker *worker = node_to_worker(loop); - usec_t ts; - - if (worker->state != WORKER_RUNNING) - continue; - - ts = now(CLOCK_MONOTONIC); - - if ((ts - worker->event_start_usec) > arg_event_timeout_warn_usec) { - if ((ts - worker->event_start_usec) > arg_event_timeout_usec) { - log_error("worker ["PID_FMT"] %s timeout; kill it", worker->pid, worker->event->devpath); - kill(worker->pid, SIGKILL); - worker->state = WORKER_KILLED; - - log_error("seq %llu '%s' killed", udev_device_get_seqnum(worker->event->dev), worker->event->devpath); - worker->event->exitcode = -64; - } else if (!worker->event_warned) { - log_warning("worker ["PID_FMT"] %s is taking a long time", worker->pid, worker->event->devpath); - worker->event_warned = true; - } - } - } - - } - - is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false; - for (i = 0; i < fdcount; i++) { - if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN) - is_worker = true; - else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN) - is_netlink = true; - else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) - is_signal = true; - else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN) - is_inotify = true; - else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN) - is_ctrl = true; - } - - /* check for changed config, every 3 seconds at most */ - if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * USEC_PER_SEC) { - if (udev_rules_check_timestamp(rules)) - reload = true; - if (udev_builtin_validate(udev)) - reload = true; - - last_usec = now(CLOCK_MONOTONIC); - } - - /* reload requested, HUP signal received, rules changed, builtin changed */ - if (reload) { - worker_kill(udev); - rules = udev_rules_unref(rules); - udev_builtin_exit(udev); - reload = false; - } - - /* event has finished */ - if (is_worker) - worker_returned(fd_worker); - - if (is_netlink) { - struct udev_device *dev; - - dev = udev_monitor_receive_device(monitor); - if (dev) { - udev_device_ensure_usec_initialized(dev, NULL); - if (event_queue_insert(dev) < 0) - udev_device_unref(dev); - } - } - - /* start new events */ - if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) { - udev_builtin_init(udev); - if (rules == NULL) - rules = udev_rules_new(udev, arg_resolve_names); - if (rules != NULL) - event_queue_start(udev); - } - - if (is_signal) { - struct signalfd_siginfo fdsi; - ssize_t size; - - size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); - if (size == sizeof(struct signalfd_siginfo)) - handle_signal(udev, fdsi.ssi_signo); - } - - /* we are shutting down, the events below are not handled anymore */ - if (udev_exit) - continue; - - /* device node watch */ - if (is_inotify) - handle_inotify(udev); - - /* tell settle that we are busy or idle, this needs to be before the - * PING handling - */ - event_queue_update(); - - /* - * This needs to be after the inotify handling, to make sure, - * that the ping is send back after the possibly generated - * "change" events by the inotify device node watch. - * - * A single time we may receive a client connection which we need to - * keep open to block the client. It will be closed right before we - * exit. - */ - if (is_ctrl) - ctrl_conn = handle_ctrl_msg(udev_ctrl); - } - - rc = EXIT_SUCCESS; -exit: - udev_ctrl_cleanup(udev_ctrl); - unlink("/run/udev/queue"); -exit_daemonize: - if (fd_ep >= 0) - close(fd_ep); - worker_list_cleanup(udev); - event_queue_cleanup(udev, EVENT_UNDEF); - udev_rules_unref(rules); - udev_builtin_exit(udev); - if (fd_signal >= 0) - close(fd_signal); - if (worker_watch[READ_END] >= 0) - close(worker_watch[READ_END]); - if (worker_watch[WRITE_END] >= 0) - close(worker_watch[WRITE_END]); - udev_monitor_unref(monitor); - udev_ctrl_connection_unref(ctrl_conn); - udev_ctrl_unref(udev_ctrl); - udev_list_cleanup(&properties_list); - mac_selinux_finish(); - udev_unref(udev); - log_close(); - return rc; -}