+++ /dev/null
-/*
- * 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 <stddef.h>
-#include <signal.h>
-#include <unistd.h>
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdbool.h>
-#include <string.h>
-#include <fcntl.h>
-#include <getopt.h>
-#include <sys/file.h>
-#include <sys/time.h>
-#include <sys/prctl.h>
-#include <sys/socket.h>
-#include <sys/signalfd.h>
-#include <sys/epoll.h>
-#include <sys/mount.h>
-#include <sys/wait.h>
-#include <sys/stat.h>
-#include <sys/ioctl.h>
-#include <sys/inotify.h>
-
-#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=<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
- */
-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;
-}
~ianmdlvl / elogind.git / blobdiff