mirror of
https://github.com/systemd/systemd-stable.git
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1121 lines
28 KiB
C
1121 lines
28 KiB
C
/*
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* Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
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* Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <stddef.h>
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#include <signal.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <syslog.h>
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#include <time.h>
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#include <getopt.h>
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#include <sys/select.h>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <linux/types.h>
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#include <linux/netlink.h>
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#ifdef HAVE_INOTIFY
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#include <sys/inotify.h>
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#endif
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#include "udev.h"
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#include "udev_rules.h"
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#define UDEVD_PRIORITY -4
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#define UDEV_PRIORITY -2
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/* maximum limit of forked childs */
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#define UDEVD_MAX_CHILDS 256
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static int debug;
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static void log_fn(struct udev *udev, int priority,
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const char *file, int line, const char *fn,
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const char *format, va_list args)
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{
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if (debug) {
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fprintf(stderr, "[%d] %s: ", (int) getpid(), fn);
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vfprintf(stderr, format, args);
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} else {
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vsyslog(priority, format, args);
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}
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}
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struct udevd_uevent_msg {
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struct udev *udev;
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struct list_head node;
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pid_t pid;
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int exitstatus;
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time_t queue_time;
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char *action;
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char *devpath;
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char *subsystem;
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char *driver;
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dev_t devt;
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unsigned long long seqnum;
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char *devpath_old;
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char *physdevpath;
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unsigned int timeout;
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char *envp[UEVENT_NUM_ENVP+1];
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char envbuf[];
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};
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static int debug_trace;
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static struct udev_rules rules;
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static struct udev_ctrl *udev_ctrl;
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static int uevent_netlink_sock = -1;
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static int inotify_fd = -1;
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static int signal_pipe[2] = {-1, -1};
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static volatile int sigchilds_waiting;
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static volatile int udev_exit;
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static volatile int reload_config;
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static int run_exec_q;
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static int stop_exec_q;
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static int max_childs;
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static char udev_log_env[32];
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static LIST_HEAD(exec_list);
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static LIST_HEAD(running_list);
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static void asmlinkage udev_event_sig_handler(int signum)
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{
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if (signum == SIGALRM)
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exit(1);
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}
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static int udev_event_process(struct udevd_uevent_msg *msg)
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{
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struct sigaction act;
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struct udevice *udevice;
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int i;
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int retval;
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/* set signal handlers */
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memset(&act, 0x00, sizeof(act));
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act.sa_handler = (void (*)(int)) udev_event_sig_handler;
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sigemptyset (&act.sa_mask);
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act.sa_flags = 0;
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sigaction(SIGALRM, &act, NULL);
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/* reset to default */
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act.sa_handler = SIG_DFL;
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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sigaction(SIGCHLD, &act, NULL);
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sigaction(SIGHUP, &act, NULL);
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/* trigger timeout to prevent hanging processes */
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alarm(UDEV_EVENT_TIMEOUT);
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/* reconstruct event environment from message */
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for (i = 0; msg->envp[i]; i++)
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putenv(msg->envp[i]);
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udevice = udev_device_init(msg->udev);
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if (udevice == NULL)
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return -1;
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strlcpy(udevice->action, msg->action, sizeof(udevice->action));
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sysfs_device_set_values(udevice->udev, udevice->dev, msg->devpath, msg->subsystem, msg->driver);
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udevice->devpath_old = msg->devpath_old;
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udevice->devt = msg->devt;
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retval = udev_device_event(&rules, udevice);
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/* rules may change/disable the timeout */
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if (udevice->event_timeout >= 0)
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alarm(udevice->event_timeout);
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/* run programs collected by RUN-key*/
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if (retval == 0 && !udevice->ignore_device && udev_get_run(msg->udev))
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retval = udev_rules_run(udevice);
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udev_device_cleanup(udevice);
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return retval;
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}
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enum event_state {
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EVENT_QUEUED,
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EVENT_FINISHED,
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EVENT_FAILED,
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};
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static void export_event_state(struct udevd_uevent_msg *msg, enum event_state state)
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{
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char filename[PATH_SIZE];
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char filename_failed[PATH_SIZE];
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size_t start;
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/* location of queue file */
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snprintf(filename, sizeof(filename), "%s/.udev/queue/%llu", udev_get_dev_path(msg->udev), msg->seqnum);
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/* location of failed file */
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strlcpy(filename_failed, udev_get_dev_path(msg->udev), sizeof(filename_failed));
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strlcat(filename_failed, "/", sizeof(filename_failed));
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start = strlcat(filename_failed, ".udev/failed/", sizeof(filename_failed));
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strlcat(filename_failed, msg->devpath, sizeof(filename_failed));
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path_encode(&filename_failed[start], sizeof(filename_failed) - start);
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switch (state) {
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case EVENT_QUEUED:
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unlink(filename_failed);
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delete_path(msg->udev, filename_failed);
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create_path(msg->udev, filename);
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udev_selinux_setfscreatecon(msg->udev, filename, S_IFLNK);
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symlink(msg->devpath, filename);
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udev_selinux_resetfscreatecon(msg->udev);
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break;
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case EVENT_FINISHED:
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if (msg->devpath_old != NULL) {
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/* "move" event - rename failed file to current name, do not delete failed */
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char filename_failed_old[PATH_SIZE];
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strlcpy(filename_failed_old, udev_get_dev_path(msg->udev), sizeof(filename_failed_old));
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strlcat(filename_failed_old, "/", sizeof(filename_failed_old));
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start = strlcat(filename_failed_old, ".udev/failed/", sizeof(filename_failed_old));
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strlcat(filename_failed_old, msg->devpath_old, sizeof(filename_failed_old));
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path_encode(&filename_failed_old[start], sizeof(filename) - start);
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if (rename(filename_failed_old, filename_failed) == 0)
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info(msg->udev, "renamed devpath, moved failed state of '%s' to %s'\n",
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msg->devpath_old, msg->devpath);
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} else {
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unlink(filename_failed);
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delete_path(msg->udev, filename_failed);
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}
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unlink(filename);
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delete_path(msg->udev, filename);
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break;
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case EVENT_FAILED:
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/* move failed event to the failed directory */
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create_path(msg->udev, filename_failed);
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rename(filename, filename_failed);
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/* clean up possibly empty queue directory */
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delete_path(msg->udev, filename);
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break;
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}
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return;
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}
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static void msg_queue_delete(struct udevd_uevent_msg *msg)
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{
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list_del(&msg->node);
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/* mark as failed, if "add" event returns non-zero */
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if (msg->exitstatus && strcmp(msg->action, "add") == 0)
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export_event_state(msg, EVENT_FAILED);
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else
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export_event_state(msg, EVENT_FINISHED);
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free(msg);
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}
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static void udev_event_run(struct udevd_uevent_msg *msg)
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{
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pid_t pid;
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int retval;
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pid = fork();
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switch (pid) {
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case 0:
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/* child */
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close(uevent_netlink_sock);
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udev_ctrl_unref(udev_ctrl);
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if (inotify_fd >= 0)
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close(inotify_fd);
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close(signal_pipe[READ_END]);
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close(signal_pipe[WRITE_END]);
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logging_close();
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logging_init("udevd-event");
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setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY);
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retval = udev_event_process(msg);
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info(msg->udev, "seq %llu finished with %i\n", msg->seqnum, retval);
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logging_close();
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if (retval)
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exit(1);
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exit(0);
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case -1:
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err(msg->udev, "fork of child failed: %s\n", strerror(errno));
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msg_queue_delete(msg);
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break;
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default:
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/* get SIGCHLD in main loop */
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info(msg->udev, "seq %llu forked, pid [%d], '%s' '%s', %ld seconds old\n",
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msg->seqnum, pid, msg->action, msg->subsystem, time(NULL) - msg->queue_time);
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msg->pid = pid;
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}
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}
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static void msg_queue_insert(struct udevd_uevent_msg *msg)
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{
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char filename[PATH_SIZE];
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int fd;
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msg->queue_time = time(NULL);
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export_event_state(msg, EVENT_QUEUED);
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info(msg->udev, "seq %llu queued, '%s' '%s'\n", msg->seqnum, msg->action, msg->subsystem);
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strlcpy(filename, udev_get_dev_path(msg->udev), sizeof(filename));
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strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
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fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
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if (fd >= 0) {
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char str[32];
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int len;
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len = sprintf(str, "%llu\n", msg->seqnum);
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write(fd, str, len);
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close(fd);
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}
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/* run one event after the other in debug mode */
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if (debug_trace) {
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list_add_tail(&msg->node, &running_list);
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udev_event_run(msg);
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waitpid(msg->pid, NULL, 0);
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msg_queue_delete(msg);
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return;
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}
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/* run all events with a timeout set immediately */
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if (msg->timeout != 0) {
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list_add_tail(&msg->node, &running_list);
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udev_event_run(msg);
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return;
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}
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list_add_tail(&msg->node, &exec_list);
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run_exec_q = 1;
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}
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static int mem_size_mb(void)
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{
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FILE* f;
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char buf[4096];
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long int memsize = -1;
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f = fopen("/proc/meminfo", "r");
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if (f == NULL)
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return -1;
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while (fgets(buf, sizeof(buf), f) != NULL) {
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long int value;
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if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) {
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memsize = value / 1024;
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break;
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}
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}
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fclose(f);
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return memsize;
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}
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static int compare_devpath(const char *running, const char *waiting)
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{
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int i;
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for (i = 0; i < PATH_SIZE; i++) {
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/* identical device event found */
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if (running[i] == '\0' && waiting[i] == '\0')
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return 1;
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/* parent device event found */
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if (running[i] == '\0' && waiting[i] == '/')
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return 2;
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/* child device event found */
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if (running[i] == '/' && waiting[i] == '\0')
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return 3;
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/* no matching event */
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if (running[i] != waiting[i])
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break;
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}
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return 0;
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}
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/* lookup event for identical, parent, child, or physical device */
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static int devpath_busy(struct udevd_uevent_msg *msg, int limit)
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{
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struct udevd_uevent_msg *loop_msg;
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int childs_count = 0;
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/* check exec-queue which may still contain delayed events we depend on */
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list_for_each_entry(loop_msg, &exec_list, node) {
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/* skip ourself and all later events */
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if (loop_msg->seqnum >= msg->seqnum)
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break;
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/* check our old name */
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if (msg->devpath_old != NULL)
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if (strcmp(loop_msg->devpath , msg->devpath_old) == 0)
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return 2;
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/* check identical, parent, or child device event */
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if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) {
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dbg(msg->udev, "%llu, device event still pending %llu (%s)\n",
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msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
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return 3;
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}
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/* check for our major:minor number */
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if (msg->devt && loop_msg->devt == msg->devt &&
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strcmp(msg->subsystem, loop_msg->subsystem) == 0) {
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dbg(msg->udev, "%llu, device event still pending %llu (%d:%d)\n", msg->seqnum,
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loop_msg->seqnum, major(loop_msg->devt), minor(loop_msg->devt));
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return 4;
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}
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/* check physical device event (special case of parent) */
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if (msg->physdevpath && msg->action && strcmp(msg->action, "add") == 0)
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if (compare_devpath(loop_msg->devpath, msg->physdevpath) != 0) {
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dbg(msg->udev, "%llu, physical device event still pending %llu (%s)\n",
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msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
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return 5;
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}
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}
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/* check run queue for still running events */
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list_for_each_entry(loop_msg, &running_list, node) {
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childs_count++;
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if (childs_count++ >= limit) {
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info(msg->udev, "%llu, maximum number (%i) of childs reached\n", msg->seqnum, childs_count);
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return 1;
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}
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/* check our old name */
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if (msg->devpath_old != NULL)
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if (strcmp(loop_msg->devpath , msg->devpath_old) == 0)
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return 2;
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/* check identical, parent, or child device event */
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if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) {
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dbg(msg->udev, "%llu, device event still running %llu (%s)\n",
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msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
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return 3;
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}
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/* check for our major:minor number */
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if (msg->devt && loop_msg->devt == msg->devt &&
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strcmp(msg->subsystem, loop_msg->subsystem) == 0) {
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dbg(msg->udev, "%llu, device event still running %llu (%d:%d)\n", msg->seqnum,
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loop_msg->seqnum, major(loop_msg->devt), minor(loop_msg->devt));
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return 4;
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}
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/* check physical device event (special case of parent) */
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if (msg->physdevpath && msg->action && strcmp(msg->action, "add") == 0)
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if (compare_devpath(loop_msg->devpath, msg->physdevpath) != 0) {
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dbg(msg->udev, "%llu, physical device event still running %llu (%s)\n",
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msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
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return 5;
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}
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}
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return 0;
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}
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/* serializes events for the identical and parent and child devices */
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static void msg_queue_manager(struct udev *udev)
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{
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struct udevd_uevent_msg *loop_msg;
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struct udevd_uevent_msg *tmp_msg;
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if (list_empty(&exec_list))
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return;
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list_for_each_entry_safe(loop_msg, tmp_msg, &exec_list, node) {
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/* serialize and wait for parent or child events */
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if (devpath_busy(loop_msg, max_childs) != 0) {
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dbg(udev, "delay seq %llu (%s)\n", loop_msg->seqnum, loop_msg->devpath);
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continue;
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}
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/* move event to run list */
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list_move_tail(&loop_msg->node, &running_list);
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udev_event_run(loop_msg);
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dbg(udev, "moved seq %llu to running list\n", loop_msg->seqnum);
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}
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}
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static struct udevd_uevent_msg *get_msg_from_envbuf(struct udev *udev, const char *buf, int buf_size)
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{
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int bufpos;
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int i;
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struct udevd_uevent_msg *msg;
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char *physdevdriver_key = NULL;
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int maj = 0;
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int min = 0;
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msg = malloc(sizeof(struct udevd_uevent_msg) + buf_size);
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if (msg == NULL)
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return NULL;
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memset(msg, 0x00, sizeof(struct udevd_uevent_msg) + buf_size);
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msg->udev = udev;
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/* copy environment buffer and reconstruct envp */
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memcpy(msg->envbuf, buf, buf_size);
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bufpos = 0;
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for (i = 0; (bufpos < buf_size) && (i < UEVENT_NUM_ENVP-2); i++) {
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int keylen;
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char *key;
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key = &msg->envbuf[bufpos];
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keylen = strlen(key);
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msg->envp[i] = key;
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|
bufpos += keylen + 1;
|
|
dbg(udev, "add '%s' to msg.envp[%i]\n", msg->envp[i], i);
|
|
|
|
/* remember some keys for further processing */
|
|
if (strncmp(key, "ACTION=", 7) == 0)
|
|
msg->action = &key[7];
|
|
else if (strncmp(key, "DEVPATH=", 8) == 0)
|
|
msg->devpath = &key[8];
|
|
else if (strncmp(key, "SUBSYSTEM=", 10) == 0)
|
|
msg->subsystem = &key[10];
|
|
else if (strncmp(key, "DRIVER=", 7) == 0)
|
|
msg->driver = &key[7];
|
|
else if (strncmp(key, "SEQNUM=", 7) == 0)
|
|
msg->seqnum = strtoull(&key[7], NULL, 10);
|
|
else if (strncmp(key, "DEVPATH_OLD=", 12) == 0)
|
|
msg->devpath_old = &key[12];
|
|
else if (strncmp(key, "PHYSDEVPATH=", 12) == 0)
|
|
msg->physdevpath = &key[12];
|
|
else if (strncmp(key, "PHYSDEVDRIVER=", 14) == 0)
|
|
physdevdriver_key = key;
|
|
else if (strncmp(key, "MAJOR=", 6) == 0)
|
|
maj = strtoull(&key[6], NULL, 10);
|
|
else if (strncmp(key, "MINOR=", 6) == 0)
|
|
min = strtoull(&key[6], NULL, 10);
|
|
else if (strncmp(key, "TIMEOUT=", 8) == 0)
|
|
msg->timeout = strtoull(&key[8], NULL, 10);
|
|
}
|
|
msg->devt = makedev(maj, min);
|
|
msg->envp[i++] = "UDEVD_EVENT=1";
|
|
|
|
if (msg->driver == NULL && msg->physdevpath == NULL && physdevdriver_key != NULL) {
|
|
/* for older kernels DRIVER is empty for a bus device, export PHYSDEVDRIVER as DRIVER */
|
|
msg->envp[i++] = &physdevdriver_key[7];
|
|
msg->driver = &physdevdriver_key[14];
|
|
}
|
|
|
|
msg->envp[i] = NULL;
|
|
|
|
if (msg->devpath == NULL || msg->action == NULL) {
|
|
info(udev, "DEVPATH or ACTION missing, ignore message\n");
|
|
free(msg);
|
|
return NULL;
|
|
}
|
|
return msg;
|
|
}
|
|
|
|
/* receive the udevd message from userspace */
|
|
static void handle_ctrl_msg(struct udev_ctrl *uctrl)
|
|
{
|
|
struct udev *udev = udev_ctrl_get_udev(uctrl);
|
|
struct udev_ctrl_msg *ctrl_msg;
|
|
const char *str;
|
|
int i;
|
|
|
|
ctrl_msg = udev_ctrl_receive_msg(uctrl);
|
|
if (ctrl_msg == NULL)
|
|
return;
|
|
|
|
i = udev_ctrl_get_set_log_level(ctrl_msg);
|
|
if (i >= 0) {
|
|
info(udev, "udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i);
|
|
udev_set_log_priority(udev, i);
|
|
sprintf(udev_log_env, "UDEV_LOG=%i", i);
|
|
putenv(udev_log_env);
|
|
}
|
|
|
|
if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) {
|
|
info(udev, "udevd message (STOP_EXEC_QUEUE) received\n");
|
|
stop_exec_q = 1;
|
|
}
|
|
|
|
if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) {
|
|
info(udev, "udevd message (START_EXEC_QUEUE) received\n");
|
|
stop_exec_q = 0;
|
|
msg_queue_manager(udev);
|
|
}
|
|
|
|
if (udev_ctrl_get_reload_rules(ctrl_msg) > 0) {
|
|
info(udev, "udevd message (RELOAD_RULES) received\n");
|
|
reload_config = 1;
|
|
}
|
|
|
|
str = udev_ctrl_get_set_env(ctrl_msg);
|
|
if (str != NULL) {
|
|
char *key = strdup(str);
|
|
char *val;
|
|
|
|
val = strchr(str, '=');
|
|
if (val != NULL) {
|
|
val[0] = '\0';
|
|
val = &val[1];
|
|
if (val[0] == '\0') {
|
|
info(udev, "udevd message (ENV) received, unset '%s'\n", key);
|
|
unsetenv(str);
|
|
} else {
|
|
info(udev, "udevd message (ENV) received, set '%s=%s'\n", key, val);
|
|
setenv(key, val, 1);
|
|
}
|
|
} else {
|
|
err(udev, "wrong key format '%s'\n", key);
|
|
}
|
|
free(key);
|
|
}
|
|
|
|
i = udev_ctrl_get_set_max_childs(ctrl_msg);
|
|
if (i >= 0) {
|
|
info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i);
|
|
max_childs = i;
|
|
}
|
|
|
|
udev_ctrl_msg_unref(ctrl_msg);
|
|
}
|
|
|
|
/* receive the kernel user event message and do some sanity checks */
|
|
static struct udevd_uevent_msg *get_netlink_msg(struct udev *udev)
|
|
{
|
|
struct udevd_uevent_msg *msg;
|
|
int bufpos;
|
|
ssize_t size;
|
|
static char buffer[UEVENT_BUFFER_SIZE+512];
|
|
char *pos;
|
|
|
|
size = recv(uevent_netlink_sock, &buffer, sizeof(buffer), 0);
|
|
if (size < 0) {
|
|
if (errno != EINTR)
|
|
err(udev, "unable to receive kernel netlink message: %s\n", strerror(errno));
|
|
return NULL;
|
|
}
|
|
|
|
if ((size_t)size > sizeof(buffer)-1)
|
|
size = sizeof(buffer)-1;
|
|
buffer[size] = '\0';
|
|
dbg(udev, "uevent_size=%zi\n", size);
|
|
|
|
/* start of event payload */
|
|
bufpos = strlen(buffer)+1;
|
|
msg = get_msg_from_envbuf(udev, &buffer[bufpos], size-bufpos);
|
|
if (msg == NULL)
|
|
return NULL;
|
|
|
|
/* validate message */
|
|
pos = strchr(buffer, '@');
|
|
if (pos == NULL) {
|
|
err(udev, "invalid uevent '%s'\n", buffer);
|
|
free(msg);
|
|
return NULL;
|
|
}
|
|
pos[0] = '\0';
|
|
|
|
if (msg->action == NULL) {
|
|
info(udev, "no ACTION in payload found, skip event '%s'\n", buffer);
|
|
free(msg);
|
|
return NULL;
|
|
}
|
|
|
|
if (strcmp(msg->action, buffer) != 0) {
|
|
err(udev, "ACTION in payload does not match uevent, skip event '%s'\n", buffer);
|
|
free(msg);
|
|
return NULL;
|
|
}
|
|
|
|
return msg;
|
|
}
|
|
|
|
static void asmlinkage sig_handler(int signum)
|
|
{
|
|
switch (signum) {
|
|
case SIGINT:
|
|
case SIGTERM:
|
|
udev_exit = 1;
|
|
break;
|
|
case SIGCHLD:
|
|
/* set flag, then write to pipe if needed */
|
|
sigchilds_waiting = 1;
|
|
break;
|
|
case SIGHUP:
|
|
reload_config = 1;
|
|
break;
|
|
}
|
|
|
|
/* write to pipe, which will wakeup select() in our mainloop */
|
|
write(signal_pipe[WRITE_END], "", 1);
|
|
}
|
|
|
|
static void udev_done(int pid, int exitstatus)
|
|
{
|
|
/* find msg associated with pid and delete it */
|
|
struct udevd_uevent_msg *msg;
|
|
|
|
list_for_each_entry(msg, &running_list, node) {
|
|
if (msg->pid == pid) {
|
|
info(msg->udev, "seq %llu, pid [%d] exit with %i, %ld seconds old\n", msg->seqnum, msg->pid,
|
|
exitstatus, time(NULL) - msg->queue_time);
|
|
msg->exitstatus = exitstatus;
|
|
msg_queue_delete(msg);
|
|
|
|
/* there may be events waiting with the same devpath */
|
|
run_exec_q = 1;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void reap_sigchilds(void)
|
|
{
|
|
pid_t pid;
|
|
int status;
|
|
|
|
while (1) {
|
|
pid = waitpid(-1, &status, WNOHANG);
|
|
if (pid <= 0)
|
|
break;
|
|
if (WIFEXITED(status))
|
|
status = WEXITSTATUS(status);
|
|
else if (WIFSIGNALED(status))
|
|
status = WTERMSIG(status) + 128;
|
|
else
|
|
status = 0;
|
|
udev_done(pid, status);
|
|
}
|
|
}
|
|
|
|
static int init_uevent_netlink_sock(struct udev *udev)
|
|
{
|
|
struct sockaddr_nl snl;
|
|
const int buffersize = 16 * 1024 * 1024;
|
|
int retval;
|
|
|
|
memset(&snl, 0x00, sizeof(struct sockaddr_nl));
|
|
snl.nl_family = AF_NETLINK;
|
|
snl.nl_pid = getpid();
|
|
snl.nl_groups = 1;
|
|
|
|
uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
|
|
if (uevent_netlink_sock == -1) {
|
|
err(udev, "error getting socket: %s\n", strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
/* set receive buffersize */
|
|
setsockopt(uevent_netlink_sock, SOL_SOCKET, SO_RCVBUFFORCE, &buffersize, sizeof(buffersize));
|
|
|
|
retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl, sizeof(struct sockaddr_nl));
|
|
if (retval < 0) {
|
|
err(udev, "bind failed: %s\n", strerror(errno));
|
|
close(uevent_netlink_sock);
|
|
uevent_netlink_sock = -1;
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void export_initial_seqnum(struct udev *udev)
|
|
{
|
|
char filename[PATH_SIZE];
|
|
int fd;
|
|
char seqnum[32];
|
|
ssize_t len = 0;
|
|
|
|
strlcpy(filename, udev_get_sys_path(udev), sizeof(filename));
|
|
strlcat(filename, "/kernel/uevent_seqnum", sizeof(filename));
|
|
fd = open(filename, O_RDONLY);
|
|
if (fd >= 0) {
|
|
len = read(fd, seqnum, sizeof(seqnum)-1);
|
|
close(fd);
|
|
}
|
|
if (len <= 0) {
|
|
strcpy(seqnum, "0\n");
|
|
len = 3;
|
|
}
|
|
strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
|
|
strlcat(filename, "/.udev/uevent_seqnum", sizeof(filename));
|
|
create_path(udev, filename);
|
|
fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644);
|
|
if (fd >= 0) {
|
|
write(fd, seqnum, len);
|
|
close(fd);
|
|
}
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
struct udev *udev;
|
|
int retval;
|
|
int fd;
|
|
struct sigaction act;
|
|
fd_set readfds;
|
|
const char *value;
|
|
int daemonize = 0;
|
|
static const struct option options[] = {
|
|
{ "daemon", 0, NULL, 'd' },
|
|
{ "debug-trace", 0, NULL, 't' },
|
|
{ "debug", 0, NULL, 'D' },
|
|
{ "help", 0, NULL, 'h' },
|
|
{ "version", 0, NULL, 'V' },
|
|
{}
|
|
};
|
|
int rc = 1;
|
|
int maxfd;
|
|
|
|
udev = udev_new();
|
|
if (udev == NULL)
|
|
goto exit;
|
|
|
|
logging_init("udevd");
|
|
udev_set_log_fn(udev, log_fn);
|
|
dbg(udev, "version %s\n", VERSION);
|
|
|
|
while (1) {
|
|
int option;
|
|
|
|
option = getopt_long(argc, argv, "dDthV", options, NULL);
|
|
if (option == -1)
|
|
break;
|
|
|
|
switch (option) {
|
|
case 'd':
|
|
daemonize = 1;
|
|
break;
|
|
case 't':
|
|
debug_trace = 1;
|
|
break;
|
|
case 'D':
|
|
debug = 1;
|
|
if (udev_get_log_priority(udev) < LOG_INFO)
|
|
udev_set_log_priority(udev, LOG_INFO);
|
|
break;
|
|
case 'h':
|
|
printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] [--version]\n");
|
|
goto exit;
|
|
case 'V':
|
|
printf("%s\n", VERSION);
|
|
goto exit;
|
|
default:
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
if (getuid() != 0) {
|
|
fprintf(stderr, "root privileges required\n");
|
|
err(udev, "root privileges required\n");
|
|
goto exit;
|
|
}
|
|
|
|
/* make sure std{in,out,err} fd's are in a sane state */
|
|
fd = open("/dev/null", O_RDWR);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "cannot open /dev/null\n");
|
|
err(udev, "cannot open /dev/null\n");
|
|
}
|
|
if (fd > STDIN_FILENO)
|
|
dup2(fd, STDIN_FILENO);
|
|
if (write(STDOUT_FILENO, 0, 0) < 0)
|
|
dup2(fd, STDOUT_FILENO);
|
|
if (write(STDERR_FILENO, 0, 0) < 0)
|
|
dup2(fd, STDERR_FILENO);
|
|
|
|
/* init control socket, bind() ensures, that only one udevd instance is running */
|
|
udev_ctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
|
|
if (udev_ctrl == NULL) {
|
|
fprintf(stderr, "error initializing control socket");
|
|
err(udev, "error initializing udevd socket");
|
|
rc = 1;
|
|
goto exit;
|
|
}
|
|
|
|
if (udev_ctrl_enable_receiving(udev_ctrl) < 0) {
|
|
fprintf(stderr, "error binding control socket, seems udevd is already running\n");
|
|
err(udev, "error binding control socket, seems udevd is already running\n");
|
|
rc = 1;
|
|
goto exit;
|
|
}
|
|
|
|
if (init_uevent_netlink_sock(udev) < 0) {
|
|
fprintf(stderr, "error initializing netlink socket\n");
|
|
err(udev, "error initializing netlink socket\n");
|
|
rc = 3;
|
|
goto exit;
|
|
}
|
|
|
|
retval = pipe(signal_pipe);
|
|
if (retval < 0) {
|
|
err(udev, "error getting pipes: %s\n", strerror(errno));
|
|
goto exit;
|
|
}
|
|
|
|
retval = fcntl(signal_pipe[READ_END], F_GETFL, 0);
|
|
if (retval < 0) {
|
|
err(udev, "error fcntl on read pipe: %s\n", strerror(errno));
|
|
goto exit;
|
|
}
|
|
retval = fcntl(signal_pipe[READ_END], F_SETFL, retval | O_NONBLOCK);
|
|
if (retval < 0) {
|
|
err(udev, "error fcntl on read pipe: %s\n", strerror(errno));
|
|
goto exit;
|
|
}
|
|
|
|
retval = fcntl(signal_pipe[WRITE_END], F_GETFL, 0);
|
|
if (retval < 0) {
|
|
err(udev, "error fcntl on write pipe: %s\n", strerror(errno));
|
|
goto exit;
|
|
}
|
|
retval = fcntl(signal_pipe[WRITE_END], F_SETFL, retval | O_NONBLOCK);
|
|
if (retval < 0) {
|
|
err(udev, "error fcntl on write pipe: %s\n", strerror(errno));
|
|
goto exit;
|
|
}
|
|
|
|
/* parse the rules and keep them in memory */
|
|
sysfs_init();
|
|
udev_rules_init(udev, &rules, 1);
|
|
|
|
export_initial_seqnum(udev);
|
|
|
|
if (daemonize) {
|
|
pid_t pid;
|
|
|
|
pid = fork();
|
|
switch (pid) {
|
|
case 0:
|
|
dbg(udev, "daemonized fork running\n");
|
|
break;
|
|
case -1:
|
|
err(udev, "fork of daemon failed: %s\n", strerror(errno));
|
|
rc = 4;
|
|
goto exit;
|
|
default:
|
|
dbg(udev, "child [%u] running, parent exits\n", pid);
|
|
rc = 0;
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
/* redirect std{out,err} */
|
|
if (!debug) {
|
|
dup2(fd, STDOUT_FILENO);
|
|
dup2(fd, STDERR_FILENO);
|
|
}
|
|
if (fd > STDERR_FILENO)
|
|
close(fd);
|
|
|
|
/* set scheduling priority for the daemon */
|
|
setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY);
|
|
|
|
chdir("/");
|
|
umask(022);
|
|
setsid();
|
|
|
|
/* OOM_DISABLE == -17 */
|
|
fd = open("/proc/self/oom_adj", O_RDWR);
|
|
if (fd < 0)
|
|
err(udev, "error disabling OOM: %s\n", strerror(errno));
|
|
else {
|
|
write(fd, "-17", 3);
|
|
close(fd);
|
|
}
|
|
|
|
fd = open("/dev/kmsg", O_WRONLY);
|
|
if (fd > 0) {
|
|
const char *str = "<6>udevd version " VERSION " started\n";
|
|
|
|
write(fd, str, strlen(str));
|
|
close(fd);
|
|
}
|
|
|
|
/* set signal handlers */
|
|
memset(&act, 0x00, sizeof(struct sigaction));
|
|
act.sa_handler = (void (*)(int)) sig_handler;
|
|
sigemptyset(&act.sa_mask);
|
|
act.sa_flags = SA_RESTART;
|
|
sigaction(SIGINT, &act, NULL);
|
|
sigaction(SIGTERM, &act, NULL);
|
|
sigaction(SIGCHLD, &act, NULL);
|
|
sigaction(SIGHUP, &act, NULL);
|
|
|
|
/* watch rules directory */
|
|
inotify_fd = inotify_init();
|
|
if (inotify_fd >= 0) {
|
|
if (udev_get_rules_path(udev) != NULL) {
|
|
inotify_add_watch(inotify_fd, udev_get_rules_path(udev),
|
|
IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
|
|
} else {
|
|
char filename[PATH_MAX];
|
|
|
|
inotify_add_watch(inotify_fd, UDEV_PREFIX "/lib/udev/rules.d",
|
|
IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
|
|
inotify_add_watch(inotify_fd, SYSCONFDIR "/udev/rules.d",
|
|
IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
|
|
|
|
/* watch dynamic rules directory */
|
|
strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
|
|
strlcat(filename, "/.udev/rules.d", sizeof(filename));
|
|
inotify_add_watch(inotify_fd, filename,
|
|
IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
|
|
}
|
|
} else if (errno == ENOSYS)
|
|
err(udev, "the kernel does not support inotify, udevd can't monitor rules file changes\n");
|
|
else
|
|
err(udev, "inotify_init failed: %s\n", strerror(errno));
|
|
|
|
/* maximum limit of forked childs */
|
|
value = getenv("UDEVD_MAX_CHILDS");
|
|
if (value)
|
|
max_childs = strtoul(value, NULL, 10);
|
|
else {
|
|
int memsize = mem_size_mb();
|
|
if (memsize > 0)
|
|
max_childs = 128 + (memsize / 4);
|
|
else
|
|
max_childs = UDEVD_MAX_CHILDS;
|
|
}
|
|
info(udev, "initialize max_childs to %u\n", max_childs);
|
|
|
|
/* clear environment for forked event processes */
|
|
clearenv();
|
|
|
|
/* export log_priority , as called programs may want to follow that setting */
|
|
sprintf(udev_log_env, "UDEV_LOG=%i", udev_get_log_priority(udev));
|
|
putenv(udev_log_env);
|
|
if (debug_trace)
|
|
putenv("DEBUG=1");
|
|
|
|
maxfd = udev_ctrl_get_fd(udev_ctrl);
|
|
maxfd = UDEV_MAX(maxfd, uevent_netlink_sock);
|
|
maxfd = UDEV_MAX(maxfd, signal_pipe[READ_END]);
|
|
maxfd = UDEV_MAX(maxfd, inotify_fd);
|
|
|
|
while (!udev_exit) {
|
|
struct udevd_uevent_msg *msg;
|
|
int fdcount;
|
|
|
|
FD_ZERO(&readfds);
|
|
FD_SET(signal_pipe[READ_END], &readfds);
|
|
FD_SET(udev_ctrl_get_fd(udev_ctrl), &readfds);
|
|
FD_SET(uevent_netlink_sock, &readfds);
|
|
if (inotify_fd >= 0)
|
|
FD_SET(inotify_fd, &readfds);
|
|
|
|
fdcount = select(maxfd+1, &readfds, NULL, NULL, NULL);
|
|
if (fdcount < 0) {
|
|
if (errno != EINTR)
|
|
err(udev, "error in select: %s\n", strerror(errno));
|
|
continue;
|
|
}
|
|
|
|
/* get control message */
|
|
if (FD_ISSET(udev_ctrl_get_fd(udev_ctrl), &readfds))
|
|
handle_ctrl_msg(udev_ctrl);
|
|
|
|
/* get netlink message */
|
|
if (FD_ISSET(uevent_netlink_sock, &readfds)) {
|
|
msg = get_netlink_msg(udev);
|
|
if (msg)
|
|
msg_queue_insert(msg);
|
|
}
|
|
|
|
/* received a signal, clear our notification pipe */
|
|
if (FD_ISSET(signal_pipe[READ_END], &readfds)) {
|
|
char buf[256];
|
|
|
|
read(signal_pipe[READ_END], &buf, sizeof(buf));
|
|
}
|
|
|
|
/* rules directory inotify watch */
|
|
if ((inotify_fd >= 0) && FD_ISSET(inotify_fd, &readfds)) {
|
|
int nbytes;
|
|
|
|
/* discard all possible events, we can just reload the config */
|
|
if ((ioctl(inotify_fd, FIONREAD, &nbytes) == 0) && nbytes > 0) {
|
|
char *buf;
|
|
|
|
reload_config = 1;
|
|
buf = malloc(nbytes);
|
|
if (buf == NULL) {
|
|
err(udev, "error getting buffer for inotify, disable watching\n");
|
|
close(inotify_fd);
|
|
inotify_fd = -1;
|
|
}
|
|
read(inotify_fd, buf, nbytes);
|
|
free(buf);
|
|
}
|
|
}
|
|
|
|
/* rules changed, set by inotify or a HUP signal */
|
|
if (reload_config) {
|
|
reload_config = 0;
|
|
udev_rules_cleanup(&rules);
|
|
udev_rules_init(udev, &rules, 1);
|
|
}
|
|
|
|
/* forked child has returned */
|
|
if (sigchilds_waiting) {
|
|
sigchilds_waiting = 0;
|
|
reap_sigchilds();
|
|
}
|
|
|
|
if (run_exec_q) {
|
|
run_exec_q = 0;
|
|
if (!stop_exec_q)
|
|
msg_queue_manager(udev);
|
|
}
|
|
}
|
|
rc = 0;
|
|
|
|
exit:
|
|
udev_rules_cleanup(&rules);
|
|
sysfs_cleanup();
|
|
|
|
if (signal_pipe[READ_END] >= 0)
|
|
close(signal_pipe[READ_END]);
|
|
if (signal_pipe[WRITE_END] >= 0)
|
|
close(signal_pipe[WRITE_END]);
|
|
|
|
udev_ctrl_unref(udev_ctrl);
|
|
if (inotify_fd >= 0)
|
|
close(inotify_fd);
|
|
if (uevent_netlink_sock >= 0)
|
|
close(uevent_netlink_sock);
|
|
|
|
logging_close();
|
|
return rc;
|
|
}
|