mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-10-31 07:51:08 +03:00
1251 lines
29 KiB
C
1251 lines
29 KiB
C
/*
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* Copyright (C) 2004-2006 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 it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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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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#include "udev.h"
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#include "udev_rules.h"
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#include "udevd.h"
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#include "udev_selinux.h"
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static int debug_trace;
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static int verbose;
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static struct udev_rules rules;
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static int udevd_sock = -1;
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static int uevent_netlink_sock = -1;
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static int inotify_fd = -1;
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static pid_t sid;
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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 int max_childs_running;
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static char udev_log[32];
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static LIST_HEAD(exec_list);
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static LIST_HEAD(running_list);
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#ifdef USE_LOG
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void log_message(int priority, const char *format, ...)
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{
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va_list args;
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if (priority > udev_log_priority)
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return;
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va_start(args, format);
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vsyslog(priority, format, args);
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va_end(args);
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if (verbose) {
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va_start(args, format);
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vprintf(format, args);
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va_end(args);
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printf("\n");
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}
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}
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#endif
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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 *udev;
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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_ALARM_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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udev = udev_device_init(NULL);
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if (udev == NULL)
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return -1;
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strlcpy(udev->action, msg->action, sizeof(udev->action));
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sysfs_device_set_values(udev->dev, msg->devpath, msg->subsystem, msg->driver);
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udev->devt = msg->devt;
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retval = udev_device_event(&rules, udev);
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/* run programs collected by RUN-key*/
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if (retval == 0 && !udev->ignore_device && udev_run) {
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struct name_entry *name_loop;
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dbg("executing run list");
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list_for_each_entry(name_loop, &udev->run_list, node) {
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if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0)
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pass_env_to_socket(&name_loop->name[strlen("socket:")], udev->dev->devpath, udev->action);
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else {
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char program[PATH_SIZE];
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strlcpy(program, name_loop->name, sizeof(program));
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udev_rules_apply_format(udev, program, sizeof(program));
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if (run_program(program, udev->dev->subsystem, NULL, 0, NULL,
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(udev_log_priority >= LOG_INFO)))
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retval = -1;
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}
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}
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}
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udev_device_cleanup(udev);
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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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struct udevd_uevent_msg *loop_msg;
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int fd;
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/* add location of queue files */
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strlcpy(filename, udev_root, sizeof(filename));
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strlcat(filename, "/", sizeof(filename));
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start = strlcat(filename, EVENT_QUEUE_DIR"/", sizeof(filename));
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strlcat(filename, msg->devpath, sizeof(filename));
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path_encode(&filename[start], sizeof(filename) - start);
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/* add location of failed files */
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strlcpy(filename_failed, udev_root, sizeof(filename_failed));
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strlcat(filename_failed, "/", sizeof(filename_failed));
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start = strlcat(filename_failed, EVENT_FAILED_DIR"/", 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) - 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(filename_failed);
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create_path(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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close(fd);
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return;
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case EVENT_FINISHED:
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case EVENT_FAILED:
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unlink(filename_failed);
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delete_path(filename_failed);
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/* don't remove, if events for the same path are still pending */
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list_for_each_entry(loop_msg, &running_list, node)
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if (loop_msg->devpath && strcmp(loop_msg->devpath, msg->devpath) == 0)
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return;
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list_for_each_entry(loop_msg, &exec_list, node)
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if (loop_msg->devpath && strcmp(loop_msg->devpath, msg->devpath) == 0)
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return;
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/* move failed events to the failed directory */
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if (state == EVENT_FAILED) {
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create_path(filename_failed);
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rename(filename, filename_failed);
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} else {
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unlink(filename);
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}
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/* clean up the queue directory */
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delete_path(filename);
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return;
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}
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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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close(udevd_sock);
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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("seq %llu finished", msg->seqnum);
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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("fork of child failed: %s", 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("seq %llu forked, pid [%d], '%s' '%s', %ld seconds old",
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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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strlcpy(filename, udev_root, sizeof(filename));
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strlcat(filename, "/" EVENT_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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export_event_state(msg, EVENT_QUEUED);
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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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int f;
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char buf[8192];
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long int len;
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const char *pos;
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long int memsize;
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f = open("/proc/meminfo", O_RDONLY);
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if (f == -1)
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return -1;
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len = read(f, buf, sizeof(buf)-1);
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close(f);
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if (len <= 0)
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return -1;
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buf[len] = '\0';
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pos = strstr(buf, "MemTotal: ");
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if (pos == NULL)
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return -1;
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if (sscanf(pos, "MemTotal: %ld kB", &memsize) != 1)
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return -1;
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return memsize / 1024;
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}
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static int cpu_count(void)
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{
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int f;
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char buf[65536];
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int len;
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const char *pos;
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int count = 0;
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f = open("/proc/stat", O_RDONLY);
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if (f == -1)
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return -1;
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len = read(f, buf, sizeof(buf)-1);
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close(f);
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if (len <= 0)
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return -1;
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buf[len] = '\0';
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pos = strstr(buf, "cpu");
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if (pos == NULL)
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return -1;
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while (pos != NULL) {
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if (strncmp(pos, "cpu", 3) == 0 &&isdigit(pos[3]))
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count++;
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pos = strstr(&pos[3], "cpu");
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}
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if (count == 0)
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return -1;
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return count;
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}
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static int running_processes(void)
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{
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int f;
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char buf[32768];
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int len;
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int running;
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const char *pos;
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f = open("/proc/stat", O_RDONLY);
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if (f == -1)
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return -1;
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len = read(f, buf, sizeof(buf)-1);
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close(f);
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if (len <= 0)
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return -1;
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buf[len] = '\0';
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pos = strstr(buf, "procs_running ");
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if (pos == NULL)
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return -1;
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if (sscanf(pos, "procs_running %u", &running) != 1)
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return -1;
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return running;
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}
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/* return the number of process es in our session, count only until limit */
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static int running_processes_in_session(pid_t session, int limit)
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{
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DIR *dir;
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struct dirent *dent;
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int running = 0;
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dir = opendir("/proc");
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if (!dir)
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return -1;
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/* read process info from /proc */
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for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
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int f;
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char procdir[64];
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char line[256];
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const char *pos;
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char state;
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pid_t ppid, pgrp, sess;
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int len;
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if (!isdigit(dent->d_name[0]))
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continue;
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snprintf(procdir, sizeof(procdir), "/proc/%s/stat", dent->d_name);
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procdir[sizeof(procdir)-1] = '\0';
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f = open(procdir, O_RDONLY);
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if (f == -1)
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continue;
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len = read(f, line, sizeof(line)-1);
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close(f);
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if (len <= 0)
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continue;
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else
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line[len] = '\0';
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/* skip ugly program name */
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pos = strrchr(line, ')') + 2;
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if (pos == NULL)
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continue;
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if (sscanf(pos, "%c %d %d %d ", &state, &ppid, &pgrp, &sess) != 4)
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continue;
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/* count only processes in our session */
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if (sess != session)
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continue;
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/* count only running, no sleeping processes */
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if (state != 'R')
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continue;
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running++;
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if (limit > 0 && running >= limit)
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break;
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}
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closedir(dir);
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return running;
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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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/* returns still running task for the same device, its parent or its physical device */
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static int running_with_devpath(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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list_for_each_entry(loop_msg, &running_list, node) {
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if (limit && childs_count++ > limit) {
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dbg("%llu, maximum number (%i) of child reached", msg->seqnum, childs_count);
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return 1;
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}
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/* return running parent/child device event */
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if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) {
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dbg("%llu, child device event still running %llu (%s)",
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msg->seqnum, loop_msg->seqnum, loop_msg->devpath);
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return 2;
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}
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/* return running physical device event */
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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("%llu, physical device event still running %llu (%s)",
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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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}
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return 0;
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}
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|
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/* exec queue management routine executes the events and serializes events in the same sequence */
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static void msg_queue_manager(void)
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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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int running;
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if (list_empty(&exec_list))
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return;
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running = running_processes();
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dbg("%d processes runnning on system", running);
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if (running < 0)
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running = max_childs_running;
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list_for_each_entry_safe(loop_msg, tmp_msg, &exec_list, node) {
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/* check running processes in our session and possibly throttle */
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if (running >= max_childs_running) {
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running = running_processes_in_session(sid, max_childs_running+10);
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dbg("at least %d processes running in session", running);
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if (running >= max_childs_running) {
|
|
dbg("delay seq %llu, too many processes already running", loop_msg->seqnum);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* don't run two processes for the same devpath and wait for the parent*/
|
|
if (running_with_devpath(loop_msg, max_childs)) {
|
|
dbg("delay seq %llu (%s)", loop_msg->seqnum, loop_msg->devpath);
|
|
continue;
|
|
}
|
|
|
|
/* move event to run list */
|
|
list_move_tail(&loop_msg->node, &running_list);
|
|
udev_event_run(loop_msg);
|
|
running++;
|
|
dbg("moved seq %llu to running list", loop_msg->seqnum);
|
|
}
|
|
}
|
|
|
|
static struct udevd_uevent_msg *get_msg_from_envbuf(const char *buf, int buf_size)
|
|
{
|
|
int bufpos;
|
|
int i;
|
|
struct udevd_uevent_msg *msg;
|
|
char *physdevdriver_key = NULL;
|
|
int maj = 0;
|
|
int min = 0;
|
|
|
|
msg = malloc(sizeof(struct udevd_uevent_msg) + buf_size);
|
|
if (msg == NULL)
|
|
return NULL;
|
|
memset(msg, 0x00, sizeof(struct udevd_uevent_msg) + buf_size);
|
|
|
|
/* copy environment buffer and reconstruct envp */
|
|
memcpy(msg->envbuf, buf, buf_size);
|
|
bufpos = 0;
|
|
for (i = 0; (bufpos < buf_size) && (i < UEVENT_NUM_ENVP-2); i++) {
|
|
int keylen;
|
|
char *key;
|
|
|
|
key = &msg->envbuf[bufpos];
|
|
keylen = strlen(key);
|
|
msg->envp[i] = key;
|
|
bufpos += keylen + 1;
|
|
dbg("add '%s' to msg.envp[%i]", 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, "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("DEVPATH or ACTION missing, ignore message");
|
|
free(msg);
|
|
return NULL;
|
|
}
|
|
return msg;
|
|
}
|
|
|
|
/* receive the udevd message from userspace */
|
|
static void get_ctrl_msg(void)
|
|
{
|
|
struct udevd_ctrl_msg ctrl_msg;
|
|
ssize_t size;
|
|
struct msghdr smsg;
|
|
struct cmsghdr *cmsg;
|
|
struct iovec iov;
|
|
struct ucred *cred;
|
|
char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
|
|
int *intval;
|
|
|
|
memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
|
|
iov.iov_base = &ctrl_msg;
|
|
iov.iov_len = sizeof(struct udevd_ctrl_msg);
|
|
|
|
memset(&smsg, 0x00, sizeof(struct msghdr));
|
|
smsg.msg_iov = &iov;
|
|
smsg.msg_iovlen = 1;
|
|
smsg.msg_control = cred_msg;
|
|
smsg.msg_controllen = sizeof(cred_msg);
|
|
|
|
size = recvmsg(udevd_sock, &smsg, 0);
|
|
if (size < 0) {
|
|
if (errno != EINTR)
|
|
err("unable to receive user udevd message: %s", strerror(errno));
|
|
return;
|
|
}
|
|
cmsg = CMSG_FIRSTHDR(&smsg);
|
|
cred = (struct ucred *) CMSG_DATA(cmsg);
|
|
|
|
if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
|
|
err("no sender credentials received, message ignored");
|
|
return;
|
|
}
|
|
|
|
if (cred->uid != 0) {
|
|
err("sender uid=%i, message ignored", cred->uid);
|
|
return;
|
|
}
|
|
|
|
if (strncmp(ctrl_msg.magic, UDEVD_CTRL_MAGIC, sizeof(UDEVD_CTRL_MAGIC)) != 0 ) {
|
|
err("message magic '%s' doesn't match, ignore it", ctrl_msg.magic);
|
|
return;
|
|
}
|
|
|
|
switch (ctrl_msg.type) {
|
|
case UDEVD_CTRL_STOP_EXEC_QUEUE:
|
|
info("udevd message (STOP_EXEC_QUEUE) received");
|
|
stop_exec_q = 1;
|
|
break;
|
|
case UDEVD_CTRL_START_EXEC_QUEUE:
|
|
info("udevd message (START_EXEC_QUEUE) received");
|
|
stop_exec_q = 0;
|
|
msg_queue_manager();
|
|
break;
|
|
case UDEVD_CTRL_SET_LOG_LEVEL:
|
|
intval = (int *) ctrl_msg.buf;
|
|
info("udevd message (SET_LOG_PRIORITY) received, udev_log_priority=%i", *intval);
|
|
udev_log_priority = *intval;
|
|
sprintf(udev_log, "UDEV_LOG=%i", udev_log_priority);
|
|
putenv(udev_log);
|
|
break;
|
|
case UDEVD_CTRL_SET_MAX_CHILDS:
|
|
intval = (int *) ctrl_msg.buf;
|
|
info("udevd message (UDEVD_SET_MAX_CHILDS) received, max_childs=%i", *intval);
|
|
max_childs = *intval;
|
|
break;
|
|
case UDEVD_CTRL_SET_MAX_CHILDS_RUNNING:
|
|
intval = (int *) ctrl_msg.buf;
|
|
info("udevd message (UDEVD_SET_MAX_CHILDS_RUNNING) received, max_childs=%i", *intval);
|
|
max_childs_running = *intval;
|
|
break;
|
|
case UDEVD_CTRL_RELOAD_RULES:
|
|
info("udevd message (RELOAD_RULES) received");
|
|
reload_config = 1;
|
|
break;
|
|
default:
|
|
err("unknown control message type");
|
|
}
|
|
}
|
|
|
|
/* receive the kernel user event message and do some sanity checks */
|
|
static struct udevd_uevent_msg *get_netlink_msg(void)
|
|
{
|
|
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("unable to receive kernel netlink message: %s", strerror(errno));
|
|
return NULL;
|
|
}
|
|
|
|
if ((size_t)size > sizeof(buffer)-1)
|
|
size = sizeof(buffer)-1;
|
|
buffer[size] = '\0';
|
|
dbg("uevent_size=%zi", size);
|
|
|
|
/* start of event payload */
|
|
bufpos = strlen(buffer)+1;
|
|
msg = get_msg_from_envbuf(&buffer[bufpos], size-bufpos);
|
|
if (msg == NULL)
|
|
return NULL;
|
|
|
|
/* validate message */
|
|
pos = strchr(buffer, '@');
|
|
if (pos == NULL) {
|
|
err("invalid uevent '%s'", buffer);
|
|
free(msg);
|
|
return NULL;
|
|
}
|
|
pos[0] = '\0';
|
|
|
|
if (msg->action == NULL) {
|
|
info("no ACTION in payload found, skip event '%s'", buffer);
|
|
free(msg);
|
|
return NULL;
|
|
}
|
|
|
|
if (strcmp(msg->action, buffer) != 0) {
|
|
err("ACTION in payload does not match uevent, skip event '%s'", 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("seq %llu, pid [%d] exit with %i, %ld seconds old", 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_udevd_socket(void)
|
|
{
|
|
struct sockaddr_un saddr;
|
|
socklen_t addrlen;
|
|
const int feature_on = 1;
|
|
int retval;
|
|
|
|
memset(&saddr, 0x00, sizeof(saddr));
|
|
saddr.sun_family = AF_LOCAL;
|
|
/* use abstract namespace for socket path */
|
|
strcpy(&saddr.sun_path[1], UDEVD_CTRL_SOCK_PATH);
|
|
addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
|
|
|
|
udevd_sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
|
|
if (udevd_sock == -1) {
|
|
err("error getting socket: %s", strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
/* the bind takes care of ensuring only one copy running */
|
|
retval = bind(udevd_sock, (struct sockaddr *) &saddr, addrlen);
|
|
if (retval < 0) {
|
|
err("bind failed: %s", strerror(errno));
|
|
close(udevd_sock);
|
|
udevd_sock = -1;
|
|
return -1;
|
|
}
|
|
|
|
/* enable receiving of the sender credentials */
|
|
setsockopt(udevd_sock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int init_uevent_netlink_sock(void)
|
|
{
|
|
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("error getting socket: %s", 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("bind failed: %s", strerror(errno));
|
|
close(uevent_netlink_sock);
|
|
uevent_netlink_sock = -1;
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void export_initial_seqnum(void)
|
|
{
|
|
char filename[PATH_SIZE];
|
|
int fd;
|
|
char seqnum[32];
|
|
ssize_t len = 0;
|
|
|
|
strlcpy(filename, sysfs_path, 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_root, sizeof(filename));
|
|
strlcat(filename, "/" EVENT_SEQNUM, sizeof(filename));
|
|
create_path(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[], char *envp[])
|
|
{
|
|
int retval;
|
|
int fd;
|
|
struct sigaction act;
|
|
fd_set readfds;
|
|
const char *value;
|
|
int daemonize = 0;
|
|
int option;
|
|
static const struct option options[] = {
|
|
{ "daemon", 0, NULL, 'd' },
|
|
{ "debug-trace", 0, NULL, 't' },
|
|
{ "verbose", 0, NULL, 'v' },
|
|
{ "help", 0, NULL, 'h' },
|
|
{ "version", 0, NULL, 'V' },
|
|
{}
|
|
};
|
|
int rc = 1;
|
|
int maxfd;
|
|
|
|
logging_init("udevd");
|
|
udev_config_init();
|
|
selinux_init();
|
|
dbg("version %s", UDEV_VERSION);
|
|
|
|
/* parse commandline options */
|
|
while (1) {
|
|
option = getopt_long(argc, argv, "dtvhV", options, NULL);
|
|
if (option == -1)
|
|
break;
|
|
|
|
switch (option) {
|
|
case 'd':
|
|
daemonize = 1;
|
|
break;
|
|
case 't':
|
|
debug_trace = 1;
|
|
break;
|
|
case 'v':
|
|
verbose = 1;
|
|
if (udev_log_priority < LOG_INFO)
|
|
udev_log_priority = LOG_INFO;
|
|
break;
|
|
case 'h':
|
|
printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--verbose] [--version]\n");
|
|
goto exit;
|
|
case 'V':
|
|
printf("%s\n", UDEV_VERSION);
|
|
goto exit;
|
|
default:
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
if (getuid() != 0) {
|
|
fprintf(stderr, "root privileges required\n");
|
|
err("root privileges required");
|
|
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("cannot open /dev/null");
|
|
}
|
|
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 sockets to receive events */
|
|
if (init_udevd_socket() < 0) {
|
|
if (errno == EADDRINUSE) {
|
|
fprintf(stderr, "another udev daemon already running\n");
|
|
err("another udev daemon already running");
|
|
rc = 1;
|
|
} else {
|
|
fprintf(stderr, "error initializing udevd socket\n");
|
|
err("error initializing udevd socket");
|
|
rc = 2;
|
|
}
|
|
goto exit;
|
|
}
|
|
|
|
if (init_uevent_netlink_sock() < 0) {
|
|
fprintf(stderr, "error initializing netlink socket\n");
|
|
err("error initializing netlink socket");
|
|
rc = 3;
|
|
goto exit;
|
|
}
|
|
|
|
/* setup signal handler pipe */
|
|
retval = pipe(signal_pipe);
|
|
if (retval < 0) {
|
|
err("error getting pipes: %s", strerror(errno));
|
|
goto exit;
|
|
}
|
|
|
|
retval = fcntl(signal_pipe[READ_END], F_GETFL, 0);
|
|
if (retval < 0) {
|
|
err("error fcntl on read pipe: %s", strerror(errno));
|
|
goto exit;
|
|
}
|
|
retval = fcntl(signal_pipe[READ_END], F_SETFL, retval | O_NONBLOCK);
|
|
if (retval < 0) {
|
|
err("error fcntl on read pipe: %s", strerror(errno));
|
|
goto exit;
|
|
}
|
|
|
|
retval = fcntl(signal_pipe[WRITE_END], F_GETFL, 0);
|
|
if (retval < 0) {
|
|
err("error fcntl on write pipe: %s", strerror(errno));
|
|
goto exit;
|
|
}
|
|
retval = fcntl(signal_pipe[WRITE_END], F_SETFL, retval | O_NONBLOCK);
|
|
if (retval < 0) {
|
|
err("error fcntl on write pipe: %s", strerror(errno));
|
|
goto exit;
|
|
}
|
|
|
|
/* parse the rules and keep them in memory */
|
|
sysfs_init();
|
|
udev_rules_init(&rules, 1);
|
|
|
|
export_initial_seqnum();
|
|
|
|
if (daemonize) {
|
|
pid_t pid;
|
|
|
|
pid = fork();
|
|
switch (pid) {
|
|
case 0:
|
|
dbg("daemonized fork running");
|
|
break;
|
|
case -1:
|
|
err("fork of daemon failed: %s", strerror(errno));
|
|
rc = 4;
|
|
goto exit;
|
|
default:
|
|
dbg("child [%u] running, parent exits", pid);
|
|
rc = 0;
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
/* redirect std{out,err} fd's */
|
|
if (!verbose)
|
|
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);
|
|
|
|
/* become session leader */
|
|
sid = setsid();
|
|
dbg("our session is %d", sid);
|
|
|
|
/* OOM_DISABLE == -17 */
|
|
fd = open("/proc/self/oom_adj", O_RDWR);
|
|
if (fd < 0)
|
|
err("error disabling OOM: %s", strerror(errno));
|
|
else {
|
|
write(fd, "-17", 3);
|
|
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)
|
|
inotify_add_watch(inotify_fd, udev_rules_dir, IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE);
|
|
else if (errno == ENOSYS)
|
|
err("the kernel does not support inotify, udevd can't monitor configuration file changes");
|
|
else
|
|
err("inotify_init failed: %s", 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("initialize max_childs to %u", max_childs);
|
|
|
|
/* start to throttle forking if maximum number of _running_ childs is reached */
|
|
value = getenv("UDEVD_MAX_CHILDS_RUNNING");
|
|
if (value)
|
|
max_childs_running = strtoull(value, NULL, 10);
|
|
else {
|
|
int cpus = cpu_count();
|
|
if (cpus > 0)
|
|
max_childs_running = 8 + (8 * cpus);
|
|
else
|
|
max_childs_running = UDEVD_MAX_CHILDS_RUNNING;
|
|
}
|
|
info("initialize max_childs_running to %u", max_childs_running);
|
|
|
|
/* clear environment for forked event processes */
|
|
clearenv();
|
|
|
|
/* export log_priority , as called programs may want to follow that setting */
|
|
sprintf(udev_log, "UDEV_LOG=%i", udev_log_priority);
|
|
putenv(udev_log);
|
|
if (debug_trace)
|
|
putenv("DEBUG=1");
|
|
|
|
maxfd = udevd_sock;
|
|
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(udevd_sock, &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("error in select: %s", strerror(errno));
|
|
continue;
|
|
}
|
|
|
|
/* get control message */
|
|
if (FD_ISSET(udevd_sock, &readfds))
|
|
get_ctrl_msg();
|
|
|
|
/* get netlink message */
|
|
if (FD_ISSET(uevent_netlink_sock, &readfds)) {
|
|
msg = get_netlink_msg();
|
|
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) {
|
|
char *buf;
|
|
|
|
reload_config = 1;
|
|
buf = malloc(nbytes);
|
|
if (!buf) {
|
|
err("error getting buffer for inotify, disable watching");
|
|
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(&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();
|
|
}
|
|
}
|
|
rc = 0;
|
|
|
|
exit:
|
|
udev_rules_cleanup(&rules);
|
|
sysfs_cleanup();
|
|
selinux_exit();
|
|
|
|
if (signal_pipe[READ_END] >= 0)
|
|
close(signal_pipe[READ_END]);
|
|
if (signal_pipe[WRITE_END] >= 0)
|
|
close(signal_pipe[WRITE_END]);
|
|
|
|
if (udevd_sock >= 0)
|
|
close(udevd_sock);
|
|
if (inotify_fd >= 0)
|
|
close(inotify_fd);
|
|
if (uevent_netlink_sock >= 0)
|
|
close(uevent_netlink_sock);
|
|
|
|
logging_close();
|
|
|
|
return rc;
|
|
}
|