mirror of
https://github.com/systemd/systemd-stable.git
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334 lines
8.3 KiB
C
334 lines
8.3 KiB
C
/*
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* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
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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 <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "udev.h"
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static size_t devpath_to_db_path(const char *devpath, char *filename, size_t len)
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{
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size_t start;
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/* add location of db files */
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strlcpy(filename, udev_root, len);
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start = strlcat(filename, "/"DB_DIR"/", len);
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strlcat(filename, devpath, len);
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return path_encode(&filename[start], len - start);
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}
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/* reverse mapping from the device file name to the devpath */
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static int name_index(const char *devpath, const char *name, int add)
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{
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char device[PATH_SIZE];
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char filename[PATH_SIZE * 2];
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size_t start;
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int fd;
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/* directory with device name */
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strlcpy(filename, udev_root, sizeof(filename));
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start = strlcat(filename, "/"DB_NAME_INDEX_DIR"/", sizeof(filename));
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strlcat(filename, name, sizeof(filename));
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path_encode(&filename[start], sizeof(filename) - start);
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/* entry with the devpath */
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strlcpy(device, devpath, sizeof(device));
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path_encode(device, sizeof(device));
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strlcat(filename, "/", sizeof(filename));
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strlcat(filename, device, sizeof(filename));
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if (add) {
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info("creating index: '%s'", filename);
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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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} else {
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info("removing index: '%s'", filename);
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unlink(filename);
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delete_path(filename);
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}
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return 0;
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}
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int udev_db_get_devices_by_name(const char *name, struct list_head *name_list)
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{
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char dirname[PATH_MAX];
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size_t start;
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DIR *dir;
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int rc = 0;
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strlcpy(dirname, udev_root, sizeof(dirname));
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start = strlcat(dirname, "/"DB_NAME_INDEX_DIR"/", sizeof(dirname));
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strlcat(dirname, name, sizeof(dirname));
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path_encode(&dirname[start], sizeof(dirname) - start);
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dir = opendir(dirname);
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if (dir == NULL) {
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info("no index directory '%s': %s", dirname, strerror(errno));
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rc = -1;
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goto out;
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}
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info("found index directory '%s'", dirname);
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while (1) {
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struct dirent *ent;
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char device[PATH_SIZE];
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ent = readdir(dir);
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if (ent == NULL || ent->d_name[0] == '\0')
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break;
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if (ent->d_name[0] == '.')
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continue;
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strlcpy(device, ent->d_name, sizeof(device));
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path_decode(device);
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name_list_add(name_list, device, 0);
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rc++;
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}
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closedir(dir);
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out:
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return rc;
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}
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int udev_db_add_device(struct udevice *udev)
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{
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char filename[PATH_SIZE];
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if (udev->test_run)
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return 0;
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devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename));
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create_path(filename);
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unlink(filename);
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/*
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* don't waste tmpfs memory pages, if we don't have any data to store
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* create fake db-file; store the node-name in a symlink target
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*/
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if (list_empty(&udev->symlink_list) && list_empty(&udev->env_list) &&
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!udev->partitions && !udev->ignore_remove) {
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dbg("nothing interesting to store, create symlink");
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if (symlink(udev->name, filename) != 0) {
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err("unable to create db link '%s': %s", filename, strerror(errno));
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return -1;
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}
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} else {
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FILE *f;
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struct name_entry *name_loop;
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f = fopen(filename, "w");
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if (f == NULL) {
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err("unable to create db file '%s': %s", filename, strerror(errno));
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return -1;
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}
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dbg("storing data for device '%s' in '%s'", udev->dev->devpath, filename);
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fprintf(f, "N:%s\n", udev->name);
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list_for_each_entry(name_loop, &udev->symlink_list, node) {
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fprintf(f, "S:%s\n", name_loop->name);
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/* add symlink-name to index */
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name_index(udev->dev->devpath, name_loop->name, 1);
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}
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fprintf(f, "M:%u:%u\n", major(udev->devt), minor(udev->devt));
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if (udev->link_priority != 0)
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fprintf(f, "L:%u\n", udev->link_priority);
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if (udev->partitions != 0)
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fprintf(f, "A:%u\n", udev->partitions);
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if (udev->ignore_remove)
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fprintf(f, "R:%u\n", udev->ignore_remove);
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list_for_each_entry(name_loop, &udev->env_list, node)
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fprintf(f, "E:%s\n", name_loop->name);
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fclose(f);
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}
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/* add name to index */
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name_index(udev->dev->devpath, udev->name, 1);
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return 0;
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}
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int udev_db_get_device(struct udevice *udev, const char *devpath)
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{
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struct stat stats;
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char filename[PATH_SIZE];
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char line[PATH_SIZE];
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unsigned int maj, min;
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char *bufline;
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char *buf;
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size_t bufsize;
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size_t cur;
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size_t count;
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sysfs_device_set_values(udev->dev, devpath, NULL, NULL);
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devpath_to_db_path(devpath, filename, sizeof(filename));
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if (lstat(filename, &stats) != 0) {
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info("no db file to read %s: %s", filename, strerror(errno));
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return -1;
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}
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if ((stats.st_mode & S_IFMT) == S_IFLNK) {
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char target[NAME_SIZE];
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int target_len;
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info("found a symlink as db file");
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target_len = readlink(filename, target, sizeof(target));
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if (target_len > 0)
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target[target_len] = '\0';
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else {
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info("error reading db link %s: %s", filename, strerror(errno));
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return -1;
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}
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dbg("db link points to '%s'", target);
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strlcpy(udev->name, target, sizeof(udev->name));
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return 0;
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}
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if (file_map(filename, &buf, &bufsize) != 0) {
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info("error reading db file %s: %s", filename, strerror(errno));
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return -1;
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}
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cur = 0;
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while (cur < bufsize) {
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count = buf_get_line(buf, bufsize, cur);
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bufline = &buf[cur];
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cur += count+1;
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switch(bufline[0]) {
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case 'N':
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if (count > sizeof(udev->name))
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count = sizeof(udev->name);
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memcpy(udev->name, &bufline[2], count-2);
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udev->name[count-2] = '\0';
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break;
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case 'M':
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if (count > sizeof(line))
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count = sizeof(line);
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memcpy(line, &bufline[2], count-2);
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line[count-2] = '\0';
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sscanf(line, "%u:%u", &maj, &min);
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udev->devt = makedev(maj, min);
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break;
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case 'S':
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if (count > sizeof(line))
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count = sizeof(line);
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memcpy(line, &bufline[2], count-2);
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line[count-2] = '\0';
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name_list_add(&udev->symlink_list, line, 0);
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break;
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case 'L':
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if (count > sizeof(line))
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count = sizeof(line);
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memcpy(line, &bufline[2], count-2);
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line[count-2] = '\0';
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udev->link_priority = atoi(line);
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break;
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case 'A':
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if (count > sizeof(line))
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count = sizeof(line);
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memcpy(line, &bufline[2], count-2);
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line[count-2] = '\0';
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udev->partitions = atoi(line);
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break;
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case 'R':
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if (count > sizeof(line))
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count = sizeof(line);
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memcpy(line, &bufline[2], count-2);
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line[count-2] = '\0';
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udev->ignore_remove = atoi(line);
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break;
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case 'E':
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if (count > sizeof(line))
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count = sizeof(line);
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memcpy(line, &bufline[2], count-2);
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line[count-2] = '\0';
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name_list_add(&udev->env_list, line, 0);
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break;
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}
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}
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file_unmap(buf, bufsize);
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if (udev->name[0] == '\0')
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return -1;
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return 0;
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}
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int udev_db_delete_device(struct udevice *udev)
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{
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char filename[PATH_SIZE];
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struct name_entry *name_loop;
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if (udev->test_run)
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return 0;
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devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename));
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unlink(filename);
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name_index(udev->dev->devpath, udev->name, 0);
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list_for_each_entry(name_loop, &udev->symlink_list, node)
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name_index(udev->dev->devpath, name_loop->name, 0);
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return 0;
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}
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int udev_db_get_all_entries(struct list_head *name_list)
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{
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char dbpath[PATH_MAX];
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DIR *dir;
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strlcpy(dbpath, udev_root, sizeof(dbpath));
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strlcat(dbpath, "/"DB_DIR, sizeof(dbpath));
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dir = opendir(dbpath);
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if (dir == NULL) {
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info("no udev_db available '%s': %s", dbpath, strerror(errno));
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return -1;
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}
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while (1) {
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struct dirent *ent;
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char device[PATH_SIZE];
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ent = readdir(dir);
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if (ent == NULL || ent->d_name[0] == '\0')
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break;
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if (ent->d_name[0] == '.')
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continue;
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strlcpy(device, ent->d_name, sizeof(device));
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path_decode(device);
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name_list_add(name_list, device, 1);
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dbg("added '%s'", device);
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}
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closedir(dir);
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return 0;
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}
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