diff options
Diffstat (limited to 'udev/udev_db.c')
| -rw-r--r-- | udev/udev_db.c | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/udev/udev_db.c b/udev/udev_db.c new file mode 100644 index 0000000000..3348c9a02c --- /dev/null +++ b/udev/udev_db.c @@ -0,0 +1,331 @@ +/* + * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> + * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <stddef.h> +#include <unistd.h> +#include <fcntl.h> +#include <string.h> +#include <errno.h> +#include <dirent.h> +#include <sys/stat.h> +#include <sys/types.h> + +#include "udev.h" +#include "udev_selinux.h" + + +static size_t devpath_to_db_path(const char *devpath, char *filename, size_t len) +{ + size_t start; + + /* translate to location of db file */ + strlcpy(filename, udev_root, len); + start = strlcat(filename, "/"DB_DIR"/", len); + strlcat(filename, devpath, len); + return path_encode(&filename[start], len - start); +} + +/* reverse mapping from the device file name to the devpath */ +static int name_index(const char *devpath, const char *name, int add) +{ + char device[PATH_SIZE]; + char filename[PATH_SIZE * 2]; + size_t start; + int fd; + + /* directory with device name */ + strlcpy(filename, udev_root, sizeof(filename)); + start = strlcat(filename, "/"DB_NAME_INDEX_DIR"/", sizeof(filename)); + strlcat(filename, name, sizeof(filename)); + path_encode(&filename[start], sizeof(filename) - start); + /* entry with the devpath */ + strlcpy(device, devpath, sizeof(device)); + path_encode(device, sizeof(device)); + strlcat(filename, "/", sizeof(filename)); + strlcat(filename, device, sizeof(filename)); + + if (add) { + info("creating index: '%s'\n", filename); + create_path(filename); + fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 0644); + if (fd > 0) + close(fd); + } else { + info("removing index: '%s'\n", filename); + unlink(filename); + delete_path(filename); + } + return 0; +} + +int udev_db_get_devices_by_name(const char *name, struct list_head *name_list) +{ + char dirname[PATH_MAX]; + size_t start; + DIR *dir; + int rc = 0; + + strlcpy(dirname, udev_root, sizeof(dirname)); + start = strlcat(dirname, "/"DB_NAME_INDEX_DIR"/", sizeof(dirname)); + strlcat(dirname, name, sizeof(dirname)); + path_encode(&dirname[start], sizeof(dirname) - start); + + dir = opendir(dirname); + if (dir == NULL) { + info("no index directory '%s': %s\n", dirname, strerror(errno)); + rc = -1; + goto out; + } + + info("found index directory '%s'\n", dirname); + while (1) { + struct dirent *ent; + char device[PATH_SIZE]; + + ent = readdir(dir); + if (ent == NULL || ent->d_name[0] == '\0') + break; + if (ent->d_name[0] == '.') + continue; + + strlcpy(device, ent->d_name, sizeof(device)); + path_decode(device); + name_list_add(name_list, device, 0); + rc++; + } + closedir(dir); +out: + return rc; +} + +int udev_db_rename(const char *devpath_old, const char *devpath) +{ + char filename[PATH_SIZE]; + char filename_old[PATH_SIZE]; + + devpath_to_db_path(devpath_old, filename_old, sizeof(filename_old)); + devpath_to_db_path(devpath, filename, sizeof(filename)); + return rename(filename_old, filename); +} + +int udev_db_add_device(struct udevice *udev) +{ + char filename[PATH_SIZE]; + + if (udev->test_run) + return 0; + + devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename)); + create_path(filename); + unlink(filename); + + /* + * don't waste tmpfs memory pages, if we don't have any data to store + * create fake db-file; store the node-name in a symlink target + */ + if (list_empty(&udev->symlink_list) && list_empty(&udev->env_list) && + !udev->partitions && !udev->ignore_remove) { + int ret; + dbg("nothing interesting to store, create symlink\n"); + selinux_setfscreatecon(filename, NULL, S_IFLNK); + ret = symlink(udev->name, filename); + selinux_resetfscreatecon(); + if (ret != 0) { + err("unable to create db link '%s': %s\n", filename, strerror(errno)); + return -1; + } + } else { + FILE *f; + struct name_entry *name_loop; + + f = fopen(filename, "w"); + if (f == NULL) { + err("unable to create db file '%s': %s\n", filename, strerror(errno)); + return -1; + } + dbg("storing data for device '%s' in '%s'\n", udev->dev->devpath, filename); + + fprintf(f, "N:%s\n", udev->name); + list_for_each_entry(name_loop, &udev->symlink_list, node) { + fprintf(f, "S:%s\n", name_loop->name); + /* add symlink-name to index */ + name_index(udev->dev->devpath, name_loop->name, 1); + } + fprintf(f, "M:%u:%u\n", major(udev->devt), minor(udev->devt)); + if (udev->link_priority != 0) + fprintf(f, "L:%u\n", udev->link_priority); + if (udev->event_timeout >= 0) + fprintf(f, "T:%u\n", udev->event_timeout); + if (udev->partitions != 0) + fprintf(f, "A:%u\n", udev->partitions); + if (udev->ignore_remove) + fprintf(f, "R:%u\n", udev->ignore_remove); + list_for_each_entry(name_loop, &udev->env_list, node) + fprintf(f, "E:%s\n", name_loop->name); + fclose(f); + } + + /* add name to index */ + name_index(udev->dev->devpath, udev->name, 1); + + return 0; +} + +int udev_db_get_device(struct udevice *udev, const char *devpath) +{ + struct stat stats; + char filename[PATH_SIZE]; + char line[PATH_SIZE]; + unsigned int maj, min; + char *bufline; + char *buf; + size_t bufsize; + size_t cur; + size_t count; + + sysfs_device_set_values(udev->dev, devpath, NULL, NULL); + devpath_to_db_path(devpath, filename, sizeof(filename)); + + if (lstat(filename, &stats) != 0) { + info("no db file to read %s: %s\n", filename, strerror(errno)); + return -1; + } + if ((stats.st_mode & S_IFMT) == S_IFLNK) { + char target[NAME_SIZE]; + int target_len; + + info("found a symlink as db file\n"); + target_len = readlink(filename, target, sizeof(target)); + if (target_len > 0) + target[target_len] = '\0'; + else { + info("error reading db link %s: %s\n", filename, strerror(errno)); + return -1; + } + dbg("db link points to '%s'\n", target); + strlcpy(udev->name, target, sizeof(udev->name)); + return 0; + } + + if (file_map(filename, &buf, &bufsize) != 0) { + info("error reading db file %s: %s\n", filename, strerror(errno)); + return -1; + } + + cur = 0; + while (cur < bufsize) { + count = buf_get_line(buf, bufsize, cur); + bufline = &buf[cur]; + cur += count+1; + + if (count > sizeof(line)) + count = sizeof(line); + memcpy(line, &bufline[2], count-2); + line[count-2] = '\0'; + + switch(bufline[0]) { + case 'N': + strlcpy(udev->name, line, sizeof(udev->name)); + break; + case 'M': + sscanf(line, "%u:%u", &maj, &min); + udev->devt = makedev(maj, min); + break; + case 'S': + name_list_add(&udev->symlink_list, line, 0); + break; + case 'L': + udev->link_priority = atoi(line); + break; + case 'T': + udev->event_timeout = atoi(line); + break; + case 'A': + udev->partitions = atoi(line); + break; + case 'R': + udev->ignore_remove = atoi(line); + break; + case 'E': + name_list_add(&udev->env_list, line, 0); + break; + } + } + file_unmap(buf, bufsize); + + if (udev->name[0] == '\0') + return -1; + + return 0; +} + +int udev_db_delete_device(struct udevice *udev) +{ + char filename[PATH_SIZE]; + struct name_entry *name_loop; + + if (udev->test_run) + return 0; + + devpath_to_db_path(udev->dev->devpath, filename, sizeof(filename)); + unlink(filename); + + name_index(udev->dev->devpath, udev->name, 0); + list_for_each_entry(name_loop, &udev->symlink_list, node) + name_index(udev->dev->devpath, name_loop->name, 0); + + return 0; +} + +int udev_db_get_all_entries(struct list_head *name_list) +{ + char dbpath[PATH_MAX]; + DIR *dir; + + strlcpy(dbpath, udev_root, sizeof(dbpath)); + strlcat(dbpath, "/"DB_DIR, sizeof(dbpath)); + dir = opendir(dbpath); + if (dir == NULL) { + info("no udev_db available '%s': %s\n", dbpath, strerror(errno)); + return -1; + } + + while (1) { + struct dirent *ent; + char device[PATH_SIZE]; + + ent = readdir(dir); + if (ent == NULL || ent->d_name[0] == '\0') + break; + if (ent->d_name[0] == '.') + continue; + + strlcpy(device, ent->d_name, sizeof(device)); + path_decode(device); + name_list_add(name_list, device, 1); + dbg("added '%s'\n", device); + } + + closedir(dir); + return 0; +} |